connector: add a SAML connector

connector/connector.go

@@ -66,6 +66,23 @@ type CallbackConnector interface {
 	HandleCallback(s Scopes, r *http.Request) (identity Identity, err error)
 }
 
+// SAMLConnector represents SAML connectors which implement the HTTP POST binding.
+//
+// RelayState is handled by the server.
+type SAMLConnector interface {
+	// POSTData returns an encoded SAML request and SSO URL for the server to
+	// render a POST form with.
+	POSTData(s Scopes) (sooURL, samlRequest string, err error)
+
+	// TODO(ericchiang): Provide expected "InResponseTo" ID value.
+	//
+	// See: https://www.oasis-open.org/committees/download.php/35711/sstc-saml-core-errata-2.0-wd-06-diff.pdf
+	// "3.2.2 Complex Type StatusResponseType"
+
+	// HandlePOST decodes, verifies, and maps attributes from the SAML response.
+	HandlePOST(s Scopes, samlResponse string) (identity Identity, err error)
+}
+
 // RefreshConnector is a connector that can update the client claims.
 type RefreshConnector interface {
 	// Refresh is called when a client attempts to claim a refresh token. The

connector/saml/saml_test.go

+package saml
+
+import (
+	"crypto/x509"
+	"encoding/pem"
+	"errors"
+	"io/ioutil"
+	"testing"
+
+	sdig "github.com/russellhaering/goxmldsig"
+)
+
+func loadCert(ca string) (*x509.Certificate, error) {
+	data, err := ioutil.ReadFile(ca)
+	if err != nil {
+		return nil, err
+	}
+	block, _ := pem.Decode(data)
+	if block == nil {
+		return nil, errors.New("ca file didn't contain any PEM data")
+	}
+	return x509.ParseCertificate(block.Bytes)
+}
+
+func TestVerify(t *testing.T) {
+	cert, err := loadCert("testdata/okta-ca.pem")
+	if err != nil {
+		t.Fatal(err)
+	}
+	s := certStore{[]*x509.Certificate{cert}}
+
+	validator := sdig.NewDefaultValidationContext(s)
+
+	data, err := ioutil.ReadFile("testdata/okta-resp.xml")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if _, err := verify(validator, data); err != nil {
+		t.Fatal(err)
+	}
+}

connector/saml/testdata/okta-ca.pem

+-----BEGIN CERTIFICATE-----
+MIIDpDCCAoygAwIBAgIGAVjgvNroMA0GCSqGSIb3DQEBBQUAMIGSMQswCQYDVQQGEwJVUzETMBEG
+A1UECAwKQ2FsaWZvcm5pYTEWMBQGA1UEBwwNU2FuIEZyYW5jaXNjbzENMAsGA1UECgwET2t0YTEU
+MBIGA1UECwwLU1NPUHJvdmlkZXIxEzARBgNVBAMMCmRldi05NjkyNDQxHDAaBgkqhkiG9w0BCQEW
+DWluZm9Ab2t0YS5jb20wHhcNMTYxMjA4MjMxOTIzWhcNMjYxMjA4MjMyMDIzWjCBkjELMAkGA1UE
+BhMCVVMxEzARBgNVBAgMCkNhbGlmb3JuaWExFjAUBgNVBAcMDVNhbiBGcmFuY2lzY28xDTALBgNV
+BAoMBE9rdGExFDASBgNVBAsMC1NTT1Byb3ZpZGVyMRMwEQYDVQQDDApkZXYtOTY5MjQ0MRwwGgYJ
+KoZIhvcNAQkBFg1pbmZvQG9rdGEuY29tMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA
+4dW2YlcXjZwnTmLnV7IOBq8hhrdbqlNwdjCHRyx1BizOk3RbVP56grgPdyWScTCPpJ6vZZ8rtrY0
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+7Yk1j4GV/135zLOlsaonq8zfsu05VfY5XydNPFEkyIVcegLa8RiqALyFf+FjY/wVyhXtARw7NBUo
+u/Jh63cVya/VEoP1SVa0XQLf/ial+XuwdBBL1yc+7o2XHOfluDaXw/v2FWYpZtICf3a39giGaNWp
+eCT4g2TDWM4Jf/X7/mRbLX9tQO7XRural1CXx8VIMcmbKNbUtQiO8yEtVQ+FJKOsl7KOSzkgqNiL
+rJy+Y0D9biLZVKp07KWAY2FPCEtCkBrvo8BhvWbxWMA8CVQNAiTylM27Pc6kbc64pNr7C1Jx1wuE
+mVy9Fgb4PA2N3hPeD7mBmGGp7CfDbGcy
+-----END CERTIFICATE-----

