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