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openidconnect.go
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openidconnect.go
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/*
An example of adding OpenID Connect support to osin.
*/
package main
import (
"crypto/x509"
"encoding/json"
"encoding/pem"
"fmt"
"log"
"net/http"
"strconv"
"strings"
"time"
"github.com/RangelReale/osin"
"github.com/RangelReale/osin/example"
"gopkg.in/square/go-jose.v1"
)
var (
issuer = "http://127.0.0.1:14001"
server = osin.NewServer(osin.NewServerConfig(), example.NewTestStorage())
jwtSigner jose.Signer
publicKeys *jose.JsonWebKeySet
)
func main() {
// Load signing key.
block, _ := pem.Decode(privateKeyBytes)
if block == nil {
log.Fatalf("no private key found")
}
key, err := x509.ParsePKCS1PrivateKey(block.Bytes)
if err != nil {
log.Fatalf("failed to parse key: %v", err)
}
// Configure jwtSigner and public keys.
privateKey := &jose.JsonWebKey{
Key: key,
Algorithm: "RS256",
Use: "sig",
KeyID: "1", // KeyID should use the key thumbprint.
}
jwtSigner, err = jose.NewSigner(jose.RS256, privateKey)
if err != nil {
log.Fatalf("failed to create jwtSigner: %v", err)
}
publicKeys = &jose.JsonWebKeySet{
Keys: []jose.JsonWebKey{
jose.JsonWebKey{Key: &key.PublicKey,
Algorithm: "RS256",
Use: "sig",
KeyID: "1",
},
},
}
// Register the four manditory OpenID Connect endpoints: discovery, public keys, auth, and token.
http.HandleFunc("/.well-known/openid-configuration", handleDiscovery)
http.HandleFunc("/publickeys", handlePublicKeys)
http.HandleFunc("/authorize", handleAuthorization)
http.HandleFunc("/token", handleToken)
log.Fatal(http.ListenAndServe("127.0.0.1:14001", nil))
}
// The ID Token represents a JWT passed to the client as part of the token response.
//
// https://openid.net/specs/openid-connect-core-1_0.html#IDToken
type IDToken struct {
Issuer string `json:"iss"`
UserID string `json:"sub"`
ClientID string `json:"aud"`
Expiration int64 `json:"exp"`
IssuedAt int64 `json:"iat"`
Nonce string `json:"nonce,omitempty"` // Non-manditory fields MUST be "omitempty"
// Custom claims supported by this server.
//
// See: https://openid.net/specs/openid-connect-core-1_0.html#StandardClaims
Email string `json:"email,omitempty"`
EmailVerified *bool `json:"email_verified,omitempty"`
Name string `json:"name,omitempty"`
FamilyName string `json:"family_name,omitempty"`
GivenName string `json:"given_name,omitempty"`
Locale string `json:"locale,omitempty"`
}
// handleDiscovery returns the OpenID Connect discovery object, allowing clients
// to discover OAuth2 resources.
func handleDiscovery(w http.ResponseWriter, r *http.Request) {
// For other example see: https://accounts.google.com/.well-known/openid-configuration
data := map[string]interface{}{
"issuer": issuer,
"authorization_endpoint": issuer + "/authorize",
"token_endpoint": issuer + "/token",
"jwks_uri": issuer + "/publickeys",
"response_types_supported": []string{"code"},
"subject_types_supported": []string{"public"},
"id_token_signing_alg_values_supported": []string{"RS256"},
"scopes_supported": []string{"openid", "email", "profile"},
"token_endpoint_auth_methods_supported": []string{"client_secret_basic"},
"claims_supported": []string{
"aud", "email", "email_verified", "exp",
"family_name", "given_name", "iat", "iss",
"locale", "name", "sub",
},
}
raw, err := json.MarshalIndent(data, "", " ")
if err != nil {
log.Printf("failed to marshal data: %v", err)
http.Error(w, "Internal server error", http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Content-Length", strconv.Itoa(len(raw)))
w.Write(raw)
}
// handlePublicKeys publishes the public part of this server's signing keys.
// This allows clients to verify the signature of ID Tokens.
func handlePublicKeys(w http.ResponseWriter, r *http.Request) {
raw, err := json.MarshalIndent(publicKeys, "", " ")
if err != nil {
log.Printf("failed to marshal data: %v", err)
http.Error(w, "Internal server error", http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Content-Length", strconv.Itoa(len(raw)))
w.Write(raw)
}
func handleAuthorization(w http.ResponseWriter, r *http.Request) {
resp := server.NewResponse()
defer resp.Close()
if ar := server.HandleAuthorizeRequest(resp, r); ar != nil {
if !example.HandleLoginPage(ar, w, r) {
return
}
ar.Authorized = true
scopes := make(map[string]bool)
for _, s := range strings.Fields(ar.Scope) {
scopes[s] = true
}
// If the "openid" connect scope is specified, attach an ID Token to the
// authorization response.
//
// The ID Token will be serialized and signed during the code for token exchange.
if scopes["openid"] {
// These values would be tied to the end user authorizing the client.
now := time.Now()
idToken := IDToken{
Issuer: issuer,
UserID: "id-of-test-user",
ClientID: ar.Client.GetId(),
Expiration: now.Add(time.Hour).Unix(),
IssuedAt: now.Unix(),
Nonce: r.URL.Query().Get("nonce"),
}
if scopes["profile"] {
idToken.Name = "Jane Doe"
idToken.GivenName = "Jane"
idToken.FamilyName = "Doe"
idToken.Locale = "us"
}
if scopes["email"] {
t := true
idToken.Email = "jane.doe@example.com"
idToken.EmailVerified = &t
}
// NOTE: The storage must be able to encode and decode this object.
ar.UserData = &idToken
}
server.FinishAuthorizeRequest(resp, r, ar)
}
if resp.IsError && resp.InternalError != nil {
log.Printf("internal error: %v", resp.InternalError)
}
osin.OutputJSON(resp, w, r)
}
func handleToken(w http.ResponseWriter, r *http.Request) {
resp := server.NewResponse()
defer resp.Close()
if ar := server.HandleAccessRequest(resp, r); ar != nil {
ar.Authorized = true
server.FinishAccessRequest(resp, r, ar)
// If an ID Token was encoded as the UserData, serialize and sign it.
if idToken, ok := ar.UserData.(*IDToken); ok && idToken != nil {
encodeIDToken(resp, idToken, jwtSigner)
}
}
if resp.IsError && resp.InternalError != nil {
fmt.Printf("ERROR: %s\n", resp.InternalError)
}
osin.OutputJSON(resp, w, r)
}
// encodeIDToken serializes and signs an ID Token then adds a field to the token response.
func encodeIDToken(resp *osin.Response, idToken *IDToken, singer jose.Signer) {
resp.InternalError = func() error {
payload, err := json.Marshal(idToken)
if err != nil {
return fmt.Errorf("failed to marshal token: %v", err)
}
jws, err := jwtSigner.Sign(payload)
if err != nil {
return fmt.Errorf("failed to sign token: %v", err)
}
raw, err := jws.CompactSerialize()
if err != nil {
return fmt.Errorf("failed to serialize token: %v", err)
}
resp.Output["id_token"] = raw
return nil
}()
// Record errors as internal server errors.
if resp.InternalError != nil {
resp.IsError = true
resp.ErrorId = osin.E_SERVER_ERROR
}
}
var (
privateKeyBytes = []byte(`-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----`)
)