Use shlex to parse command arguments

go.mod

@@ -12,6 +12,7 @@ require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.2.0 // indirect
 	github.com/goccy/go-json v0.10.2 // indirect
+	github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510 // indirect
 	github.com/lestrrat-go/backoff/v2 v2.0.8 // indirect
 	github.com/lestrrat-go/blackmagic v1.0.2 // indirect
 	github.com/lestrrat-go/httpcc v1.0.1 // indirect

go.sum

@@ -8,6 +8,8 @@ github.com/goccy/go-json v0.10.2 h1:CrxCmQqYDkv1z7lO7Wbh2HN93uovUHgrECaO5ZrCXAU=
 github.com/goccy/go-json v0.10.2/go.mod h1:6MelG93GURQebXPDq3khkgXZkazVtN9CRI+MGFi0w8I=
 github.com/golang-jwt/jwt/v5 v5.2.1 h1:OuVbFODueb089Lh128TAcimifWaLhJwVflnrgM17wHk=
 github.com/golang-jwt/jwt/v5 v5.2.1/go.mod h1:pqrtFR0X4osieyHYxtmOUWsAWrfe1Q5UVIyoH402zdk=
+github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510 h1:El6M4kTTCOh6aBiKaUGG7oYTSPP8MxqL4YI3kZKwcP4=
+github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510/go.mod h1:pupxD2MaaD3pAXIBCelhxNneeOaAeabZDe5s4K6zSpQ=
 github.com/lestrrat-go/backoff/v2 v2.0.8 h1:oNb5E5isby2kiro9AgdHLv5N5tint1AnDVVf2E2un5A=
 github.com/lestrrat-go/backoff/v2 v2.0.8/go.mod h1:rHP/q/r9aT27n24JQLa7JhSQZCKBBOiM/uP402WwN8Y=
 github.com/lestrrat-go/blackmagic v1.0.2 h1:Cg2gVSc9h7sz9NOByczrbUvLopQmXrfFx//N+AkAr5k=

main.go

@@ -9,12 +9,17 @@ import (
 	"net/http"
 	"os"
 	"os/exec"
-	"strings"
 
 	"github.com/golang-jwt/jwt/v5"
+	"github.com/google/shlex"
 	"github.com/lestrrat-go/jwx/jwk"
 )
 
+func init() {
+	// call getArgs early to fail on a bad config
+	getArgs()
+}
+
 func main() {
 	if os.Getenv("JWKS_URI") == "" {
 		log.Fatal("JWKS_URI is required. e.g. JWKS_URI=https://gitlab.com/oauth/discovery/keys")
@@ -84,11 +89,7 @@ func Rollout(w http.ResponseWriter, r *http.Request) {
 	if name == "" {
 		name = "/bin/bash"
 	}
-	args := os.Getenv("ROLLOUT_ARGS")
-	if args == "" {
-		args = "/rollout.sh"
-	}
-	cmd := exec.Command(name, strings.Split(args, " ")...)
+	cmd := exec.Command(name, getArgs()...)
 
 	var stdOut, stdErr bytes.Buffer
 	cmd.Stdout = &stdOut
@@ -162,3 +163,16 @@ func strInSlice(e string, s []string) bool {
 	}
 	return false
 }
+
+func getArgs() []string {
+	args := os.Getenv("ROLLOUT_ARGS")
+	if args == "" {
+		args = "/rollout.sh"
+	}
+	rolloutArgs, err := shlex.Split(args)
+	if err != nil {
+		log.Fatalf("Error parsing ROLLOUT_ARGS %s: %v", args, err)
+	}
+
+	return rolloutArgs
+}

main_test.go

@@ -18,6 +18,11 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
+var (
+	kid, claim, aud string
+	privateKey      *rsa.PrivateKey
+)
+
 // createJWKS creates a JWKS JSON representation with a single RSA key.
 func mockJWKS(pub *rsa.PublicKey, kid string) (string, error) {
 	jwks := struct {
@@ -80,6 +85,23 @@ func setupMockJwksServer(pub *rsa.PublicKey, kid string) *httptest.Server {
 	return httptest.NewServer(handler)
 }
 
