cb3047054f
This adds two features: * uid_from_user() and gid_from_group() as the reverse of user_from_uid() and groups_from_gid(). * pwcache_userdb() and pwcache_groupdb() which allow alternative lookup functions to be used. For example lookups from passwd and group databases in a non-standard location.
647 lines
16 KiB
C
647 lines
16 KiB
C
/* $NetBSD: pwcache.c,v 1.31 2010/03/23 20:28:59 drochner Exp $ */
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/*-
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* Copyright (c) 1992 Keith Muller.
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Keith Muller of the University of California, San Diego.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*-
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* Copyright (c) 2002 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#if HAVE_NBTOOL_CONFIG_H
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#include "nbtool_config.h"
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/*
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* XXX Undefine the renames of these functions so that we don't
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* XXX rename the versions found in the host's <pwd.h> by mistake!
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*/
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#undef group_from_gid
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#undef user_from_uid
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#endif
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)cache.c 8.1 (Berkeley) 5/31/93";
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#else
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__RCSID("$NetBSD: pwcache.c,v 1.31 2010/03/23 20:28:59 drochner Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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__FBSDID("$FreeBSD$");
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#include "namespace.h"
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#include <sys/types.h>
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#include <sys/param.h>
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#include <assert.h>
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#include <grp.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#define _DIAGASSERT(x) assert((x))
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#if HAVE_NBTOOL_CONFIG_H
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/* XXX Now, re-apply the renaming that we undid above. */
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#define group_from_gid __nbcompat_group_from_gid
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#define user_from_uid __nbcompat_user_from_uid
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#endif
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#ifdef __weak_alias
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__weak_alias(user_from_uid,_user_from_uid)
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__weak_alias(group_from_gid,_group_from_gid)
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__weak_alias(pwcache_groupdb,_pwcache_groupdb)
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#endif
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#if !HAVE_PWCACHE_USERDB || HAVE_NBTOOL_CONFIG_H
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#include "pwcache.h"
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/*
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* routines that control user, group, uid and gid caches (for the archive
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* member print routine).
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* IMPORTANT:
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* these routines cache BOTH hits and misses, a major performance improvement
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*/
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/*
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* function pointers to various name lookup routines.
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* these may be changed as necessary.
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*/
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static int (*_pwcache_setgroupent)(int) = setgroupent;
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static void (*_pwcache_endgrent)(void) = endgrent;
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static struct group * (*_pwcache_getgrnam)(const char *) = getgrnam;
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static struct group * (*_pwcache_getgrgid)(gid_t) = getgrgid;
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static int (*_pwcache_setpassent)(int) = setpassent;
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static void (*_pwcache_endpwent)(void) = endpwent;
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static struct passwd * (*_pwcache_getpwnam)(const char *) = getpwnam;
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static struct passwd * (*_pwcache_getpwuid)(uid_t) = getpwuid;
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/*
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* internal state
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*/
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static int pwopn; /* is password file open */
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static int gropn; /* is group file open */
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static UIDC **uidtb; /* uid to name cache */
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static GIDC **gidtb; /* gid to name cache */
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static UIDC **usrtb; /* user name to uid cache */
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static GIDC **grptb; /* group name to gid cache */
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static int uidtb_fail; /* uidtb_start() failed ? */
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static int gidtb_fail; /* gidtb_start() failed ? */
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static int usrtb_fail; /* usrtb_start() failed ? */
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static int grptb_fail; /* grptb_start() failed ? */
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static u_int st_hash(const char *, size_t, int);
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static int uidtb_start(void);
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static int gidtb_start(void);
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static int usrtb_start(void);
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static int grptb_start(void);
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static u_int
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st_hash(const char *name, size_t len, int tabsz)
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{
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u_int key = 0;
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_DIAGASSERT(name != NULL);
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while (len--) {
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key += *name++;
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key = (key << 8) | (key >> 24);
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}
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return (key % tabsz);
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}
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/*
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* uidtb_start
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* creates an an empty uidtb
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* Return:
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* 0 if ok, -1 otherwise
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*/
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static int
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uidtb_start(void)
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{
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if (uidtb != NULL)
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return (0);
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if (uidtb_fail)
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return (-1);
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if ((uidtb = (UIDC **)calloc(UID_SZ, sizeof(UIDC *))) == NULL) {
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++uidtb_fail;
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return (-1);
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}
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return (0);
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}
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/*
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* gidtb_start
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* creates an an empty gidtb
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* Return:
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* 0 if ok, -1 otherwise
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*/
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static int
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gidtb_start(void)
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{
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if (gidtb != NULL)
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return (0);
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if (gidtb_fail)
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return (-1);
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if ((gidtb = (GIDC **)calloc(GID_SZ, sizeof(GIDC *))) == NULL) {
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++gidtb_fail;
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return (-1);
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}
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return (0);
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}
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/*
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* usrtb_start
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* creates an an empty usrtb
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* Return:
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* 0 if ok, -1 otherwise
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*/
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static int
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usrtb_start(void)
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{
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if (usrtb != NULL)
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return (0);
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if (usrtb_fail)
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return (-1);
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if ((usrtb = (UIDC **)calloc(UNM_SZ, sizeof(UIDC *))) == NULL) {
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++usrtb_fail;
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return (-1);
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}
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return (0);
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}
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/*
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* grptb_start
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* creates an an empty grptb
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* Return:
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* 0 if ok, -1 otherwise
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*/
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static int
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grptb_start(void)
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{
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if (grptb != NULL)
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return (0);
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if (grptb_fail)
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return (-1);
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if ((grptb = (GIDC **)calloc(GNM_SZ, sizeof(GIDC *))) == NULL) {
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++grptb_fail;
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return (-1);
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}
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return (0);
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}
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/*
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* user_from_uid()
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* caches the name (if any) for the uid. If noname clear, we always
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* return the stored name (if valid or invalid match).
