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, False)) {
  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         NET_USER_INFO_3 info3;
 231         struct rpc_pipe_client *netlogon_pipe;
 232         uchar chal[8];
 233         DATA_BLOB lm_resp;
 234         DATA_BLOB nt_resp;
 235         int attempts = 0;
 236         unsigned char local_lm_response[24];
 237         unsigned char local_nt_response[24];
 238         struct winbindd_domain *contact_domain;
 239         BOOL retry;
 240
 241         /* Ensure null termination */
 242         state->request.data.auth.user[sizeof(state->request.data.auth.user)-1]='\0';
 243
 244         /* Ensure null termination */
 245         state->request.data.auth.pass[sizeof(state->request.data.auth.pass)-1]='\0';
 246
 247         DEBUG(3, ("[%5lu]: pam auth %s\n", (unsigned long)state->pid,
 248                   state->request.data.auth.user));
 249
 250         /* Parse domain and username */
 251
 252         parse_domain_user(state->request.data.auth.user, name_domain, name_user);
 253
 254         /* do password magic */
 255
 256
 257         generate_random_buffer(chal, 8);
 258         if (lp_client_ntlmv2_auth()) {
 259                 DATA_BLOB server_chal;
 260                 DATA_BLOB names_blob;
 261                 DATA_BLOB nt_response;
 262                 DATA_BLOB lm_response;
 263                 server_chal = data_blob_talloc(state->mem_ctx, chal, 8);
 264
 265                 /* note that the 'workgroup' here is a best guess - we don't know
 266                    the server's domain at this point.  The 'server name' is also
 267                    dodgy...
 268                 */
 269                 names_blob = NTLMv2_generate_names_blob(global_myname(), lp_workgroup());
 270
 271                 if (!SMBNTLMv2encrypt(name_user, name_domain,
 272                                       state->request.data.auth.pass,
 273                                       &server_chal,
 274                                       &names_blob,
 275                                       &lm_response, &nt_response, NULL)) {
 276                         data_blob_free(&names_blob);
 277                         data_blob_free(&server_chal);
 278                         DEBUG(0, ("winbindd_pam_auth: SMBNTLMv2encrypt() failed!\n"));
 279                         result = NT_STATUS_NO_MEMORY;
 280                         goto done;
 281                 }
 282                 data_blob_free(&names_blob);
 283                 data_blob_free(&server_chal);
 284                 lm_resp = data_blob_talloc(state->mem_ctx, lm_response.data,
 285                                            lm_response.length);
 286                 nt_resp = data_blob_talloc(state->mem_ctx, nt_response.data,
 287                                            nt_response.length);
 288                 data_blob_free(&lm_response);
 289                 data_blob_free(&nt_response);
 290
 291         } else {
 292                 if (lp_client_lanman_auth()
 293                     && SMBencrypt(state->request.data.auth.pass,
 294                                   chal,
 295                                   local_lm_response)) {
 296                         lm_resp = data_blob_talloc(state->mem_ctx,
 297                                                    local_lm_response,
 298                                                    sizeof(local_lm_response));
 299                 } else {
 300                         lm_resp = data_blob(NULL, 0);
 301                 }
 302                 SMBNTencrypt(state->request.data.auth.pass,
 303                              chal,
 304                              local_nt_response);
 305
 306                 nt_resp = data_blob_talloc(state->mem_ctx,
 307                                            local_nt_response,
 308                                            sizeof(local_nt_response));
 309         }
 310
 311         /* what domain should we contact? */
 312
 313         if ( IS_DC ) {
 314                 if (!(contact_domain = find_domain_from_name(name_domain))) {
 315                         DEBUG(3, ("Authentication for domain for [%s] -> [%s]\\[%s] failed as %s is not a trusted domain\n",
 316                                   state->request.data.auth.user, name_domain, name_user, name_domain));
 317                         result = NT_STATUS_NO_SUCH_USER;
 318                         goto done;
 319                 }
 320
 321         } else {
 322                 if (is_myname(name_domain)) {
 323                         DEBUG(3, ("Authentication for domain %s (local domain to this server) not supported at this stage\n", name_domain));
