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                 /* Check if the user is in the right group */
 420
 421                 if (!NT_STATUS_IS_OK(result = check_info3_in_group(state->mem_ctx, &info3, state->request.data.auth.require_membership_of_sid))) {
 422                         DEBUG(3, ("User %s is not in the required group (%s), so plaintext authentication is rejected\n",
 423                                   state->request.data.auth.user,
 424                                   state->request.data.auth.require_membership_of_sid));
 425                 }
 426         }
 427
 428 done:
 429         /* give us a more useful (more correct?) error code */
 430         if ((NT_STATUS_EQUAL(result, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND) || (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)))) {
 431                 result = NT_STATUS_NO_LOGON_SERVERS;
 432         }
 433
 434         state->response.data.auth.nt_status = NT_STATUS_V(result);
 435         fstrcpy(state->response.data.auth.nt_status_string, nt_errstr(result));
 436
 437         /* we might have given a more useful error above */
 438         if (!*state->response.data.auth.error_string)
 439                 fstrcpy(state->response.data.auth.error_string, get_friendly_nt_error_msg(result));
 440         state->response.data.auth.pam_error = nt_status_to_pam(result);
 441
 442         DEBUG(NT_STATUS_IS_OK(result) ? 5 : 2, ("Plain-text authentication for user %s returned %s (PAM: %d)\n",
 443               state->request.data.auth.user,
 444               state->response.data.auth.nt_status_string,
 445               state->response.data.auth.pam_error));
 446
 447         if ( NT_STATUS_IS_OK(result) &&
 448              (state->request.flags & WBFLAG_PAM_AFS_TOKEN) ) {
 449
 450                 char *afsname = SMB_STRDUP(lp_afs_username_map());
 451                 char *cell;
 452
 453                 if (afsname == NULL) goto no_token;
 454
 455                 afsname = realloc_string_sub(afsname, "%D", name_domain);
 456                 afsname = realloc_string_sub(afsname, "%u", name_user);
 457                 afsname = realloc_string_sub(afsname, "%U", name_user);
 458
 459                 {
 460                         DOM_SID user_sid;
 461                         fstring sidstr;
 462
 463                         sid_copy(&user_sid, &info3.dom_sid.sid);
 464                         sid_append_rid(&user_sid, info3.user_rid);
 465                         sid_to_string(sidstr, &user_sid);
 466                         afsname = realloc_string_sub(afsname, "%s", sidstr);
 467                 }
 468
 469                 if (afsname == NULL) goto no_token;
 470
 471                 strlower_m(afsname);
 472
 473                 DEBUG(10, ("Generating token for user %s\n", afsname));
 474
 475                 cell = strchr(afsname, '@');
 476
 477                 if (cell == NULL) goto no_token;
 478
 479                 *cell = '\0';
 480                 cell += 1;
 481
 482                 /* Append an AFS token string */
 483                 state->response.extra_data =
 484                         afs_createtoken_str(afsname, cell);
 485
 486                 if (state->response.extra_data != NULL)
 487                         state->response.length +=
 488                                 strlen(state->response.extra_data)+1;
 489
 490         no_token:
 491                 SAFE_FREE(afsname);
 492         }
 493
 494         return NT_STATUS_IS_OK(result) ? WINBINDD_OK : WINBINDD_ERROR;
 495 }
 496
 497 /**********************************************************************
 498  Challenge Response Authentication Protocol
 499 **********************************************************************/
 500
 501 void winbindd_pam_auth_crap(struct winbindd_cli_state *state)
 502 {
 503         struct winbindd_domain *domain = NULL;
 504         const char *domain_name = NULL;
 505         NTSTATUS result;
 506
 507         if (!state->privileged) {
 508                 char *error_string = NULL;
 509                 DEBUG(2, ("winbindd_pam_auth_crap: non-privileged access "
 510                           "denied.  !\n"));
 511                 DEBUGADD(2, ("winbindd_pam_auth_crap: Ensure permissions "
 512                              "on %s are set correctly.\n",
 513                              get_winbind_priv_pipe_dir()));
 514                 /* send a better message than ACCESS_DENIED */
 515                 error_string = talloc_asprintf(state->mem_ctx,
 516                                                "winbind client not authorized "
 517                                                "to use winbindd_pam_auth_crap."
