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> 2005-2008
   7
   8    largely based on pam_userdb by Cristian Gafton <gafton@redhat.com> also
   9    contains large slabs of code from pam_unix by Elliot Lee
  10    <sopwith@redhat.com> (see copyright below for full details)
  11 */
  12
  13 #define UID_WRAPPER_NOT_REPLACE
  14
  15 #include "pam_winbind.h"
  16
  17 static int wbc_error_to_pam_error(wbcErr status)
  18 {
  19         switch (status) {
  20                 case WBC_ERR_SUCCESS:
  21                         return PAM_SUCCESS;
  22                 case WBC_ERR_NOT_IMPLEMENTED:
  23                         return PAM_SERVICE_ERR;
  24                 case WBC_ERR_UNKNOWN_FAILURE:
  25                         break;
  26                 case WBC_ERR_NO_MEMORY:
  27                         return PAM_BUF_ERR;
  28                 case WBC_ERR_INVALID_SID:
  29                 case WBC_ERR_INVALID_PARAM:
  30                         break;
  31                 case WBC_ERR_WINBIND_NOT_AVAILABLE:
  32                         return PAM_AUTHINFO_UNAVAIL;
  33                 case WBC_ERR_DOMAIN_NOT_FOUND:
  34                         return PAM_AUTHINFO_UNAVAIL;
  35                 case WBC_ERR_INVALID_RESPONSE:
  36                         return PAM_BUF_ERR;
  37                 case WBC_ERR_NSS_ERROR:
  38                         return PAM_USER_UNKNOWN;
  39                 case WBC_ERR_AUTH_ERROR:
  40                         return PAM_AUTH_ERR;
  41                 case WBC_ERR_UNKNOWN_USER:
  42                         return PAM_USER_UNKNOWN;
  43                 case WBC_ERR_UNKNOWN_GROUP:
  44                         return PAM_USER_UNKNOWN;
  45                 case WBC_ERR_PWD_CHANGE_FAILED:
  46                         break;
  47         }
  48
  49         /* be paranoid */
  50         return PAM_AUTH_ERR;
  51 }
  52
  53 static const char *_pam_error_code_str(int err)
  54 {
  55         switch (err) {
  56                 case PAM_SUCCESS:
  57                         return "PAM_SUCCESS";
  58                 case PAM_OPEN_ERR:
  59                         return "PAM_OPEN_ERR";
  60                 case PAM_SYMBOL_ERR:
  61                         return "PAM_SYMBOL_ERR";
  62                 case PAM_SERVICE_ERR:
  63                         return "PAM_SERVICE_ERR";
  64                 case PAM_SYSTEM_ERR:
  65                         return "PAM_SYSTEM_ERR";
  66                 case PAM_BUF_ERR:
  67                         return "PAM_BUF_ERR";
  68                 case PAM_PERM_DENIED:
  69                         return "PAM_PERM_DENIED";
  70                 case PAM_AUTH_ERR:
  71                         return "PAM_AUTH_ERR";
  72                 case PAM_CRED_INSUFFICIENT:
  73                         return "PAM_CRED_INSUFFICIENT";
  74                 case PAM_AUTHINFO_UNAVAIL:
  75                         return "PAM_AUTHINFO_UNAVAIL";
  76                 case PAM_USER_UNKNOWN:
  77                         return "PAM_USER_UNKNOWN";
  78                 case PAM_MAXTRIES:
  79                         return "PAM_MAXTRIES";
  80                 case PAM_NEW_AUTHTOK_REQD:
  81                         return "PAM_NEW_AUTHTOK_REQD";
  82                 case PAM_ACCT_EXPIRED:
  83                         return "PAM_ACCT_EXPIRED";
  84                 case PAM_SESSION_ERR:
  85                         return "PAM_SESSION_ERR";
  86                 case PAM_CRED_UNAVAIL:
  87                         return "PAM_CRED_UNAVAIL";
  88                 case PAM_CRED_EXPIRED:
  89                         return "PAM_CRED_EXPIRED";
  90                 case PAM_CRED_ERR:
  91                         return "PAM_CRED_ERR";
  92                 case PAM_NO_MODULE_DATA:
  93                         return "PAM_NO_MODULE_DATA";
  94                 case PAM_CONV_ERR:
  95                         return "PAM_CONV_ERR";
  96                 case PAM_AUTHTOK_ERR:
  97                         return "PAM_AUTHTOK_ERR";
  98                 case PAM_AUTHTOK_RECOVER_ERR:
  99                         return "PAM_AUTHTOK_RECOVER_ERR";
 100                 case PAM_AUTHTOK_LOCK_BUSY:
 101                         return "PAM_AUTHTOK_LOCK_BUSY";
 102                 case PAM_AUTHTOK_DISABLE_AGING:
 103                         return "PAM_AUTHTOK_DISABLE_AGING";
 104                 case PAM_TRY_AGAIN:
 105                         return "PAM_TRY_AGAIN";
 106                 case PAM_IGNORE:
 107                         return "PAM_IGNORE";
 108                 case PAM_ABORT:
 109                         return "PAM_ABORT";
 110                 case PAM_AUTHTOK_EXPIRED:
 111                         return "PAM_AUTHTOK_EXPIRED";
 112 #ifdef PAM_MODULE_UNKNOWN
 113                 case PAM_MODULE_UNKNOWN:
 114                         return "PAM_MODULE_UNKNOWN";
 115 #endif
 116 #ifdef PAM_BAD_ITEM
 117                 case PAM_BAD_ITEM:
 118                         return "PAM_BAD_ITEM";
 119 #endif
 120 #ifdef PAM_CONV_AGAIN
 121                 case PAM_CONV_AGAIN:
 122                         return "PAM_CONV_AGAIN";
 123 #endif
 124 #ifdef PAM_INCOMPLETE
 125                 case PAM_INCOMPLETE:
 126                         return "PAM_INCOMPLETE";
 127 #endif
 128                 default:
 129                         return NULL;
 130         }
 131 }
 132
 133 #define _PAM_LOG_FUNCTION_ENTER(function, ctx) \
 134         do { \
 135                 _pam_log_debug(ctx, LOG_DEBUG, "[pamh: %p] ENTER: " \
 136                                function " (flags: 0x%04x)", ctx->pamh, ctx->flags); \
 137                 _pam_log_state(ctx); \
 138         } while (0)
 139
 140 #define _PAM_LOG_FUNCTION_LEAVE(function, ctx, retval) \
 141         do { \
 142                 _pam_log_debug(ctx, LOG_DEBUG, "[pamh: %p] LEAVE: " \
 143                                function " returning %d (%s)", ctx->pamh, retval, \
 144                                _pam_error_code_str(retval)); \
 145                 _pam_log_state(ctx); \
 146         } while (0)
 147
 148 /* data tokens */
 149
 150 #define MAX_PASSWD_TRIES        3
 151
 152 #ifdef HAVE_GETTEXT
 153 static char initialized = 0;
 154
 155 static inline void textdomain_init(void);
 156 static inline void textdomain_init(void)
 157 {
 158         if (!initialized) {
 159                 bindtextdomain(MODULE_NAME, LOCALEDIR);
 160                 initialized = 1;
 161         }
 162         return;
 163 }
 164 #endif
 165
 166
 167 /* some syslogging */
 168
 169 #ifdef HAVE_PAM_VSYSLOG
 170 static void _pam_log_int(const pam_handle_t *pamh,
 171                          int err,
 172                          const char *format,
 173                          va_list args)
 174 {
 175         pam_vsyslog(pamh, err, format, args);
 176 }
 177 #else
 178 static void _pam_log_int(const pam_handle_t *pamh,
 179                          int err,
 180                          const char *format,
 181                          va_list args)
 182 {
 183         char *format2 = NULL;
 184         const char *service;
 185
 186         pam_get_item(pamh, PAM_SERVICE, (const void **) &service);
 187
 188         format2 = (char *)malloc(strlen(MODULE_NAME)+strlen(format)+strlen(service)+5);
 189         if (format2 == NULL) {
 190                 /* what else todo ? */
 191                 vsyslog(err, format, args);
 192                 return;
 193         }
 194
 195         sprintf(format2, "%s(%s): %s", MODULE_NAME, service, format);
 196         vsyslog(err, format2, args);
 197         SAFE_FREE(format2);
 198 }
 199 #endif /* HAVE_PAM_VSYSLOG */
 200
 201 static bool _pam_log_is_silent(int ctrl)
 202 {
 203         return on(ctrl, WINBIND_SILENT);
 204 }
 205
 206 static void _pam_log(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
 207 static void _pam_log(struct pwb_context *r, int err, const char *format, ...)
 208 {
 209         va_list args;
 210
 211         if (_pam_log_is_silent(r->ctrl)) {
 212                 return;
 213         }
 214
 215         va_start(args, format);
 216         _pam_log_int(r->pamh, err, format, args);
 217         va_end(args);
 218 }
 219 static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
 220 static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
 221 {
 222         va_list args;
 223
 224         if (_pam_log_is_silent(ctrl)) {
 225                 return;
 226         }
 227
 228         va_start(args, format);
 229         _pam_log_int(pamh, err, format, args);
 230         va_end(args);
 231 }
 232
 233 static bool _pam_log_is_debug_enabled(int ctrl)
 234 {
 235         if (ctrl == -1) {
 236                 return false;
 237         }
 238
 239         if (_pam_log_is_silent(ctrl)) {
 240                 return false;
 241         }
 242
 243         if (!(ctrl & WINBIND_DEBUG_ARG)) {
 244                 return false;
 245         }
 246
 247         return true;
 248 }
 249
 250 static bool _pam_log_is_debug_state_enabled(int ctrl)
 251 {
 252         if (!(ctrl & WINBIND_DEBUG_STATE)) {
 253                 return false;
 254         }
 255
 256         return _pam_log_is_debug_enabled(ctrl);
 257 }
 258
 259 static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
 260 static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...)
 261 {
 262         va_list args;
 263
 264         if (!_pam_log_is_debug_enabled(r->ctrl)) {
 265                 return;
 266         }
 267
 268         va_start(args, format);
 269         _pam_log_int(r->pamh, err, format, args);
 270         va_end(args);
 271 }
 272 static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
 273 static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
 274 {
 275         va_list args;
 276
 277         if (!_pam_log_is_debug_enabled(ctrl)) {
 278                 return;
 279         }
 280
 281         va_start(args, format);
 282         _pam_log_int(pamh, err, format, args);
 283         va_end(args);
 284 }
 285
 286 static void _pam_log_state_datum(struct pwb_context *ctx,
 287                                  int item_type,
 288                                  const char *key,
 289                                  int is_string)
 290 {
 291         const void *data = NULL;
 292         if (item_type != 0) {
 293                 pam_get_item(ctx->pamh, item_type, &data);
 294         } else {
 295                 pam_get_data(ctx->pamh, key, &data);
 296         }
 297         if (data != NULL) {
 298                 const char *type = (item_type != 0) ? "ITEM" : "DATA";
 299                 if (is_string != 0) {
 300                         _pam_log_debug(ctx, LOG_DEBUG,
 301                                        "[pamh: %p] STATE: %s(%s) = \"%s\" (%p)",
 302                                        ctx->pamh, type, key, (const char *)data,
 303                                        data);
 304                 } else {
 305                         _pam_log_debug(ctx, LOG_DEBUG,
 306                                        "[pamh: %p] STATE: %s(%s) = %p",
 307                                        ctx->pamh, type, key, data);
 308                 }
 309         }
 310 }
 311
 312 #define _PAM_LOG_STATE_DATA_POINTER(ctx, module_data_name) \
 313         _pam_log_state_datum(ctx, 0, module_data_name, 0)
 314
 315 #define _PAM_LOG_STATE_DATA_STRING(ctx, module_data_name) \
 316         _pam_log_state_datum(ctx, 0, module_data_name, 1)
 317
 318 #define _PAM_LOG_STATE_ITEM_POINTER(ctx, item_type) \
 319         _pam_log_state_datum(ctx, item_type, #item_type, 0)
 320
 321 #define _PAM_LOG_STATE_ITEM_STRING(ctx, item_type) \
 322         _pam_log_state_datum(ctx, item_type, #item_type, 1)
 323
 324 #ifdef DEBUG_PASSWORD
 325 #define _LOG_PASSWORD_AS_STRING 1
 326 #else
 327 #define _LOG_PASSWORD_AS_STRING 0
 328 #endif
 329
 330 #define _PAM_LOG_STATE_ITEM_PASSWORD(ctx, item_type) \
 331         _pam_log_state_datum(ctx, item_type, #item_type, \
 332                              _LOG_PASSWORD_AS_STRING)
 333
 334 static void _pam_log_state(struct pwb_context *ctx)
 335 {
 336         if (!_pam_log_is_debug_state_enabled(ctx->ctrl)) {
 337                 return;
 338         }
 339
 340         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_SERVICE);
 341         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER);
 342         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_TTY);
 343         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RHOST);
 344         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RUSER);
 345         _PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_OLDAUTHTOK);
 346         _PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_AUTHTOK);
 347         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER_PROMPT);
 348         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_CONV);
 349 #ifdef PAM_FAIL_DELAY
 350         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_FAIL_DELAY);
 351 #endif
 352 #ifdef PAM_REPOSITORY
 353         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_REPOSITORY);
 354 #endif
 355
 356         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_HOMEDIR);
 357         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSCRIPT);
 358         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSERVER);
 359         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_PROFILEPATH);
 360         _PAM_LOG_STATE_DATA_STRING(ctx,
 361                                    PAM_WINBIND_NEW_AUTHTOK_REQD);
 362                                    /* Use atoi to get PAM result code */
 363         _PAM_LOG_STATE_DATA_STRING(ctx,
 364                                    PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH);
 365         _PAM_LOG_STATE_DATA_POINTER(ctx, PAM_WINBIND_PWD_LAST_SET);
 366 }
 367
 368 static int _pam_parse(const pam_handle_t *pamh,
 369                       int flags,
 370                       int argc,
 371                       const char **argv,
 372                       dictionary **result_d)
 373 {
 374         int ctrl = 0;
 375         const char *config_file = NULL;
 376         int i;
 377         const char **v;
 378         dictionary *d = NULL;
 379
 380         if (flags & PAM_SILENT) {
 381                 ctrl |= WINBIND_SILENT;
 382         }
 383
 384         for (i=argc,v=argv; i-- > 0; ++v) {
 385                 if (!strncasecmp(*v, "config", strlen("config"))) {
 386                         ctrl |= WINBIND_CONFIG_FILE;
 387                         config_file = v[i];
 388                         break;
 389                 }
 390         }
 391
 392         if (config_file == NULL) {
 393                 config_file = PAM_WINBIND_CONFIG_FILE;
 394         }
 395
 396         d = iniparser_load(discard_const_p(char, config_file));
 397         if (d == NULL) {
 398                 goto config_from_pam;
 399         }
 400
 401         if (iniparser_getboolean(d, discard_const_p(char, "global:debug"), false)) {
 402                 ctrl |= WINBIND_DEBUG_ARG;
 403         }
 404
 405         if (iniparser_getboolean(d, discard_const_p(char, "global:debug_state"), false)) {
 406                 ctrl |= WINBIND_DEBUG_STATE;
 407         }
 408
 409         if (iniparser_getboolean(d, discard_const_p(char, "global:cached_login"), false)) {
 410                 ctrl |= WINBIND_CACHED_LOGIN;
 411         }
 412
 413         if (iniparser_getboolean(d, discard_const_p(char, "global:krb5_auth"), false)) {
 414                 ctrl |= WINBIND_KRB5_AUTH;
 415         }
 416
 417         if (iniparser_getboolean(d, discard_const_p(char, "global:silent"), false)) {
 418                 ctrl |= WINBIND_SILENT;
 419         }
 420
 421         if (iniparser_getstring(d, discard_const_p(char, "global:krb5_ccache_type"), NULL) != NULL) {
 422                 ctrl |= WINBIND_KRB5_CCACHE_TYPE;
 423         }
 424
 425         if ((iniparser_getstring(d, discard_const_p(char, "global:require-membership-of"), NULL)
 426              != NULL) ||
 427             (iniparser_getstring(d, discard_const_p(char, "global:require_membership_of"), NULL)
 428              != NULL)) {
