fix: validate client cert paths exist on disk before proceeding

2 files changed, 44 insertions, 29 deletions

diff --git a/client/httpclient.go b/client/httpclient.go
index f2e82e5..15bae25 100644
--- a/client/httpclient.go
+++ b/client/httpclient.go
@@ -5,9 +5,11 @@ import (
 	"crypto/tls"
 	"crypto/x509"
 	"errors"
+	"fmt"
 	"io/ioutil"
 	"net"
 	"net/http"
+	"os"
 	"path/filepath"
 	"strings"
 	"time"
@@ -25,6 +27,10 @@ const (
 	defaultReadTimeoutSeconds = 300
 )
 
+var (
+	ErrCafileNotFound = errors.New("cafile not found")
+)
+
 type HttpClient struct {
 	*http.Client
 	Host string
@@ -60,15 +66,6 @@ func NewHTTPClient(gitlabURL, gitlabRelativeURLRoot, caFile, caPath string, self
 
 // NewHTTPClientWithOpts builds an HTTP client using the provided options
 func NewHTTPClientWithOpts(gitlabURL, gitlabRelativeURLRoot, caFile, caPath string, selfSignedCert bool, readTimeoutSeconds uint64, opts []HTTPClientOpt) (*HttpClient, error) {
-	hcc := &httpClientCfg{
-		caFile: caFile,
-		caPath: caPath,
-	}
-
-	for _, opt := range opts {
-		opt(hcc)
-	}
-
 	var transport *http.Transport
 	var host string
 	var err error
@@ -77,6 +74,19 @@ func NewHTTPClientWithOpts(gitlabURL, gitlabRelativeURLRoot, caFile, caPath stri
 	} else if strings.HasPrefix(gitlabURL, httpProtocol) {
 		transport, host = buildHttpTransport(gitlabURL)
 	} else if strings.HasPrefix(gitlabURL, httpsProtocol) {
+		hcc := &httpClientCfg{
+			caFile: caFile,
+			caPath: caPath,
+		}
+
+		for _, opt := range opts {
+			opt(hcc)
+		}
+
+		if _, err := os.Stat(caFile); err != nil {
+			return nil, fmt.Errorf("cannot find cafile '%s': %w", caFile, ErrCafileNotFound)
+		}
+
 		transport, host, err = buildHttpsTransport(*hcc, selfSignedCert, gitlabURL)
 		if err != nil {
 			return nil, err
diff --git a/client/httpsclient_test.go b/client/httpsclient_test.go
index 48efa91..be1d49c 100644
--- a/client/httpsclient_test.go
+++ b/client/httpsclient_test.go
@@ -28,10 +28,7 @@ func TestSuccessfulRequests(t *testing.T) {
 		{
 			desc:   "Valid CaPath",
 			caPath: path.Join(testhelper.TestRoot, "certs/valid"),
-		},
-		{
-			desc:       "Self signed cert option enabled",
-			selfSigned: true,
+			caFile: path.Join(testhelper.TestRoot, "certs/valid/server.crt"),
 		},
 		{
 			desc:       "Invalid cert with self signed cert option enabled",
@@ -51,7 +48,8 @@ func TestSuccessfulRequests(t *testing.T) {
 
 	for _, tc := range testCases {
 		t.Run(tc.desc, func(t *testing.T) {
-			client := setupWithRequests(t, tc.caFile, tc.caPath, tc.clientCAPath, tc.clientCertPath, tc.clientKeyPath, tc.selfSigned)
+			client, err := setupWithRequests(t, tc.caFile, tc.caPath, tc.clientCAPath, tc.clientCertPath, tc.clientKeyPath, tc.selfSigned)
+			require.NoError(t, err)
 
 			response, err := client.Get(context.Background(), "/hello")
 			require.NoError(t, err)
@@ -68,13 +66,15 @@ func TestSuccessfulRequests(t *testing.T) {
 
 func TestFailedRequests(t *testing.T) {
 	testCases := []struct {
-		desc   string
-		caFile string
-		caPath string
+		desc          string
+		caFile        string
+		caPath        string
+		expectedError string
 	}{
 		{
-			desc:   "Invalid CaFile",
-			caFile: path.Join(testhelper.TestRoot, "certs/invalid/server.crt"),
+			desc:          "Invalid CaFile",
+			caFile:        path.Join(testhelper.TestRoot, "certs/invalid/server.crt"),
+			expectedError: "Internal API unreachable",
 		},
 		{
 			desc:   "Invalid CaPath",
@@ -87,17 +87,21 @@ func TestFailedRequests(t *testing.T) {
 
 	for _, tc := range testCases {
 		t.Run(tc.desc, func(t *testing.T) {
-			client := setupWithRequests(t, tc.caFile, tc.caPath, "", "", "", false)
-
-			_, err := client.Get(context.Background(), "/hello")
-			require.Error(t, err)
-
-			require.Equal(t, err.Error(), "Internal API unreachable")
+			client, err := setupWithRequests(t, tc.caFile, tc.caPath, "", "", "", false)
+			if tc.caFile == "" {
+				require.Error(t, err)
+				require.ErrorIs(t, err, ErrCafileNotFound)
+			} else {
+				_, err = client.Get(context.Background(), "/hello")
+				require.Error(t, err)
+
+				require.Equal(t, err.Error(), tc.expectedError)
+			}
 		})
 	}
 }
 
-func setupWithRequests(t *testing.T, caFile, caPath, clientCAPath, clientCertPath, clientKeyPath string, selfSigned bool) *GitlabNetClient {
+func setupWithRequests(t *testing.T, caFile, caPath, clientCAPath, clientCertPath, clientKeyPath string, selfSigned bool) (*GitlabNetClient, error) {
 	testhelper.PrepareTestRootDir(t)
 
 	requests := []testserver.TestRequestHandler{
@@ -119,10 +123,11 @@ func setupWithRequests(t *testing.T, caFile, caPath, clientCAPath, clientCertPat
 	}
 
 	httpClient, err := NewHTTPClientWithOpts(url, "", caFile, caPath, selfSigned, 1, opts)
-	require.NoError(t, err)
+	if err != nil {
+		return nil, err
+	}
 
 	client, err := NewGitlabNetClient("", "", "", httpClient)
-	require.NoError(t, err)
 
-	return client
+	return client, err
 }