Added ADFS Provider

CHANGELOG.md

@@ -7,6 +7,7 @@
 ## Breaking Changes
 
 ## Changes since v7.1.3
+- [#1238](https://github.com/oauth2-proxy/oauth2-proxy/pull/1238) Added ADFS provider (@samirachoadi)
 - [#1227](https://github.com/oauth2-proxy/oauth2-proxy/pull/1227) Fix Refresh Session not working for multiple cookies (@rishi1111)
 - [#1063](https://github.com/oauth2-proxy/oauth2-proxy/pull/1063) Add Redis lock feature to lock persistent sessions (@Bibob7)
 - [#1108](https://github.com/oauth2-proxy/oauth2-proxy/pull/1108) Add alternative ways to generate cookie secrets to docs (@JoelSpeed)

docs/docs/configuration/alpha_config.md

@@ -101,6 +101,16 @@ You must remove these options before starting OAuth2 Proxy with `--alpha-config`
 ## Configuration Reference
 <!--- THIS FILE IS AUTOGENERATED!!! DO NOT EDIT!!! -->
 
+### ADFSOptions
+
+(**Appears on:** [Provider](#provider))
+
+
+
+| Field | Type | Description |
+| ----- | ---- | ----------- |
+| `skipScope` | _bool_ | Skip adding the scope parameter in login request<br/>Default value is 'false' |
+
 ### AlphaOptions
 
 AlphaOptions contains alpha structured configuration options.
@@ -284,6 +294,7 @@ Provider holds all configuration for a single provider
 | `clientSecretFile` | _string_ | ClientSecretFile is the name of the file<br/>containing the OAuth Client Secret, it will be used if ClientSecret is not set. |
 | `keycloakConfig` | _[KeycloakOptions](#keycloakoptions)_ | KeycloakConfig holds all configurations for Keycloak provider. |
 | `azureConfig` | _[AzureOptions](#azureoptions)_ | AzureConfig holds all configurations for Azure provider. |
+| `ADFSConfig` | _[ADFSOptions](#adfsoptions)_ | ADFSConfig holds all configurations for ADFS provider. |
 | `bitbucketConfig` | _[BitbucketOptions](#bitbucketoptions)_ | BitbucketConfig holds all configurations for Bitbucket provider. |
 | `githubConfig` | _[GitHubOptions](#githuboptions)_ | GitHubConfig holds all configurations for GitHubC provider. |
 | `gitlabConfig` | _[GitLabOptions](#gitlaboptions)_ | GitLabConfig holds all configurations for GitLab provider. |
@@ -297,7 +308,7 @@ Provider holds all configuration for a single provider
 | `loginURL` | _string_ | LoginURL is the authentication endpoint |
 | `redeemURL` | _string_ | RedeemURL is the token redemption endpoint |
 | `profileURL` | _string_ | ProfileURL is the profile access endpoint |
-| `resource` | _string_ | ProtectedResource is the resource that is protected (Azure AD only) |
+| `resource` | _string_ | ProtectedResource is the resource that is protected (Azure AD and ADFS only) |
 | `validateURL` | _string_ | ValidateURL is the access token validation endpoint |
 | `scope` | _string_ | Scope is the OAuth scope specification |
 | `prompt` | _string_ | Prompt is OIDC prompt |

docs/docs/configuration/auth.md

@@ -9,6 +9,7 @@ Valid providers are :
 
 - [Google](#google-auth-provider) _default_
 - [Azure](#azure-auth-provider)
+- [ADFS](#adfs-auth-provider)
 - [Facebook](#facebook-auth-provider)
 - [GitHub](#github-auth-provider)
 - [Keycloak](#keycloak-auth-provider)
@@ -88,6 +89,21 @@ Note: The user is checked against the group members list on initial authenticati
 
 Note: When using the Azure Auth provider with nginx and the cookie session store you may find the cookie is too large and doesn't get passed through correctly. Increasing the proxy_buffer_size in nginx or implementing the [redis session storage](sessions.md#redis-storage) should resolve this.
 
