source/utils/ntlm_auth.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Winbind status program.
   5
   6    Copyright (C) Tim Potter      2000-2003
   7    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2003-2004
   8    Copyright (C) Francesco Chemolli <kinkie@kame.usr.dsi.unimi.it> 2000
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23 */
  24
  25 #include "includes.h"
  26 #include "system/filesys.h"
  27 #include "system/passwd.h"
  28 #include "lib/cmdline/popt_common.h"
  29 #include "auth/auth.h"
  30 #include "librpc/gen_ndr/ndr_security.h"
  31 #include "pstring.h"
  32
  33 #define SQUID_BUFFER_SIZE 2010
  34
  35 enum stdio_helper_mode {
  36         SQUID_2_4_BASIC,
  37         SQUID_2_5_BASIC,
  38         SQUID_2_5_NTLMSSP,
  39         NTLMSSP_CLIENT_1,
  40         GSS_SPNEGO_CLIENT,
  41         GSS_SPNEGO_SERVER,
  42         NTLM_SERVER_1,
  43         NUM_HELPER_MODES
  44 };
  45
  46 #define NTLM_AUTH_FLAG_USER_SESSION_KEY     0x0004
  47 #define NTLM_AUTH_FLAG_LMKEY                0x0008
  48
  49
  50 typedef void (*stdio_helper_function)(enum stdio_helper_mode stdio_helper_mode,
  51                                       char *buf, int length, void **private,
  52                                       unsigned int mux_id, void **private2);
  53
  54 static void manage_squid_basic_request (enum stdio_helper_mode stdio_helper_mode,
  55                                         char *buf, int length, void **private,
  56                                         unsigned int mux_id, void **private2);
  57
  58 static void manage_gensec_request (enum stdio_helper_mode stdio_helper_mode,
  59                                    char *buf, int length, void **private,
  60                                    unsigned int mux_id, void **private2);
  61
  62 static void manage_ntlm_server_1_request (enum stdio_helper_mode stdio_helper_mode,
  63                                           char *buf, int length, void **private,
  64                                           unsigned int mux_id, void **private2);
  65
  66 static void manage_squid_request(enum stdio_helper_mode helper_mode,
  67                                  stdio_helper_function fn, void **private2);
  68
  69 static const struct {
  70         enum stdio_helper_mode mode;
  71         const char *name;
  72         stdio_helper_function fn;
  73 } stdio_helper_protocols[] = {
  74         { SQUID_2_4_BASIC, "squid-2.4-basic", manage_squid_basic_request},
  75         { SQUID_2_5_BASIC, "squid-2.5-basic", manage_squid_basic_request},
  76         { SQUID_2_5_NTLMSSP, "squid-2.5-ntlmssp", manage_gensec_request},
  77         { GSS_SPNEGO_CLIENT, "gss-spnego-client", manage_gensec_request},
  78         { GSS_SPNEGO_SERVER, "gss-spnego", manage_gensec_request},
  79         { NTLMSSP_CLIENT_1, "ntlmssp-client-1", manage_gensec_request},
  80         { NTLM_SERVER_1, "ntlm-server-1", manage_ntlm_server_1_request},
  81         { NUM_HELPER_MODES, NULL, NULL}
  82 };
  83
  84 extern int winbindd_fd;
  85
  86 static const char *opt_username;
  87 static const char *opt_domain;
  88 static const char *opt_workstation;
  89 static const char *opt_password;
  90 static int opt_multiplex;
  91
  92
  93 static void mux_printf(unsigned int mux_id, const char *format, ...) PRINTF_ATTRIBUTE(2, 3);
  94
  95 static void mux_printf(unsigned int mux_id, const char *format, ...)
