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oidc_server_test.go
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oidc_server_test.go
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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package oidcauthextension
import (
"bytes"
"crypto"
"crypto/rand"
"crypto/rsa"
"crypto/sha1" // #nosec
"crypto/sha256"
"crypto/x509"
"crypto/x509/pkix"
"encoding/base64"
"encoding/binary"
"encoding/json"
"fmt"
"math/big"
"net/http"
"net/http/httptest"
"time"
)
// oidcServer is an overly simplified OIDC mock server, good enough to sign the tokens required by the test
// and pass the verification done by the underlying libraries
type oidcServer struct {
*httptest.Server
x509Cert []byte
privateKey *rsa.PrivateKey
}
func newOIDCServer() (*oidcServer, error) {
jwks := map[string]any{}
mux := http.NewServeMux()
server := httptest.NewUnstartedServer(mux)
mux.HandleFunc("/.well-known/openid-configuration", func(w http.ResponseWriter, _ *http.Request) {
w.Header().Set("Content-Type", "application/json; charset=utf-8")
err := json.NewEncoder(w).Encode(map[string]any{
"issuer": server.URL,
"jwks_uri": fmt.Sprintf("%s/.well-known/jwks.json", server.URL),
})
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
return
}
})
mux.HandleFunc("/.well-known/jwks.json", func(w http.ResponseWriter, _ *http.Request) {
w.Header().Set("Content-Type", "application/json; charset=utf-8")
if err := json.NewEncoder(w).Encode(jwks); err != nil {
w.WriteHeader(http.StatusInternalServerError)
return
}
})
privateKey, err := createPrivateKey()
if err != nil {
return nil, err
}
x509Cert, err := createCertificate(privateKey)
if err != nil {
return nil, err
}
eBytes := make([]byte, 8)
binary.BigEndian.PutUint64(eBytes, uint64(privateKey.E))
eBytes = bytes.TrimLeft(eBytes, "\x00")
// #nosec
sum := sha1.Sum(x509Cert)
jwks["keys"] = []map[string]any{{
"alg": "RS256",
"kty": "RSA",
"use": "sig",
"x5c": []string{base64.StdEncoding.EncodeToString(x509Cert)},
"n": base64.RawURLEncoding.EncodeToString(privateKey.N.Bytes()),
"e": base64.RawURLEncoding.EncodeToString(eBytes),
"kid": base64.RawURLEncoding.EncodeToString(sum[:]),
"x5t": base64.RawURLEncoding.EncodeToString(sum[:]),
}}
return &oidcServer{server, x509Cert, privateKey}, nil
}
func (s *oidcServer) token(jsonPayload []byte) (string, error) {
jsonHeader, err := json.Marshal(map[string]any{
"alg": "RS256",
"typ": "JWT",
})
if err != nil {
return "", err
}
header := base64.RawURLEncoding.EncodeToString(jsonHeader)
payload := base64.RawURLEncoding.EncodeToString(jsonPayload)
digest := sha256.Sum256([]byte(fmt.Sprintf("%s.%s", header, payload)))
signature, err := rsa.SignPKCS1v15(rand.Reader, s.privateKey, crypto.SHA256, digest[:])
if err != nil {
return "", err
}
encodedSignature := base64.RawURLEncoding.EncodeToString(signature)
token := fmt.Sprintf("%s.%s.%s", header, payload, encodedSignature)
return token, nil
}
func createCertificate(privateKey *rsa.PrivateKey) ([]byte, error) {
cert := x509.Certificate{
SerialNumber: big.NewInt(1),
Subject: pkix.Name{
Organization: []string{"Ecorp, Inc"},
},
NotBefore: time.Now(),
NotAfter: time.Now().Add(5 * time.Minute),
}
x509Cert, err := x509.CreateCertificate(rand.Reader, &cert, &cert, &privateKey.PublicKey, privateKey)
if err != nil {
return nil, err
}
return x509Cert, nil
}
func createPrivateKey() (*rsa.PrivateKey, error) {
priv, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
return nil, err
}
return priv, nil
}