1 /* $NetBSD: pwcache.c,v 1.31 2010/03/23 20:28:59 drochner Exp $ */
4 * Copyright (c) 1992 Keith Muller.
5 * Copyright (c) 1992, 1993
6 * The Regents of the University of California. All rights reserved.
8 * This code is derived from software contributed to Berkeley by
9 * Keith Muller of the University of California, San Diego.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * Copyright (c) 2002 The NetBSD Foundation, Inc.
38 * All rights reserved.
40 * Redistribution and use in source and binary forms, with or without
41 * modification, are permitted provided that the following conditions
43 * 1. Redistributions of source code must retain the above copyright
44 * notice, this list of conditions and the following disclaimer.
45 * 2. Redistributions in binary form must reproduce the above copyright
46 * notice, this list of conditions and the following disclaimer in the
47 * documentation and/or other materials provided with the distribution.
49 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
50 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
51 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
52 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
53 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
54 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
55 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
56 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
57 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
58 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
59 * POSSIBILITY OF SUCH DAMAGE.
62 #if HAVE_NBTOOL_CONFIG_H
63 #include "nbtool_config.h"
65 * XXX Undefine the renames of these functions so that we don't
66 * XXX rename the versions found in the host's <pwd.h> by mistake!
72 #include <sys/cdefs.h>
73 #if defined(LIBC_SCCS) && !defined(lint)
75 static char sccsid[] = "@(#)cache.c 8.1 (Berkeley) 5/31/93";
77 __RCSID("$NetBSD: pwcache.c,v 1.31 2010/03/23 20:28:59 drochner Exp $");
79 #endif /* LIBC_SCCS and not lint */
81 #include "namespace.h"
83 #include <sys/types.h>
84 #include <sys/param.h>
94 #if HAVE_NBTOOL_CONFIG_H
95 /* XXX Now, re-apply the renaming that we undid above. */
96 #define group_from_gid __nbcompat_group_from_gid
97 #define user_from_uid __nbcompat_user_from_uid
101 __weak_alias(user_from_uid,_user_from_uid)
102 __weak_alias(group_from_gid,_group_from_gid)
103 __weak_alias(pwcache_groupdb,_pwcache_groupdb)
106 #if !HAVE_PWCACHE_USERDB || HAVE_NBTOOL_CONFIG_H
110 * routines that control user, group, uid and gid caches (for the archive
111 * member print routine).
113 * these routines cache BOTH hits and misses, a major performance improvement
117 * function pointers to various name lookup routines.
118 * these may be changed as necessary.
120 static int (*_pwcache_setgroupent)(int) = setgroupent;
121 static void (*_pwcache_endgrent)(void) = endgrent;
122 static struct group * (*_pwcache_getgrnam)(const char *) = getgrnam;
123 static struct group * (*_pwcache_getgrgid)(gid_t) = getgrgid;
124 static int (*_pwcache_setpassent)(int) = setpassent;
125 static void (*_pwcache_endpwent)(void) = endpwent;
126 static struct passwd * (*_pwcache_getpwnam)(const char *) = getpwnam;
127 static struct passwd * (*_pwcache_getpwuid)(uid_t) = getpwuid;
132 static int pwopn; /* is password file open */
133 static int gropn; /* is group file open */
134 static UIDC **uidtb; /* uid to name cache */
135 static GIDC **gidtb; /* gid to name cache */
136 static UIDC **usrtb; /* user name to uid cache */
137 static GIDC **grptb; /* group name to gid cache */
139 static int uidtb_fail; /* uidtb_start() failed ? */
140 static int gidtb_fail; /* gidtb_start() failed ? */
141 static int usrtb_fail; /* usrtb_start() failed ? */
142 static int grptb_fail; /* grptb_start() failed ? */
145 static u_int st_hash(const char *, size_t, int);
146 static int uidtb_start(void);
147 static int gidtb_start(void);
148 static int usrtb_start(void);
149 static int grptb_start(void);
153 st_hash(const char *name, size_t len, int tabsz)
157 _DIAGASSERT(name != NULL);
161 key = (key << 8) | (key >> 24);
164 return (key % tabsz);
169 * creates an an empty uidtb
171 * 0 if ok, -1 otherwise
181 if ((uidtb = (UIDC **)calloc(UID_SZ, sizeof(UIDC *))) == NULL) {
190 * creates an an empty gidtb
192 * 0 if ok, -1 otherwise
202 if ((gidtb = (GIDC **)calloc(GID_SZ, sizeof(GIDC *))) == NULL) {
211 * creates an an empty usrtb
213 * 0 if ok, -1 otherwise
223 if ((usrtb = (UIDC **)calloc(UNM_SZ, sizeof(UIDC *))) == NULL) {
232 * creates an an empty grptb
234 * 0 if ok, -1 otherwise
244 if ((grptb = (GIDC **)calloc(GNM_SZ, sizeof(GIDC *))) == NULL) {
253 * caches the name (if any) for the uid. If noname clear, we always
254 * return the stored name (if valid or invalid match).
