From 537b45faf36c39ba1b67265eed6d62532270a470 Mon Sep 17 00:00:00 2001
From: Brad Larsen <bradford.larsen@praetorian.com>
Date: Fri, 12 Jul 2024 13:25:49 -0400
Subject: [PATCH] Improve "Base64-PEM-Encoded Private Key" rule

---
 CHANGELOG.md                                                  | 1 +
 .../snapshots/test_noseyparker__rules__rules_list_json-2.snap | 4 ++--
 crates/noseyparker/data/default/builtin/rules/pem.yml         | 1 +
 3 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 444df75b3..a41bb18c5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 - Nosey Parker no longer crashes upon startup when running in environments with less than 4 GiB of RAM ([#202](https://github.com/praetorian-inc/noseyparker/pull/202)).
 
+- The `Base64-PEM-Encoded Private Key` rule has been refined to reduce false positives and avoid a rare performance pitfall.
 
 ## [v0.18.0](https://github.com/praetorian-inc/noseyparker/releases/v0.18.0) (2024-06-27)
 
diff --git a/crates/noseyparker-cli/tests/rules/snapshots/test_noseyparker__rules__rules_list_json-2.snap b/crates/noseyparker-cli/tests/rules/snapshots/test_noseyparker__rules__rules_list_json-2.snap
index 408b6b2d5..e4a4fe255 100644
--- a/crates/noseyparker-cli/tests/rules/snapshots/test_noseyparker__rules__rules_list_json-2.snap
+++ b/crates/noseyparker-cli/tests/rules/snapshots/test_noseyparker__rules__rules_list_json-2.snap
@@ -2012,12 +2012,12 @@ expression: stdout
     },
     {
       "id": "np.pem.2",
-      "structural_id": "42366f4ec7680cca9a038a43d55e7a6033710583",
+      "structural_id": "35bc9170393aecc3777a72fe77e269fc150c91ce",
       "name": "Base64-PEM-Encoded Private Key",
       "syntax": {
         "name": "Base64-PEM-Encoded Private Key",
         "id": "np.pem.2",
-        "pattern": "(?x)\n(\n  (?: LS0tLS1CRUdJTiBSU0EgUFJJVkFURSBLRVktLS0t             (?# prefix of base64 encoding of `-----BEGIN RSA PRIVATE KEY-----` )\n    | LS0tLS1CRUdJTiBEU0EgUFJJVkFURSBLRVktLS0t             (?# prefix of base64 encoding of `-----BEGIN DSA PRIVATE KEY-----` )\n    | LS0tLS1CRUdJTiBFQyBQUklWQVRFIEtFWS0tLS0t             (?# prefix of base64 encoding of `-----BEGIN EC PRIVATE KEY-----` )\n    )\n  [a-zA-Z0-9+/=]{50,}\n)\n",
+        "pattern": "(?x)\n(\n  (?: LS0tLS1CRUdJTiBSU0EgUFJJVkFURSBLRVktLS0t             (?# prefix of base64 encoding of `-----BEGIN RSA PRIVATE KEY-----` )\n    | LS0tLS1CRUdJTiBEU0EgUFJJVkFURSBLRVktLS0t             (?# prefix of base64 encoding of `-----BEGIN DSA PRIVATE KEY-----` )\n    | LS0tLS1CRUdJTiBFQyBQUklWQVRFIEtFWS0tLS0t             (?# prefix of base64 encoding of `-----BEGIN EC PRIVATE KEY-----` )\n    )\n  [a-zA-Z0-9+/=]{50,}\n)\n(?: [^a-zA-Z0-9+/=] | $ )\n",
         "examples": [
           "PRIVATE_KEY_B64=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",
