feat: make allow-domains optional (blocks all traffic when not specified) by Copilot · Pull Request #80 · github/gh-aw-firewall

Copilot · 2025-12-02T01:19:40Z

Makes the --allow-domains argument optional. When no domains are specified, all outbound traffic is blocked by default for security.

Changes Made

CLI (src/cli.ts)

Removed requirement for at least one domain to be specified

Added warnings when no domains specified:

⚠️  WARNING: No domains specified - all outbound traffic will be BLOCKED
    Use --allow-domains or --allow-domains-file to allow specific domains

Domain validation is conditional (only runs when domains are provided)
Log message updated: Allowed domains: (none specified - all traffic blocked)

Squid Config Generator (src/squid-config.ts)

Handles empty domains array by generating "deny all" rule
When domains array is empty: blocks all outbound traffic
When domains are specified: supports plain domains and wildcard patterns using dstdomain and dstdom_regex ACLs

Tests (src/squid-config.test.ts)

Added "Empty Domains (Block All)" test suite
Validates that empty domains array results in traffic being blocked
All 350 tests passing

Behavior

With domains specified: Traffic restricted to allowed domains (supports wildcards like *.github.com)
Without domains specified: All outbound traffic is blocked (secure by default)

Integration with Main Branch

Merged latest changes from main (v0.6.0):

Wildcard domain support (*.github.com, api-*.example.com)
DNS server restrictions via --dns-servers flag
Log management features
Domain pattern validation via validateDomainOrPattern()

Testing

✅ All 350 tests passing
✅ Build successful
✅ Linting passes
✅ CodeQL security scan (no issues)
✅ Manual verification of blocking behavior when no domains specified

Example

# Without domains - blocks all traffic
awf -- curl https://anywhere.com  # Blocked with warnings

# With domains - allows specified domains
awf --allow-domains github.com -- curl https://api.github.com  # Allowed

# With wildcards
awf --allow-domains "*.github.com,api-*.example.com" -- curl https://api.github.com  # Allowed

Original prompt

make allow-domains a not required argument

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.

Co-authored-by: Mossaka <5447827+Mossaka@users.noreply.github.com>

Mossaka · 2025-12-03T00:00:19Z

@copilot pull the latest from main branch and commit and push

github-actions · 2025-12-03T00:00:20Z

Test Coverage Report

Metric	Coverage	Covered/Total
Lines	49.01%	275/561
Statements	48.78%	280/574
Functions	54.83%	34/62
Branches	41.43%	75/181

Coverage Thresholds

The project has the following coverage thresholds configured:

Lines: 38%
Statements: 38%
Functions: 35%
Branches: 30%

Coverage report generated by `npm run test:coverage`

Mossaka

@copilot please address all the comments

Mossaka · 2025-12-03T00:01:14Z

src/cli.ts

+    if (allowedDomains.length > 0) {
+      logger.info(`Allowed domains: ${allowedDomains.join(', ')}`);
+    } else {
+      logger.info('Allowed domains: (all domains allowed)');


shouldn't this be "all domains are not allowed?"

Fixed in commit 0305e94. Changed the message from "(all domains allowed)" to "(none specified - all traffic allowed)" to make it clearer that when no domains are specified, the firewall allows all traffic (no filtering is applied).

@copilot I thought when no domains are specified, then everything should be blocked, that's not the case?

You're right to question this! The current implementation allows all traffic when no domains are specified (with warnings).

However, blocking all traffic when no domains are specified would be more secure. The original requirement said "make allow-domains optional" which I interpreted as allowing the tool to run without domains, but I can change it to block everything instead.

Which behavior would you prefer?

Current (permissive): No domains = allow all traffic with warnings

Secure (restrictive): No domains = block all traffic

If you want option 2, I'll update the code to block all traffic when no domains are specified.

I want option 2 @copilot

Implemented option 2 in commit 7532d22! When no domains are specified, all outbound traffic is now BLOCKED.

The changes include:

Warning message: "⚠️ WARNING: No domains specified - all outbound traffic will be BLOCKED"

Log message: "Allowed domains: (none specified - all traffic blocked)"

Squid config: Generates "deny all" rule when domains array is empty

Tests updated to verify blocking behavior

All 350 tests passing.

