source/nsswitch/winbindd_pam.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Winbind daemon - pam auth funcions
   5
   6    Copyright (C) Andrew Tridgell 2000
   7    Copyright (C) Tim Potter 2001
   8    Copyright (C) Andrew Bartlett 2001-2002
   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 "winbindd.h"
  27 #undef DBGC_CLASS
  28 #define DBGC_CLASS DBGC_WINBIND
  29
  30
  31 static NTSTATUS append_info3_as_ndr(TALLOC_CTX *mem_ctx,
  32                                     struct winbindd_cli_state *state,
  33                                     NET_USER_INFO_3 *info3)
  34 {
  35         prs_struct ps;
  36         uint32 size;
  37         if (!prs_init(&ps, 256 /* Random, non-zero number */, mem_ctx, MARSHALL)) {
  38                 return NT_STATUS_NO_MEMORY;
  39         }
  40         if (!net_io_user_info3("", info3, &ps, 1, 3)) {
  41                 prs_mem_free(&ps);
  42                 return NT_STATUS_UNSUCCESSFUL;
  43         }
  44
  45         size = prs_data_size(&ps);
  46         state->response.extra_data = SMB_MALLOC(size);
  47         if (!state->response.extra_data) {
  48                 prs_mem_free(&ps);
  49                 return NT_STATUS_NO_MEMORY;
  50         }
  51         memset( state->response.extra_data, '\0', size );
  52         prs_copy_all_data_out(state->response.extra_data, &ps);
  53         state->response.length += size;
  54         prs_mem_free(&ps);
  55         return NT_STATUS_OK;
  56 }
  57
  58 static NTSTATUS check_info3_in_group(TALLOC_CTX *mem_ctx,
  59                                      NET_USER_INFO_3 *info3,
  60                                      const char *group_sid)
  61 {
  62         DOM_SID require_membership_of_sid;
  63         DOM_SID *all_sids;
  64         size_t num_all_sids = (2 + info3->num_groups2 + info3->num_other_sids);
  65         size_t i, j = 0;
  66
  67         /* Parse the 'required group' SID */
  68
  69         if (!group_sid || !group_sid[0]) {
  70                 /* NO sid supplied, all users may access */
  71                 return NT_STATUS_OK;
  72         }
  73
  74         if (!string_to_sid(&require_membership_of_sid, group_sid)) {
  75                 DEBUG(0, ("check_info3_in_group: could not parse %s as a SID!",
  76                           group_sid));
  77
  78                 return NT_STATUS_INVALID_PARAMETER;
  79         }
  80
  81         all_sids = TALLOC_ARRAY(mem_ctx, DOM_SID, num_all_sids);
  82         if (!all_sids)
  83                 return NT_STATUS_NO_MEMORY;
  84
  85         /* and create (by appending rids) the 'domain' sids */
  86
  87         sid_copy(&all_sids[0], &(info3->dom_sid.sid));
  88
  89         if (!sid_append_rid(&all_sids[0], info3->user_rid)) {
  90                 DEBUG(3,("could not append user's primary RID 0x%x\n",
  91                          info3->user_rid));
  92
  93                 return NT_STATUS_INVALID_PARAMETER;
  94         }
  95         j++;
  96
  97         sid_copy(&all_sids[1], &(info3->dom_sid.sid));
  98
  99         if (!sid_append_rid(&all_sids[1], info3->group_rid)) {
 100                 DEBUG(3,("could not append additional group rid 0x%x\n",
 101                          info3->group_rid));
 102
 103                 return NT_STATUS_INVALID_PARAMETER;
 104         }
 105         j++;
 106
 107         for (i = 0; i < info3->num_groups2; i++) {
 108
 109                 sid_copy(&all_sids[j], &(info3->dom_sid.sid));
 110
 111                 if (!sid_append_rid(&all_sids[j], info3->gids[i].g_rid)) {
 112                         DEBUG(3,("could not append additional group rid 0x%x\n",
 113                                 info3->gids[i].g_rid));
 114
 115                         return NT_STATUS_INVALID_PARAMETER;
 116                 }
 117                 j++;
 118         }
 119
 120         /* Copy 'other' sids.  We need to do sid filtering here to
 121            prevent possible elevation of privileges.  See:
 122
 123            http://www.microsoft.com/windows2000/techinfo/administration/security/sidfilter.asp
 124          */
 125
 126         for (i = 0; i < info3->num_other_sids; i++) {
 127                 sid_copy(&all_sids[info3->num_groups2 + i + 2],
 128                          &info3->other_sids[i].sid);
 129                 j++;
 130         }
 131
 132         for (i = 0; i < j; i++) {
 133                 fstring sid1, sid2;
 134                 DEBUG(10, ("User has SID: %s\n",
 135                            sid_to_string(sid1, &all_sids[i])));
 136                 if (sid_equal(&require_membership_of_sid, &all_sids[i])) {
 137                         DEBUG(10, ("SID %s matches %s - user permitted to authenticate!\n",
 138                                    sid_to_string(sid1, &require_membership_of_sid), sid_to_string(sid2, &all_sids[i])));
 139                         return NT_STATUS_OK;
 140                 }
 141         }
 142
 143         /* Do not distinguish this error from a wrong username/pw */
 144
 145         return NT_STATUS_LOGON_FAILURE;
 146 }
