source: trunk-3.0/source/nsswitch/pam_winbind.c@ 103

Last change on this file since 103 was 30, checked in by Paul Smedley, 19 years ago

Code updated to Samba 3.0.25rc2 level
File size: 61.5 KB
Line 
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> 2005-2007
7
8 largely based on pam_userdb by Cristian Gafton <gafton@redhat.com>
9 also contains large slabs of code from pam_unix by Elliot Lee <sopwith@redhat.com>
10 (see copyright below for full details)
11*/
12
13#include "pam_winbind.h"
14
15#define _PAM_LOG_FUNCTION_ENTER(function, pamh, ctrl, flags) \
16 do { \
17 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "[pamh: 0x%08x] ENTER: " function " (flags: 0x%04x)", (uint32) pamh, flags); \
18 _pam_log_state(pamh, ctrl); \
19 } while (0)
20
21#define _PAM_LOG_FUNCTION_LEAVE(function, pamh, ctrl, retval) \
22 do { \
23 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "[pamh: 0x%08x] LEAVE: " function " returning %d", (uint32) pamh, retval); \
24 _pam_log_state(pamh, ctrl); \
25 } while (0)
26
27/* data tokens */
28
29#define MAX_PASSWD_TRIES 3
30
31/*
32 * Work around the pam API that has functions with void ** as parameters.
33 * These lead to strict aliasing warnings with gcc.
34 */
35static int _pam_get_item(const pam_handle_t *pamh, int item_type,
36 const void *_item)
37{
38 const void **item = (const void **)_item;
39 return pam_get_item(pamh, item_type, item);
40}
41static int _pam_get_data(const pam_handle_t *pamh,
42 const char *module_data_name, const void *_data)
43{
44 const void **data = (const void **)_data;
45 return pam_get_data(pamh, module_data_name, data);
46}
47
48/* some syslogging */
49
50#ifdef HAVE_PAM_VSYSLOG
51static void _pam_log_int(const pam_handle_t *pamh, int err, const char *format, va_list args)
52{
53 pam_vsyslog(pamh, err, format, args);
54}
55#else
56static void _pam_log_int(const pam_handle_t *pamh, int err, const char *format, va_list args)
57{
58 char *format2 = NULL;
59 const char *service;
60
61 _pam_get_item(pamh, PAM_SERVICE, &service);
62
63 format2 = malloc(strlen(MODULE_NAME)+strlen(format)+strlen(service)+5);
64 if (format2 == NULL) {
65 /* what else todo ? */
66 vsyslog(err, format, args);
67 return;
68 }
69
70 sprintf(format2, "%s(%s): %s", MODULE_NAME, service, format);
71 vsyslog(err, format2, args);
72 SAFE_FREE(format2);
73}
74#endif /* HAVE_PAM_VSYSLOG */
75
76static BOOL _pam_log_is_silent(int ctrl)
77{
78 return on(ctrl, WINBIND_SILENT);
79}
80
81static void _pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
82static void _pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
83{
84 va_list args;
85
86 if (_pam_log_is_silent(ctrl)) {
87 return;
88 }
89
90 va_start(args, format);
91 _pam_log_int(pamh, err, format, args);
92 va_end(args);
93}
94
95static BOOL _pam_log_is_debug_enabled(int ctrl)
96{
97 if (ctrl == -1) {
98 return False;
99 }
100
101 if (_pam_log_is_silent(ctrl)) {
102 return False;
103 }
104
105 if (!(ctrl & WINBIND_DEBUG_ARG)) {
106 return False;
107 }
108
109 return True;
110}
111
112static BOOL _pam_log_is_debug_state_enabled(int ctrl)
113{
114 if (!(ctrl & WINBIND_DEBUG_STATE)) {
115 return False;
116 }
117
118 return _pam_log_is_debug_enabled(ctrl);
119}
120
121static void _pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
122static void _pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
123{
124 va_list args;
125
126 if (!_pam_log_is_debug_enabled(ctrl)) {
127 return;
128 }
129
130 va_start(args, format);
131 _pam_log_int(pamh, err, format, args);
132 va_end(args);
133}
134
135static void _pam_log_state_datum(const pam_handle_t *pamh, int ctrl, int item_type, const char *key, int is_string)
136{
137 const void *data = NULL;
138 if (item_type != 0) {
139 pam_get_item(pamh, item_type, &data);
140 } else {
141 pam_get_data(pamh, key, &data);
142 }
143 if (data != NULL) {
144 const char *type = (item_type != 0) ? "ITEM" : "DATA";
145 if (is_string != 0) {
146 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "[pamh: 0x%08x] STATE: %s(%s) = \"%s\" (0x%08x)", (uint32) pamh, type, key, (const char *) data, (uint32) data);
147 } else {
148 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "[pamh: 0x%08x] STATE: %s(%s) = 0x%08x", (uint32) pamh, type, key, (uint32) data);
149 }
150 }
151}
152
153#define _PAM_LOG_STATE_DATA_POINTER(pamh, ctrl, module_data_name) \
154 _pam_log_state_datum(pamh, ctrl, 0, module_data_name, 0)
155
156#define _PAM_LOG_STATE_DATA_STRING(pamh, ctrl, module_data_name) \
157 _pam_log_state_datum(pamh, ctrl, 0, module_data_name, 1)
158
159#define _PAM_LOG_STATE_ITEM_POINTER(pamh, ctrl, item_type) \
160 _pam_log_state_datum(pamh, ctrl, item_type, #item_type, 0)
161
162#define _PAM_LOG_STATE_ITEM_STRING(pamh, ctrl, item_type) \
163 _pam_log_state_datum(pamh, ctrl, item_type, #item_type, 1)
164
165#ifdef DEBUG_PASSWORD
166#define _LOG_PASSWORD_AS_STRING 1
167#else
168#define _LOG_PASSWORD_AS_STRING 0
169#endif
170
171#define _PAM_LOG_STATE_ITEM_PASSWORD(pamh, ctrl, item_type) \
172 _pam_log_state_datum(pamh, ctrl, item_type, #item_type, _LOG_PASSWORD_AS_STRING)
173
174static void _pam_log_state(const pam_handle_t *pamh, int ctrl)
175{
176 if (!_pam_log_is_debug_state_enabled(ctrl)) {
177 return;
178 }
179
180 _PAM_LOG_STATE_ITEM_STRING(pamh, ctrl, PAM_SERVICE);
181 _PAM_LOG_STATE_ITEM_STRING(pamh, ctrl, PAM_USER);
182 _PAM_LOG_STATE_ITEM_STRING(pamh, ctrl, PAM_TTY);
183 _PAM_LOG_STATE_ITEM_STRING(pamh, ctrl, PAM_RHOST);
184 _PAM_LOG_STATE_ITEM_STRING(pamh, ctrl, PAM_RUSER);
185 _PAM_LOG_STATE_ITEM_PASSWORD(pamh, ctrl, PAM_OLDAUTHTOK);
186 _PAM_LOG_STATE_ITEM_PASSWORD(pamh, ctrl, PAM_AUTHTOK);
187 _PAM_LOG_STATE_ITEM_STRING(pamh, ctrl, PAM_USER_PROMPT);
188 _PAM_LOG_STATE_ITEM_POINTER(pamh, ctrl, PAM_CONV);
189#ifdef PAM_FAIL_DELAY
190 _PAM_LOG_STATE_ITEM_POINTER(pamh, ctrl, PAM_FAIL_DELAY);
191#endif
192#ifdef PAM_REPOSITORY
193 _PAM_LOG_STATE_ITEM_POINTER(pamh, ctrl, PAM_REPOSITORY);
194#endif
195
196 _PAM_LOG_STATE_DATA_STRING(pamh, ctrl, PAM_WINBIND_HOMEDIR);
197 _PAM_LOG_STATE_DATA_STRING(pamh, ctrl, PAM_WINBIND_LOGONSCRIPT);
198 _PAM_LOG_STATE_DATA_STRING(pamh, ctrl, PAM_WINBIND_LOGONSERVER);
199 _PAM_LOG_STATE_DATA_STRING(pamh, ctrl, PAM_WINBIND_PROFILEPATH);
200 _PAM_LOG_STATE_DATA_STRING(pamh, ctrl, PAM_WINBIND_NEW_AUTHTOK_REQD); /* Use atoi to get PAM result code */
201 _PAM_LOG_STATE_DATA_STRING(pamh, ctrl, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH);
202 _PAM_LOG_STATE_DATA_POINTER(pamh, ctrl, PAM_WINBIND_PWD_LAST_SET);
203}
204
205static int _pam_parse(const pam_handle_t *pamh, int flags, int argc, const char **argv, dictionary **result_d)
206{
207 int ctrl = 0;
208 const char *config_file = NULL;
209 int i;
210 const char **v;
211 dictionary *d = NULL;
212
213 if (flags & PAM_SILENT) {
214 ctrl |= WINBIND_SILENT;
215 }
216
217 for (i=argc,v=argv; i-- > 0; ++v) {
218 if (!strncasecmp(*v, "config", strlen("config"))) {
219 ctrl |= WINBIND_CONFIG_FILE;
220 config_file = v[i];
221 break;
222 }
223 }
224
225 if (config_file == NULL) {
226 config_file = PAM_WINBIND_CONFIG_FILE;
227 }
228
229 d = iniparser_load(config_file);
230 if (d == NULL) {
231 goto config_from_pam;
232 }
233
234 if (iniparser_getboolean(d, "global:debug", False)) {
235 ctrl |= WINBIND_DEBUG_ARG;
236 }
237
238 if (iniparser_getboolean(d, "global:debug_state", False)) {
239 ctrl |= WINBIND_DEBUG_STATE;
240 }
241
242 if (iniparser_getboolean(d, "global:cached_login", False)) {
243 ctrl |= WINBIND_CACHED_LOGIN;
244 }
245
246 if (iniparser_getboolean(d, "global:krb5_auth", False)) {
247 ctrl |= WINBIND_KRB5_AUTH;
248 }
249
250 if (iniparser_getboolean(d, "global:silent", False)) {
251 ctrl |= WINBIND_SILENT;
252 }
253
254 if (iniparser_getstr(d, "global:krb5_ccache_type") != NULL) {
255 ctrl |= WINBIND_KRB5_CCACHE_TYPE;
256 }
257
258 if ((iniparser_getstr(d, "global:require-membership-of") != NULL) ||
259 (iniparser_getstr(d, "global:require_membership_of") != NULL)) {
260 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
261 }
262
263 if (iniparser_getboolean(d, "global:try_first_pass", False)) {
264 ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
265 }
266
267config_from_pam:
268 /* step through arguments */
269 for (i=argc,v=argv; i-- > 0; ++v) {
270
271 /* generic options */
272 if (!strcmp(*v,"debug"))
273 ctrl |= WINBIND_DEBUG_ARG;
274 else if (!strcasecmp(*v, "debug_state"))
275 ctrl |= WINBIND_DEBUG_STATE;
276 else if (!strcasecmp(*v, "use_authtok"))
277 ctrl |= WINBIND_USE_AUTHTOK_ARG;
278 else if (!strcasecmp(*v, "use_first_pass"))
279 ctrl |= WINBIND_USE_FIRST_PASS_ARG;
280 else if (!strcasecmp(*v, "try_first_pass"))
281 ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
282 else if (!strcasecmp(*v, "unknown_ok"))
283 ctrl |= WINBIND_UNKNOWN_OK_ARG;
284 else if (!strncasecmp(*v, "require_membership_of", strlen("require_membership_of")))