 324                         result =  NT_STATUS_NO_SUCH_USER;
 325                         goto done;
 326                 }
 327
 328                 contact_domain = find_our_domain();
 329         }
 330
 331         /* check authentication loop */
 332
 333         do {
 334
 335                 ZERO_STRUCT(info3);
 336                 retry = False;
 337
 338                 result = cm_connect_netlogon(contact_domain, &netlogon_pipe);
 339
 340                 if (!NT_STATUS_IS_OK(result)) {
 341                         DEBUG(3, ("could not open handle to NETLOGON pipe\n"));
 342                         goto done;
 343                 }
 344
 345                 result = rpccli_netlogon_sam_network_logon(netlogon_pipe,
 346                                                         state->mem_ctx,
 347                                                         contact_domain->dcname, /* server name */
 348                                                         name_user,              /* user name */
 349                                                         name_domain,            /* target domain */
 350                                                         global_myname(),        /* workstation */
 351                                                         chal,
 352                                                         lm_resp,
 353                                                         nt_resp,
 354                                                         &info3);
 355                 attempts += 1;
 356
 357                 /* We have to try a second time as cm_connect_netlogon
 358                    might not yet have noticed that the DC has killed
 359                    our connection. */
 360
 361                 if (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)) {
 362                         retry = True;
 363                         continue;
 364                 }
 365
 366                 /* if we get access denied, a possible cause was that we had
 367                    and open connection to the DC, but someone changed our
 368                    machine account password out from underneath us using 'net
 369                    rpc changetrustpw' */
 370
 371                 if ( NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) ) {
 372                         DEBUG(3,("winbindd_pam_auth: sam_logon returned "
 373                                  "ACCESS_DENIED.  Maybe the trust account "
 374                                 "password was changed and we didn't know it. "
 375                                  "Killing connections to domain %s\n",
 376                                 name_domain));
 377                         invalidate_cm_connection(&contact_domain->conn);
 378                         retry = True;
 379                 }
 380
 381         } while ( (attempts < 2) && retry );
 382
 383         if (NT_STATUS_IS_OK(result)) {
 384                 /* Check if the user is in the right group */
 385
 386                 if (!NT_STATUS_IS_OK(result = check_info3_in_group(state->mem_ctx, &info3,
 387                                         state->request.data.auth.require_membership_of_sid))) {
 388                         DEBUG(3, ("User %s is not in the required group (%s), so plaintext authentication is rejected\n",
 389                                   state->request.data.auth.user,
 390                                   state->request.data.auth.require_membership_of_sid));
 391                 }
 392         }
 393
 394 done:
 395
 396         /* give us a more useful (more correct?) error code */
 397         if ((NT_STATUS_EQUAL(result, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND) ||
 398                                 (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)))) {
 399                 result = NT_STATUS_NO_LOGON_SERVERS;
 400         }
 401
 402         state->response.data.auth.nt_status = NT_STATUS_V(result);
 403         fstrcpy(state->response.data.auth.nt_status_string, nt_errstr(result));
 404
 405         /* we might have given a more useful error above */
 406         if (!*state->response.data.auth.error_string)
 407                 fstrcpy(state->response.data.auth.error_string, get_friendly_nt_error_msg(result));
 408         state->response.data.auth.pam_error = nt_status_to_pam(result);
 409
 410         DEBUG(NT_STATUS_IS_OK(result) ? 5 : 2, ("Plain-text authentication for user %s returned %s (PAM: %d)\n",
 411               state->request.data.auth.user,
