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 = malloc(size);
  47         if (!state->response.extra_data) {
  48                 prs_mem_free(&ps);
  49                 return NT_STATUS_NO_MEMORY;
  50         }
  51         prs_copy_all_data_out(state->response.extra_data, &ps);
  52         state->response.length += size;
  53         prs_mem_free(&ps);
  54         return NT_STATUS_OK;
  55 }
  56
  57 /**********************************************************************
  58  Authenticate a user with a clear test password
  59 **********************************************************************/
  60
  61 enum winbindd_result winbindd_pam_auth(struct winbindd_cli_state *state)
  62 {
  63         NTSTATUS result;
  64         fstring name_domain, name_user;
  65         unsigned char trust_passwd[16];
  66         time_t last_change_time;
  67         uint32 sec_channel_type;
  68         NET_USER_INFO_3 info3;
  69         struct cli_state *cli = NULL;
  70         uchar chal[8];
  71         TALLOC_CTX *mem_ctx = NULL;
  72         DATA_BLOB lm_resp;
  73         DATA_BLOB nt_resp;
  74         DOM_CRED ret_creds;
  75         int attempts = 0;
  76         unsigned char local_lm_response[24];
  77         unsigned char local_nt_response[24];
  78         struct winbindd_domain *contact_domain;
  79         BOOL retry;
  80
  81         /* Ensure null termination */
  82         state->request.data.auth.user[sizeof(state->request.data.auth.user)-1]='\0';
  83
  84         /* Ensure null termination */
  85         state->request.data.auth.pass[sizeof(state->request.data.auth.pass)-1]='\0';
  86
  87         DEBUG(3, ("[%5lu]: pam auth %s\n", (unsigned long)state->pid,
  88                   state->request.data.auth.user));
  89
  90         if (!(mem_ctx = talloc_init("winbind pam auth for %s", state->request.data.auth.user))) {
  91                 DEBUG(0, ("winbindd_pam_auth: could not talloc_init()!\n"));
  92                 result = NT_STATUS_NO_MEMORY;
  93                 goto done;
  94         }
  95
  96         /* Parse domain and username */
  97
  98         parse_domain_user(state->request.data.auth.user, name_domain, name_user);
  99
 100         /* do password magic */
 101
 102         generate_random_buffer(chal, 8, False);
 103         SMBencrypt(state->request.data.auth.pass, chal, local_lm_response);
 104
 105         SMBNTencrypt(state->request.data.auth.pass, chal, local_nt_response);
 106
 107         lm_resp = data_blob_talloc(mem_ctx, local_lm_response, sizeof(local_lm_response));
 108         nt_resp = data_blob_talloc(mem_ctx, local_nt_response, sizeof(local_nt_response));
 109
 110         /* what domain should we contact? */
 111
 112         if ( IS_DC ) {
 113                 if (!(contact_domain = find_domain_from_name(name_domain))) {
 114                         DEBUG(3, ("Authentication for domain for [%s] -> [%s]\\[%s] failed as %s is not a trusted domain\n",
 115                                   state->request.data.auth.user, name_domain, name_user, name_domain));
 116                         result = NT_STATUS_NO_SUCH_USER;
 117                         goto done;
 118                 }
 119
 120         } else {
 121                 if (is_myname(name_domain)) {
 122                         DEBUG(3, ("Authentication for domain %s (local domain to this server) not supported at this stage\n", name_domain));
 123                         result =  NT_STATUS_NO_SUCH_USER;
 124                         goto done;
 125                 }
 126
 127                 if (!(contact_domain = find_our_domain())) {
 128                         DEBUG(1, ("Authenticatoin for [%s] -> [%s]\\[%s] in our domain failed - we can't find our domain!\n",
 129                                   state->request.data.auth.user, name_domain, name_user));
 130                         result = NT_STATUS_NO_SUCH_USER;
 131                         goto done;
 132                 }
 133         }
 134
 135         if ( !get_trust_pw(contact_domain->name, trust_passwd, &last_change_time, &sec_channel_type) ) {
 136                 result = NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 137                 goto done;
 138         }
 139
 140         /* check authentication loop */
 141
 142         do {
 143                 ZERO_STRUCT(info3);
 144                 ZERO_STRUCT(ret_creds);
 145                 retry = False;
 146
 147                 /* Don't shut this down - it belongs to the connection cache code */
 148                 result = cm_get_netlogon_cli(contact_domain, trust_passwd,
 149                                              sec_channel_type, False, &cli);
 150
 151                 if (!NT_STATUS_IS_OK(result)) {
 152                         DEBUG(3, ("could not open handle to NETLOGON pipe\n"));
