Merge pull request #7 from cerberauth/create-docker-images

build: add dockerfile and push to ghcr

.github/workflows/ci.yml

@@ -0,0 +1,55 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  list-challenges:
+    runs-on: ubuntu-latest
+
+    outputs:
+      matrix: ${{ steps.set-matrix.outputs.matrix }}
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - id: set-matrix
+        run: echo "matrix=$(ls challenges/ | jq -R -s -c 'split("\n")[:-1]')" >> $GITHUB_OUTPUT
+
+  docker-build-push:
+    needs: list-challenges
+    runs-on: ubuntu-latest
+
+    permissions:
+      packages: write
+
+    strategy:
+      matrix:
+        challenge: ${{ fromJson(needs.list-challenges.outputs.matrix) }}
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: ./challenges/${{ matrix.challenge }}
+          push: ${{ github.ref == 'refs/heads/main' }}
+          tags: ghcr.io/cerberauth/api-vulns-challenges/${{ matrix.challenge }}:latest
+          cache-from: type=registry,ref=ghcr.io/cerberauth/api-vulns-challenges/${{ matrix.challenge }}:latest
+          cache-to: type=inline

challenges/jwt-alg-none-bypass/Dockerfile

@@ -0,0 +1,23 @@
+FROM golang:1.21 AS builder
+
+WORKDIR /app
+
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . ./
+
+RUN CGO_ENABLED=0 GOOS=linux GO111MODULE=on go build -o /jwt-alg-none-bypass .
+
+FROM gcr.io/distroless/static-debian11:nonroot AS runner
+
+WORKDIR /
+
+COPY --from=builder --chown=nonroot:nonroot /jwt-alg-none-bypass /usr/bin/jwt-alg-none-bypass
+
+EXPOSE 8080
+
+USER nonroot:nonroot
+
+ENTRYPOINT ["jwt-alg-none-bypass", "serve"]
+CMD ["jwt-alg-none-bypass"]

challenges/jwt-alg-none-bypass/serve/server.go

@@ -31,7 +31,7 @@ func RunServer() {
 			}
 
 			if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
-				return nil, fmt.Errorf("Unexpected signing method: %v", token.Header["alg"])
+				return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
 			}
 
 			return []byte("my_secret_key"), nil
@@ -45,6 +45,5 @@ func RunServer() {
 		}
 	})
 
-	log.Println("starting server")
 	log.Fatal(http.ListenAndServe(":8080", nil))
 }

challenges/jwt-weak-hmac-secret/Dockerfile

@@ -0,0 +1,23 @@
+FROM golang:1.21 AS builder
+
+WORKDIR /app
+
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . ./
+
+RUN CGO_ENABLED=0 GOOS=linux GO111MODULE=on go build -o /jwt-weak-hmac-secret .
+
+FROM gcr.io/distroless/static-debian11:nonroot AS runner
+
+WORKDIR /
+
+COPY --from=builder --chown=nonroot:nonroot /jwt-weak-hmac-secret /usr/bin/jwt-weak-hmac-secret
+
+EXPOSE 8080
+
+USER nonroot:nonroot
+
+ENTRYPOINT ["jwt-weak-hmac-secret", "serve"]
+CMD ["jwt-weak-hmac-secret"]

challenges/jwt-weak-hmac-secret/serve/server.go

@@ -26,7 +26,7 @@ func RunServer() {
 		tokenString := strings.TrimSpace(parts[1])
 		token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
 			if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
-				return nil, fmt.Errorf("Unexpected signing method: %v", token.Header["alg"])
+				return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
 			}
 
 			return []byte("secret"), nil
@@ -40,6 +40,5 @@ func RunServer() {
 		}
 	})
 
-	log.Println("starting server")
 	log.Fatal(http.ListenAndServe(":8080", nil))
 }