From 66bcf9223a1506f146065cffd3928612ca81345f Mon Sep 17 00:00:00 2001
From: Oscar Zhou <100548325+oscarzhou-portainer@users.noreply.github.com>
Date: Fri, 14 Mar 2025 11:20:41 +1300
Subject: [PATCH] fix(k8s/config): avoid hardcoded "insecure-skip-tls-verify"
 in kubeconfig [BE-11651] (#500)

---
 api/http/handler/kubernetes/config.go      |  69 +++++++-
 api/http/handler/kubernetes/config_test.go | 186 +++++++++++++++++++++
 2 files changed, 254 insertions(+), 1 deletion(-)
 create mode 100644 api/http/handler/kubernetes/config_test.go

diff --git a/api/http/handler/kubernetes/config.go b/api/http/handler/kubernetes/config.go
index aad9c03a8..a42f98ee3 100644
--- a/api/http/handler/kubernetes/config.go
+++ b/api/http/handler/kubernetes/config.go
@@ -1,9 +1,14 @@
 package kubernetes
 
 import (
+	"crypto/x509"
+	"encoding/pem"
 	"errors"
 	"fmt"
 	"net/http"
+	"net/url"
+	"os"
+	"strings"
 
 	portainer "github.com/portainer/portainer/api"
 	"github.com/portainer/portainer/api/http/security"
@@ -162,11 +167,38 @@ func (handler *Handler) buildConfig(r *http.Request, tokenData *portainer.TokenD
 func (handler *Handler) buildCluster(r *http.Request, endpoint portainer.Endpoint, isInternal bool) clientV1.NamedCluster {
 	kubeConfigInternal := handler.kubeClusterAccessService.GetClusterDetails(r.Host, endpoint.ID, isInternal)
 
