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/* Just a "stupid", secure SUID wrapper around autobuild.sh */
/* Copyright (C) 2014 Luke Shumaker <lukeshu@sbcglobal.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#define _GNU_SOURCE /* for environment functions */
#include <alloca.h> /* for alloca(3) */
#include <errno.h> /* for errno */
#include <error.h> /* for error(3) */
#include <pwd.h> /* for getpwuid(3) */
#include <stdlib.h> /* for environment functions */
#include <string.h> /* for strlen(3), strcpy(3) */
#include <unistd.h> /* for geteuid(3), execv(3) */
void
mysetenv(const char *name, const char *value)
{
if (value != NULL) {
if (setenv(name, value, 1) != 0) {
error(127, errno, "could not set %s", name);
}
}
}
int
main(int argc, char **argv)
{
struct passwd *user = getpwuid(geteuid());
setreuid(geteuid(), -1);
const char *env_term = getenv("TERM");
const char *env_lang = getenv("LANG");
const char *env_lc_all = getenv("LC_ALL");
const char *env_lc_collate = getenv("LC_COLLATE");
const char *env_lc_ctype = getenv("LC_CTIME");
const char *env_lc_messages = getenv("LC_MESSAGES");
const char *env_lc_monetary = getenv("LC_MONETARY");
const char *env_lc_numeric = getenv("LC_NUMERIC");
const char *env_lc_time = getenv("LC_TIME");
clearenv();
mysetenv("USER" , user->pw_name );
mysetenv("LOGNAME" , user->pw_name );
mysetenv("HOME" , user->pw_dir );
mysetenv("TERM" , env_term );
mysetenv("LANG" , env_lang );
mysetenv("LC_ALL" , env_lc_all );
mysetenv("LC_COLLATE" , env_lc_collate );
mysetenv("LC_CTIME" , env_lc_ctype );
mysetenv("LC_MESSAGES", env_lc_messages);
mysetenv("LC_MONETARY", env_lc_monetary);
mysetenv("LC_NUMERIC" , env_lc_numeric );
mysetenv("LC_TIME" , env_lc_time );
const char *script_suffix = "/.local/bin/autobuild.sh";
char *script = alloca(strlen(user->pw_dir)+strlen(script_suffix));
strcpy(script, user->pw_dir);
strcpy(&(script[strlen(user->pw_dir)]), script_suffix);
execv(script, argv);
error(127, errno, "%s", script);
}
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