Container and system tracing using eBPF
Tracee is a lightweight, easy to use container and system tracing tool. After launching the tool, it will start collecting traces of newly created containers (container mode) or processes (system mode). The collected traces are mostly system calls performed by the processes, but other events, such as capabilities required to perform the actions requested by the process, are also supported.
Currently requires
- kernel version > 4.14
- BCC
As root: start.py [-h] [-c] [-b PAGE_NR] [-j] [-l] [-e EVENTS_TO_TRACE]
optional arguments:
-h, --help show this help message and exit
-c, --container only trace newly created containers
-b {1,2,4,8,16,32,64,128,256,512,1024}, --buf-pages {1,2,4,8,16,32,64,128,256,512,1024} number of pages for perf buffer, defaults to 64
-j, --json save events in json format
-l, --list list events
-e EVENTS_TO_TRACE, --events-to-trace EVENTS_TO_TRACE trace only the specified events and syscalls (default: trace all)
examples:
./start.py -c
Following is an output example of Tracee after running
docker run -it --rm alpine sh
TIME(s) UTS_NAME MNT_NS PID_NS UID EVENT COMM PID TID PPID RET ARGS
61193.235110 e89fcd33936c 4026532402 4026532405 0 execve runc:[2:INIT] 1 1 13670 0 /bin/sh
61193.235178 e89fcd33936c 4026532402 4026532405 0 cap_capable runc:[2:INIT] 1 1 13670 0 CAP_SYS_ADMIN
61193.235207 e89fcd33936c 4026532402 4026532405 0 do_exit runc:[2:INIT] 1 4 13670 0
61193.235206 e89fcd33936c 4026532402 4026532405 0 do_exit runc:[2:INIT] 1 2 13670 0
61193.235207 e89fcd33936c 4026532402 4026532405 0 do_exit runc:[2:INIT] 1 5 13670 0
61193.235206 e89fcd33936c 4026532402 4026532405 0 do_exit runc:[2:INIT] 1 3 13670 0
61193.235873 e89fcd33936c 4026532402 4026532405 0 mprotect sh 1 1 13670 0 0x7f9e08f39000 4096 1
61193.235951 e89fcd33936c 4026532402 4026532405 0 mprotect sh 1 1 13670 0 0x555e7ad57000 16384 1
61193.236050 e89fcd33936c 4026532402 4026532405 0 ioctl sh 1 1 13670 0 0 21523
61193.236062 e89fcd33936c 4026532402 4026532405 0 ioctl sh 1 1 13670 0 1 21523
61193.236088 e89fcd33936c 4026532402 4026532405 0 open sh 1 1 13670 3 /dev/tty O_RDWR
61193.236105 e89fcd33936c 4026532402 4026532405 0 close sh 1 1 13670 0 3
61193.236121 e89fcd33936c 4026532402 4026532405 0 ioctl sh 1 1 13670 0 10 21519
61193.236142 e89fcd33936c 4026532402 4026532405 0 ioctl sh 1 1 13670 0 10 21520
61193.236172 e89fcd33936c 4026532402 4026532405 0 stat sh 1 1 13670 -2 MAILPATH
61193.236191 e89fcd33936c 4026532402 4026532405 0 ioctl sh 1 1 13670 0 0 21505
61193.236214 e89fcd33936c 4026532402 4026532405 0 cap_capable sh 1 1 13670 0 CAP_SYS_ADMIN
61193.236228 e89fcd33936c 4026532402 4026532405 0 open sh 1 1 13670 -2 /root/.ash_history O_RDONLY
61193.236258 e89fcd33936c 4026532402 4026532405 0 ioctl sh 1 1 13670 0 0 21506
61193.236277 e89fcd33936c 4026532402 4026532405 0 open sh 1 1 13670 3 /etc/passwd O_RDONLY|O_CLOEXEC