connector/saml/testdata/okta-resp.xml

+<?xml version="1.0" encoding="UTF-8"?><saml2p:Response xmlns:saml2p="urn:oasis:names:tc:SAML:2.0:protocol" Destination="http://localhost:5556/dex/callback" ID="id108965453120986171998428970" InResponseTo="_fd1b3ef9-ec09-44a7-a66b-0d39c250f6a0" IssueInstant="2016-12-20T22:18:23.771Z" Version="2.0"><saml2:Issuer xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion" Format="urn:oasis:names:tc:SAML:2.0:nameid-format:entity">http://www.okta.com/exk91cb99lKkKSYoy0h7</saml2:Issuer><ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#"><ds:SignedInfo><ds:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/><ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256"/><ds:Reference URI="#id108965453120986171998428970"><ds:Transforms><ds:Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/><ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/></ds:Transforms><ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ds:DigestValue>Phu93l0D97JSMIYDZBdVeNLN0pwBVHhzUDWxbh4sc6g=</ds:DigestValue></ds:Reference></ds:SignedInfo><ds:SignatureValue>M2gMHOmnMAFgh2apq/2jHwDYmisUkYMUqxrWkQJf3RHFotl4EeDlcqq/FzOboJc3NcbKBqQY3CWsWhWh5cNWHDgNneaahW4czww+9DCM0R/zz5c6GuMYFEh5df2sDn/dWk/jbKMiAMgPdKJ2x/+5Xk9q4axC52TdQrrbZtzAAAn4CgrT6Kf11qfMl5wpDarg3qPw7ANxWn2DKzCsvCkOIwM2+AXh+sEXmTvvZIQ0vpv098FH/ZTGt4sCwb1bmRZ3UZLhBcxVc/sjuEW/sQ6pbQHkjrXIR5bxXzGNUxYpcGjrp9HGF+In0BAc+Ds/A0H142e1rgtcX8LH2pbG8URJSQ==</ds:SignatureValue><ds:KeyInfo><ds:X509Data><ds:X509Certificate>MIIDpDCCAoygAwIBAgIGAVjgvNroMA0GCSqGSIb3DQEBBQUAMIGSMQswCQYDVQQGEwJVUzETMBEG
+A1UECAwKQ2FsaWZvcm5pYTEWMBQGA1UEBwwNU2FuIEZyYW5jaXNjbzENMAsGA1UECgwET2t0YTEU
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+BAoMBE9rdGExFDASBgNVBAsMC1NTT1Byb3ZpZGVyMRMwEQYDVQQDDApkZXYtOTY5MjQ0MRwwGgYJ
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+mVy9Fgb4PA2N3hPeD7mBmGGp7CfDbGcy</ds:X509Certificate></ds:X509Data></ds:KeyInfo></ds:Signature><saml2p:Status xmlns:saml2p="urn:oasis:names:tc:SAML:2.0:protocol"><saml2p:StatusCode Value="urn:oasis:names:tc:SAML:2.0:status:Success"/></saml2p:Status><saml2:Assertion xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion" ID="id10896545312129779529177535" IssueInstant="2016-12-20T22:18:23.771Z" Version="2.0"><saml2:Issuer Format="urn:oasis:names:tc:SAML:2.0:nameid-format:entity" xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion">http://www.okta.com/exk91cb99lKkKSYoy0h7</saml2:Issuer><ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#"><ds:SignedInfo><ds:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/><ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256"/><ds:Reference URI="#id10896545312129779529177535"><ds:Transforms><ds:Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/><ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/></ds:Transforms><ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ds:DigestValue>ufwWUjecX6I/aQb4WW9P9ZMLG3C8hN6LaZyyb/EATIs=</ds:DigestValue></ds:Reference></ds:SignedInfo><ds:SignatureValue>jKtNBzxAL67ssuzWkkbf0yzqRyZ51y2JjBQ9C6bW8io/JOYQB2v7Bix7Eu/RjJslO7OBqD+3tPrK7ZBOy2+LFuAh3cDNa3U5NhO0raLrn/2YoJXfjj3XX3hyQv6GVxo0EY1KJNXOzWxjp9RVDpHslPTIL1yDC/oy0Mlzxu6pXBEerz9J2/Caenq66Skb5/DAT8FvrJ2s1bxuMagShs3APhC1hD8mvktZ+ZcN8ujs2SebteGK4IoOCx+e8+v2CyycBv1l5l+v5I+D2HnbAw4LfvHnW4rZOJT2AvoI47p1YBK1qDsJutG3jUPKy4Yx5YF73Xi1oytr+rrHyx/lfFPd2A==</ds:SignatureValue><ds:KeyInfo><ds:X509Data><ds:X509Certificate>MIIDpDCCAoygAwIBAgIGAVjgvNroMA0GCSqGSIb3DQEBBQUAMIGSMQswCQYDVQQGEwJVUzETMBEG
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+mVy9Fgb4PA2N3hPeD7mBmGGp7CfDbGcy</ds:X509Certificate></ds:X509Data></ds:KeyInfo></ds:Signature><saml2:Subject xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion"><saml2:NameID Format="urn:oasis:names:tc:SAML:1.1:nameid-format:unspecified">eric.chiang+okta@coreos.com</saml2:NameID><saml2:SubjectConfirmation Method="urn:oasis:names:tc:SAML:2.0:cm:bearer"><saml2:SubjectConfirmationData InResponseTo="_fd1b3ef9-ec09-44a7-a66b-0d39c250f6a0" NotOnOrAfter="2016-12-20T22:23:23.772Z" Recipient="http://localhost:5556/dex/callback"/></saml2:SubjectConfirmation></saml2:Subject><saml2:Conditions NotBefore="2016-12-20T22:13:23.772Z" NotOnOrAfter="2016-12-20T22:23:23.772Z" xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion"><saml2:AudienceRestriction><saml2:Audience>http://localhost:5556/dex/callback</saml2:Audience></saml2:AudienceRestriction></saml2:Conditions><saml2:AuthnStatement AuthnInstant="2016-12-20T22:18:23.771Z" SessionIndex="_fd1b3ef9-ec09-44a7-a66b-0d39c250f6a0" xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion"><saml2:AuthnContext><saml2:AuthnContextClassRef>urn:oasis:names:tc:SAML:2.0:ac:classes:PasswordProtectedTransport</saml2:AuthnContextClassRef></saml2:AuthnContext></saml2:AuthnStatement></saml2:Assertion></saml2p:Response>

