nsswitch/pam_winbind.c

   1 /* pam_winbind module
   2
   3    Copyright Andrew Tridgell <tridge@samba.org> 2000
   4    Copyright Tim Potter <tpot@samba.org> 2000
   5    Copyright Andrew Bartlett <abartlet@samba.org> 2002
   6    Copyright Guenther Deschner <gd@samba.org> 2005-2008
   7
   8    largely based on pam_userdb by Cristian Gafton <gafton@redhat.com> also
   9    contains large slabs of code from pam_unix by Elliot Lee
  10    <sopwith@redhat.com> (see copyright below for full details)
  11 */
  12
  13 #include "pam_winbind.h"
  14
  15 static int wbc_error_to_pam_error(wbcErr status)
  16 {
  17         switch (status) {
  18                 case WBC_ERR_SUCCESS:
  19                         return PAM_SUCCESS;
  20                 case WBC_ERR_NOT_IMPLEMENTED:
  21                         return PAM_SERVICE_ERR;
  22                 case WBC_ERR_UNKNOWN_FAILURE:
  23                         break;
  24                 case WBC_ERR_NO_MEMORY:
  25                         return PAM_BUF_ERR;
  26                 case WBC_ERR_INVALID_SID:
  27                 case WBC_ERR_INVALID_PARAM:
  28                         break;
  29                 case WBC_ERR_WINBIND_NOT_AVAILABLE:
  30                         return PAM_AUTHINFO_UNAVAIL;
  31                 case WBC_ERR_DOMAIN_NOT_FOUND:
  32                         return PAM_AUTHINFO_UNAVAIL;
  33                 case WBC_ERR_INVALID_RESPONSE:
  34                         return PAM_BUF_ERR;
  35                 case WBC_ERR_NSS_ERROR:
  36                         return PAM_USER_UNKNOWN;
  37                 case WBC_ERR_AUTH_ERROR:
  38                         return PAM_AUTH_ERR;
  39                 case WBC_ERR_UNKNOWN_USER:
  40                         return PAM_USER_UNKNOWN;
  41                 case WBC_ERR_UNKNOWN_GROUP:
  42                         return PAM_USER_UNKNOWN;
  43                 case WBC_ERR_PWD_CHANGE_FAILED:
  44                         break;
  45         }
  46
  47         /* be paranoid */
  48         return PAM_AUTH_ERR;
  49 }
  50
  51 static const char *_pam_error_code_str(int err)
  52 {
  53         switch (err) {
  54                 case PAM_SUCCESS:
  55                         return "PAM_SUCCESS";
  56                 case PAM_OPEN_ERR:
  57                         return "PAM_OPEN_ERR";
  58                 case PAM_SYMBOL_ERR:
  59                         return "PAM_SYMBOL_ERR";
  60                 case PAM_SERVICE_ERR:
  61                         return "PAM_SERVICE_ERR";
  62                 case PAM_SYSTEM_ERR:
  63                         return "PAM_SYSTEM_ERR";
  64                 case PAM_BUF_ERR:
  65                         return "PAM_BUF_ERR";
  66                 case PAM_PERM_DENIED:
  67                         return "PAM_PERM_DENIED";
  68                 case PAM_AUTH_ERR:
  69                         return "PAM_AUTH_ERR";
  70                 case PAM_CRED_INSUFFICIENT:
  71                         return "PAM_CRED_INSUFFICIENT";
  72                 case PAM_AUTHINFO_UNAVAIL:
  73                         return "PAM_AUTHINFO_UNAVAIL";
  74                 case PAM_USER_UNKNOWN:
  75                         return "PAM_USER_UNKNOWN";
  76                 case PAM_MAXTRIES:
  77                         return "PAM_MAXTRIES";
  78                 case PAM_NEW_AUTHTOK_REQD:
  79                         return "PAM_NEW_AUTHTOK_REQD";
  80                 case PAM_ACCT_EXPIRED:
  81                         return "PAM_ACCT_EXPIRED";
  82                 case PAM_SESSION_ERR:
  83                         return "PAM_SESSION_ERR";
  84                 case PAM_CRED_UNAVAIL:
  85                         return "PAM_CRED_UNAVAIL";
  86                 case PAM_CRED_EXPIRED:
  87                         return "PAM_CRED_EXPIRED";
  88                 case PAM_CRED_ERR:
  89                         return "PAM_CRED_ERR";
  90                 case PAM_NO_MODULE_DATA:
  91                         return "PAM_NO_MODULE_DATA";
  92                 case PAM_CONV_ERR:
  93                         return "PAM_CONV_ERR";
  94                 case PAM_AUTHTOK_ERR:
  95                         return "PAM_AUTHTOK_ERR";
  96                 case PAM_AUTHTOK_RECOVER_ERR:
  97                         return "PAM_AUTHTOK_RECOVER_ERR";
  98                 case PAM_AUTHTOK_LOCK_BUSY:
  99                         return "PAM_AUTHTOK_LOCK_BUSY";
 100                 case PAM_AUTHTOK_DISABLE_AGING:
 101                         return "PAM_AUTHTOK_DISABLE_AGING";
 102                 case PAM_TRY_AGAIN:
 103                         return "PAM_TRY_AGAIN";
 104                 case PAM_IGNORE:
 105                         return "PAM_IGNORE";
 106                 case PAM_ABORT:
 107                         return "PAM_ABORT";
 108                 case PAM_AUTHTOK_EXPIRED:
 109                         return "PAM_AUTHTOK_EXPIRED";
 110 #ifdef PAM_MODULE_UNKNOWN
 111                 case PAM_MODULE_UNKNOWN:
 112                         return "PAM_MODULE_UNKNOWN";
 113 #endif
 114 #ifdef PAM_BAD_ITEM
 115                 case PAM_BAD_ITEM:
 116                         return "PAM_BAD_ITEM";
 117 #endif
 118 #ifdef PAM_CONV_AGAIN
 119                 case PAM_CONV_AGAIN:
 120                         return "PAM_CONV_AGAIN";
 121 #endif
 122 #ifdef PAM_INCOMPLETE
 123                 case PAM_INCOMPLETE:
 124                         return "PAM_INCOMPLETE";
 125 #endif
 126                 default:
 127                         return NULL;
 128         }
 129 }
 130
 131 #define _PAM_LOG_FUNCTION_ENTER(function, ctx) \
 132         do { \
 133                 _pam_log_debug(ctx, LOG_DEBUG, "[pamh: %p] ENTER: " \
 134                                function " (flags: 0x%04x)", ctx->pamh, ctx->flags); \
 135                 _pam_log_state(ctx); \
 136         } while (0)
 137
 138 #define _PAM_LOG_FUNCTION_LEAVE(function, ctx, retval) \
 139         do { \
 140                 _pam_log_debug(ctx, LOG_DEBUG, "[pamh: %p] LEAVE: " \
 141                                function " returning %d (%s)", ctx->pamh, retval, \
 142                                _pam_error_code_str(retval)); \
 143                 _pam_log_state(ctx); \
 144         } while (0)
 145
 146 /* data tokens */
 147
 148 #define MAX_PASSWD_TRIES        3
 149
 150 #ifdef HAVE_GETTEXT
 151 static char initialized = 0;
 152
 153 static inline void textdomain_init(void);
 154 static inline void textdomain_init(void)
 155 {
 156         if (!initialized) {
 157                 bindtextdomain(MODULE_NAME, LOCALEDIR);
 158                 initialized = 1;
 159         }
 160         return;
 161 }
 162 #endif
 163
 164
 165 /*
 166  * Work around the pam API that has functions with void ** as parameters
 167  * These lead to strict aliasing warnings with gcc.
 168  */
 169 static int _pam_get_item(const pam_handle_t *pamh,
 170                          int item_type,
 171                          const void *_item)
 172 {
 173         const void **item = (const void **)_item;
 174         return pam_get_item(pamh, item_type, item);
 175 }
 176 static int _pam_get_data(const pam_handle_t *pamh,
 177                          const char *module_data_name,
 178                          const void *_data)
 179 {
 180         const void **data = (const void **)_data;
 181         return pam_get_data(pamh, module_data_name, data);
 182 }
 183
 184 /* some syslogging */
 185
 186 #ifdef HAVE_PAM_VSYSLOG
 187 static void _pam_log_int(const pam_handle_t *pamh,
 188                          int err,
 189                          const char *format,
 190                          va_list args)
 191 {
 192         pam_vsyslog(pamh, err, format, args);
 193 }
 194 #else
 195 static void _pam_log_int(const pam_handle_t *pamh,
 196                          int err,
 197                          const char *format,
 198                          va_list args)
 199 {
 200         char *format2 = NULL;
 201         const char *service;
 202
 203         _pam_get_item(pamh, PAM_SERVICE, &service);
 204
 205         format2 = (char *)malloc(strlen(MODULE_NAME)+strlen(format)+strlen(service)+5);
 206         if (format2 == NULL) {
 207                 /* what else todo ? */
 208                 vsyslog(err, format, args);
 209                 return;
 210         }
 211
 212         sprintf(format2, "%s(%s): %s", MODULE_NAME, service, format);
 213         vsyslog(err, format2, args);
 214         SAFE_FREE(format2);
 215 }
 216 #endif /* HAVE_PAM_VSYSLOG */
 217
 218 static bool _pam_log_is_silent(int ctrl)
 219 {
 220         return on(ctrl, WINBIND_SILENT);
 221 }
 222
 223 static void _pam_log(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
 224 static void _pam_log(struct pwb_context *r, int err, const char *format, ...)
 225 {
 226         va_list args;
 227
 228         if (_pam_log_is_silent(r->ctrl)) {
 229                 return;
 230         }
 231
 232         va_start(args, format);
 233         _pam_log_int(r->pamh, err, format, args);
 234         va_end(args);
 235 }
 236 static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
 237 static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
 238 {
 239         va_list args;
 240
 241         if (_pam_log_is_silent(ctrl)) {
 242                 return;
 243         }
 244
 245         va_start(args, format);
 246         _pam_log_int(pamh, err, format, args);
 247         va_end(args);
 248 }
 249
 250 static bool _pam_log_is_debug_enabled(int ctrl)
 251 {
 252         if (ctrl == -1) {
 253                 return false;
 254         }
 255
 256         if (_pam_log_is_silent(ctrl)) {
 257                 return false;
 258         }
 259
 260         if (!(ctrl & WINBIND_DEBUG_ARG)) {
 261                 return false;
 262         }
 263
 264         return true;
 265 }
 266
 267 static bool _pam_log_is_debug_state_enabled(int ctrl)
 268 {
 269         if (!(ctrl & WINBIND_DEBUG_STATE)) {
 270                 return false;
 271         }
 272
 273         return _pam_log_is_debug_enabled(ctrl);
 274 }
 275
 276 static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
 277 static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...)