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* We use a simple hash table.
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* Return
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* Pointer to stored name (or a empty string)
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*/
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const char *
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user_from_uid(uid_t uid, int noname)
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{
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struct passwd *pw;
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UIDC *ptr, **pptr;
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if ((uidtb == NULL) && (uidtb_start() < 0))
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return (NULL);
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/*
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* see if we have this uid cached
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*/
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pptr = uidtb + (uid % UID_SZ);
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ptr = *pptr;
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if ((ptr != NULL) && (ptr->valid > 0) && (ptr->uid == uid)) {
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/*
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* have an entry for this uid
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*/
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if (!noname || (ptr->valid == VALID))
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return (ptr->name);
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return (NULL);
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}
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/*
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* No entry for this uid, we will add it
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*/
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if (!pwopn) {
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if (_pwcache_setpassent != NULL)
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(*_pwcache_setpassent)(1);
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++pwopn;
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}
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if (ptr == NULL)
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*pptr = ptr = (UIDC *)malloc(sizeof(UIDC));
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if ((pw = (*_pwcache_getpwuid)(uid)) == NULL) {
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/*
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* no match for this uid in the local password file
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* a string that is the uid in numeric format
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*/
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if (ptr == NULL)
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return (NULL);
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ptr->uid = uid;
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(void)snprintf(ptr->name, UNMLEN, "%lu", (long) uid);
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ptr->valid = INVALID;
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if (noname)
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return (NULL);
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} else {
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/*
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* there is an entry for this uid in the password file
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*/
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if (ptr == NULL)
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return (pw->pw_name);
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ptr->uid = uid;
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(void)strlcpy(ptr->name, pw->pw_name, UNMLEN);
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ptr->valid = VALID;
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}
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return (ptr->name);
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}
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/*
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* group_from_gid()
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* caches the name (if any) for the gid. If noname clear, we always
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* return the stored name (if valid or invalid match).
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* We use a simple hash table.
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* Return
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* Pointer to stored name (or a empty string)
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*/
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const char *
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group_from_gid(gid_t gid, int noname)
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{
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struct group *gr;
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GIDC *ptr, **pptr;
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if ((gidtb == NULL) && (gidtb_start() < 0))
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return (NULL);
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/*
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* see if we have this gid cached
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*/
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pptr = gidtb + (gid % GID_SZ);
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ptr = *pptr;
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if ((ptr != NULL) && (ptr->valid > 0) && (ptr->gid == gid)) {
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/*
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* have an entry for this gid
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*/
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if (!noname || (ptr->valid == VALID))
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return (ptr->name);
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return (NULL);
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}
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/*
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* No entry for this gid, we will add it
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*/
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if (!gropn) {
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if (_pwcache_setgroupent != NULL)
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(*_pwcache_setgroupent)(1);
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++gropn;
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}
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if (ptr == NULL)
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*pptr = ptr = (GIDC *)malloc(sizeof(GIDC));
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if ((gr = (*_pwcache_getgrgid)(gid)) == NULL) {
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/*
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* no match for this gid in the local group file, put in
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* a string that is the gid in numberic format
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*/
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if (ptr == NULL)
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return (NULL);
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ptr->gid = gid;
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(void)snprintf(ptr->name, GNMLEN, "%lu", (long) gid);
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ptr->valid = INVALID;
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if (noname)
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return (NULL);
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} else {
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/*
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* there is an entry for this group in the group file
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*/
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if (ptr == NULL)
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return (gr->gr_name);
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ptr->gid = gid;
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(void)strlcpy(ptr->name, gr->gr_name, GNMLEN);
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ptr->valid = VALID;
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}
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return (ptr->name);
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}
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/*
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* uid_from_user()
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* caches the uid for a given user name. We use a simple hash table.
