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From c964f9f8a4ca92d961255935ac1ed2f681702607 Mon Sep 17 00:00:00 2001
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From: Brent Cook <busterb@gmail.com>
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Date: Fri, 27 Mar 2015 23:14:15 -0500
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Subject: [PATCH 11/11] Notify the user when constraint support is disabled.
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Update the manpage and make a constraint line a fatal error if it is
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configured but ntpd is built without libtls present.
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From Paul B. Henson.
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---
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src/usr.sbin/ntpd/config.c | 3 +++
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src/usr.sbin/ntpd/ntp.c | 2 ++
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src/usr.sbin/ntpd/ntpd.conf.5 | 7 +++++--
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3 files changed, 10 insertions(+), 2 deletions(-)
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diff --git a/src/usr.sbin/ntpd/config.c b/src/usr.sbin/ntpd/config.c
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index 2e39604..779aed6 100644
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--- a/src/usr.sbin/ntpd/config.c
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+++ b/src/usr.sbin/ntpd/config.c
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@@ -218,6 +218,9 @@ new_constraint(void)
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fatal("new_constraint calloc");
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p->id = ++constraint_maxid;
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+#ifndef HAVE_LIBTLS
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+ fatal("constraint configured without libtls support");
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+#endif
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return (p);
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}
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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 0a9b4be..eb8af7b 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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@@ -112,10 +112,12 @@ ntp_main(int pipe_prnt[2], int fd_ctl, struct ntpd_conf *nconf,
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tls_init();
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+#ifdef HAVE_LIBTLS
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/* Verification will be turned off if CA is not found */
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if ((conf->ca = tls_load_file(CONSTRAINT_CA,
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&conf->ca_len, NULL)) == NULL)
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log_warnx("constraint certificate verification turned off");
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+#endif
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/* in this case the parent didn't init logging and didn't daemonize */
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if (nconf->settime && !nconf->debug) {
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diff --git a/src/usr.sbin/ntpd/ntpd.conf.5 b/src/usr.sbin/ntpd/ntpd.conf.5
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index 25efcae..2dee297 100644
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--- a/src/usr.sbin/ntpd/ntpd.conf.5
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+++ b/src/usr.sbin/ntpd/ntpd.conf.5
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@@ -191,8 +191,11 @@ authenticated constraint,
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thereby reducing the impact of unauthenticated NTP
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man-in-the-middle attacks.
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Received NTP packets with time information falling outside of a range
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-near the constraint will be discarded and such NTP servers
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-will be marked as invalid.
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+near the constraint will be discarded and such NTP servers will be marked as
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+invalid. Contraints are only available if
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+.Xr ntpd 8
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+has been compiled with libtls support. Configuring a constraint without libtls
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+support will result in a fatal error.
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.Bl -tag -width Ds
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.It Ic constraint from Ar url
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Specify the URL, IP address or the hostname of an HTTPS server to
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--
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1.9.1
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