Potential fix for code scanning alert no. 7: Missing regular expression anchor

[FortiShield]

Potential fix for https://github.com/khulnasoft/cloudexploit/security/code-scanning/7

Use a fully anchored regex so the whole origin.DomainName must match an expected S3 hostname format, instead of allowing matches in the middle of larger strings.

Best fix in this file: replace line 55’s pattern with an anchored one:

• From: /s3(.*)\.amazonaws\.com/
• To: /^s3(?:[.-].*)?\.amazonaws\.com$/

This preserves current behavior of allowing regional/variant S3 hostnames that begin with s3 and end with .amazonaws.com, while preventing arbitrary prefixes/suffixes from being accepted. No new imports or helper methods are needed.

Suggested fixes powered by Copilot Autofix. Review carefully before merging.

Summary by Sourcery

Bug Fixes:

• Tighten the S3 origin DomainName regular expression to prevent partial or embedded matches that could trigger false positives in public origin detection.

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Anchors and tightens the S3 origin hostname regular expression used when identifying public S3 origins for CloudFront distributions, ensuring the full DomainName strictly matches expected S3 host formats instead of matching substrings within larger hostnames.

Flow diagram for tightened S3 origin hostname regex check

flowchart TD
    A[distribution.Origins.Items loop] --> B{origin.DomainName exists}
    B -->|no| E[skip origin]
    B -->|yes| C{"origin.DomainName.match(/^s3(?:[.-].*)?\.amazonaws\.com$/)"}
    C -->|no| E
    C -->|yes| D{S3OriginConfig present and
OriginAccessIdentity empty and
no OriginAccessControlId}
    D -->|no| E
    D -->|yes| F[push origin to publicOrigins]

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File-Level Changes

Change	Details	Files
Tighten S3 origin hostname validation by using a fully anchored regular expression when matching CloudFront origin DomainName values.	Replace a loose /s3(.*)\.amazonaws\.com/ regex with a stricter /^s3(?:[.-].*)?\.amazonaws\.com$/ pattern so the entire hostname must conform to expected S3 naming. Preserve support for regional and variant S3 hostnames that begin with s3 and end with .amazonaws.com while preventing arbitrary prefixes or suffixes from matching. Keep the surrounding public S3 origin detection logic unchanged, relying solely on the updated regex for improved correctness and security.	plugins/aws/cloudfront/publicS3Origin.js

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud