Guide to the Secure Configuration of Alibaba Cloud Linux 3

with profile CIS Benchmark for Alibaba Cloud Linux 3 for Level 2
This profile defines a baseline that aligns to the "Level 2" configuration from the Center for Internet Security® Alibaba Cloud Linux 3 Benchmark™, v1.0.0, released 08-16-2019. This profile includes Center for Internet Security® Alibaba Cloud Linux 3 Benchmark™ content.

The SCAP Security Guide Project
https://www.open-scap.org/security-policies/scap-security-guide

This guide presents a catalog of security-relevant configuration settings for Alibaba Cloud Linux 3. It is a rendering of content structured in the eXtensible Configuration Checklist Description Format (XCCDF) in order to support security automation. The SCAP content is is available in the scap-security-guide package which is developed at https://www.open-scap.org/security-policies/scap-security-guide.

Providing system administrators with such guidance informs them how to securely configure systems under their control in a variety of network roles. Policy makers and baseline creators can use this catalog of settings, with its associated references to higher-level security control catalogs, in order to assist them in security baseline creation. This guide is a catalog, not a checklist, and satisfaction of every item is not likely to be possible or sensible in many operational scenarios. However, the XCCDF format enables granular selection and adjustment of settings, and their association with OVAL and OCIL content provides an automated checking capability. Transformations of this document, and its associated automated checking content, are capable of providing baselines that meet a diverse set of policy objectives. Some example XCCDF Profiles, which are selections of items that form checklists and can be used as baselines, are available with this guide. They can be processed, in an automated fashion, with tools that support the Security Content Automation Protocol (SCAP). The DISA STIG, which provides required settings for US Department of Defense systems, is one example of a baseline created from this guidance.

Do not attempt to implement any of the settings in this guide without first testing them in a non-operational environment. The creators of this guidance assume no responsibility whatsoever for its use by other parties, and makes no guarantees, expressed or implied, about its quality, reliability, or any other characteristic.

Profile Information

Profile Title	CIS Benchmark for Alibaba Cloud Linux 3 for Level 2
Profile ID	xccdf_org.ssgproject.content_profile_cis

CPE Platforms

cpe:/o:alinux:alibaba_cloud_linux:3

Revision History

Current version: 0.1.65

draft (as of 2022-12-21)

System Settings
Services

Checklist

Group Guide to the Secure Configuration of Alibaba Cloud Linux 3 Group contains 100 groups and 237 rules

Group System Settings Group contains 57 groups and 173 rules

[ref] Contains rules that check correct system settings.

Group Installing and Maintaining Software Group contains 7 groups and 11 rules

[ref] The following sections contain information on security-relevant choices during the initial operating system installation process and the setup of software updates.

Group System and Software Integrity Group contains 3 groups and 3 rules

[ref] System and software integrity can be gained by installing antivirus, increasing system encryption strength with FIPS, verifying installed software, enabling SELinux, installing an Intrusion Prevention System, etc. However, installing or enabling integrity checking tools cannot prevent intrusions, but they can detect that an intrusion may have occurred. Requirements for integrity checking may be highly dependent on the environment in which the system will be used. Snapshot-based approaches such as AIDE may induce considerable overhead in the presence of frequent software updates.

Group Software Integrity Checking Group contains 1 group and 2 rules

[ref] Both the AIDE (Advanced Intrusion Detection Environment) software and the RPM package management system provide mechanisms for verifying the integrity of installed software. AIDE uses snapshots of file metadata (such as hashes) and compares these to current system files in order to detect changes.

The RPM package management system can conduct integrity checks by comparing information in its metadata database with files installed on the system.

Group Verify Integrity with AIDE Group contains 2 rules

[ref] AIDE conducts integrity checks by comparing information about files with previously-gathered information. Ideally, the AIDE database is created immediately after initial system configuration, and then again after any software update. AIDE is highly configurable, with further configuration information located in /usr/share/doc/aide-VERSION.

Rule Install AIDE [ref]

The aide package can be installed with the following command:

$ sudo yum install aide

Rationale:

The AIDE package must be installed if it is to be available for integrity checking.

Severity:

medium

Rule ID: xccdf_org.ssgproject.content_rule_package_aide_installed

Identifiers and References

References: BP28(R51), 1, 11, 12, 13, 14, 15, 16, 2, 3, 5, 7, 8, 9, 5.10.1.3, APO01.06, BAI01.06, BAI02.01, BAI03.05, BAI06.01, BAI10.01, BAI10.02, BAI10.03, BAI10.05, DSS01.03, DSS03.05, DSS04.07, DSS05.02, DSS05.03, DSS05.05, DSS05.07, DSS06.02, DSS06.06, CCI-002696, CCI-002699, CCI-001744, 4.3.4.3.2, 4.3.4.3.3, 4.3.4.4.4, SR 3.1, SR 3.3, SR 3.4, SR 3.8, SR 4.1, SR 6.2, SR 7.6, 1034, 1288, 1341, 1417, A.11.2.4, A.12.1.2, A.12.2.1, A.12.4.1, A.12.5.1, A.12.6.2, A.14.1.2, A.14.1.3, A.14.2.2, A.14.2.3, A.14.2.4, A.14.2.7, A.15.2.1, A.8.2.3, CM-6(a), DE.CM-1, DE.CM-7, PR.DS-1, PR.DS-6, PR.DS-8, PR.IP-1, PR.IP-3, Req-11.5, SRG-OS-000363-GPOS-00150, SRG-OS-000445-GPOS-00199, 1.4.1

Remediation OSBuild Blueprint snippet ⇲


[[packages]]
name = "aide"
version = "*"

Remediation Puppet snippet ⇲

Complexity:	low
Disruption:	low
Strategy:	enable

include install_aide

class install_aide {
  package { 'aide':
    ensure => 'installed',
  }
}

Remediation Ansible snippet ⇲

Complexity:	low
Disruption:	low
Strategy:	enable

- name: Ensure aide is installed
  package:
    name: aide
    state: present
  when: ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
  tags:
  - CJIS-5.10.1.3
  - NIST-800-53-CM-6(a)
  - PCI-DSS-Req-11.5
  - enable_strategy
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - package_aide_installed

Rule Configure Periodic Execution of AIDE [ref]

At a minimum, AIDE should be configured to run a weekly scan. To implement a daily execution of AIDE at 4:05am using cron, add the following line to /etc/crontab:

05 4 * * * root /usr/sbin/aide --check

To implement a weekly execution of AIDE at 4:05am using cron, add the following line to /etc/crontab:

05 4 * * 0 root /usr/sbin/aide --check

AIDE can be executed periodically through other means; this is merely one example. The usage of cron's special time codes, such as @daily and @weekly is acceptable.

Rationale:

By default, AIDE does not install itself for periodic execution. Periodically running AIDE is necessary to reveal unexpected changes in installed files.

Unauthorized changes to the baseline configuration could make the system vulnerable to various attacks or allow unauthorized access to the operating system. Changes to operating system configurations can have unintended side effects, some of which may be relevant to security.

Detecting such changes and providing an automated response can help avoid unintended, negative consequences that could ultimately affect the security state of the operating system. The operating system's Information Management Officer (IMO)/Information System Security Officer (ISSO) and System Administrators (SAs) must be notified via email and/or monitoring system trap when there is an unauthorized modification of a configuration item.

Severity:

medium

Rule ID: xccdf_org.ssgproject.content_rule_aide_periodic_cron_checking

Identifiers and References

References: BP28(R51), 1, 11, 12, 13, 14, 15, 16, 2, 3, 5, 7, 8, 9, 5.10.1.3, APO01.06, BAI01.06, BAI02.01, BAI03.05, BAI06.01, BAI10.01, BAI10.02, BAI10.03, BAI10.05, DSS01.03, DSS03.05, DSS04.07, DSS05.02, DSS05.03, DSS05.05, DSS05.07, DSS06.02, DSS06.06, CCI-001744, CCI-002699, CCI-002702, 4.3.4.3.2, 4.3.4.3.3, 4.3.4.4.4, SR 3.1, SR 3.3, SR 3.4, SR 3.8, SR 4.1, SR 6.2, SR 7.6, A.11.2.4, A.12.1.2, A.12.2.1, A.12.4.1, A.12.5.1, A.12.6.2, A.14.1.2, A.14.1.3, A.14.2.2, A.14.2.3, A.14.2.4, A.14.2.7, A.15.2.1, A.8.2.3, SI-7, SI-7(1), CM-6(a), DE.CM-1, DE.CM-7, PR.DS-1, PR.DS-6, PR.DS-8, PR.IP-1, PR.IP-3, Req-11.5, SRG-OS-000363-GPOS-00150, SRG-OS-000446-GPOS-00200, SRG-OS-000447-GPOS-00201, 1.4.2

Remediation Ansible snippet ⇲

Complexity:	low
Disruption:	low
Strategy:	restrict

- name: Ensure AIDE is installed
  package:
    name: '{{ item }}'
    state: present
  with_items:
  - aide
  when: ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
  tags:
  - CJIS-5.10.1.3
  - NIST-800-53-CM-6(a)
  - NIST-800-53-SI-7
  - NIST-800-53-SI-7(1)
  - PCI-DSS-Req-11.5
  - aide_periodic_cron_checking
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy

- name: Set cron package name - RedHat
  set_fact:
    cron_pkg_name: cronie
  when:
  - ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
  - ansible_os_family == "RedHat" or ansible_os_family == "Suse"
  tags:
  - CJIS-5.10.1.3
  - NIST-800-53-CM-6(a)
  - NIST-800-53-SI-7
  - NIST-800-53-SI-7(1)
  - PCI-DSS-Req-11.5
  - aide_periodic_cron_checking
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy

- name: Set cron package name - Debian
  set_fact:
    cron_pkg_name: cron
  when:
  - ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
  - ansible_os_family == "Debian"
  tags:
  - CJIS-5.10.1.3
  - NIST-800-53-CM-6(a)
  - NIST-800-53-SI-7
  - NIST-800-53-SI-7(1)
  - PCI-DSS-Req-11.5
  - aide_periodic_cron_checking
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy

- name: Install cron
  package:
    name: '{{ cron_pkg_name }}'
    state: present
  when: ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
  tags:
  - CJIS-5.10.1.3
  - NIST-800-53-CM-6(a)
  - NIST-800-53-SI-7
  - NIST-800-53-SI-7(1)
  - PCI-DSS-Req-11.5
  - aide_periodic_cron_checking
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy

- name: Configure Periodic Execution of AIDE
  cron:
    name: run AIDE check
    minute: 5
    hour: 4
    weekday: 0
    user: root
    job: /usr/sbin/aide --check
  when: ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
  tags:
  - CJIS-5.10.1.3
  - NIST-800-53-CM-6(a)
  - NIST-800-53-SI-7
  - NIST-800-53-SI-7(1)
  - PCI-DSS-Req-11.5
  - aide_periodic_cron_checking
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy

Group System Cryptographic Policies Group contains 1 rule

[ref] Linux has the capability to centrally configure cryptographic polices. The command update-crypto-policies is used to set the policy applicable for the various cryptographic back-ends, such as SSL/TLS libraries. The configured cryptographic policies will be the default policy used by these backends unless the application user configures them otherwise. When the system has been configured to use the centralized cryptographic policies, the administrator is assured that any application that utilizes the supported backends will follow a policy that adheres to the configured profile. Currently the supported backends are:

GnuTLS library
OpenSSL library
NSS library
OpenJDK
Libkrb5
BIND
OpenSSH

Applications and languages which rely on any of these backends will follow the system policies as well. Examples are apache httpd, nginx, php, and others.

Rule Configure System Cryptography Policy [ref]

To configure the system cryptography policy to use ciphers only from the FUTURE policy, run the following command:

$ sudo update-crypto-policies --set FUTURE

The rule checks if settings for selected crypto policy are configured as expected. Configuration files in the /etc/crypto-policies/back-ends are either symlinks to correct files provided by Crypto-policies package or they are regular files in case crypto policy customizations are applied. Crypto policies may be customized by crypto policy modules, in which case it is delimited from the base policy using a colon.

Warning: The system needs to be rebooted for these changes to take effect.

Warning: System Crypto Modules must be provided by a vendor that undergoes FIPS-140 certifications. FIPS-140 is applicable to all Federal agencies that use cryptographic-based security systems to protect sensitive information in computer and telecommunication systems (including voice systems) as defined in Section 5131 of the Information Technology Management Reform Act of 1996, Public Law 104-106. This standard shall be used in designing and implementing cryptographic modules that Federal departments and agencies operate or are operated for them under contract. See https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.140-2.pdf To meet this, the system has to have cryptographic software provided by a vendor that has undergone this certification. This means providing documentation, test results, design information, and independent third party review by an accredited lab. While open source software is capable of meeting this, it does not meet FIPS-140 unless the vendor submits to this process.

Rationale:

Centralized cryptographic policies simplify applying secure ciphers across an operating system and the applications that run on that operating system. Use of weak or untested encryption algorithms undermines the purposes of utilizing encryption to protect data.

Severity:

high

Rule ID: xccdf_org.ssgproject.content_rule_configure_crypto_policy

Identifiers and References

References: 164.308(a)(4)(i), 164.308(b)(1), 164.308(b)(3), 164.312(e)(1), 164.312(e)(2)(ii), 1446, CIP-003-8 R4.2, CIP-007-3 R5.1, CIP-007-3 R7.1, AC-17(a), AC-17(2), CM-6(a), MA-4(6), SC-13, SC-12(2), SC-12(3), FCS_COP.1(1), FCS_COP.1(2), FCS_COP.1(3), FCS_COP.1(4), FCS_CKM.1, FCS_CKM.2, FCS_TLSC_EXT.1, SRG-OS-000396-GPOS-00176, SRG-OS-000393-GPOS-00173, SRG-OS-000394-GPOS-00174, 1.10

Remediation Ansible snippet ⇲

Complexity:	low
Disruption:	low
Strategy:	restrict

- name: XCCDF Value var_system_crypto_policy # promote to variable
  set_fact:
    var_system_crypto_policy: !!str FUTURE
  tags:
    - always

- name: Configure System Cryptography Policy
  lineinfile:
    path: /etc/crypto-policies/config
    regexp: ^(?!#)(\S+)$
    line: '{{ var_system_crypto_policy }}'
    create: true
  tags:
  - NIST-800-53-AC-17(2)
  - NIST-800-53-AC-17(a)
  - NIST-800-53-CM-6(a)
  - NIST-800-53-MA-4(6)
  - NIST-800-53-SC-12(2)
  - NIST-800-53-SC-12(3)
  - NIST-800-53-SC-13
  - configure_crypto_policy
  - high_severity
  - low_complexity
  - low_disruption
  - no_reboot_needed
  - restrict_strategy

- name: Verify that Crypto Policy is Set (runtime)
  command: /usr/bin/update-crypto-policies --set {{ var_system_crypto_policy }}
  tags:
  - NIST-800-53-AC-17(2)
  - NIST-800-53-AC-17(a)
  - NIST-800-53-CM-6(a)
  - NIST-800-53-MA-4(6)
  - NIST-800-53-SC-12(2)
  - NIST-800-53-SC-12(3)
  - NIST-800-53-SC-13
  - configure_crypto_policy
  - high_severity
  - low_complexity
  - low_disruption
  - no_reboot_needed
  - restrict_strategy

Remediation Shell script ⇲


var_system_crypto_policy='FUTURE'


stderr_of_call=$(update-crypto-policies --set ${var_system_crypto_policy} 2>&1 > /dev/null)
rc=$?

if test "$rc" = 127; then
	echo "$stderr_of_call" >&2
	echo "Make sure that the script is installed on the remediated system." >&2
	echo "See output of the 'dnf provides update-crypto-policies' command" >&2
	echo "to see what package to (re)install" >&2

	false  # end with an error code
elif test "$rc" != 0; then
	echo "Error invoking the update-crypto-policies script: $stderr_of_call" >&2
	false  # end with an error code
fi

Group Disk Partitioning Group contains 6 rules

[ref] To ensure separation and protection of data, there are top-level system directories which should be placed on their own physical partition or logical volume. The installer's default partitioning scheme creates separate logical volumes for /, /boot, and swap.

If starting with any of the default layouts, check the box to \"Review and modify partitioning.\" This allows for the easy creation of additional logical volumes inside the volume group already created, though it may require making /'s logical volume smaller to create space. In general, using logical volumes is preferable to using partitions because they can be more easily adjusted later.
If creating a custom layout, create the partitions mentioned in the previous paragraph (which the installer will require anyway), as well as separate ones described in the following sections.

If a system has already been installed, and the default partitioning scheme was used, it is possible but nontrivial to modify it to create separate logical volumes for the directories listed above. The Logical Volume Manager (LVM) makes this possible. See the LVM HOWTO at http://tldp.org/HOWTO/LVM-HOWTO/ for more detailed information on LVM.

Rule Ensure /home Located On Separate Partition [ref]
If user home directories will be stored locally, create a separate partition for `/home` at installation time (or migrate it later using LVM). If `/home` will be mounted from another system such as an NFS server, then creating a separate partition is not necessary at installation time, and the mountpoint can instead be configured later.
Rationale:	Ensuring that `/home` is mounted on its own partition enables the setting of more restrictive mount options, and also helps ensure that users cannot trivially fill partitions used for log or audit data storage.
Severity:	low
Rule ID:	xccdf_org.ssgproject.content_rule_partition_for_home
Identifiers and References	References: BP28(R12), 12, 15, 8, APO13.01, DSS05.02, CCI-000366, CCI-001208, SR 3.1, SR 3.5, SR 3.8, SR 4.1, SR 4.3, SR 5.1, SR 5.2, SR 5.3, SR 7.1, SR 7.6, A.13.1.1, A.13.2.1, A.14.1.3, CM-6(a), SC-5(2), PR.PT-4, SRG-OS-000480-GPOS-00227, 1.1.7.1

Rule Ensure /tmp Located On Separate Partition [ref]
The `/tmp` directory is a world-writable directory used for temporary file storage. Ensure it has its own partition or logical volume at installation time, or migrate it using LVM.
Rationale:	The `/tmp` partition is used as temporary storage by many programs. Placing `/tmp` in its own partition enables the setting of more restrictive mount options, which can help protect programs which use it.
Severity:	low
Rule ID:	xccdf_org.ssgproject.content_rule_partition_for_tmp
Identifiers and References	References: BP28(R12), 12, 15, 8, APO13.01, DSS05.02, CCI-000366, SR 3.1, SR 3.5, SR 3.8, SR 4.1, SR 4.3, SR 5.1, SR 5.2, SR 5.3, SR 7.1, SR 7.6, A.13.1.1, A.13.2.1, A.14.1.3, CM-6(a), SC-5(2), PR.PT-4, SRG-OS-000480-GPOS-00227, 1.1.2.1

