/etc/apparmor.d/abstractions/ubuntu-helpers is in apparmor 2.7.102-0ubuntu3.11.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | # Lenient profile that is intended to be used when 'Ux' is desired but
# does not provide enough environment sanitizing. This effectively is an
# open profile that blacklists certain known dangerous files and also
# does not allow any capabilities. For example, it will not allow 'm' on files
# owned be the user invoking the program. While this provides some additional
# protection, please use with care as applications running under this profile
# are effectively running without any AppArmor protection. Use this profile
# only if the process absolutely must be run (effectively) unconfined.
#
# Usage:
# Because this abstraction defines the sanitized_helper profile, it must only
# be #included once. Therefore this abstraction should typically not be
# included in other abstractions so as to avoid parser errors regarding
# multiple definitions.
#
# Limitations:
# 1. This does not work for root owned processes, because of the way we use
# owner matching in the sanitized helper. We could do a better job with
# this to support root, but it would make the policy harder to understand
# and going unconfined as root is not desirable any way.
#
# 2. For this sanitized_helper to work, the program running in the sanitized
# environment must open symlinks directly in order for AppArmor to mediate
# it. This is confirmed to work with:
# - compiled code which can load shared libraries
# - python imports
# It is known not to work with:
# - perl includes
# 3. Sanitizing ruby and java
#
# Use at your own risk. This profile was developed as an interim workaround for
# LP: #851986 until AppArmor utilizes proper environment filtering.
profile sanitized_helper {
#include <abstractions/base>
# Allow all networking
network inet,
network inet6,
# Allow exec of anything, but under this profile. Allow transition
# to other profiles if they exist.
/bin/* Pixr,
/sbin/* Pixr,
/usr/bin/* Pixr,
/usr/sbin/* Pixr,
# Allow exec of libexec applications in /usr/lib*
/usr/lib*/{,**/}* Pixr,
# Full access
/ r,
/** rwkl,
/{,usr/}lib{,32,64}/{,**/}*.so{,.*} m,
# Dangerous files
audit deny owner /**/* m, # compiled libraries
audit deny owner /**/*.py* r, # python imports
}
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