1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2010 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 *
25 * Copyright 2014 Nexenta Systems, Inc. All rights reserved.
26 */
27
28 #include <syslog.h>
29 #include <stdlib.h>
30 #include <unistd.h>
31 #include <limits.h>
32 #include <strings.h>
33 #include <synch.h>
34 #include <errno.h>
35 #include <sys/types.h>
36 #include <sys/stat.h>
37 #include <sys/avl.h>
38 #include <fcntl.h>
39 #include <thread.h>
40 #include <pwd.h>
41 #include <dlfcn.h>
42 #include <link.h>
43 #include <assert.h>
44 #include <smbsrv/libsmb.h>
45
46 #define SMB_PASSWD "/var/smb/smbpasswd"
47 #define SMB_OPASSWD "/var/smb/osmbpasswd"
48 #define SMB_PASSTEMP "/var/smb/ptmp"
49 #define SMB_PASSLCK "/var/smb/.pwd.lock"
50
51 #define SMB_PWD_DISABLE "*DIS*"
52 #define SMB_PWD_BUFSIZE 256
53
54 #define S_WAITTIME 15
55
56 typedef enum {
57 SMB_PWD_NAME = 0,
58 SMB_PWD_UID,
59 SMB_PWD_LMHASH,
60 SMB_PWD_NTHASH,
61 SMB_PWD_NARG
62 } smb_pwdarg_t;
63
64 static struct flock flock = { 0, 0, 0, 0, 0, 0 };
65 static pid_t lck_pid = 0; /* process's pid at last lock */
66 static thread_t lck_tid = 0; /* thread that holds the lock */
67 static int fildes = -1;
68 static mutex_t lck_lock = DEFAULTMUTEX;
69 static void *smb_pwd_hdl = NULL;
70
71 static struct {
72 smb_passwd_t *(*pwop_getpwnam)(const char *, smb_passwd_t *);
73 smb_passwd_t *(*pwop_getpwuid)(uid_t, smb_passwd_t *);
74 int (*pwop_setcntl)(const char *, int);
75 int (*pwop_setpasswd)(const char *, const char *);
76 int (*pwop_num)(void);
77 int (*pwop_iteropen)(smb_pwditer_t *);
78 smb_luser_t *(*pwop_iterate)(smb_pwditer_t *);
79 void (*pwop_iterclose)(smb_pwditer_t *);
80 } smb_pwd_ops;
81
82 static int smb_pwd_lock(void);
83 static int smb_pwd_unlock(void);
84 static int smb_pwd_flck(void);
85 static int smb_pwd_fulck(void);
86
87 /*
88 * buffer structure used by smb_pwd_fgetent/smb_pwd_fputent
89 */
90 typedef struct smb_pwbuf {
91 char pw_buf[SMB_PWD_BUFSIZE];
92 smb_passwd_t *pw_pwd;
93 } smb_pwbuf_t;
94
95 /*
96 * flag values used with smb_pwd_fgetent
97 */
98 #define SMB_PWD_GETF_ALL 1 /* get all the account info */
99 #define SMB_PWD_GETF_NOPWD 2 /* password is not needed */
100
101 static smb_pwbuf_t *smb_pwd_fgetent(FILE *, smb_pwbuf_t *, uint32_t);
102 static int smb_pwd_fputent(FILE *, const smb_pwbuf_t *);
103 static int smb_pwd_chgpwent(smb_passwd_t *, const char *, int);
104 static int smb_pwd_update(const char *, const char *, int);
105
106 /*
107 * Local Users Cache
108 *
109 * Simplifying assumptions
110 *
111 * o smbpasswd is a service private file and shouldn't be edited manually
112 * o accounts are only added/modified via passwd and/or smbadm CLIs
113 * o accounts are not removed but disabled using smbadm CLI
114 * o editing smbpasswd manually might result in cache inconsistency
115 *
116 * Cache is created and populated upon service startup.
117 * Cache is updated each time users list is requested if there's been
118 * any change in smbpasswd file. The change criteria is smbpasswd's
119 * modification timestamp.
120 */
121
122 /*
123 * User cache handle
124 */
125 typedef struct smb_uchandle {
126 avl_tree_t uc_cache;
127 rwlock_t uc_cache_lck;
128 timestruc_t uc_timestamp;
129 uint32_t uc_refcnt;
130 uint32_t uc_state;
131 mutex_t uc_mtx;
132 cond_t uc_cv;
133 } smb_uchandle_t;
134
135 #define SMB_UCHS_NOCACHE 0
136 #define SMB_UCHS_CREATED 1
137 #define SMB_UCHS_UPDATING 2
138 #define SMB_UCHS_UPDATED 3
139 #define SMB_UCHS_DESTROYING 4
140
141 /*
142 * User cache node
143 */
144 typedef struct smb_ucnode {
145 smb_luser_t cn_user;
146 avl_node_t cn_link;
147 } smb_ucnode_t;
148
149 static void smb_lucache_create(void);
150 static void smb_lucache_destroy(void);
151 static void smb_lucache_update(void);
152 static int smb_lucache_num(void);
153 static int smb_lucache_lock(void);
154 static void smb_lucache_unlock(void);
155 static int smb_lucache_do_update(void);
156 static void smb_lucache_flush(void);
157
158 static smb_uchandle_t smb_uch;
159
160 /*
161 * smb_pwd_init
162 *
163 * Initializes the cache if requested.
164 * Checks to see if a password management utility library
165 * is interposed. If yes then it'll initializes smb_pwd_ops
166 * structure with function pointers from this library.