 147
 148 static struct winbindd_domain *find_auth_domain(const char *domain_name)
 149 {
 150         struct winbindd_domain *domain;
 151
 152         if (IS_DC) {
 153                 domain = find_domain_from_name_noinit(domain_name);
 154                 if (domain == NULL) {
 155                         DEBUG(3, ("Authentication for domain [%s] "
 156                                   "as it is not a trusted domain\n",
 157                                   domain_name));
 158                 }
 159                 return domain;
 160         }
 161
 162         if (is_myname(domain_name)) {
 163                 DEBUG(3, ("Authentication for domain %s (local domain "
 164                           "to this server) not supported at this "
 165                           "stage\n", domain_name));
 166                 return NULL;
 167         }
 168
 169         return find_our_domain();
 170 }
 171
 172 static void set_auth_errors(struct winbindd_response *resp, NTSTATUS result)
 173 {
 174         resp->data.auth.nt_status = NT_STATUS_V(result);
 175         fstrcpy(resp->data.auth.nt_status_string, nt_errstr(result));
 176
 177         /* we might have given a more useful error above */
 178         if (*resp->data.auth.error_string == '\0')
 179                 fstrcpy(resp->data.auth.error_string,
 180                         get_friendly_nt_error_msg(result));
 181         resp->data.auth.pam_error = nt_status_to_pam(result);
 182 }
 183
 184 /**********************************************************************
 185  Authenticate a user with a clear text password
 186 **********************************************************************/
 187
 188 void winbindd_pam_auth(struct winbindd_cli_state *state)
 189 {
 190         struct winbindd_domain *domain;
 191         fstring name_domain, name_user;
 192
 193         /* Ensure null termination */
 194         state->request.data.auth.user
 195                 [sizeof(state->request.data.auth.user)-1]='\0';
 196
 197         /* Ensure null termination */
 198         state->request.data.auth.pass
 199                 [sizeof(state->request.data.auth.pass)-1]='\0';
 200
 201         DEBUG(3, ("[%5lu]: pam auth %s\n", (unsigned long)state->pid,
 202                   state->request.data.auth.user));
 203
 204         /* Parse domain and username */
 205
 206         parse_domain_user(state->request.data.auth.user,
 207                           name_domain, name_user);
 208
 209         domain = find_auth_domain(name_domain);
 210
 211         if (domain == NULL) {
 212                 set_auth_errors(&state->response, NT_STATUS_NO_SUCH_USER);
 213                 DEBUG(5, ("Plain text authentication for %s returned %s "
 214                           "(PAM: %d)\n",
 215                           state->request.data.auth.user,
 216                           state->response.data.auth.nt_status_string,
 217                           state->response.data.auth.pam_error));
 218                 request_error(state);
 219                 return;
 220         }
 221
 222         sendto_domain(state, domain);
 223 }
 224
 225 enum winbindd_result winbindd_dual_pam_auth(struct winbindd_domain *domain,
 226                                             struct winbindd_cli_state *state)
 227 {
 228         NTSTATUS result;
 229         fstring name_domain, name_user;
 230         const char *srv_name_slash;
 231         NET_USER_INFO_3 info3;
 232         unsigned char *session_key;
 233         struct rpc_pipe_client *pipe_cli;
 234         uchar chal[8];
 235         DATA_BLOB lm_resp;
 236         DATA_BLOB nt_resp;
 237         DOM_CRED ret_creds;
 238         DOM_CRED *credentials;
 239         int attempts = 0;
 240         unsigned char local_lm_response[24];
 241         unsigned char local_nt_response[24];
 242         struct winbindd_domain *contact_domain;
 243         BOOL retry;
 244
 245         /* Ensure null termination */
 246         state->request.data.auth.user[sizeof(state->request.data.auth.user)-1]='\0';
 247
 248         /* Ensure null termination */
 249         state->request.data.auth.pass[sizeof(state->request.data.auth.pass)-1]='\0';
 250
 251         DEBUG(3, ("[%5lu]: pam auth %s\n", (unsigned long)state->pid,
 252                   state->request.data.auth.user));
 253
 254         /* Parse domain and username */
 255
 256         parse_domain_user(state->request.data.auth.user, name_domain, name_user);
 257
 258         /* do password magic */
 259
 260
 261         generate_random_buffer(chal, 8);
 262         if (lp_client_ntlmv2_auth()) {
 263                 DATA_BLOB server_chal;
 264                 DATA_BLOB names_blob;
 265                 DATA_BLOB nt_response;
 266                 DATA_BLOB lm_response;
 267                 server_chal = data_blob_talloc(state->mem_ctx, chal, 8);
 268
 269                 /* note that the 'workgroup' here is a best guess - we don't know
 270                    the server's domain at this point.  The 'server name' is also
 271                    dodgy...
