linux/fs/notify
Steve Grubb de8cd83e91 audit: Record fanotify access control decisions
The fanotify interface allows user space daemons to make access
control decisions. Under common criteria requirements, we need to
optionally record decisions based on policy. This patch adds a bit mask,
FAN_AUDIT, that a user space daemon can 'or' into the response decision
which will tell the kernel that it made a decision and record it.

It would be used something like this in user space code:

  response.response = FAN_DENY | FAN_AUDIT;
  write(fd, &response, sizeof(struct fanotify_response));

When the syscall ends, the audit system will record the decision as a
AUDIT_FANOTIFY auxiliary record to denote that the reason this event
occurred is the result of an access control decision from fanotify
rather than DAC or MAC policy.

A sample event looks like this:

type=PATH msg=audit(1504310584.332:290): item=0 name="./evil-ls"
inode=1319561 dev=fc:03 mode=0100755 ouid=1000 ogid=1000 rdev=00:00
obj=unconfined_u:object_r:user_home_t:s0 nametype=NORMAL
type=CWD msg=audit(1504310584.332:290): cwd="/home/sgrubb"
type=SYSCALL msg=audit(1504310584.332:290): arch=c000003e syscall=2
success=no exit=-1 a0=32cb3fca90 a1=0 a2=43 a3=8 items=1 ppid=901
pid=959 auid=1000 uid=1000 gid=1000 euid=1000 suid=1000
fsuid=1000 egid=1000 sgid=1000 fsgid=1000 tty=pts1 ses=3 comm="bash"
exe="/usr/bin/bash" subj=unconfined_u:unconfined_r:unconfined_t:
s0-s0:c0.c1023 key=(null)
type=FANOTIFY msg=audit(1504310584.332:290): resp=2

Prior to using the audit flag, the developer needs to call
fanotify_init or'ing in FAN_ENABLE_AUDIT to ensure that the kernel
supports auditing. The calling process must also have the CAP_AUDIT_WRITE
capability.

Signed-off-by: sgrubb <sgrubb@redhat.com>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
2017-10-10 13:18:06 +02:00
..
dnotify fsnotify: make dnotify_fsnotify_ops const 2017-08-30 16:02:48 +02:00
fanotify audit: Record fanotify access control decisions 2017-10-10 13:18:06 +02:00
inotify fsnotify: Move ->free_mark callback to fsnotify_ops 2017-04-10 17:37:36 +02:00
fdinfo.c audit: Record fanotify access control decisions 2017-10-10 13:18:06 +02:00
fdinfo.h fs: Convert show_fdinfo functions to void 2014-11-05 14:13:23 -05:00
fsnotify.c dentry name snapshots 2017-07-07 20:09:10 -04:00
fsnotify.h fsnotify: Remove fsnotify_find_{inode|vfsmount}_mark() 2017-04-10 17:37:36 +02:00
group.c fsnotify: Remove fsnotify_detach_group_marks() 2017-04-10 17:37:36 +02:00
Kconfig rcu: Make SRCU optional by using CONFIG_SRCU 2015-01-06 11:04:29 -08:00
Makefile fsnotify: Drop inode_mark.c 2017-04-10 17:37:36 +02:00
mark.c fsnotify: remove a stray unlock 2017-04-24 16:41:28 +02:00
notification.c fsnotify: clean up spinlock assertions 2016-10-07 18:46:26 -07:00