167 */
168 void
169 smb_pwd_init(boolean_t create_cache)
170 {
171 if (create_cache) {
172 smb_lucache_create();
173 #if 0
174 /*
175 * This pre-loading of the cache results in idmapd requests.
176 * With the change to allow idmapd to call into libsmb to
177 * map names and SIDs, this creates a circular startup
178 * dependency. This call has been temporarily disabled to
179 * avoid this issue. It can be enabled when the name/SID
180 * lookup can be done directly on the LSA service.
181 */
182 smb_lucache_update();
183 #endif
184 }
185
186 smb_pwd_hdl = smb_dlopen();
187 if (smb_pwd_hdl == NULL)
188 return;
189
190 bzero((void *)&smb_pwd_ops, sizeof (smb_pwd_ops));
191
192 smb_pwd_ops.pwop_getpwnam =
193 (smb_passwd_t *(*)())dlsym(smb_pwd_hdl, "smb_pwd_getpwnam");
194
195 smb_pwd_ops.pwop_getpwuid =
196 (smb_passwd_t *(*)())dlsym(smb_pwd_hdl, "smb_pwd_getpwuid");
197
198 smb_pwd_ops.pwop_setcntl =
199 (int (*)())dlsym(smb_pwd_hdl, "smb_pwd_setcntl");
200
201 smb_pwd_ops.pwop_setpasswd =
202 (int (*)())dlsym(smb_pwd_hdl, "smb_pwd_setpasswd");
203
204 smb_pwd_ops.pwop_num =
205 (int (*)())dlsym(smb_pwd_hdl, "smb_pwd_num");
206
207 smb_pwd_ops.pwop_iteropen =
208 (int (*)())dlsym(smb_pwd_hdl, "smb_pwd_iteropen");
209
210 smb_pwd_ops.pwop_iterclose =
211 (void (*)())dlsym(smb_pwd_hdl, "smb_pwd_iterclose");
212
213 smb_pwd_ops.pwop_iterate =
214 (smb_luser_t *(*)())dlsym(smb_pwd_hdl, "smb_pwd_iterate");
215
216 if (smb_pwd_ops.pwop_getpwnam == NULL ||
217 smb_pwd_ops.pwop_getpwuid == NULL ||
218 smb_pwd_ops.pwop_setcntl == NULL ||
219 smb_pwd_ops.pwop_setpasswd == NULL ||
220 smb_pwd_ops.pwop_num == NULL ||
221 smb_pwd_ops.pwop_iteropen == NULL ||
222 smb_pwd_ops.pwop_iterclose == NULL ||
223 smb_pwd_ops.pwop_iterate == NULL) {
224 smb_dlclose(smb_pwd_hdl);
225 smb_pwd_hdl = NULL;
226
227 /* If error or function(s) are missing, use original lib */
228 bzero((void *)&smb_pwd_ops, sizeof (smb_pwd_ops));
229 }
230 }
231
232 /*
233 * smb_pwd_fini
234 *
235 * Destroys the cache.
236 * Closes interposed library.
237 */
238 void
239 smb_pwd_fini(void)
240 {
241 smb_lucache_destroy();
242 smb_dlclose(smb_pwd_hdl);
243 smb_pwd_hdl = NULL;
244 bzero((void *)&smb_pwd_ops, sizeof (smb_pwd_ops));
245 }
246
247 /*
248 * smb_pwd_getpwnam
249 *
250 * Returns a smb password structure for the given user name.
251 * smbpw is a pointer to a buffer allocated by the caller.
252 *
253 * Returns NULL upon failure.
254 */
255 smb_passwd_t *
256 smb_pwd_getpwnam(const char *name, smb_passwd_t *smbpw)
257 {
258 boolean_t found = B_FALSE;
259 smb_pwbuf_t pwbuf;
260 FILE *fp;
261 int err;
262
263 if (smb_pwd_ops.pwop_getpwnam != NULL)
264 return (smb_pwd_ops.pwop_getpwnam(name, smbpw));
265
266 err = smb_pwd_lock();
267 if (err != SMB_PWE_SUCCESS) {
268 syslog(LOG_WARNING, "smb_pwdutil: lock failed, err=%d", err);
269 return (NULL);
270 }
271
272 if ((fp = fopen(SMB_PASSWD, "rF")) == NULL) {
273 syslog(LOG_WARNING, "smb_pwdutil: open failed, %m");
274 (void) smb_pwd_unlock();
275 return (NULL);
276 }
277
278 pwbuf.pw_pwd = smbpw;
279
280 while (smb_pwd_fgetent(fp, &pwbuf, SMB_PWD_GETF_ALL) != NULL) {
281 if (strcmp(name, smbpw->pw_name) == 0) {
282 found = B_TRUE;
283 break;
284 }
285 }
286
287 (void) fclose(fp);
288 (void) smb_pwd_unlock();
289
290 if (!found) {
291 bzero(smbpw, sizeof (smb_passwd_t));
292 return (NULL);
293 }
294
295 return (smbpw);
296 }
297
298 /*
299 * smb_pwd_getpwuid
300 *
301 * Returns a smb password structure for the given UID
302 * smbpw is a pointer to a buffer allocated by the caller.
303 *
304 * Returns NULL upon failure.
