Message-ID: <2029938.2WYqZXpe8D@x2>
Date:   Fri, 08 Mar 2019 12:59:19 -0500
From:   Steve Grubb <sgrubb@...hat.com>
To:     Ondrej Mosnacek <omosnace@...hat.com>
Cc:     linux-audit@...hat.com, Paul Moore <paul@...l-moore.com>,
        Richard Guy Briggs <rgb@...hat.com>,
        Miroslav Lichvar <mlichvar@...hat.com>,
        John Stultz <john.stultz@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Stephen Boyd <sboyd@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH ghak10 v6 2/2] ntp: Audit NTP parameters adjustment

On Thursday, March 7, 2019 7:32:54 AM EST Ondrej Mosnacek wrote:
> Emit an audit record every time selected NTP parameters are modified
> from userspace (via adjtimex(2) or clock_adjtime(2)).
> 
> 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
> 
> For reference, running the following commands:
> 
>     auditctl -D
>     auditctl -a exit,always -F arch=b64 -S adjtimex
>     chronyd -q
> 
> produces audit records like this:
> 
> type=SYSCALL msg=audit(1530616044.507:5): arch=c000003e syscall=159
> success=yes exit=5 a0=7fff57e78c00 a1=0 a2=4 a3=7f754ae28c0a items=0
> ppid=626 pid=629 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0
> fsgid=0 tty=(none) ses=1 comm="chronyd" exe="/usr/sbin/chronyd"
> subj=system_u:system_r:kernel_t:s0 key=(null) type=PROCTITLE
> msg=audit(1530616044.507:5): proctitle=6368726F6E7964002D71 type=SYSCALL
> msg=audit(1530616044.507:6): arch=c000003e syscall=159 success=yes exit=5
> a0=7fff57e78c00 a1=1 a2=1 a3=7f754ae28c0a items=0 ppid=626 pid=629 auid=0
> uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=1
> comm="chronyd" exe="/usr/sbin/chronyd" subj=system_u:system_r:kernel_t:s0
> key=(null) type=PROCTITLE msg=audit(1530616044.507:6):
> proctitle=6368726F6E7964002D71 type=TIME_ADJNTPVAL
> msg=audit(1530616044.507:7): op=status old=64 new=8256 type=SYSCALL
> msg=audit(1530616044.507:7): arch=c000003e syscall=159 success=yes exit=5
> a0=7fff57e78c00 a1=1 a2=1 a3=7f754ae28c0a items=0 ppid=626 pid=629 auid=0
> uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=1
> comm="chronyd" exe="/usr/sbin/chronyd" subj=system_u:system_r:kernel_t:s0
> key=(null) type=PROCTITLE msg=audit(1530616044.507:7):
> proctitle=6368726F6E7964002D71 type=TIME_ADJNTPVAL
> msg=audit(1530616044.507:8): op=status old=8256 new=8257 type=SYSCALL
> msg=audit(1530616044.507:8): arch=c000003e syscall=159 success=yes exit=5
> a0=7fff57e78ab0 a1=0 a2=55e129c850c0 a3=7f754ae28c0a items=0 ppid=626
> pid=629 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0
> tty=(none) ses=1 comm="chronyd" exe="/usr/sbin/chronyd"
> subj=system_u:system_r:kernel_t:s0 key=(null) type=PROCTITLE
> msg=audit(1530616044.507:8): proctitle=6368726F6E7964002D71
> type=TIME_ADJNTPVAL msg=audit(1530616044.507:9): op=status old=8257 new=64
> type=SYSCALL msg=audit(1530616044.507:9): arch=c000003e syscall=159
> success=yes exit=5 a0=7fff57e78ab0 a1=0 a2=55e129c850c0 a3=7f754ae28c0a
> items=0 ppid=626 pid=629 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0