285 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
286 else if (!strncasecmp(*v, "require-membership-of", strlen("require-membership-of")))
287 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
288 else if (!strcasecmp(*v, "krb5_auth"))
289 ctrl |= WINBIND_KRB5_AUTH;
290 else if (!strncasecmp(*v, "krb5_ccache_type", strlen("krb5_ccache_type")))
291 ctrl |= WINBIND_KRB5_CCACHE_TYPE;
292 else if (!strcasecmp(*v, "cached_login"))
293 ctrl |= WINBIND_CACHED_LOGIN;
294 else {
295 _pam_log(pamh, ctrl, LOG_ERR, "pam_parse: unknown option: %s", *v);
296 return -1;
297 }
298
299 }
300
301 if (result_d) {
302 *result_d = d;
303 } else {
304 if (d) {
305 iniparser_freedict(d);
306 }
307 }
308
309 return ctrl;
310};
311
312static void _pam_winbind_cleanup_func(pam_handle_t *pamh, void *data, int error_status)
313{
314 int ctrl = _pam_parse(pamh, 0, 0, NULL, NULL);
315 if (_pam_log_is_debug_state_enabled(ctrl)) {
316 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "[pamh: 0x%08x] CLEAN: cleaning up PAM data 0x%08x (error_status = %d)", (uint32) pamh, (uint32) data, error_status);
317 }
318 SAFE_FREE(data);
319}
320
321
322static const struct ntstatus_errors {
323 const char *ntstatus_string;
324 const char *error_string;
325} ntstatus_errors[] = {
326 {"NT_STATUS_OK", "Success"},
327 {"NT_STATUS_BACKUP_CONTROLLER", "No primary Domain Controler available"},
328 {"NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND", "No domain controllers found"},
329 {"NT_STATUS_NO_LOGON_SERVERS", "No logon servers"},
330 {"NT_STATUS_PWD_TOO_SHORT", "Password too short"},
331 {"NT_STATUS_PWD_TOO_RECENT", "The password of this user is too recent to change"},
332 {"NT_STATUS_PWD_HISTORY_CONFLICT", "Password is already in password history"},
333 {"NT_STATUS_PASSWORD_EXPIRED", "Your password has expired"},
334 {"NT_STATUS_PASSWORD_MUST_CHANGE", "You need to change your password now"},
335 {"NT_STATUS_INVALID_WORKSTATION", "You are not allowed to logon from this workstation"},
336 {"NT_STATUS_INVALID_LOGON_HOURS", "You are not allowed to logon at this time"},
337 {"NT_STATUS_ACCOUNT_EXPIRED", "Your account has expired. Please contact your System administrator"}, /* SCNR */
338 {"NT_STATUS_ACCOUNT_DISABLED", "Your account is disabled. Please contact your System administrator"}, /* SCNR */
339 {"NT_STATUS_ACCOUNT_LOCKED_OUT", "Your account has been locked. Please contact your System administrator"}, /* SCNR */
340 {"NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT", "Invalid Trust Account"},
341 {"NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT", "Invalid Trust Account"},
342 {"NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT", "Invalid Trust Account"},
343 {"NT_STATUS_ACCESS_DENIED", "Access is denied"},
344 {NULL, NULL}
345};
346
347const char *_get_ntstatus_error_string(const char *nt_status_string)
348{
349 int i;
350 for (i=0; ntstatus_errors[i].ntstatus_string != NULL; i++) {
351 if (!strcasecmp(ntstatus_errors[i].ntstatus_string, nt_status_string)) {
352 return ntstatus_errors[i].error_string;
353 }
354 }
355 return NULL;
356}
357
358/* --- authentication management functions --- */
359
360/* Attempt a conversation */
361
362static int converse(pam_handle_t *pamh, int nargs,
363 struct pam_message **message,
364 struct pam_response **response)
365{
366 int retval;
367 struct pam_conv *conv;
368
369 retval = _pam_get_item(pamh, PAM_CONV, &conv );
370 if (retval == PAM_SUCCESS) {
371 retval = conv->conv(nargs, (const struct pam_message **)message,
372 response, conv->appdata_ptr);
373 }
374
375 return retval; /* propagate error status */
376}
377
378
379static int _make_remark(pam_handle_t * pamh, int flags, int type, const char *text)
380{
381 int retval = PAM_SUCCESS;
382
383 struct pam_message *pmsg[1], msg[1];
384 struct pam_response *resp;
385
386 if (flags & WINBIND_SILENT) {
387 return PAM_SUCCESS;
388 }
389
390 pmsg[0] = &msg[0];
391 msg[0].msg = CONST_DISCARD(char *, text);
392 msg[0].msg_style = type;
393
394 resp = NULL;
395 retval = converse(pamh, 1, pmsg, &resp);
396
397 if (resp) {
398 _pam_drop_reply(resp, 1);
399 }
400 return retval;
401}
402
403static int _make_remark_v(pam_handle_t * pamh, int flags, int type, const char *format, va_list args)
404{
405 char *var;
406 int ret;
407
408 ret = vasprintf(&var, format, args);
409 if (ret < 0) {
410 _pam_log(pamh, 0, LOG_ERR, "memory allocation failure");
411 return ret;
412 }
413
414 ret = _make_remark(pamh, flags, type, var);
415 SAFE_FREE(var);
416 return ret;
417}
418
419static int _make_remark_format(pam_handle_t * pamh, int flags, int type, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
420static int _make_remark_format(pam_handle_t * pamh, int flags, int type, const char *format, ...)
421{
422 int ret;
423 va_list args;
424
425 va_start(args, format);
426 ret = _make_remark_v(pamh, flags, type, format, args);
427 va_end(args);
428 return ret;
429}
430
431static int pam_winbind_request(pam_handle_t * pamh, int ctrl,
432 enum winbindd_cmd req_type,
433 struct winbindd_request *request,
434 struct winbindd_response *response)
435{
436 /* Fill in request and send down pipe */
437 init_request(request, req_type);
438
439 if (write_sock(request, sizeof(*request), 0, 0) == -1) {
440 _pam_log(pamh, ctrl, LOG_ERR, "pam_winbind_request: write to socket failed!");
441 close_sock();
442 return PAM_SERVICE_ERR;
443 }
444
445 /* Wait for reply */
446 if (read_reply(response) == -1) {
447 _pam_log(pamh, ctrl, LOG_ERR, "pam_winbind_request: read from socket failed!");
448 close_sock();
449 return PAM_SERVICE_ERR;
450 }
451
452 /* We are done with the socket - close it and avoid mischeif */
453 close_sock();
454
455 /* Copy reply data from socket */
456 if (response->result == WINBINDD_OK) {
457 return PAM_SUCCESS;
458 }
459
460 /* no need to check for pam_error codes for getpwnam() */
461 switch (req_type) {
462
463 case WINBINDD_GETPWNAM:
464 case WINBINDD_LOOKUPNAME:
465 if (strlen(response->data.auth.nt_status_string) > 0) {
466 _pam_log(pamh, ctrl, LOG_ERR, "request failed, NT error was %s",
467 response->data.auth.nt_status_string);
468 } else {
469 _pam_log(pamh, ctrl, LOG_ERR, "request failed");
470 }
471 return PAM_USER_UNKNOWN;
472 default:
473 break;
474 }
475
476 if (response->data.auth.pam_error != PAM_SUCCESS) {
477 _pam_log(pamh, ctrl, LOG_ERR, "request failed: %s, PAM error was %s (%d), NT error was %s",
478 response->data.auth.error_string,
479 pam_strerror(pamh, response->data.auth.pam_error),
480 response->data.auth.pam_error,
481 response->data.auth.nt_status_string);
482 return response->data.auth.pam_error;
483 }
484
485 _pam_log(pamh, ctrl, LOG_ERR, "request failed, but PAM error 0!");
486
487 return PAM_SERVICE_ERR;
488}
489
490static int pam_winbind_request_log(pam_handle_t * pamh,
491 int ctrl,
492 enum winbindd_cmd req_type,
493 struct winbindd_request *request,
494 struct winbindd_response *response,
495 const char *user)
496{
497 int retval;
498
499 retval = pam_winbind_request(pamh, ctrl, req_type, request, response);
500
501 switch (retval) {
502 case PAM_AUTH_ERR:
503 /* incorrect password */
504 _pam_log(pamh, ctrl, LOG_WARNING, "user '%s' denied access (incorrect password or invalid membership)", user);
505 return retval;
506 case PAM_ACCT_EXPIRED:
507 /* account expired */
508 _pam_log(pamh, ctrl, LOG_WARNING, "user '%s' account expired", user);
509 return retval;
510 case PAM_AUTHTOK_EXPIRED:
511 /* password expired */
512 _pam_log(pamh, ctrl, LOG_WARNING, "user '%s' password expired", user);
513 return retval;
514 case PAM_NEW_AUTHTOK_REQD:
515 /* new password required */
516 _pam_log(pamh, ctrl, LOG_WARNING, "user '%s' new password required", user);
517 return retval;
518 case PAM_USER_UNKNOWN:
519 /* the user does not exist */
520 _pam_log_debug(pamh, ctrl, LOG_NOTICE, "user '%s' not found", user);
521 if (ctrl & WINBIND_UNKNOWN_OK_ARG) {
522 return PAM_IGNORE;
523 }
524 return retval;
525 case PAM_SUCCESS:
526 /* Otherwise, the authentication looked good */
527 switch (req_type) {
528 case WINBINDD_INFO:
529 break;
530 case WINBINDD_PAM_AUTH:
531 _pam_log(pamh, ctrl, LOG_NOTICE, "user '%s' granted access", user);
532 break;
533 case WINBINDD_PAM_CHAUTHTOK:
534 _pam_log(pamh, ctrl, LOG_NOTICE, "user '%s' password changed", user);
535 break;
536 default:
537 _pam_log(pamh, ctrl, LOG_NOTICE, "user '%s' OK", user);
538 break;
539 }
540
541 return retval;
542 default:
543 /* we don't know anything about this return value */
544 _pam_log(pamh, ctrl, LOG_ERR, "internal module error (retval = %d, user = '%s')",
545 retval, user);
546 return retval;
547 }
548}
549
550/**
551 * send a password expiry message if required
552 *
553 * @param pamh PAM handle
554 * @param ctrl PAM winbind options.