305 */
306 smb_passwd_t *
307 smb_pwd_getpwuid(uid_t uid, smb_passwd_t *smbpw)
308 {
309 boolean_t found = B_FALSE;
310 smb_pwbuf_t pwbuf;
311 FILE *fp;
312 int err;
313
314 if (smb_pwd_ops.pwop_getpwuid != NULL)
315 return (smb_pwd_ops.pwop_getpwuid(uid, smbpw));
316
317 err = smb_pwd_lock();
318 if (err != SMB_PWE_SUCCESS) {
319 syslog(LOG_WARNING, "smb_pwdutil: lock failed, err=%d", err);
320 return (NULL);
321 }
322
323 if ((fp = fopen(SMB_PASSWD, "rF")) == NULL) {
324 syslog(LOG_WARNING, "smb_pwdutil: open failed, %m");
325 (void) smb_pwd_unlock();
326 return (NULL);
327 }
328
329 pwbuf.pw_pwd = smbpw;
330
331 while (smb_pwd_fgetent(fp, &pwbuf, SMB_PWD_GETF_ALL) != NULL) {
332 if (uid == smbpw->pw_uid) {
333 found = B_TRUE;
334 break;
335 }
336 }
337
338 (void) fclose(fp);
339 (void) smb_pwd_unlock();
340
341 if (!found) {
342 bzero(smbpw, sizeof (smb_passwd_t));
343 return (NULL);
344 }
345
346 return (smbpw);
347 }
348
349 /*
350 * smb_pwd_setpasswd
351 *
352 * Update/add the given user to the smbpasswd file.
353 */
354 int
355 smb_pwd_setpasswd(const char *name, const char *password)
356 {
357 if (smb_pwd_ops.pwop_setpasswd != NULL)
358 return (smb_pwd_ops.pwop_setpasswd(name, password));
359
360 return (smb_pwd_update(name, password, 0));
361 }
362
363 /*
364 * smb_pwd_setcntl
365 *
366 * Change the account state. This can be making the account
367 * disable/enable or removing its LM hash.
368 */
369 int
370 smb_pwd_setcntl(const char *name, int control)
371 {
372 if (smb_pwd_ops.pwop_setcntl != NULL)
373 return (smb_pwd_ops.pwop_setcntl(name, control));
374
375 if (control == 0)
376 return (SMB_PWE_SUCCESS);
377
378 return (smb_pwd_update(name, NULL, control));
379 }
380
381 /*
382 * smb_pwd_num
383 *
384 * Returns the number of cached local users
385 */
386 int
387 smb_pwd_num(void)
388 {
389 if (smb_pwd_ops.pwop_num != NULL)
390 return (smb_pwd_ops.pwop_num());
391
392 smb_lucache_update();
393
394 return (smb_lucache_num());
395 }
396
397 /*
398 * smb_pwd_iteropen
399 *
400 * Initalizes the given iterator handle.
401 * This handle will be used to iterate the users cache
402 * by the caller. The cache will be locked for read and it
403 * will remain locked until smb_pwd_iterclose() is called.
404 */
405 int
406 smb_pwd_iteropen(smb_pwditer_t *iter)
407 {
408 if (iter == NULL)
409 return (SMB_PWE_INVALID_PARAM);
410
411 if (smb_pwd_ops.pwop_iteropen != NULL)
412 return (smb_pwd_ops.pwop_iteropen(iter));
413
414 iter->spi_next = NULL;
415
416 smb_lucache_update();
417
418 return (smb_lucache_lock());
419 }
420
421 /*
422 * smb_pwd_iterate
423 *
424 * Scans through users cache using the given iterator
425 */
426 smb_luser_t *
427 smb_pwd_iterate(smb_pwditer_t *iter)
428 {
429 smb_ucnode_t *ucnode;
430
431 if (iter == NULL)
432 return (NULL);
433
434 if (smb_pwd_ops.pwop_iterate != NULL)
435 return (smb_pwd_ops.pwop_iterate(iter));
436
437 if (iter->spi_next == NULL)
438 ucnode = avl_first(&smb_uch.uc_cache);
439 else
440 ucnode = AVL_NEXT(&smb_uch.uc_cache, iter->spi_next);
441
442 if ((iter->spi_next = ucnode) != NULL)
443 return (&ucnode->cn_user);
444
445 return (NULL);
446 }
447
448 /*
449 * smb_pwd_iterclose
450 *
451 * Closes the given iterator. Effectively it only unlocks the cache
452 */
453 void
454 smb_pwd_iterclose(smb_pwditer_t *iter)
455 {
456 if (smb_pwd_ops.pwop_iterclose != NULL) {
457 smb_pwd_ops.pwop_iterclose(iter);
458 return;
459 }
460
461 if (iter != NULL)
462 smb_lucache_unlock();
463 }
464
465 /*
466 * smb_pwd_update
467 *
468 * Updates the password entry of the given user if the user already
469 * has an entry, otherwise it'll add an entry for the user with
470 * given password and control information.