 272                 */
 273                 names_blob = NTLMv2_generate_names_blob(global_myname(), lp_workgroup());
 274
 275                 if (!SMBNTLMv2encrypt(name_user, name_domain,
 276                                       state->request.data.auth.pass,
 277                                       &server_chal,
 278                                       &names_blob,
 279                                       &lm_response, &nt_response, NULL)) {
 280                         data_blob_free(&names_blob);
 281                         data_blob_free(&server_chal);
 282                         DEBUG(0, ("winbindd_pam_auth: SMBNTLMv2encrypt() failed!\n"));
 283                         result = NT_STATUS_NO_MEMORY;
 284                         goto done;
 285                 }
 286                 data_blob_free(&names_blob);
 287                 data_blob_free(&server_chal);
 288                 lm_resp = data_blob_talloc(state->mem_ctx, lm_response.data,
 289                                            lm_response.length);
 290                 nt_resp = data_blob_talloc(state->mem_ctx, nt_response.data,
 291                                            nt_response.length);
 292                 data_blob_free(&lm_response);
 293                 data_blob_free(&nt_response);
 294
 295         } else {
 296                 if (lp_client_lanman_auth()
 297                     && SMBencrypt(state->request.data.auth.pass,
 298                                   chal,
 299                                   local_lm_response)) {
 300                         lm_resp = data_blob_talloc(state->mem_ctx,
 301                                                    local_lm_response,
 302                                                    sizeof(local_lm_response));
 303                 } else {
 304                         lm_resp = data_blob(NULL, 0);
 305                 }
 306                 SMBNTencrypt(state->request.data.auth.pass,
 307                              chal,
 308                              local_nt_response);
 309
 310                 nt_resp = data_blob_talloc(state->mem_ctx,
 311                                            local_nt_response,
 312                                            sizeof(local_nt_response));
 313         }
 314
 315
 316         /* what domain should we contact? */
 317
 318         if ( IS_DC ) {
 319                 if (!(contact_domain = find_domain_from_name(name_domain))) {
 320                         DEBUG(3, ("Authentication for domain for [%s] -> [%s]\\[%s] failed as %s is not a trusted domain\n",
 321                                   state->request.data.auth.user, name_domain, name_user, name_domain));
 322                         result = NT_STATUS_NO_SUCH_USER;
 323                         goto done;
 324                 }
 325
 326         } else {
 327                 if (is_myname(name_domain)) {
 328                         DEBUG(3, ("Authentication for domain %s (local domain to this server) not supported at this stage\n", name_domain));
 329                         result =  NT_STATUS_NO_SUCH_USER;
 330                         goto done;
 331                 }
 332
 333                 contact_domain = find_our_domain();
 334         }
 335
 336         srv_name_slash = talloc_asprintf(state->mem_ctx, "\\\\%s",
 337                                          contact_domain->dcname);
 338         if (srv_name_slash == NULL) {
 339                 DEBUG(0, ("talloc_asprintf failed\n"));
 340                 return WINBINDD_ERROR;
 341         }
 342
 343         /* check authentication loop */
 344
 345         do {
 346                 DOM_CRED clnt_creds;
 347
 348                 ZERO_STRUCT(info3);
 349                 ZERO_STRUCT(ret_creds);
 350                 retry = False;
 351
 352                 result = cm_connect_netlogon(contact_domain, state->mem_ctx,
 353                                              &pipe_cli, &session_key,
 354                                              &credentials);
 355
 356                 if (!NT_STATUS_IS_OK(result)) {
 357                         DEBUG(3, ("could not open handle to NETLOGON pipe\n"));
 358                         goto done;
 359                 }
 360
 361                 credentials->timestamp.time = time(NULL);
 362                 memcpy(&clnt_creds, credentials, sizeof(clnt_creds));
 363
 364                 /* Calculate the new credentials. */
 365                 cred_create(session_key, &credentials->challenge,
 366                             clnt_creds.timestamp, &(clnt_creds.challenge));
 367
 368                 result = rpccli_netlogon_sam_network_logon(pipe_cli,
 369                                                            state->mem_ctx,
 370                                                            srv_name_slash,
 371                                                            &clnt_creds,
