source4/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 smb_uid_low;
  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
  72         /* Ensure null termination */
  73         state->request.data.auth.user[sizeof(state->request.data.auth.user)-1]='\0';
  74
  75         /* Ensure null termination */
  76         state->request.data.auth.pass[sizeof(state->request.data.auth.pass)-1]='\0';
  77
  78         DEBUG(3, ("[%5d]: pam auth %s\n", state->pid,
  79                   state->request.data.auth.user));
  80
  81         if (!(mem_ctx = talloc_init("winbind pam auth for %s", state->request.data.auth.user))) {
  82                 DEBUG(0, ("winbindd_pam_auth: could not talloc_init()!\n"));
  83                 result = NT_STATUS_NO_MEMORY;
  84                 goto done;
  85         }
  86
  87         /* Parse domain and username */
  88
  89         if (!parse_domain_user(state->request.data.auth.user, name_domain,
  90                                name_user)) {
  91                 DEBUG(5,("no domain separator (%s) in username (%s) - failing auth\n", lp_winbind_separator(), state->request.data.auth.user));
  92                 result = NT_STATUS_INVALID_PARAMETER;
  93                 goto done;
  94         }
  95
  96         {
  97                 unsigned char local_lm_response[24];
  98                 unsigned char local_nt_response[24];
  99
 100                 generate_random_buffer(chal, 8, False);
 101                 SMBencrypt(state->request.data.auth.pass, chal, local_lm_response);
 102
 103                 SMBNTencrypt(state->request.data.auth.pass, chal, local_nt_response);
 104
 105                 lm_resp = data_blob_talloc(mem_ctx, local_lm_response, sizeof(local_lm_response));
 106                 nt_resp = data_blob_talloc(mem_ctx, local_nt_response, sizeof(local_nt_response));
 107         }
 108
 109         /*
 110          * Get the machine account password for our primary domain
 111          */
 112
 113         if (!secrets_fetch_trust_account_password(
 114                 lp_workgroup(), trust_passwd, &last_change_time)) {
 115                 DEBUG(0, ("winbindd_pam_auth: could not fetch trust account "
 116                           "password for domain %s\n", lp_workgroup()));
 117                 result = NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 118                 goto done;
 119         }
 120
 121         /* We really don't care what LUID we give the user. */
 122
 123         generate_random_buffer( (unsigned char *)&smb_uid_low, 4, False);
 124
 125         ZERO_STRUCT(info3);
 126
 127         /* Don't shut this down - it belongs to the connection cache code */
 128         result = cm_get_netlogon_cli(lp_workgroup(), trust_passwd, &cli);
 129
 130         if (!NT_STATUS_IS_OK(result)) {
 131                 DEBUG(3, ("could not open handle to NETLOGON pipe\n"));
 132                 goto done;
 133         }
 134
 135         result = cli_netlogon_sam_network_logon(cli, mem_ctx,
 136                                                 name_user, name_domain,
 137                                                 lp_netbios_name(), chal,
 138                                                 lm_resp, nt_resp,
 139                                                 &info3);
 140
 141         uni_group_cache_store_netlogon(mem_ctx, &info3);
 142 done:
 143
 144         state->response.data.auth.nt_status = NT_STATUS_V(result);
 145         fstrcpy(state->response.data.auth.nt_status_string, nt_errstr(result));
 146         fstrcpy(state->response.data.auth.error_string, get_friendly_nt_error_msg(result));
 147         state->response.data.auth.pam_error = nt_status_to_pam(result);
 148
 149         DEBUG(NT_STATUS_IS_OK(result) ? 5 : 2, ("Plain-text authentication for user %s returned %s (PAM: %d)\n",
 150               state->request.data.auth.user,
 151               state->response.data.auth.nt_status_string,
 152               state->response.data.auth.pam_error));
 153
 154         if (mem_ctx)
 155                 talloc_destroy(mem_ctx);
 156