471 */
472 static int
473 smb_pwd_update(const char *name, const char *password, int control)
474 {
475 struct stat64 stbuf;
476 FILE *src, *dst;
477 int tempfd;
478 int err = SMB_PWE_SUCCESS;
479 smb_pwbuf_t pwbuf;
480 smb_passwd_t smbpw;
481 boolean_t newent = B_TRUE;
482 boolean_t user_disable = B_FALSE;
483 char uxbuf[1024];
484 struct passwd uxpw;
485 int64_t lm_level;
486
487 err = smb_pwd_lock();
488 if (err != SMB_PWE_SUCCESS)
489 return (err);
490
491 if (stat64(SMB_PASSWD, &stbuf) < 0) {
492 err = SMB_PWE_STAT_FAILED;
493 goto passwd_exit;
494 }
495
496 if ((tempfd = open(SMB_PASSTEMP, O_WRONLY|O_CREAT|O_TRUNC, 0600)) < 0) {
497 err = SMB_PWE_OPEN_FAILED;
498 goto passwd_exit;
499 }
500
501 if ((dst = fdopen(tempfd, "wF")) == NULL) {
502 err = SMB_PWE_OPEN_FAILED;
503 goto passwd_exit;
504 }
505
506 if ((src = fopen(SMB_PASSWD, "rF")) == NULL) {
507 err = SMB_PWE_OPEN_FAILED;
508 (void) fclose(dst);
509 (void) unlink(SMB_PASSTEMP);
510 goto passwd_exit;
511 }
512
513 if (smb_config_getnum(SMB_CI_LM_LEVEL, &lm_level) != SMBD_SMF_OK)
514 lm_level = 4;
515
516 if (lm_level >= 4)
517 control |= SMB_PWC_NOLM;
518
519 pwbuf.pw_pwd = &smbpw;
520
521 /*
522 * copy old password entries to temporary file while replacing
523 * the entry that matches "name"
524 */
525 while (smb_pwd_fgetent(src, &pwbuf, SMB_PWD_GETF_ALL) != NULL) {
526 if (strcmp(smbpw.pw_name, name) == 0) {
527 err = smb_pwd_chgpwent(&smbpw, password, control);
528 if (err == SMB_PWE_USER_DISABLE)
529 user_disable = B_TRUE;
530 err = smb_pwd_fputent(dst, &pwbuf);
531 newent = B_FALSE;
532 } else {
533 err = smb_pwd_fputent(dst, &pwbuf);
534 }
535
536 if (err != SMB_PWE_SUCCESS) {
537 (void) fclose(src);
538 (void) fclose(dst);
539 goto passwd_exit;
540 }
541 }
542
543 if (newent) {
544 if (getpwnam_r(name, &uxpw, uxbuf, sizeof (uxbuf))) {
545 bzero(&smbpw, sizeof (smb_passwd_t));
546 (void) strlcpy(smbpw.pw_name, uxpw.pw_name,
547 sizeof (smbpw.pw_name));
548 smbpw.pw_uid = uxpw.pw_uid;
549 (void) smb_pwd_chgpwent(&smbpw, password, control);
550 err = smb_pwd_fputent(dst, &pwbuf);
551 } else {
552 err = SMB_PWE_USER_UNKNOWN;
553 }
554
555 if (err != SMB_PWE_SUCCESS) {
556 (void) fclose(src);
557 (void) fclose(dst);
558 goto passwd_exit;
559 }
560 }
561
562 (void) fclose(src);
563 if (fclose(dst) != 0) {
564 err = SMB_PWE_CLOSE_FAILED;
565 goto passwd_exit; /* Don't trust the temporary file */
566 }
567
568 /* Rename temp to passwd */
569 if (unlink(SMB_OPASSWD) && access(SMB_OPASSWD, 0) == 0) {
570 err = SMB_PWE_UPDATE_FAILED;
571 (void) unlink(SMB_PASSTEMP);
572 goto passwd_exit;
573 }
574
575 if (link(SMB_PASSWD, SMB_OPASSWD) == -1) {
576 err = SMB_PWE_UPDATE_FAILED;
577 (void) unlink(SMB_PASSTEMP);
578 goto passwd_exit;
579 }
580
581 if (rename(SMB_PASSTEMP, SMB_PASSWD) == -1) {
582 err = SMB_PWE_UPDATE_FAILED;
583 (void) unlink(SMB_PASSTEMP);
584 goto passwd_exit;
585 }
586
587 (void) chmod(SMB_PASSWD, 0400);
588
589 passwd_exit:
590 (void) smb_pwd_unlock();
591 if ((err == SMB_PWE_SUCCESS) && user_disable)
592 err = SMB_PWE_USER_DISABLE;
593
594 return (err);
595 }
596
597 /*
598 * smb_pwd_fgetent
599 *
600 * Parse the buffer in the passed pwbuf and fill in the
601 * smb password structure to point to the parsed information.
602 * The entry format is:
603 *
604 * <user-name>:<user-id>:<LM hash>:<NTLM hash>
605 *
606 * Returns a pointer to the passed pwbuf structure on success,
607 * otherwise returns NULL.
