On Fri, 08 Jun 2007 06:23:23 +0200 Miloslav Trmac <[email protected]> wrote:
> From: Miloslav Trmac <[email protected]>
>
> Add TTY input auditing, used to audit system administrator's actions.
> TTY input auditing works on a higher level than auditing all system
> calls within the session, which would produce an overwhelming amount of
> mostly useless audit events.
>
> Add an "audit_tty" attribute, inherited across fork (). Data read from
> TTYs by process with the attribute is sent to the audit subsystem by the
> kernel. The audit netlink interface is extended to allow modifying the
> audit_tty attribute, and to allow sending explanatory audit events from
> user-space (for example, a shell might send an event containing the
> final command, after the interactive command-line editing and history
> expansion is performed, which might be difficult to decipher from the
> TTY input alone).
>
> Because the "audit_tty" attribute is inherited across fork (), it would
> be set e.g. for sshd restarted within an audited session. To prevent
> this, the audit_tty attribute is cleared when a process with no open TTY
> file descriptors (e.g. after daemon startup) opens a TTY.
>
> See https://www.redhat.com/archives/linux-audit/2007-June/msg00000.html
> for a more detailed rationale document for an older version of this patch.
>
> ---
> Changes since the previous patch:
> * use spin_lock_irq() for siglock
> * add an is_tty() function instead of checking f_op->read from n_tty.c;
> handle hung TTYs
> * replace the audit_tty bit field by a whole word to avoid the risk of
> incorrect locking
> * move most new code from n_tty.c to a separate file
> * fix coding style violations
> * fix compilation with !CONFIG_AUDIT
>
> diff --git a/include/linux/sched.h b/include/linux/sched.h
> index d58e74b..d9d734c 100644
> --- a/include/linux/sched.h
> +++ b/include/linux/sched.h
> @@ -506,6 +506,8 @@ struct signal_struct {
> #ifdef CONFIG_TASKSTATS
> struct taskstats *stats;
> #endif
> + unsigned audit_tty;
> + struct tty_audit_buf *tty_audit_buf;
> };
Can we ifdef these?
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