 278 {
 279         va_list args;
 280
 281         if (!_pam_log_is_debug_enabled(r->ctrl)) {
 282                 return;
 283         }
 284
 285         va_start(args, format);
 286         _pam_log_int(r->pamh, err, format, args);
 287         va_end(args);
 288 }
 289 static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
 290 static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
 291 {
 292         va_list args;
 293
 294         if (!_pam_log_is_debug_enabled(ctrl)) {
 295                 return;
 296         }
 297
 298         va_start(args, format);
 299         _pam_log_int(pamh, err, format, args);
 300         va_end(args);
 301 }
 302
 303 static void _pam_log_state_datum(struct pwb_context *ctx,
 304                                  int item_type,
 305                                  const char *key,
 306                                  int is_string)
 307 {
 308         const void *data = NULL;
 309         if (item_type != 0) {
 310                 pam_get_item(ctx->pamh, item_type, &data);
 311         } else {
 312                 pam_get_data(ctx->pamh, key, &data);
 313         }
 314         if (data != NULL) {
 315                 const char *type = (item_type != 0) ? "ITEM" : "DATA";
 316                 if (is_string != 0) {
 317                         _pam_log_debug(ctx, LOG_DEBUG,
 318                                        "[pamh: %p] STATE: %s(%s) = \"%s\" (%p)",
 319                                        ctx->pamh, type, key, (const char *)data,
 320                                        data);
 321                 } else {
 322                         _pam_log_debug(ctx, LOG_DEBUG,
 323                                        "[pamh: %p] STATE: %s(%s) = %p",
 324                                        ctx->pamh, type, key, data);
 325                 }
 326         }
 327 }
 328
 329 #define _PAM_LOG_STATE_DATA_POINTER(ctx, module_data_name) \
 330         _pam_log_state_datum(ctx, 0, module_data_name, 0)
 331
 332 #define _PAM_LOG_STATE_DATA_STRING(ctx, module_data_name) \
 333         _pam_log_state_datum(ctx, 0, module_data_name, 1)
 334
 335 #define _PAM_LOG_STATE_ITEM_POINTER(ctx, item_type) \
 336         _pam_log_state_datum(ctx, item_type, #item_type, 0)
 337
 338 #define _PAM_LOG_STATE_ITEM_STRING(ctx, item_type) \
 339         _pam_log_state_datum(ctx, item_type, #item_type, 1)
 340
 341 #ifdef DEBUG_PASSWORD
 342 #define _LOG_PASSWORD_AS_STRING 1
 343 #else
 344 #define _LOG_PASSWORD_AS_STRING 0
 345 #endif
 346
 347 #define _PAM_LOG_STATE_ITEM_PASSWORD(ctx, item_type) \
 348         _pam_log_state_datum(ctx, item_type, #item_type, \
 349                              _LOG_PASSWORD_AS_STRING)
 350
 351 static void _pam_log_state(struct pwb_context *ctx)
 352 {
 353         if (!_pam_log_is_debug_state_enabled(ctx->ctrl)) {
 354                 return;
 355         }
 356
 357         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_SERVICE);
 358         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER);
 359         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_TTY);
 360         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RHOST);
 361         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RUSER);
 362         _PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_OLDAUTHTOK);
 363         _PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_AUTHTOK);
 364         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER_PROMPT);
 365         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_CONV);
 366 #ifdef PAM_FAIL_DELAY
 367         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_FAIL_DELAY);
 368 #endif
 369 #ifdef PAM_REPOSITORY
 370         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_REPOSITORY);
 371 #endif
 372
 373         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_HOMEDIR);
 374         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSCRIPT);
 375         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSERVER);
 376         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_PROFILEPATH);
 377         _PAM_LOG_STATE_DATA_STRING(ctx,
 378                                    PAM_WINBIND_NEW_AUTHTOK_REQD);
 379                                    /* Use atoi to get PAM result code */
 380         _PAM_LOG_STATE_DATA_STRING(ctx,
 381                                    PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH);
 382         _PAM_LOG_STATE_DATA_POINTER(ctx, PAM_WINBIND_PWD_LAST_SET);
 383 }
 384
 385 static int _pam_parse(const pam_handle_t *pamh,
 386                       int flags,
 387                       int argc,
 388                       const char **argv,
 389                       dictionary **result_d)
 390 {
 391         int ctrl = 0;
 392         const char *config_file = NULL;
 393         int i;
 394         const char **v;
 395         dictionary *d = NULL;
 396
 397         if (flags & PAM_SILENT) {
 398                 ctrl |= WINBIND_SILENT;
 399         }
 400
 401         for (i=argc,v=argv; i-- > 0; ++v) {
 402                 if (!strncasecmp(*v, "config", strlen("config"))) {
 403                         ctrl |= WINBIND_CONFIG_FILE;
 404                         config_file = v[i];
 405                         break;
 406                 }
 407         }
 408
 409         if (config_file == NULL) {
 410                 config_file = PAM_WINBIND_CONFIG_FILE;
 411         }
 412
 413         d = iniparser_load(discard_const_p(char, config_file));
 414         if (d == NULL) {
 415                 goto config_from_pam;
 416         }
 417
 418         if (iniparser_getboolean(d, discard_const_p(char, "global:debug"), false)) {
 419                 ctrl |= WINBIND_DEBUG_ARG;
 420         }
 421
 422         if (iniparser_getboolean(d, discard_const_p(char, "global:debug_state"), false)) {
 423                 ctrl |= WINBIND_DEBUG_STATE;
 424         }
 425
 426         if (iniparser_getboolean(d, discard_const_p(char, "global:cached_login"), false)) {
 427                 ctrl |= WINBIND_CACHED_LOGIN;
 428         }
 429
 430         if (iniparser_getboolean(d, discard_const_p(char, "global:krb5_auth"), false)) {
 431                 ctrl |= WINBIND_KRB5_AUTH;
 432         }
 433
 434         if (iniparser_getboolean(d, discard_const_p(char, "global:silent"), false)) {
 435                 ctrl |= WINBIND_SILENT;
 436         }
 437
 438         if (iniparser_getstr(d, discard_const_p(char, "global:krb5_ccache_type")) != NULL) {
 439                 ctrl |= WINBIND_KRB5_CCACHE_TYPE;
 440         }
 441
 442         if ((iniparser_getstr(d, discard_const_p(char, "global:require-membership-of"))
 443              != NULL) ||
 444             (iniparser_getstr(d, discard_const_p(char, "global:require_membership_of"))
 445              != NULL)) {
 446                 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 447         }
 448
 449         if (iniparser_getboolean(d, discard_const_p(char, "global:try_first_pass"), false)) {
 450                 ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
 451         }
 452
 453         if (iniparser_getint(d, discard_const_p(char, "global:warn_pwd_expire"), 0)) {
 454                 ctrl |= WINBIND_WARN_PWD_EXPIRE;
 455         }
 456
 457         if (iniparser_getboolean(d, discard_const_p(char, "global:mkhomedir"), false)) {
 458                 ctrl |= WINBIND_MKHOMEDIR;
 459         }
 460
 461 config_from_pam:
 462         /* step through arguments */
 463         for (i=argc,v=argv; i-- > 0; ++v) {
 464
 465                 /* generic options */
 466                 if (!strcmp(*v,"debug"))
 467                         ctrl |= WINBIND_DEBUG_ARG;
 468                 else if (!strcasecmp(*v, "debug_state"))
 469                         ctrl |= WINBIND_DEBUG_STATE;
 470                 else if (!strcasecmp(*v, "silent"))
 471                         ctrl |= WINBIND_SILENT;
 472                 else if (!strcasecmp(*v, "use_authtok"))
 473                         ctrl |= WINBIND_USE_AUTHTOK_ARG;
 474                 else if (!strcasecmp(*v, "use_first_pass"))
 475                         ctrl |= WINBIND_USE_FIRST_PASS_ARG;
 476                 else if (!strcasecmp(*v, "try_first_pass"))
 477                         ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
 478                 else if (!strcasecmp(*v, "unknown_ok"))
 479                         ctrl |= WINBIND_UNKNOWN_OK_ARG;
 480                 else if (!strncasecmp(*v, "require_membership_of",
 481                                       strlen("require_membership_of")))
 482                         ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 483                 else if (!strncasecmp(*v, "require-membership-of",
 484                                       strlen("require-membership-of")))
 485                         ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 486                 else if (!strcasecmp(*v, "krb5_auth"))
 487                         ctrl |= WINBIND_KRB5_AUTH;
 488                 else if (!strncasecmp(*v, "krb5_ccache_type",
 489                                       strlen("krb5_ccache_type")))
 490                         ctrl |= WINBIND_KRB5_CCACHE_TYPE;
 491                 else if (!strcasecmp(*v, "cached_login"))
 492                         ctrl |= WINBIND_CACHED_LOGIN;
 493                 else if (!strcasecmp(*v, "mkhomedir"))
 494                         ctrl |= WINBIND_MKHOMEDIR;
 495                 else {
 496                         __pam_log(pamh, ctrl, LOG_ERR,
 497                                  "pam_parse: unknown option: %s", *v);
 498                         return -1;
 499                 }
 500
 501         }
 502
 503         if (result_d) {
 504                 *result_d = d;
 505         } else {
 506                 if (d) {
 507                         iniparser_freedict(d);
 508                 }
 509         }
 510
 511         return ctrl;
 512 };
 513
 514 static int _pam_winbind_free_context(struct pwb_context *ctx)
 515 {
 516         if (!ctx) {
 517                 return 0;
 518         }
 519
 520         if (ctx->dict) {
 521                 iniparser_freedict(ctx->dict);
 522         }
 523
 524         return 0;
 525 }
 526
 527 static int _pam_winbind_init_context(pam_handle_t *pamh,
 528                                      int flags,
 529                                      int argc,
 530                                      const char **argv,
 531                                      struct pwb_context **ctx_p)
 532 {
 533         struct pwb_context *r = NULL;
 534
 535 #ifdef HAVE_GETTEXT
 536         textdomain_init();
 537 #endif
 538
 539         r = TALLOC_ZERO_P(NULL, struct pwb_context);
 540         if (!r) {
 541                 return PAM_BUF_ERR;
 542         }
 543
 544         talloc_set_destructor(r, _pam_winbind_free_context);
 545
 546         r->pamh = pamh;
 547         r->flags = flags;
 548         r->argc = argc;
 549         r->argv = argv;
 550         r->ctrl = _pam_parse(pamh, flags, argc, argv, &r->dict);
 551         if (r->ctrl == -1) {
 552                 TALLOC_FREE(r);
 553                 return PAM_SYSTEM_ERR;
 554         }
 555
 556         *ctx_p = r;
 557
 558         return PAM_SUCCESS;
 559 }
 560
 561 static void _pam_winbind_cleanup_func(pam_handle_t *pamh,
 562                                       void *data,
 563                                       int error_status)
 564 {
 565         int ctrl = _pam_parse(pamh, 0, 0, NULL, NULL);
 566         if (_pam_log_is_debug_state_enabled(ctrl)) {
 567                 __pam_log_debug(pamh, ctrl, LOG_DEBUG,
 568                                "[pamh: %p] CLEAN: cleaning up PAM data %p "
 569                                "(error_status = %d)", pamh, data,
 570                                error_status);
 571         }
 572         TALLOC_FREE(data);
 573 }
 574
 575
 576 static const struct ntstatus_errors {
 577         const char *ntstatus_string;
 578         const char *error_string;
 579 } ntstatus_errors[] = {
 580         {"NT_STATUS_OK",
 581                 N_("Success")},
 582         {"NT_STATUS_BACKUP_CONTROLLER",
 583                 N_("No primary Domain Controler available")},
 584         {"NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
 585                 N_("No domain controllers found")},
 586         {"NT_STATUS_NO_LOGON_SERVERS",
 587                 N_("No logon servers")},
 588         {"NT_STATUS_PWD_TOO_SHORT",
 589                 N_("Password too short")},
 590         {"NT_STATUS_PWD_TOO_RECENT",
 591                 N_("The password of this user is too recent to change")},
 592         {"NT_STATUS_PWD_HISTORY_CONFLICT",
 593                 N_("Password is already in password history")},
 594         {"NT_STATUS_PASSWORD_EXPIRED",
 595                 N_("Your password has expired")},
 596         {"NT_STATUS_PASSWORD_MUST_CHANGE",
 597                 N_("You need to change your password now")},
 598         {"NT_STATUS_INVALID_WORKSTATION",
 599                 N_("You are not allowed to logon from this workstation")},
 600         {"NT_STATUS_INVALID_LOGON_HOURS",
 601                 N_("You are not allowed to logon at this time")},
 602         {"NT_STATUS_ACCOUNT_EXPIRED",
 603                 N_("Your account has expired. "
 604                    "Please contact your System administrator")}, /* SCNR */
 605         {"NT_STATUS_ACCOUNT_DISABLED",
 606                 N_("Your account is disabled. "
 607                    "Please contact your System administrator")}, /* SCNR */
 608         {"NT_STATUS_ACCOUNT_LOCKED_OUT",
 609                 N_("Your account has been locked. "
 610                    "Please contact your System administrator")}, /* SCNR */
 611         {"NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
 612                 N_("Invalid Trust Account")},
 613         {"NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
 614                 N_("Invalid Trust Account")},
 615         {"NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
 616                 N_("Invalid Trust Account")},
 617         {"NT_STATUS_ACCESS_DENIED",
 618                 N_("Access is denied")},
 619         {NULL, NULL}
 620 };
 621
 622 static const char *_get_ntstatus_error_string(const char *nt_status_string)
 623 {
 624         int i;
 625         for (i=0; ntstatus_errors[i].ntstatus_string != NULL; i++) {
 626                 if (!strcasecmp(ntstatus_errors[i].ntstatus_string,
 627                                 nt_status_string)) {
 628                         return _(ntstatus_errors[i].error_string);
 629                 }
 630         }
 631         return NULL;
 632 }
 633
 634 /* --- authentication management functions --- */
 635
 636 /* Attempt a conversation */
 637
 638 static int converse(const pam_handle_t *pamh,
 639                     int nargs,
 640                     struct pam_message **message,
 641                     struct pam_response **response)
 642 {
 643         int retval;
 644         struct pam_conv *conv;
 645
 646         retval = _pam_get_item(pamh, PAM_CONV, &conv);
 647         if (retval == PAM_SUCCESS) {
 648                 retval = conv->conv(nargs,
 649                                     (const struct pam_message **)message,
 650                                     response, conv->appdata_ptr);
 651         }
 652
 653         return retval; /* propagate error status */
 654 }
 655
 656
 657 static int _make_remark(struct pwb_context *ctx,
 658                         int type,
 659                         const char *text)
 660 {
 661         int retval = PAM_SUCCESS;
 662
 663         struct pam_message *pmsg[1], msg[1];
 664         struct pam_response *resp;
 665
 666         if (ctx->flags & WINBIND_SILENT) {
 667                 return PAM_SUCCESS;
 668         }
 669
 670         pmsg[0] = &msg[0];
 671         msg[0].msg = discard_const_p(char, text);
 672         msg[0].msg_style = type;
 673
 674         resp = NULL;
 675         retval = converse(ctx->pamh, 1, pmsg, &resp);
 676
 677         if (resp) {
 678                 _pam_drop_reply(resp, 1);
 679         }
 680         return retval;
 681 }
 682
 683 static int _make_remark_v(struct pwb_context *ctx,
 684                           int type,
 685                           const char *format,
 686                           va_list args)
 687 {
 688         char *var;
 689         int ret;
 690
 691         ret = vasprintf(&var, format, args);
 692         if (ret < 0) {
 693                 _pam_log(ctx, LOG_ERR, "memory allocation failure");
 694                 return ret;
 695         }
 696
 697         ret = _make_remark(ctx, type, var);
 698         SAFE_FREE(var);
 699         return ret;
 700 }
 701
 702 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
 703 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...)
