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-rw-r--r--pwcache.c643
1 files changed, 643 insertions, 0 deletions
diff --git a/pwcache.c b/pwcache.c
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+++ b/pwcache.c
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+/* $NetBSD: pwcache.c,v 1.31 2010/03/23 20:28:59 drochner Exp $ */
+
+/*-
+ * Copyright (c) 1992 Keith Muller.
+ * Copyright (c) 1992, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Keith Muller of the University of California, San Diego.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*-
+ * Copyright (c) 2002 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#if HAVE_NBTOOL_CONFIG_H
+#include "nbtool_config.h"
+/*
+ * XXX Undefine the renames of these functions so that we don't
+ * XXX rename the versions found in the host's <pwd.h> by mistake!
+ */
+#undef group_from_gid
+#undef user_from_uid
+#endif
+
+#include <sys/cdefs.h>
+#if defined(LIBC_SCCS) && !defined(lint)
+#if 0
+static char sccsid[] = "@(#)cache.c 8.1 (Berkeley) 5/31/93";
+#else
+__RCSID("$NetBSD: pwcache.c,v 1.31 2010/03/23 20:28:59 drochner Exp $");
+#endif
+#endif /* LIBC_SCCS and not lint */
+
+#include "namespace.h"
+
+#include <sys/types.h>
+#include <sys/param.h>
+
+#include <assert.h>
+#include <grp.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#if HAVE_NBTOOL_CONFIG_H
+/* XXX Now, re-apply the renaming that we undid above. */
+#define group_from_gid __nbcompat_group_from_gid
+#define user_from_uid __nbcompat_user_from_uid
+#endif
+
+#ifdef __weak_alias
+__weak_alias(user_from_uid,_user_from_uid)
+__weak_alias(group_from_gid,_group_from_gid)
+__weak_alias(pwcache_groupdb,_pwcache_groupdb)
+#endif
+
+#if !HAVE_PWCACHE_USERDB || HAVE_NBTOOL_CONFIG_H
+#include "pwcache.h"
+
+/*
+ * routines that control user, group, uid and gid caches (for the archive
+ * member print routine).
+ * IMPORTANT:
+ * these routines cache BOTH hits and misses, a major performance improvement
+ */
+
+/*
+ * function pointers to various name lookup routines.
+ * these may be changed as necessary.
+ */
+static int (*_pwcache_setgroupent)(int) = setgroupent;
+static void (*_pwcache_endgrent)(void) = endgrent;
+static struct group * (*_pwcache_getgrnam)(const char *) = getgrnam;
+static struct group * (*_pwcache_getgrgid)(gid_t) = getgrgid;
+static int (*_pwcache_setpassent)(int) = setpassent;
+static void (*_pwcache_endpwent)(void) = endpwent;
+static struct passwd * (*_pwcache_getpwnam)(const char *) = getpwnam;
+static struct passwd * (*_pwcache_getpwuid)(uid_t) = getpwuid;
+
+/*
+ * internal state
+ */
+static int pwopn; /* is password file open */
+static int gropn; /* is group file open */
+static UIDC **uidtb; /* uid to name cache */
+static GIDC **gidtb; /* gid to name cache */
+static UIDC **usrtb; /* user name to uid cache */
+static GIDC **grptb; /* group name to gid cache */
+
+static int uidtb_fail; /* uidtb_start() failed ? */
+static int gidtb_fail; /* gidtb_start() failed ? */
+static int usrtb_fail; /* usrtb_start() failed ? */
+static int grptb_fail; /* grptb_start() failed ? */
+
+
+static u_int st_hash(const char *, size_t, int);
+static int uidtb_start(void);
+static int gidtb_start(void);
+static int usrtb_start(void);
+static int grptb_start(void);
+
+
+static u_int
+st_hash(const char *name, size_t len, int tabsz)
+{
+ u_int key = 0;
+
+ _DIAGASSERT(name != NULL);
+
+ while (len--) {
+ key += *name++;
+ key = (key << 8) | (key >> 24);
+ }
+
+ return (key % tabsz);
+}
+
+/*
+ * uidtb_start
+ * creates an an empty uidtb
+ * Return:
+ * 0 if ok, -1 otherwise
+ */
+static int
+uidtb_start(void)
+{
+
+ if (uidtb != NULL)
+ return (0);
+ if (uidtb_fail)
+ return (-1);
+ if ((uidtb = (UIDC **)calloc(UID_SZ, sizeof(UIDC *))) == NULL) {
+ ++uidtb_fail;
+ return (-1);
+ }
+ return (0);
+}
+
+/*
+ * gidtb_start
+ * creates an an empty gidtb
+ * Return:
+ * 0 if ok, -1 otherwise
+ */