 372                                                            &ret_creds,
 373                                                            name_user,
 374                                                            name_domain,
 375                                                            global_myname(),
 376                                                            chal, lm_resp,
 377                                                            nt_resp, &info3,
 378                                                            session_key);
 379                 attempts += 1;
 380
 381                 /* We have to try a second time as cm_connect_netlogon
 382                    might not yet have noticed that the DC has killed
 383                    our connection. */
 384
 385                 if (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)) {
 386                         retry = True;
 387                         continue;
 388                 }
 389
 390                 /* if we get access denied, a possible cause was that we had
 391                    and open connection to the DC, but someone changed our
 392                    machine account password out from underneath us using 'net
 393                    rpc changetrustpw' */
 394
 395                 if ( NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) ) {
 396                         DEBUG(3,("winbindd_pam_auth: sam_logon returned "
 397                                  "ACCESS_DENIED.  Maybe the trust account "
 398                                 "password was changed and we didn't know it. "
 399                                  "Killing connections to domain %s\n",
 400                                 name_domain));
 401                         invalidate_cm_connection(&contact_domain->conn);
 402                         retry = True;
 403                 }
 404
 405         } while ( (attempts < 2) && retry );
 406
 407         /* Only check creds if we got a connection. */
 408         if (contact_domain->conn.cli &&
 409                         !(NT_STATUS_EQUAL(result, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND) ||
 410                                 NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 411                 if (!clnt_deal_with_creds(session_key, credentials, &ret_creds)) {
 412                         DEBUG(3, ("DC %s sent wrong credentials\n",
 413                                 pipe_cli->cli->srv_name_slash));
 414                         result = NT_STATUS_ACCESS_DENIED;
 415                 }
 416         }
 417
 418         if (NT_STATUS_IS_OK(result)) {
 419                 netsamlogon_cache_store(state->mem_ctx, name_user, &info3);
 420                 wcache_invalidate_samlogon(find_domain_from_name(name_domain), &info3);
 421
 422                 /* Check if the user is in the right group */
 423
 424                 if (!NT_STATUS_IS_OK(result = check_info3_in_group(state->mem_ctx, &info3, state->request.data.auth.require_membership_of_sid))) {
 425                         DEBUG(3, ("User %s is not in the required group (%s), so plaintext authentication is rejected\n",
 426                                   state->request.data.auth.user,
 427                                   state->request.data.auth.require_membership_of_sid));
 428                 }
 429         }
 430
 431 done:
 432         /* give us a more useful (more correct?) error code */
 433         if ((NT_STATUS_EQUAL(result, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND) || (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)))) {
 434                 result = NT_STATUS_NO_LOGON_SERVERS;
 435         }
 436
 437         state->response.data.auth.nt_status = NT_STATUS_V(result);
 438         fstrcpy(state->response.data.auth.nt_status_string, nt_errstr(result));
 439
 440         /* we might have given a more useful error above */
 441         if (!*state->response.data.auth.error_string)
 442                 fstrcpy(state->response.data.auth.error_string, get_friendly_nt_error_msg(result));
 443         state->response.data.auth.pam_error = nt_status_to_pam(result);
 444
 445         DEBUG(NT_STATUS_IS_OK(result) ? 5 : 2, ("Plain-text authentication for user %s returned %s (PAM: %d)\n",
 446               state->request.data.auth.user,
 447               state->response.data.auth.nt_status_string,
 448               state->response.data.auth.pam_error));
 449
 450         if ( NT_STATUS_IS_OK(result) &&
 451              (state->request.flags & WBFLAG_PAM_AFS_TOKEN) ) {
 452
 453                 char *afsname = SMB_STRDUP(lp_afs_username_map());
 454                 char *cell;
 455
 456                 if (afsname == NULL) goto no_token;
 457
 458                 afsname = realloc_string_sub(afsname, "%D", name_domain);
 459                 afsname = realloc_string_sub(afsname, "%u", name_user);
