Merge pull request #5411 from crosbymichael/lockdown
Update default restrictions for exec drivers
This commit is contained in:
unclejack
commit
3a8c935a4d
17 changed files with 733 additions and 412 deletions
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@ -16,76 +16,149 @@ process are specified in this file. The configuration is used for each process
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Sample `container.json` file:
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```json
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{
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"mounts" : [
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{
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"type" : "devtmpfs"
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}
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],
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"tty" : true,
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"environment" : [
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"HOME=/",
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"PATH=PATH=$PATH:/bin:/usr/bin:/sbin:/usr/sbin",
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"container=docker",
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"TERM=xterm-256color"
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],
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"hostname" : "koye",
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"cgroups" : {
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"parent" : "docker",
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"name" : "docker-koye"
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},
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"capabilities_mask" : [
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{
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"value" : 8,
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"key" : "SETPCAP",
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"enabled" : false
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},
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{
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"enabled" : false,
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"value" : 16,
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"key" : "SYS_MODULE"
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},
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{
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"value" : 17,
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"key" : "SYS_RAWIO",
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"enabled" : false
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},
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{
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"key" : "SYS_PACCT",
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"value" : 20,
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"enabled" : false
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},
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{
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"value" : 21,
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"key" : "SYS_ADMIN",
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"enabled" : false
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},
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{
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"value" : 23,
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"key" : "SYS_NICE",
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"enabled" : false
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},
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{
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"value" : 24,
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"key" : "SYS_RESOURCE",
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"enabled" : false
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},
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{
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"key" : "SYS_TIME",
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"value" : 25,
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"enabled" : false
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},
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{
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"enabled" : false,
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"value" : 26,
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"key" : "SYS_TTY_CONFIG"
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},
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{
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"key" : "AUDIT_WRITE",
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"value" : 29,
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"enabled" : false
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},
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{
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"value" : 30,
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"key" : "AUDIT_CONTROL",
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"enabled" : false
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},
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{
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"enabled" : false,
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"key" : "MAC_OVERRIDE",
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"value" : 32
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},
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{
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"enabled" : false,
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"key" : "MAC_ADMIN",
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"value" : 33
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},
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{
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"key" : "NET_ADMIN",
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"value" : 12,
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"enabled" : false
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},
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{
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"value" : 27,
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"key" : "MKNOD",
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"enabled" : true
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}
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],
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"networks" : [
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{
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"gateway" : "172.17.42.1",
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"mtu" : 1500,
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"address" : "127.0.0.1/0",
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"type" : "loopback",
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"gateway" : "localhost"
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},
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{
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"mtu" : 1500,
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"address" : "172.17.42.2/16",
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"type" : "veth",
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"context" : {
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"bridge" : "docker0",
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"prefix" : "veth"
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},
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"address" : "172.17.0.2/16",
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"type" : "veth",
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"mtu" : 1500
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}
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],
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"cgroups" : {
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"parent" : "docker",
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"name" : "11bb30683fb0bdd57fab4d3a8238877f1e4395a2cfc7320ea359f7a02c1a5620"
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},
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"tty" : true,
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"environment" : [
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"HOME=/",
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"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
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"HOSTNAME=11bb30683fb0",
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"TERM=xterm"
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],
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"capabilities_mask" : [
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"SETPCAP",
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"SYS_MODULE",
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"SYS_RAWIO",
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"SYS_PACCT",
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"SYS_ADMIN",
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"SYS_NICE",
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"SYS_RESOURCE",
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"SYS_TIME",
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"SYS_TTY_CONFIG",
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"MKNOD",
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"AUDIT_WRITE",
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"AUDIT_CONTROL",
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"MAC_OVERRIDE",
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"MAC_ADMIN",
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"NET_ADMIN"
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],
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"context" : {
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"apparmor_profile" : "docker-default"
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},
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"mounts" : [
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{
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"source" : "/var/lib/docker/containers/11bb30683fb0bdd57fab4d3a8238877f1e4395a2cfc7320ea359f7a02c1a5620/resolv.conf",
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"writable" : false,
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"destination" : "/etc/resolv.conf",
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"private" : true
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},
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{
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"source" : "/var/lib/docker/containers/11bb30683fb0bdd57fab4d3a8238877f1e4395a2cfc7320ea359f7a02c1a5620/hostname",
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"writable" : false,
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"destination" : "/etc/hostname",
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"private" : true
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},
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{
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"source" : "/var/lib/docker/containers/11bb30683fb0bdd57fab4d3a8238877f1e4395a2cfc7320ea359f7a02c1a5620/hosts",
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"writable" : false,
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"destination" : "/etc/hosts",
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"private" : true
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"gateway" : "172.17.42.1"
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}
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],
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"namespaces" : [
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"NEWNS",
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"NEWUTS",
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"NEWIPC",
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"NEWPID",
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"NEWNET"
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{
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"key" : "NEWNS",
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"value" : 131072,
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"enabled" : true,
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"file" : "mnt"
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},
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{
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"key" : "NEWUTS",
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"value" : 67108864,
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"enabled" : true,
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"file" : "uts"
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},
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{
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"enabled" : true,
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"file" : "ipc",
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"key" : "NEWIPC",
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"value" : 134217728
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},
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{
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"file" : "pid",
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"enabled" : true,
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"value" : 536870912,
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"key" : "NEWPID"
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},
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{
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"enabled" : true,
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"file" : "net",
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"key" : "NEWNET",
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"value" : 1073741824
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}
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]
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}
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```
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60
libcontainer/console/console.go
Normal file
60
libcontainer/console/console.go
Normal file
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@ -0,0 +1,60 @@
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// +build linux
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package console
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import (
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"fmt"
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"github.com/dotcloud/docker/pkg/label"
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"github.com/dotcloud/docker/pkg/system"
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"os"
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"path/filepath"
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"syscall"
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)
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// Setup initializes the proper /dev/console inside the rootfs path
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func Setup(rootfs, consolePath, mountLabel string) error {
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oldMask := system.Umask(0000)
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defer system.Umask(oldMask)
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stat, err := os.Stat(consolePath)
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if err != nil {
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return fmt.Errorf("stat console %s %s", consolePath, err)
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}
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var (