 429                 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 430         }
 431
 432         if (iniparser_getboolean(d, discard_const_p(char, "global:try_first_pass"), false)) {
 433                 ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
 434         }
 435
 436         if (iniparser_getint(d, discard_const_p(char, "global:warn_pwd_expire"), 0)) {
 437                 ctrl |= WINBIND_WARN_PWD_EXPIRE;
 438         }
 439
 440         if (iniparser_getboolean(d, discard_const_p(char, "global:mkhomedir"), false)) {
 441                 ctrl |= WINBIND_MKHOMEDIR;
 442         }
 443
 444 config_from_pam:
 445         /* step through arguments */
 446         for (i=argc,v=argv; i-- > 0; ++v) {
 447
 448                 /* generic options */
 449                 if (!strcmp(*v,"debug"))
 450                         ctrl |= WINBIND_DEBUG_ARG;
 451                 else if (!strcasecmp(*v, "debug_state"))
 452                         ctrl |= WINBIND_DEBUG_STATE;
 453                 else if (!strcasecmp(*v, "silent"))
 454                         ctrl |= WINBIND_SILENT;
 455                 else if (!strcasecmp(*v, "use_authtok"))
 456                         ctrl |= WINBIND_USE_AUTHTOK_ARG;
 457                 else if (!strcasecmp(*v, "use_first_pass"))
 458                         ctrl |= WINBIND_USE_FIRST_PASS_ARG;
 459                 else if (!strcasecmp(*v, "try_first_pass"))
 460                         ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
 461                 else if (!strcasecmp(*v, "unknown_ok"))
 462                         ctrl |= WINBIND_UNKNOWN_OK_ARG;
 463                 else if (!strncasecmp(*v, "require_membership_of",
 464                                       strlen("require_membership_of")))
 465                         ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 466                 else if (!strncasecmp(*v, "require-membership-of",
 467                                       strlen("require-membership-of")))
 468                         ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 469                 else if (!strcasecmp(*v, "krb5_auth"))
 470                         ctrl |= WINBIND_KRB5_AUTH;
 471                 else if (!strncasecmp(*v, "krb5_ccache_type",
 472                                       strlen("krb5_ccache_type")))
 473                         ctrl |= WINBIND_KRB5_CCACHE_TYPE;
 474                 else if (!strcasecmp(*v, "cached_login"))
 475                         ctrl |= WINBIND_CACHED_LOGIN;
 476                 else if (!strcasecmp(*v, "mkhomedir"))
 477                         ctrl |= WINBIND_MKHOMEDIR;
 478                 else if (!strncasecmp(*v, "warn_pwd_expire",
 479                                       strlen("warn_pwd_expire")))
 480                         ctrl |= WINBIND_WARN_PWD_EXPIRE;
 481                 else {
 482                         __pam_log(pamh, ctrl, LOG_ERR,
 483                                  "pam_parse: unknown option: %s", *v);
 484                         return -1;
 485                 }
 486
 487         }
 488
 489         if (result_d) {
 490                 *result_d = d;
 491         } else {
 492                 if (d) {
 493                         iniparser_freedict(d);
 494                 }
 495         }
 496
 497         return ctrl;
 498 };
 499
 500 static int _pam_winbind_free_context(struct pwb_context *ctx)
 501 {
 502         if (!ctx) {
 503                 return 0;
 504         }
 505
 506         if (ctx->dict) {
 507                 iniparser_freedict(ctx->dict);
 508         }
 509
 510         return 0;
 511 }
 512
 513 static int _pam_winbind_init_context(pam_handle_t *pamh,
 514                                      int flags,
 515                                      int argc,
 516                                      const char **argv,
 517                                      struct pwb_context **ctx_p)
 518 {
 519         struct pwb_context *r = NULL;
 520
 521 #ifdef HAVE_GETTEXT
 522         textdomain_init();
 523 #endif
 524
 525         r = talloc_zero(NULL, struct pwb_context);
 526         if (!r) {
 527                 return PAM_BUF_ERR;
 528         }
 529
 530         talloc_set_destructor(r, _pam_winbind_free_context);
 531
 532         r->pamh = pamh;
 533         r->flags = flags;
 534         r->argc = argc;
 535         r->argv = argv;
 536         r->ctrl = _pam_parse(pamh, flags, argc, argv, &r->dict);
 537         if (r->ctrl == -1) {
 538                 TALLOC_FREE(r);
 539                 return PAM_SYSTEM_ERR;
 540         }
 541
 542         *ctx_p = r;
 543
 544         return PAM_SUCCESS;
 545 }
 546
 547 static void _pam_winbind_cleanup_func(pam_handle_t *pamh,
 548                                       void *data,
 549                                       int error_status)
 550 {
 551         int ctrl = _pam_parse(pamh, 0, 0, NULL, NULL);
 552         if (_pam_log_is_debug_state_enabled(ctrl)) {
 553                 __pam_log_debug(pamh, ctrl, LOG_DEBUG,
 554                                "[pamh: %p] CLEAN: cleaning up PAM data %p "
 555                                "(error_status = %d)", pamh, data,
 556                                error_status);
 557         }
 558         TALLOC_FREE(data);
 559 }
 560
 561
 562 static const struct ntstatus_errors {
 563         const char *ntstatus_string;
 564         const char *error_string;
 565 } ntstatus_errors[] = {
 566         {"NT_STATUS_OK",
 567                 N_("Success")},
 568         {"NT_STATUS_BACKUP_CONTROLLER",
 569                 N_("No primary Domain Controler available")},
 570         {"NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
 571                 N_("No domain controllers found")},
 572         {"NT_STATUS_NO_LOGON_SERVERS",
 573                 N_("No logon servers")},
 574         {"NT_STATUS_PWD_TOO_SHORT",
 575                 N_("Password too short")},
 576         {"NT_STATUS_PWD_TOO_RECENT",
 577                 N_("The password of this user is too recent to change")},
 578         {"NT_STATUS_PWD_HISTORY_CONFLICT",
 579                 N_("Password is already in password history")},
 580         {"NT_STATUS_PASSWORD_EXPIRED",
 581                 N_("Your password has expired")},
 582         {"NT_STATUS_PASSWORD_MUST_CHANGE",
 583                 N_("You need to change your password now")},
 584         {"NT_STATUS_INVALID_WORKSTATION",
 585                 N_("You are not allowed to logon from this workstation")},
 586         {"NT_STATUS_INVALID_LOGON_HOURS",
 587                 N_("You are not allowed to logon at this time")},
 588         {"NT_STATUS_ACCOUNT_EXPIRED",
 589                 N_("Your account has expired. "
 590                    "Please contact your System administrator")}, /* SCNR */
 591         {"NT_STATUS_ACCOUNT_DISABLED",
 592                 N_("Your account is disabled. "
 593                    "Please contact your System administrator")}, /* SCNR */
 594         {"NT_STATUS_ACCOUNT_LOCKED_OUT",
 595                 N_("Your account has been locked. "
 596                    "Please contact your System administrator")}, /* SCNR */
 597         {"NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
 598                 N_("Invalid Trust Account")},
 599         {"NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
 600                 N_("Invalid Trust Account")},
 601         {"NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
 602                 N_("Invalid Trust Account")},
 603         {"NT_STATUS_ACCESS_DENIED",
 604                 N_("Access is denied")},
 605         {NULL, NULL}
 606 };
 607
 608 static const char *_get_ntstatus_error_string(const char *nt_status_string)
 609 {
 610         int i;
 611         for (i=0; ntstatus_errors[i].ntstatus_string != NULL; i++) {
 612                 if (!strcasecmp(ntstatus_errors[i].ntstatus_string,
 613                                 nt_status_string)) {
 614                         return _(ntstatus_errors[i].error_string);
 615                 }
 616         }
 617         return NULL;
 618 }
 619
 620 /* --- authentication management functions --- */
 621
 622 /* Attempt a conversation */
 623
 624 static int converse(const pam_handle_t *pamh,
 625                     int nargs,
 626                     struct pam_message **message,
 627                     struct pam_response **response)
 628 {
 629         int retval;
 630         struct pam_conv *conv;
 631
 632         retval = pam_get_item(pamh, PAM_CONV, (const void **) &conv);
 633         if (retval == PAM_SUCCESS) {
 634                 retval = conv->conv(nargs,
 635                                     (const struct pam_message **)message,
 636                                     response, conv->appdata_ptr);
 637         }
 638
 639         return retval; /* propagate error status */
 640 }
 641
 642
 643 static int _make_remark(struct pwb_context *ctx,
 644                         int type,
 645                         const char *text)
 646 {
 647         int retval = PAM_SUCCESS;
 648
 649         struct pam_message *pmsg[1], msg[1];
 650         struct pam_response *resp;
 651
 652         if (ctx->flags & WINBIND_SILENT) {
 653                 return PAM_SUCCESS;
 654         }
 655
 656         pmsg[0] = &msg[0];
 657         msg[0].msg = discard_const_p(char, text);
 658         msg[0].msg_style = type;
 659
 660         resp = NULL;
 661         retval = converse(ctx->pamh, 1, pmsg, &resp);
 662
 663         if (resp) {
 664                 _pam_drop_reply(resp, 1);
 665         }
 666         return retval;
 667 }
 668
 669 static int _make_remark_v(struct pwb_context *ctx,
 670                           int type,
 671                           const char *format,
 672                           va_list args)
 673 {
 674         char *var;
 675         int ret;
 676
 677         ret = vasprintf(&var, format, args);
 678         if (ret < 0) {
 679                 _pam_log(ctx, LOG_ERR, "memory allocation failure");
 680                 return ret;
 681         }
 682
 683         ret = _make_remark(ctx, type, var);
 684         SAFE_FREE(var);
 685         return ret;
 686 }
 687
 688 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
 689 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...)
 690 {
 691         int ret;
 692         va_list args;
 693
 694         va_start(args, format);
 695         ret = _make_remark_v(ctx, type, format, args);
 696         va_end(args);
 697         return ret;
 698 }
 699
 700 static int pam_winbind_request_log(struct pwb_context *ctx,
 701                                    int retval,
 702                                    const char *user,
 703                                    const char *fn)
 704 {
 705         switch (retval) {
 706         case PAM_AUTH_ERR:
 707                 /* incorrect password */
 708                 _pam_log(ctx, LOG_WARNING, "user '%s' denied access "
 709                          "(incorrect password or invalid membership)", user);
 710                 return retval;
 711         case PAM_ACCT_EXPIRED:
 712                 /* account expired */
 713                 _pam_log(ctx, LOG_WARNING, "user '%s' account expired",
 714                          user);
 715                 return retval;
 716         case PAM_AUTHTOK_EXPIRED:
 717                 /* password expired */
 718                 _pam_log(ctx, LOG_WARNING, "user '%s' password expired",
 719                          user);
 720                 return retval;
 721         case PAM_NEW_AUTHTOK_REQD:
 722                 /* new password required */
 723                 _pam_log(ctx, LOG_WARNING, "user '%s' new password "
 724                          "required", user);
 725                 return retval;
 726         case PAM_USER_UNKNOWN:
 727                 /* the user does not exist */
 728                 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
 729                                user);
 730                 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
 731                         return PAM_IGNORE;
 732                 }
 733                 return retval;
 734         case PAM_SUCCESS:
 735                 /* Otherwise, the authentication looked good */
 736                 if (strcmp(fn, "wbcLogonUser") == 0) {
 737                         _pam_log(ctx, LOG_NOTICE,
 738                                  "user '%s' granted access", user);
 739                 } else {
 740                         _pam_log(ctx, LOG_NOTICE,
 741                                  "user '%s' OK", user);
 742                 }
 743                 return retval;
 744         default:
 745                 /* we don't know anything about this return value */
 746                 _pam_log(ctx, LOG_ERR,
 747                          "internal module error (retval = %s(%d), user = '%s')",
 748                         _pam_error_code_str(retval), retval, user);
 749                 return retval;
 750         }
 751 }
 752
 753 static int wbc_auth_error_to_pam_error(struct pwb_context *ctx,
 754                                        struct wbcAuthErrorInfo *e,
 755                                        wbcErr status,
 756                                        const char *username,
 757                                        const char *fn)
 758 {
 759         int ret = PAM_AUTH_ERR;
 760
 761         if (WBC_ERROR_IS_OK(status)) {
 762                 _pam_log_debug(ctx, LOG_DEBUG, "request %s succeeded",
 763                         fn);
 764                 ret = PAM_SUCCESS;
 765                 return pam_winbind_request_log(ctx, ret, username, fn);
 766         }
 767
 768         if (e) {
 769                 if (e->pam_error != PAM_SUCCESS) {
 770                         _pam_log(ctx, LOG_ERR,
 771                                  "request %s failed: %s, "
 772                                  "PAM error: %s (%d), NTSTATUS: %s, "
 773                                  "Error message was: %s",
 774                                  fn,
 775                                  wbcErrorString(status),
 776                                  _pam_error_code_str(e->pam_error),
 777                                  e->pam_error,
 778                                  e->nt_string,
 779                                  e->display_string);
 780                         ret = e->pam_error;
 781                         return pam_winbind_request_log(ctx, ret, username, fn);
 782                 }
 783
 784                 _pam_log(ctx, LOG_ERR, "request %s failed, but PAM error 0!", fn);
 785
 786                 ret = PAM_SERVICE_ERR;
 787                 return pam_winbind_request_log(ctx, ret, username, fn);
 788         }
 789
 790         ret = wbc_error_to_pam_error(status);
 791         return pam_winbind_request_log(ctx, ret, username, fn);
 792 }
 793
 794 #if defined(HAVE_PAM_RADIO_TYPE)
 795 static bool _pam_winbind_change_pwd(struct pwb_context *ctx)
 796 {
 797         struct pam_message msg, *pmsg;
 798         struct pam_response *resp = NULL;
 799         int ret;
 800         bool retval = false;
 801         pmsg = &msg;
 802         msg.msg_style = PAM_RADIO_TYPE;
 803         msg.msg = _("Do you want to change your password now?");
 804         ret = converse(ctx->pamh, 1, &pmsg, &resp);
 805         if (resp == NULL) {
 806                 if (ret == PAM_SUCCESS) {
 807                         _pam_log(ctx, LOG_CRIT, "pam_winbind: system error!\n");
 808                         return false;
 809                 }
 810         }
 811         if (ret != PAM_SUCCESS) {
 812                 return false;
 813         }
 814         _pam_log(ctx, LOG_CRIT, "Received [%s] reply from application.\n", resp->resp);
 815
 816         if ((resp->resp != NULL) && (strcasecmp(resp->resp, "yes") == 0)) {
 817                 retval = true;
 818         }
 819
 820         _pam_drop_reply(resp, 1);
 821         return retval;
 822 }
 823 #else
 824 static bool _pam_winbind_change_pwd(struct pwb_context *ctx)
 825 {
 826         return false;
 827 }
 828 #endif
 829
 830 /**
 831  * send a password expiry message if required
 832  *
 833  * @param ctx PAM winbind context.