 518                                                " Ensure permissions on %s "
 519                                                "are set correctly.",
 520                                                get_winbind_priv_pipe_dir());
 521                 fstrcpy(state->response.data.auth.error_string, error_string);
 522                 result = NT_STATUS_ACCESS_DENIED;
 523                 goto done;
 524         }
 525
 526         /* Ensure null termination */
 527         state->request.data.auth_crap.user
 528                 [sizeof(state->request.data.auth_crap.user)-1]=0;
 529         state->request.data.auth_crap.domain
 530                 [sizeof(state->request.data.auth_crap.domain)-1]=0;
 531
 532         DEBUG(3, ("[%5lu]: pam auth crap domain: [%s] user: %s\n",
 533                   (unsigned long)state->pid,
 534                   state->request.data.auth_crap.domain,
 535                   state->request.data.auth_crap.user));
 536
 537         if (*state->request.data.auth_crap.domain != '\0') {
 538                 domain_name = state->request.data.auth_crap.domain;
 539         } else if (lp_winbind_use_default_domain()) {
 540                 domain_name = lp_workgroup();
 541         }
 542
 543         if (domain_name != NULL)
 544                 domain = find_auth_domain(domain_name);
 545
 546         if (domain != NULL) {
 547                 sendto_domain(state, domain);
 548                 return;
 549         }
 550
 551         result = NT_STATUS_NO_SUCH_USER;
 552
 553  done:
 554         set_auth_errors(&state->response, result);
 555         DEBUG(5, ("CRAP authentication for %s returned %s (PAM: %d)\n",
 556                   state->request.data.auth.user,
 557                   state->response.data.auth.nt_status_string,
 558                   state->response.data.auth.pam_error));
 559         request_error(state);
 560         return;
 561 }
 562
 563
 564 enum winbindd_result winbindd_dual_pam_auth_crap(struct winbindd_domain *domain,
 565                                                  struct winbindd_cli_state *state)
 566 {
 567         NTSTATUS result;
 568         const char *srv_name_slash;
 569         NET_USER_INFO_3 info3;
 570         unsigned char *session_key;
 571         struct rpc_pipe_client *pipe_cli;
 572         DOM_CRED *credentials;
 573         const char *name_user = NULL;
 574         const char *name_domain = NULL;
 575         const char *workstation;
 576         struct winbindd_domain *contact_domain;
 577         DOM_CRED ret_creds;
 578         int attempts = 0;
 579         BOOL retry;
 580
 581         DATA_BLOB lm_resp, nt_resp;
 582
 583         /* This is child-only, so no check for privileged access is needed
 584            anymore */
 585
 586         /* Ensure null termination */
 587         state->request.data.auth_crap.user[sizeof(state->request.data.auth_crap.user)-1]=0;
 588         state->request.data.auth_crap.domain[sizeof(state->request.data.auth_crap.domain)-1]=0;
 589
 590         name_user = state->request.data.auth_crap.user;
 591
 592         if (*state->request.data.auth_crap.domain) {
 593                 name_domain = state->request.data.auth_crap.domain;
 594         } else if (lp_winbind_use_default_domain()) {
 595                 name_domain = lp_workgroup();
 596         } else {
 597                 DEBUG(5,("no domain specified with username (%s) - failing auth\n",
 598                          name_user));
 599                 result = NT_STATUS_NO_SUCH_USER;
 600                 goto done;
 601         }
 602
 603         DEBUG(3, ("[%5lu]: pam auth crap domain: %s user: %s\n", (unsigned long)state->pid,
 604                   name_domain, name_user));
 605
 606         if (*state->request.data.auth_crap.workstation) {
 607                 workstation = state->request.data.auth_crap.workstation;
 608         } else {
 609                 workstation = global_myname();
 610         }
 611
 612         if (state->request.data.auth_crap.lm_resp_len > sizeof(state->request.data.auth_crap.lm_resp)
 613                 || state->request.data.auth_crap.nt_resp_len > sizeof(state->request.data.auth_crap.nt_resp)) {
