Re: [PATCH ghak90 (was ghak32) V4 03/10] audit: log container info of syscalls

Steve Grubb
2018-08-24T16:01:56Z

On Tuesday, July 31, 2018 4:07:38 PM EDT Richard Guy Briggs wrote:
> Create a new audit record AUDIT_CONTAINER to document the audit
> container identifier of a process if it is present.
>
> Called from audit_log_exit(), syscalls are covered.
>
> A sample raw event:
> type=SYSCALL msg=audit(1519924845.499:257): arch=c000003e syscall=257
> success=yes exit=3 a0=ffffff9c a1=56374e1cef30 a2=241 a3=1b6 items=2
> ppid=606 pid=635 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0
> fsgid=0 tty=pts0 ses=3 comm="bash" exe="/usr/bin/bash"
> subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
> key="tmpcontainerid" type=CWD msg=audit(1519924845.499:257): cwd="/root"
> type=PATH msg=audit(1519924845.499:257): item=0 name="/tmp/" inode=13863
> dev=00:27 mode=041777 ouid=0 ogid=0 rdev=00:00
> obj=system_u:object_r:tmp_t:s0 nametype= PARENT cap_fp=0000000000000000
> cap_fi=0000000000000000 cap_fe=0 cap_fver=0 type=PATH
> msg=audit(1519924845.499:257): item=1 name="/tmp/tmpcontainerid"
> inode=17729 dev=00:27 mode=0100644 ouid=0 ogid=0 rdev=00:00
> obj=unconfined_u:object_r:user_tmp_t:s0 nametype=CREATE
> cap_fp=0000000000000000 cap_fi=0000000000000000 cap_fe=0 cap_fver=0
> type=PROCTITLE msg=audit(1519924845.499:257):
> proctitle=62617368002D6300736C65657020313B206563686F2074657374203E202F746D
> 702F746D70636F6E7461696E65726964 type=CONTAINER
> msg=audit(1519924845.499:257): op=task contid=123458

Ack for the event format.

-Steve

> See: https://github.com/linux-audit/audit-kernel/issues/90
> See: https://github.com/linux-audit/audit-userspace/issues/51
> See: https://github.com/linux-audit/audit-testsuite/issues/64
> See:
> https://github.com/linux-audit/audit-kernel/wiki/RFE-Audit-Container-ID
> Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
> Acked-by: Serge Hallyn <serge@hallyn.com>
> Acked-by: Steve Grubb <sgrubb@redhat.com>
> ---
> include/linux/audit.h | 7 +++++++
> include/uapi/linux/audit.h | 1 +
> kernel/audit.c | 24 ++++++++++++++++++++++++
> kernel/auditsc.c | 3 +++
> 4 files changed, 35 insertions(+)
>
> diff --git a/include/linux/audit.h b/include/linux/audit.h
> index 71a6fc6..d5a48dc 100644
> --- a/include/linux/audit.h
> +++ b/include/linux/audit.h
> @@ -155,6 +155,9 @@ extern void audit_log_key(struct audit_buffer
*ab,
> extern int audit_log_task_context(struct audit_buffer *ab);
> extern void audit_log_task_info(struct audit_buffer *ab,
> struct task_struct *tsk);
> +extern int audit_log_contid(struct task_struct *tsk,
> + struct audit_context *context,
> + char *op);
>
> extern int audit_update_lsm_rules(void);
>
> @@ -205,6 +208,10 @@ static inline int audit_log_task_context(struct
> audit_buffer *ab) static inline void audit_log_task_info(struct
> audit_buffer *ab,
> struct task_struct *tsk)
> { }
> +static inline int audit_log_contid(struct task_struct *tsk,
> + struct audit_context *context,
> + char *op)
> +{ }
> #define audit_enabled AUDIT_OFF
> #endif /* CONFIG_AUDIT */
>
> diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h
> index 3474f57..dc259c7 100644
> --- a/include/uapi/linux/audit.h
> +++ b/include/uapi/linux/audit.h
> @@ -115,6 +115,7 @@
> #define AUDIT_REPLACE 1329 /* Replace auditd if this packet unanswerd
*/
> #define AUDIT_KERN_MODULE 1330 /* Kernel Module events */
> #define AUDIT_FANOTIFY 1331 /* Fanotify access decision */
> +#define AUDIT_CONTAINER 1332 /* Container ID */
>
> #define AUDIT_AVC 1400 /* SE Linux avc denial or grant */
> #define AUDIT_SELINUX_ERR 1401 /* Internal SE Linux Errors */
> diff --git a/kernel/audit.c b/kernel/audit.c
> index 2a80587..15f54c7 100644
> --- a/kernel/audit.c
> +++ b/kernel/audit.c
> @@ -2045,6 +2045,30 @@ void audit_log_session_info(struct audit_buffer *ab)
> audit_log_format(ab, " auid=%u ses=%u", auid, sessionid);
> }
>
> +/*
> + * audit_log_contid - report container info
> + * @tsk: task to be recorded
> + * @context: task or local context for record
> + * @op: contid string description
> + */
> +int audit_log_contid(struct task_struct *tsk,
> + struct audit_context *context, char *op)
> +{
> + struct audit_buffer *ab;
> +
> + if (!audit_contid_set(tsk))
> + return 0;
> + /* Generate AUDIT_CONTAINER record with container ID */
> + ab = audit_log_start(context, GFP_KERNEL, AUDIT_CONTAINER);
> + if (!ab)
> + return -ENOMEM;
> + audit_log_format(ab, "op=%s contid=%llu",
> + op, audit_get_contid(tsk));
> + audit_log_end(ab);
> + return 0;
> +}
> +EXPORT_SYMBOL(audit_log_contid);
> +
> void audit_log_key(struct audit_buffer *ab, char *key)
> {
> audit_log_format(ab, " key=");
> diff --git a/kernel/auditsc.c b/kernel/auditsc.c
> index 6125cef..39e5633 100644
> --- a/kernel/auditsc.c
> +++ b/kernel/auditsc.c
> @@ -1488,10 +1488,13 @@ static void audit_log_exit(struct audit_context
> *context, struct task_struct *ts
>
> audit_log_proctitle(tsk, context);
>
> + audit_log_contid(tsk, context, "task");
> +
> /* Send end of event record to help user space know we are finished */
> ab = audit_log_start(context, GFP_KERNEL, AUDIT_EOE);
> if (ab)
> audit_log_end(ab);
> +
> if (call_panic)
> audit_panic("error converting sid to string");
> }