608 */
609 static smb_pwbuf_t *
610 smb_pwd_fgetent(FILE *fp, smb_pwbuf_t *pwbuf, uint32_t flags)
611 {
612 char *argv[SMB_PWD_NARG];
613 char *pwentry;
614 smb_passwd_t *pw;
615 smb_pwdarg_t i;
616 int lm_len, nt_len;
617
618 pwentry = pwbuf->pw_buf;
619 if (fgets(pwentry, SMB_PWD_BUFSIZE, fp) == NULL)
620 return (NULL);
621 (void) trim_whitespace(pwentry);
622
623 for (i = 0; i < SMB_PWD_NARG; ++i) {
624 if ((argv[i] = strsep((char **)&pwentry, ":")) == NULL)
625 return (NULL);
626 }
627
628 if ((*argv[SMB_PWD_NAME] == '\0') || (*argv[SMB_PWD_UID] == '\0'))
629 return (NULL);
630
631 pw = pwbuf->pw_pwd;
632 bzero(pw, sizeof (smb_passwd_t));
633 pw->pw_uid = strtoul(argv[SMB_PWD_UID], 0, 10);
634 (void) strlcpy(pw->pw_name, argv[SMB_PWD_NAME], sizeof (pw->pw_name));
635
636 if (strcmp(argv[SMB_PWD_LMHASH], SMB_PWD_DISABLE) == 0) {
637 pw->pw_flags |= SMB_PWF_DISABLE;
638 if (flags != SMB_PWD_GETF_NOPWD) {
639 (void) strcpy((char *)pw->pw_lmhash, SMB_PWD_DISABLE);
640 (void) strcpy((char *)pw->pw_nthash, SMB_PWD_DISABLE);
641 }
642 return (pwbuf);
643 }
644
645 if (flags == SMB_PWD_GETF_NOPWD)
646 return (pwbuf);
647
648 lm_len = strlen(argv[SMB_PWD_LMHASH]);
649 if (lm_len == SMBAUTH_HEXHASH_SZ) {
650 (void) hextobin(argv[SMB_PWD_LMHASH], SMBAUTH_HEXHASH_SZ,
651 (char *)pw->pw_lmhash, SMBAUTH_HASH_SZ);
652
653 pw->pw_flags |= SMB_PWF_LM;
654 } else if (lm_len != 0) {
655 return (NULL);
656 }
657
658 nt_len = strlen(argv[SMB_PWD_NTHASH]);
659 if (nt_len == SMBAUTH_HEXHASH_SZ) {
660 (void) hextobin(argv[SMB_PWD_NTHASH], SMBAUTH_HEXHASH_SZ,
661 (char *)pw->pw_nthash, SMBAUTH_HASH_SZ);
662
663 pw->pw_flags |= SMB_PWF_NT;
664 } else if (nt_len != 0) {
665 return (NULL);
666 }
667
668 return (pwbuf);
669 }
670
671 /*
672 * smb_pwd_chgpwent
673 *
674 * Updates the given smb_passwd_t structure with given password and
675 * control information.
676 */
677 static int
678 smb_pwd_chgpwent(smb_passwd_t *smbpw, const char *password, int control)
679 {
680 if (control & SMB_PWC_DISABLE) {
681 /* disable the user */
682 smbpw->pw_flags |= SMB_PWF_DISABLE;
683 (void) strcpy((char *)smbpw->pw_lmhash, SMB_PWD_DISABLE);
684 (void) strcpy((char *)smbpw->pw_nthash, SMB_PWD_DISABLE);
685 smbpw->pw_flags &= ~(SMB_PWF_LM | SMB_PWF_NT);
686 return (SMB_PWE_SUCCESS);
687 }
688
689 if ((control & SMB_PWC_ENABLE) && (smbpw->pw_flags & SMB_PWF_DISABLE)) {
690 /* enable the user if it's been disabled */
691 *smbpw->pw_lmhash = '\0';
692 *smbpw->pw_nthash = '\0';
693 smbpw->pw_flags &= ~(SMB_PWF_LM | SMB_PWF_NT);
694 return (SMB_PWE_SUCCESS);
695 }
696
697 /* No password update if account is disabled */
698 if (smbpw->pw_flags & SMB_PWF_DISABLE)
699 return (SMB_PWE_USER_DISABLE);
700
701 /* This call was just to update the control flags */
702 if (password == NULL)
703 return (SMB_PWE_SUCCESS);
704
705 if (control & SMB_PWC_NOLM) {
706 /* LM hash should not be present */
707 smbpw->pw_flags &= ~SMB_PWF_LM;
708 *smbpw->pw_lmhash = '\0';
709 } else {
710 smbpw->pw_flags |= SMB_PWF_LM;
711 (void) smb_auth_lm_hash(password, smbpw->pw_lmhash);
712 }
713
714 smbpw->pw_flags |= SMB_PWF_NT;
715 (void) smb_auth_ntlm_hash(password, smbpw->pw_nthash);
716 return (SMB_PWE_SUCCESS);
717 }
718
719 /*
720 * smb_pwd_fputent
721 *
722 * If LM/NTLM hash are present, converts them to hex string
723 * and write them along with user's name and Id to the smbpasswd
724 * file.
725 */
726 static int
727 smb_pwd_fputent(FILE *fp, const smb_pwbuf_t *pwbuf)
728 {
729 smb_passwd_t *pw = pwbuf->pw_pwd;
730 char hex_nthash[SMBAUTH_HEXHASH_SZ+1];
731 char hex_lmhash[SMBAUTH_HEXHASH_SZ+1];
732 int rc;
733
734 if ((pw->pw_flags & SMB_PWF_LM) == SMB_PWF_LM) {
735 (void) bintohex((char *)pw->pw_lmhash, SMBAUTH_HASH_SZ,
736 hex_lmhash, SMBAUTH_HEXHASH_SZ);
737 hex_lmhash[SMBAUTH_HEXHASH_SZ] = '\0';
738 } else {
739 (void) strcpy(hex_lmhash, (char *)pw->pw_lmhash);
740 }
741
742 if ((pw->pw_flags & SMB_PWF_NT) == SMB_PWF_NT) {
743 (void) bintohex((char *)pw->pw_nthash, SMBAUTH_HASH_SZ,
744 hex_nthash, SMBAUTH_HEXHASH_SZ);
745 hex_nthash[SMBAUTH_HEXHASH_SZ] = '\0';
746 } else {
747 (void) strcpy(hex_nthash, (char *)pw->pw_nthash);
748 }
749
750 rc = fprintf(fp, "%s:%u:%s:%s\n", pw->pw_name, pw->pw_uid,
751 hex_lmhash, hex_nthash);
752
753 if (rc <= 0)
754 return (SMB_PWE_WRITE_FAILED);
755
756 return (SMB_PWE_SUCCESS);
757 }
758
759 /*
760 * smb_pwd_lock
761 *
762 * A wrapper around smb_pwd_flck() which locks smb password
763 * file so that only one thread at a time is operational.