 614                 DEBUG(0, ("winbindd_pam_auth_crap: invalid password length %u/%u\n",
 615                           state->request.data.auth_crap.lm_resp_len,
 616                           state->request.data.auth_crap.nt_resp_len));
 617                 result = NT_STATUS_INVALID_PARAMETER;
 618                 goto done;
 619         }
 620
 621         lm_resp = data_blob_talloc(state->mem_ctx, state->request.data.auth_crap.lm_resp, state->request.data.auth_crap.lm_resp_len);
 622         nt_resp = data_blob_talloc(state->mem_ctx, state->request.data.auth_crap.nt_resp, state->request.data.auth_crap.nt_resp_len);
 623
 624
 625         /* what domain should we contact? */
 626
 627         if ( IS_DC ) {
 628                 if (!(contact_domain = find_domain_from_name(name_domain))) {
 629                         DEBUG(3, ("Authentication for domain for [%s] -> [%s]\\[%s] failed as %s is not a trusted domain\n",
 630                                   state->request.data.auth_crap.user, name_domain, name_user, name_domain));
 631                         result = NT_STATUS_NO_SUCH_USER;
 632                         goto done;
 633                 }
 634
 635         } else {
 636                 if (is_myname(name_domain)) {
 637                         DEBUG(3, ("Authentication for domain %s (local domain to this server) not supported at this stage\n", name_domain));
 638                         result =  NT_STATUS_NO_SUCH_USER;
 639                         goto done;
 640                 }
 641
 642                 contact_domain = find_our_domain();
 643         }
 644
 645         srv_name_slash = talloc_asprintf(state->mem_ctx, "\\\\%s",
 646                                          contact_domain->dcname);
 647         if (srv_name_slash == NULL) {
 648                 DEBUG(0, ("talloc_asprintf failed\n"));
 649                 return WINBINDD_ERROR;
 650         }
 651
 652         do {
 653                 DOM_CRED clnt_creds;
 654                 ZERO_STRUCT(info3);
 655                 ZERO_STRUCT(ret_creds);
 656                 retry = False;
 657
 658                 result = cm_connect_netlogon(contact_domain, state->mem_ctx,
 659                                              &pipe_cli, &session_key,
 660                                              &credentials);
 661
 662                 if (!NT_STATUS_IS_OK(result)) {
 663                         DEBUG(3, ("could not open handle to NETLOGON pipe (error: %s)\n",
 664                                   nt_errstr(result)));
 665                         goto done;
 666                 }
 667
 668                 credentials->timestamp.time = time(NULL);
 669                 memcpy(&clnt_creds, credentials, sizeof(clnt_creds));
 670
 671                 /* Calculate the new credentials. */
 672                 cred_create(session_key, &credentials->challenge,
 673                             clnt_creds.timestamp, &(clnt_creds.challenge));
 674
 675                 result = rpccli_netlogon_sam_network_logon(pipe_cli,
 676                                                            state->mem_ctx,
 677                                                            srv_name_slash,
 678                                                            &clnt_creds,
 679                                                            &ret_creds,
 680                                                            name_user,
 681                                                            name_domain,
 682                                                            global_myname(),
 683                                                            state->request.data.auth_crap.chal,
 684                                                            lm_resp,
 685                                                            nt_resp, &info3,
 686                                                            session_key);
 687
 688                 attempts += 1;
 689
 690                 /* We have to try a second time as cm_connect_netlogon
 691                    might not yet have noticed that the DC has killed
 692                    our connection. */
 693
 694                 if (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)) {
