feat: support CAS with organizations and applications (#621)

authz/authz.go

@@ -101,6 +101,7 @@ p, *, *, GET, /.well-known/openid-configuration, *, *
 p, *, *, *, /.well-known/jwks, *, *
 p, *, *, GET, /api/get-saml-login, *, *
 p, *, *, POST, /api/acs, *, *
+p, *, *, *, /cas, *, *
 `
 
 		sa := stringadapter.NewAdapter(ruleText)

controllers/account.go

@@ -29,6 +29,7 @@ const (
 	ResponseTypeCode    = "code"
 	ResponseTypeToken   = "token"
 	ResponseTypeIdToken = "id_token"
+	ResponseTypeCas     = "cas"
 )
 
 type RequestForm struct {

controllers/auth.go

@@ -83,8 +83,25 @@ func (c *ApiController) HandleLoggedIn(application *object.Application, user *ob
 			resp = tokenToResponse(token)
 		}
 
+	} else if form.Type == ResponseTypeCas {
+		//not oauth but CAS SSO protocol
+		service := c.Input().Get("service")
+		resp = wrapErrorResponse(nil)
+		if service != "" {
+			st, err := object.GenerateCasToken(userId, service)
+			if err != nil {
+				resp = wrapErrorResponse(err)
 			} else {
-		resp = &Response{Status: "error", Msg: fmt.Sprintf("Unknown response type: %s", form.Type)}
+				resp.Data = st
+			}
+		}
+		if application.EnableSigninSession || application.HasPromptPage() {
+			// The prompt page needs the user to be signed in
+			c.SetSessionUsername(userId)
+		}
+
+	} else {
+		resp = wrapErrorResponse(fmt.Errorf("Unknown response type: %s", form.Type))
 	}
 
