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  1. RHEL
  2. RHEL-1897

anssi_bp28_high profile's audit rules are invalid on aarch64 architecture

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    • Known Issue
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      .ANSSI BP28 HP SCAP rules for Audit are incorrectly used on the 64-bit ARM architecture

      The ANSSI BP28 High profile in the SCAP Security Guide (SSG) contains the following security content automation protocol (SCAP) rules that configure the Linux Audit subsystem but are invalid on the 64-bit ARM architecture:

      * `audit_rules_unsuccessful_file_modification_creat`
      * `audit_rules_unsuccessful_file_modification_open`
      * `audit_rules_file_deletion_events_rename`
      * `audit_rules_file_deletion_events_rmdir`
      * `audit_rules_file_deletion_events_unlink`
      * `audit_rules_dac_modification_chmod`
      * `audit_rules_dac_modification_chown`
      * `audit_rules_dac_modification_lchown`

      If you configure your RHEL system running on a 64-bit ARM machine by using this profile, the Audit daemon does not start due to the use of invalid system calls.

      To work around the problem, either use profile tailoring to remove the previously mentioned rules from the data stream or remove the `-S <syscall>` snippets by editing files in the `/etc/audit/rules.d` directory. The files must not contain the following system calls:

      * creat
      * open
      * rename
      * rmdir
      * unlink
      * chmod
      * chown
      * lchown

      As a result of any of the two described workarounds, the Audit daemon can start even after you use the ANSSI BP28 High profile on a 64-bit ARM system.
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      .ANSSI BP28 HP SCAP rules for Audit are incorrectly used on the 64-bit ARM architecture The ANSSI BP28 High profile in the SCAP Security Guide (SSG) contains the following security content automation protocol (SCAP) rules that configure the Linux Audit subsystem but are invalid on the 64-bit ARM architecture: * `audit_rules_unsuccessful_file_modification_creat` * `audit_rules_unsuccessful_file_modification_open` * `audit_rules_file_deletion_events_rename` * `audit_rules_file_deletion_events_rmdir` * `audit_rules_file_deletion_events_unlink` * `audit_rules_dac_modification_chmod` * `audit_rules_dac_modification_chown` * `audit_rules_dac_modification_lchown` If you configure your RHEL system running on a 64-bit ARM machine by using this profile, the Audit daemon does not start due to the use of invalid system calls. To work around the problem, either use profile tailoring to remove the previously mentioned rules from the data stream or remove the `-S <syscall>` snippets by editing files in the `/etc/audit/rules.d` directory. The files must not contain the following system calls: * creat * open * rename * rmdir * unlink * chmod * chown * lchown As a result of any of the two described workarounds, the Audit daemon can start even after you use the ANSSI BP28 High profile on a 64-bit ARM system.
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      Description of problem:
      anssi_bp28_high profile's audit rules are invalid on aarch64 architecture.

      Version-Release number of selected component (if applicable):
      scap-security-guide-0.1.69-1.el8

      How reproducible:
      deterministic

      Steps to Reproduce:
      1. Remediate installed system using ANSSI High profile:
      oscap xccdf eval --profile xccdf_org.ssgproject.content_profile_anssi_bp28_high --progress --remediate /usr/share/xml/scap/ssg/content/ssg-rhel8-ds.xml
      2. Examine auditd service status

      Actual results:

      1. systemctl status -l auditd
        ● auditd.service - Security Auditing Service
        Loaded: loaded (/usr/lib/systemd/system/auditd.service; enabled; vendor preset: enabled)
        Active: active (running) since Thu 2023-08-17 09:43:05 EDT; 8min ago
        Docs: man:auditd(8)
        https://github.com/linux-audit/audit-documentation
        Process: 769 ExecStartPost=/sbin/augenrules --load (code=exited, status=1/FAILURE)
        Process: 759 ExecStart=/sbin/auditd (code=exited, status=0/SUCCESS)
        Main PID: 766 (auditd)
        Tasks: 2 (limit: 8799)
        Memory: 7.6M
        CGroup: /system.slice/auditd.service
        └─766 /sbin/auditd

      Aug 17 09:43:04 hpe-apollo-cn99xx-14-vm-30.khw4.lab.eng.bos.redhat.com systemd[1]: Starting Security Auditing Service...
      Aug 17 09:43:04 hpe-apollo-cn99xx-14-vm-30.khw4.lab.eng.bos.redhat.com auditd[766]: No plugins found, not dispatching events
      Aug 17 09:43:04 hpe-apollo-cn99xx-14-vm-30.khw4.lab.eng.bos.redhat.com auditd[766]: Init complete, auditd 3.0.7 listening for events (startup state enable)
      Aug 17 09:43:05 hpe-apollo-cn99xx-14-vm-30.khw4.lab.eng.bos.redhat.com augenrules[801]: Syscall name unknown: creat
      Aug 17 09:43:05 hpe-apollo-cn99xx-14-vm-30.khw4.lab.eng.bos.redhat.com augenrules[801]: There was an error in line 7 of /etc/audit/audit.rules
      ====

      1. augenrules --load
        Syscall name unknown: creat
        There was an error in line 7 of /etc/audit/audit.rules
        ====
      1. head -n7 /etc/audit/audit.rules
        1. This file is automatically generated from /etc/audit/rules.d
          -D

      -w /etc/selinux/ -p wa -k MAC-policy
      -a always,exit -F arch=b32 -S creat -S ftruncate -S open -S openat -S truncate -F exit=-EACCES -F auid>=1000 -F auid!=unset -F key=access
      -a always,exit -F arch=b64 -S creat -S ftruncate -S open -S openat -S truncate -F exit=-EACCES -F auid>=1000 -F auid!=unset -F key=access
      ====

      Even after removing the offending line there are still other errors so audit rules on aarch64 architecture need to be revisited and fixed.

      Expected results:
      `augenrules --load` successfully loads all configured audit rules.

      Additional info:

            Unassigned Unassigned
            mmarhefk@redhat.com Matus Marhefka
            SSG Security QE SSG Security QE
            Mirek Jahoda Mirek Jahoda
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              Created:
              Updated: