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426 lines (362 loc) · 7.93 KB
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/*-
* SPDX-License-Identifier: BSD-3-Clause
* Copyright (c) 1987, 1988, 1989, 1993, 1994, 1995
* The Regents of the University of California. All rights reserved.
* Copyright (c) 2002 The NetBSD Foundation, Inc.
* All rights reserved.
* This code is derived from software contributed to
* The NetBSD Foundation by Luke Mewburn of Wasabi Systems.
*/
/* from pkgsrc: getid.c,v 1.4 2008/11/06 02:14:52 jschauma Exp */
/* from NetBSD: getid.c,v 1.10 2014/10/27 21:46:45 christos Exp */
/* from NetBSD: getpwent.c,v 1.48 2000/10/03 03:22:26 enami Exp */
/* from NetBSD: getgrent.c,v 1.41 2002/01/12 23:51:30 lukem Exp */
#if HAVE_CONFIG_H
#include "config.h"
#endif
#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif
#if HAVE_NBCOMPAT_H
#include <nbcompat.h>
#endif
#if HAVE_SYS_CDEFS_H
#include <sys/cdefs.h>
#endif
#if defined(__RCSID) && !defined(lint)
__RCSID("$NetBSD: getid.c,v 1.10 2014/10/27 21:46:45 christos Exp $");
#endif
#if HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#if HAVE_GRP_H
#include <grp.h>
#endif
#if HAVE_LIMITS_H
#include <limits.h>
#endif
#if HAVE_PWD_H
#include <pwd.h>
#endif
#if HAVE_STDIO_H
#include <stdio.h>
#endif
#if HAVE_STDLIB_H
#include <stdlib.h>
#endif
#if HAVE_STRINGH_H
#include <stringh.h>
#endif
#if HAVE_TIME_H
#include <time.h>
#endif
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "extern.h"
static struct group * gi_getgrnam(const char *);
static struct group * gi_getgrgid(gid_t);
static int gi_setgroupent(int);
static void gi_endgrent(void);
static int grstart(void);
static int grscan(int, gid_t, const char *);
static int grmatchline(int, gid_t, const char *);
static struct passwd * gi_getpwnam(const char *);
static struct passwd * gi_getpwuid(uid_t);
static int gi_setpassent(int);
static void gi_endpwent(void);
static int pwstart(void);
static int pwscan(int, uid_t, const char *);
static int pwmatchline(int, uid_t, const char *);
#define MAXGRP 200
#define MAXLINELENGTH 1024
static FILE *_gr_fp;
static struct group _gr_group;
static int _gr_stayopen;
static int _gr_filesdone;
static FILE *_pw_fp;
static struct passwd _pw_passwd; /* password structure */
static int _pw_stayopen; /* keep fd's open */
static int _pw_filesdone;
static char grfile[MAXPATHLEN];
static char pwfile[MAXPATHLEN];
static char *members[MAXGRP];
static char grline[MAXLINELENGTH];
static char pwline[MAXLINEL
10BC8
ENGTH];
int
setup_getid(const char *dir)
{
if (dir == NULL)
return (0);
/* close existing databases */
gi_endgrent();
gi_endpwent();
/* build paths to new databases */
snprintf(grfile, sizeof(grfile), "%s/group", dir);
snprintf(pwfile, sizeof(pwfile), "%s/master.passwd", dir);
/* try to open new databases */
if (!grstart() || !pwstart())
return (0);
/* switch pwcache(3) lookup functions */
if (pwcache_groupdb(gi_setgroupent, gi_endgrent,
gi_getgrnam, gi_getgrgid) == -1
|| pwcache_userdb(gi_setpassent, gi_endpwent,
gi_getpwnam, gi_getpwuid) == -1)
return (0);
return (1);
}
/*
* group lookup functions
*/
static struct group *
gi_getgrnam(const char *name)
{
int rval;
if (!grstart())
return NULL;
rval = grscan(1, 0, name);
if (!_gr_stayopen)
endgrent();
return (rval) ? &_gr_group : NULL;
}
static struct group *
gi_getgrgid(gid_t gid)
{
int rval;
if (!grstart())
return NULL;
rval = grscan(1, gid, NULL);
if (!_gr_stayopen)
endgrent();
return (rval) ? &_gr_group : NULL;
}
static int
gi_setgroupent(int stayopen)
{
if (!grstart())
return 0;
_gr_stayopen = stayopen;
return 1;
}
static void
gi_endgrent(void)
{
_gr_filesdone = 0;
if (_gr_fp) {
(void)fclose(_gr_fp);
_gr_fp = NULL;
}
}
static int
grstart(void)
{
_gr_filesdone = 0;
if (_gr_fp) {
rewind(_gr_fp);
return 1;
}
if (grfile[0] == '\0') /* sanity check */
return 0;
_gr_fp = fopen(grfile, "r");
if (_gr_fp != NULL)