 834  * @param next_change expected (calculated) next expiry date.
 835  * @param already_expired pointer to a boolean to indicate if the password is
 836  *        already expired.
 837  *
 838  * @return boolean Returns true if message has been sent, false if not.
 839  */
 840
 841 static bool _pam_send_password_expiry_message(struct pwb_context *ctx,
 842                                               time_t next_change,
 843                                               time_t now,
 844                                               int warn_pwd_expire,
 845                                               bool *already_expired,
 846                                               bool *change_pwd)
 847 {
 848         int days = 0;
 849         struct tm tm_now, tm_next_change;
 850         bool retval = false;
 851         int ret;
 852
 853         if (already_expired) {
 854                 *already_expired = false;
 855         }
 856
 857         if (change_pwd) {
 858                 *change_pwd = false;
 859         }
 860
 861         if (next_change <= now) {
 862                 PAM_WB_REMARK_DIRECT(ctx, "NT_STATUS_PASSWORD_EXPIRED");
 863                 if (already_expired) {
 864                         *already_expired = true;
 865                 }
 866                 return true;
 867         }
 868
 869         if ((next_change < 0) ||
 870             (next_change > now + warn_pwd_expire * SECONDS_PER_DAY)) {
 871                 return false;
 872         }
 873
 874         if ((localtime_r(&now, &tm_now) == NULL) ||
 875             (localtime_r(&next_change, &tm_next_change) == NULL)) {
 876                 return false;
 877         }
 878
 879         days = (tm_next_change.tm_yday+tm_next_change.tm_year*365) -
 880                (tm_now.tm_yday+tm_now.tm_year*365);
 881
 882         if (days == 0) {
 883                 ret = _make_remark(ctx, PAM_TEXT_INFO,
 884                                 _("Your password expires today.\n"));
 885
 886                 /*
 887                  * If change_pwd and already_expired is null.
 888                  * We are just sending a notification message.
 889                  * We don't expect any response in this case.
 890                  */
 891
 892                 if (!change_pwd && !already_expired) {
 893                         return true;
 894                 }
 895
 896                 /*
 897                  * successfully sent the warning message.
 898                  * Give the user a chance to change pwd.
 899                  */
 900                 if (ret == PAM_SUCCESS) {
 901                         if (change_pwd) {
 902                                 retval = _pam_winbind_change_pwd(ctx);
 903                                 if (retval) {
 904                                         *change_pwd = true;
 905                                 }
 906                         }
 907                 }
 908                 return true;
 909         }
 910
 911         if (days > 0 && days < warn_pwd_expire) {
 912
 913                 ret = _make_remark_format(ctx, PAM_TEXT_INFO,
 914                                         _("Your password will expire in %d %s.\n"),
 915                                         days, (days > 1) ? _("days"):_("day"));
 916                 /*
 917                  * If change_pwd and already_expired is null.
 918                  * We are just sending a notification message.
 919                  * We don't expect any response in this case.
 920                  */
 921
 922                 if (!change_pwd && !already_expired) {
 923                         return true;
 924                 }
 925
 926                 /*
 927                  * successfully sent the warning message.
 928                  * Give the user a chance to change pwd.
 929                  */
 930                 if (ret == PAM_SUCCESS) {
 931                         if (change_pwd) {
 932                                 retval = _pam_winbind_change_pwd(ctx);
 933                                 if (retval) {
 934                                         *change_pwd = true;
 935                                 }
 936                         }
 937                 }
 938                 return true;
 939         }
 940
 941         return false;
 942 }
 943
 944 /**
 945  * Send a warning if the password expires in the near future
 946  *
 947  * @param ctx PAM winbind context.
 948  * @param response The full authentication response structure.
 949  * @param already_expired boolean, is the pwd already expired?
 950  *
 951  * @return void.
 952  */
 953
 954 static void _pam_warn_password_expiry(struct pwb_context *ctx,
 955                                       const struct wbcAuthUserInfo *info,
 956                                       const struct wbcUserPasswordPolicyInfo *policy,
 957                                       int warn_pwd_expire,
 958                                       bool *already_expired,
 959                                       bool *change_pwd)
 960 {
 961         time_t now = time(NULL);
 962         time_t next_change = 0;
 963
 964         if (!info || !policy) {
 965                 return;
 966         }
 967
 968         if (already_expired) {
 969                 *already_expired = false;
 970         }
 971
 972         if (change_pwd) {
 973                 *change_pwd = false;
 974         }
 975
 976         /* accounts with WBC_ACB_PWNOEXP set never receive a warning */
 977         if (info->acct_flags & WBC_ACB_PWNOEXP) {
 978                 return;
 979         }
 980
 981         /* no point in sending a warning if this is a grace logon */
 982         if (PAM_WB_GRACE_LOGON(info->user_flags)) {
 983                 return;
 984         }
 985
 986         /* check if the info3 must change timestamp has been set */
 987         next_change = info->pass_must_change_time;
 988
 989         if (_pam_send_password_expiry_message(ctx, next_change, now,
 990                                               warn_pwd_expire,
 991                                               already_expired,
 992                                               change_pwd)) {
 993                 return;
 994         }
 995
 996         /* now check for the global password policy */
 997         /* good catch from Ralf Haferkamp: an expiry of "never" is translated
 998          * to -1 */
 999         if ((policy->expire == (int64_t)-1) ||
1000             (policy->expire == 0)) {
1001                 return;
1002         }
1003
1004         next_change = info->pass_last_set_time + policy->expire;
1005
1006         if (_pam_send_password_expiry_message(ctx, next_change, now,
1007                                               warn_pwd_expire,
1008                                               already_expired,
1009                                               change_pwd)) {
1010                 return;
1011         }
1012
1013         /* no warning sent */
1014 }
1015
1016 #define IS_SID_STRING(name) (strncmp("S-", name, 2) == 0)
1017
1018 /**
1019  * Append a string, making sure not to overflow and to always return a
1020  * NULL-terminated string.
1021  *
1022  * @param dest Destination string buffer (must already be NULL-terminated).
1023  * @param src Source string buffer.
1024  * @param dest_buffer_size Size of dest buffer in bytes.
1025  *
1026  * @return false if dest buffer is not big enough (no bytes copied), true on
1027  * success.
1028  */
1029
1030 static bool safe_append_string(char *dest,
1031                                const char *src,
1032                                int dest_buffer_size)
1033 {
1034         int dest_length = strlen(dest);
1035         int src_length = strlen(src);
1036
1037         if (dest_length + src_length + 1 > dest_buffer_size) {
1038                 return false;
1039         }
1040
1041         memcpy(dest + dest_length, src, src_length + 1);
1042         return true;
1043 }
1044
1045 /**
1046  * Convert a names into a SID string, appending it to a buffer.
1047  *
1048  * @param ctx PAM winbind context.
1049  * @param user User in PAM request.
1050  * @param name Name to convert.
1051  * @param sid_list_buffer Where to append the string sid.
1052  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1053  *
1054  * @return false on failure, true on success.
1055  */
1056 static bool winbind_name_to_sid_string(struct pwb_context *ctx,
1057                                        const char *user,
1058                                        const char *name,
1059                                        char *sid_list_buffer,
1060                                        int sid_list_buffer_size)
1061 {
1062         char sid_string[WBC_SID_STRING_BUFLEN];
1063
1064         /* lookup name? */
1065         if (IS_SID_STRING(name)) {
1066                 strlcpy(sid_string, name, sizeof(sid_string));
1067         } else {
1068                 wbcErr wbc_status;
1069                 struct wbcDomainSid sid;
1070                 enum wbcSidType type;
1071
1072                 _pam_log_debug(ctx, LOG_DEBUG,
1073                                "no sid given, looking up: %s\n", name);
1074
1075                 wbc_status = wbcLookupName("", name, &sid, &type);
1076                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1077                         _pam_log(ctx, LOG_INFO,
1078                                  "could not lookup name: %s\n", name);
1079                         return false;
1080                 }
1081
1082                 wbcSidToStringBuf(&sid, sid_string, sizeof(sid_string));
1083         }
1084
1085         if (!safe_append_string(sid_list_buffer, sid_string,
1086                                 sid_list_buffer_size)) {
1087                 return false;
1088         }
1089         return true;
1090 }
1091
1092 /**
1093  * Convert a list of names into a list of sids.
1094  *
1095  * @param ctx PAM winbind context.
1096  * @param user User in PAM request.
1097  * @param name_list List of names or string sids, separated by commas.
1098  * @param sid_list_buffer Where to put the list of string sids.
1099  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1100  *
1101  * @return false on failure, true on success.
1102  */
1103 static bool winbind_name_list_to_sid_string_list(struct pwb_context *ctx,
1104                                                  const char *user,
1105                                                  const char *name_list,
1106                                                  char *sid_list_buffer,
1107                                                  int sid_list_buffer_size)
1108 {
1109         bool result = false;
1110         char *current_name = NULL;
1111         const char *search_location;
1112         const char *comma;
1113         int len;
1114
1115         if (sid_list_buffer_size > 0) {
1116                 sid_list_buffer[0] = 0;
1117         }
1118
1119         search_location = name_list;
1120         while ((comma = strchr(search_location, ',')) != NULL) {
1121                 current_name = strndup(search_location,
1122                                        comma - search_location);
1123                 if (NULL == current_name) {
1124                         goto out;
1125                 }
1126
1127                 if (!winbind_name_to_sid_string(ctx, user,
1128                                                 current_name,
1129                                                 sid_list_buffer,
1130                                                 sid_list_buffer_size)) {
1131                         /*
1132                          * If one group name failed, we must not fail
1133                          * the authentication totally, continue with
1134                          * the following group names. If user belongs to
1135                          * one of the valid groups, we must allow it
1136                          * login. -- BoYang
1137                          */
1138
1139                         _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1140                                  "check if group %s is valid group.", current_name,
1141                                  current_name);
1142                         _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1143                                         "to sid, please contact your administrator to see "
1144                                         "if group %s is valid."), current_name, current_name);
1145                         SAFE_FREE(current_name);
1146                         search_location = comma + 1;
1147                         continue;
1148                 }
1149
1150                 SAFE_FREE(current_name);
1151
1152                 if (!safe_append_string(sid_list_buffer, ",",
1153                                         sid_list_buffer_size)) {
1154                         goto out;
1155                 }
1156
1157                 search_location = comma + 1;
1158         }
1159
1160         if (!winbind_name_to_sid_string(ctx, user, search_location,
1161                                         sid_list_buffer,
1162                                         sid_list_buffer_size)) {
1163                 _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1164                          "check if group %s is valid group.", search_location,
1165                          search_location);
1166                 _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1167                                 "to sid, please contact your administrator to see "
1168                                 "if group %s is valid."), search_location, search_location);
1169
1170                 /* If no valid groups were converted we should fail outright */
1171                 if (name_list != NULL && strlen(sid_list_buffer) == 0) {
1172                         result = false;
1173                         goto out;
1174                 }
1175                 /*
1176                  * The lookup of the last name failed..
1177                  * It results in require_member_of_sid ends with ','
1178                  * It is malformated parameter here, overwrite the last ','.
1179                  */
1180                 len = strlen(sid_list_buffer);
1181                 if ((len != 0) && (sid_list_buffer[len - 1] == ',')) {
1182                         sid_list_buffer[len - 1] = '\0';
1183                 }
1184         }
1185
1186         result = true;
1187
1188 out:
1189         SAFE_FREE(current_name);
1190         return result;
1191 }
1192
1193 /**
1194  * put krb5ccname variable into environment
1195  *
1196  * @param ctx PAM winbind context.
1197  * @param krb5ccname env variable retrieved from winbindd.
1198  *
1199  * @return void.
