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