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st = stat.Sys().(*syscall.Stat_t)
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dest = filepath.Join(rootfs, "dev/console")
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)
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if err := os.Remove(dest); err != nil && !os.IsNotExist(err) {
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return fmt.Errorf("remove %s %s", dest, err)
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}
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if err := os.Chmod(consolePath, 0600); err != nil {
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return err
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}
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if err := os.Chown(consolePath, 0, 0); err != nil {
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return err
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}
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if err := system.Mknod(dest, (st.Mode&^07777)|0600, int(st.Rdev)); err != nil {
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return fmt.Errorf("mknod %s %s", dest, err)
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}
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if err := label.SetFileLabel(consolePath, mountLabel); err != nil {
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return fmt.Errorf("set file label %s %s", dest, err)
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}
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if err := system.Mount(consolePath, dest, "bind", syscall.MS_BIND, ""); err != nil {
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return fmt.Errorf("bind %s to %s %s", consolePath, dest, err)
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}
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return nil
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}
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func OpenAndDup(consolePath string) error {
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slave, err := system.OpenTerminal(consolePath, syscall.O_RDWR)
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if err != nil {
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return fmt.Errorf("open terminal %s", err)
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}
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if err := system.Dup2(slave.Fd(), 0); err != nil {
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return err
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}
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if err := system.Dup2(slave.Fd(), 1); err != nil {
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return err
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}
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return system.Dup2(slave.Fd(), 2)
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}
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@ -23,7 +23,7 @@ type Container struct {
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Networks []*Network `json:"networks,omitempty"` // nil for host's network stack
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Cgroups *cgroups.Cgroup `json:"cgroups,omitempty"` // cgroups
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Context Context `json:"context,omitempty"` // generic context for specific options (apparmor, selinux)
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Mounts []Mount `json:"mounts,omitempty"`
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Mounts Mounts `json:"mounts,omitempty"`
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}
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// Network defines configuration for a container's networking stack
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@ -37,12 +37,3 @@ type Network struct {
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Gateway string `json:"gateway,omitempty"`
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Mtu int `json:"mtu,omitempty"`
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}
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// Bind mounts from the host system to the container
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//
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type Mount struct {
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Source string `json:"source"` // Source path, in the host namespace
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Destination string `json:"destination"` // Destination path, in the container
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Writable bool `json:"writable"`
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Private bool `json:"private"`
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}
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|
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@ -1,50 +1,146 @@
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{
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"hostname": "koye",
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"tty": true,
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"environment": [
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"HOME=/",
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"PATH=PATH=$PATH:/bin:/usr/bin:/sbin:/usr/sbin",
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"container=docker",
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"TERM=xterm-256color"
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],
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"namespaces": [
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"NEWIPC",
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"NEWNS",
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"NEWPID",
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"NEWUTS",
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"NEWNET"
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],
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"capabilities_mask": [
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"SETPCAP",
|
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"SYS_MODULE",
|
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"SYS_RAWIO",
|
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"SYS_PACCT",
|
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"SYS_ADMIN",
|
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"SYS_NICE",
|
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"SYS_RESOURCE",
|
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"SYS_TIME",
|
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"SYS_TTY_CONFIG",
|
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"MKNOD",
|
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"AUDIT_WRITE",
|
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"AUDIT_CONTROL",
|
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"MAC_OVERRIDE",
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"MAC_ADMIN",
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"NET_ADMIN"
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],
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"networks": [{
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"type": "veth",
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"context": {
|
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"bridge": "docker0",
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"prefix": "dock"
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},
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"address": "172.17.0.100/16",
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"gateway": "172.17.42.1",
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"mtu": 1500
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}
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],
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"cgroups": {
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"name": "docker-koye",
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"parent": "docker",
