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 we are a DC and this is not our domain, then lookup an account
  67            for the domain trust */
  68
  69         if ( IS_DC && !strequal(domain, lp_workgroup()) && lp_allow_trusted_domains() )
  70         {
  71                 if ( !secrets_fetch_trusted_domain_password(domain, &pwd, &sid,
  72                         pass_last_set_time) )
  73                 {
  74                         DEBUG(0, ("get_trust_pw: could not fetch trust account "
  75                                   "password for trusted domain %s\n", domain));
  76                         return False;
  77                 }
  78
  79                 *channel = SEC_CHAN_DOMAIN;
  80                 E_md4hash(pwd, ret_pwd);
  81                 SAFE_FREE(pwd);
  82
  83                 return True;
  84         }
  85         else    /* just get the account for our domain (covers
  86                    ROLE_DOMAIN_MEMBER as well */
  87         {
  88                 /* get the machine trust account for our domain */
  89
  90                 if ( !secrets_fetch_trust_account_password (lp_workgroup(), ret_pwd,
  91                         pass_last_set_time, channel) )
  92                 {
  93                         DEBUG(0, ("get_trust_pw: could not fetch trust account "
  94                                   "password for my domain %s\n", domain));
  95                         return False;
  96                 }
  97
  98                 return True;
  99         }
 100
 101         /* Failure */
 102         return False;
 103 }
 104
 105 /**********************************************************************
 106  Authenticate a user with a clear test password
 107 **********************************************************************/
 108
 109 enum winbindd_result winbindd_pam_auth(struct winbindd_cli_state *state)
 110 {
 111         NTSTATUS result;
 112         fstring name_domain, name_user;
 113         unsigned char trust_passwd[16];
 114         time_t last_change_time;
 115         uint32 sec_channel_type;
 116         NET_USER_INFO_3 info3;
 117         struct cli_state *cli = NULL;
 118         uchar chal[8];
 119         TALLOC_CTX *mem_ctx = NULL;
 120         DATA_BLOB lm_resp;
 121         DATA_BLOB nt_resp;
 122         DOM_CRED ret_creds;
 123         int attempts = 0;
 124         unsigned char local_lm_response[24];
 125         unsigned char local_nt_response[24];
 126         const char *contact_domain;
 127
 128         /* Ensure null termination */
 129         state->request.data.auth.user[sizeof(state->request.data.auth.user)-1]='\0';
 130
 131         /* Ensure null termination */
 132         state->request.data.auth.pass[sizeof(state->request.data.auth.pass)-1]='\0';
 133
 134         DEBUG(3, ("[%5d]: pam auth %s\n", state->pid,
 135                   state->request.data.auth.user));
 136
 137         if (!(mem_ctx = talloc_init("winbind pam auth for %s", state->request.data.auth.user))) {
 138                 DEBUG(0, ("winbindd_pam_auth: could not talloc_init()!\n"));
 139                 result = NT_STATUS_NO_MEMORY;
 140                 goto done;
 141         }
 142
 143         /* Parse domain and username */
 144
 145         if (!parse_domain_user(state->request.data.auth.user, name_domain,
 146                                name_user)) {
 147                 DEBUG(5,("no domain separator (%s) in username (%s) - failing auth\n", lp_winbind_separator(), state->request.data.auth.user));
 148                 result = NT_STATUS_INVALID_PARAMETER;
 149                 goto done;
 150         }
 151
 152         /* do password magic */
 153
 154         generate_random_buffer(chal, 8, False);
 155         SMBencrypt(state->request.data.auth.pass, chal, local_lm_response);
 156
 157         SMBNTencrypt(state->request.data.auth.pass, chal, local_nt_response);
 158
 159         lm_resp = data_blob_talloc(mem_ctx, local_lm_response, sizeof(local_lm_response));
 160         nt_resp = data_blob_talloc(mem_ctx, local_nt_response, sizeof(local_nt_response));
 161
 162         if ( !get_trust_pw(name_domain, trust_passwd, &last_change_time, &sec_channel_type) ) {
 163                 result = NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 164                 goto done;
 165         }
 166
 167         /* what domain should we contact? */
 168
 169         if ( IS_DC )
 170                 contact_domain = name_domain;
 171         else
 172                 contact_domain = lp_workgroup();
 173
 174         /* check authentication loop */
 175
 176         do {
 177                 ZERO_STRUCT(info3);
 178                 ZERO_STRUCT(ret_creds);
 179
 180                 /* Don't shut this down - it belongs to the connection cache code */
 181                 result = cm_get_netlogon_cli(contact_domain, trust_passwd,
