nsswitch/pam_winbind.c

   1 /* pam_winbind module
   2
   3    Copyright Andrew Tridgell <tridge@samba.org> 2000
   4    Copyright Tim Potter <tpot@samba.org> 2000
   5    Copyright Andrew Bartlett <abartlet@samba.org> 2002
   6    Copyright Guenther Deschner <gd@samba.org> 2005-2008
   7
   8    largely based on pam_userdb by Cristian Gafton <gafton@redhat.com> also
   9    contains large slabs of code from pam_unix by Elliot Lee
  10    <sopwith@redhat.com> (see copyright below for full details)
  11 */
  12
  13 #include "pam_winbind.h"
  14 #define CONST_DISCARD(type,ptr) ((type)(void *)ptr)
  15
  16
  17 static int wbc_error_to_pam_error(wbcErr status)
  18 {
  19         switch (status) {
  20                 case WBC_ERR_SUCCESS:
  21                         return PAM_SUCCESS;
  22                 case WBC_ERR_NOT_IMPLEMENTED:
  23                         return PAM_SERVICE_ERR;
  24                 case WBC_ERR_UNKNOWN_FAILURE:
  25                         break;
  26                 case WBC_ERR_NO_MEMORY:
  27                         return PAM_BUF_ERR;
  28                 case WBC_ERR_INVALID_SID:
  29                 case WBC_ERR_INVALID_PARAM:
  30                         break;
  31                 case WBC_ERR_WINBIND_NOT_AVAILABLE:
  32                         return PAM_AUTHINFO_UNAVAIL;
  33                 case WBC_ERR_DOMAIN_NOT_FOUND:
  34                         return PAM_AUTHINFO_UNAVAIL;
  35                 case WBC_ERR_INVALID_RESPONSE:
  36                         return PAM_BUF_ERR;
  37                 case WBC_ERR_NSS_ERROR:
  38                         return PAM_USER_UNKNOWN;
  39                 case WBC_ERR_AUTH_ERROR:
  40                         return PAM_AUTH_ERR;
  41                 case WBC_ERR_UNKNOWN_USER:
  42                         return PAM_USER_UNKNOWN;
  43                 case WBC_ERR_UNKNOWN_GROUP:
  44                         return PAM_USER_UNKNOWN;
  45                 case WBC_ERR_PWD_CHANGE_FAILED:
  46                         break;
  47         }
  48
  49         /* be paranoid */
  50         return PAM_AUTH_ERR;
  51 }
  52
  53 static const char *_pam_error_code_str(int err)
  54 {
  55         switch (err) {
  56                 case PAM_SUCCESS:
  57                         return "PAM_SUCCESS";
  58                 case PAM_OPEN_ERR:
  59                         return "PAM_OPEN_ERR";
  60                 case PAM_SYMBOL_ERR:
  61                         return "PAM_SYMBOL_ERR";
  62                 case PAM_SERVICE_ERR:
  63                         return "PAM_SERVICE_ERR";
  64                 case PAM_SYSTEM_ERR:
  65                         return "PAM_SYSTEM_ERR";
  66                 case PAM_BUF_ERR:
  67                         return "PAM_BUF_ERR";
  68                 case PAM_PERM_DENIED:
  69                         return "PAM_PERM_DENIED";
  70                 case PAM_AUTH_ERR:
  71                         return "PAM_AUTH_ERR";
  72                 case PAM_CRED_INSUFFICIENT:
  73                         return "PAM_CRED_INSUFFICIENT";
  74                 case PAM_AUTHINFO_UNAVAIL:
  75                         return "PAM_AUTHINFO_UNAVAIL";
  76                 case PAM_USER_UNKNOWN:
  77                         return "PAM_USER_UNKNOWN";
  78                 case PAM_MAXTRIES:
  79                         return "PAM_MAXTRIES";
  80                 case PAM_NEW_AUTHTOK_REQD:
  81                         return "PAM_NEW_AUTHTOK_REQD";
  82                 case PAM_ACCT_EXPIRED:
  83                         return "PAM_ACCT_EXPIRED";
  84                 case PAM_SESSION_ERR:
  85                         return "PAM_SESSION_ERR";
  86                 case PAM_CRED_UNAVAIL:
  87                         return "PAM_CRED_UNAVAIL";
  88                 case PAM_CRED_EXPIRED:
  89                         return "PAM_CRED_EXPIRED";
  90                 case PAM_CRED_ERR:
  91                         return "PAM_CRED_ERR";
  92                 case PAM_NO_MODULE_DATA:
  93                         return "PAM_NO_MODULE_DATA";
  94                 case PAM_CONV_ERR:
  95                         return "PAM_CONV_ERR";
  96                 case PAM_AUTHTOK_ERR:
  97                         return "PAM_AUTHTOK_ERR";
  98                 case PAM_AUTHTOK_RECOVER_ERR:
  99                         return "PAM_AUTHTOK_RECOVER_ERR";
 100                 case PAM_AUTHTOK_LOCK_BUSY:
 101                         return "PAM_AUTHTOK_LOCK_BUSY";
 102                 case PAM_AUTHTOK_DISABLE_AGING:
 103                         return "PAM_AUTHTOK_DISABLE_AGING";
 104                 case PAM_TRY_AGAIN:
 105                         return "PAM_TRY_AGAIN";
 106                 case PAM_IGNORE:
 107                         return "PAM_IGNORE";
 108                 case PAM_ABORT:
 109                         return "PAM_ABORT";
 110                 case PAM_AUTHTOK_EXPIRED:
 111                         return "PAM_AUTHTOK_EXPIRED";
 112 #ifdef PAM_MODULE_UNKNOWN
 113                 case PAM_MODULE_UNKNOWN:
 114                         return "PAM_MODULE_UNKNOWN";
 115 #endif
 116 #ifdef PAM_BAD_ITEM
 117                 case PAM_BAD_ITEM:
 118                         return "PAM_BAD_ITEM";
 119 #endif
 120 #ifdef PAM_CONV_AGAIN
 121                 case PAM_CONV_AGAIN:
 122                         return "PAM_CONV_AGAIN";
 123 #endif
 124 #ifdef PAM_INCOMPLETE
 125                 case PAM_INCOMPLETE:
 126                         return "PAM_INCOMPLETE";
 127 #endif
 128                 default:
 129                         return NULL;
 130         }
 131 }
 132
 133 #define _PAM_LOG_FUNCTION_ENTER(function, ctx) \
 134         do { \
 135                 _pam_log_debug(ctx, LOG_DEBUG, "[pamh: %p] ENTER: " \
 136                                function " (flags: 0x%04x)", ctx->pamh, ctx->flags); \
 137                 _pam_log_state(ctx); \
 138         } while (0)
 139
 140 #define _PAM_LOG_FUNCTION_LEAVE(function, ctx, retval) \
 141         do { \
 142                 _pam_log_debug(ctx, LOG_DEBUG, "[pamh: %p] LEAVE: " \
 143                                function " returning %d (%s)", ctx->pamh, retval, \
 144                                _pam_error_code_str(retval)); \
 145                 _pam_log_state(ctx); \
 146         } while (0)
 147
 148 /* data tokens */
 149
 150 #define MAX_PASSWD_TRIES        3
 151
 152 #ifdef HAVE_GETTEXT
 153 static char initialized = 0;
 154
 155 static inline void textdomain_init(void);
 156 static inline void textdomain_init(void)
 157 {
 158         if (!initialized) {
 159                 bindtextdomain(MODULE_NAME, dyn_LOCALEDIR);
 160                 initialized = 1;
 161         }
 162         return;
 163 }
 164 #endif
 165
 166
 167 /*
 168  * Work around the pam API that has functions with void ** as parameters
 169  * These lead to strict aliasing warnings with gcc.
 170  */
 171 static int _pam_get_item(const pam_handle_t *pamh,
 172                          int item_type,
 173                          const void *_item)
 174 {
 175         const void **item = (const void **)_item;
 176         return pam_get_item(pamh, item_type, item);
 177 }
 178 static int _pam_get_data(const pam_handle_t *pamh,
 179                          const char *module_data_name,
 180                          const void *_data)
 181 {
 182         const void **data = (const void **)_data;
 183         return pam_get_data(pamh, module_data_name, data);
 184 }
 185
 186 /* some syslogging */
 187
 188 #ifdef HAVE_PAM_VSYSLOG
 189 static void _pam_log_int(const pam_handle_t *pamh,
 190                          int err,
 191                          const char *format,
 192                          va_list args)
 193 {
 194         pam_vsyslog(pamh, err, format, args);
 195 }
 196 #else
 197 static void _pam_log_int(const pam_handle_t *pamh,
 198                          int err,
 199                          const char *format,
 200                          va_list args)
 201 {
 202         char *format2 = NULL;
 203         const char *service;
 204
 205         _pam_get_item(pamh, PAM_SERVICE, &service);
 206
 207         format2 = (char *)malloc(strlen(MODULE_NAME)+strlen(format)+strlen(service)+5);
 208         if (format2 == NULL) {
 209                 /* what else todo ? */
 210                 vsyslog(err, format, args);
 211                 return;
 212         }
 213
 214         sprintf(format2, "%s(%s): %s", MODULE_NAME, service, format);
 215         vsyslog(err, format2, args);
 216         SAFE_FREE(format2);
 217 }
 218 #endif /* HAVE_PAM_VSYSLOG */
 219
 220 static bool _pam_log_is_silent(int ctrl)
 221 {
 222         return on(ctrl, WINBIND_SILENT);
 223 }
 224
 225 static void _pam_log(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
 226 static void _pam_log(struct pwb_context *r, int err, const char *format, ...)
 227 {
 228         va_list args;
 229
 230         if (_pam_log_is_silent(r->ctrl)) {
 231                 return;
 232         }
 233
 234         va_start(args, format);
 235         _pam_log_int(r->pamh, err, format, args);
 236         va_end(args);
 237 }
 238 static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
 239 static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
 240 {
 241         va_list args;
 242
 243         if (_pam_log_is_silent(ctrl)) {
 244                 return;
 245         }
 246
 247         va_start(args, format);
 248         _pam_log_int(pamh, err, format, args);
 249         va_end(args);
 250 }
 251
 252 static bool _pam_log_is_debug_enabled(int ctrl)
 253 {
 254         if (ctrl == -1) {
 255                 return false;
 256         }
 257
 258         if (_pam_log_is_silent(ctrl)) {
 259                 return false;
 260         }
 261
 262         if (!(ctrl & WINBIND_DEBUG_ARG)) {
 263                 return false;
 264         }
 265
 266         return true;
 267 }
 268
 269 static bool _pam_log_is_debug_state_enabled(int ctrl)
 270 {
 271         if (!(ctrl & WINBIND_DEBUG_STATE)) {
 272                 return false;
 273         }
 274
 275         return _pam_log_is_debug_enabled(ctrl);
 276 }
 277
 278 static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
 279 static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...)
