+ uid_t old_uid = getuid();
+ gid_t old_gid = getgid();
+
+ if (pw == NULL)
+ fatal("permanently_set_uid: no user given");
+ if (temporarily_use_uid_effective)
+ fatal("permanently_set_uid: temporarily_use_uid effective");
+ debug("permanently_set_uid: %u/%u", (u_int)pw->pw_uid,
+ (u_int)pw->pw_gid);
+
+#if defined(HAVE_SETRESGID) && !defined(BROKEN_SETRESGID)
+ if (setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) < 0)
+ fatal("setresgid %u: %.100s", (u_int)pw->pw_gid, strerror(errno));
+#elif defined(HAVE_SETREGID) && !defined(BROKEN_SETREGID)
+ if (setregid(pw->pw_gid, pw->pw_gid) < 0)
+ fatal("setregid %u: %.100s", (u_int)pw->pw_gid, strerror(errno));
+#else
+ if (setegid(pw->pw_gid) < 0)
+ fatal("setegid %u: %.100s", (u_int)pw->pw_gid, strerror(errno));
+ if (setgid(pw->pw_gid) < 0)
+ fatal("setgid %u: %.100s", (u_int)pw->pw_gid, strerror(errno));
+#endif
+
+#ifdef __APPLE__
+ /*
+ * OS X requires initgroups after setgid to opt back into
+ * memberd support for >16 supplemental groups.
+ */
+ if (initgroups(pw->pw_name, pw->pw_gid) < 0)
+ fatal("initgroups %.100s %u: %.100s",
+ pw->pw_name, (u_int)pw->pw_gid, strerror(errno));
+#endif
+
+#if defined(HAVE_SETRESUID) && !defined(BROKEN_SETRESUID)
+ if (setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) < 0)
+ fatal("setresuid %u: %.100s", (u_int)pw->pw_uid, strerror(errno));
+#elif defined(HAVE_SETREUID) && !defined(BROKEN_SETREUID)
+ if (setreuid(pw->pw_uid, pw->pw_uid) < 0)
+ fatal("setreuid %u: %.100s", (u_int)pw->pw_uid, strerror(errno));
+#else
+# ifndef SETEUID_BREAKS_SETUID
+ if (seteuid(pw->pw_uid) < 0)
+ fatal("seteuid %u: %.100s", (u_int)pw->pw_uid, strerror(errno));
+# endif
+ if (setuid(pw->pw_uid) < 0)
+ fatal("setuid %u: %.100s", (u_int)pw->pw_uid, strerror(errno));
+#endif
+
+#ifndef HAVE_CYGWIN
+ /* Try restoration of GID if changed (test clearing of saved gid) */
+ if (old_gid != pw->pw_gid && pw->pw_uid != 0 &&
+ (setgid(old_gid) != -1 || setegid(old_gid) != -1))
+ fatal("%s: was able to restore old [e]gid", __func__);
+#endif
+
+ /* Verify GID drop was successful */
+ if (getgid() != pw->pw_gid || getegid() != pw->pw_gid) {
+ fatal("%s: egid incorrect gid:%u egid:%u (should be %u)",
+ __func__, (u_int)getgid(), (u_int)getegid(),
+ (u_int)pw->pw_gid);
+ }
+
+#ifndef HAVE_CYGWIN
+ /* Try restoration of UID if changed (test clearing of saved uid) */
+ if (old_uid != pw->pw_uid &&
+ (setuid(old_uid) != -1 || seteuid(old_uid) != -1))
+ fatal("%s: was able to restore old [e]uid", __func__);
+#endif
+
+ /* Verify UID drop was successful */
+ if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) {
+ fatal("%s: euid incorrect uid:%u euid:%u (should be %u)",
+ __func__, (u_int)getuid(), (u_int)geteuid(),
+ (u_int)pw->pw_uid);
+ }