 704 {
 705         int ret;
 706         va_list args;
 707
 708         va_start(args, format);
 709         ret = _make_remark_v(ctx, type, format, args);
 710         va_end(args);
 711         return ret;
 712 }
 713
 714 static int pam_winbind_request_log(struct pwb_context *ctx,
 715                                    int retval,
 716                                    const char *user,
 717                                    const char *fn)
 718 {
 719         switch (retval) {
 720         case PAM_AUTH_ERR:
 721                 /* incorrect password */
 722                 _pam_log(ctx, LOG_WARNING, "user '%s' denied access "
 723                          "(incorrect password or invalid membership)", user);
 724                 return retval;
 725         case PAM_ACCT_EXPIRED:
 726                 /* account expired */
 727                 _pam_log(ctx, LOG_WARNING, "user '%s' account expired",
 728                          user);
 729                 return retval;
 730         case PAM_AUTHTOK_EXPIRED:
 731                 /* password expired */
 732                 _pam_log(ctx, LOG_WARNING, "user '%s' password expired",
 733                          user);
 734                 return retval;
 735         case PAM_NEW_AUTHTOK_REQD:
 736                 /* new password required */
 737                 _pam_log(ctx, LOG_WARNING, "user '%s' new password "
 738                          "required", user);
 739                 return retval;
 740         case PAM_USER_UNKNOWN:
 741                 /* the user does not exist */
 742                 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
 743                                user);
 744                 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
 745                         return PAM_IGNORE;
 746                 }
 747                 return retval;
 748         case PAM_SUCCESS:
 749                 /* Otherwise, the authentication looked good */
 750                 if (strcmp(fn, "wbcLogonUser") == 0) {
 751                         _pam_log(ctx, LOG_NOTICE,
 752                                  "user '%s' granted access", user);
 753                 } else {
 754                         _pam_log(ctx, LOG_NOTICE,
 755                                  "user '%s' OK", user);
 756                 }
 757                 return retval;
 758         default:
 759                 /* we don't know anything about this return value */
 760                 _pam_log(ctx, LOG_ERR,
 761                          "internal module error (retval = %s(%d), user = '%s')",
 762                         _pam_error_code_str(retval), retval, user);
 763                 return retval;
 764         }
 765 }
 766
 767 static int wbc_auth_error_to_pam_error(struct pwb_context *ctx,
 768                                        struct wbcAuthErrorInfo *e,
 769                                        wbcErr status,
 770                                        const char *username,
 771                                        const char *fn)
 772 {
 773         int ret = PAM_AUTH_ERR;
 774
 775         if (WBC_ERROR_IS_OK(status)) {
 776                 _pam_log_debug(ctx, LOG_DEBUG, "request %s succeeded",
 777                         fn);
 778                 ret = PAM_SUCCESS;
 779                 return pam_winbind_request_log(ctx, ret, username, fn);
 780         }
 781
 782         if (e) {
 783                 if (e->pam_error != PAM_SUCCESS) {
 784                         _pam_log(ctx, LOG_ERR,
 785                                  "request %s failed: %s, "
 786                                  "PAM error: %s (%d), NTSTATUS: %s, "
 787                                  "Error message was: %s",
 788                                  fn,
 789                                  wbcErrorString(status),
 790                                  _pam_error_code_str(e->pam_error),
 791                                  e->pam_error,
 792                                  e->nt_string,
 793                                  e->display_string);
 794                         ret = e->pam_error;
 795                         return pam_winbind_request_log(ctx, ret, username, fn);
 796                 }
 797
 798                 _pam_log(ctx, LOG_ERR, "request %s failed, but PAM error 0!", fn);
 799
 800                 ret = PAM_SERVICE_ERR;
 801                 return pam_winbind_request_log(ctx, ret, username, fn);
 802         }
 803
 804         ret = wbc_error_to_pam_error(status);
 805         return pam_winbind_request_log(ctx, ret, username, fn);
 806 }
 807
 808 #if defined(HAVE_PAM_RADIO_TYPE)
 809 static bool _pam_winbind_change_pwd(struct pwb_context *ctx)
 810 {
 811         struct pam_message msg, *pmsg;
 812         struct pam_response *resp = NULL;
 813         const char *prompt;
 814         int ret;
 815         bool retval = false;
 816         prompt = _("Do you want to change your password now?");
 817         pmsg = &msg;
 818         msg.msg_style = PAM_RADIO_TYPE;
 819         msg.msg = prompt;
 820         ret = converse(ctx->pamh, 1, &pmsg, &resp);
 821         if (resp == NULL) {
 822                 if (ret == PAM_SUCCESS) {
 823                         _pam_log(ctx, LOG_CRIT, "pam_winbind: system error!\n");
 824                         return false;
 825                 }
 826         }
 827         if (ret != PAM_SUCCESS) {
 828                 return false;
 829         }
 830         _pam_log(ctx, LOG_CRIT, "Received [%s] reply from application.\n", resp->resp);
 831
 832         if (strcasecmp(resp->resp, "yes") == 0) {
 833                 retval = true;
 834         }
 835
 836         _pam_drop_reply(resp, 1);
 837         return retval;
 838 }
 839 #else
 840 static bool _pam_winbind_change_pwd(struct pwb_context *ctx)
 841 {
 842         return false;
 843 }
 844 #endif
 845
 846 /**
 847  * send a password expiry message if required
 848  *
 849  * @param ctx PAM winbind context.
 850  * @param next_change expected (calculated) next expiry date.
 851  * @param already_expired pointer to a boolean to indicate if the password is
 852  *        already expired.
 853  *
 854  * @return boolean Returns true if message has been sent, false if not.
 855  */
 856
 857 static bool _pam_send_password_expiry_message(struct pwb_context *ctx,
 858                                               time_t next_change,
 859                                               time_t now,
 860                                               int warn_pwd_expire,
 861                                               bool *already_expired,
 862                                               bool *change_pwd)
 863 {
 864         int days = 0;
 865         struct tm tm_now, tm_next_change;
 866         bool retval = false;
 867         int ret;
 868
 869         if (already_expired) {
 870                 *already_expired = false;
 871         }
 872
 873         if (change_pwd) {
 874                 *change_pwd = false;
 875         }
 876
 877         if (next_change <= now) {
 878                 PAM_WB_REMARK_DIRECT(ctx, "NT_STATUS_PASSWORD_EXPIRED");
 879                 if (already_expired) {
 880                         *already_expired = true;
 881                 }
 882                 return true;
 883         }
 884
 885         if ((next_change < 0) ||
 886             (next_change > now + warn_pwd_expire * SECONDS_PER_DAY)) {
 887                 return false;
 888         }
 889
 890         if ((localtime_r(&now, &tm_now) == NULL) ||
 891             (localtime_r(&next_change, &tm_next_change) == NULL)) {
 892                 return false;
 893         }
 894
 895         days = (tm_next_change.tm_yday+tm_next_change.tm_year*365) -
 896                (tm_now.tm_yday+tm_now.tm_year*365);
 897
 898         if (days == 0) {
 899                 ret = _make_remark(ctx, PAM_TEXT_INFO,
 900                                 _("Your password expires today.\n"));
 901
 902                 /*
 903                  * If change_pwd and already_expired is null.
 904                  * We are just sending a notification message.
 905                  * We don't expect any response in this case.
 906                  */
 907
 908                 if (!change_pwd && !already_expired) {
 909                         return true;
 910                 }
 911
 912                 /*
 913                  * successfully sent the warning message.
 914                  * Give the user a chance to change pwd.
 915                  */
 916                 if (ret == PAM_SUCCESS) {
 917                         if (change_pwd) {
 918                                 retval = _pam_winbind_change_pwd(ctx);
 919                                 if (retval) {
 920                                         *change_pwd = true;
 921                                 }
 922                         }
 923                 }
 924                 return true;
 925         }
 926
 927         if (days > 0 && days < warn_pwd_expire) {
 928
 929                 ret = _make_remark_format(ctx, PAM_TEXT_INFO,
 930                                         _("Your password will expire in %d %s.\n"),
 931                                         days, (days > 1) ? _("days"):_("day"));
 932                 /*
 933                  * If change_pwd and already_expired is null.
 934                  * We are just sending a notification message.
 935                  * We don't expect any response in this case.
 936                  */
 937
 938                 if (!change_pwd && !already_expired) {
 939                         return true;
 940                 }
 941
 942                 /*
 943                  * successfully sent the warning message.
 944                  * Give the user a chance to change pwd.
 945                  */
 946                 if (ret == PAM_SUCCESS) {
 947                         if (change_pwd) {
 948                                 retval = _pam_winbind_change_pwd(ctx);
 949                                 if (retval) {
 950                                         *change_pwd = true;
 951                                 }
 952                         }
 953                 }
 954                 return true;
 955         }
 956
 957         return false;
 958 }
 959
 960 /**
 961  * Send a warning if the password expires in the near future
 962  *
 963  * @param ctx PAM winbind context.
 964  * @param response The full authentication response structure.
 965  * @param already_expired boolean, is the pwd already expired?
 966  *
 967  * @return void.
 968  */
 969
 970 static void _pam_warn_password_expiry(struct pwb_context *ctx,
 971                                       const struct wbcAuthUserInfo *info,
 972                                       const struct wbcUserPasswordPolicyInfo *policy,
 973                                       int warn_pwd_expire,
 974                                       bool *already_expired,
 975                                       bool *change_pwd)
 976 {
 977         time_t now = time(NULL);
 978         time_t next_change = 0;
 979
 980         if (!info || !policy) {
 981                 return;
 982         }
 983
 984         if (already_expired) {
 985                 *already_expired = false;
 986         }
 987
 988         if (change_pwd) {
 989                 *change_pwd = false;
 990         }
 991
 992         /* accounts with WBC_ACB_PWNOEXP set never receive a warning */
 993         if (info->acct_flags & WBC_ACB_PWNOEXP) {
 994                 return;
 995         }
 996
 997         /* no point in sending a warning if this is a grace logon */
 998         if (PAM_WB_GRACE_LOGON(info->user_flags)) {
 999                 return;
1000         }
1001
1002         /* check if the info3 must change timestamp has been set */
1003         next_change = info->pass_must_change_time;
1004
1005         if (_pam_send_password_expiry_message(ctx, next_change, now,
1006                                               warn_pwd_expire,
1007                                               already_expired,
1008                                               change_pwd)) {
1009                 return;
1010         }
1011
1012         /* now check for the global password policy */
1013         /* good catch from Ralf Haferkamp: an expiry of "never" is translated
1014          * to -1 */
1015         if ((policy->expire == (int64_t)-1) ||
1016             (policy->expire == 0)) {
1017                 return;
1018         }
1019
1020         next_change = info->pass_last_set_time + policy->expire;
1021
1022         if (_pam_send_password_expiry_message(ctx, next_change, now,
1023                                               warn_pwd_expire,
1024                                               already_expired,
1025                                               change_pwd)) {
1026                 return;
1027         }
1028
1029         /* no warning sent */
1030 }
1031
1032 #define IS_SID_STRING(name) (strncmp("S-", name, 2) == 0)
1033
1034 /**
1035  * Append a string, making sure not to overflow and to always return a
1036  * NULL-terminated string.
1037  *
1038  * @param dest Destination string buffer (must already be NULL-terminated).
1039  * @param src Source string buffer.
1040  * @param dest_buffer_size Size of dest buffer in bytes.
1041  *
1042  * @return false if dest buffer is not big enough (no bytes copied), true on
1043  * success.
1044  */
1045
1046 static bool safe_append_string(char *dest,
1047                                const char *src,
1048                                int dest_buffer_size)
1049 {
1050         int dest_length = strlen(dest);
1051         int src_length = strlen(src);
1052
1053         if (dest_length + src_length + 1 > dest_buffer_size) {
1054                 return false;
1055         }
1056
1057         memcpy(dest + dest_length, src, src_length + 1);
1058         return true;
1059 }
1060
1061 /**
1062  * Convert a names into a SID string, appending it to a buffer.
1063  *
1064  * @param ctx PAM winbind context.
1065  * @param user User in PAM request.
1066  * @param name Name to convert.
1067  * @param sid_list_buffer Where to append the string sid.
1068  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1069  *
1070  * @return false on failure, true on success.
1071  */
1072 static bool winbind_name_to_sid_string(struct pwb_context *ctx,
1073                                        const char *user,
1074                                        const char *name,
1075                                        char *sid_list_buffer,
1076                                        int sid_list_buffer_size)
1077 {
1078         char sid_string[WBC_SID_STRING_BUFLEN];
1079
1080         /* lookup name? */
1081         if (IS_SID_STRING(name)) {
1082                 strlcpy(sid_string, name, sizeof(sid_string));
1083         } else {
1084                 wbcErr wbc_status;
1085                 struct wbcDomainSid sid;
1086                 enum wbcSidType type;
1087
1088                 _pam_log_debug(ctx, LOG_DEBUG,
1089                                "no sid given, looking up: %s\n", name);
1090
1091                 wbc_status = wbcLookupName("", name, &sid, &type);
1092                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1093                         _pam_log(ctx, LOG_INFO,
1094                                  "could not lookup name: %s\n", name);
1095                         return false;
1096                 }
1097
1098                 wbcSidToStringBuf(&sid, sid_string, sizeof(sid_string));
1099         }
1100
1101         if (!safe_append_string(sid_list_buffer, sid_string,
1102                                 sid_list_buffer_size)) {
1103                 return false;
1104         }
1105         return true;
1106 }
1107
1108 /**
1109  * Convert a list of names into a list of sids.
1110  *
1111  * @param ctx PAM winbind context.
1112  * @param user User in PAM request.
1113  * @param name_list List of names or string sids, separated by commas.
1114  * @param sid_list_buffer Where to put the list of string sids.
1115  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1116  *
1117  * @return false on failure, true on success.
1118  */
1119 static bool winbind_name_list_to_sid_string_list(struct pwb_context *ctx,
1120                                                  const char *user,
1121                                                  const char *name_list,
1122                                                  char *sid_list_buffer,
1123                                                  int sid_list_buffer_size)
1124 {
1125         bool result = false;
1126         char *current_name = NULL;
1127         const char *search_location;
1128         const char *comma;
1129         int len;
1130
1131         if (sid_list_buffer_size > 0) {
1132                 sid_list_buffer[0] = 0;
1133         }
1134
1135         search_location = name_list;
1136         while ((comma = strchr(search_location, ',')) != NULL) {
1137                 current_name = strndup(search_location,
1138                                        comma - search_location);
1139                 if (NULL == current_name) {
1140                         goto out;
1141                 }
1142
1143                 if (!winbind_name_to_sid_string(ctx, user,
1144                                                 current_name,
1145                                                 sid_list_buffer,
1146                                                 sid_list_buffer_size)) {
1147                         /*
1148                          * If one group name failed, we must not fail
1149                          * the authentication totally, continue with
1150                          * the following group names. If user belongs to
1151                          * one of the valid groups, we must allow it
1152                          * login. -- BoYang
1153                          */
1154
1155                         _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1156                                  "check if group %s is valid group.", current_name,
1157                                  current_name);
1158                         _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1159                                         "to sid, please contact your administrator to see "
1160                                         "if group %s is valid."), current_name, current_name);
1161                         SAFE_FREE(current_name);
1162                         search_location = comma + 1;
1163                         continue;
1164                 }
1165
1166                 SAFE_FREE(current_name);
1167
1168                 if (!safe_append_string(sid_list_buffer, ",",
1169                                         sid_list_buffer_size)) {
1170                         goto out;
1171                 }
1172
1173                 search_location = comma + 1;
1174         }
1175
1176         if (!winbind_name_to_sid_string(ctx, user, search_location,
1177                                         sid_list_buffer,
1178                                         sid_list_buffer_size)) {
1179                 _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1180                          "check if group %s is valid group.", search_location,
1181                          search_location);
1182                 _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1183                                 "to sid, please contact your administrator to see "
1184                                 "if group %s is valid."), search_location, search_location);
1185                 /*
1186                  * The lookup of the last name failed..
1187                  * It results in require_member_of_sid ends with ','
1188                  * It is malformated parameter here, overwrite the last ','.
1189                  */
1190                 len = strlen(sid_list_buffer);
1191                 if ((len != 0) && (sid_list_buffer[len - 1] == ',')) {
1192                         sid_list_buffer[len - 1] = '\0';
1193                 }
1194         }
1195
1196         result = true;
1197
1198 out:
1199         SAFE_FREE(current_name);
1200         return result;
1201 }
1202
1203 /**
1204  * put krb5ccname variable into environment
1205  *
1206  * @param ctx PAM winbind context.