 	// if user did not check auto signin

controllers/cas.go

@@ -0,0 +1,204 @@
+// Copyright 2022 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 controllers
+
+import (
+	"fmt"
+	"net/http"
+	"net/url"
+	"strings"
+
+	"github.com/casdoor/casdoor/object"
+)
+
+const (
+	InvalidRequest           string = "INVALID_REQUEST"
+	InvalidTicketSpec        string = "INVALID_TICKET_SPEC"
+	UnauthorizedServiceProxy string = "UNAUTHORIZED_SERVICE_PROXY"
+	InvalidProxyCallback     string = "INVALID_PROXY_CALLBACK"
+	InvalidTicket            string = "INVALID_TICKET"
+	InvalidService           string = "INVALID_SERVICE"
+	InteralError             string = "INTERNAL_ERROR"
+	UnauthorizedService      string = "UNAUTHORIZED_SERVICE"
+)
+
+func (c *RootController) CasValidate() {
+	ticket := c.Input().Get("ticket")
+	service := c.Input().Get("service")
+	c.Ctx.Output.Header("Content-Type", "text/html; charset=utf-8")
+	if service == "" || ticket == "" {
+		c.Ctx.Output.Body([]byte("no\n"))
+		return
+	}
+	if ok, response, issuedService := object.GetCasTokenByTicket(ticket); ok {
+		//check whether service is the one for which we previously issued token
+		if issuedService == service {
+			c.Ctx.Output.Body([]byte(fmt.Sprintf("yes\n%s\n", response.User)))
+			return
+		}
+
+	}
+	//token not found
+	c.Ctx.Output.Body([]byte("no\n"))
+}
+
+func (c *RootController) CasServiceAndProxyValidate() {
+	ticket := c.Input().Get("ticket")
+	format := c.Input().Get("format")
+	service := c.Input().Get("service")
+	pgtUrl := c.Input().Get("pgtUrl")
+
+	serviceResponse := object.CasServiceResponse{
+		Xmlns: "http://www.yale.edu/tp/cas",
+	}
+
+	//check whether all required parameters are met
+	if service == "" || ticket == "" {
+		c.sendCasAuthenticationResponseErr(InvalidRequest, "service and ticket must exist", format)
+		return
+	}
+
+	//find the token
+	if ok, response, issuedService := object.GetCasTokenByTicket(ticket); ok {
+
+		//check whether service is the one for which we previously issued token
+		if strings.HasPrefix(service, issuedService) {
+			serviceResponse.Success = response
+		} else {
+			//service not match
+			c.sendCasAuthenticationResponseErr(InvalidService, fmt.Sprintf("service %s and %s does not match", service, issuedService), format)
+			return
+		}
+	} else {
+		//token not found
+		c.sendCasAuthenticationResponseErr(InvalidTicket, fmt.Sprintf("Ticket %s not recognized", ticket), format)
+		return
+	}
+
+	if pgtUrl != "" && serviceResponse.Failure == nil {
+		//that means we are in proxy web flow
+		pgt := object.StoreCasTokenForPgt(serviceResponse.Success, service)
+		pgtiou := serviceResponse.Success.ProxyGrantingTicket
+		//todo: check whether it is https
+		pgtUrlObj, err := url.Parse(pgtUrl)
+		if pgtUrlObj.Scheme != "https" {
+			c.sendCasAuthenticationResponseErr(InvalidProxyCallback, "callback is not https", format)
+			return
+		}
+		//make a request to pgturl passing pgt and pgtiou
+		if err != nil {
+			c.sendCasAuthenticationResponseErr(InteralError, err.Error(), format)
+			return
+		}
+		param := pgtUrlObj.Query()
+		param.Add("pgtId", pgt)
+		param.Add("pgtIou", pgtiou)
+		pgtUrlObj.RawQuery = param.Encode()
+
+		request, err := http.NewRequest("GET", pgtUrlObj.String(), nil)
+		if err != nil {
+			c.sendCasAuthenticationResponseErr(InteralError, err.Error(), format)
+			return
+		}
+
+		resp, err := http.DefaultClient.Do(request)
+		if err != nil || !(resp.StatusCode >= 200 && resp.StatusCode < 400) {
+			//failed to send request
+			c.sendCasAuthenticationResponseErr(InvalidProxyCallback, err.Error(), format)
+			return
+		}
+	}
+	// everything is ok, send the response
+	if format == "json" {
+		c.Data["json"] = serviceResponse
+		c.ServeJSON()
+	} else {
+		c.Data["xml"] = serviceResponse
+		c.ServeXML()
+	}
+}
+
+func (c *RootController) CasProxy() {
+	pgt := c.Input().Get("pgt")
+	targetService := c.Input().Get("targetService")
+	format := c.Input().Get("format")
+	if pgt == "" || targetService == "" {
+		c.sendCasProxyResponseErr(InvalidRequest, "pgt and targetService must exist", format)
+		return
+	}
+
+	ok, authenticationSuccess, issuedService := object.GetCasTokenByPgt(pgt)
+	if !ok {
+		c.sendCasProxyResponseErr(UnauthorizedService, "service not authorized", format)
+		return
+	}
+
+	newAuthenticationSuccess := authenticationSuccess.DeepCopy()
+	if newAuthenticationSuccess.Proxies == nil {
+		newAuthenticationSuccess.Proxies = &object.CasProxies{}
+	}
+	newAuthenticationSuccess.Proxies.Proxies = append(newAuthenticationSuccess.Proxies.Proxies, issuedService)
+	proxyTicket := object.StoreCasTokenForProxyTicket(&newAuthenticationSuccess, targetService)
+
+	serviceResponse := object.CasServiceResponse{
+		Xmlns: "http://www.yale.edu/tp/cas",
+		ProxySuccess: &object.CasProxySuccess{
+			ProxyTicket: proxyTicket,
+		},
+	}
+
+	if format == "json" {
+		c.Data["json"] = serviceResponse
+		c.ServeJSON()
+	} else {
+		c.Data["xml"] = serviceResponse
+		c.ServeXML()
+	}
+
+}
+func (c *RootController) sendCasProxyResponseErr(code, msg, format string) {
+	serviceResponse := object.CasServiceResponse{
+		Xmlns: "http://www.yale.edu/tp/cas",
+		ProxyFailure: &object.CasProxyFailure{
+			Code:    code,
+			Message: msg,
+		},
+	}
+	if format == "json" {
+		c.Data["json"] = serviceResponse
+		c.ServeJSON()
+	} else {
+		c.Data["xml"] = serviceResponse
+		c.ServeXML()
+	}
+}
+
+func (c *RootController) sendCasAuthenticationResponseErr(code, msg, format string) {
+	serviceResponse := object.CasServiceResponse{
+		Xmlns: "http://www.yale.edu/tp/cas",
+		Failure: &object.CasAuthenticationFailure{
+			Code:    code,
+			Message: msg,
+		},
+	}
+
+	if format == "json" {
+		c.Data["json"] = serviceResponse
+		c.ServeJSON()
+	} else {
+		c.Data["xml"] = serviceResponse
+		c.ServeXML()
+	}
+}