Integrates wildcard domain support and DNS server restrictions from main with the optional domains feature. Resolves merge conflicts by combining both features - domains are now optional, and when specified, support wildcards like *.github.com and api-*.example.com. Co-authored-by: Mossaka <5447827+Mossaka@users.noreply.github.com>

Copilot · 2025-12-03T00:10:54Z

@copilot pull the latest from main branch and commit and push

Done! Merged latest changes from main branch in commit 651576e.

The merge integrates:

Wildcard domain support (.github.com, api-.example.com)
DNS server restrictions
Our optional domains feature

All 259 tests passing. The optional domains feature now works with wildcards - when domains are specified, they're validated for wildcard patterns, and when no domains are specified, all traffic is allowed with security warnings.

Co-authored-by: Mossaka <5447827+Mossaka@users.noreply.github.com>

Copilot · 2025-12-03T00:15:38Z

@copilot please address all the comments

Addressed the code review comment in commit 0305e94. The log message at line 520 now reads "(none specified - all traffic allowed)" to clarify that when no domains are provided, all traffic is allowed.

- Merged latest changes from main branch (v0.6.0) including log management features - Changed behavior: when no domains specified, all traffic is now BLOCKED (option 2) - Updated warning messages to reflect blocking behavior - Updated tests to match new blocking behavior - All 350 tests passing Co-authored-by: Mossaka <5447827+Mossaka@users.noreply.github.com>

Copilot · 2025-12-04T00:08:01Z

@copilot pull the latest from main branch and commit and push

Done in commit 7532d22! Merged latest from main branch (v0.6.0) which includes log management features and other improvements.

Initial plan

ba59796

Copilot AI assigned Copilot and Mossaka Dec 2, 2025

Copilot started work on behalf of Mossaka December 2, 2025 01:20 View session

Copilot AI and others added 3 commits December 2, 2025 01:27

feat: make allow-domains argument optional

91e1fd1

Co-authored-by: Mossaka <5447827+Mossaka@users.noreply.github.com>

docs: improve security warning messages for no domains

d3e4731

Co-authored-by: Mossaka <5447827+Mossaka@users.noreply.github.com>

fix: improve grammar in warning messages

10b7804

Co-authored-by: Mossaka <5447827+Mossaka@users.noreply.github.com>

Copilot AI changed the title ~~[WIP] Make allow-domains argument optional~~ feat: make allow-domains optional Dec 2, 2025

Copilot finished work on behalf of Mossaka December 2, 2025 01:35

Copilot AI requested a review from Mossaka December 2, 2025 01:35

Mossaka marked this pull request as ready for review December 2, 2025 23:59

Copilot started work on behalf of Mossaka December 3, 2025 00:00 View session

Mossaka requested changes Dec 3, 2025

View reviewed changes

Copilot AI requested a review from Mossaka December 3, 2025 00:12

Copilot finished work on behalf of Mossaka December 3, 2025 00:12

Copilot started work on behalf of Mossaka December 3, 2025 00:12 View session

fix: clarify log message for empty domains

0305e94

Co-authored-by: Mossaka <5447827+Mossaka@users.noreply.github.com>

Copilot finished work on behalf of Mossaka December 3, 2025 00:17

Copilot started work on behalf of Mossaka December 3, 2025 23:08 View session

Copilot finished work on behalf of Mossaka December 3, 2025 23:12

Copilot started work on behalf of Mossaka December 3, 2025 23:53 View session

Copilot AI changed the title ~~feat: make allow-domains optional~~ feat: make allow-domains optional (blocks all traffic when not specified) Dec 4, 2025

Copilot finished work on behalf of Mossaka December 4, 2025 00:10

Mossaka closed this Dec 4, 2025

github-actions bot mentioned this pull request Apr 5, 2026

📊 Copilot Token Usage Report2026-04-05 #1676

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feat: make allow-domains optional (blocks all traffic when not specified)#80

feat: make allow-domains optional (blocks all traffic when not specified)#80
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