Rule Ensure /var Located On Separate Partition [ref]
The `/var` directory is used by daemons and other system services to store frequently-changing data. Ensure that `/var` has its own partition or logical volume at installation time, or migrate it using LVM.
Rationale:	Ensuring that `/var` is mounted on its own partition enables the setting of more restrictive mount options. This helps protect system services such as daemons or other programs which use it. It is not uncommon for the `/var` directory to contain world-writable directories installed by other software packages.
Severity:	low
Rule ID:	xccdf_org.ssgproject.content_rule_partition_for_var
Identifiers and References	References: BP28(R12), 12, 15, 8, APO13.01, DSS05.02, CCI-000366, SR 3.1, SR 3.5, SR 3.8, SR 4.1, SR 4.3, SR 5.1, SR 5.2, SR 5.3, SR 7.1, SR 7.6, A.13.1.1, A.13.2.1, A.14.1.3, CM-6(a), SC-5(2), PR.PT-4, SRG-OS-000480-GPOS-00227, SRG-OS-000341-VMM-001220, 1.1.3.1

Rule Ensure /var/log Located On Separate Partition [ref]
System logs are stored in the `/var/log` directory. Ensure that `/var/log` has its own partition or logical volume at installation time, or migrate it using LVM.
Rationale:	Placing `/var/log` in its own partition enables better separation between log files and other files in `/var/`.
Severity:	low
Rule ID:	xccdf_org.ssgproject.content_rule_partition_for_var_log
Identifiers and References	References: BP28(R12), BP28(R47), 1, 12, 14, 15, 16, 3, 5, 6, 8, APO11.04, APO13.01, BAI03.05, DSS05.02, DSS05.04, DSS05.07, MEA02.01, CCI-000366, 4.3.3.3.9, 4.3.3.5.8, 4.3.4.4.7, 4.4.2.1, 4.4.2.2, 4.4.2.4, SR 2.10, SR 2.11, SR 2.12, SR 2.8, SR 2.9, SR 3.1, SR 3.5, SR 3.8, SR 4.1, SR 4.3, SR 5.1, SR 5.2, SR 5.3, SR 7.1, SR 7.6, A.12.4.1, A.12.4.2, A.12.4.3, A.12.4.4, A.12.7.1, A.13.1.1, A.13.2.1, A.14.1.3, CIP-007-3 R6.5, CM-6(a), AU-4, SC-5(2), PR.PT-1, PR.PT-4, SRG-OS-000480-GPOS-00227, 1.1.11

Rule Ensure /var/log/audit Located On Separate Partition [ref]
Audit logs are stored in the `/var/log/audit` directory. Ensure that `/var/log/audit` has its own partition or logical volume at installation time, or migrate it using LVM. Make absolutely certain that it is large enough to store all audit logs that will be created by the auditing daemon.
Rationale:	Placing `/var/log/audit` in its own partition enables better separation between audit files and other files, and helps ensure that auditing cannot be halted due to the partition running out of space.
Severity:	low
Rule ID:	xccdf_org.ssgproject.content_rule_partition_for_var_log_audit
Identifiers and References	References: BP28(R43), 1, 12, 13, 14, 15, 16, 2, 3, 5, 6, 8, APO11.04, APO13.01, BAI03.05, BAI04.04, DSS05.02, DSS05.04, DSS05.07, MEA02.01, CCI-000366, CCI-001849, 164.312(a)(2)(ii), 4.3.3.3.9, 4.3.3.5.8, 4.3.4.4.7, 4.4.2.1, 4.4.2.2, 4.4.2.4, SR 2.10, SR 2.11, SR 2.12, SR 2.8, SR 2.9, SR 3.1, SR 3.5, SR 3.8, SR 4.1, SR 4.3, SR 5.1, SR 5.2, SR 5.3, SR 7.1, SR 7.2, SR 7.6, A.12.1.3, A.12.4.1, A.12.4.2, A.12.4.3, A.12.4.4, A.12.7.1, A.13.1.1, A.13.2.1, A.14.1.3, A.17.2.1, CIP-007-3 R6.5, CM-6(a), AU-4, SC-5(2), PR.DS-4, PR.PT-1, PR.PT-4, FMT_SMF_EXT.1, SRG-OS-000341-GPOS-00132, SRG-OS-000480-GPOS-00227, SRG-OS-000341-VMM-001220, 1.1.12

Rule Ensure /var/tmp Located On Separate Partition [ref]
The `/var/tmp` directory is a world-writable directory used for temporary file storage. Ensure *e="collapse" data-target="#idm37935" tabindex="0" role="button" aria-expanded="false" title="Activate to reveal" href="#!">Remediation Shell script ⇲ SR 1.3, A.9.4.4, A. v((a.parentNode\|\|{}).fircondensed">
Complexity:	low
Disruption:	low
Strategy:	disable


# CAUTION: This remek which originated outside
of your network.



A typical network setup involves a small number of interl-sm-9{width:75%}.col-sm-8{width:66.66666667%}.col-sm-7{width:58.33333333%}.col-sm-6{width:50%}.col-sm-5{width:41.66666667%}.col-sm-4{width:33.33333333%}.col-sm-3{widthse}blockquote{padding:10px 20px;margin:0 0 20px;font-size:17.5px;border-left:5px solid #eee}blockquote p:last-child,blockquote ul:last-child,blockquote ol:last-child{margin-bottom:0}blockquote footer,blockquote small,blockquote .small{display:block;font-size:80%;line-height:1.42857143;color:#777}blockquote footer:before,blockquote small:before,blockquote .small:before{content:'\2014 \00A0'}.blockquote-reverse,blockquote.pull-right{padding-right:15px;padding-left:0;border-right:5px solid #eee;border-left:0;text-align:right}.blockquote-reverse footer:before,blockquote.pull-right footer:before,.blockquote-reverse small:before,blockquote.pull-right small:before,.blockquote-reverse .small:before,blockquote.pull-right .small:before{content:''}.blockquote-reverse footer:after,blockquote.pull-right footer:after,.blockquote-reverse small:after,blockquote.pull-right small:after,.blockquote-reverse .small:after,blockquote.pull-right .small:after{content:'\00A0 \2014'}address{margin-bottom:20px;font-style:normal;line-height:1.42857143}code,kbd,pre,samp{font-family:Menlo,Monaco,Consolas,"Courier New",monospace}code{padding:2px 4px;font-size:90%;color:#c7254e;background-color:#f9f2f4;border-radius:4px}kbd{padding:2px 4px;font-size:90%rvice_ntpdate_disabled">Rule  
                                Disable ntpdate Service (ntpdate)
                                  [ref]

The ntpdate service sets the local hardware clock by polling NTP servers when the system boots. It synchronizes to the NTP servers listed in /etc/ntp/step-tickers or /etc/ntp.conf and then sets the local hardware clock to the newly synchronized system time. The ntpdate service can be disabled with the following command:

$ sudo systemctl mask --now ntpdate.service

Rationale:

The ntpdate service may only be suitable for systems which are rebooted frequently enough that clock drift does not cause problems between reboots. In any event, the functionality of the ntpdate service is now available in the ntpd program and should be considere03-03-2013-security-for-indu">SR 5.2, A.10.1.1, A.11.SR/ssh/sshd_config create: true regexp: (?i)^\s*PermitRootLogin\s+ line: PermitRootscape(),this.resize(),b(document).off("focusin.bs.modal"),this.$element.remoe: /usr/sbin/sshd -t -f %s when: ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"] tags: - CJIS-5.5.6 - NIST-800-171-3.1.1 - NIST-800-171-3.1.5 - NIST-800-53-AC-17(a) - NIST-800-53-AC-6(2) - NIST-800-53-CM-6(a) - NIST-800-53-CM-7(a) - NIST-800-53-CM-7(b) - NIST-800-53-IA-2 - NIST-800-53-IA-2(5) - PCI-DSS-Req-2.2.6 - low_complexity - low_disruption - medium_severity - no_reboot_needed - restrict_strategy - sshd_disable_root_login

Remediation Shell script ⇲

Complexity:	low
Disruption:	low
Strategy:	restrict

# Remediation is applicable only in certain platforms
if [ ! -f /.dockerenv ] && [ ! -f /run/.containerenv ]; then

if [ -e "/etc/ssh/sshd_config" ] ; then
    
    LC_ALL=C sed -i "/^\s*PermitRootLogin\s\+/Id" "/etc/ssh/sshd_config"
else
    touch "/etc/ssh/sshd_config"
fi
# make sure file has newline at the end
sed -i -e '$a\' "/etc/ssh/sshd_config"

cp "/etc/ssh/sshd_config" "/etc/ssh/sshd_config.bak"
# Insert before the line matching the regex '^Match'.
line_number="$(LC_ALL=C grep -n "^Match" "/etc/ssh/sshd_config.bak" | LC_ALL=C sed 's/:.*//g')"
if [ -z "$line_number" ]; then
    # There was no match of '^Match', insert at
    # the end of the file.
    printf '%s\n' "PermitRootLogin no" >> "/etc/ssh/sshd_config"
else
    head -n "$(( line_number - 1 ))" "/etc/ssh/sshd_config.bak" > "/etc/ssh/sshd_config"
    printf '%s\n' "PermitRootLogin no" >> "/etc/ssh/sshd_config"
    tail -n "+$(( line_number ))" "/etc/ssh/sshd_config.bak" >> "/etc/ssh/sshd_config"
fi
# Clean up after ourselves.
rm "/etc/ssh/sshd_config.bak"

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

r;r++)if(g=a[r],g||0===g)if("object"===n.type(g))n.merge(q,g.nodeType?[g]:g);else if(ga.test(g)){i=i||p.appendChild(b.createElement("div")),j=($.exec(g)||["",""])[1].toLowerCase(),m=da[j]||da._default,i.innerHTML=m[1]+n.htmlPrefilter(g)+m[2],f=m[0];while(f--)i=i.lastChild;if(!l.leadingWhitespace&&aa.test(g)&&q.push(b.createTextNode(aa.exec(g)[0])),!l.tbody){g="table"!==j||ha.test(g)?"