go.mod

@@ -25,7 +25,6 @@ require (
 	github.com/robfig/cron/v3 v3.0.1
 	github.com/russellhaering/gosaml2 v0.6.0
 	github.com/russellhaering/goxmldsig v1.1.1
-	github.com/satori/go.uuid v1.2.0 // indirect
 	github.com/smartystreets/goconvey v1.6.4 // indirect
 	github.com/stretchr/testify v1.7.0
 	github.com/tealeg/xlsx v1.0.5

go.sum

@@ -79,8 +79,6 @@ github.com/casbin/casbin/v2 v2.30.1 h1:P5HWadDL7olwUXNdcuKUBk+x75Y2eitFxYTcLNKeK
 github.com/casbin/casbin/v2 v2.30.1/go.mod h1:vByNa/Fchek0KZUgG5wEsl7iFsiviAYKRtgrQfcJqHg=
 github.com/casbin/xorm-adapter/v2 v2.5.1 h1:BkpIxRHKa0s3bSMx173PpuU7oTs+Zw7XmD0BIta0HGM=
 github.com/casbin/xorm-adapter/v2 v2.5.1/go.mod h1:AeH4dBKHC9/zYxzdPVHhPDzF8LYLqjDdb767CWJoV54=
-github.com/casdoor/go-sms-sender v0.0.5 h1:9qhlMM+UoSOvvY7puUULqSHBBA7fbe02Px/tzchQboo=
-github.com/casdoor/go-sms-sender v0.0.5/go.mod h1:TMM/BsZQAa+7JVDXl2KqgxnzZgCjmHEX5MBN662mM5M=
 github.com/casdoor/go-sms-sender v0.2.0 h1:52bin4EBOPzOee64s9UK7jxd22FODvT9/+Y/Z+PSHpg=
 github.com/casdoor/go-sms-sender v0.2.0/go.mod h1:fsZsNnALvFIo+HFcE1U/oCQv4ZT42FdglXKMsEm3WSk=
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=