61193.236300 e89fcd33936c 4026532402 4026532405 0 close sh 1 1 13670 0 3
61193.236313 e89fcd33936c 4026532402 4026532405 0 ioctl sh 1 1 13670 0 0 21523
61193.236334 e89fcd33936c 4026532402 4026532405 0 ioctl sh 1 1 13670 0 1 21523
61193.256423 e89fcd33936c 4026532402 4026532405 0 ioctl sh 1 1 13670 0 0 21523
Executing ls in the alpine container shell will trigger the following events:
61405.843786 e89fcd33936c 4026532402 4026532405 0 cap_capable sh 1 1 13670 0 CAP_SYS_ADMIN
61405.843977 e89fcd33936c 4026532402 4026532405 0 cap_capable sh 1 1 13670 0 CAP_DAC_READ_SEARCH
61405.844080 e89fcd33936c 4026532402 4026532405 0 cap_capable sh 1 1 13670 0 CAP_DAC_OVERRIDE
61405.844284 e89fcd33936c 4026532402 4026532405 0 cap_capable sh 1 1 13670 0 CAP_SYS_ADMIN
61405.844352 e89fcd33936c 4026532402 4026532405 0 cap_capable sh 1 1 13670 0 CAP_DAC_OVERRIDE
61405.844520 e89fcd33936c 4026532402 4026532405 0 open sh 1 1 13670 3 /root/.ash_history O_WRONLY|O_CREAT|O_APPEND
61405.844638 e89fcd33936c 4026532402 4026532405 0 close sh 1 1 13670 0 3
61405.844709 e89fcd33936c 4026532402 4026532405 0 ioctl sh 1 1 13670 0 0 21506
61405.844819 e89fcd33936c 4026532402 4026532405 0 stat sh 1 1 13670 -2 /usr/local/sbin/ls
61405.844891 e89fcd33936c 4026532402 4026532405 0 stat sh 1 1 13670 -2 /usr/local/bin/ls
61405.844951 e89fcd33936c 4026532402 4026532405 0 stat sh 1 1 13670 -2 /usr/sbin/ls
61405.845009 e89fcd33936c 4026532402 4026532405 0 stat sh 1 1 13670 -2 /usr/bin/ls
61405.845067 e89fcd33936c 4026532402 4026532405 0 stat sh 1 1 13670 -2 /sbin/ls
61405.845141 e89fcd33936c 4026532402 4026532405 0 stat sh 1 1 13670 0 /bin/ls
61405.845621 e89fcd33936c 4026532402 4026532405 0 fork sh 1 1 13670 6
61405.849460 e89fcd33936c 4026532402 4026532405 0 ioctl sh 1 1 13670 0 10 21520
61405.849500 e89fcd33936c 4026532402 4026532405 0 stat sh 1 1 13670 -2 MAILPATH
61405.849539 e89fcd33936c 4026532402 4026532405 0 ioctl sh 1 1 13670 0 0 21505
61405.849562 e89fcd33936c 4026532402 4026532405 0 ioctl sh 1 1 13670 0 0 21506
61405.849592 e89fcd33936c 4026532402 4026532405 0 open sh 1 1 13670 3 /etc/passwd O_RDONLY|O_CLOEXEC
61405.849626 e89fcd33936c 4026532402 4026532405 0 close sh 1 1 13670 0 3
61405.849646 e89fcd33936c 4026532402 4026532405 0 ioctl sh 1 1 13670 0 0 21523
61405.845834 e89fcd33936c 4026532402 4026532405 0 ioctl sh 6 6 1 0 10 21520
61405.845966 e89fcd33936c 4026532402 4026532405 0 execve sh 6 6 1 0 /bin/ls
61405.846806 e89fcd33936c 4026532402 4026532405 0 mprotect ls 6 6 1 0 0x7f45e179d000 4096 1
61405.847096 e89fcd33936c 4026532402 4026532405 0 mprotect ls 6 6 1 0 0x555601b06000 16384 1
61405.847319 e89fcd33936c 4026532402 4026532405 0 ioctl ls 6 6 1 0 0 21523
61405.847398 e89fcd33936c 4026532402 4026532405 0 ioctl ls 6 6 1 0 1 21523
61405.847451 e89fcd33936c 4026532402 4026532405 0 ioctl ls 6 6 1 0 1 21523
61405.847517 e89fcd33936c 4026532402 4026532405 0 stat ls 6 6 1 0 .