 153                         goto done;
 154                 }
 155
 156                 result = cli_netlogon_sam_network_logon(cli, mem_ctx,
 157                                                         &ret_creds,
 158                                                         name_user, name_domain,
 159                                                         global_myname(), chal,
 160                                                         lm_resp, nt_resp,
 161                                                         &info3);
 162                 attempts += 1;
 163
 164                 /* We have to try a second time as cm_get_netlogon_cli
 165                    might not yet have noticed that the DC has killed
 166                    our connection. */
 167
 168                 if ( cli->fd == -1 ) {
 169                         retry = True;
 170                         continue;
 171                 }
 172
 173                 /* if we get access denied, a possible cuase was that we had and open
 174                    connection to the DC, but someone changed our machine account password
 175                    out from underneath us using 'net rpc changetrustpw' */
 176
 177                 if ( NT_STATUS_V(result) == NT_STATUS_V(NT_STATUS_ACCESS_DENIED) ) {
 178                         DEBUG(3,("winbindd_pam_auth: sam_logon returned ACCESS_DENIED.  Maybe the trust account "
 179                                 "password was changed and we didn't know it.  Killing connections to domain %s\n",
 180                                 name_domain));
 181                         winbindd_cm_flush();
 182                         retry = True;
 183                         cli = NULL;
 184                 }
 185
 186         } while ( (attempts < 2) && retry );
 187
 188         clnt_deal_with_creds(cli->sess_key, &(cli->clnt_cred), &ret_creds);
 189
 190         if (NT_STATUS_IS_OK(result)) {
 191                 netsamlogon_cache_store( cli->mem_ctx, &info3 );
 192                 wcache_invalidate_samlogon(find_domain_from_name(name_domain), &info3);
 193         }
 194
 195 done:
 196         /* give us a more useful (more correct?) error code */
 197         if ((NT_STATUS_EQUAL(result, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND) || (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)))) {
 198                 result = NT_STATUS_NO_LOGON_SERVERS;
 199         }
 200
 201         state->response.data.auth.nt_status = NT_STATUS_V(result);
 202         fstrcpy(state->response.data.auth.nt_status_string, nt_errstr(result));
 203
 204         /* we might have given a more useful error above */
 205         if (!*state->response.data.auth.error_string)
 206                 fstrcpy(state->response.data.auth.error_string, get_friendly_nt_error_msg(result));
 207         state->response.data.auth.pam_error = nt_status_to_pam(result);
 208
 209         DEBUG(NT_STATUS_IS_OK(result) ? 5 : 2, ("Plain-text authentication for user %s returned %s (PAM: %d)\n",
 210               state->request.data.auth.user,
 211               state->response.data.auth.nt_status_string,
 212               state->response.data.auth.pam_error));
 213
 214         if (mem_ctx)
 215                 talloc_destroy(mem_ctx);
 216
 217         return NT_STATUS_IS_OK(result) ? WINBINDD_OK : WINBINDD_ERROR;
 218 }
 219
 220 /**********************************************************************
 221  Challenge Response Authentication Protocol
 222 **********************************************************************/
 223
 224 enum winbindd_result winbindd_pam_auth_crap(struct winbindd_cli_state *state)
 225 {
 226         NTSTATUS result;
 227         unsigned char trust_passwd[16];
 228         time_t last_change_time;
 229         uint32 sec_channel_type;
 230         NET_USER_INFO_3 info3;
 231         struct cli_state *cli = NULL;
 232         TALLOC_CTX *mem_ctx = NULL;
 233         char *name_user = NULL;
 234         const char *name_domain = NULL;
 235         const char *workstation;
 236         struct winbindd_domain *contact_domain;
 237         DOM_CRED ret_creds;
 238         int attempts = 0;
 239         BOOL retry;
 240
 241         DATA_BLOB lm_resp, nt_resp;
 242
 243         if (!state->privileged) {
 244                 char *error_string = NULL;
 245                 DEBUG(2, ("winbindd_pam_auth_crap: non-privileged access denied.  !\n"));
 246                 DEBUGADD(2, ("winbindd_pam_auth_crap: Ensure permissions on %s are set correctly.\n",
 247                              get_winbind_priv_pipe_dir()));
 248                 /* send a better message than ACCESS_DENIED */
 249                 asprintf(&error_string, "winbind client not authorized to use winbindd_pam_auth_crap.  Ensure permissions on %s are set correctly.",
 250                          get_winbind_priv_pipe_dir());