555 * @param next_change expected (calculated) next expiry date.
556 * @param already_expired pointer to a boolean to indicate if the password is
557 * already expired.
558 *
559 * @return boolean Returns True if message has been sent, False if not.
560 */
561
562static BOOL _pam_send_password_expiry_message(pam_handle_t *pamh, int ctrl, time_t next_change, time_t now, BOOL *already_expired)
563{
564 int days = 0;
565 struct tm tm_now, tm_next_change;
566
567 if (already_expired) {
568 *already_expired = False;
569 }
570
571 if (next_change <= now) {
572 PAM_WB_REMARK_DIRECT(pamh, ctrl, "NT_STATUS_PASSWORD_EXPIRED");
573 if (already_expired) {
574 *already_expired = True;
575 }
576 return True;
577 }
578
579 if ((next_change < 0) ||
580 (next_change > now + DAYS_TO_WARN_BEFORE_PWD_EXPIRES * SECONDS_PER_DAY)) {
581 return False;
582 }
583
584 if ((localtime_r(&now, &tm_now) == NULL) ||
585 (localtime_r(&next_change, &tm_next_change) == NULL)) {
586 return False;
587 }
588
589 days = (tm_next_change.tm_yday+tm_next_change.tm_year*365) - (tm_now.tm_yday+tm_now.tm_year*365);
590
591 if (days == 0) {
592 _make_remark(pamh, ctrl, PAM_TEXT_INFO, "Your password expires today");
593 return True;
594 }
595
596 if (days > 0 && days < DAYS_TO_WARN_BEFORE_PWD_EXPIRES) {
597 _make_remark_format(pamh, ctrl, PAM_TEXT_INFO, "Your password will expire in %d %s",
598 days, (days > 1) ? "days":"day");
599 return True;
600 }
601
602 return False;
603}
604
605/**
606 * Send a warning if the password expires in the near future
607 *
608 * @param pamh PAM handle
609 * @param ctrl PAM winbind options.
610 * @param response The full authentication response structure.
611 * @param already_expired boolean, is the pwd already expired?
612 *
613 * @return void.
614 */
615
616static void _pam_warn_password_expiry(pam_handle_t *pamh,
617 int flags,
618 const struct winbindd_response *response,
619 BOOL *already_expired)
620{
621 time_t now = time(NULL);
622 time_t next_change = 0;
623
624 if (already_expired) {
625 *already_expired = False;
626 }
627
628 /* accounts with ACB_PWNOEXP set never receive a warning */
629 if (response->data.auth.info3.acct_flags & ACB_PWNOEXP) {
630 return;
631 }
632
633 /* no point in sending a warning if this is a grace logon */
634 if (PAM_WB_GRACE_LOGON(response->data.auth.info3.user_flgs)) {
635 return;
636 }
637
638 /* check if the info3 must change timestamp has been set */
639 next_change = response->data.auth.info3.pass_must_change_time;
640
641 if (_pam_send_password_expiry_message(pamh, flags, next_change, now,
642 already_expired)) {
643 return;
644 }
645
646 /* now check for the global password policy */
647 /* good catch from Ralf Haferkamp: an expiry of "never" is translated
648 * to -1 */
649 if (response->data.auth.policy.expire <= 0) {
650 return;
651 }
652
653 next_change = response->data.auth.info3.pass_last_set_time +
654 response->data.auth.policy.expire;
655
656 if (_pam_send_password_expiry_message(pamh, flags, next_change, now,
657 already_expired)) {
658 return;
659 }
660
661 /* no warning sent */
662}
663
664#define IS_SID_STRING(name) (strncmp("S-", name, 2) == 0)
665
666static BOOL safe_append_string(char *dest,
667 const char *src,
668 int dest_buffer_size)
669/**
670 * Append a string, making sure not to overflow and to always return a NULL-terminated
671 * string.
672 *
673 * @param dest Destination string buffer (must already be NULL-terminated).
674 * @param src Source string buffer.
675 * @param dest_buffer_size Size of dest buffer in bytes.
676 *
677 * @return False if dest buffer is not big enough (no bytes copied), True on success.
678 */
679{
680 int dest_length = strlen(dest);
681 int src_length = strlen(src);
682
683 if ( dest_length + src_length + 1 > dest_buffer_size ) {
684 return False;
685 }
686
687 memcpy(dest + dest_length, src, src_length + 1);
688 return True;
689}
690
691static BOOL winbind_name_to_sid_string(pam_handle_t *pamh,
692 int ctrl,
693 const char *user,
694 const char *name,
695 char *sid_list_buffer,
696 int sid_list_buffer_size)
697/**
698 * Convert a names into a SID string, appending it to a buffer.
699 *
700 * @param pamh PAM handle
701 * @param ctrl PAM winbind options.
702 * @param user User in PAM request.
703 * @param name Name to convert.
704 * @param sid_list_buffer Where to append the string sid.
705 * @param sid_list_buffer Size of sid_list_buffer (in bytes).
706 *
707 * @return False on failure, True on success.
708 */
709{
710 const char* sid_string;
711 struct winbindd_response sid_response;
712
713 /* lookup name? */
714 if (IS_SID_STRING(name)) {
715 sid_string = name;
716 } else {
717 struct winbindd_request sid_request;
718
719 ZERO_STRUCT(sid_request);
720 ZERO_STRUCT(sid_response);
721
722 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "no sid given, looking up: %s\n", name);
723
724 /* fortunatly winbindd can handle non-separated names */
725 strncpy(sid_request.data.name.name, name,
726 sizeof(sid_request.data.name.name) - 1);
727
728 if (pam_winbind_request_log(pamh, ctrl, WINBINDD_LOOKUPNAME, &sid_request, &sid_response, user)) {
729 _pam_log(pamh, ctrl, LOG_INFO, "could not lookup name: %s\n", name);
730 return False;
731 }
732
733 sid_string = sid_response.data.sid.sid;
734 }
735
736 if (!safe_append_string(sid_list_buffer, sid_string, sid_list_buffer_size)) {
737 return False;
738 }
739
740 return True;
741}
742
743static BOOL winbind_name_list_to_sid_string_list(pam_handle_t *pamh,
744 int ctrl,
745 const char *user,
746 const char *name_list,
747 char *sid_list_buffer,
748 int sid_list_buffer_size)
749/**
750 * Convert a list of names into a list of sids.
751 *
752 * @param pamh PAM handle
753 * @param ctrl PAM winbind options.
754 * @param user User in PAM request.
755 * @param name_list List of names or string sids, separated by commas.
756 * @param sid_list_buffer Where to put the list of string sids.
757 * @param sid_list_buffer Size of sid_list_buffer (in bytes).
758 *
759 * @return False on failure, True on success.
760 */
761{
762 BOOL result = False;
763 char *current_name = NULL;
764 const char *search_location;
765 const char *comma;
766
767 if ( sid_list_buffer_size > 0 ) {
768 sid_list_buffer[0] = 0;
769 }
770
771 search_location = name_list;
772 while ( (comma = strstr(search_location, ",")) != NULL ) {
773 current_name = strndup(search_location, comma - search_location);
774 if (NULL == current_name) {
775 goto out;
776 }
777
778 if (!winbind_name_to_sid_string(pamh, ctrl, user, current_name, sid_list_buffer, sid_list_buffer_size)) {
779 goto out;
780 }
781
782 SAFE_FREE(current_name);
783
784 if (!safe_append_string(sid_list_buffer, ",", sid_list_buffer_size)) {
785 goto out;
786 }
787
788 search_location = comma + 1;
789 }
790
791 if (!winbind_name_to_sid_string(pamh, ctrl, user, search_location, sid_list_buffer, sid_list_buffer_size)) {
792 goto out;
793 }
794
795 result = True;
796
797out:
798 SAFE_FREE(current_name);
799 return result;
800}
801
802/**
803 * put krb5ccname variable into environment
804 *
805 * @param pamh PAM handle
806 * @param ctrl PAM winbind options.
807 * @param krb5ccname env variable retrieved from winbindd.
808 *
809 * @return void.
810 */
811
812static void _pam_setup_krb5_env(pam_handle_t *pamh, int ctrl, const char *krb5ccname)
813{
814 char var[PATH_MAX];
815 int ret;
816
817 if (off(ctrl, WINBIND_KRB5_AUTH)) {
818 return;
819 }
820
821 if (!krb5ccname || (strlen(krb5ccname) == 0)) {
822 return;
823 }
824
825 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "request returned KRB5CCNAME: %s", krb5ccname);
826
827 if (snprintf(var, sizeof(var), "KRB5CCNAME=%s", krb5ccname) == -1) {
828 return;
829 }
830
831 ret = pam_putenv(pamh, var);
832 if (ret) {
833 _pam_log(pamh, ctrl, LOG_ERR, "failed to set KRB5CCNAME to %s: %s",
834 var, pam_strerror(pamh, ret));
835 }
836}
837
838/**
839 * Set string into the PAM stack.
