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