 251                 push_utf8_fstring(state->response.data.auth.error_string, error_string);
 252                 SAFE_FREE(error_string);
 253                 result =  NT_STATUS_ACCESS_DENIED;
 254                 goto done;
 255         }
 256
 257         /* Ensure null termination */
 258         state->request.data.auth_crap.user[sizeof(state->request.data.auth_crap.user)-1]=0;
 259         state->request.data.auth_crap.domain[sizeof(state->request.data.auth_crap.domain)-1]=0;
 260
 261         if (!(mem_ctx = talloc_init("winbind pam auth crap for (utf8) %s", state->request.data.auth_crap.user))) {
 262                 DEBUG(0, ("winbindd_pam_auth_crap: could not talloc_init()!\n"));
 263                 result = NT_STATUS_NO_MEMORY;
 264                 goto done;
 265         }
 266
 267         if (pull_utf8_talloc(mem_ctx, &name_user, state->request.data.auth_crap.user) == (size_t)-1) {
 268                 DEBUG(0, ("winbindd_pam_auth_crap: pull_utf8_talloc failed!\n"));
 269                 result = NT_STATUS_UNSUCCESSFUL;
 270                 goto done;
 271         }
 272
 273         if (*state->request.data.auth_crap.domain) {
 274                 char *dom = NULL;
 275                 if (pull_utf8_talloc(mem_ctx, &dom, state->request.data.auth_crap.domain) == (size_t)-1) {
 276                         DEBUG(0, ("winbindd_pam_auth_crap: pull_utf8_talloc failed!\n"));
 277                         result = NT_STATUS_UNSUCCESSFUL;
 278                         goto done;
 279                 }
 280                 name_domain = dom;
 281         } else if (lp_winbind_use_default_domain()) {
 282                 name_domain = lp_workgroup();
 283         } else {
 284                 DEBUG(5,("no domain specified with username (%s) - failing auth\n",
 285                          name_user));
 286                 result = NT_STATUS_NO_SUCH_USER;
 287                 goto done;
 288         }
 289
 290         DEBUG(3, ("[%5lu]: pam auth crap domain: %s user: %s\n", (unsigned long)state->pid,
 291                   name_domain, name_user));
 292
 293         if (*state->request.data.auth_crap.workstation) {
 294                 char *wrk = NULL;
 295                 if (pull_utf8_talloc(mem_ctx, &wrk, state->request.data.auth_crap.workstation) == (size_t)-1) {
 296                         DEBUG(0, ("winbindd_pam_auth_crap: pull_utf8_talloc failed!\n"));
 297                         result = NT_STATUS_UNSUCCESSFUL;
 298                         goto done;
 299                 }
 300                 workstation = wrk;
 301         } else {
 302                 workstation = global_myname();
 303         }
 304
 305         if (state->request.data.auth_crap.lm_resp_len > sizeof(state->request.data.auth_crap.lm_resp)
 306                 || state->request.data.auth_crap.nt_resp_len > sizeof(state->request.data.auth_crap.nt_resp)) {
 307                 DEBUG(0, ("winbindd_pam_auth_crap: invalid password length %u/%u\n",
 308                           state->request.data.auth_crap.lm_resp_len,
 309                           state->request.data.auth_crap.nt_resp_len));
 310                 result = NT_STATUS_INVALID_PARAMETER;
 311                 goto done;
 312         }
 313
 314         lm_resp = data_blob_talloc(mem_ctx, state->request.data.auth_crap.lm_resp, state->request.data.auth_crap.lm_resp_len);
 315         nt_resp = data_blob_talloc(mem_ctx, state->request.data.auth_crap.nt_resp, state->request.data.auth_crap.nt_resp_len);
 316
 317         /* what domain should we contact? */
 318
 319
 320         /* what domain should we contact? */
 321
 322         if ( IS_DC ) {
 323                 if (!(contact_domain = find_domain_from_name(name_domain))) {
 324                         DEBUG(3, ("Authentication for domain for [%s] -> [%s]\\[%s] failed as %s is not a trusted domain\n",
 325                                   state->request.data.auth.user, name_domain, name_user, name_domain));
 326                         result = NT_STATUS_NO_SUCH_USER;
 327                         goto done;
 328                 }
 329
 330         } else {
 331                 if (is_myname(name_domain)) {
 332                         DEBUG(3, ("Authentication for domain %s (local domain to this server) not supported at this stage\n", name_domain));
 333                         result =  NT_STATUS_NO_SUCH_USER;
 334                         goto done;
 335                 }
 336
 337                 if (!(contact_domain = find_our_domain())) {
 338                         DEBUG(1, ("Authenticatoin for [%s] -> [%s]\\[%s] in our domain failed - we can't find our domain!\n",
 339                                   state->request.data.auth.user, name_domain, name_user));
 340                         result = NT_STATUS_NO_SUCH_USER;
