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connector: add a SAML connector

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This commit is contained in:
Eric Chiang 2016-12-20 17:24:17 -08:00
parent ec9d1607b2
commit 31dfb54b6f
7 changed files with 683 additions and 0 deletions
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17
connector/connector.go
View File

@ -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

387
connector/saml/saml.go Normal file
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@ -0,0 +1,387 @@
// Package saml contains login methods for SAML.
package saml
import (
"bytes"
"compress/flate"
"crypto/rand"
"crypto/x509"
"encoding/base64"
"encoding/hex"
"encoding/pem"
"encoding/xml"
"errors"
"fmt"
"io/ioutil"
"strings"
"time"
"github.com/Sirupsen/logrus"
"github.com/beevik/etree"
dsig "github.com/russellhaering/goxmldsig"
"github.com/coreos/dex/connector"
)
const (
bindingRedirect = "urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect"
bindingPOST = "urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST"
nameIDFormatEmailAddress = "urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress"
nameIDFormatUnspecified = "urn:oasis:names:tc:SAML:1.1:nameid-format:unspecified"
nameIDFormatX509Subject = "urn:oasis:names:tc:SAML:1.1:nameid-format:X509SubjectName"
nameIDFormatWindowsDN = "urn:oasis:names:tc:SAML:1.1:nameid-format:WindowsDomainQualifiedName"
nameIDFormatEncrypted = "urn:oasis:names:tc:SAML:2.0:nameid-format:encrypted"
nameIDFormatEntity = "urn:oasis:names:tc:SAML:2.0:nameid-format:entity"
nameIDFormatKerberos = "urn:oasis:names:tc:SAML:2.0:nameid-format:kerberos"
nameIDFormatPersistent = "urn:oasis:names:tc:SAML:2.0:nameid-format:persistent"
nameIDformatTransient = "urn:oasis:names:tc:SAML:2.0:nameid-format:transient"
)
var (
nameIDFormats = []string{
nameIDFormatEmailAddress,
nameIDFormatUnspecified,
nameIDFormatX509Subject,
nameIDFormatWindowsDN,
nameIDFormatEncrypted,
nameIDFormatEntity,
nameIDFormatKerberos,
nameIDFormatPersistent,
nameIDformatTransient,
}
nameIDFormatLookup = make(map[string]string)
)
func init() {
suffix := func(s, sep string) string {
if i := strings.LastIndex(s, sep); i > 0 {
return s[i+1:]
}
return s
}
for _, format := range nameIDFormats {
nameIDFormatLookup[suffix(format, ":")] = format
nameIDFormatLookup[format] = format
}
}
// Config represents configuration options for the SAML provider.
type Config struct {
// TODO(ericchiang): A bunch of these fields could be auto-filled if
// we supported SAML metadata discovery.
//
// https://www.oasis-open.org/committees/download.php/35391/sstc-saml-metadata-errata-2.0-wd-04-diff.pdf
Issuer string `json:"issuer"`
SSOURL string `json:"ssoURL"`
// X509 CA file or raw data to verify XML signatures.
CA string `json:"ca"`
CAData []byte `json:"caData"`
InsecureSkipSignatureValidation bool `json:"insecureSkipSignatureValidation"`
// Assertion attribute names to lookup various claims with.
UsernameAttr string `json:"usernameAttr"`
EmailAttr string `json:"emailAttr"`
GroupsAttr string `json:"groupsAttr"`
// If GroupsDelim is supplied the connector assumes groups are returned as a
// single string instead of multiple attribute values. This delimiter will be
// used split the groups string.
GroupsDelim string `json:"groupsDelim"`
RedirectURI string `json:"redirectURI"`
// Requested format of the NameID. The NameID value is is mapped to the ID Token
// 'sub' claim.
//
// This can be an abbreviated form of the full URI with just the last component. For
// example, if this value is set to "emailAddress" the format will resolve to:
//
// urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress
//
// If no value is specified, this value defaults to:
//
// urn:oasis:names:tc:SAML:2.0:nameid-format:persistent
//
NameIDPolicyFormat string `json:"nameIDPolicyFormat"`
