Ensure PAM Enforces Password Requirements - Authentication Retry Prompts Permitted Per-Session

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Description

To configure the number of retry prompts that are permitted per-session: Edit the pam_pwquality.so statement in /etc/pam.d/common-password to show retry=3, or a lower value if site policy is more restrictive. The DoD requirement is a maximum of 3 prompts per session.

Rationale

Setting the password retry prompts that are permitted on a per-session basis to a low value requires some software, such as SSH, to re-connect. This can slow down and draw additional attention to some types of password-guessing attacks. Note that this is different from account lockout, which is provided by the pam_faillock module.

Remediation

Shell script

The following script can be run on the host to remediate the issue.

#!/bin/bash

# Remediation is applicable only in certain platforms
if dpkg-query --show --showformat='${db:Status-Status}\n' 'libpam-runtime' 2>/dev/null | grep -q '^installed'; then

var_password_pam_retry='3'


conf_name=cac_pwquality
if [ ! -f /usr/share/pam-configs/"$conf_name" ]; then
    cat << EOF > /usr/share/pam-configs/"$conf_name"
Name: Pwquality password strength checking
Default: yes
Priority: 1025
Conflicts: cracklib, pwquality
Password-Type: Primary
Password:
    requisite                   pam_pwquality.so
EOF
fi

DEBIAN_FRONTEND=noninteractive pam-auth-update
PWQUALITY_CONF="/etc/security/pwquality.conf"
    regex="^\s*retry\s*="
    line="retry = $var_password_pam_retry"
    if ! grep -q $regex $PWQUALITY_CONF; then
        echo $line >> $PWQUALITY_CONF
    else
        sed -i --follow-symlinks 's|^\s*\(retry\s*=\s*\)\(\S\+\)|\1'"$var_password_pam_retry"'|g' $PWQUALITY_CONF
    fi

else
    >&2 echo 'Remediation is not applicable, nothing was done'
fi