 341                         goto done;
 342                 }
 343         }
 344
 345         if ( !get_trust_pw(contact_domain->name, trust_passwd, &last_change_time, &sec_channel_type) ) {
 346                 result = NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 347                 goto done;
 348         }
 349
 350         do {
 351                 ZERO_STRUCT(info3);
 352                 ZERO_STRUCT(ret_creds);
 353                 retry = False;
 354
 355                 /* Don't shut this down - it belongs to the connection cache code */
 356                 result = cm_get_netlogon_cli(contact_domain, trust_passwd, sec_channel_type, False, &cli);
 357
 358                 if (!NT_STATUS_IS_OK(result)) {
 359                         DEBUG(3, ("could not open handle to NETLOGON pipe (error: %s)\n",
 360                                   nt_errstr(result)));
 361                         goto done;
 362                 }
 363
 364                 result = cli_netlogon_sam_network_logon(cli, mem_ctx,
 365                                                         &ret_creds,
 366                                                         name_user, name_domain,
 367                                                         workstation,
 368                                                         state->request.data.auth_crap.chal,
 369                                                         lm_resp, nt_resp,
 370                                                         &info3);
 371
 372                 attempts += 1;
 373
 374                 /* We have to try a second time as cm_get_netlogon_cli
 375                    might not yet have noticed that the DC has killed
 376                    our connection. */
 377
 378                 if ( cli->fd == -1 ) {
 379                         retry = True;
 380                         continue;
 381                 }
 382
 383                 /* if we get access denied, a possible cause was that we had and open
 384                    connection to the DC, but someone changed our machine account password
 385                    out from underneath us using 'net rpc changetrustpw' */
 386
 387                 if ( NT_STATUS_V(result) == NT_STATUS_V(NT_STATUS_ACCESS_DENIED) ) {
 388                         DEBUG(3,("winbindd_pam_auth_crap: sam_logon returned ACCESS_DENIED.  Maybe the trust account "
 389                                 "password was changed and we didn't know it.  Killing connections to domain %s\n",
 390                                 contact_domain->name));
 391                         winbindd_cm_flush();
 392                         retry = True;
 393                         cli = NULL;
 394                 }
 395
 396         } while ( (attempts < 2) && retry );
 397
 398         clnt_deal_with_creds(cli->sess_key, &(cli->clnt_cred), &ret_creds);
 399
 400         if (NT_STATUS_IS_OK(result)) {
 401                 netsamlogon_cache_store( cli->mem_ctx, &info3 );
 402                 wcache_invalidate_samlogon(find_domain_from_name(name_domain), &info3);
 403
 404                 if (state->request.flags & WBFLAG_PAM_INFO3_NDR) {
 405                         result = append_info3_as_ndr(mem_ctx, state, &info3);
 406                 } else if (state->request.flags & WBFLAG_PAM_UNIX_NAME) {
 407                         /* ntlm_auth should return the unix username, per
 408                            'winbind use default domain' settings and the like */
 409
 410                         fstring username_out;
 411                         const char *nt_username, *nt_domain;
 412                         if (!(nt_username = unistr2_tdup(mem_ctx, &(info3.uni_user_name)))) {
 413                                 /* If the server didn't give us one, just use the one we sent them */
 414                                 nt_username = name_user;
 415                         }
 416
 417                         if (!(nt_domain = unistr2_tdup(mem_ctx, &(info3.uni_logon_dom)))) {
 418                                 /* If the server didn't give us one, just use the one we sent them */
 419                                 nt_domain = name_domain;
 420                         }
 421
 422                         fill_domain_username(username_out, nt_domain, nt_username);
 423
 424                         DEBUG(5, ("Setting unix username to [%s]\n", username_out));
 425
 426                         /* this interface is in UTF8 */
 427                         if (push_utf8_allocate((char **)&state->response.extra_data, username_out) == -1) {
 428                                 result = NT_STATUS_NO_MEMORY;
 429                                 goto done;
 430                         }
 431                         state->response.length +=  strlen(state->response.extra_data)+1;
 432                 }
 433