+### ADFS Auth Provider
+
+1. Open the ADFS administration console on your Windows Server and add a new Application Group
+2. Provide a name for the integration, select Server Application from the Standalone applications section and click Next
+3. Follow the wizard to get the client-id, client-secret and configure the application credentials
+4. Configure the proxy with
+
+```
+   --provider=adfs
+   --client-id=<application ID from step 3>
+   --client-secret=<value from step 3>
+```
+
+Note: When using the ADFS Auth provider with nginx and the cookie session store you may find the cookie is too large and doesn't get passed through correctly. Increasing the proxy_buffer_size in nginx or implementing the [redis session storage](sessions.md#redis-storage) should resolve this.
+
 ### Facebook Auth Provider
 
 1.  Create a new FB App from <https://developers.facebook.com/>

pkg/apis/options/providers.go

@@ -21,6 +21,8 @@ type Provider struct {
 	KeycloakConfig KeycloakOptions `json:"keycloakConfig,omitempty"`
 	// AzureConfig holds all configurations for Azure provider.
 	AzureConfig AzureOptions `json:"azureConfig,omitempty"`
+	// ADFSConfig holds all configurations for ADFS provider.
+	ADFSConfig ADFSOptions `json:"ADFSConfig,omitempty"`
 	// BitbucketConfig holds all configurations for Bitbucket provider.
 	BitbucketConfig BitbucketOptions `json:"bitbucketConfig,omitempty"`
 	// GitHubConfig holds all configurations for GitHubC provider.
@@ -55,7 +57,7 @@ type Provider struct {
 	RedeemURL string `json:"redeemURL,omitempty"`
 	// ProfileURL is the profile access endpoint
 	ProfileURL string `json:"profileURL,omitempty"`
-	// ProtectedResource is the resource that is protected (Azure AD only)
+	// ProtectedResource is the resource that is protected (Azure AD and ADFS only)
 	ProtectedResource string `json:"resource,omitempty"`
 	// ValidateURL is the access token validation endpoint
 	ValidateURL string `json:"validateURL,omitempty"`
@@ -84,6 +86,12 @@ type AzureOptions struct {
 	Tenant string `json:"tenant,omitempty"`
 }
 
+type ADFSOptions struct {
+	// Skip adding the scope parameter in login request
+	// Default value is 'false'
+	SkipScope bool `json:"skipScope,omitempty"`
+}
+
 type BitbucketOptions struct {
 	// Team sets restrict logins to members of this team
 	Team string `json:"team,omitempty"`

pkg/validation/options.go

@@ -236,6 +236,8 @@ func parseProviderInfo(o *options.Options, msgs []string) []string {
 	switch p := o.GetProvider().(type) {
 	case *providers.AzureProvider:
 		p.Configure(o.Providers[0].AzureConfig.Tenant)
+	case *providers.ADFSProvider:
+		p.Configure(o.Providers[0].ADFSConfig.SkipScope)
 	case *providers.GitHubProvider:
 		p.SetOrgTeam(o.Providers[0].GitHubConfig.Org, o.Providers[0].GitHubConfig.Team)
 		p.SetRepo(o.Providers[0].GitHubConfig.Repo, o.Providers[0].GitHubConfig.Token)

