ntp: Audit NTP parameters adjustment

Emit an audit record every time selected NTP parameters are modified
from userspace (via adjtimex(2) or clock_adjtime(2)). These parameters
may be used to indirectly change system clock, and thus their
modifications should be audited.

Such events will now generate records of type AUDIT_TIME_ADJNTPVAL
containing the following fields:
  - op -- which value was adjusted:
    - offset -- corresponding to the time_offset variable
    - freq   -- corresponding to the time_freq variable
    - status -- corresponding to the time_status variable
    - adjust -- corresponding to the time_adjust variable
    - tick   -- corresponding to the tick_usec variable
    - tai    -- corresponding to the timekeeping's TAI offset
  - old -- the old value
  - new -- the new value

Example records:

type=TIME_ADJNTPVAL msg=audit(1530616044.507:7): op=status old=64 new=8256
type=TIME_ADJNTPVAL msg=audit(1530616044.511:11): op=freq old=0 new=49180377088000

The records of this type will be associated with the corresponding
syscall records.

An overview of parameter changes that can be done via do_adjtimex()
(based on information from Miroslav Lichvar) and whether they are
audited:
  __timekeeping_set_tai_offset() -- sets the offset from the
                                    International Atomic Time
                                    (AUDITED)
  NTP variables:
    time_offset -- can adjust the clock by up to 0.5 seconds per call
                   and also speed it up or slow down by up to about
                   0.05% (43 seconds per day) (AUDITED)
    time_freq -- can speed up or slow down by up to about 0.05%
                 (AUDITED)
    time_status -- can insert/delete leap seconds and it also enables/
                   disables synchronization of the hardware real-time
                   clock (AUDITED)
    time_maxerror, time_esterror -- change error estimates used to
                                    inform userspace applications
                                    (NOT AUDITED)
    time_constant -- controls the speed of the clock adjustments that
                     are made when time_offset is set (NOT AUDITED)
    time_adjust -- can temporarily speed up or slow down the clock by up
                   to 0.05% (AUDITED)
    tick_usec -- a more extreme version of time_freq; can speed up or
                 slow down the clock by up to 10% (AUDITED)

Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>
Reviewed-by: Richard Guy Briggs <rgb@redhat.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Paul Moore <paul@paul-moore.com>

4 files changed, 50 insertions, 5 deletions

diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 3843495d0083..5371b59bde36 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -2519,6 +2519,28 @@ void __audit_tk_injoffset(struct timespec64 offset)
 		  (long long)offset.tv_sec, offset.tv_nsec);
 }
 
+static void audit_log_ntp_val(const struct audit_ntp_data *ad,
+			      const char *op, enum audit_ntp_type type)
+{
+	const struct audit_ntp_val *val = &ad->vals[type];
+
+	if (val->newval == val->oldval)
+		return;
+
+	audit_log(audit_context(), GFP_KERNEL, AUDIT_TIME_ADJNTPVAL,
+		  "op=%s old=%lli new=%lli", op, val->oldval, val->newval);
+}
+
+void __audit_ntp_log(const struct audit_ntp_data *ad)
+{
+	audit_log_ntp_val(ad, "offset",	AUDIT_NTP_OFFSET);
+	audit_log_ntp_val(ad, "freq",	AUDIT_NTP_FREQ);
+	audit_log_ntp_val(ad, "status",	AUDIT_NTP_STATUS);
+	audit_log_ntp_val(ad, "tai",	AUDIT_NTP_TAI);
+	audit_log_ntp_val(ad, "tick",	AUDIT_NTP_TICK);
+	audit_log_ntp_val(ad, "adjust",	AUDIT_NTP_ADJUST);
+}
+
 static void audit_log_task(struct audit_buffer *ab)
 {
 	kuid_t auid, uid;
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 92a90014a925..ac5555e25733 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -17,6 +17,7 @@
 #include <linux/mm.h>
 #include <linux/module.h>
 #include <linux/rtc.h>
+#include <linux/audit.h>
 
 #include "ntp_internal.h"
 #include "timekeeping_internal.h"
@@ -709,7 +710,7 @@ static inline void process_adjtimex_modes(const struct __kernel_timex *txc,
  * kernel time-keeping variables. used by xntpd.
  */
 int __do_adjtimex(struct __kernel_timex *txc, const struct timespec64 *ts,
-		  s32 *time_tai)
+		  s32 *time_tai, struct audit_ntp_data *ad)
 {
 	int result;
 
