[PATCH ghak90 V6 00/10] audit: implement container identifier

Neil Horman nhorman at tuxdriver.com
Mon Apr 22 11:38:10 UTC 2019


On Mon, Apr 08, 2019 at 11:39:07PM -0400, Richard Guy Briggs wrote:
> Implement kernel audit container identifier.
> 
> This patchset is a fifth based on the proposal document (V3)
> posted:
> 	https://www.redhat.com/archives/linux-audit/2018-January/msg00014.html
> 
> The first patch was the last patch from ghak81 that was absorbed into
> this patchset since its primary justification is the rest of this
> patchset.
> 
> The second patch implements the proc fs write to set the audit container
> identifier of a process, emitting an AUDIT_CONTAINER_OP record to
> announce the registration of that audit container identifier on that
> process.  This patch requires userspace support for record acceptance
> and proper type display.
> 
> The third implements reading the audit container identifier from the
> proc filesystem for debugging.  This patch wasn't planned for upstream
> inclusion but is starting to become more likely.
> 
> The fourth implements the auxiliary record AUDIT_CONTAINER_ID if an audit
> container identifier is associated with an event.  This patch requires
> userspace support for proper type display.
> 
> The 5th adds audit daemon signalling provenance through audit_sig_info2.
> 
> The 6th creates a local audit context to be able to bind a standalone
> record with a locally created auxiliary record.
> 
> The 7th patch adds audit container identifier records to the user
> standalone records.
> 
> The 8th adds audit container identifier filtering to the exit,
> exclude and user lists.  This patch adds the AUDIT_CONTID field and
> requires auditctl userspace support for the --contid option.
> 
> The 9th adds network namespace audit container identifier labelling
> based on member tasks' audit container identifier labels.
> 
> The 10th adds audit container identifier support to standalone netfilter
> records that don't have a task context and lists each container to which
> that net namespace belongs.
> 
> Example: Set an audit container identifier of 123456 to the "sleep" task:
> 
>   sleep 2&
>   child=$!
>   echo 123456 > /proc/$child/audit_containerid; echo $?
>   ausearch -ts recent -m container_op
>   echo child:$child contid:$( cat /proc/$child/audit_containerid)
> 
> This should produce a record such as:
> 
>   type=CONTAINER_OP msg=audit(2018-06-06 12:39:29.636:26949) : op=set opid=2209 contid=123456 old-contid=18446744073709551615 pid=628 auid=root uid=root tty=ttyS0 ses=1 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 comm=bash exe=/usr/bin/bash res=yes
> 
> 
> Example: Set a filter on an audit container identifier 123459 on /tmp/tmpcontainerid:
> 
>   contid=123459
>   key=tmpcontainerid
>   auditctl -a exit,always -F dir=/tmp -F perm=wa -F contid=$contid -F key=$key
>   perl -e "sleep 1; open(my \$tmpfile, '>', \"/tmp/$key\"); close(\$tmpfile);" &
>   child=$!
>   echo $contid > /proc/$child/audit_containerid
>   sleep 2
>   ausearch -i -ts recent -k $key
>   auditctl -d exit,always -F dir=/tmp -F perm=wa -F contid=$contid -F key=$key
>   rm -f /tmp/$key
> 
> This should produce an event such as:
> 
>   type=CONTAINER_ID msg=audit(2018-06-06 12:46:31.707:26953) : contid=123459
>   type=PROCTITLE msg=audit(2018-06-06 12:46:31.707:26953) : proctitle=perl -e sleep 1; open(my $tmpfile, '>', "/tmp/tmpcontainerid"); close($tmpfile);
>   type=PATH msg=audit(2018-06-06 12:46:31.707:26953) : item=1 name=/tmp/tmpcontainerid inode=25656 dev=00:26 mode=file,644 ouid=root ogid=root rdev=00:00 obj=unconfined_u:object_r:user_tmp_t:s0 nametype=CREATE cap_fp=none cap_fi=none cap_fe=0 cap_fver=0
>   type=PATH msg=audit(2018-06-06 12:46:31.707:26953) : item=0 name=/tmp/ inode=8985 dev=00:26 mode=dir,sticky,777 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:tmp_t:s0 nametype=PARENT cap_fp=none cap_fi=none cap_fe=0 cap_fver=0
>   type=CWD msg=audit(2018-06-06 12:46:31.707:26953) : cwd=/root
>   type=SYSCALL msg=audit(2018-06-06 12:46:31.707:26953) : arch=x86_64 syscall=openat success=yes exit=3 a0=0xffffffffffffff9c a1=0x5621f2b81900 a2=O_WRONLY|O_CREAT|O_TRUNC a3=0x1b6 items=2 ppid=628 pid=2232 auid=root uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=ttyS0 ses=1 comm=perl exe=/usr/bin/perl subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=tmpcontainerid
> 
> Example: Test multiple containers on one netns:
> 
>   sleep 5 &
>   child1=$!