840 *
841 * @param pamh PAM handle
842 * @param ctrl PAM winbind options.
843 * @param data_name Key name for pam_set_data.
844 * @param value String value.
845 *
846 * @return void.
847 */
848
849static void _pam_set_data_string(pam_handle_t *pamh, int ctrl, const char *data_name, const char *value)
850{
851 int ret;
852
853 if ( !data_name || !value || (strlen(data_name) == 0) || (strlen(value) == 0) ) {
854 return;
855 }
856
857 ret = pam_set_data(pamh, data_name, (void *)strdup(value), _pam_winbind_cleanup_func);
858 if (ret) {
859 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "Could not set data %s: %s\n",
860 data_name, pam_strerror(pamh, ret));
861 }
862
863}
864
865/**
866 * Set info3 strings into the PAM stack.
867 *
868 * @param pamh PAM handle
869 * @param ctrl PAM winbind options.
870 * @param data_name Key name for pam_set_data.
871 * @param value String value.
872 *
873 * @return void.
874 */
875
876static void _pam_set_data_info3(pam_handle_t *pamh, int ctrl, struct winbindd_response *response)
877{
878 _pam_set_data_string(pamh, ctrl, PAM_WINBIND_HOMEDIR, response->data.auth.info3.home_dir);
879 _pam_set_data_string(pamh, ctrl, PAM_WINBIND_LOGONSCRIPT, response->data.auth.info3.logon_script);
880 _pam_set_data_string(pamh, ctrl, PAM_WINBIND_LOGONSERVER, response->data.auth.info3.logon_srv);
881 _pam_set_data_string(pamh, ctrl, PAM_WINBIND_PROFILEPATH, response->data.auth.info3.profile_path);
882}
883
884/**
885 * Free info3 strings in the PAM stack.
886 *
887 * @param pamh PAM handle
888 *
889 * @return void.
890 */
891
892static void _pam_free_data_info3(pam_handle_t *pamh)
893{
894 pam_set_data(pamh, PAM_WINBIND_HOMEDIR, NULL, NULL);
895 pam_set_data(pamh, PAM_WINBIND_LOGONSCRIPT, NULL, NULL);
896 pam_set_data(pamh, PAM_WINBIND_LOGONSERVER, NULL, NULL);
897 pam_set_data(pamh, PAM_WINBIND_PROFILEPATH, NULL, NULL);
898}
899
900/**
901 * Send PAM_ERROR_MSG for cached or grace logons.
902 *
903 * @param pamh PAM handle
904 * @param ctrl PAM winbind options.
905 * @param username User in PAM request.
906 * @param info3_user_flgs Info3 flags containing logon type bits.
907 *
908 * @return void.
909 */
910
911static void _pam_warn_logon_type(pam_handle_t *pamh, int ctrl, const char *username, uint32 info3_user_flgs)
912{
913 /* inform about logon type */
914 if (PAM_WB_GRACE_LOGON(info3_user_flgs)) {
915
916 _make_remark(pamh, ctrl, PAM_ERROR_MSG,
917 "Grace login. Please change your password as soon you're online again");
918 _pam_log_debug(pamh, ctrl, LOG_DEBUG,
919 "User %s logged on using grace logon\n", username);
920
921 } else if (PAM_WB_CACHED_LOGON(info3_user_flgs)) {
922
923 _make_remark(pamh, ctrl, PAM_ERROR_MSG,
924 "Domain Controller unreachable, using cached credentials instead. Network resources may be unavailable");
925 _pam_log_debug(pamh, ctrl, LOG_DEBUG,
926 "User %s logged on using cached credentials\n", username);
927 }
928}
929
930/**
931 * Compose Password Restriction String for a PAM_ERROR_MSG conversation.
932 *
933 * @param response The struct winbindd_response.
934 *
935 * @return string (caller needs to free).
936 */
937
938static char *_pam_compose_pwd_restriction_string(struct winbindd_response *response)
939{
940 char *str = NULL;
941 size_t offset = 0, ret = 0, str_size = 1024;
942
943 str = (char *)malloc(str_size);
944 if (!str) {
945 return NULL;
946 }
947
948 memset(str, '\0', str_size);
949
950 offset = snprintf(str, str_size, "Your password ");
951 if (offset == -1) {
952 goto failed;
953 }
954
955 if (response->data.auth.policy.min_length_password > 0) {
956 ret = snprintf(str+offset, str_size-offset,
957 "must be at least %d characters; ",
958 response->data.auth.policy.min_length_password);
959 if (ret == -1) {
960 goto failed;
961 }
962 offset += ret;
963 }
964
965 if (response->data.auth.policy.password_history > 0) {
966 ret = snprintf(str+offset, str_size-offset,
967 "cannot repeat any of your previous %d passwords; ",
968 response->data.auth.policy.password_history);
969 if (ret == -1) {
970 goto failed;
971 }
972 offset += ret;
973 }
974
975 if (response->data.auth.policy.password_properties & DOMAIN_PASSWORD_COMPLEX) {
976 ret = snprintf(str+offset, str_size-offset,
977 "must contain capitals, numerals or punctuation; "
978 "and cannot contain your account or full name; ");
979 if (ret == -1) {
980 goto failed;
981 }
982 offset += ret;
983 }
984
985 ret = snprintf(str+offset, str_size-offset,
986 "Please type a different password. "
987 "Type a password which meets these requirements in both text boxes.");
988 if (ret == -1) {
989 goto failed;
990 }
991
992 return str;
993
994 failed:
995 SAFE_FREE(str);
996 return NULL;
997}
998
999/* talk to winbindd */
1000static int winbind_auth_request(pam_handle_t * pamh,
1001 int ctrl,
1002 const char *user,
1003 const char *pass,
1004 const char *member,
1005 const char *cctype,
1006 struct winbindd_response *p_response,
1007 time_t *pwd_last_set,
1008 char **user_ret)
1009{
1010 struct winbindd_request request;
1011 struct winbindd_response response;
1012 int ret;
1013 BOOL already_expired = False;
1014
1015 ZERO_STRUCT(request);
1016 ZERO_STRUCT(response);
1017
1018 if (pwd_last_set) {
1019 *pwd_last_set = 0;
1020 }
1021
1022 strncpy(request.data.auth.user, user,
1023 sizeof(request.data.auth.user)-1);
1024
1025 strncpy(request.data.auth.pass, pass,
1026 sizeof(request.data.auth.pass)-1);
1027
1028 request.data.auth.krb5_cc_type[0] = '\0';
1029 request.data.auth.uid = -1;
1030
1031 request.flags = WBFLAG_PAM_INFO3_TEXT | WBFLAG_PAM_CONTACT_TRUSTDOM;
1032
1033 if (ctrl & (WINBIND_KRB5_AUTH|WINBIND_CACHED_LOGIN)) {
1034 struct passwd *pwd = NULL;
1035
1036 pwd = getpwnam(user);
1037 if (pwd == NULL) {
1038 return PAM_USER_UNKNOWN;
1039 }
1040 request.data.auth.uid = pwd->pw_uid;
1041 }
1042
1043 if (ctrl & WINBIND_KRB5_AUTH) {
1044
1045 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "enabling krb5 login flag\n");
1046
1047 request.flags |= WBFLAG_PAM_KRB5 | WBFLAG_PAM_FALLBACK_AFTER_KRB5;
1048 }
1049
1050 if (ctrl & WINBIND_CACHED_LOGIN) {
1051 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "enabling cached login flag\n");
1052 request.flags |= WBFLAG_PAM_CACHED_LOGIN;
1053 }
1054
1055 if (user_ret) {
1056 *user_ret = NULL;
1057 request.flags |= WBFLAG_PAM_UNIX_NAME;
1058 }
1059
1060 if (cctype != NULL) {
1061 strncpy(request.data.auth.krb5_cc_type, cctype,
1062 sizeof(request.data.auth.krb5_cc_type) - 1);
1063 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "enabling request for a %s krb5 ccache\n", cctype);
1064 }
1065
1066 request.data.auth.require_membership_of_sid[0] = '\0';
1067
1068 if (member != NULL) {
1069
1070 if (!winbind_name_list_to_sid_string_list(pamh, ctrl, user, member,
1071 request.data.auth.require_membership_of_sid,
1072 sizeof(request.data.auth.require_membership_of_sid))) {
1073
1074 _pam_log_debug(pamh, ctrl, LOG_ERR, "failed to serialize membership of sid \"%s\"\n", member);
1075 return PAM_AUTH_ERR;
1076 }
1077 }
1078
1079 ret = pam_winbind_request_log(pamh, ctrl, WINBINDD_PAM_AUTH, &request, &response, user);
1080
1081 if (pwd_last_set) {
1082 *pwd_last_set = response.data.auth.info3.pass_last_set_time;
1083 }
1084
1085 if (p_response) {
1086 /* We want to process the response in the caller. */
1087 *p_response = response;
1088 return ret;
1089 }
1090
1091 if (ret) {
1092 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_PASSWORD_EXPIRED");
1093 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_PASSWORD_MUST_CHANGE");
1094 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_INVALID_WORKSTATION");
1095 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_INVALID_LOGON_HOURS");
1096 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_ACCOUNT_EXPIRED");
1097 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_ACCOUNT_DISABLED");
1098 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_ACCOUNT_LOCKED_OUT");