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"memory": 5248000
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}
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"mounts" : [
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{
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"type" : "devtmpfs"
|
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}
|
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],
|
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"tty" : true,
|
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"environment" : [
|
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"HOME=/",
|
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"PATH=PATH=$PATH:/bin:/usr/bin:/sbin:/usr/sbin",
|
||||
"container=docker",
|
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"TERM=xterm-256color"
|
||||
],
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"hostname" : "koye",
|
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"cgroups" : {
|
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"parent" : "docker",
|
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"name" : "docker-koye"
|
||||
},
|
||||
"capabilities_mask" : [
|
||||
{
|
||||
"value" : 8,
|
||||
"key" : "SETPCAP",
|
||||
"enabled" : false
|
||||
},
|
||||
{
|
||||
"enabled" : false,
|
||||
"value" : 16,
|
||||
"key" : "SYS_MODULE"
|
||||
},
|
||||
{
|
||||
"value" : 17,
|
||||
"key" : "SYS_RAWIO",
|
||||
"enabled" : false
|
||||
},
|
||||
{
|
||||
"key" : "SYS_PACCT",
|
||||
"value" : 20,
|
||||
"enabled" : false
|
||||
},
|
||||
{
|
||||
"value" : 21,
|
||||
"key" : "SYS_ADMIN",
|
||||
"enabled" : false
|
||||
},
|
||||
{
|
||||
"value" : 23,
|
||||
"key" : "SYS_NICE",
|
||||
"enabled" : false
|
||||
},
|
||||
{
|
||||
"value" : 24,
|
||||
"key" : "SYS_RESOURCE",
|
||||
"enabled" : false
|
||||
},
|
||||
{
|
||||
"key" : "SYS_TIME",
|
||||
"value" : 25,
|
||||
"enabled" : false
|
||||
},
|
||||
{
|
||||
"enabled" : false,
|
||||
"value" : 26,
|
||||
"key" : "SYS_TTY_CONFIG"
|
||||
},
|
||||
{
|
||||
"key" : "AUDIT_WRITE",
|
||||
"value" : 29,
|
||||
"enabled" : false
|
||||
},
|
||||
{
|
||||
"value" : 30,
|
||||
"key" : "AUDIT_CONTROL",
|
||||
"enabled" : false
|
||||
},
|
||||
{
|
||||
"enabled" : false,
|
||||
"key" : "MAC_OVERRIDE",
|
||||
"value" : 32
|
||||
},
|
||||
{
|
||||
"enabled" : false,
|
||||
"key" : "MAC_ADMIN",
|
||||
"value" : 33
|
||||
},
|
||||
{
|
||||
"key" : "NET_ADMIN",
|
||||
"value" : 12,
|
||||
"enabled" : false
|
||||
},
|
||||
{
|
||||
"value" : 27,
|
||||
"key" : "MKNOD",
|
||||
"enabled" : true
|
||||
}
|
||||
],
|
||||
"networks" : [
|
||||
{
|
||||
"mtu" : 1500,
|
||||
"address" : "127.0.0.1/0",
|
||||
"type" : "loopback",
|
||||
"gateway" : "localhost"
|
||||
},
|
||||
{
|
||||
"mtu" : 1500,
|
||||
"address" : "172.17.42.2/16",
|
||||
"type" : "veth",
|
||||
"context" : {
|
||||
"bridge" : "docker0",
|
||||
"prefix" : "veth"
|
||||
},
|
||||
"gateway" : "172.17.42.1"
|
||||
}
|
||||
],
|
||||
"namespaces" : [
|
||||
{
|
||||
"key" : "NEWNS",
|
||||
"value" : 131072,
|
||||
"enabled" : true,
|
||||
"file" : "mnt"
|
||||
},
|
||||
{
|
||||
"key" : "NEWUTS",
|
||||
"value" : 67108864,
|
||||
"enabled" : true,
|
||||
"file" : "uts"
|
||||
},
|
||||
{
|
||||
"enabled" : true,
|
||||
"file" : "ipc",
|
||||
"key" : "NEWIPC",
|
||||
"value" : 134217728
|
||||
},
|
||||
{
|
||||
"file" : "pid",
|
||||
"enabled" : true,
|
||||
"value" : 536870912,
|
||||
"key" : "NEWPID"
|
||||
},
|
||||
{
|
||||
"enabled" : true,
|
||||
"file" : "net",
|
||||
"key" : "NEWNET",
|
||||
"value" : 1073741824
|
||||
}
|
||||
]
|
||||
}
|
||||
|
|
|
|||
143
libcontainer/mount/init.go
Normal file
143
libcontainer/mount/init.go
Normal file
|
|
@ -0,0 +1,143 @@
|
|||
// +build linux
|
||||
|
||||
package mount
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"github.com/dotcloud/docker/pkg/label"
|
||||
"github.com/dotcloud/docker/pkg/libcontainer"
|
||||
"github.com/dotcloud/docker/pkg/libcontainer/mount/nodes"
|
||||
"github.com/dotcloud/docker/pkg/libcontainer/security/restrict"
|
||||
"github.com/dotcloud/docker/pkg/system"
|
||||
"os"
|
||||
"path/filepath"
|
||||
"syscall"
|
||||
)
|
||||
|
||||
// default mount point flags
|
||||
const defaultMountFlags = syscall.MS_NOEXEC | syscall.MS_NOSUID | syscall.MS_NODEV
|
||||
|
||||
type mount struct {
|
||||
source string
|
||||
path string
|
||||
device string
|
||||
flags int
|
||||
data string
|
||||
}
|
||||
|
||||
// InitializeMountNamespace setups up the devices, mount points, and filesystems for use inside a
|
||||
// new mount namepsace
|
||||
func InitializeMountNamespace(rootfs, console string, container *libcontainer.Container) error {
|
||||
var (
|
||||
err error
|
||||
flag = syscall.MS_PRIVATE
|
||||
)
|
||||
if container.NoPivotRoot {
|
||||
flag = syscall.MS_SLAVE
|
||||
}
|
||||
if err := system.Mount("", "/", "", uintptr(flag|syscall.MS_REC), ""); err != nil {
|
||||
return fmt.Errorf("mounting / as slave %s", err)
|
||||
}
|
||||
if err := system.Mount(rootfs, rootfs, "bind", syscall.MS_BIND|syscall.MS_REC, ""); err != nil {
|
||||
return fmt.Errorf("mouting %s as bind %s", rootfs, err)
|
||||
}
|
||||
if err := mountSystem(rootfs, container); err != nil {
|
||||
return fmt.Errorf("mount system %s", err)
|
||||
}
|
||||
if err := setupBindmounts(rootfs, container.Mounts); err != nil {
|
||||
return fmt.Errorf("bind mounts %s", err)
|
||||
}
|
||||
if err := nodes.CopyN(rootfs, nodes.DefaultNodes); err != nil {
|
||||
return fmt.Errorf("copy dev nodes %s", err)
|
||||
}
|
||||
if restrictionPath := container.Context["restriction_path"]; restrictionPath != "" {
|
||||
if err := restrict.Restrict(rootfs, restrictionPath); err != nil {
|
||||
return fmt.Errorf("restrict %s", err)
|
||||
}
|
||||
}
|
||||
if err := SetupPtmx(rootfs, console, container.Context["mount_label"]); err != nil {
|
||||
return err
|
||||
}
|
||||
if err := system.Chdir(rootfs); err != nil {
|
||||
return fmt.Errorf("chdir into %s %s", rootfs, err)
|
||||
}
|
||||
|
||||
if container.NoPivotRoot {
|
||||
err = MsMoveRoot(rootfs)
|
||||
} else {
|
||||
err = PivotRoot(rootfs)
|
||||
}
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
if container.ReadonlyFs {
|
||||
if err := SetReadonly(); err != nil {
|
||||
return fmt.Errorf("set readonly %s", err)
|
||||
}
|
||||
}
|
||||
|
||||
system.Umask(0022)
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
// mountSystem sets up linux specific system mounts like sys, proc, shm, and devpts
|
||||
// inside the mount namespace
|
||||
func mountSystem(rootfs string, container *libcontainer.Container) error {
|
||||
for _, m := range newSystemMounts(rootfs, container.Context["mount_label"], container.Mounts) {
|
||||
if err := os.MkdirAll(m.path, 0755); err != nil && !os.IsExist(err) {
|
||||
return fmt.Errorf("mkdirall %s %s", m.path, err)
|
||||
}
|
||||
if err := system.Mount(m.source, m.path, m.device, uintptr(m.flags), m.data); err != nil {
|
||||
return fmt.Errorf("mounting %s into %s %s", m.source, m.path, err)
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func setupBindmounts(rootfs string, bindMounts libcontainer.Mounts) error {
|
||||
for _, m := range bindMounts.OfType("bind") {
|
||||
var (
|
||||
flags = syscall.MS_BIND | syscall.MS_REC
|
||||
dest = filepath.Join(rootfs, m.Destination)
|
||||
)
|
||||
if !m.Writable {
|
||||
flags = flags | syscall.MS_RDONLY
|
||||
}
|
||||
if err := system.Mount(m.Source, dest, "bind", uintptr(flags), ""); err != nil {
|
||||
return fmt.Errorf("mounting %s into %s %s", m.Source, dest, err)
|
||||
}
|
||||
if !m.Writable {
|
||||
if err := system.Mount(m.Source, dest, "bind", uintptr(flags|syscall.MS_REMOUNT), ""); err != nil {
|
||||
return fmt.Errorf("remounting %s into %s %s", m.Source, dest, err)
|
||||
}
|
||||
}
|
||||
if m.Private {
|
||||
if err := system.Mount("", dest, "none", uintptr(syscall.MS_PRIVATE), ""); err != nil {
|
||||
return fmt.Errorf("mounting %s private %s", dest, err)
|
||||
}
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// TODO: this is crappy right now and should be cleaned up with a better way of handling system and