1200  */
1201
1202 static void _pam_setup_krb5_env(struct pwb_context *ctx,
1203                                 struct wbcLogonUserInfo *info)
1204 {
1205         char *var = NULL;
1206         int ret;
1207         uint32_t i;
1208         const char *krb5ccname = NULL;
1209
1210         if (off(ctx->ctrl, WINBIND_KRB5_AUTH)) {
1211                 return;
1212         }
1213
1214         if (!info) {
1215                 return;
1216         }
1217
1218         for (i=0; i < info->num_blobs; i++) {
1219                 if (strcasecmp(info->blobs[i].name, "krb5ccname") == 0) {
1220                         krb5ccname = (const char *)info->blobs[i].blob.data;
1221                         break;
1222                 }
1223         }
1224
1225         if (!krb5ccname || (strlen(krb5ccname) == 0)) {
1226                 return;
1227         }
1228
1229         _pam_log_debug(ctx, LOG_DEBUG,
1230                        "request returned KRB5CCNAME: %s", krb5ccname);
1231
1232         if (asprintf(&var, "KRB5CCNAME=%s", krb5ccname) == -1) {
1233                 return;
1234         }
1235
1236         ret = pam_putenv(ctx->pamh, var);
1237         if (ret) {
1238                 _pam_log(ctx, LOG_ERR,
1239                          "failed to set KRB5CCNAME to %s: %s",
1240                          var, pam_strerror(ctx->pamh, ret));
1241         }
1242         free(var);
1243 }
1244
1245 /**
1246  * Copy unix username if available (further processed in PAM).
1247  *
1248  * @param ctx PAM winbind context
1249  * @param user_ret A pointer that holds a pointer to a string
1250  * @param unix_username A username
1251  *
1252  * @return void.
1253  */
1254
1255 static void _pam_setup_unix_username(struct pwb_context *ctx,
1256                                      char **user_ret,
1257                                      struct wbcLogonUserInfo *info)
1258 {
1259         const char *unix_username = NULL;
1260         uint32_t i;
1261
1262         if (!user_ret || !info) {
1263                 return;
1264         }
1265
1266         for (i=0; i < info->num_blobs; i++) {
1267                 if (strcasecmp(info->blobs[i].name, "unix_username") == 0) {
1268                         unix_username = (const char *)info->blobs[i].blob.data;
1269                         break;
1270                 }
1271         }
1272
1273         if (!unix_username || !unix_username[0]) {
1274                 return;
1275         }
1276
1277         *user_ret = strdup(unix_username);
1278 }
1279
1280 /**
1281  * Set string into the PAM stack.
1282  *
1283  * @param ctx PAM winbind context.
1284  * @param data_name Key name for pam_set_data.
1285  * @param value String value.
1286  *
1287  * @return void.
1288  */
1289
1290 static void _pam_set_data_string(struct pwb_context *ctx,
1291                                  const char *data_name,
1292                                  const char *value)
1293 {
1294         int ret;
1295
1296         if (!data_name || !value || (strlen(data_name) == 0) ||
1297              (strlen(value) == 0)) {
1298                 return;
1299         }
1300
1301         ret = pam_set_data(ctx->pamh, data_name, talloc_strdup(NULL, value),
1302                            _pam_winbind_cleanup_func);
1303         if (ret) {
1304                 _pam_log_debug(ctx, LOG_DEBUG,
1305                                "Could not set data %s: %s\n",
1306                                data_name, pam_strerror(ctx->pamh, ret));
1307         }
1308 }
1309
1310 /**
1311  * Set info3 strings into the PAM stack.
1312  *
1313  * @param ctx PAM winbind context.
1314  * @param data_name Key name for pam_set_data.
1315  * @param value String value.
1316  *
1317  * @return void.
1318  */
1319
1320 static void _pam_set_data_info3(struct pwb_context *ctx,
1321                                 const struct wbcAuthUserInfo *info)
1322 {
1323         _pam_set_data_string(ctx, PAM_WINBIND_HOMEDIR,
1324                              info->home_directory);
1325         _pam_set_data_string(ctx, PAM_WINBIND_LOGONSCRIPT,
1326                              info->logon_script);
1327         _pam_set_data_string(ctx, PAM_WINBIND_LOGONSERVER,
1328                              info->logon_server);
1329         _pam_set_data_string(ctx, PAM_WINBIND_PROFILEPATH,
1330                              info->profile_path);
1331 }
1332
1333 /**
1334  * Free info3 strings in the PAM stack.
1335  *
1336  * @param pamh PAM handle
1337  *
1338  * @return void.
1339  */
1340
1341 static void _pam_free_data_info3(pam_handle_t *pamh)
1342 {
1343         pam_set_data(pamh, PAM_WINBIND_HOMEDIR, NULL, NULL);
1344         pam_set_data(pamh, PAM_WINBIND_LOGONSCRIPT, NULL, NULL);
1345         pam_set_data(pamh, PAM_WINBIND_LOGONSERVER, NULL, NULL);
1346         pam_set_data(pamh, PAM_WINBIND_PROFILEPATH, NULL, NULL);
1347 }
1348
1349 /**
1350  * Send PAM_ERROR_MSG for cached or grace logons.
1351  *
1352  * @param ctx PAM winbind context.
1353  * @param username User in PAM request.
1354  * @param info3_user_flgs Info3 flags containing logon type bits.
1355  *
1356  * @return void.
1357  */
1358
1359 static void _pam_warn_logon_type(struct pwb_context *ctx,
1360                                  const char *username,
1361                                  uint32_t info3_user_flgs)
1362 {
1363         /* inform about logon type */
1364         if (PAM_WB_GRACE_LOGON(info3_user_flgs)) {
1365
1366                 _make_remark(ctx, PAM_ERROR_MSG,
1367                              _("Grace login. "
1368                                "Please change your password as soon you're "
1369                                "online again"));
1370                 _pam_log_debug(ctx, LOG_DEBUG,
1371                                "User %s logged on using grace logon\n",
1372                                username);
1373
1374         } else if (PAM_WB_CACHED_LOGON(info3_user_flgs)) {
1375
1376                 _make_remark(ctx, PAM_ERROR_MSG,
1377                              _("Domain Controller unreachable, "
1378                                "using cached credentials instead. "
1379                                "Network resources may be unavailable"));
1380                 _pam_log_debug(ctx, LOG_DEBUG,
1381                                "User %s logged on using cached credentials\n",
1382                                username);
1383         }
1384 }
1385
1386 /**
1387  * Send PAM_ERROR_MSG for krb5 errors.
1388  *
1389  * @param ctx PAM winbind context.
1390  * @param username User in PAM request.
1391  * @param info3_user_flgs Info3 flags containing logon type bits.
1392  *
1393  * @return void.
1394  */
1395
1396 static void _pam_warn_krb5_failure(struct pwb_context *ctx,
1397                                    const char *username,
1398                                    uint32_t info3_user_flgs)
1399 {
1400         if (PAM_WB_KRB5_CLOCK_SKEW(info3_user_flgs)) {
1401                 _make_remark(ctx, PAM_ERROR_MSG,
1402                              _("Failed to establish your Kerberos Ticket cache "
1403                                "due time differences\n"
1404                                "with the domain controller.  "
1405                                "Please verify the system time.\n"));
1406                 _pam_log_debug(ctx, LOG_DEBUG,
1407                                "User %s: Clock skew when getting Krb5 TGT\n",
1408                                username);
1409         }
1410 }
1411
1412 static bool _pam_check_remark_auth_err(struct pwb_context *ctx,
1413                                        const struct wbcAuthErrorInfo *e,
1414                                        const char *nt_status_string,
1415                                        int *pam_err)
1416 {
1417         const char *ntstatus = NULL;
1418         const char *error_string = NULL;
1419
1420         if (!e || !pam_err) {
1421                 return false;
1422         }
1423
1424         ntstatus = e->nt_string;
1425         if (!ntstatus) {
1426                 return false;
1427         }
1428
1429         if (strcasecmp(ntstatus, nt_status_string) == 0) {
1430
1431                 error_string = _get_ntstatus_error_string(nt_status_string);
1432                 if (error_string) {
1433                         _make_remark(ctx, PAM_ERROR_MSG, error_string);
1434                         *pam_err = e->pam_error;
1435                         return true;
1436                 }
1437
1438                 if (e->display_string) {
1439                         _make_remark(ctx, PAM_ERROR_MSG, _(e->display_string));
1440                         *pam_err = e->pam_error;
1441                         return true;
1442                 }
1443
1444                 _make_remark(ctx, PAM_ERROR_MSG, nt_status_string);
1445                 *pam_err = e->pam_error;
1446
1447                 return true;
1448         }
1449
1450         return false;
1451 };
1452
1453 /**
1454  * Compose Password Restriction String for a PAM_ERROR_MSG conversation.
1455  *
1456  * @param i The wbcUserPasswordPolicyInfo struct.
1457  *
1458  * @return string (caller needs to talloc_free).
1459  */
1460
1461 static char *_pam_compose_pwd_restriction_string(struct pwb_context *ctx,
1462                                                  struct wbcUserPasswordPolicyInfo *i)
1463 {
1464         char *str = NULL;
1465
1466         if (!i) {
1467                 goto failed;
1468         }
1469
1470         str = talloc_asprintf(ctx, _("Your password "));
1471         if (!str) {
1472                 goto failed;
1473         }
1474
1475         if (i->min_length_password > 0) {
1476                 str = talloc_asprintf_append(str,
1477                                _("must be at least %d characters; "),
1478                                i->min_length_password);
1479                 if (!str) {
1480                         goto failed;
1481                 }
1482         }
1483
1484         if (i->password_history > 0) {
1485                 str = talloc_asprintf_append(str,
1486                                _("cannot repeat any of your previous %d "
1487                                 "passwords; "),
1488                                i->password_history);
1489                 if (!str) {
1490                         goto failed;
1491                 }
1492         }
1493
1494         if (i->password_properties & WBC_DOMAIN_PASSWORD_COMPLEX) {
1495                 str = talloc_asprintf_append(str,
1496                                _("must contain capitals, numerals "
1497                                  "or punctuation; "
1498                                  "and cannot contain your account "
1499                                  "or full name; "));
1500                 if (!str) {
1501                         goto failed;
1502                 }
1503         }
1504
1505         str = talloc_asprintf_append(str,
1506                        _("Please type a different password. "
1507                          "Type a password which meets these requirements in "
1508                          "both text boxes."));
1509         if (!str) {
1510                 goto failed;
1511         }
1512
1513         return str;
1514
1515  failed:
1516         TALLOC_FREE(str);
1517         return NULL;
1518 }
1519
1520 static int _pam_create_homedir(struct pwb_context *ctx,
1521                                const char *dirname,
1522                                mode_t mode)
1523 {
1524         struct stat sbuf;
1525
1526         if (stat(dirname, &sbuf) == 0) {
1527                 return PAM_SUCCESS;
1528         }
1529
1530         if (mkdir(dirname, mode) != 0) {
1531
1532                 _make_remark_format(ctx, PAM_TEXT_INFO,
1533                                     _("Creating directory: %s failed: %s"),
1534                                     dirname, strerror(errno));
1535                 _pam_log(ctx, LOG_ERR, "could not create dir: %s (%s)",
1536                  dirname, strerror(errno));
1537                  return PAM_PERM_DENIED;
1538         }
1539
1540         return PAM_SUCCESS;
1541 }
1542
1543 static int _pam_chown_homedir(struct pwb_context *ctx,
1544                               const char *dirname,
1545                               uid_t uid,
1546                               gid_t gid)
1547 {
1548         if (chown(dirname, uid, gid) != 0) {
1549                 _pam_log(ctx, LOG_ERR, "failed to chown user homedir: %s (%s)",
1550                          dirname, strerror(errno));
1551                 return PAM_PERM_DENIED;
1552         }
1553
1554         return PAM_SUCCESS;
1555 }
1556
1557 static int _pam_mkhomedir(struct pwb_context *ctx)
1558 {
1559         struct passwd *pwd = NULL;
1560         char *token = NULL;
1561         char *create_dir = NULL;
1562         char *user_dir = NULL;
1563         int ret;
1564         const char *username;
1565         mode_t mode = 0700;
1566         char *safe_ptr = NULL;
1567         char *p = NULL;
1568
1569         /* Get the username */
1570         ret = pam_get_user(ctx->pamh, &username, NULL);
1571         if ((ret != PAM_SUCCESS) || (!username)) {
1572                 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1573                 return PAM_SERVICE_ERR;
1574         }
1575
1576         pwd = getpwnam(username);
1577         if (pwd == NULL) {
1578                 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1579                 return PAM_USER_UNKNOWN;
1580         }
1581         _pam_log_debug(ctx, LOG_DEBUG, "homedir is: %s", pwd->pw_dir);
1582
1583         ret = _pam_create_homedir(ctx, pwd->pw_dir, 0700);
1584         if (ret == PAM_SUCCESS) {
1585                 ret = _pam_chown_homedir(ctx, pwd->pw_dir,
1586                                          pwd->pw_uid,
1587                                          pwd->pw_gid);
1588         }
1589
1590         if (ret == PAM_SUCCESS) {
1591                 return ret;
1592         }
1593
1594         /* maybe we need to create parent dirs */
1595         create_dir = talloc_strdup(ctx, "/");
1596         if (!create_dir) {
1597                 return PAM_BUF_ERR;
1598         }
1599
1600         /* find final directory */
1601         user_dir = strrchr(pwd->pw_dir, '/');
1602         if (!user_dir) {
1603                 return PAM_BUF_ERR;
1604         }
1605         user_dir++;
1606
1607         _pam_log(ctx, LOG_DEBUG, "final directory: %s", user_dir);
1608
1609         p = pwd->pw_dir;
1610
1611         while ((token = strtok_r(p, "/", &safe_ptr)) != NULL) {
1612
1613                 mode = 0755;
1614
1615                 p = NULL;
1616
1617                 _pam_log_debug(ctx, LOG_DEBUG, "token is %s", token);
1618
1619                 create_dir = talloc_asprintf_append(create_dir, "%s/", token);
1620                 if (!create_dir) {
1621                         return PAM_BUF_ERR;
1622                 }
1623                 _pam_log_debug(ctx, LOG_DEBUG, "current_dir is %s", create_dir);
1624
1625                 if (strcmp(token, user_dir) == 0) {
1626                         _pam_log_debug(ctx, LOG_DEBUG, "assuming last directory: %s", token);
1627                         mode = 0700;
1628                 }
1629
1630                 ret = _pam_create_homedir(ctx, create_dir, mode);
1631                 if (ret) {
1632                         return ret;
1633                 }
1634         }
1635
1636         return _pam_chown_homedir(ctx, create_dir,
1637                                   pwd->pw_uid,
1638                                   pwd->pw_gid);
1639 }
1640
1641 /* talk to winbindd */
1642 static int winbind_auth_request(struct pwb_context *ctx,
1643                                 const char *user,
1644                                 const char *pass,
1645                                 const char *member,
1646                                 const char *cctype,
1647                                 const int warn_pwd_expire,
1648                                 struct wbcAuthErrorInfo **p_error,
1649                                 struct wbcLogonUserInfo **p_info,
1650                                 struct wbcUserPasswordPolicyInfo **p_policy,
1651                                 time_t *pwd_last_set,
1652                                 char **user_ret)
1653 {
1654         wbcErr wbc_status;
1655
1656         struct wbcLogonUserParams logon;
1657         char membership_of[1024];
1658         uid_t user_uid = -1;
1659         uint32_t flags = WBFLAG_PAM_INFO3_TEXT |
1660                          WBFLAG_PAM_GET_PWD_POLICY;
1661
1662         struct wbcLogonUserInfo *info = NULL;
1663         struct wbcAuthUserInfo *user_info = NULL;
1664         struct wbcAuthErrorInfo *error = NULL;
1665         struct wbcUserPasswordPolicyInfo *policy = NULL;
1666
1667         int ret = PAM_AUTH_ERR;
1668         int i;
1669         const char *codes[] = {
1670                 "NT_STATUS_PASSWORD_EXPIRED",
1671                 "NT_STATUS_PASSWORD_MUST_CHANGE",
1672                 "NT_STATUS_INVALID_WORKSTATION",
1673                 "NT_STATUS_INVALID_LOGON_HOURS",
1674                 "NT_STATUS_ACCOUNT_EXPIRED",
1675                 "NT_STATUS_ACCOUNT_DISABLED",