+static int
+gidtb_start(void)
+{
+
+ if (gidtb != NULL)
+ return (0);
+ if (gidtb_fail)
+ return (-1);
+ if ((gidtb = (GIDC **)calloc(GID_SZ, sizeof(GIDC *))) == NULL) {
+ ++gidtb_fail;
+ return (-1);
+ }
+ return (0);
+}
+
+/*
+ * usrtb_start
+ * creates an an empty usrtb
+ * Return:
+ * 0 if ok, -1 otherwise
+ */
+static int
+usrtb_start(void)
+{
+
+ if (usrtb != NULL)
+ return (0);
+ if (usrtb_fail)
+ return (-1);
+ if ((usrtb = (UIDC **)calloc(UNM_SZ, sizeof(UIDC *))) == NULL) {
+ ++usrtb_fail;
+ return (-1);
+ }
+ return (0);
+}
+
+/*
+ * grptb_start
+ * creates an an empty grptb
+ * Return:
+ * 0 if ok, -1 otherwise
+ */
+static int
+grptb_start(void)
+{
+
+ if (grptb != NULL)
+ return (0);
+ if (grptb_fail)
+ return (-1);
+ if ((grptb = (GIDC **)calloc(GNM_SZ, sizeof(GIDC *))) == NULL) {
+ ++grptb_fail;
+ return (-1);
+ }
+ return (0);
+}
+
+/*
+ * user_from_uid()
+ * caches the name (if any) for the uid. If noname clear, we always
+ * return the stored name (if valid or invalid match).
+ * We use a simple hash table.
+ * Return
+ * Pointer to stored name (or a empty string)
+ */
+const char *
+user_from_uid(uid_t uid, int noname)
+{
+ struct passwd *pw;
+ UIDC *ptr, **pptr;
+
+ if ((uidtb == NULL) && (uidtb_start() < 0))
+ return (NULL);
+
+ /*
+ * see if we have this uid cached
+ */
+ pptr = uidtb + (uid % UID_SZ);
+ ptr = *pptr;
+
+ if ((ptr != NULL) && (ptr->valid > 0) && (ptr->uid == uid)) {
+ /*
+ * have an entry for this uid
+ */
+ if (!noname || (ptr->valid == VALID))
+ return (ptr->name);
+ return (NULL);
+ }
+
+ /*
+ * No entry for this uid, we will add it
+ */
+ if (!pwopn) {
+ if (_pwcache_setpassent != NULL)
+ (*_pwcache_setpassent)(1);
+ ++pwopn;
+ }
+
+ if (ptr == NULL)
+ *pptr = ptr = (UIDC *)malloc(sizeof(UIDC));
+
+ if ((pw = (*_pwcache_getpwuid)(uid)) == NULL) {
+ /*
+ * no match for this uid in the local password file
+ * a string that is the uid in numeric format
+ */
+ if (ptr == NULL)
+ return (NULL);
+ ptr->uid = uid;
+ (void)snprintf(ptr->name, UNMLEN, "%lu", (long) uid);
+ ptr->valid = INVALID;
+ if (noname)
+ return (NULL);
+ } else {
+ /*
+ * there is an entry for this uid in the password file
+ */
+ if (ptr == NULL)
+ return (pw->pw_name);
+ ptr->uid = uid;
+ (void)strlcpy(ptr->name, pw->pw_name, UNMLEN);
+ ptr->valid = VALID;
+ }
+ return (ptr->name);
+}
+
+/*
+ * group_from_gid()
+ * caches the name (if any) for the gid. If noname clear, we always
+ * return the stored name (if valid or invalid match).
+ * We use a simple hash table.
+ * Return
+ * Pointer to stored name (or a empty string)
+ */
+const char *
+group_from_gid(gid_t gid, int noname)
+{
+ struct group *gr;
+ GIDC *ptr, **pptr;
+
+ if ((gidtb == NULL) && (gidtb_start() < 0))
+ return (NULL);
+
+ /*
+ * see if we have this gid cached
+ */
+ pptr = gidtb + (gid % GID_SZ);
+ ptr = *pptr;
+
+ if ((ptr != NULL) && (ptr->valid > 0) && (ptr->gid == gid)) {
+ /*
+ * have an entry for this gid
+ */
+ if (!noname || (ptr->valid == VALID))
+ return (ptr->name);
+ return (NULL);
+ }
+
+ /*
+ * No entry for this gid, we will add it
+ */
+ if (!gropn) {
+ if (_pwcache_setgroupent != NULL)
+ (*_pwcache_setgroupent)(1);
+ ++gropn;
+ }
+
+ if (ptr == NULL)
+ *pptr = ptr = (GIDC *)malloc(sizeof(GIDC));
+
+ if ((gr = (*_pwcache_getgrgid)(gid)) == NULL) {
+ /*
+ * no match for this gid in the local group file, put in
+ * a string that is the gid in numberic format
+ */
+ if (ptr == NULL)
+ return (NULL);
+ ptr->gid = gid;
+ (void)snprintf(ptr->name, GNMLEN, "%lu", (long) gid);
+ ptr->valid = INVALID;
+ if (noname)
+ return (NULL);
+ } else {
+ /*
+ * there is an entry for this group in the group file
+ */
+ if (ptr == NULL)
+ return (gr->gr_name);
+ ptr->gid = gid;
+ (void)strlcpy(ptr->name, gr->gr_name, GNMLEN);
+ ptr->valid = VALID;
+ }
+ return (ptr->name);
+}
+
+/*
+ * uid_from_user()
+ * caches the uid for a given user name. We use a simple hash table.
