[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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