 182                                              sec_channel_type, False, &cli);
 183
 184                 if (!NT_STATUS_IS_OK(result)) {
 185                         DEBUG(3, ("could not open handle to NETLOGON pipe\n"));
 186                         goto done;
 187                 }
 188
 189                 result = cli_netlogon_sam_network_logon(cli, mem_ctx,
 190                                                         &ret_creds,
 191                                                         name_user, name_domain,
 192                                                         global_myname(), chal,
 193                                                         lm_resp, nt_resp,
 194                                                         &info3);
 195                 attempts += 1;
 196
 197                 /* if we get access denied, a possible cuase was that we had and open
 198                    connection to the DC, but someone changed our machine accoutn password
 199                    out from underneath us using 'net rpc changetrustpw' */
 200
 201                 if ( NT_STATUS_V(result) == NT_STATUS_V(NT_STATUS_ACCESS_DENIED) ) {
 202                         DEBUG(3,("winbindd_pam_auth: sam_logon returned ACCESS_DENIED.  Maybe the trust account "
 203                                 "password was changed and we didn't know it.  Killing connections to domain %s\n",
 204                                 name_domain));
 205                         winbindd_cm_flush();
 206                         cli->fd = -1;
 207                 }
 208
 209                 /* We have to try a second time as cm_get_netlogon_cli
 210                    might not yet have noticed that the DC has killed
 211                    our connection. */
 212
 213         } while ( (attempts < 2) && (cli->fd == -1) );
 214
 215
 216         clnt_deal_with_creds(cli->sess_key, &(cli->clnt_cred), &ret_creds);
 217
 218         if (NT_STATUS_IS_OK(result)) {
 219                 netsamlogon_cache_store( cli->mem_ctx, &info3 );
 220                 wcache_invalidate_samlogon(find_domain_from_name(name_domain), &info3);
 221         }
 222
 223
 224 done:
 225
 226         /* give us a more useful (more correct?) error code */
 227         if ((NT_STATUS_EQUAL(result, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND) || (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)))) {
 228                 result = NT_STATUS_NO_LOGON_SERVERS;
 229         }
 230
 231         state->response.data.auth.nt_status = NT_STATUS_V(result);
 232         fstrcpy(state->response.data.auth.nt_status_string, nt_errstr(result));
 233         fstrcpy(state->response.data.auth.error_string, get_friendly_nt_error_msg(result));
 234         state->response.data.auth.pam_error = nt_status_to_pam(result);
 235
 236         DEBUG(NT_STATUS_IS_OK(result) ? 5 : 2, ("Plain-text authentication for user %s returned %s (PAM: %d)\n",
 237               state->request.data.auth.user,
 238               state->response.data.auth.nt_status_string,
 239               state->response.data.auth.pam_error));
 240
 241         if (mem_ctx)
 242                 talloc_destroy(mem_ctx);
 243
 244         return NT_STATUS_IS_OK(result) ? WINBINDD_OK : WINBINDD_ERROR;
 245 }
 246
 247 /**********************************************************************
 248  Challenge Response Authentication Protocol
 249 **********************************************************************/
 250
 251 enum winbindd_result winbindd_pam_auth_crap(struct winbindd_cli_state *state)
 252 {
 253         NTSTATUS result;
 254         unsigned char trust_passwd[16];
 255         time_t last_change_time;
 256         uint32 sec_channel_type;
 257         NET_USER_INFO_3 info3;
 258         struct cli_state *cli = NULL;
 259         TALLOC_CTX *mem_ctx = NULL;
 260         char *user = NULL;
 261         const char *domain = NULL;
 262         const char *workstation;
 263         const char *contact_domain;
 264         DOM_CRED ret_creds;
 265         int attempts = 0;
 266
 267         DATA_BLOB lm_resp, nt_resp;
 268
 269         if (!state->privileged) {
 270                 DEBUG(2, ("winbindd_pam_auth_crap: non-privileged access denied!\n"));
 271                 /* send a better message than ACCESS_DENIED */
 272                 push_utf8_fstring(state->response.data.auth.error_string, "winbind client not authorized to use winbindd_pam_auth_crap");
 273                 result =  NT_STATUS_ACCESS_DENIED;
 274                 goto done;
 275         }
 276
 277         /* Ensure null termination */
 278         state->request.data.auth_crap.user[sizeof(state->request.data.auth_crap.user)-1]='\0';
 279
 280         /* Ensure null termination */
 281         state->request.data.auth_crap.domain[sizeof(state->request.data.auth_crap.domain)-1]='\0';
 282
