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