706 lines
14 KiB
C
706 lines
14 KiB
C
/*
|
|
* Copyright (c) 1989, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
* Portions Copyright (c) 1994, Jason Downs. 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.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. 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.
|
|
*/
|
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
static char sccsid[] = "@(#)getgrent.c 8.2 (Berkeley) 3/21/94";
|
|
#endif /* LIBC_SCCS and not lint */
|
|
/* $NetBSD: getgrent.c,v 1.34.2.1 1999/04/27 14:10:58 perry Exp $ */
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/types.h>
|
|
|
|
#include <errno.h>
|
|
#include <grp.h>
|
|
#include <limits.h>
|
|
#include <nsswitch.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <syslog.h>
|
|
|
|
#ifdef HESIOD
|
|
#include <hesiod.h>
|
|
#include <arpa/nameser.h>
|
|
#endif
|
|
#ifdef YP
|
|
#include <rpc/rpc.h>
|
|
#include <rpcsvc/yp_prot.h>
|
|
#include <rpcsvc/ypclnt.h>
|
|
#endif
|
|
|
|
#if defined(YP) || defined(HESIOD)
|
|
#define _GROUP_COMPAT
|
|
#endif
|
|
|
|
static FILE *_gr_fp;
|
|
static struct group _gr_group;
|
|
static int _gr_stayopen;
|
|
static int _gr_filesdone;
|
|
|
|
static void grcleanup(void);
|
|
static int grscan(int, gid_t, const char *);
|
|
static char *getline(void);
|
|
static int copyline(const char*);
|
|
static int matchline(int, gid_t, const char *);
|
|
static int start_gr(void);
|
|
|
|
|
|
|
|
|
|
/* initial size for malloc and increase steps for realloc */
|
|
#define MAXGRP 64
|
|
#define MAXLINELENGTH 256
|
|
|
|
#ifdef HESIOD
|
|
#if MAXLINELENGTH < NS_MAXLABEL + 1
|
|
#error "MAXLINELENGTH must be at least NS_MAXLABEL + 1"
|
|
#endif
|
|
#endif
|
|
|
|
static char **members; /* list of group members */
|
|
static int maxgrp; /* current length of **members */
|
|
static char *line; /* buffer for group line */
|
|
static int maxlinelength; /* current length of *line */
|
|
|
|
/*
|
|
* Lines longer than MAXLINELENGTHLIMIT will be counted as an error.
|
|
* <= 0 disable check for maximum line length
|
|
* 256K is enough for 64,000 uids
|
|
*/
|
|
#define MAXLINELENGTHLIMIT (256 * 1024)
|
|
|
|
#ifdef YP
|
|
static char *__ypcurrent, *__ypdomain;
|
|
static int __ypcurrentlen;
|
|
static int _gr_ypdone;
|
|
#endif
|
|
|
|
#ifdef HESIOD
|
|
static int _gr_hesnum;
|
|
#endif
|
|
|
|
#ifdef _GROUP_COMPAT
|
|
enum _grmode { GRMODE_NONE, GRMODE_FULL, GRMODE_NAME };
|
|
static enum _grmode __grmode;
|
|
#endif
|
|
|
|
struct group *
|
|
getgrent()
|
|
{
|
|
if ((!_gr_fp && !start_gr()) || !grscan(0, 0, NULL))
|
|
return (NULL);
|
|
return &_gr_group;
|
|
}
|
|
|
|
struct group *
|
|
getgrnam(name)
|
|
const char *name;
|
|
{
|
|
int rval;
|
|
|
|
if (!start_gr())
|
|
return NULL;
|
|
rval = grscan(1, 0, name);
|
|
if (!_gr_stayopen)
|
|
endgrent();
|
|
return (rval) ? &_gr_group : NULL;
|
|
}
|
|
|
|
struct group *
|
|
getgrgid(gid)
|
|
gid_t gid;
|
|
{
|
|
int rval;
|
|
|
|
if (!start_gr())
|
|
return NULL;
|
|
rval = grscan(1, gid, NULL);
|
|
if (!_gr_stayopen)
|
|
endgrent();
|
|
return (rval) ? &_gr_group : NULL;
|
|
}
|
|
|
|
void
|
|
grcleanup()
|
|
{
|
|
_gr_filesdone = 0;
|
|
#ifdef YP
|
|
if (__ypcurrent)
|
|
free(__ypcurrent);
|
|
__ypcurrent = NULL;
|
|
_gr_ypdone = 0;
|
|
#endif
|
|
#ifdef HESIOD
|
|
_gr_hesnum = 0;
|
|
#endif
|
|
#ifdef _GROUP_COMPAT
|
|
__grmode = GRMODE_NONE;
|
|
#endif
|
|
}
|
|
|
|
static int
|
|
start_gr()
|
|
{
|
|
grcleanup();
|
|
if (maxlinelength == 0) {
|
|
if ((line = (char *)malloc(MAXLINELENGTH)) == NULL)
|
|
return 0;
|
|
maxlinelength = MAXLINELENGTH;
|
|
}
|
|
if (maxgrp == 0) {
|
|
if ((members = (char **) malloc(sizeof(char**) *
|
|
MAXGRP)) == NULL)
|
|
return 0;
|
|
maxgrp = MAXGRP;
|
|
}
|
|
if (_gr_fp) {
|
|
rewind(_gr_fp);
|
|
return 1;
|
|
}
|
|
return (_gr_fp = fopen(_PATH_GROUP, "r")) ? 1 : 0;
|
|
}
|
|
|
|
int
|
|
setgrent(void)
|
|
{
|
|
return setgroupent(0);
|
|
}
|
|
|
|
int
|
|
setgroupent(stayopen)
|
|
int stayopen;
|
|
{
|
|
if (!start_gr())
|
|
return 0;
|
|
_gr_stayopen = stayopen;
|
|
return 1;
|
|
}
|
|
|
|
void
|
|
endgrent()
|
|
{
|
|
grcleanup();
|
|
if (_gr_fp) {
|
|
(void)fclose(_gr_fp);
|
|
_gr_fp = NULL;
|
|
}
|
|
}
|
|
|
|
|
|
static int _local_grscan(void *, void *, va_list);
|
|
|
|
/*ARGSUSED*/
|
|
static int
|
|
_local_grscan(rv, cb_data, ap)
|
|
void *rv;
|
|
void *cb_data;
|
|
va_list ap;
|
|
{
|
|
int search = va_arg(ap, int);
|
|
gid_t gid = va_arg(ap, gid_t);
|
|
const char *name = va_arg(ap, const char *);
|
|
|
|
if (_gr_filesdone)
|
|
return NS_NOTFOUND;
|
|
for (;;) {
|
|
if (getline() == NULL) {
|
|
if (!search)
|
|
_gr_filesdone = 1;
|
|
return NS_NOTFOUND;
|
|
}
|
|
if (matchline(search, gid, name))
|
|
return NS_SUCCESS;
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
#ifdef HESIOD
|
|
static int _dns_grscan(void *, void *, va_list);
|
|
|
|
/*ARGSUSED*/
|
|
static int
|
|
_dns_grscan(rv, cb_data, ap)
|
|
void *rv;
|
|
void *cb_data;
|
|
va_list ap;
|
|
{
|
|
int search = va_arg(ap, int);
|
|
gid_t gid = va_arg(ap, gid_t);
|
|
const char *name = va_arg(ap, const char *);
|
|
|
|
char **hp;
|
|
void *context;
|
|
int r;
|
|
size_t sz;
|
|
|
|
r = NS_UNAVAIL;
|
|
if (!search && _gr_hesnum == -1)
|
|
return NS_NOTFOUND;
|
|
if (hesiod_init(&context) == -1)
|
|
return (r);
|
|
|
|
for (;;) {
|
|
if (search) {
|
|
if (name)
|
|
strlcpy(line, name, maxlinelength);
|
|
else
|
|
snprintf(line, maxlinelength, "%u",
|
|
(unsigned int)gid);
|
|
} else {
|
|
snprintf(line, maxlinelength, "group-%u", _gr_hesnum);
|
|
_gr_hesnum++;
|
|
}
|
|
|
|
hp = hesiod_resolve(context, line, "group");