 280 {
 281         va_list args;
 282
 283         if (!_pam_log_is_debug_enabled(r->ctrl)) {
 284                 return;
 285         }
 286
 287         va_start(args, format);
 288         _pam_log_int(r->pamh, err, format, args);
 289         va_end(args);
 290 }
 291 static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
 292 static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
 293 {
 294         va_list args;
 295
 296         if (!_pam_log_is_debug_enabled(ctrl)) {
 297                 return;
 298         }
 299
 300         va_start(args, format);
 301         _pam_log_int(pamh, err, format, args);
 302         va_end(args);
 303 }
 304
 305 static void _pam_log_state_datum(struct pwb_context *ctx,
 306                                  int item_type,
 307                                  const char *key,
 308                                  int is_string)
 309 {
 310         const void *data = NULL;
 311         if (item_type != 0) {
 312                 pam_get_item(ctx->pamh, item_type, &data);
 313         } else {
 314                 pam_get_data(ctx->pamh, key, &data);
 315         }
 316         if (data != NULL) {
 317                 const char *type = (item_type != 0) ? "ITEM" : "DATA";
 318                 if (is_string != 0) {
 319                         _pam_log_debug(ctx, LOG_DEBUG,
 320                                        "[pamh: %p] STATE: %s(%s) = \"%s\" (%p)",
 321                                        ctx->pamh, type, key, (const char *)data,
 322                                        data);
 323                 } else {
 324                         _pam_log_debug(ctx, LOG_DEBUG,
 325                                        "[pamh: %p] STATE: %s(%s) = %p",
 326                                        ctx->pamh, type, key, data);
 327                 }
 328         }
 329 }
 330
 331 #define _PAM_LOG_STATE_DATA_POINTER(ctx, module_data_name) \
 332         _pam_log_state_datum(ctx, 0, module_data_name, 0)
 333
 334 #define _PAM_LOG_STATE_DATA_STRING(ctx, module_data_name) \
 335         _pam_log_state_datum(ctx, 0, module_data_name, 1)
 336
 337 #define _PAM_LOG_STATE_ITEM_POINTER(ctx, item_type) \
 338         _pam_log_state_datum(ctx, item_type, #item_type, 0)
 339
 340 #define _PAM_LOG_STATE_ITEM_STRING(ctx, item_type) \
 341         _pam_log_state_datum(ctx, item_type, #item_type, 1)
 342
 343 #ifdef DEBUG_PASSWORD
 344 #define _LOG_PASSWORD_AS_STRING 1
 345 #else
 346 #define _LOG_PASSWORD_AS_STRING 0
 347 #endif
 348
 349 #define _PAM_LOG_STATE_ITEM_PASSWORD(ctx, item_type) \
 350         _pam_log_state_datum(ctx, item_type, #item_type, \
 351                              _LOG_PASSWORD_AS_STRING)
 352
 353 static void _pam_log_state(struct pwb_context *ctx)
 354 {
 355         if (!_pam_log_is_debug_state_enabled(ctx->ctrl)) {
 356                 return;
 357         }
 358
 359         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_SERVICE);
 360         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER);
 361         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_TTY);
 362         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RHOST);
 363         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RUSER);
 364         _PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_OLDAUTHTOK);
 365         _PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_AUTHTOK);
 366         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER_PROMPT);
 367         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_CONV);
 368 #ifdef PAM_FAIL_DELAY
 369         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_FAIL_DELAY);
 370 #endif
 371 #ifdef PAM_REPOSITORY
 372         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_REPOSITORY);
 373 #endif
 374
 375         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_HOMEDIR);
 376         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSCRIPT);
 377         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSERVER);
 378         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_PROFILEPATH);
 379         _PAM_LOG_STATE_DATA_STRING(ctx,
 380                                    PAM_WINBIND_NEW_AUTHTOK_REQD);
 381                                    /* Use atoi to get PAM result code */
 382         _PAM_LOG_STATE_DATA_STRING(ctx,
 383                                    PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH);
 384         _PAM_LOG_STATE_DATA_POINTER(ctx, PAM_WINBIND_PWD_LAST_SET);
 385 }
 386
 387 static int _pam_parse(const pam_handle_t *pamh,
 388                       int flags,
 389                       int argc,
 390                       const char **argv,
 391                       dictionary **result_d)
 392 {
 393         int ctrl = 0;
 394         const char *config_file = NULL;
 395         int i;
 396         const char **v;
 397         dictionary *d = NULL;
 398
 399         if (flags & PAM_SILENT) {
 400                 ctrl |= WINBIND_SILENT;
 401         }
 402
 403         for (i=argc,v=argv; i-- > 0; ++v) {
 404                 if (!strncasecmp(*v, "config", strlen("config"))) {
 405                         ctrl |= WINBIND_CONFIG_FILE;
 406                         config_file = v[i];
 407                         break;
 408                 }
 409         }
 410
 411         if (config_file == NULL) {
 412                 config_file = PAM_WINBIND_CONFIG_FILE;
 413         }
 414
 415         d = iniparser_load(CONST_DISCARD(char *, config_file));
 416         if (d == NULL) {
 417                 goto config_from_pam;
 418         }
 419
 420         if (iniparser_getboolean(d, CONST_DISCARD(char *, "global:debug"), false)) {
 421                 ctrl |= WINBIND_DEBUG_ARG;
 422         }
 423
 424         if (iniparser_getboolean(d, CONST_DISCARD(char *, "global:debug_state"), false)) {
 425                 ctrl |= WINBIND_DEBUG_STATE;
 426         }
 427
 428         if (iniparser_getboolean(d, CONST_DISCARD(char *, "global:cached_login"), false)) {
 429                 ctrl |= WINBIND_CACHED_LOGIN;
 430         }
 431
 432         if (iniparser_getboolean(d, CONST_DISCARD(char *, "global:krb5_auth"), false)) {
 433                 ctrl |= WINBIND_KRB5_AUTH;
 434         }
 435
 436         if (iniparser_getboolean(d, CONST_DISCARD(char *, "global:silent"), false)) {
 437                 ctrl |= WINBIND_SILENT;
 438         }
 439
 440         if (iniparser_getstr(d, CONST_DISCARD(char *, "global:krb5_ccache_type")) != NULL) {
 441                 ctrl |= WINBIND_KRB5_CCACHE_TYPE;
 442         }
 443
 444         if ((iniparser_getstr(d, CONST_DISCARD(char *, "global:require-membership-of"))
 445              != NULL) ||
 446             (iniparser_getstr(d, CONST_DISCARD(char *, "global:require_membership_of"))
 447              != NULL)) {
 448                 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 449         }
 450
 451         if (iniparser_getboolean(d, CONST_DISCARD(char *, "global:try_first_pass"), false)) {
 452                 ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
 453         }
 454
 455         if (iniparser_getint(d, CONST_DISCARD(char *, "global:warn_pwd_expire"), 0)) {
 456                 ctrl |= WINBIND_WARN_PWD_EXPIRE;
 457         }
 458
 459         if (iniparser_getboolean(d, CONST_DISCARD(char *, "global:mkhomedir"), false)) {
 460                 ctrl |= WINBIND_MKHOMEDIR;
 461         }
 462
 463 config_from_pam:
 464         /* step through arguments */
 465         for (i=argc,v=argv; i-- > 0; ++v) {
 466
 467                 /* generic options */
 468                 if (!strcmp(*v,"debug"))
 469                         ctrl |= WINBIND_DEBUG_ARG;
 470                 else if (!strcasecmp(*v, "debug_state"))
 471                         ctrl |= WINBIND_DEBUG_STATE;
 472                 else if (!strcasecmp(*v, "silent"))
 473                         ctrl |= WINBIND_SILENT;
 474                 else if (!strcasecmp(*v, "use_authtok"))
 475                         ctrl |= WINBIND_USE_AUTHTOK_ARG;
 476                 else if (!strcasecmp(*v, "use_first_pass"))
 477                         ctrl |= WINBIND_USE_FIRST_PASS_ARG;
 478                 else if (!strcasecmp(*v, "try_first_pass"))
 479                         ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
 480                 else if (!strcasecmp(*v, "unknown_ok"))
 481                         ctrl |= WINBIND_UNKNOWN_OK_ARG;
 482                 else if (!strncasecmp(*v, "require_membership_of",
 483                                       strlen("require_membership_of")))
 484                         ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 485                 else if (!strncasecmp(*v, "require-membership-of",
 486                                       strlen("require-membership-of")))
 487                         ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 488                 else if (!strcasecmp(*v, "krb5_auth"))
 489                         ctrl |= WINBIND_KRB5_AUTH;
 490                 else if (!strncasecmp(*v, "krb5_ccache_type",
 491                                       strlen("krb5_ccache_type")))
 492                         ctrl |= WINBIND_KRB5_CCACHE_TYPE;
 493                 else if (!strcasecmp(*v, "cached_login"))
 494                         ctrl |= WINBIND_CACHED_LOGIN;
 495                 else if (!strcasecmp(*v, "mkhomedir"))
 496                         ctrl |= WINBIND_MKHOMEDIR;
 497                 else {
 498                         __pam_log(pamh, ctrl, LOG_ERR,
 499                                  "pam_parse: unknown option: %s", *v);
 500                         return -1;
 501                 }
 502
 503         }
 504
 505         if (result_d) {
 506                 *result_d = d;
 507         } else {
 508                 if (d) {
 509                         iniparser_freedict(d);
 510                 }
 511         }
 512
 513         return ctrl;
 514 };
 515
 516 static int _pam_winbind_free_context(struct pwb_context *ctx)
 517 {
 518         if (!ctx) {
 519                 return 0;
 520         }
 521
 522         if (ctx->dict) {
 523                 iniparser_freedict(ctx->dict);
 524         }
 525
 526         return 0;
 527 }
 528
 529 static int _pam_winbind_init_context(pam_handle_t *pamh,
 530                                      int flags,
 531                                      int argc,
 532                                      const char **argv,
 533                                      struct pwb_context **ctx_p)
 534 {
 535         struct pwb_context *r = NULL;
 536
 537 #ifdef HAVE_GETTEXT
 538         textdomain_init();
 539 #endif
 540
 541         r = TALLOC_ZERO_P(NULL, struct pwb_context);
 542         if (!r) {
 543                 return PAM_BUF_ERR;
 544         }
 545
 546         talloc_set_destructor(r, _pam_winbind_free_context);
 547
 548         r->pamh = pamh;
 549         r->flags = flags;
 550         r->argc = argc;
 551         r->argv = argv;
 552         r->ctrl = _pam_parse(pamh, flags, argc, argv, &r->dict);
 553         if (r->ctrl == -1) {
 554                 TALLOC_FREE(r);
 555                 return PAM_SYSTEM_ERR;
 556         }
 557
 558         *ctx_p = r;
 559
 560         return PAM_SUCCESS;
 561 }
 562
 563 static void _pam_winbind_cleanup_func(pam_handle_t *pamh,
 564                                       void *data,
 565                                       int error_status)
 566 {
 567         int ctrl = _pam_parse(pamh, 0, 0, NULL, NULL);
 568         if (_pam_log_is_debug_state_enabled(ctrl)) {
 569                 __pam_log_debug(pamh, ctrl, LOG_DEBUG,
 570                                "[pamh: %p] CLEAN: cleaning up PAM data %p "
 571                                "(error_status = %d)", pamh, data,
 572                                error_status);
 573         }
 574         TALLOC_FREE(data);
 575 }
 576
 577
 578 static const struct ntstatus_errors {
 579         const char *ntstatus_string;
 580         const char *error_string;
 581 } ntstatus_errors[] = {
 582         {"NT_STATUS_OK",
 583                 N_("Success")},
 584         {"NT_STATUS_BACKUP_CONTROLLER",
 585                 N_("No primary Domain Controler available")},
 586         {"NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
 587                 N_("No domain controllers found")},
 588         {"NT_STATUS_NO_LOGON_SERVERS",
 589                 N_("No logon servers")},
 590         {"NT_STATUS_PWD_TOO_SHORT",
 591                 N_("Password too short")},
 592         {"NT_STATUS_PWD_TOO_RECENT",
 593                 N_("The password of this user is too recent to change")},
 594         {"NT_STATUS_PWD_HISTORY_CONFLICT",
 595                 N_("Password is already in password history")},
 596         {"NT_STATUS_PASSWORD_EXPIRED",
 597                 N_("Your password has expired")},
 598         {"NT_STATUS_PASSWORD_MUST_CHANGE",
 599                 N_("You need to change your password now")},
 600         {"NT_STATUS_INVALID_WORKSTATION",
 601                 N_("You are not allowed to logon from this workstation")},
 602         {"NT_STATUS_INVALID_LOGON_HOURS",
 603                 N_("You are not allowed to logon at this time")},
 604         {"NT_STATUS_ACCOUNT_EXPIRED",
 605                 N_("Your account has expired. "
 606                    "Please contact your System administrator")}, /* SCNR */
 607         {"NT_STATUS_ACCOUNT_DISABLED",
 608                 N_("Your account is disabled. "
 609                    "Please contact your System administrator")}, /* SCNR */
 610         {"NT_STATUS_ACCOUNT_LOCKED_OUT",
 611                 N_("Your account has been locked. "
 612                    "Please contact your System administrator")}, /* SCNR */
 613         {"NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
 614                 N_("Invalid Trust Account")},
 615         {"NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
 616                 N_("Invalid Trust Account")},
 617         {"NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
 618                 N_("Invalid Trust Account")},
 619         {"NT_STATUS_ACCESS_DENIED",
 620                 N_("Access is denied")},
 621         {NULL, NULL}
 622 };
 623
 624 static const char *_get_ntstatus_error_string(const char *nt_status_string)
 625 {
 626         int i;
 627         for (i=0; ntstatus_errors[i].ntstatus_string != NULL; i++) {
 628                 if (!strcasecmp(ntstatus_errors[i].ntstatus_string,
 629                                 nt_status_string)) {
 630                         return _(ntstatus_errors[i].error_string);
 631                 }
 632         }
 633         return NULL;
 634 }
 635
 636 /* --- authentication management functions --- */
 637
 638 /* Attempt a conversation */
 639
 640 static int converse(const pam_handle_t *pamh,
 641                     int nargs,
 642                     struct pam_message **message,
 643                     struct pam_response **response)
 644 {
 645         int retval;
 646         struct pam_conv *conv;
 647
 648         retval = _pam_get_item(pamh, PAM_CONV, &conv);
 649         if (retval == PAM_SUCCESS) {
 650                 retval = conv->conv(nargs,
 651                                     (const struct pam_message **)message,
 652                                     response, conv->appdata_ptr);
 653         }
 654
 655         return retval; /* propagate error status */
 656 }
 657
 658
 659 static int _make_remark(struct pwb_context *ctx,
 660                         int type,
 661                         const char *text)
 662 {
 663         int retval = PAM_SUCCESS;
 664
 665         struct pam_message *pmsg[1], msg[1];
 666         struct pam_response *resp;
 667
 668         if (ctx->flags & WINBIND_SILENT) {
 669                 return PAM_SUCCESS;
 670         }
 671
 672         pmsg[0] = &msg[0];
 673         msg[0].msg = discard_const_p(char, text);
 674         msg[0].msg_style = type;
 675
 676         resp = NULL;
 677         retval = converse(ctx->pamh, 1, pmsg, &resp);
 678
 679         if (resp) {
 680                 _pam_drop_reply(resp, 1);
 681         }
 682         return retval;
 683 }
 684
 685 static int _make_remark_v(struct pwb_context *ctx,
 686                           int type,
 687                           const char *format,
 688                           va_list args)
 689 {
 690         char *var;
 691         int ret;
 692
 693         ret = vasprintf(&var, format, args);
 694         if (ret < 0) {
 695                 _pam_log(ctx, LOG_ERR, "memory allocation failure");
 696                 return ret;
 697         }
 698
 699         ret = _make_remark(ctx, type, var);
 700         SAFE_FREE(var);
 701         return ret;
 702 }
 703
 704 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
 705 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...)