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* Return
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* the uid (if any) for a user name, or a -1 if no match can be found
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*/
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int
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uid_from_user(const char *name, uid_t *uid)
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{
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struct passwd *pw;
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UIDC *ptr, **pptr;
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size_t namelen;
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/*
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* return -1 for mangled names
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*/
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if (name == NULL || ((namelen = strlen(name)) == 0))
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return (-1);
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if ((usrtb == NULL) && (usrtb_start() < 0))
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return (-1);
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/*
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* look up in hash table, if found and valid return the uid,
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* if found and invalid, return a -1
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*/
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pptr = usrtb + st_hash(name, namelen, UNM_SZ);
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ptr = *pptr;
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if ((ptr != NULL) && (ptr->valid > 0) && !strcmp(name, ptr->name)) {
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if (ptr->valid == INVALID)
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return (-1);
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*uid = ptr->uid;
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return (0);
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}
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if (!pwopn) {
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if (_pwcache_setpassent != NULL)
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(*_pwcache_setpassent)(1);
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++pwopn;
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}
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if (ptr == NULL)
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*pptr = ptr = (UIDC *)malloc(sizeof(UIDC));
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/*
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* no match, look it up, if no match store it as an invalid entry,
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* or store the matching uid
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*/
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if (ptr == NULL) {
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if ((pw = (*_pwcache_getpwnam)(name)) == NULL)
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return (-1);
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*uid = pw->pw_uid;
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return (0);
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}
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(void)strlcpy(ptr->name, name, UNMLEN);
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if ((pw = (*_pwcache_getpwnam)(name)) == NULL) {
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ptr->valid = INVALID;
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return (-1);
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}
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ptr->valid = VALID;
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*uid = ptr->uid = pw->pw_uid;
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return (0);
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}
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/*
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* gid_from_group()
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* caches the gid for a given group name. We use a simple hash table.
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* Return
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* the gid (if any) for a group name, or a -1 if no match can be found
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*/
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int
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gid_from_group(const char *name, gid_t *gid)
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{
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struct group *gr;
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GIDC *ptr, **pptr;
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size_t namelen;
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/*
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* return -1 for mangled names
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*/
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if (name == NULL || ((namelen = strlen(name)) == 0))
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return (-1);
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if ((grptb == NULL) && (grptb_start() < 0))
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return (-1);
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/*
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* look up in hash table, if found and valid return the uid,
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* if found and invalid, return a -1
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*/
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pptr = grptb + st_hash(name, namelen, GID_SZ);
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ptr = *pptr;
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if ((ptr != NULL) && (ptr->valid > 0) && !strcmp(name, ptr->name)) {
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if (ptr->valid == INVALID)
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return (-1);
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*gid = ptr->gid;
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return (0);
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}
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if (!gropn) {
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if (_pwcache_setgroupent != NULL)
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(*_pwcache_setgroupent)(1);
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++gropn;
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}
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if (ptr == NULL)
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*pptr = ptr = (GIDC *)malloc(sizeof(GIDC));
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/*
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* no match, look it up, if no match store it as an invalid entry,
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* or store the matching gid
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*/
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if (ptr == NULL) {
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if ((gr = (*_pwcache_getgrnam)(name)) == NULL)
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return (-1);
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*gid = gr->gr_gid;
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return (0);
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}
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(void)strlcpy(ptr->name, name, GNMLEN);
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if ((gr = (*_pwcache_getgrnam)(name)) == NULL) {
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ptr->valid = INVALID;
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return (-1);
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}
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ptr->valid = VALID;
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*gid = ptr->gid = gr->gr_gid;
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return (0);
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}
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#define FLUSHTB(arr, len, fail) \
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do { \
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if (arr != NULL) { \
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for (i = 0; i < len; i++) \
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if (arr[i] != NULL) \
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free(arr[i]); \
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arr = NULL; \
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} \
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fail = 0; \
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} while (/* CONSTCOND */0);
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int
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pwcache_userdb(
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|
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 */
|