source/nsswitch/pam_winbind.c

   1 /* pam_winbind module
   2
   3    Copyright Andrew Tridgell <tridge@samba.org> 2000
   4    Copyright Tim Potter <tpot@samba.org> 2000
   5    Copyright Andrew Bartlett <abartlet@samba.org> 2002
   6    Copyright Guenther Deschner <gd@samba.org> 2005-2006
   7
   8    largely based on pam_userdb by Cristian Gafton <gafton@redhat.com>
   9    also contains large slabs of code from pam_unix by Elliot Lee <sopwith@redhat.com>
  10    (see copyright below for full details)
  11 */
  12
  13 #include "includes.h"
  14 #include "pam_winbind.h"
  15
  16 /* data tokens */
  17
  18 #define MAX_PASSWD_TRIES        3
  19
  20 /* some syslogging */
  21 static void _pam_log(int err, const char *format, ...)
  22 {
  23         va_list args;
  24
  25         va_start(args, format);
  26         openlog(MODULE_NAME, LOG_CONS|LOG_PID, LOG_AUTH);
  27         vsyslog(err, format, args);
  28         va_end(args);
  29         closelog();
  30 }
  31
  32 static void _pam_log_debug(int ctrl, int err, const char *format, ...)
  33 {
  34         va_list args;
  35
  36         if (!(ctrl & WINBIND_DEBUG_ARG)) {
  37                 return;
  38         }
  39
  40         va_start(args, format);
  41         openlog(MODULE_NAME, LOG_CONS|LOG_PID, LOG_AUTH);
  42         vsyslog(err, format, args);
  43         va_end(args);
  44         closelog();
  45 }
  46
  47 static int _pam_parse(int argc, const char **argv)
  48 {
  49         int ctrl = 0;
  50
  51         load_case_tables();
  52
  53         if (!lp_load(dyn_CONFIGFILE,True,False,False,True)) {
  54                 return -1;
  55         }
  56
  57         if (lp_parm_bool(-1, "pam_winbind", "cached_login", False)) {
  58                 ctrl |= WINBIND_CACHED_LOGIN;
  59         }
  60         if (lp_parm_bool(-1, "pam_winbind", "krb5_auth", False)) {
  61                 ctrl |= WINBIND_KRB5_AUTH;
  62         }
  63         if (lp_parm_const_string(-1, "pam_winbind", "krb5_ccache_type", NULL) != NULL) {
  64                 ctrl |= WINBIND_KRB5_CCACHE_TYPE;
  65         }
  66         if ((lp_parm_const_string(-1, "pam_winbind", "require-membership-of", NULL) != NULL) ||
  67             (lp_parm_const_string(-1, "pam_winbind", "require_membership_of", NULL) != NULL)) {
  68                 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
  69         }
  70         if (lp_parm_bool(-1, "pam_winbind", "create_homedir", False)) {
  71                 ctrl |= WINBIND_CREATE_HOMEDIR;
  72         }
  73
  74         /* step through arguments */
  75         for (; argc-- > 0; ++argv) {
  76
  77                 /* generic options */
  78
  79                 if (!StrCaseCmp(*argv, "debug"))
  80                         ctrl |= WINBIND_DEBUG_ARG;
  81                 else if (strequal(*argv, "use_authtok"))
  82                         ctrl |= WINBIND_USE_AUTHTOK_ARG;
  83                 else if (strequal(*argv, "use_first_pass"))
  84                         ctrl |= WINBIND_USE_FIRST_PASS_ARG;
  85                 else if (strequal(*argv, "try_first_pass"))
  86                         ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
  87                 else if (strequal(*argv, "unknown_ok"))
  88                         ctrl |= WINBIND_UNKNOWN_OK_ARG;
  89                 else if (strnequal(*argv, "require_membership_of", strlen("require_membership_of")))
  90                         ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
  91                 else if (strnequal(*argv, "require-membership-of", strlen("require-membership-of")))
  92                         ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
  93                 else if (strequal(*argv, "krb5_auth"))
  94                         ctrl |= WINBIND_KRB5_AUTH;
  95                 else if (strnequal(*argv, "krb5_ccache_type", strlen("krb5_ccache_type")))
  96                         ctrl |= WINBIND_KRB5_CCACHE_TYPE;
  97                 else if (strequal(*argv, "cached_login"))
  98                         ctrl |= WINBIND_CACHED_LOGIN;
  99                 else if (strequal(*argv, "create_homedir"))
 100                         ctrl |= WINBIND_CREATE_HOMEDIR;
 101                 else {
 102                         _pam_log(LOG_ERR, "pam_parse: unknown option; %s", *argv);
 103                 }
 104
 105         }
 106         return ctrl;
 107 };
 108
 109 static void _pam_winbind_cleanup_func(pam_handle_t *pamh, void *data, int error_status)
 110 {
 111         SAFE_FREE(data);
 112 }
 113
 114 static const struct ntstatus_errors {
 115         const char *ntstatus_string;
 116         const char *error_string;
 117 } ntstatus_errors[] = {
 118         {"NT_STATUS_OK", "Success"},
 119         {"NT_STATUS_BACKUP_CONTROLLER", "No primary Domain Controler available"},
 120         {"NT_STATUS_PWD_TOO_SHORT", "Password too short"},
 121         {"NT_STATUS_PWD_TOO_RECENT", "The password of this user is too recent to change"},
 122         {"NT_STATUS_PWD_HISTORY_CONFLICT", "Password is already in password history"},
 123         {"NT_STATUS_PASSWORD_EXPIRED", "Your password has expired"},
 124         {"NT_STATUS_PASSWORD_MUST_CHANGE", "You need to change your password now"},
 125         {"NT_STATUS_INVALID_WORKSTATION", "You are not allowed to logon from this workstation"},
 126         {"NT_STATUS_INVALID_LOGON_HOURS", "You are not allowed to logon at this time"},
 127         {"NT_STATUS_ACCOUNT_EXPIRED", "Your account has expired. Please contact your System administrator"}, /* SCNR */
 128         {"NT_STATUS_ACCOUNT_DISABLED", "Your account is disabled. Please contact your System administrator"}, /* SCNR */
 129         {"NT_STATUS_ACCOUNT_LOCKED_OUT", "Your account has been locked. Please contact your System administrator"}, /* SCNR */
 130         {"NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT", "Invalid Trust Account"},
 131         {"NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT", "Invalid Trust Account"},
 132         {"NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT", "Invalid Trust Account"},
 133         {"NT_STATUS_ACCESS_DENIED", "Access is denied"},
 134         {NULL, NULL}
 135 };
 136
 137 const char *_get_ntstatus_error_string(const char *nt_status_string)
 138 {
 139         int i;
 140         for (i=0; ntstatus_errors[i].ntstatus_string != NULL; i++) {
 141                 if (strequal(ntstatus_errors[i].ntstatus_string, nt_status_string)) {
 142                         return ntstatus_errors[i].error_string;
 143                 }
 144         }
 145         return NULL;
 146 }
 147
 148 /* --- authentication management functions --- */
 149
 150 /* Attempt a conversation */
 151
 152 static int converse(pam_handle_t *pamh, int nargs,
 153                     struct pam_message **message,
 154                     struct pam_response **response)
 155 {
 156         int retval;
 157         struct pam_conv *conv;
 158
 159         retval = pam_get_item(pamh, PAM_CONV, (const void **) &conv );
 160         if (retval == PAM_SUCCESS) {
 161                 retval = conv->conv(nargs, (const struct pam_message **)message,
 162                                     response, conv->appdata_ptr);
 163         }
 164
 165         return retval; /* propagate error status */
 166 }
 167
 168
 169 static int _make_remark(pam_handle_t * pamh, int type, const char *text)
 170 {
 171         int retval = PAM_SUCCESS;
 172
 173         struct pam_message *pmsg[1], msg[1];
 174         struct pam_response *resp;
 175
 176         pmsg[0] = &msg[0];
 177         msg[0].msg = text;
 178         msg[0].msg_style = type;
 179
 180         resp = NULL;
 181         retval = converse(pamh, 1, pmsg, &resp);
 182
 183         if (resp) {
 184                 _pam_drop_reply(resp, 1);
 185         }
 186         return retval;
 187 }
 188
 189 static int _make_remark_format(pam_handle_t * pamh, int type, const char *format, ...)
