Merge pull request #486 from boltronics/truncate_config_on_update

* Fix catchall regex to avoid privilege escalation.
* Ref: https://github.com/fgrehm/vagrant-lxc/pull/483

.travis.yml

@@ -1,10 +1,10 @@
+---
 language: ruby
 rvm:
-  - 2.2
-  - 2.3
-  - 2.4
   - 2.5
+  - 2.6
+  - 2.7
 install:
-  - gem install -v 1.12.5 bundler
+  - gem install -v 1.16.2 bundler
-  - bundle _1.12.5_ install --jobs=3 --retry=3
+  - bundle _1.16.2_ install --jobs=3 --retry=3
 script: "bundle exec rake ci"

Gemfile

@@ -1,7 +1,7 @@
 source 'https://rubygems.org'
 
 group :development do
-  gem 'vagrant', git: 'https://github.com/mitchellh/vagrant.git'
+  gem 'vagrant', git: 'https://github.com/mitchellh/vagrant.git', branch: 'main'
   gem 'guard'
   gem 'guard-rspec'
   gem 'rb-inotify'
@@ -11,7 +11,7 @@ group :development, :test do
   gem 'rake', '~> 10.4.2'
   gem 'rspec', '~> 3.5.0'
   gem 'coveralls', '~> 0.7.2', require: (ENV['COVERAGE'] == 'true')
-  gem 'vagrant-spec', git: 'https://github.com/mitchellh/vagrant-spec.git'
+  gem 'vagrant-spec', git: 'https://github.com/mitchellh/vagrant-spec.git', branch: 'main'
 end
 
 group :plugins do

lib/vagrant-lxc/action/private_networks.rb

@@ -22,16 +22,17 @@ module Vagrant
         end
 
         def configure_private_networks(env)
-          env[:machine].config.vm.networks.find do |type, config|
+          env[:machine].config.vm.networks.find_all.each do |type, config|
             next if type.to_sym != :private_network
 
             container_name      = env[:machine].provider.driver.container_name
+            container_interface = config[:interface]
             address_type        = config[:type]
             ip                  = config[:ip]
             bridge_ip           = config.fetch(:lxc__bridge_ip) { build_bridge_ip(ip) }
             bridge              = config.fetch(:lxc__bridge_name)
 
-            env[:machine].provider.driver.configure_private_network(bridge, bridge_ip, container_name, address_type, ip)
+            env[:machine].provider.driver.configure_private_network(bridge, bridge_ip, container_name, container_interface, address_type, ip)
           end
         end
 

lib/vagrant-lxc/driver.rb

@@ -130,8 +130,11 @@ module Vagrant
         @cli.info(*command)
       end
 
-      def configure_private_network(bridge_name, bridge_ip, container_name, address_type, ip)
+      def configure_private_network(bridge_name, bridge_ip, container_name, container_interface, address_type, ip)
-        @logger.info "Configuring network interface for #{container_name} using #{ip} and bridge #{bridge_name}"
+        if ! container_interface
+          container_interface = "eth1"
+        end
+        @logger.info "Configuring network interface #{container_interface} for #{container_name} using #{ip} and bridge #{bridge_name}"
         if ip
           ip += '/24'
         end
@@ -170,6 +173,8 @@ module Vagrant
         cmd = [
           Vagrant::LXC.source_root.join('scripts/pipework').to_s,
           bridge_name,
+          "-i",
+          container_interface,
           container_name,
           ip ||= "dhcp"
         ]
@@ -270,7 +275,7 @@ module Vagrant
       def write_config(contents)
         confpath = base_path.join('config').to_s
         begin
-          File.open(confpath, File::RDWR) do |file|
+          File.open(confpath, File::WRONLY|File::TRUNC) do |file|
             file.write contents
           end
         rescue

lib/vagrant-lxc/version.rb

@@ -1,5 +1,5 @@
 module Vagrant
   module LXC
-    VERSION = "1.4.2"
+    VERSION = "1.4.3"
   end
 end