|
|
if (hp == NULL) {
|
|
if (errno == ENOENT) {
|
|
if (!search)
|
|
_gr_hesnum = -1;
|
|
r = NS_NOTFOUND;
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* only check first elem */
|
|
if (copyline(hp[0]) == 0)
|
|
return NS_UNAVAIL;
|
|
hesiod_free_list(context, hp);
|
|
if (matchline(search, gid, name)) {
|
|
r = NS_SUCCESS;
|
|
break;
|
|
} else if (search) {
|
|
r = NS_NOTFOUND;
|
|
break;
|
|
}
|
|
}
|
|
hesiod_end(context);
|
|
return (r);
|
|
}
|
|
#endif
|
|
|
|
#ifdef YP
|
|
static int _nis_grscan(void *, void *, va_list);
|
|
|
|
/*ARGSUSED*/
|
|
static int
|
|
_nis_grscan(rv, cb_data, ap)
|
|
void *rv;
|
|
void *cb_data;
|
|
va_list ap;
|
|
{
|
|
int search = va_arg(ap, int);
|
|
gid_t gid = va_arg(ap, gid_t);
|
|
const char *name = va_arg(ap, const char *);
|
|
|
|
char *key, *data;
|
|
int keylen, datalen;
|
|
int r;
|
|
size_t sz;
|
|
|
|
if(__ypdomain == NULL) {
|
|
switch (yp_get_default_domain(&__ypdomain)) {
|
|
case 0:
|
|
break;
|
|
case YPERR_RESRC:
|
|
return NS_TRYAGAIN;
|
|
default:
|
|
return NS_UNAVAIL;
|
|
}
|
|
}
|
|
|
|
if (search) { /* specific group or gid */
|
|
if (name)
|
|
strlcpy(line, name, maxlinelength);
|
|
else
|
|
snprintf(line, maxlinelength, "%u", (unsigned int)gid);
|
|
data = NULL;
|
|
r = yp_match(__ypdomain,
|
|
(name) ? "group.byname" : "group.bygid",
|
|
line, (int)strlen(line), &data, &datalen);
|
|
switch (r) {
|
|
case 0:
|
|
break;
|
|
case YPERR_KEY:
|
|
if (data)
|
|
free(data);
|
|
return NS_NOTFOUND;
|
|
default:
|
|
if (data)
|
|
free(data);
|
|
return NS_UNAVAIL;
|
|
}
|
|
data[datalen] = '\0'; /* clear trailing \n */
|
|
if (copyline(data) == 0)
|
|
return NS_UNAVAIL;
|
|
free(data);
|
|
if (matchline(search, gid, name))
|
|
return NS_SUCCESS;
|
|
else
|
|
return NS_NOTFOUND;
|
|
}
|
|
|
|
/* ! search */
|
|
if (_gr_ypdone)
|
|
return NS_NOTFOUND;
|
|
for (;;) {
|
|
data = NULL;
|
|
if(__ypcurrent) {
|
|
key = NULL;
|
|
r = yp_next(__ypdomain, "group.byname",
|
|
__ypcurrent, __ypcurrentlen,
|
|
&key, &keylen, &data, &datalen);
|
|
free(__ypcurrent);
|
|
switch (r) {
|
|
case 0:
|
|
break;
|
|
case YPERR_NOMORE:
|
|
__ypcurrent = NULL;
|
|
if (key)
|
|
free(key);
|
|
if (data)
|
|
free(data);
|
|
_gr_ypdone = 1;
|
|
return NS_NOTFOUND;
|
|
default:
|
|
if (key)
|
|
free(key);
|
|
if (data)
|
|
free(data);
|
|
return NS_UNAVAIL;
|
|
}
|
|
__ypcurrent = key;
|
|
__ypcurrentlen = keylen;
|
|
} else {
|
|
if (yp_first(__ypdomain, "group.byname",
|
|
&__ypcurrent, &__ypcurrentlen,
|
|
&data, &datalen)) {
|
|
if (data)
|
|
free(data);
|
|
return NS_UNAVAIL;
|
|
}
|
|
}
|
|
data[datalen] = '\0'; /* clear trailing \n */
|
|
if (copyline(data) == 0)
|
|
return NS_UNAVAIL;
|
|
free(data);
|
|
if (matchline(search, gid, name))
|
|
return NS_SUCCESS;