 190 {
 191         va_list args;
 192         char *var;
 193
 194         va_start(args, format);
 195         vasprintf(&var, format, args);
 196         va_end(args);
 197
 198         return _make_remark(pamh, type, var);
 199 }
 200
 201 static int pam_winbind_request(pam_handle_t * pamh, int ctrl,
 202                                enum winbindd_cmd req_type,
 203                                struct winbindd_request *request,
 204                                struct winbindd_response *response)
 205 {
 206         /* Fill in request and send down pipe */
 207         init_request(request, req_type);
 208
 209         if (write_sock(request, sizeof(*request), 0) == -1) {
 210                 _pam_log(LOG_ERR, "write to socket failed!");
 211                 close_sock();
 212                 return PAM_SERVICE_ERR;
 213         }
 214
 215         /* Wait for reply */
 216         if (read_reply(response) == -1) {
 217                 _pam_log(LOG_ERR, "read from socket failed!");
 218                 close_sock();
 219                 return PAM_SERVICE_ERR;
 220         }
 221
 222         /* We are done with the socket - close it and avoid mischeif */
 223         close_sock();
 224
 225         /* Copy reply data from socket */
 226         if (response->result != WINBINDD_OK) {
 227                 if (response->data.auth.pam_error != PAM_SUCCESS) {
 228                         _pam_log(LOG_ERR, "request failed: %s, PAM error was %d, NT error was %s",
 229                                  response->data.auth.error_string,
 230                                  response->data.auth.pam_error,
 231                                  response->data.auth.nt_status_string);
 232                         return response->data.auth.pam_error;
 233                 } else {
 234                         _pam_log(LOG_ERR, "request failed, but PAM error 0!");
 235                         return PAM_SERVICE_ERR;
 236                 }
 237         }
 238
 239         return PAM_SUCCESS;
 240 }
 241
 242 static int pam_winbind_request_log(pam_handle_t * pamh,
 243                                    int ctrl,
 244                                    enum winbindd_cmd req_type,
 245                                    struct winbindd_request *request,
 246                                    struct winbindd_response *response,
 247                                    const char *user)
 248 {
 249         int retval;
 250
 251         retval = pam_winbind_request(pamh, ctrl, req_type, request, response);
 252
 253         switch (retval) {
 254         case PAM_AUTH_ERR:
 255                 /* incorrect password */
 256                 _pam_log(LOG_WARNING, "user `%s' denied access (incorrect password or invalid membership)", user);
 257                 return retval;
 258         case PAM_ACCT_EXPIRED:
 259                 /* account expired */
 260                 _pam_log(LOG_WARNING, "user `%s' account expired", user);
 261                 return retval;
 262         case PAM_AUTHTOK_EXPIRED:
 263                 /* password expired */
 264                 _pam_log(LOG_WARNING, "user `%s' password expired", user);
 265                 return retval;
 266         case PAM_NEW_AUTHTOK_REQD:
 267                 /* new password required */
 268                 _pam_log(LOG_WARNING, "user `%s' new password required", user);
 269                 return retval;
 270         case PAM_USER_UNKNOWN:
 271                 /* the user does not exist */
 272                 _pam_log_debug(ctrl, LOG_NOTICE, "user `%s' not found",
 273                                  user);
 274                 if (ctrl & WINBIND_UNKNOWN_OK_ARG) {
 275                         return PAM_IGNORE;
 276                 }
 277                 return retval;
 278         case PAM_SUCCESS:
 279                 if (req_type == WINBINDD_PAM_AUTH) {
 280                         /* Otherwise, the authentication looked good */
 281                         _pam_log(LOG_NOTICE, "user '%s' granted access", user);
 282                 } else if (req_type == WINBINDD_PAM_CHAUTHTOK) {
 283                         /* Otherwise, the authentication looked good */
 284                         _pam_log(LOG_NOTICE, "user '%s' password changed", user);
 285                 } else {
 286                         /* Otherwise, the authentication looked good */
 287                         _pam_log(LOG_NOTICE, "user '%s' OK", user);
 288                 }
 289
 290                 return retval;
 291         default:
 292                 /* we don't know anything about this return value */
 293                 _pam_log(LOG_ERR, "internal module error (retval = %d, user = `%s')",
 294                          retval, user);
 295                 return retval;
 296         }
 297 }
 298
 299 /* talk to winbindd */
 300 static int winbind_auth_request(pam_handle_t * pamh,
 301                                 int ctrl,
 302                                 const char *user,
 303                                 const char *pass,
 304                                 const char *member,
 305                                 const char *cctype,
 306                                 int process_result)
 307 {
 308         struct winbindd_request request;
 309         struct winbindd_response response;
 310         int ret;
 311
 312         ZERO_STRUCT(request);
 313         ZERO_STRUCT(response);
 314
 315         strncpy(request.data.auth.user, user,
 316                 sizeof(request.data.auth.user)-1);
 317
 318         strncpy(request.data.auth.pass, pass,
 319                 sizeof(request.data.auth.pass)-1);
 320
 321         request.data.auth.krb5_cc_type[0] = '\0';
 322         request.data.auth.uid = -1;
 323
 324         request.flags = WBFLAG_PAM_INFO3_TEXT | WBFLAG_PAM_CONTACT_TRUSTDOM;
 325
 326         if (ctrl & WINBIND_KRB5_AUTH) {
 327
 328                 struct passwd *pwd = NULL;
 329
 330                 _pam_log_debug(ctrl, LOG_DEBUG, "enabling krb5 login flag\n");
 331
 332                 request.flags |= WBFLAG_PAM_KRB5 | WBFLAG_PAM_FALLBACK_AFTER_KRB5;
 333
 334                 pwd = getpwnam(user);
 335                 if (pwd == NULL) {
 336                         return PAM_USER_UNKNOWN;
 337                 }
 338                 request.data.auth.uid = pwd->pw_uid;
 339         }
 340
 341         if (ctrl & WINBIND_CACHED_LOGIN) {
 342                 _pam_log_debug(ctrl, LOG_DEBUG, "enabling cached login flag\n");
 343                 request.flags |= WBFLAG_PAM_CACHED_LOGIN;
