profiles/apparmor/template.go

//go:build linux

package apparmor // import "github.com/docker/docker/profiles/apparmor"

// NOTE: This profile is replicated in containerd and libpod. If you make a
//       change to this profile, please make follow-up PRs to those projects so
//       that these rules can be synchronised (because any issue with this
//       profile will likely affect libpod and containerd).
// TODO: Move this to a common project so we can maintain it in one spot.

// baseTemplate defines the default apparmor profile for containers.
const baseTemplate = `
{{range $value := .Imports}}
{{$value}}
{{end}}

profile {{.Name}} flags=(attach_disconnected,mediate_deleted) {
{{range $value := .InnerImports}}
  {{$value}}
{{end}}

  network,
  capability,
  file,
  umount,
  # Host (privileged) processes may send signals to container processes.
  signal (receive) peer=unconfined,
  # runc may send signals to container processes (for "docker stop").
  signal (receive) peer=runc,
  # crun may send signals to container processes (for "docker stop" when used with crun OCI runtime).
  signal (receive) peer=crun,
  # dockerd may send signals to container processes (for "docker kill").
  signal (receive) peer={{.DaemonProfile}},
  # Container processes may send signals amongst themselves.
  signal (send,receive) peer={{.Name}},

  deny @{PROC}/* w,   # deny write for all files directly in /proc (not in a subdir)
  # deny write to files not in /proc/<number>/** or /proc/sys/**
  deny @{PROC}/{[^1-9],[^1-9][^0-9],[^1-9s][^0-9y][^0-9s],[^1-9][^0-9][^0-9][^0-9/]*}/** w,
  deny @{PROC}/sys/[^k]** w,  # deny /proc/sys except /proc/sys/k* (effectively /proc/sys/kernel)
  deny @{PROC}/sys/kernel/{?,??,[^s][^h][^m]**} w,  # deny everything except shm* in /proc/sys/kernel/
  deny @{PROC}/sysrq-trigger rwklx,
  deny @{PROC}/kcore rwklx,

  deny mount,

  deny /sys/[^f]*/** wklx,
  deny /sys/f[^s]*/** wklx,
  deny /sys/fs/[^c]*/** wklx,
  deny /sys/fs/c[^g]*/** wklx,
  deny /sys/fs/cg[^r]*/** wklx,
  deny /sys/firmware/** rwklx,
  deny /sys/devices/virtual/powercap/** rwklx,
  deny /sys/kernel/security/** rwklx,

  # suppress ptrace denials when using 'docker ps' or using 'ps' inside a container
  ptrace (trace,read,tracedby,readby) peer={{.Name}},
}
`