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-rw-r--r--src/util/set_ugid.c61
1 files changed, 61 insertions, 0 deletions
diff --git a/src/util/set_ugid.c b/src/util/set_ugid.c
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+/*++
+/* NAME
+/* set_ugid 3
+/* SUMMARY
+/* set real, effective and saved user and group attributes
+/* SYNOPSIS
+/* #include <set_ugid.h>
+/*
+/* void set_ugid(uid, gid)
+/* uid_t uid;
+/* gid_t gid;
+/* DESCRIPTION
+/* set_ugid() sets the real, effective and saved user and group process
+/* attributes and updates the process group access list to be just the
+/* user's primary group. This operation is irreversible.
+/* DIAGNOSTICS
+/* All system call errors are fatal.
+/* SEE ALSO
+/* setuid(2), setgid(2), setgroups(2)
+/* LICENSE
+/* .ad
+/* .fi
+/* The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/* Wietse Venema
+/* IBM T.J. Watson Research
+/* P.O. Box 704
+/* Yorktown Heights, NY 10598, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <unistd.h>
+#include <grp.h>
+#include <errno.h>
+
+/* Utility library. */
+
+#include "msg.h"
+#include "set_ugid.h"
+
+/* set_ugid - set real, effective and saved user and group attributes */
+
+void set_ugid(uid_t uid, gid_t gid)
+{
+ int saved_errno = errno;
+
+ if (geteuid() != 0)
+ if (seteuid(0) < 0)
+ msg_fatal("seteuid(0): %m");
+ if (setgid(gid) < 0)
+ msg_fatal("setgid(%ld): %m", (long) gid);
+ if (setgroups(1, &gid) < 0)
+ msg_fatal("setgroups(1, &%ld): %m", (long) gid);
+ if (setuid(uid) < 0)
+ msg_fatal("setuid(%ld): %m", (long) uid);
+ if (msg_verbose > 1)
+ msg_info("setugid: uid %ld gid %ld", (long) uid, (long) gid);
+ errno = saved_errno;
+}