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From 360d2de5b706fda9555348d4df4eb78a5eed7b3d Mon Sep 17 00:00:00 2001
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From: Brent Cook <busterb@gmail.com>
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Date: Thu, 1 Jan 2015 13:26:29 -0600
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Subject: [PATCH 02/11] do not allow privsep user to be a privileged user
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This may need to be a function call for different platforms with
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different capability / privilege mechanisms.
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---
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src/usr.sbin/ntpd/ntp.c | 6 ++++++
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1 file changed, 6 insertions(+)
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diff --git a/src/usr.sbin/ntpd/ntp.c b/src/usr.sbin/ntpd/ntp.c
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index 1553cc0..9c96c47 100644
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--- a/src/usr.sbin/ntpd/ntp.c
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+++ b/src/usr.sbin/ntpd/ntp.c
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@@ -145,6 +145,12 @@ ntp_main(int pipe_prnt[2], int fd_ctl, struct ntpd_conf *nconf,
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conf = nconf;
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setup_listeners(se, conf, &listener_cnt);
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+ if (pw->pw_uid == 0 || pw->pw_gid == 0)
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+ fatal("privsep user cannot be root");
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+
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+ if (pw->pw_uid == geteuid() || pw->pw_gid == getegid())
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+ fatal("privsep user cannot be the privileged user");
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+
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if (setgroups(1, &pw->pw_gid) ||
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setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) ||
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setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid))
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--
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1.9.1
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