1099 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT");
1100 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT");
1101 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT");
1102 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND");
1103 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_NO_LOGON_SERVERS");
1104 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_WRONG_PASSWORD");
1105 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_ACCESS_DENIED");
1106 }
1107
1108 if (ret == PAM_SUCCESS) {
1109
1110 /* warn a user if the password is about to expire soon */
1111 _pam_warn_password_expiry(pamh, ctrl, &response, &already_expired);
1112
1113 if (already_expired == True) {
1114 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "Password has expired "
1115 "(Password was last set: %lld, the policy says "
1116 "it should expire here %lld (now it's: %lu))\n",
1117 response.data.auth.info3.pass_last_set_time,
1118 response.data.auth.info3.pass_last_set_time +
1119 response.data.auth.policy.expire,
1120 time(NULL));
1121
1122 return PAM_AUTHTOK_EXPIRED;
1123 }
1124
1125 /* inform about logon type */
1126 _pam_warn_logon_type(pamh, ctrl, user, response.data.auth.info3.user_flgs);
1127
1128 /* set some info3 info for other modules in the stack */
1129 _pam_set_data_info3(pamh, ctrl, &response);
1130
1131 /* put krb5ccname into env */
1132 _pam_setup_krb5_env(pamh, ctrl, response.data.auth.krb5ccname);
1133
1134 /* If winbindd returned a username, return the pointer to it here. */
1135 if (user_ret && response.extra_data.data) {
1136 /* We have to trust it's a null terminated string. */
1137 *user_ret = (char *)response.extra_data.data;
1138 }
1139 }
1140
1141 return ret;
1142}
1143
1144/* talk to winbindd */
1145static int winbind_chauthtok_request(pam_handle_t * pamh,
1146 int ctrl,
1147 const char *user,
1148 const char *oldpass,
1149 const char *newpass,
1150 time_t pwd_last_set)
1151{
1152 struct winbindd_request request;
1153 struct winbindd_response response;
1154 int ret;
1155
1156 ZERO_STRUCT(request);
1157 ZERO_STRUCT(response);
1158
1159 if (request.data.chauthtok.user == NULL) return -2;
1160
1161 strncpy(request.data.chauthtok.user, user,
1162 sizeof(request.data.chauthtok.user) - 1);
1163
1164 if (oldpass != NULL) {
1165 strncpy(request.data.chauthtok.oldpass, oldpass,
1166 sizeof(request.data.chauthtok.oldpass) - 1);
1167 } else {
1168 request.data.chauthtok.oldpass[0] = '\0';
1169 }
1170
1171 if (newpass != NULL) {
1172 strncpy(request.data.chauthtok.newpass, newpass,
1173 sizeof(request.data.chauthtok.newpass) - 1);
1174 } else {
1175 request.data.chauthtok.newpass[0] = '\0';
1176 }
1177
1178 if (ctrl & WINBIND_KRB5_AUTH) {
1179 request.flags = WBFLAG_PAM_KRB5 | WBFLAG_PAM_CONTACT_TRUSTDOM;
1180 }
1181
1182 ret = pam_winbind_request_log(pamh, ctrl, WINBINDD_PAM_CHAUTHTOK, &request, &response, user);
1183
1184 if (ret == PAM_SUCCESS) {
1185 return ret;
1186 }
1187
1188 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_BACKUP_CONTROLLER");
1189 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND");
1190 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_NO_LOGON_SERVERS");
1191 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_ACCESS_DENIED");
1192
1193 /* TODO: tell the min pwd length ? */
1194 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_PWD_TOO_SHORT");
1195
1196 /* TODO: tell the minage ? */
1197 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_PWD_TOO_RECENT");
1198
1199 /* TODO: tell the history length ? */
1200 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_PWD_HISTORY_CONFLICT");
1201
1202 if (!strcasecmp(response.data.auth.nt_status_string, "NT_STATUS_PASSWORD_RESTRICTION")) {
1203
1204 char *pwd_restriction_string = NULL;
1205
1206 /* FIXME: avoid to send multiple PAM messages after another */
1207 switch (response.data.auth.reject_reason) {
1208 case -1:
1209 break;
1210 case REJECT_REASON_OTHER:
1211 if ((response.data.auth.policy.min_passwordage > 0) &&
1212 (pwd_last_set + response.data.auth.policy.min_passwordage > time(NULL))) {
1213 PAM_WB_REMARK_DIRECT(pamh, ctrl, "NT_STATUS_PWD_TOO_RECENT");
1214 }
1215 break;
1216 case REJECT_REASON_TOO_SHORT:
1217 PAM_WB_REMARK_DIRECT(pamh, ctrl, "NT_STATUS_PWD_TOO_SHORT");
1218 break;
1219 case REJECT_REASON_IN_HISTORY:
1220 PAM_WB_REMARK_DIRECT(pamh, ctrl, "NT_STATUS_PWD_HISTORY_CONFLICT");
1221 break;
1222 case REJECT_REASON_NOT_COMPLEX:
1223 _make_remark(pamh, ctrl, PAM_ERROR_MSG, "Password does not meet complexity requirements");
1224 break;
1225 default:
1226 _pam_log_debug(pamh, ctrl, LOG_DEBUG,
1227 "unknown password change reject reason: %d",
1228 response.data.auth.reject_reason);
1229 break;
1230 }
1231
1232 pwd_restriction_string = _pam_compose_pwd_restriction_string(&response);
1233 if (pwd_restriction_string) {
1234 _make_remark(pamh, ctrl, PAM_ERROR_MSG, pwd_restriction_string);
1235 SAFE_FREE(pwd_restriction_string);
1236 }
1237 }
1238
1239 return ret;
1240}
1241
1242/*
1243 * Checks if a user has an account
1244 *
1245 * return values:
1246 * 1 = User not found
1247 * 0 = OK
1248 * -1 = System error
1249 */
1250static int valid_user(pam_handle_t *pamh, int ctrl, const char *user)
1251{
1252 /* check not only if the user is available over NSS calls, also make
1253 * sure it's really a winbind user, this is important when stacking PAM
1254 * modules in the 'account' or 'password' facility. */
1255
1256 struct passwd *pwd = NULL;
1257 struct winbindd_request request;
1258 struct winbindd_response response;
1259 int ret;
1260
1261 ZERO_STRUCT(request);
1262 ZERO_STRUCT(response);
1263
1264 pwd = getpwnam(user);
1265 if (pwd == NULL) {
1266 return 1;
1267 }
1268
1269 strncpy(request.data.username, user,
1270 sizeof(request.data.username) - 1);
1271
1272 ret = pam_winbind_request_log(pamh, ctrl, WINBINDD_GETPWNAM, &request, &response, user);
1273
1274 switch (ret) {
1275 case PAM_USER_UNKNOWN:
1276 return 1;
1277 case PAM_SUCCESS:
1278 return 0;
1279 default:
1280 break;
1281 }
1282 return -1;
1283}
1284
1285static char *_pam_delete(register char *xx)
1286{
1287 _pam_overwrite(xx);
1288 _pam_drop(xx);
1289 return NULL;
1290}
1291
1292/*
1293 * obtain a password from the user
1294 */
1295
1296static int _winbind_read_password(pam_handle_t * pamh,
1297 unsigned int ctrl,
1298 const char *comment,
1299 const char *prompt1,
1300 const char *prompt2,
1301 const char **pass)
1302{
1303 int authtok_flag;
1304 int retval;
1305 const char *item;
1306 char *token;
1307
1308 _pam_log(pamh, ctrl, LOG_DEBUG, "getting password (0x%08x)", ctrl);
1309
1310 /*
1311 * make sure nothing inappropriate gets returned
1312 */
1313
1314 *pass = token = NULL;
1315
1316 /*
1317 * which authentication token are we getting?
1318 */
1319
1320 authtok_flag = on(WINBIND__OLD_PASSWORD, ctrl) ? PAM_OLDAUTHTOK : PAM_AUTHTOK;
1321
1322 /*
1323 * should we obtain the password from a PAM item ?
1324 */
1325
1326 if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) || on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
1327 retval = _pam_get_item(pamh, authtok_flag, &item);
1328 if (retval != PAM_SUCCESS) {
1329 /* very strange. */
1330 _pam_log(pamh, ctrl, LOG_ALERT,
1331 "pam_get_item returned error to unix-read-password"
1332 );
1333 return retval;
1334 } else if (item != NULL) { /* we have a password! */
1335 *pass = item;
1336 item = NULL;
1337 _pam_log(pamh, ctrl, LOG_DEBUG,
1338 "pam_get_item returned a password");
1339 return PAM_SUCCESS;
1340 } else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
1341 return PAM_AUTHTOK_RECOVER_ERR; /* didn't work */
1342 } else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl)
1343 && off(WINBIND__OLD_PASSWORD, ctrl)) {
1344 return PAM_AUTHTOK_RECOVER_ERR;
1345 }
1346 }
1347 /*
1348 * getting here implies we will have to get the password from the
1349 * user directly.