61405.847595 e89fcd33936c 4026532402 4026532405 0 open ls 6 6 1 3 . O_RDONLY|O_DIRECTORY|O_CLOEXEC
61405.847789 e89fcd33936c 4026532402 4026532405 0 getdents64 ls 6 6 1 496 3
61405.847891 e89fcd33936c 4026532402 4026532405 0 lstat ls 6 6 1 0 ./sys
61405.847956 e89fcd33936c 4026532402 4026532405 0 lstat ls 6 6 1 0 ./usr
61405.848015 e89fcd33936c 4026532402 4026532405 0 lstat ls 6 6 1 0 ./sbin
61405.848097 e89fcd33936c 4026532402 4026532405 0 cap_capable ls 6 6 1 0 CAP_SYS_ADMIN
61405.848167 e89fcd33936c 4026532402 4026532405 0 lstat ls 6 6 1 0 ./home
61405.848231 e89fcd33936c 4026532402 4026532405 0 lstat ls 6 6 1 0 ./lib
61405.848290 e89fcd33936c 4026532402 4026532405 0 lstat ls 6 6 1 0 ./root
61405.848348 e89fcd33936c 4026532402 4026532405 0 lstat ls 6 6 1 0 ./bin
61405.848408 e89fcd33936c 4026532402 4026532405 0 lstat ls 6 6 1 0 ./etc
61405.848476 e89fcd33936c 4026532402 4026532405 0 cap_capable ls 6 6 1 0 CAP_SYS_ADMIN
61405.848523 e89fcd33936c 4026532402 4026532405 0 lstat ls 6 6 1 0 ./run
61405.848599 e89fcd33936c 4026532402 4026532405 0 cap_capable ls 6 6 1 0 CAP_SYS_ADMIN
61405.848643 e89fcd33936c 4026532402 4026532405 0 lstat ls 6 6 1 0 ./srv
61405.848707 e89fcd33936c 4026532402 4026532405 0 lstat ls 6 6 1 0 ./proc
61405.848774 e89fcd33936c 4026532402 4026532405 0 cap_capable ls 6 6 1 0 CAP_SYS_ADMIN
61405.848817 e89fcd33936c 4026532402 4026532405 0 lstat ls 6 6 1 0 ./opt
61405.848879 e89fcd33936c 4026532402 4026532405 0 lstat ls 6 6 1 0 ./dev
61405.848946 e89fcd33936c 4026532402 4026532405 0 cap_capable ls 6 6 1 0 CAP_SYS_ADMIN
61405.848989 e89fcd33936c 4026532402 4026532405 0 lstat ls 6 6 1 0 ./var
61405.849061 e89fcd33936c 4026532402 4026532405 0 cap_capable ls 6 6 1 0 CAP_SYS_ADMIN
61405.849097 e89fcd33936c 4026532402 4026532405 0 lstat ls 6 6 1 0 ./mnt
61405.849123 e89fcd33936c 4026532402 4026532405 0 cap_capable ls 6 6 1 0 CAP_SYS_ADMIN
61405.849139 e89fcd33936c 4026532402 4026532405 0 lstat ls 6 6 1 0 ./tmp
61405.849163 e89fcd33936c 4026532402 4026532405 0 cap_capable ls 6 6 1 0 CAP_SYS_ADMIN
61405.849178 e89fcd33936c 4026532402 4026532405 0 lstat ls 6 6 1 0 ./media
61405.849201 e89fcd33936c 4026532402 4026532405 0 getdents64 ls 6 6 1 0 3
61405.849220 e89fcd33936c 4026532402 4026532405 0 close ls 6 6 1 0 3
61405.849280 e89fcd33936c 4026532402 4026532405 0 ioctl ls 6 6 1 0 1 21523
61405.849318 e89fcd33936c 4026532402 4026532405 0 do_exit ls 6 6 1 0
As can be seen in the above output, each event line shows the following information about the event:
- TIME - shows the event time relative to system boot time in seconds
- UTS_NAME - uts namespace name. As there is no container id object in the kernel, and docker/k8s will usually set this to the container id, we use this field to distinguish between containers.
- MNT_NS - mount namespace inode number.
- PID_NS - pid namespace inode number. In order to know if there are different containers in the same pid namespace (e.g. in a k8s pod), it is possible to check this value
- UID - real user id (in host user namespace) of the calling process
- EVENT - identifies the event (e.g. syscall name)
- COMM - name of the calling process
- PID - pid of the calling process
- TID - tid of the calling thread
- PPID - parent pid of the calling process
- RET - value returned by the function
- ARGS - list of arguments given
Note about string arguments and userspace pointers: as pointers are being dereferenced from userspace memory, a malicious program may change the content being read before it actually gets executed in the kernel. Take this into account when doing security related stuff.
Tracee currently supports a subset of system calls events, which can be listed with:
./start.py -l
Other supported events are (functions called in kernel space):
- cap_capable - indicates which capabilities were requested
- do_exit - indicates exited processes
Adding new events (especially system calls) to Tracee is straightforward, but one should keep in mind that tracing too many events may cause system performance degradation. Other than that, high event rate can cause samples to be lost (an error message will then be shown as part of the output). For this reason, read and write syscalls are deliberately excluded from Tracee.
- Add envp to execve(at) syscalls
- Add full sockaddr struct fields to: "connect", "accept", "bind", "getsockname"
- Consider tracing commit_creds to detect potential kernel exploits
- Consider re-writing userspace side (python) in golang
- Pathname is missing in execve(at) syscalls - Issue #2627 in BCC project
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