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/*
* Copyright (c) 2015 DeNA Co., Ltd., Kazuho Oku
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include <errno.h>
#include <grp.h>
#include <pwd.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
/* taken from sysexits.h */
#ifndef EX_OSERR
#define EX_OSERR 71
#endif
#ifndef EX_CONFIG
#define EX_CONFIG 78
#endif
int main(int argc, char **argv)
{
struct passwd *user;
if (argc < 3) {
fprintf(stderr, "no command (usage: setuidgid user cmd args...)\n");
return EX_CONFIG;
}
--argc;
++argv;
errno = 0;
if ((user = getpwnam(*argv)) == NULL) {
if (errno == 0) {
fprintf(stderr, "unknown user:%s\n", *argv);
return EX_CONFIG;
} else {
perror("getpwnam");
return EX_OSERR;
}
}
--argc;
++argv;
if (setgid(user->pw_gid) != 0) {
perror("setgid failed");
return EX_OSERR;
}
if (initgroups(user->pw_name, user->pw_gid) != 0) {
perror("initgroups failed");
return EX_OSERR;
}
if (setuid(user->pw_uid) != 0) {
perror("setuid failed");
return EX_OSERR;
}
execvp(*argv, argv);
fprintf(stderr, "execvp failed to launch file:%s:%s\n", *argv, strerror(errno));
return EX_OSERR;
}
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