> sgid=0 fsgid=0 tty=(none) ses=1 comm="chronyd" exe="/usr/sbin/chronyd"
> subj=system_u:system_r:kernel_t:s0 key=(null) type=PROCTITLE
> msg=audit(1530616044.507:9): proctitle=6368726F6E7964002D71 type=SYSCALL
> msg=audit(1530616044.507:10): arch=c000003e syscall=159 success=yes exit=5
> a0=7fff57e78a70 a1=0 a2=55e129c850c0 a3=7f754ae28c0a items=0 ppid=626
> pid=629 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0
> tty=(none) ses=1 comm="chronyd" exe="/usr/sbin/chronyd"
> subj=system_u:system_r:kernel_t:s0 key=(null) type=PROCTITLE
> msg=audit(1530616044.507:10): proctitle=6368726F6E7964002D71
> type=TIME_ADJNTPVAL msg=audit(1530616044.511:11): op=freq old=0
> new=49180377088000 type=SYSCALL msg=audit(1530616044.511:11):
> arch=c000003e syscall=159 success=yes exit=5 a0=7fff57e78ad0 a1=0 a2=2710
> a3=f42f82a800000 items=0 ppid=626 pid=629 auid=0 uid=385 gid=382 euid=385
> suid=385 fsuid=385 egid=382 sgid=382 fsgid=382 tty=(none) ses=1
> comm="chronyd" exe="/usr/sbin/chronyd" subj=system_u:system_r:kernel_t:s0
> key=(null) type=PROCTITLE msg=audit(1530616044.511:11):
> proctitle=6368726F6E7964002D71 type=SYSCALL msg=audit(1530616044.521:12):
> arch=c000003e syscall=159 success=yes exit=5 a0=7fff57e78b40 a1=1 a2=40
> a3=f91f6ef84fbab items=0 ppid=626 pid=629 auid=0 uid=385 gid=382 euid=385
> suid=385 fsuid=385 egid=382 sgid=382 fsgid=382 tty=(none) ses=1
> comm="chronyd" exe="/usr/sbin/chronyd" subj=system_u:system_r:kernel_t:s0
> key=(null) type=PROCTITLE msg=audit(1530616044.521:12):
> proctitle=6368726F6E7964002D71 type=TIME_ADJNTPVAL
> msg=audit(1530616049.652:13): op=status old=64 new=8256 type=SYSCALL
> msg=audit(1530616049.652:13): arch=c000003e syscall=159 success=yes exit=5
> a0=7fff57e78270 a1=1 a2=fffffffffffffff0 a3=137b828205ca12 items=0
> ppid=626 pid=629 auid=0 uid=385 gid=382 euid=385 suid=385 fsuid=385
> egid=382 sgid=382 fsgid=382 tty=(none) ses=1 comm="chronyd"
> exe="/usr/sbin/chronyd" subj=system_u:system_r:kernel_t:s0 key=(null)
> type=PROCTITLE msg=audit(1530616049.652:13):
> proctitle=6368726F6E7964002D71 type=SYSCALL msg=audit(1530616033.783:14):
> arch=c000003e syscall=159 success=yes exit=5 a0=7fff57e78bc0 a1=0 a2=2710
> a3=0 items=0 ppid=626 pid=629 auid=0 uid=385 gid=382 euid=385 suid=385
> fsuid=385 egid=382 sgid=382 fsgid=382 tty=(none) ses=1 comm="chronyd"
> exe="/usr/sbin/chronyd" subj=system_u:system_r:kernel_t:s0 key=(null)
> type=PROCTITLE msg=audit(1530616033.783:14):
> proctitle=6368726F6E7964002D71
> 
> The chronyd command that produced the above records executed the
> following adjtimex(2) syscalls (as per strace output):
> 
> adjtimex({modes=ADJ_OFFSET|0x8000, offset=0, freq=0, maxerror=16000000,
> esterror=16000000, status=STA_UNSYNC, constant=2, precision=1,
> tolerance=32768000, time={tv_sec=1530616044, tv_usec=507215}, tick=10000,
> ppsfreq=0, jitter=0, shift=0, stabil=0, jitcnt=0, calcnt=0, errcnt=0,
> stbcnt=0, tai=0}) = 5 (TIME_ERROR) adjtimex({modes=ADJ_MAXERROR, offset=0,
> freq=0, maxerror=0, esterror=16000000, status=STA_UNSYNC, constant=2,
