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