strongSwan AppArmor prevents CRL caching

The attachment "allow-crl-cache.patch" seems to be a patch. If it isn't, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are a member of the ~ubuntu-reviewers, unsubscribe the team.

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Confirmed based on https://wiki.strongswan.org/projects/strongswan/wiki/ConfigSetupSection: "if enabled, certificate revocation lists (CRLs) fetched via HTTP or LDAP will be cached in /etc/ipsec.d/crls/ under a unique file name derived from the certification authority's public key"

So /etc/ipsec.d/crls/* does need write access in the AppArmor profile as you have suggested.

This bug was fixed in the package strongswan - 5.3.5-1ubuntu1

---------------
strongswan (5.3.5-1ubuntu1) xenial; urgency=medium

  * debian/{rules,control,libstrongswan-extra-plugins.install}
    Enable bliss plugin
  * debian/{rules,control,libstrongswan-extra-plugins.install}
    Enable chapoly plugin
  * debian/patches/dont-load-kernel-libipsec-plugin-by-default.patch
    Upstream suggests to not load this plugin by default as it has
    some limitations.
    https://wiki.strongswan.org/projects/strongswan/wiki/Kernel-libipsec
  * debian/patches/increase-bliss-test-timeout.patch
    Under QEMU/KVM for autopkgtest bliss test takes a bit longer then default
  * Update Apparmor profiles
    - usr.lib.ipsec.charon
      - add capability audit_write for xauth-pam (LP: #1470277)
      - add capability dac_override (needed by agent plugin)
      - allow priv dropping (LP: #1333655)
      - allow caching CRLs (LP: #1505222)
      - allow rw access to /dev/net/tun for kernel-libipsec (LP: #1309594)
    - usr.lib.ipsec.stroke
      - allow priv dropping (LP: #1333655)
      - add local include
    - usr.lib.ipsec.lookip
      - add local include
  * Merge from Debian, which includes fixes for all previous CVEs
    Fixes (LP: #1330504, #1451091, #1448870, #1470277)
    Remaining changes:
      * debian/control
        - Lower dpkg-dev to 1.16.1 from 1.16.2 to enable backporting to Precise
        - Update Maintainer for Ubuntu
        - Add build-deps
          - dh-apparmor
          - iptables-dev
          - libjson0-dev
          - libldns-dev
          - libmysqlclient-dev
          - libpcsclite-dev
          - libsoup2.4-dev
          - libtspi-dev
          - libunbound-dev
        - Drop build-deps
          - libfcgi-dev
          - clearsilver-dev
        - Create virtual packages for all strongswan-plugin-* for dist-upgrade
        - Set XS-Testsuite: autopkgtest
      * debian/rules:
        - Enforcing DEB_BUILD_OPTIONS=nostrip for library integrity checking.
        - Set TESTS_REDUCED_KEYLENGTHS to one generate smallest key-lengths in
          tests.
        - Change init/systemd program name to strongswan
        - Install AppArmor profiles
        - Removed pieces on 'patching ipsec.conf' on build.
        - Enablement of features per Ubuntu current config suggested from
          upstream recommendation
        - Unpack and sort enabled features to one-per-line
        - Disable duplicheck as per
          https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=718291#10
        - Disable libfast (--disable-fast):
          Requires dropping medsrv, medcli plugins which depend on libfast
        - Add configure options
          --with-tss=trousers
        - Remove configure options:
          --enable-ha (requires special kernel)
          --enable-unit-test (unit tests run by default)
        - Drop logcheck install
      * debian/tests/*
        - Add DEP8 test for strongswan service and plugins
      * debian/strongswan-starter.strongswan.service
        - Add new systemd file instead of patching upstream
      * debian/strongswan-starter.links
        - removed, use Ubuntu systemd file instead of linking to upstream
      * debia...