|
||||
// standard bind mounts allowing them to be more dymanic
|
||||
func newSystemMounts(rootfs, mountLabel string, mounts libcontainer.Mounts) []mount {
|
||||
systemMounts := []mount{
|
||||
{source: "proc", path: filepath.Join(rootfs, "proc"), device: "proc", flags: defaultMountFlags},
|
||||
}
|
||||
|
||||
if len(mounts.OfType("devtmpfs")) == 1 {
|
||||
systemMounts = append(systemMounts, mount{source: "tmpfs", path: filepath.Join(rootfs, "dev"), device: "tmpfs", flags: syscall.MS_NOSUID | syscall.MS_STRICTATIME, data: "mode=755"})
|
||||
}
|
||||
systemMounts = append(systemMounts,
|
||||
mount{source: "shm", path: filepath.Join(rootfs, "dev", "shm"), device: "tmpfs", flags: defaultMountFlags, data: label.FormatMountLabel("mode=1777,size=65536k", mountLabel)},
|
||||
mount{source: "devpts", path: filepath.Join(rootfs, "dev", "pts"), device: "devpts", flags: syscall.MS_NOSUID | syscall.MS_NOEXEC, data: label.FormatMountLabel("newinstance,ptmxmode=0666,mode=620,gid=5", mountLabel)})
|
||||
|
||||
if len(mounts.OfType("sysfs")) == 1 {
|
||||
systemMounts = append(systemMounts, mount{source: "sysfs", path: filepath.Join(rootfs, "sys"), device: "sysfs", flags: defaultMountFlags})
|
||||
}
|
||||
return systemMounts
|
||||
}
|
||||
19
libcontainer/mount/msmoveroot.go
Normal file
19
libcontainer/mount/msmoveroot.go
Normal file
|
|
@ -0,0 +1,19 @@
|
|||
// +build linux
|
||||
|
||||
package mount
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"github.com/dotcloud/docker/pkg/system"
|
||||
"syscall"
|
||||
)
|
||||
|
||||
func MsMoveRoot(rootfs string) error {
|
||||
if err := system.Mount(rootfs, "/", "", syscall.MS_MOVE, ""); err != nil {
|
||||
return fmt.Errorf("mount move %s into / %s", rootfs, err)
|
||||
}
|
||||
if err := system.Chroot("."); err != nil {
|
||||
return fmt.Errorf("chroot . %s", err)
|
||||
}
|
||||
return system.Chdir("/")
|
||||
}
|
||||
49
libcontainer/mount/nodes/nodes.go
Normal file
49
libcontainer/mount/nodes/nodes.go
Normal file
|
|
@ -0,0 +1,49 @@
|
|||
// +build linux
|
||||
|
||||
package nodes
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"github.com/dotcloud/docker/pkg/system"
|
||||
"os"
|
||||
"path/filepath"
|
||||
"syscall"
|
||||
)
|
||||
|
||||
// Default list of device nodes to copy
|
||||
var DefaultNodes = []string{
|
||||
"null",
|
||||
"zero",
|
||||
"full",
|
||||
"random",
|
||||
"urandom",
|
||||
"tty",
|
||||
}
|
||||
|
||||
// CopyN copies the device node from the host into the rootfs
|
||||
func CopyN(rootfs string, nodesToCopy []string) error {
|
||||
oldMask := system.Umask(0000)
|
||||
defer system.Umask(oldMask)
|
||||
|
||||
for _, node := range nodesToCopy {
|
||||
if err := Copy(rootfs, node); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func Copy(rootfs, node string) error {
|
||||
stat, err := os.Stat(filepath.Join("/dev", node))
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
var (
|
||||
dest = filepath.Join(rootfs, "dev", node)
|
||||
st = stat.Sys().(*syscall.Stat_t)
|
||||
)
|
||||
if err := system.Mknod(dest, st.Mode, int(st.Rdev)); err != nil && !os.IsExist(err) {
|
||||
return fmt.Errorf("copy %s %s", node, err)
|
||||
}
|
||||
return nil
|
||||
}
|
||||
31
libcontainer/mount/pivotroot.go
Normal file
31
libcontainer/mount/pivotroot.go
Normal file
|
|
@ -0,0 +1,31 @@
|
|||
// +build linux
|
||||
|
||||
package mount
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"github.com/dotcloud/docker/pkg/system"
|
||||
"io/ioutil"
|
||||
"os"
|
||||
"path/filepath"
|
||||
"syscall"
|
||||
)
|
||||
|
||||
func PivotRoot(rootfs string) error {
|
||||
pivotDir, err := ioutil.TempDir(rootfs, ".pivot_root")
|
||||
if err != nil {
|
||||
return fmt.Errorf("can't create pivot_root dir %s", pivotDir, err)
|
||||
}
|
||||
if err := system.Pivotroot(rootfs, pivotDir); err != nil {
|
||||
return fmt.Errorf("pivot_root %s", err)
|
||||
}
|
||||
if err := system.Chdir("/"); err != nil {
|
||||
return fmt.Errorf("chdir / %s", err)
|
||||
}
|
||||
// path to pivot dir now changed, update
|
||||
pivotDir = filepath.Join("/", filepath.Base(pivotDir))
|
||||
if err := system.Unmount(pivotDir, syscall.MNT_DETACH); err != nil {
|
||||
return fmt.Errorf("unmount pivot_root dir %s", err)
|
||||
}
|
||||
return os.Remove(pivotDir)
|
||||
}
|
||||
26
libcontainer/mount/ptmx.go
Normal file
26
libcontainer/mount/ptmx.go
Normal file
|
|
@ -0,0 +1,26 @@
|
|||
// +build linux
|
||||
|
||||
package mount
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"github.com/dotcloud/docker/pkg/libcontainer/console"
|
||||
"os"
|
||||
"path/filepath"
|
||||
)
|
||||
|
||||
func SetupPtmx(rootfs, consolePath, mountLabel string) error {
|
||||
ptmx := filepath.Join(rootfs, "dev/ptmx")
|
||||
if err := os.Remove(ptmx); err != nil && !os.IsNotExist(err) {
|
||||
return err
|
||||
}
|
||||
if err := os.Symlink("pts/ptmx", ptmx); err != nil {
|
||||
return fmt.Errorf("symlink dev ptmx %s", err)
|
||||
}
|
||||
if consolePath != "" {
|
||||
if err := console.Setup(rootfs, consolePath, mountLabel); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
12
libcontainer/mount/readonly.go
Normal file
12
libcontainer/mount/readonly.go
Normal file
|
|
@ -0,0 +1,12 @@
|
|||
// +build linux
|
||||
|
||||
package mount
|
||||
|
||||
import (
|
||||
"github.com/dotcloud/docker/pkg/system"
|
||||
"syscall"
|
||||
)
|
||||
|
||||
func SetReadonly() error {
|
||||
return system.Mount("/", "/", "bind", syscall.MS_BIND|syscall.MS_REMOUNT|syscall.MS_RDONLY|syscall.MS_REC, "")
|
||||
}
|
||||
31
libcontainer/mount/remount.go
Normal file
31
libcontainer/mount/remount.go
Normal file
|
|
@ -0,0 +1,31 @@
|
|||
// +build linux
|
||||
|
||||
package mount
|
||||
|
||||
import (
|
||||
"github.com/dotcloud/docker/pkg/system"
|
||||
"syscall"
|
||||
)
|
||||
|
||||
func RemountProc() error {
|
||||
if err := system.Unmount("/proc", syscall.MNT_DETACH); err != nil {
|
||||
return err
|
||||
}
|
||||
if err := system.Mount("proc", "/proc", "proc", uintptr(defaultMountFlags), ""); err != nil {
|
||||
return err
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func RemountSys() error {
|
||||
if err := system.Unmount("/sys", syscall.MNT_DETACH); err != nil {
|
||||
if err != syscall.EINVAL {
|
||||
return err
|
||||
}
|
||||
} else {
|
||||
if err := system.Mount("sysfs", "/sys", "sysfs", uintptr(defaultMountFlags), ""); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
|
@ -6,6 +6,7 @@ import (
|
|||
"fmt"
|
||||
"github.com/dotcloud/docker/pkg/label"
|
||||
"github.com/dotcloud/docker/pkg/libcontainer"
|
||||
"github.com/dotcloud/docker/pkg/libcontainer/mount"
|
||||
"github.com/dotcloud/docker/pkg/system"
|
||||
"os"
|
||||
"path/filepath"
|
||||
|
|
@ -63,10 +64,10 @@ func (ns *linuxNs) ExecIn(container *libcontainer.Container, nspid int, args []s
|
|||
if err := system.Unshare(syscall.CLONE_NEWNS); err != nil {
|
||||
return -1, err
|
||||
}
|
||||
if err := remountProc(); err != nil {
|
||||
if err := mount.RemountProc(); err != nil {
|
||||
return -1, fmt.Errorf("remount proc %s", err)
|
||||
}
|
||||
if err := remountSys(); err != nil {
|
||||
if err := mount.RemountSys(); err != nil {
|
||||
return -1, fmt.Errorf("remount sys %s", err)
|
||||
}
|
||||
goto dropAndExec
|
||||
|
|
|
|||
|
|
@ -11,8 +11,10 @@ import (
|
|||
"github.com/dotcloud/docker/pkg/apparmor"
|
||||
"github.com/dotcloud/docker/pkg/label"
|
||||
"github.com/dotcloud/docker/pkg/libcontainer"
|
||||
"github.com/dotcloud/docker/pkg/libcontainer/capabilities"
|
||||
"github.com/dotcloud/docker/pkg/libcontainer/console"
|
||||
"github.com/dotcloud/docker/pkg/libcontainer/mount"
|
||||
"github.com/dotcloud/docker/pkg/libcontainer/network"
|
||||
"github.com/dotcloud/docker/pkg/libcontainer/security/capabilities"
|
||||
"github.com/dotcloud/docker/pkg/libcontainer/utils"
|
||||
"github.com/dotcloud/docker/pkg/system"
|
||||
"github.com/dotcloud/docker/pkg/user"
|
||||
|
|
@ -20,7 +22,7 @@ import (
|
|||
|
||||
// Init is the init process that first runs inside a new namespace to setup mounts, users, networking,
|
||||
// and other options required for the new container.