 706 {
 707         int ret;
 708         va_list args;
 709
 710         va_start(args, format);
 711         ret = _make_remark_v(ctx, type, format, args);
 712         va_end(args);
 713         return ret;
 714 }
 715
 716 static int pam_winbind_request_log(struct pwb_context *ctx,
 717                                    int retval,
 718                                    const char *user,
 719                                    const char *fn)
 720 {
 721         switch (retval) {
 722         case PAM_AUTH_ERR:
 723                 /* incorrect password */
 724                 _pam_log(ctx, LOG_WARNING, "user '%s' denied access "
 725                          "(incorrect password or invalid membership)", user);
 726                 return retval;
 727         case PAM_ACCT_EXPIRED:
 728                 /* account expired */
 729                 _pam_log(ctx, LOG_WARNING, "user '%s' account expired",
 730                          user);
 731                 return retval;
 732         case PAM_AUTHTOK_EXPIRED:
 733                 /* password expired */
 734                 _pam_log(ctx, LOG_WARNING, "user '%s' password expired",
 735                          user);
 736                 return retval;
 737         case PAM_NEW_AUTHTOK_REQD:
 738                 /* new password required */
 739                 _pam_log(ctx, LOG_WARNING, "user '%s' new password "
 740                          "required", user);
 741                 return retval;
 742         case PAM_USER_UNKNOWN:
 743                 /* the user does not exist */
 744                 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
 745                                user);
 746                 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
 747                         return PAM_IGNORE;
 748                 }
 749                 return retval;
 750         case PAM_SUCCESS:
 751                 /* Otherwise, the authentication looked good */
 752                 if (strcmp(fn, "wbcLogonUser") == 0) {
 753                         _pam_log(ctx, LOG_NOTICE,
 754                                  "user '%s' granted access", user);
 755                 } else {
 756                         _pam_log(ctx, LOG_NOTICE,
 757                                  "user '%s' OK", user);
 758                 }
 759                 return retval;
 760         default:
 761                 /* we don't know anything about this return value */
 762                 _pam_log(ctx, LOG_ERR,
 763                          "internal module error (retval = %s(%d), user = '%s')",
 764                         _pam_error_code_str(retval), retval, user);
 765                 return retval;
 766         }
 767 }
 768
 769 static int wbc_auth_error_to_pam_error(struct pwb_context *ctx,
 770                                        struct wbcAuthErrorInfo *e,
 771                                        wbcErr status,
 772                                        const char *username,
 773                                        const char *fn)
 774 {
 775         int ret = PAM_AUTH_ERR;
 776
 777         if (WBC_ERROR_IS_OK(status)) {
 778                 _pam_log_debug(ctx, LOG_DEBUG, "request %s succeeded",
 779                         fn);
 780                 ret = PAM_SUCCESS;
 781                 return pam_winbind_request_log(ctx, ret, username, fn);
 782         }
 783
 784         if (e) {
 785                 if (e->pam_error != PAM_SUCCESS) {
 786                         _pam_log(ctx, LOG_ERR,
 787                                  "request %s failed: %s, "
 788                                  "PAM error: %s (%d), NTSTATUS: %s, "
 789                                  "Error message was: %s",
 790                                  fn,
 791                                  wbcErrorString(status),
 792                                  _pam_error_code_str(e->pam_error),
 793                                  e->pam_error,
 794                                  e->nt_string,
 795                                  e->display_string);
 796                         ret = e->pam_error;
 797                         return pam_winbind_request_log(ctx, ret, username, fn);
 798                 }
 799
 800                 _pam_log(ctx, LOG_ERR, "request %s failed, but PAM error 0!", fn);
 801
 802                 ret = PAM_SERVICE_ERR;
 803                 return pam_winbind_request_log(ctx, ret, username, fn);
 804         }
 805
 806         ret = wbc_error_to_pam_error(status);
 807         return pam_winbind_request_log(ctx, ret, username, fn);
 808 }
 809
 810 static bool _pam_winbind_change_pwd(struct pwb_context *ctx)
 811 {
 812         struct pam_message msg, *pmsg;
 813         struct pam_response *resp = NULL;
 814         const char *prompt;
 815         int ret;
 816         bool retval = false;
 817         prompt = _("Do you want to change your password now?");
 818         pmsg = &msg;
 819         msg.msg_style = PAM_RADIO_TYPE;
 820         msg.msg = prompt;
 821         ret = converse(ctx->pamh, 1, &pmsg, &resp);
 822         if (resp == NULL) {
 823                 if (ret == PAM_SUCCESS) {
 824                         _pam_log(ctx, LOG_CRIT, "pam_winbind: system error!\n");
 825                         return false;
 826                 }
 827         }
 828         if (ret != PAM_SUCCESS) {
 829                 return false;
 830         }
 831         _pam_log(ctx, LOG_CRIT, "Received [%s] reply from application.\n", resp->resp);
 832
 833         if (strcasecmp(resp->resp, "yes") == 0) {
 834                 retval = true;
 835         }
 836
 837         _pam_drop_reply(resp, 1);
 838         return retval;
 839 }
 840
 841
 842 /**
 843  * send a password expiry message if required
 844  *
 845  * @param ctx PAM winbind context.
 846  * @param next_change expected (calculated) next expiry date.
 847  * @param already_expired pointer to a boolean to indicate if the password is
 848  *        already expired.
 849  *
 850  * @return boolean Returns true if message has been sent, false if not.
 851  */
 852
 853 static bool _pam_send_password_expiry_message(struct pwb_context *ctx,
 854                                               time_t next_change,
 855                                               time_t now,
 856                                               int warn_pwd_expire,
 857                                               bool *already_expired,
 858                                               bool *change_pwd)
 859 {
 860         int days = 0;
 861         struct tm tm_now, tm_next_change;
 862         bool retval = false;
 863         int ret;
 864
 865         if (already_expired) {
 866                 *already_expired = false;
 867         }
 868
 869         if (change_pwd) {
 870                 *change_pwd = false;
 871         }
 872
 873         if (next_change <= now) {
 874                 PAM_WB_REMARK_DIRECT(ctx, "NT_STATUS_PASSWORD_EXPIRED");
 875                 if (already_expired) {
 876                         *already_expired = true;
 877                 }
 878                 return true;
 879         }
 880
 881         if ((next_change < 0) ||
 882             (next_change > now + warn_pwd_expire * SECONDS_PER_DAY)) {
 883                 return false;
 884         }
 885
 886         if ((localtime_r(&now, &tm_now) == NULL) ||
 887             (localtime_r(&next_change, &tm_next_change) == NULL)) {
 888                 return false;
 889         }
 890
 891         days = (tm_next_change.tm_yday+tm_next_change.tm_year*365) -
 892                (tm_now.tm_yday+tm_now.tm_year*365);
 893
 894         if (days == 0) {
 895                 ret = _make_remark(ctx, PAM_TEXT_INFO,
 896                                 _("Your password expires today.\n"));
 897
 898                 /*
 899                  * If change_pwd and already_expired is null.
 900                  * We are just sending a notification message.
 901                  * We don't expect any response in this case.
 902                  */
 903
 904                 if (!change_pwd && !already_expired) {
 905                         return true;
 906                 }
 907
 908                 /*
 909                  * successfully sent the warning message.
 910                  * Give the user a chance to change pwd.
 911                  */
 912                 if (ret == PAM_SUCCESS) {
 913                         if (change_pwd) {
 914                                 retval = _pam_winbind_change_pwd(ctx);
 915                                 if (retval) {
 916                                         *change_pwd = true;
 917                                 }
 918                         }
 919                 }
 920                 return true;
 921         }
 922
 923         if (days > 0 && days < warn_pwd_expire) {
 924
 925                 ret = _make_remark_format(ctx, PAM_TEXT_INFO,
 926                                         _("Your password will expire in %d %s.\n"),
 927                                         days, (days > 1) ? _("days"):_("day"));
 928                 /*
 929                  * If change_pwd and already_expired is null.
 930                  * We are just sending a notification message.
 931                  * We don't expect any response in this case.
 932                  */
 933
 934                 if (!change_pwd && !already_expired) {
 935                         return true;
 936                 }
 937
 938                 /*
 939                  * successfully sent the warning message.
 940                  * Give the user a chance to change pwd.
 941                  */
 942                 if (ret == PAM_SUCCESS) {
 943                         if (change_pwd) {
 944                                 retval = _pam_winbind_change_pwd(ctx);
 945                                 if (retval) {
 946                                         *change_pwd = true;
 947                                 }
 948                         }
 949                 }
 950                 return true;
 951         }
 952
 953         return false;
 954 }
 955
 956 /**
 957  * Send a warning if the password expires in the near future
 958  *
 959  * @param ctx PAM winbind context.
 960  * @param response The full authentication response structure.
 961  * @param already_expired boolean, is the pwd already expired?
 962  *
 963  * @return void.
 964  */
 965
 966 static void _pam_warn_password_expiry(struct pwb_context *ctx,
 967                                       const struct wbcAuthUserInfo *info,
 968                                       const struct wbcUserPasswordPolicyInfo *policy,
 969                                       int warn_pwd_expire,
 970                                       bool *already_expired,
 971                                       bool *change_pwd)
 972 {
 973         time_t now = time(NULL);
 974         time_t next_change = 0;
 975
 976         if (!info || !policy) {
 977                 return;
 978         }
 979
 980         if (already_expired) {
 981                 *already_expired = false;
 982         }
 983
 984         if (change_pwd) {
 985                 *change_pwd = false;
 986         }
 987
 988         /* accounts with WBC_ACB_PWNOEXP set never receive a warning */
 989         if (info->acct_flags & WBC_ACB_PWNOEXP) {
 990                 return;
 991         }
 992
 993         /* no point in sending a warning if this is a grace logon */
 994         if (PAM_WB_GRACE_LOGON(info->user_flags)) {
 995                 return;
 996         }
 997
 998         /* check if the info3 must change timestamp has been set */
 999         next_change = info->pass_must_change_time;
1000
1001         if (_pam_send_password_expiry_message(ctx, next_change, now,
1002                                               warn_pwd_expire,
1003                                               already_expired,
1004                                               change_pwd)) {
1005                 return;
1006         }
1007
1008         /* now check for the global password policy */
1009         /* good catch from Ralf Haferkamp: an expiry of "never" is translated
1010          * to -1 */
1011         if ((policy->expire == (int64_t)-1) ||
1012             (policy->expire == 0)) {
1013                 return;
1014         }
1015
1016         next_change = info->pass_last_set_time + policy->expire;
1017
1018         if (_pam_send_password_expiry_message(ctx, next_change, now,
1019                                               warn_pwd_expire,
1020                                               already_expired,
1021                                               change_pwd)) {
1022                 return;
1023         }
1024
1025         /* no warning sent */
1026 }
1027
1028 #define IS_SID_STRING(name) (strncmp("S-", name, 2) == 0)
1029
1030 /**
1031  * Append a string, making sure not to overflow and to always return a
1032  * NULL-terminated string.
1033  *
1034  * @param dest Destination string buffer (must already be NULL-terminated).
1035  * @param src Source string buffer.
1036  * @param dest_buffer_size Size of dest buffer in bytes.
1037  *
1038  * @return false if dest buffer is not big enough (no bytes copied), true on
1039  * success.
1040  */
1041
1042 static bool safe_append_string(char *dest,
1043                                const char *src,
1044                                int dest_buffer_size)
1045 {
1046         int dest_length = strlen(dest);
1047         int src_length = strlen(src);
1048
1049         if (dest_length + src_length + 1 > dest_buffer_size) {
1050                 return false;
1051         }
1052
1053         memcpy(dest + dest_length, src, src_length + 1);
1054         return true;
1055 }
1056
1057 /**
1058  * Convert a names into a SID string, appending it to a buffer.
1059  *
1060  * @param ctx PAM winbind context.
1061  * @param user User in PAM request.
1062  * @param name Name to convert.
1063  * @param sid_list_buffer Where to append the string sid.
1064  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1065  *
1066  * @return false on failure, true on success.
1067  */
1068 static bool winbind_name_to_sid_string(struct pwb_context *ctx,
1069                                        const char *user,
1070                                        const char *name,
1071                                        char *sid_list_buffer,
1072                                        int sid_list_buffer_size)
1073 {
1074         const char* sid_string = NULL;
1075         char *sid_str = NULL;
1076
1077         /* lookup name? */
1078         if (IS_SID_STRING(name)) {
1079                 sid_string = name;
1080         } else {
1081                 wbcErr wbc_status;
1082                 struct wbcDomainSid sid;
1083                 enum wbcSidType type;
1084
1085                 _pam_log_debug(ctx, LOG_DEBUG,
1086                                "no sid given, looking up: %s\n", name);
1087
1088                 wbc_status = wbcLookupName("", name, &sid, &type);
1089                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1090                         _pam_log(ctx, LOG_INFO,
1091                                  "could not lookup name: %s\n", name);
1092                         return false;
1093                 }
1094
1095                 wbc_status = wbcSidToString(&sid, &sid_str);
1096                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1097                         return false;
1098                 }
1099
1100                 sid_string = sid_str;
1101         }
1102
1103         if (!safe_append_string(sid_list_buffer, sid_string,
1104                                 sid_list_buffer_size)) {
1105                 wbcFreeMemory(sid_str);
1106                 return false;
1107         }
1108
1109         wbcFreeMemory(sid_str);
1110         return true;
1111 }
1112
1113 /**
1114  * Convert a list of names into a list of sids.
1115  *
1116  * @param ctx PAM winbind context.
1117  * @param user User in PAM request.
1118  * @param name_list List of names or string sids, separated by commas.
1119  * @param sid_list_buffer Where to put the list of string sids.
1120  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1121  *
1122  * @return false on failure, true on success.
1123  */
1124 static bool winbind_name_list_to_sid_string_list(struct pwb_context *ctx,
1125                                                  const char *user,
1126                                                  const char *name_list,
1127                                                  char *sid_list_buffer,
1128                                                  int sid_list_buffer_size)
1129 {
1130         bool result = false;
1131         char *current_name = NULL;
1132         const char *search_location;
1133         const char *comma;
1134
1135         if (sid_list_buffer_size > 0) {
1136                 sid_list_buffer[0] = 0;
1137         }
1138
1139         search_location = name_list;
1140         while ((comma = strstr(search_location, ",")) != NULL) {
1141                 current_name = strndup(search_location,
1142                                        comma - search_location);
1143                 if (NULL == current_name) {
1144                         goto out;
1145                 }
1146
1147                 if (!winbind_name_to_sid_string(ctx, user,
1148                                                 current_name,
1149                                                 sid_list_buffer,
1150                                                 sid_list_buffer_size)) {
1151                         /*
1152                          * If one group name failed, we must not fail
1153                          * the authentication totally, continue with
1154                          * the following group names. If user belongs to
1155                          * one of the valid groups, we must allow it
1156                          * login. -- BoYang
1157                          */
1158
1159                         _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1160                                  "check if group %s is valid group.", current_name,
1161                                  current_name);
1162                         _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1163                                         "to sid, please contact your administrator to see "
1164                                         "if group %s is valid."), current_name, current_name);
1165                         SAFE_FREE(current_name);
1166                         search_location = comma + 1;
1167                         continue;
1168                 }
1169
1170                 SAFE_FREE(current_name);
1171
1172                 if (!safe_append_string(sid_list_buffer, ",",
1173                                         sid_list_buffer_size)) {
1174                         goto out;
1175                 }
1176
1177                 search_location = comma + 1;
1178         }
1179
1180         if (!winbind_name_to_sid_string(ctx, user, search_location,
1181                                         sid_list_buffer,
1182                                         sid_list_buffer_size)) {
1183                 _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1184                          "check if group %s is valid group.", search_location,
1185                          search_location);
1186                 _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1187                                 "to sid, please contact your administrator to see "
1188                                 "if group %s is valid."), search_location, search_location);
1189         }
1190
1191         result = true;
1192
1193 out:
1194         SAFE_FREE(current_name);
1195         return result;
1196 }
1197
1198 /**
1199  * put krb5ccname variable into environment
1200  *
1201  * @param ctx PAM winbind context.
1202  * @param krb5ccname env variable retrieved from winbindd.
1203  *
1204  * @return void.
