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