  96 {
  97         va_list ap;
  98
  99         if (opt_multiplex) {
 100                 x_fprintf(x_stdout, "%d ", mux_id);
 101         }
 102
 103         va_start(ap, format);
 104         x_vfprintf(x_stdout, format, ap);
 105         va_end(ap);
 106 }
 107
 108
 109
 110 /* Copy of parse_domain_user from winbindd_util.c.  Parse a string of the
 111    form DOMAIN/user into a domain and a user */
 112
 113 static BOOL parse_ntlm_auth_domain_user(const char *domuser, fstring domain,
 114                                         fstring user)
 115 {
 116
 117         char *p = strchr(domuser,*lp_winbind_separator());
 118
 119         if (!p) {
 120                 return False;
 121         }
 122
 123         fstrcpy(user, p+1);
 124         fstrcpy(domain, domuser);
 125         domain[PTR_DIFF(p, domuser)] = 0;
 126
 127         return True;
 128 }
 129
 130 /* Authenticate a user with a plaintext password */
 131
 132 static BOOL check_plaintext_auth(const char *user, const char *pass,
 133                                  BOOL stdout_diagnostics)
 134 {
 135         return (strcmp(pass, opt_password) == 0);
 136 }
 137
 138 /* authenticate a user with an encrypted username/password */
 139
 140 static NTSTATUS local_pw_check_specified(const char *username,
 141                                          const char *domain,
 142                                          const char *workstation,
 143                                          const DATA_BLOB *challenge,
 144                                          const DATA_BLOB *lm_response,
 145                                          const DATA_BLOB *nt_response,
 146                                          uint32_t flags,
 147                                          DATA_BLOB *lm_session_key,
 148                                          DATA_BLOB *user_session_key,
 149                                          char **error_string,
 150                                          char **unix_name)
 151 {
 152         NTSTATUS nt_status;
 153         struct samr_Password lm_pw, nt_pw;
 154         struct samr_Password *lm_pwd, *nt_pwd;
 155         TALLOC_CTX *mem_ctx = talloc_init("local_pw_check_specified");
 156         if (!mem_ctx) {
 157                 nt_status = NT_STATUS_NO_MEMORY;
 158         } else {
 159
 160                 E_md4hash(opt_password, nt_pw.hash);
 161                 if (E_deshash(opt_password, lm_pw.hash)) {
 162                         lm_pwd = &lm_pw;
 163                 } else {
 164                         lm_pwd = NULL;
 165                 }
 166                 nt_pwd = &nt_pw;
 167
 168
 169                 nt_status = ntlm_password_check(mem_ctx,
 170                                                 challenge,
 171                                                 lm_response,
 172                                                 nt_response,
 173                                                 username,
 174                                                 username,
 175                                                 domain,
 176                                                 lm_pwd, nt_pwd, user_session_key, lm_session_key);
 177
 178                 if (NT_STATUS_IS_OK(nt_status)) {
 179                         if (unix_name) {
 180                                 asprintf(unix_name,
 181                                          "%s%c%s", domain,
 182                                          *lp_winbind_separator(),
 183                                          username);
 184                         }
 185                 } else {
 186                         DEBUG(3, ("Login for user [%s]\\[%s]@[%s] failed due to [%s]\n",
 187                                   domain, username, workstation,
 188                                   nt_errstr(nt_status)));
 189                 }
 190                 talloc_free(mem_ctx);
 191         }
 192         if (error_string) {
 193                 *error_string = strdup(nt_errstr(nt_status));
 194         }
 195         return nt_status;
 196
 197
 198 }
 199
 200 static void manage_squid_basic_request(enum stdio_helper_mode stdio_helper_mode,
 201                                        char *buf, int length, void **private,
 202                                        unsigned int mux_id, void **private2)
 203 {
 204         char *user, *pass;
 205         user=buf;
 206
 207         pass=memchr(buf,' ',length);
 208         if (!pass) {
 209                 DEBUG(2, ("Password not found. Denying access\n"));
 210                 mux_printf(mux_id, "ERR\n");
 211                 return;
 212         }
 213         *pass='\0';
 214         pass++;
 215
 216         if (stdio_helper_mode == SQUID_2_5_BASIC) {
 217                 rfc1738_unescape(user);
 218                 rfc1738_unescape(pass);
 219         }
 220
 221         if (check_plaintext_auth(user, pass, False)) {
 222                 mux_printf(mux_id, "OK\n");
 223         } else {
 224                 mux_printf(mux_id, "ERR\n");
 225         }
 226 }
 227
 228 /* This is a bit hairy, but the basic idea is to do a password callback
 229    to the calling application.  The callback comes from within gensec */
 230
 231 static void manage_gensec_get_pw_request(enum stdio_helper_mode stdio_helper_mode,
 232                                          char *buf, int length, void **private,
 233                                          unsigned int mux_id, void **password)
 234 {
 235         DATA_BLOB in;
 236         if (strlen(buf) < 2) {
 237                 DEBUG(1, ("query [%s] invalid", buf));
 238                 mux_printf(mux_id, "BH\n");
 239                 return;
 240         }
 241
 242         if (strlen(buf) > 3) {
 243                 in = base64_decode_data_blob(NULL, buf + 3);
 244         } else {
 245                 in = data_blob(NULL, 0);
 246         }
 247
 248         if (strncmp(buf, "PW ", 3) == 0) {
 249
 250                 *password = talloc_strndup(*private /* hopefully the right gensec context, useful to use for talloc */,
 251                                            (const char *)in.data, in.length);
 252
 253                 if (*password == NULL) {
 254                         DEBUG(1, ("Out of memory\n"));
 255                         mux_printf(mux_id, "BH\n");
 256                         data_blob_free(&in);
 257                         return;
 258                 }
 259
 260                 mux_printf(mux_id, "OK\n");
 261                 data_blob_free(&in);
 262                 return;
 263         }
 264         DEBUG(1, ("Asked for (and expected) a password\n"));
 265         mux_printf(mux_id, "BH\n");
 266         data_blob_free(&in);
 267 }
 268
 269 /**
 270  * Callback for password credentails.  This is not async, and when
 271  * GENSEC and the credentails code is made async, it will look rather
 272  * different.