object/token_cas.go

@@ -0,0 +1,236 @@
+// Copyright 2022 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 (
+	"encoding/json"
+	"encoding/xml"
+	"fmt"
+	"math/rand"
+	"sync"
+	"time"
+
+	"github.com/casdoor/casdoor/util"
+)
+
+type CasServiceResponse struct {
+	XMLName      xml.Name `xml:"cas:serviceResponse" json:"-"`
+	Xmlns        string   `xml:"xmlns:cas,attr"`
+	Failure      *CasAuthenticationFailure
+	Success      *CasAuthenticationSuccess
+	ProxySuccess *CasProxySuccess
+	ProxyFailure *CasProxyFailure
+}
+
+type CasAuthenticationFailure struct {
+	XMLName xml.Name `xml:"cas:authenticationFailure" json:"-"`
+	Code    string   `xml:"code,attr"`
+	Message string   `xml:",innerxml"`
+}
+
+type CasAuthenticationSuccess struct {
+	XMLName             xml.Name           `xml:"cas:authenticationSuccess" json:"-"`
+	User                string             `xml:"cas:user"`
+	ProxyGrantingTicket string             `xml:"cas:proxyGrantingTicket,omitempty"`
+	Proxies             *CasProxies        `xml:"cas:proxies"`
+	Attributes          *CasAttributes     `xml:"cas:attributes"`
+	ExtraAttributes     []*CasAnyAttribute `xml:",any"`
+}
+
+type CasProxies struct {
+	XMLName xml.Name `xml:"cas:proxies" json:"-"`
+	Proxies []string `xml:"cas:proxy"`
+}
+
+type CasAttributes struct {
+	XMLName                                xml.Name  `xml:"cas:attributes" json:"-"`
+	AuthenticationDate                     time.Time `xml:"cas:authenticationDate"`
+	LongTermAuthenticationRequestTokenUsed bool      `xml:"cas:longTermAuthenticationRequestTokenUsed"`
+	IsFromNewLogin                         bool      `xml:"cas:isFromNewLogin"`
+	MemberOf                               []string  `xml:"cas:memberOf"`
+	UserAttributes                         *CasUserAttributes
+	ExtraAttributes                        []*CasAnyAttribute `xml:",any"`
+}
+
+type CasUserAttributes struct {
+	XMLName       xml.Name             `xml:"cas:userAttributes" json:"-"`
+	Attributes    []*CasNamedAttribute `xml:"cas:attribute"`
+	AnyAttributes []*CasAnyAttribute   `xml:",any"`
+}
+
+type CasNamedAttribute struct {
+	XMLName xml.Name `xml:"cas:attribute" json:"-"`
+	Name    string   `xml:"name,attr,omitempty"`
+	Value   string   `xml:",innerxml"`
+}
+
+type CasAnyAttribute struct {
+	XMLName xml.Name
+	Value   string `xml:",chardata"`
+}
+
+type CasAuthenticationSuccessWrapper struct {
+	AuthenticationSuccess *CasAuthenticationSuccess // the token we issued
+	Service               string                    //to which service this token is issued
+}
+
+type CasProxySuccess struct {
+	XMLName     xml.Name `xml:"cas:proxySuccess" json:"-"`
+	ProxyTicket string   `xml:"cas:proxyTicket"`
+}
+type CasProxyFailure struct {
+	XMLName xml.Name `xml:"cas:proxyFailure" json:"-"`
+	Code    string   `xml:"code,attr"`
+	Message string   `xml:",innerxml"`
+}
+
+//st is short for service ticket
+var stToServiceResponse sync.Map
+
+//pgt is short for proxy granting ticket
+var pgtToServiceResponse sync.Map
+
+func StoreCasTokenForPgt(token *CasAuthenticationSuccess, service string) string {
+	pgt := fmt.Sprintf("PGT-%s", util.GenerateId())
+	pgtToServiceResponse.Store(pgt, &CasAuthenticationSuccessWrapper{
+		AuthenticationSuccess: token,
+		Service:               service,
+	})
+	return pgt
+}
+
+func GenerateId() {
+	panic("unimplemented")
+}
+
+func GetCasTokenByPgt(pgt string) (bool, *CasAuthenticationSuccess, string) {
+	if responseWrapperType, ok := pgtToServiceResponse.LoadAndDelete(pgt); ok {
+		responseWrapperTypeCast := responseWrapperType.(*CasAuthenticationSuccessWrapper)
+		return true, responseWrapperTypeCast.AuthenticationSuccess, responseWrapperTypeCast.Service
+	}
+	return false, nil, ""
+}
+
+func GetCasTokenByTicket(ticket string) (bool, *CasAuthenticationSuccess, string) {
+	if responseWrapperType, ok := stToServiceResponse.LoadAndDelete(ticket); ok {
+		responseWrapperTypeCast := responseWrapperType.(*CasAuthenticationSuccessWrapper)
+		return true, responseWrapperTypeCast.AuthenticationSuccess, responseWrapperTypeCast.Service
+	}
+	return false, nil, ""
+}
+
+func StoreCasTokenForProxyTicket(token *CasAuthenticationSuccess, targetService string) string {
+	proxyTicket := fmt.Sprintf("PT-%s", util.GenerateId())
+	stToServiceResponse.Store(proxyTicket, &CasAuthenticationSuccessWrapper{
+		AuthenticationSuccess: token,
+		Service:               targetService,
+	})
+	return proxyTicket
+}
+
+func GenerateCasToken(userId string, service string) (string, error) {
+
+	if user := GetUser(userId); user != nil {
+		authenticationSuccess := CasAuthenticationSuccess{
+			User: user.Name,
+			Attributes: &CasAttributes{
+				AuthenticationDate: time.Now(),
+				UserAttributes:     &CasUserAttributes{},
+			},
+			ProxyGrantingTicket: fmt.Sprintf("PGTIOU-%s", util.GenerateId()),
+		}
+		data, _ := json.Marshal(user)
+		tmp := map[string]string{}
+		json.Unmarshal(data, &tmp)
+		for k, v := range tmp {
+			if v != "" {
+				authenticationSuccess.Attributes.UserAttributes.Attributes = append(authenticationSuccess.Attributes.UserAttributes.Attributes, &CasNamedAttribute{
+					Name:  k,
+					Value: v,
+				})
+			}
+		}
+		st := fmt.Sprintf("ST-%d", rand.Int())
+		stToServiceResponse.Store(st, &CasAuthenticationSuccessWrapper{
+			AuthenticationSuccess: &authenticationSuccess,
+			Service:               service,
+		})
+		return st, nil
+	} else {
+		return "", fmt.Errorf("invalid user Id")
+	}
+
+}
+
+func (c *CasAuthenticationSuccess) DeepCopy() CasAuthenticationSuccess {
+	res := *c
+	//copy proxy
+	if c.Proxies != nil {
+		tmp := c.Proxies.DeepCopy()
+		res.Proxies = &tmp
+	}
+	if c.Attributes != nil {
+		tmp := c.Attributes.DeepCopy()
+		res.Attributes = &tmp
+	}
+	res.ExtraAttributes = make([]*CasAnyAttribute, len(c.ExtraAttributes))
+	for i, e := range c.ExtraAttributes {
+		tmp := *e
+		res.ExtraAttributes[i] = &tmp
+	}
+	return res
+}
+
+func (c *CasProxies) DeepCopy() CasProxies {
+	res := CasProxies{
+		Proxies: make([]string, len(c.Proxies)),
+	}
+	copy(res.Proxies, c.Proxies)
+	return res
+}
+
+func (c *CasAttributes) DeepCopy() CasAttributes {
+	res := *c
+	if c.MemberOf != nil {
+		res.MemberOf = make([]string, len(c.MemberOf))
+		copy(res.MemberOf, c.MemberOf)
+	}
+	tmp := c.UserAttributes.DeepCopy()
+	res.UserAttributes = &tmp
+
+	res.ExtraAttributes = make([]*CasAnyAttribute, len(c.ExtraAttributes))
+	for i, e := range c.ExtraAttributes {
+		tmp := *e
+		res.ExtraAttributes[i] = &tmp
+	}
+	return res
+
+}
+
+func (c *CasUserAttributes) DeepCopy() CasUserAttributes {
+	res := CasUserAttributes{
+		AnyAttributes: make([]*CasAnyAttribute, len(c.AnyAttributes)),
+		Attributes:    make([]*CasNamedAttribute, len(c.Attributes)),
+	}
+	for i, a := range c.AnyAttributes {
+		var tmp = *a
+		res.AnyAttributes[i] = &tmp
+	}
+	for i, a := range c.Attributes {
+		var tmp = *a
+		res.Attributes[i] = &tmp
+	}
+	return res
+}

