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 = memdup(prs_data_p(&ps), size);
  46         if (!state->response.extra_data) {
  47                 prs_mem_free(&ps);
  48                 return NT_STATUS_NO_MEMORY;
  49         }
  50         state->response.length += size;
  51         prs_mem_free(&ps);
  52         return NT_STATUS_OK;
  53 }
  54
  55 /* Return a password structure from a username.  */
  56
  57 enum winbindd_result winbindd_pam_auth(struct winbindd_cli_state *state)
  58 {
  59         NTSTATUS result;
  60         fstring name_domain, name_user;
  61         unsigned char trust_passwd[16];
  62         time_t last_change_time;
  63         uint32 smb_uid_low;
  64         NET_USER_INFO_3 info3;
  65         struct cli_state *cli = NULL;
  66         uchar chal[8];
  67         TALLOC_CTX *mem_ctx = NULL;
  68         DATA_BLOB lm_resp;
  69         DATA_BLOB nt_resp;
  70
  71         /* Ensure null termination */
  72         state->request.data.auth.user[sizeof(state->request.data.auth.user)-1]='\0';
  73
  74         /* Ensure null termination */
  75         state->request.data.auth.pass[sizeof(state->request.data.auth.pass)-1]='\0';
  76
  77         DEBUG(3, ("[%5d]: pam auth %s\n", state->pid,
  78                   state->request.data.auth.user));
  79
  80         if (!(mem_ctx = talloc_init_named("winbind pam auth for %s", state->request.data.auth.user))) {
  81                 DEBUG(0, ("winbindd_pam_auth: could not talloc_init()!\n"));
  82                 result = NT_STATUS_NO_MEMORY;
  83                 goto done;
  84         }
  85
  86         /* Parse domain and username */
  87
  88         if (!parse_domain_user(state->request.data.auth.user, name_domain,
  89                                name_user)) {
  90                 DEBUG(5,("no domain separator (%s) in username (%s) - failing auth\n", lp_winbind_separator(), state->request.data.auth.user));
  91                 result = NT_STATUS_INVALID_PARAMETER;
  92                 goto done;
  93         }
  94
  95         {
  96                 unsigned char local_lm_response[24];
  97                 unsigned char local_nt_response[24];
  98
  99                 generate_random_buffer(chal, 8, False);
 100                 SMBencrypt(state->request.data.auth.pass, chal, local_lm_response);
 101
 102                 SMBNTencrypt(state->request.data.auth.pass, chal, local_nt_response);
 103
 104                 lm_resp = data_blob_talloc(mem_ctx, local_lm_response, sizeof(local_lm_response));
 105                 nt_resp = data_blob_talloc(mem_ctx, local_nt_response, sizeof(local_nt_response));
 106         }
 107
 108         /*
 109          * Get the machine account password for our primary domain
 110          */
 111
 112         if (!secrets_fetch_trust_account_password(
 113                 lp_workgroup(), trust_passwd, &last_change_time)) {
 114                 DEBUG(0, ("winbindd_pam_auth: could not fetch trust account "
 115                           "password for domain %s\n", lp_workgroup()));
 116                 result = NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 117                 goto done;
 118         }
 119
 120         /* We really don't care what LUID we give the user. */
 121
 122         generate_random_buffer( (unsigned char *)&smb_uid_low, 4, False);
 123
 124         ZERO_STRUCT(info3);
 125
 126         /* Don't shut this down - it belongs to the connection cache code */
 127         result = cm_get_netlogon_cli(lp_workgroup(), trust_passwd, &cli);
 128
 129         if (!NT_STATUS_IS_OK(result)) {
 130                 DEBUG(3, ("could not open handle to NETLOGON pipe\n"));
 131                 goto done;
 132         }
 133
 134         result = cli_netlogon_sam_network_logon(cli, mem_ctx,
 135                                                 name_user, name_domain,
 136                                                 global_myname(), chal,
 137                                                 lm_resp, nt_resp,
 138                                                 &info3);
 139
 140         uni_group_cache_store_netlogon(mem_ctx, &info3);
 141 done:
 142
 143         state->response.data.auth.nt_status = NT_STATUS_V(result);
 144         fstrcpy(state->response.data.auth.nt_status_string, nt_errstr(result));
 145         fstrcpy(state->response.data.auth.error_string, nt_errstr(result));
 146         state->response.data.auth.pam_error = nt_status_to_pam(result);
 147