 344         }
 345
 346         if (cctype != NULL) {
 347                 strncpy(request.data.auth.krb5_cc_type, cctype,
 348                         sizeof(request.data.auth.krb5_cc_type) - 1);
 349                 _pam_log_debug(ctrl, LOG_DEBUG, "enabling request for a %s krb5 ccache\n", cctype);
 350         }
 351
 352         request.data.auth.require_membership_of_sid[0] = '\0';
 353
 354         if (member != NULL) {
 355                 strncpy(request.data.auth.require_membership_of_sid, member,
 356                         sizeof(request.data.auth.require_membership_of_sid)-1);
 357         }
 358
 359         /* lookup name? */
 360         if ( (member != NULL) && (strncmp("S-", member, 2) != 0) ) {
 361
 362                 struct winbindd_request sid_request;
 363                 struct winbindd_response sid_response;
 364
 365                 ZERO_STRUCT(sid_request);
 366                 ZERO_STRUCT(sid_response);
 367
 368                 _pam_log_debug(ctrl, LOG_DEBUG, "no sid given, looking up: %s\n", member);
 369
 370                 /* fortunatly winbindd can handle non-separated names */
 371                 fstrcpy(sid_request.data.name.name, member);
 372
 373                 if (pam_winbind_request_log(pamh, ctrl, WINBINDD_LOOKUPNAME, &sid_request, &sid_response, user)) {
 374                         _pam_log(LOG_INFO, "could not lookup name: %s\n", member);
 375                         return PAM_AUTH_ERR;
 376                 }
 377
 378                 member = sid_response.data.sid.sid;
 379
 380                 strncpy(request.data.auth.require_membership_of_sid, member,
 381                         sizeof(request.data.auth.require_membership_of_sid)-1);
 382         }
 383
 384         ret = pam_winbind_request_log(pamh, ctrl, WINBINDD_PAM_AUTH, &request, &response, user);
 385
 386         if ((ctrl & WINBIND_KRB5_AUTH) &&
 387             response.data.auth.krb5ccname[0] != '\0') {
 388
 389                 char var[PATH_MAX];
 390
 391                 _pam_log_debug(ctrl, LOG_DEBUG, "request returned KRB5CCNAME: %s",
 392                                response.data.auth.krb5ccname);
 393
 394                 snprintf(var, sizeof(var), "KRB5CCNAME=%s", response.data.auth.krb5ccname);
 395
 396                 ret = pam_putenv(pamh, var);
 397                 if (ret != PAM_SUCCESS) {
 398                         _pam_log(LOG_ERR, "failed to set KRB5CCNAME to %s", var);
 399                         return ret;
 400                 }
 401         }
 402
 403         if (!process_result) {
 404                 return ret;
 405         }
 406
 407         if (ret) {
 408                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_PASSWORD_EXPIRED");
 409                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_PASSWORD_MUST_CHANGE");
 410                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_INVALID_WORKSTATION");
 411                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_INVALID_LOGON_HOURS");
 412                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_ACCOUNT_EXPIRED");
 413                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_ACCOUNT_DISABLED");
 414                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_ACCOUNT_LOCKED_OUT");
 415                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT");
 416                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT");
 417                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT");
 418         }
 419
 420         /* handle the case where the auth was ok, but the password must expire right now */
 421         /* good catch from Ralf Haferkamp: an expiry of "never" is translated to -1 */
 422         if ((response.data.auth.policy.expire > 0) &&
 423             (response.data.auth.info3.pass_last_set_time + response.data.auth.policy.expire < time(NULL))) {
 424
 425                 ret = PAM_AUTHTOK_EXPIRED;
 426
 427                 _pam_log_debug(ctrl, LOG_DEBUG,"Password has expired (Password was last set: %d, "
 428                                "the policy says it should expire here %d (now it's: %d)\n",
 429                                response.data.auth.info3.pass_last_set_time,
 430                                response.data.auth.info3.pass_last_set_time + response.data.auth.policy.expire,
 431                                time(NULL));
 432
 433                 PAM_WB_REMARK_DIRECT_RET(pamh, "NT_STATUS_PASSWORD_EXPIRED");
 434
 435         }
 436
 437         /* warn a user if the password is about to expire soon */
 438         if ((response.data.auth.policy.expire) &&
 439             (response.data.auth.info3.pass_last_set_time + response.data.auth.policy.expire > time(NULL) ) ) {
 440
 441                 int days = response.data.auth.policy.expire / SECONDS_PER_DAY;
 442                 if (days <= DAYS_TO_WARN_BEFORE_PWD_EXPIRES) {
 443                         _make_remark_format(pamh, PAM_TEXT_INFO, "Your password will expire in %d days", days);
 444                 }
 445         }
 446
 447         if (response.data.auth.info3.user_flgs & LOGON_CACHED_ACCOUNT) {
 448                 _make_remark(pamh, PAM_ERROR_MSG, "Logging on using cached account. Network ressources can be unavailable");
 449         }
 450
 451         /* save the CIFS homedir for pam_cifs / pam_mount */
 452         if (response.data.auth.info3.home_dir[0] != '\0') {
 453                 char *buf;
 454
 455                 if (!asprintf(&buf, "%s", response.data.auth.info3.home_dir)) {
 456                         return PAM_BUF_ERR;
 457                 }
 458
 459                 pam_set_data( pamh, PAM_WINBIND_HOMEDIR, (void *)buf, _pam_winbind_cleanup_func);
 460         }
 461
 462         return ret;
 463 }
 464
 465 /* talk to winbindd */
 466 static int winbind_chauthtok_request(pam_handle_t * pamh,
 467                                      int ctrl,
 468                                      const char *user,
 469                                      const char *oldpass,
 470                                      const char *newpass)
 471 {
 472         struct winbindd_request request;
 473         struct winbindd_response response;
 474         int ret;
 475
 476         ZERO_STRUCT(request);
 477         ZERO_STRUCT(response);
 478
 479         if (request.data.chauthtok.user == NULL) return -2;
 480
 481         strncpy(request.data.chauthtok.user, user,