routers/authz_filter.go

@@ -100,10 +100,17 @@ func willLog(subOwner string, subName string, method string, urlPath string, obj
 	return true
 }
 
+func getUrlPath(urlPath string) string {
+	if strings.HasPrefix(urlPath, "/cas") && (strings.HasSuffix(urlPath, "/serviceValidate") || strings.HasSuffix(urlPath, "/proxy") || strings.HasSuffix(urlPath, "/proxyValidate") || strings.HasSuffix(urlPath, "/validate")) {
+		return "/cas"
+	}
+	return urlPath
+}
+
 func AuthzFilter(ctx *context.Context) {
 	subOwner, subName := getSubject(ctx)
 	method := ctx.Request.Method
-	urlPath := ctx.Request.URL.Path
+	urlPath := getUrlPath(ctx.Request.URL.Path)
 	objOwner, objName := getObject(ctx)
 
 	isAllowed := authz.IsAllowed(subOwner, subName, method, urlPath, objOwner, objName)

routers/router.go

@@ -171,4 +171,10 @@ func initAPI() {
 
 	beego.Router("/.well-known/openid-configuration", &controllers.RootController{}, "GET:GetOidcDiscovery")
 	beego.Router("/.well-known/jwks", &controllers.RootController{}, "*:GetJwks")
+
+	beego.Router("/cas/:organization/:application/serviceValidate", &controllers.RootController{}, "GET:CasServiceAndProxyValidate")
+	beego.Router("/cas/:organization/:application/proxyValidate", &controllers.RootController{}, "GET:CasServiceAndProxyValidate")
+	beego.Router("/cas/:organization/:application/proxy", &controllers.RootController{}, "GET:CasProxy")
+	beego.Router("/cas/:organization/:application/validate", &controllers.RootController{}, "GET:CasValidate")
+
 }