Rule Do Not Allow SSH Environment Options [ref]

Ensure that users are not able to override environment variables of the SSH daemon.
The default SSH configuration disables environment processing. The appropriate configuration is used if no value is set for PermitUserEnvironment.
To explicitly disable Environment options, add or correct the following /etc/ssh/sshd_config:

PermitUserEnvironment no

Rationale:

SSH environment options potentially allow users to bypass access restriction in some configurations.

Severity:

medium

Rule ID: xccdf_org.ssgproject.content_rule_sshd_do_not_permit_user_env

Identifiers and References

References: 11, 3, 9, 5.5.6, BAI10.01, BAI10.02, BAI10.03, BAI10.05, 3.1.12, CCI-000366, 164.308(a)(4)(i), 164.308(b)(1), 164.308(b)(3), 164.310(b), 164.312(e)(1), 164.312(e)(2)(ii), 4.3.4.3.2, 4.3.4.3.3, SR 7.6, A.12.1.2, A.12.5.1, A.12.6.2, A.14.2.2, A.14.2.3, A.14.2.4, AC-17(a), CM-7(a), CM-7(b), CM-6(a), PR.IP-1, Req-2.2.6, SRG-OS-000480-GPOS-00229, SRG-OS-000480-VMM-002000, 5.2.12

Remediation Ansible snippet ⇲

Complexity:	low
Disruption:	low
Strategy:	restrict

- name: Do Not Allow SSH Environment Options
  block:

  - name: Check for duplicate values
    lineinfile:
      path: /etc/ssh/sshd_config
      create: false
      regexp: (?i)^\s*PermitUserEnvironment\s+
      state: absent
    check_mode: true
    changed_when: false
    register: dupes

  - name: Deduplicate values from /etc/ssh/sshd_config
    lineinfile:
      path: /etc/ssh/sshd_config
      create: false
      regexp: (?i)^\s*PermitUserEnvironment\s+
      state: absent
    when: dupes.found is defined and dupes.found > 1

  - name: Insert correct line to /etc/ssh/sshd_config
    lineinfile:
      path: /etc/ssh/sshd_config
      create: true
      regexp: (?i)^\s*PermitUserEnvironment\s+
      line: PermitUserEnvironment no
      state: present
      insertbefore: ^[#\s]*Match
      validate: /usr/sbin/sshd -t -f %s
  when: ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
  tags:
  - CJIS-5.5.6
  - NIST-800-171-3.1.12
  - NIST-800-53-AC-17(a)
  - NIST-800-53-CM-6(a)
  - NIST-800-53-CM-7(a)
  - NIST-800-53-CM-7(b)
  - PCI-DSS-Req-2.2.6
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy
  - sshd_do_not_permit_user_env

Remediation Shell script ⇲

Complexity:	low
Disruption:	low
Strategy:	restrict

# Remediation is apM-7(b)
  - NIST-800-53-SC-7(a)
  - disable_strategy
  - low_complexity
  - medium_disruption
  - medium_severity
  - reboot_required
  - sysctl_net_ipv4_conf_all_accept_redirects
 unsuccessful file modification;
it was written with DISA STIG in mind. Other policies should use a
separate ru0480-GPOS-00227, SRG-OS-000107-VMM-000530, Rationale:

Unsuccessful attempts to access files could be an indicator of malicious activity on a system. Auditing these events could serve as evidence of potential system compromise.

Severity:

medium

Rule ID: xccdf_org.ssgproject.content_rule_audit_rules_unsuccessful_file_modification

Identifiers and References

References: 1, 11

Rule Enable SSH Warning Banner [ref]
To enable the warning banner and ensure it is consistent across the system, add or correct the following line in `/etc/ssh/sshd_config`: Banner /etc/issue Another section contains information on how to create an appropriate system-wide warning banner.
Rationale:	The warning message reinforces policy awareness during the logon process and facilitates possible legal action against attackers. Alternatively, systems whose ownership should not be obvious should ensure usage of a banner that does not provide easy attribution.
Severity:	medium
Rule ID:	xccdf_org.ssgproject.content_rule_sshd_enable_warning_banner
Identifiers and References	References: 1, 12, 15, 16, 5.5.6, DSS05.04, DSS05.10, DSS06.10, 3.1.9, CCI-000048, CCI-000050, CCI-001384, CCI-001385, CCI-001386, CCI-001387, CCI-001388, 164.308(a)(4)(i), 164.308(b)(1), 164.308(b)(3), 164.310(b), 164.312(e)(1), 164.312(e)(2)(ii), 4.3.3.6.1, 4.3.3.6.2, 4.3.3.6.3, 4.3.3.6.4, 4.3.3.6.5, 4.3.3.6.6, 4.3.3.6.7, 4.3.3.6.8, 4.3.3.6.9, SR 1.1, SR 1.10, SR 1.2, SR 1.5, SR 1.7, SR 1.8, SR 1.9, A.18.1.4, A.9.2.1, SR 5.2, SR 5.3, SR 6.1, SR 6.2, SR 7.1, SR 7.6, 0582, 0584, 05885, 0586, 0846, 0957, A.11.2.6, A.12.4.1, A.12.4.2, A.12.4.3, A.12.4.4, A.12.7.1, A.13.1.1, A.13.2.1, A.14.1.3, A.14.2.7, A.15.2.1, A.15.2.2, A.16.1.5, A.16.1.7, A.6.2.1, A.6.2.2, AU-2(d), AU-12(c), CM-6(a), DE.AE-3, DE.AE-5, DE.CM-1, DE.CM-3, DE.CM-7, ID.SC-4, PR.AC-3, PR.PT-1, PR.PT-4, RS.AN-1, RS.AN-4, Req-10.2.4, Req-10.2.1

Group Record Information on Kernel Modules Loading and Unloading Group contains 1 rule

[ref] To capture kernel module loading and unloading events, use following lines, setting ARCH to either b32 for 32-bit system, or having two lines for both b32 and b64 in case your system is 64-bit:

-a always,exit -F arch=ARCH -S init_module,delete_module -F key=modules

Place to add the lines depends on a way auditd daemon is configured. If it is configured to use the augenrules program (the default), add the lines to a file with suffix .rules in the directory /etc/audit/rules.d. If the auditd daemon is configured to use the auditctl utility, add the lines to file /etc/audit/audit.rules.

