Public bug reported:
Hi
In the last days, weeks I've noticed that running netstat(8) utility via
sudo(8) is responsible for many entries in various log files, such as
/var/log/kern.log or /var/log/syslog. I'm using this profile [1]. There
are many DENIED messages but not related with, for example, lack of some
rule etc. It looks this way; run i.e. `sudo netstat -talpn/tulpn`
command and check log files - there are such entries:
* /var/log/kern.log file:
Nov 30 19:12:15 t4 kernel: [12380.946835] type=1400
audit(1480529535.149:812): apparmor="DENIED" operation="ptrace" parent=5014
profile="/bin/netstat" pid=5015 comm="netstat" target=B00280F4B00280F42701
Nov 30 19:12:15 t4 kernel: [12380.946850] type=1400
audit(1480529535.149:813): apparmor="DENIED" operation="ptrace" parent=5014
profile="/bin/netstat" pid=5015 comm="netstat" target=B00280F4B00280F42701
Nov 30 19:12:15 t4 kernel: [12380.946859] type=1400
audit(1480529535.149:814): apparmor="DENIED" operation="ptrace" parent=5014
profile="/bin/netstat" pid=5015 comm="netstat" target=B00280F4B00280F42701
Dec 6 15:27:11 t4 kernel: [ 816.591037] type=1400
audit(1481034431.811:45): apparmor="DENIED" operation="ptrace" parent=17598
profile="/bin/netstat" pid=17599 comm="netstat" target=B00280F4B00280F44B01
Dec 6 15:27:11 t4 kernel: [ 816.591069] type=1400
audit(1481034431.811:46): apparmor="DENIED" operation="ptrace" parent=17598
profile="/bin/netstat" pid=17599 comm="netstat" target=B00280F4B00280F44B01
Dec 6 15:27:11 t4 kernel: [ 816.591086] type=1400
audit(1481034431.811:47): apparmor="DENIED" operation="ptrace" parent=17598
profile="/bin/netstat" pid=17599 comm="netstat" target=B00280F4B00280F44B01
There are, of course, much more such entries - about 80. maybe more. As
we can see the only one thing, which has changed, is "target=*" entry.
According to Mr Steve Beattie, who's reproduced above issue, "converting
the 'deny capability sys_ptrace,' to allowing the sys_ptrace capability
made the rejections go away, as well as allowed netstat's -p argument to
work. Attempts to add a ptrace rule instead did not succeed."
Also, I've noticed that running netstat(8) as a normal user (without
sudo(8) - just for a testing purposes), produced such entry in a log
files:
[~]$ netstat -ta / -tunl
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State
/proc/net/tcp: Permission denied
* /var/log/syslog file:
Dec 31 13:19:02 t4 kernel: [ 3734.255210] type=1400
audit(1483186742.483:604): apparmor="DENIED" operation="open"
parent=3210 profile="/bin/netstat" name="/proc/3293/net/tcp" pid=3293
comm="netstat" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
As we can see, there is only one DENIED message, but this time
netstat(8) was run without 'p' flag, which is responsible for above logs
with many target=* entries. So, does netstat(8) profile needs also a
rule related to DENIED /proc/*/net/tcp? Something like:
@{PROC}/[0-9]*/net/tcp r,
AppArmor ver: 2.7.102-0ubuntu3.10,
Description: Ubuntu 12.04.5 LTS,
Release: 12.04,
Kernel: 3.2.0-120.163-generic-pae (3.2.79).
Best regards.
______________
[1] https://github.com/Harvie/AppArmor-Profiles/blob/master/bin.netstat
** Affects: apparmor (Ubuntu)
Importance: Undecided
Status: New
** Tags: netstat profile ptrace target
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https://bugs.launchpad.net/bugs/1653347
Title:
[profile] netstat(8): ptrace and many DENIED messages (target=*).
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