routers/static_filter.go

@@ -27,6 +27,9 @@ func StaticFilter(ctx *context.Context) {
 	if strings.HasPrefix(urlPath, "/api/") || strings.HasPrefix(urlPath, "/.well-known/") {
 		return
 	}
+	if strings.HasPrefix(urlPath, "/cas") && (strings.HasSuffix(urlPath, "/serviceValidate") || strings.HasSuffix(urlPath, "/proxy") || strings.HasSuffix(urlPath, "/proxyValidate") || strings.HasSuffix(urlPath, "/validate")) {
+		return
+	}
 
 	path := "web/build"
 	if urlPath == "/" {

web/craco.config.js

@@ -18,6 +18,22 @@ module.exports = {
       '/.well-known/openid-configuration': {
         target: 'http://localhost:8000',
         changeOrigin: true,
+      },
+      '/cas/serviceValidate': {
+        target: 'http://localhost:8000',
+        changeOrigin: true,
+      },
+      '/cas/proxyValidate': {
+        target: 'http://localhost:8000',
+        changeOrigin: true,
+      },
+      '/cas/proxy': {
+        target: 'http://localhost:8000',
+        changeOrigin: true,
+      },
+      '/cas/validate': {
+        target: 'http://localhost:8000',
+        changeOrigin: true,
       }
     },
   },

web/src/App.js

@@ -68,6 +68,7 @@ import i18next from 'i18next';
 import PromptPage from "./auth/PromptPage";
 import OdicDiscoveryPage from "./auth/OidcDiscoveryPage";
 import SamlCallback from './auth/SamlCallback';
+import CasLogout from "./auth/CasLogout";
 
 const { Header, Footer } = Layout;
 
@@ -642,7 +643,8 @@ class App extends Component {
       window.location.pathname.startsWith("/login") ||
       window.location.pathname.startsWith("/callback") ||
       window.location.pathname.startsWith("/prompt") ||
-      window.location.pathname.startsWith("/forget");
+      window.location.pathname.startsWith("/forget") ||
+      window.location.pathname.startsWith("/cas");
   }
 
   renderPage() {
@@ -654,6 +656,8 @@ class App extends Component {
           <Route exact path="/login" render={(props) => this.renderHomeIfLoggedIn(<SelfLoginPage account={this.state.account} {...props} />)}/>
           <Route exact path="/signup/oauth/authorize" render={(props) => <LoginPage account={this.state.account} type={"code"} mode={"signup"} {...props} onUpdateAccount={(account) => {this.onUpdateAccount(account)}} />}/>
           <Route exact path="/login/oauth/authorize" render={(props) => <LoginPage account={this.state.account} type={"code"} mode={"signin"} {...props} onUpdateAccount={(account) => {this.onUpdateAccount(account)}} />}/>
+          <Route exact path="/cas/:owner/:casApplicationName/logout" render={(props) => this.renderHomeIfLoggedIn(<CasLogout clearAccount={() => this.setState({account: null})} {...props} />)} />
+          <Route exact path="/cas/:owner/:casApplicationName/login" render={(props) => {return (<LoginPage type={"cas"} mode={"signup"} account={this.state.account} {...props} />)}} />
           <Route exact path="/callback" component={AuthCallback}/>
           <Route exact path="/callback/saml" component={SamlCallback}/>
           <Route exact path="/forget" render={(props) => this.renderHomeIfLoggedIn(<SelfForgetPage {...props} />)}/>

web/src/auth/AuthBackend.js

@@ -62,6 +62,14 @@ export function login(values, oAuthParams) {
   }).then(res => res.json());
 }
 
+export function loginCas(values, params) {
+  return fetch(`${authConfig.serverUrl}/api/login?service=${params.service}`, {
+    method: 'POST',
+    credentials: "include",
+    body: JSON.stringify(values),
+  }).then(res => res.json());
+}
+
 export function logout() {
   return fetch(`${authConfig.serverUrl}/api/logout`, {
     method: 'POST',

