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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2010-2014 Todd C. Miller <Todd.Miller@sudo.ws>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_STDBOOL_H
# include <stdbool.h>
#else
# include <compat/stdbool.h>
#endif /* HAVE_STDBOOL_H */
#include <string.h>
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif /* HAVE_STRINGS_H */
#include <grp.h>
#include <sudo_compat.h>
#include <sudo_dso.h>
#include <sudo_plugin.h>
#include <sudo_util.h>
/*
* Sudoers group plugin that does group name-based lookups using the system
* group database functions, similar to how sudo behaved prior to 1.7.3.
* This can be used on systems where lookups by group ID are problematic.
*/
typedef struct group * (*sysgroup_getgrnam_t)(const char *);
typedef struct group * (*sysgroup_getgrgid_t)(gid_t);
typedef void (*sysgroup_gr_delref_t)(struct group *);
static sysgroup_getgrnam_t sysgroup_getgrnam;
static sysgroup_getgrgid_t sysgroup_getgrgid;
static sysgroup_gr_delref_t sysgroup_gr_delref;
static bool need_setent;
static int
sysgroup_init(int version, sudo_printf_t plugin_printf, char *const argv[])
{
void *handle;
if (SUDO_API_VERSION_GET_MAJOR(version) != GROUP_API_VERSION_MAJOR) {
plugin_printf(SUDO_CONV_ERROR_MSG,
"sysgroup_group: incompatible major version %d, expected %d\n",
SUDO_API_VERSION_GET_MAJOR(version),
GROUP_API_VERSION_MAJOR);
return -1;
}
/* Share group cache with sudo if possible. */
handle = sudo_dso_findsym(SUDO_DSO_DEFAULT, "sudo_getgrnam");
if (handle != NULL) {
sysgroup_getgrnam = (sysgroup_getgrnam_t)handle;
} else {
sysgroup_getgrnam = (sysgroup_getgrnam_t)getgrnam;
need_setent = true;
}
handle = sudo_dso_findsym(SUDO_DSO_DEFAULT, "sudo_getgrgid");
if (handle != NULL) {
sysgroup_getgrgid = (sysgroup_getgrgid_t)handle;
} else {
sysgroup_getgrgid = (sysgroup_getgrgid_t)getgrgid;
need_setent = true;
}
handle = sudo_dso_findsym(SUDO_DSO_DEFAULT, "sudo_gr_delref");
if (handle != NULL)
sysgroup_gr_delref = (sysgroup_gr_delref_t)handle;
if (need_setent)
setgrent();
return true;
}
static void
sysgroup_cleanup(void)
{
if (need_setent)
endgrent();
}
/*
* Returns true if "user" is a member of "group", else false.
*/
static int
sysgroup_query(const char *user, const char *group, const struct passwd *pwd)
{
char **member;
struct group *grp;
grp = sysgroup_getgrnam(group);
if (grp == NULL && group[0] == '#' && group[1] != '\0') {
const char *errstr;
gid_t gid = sudo_strtoid(group + 1, &errstr);
if (errstr == NULL)
grp = sysgroup_getgrgid(gid);
}
if (grp != NULL) {
if (grp->gr_mem != NULL) {
for (member = grp->gr_mem; *member != NULL; member++) {
if (strcasecmp(user, *member) == 0) {
if (sysgroup_gr_delref)
sysgroup_gr_delref(grp);
return true;
}
}
}
if (sysgroup_gr_delref)
sysgroup_gr_delref(grp);
}
return false;
}
sudo_dso_public struct sudoers_group_plugin group_plugin = {
GROUP_API_VERSION,
sysgroup_init,
sysgroup_cleanup,
sysgroup_query
};
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