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 /* Return a password structure from a username.  */
  57
  58 enum winbindd_result winbindd_pam_auth(struct winbindd_cli_state *state)
  59 {
  60         NTSTATUS result;
  61         fstring name_domain, name_user;
  62         unsigned char trust_passwd[16];
  63         time_t last_change_time;
  64         uint32 sec_channel_type;
  65         NET_USER_INFO_3 info3;
  66         struct cli_state *cli = NULL;
  67         uchar chal[8];
  68         TALLOC_CTX *mem_ctx = NULL;
  69         DATA_BLOB lm_resp;
  70         DATA_BLOB nt_resp;
  71         DOM_CRED ret_creds;
  72         int attempts = 0;
  73
  74         /* Ensure null termination */
  75         state->request.data.auth.user[sizeof(state->request.data.auth.user)-1]='\0';
  76
  77         /* Ensure null termination */
  78         state->request.data.auth.pass[sizeof(state->request.data.auth.pass)-1]='\0';
  79
  80         DEBUG(3, ("[%5d]: pam auth %s\n", state->pid,
  81                   state->request.data.auth.user));
  82
  83         if (!(mem_ctx = talloc_init("winbind pam auth for %s", state->request.data.auth.user))) {
  84                 DEBUG(0, ("winbindd_pam_auth: could not talloc_init()!\n"));
  85                 result = NT_STATUS_NO_MEMORY;
  86                 goto done;
  87         }
  88
  89         /* Parse domain and username */
  90
  91         if (!parse_domain_user(state->request.data.auth.user, name_domain,
  92                                name_user)) {
  93                 DEBUG(5,("no domain separator (%s) in username (%s) - failing auth\n", lp_winbind_separator(), state->request.data.auth.user));
  94                 result = NT_STATUS_INVALID_PARAMETER;
  95                 goto done;
  96         }
  97
  98         {
  99                 unsigned char local_lm_response[24];
 100                 unsigned char local_nt_response[24];
 101
 102                 generate_random_buffer(chal, 8, False);
 103                 SMBencrypt(state->request.data.auth.pass, chal, local_lm_response);
 104
 105                 SMBNTencrypt(state->request.data.auth.pass, chal, local_nt_response);
 106
 107                 lm_resp = data_blob_talloc(mem_ctx, local_lm_response, sizeof(local_lm_response));
 108                 nt_resp = data_blob_talloc(mem_ctx, local_nt_response, sizeof(local_nt_response));
 109         }
 110
 111         /*
 112          * Get the machine account password for our primary domain
 113          */
 114
 115         if (!secrets_fetch_trust_account_password(
 116                 lp_workgroup(), trust_passwd, &last_change_time,
 117                 &sec_channel_type)) {
 118                 DEBUG(0, ("winbindd_pam_auth: could not fetch trust account "
 119                           "password for domain %s\n", lp_workgroup()));
 120                 result = NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 121                 goto done;
 122         }
 123
 124         do {
 125                 ZERO_STRUCT(info3);
 126                 ZERO_STRUCT(ret_creds);
 127
 128                 /* Don't shut this down - it belongs to the connection cache code */
 129                 result = cm_get_netlogon_cli(lp_workgroup(), trust_passwd,
 130                                              sec_channel_type, False, &cli);
 131
 132                 if (!NT_STATUS_IS_OK(result)) {
 133                         DEBUG(3, ("could not open handle to NETLOGON pipe\n"));
 134                         goto done;
 135                 }
 136
 137                 result = cli_netlogon_sam_network_logon(cli, mem_ctx,
 138                                                         &ret_creds,
 139                                                         name_user, name_domain,
 140                                                         global_myname(), chal,
 141                                                         lm_resp, nt_resp,
 142                                                         &info3);
 143                 attempts += 1;
 144
 145                 /* We have to try a second time as cm_get_netlogon_cli