1676                 "NT_STATUS_ACCOUNT_LOCKED_OUT",
1677                 "NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
1678                 "NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
1679                 "NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
1680                 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1681                 "NT_STATUS_NO_LOGON_SERVERS",
1682                 "NT_STATUS_WRONG_PASSWORD",
1683                 "NT_STATUS_ACCESS_DENIED"
1684         };
1685
1686         if (pwd_last_set) {
1687                 *pwd_last_set = 0;
1688         }
1689
1690         /* Krb5 auth always has to go against the KDC of the user's realm */
1691
1692         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1693                 flags           |= WBFLAG_PAM_CONTACT_TRUSTDOM;
1694         }
1695
1696         if (ctx->ctrl & (WINBIND_KRB5_AUTH|WINBIND_CACHED_LOGIN)) {
1697                 struct passwd *pwd = NULL;
1698
1699                 pwd = getpwnam(user);
1700                 if (pwd == NULL) {
1701                         return PAM_USER_UNKNOWN;
1702                 }
1703                 user_uid        = pwd->pw_uid;
1704         }
1705
1706         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1707
1708                 _pam_log_debug(ctx, LOG_DEBUG,
1709                                "enabling krb5 login flag\n");
1710
1711                 flags           |= WBFLAG_PAM_KRB5 |
1712                                    WBFLAG_PAM_FALLBACK_AFTER_KRB5;
1713         }
1714
1715         if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1716                 _pam_log_debug(ctx, LOG_DEBUG,
1717                                "enabling cached login flag\n");
1718                 flags           |= WBFLAG_PAM_CACHED_LOGIN;
1719         }
1720
1721         if (user_ret) {
1722                 *user_ret = NULL;
1723                 flags           |= WBFLAG_PAM_UNIX_NAME;
1724         }
1725
1726         if (cctype != NULL) {
1727                 _pam_log_debug(ctx, LOG_DEBUG,
1728                                "enabling request for a %s krb5 ccache\n",
1729                                cctype);
1730         }
1731
1732         if (member != NULL) {
1733
1734                 ZERO_STRUCT(membership_of);
1735
1736                 if (!winbind_name_list_to_sid_string_list(ctx, user, member,
1737                                                           membership_of,
1738                                                           sizeof(membership_of))) {
1739                         _pam_log_debug(ctx, LOG_ERR,
1740                                        "failed to serialize membership of sid "
1741                                        "\"%s\"\n", member);
1742                         return PAM_AUTH_ERR;
1743                 }
1744         }
1745
1746         ZERO_STRUCT(logon);
1747
1748         logon.username                  = user;
1749         logon.password                  = pass;
1750
1751         if (cctype) {
1752                 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1753                                              &logon.blobs,
1754                                              "krb5_cc_type",
1755                                              0,
1756                                              discard_const_p(uint8_t, cctype),
1757                                              strlen(cctype)+1);
1758                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1759                         goto done;
1760                 }
1761         }
1762
1763         wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1764                                      &logon.blobs,
1765                                      "flags",
1766                                      0,
1767                                      (uint8_t *)&flags,
1768                                      sizeof(flags));
1769         if (!WBC_ERROR_IS_OK(wbc_status)) {
1770                 goto done;
1771         }
1772
1773         wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1774                                      &logon.blobs,
1775                                      "user_uid",
1776                                      0,
1777                                      (uint8_t *)&user_uid,
1778                                      sizeof(user_uid));
1779         if (!WBC_ERROR_IS_OK(wbc_status)) {
1780                 goto done;
1781         }
1782
1783         if (member) {
1784                 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1785                                              &logon.blobs,
1786                                              "membership_of",
1787                                              0,
1788                                              (uint8_t *)membership_of,
1789                                              sizeof(membership_of));
1790                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1791                         goto done;
1792                 }
1793         }
1794
1795         wbc_status = wbcLogonUser(&logon, &info, &error, &policy);
1796         ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1797                                           user, "wbcLogonUser");
1798         wbcFreeMemory(logon.blobs);
1799         logon.blobs = NULL;
1800
1801         if (info && info->info) {
1802                 user_info = info->info;
1803         }
1804
1805         if (pwd_last_set && user_info) {
1806                 *pwd_last_set = user_info->pass_last_set_time;
1807         }
1808
1809         if (p_info && info) {
1810                 *p_info = info;
1811         }
1812
1813         if (p_policy && policy) {
1814                 *p_policy = policy;
1815         }
1816
1817         if (p_error && error) {
1818                 /* We want to process the error in the caller. */
1819                 *p_error = error;
1820                 return ret;
1821         }
1822
1823         for (i=0; i<ARRAY_SIZE(codes); i++) {
1824                 int _ret = ret;
1825                 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1826                         ret = _ret;
1827                         goto done;
1828                 }
1829         }
1830
1831         if ((ret == PAM_SUCCESS) && user_info && policy && info) {
1832
1833                 bool already_expired = false;
1834                 bool change_pwd = false;
1835
1836                 /* warn a user if the password is about to expire soon */
1837                 _pam_warn_password_expiry(ctx, user_info, policy,
1838                                           warn_pwd_expire,
1839                                           &already_expired,
1840                                           &change_pwd);
1841
1842                 if (already_expired == true) {
1843
1844                         SMB_TIME_T last_set = user_info->pass_last_set_time;
1845
1846                         _pam_log_debug(ctx, LOG_DEBUG,
1847                                        "Password has expired "
1848                                        "(Password was last set: %lld, "
1849                                        "the policy says it should expire here "
1850                                        "%lld (now it's: %ld))\n",
1851                                        (long long int)last_set,
1852                                        (long long int)last_set +
1853                                        policy->expire,
1854                                        (long)time(NULL));
1855
1856                         return PAM_AUTHTOK_EXPIRED;
1857                 }
1858
1859                 if (change_pwd) {
1860                         ret = PAM_NEW_AUTHTOK_REQD;
1861                         goto done;
1862                 }
1863
1864                 /* inform about logon type */
1865                 _pam_warn_logon_type(ctx, user, user_info->user_flags);
1866
1867                 /* inform about krb5 failures */
1868                 _pam_warn_krb5_failure(ctx, user, user_info->user_flags);
1869
1870                 /* set some info3 info for other modules in the stack */
1871                 _pam_set_data_info3(ctx, user_info);
1872
1873                 /* put krb5ccname into env */
1874                 _pam_setup_krb5_env(ctx, info);
1875
1876                 /* If winbindd returned a username, return the pointer to it
1877                  * here. */
1878                 _pam_setup_unix_username(ctx, user_ret, info);
1879         }
1880
1881  done:
1882         wbcFreeMemory(logon.blobs);
1883         if (info && info->blobs && !p_info) {
1884                 wbcFreeMemory(info->blobs);
1885         }
1886         if (error && !p_error) {
1887                 wbcFreeMemory(error);
1888         }
1889         if (info && !p_info) {
1890                 wbcFreeMemory(info);
1891         }
1892         if (policy && !p_policy) {
1893                 wbcFreeMemory(policy);
1894         }
1895
1896         return ret;
1897 }
1898
1899 /* talk to winbindd */
1900 static int winbind_chauthtok_request(struct pwb_context *ctx,
1901                                      const char *user,
1902                                      const char *oldpass,
1903                                      const char *newpass,
1904                                      time_t pwd_last_set)
1905 {
1906         wbcErr wbc_status;
1907         struct wbcChangePasswordParams params;
1908         struct wbcAuthErrorInfo *error = NULL;
1909         struct wbcUserPasswordPolicyInfo *policy = NULL;
1910         enum wbcPasswordChangeRejectReason reject_reason = -1;
1911         uint32_t flags = 0;
1912
1913         int i;
1914         const char *codes[] = {
1915                 "NT_STATUS_BACKUP_CONTROLLER",
1916                 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1917                 "NT_STATUS_NO_LOGON_SERVERS",
1918                 "NT_STATUS_ACCESS_DENIED",
1919                 "NT_STATUS_PWD_TOO_SHORT", /* TODO: tell the min pwd length ? */
1920                 "NT_STATUS_PWD_TOO_RECENT", /* TODO: tell the minage ? */
1921                 "NT_STATUS_PWD_HISTORY_CONFLICT" /* TODO: tell the history length ? */
1922         };
1923         int ret = PAM_AUTH_ERR;
1924
1925         ZERO_STRUCT(params);
1926
1927         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1928                 flags |= WBFLAG_PAM_KRB5 |
1929                          WBFLAG_PAM_CONTACT_TRUSTDOM;
1930         }
1931
1932         if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1933                 flags |= WBFLAG_PAM_CACHED_LOGIN;
1934         }
1935
1936         params.account_name             = user;
1937         params.level                    = WBC_CHANGE_PASSWORD_LEVEL_PLAIN;
1938         params.old_password.plaintext   = oldpass;
1939         params.new_password.plaintext   = newpass;
1940         params.flags                    = flags;
1941
1942         wbc_status = wbcChangeUserPasswordEx(&params, &error, &reject_reason, &policy);
1943         ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1944                                           user, "wbcChangeUserPasswordEx");
1945
1946         if (WBC_ERROR_IS_OK(wbc_status)) {
1947                 _pam_log(ctx, LOG_NOTICE,
1948                          "user '%s' password changed", user);
1949                 return PAM_SUCCESS;
1950         }
1951
1952         if (!error) {
1953                 wbcFreeMemory(policy);
1954                 return ret;
1955         }
1956
1957         for (i=0; i<ARRAY_SIZE(codes); i++) {
1958                 int _ret = ret;
1959                 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1960                         ret = _ret;
1961                         goto done;
1962                 }
1963         }
1964
1965         if (!strcasecmp(error->nt_string,
1966                         "NT_STATUS_PASSWORD_RESTRICTION")) {
1967
1968                 char *pwd_restriction_string = NULL;
1969                 SMB_TIME_T min_pwd_age = 0;
1970
1971                 if (policy) {
1972                         min_pwd_age     = policy->min_passwordage;
1973                 }
1974
1975                 /* FIXME: avoid to send multiple PAM messages after another */
1976                 switch (reject_reason) {
1977                         case -1:
1978                                 break;
1979                         case WBC_PWD_CHANGE_NO_ERROR:
1980                                 if ((min_pwd_age > 0) &&
1981                                     (pwd_last_set + min_pwd_age > time(NULL))) {
1982                                         PAM_WB_REMARK_DIRECT(ctx,
1983                                              "NT_STATUS_PWD_TOO_RECENT");
1984                                 }
1985                                 break;
1986                         case WBC_PWD_CHANGE_PASSWORD_TOO_SHORT:
1987                                 PAM_WB_REMARK_DIRECT(ctx,
1988                                         "NT_STATUS_PWD_TOO_SHORT");
1989                                 break;
1990                         case WBC_PWD_CHANGE_PWD_IN_HISTORY:
1991                                 PAM_WB_REMARK_DIRECT(ctx,
1992                                         "NT_STATUS_PWD_HISTORY_CONFLICT");
1993                                 break;
1994                         case WBC_PWD_CHANGE_NOT_COMPLEX:
1995                                 _make_remark(ctx, PAM_ERROR_MSG,
1996                                              _("Password does not meet "
1997                                                "complexity requirements"));
1998                                 break;
1999                         default:
2000                                 _pam_log_debug(ctx, LOG_DEBUG,
2001                                                "unknown password change "
2002                                                "reject reason: %d",
2003                                                reject_reason);
2004                                 break;
2005                 }
2006
2007                 pwd_restriction_string =
2008                         _pam_compose_pwd_restriction_string(ctx, policy);
2009                 if (pwd_restriction_string) {
2010                         _make_remark(ctx, PAM_ERROR_MSG,
2011                                      pwd_restriction_string);
2012                         TALLOC_FREE(pwd_restriction_string);
2013                 }
2014         }
2015  done:
2016         wbcFreeMemory(error);
2017         wbcFreeMemory(policy);
2018
2019         return ret;
2020 }
2021
2022 /*
2023  * Checks if a user has an account
2024  *
2025  * return values:
2026  *       1  = User not found
2027  *       0  = OK
2028  *      -1  = System error
2029  */
2030 static int valid_user(struct pwb_context *ctx,
2031                       const char *user)
2032 {
2033         /* check not only if the user is available over NSS calls, also make
2034          * sure it's really a winbind user, this is important when stacking PAM
2035          * modules in the 'account' or 'password' facility. */
2036
2037         wbcErr wbc_status;
2038         struct passwd *pwd = NULL;
2039         struct passwd *wb_pwd = NULL;
2040
2041         pwd = getpwnam(user);
2042         if (pwd == NULL) {
2043                 return 1;
2044         }
2045
2046         wbc_status = wbcGetpwnam(user, &wb_pwd);
2047         wbcFreeMemory(wb_pwd);
2048         if (!WBC_ERROR_IS_OK(wbc_status)) {
2049                 _pam_log(ctx, LOG_DEBUG, "valid_user: wbcGetpwnam gave %s\n",
2050                         wbcErrorString(wbc_status));
2051         }
2052
2053         switch (wbc_status) {
2054                 case WBC_ERR_UNKNOWN_USER:
2055                 /* match other insane libwbclient return codes */
2056                 case WBC_ERR_WINBIND_NOT_AVAILABLE:
2057                 case WBC_ERR_DOMAIN_NOT_FOUND:
2058                         return 1;
2059                 case WBC_ERR_SUCCESS:
2060                         return 0;
2061                 default:
2062                         break;
2063         }
2064         return -1;
2065 }
2066
2067 static char *_pam_delete(register char *xx)
2068 {
2069         _pam_overwrite(xx);
2070         _pam_drop(xx);
2071         return NULL;
2072 }
2073
2074 /*
2075  * obtain a password from the user
2076  */
2077
2078 static int _winbind_read_password(struct pwb_context *ctx,
2079                                   unsigned int ctrl,
2080                                   const char *comment,
2081                                   const char *prompt1,
2082                                   const char *prompt2,
2083                                   const char **pass)
2084 {
2085         int authtok_flag;
2086         int retval;
2087         const char *item;
2088         char *token;
2089
2090         _pam_log(ctx, LOG_DEBUG, "getting password (0x%08x)", ctrl);
2091
2092         /*
2093          * make sure nothing inappropriate gets returned
2094          */
2095
2096         *pass = token = NULL;
2097
2098         /*
2099          * which authentication token are we getting?