> precision=1, tolerance=32768000, time={tv_sec=1530616044, tv_usec=507438},
> tick=10000, ppsfreq=0, jitter=0, shift=0, stabil=0, jitcnt=0, calcnt=0,
> errcnt=0, stbcnt=0, tai=0}) = 5 (TIME_ERROR)
> adjtimex({modes=ADJ_SETOFFSET|ADJ_NANO, offset=0, freq=0,
> maxerror=16000000, esterror=16000000, status=STA_UNSYNC|STA_NANO,
> constant=2, precision=1, tolerance=32768000, time={tv_sec=1530616044,
> tv_usec=507604737}, tick=10000, ppsfreq=0, jitter=0, shift=0, stabil=0,
> jitcnt=0, calcnt=0, errcnt=0, stbcnt=0, tai=0}) = 5 (TIME_ERROR)
> adjtimex({modes=ADJ_OFFSET|ADJ_STATUS, offset=0, freq=0,
> maxerror=16000000, esterror=16000000, status=STA_PLL|STA_UNSYNC|STA_NANO,
> constant=2, precision=1, tolerance=32768000, time={tv_sec=1530616044,
> tv_usec=507698330}, tick=10000, ppsfreq=0, jitter=0, shift=0, stabil=0,
> jitcnt=0, calcnt=0, errcnt=0, stbcnt=0, tai=0}) = 5 (TIME_ERROR)
> adjtimex({modes=ADJ_STATUS, offset=0, freq=0, maxerror=16000000,
> esterror=16000000, status=STA_UNSYNC, constant=2, precision=1,
> tolerance=32768000, time={tv_sec=1530616044, tv_usec=507792}, tick=10000,
> ppsfreq=0, jitter=0, shift=0, stabil=0, jitcnt=0, calcnt=0, errcnt=0,
> stbcnt=0, tai=0}) = 5 (TIME_ERROR) adjtimex({modes=0, offset=0, freq=0,
> maxerror=16000000, esterror=16000000, status=STA_UNSYNC, constant=2,
> precision=1, tolerance=32768000, time={tv_sec=1530616044, tv_usec=508000},
> tick=10000, ppsfreq=0, jitter=0, shift=0, stabil=0, jitcnt=0, calcnt=0,
> errcnt=0, stbcnt=0, tai=0}) = 5 (TIME_ERROR)
> adjtimex({modes=ADJ_FREQUENCY|ADJ_TICK, offset=0, freq=750433,
> maxerror=16000000, esterror=16000000, status=STA_UNSYNC, constant=2,
> precision=1, tolerance=32768000, time={tv_sec=1530616044, tv_usec=512146},
> tick=10000, ppsfreq=0, jitter=0, shift=0, stabil=0, jitcnt=0, calcnt=0,
> errcnt=0, stbcnt=0, tai=0}) = 5 (TIME_ERROR)
> adjtimex({modes=ADJ_MAXERROR|ADJ_ESTERROR|ADJ_STATUS, offset=0,
> freq=750433, maxerror=16000000, esterror=16000000, status=STA_UNSYNC,
> constant=2, precision=1, tolerance=32768000, time={tv_sec=1530616044,
> tv_usec=522506}, tick=10000, ppsfreq=0, jitter=0, shift=0, stabil=0,
> jitcnt=0, calcnt=0, errcnt=0, stbcnt=0, tai=0}) = 5 (TIME_ERROR)
> adjtimex({modes=ADJ_SETOFFSET|ADJ_NANO, offset=0, freq=750433,
> maxerror=16000000, esterror=16000000, status=STA_UNSYNC|STA_NANO,
> constant=2, precision=1, tolerance=32768000, time={tv_sec=1530616033,
> tv_usec=778717675}, tick=10000, ppsfreq=0, jitter=0, shift=0, stabil=0,
> jitcnt=0, calcnt=0, errcnt=0, stbcnt=0, tai=0}) = 5 (TIME_ERROR)
> adjtimex({modes=ADJ_FREQUENCY|ADJ_TICK, offset=0, freq=750433,
> maxerror=16000000, esterror=16000000, status=STA_UNSYNC|STA_NANO,
> constant=2, precision=1, tolerance=32768000, time={tv_sec=1530616033,
> tv_usec=784644657}, tick=10000, ppsfreq=0, jitter=0, shift=0, stabil=0,
> jitcnt=0, calcnt=0, errcnt=0, stbcnt=0, tai=0}) = 5 (TIME_ERROR)

This is needed for common criteria. Requirements are getting stricter in 
certifications of IT products that are time stamp sensitive. The new record 
format looks fine to me.