 695                         retry = True;
 696                         continue;
 697                 }
 698
 699                 /* if we get access denied, a possible cause was that we had and open
 700                    connection to the DC, but someone changed our machine account password
 701                    out from underneath us using 'net rpc changetrustpw' */
 702
 703                 if ( NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) ) {
 704                         DEBUG(3,("winbindd_pam_auth: sam_logon returned "
 705                                  "ACCESS_DENIED.  Maybe the trust account "
 706                                 "password was changed and we didn't know it. "
 707                                  "Killing connections to domain %s\n",
 708                                 name_domain));
 709                         invalidate_cm_connection(&contact_domain->conn);
 710                         retry = True;
 711                 }
 712
 713         } while ( (attempts < 2) && retry );
 714
 715         /* Only check creds if we got a connection. */
 716         if (contact_domain->conn.cli &&
 717                         !(NT_STATUS_EQUAL(result, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND) ||
 718                                         (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)))) {
 719                 if (!clnt_deal_with_creds(session_key, credentials, &ret_creds)) {
 720                         DEBUG(3, ("DC %s sent wrong credentials\n",
 721                                 pipe_cli->cli->srv_name_slash));
 722                         result = NT_STATUS_ACCESS_DENIED;
 723                 }
 724         }
 725
 726         if (NT_STATUS_IS_OK(result)) {
 727                 if (!NT_STATUS_IS_OK(result = check_info3_in_group(state->mem_ctx, &info3, state->request.data.auth_crap.require_membership_of_sid))) {
 728                         DEBUG(3, ("User %s is not in the required group (%s), so plaintext authentication is rejected\n",
 729                                   state->request.data.auth_crap.user,
 730                                   state->request.data.auth_crap.require_membership_of_sid));
 731                         goto done;
 732                 }
 733
 734                 if (state->request.flags & WBFLAG_PAM_INFO3_NDR) {
 735                         result = append_info3_as_ndr(state->mem_ctx, state, &info3);
 736                 } else if (state->request.flags & WBFLAG_PAM_UNIX_NAME) {
 737                         /* ntlm_auth should return the unix username, per
 738                            'winbind use default domain' settings and the like */
 739
 740                         fstring username_out;
 741                         const char *nt_username, *nt_domain;
 742                         if (!(nt_username = unistr2_tdup(state->mem_ctx, &(info3.uni_user_name)))) {
 743                                 /* If the server didn't give us one, just use the one we sent them */
 744                                 nt_username = name_user;
 745                         }
 746
 747                         if (!(nt_domain = unistr2_tdup(state->mem_ctx, &(info3.uni_logon_dom)))) {
 748                                 /* If the server didn't give us one, just use the one we sent them */
 749                                 nt_domain = name_domain;
 750                         }
 751
 752                         fill_domain_username(username_out, nt_domain, nt_username);
 753
 754                         DEBUG(5, ("Setting unix username to [%s]\n", username_out));
 755
 756                         state->response.extra_data = SMB_STRDUP(username_out);
 757                         if (!state->response.extra_data) {
 758                                 result = NT_STATUS_NO_MEMORY;
 759                                 goto done;
 760                         }
 761                         state->response.length +=  strlen(state->response.extra_data)+1;
 762                 }
 763
 764                 if (state->request.flags & WBFLAG_PAM_USER_SESSION_KEY) {