2100          */
2101
2102         if (on(WINBIND__OLD_PASSWORD, ctrl)) {
2103                 authtok_flag = PAM_OLDAUTHTOK;
2104         } else {
2105                 authtok_flag = PAM_AUTHTOK;
2106         }
2107
2108         /*
2109          * should we obtain the password from a PAM item ?
2110          */
2111
2112         if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) ||
2113             on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2114                 retval = pam_get_item(ctx->pamh,
2115                                       authtok_flag,
2116                                       (const void **) &item);
2117                 if (retval != PAM_SUCCESS) {
2118                         /* very strange. */
2119                         _pam_log(ctx, LOG_ALERT,
2120                                  "pam_get_item returned error "
2121                                  "to unix-read-password");
2122                         return retval;
2123                 } else if (item != NULL) {      /* we have a password! */
2124                         *pass = item;
2125                         item = NULL;
2126                         _pam_log(ctx, LOG_DEBUG,
2127                                  "pam_get_item returned a password");
2128                         return PAM_SUCCESS;
2129                 } else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2130                         return PAM_AUTHTOK_RECOVER_ERR; /* didn't work */
2131                 } else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl)
2132                            && off(WINBIND__OLD_PASSWORD, ctrl)) {
2133                         return PAM_AUTHTOK_RECOVER_ERR;
2134                 }
2135         }
2136         /*
2137          * getting here implies we will have to get the password from the
2138          * user directly.
2139          */
2140
2141         {
2142                 struct pam_message msg[3], *pmsg[3];
2143                 struct pam_response *resp;
2144                 int i, replies;
2145
2146                 /* prepare to converse */
2147
2148                 if (comment != NULL && off(ctrl, WINBIND_SILENT)) {
2149                         pmsg[0] = &msg[0];
2150                         msg[0].msg_style = PAM_TEXT_INFO;
2151                         msg[0].msg = discard_const_p(char, comment);
2152                         i = 1;
2153                 } else {
2154                         i = 0;
2155                 }
2156
2157                 pmsg[i] = &msg[i];
2158                 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2159                 msg[i++].msg = discard_const_p(char, prompt1);
2160                 replies = 1;
2161
2162                 if (prompt2 != NULL) {
2163                         pmsg[i] = &msg[i];
2164                         msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2165                         msg[i++].msg = discard_const_p(char, prompt2);
2166                         ++replies;
2167                 }
2168                 /* so call the conversation expecting i responses */
2169                 resp = NULL;
2170                 retval = converse(ctx->pamh, i, pmsg, &resp);
2171                 if (resp == NULL) {
2172                         if (retval == PAM_SUCCESS) {
2173                                 retval = PAM_AUTHTOK_RECOVER_ERR;
2174                         }
2175                         goto done;
2176                 }
2177                 if (retval != PAM_SUCCESS) {
2178                         _pam_drop_reply(resp, i);
2179                         goto done;
2180                 }
2181
2182                 /* interpret the response */
2183
2184                 token = x_strdup(resp[i - replies].resp);
2185                 if (!token) {
2186                         _pam_log(ctx, LOG_NOTICE,
2187                                  "could not recover "
2188                                  "authentication token");
2189                         retval = PAM_AUTHTOK_RECOVER_ERR;
2190                         goto done;
2191                 }
2192
2193                 if (replies == 2) {
2194                         /* verify that password entered correctly */
2195                         if (!resp[i - 1].resp ||
2196                             strcmp(token, resp[i - 1].resp)) {
2197                                 _pam_delete(token);     /* mistyped */
2198                                 retval = PAM_AUTHTOK_RECOVER_ERR;
2199                                 _make_remark(ctx, PAM_ERROR_MSG,
2200                                              MISTYPED_PASS);
2201                         }
2202                 }
2203
2204                 /*
2205                  * tidy up the conversation (resp_retcode) is ignored
2206                  * -- what is it for anyway? AGM
2207                  */
2208                 _pam_drop_reply(resp, i);
2209         }
2210
2211  done:
2212         if (retval != PAM_SUCCESS) {
2213                 _pam_log_debug(ctx, LOG_DEBUG,
2214                                "unable to obtain a password");
2215                 return retval;
2216         }
2217         /* 'token' is the entered password */
2218
2219         /* we store this password as an item */
2220
2221         retval = pam_set_item(ctx->pamh, authtok_flag, token);
2222         _pam_delete(token);     /* clean it up */
2223         if (retval != PAM_SUCCESS ||
2224             (retval = pam_get_item(ctx->pamh, authtok_flag, (const void **) &item)) != PAM_SUCCESS) {
2225
2226                 _pam_log(ctx, LOG_CRIT, "error manipulating password");
2227                 return retval;
2228
2229         }
2230
2231         *pass = item;
2232         item = NULL;            /* break link to password */
2233
2234         return PAM_SUCCESS;
2235 }
2236
2237 static const char *get_conf_item_string(struct pwb_context *ctx,
2238                                         const char *item,
2239                                         int config_flag)
2240 {
2241         int i = 0;
2242         const char *parm_opt = NULL;
2243
2244         if (!(ctx->ctrl & config_flag)) {
2245                 goto out;
2246         }
2247
2248         /* let the pam opt take precedence over the pam_winbind.conf option */
2249         for (i=0; i<ctx->argc; i++) {
2250
2251                 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2252                         char *p;
2253
2254                         if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2255                                 _pam_log(ctx, LOG_INFO,
2256                                          "no \"=\" delimiter for \"%s\" found\n",
2257                                          item);
2258                                 goto out;
2259                         }
2260                         _pam_log_debug(ctx, LOG_INFO,
2261                                        "PAM config: %s '%s'\n", item, p+1);
2262                         return p + 1;
2263                 }
2264         }
2265
2266         if (ctx->dict) {
2267                 char *key = NULL;
2268
2269                 key = talloc_asprintf(ctx, "global:%s", item);
2270                 if (!key) {
2271                         goto out;
2272                 }
2273
2274                 parm_opt = iniparser_getstring(ctx->dict, key, NULL);
2275                 TALLOC_FREE(key);
2276
2277                 _pam_log_debug(ctx, LOG_INFO, "CONFIG file: %s '%s'\n",
2278                                item, parm_opt);
2279         }
2280 out:
2281         return parm_opt;
2282 }
2283
2284 static int get_config_item_int(struct pwb_context *ctx,
2285                                const char *item,
2286                                int config_flag)
2287 {
2288         int i, parm_opt = -1;
2289
2290         if (!(ctx->ctrl & config_flag)) {
2291                 goto out;
2292         }
2293
2294         /* let the pam opt take precedence over the pam_winbind.conf option */
2295         for (i = 0; i < ctx->argc; i++) {
2296
2297                 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2298                         char *p;
2299
2300                         if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2301                                 _pam_log(ctx, LOG_INFO,
2302                                          "no \"=\" delimiter for \"%s\" found\n",
2303                                          item);
2304                                 goto out;
2305                         }
2306                         parm_opt = atoi(p + 1);
2307                         _pam_log_debug(ctx, LOG_INFO,
2308                                        "PAM config: %s '%d'\n",
2309                                        item, parm_opt);
2310                         return parm_opt;
2311                 }
2312         }
2313
2314         if (ctx->dict) {
2315                 char *key = NULL;
2316
2317                 key = talloc_asprintf(ctx, "global:%s", item);
2318                 if (!key) {
2319                         goto out;
2320                 }
2321
2322                 parm_opt = iniparser_getint(ctx->dict, key, -1);
2323                 TALLOC_FREE(key);
2324
2325                 _pam_log_debug(ctx, LOG_INFO,
2326                                "CONFIG file: %s '%d'\n",
2327                                item, parm_opt);
2328         }
2329 out:
2330         return parm_opt;
2331 }
2332
2333 static const char *get_krb5_cc_type_from_config(struct pwb_context *ctx)
2334 {
2335         return get_conf_item_string(ctx, "krb5_ccache_type",
2336                                     WINBIND_KRB5_CCACHE_TYPE);
2337 }
2338
2339 static const char *get_member_from_config(struct pwb_context *ctx)
2340 {
2341         const char *ret = NULL;
2342         ret = get_conf_item_string(ctx, "require_membership_of",
2343                                    WINBIND_REQUIRED_MEMBERSHIP);
2344         if (ret) {
2345                 return ret;
2346         }
2347         return get_conf_item_string(ctx, "require-membership-of",
2348                                     WINBIND_REQUIRED_MEMBERSHIP);
2349 }
2350
2351 static int get_warn_pwd_expire_from_config(struct pwb_context *ctx)
2352 {
2353         int ret;
2354         ret = get_config_item_int(ctx, "warn_pwd_expire",
2355                                   WINBIND_WARN_PWD_EXPIRE);
2356         /* no or broken setting */
2357         if (ret < 0) {
2358                 return DEFAULT_DAYS_TO_WARN_BEFORE_PWD_EXPIRES;
2359         }
2360         return ret;
2361 }
2362
2363 /**
2364  * Retrieve the winbind separator.
2365  *
2366  * @param ctx PAM winbind context.
2367  *
2368  * @return string separator character. NULL on failure.
2369  */
2370
2371 static char winbind_get_separator(struct pwb_context *ctx)
2372 {
2373         wbcErr wbc_status;
2374         static struct wbcInterfaceDetails *details = NULL;
2375
2376         wbc_status = wbcInterfaceDetails(&details);
2377         if (!WBC_ERROR_IS_OK(wbc_status)) {
2378                 _pam_log(ctx, LOG_ERR,
2379                          "Could not retrieve winbind interface details: %s",
2380                          wbcErrorString(wbc_status));
2381                 return '\0';
2382         }
2383
2384         if (!details) {
2385                 return '\0';
2386         }
2387
2388         return details->winbind_separator;
2389 }
2390
2391
2392 /**
2393  * Convert a upn to a name.
2394  *
2395  * @param ctx PAM winbind context.
2396  * @param upn  USer UPN to be trabslated.
2397  *
2398  * @return converted name. NULL pointer on failure. Caller needs to free.
2399  */
2400
2401 static char* winbind_upn_to_username(struct pwb_context *ctx,
2402                                      const char *upn)
2403 {
2404         char sep;
2405         wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;
2406         struct wbcDomainSid sid;
2407         enum wbcSidType type;
2408         char *domain = NULL;
2409         char *name;
2410         char *p;
2411
2412         /* This cannot work when the winbind separator = @ */
2413
2414         sep = winbind_get_separator(ctx);
2415         if (!sep || sep == '@') {
2416                 return NULL;
2417         }
2418
2419         name = talloc_strdup(ctx, upn);
2420         if (!name) {
2421                 return NULL;
2422         }
2423         if ((p = strchr(name, '@')) != NULL) {
2424                 *p = 0;
2425                 domain = p + 1;
2426         }
2427
2428         /* Convert the UPN to a SID */
2429
2430         wbc_status = wbcLookupName(domain, name, &sid, &type);
2431         if (!WBC_ERROR_IS_OK(wbc_status)) {
2432                 return NULL;
2433         }
2434
2435         /* Convert the the SID back to the sAMAccountName */
2436
2437         wbc_status = wbcLookupSid(&sid, &domain, &name, &type);
2438         if (!WBC_ERROR_IS_OK(wbc_status)) {
2439                 return NULL;
2440         }
2441
2442         return talloc_asprintf(ctx, "%s%c%s", domain, sep, name);
2443 }
2444
2445 static int _pam_delete_cred(pam_handle_t *pamh, int flags,
2446                          int argc, const char **argv)
2447 {
2448         int retval = PAM_SUCCESS;
2449         struct pwb_context *ctx = NULL;
2450         struct wbcLogoffUserParams logoff;
2451         struct wbcAuthErrorInfo *error = NULL;
2452         const char *user;
2453         wbcErr wbc_status = WBC_ERR_SUCCESS;
2454
2455         ZERO_STRUCT(logoff);
2456
2457         retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2458         if (retval) {
2459                 goto out;
2460         }
2461
2462         _PAM_LOG_FUNCTION_ENTER("_pam_delete_cred", ctx);
2463
2464         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
2465
2466                 /* destroy the ccache here */
2467
2468                 uint32_t wbc_flags = 0;
2469                 const char *ccname = NULL;
2470                 struct passwd *pwd = NULL;
2471
2472                 retval = pam_get_user(pamh, &user, _("Username: "));
2473                 if (retval) {
2474                         _pam_log(ctx, LOG_ERR,
2475                                  "could not identify user");
2476                         goto out;
2477                 }
2478
2479                 if (user == NULL) {
2480                         _pam_log(ctx, LOG_ERR,
2481                                  "username was NULL!");
2482                         retval = PAM_USER_UNKNOWN;
2483                         goto out;
2484                 }
2485
2486                 _pam_log_debug(ctx, LOG_DEBUG,
2487                                "username [%s] obtained", user);
2488
2489                 ccname = pam_getenv(pamh, "KRB5CCNAME");
2490                 if (ccname == NULL) {
2491                         _pam_log_debug(ctx, LOG_DEBUG,
2492                                        "user has no KRB5CCNAME environment");
2493                 }
2494
2495                 pwd = getpwnam(user);
2496                 if (pwd == NULL) {
2497                         retval = PAM_USER_UNKNOWN;
2498                         goto out;
2499                 }
2500
2501                 wbc_flags = WBFLAG_PAM_KRB5 |
2502                         WBFLAG_PAM_CONTACT_TRUSTDOM;
2503
2504                 logoff.username         = user;
2505
2506                 if (ccname) {
2507                         wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2508                                                      &logoff.blobs,
2509                                                      "ccfilename",
2510                                                      0,
2511                                                      discard_const_p(uint8_t, ccname),
2512                                                      strlen(ccname)+1);
2513                         if (!WBC_ERROR_IS_OK(wbc_status)) {
2514                                 goto out;
2515                         }
2516                 }
2517
2518                 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2519                                              &logoff.blobs,
2520                                              "flags",
2521                                              0,
2522                                              (uint8_t *)&wbc_flags,
2523                                              sizeof(wbc_flags));
2524                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2525                         goto out;
2526                 }
2527
2528                 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2529                                              &logoff.blobs,
2530                                              "user_uid",
2531                                              0,
2532                                              (uint8_t *)&pwd->pw_uid,
2533                                              sizeof(pwd->pw_uid));
2534                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2535                         goto out;
2536                 }
2537
2538                 wbc_status = wbcLogoffUserEx(&logoff, &error);
2539                 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2540                                                      user, "wbcLogoffUser");
2541                 wbcFreeMemory(error);
2542                 wbcFreeMemory(logoff.blobs);
2543                 logoff.blobs = NULL;
2544
2545                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2546                         _pam_log(ctx, LOG_INFO,
2547                                  "failed to logoff user %s: %s\n",
2548                                          user, wbcErrorString(wbc_status));
2549                 }
2550         }
2551
2552 out:
2553         if (logoff.blobs) {
2554                 wbcFreeMemory(logoff.blobs);
2555         }
2556
2557         if (!WBC_ERROR_IS_OK(wbc_status)) {
2558                 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2559                      user, "wbcLogoffUser");
2560         }
2561
2562         /*
2563          * Delete the krb5 ccname variable from the PAM environment
2564          * if it was set by winbind.