 482                 sizeof(request.data.chauthtok.user) - 1);
 483
 484         if (oldpass != NULL) {
 485                 strncpy(request.data.chauthtok.oldpass, oldpass,
 486                         sizeof(request.data.chauthtok.oldpass) - 1);
 487         } else {
 488                 request.data.chauthtok.oldpass[0] = '\0';
 489         }
 490
 491         if (newpass != NULL) {
 492                 strncpy(request.data.chauthtok.newpass, newpass,
 493                         sizeof(request.data.chauthtok.newpass) - 1);
 494         } else {
 495                 request.data.chauthtok.newpass[0] = '\0';
 496         }
 497
 498         if (ctrl & WINBIND_KRB5_AUTH) {
 499                 request.flags = WBFLAG_PAM_KRB5 | WBFLAG_PAM_CONTACT_TRUSTDOM;
 500         }
 501
 502         ret = pam_winbind_request_log(pamh, ctrl, WINBINDD_PAM_CHAUTHTOK, &request, &response, user);
 503
 504         if (ret == PAM_SUCCESS) {
 505                 return ret;
 506         }
 507
 508         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_BACKUP_CONTROLLER");
 509         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_ACCESS_DENIED");
 510
 511         /* TODO: tell the min pwd length ? */
 512         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_PWD_TOO_SHORT");
 513
 514         /* TODO: tell the minage ? */
 515         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_PWD_TOO_RECENT");
 516
 517         /* TODO: tell the history length ? */
 518         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_PWD_HISTORY_CONFLICT");
 519
 520         if (strequal(response.data.auth.nt_status_string, "NT_STATUS_PASSWORD_RESTRICTION")) {
 521
 522                 /* FIXME: avoid to send multiple PAM messages after another */
 523                 switch (response.data.auth.reject_reason) {
 524                         case 0:
 525                                 break;
 526                         case REJECT_REASON_TOO_SHORT:
 527                                 PAM_WB_REMARK_DIRECT(pamh, "NT_STATUS_PWD_TOO_SHORT");
 528                                 break;
 529                         case REJECT_REASON_IN_HISTORY:
 530                                 PAM_WB_REMARK_DIRECT(pamh, "NT_STATUS_PWD_HISTORY_CONFLICT");
 531                                 break;
 532                         case REJECT_REASON_NOT_COMPLEX:
 533                                 _make_remark(pamh, PAM_ERROR_MSG, "Password does not meet complexity requirements");
 534                                 break;
 535                         default:
 536                                 _pam_log_debug(ctrl, LOG_DEBUG,
 537                                                "unknown password change reject reason: %d",
 538                                                response.data.auth.reject_reason);
 539                                 break;
 540                 }
 541
 542                 _make_remark_format(pamh, PAM_ERROR_MSG,
 543                         "Your password must be at least %d characters; "
 544                         "cannot repeat any of the your previous %d passwords"
 545                         "%s. "
 546                         "Please type a different password. "
 547                         "Type a password which meets these requirements in both text boxes.",
 548                         response.data.auth.policy.min_length_password,
 549                         response.data.auth.policy.password_history,
 550                         (response.data.auth.policy.password_properties & DOMAIN_PASSWORD_COMPLEX) ?
 551                                 "; must contain capitals, numerals or punctuation; and cannot contain your account or full name" :
 552                                 "");
 553
 554         }
 555
 556         return ret;
 557 }
 558
 559 /*
 560  * Checks if a user has an account
 561  *
 562  * return values:
 563  *       1  = User not found
 564  *       0  = OK
 565  *      -1  = System error
 566  */
 567 static int valid_user(const char *user)
 568 {
 569         if (getpwnam(user)) return 0;
 570         return 1;
 571 }
 572
 573 static char *_pam_delete(register char *xx)
 574 {
 575         _pam_overwrite(xx);
 576         _pam_drop(xx);
 577         return NULL;
 578 }
 579
 580 /*
 581  * obtain a password from the user
 582  */
 583
 584 static int _winbind_read_password(pam_handle_t * pamh,
 585                                   unsigned int ctrl,
 586                                   const char *comment,
 587                                   const char *prompt1,
 588                                   const char *prompt2,
 589                                   const char **pass)
 590 {
 591         int authtok_flag;
 592         int retval;
 593         const char *item;
 594         char *token;
 595
 596         /*
 597          * make sure nothing inappropriate gets returned
 598          */
 599
 600         *pass = token = NULL;
 601
 602         /*
 603          * which authentication token are we getting?
 604          */
 605
 606         authtok_flag = on(WINBIND__OLD_PASSWORD, ctrl) ? PAM_OLDAUTHTOK : PAM_AUTHTOK;
 607
 608         /*
 609          * should we obtain the password from a PAM item ?
 610          */
 611
 612         if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) || on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
 613                 retval = pam_get_item(pamh, authtok_flag, (const void **) &item);
 614                 if (retval != PAM_SUCCESS) {
 615                         /* very strange. */
 616                         _pam_log(LOG_ALERT,
 617                                  "pam_get_item returned error to unix-read-password"
 618                             );
 619                         return retval;
 620                 } else if (item != NULL) {      /* we have a password! */
 621                         *pass = item;
 622                         item = NULL;
 623                         return PAM_SUCCESS;
 624                 } else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
 625                         return PAM_AUTHTOK_RECOVER_ERR;         /* didn't work */
 626                 } else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl)
 627                            && off(WINBIND__OLD_PASSWORD, ctrl)) {
 628                         return PAM_AUTHTOK_RECOVER_ERR;
 629                 }
 630         }
 631         /*
 632          * getting here implies we will have to get the password from the
 633          * user directly.