SR '/bin/sh -c "/sbin/sulogin; /usr/bin/systemctl --fail --no-block default"' if grep "^ExecStart=.*" "$service_file" ;lect submit keydown keypress keyup error contextmenu".split(" "),func="https://www.isa.org/products/ansi-isa-62443-3-3-99-03-03-2013-security-for-indu">SR 5.2, A.13.1.3, A.13.2.1, A.13.2.3, A.13.2.4, A.14.1.2, A.14.1.3, A.6.1.2, A.7.1.1, A.7.1.2, A.7.3.1, [ref]SR '/bin/sh -c "/sbin/sulogin; /usr/bin/systemctl --fail --no-block default"' if grep "^ExecStart=.*" "$service_file" ;lect submit keydown keypress keyup error contextmenu".split(" "),func="https://www.isa.org/products/ansi-isa-62443-3-3-99-03-03-2013-security-for-indu">SR 5.2, A.13.1.3, A.13.2.1, A.13.2.3, A.13.2.4, A.14.1.2, A.14.1.3, A.6.1.2, A.7.1.1, A.7.1.2, A.7.3.1, [ref]SR '/bin/sh -c "/sbin/sulogin; /usr/bin/systemctl --fail --no-block default"' if grep "^ExecStart=.*" "$service_file" ;lect submit keydown keypress keyup error contextmenu".split(" "),func="https://www.isa.org/products/ansi-isa-62443-3-3-99-03-03-2013-security-for-indu">SR 5.2, A.13.1.3, A.13.2.1, A.13.2.3, A.13.2.4, A.14.1.2, A.14.1.3, A.6.1.2, A.7.1.1, A.7.1.2, A.7.3.1, [ref]SR '/bin/sh -c "/sbin/sulogin; /usr/bin/systemctl --fail --no-block default"' if grep "^ExecStart=.*" "$service_file" ;lect submit keydown keypress keyup error contextmenu".split(" "),func="https://www.isa.org/products/ansi-isa-62443-3-3-99-03-03-2013-security-for-indu">SR 5.2, A.13.1.3, A.13.2.1, A.13.2.3, A.13.2.4, A.14.1.2, A.14.1.3, A.6.1.2, A.7.1.1, A.7.1.2, A.7.3.1, [ref]SR '/bin/sh -c "/sbin/sulogin; /usr/bin/systemctl --fail --no-block default"' if grep "^ExecStart=.*" "$service_file" ;lect submit keydown keypress keyup error contextmenu".split(" "),func="https://www.isa.org/products/ansi-isa-62443-3-3-99-03-03-2013-security-for-indu">SR 5.2, A.13.1.3, A.13.2.1, A.13.2.3, A.13.2.4, A.14.1.2, A.14.1.3, A.6.1.2, A.7.1.1, A.7.1.2, A.7.3.1, [ref]SR '/bin/sh -c "/sbin/sulogin; 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Rule Ensure auditd Collects Information on Kernel Module Loading and Unloading [ref]
To capture kernel module loading and unloading events, use following lines, setting ARCH to either b32 for 32-bit system, or having two lines for both b32 and b64 in case your system is 64-bit: -a always,exit -F arch=ARCH -S init_module,finit_module,delete_module -F key=modules The place to add the lines depends on a way `auditd` daemon is configured. If it is configured to use the `augenrules` program (the default), add the lines to a file with suffix `.rules` in the directory `/etc/audit/rules.d`. If the `auditd` daemon is configured to use the `auditctl` utility, add the lines to file `/etc/audit/audit.rules`.
Rationale:	The addition/removal of kernel modules can be used to alter the behavior of the kernel and potentially introduce malicious code into kernel space. It is important to have an audit trail of modules that have been introduced into the kernel.
Severity:	medium
Rule ID:	xccdf_org.ssgproject.content_rule_audit_rules_kernel_module_loading
Identifiers and References	References: 1, 11, 12, 13, 14, 15, 16, 19, 2, 3, 4, 5, 6, 7, 8, 9, 5.4.1.1, APO10.01, APO10.03, APO10.04, APO10.05, APO11.04, APO12.06, APO13.01, BAI03.05, BAI08.02, DSS01.03, DSS01.04, DSS02.02, DSS02.04, DSS02.07, DSS03.01, DSS03.05, DSS05.02, DSS05.03, DSS05.04, DSS05.05, DSS05.07, MEA01.01, MEA01.02, MEA01.03, MEA01.04, MEA01.05, MEA02.://ww>, 3.1.7, CCI-000172, 4.2.3.10, 4.3.2.6.7, 4.3.3.3.9, 4.3.3.5.8, 4.3.3.6.6, 4.3.4.4.7, AC-17(a), CIP-004-6 R2.3, CIP-007-3 R2.1, CIP-007-3 R2.2, APO01.06, DSS0s/isa-62443-2-1-2009-security-for-industrial-automat">4.3.3.5.5, 4.3.3.5.6, a-62443-2-1-2009-security-for-industrial-automat">4.3.3.7.3, SR 2.1, SR 5.2, A.10.1.1, A.11.1.4, A.11.1.5, A.11.2.1, A.13.1.1, A.13.1.3, A.13.2.1, A.13.2.3, A.13.2.4, A.14.1.2, A.14.1.3, A.6.1.2, A.7.1.1, A.7.1.2, A.7.3.1, [ref]
Specifying which accounts are allowed SSH access into the system reduces the possibility of unauthorized access to the system.
SR '/bin/sh -c "/sbin/sulogin; /usr/bin/systemctl --fail --no-block default"' if grep "^ExecStart=.*" "$service_file" ;lect submit keydown keypress keyup error contextmenu".split(" "),func="https://www.isa.org/products/ansi-isa-62443-3-3-99-03-03-2013-security-for-indu">SR 5.2, A.13.1.3, A.13.2.1, Rationale:	Specifying which accounts are allowed SSH access into the system reduces the possibility of unauthorized access to the system.
DSS0s/isa-62443-2-1-2009-security-for-industrial-automat">4.3.3.5.5, A.13.1.3, Rationale:	ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages contain information from the system's route table possibly revealing portions of the network topology. The ability to send ICMP redirects is only appropriate for systems acting as routers.
Severity:	medium
Rule ID:	xccdf_org.ssgproject.content_rule_sysctl_net_ipv4_conf_all_send_redirects
Identifiers and References	References: ansi-isa-62443-3-3-99-03-03-2013-security-for-indu">SR 5.2, A.13.1.3, A.13.2.1, Rationale:

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Remediation Ansible snippet ⇲

tps://www.nerc.com/pa/Stand/Standard%20Purpose%20Statement%20DL/US_Standard_One-Stop-Shop.xlsx">CIP-007-3 R2.3, CIP-007-3 R5.1, CIP-007-3 R5.1.1, CIP-007-3 R5.1.2, SR 2.12,
Complexity:	low
Disruption:	medium
Severity: NIST.SP.800-53r4.pdf">IA-5(1)(c), SC-12(2), SC-12(3), SC-12(3), SC-12(3), Severity:	high
Rule ID:	xccdf_org.ssgproject.content_rule_configure_"">1561, A.18.1.4, 1561, A.18.1.4, 1561, Rule ID:	xccdfperating-systems%2Cgeneral-purpose-os">SRG-OS-000142-GPOS-00071, 3.2.8
FPT_TUD_EXT.1, FPT_a-expanded="false" title="Activate to reveal" href="#! g/Profile/PP.cfm">FPT_TUD_EXT.1, FPT_a-expanded="false" title="Activate to reveal" href="#! g/Profile/PP.cfm">FPT_TUD_EXT.1, FPT_a-expanded="false" title="Activate to reveal" hrefn"#! g/Profile/PP.cfm">FPT_TUD_EXT.1, FPT_a-expanded="false" title="Activate to reveal" hrefn"#! g/Profile/PP.cfm">FPT_TUD_EXT.1, FPT_a-ex{},etag:{},ajaxSettings:{ur>Complexity:, 4.3.3.6.9, 4.3.3.7.1, 4.3.3.7.2, 4.3.3.7.3, 4.3.3.7.4, 4.3.4.3.2, 4.3.4.3.3, 4.4.3.3, SR 1.1, SR 1.10, SR 1.11, SR 1.12, SR 1.13, SR 1.2, SR 1.3, SR 1.4, or `VERBOSE` level is the basic level that only records login activity of SSH users. In many situations, such as Incident Response, it is important to determine when a particular user was active on a system. The logout record can eliminate those users who disconnected, which helps narrow the field.
Severity:	medium
Rule ID:	xccdf_org.ssgproject.content_rule_sshd_set_loglevel_verbose)):(t=y,!b&&y\|\|(y="error",0>b&&(b=0))),w.status=b,w.statusText=(c\|\|y)+"",k?p.resolveWith(m,[s,y,w]):p.rejectWith(m,[w,y,t]),w.statusCode(r),r=void 0,i&&o.trigger(k?"ajaxSuccess":"ajaxError",[w,l,k?s:t]),q.fireWith(m,[w,y]),i&&(o.trigger("ajaxComplete",[w,l]),--n.active\|\|n.event.trigger("ajaxStop")))}return w},getJSON:function(a,b,c){return n.get(a,b,c,"json")},getScript:function(a,b){return n.get(a,void 0,b,"script")}}),n.each(["get","post"],function(a,b){n[b]=function(a,c,d,e){return n.isFunction(c)&&(e=e\|\|d,d=c,c=void 0),n.ajax(n.extend({url:a,type:b,dataType:e,data:c,success:d},n.isPlainObject(a)&&a))}}),n._evalUrl=function(a){return n.ajax({url:a,type:"GET",dataType:"script",cache:!0,async:!1,global:!1,"throws":!0})},n.fn.extend({wrapAll:function(a){if(n.isFunction(a))return this.each(function(b){n(this).wrapAll(a.call(this,b))});if(this[0]){var b=n(a,this[0].ownerDocument).eq(0).clone(!0);this[0].parentNode&&b.insertBefore(this[0]),b.map(function(){var a=this;while(a.firstChild&&1===a.firstChild.nodeType)a=a.firstChild;return a}).append(this)}return this},wrapInner:function(a){return n.isFunction(a)?this.each(function(b){n(this).wrapInner(a.call(this,b))}):this.each(function(){var b=n(this),c=b.contents();c.length?c.wrapAll(a):b.append(a)})},wrap:function(a){var b=n.isFunction(a);return this.each(function(c){n(this).wrapAll(b?a.call(this,c):a)})},unwrap:function(){return this.parent().each(function(){n.nodeName(this,"body3.2.1, A.13.2.2, A.13.2.3, A.13.2.4, A.14.1.2,
Complexity:	low
Disruption:	low
Strategy:	restrict