|
||||
func (ns *linuxNs) Init(container *libcontainer.Container, uncleanRootfs, console string, syncPipe *SyncPipe, args []string) error {
|
||||
func (ns *linuxNs) Init(container *libcontainer.Container, uncleanRootfs, consolePath string, syncPipe *SyncPipe, args []string) error {
|
||||
rootfs, err := utils.ResolveRootfs(uncleanRootfs)
|
||||
if err != nil {
|
||||
return err
|
||||
|
|
@ -36,20 +38,16 @@ func (ns *linuxNs) Init(container *libcontainer.Container, uncleanRootfs, consol
|
|||
ns.logger.Println("received context from parent")
|
||||
syncPipe.Close()
|
||||
|
||||
if console != "" {
|
||||
ns.logger.Printf("setting up %s as console\n", console)
|
||||
slave, err := system.OpenTerminal(console, syscall.O_RDWR)
|
||||
if err != nil {
|
||||
return fmt.Errorf("open terminal %s", err)
|
||||
}
|
||||
if err := dupSlave(slave); err != nil {
|
||||
return fmt.Errorf("dup2 slave %s", err)
|
||||
if consolePath != "" {
|
||||
ns.logger.Printf("setting up %s as console\n", consolePath)
|
||||
if err := console.OpenAndDup(consolePath); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
if _, err := system.Setsid(); err != nil {
|
||||
return fmt.Errorf("setsid %s", err)
|
||||
}
|
||||
if console != "" {
|
||||
if consolePath != "" {
|
||||
if err := system.Setctty(); err != nil {
|
||||
return fmt.Errorf("setctty %s", err)
|
||||
}
|
||||
|
|
@ -60,7 +58,7 @@ func (ns *linuxNs) Init(container *libcontainer.Container, uncleanRootfs, consol
|
|||
|
||||
label.Init()
|
||||
ns.logger.Println("setup mount namespace")
|
||||
if err := setupNewMountNamespace(rootfs, container.Mounts, console, container.ReadonlyFs, container.NoPivotRoot, container.Context["mount_label"]); err != nil {
|
||||
if err := mount.InitializeMountNamespace(rootfs, consolePath, container); err != nil {
|
||||
return fmt.Errorf("setup mount namespace %s", err)
|
||||
}
|
||||
if err := system.Sethostname(container.Hostname); err != nil {
|
||||
|
|
@ -114,21 +112,6 @@ func setupUser(container *libcontainer.Container) error {
|
|||
return nil
|
||||
}
|
||||
|
||||
// dupSlave dup2 the pty slave's fd into stdout and stdin and ensures that
|
||||
// the slave's fd is 0, or stdin
|
||||
func dupSlave(slave *os.File) error {
|
||||
if err := system.Dup2(slave.Fd(), 0); err != nil {
|
||||
return err
|
||||
}
|
||||
if err := system.Dup2(slave.Fd(), 1); err != nil {
|
||||
return err
|
||||
}
|
||||
if err := system.Dup2(slave.Fd(), 2); err != nil {
|
||||
return err
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// setupVethNetwork uses the Network config if it is not nil to initialize
|
||||
// the new veth interface inside the container for use by changing the name to eth0
|
||||
// setting the MTU and IP address along with the default gateway
|
||||
|
|
|
|||
|
|
@ -1,265 +0,0 @@
|
|||
// +build linux
|
||||
|
||||
package nsinit
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"github.com/dotcloud/docker/pkg/label"
|
||||
"github.com/dotcloud/docker/pkg/libcontainer"
|
||||
"github.com/dotcloud/docker/pkg/system"
|
||||
"io/ioutil"
|
||||
"os"
|
||||
"path/filepath"
|
||||
"syscall"
|
||||
)
|
||||
|
||||
// default mount point flags
|
||||
const defaultMountFlags = syscall.MS_NOEXEC | syscall.MS_NOSUID | syscall.MS_NODEV
|
||||
|
||||
// setupNewMountNamespace is used to initialize a new mount namespace for an new
|
||||
// container in the rootfs that is specified.
