[Bug 997269] Re: dovecot imap broken by apparmor policy

[Janne Snabb]

apport information

** Tags added: apport-collected

** Description changed:

  Syslog output:
  
  Apr 29 10:59:06 host12 dovecot: imap(foobar): Error: fcntl(unlock) locking failed for file /home/foobar/Maildir/dovecot.index.log: No such file or directory
  Apr 29 10:59:06 host12 dovecot: imap(foobar): Error: fstat() failed with file /home/foobar/Maildir/dovecot.index.log: No such file or directory
  Apr 29 10:59:37  dovecot: last message repeated 122 times
  Apr 29 11:00:38  dovecot: last message repeated 248 times
  Apr 29 11:01:54  dovecot: last message repeated 203 times
  
  audit.log, lots of entries similar to the following:
  
  type=AVC msg=audit(1335712674.515:655016): apparmor="ALLOWED"
  operation="getattr" parent=10922 profile="/usr/sbin/dovecot//null-107
  //null-10b//null-118"
  name="/home/foobar/Maildir/.foobar/dovecot.index.log" pid=10937
  comm="imap" requested_mask="r" denied_mask="r" fsuid=1000 ouid=1000
  
  The apparmor policy is as shipped with 12.04. The strange thing here is
  that audit.log says that the access was allowed and the apparmor policy
  has "flags=(complain)", but the imap server still fails accessing some
  files in the Maildir folders.
  
  Workaround:
  
  # ln -s /etc/apparmor.d/usr.sbin.dovecot /etc/apparmor.d/disable/
  
  After disabling the usr.sbin.dovecot apparmor policy everything works
  fine. There is no need to disable the "usr.lib.dovecot.imap" policy.
  
  It looks like the imap process is incorrectly running under the dovecot
  main daemon's apparmor profile. And for some odd reason the profile is
  enforcing things even though it should be in "complain" mode. What are
  these "//null-NNN/" strings in the logged apparmor profile name? I do
  not know apparmor well enough to debug this further at this point.
  
  Someone else has encountered this also, see thread at:
  
  http://comments.gmane.org/gmane.mail.imap.dovecot/60533
  
  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: dovecot-imapd 1:2.0.19-0ubuntu1
  ProcVersionSignature: User Name 3.2.0-24.37-virtual 3.2.14
  Uname: Linux 3.2.0-24-virtual x86_64
  ApportVersion: 2.0.1-0ubuntu7
  Architecture: amd64
  Date: Wed May  9 18:36:11 2012
  ProcEnviron:
   SHELL=/bin/bash
   TERM=screen
   LANG=en_US.UTF-8
  SourcePackage: dovecot
  UpgradeStatus: Upgraded to precise on 2012-04-27 (12 days ago)
+ --- 
+ ApportVersion: 2.0.1-0ubuntu8
+ Architecture: amd64
+ DistroRelease: Ubuntu 12.04
+ InstallationMedia: Ubuntu-Server 12.04 LTS "Precise Pangolin" - Release amd64 (20120424.1)
+ Package: apparmor 2.7.102-0ubuntu3.1
+ PackageArchitecture: amd64
+ ProcEnviron:
+  TERM=linux
+  PATH=(custom, no user)
+  LANG=en_US.UTF-8
+  SHELL=/bin/bash
+ ProcKernelCmdline: BOOT_IMAGE=/boot/vmlinuz-3.2.0-23-generic root=UUID=7e6df5b7-d31e-4757-a388-f4f477187a63 ro
+ ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
+ Tags:  precise
+ Uname: Linux 3.2.0-23-generic x86_64
+ UpgradeStatus: No upgrade log present (probably fresh install)
+ UserGroups:

** Attachment added: "ApparmorPackages.txt"
   https://bugs.launchpad.net/bugs/997269/+attachment/3216655/+files/ApparmorPackages.txt

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https://bugs.launchpad.net/bugs/997269

Title:
  dovecot imap broken by apparmor policy

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