           "    \"privateKey\": \"LS0tLS1CRUdJTiBSU0EgUFJJVkFURSBLRVktLS0tLQpNSUlFb2dJQkFBS0NBUUVBbUhKOEJHdTFYZUZ4aENVQXBrNHNSTVI4RnRTdGtyMEx0OWtWTGNSUjRFWitiOWhHCmR0blJpOFhqV3d5MU5zMHliMkJMdHBpVHZKSFVKTUphWXluZ2ZkZnZhcWhocm1yYm5vV0pLQkxmeUxwTXFNS1EKQ3RialFxbnVrQURJUWVQd2ZGeTNpVHkxd1JkRC9zTUs1U0VtV0Fxb0pZQk50eTFZZzA2UzVkYVlPM2xjY3hrYQpQWjRjcm9McWF6Ny9tU3dDVTR5VWRSb3h4WVF4VG1MZXg5M2tqU09TTmdpK0FXc0lCbjV3UHI0VHNuVHFSeWpIClN2aEdMdk9YREpRYWZRdk56WjFSL1FYMzlOQk9xOEVKZW5pWXdaUm9uNVcvNVhMYW94MFFyUGhrY1BES3A5SVUKeHpJakUwWlNmMStUK1FFbTQ3TkFtSnhvZjFhdGRFVzZDTCtheHdJREFRQUJBb0lCQUQ3enI4REhsWnFSK1NWZgpmbGd1bWRzLzVCb3Rjd3ZRWXlGbFZIaVV4RmEvNVlCY0tDVDJKN0QzWTc1NmplNTJaK2hVTkkvUGk5cG53ZG40CkpBa2xCdDRRcUg0NzBES05UK216TFFOT1gvanM3YkVXdnhLcTBDZjhNbFptN0V0QlRGS2VtdS9pRVJBT2duYVcKcGs0ZUZVNXdBQ1dVU1FObWgxR1p4ZEdCZjFXM1VjUnQxcFRvOEtQTDluZm4vSGJiRFNsQkNVL3VIcWd2TSt2cApmTE03bzRIVDZ1K1ZzU00rWGZqeDhpeE5ZRHdoalNuKzQyZm13d1d3ZzJISHUrdUozZ1pUSWQwRUI1VW9hdUNjCjZUTlVtcEJscjU5UGFmVkZRWUY1S3VxaHJXKzVQaWpHcHBZcXg4Ynl6aFpOQzkwZnl5V0NXcXg2eGFZVm5OdzgKNkJmUXM2a0NnWUVBeVlyRVg1NU1RTzJnWDY2TGwxaGJDMzNzWk1OZzloVG1SK1doSTFjNksvbFZ1TFoyL0RPdwpsYTZ6eHdBU204Z0ZyVUFYbUljV2h2b3FwWGVzNWZzOVZKeDlNT0ZVYVBrckRPQllnY1laMUR6VVNVOHc3SSttCnlyV3hRUkRNajhvSGpRbHVpM0s2MzZucm5RajhxOGkvQ2dranVPcHJGZnliMzVEMFlDdjVXZzBDZ1lFQXdhT3cKRWFhN0l1MjFGa08vbmFjdVhjSnBhNkVlUTNqZFNlNlRQaXZ6bVVXU0haeGJuUy9XSnJaRjQwSExzUWxOZHl0ZgpNTTBKZFU0VmMyR0NVc1pMYjdQSmJwdVRqRERSSHJXV1pCMnhiemF0K3A3N2RzNWlOcXFRcTZ6M0syUVh4Y3ZTCis5am5VZXpDU2Y0N1R1OWNTTW96V3hTMW82b1BPSFdHVFRvdHR5TUNnWUFQdWc1Y3o4TnZoWnR3Ry9TMG1LWnkKSFI5bk5YL0pkQlFNSkRVUXh1dTVKcm16c2psU3NNM2t3RDh6RmlSZGw1d3B5c2lNbEc0RGxsM2hqNWNrVXhpVQpFNm9KT0d3WHpPbTVGWUNTajl6UUhQY0x5V3d0NlgvQWJiRXBQS0JaMEJBS3gyT2k2ZzcvQ1FsanRhSFIzZFphCmVDQWJlOTlqVmRUcit5bTJuM2ZUdVFLQmdBMm5TZ25rbEx0Z3dXMEJkK2hZMm1jWUJ6RGttbXF0Z2dUdGdvcFcKdFFWd3AxM1pJWWlTeituSTNtS295QUVDbytpc01Ua1NyQUVPY1dyQ1RGc2p5anZsRkdYdEtGa3hNLzJUVmpoVwo4NlRnMlNHYnhpVlpaZ2x1dTJhdmVub2Z3NkZadnRXdE5KcE5OR0hkUURkUG4xVXVsTEp1WW1SWTRGdmR4WXQ2CmQ3QzdBb0dBRUsvalFiZ0l3OXFLQUNOZ0JySnB1cU5Ham9JajFoQTRlb29DMXp1bFEyZUpnZ2J5OTBpSDg2VzEKM0xyOVZMVFkyc2JKTzlqekZVR0lOL01BOEhYQTE1a2grZHRibkRsdFRFZGNnenBCRzhCQUZRQ3hQWnBGWHhtZgpDUmhXN1l6RW1IeWJ4R0toR3NOK2M3NUhKTHZFSWwrRTh6eitXRk9xT240dkJXU1ZwSnc9Ci0tLS0tRU5EIFJTQSBQUklWQVRFIEtFWS0tLS0tCg==\","
diff --git a/crates/noseyparker/data/default/builtin/rules/pem.yml b/crates/noseyparker/data/default/builtin/rules/pem.yml
index ecdbe3bb9..0275e7229 100644
--- a/crates/noseyparker/data/default/builtin/rules/pem.yml
+++ b/crates/noseyparker/data/default/builtin/rules/pem.yml
@@ -77,6 +77,7 @@ rules:
         )
       [a-zA-Z0-9+/=]{50,}
     )
+    (?: [^a-zA-Z0-9+/=] | $ )
 
   references:
   - https://en.wikipedia.org/wiki/Privacy-Enhanced_Mail