1350 */
1351
1352 {
1353 struct pam_message msg[3], *pmsg[3];
1354 struct pam_response *resp;
1355 int i, replies;
1356
1357 /* prepare to converse */
1358
1359 if (comment != NULL && off(ctrl, WINBIND_SILENT)) {
1360 pmsg[0] = &msg[0];
1361 msg[0].msg_style = PAM_TEXT_INFO;
1362 msg[0].msg = CONST_DISCARD(char *, comment);
1363 i = 1;
1364 } else {
1365 i = 0;
1366 }
1367
1368 pmsg[i] = &msg[i];
1369 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
1370 msg[i++].msg = CONST_DISCARD(char *, prompt1);
1371 replies = 1;
1372
1373 if (prompt2 != NULL) {
1374 pmsg[i] = &msg[i];
1375 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
1376 msg[i++].msg = CONST_DISCARD(char *, prompt2);
1377 ++replies;
1378 }
1379 /* so call the conversation expecting i responses */
1380 resp = NULL;
1381 retval = converse(pamh, i, pmsg, &resp);
1382
1383 if (resp != NULL) {
1384
1385 /* interpret the response */
1386
1387 if (retval == PAM_SUCCESS) { /* a good conversation */
1388
1389 token = x_strdup(resp[i - replies].resp);
1390 if (token != NULL) {
1391 if (replies == 2) {
1392 /* verify that password entered correctly */
1393 if (!resp[i - 1].resp
1394 || strcmp(token, resp[i - 1].resp)) {
1395 _pam_delete(token); /* mistyped */
1396 retval = PAM_AUTHTOK_RECOVER_ERR;
1397 _make_remark(pamh, ctrl, PAM_ERROR_MSG, MISTYPED_PASS);
1398 }
1399 }
1400 } else {
1401 _pam_log(pamh, ctrl, LOG_NOTICE, "could not recover authentication token");
1402 retval = PAM_AUTHTOK_RECOVER_ERR;
1403 }
1404
1405 }
1406 /*
1407 * tidy up the conversation (resp_retcode) is ignored
1408 * -- what is it for anyway? AGM
1409 */
1410
1411 _pam_drop_reply(resp, i);
1412
1413 } else {
1414 retval = (retval == PAM_SUCCESS)
1415 ? PAM_AUTHTOK_RECOVER_ERR : retval;
1416 }
1417 }
1418
1419 if (retval != PAM_SUCCESS) {
1420 _pam_log_debug(pamh, ctrl, LOG_DEBUG,
1421 "unable to obtain a password");
1422 return retval;
1423 }
1424 /* 'token' is the entered password */
1425
1426 /* we store this password as an item */
1427
1428 retval = pam_set_item(pamh, authtok_flag, token);
1429 _pam_delete(token); /* clean it up */
1430 if (retval != PAM_SUCCESS ||
1431 (retval = _pam_get_item(pamh, authtok_flag, &item)) != PAM_SUCCESS) {
1432
1433 _pam_log(pamh, ctrl, LOG_CRIT, "error manipulating password");
1434 return retval;
1435
1436 }
1437
1438 *pass = item;
1439 item = NULL; /* break link to password */
1440
1441 return PAM_SUCCESS;
1442}
1443
1444const char *get_conf_item_string(const pam_handle_t *pamh,
1445 int argc,
1446 const char **argv,
1447 int ctrl,
1448 dictionary *d,
1449 const char *item,
1450 int config_flag)
1451{
1452 int i = 0;
1453 const char *parm_opt = NULL;
1454 char *key = NULL;
1455
1456 if (!(ctrl & config_flag)) {
1457 goto out;
1458 }
1459
1460 /* let the pam opt take precedence over the pam_winbind.conf option */
1461
1462 if (d != NULL) {
1463
1464 if (!asprintf(&key, "global:%s", item)) {
1465 goto out;
1466 }
1467
1468 parm_opt = iniparser_getstr(d, key);
1469 SAFE_FREE(key);
1470 }
1471
1472 for ( i=0; i<argc; i++ ) {
1473
1474 if ((strncmp(argv[i], item, strlen(item)) == 0)) {
1475 char *p;
1476
1477 if ( (p = strchr( argv[i], '=' )) == NULL) {
1478 _pam_log(pamh, ctrl, LOG_INFO, "no \"=\" delimiter for \"%s\" found\n", item);
1479 goto out;
1480 }
1481 _pam_log_debug(pamh, ctrl, LOG_INFO, "PAM config: %s '%s'\n", item, p+1);
1482 return p + 1;
1483 }
1484 }
1485
1486 if (d != NULL) {
1487 _pam_log_debug(pamh, ctrl, LOG_INFO, "CONFIG file: %s '%s'\n", item, parm_opt);
1488 }
1489out:
1490 return parm_opt;
1491}
1492
1493const char *get_krb5_cc_type_from_config(const pam_handle_t *pamh, int argc, const char **argv, int ctrl, dictionary *d)
1494{
1495 return get_conf_item_string(pamh, argc, argv, ctrl, d, "krb5_ccache_type", WINBIND_KRB5_CCACHE_TYPE);
1496}
1497
1498const char *get_member_from_config(const pam_handle_t *pamh, int argc, const char **argv, int ctrl, dictionary *d)
1499{
1500 const char *ret = NULL;
1501 ret = get_conf_item_string(pamh, argc, argv, ctrl, d, "require_membership_of", WINBIND_REQUIRED_MEMBERSHIP);
1502 if (ret) {
1503 return ret;
1504 }
1505 return get_conf_item_string(pamh, argc, argv, ctrl, d, "require-membership-of", WINBIND_REQUIRED_MEMBERSHIP);
1506}
1507
1508PAM_EXTERN
1509int pam_sm_authenticate(pam_handle_t *pamh, int flags,
1510 int argc, const char **argv)
1511{
1512 const char *username;
1513 const char *password;
1514 const char *member = NULL;
1515 const char *cctype = NULL;
1516 int retval = PAM_AUTH_ERR;
1517 dictionary *d = NULL;
1518 char *username_ret = NULL;
1519 char *new_authtok_required = NULL;
1520 char *real_username = NULL;
1521
1522 /* parse arguments */
1523 int ctrl = _pam_parse(pamh, flags, argc, argv, &d);
1524 if (ctrl == -1) {
1525 retval = PAM_SYSTEM_ERR;
1526 goto out;
1527 }
1528
1529 _PAM_LOG_FUNCTION_ENTER("pam_sm_authenticate", pamh, ctrl, flags);
1530
1531 /* Get the username */
1532 retval = pam_get_user(pamh, &username, NULL);
1533 if ((retval != PAM_SUCCESS) || (!username)) {
1534 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "can not get the username");
1535 retval = PAM_SERVICE_ERR;
1536 goto out;
1537 }
1538
1539#if defined(AIX)
1540 /* Decode the user name since AIX does not support logn user
1541 names by default. The name is encoded as _#uid. */
1542
1543 if ( username[0] == '_' ) {
1544 uid_t id = atoi( &username[1] );
1545 struct passwd *pw = NULL;
1546
1547 if ( (id!=0) && ((pw = getpwuid( id )) != NULL) ) {
1548 real_username = strdup( pw->pw_name );
1549 }
1550 }
1551#endif
1552
1553 if ( !real_username ) {
1554 /* Just making a copy of the username we got from PAM */
1555 if ( (real_username = strdup( username )) == NULL ) {
1556 _pam_log_debug(pamh, ctrl, LOG_DEBUG,
1557 "memory allocation failure when copying username");
1558 retval = PAM_SERVICE_ERR;
1559 goto out;
1560 }
1561 }
1562
1563 retval = _winbind_read_password(pamh, ctrl, NULL,
1564 "Password: ", NULL,
1565 &password);
1566
1567 if (retval != PAM_SUCCESS) {
1568 _pam_log(pamh, ctrl, LOG_ERR, "Could not retrieve user's password");
1569 retval = PAM_AUTHTOK_ERR;
1570 goto out;
1571 }
1572
1573 /* Let's not give too much away in the log file */
1574
1575#ifdef DEBUG_PASSWORD
1576 _pam_log_debug(pamh, ctrl, LOG_INFO, "Verify user '%s' with password '%s'",
1577 real_username, password);
1578#else
1579 _pam_log_debug(pamh, ctrl, LOG_INFO, "Verify user '%s'", real_username);
1580#endif
1581
1582 member = get_member_from_config(pamh, argc, argv, ctrl, d);
1583
1584 cctype = get_krb5_cc_type_from_config(pamh, argc, argv, ctrl, d);
1585
1586 /* Now use the username to look up password */
1587 retval = winbind_auth_request(pamh, ctrl, username, password, member,
1588 cctype, NULL, NULL, &username_ret);
1589
1590 if (retval == PAM_NEW_AUTHTOK_REQD ||
1591 retval == PAM_AUTHTOK_EXPIRED) {
1592
1593 char *new_authtok_required_during_auth = NULL;
1594
1595 if (!asprintf(&new_authtok_required, "%d", retval)) {
1596 retval = PAM_BUF_ERR;
1597 goto out;
1598 }
1599
1600 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, new_authtok_required, _pam_winbind_cleanup_func);
1601
1602 retval = PAM_SUCCESS;
1603
1604 if (!asprintf(&new_authtok_required_during_auth, "%d", True)) {
1605 retval = PAM_BUF_ERR;
1606 goto out;
1607 }
1608
1609 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
1610 new_authtok_required_during_auth, _pam_winbind_cleanup_func);
1611
1612 goto out;
1613 }
1614
1615out:
1616 if (username_ret) {
1617 pam_set_item (pamh, PAM_USER, username_ret);
1618 _pam_log_debug(pamh, ctrl, LOG_INFO, "Returned user was '%s'", username_ret);
1619 free(username_ret);
1620 }
1621
1622 if ( real_username ) {
1623 free( real_username );
1624 }
1625
1626 if (d) {
1627 iniparser_freedict(d);
1628 }
1629
1630 if (!new_authtok_required) {
1631 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, NULL, NULL);
1632 }
1633
1634 if (retval != PAM_SUCCESS) {
1635 _pam_free_data_info3(pamh);
1636 }
1637
1638 _PAM_LOG_FUNCTION_LEAVE("pam_sm_authenticate", pamh, ctrl, retval);
1639
1640 return retval;
1641}
1642
1643PAM_EXTERN
1644int pam_sm_setcred(pam_handle_t *pamh, int flags,
1645 int argc, const char **argv)
1646{
1647 int ret = PAM_SYSTEM_ERR;
1648 dictionary *d = NULL;
1649
1650 /* parse arguments */
1651 int ctrl = _pam_parse(pamh, flags, argc, argv, &d);
1652 if (ctrl == -1) {
1653 ret = PAM_SYSTEM_ERR;
1654 goto out;
1655 }
1656
1657 _PAM_LOG_FUNCTION_ENTER("pam_sm_setcred", pamh, ctrl, flags);
1658
1659 switch (flags & ~PAM_SILENT) {
1660
1661 case PAM_DELETE_CRED:
1662 ret = pam_sm_close_session(pamh, flags, argc, argv);
1663 break;
1664 case PAM_REFRESH_CRED:
1665 _pam_log_debug(pamh, ctrl, LOG_WARNING, "PAM_REFRESH_CRED not implemented");
1666 ret = PAM_SUCCESS;
1667 break;
1668 case PAM_REINITIALIZE_CRED:
1669 _pam_log_debug(pamh, ctrl, LOG_WARNING, "PAM_REINITIALIZE_CRED not implemented");