1207  * @param krb5ccname env variable retrieved from winbindd.
1208  *
1209  * @return void.
1210  */
1211
1212 static void _pam_setup_krb5_env(struct pwb_context *ctx,
1213                                 struct wbcLogonUserInfo *info)
1214 {
1215         char var[PATH_MAX];
1216         int ret;
1217         uint32_t i;
1218         const char *krb5ccname = NULL;
1219
1220         if (off(ctx->ctrl, WINBIND_KRB5_AUTH)) {
1221                 return;
1222         }
1223
1224         if (!info) {
1225                 return;
1226         }
1227
1228         for (i=0; i < info->num_blobs; i++) {
1229                 if (strcasecmp(info->blobs[i].name, "krb5ccname") == 0) {
1230                         krb5ccname = (const char *)info->blobs[i].blob.data;
1231                         break;
1232                 }
1233         }
1234
1235         if (!krb5ccname || (strlen(krb5ccname) == 0)) {
1236                 return;
1237         }
1238
1239         _pam_log_debug(ctx, LOG_DEBUG,
1240                        "request returned KRB5CCNAME: %s", krb5ccname);
1241
1242         if (snprintf(var, sizeof(var), "KRB5CCNAME=%s", krb5ccname) == -1) {
1243                 return;
1244         }
1245
1246         ret = pam_putenv(ctx->pamh, var);
1247         if (ret) {
1248                 _pam_log(ctx, LOG_ERR,
1249                          "failed to set KRB5CCNAME to %s: %s",
1250                          var, pam_strerror(ctx->pamh, ret));
1251         }
1252 }
1253
1254 /**
1255  * Copy unix username if available (further processed in PAM).
1256  *
1257  * @param ctx PAM winbind context
1258  * @param user_ret A pointer that holds a pointer to a string
1259  * @param unix_username A username
1260  *
1261  * @return void.
1262  */
1263
1264 static void _pam_setup_unix_username(struct pwb_context *ctx,
1265                                      char **user_ret,
1266                                      struct wbcLogonUserInfo *info)
1267 {
1268         const char *unix_username = NULL;
1269         uint32_t i;
1270
1271         if (!user_ret || !info) {
1272                 return;
1273         }
1274
1275         for (i=0; i < info->num_blobs; i++) {
1276                 if (strcasecmp(info->blobs[i].name, "unix_username") == 0) {
1277                         unix_username = (const char *)info->blobs[i].blob.data;
1278                         break;
1279                 }
1280         }
1281
1282         if (!unix_username || !unix_username[0]) {
1283                 return;
1284         }
1285
1286         *user_ret = strdup(unix_username);
1287 }
1288
1289 /**
1290  * Set string into the PAM stack.
1291  *
1292  * @param ctx PAM winbind context.
1293  * @param data_name Key name for pam_set_data.
1294  * @param value String value.
1295  *
1296  * @return void.
1297  */
1298
1299 static void _pam_set_data_string(struct pwb_context *ctx,
1300                                  const char *data_name,
1301                                  const char *value)
1302 {
1303         int ret;
1304
1305         if (!data_name || !value || (strlen(data_name) == 0) ||
1306              (strlen(value) == 0)) {
1307                 return;
1308         }
1309
1310         ret = pam_set_data(ctx->pamh, data_name, talloc_strdup(NULL, value),
1311                            _pam_winbind_cleanup_func);
1312         if (ret) {
1313                 _pam_log_debug(ctx, LOG_DEBUG,
1314                                "Could not set data %s: %s\n",
1315                                data_name, pam_strerror(ctx->pamh, ret));
1316         }
1317 }
1318
1319 /**
1320  * Set info3 strings into the PAM stack.
1321  *
1322  * @param ctx PAM winbind context.
1323  * @param data_name Key name for pam_set_data.
1324  * @param value String value.
1325  *
1326  * @return void.
1327  */
1328
1329 static void _pam_set_data_info3(struct pwb_context *ctx,
1330                                 const struct wbcAuthUserInfo *info)
1331 {
1332         _pam_set_data_string(ctx, PAM_WINBIND_HOMEDIR,
1333                              info->home_directory);
1334         _pam_set_data_string(ctx, PAM_WINBIND_LOGONSCRIPT,
1335                              info->logon_script);
1336         _pam_set_data_string(ctx, PAM_WINBIND_LOGONSERVER,
1337                              info->logon_server);
1338         _pam_set_data_string(ctx, PAM_WINBIND_PROFILEPATH,
1339                              info->profile_path);
1340 }
1341
1342 /**
1343  * Free info3 strings in the PAM stack.
1344  *
1345  * @param pamh PAM handle
1346  *
1347  * @return void.
1348  */
1349
1350 static void _pam_free_data_info3(pam_handle_t *pamh)
1351 {
1352         pam_set_data(pamh, PAM_WINBIND_HOMEDIR, NULL, NULL);
1353         pam_set_data(pamh, PAM_WINBIND_LOGONSCRIPT, NULL, NULL);
1354         pam_set_data(pamh, PAM_WINBIND_LOGONSERVER, NULL, NULL);
1355         pam_set_data(pamh, PAM_WINBIND_PROFILEPATH, NULL, NULL);
1356 }
1357
1358 /**
1359  * Send PAM_ERROR_MSG for cached or grace logons.
1360  *
1361  * @param ctx PAM winbind context.
1362  * @param username User in PAM request.
1363  * @param info3_user_flgs Info3 flags containing logon type bits.
1364  *
1365  * @return void.
1366  */
1367
1368 static void _pam_warn_logon_type(struct pwb_context *ctx,
1369                                  const char *username,
1370                                  uint32_t info3_user_flgs)
1371 {
1372         /* inform about logon type */
1373         if (PAM_WB_GRACE_LOGON(info3_user_flgs)) {
1374
1375                 _make_remark(ctx, PAM_ERROR_MSG,
1376                              _("Grace login. "
1377                                "Please change your password as soon you're "
1378                                "online again"));
1379                 _pam_log_debug(ctx, LOG_DEBUG,
1380                                "User %s logged on using grace logon\n",
1381                                username);
1382
1383         } else if (PAM_WB_CACHED_LOGON(info3_user_flgs)) {
1384
1385                 _make_remark(ctx, PAM_ERROR_MSG,
1386                              _("Domain Controller unreachable, "
1387                                "using cached credentials instead. "
1388                                "Network resources may be unavailable"));
1389                 _pam_log_debug(ctx, LOG_DEBUG,
1390                                "User %s logged on using cached credentials\n",
1391                                username);
1392         }
1393 }
1394
1395 /**
1396  * Send PAM_ERROR_MSG for krb5 errors.
1397  *
1398  * @param ctx PAM winbind context.
1399  * @param username User in PAM request.
1400  * @param info3_user_flgs Info3 flags containing logon type bits.
1401  *
1402  * @return void.
1403  */
1404
1405 static void _pam_warn_krb5_failure(struct pwb_context *ctx,
1406                                    const char *username,
1407                                    uint32_t info3_user_flgs)
1408 {
1409         if (PAM_WB_KRB5_CLOCK_SKEW(info3_user_flgs)) {
1410                 _make_remark(ctx, PAM_ERROR_MSG,
1411                              _("Failed to establish your Kerberos Ticket cache "
1412                                "due time differences\n"
1413                                "with the domain controller.  "
1414                                "Please verify the system time.\n"));
1415                 _pam_log_debug(ctx, LOG_DEBUG,
1416                                "User %s: Clock skew when getting Krb5 TGT\n",
1417                                username);
1418         }
1419 }
1420
1421 static bool _pam_check_remark_auth_err(struct pwb_context *ctx,
1422                                        const struct wbcAuthErrorInfo *e,
1423                                        const char *nt_status_string,
1424                                        int *pam_err)
1425 {
1426         const char *ntstatus = NULL;
1427         const char *error_string = NULL;
1428
1429         if (!e || !pam_err) {
1430                 return false;
1431         }
1432
1433         ntstatus = e->nt_string;
1434         if (!ntstatus) {
1435                 return false;
1436         }
1437
1438         if (strcasecmp(ntstatus, nt_status_string) == 0) {
1439
1440                 error_string = _get_ntstatus_error_string(nt_status_string);
1441                 if (error_string) {
1442                         _make_remark(ctx, PAM_ERROR_MSG, error_string);
1443                         *pam_err = e->pam_error;
1444                         return true;
1445                 }
1446
1447                 if (e->display_string) {
1448                         _make_remark(ctx, PAM_ERROR_MSG, _(e->display_string));
1449                         *pam_err = e->pam_error;
1450                         return true;
1451                 }
1452
1453                 _make_remark(ctx, PAM_ERROR_MSG, nt_status_string);
1454                 *pam_err = e->pam_error;
1455
1456                 return true;
1457         }
1458
1459         return false;
1460 };
1461
1462 /**
1463  * Compose Password Restriction String for a PAM_ERROR_MSG conversation.
1464  *
1465  * @param i The wbcUserPasswordPolicyInfo struct.
1466  *
1467  * @return string (caller needs to talloc_free).
1468  */
1469
1470 static char *_pam_compose_pwd_restriction_string(struct pwb_context *ctx,
1471                                                  struct wbcUserPasswordPolicyInfo *i)
1472 {
1473         char *str = NULL;
1474
1475         if (!i) {
1476                 goto failed;
1477         }
1478
1479         str = talloc_asprintf(ctx, _("Your password "));
1480         if (!str) {
1481                 goto failed;
1482         }
1483
1484         if (i->min_length_password > 0) {
1485                 str = talloc_asprintf_append(str,
1486                                _("must be at least %d characters; "),
1487                                i->min_length_password);
1488                 if (!str) {
1489                         goto failed;
1490                 }
1491         }
1492
1493         if (i->password_history > 0) {
1494                 str = talloc_asprintf_append(str,
1495                                _("cannot repeat any of your previous %d "
1496                                 "passwords; "),
1497                                i->password_history);
1498                 if (!str) {
1499                         goto failed;
1500                 }
1501         }
1502
1503         if (i->password_properties & WBC_DOMAIN_PASSWORD_COMPLEX) {
1504                 str = talloc_asprintf_append(str,
1505                                _("must contain capitals, numerals "
1506                                  "or punctuation; "
1507                                  "and cannot contain your account "
1508                                  "or full name; "));
1509                 if (!str) {
1510                         goto failed;
1511                 }
1512         }
1513
1514         str = talloc_asprintf_append(str,
1515                        _("Please type a different password. "
1516                          "Type a password which meets these requirements in "
1517                          "both text boxes."));
1518         if (!str) {
1519                 goto failed;
1520         }
1521
1522         return str;
1523
1524  failed:
1525         TALLOC_FREE(str);
1526         return NULL;
1527 }
1528
1529 static int _pam_create_homedir(struct pwb_context *ctx,
1530                                const char *dirname,
1531                                mode_t mode)
1532 {
1533         struct stat sbuf;
1534
1535         if (stat(dirname, &sbuf) == 0) {
1536                 return PAM_SUCCESS;
1537         }
1538
1539         if (mkdir(dirname, mode) != 0) {
1540
1541                 _make_remark_format(ctx, PAM_TEXT_INFO,
1542                                     _("Creating directory: %s failed: %s"),
1543                                     dirname, strerror(errno));
1544                 _pam_log(ctx, LOG_ERR, "could not create dir: %s (%s)",
1545                  dirname, strerror(errno));
1546                  return PAM_PERM_DENIED;
1547         }
1548
1549         return PAM_SUCCESS;
1550 }
1551
1552 static int _pam_chown_homedir(struct pwb_context *ctx,
1553                               const char *dirname,
1554                               uid_t uid,
1555                               gid_t gid)
1556 {
1557         if (chown(dirname, uid, gid) != 0) {
1558                 _pam_log(ctx, LOG_ERR, "failed to chown user homedir: %s (%s)",
1559                          dirname, strerror(errno));
1560                 return PAM_PERM_DENIED;
1561         }
1562
1563         return PAM_SUCCESS;
1564 }
1565
1566 static int _pam_mkhomedir(struct pwb_context *ctx)
1567 {
1568         struct passwd *pwd = NULL;
1569         char *token = NULL;
1570         char *create_dir = NULL;
1571         char *user_dir = NULL;
1572         int ret;
1573         const char *username;
1574         mode_t mode = 0700;
1575         char *safe_ptr = NULL;
1576         char *p = NULL;
1577
1578         /* Get the username */
1579         ret = pam_get_user(ctx->pamh, &username, NULL);
1580         if ((ret != PAM_SUCCESS) || (!username)) {
1581                 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1582                 return PAM_SERVICE_ERR;
1583         }
1584
1585         pwd = getpwnam(username);
1586         if (pwd == NULL) {
1587                 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1588                 return PAM_USER_UNKNOWN;
1589         }
1590         _pam_log_debug(ctx, LOG_DEBUG, "homedir is: %s", pwd->pw_dir);
1591
1592         ret = _pam_create_homedir(ctx, pwd->pw_dir, 0700);
1593         if (ret == PAM_SUCCESS) {
1594                 ret = _pam_chown_homedir(ctx, pwd->pw_dir,
1595                                          pwd->pw_uid,
1596                                          pwd->pw_gid);
1597         }
1598
1599         if (ret == PAM_SUCCESS) {
1600                 return ret;
1601         }
1602
1603         /* maybe we need to create parent dirs */
1604         create_dir = talloc_strdup(ctx, "/");
1605         if (!create_dir) {
1606                 return PAM_BUF_ERR;
1607         }
1608
1609         /* find final directory */
1610         user_dir = strrchr(pwd->pw_dir, '/');
1611         if (!user_dir) {
1612                 return PAM_BUF_ERR;
1613         }
1614         user_dir++;
1615
1616         _pam_log(ctx, LOG_DEBUG, "final directory: %s", user_dir);
1617
1618         p = pwd->pw_dir;
1619
1620         while ((token = strtok_r(p, "/", &safe_ptr)) != NULL) {
1621
1622                 mode = 0755;
1623
1624                 p = NULL;
1625
1626                 _pam_log_debug(ctx, LOG_DEBUG, "token is %s", token);
1627
1628                 create_dir = talloc_asprintf_append(create_dir, "%s/", token);
1629                 if (!create_dir) {
1630                         return PAM_BUF_ERR;
1631                 }
1632                 _pam_log_debug(ctx, LOG_DEBUG, "current_dir is %s", create_dir);
1633
1634                 if (strcmp(token, user_dir) == 0) {
1635                         _pam_log_debug(ctx, LOG_DEBUG, "assuming last directory: %s", token);
1636                         mode = 0700;
1637                 }
1638
1639                 ret = _pam_create_homedir(ctx, create_dir, mode);
1640                 if (ret) {
1641                         return ret;
1642                 }
1643         }
1644
1645         return _pam_chown_homedir(ctx, create_dir,
1646                                   pwd->pw_uid,
1647                                   pwd->pw_gid);
1648 }
1649
1650 /* talk to winbindd */
1651 static int winbind_auth_request(struct pwb_context *ctx,
1652                                 const char *user,
1653                                 const char *pass,
1654                                 const char *member,
1655                                 const char *cctype,
1656                                 const int warn_pwd_expire,
1657                                 struct wbcAuthErrorInfo **p_error,
1658                                 struct wbcLogonUserInfo **p_info,
1659                                 struct wbcUserPasswordPolicyInfo **p_policy,
1660                                 time_t *pwd_last_set,
1661                                 char **user_ret)
1662 {
1663         wbcErr wbc_status;
1664
1665         struct wbcLogonUserParams logon;
1666         char membership_of[1024];
1667         uid_t user_uid = -1;
1668         uint32_t flags = WBFLAG_PAM_INFO3_TEXT |
1669                          WBFLAG_PAM_GET_PWD_POLICY;
1670
1671         struct wbcLogonUserInfo *info = NULL;
1672         struct wbcAuthUserInfo *user_info = NULL;
1673         struct wbcAuthErrorInfo *error = NULL;
1674         struct wbcUserPasswordPolicyInfo *policy = NULL;
1675
1676         int ret = PAM_AUTH_ERR;
1677         int i;
1678         const char *codes[] = {
1679                 "NT_STATUS_PASSWORD_EXPIRED",
1680                 "NT_STATUS_PASSWORD_MUST_CHANGE",
1681                 "NT_STATUS_INVALID_WORKSTATION",