1205  */
1206
1207 static void _pam_setup_krb5_env(struct pwb_context *ctx,
1208                                 struct wbcLogonUserInfo *info)
1209 {
1210         char var[PATH_MAX];
1211         int ret;
1212         uint32_t i;
1213         const char *krb5ccname = NULL;
1214
1215         if (off(ctx->ctrl, WINBIND_KRB5_AUTH)) {
1216                 return;
1217         }
1218
1219         if (!info) {
1220                 return;
1221         }
1222
1223         for (i=0; i < info->num_blobs; i++) {
1224                 if (strcasecmp(info->blobs[i].name, "krb5ccname") == 0) {
1225                         krb5ccname = (const char *)info->blobs[i].blob.data;
1226                         break;
1227                 }
1228         }
1229
1230         if (!krb5ccname || (strlen(krb5ccname) == 0)) {
1231                 return;
1232         }
1233
1234         _pam_log_debug(ctx, LOG_DEBUG,
1235                        "request returned KRB5CCNAME: %s", krb5ccname);
1236
1237         if (snprintf(var, sizeof(var), "KRB5CCNAME=%s", krb5ccname) == -1) {
1238                 return;
1239         }
1240
1241         ret = pam_putenv(ctx->pamh, var);
1242         if (ret) {
1243                 _pam_log(ctx, LOG_ERR,
1244                          "failed to set KRB5CCNAME to %s: %s",
1245                          var, pam_strerror(ctx->pamh, ret));
1246         }
1247 }
1248
1249 /**
1250  * Copy unix username if available (further processed in PAM).
1251  *
1252  * @param ctx PAM winbind context
1253  * @param user_ret A pointer that holds a pointer to a string
1254  * @param unix_username A username
1255  *
1256  * @return void.
1257  */
1258
1259 static void _pam_setup_unix_username(struct pwb_context *ctx,
1260                                      char **user_ret,
1261                                      struct wbcLogonUserInfo *info)
1262 {
1263         const char *unix_username = NULL;
1264         uint32_t i;
1265
1266         if (!user_ret || !info) {
1267                 return;
1268         }
1269
1270         for (i=0; i < info->num_blobs; i++) {
1271                 if (strcasecmp(info->blobs[i].name, "unix_username") == 0) {
1272                         unix_username = (const char *)info->blobs[i].blob.data;
1273                         break;
1274                 }
1275         }
1276
1277         if (!unix_username || !unix_username[0]) {
1278                 return;
1279         }
1280
1281         *user_ret = strdup(unix_username);
1282 }
1283
1284 /**
1285  * Set string into the PAM stack.
1286  *
1287  * @param ctx PAM winbind context.
1288  * @param data_name Key name for pam_set_data.
1289  * @param value String value.
1290  *
1291  * @return void.
1292  */
1293
1294 static void _pam_set_data_string(struct pwb_context *ctx,
1295                                  const char *data_name,
1296                                  const char *value)
1297 {
1298         int ret;
1299
1300         if (!data_name || !value || (strlen(data_name) == 0) ||
1301              (strlen(value) == 0)) {
1302                 return;
1303         }
1304
1305         ret = pam_set_data(ctx->pamh, data_name, talloc_strdup(NULL, value),
1306                            _pam_winbind_cleanup_func);
1307         if (ret) {
1308                 _pam_log_debug(ctx, LOG_DEBUG,
1309                                "Could not set data %s: %s\n",
1310                                data_name, pam_strerror(ctx->pamh, ret));
1311         }
1312 }
1313
1314 /**
1315  * Set info3 strings into the PAM stack.
1316  *
1317  * @param ctx PAM winbind context.
1318  * @param data_name Key name for pam_set_data.
1319  * @param value String value.
1320  *
1321  * @return void.
1322  */
1323
1324 static void _pam_set_data_info3(struct pwb_context *ctx,
1325                                 const struct wbcAuthUserInfo *info)
1326 {
1327         _pam_set_data_string(ctx, PAM_WINBIND_HOMEDIR,
1328                              info->home_directory);
1329         _pam_set_data_string(ctx, PAM_WINBIND_LOGONSCRIPT,
1330                              info->logon_script);
1331         _pam_set_data_string(ctx, PAM_WINBIND_LOGONSERVER,
1332                              info->logon_server);
1333         _pam_set_data_string(ctx, PAM_WINBIND_PROFILEPATH,
1334                              info->profile_path);
1335 }
1336
1337 /**
1338  * Free info3 strings in the PAM stack.
1339  *
1340  * @param pamh PAM handle
1341  *
1342  * @return void.
1343  */
1344
1345 static void _pam_free_data_info3(pam_handle_t *pamh)
1346 {
1347         pam_set_data(pamh, PAM_WINBIND_HOMEDIR, NULL, NULL);
1348         pam_set_data(pamh, PAM_WINBIND_LOGONSCRIPT, NULL, NULL);
1349         pam_set_data(pamh, PAM_WINBIND_LOGONSERVER, NULL, NULL);
1350         pam_set_data(pamh, PAM_WINBIND_PROFILEPATH, NULL, NULL);
1351 }
1352
1353 /**
1354  * Send PAM_ERROR_MSG for cached or grace logons.
1355  *
1356  * @param ctx PAM winbind context.
1357  * @param username User in PAM request.
1358  * @param info3_user_flgs Info3 flags containing logon type bits.
1359  *
1360  * @return void.
1361  */
1362
1363 static void _pam_warn_logon_type(struct pwb_context *ctx,
1364                                  const char *username,
1365                                  uint32_t info3_user_flgs)
1366 {
1367         /* inform about logon type */
1368         if (PAM_WB_GRACE_LOGON(info3_user_flgs)) {
1369
1370                 _make_remark(ctx, PAM_ERROR_MSG,
1371                              _("Grace login. "
1372                                "Please change your password as soon you're "
1373                                "online again"));
1374                 _pam_log_debug(ctx, LOG_DEBUG,
1375                                "User %s logged on using grace logon\n",
1376                                username);
1377
1378         } else if (PAM_WB_CACHED_LOGON(info3_user_flgs)) {
1379
1380                 _make_remark(ctx, PAM_ERROR_MSG,
1381                              _("Domain Controller unreachable, "
1382                                "using cached credentials instead. "
1383                                "Network resources may be unavailable"));
1384                 _pam_log_debug(ctx, LOG_DEBUG,
1385                                "User %s logged on using cached credentials\n",
1386                                username);
1387         }
1388 }
1389
1390 /**
1391  * Send PAM_ERROR_MSG for krb5 errors.
1392  *
1393  * @param ctx PAM winbind context.
1394  * @param username User in PAM request.
1395  * @param info3_user_flgs Info3 flags containing logon type bits.
1396  *
1397  * @return void.
1398  */
1399
1400 static void _pam_warn_krb5_failure(struct pwb_context *ctx,
1401                                    const char *username,
1402                                    uint32_t info3_user_flgs)
1403 {
1404         if (PAM_WB_KRB5_CLOCK_SKEW(info3_user_flgs)) {
1405                 _make_remark(ctx, PAM_ERROR_MSG,
1406                              _("Failed to establish your Kerberos Ticket cache "
1407                                "due time differences\n"
1408                                "with the domain controller.  "
1409                                "Please verify the system time.\n"));
1410                 _pam_log_debug(ctx, LOG_DEBUG,
1411                                "User %s: Clock skew when getting Krb5 TGT\n",
1412                                username);
1413         }
1414 }
1415
1416 static bool _pam_check_remark_auth_err(struct pwb_context *ctx,
1417                                        const struct wbcAuthErrorInfo *e,
1418                                        const char *nt_status_string,
1419                                        int *pam_error)
1420 {
1421         const char *ntstatus = NULL;
1422         const char *error_string = NULL;
1423
1424         if (!e || !pam_error) {
1425                 return false;
1426         }
1427
1428         ntstatus = e->nt_string;
1429         if (!ntstatus) {
1430                 return false;
1431         }
1432
1433         if (strcasecmp(ntstatus, nt_status_string) == 0) {
1434
1435                 error_string = _get_ntstatus_error_string(nt_status_string);
1436                 if (error_string) {
1437                         _make_remark(ctx, PAM_ERROR_MSG, error_string);
1438                         *pam_error = e->pam_error;
1439                         return true;
1440                 }
1441
1442                 if (e->display_string) {
1443                         _make_remark(ctx, PAM_ERROR_MSG, e->display_string);
1444                         *pam_error = e->pam_error;
1445                         return true;
1446                 }
1447
1448                 _make_remark(ctx, PAM_ERROR_MSG, nt_status_string);
1449                 *pam_error = e->pam_error;
1450
1451                 return true;
1452         }
1453
1454         return false;
1455 };
1456
1457 /**
1458  * Compose Password Restriction String for a PAM_ERROR_MSG conversation.
1459  *
1460  * @param i The wbcUserPasswordPolicyInfo struct.
1461  *
1462  * @return string (caller needs to talloc_free).
1463  */
1464
1465 static char *_pam_compose_pwd_restriction_string(struct pwb_context *ctx,
1466                                                  struct wbcUserPasswordPolicyInfo *i)
1467 {
1468         char *str = NULL;
1469
1470         if (!i) {
1471                 goto failed;
1472         }
1473
1474         str = talloc_asprintf(ctx, _("Your password "));
1475         if (!str) {
1476                 goto failed;
1477         }
1478
1479         if (i->min_length_password > 0) {
1480                 str = talloc_asprintf_append(str,
1481                                _("must be at least %d characters; "),
1482                                i->min_length_password);
1483                 if (!str) {
1484                         goto failed;
1485                 }
1486         }
1487
1488         if (i->password_history > 0) {
1489                 str = talloc_asprintf_append(str,
1490                                _("cannot repeat any of your previous %d "
1491                                 "passwords; "),
1492                                i->password_history);
1493                 if (!str) {
1494                         goto failed;
1495                 }
1496         }
1497
1498         if (i->password_properties & WBC_DOMAIN_PASSWORD_COMPLEX) {
1499                 str = talloc_asprintf_append(str,
1500                                _("must contain capitals, numerals "
1501                                  "or punctuation; "
1502                                  "and cannot contain your account "
1503                                  "or full name; "));
1504                 if (!str) {
1505                         goto failed;
1506                 }
1507         }
1508
1509         str = talloc_asprintf_append(str,
1510                        _("Please type a different password. "
1511                          "Type a password which meets these requirements in "
1512                          "both text boxes."));
1513         if (!str) {
1514                 goto failed;
1515         }
1516
1517         return str;
1518
1519  failed:
1520         TALLOC_FREE(str);
1521         return NULL;
1522 }
1523
1524 static int _pam_create_homedir(struct pwb_context *ctx,
1525                                const char *dirname,
1526                                mode_t mode)
1527 {
1528         struct stat sbuf;
1529
1530         if (stat(dirname, &sbuf) == 0) {
1531                 return PAM_SUCCESS;
1532         }
1533
1534         if (mkdir(dirname, mode) != 0) {
1535
1536                 _make_remark_format(ctx, PAM_TEXT_INFO,
1537                                     _("Creating directory: %s failed: %s"),
1538                                     dirname, strerror(errno));
1539                 _pam_log(ctx, LOG_ERR, "could not create dir: %s (%s)",
1540                  dirname, strerror(errno));
1541                  return PAM_PERM_DENIED;
1542         }
1543
1544         return PAM_SUCCESS;
1545 }
1546
1547 static int _pam_chown_homedir(struct pwb_context *ctx,
1548                               const char *dirname,
1549                               uid_t uid,
1550                               gid_t gid)
1551 {
1552         if (chown(dirname, uid, gid) != 0) {
1553                 _pam_log(ctx, LOG_ERR, "failed to chown user homedir: %s (%s)",
1554                          dirname, strerror(errno));
1555                 return PAM_PERM_DENIED;
1556         }
1557
1558         return PAM_SUCCESS;
1559 }
1560
1561 static int _pam_mkhomedir(struct pwb_context *ctx)
1562 {
1563         struct passwd *pwd = NULL;
1564         char *token = NULL;
1565         char *create_dir = NULL;
1566         char *user_dir = NULL;
1567         int ret;
1568         const char *username;
1569         mode_t mode = 0700;
1570         char *safe_ptr = NULL;
1571         char *p = NULL;
1572
1573         /* Get the username */
1574         ret = pam_get_user(ctx->pamh, &username, NULL);
1575         if ((ret != PAM_SUCCESS) || (!username)) {
1576                 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1577                 return PAM_SERVICE_ERR;
1578         }
1579
1580         pwd = getpwnam(username);
1581         if (pwd == NULL) {
1582                 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1583                 return PAM_USER_UNKNOWN;
1584         }
1585         _pam_log_debug(ctx, LOG_DEBUG, "homedir is: %s", pwd->pw_dir);
1586
1587         ret = _pam_create_homedir(ctx, pwd->pw_dir, 0700);
1588         if (ret == PAM_SUCCESS) {
1589                 ret = _pam_chown_homedir(ctx, pwd->pw_dir,
1590                                          pwd->pw_uid,
1591                                          pwd->pw_gid);
1592         }
1593
1594         if (ret == PAM_SUCCESS) {
1595                 return ret;
1596         }
1597
1598         /* maybe we need to create parent dirs */
1599         create_dir = talloc_strdup(ctx, "/");
1600         if (!create_dir) {
1601                 return PAM_BUF_ERR;
1602         }
1603
1604         /* find final directory */
1605         user_dir = strrchr(pwd->pw_dir, '/');
1606         if (!user_dir) {
1607                 return PAM_BUF_ERR;
1608         }
1609         user_dir++;
1610
1611         _pam_log(ctx, LOG_DEBUG, "final directory: %s", user_dir);
1612
1613         p = pwd->pw_dir;
1614
1615         while ((token = strtok_r(p, "/", &safe_ptr)) != NULL) {
1616
1617                 mode = 0755;
1618
1619                 p = NULL;
1620
1621                 _pam_log_debug(ctx, LOG_DEBUG, "token is %s", token);
1622
1623                 create_dir = talloc_asprintf_append(create_dir, "%s/", token);
1624                 if (!create_dir) {
1625                         return PAM_BUF_ERR;
1626                 }
1627                 _pam_log_debug(ctx, LOG_DEBUG, "current_dir is %s", create_dir);
1628
1629                 if (strcmp(token, user_dir) == 0) {
1630                         _pam_log_debug(ctx, LOG_DEBUG, "assuming last directory: %s", token);
1631                         mode = 0700;
1632                 }
1633
1634                 ret = _pam_create_homedir(ctx, create_dir, mode);
1635                 if (ret) {
1636                         return ret;
1637                 }
1638         }
1639
1640         return _pam_chown_homedir(ctx, create_dir,
1641                                   pwd->pw_uid,
1642                                   pwd->pw_gid);
1643 }
1644
1645 /* talk to winbindd */
1646 static int winbind_auth_request(struct pwb_context *ctx,
1647                                 const char *user,
1648                                 const char *pass,
1649                                 const char *member,
1650                                 const char *cctype,
1651                                 const int warn_pwd_expire,
1652                                 struct wbcAuthErrorInfo **p_error,
1653                                 struct wbcLogonUserInfo **p_info,
1654                                 struct wbcUserPasswordPolicyInfo **p_policy,
1655                                 time_t *pwd_last_set,
1656                                 char **user_ret)
1657 {
1658         wbcErr wbc_status;
1659
1660         struct wbcLogonUserParams logon;
1661         char membership_of[1024];
1662         uid_t user_uid = -1;
1663         uint32_t flags = WBFLAG_PAM_INFO3_TEXT |
1664                          WBFLAG_PAM_GET_PWD_POLICY;
1665
1666         struct wbcLogonUserInfo *info = NULL;
1667         struct wbcAuthUserInfo *user_info = NULL;
1668         struct wbcAuthErrorInfo *error = NULL;
1669         struct wbcUserPasswordPolicyInfo *policy = NULL;
1670
1671         int ret = PAM_AUTH_ERR;
1672         int i;
1673         const char *codes[] = {
1674                 "NT_STATUS_PASSWORD_EXPIRED",
1675                 "NT_STATUS_PASSWORD_MUST_CHANGE",
1676                 "NT_STATUS_INVALID_WORKSTATION",
1677                 "NT_STATUS_INVALID_LOGON_HOURS",
