source3/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 "winbindd.h"
  26 #undef DBGC_CLASS
  27 #define DBGC_CLASS DBGC_WINBIND
  28
  29
  30 static NTSTATUS append_info3_as_ndr(TALLOC_CTX *mem_ctx,
  31                                     struct winbindd_cli_state *state,
  32                                     NET_USER_INFO_3 *info3)
  33 {
  34         prs_struct ps;
  35         uint32 size;
  36         if (!prs_init(&ps, 256 /* Random, non-zero number */, mem_ctx, MARSHALL)) {
  37                 return NT_STATUS_NO_MEMORY;
  38         }
  39         if (!net_io_user_info3("", info3, &ps, 1, 3)) {
  40                 prs_mem_free(&ps);
  41                 return NT_STATUS_UNSUCCESSFUL;
  42         }
  43
  44         size = prs_data_size(&ps);
  45         state->response.extra_data = malloc(size);
  46         if (!state->response.extra_data) {
  47                 prs_mem_free(&ps);
  48                 return NT_STATUS_NO_MEMORY;
  49         }
  50         prs_copy_all_data_out(state->response.extra_data, &ps);
  51         state->response.length += size;
  52         prs_mem_free(&ps);
  53         return NT_STATUS_OK;
  54 }
  55
  56 /*******************************************************************
  57  wrapper around retreiving the trsut account password
  58 *******************************************************************/
  59
  60 static BOOL get_trust_pw(const char *domain, uint8 ret_pwd[16],
  61                           time_t *pass_last_set_time, uint32 *channel)
  62 {
  63         DOM_SID sid;
  64         char *pwd;
  65
  66         if ( lp_server_role()==ROLE_DOMAIN_MEMBER || strequal(domain, lp_workgroup()) )
  67         {
  68                 /*
  69                  * Get the machine account password for the domain to contact.
  70                  * This is either our own domain for a workstation, or possibly
  71                  * any domain for a PDC with trusted domains.
  72                  */
  73
  74                 if ( !secrets_fetch_trust_account_password (domain, ret_pwd,
  75                         pass_last_set_time, channel) )
  76                 {
  77                         DEBUG(0, ("get_trust_pw: could not fetch trust account "
  78                                   "password for my domain %s\n", domain));
  79                         return False;
  80                 }
  81
  82                 return True;
  83         }
  84         else if ( lp_allow_trusted_domains() )
  85         {
  86                 /* if we are not a domain member, then we must be a DC and
  87                    this must be a trusted domain */
  88
  89                 if ( !secrets_fetch_trusted_domain_password(domain, &pwd, &sid,
  90                         pass_last_set_time) )
  91                 {
  92                         DEBUG(0, ("get_trust_pw: could not fetch trust account "
  93                                   "password for trusted domain %s\n", domain));
  94                         return False;
  95                 }
  96
  97                 *channel = SEC_CHAN_DOMAIN;
  98                 E_md4hash(pwd, ret_pwd);
  99                 SAFE_FREE(pwd);
 100
 101                 return True;
 102         }
 103
 104         /* Failure */
 105         return False;
 106 }
 107
 108 /**********************************************************************
 109  Authenticate a user with a clear test password
 110 **********************************************************************/
 111
 112 enum winbindd_result winbindd_pam_auth(struct winbindd_cli_state *state)
 113 {
 114         NTSTATUS result;
 115         fstring name_domain, name_user;
 116         unsigned char trust_passwd[16];
 117         time_t last_change_time;
 118         uint32 sec_channel_type;
 119         NET_USER_INFO_3 info3;
 120         struct cli_state *cli = NULL;
 121         uchar chal[8];
 122         TALLOC_CTX *mem_ctx = NULL;
 123         DATA_BLOB lm_resp;
 124         DATA_BLOB nt_resp;
 125         DOM_CRED ret_creds;
 126         int attempts = 0;
 127         unsigned char local_lm_response[24];
 128         unsigned char local_nt_response[24];
