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