On Monday, September 25, 2017 12:43:28 AM EDT Amir Goldstein wrote: > On Sun, Sep 24, 2017 at 11:25 PM, Steve Grubb <sgrubb@xxxxxxxxxx> wrote: > > Hello, > > > > 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_AUDIT_ENABLE to ensure that the kernel > > supports auditing. The calling process must also have the CAP_AUDIT_WRITE > > capability. > > > > Signed-off-by: sgrubb <sgrubb@xxxxxxxxxx> > > Please CC linux-api !!! Missed that. Will be cc'ed on v3. > A few small nits below I have corrected those and will send v3 shortly after I re-verify the patch still works. Thanks, -Steve