|
||||
//
|
||||
// There is no need to unmount the new mounts because as soon as the mount namespace
|
||||
// is no longer in use, the mounts will be removed automatically
|
||||
func setupNewMountNamespace(rootfs string, bindMounts []libcontainer.Mount, console string, readonly, noPivotRoot bool, mountLabel string) error {
|
||||
flag := syscall.MS_PRIVATE
|
||||
if noPivotRoot {
|
||||
flag = syscall.MS_SLAVE
|
||||
}
|
||||
if err := system.Mount("", "/", "", uintptr(flag|syscall.MS_REC), ""); err != nil {
|
||||
return fmt.Errorf("mounting / as slave %s", err)
|
||||
}
|
||||
if err := system.Mount(rootfs, rootfs, "bind", syscall.MS_BIND|syscall.MS_REC, ""); err != nil {
|
||||
return fmt.Errorf("mouting %s as bind %s", rootfs, err)
|
||||
}
|
||||
if err := mountSystem(rootfs, mountLabel); err != nil {
|
||||
return fmt.Errorf("mount system %s", err)
|
||||
}
|
||||
|
||||
for _, m := range bindMounts {
|
||||
var (
|
||||
flags = syscall.MS_BIND | syscall.MS_REC
|
||||
dest = filepath.Join(rootfs, m.Destination)
|
||||
)
|
||||
if !m.Writable {
|
||||
flags = flags | syscall.MS_RDONLY
|
||||
}
|
||||
if err := system.Mount(m.Source, dest, "bind", uintptr(flags), ""); err != nil {
|
||||
return fmt.Errorf("mounting %s into %s %s", m.Source, dest, err)
|
||||
}
|
||||
if !m.Writable {
|
||||
if err := system.Mount(m.Source, dest, "bind", uintptr(flags|syscall.MS_REMOUNT), ""); err != nil {
|
||||
return fmt.Errorf("remounting %s into %s %s", m.Source, dest, err)
|
||||
}
|
||||
}
|
||||
if m.Private {
|
||||
if err := system.Mount("", dest, "none", uintptr(syscall.MS_PRIVATE), ""); err != nil {
|
||||
return fmt.Errorf("mounting %s private %s", dest, err)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if err := copyDevNodes(rootfs); err != nil {
|
||||
return fmt.Errorf("copy dev nodes %s", err)
|
||||
}
|
||||
if err := setupPtmx(rootfs, console, mountLabel); err != nil {
|
||||
return err
|
||||
}
|
||||
if err := system.Chdir(rootfs); err != nil {
|
||||
return fmt.Errorf("chdir into %s %s", rootfs, err)
|
||||
}
|
||||
|
||||
if noPivotRoot {
|
||||
if err := rootMsMove(rootfs); err != nil {
|
||||
return err
|
||||
}
|
||||
} else {
|
||||
if err := rootPivot(rootfs); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
|
||||
if readonly {
|
||||
if err := system.Mount("/", "/", "bind", syscall.MS_BIND|syscall.MS_REMOUNT|syscall.MS_RDONLY|syscall.MS_REC, ""); err != nil {
|
||||
return fmt.Errorf("mounting %s as readonly %s", rootfs, err)
|
||||
}
|
||||
}
|
||||
|
||||
system.Umask(0022)
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
// use a pivot root to setup the rootfs
|
||||
func rootPivot(rootfs string) error {
|
||||
pivotDir, err := ioutil.TempDir(rootfs, ".pivot_root")
|
||||
if err != nil {
|
||||
return fmt.Errorf("can't create pivot_root dir %s", pivotDir, err)
|
||||
}
|
||||
if err := system.Pivotroot(rootfs, pivotDir); err != nil {
|
||||
return fmt.Errorf("pivot_root %s", err)
|
||||
}
|
||||
if err := system.Chdir("/"); err != nil {
|
||||
return fmt.Errorf("chdir / %s", err)
|
||||
}
|
||||
// path to pivot dir now changed, update
|
||||
pivotDir = filepath.Join("/", filepath.Base(pivotDir))
|
||||
if err := system.Unmount(pivotDir, syscall.MNT_DETACH); err != nil {
|
||||
return fmt.Errorf("unmount pivot_root dir %s", err)
|
||||
}
|
||||
if err := os.Remove(pivotDir); err != nil {
|
||||
return fmt.Errorf("remove pivot_root dir %s", err)
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// use MS_MOVE and chroot to setup the rootfs
|
||||
func rootMsMove(rootfs string) error {
|
||||
if err := system.Mount(rootfs, "/", "", syscall.MS_MOVE, ""); err != nil {
|
||||
return fmt.Errorf("mount move %s into / %s", rootfs, err)
|
||||
}
|
||||
if err := system.Chroot("."); err != nil {
|
||||
return fmt.Errorf("chroot . %s", err)
|
||||
}
|
||||
if err := system.Chdir("/"); err != nil {
|
||||
return fmt.Errorf("chdir / %s", err)
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// copyDevNodes mknods the hosts devices so the new container has access to them
|
||||
func copyDevNodes(rootfs string) error {
|
||||
oldMask := system.Umask(0000)
|
||||
defer system.Umask(oldMask)
|
||||
|
||||
for _, node := range []string{
|
||||
"null",
|
||||
"zero",
|
||||
"full",
|
||||
"random",
|
||||
"urandom",
|
||||
"tty",
|
||||
} {
|
||||
if err := copyDevNode(rootfs, node); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func copyDevNode(rootfs, node string) error {
|
||||
stat, err := os.Stat(filepath.Join("/dev", node))
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
var (
|
||||
dest = filepath.Join(rootfs, "dev", node)
|
||||
st = stat.Sys().(*syscall.Stat_t)
|
||||
)
|
||||
if err := system.Mknod(dest, st.Mode, int(st.Rdev)); err != nil && !os.IsExist(err) {
|
||||
return fmt.Errorf("copy %s %s", node, err)
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// setupConsole ensures that the container has a proper /dev/console setup
|
||||
func setupConsole(rootfs, console string, mountLabel string) error {
|
||||
oldMask := system.Umask(0000)
|
||||
defer system.Umask(oldMask)
|
||||
|
||||
stat, err := os.Stat(console)
|
||||
if err != nil {
|
||||
return fmt.Errorf("stat console %s %s", console, err)
|
||||
}
|
||||
var (
|
||||
st = stat.Sys().(*syscall.Stat_t)
|
||||
dest = filepath.Join(rootfs, "dev/console")
|
||||
)
|
||||
if err := os.Remove(dest); err != nil && !os.IsNotExist(err) {
|
||||
return fmt.Errorf("remove %s %s", dest, err)
|
||||
}
|
||||
if err := os.Chmod(console, 0600); err != nil {
|
||||
return err
|
||||
}
|
||||
if err := os.Chown(console, 0, 0); err != nil {
|
||||
return err
|
||||
}
|
||||