>   containerid1=123451
>   echo $containerid1 > /proc/$child1/audit_containerid
>   sleep 5 &
>   child2=$!
>   containerid2=123452
>   echo $containerid2 > /proc/$child2/audit_containerid
>   iptables -I INPUT -i lo -p icmp --icmp-type echo-request -j AUDIT --type accept
>   iptables -I INPUT  -t mangle -i lo -p icmp --icmp-type echo-request -j MARK --set-mark 0x12345555
>   sleep 1;
>   bash -c "ping -q -c 1 127.0.0.1 >/dev/null 2>&1"
>   sleep 1;
>   ausearch -i -m NETFILTER_PKT -ts boot|grep mark=0x12345555
>   ausearch -i -m NETFILTER_PKT -ts boot|grep contid=|grep $containerid1|grep $containerid2
> 
> This should produce an event such as:
> 
>   type=NETFILTER_PKT msg=audit(03/15/2019 14:16:13.369:244) : mark=0x12345555 saddr=127.0.0.1 daddr=127.0.0.1 proto=icmp
>   type=CONTAINER_ID msg=audit(03/15/2019 14:16:13.369:244) : contid=123452,123451
> 
> 
> Includes the last patch of https://github.com/linux-audit/audit-kernel/issues/81
> Please see the github audit kernel issue for the main feature:
>   https://github.com/linux-audit/audit-kernel/issues/90
> and the kernel filter code:
>   https://github.com/linux-audit/audit-kernel/issues/91
> and the network support:
>   https://github.com/linux-audit/audit-kernel/issues/92
> Please see the github audit userspace issue for supporting record types:
>   https://github.com/linux-audit/audit-userspace/issues/51
> and filter code:
>   https://github.com/linux-audit/audit-userspace/issues/40
> Please see the github audit testsuiite issue for the test case:
>   https://github.com/linux-audit/audit-testsuite/issues/64
> Please see the github audit wiki for the feature overview:
>   https://github.com/linux-audit/audit-kernel/wiki/RFE-Audit-Container-ID
> 
> 
> Changelog:
> 
> v6
> - change TMPBUFLEN from 11 to 21 to cover the decimal value of contid
>   u64 (nhorman)
> - fix bug overwriting ctx in struct audit_sig_info, move cid above
>   ctx[0] (nhorman)
> - fix bug skipping remaining fields and not advancing bufp when copying
>   out contid in audit_krule_to_data (omosnacec)
> - add acks, tidy commit descriptions, other formatting fixes (checkpatch
>   wrong on audit_log_lost)
> - cast ull for u64 prints
> - target_cid tracking was moved from the ptrace/signal patch to
>   container_op
> - target ptrace and signal records were moved from the ptrace/signal
>   patch to container_id
> - auditd signaller tracking was moved to a new AUDIT_SIGNAL_INFO2
>   request and record
> - ditch unnecessary list_empty() checks
> - check for null net and aunet in audit_netns_contid_add()
> - swap CONTAINER_OP contid/old-contid order to ease parsing
> 
> v5
> - address loginuid and sessionid syscall scope in ghak104
> - address audit_context in CONFIG_AUDIT vs CONFIG_AUDITSYSCALL in ghak105
> - remove tty patch, addressed in ghak106
> - rebase on audit/next v5.0-rc1
>   w/ghak59/ghak104/ghak103/ghak100/ghak107/ghak105/ghak106/ghak105sup
> - update CONTAINER_ID to CONTAINER_OP in patch description
> - move audit_context in audit_task_info to CONFIG_AUDITSYSCALL
> - move audit_alloc() and audit_free() out of CONFIG_AUDITSYSCALL and into
>   CONFIG_AUDIT and create audit_{alloc,free}_syscall
> - use plain kmem_cache_alloc() rather than kmem_cache_zalloc() in audit_alloc()
> - fix audit_get_contid() declaration type error
> - move audit_set_contid() from auditsc.c to audit.c
> - audit_log_contid() returns void
> - audit_log_contid() handed contid rather than tsk
> - switch from AUDIT_CONTAINER to AUDIT_CONTAINER_ID for aux record
> - move audit_log_contid(tsk/contid) & audit_contid_set(tsk)/audit_contid_valid(contid)
> - switch from tsk to current
> - audit_alloc_local() calls audit_log_lost() on failure to allocate a context
> - add AUDIT_USER* non-syscall contid record
> - cosmetic cleanup double parens, goto out on err
> - ditch audit_get_ns_contid_list_lock(), fix aunet lock race
> - switch from all-cpu read spinlock to rcu, keep spinlock for write
> - update audit_alloc_local() to use ktime_get_coarse_real_ts64()
> - add nft_log support
> - add call from do_exit() in audit_free() to remove contid from netns
> - relegate AUDIT_CONTAINER ref= field (was op=) to debug patch
> 
> v4
> - preface set with ghak81:"collect audit task parameters"
> - add shallyn and sgrubb acks