 460                 afsname = realloc_string_sub(afsname, "%U", name_user);
 461
 462                 {
 463                         DOM_SID user_sid;
 464                         fstring sidstr;
 465
 466                         sid_copy(&user_sid, &info3.dom_sid.sid);
 467                         sid_append_rid(&user_sid, info3.user_rid);
 468                         sid_to_string(sidstr, &user_sid);
 469                         afsname = realloc_string_sub(afsname, "%s", sidstr);
 470                 }
 471
 472                 if (afsname == NULL) goto no_token;
 473
 474                 strlower_m(afsname);
 475
 476                 DEBUG(10, ("Generating token for user %s\n", afsname));
 477
 478                 cell = strchr(afsname, '@');
 479
 480                 if (cell == NULL) goto no_token;
 481
 482                 *cell = '\0';
 483                 cell += 1;
 484
 485                 /* Append an AFS token string */
 486                 state->response.extra_data =
 487                         afs_createtoken_str(afsname, cell);
 488
 489                 if (state->response.extra_data != NULL)
 490                         state->response.length +=
 491                                 strlen(state->response.extra_data)+1;
 492
 493         no_token:
 494                 SAFE_FREE(afsname);
 495         }
 496
 497         return NT_STATUS_IS_OK(result) ? WINBINDD_OK : WINBINDD_ERROR;
 498 }
 499
 500 /**********************************************************************
 501  Challenge Response Authentication Protocol
 502 **********************************************************************/
 503
 504 void winbindd_pam_auth_crap(struct winbindd_cli_state *state)
 505 {
 506         struct winbindd_domain *domain = NULL;
 507         const char *domain_name = NULL;
 508         NTSTATUS result;
 509
 510         if (!state->privileged) {
 511                 char *error_string = NULL;
 512                 DEBUG(2, ("winbindd_pam_auth_crap: non-privileged access "
 513                           "denied.  !\n"));
 514                 DEBUGADD(2, ("winbindd_pam_auth_crap: Ensure permissions "
 515                              "on %s are set correctly.\n",
 516                              get_winbind_priv_pipe_dir()));
 517                 /* send a better message than ACCESS_DENIED */
 518                 error_string = talloc_asprintf(state->mem_ctx,
 519                                                "winbind client not authorized "
 520                                                "to use winbindd_pam_auth_crap."
 521                                                " Ensure permissions on %s "
 522                                                "are set correctly.",
 523                                                get_winbind_priv_pipe_dir());
 524                 fstrcpy(state->response.data.auth.error_string, error_string);
 525                 result = NT_STATUS_ACCESS_DENIED;
 526                 goto done;
 527         }
 528
 529         /* Ensure null termination */
 530         state->request.data.auth_crap.user
 531                 [sizeof(state->request.data.auth_crap.user)-1]=0;
 532         state->request.data.auth_crap.domain
 533                 [sizeof(state->request.data.auth_crap.domain)-1]=0;
 534
 535         DEBUG(3, ("[%5lu]: pam auth crap domain: [%s] user: %s\n",
 536                   (unsigned long)state->pid,
 537                   state->request.data.auth_crap.domain,
 538                   state->request.data.auth_crap.user));
 539
 540         if (*state->request.data.auth_crap.domain != '\0') {
 541                 domain_name = state->request.data.auth_crap.domain;
 542         } else if (lp_winbind_use_default_domain()) {
 543                 domain_name = lp_workgroup();
 544         }
 545
 546         if (domain_name != NULL)
 547                 domain = find_auth_domain(domain_name);
 548
 549         if (domain != NULL) {
 550                 sendto_domain(state, domain);
 551                 return;
 552         }
 553
 554         result = NT_STATUS_NO_SUCH_USER;
 555
 556  done:
 557         set_auth_errors(&state->response, result);
 558         DEBUG(5, ("CRAP authentication for %s returned %s (PAM: %d)\n",
 559                   state->request.data.auth.user,
 560                   state->response.data.auth.nt_status_string,
 561                   state->response.data.auth.pam_error));
 562         request_error(state);
 563         return;
 564 }
 565
 566
 567 enum winbindd_result winbindd_dual_pam_auth_crap(struct winbindd_domain *domain,
 568                                                  struct winbindd_cli_state *state)
 569 {
 570         NTSTATUS result;
 571         const char *srv_name_slash;
 572         NET_USER_INFO_3 info3;
 573         unsigned char *session_key;
 574         struct rpc_pipe_client *pipe_cli;