 283         if (!(mem_ctx = talloc_init("winbind pam auth crap for (utf8) %s", state->request.data.auth_crap.user))) {
 284                 DEBUG(0, ("winbindd_pam_auth_crap: could not talloc_init()!\n"));
 285                 result = NT_STATUS_NO_MEMORY;
 286                 goto done;
 287         }
 288
 289         if (pull_utf8_talloc(mem_ctx, &user, state->request.data.auth_crap.user) == (size_t)-1) {
 290                 DEBUG(0, ("winbindd_pam_auth_crap: pull_utf8_talloc failed!\n"));
 291         }
 292
 293         if (*state->request.data.auth_crap.domain) {
 294                 char *dom = NULL;
 295                 if (pull_utf8_talloc(mem_ctx, &dom, state->request.data.auth_crap.domain) == (size_t)-1) {
 296                         DEBUG(0, ("winbindd_pam_auth_crap: pull_utf8_talloc failed!\n"));
 297                 }
 298                 domain = dom;
 299         } else if (lp_winbind_use_default_domain()) {
 300                 domain = lp_workgroup();
 301         } else {
 302                 DEBUG(5,("no domain specified with username (%s) - failing auth\n",
 303                          user));
 304                 result = NT_STATUS_INVALID_PARAMETER;
 305                 goto done;
 306         }
 307
 308         DEBUG(3, ("[%5d]: pam auth crap domain: %s user: %s\n", state->pid,
 309                   domain, user));
 310
 311         if ( !get_trust_pw(domain, trust_passwd, &last_change_time, &sec_channel_type) ) {
 312                 result = NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 313                 goto done;
 314         }
 315
 316         if (*state->request.data.auth_crap.workstation) {
 317                 char *wrk = NULL;
 318                 if (pull_utf8_talloc(mem_ctx, &wrk, state->request.data.auth_crap.workstation) == (size_t)-1) {
 319                         DEBUG(0, ("winbindd_pam_auth_crap: pull_utf8_talloc failed!\n"));
 320                 }
 321                 workstation = wrk;
 322         } else {
 323                 workstation = global_myname();
 324         }
 325
 326         if (state->request.data.auth_crap.lm_resp_len > sizeof(state->request.data.auth_crap.lm_resp)
 327                 || state->request.data.auth_crap.nt_resp_len > sizeof(state->request.data.auth_crap.nt_resp)) {
 328                 DEBUG(0, ("winbindd_pam_auth_crap: invalid password length %u/%u\n",
 329                           state->request.data.auth_crap.lm_resp_len,
 330                           state->request.data.auth_crap.nt_resp_len));
 331                 result = NT_STATUS_INVALID_PARAMETER;
 332                 goto done;
 333         }
 334
 335         lm_resp = data_blob_talloc(mem_ctx, state->request.data.auth_crap.lm_resp, state->request.data.auth_crap.lm_resp_len);
 336         nt_resp = data_blob_talloc(mem_ctx, state->request.data.auth_crap.nt_resp, state->request.data.auth_crap.nt_resp_len);
 337
 338         /* what domain should we contact? */
 339
 340         if ( IS_DC )
 341                 contact_domain = domain;
 342         else
 343                 contact_domain = lp_workgroup();
 344
 345         do {
 346                 ZERO_STRUCT(info3);
 347                 ZERO_STRUCT(ret_creds);
 348
 349                 /* Don't shut this down - it belongs to the connection cache code */
 350                 result = cm_get_netlogon_cli(contact_domain, trust_passwd, sec_channel_type, False, &cli);
 351
 352                 if (!NT_STATUS_IS_OK(result)) {
 353                         DEBUG(3, ("could not open handle to NETLOGON pipe (error: %s)\n",
 354                                   nt_errstr(result)));
 355                         goto done;
 356                 }
 357
 358                 result = cli_netlogon_sam_network_logon(cli, mem_ctx,
 359                                                         &ret_creds,
 360                                                         user, domain,
 361                                                         workstation,
 362                                                         state->request.data.auth_crap.chal,
 363                                                         lm_resp, nt_resp,
 364                                                         &info3);
 365
 366                 attempts += 1;
 367
 368                 /* if we get access denied, a possible cuase was that we had and open
 369                    connection to the DC, but someone changed our machine accoutn password
 370                    out from underneath us using 'net rpc changetrustpw' */
 371
 372                 if ( NT_STATUS_V(result) == NT_STATUS_V(NT_STATUS_ACCESS_DENIED) ) {
 373                         DEBUG(3,("winbindd_pam_auth_crap: sam_logon returned ACCESS_DENIED.  Maybe the trust account "
 374                                 "password was changed and we didn't know it.  Killing connections to domain %s\n",