+	selfSignedCert := false
+	serverUrl, err := url.Parse(kubeConfigInternal.ClusterServerURL)
+	if err != nil {
+		log.Warn().Err(err).Msg("Failed to parse server URL")
+	}
+
+	if strings.EqualFold(serverUrl.Scheme, "https") {
+		var certPem []byte
+		var err error
+
+		if kubeConfigInternal.CertificateAuthorityData != "" {
+			certPem = []byte(kubeConfigInternal.CertificateAuthorityData)
+		} else if kubeConfigInternal.CertificateAuthorityFile != "" {
+			certPem, err = os.ReadFile(kubeConfigInternal.CertificateAuthorityFile)
+			if err != nil {
+				log.Warn().Err(err).Msg("Failed to open certificate file")
+			}
+		}
+
+		if certPem != nil {
+			selfSignedCert, err = IsSelfSignedCertificate(certPem)
+			if err != nil {
+				log.Warn().Err(err).Msg("Failed to verify if certificate is self-signed")
+			}
+		}
+	}
+
 	return clientV1.NamedCluster{
 		Name: buildClusterName(endpoint.Name),
 		Cluster: clientV1.Cluster{
 			Server:                kubeConfigInternal.ClusterServerURL,
-			InsecureSkipTLSVerify: true,
+			InsecureSkipTLSVerify: selfSignedCert,
 		},
 	}
 }
@@ -215,3 +247,38 @@ func writeFileContent(w http.ResponseWriter, r *http.Request, endpoints []portai
 	w.Header().Set("Content-Disposition", fmt.Sprintf("attachment; %s.json", filenameBase))
 	return response.JSON(w, config)
 }
+
+func IsSelfSignedCertificate(certPem []byte) (bool, error) {
+	if certPem == nil {
+		return false, errors.New("certificate data is empty")
+	}
+
+	if !strings.Contains(string(certPem), "BEGIN CERTIFICATE") {
+		certPem = []byte(fmt.Sprintf("-----BEGIN CERTIFICATE-----\n%s\n-----END CERTIFICATE-----", string(certPem)))
+	}
+
+	block, _ := pem.Decode(certPem)
+	if block == nil {
+		return false, errors.New("failed to decode certificate")
+	}
+
+	cert, err := x509.ParseCertificate(block.Bytes)
+	if err != nil {
+		return false, err
+	}
+
+	if cert.Issuer.String() != cert.Subject.String() {
+		return false, nil
+	}
+
+	roots := x509.NewCertPool()
+	roots.AddCert(cert)
+
+	opts := x509.VerifyOptions{
+		Roots:       roots,
+		CurrentTime: cert.NotBefore,
+	}
+
+	_, err = cert.Verify(opts)
+	return err == nil, err
+}
diff --git a/api/http/handler/kubernetes/config_test.go b/api/http/handler/kubernetes/config_test.go
new file mode 100644
index 000000000..46875a460
--- /dev/null
+++ b/api/http/handler/kubernetes/config_test.go
@@ -0,0 +1,186 @@
+package kubernetes
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestIsSelfSignedCertificate(t *testing.T) {
+
+	tc := []struct {
+		name     string
+		cert     string
+		expected bool
+	}{
+		{
+			name: "portainer self-signed",
+			cert: `-----BEGIN CERTIFICATE-----
+MIIBUTCB+KADAgECAhBB7psNiJlJd/nRCCKUPVenMAoGCCqGSM49BAMCMAAwHhcN
+MjUwMzEzMDQwODI0WhcNMzAwMzEzMDQwODI0WjAAMFkwEwYHKoZIzj0CAQYIKoZI
+zj0DAQcDQgAESdGCaXq0r1GDxF89yKjjLeCIixiPDdXAg+lw4NqAWeJq2AOo+8IH
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+bG9jYWxob3N0hwQAAAAAMAoGCCqGSM49BAMCA0gAMEUCIApLliukFaCZHbc/2pkH
+0VDY+fBMb12jhmVpgKh1Cqg9AiEAwFrMQLUkzATUpiHuukdUg5VsUiMIkWTPLglz
+E4+1dRc=
+-----END CERTIFICATE-----
+`,
+			expected: true,
+		},
+		{
+			name:     "portainer self-signed without header",
+			cert:     `MIIBUzCB+aADAgECAhEAjsskPzuCS5BeHjXGwYqc2jAKBggqhkjOPQQDAjAAMB4XDTI1MDMxMzA0MzQyNloXDTMwMDMxMzA0MzQyNlowADBZMBMGByqGSM49AgEGCCqGSM49AwEHA0IABITD+dNDLYQbLYDE3UMlTzD61OYRSVkVZspdp1MvZITIG4VOxtfQUqcW3P7OHQdoi52GIQ/GM6iDgxwB1BOyi3mjVDBSMA4GA1UdDwEB/wQEAwIFoDATBgNVHSUEDDAKBggrBgEFBQcDATAMBgNVHRMBAf8EAjAAMB0GA1UdEQEB/wQTMBGCCWxvY2FsaG9zdIcEAAAAADAKBggqhkjOPQQDAgNJADBGAiEA8SmyeYLhrnrNLAFcxZp0dk6nMN70XVAfqGnbK/s8NR8CIQDgQdqhfge8QvN2TsH4gg98a9VHDv+RlcOlJ80SS+G/Ww==`,
+			expected: true,
+		},
+		{
+			name: "custom certificate generated by openssl",
+			cert: `-----BEGIN CERTIFICATE-----
+MIIB9TCCAZugAwIBAgIULTkNYfYHiqfOiX7mKOIGxRefx/YwCgYIKoZIzj0EAwIw
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+utpXXnysVGecVXHHKOOl1YhWglmuPvcZhw==
+-----END CERTIFICATE-----`,
+			expected: false,
+		},
+		{
+			name: "google.com certificate",
+			cert: `-----BEGIN CERTIFICATE-----
+MIIOITCCDQmgAwIBAgIQKS0IQxknY8USDjt3IYchljANBgkqhkiG9w0BAQsFADA7
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+-----END CERTIFICATE-----
+`,
+			expected: false,
+		},
+		{
+			name: "let's encrypt certificate",
+			cert: `-----BEGIN CERTIFICATE-----
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+hyH7DsrAtDhiQTOWzUZezBlgCn8hfmA3nX5uKsHyxPPPEQ/GFYOltRD/+34X9kFF
+YNzUjJOP0bGk45I1JbspxRRvtbDpk0+dj2VE2toM8vLRDz3+DB4YB2lFofYlex++
+16xFzOIE+ZW41qBs3G8InsyHADsaFY2CQ9re/kZvenptU/ax1U2a21JJ3TT2DmXW
+AHZYQ5/whVIowsebw1e28I12VhLl2BKn7v4MpCn3GUzBBQAEbJ6TIjHtFKWWnVfH
+FisaUX6N4hMzGZVJOsbH4QVBGuNwUshHiD8MSpbans2w+T4bCe11XayerqxFhTao
+w/pjiPVy
+-----END CERTIFICATE-----
+`,
+			expected: false,
+		},
+	}
+
+	for _, tt := range tc {
+		t.Run(tt.name, func(t *testing.T) {
+			actual, err := IsSelfSignedCertificate([]byte(tt.cert))
+			assert.NoError(t, err)
+			assert.Equal(t, tt.expected, actual)
+		})
+	}
+}