255 * We use a simple hash table.
257 * Pointer to stored name (or a empty string)
260 user_from_uid(uid_t uid, int noname)
265 if ((uidtb == NULL) && (uidtb_start() < 0))
269 * see if we have this uid cached
271 pptr = uidtb + (uid % UID_SZ);
274 if ((ptr != NULL) && (ptr->valid > 0) && (ptr->uid == uid)) {
276 * have an entry for this uid
278 if (!noname || (ptr->valid == VALID))
284 * No entry for this uid, we will add it
287 if (_pwcache_setpassent != NULL)
288 (*_pwcache_setpassent)(1);
293 *pptr = ptr = (UIDC *)malloc(sizeof(UIDC));
295 if ((pw = (*_pwcache_getpwuid)(uid)) == NULL) {
297 * no match for this uid in the local password file
298 * a string that is the uid in numeric format
303 snprintf(ptr->name, UNMLEN, "%lu", (long) uid);
304 ptr->valid = INVALID;
309 * there is an entry for this uid in the password file
312 return (pw->pw_name);
314 strlcpy(ptr->name, pw->pw_name, UNMLEN);
322 * caches the name (if any) for the gid. If noname clear, we always
323 * return the stored name (if valid or invalid match).
324 * We use a simple hash table.
326 * Pointer to stored name (or a empty string)
329 group_from_gid(gid_t gid, int noname)
334 if ((gidtb == NULL) && (gidtb_start() < 0))
338 * see if we have this gid cached
340 pptr = gidtb + (gid % GID_SZ);
343 if ((ptr != NULL) && (ptr->valid > 0) && (ptr->gid == gid)) {
345 * have an entry for this gid
347 if (!noname || (ptr->valid == VALID))
353 * No entry for this gid, we will add it
356 if (_pwcache_setgroupent != NULL)
357 (*_pwcache_setgroupent)(1);
362 *pptr = ptr = (GIDC *)malloc(sizeof(GIDC));
364 if ((gr = (*_pwcache_getgrgid)(gid)) == NULL) {
366 * no match for this gid in the local group file, put in
367 * a string that is the gid in numberic format
372 snprintf(ptr->name, GNMLEN, "%lu", (long) gid);
373 ptr->valid = INVALID;
378 * there is an entry for this group in the group file
381 return (gr->gr_name);
383 strlcpy(ptr->name, gr->gr_name, GNMLEN);
391 * caches the uid for a given user name. We use a simple hash table.
393 * the uid (if any) for a user name, or a -1 if no match can be found
396 uid_from_user(const char *name, uid_t *uid)
403 * return -1 for mangled names
405 if (name == NULL || ((namelen = strlen(name)) == 0))
407 if ((usrtb == NULL) && (usrtb_start() < 0))
411 * look up in hash table, if found and valid return the uid,
412 * if found and invalid, return a -1
414 pptr = usrtb + st_hash(name, namelen, UNM_SZ);
417 if ((ptr != NULL) && (ptr->valid > 0) && !strcmp(name, ptr->name)) {
418 if (ptr->valid == INVALID)
425 if (_pwcache_setpassent != NULL)
426 (*_pwcache_setpassent)(1);
431 *pptr = ptr = (UIDC *)malloc(sizeof(UIDC));
434 * no match, look it up, if no match store it as an invalid entry,
435 * or store the matching uid
438 if ((pw = (*_pwcache_getpwnam)(name)) == NULL)
443 strlcpy(ptr->name, name, UNMLEN);
444 if ((pw = (*_pwcache_getpwnam)(name)) == NULL) {
445 ptr->valid = INVALID;
449 *uid = ptr->uid = pw->pw_uid;
455 * caches the gid for a given group name. We use a simple hash table.
