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Use pam_namespaces and pam_exec to clean-up home dirs and temp space
Also DRY-up sysctl/pam code repeated in Kafka and Hadoop; should be in BCPC
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depends 'ntp' | ||
depends 'ubuntu' | ||
depends 'sudo' | ||
depends 'sysctl' | ||
depends 'pam' | ||
depends 'pdns' |
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# Chef recipe to implement pam_namespace polyinstantiated directories | ||
# This will provide users the appearance they are the only user with data | ||
# in the affected directories -- also this will clean-up their data when | ||
# leaving the machine | ||
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directory '/inst-dirs' do | ||
user 'root' | ||
group 'root' | ||
mode 0o000 | ||
end | ||
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directory '/usr/local/sbin' do | ||
action :create | ||
end | ||
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polyinstantion_dir = node['bcpc']['pam_namespace']['polyinstantion_dir'], | ||
shm_polyinstantion_dir = node['bcpc']['pam_namespace']['shm_polyinstantion_dir'] | ||
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template '/usr/local/sbin/inst_dir.sh' do | ||
source 'inst_dir.sh.erb' | ||
mode 500 | ||
variables(shm_polyinstantion_dir: shm_polyinstantion_dir, | ||
polyinstantion_dir: polyinstantion_dir) | ||
end | ||
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template '/etc/security/namespace.conf' do | ||
source 'pam_namespace.conf.erb' | ||
mode 500 | ||
variables(real_home_dir_users: | ||
node['bcpc']['pam_namespace']['real_home_dir_users'], | ||
shm_polyinstantion_dir: shm_polyinstantion_dir, | ||
polyinstantion_dir: polyinstantion_dir) | ||
end | ||
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# NOTE: This include_recipe is necessary for resource collection | ||
include_recipe 'sysctl::default' | ||
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# ensure we use /etc/security/limits.d to allow ulimit overriding | ||
if !node.key?('pam_d') || !node['pam_d'].key?('services') || !node['pam_d']['services'].key?('common-session') | ||
node.default['pam_d']['services'] = { | ||
'common-session' => { | ||
'main' => { | ||
'pam_permit_default' => { 'interface' => 'session', 'control_flag' => '[default=1]', 'name' => 'pam_permit.so' }, | ||
'pam_deny' => { 'interface' => 'session', 'control_flag' => 'requisite', 'name' => 'pam_deny.so' }, | ||
'pam_permit_required' => { 'interface' => 'session', 'control_flag' => 'required', 'name' => 'pam_permit.so' }, | ||
'pam_limits' => { 'interface' => 'session', 'control_flag' => 'required', 'name' => 'pam_limits.so' }, | ||
'pam_umask' => { 'interface' => 'session', 'control_flag' => 'optional', 'name' => 'pam_umask.so' }, | ||
'pam_unix' => { 'interface' => 'session', 'control_flag' => 'required', 'name' => 'pam_unix.so' }, | ||
'pam_exec' => { 'interface' => 'session', 'control_flag' => 'optional', 'name' => 'pam_exec.so', 'args' => '/usr/local/sbin/inst_dir.sh' }, | ||
'pam_namespace' => { 'interface' => 'session', 'control_flag' => 'required', 'name' => 'pam_namespace.so', 'args' => 'unmnt_remnt' }, | ||
}, | ||
'includes' => [] | ||
} | ||
} | ||
end | ||
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# set vm.swapiness to 0 (to lessen swapping) | ||
sysctl_param 'vm.swappiness' do | ||
value 0 | ||
end | ||
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#!/bin/bash | ||
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# This script is managed by Chef | ||
# It is designed to setup directories using pam_exec | ||
# for the pam_namespaces module to isolate user-direcotires | ||
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if [ -z "$PAM_TYPE" -o "$PAM_TYPE" == "open_session" ]; then | ||
# need to setup the polyinstantation directory for login | ||
mkdir -pm 000 /dev/shm/<%= @shm_polyinstantion_dir %> | ||
elif [ -z "$PAM_TYPE" -o "$PAM_TYPE" == "close_session" ]; then | ||
# see if user still has any prescence on this machine | ||
pgrep -u $PAM_USER && exit 0 | ||
# if no prescense of user, remove all trace of their activity | ||
rm -rf <%= @polyinstantion_dir %>/home_$PAM_USER \ | ||
<%= @polyinstantion_dir %>/tmp_$PAM_USER \ | ||
<%= @polyinstantion_dir %>/var_tmp_$PAM_USER \ | ||
/dev/shm/<%= @shm_polyinstantion_dir %>/inst_$PAM_USER | ||
fi | ||
exit 0 |
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# /etc/security/namespace.conf | ||
# | ||
############################# | ||
# This file managed by Chef # | ||
############################# | ||
# | ||
#masked mnt point real mnt point isolation-level excluded users | ||
/var/tmp <%= @polyinstantion_dir %>/var_tmp_ user root | ||
$HOME <%= @polyinstantion_dir %>/home_ user root,<%= @real_home_dir_users %> | ||
/tmp <%= @polyinstantion_dir %>/tmp_ user root | ||
/dev/shm /dev/shm/<%= @shm_polyinstantion_dir %>/inst_ user root |
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