 412               state->response.data.auth.nt_status_string,
 413               state->response.data.auth.pam_error));
 414
 415         if ( NT_STATUS_IS_OK(result) &&
 416              (state->request.flags & WBFLAG_PAM_AFS_TOKEN) ) {
 417
 418                 char *afsname = SMB_STRDUP(lp_afs_username_map());
 419                 char *cell;
 420
 421                 if (afsname == NULL) {
 422                         goto no_token;
 423                 }
 424
 425                 afsname = realloc_string_sub(afsname, "%D", name_domain);
 426                 afsname = realloc_string_sub(afsname, "%u", name_user);
 427                 afsname = realloc_string_sub(afsname, "%U", name_user);
 428
 429                 {
 430                         DOM_SID user_sid;
 431                         fstring sidstr;
 432
 433                         sid_copy(&user_sid, &info3.dom_sid.sid);
 434                         sid_append_rid(&user_sid, info3.user_rid);
 435                         sid_to_string(sidstr, &user_sid);
 436                         afsname = realloc_string_sub(afsname, "%s", sidstr);
 437                 }
 438
 439                 if (afsname == NULL) {
 440                         goto no_token;
 441                 }
 442
 443                 strlower_m(afsname);
 444
 445                 DEBUG(10, ("Generating token for user %s\n", afsname));
 446
 447                 cell = strchr(afsname, '@');
 448
 449                 if (cell == NULL) {
 450                         goto no_token;
 451                 }
 452
 453                 *cell = '\0';
 454                 cell += 1;
 455
 456                 /* Append an AFS token string */
 457                 state->response.extra_data =
 458                         afs_createtoken_str(afsname, cell);
 459
 460                 if (state->response.extra_data != NULL)
 461                         state->response.length +=
 462                                 strlen(state->response.extra_data)+1;
 463
 464         no_token:
 465                 SAFE_FREE(afsname);
 466         }
 467
 468         return NT_STATUS_IS_OK(result) ? WINBINDD_OK : WINBINDD_ERROR;
 469 }
 470
 471 /**********************************************************************
 472  Challenge Response Authentication Protocol
 473 **********************************************************************/
 474
 475 void winbindd_pam_auth_crap(struct winbindd_cli_state *state)
 476 {
 477         struct winbindd_domain *domain = NULL;
 478         const char *domain_name = NULL;
 479         NTSTATUS result;
 480
 481         if (!state->privileged) {
 482                 char *error_string = NULL;
 483                 DEBUG(2, ("winbindd_pam_auth_crap: non-privileged access "
 484                           "denied.  !\n"));
 485                 DEBUGADD(2, ("winbindd_pam_auth_crap: Ensure permissions "
 486                              "on %s are set correctly.\n",
 487                              get_winbind_priv_pipe_dir()));
 488                 /* send a better message than ACCESS_DENIED */
 489                 error_string = talloc_asprintf(state->mem_ctx,
 490                                                "winbind client not authorized "
 491                                                "to use winbindd_pam_auth_crap."
 492                                                " Ensure permissions on %s "
 493                                                "are set correctly.",
 494                                                get_winbind_priv_pipe_dir());
 495                 fstrcpy(state->response.data.auth.error_string, error_string);
 496                 result = NT_STATUS_ACCESS_DENIED;
 497                 goto done;
 498         }
 499
 500         /* Ensure null termination */
 501         state->request.data.auth_crap.user
 502                 [sizeof(state->request.data.auth_crap.user)-1]=0;
 503         state->request.data.auth_crap.domain
 504                 [sizeof(state->request.data.auth_crap.domain)-1]=0;
 505
 506         DEBUG(3, ("[%5lu]: pam auth crap domain: [%s] user: %s\n",
 507                   (unsigned long)state->pid,
 508                   state->request.data.auth_crap.domain,
 509                   state->request.data.auth_crap.user));
 510
 511         if (*state->request.data.auth_crap.domain != '\0') {
 512                 domain_name = state->request.data.auth_crap.domain;
 513         } else if (lp_winbind_use_default_domain()) {
 514                 domain_name = lp_workgroup();
 515         }
 516
 517         if (domain_name != NULL)
 518                 domain = find_auth_domain(domain_name);