2565          */
2566         if ((ctx->ctrl & WINBIND_KRB5_AUTH) && pam_getenv(pamh, "KRB5CCNAME")) {
2567                 pam_putenv(pamh, "KRB5CCNAME");
2568         }
2569
2570         _PAM_LOG_FUNCTION_LEAVE("_pam_delete_cred", ctx, retval);
2571
2572         TALLOC_FREE(ctx);
2573
2574         return retval;
2575 }
2576
2577 PAM_EXTERN
2578 int pam_sm_authenticate(pam_handle_t *pamh, int flags,
2579                         int argc, const char **argv)
2580 {
2581         const char *username;
2582         const char *password;
2583         const char *member = NULL;
2584         const char *cctype = NULL;
2585         int warn_pwd_expire;
2586         int retval = PAM_AUTH_ERR;
2587         char *username_ret = NULL;
2588         char *new_authtok_required = NULL;
2589         char *real_username = NULL;
2590         struct pwb_context *ctx = NULL;
2591
2592         retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2593         if (retval) {
2594                 goto out;
2595         }
2596
2597         _PAM_LOG_FUNCTION_ENTER("pam_sm_authenticate", ctx);
2598
2599         /* Get the username */
2600         retval = pam_get_user(pamh, &username, NULL);
2601         if ((retval != PAM_SUCCESS) || (!username)) {
2602                 _pam_log_debug(ctx, LOG_DEBUG,
2603                                "can not get the username");
2604                 retval = PAM_SERVICE_ERR;
2605                 goto out;
2606         }
2607
2608
2609 #if defined(AIX)
2610         /* Decode the user name since AIX does not support logn user
2611            names by default.  The name is encoded as _#uid.  */
2612
2613         if (username[0] == '_') {
2614                 uid_t id = atoi(&username[1]);
2615                 struct passwd *pw = NULL;
2616
2617                 if ((id!=0) && ((pw = getpwuid(id)) != NULL)) {
2618                         real_username = strdup(pw->pw_name);
2619                 }
2620         }
2621 #endif
2622
2623         if (!real_username) {
2624                 /* Just making a copy of the username we got from PAM */
2625                 if ((real_username = strdup(username)) == NULL) {
2626                         _pam_log_debug(ctx, LOG_DEBUG,
2627                                        "memory allocation failure when copying "
2628                                        "username");
2629                         retval = PAM_SERVICE_ERR;
2630                         goto out;
2631                 }
2632         }
2633
2634         /* Maybe this was a UPN */
2635
2636         if (strchr(real_username, '@') != NULL) {
2637                 char *samaccountname = NULL;
2638
2639                 samaccountname = winbind_upn_to_username(ctx,
2640                                                          real_username);
2641                 if (samaccountname) {
2642                         free(real_username);
2643                         real_username = strdup(samaccountname);
2644                 }
2645         }
2646
2647         retval = _winbind_read_password(ctx, ctx->ctrl, NULL,
2648                                         _("Password: "), NULL,
2649                                         &password);
2650
2651         if (retval != PAM_SUCCESS) {
2652                 _pam_log(ctx, LOG_ERR,
2653                          "Could not retrieve user's password");
2654                 retval = PAM_AUTHTOK_ERR;
2655                 goto out;
2656         }
2657
2658         /* Let's not give too much away in the log file */
2659
2660 #ifdef DEBUG_PASSWORD
2661         _pam_log_debug(ctx, LOG_INFO,
2662                        "Verify user '%s' with password '%s'",
2663                        real_username, password);
2664 #else
2665         _pam_log_debug(ctx, LOG_INFO,
2666                        "Verify user '%s'", real_username);
2667 #endif
2668
2669         member = get_member_from_config(ctx);
2670         cctype = get_krb5_cc_type_from_config(ctx);
2671         warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
2672
2673         /* Now use the username to look up password */
2674         retval = winbind_auth_request(ctx, real_username, password,
2675                                       member, cctype, warn_pwd_expire,
2676                                       NULL, NULL, NULL,
2677                                       NULL, &username_ret);
2678
2679         if (retval == PAM_NEW_AUTHTOK_REQD ||
2680             retval == PAM_AUTHTOK_EXPIRED) {
2681
2682                 char *new_authtok_required_during_auth = NULL;
2683
2684                 new_authtok_required = talloc_asprintf(NULL, "%d", retval);
2685                 if (!new_authtok_required) {
2686                         retval = PAM_BUF_ERR;
2687                         goto out;
2688                 }
2689
2690                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2691                              new_authtok_required,
2692                              _pam_winbind_cleanup_func);
2693
2694                 retval = PAM_SUCCESS;
2695
2696                 new_authtok_required_during_auth = talloc_asprintf(NULL, "%d", true);
2697                 if (!new_authtok_required_during_auth) {
2698                         retval = PAM_BUF_ERR;
2699                         goto out;
2700                 }
2701
2702                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2703                              new_authtok_required_during_auth,
2704                              _pam_winbind_cleanup_func);
2705
2706                 goto out;
2707         }
2708
2709 out:
2710         if (username_ret) {
2711                 pam_set_item (pamh, PAM_USER, username_ret);
2712                 _pam_log_debug(ctx, LOG_INFO,
2713                                "Returned user was '%s'", username_ret);
2714                 free(username_ret);
2715         }
2716
2717         if (real_username) {
2718                 free(real_username);
2719         }
2720
2721         if (!new_authtok_required) {
2722                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, NULL, NULL);
2723         }
2724
2725         if (retval != PAM_SUCCESS) {
2726                 _pam_free_data_info3(pamh);
2727         }
2728
2729         if (ctx != NULL) {
2730                 _PAM_LOG_FUNCTION_LEAVE("pam_sm_authenticate", ctx, retval);
2731                 TALLOC_FREE(ctx);
2732         }
2733
2734         return retval;
2735 }
2736
2737 PAM_EXTERN
2738 int pam_sm_setcred(pam_handle_t *pamh, int flags,
2739                    int argc, const char **argv)
2740 {
2741         int ret = PAM_SYSTEM_ERR;
2742         struct pwb_context *ctx = NULL;
2743
2744         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2745         if (ret) {
2746                 goto out;
2747         }
2748
2749         _PAM_LOG_FUNCTION_ENTER("pam_sm_setcred", ctx);
2750
2751         switch (flags & ~PAM_SILENT) {
2752
2753                 case PAM_DELETE_CRED:
2754                         ret = _pam_delete_cred(pamh, flags, argc, argv);
2755                         break;
2756                 case PAM_REFRESH_CRED:
2757                         _pam_log_debug(ctx, LOG_WARNING,
2758                                        "PAM_REFRESH_CRED not implemented");
2759                         ret = PAM_SUCCESS;
2760                         break;
2761                 case PAM_REINITIALIZE_CRED:
2762                         _pam_log_debug(ctx, LOG_WARNING,
2763                                        "PAM_REINITIALIZE_CRED not implemented");
2764                         ret = PAM_SUCCESS;
2765                         break;
2766                 case PAM_ESTABLISH_CRED:
2767                         _pam_log_debug(ctx, LOG_WARNING,
2768                                        "PAM_ESTABLISH_CRED not implemented");
2769                         ret = PAM_SUCCESS;
2770                         break;
2771                 default:
2772                         ret = PAM_SYSTEM_ERR;
2773                         break;
2774         }
2775
2776  out:
2777
2778         _PAM_LOG_FUNCTION_LEAVE("pam_sm_setcred", ctx, ret);
2779
2780         TALLOC_FREE(ctx);
2781
2782         return ret;
2783 }
2784
2785 /*
2786  * Account management. We want to verify that the account exists
2787  * before returning PAM_SUCCESS
2788  */
2789 PAM_EXTERN
2790 int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
2791                    int argc, const char **argv)
2792 {
2793         const char *username;
2794         int ret = PAM_USER_UNKNOWN;
2795         const char *tmp = NULL;
2796         struct pwb_context *ctx = NULL;
2797
2798         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2799         if (ret) {
2800                 goto out;
2801         }
2802
2803         _PAM_LOG_FUNCTION_ENTER("pam_sm_acct_mgmt", ctx);
2804
2805
2806         /* Get the username */
2807         ret = pam_get_user(pamh, &username, NULL);
2808         if ((ret != PAM_SUCCESS) || (!username)) {
2809                 _pam_log_debug(ctx, LOG_DEBUG,
2810                                "can not get the username");
2811                 ret = PAM_SERVICE_ERR;
2812                 goto out;
2813         }
2814
2815         /* Verify the username */
2816         ret = valid_user(ctx, username);
2817         switch (ret) {
2818         case -1:
2819                 /* some sort of system error. The log was already printed */
2820                 ret = PAM_SERVICE_ERR;
2821                 goto out;
2822         case 1:
2823                 /* the user does not exist */
2824                 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
2825                                username);
2826                 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
2827                         ret = PAM_IGNORE;
2828                         goto out;
2829                 }
2830                 ret = PAM_USER_UNKNOWN;
2831                 goto out;
2832         case 0:
2833                 pam_get_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2834                              (const void **)&tmp);
2835                 if (tmp != NULL) {
2836                         ret = atoi(tmp);
2837                         switch (ret) {
2838                         case PAM_AUTHTOK_EXPIRED:
2839                                 /* fall through, since new token is required in this case */
2840                         case PAM_NEW_AUTHTOK_REQD:
2841                                 _pam_log(ctx, LOG_WARNING,
2842                                          "pam_sm_acct_mgmt success but %s is set",
2843                                          PAM_WINBIND_NEW_AUTHTOK_REQD);
2844                                 _pam_log(ctx, LOG_NOTICE,
2845                                          "user '%s' needs new password",
2846                                          username);
2847                                 /* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */
2848                                 ret = PAM_NEW_AUTHTOK_REQD;
2849                                 goto out;
2850                         default:
2851                                 _pam_log(ctx, LOG_WARNING,
2852                                          "pam_sm_acct_mgmt success");
2853                                 _pam_log(ctx, LOG_NOTICE,
2854                                          "user '%s' granted access", username);
2855                                 ret = PAM_SUCCESS;
2856                                 goto out;
2857                         }
2858                 }
2859
2860                 /* Otherwise, the authentication looked good */
2861                 _pam_log(ctx, LOG_NOTICE,
2862                          "user '%s' granted access", username);
2863                 ret = PAM_SUCCESS;
2864                 goto out;
2865         default:
2866                 /* we don't know anything about this return value */
2867                 _pam_log(ctx, LOG_ERR,
2868                          "internal module error (ret = %d, user = '%s')",
2869                          ret, username);
2870                 ret = PAM_SERVICE_ERR;
2871                 goto out;
2872         }
2873
2874         /* should not be reached */
2875         ret = PAM_IGNORE;
2876
2877  out:
2878
2879         _PAM_LOG_FUNCTION_LEAVE("pam_sm_acct_mgmt", ctx, ret);
2880
2881         TALLOC_FREE(ctx);
2882
2883         return ret;
2884 }
2885
2886 PAM_EXTERN
2887 int pam_sm_open_session(pam_handle_t *pamh, int flags,
2888                         int argc, const char **argv)
2889 {
2890         int ret = PAM_SUCCESS;
2891         struct pwb_context *ctx = NULL;
2892
2893         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2894         if (ret) {
2895                 goto out;
2896         }
2897
2898         _PAM_LOG_FUNCTION_ENTER("pam_sm_open_session", ctx);
2899
2900         if (ctx->ctrl & WINBIND_MKHOMEDIR) {
2901                 /* check and create homedir */
2902                 ret = _pam_mkhomedir(ctx);
2903         }
2904  out:
2905         _PAM_LOG_FUNCTION_LEAVE("pam_sm_open_session", ctx, ret);
2906
2907         TALLOC_FREE(ctx);
2908
2909         return ret;
2910 }
2911
2912 PAM_EXTERN
2913 int pam_sm_close_session(pam_handle_t *pamh, int flags,
2914                          int argc, const char **argv)
2915 {
2916         int ret = PAM_SUCCESS;
2917         struct pwb_context *ctx = NULL;
2918
2919         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2920         if (ret) {
2921                 goto out;
2922         }
2923
2924         _PAM_LOG_FUNCTION_ENTER("pam_sm_close_session", ctx);
2925
2926 out:
2927         _PAM_LOG_FUNCTION_LEAVE("pam_sm_close_session", ctx, ret);
2928
2929         TALLOC_FREE(ctx);
2930
2931         return ret;
2932 }
2933
2934 /**
2935  * evaluate whether we need to re-authenticate with kerberos after a
2936  * password change
2937  *
2938  * @param ctx PAM winbind context.