}
type certStore struct {
certs []*x509.Certificate
}
func (c certStore) Certificates() (roots []*x509.Certificate, err error) {
return c.certs, nil
}
// Open validates the config and returns a connector. It does not actually
// validate connectivity with the provider.
func (c *Config) Open(logger logrus.FieldLogger) (connector.Connector, error) {
return c.openConnector(logger)
}
func (c *Config) openConnector(logger logrus.FieldLogger) (interface {
connector.SAMLConnector
}, error) {
requiredFields := []struct {
name, val string
}{
{"issuer", c.Issuer},
{"ssoURL", c.SSOURL},
{"usernameAttr", c.UsernameAttr},
{"emailAttr", c.EmailAttr},
{"redirectURI", c.RedirectURI},
}
var missing []string
for _, f := range requiredFields {
if f.val == "" {
missing = append(missing, f.name)
}
}
switch len(missing) {
case 0:
case 1:
return nil, fmt.Errorf("missing required field %q", missing[0])
default:
return nil, fmt.Errorf("missing required fields %q", missing)
}
p := &provider{
issuer: c.Issuer,
ssoURL: c.SSOURL,
now: time.Now,
usernameAttr: c.UsernameAttr,
emailAttr: c.EmailAttr,
groupsAttr: c.GroupsAttr,
groupsDelim: c.GroupsDelim,
redirectURI: c.RedirectURI,
logger: logger,
nameIDPolicyFormat: c.NameIDPolicyFormat,
}
if p.nameIDPolicyFormat == "" {
p.nameIDPolicyFormat = nameIDFormatPersistent
} else {
if format, ok := nameIDFormatLookup[p.nameIDPolicyFormat]; ok {
p.nameIDPolicyFormat = format
} else {
return nil, fmt.Errorf("invalid nameIDPolicyFormat: %q", p.nameIDPolicyFormat)
}
}
if !c.InsecureSkipSignatureValidation {
if (c.CA == "") == (c.CAData == nil) {
return nil, errors.New("must provide either 'ca' or 'caData'")
}
var caData []byte
if c.CA != "" {
data, err := ioutil.ReadFile(c.CA)
if err != nil {
return nil, fmt.Errorf("read ca file: %v", err)
}
caData = data
} else {
caData = c.CAData
}
var (
certs []*x509.Certificate
block *pem.Block
)
for {
block, caData = pem.Decode(caData)
if block == nil {
break
}
cert, err := x509.ParseCertificate(block.Bytes)
if err != nil {
return nil, fmt.Errorf("parse cert: %v", err)
}
certs = append(certs, cert)
}
if len(certs) == 0 {
return nil, errors.New("no certificates found in ca data")
}
p.validator = dsig.NewDefaultValidationContext(certStore{certs})
}
return p, nil
}
type provider struct {
issuer string
ssoURL string
now func() time.Time
// If nil, don't do signature validation.
validator *dsig.ValidationContext
// Attribute mappings
usernameAttr string
emailAttr string
groupsAttr string
groupsDelim string
redirectURI string
nameIDPolicyFormat string
logger logrus.FieldLogger
}
func (p *provider) POSTData(s connector.Scopes) (action, value string, err error) {
// NOTE(ericchiang): If we can't follow up with the identity provider, can we
// support refresh tokens?
if s.OfflineAccess {
return "", "", fmt.Errorf("SAML does not support offline access")
}
r := &authnRequest{
ProtocolBinding: bindingPOST,
ID: "_" + uuidv4(),
IssueInstant: xmlTime(p.now()),
Destination: p.ssoURL,
Issuer: &issuer{
Issuer: p.issuer,
},
NameIDPolicy: &nameIDPolicy{
AllowCreate: true,
Format: p.nameIDPolicyFormat,
},
}
data, err := xml.MarshalIndent(r, "", " ")
if err != nil {
return "", "", fmt.Errorf("marshal authn request: %v", err)
}
buff := new(bytes.Buffer)
fw, err := flate.NewWriter(buff, flate.DefaultCompression)
if err != nil {
return "", "", fmt.Errorf("new flate writer: %v", err)
}
if _, err := fw.Write(data); err != nil {
return "", "", fmt.Errorf("compress message: %v", err)
}
if err := fw.Close(); err != nil {
return "", "", fmt.Errorf("flush message: %v", err)
}
return p.ssoURL, base64.StdEncoding.EncodeToString(buff.Bytes()), nil
}
func (p *provider) HandlePOST(s connector.Scopes, samlResponse string) (ident connector.Identity, err error) {
rawResp, err := base64.StdEncoding.DecodeString(samlResponse)
if err != nil {
