To see all syscalls made by a specific program:
# By pid:
auditctl -a always,exit -S all -F pid=1005
# By executable path
auditctl -a always,exit -S all -F exe=/usr/bin/ls
To see files opened by a specific user:
auditctl -a always,exit -S openat -F auid=510
To see unsuccessful openat calls:
auditctl -a always,exit -S openat -F success=0
To watch a file for changes (2 ways to express):
auditctl -w /etc/shadow -p wa
auditctl -a always,exit -F path=/etc/shadow -F perm=wa
To recursively watch a directory for changes (2 ways to express):
auditctl -w /etc/ -p wa
auditctl -a always,exit -F dir=/etc/ -F perm=wa
To see if an admin is accessing other user's files:
auditctl -a always,exit -F dir=/home/ -F uid=0 -C auid!=obj_uid
