small patch for issue with rules that have been (incorrecly) copied from Windows

From: Carlos De Avillez <Carlos.DeAvillez@microsoft.com>
To: "linux-audit@redhat.com" <linux-audit@redhat.com>
Subject: small patch for issue with rules that have been (incorrecly) copied from Windows
Date: Fri, 10 Feb 2023 23:37:07 +0000	[thread overview]
Message-ID: <BN7PR21MB163531AF592295002D4D37D98FDE9@BN7PR21MB1635.namprd21.prod.outlook.com> (raw)

Hello,

We have had at least a few instances where customers configured audit rules on Windows, and then incorrectly
moved the resulting '.rules' files to Linux.

These files still had the Windows  line terminator (CRLF). 'augenrules' read them without issues and generated the
/etc/audit/audit.rules file.

But on loading the new audit.rules, 'auditctl -R' will receive a bad return code, and stop loading the rules. The
resulting error is a bit on the cryptic side, and our customers do not seem to catch it easily.

The proposed fix is simple, and resolves the issue when using 'augenrules'. Of course, if someone generates
/etc/audit/audit.rules directly, it could still fail, but I understand that we are moving to using 'augenrules' by
default.

Patch (against current head) is below.

Cheers,

..Carlos..

From 4ccae6353500d3870d4da8905ed01d18d36b066a Mon Sep 17 00:00:00 2001
From: C de-Avillez <cadeavil@microsoft.com>
Date: Fri, 10 Feb 2023 17:16:09 -0600
Subject: [PATCH] augenrules: make sure no lines in *.rules ends in CRLF,
 otherwise 'auditctl -R' will then fail to fully load the rules.

---
 init.d/augenrules | 1 +
 1 file changed, 1 insertion(+)

diff --git a/init.d/augenrules b/init.d/augenrules
index edb2199..f74c6e2 100644
--- a/init.d/augenrules
+++ b/init.d/augenrules
@@ -84,6 +84,7 @@ BEGIN   {
         minus_b = "";
         rest = 0;
 } {
+        sub(/\r$/, "");
         if (length($0) < 1) { next; }
         if (match($0, "^\\s*#")) { next; }
         if (match($0, "^\\s*-e")) { minus_e = $0; next; }
-- 
2.34.1



 
  

  
Carlos
  de Avillez 

  

 
 
  

  
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  Microsoft Azure Technical Support

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