 634          */
 635
 636         {
 637                 struct pam_message msg[3], *pmsg[3];
 638                 struct pam_response *resp;
 639                 int i, replies;
 640
 641                 /* prepare to converse */
 642
 643                 if (comment != NULL) {
 644                         pmsg[0] = &msg[0];
 645                         msg[0].msg_style = PAM_TEXT_INFO;
 646                         msg[0].msg = comment;
 647                         i = 1;
 648                 } else {
 649                         i = 0;
 650                 }
 651
 652                 pmsg[i] = &msg[i];
 653                 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
 654                 msg[i++].msg = prompt1;
 655                 replies = 1;
 656
 657                 if (prompt2 != NULL) {
 658                         pmsg[i] = &msg[i];
 659                         msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
 660                         msg[i++].msg = prompt2;
 661                         ++replies;
 662                 }
 663                 /* so call the conversation expecting i responses */
 664                 resp = NULL;
 665                 retval = converse(pamh, i, pmsg, &resp);
 666
 667                 if (resp != NULL) {
 668
 669                         /* interpret the response */
 670
 671                         if (retval == PAM_SUCCESS) {    /* a good conversation */
 672
 673                                 token = SMB_STRDUP(resp[i - replies].resp);
 674                                 if (token != NULL) {
 675                                         if (replies == 2) {
 676                                                 /* verify that password entered correctly */
 677                                                 if (!resp[i - 1].resp
 678                                                     || StrCaseCmp(token, resp[i - 1].resp)) {
 679                                                         _pam_delete(token);     /* mistyped */
 680                                                         retval = PAM_AUTHTOK_RECOVER_ERR;
 681                                                         _make_remark(pamh, PAM_ERROR_MSG, MISTYPED_PASS);
 682                                                 }
 683                                         }
 684                                 } else {
 685                                         _pam_log(LOG_NOTICE
 686                                                  ,"could not recover authentication token");
 687                                 }
 688
 689                         }
 690                         /*
 691                          * tidy up the conversation (resp_retcode) is ignored
 692                          * -- what is it for anyway? AGM
 693                          */
 694
 695                         _pam_drop_reply(resp, i);
 696
 697                 } else {
 698                         retval = (retval == PAM_SUCCESS)
 699                             ? PAM_AUTHTOK_RECOVER_ERR : retval;
 700                 }
 701         }
 702
 703         if (retval != PAM_SUCCESS) {
 704                 _pam_log_debug(ctrl, LOG_DEBUG,
 705                                  "unable to obtain a password");
 706                 return retval;
 707         }
 708         /* 'token' is the entered password */
 709
 710         /* we store this password as an item */
 711
 712         retval = pam_set_item(pamh, authtok_flag, token);
 713         _pam_delete(token);     /* clean it up */
 714         if (retval != PAM_SUCCESS ||
 715             (retval = pam_get_item(pamh, authtok_flag, (const void **) &item)) != PAM_SUCCESS) {
 716
 717                 _pam_log(LOG_CRIT, "error manipulating password");
 718                 return retval;
 719
 720         }
 721
 722         *pass = item;
 723         item = NULL;            /* break link to password */
 724
 725         return PAM_SUCCESS;
 726 }
 727
 728 const char *get_conf_item_string(int argc,
 729                                  const char **argv,
 730                                  int ctrl,
 731                                  const char *item,
 732                                  int flag)
 733 {
 734         int i = 0;
 735         char *parm = NULL;
 736         const char *parm_opt = NULL;
 737
 738         if (!(ctrl & flag)) {
 739                 goto out;
 740         }
 741
 742         /* let the pam opt take precedence over the smb.conf option */
 743         parm_opt = lp_parm_const_string(-1, "pam_winbind", item, NULL);
 744
 745         for ( i=0; i<argc; i++ ) {
 746
 747                 if ((strncmp(argv[i], item, strlen(item)) == 0)) {
 748                         char *p;
 749
 750                         parm = SMB_STRDUP(argv[i]);
 751
 752                         if ( (p = strchr( parm, '=' )) == NULL) {
 753                                 _pam_log(LOG_INFO, "no \"=\" delimiter for \"%s\" found\n", item);
 754                                 goto out;
 755                         }
 756                         SAFE_FREE(parm);
 757                         _pam_log_debug(ctrl, LOG_INFO, "PAM config: %s '%s'\n", item, p+1);
 758                         return p + 1;
 759                 }
 760         }
 761
 762         _pam_log_debug(ctrl, LOG_INFO, "CONFIG file: %s '%s'\n", item, parm_opt);
 763 out:
 764         SAFE_FREE(parm);
 765         return parm_opt;
 766 }
 767
 768 const char *get_krb5_cc_type_from_config(int argc, const char **argv, int ctrl)
 769 {
 770         return get_conf_item_string(argc, argv, ctrl, "krb5_ccache_type", WINBIND_KRB5_CCACHE_TYPE);
 771 }
 772
 773 const char *get_member_from_config(int argc, const char **argv, int ctrl)
 774 {
 775         const char *ret = NULL;
 776         ret = get_conf_item_string(argc, argv, ctrl, "require_membership_of", WINBIND_REQUIRED_MEMBERSHIP);
 777         if (ret) {
 778                 return ret;
 779         }
 780         return get_conf_item_string(argc, argv, ctrl, "require-membership-of", WINBIND_REQUIRED_MEMBERSHIP);
 781 }
 782
 783 PAM_EXTERN
 784 int pam_sm_authenticate(pam_handle_t *pamh, int flags,
 785                         int argc, const char **argv)
 786 {
 787         const char *username;
 788         const char *password;
 789         const char *member = NULL;
 790         const char *cctype = NULL;
 791         int retval = PAM_AUTH_ERR;
 792
 793         /* parse arguments */
 794         int ctrl = _pam_parse(argc, argv);
 795         if (ctrl == -1) {
 796                 return PAM_SYSTEM_ERR;
 797         }
 798
 799         _pam_log_debug(ctrl, LOG_DEBUG,"pam_winbind: pam_sm_authenticate");
 800
 801         /* Get the username */
 802         retval = pam_get_user(pamh, &username, NULL);
 803         if ((retval != PAM_SUCCESS) || (!username)) {
 804                 _pam_log_debug(ctrl, LOG_DEBUG, "can not get the username");
 805                 return PAM_SERVICE_ERR;
 806         }
 807
 808         retval = _winbind_read_password(pamh, ctrl, NULL,
 809                                         "Password: ", NULL,
 810                                         &password);
 811
 812         if (retval != PAM_SUCCESS) {
 813                 _pam_log(LOG_ERR, "Could not retrieve user's password");
 814                 return PAM_AUTHTOK_ERR;
 815         }
 816
 817         /* Let's not give too much away in the log file */
 818
 819 #ifdef DEBUG_PASSWORD
 820         _pam_log_debug(ctrl, LOG_INFO, "Verify user `%s' with password `%s'",
 821                        username, password);
 822 #else
 823         _pam_log_debug(ctrl, LOG_INFO, "Verify user `%s'", username);
 824 #endif
 825
 826         member = get_member_from_config(argc, argv, ctrl);
 827
 828         cctype = get_krb5_cc_type_from_config(argc, argv, ctrl);
 829
 830         /* Now use the username to look up password */
 831         retval = winbind_auth_request(pamh, ctrl, username, password, member, cctype, True);
 832
 833         if (retval == PAM_NEW_AUTHTOK_REQD ||
 834             retval == PAM_AUTHTOK_EXPIRED) {
 835
 836                 char *buf;
 837
 838                 if (!asprintf(&buf, "%d", retval)) {
 839                         return PAM_BUF_ERR;
 840                 }
 841
 842                 pam_set_data( pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, (void *)buf, _pam_winbind_cleanup_func);
 843
 844                 return PAM_SUCCESS;
 845         }
 846
 847         return retval;
 848 }
 849
 850 PAM_EXTERN
 851 int pam_sm_setcred(pam_handle_t *pamh, int flags,
 852                    int argc, const char **argv)
 853 {
 854         /* parse arguments */
 855         int ctrl = _pam_parse(argc, argv);
 856         if (ctrl == -1) {
 857                 return PAM_SYSTEM_ERR;
 858         }
 859
 860         _pam_log_debug(ctrl, LOG_DEBUG,"pam_winbind: pam_sm_setcred");
 861
 862         if (flags & PAM_DELETE_CRED) {
 863                 return pam_sm_close_session(pamh, flags, argc, argv);
 864         }
 865
 866         return PAM_SUCCESS;
 867 }
 868
 869 /*
 870  * Account management. We want to verify that the account exists
 871  * before returning PAM_SUCCESS
 872  */
 873 PAM_EXTERN
 874 int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
 875                    int argc, const char **argv)
 876 {
 877         const char *username;
 878         int retval = PAM_USER_UNKNOWN;
 879         void *tmp = NULL;
 880
 881         /* parse arguments */
 882         int ctrl = _pam_parse(argc, argv);
 883         if (ctrl == -1) {
 884                 return PAM_SYSTEM_ERR;
 885         }
 886
 887         _pam_log_debug(ctrl, LOG_DEBUG,"pam_winbind: pam_sm_acct_mgmt");
 888
 889
 890         /* Get the username */
 891         retval = pam_get_user(pamh, &username, NULL);
 892         if ((retval != PAM_SUCCESS) || (!username)) {
 893                 _pam_log_debug(ctrl, LOG_DEBUG,"can not get the username");
 894                 return PAM_SERVICE_ERR;
 895         }
 896
 897         /* Verify the username */
 898         retval = valid_user(username);
 899         switch (retval) {
 900         case -1:
 901                 /* some sort of system error. The log was already printed */
 902                 return PAM_SERVICE_ERR;
 903         case 1:
 904                 /* the user does not exist */
 905                 _pam_log_debug(ctrl, LOG_NOTICE, "user `%s' not found", username);
 906                 if (ctrl & WINBIND_UNKNOWN_OK_ARG) {
 907                         return PAM_IGNORE;
 908                 }
 909                 return PAM_USER_UNKNOWN;
 910         case 0:
 911                 pam_get_data( pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, (const void **)&tmp);
 912                 if (tmp != NULL) {
 913                         retval = atoi(tmp);
 914                         switch (retval) {
 915                         case PAM_AUTHTOK_EXPIRED:
 916                                 /* fall through, since new token is required in this case */
 917                         case PAM_NEW_AUTHTOK_REQD:
 918                                 _pam_log(LOG_WARNING, "pam_sm_acct_mgmt success but %s is set",
 919                                          PAM_WINBIND_NEW_AUTHTOK_REQD);
 920                                 _pam_log(LOG_NOTICE, "user '%s' needs new password", username);
 921                                 /* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */
 922                                 return PAM_NEW_AUTHTOK_REQD;
 923                         default:
 924                                 _pam_log(LOG_WARNING, "pam_sm_acct_mgmt success");
 925                                 _pam_log(LOG_NOTICE, "user '%s' granted access", username);
 926                                 return PAM_SUCCESS;
 927                         }
 928                 }
 929
 930                 /* Otherwise, the authentication looked good */
 931                 _pam_log(LOG_NOTICE, "user '%s' granted access", username);
 932                 return PAM_SUCCESS;
 933         default:
 934                 /* we don't know anything about this return value */
 935                 _pam_log(LOG_ERR, "internal module error (retval = %d, user = `%s')",
 936                          retval, username);
 937                 return PAM_SERVICE_ERR;
 938         }
 939
 940         /* should not be reached */
 941         return PAM_IGNORE;
 942 }
 943
 944 PAM_EXTERN
 945 int pam_sm_open_session(pam_handle_t *pamh, int flags,
 946                         int argc, const char **argv)
 947 {
 948         /* parse arguments */
 949         int ctrl = _pam_parse(argc, argv);
 950         if (ctrl == -1) {
 951                 return PAM_SYSTEM_ERR;
 952         }
 953
 954         _pam_log_debug(ctrl, LOG_DEBUG,"pam_winbind: pam_sm_open_session handler");
 955
 956
 957         if (ctrl & WINBIND_CREATE_HOMEDIR) {
 958
