From 93555bfc44a0eb2039f625ab6a5badde63fa5215 Mon Sep 17 00:00:00 2001 From: Brent Cook Date: Fri, 27 Mar 2015 23:14:15 -0500 Subject: [PATCH 09/12] Notify the user when constraint support is disabled. Update the manpage and make a constraint line a fatal error if it is configured but ntpd is built without libtls present. From Paul B. Henson. --- src/usr.sbin/ntpd/config.c | 3 +++ src/usr.sbin/ntpd/constraint.c | 2 ++ src/usr.sbin/ntpd/ntpd.conf.5 | 7 +++++-- 3 files changed, 10 insertions(+), 2 deletions(-) diff --git a/src/usr.sbin/ntpd/config.c b/src/usr.sbin/ntpd/config.c index 87de17a..5a75030 100644 --- a/src/usr.sbin/ntpd/config.c +++ b/src/usr.sbin/ntpd/config.c @@ -219,6 +219,9 @@ new_constraint(void) p->id = ++constraint_maxid; p->fd = -1; +#ifndef HAVE_LIBTLS + fatal("constraint configured without libtls support"); +#endif return (p); } diff --git a/src/usr.sbin/ntpd/constraint.c b/src/usr.sbin/ntpd/constraint.c index 84d21a9..97f0cd5 100644 --- a/src/usr.sbin/ntpd/constraint.c +++ b/src/usr.sbin/ntpd/constraint.c @@ -289,12 +289,14 @@ priv_constraint_child(struct constraint *cstr, struct ntp_addr_msg *am, if (setpriority(PRIO_PROCESS, 0, 0) == -1) log_warn("could not set priority"); +#ifdef HAVE_LIBTLS /* Init TLS and load cert before chroot() */ if (tls_init() == -1) fatalx("tls_init"); if ((conf->ca = tls_load_file(CONSTRAINT_CA, &conf->ca_len, NULL)) == NULL) log_warnx("constraint certificate verification turned off"); +#endif if (chroot(pw_dir) == -1) fatal("chroot"); diff --git a/src/usr.sbin/ntpd/ntpd.conf.5 b/src/usr.sbin/ntpd/ntpd.conf.5 index 87f94e8..7f729d2 100644 --- a/src/usr.sbin/ntpd/ntpd.conf.5 +++ b/src/usr.sbin/ntpd/ntpd.conf.5 @@ -185,8 +185,11 @@ authenticated constraint, thereby reducing the impact of unauthenticated NTP man-in-the-middle attacks. Received NTP packets with time information falling outside of a range -near the constraint will be discarded and such NTP servers -will be marked as invalid. +near the constraint will be discarded and such NTP servers will be marked as +invalid. Contraints are only available if +.Xr ntpd 8 +has been compiled with libtls support. Configuring a constraint without libtls +support will result in a fatal error. .Bl -tag -width Ds .It Ic constraint from Ar url Specify the URL, IP address or the hostname of an HTTPS server to -- 2.6.4