 148         DEBUG(NT_STATUS_IS_OK(result) ? 5 : 2, ("Plain-text authentication for user %s returned %s (PAM: %d)\n",
 149               state->request.data.auth.user,
 150               state->response.data.auth.nt_status_string,
 151               state->response.data.auth.pam_error));
 152
 153         if (mem_ctx)
 154                 talloc_destroy(mem_ctx);
 155
 156         return NT_STATUS_IS_OK(result) ? WINBINDD_OK : WINBINDD_ERROR;
 157 }
 158
 159 /* Challenge Response Authentication Protocol */
 160
 161 enum winbindd_result winbindd_pam_auth_crap(struct winbindd_cli_state *state)
 162 {
 163         NTSTATUS result;
 164         unsigned char trust_passwd[16];
 165         time_t last_change_time;
 166         NET_USER_INFO_3 info3;
 167         struct cli_state *cli = NULL;
 168         TALLOC_CTX *mem_ctx = NULL;
 169         char *user = NULL;
 170         const char *domain = NULL;
 171         const char *contact_domain;
 172         const char *workstation;
 173
 174         DATA_BLOB lm_resp, nt_resp;
 175
 176         /* Ensure null termination */
 177         state->request.data.auth_crap.user[sizeof(state->request.data.auth_crap.user)-1]='\0';
 178
 179         /* Ensure null termination */
 180         state->request.data.auth_crap.domain[sizeof(state->request.data.auth_crap.domain)-1]='\0';
 181
 182         if (!(mem_ctx = talloc_init_named("winbind pam auth crap for (utf8) %s", state->request.data.auth_crap.user))) {
 183                 DEBUG(0, ("winbindd_pam_auth_crap: could not talloc_init()!\n"));
 184                 result = NT_STATUS_NO_MEMORY;
 185                 goto done;
 186         }
 187
 188         if (pull_utf8_talloc(mem_ctx, &user, state->request.data.auth_crap.user) < 0) {
 189                 DEBUG(0, ("winbindd_pam_auth_crap: pull_utf8_talloc failed!\n"));
 190         }
 191
 192         if (*state->request.data.auth_crap.domain) {
 193                 char *dom = NULL;
 194                 if (pull_utf8_talloc(mem_ctx, &dom, state->request.data.auth_crap.domain) < 0) {
 195                         DEBUG(0, ("winbindd_pam_auth_crap: pull_utf8_talloc failed!\n"));
 196                 }
 197                 domain = dom;
 198         } else if (lp_winbind_use_default_domain()) {
 199                 domain = lp_workgroup();
 200         } else {
 201                 DEBUG(5,("no domain specified with username (%s) - failing auth\n",
 202                          user));
 203                 result = NT_STATUS_INVALID_PARAMETER;
 204                 goto done;
 205         }
 206
 207         DEBUG(3, ("[%5d]: pam auth crap domain: %s user: %s\n", state->pid,
 208                   domain, user));
 209
 210         if (lp_allow_trusted_domains() && (state->request.data.auth_crap.flags & WINBIND_PAM_CONTACT_TRUSTDOM)) {
 211                 contact_domain = domain;
 212         } else {
 213                 contact_domain = lp_workgroup();
 214         }
 215
 216         if (*state->request.data.auth_crap.workstation) {
 217                 char *wrk = NULL;
 218                 if (pull_utf8_talloc(mem_ctx, &wrk, state->request.data.auth_crap.workstation) < 0) {
 219                         DEBUG(0, ("winbindd_pam_auth_crap: pull_utf8_talloc failed!\n"));
 220                 }
 221                 workstation = wrk;
 222         } else {
 223                 workstation = global_myname();
 224         }
 225
 226         if (state->request.data.auth_crap.lm_resp_len > sizeof(state->request.data.auth_crap.lm_resp)
 227                 || state->request.data.auth_crap.nt_resp_len > sizeof(state->request.data.auth_crap.nt_resp)) {
 228                 DEBUG(0, ("winbindd_pam_auth_crap: invalid password length %u/%u\n",
 229                           state->request.data.auth_crap.lm_resp_len,
 230                           state->request.data.auth_crap.nt_resp_len));
 231                 result = NT_STATUS_INVALID_PARAMETER;
 232                 goto done;
 233         }
 234
 235         lm_resp = data_blob_talloc(mem_ctx, state->request.data.auth_crap.lm_resp, state->request.data.auth_crap.lm_resp_len);
 236         nt_resp = data_blob_talloc(mem_ctx, state->request.data.auth_crap.nt_resp, state->request.data.auth_crap.nt_resp_len);
 237
 238         /*
 239          * Get the machine account password for the domain to contact.
 240          * This is either our own domain for a workstation, or possibly
 241          * any domain for a PDC with trusted domains.
