48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
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#include <sys/types.h>
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#include <pwd.h>
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#include <unistd.h>
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#include <grp.h>
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#include <stdio.h>
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#include <stdlib.h>
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static int prot_gid(gid_t gid)
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{
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if (setgroups(1,&gid) == -1) return -1;
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return setgid(gid); /* _should_ be redundant, but on some systems it isn't */
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}
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const char *account;
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struct passwd *pw;
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int main(int argc, char **argv, char **envp)
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{
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account = *++argv;
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if (!account || !*++argv) {
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fprintf(stderr, "setuidgids: usage: setuidgids account child");
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exit(EXIT_FAILURE);
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}
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pw = getpwnam(account);
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if (!pw) {
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fprintf(stderr, "setuidgids: FATAL: unknown account %s", account);
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return EXIT_FAILURE;
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}
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if (prot_gid(pw->pw_gid) == -1) {
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fprintf(stderr, "setuidgids: FATAL: unable to setgid\n");
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return EXIT_FAILURE;
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}
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if (initgroups(pw->pw_name, pw->pw_gid) == -1) {
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fprintf(stderr, "setuidgids: FATAL: unable to initgroups\n");
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return EXIT_FAILURE;
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}
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if (setuid(pw->pw_uid) == -1) {
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fprintf(stderr, "setuidgids: FATAL: unable to setuid\n");
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return EXIT_FAILURE;
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}
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execvpe(*argv,argv,envp);
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fprintf(stderr, "setuidgids: FATAL: unable to run %s\n", *argv);
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return EXIT_FAILURE;
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}
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