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From 8e59facf2906e02c93eb63c69342b622836ea384 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 09/15] Notify the user when constraint support is disabled.
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Update the manpage and warn if constraints are
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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/constraint.c | 2 ++
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src/usr.sbin/ntpd/ntpd.conf.5 | 11 +++++++++--
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3 files changed, 14 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 e243818c25..856c3147cc 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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@@ -187,6 +187,9 @@ new_constraint(void)
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p->id = ++constraint_maxid;
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p->fd = -1;
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+#ifndef HAVE_LIBTLS
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+ log_warnx("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/constraint.c b/src/usr.sbin/ntpd/constraint.c
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index 6529070d14..f23d363889 100644
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--- a/src/usr.sbin/ntpd/constraint.c
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+++ b/src/usr.sbin/ntpd/constraint.c
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@@ -354,12 +354,14 @@ priv_constraint_child(const char *pw_dir, uid_t pw_uid, gid_t pw_gid)
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if (setpriority(PRIO_PROCESS, 0, 0) == -1)
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log_warn("could not set priority");
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+#ifdef HAVE_LIBTLS
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/* Init TLS and load CA certs before chroot() */
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if (tls_init() == -1)
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fatalx("tls_init");
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if ((conf->ca = tls_load_file(tls_default_ca_cert_file(),
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&conf->ca_len, NULL)) == NULL)
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fatalx("failed to load constraint ca");
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+#endif
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if (chroot(pw_dir) == -1)
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fatal("chroot");
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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 98368d914b..bd7314c63b 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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@@ -216,8 +216,15 @@ 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.
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+.Pp
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+Support for constraints is only available if
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+.Xr ntpd 8
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+has been linked with libtls from LibreSSL. Configuring a constraint
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+without libtls causes
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+.Xr ntpd 8
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+to log a warning message on startup.
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.Bl -tag -width Ds
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.It Ic constraint from Ar url [ip...]
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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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2.27.0
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