 375                                 domain));
 376                         winbindd_cm_flush();
 377                         cli->fd = -1;
 378                 }
 379
 380                 /* We have to try a second time as cm_get_netlogon_cli
 381                    might not yet have noticed that the DC has killed
 382                    our connection. */
 383
 384         } while ( (attempts < 2) && (cli->fd == -1) );
 385
 386         clnt_deal_with_creds(cli->sess_key, &(cli->clnt_cred), &ret_creds);
 387
 388         if (NT_STATUS_IS_OK(result)) {
 389                 netsamlogon_cache_store( cli->mem_ctx, &info3 );
 390                 wcache_invalidate_samlogon(find_domain_from_name(domain), &info3);
 391
 392                 if (state->request.flags & WBFLAG_PAM_INFO3_NDR) {
 393                         result = append_info3_as_ndr(mem_ctx, state, &info3);
 394                 }
 395
 396                 if (state->request.flags & WBFLAG_PAM_NTKEY) {
 397                         memcpy(state->response.data.auth.nt_session_key, info3.user_sess_key, sizeof(state->response.data.auth.nt_session_key) /* 16 */);
 398                 }
 399                 if (state->request.flags & WBFLAG_PAM_LMKEY) {
 400                         memcpy(state->response.data.auth.first_8_lm_hash, info3.padding, sizeof(state->response.data.auth.first_8_lm_hash) /* 8 */);
 401                 }
 402         }
 403
 404 done:
 405
 406         /* give us a more useful (more correct?) error code */
 407         if ((NT_STATUS_EQUAL(result, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND) || (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)))) {
 408                 result = NT_STATUS_NO_LOGON_SERVERS;
 409         }
 410
 411         state->response.data.auth.nt_status = NT_STATUS_V(result);
 412         push_utf8_fstring(state->response.data.auth.nt_status_string, nt_errstr(result));
 413         if (!*state->response.data.auth.error_string)
 414                 push_utf8_fstring(state->response.data.auth.error_string, get_friendly_nt_error_msg(result));
 415         state->response.data.auth.pam_error = nt_status_to_pam(result);
 416
 417         DEBUG(NT_STATUS_IS_OK(result) ? 5 : 2,
 418               ("NTLM CRAP authentication for user [%s]\\[%s] returned %s (PAM: %d)\n",
 419                domain,
 420                user,
 421                state->response.data.auth.nt_status_string,
 422                state->response.data.auth.pam_error));
 423
 424         if (mem_ctx)
 425                 talloc_destroy(mem_ctx);
 426
 427         return NT_STATUS_IS_OK(result) ? WINBINDD_OK : WINBINDD_ERROR;
 428 }
 429
 430 /* Change a user password */
 431
 432 enum winbindd_result winbindd_pam_chauthtok(struct winbindd_cli_state *state)
 433 {
 434         NTSTATUS result;
 435         char *oldpass, *newpass;
 436         fstring domain, user;
 437         CLI_POLICY_HND *hnd;
 438
 439         DEBUG(3, ("[%5d]: pam chauthtok %s\n", state->pid,
 440                 state->request.data.chauthtok.user));
 441
 442         /* Setup crap */
 443
 444         if (state == NULL)
 445                 return WINBINDD_ERROR;
 446
 447         if (!parse_domain_user(state->request.data.chauthtok.user, domain,
 448                                user)) {
 449                 result = NT_STATUS_INVALID_PARAMETER;
 450                 goto done;
 451         }
 452
 453         /* Change password */
 454
 455         oldpass = state->request.data.chauthtok.oldpass;
 456         newpass = state->request.data.chauthtok.newpass;
 457
 458         /* Get sam handle */
 459
 460         if ( NT_STATUS_IS_ERR(result = cm_get_sam_handle(domain, &hnd)) ) {
 461                 DEBUG(1, ("could not get SAM handle on DC for %s\n", domain));
 462                 goto done;
 463         }
 464
 465         if (!cli_oem_change_password(hnd->cli, user, newpass, oldpass)) {
 466                 DEBUG(1, ("password change failed for user %s/%s\n", domain,
 467                           user));
 468                 result = NT_STATUS_WRONG_PASSWORD;
 469         } else {
 470                 result = NT_STATUS_OK;
 471         }
 472
 473 done:
 474         state->response.data.auth.nt_status = NT_STATUS_V(result);
 475         fstrcpy(state->response.data.auth.nt_status_string, nt_errstr(result));
 476         fstrcpy(state->response.data.auth.error_string, nt_errstr(result));
 477         state->response.data.auth.pam_error = nt_status_to_pam(result);
 478
 479         DEBUG(NT_STATUS_IS_OK(result) ? 5 : 2,
 480               ("Password change for user [%s]\\[%s] returned %s (PAM: %d)\n",
 481                domain,
 482                user,
 483                state->response.data.auth.nt_status_string,
 484                state->response.data.auth.pam_error));
 485
 486         return NT_STATUS_IS_OK(result) ? WINBINDD_OK : WINBINDD_ERROR;
 487 }