2939  * @param user The username
2940  *
2941  * @return boolean Returns true if required, false if not.
2942  */
2943
2944 static bool _pam_require_krb5_auth_after_chauthtok(struct pwb_context *ctx,
2945                                                    const char *user)
2946 {
2947
2948         /* Make sure that we only do this if a) the chauthtok got initiated
2949          * during a logon attempt (authenticate->acct_mgmt->chauthtok) b) any
2950          * later password change via the "passwd" command if done by the user
2951          * itself
2952          * NB. If we login from gdm or xdm and the password expires,
2953          * we change the password, but there is no memory cache.
2954          * Thus, even for passthrough login, we should do the
2955          * authentication again to update memory cache.
2956          * --- BoYang
2957          * */
2958
2959         char *new_authtok_reqd_during_auth = NULL;
2960         struct passwd *pwd = NULL;
2961
2962         pam_get_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2963                       (const void **) &new_authtok_reqd_during_auth);
2964         pam_set_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2965                      NULL, NULL);
2966
2967         if (new_authtok_reqd_during_auth) {
2968                 return true;
2969         }
2970
2971         pwd = getpwnam(user);
2972         if (!pwd) {
2973                 return false;
2974         }
2975
2976         if (getuid() == pwd->pw_uid) {
2977                 return true;
2978         }
2979
2980         return false;
2981 }
2982
2983
2984 PAM_EXTERN
2985 int pam_sm_chauthtok(pam_handle_t * pamh, int flags,
2986                      int argc, const char **argv)
2987 {
2988         unsigned int lctrl;
2989         int ret;
2990         bool cached_login = false;
2991
2992         /* <DO NOT free() THESE> */
2993         const char *user;
2994         const char *pass_old;
2995         const char *pass_new;
2996         /* </DO NOT free() THESE> */
2997
2998         char *Announce;
2999
3000         int retry = 0;
3001         char *username_ret = NULL;
3002         struct wbcAuthErrorInfo *error = NULL;
3003         struct pwb_context *ctx = NULL;
3004
3005         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
3006         if (ret) {
3007                 goto out;
3008         }
3009
3010         _PAM_LOG_FUNCTION_ENTER("pam_sm_chauthtok", ctx);
3011
3012         cached_login = (ctx->ctrl & WINBIND_CACHED_LOGIN);
3013
3014         /* clearing offline bit for auth */
3015         ctx->ctrl &= ~WINBIND_CACHED_LOGIN;
3016
3017         /*
3018          * First get the name of a user
3019          */
3020         ret = pam_get_user(pamh, &user, _("Username: "));
3021         if (ret) {
3022                 _pam_log(ctx, LOG_ERR,
3023                          "password - could not identify user");
3024                 goto out;
3025         }
3026
3027         if (user == NULL) {
3028                 _pam_log(ctx, LOG_ERR, "username was NULL!");
3029                 ret = PAM_USER_UNKNOWN;
3030                 goto out;
3031         }
3032
3033         _pam_log_debug(ctx, LOG_DEBUG, "username [%s] obtained", user);
3034
3035         /* check if this is really a user in winbindd, not only in NSS */
3036         ret = valid_user(ctx, user);
3037         switch (ret) {
3038                 case 1:
3039                         ret = PAM_USER_UNKNOWN;
3040                         goto out;
3041                 case -1:
3042                         ret = PAM_SYSTEM_ERR;
3043                         goto out;
3044                 default:
3045                         break;
3046         }
3047
3048         /*
3049          * obtain and verify the current password (OLDAUTHTOK) for
3050          * the user.
3051          */
3052
3053         if (flags & PAM_PRELIM_CHECK) {
3054                 time_t pwdlastset_prelim = 0;
3055
3056                 /* instruct user what is happening */
3057
3058 #define greeting _("Changing password for")
3059                 Announce = talloc_asprintf(ctx, "%s %s", greeting, user);
3060                 if (!Announce) {
3061                         _pam_log(ctx, LOG_CRIT,
3062                                  "password - out of memory");
3063                         ret = PAM_BUF_ERR;
3064                         goto out;
3065                 }
3066 #undef greeting
3067
3068                 lctrl = ctx->ctrl | WINBIND__OLD_PASSWORD;
3069                 ret = _winbind_read_password(ctx, lctrl,
3070                                                 Announce,
3071                                                 _("(current) NT password: "),
3072                                                 NULL,
3073                                                 (const char **) &pass_old);
3074                 TALLOC_FREE(Announce);
3075                 if (ret != PAM_SUCCESS) {
3076                         _pam_log(ctx, LOG_NOTICE,
3077                                  "password - (old) token not obtained");
3078                         goto out;
3079                 }
3080
3081                 /* verify that this is the password for this user */
3082
3083                 ret = winbind_auth_request(ctx, user, pass_old,
3084                                            NULL, NULL, 0,
3085                                            &error, NULL, NULL,
3086                                            &pwdlastset_prelim, NULL);
3087
3088                 if (ret != PAM_ACCT_EXPIRED &&
3089                     ret != PAM_AUTHTOK_EXPIRED &&
3090                     ret != PAM_NEW_AUTHTOK_REQD &&
3091                     ret != PAM_SUCCESS) {
3092                         pass_old = NULL;
3093                         goto out;
3094                 }
3095
3096                 pam_set_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3097                              (void *)pwdlastset_prelim, NULL);
3098
3099                 ret = pam_set_item(pamh, PAM_OLDAUTHTOK,
3100                                    (const void *) pass_old);
3101                 pass_old = NULL;
3102                 if (ret != PAM_SUCCESS) {
3103                         _pam_log(ctx, LOG_CRIT,
3104                                  "failed to set PAM_OLDAUTHTOK");
3105                 }
3106         } else if (flags & PAM_UPDATE_AUTHTOK) {
3107
3108                 time_t pwdlastset_update = 0;
3109
3110                 /*
3111                  * obtain the proposed password
3112                  */
3113
3114                 /*
3115                  * get the old token back.
3116                  */
3117
3118                 ret = pam_get_item(pamh, PAM_OLDAUTHTOK, (const void **) &pass_old);
3119
3120                 if (ret != PAM_SUCCESS) {
3121                         _pam_log(ctx, LOG_NOTICE,
3122                                  "user not authenticated");
3123                         goto out;
3124                 }
3125
3126                 lctrl = ctx->ctrl & ~WINBIND_TRY_FIRST_PASS_ARG;
3127
3128                 if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) {
3129                         lctrl |= WINBIND_USE_FIRST_PASS_ARG;
3130                 }
3131                 retry = 0;
3132                 ret = PAM_AUTHTOK_ERR;
3133                 while ((ret != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) {
3134                         /*
3135                          * use_authtok is to force the use of a previously entered
3136                          * password -- needed for pluggable password strength checking
3137                          */
3138
3139                         ret = _winbind_read_password(ctx, lctrl,
3140                                                      NULL,
3141                                                      _("Enter new NT password: "),
3142                                                      _("Retype new NT password: "),
3143                                                      (const char **)&pass_new);
3144
3145                         if (ret != PAM_SUCCESS) {
3146                                 _pam_log_debug(ctx, LOG_ALERT,
3147                                                "password - "
3148                                                "new password not obtained");
3149                                 pass_old = NULL;/* tidy up */
3150                                 goto out;
3151                         }
3152
3153                         /*
3154                          * At this point we know who the user is and what they
3155                          * propose as their new password. Verify that the new
3156                          * password is acceptable.
3157                          */
3158
3159                         if (pass_new[0] == '\0') {/* "\0" password = NULL */
3160                                 pass_new = NULL;
3161                         }
3162                 }
3163
3164                 /*
3165                  * By reaching here we have approved the passwords and must now
3166                  * rebuild the password database file.
3167                  */
3168                 pam_get_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3169                              (const void **) &pwdlastset_update);
3170
3171                 /*
3172                  * if cached creds were enabled, make sure to set the
3173                  * WINBIND_CACHED_LOGIN bit here in order to have winbindd
3174                  * update the cached creds storage - gd
3175                  */
3176                 if (cached_login) {
3177                         ctx->ctrl |= WINBIND_CACHED_LOGIN;
3178                 }
3179
3180                 ret = winbind_chauthtok_request(ctx, user, pass_old,
3181                                                 pass_new, pwdlastset_update);
3182                 if (ret) {
3183                         pass_old = pass_new = NULL;
3184                         goto out;
3185                 }
3186
3187                 if (_pam_require_krb5_auth_after_chauthtok(ctx, user)) {
3188
3189                         const char *member = NULL;
3190                         const char *cctype = NULL;
3191                         int warn_pwd_expire;
3192                         struct wbcLogonUserInfo *info = NULL;
3193                         struct wbcUserPasswordPolicyInfo *policy = NULL;
3194
3195                         member = get_member_from_config(ctx);
3196                         cctype = get_krb5_cc_type_from_config(ctx);
3197                         warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
3198
3199                         /* Keep WINBIND_CACHED_LOGIN bit for
3200                          * authentication after changing the password.
3201                          * This will update the cached credentials in case
3202                          * that winbindd_dual_pam_chauthtok() fails
3203                          * to update them.
3204                          * --- BoYang
3205                          * */
3206
3207                         ret = winbind_auth_request(ctx, user, pass_new,
3208                                                    member, cctype, 0,
3209                                                    &error, &info, &policy,
3210                                                    NULL, &username_ret);
3211                         pass_old = pass_new = NULL;
3212
3213                         if (ret == PAM_SUCCESS) {
3214
3215                                 struct wbcAuthUserInfo *user_info = NULL;
3216
3217                                 if (info && info->info) {
3218                                         user_info = info->info;
3219                                 }
3220
3221                                 /* warn a user if the password is about to
3222                                  * expire soon */
3223                                 _pam_warn_password_expiry(ctx, user_info, policy,
3224                                                           warn_pwd_expire,
3225                                                           NULL, NULL);
3226
3227                                 /* set some info3 info for other modules in the
3228                                  * stack */
3229                                 _pam_set_data_info3(ctx, user_info);
3230
3231                                 /* put krb5ccname into env */
3232                                 _pam_setup_krb5_env(ctx, info);
3233
3234                                 if (username_ret) {
3235                                         pam_set_item(pamh, PAM_USER,
3236                                                      username_ret);
3237                                         _pam_log_debug(ctx, LOG_INFO,
3238                                                        "Returned user was '%s'",
3239                                                        username_ret);
3240                                         free(username_ret);
3241                                 }
3242
3243                         }
3244
3245                         if (info && info->blobs) {
3246                                 wbcFreeMemory(info->blobs);
3247                         }
3248                         wbcFreeMemory(info);
3249                         wbcFreeMemory(policy);
3250
3251                         goto out;
3252                 }
3253         } else {
3254                 ret = PAM_SERVICE_ERR;
3255         }
3256
3257 out:
3258         {
3259                 /* Deal with offline errors. */
3260                 int i;
3261                 const char *codes[] = {
3262                         "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
3263                         "NT_STATUS_NO_LOGON_SERVERS",
3264                         "NT_STATUS_ACCESS_DENIED"
3265                 };
3266
3267                 for (i=0; i<ARRAY_SIZE(codes); i++) {
3268                         int _ret;
3269                         if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
3270                                 break;
3271                         }
3272                 }
3273         }
3274
3275         wbcFreeMemory(error);
3276
3277         _PAM_LOG_FUNCTION_LEAVE("pam_sm_chauthtok", ctx, ret);
3278
3279         TALLOC_FREE(ctx);
3280
3281         return ret;
3282 }
3283
3284 #ifdef PAM_STATIC
3285
3286 /* static module data */
3287
3288 struct pam_module _pam_winbind_modstruct = {
3289         MODULE_NAME,
3290         pam_sm_authenticate,
3291         pam_sm_setcred,
3292         pam_sm_acct_mgmt,
3293         pam_sm_open_session,
3294         pam_sm_close_session,
3295         pam_sm_chauthtok
3296 };
3297
3298 #endif
3299
3300 /*
3301  * Copyright (c) Andrew Tridgell  <tridge@samba.org>   2000
3302  * Copyright (c) Tim Potter       <tpot@samba.org>     2000
3303  * Copyright (c) Andrew Bartlettt <abartlet@samba.org> 2002
3304  * Copyright (c) Guenther Deschner <gd@samba.org>      2005-2008
3305  * Copyright (c) Jan Rêkorajski 1999.
3306  * Copyright (c) Andrew G. Morgan 1996-8.
3307  * Copyright (c) Alex O. Yuriev, 1996.
3308  * Copyright (c) Cristian Gafton 1996.
3309  * Copyright (C) Elliot Lee <sopwith@redhat.com> 1996, Red Hat Software.
3310  *
3311  * Redistribution and use in source and binary forms, with or without
3312  * modification, are permitted provided that the following conditions
3313  * are met:
3314  * 1. Redistributions of source code must retain the above copyright
3315  *    notice, and the entire permission notice in its entirety,
3316  *    including the disclaimer of warranties.
3317  * 2. Redistributions in binary form must reproduce the above copyright
3318  *    notice, this list of conditions and the following disclaimer in the
3319  *    documentation and/or other materials provided with the distribution.
3320  * 3. The name of the author may not be used to endorse or promote
3321  *    products derived from this software without specific prior
3322  *    written permission.
3323  *
3324  * ALTERNATIVELY, this product may be distributed under the terms of
3325  * the GNU Public License, in which case the provisions of the GPL are
3326  * required INSTEAD OF the above restrictions.  (This clause is
3327  * necessary due to a potential bad interaction between the GPL and
3328  * the restrictions contained in a BSD-style copyright.)
3329  *
3330  * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
3331  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
3332  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
3333  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
3334  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
3335  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
3336  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
3337  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
3338  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
3339  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
3340  * OF THE POSSIBILITY OF SUCH DAMAGE.
3341  */