+ * Return
+ * the uid (if any) for a user name, or a -1 if no match can be found
+ */
+int
+uid_from_user(const char *name, uid_t *uid)
+{
+ struct passwd *pw;
+ UIDC *ptr, **pptr;
+ size_t namelen;
+
+ /*
+ * return -1 for mangled names
+ */
+ if (name == NULL || ((namelen = strlen(name)) == 0))
+ return (-1);
+ if ((usrtb == NULL) && (usrtb_start() < 0))
+ return (-1);
+
+ /*
+ * look up in hash table, if found and valid return the uid,
+ * if found and invalid, return a -1
+ */
+ pptr = usrtb + st_hash(name, namelen, UNM_SZ);
+ ptr = *pptr;
+
+ if ((ptr != NULL) && (ptr->valid > 0) && !strcmp(name, ptr->name)) {
+ if (ptr->valid == INVALID)
+ return (-1);
+ *uid = ptr->uid;
+ return (0);
+ }
+
+ if (!pwopn) {
+ if (_pwcache_setpassent != NULL)
+ (*_pwcache_setpassent)(1);
+ ++pwopn;
+ }
+
+ if (ptr == NULL)
+ *pptr = ptr = (UIDC *)malloc(sizeof(UIDC));
+
+ /*
+ * no match, look it up, if no match store it as an invalid entry,
+ * or store the matching uid
+ */
+ if (ptr == NULL) {
+ if ((pw = (*_pwcache_getpwnam)(name)) == NULL)
+ return (-1);
+ *uid = pw->pw_uid;
+ return (0);
+ }
+ (void)strlcpy(ptr->name, name, UNMLEN);
+ if ((pw = (*_pwcache_getpwnam)(name)) == NULL) {
+ ptr->valid = INVALID;
+ return (-1);
+ }
+ ptr->valid = VALID;
+ *uid = ptr->uid = pw->pw_uid;
+ return (0);
+}
+
+/*
+ * gid_from_group()
+ * caches the gid for a given group name. We use a simple hash table.
+ * Return
+ * the gid (if any) for a group name, or a -1 if no match can be found
+ */
+int
+gid_from_group(const char *name, gid_t *gid)
+{
+ struct group *gr;
+ GIDC *ptr, **pptr;
+ size_t namelen;
+
+ /*
+ * return -1 for mangled names
+ */
+ if (name == NULL || ((namelen = strlen(name)) == 0))
+ return (-1);
+ if ((grptb == NULL) && (grptb_start() < 0))
+ return (-1);
+
+ /*
+ * look up in hash table, if found and valid return the uid,
+ * if found and invalid, return a -1
+ */
+ pptr = grptb + st_hash(name, namelen, GID_SZ);
+ ptr = *pptr;
+
+ if ((ptr != NULL) && (ptr->valid > 0) && !strcmp(name, ptr->name)) {
+ if (ptr->valid == INVALID)
+ return (-1);
+ *gid = ptr->gid;
+ return (0);
+ }
+
+ if (!gropn) {
+ if (_pwcache_setgroupent != NULL)
+ (*_pwcache_setgroupent)(1);
+ ++gropn;
+ }
+
+ if (ptr == NULL)
+ *pptr = ptr = (GIDC *)malloc(sizeof(GIDC));
+
+ /*
+ * no match, look it up, if no match store it as an invalid entry,
+ * or store the matching gid
+ */
+ if (ptr == NULL) {
+ if ((gr = (*_pwcache_getgrnam)(name)) == NULL)
+ return (-1);
+ *gid = gr->gr_gid;
+ return (0);
+ }
+
+ (void)strlcpy(ptr->name, name, GNMLEN);
+ if ((gr = (*_pwcache_getgrnam)(name)) == NULL) {
+ ptr->valid = INVALID;
+ return (-1);
+ }
+ ptr->valid = VALID;
+ *gid = ptr->gid = gr->gr_gid;
+ return (0);
+}
+
+#define FLUSHTB(arr, len, fail) \
+ do { \
+ if (arr != NULL) { \
+ for (i = 0; i < len; i++) \