web/src/auth/CasLogout.js

@@ -0,0 +1,68 @@
+// Copyright 2022 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.
+
+import React from "react";
+import {Spin} from "antd";
+import {withRouter} from "react-router-dom";
+import * as AuthBackend from "./AuthBackend";
+import * as Setting from "../Setting";
+import i18next from "i18next";
+
+class CasLogout extends React.Component {
+  constructor(props) {
+    super(props);
+    this.state = {
+      classes: props,
+      msg: null,
+    };
+    if (props.match?.params.casApplicationName !== undefined) {
+      this.state.owner = props.match?.params.owner
+      this.state.applicationName = props.match?.params.casApplicationName
+    }
+  }
+
+  UNSAFE_componentWillMount() {
+    const params = new URLSearchParams(this.props.location.search);
+
+    AuthBackend.logout()
+      .then((res) => {
+        if (res.status === 'ok') {
+          Setting.showMessage("success", `Logged out successfully`);
+          this.props.clearAccount()
+          let redirectUri = res.data2;
+          if (redirectUri !== null && redirectUri !== undefined && redirectUri !== "") {
+            Setting.goToLink(redirectUri);
+          } else if (params.has("service")) {
+            Setting.goToLink(params.get("service"))
+          } else {
+            Setting.goToLinkSoft(this, `/cas/${this.state.owner}/${this.state.applicationName}/login`);
+          }
+        } else {
+          Setting.showMessage("error", `Failed to log out: ${res.msg}`);
+        }
+      });
+
+  }
+
+  render() {
+    return (
+      <div style={{textAlign: "center"}}>
+        {
+          <Spin size="large" tip={i18next.t("login:Logging out...")} style={{paddingTop: "10%"}} />
+        }
+      </div>
+    )
+  }
+}
+export default withRouter(CasLogout);

web/src/auth/LoginPage.js

@@ -61,11 +61,16 @@ class LoginPage extends React.Component {
       validEmailOrPhone: false,
       validEmail: false,
       validPhone: false,
+      owner: null,
     };
+    if (this.state.type === "cas" && props.match?.params.casApplicationName !== undefined) {
+      this.state.owner = props.match?.params.owner
+      this.state.applicationName = props.match?.params.casApplicationName
+    }
   }
 
   UNSAFE_componentWillMount() {
-    if (this.state.type === "login") {
+    if (this.state.type === "login" || this.state.type === "cas") {
       this.getApplication();
     } else if (this.state.type === "code") {
       this.getApplicationLogin();
@@ -120,6 +125,31 @@ class LoginPage extends React.Component {
   onFinish(values) {
     const application = this.getApplicationObj();
     const ths = this;
+
+    //here we are supposed to judge whether casdoor is working as a oauth server or CAS server
+    if (this.state.type === "cas") {
+      //cas
+      const casParams = Util.getCasParameters()
+      values["type"] = this.state.type;
+      AuthBackend.loginCas(values, casParams).then((res) => {
+        if (res.status === 'ok') {
+          let msg = "Logged in successfully. "
+          if (casParams.service == "") {
+            //If service was not specified, CAS MUST display a message notifying the client that it has successfully initiated a single sign-on session.
+            msg += "Now you can visit apps protected by casdoor."
+          }
+          Util.showMessage("success", msg);
+          if (casParams.service !== "") {
+            let st = res.data
+            window.location.href = casParams.service + "?ticket=" + st
+          }
+
+        } else {
+          Util.showMessage("error", `Failed to log in: ${res.msg}`);
+        }
+      })
+    } else {
+      //oauth
       const oAuthParams = Util.getOAuthGetParameters();
       if (oAuthParams !== null && oAuthParams.responseType != null && oAuthParams.responseType !== "") {
         values["type"] = oAuthParams.responseType
@@ -173,6 +203,7 @@ class LoginPage extends React.Component {
             Util.showMessage("error", `Failed to log in: ${res.msg}`);
           }
         });
+      }
   };
 
   getSigninButton(type) {

web/src/auth/Util.js

@@ -79,6 +79,18 @@ function getRefinedValue(value){
   return (value === null)? "" : value
 }
 
+export function getCasParameters(params){
+  const queries = (params !== undefined) ? params : new URLSearchParams(window.location.search);
+  const service = getRefinedValue(queries.get("service"))
+  const renew = getRefinedValue(queries.get("renew"))
+  const gateway = getRefinedValue(queries.get("gateway"))
+  return {
+    service: service,
+    renew: renew,
+    gateway: gateway,
+  }
+}
+
 export function getOAuthGetParameters(params) {
   const queries = (params !== undefined) ? params : new URLSearchParams(window.location.search);
   const clientId = getRefinedValue(queries.get("client_id"));