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