providers/adfs.go

@@ -0,0 +1,100 @@
+package providers
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"net/url"
+	"strings"
+
+	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/sessions"
+)
+
+// ADFSProvider represents an ADFS based Identity Provider
+type ADFSProvider struct {
+	*OIDCProvider
+	SkipScope bool
+}
+
+var _ Provider = (*ADFSProvider)(nil)
+
+const (
+	ADFSProviderName = "ADFS"
+	ADFSDefaultScope = "openid email profile"
+	ADFSSkipScope    = false
+)
+
+// NewADFSProvider initiates a new ADFSProvider
+func NewADFSProvider(p *ProviderData) *ADFSProvider {
+
+	p.setProviderDefaults(providerDefaults{
+		name:  ADFSProviderName,
+		scope: ADFSDefaultScope,
+	})
+
+	if p.ProtectedResource != nil && p.ProtectedResource.String() != "" {
+		resource := p.ProtectedResource.String()
+		if !strings.HasSuffix(resource, "/") {
+			resource += "/"
+		}
+
+		if p.Scope != "" && !strings.HasPrefix(p.Scope, resource) {
+			p.Scope = resource + p.Scope
+		}
+	}
+
+	return &ADFSProvider{
+		OIDCProvider: &OIDCProvider{
+			ProviderData: p,
+			SkipNonce:    true,
+		},
+		SkipScope: ADFSSkipScope,
+	}
+}
+
+// Configure defaults the ADFSProvider configuration options
+func (p *ADFSProvider) Configure(skipScope bool) {
+	p.SkipScope = skipScope
+}
+
+// GetLoginURL Override to double encode the state parameter. If not query params are lost
+// More info here: https://docs.microsoft.com/en-us/powerapps/maker/portals/configure/configure-saml2-settings
+func (p *ADFSProvider) GetLoginURL(redirectURI, state, nonce string) string {
+	extraParams := url.Values{}
+	if !p.SkipNonce {
+		extraParams.Add("nonce", nonce)
+	}
+	loginURL := makeLoginURL(p.Data(), redirectURI, url.QueryEscape(state), extraParams)
+	if p.SkipScope {
+		q := loginURL.Query()
+		q.Del("scope")
+		loginURL.RawQuery = q.Encode()
+	}
+	return loginURL.String()
+}
+
+// EnrichSession to add email
+func (p *ADFSProvider) EnrichSession(ctx context.Context, s *sessions.SessionState) error {
+	if s.Email != "" {
+		return nil
+	}
+
+	idToken, err := p.Verifier.Verify(ctx, s.IDToken)
+	if err != nil {
+		return err
+	}
+
+	p.EmailClaim = "upn"
+	c, err := p.getClaims(idToken)
+
+	if err != nil {
+		return fmt.Errorf("couldn't extract claims from id_token (%v)", err)
+	}
+	s.Email = c.Email
+
+	if s.Email == "" {
+		err = errors.New("email not set")
+	}
+
+	return err
+}