@@ -720,14 +721,29 @@ int __do_adjtimex(struct __kernel_timex *txc, const struct timespec64 *ts,
 			/* adjtime() is independent from ntp_adjtime() */
 			time_adjust = txc->offset;
 			ntp_update_frequency();
+
+			audit_ntp_set_old(ad, AUDIT_NTP_ADJUST,	save_adjust);
+			audit_ntp_set_new(ad, AUDIT_NTP_ADJUST,	time_adjust);
 		}
 		txc->offset = save_adjust;
 	} else {
-
 		/* If there are input parameters, then process them: */
-		if (txc->modes)
+		if (txc->modes) {
+			audit_ntp_set_old(ad, AUDIT_NTP_OFFSET,	time_offset);
+			audit_ntp_set_old(ad, AUDIT_NTP_FREQ,	time_freq);
+			audit_ntp_set_old(ad, AUDIT_NTP_STATUS,	time_status);
+			audit_ntp_set_old(ad, AUDIT_NTP_TAI,	*time_tai);
+			audit_ntp_set_old(ad, AUDIT_NTP_TICK,	tick_usec);
+
 			process_adjtimex_modes(txc, time_tai);
 
+			audit_ntp_set_new(ad, AUDIT_NTP_OFFSET,	time_offset);
+			audit_ntp_set_new(ad, AUDIT_NTP_FREQ,	time_freq);
+			audit_ntp_set_new(ad, AUDIT_NTP_STATUS,	time_status);
+			audit_ntp_set_new(ad, AUDIT_NTP_TAI,	*time_tai);
+			audit_ntp_set_new(ad, AUDIT_NTP_TICK,	tick_usec);
+		}
+
 		txc->offset = shift_right(time_offset * NTP_INTERVAL_FREQ,
 				  NTP_SCALE_SHIFT);
 		if (!(time_status & STA_NANO))
diff --git a/kernel/time/ntp_internal.h b/kernel/time/ntp_internal.h
index 40e6122e634e..908ecaa65fc3 100644
--- a/kernel/time/ntp_internal.h
+++ b/kernel/time/ntp_internal.h
@@ -8,6 +8,8 @@ extern void ntp_clear(void);
 extern u64 ntp_tick_length(void);
 extern ktime_t ntp_get_next_leap(void);
 extern int second_overflow(time64_t secs);
-extern int __do_adjtimex(struct __kernel_timex *txc, const struct timespec64 *ts, s32 *time_tai);
+extern int __do_adjtimex(struct __kernel_timex *txc,
+			 const struct timespec64 *ts,
+			 s32 *time_tai, struct audit_ntp_data *ad);
 extern void __hardpps(const struct timespec64 *phase_ts, const struct timespec64 *raw_ts);
 #endif /* _LINUX_NTP_INTERNAL_H */
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 3d24be4cd607..f366f2fdf1b0 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -2307,6 +2307,7 @@ static int timekeeping_validate_timex(const struct __kernel_timex *txc)
 int do_adjtimex(struct __kernel_timex *txc)
 {
 	struct timekeeper *tk = &tk_core.timekeeper;
+	struct audit_ntp_data ad;
 	unsigned long flags;
 	struct timespec64 ts;
 	s32 orig_tai, tai;
@@ -2330,13 +2331,15 @@ int do_adjtimex(struct __kernel_timex *txc)
 		audit_tk_injoffset(delta);
 	}
 
+	audit_ntp_init(&ad);
+
 	ktime_get_real_ts64(&ts);
 
 	raw_spin_lock_irqsave(&timekeeper_lock, flags);
 	write_seqcount_begin(&tk_core.seq);
 
 	orig_tai = tai = tk->tai_offset;
-	ret = __do_adjtimex(txc, &ts, &tai);
+	ret = __do_adjtimex(txc, &ts, &tai, &ad);
 
 	if (tai != orig_tai) {
 		__timekeeping_set_tai_offset(tk, tai);
@@ -2347,6 +2350,8 @@ int do_adjtimex(struct __kernel_timex *txc)
 	write_seqcount_end(&tk_core.seq);
 	raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
 
+	audit_ntp_log(&ad);
+
 	/* Update the multiplier immediately if frequency was set directly */
 	if (txc->modes & (ADJ_FREQUENCY | ADJ_TICK))
 		timekeeping_advance(TK_ADV_FREQ);