 129
 130         /* Ensure null termination */
 131         state->request.data.auth.user[sizeof(state->request.data.auth.user)-1]='\0';
 132
 133         /* Ensure null termination */
 134         state->request.data.auth.pass[sizeof(state->request.data.auth.pass)-1]='\0';
 135
 136         DEBUG(3, ("[%5d]: pam auth %s\n", state->pid,
 137                   state->request.data.auth.user));
 138
 139         if (!(mem_ctx = talloc_init("winbind pam auth for %s", state->request.data.auth.user))) {
 140                 DEBUG(0, ("winbindd_pam_auth: could not talloc_init()!\n"));
 141                 result = NT_STATUS_NO_MEMORY;
 142                 goto done;
 143         }
 144
 145         /* Parse domain and username */
 146
 147         if (!parse_domain_user(state->request.data.auth.user, name_domain,
 148                                name_user)) {
 149                 DEBUG(5,("no domain separator (%s) in username (%s) - failing auth\n", lp_winbind_separator(), state->request.data.auth.user));
 150                 result = NT_STATUS_INVALID_PARAMETER;
 151                 goto done;
 152         }
 153
 154         /* do password magic */
 155
 156         generate_random_buffer(chal, 8, False);
 157         SMBencrypt(state->request.data.auth.pass, chal, local_lm_response);
 158
 159         SMBNTencrypt(state->request.data.auth.pass, chal, local_nt_response);
 160
 161         lm_resp = data_blob_talloc(mem_ctx, local_lm_response, sizeof(local_lm_response));
 162         nt_resp = data_blob_talloc(mem_ctx, local_nt_response, sizeof(local_nt_response));
 163
 164         if ( !get_trust_pw(name_domain, trust_passwd, &last_change_time, &sec_channel_type) ) {
 165                 result = NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 166                 goto done;
 167         }
 168
 169         /* check authentication loop */
 170
 171         do {
 172                 ZERO_STRUCT(info3);
 173                 ZERO_STRUCT(ret_creds);
 174
 175                 /* Don't shut this down - it belongs to the connection cache code */
 176                 result = cm_get_netlogon_cli(name_domain, trust_passwd,
 177                                              sec_channel_type, False, &cli);
 178
 179                 if (!NT_STATUS_IS_OK(result)) {
 180                         DEBUG(3, ("could not open handle to NETLOGON pipe\n"));
 181                         goto done;
 182                 }
 183
 184                 result = cli_netlogon_sam_network_logon(cli, mem_ctx,
 185                                                         &ret_creds,
 186                                                         name_user, name_domain,
 187                                                         global_myname(), chal,
 188                                                         lm_resp, nt_resp,
 189                                                         &info3);
 190                 attempts += 1;
 191
 192                 /* if we get access denied, a possible cuase was that we had and open
 193                    connection to the DC, but someone changed our machine accoutn password
 194                    out from underneath us using 'net rpc changetrustpw' */
 195
 196                 if ( NT_STATUS_V(result) == NT_STATUS_V(NT_STATUS_ACCESS_DENIED) ) {
 197                         DEBUG(3,("winbindd_pam_auth: sam_logon returned ACCESS_DENIED.  Maybe the trust account "
 198                                 "password was changed and we didn't know it.  Killing connections to domain %s\n",
 199                                 name_domain));
 200                         winbindd_cm_flush();
 201                         cli->fd = -1;
 202                 }
 203
 204                 /* We have to try a second time as cm_get_netlogon_cli
 205                    might not yet have noticed that the DC has killed
 206                    our connection. */
 207
 208         } while ( (attempts < 2) && (cli->fd == -1) );
 209
 210
 211         clnt_deal_with_creds(cli->sess_key, &(cli->clnt_cred), &ret_creds);
 212
 213         if (NT_STATUS_IS_OK(result)) {
