95 lines
2.2 KiB
C
95 lines
2.2 KiB
C
char obwrap_c_rcsid[] =
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"$Id: ";
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/* obwrap - wrapper for omniback scripts
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*
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* Omniback leaves a lot of file descriptors open when executing its
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* pre- and post-backup scripts. This means that any program started
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* from such a script (e.g., oracle) will have open file descriptors
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* on /var/opt/omni, which is a bad thing.
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* This program closes all file descriptors except stdin and stdout,
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* changes uid (if -u is given) and executes the specified program.
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <pwd.h>
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#include <unistd.h>
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#define nonstderr stdout /* Omniback bogosity */
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char *cmnd;
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void usage(void) {
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fprintf(stderr, "Usage: %s [-u user] path arg0 ...\n", cmnd);
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exit(1);
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}
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int main(int argc, char **argv) {
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int i;
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int c;
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int open_max = sysconf(_SC_OPEN_MAX);
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cmnd = argv[0];
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while ((c = getopt(argc, argv, "u:")) != EOF) {
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switch (c) {
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case 'u': {
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char *p;
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uid_t uid;
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gid_t gid;
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uid = strtol(optarg, &p, 0);
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if (*p != '\0') {
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struct passwd *pwd = getpwnam(optarg);
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if (!pwd) {
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fprintf(nonstderr, "%s: no user %s\n", cmnd, optarg);
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exit(1);
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}
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initgroups(optarg, pwd->pw_gid);
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setresgid(pwd->pw_gid, pwd->pw_gid, pwd->pw_gid);
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if (getgid() != pwd->pw_gid) {
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fprintf(nonstderr, "%s: could not set gid %d (still %d)\n", cmnd, pwd->pw_gid, getgid());
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exit(1);
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}
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if (getegid() != pwd->pw_gid) {
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fprintf(nonstderr, "%s: could not set egid %d (still %d)\n", cmnd, pwd->pw_gid, getgid());
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exit(1);
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}
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uid = pwd->pw_uid;
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}
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setresuid(uid, uid, uid);
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if (getuid() != uid) {
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fprintf(nonstderr, "%s: could not set uid %d (still %d)\n", cmnd, uid, getuid());
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exit(1);
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}
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if (geteuid() != uid) {
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fprintf(nonstderr, "%s: could not set euid %d (still %d)\n", cmnd, uid, geteuid());
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exit(1);
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}
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break;
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}
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default:
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usage();
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}
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}
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if (optind == argc) usage();
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for (i = 2; i < open_max; i++) {
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close(i);
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}
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dup2(1, 2);
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execv(argv[optind], argv + optind + 1);
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fprintf(nonstderr, "%s: could not exec %s: %s\n",
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cmnd, argv[optind], strerror(errno));
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exit(1);
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return 0;
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}
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