1670 ret = PAM_SUCCESS;
1671 break;
1672 case PAM_ESTABLISH_CRED:
1673 _pam_log_debug(pamh, ctrl, LOG_WARNING, "PAM_ESTABLISH_CRED not implemented");
1674 ret = PAM_SUCCESS;
1675 break;
1676 default:
1677 ret = PAM_SYSTEM_ERR;
1678 break;
1679 }
1680
1681 out:
1682 if (d) {
1683 iniparser_freedict(d);
1684 }
1685
1686 _PAM_LOG_FUNCTION_LEAVE("pam_sm_setcred", pamh, ctrl, ret);
1687
1688 return ret;
1689}
1690
1691/*
1692 * Account management. We want to verify that the account exists
1693 * before returning PAM_SUCCESS
1694 */
1695PAM_EXTERN
1696int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
1697 int argc, const char **argv)
1698{
1699 const char *username;
1700 int ret = PAM_USER_UNKNOWN;
1701 void *tmp = NULL;
1702 dictionary *d = NULL;
1703
1704 /* parse arguments */
1705 int ctrl = _pam_parse(pamh, flags, argc, argv, &d);
1706 if (ctrl == -1) {
1707 return PAM_SYSTEM_ERR;
1708 }
1709
1710 _PAM_LOG_FUNCTION_ENTER("pam_sm_acct_mgmt", pamh, ctrl, flags);
1711
1712
1713 /* Get the username */
1714 ret = pam_get_user(pamh, &username, NULL);
1715 if ((ret != PAM_SUCCESS) || (!username)) {
1716 _pam_log_debug(pamh, ctrl, LOG_DEBUG,"can not get the username");
1717 ret = PAM_SERVICE_ERR;
1718 goto out;
1719 }
1720
1721 /* Verify the username */
1722 ret = valid_user(pamh, ctrl, username);
1723 switch (ret) {
1724 case -1:
1725 /* some sort of system error. The log was already printed */
1726 ret = PAM_SERVICE_ERR;
1727 goto out;
1728 case 1:
1729 /* the user does not exist */
1730 _pam_log_debug(pamh, ctrl, LOG_NOTICE, "user '%s' not found", username);
1731 if (ctrl & WINBIND_UNKNOWN_OK_ARG) {
1732 ret = PAM_IGNORE;
1733 goto out;
1734 }
1735 ret = PAM_USER_UNKNOWN;
1736 goto out;
1737 case 0:
1738 pam_get_data( pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, (const void **)&tmp);
1739 if (tmp != NULL) {
1740 ret = atoi((const char *)tmp);
1741 switch (ret) {
1742 case PAM_AUTHTOK_EXPIRED:
1743 /* fall through, since new token is required in this case */
1744 case PAM_NEW_AUTHTOK_REQD:
1745 _pam_log(pamh, ctrl, LOG_WARNING, "pam_sm_acct_mgmt success but %s is set",
1746 PAM_WINBIND_NEW_AUTHTOK_REQD);
1747 _pam_log(pamh, ctrl, LOG_NOTICE, "user '%s' needs new password", username);
1748 /* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */
1749 ret = PAM_NEW_AUTHTOK_REQD;
1750 goto out;
1751 default:
1752 _pam_log(pamh, ctrl, LOG_WARNING, "pam_sm_acct_mgmt success");
1753 _pam_log(pamh, ctrl, LOG_NOTICE, "user '%s' granted access", username);
1754 ret = PAM_SUCCESS;
1755 goto out;
1756 }
1757 }
1758
1759 /* Otherwise, the authentication looked good */
1760 _pam_log(pamh, ctrl, LOG_NOTICE, "user '%s' granted access", username);
1761 ret = PAM_SUCCESS;
1762 goto out;
1763 default:
1764 /* we don't know anything about this return value */
1765 _pam_log(pamh, ctrl, LOG_ERR, "internal module error (ret = %d, user = '%s')",
1766 ret, username);
1767 ret = PAM_SERVICE_ERR;
1768 goto out;
1769 }
1770
1771 /* should not be reached */
1772 ret = PAM_IGNORE;
1773
1774 out:
1775
1776 if (d) {
1777 iniparser_freedict(d);
1778 }
1779
1780 _PAM_LOG_FUNCTION_LEAVE("pam_sm_acct_mgmt", pamh, ctrl, ret);
1781
1782 return ret;
1783}
1784
1785PAM_EXTERN
1786int pam_sm_open_session(pam_handle_t *pamh, int flags,
1787 int argc, const char **argv)
1788{
1789 int ret = PAM_SYSTEM_ERR;
1790 dictionary *d = NULL;
1791
1792 /* parse arguments */
1793 int ctrl = _pam_parse(pamh, flags, argc, argv, &d);
1794 if (ctrl == -1) {
1795 ret = PAM_SYSTEM_ERR;
1796 goto out;
1797 }
1798
1799 _PAM_LOG_FUNCTION_ENTER("pam_sm_open_session", pamh, ctrl, flags);
1800
1801 ret = PAM_SUCCESS;
1802
1803 out:
1804 if (d) {
1805 iniparser_freedict(d);
1806 }
1807
1808 _PAM_LOG_FUNCTION_LEAVE("pam_sm_open_session", pamh, ctrl, ret);
1809
1810 return ret;
1811}
1812
1813PAM_EXTERN
1814int pam_sm_close_session(pam_handle_t *pamh, int flags,
1815 int argc, const char **argv)
1816{
1817 dictionary *d = NULL;
1818 int retval = PAM_SUCCESS;
1819
1820 /* parse arguments */
1821 int ctrl = _pam_parse(pamh, flags, argc, argv, &d);
1822 if (ctrl == -1) {
1823 retval = PAM_SYSTEM_ERR;
1824 goto out;
1825 }
1826
1827 _PAM_LOG_FUNCTION_ENTER("pam_sm_close_session", pamh, ctrl, flags);
1828
1829 if (!(flags & PAM_DELETE_CRED)) {
1830 retval = PAM_SUCCESS;
1831 goto out;
1832 }
1833
1834 if (ctrl & WINBIND_KRB5_AUTH) {
1835
1836 /* destroy the ccache here */
1837 struct winbindd_request request;
1838 struct winbindd_response response;
1839 const char *user;
1840 const char *ccname = NULL;
1841 struct passwd *pwd = NULL;
1842
1843 ZERO_STRUCT(request);
1844 ZERO_STRUCT(response);
1845
1846 retval = pam_get_user(pamh, &user, "Username: ");
1847 if (retval) {
1848 _pam_log(pamh, ctrl, LOG_ERR, "could not identify user");
1849 goto out;
1850 }
1851
1852 if (user == NULL) {
1853 _pam_log(pamh, ctrl, LOG_ERR, "username was NULL!");
1854 retval = PAM_USER_UNKNOWN;
1855 goto out;
1856 }
1857
1858 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "username [%s] obtained", user);
1859
1860 ccname = pam_getenv(pamh, "KRB5CCNAME");
1861 if (ccname == NULL) {
1862 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "user has no KRB5CCNAME environment");
1863 }
1864
1865 strncpy(request.data.logoff.user, user,
1866 sizeof(request.data.logoff.user) - 1);
1867
1868 if (ccname) {
1869 strncpy(request.data.logoff.krb5ccname, ccname,
1870 sizeof(request.data.logoff.krb5ccname) - 1);
1871 }
1872
1873 pwd = getpwnam(user);
1874 if (pwd == NULL) {
1875 retval = PAM_USER_UNKNOWN;
1876 goto out;
1877 }
1878 request.data.logoff.uid = pwd->pw_uid;
1879
1880 request.flags = WBFLAG_PAM_KRB5 | WBFLAG_PAM_CONTACT_TRUSTDOM;
1881
1882 retval = pam_winbind_request_log(pamh, ctrl, WINBINDD_PAM_LOGOFF, &request, &response, user);
1883 }
1884
1885out:
1886 if (d) {
1887 iniparser_freedict(d);
1888 }
1889
1890 _PAM_LOG_FUNCTION_LEAVE("pam_sm_close_session", pamh, ctrl, retval);
1891
1892 return retval;
1893}
1894
1895/**
1896 * evaluate whether we need to re-authenticate with kerberos after a password change
1897 *
1898 * @param pamh PAM handle
1899 * @param ctrl PAM winbind options.
1900 * @param user The username
1901 *
1902 * @return boolean Returns True if required, False if not.
1903 */
1904
1905static BOOL _pam_require_krb5_auth_after_chauthtok(pam_handle_t *pamh, int ctrl, const char *user)
1906{
1907
1908 /* Make sure that we only do this if
1909 * a) the chauthtok got initiated during a logon attempt (authenticate->acct_mgmt->chauthtok)
1910 * b) any later password change via the "passwd" command if done by the user itself
1911 */
1912
1913 char *new_authtok_reqd_during_auth = NULL;
1914 struct passwd *pwd = NULL;
1915
1916 if (!(ctrl & WINBIND_KRB5_AUTH)) {
1917 return False;
1918 }
1919
1920 _pam_get_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH, &new_authtok_reqd_during_auth);
1921 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH, NULL, NULL);
1922
1923 if (new_authtok_reqd_during_auth) {
1924 return True;
1925 }
1926
1927 pwd = getpwnam(user);
1928 if (!pwd) {
1929 return False;
1930 }
1931
1932 if (getuid() == pwd->pw_uid) {
1933 return True;
1934 }
1935
1936 return False;
1937}
1938
1939
1940PAM_EXTERN
1941int pam_sm_chauthtok(pam_handle_t * pamh, int flags,
1942 int argc, const char **argv)
1943{
1944 unsigned int lctrl;
1945 int ret;
1946 unsigned int ctrl;
1947
1948 /* <DO NOT free() THESE> */
1949 const char *user;
1950 char *pass_old, *pass_new;
1951 /* </DO NOT free() THESE> */
1952
1953 char *Announce;
1954
1955 int retry = 0;
1956 dictionary *d = NULL;
1957 char *username_ret = NULL;
1958 struct winbindd_response response;
1959
1960 ZERO_STRUCT(response);
1961
1962 ctrl = _pam_parse(pamh, flags, argc, argv, &d);
1963 if (ctrl == -1) {
1964 ret = PAM_SYSTEM_ERR;
1965 goto out;
1966 }
1967
1968 _PAM_LOG_FUNCTION_ENTER("pam_sm_chauthtok", pamh, ctrl, flags);
1969
1970 /* clearing offline bit for the auth in the password change */
1971 ctrl &= ~WINBIND_CACHED_LOGIN;
1972
1973 /*
1974 * First get the name of a user
1975 */
1976 ret = pam_get_user(pamh, &user, "Username: ");
1977 if (ret) {
1978 _pam_log(pamh, ctrl, LOG_ERR,
1979 "password - could not identify user");
1980 goto out;
1981 }
1982
1983 if (user == NULL) {
1984 _pam_log(pamh, ctrl, LOG_ERR, "username was NULL!");
1985 ret = PAM_USER_UNKNOWN;
1986 goto out;
1987 }
1988
1989 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "username [%s] obtained", user);
1990
1991 /* check if this is really a user in winbindd, not only in NSS */
1992 ret = valid_user(pamh, ctrl, user);
1993 switch (ret) {
1994 case 1:
1995 ret = PAM_USER_UNKNOWN;
1996 goto out;
1997 case -1:
1998 ret = PAM_SYSTEM_ERR;
1999 goto out;
2000 default:
2001 break;
2002 }
2003
2004 /*
2005 * obtain and verify the current password (OLDAUTHTOK) for
2006 * the user.
