** Description changed:
The apparmor parser supports 'include' and '#include' rules for
specifying absolute paths, but the python tools only understand include
rules for so called 'magic' '<>' file locations.
- Reproducer:
-
+
+ = test case #1 (aa-enforce) =
$ mkdir /tmp/test1 /tmp/test2
$ cat /etc/apparmor.d/lp1733700
profile lp1733700 {
- #include "/tmp/test1"
- include "/tmp/test2"
+ #include "/tmp/test1"
+ include "/tmp/test2"
}
$ apparmor_parser -QTK /etc/apparmor.d/lp1733700 && echo ok
- $ sudo aa-enforce /etc/apparmor.d/lp1733700
-
- ERROR: Syntax Error: Missing '}' or ','. Reached end of file
- /etc/apparmor.d/lp1733700 while inside profile lp1733700.
+ $ sudo aa-enforce /etc/apparmor.d/lp1733700 # currently fails
+
+
+ = test case #2 (aa-genprof) =
+
+ This assumes test case #1 was already performed and
+ /etc/apparmor.d/lp1733700 exists with the above includes.
+
+ $ cat /tmp/lp1733700
+ #!/bin/sh
+ set -e
+ sh -c "$@"
+
+ # run without confinement:
+ $ /tmp/lp1733700 'cat /etc/fstab' | head -1
+ # /etc/fstab: static file system information.
+
+ # invoke genprof
+ $ sudo aa-genprof /tmp/lp1733700
+ ...
+ [(S)can system log for AppArmor events] / (F)inish - PRESS 's' - currently
fails
+ ... don't exercise the application any so we just have the default profile ...
+ [(S)can system log for AppArmor events] / (F)inish - PRESS 'f'
+ ...
+ Finished generating profile for /tmp/lp1733700.
+
+ $ sudo cat /etc/apparmor.d/tmp.lp1733700
+ # Last Modified: Wed Dec 20 15:53:07 2017
+ #include <tunables/global>
+
+ /tmp/lp1733700 {
+ #include <abstractions/base>
+ #include <abstractions/bash>
+
+ /bin/dash ix,
+ /lib/x86_64-linux-gnu/ld-*.so mr,
+ /tmp/lp1733700 r,
+
+ }
+
+
+ = test case #3 (aa-logprof) =
+
+ This assumes test case #1 was already performed and
+ /etc/apparmor.d/lp1733700 exists with the above includes.
+
+ This also assumes test case #2 was already performed and
+ /etc/apparmor.d/tmp.lp1733700 exists.
+
+ Disable kernel rate limiting:
+ $ sudo sysctl -w kernel.printk_ratelimit=0
+
+ Create mark entry in syslog:
+ $ logger mark-lp1733700
+
+ Try running logprof with no new denials:
+
+ $ sudo aa-logprof -m mark-lp1733700 # currently fails
+ Reading log entries from /var/log/syslog.
+ Updating AppArmor profiles in /etc/apparmor.d.
+ $
+
+ Adjust /etc/apparmor.d/tmp.lp1733700 to add:
+
+ #include "/tmp/test1"
+ include "/tmp/test2"
+
+ Load it into the kernel:
+ $ sudo apparmor_parser -r /etc/apparmor.d/tmp.lp1733700
+
+ Create a new denial:
+ $ /tmp/lp1733700 'uptime'
+ sh: 1: uptime: Permission denied
+ $
+
+ Try running logprof:
+
+ $ sudo aa-logprof -m mark-lp1733700 # currently fails
+ Reading log entries from /var/log/syslog.
+ Updating AppArmor profiles in /etc/apparmor.d.
+
+ Profile: /tmp/lp1733700
+ Execute: /usr/bin/uptime
+ Severity: unknown
+
+ (I)nherit / (C)hild / (N)amed / (X) ix On / (D)eny / Abo(r)t / (F)inish
+ ...
+ The following local profiles were changed. Would you like to save them?
+ <PRESS 'i'>
+ [1 - /tmp/lp1733700]
+ (S)ave Changes / Save Selec(t)ed Profile / [(V)iew Changes] / View Changes
b/w (C)lean profiles / Abo(r)t
+ <PRESS 's'>
+
+ Writing updated profile for /tmp/lp1733700.