1678                 "NT_STATUS_ACCOUNT_EXPIRED",
1679                 "NT_STATUS_ACCOUNT_DISABLED",
1680                 "NT_STATUS_ACCOUNT_LOCKED_OUT",
1681                 "NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
1682                 "NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
1683                 "NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
1684                 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1685                 "NT_STATUS_NO_LOGON_SERVERS",
1686                 "NT_STATUS_WRONG_PASSWORD",
1687                 "NT_STATUS_ACCESS_DENIED"
1688         };
1689
1690         if (pwd_last_set) {
1691                 *pwd_last_set = 0;
1692         }
1693
1694         /* Krb5 auth always has to go against the KDC of the user's realm */
1695
1696         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1697                 flags           |= WBFLAG_PAM_CONTACT_TRUSTDOM;
1698         }
1699
1700         if (ctx->ctrl & (WINBIND_KRB5_AUTH|WINBIND_CACHED_LOGIN)) {
1701                 struct passwd *pwd = NULL;
1702
1703                 pwd = getpwnam(user);
1704                 if (pwd == NULL) {
1705                         return PAM_USER_UNKNOWN;
1706                 }
1707                 user_uid        = pwd->pw_uid;
1708         }
1709
1710         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1711
1712                 _pam_log_debug(ctx, LOG_DEBUG,
1713                                "enabling krb5 login flag\n");
1714
1715                 flags           |= WBFLAG_PAM_KRB5 |
1716                                    WBFLAG_PAM_FALLBACK_AFTER_KRB5;
1717         }
1718
1719         if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1720                 _pam_log_debug(ctx, LOG_DEBUG,
1721                                "enabling cached login flag\n");
1722                 flags           |= WBFLAG_PAM_CACHED_LOGIN;
1723         }
1724
1725         if (user_ret) {
1726                 *user_ret = NULL;
1727                 flags           |= WBFLAG_PAM_UNIX_NAME;
1728         }
1729
1730         if (cctype != NULL) {
1731                 _pam_log_debug(ctx, LOG_DEBUG,
1732                                "enabling request for a %s krb5 ccache\n",
1733                                cctype);
1734         }
1735
1736         if (member != NULL) {
1737
1738                 ZERO_STRUCT(membership_of);
1739
1740                 if (!winbind_name_list_to_sid_string_list(ctx, user, member,
1741                                                           membership_of,
1742                                                           sizeof(membership_of))) {
1743                         _pam_log_debug(ctx, LOG_ERR,
1744                                        "failed to serialize membership of sid "
1745                                        "\"%s\"\n", member);
1746                         return PAM_AUTH_ERR;
1747                 }
1748         }
1749
1750         ZERO_STRUCT(logon);
1751
1752         logon.username                  = user;
1753         logon.password                  = pass;
1754
1755         if (cctype) {
1756                 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1757                                              &logon.blobs,
1758                                              "krb5_cc_type",
1759                                              0,
1760                                              (uint8_t *)cctype,
1761                                              strlen(cctype)+1);
1762                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1763                         goto done;
1764                 }
1765         }
1766
1767         wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1768                                      &logon.blobs,
1769                                      "flags",
1770                                      0,
1771                                      (uint8_t *)&flags,
1772                                      sizeof(flags));
1773         if (!WBC_ERROR_IS_OK(wbc_status)) {
1774                 goto done;
1775         }
1776
1777         wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1778                                      &logon.blobs,
1779                                      "user_uid",
1780                                      0,
1781                                      (uint8_t *)&user_uid,
1782                                      sizeof(user_uid));
1783         if (!WBC_ERROR_IS_OK(wbc_status)) {
1784                 goto done;
1785         }
1786
1787         if (member) {
1788                 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1789                                              &logon.blobs,
1790                                              "membership_of",
1791                                              0,
1792                                              (uint8_t *)membership_of,
1793                                              sizeof(membership_of));
1794                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1795                         goto done;
1796                 }
1797         }
1798
1799         wbc_status = wbcLogonUser(&logon, &info, &error, &policy);
1800         ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1801                                           user, "wbcLogonUser");
1802         wbcFreeMemory(logon.blobs);
1803         logon.blobs = NULL;
1804
1805         if (info && info->info) {
1806                 user_info = info->info;
1807         }
1808
1809         if (pwd_last_set && user_info) {
1810                 *pwd_last_set = user_info->pass_last_set_time;
1811         }
1812
1813         if (p_info && info) {
1814                 *p_info = info;
1815         }
1816
1817         if (p_policy && policy) {
1818                 *p_policy = policy;
1819         }
1820
1821         if (p_error && error) {
1822                 /* We want to process the error in the caller. */
1823                 *p_error = error;
1824                 return ret;
1825         }
1826
1827         for (i=0; i<ARRAY_SIZE(codes); i++) {
1828                 int _ret = ret;
1829                 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1830                         ret = _ret;
1831                         goto done;
1832                 }
1833         }
1834
1835         if ((ret == PAM_SUCCESS) && user_info && policy && info) {
1836
1837                 bool already_expired = false;
1838                 bool change_pwd = false;
1839
1840                 /* warn a user if the password is about to expire soon */
1841                 _pam_warn_password_expiry(ctx, user_info, policy,
1842                                           warn_pwd_expire,
1843                                           &already_expired,
1844                                           &change_pwd);
1845
1846                 if (already_expired == true) {
1847
1848                         SMB_TIME_T last_set = user_info->pass_last_set_time;
1849
1850                         _pam_log_debug(ctx, LOG_DEBUG,
1851                                        "Password has expired "
1852                                        "(Password was last set: %lld, "
1853                                        "the policy says it should expire here "
1854                                        "%lld (now it's: %ld))\n",
1855                                        (long long int)last_set,
1856                                        (long long int)last_set +
1857                                        policy->expire,
1858                                        (long)time(NULL));
1859
1860                         return PAM_AUTHTOK_EXPIRED;
1861                 }
1862
1863                 if (change_pwd) {
1864                         ret = PAM_NEW_AUTHTOK_REQD;
1865                         goto done;
1866                 }
1867
1868                 /* inform about logon type */
1869                 _pam_warn_logon_type(ctx, user, user_info->user_flags);
1870
1871                 /* inform about krb5 failures */
1872                 _pam_warn_krb5_failure(ctx, user, user_info->user_flags);
1873
1874                 /* set some info3 info for other modules in the stack */
1875                 _pam_set_data_info3(ctx, user_info);
1876
1877                 /* put krb5ccname into env */
1878                 _pam_setup_krb5_env(ctx, info);
1879
1880                 /* If winbindd returned a username, return the pointer to it
1881                  * here. */
1882                 _pam_setup_unix_username(ctx, user_ret, info);
1883         }
1884
1885  done:
1886         if (logon.blobs) {
1887                 wbcFreeMemory(logon.blobs);
1888         }
1889         if (info && info->blobs && !p_info) {
1890                 wbcFreeMemory(info->blobs);
1891         }
1892         if (error && !p_error) {
1893                 wbcFreeMemory(error);
1894         }
1895         if (info && !p_info) {
1896                 wbcFreeMemory(info);
1897         }
1898         if (policy && !p_policy) {
1899                 wbcFreeMemory(policy);
1900         }
1901
1902         return ret;
1903 }
1904
1905 /* talk to winbindd */
1906 static int winbind_chauthtok_request(struct pwb_context *ctx,
1907                                      const char *user,
1908                                      const char *oldpass,
1909                                      const char *newpass,
1910                                      time_t pwd_last_set)
1911 {
1912         wbcErr wbc_status;
1913         struct wbcChangePasswordParams params;
1914         struct wbcAuthErrorInfo *error = NULL;
1915         struct wbcUserPasswordPolicyInfo *policy = NULL;
1916         enum wbcPasswordChangeRejectReason reject_reason = -1;
1917         uint32_t flags = 0;
1918
1919         int i;
1920         const char *codes[] = {
1921                 "NT_STATUS_BACKUP_CONTROLLER",
1922                 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1923                 "NT_STATUS_NO_LOGON_SERVERS",
1924                 "NT_STATUS_ACCESS_DENIED",
1925                 "NT_STATUS_PWD_TOO_SHORT", /* TODO: tell the min pwd length ? */
1926                 "NT_STATUS_PWD_TOO_RECENT", /* TODO: tell the minage ? */
1927                 "NT_STATUS_PWD_HISTORY_CONFLICT" /* TODO: tell the history length ? */
1928         };
1929         int ret = PAM_AUTH_ERR;
1930
1931         ZERO_STRUCT(params);
1932
1933         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1934                 flags |= WBFLAG_PAM_KRB5 |
1935                          WBFLAG_PAM_CONTACT_TRUSTDOM;
1936         }
1937
1938         if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1939                 flags |= WBFLAG_PAM_CACHED_LOGIN;
1940         }
1941
1942         params.account_name             = user;
1943         params.level                    = WBC_AUTH_USER_LEVEL_PLAIN;
1944         params.old_password.plaintext   = oldpass;
1945         params.new_password.plaintext   = newpass;
1946         params.flags                    = flags;
1947
1948         wbc_status = wbcChangeUserPasswordEx(&params, &error, &reject_reason, &policy);
1949         ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1950                                           user, "wbcChangeUserPasswordEx");
1951
1952         if (WBC_ERROR_IS_OK(wbc_status)) {
1953                 _pam_log(ctx, LOG_NOTICE,
1954                          "user '%s' password changed", user);
1955                 return PAM_SUCCESS;
1956         }
1957
1958         if (!error) {
1959                 wbcFreeMemory(policy);
1960                 return ret;
1961         }
1962
1963         for (i=0; i<ARRAY_SIZE(codes); i++) {
1964                 int _ret = ret;
1965                 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1966                         ret = _ret;
1967                         goto done;
1968                 }
1969         }
1970
1971         if (!strcasecmp(error->nt_string,
1972                         "NT_STATUS_PASSWORD_RESTRICTION")) {
1973
1974                 char *pwd_restriction_string = NULL;
1975                 SMB_TIME_T min_pwd_age = 0;
1976
1977                 if (policy) {
1978                         min_pwd_age     = policy->min_passwordage;
1979                 }
1980
1981                 /* FIXME: avoid to send multiple PAM messages after another */
1982                 switch (reject_reason) {
1983                         case -1:
1984                                 break;
1985                         case WBC_PWD_CHANGE_REJECT_OTHER:
1986                                 if ((min_pwd_age > 0) &&
1987                                     (pwd_last_set + min_pwd_age > time(NULL))) {
1988                                         PAM_WB_REMARK_DIRECT(ctx,
1989                                              "NT_STATUS_PWD_TOO_RECENT");
1990                                 }
1991                                 break;
1992                         case WBC_PWD_CHANGE_REJECT_TOO_SHORT:
1993                                 PAM_WB_REMARK_DIRECT(ctx,
1994                                         "NT_STATUS_PWD_TOO_SHORT");
1995                                 break;
1996                         case WBC_PWD_CHANGE_REJECT_IN_HISTORY:
1997                                 PAM_WB_REMARK_DIRECT(ctx,
1998                                         "NT_STATUS_PWD_HISTORY_CONFLICT");
1999                                 break;
2000                         case WBC_PWD_CHANGE_REJECT_COMPLEXITY:
2001                                 _make_remark(ctx, PAM_ERROR_MSG,
2002                                              _("Password does not meet "
2003                                                "complexity requirements"));
2004                                 break;
2005                         default:
2006                                 _pam_log_debug(ctx, LOG_DEBUG,
2007                                                "unknown password change "
2008                                                "reject reason: %d",
2009                                                reject_reason);
2010                                 break;
2011                 }
2012
2013                 pwd_restriction_string =
2014                         _pam_compose_pwd_restriction_string(ctx, policy);
2015                 if (pwd_restriction_string) {
2016                         _make_remark(ctx, PAM_ERROR_MSG,
2017                                      pwd_restriction_string);
2018                         TALLOC_FREE(pwd_restriction_string);
2019                 }
2020         }
2021  done:
2022         wbcFreeMemory(error);
2023         wbcFreeMemory(policy);
2024
2025         return ret;
2026 }
2027
2028 /*
2029  * Checks if a user has an account
2030  *
2031  * return values:
2032  *       1  = User not found
2033  *       0  = OK
2034  *      -1  = System error
2035  */
2036 static int valid_user(struct pwb_context *ctx,
2037                       const char *user)
2038 {
2039         /* check not only if the user is available over NSS calls, also make
2040          * sure it's really a winbind user, this is important when stacking PAM
2041          * modules in the 'account' or 'password' facility. */
2042
2043         wbcErr wbc_status;
2044         struct passwd *pwd = NULL;
2045         struct passwd *wb_pwd = NULL;
2046
2047         pwd = getpwnam(user);
2048         if (pwd == NULL) {
2049                 return 1;
2050         }
2051
2052         wbc_status = wbcGetpwnam(user, &wb_pwd);
2053         wbcFreeMemory(wb_pwd);
2054         if (!WBC_ERROR_IS_OK(wbc_status)) {
2055                 _pam_log(ctx, LOG_DEBUG, "valid_user: wbcGetpwnam gave %s\n",
2056                         wbcErrorString(wbc_status));
2057         }
2058
2059         switch (wbc_status) {
2060                 case WBC_ERR_UNKNOWN_USER:
2061                         return 1;
2062                 case WBC_ERR_SUCCESS:
2063                         return 0;
2064                 default:
2065                         break;
2066         }
2067         return -1;
2068 }
2069
2070 static char *_pam_delete(register char *xx)
2071 {
2072         _pam_overwrite(xx);
2073         _pam_drop(xx);
2074         return NULL;
2075 }
2076
2077 /*
2078  * obtain a password from the user
2079  */
2080
2081 static int _winbind_read_password(struct pwb_context *ctx,
2082                                   unsigned int ctrl,
2083                                   const char *comment,
2084                                   const char *prompt1,
2085                                   const char *prompt2,
2086                                   const char **pass)
2087 {
2088         int authtok_flag;
2089         int retval;
2090         const char *item;
2091         char *token;
2092
2093         _pam_log(ctx, LOG_DEBUG, "getting password (0x%08x)", ctrl);
2094
2095         /*
2096          * make sure nothing inappropriate gets returned
2097          */
2098
2099         *pass = token = NULL;
2100
2101         /*
2102          * which authentication token are we getting?