2007 */
2008
2009 if (flags & PAM_PRELIM_CHECK) {
2010 time_t pwdlastset_prelim = 0;
2011
2012 /* instruct user what is happening */
2013#define greeting "Changing password for "
2014 Announce = (char *) malloc(sizeof(greeting) + strlen(user));
2015 if (Announce == NULL) {
2016 _pam_log(pamh, ctrl, LOG_CRIT, "password - out of memory");
2017 ret = PAM_BUF_ERR;
2018 goto out;
2019 }
2020 (void) strcpy(Announce, greeting);
2021 (void) strcpy(Announce + sizeof(greeting) - 1, user);
2022#undef greeting
2023
2024 lctrl = ctrl | WINBIND__OLD_PASSWORD;
2025 ret = _winbind_read_password(pamh, lctrl,
2026 Announce,
2027 "(current) NT password: ",
2028 NULL,
2029 (const char **) &pass_old);
2030 if (ret != PAM_SUCCESS) {
2031 _pam_log(pamh, ctrl, LOG_NOTICE, "password - (old) token not obtained");
2032 goto out;
2033 }
2034
2035 /* verify that this is the password for this user */
2036
2037 ret = winbind_auth_request(pamh, ctrl, user, pass_old,
2038 NULL, NULL, &response, &pwdlastset_prelim, NULL);
2039
2040 if (ret != PAM_ACCT_EXPIRED &&
2041 ret != PAM_AUTHTOK_EXPIRED &&
2042 ret != PAM_NEW_AUTHTOK_REQD &&
2043 ret != PAM_SUCCESS) {
2044 pass_old = NULL;
2045 goto out;
2046 }
2047
2048 pam_set_data(pamh, PAM_WINBIND_PWD_LAST_SET, (void *)pwdlastset_prelim, NULL);
2049
2050 ret = pam_set_item(pamh, PAM_OLDAUTHTOK, (const void *) pass_old);
2051 pass_old = NULL;
2052 if (ret != PAM_SUCCESS) {
2053 _pam_log(pamh, ctrl, LOG_CRIT, "failed to set PAM_OLDAUTHTOK");
2054 }
2055 } else if (flags & PAM_UPDATE_AUTHTOK) {
2056
2057 time_t pwdlastset_update = 0;
2058
2059 /*
2060 * obtain the proposed password
2061 */
2062
2063 /*
2064 * get the old token back.
2065 */
2066
2067 ret = _pam_get_item(pamh, PAM_OLDAUTHTOK, &pass_old);
2068
2069 if (ret != PAM_SUCCESS) {
2070 _pam_log(pamh, ctrl, LOG_NOTICE, "user not authenticated");
2071 goto out;
2072 }
2073
2074 lctrl = ctrl & ~WINBIND_TRY_FIRST_PASS_ARG;
2075
2076 if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) {
2077 lctrl |= WINBIND_USE_FIRST_PASS_ARG;
2078 }
2079 retry = 0;
2080 ret = PAM_AUTHTOK_ERR;
2081 while ((ret != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) {
2082 /*
2083 * use_authtok is to force the use of a previously entered
2084 * password -- needed for pluggable password strength checking
2085 */
2086
2087 ret = _winbind_read_password(pamh, lctrl,
2088 NULL,
2089 "Enter new NT password: ",
2090 "Retype new NT password: ",
2091 (const char **) &pass_new);
2092
2093 if (ret != PAM_SUCCESS) {
2094 _pam_log_debug(pamh, ctrl, LOG_ALERT
2095 ,"password - new password not obtained");
2096 pass_old = NULL;/* tidy up */
2097 goto out;
2098 }
2099
2100 /*
2101 * At this point we know who the user is and what they
2102 * propose as their new password. Verify that the new
2103 * password is acceptable.
2104 */
2105
2106 if (pass_new[0] == '\0') {/* "\0" password = NULL */
2107 pass_new = NULL;
2108 }
2109 }
2110
2111 /*
2112 * By reaching here we have approved the passwords and must now
2113 * rebuild the password database file.
2114 */
2115 _pam_get_data( pamh, PAM_WINBIND_PWD_LAST_SET,
2116 &pwdlastset_update);
2117
2118 ret = winbind_chauthtok_request(pamh, ctrl, user, pass_old, pass_new, pwdlastset_update);
2119 if (ret) {
2120 _pam_overwrite(pass_new);
2121 _pam_overwrite(pass_old);
2122 pass_old = pass_new = NULL;
2123 goto out;
2124 }
2125
2126 if (_pam_require_krb5_auth_after_chauthtok(pamh, ctrl, user)) {
2127
2128 const char *member = get_member_from_config(pamh, argc, argv, ctrl, d);
2129 const char *cctype = get_krb5_cc_type_from_config(pamh, argc, argv, ctrl, d);
2130
2131 ret = winbind_auth_request(pamh, ctrl, user, pass_new,
2132 member, cctype, &response, NULL, &username_ret);
2133 _pam_overwrite(pass_new);
2134 _pam_overwrite(pass_old);
2135 pass_old = pass_new = NULL;
2136
2137 if (ret == PAM_SUCCESS) {
2138
2139 /* warn a user if the password is about to expire soon */
2140 _pam_warn_password_expiry(pamh, ctrl, &response, NULL);
2141
2142 /* set some info3 info for other modules in the stack */
2143 _pam_set_data_info3(pamh, ctrl, &response);
2144
2145 /* put krb5ccname into env */
2146 _pam_setup_krb5_env(pamh, ctrl, response.data.auth.krb5ccname);
2147
2148 if (username_ret) {
2149 pam_set_item (pamh, PAM_USER, username_ret);
2150 _pam_log_debug(pamh, ctrl, LOG_INFO, "Returned user was '%s'", username_ret);
2151 free(username_ret);
2152 }
2153 }
2154
2155 goto out;
2156 }
2157 } else {
2158 ret = PAM_SERVICE_ERR;
2159 }
2160
2161out:
2162 if (d) {
2163 iniparser_freedict(d);
2164 }
2165
2166 /* Deal with offline errors. */
2167 PAM_WB_REMARK_CHECK_RESPONSE(pamh, ctrl, response, "NT_STATUS_NO_LOGON_SERVERS");
2168 PAM_WB_REMARK_CHECK_RESPONSE(pamh, ctrl, response, "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND");
2169 PAM_WB_REMARK_CHECK_RESPONSE(pamh, ctrl, response, "NT_STATUS_ACCESS_DENIED");
2170
2171 _PAM_LOG_FUNCTION_LEAVE("pam_sm_chauthtok", pamh, ctrl, ret);
2172
2173 return ret;
2174}
2175
2176#ifdef PAM_STATIC
2177
2178/* static module data */
2179
2180struct pam_module _pam_winbind_modstruct = {
2181 MODULE_NAME,
2182 pam_sm_authenticate,
2183 pam_sm_setcred,
2184 pam_sm_acct_mgmt,
2185 pam_sm_open_session,
2186 pam_sm_close_session,
2187 pam_sm_chauthtok
2188};
2189
2190#endif
2191
2192/*
2193 * Copyright (c) Andrew Tridgell <tridge@samba.org> 2000
2194 * Copyright (c) Tim Potter <tpot@samba.org> 2000
2195 * Copyright (c) Andrew Bartlettt <abartlet@samba.org> 2002
2196 * Copyright (c) Guenther Deschner <gd@samba.org> 2005-2007
2197 * Copyright (c) Jan Rêkorajski 1999.
2198 * Copyright (c) Andrew G. Morgan 1996-8.
2199 * Copyright (c) Alex O. Yuriev, 1996.
2200 * Copyright (c) Cristian Gafton 1996.
2201 * Copyright (C) Elliot Lee <sopwith@redhat.com> 1996, Red Hat Software.
2202 *
2203 * Redistribution and use in source and binary forms, with or without
2204 * modification, are permitted provided that the following conditions
2205 * are met:
2206 * 1. Redistributions of source code must retain the above copyright
2207 * notice, and the entire permission notice in its entirety,
2208 * including the disclaimer of warranties.
2209 * 2. Redistributions in binary form must reproduce the above copyright
2210 * notice, this list of conditions and the following disclaimer in the
2211 * documentation and/or other materials provided with the distribution.
2212 * 3. The name of the author may not be used to endorse or promote
2213 * products derived from this software without specific prior
2214 * written permission.
2215 *
2216 * ALTERNATIVELY, this product may be distributed under the terms of
2217 * the GNU Public License, in which case the provisions of the GPL are
2218 * required INSTEAD OF the above restrictions. (This clause is
2219 * necessary due to a potential bad interaction between the GPL and
2220 * the restrictions contained in a BSD-style copyright.)
2221 *
2222 * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
2223 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
2224 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
2225 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
2226 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
2227 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
2228 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
2229 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
2230 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
2231 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
2232 * OF THE POSSIBILITY OF SUCH DAMAGE.
2233 */
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