 959                 struct passwd *pwd = NULL;
 960                 const char *username;
 961                 int ret;
 962                 fstring tok;
 963                 fstring create_dir;
 964                 SMB_STRUCT_STAT sbuf;
 965
 966                 /* Get the username */
 967                 ret = pam_get_user(pamh, &username, NULL);
 968                 if ((ret != PAM_SUCCESS) || (!username)) {
 969                         _pam_log_debug(ctrl, LOG_DEBUG, "can not get the username");
 970                         return PAM_SERVICE_ERR;
 971                 }
 972
 973                 pwd = getpwnam(username);
 974                 if (pwd == NULL) {
 975                         _pam_log_debug(ctrl, LOG_DEBUG, "can not get the username");
 976                         return PAM_SERVICE_ERR;
 977                 }
 978
 979                 _pam_log_debug(ctrl, LOG_DEBUG, "homedir is: %s", pwd->pw_dir);
 980
 981                 if (directory_exist(pwd->pw_dir, &sbuf)) {
 982                         return PAM_SUCCESS;
 983                 }
 984
 985                 fstrcpy(create_dir, "/");
 986                 while (next_token((const char **)&pwd->pw_dir, tok, "/", sizeof(tok))) {
 987
 988                         mode_t mode = 0755;
 989
 990                         fstrcat(create_dir, tok);
 991                         fstrcat(create_dir, "/");
 992
 993                         if (!directory_exist(create_dir, &sbuf)) {
 994                                 if (mkdir(create_dir, mode) != 0) {
 995                                         _pam_log(LOG_ERR, "could not create dir: %s (%s)",
 996                                                  create_dir, strerror(errno));
 997                                         return PAM_SERVICE_ERR;
 998                                 }
 999                         }
1000                 }
1001
1002                 if (sys_chown(create_dir, pwd->pw_uid, pwd->pw_gid) != 0) {
1003                         _pam_log(LOG_ERR, "failed to chown user homedir: %s (%s)",
1004                                  create_dir, strerror(errno));
1005                         return PAM_SERVICE_ERR;
1006                 }
1007         }
1008
1009         return PAM_SUCCESS;
1010 }
1011
1012 PAM_EXTERN
1013 int pam_sm_close_session(pam_handle_t *pamh, int flags,
1014                          int argc, const char **argv)
1015 {
1016         /* parse arguments */
1017         int ctrl = _pam_parse(argc, argv);
1018         if (ctrl == -1) {
1019                 return PAM_SYSTEM_ERR;
1020         }
1021
1022         _pam_log_debug(ctrl, LOG_DEBUG,"pam_winbind: pam_sm_close_session handler");
1023
1024         if (!(flags & PAM_DELETE_CRED)) {
1025                 return PAM_SUCCESS;
1026         }
1027
1028         if (ctrl & WINBIND_KRB5_AUTH) {
1029
1030                 /* destroy the ccache here */
1031                 struct winbindd_request request;
1032                 struct winbindd_response response;
1033                 const char *user;
1034                 const char *ccname = NULL;
1035                 struct passwd *pwd = NULL;
1036
1037                 int retval;
1038
1039                 ZERO_STRUCT(request);
1040                 ZERO_STRUCT(response);
1041
1042                 retval = pam_get_user(pamh, &user, "Username: ");
1043                 if (retval == PAM_SUCCESS) {
1044                         if (user == NULL) {
1045                                 _pam_log(LOG_ERR, "username was NULL!");
1046                                 return PAM_USER_UNKNOWN;
1047                         }
1048                         if (retval == PAM_SUCCESS) {
1049                                 _pam_log_debug(ctrl, LOG_DEBUG, "username [%s] obtained", user);
1050                         }
1051                 } else {
1052                         _pam_log_debug(ctrl, LOG_DEBUG, "could not identify user");
1053                         return retval;
1054                 }
1055
1056                 ccname = pam_getenv(pamh, "KRB5CCNAME");
1057                 if (ccname == NULL) {
1058                         _pam_log_debug(ctrl, LOG_DEBUG, "user has no KRB5CCNAME environment");
1059                         return PAM_BUF_ERR;
1060                 }
1061
1062                 fstrcpy(request.data.logoff.user, user);
1063                 fstrcpy(request.data.logoff.krb5ccname, ccname);
1064
1065                 pwd = getpwnam(user);
1066                 if (pwd == NULL) {
1067                         return PAM_USER_UNKNOWN;
1068                 }
1069                 request.data.logoff.uid = pwd->pw_uid;
1070
1071                 request.flags = WBFLAG_PAM_KRB5 | WBFLAG_PAM_CONTACT_TRUSTDOM;
1072
1073                 return pam_winbind_request_log(pamh, ctrl, WINBINDD_PAM_LOGOFF, &request, &response, user);
1074         }
1075
1076         return PAM_SUCCESS;
1077 }
1078
1079
1080
1081 PAM_EXTERN
1082 int pam_sm_chauthtok(pam_handle_t * pamh, int flags,
1083                      int argc, const char **argv)
1084 {
1085         unsigned int lctrl;
1086         int retval;
1087         unsigned int ctrl;
1088
1089         /* <DO NOT free() THESE> */
1090         const char *user;
1091         char *pass_old, *pass_new;
1092         /* </DO NOT free() THESE> */
1093
1094         fstring Announce;
1095
1096         int retry = 0;
1097
1098         ctrl = _pam_parse(argc, argv);
1099         if (ctrl == -1) {
1100                 return PAM_SYSTEM_ERR;
1101         }
1102
1103         _pam_log_debug(ctrl, LOG_DEBUG,"pam_winbind: pam_sm_chauthtok");
1104
1105         /*
1106          * First get the name of a user
1107          */
1108         retval = pam_get_user(pamh, &user, "Username: ");
1109         if (retval == PAM_SUCCESS) {
1110                 if (user == NULL) {
1111                         _pam_log(LOG_ERR, "username was NULL!");
1112                         return PAM_USER_UNKNOWN;
1113                 }
1114                 if (retval == PAM_SUCCESS) {
1115                         _pam_log_debug(ctrl, LOG_DEBUG, "username [%s] obtained",
1116                                  user);
1117                 }
1118         } else {
1119                 _pam_log_debug(ctrl, LOG_DEBUG,
1120                          "password - could not identify user");
1121                 return retval;
1122         }
1123
1124         /*
1125          * obtain and verify the current password (OLDAUTHTOK) for
1126          * the user.