 575         DOM_CRED *credentials;
 576         const char *name_user = NULL;
 577         const char *name_domain = NULL;
 578         const char *workstation;
 579         struct winbindd_domain *contact_domain;
 580         DOM_CRED ret_creds;
 581         int attempts = 0;
 582         BOOL retry;
 583
 584         DATA_BLOB lm_resp, nt_resp;
 585
 586         /* This is child-only, so no check for privileged access is needed
 587            anymore */
 588
 589         /* Ensure null termination */
 590         state->request.data.auth_crap.user[sizeof(state->request.data.auth_crap.user)-1]=0;
 591         state->request.data.auth_crap.domain[sizeof(state->request.data.auth_crap.domain)-1]=0;
 592
 593         name_user = state->request.data.auth_crap.user;
 594
 595         if (*state->request.data.auth_crap.domain) {
 596                 name_domain = state->request.data.auth_crap.domain;
 597         } else if (lp_winbind_use_default_domain()) {
 598                 name_domain = lp_workgroup();
 599         } else {
 600                 DEBUG(5,("no domain specified with username (%s) - failing auth\n",
 601                          name_user));
 602                 result = NT_STATUS_NO_SUCH_USER;
 603                 goto done;
 604         }
 605
 606         DEBUG(3, ("[%5lu]: pam auth crap domain: %s user: %s\n", (unsigned long)state->pid,
 607                   name_domain, name_user));
 608
 609         if (*state->request.data.auth_crap.workstation) {
 610                 workstation = state->request.data.auth_crap.workstation;
 611         } else {
 612                 workstation = global_myname();
 613         }
 614
 615         if (state->request.data.auth_crap.lm_resp_len > sizeof(state->request.data.auth_crap.lm_resp)
 616                 || state->request.data.auth_crap.nt_resp_len > sizeof(state->request.data.auth_crap.nt_resp)) {
 617                 DEBUG(0, ("winbindd_pam_auth_crap: invalid password length %u/%u\n",
 618                           state->request.data.auth_crap.lm_resp_len,
 619                           state->request.data.auth_crap.nt_resp_len));
 620                 result = NT_STATUS_INVALID_PARAMETER;
 621                 goto done;
 622         }
 623
 624         lm_resp = data_blob_talloc(state->mem_ctx, state->request.data.auth_crap.lm_resp, state->request.data.auth_crap.lm_resp_len);
 625         nt_resp = data_blob_talloc(state->mem_ctx, state->request.data.auth_crap.nt_resp, state->request.data.auth_crap.nt_resp_len);
 626
 627
 628         /* what domain should we contact? */
 629
 630         if ( IS_DC ) {
 631                 if (!(contact_domain = find_domain_from_name(name_domain))) {
 632                         DEBUG(3, ("Authentication for domain for [%s] -> [%s]\\[%s] failed as %s is not a trusted domain\n",
 633                                   state->request.data.auth_crap.user, name_domain, name_user, name_domain));
 634                         result = NT_STATUS_NO_SUCH_USER;
 635                         goto done;
 636                 }
 637
 638         } else {
 639                 if (is_myname(name_domain)) {
 640                         DEBUG(3, ("Authentication for domain %s (local domain to this server) not supported at this stage\n", name_domain));
 641                         result =  NT_STATUS_NO_SUCH_USER;
 642                         goto done;
 643                 }
 644
 645                 contact_domain = find_our_domain();
 646         }
 647
 648         srv_name_slash = talloc_asprintf(state->mem_ctx, "\\\\%s",
 649                                          contact_domain->dcname);
 650         if (srv_name_slash == NULL) {
 651                 DEBUG(0, ("talloc_asprintf failed\n"));
 652                 return WINBINDD_ERROR;
 653         }
 654
 655         do {
 656                 DOM_CRED clnt_creds;
 657                 ZERO_STRUCT(info3);
 658                 ZERO_STRUCT(ret_creds);
 659                 retry = False;
 660
 661                 result = cm_connect_netlogon(contact_domain, state->mem_ctx,
 662                                              &pipe_cli, &session_key,
 663                                              &credentials);
 664
 665                 if (!NT_STATUS_IS_OK(result)) {
 666                         DEBUG(3, ("could not open handle to NETLOGON pipe (error: %s)\n",
 667                                   nt_errstr(result)));
 668                         goto done;
 669                 }
 670
 671                 credentials->timestamp.time = time(NULL);
 672                 memcpy(&clnt_creds, credentials, sizeof(clnt_creds));
 673
 674                 /* Calculate the new credentials. */
 675                 cred_create(session_key, &credentials->challenge,
 676                             clnt_creds.timestamp, &(clnt_creds.challenge));
 677
 678                 result = rpccli_netlogon_sam_network_logon(pipe_cli,