connector/saml/types.go

+package saml
+
+import (
+	"encoding/xml"
+	"fmt"
+	"time"
+)
+
+const timeFormat = "2006-01-02T15:04:05Z"
+
+type xmlTime time.Time
+
+func (t xmlTime) MarshalXMLAttr(name xml.Name) (xml.Attr, error) {
+	return xml.Attr{
+		Name:  name,
+		Value: time.Time(t).UTC().Format(timeFormat),
+	}, nil
+}
+
+func (t *xmlTime) UnmarshalXMLAttr(attr xml.Attr) error {
+	got, err := time.Parse(timeFormat, attr.Value)
+	if err != nil {
+		return err
+	}
+	*t = xmlTime(got)
+	return nil
+}
+
+type samlVersion struct{}
+
+func (s samlVersion) MarshalXMLAttr(name xml.Name) (xml.Attr, error) {
+	return xml.Attr{
+		Name:  name,
+		Value: "2.0",
+	}, nil
+}
+
+func (s *samlVersion) UnmarshalXMLAttr(attr xml.Attr) error {
+	if attr.Value != "2.0" {
+		return fmt.Errorf(`saml version expected "2.0" got %q`, attr.Value)
+	}
+	return nil
+}
+
+type authnRequest struct {
+	XMLName xml.Name `xml:"urn:oasis:names:tc:SAML:2.0:protocol AuthnRequest"`
+
+	ID      string      `xml:"ID,attr"`
+	Version samlVersion `xml:"Version,attr"`
+
+	ProviderName string  `xml:"ProviderName,attr,omitempty"`
+	IssueInstant xmlTime `xml:"IssueInstant,attr,omitempty"`
+	Consent      bool    `xml:"Consent,attr,omitempty"`
+	Destination  string  `xml:"Destination,attr,omitempty"`
+
+	ForceAuthn      bool   `xml:"ForceAuthn,attr,omitempty"`
+	IsPassive       bool   `xml:"IsPassive,attr,omitempty"`
+	ProtocolBinding string `xml:"ProtocolBinding,attr,omitempty"`
+
+	Subject      *subject      `xml:"Subject,omitempty"`
+	Issuer       *issuer       `xml:"Issuer,omitempty"`
+	NameIDPolicy *nameIDPolicy `xml:"NameIDPolicy,omitempty"`
+
+	// TODO(ericchiang): Make this configurable and determine appropriate default values.
+	RequestAuthnContext *requestAuthnContext `xml:"RequestAuthnContext,omitempty"`
+}
+
+type subject struct {
+	XMLName xml.Name `xml:"urn:oasis:names:tc:SAML:2.0:assertion Subject"`
+
+	NameID *nameID `xml:"NameID,omitempty"`
+
+	// TODO(ericchiang): Do we need to deal with baseID?
+}
+
+type nameID struct {
+	XMLName xml.Name `xml:"urn:oasis:names:tc:SAML:2.0:assertion NameID"`
+
+	Format string `xml:"Format,omitempty"`
+	Value  string `xml:",chardata"`
+}
+
+type issuer struct {
+	XMLName xml.Name `xml:"urn:oasis:names:tc:SAML:2.0:assertion Issuer"`
+	Issuer  string   `xml:",chardata"`
+}
+
+type nameIDPolicy struct {
+	XMLName     xml.Name `xml:"urn:oasis:names:tc:SAML:2.0:protocol NameIDPolicy"`
+	AllowCreate bool     `xml:"AllowCreate,attr,omitempty"`
+	Format      string   `xml:"Format,attr,omitempty"`
+}
+
+type requestAuthnContext struct {
+	XMLName xml.Name `xml:"urn:oasis:names:tc:SAML:2.0:protocol RequestAuthnContext"`
