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