1682                 "NT_STATUS_INVALID_LOGON_HOURS",
1683                 "NT_STATUS_ACCOUNT_EXPIRED",
1684                 "NT_STATUS_ACCOUNT_DISABLED",
1685                 "NT_STATUS_ACCOUNT_LOCKED_OUT",
1686                 "NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
1687                 "NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
1688                 "NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
1689                 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1690                 "NT_STATUS_NO_LOGON_SERVERS",
1691                 "NT_STATUS_WRONG_PASSWORD",
1692                 "NT_STATUS_ACCESS_DENIED"
1693         };
1694
1695         if (pwd_last_set) {
1696                 *pwd_last_set = 0;
1697         }
1698
1699         /* Krb5 auth always has to go against the KDC of the user's realm */
1700
1701         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1702                 flags           |= WBFLAG_PAM_CONTACT_TRUSTDOM;
1703         }
1704
1705         if (ctx->ctrl & (WINBIND_KRB5_AUTH|WINBIND_CACHED_LOGIN)) {
1706                 struct passwd *pwd = NULL;
1707
1708                 pwd = getpwnam(user);
1709                 if (pwd == NULL) {
1710                         return PAM_USER_UNKNOWN;
1711                 }
1712                 user_uid        = pwd->pw_uid;
1713         }
1714
1715         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1716
1717                 _pam_log_debug(ctx, LOG_DEBUG,
1718                                "enabling krb5 login flag\n");
1719
1720                 flags           |= WBFLAG_PAM_KRB5 |
1721                                    WBFLAG_PAM_FALLBACK_AFTER_KRB5;
1722         }
1723
1724         if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1725                 _pam_log_debug(ctx, LOG_DEBUG,
1726                                "enabling cached login flag\n");
1727                 flags           |= WBFLAG_PAM_CACHED_LOGIN;
1728         }
1729
1730         if (user_ret) {
1731                 *user_ret = NULL;
1732                 flags           |= WBFLAG_PAM_UNIX_NAME;
1733         }
1734
1735         if (cctype != NULL) {
1736                 _pam_log_debug(ctx, LOG_DEBUG,
1737                                "enabling request for a %s krb5 ccache\n",
1738                                cctype);
1739         }
1740
1741         if (member != NULL) {
1742
1743                 ZERO_STRUCT(membership_of);
1744
1745                 if (!winbind_name_list_to_sid_string_list(ctx, user, member,
1746                                                           membership_of,
1747                                                           sizeof(membership_of))) {
1748                         _pam_log_debug(ctx, LOG_ERR,
1749                                        "failed to serialize membership of sid "
1750                                        "\"%s\"\n", member);
1751                         return PAM_AUTH_ERR;
1752                 }
1753         }
1754
1755         ZERO_STRUCT(logon);
1756
1757         logon.username                  = user;
1758         logon.password                  = pass;
1759
1760         if (cctype) {
1761                 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1762                                              &logon.blobs,
1763                                              "krb5_cc_type",
1764                                              0,
1765                                              discard_const_p(uint8_t, cctype),
1766                                              strlen(cctype)+1);
1767                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1768                         goto done;
1769                 }
1770         }
1771
1772         wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1773                                      &logon.blobs,
1774                                      "flags",
1775                                      0,
1776                                      (uint8_t *)&flags,
1777                                      sizeof(flags));
1778         if (!WBC_ERROR_IS_OK(wbc_status)) {
1779                 goto done;
1780         }
1781
1782         wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1783                                      &logon.blobs,
1784                                      "user_uid",
1785                                      0,
1786                                      (uint8_t *)&user_uid,
1787                                      sizeof(user_uid));
1788         if (!WBC_ERROR_IS_OK(wbc_status)) {
1789                 goto done;
1790         }
1791
1792         if (member) {
1793                 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1794                                              &logon.blobs,
1795                                              "membership_of",
1796                                              0,
1797                                              (uint8_t *)membership_of,
1798                                              sizeof(membership_of));
1799                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1800                         goto done;
1801                 }
1802         }
1803
1804         wbc_status = wbcLogonUser(&logon, &info, &error, &policy);
1805         ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1806                                           user, "wbcLogonUser");
1807         wbcFreeMemory(logon.blobs);
1808         logon.blobs = NULL;
1809
1810         if (info && info->info) {
1811                 user_info = info->info;
1812         }
1813
1814         if (pwd_last_set && user_info) {
1815                 *pwd_last_set = user_info->pass_last_set_time;
1816         }
1817
1818         if (p_info && info) {
1819                 *p_info = info;
1820         }
1821
1822         if (p_policy && policy) {
1823                 *p_policy = policy;
1824         }
1825
1826         if (p_error && error) {
1827                 /* We want to process the error in the caller. */
1828                 *p_error = error;
1829                 return ret;
1830         }
1831
1832         for (i=0; i<ARRAY_SIZE(codes); i++) {
1833                 int _ret = ret;
1834                 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1835                         ret = _ret;
1836                         goto done;
1837                 }
1838         }
1839
1840         if ((ret == PAM_SUCCESS) && user_info && policy && info) {
1841
1842                 bool already_expired = false;
1843                 bool change_pwd = false;
1844
1845                 /* warn a user if the password is about to expire soon */
1846                 _pam_warn_password_expiry(ctx, user_info, policy,
1847                                           warn_pwd_expire,
1848                                           &already_expired,
1849                                           &change_pwd);
1850
1851                 if (already_expired == true) {
1852
1853                         SMB_TIME_T last_set = user_info->pass_last_set_time;
1854
1855                         _pam_log_debug(ctx, LOG_DEBUG,
1856                                        "Password has expired "
1857                                        "(Password was last set: %lld, "
1858                                        "the policy says it should expire here "
1859                                        "%lld (now it's: %ld))\n",
1860                                        (long long int)last_set,
1861                                        (long long int)last_set +
1862                                        policy->expire,
1863                                        (long)time(NULL));
1864
1865                         return PAM_AUTHTOK_EXPIRED;
1866                 }
1867
1868                 if (change_pwd) {
1869                         ret = PAM_NEW_AUTHTOK_REQD;
1870                         goto done;
1871                 }
1872
1873                 /* inform about logon type */
1874                 _pam_warn_logon_type(ctx, user, user_info->user_flags);
1875
1876                 /* inform about krb5 failures */
1877                 _pam_warn_krb5_failure(ctx, user, user_info->user_flags);
1878
1879                 /* set some info3 info for other modules in the stack */
1880                 _pam_set_data_info3(ctx, user_info);
1881
1882                 /* put krb5ccname into env */
1883                 _pam_setup_krb5_env(ctx, info);
1884
1885                 /* If winbindd returned a username, return the pointer to it
1886                  * here. */
1887                 _pam_setup_unix_username(ctx, user_ret, info);
1888         }
1889
1890  done:
1891         wbcFreeMemory(logon.blobs);
1892         if (info && info->blobs && !p_info) {
1893                 wbcFreeMemory(info->blobs);
1894         }
1895         if (error && !p_error) {
1896                 wbcFreeMemory(error);
1897         }
1898         if (info && !p_info) {
1899                 wbcFreeMemory(info);
1900         }
1901         if (policy && !p_policy) {
1902                 wbcFreeMemory(policy);
1903         }
1904
1905         return ret;
1906 }
1907
1908 /* talk to winbindd */
1909 static int winbind_chauthtok_request(struct pwb_context *ctx,
1910                                      const char *user,
1911                                      const char *oldpass,
1912                                      const char *newpass,
1913                                      time_t pwd_last_set)
1914 {
1915         wbcErr wbc_status;
1916         struct wbcChangePasswordParams params;
1917         struct wbcAuthErrorInfo *error = NULL;
1918         struct wbcUserPasswordPolicyInfo *policy = NULL;
1919         enum wbcPasswordChangeRejectReason reject_reason = -1;
1920         uint32_t flags = 0;
1921
1922         int i;
1923         const char *codes[] = {
1924                 "NT_STATUS_BACKUP_CONTROLLER",
1925                 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1926                 "NT_STATUS_NO_LOGON_SERVERS",
1927                 "NT_STATUS_ACCESS_DENIED",
1928                 "NT_STATUS_PWD_TOO_SHORT", /* TODO: tell the min pwd length ? */
1929                 "NT_STATUS_PWD_TOO_RECENT", /* TODO: tell the minage ? */
1930                 "NT_STATUS_PWD_HISTORY_CONFLICT" /* TODO: tell the history length ? */
1931         };
1932         int ret = PAM_AUTH_ERR;
1933
1934         ZERO_STRUCT(params);
1935
1936         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1937                 flags |= WBFLAG_PAM_KRB5 |
1938                          WBFLAG_PAM_CONTACT_TRUSTDOM;
1939         }
1940
1941         if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1942                 flags |= WBFLAG_PAM_CACHED_LOGIN;
1943         }
1944
1945         params.account_name             = user;
1946         params.level                    = WBC_AUTH_USER_LEVEL_PLAIN;
1947         params.old_password.plaintext   = oldpass;
1948         params.new_password.plaintext   = newpass;
1949         params.flags                    = flags;
1950
1951         wbc_status = wbcChangeUserPasswordEx(&params, &error, &reject_reason, &policy);
1952         ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1953                                           user, "wbcChangeUserPasswordEx");
1954
1955         if (WBC_ERROR_IS_OK(wbc_status)) {
1956                 _pam_log(ctx, LOG_NOTICE,
1957                          "user '%s' password changed", user);
1958                 return PAM_SUCCESS;
1959         }
1960
1961         if (!error) {
1962                 wbcFreeMemory(policy);
1963                 return ret;
1964         }
1965
1966         for (i=0; i<ARRAY_SIZE(codes); i++) {
1967                 int _ret = ret;
1968                 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1969                         ret = _ret;
1970                         goto done;
1971                 }
1972         }
1973
1974         if (!strcasecmp(error->nt_string,
1975                         "NT_STATUS_PASSWORD_RESTRICTION")) {
1976
1977                 char *pwd_restriction_string = NULL;
1978                 SMB_TIME_T min_pwd_age = 0;
1979
1980                 if (policy) {
1981                         min_pwd_age     = policy->min_passwordage;
1982                 }
1983
1984                 /* FIXME: avoid to send multiple PAM messages after another */
1985                 switch (reject_reason) {
1986                         case -1:
1987                                 break;
1988                         case WBC_PWD_CHANGE_NO_ERROR:
1989                                 if ((min_pwd_age > 0) &&
1990                                     (pwd_last_set + min_pwd_age > time(NULL))) {
1991                                         PAM_WB_REMARK_DIRECT(ctx,
1992                                              "NT_STATUS_PWD_TOO_RECENT");
1993                                 }
1994                                 break;
1995                         case WBC_PWD_CHANGE_PASSWORD_TOO_SHORT:
1996                                 PAM_WB_REMARK_DIRECT(ctx,
1997                                         "NT_STATUS_PWD_TOO_SHORT");
1998                                 break;
1999                         case WBC_PWD_CHANGE_PWD_IN_HISTORY:
2000                                 PAM_WB_REMARK_DIRECT(ctx,
2001                                         "NT_STATUS_PWD_HISTORY_CONFLICT");
2002                                 break;
2003                         case WBC_PWD_CHANGE_NOT_COMPLEX:
2004                                 _make_remark(ctx, PAM_ERROR_MSG,
2005                                              _("Password does not meet "
2006                                                "complexity requirements"));
2007                                 break;
2008                         default:
2009                                 _pam_log_debug(ctx, LOG_DEBUG,
2010                                                "unknown password change "
2011                                                "reject reason: %d",
2012                                                reject_reason);
2013                                 break;
2014                 }
2015
2016                 pwd_restriction_string =
2017                         _pam_compose_pwd_restriction_string(ctx, policy);
2018                 if (pwd_restriction_string) {
2019                         _make_remark(ctx, PAM_ERROR_MSG,
2020                                      pwd_restriction_string);
2021                         TALLOC_FREE(pwd_restriction_string);
2022                 }
2023         }
2024  done:
2025         wbcFreeMemory(error);
2026         wbcFreeMemory(policy);
2027
2028         return ret;
2029 }
2030
2031 /*
2032  * Checks if a user has an account
2033  *
2034  * return values:
2035  *       1  = User not found
2036  *       0  = OK
2037  *      -1  = System error
2038  */
2039 static int valid_user(struct pwb_context *ctx,
2040                       const char *user)
2041 {
2042         /* check not only if the user is available over NSS calls, also make
2043          * sure it's really a winbind user, this is important when stacking PAM
2044          * modules in the 'account' or 'password' facility. */
2045
2046         wbcErr wbc_status;
2047         struct passwd *pwd = NULL;
2048         struct passwd *wb_pwd = NULL;
2049
2050         pwd = getpwnam(user);
2051         if (pwd == NULL) {
2052                 return 1;
2053         }
2054
2055         wbc_status = wbcGetpwnam(user, &wb_pwd);
2056         wbcFreeMemory(wb_pwd);
2057         if (!WBC_ERROR_IS_OK(wbc_status)) {
2058                 _pam_log(ctx, LOG_DEBUG, "valid_user: wbcGetpwnam gave %s\n",
2059                         wbcErrorString(wbc_status));
2060         }
2061
2062         switch (wbc_status) {
2063                 case WBC_ERR_UNKNOWN_USER:
2064                         return 1;
2065                 case WBC_ERR_SUCCESS:
2066                         return 0;
2067                 default:
2068                         break;
2069         }
2070         return -1;
2071 }
2072
2073 static char *_pam_delete(register char *xx)
2074 {
2075         _pam_overwrite(xx);
2076         _pam_drop(xx);
2077         return NULL;
2078 }
2079
2080 /*
2081  * obtain a password from the user
2082  */
2083
2084 static int _winbind_read_password(struct pwb_context *ctx,
2085                                   unsigned int ctrl,
2086                                   const char *comment,
2087                                   const char *prompt1,
2088                                   const char *prompt2,
2089                                   const char **pass)
2090 {
2091         int authtok_flag;
2092         int retval;
2093         const char *item;
2094         char *token;
2095
2096         _pam_log(ctx, LOG_DEBUG, "getting password (0x%08x)", ctrl);
2097
2098         /*
2099          * make sure nothing inappropriate gets returned
2100          */
2101
2102         *pass = token = NULL;
2103
2104         /*
2105          * which authentication token are we getting?