457 * the gid (if any) for a group name, or a -1 if no match can be found
460 gid_from_group(const char *name, gid_t *gid)
467 * return -1 for mangled names
469 if (name == NULL || ((namelen = strlen(name)) == 0))
471 if ((grptb == NULL) && (grptb_start() < 0))
475 * look up in hash table, if found and valid return the uid,
476 * if found and invalid, return a -1
478 pptr = grptb + st_hash(name, namelen, GID_SZ);
481 if ((ptr != NULL) && (ptr->valid > 0) && !strcmp(name, ptr->name)) {
482 if (ptr->valid == INVALID)
489 if (_pwcache_setgroupent != NULL)
490 (*_pwcache_setgroupent)(1);
495 *pptr = ptr = (GIDC *)malloc(sizeof(GIDC));
498 * no match, look it up, if no match store it as an invalid entry,
499 * or store the matching gid
502 if ((gr = (*_pwcache_getgrnam)(name)) == NULL)
508 strlcpy(ptr->name, name, GNMLEN);
509 if ((gr = (*_pwcache_getgrnam)(name)) == NULL) {
510 ptr->valid = INVALID;
514 *gid = ptr->gid = gr->gr_gid;
518 #define FLUSHTB(arr, len, fail) \
521 for (i = 0; i < len; i++) \
522 if (arr[i] != NULL) \
527 } while (/* CONSTCOND */0);
531 int (*a_setpassent)(int),
532 void (*a_endpwent)(void),
533 struct passwd * (*a_getpwnam)(const char *),
534 struct passwd * (*a_getpwuid)(uid_t))
538 /* a_setpassent and a_endpwent may be NULL */
539 if (a_getpwnam == NULL || a_getpwuid == NULL)
542 if (_pwcache_endpwent != NULL)
543 (*_pwcache_endpwent)();
544 FLUSHTB(uidtb, UID_SZ, uidtb_fail);
545 FLUSHTB(usrtb, UNM_SZ, usrtb_fail);
547 _pwcache_setpassent = a_setpassent;
548 _pwcache_endpwent = a_endpwent;
549 _pwcache_getpwnam = a_getpwnam;
550 _pwcache_getpwuid = a_getpwuid;
557 int (*a_setgroupent)(int),
558 void (*a_endgrent)(void),
559 struct group * (*a_getgrnam)(const char *),
560 struct group * (*a_getgrgid)(gid_t))
564 /* a_setgroupent and a_endgrent may be NULL */
565 if (a_getgrnam == NULL || a_getgrgid == NULL)
568 if (_pwcache_endgrent != NULL)
569 (*_pwcache_endgrent)();
570 FLUSHTB(gidtb, GID_SZ, gidtb_fail);
571 FLUSHTB(grptb, GNM_SZ, grptb_fail);
573 _pwcache_setgroupent = a_setgroupent;
574 _pwcache_endgrent = a_endgrent;
575 _pwcache_getgrnam = a_getgrnam;
576 _pwcache_getgrgid = a_getgrgid;
585 test_getpwnam(const char *name)
587 static struct passwd foo;
589 memset(&foo, 0, sizeof(foo));
590 if (strcmp(name, "toor") == 0) {
594 return (getpwnam(name));
598 main(int argc, char *argv[])
603 printf("pass 1 (default userdb)\n");
604 for (i = 1; i < argc; i++) {
605 printf("i: %d, pwopn %d usrtb_fail %d usrtb %p\n",
606 i, pwopn, usrtb_fail, usrtb);
607 r = uid_from_user(argv[i], &u);
609 printf(" uid_from_user %s: failed\n", argv[i]);
611 printf(" uid_from_user %s: %d\n", argv[i], u);
613 printf("pass 1 finish: pwopn %d usrtb_fail %d usrtb %p\n",
614 pwopn, usrtb_fail, usrtb);
617 printf("pass 2 (replacement userdb)\n");
618 printf("pwcache_userdb returned %d\n",
619 pwcache_userdb(setpassent, test_getpwnam, getpwuid));
620 printf("pwopn %d usrtb_fail %d usrtb %p\n", pwopn, usrtb_fail, usrtb);
622 for (i = 1; i < argc; i++) {
623 printf("i: %d, pwopn %d usrtb_fail %d usrtb %p\n",
624 i, pwopn, usrtb_fail, usrtb);
626 r = uid_from_user(argv[i], &u);
628 printf(" uid_from_user %s: failed\n", argv[i]);
630 printf(" uid_from_user %s: %d\n", argv[i], u);
632 printf("pass 2 finish: pwopn %d usrtb_fail %d usrtb %p\n",
633 pwopn, usrtb_fail, usrtb);
636 printf("pass 3 (null pointers)\n");
637 printf("pwcache_userdb returned %d\n",
638 pwcache_userdb(NULL, NULL, NULL));
642 #endif /* TEST_PWCACHE */
643 #endif /* !HAVE_PWCACHE_USERDB */