 519
 520         if (domain != NULL) {
 521                 sendto_domain(state, domain);
 522                 return;
 523         }
 524
 525         result = NT_STATUS_NO_SUCH_USER;
 526
 527  done:
 528         set_auth_errors(&state->response, result);
 529         DEBUG(5, ("CRAP authentication for %s returned %s (PAM: %d)\n",
 530                   state->request.data.auth.user,
 531                   state->response.data.auth.nt_status_string,
 532                   state->response.data.auth.pam_error));
 533         request_error(state);
 534         return;
 535 }
 536
 537
 538 enum winbindd_result winbindd_dual_pam_auth_crap(struct winbindd_domain *domain,
 539                                                  struct winbindd_cli_state *state)
 540 {
 541         NTSTATUS result;
 542         NET_USER_INFO_3 info3;
 543         struct rpc_pipe_client *netlogon_pipe;
 544         const char *name_user = NULL;
 545         const char *name_domain = NULL;
 546         const char *workstation;
 547         struct winbindd_domain *contact_domain;
 548         int attempts = 0;
 549         BOOL retry;
 550
 551         DATA_BLOB lm_resp, nt_resp;
 552
 553         /* This is child-only, so no check for privileged access is needed
 554            anymore */
 555
 556         /* Ensure null termination */
 557         state->request.data.auth_crap.user[sizeof(state->request.data.auth_crap.user)-1]=0;
 558         state->request.data.auth_crap.domain[sizeof(state->request.data.auth_crap.domain)-1]=0;
 559
 560         name_user = state->request.data.auth_crap.user;
 561
 562         if (*state->request.data.auth_crap.domain) {
 563                 name_domain = state->request.data.auth_crap.domain;
 564         } else if (lp_winbind_use_default_domain()) {
 565                 name_domain = lp_workgroup();
 566         } else {
 567                 DEBUG(5,("no domain specified with username (%s) - failing auth\n",
 568                          name_user));
 569                 result = NT_STATUS_NO_SUCH_USER;
 570                 goto done;
 571         }
 572
 573         DEBUG(3, ("[%5lu]: pam auth crap domain: %s user: %s\n", (unsigned long)state->pid,
 574                   name_domain, name_user));
 575
 576         if (*state->request.data.auth_crap.workstation) {
 577                 workstation = state->request.data.auth_crap.workstation;
 578         } else {
 579                 workstation = global_myname();
 580         }
 581
 582         if (state->request.data.auth_crap.lm_resp_len > sizeof(state->request.data.auth_crap.lm_resp)
 583                 || state->request.data.auth_crap.nt_resp_len > sizeof(state->request.data.auth_crap.nt_resp)) {
 584                 DEBUG(0, ("winbindd_pam_auth_crap: invalid password length %u/%u\n",
 585                           state->request.data.auth_crap.lm_resp_len,
 586                           state->request.data.auth_crap.nt_resp_len));
 587                 result = NT_STATUS_INVALID_PARAMETER;
 588                 goto done;
 589         }
 590
 591         lm_resp = data_blob_talloc(state->mem_ctx, state->request.data.auth_crap.lm_resp,
 592                                         state->request.data.auth_crap.lm_resp_len);
 593         nt_resp = data_blob_talloc(state->mem_ctx, state->request.data.auth_crap.nt_resp,
 594                                         state->request.data.auth_crap.nt_resp_len);
 595
 596         /* what domain should we contact? */
 597
 598         if ( IS_DC ) {
 599                 if (!(contact_domain = find_domain_from_name(name_domain))) {
 600                         DEBUG(3, ("Authentication for domain for [%s] -> [%s]\\[%s] failed as %s is not a trusted domain\n",
 601                                   state->request.data.auth_crap.user, name_domain, name_user, name_domain));
 602                         result = NT_STATUS_NO_SUCH_USER;
 603                         goto done;
 604                 }
 605         } else {
 606                 if (is_myname(name_domain)) {
 607                         DEBUG(3, ("Authentication for domain %s (local domain to this server) not supported at this stage\n", name_domain));
 608                         result =  NT_STATUS_NO_SUCH_USER;
 609                         goto done;
 610                 }
 611                 contact_domain = find_our_domain();
 612         }
 613
 614         do {
 615                 ZERO_STRUCT(info3);
 616                 retry = False;
 617
 618                 result = cm_connect_netlogon(contact_domain, &netlogon_pipe);
 619
 620                 if (!NT_STATUS_IS_OK(result)) {
