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Ensure the Default Umask is Set Correctly For Interactive Users

An XCCDF Rule

Description

Remove the UMASK environment variable from all interactive users initialization files.

Rationale

The umask controls the default access mode assigned to newly created files. A umask of 077 limits new files to mode 700 or less permissive. Although umask can be represented as a four-digit number, the first digit representing special access modes is typically ignored or required to be 0. This requirement applies to the globally configured system defaults and the local interactive user defaults for each account on the system.

ID
xccdf_org.ssgproject.content_rule_accounts_umask_interactive_users
Severity
Medium
References
Updated



Remediation - Ansible

- name: Ensure interactive local users are the owners of their respective initialization
    files
  ansible.builtin.shell:
    cmd: |-
      for dir in $(awk -F':' '{ if ($3 >= 1000 && $3 != 65534) print $6}' /etc/passwd); do
        for file in $(find $dir -maxdepth 1 -type f -name ".*"); do

Remediation - Shell Script


while IFS= read -r dir; do
    while IFS= read -r -d '' file; do
        if [ "$(basename $file)" != ".bash_history" ]; then
            sed -i 's/^\(\s*umask\s*\)/#\1/g' "$file"
        fi