if err := system.Mknod(dest, (st.Mode&^07777)|0600, int(st.Rdev)); err != nil {
|
||||
return fmt.Errorf("mknod %s %s", dest, err)
|
||||
}
|
||||
if err := label.SetFileLabel(console, mountLabel); err != nil {
|
||||
return fmt.Errorf("SetFileLabel Failed %s %s", dest, err)
|
||||
}
|
||||
if err := system.Mount(console, dest, "bind", syscall.MS_BIND, ""); err != nil {
|
||||
return fmt.Errorf("bind %s to %s %s", console, dest, err)
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// mountSystem sets up linux specific system mounts like sys, proc, shm, and devpts
|
||||
// inside the mount namespace
|
||||
func mountSystem(rootfs string, mountLabel string) error {
|
||||
for _, m := range []struct {
|
||||
source string
|
||||
path string
|
||||
device string
|
||||
flags int
|
||||
data string
|
||||
}{
|
||||
{source: "proc", path: filepath.Join(rootfs, "proc"), device: "proc", flags: defaultMountFlags},
|
||||
{source: "sysfs", path: filepath.Join(rootfs, "sys"), device: "sysfs", flags: defaultMountFlags},
|
||||
{source: "shm", path: filepath.Join(rootfs, "dev", "shm"), device: "tmpfs", flags: defaultMountFlags, data: label.FormatMountLabel("mode=1777,size=65536k", mountLabel)},
|
||||
{source: "devpts", path: filepath.Join(rootfs, "dev", "pts"), device: "devpts", flags: syscall.MS_NOSUID | syscall.MS_NOEXEC, data: label.FormatMountLabel("newinstance,ptmxmode=0666,mode=620,gid=5", mountLabel)},
|
||||
} {
|
||||
if err := os.MkdirAll(m.path, 0755); err != nil && !os.IsExist(err) {
|
||||
return fmt.Errorf("mkdirall %s %s", m.path, err)
|
||||
}
|
||||
if err := system.Mount(m.source, m.path, m.device, uintptr(m.flags), m.data); err != nil {
|
||||
return fmt.Errorf("mounting %s into %s %s", m.source, m.path, err)
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// setupPtmx adds a symlink to pts/ptmx for /dev/ptmx and
|
||||
// finishes setting up /dev/console
|
||||
func setupPtmx(rootfs, console string, mountLabel string) error {
|
||||
ptmx := filepath.Join(rootfs, "dev/ptmx")
|
||||
if err := os.Remove(ptmx); err != nil && !os.IsNotExist(err) {
|
||||
return err
|
||||
}
|
||||
if err := os.Symlink("pts/ptmx", ptmx); err != nil {
|
||||
return fmt.Errorf("symlink dev ptmx %s", err)
|
||||
}
|
||||
if console != "" {
|
||||
if err := setupConsole(rootfs, console, mountLabel); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// remountProc is used to detach and remount the proc filesystem
|
||||
// commonly needed with running a new process inside an existing container
|
||||
func remountProc() error {
|
||||
if err := system.Unmount("/proc", syscall.MNT_DETACH); err != nil {
|
||||
return err
|
||||
}
|
||||
if err := system.Mount("proc", "/proc", "proc", uintptr(defaultMountFlags), ""); err != nil {
|
||||
return err
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func remountSys() error {
|
||||
if err := system.Unmount("/sys", syscall.MNT_DETACH); err != nil {
|
||||
if err != syscall.EINVAL {
|
||||
return err
|
||||
}
|
||||
} else {
|
||||
if err := system.Mount("sysfs", "/sys", "sysfs", uintptr(defaultMountFlags), ""); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
51
libcontainer/security/restrict/restrict.go
Normal file
51
libcontainer/security/restrict/restrict.go
Normal file
|
|
@ -0,0 +1,51 @@
|
|||
package restrict
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"os"
|
||||
"path/filepath"
|
||||
"syscall"
|
||||
|
||||
"github.com/dotcloud/docker/pkg/system"
|
||||
)
|
||||
|
||||
const flags = syscall.MS_BIND | syscall.MS_REC | syscall.MS_RDONLY
|
||||
|
||||
var restrictions = map[string]string{
|
||||
// dirs
|
||||
"/proc/sys": "",
|
||||
"/proc/irq": "",
|
||||
"/proc/acpi": "",
|
||||
|
||||
// files
|
||||
"/proc/sysrq-trigger": "/dev/null",
|
||||
"/proc/kcore": "/dev/null",
|
||||
}
|
||||
|
||||
// Restrict locks down access to many areas of proc
|
||||
// by using the asumption that the user does not have mount caps to
|
||||
// revert the changes made here
|
||||
func Restrict(rootfs, empty string) error {
|
||||
for dest, source := range restrictions {
|
||||
dest = filepath.Join(rootfs, dest)
|
||||
|
||||
// we don't have a "/dev/null" for dirs so have the requester pass a dir
|
||||
// for us to bind mount
|
||||
switch source {
|
||||
case "":
|
||||
source = empty
|
||||
default:
|
||||
source = filepath.Join(rootfs, source)
|
||||
}
|
||||
if err := system.Mount(source, dest, "bind", flags, ""); err != nil {
|
||||
if os.IsNotExist(err) {
|
||||
continue
|
||||
}
|
||||
return fmt.Errorf("unable to mount %s over %s %s", source, dest, err)
|
||||
}
|
||||
if err := system.Mount("", dest, "bind", flags|syscall.MS_REMOUNT, ""); err != nil {
|
||||
return fmt.Errorf("unable to mount %s over %s %s", source, dest, err)
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
|
@ -11,6 +11,26 @@ var (
|
|||
ErrUnsupported = errors.New("Unsupported method")
|
||||
)
|
||||
|
||||
type Mounts []Mount
|
||||
|
||||
func (s Mounts) OfType(t string) Mounts {
|
||||
out := Mounts{}
|
||||
for _, m := range s {
|
||||
if m.Type == t {
|
||||
out = append(out, m)
|
||||
}
|
||||
}
|
||||
return out
|
||||
}
|
||||
|
||||
type Mount struct {
|
||||
Type string `json:"type,omitempty"`
|
||||
Source string `json:"source,omitempty"` // Source path, in the host namespace
|
||||
Destination string `json:"destination,omitempty"` // Destination path, in the container
|
||||
Writable bool `json:"writable,omitempty"`
|
||||
Private bool `json:"private,omitempty"`
|
||||
}
|
||||
|
||||
// namespaceList is used to convert the libcontainer types
|
||||
// into the names of the files located in /proc/<pid>/ns/* for
|
||||
// each namespace
|
||||
|
|
|
|||
Loading…
Reference in a new issue