2106          */
2107
2108         if (on(WINBIND__OLD_PASSWORD, ctrl)) {
2109                 authtok_flag = PAM_OLDAUTHTOK;
2110         } else {
2111                 authtok_flag = PAM_AUTHTOK;
2112         }
2113
2114         /*
2115          * should we obtain the password from a PAM item ?
2116          */
2117
2118         if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) ||
2119             on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2120                 retval = _pam_get_item(ctx->pamh, authtok_flag, &item);
2121                 if (retval != PAM_SUCCESS) {
2122                         /* very strange. */
2123                         _pam_log(ctx, LOG_ALERT,
2124                                  "pam_get_item returned error "
2125                                  "to unix-read-password");
2126                         return retval;
2127                 } else if (item != NULL) {      /* we have a password! */
2128                         *pass = item;
2129                         item = NULL;
2130                         _pam_log(ctx, LOG_DEBUG,
2131                                  "pam_get_item returned a password");
2132                         return PAM_SUCCESS;
2133                 } else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2134                         return PAM_AUTHTOK_RECOVER_ERR; /* didn't work */
2135                 } else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl)
2136                            && off(WINBIND__OLD_PASSWORD, ctrl)) {
2137                         return PAM_AUTHTOK_RECOVER_ERR;
2138                 }
2139         }
2140         /*
2141          * getting here implies we will have to get the password from the
2142          * user directly.
2143          */
2144
2145         {
2146                 struct pam_message msg[3], *pmsg[3];
2147                 struct pam_response *resp;
2148                 int i, replies;
2149
2150                 /* prepare to converse */
2151
2152                 if (comment != NULL && off(ctrl, WINBIND_SILENT)) {
2153                         pmsg[0] = &msg[0];
2154                         msg[0].msg_style = PAM_TEXT_INFO;
2155                         msg[0].msg = discard_const_p(char, comment);
2156                         i = 1;
2157                 } else {
2158                         i = 0;
2159                 }
2160
2161                 pmsg[i] = &msg[i];
2162                 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2163                 msg[i++].msg = discard_const_p(char, prompt1);
2164                 replies = 1;
2165
2166                 if (prompt2 != NULL) {
2167                         pmsg[i] = &msg[i];
2168                         msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2169                         msg[i++].msg = discard_const_p(char, prompt2);
2170                         ++replies;
2171                 }
2172                 /* so call the conversation expecting i responses */
2173                 resp = NULL;
2174                 retval = converse(ctx->pamh, i, pmsg, &resp);
2175                 if (resp == NULL) {
2176                         if (retval == PAM_SUCCESS) {
2177                                 retval = PAM_AUTHTOK_RECOVER_ERR;
2178                         }
2179                         goto done;
2180                 }
2181                 if (retval != PAM_SUCCESS) {
2182                         _pam_drop_reply(resp, i);
2183                         goto done;
2184                 }
2185
2186                 /* interpret the response */
2187
2188                 token = x_strdup(resp[i - replies].resp);
2189                 if (!token) {
2190                         _pam_log(ctx, LOG_NOTICE,
2191                                  "could not recover "
2192                                  "authentication token");
2193                         retval = PAM_AUTHTOK_RECOVER_ERR;
2194                         goto done;
2195                 }
2196
2197                 if (replies == 2) {
2198                         /* verify that password entered correctly */
2199                         if (!resp[i - 1].resp ||
2200                             strcmp(token, resp[i - 1].resp)) {
2201                                 _pam_delete(token);     /* mistyped */
2202                                 retval = PAM_AUTHTOK_RECOVER_ERR;
2203                                 _make_remark(ctx, PAM_ERROR_MSG,
2204                                              MISTYPED_PASS);
2205                         }
2206                 }
2207
2208                 /*
2209                  * tidy up the conversation (resp_retcode) is ignored
2210                  * -- what is it for anyway? AGM
2211                  */
2212                 _pam_drop_reply(resp, i);
2213         }
2214
2215  done:
2216         if (retval != PAM_SUCCESS) {
2217                 _pam_log_debug(ctx, LOG_DEBUG,
2218                                "unable to obtain a password");
2219                 return retval;
2220         }
2221         /* 'token' is the entered password */
2222
2223         /* we store this password as an item */
2224
2225         retval = pam_set_item(ctx->pamh, authtok_flag, token);
2226         _pam_delete(token);     /* clean it up */
2227         if (retval != PAM_SUCCESS ||
2228             (retval = _pam_get_item(ctx->pamh, authtok_flag, &item)) != PAM_SUCCESS) {
2229
2230                 _pam_log(ctx, LOG_CRIT, "error manipulating password");
2231                 return retval;
2232
2233         }
2234
2235         *pass = item;
2236         item = NULL;            /* break link to password */
2237
2238         return PAM_SUCCESS;
2239 }
2240
2241 static const char *get_conf_item_string(struct pwb_context *ctx,
2242                                         const char *item,
2243                                         int config_flag)
2244 {
2245         int i = 0;
2246         const char *parm_opt = NULL;
2247
2248         if (!(ctx->ctrl & config_flag)) {
2249                 goto out;
2250         }
2251
2252         /* let the pam opt take precedence over the pam_winbind.conf option */
2253         for (i=0; i<ctx->argc; i++) {
2254
2255                 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2256                         char *p;
2257
2258                         if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2259                                 _pam_log(ctx, LOG_INFO,
2260                                          "no \"=\" delimiter for \"%s\" found\n",
2261                                          item);
2262                                 goto out;
2263                         }
2264                         _pam_log_debug(ctx, LOG_INFO,
2265                                        "PAM config: %s '%s'\n", item, p+1);
2266                         return p + 1;
2267                 }
2268         }
2269
2270         if (ctx->dict) {
2271                 char *key = NULL;
2272
2273                 key = talloc_asprintf(ctx, "global:%s", item);
2274                 if (!key) {
2275                         goto out;
2276                 }
2277
2278                 parm_opt = iniparser_getstr(ctx->dict, key);
2279                 TALLOC_FREE(key);
2280
2281                 _pam_log_debug(ctx, LOG_INFO, "CONFIG file: %s '%s'\n",
2282                                item, parm_opt);
2283         }
2284 out:
2285         return parm_opt;
2286 }
2287
2288 static int get_config_item_int(struct pwb_context *ctx,
2289                                const char *item,
2290                                int config_flag)
2291 {
2292         int i, parm_opt = -1;
2293
2294         if (!(ctx->ctrl & config_flag)) {
2295                 goto out;
2296         }
2297
2298         /* let the pam opt take precedence over the pam_winbind.conf option */
2299         for (i = 0; i < ctx->argc; i++) {
2300
2301                 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2302                         char *p;
2303
2304                         if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2305                                 _pam_log(ctx, LOG_INFO,
2306                                          "no \"=\" delimiter for \"%s\" found\n",
2307                                          item);
2308                                 goto out;
2309                         }
2310                         parm_opt = atoi(p + 1);
2311                         _pam_log_debug(ctx, LOG_INFO,
2312                                        "PAM config: %s '%d'\n",
2313                                        item, parm_opt);
2314                         return parm_opt;
2315                 }
2316         }
2317
2318         if (ctx->dict) {
2319                 char *key = NULL;
2320
2321                 key = talloc_asprintf(ctx, "global:%s", item);
2322                 if (!key) {
2323                         goto out;
2324                 }
2325
2326                 parm_opt = iniparser_getint(ctx->dict, key, -1);
2327                 TALLOC_FREE(key);
2328
2329                 _pam_log_debug(ctx, LOG_INFO,
2330                                "CONFIG file: %s '%d'\n",
2331                                item, parm_opt);
2332         }
2333 out:
2334         return parm_opt;
2335 }
2336
2337 static const char *get_krb5_cc_type_from_config(struct pwb_context *ctx)
2338 {
2339         return get_conf_item_string(ctx, "krb5_ccache_type",
2340                                     WINBIND_KRB5_CCACHE_TYPE);
2341 }
2342
2343 static const char *get_member_from_config(struct pwb_context *ctx)
2344 {
2345         const char *ret = NULL;
2346         ret = get_conf_item_string(ctx, "require_membership_of",
2347                                    WINBIND_REQUIRED_MEMBERSHIP);
2348         if (ret) {
2349                 return ret;
2350         }
2351         return get_conf_item_string(ctx, "require-membership-of",
2352                                     WINBIND_REQUIRED_MEMBERSHIP);
2353 }
2354
2355 static int get_warn_pwd_expire_from_config(struct pwb_context *ctx)
2356 {
2357         int ret;
2358         ret = get_config_item_int(ctx, "warn_pwd_expire",
2359                                   WINBIND_WARN_PWD_EXPIRE);
2360         /* no or broken setting */
2361         if (ret <= 0) {
2362                 return DEFAULT_DAYS_TO_WARN_BEFORE_PWD_EXPIRES;
2363         }
2364         return ret;
2365 }
2366
2367 /**
2368  * Retrieve the winbind separator.
2369  *
2370  * @param ctx PAM winbind context.
2371  *
2372  * @return string separator character. NULL on failure.
2373  */
2374
2375 static char winbind_get_separator(struct pwb_context *ctx)
2376 {
2377         wbcErr wbc_status;
2378         static struct wbcInterfaceDetails *details = NULL;
2379
2380         wbc_status = wbcInterfaceDetails(&details);
2381         if (!WBC_ERROR_IS_OK(wbc_status)) {
2382                 _pam_log(ctx, LOG_ERR,
2383                          "Could not retrieve winbind interface details: %s",
2384                          wbcErrorString(wbc_status));
2385                 return '\0';
2386         }
2387
2388         if (!details) {
2389                 return '\0';
2390         }
2391
2392         return details->winbind_separator;
2393 }
2394
2395
2396 /**
2397  * Convert a upn to a name.
2398  *
2399  * @param ctx PAM winbind context.
2400  * @param upn  USer UPN to be trabslated.
2401  *
2402  * @return converted name. NULL pointer on failure. Caller needs to free.
2403  */
2404
2405 static char* winbind_upn_to_username(struct pwb_context *ctx,
2406                                      const char *upn)
2407 {
2408         char sep;
2409         wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;
2410         struct wbcDomainSid sid;
2411         enum wbcSidType type;
2412         char *domain = NULL;
2413         char *name;
2414         char *p;
2415
2416         /* This cannot work when the winbind separator = @ */
2417
2418         sep = winbind_get_separator(ctx);
2419         if (!sep || sep == '@') {
2420                 return NULL;
2421         }
2422
2423         name = talloc_strdup(ctx, upn);
2424         if (!name) {
2425                 return NULL;
2426         }
2427         if ((p = strchr(name, '@')) != NULL) {
2428                 *p = 0;
2429                 domain = p + 1;
2430         }
2431
2432         /* Convert the UPN to a SID */
2433
2434         wbc_status = wbcLookupName(domain, name, &sid, &type);
2435         if (!WBC_ERROR_IS_OK(wbc_status)) {
2436                 return NULL;
2437         }
2438
2439         /* Convert the the SID back to the sAMAccountName */
2440
2441         wbc_status = wbcLookupSid(&sid, &domain, &name, &type);
2442         if (!WBC_ERROR_IS_OK(wbc_status)) {
2443                 return NULL;
2444         }
2445
2446         return talloc_asprintf(ctx, "%s\\%s", domain, name);
2447 }
2448
2449 static int _pam_delete_cred(pam_handle_t *pamh, int flags,
2450                          int argc, const char **argv)
2451 {
2452         int retval = PAM_SUCCESS;
2453         struct pwb_context *ctx = NULL;
2454         struct wbcLogoffUserParams logoff;
2455         struct wbcAuthErrorInfo *error = NULL;
2456         const char *user;
2457         wbcErr wbc_status = WBC_ERR_SUCCESS;
2458
2459         ZERO_STRUCT(logoff);
2460
2461         retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2462         if (retval) {
2463                 goto out;
2464         }
2465
2466         _PAM_LOG_FUNCTION_ENTER("_pam_delete_cred", ctx);
2467
2468         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
2469
2470                 /* destroy the ccache here */
2471
2472                 uint32_t wbc_flags = 0;
2473                 const char *ccname = NULL;
2474                 struct passwd *pwd = NULL;
2475
2476                 retval = pam_get_user(pamh, &user, _("Username: "));
2477                 if (retval) {
2478                         _pam_log(ctx, LOG_ERR,
2479                                  "could not identify user");
2480                         goto out;
2481                 }
2482
2483                 if (user == NULL) {
2484                         _pam_log(ctx, LOG_ERR,
2485                                  "username was NULL!");
2486                         retval = PAM_USER_UNKNOWN;
2487                         goto out;
2488                 }
2489
2490                 _pam_log_debug(ctx, LOG_DEBUG,
2491                                "username [%s] obtained", user);
2492
2493                 ccname = pam_getenv(pamh, "KRB5CCNAME");
2494                 if (ccname == NULL) {
2495                         _pam_log_debug(ctx, LOG_DEBUG,
2496                                        "user has no KRB5CCNAME environment");
2497                 }
2498
2499                 pwd = getpwnam(user);
2500                 if (pwd == NULL) {
2501                         retval = PAM_USER_UNKNOWN;
2502                         goto out;
2503                 }
2504
2505                 wbc_flags = WBFLAG_PAM_KRB5 |
2506                         WBFLAG_PAM_CONTACT_TRUSTDOM;
2507
2508                 logoff.username         = user;
2509
2510                 if (ccname) {
2511                         wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2512                                                      &logoff.blobs,
2513                                                      "ccfilename",
2514                                                      0,
2515                                                      discard_const_p(uint8_t, ccname),
2516                                                      strlen(ccname)+1);
2517                         if (!WBC_ERROR_IS_OK(wbc_status)) {
2518                                 goto out;
2519                         }
2520                 }
2521
2522                 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2523                                              &logoff.blobs,
2524                                              "flags",
2525                                              0,
2526                                              (uint8_t *)&wbc_flags,
2527                                              sizeof(wbc_flags));
2528                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2529                         goto out;
2530                 }
2531
2532                 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2533                                              &logoff.blobs,
2534                                              "user_uid",
2535                                              0,
2536                                              (uint8_t *)&pwd->pw_uid,
2537                                              sizeof(pwd->pw_uid));
2538                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2539                         goto out;
2540                 }
2541
2542                 wbc_status = wbcLogoffUserEx(&logoff, &error);
2543                 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2544                                                      user, "wbcLogoffUser");
2545                 wbcFreeMemory(error);
2546                 wbcFreeMemory(logoff.blobs);
2547                 logoff.blobs = NULL;
2548
2549                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2550                         _pam_log(ctx, LOG_INFO,
2551                                  "failed to logoff user %s: %s\n",
2552                                          user, wbcErrorString(wbc_status));
2553                 }
2554         }
2555
2556 out:
2557         if (logoff.blobs) {
2558                 wbcFreeMemory(logoff.blobs);
2559         }
2560
2561         if (!WBC_ERROR_IS_OK(wbc_status)) {
2562                 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2563                      user, "wbcLogoffUser");
2564         }
2565
2566         /*
2567          * Delete the krb5 ccname variable from the PAM environment
2568          * if it was set by winbind.