764 */
765 static int
766 smb_pwd_lock(void)
767 {
768 int res;
769
770 if (smb_pwd_flck()) {
771 switch (errno) {
772 case EINTR:
773 res = SMB_PWE_BUSY;
774 break;
775 case EACCES:
776 res = SMB_PWE_DENIED;
777 break;
778 case 0:
779 res = SMB_PWE_SUCCESS;
780 break;
781 }
782 } else
783 res = SMB_PWE_SUCCESS;
784
785 return (res);
786 }
787
788 /*
789 * smb_pwd_unlock
790 *
791 * A wrapper around smb_pwd_fulck() which unlocks
792 * smb password file.
793 */
794 static int
795 smb_pwd_unlock(void)
796 {
797 if (smb_pwd_fulck())
798 return (SMB_PWE_SYSTEM_ERROR);
799
800 return (SMB_PWE_SUCCESS);
801 }
802
803 /*
804 * smb_pwd_flck
805 *
806 * Creates a lock file and grabs an exclusive (write) lock on it.
807 */
808 static int
809 smb_pwd_flck(void)
810 {
811 int seconds = 0;
812
813 (void) mutex_lock(&lck_lock);
814 for (;;) {
815 if (lck_pid != 0 && lck_pid != getpid()) {
816 /* somebody forked */
817 lck_pid = 0;
818 lck_tid = 0;
819 }
820
821 if (lck_tid == 0) {
822 if ((fildes = creat(SMB_PASSLCK, 0600)) == -1)
823 break;
824 flock.l_type = F_WRLCK;
825 if (fcntl(fildes, F_SETLK, &flock) != -1) {
826 lck_pid = getpid();
827 lck_tid = thr_self();
828 (void) mutex_unlock(&lck_lock);
829 return (0);
830 }
831 (void) close(fildes);
832 fildes = -1;
833 }
834
835 if (seconds++ >= S_WAITTIME) {
836 /*
837 * For compatibility with the past, pretend
838 * that we were interrupted by SIGALRM.
839 */
840 errno = EINTR;
841 break;
842 }
843
844 (void) mutex_unlock(&lck_lock);
845 (void) sleep(1);
846 (void) mutex_lock(&lck_lock);
847 }
848 (void) mutex_unlock(&lck_lock);
849
850 return (-1);
851 }
852
853 /*
854 * smb_pwd_fulck
855 *
856 * Unlocks smb password file for operations done via
857 * this library APIs.
858 */
859 static int
860 smb_pwd_fulck(void)
861 {
862 (void) mutex_lock(&lck_lock);
863 if (lck_tid == thr_self() && fildes >= 0) {
864 flock.l_type = F_UNLCK;
865 (void) fcntl(fildes, F_SETLK, &flock);
866 (void) close(fildes);
867 fildes = -1;
868 lck_pid = 0;
869 lck_tid = 0;
870 (void) mutex_unlock(&lck_lock);
871 return (0);
872 }
873 (void) mutex_unlock(&lck_lock);
874 return (-1);
875 }
876
877 /*
878 * Local User Cache Functions
879 *
880 * Local user cache is implemented using AVL tree
881 */
882
883 /*
884 * smb_lucache_cmp
885 *
886 * AVL compare function, the key is username.
887 */
888 static int
889 smb_lucache_cmp(const void *p1, const void *p2)
890 {
891 smb_ucnode_t *u1 = (smb_ucnode_t *)p1;
892 smb_ucnode_t *u2 = (smb_ucnode_t *)p2;
893 int rc;
894
895 rc = strcmp(u1->cn_user.su_name, u2->cn_user.su_name);
896
897 if (rc < 0)
898 return (-1);
899
900 if (rc > 0)
901 return (1);
902
903 return (0);
904 }
905
906 /*
907 * smb_lucache_update
908 *
909 * Updates the cache if needed. Whether an update is needed
910 * is determined based on smbpasswd file modification timestamp
911 */
912 static void
913 smb_lucache_update(void)
914 {
915 struct stat64 stbuf;
916 int rc;
917
918 (void) mutex_lock(&smb_uch.uc_mtx);
919 switch (smb_uch.uc_state) {
920 default:
921 case SMB_UCHS_NOCACHE:
922 assert(0);
923 (void) mutex_unlock(&smb_uch.uc_mtx);
924 return;
925
926 case SMB_UCHS_CREATED:
927 case SMB_UCHS_UPDATED:
928 break;
929
930 case SMB_UCHS_UPDATING:
931 /* Want only one thread executing this function at a time */
932 (void) mutex_unlock(&smb_uch.uc_mtx);
933 return;
934
935 case SMB_UCHS_DESTROYING:
936 (void) mutex_unlock(&smb_uch.uc_mtx);
937 return;
938 }
939
940 /*
941 * smb_pwd_lock() is not called here so it can
942 * be checked quickly whether an updated is needed
943 */
944 if (stat64(SMB_PASSWD, &stbuf) < 0) {
945 (void) mutex_unlock(&smb_uch.uc_mtx);
946 if (errno != ENOENT)
947 return;
948
949 /* no smbpasswd file; empty the cache */
950 smb_lucache_flush();
951 return;
952 }
953
954 if (stbuf.st_size == 0) {
955 (void) mutex_unlock(&smb_uch.uc_mtx);
956
957 /* empty smbpasswd file; empty the cache */
958 smb_lucache_flush();
959 return;
960 }
961
962 if ((smb_uch.uc_timestamp.tv_sec == stbuf.st_mtim.tv_sec) &&
963 (smb_uch.uc_timestamp.tv_nsec == stbuf.st_mtim.tv_nsec)) {
964 (void) mutex_unlock(&smb_uch.uc_mtx);
965 /* No changes since the last cache update */
966 return;
967 }
968
969 smb_uch.uc_state = SMB_UCHS_UPDATING;
970 smb_uch.uc_refcnt++;
971 (void) mutex_unlock(&smb_uch.uc_mtx);
972
973 rc = smb_lucache_do_update();
974
975 (void) mutex_lock(&smb_uch.uc_mtx);
976 if ((rc == SMB_PWE_SUCCESS) && (stat64(SMB_PASSWD, &stbuf) == 0))
977 smb_uch.uc_timestamp = stbuf.st_mtim;
978 smb_uch.uc_state = SMB_UCHS_UPDATED;
979 smb_uch.uc_refcnt--;
980 (void) cond_broadcast(&smb_uch.uc_cv);
981 (void) mutex_unlock(&smb_uch.uc_mtx);
982 }
983
984 /*
985 * smb_lucache_do_update
986 *
987 * This function takes care of updating the AVL tree.