+ if (arr[i] != NULL) \
+ free(arr[i]); \
+ arr = NULL; \
+ } \
+ fail = 0; \
+ } while (/* CONSTCOND */0);
+
+int
+pwcache_userdb(
+ int (*a_setpassent)(int),
+ void (*a_endpwent)(void),
+ struct passwd * (*a_getpwnam)(const char *),
+ struct passwd * (*a_getpwuid)(uid_t))
+{
+ int i;
+
+ /* a_setpassent and a_endpwent may be NULL */
+ if (a_getpwnam == NULL || a_getpwuid == NULL)
+ return (-1);
+
+ if (_pwcache_endpwent != NULL)
+ (*_pwcache_endpwent)();
+ FLUSHTB(uidtb, UID_SZ, uidtb_fail);
+ FLUSHTB(usrtb, UNM_SZ, usrtb_fail);
+ pwopn = 0;
+ _pwcache_setpassent = a_setpassent;
+ _pwcache_endpwent = a_endpwent;
+ _pwcache_getpwnam = a_getpwnam;
+ _pwcache_getpwuid = a_getpwuid;
+
+ return (0);
+}
+
+int
+pwcache_groupdb(
+ int (*a_setgroupent)(int),
+ void (*a_endgrent)(void),
+ struct group * (*a_getgrnam)(const char *),
+ struct group * (*a_getgrgid)(gid_t))
+{
+ int i;
+
+ /* a_setgroupent and a_endgrent may be NULL */
+ if (a_getgrnam == NULL || a_getgrgid == NULL)
+ return (-1);
+
+ if (_pwcache_endgrent != NULL)
+ (*_pwcache_endgrent)();
+ FLUSHTB(gidtb, GID_SZ, gidtb_fail);
+ FLUSHTB(grptb, GNM_SZ, grptb_fail);
+ gropn = 0;
+ _pwcache_setgroupent = a_setgroupent;
+ _pwcache_endgrent = a_endgrent;
+ _pwcache_getgrnam = a_getgrnam;
+ _pwcache_getgrgid = a_getgrgid;
+
+ return (0);
+}
+
+
+#ifdef TEST_PWCACHE
+
+struct passwd *
+test_getpwnam(const char *name)
+{
+ static struct passwd foo;
+
+ memset(&foo, 0, sizeof(foo));
+ if (strcmp(name, "toor") == 0) {
+ foo.pw_uid = 666;
+ return &foo;
+ }
+ return (getpwnam(name));
+}
+
+int
+main(int argc, char *argv[])
+{
+ uid_t u;
+ int r, i;
+
+ printf("pass 1 (default userdb)\n");
+ for (i = 1; i < argc; i++) {
+ printf("i: %d, pwopn %d usrtb_fail %d usrtb %p\n",
+ i, pwopn, usrtb_fail, usrtb);
+ r = uid_from_user(argv[i], &u);
+ if (r == -1)
+ printf(" uid_from_user %s: failed\n", argv[i]);
+ else
+ printf(" uid_from_user %s: %d\n", argv[i], u);
+ }
+ printf("pass 1 finish: pwopn %d usrtb_fail %d usrtb %p\n",
+ pwopn, usrtb_fail, usrtb);
+
+ puts("");
+ printf("pass 2 (replacement userdb)\n");
+ printf("pwcache_userdb returned %d\n",
+ pwcache_userdb(setpassent, test_getpwnam, getpwuid));
+ printf("pwopn %d usrtb_fail %d usrtb %p\n", pwopn, usrtb_fail, usrtb);
+
+ for (i = 1; i < argc; i++) {
+ printf("i: %d, pwopn %d usrtb_fail %d usrtb %p\n",
+ i, pwopn, usrtb_fail, usrtb);
+ u = -1;
+ r = uid_from_user(argv[i], &u);
+ if (r == -1)
+ printf(" uid_from_user %s: failed\n", argv[i]);
+ else
+ printf(" uid_from_user %s: %d\n", argv[i], u);
+ }
+ printf("pass 2 finish: pwopn %d usrtb_fail %d usrtb %p\n",
+ pwopn, usrtb_fail, usrtb);
+
+ puts("");
+ printf("pass 3 (null pointers)\n");
+ printf("pwcache_userdb returned %d\n",
+ pwcache_userdb(NULL, NULL, NULL));
+
+ return (0);
+}
+#endif /* TEST_PWCACHE */
+#endif /* !HAVE_PWCACHE_USERDB */