104 lines
2.8 KiB
Go
104 lines
2.8 KiB
Go
package apparmor
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import (
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"fmt"
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"io/ioutil"
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"os"
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"os/exec"
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"path"
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)
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const DefaultProfilePath = "/etc/apparmor.d/docker"
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const DefaultProfile = `
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# AppArmor profile from lxc for containers.
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@{HOME}=@{HOMEDIRS}/*/ /root/
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@{HOMEDIRS}=/home/
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#@{HOMEDIRS}+=
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@{multiarch}=*-linux-gnu*
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@{PROC}=/proc/
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profile docker-default flags=(attach_disconnected,mediate_deleted) {
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network,
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capability,
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file,
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umount,
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# ignore DENIED message on / remount
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deny mount options=(ro, remount) -> /,
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# allow tmpfs mounts everywhere
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mount fstype=tmpfs,
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# allow mqueue mounts everywhere
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mount fstype=mqueue,
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# allow fuse mounts everywhere
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mount fstype=fuse.*,
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# allow bind mount of /lib/init/fstab for lxcguest
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mount options=(rw, bind) /lib/init/fstab.lxc/ -> /lib/init/fstab/,
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# deny writes in /proc/sys/fs but allow binfmt_misc to be mounted
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mount fstype=binfmt_misc -> /proc/sys/fs/binfmt_misc/,
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deny @{PROC}/sys/fs/** wklx,
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# allow efivars to be mounted, writing to it will be blocked though
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mount fstype=efivarfs -> /sys/firmware/efi/efivars/,
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# block some other dangerous paths
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deny @{PROC}/sysrq-trigger rwklx,
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deny @{PROC}/mem rwklx,
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deny @{PROC}/kmem rwklx,
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deny @{PROC}/sys/kernel/[^s][^h][^m]* wklx,
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deny @{PROC}/sys/kernel/*/** wklx,
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# deny writes in /sys except for /sys/fs/cgroup, also allow
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# fusectl, securityfs and debugfs to be mounted there (read-only)
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mount fstype=fusectl -> /sys/fs/fuse/connections/,
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mount fstype=securityfs -> /sys/kernel/security/,
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mount fstype=debugfs -> /sys/kernel/debug/,
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deny mount fstype=debugfs -> /var/lib/ureadahead/debugfs/,
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mount fstype=proc -> /proc/,
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mount fstype=sysfs -> /sys/,
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deny /sys/[^f]*/** wklx,
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deny /sys/f[^s]*/** wklx,
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deny /sys/fs/[^c]*/** wklx,
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deny /sys/fs/c[^g]*/** wklx,
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deny /sys/fs/cg[^r]*/** wklx,
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deny /sys/firmware/efi/efivars/** rwklx,
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deny /sys/kernel/security/** rwklx,
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mount options=(move) /sys/fs/cgroup/cgmanager/ -> /sys/fs/cgroup/cgmanager.lower/,
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# the container may never be allowed to mount devpts. If it does, it
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# will remount the host's devpts. We could allow it to do it with
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# the newinstance option (but, right now, we don't).
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deny mount fstype=devpts,
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}
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`
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func InstallDefaultProfile() error {
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if !IsEnabled() {
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return nil
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}
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// If the profile already exists, let it be.
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if _, err := os.Stat(DefaultProfilePath); err == nil {
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return nil
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}
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// Make sure /etc/apparmor.d exists
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if err := os.MkdirAll(path.Dir(DefaultProfilePath), 0755); err != nil {
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return err
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}
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if err := ioutil.WriteFile(DefaultProfilePath, []byte(DefaultProfile), 0644); err != nil {
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return err
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}
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output, err := exec.Command("/lib/init/apparmor-profile-load", "docker").CombinedOutput()
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if err != nil {
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return fmt.Errorf("Error loading docker profile: %s (%s)", err, output)
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}
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return nil
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}
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