988 * If an entry has been updated, it'll be modified in place.
989 *
990 * New entries will be added to a temporary AVL tree then
991 * passwod file is unlocked and all the new entries will
992 * be transferred to the main cache from the temporary tree.
993 *
994 * This function MUST NOT be called directly
995 */
996 static int
997 smb_lucache_do_update(void)
998 {
999 avl_tree_t tmp_cache;
1000 smb_pwbuf_t pwbuf;
1001 smb_passwd_t smbpw;
1002 smb_ucnode_t uc_node;
1003 smb_ucnode_t *uc_newnode;
1004 smb_luser_t *user;
1005 smb_sid_t *sid;
1006 idmap_stat idm_stat;
1007 int rc = SMB_PWE_SUCCESS;
1008 void *cookie = NULL;
1009 FILE *fp;
1010
1011 if ((rc = smb_pwd_lock()) != SMB_PWE_SUCCESS) {
1012 syslog(LOG_WARNING, "smb_pwdutil: lock failed, err=%d", rc);
1013 return (rc);
1014 }
1015
1016 if ((fp = fopen(SMB_PASSWD, "rF")) == NULL) {
1017 syslog(LOG_WARNING, "smb_pwdutil: open failed, %m");
1018 (void) smb_pwd_unlock();
1019 return (SMB_PWE_OPEN_FAILED);
1020 }
1021
1022 avl_create(&tmp_cache, smb_lucache_cmp,
1023 sizeof (smb_ucnode_t), offsetof(smb_ucnode_t, cn_link));
1024
1025 bzero(&pwbuf, sizeof (smb_pwbuf_t));
1026 pwbuf.pw_pwd = &smbpw;
1027
1028 (void) rw_rdlock(&smb_uch.uc_cache_lck);
1029
1030 while (smb_pwd_fgetent(fp, &pwbuf, SMB_PWD_GETF_NOPWD) != NULL) {
1031 uc_node.cn_user.su_name = smbpw.pw_name;
1032 uc_newnode = avl_find(&smb_uch.uc_cache, &uc_node, NULL);
1033 if (uc_newnode) {
1034 /* update the node info */
1035 uc_newnode->cn_user.su_ctrl = smbpw.pw_flags;
1036 continue;
1037 }
1038
1039 /* create a new node */
1040 if ((uc_newnode = malloc(sizeof (smb_ucnode_t))) == NULL) {
1041 rc = SMB_PWE_NO_MEMORY;
1042 break;
1043 }
1044
1045 bzero(uc_newnode, sizeof (smb_ucnode_t));
1046 user = &uc_newnode->cn_user;
1047 user->su_ctrl = smbpw.pw_flags;
1048
1049 idm_stat = smb_idmap_getsid(smbpw.pw_uid, SMB_IDMAP_USER, &sid);
1050 if (idm_stat != IDMAP_SUCCESS) {
1051 syslog(LOG_WARNING, "smb_pwdutil: couldn't obtain SID "
1052 "for uid=%u (%d)", smbpw.pw_uid, idm_stat);
1053 free(uc_newnode);
1054 continue;
1055 }
1056 (void) smb_sid_getrid(sid, &user->su_rid);
1057 smb_sid_free(sid);
1058
1059 user->su_name = strdup(smbpw.pw_name);
1060 if (user->su_name == NULL) {
1061 rc = SMB_PWE_NO_MEMORY;
1062 free(uc_newnode);
1063 break;
1064 }
1065
1066 avl_add(&tmp_cache, uc_newnode);
1067 }
1068
1069 (void) rw_unlock(&smb_uch.uc_cache_lck);
1070 (void) fclose(fp);
1071 (void) smb_pwd_unlock();
1072
1073 /* Destroy the temporary list */
1074 (void) rw_wrlock(&smb_uch.uc_cache_lck);
1075 while ((uc_newnode = avl_destroy_nodes(&tmp_cache, &cookie)) != NULL) {
1076 avl_add(&smb_uch.uc_cache, uc_newnode);
1077 }
1078 (void) rw_unlock(&smb_uch.uc_cache_lck);
1079
1080 avl_destroy(&tmp_cache);
1081
1082 return (rc);
1083 }
1084
1085 /*
1086 * smb_lucache_create
1087 *
1088 * Creates the AVL tree and initializes the global user cache handle.