2103          */
2104
2105         if (on(WINBIND__OLD_PASSWORD, ctrl)) {
2106                 authtok_flag = PAM_OLDAUTHTOK;
2107         } else {
2108                 authtok_flag = PAM_AUTHTOK;
2109         }
2110
2111         /*
2112          * should we obtain the password from a PAM item ?
2113          */
2114
2115         if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) ||
2116             on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2117                 retval = _pam_get_item(ctx->pamh, authtok_flag, &item);
2118                 if (retval != PAM_SUCCESS) {
2119                         /* very strange. */
2120                         _pam_log(ctx, LOG_ALERT,
2121                                  "pam_get_item returned error "
2122                                  "to unix-read-password");
2123                         return retval;
2124                 } else if (item != NULL) {      /* we have a password! */
2125                         *pass = item;
2126                         item = NULL;
2127                         _pam_log(ctx, LOG_DEBUG,
2128                                  "pam_get_item returned a password");
2129                         return PAM_SUCCESS;
2130                 } else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2131                         return PAM_AUTHTOK_RECOVER_ERR; /* didn't work */
2132                 } else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl)
2133                            && off(WINBIND__OLD_PASSWORD, ctrl)) {
2134                         return PAM_AUTHTOK_RECOVER_ERR;
2135                 }
2136         }
2137         /*
2138          * getting here implies we will have to get the password from the
2139          * user directly.
2140          */
2141
2142         {
2143                 struct pam_message msg[3], *pmsg[3];
2144                 struct pam_response *resp;
2145                 int i, replies;
2146
2147                 /* prepare to converse */
2148
2149                 if (comment != NULL && off(ctrl, WINBIND_SILENT)) {
2150                         pmsg[0] = &msg[0];
2151                         msg[0].msg_style = PAM_TEXT_INFO;
2152                         msg[0].msg = discard_const_p(char, comment);
2153                         i = 1;
2154                 } else {
2155                         i = 0;
2156                 }
2157
2158                 pmsg[i] = &msg[i];
2159                 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2160                 msg[i++].msg = discard_const_p(char, prompt1);
2161                 replies = 1;
2162
2163                 if (prompt2 != NULL) {
2164                         pmsg[i] = &msg[i];
2165                         msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2166                         msg[i++].msg = discard_const_p(char, prompt2);
2167                         ++replies;
2168                 }
2169                 /* so call the conversation expecting i responses */
2170                 resp = NULL;
2171                 retval = converse(ctx->pamh, i, pmsg, &resp);
2172                 if (resp == NULL) {
2173                         if (retval == PAM_SUCCESS) {
2174                                 retval = PAM_AUTHTOK_RECOVER_ERR;
2175                         }
2176                         goto done;
2177                 }
2178                 if (retval != PAM_SUCCESS) {
2179                         _pam_drop_reply(resp, i);
2180                         goto done;
2181                 }
2182
2183                 /* interpret the response */
2184
2185                 token = x_strdup(resp[i - replies].resp);
2186                 if (!token) {
2187                         _pam_log(ctx, LOG_NOTICE,
2188                                  "could not recover "
2189                                  "authentication token");
2190                         retval = PAM_AUTHTOK_RECOVER_ERR;
2191                         goto done;
2192                 }
2193
2194                 if (replies == 2) {
2195                         /* verify that password entered correctly */
2196                         if (!resp[i - 1].resp ||
2197                             strcmp(token, resp[i - 1].resp)) {
2198                                 _pam_delete(token);     /* mistyped */
2199                                 retval = PAM_AUTHTOK_RECOVER_ERR;
2200                                 _make_remark(ctx, PAM_ERROR_MSG,
2201                                              MISTYPED_PASS);
2202                         }
2203                 }
2204
2205                 /*
2206                  * tidy up the conversation (resp_retcode) is ignored
2207                  * -- what is it for anyway? AGM
2208                  */
2209                 _pam_drop_reply(resp, i);
2210         }
2211
2212  done:
2213         if (retval != PAM_SUCCESS) {
2214                 _pam_log_debug(ctx, LOG_DEBUG,
2215                                "unable to obtain a password");
2216                 return retval;
2217         }
2218         /* 'token' is the entered password */
2219
2220         /* we store this password as an item */
2221
2222         retval = pam_set_item(ctx->pamh, authtok_flag, token);
2223         _pam_delete(token);     /* clean it up */
2224         if (retval != PAM_SUCCESS ||
2225             (retval = _pam_get_item(ctx->pamh, authtok_flag, &item)) != PAM_SUCCESS) {
2226
2227                 _pam_log(ctx, LOG_CRIT, "error manipulating password");
2228                 return retval;
2229
2230         }
2231
2232         *pass = item;
2233         item = NULL;            /* break link to password */
2234
2235         return PAM_SUCCESS;
2236 }
2237
2238 static const char *get_conf_item_string(struct pwb_context *ctx,
2239                                         const char *item,
2240                                         int config_flag)
2241 {
2242         int i = 0;
2243         const char *parm_opt = NULL;
2244
2245         if (!(ctx->ctrl & config_flag)) {
2246                 goto out;
2247         }
2248
2249         /* let the pam opt take precedence over the pam_winbind.conf option */
2250         for (i=0; i<ctx->argc; i++) {
2251
2252                 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2253                         char *p;
2254
2255                         if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2256                                 _pam_log(ctx, LOG_INFO,
2257                                          "no \"=\" delimiter for \"%s\" found\n",
2258                                          item);
2259                                 goto out;
2260                         }
2261                         _pam_log_debug(ctx, LOG_INFO,
2262                                        "PAM config: %s '%s'\n", item, p+1);
2263                         return p + 1;
2264                 }
2265         }
2266
2267         if (ctx->dict) {
2268                 char *key = NULL;
2269
2270                 key = talloc_asprintf(ctx, "global:%s", item);
2271                 if (!key) {
2272                         goto out;
2273                 }
2274
2275                 parm_opt = iniparser_getstr(ctx->dict, key);
2276                 TALLOC_FREE(key);
2277
2278                 _pam_log_debug(ctx, LOG_INFO, "CONFIG file: %s '%s'\n",
2279                                item, parm_opt);
2280         }
2281 out:
2282         return parm_opt;
2283 }
2284
2285 static int get_config_item_int(struct pwb_context *ctx,
2286                                const char *item,
2287                                int config_flag)
2288 {
2289         int i, parm_opt = -1;
2290
2291         if (!(ctx->ctrl & config_flag)) {
2292                 goto out;
2293         }
2294
2295         /* let the pam opt take precedence over the pam_winbind.conf option */
2296         for (i = 0; i < ctx->argc; i++) {
2297
2298                 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2299                         char *p;
2300
2301                         if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2302                                 _pam_log(ctx, LOG_INFO,
2303                                          "no \"=\" delimiter for \"%s\" found\n",
2304                                          item);
2305                                 goto out;
2306                         }
2307                         parm_opt = atoi(p + 1);
2308                         _pam_log_debug(ctx, LOG_INFO,
2309                                        "PAM config: %s '%d'\n",
2310                                        item, parm_opt);
2311                         return parm_opt;
2312                 }
2313         }
2314
2315         if (ctx->dict) {
2316                 char *key = NULL;
2317
2318                 key = talloc_asprintf(ctx, "global:%s", item);
2319                 if (!key) {
2320                         goto out;
2321                 }
2322
2323                 parm_opt = iniparser_getint(ctx->dict, key, -1);
2324                 TALLOC_FREE(key);
2325
2326                 _pam_log_debug(ctx, LOG_INFO,
2327                                "CONFIG file: %s '%d'\n",
2328                                item, parm_opt);
2329         }
2330 out:
2331         return parm_opt;
2332 }
2333
2334 static const char *get_krb5_cc_type_from_config(struct pwb_context *ctx)
2335 {
2336         return get_conf_item_string(ctx, "krb5_ccache_type",
2337                                     WINBIND_KRB5_CCACHE_TYPE);
2338 }
2339
2340 static const char *get_member_from_config(struct pwb_context *ctx)
2341 {
2342         const char *ret = NULL;
2343         ret = get_conf_item_string(ctx, "require_membership_of",
2344                                    WINBIND_REQUIRED_MEMBERSHIP);
2345         if (ret) {
2346                 return ret;
2347         }
2348         return get_conf_item_string(ctx, "require-membership-of",
2349                                     WINBIND_REQUIRED_MEMBERSHIP);
2350 }
2351
2352 static int get_warn_pwd_expire_from_config(struct pwb_context *ctx)
2353 {
2354         int ret;
2355         ret = get_config_item_int(ctx, "warn_pwd_expire",
2356                                   WINBIND_WARN_PWD_EXPIRE);
2357         /* no or broken setting */
2358         if (ret <= 0) {
2359                 return DEFAULT_DAYS_TO_WARN_BEFORE_PWD_EXPIRES;
2360         }
2361         return ret;
2362 }
2363
2364 /**
2365  * Retrieve the winbind separator.
2366  *
2367  * @param ctx PAM winbind context.
2368  *
2369  * @return string separator character. NULL on failure.
2370  */
2371
2372 static char winbind_get_separator(struct pwb_context *ctx)
2373 {
2374         wbcErr wbc_status;
2375         static struct wbcInterfaceDetails *details = NULL;
2376
2377         wbc_status = wbcInterfaceDetails(&details);
2378         if (!WBC_ERROR_IS_OK(wbc_status)) {
2379                 _pam_log(ctx, LOG_ERR,
2380                          "Could not retrieve winbind interface details: %s",
2381                          wbcErrorString(wbc_status));
2382                 return '\0';
2383         }
2384
2385         if (!details) {
2386                 return '\0';
2387         }
2388
2389         return details->winbind_separator;
2390 }
2391
2392
2393 /**
2394  * Convert a upn to a name.
2395  *
2396  * @param ctx PAM winbind context.
2397  * @param upn  USer UPN to be trabslated.
2398  *
2399  * @return converted name. NULL pointer on failure. Caller needs to free.
2400  */
2401
2402 static char* winbind_upn_to_username(struct pwb_context *ctx,
2403                                      const char *upn)
2404 {
2405         char sep;
2406         wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;
2407         struct wbcDomainSid sid;
2408         enum wbcSidType type;
2409         char *domain;
2410         char *name;
2411         char *p;
2412
2413         /* This cannot work when the winbind separator = @ */
2414
2415         sep = winbind_get_separator(ctx);
2416         if (!sep || sep == '@') {
2417                 return NULL;
2418         }
2419
2420         name = talloc_strdup(ctx, upn);
2421         if (!name) {
2422                 return NULL;
2423         }
2424         if ((p = strchr(name, '@')) != NULL) {
2425                 *p = 0;
2426                 domain = p + 1;
2427         }
2428
2429         /* Convert the UPN to a SID */
2430
2431         wbc_status = wbcLookupName(domain, name, &sid, &type);
2432         if (!WBC_ERROR_IS_OK(wbc_status)) {
2433                 return NULL;
2434         }
2435
2436         /* Convert the the SID back to the sAMAccountName */
2437
2438         wbc_status = wbcLookupSid(&sid, &domain, &name, &type);
2439         if (!WBC_ERROR_IS_OK(wbc_status)) {
2440                 return NULL;
2441         }
2442
2443         return talloc_asprintf(ctx, "%s\\%s", domain, name);
2444 }
2445
2446 static int _pam_delete_cred(pam_handle_t *pamh, int flags,
2447                          int argc, const char **argv)
2448 {
2449         int retval = PAM_SUCCESS;
2450         struct pwb_context *ctx = NULL;
2451         struct wbcLogoffUserParams logoff;
2452         struct wbcAuthErrorInfo *error = NULL;
2453         const char *user;
2454         wbcErr wbc_status = WBC_ERR_SUCCESS;
2455
2456         ZERO_STRUCT(logoff);
2457
2458         retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2459         if (retval) {
2460                 goto out;
2461         }
2462
2463         _PAM_LOG_FUNCTION_ENTER("_pam_delete_cred", ctx);
2464
2465         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
2466
2467                 /* destroy the ccache here */
2468
2469                 uint32_t wbc_flags = 0;
2470                 const char *ccname = NULL;
2471                 struct passwd *pwd = NULL;
2472
2473                 retval = pam_get_user(pamh, &user, _("Username: "));
2474                 if (retval) {
2475                         _pam_log(ctx, LOG_ERR,
2476                                  "could not identify user");
2477                         goto out;
2478                 }
2479
2480                 if (user == NULL) {
2481                         _pam_log(ctx, LOG_ERR,
2482                                  "username was NULL!");
2483                         retval = PAM_USER_UNKNOWN;
2484                         goto out;
2485                 }
2486
2487                 _pam_log_debug(ctx, LOG_DEBUG,
2488                                "username [%s] obtained", user);
2489
2490                 ccname = pam_getenv(pamh, "KRB5CCNAME");
2491                 if (ccname == NULL) {
2492                         _pam_log_debug(ctx, LOG_DEBUG,
2493                                        "user has no KRB5CCNAME environment");
2494                 }
2495
2496                 pwd = getpwnam(user);
2497                 if (pwd == NULL) {
2498                         retval = PAM_USER_UNKNOWN;
2499                         goto out;
2500                 }
2501
2502                 wbc_flags = WBFLAG_PAM_KRB5 |
2503                         WBFLAG_PAM_CONTACT_TRUSTDOM;
2504
2505                 logoff.username         = user;
2506
2507                 if (ccname) {
2508                         wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2509                                                      &logoff.blobs,
2510                                                      "ccfilename",
2511                                                      0,
2512                                                      (uint8_t *)ccname,
2513                                                      strlen(ccname)+1);
2514                         if (!WBC_ERROR_IS_OK(wbc_status)) {
2515                                 goto out;
2516                         }
2517                 }
2518
2519                 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2520                                              &logoff.blobs,
2521                                              "flags",
2522                                              0,
2523                                              (uint8_t *)&wbc_flags,
2524                                              sizeof(wbc_flags));
2525                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2526                         goto out;
2527                 }
2528
2529                 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2530                                              &logoff.blobs,
2531                                              "user_uid",
2532                                              0,
2533                                              (uint8_t *)&pwd->pw_uid,
2534                                              sizeof(pwd->pw_uid));
2535                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2536                         goto out;
2537                 }
2538
2539                 wbc_status = wbcLogoffUserEx(&logoff, &error);
2540                 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2541                                                      user, "wbcLogoffUser");
2542                 wbcFreeMemory(error);
2543                 wbcFreeMemory(logoff.blobs);
2544                 logoff.blobs = NULL;
2545
2546                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2547                         _pam_log(ctx, LOG_INFO,
2548                                  "failed to logoff user %s: %s\n",
2549                                          user, wbcErrorString(wbc_status));
2550                 }
2551         }
2552
2553 out:
2554         if (logoff.blobs) {
2555                 wbcFreeMemory(logoff.blobs);
2556         }
2557
2558         if (!WBC_ERROR_IS_OK(wbc_status)) {
2559                 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2560                      user, "wbcLogoffUser");
2561         }
2562
2563         /*
2564          * Delete the krb5 ccname variable from the PAM environment
2565          * if it was set by winbind.