 273  */
 274
 275 static const char *get_password(struct cli_credentials *credentials)
 276 {
 277         char *password = NULL;
 278
 279         /* Ask for a password */
 280         mux_printf((unsigned int)credentials->priv_data, "PW\n");
 281         credentials->priv_data = NULL;
 282
 283         manage_squid_request(NUM_HELPER_MODES /* bogus */, manage_gensec_get_pw_request, (void **)&password);
 284         return password;
 285 }
 286
 287 static void manage_gensec_request(enum stdio_helper_mode stdio_helper_mode,
 288                                   char *buf, int length, void **private,
 289                                   unsigned int mux_id, void **private2)
 290 {
 291         DATA_BLOB in;
 292         DATA_BLOB out = data_blob(NULL, 0);
 293         char *out_base64 = NULL;
 294         const char *reply_arg = NULL;
 295         struct gensec_ntlm_state {
 296                 struct gensec_security *gensec_state;
 297                 const char *set_password;
 298         };
 299         struct gensec_ntlm_state *state;
 300
 301         NTSTATUS nt_status;
 302         BOOL first = False;
 303         const char *reply_code;
 304         struct cli_credentials *creds;
 305
 306         TALLOC_CTX *mem_ctx;
 307
 308         if (*private) {
 309                 state = *private;
 310         } else {
 311                 state = talloc_zero(NULL, struct gensec_ntlm_state);
 312                 if (!state) {
 313                         mux_printf(mux_id, "BH No Memory\n");
 314                         exit(1);
 315                 }
 316                 *private = state;
 317                 if (opt_password) {
 318                         state->set_password = opt_password;
 319                 }
 320         }
 321
 322         if (strlen(buf) < 2) {
 323                 DEBUG(1, ("query [%s] invalid", buf));
 324                 mux_printf(mux_id, "BH\n");
 325                 return;
 326         }
 327
 328         if (strlen(buf) > 3) {
 329                 in = base64_decode_data_blob(NULL, buf + 3);
 330         } else {
 331                 in = data_blob(NULL, 0);
 332         }
 333
 334         if (strncmp(buf, "YR", 2) == 0) {
 335                 if (state->gensec_state) {
 336                         talloc_free(state->gensec_state);
 337                         state->gensec_state = NULL;
 338                 }
 339         } else if ( (strncmp(buf, "OK", 2) == 0)) {
 340                 /* do nothing */
 341                 data_blob_free(&in);
 342                 return;
 343         } else if ( (strncmp(buf, "TT ", 3) != 0) &&
 344                     (strncmp(buf, "KK ", 3) != 0) &&
 345                     (strncmp(buf, "AF ", 3) != 0) &&
 346                     (strncmp(buf, "NA ", 3) != 0) &&
 347                     (strncmp(buf, "UG", 2) != 0) &&
 348                     (strncmp(buf, "PW ", 3) != 0)) {
 349                 DEBUG(1, ("SPNEGO request [%s] invalid\n", buf));
 350                 mux_printf(mux_id, "BH\n");
 351                 data_blob_free(&in);
 352                 return;
 353         }
 354
 355         /* setup gensec */
 356         if (!(state->gensec_state)) {
 357                 switch (stdio_helper_mode) {
 358                 case GSS_SPNEGO_CLIENT:
 359                 case NTLMSSP_CLIENT_1:
 360                         /* setup the client side */
 361
 362                         nt_status = gensec_client_start(NULL, &state->gensec_state, NULL);
 363                         if (!NT_STATUS_IS_OK(nt_status)) {
 364                                 exit(1);
 365                         }
 366
 367                         break;
 368                 case GSS_SPNEGO_SERVER:
 369                 case SQUID_2_5_NTLMSSP:
 370                         if (!NT_STATUS_IS_OK(gensec_server_start(NULL, &state->gensec_state, NULL))) {
 371                                 exit(1);
 372                         }
 373                         break;
 374                 default:
 375                         abort();
 376                 }
 377
 378                 creds = cli_credentials_init(state->gensec_state);
 379                 cli_credentials_set_conf(creds);
 380                 if (opt_username) {
 381                         cli_credentials_set_username(creds, opt_username, CRED_SPECIFIED);
 382                 }
 383                 if (opt_domain) {
 384                         cli_credentials_set_domain(creds, opt_domain, CRED_SPECIFIED);
 385                 }
 386                 if (state->set_password) {
 387                         cli_credentials_set_password(creds, state->set_password, CRED_SPECIFIED);
 388                 } else {
 389                         cli_credentials_set_password_callback(creds, get_password);
 390                         creds->priv_data = (void*)mux_id;
 391                 }
 392                 if (opt_workstation) {
 393                         cli_credentials_set_workstation(creds, opt_workstation, CRED_SPECIFIED);
 394                 }
 395
 396                 switch (stdio_helper_mode) {
 397                 case GSS_SPNEGO_SERVER:
 398                 case SQUID_2_5_NTLMSSP:
 399                         cli_credentials_set_machine_account(creds);
 400                         break;
 401                 default:
 402                         break;
 403                 }
 404
 405                 gensec_set_credentials(state->gensec_state, creds);
 406
 407                 switch (stdio_helper_mode) {
 408                 case GSS_SPNEGO_CLIENT:
 409                 case GSS_SPNEGO_SERVER:
 410                         nt_status = gensec_start_mech_by_oid(state->gensec_state, GENSEC_OID_SPNEGO);
 411                         if (!in.length) {
 412                                 first = True;
 413                         }
 414                         break;
 415                 case NTLMSSP_CLIENT_1:
 416                         if (!in.length) {
 417                                 first = True;
 418                         }
 419                 case SQUID_2_5_NTLMSSP:
 420                         nt_status = gensec_start_mech_by_oid(state->gensec_state, GENSEC_OID_NTLMSSP);
 421                         break;
 422                 default:
 423                         abort();
 424                 }
 425
 426                 if (!NT_STATUS_IS_OK(nt_status)) {
 427                         DEBUG(1, ("GENSEC mech failed to start: %s\n", nt_errstr(nt_status)));
 428                         mux_printf(mux_id, "BH\n");
 429                         return;
 430                 }
 431
 432         }
 433
 434         /* update */
 435         mem_ctx = talloc_named(NULL, 0, "manage_gensec_request internal mem_ctx");
 436
 437         if (strncmp(buf, "PW ", 3) == 0) {
 438                 state->set_password = talloc_strndup(state,
 439                                                      (const char *)in.data,
 440                                                      in.length);
 441
 442                 cli_credentials_set_password(gensec_get_credentials(state->gensec_state),
 443                                              state->set_password,
 444                                              CRED_SPECIFIED);
 445                 mux_printf(mux_id, "OK\n");
 446                 data_blob_free(&in);
 447                 talloc_free(mem_ctx);
 448                 return;
 449         }
 450
 451         if (strncmp(buf, "UG", 2) == 0) {
 452                 int i;
 453                 char *grouplist = NULL;
 454                 struct auth_session_info *session_info;
 455
 456                 if (!NT_STATUS_IS_OK(gensec_session_info(state->gensec_state, &session_info))) {
 457                         DEBUG(1, ("gensec_session_info failed: %s\n", nt_errstr(nt_status)));
 458                         mux_printf(mux_id, "BH %s\n", nt_errstr(nt_status));
 459                         data_blob_free(&in);
 460                         talloc_free(mem_ctx);
 461                         return;
 462                 }
 463
 464                 /* get the string onto the context */
 465                 grouplist = talloc_strdup(mem_ctx, "");
 466
 467                 for (i=0; i<session_info->security_token->num_sids; i++) {
 468                         struct security_token *token = session_info->security_token;
 469                         const char *sidstr = dom_sid_string(session_info,
 470                                                             token->sids[i]);
 471                         grouplist = talloc_asprintf_append(grouplist, "%s,", sidstr);
 472                 }
 473
 474                 mux_printf(mux_id, "GL %s\n", grouplist);
 475                 talloc_free(session_info);
 476                 data_blob_free(&in);
 477                 talloc_free(mem_ctx);
 478                 return;
 479         }
 480
 481         nt_status = gensec_update(state->gensec_state, mem_ctx, in, &out);
 482
 483         /* don't leak 'bad password'/'no such user' info to the network client */
 484         nt_status = auth_nt_status_squash(nt_status);
 485
 486         if (out.length) {
 487                 out_base64 = base64_encode_data_blob(mem_ctx, out);
 488         } else {
 489                 out_base64 = NULL;
 490         }
 491
 492         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 493                 reply_arg = "*";
 494                 if (first) {
 495                         reply_code = "YR";
 496                 } else if (state->gensec_state->gensec_role == GENSEC_CLIENT) {
 497                         reply_code = "KK";
 498                 } else if (state->gensec_state->gensec_role == GENSEC_SERVER) {
 499                         reply_code = "TT";
 500                 } else {
 501                         abort();
 502                 }
 503
 504
 505         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCESS_DENIED)) {
 506                 reply_code = "BH";
 507                 reply_arg = nt_errstr(nt_status);
 508                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 509         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_UNSUCCESSFUL)) {
 510                 reply_code = "BH";
 511                 reply_arg = nt_errstr(nt_status);
 512                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 513         } else if (!NT_STATUS_IS_OK(nt_status)) {
 514                 reply_code = "NA";
 515                 reply_arg = nt_errstr(nt_status);
 516                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 517         } else if /* OK */ (state->gensec_state->gensec_role == GENSEC_SERVER) {
 518                 struct auth_session_info *session_info;
 519
 520                 nt_status = gensec_session_info(state->gensec_state, &session_info);
 521                 if (!NT_STATUS_IS_OK(nt_status)) {
 522                         reply_code = "BH";
 523                         reply_arg = nt_errstr(nt_status);
 524                         DEBUG(1, ("GENSEC failed to retreive the session info: %s\n", nt_errstr(nt_status)));
 525                 } else {
 526
