On Sat, Feb 12, 2022 at 6:59 PM Ondrej Mosnacek <omosnace@xxxxxxxxxx> wrote: > This is a third round of patches to fix the SCTP-SELinux interaction > w.r.t. client-side peeloff. The patches are a modified version of Xin > Long's patches posted previously, of which only a part was merged (the > rest was merged for a while, but was later reverted): > https://lore.kernel.org/selinux/cover.1635854268.git.lucien.xin@xxxxxxxxx/T/ > > In gist, these patches replace the call to > security_inet_conn_established() in SCTP with a new hook > security_sctp_assoc_established() and implement the new hook in SELinux > so that the client-side association labels are set correctly (which > matters in case the association eventually gets peeled off into a > separate socket). > > Note that other LSMs than SELinux don't implement the SCTP hooks nor > inet_conn_established, so they shouldn't be affected by any of these > changes. > > These patches were tested by selinux-testsuite [1] with an additional > patch [2] and by lksctp-tools func_tests [3]. > > Changes since v2: > - patches 1 and 2 dropped as they are already in mainline (not reverted) > - in patch 3, the return value of security_sctp_assoc_established() is > changed to int, the call is moved earlier in the function, and if the > hook returns an error value, the packet will now be discarded, > aborting the association > - patch 4 has been changed a lot - please see the patch description for > details on how the hook is now implemented and why > > [1] https://github.com/SELinuxProject/selinux-testsuite/ > [2] https://patchwork.kernel.org/project/selinux/patch/20211021144543.740762-1-omosnace@xxxxxxxxxx/ Actually, that patch no longer applies to the current master. Please refer to this rebased version instead: https://patchwork.kernel.org/project/selinux/patch/20220212213454.689886-1-omosnace@xxxxxxxxxx/ > [3] https://github.com/sctp/lksctp-tools/tree/master/src/func_tests > > Ondrej Mosnacek (2): > security: add sctp_assoc_established hook > security: implement sctp_assoc_established hook in selinux > > Documentation/security/SCTP.rst | 22 ++++---- > include/linux/lsm_hook_defs.h | 2 + > include/linux/lsm_hooks.h | 5 ++ > include/linux/security.h | 8 +++ > net/sctp/sm_statefuns.c | 8 +-- > security/security.c | 7 +++ > security/selinux/hooks.c | 90 ++++++++++++++++++++++++--------- > 7 files changed, 103 insertions(+), 39 deletions(-) > > -- > 2.34.1 > -- Ondrej Mosnacek Software Engineer, Linux Security - SELinux kernel Red Hat, Inc.