2566          */
2567         if ((ctx->ctrl & WINBIND_KRB5_AUTH) && pam_getenv(pamh, "KRB5CCNAME")) {
2568                 pam_putenv(pamh, "KRB5CCNAME");
2569         }
2570
2571         _PAM_LOG_FUNCTION_LEAVE("_pam_delete_cred", ctx, retval);
2572
2573         TALLOC_FREE(ctx);
2574
2575         return retval;
2576 }
2577
2578 PAM_EXTERN
2579 int pam_sm_authenticate(pam_handle_t *pamh, int flags,
2580                         int argc, const char **argv)
2581 {
2582         const char *username;
2583         const char *password;
2584         const char *member = NULL;
2585         const char *cctype = NULL;
2586         int warn_pwd_expire;
2587         int retval = PAM_AUTH_ERR;
2588         char *username_ret = NULL;
2589         char *new_authtok_required = NULL;
2590         char *real_username = NULL;
2591         struct pwb_context *ctx = NULL;
2592
2593         retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2594         if (retval) {
2595                 goto out;
2596         }
2597
2598         _PAM_LOG_FUNCTION_ENTER("pam_sm_authenticate", ctx);
2599
2600         /* Get the username */
2601         retval = pam_get_user(pamh, &username, NULL);
2602         if ((retval != PAM_SUCCESS) || (!username)) {
2603                 _pam_log_debug(ctx, LOG_DEBUG,
2604                                "can not get the username");
2605                 retval = PAM_SERVICE_ERR;
2606                 goto out;
2607         }
2608
2609
2610 #if defined(AIX)
2611         /* Decode the user name since AIX does not support logn user
2612            names by default.  The name is encoded as _#uid.  */
2613
2614         if (username[0] == '_') {
2615                 uid_t id = atoi(&username[1]);
2616                 struct passwd *pw = NULL;
2617
2618                 if ((id!=0) && ((pw = getpwuid(id)) != NULL)) {
2619                         real_username = strdup(pw->pw_name);
2620                 }
2621         }
2622 #endif
2623
2624         if (!real_username) {
2625                 /* Just making a copy of the username we got from PAM */
2626                 if ((real_username = strdup(username)) == NULL) {
2627                         _pam_log_debug(ctx, LOG_DEBUG,
2628                                        "memory allocation failure when copying "
2629                                        "username");
2630                         retval = PAM_SERVICE_ERR;
2631                         goto out;
2632                 }
2633         }
2634
2635         /* Maybe this was a UPN */
2636
2637         if (strchr(real_username, '@') != NULL) {
2638                 char *samaccountname = NULL;
2639
2640                 samaccountname = winbind_upn_to_username(ctx,
2641                                                          real_username);
2642                 if (samaccountname) {
2643                         free(real_username);
2644                         real_username = strdup(samaccountname);
2645                 }
2646         }
2647
2648         retval = _winbind_read_password(ctx, ctx->ctrl, NULL,
2649                                         _("Password: "), NULL,
2650                                         &password);
2651
2652         if (retval != PAM_SUCCESS) {
2653                 _pam_log(ctx, LOG_ERR,
2654                          "Could not retrieve user's password");
2655                 retval = PAM_AUTHTOK_ERR;
2656                 goto out;
2657         }
2658
2659         /* Let's not give too much away in the log file */
2660
2661 #ifdef DEBUG_PASSWORD
2662         _pam_log_debug(ctx, LOG_INFO,
2663                        "Verify user '%s' with password '%s'",
2664                        real_username, password);
2665 #else
2666         _pam_log_debug(ctx, LOG_INFO,
2667                        "Verify user '%s'", real_username);
2668 #endif
2669
2670         member = get_member_from_config(ctx);
2671         cctype = get_krb5_cc_type_from_config(ctx);
2672         warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
2673
2674         /* Now use the username to look up password */
2675         retval = winbind_auth_request(ctx, real_username, password,
2676                                       member, cctype, warn_pwd_expire,
2677                                       NULL, NULL, NULL,
2678                                       NULL, &username_ret);
2679
2680         if (retval == PAM_NEW_AUTHTOK_REQD ||
2681             retval == PAM_AUTHTOK_EXPIRED) {
2682
2683                 char *new_authtok_required_during_auth = NULL;
2684
2685                 new_authtok_required = talloc_asprintf(NULL, "%d", retval);
2686                 if (!new_authtok_required) {
2687                         retval = PAM_BUF_ERR;
2688                         goto out;
2689                 }
2690
2691                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2692                              new_authtok_required,
2693                              _pam_winbind_cleanup_func);
2694
2695                 retval = PAM_SUCCESS;
2696
2697                 new_authtok_required_during_auth = talloc_asprintf(NULL, "%d", true);
2698                 if (!new_authtok_required_during_auth) {
2699                         retval = PAM_BUF_ERR;
2700                         goto out;
2701                 }
2702
2703                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2704                              new_authtok_required_during_auth,
2705                              _pam_winbind_cleanup_func);
2706
2707                 goto out;
2708         }
2709
2710 out:
2711         if (username_ret) {
2712                 pam_set_item (pamh, PAM_USER, username_ret);
2713                 _pam_log_debug(ctx, LOG_INFO,
2714                                "Returned user was '%s'", username_ret);
2715                 free(username_ret);
2716         }
2717
2718         if (real_username) {
2719                 free(real_username);
2720         }
2721
2722         if (!new_authtok_required) {
2723                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, NULL, NULL);
2724         }
2725
2726         if (retval != PAM_SUCCESS) {
2727                 _pam_free_data_info3(pamh);
2728         }
2729
2730         _PAM_LOG_FUNCTION_LEAVE("pam_sm_authenticate", ctx, retval);
2731
2732         TALLOC_FREE(ctx);
2733
2734         return retval;
2735 }
2736
2737 PAM_EXTERN
2738 int pam_sm_setcred(pam_handle_t *pamh, int flags,
2739                    int argc, const char **argv)
2740 {
2741         int ret = PAM_SYSTEM_ERR;
2742         struct pwb_context *ctx = NULL;
2743
2744         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2745         if (ret) {
2746                 goto out;
2747         }
2748
2749         _PAM_LOG_FUNCTION_ENTER("pam_sm_setcred", ctx);
2750
2751         switch (flags & ~PAM_SILENT) {
2752
2753                 case PAM_DELETE_CRED:
2754                         ret = _pam_delete_cred(pamh, flags, argc, argv);
2755                         break;
2756                 case PAM_REFRESH_CRED:
2757                         _pam_log_debug(ctx, LOG_WARNING,
2758                                        "PAM_REFRESH_CRED not implemented");
2759                         ret = PAM_SUCCESS;
2760                         break;
2761                 case PAM_REINITIALIZE_CRED:
2762                         _pam_log_debug(ctx, LOG_WARNING,
2763                                        "PAM_REINITIALIZE_CRED not implemented");
2764                         ret = PAM_SUCCESS;
2765                         break;
2766                 case PAM_ESTABLISH_CRED:
2767                         _pam_log_debug(ctx, LOG_WARNING,
2768                                        "PAM_ESTABLISH_CRED not implemented");
2769                         ret = PAM_SUCCESS;
2770                         break;
2771                 default:
2772                         ret = PAM_SYSTEM_ERR;
2773                         break;
2774         }
2775
2776  out:
2777
2778         _PAM_LOG_FUNCTION_LEAVE("pam_sm_setcred", ctx, ret);
2779
2780         TALLOC_FREE(ctx);
2781
2782         return ret;
2783 }
2784
2785 /*
2786  * Account management. We want to verify that the account exists
2787  * before returning PAM_SUCCESS
2788  */
2789 PAM_EXTERN
2790 int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
2791                    int argc, const char **argv)
2792 {
2793         const char *username;
2794         int ret = PAM_USER_UNKNOWN;
2795         void *tmp = NULL;
2796         struct pwb_context *ctx = NULL;
2797
2798         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2799         if (ret) {
2800                 goto out;
2801         }
2802
2803         _PAM_LOG_FUNCTION_ENTER("pam_sm_acct_mgmt", ctx);
2804
2805
2806         /* Get the username */
2807         ret = pam_get_user(pamh, &username, NULL);
2808         if ((ret != PAM_SUCCESS) || (!username)) {
2809                 _pam_log_debug(ctx, LOG_DEBUG,
2810                                "can not get the username");
2811                 ret = PAM_SERVICE_ERR;
2812                 goto out;
2813         }
2814
2815         /* Verify the username */
2816         ret = valid_user(ctx, username);
2817         switch (ret) {
2818         case -1:
2819                 /* some sort of system error. The log was already printed */
2820                 ret = PAM_SERVICE_ERR;
2821                 goto out;
2822         case 1:
2823                 /* the user does not exist */
2824                 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
2825                                username);
2826                 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
2827                         ret = PAM_IGNORE;
2828                         goto out;
2829                 }
2830                 ret = PAM_USER_UNKNOWN;
2831                 goto out;
2832         case 0:
2833                 pam_get_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2834                              (const void **)&tmp);
2835                 if (tmp != NULL) {
2836                         ret = atoi((const char *)tmp);
2837                         switch (ret) {
2838                         case PAM_AUTHTOK_EXPIRED:
2839                                 /* fall through, since new token is required in this case */
2840                         case PAM_NEW_AUTHTOK_REQD:
2841                                 _pam_log(ctx, LOG_WARNING,
2842                                          "pam_sm_acct_mgmt success but %s is set",
2843                                          PAM_WINBIND_NEW_AUTHTOK_REQD);
2844                                 _pam_log(ctx, LOG_NOTICE,
2845                                          "user '%s' needs new password",
2846                                          username);
2847                                 /* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */
2848                                 ret = PAM_NEW_AUTHTOK_REQD;
2849                                 goto out;
2850                         default:
2851                                 _pam_log(ctx, LOG_WARNING,
2852                                          "pam_sm_acct_mgmt success");
2853                                 _pam_log(ctx, LOG_NOTICE,
2854                                          "user '%s' granted access", username);
2855                                 ret = PAM_SUCCESS;
2856                                 goto out;
2857                         }
2858                 }
2859
2860                 /* Otherwise, the authentication looked good */
2861                 _pam_log(ctx, LOG_NOTICE,
2862                          "user '%s' granted access", username);
2863                 ret = PAM_SUCCESS;
2864                 goto out;
2865         default:
2866                 /* we don't know anything about this return value */
2867                 _pam_log(ctx, LOG_ERR,
2868                          "internal module error (ret = %d, user = '%s')",
2869                          ret, username);
2870                 ret = PAM_SERVICE_ERR;
2871                 goto out;
2872         }
2873
2874         /* should not be reached */
2875         ret = PAM_IGNORE;
2876
2877  out:
2878
2879         _PAM_LOG_FUNCTION_LEAVE("pam_sm_acct_mgmt", ctx, ret);
2880
2881         TALLOC_FREE(ctx);
2882
2883         return ret;
2884 }
2885
2886 PAM_EXTERN
2887 int pam_sm_open_session(pam_handle_t *pamh, int flags,
2888                         int argc, const char **argv)
2889 {
2890         int ret = PAM_SUCCESS;
2891         struct pwb_context *ctx = NULL;
2892
2893         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2894         if (ret) {
2895                 goto out;
2896         }
2897
2898         _PAM_LOG_FUNCTION_ENTER("pam_sm_open_session", ctx);
2899
2900         if (ctx->ctrl & WINBIND_MKHOMEDIR) {
2901                 /* check and create homedir */
2902                 ret = _pam_mkhomedir(ctx);
2903         }
2904  out:
2905         _PAM_LOG_FUNCTION_LEAVE("pam_sm_open_session", ctx, ret);
2906
2907         TALLOC_FREE(ctx);
2908
2909         return ret;
2910 }
2911
2912 PAM_EXTERN
2913 int pam_sm_close_session(pam_handle_t *pamh, int flags,
2914                          int argc, const char **argv)
2915 {
2916         int ret = PAM_SUCCESS;
2917         struct pwb_context *ctx = NULL;
2918
2919         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2920         if (ret) {
2921                 goto out;
2922         }
2923
2924         _PAM_LOG_FUNCTION_ENTER("pam_sm_close_session", ctx);
2925
2926 out:
2927         _PAM_LOG_FUNCTION_LEAVE("pam_sm_close_session", ctx, ret);
2928
2929         TALLOC_FREE(ctx);
2930
2931         return ret;
2932 }
2933
2934 /**
2935  * evaluate whether we need to re-authenticate with kerberos after a
2936  * password change
2937  *
2938  * @param ctx PAM winbind context.