+
+	AuthnContextClassRefs []authnContextClassRef
+}
+
+type authnContextClassRef struct {
+	XMLName xml.Name `xml:"urn:oasis:names:tc:SAML:2.0:protocol AuthnContextClassRef"`
+	Value   string   `xml:",chardata"`
+}
+
+type response struct {
+	XMLName xml.Name `xml:"urn:oasis:names:tc:SAML:2.0:protocol Response"`
+
+	ID      string      `xml:"ID,attr"`
+	Version samlVersion `xml:"Version,attr"`
+
+	Destination string `xml:"Destination,attr,omitempty"`
+
+	Issuer *issuer `xml:"Issuer,omitempty"`
+
+	// TODO(ericchiang): How do deal with multiple assertions?
+	Assertion *assertion `xml:"Assertion,omitempty"`
+}
+
+type assertion struct {
+	XMLName xml.Name `xml:"urn:oasis:names:tc:SAML:2.0:assertion Assertion"`
+
+	Version       samlVersion `xml:"Version,attr"`
+	ID            string      `xml:"ID,attr"`
+	IssueInstance xmlTime     `xml:"IssueInstance,attr"`
+
+	Issuer issuer `xml:"Issuer"`
+
+	Subject *subject `xml:"Subject,omitempty"`
+
+	AttributeStatement *attributeStatement `xml:"AttributeStatement,omitempty"`
+}
+
+type attributeStatement struct {
+	XMLName xml.Name `xml:"urn:oasis:names:tc:SAML:2.0:assertion AttributeStatement"`
+
+	Attributes []attribute `xml:"Attribute"`
+}
+
+func (a *attributeStatement) get(name string) (s string, ok bool) {
+	for _, attr := range a.Attributes {
+		if attr.Name == name {
+			ok = true
+			if len(attr.AttributeValues) > 0 {
+				return attr.AttributeValues[0].Value, true
+			}
+		}
+	}
+	return
+}
+
+func (a *attributeStatement) all(name string) (s []string, ok bool) {
+	for _, attr := range a.Attributes {
+		if attr.Name == name {
+			ok = true
+			for _, val := range attr.AttributeValues {
+				s = append(s, val.Value)
+			}
+		}
+	}
+	return
+}
+
+type attribute struct {
+	XMLName xml.Name `xml:"urn:oasis:names:tc:SAML:2.0:assertion Attribute"`
+
+	Name string `xml:"Name,attr"`
+
+	NameFormat   string `xml:"NameFormat,attr,omitempty"`
+	FriendlyName string `xml:"FriendlyName,attr,omitempty"`
+
+	AttributeValues []attributeValue `xml:"AttributeValue,omitempty"`
+}
+
+type attributeValue struct {
+	XMLName xml.Name `xml:"AttributeValue"`
+	Value   string   `xml:",chardata"`
+}

glide.yaml

@@ -131,3 +131,11 @@ import:
   version: v0.11.0
 - package: golang.org/x/sys/unix
   version: 833a04a10549a95dc34458c195cbad61bbb6cb4d
+
+# XML signature validation for SAML connector
+- package: github.com/russellhaering/goxmldsig
+  version: d9f653eb27ee8b145f7d5a45172e81a93def0860
+- package: github.com/beevik/etree
+  version: 4cd0dd976db869f817248477718071a28e978df0
+- package: github.com/jonboulle/clockwork
+  version: bcac9884e7502bb2b474c0339d889cb981a2f27f