Ensure users' .netrc Files are not group or world accessible
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Description
While the system administrator can establish secure permissions for users’ .netrc files, the
users can easily override these.
This rule ensures every .netrc file or directory under the home directory related
to an interactive user is not group or world accessible
Rationale
.netrc files may contain unencrypted passwords that may be used to attack other systems.
Note: While the complete removal of .netrc files is recommended, if any are required on the
system, secure permissions must be applied.
Shell script
The following script can be run on the host to remediate the issue.
#!/bin/bash
for user in $(awk -F':' '{ if ($3 >= 1000 && $3 != 65534) print $1 }' /etc/passwd); do
home_dir=$(getent passwd "$user" | cut -d: -f6)
find "${home_dir}/.netrc" -exec chmod 0600 {} \;
done
Ansible playbook
The following playbook can be run with Ansible to remediate the issue.
- name: Get all local users from /etc/passwd
ansible.builtin.getent:
database: passwd
split: ':'
tags:
- CCE-89524-3
- accounts_users_netrc_file_permissions
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- restrict_strategy
- name: Create local_users variable from the getent output
ansible.builtin.set_fact:
local_users: '{{ ansible_facts.getent_passwd|dict2items }}'
tags:
- CCE-89524-3
- accounts_users_netrc_file_permissions
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- restrict_strategy
- name: Test for existence of .netrc file in home directories to avoid creating them,
but only fixing permissions
ansible.builtin.stat:
path: '{{ item.value[4] }}/.netrc'
register: path_exists
loop: '{{ local_users }}'
when:
- item.value[1]|int >= 1000
- item.value[1]|int != 65534
tags:
- CCE-89524-3
- accounts_users_netrc_file_permissions
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- restrict_strategy
- name: Ensure group and world cannot access respective .netrc files
ansible.builtin.file:
path: '{{ item.item.value[4] }}/.netrc'
mode: '0600'
state: file
loop: '{{ path_exists.results }}'
when: item.stat is defined and item.stat.exists
tags:
- CCE-89524-3
- accounts_users_netrc_file_permissions
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- restrict_strategy
