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4c43566925
docker will run the process(es) within the container with an SELinux label and will label all of the content within the container with mount label. Any temporary file systems created within the container need to be mounted with the same mount label. The user can override the process label by specifying -Z With a string of space separated options. -Z "user=unconfined_u role=unconfined_r type=unconfined_t level=s0" Would cause the process label to run with unconfined_u:unconfined_r:unconfined_t:s0" By default the processes will run execute within the container as svirt_lxc_net_t. All of the content in the container as svirt_sandbox_file_t. The process mcs level is based of the PID of the docker process that is creating the container. If you run the container in --priv mode, the labeling will be disabled. Docker-DCO-1.1-Signed-off-by: Dan Walsh <dwalsh@redhat.com> (github: rhatdan)
171 lines
4.5 KiB
Go
171 lines
4.5 KiB
Go
package lxc
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import (
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"github.com/dotcloud/docker/pkg/label"
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"github.com/dotcloud/docker/runtime/execdriver"
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"strings"
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"text/template"
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)
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const LxcTemplate = `
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{{if .Network.Interface}}
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# network configuration
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lxc.network.type = veth
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lxc.network.link = {{.Network.Interface.Bridge}}
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lxc.network.name = eth0
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{{else}}
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# network is disabled (-n=false)
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lxc.network.type = empty
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lxc.network.flags = up
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{{end}}
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lxc.network.mtu = {{.Network.Mtu}}
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# root filesystem
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{{$ROOTFS := .Rootfs}}
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lxc.rootfs = {{$ROOTFS}}
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# use a dedicated pts for the container (and limit the number of pseudo terminal
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# available)
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lxc.pts = 1024
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# disable the main console
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lxc.console = none
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{{if getProcessLabel .Context}}
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lxc.se_context = {{ getProcessLabel .Context}}
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{{$MOUNTLABEL := getMountLabel .Context}}
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{{end}}
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# no controlling tty at all
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lxc.tty = 1
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{{if .Privileged}}
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lxc.cgroup.devices.allow = a
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{{else}}
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# no implicit access to devices
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lxc.cgroup.devices.deny = a
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# /dev/null and zero
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lxc.cgroup.devices.allow = c 1:3 rwm
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lxc.cgroup.devices.allow = c 1:5 rwm
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# consoles
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lxc.cgroup.devices.allow = c 5:1 rwm
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lxc.cgroup.devices.allow = c 5:0 rwm
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lxc.cgroup.devices.allow = c 4:0 rwm
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lxc.cgroup.devices.allow = c 4:1 rwm
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# /dev/urandom,/dev/random
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lxc.cgroup.devices.allow = c 1:9 rwm
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lxc.cgroup.devices.allow = c 1:8 rwm
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# /dev/pts/ - pts namespaces are "coming soon"
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lxc.cgroup.devices.allow = c 136:* rwm
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lxc.cgroup.devices.allow = c 5:2 rwm
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# tuntap
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lxc.cgroup.devices.allow = c 10:200 rwm
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# fuse
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#lxc.cgroup.devices.allow = c 10:229 rwm
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# rtc
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#lxc.cgroup.devices.allow = c 254:0 rwm
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{{end}}
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# standard mount point
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# Use mnt.putold as per https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/986385
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lxc.pivotdir = lxc_putold
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# NOTICE: These mounts must be applied within the namespace
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# WARNING: procfs is a known attack vector and should probably be disabled
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# if your userspace allows it. eg. see http://blog.zx2c4.com/749
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lxc.mount.entry = proc {{escapeFstabSpaces $ROOTFS}}/proc proc nosuid,nodev,noexec 0 0
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# WARNING: sysfs is a known attack vector and should probably be disabled
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# if your userspace allows it. eg. see http://bit.ly/T9CkqJ
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lxc.mount.entry = sysfs {{escapeFstabSpaces $ROOTFS}}/sys sysfs nosuid,nodev,noexec 0 0
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{{if .Tty}}
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lxc.mount.entry = {{.Console}} {{escapeFstabSpaces $ROOTFS}}/dev/console none bind,rw 0 0
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{{end}}
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lxc.mount.entry = devpts {{escapeFstabSpaces $ROOTFS}}/dev/pts devpts {{formatMountLabel "newinstance,ptmxmode=0666,nosuid,noexec" "$MOUNTLABEL"}} 0 0
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lxc.mount.entry = shm {{escapeFstabSpaces $ROOTFS}}/dev/shm tmpfs {{formatMountLabel "size=65536k,nosuid,nodev,noexec" "$MOUNTLABEL"}} 0 0
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{{range $value := .Mounts}}
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{{if $value.Writable}}
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lxc.mount.entry = {{$value.Source}} {{escapeFstabSpaces $ROOTFS}}/{{escapeFstabSpaces $value.Destination}} none bind,rw 0 0
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{{else}}
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lxc.mount.entry = {{$value.Source}} {{escapeFstabSpaces $ROOTFS}}/{{escapeFstabSpaces $value.Destination}} none bind,ro 0 0
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{{end}}
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{{end}}
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{{if .Privileged}}
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{{if .AppArmor}}
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lxc.aa_profile = unconfined
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{{else}}
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#lxc.aa_profile = unconfined
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{{end}}
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{{end}}
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# limits
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{{if .Resources}}
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{{if .Resources.Memory}}
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lxc.cgroup.memory.limit_in_bytes = {{.Resources.Memory}}
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lxc.cgroup.memory.soft_limit_in_bytes = {{.Resources.Memory}}
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{{with $memSwap := getMemorySwap .Resources}}
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lxc.cgroup.memory.memsw.limit_in_bytes = {{$memSwap}}
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{{end}}
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{{end}}
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{{if .Resources.CpuShares}}
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lxc.cgroup.cpu.shares = {{.Resources.CpuShares}}
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{{end}}
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{{end}}
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{{if .Config}}
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{{range $value := .Config}}
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{{$value}}
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{{end}}
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{{end}}
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`
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var LxcTemplateCompiled *template.Template
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// Escape spaces in strings according to the fstab documentation, which is the
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// format for "lxc.mount.entry" lines in lxc.conf. See also "man 5 fstab".
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func escapeFstabSpaces(field string) string {
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return strings.Replace(field, " ", "\\040", -1)
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}
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func getMemorySwap(v *execdriver.Resources) int64 {
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// By default, MemorySwap is set to twice the size of RAM.
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// If you want to omit MemorySwap, set it to `-1'.
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if v.MemorySwap < 0 {
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return 0
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}
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return v.Memory * 2
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}
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func getProcessLabel(c execdriver.Context) string {
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return c["process_label"]
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}
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func getMountLabel(c execdriver.Context) string {
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return c["mount_label"]
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}
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func init() {
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var err error
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funcMap := template.FuncMap{
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"getMemorySwap": getMemorySwap,
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"getProcessLabel": getProcessLabel,
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"getMountLabel": getMountLabel,
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"escapeFstabSpaces": escapeFstabSpaces,
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"formatMountLabel": label.FormatMountLabel,
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}
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LxcTemplateCompiled, err = template.New("lxc").Funcs(funcMap).Parse(LxcTemplate)
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if err != nil {
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panic(err)
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}
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}
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