# Remediation is applicable only in certain platforms
if [ ! -f /.doocumentMode>8?hc():/^(get|post|head|put|delete|options)$/i.test(this.type)&&hc()||ic()}:hc;var ec=0,fc={},gc=n.ajaxSettings.xhr();a.attachEvent&&a.attachEvent("onunload",function(){for(var a in fc)fc[a](void 0,!0)}),l.cors=!!gc&&"withCredentials"in gc,gc=l.ajax=!!gc,gc&&n.ajaxTransport(function(b){if(!b.crossDomain||l.cors){var c;return{send:function(d,e){var f,g=b.xhr(),h=++ec;if(g.open(b.type,b.url,b.async,b.username,b.password),b.xhrFields)for(f in b.xhrFields)g[f]=b.xhrFields[f];b.mimeType&&g.overrideMimeType&&g.overrideMimeType(b.mimeType),b.crossDomain||d["X-Requested-With"]||(d["X-Requested-With"]="XMLHttpRequest");for(f in d)void 0!==d[f]&&g.setRequestHeader(f,d[f]+"");g.send(b.hasContent&&b.data||null),c=function(a,d){var f,i,j;if(c&&(d||4===g.readyState))if(delete fc[h],c=void 0,g.onreadystatechange=n.noop,d)4!==g.readyState&&g.abort();else{j={},f=g.status,"string"==typeof g.responseText&&(j.text=g.responseText);try{i=g.statusText}catch(k){i=""}f||!b.isLocal||b.crossDomain?1223===f&&(f=204):f=j.text?200:404}j&&e(f,i,j,g.getAllResponseHeaders())},b.async?4===g.readyState?a.setTimeout(c):g.onreadystatechange=fc[h]=c:c()},abort:function(){c&&c(void 0,!0)}}}});function hc(){try{return new a.XMLHttpRequest}catch(b){}}function ic(){try{return new a.ActiveXObject("Microsoft.XMLHTTP")}catch(b){}}n.ajaxSetup({accepts:{script:"text/javascript, application/javascript, application/ecmascript, application/x-ecmascript"},contents:{script:/\b(?:java|ecma)script\b/},converters:{"text script":function(a){return n.globalEval(a),a}}}),n.ajaxPrefilter("script",function(a){void 0===a.cache&&(a.cache=!1),a.crossDomain&&(a.type="GET",a.global=!1)}),n.ajaxTransport("script",function(a){if(a.crossDomain){var b,c=d.head||n("heass="table table-striped table-bordered table-condensed">Complexity:lowDisruption:mediumReboot:trueStrategy:disable- name: List /etc/sysctl.d/*.conf files
  find:
    paths:
    - /etc/sysctl.d/
    - /run/sysctl.d/
    - /usr/local/lib/sysctl.d/
    - /usr/lib/sysctl.d/
    contains: ^[\s]*net.ipv4.conf.default.accept_source_route.*$
    patterns: '*.conf'
    file_type: any
  register: find_sysctl_d
  when: ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
  tags:
  - CJIS-5.10.1.1
  - NIST-800-171-3.1.20
  - NIST-800-53-CM-7(a)
  - NIST-800-53-CM-7(b)
  - NIST-800-53-SC-5
  - NIST-800-53-SC-7(a)
  - disable_strategy
  - low_complexity
  - medium_disruption
  - medium_severity
  - reboot_required
  - sysctl_net_ipv4_conf_default_accept_source_route