+ $
+
+ Verify the profile for 'uptime' addition and that the /tmp/test1 and
+ /tmp/test2 includes were not removed (it is ok that they are both
+ '#include'):
+
+ $ sudo cat /etc/apparmor.d/tmp.lp1733700
+ # Last Modified: Wed Dec 20 16:19:19 2017
+ #include <tunables/global>
+
+ /tmp/lp1733700 {
+ #include "/tmp/test1"
+ #include "/tmp/test2"
+ #include <abstractions/base>
+ #include <abstractions/bash>
+
+ /bin/dash ix,
+ /lib/x86_64-linux-gnu/ld-*.so mr,
+ /tmp/lp1733700 r,
+ /usr/bin/uptime mrix,
+
+ }
+
+
+ = test case #4 (aa-mergeprof) =
+
+ $ mkdir -p /tmp/aa-mergeprof/new
+ $ mkdir /tmp/aa-mergeprof/new/tunables /tmp/aa-mergeprof/new/abstractions
+ $ touch /tmp/aa-mergeprof/new/tunables/global
/tmp/aa-mergeprof/new/abstractions/base /tmp/aa-mergeprof/new/abstractions/bash
+ $ cp -a /tmp/aa-mergeprof/new /tmp/aa-mergeprof/old
+
+ $ cat /tmp/aa-mergeprof/old/tmp.lp1733700 # no test2 include or cat
+ #include <tunables/global>
+
+ /tmp/lp1733700 {
+ #include <abstractions/base>
+ #include <abstractions/bash>
+ #include "/tmp/test1"
+
+ /bin/dash ix,
+ /lib/x86_64-linux-gnu/ld-*.so mr,
+ /tmp/lp1733700 r,
+ /usr/bin/uptime mrix,
+
+ }
+
+ $ cat /tmp/aa-mergeprof/new/tmp.lp1733700 # no test1 include or uptime
+ #include <tunables/global>
+
+ /tmp/lp1733700 {
+ #include <abstractions/base>
+ #include <abstractions/bash>
+ #include "/tmp/test2"
+
+ /bin/dash ix,
+ /lib/x86_64-linux-gnu/ld-*.so mr,
+ /tmp/lp1733700 r,
+ /bin/cat ixr,
+
+ }
+
+ $ sudo aa-mergeprof -d /tmp/aa-mergeprof/new
/tmp/aa-mergeprof/old/tmp.lp1733700
+ ...
+ [1 - #include "/tmp/test1"]
+ [(A)llow] / (I)gnore / Abo(r)t / (F)inish
+ <PRESS 'a'>
+ ...
+ [1 - /usr/bin/uptime mrix,]
+ (A)llow / [(D)eny] / (I)gnore / (G)lob / Glob with (E)xtension / (N)ew /
Audi(t) / Abo(r)t / (F)inish
+ <PRESS 'a'>
+ ...
+ The following local profiles were changed. Would you like to save them?
+
+ [1 - /tmp/lp1733700]
+ (S)ave Changes / [(V)iew Changes] / Abo(r)t / (I)gnore - PRESS 's'
+ Writing updated profile for /tmp/lp1733700.
+ $
+
+ Verify /tmp/aa-mergeprof/new/tmp.lp1733700 has test1, test2, cat and uptime
(old mergeprof would discard includes with absolute paths):
+ $ cat /tmp/aa-mergeprof/new/tmp.lp1733700
+ # Last Modified: Wed Dec 20 17:16:34 2017
+ #include <tunables/global>
+
+ /tmp/lp1733700 {
+ #include "/tmp/test1"
+ #include "/tmp/test2"
+ #include <abstractions/base>
+ #include <abstractions/bash>
+
+ /bin/cat rix,
+ /bin/dash ix,
+ /lib/x86_64-linux-gnu/ld-*.so mr,
+ /tmp/lp1733700 r,
+ /usr/bin/uptime mrix,
+
+ }
+
Note that the original description said that changing the rule from
'include' to '#include' fixed the issue when in reality it only allowed
the rule to parse as a comment instead of erroring.
= Original description =
The apparmor_parser now supports 'include' rules in addition to '#include',
but the python tools only understand '#include'. This manifested itself in
Ubuntu in bug #1734038 (see
https://bugs.launchpad.net/ubuntu/+source/snapd/+bug/1734038/comments/15 of
that bug for details).
Reproducer:
$ mkdir /tmp/test
$ cat /etc/apparmor.d/lp1733700
profile lp1733700 {
include "/tmp/test"
}
$ apparmor_parser -QTK /etc/apparmor.d/lp1733700 && echo ok
ok
$ sudo aa-enforce /etc/apparmor.d/lp1733700
ERROR: Syntax Error: Missing '}' or ','. Reached end of file
/etc/apparmor.d/lp1733700 while inside profile lp1733700
Changing the 'include' to '#include' results in:
$ sudo aa-enforce /etc/apparmor.d/lp1733700
Setting /etc/apparmor.d/lp1733700 to enforce mode.
At least aa-logprof is also affected.
= Original report =
On Ubuntu artful, I'm seeing the following behavior:
$ aa-enforce usr.bin.chromium-browser
ERROR: Syntax Error: Unknown line found in file
/etc/apparmor.d/snap.core.3440.usr.lib.snapd.snap-confine line 15:
include "/var/lib/snapd/apparmor/snap-confine.d" /etc/ld.so.cache r,
I have never touched snap.core.3440.usr.lib.snapd.snap-confine.
This is snapd 2.28.5+17.10.
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https://bugs.launchpad.net/bugs/1733700
Title:
python tools do not understand 'non-magic' include rules
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