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