Ack for the record format.

-Steve

> (The struct timex fields above are from *after* the syscall was
> executed, so they contain the current (new) values as set from the
> kernel, except of the 'modes' field, which contains the original value
> sent by the caller.)
> 
> The changes to the time_maxerror, time_esterror, and time_constant
> variables are not logged, as these are not important for security. Also,
> no-op adjustments that do not actually change the value are not logged.
> 
> 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%
>     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@...hat.com>
> ---
>  include/linux/audit.h      | 14 ++++++++++++++
>  include/uapi/linux/audit.h |  1 +
>  kernel/auditsc.c           |  7 +++++++
>  kernel/time/ntp.c          | 38 ++++++++++++++++++++++++++++++--------
>  4 files changed, 52 insertions(+), 8 deletions(-)
> 
> diff --git a/include/linux/audit.h b/include/linux/audit.h
> index 43a60fbe74be..0f67964544cc 100644
> --- a/include/linux/audit.h
> +++ b/include/linux/audit.h
> @@ -367,6 +367,7 @@ extern void __audit_mmap_fd(int fd, int flags);
>  extern void __audit_log_kern_module(char *name);
>  extern void __audit_fanotify(unsigned int response);
>  extern void __audit_tk_injoffset(struct timespec64 offset);
> +extern void __audit_ntp_adjust(const char *type, s64 oldval, s64 newval);
> 
>  static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
>  {
> @@ -479,6 +480,16 @@ static inline void audit_tk_injoffset(struct
> timespec64 offset) __audit_tk_injoffset(offset);
>  }
> 
> +static inline void audit_ntp_adjust(const char *type, s64 oldval, s64
> newval) +{
> +	/* ignore no-op events */
> +	if (newval == oldval)
> +		return;
> +
> +	if (!audit_dummy_context())
> +		__audit_ntp_adjust(type, oldval, newval);
> +}
> +
>  extern int audit_n_rules;
>  extern int audit_signals;
>  #else /* CONFIG_AUDITSYSCALL */
> @@ -595,6 +606,9 @@ static inline void audit_fanotify(unsigned int
> response) static inline void audit_tk_injoffset(struct timespec64 offset)
>  { }
> 
> +static inline void audit_ntp_adjust(const char *type, s64 oldval, s64
> newval) +{ }
> +
>  static inline void audit_ptrace(struct task_struct *t)
>  { }
>  #define audit_n_rules 0
> diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h
> index 2167d55bc800..e9781f0385eb 100644
> --- a/include/uapi/linux/audit.h
> +++ b/include/uapi/linux/audit.h
> @@ -115,6 +115,7 @@
>  #define AUDIT_KERN_MODULE	1330	/* Kernel Module events */
>  #define AUDIT_FANOTIFY		1331	/* Fanotify access decision */
>  #define AUDIT_TIME_INJOFFSET	1332	/* Timekeeping offset injected */
> +#define AUDIT_TIME_ADJNTPVAL	1333	/* NTP value adjustment */
> 
>  #define AUDIT_AVC		1400	/* SE Linux avc denial or grant */
>  #define AUDIT_SELINUX_ERR	1401	/* Internal SE Linux Errors */
> diff --git a/kernel/auditsc.c b/kernel/auditsc.c
> index 781336d0f2de..946806174cd9 100644
> --- a/kernel/auditsc.c
> +++ b/kernel/auditsc.c
> @@ -2520,6 +2520,13 @@ void __audit_tk_injoffset(struct timespec64 offset)
>  		  "sec=%lli nsec=%li", (long long)offset.tv_sec, 
offset.tv_nsec);
>  }
