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35 lines
695 B
C++
35 lines
695 B
C++
#include <unistd.h>
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#include <stdio.h>
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#include <pwd.h>
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#include <grp.h>
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#include <alloca.h>
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extern "C" int main(int, char**);
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int main(int argc, char** argv)
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{
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uid_t uid = 0;
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gid_t gid = 0;
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if (argc > 1) {
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auto* pwd = getpwnam(argv[1]);
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if (!pwd) {
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fprintf(stderr, "No such user: %s\n", argv[1]);
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return 1;
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}
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uid = pwd->pw_uid;
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gid = pwd->pw_gid;
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}
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int rc = setgid(uid);
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if (rc < 0) {
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perror("setgid");
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return 1;
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}
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rc = setuid(gid);
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if (rc < 0) {
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perror("setuid");
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return 1;
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}
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rc = execl("/bin/sh", "sh", nullptr);
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perror("execl");
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return 1;
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}
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