 765                         memcpy(state->response.data.auth.user_session_key, info3.user_sess_key, sizeof(state->response.data.auth.user_session_key) /* 16 */);
 766                 }
 767                 if (state->request.flags & WBFLAG_PAM_LMKEY) {
 768                         memcpy(state->response.data.auth.first_8_lm_hash, info3.lm_sess_key, sizeof(state->response.data.auth.first_8_lm_hash) /* 8 */);
 769                 }
 770         }
 771
 772 done:
 773         /* give us a more useful (more correct?) error code */
 774         if ((NT_STATUS_EQUAL(result, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND) || (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)))) {
 775                 result = NT_STATUS_NO_LOGON_SERVERS;
 776         }
 777
 778         if (state->request.flags & WBFLAG_PAM_NT_STATUS_SQUASH) {
 779                 result = nt_status_squash(result);
 780         }
 781
 782         state->response.data.auth.nt_status = NT_STATUS_V(result);
 783         fstrcpy(state->response.data.auth.nt_status_string, nt_errstr(result));
 784
 785         /* we might have given a more useful error above */
 786         if (!*state->response.data.auth.error_string)
 787                 fstrcpy(state->response.data.auth.error_string, get_friendly_nt_error_msg(result));
 788         state->response.data.auth.pam_error = nt_status_to_pam(result);
 789
 790         DEBUG(NT_STATUS_IS_OK(result) ? 5 : 2,
 791               ("NTLM CRAP authentication for user [%s]\\[%s] returned %s (PAM: %d)\n",
 792                name_domain,
 793                name_user,
 794                state->response.data.auth.nt_status_string,
 795                state->response.data.auth.pam_error));
 796
 797         return NT_STATUS_IS_OK(result) ? WINBINDD_OK : WINBINDD_ERROR;
 798 }
 799
 800 /* Change a user password */
 801
 802 void winbindd_pam_chauthtok(struct winbindd_cli_state *state)
 803 {
 804         NTSTATUS result;
 805         char *oldpass, *newpass;
 806         fstring domain, user;
 807         POLICY_HND dom_pol;
 808         struct winbindd_domain *contact_domain;
 809         struct rpc_pipe_client *cli;
 810
 811         DEBUG(3, ("[%5lu]: pam chauthtok %s\n", (unsigned long)state->pid,
 812                 state->request.data.chauthtok.user));
 813
 814         /* Setup crap */
 815
 816         parse_domain_user(state->request.data.chauthtok.user, domain, user);
 817
 818         if (!(contact_domain = find_domain_from_name(domain))) {
 819                 DEBUG(3, ("Cannot change password for [%s] -> [%s]\\[%s] as %s is not a trusted domain\n",
 820                           state->request.data.chauthtok.user, domain, user, domain));
 821                 result = NT_STATUS_NO_SUCH_USER;
 822                 goto done;
 823         }
 824
 825         /* Change password */
 826
 827         oldpass = state->request.data.chauthtok.oldpass;
 828         newpass = state->request.data.chauthtok.newpass;
 829
 830         /* Get sam handle */
 831
 832         result = cm_connect_sam(contact_domain, state->mem_ctx, &cli,
 833                                 &dom_pol);
 834         if (!NT_STATUS_IS_OK(result)) {
 835                 DEBUG(1, ("could not get SAM handle on DC for %s\n", domain));
 836                 goto done;
 837         }
 838
 839         result = rpccli_samr_chgpasswd_user(cli, state->mem_ctx, user, newpass,
 840                                             oldpass);
 841
 842 done:
 843         state->response.data.auth.nt_status = NT_STATUS_V(result);
 844         fstrcpy(state->response.data.auth.nt_status_string, nt_errstr(result));
 845         fstrcpy(state->response.data.auth.error_string, nt_errstr(result));
 846         state->response.data.auth.pam_error = nt_status_to_pam(result);
 847
 848         DEBUG(NT_STATUS_IS_OK(result) ? 5 : 2,
 849               ("Password change for user [%s]\\[%s] returned %s (PAM: %d)\n",
 850                domain,
 851                user,
 852                state->response.data.auth.nt_status_string,
 853                state->response.data.auth.pam_error));
 854
 855         if (NT_STATUS_IS_OK(result))
 856                 request_ok(state);
 857         else
 858                 request_error(state);
 859 }