 146                    might not yet have noticed that the DC has killed
 147                    our connection. */
 148
 149         } while ( (attempts < 2) && (cli->fd == -1) );
 150
 151
 152         clnt_deal_with_creds(cli->sess_key, &(cli->clnt_cred), &ret_creds);
 153
 154         uni_group_cache_store_netlogon(mem_ctx, &info3);
 155 done:
 156
 157         /* give us a more useful (more correct?) error code */
 158         if ((NT_STATUS_EQUAL(result, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND) || (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)))) {
 159                 result = NT_STATUS_NO_LOGON_SERVERS;
 160         }
 161
 162         state->response.data.auth.nt_status = NT_STATUS_V(result);
 163         fstrcpy(state->response.data.auth.nt_status_string, nt_errstr(result));
 164         fstrcpy(state->response.data.auth.error_string, get_friendly_nt_error_msg(result));
 165         state->response.data.auth.pam_error = nt_status_to_pam(result);
 166
 167         DEBUG(NT_STATUS_IS_OK(result) ? 5 : 2, ("Plain-text authentication for user %s returned %s (PAM: %d)\n",
 168               state->request.data.auth.user,
 169               state->response.data.auth.nt_status_string,
 170               state->response.data.auth.pam_error));
 171
 172         if (mem_ctx)
 173                 talloc_destroy(mem_ctx);
 174
 175         return NT_STATUS_IS_OK(result) ? WINBINDD_OK : WINBINDD_ERROR;
 176 }
 177
 178 /* Challenge Response Authentication Protocol */
 179
 180 enum winbindd_result winbindd_pam_auth_crap(struct winbindd_cli_state *state)
 181 {
 182         NTSTATUS result;
 183         unsigned char trust_passwd[16];
 184         time_t last_change_time;
 185         uint32 sec_channel_type;
 186         NET_USER_INFO_3 info3;
 187         struct cli_state *cli = NULL;
 188         TALLOC_CTX *mem_ctx = NULL;
 189         char *user = NULL;
 190         const char *domain = NULL;
 191         const char *contact_domain;
 192         const char *workstation;
 193         DOM_CRED ret_creds;
 194         int attempts = 0;
 195
 196         DATA_BLOB lm_resp, nt_resp;
 197
 198         if (!state->privileged) {
 199                 DEBUG(2, ("winbindd_pam_auth_crap: non-privileged access denied!\n"));
 200                 /* send a better message than ACCESS_DENIED */
 201                 push_utf8_fstring(state->response.data.auth.error_string, "winbind client not authorized to use winbindd_pam_auth_crap");
 202                 result =  NT_STATUS_ACCESS_DENIED;
 203                 goto done;
 204         }
 205
 206         /* Ensure null termination */
 207         state->request.data.auth_crap.user[sizeof(state->request.data.auth_crap.user)-1]='\0';
 208
 209         /* Ensure null termination */
 210         state->request.data.auth_crap.domain[sizeof(state->request.data.auth_crap.domain)-1]='\0';
 211
 212         if (!(mem_ctx = talloc_init("winbind pam auth crap for (utf8) %s", state->request.data.auth_crap.user))) {
 213                 DEBUG(0, ("winbindd_pam_auth_crap: could not talloc_init()!\n"));
 214                 result = NT_STATUS_NO_MEMORY;
 215                 goto done;
 216         }
 217
 218         if (pull_utf8_talloc(mem_ctx, &user, state->request.data.auth_crap.user) == (size_t)-1) {
 219                 DEBUG(0, ("winbindd_pam_auth_crap: pull_utf8_talloc failed!\n"));
 220         }
 221
 222         if (*state->request.data.auth_crap.domain) {
 223                 char *dom = NULL;
 224                 if (pull_utf8_talloc(mem_ctx, &dom, state->request.data.auth_crap.domain) == (size_t)-1) {
 225                         DEBUG(0, ("winbindd_pam_auth_crap: pull_utf8_talloc failed!\n"));
 226                 }
 227                 domain = dom;
 228         } else if (lp_winbind_use_default_domain()) {
 229                 domain = lp_workgroup();
 230         } else {
 231                 DEBUG(5,("no domain specified with username (%s) - failing auth\n",
 232                          user));
 233                 result = NT_STATUS_INVALID_PARAMETER;
 234                 goto done;
 235         }
 236
 237         DEBUG(3, ("[%5d]: pam auth crap domain: %s user: %s\n", state->pid,