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
#endif
|
|
|
|
#ifdef _GROUP_COMPAT
|
|
/*
|
|
* log an error if "files" or "compat" is specified in group_compat database
|
|
*/
|
|
static int _bad_grscan(void *, void *, va_list);
|
|
|
|
/*ARGSUSED*/
|
|
static int
|
|
_bad_grscan(rv, cb_data, ap)
|
|
void *rv;
|
|
void *cb_data;
|
|
va_list ap;
|
|
{
|
|
static int warned;
|
|
|
|
if (!warned) {
|
|
syslog(LOG_ERR,
|
|
"nsswitch.conf group_compat database can't use '%s'",
|
|
(char *)cb_data);
|
|
}
|
|
warned = 1;
|
|
return NS_UNAVAIL;
|
|
}
|
|
|
|
/*
|
|
* when a name lookup in compat mode is required, look it up in group_compat
|
|
* nsswitch database. only Hesiod and NIS is supported - it doesn't make
|
|
* sense to lookup compat names from 'files' or 'compat'
|
|
*/
|
|
|
|
static int __grscancompat(int, gid_t, const char *);
|
|
|
|
static int
|
|
__grscancompat(search, gid, name)
|
|
int search;
|
|
gid_t gid;
|
|
const char *name;
|
|
{
|
|
static const ns_dtab dtab[] = {
|
|
NS_FILES_CB(_bad_grscan, "files")
|
|
NS_DNS_CB(_dns_grscan, NULL)
|
|
NS_NIS_CB(_nis_grscan, NULL)
|
|
NS_COMPAT_CB(_bad_grscan, "compat")
|
|
{ 0 }
|
|
};
|
|
static const ns_src defaultnis[] = {
|
|
{ NSSRC_NIS, NS_SUCCESS },
|
|
{ 0 }
|
|
};
|
|
|
|
return (nsdispatch(NULL, dtab, NSDB_GROUP_COMPAT, "grscancompat",
|
|
defaultnis, search, gid, name));
|
|
}
|
|
#endif
|
|
|
|
|
|
static int _compat_grscan(void *, void *, va_list);
|
|
|
|
/*ARGSUSED*/
|
|
static int
|
|
_compat_grscan(rv, cb_data, ap)
|
|
void *rv;
|
|
void *cb_data;
|
|
va_list ap;
|
|
{
|
|
int search = va_arg(ap, int);
|
|
gid_t gid = va_arg(ap, gid_t);
|
|
const char *name = va_arg(ap, const char *);
|
|
|
|
#ifdef _GROUP_COMPAT
|
|
static char *grname = NULL;
|
|
#endif
|
|
|
|
for (;;) {
|
|
#ifdef _GROUP_COMPAT
|
|
if(__grmode != GRMODE_NONE) {
|
|
int r;
|
|
|
|
switch(__grmode) {
|
|
case GRMODE_FULL:
|
|
r = __grscancompat(search, gid, name);
|
|
if (r == NS_SUCCESS)
|
|
return r;
|
|
__grmode = GRMODE_NONE;
|
|
break;
|
|
case GRMODE_NAME:
|
|
if(grname == (char *)NULL) {
|
|
__grmode = GRMODE_NONE;
|
|
break;
|
|
}
|
|
r = __grscancompat(1, 0, grname);
|
|
free(grname);
|
|
grname = (char *)NULL;
|
|
if (r != NS_SUCCESS)
|
|
break;
|
|
if (!search)
|
|
return NS_SUCCESS;
|
|
if (name) {
|
|
if (! strcmp(_gr_group.gr_name, name))
|
|
return NS_SUCCESS;
|
|
} else {
|
|
if (_gr_group.gr_gid == gid)
|
|
return NS_SUCCESS;
|
|
}
|
|
break;
|
|
case GRMODE_NONE:
|
|
abort();
|
|
}
|
|
continue;
|
|
}
|
|
#endif /* _GROUP_COMPAT */
|
|
|
|
if (getline() == NULL)
|
|
return NS_NOTFOUND;
|
|
|
|
#ifdef _GROUP_COMPAT
|
|
if (line[0] == '+') {
|
|
char *tptr, *bp;
|
|
|
|
switch(line[1]) {
|
|
case ':':
|
|
case '\0':
|
|
case '\n':
|
|
__grmode = GRMODE_FULL;
|
|
break;
|
|
default:
|
|
