Limit privilege escalation and token theft in workflows

https://lists.openssf-vuln.org/g/siren/message/6

- Added explicit permissions blocks to restrict access (mostly contents: read, id-token: write).
- Limited event triggers to only trusted branches
- Added workflow_dispatch where missing.

Author: DimitriPapadopoulos

.github/workflows/check_changelogs.yml

@@ -2,6 +2,10 @@ name: Check changelog entries
 
 on:
   pull_request:
+  workflow_dispatch:
+
+permissions:
+  contents: read
 
 jobs:
   check-changelogs:

.github/workflows/gpu_test.yml

@@ -13,6 +13,9 @@ on:
 env:
   LD_LIBRARY_PATH: /usr/local/cuda/extras/CUPTI/lib64:/usr/local/cuda/lib64
 
+permissions:
+  contents: read
+
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true

.github/workflows/hypothesis.yaml

@@ -9,6 +9,9 @@ on:
     - cron: "0 0 * * *" # Daily “At 00:00” UTC
   workflow_dispatch: # allows you to trigger manually
 
+permissions:
+  contents: read
+
 env:
   FORCE_COLOR: 3
 

.github/workflows/lint.yml

@@ -7,6 +7,9 @@ on:
     branches: [main, 3.1.x]
   workflow_dispatch:
 
+permissions:
+  contents: read
+
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true

.github/workflows/needs_release_notes.yml

@@ -2,6 +2,7 @@ name: "Pull Request Labeler"
 
 on:
   - pull_request_target
+      types: [opened, reopened, synchronize]
 
 jobs:
   labeler:

.github/workflows/nightly_wheels.yml

@@ -6,6 +6,9 @@ on:
     - cron: '0 2 * * *'
   workflow_dispatch:
 
+permissions:
+  contents: read
+
 jobs:
   build_and_upload_nightly:
     name: Build and upload nightly wheels

.github/workflows/releases.yml

@@ -1,6 +1,14 @@
 name: Wheels
 
-on: [push, pull_request]
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  workflow_dispatch:
+
+permissions:
+  contents: read
 
 jobs:
 

.github/workflows/test.yml

@@ -10,6 +10,9 @@ on:
     branches: [ main, 3.1.x ]
   workflow_dispatch:
 
+permissions:
+  contents: read
+
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
@@ -150,4 +153,4 @@ jobs:
           contains(needs.*.result, 'cancelled')
         run: exit 1
       - name: Success
-        run: echo Success!
+        run: echo Success!