return 1;
warn("Can't open `%s'", grfile);
return 0;
}
static int
grscan(int search, gid_t gid, const char *name)
{
if (_gr_filesdone)
return 0;
for (;;) {
if (!fgets(grline, sizeof(grline), _gr_fp)) {
if (!search)
_gr_filesdone = 1;
return 0;
}
/* skip lines that are too big */
if (!strchr(grline, '\n')) {
int ch;
while ((ch = getc(_gr_fp)) != '\n' && ch != EOF)
;
continue;
}
/* skip comments */
if (grline[0] == '#')
continue;
if (grmatchline(search, gid, name))
return 1;
}
/* NOTREACHED */
}
static int
grmatchline(int search, gid_t gid, const char *name)
{
unsigned long id;
char **m;
char *cp, *bp, *ep;
/* name may be NULL if search is nonzero */
bp = grline;
memset(&_gr_group, 0, sizeof(_gr_group));
_gr_group.gr_name = strsep(&bp, ":\n");
if (search && name && strcmp(_gr_group.gr_name, name))
return 0;
_gr_group.gr_passwd = strsep(&bp, ":\n");
if (!(cp = strsep(&bp, ":\n")))
return 0;
id = strtoul(cp, &ep, 10);
if (id > GID_MAX || *ep != '\0')
return 0;
_gr_group.gr_gid = (gid_t)id;
if (search && name == NULL && _gr_group.gr_gid != gid)
return 0;
cp = NULL;
if (bp == NULL)
return 0;
for (_gr_group.gr_mem = m = members;; bp++) {
if (m == &members[MAXGRP - 1])
break;
if (*bp == ',') {
if (cp) {
*bp = '\0';
*m++ = cp;
cp = NULL;
}
} else if (*bp == '\0' || *bp == '\n' || *bp == ' ') {
if (cp) {
*bp = '\0';
*m++ = cp;
}
break;
} else if (cp == NULL)
cp = bp;
}
*m = NULL;
return 1;
}
/*
* user lookup functions
*/
static struct passwd *
gi_getpwnam(const char *name)
{
int rval;
if (!pwstart())
return NULL;
rval = pwscan(1, 0, name);
if (!_pw_stayopen)
endpwent();
return (rval) ? &_pw_passwd : NULL;
}
static struct passwd *
gi_getpwuid(uid_t uid)
{
int rval;
if (!pwstart())
return NULL;
rval = pwscan(1, uid, NULL);
if (!_pw_stayopen)
endpwent();
return (rval) ? &_pw_passwd : NULL;
}
static int
gi_setpassent(int stayopen)
{
if (!pwstart())
return 0;
_pw_stayopen = stayopen;
return 1;
}
static void
gi_endpwent(void)
{
_pw_filesdone = 0;
if (_pw_fp) {
(void)fclose(_pw_fp);
_pw_fp = NULL;
}
}
static int
pwstart(void)
{
_pw_filesdone = 0;
if (_pw_fp) {
rewind(_pw_fp);
return 1;
}
if (pwfile[0] == '\0') /* sanity check */
return 0;
_pw_fp = fopen(pwfile, "r");
if (_pw_fp != NULL)
return 1;
warn("Can't open `%s'", pwfile);
return 0;
}
static int
pwscan(int search, uid_t uid, const char *name)
{
if (_pw_filesdone)
return 0;
for (;;) {
if (!fgets(pwline, sizeof(pwline), _pw_fp)) {
if (!search)
_pw_filesdone = 1;
return 0;
}
/* skip lines that are too big */
if (!strchr(pwline, '\n')) {
int ch;
while ((ch = getc(_pw_fp)) != '\n' && ch != EOF)
;
continue;
}
/* skip comments */
if (pwline[0] == '#')
continue;
if (pwmatchline(search, uid, name))
return 1;
}
/* NOTREACHED */
}
static int
pwmatchline(int search, uid_t uid, const char *name)
{
unsigned long id;
char *cp, *bp, *ep;
/* name may be NULL if search is nonzero */
bp = pwline;
memset(&_pw_passwd, 0, sizeof(_pw_passwd));
_pw_passwd.pw_name = strsep(&bp, ":\n"); /* name */
if (search && name && strcmp(_pw_passwd.pw_name, name))
return 0;
_pw_passwd.pw_passwd = strsep(&bp, ":\n"); /* passwd */
if (!(cp = strsep(&bp, ":\n"))) /* uid */
return 0;
id = strtoul(cp, &ep, 10);
if (id > UID_MAX || *ep != '\0')
return 0;
_pw_passwd.pw_uid = (uid_t)id;
if (search && name == NULL && _pw_passwd.pw_uid != uid)
return 0;
if (!(cp = strsep(&bp, ":\n"))) /* gid */
return 0;
id = strtoul(cp, &ep, 10);
if (id > GID_MAX || *ep != '\0')
return 0;
_pw_passwd.pw_gid = (gid_t)id;
if (!(ep = strsep(&bp, ":"))) /* class */
return 0;
if (!(ep = strsep(&bp, ":"))) /* change */
return 0;
if (!(ep = strsep(&bp, ":"))) /* expire */
return 0;
if (!(_pw_passwd.pw_gecos = strsep(&bp, ":\n"))) /* gecos */
return 0;
if (!(_pw_passwd.pw_dir = strsep(&bp, ":\n"))) /* directory */
return 0;
if (!(_pw_passwd.pw_shell = strsep(&bp, ":\n"))) /* shell */
return 0;
if (strchr(bp, ':') != NULL)
return 0;
return 1;
}