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Add support to load a seccomp filter
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| package env | ||
|
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| import ( | ||
| "os" | ||
| "syscall" | ||
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| "github.com/elastic/go-seccomp-bpf" | ||
| "github.com/elastic/go-ucfg/yaml" | ||
| "golang.org/x/net/bpf" | ||
| ) | ||
|
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| func readSeccompConf(name string) ([]syscall.SockFilter, error) { | ||
| conf, err := yaml.NewConfigWithFile(name) | ||
| if err != nil { | ||
| if os.IsNotExist(err) { | ||
| return nil, nil | ||
| } | ||
| return nil, err | ||
| } | ||
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| var policy seccomp.Policy | ||
| if err := conf.Unpack(&policy); err != nil { | ||
| return nil, err | ||
| } | ||
| inst, err := policy.Assemble() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| rawInst, err := bpf.Assemble(inst) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return toSockFilter(rawInst), nil | ||
| } | ||
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| func toSockFilter(raw []bpf.RawInstruction) []syscall.SockFilter { | ||
| filter := make([]syscall.SockFilter, 0, len(raw)) | ||
| for _, instruction := range raw { | ||
| filter = append(filter, syscall.SockFilter{ | ||
| Code: instruction.Op, | ||
| Jt: instruction.Jt, | ||
| Jf: instruction.Jf, | ||
| K: instruction.K, | ||
| }) | ||
| } | ||
| return filter | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,154 @@ | ||
| # This is an example seccomp policy for x86_64 that whitelist regular syscalls and prevents network syscalls. | ||
| # The example is not ready for production use now, should be tuned for specific usages | ||
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| # The default action is applied if none of the syscalls match. | ||
| # | ||
| # Possible actions: | ||
| # - kill_process (since Linux 4.14) | ||
| # - kill_thread | ||
| # - trap | ||
| # - errno (returns EPERM) | ||
| # - trace | ||
| # - log (since Linux 4.14) | ||
| # - allow | ||
| default_action: kill_process | ||
|
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||
| syscalls: | ||
| - action: allow | ||
| names: | ||
| # file actions | ||
| - read | ||
| - write | ||
| - readv | ||
| - writev | ||
| - close | ||
| - fstat | ||
| - lseek | ||
| - dup | ||
| - dup2 | ||
| - dup3 | ||
| - ioctl | ||
| - fcntl | ||
| - fadvise64 | ||
| - pipe | ||
| - pread64 | ||
| - pwrite64 | ||
|
|
||
| # memory action | ||
| - mmap | ||
| - mprotect | ||
| - munmap | ||
| - brk | ||
| - mremap | ||
| - msync | ||
| - mincore | ||
| - madvise | ||
|
|
||
| # signal | ||
| - rt_sigaction | ||
| - rt_sigprocmask | ||
| - rt_sigreturn | ||
| - rt_sigpending | ||
| - sigaltstack | ||
|
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||
| # work dir | ||
| - getcwd | ||
|
|
||
| # exit | ||
| - exit | ||
| - exit_group | ||
|
|
||
| # others | ||
| - arch_prctl | ||
| - restart_syscall | ||
|
|
||
| # time | ||
| - gettimeofday | ||
| - times | ||
| - time | ||
| - clock_gettime | ||
| - clock_getres | ||
|
|
||
| # rlimit | ||
| - getrlimit | ||
| - getrusage | ||
| - setrlimit | ||
|
|
||
| # execve | ||
| - execve | ||
| - execveat | ||
|
|
||
| # open | ||
| - open | ||
| - openat | ||
|
|
||
| # delete | ||
| - unlink | ||
| - unlinkat | ||
|
|
||
| # link | ||
| - readlink | ||
| - readlinkat | ||
|
|
||
| # permission check | ||
| - lstat | ||
| - stat | ||
| - access | ||
| - faccessat | ||
|
|
||
| # process | ||
| - clone | ||
| - fork | ||
| - vfork | ||
| - nanosleep | ||
| - wait4 | ||
|
|
||
| - getpid | ||
| - gettid | ||
|
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||
| # lock | ||
| - futex | ||
|
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| # other | ||
| - getdents | ||
| - getdents64 | ||
| - sysinfo | ||
| - set_tid_address | ||
| - set_robust_list | ||
| - getrandom | ||
|
|
||
| - umask | ||
| - rename | ||
| - chmod | ||
| - mkdir | ||
| - chdir | ||
| - fchdir | ||
| - ftruncate | ||
| - sched_getaffinity | ||
| - sched_yield | ||
| - uname | ||
| - prlimit64 | ||
| - fchmodat | ||
| - poll | ||
|
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||
| # user | ||
| - getuid | ||
| - geteuid | ||
| - getgid | ||
| - getegid | ||
|
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| - action: errno | ||
| names: | ||
| - connect | ||
| - accept | ||
| - sendto | ||
| - recvfrom | ||
| - sendmsg | ||
| - recvmsg | ||
| - bind | ||
| - listen | ||
| - setsockopt | ||
| - socketpair | ||
| - getsockopt | ||
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