providers/adfs_test.go

@@ -0,0 +1,205 @@
+package providers
+
+import (
+	"context"
+	"encoding/base64"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"strings"
+
+	"github.com/coreos/go-oidc"
+	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/sessions"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/ginkgo/extensions/table"
+	. "github.com/onsi/gomega"
+)
+
+type fakeADFSJwks struct{}
+
+func (fakeADFSJwks) VerifySignature(_ context.Context, jwt string) (payload []byte, err error) {
+	decodeString, err := base64.RawURLEncoding.DecodeString(strings.Split(jwt, ".")[1])
+	if err != nil {
+		return nil, err
+	}
+	return decodeString, nil
+}
+
+func testADFSProvider(hostname string) *ADFSProvider {
+
+	o := oidc.NewVerifier(
+		"https://issuer.example.com",
+		fakeADFSJwks{},
+		&oidc.Config{ClientID: "https://test.myapp.com"},
+	)
+
+	p := NewADFSProvider(&ProviderData{
+		ProviderName: "",
+		LoginURL:     &url.URL{},
+		RedeemURL:    &url.URL{},
+		ProfileURL:   &url.URL{},
+		ValidateURL:  &url.URL{},
+		Scope:        "",
+		Verifier:     o,
+	})
+
+	if hostname != "" {
+		updateURL(p.Data().LoginURL, hostname)
+		updateURL(p.Data().RedeemURL, hostname)
+		updateURL(p.Data().ProfileURL, hostname)
+		updateURL(p.Data().ValidateURL, hostname)
+	}
+
+	return p
+}
+
+func testADFSBackend() *httptest.Server {
+
+	authResponse := `
+		{
+			"access_token": "my_access_token",
+			"id_token": "my_id_token",
+			"refresh_token": "my_refresh_token" 
+		 }
+	`
+	userInfo := `
+		{
+			"email": "samiracho@email.com"
+		}
+	`
+
+	refreshResponse := `{ "access_token": "new_some_access_token", "refresh_token": "new_some_refresh_token", "expires_in": "32693148245", "id_token": "new_some_id_token" }`
+
+	authHeader := "Bearer adfs_access_token"
+
+	return httptest.NewServer(http.HandlerFunc(
+		func(w http.ResponseWriter, r *http.Request) {
+			switch r.URL.Path {
+			case "/adfs/oauth2/authorize":
+				w.WriteHeader(200)
+				w.Write([]byte(authResponse))
+			case "/adfs/oauth2/refresh":
+				w.WriteHeader(200)
+				w.Write([]byte(refreshResponse))
+			case "/adfs/oauth2/userinfo":
+				if r.Header["Authorization"][0] == authHeader {
+					w.WriteHeader(200)
+					w.Write([]byte(userInfo))
+				} else {
+					w.WriteHeader(401)
+				}
+			default:
+				w.WriteHeader(200)
+			}
+		}))
+}
+
+var _ = Describe("ADFS Provider Tests", func() {
+	var p *ADFSProvider
+	var b *httptest.Server
+
+	BeforeEach(func() {
+		b = testADFSBackend()
+
+		bURL, err := url.Parse(b.URL)
+		Expect(err).To(BeNil())
+
+		p = testADFSProvider(bURL.Host)
+	})
+
+	AfterEach(func() {
+		b.Close()
+	})
+
+	Context("New Provider Init", func() {
+		It("uses defaults", func() {
+			providerData := NewADFSProvider(&ProviderData{}).Data()
+			Expect(providerData.ProviderName).To(Equal("ADFS"))
+			Expect(providerData.Scope).To(Equal("openid email profile"))
+		})
+	})
+
+	Context("with bad token", func() {
+		It("should trigger an error", func() {
+			session := &sessions.SessionState{AccessToken: "unexpected_adfs_access_token", IDToken: "malformed_token"}
+			err := p.EnrichSession(context.Background(), session)
+			Expect(err).NotTo(BeNil())
+		})
+	})
+
+	Context("with valid token", func() {
+		It("should not throw an error", func() {
+			p.EmailClaim = "email"
+			rawIDToken, _ := newSignedTestIDToken(defaultIDToken)
+			idToken, err := p.Verifier.Verify(context.Background(), rawIDToken)
+			Expect(err).To(BeNil())
+			session, err := p.buildSessionFromClaims(idToken)
+			session.IDToken = rawIDToken
+			Expect(err).To(BeNil())
+			err = p.EnrichSession(context.Background(), session)
+			Expect(session.Email).To(Equal("janed@me.com"))
+			Expect(err).To(BeNil())
+		})
+	})
+
+	Context("with skipScope enabled", func() {
+		It("should not include parameter scope", func() {
+			resource, _ := url.Parse("http://example.com")
+			p := NewADFSProvider(&ProviderData{
+				ProtectedResource: resource,
+				Scope:             "",
+			})
+			p.SkipScope = true
+
+			result := p.GetLoginURL("https://example.com/adfs/oauth2/", "", "")
+			Expect(result).NotTo(ContainSubstring("scope="))
+		})
+	})
+
+	Context("With resource parameter", func() {
+		type scopeTableInput struct {
+			resource      string
+			scope         string
+			expectedScope string
+		}
+
+		DescribeTable("should return expected results",
+			func(in scopeTableInput) {
+				resource, _ := url.Parse(in.resource)
+				p := NewADFSProvider(&ProviderData{
+					ProtectedResource: resource,
+					Scope:             in.scope,
+				})
+
+				Expect(p.Data().Scope).To(Equal(in.expectedScope))
+				result := p.GetLoginURL("https://example.com/adfs/oauth2/", "", "")
+				Expect(result).To(ContainSubstring("scope=" + url.QueryEscape(in.expectedScope)))
+			},
+			Entry("should add slash", scopeTableInput{
+				resource:      "http://resource.com",
+				scope:         "openid",
+				expectedScope: "http://resource.com/openid",
+			}),
+			Entry("shouldn't add extra slash", scopeTableInput{
+				resource:      "http://resource.com/",
+				scope:         "openid",
+				expectedScope: "http://resource.com/openid",
+			}),
+			Entry("should add default scopes with resource", scopeTableInput{
+				resource:      "http://resource.com/",
+				scope:         "",
+				expectedScope: "http://resource.com/openid email profile",
+			}),
+			Entry("should add default scopes", scopeTableInput{
+				resource:      "",
+				scope:         "",
+				expectedScope: "openid email profile",
+			}),
+			Entry("shouldn't add resource if already in scopes", scopeTableInput{
+				resource:      "http://resource.com",
+				scope:         "http://resource.com/openid",
+				expectedScope: "http://resource.com/openid",
+			}),
+		)
+	})
+})

providers/providers.go

@@ -33,6 +33,8 @@ func New(provider string, p *ProviderData) Provider {
 		return NewKeycloakProvider(p)
 	case "azure":
 		return NewAzureProvider(p)
+	case "adfs":
+		return NewADFSProvider(p)
 	case "gitlab":
 		return NewGitLabProvider(p)
 	case "oidc":