 621                         DEBUG(3, ("could not open handle to NETLOGON pipe (error: %s)\n",
 622                                   nt_errstr(result)));
 623                         goto done;
 624                 }
 625
 626                 result = rpccli_netlogon_sam_network_logon(netlogon_pipe,
 627                                                         state->mem_ctx,
 628                                                         contact_domain->dcname,
 629                                                         name_user,
 630                                                         name_domain,
 631                                                         global_myname(),
 632                                                         state->request.data.auth_crap.chal,
 633                                                         lm_resp,
 634                                                         nt_resp,
 635                                                         &info3);
 636
 637                 attempts += 1;
 638
 639                 /* We have to try a second time as cm_connect_netlogon
 640                    might not yet have noticed that the DC has killed
 641                    our connection. */
 642
 643                 if (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)) {
 644                         retry = True;
 645                         continue;
 646                 }
 647
 648                 /* if we get access denied, a possible cause was that we had and open
 649                    connection to the DC, but someone changed our machine account password
 650                    out from underneath us using 'net rpc changetrustpw' */
 651
 652                 if ( NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) ) {
 653                         DEBUG(3,("winbindd_pam_auth: sam_logon returned "
 654                                  "ACCESS_DENIED.  Maybe the trust account "
 655                                 "password was changed and we didn't know it. "
 656                                  "Killing connections to domain %s\n",
 657                                 name_domain));
 658                         invalidate_cm_connection(&contact_domain->conn);
 659                         retry = True;
 660                 }
 661
 662         } while ( (attempts < 2) && retry );
 663
 664         if (NT_STATUS_IS_OK(result)) {
 665                 if (!NT_STATUS_IS_OK(result = check_info3_in_group(state->mem_ctx, &info3,
 666                                                         state->request.data.auth_crap.require_membership_of_sid))) {
 667                         DEBUG(3, ("User %s is not in the required group (%s), so plaintext authentication is rejected\n",
 668                                   state->request.data.auth_crap.user,
 669                                   state->request.data.auth_crap.require_membership_of_sid));
 670                         goto done;
 671                 }
 672
 673                 if (state->request.flags & WBFLAG_PAM_INFO3_NDR) {
 674                         result = append_info3_as_ndr(state->mem_ctx, state, &info3);
 675                 } else if (state->request.flags & WBFLAG_PAM_UNIX_NAME) {
 676                         /* ntlm_auth should return the unix username, per
 677                            'winbind use default domain' settings and the like */
 678
 679                         fstring username_out;
 680                         const char *nt_username, *nt_domain;
 681                         if (!(nt_username = unistr2_tdup(state->mem_ctx, &(info3.uni_user_name)))) {
 682                                 /* If the server didn't give us one, just use the one we sent them */
 683                                 nt_username = name_user;
 684                         }
 685
 686                         if (!(nt_domain = unistr2_tdup(state->mem_ctx, &(info3.uni_logon_dom)))) {
 687                                 /* If the server didn't give us one, just use the one we sent them */
 688                                 nt_domain = name_domain;
 689                         }
 690
 691                         fill_domain_username(username_out, nt_domain, nt_username);
 692
 693                         DEBUG(5, ("Setting unix username to [%s]\n", username_out));
 694
 695                         state->response.extra_data = SMB_STRDUP(username_out);
 696                         if (!state->response.extra_data) {
 697                                 result = NT_STATUS_NO_MEMORY;
 698                                 goto done;
 699                         }