 157         return NT_STATUS_IS_OK(result) ? WINBINDD_OK : WINBINDD_ERROR;
 158 }
 159
 160 /* Challenge Response Authentication Protocol */
 161
 162 enum winbindd_result winbindd_pam_auth_crap(struct winbindd_cli_state *state)
 163 {
 164         NTSTATUS result;
 165         unsigned char trust_passwd[16];
 166         time_t last_change_time;
 167         NET_USER_INFO_3 info3;
 168         struct cli_state *cli = NULL;
 169         TALLOC_CTX *mem_ctx = NULL;
 170         char *user = NULL;
 171         const char *domain = NULL;
 172         const char *contact_domain;
 173         const char *workstation;
 174
 175         DATA_BLOB lm_resp, nt_resp;
 176
 177         /* Ensure null termination */
 178         state->request.data.auth_crap.user[sizeof(state->request.data.auth_crap.user)-1]='\0';
 179
 180         /* Ensure null termination */
 181         state->request.data.auth_crap.domain[sizeof(state->request.data.auth_crap.domain)-1]='\0';
 182
 183         if (!(mem_ctx = talloc_init("winbind pam auth crap for (utf8) %s", state->request.data.auth_crap.user))) {
 184                 DEBUG(0, ("winbindd_pam_auth_crap: could not talloc_init()!\n"));
 185                 result = NT_STATUS_NO_MEMORY;
 186                 goto done;
 187         }
 188
 189         if (pull_utf8_talloc(mem_ctx, &user, state->request.data.auth_crap.user) == (size_t)-1) {
 190                 DEBUG(0, ("winbindd_pam_auth_crap: pull_utf8_talloc failed!\n"));
 191         }
 192
 193         if (*state->request.data.auth_crap.domain) {
 194                 char *dom = NULL;
 195                 if (pull_utf8_talloc(mem_ctx, &dom, state->request.data.auth_crap.domain) == (size_t)-1) {
 196                         DEBUG(0, ("winbindd_pam_auth_crap: pull_utf8_talloc failed!\n"));
 197                 }
 198                 domain = dom;
 199         } else if (lp_winbind_use_default_domain()) {
 200                 domain = lp_workgroup();
 201         } else {
 202                 DEBUG(5,("no domain specified with username (%s) - failing auth\n",
 203                          user));
 204                 result = NT_STATUS_INVALID_PARAMETER;
 205                 goto done;
 206         }
 207
 208         DEBUG(3, ("[%5d]: pam auth crap domain: %s user: %s\n", state->pid,
 209                   domain, user));
 210
 211         if (lp_allow_trusted_domains() && (state->request.data.auth_crap.flags & WINBIND_PAM_CONTACT_TRUSTDOM)) {
 212                 contact_domain = domain;
 213         } else {
 214                 contact_domain = lp_workgroup();
 215         }
 216
 217         if (*state->request.data.auth_crap.workstation) {
 218                 char *wrk = NULL;
 219                 if (pull_utf8_talloc(mem_ctx, &wrk, state->request.data.auth_crap.workstation) == (size_t)-1) {
 220                         DEBUG(0, ("winbindd_pam_auth_crap: pull_utf8_talloc failed!\n"));
 221                 }
 222                 workstation = wrk;
 223         } else {
 224                 workstation = lp_netbios_name();
 225         }
 226
 227         if (state->request.data.auth_crap.lm_resp_len > sizeof(state->request.data.auth_crap.lm_resp)
 228                 || state->request.data.auth_crap.nt_resp_len > sizeof(state->request.data.auth_crap.nt_resp)) {
 229                 DEBUG(0, ("winbindd_pam_auth_crap: invalid password length %u/%u\n",
 230                           state->request.data.auth_crap.lm_resp_len,
 231                           state->request.data.auth_crap.nt_resp_len));
 232                 result = NT_STATUS_INVALID_PARAMETER;
 233                 goto done;
 234         }
 235
 236         lm_resp = data_blob_talloc(mem_ctx, state->request.data.auth_crap.lm_resp, state->request.data.auth_crap.lm_resp_len);
 237         nt_resp = data_blob_talloc(mem_ctx, state->request.data.auth_crap.nt_resp, state->request.data.auth_crap.nt_resp_len);
 238
 239         /*
 240          * Get the machine account password for the domain to contact.
 241          * This is either our own domain for a workstation, or possibly
 242          * any domain for a PDC with trusted domains.