 434                 if (state->request.flags & WBFLAG_PAM_NTKEY) {
 435                         memcpy(state->response.data.auth.nt_session_key, info3.user_sess_key, sizeof(state->response.data.auth.nt_session_key) /* 16 */);
 436                 }
 437                 if (state->request.flags & WBFLAG_PAM_LMKEY) {
 438                         memcpy(state->response.data.auth.first_8_lm_hash, info3.padding, sizeof(state->response.data.auth.first_8_lm_hash) /* 8 */);
 439                 }
 440         }
 441
 442 done:
 443         /* give us a more useful (more correct?) error code */
 444         if ((NT_STATUS_EQUAL(result, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND) || (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)))) {
 445                 result = NT_STATUS_NO_LOGON_SERVERS;
 446         }
 447
 448         state->response.data.auth.nt_status = NT_STATUS_V(result);
 449         push_utf8_fstring(state->response.data.auth.nt_status_string, nt_errstr(result));
 450
 451         /* we might have given a more useful error above */
 452         if (!*state->response.data.auth.error_string)
 453                 push_utf8_fstring(state->response.data.auth.error_string, get_friendly_nt_error_msg(result));
 454         state->response.data.auth.pam_error = nt_status_to_pam(result);
 455
 456         DEBUG(NT_STATUS_IS_OK(result) ? 5 : 2,
 457               ("NTLM CRAP authentication for user [%s]\\[%s] returned %s (PAM: %d)\n",
 458                name_domain,
 459                name_user,
 460                state->response.data.auth.nt_status_string,
 461                state->response.data.auth.pam_error));
 462
 463         if (mem_ctx)
 464                 talloc_destroy(mem_ctx);
 465
 466         return NT_STATUS_IS_OK(result) ? WINBINDD_OK : WINBINDD_ERROR;
 467 }
 468
 469 /* Change a user password */
 470
 471 enum winbindd_result winbindd_pam_chauthtok(struct winbindd_cli_state *state)
 472 {
 473         NTSTATUS result;
 474         char *oldpass, *newpass;
 475         fstring domain, user;
 476         CLI_POLICY_HND *hnd;
 477         TALLOC_CTX *mem_ctx;
 478         struct winbindd_domain *contact_domain;
 479
 480         DEBUG(3, ("[%5lu]: pam chauthtok %s\n", (unsigned long)state->pid,
 481                 state->request.data.chauthtok.user));
 482
 483         if (!(mem_ctx = talloc_init("winbind password change for (utf8) %s",
 484                                     state->request.data.chauthtok.user))) {
 485                 DEBUG(0, ("winbindd_pam_auth_crap: could not talloc_init()!\n"));
 486                 result = NT_STATUS_NO_MEMORY;
 487                 goto done;
 488         }
 489
 490         /* Setup crap */
 491
 492         if (state == NULL)
 493                 return WINBINDD_ERROR;
 494
 495         parse_domain_user(state->request.data.chauthtok.user, domain, user);
 496
 497         if (!(contact_domain = find_domain_from_name(domain))) {
 498                 DEBUG(3, ("Cannot change password for [%s] -> [%s]\\[%s] as %s is not a trusted domain\n",
 499                           state->request.data.chauthtok.user, domain, user, domain));
 500                 result = NT_STATUS_NO_SUCH_USER;
 501                 goto done;
 502         }
 503
 504         /* Change password */
 505
 506         oldpass = state->request.data.chauthtok.oldpass;
 507         newpass = state->request.data.chauthtok.newpass;
 508
 509         /* Get sam handle */
 510
 511         if ( NT_STATUS_IS_ERR(result = cm_get_sam_handle(contact_domain, &hnd)) ) {
 512                 DEBUG(1, ("could not get SAM handle on DC for %s\n", domain));
 513                 goto done;
 514         }
 515
 516         if (!cli_oem_change_password(hnd->cli, user, newpass, oldpass)) {
 517                 DEBUG(1, ("password change failed for user %s/%s\n", domain,
 518                           user));
 519                 result = NT_STATUS_WRONG_PASSWORD;
 520         } else {
 521                 result = NT_STATUS_OK;
 522         }
 523
 524 done:
 525         state->response.data.auth.nt_status = NT_STATUS_V(result);
 526         fstrcpy(state->response.data.auth.nt_status_string, nt_errstr(result));
 527         fstrcpy(state->response.data.auth.error_string, nt_errstr(result));
 528         state->response.data.auth.pam_error = nt_status_to_pam(result);
 529
 530         DEBUG(NT_STATUS_IS_OK(result) ? 5 : 2,
 531               ("Password change for user [%s]\\[%s] returned %s (PAM: %d)\n",
 532                domain,
 533                user,
 534                state->response.data.auth.nt_status_string,
 535                state->response.data.auth.pam_error));
 536
 537         if (mem_ctx)
 538                 talloc_destroy(mem_ctx);
 539
 540         return NT_STATUS_IS_OK(result) ? WINBINDD_OK : WINBINDD_ERROR;
 541 }