2569          */
2570         if ((ctx->ctrl & WINBIND_KRB5_AUTH) && pam_getenv(pamh, "KRB5CCNAME")) {
2571                 pam_putenv(pamh, "KRB5CCNAME");
2572         }
2573
2574         _PAM_LOG_FUNCTION_LEAVE("_pam_delete_cred", ctx, retval);
2575
2576         TALLOC_FREE(ctx);
2577
2578         return retval;
2579 }
2580
2581 PAM_EXTERN
2582 int pam_sm_authenticate(pam_handle_t *pamh, int flags,
2583                         int argc, const char **argv)
2584 {
2585         const char *username;
2586         const char *password;
2587         const char *member = NULL;
2588         const char *cctype = NULL;
2589         int warn_pwd_expire;
2590         int retval = PAM_AUTH_ERR;
2591         char *username_ret = NULL;
2592         char *new_authtok_required = NULL;
2593         char *real_username = NULL;
2594         struct pwb_context *ctx = NULL;
2595
2596         retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2597         if (retval) {
2598                 goto out;
2599         }
2600
2601         _PAM_LOG_FUNCTION_ENTER("pam_sm_authenticate", ctx);
2602
2603         /* Get the username */
2604         retval = pam_get_user(pamh, &username, NULL);
2605         if ((retval != PAM_SUCCESS) || (!username)) {
2606                 _pam_log_debug(ctx, LOG_DEBUG,
2607                                "can not get the username");
2608                 retval = PAM_SERVICE_ERR;
2609                 goto out;
2610         }
2611
2612
2613 #if defined(AIX)
2614         /* Decode the user name since AIX does not support logn user
2615            names by default.  The name is encoded as _#uid.  */
2616
2617         if (username[0] == '_') {
2618                 uid_t id = atoi(&username[1]);
2619                 struct passwd *pw = NULL;
2620
2621                 if ((id!=0) && ((pw = getpwuid(id)) != NULL)) {
2622                         real_username = strdup(pw->pw_name);
2623                 }
2624         }
2625 #endif
2626
2627         if (!real_username) {
2628                 /* Just making a copy of the username we got from PAM */
2629                 if ((real_username = strdup(username)) == NULL) {
2630                         _pam_log_debug(ctx, LOG_DEBUG,
2631                                        "memory allocation failure when copying "
2632                                        "username");
2633                         retval = PAM_SERVICE_ERR;
2634                         goto out;
2635                 }
2636         }
2637
2638         /* Maybe this was a UPN */
2639
2640         if (strchr(real_username, '@') != NULL) {
2641                 char *samaccountname = NULL;
2642
2643                 samaccountname = winbind_upn_to_username(ctx,
2644                                                          real_username);
2645                 if (samaccountname) {
2646                         free(real_username);
2647                         real_username = strdup(samaccountname);
2648                 }
2649         }
2650
2651         retval = _winbind_read_password(ctx, ctx->ctrl, NULL,
2652                                         _("Password: "), NULL,
2653                                         &password);
2654
2655         if (retval != PAM_SUCCESS) {
2656                 _pam_log(ctx, LOG_ERR,
2657                          "Could not retrieve user's password");
2658                 retval = PAM_AUTHTOK_ERR;
2659                 goto out;
2660         }
2661
2662         /* Let's not give too much away in the log file */
2663
2664 #ifdef DEBUG_PASSWORD
2665         _pam_log_debug(ctx, LOG_INFO,
2666                        "Verify user '%s' with password '%s'",
2667                        real_username, password);
2668 #else
2669         _pam_log_debug(ctx, LOG_INFO,
2670                        "Verify user '%s'", real_username);
2671 #endif
2672
2673         member = get_member_from_config(ctx);
2674         cctype = get_krb5_cc_type_from_config(ctx);
2675         warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
2676
2677         /* Now use the username to look up password */
2678         retval = winbind_auth_request(ctx, real_username, password,
2679                                       member, cctype, warn_pwd_expire,
2680                                       NULL, NULL, NULL,
2681                                       NULL, &username_ret);
2682
2683         if (retval == PAM_NEW_AUTHTOK_REQD ||
2684             retval == PAM_AUTHTOK_EXPIRED) {
2685
2686                 char *new_authtok_required_during_auth = NULL;
2687
2688                 new_authtok_required = talloc_asprintf(NULL, "%d", retval);
2689                 if (!new_authtok_required) {
2690                         retval = PAM_BUF_ERR;
2691                         goto out;
2692                 }
2693
2694                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2695                              new_authtok_required,
2696                              _pam_winbind_cleanup_func);
2697
2698                 retval = PAM_SUCCESS;
2699
2700                 new_authtok_required_during_auth = talloc_asprintf(NULL, "%d", true);
2701                 if (!new_authtok_required_during_auth) {
2702                         retval = PAM_BUF_ERR;
2703                         goto out;
2704                 }
2705
2706                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2707                              new_authtok_required_during_auth,
2708                              _pam_winbind_cleanup_func);
2709
2710                 goto out;
2711         }
2712
2713 out:
2714         if (username_ret) {
2715                 pam_set_item (pamh, PAM_USER, username_ret);
2716                 _pam_log_debug(ctx, LOG_INFO,
2717                                "Returned user was '%s'", username_ret);
2718                 free(username_ret);
2719         }
2720
2721         if (real_username) {
2722                 free(real_username);
2723         }
2724
2725         if (!new_authtok_required) {
2726                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, NULL, NULL);
2727         }
2728
2729         if (retval != PAM_SUCCESS) {
2730                 _pam_free_data_info3(pamh);
2731         }
2732
2733         _PAM_LOG_FUNCTION_LEAVE("pam_sm_authenticate", ctx, retval);
2734
2735         TALLOC_FREE(ctx);
2736
2737         return retval;
2738 }
2739
2740 PAM_EXTERN
2741 int pam_sm_setcred(pam_handle_t *pamh, int flags,
2742                    int argc, const char **argv)
2743 {
2744         int ret = PAM_SYSTEM_ERR;
2745         struct pwb_context *ctx = NULL;
2746
2747         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2748         if (ret) {
2749                 goto out;
2750         }
2751
2752         _PAM_LOG_FUNCTION_ENTER("pam_sm_setcred", ctx);
2753
2754         switch (flags & ~PAM_SILENT) {
2755
2756                 case PAM_DELETE_CRED:
2757                         ret = _pam_delete_cred(pamh, flags, argc, argv);
2758                         break;
2759                 case PAM_REFRESH_CRED:
2760                         _pam_log_debug(ctx, LOG_WARNING,
2761                                        "PAM_REFRESH_CRED not implemented");
2762                         ret = PAM_SUCCESS;
2763                         break;
2764                 case PAM_REINITIALIZE_CRED:
2765                         _pam_log_debug(ctx, LOG_WARNING,
2766                                        "PAM_REINITIALIZE_CRED not implemented");
2767                         ret = PAM_SUCCESS;
2768                         break;
2769                 case PAM_ESTABLISH_CRED:
2770                         _pam_log_debug(ctx, LOG_WARNING,
2771                                        "PAM_ESTABLISH_CRED not implemented");
2772                         ret = PAM_SUCCESS;
2773                         break;
2774                 default:
2775                         ret = PAM_SYSTEM_ERR;
2776                         break;
2777         }
2778
2779  out:
2780
2781         _PAM_LOG_FUNCTION_LEAVE("pam_sm_setcred", ctx, ret);
2782
2783         TALLOC_FREE(ctx);
2784
2785         return ret;
2786 }
2787
2788 /*
2789  * Account management. We want to verify that the account exists
2790  * before returning PAM_SUCCESS
2791  */
2792 PAM_EXTERN
2793 int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
2794                    int argc, const char **argv)
2795 {
2796         const char *username;
2797         int ret = PAM_USER_UNKNOWN;
2798         void *tmp = NULL;
2799         struct pwb_context *ctx = NULL;
2800
2801         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2802         if (ret) {
2803                 goto out;
2804         }
2805
2806         _PAM_LOG_FUNCTION_ENTER("pam_sm_acct_mgmt", ctx);
2807
2808
2809         /* Get the username */
2810         ret = pam_get_user(pamh, &username, NULL);
2811         if ((ret != PAM_SUCCESS) || (!username)) {
2812                 _pam_log_debug(ctx, LOG_DEBUG,
2813                                "can not get the username");
2814                 ret = PAM_SERVICE_ERR;
2815                 goto out;
2816         }
2817
2818         /* Verify the username */
2819         ret = valid_user(ctx, username);
2820         switch (ret) {
2821         case -1:
2822                 /* some sort of system error. The log was already printed */
2823                 ret = PAM_SERVICE_ERR;
2824                 goto out;
2825         case 1:
2826                 /* the user does not exist */
2827                 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
2828                                username);
2829                 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
2830                         ret = PAM_IGNORE;
2831                         goto out;
2832                 }
2833                 ret = PAM_USER_UNKNOWN;
2834                 goto out;
2835         case 0:
2836                 pam_get_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2837                              (const void **)&tmp);
2838                 if (tmp != NULL) {
2839                         ret = atoi((const char *)tmp);
2840                         switch (ret) {
2841                         case PAM_AUTHTOK_EXPIRED:
2842                                 /* fall through, since new token is required in this case */
2843                         case PAM_NEW_AUTHTOK_REQD:
2844                                 _pam_log(ctx, LOG_WARNING,
2845                                          "pam_sm_acct_mgmt success but %s is set",
2846                                          PAM_WINBIND_NEW_AUTHTOK_REQD);
2847                                 _pam_log(ctx, LOG_NOTICE,
2848                                          "user '%s' needs new password",
2849                                          username);
2850                                 /* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */
2851                                 ret = PAM_NEW_AUTHTOK_REQD;
2852                                 goto out;
2853                         default:
2854                                 _pam_log(ctx, LOG_WARNING,
2855                                          "pam_sm_acct_mgmt success");
2856                                 _pam_log(ctx, LOG_NOTICE,
2857                                          "user '%s' granted access", username);
2858                                 ret = PAM_SUCCESS;
2859                                 goto out;
2860                         }
2861                 }
2862
2863                 /* Otherwise, the authentication looked good */
2864                 _pam_log(ctx, LOG_NOTICE,
2865                          "user '%s' granted access", username);
2866                 ret = PAM_SUCCESS;
2867                 goto out;
2868         default:
2869                 /* we don't know anything about this return value */
2870                 _pam_log(ctx, LOG_ERR,
2871                          "internal module error (ret = %d, user = '%s')",
2872                          ret, username);
2873                 ret = PAM_SERVICE_ERR;
2874                 goto out;
2875         }
2876
2877         /* should not be reached */
2878         ret = PAM_IGNORE;
2879
2880  out:
2881
2882         _PAM_LOG_FUNCTION_LEAVE("pam_sm_acct_mgmt", ctx, ret);
2883
2884         TALLOC_FREE(ctx);
2885
2886         return ret;
2887 }
2888
2889 PAM_EXTERN
2890 int pam_sm_open_session(pam_handle_t *pamh, int flags,
2891                         int argc, const char **argv)
2892 {
2893         int ret = PAM_SUCCESS;
2894         struct pwb_context *ctx = NULL;
2895
2896         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2897         if (ret) {
2898                 goto out;
2899         }
2900
2901         _PAM_LOG_FUNCTION_ENTER("pam_sm_open_session", ctx);
2902
2903         if (ctx->ctrl & WINBIND_MKHOMEDIR) {
2904                 /* check and create homedir */
2905                 ret = _pam_mkhomedir(ctx);
2906         }
2907  out:
2908         _PAM_LOG_FUNCTION_LEAVE("pam_sm_open_session", ctx, ret);
2909
2910         TALLOC_FREE(ctx);
2911
2912         return ret;
2913 }
2914
2915 PAM_EXTERN
2916 int pam_sm_close_session(pam_handle_t *pamh, int flags,
2917                          int argc, const char **argv)
2918 {
2919         int ret = PAM_SUCCESS;
2920         struct pwb_context *ctx = NULL;
2921
2922         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2923         if (ret) {
2924                 goto out;
2925         }
2926
2927         _PAM_LOG_FUNCTION_ENTER("pam_sm_close_session", ctx);
2928
2929 out:
2930         _PAM_LOG_FUNCTION_LEAVE("pam_sm_close_session", ctx, ret);
2931
2932         TALLOC_FREE(ctx);
2933
2934         return ret;
2935 }
2936
2937 /**
2938  * evaluate whether we need to re-authenticate with kerberos after a
2939  * password change
2940  *
2941  * @param ctx PAM winbind context.