2939  * @param user The username
2940  *
2941  * @return boolean Returns true if required, false if not.
2942  */
2943
2944 static bool _pam_require_krb5_auth_after_chauthtok(struct pwb_context *ctx,
2945                                                    const char *user)
2946 {
2947
2948         /* Make sure that we only do this if a) the chauthtok got initiated
2949          * during a logon attempt (authenticate->acct_mgmt->chauthtok) b) any
2950          * later password change via the "passwd" command if done by the user
2951          * itself
2952          * NB. If we login from gdm or xdm and the password expires,
2953          * we change the password, but there is no memory cache.
2954          * Thus, even for passthrough login, we should do the
2955          * authentication again to update memory cache.
2956          * --- BoYang
2957          * */
2958
2959         char *new_authtok_reqd_during_auth = NULL;
2960         struct passwd *pwd = NULL;
2961
2962         _pam_get_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2963                       &new_authtok_reqd_during_auth);
2964         pam_set_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2965                      NULL, NULL);
2966
2967         if (new_authtok_reqd_during_auth) {
2968                 return true;
2969         }
2970
2971         pwd = getpwnam(user);
2972         if (!pwd) {
2973                 return false;
2974         }
2975
2976         if (getuid() == pwd->pw_uid) {
2977                 return true;
2978         }
2979
2980         return false;
2981 }
2982
2983
2984 PAM_EXTERN
2985 int pam_sm_chauthtok(pam_handle_t * pamh, int flags,
2986                      int argc, const char **argv)
2987 {
2988         unsigned int lctrl;
2989         int ret;
2990         bool cached_login = false;
2991
2992         /* <DO NOT free() THESE> */
2993         const char *user;
2994         char *pass_old, *pass_new;
2995         /* </DO NOT free() THESE> */
2996
2997         char *Announce;
2998
2999         int retry = 0;
3000         char *username_ret = NULL;
3001         struct wbcAuthErrorInfo *error = NULL;
3002         struct pwb_context *ctx = NULL;
3003
3004         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
3005         if (ret) {
3006                 goto out;
3007         }
3008
3009         _PAM_LOG_FUNCTION_ENTER("pam_sm_chauthtok", ctx);
3010
3011         cached_login = (ctx->ctrl & WINBIND_CACHED_LOGIN);
3012
3013         /* clearing offline bit for auth */
3014         ctx->ctrl &= ~WINBIND_CACHED_LOGIN;
3015
3016         /*
3017          * First get the name of a user
3018          */
3019         ret = pam_get_user(pamh, &user, _("Username: "));
3020         if (ret) {
3021                 _pam_log(ctx, LOG_ERR,
3022                          "password - could not identify user");
3023                 goto out;
3024         }
3025
3026         if (user == NULL) {
3027                 _pam_log(ctx, LOG_ERR, "username was NULL!");
3028                 ret = PAM_USER_UNKNOWN;
3029                 goto out;
3030         }
3031
3032         _pam_log_debug(ctx, LOG_DEBUG, "username [%s] obtained", user);
3033
3034         /* check if this is really a user in winbindd, not only in NSS */
3035         ret = valid_user(ctx, user);
3036         switch (ret) {
3037                 case 1:
3038                         ret = PAM_USER_UNKNOWN;
3039                         goto out;
3040                 case -1:
3041                         ret = PAM_SYSTEM_ERR;
3042                         goto out;
3043                 default:
3044                         break;
3045         }
3046
3047         /*
3048          * obtain and verify the current password (OLDAUTHTOK) for
3049          * the user.
3050          */
3051
3052         if (flags & PAM_PRELIM_CHECK) {
3053                 time_t pwdlastset_prelim = 0;
3054
3055                 /* instruct user what is happening */
3056
3057 #define greeting _("Changing password for")
3058                 Announce = talloc_asprintf(ctx, "%s %s", greeting, user);
3059                 if (!Announce) {
3060                         _pam_log(ctx, LOG_CRIT,
3061                                  "password - out of memory");
3062                         ret = PAM_BUF_ERR;
3063                         goto out;
3064                 }
3065 #undef greeting
3066
3067                 lctrl = ctx->ctrl | WINBIND__OLD_PASSWORD;
3068                 ret = _winbind_read_password(ctx, lctrl,
3069                                                 Announce,
3070                                                 _("(current) NT password: "),
3071                                                 NULL,
3072                                                 (const char **) &pass_old);
3073                 TALLOC_FREE(Announce);
3074                 if (ret != PAM_SUCCESS) {
3075                         _pam_log(ctx, LOG_NOTICE,
3076                                  "password - (old) token not obtained");
3077                         goto out;
3078                 }
3079
3080                 /* verify that this is the password for this user */
3081
3082                 ret = winbind_auth_request(ctx, user, pass_old,
3083                                            NULL, NULL, 0,
3084                                            &error, NULL, NULL,
3085                                            &pwdlastset_prelim, NULL);
3086
3087                 if (ret != PAM_ACCT_EXPIRED &&
3088                     ret != PAM_AUTHTOK_EXPIRED &&
3089                     ret != PAM_NEW_AUTHTOK_REQD &&
3090                     ret != PAM_SUCCESS) {
3091                         pass_old = NULL;
3092                         goto out;
3093                 }
3094
3095                 pam_set_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3096                              (void *)pwdlastset_prelim, NULL);
3097
3098                 ret = pam_set_item(pamh, PAM_OLDAUTHTOK,
3099                                    (const void *) pass_old);
3100                 pass_old = NULL;
3101                 if (ret != PAM_SUCCESS) {
3102                         _pam_log(ctx, LOG_CRIT,
3103                                  "failed to set PAM_OLDAUTHTOK");
3104                 }
3105         } else if (flags & PAM_UPDATE_AUTHTOK) {
3106
3107                 time_t pwdlastset_update = 0;
3108
3109                 /*
3110                  * obtain the proposed password
3111                  */
3112
3113                 /*
3114                  * get the old token back.
3115                  */
3116
3117                 ret = _pam_get_item(pamh, PAM_OLDAUTHTOK, &pass_old);
3118
3119                 if (ret != PAM_SUCCESS) {
3120                         _pam_log(ctx, LOG_NOTICE,
3121                                  "user not authenticated");
3122                         goto out;
3123                 }
3124
3125                 lctrl = ctx->ctrl & ~WINBIND_TRY_FIRST_PASS_ARG;
3126
3127                 if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) {
3128                         lctrl |= WINBIND_USE_FIRST_PASS_ARG;
3129                 }
3130                 retry = 0;
3131                 ret = PAM_AUTHTOK_ERR;
3132                 while ((ret != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) {
3133                         /*
3134                          * use_authtok is to force the use of a previously entered
3135                          * password -- needed for pluggable password strength checking
3136                          */
3137
3138                         ret = _winbind_read_password(ctx, lctrl,
3139                                                      NULL,
3140                                                      _("Enter new NT password: "),
3141                                                      _("Retype new NT password: "),
3142                                                      (const char **)&pass_new);
3143
3144                         if (ret != PAM_SUCCESS) {
3145                                 _pam_log_debug(ctx, LOG_ALERT,
3146                                                "password - "
3147                                                "new password not obtained");
3148                                 pass_old = NULL;/* tidy up */
3149                                 goto out;
3150                         }
3151
3152                         /*
3153                          * At this point we know who the user is and what they
3154                          * propose as their new password. Verify that the new
3155                          * password is acceptable.
3156                          */
3157
3158                         if (pass_new[0] == '\0') {/* "\0" password = NULL */
3159                                 pass_new = NULL;
3160                         }
3161                 }
3162
3163                 /*
3164                  * By reaching here we have approved the passwords and must now
3165                  * rebuild the password database file.
3166                  */
3167                 _pam_get_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3168                               &pwdlastset_update);
3169
3170                 /*
3171                  * if cached creds were enabled, make sure to set the
3172                  * WINBIND_CACHED_LOGIN bit here in order to have winbindd
3173                  * update the cached creds storage - gd
3174                  */
3175                 if (cached_login) {
3176                         ctx->ctrl |= WINBIND_CACHED_LOGIN;
3177                 }
3178
3179                 ret = winbind_chauthtok_request(ctx, user, pass_old,
3180                                                 pass_new, pwdlastset_update);
3181                 if (ret) {
3182                         pass_old = pass_new = NULL;
3183                         goto out;
3184                 }
3185
3186                 if (_pam_require_krb5_auth_after_chauthtok(ctx, user)) {
3187
3188                         const char *member = NULL;
3189                         const char *cctype = NULL;
3190                         int warn_pwd_expire;
3191                         struct wbcLogonUserInfo *info = NULL;
3192                         struct wbcUserPasswordPolicyInfo *policy = NULL;
3193
3194                         member = get_member_from_config(ctx);
3195                         cctype = get_krb5_cc_type_from_config(ctx);
3196                         warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
3197
3198                         /* Keep WINBIND_CACHED_LOGIN bit for
3199                          * authentication after changing the password.
3200                          * This will update the cached credentials in case
3201                          * that winbindd_dual_pam_chauthtok() fails
3202                          * to update them.
3203                          * --- BoYang
3204                          * */
3205
3206                         ret = winbind_auth_request(ctx, user, pass_new,
3207                                                    member, cctype, 0,
3208                                                    &error, &info, &policy,
3209                                                    NULL, &username_ret);
3210                         pass_old = pass_new = NULL;
3211
3212                         if (ret == PAM_SUCCESS) {
3213
3214                                 struct wbcAuthUserInfo *user_info = NULL;
3215
3216                                 if (info && info->info) {
3217                                         user_info = info->info;
3218                                 }
3219
3220                                 /* warn a user if the password is about to
3221                                  * expire soon */
3222                                 _pam_warn_password_expiry(ctx, user_info, policy,
3223                                                           warn_pwd_expire,
3224                                                           NULL, NULL);
3225
3226                                 /* set some info3 info for other modules in the
3227                                  * stack */
3228                                 _pam_set_data_info3(ctx, user_info);
3229
3230                                 /* put krb5ccname into env */
3231                                 _pam_setup_krb5_env(ctx, info);
3232
3233                                 if (username_ret) {
3234                                         pam_set_item(pamh, PAM_USER,
3235                                                      username_ret);
3236                                         _pam_log_debug(ctx, LOG_INFO,
3237                                                        "Returned user was '%s'",
3238                                                        username_ret);
3239                                         free(username_ret);
3240                                 }
3241
3242                         }
3243
3244                         if (info && info->blobs) {
3245                                 wbcFreeMemory(info->blobs);
3246                         }
3247                         wbcFreeMemory(info);
3248                         wbcFreeMemory(policy);
3249
3250                         goto out;
3251                 }
3252         } else {
3253                 ret = PAM_SERVICE_ERR;
3254         }
3255
3256 out:
3257         {
3258                 /* Deal with offline errors. */
3259                 int i;
3260                 const char *codes[] = {
3261                         "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
3262                         "NT_STATUS_NO_LOGON_SERVERS",
3263                         "NT_STATUS_ACCESS_DENIED"
3264                 };
3265
3266                 for (i=0; i<ARRAY_SIZE(codes); i++) {
3267                         int _ret;
3268                         if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
3269                                 break;
3270                         }
3271                 }
3272         }
3273
3274         wbcFreeMemory(error);
3275
3276         _PAM_LOG_FUNCTION_LEAVE("pam_sm_chauthtok", ctx, ret);
3277
3278         TALLOC_FREE(ctx);
3279
3280         return ret;
3281 }
3282
3283 #ifdef PAM_STATIC
3284
3285 /* static module data */
3286
3287 struct pam_module _pam_winbind_modstruct = {
3288         MODULE_NAME,
3289         pam_sm_authenticate,
3290         pam_sm_setcred,
3291         pam_sm_acct_mgmt,
3292         pam_sm_open_session,
3293         pam_sm_close_session,
3294         pam_sm_chauthtok
3295 };
3296
3297 #endif
3298
3299 /*
3300  * Copyright (c) Andrew Tridgell  <tridge@samba.org>   2000
3301  * Copyright (c) Tim Potter       <tpot@samba.org>     2000
3302  * Copyright (c) Andrew Bartlettt <abartlet@samba.org> 2002
3303  * Copyright (c) Guenther Deschner <gd@samba.org>      2005-2008
3304  * Copyright (c) Jan Rêkorajski 1999.
3305  * Copyright (c) Andrew G. Morgan 1996-8.
3306  * Copyright (c) Alex O. Yuriev, 1996.
3307  * Copyright (c) Cristian Gafton 1996.
3308  * Copyright (C) Elliot Lee <sopwith@redhat.com> 1996, Red Hat Software.
3309  *
3310  * Redistribution and use in source and binary forms, with or without
3311  * modification, are permitted provided that the following conditions
3312  * are met:
3313  * 1. Redistributions of source code must retain the above copyright
3314  *    notice, and the entire permission notice in its entirety,
3315  *    including the disclaimer of warranties.
3316  * 2. Redistributions in binary form must reproduce the above copyright
3317  *    notice, this list of conditions and the following disclaimer in the
3318  *    documentation and/or other materials provided with the distribution.
3319  * 3. The name of the author may not be used to endorse or promote
3320  *    products derived from this software without specific prior
3321  *    written permission.
3322  *
3323  * ALTERNATIVELY, this product may be distributed under the terms of
3324  * the GNU Public License, in which case the provisions of the GPL are
3325  * required INSTEAD OF the above restrictions.  (This clause is
3326  * necessary due to a potential bad interaction between the GPL and
3327  * the restrictions contained in a BSD-style copyright.)
3328  *
3329  * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
3330  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
3331  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
3332  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
3333  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
3334  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
3335  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
3336  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
3337  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
3338  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
3339  * OF THE POSSIBILITY OF SUCH DAMAGE.
3340  */