feat: add casdoor as saml idp support (#571)

* feat: add casdoor as saml idp support Signed-off-by: 0x2a <stevesough@gmail.com> * fix: merge code Signed-off-by: 0x2a <stevesough@gmail.com> * fix: modify response value Signed-off-by: Steve0x2a <stevesough@gmail.com> * fix: modify samlResponse generation method Signed-off-by: Steve0x2a <stevesough@gmail.com> * fix: generating a response using etree Signed-off-by: Steve0x2a <stevesough@gmail.com> * fix: change metadata url Signed-off-by: Steve0x2a <stevesough@gmail.com> * fix: modify front-end adaptation Signed-off-by: Steve0x2a <stevesough@gmail.com> * fix: recovering an incorrect override Signed-off-by: Steve0x2a <stevesough@gmail.com> * fix: change the samlResponse location Signed-off-by: Steve0x2a <stevesough@gmail.com> * fix: add relayState support Signed-off-by: Steve0x2a <stevesough@gmail.com>
2025-07-03 04:10:20 +08:00 · 2022-04-08 23:06:48 +08:00
parent 0b546bba5e
commit 15daf5dbfe
15 changed files with 381 additions and 8 deletions
--- a/object/saml_sp.go
+++ b/object/saml_sp.go
@ -0,0 +1,135 @@
+// Copyright 2021 The Casdoor Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package object
+
+import (
+	"crypto/tls"
+	"crypto/x509"
+	"encoding/base64"
+	"fmt"
+	"net/url"
+	"regexp"
+	"strings"
+
+	"github.com/casdoor/casdoor/conf"
+	saml2 "github.com/russellhaering/gosaml2"
+	dsig "github.com/russellhaering/goxmldsig"
+)
+
+func ParseSamlResponse(samlResponse string, providerType string) (string, error) {
+	samlResponse, _ = url.QueryUnescape(samlResponse)
+	sp, err := buildSp(&Provider{Type: providerType}, samlResponse)
+	if err != nil {
+		return "", err
+	}
+	assertionInfo, err := sp.RetrieveAssertionInfo(samlResponse)
+	if err != nil {
+		panic(err)
+	}
+	return assertionInfo.NameID, nil
+}
+
+func GenerateSamlLoginUrl(id, relayState string) (string, string, error) {
+	provider := GetProvider(id)
+	if provider.Category != "SAML" {
+		return "", "", fmt.Errorf("Provider %s's category is not SAML", provider.Name)
+	}
+	sp, err := buildSp(provider, "")
+	if err != nil {
+		return "", "", err
+	}
+	auth := ""
+	method := ""
+	if provider.EnableSignAuthnRequest {
+		post, err := sp.BuildAuthBodyPost(relayState)
+		if err != nil {
+			return "", "", err
+		}
+		auth = string(post[:])
+		method = "POST"
+	} else {
+		auth, err = sp.BuildAuthURL(relayState)
+		if err != nil {
+			return "", "", err
+		}
+		method = "GET"
+	}
+	return auth, method, nil
+}
+
+func buildSp(provider *Provider, samlResponse string) (*saml2.SAMLServiceProvider, error) {
+	certStore := dsig.MemoryX509CertificateStore{
+		Roots: []*x509.Certificate{},
+	}
+	origin := conf.GetConfigString("origin")
+	certEncodedData := ""
+	if samlResponse != "" {
+		certEncodedData = parseSamlResponse(samlResponse, provider.Type)
+	} else if provider.IdP != "" {
+		certEncodedData = provider.IdP
+	}
+	certData, err := base64.StdEncoding.DecodeString(certEncodedData)
+	if err != nil {
+		return nil, err
+	}
+	idpCert, err := x509.ParseCertificate(certData)
+	if err != nil {
+		return nil, err
+	}
+	certStore.Roots = append(certStore.Roots, idpCert)
+	sp := &saml2.SAMLServiceProvider{
+		ServiceProviderIssuer:       fmt.Sprintf("%s/api/acs", origin),
+		AssertionConsumerServiceURL: fmt.Sprintf("%s/api/acs", origin),
+		IDPCertificateStore:         &certStore,
+		SignAuthnRequests:           false,
+		SPKeyStore:                  dsig.RandomKeyStoreForTest(),
+	}
+	if provider.Endpoint != "" {
+		sp.IdentityProviderSSOURL = provider.Endpoint
+		sp.IdentityProviderIssuer = provider.IssuerUrl
+	}
+	if provider.EnableSignAuthnRequest {
+		sp.SignAuthnRequests = true
+		sp.SPKeyStore = buildSpKeyStore()
+	}
+	return sp, nil
+}
+
+func parseSamlResponse(samlResponse string, providerType string) string {
+	de, err := base64.StdEncoding.DecodeString(samlResponse)
+	if err != nil {
+		panic(err)
+	}
+	deStr := strings.Replace(string(de), "\n", "", -1)
+	tagMap := map[string]string{
+		"Aliyun IDaaS": "ds",
+		"Keycloak":     "dsig",
+	}
+	tag := tagMap[providerType]
+	expression := fmt.Sprintf("<%s:X509Certificate>([\\s\\S]*?)</%s:X509Certificate>", tag, tag)
+	res := regexp.MustCompile(expression).FindStringSubmatch(deStr)
+	return res[1]
+}
+
+func buildSpKeyStore() dsig.X509KeyStore {
+	keyPair, err := tls.LoadX509KeyPair("object/token_jwt_key.pem", "object/token_jwt_key.key")
+	if err != nil {
+		panic(err)
+	}
+	return &dsig.TLSCertKeyStore{
+		PrivateKey:  keyPair.PrivateKey,
+		Certificate: keyPair.Certificate,
+	}
+}