 238                   domain, user));
 239
 240         if (lp_allow_trusted_domains() && (state->request.data.auth_crap.flags & WINBIND_PAM_CONTACT_TRUSTDOM)) {
 241                 contact_domain = domain;
 242         } else {
 243                 contact_domain = lp_workgroup();
 244         }
 245
 246         if (*state->request.data.auth_crap.workstation) {
 247                 char *wrk = NULL;
 248                 if (pull_utf8_talloc(mem_ctx, &wrk, state->request.data.auth_crap.workstation) == (size_t)-1) {
 249                         DEBUG(0, ("winbindd_pam_auth_crap: pull_utf8_talloc failed!\n"));
 250                 }
 251                 workstation = wrk;
 252         } else {
 253                 workstation = global_myname();
 254         }
 255
 256         if (state->request.data.auth_crap.lm_resp_len > sizeof(state->request.data.auth_crap.lm_resp)
 257                 || state->request.data.auth_crap.nt_resp_len > sizeof(state->request.data.auth_crap.nt_resp)) {
 258                 DEBUG(0, ("winbindd_pam_auth_crap: invalid password length %u/%u\n",
 259                           state->request.data.auth_crap.lm_resp_len,
 260                           state->request.data.auth_crap.nt_resp_len));
 261                 result = NT_STATUS_INVALID_PARAMETER;
 262                 goto done;
 263         }
 264
 265         lm_resp = data_blob_talloc(mem_ctx, state->request.data.auth_crap.lm_resp, state->request.data.auth_crap.lm_resp_len);
 266         nt_resp = data_blob_talloc(mem_ctx, state->request.data.auth_crap.nt_resp, state->request.data.auth_crap.nt_resp_len);
 267
 268         /*
 269          * Get the machine account password for the domain to contact.
 270          * This is either our own domain for a workstation, or possibly
 271          * any domain for a PDC with trusted domains.
 272          */
 273
 274         if (!secrets_fetch_trust_account_password (
 275                 contact_domain, trust_passwd, &last_change_time,
 276                 &sec_channel_type)) {
 277                 DEBUG(0, ("winbindd_pam_auth: could not fetch trust account "
 278                           "password for domain %s\n", contact_domain));
 279                 result = NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 280                 goto done;
 281         }
 282
 283         do {
 284                 ZERO_STRUCT(info3);
 285                 ZERO_STRUCT(ret_creds);
 286
 287                 /* Don't shut this down - it belongs to the connection cache code */
 288                 result = cm_get_netlogon_cli(contact_domain, trust_passwd,
 289                                              sec_channel_type, False, &cli);
 290
 291                 if (!NT_STATUS_IS_OK(result)) {
 292                         DEBUG(3, ("could not open handle to NETLOGON pipe (error: %s)\n",
 293                                   nt_errstr(result)));
 294                         goto done;
 295                 }
 296
 297                 result = cli_netlogon_sam_network_logon(cli, mem_ctx,
 298                                                         &ret_creds,
 299                                                         user, domain,
 300                                                         workstation,
 301                                                         state->request.data.auth_crap.chal,
 302                                                         lm_resp, nt_resp,
 303                                                         &info3);
 304
 305                 attempts += 1;
 306
 307                 /* We have to try a second time as cm_get_netlogon_cli
 308                    might not yet have noticed that the DC has killed
 309                    our connection. */
 310
 311         } while ( (attempts < 2) && (cli->fd == -1) );
 312
 313         clnt_deal_with_creds(cli->sess_key, &(cli->clnt_cred), &ret_creds);
 314
 315         if (NT_STATUS_IS_OK(result)) {
 316                 uni_group_cache_store_netlogon(mem_ctx, &info3);
 317                 if (state->request.data.auth_crap.flags & WINBIND_PAM_INFO3_NDR) {
