Re: [PATCH ghak59 V3 0/4] audit: config_change normalizations and event record gathering

[Paul Moore]

On Mon, Dec 10, 2018 at 5:18 PM Richard Guy Briggs <rgb@xxxxxxxxxx> wrote:
> Make a number of changes to normalize CONFIG_CHANGE records by adding
> missing op= fields, providing more information in existing op fields
> (optional last patch) and connecting all records to existing audit
> events.  The user record needs special-casing since its content isn't
> directly related to the call that logs it.
>
> Since tree purge records are processed after the EOE record is produced,
> the order of operation of the EOE record and the purge will have to be
> reversed so that the purge records can be included in the event.
>
> The last patch is included for completeness understanding it may be more
> information than necessary.
>
> For reference, here are the calling methods and function tree for all
> CONFIG_CHANGE events with fields:
> - audit_log_config_change()
>         - add "op=set" to fields: "[op] <param-name> old auid ses subj res"
>         - AUDIT_SET:AUDIT_STATUS_PID
>         - AUDIT_SET:AUDIT_STATUS_LOST
>         - audit_do_config_change()
>                 - AUDIT_SET:AUDIT_STATUS_FAILURE
>                 - AUDIT_SET:AUDIT_STATUS_ENABLED
>                 - AUDIT_SET:AUDIT_STATUS_RATE_LIMIT
>                 - AUDIT_SET:AUDIT_STATUS_BACKLOG_LIMIT
>                 - AUDIT_SET:AUDIT_STATUS_BACKLOG_WAIT_TIME
> - audit_log_rule_change()
>         - fields: "auid ses subj op key list res"
>         - AUDIT_ADD_RULE -F dir=...
>         - AUDIT_DEL_RULE -F dir=...
> - audit_log_common_recv_msg()
>         - fields: "pid uid auid ses subj ..."
>         - AUDIT_*USER* events (not CONFIG_CHANGE like all the rest)
>         - AUDIT_LOCKED add "op={add,remove}_rule" to "[op] audit_enabled res"
>         - AUDIT_TRIM "op=trim res"
>         - AUDIT_MAKE_EQUIV: "op=make_equiv old new res"
>         - AUDIT_TTY_SET: "op=tty_set old-enabled new-enabled old-log_passwd new-log_passwd res"
> - audit_mark_log_rule_change()
>         - add ":mark" to op in fields: "uid ses op=autoremove_rule[] path key list res"
>         - audit_autoremove_mark_rule()
>                 - audit_mark_handle_event()
>                         - audit_mark_fsnotify_ops.handle_event
> - audit_tree_log_remove_rule() called from kill_rules()
>         - add to op ":tree:%s" to fields: "op=remove_rule[] dir key list res"
>         - from trim_marked()
>                 - AUDIT_TRIM: audit_trim_trees() "trim"
>                 - audit_add_tree_rule() iterate_mounts err "add"
>                         - audit_add_rule()
>                                 - audit_rule_change()
>                                         - AUDIT_ADD_RULE -F dir=...
>                 - AUDIT_MAKE_EQUIV: audit_tag_tree() iterate_mounts err "equiv"
>         - from audit_kill_trees()
>                 - __audit_free() "free"
>                         - do_exit()
>                         - copy_process() err
>                 - __audit_syscall_exit() "exit"
>         - from evict_chunk() "evict"
>                 - audit_tree_freeing_mark()
>                         - audit_tree_ops.freeing_mark
> - audit_watch_log_rule_change()
>         add to op ":watch:%s" to fields "auid ses op={updated,remove}_rule[] path key list res"
>         - audit_update_watch() "updated_rules:watch:inval" : "updated_rules:watch:set"
>                 - audit_watch_handle_event() FS_CREATE|FS_MOVED_TO, FS_DELETE|FS_MOVED_FROM
>                         - audit_watch_fsnotify_ops.handle_event
>         - audit_remove_parent_watches() "remove_rule:watch:parent"
>                 - audit_watch_handle_event() FS_DELETE_SELF|FS_UNMOUNT|FS_MOVE_SELF
>                         - audit_watch_fsnotify_ops.handle_event
> - audit_seccomp_actions_logged()
>         - fields: "op actions old-actions res"
>
>
> See: https://github.com/linux-audit/audit-kernel/issues/50
> See: https://github.com/linux-audit/audit-kernel/issues/59
>
> Sources of AUDIT_CONFIG_CHANGE records and their current and proposed
> fields are listed here
>         https://github.com/linux-audit/audit-kernel/issues/59#issuecomment-445055154
>
> Changelog:
> v3:
> - un-clever %s_rule to not break up op values
> - create audit_log_user_recv_msg() and squash into record connection
> - squash kill_trees context handling with kill-trees before EOE
> - rebase on audit/next (v4.20-rc1) with 2a1fe215e730 ("audit: use current whenever possible")
> - remove parens in extended format
>
> v2:
> - re-order audit_log_exit() and audit_kill_trees()
> - drop EOE reordering patch
> - rebase on 4.18-rc1 (audit/next)
>
> Richard Guy Briggs (4):
>   audit: give a clue what CONFIG_CHANGE op was involved
>   audit: add syscall information to CONFIG_CHANGE records
>   audit: hand taken context to audit_kill_trees for syscall logging
>   audit: extend config_change mark/watch/tree rule changes
>
>  kernel/audit.c          | 33 +++++++++++++++++++++++----------
>  kernel/audit.h          |  4 ++--
>  kernel/audit_fsnotify.c |  4 ++--
>  kernel/audit_tree.c     | 28 +++++++++++++++-------------
>  kernel/audit_watch.c    |  8 +++++---
>  kernel/auditfilter.c    |  2 +-
>  kernel/auditsc.c        | 12 ++++++------
>  7 files changed, 54 insertions(+), 37 deletions(-)

In order to make sure expectations are set appropriately, as we are at
-rc6 right now this is not something that would go into audit/next now
(assuming everything looks okay on review), it would go into
audit/next *after* the upcoming merge window.

-- 
paul moore
www.paul-moore.com