- name: Comment out any occurrences of net.ipv4.conf.default.accept_source_route from
    config files
  replace:
    path: '{{ item.path }}'
    regexp: ^[\s]*net.ipv4.conf.default.accept_source_route
    replace: '#net.ipv4.conf.default.accept_source_route'
  loop: '{{ find_sysctl_d.files }}'
  when: ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
  tags:
  - CJIS-5.10.1.1
  - NIST-800-171-3.1.20
  - NIST-800-53-CM-7(a)
  - NIST-800-53-CM-7(b)
  - NIST-800-53-SC-5
  - NIST-800-53-SC-7(a)
  - disable_strategy
  - low_complexity
  - medium_disruption
  - medium_severity
  - reboot_required
 ad;n.fn.load=function(a,b,c){if("string"!=typeof a&&lc)return lc.apply(this,arguments);var d,e,f,g=this,h=a.indexa>
-1,j?(d=l.position(),g=d.top,e=d.left):(g=parseFloat(f)||0,e=parseFloat(i)||0),n.isFunceion(b)&&(b=b.call(a,c,n.extend({},h))),null!=b.top&&(m.top=b.top-h.top+g),null!=b
left&&(m.left=b.left-h.left+e),"using"in b?b.using.call(a,m):l.css(m)}},n.fn.extend({offset:function(a){if(arguments.length)return void 0===a?this:this.each(function(b){n.offset.setOffset(this,a,b)});var b,c,d={top:0,left:0},e=this[0],f=e&&e.ownerDocument;if(f)return b=f.d_cumentEleOS-000142-GPOS-00071, 3.2.8
, DSS05.07, DSS06.02, -1,j?(d=l.position(),g=d.top,e=d.left):(g=parseFloat(f)||0,e=parseFloat(i)||0),n.isFunceion(b)&&(b=b.call(a,c,n.extend({},h))),null!=b.top&&(m.top=b.top-h.top+g),null!=b
left&&(m.left=b.left-h.left+e),"using"in b?b.using.call(a,m):l.css(m)}},n.fn.extend({offset:function(a){if(arguments.length)return void 0===a?this:this.each(function(b){n.offset.setOffset(this,a,b)});var b,c,d={top:0,left:0},e=this[0],f=e&&e.ownerDocument;if(f)return b=f.d_cumentEleOS-000142-GPOS-00071, 3.2.8
DE.AE-1, ID.AM-3, CM-7(b), 164.308(b)(1), A.12.1.2, 164.308(b)(2), CM-11(a), CM-11(b), PR.DS-6, PR.DS-8, PR.IP-1, FPT_TUD_EXT.1, FPT_TUD_EXT.2, Req-6.2, SRG-OS-000366-GPOS-00153, SRG-OS-000366-VMM-001430, SRG-OS-000370-VMM-001460, SRG-OS-000404-VMM-001650, 1.2.3
FPT_TUD_EXT.1,  kernel parameter, run the following command: $ sudo sysctl -w net.ipv4.conf.default.log_martians=1
To make sure that the setting is persistent, add the following line to a file in the directory /etc/sysctl.d: net.ipv4.conf.default.log_martians = 1
Rationale: The presence of "martian" packets (which have impossible addresses)
as well as spoofed packets, source-routed packets, and redirects could be a
sign of nefarious network activity. Logging these packets enables this activity
to be detected.
Severity:  unknown
Rule ID:, 4.3.3.7.3, 4.3.3.7.4, 4.3.4.3.2, 4.3.4.3.3, 4.4.3.3, 13, 14, 15, 16, 2, SR 1.2, SR 1.3, SR 1span class="label label-default" title="Provide a reference to a document or resource where the user can learn more about the subject of the Rule or Group.">References: 
            1, 11, 12, 14, 15, 16, 18, 3, 5, 6, 8, 9, 5.5.6, APO11.04, APO13.01, BAI03.05, BAI10.01, BAI10.02, BAI10.03, BAI10.05, DSS01.04, DSS05.02, DSS05.03, DSS05.04, DSS05.05, DSS05.07, DSS05.10, DSS06.03, 3.13.11, 3.13.8, CCI-000068, CCI-000366, CCI-000803his.ancestors().length};e.prototype.parentNode=function(){if(this.parentId!=null){return this.tree[this.parentId]}else{return null}};e.prototype.removeChild=function(g){var f=c.inArray(g,this.children);return this.children.splice(f,ar f}.navbar-inverse .navbar-nav .open .dropdown-menu>li>a{color:#777}.navbar-inverse .navbar-nav .open .dropdown-menu>li>a:hover,.navbar-inverse .navbar-nav .open .dropdown-menu>li>a:focus{color:#fff;background-color:transparent}.navbar-inverse .navbar-nav .open .dropdown-menu>.active>a,.navbar-inverse .navbar-nav .open .dropdown-menu>.active>a:hover,.navbar-inverse .navbar-nav .open .dropdown-menu>.active>le45-vol1-chapA-subchapC.pdf">164.312(e)(2)(i), 164.312(e)(2)(ii), 164.314(b)(2)(i), 4.3.3.2.2, 4.3.3.3.9, 4.3.3.5.1, 4.3.3.5.2, 4.3.3.5.3, 4.3.3.5.4, 4.3.3.5.5, 4.3.3.5.6, 4.3.3.5.74.3.3.5.74.3.3.5.74.3.3.5.74.3.3.5.74.3.3.5.74.3.3.5.7, 164.308(b)(1), 164.308(b)(2), CM-11(a), CM-11(b), PR.DS-6, PR.DS-8, PR.IP-1, FPT_TUD_EXT.1, FPT_TUD_EXT.2, Req-6.2, SRG-OS-000366-GPOS-00153, SRG-OS-000366-VMM-001430, SRG-OS-000370-VMM-001460, SRG-OS-000404-VMM-001650, 1.2.3
4.3.4.4.7, 4.4.2.1, 4.4.2.2, 4.4.2.4, SR 1.1, SR 1.10, SR 1.11, SR 1.12, SR 1.13, SR 1.2, SR 1.3, SR 1.4, SR 1.5, SR 1.6, SR 1.7, SR 1.8, SR 1.9, SR 2.1, SC-12(3), Severity:  high
Rule ID: xccdf_org.ssgproject.content_rule_configure_"">1561, A.18.1.4, 1561, A.18.1.4, 1561, Rule ID: xccdfperating-systems%2Cgeneral-purpose-os">SRG-OS-000142-GPOS-00071, 3.2.8
FPT_TUD_EXT.1, FPT_a-expanded="false" title="Activate to.1="false" t" aria-expahe subject of the Rule or Group.">References: 
            1, 11, 1561, 1443-2-1-2009-security-for-industrial-automat">4.3.3.5.1, .active>le45-vol1-chapA-subcha
OueveClass("collapsing").addClass("collapse in")[g](""),this.transitioning=0,this.$element.trigger("shown
benchmark/as(this.isBrarg/controls/">1443-2-1-2009-security-for-industrial-automat">4.3.3.5.1, , DSS05.07, DSS06.02, -1,j?(d=l.position(),g=d.top,e=d.left):(g=parseFloat(f)||0,e=parseFloat(i)||0),n.isFunceion(b)&&(b=b.call(a,c,n.extend({},h))),null!=b.top&&(m.top=b.top-h.top+g),null!=b
left&&(m.left=b.left-h.left+e),"using"in b?b.using.call(a,m):l.css(m)}},n.fn.extend({offset:function(a){if(arguments.length)return void 0===a?this:this.each(function(b){n.offset.setOffset(this,a,b)});var b,c,d={top:0,left:0},e=this[0],f=e&&e.ownerDocument;if(f)return b=f.d_cumentEleOS-000142-GPOS-00071, 3.2.8
FPT_TUD_EXT.1,  kernel parameter, run the following command: $ sudo sysctl -w net.ipv4.conf.default.log_martians=1
To make sure that the setting is persistent, add the following line to a file in the directory /etc/sysctl.d: net.ipv4.conf.default.log_marl">A.11.1.5, A.11.2.1, A.12.1.1, A.12.1.2, A.13.1.1, A.13.1.2, A.13.1.3, A.13.2.1, A.13.2.2, A.13.2.3, A.13.2.4, A.14.1.2, A.14.1.3, A.6.1.2, A.7.1.1, A.7.1.2, A.7.3.1, A.8.2.2, A.8.2.3, A.9.1.1, A.9.1.2, A.9.2.3, A.9.4.1, A.9.4.4, A.9.4.5, CM-7(a), CM-7(b), CM-6(a), DE.AE-1, ID.AM-3, CM-7(b), CM-6(a), DE.AE-1, SRG-OS-000480-GPOS-00227, 3.2.1
Remediation Ansible snippet ⇲
DE.AE-1, ID.AM-3, CM-7(b), 164.308(b)(1), A.12.1.2, 164.308(b)(2), CM-11(a), CM-11(b), PR.DS-6, PR.DS-8, PR.IP-1, FPT_TUD_EXT.1, FPT_TUD_EXT.2, Req-6.2, SRG-OS-000366-GPOS-00153, SRG-OS-000366-VMM-001430, SRG-OS-000370-VMM-001460, SRG-OS-000404-VMM-001650, 1.2.3
Complexity: low
Disruption: medium
Rebosthis.children.splice(f,ar f}.navbar-inverse .navbar-nav .open .dropdown-menu>li>a{color:#777}.navbar-invevb[b],vb[b]=e,e=null!=c(a,b,d)?b.toLowerCase():null,vb[b]=f),e}:vb[b]=function(a,b,c){return c?void 0:a[n.camelCase("default-"+b)]?b.toLowerCase():null}}),yb&&xb||(n.attrHooks.value={set:function(a,b,c){return n.nodeName(a,"input")?void(a.defaultValue=b):tb&&tb.set(a,b,c)}}),xb||(tb={set:function(a,b,c){var d=a.getAttributeNode(c);return d||a.setAttributeNode(d=a.ownerDocument.createAttribute(c)),d.value=b+="","value"===c||b===a.getAttribute(c)?b:void 0}},vb.id=vb.name=vb.coords=function(a,b,c){var d;return c?void 0:(d=a.getAttributeNode(b))&&""!==d.value?d.value:null},n.valHooks.button={get:function(a,b){var c=a.getAttributeNode(b);return c&&c.specified?c.value:void 0},set:tb.set},n.attrHooks.contenteditable={set:function(a,b,c){tb.set(a,""===b?!1:b,c)}},n.each(["width","height"],function(a,b){n.attrHooks[b]={set:function(a,c){return""===c?(a.setAttribute(b,"auto"),c):void 0}}})),l.style||(n.attrHooks.style={gegetAttributeNode(b);return c&&c.specified?c.value:void 0},set:tb.set},n.attrHooks.contenteditable={set:function(a,b,c){tb.set(a,""===b?!1:b,c)}},n.each(["width","height"],function(a,b){n.attrHooks[b]={set:function(a,c){return""===c?(a.setAttribute(b,"auto"),c):void 0}}})),l.style||(n.attrHooks.style={gegetAttributeNode(b);return c&&c.specified?c.value:void 0},set:tb.set},n.attrHooks.contenteditable={set:function(a,b,c){tb.set(a,""===b?!1:b,c)}},n.each(["width","height"],function(a,b){n.attrHooks[b]={set:function(a,c){return""===c?(a.setAttribute(b,"auto"),c):void 0}}})),l.style||(n.attrHooks.style={gegetAttributeNode(b);return c&&c.specified?c.value:void 0},set:tb.set},n.attrHooks.contenteditable={set:function(a,b,c){tb.set(a,""===b?!1:b,c)}},n.each(["width","height"],function(a,b){n.attrHooks[b]={set:function(a,c){return""===c?(a.setAttribute(b,"auto"),c):void 0}}})),l.style||(n.attrHooks.style={gegetAttributeNode(b);return c&&c.specified?c.value:void 0},set:tb.set},n.attrHooks.contenteditable={set:function(a,b,c){tb.set(a,""===b?!1:b,c)}},n.each(["width","height"],function(a,b){n.attrHooks[b]={set:function(a,c){return"".set(a,""===b?!1:b,c)}},n.each(["width","height"],function(a,b){n.attrHooks[b]={set:function(a,c){return""===c?(a.setAttribute(b,"auto"),c):void 0}}})),l.style||(n.attrHooks.style={gegetAttributeNode(b);rethis}),l.enctype||(n.propFix.enctype="encoding");var Bb=/[\t\r\n\f]/g;function Cb(a){return n.attr(a,"class")||""}n.fn.extend({addClass:function(a){var b,c,d,e,f,g,h,i=0;if(n.isFunction(a))return this.each(function(b){n(this).addClass(a.call(this,b,Cb(this)))});if("string"==typeof a&&a){b=a.match(G)||[];while(c=this[i++])if(e=Cb(c),d=1===c.nodeType&&(" "+e+" ").replace(Bb," ")){g=0;while(f=b[g++])d.indexOf(" "+f+" ")<0&&(d+=f+" ");h=n.trim(d),e!==h&&n.attr(c,"class",h)}}return this},removeClass:function(a){var b,c,d,e,f,g,h,i=0;if(n.isFunction(a))return 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").indexOf(b)>-1)return!0;return!1}}),n.each("blur focus focusin focusout load resize scroll unload clickgleClass:function(a,b){var c=typeof a;return"boolean"==typeof b&&"string"===c?b?this.addClass(a):this.removeClass(a):n.isFunction(a)?this.each(function(c){n(this).toggleClass(a.call(this,c,Cb(this),b),b)}):this.each(function(){var b,d,e,f;if("string"===c){d=0,e=n(this),f=a.match(G)||[];while(b=f[d++])e.hasClass(b)?e.removeClass(b):e.addClass(b)}else void 0!==a&&"boolean"!==c||(b=Cb(this),b&&n._data(this,"__className__",b),n.attr(this,"class",b||a===!1?"":n._data(this,"__classN)me__")||""))})},hasClass:function(a){var b,c,d=0;b=" "+a+" ";while(c=this[d++])if(1===c.nodeType&&(" "+Cb(c)+" ").replace(Bb," ").indexOf(b)>-1)return!0;return!1}}),n.each("blur focus focusin focusout load resize scroll unload clickgleClass:function(a,b){var c=typeof a;ceturn"boolean"==typeof b&&"string"===c?b?this.addClass(a):this.removeClass(a):n.isFunction(a)?this.each(function(c){n(this).toggleClass(a.call(this,c,Cb(this),b),b)}):this.each(function(){var b,d,e,f;if("string"===c){d=0,e=n(this),f=a.match(G)||[];while(b=f[d++])e.hasClass
hdiation is not applicable, nothing was done'
fi
4.3.4.4.7, 4.4.2.1, 4.4.2.2, 4.4.2.4, SR 1.1, SR 1.10, SR 1.11, SR 1.12, SR 1.13, SR 1.2, SR 1.3, SR 1.4, SR 1.5, SR 1.6, Remediation Puppet snippet ⇲
Complexity: low
Disruption: low
Strategy: enable
include enable_firewalld

class enable_firewalld {
  service {'firewalld':
    enable => true,
    ensure => 'running',
  }
}
Remediation Ansible snippet ⇲
Complexity: low
Disruption: low
Strategy: enable
- name: Enable service firewalld
  block:

  - name: Gather the package facts
    package_facts:
      manager: auto

  - name: Enable service firewalld
    service:
      name: firewalld
      enabled: 'yes'
      state: started
      masked: 'no'
    when:
    - '"firewalld" in ansible_facts.packages'
  when: ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
  tags:
  - NIST-800-171-3.1.3
  - NIST-800-171-3.4.7
  - NIST-800-53-AC-4
  - NIST-800-53-CA-3(5)
  - NIST-800-53-CM-6(a)
  - NIST-800-53-CM-7(b)
  - NIST-800-53-SC-7(21)
  - enable_strategy
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - service_firewalld_enabled
Group  
                Strengthen the Default Ruleset
                          Group contains  1 rule
FPT_TUD_EXT.1,  kernel parameter, run the following command: $ sudo sysctl -w net.ipv4.conf.default.log_martians=1
To make sure that the setting is persistent, add the following line to a file in the directory /etc/sysctl.d: net.ipv4.conf.default.log_marl">A.11.1.5, A.11.2.1, A.12.1.1, A.12.1.2, A.13.1.1, A.13.1.2, A.13.1.3, A.13.2.1, A.13.2.2, A.13.2.3, A.13.2.4, A.14.1.2, A.14.1.3, A.6.1.2, A.7.1.1, A.7.1.2, A.7.3.1, A.8.2.2, A.8.2.3, A.9.1.1, A.9.1.2, A.9.2.3, A.9.4.1, A.9.4.4, A.9.4.5, CM-7(a), CM-7(b), CM-6(a), DE.AE-1, 
4.3.4.4.7, 4.4.2.1, 4.4.2.2, 4.4.2.4, SR 1.1, SR 1.10, SR 1.11, SR 1.12, SR 1.13, SR 1.2, SR 1.3, SR 1.4, SR 1.5, SR 1.6, Remediation Puppet snippet ⇲
Complexity: low
Disruption: low
Strategy: enable
include enable_firewalld

class enable_firewalld {
  service {'firewalld':
    enable => true,
    ensure => 'running',
  }
}
Remediation Ansible snippet ⇲
Complexity: low
Disruption: low
Strategy: enable
- name: Enable service firewalld
 '$ lods/td>
Disruption: low
Strategy: enablel){return 1}return 0}}this.data("treetable").sortBranch(j,e);return this},unloadBranch:function(e){this.data("treetable").unloadBranch(e);return this}};c.fn.treetable=function(e){if(a[e]){return a[e].apply(this,Array.prototype.slice.call(arguments,1))}else{if(typeof e==="object"||!e){return a.init.apply(this,arguments)}else{return c.error("Method "+e+" does not exist on jQuery.treetable")}}};this.TreeTable||(this.TreeTable={});this.TreeTable.Node=b;this.TreeTable.Tree=d})(jQuery);
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ibreswan configuration may be
set up to ignore it.

To check that Crypto Policies settings are configured correctly, ensn>.btn,select[multiple].input-group-sm>.form-control,select[multiple].input-group-sm>.input-group-addon,select[multiple].input-group-sm>.input-group-btn>.btn{height:auto}.input-group-addon,.input-group-btn,.input-group .form-control{display:table-cell}.input-group-addon:not(:first-child):not(:last-child),.input-group-btn:not(:first-child):not(:last-child),.input-group .form-control:not(:first-child):not(:last-child){border-radius:0}.input-group-addon,.input-group-btn{width:1%;white-space:nowrap;vertical-align:middle}.input-grou&f.parentNode){if(f.id!==e[2])return A.find(a);this.length=1,this[0]=f}return this.context=d,this.selector=cullapse.collapse{display:block !important;height:auto !">SR 1.1, SR 1.10, SR 1.1, SR 1.10, SR 1.1, SR 1.10, SR 1.1, SR 1.10, SR 1.1, SR 1.10, SR 1.1, SR 1.10, SR 1.1, SR 1.10, SR 1.1, SR 1.10, SR 1.1, SR a>, SR 1.1, A.9.1.2, A.9.2.av .nav-divide="https://www.iso.org/standard/54534.html">A.9.4.1, 14, 15, 
e,g=f?null:[],h=f?e+1:d.length,i=0>e?h:f?e:0;h>i;i++)if(c=d[i],(c.selected||i===e)&&(l.optDisabled?!c.disabled:null===c.getAttribute("disabled"))&&(!c.parentNode.disabled||!n.nodeName(c.parentNode,"optgroup"))){if(b=n(c).val(),f)return b;g.push(b)}return g},set:function(a,b){var c,d,e=a.options,f=n.makeArray(b),g=e.length;while(g--)if(d=e[g],n.inArray(n.valHooks.option.get(d),f)>-1)try{d.selected=c=!0}catch(h){d.scrollHeight}else d.selected=!1;return c||(a.selectedIndex=-1),e}}}}),n.each(["radio","checkbox"],function(){n.valHooks[this]={set:function(a,b){return n.isArray(b)?a.checked=n.inArray(n(a).val(),b)>-1:void 0}},active:hover,.btn-success.active:hover,.open>.dropdown-toggle.lect:{get:function(a){for(var b,c,d=a.options,e=a.selectedIndex,f="select-one"===a.type||0>e,g=f?null:[],h=f?e+1:d.lee,yb=l.input;n.fn.extend({attr:function(a,b){return Y(this,n.attr,a,b,arguments.length>1)},removeAttr:function(a){return this.each(function(){n.removeAttr(this,a)})}}),n.extend({attr:function(a,b,c){var d,e,f=a.nodeType;if(3!==f&&8!==f&&2!==f)return"undefined"2-h>Disruption:lowStrategy:configure1 .1, 7143;border:1px solid transparent;border-radius:4px 4px 0 0}.nav-tabs>li>a:hover{border-colorr:#e5Goducts/ansi-isa-62443-3-3-99-03-03-2013-security-for-indu">SR 1.1, li{position:relative;display:block}.nav>li>a{position:relative;display:block;padding:10px 15px}.nav>li>a:hover,.nav>li>a:focus{text-decoration:none;background-color:#eee}.nav>li.disabled>a{color:#777}.nav>li.disabled>a:hover,.nav>li.disabled>a:focus{color:#777;text-decoration:none;background-color:transparent;cursor:not-allowed}.nav .open>a,.nav .open>a:hover,.nav .open>a:focus{background-color:#eee;border-color:#428bca}.nav .nav-divider{height:1px;margin:9px 0;overflow:hidden;background-color:#e5e5e5}.nav>li>a>img{max-width:none}.nav-tabs{border-bottom:1px solid #ddd}.nav-tabs>li{float:left;margin-bottom:-1px}.nav-tabs>li>a{margin-right:2px;line-height:1.42857143;border:1px solid transparent;border-radius:4px 4px 0 0}.nav-tabs>li>a:hover{border-color:#eee #eee #ddd}.nav-tabs>li.active>a,.nav-tabs>li.active>a:hover,.nav-tabs>li.active>a:focus{color:#555;background-color:#fff;border:1px solid #ddd;border-bottom-color:transparent;cursor:default}.nav-tabs.nav-justified{width:100%;border-bottom:0}.nav-tabs.nav-justified>li{float:none}.nav-tabs.nav-justified>li>a{text-align:center;margin-bottom:5px}.nav-�abs.nav-justified>.dropdown .dropdown-menu{
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�50%, rgba(255,255,255,0.15) 50%, rgba(255,ion ra(){try{return d.activeElement}catch(a){}}function sa(a,b,c,d,e,f){var g,h;if("obcursor:default}.nav-tabs.nav-justified{width:100%;border-bottom:0}.nav-tabs.nav-justrpdown-menu .divider{background-color:#080808}.navbar-inverse .navbar-navbort();else{j={},f=g.status,"string"==typeof g.responseText&&(j.text=g.responseText);trypx}.nav-tabs.nav-justified>.dropdown .dropdown-menu{top:auto;left:auto}@media (min-width:768px){.nav-tabs.r
  - no_reboot_needed

- name: Ensure permission u-xs,g-xwrs,o-xwrt on /etc/cror
ame:/etc/gshadow, run the command:
$ sudo chmod 0000 /etc/gshadow

Rationale:The /etc/gshadow file contains group password hashes. Protection of this file
is critical for system security.
Severity: medium
Rule ID:xccdf_org.ssgproject.content_rule_file_permissions_etc_gshadowIdentifiers and ReferencesReferences: 
            BP28(R36), 12, 13, 14, 15, 16, 18, 3, 5, APO01.06, DSS05.04, DSS05.07, DSS06.02, CCI-002223, 4.3.3.7.3, SR 2.1, SR 5.2, A.10.1.1, A.11.1.4, A.11.1.5, A.11.2.1, A.13.1.1, A.13.1.3, A.13.2.1, A.13.2.3, A.13.2.4, A.14.1.2, PR.PT-3, ").parent().html();b[e].pushtml">A.13.2.1, A.13.2.3, A.13.2.4,  to determine
behavior with regard to password aging, expirat b)void 0!==b[d]&&((e[d]?a:c||(c={}))[d]=b[d]);return c&&n.extend(!0,a,c),a}function Wb(a,b,c){var d,e,f,g,h=a.contents,i=a.dataTypes;while("*"===i[0])i.shift(),void 0===e&&(e=a.mimeType||b.getResponseHeader("Content-Type"));if(e)for(g in h)if(h[g]&&h[g].test(e)){i.unshift(g);break}if(i[0]in c)f=i[0];else{for(g in c){if(!i[0]||a.converters[g+" "+i[0]]){f=g;break}d||(d=g)}f=f||d}return f?(f!==i[0]&&i.unshift(f),c[f]):void 0}function Xb(a,b,c,d){var e,f,g,h,i,j={},k=a.dataTypes.slice();if(k[1])for(g in a.converters)j[g.toLowerCase()]=a.converters[g];f=k.shift();while(f)if(a.responseFields[f]&&(c[a.responseFields[f]]=b),!i&&d&&a.dataFilter&&(b