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    Subject[PATCH ghak90 V5 04/10] audit: log container info of syscalls
    Date
    Create a new audit record AUDIT_CONTAINER_ID 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=0 cap_fi=0 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=0 cap_fi=0 cap_fe=0 cap_fver=0
    type=PROCTITLE msg=audit(1519924845.499:257): proctitle=62617368002D6300736C65657020313B206563686F2074657374203E202F746D702F746D70636F6E7461696E65726964
    type=CONTAINER_ID msg=audit(1519924845.499:257): contid=123458

    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>
    Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
    ---
    include/linux/audit.h | 5 +++++
    include/uapi/linux/audit.h | 1 +
    kernel/audit.c | 21 +++++++++++++++++++++
    kernel/auditsc.c | 2 ++
    4 files changed, 29 insertions(+)

    diff --git a/include/linux/audit.h b/include/linux/audit.h
    index 301337776193..43438192ca2a 100644
    --- a/include/linux/audit.h
    +++ b/include/linux/audit.h
    @@ -199,6 +199,8 @@ static inline u64 audit_get_contid(struct task_struct *tsk)
    return tsk->audit->contid;
    }

    +extern void audit_log_contid(struct audit_context *context, u64 contid);
    +
    extern u32 audit_enabled;
    #else /* CONFIG_AUDIT */
    static inline int audit_alloc(struct task_struct *task)
    @@ -265,6 +267,9 @@ static inline u64 audit_get_contid(struct task_struct *tsk)
    return AUDIT_CID_UNSET;
    }

    +static inline void audit_log_contid(struct audit_context *context, u64 contid)
    +{ }
    +
    #define audit_enabled AUDIT_OFF
    #endif /* CONFIG_AUDIT */

    diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h
    index d475cf3b4d7f..a6383e28b2c8 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_ID 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 b5c702abeb42..8cc0e88d7f2a 100644
    --- a/kernel/audit.c
    +++ b/kernel/audit.c
    @@ -2127,6 +2127,27 @@ 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
    + * @context: task or local context for record
    + * @contid: container ID to report
    + */
    +void audit_log_contid(struct audit_context *context, u64 contid)
    +{
    + struct audit_buffer *ab;
    +
    + if (!audit_contid_valid(contid))
    + return;
    + /* Generate AUDIT_CONTAINER_ID record with container ID */
    + ab = audit_log_start(context, GFP_KERNEL, AUDIT_CONTAINER_ID);
    + if (!ab)
    + return;
    + audit_log_format(ab, "contid=%llu", contid);
    + audit_log_end(ab);
    + return;
    +}
    +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 8090eff7868d..a8c8b44b954d 100644
    --- a/kernel/auditsc.c
    +++ b/kernel/auditsc.c
    @@ -1548,6 +1548,8 @@ static void audit_log_exit(void)

    audit_log_proctitle();

    + audit_log_contid(context, audit_get_contid(current));
    +
    /* Send end of event record to help user space know we are finished */
    ab = audit_log_start(context, GFP_KERNEL, AUDIT_EOE);
    if (ab)
    --
    1.8.3.1
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