__grmode = GRMODE_NAME;
|
|
bp = line;
|
|
tptr = strsep(&bp, ":\n");
|
|
grname = strdup(tptr + 1);
|
|
break;
|
|
}
|
|
continue;
|
|
}
|
|
#endif /* _GROUP_COMPAT */
|
|
if (matchline(search, gid, name))
|
|
return NS_SUCCESS;
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
static int
|
|
grscan(search, gid, name)
|
|
int search;
|
|
gid_t gid;
|
|
const char *name;
|
|
{
|
|
int r;
|
|
static const ns_dtab dtab[] = {
|
|
NS_FILES_CB(_local_grscan, NULL)
|
|
NS_DNS_CB(_dns_grscan, NULL)
|
|
NS_NIS_CB(_nis_grscan, NULL)
|
|
NS_COMPAT_CB(_compat_grscan, NULL)
|
|
{ 0 }
|
|
};
|
|
static const ns_src compatsrc[] = {
|
|
{ NSSRC_COMPAT, NS_SUCCESS },
|
|
{ 0 }
|
|
};
|
|
|
|
r = nsdispatch(NULL, dtab, NSDB_GROUP, "grscan", compatsrc,
|
|
search, gid, name);
|
|
return (r == NS_SUCCESS) ? 1 : 0;
|
|
}
|
|
|
|
static int
|
|
matchline(search, gid, name)
|
|
int search;
|
|
gid_t gid;
|
|
const char *name;
|
|
{
|
|
unsigned long id;
|
|
char **m;
|
|
char *cp, *bp, *ep;
|
|
|
|
if (line[0] == '+')
|
|
return 0; /* sanity check to prevent recursion */
|
|
bp = line;
|
|
_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 (*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]) {
|
|
members = (char **) reallocf(members, sizeof(char **) *
|
|
(maxgrp + MAXGRP));
|
|
if (members == NULL)
|
|
return 0;
|
|
_gr_group.gr_mem = members;
|
|
m = &members[maxgrp - 1];
|
|
maxgrp += MAXGRP;
|
|
}
|
|
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;
|
|
}
|
|
|
|
static char *
|
|
getline(void)
|
|
{
|
|
const char *cp;
|
|
|
|
tryagain:
|
|
if (fgets(line, maxlinelength, _gr_fp) == NULL)
|
|
return NULL;
|
|
if (index(line, '\n') == NULL) {
|
|
do {
|
|
if (feof(_gr_fp))
|
|
return NULL;
|
|
if (MAXLINELENGTHLIMIT > 0 &&
|
|
maxlinelength >= MAXLINELENGTHLIMIT)
|
|
return NULL;
|
|
line = (char *)reallocf(line, maxlinelength +
|
|
MAXLINELENGTH);
|
|
if (line == NULL)
|
|
return NULL;
|
|
if (fgets(line + maxlinelength - 1,
|
|
MAXLINELENGTH + 1, _gr_fp) == NULL)
|
|
return NULL;
|
|
maxlinelength += MAXLINELENGTH;
|
|
} while (index(line + maxlinelength - MAXLINELENGTH - 1,
|
|
'\n') == NULL);
|
|
}
|
|
|
|
|
|
/*
|
|
* Ignore comments: ^[ \t]*#
|
|
*/
|
|
for (cp = line; *cp != '\0'; cp++)
|
|
if (*cp != ' ' && *cp != '\t')
|
|
break;
|
|
if (*cp == '#' || *cp == '\0')
|
|
goto tryagain;
|
|
|
|
if (cp != line) /* skip white space at beginning of line */
|
|
bcopy(cp, line, strlen(cp));
|
|
|
|
return line;
|
|
}
|
|
|
|
static int
|
|
copyline(const char *src)
|
|
{
|
|
size_t sz;
|
|
|
|
sz = strlen(src);
|
|
if (sz > maxlinelength - 1) {
|
|
sz = ((sz/MAXLINELENGTH)+1) * MAXLINELENGTH;
|
|
if ((line = (char *) reallocf(line, sz)) == NULL)
|
|
return 0;
|
|
maxlinelength = sz;
|
|
}
|
|
strlcpy(line, src, maxlinelength);
|
|
return 1;
|
|
}
|
|
|