1127          */
1128
1129         if (flags & PAM_PRELIM_CHECK) {
1130
1131                 /* instruct user what is happening */
1132 #define greeting "Changing password for "
1133                 fstrcpy(Announce, greeting);
1134                 fstrcat(Announce, user);
1135 #undef greeting
1136
1137                 lctrl = ctrl | WINBIND__OLD_PASSWORD;
1138                 retval = _winbind_read_password(pamh, lctrl,
1139                                                 Announce,
1140                                                 "(current) NT password: ",
1141                                                 NULL,
1142                                                 (const char **) &pass_old);
1143                 if (retval != PAM_SUCCESS) {
1144                         _pam_log(LOG_NOTICE, "password - (old) token not obtained");
1145                         return retval;
1146                 }
1147                 /* verify that this is the password for this user */
1148
1149                 retval = winbind_auth_request(pamh, ctrl, user, pass_old, NULL, NULL, False);
1150
1151                 if (retval != PAM_ACCT_EXPIRED
1152                     && retval != PAM_AUTHTOK_EXPIRED
1153                     && retval != PAM_NEW_AUTHTOK_REQD
1154                     && retval != PAM_SUCCESS) {
1155                         pass_old = NULL;
1156                         return retval;
1157                 }
1158
1159                 retval = pam_set_item(pamh, PAM_OLDAUTHTOK, (const void *) pass_old);
1160                 pass_old = NULL;
1161                 if (retval != PAM_SUCCESS) {
1162                         _pam_log(LOG_CRIT, "failed to set PAM_OLDAUTHTOK");
1163                 }
1164         } else if (flags & PAM_UPDATE_AUTHTOK) {
1165
1166                 /*
1167                  * obtain the proposed password
1168                  */
1169
1170                 /*
1171                  * get the old token back.
1172                  */
1173
1174                 retval = pam_get_item(pamh, PAM_OLDAUTHTOK,
1175                                       (const void **) &pass_old);
1176
1177                 if (retval != PAM_SUCCESS) {
1178                         _pam_log(LOG_NOTICE, "user not authenticated");
1179                         return retval;
1180                 }
1181
1182                 lctrl = ctrl;
1183
1184                 if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) {
1185                         lctrl |= WINBIND_USE_FIRST_PASS_ARG;
1186                 }
1187                 retry = 0;
1188                 retval = PAM_AUTHTOK_ERR;
1189                 while ((retval != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) {
1190                         /*
1191                          * use_authtok is to force the use of a previously entered
1192                          * password -- needed for pluggable password strength checking
1193                          */
1194
1195                         retval = _winbind_read_password(pamh, lctrl,
1196                                                         NULL,
1197                                                         "Enter new NT password: ",
1198                                                         "Retype new NT password: ",
1199                                                         (const char **) &pass_new);
1200
1201                         if (retval != PAM_SUCCESS) {
1202                                 _pam_log_debug(ctrl, LOG_ALERT
1203                                          ,"password - new password not obtained");
1204                                 pass_old = NULL;/* tidy up */
1205                                 return retval;
1206                         }
1207
1208                         /*
1209                          * At this point we know who the user is and what they
1210                          * propose as their new password. Verify that the new
1211                          * password is acceptable.
1212                          */
1213
1214                         if (pass_new[0] == '\0') {/* "\0" password = NULL */
1215                                 pass_new = NULL;
1216                         }
1217                 }
1218
1219                 /*
1220                  * By reaching here we have approved the passwords and must now
1221                  * rebuild the password database file.
1222                  */
1223
1224                 retval = winbind_chauthtok_request(pamh, ctrl, user, pass_old, pass_new);
1225                 if (retval) {
1226                         _pam_overwrite(pass_new);
1227                         _pam_overwrite(pass_old);
1228                         pass_old = pass_new = NULL;
1229                         return retval;
1230                 }
1231
1232                 /* just in case we need krb5 creds after a password change over msrpc */
1233
1234                 if (ctrl & WINBIND_KRB5_AUTH) {
1235
1236                         const char *member = get_member_from_config(argc, argv, ctrl);
1237                         const char *cctype = get_krb5_cc_type_from_config(argc, argv, ctrl);
1238
1239                         retval = winbind_auth_request(pamh, ctrl, user, pass_new, member, cctype, False);
1240                         _pam_overwrite(pass_new);
1241                         _pam_overwrite(pass_old);
1242                         pass_old = pass_new = NULL;
1243                 }
1244         } else {
1245                 retval = PAM_SERVICE_ERR;
1246         }
1247
1248         return retval;
1249 }
1250
1251 #ifdef PAM_STATIC
1252
1253 /* static module data */
1254
1255 struct pam_module _pam_winbind_modstruct = {
1256         MODULE_NAME,
1257         pam_sm_authenticate,
1258         pam_sm_setcred,
1259         pam_sm_acct_mgmt,
1260         pam_sm_open_session,
1261         pam_sm_close_session,
1262         pam_sm_chauthtok
1263 };
1264
1265 #endif
1266
1267 /*
1268  * Copyright (c) Andrew Tridgell  <tridge@samba.org>   2000
1269  * Copyright (c) Tim Potter       <tpot@samba.org>     2000
1270  * Copyright (c) Andrew Bartlettt <abartlet@samba.org> 2002
1271  * Copyright (c) Guenther Deschner <gd@samba.org>      2005-2006
1272  * Copyright (c) Jan Rêkorajski 1999.
1273  * Copyright (c) Andrew G. Morgan 1996-8.
1274  * Copyright (c) Alex O. Yuriev, 1996.
1275  * Copyright (c) Cristian Gafton 1996.
1276  * Copyright (C) Elliot Lee <sopwith@redhat.com> 1996, Red Hat Software.
1277  *
1278  * Redistribution and use in source and binary forms, with or without
1279  * modification, are permitted provided that the following conditions
1280  * are met:
1281  * 1. Redistributions of source code must retain the above copyright
1282  *    notice, and the entire permission notice in its entirety,
1283  *    including the disclaimer of warranties.
1284  * 2. Redistributions in binary form must reproduce the above copyright
1285  *    notice, this list of conditions and the following disclaimer in the
1286  *    documentation and/or other materials provided with the distribution.
1287  * 3. The name of the author may not be used to endorse or promote
1288  *    products derived from this software without specific prior
1289  *    written permission.
1290  *
1291  * ALTERNATIVELY, this product may be distributed under the terms of
1292  * the GNU Public License, in which case the provisions of the GPL are
1293  * required INSTEAD OF the above restrictions.  (This clause is
1294  * necessary due to a potential bad interaction between the GPL and
1295  * the restrictions contained in a BSD-style copyright.)
1296  *
1297  * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
1298  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
1299  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
1300  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
1301  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
1302  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
1303  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
1304  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
1305  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
1306  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
1307  * OF THE POSSIBILITY OF SUCH DAMAGE.
1308  */