2942  * @param user The username
2943  *
2944  * @return boolean Returns true if required, false if not.
2945  */
2946
2947 static bool _pam_require_krb5_auth_after_chauthtok(struct pwb_context *ctx,
2948                                                    const char *user)
2949 {
2950
2951         /* Make sure that we only do this if a) the chauthtok got initiated
2952          * during a logon attempt (authenticate->acct_mgmt->chauthtok) b) any
2953          * later password change via the "passwd" command if done by the user
2954          * itself
2955          * NB. If we login from gdm or xdm and the password expires,
2956          * we change the password, but there is no memory cache.
2957          * Thus, even for passthrough login, we should do the
2958          * authentication again to update memory cache.
2959          * --- BoYang
2960          * */
2961
2962         char *new_authtok_reqd_during_auth = NULL;
2963         struct passwd *pwd = NULL;
2964
2965         _pam_get_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2966                       &new_authtok_reqd_during_auth);
2967         pam_set_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2968                      NULL, NULL);
2969
2970         if (new_authtok_reqd_during_auth) {
2971                 return true;
2972         }
2973
2974         pwd = getpwnam(user);
2975         if (!pwd) {
2976                 return false;
2977         }
2978
2979         if (getuid() == pwd->pw_uid) {
2980                 return true;
2981         }
2982
2983         return false;
2984 }
2985
2986
2987 PAM_EXTERN
2988 int pam_sm_chauthtok(pam_handle_t * pamh, int flags,
2989                      int argc, const char **argv)
2990 {
2991         unsigned int lctrl;
2992         int ret;
2993         bool cached_login = false;
2994
2995         /* <DO NOT free() THESE> */
2996         const char *user;
2997         char *pass_old, *pass_new;
2998         /* </DO NOT free() THESE> */
2999
3000         char *Announce;
3001
3002         int retry = 0;
3003         char *username_ret = NULL;
3004         struct wbcAuthErrorInfo *error = NULL;
3005         struct pwb_context *ctx = NULL;
3006
3007         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
3008         if (ret) {
3009                 goto out;
3010         }
3011
3012         _PAM_LOG_FUNCTION_ENTER("pam_sm_chauthtok", ctx);
3013
3014         cached_login = (ctx->ctrl & WINBIND_CACHED_LOGIN);
3015
3016         /* clearing offline bit for auth */
3017         ctx->ctrl &= ~WINBIND_CACHED_LOGIN;
3018
3019         /*
3020          * First get the name of a user
3021          */
3022         ret = pam_get_user(pamh, &user, _("Username: "));
3023         if (ret) {
3024                 _pam_log(ctx, LOG_ERR,
3025                          "password - could not identify user");
3026                 goto out;
3027         }
3028
3029         if (user == NULL) {
3030                 _pam_log(ctx, LOG_ERR, "username was NULL!");
3031                 ret = PAM_USER_UNKNOWN;
3032                 goto out;
3033         }
3034
3035         _pam_log_debug(ctx, LOG_DEBUG, "username [%s] obtained", user);
3036
3037         /* check if this is really a user in winbindd, not only in NSS */
3038         ret = valid_user(ctx, user);
3039         switch (ret) {
3040                 case 1:
3041                         ret = PAM_USER_UNKNOWN;
3042                         goto out;
3043                 case -1:
3044                         ret = PAM_SYSTEM_ERR;
3045                         goto out;
3046                 default:
3047                         break;
3048         }
3049
3050         /*
3051          * obtain and verify the current password (OLDAUTHTOK) for
3052          * the user.
3053          */
3054
3055         if (flags & PAM_PRELIM_CHECK) {
3056                 time_t pwdlastset_prelim = 0;
3057
3058                 /* instruct user what is happening */
3059
3060 #define greeting _("Changing password for")
3061                 Announce = talloc_asprintf(ctx, "%s %s", greeting, user);
3062                 if (!Announce) {
3063                         _pam_log(ctx, LOG_CRIT,
3064                                  "password - out of memory");
3065                         ret = PAM_BUF_ERR;
3066                         goto out;
3067                 }
3068 #undef greeting
3069
3070                 lctrl = ctx->ctrl | WINBIND__OLD_PASSWORD;
3071                 ret = _winbind_read_password(ctx, lctrl,
3072                                                 Announce,
3073                                                 _("(current) NT password: "),
3074                                                 NULL,
3075                                                 (const char **) &pass_old);
3076                 TALLOC_FREE(Announce);
3077                 if (ret != PAM_SUCCESS) {
3078                         _pam_log(ctx, LOG_NOTICE,
3079                                  "password - (old) token not obtained");
3080                         goto out;
3081                 }
3082
3083                 /* verify that this is the password for this user */
3084
3085                 ret = winbind_auth_request(ctx, user, pass_old,
3086                                            NULL, NULL, 0,
3087                                            &error, NULL, NULL,
3088                                            &pwdlastset_prelim, NULL);
3089
3090                 if (ret != PAM_ACCT_EXPIRED &&
3091                     ret != PAM_AUTHTOK_EXPIRED &&
3092                     ret != PAM_NEW_AUTHTOK_REQD &&
3093                     ret != PAM_SUCCESS) {
3094                         pass_old = NULL;
3095                         goto out;
3096                 }
3097
3098                 pam_set_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3099                              (void *)pwdlastset_prelim, NULL);
3100
3101                 ret = pam_set_item(pamh, PAM_OLDAUTHTOK,
3102                                    (const void *) pass_old);
3103                 pass_old = NULL;
3104                 if (ret != PAM_SUCCESS) {
3105                         _pam_log(ctx, LOG_CRIT,
3106                                  "failed to set PAM_OLDAUTHTOK");
3107                 }
3108         } else if (flags & PAM_UPDATE_AUTHTOK) {
3109
3110                 time_t pwdlastset_update = 0;
3111
3112                 /*
3113                  * obtain the proposed password
3114                  */
3115
3116                 /*
3117                  * get the old token back.
3118                  */
3119
3120                 ret = _pam_get_item(pamh, PAM_OLDAUTHTOK, &pass_old);
3121
3122                 if (ret != PAM_SUCCESS) {
3123                         _pam_log(ctx, LOG_NOTICE,
3124                                  "user not authenticated");
3125                         goto out;
3126                 }
3127
3128                 lctrl = ctx->ctrl & ~WINBIND_TRY_FIRST_PASS_ARG;
3129
3130                 if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) {
3131                         lctrl |= WINBIND_USE_FIRST_PASS_ARG;
3132                 }
3133                 retry = 0;
3134                 ret = PAM_AUTHTOK_ERR;
3135                 while ((ret != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) {
3136                         /*
3137                          * use_authtok is to force the use of a previously entered
3138                          * password -- needed for pluggable password strength checking
3139                          */
3140
3141                         ret = _winbind_read_password(ctx, lctrl,
3142                                                      NULL,
3143                                                      _("Enter new NT password: "),
3144                                                      _("Retype new NT password: "),
3145                                                      (const char **)&pass_new);
3146
3147                         if (ret != PAM_SUCCESS) {
3148                                 _pam_log_debug(ctx, LOG_ALERT,
3149                                                "password - "
3150                                                "new password not obtained");
3151                                 pass_old = NULL;/* tidy up */
3152                                 goto out;
3153                         }
3154
3155                         /*
3156                          * At this point we know who the user is and what they
3157                          * propose as their new password. Verify that the new
3158                          * password is acceptable.
3159                          */
3160
3161                         if (pass_new[0] == '\0') {/* "\0" password = NULL */
3162                                 pass_new = NULL;
3163                         }
3164                 }
3165
3166                 /*
3167                  * By reaching here we have approved the passwords and must now
3168                  * rebuild the password database file.
3169                  */
3170                 _pam_get_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3171                               &pwdlastset_update);
3172
3173                 /*
3174                  * if cached creds were enabled, make sure to set the
3175                  * WINBIND_CACHED_LOGIN bit here in order to have winbindd
3176                  * update the cached creds storage - gd
3177                  */
3178                 if (cached_login) {
3179                         ctx->ctrl |= WINBIND_CACHED_LOGIN;
3180                 }
3181
3182                 ret = winbind_chauthtok_request(ctx, user, pass_old,
3183                                                 pass_new, pwdlastset_update);
3184                 if (ret) {
3185                         pass_old = pass_new = NULL;
3186                         goto out;
3187                 }
3188
3189                 if (_pam_require_krb5_auth_after_chauthtok(ctx, user)) {
3190
3191                         const char *member = NULL;
3192                         const char *cctype = NULL;
3193                         int warn_pwd_expire;
3194                         struct wbcLogonUserInfo *info = NULL;
3195                         struct wbcUserPasswordPolicyInfo *policy = NULL;
3196
3197                         member = get_member_from_config(ctx);
3198                         cctype = get_krb5_cc_type_from_config(ctx);
3199                         warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
3200
3201                         /* Keep WINBIND_CACHED_LOGIN bit for
3202                          * authentication after changing the password.
3203                          * This will update the cached credentials in case
3204                          * that winbindd_dual_pam_chauthtok() fails
3205                          * to update them.
3206                          * --- BoYang
3207                          * */
3208
3209                         ret = winbind_auth_request(ctx, user, pass_new,
3210                                                    member, cctype, 0,
3211                                                    &error, &info, &policy,
3212                                                    NULL, &username_ret);
3213                         pass_old = pass_new = NULL;
3214
3215                         if (ret == PAM_SUCCESS) {
3216
3217                                 struct wbcAuthUserInfo *user_info = NULL;
3218
3219                                 if (info && info->info) {
3220                                         user_info = info->info;
3221                                 }
3222
3223                                 /* warn a user if the password is about to
3224                                  * expire soon */
3225                                 _pam_warn_password_expiry(ctx, user_info, policy,
3226                                                           warn_pwd_expire,
3227                                                           NULL, NULL);
3228
3229                                 /* set some info3 info for other modules in the
3230                                  * stack */
3231                                 _pam_set_data_info3(ctx, user_info);
3232
3233                                 /* put krb5ccname into env */
3234                                 _pam_setup_krb5_env(ctx, info);
3235
3236                                 if (username_ret) {
3237                                         pam_set_item(pamh, PAM_USER,
3238                                                      username_ret);
3239                                         _pam_log_debug(ctx, LOG_INFO,
3240                                                        "Returned user was '%s'",
3241                                                        username_ret);
3242                                         free(username_ret);
3243                                 }
3244
3245                         }
3246
3247                         if (info && info->blobs) {
3248                                 wbcFreeMemory(info->blobs);
3249                         }
3250                         wbcFreeMemory(info);
3251                         wbcFreeMemory(policy);
3252
3253                         goto out;
3254                 }
3255         } else {
3256                 ret = PAM_SERVICE_ERR;
3257         }
3258
3259 out:
3260         {
3261                 /* Deal with offline errors. */
3262                 int i;
3263                 const char *codes[] = {
3264                         "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
3265                         "NT_STATUS_NO_LOGON_SERVERS",
3266                         "NT_STATUS_ACCESS_DENIED"
3267                 };
3268
3269                 for (i=0; i<ARRAY_SIZE(codes); i++) {
3270                         int _ret;
3271                         if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
3272                                 break;
3273                         }
3274                 }
3275         }
3276
3277         wbcFreeMemory(error);
3278
3279         _PAM_LOG_FUNCTION_LEAVE("pam_sm_chauthtok", ctx, ret);
3280
3281         TALLOC_FREE(ctx);
3282
3283         return ret;
3284 }
3285
3286 #ifdef PAM_STATIC
3287
3288 /* static module data */
3289
3290 struct pam_module _pam_winbind_modstruct = {
3291         MODULE_NAME,
3292         pam_sm_authenticate,
3293         pam_sm_setcred,
3294         pam_sm_acct_mgmt,
3295         pam_sm_open_session,
3296         pam_sm_close_session,
3297         pam_sm_chauthtok
3298 };
3299
3300 #endif
3301
3302 /*
3303  * Copyright (c) Andrew Tridgell  <tridge@samba.org>   2000
3304  * Copyright (c) Tim Potter       <tpot@samba.org>     2000
3305  * Copyright (c) Andrew Bartlettt <abartlet@samba.org> 2002
3306  * Copyright (c) Guenther Deschner <gd@samba.org>      2005-2008
3307  * Copyright (c) Jan Rêkorajski 1999.
3308  * Copyright (c) Andrew G. Morgan 1996-8.
3309  * Copyright (c) Alex O. Yuriev, 1996.
3310  * Copyright (c) Cristian Gafton 1996.
3311  * Copyright (C) Elliot Lee <sopwith@redhat.com> 1996, Red Hat Software.
3312  *
3313  * Redistribution and use in source and binary forms, with or without
3314  * modification, are permitted provided that the following conditions
3315  * are met:
3316  * 1. Redistributions of source code must retain the above copyright
3317  *    notice, and the entire permission notice in its entirety,
3318  *    including the disclaimer of warranties.
3319  * 2. Redistributions in binary form must reproduce the above copyright
3320  *    notice, this list of conditions and the following disclaimer in the
3321  *    documentation and/or other materials provided with the distribution.
3322  * 3. The name of the author may not be used to endorse or promote
3323  *    products derived from this software without specific prior
3324  *    written permission.
3325  *
3326  * ALTERNATIVELY, this product may be distributed under the terms of
3327  * the GNU Public License, in which case the provisions of the GPL are
3328  * required INSTEAD OF the above restrictions.  (This clause is
3329  * necessary due to a potential bad interaction between the GPL and
3330  * the restrictions contained in a BSD-style copyright.)
3331  *
3332  * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
3333  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
3334  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
3335  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
3336  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
3337  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
3338  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
3339  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
3340  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
3341  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
3342  * OF THE POSSIBILITY OF SUCH DAMAGE.
3343  */