podman/libpod: add default AppArmor profile

Make users of libpod more secure by adding the libpod/apparmor package
to load a pre-defined AppArmor profile.  Large chunks of libpod/apparmor
come from github.com/moby/moby.

Also check if a specified AppArmor profile is actually loaded and throw
an error if necessary.

The default profile is loaded only on Linux builds with the `apparmor`
buildtag enabled.

Signed-off-by: Valentin Rothberg <vrothberg@suse.com>

Closes: #1063
Approved by: rhatdan

1 files changed, 54 insertions, 0 deletions

diff --git a/pkg/apparmor/apparmor.go b/pkg/apparmor/apparmor.go
new file mode 100644
index 000000000..1c205f68a
--- /dev/null
+++ b/pkg/apparmor/apparmor.go
@@ -0,0 +1,54 @@
+package apparmor
+
+import (
+	"errors"
+)
+
+var (
+	// profileDirectory is the file store for apparmor profiles and macros.
+	profileDirectory = "/etc/apparmor.d"
+	// DefaultLibpodProfile is the name of default libpod AppArmor profile.
+	DefaultLibpodProfile = "libpod-default"
+	// ErrApparmorUnsupported indicates that AppArmor support is not supported.
+	ErrApparmorUnsupported = errors.New("AppArmor is not supported")
+)
+
+const libpodProfileTemplate = `
+{{range $value := .Imports}}
+{{$value}}
+{{end}}
+
+profile {{.Name}} flags=(attach_disconnected,mediate_deleted) {
+{{range $value := .InnerImports}}
+  {{$value}}
+{{end}}
+
+  network,
+  capability,
+  file,
+  umount,
+
+  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/kernel/security/** rwklx,
+
+{{if ge .Version 208095}}
+  # suppress ptrace denials when using using 'ps' inside a container
+  ptrace (trace,read) peer={{.Name}},
+{{end}}
+}
+`