 242          */
 243
 244         if (!secrets_fetch_trust_account_password (
 245                 contact_domain, trust_passwd, &last_change_time)) {
 246                 DEBUG(0, ("winbindd_pam_auth: could not fetch trust account "
 247                           "password for domain %s\n", contact_domain));
 248                 result = NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 249                 goto done;
 250         }
 251
 252         ZERO_STRUCT(info3);
 253
 254         /* Don't shut this down - it belongs to the connection cache code */
 255         result = cm_get_netlogon_cli(contact_domain, trust_passwd, &cli);
 256
 257         if (!NT_STATUS_IS_OK(result)) {
 258                 DEBUG(3, ("could not open handle to NETLOGON pipe (error: %s)\n", nt_errstr(result)));
 259                 goto done;
 260         }
 261
 262         result = cli_netlogon_sam_network_logon(cli, mem_ctx,
 263                                                 user, domain,
 264                                                 workstation, state->request.data.auth_crap.chal,
 265                                                 lm_resp, nt_resp,
 266                                                 &info3);
 267
 268         if (NT_STATUS_IS_OK(result)) {
 269                 uni_group_cache_store_netlogon(mem_ctx, &info3);
 270                 if (state->request.data.auth_crap.flags & WINBIND_PAM_INFO3_NDR) {
 271                         result = append_info3_as_ndr(mem_ctx, state, &info3);
 272                 }
 273
 274 #if 0
 275                 /* we don't currently do this stuff right */
 276                 if (state->request.data.auth_crap.flags & WINBIND_PAM_NTKEY) {
 277                         SMB_ASSERT(sizeof(state->response.data.auth.nt_session_key) == sizeof(info3.user_sess_key));
 278                         memcpy(state->response.data.auth.nt_session_key, info3.user_sess_key, sizeof(state->response.data.auth.nt_session_key) /* 16 */);
 279                 }
 280                 if (state->request.data.auth_crap.flags & WINBIND_PAM_LMKEY) {
 281                         SMB_ASSERT(sizeof(state->response.data.auth.nt_session_key) <= sizeof(info3.user_sess_key));
 282                         memcpy(state->response.data.auth.first_8_lm_hash, info3.padding, sizeof(state->response.data.auth.nt_session_key) /* 16 */);
 283                 }
 284 #endif
 285         }
 286
 287 done:
 288
 289         state->response.data.auth.nt_status = NT_STATUS_V(result);
 290         push_utf8_fstring(state->response.data.auth.nt_status_string, nt_errstr(result));
 291         push_utf8_fstring(state->response.data.auth.error_string, nt_errstr(result));
 292         state->response.data.auth.pam_error = nt_status_to_pam(result);
 293
 294         DEBUG(NT_STATUS_IS_OK(result) ? 5 : 2,
 295               ("NTLM CRAP authentication for user [%s]\\[%s] returned %s (PAM: %d)\n",
 296                domain,
 297                user,
 298                state->response.data.auth.nt_status_string,
 299                state->response.data.auth.pam_error));
 300
 301         if (mem_ctx)
 302                 talloc_destroy(mem_ctx);
 303
 304         return NT_STATUS_IS_OK(result) ? WINBINDD_OK : WINBINDD_ERROR;
 305 }
 306
 307 /* Change a user password */
 308
 309 enum winbindd_result winbindd_pam_chauthtok(struct winbindd_cli_state *state)
 310 {
 311         NTSTATUS result;
 312         char *oldpass, *newpass;
 313         fstring domain, user;
 314         CLI_POLICY_HND *hnd;
 315
 316         DEBUG(3, ("[%5d]: pam chauthtok %s\n", state->pid,
 317                 state->request.data.chauthtok.user));
 318
 319         /* Setup crap */
 320
 321         if (state == NULL)
 322                 return WINBINDD_ERROR;
 323
 324         if (!parse_domain_user(state->request.data.chauthtok.user, domain,
 325                                user)) {
 326                 result = NT_STATUS_INVALID_PARAMETER;
 327                 goto done;
 328         }
 329
 330         /* Change password */
 331
 332         oldpass = state->request.data.chauthtok.oldpass;
 333         newpass = state->request.data.chauthtok.newpass;
 334
 335         /* Get sam handle */
 336
 337         if (!(hnd = cm_get_sam_handle(domain))) {
 338                 DEBUG(1, ("could not get SAM handle on DC for %s\n", domain));
 339                 result = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 340                 goto done;
 341         }
 342
 343         if (!cli_oem_change_password(hnd->cli, user, newpass, oldpass)) {
 344                 DEBUG(1, ("password change failed for user %s/%s\n", domain,
 345                           user));
 346                 result = NT_STATUS_WRONG_PASSWORD;
 347         } else {
 348                 result = NT_STATUS_OK;
 349         }
 350
 351 done:
 352         state->response.data.auth.nt_status = NT_STATUS_V(result);
 353         fstrcpy(state->response.data.auth.nt_status_string, nt_errstr(result));
 354         fstrcpy(state->response.data.auth.error_string, nt_errstr(result));
 355         state->response.data.auth.pam_error = nt_status_to_pam(result);
 356
 357         DEBUG(NT_STATUS_IS_OK(result) ? 5 : 2,
 358               ("Password change for user [%s]\\[%s] returned %s (PAM: %d)\n",
 359                domain,
 360                user,
 361                state->response.data.auth.nt_status_string,
 362                state->response.data.auth.pam_error));
 363
 364         return NT_STATUS_IS_OK(result) ? WINBINDD_OK : WINBINDD_ERROR;
 365 }