> 
> +void __audit_ntp_adjust(const char *type, s64 oldval, s64 newval)
> +{
> +	audit_log(audit_context(), GFP_ATOMIC, AUDIT_TIME_ADJNTPVAL,
> +		  "op=%s old=%lli new=%lli", type,
> +		  (long long)oldval, (long long)newval);
> +}
> +
>  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 36a2bef00125..5f456a84151a 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"
> @@ -293,6 +294,8 @@ static inline s64 ntp_update_offset_fll(s64 offset64,
> long secs)
> 
>  static void ntp_update_offset(long offset)
>  {
> +	s64 old_offset = time_offset;
> +	s64 old_freq = time_freq;
>  	s64 freq_adj;
>  	s64 offset64;
>  	long secs;
> @@ -341,6 +344,9 @@ static void ntp_update_offset(long offset)
>  	time_freq   = max(freq_adj, -MAXFREQ_SCALED);
> 
>  	time_offset = div_s64(offset64 << NTP_SCALE_SHIFT, NTP_INTERVAL_FREQ);
> +
> +	audit_ntp_adjust("offset", old_offset, time_offset);
> +	audit_ntp_adjust("freq", old_freq, time_freq);
>  }
> 
>  /**
> @@ -658,21 +664,31 @@ static inline void process_adj_status(const struct
> timex *txc)
> 
>  static inline void process_adjtimex_modes(const struct timex *txc, s32
> *time_tai) {
> -	if (txc->modes & ADJ_STATUS)
> -		process_adj_status(txc);
> +	if (txc->modes & (ADJ_STATUS | ADJ_NANO | ADJ_MICRO)) {
> +		int old_status = time_status;
> +
> +		if (txc->modes & ADJ_STATUS)
> +			process_adj_status(txc);
> 
> -	if (txc->modes & ADJ_NANO)
> -		time_status |= STA_NANO;
> +		if (txc->modes & ADJ_NANO)
> +			time_status |= STA_NANO;
> 
> -	if (txc->modes & ADJ_MICRO)
> -		time_status &= ~STA_NANO;
> +		if (txc->modes & ADJ_MICRO)
> +			time_status &= ~STA_NANO;
> +
> +		audit_ntp_adjust("status", old_status, time_status);
> +	}
> 
>  	if (txc->modes & ADJ_FREQUENCY) {
> +		s64 old_freq = time_freq;
> +
>  		time_freq = txc->freq * PPM_SCALE;
>  		time_freq = min(time_freq, MAXFREQ_SCALED);
>  		time_freq = max(time_freq, -MAXFREQ_SCALED);
>  		/* update pps_freq */
>  		pps_set_freq(time_freq);
> +
> +		audit_ntp_adjust("freq", old_freq, time_freq);
>  	}
> 
>  	if (txc->modes & ADJ_MAXERROR)
> @@ -689,14 +705,18 @@ static inline void process_adjtimex_modes(const
> struct timex *txc, s32 *time_tai time_constant = max(time_constant, 0l);
>  	}
> 
> -	if (txc->modes & ADJ_TAI && txc->constant > 0)
> +	if (txc->modes & ADJ_TAI && txc->constant > 0) {
> +		audit_ntp_adjust("tai", *time_tai, txc->constant);
>  		*time_tai = txc->constant;
> +	}
> 
>  	if (txc->modes & ADJ_OFFSET)
>  		ntp_update_offset(txc->offset);
> 
> -	if (txc->modes & ADJ_TICK)
> +	if (txc->modes & ADJ_TICK) {
> +		audit_ntp_adjust("tick", tick_usec, txc->tick);
>  		tick_usec = txc->tick;
> +	}
> 
>  	if (txc->modes & (ADJ_TICK|ADJ_FREQUENCY|ADJ_OFFSET))
>  		ntp_update_frequency();
> @@ -718,6 +738,8 @@ int __do_adjtimex(struct timex *txc, const struct
> timespec64 *ts, s32 *time_tai) /* adjtime() is independent from
> ntp_adjtime() */
>  			time_adjust = txc->offset;
>  			ntp_update_frequency();
> +
> +			audit_ntp_adjust("adjust", save_adjust, txc->offset);
>  		}
>  		txc->offset = save_adjust;
>  	} else {

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