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

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.Data = st
+			}
+		}
+		if application.EnableSigninSession || application.HasPromptPage() {
+			// The prompt page needs the user to be signed in
+			c.SetSessionUsername(userId)
+		}
+
 	} else {
-		resp = &Response{Status: "error", Msg: fmt.Sprintf("Unknown response type: %s", form.Type)}
+		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()
+	}
+}