scripts/pipework

@@ -144,9 +144,12 @@ CONTAINER_IFNAME=${CONTAINER_IFNAME:-eth1}
 
 # Second step: find the guest (for now, we only support LXC containers)
 while read _ mnt fstype options _; do
-  [ "$fstype" != "cgroup" ] && continue
+  [ "$fstype" != "cgroup2" ] && [ "$fstype" != "cgroup" ] && continue
+  if [ "$fstype" = "cgroup" ]; then
     echo "$options" | grep -qw devices || continue
+  fi
   CGROUPMNT=$mnt
+  CGROUPTYPE=$fstype
 done < /proc/mounts
 
 [ "$CGROUPMNT" ] || {
@@ -154,7 +157,9 @@ done < /proc/mounts
 }
 
 # Try to find a cgroup matching exactly the provided name.
-N=$(find "$CGROUPMNT" -name "$GUESTNAME" | wc -l)
+[ "$CGROUPTYPE" = "cgroup" ] && N=$(find "$CGROUPMNT" -name "$GUESTNAME" | wc -l)
+[ "$CGROUPTYPE" = "cgroup2" ] && N=$(find "$CGROUPMNT" -name "lxc.payload.$GUESTNAME" | wc -l)
+
 case "$N" in
   0)
     # If we didn't find anything, try to lookup the container with Docker.
@@ -235,7 +240,8 @@ fi
 if [ "$DOCKERPID" ]; then
   NSPID=$DOCKERPID
 else
-  NSPID=$(head -n 1 "$(find "$CGROUPMNT" -name "$GUESTNAME" | head -n 1)/tasks")
+  NSPATH=$(find "$CGROUPMNT" -name "$GUESTNAME" | head -n 1)
+  [ -f "$NSPATH/tasks" ] && NSPID=$(head -n 1 "$NSPATH/tasks")
   [ "$NSPID" ] || {
     # it is an alternative way to get the pid
     NSPID=$(lxc-info -n  "$GUESTNAME" | grep PID | grep -Eo '[0-9]+')

templates/sudoers.rb.erb

@@ -79,7 +79,7 @@ class Whitelist
 end
 
 base = "<%= lxc_base_path %>"
-base_path = %r{\A#{base}/.*\z}
+base_path = %r{\A#{base}/[\ -_\/\.\d\w]+$\z}
 
 ##
 # Commands from provider.rb
@@ -93,11 +93,11 @@ Whitelist.add '<%= cmd_paths['cat'] %>', base_path
 # - Shared folders
 Whitelist.add '<%= cmd_paths['mkdir'] %>', '-p', base_path
 # - Container config customizations and pruning
-Whitelist.add '<%= cmd_paths['cp'] %>', '-f', %r{/tmp/.*}, base_path
+Whitelist.add '<%= cmd_paths['cp'] %>', '-f', %r{/tmp/[\ -_\/\.\d\w]+$}, base_path
 Whitelist.add '<%= cmd_paths['chown'] %>', 'root:root', base_path
 # - Packaging
-Whitelist.add '<%= cmd_paths['tar'] %>', '--numeric-owner', '-cvzf', %r{/tmp/.*/rootfs.tar.gz}, '-C', base_path, './rootfs'
+Whitelist.add '<%= cmd_paths['tar'] %>', '--numeric-owner', '-cvzf', %r{/tmp/^[\ -_\/\.\d\w]+$/rootfs.tar.gz}, '-C', base_path, './rootfs'
-Whitelist.add '<%= cmd_paths['chown'] %>', /\A\d+:\d+\z/, %r{\A/tmp/.*/rootfs\.tar\.gz\z}
+Whitelist.add '<%= cmd_paths['chown'] %>', /\A\d+:\d+\z/, %r{\A/tmp/^[\ -_\/\.\d\w]+$/rootfs\.tar\.gz\z}
 # - Private network script and commands
 Whitelist.add '<%= cmd_paths['ip'] %>', 'addr', 'add', /(\d+|\.)+\/24/, 'dev', /.+/
 Whitelist.add '<%= cmd_paths['ip'] %>', 'link', 'set', /.+/, /(up|down)/
@@ -108,22 +108,22 @@ Whitelist.add_regex %r{<%= pipework_regex %>}, '**'
 # Commands from driver/cli.rb
 Whitelist.add '<%= cmd_paths['lxc_bin'] %>/lxc-version'
 Whitelist.add '<%= cmd_paths['lxc_bin'] %>/lxc-ls'
-Whitelist.add '<%= cmd_paths['lxc_bin'] %>/lxc-info', '--name', /.*/
+Whitelist.add '<%= cmd_paths['lxc_bin'] %>/lxc-info', '--name', /^[\ -_\/\.\d\w]+$/
-Whitelist.add '<%= cmd_paths['lxc_bin'] %>/lxc-info', '--name', /.*/, '-iH'
+Whitelist.add '<%= cmd_paths['lxc_bin'] %>/lxc-info', '--name', /^[\ -_\/\.\d\w]+$/, '-iH'
-Whitelist.add '<%= cmd_paths['lxc_bin'] %>/lxc-create', '-B', /.*/, '--template', /.*/, '--name', /.*/, '**'
+Whitelist.add '<%= cmd_paths['lxc_bin'] %>/lxc-create', '-B', /^[\ -_\/\.\d\w]+$/, '--template', /^[\ -_\/\.\d\w]+$/, '--name', /^[\ -_\/\.\d\w]+$/, '**'
 Whitelist.add '<%= cmd_paths['lxc_bin'] %>/lxc-create', '--version'
-Whitelist.add '<%= cmd_paths['lxc_bin'] %>/lxc-destroy', '--name', /.*/
+Whitelist.add '<%= cmd_paths['lxc_bin'] %>/lxc-destroy', '--name', /^[\ -_\/\.\d\w]+$/
-Whitelist.add '<%= cmd_paths['lxc_bin'] %>/lxc-start', '-d', '--name', /.*/, '**'
+Whitelist.add '<%= cmd_paths['lxc_bin'] %>/lxc-start', '-d', '--name', /^[\ -_\/\.\d\w]+$/, '**'
-Whitelist.add '<%= cmd_paths['lxc_bin'] %>/lxc-stop', '--name', /.*/
+Whitelist.add '<%= cmd_paths['lxc_bin'] %>/lxc-stop', '--name', /^[\ -_\/\.\d\w]+$/
-Whitelist.add '<%= cmd_paths['lxc_bin'] %>/lxc-shutdown', '--name', /.*/
+Whitelist.add '<%= cmd_paths['lxc_bin'] %>/lxc-shutdown', '--name', /^[\ -_\/\.\d\w]+$/
-Whitelist.add '<%= cmd_paths['lxc_bin'] %>/lxc-attach', '--name', /.*/, '**'
+Whitelist.add '<%= cmd_paths['lxc_bin'] %>/lxc-attach', '--name', /^[\ -_\/\.\d\w]+$/, '**'
 Whitelist.add '<%= cmd_paths['lxc_bin'] %>/lxc-attach', '-h'
 Whitelist.add '<%= cmd_paths['lxc_bin'] %>/lxc-config', 'lxc.lxcpath'
-Whitelist.add '<%= cmd_paths['lxc_bin'] %>/lxc-update-config', '-c', /.*/
+Whitelist.add '<%= cmd_paths['lxc_bin'] %>/lxc-update-config', '-c', /^[\ -_\/\.\d\w]+$/
 
 ##
 # Commands from driver/action/remove_temporary_files.rb
-Whitelist.add '<%= cmd_paths['rm'] %>', '-rf', %r{\A#{base}/.*/rootfs/tmp/.*}
+Whitelist.add '<%= cmd_paths['rm'] %>', '-rf', %r{\A#{base}/^[\ -_\/\.\d\w]+$/rootfs/tmp/[\ -_\/\.\d\w]+$}
 
 # Watch out for stones
 Whitelist.run!(ARGV)