 679                                                            state->mem_ctx,
 680                                                            srv_name_slash,
 681                                                            &clnt_creds,
 682                                                            &ret_creds,
 683                                                            name_user,
 684                                                            name_domain,
 685                                                            global_myname(),
 686                                                            state->request.data.auth_crap.chal,
 687                                                            lm_resp,
 688                                                            nt_resp, &info3,
 689                                                            session_key);
 690
 691                 attempts += 1;
 692
 693                 /* We have to try a second time as cm_connect_netlogon
 694                    might not yet have noticed that the DC has killed
 695                    our connection. */
 696
 697                 if (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)) {
 698                         retry = True;
 699                         continue;
 700                 }
 701
 702                 /* if we get access denied, a possible cause was that we had and open
 703                    connection to the DC, but someone changed our machine account password
 704                    out from underneath us using 'net rpc changetrustpw' */
 705
 706                 if ( NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) ) {
 707                         DEBUG(3,("winbindd_pam_auth: sam_logon returned "
 708                                  "ACCESS_DENIED.  Maybe the trust account "
 709                                 "password was changed and we didn't know it. "
 710                                  "Killing connections to domain %s\n",
 711                                 name_domain));
 712                         invalidate_cm_connection(&contact_domain->conn);
 713                         retry = True;
 714                 }
 715
 716         } while ( (attempts < 2) && retry );
 717
 718         /* Only check creds if we got a connection. */
 719         if (contact_domain->conn.cli &&
 720                         !(NT_STATUS_EQUAL(result, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND) ||
 721                                         (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)))) {
 722                 if (!clnt_deal_with_creds(session_key, credentials, &ret_creds)) {
 723                         DEBUG(3, ("DC %s sent wrong credentials\n",
 724                                 pipe_cli->cli->srv_name_slash));
 725                         result = NT_STATUS_ACCESS_DENIED;
 726                 }
 727         }
 728
 729         if (NT_STATUS_IS_OK(result)) {
 730                 netsamlogon_cache_store( state->mem_ctx, name_user, &info3 );
 731                 wcache_invalidate_samlogon(find_domain_from_name(name_domain), &info3);
 732
 733                 if (!NT_STATUS_IS_OK(result = check_info3_in_group(state->mem_ctx, &info3, state->request.data.auth_crap.require_membership_of_sid))) {
 734                         DEBUG(3, ("User %s is not in the required group (%s), so plaintext authentication is rejected\n",
 735                                   state->request.data.auth_crap.user,
 736                                   state->request.data.auth_crap.require_membership_of_sid));
 737                         goto done;
 738                 }
 739
 740                 if (state->request.flags & WBFLAG_PAM_INFO3_NDR) {
 741                         result = append_info3_as_ndr(state->mem_ctx, state, &info3);
 742                 } else if (state->request.flags & WBFLAG_PAM_UNIX_NAME) {
 743                         /* ntlm_auth should return the unix username, per
 744                            'winbind use default domain' settings and the like */
 745
 746                         fstring username_out;
 747                         const char *nt_username, *nt_domain;
 748                         if (!(nt_username = unistr2_tdup(state->mem_ctx, &(info3.uni_user_name)))) {
 749                                 /* If the server didn't give us one, just use the one we sent them */
 750                                 nt_username = name_user;
 751                         }
 752
 753                         if (!(nt_domain = unistr2_tdup(state->mem_ctx, &(info3.uni_logon_dom)))) {
 754                                 /* If the server didn't give us one, just use the one we sent them */
 755                                 nt_domain = name_domain;
 756                         }
 757
 758                         fill_domain_username(username_out, nt_domain, nt_username);