 214                 netsamlogon_cache_store( cli->mem_ctx, &info3 );
 215                 wcache_invalidate_samlogon(find_domain_from_name(name_domain), &info3);
 216         }
 217
 218
 219 done:
 220
 221         /* give us a more useful (more correct?) error code */
 222         if ((NT_STATUS_EQUAL(result, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND) || (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)))) {
 223                 result = NT_STATUS_NO_LOGON_SERVERS;
 224         }
 225
 226         state->response.data.auth.nt_status = NT_STATUS_V(result);
 227         fstrcpy(state->response.data.auth.nt_status_string, nt_errstr(result));
 228         fstrcpy(state->response.data.auth.error_string, get_friendly_nt_error_msg(result));
 229         state->response.data.auth.pam_error = nt_status_to_pam(result);
 230
 231         DEBUG(NT_STATUS_IS_OK(result) ? 5 : 2, ("Plain-text authentication for user %s returned %s (PAM: %d)\n",
 232               state->request.data.auth.user,
 233               state->response.data.auth.nt_status_string,
 234               state->response.data.auth.pam_error));
 235
 236         if (mem_ctx)
 237                 talloc_destroy(mem_ctx);
 238
 239         return NT_STATUS_IS_OK(result) ? WINBINDD_OK : WINBINDD_ERROR;
 240 }
 241
 242 /**********************************************************************
 243  Challenge Response Authentication Protocol
 244 **********************************************************************/
 245
 246 enum winbindd_result winbindd_pam_auth_crap(struct winbindd_cli_state *state)
 247 {
 248         NTSTATUS result;
 249         unsigned char trust_passwd[16];
 250         time_t last_change_time;
 251         uint32 sec_channel_type;
 252         NET_USER_INFO_3 info3;
 253         struct cli_state *cli = NULL;
 254         TALLOC_CTX *mem_ctx = NULL;
 255         char *user = NULL;
 256         const char *domain = NULL;
 257         const char *workstation;
 258         DOM_CRED ret_creds;
 259         int attempts = 0;
 260
 261         DATA_BLOB lm_resp, nt_resp;
 262
 263         if (!state->privileged) {
 264                 DEBUG(2, ("winbindd_pam_auth_crap: non-privileged access denied!\n"));
 265                 /* send a better message than ACCESS_DENIED */
 266                 push_utf8_fstring(state->response.data.auth.error_string, "winbind client not authorized to use winbindd_pam_auth_crap");
 267                 result =  NT_STATUS_ACCESS_DENIED;
 268                 goto done;
 269         }
 270
 271         /* Ensure null termination */
 272         state->request.data.auth_crap.user[sizeof(state->request.data.auth_crap.user)-1]='\0';
 273
 274         /* Ensure null termination */
 275         state->request.data.auth_crap.domain[sizeof(state->request.data.auth_crap.domain)-1]='\0';
 276
 277         if (!(mem_ctx = talloc_init("winbind pam auth crap for (utf8) %s", state->request.data.auth_crap.user))) {
 278                 DEBUG(0, ("winbindd_pam_auth_crap: could not talloc_init()!\n"));
 279                 result = NT_STATUS_NO_MEMORY;
 280                 goto done;
 281         }
 282
 283         if (pull_utf8_talloc(mem_ctx, &user, state->request.data.auth_crap.user) == (size_t)-1) {
 284                 DEBUG(0, ("winbindd_pam_auth_crap: pull_utf8_talloc failed!\n"));
 285         }
 286
 287         if (*state->request.data.auth_crap.domain) {
 288                 char *dom = NULL;
 289                 if (pull_utf8_talloc(mem_ctx, &dom, state->request.data.auth_crap.domain) == (size_t)-1) {
 290                         DEBUG(0, ("winbindd_pam_auth_crap: pull_utf8_talloc failed!\n"));
 291                 }
 292                 domain = dom;
 293         } else if (lp_winbind_use_default_domain()) {
 294                 domain = lp_workgroup();
 295         } else {
 296                 DEBUG(5,("no domain specified with username (%s) - failing auth\n",
 297                          user));
 298                 result = NT_STATUS_INVALID_PARAMETER;
 299                 goto done;
 300         }
 301
 302         DEBUG(3, ("[%5d]: pam auth crap domain: %s user: %s\n", state->pid,
