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