1089 * This function doesn't populate the cache.
1090 * User cache is only created by smbd at startup
1091 */
1092 static void
1093 smb_lucache_create(void)
1094 {
1095 (void) mutex_lock(&smb_uch.uc_mtx);
1096 if (smb_uch.uc_state != SMB_UCHS_NOCACHE) {
1097 (void) mutex_unlock(&smb_uch.uc_mtx);
1098 return;
1099 }
1100
1101 avl_create(&smb_uch.uc_cache, smb_lucache_cmp,
1102 sizeof (smb_ucnode_t), offsetof(smb_ucnode_t, cn_link));
1103
1104 smb_uch.uc_state = SMB_UCHS_CREATED;
1105 bzero(&smb_uch.uc_timestamp, sizeof (timestruc_t));
1106 smb_uch.uc_refcnt = 0;
1107 (void) mutex_unlock(&smb_uch.uc_mtx);
1108 }
1109
1110 /*
1111 * smb_lucache_flush
1112 *
1113 * Removes and frees all the cache entries
1114 */
1115 static void
1116 smb_lucache_flush(void)
1117 {
1118 void *cookie = NULL;
1119 smb_ucnode_t *ucnode;
1120
1121 (void) rw_wrlock(&smb_uch.uc_cache_lck);
1122 while ((ucnode = avl_destroy_nodes(&smb_uch.uc_cache, &cookie))
1123 != NULL) {
1124 free(ucnode->cn_user.su_name);
1125 free(ucnode->cn_user.su_fullname);
1126 free(ucnode->cn_user.su_desc);
1127 free(ucnode);
1128 }
1129 (void) rw_unlock(&smb_uch.uc_cache_lck);
1130 }
1131
1132 /*
1133 * smb_lucache_destroy
1134 *
1135 * Destroys the cache.
1136 * This function is only called in smb_pwd_fini()
1137 * User cache is only destroyed by smbd upon shutdown
1138 */
1139 static void
1140 smb_lucache_destroy(void)
1141 {
1142 (void) mutex_lock(&smb_uch.uc_mtx);
1143 switch (smb_uch.uc_state) {
1144 case SMB_UCHS_NOCACHE:
1145 case SMB_UCHS_DESTROYING:
1146 (void) mutex_unlock(&smb_uch.uc_mtx);
1147 return;
1148
1149 default:
1150 break;
1151 }
1152
1153 smb_uch.uc_state = SMB_UCHS_DESTROYING;
1154
1155 while (smb_uch.uc_refcnt > 0)
1156 (void) cond_wait(&smb_uch.uc_cv, &smb_uch.uc_mtx);
1157
1158 smb_lucache_flush();
1159
1160 avl_destroy(&smb_uch.uc_cache);
1161 smb_uch.uc_state = SMB_UCHS_NOCACHE;
1162 (void) mutex_unlock(&smb_uch.uc_mtx);
1163 }
1164
1165 /*
1166 * smb_lucache_lock
1167 *
1168 * Locks the user cache for reading and also
1169 * increment the handle reference count.
1170 */
1171 static int
1172 smb_lucache_lock(void)
1173 {
1174 (void) mutex_lock(&smb_uch.uc_mtx);
1175 switch (smb_uch.uc_state) {
1176 case SMB_UCHS_NOCACHE:
1177 assert(0);
1178 (void) mutex_unlock(&smb_uch.uc_mtx);
1179 return (SMB_PWE_DENIED);
1180
1181 case SMB_UCHS_DESTROYING:
1182 (void) mutex_unlock(&smb_uch.uc_mtx);
1183 return (SMB_PWE_DENIED);
1184 }
1185 smb_uch.uc_refcnt++;
1186 (void) mutex_unlock(&smb_uch.uc_mtx);
1187
1188 (void) rw_rdlock(&smb_uch.uc_cache_lck);
1189 return (SMB_PWE_SUCCESS);
1190 }
1191
1192 /*
1193 * smb_lucache_unlock
1194 *
1195 * Unlock the cache
1196 */
1197 static void
1198 smb_lucache_unlock(void)
1199 {
1200 (void) rw_unlock(&smb_uch.uc_cache_lck);
1201
1202 (void) mutex_lock(&smb_uch.uc_mtx);
1203 smb_uch.uc_refcnt--;
1204 (void) cond_broadcast(&smb_uch.uc_cv);
1205 (void) mutex_unlock(&smb_uch.uc_mtx);
1206 }
1207
1208 /*
1209 * smb_lucache_num
1210 *
1211 * Returns the number of cache entries
1212 */
1213 static int
1214 smb_lucache_num(void)
1215 {
1216 int num;
1217
1218 (void) mutex_lock(&smb_uch.uc_mtx);
1219 switch (smb_uch.uc_state) {
1220 case SMB_UCHS_NOCACHE:
1221 assert(0);
1222 (void) mutex_unlock(&smb_uch.uc_mtx);
1223 return (0);
1224
1225 case SMB_UCHS_DESTROYING:
1226 (void) mutex_unlock(&smb_uch.uc_mtx);
1227 return (0);
1228 }
1229 (void) mutex_unlock(&smb_uch.uc_mtx);
1230
1231 (void) rw_rdlock(&smb_uch.uc_cache_lck);
1232 num = (int)avl_numnodes(&smb_uch.uc_cache);
1233 (void) rw_unlock(&smb_uch.uc_cache_lck);
1234
1235 return (num);
1236 }