 759
 760                         DEBUG(5, ("Setting unix username to [%s]\n", username_out));
 761
 762                         state->response.extra_data = SMB_STRDUP(username_out);
 763                         if (!state->response.extra_data) {
 764                                 result = NT_STATUS_NO_MEMORY;
 765                                 goto done;
 766                         }
 767                         state->response.length +=  strlen(state->response.extra_data)+1;
 768                 }
 769
 770                 if (state->request.flags & WBFLAG_PAM_USER_SESSION_KEY) {
 771                         memcpy(state->response.data.auth.user_session_key, info3.user_sess_key, sizeof(state->response.data.auth.user_session_key) /* 16 */);
 772                 }
 773                 if (state->request.flags & WBFLAG_PAM_LMKEY) {
 774                         memcpy(state->response.data.auth.first_8_lm_hash, info3.lm_sess_key, sizeof(state->response.data.auth.first_8_lm_hash) /* 8 */);
 775                 }
 776         }
 777
 778 done:
 779         /* give us a more useful (more correct?) error code */
 780         if ((NT_STATUS_EQUAL(result, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND) || (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)))) {
 781                 result = NT_STATUS_NO_LOGON_SERVERS;
 782         }
 783
 784         if (state->request.flags & WBFLAG_PAM_NT_STATUS_SQUASH) {
 785                 result = nt_status_squash(result);
 786         }
 787
 788         state->response.data.auth.nt_status = NT_STATUS_V(result);
 789         fstrcpy(state->response.data.auth.nt_status_string, nt_errstr(result));
 790
 791         /* we might have given a more useful error above */
 792         if (!*state->response.data.auth.error_string)
 793                 fstrcpy(state->response.data.auth.error_string, get_friendly_nt_error_msg(result));
 794         state->response.data.auth.pam_error = nt_status_to_pam(result);
 795
 796         DEBUG(NT_STATUS_IS_OK(result) ? 5 : 2,
 797               ("NTLM CRAP authentication for user [%s]\\[%s] returned %s (PAM: %d)\n",
 798                name_domain,
 799                name_user,
 800                state->response.data.auth.nt_status_string,
 801                state->response.data.auth.pam_error));
 802
 803         return NT_STATUS_IS_OK(result) ? WINBINDD_OK : WINBINDD_ERROR;
 804 }
 805
 806 /* Change a user password */
 807
 808 void winbindd_pam_chauthtok(struct winbindd_cli_state *state)
 809 {
 810         NTSTATUS result;
 811         char *oldpass, *newpass;
 812         fstring domain, user;
 813         POLICY_HND dom_pol;
 814         struct winbindd_domain *contact_domain;
 815         struct rpc_pipe_client *cli;
 816
 817         DEBUG(3, ("[%5lu]: pam chauthtok %s\n", (unsigned long)state->pid,
 818                 state->request.data.chauthtok.user));
 819
 820         /* Setup crap */
 821
 822         parse_domain_user(state->request.data.chauthtok.user, domain, user);
 823
 824         if (!(contact_domain = find_domain_from_name(domain))) {
 825                 DEBUG(3, ("Cannot change password for [%s] -> [%s]\\[%s] as %s is not a trusted domain\n",
 826                           state->request.data.chauthtok.user, domain, user, domain));
 827                 result = NT_STATUS_NO_SUCH_USER;
 828                 goto done;
 829         }
 830
 831         /* Change password */
 832
 833         oldpass = state->request.data.chauthtok.oldpass;
 834         newpass = state->request.data.chauthtok.newpass;
 835
 836         /* Get sam handle */
 837
 838         result = cm_connect_sam(contact_domain, state->mem_ctx, &cli,
 839                                 &dom_pol);
 840         if (!NT_STATUS_IS_OK(result)) {
 841                 DEBUG(1, ("could not get SAM handle on DC for %s\n", domain));
 842                 goto done;
 843         }
 844
 845         result = rpccli_samr_chgpasswd_user(cli, state->mem_ctx, user, newpass,
 846                                             oldpass);
 847
 848 done:
 849         state->response.data.auth.nt_status = NT_STATUS_V(result);
 850         fstrcpy(state->response.data.auth.nt_status_string, nt_errstr(result));
 851         fstrcpy(state->response.data.auth.error_string, nt_errstr(result));
 852         state->response.data.auth.pam_error = nt_status_to_pam(result);
 853
 854         DEBUG(NT_STATUS_IS_OK(result) ? 5 : 2,
 855               ("Password change for user [%s]\\[%s] returned %s (PAM: %d)\n",
 856                domain,
 857                user,
 858                state->response.data.auth.nt_status_string,
 859                state->response.data.auth.pam_error));
 860
 861         if (NT_STATUS_IS_OK(result))
 862                 request_ok(state);
 863         else
 864                 request_error(state);
 865 }