+func createMockJwksServer() *httptest.Server {
+	var publicKey *rsa.PublicKey
+	var err error
+
+	os.Setenv("JWT_AUD", "test-success")
+	kid = "no-kidding"
+	aud = os.Getenv("JWT_AUD")
+	claim = "bar"
+	privateKey, publicKey, err = GenerateRSAKeys()
+	if err != nil {
+		log.Fatalf("Unable to generate RSA keys: %v", err)
+	}
+	testServer := setupMockJwksServer(publicKey, kid)
+	os.Setenv("JWKS_URI", fmt.Sprintf("%s/oauth/discovery/keys", testServer.URL))
+	return testServer
+}
+
 func CreateSignedJWT(kid, aud, claim string, exp int64, privateKey *rsa.PrivateKey) (string, error) {
 	// Define the claims of the token. You can add more claims based on your needs.
 	claims := jwt.MapClaims{
@@ -114,6 +136,8 @@ func createRequest(authHeader string) *http.Request {
 // TestRollout tests the Rollout function with various scenarios
 func TestRollout(t *testing.T) {
 	testFile := "/tmp/rollout-test.txt"
+
+	// have our test rollout cmd just touch a file
 	os.Setenv("ROLLOUT_CMD", "touch")
 	os.Setenv("ROLLOUT_ARGS", testFile)
 
@@ -123,19 +147,8 @@ func TestRollout(t *testing.T) {
 		log.Fatalf("Unable to cleanup test file: %v", err)
 	}
 
-	// mock the JWKS server response
-	os.Setenv("JWT_AUD", "test-success")
-	kid := "no-kidding"
-	aud := os.Getenv("JWT_AUD")
-	claim := "bar"
-	privateKey, publicKey, err := GenerateRSAKeys()
-	if err != nil {
-		log.Fatalf("Unable to generate RSA keys: %v", err)
-	}
-	server := setupMockJwksServer(publicKey, kid)
-	defer server.Close()
-	jwkURL := fmt.Sprintf("%s/oauth/discovery/keys", server.URL)
-	os.Setenv("JWKS_URI", jwkURL)
+	s := createMockJwksServer()
+	defer s.Close()
 
 	// get a valid token
 	exp := time.Now().Add(time.Hour * 1).Unix()
@@ -179,13 +192,13 @@ func TestRollout(t *testing.T) {
 		t.Fatalf("Unable to create a JWT with our test key: %v", err)
 	}
 
-	// Define test cases
 	tests := []struct {
 		name           string
 		authHeader     string
 		expectedStatus int
 		expectedBody   string
 		claim          map[string]string
+		cmdArgs        string
 	}{
 		{
 			name:           "No Authorization Header",
@@ -235,6 +248,13 @@ func TestRollout(t *testing.T) {
 			expectedStatus: http.StatusOK,
 			expectedBody:   "Rollout complete\n",
 		},
+		{
+			name:           "Rollout cmd with quotes parsed correctly",
+			authHeader:     "Bearer " + jwtToken,
+			expectedStatus: http.StatusOK,
+			cmdArgs:        `/tmp/rollout-shlex-test /tmp/"rollout test filename wrapped in quotes"`,
+			expectedBody:   "Rollout complete\n",
+		},
 		{
 			name:           "Valid Token and Successful Command",
 			authHeader:     "Bearer " + jwtToken,
@@ -250,25 +270,36 @@ func TestRollout(t *testing.T) {
 				os.Setenv("CUSTOM_CLAIMS", "")
 			} else {
 				os.Setenv("CUSTOM_CLAIMS", `{"foo": "bar"}`)
-
 			}
+			if tt.cmdArgs != "" {
+				os.Setenv("ROLLOUT_ARGS", tt.cmdArgs)
+			}
+
 			Rollout(recorder, request)
 
 			assert.Equal(t, tt.expectedStatus, recorder.Code)
 			assert.Equal(t, tt.expectedBody, recorder.Body.String())
 		})
 	}
 
-	// make sure the rollout command actually ran the command
-	_, err = os.Stat(testFile)
-	if err != nil && os.IsNotExist(err) {
-		t.Errorf("The successful test did not create the expected file")
+	testFiles := []string{
+		testFile,
+		"/tmp/rollout-shlex-test",
+		`/tmp/rollout test filename wrapped in quotes`,
 	}
+	for _, f := range testFiles {
+		// make sure the rollout command actually ran the command
+		// which creates the file
+		_, err = os.Stat(f)
+		if err != nil && os.IsNotExist(err) {
+			t.Errorf("The successful test did not create the expected file %s", f)
+		}
 
-	// cleanup
-	err = RemoveFileIfExists(testFile)
-	if err != nil {
-		log.Fatalf("Unable to cleanup test file: %v", err)
+		// cleanup
+		err = RemoveFileIfExists(f)
+		if err != nil {
+			log.Fatalf("Unable to cleanup test file: %v", err)
+		}
 	}
 }