SV-217113r958398: The SUSE operating system must limit the number of concurrent sessions to 10 for all accounts and/or account types. | SUSE Linux Enterprise Server 12 STIG SCAP Benchmark

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Assessment Title

Rule Text

The SUSE operating system must limit the number of concurrent sessions to 10 for all accounts and/or account types.

Description

Discussion Text

SUSE operating system management includes the ability to control the number of users and user sessions that utilize a SUSE operating system. Limiting the number of allowed users and sessions per user is helpful in reducing the risks related to Denial-of-Service (DoS) attacks. This requirement addresses concurrent sessions for information system accounts and does not address concurrent sessions by single users via multiple system accounts. The maximum number of concurrent sessions should be defined based on mission needs and the operational environment for each system.

How this relates to the STIG checklist: STIG vs SCAP benchmark.

IA Controls

NIST SP 800-53

Not mappedCCI-000054V-77069SV-91765

References

DPMS Target SUSE Linux Enterprise Server 12 DISA DPMS Target SUSE Linux Enterprise Server 12 4033

Checks

DISA STIG (Manual Reference)

Verify the SUSE operating system limits the number of concurrent sessions to 10 for all accounts and/or account types by running the following command:

# grep "maxlogins" /etc/security/limits.conf /etc/security/limits.d/*.conf

The result must contain the following line:

* hard maxlogins 10

If the "maxlogins" item is missing, the line does not begin with a star symbol, or the value is not set to "10" or less, this is a finding.

SCC Automation Reference

The reconstructed evaluation script behind this rule's OVAL check(s) — every module a compound check combines, with this rule's own concrete values and DISA's SCC tool's real per-module mechanism curated from static teardown of SCC releases.

#!/bin/bash
# Reconstructed from oval:mil.disa.stig.sles12os:def:217113
# The SUSE operating system must limit the number of concurrent sessions to 10 for all accounts and/or account types.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# limits.conf and limits.d/*.conf:maxlogins is set to 10 or less by default
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  ( [ "$(sed -En 's/^\s*\*\s+(?:(?:hard)|(?:-))\s+maxlogins\s+(\d+)\s*$/\1/p' '/etc/security/limits.conf')" -le 10 ] ) || ( [ "$(grep -rhP --include='*.conf' '^\s*\*\s+(?:(?:hard)|(?:-))\s+maxlogins\s+(\d+)\s*$' '/etc/security/limits.d' | sed -En 's/^\s*\*\s+(?:(?:hard)|(?:-))\s+maxlogins\s+(\d+)\s*$/\1/p')" -le 10 ] )
}
# limits.conf and limits.d/*.conf:maxlogins is set to 10 or less for non-default domains
# textfilecontent54_object (textfilecontent54_test)
test_2() {
  ( [ "$(sed -En 's/^\s*[^#*\s]+\s+(?:(?:hard)|(?:-))\s+maxlogins\s+(\d+)\s*$/\1/p' '/etc/security/limits.conf')" -le 10 ] ) || ( [ "$(grep -rhP --include='*.conf' '^\s*[^#*\s]+\s+(?:(?:hard)|(?:-))\s+maxlogins\s+(\d+)\s*$' '/etc/security/limits.d' | sed -En 's/^\s*[^#*\s]+\s+(?:(?:hard)|(?:-))\s+maxlogins\s+(\d+)\s*$/\1/p')" -le 10 ] )
}

if ( test_1 && test_2 ); then
  echo "PASS"
else
  echo "FAIL"
fi

Assessment Script Powered by AISandbox-executed

A standalone Shell script to assess this control automatically. Review before running it in your environment.

Syntax-checked and actually executed in an isolated sandbox (not the real system this checks) — confirmed to run without errors.

#!/bin/sh
# OVAL definition: oval:mil.disa.stig.sles12os:def:217113

if [ ! -f "/etc/security/limits.conf" ] || [ ! $(grep -E '^\\s*\\*\\s+(?:(?:hard)|(?:-))\\s+maxlogins\\s+10\\s*$' /etc/security/limits.conf | wc -l) -ge 1 ]; then
    if [ ! -d "/etc/security/limits.d" ] || [ ! $(find /etc/security/limits.d -name "*.conf" -type f -exec grep -E '^\\s*\\*\\s+(?:(?:hard)|(?:-))\\s+maxlogins\\s+10\\s*$' {} + | wc -l) -ge 1 ]; then
        echo "FAIL"
        exit 1
    fi
fi

echo "PASS"
exit 0

Remediation

Configure the SUSE operating system to limit the number of concurrent sessions to 10 or less for all accounts and/or account types.

Add the following line to "/etc/security/limits.conf" or /etc/security/limits.d/*.conf file:

* hard maxlogins 10