 700                         state->response.length +=  strlen(state->response.extra_data)+1;
 701                 }
 702
 703                 if (state->request.flags & WBFLAG_PAM_USER_SESSION_KEY) {
 704                         memcpy(state->response.data.auth.user_session_key, info3.user_sess_key,
 705                                         sizeof(state->response.data.auth.user_session_key) /* 16 */);
 706                 }
 707                 if (state->request.flags & WBFLAG_PAM_LMKEY) {
 708                         memcpy(state->response.data.auth.first_8_lm_hash, info3.lm_sess_key,
 709                                         sizeof(state->response.data.auth.first_8_lm_hash) /* 8 */);
 710                 }
 711         }
 712
 713 done:
 714
 715         /* give us a more useful (more correct?) error code */
 716         if ((NT_STATUS_EQUAL(result, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND) ||
 717                                 (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)))) {
 718                 result = NT_STATUS_NO_LOGON_SERVERS;
 719         }
 720
 721         if (state->request.flags & WBFLAG_PAM_NT_STATUS_SQUASH) {
 722                 result = nt_status_squash(result);
 723         }
 724
 725         state->response.data.auth.nt_status = NT_STATUS_V(result);
 726         fstrcpy(state->response.data.auth.nt_status_string, nt_errstr(result));
 727
 728         /* we might have given a more useful error above */
 729         if (!*state->response.data.auth.error_string) {
 730                 fstrcpy(state->response.data.auth.error_string, get_friendly_nt_error_msg(result));
 731         }
 732         state->response.data.auth.pam_error = nt_status_to_pam(result);
 733
 734         DEBUG(NT_STATUS_IS_OK(result) ? 5 : 2,
 735               ("NTLM CRAP authentication for user [%s]\\[%s] returned %s (PAM: %d)\n",
 736                name_domain,
 737                name_user,
 738                state->response.data.auth.nt_status_string,
 739                state->response.data.auth.pam_error));
 740
 741         return NT_STATUS_IS_OK(result) ? WINBINDD_OK : WINBINDD_ERROR;
 742 }
 743
 744 /* Change a user password */
 745
 746 void winbindd_pam_chauthtok(struct winbindd_cli_state *state)
 747 {
 748         NTSTATUS result;
 749         char *oldpass, *newpass;
 750         fstring domain, user;
 751         POLICY_HND dom_pol;
 752         struct winbindd_domain *contact_domain;
 753         struct rpc_pipe_client *cli;
 754
 755         DEBUG(3, ("[%5lu]: pam chauthtok %s\n", (unsigned long)state->pid,
 756                 state->request.data.chauthtok.user));
 757
 758         /* Setup crap */
 759
 760         parse_domain_user(state->request.data.chauthtok.user, domain, user);
 761
 762         if (!(contact_domain = find_domain_from_name(domain))) {
 763                 DEBUG(3, ("Cannot change password for [%s] -> [%s]\\[%s] as %s is not a trusted domain\n",
 764                           state->request.data.chauthtok.user, domain, user, domain));
 765                 result = NT_STATUS_NO_SUCH_USER;
 766                 goto done;
 767         }
 768
 769         /* Change password */
 770
 771         oldpass = state->request.data.chauthtok.oldpass;
 772         newpass = state->request.data.chauthtok.newpass;
 773
 774         /* Get sam handle */
 775
 776         result = cm_connect_sam(contact_domain, state->mem_ctx, &cli,
 777                                 &dom_pol);
 778         if (!NT_STATUS_IS_OK(result)) {
 779                 DEBUG(1, ("could not get SAM handle on DC for %s\n", domain));
 780                 goto done;
 781         }
 782
 783         result = rpccli_samr_chgpasswd_user(cli, state->mem_ctx, user, newpass,
 784                                             oldpass);
 785
 786 done:
 787         state->response.data.auth.nt_status = NT_STATUS_V(result);
 788         fstrcpy(state->response.data.auth.nt_status_string, nt_errstr(result));
 789         fstrcpy(state->response.data.auth.error_string, nt_errstr(result));
 790         state->response.data.auth.pam_error = nt_status_to_pam(result);
 791
 792         DEBUG(NT_STATUS_IS_OK(result) ? 5 : 2,
 793               ("Password change for user [%s]\\[%s] returned %s (PAM: %d)\n",
 794                domain,
 795                user,
 796                state->response.data.auth.nt_status_string,
 797                state->response.data.auth.pam_error));
 798
 799         if (NT_STATUS_IS_OK(result))
 800                 request_ok(state);
 801         else
 802                 request_error(state);
 803 }