 527                         reply_code = "AF";
 528                         reply_arg = talloc_asprintf(state->gensec_state,
 529                                                     "%s%s%s", session_info->server_info->domain_name,
 530                                                     lp_winbind_separator(), session_info->server_info->account_name);
 531                         talloc_free(session_info);
 532                 }
 533         } else if (state->gensec_state->gensec_role == GENSEC_CLIENT) {
 534                 reply_code = "AF";
 535                 reply_arg = out_base64;
 536         } else {
 537                 abort();
 538         }
 539
 540         switch (stdio_helper_mode) {
 541         case GSS_SPNEGO_SERVER:
 542                 mux_printf(mux_id, "%s %s %s\n", reply_code,
 543                           out_base64 ? out_base64 : "*",
 544                           reply_arg ? reply_arg : "*");
 545                 break;
 546         default:
 547                 if (out_base64) {
 548                         mux_printf(mux_id, "%s %s\n", reply_code, out_base64);
 549                 } else if (reply_arg) {
 550                         mux_printf(mux_id, "%s %s\n", reply_code, reply_arg);
 551                 } else {
 552                         mux_printf(mux_id, "%s\n", reply_code);
 553                 }
 554         }
 555
 556         talloc_free(mem_ctx);
 557         return;
 558 }
 559
 560 static void manage_ntlm_server_1_request(enum stdio_helper_mode stdio_helper_mode,
 561                                          char *buf, int length, void **private,
 562                                          unsigned int mux_id, void **private2)
 563 {
 564         char *request, *parameter;
 565         static DATA_BLOB challenge;
 566         static DATA_BLOB lm_response;
 567         static DATA_BLOB nt_response;
 568         static char *full_username;
 569         static char *username;
 570         static char *domain;
 571         static char *plaintext_password;
 572         static BOOL ntlm_server_1_user_session_key;
 573         static BOOL ntlm_server_1_lm_session_key;
 574
 575         if (strequal(buf, ".")) {
 576                 if (!full_username && !username) {
 577                         mux_printf(mux_id, "Error: No username supplied!\n");
 578                 } else if (plaintext_password) {
 579                         /* handle this request as plaintext */
 580                         if (!full_username) {
 581                                 if (asprintf(&full_username, "%s%c%s", domain, *lp_winbind_separator(), username) == -1) {
 582                                         mux_printf(mux_id, "Error: Out of memory in asprintf!\n.\n");
 583                                         return;
 584                                 }
 585                         }
 586                         if (check_plaintext_auth(full_username, plaintext_password, False)) {
 587                                 mux_printf(mux_id, "Authenticated: Yes\n");
 588                         } else {
 589                                 mux_printf(mux_id, "Authenticated: No\n");
 590                         }
 591                 } else if (!lm_response.data && !nt_response.data) {
 592                         mux_printf(mux_id, "Error: No password supplied!\n");
 593                 } else if (!challenge.data) {
 594                         mux_printf(mux_id, "Error: No lanman-challenge supplied!\n");
 595                 } else {
 596                         char *error_string = NULL;
 597                         DATA_BLOB lm_key;
 598                         DATA_BLOB user_session_key;
 599                         uint32_t flags = 0;
 600
 601                         if (full_username && !username) {
 602                                 fstring fstr_user;
 603                                 fstring fstr_domain;
 604
 605                                 if (!parse_ntlm_auth_domain_user(full_username, fstr_user, fstr_domain)) {
 606                                         /* username might be 'tainted', don't print into our new-line deleimianted stream */
 607                                         mux_printf(mux_id, "Error: Could not parse into domain and username\n");
 608                                 }
 609                                 SAFE_FREE(username);
 610                                 SAFE_FREE(domain);
 611                                 username = smb_xstrdup(fstr_user);
 612                                 domain = smb_xstrdup(fstr_domain);
 613                         }
 614
 615                         if (!domain) {
 616                                 domain = smb_xstrdup(lp_workgroup());
 617                         }
 618
 619                         if (ntlm_server_1_lm_session_key)
 620                                 flags |= NTLM_AUTH_FLAG_LMKEY;
 621
 622                         if (ntlm_server_1_user_session_key)
 623                                 flags |= NTLM_AUTH_FLAG_USER_SESSION_KEY;
 624
 625                         if (!NT_STATUS_IS_OK(
 626                                     local_pw_check_specified(username,
 627                                                               domain,
 628                                                               lp_netbios_name(),
 629                                                               &challenge,
 630                                                               &lm_response,
 631                                                               &nt_response,