 303                   domain, user));
 304
 305         if ( !get_trust_pw(domain, trust_passwd, &last_change_time, &sec_channel_type) ) {
 306                 result = NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 307                 goto done;
 308         }
 309
 310         if (*state->request.data.auth_crap.workstation) {
 311                 char *wrk = NULL;
 312                 if (pull_utf8_talloc(mem_ctx, &wrk, state->request.data.auth_crap.workstation) == (size_t)-1) {
 313                         DEBUG(0, ("winbindd_pam_auth_crap: pull_utf8_talloc failed!\n"));
 314                 }
 315                 workstation = wrk;
 316         } else {
 317                 workstation = global_myname();
 318         }
 319
 320         if (state->request.data.auth_crap.lm_resp_len > sizeof(state->request.data.auth_crap.lm_resp)
 321                 || state->request.data.auth_crap.nt_resp_len > sizeof(state->request.data.auth_crap.nt_resp)) {
 322                 DEBUG(0, ("winbindd_pam_auth_crap: invalid password length %u/%u\n",
 323                           state->request.data.auth_crap.lm_resp_len,
 324                           state->request.data.auth_crap.nt_resp_len));
 325                 result = NT_STATUS_INVALID_PARAMETER;
 326                 goto done;
 327         }
 328
 329         lm_resp = data_blob_talloc(mem_ctx, state->request.data.auth_crap.lm_resp, state->request.data.auth_crap.lm_resp_len);
 330         nt_resp = data_blob_talloc(mem_ctx, state->request.data.auth_crap.nt_resp, state->request.data.auth_crap.nt_resp_len);
 331
 332         do {
 333                 ZERO_STRUCT(info3);
 334                 ZERO_STRUCT(ret_creds);
 335
 336                 /* Don't shut this down - it belongs to the connection cache code */
 337                 result = cm_get_netlogon_cli(domain, trust_passwd, sec_channel_type, False, &cli);
 338
 339                 if (!NT_STATUS_IS_OK(result)) {
 340                         DEBUG(3, ("could not open handle to NETLOGON pipe (error: %s)\n",
 341                                   nt_errstr(result)));
 342                         goto done;
 343                 }
 344
 345                 result = cli_netlogon_sam_network_logon(cli, mem_ctx,
 346                                                         &ret_creds,
 347                                                         user, domain,
 348                                                         workstation,
 349                                                         state->request.data.auth_crap.chal,
 350                                                         lm_resp, nt_resp,
 351                                                         &info3);
 352
 353                 attempts += 1;
 354
 355                 /* if we get access denied, a possible cuase was that we had and open
 356                    connection to the DC, but someone changed our machine accoutn password
 357                    out from underneath us using 'net rpc changetrustpw' */
 358
 359                 if ( NT_STATUS_V(result) == NT_STATUS_V(NT_STATUS_ACCESS_DENIED) ) {
 360                         DEBUG(3,("winbindd_pam_auth_crap: sam_logon returned ACCESS_DENIED.  Maybe the trust account "
 361                                 "password was changed and we didn't know it.  Killing connections to domain %s\n",
 362                                 domain));
 363                         winbindd_cm_flush();
 364                         cli->fd = -1;
 365                 }
 366
 367                 /* We have to try a second time as cm_get_netlogon_cli
 368                    might not yet have noticed that the DC has killed
 369                    our connection. */
 370
 371         } while ( (attempts < 2) && (cli->fd == -1) );
 372
 373         clnt_deal_with_creds(cli->sess_key, &(cli->clnt_cred), &ret_creds);
 374
 375         if (NT_STATUS_IS_OK(result)) {
 376                 netsamlogon_cache_store( cli->mem_ctx, &info3 );
 377                 wcache_invalidate_samlogon(find_domain_from_name(domain), &info3);
 378
 379                 if (state->request.data.auth_crap.flags & WINBIND_PAM_INFO3_NDR) {
