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/* $OpenBSD: getgrouplist.c,v 1.20 2009/10/22 01:23:16 guenther Exp $ */
/*
* Copyright (c) 2008 Ingo Schwarze <schwarze@usta.de>
* Copyright (c) 1991, 1993
* The Regents of the University of California. 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. 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.
*/
/*
* get credential
*/
#include <sys/types.h>
#include <sys/limits.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <grp.h>
#include <pwd.h>
#include <rpc/rpc.h>
#include <rpcsvc/yp.h>
#include <rpcsvc/ypclnt.h>
#ifdef YP
#define _PATH_NETID "/etc/netid"
#define MAXLINELENGTH 1024
static int _parse_netid(char*, uid_t, gid_t*, int*, int);
static int _read_netid(const char *, uid_t, gid_t*, int*, int);
/*
* Parse one string of the form "uid:gid[,gid[,...]]".
* If the uid matches, add the groups to the group list.
* If the groups fit, return 1, otherwise return -1.
* If the uid does not match, return 0.
*/
static int
_parse_netid(char *netid, uid_t uid, gid_t *groups, int *ngroups,
int maxgroups)
{
const char *errstr = NULL;
char *start, *p;
uid_t tuid;
gid_t gid;
int i;
/* Check the uid. */
p = strchr(netid, ':');
if (!p)
return (0);
*p++ = '\0';
tuid = (uid_t)strtonum(netid, 0, UID_MAX, &errstr);
if (errstr || tuid != uid)
return (0);
/* Loop over the gids. */
while (p && *p) {
start = p;
p = strchr(start, ',');
if (p)
*p++ = '\0';
gid = (gid_t)strtonum(start, 0, GID_MAX, &errstr);
if (errstr)
continue;
/* Skip this group if it is already in the list. */
for (i = 0; i < *ngroups; i++)
if (groups[i] == gid)
break;
/* Try to add this new group to the list. */
if (i == *ngroups) {
if (*ngroups >= maxgroups)
return (-1);
groups[(*ngroups)++] = gid;
}
}
return (1);
}
/*
* Search /etc/netid for a particular uid and process that line.
* See _parse_netid for details, including return values.
*/
static int
_read_netid(const char *key, uid_t uid, gid_t *groups, int *ngroups,
int maxgroups)
{
FILE *fp;
char line[MAXLINELENGTH], *p;
int found = 0;
fp = fopen(_PATH_NETID, "r");
if (!fp)
return (0);
while (!found && fgets(line, sizeof(line), fp)) {
p = strchr(line, '\n');
if (p)
*p = '\0';
else { /* Skip lines that are too long. */
int ch;
while ((ch = getc(fp)) != '\n' && ch != EOF)
;
continue;
}
p = strchr(line, ' ');
if (!p)
continue;
*p++ = '\0';
if (strcmp(line, key))
continue;
found = _parse_netid(p, uid, groups, ngroups, maxgroups);
}
(void)fclose(fp);
return (found);
}
#endif /* YP */
int
getgrouplist(const char *uname, gid_t agroup, gid_t *groups, int *grpcnt)
{
int i, ngroups = 0, ret = 0, maxgroups = *grpcnt, bail;
int needyp = 0, foundyp = 0;
int *skipyp = &foundyp;
extern struct group *_getgrent_yp(int *);
struct group *grp;
/*
* install primary group
*/
if (ngroups >= maxgroups) {
*grpcnt = ngroups;
return (-1);
}
groups[ngroups++] = agroup;
/*
* Scan the group file to find additional groups.
*/
setgrent();
while ((grp = _getgrent_yp(skipyp)) || foundyp) {
if (foundyp) {
if (foundyp > 0)
needyp = 1;
else
skipyp = NULL;
foundyp = 0;
continue;
}
if (grp->gr_gid == agroup)
continue;
for (bail = 0, i = 0; bail == 0 && i < ngroups; i++)
if (groups[i] == grp->gr_gid)
bail = 1;
if (bail)
continue;
for (i = 0; grp->gr_mem[i]; i++) {
if (!strcmp(grp->gr_mem[i], uname)) {
if (ngroups >= maxgroups) {
ret = -1;
goto out;
}
groups[ngroups++] = grp->gr_gid;
break;
}
}
}
#ifdef YP
/*
* If we were told that there is a YP marker, look at netid data.
*/
if (skipyp && needyp) {
char buf[MAXLINELENGTH], *ypdata = NULL, *key;
static char *__ypdomain;
struct passwd pwstore;
int ypdatalen;
/* Construct the netid key to look up. */
if (getpwnam_r(uname, &pwstore, buf, sizeof buf, NULL) ||
!__ypdomain && yp_get_default_domain(&__ypdomain))
goto out;
asprintf(&key, "unix.%u@%s", pwstore.pw_uid, __ypdomain);
if (key == NULL)
goto out;
/* First scan the static netid file. */
switch (_read_netid(key, pwstore.pw_uid,
groups, &ngroups, maxgroups)) {
case -1:
ret = -1;
/* FALLTHROUGH */
case 1:
goto out;
default:
break;
}
/* Only access YP when there is no static entry. */
if (!yp_bind(__ypdomain) &&
!yp_match(__ypdomain, "netid.byname", key,
(int)strlen(key), &ypdata, &ypdatalen))
if (_parse_netid(ypdata, pwstore.pw_uid,
groups, &ngroups, maxgroups) == -1)
ret = -1;
free(key);
free(ypdata);
}
#endif /* YP */
out:
endgrent();
*grpcnt = ngroups;
return (ret);
}
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