 318                         result = append_info3_as_ndr(mem_ctx, state, &info3);
 319                 }
 320
 321                 if (state->request.data.auth_crap.flags & WINBIND_PAM_NTKEY) {
 322                         memcpy(state->response.data.auth.nt_session_key, info3.user_sess_key, sizeof(state->response.data.auth.nt_session_key) /* 16 */);
 323                 }
 324                 if (state->request.data.auth_crap.flags & WINBIND_PAM_LMKEY) {
 325                         memcpy(state->response.data.auth.first_8_lm_hash, info3.padding, sizeof(state->response.data.auth.first_8_lm_hash) /* 8 */);
 326                 }
 327         }
 328
 329 done:
 330
 331         /* give us a more useful (more correct?) error code */
 332         if ((NT_STATUS_EQUAL(result, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND) || (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)))) {
 333                 result = NT_STATUS_NO_LOGON_SERVERS;
 334         }
 335
 336         state->response.data.auth.nt_status = NT_STATUS_V(result);
 337         push_utf8_fstring(state->response.data.auth.nt_status_string, nt_errstr(result));
 338         if (!*state->response.data.auth.error_string)
 339                 push_utf8_fstring(state->response.data.auth.error_string, get_friendly_nt_error_msg(result));
 340         state->response.data.auth.pam_error = nt_status_to_pam(result);
 341
 342         DEBUG(NT_STATUS_IS_OK(result) ? 5 : 2,
 343               ("NTLM CRAP authentication for user [%s]\\[%s] returned %s (PAM: %d)\n",
 344                domain,
 345                user,
 346                state->response.data.auth.nt_status_string,
 347                state->response.data.auth.pam_error));
 348
 349         if (mem_ctx)
 350                 talloc_destroy(mem_ctx);
 351
 352         return NT_STATUS_IS_OK(result) ? WINBINDD_OK : WINBINDD_ERROR;
 353 }
 354
 355 /* Change a user password */
 356
 357 enum winbindd_result winbindd_pam_chauthtok(struct winbindd_cli_state *state)
 358 {
 359         NTSTATUS result;
 360         char *oldpass, *newpass;
 361         fstring domain, user;
 362         CLI_POLICY_HND *hnd;
 363
 364         DEBUG(3, ("[%5d]: pam chauthtok %s\n", state->pid,
 365                 state->request.data.chauthtok.user));
 366
 367         /* Setup crap */
 368
 369         if (state == NULL)
 370                 return WINBINDD_ERROR;
 371
 372         if (!parse_domain_user(state->request.data.chauthtok.user, domain,
 373                                user)) {
 374                 result = NT_STATUS_INVALID_PARAMETER;
 375                 goto done;
 376         }
 377
 378         /* Change password */
 379
 380         oldpass = state->request.data.chauthtok.oldpass;
 381         newpass = state->request.data.chauthtok.newpass;
 382
 383         /* Get sam handle */
 384
 385         if (!(hnd = cm_get_sam_handle(domain))) {
 386                 DEBUG(1, ("could not get SAM handle on DC for %s\n", domain));
 387                 result = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 388                 goto done;
 389         }
 390
 391         if (!cli_oem_change_password(hnd->cli, user, newpass, oldpass)) {
 392                 DEBUG(1, ("password change failed for user %s/%s\n", domain,
 393                           user));
 394                 result = NT_STATUS_WRONG_PASSWORD;
 395         } else {
 396                 result = NT_STATUS_OK;
 397         }
 398
 399 done:
 400         state->response.data.auth.nt_status = NT_STATUS_V(result);
 401         fstrcpy(state->response.data.auth.nt_status_string, nt_errstr(result));
 402         fstrcpy(state->response.data.auth.error_string, nt_errstr(result));
 403         state->response.data.auth.pam_error = nt_status_to_pam(result);
 404
 405         DEBUG(NT_STATUS_IS_OK(result) ? 5 : 2,
 406               ("Password change for user [%s]\\[%s] returned %s (PAM: %d)\n",
 407                domain,
 408                user,
 409                state->response.data.auth.nt_status_string,
 410                state->response.data.auth.pam_error));
 411
 412         return NT_STATUS_IS_OK(result) ? WINBINDD_OK : WINBINDD_ERROR;
 413 }