 243          */
 244
 245         if (!secrets_fetch_trust_account_password (
 246                 contact_domain, trust_passwd, &last_change_time)) {
 247                 DEBUG(0, ("winbindd_pam_auth: could not fetch trust account "
 248                           "password for domain %s\n", contact_domain));
 249                 result = NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 250                 goto done;
 251         }
 252
 253         ZERO_STRUCT(info3);
 254
 255         /* Don't shut this down - it belongs to the connection cache code */
 256         result = cm_get_netlogon_cli(contact_domain, trust_passwd, &cli);
 257
 258         if (!NT_STATUS_IS_OK(result)) {
 259                 DEBUG(3, ("could not open handle to NETLOGON pipe (error: %s)\n", nt_errstr(result)));
 260                 goto done;
 261         }
 262
 263         result = cli_netlogon_sam_network_logon(cli, mem_ctx,
 264                                                 user, domain,
 265                                                 workstation, state->request.data.auth_crap.chal,
 266                                                 lm_resp, nt_resp,
 267                                                 &info3);
 268
 269         if (NT_STATUS_IS_OK(result)) {
 270                 uni_group_cache_store_netlogon(mem_ctx, &info3);
 271                 if (state->request.data.auth_crap.flags & WINBIND_PAM_INFO3_NDR) {
 272                         result = append_info3_as_ndr(mem_ctx, state, &info3);
 273                 }
 274
 275 #if 0
 276                 /* we don't currently do this stuff right */
 277                 /* Doing an assert in a daemon is going to be a pretty bad
 278                    idea. - tpot */
 279                 if (state->request.data.auth_crap.flags & WINBIND_PAM_NTKEY) {
 280                         SMB_ASSERT(sizeof(state->response.data.auth.nt_session_key) == sizeof(info3.user_sess_key));
 281                         memcpy(state->response.data.auth.nt_session_key, info3.user_sess_key, sizeof(state->response.data.auth.nt_session_key) /* 16 */);
 282                 }
 283                 if (state->request.data.auth_crap.flags & WINBIND_PAM_LMKEY) {
 284                         SMB_ASSERT(sizeof(state->response.data.auth.nt_session_key) <= sizeof(info3.user_sess_key));
 285                         memcpy(state->response.data.auth.first_8_lm_hash, info3.padding, sizeof(state->response.data.auth.nt_session_key) /* 16 */);
 286                 }
 287 #endif
 288         }
 289
 290 done:
 291
 292         state->response.data.auth.nt_status = NT_STATUS_V(result);
 293         push_utf8_fstring(state->response.data.auth.nt_status_string, nt_errstr(result));
 294         push_utf8_fstring(state->response.data.auth.error_string, nt_errstr(result));
 295         state->response.data.auth.pam_error = nt_status_to_pam(result);
 296
 297         DEBUG(NT_STATUS_IS_OK(result) ? 5 : 2,
 298               ("NTLM CRAP authentication for user [%s]\\[%s] returned %s (PAM: %d)\n",
 299                domain,
 300                user,
 301                state->response.data.auth.nt_status_string,
 302                state->response.data.auth.pam_error));
 303
 304         if (mem_ctx)
 305                 talloc_destroy(mem_ctx);
 306
 307         return NT_STATUS_IS_OK(result) ? WINBINDD_OK : WINBINDD_ERROR;
 308 }
 309
 310 /* Change a user password */
 311
 312 enum winbindd_result winbindd_pam_chauthtok(struct winbindd_cli_state *state)
 313 {
 314         NTSTATUS result;
 315         char *oldpass, *newpass;
 316         fstring domain, user;
 317         CLI_POLICY_HND *hnd;
 318
 319         DEBUG(3, ("[%5d]: pam chauthtok %s\n", state->pid,
 320                 state->request.data.chauthtok.user));
 321
 322         /* Setup crap */
 323
 324         if (state == NULL)
 325                 return WINBINDD_ERROR;
 326
 327         if (!parse_domain_user(state->request.data.chauthtok.user, domain,
 328                                user)) {
 329                 result = NT_STATUS_INVALID_PARAMETER;
 330                 goto done;
 331         }
 332
 333         /* Change password */
 334
 335         oldpass = state->request.data.chauthtok.oldpass;
 336         newpass = state->request.data.chauthtok.newpass;
 337
 338         /* Get sam handle */
 339
 340         if (!(hnd = cm_get_sam_handle(domain))) {
 341                 DEBUG(1, ("could not get SAM handle on DC for %s\n", domain));
 342                 result = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 343                 goto done;
 344         }
 345
 346         if (!cli_oem_change_password(hnd->cli, user, newpass, oldpass)) {
 347                 DEBUG(1, ("password change failed for user %s/%s\n", domain,
 348                           user));
 349                 result = NT_STATUS_WRONG_PASSWORD;
 350         } else {
 351                 result = NT_STATUS_OK;
 352         }
 353
 354 done:
 355         state->response.data.auth.nt_status = NT_STATUS_V(result);
 356         fstrcpy(state->response.data.auth.nt_status_string, nt_errstr(result));
 357         fstrcpy(state->response.data.auth.error_string, nt_errstr(result));
 358         state->response.data.auth.pam_error = nt_status_to_pam(result);
 359
 360         DEBUG(NT_STATUS_IS_OK(result) ? 5 : 2,
 361               ("Password change for user [%s]\\[%s] returned %s (PAM: %d)\n",
 362                domain,
 363                user,
 364                state->response.data.auth.nt_status_string,
 365                state->response.data.auth.pam_error));
 366
 367         return NT_STATUS_IS_OK(result) ? WINBINDD_OK : WINBINDD_ERROR;
 368 }