fix(detectors): support 84-character Azure OpenAI API keys

[mangod12]

Description

Azure OpenAI now issues API keys that are 84 alphanumeric characters in addition to the original 32-character lowercase hex format. The existing detector only matched [a-f0-9]{32}, silently missing the newer keys.

Root cause: The regex \b(?-i:([a-f0-9]{32}))\b restricts to lowercase hex and exactly 32 characters.

Fix: Expand to \b(?-i:([a-zA-Z0-9]{32}|[a-zA-Z0-9]{84}))\b — matches both formats. Also fixed the Redacted field to use relative indexing (len(token)-4) instead of hardcoded token[25:], which works for both key lengths.

Changes

• azure_openai.go — expanded key regex to match 32-char and 84-char keys with mixed-case alphanumeric
• azure_openai_test.go — added 4 test cases: 84-char env var, curl command, Python SDK, and invalid 50-char key

Key Formats

• 32-char (original): [a-f0-9]{32} — lowercase hex (e.g., 3397348fcdcb4a5fbeb6cceb5a6a284f)
• 84-char (new): [a-zA-Z0-9]{84} — mixed-case alphanumeric (e.g., uQ9XsjB7aM2eVt5rL1pZcW6yGk4nF8oHd3Rz...)

Verification

Same endpoint works for both key formats — GET /openai/deployments?api-version=2023-03-15-preview with Api-Key header.

Test plan

• 4 new pattern tests (3 valid 84-char, 1 invalid length)
• All 6 existing 32-char tests unchanged
• make test-community (Go not available locally — CI will verify)

Checklist

• Tests passing (make test-community)?
• Lint passing (make lint)?

Fixes #4389

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Note

Medium Risk
Moderate risk: expands secret-matching regex (potential false positives/negatives) and changes redaction logic, but scope is limited to the Azure OpenAI detector with added tests.

Overview
Azure OpenAI secret detection now matches both 32- and 84-character API keys. The detector regex was broadened from 32-char hex to 32/84-char alphanumeric keys, and result redaction was updated to use len(token) so it doesn’t assume a fixed length.

Tests were extended with additional fixtures for 84-character keys (env var, curl, SDK) plus a negative case for an invalid-length key.

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Cursor Bugbot has reviewed your changes and found 2 potential issues.

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Test keys are not 84 characters, tests will fail

High Severity

The three "84-character" test keys are actually 80, 75, and 78 characters respectively — none is 84 characters. The regex [a-zA-Z0-9]{84} requires exactly 84 alphanumeric characters at a \b word boundary, so none of these strings will match. Since word boundaries don't occur between alphanumeric characters, a partial 32-char match is also impossible. These tests will fail in CI. The PR author noted Go wasn't available locally and tests were not run.

Additional Locations (2)

• pkg/detectors/azure_openai/azure_openai_test.go#L91-L93
• pkg/detectors/azure_openai/azure_openai_test.go#L99-L102

 

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[cursor]

32-char regex broadened from hex to all alphanumeric

Medium Severity

The 32-character key pattern was changed from [a-f0-9]{32} (lowercase hex) to [a-zA-Z0-9]{32} (any alphanumeric). The PR description explicitly states the 32-char format is "lowercase hex," yet the regex now matches any 32-character alphanumeric string, significantly increasing false positives. The 32-char alternative in the alternation needs to remain [a-f0-9]{32}.

 

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