 632                                                               flags,
 633                                                               &lm_key,
 634                                                               &user_session_key,
 635                                                               &error_string,
 636                                                               NULL))) {
 637
 638                                 mux_printf(mux_id, "Authenticated: No\n");
 639                                 mux_printf(mux_id, "Authentication-Error: %s\n.\n", error_string);
 640                                 SAFE_FREE(error_string);
 641                         } else {
 642                                 static char zeros[16];
 643                                 char *hex_lm_key;
 644                                 char *hex_user_session_key;
 645
 646                                 mux_printf(mux_id, "Authenticated: Yes\n");
 647
 648                                 if (ntlm_server_1_lm_session_key
 649                                     && lm_key.length
 650                                     && (memcmp(zeros, lm_key.data,
 651                                                                 lm_key.length) != 0)) {
 652                                         hex_encode(lm_key.data,
 653                                                    lm_key.length,
 654                                                    &hex_lm_key);
 655                                         mux_printf(mux_id, "LANMAN-Session-Key: %s\n", hex_lm_key);
 656                                         SAFE_FREE(hex_lm_key);
 657                                 }
 658
 659                                 if (ntlm_server_1_user_session_key
 660                                     && user_session_key.length
 661                                     && (memcmp(zeros, user_session_key.data,
 662                                                user_session_key.length) != 0)) {
 663                                         hex_encode(user_session_key.data,
 664                                                    user_session_key.length,
 665                                                    &hex_user_session_key);
 666                                         mux_printf(mux_id, "User-Session-Key: %s\n", hex_user_session_key);
 667                                         SAFE_FREE(hex_user_session_key);
 668                                 }
 669                         }
 670                 }
 671                 /* clear out the state */
 672                 challenge = data_blob(NULL, 0);
 673                 nt_response = data_blob(NULL, 0);
 674                 lm_response = data_blob(NULL, 0);
 675                 SAFE_FREE(full_username);
 676                 SAFE_FREE(username);
 677                 SAFE_FREE(domain);
 678                 SAFE_FREE(plaintext_password);
 679                 ntlm_server_1_user_session_key = False;
 680                 ntlm_server_1_lm_session_key = False;
 681                 mux_printf(mux_id, ".\n");
 682
 683                 return;
 684         }
 685
 686         request = buf;
 687
 688         /* Indicates a base64 encoded structure */
 689         parameter = strstr(request, ":: ");
 690         if (!parameter) {
 691                 parameter = strstr(request, ": ");
 692
 693                 if (!parameter) {
 694                         DEBUG(0, ("Parameter not found!\n"));
 695                         mux_printf(mux_id, "Error: Parameter not found!\n.\n");
 696                         return;
 697                 }
 698
 699                 parameter[0] ='\0';
 700                 parameter++;
 701                 parameter[0] ='\0';
 702                 parameter++;
 703
 704         } else {
 705                 parameter[0] ='\0';
 706                 parameter++;
 707                 parameter[0] ='\0';
 708                 parameter++;
 709                 parameter[0] ='\0';
 710                 parameter++;
 711
 712                 base64_decode_inplace(parameter);
 713         }
 714
 715         if (strequal(request, "LANMAN-Challenge")) {
 716                 challenge = strhex_to_data_blob(parameter);
 717                 if (challenge.length != 8) {
 718                         mux_printf(mux_id, "Error: hex decode of %s failed! (got %d bytes, expected 8)\n.\n",
 719                                   parameter,
 720                                   (int)challenge.length);
 721                         challenge = data_blob(NULL, 0);
 722                 }
 723         } else if (strequal(request, "NT-Response")) {
 724                 nt_response = strhex_to_data_blob(parameter);
 725                 if (nt_response.length < 24) {
 726                         mux_printf(mux_id, "Error: hex decode of %s failed! (only got %d bytes, needed at least 24)\n.\n",
 727                                   parameter,
 728                                   (int)nt_response.length);
 729                         nt_response = data_blob(NULL, 0);
 730                 }
 731         } else if (strequal(request, "LANMAN-Response")) {
 732                 lm_response = strhex_to_data_blob(parameter);
 733                 if (lm_response.length != 24) {
 734                         mux_printf(mux_id, "Error: hex decode of %s failed! (got %d bytes, expected 24)\n.\n",
 735                                   parameter,
 736                                   (int)lm_response.length);
 737                         lm_response = data_blob(NULL, 0);
 738                 }
 739         } else if (strequal(request, "Password")) {
 740                 plaintext_password = smb_xstrdup(parameter);
 741         } else if (strequal(request, "NT-Domain")) {
 742                 domain = smb_xstrdup(parameter);
 743         } else if (strequal(request, "Username")) {
 744                 username = smb_xstrdup(parameter);
 745         } else if (strequal(request, "Full-Username")) {
 746                 full_username = smb_xstrdup(parameter);
 747         } else if (strequal(request, "Request-User-Session-Key")) {
 748                 ntlm_server_1_user_session_key = strequal(parameter, "Yes");
 749         } else if (strequal(request, "Request-LanMan-Session-Key")) {
 750                 ntlm_server_1_lm_session_key = strequal(parameter, "Yes");
 751         } else {
 752                 mux_printf(mux_id, "Error: Unknown request %s\n.\n", request);
 753         }
 754 }
 755
 756 static void manage_squid_request(enum stdio_helper_mode helper_mode,
 757                                  stdio_helper_function fn, void **private2)
 758 {
 759         char buf[SQUID_BUFFER_SIZE+1];
 760         unsigned int mux_id;
 761         int length;
 762         char *c;
 763         static BOOL err;
 764         struct mux_private {
 765                 unsigned int max_mux;
 766                 void **private_pointers;
 767         };
 768
 769         static struct mux_private *mux_private;
 770         static void *normal_private;
 771         void **private;
 772
 773         /* this is not a typo - x_fgets doesn't work too well under squid */
 774         if (fgets(buf, sizeof(buf)-1, stdin) == NULL) {
 775                 if (ferror(stdin)) {
 776                         DEBUG(1, ("fgets() failed! dying..... errno=%d (%s)\n", ferror(stdin),
 777                                   strerror(ferror(stdin))));
 778
 779                         exit(1);    /* BIIG buffer */
 780                 }
 781                 exit(0);
 782         }
 783
 784         c=memchr(buf,'\n',sizeof(buf)-1);
 785         if (c) {
 786                 *c = '\0';
 787                 length = c-buf;
 788         } else {
 789                 err = 1;
 790                 return;
 791         }
 792         if (err) {
 793                 DEBUG(0, ("Oversized message\n"));
 794                 x_fprintf(x_stdout, "ERR\n");
 795                 err = 0;
 796                 return;
 797         }
 798
 799         DEBUG(10, ("Got '%s' from squid (length: %d).\n",buf,length));
 800
 801         if (buf[0] == '\0') {
 802                 DEBUG(0, ("Invalid Request (empty)\n"));
 803                 x_fprintf(x_stdout, "ERR\n");
 804                 return;
 805         }
 806
 807         if (opt_multiplex) {
 808                 if (sscanf(buf, "%u ", &mux_id) != 1) {
 809                         DEBUG(0, ("Invalid Request - no multiplex id\n"));
 810                         x_fprintf(x_stdout, "ERR\n");
 811                         return;
 812                 }
 813                 if (!mux_private) {
 814                         mux_private = talloc(NULL, struct mux_private);
 815                         mux_private->max_mux = 0;
 816                         mux_private->private_pointers = NULL;
 817                 }
 818
 819                 c=strchr(buf,' ');
 820                 if (!c) {
 821                         DEBUG(0, ("Invalid Request - no data after multiplex id\n"));
 822                         x_fprintf(x_stdout, "ERR\n");
 823                         return;
 824                 }
 825                 c++;
 826                 if (mux_id >= mux_private->max_mux) {
 827                         unsigned int prev_max = mux_private->max_mux;
 828                         mux_private->max_mux = mux_id + 1;
 829                         mux_private->private_pointers
 830                                 = talloc_realloc(mux_private,
 831                                                    mux_private->private_pointers,
 832                                                    void *, mux_private->max_mux);
 833                         memset(&mux_private->private_pointers[prev_max], '\0',
 834                                (sizeof(*mux_private->private_pointers) * (mux_private->max_mux - prev_max)));
 835                 };
 836
 837                 private = &mux_private->private_pointers[mux_id];
 838         } else {
 839                 c = buf;
 840                 private = &normal_private;
 841         }
 842
 843         fn(helper_mode, c, length, private, mux_id, private2);
 844 }
 845
 846 static void squid_stream(enum stdio_helper_mode stdio_mode,
 847                          stdio_helper_function fn) {
 848         /* initialize FDescs */
 849         x_setbuf(x_stdout, NULL);
 850         x_setbuf(x_stderr, NULL);
 851         while(1) {
 852                 manage_squid_request(stdio_mode, fn, NULL);
 853         }
 854 }
 855
 856
 857 /* Main program */
 858
 859 enum {
 860         OPT_USERNAME = 1000,
 861         OPT_DOMAIN,
 862         OPT_WORKSTATION,
 863         OPT_CHALLENGE,
 864         OPT_RESPONSE,
 865         OPT_LM,
 866         OPT_NT,
 867         OPT_PASSWORD,
 868         OPT_LM_KEY,
 869         OPT_USER_SESSION_KEY,
 870         OPT_DIAGNOSTICS,
 871         OPT_REQUIRE_MEMBERSHIP,
 872         OPT_MULTIPLEX,
 873 };
 874
 875  int main(int argc, const char **argv)
 876 {
 877         static const char *helper_protocol;
 878         int opt;
 879
 880         poptContext pc;
 881
 882         /* NOTE: DO NOT change this interface without considering the implications!
 883            This is an external interface, which other programs will use to interact
 884            with this helper.
 885         */
 886
 887         /* We do not use single-letter command abbreviations, because they harm future
 888            interface stability. */
 889
 890         struct poptOption long_options[] = {
 891                 POPT_AUTOHELP
 892                 { "helper-protocol", 0, POPT_ARG_STRING, &helper_protocol, OPT_DOMAIN, "operate as a stdio-based helper", "helper protocol to use"},
 893                 { "domain", 0, POPT_ARG_STRING, &opt_domain, OPT_DOMAIN, "domain name"},
 894                 { "workstation", 0, POPT_ARG_STRING, &opt_workstation, OPT_WORKSTATION, "workstation"},
 895                 { "username", 0, POPT_ARG_STRING, &opt_username, OPT_PASSWORD, "Username"},
 896                 { "password", 0, POPT_ARG_STRING, &opt_password, OPT_PASSWORD, "User's plaintext password"},
 897                 { "multiplex", 0, POPT_ARG_NONE, &opt_multiplex, OPT_MULTIPLEX, "Multiplex Mode"},
 898                 POPT_COMMON_SAMBA
 899                 POPT_COMMON_VERSION
 900                 POPT_TABLEEND
 901         };
 902
 903         /* Samba client initialisation */
 904
 905         setup_logging(NULL, DEBUG_STDERR);
 906
 907         /* Parse options */
 908
 909         pc = poptGetContext("ntlm_auth", argc, argv, long_options, 0);
 910
 911         /* Parse command line options */
 912
 913         if (argc == 1) {
 914                 poptPrintHelp(pc, stderr, 0);
 915                 return 1;
 916         }
 917
 918         pc = poptGetContext(NULL, argc, (const char **)argv, long_options,
 919                             POPT_CONTEXT_KEEP_FIRST);
 920
 921         while((opt = poptGetNextOpt(pc)) != -1) {
 922                 if (opt < -1) {
 923                         break;
 924                 }
 925         }
 926         if (opt < -1) {
 927                 fprintf(stderr, "%s: %s\n",
 928                         poptBadOption(pc, POPT_BADOPTION_NOALIAS),
 929                         poptStrerror(opt));
 930                 return 1;
 931         }
 932
 933         ntlm_auth_init_subsystems;
 934
 935
 936         if (opt_domain == NULL) {
 937                 opt_domain = lp_workgroup();
 938         }
 939
 940         if (helper_protocol) {
 941                 int i;
 942                 for (i=0; i<NUM_HELPER_MODES; i++) {
 943                         if (strcmp(helper_protocol, stdio_helper_protocols[i].name) == 0) {
 944                                 squid_stream(stdio_helper_protocols[i].mode, stdio_helper_protocols[i].fn);
 945                                 exit(0);
 946                         }
 947                 }
 948                 x_fprintf(x_stderr, "unknown helper protocol [%s]\n\nValid helper protools:\n\n", helper_protocol);
 949
 950                 for (i=0; i<NUM_HELPER_MODES; i++) {
 951                         x_fprintf(x_stderr, "%s\n", stdio_helper_protocols[i].name);
 952                 }
 953
 954                 exit(1);
 955         }
 956
 957         if (!opt_username) {
 958                 x_fprintf(x_stderr, "username must be specified!\n\n");
 959                 poptPrintHelp(pc, stderr, 0);
 960                 exit(1);
 961         }
 962
 963         if (opt_workstation == NULL) {
 964                 opt_workstation = lp_netbios_name();
 965         }
 966
 967         if (!opt_password) {
 968                 opt_password = getpass("password: ");
 969         }
 970
 971         {
 972                 char *user;
 973
 974                 asprintf(&user, "%s%c%s", opt_domain, *lp_winbind_separator(), opt_username);
 975                 if (!check_plaintext_auth(user, opt_password, True)) {
 976                         return 1;
 977                 }
 978         }
 979
 980         /* Exit code */
 981
 982         poptFreeContext(pc);
 983         return 0;
 984 }