> - rename feature bitmap macro
> - rename cid_valid() to audit_contid_valid()
> - rename AUDIT_CONTAINER_ID to AUDIT_CONTAINER_OP
> - delete audit_get_contid_list() from headers
> - move work into inner if, delete "found"
> - change netns contid list function names
> - move exports for audit_log_contid audit_alloc_local audit_free_context to non-syscall patch
> - list contids CSV
> - pass in gfp flags to audit_alloc_local() (fix audit_alloc_context callers)
> - use "local" in lieu of abusing in_syscall for auditsc_get_stamp()
> - read_lock(&tasklist_lock) around children and thread check
> - task_lock(tsk) should be taken before first check of tsk->audit
> - add spin lock to contid list in aunet
> - restrict /proc read to CAP_AUDIT_CONTROL
> - remove set again prohibition and inherited flag
> - delete contidion spelling fix from patchset, send to netdev/linux-wireless
> 
> v3
> - switched from containerid in task_struct to audit_task_info (depends on ghak81)
> - drop INVALID_CID in favour of only AUDIT_CID_UNSET
> - check for !audit_task_info, throw -ENOPROTOOPT on set
> - changed -EPERM to -EEXIST for parent check
> - return AUDIT_CID_UNSET if !audit_enabled
> - squash child/thread check patch into AUDIT_CONTAINER_ID patch
> - changed -EPERM to -EBUSY for child check
> - separate child and thread checks, use -EALREADY for latter
> - move addition of op= from ptrace/signal patch to AUDIT_CONTAINER patch
> - fix && to || bashism in ptrace/signal patch
> - uninline and export function for audit_free_context()
> - drop CONFIG_CHANGE, FEATURE_CHANGE, ANOM_ABEND, ANOM_SECCOMP patches
> - move audit_enabled check (xt_AUDIT)
> - switched from containerid list in struct net to net_generic's struct audit_net
> - move containerid list iteration into audit (xt_AUDIT)
> - create function to move namespace switch into audit
> - switched /proc/PID/ entry from containerid to audit_containerid
> - call kzalloc with GFP_ATOMIC on in_atomic() in audit_alloc_context()
> - call kzalloc with GFP_ATOMIC on in_atomic() in audit_log_container_info()
> - use xt_net(par) instead of sock_net(skb->sk) to get net
> - switched record and field names: initial CONTAINER_ID, aux CONTAINER, field CONTID
> - allow to set own contid
> - open code audit_set_containerid
> - add contid inherited flag
> - ccontainerid and pcontainerid eliminated due to inherited flag
> - change name of container list funcitons
> - rename containerid to contid
> - convert initial container record to syscall aux
> - fix spelling mistake of contidion in net/rfkill/core.c to avoid contid name collision
> 
> v2
> - add check for children and threads
> - add network namespace container identifier list
> - add NETFILTER_PKT audit container identifier logging
> - patch description and documentation clean-up and example
> - reap unused ppid
> 
> Richard Guy Briggs (10):
>   audit: collect audit task parameters
>   audit: add container id
>   audit: read container ID of a process
>   audit: log container info of syscalls
>   audit: add contid support for signalling the audit daemon
>   audit: add support for non-syscall auxiliary records
>   audit: add containerid support for user records
>   audit: add containerid filtering
>   audit: add support for containerid to network namespaces
>   audit: NETFILTER_PKT: record each container ID associated with a netNS
> 
>  fs/proc/base.c              |  57 +++++++-
>  include/linux/audit.h       | 113 +++++++++++++--
>  include/linux/sched.h       |   7 +-
>  include/uapi/linux/audit.h  |   9 +-
>  init/init_task.c            |   3 +-
>  init/main.c                 |   2 +
>  kernel/audit.c              | 325 ++++++++++++++++++++++++++++++++++++++++++--
>  kernel/audit.h              |   9 ++
>  kernel/auditfilter.c        |  47 +++++++
>  kernel/auditsc.c            |  90 ++++++++----
>  kernel/fork.c               |   1 -
>  kernel/nsproxy.c            |   4 +
>  net/netfilter/nft_log.c     |  11 +-
>  net/netfilter/xt_AUDIT.c    |  11 +-
>  security/selinux/nlmsgtab.c |   1 +
>  15 files changed, 627 insertions(+), 63 deletions(-)
> 
> -- 
> 1.8.3.1
> 
> 
I'm sorry, I've lost track of this, where have we landed on it? Are we good for
inclusion?
Neil



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