 380                         result = append_info3_as_ndr(mem_ctx, state, &info3);
 381                 }
 382
 383                 if (state->request.data.auth_crap.flags & WINBIND_PAM_NTKEY) {
 384                         memcpy(state->response.data.auth.nt_session_key, info3.user_sess_key, sizeof(state->response.data.auth.nt_session_key) /* 16 */);
 385                 }
 386                 if (state->request.data.auth_crap.flags & WINBIND_PAM_LMKEY) {
 387                         memcpy(state->response.data.auth.first_8_lm_hash, info3.padding, sizeof(state->response.data.auth.first_8_lm_hash) /* 8 */);
 388                 }
 389         }
 390
 391 done:
 392
 393         /* give us a more useful (more correct?) error code */
 394         if ((NT_STATUS_EQUAL(result, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND) || (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)))) {
 395                 result = NT_STATUS_NO_LOGON_SERVERS;
 396         }
 397
 398         state->response.data.auth.nt_status = NT_STATUS_V(result);
 399         push_utf8_fstring(state->response.data.auth.nt_status_string, nt_errstr(result));
 400         if (!*state->response.data.auth.error_string)
 401                 push_utf8_fstring(state->response.data.auth.error_string, get_friendly_nt_error_msg(result));
 402         state->response.data.auth.pam_error = nt_status_to_pam(result);
 403
 404         DEBUG(NT_STATUS_IS_OK(result) ? 5 : 2,
 405               ("NTLM CRAP authentication for user [%s]\\[%s] returned %s (PAM: %d)\n",
 406                domain,
 407                user,
 408                state->response.data.auth.nt_status_string,
 409                state->response.data.auth.pam_error));
 410
 411         if (mem_ctx)
 412                 talloc_destroy(mem_ctx);
 413
 414         return NT_STATUS_IS_OK(result) ? WINBINDD_OK : WINBINDD_ERROR;
 415 }
 416
 417 /* Change a user password */
 418
 419 enum winbindd_result winbindd_pam_chauthtok(struct winbindd_cli_state *state)
 420 {
 421         NTSTATUS result;
 422         char *oldpass, *newpass;
 423         fstring domain, user;
 424         CLI_POLICY_HND *hnd;
 425
 426         DEBUG(3, ("[%5d]: pam chauthtok %s\n", state->pid,
 427                 state->request.data.chauthtok.user));
 428
 429         /* Setup crap */
 430
 431         if (state == NULL)
 432                 return WINBINDD_ERROR;
 433
 434         if (!parse_domain_user(state->request.data.chauthtok.user, domain,
 435                                user)) {
 436                 result = NT_STATUS_INVALID_PARAMETER;
 437                 goto done;
 438         }
 439
 440         /* Change password */
 441
 442         oldpass = state->request.data.chauthtok.oldpass;
 443         newpass = state->request.data.chauthtok.newpass;
 444
 445         /* Get sam handle */
 446
 447         if ( NT_STATUS_IS_ERR(result = cm_get_sam_handle(domain, &hnd)) ) {
 448                 DEBUG(1, ("could not get SAM handle on DC for %s\n", domain));
 449                 goto done;
 450         }
 451
 452         if (!cli_oem_change_password(hnd->cli, user, newpass, oldpass)) {
 453                 DEBUG(1, ("password change failed for user %s/%s\n", domain,
 454                           user));
 455                 result = NT_STATUS_WRONG_PASSWORD;
 456         } else {
 457                 result = NT_STATUS_OK;
 458         }
 459
 460 done:
 461         state->response.data.auth.nt_status = NT_STATUS_V(result);
 462         fstrcpy(state->response.data.auth.nt_status_string, nt_errstr(result));
 463         fstrcpy(state->response.data.auth.error_string, nt_errstr(result));
 464         state->response.data.auth.pam_error = nt_status_to_pam(result);
 465
 466         DEBUG(NT_STATUS_IS_OK(result) ? 5 : 2,
 467               ("Password change for user [%s]\\[%s] returned %s (PAM: %d)\n",
 468                domain,
 469                user,
 470                state->response.data.auth.nt_status_string,
 471                state->response.data.auth.pam_error));
 472
 473         return NT_STATUS_IS_OK(result) ? WINBINDD_OK : WINBINDD_ERROR;
 474 }