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/*
* Copyright (c) 2010-2018 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 <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_STRING_H
# include <string.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif /* HAVE_STRINGS_H */
#include <unistd.h>
#include <time.h>
#include <ctype.h>
#include <errno.h>
#include <pwd.h>
#include "sudoers.h"
#include "sudo_dso.h"
#if defined(HAVE_DLOPEN) || defined(HAVE_SHL_LOAD)
static void *group_handle;
static struct sudoers_group_plugin *group_plugin;
const char *path_plugin_dir = _PATH_SUDO_PLUGIN_DIR;
/*
* Load the specified plugin and run its init function.
* Returns -1 if unable to open the plugin, else it returns
* the value from the plugin's init function.
*/
int
group_plugin_load(char *plugin_info)
{
struct stat sb;
char *args, path[PATH_MAX];
char **argv = NULL;
int len, rc = -1;
debug_decl(group_plugin_load, SUDOERS_DEBUG_UTIL)
/*
* Fill in .so path and split out args (if any).
*/
if ((args = strpbrk(plugin_info, " \t")) != NULL) {
len = snprintf(path, sizeof(path), "%s%.*s",
(*plugin_info != '/') ? path_plugin_dir : "",
(int)(args - plugin_info), plugin_info);
args++;
} else {
len = snprintf(path, sizeof(path), "%s%s",
(*plugin_info != '/') ? path_plugin_dir : "", plugin_info);
}
if (len <= 0 || (size_t)len >= sizeof(path)) {
errno = ENAMETOOLONG;
sudo_warn("%s%s",
(*plugin_info != '/') ? path_plugin_dir : "", plugin_info);
goto done;
}
/* Sanity check plugin path. */
if (stat(path, &sb) != 0) {
sudo_warn("%s", path);
goto done;
}
if (sb.st_uid != ROOT_UID) {
sudo_warnx(U_("%s must be owned by uid %d"), path, ROOT_UID);
goto done;
}
if ((sb.st_mode & (S_IWGRP|S_IWOTH)) != 0) {
sudo_warnx(U_("%s must only be writable by owner"), path);
goto done;
}
/* Open plugin and map in symbol. */
group_handle = sudo_dso_load(path, SUDO_DSO_LAZY|SUDO_DSO_GLOBAL);
if (!group_handle) {
const char *errstr = sudo_dso_strerror();
sudo_warnx(U_("unable to load %s: %s"), path,
errstr ? errstr : "unknown error");
goto done;
}
group_plugin = sudo_dso_findsym(group_handle, "group_plugin");
if (group_plugin == NULL) {
sudo_warnx(U_("unable to find symbol \"group_plugin\" in %s"), path);
goto done;
}
if (SUDO_API_VERSION_GET_MAJOR(group_plugin->version) != GROUP_API_VERSION_MAJOR) {
sudo_warnx(U_("%s: incompatible group plugin major version %d, expected %d"),
path, SUDO_API_VERSION_GET_MAJOR(group_plugin->version),
GROUP_API_VERSION_MAJOR);
goto done;
}
/*
* Split args into a vector if specified.
*/
if (args != NULL) {
int ac = 0;
bool wasblank = true;
char *cp, *last;
for (cp = args; *cp != '\0'; cp++) {
if (isblank((unsigned char)*cp)) {
wasblank = true;
} else if (wasblank) {
wasblank = false;
ac++;
}
}
if (ac != 0) {
argv = reallocarray(NULL, ac, sizeof(char *));
if (argv == NULL) {
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
goto done;
}
ac = 0;
for ((cp = strtok_r(args, " \t", &last)); cp != NULL; (cp = strtok_r(NULL, " \t", &last)))
argv[ac++] = cp;
}
}
rc = (group_plugin->init)(GROUP_API_VERSION, sudo_printf, argv);
done:
free(argv);
if (rc != true) {
if (group_handle != NULL) {
sudo_dso_unload(group_handle);
group_handle = NULL;
group_plugin = NULL;
}
}
debug_return_int(rc);
}
void
group_plugin_unload(void)
{
debug_decl(group_plugin_unload, SUDOERS_DEBUG_UTIL)
if (group_plugin != NULL) {
(group_plugin->cleanup)();
group_plugin = NULL;
}
if (group_handle != NULL) {
sudo_dso_unload(group_handle);
group_handle = NULL;
}
debug_return;
}
int
group_plugin_query(const char *user, const char *group,
const struct passwd *pwd)
{
debug_decl(group_plugin_query, SUDOERS_DEBUG_UTIL)
if (group_plugin == NULL)
debug_return_int(false);
debug_return_int((group_plugin->query)(user, group, pwd));
}
#else /* !HAVE_DLOPEN && !HAVE_SHL_LOAD */
/*
* No loadable shared object support.
*/
int
group_plugin_load(char *plugin_info)
{
debug_decl(group_plugin_load, SUDOERS_DEBUG_UTIL)
debug_return_int(false);
}
void
group_plugin_unload(void)
{
debug_decl(group_plugin_unload, SUDOERS_DEBUG_UTIL)
debug_return;
}
int
group_plugin_query(const char *user, const char *group,
const struct passwd *pwd)
{
debug_decl(group_plugin_query, SUDOERS_DEBUG_UTIL)
debug_return_int(false);
}
#endif /* HAVE_DLOPEN || HAVE_SHL_LOAD */
/*
* Group plugin sudoers callback.
*/
bool
cb_group_plugin(const union sudo_defs_val *sd_un)
{
bool rc = true;
debug_decl(cb_group_plugin, SUDOERS_DEBUG_PLUGIN)
/* Unload any existing group plugin before loading a new one. */
group_plugin_unload();
if (sd_un->str != NULL)
rc = group_plugin_load(sd_un->str);
debug_return_bool(rc);
}
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