return ident, fmt.Errorf("decode response: %v", err)
}
if p.validator != nil {
if rawResp, err = verify(p.validator, rawResp); err != nil {
return ident, fmt.Errorf("verify signature: %v", err)
}
}
var resp response
if err := xml.Unmarshal(rawResp, &resp); err != nil {
return ident, fmt.Errorf("unmarshal response: %v", err)
}
if resp.Destination != "" && resp.Destination != p.redirectURI {
return ident, fmt.Errorf("expected destination %q got %q", p.redirectURI, resp.Destination)
}
assertion := resp.Assertion
if assertion == nil {
return ident, fmt.Errorf("response did not contain an assertion")
}
subject := assertion.Subject
if subject == nil {
return ident, fmt.Errorf("response did not contain a subject")
}
switch {
case subject.NameID != nil:
if ident.UserID = subject.NameID.Value; ident.UserID == "" {
return ident, fmt.Errorf("NameID element does not contain a value")
}
default:
return ident, fmt.Errorf("subject does not contain an NameID element")
}
attributes := assertion.AttributeStatement
if attributes == nil {
return ident, fmt.Errorf("response did not contain a AttributeStatement")
}
if ident.Email, _ = attributes.get(p.emailAttr); ident.Email == "" {
return ident, fmt.Errorf("no attribute with name %q", p.emailAttr)
}
ident.EmailVerified = true
if ident.Username, _ = attributes.get(p.usernameAttr); ident.Username == "" {
return ident, fmt.Errorf("no attribute with name %q", p.usernameAttr)
}
if s.Groups && p.groupsAttr != "" {
if p.groupsDelim != "" {
groupsStr, ok := attributes.get(p.groupsAttr)
if !ok {
return ident, fmt.Errorf("no attribute with name %q", p.groupsAttr)
}
// TOOD(ericchiang): Do we need to further trim whitespace?
ident.Groups = strings.Split(groupsStr, p.groupsDelim)
} else {
groups, ok := attributes.all(p.groupsAttr)
if !ok {
return ident, fmt.Errorf("no attribute with name %q", p.groupsAttr)
}
ident.Groups = groups
}
}
return ident, nil
}
// verify checks the signature info of a XML document and returns
// the signed elements.
func verify(validator *dsig.ValidationContext, data []byte) (signed []byte, err error) {
doc := etree.NewDocument()
if err := doc.ReadFromBytes(data); err != nil {
return nil, fmt.Errorf("parse document: %v", err)
}
result, err := validator.Validate(doc.Root())
if err != nil {
return nil, err
}
doc.SetRoot(result)
return doc.WriteToBytes()
}
func uuidv4() string {
u := make([]byte, 16)
if _, err := rand.Read(u); err != nil {
panic(err)
}
u[6] = (u[6] | 0x40) & 0x4F
u[8] = (u[8] | 0x80) & 0xBF
r := make([]byte, 36)
r[8] = '-'
r[13] = '-'
r[18] = '-'
r[23] = '-'
hex.Encode(r, u[0:4])
hex.Encode(r[9:], u[4:6])
hex.Encode(r[14:], u[6:8])
hex.Encode(r[19:], u[8:10])
hex.Encode(r[24:], u[10:])
return string(r)
}

42
connector/saml/saml_test.go Normal file
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@ -0,0 +1,42 @@
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)
}
}

19
connector/saml/testdata/okta-ca.pem vendored Normal file
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@ -0,0 +1,19 @@
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

33
connector/saml/testdata/okta-resp.xml vendored Normal file
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@ -0,0 +1,33 @@
<?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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</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
A1UECAwKQ2FsaWZvcm5pYTEWMBQGA1UEBwwNU2FuIEZyYW5jaXNjbzENMAsGA1UECgwET2t0YTEU
MBIGA1UECwwLU1NPUHJvdmlkZXIxEzARBgNVBAMMCmRldi05NjkyNDQxHDAaBgkqhkiG9w0BCQEW
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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>

177
connector/saml/types.go Normal file
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@ -0,0 +1,177 @@
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"`
}

8
glide.yaml
View File

@ -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