355 lines
9.3 KiB
C
355 lines
9.3 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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#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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#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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#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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#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),
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void (*a_endpwent)(void),
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struct passwd * (*a_getpwnam)(const char *),
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struct passwd * (*a_getpwuid)(uid_t))
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{
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int i;
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/* a_setpassent and a_endpwent may be NULL */
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if (a_getpwnam == NULL || a_getpwuid == NULL)
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return (-1);
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if (_pwcache_endpwent != NULL)
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(*_pwcache_endpwent)();
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FLUSHTB(uidtb, UID_SZ, uidtb_fail);
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FLUSHTB(usrtb, UNM_SZ, usrtb_fail);
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pwopn = 0;
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_pwcache_setpassent = a_setpassent;
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_pwcache_endpwent = a_endpwent;
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_pwcache_getpwnam = a_getpwnam;
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_pwcache_getpwuid = a_getpwuid;
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return (0);
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}
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int
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pwcache_groupdb(
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int (*a_setgroupent)(int),
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void (*a_endgrent)(void),
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struct group * (*a_getgrnam)(const char *),
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struct group * (*a_getgrgid)(gid_t))
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{
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int i;
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/* a_setgroupent and a_endgrent may be NULL */
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if (a_getgrnam == NULL || a_getgrgid == NULL)
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return (-1);
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if (_pwcache_endgrent != NULL)
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(*_pwcache_endgrent)();
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FLUSHTB(gidtb, GID_SZ, gidtb_fail);
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FLUSHTB(grptb, GNM_SZ, grptb_fail);
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gropn = 0;
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_pwcache_setgroupent = a_setgroupent;
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_pwcache_endgrent = a_endgrent;
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_pwcache_getgrnam = a_getgrnam;
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_pwcache_getgrgid = a_getgrgid;
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return (0);
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}
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#ifdef TEST_PWCACHE
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struct passwd *
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test_getpwnam(const char *name)
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{
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static struct passwd foo;
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memset(&foo, 0, sizeof(foo));
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if (strcmp(name, "toor") == 0) {
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foo.pw_uid = 666;
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return &foo;
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}
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return (getpwnam(name));
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}
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int
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main(int argc, char *argv[])
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{
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uid_t u;
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int r, i;
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printf("pass 1 (default userdb)\n");
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for (i = 1; i < argc; i++) {
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printf("i: %d, pwopn %d usrtb_fail %d usrtb %p\n",
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i, pwopn, usrtb_fail, usrtb);
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r = uid_from_user(argv[i], &u);
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if (r == -1)
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printf(" uid_from_user %s: failed\n", argv[i]);
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else
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printf(" uid_from_user %s: %d\n", argv[i], u);
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}
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printf("pass 1 finish: pwopn %d usrtb_fail %d usrtb %p\n",
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pwopn, usrtb_fail, usrtb);
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puts("");
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printf("pass 2 (replacement userdb)\n");
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printf("pwcache_userdb returned %d\n",
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pwcache_userdb(setpassent, test_getpwnam, getpwuid));
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printf("pwopn %d usrtb_fail %d usrtb %p\n", pwopn, usrtb_fail, usrtb);
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for (i = 1; i < argc; i++) {
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printf("i: %d, pwopn %d usrtb_fail %d usrtb %p\n",
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i, pwopn, usrtb_fail, usrtb);
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u = -1;
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r = uid_from_user(argv[i], &u);
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if (r == -1)
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printf(" uid_from_user %s: failed\n", argv[i]);
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else
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printf(" uid_from_user %s: %d\n", argv[i], u);
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}
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printf("pass 2 finish: pwopn %d usrtb_fail %d usrtb %p\n",
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pwopn, usrtb_fail, usrtb);
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puts("");
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printf("pass 3 (null pointers)\n");
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printf("pwcache_userdb returned %d\n",
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pwcache_userdb(NULL, NULL, NULL));
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return (0);
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}
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#endif /* TEST_PWCACHE */
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#endif /* !HAVE_PWCACHE_USERDB */
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