sdk/go/arvadostest/oidc_provider.go

   1 // Copyright (C) The Arvados Authors. All rights reserved.
   2 //
   3 // SPDX-License-Identifier: Apache-2.0
   4
   5 package arvadostest
   6
   7 import (
   8         "crypto/rand"
   9         "crypto/rsa"
  10         "encoding/base64"
  11         "encoding/json"
  12         "fmt"
  13         "net/http"
  14         "net/http/httptest"
  15         "net/url"
  16         "strings"
  17         "time"
  18
  19         "gopkg.in/check.v1"
  20         "gopkg.in/go-jose/go-jose.v2"
  21         "gopkg.in/go-jose/go-jose.v2/jwt"
  22 )
  23
  24 type OIDCProvider struct {
  25         // expected token request
  26         ValidCode         string
  27         ValidClientID     string
  28         ValidClientSecret string
  29         // desired response from token endpoint
  30         AuthEmail          string
  31         AuthEmailVerified  bool
  32         AuthName           string
  33         AuthGivenName      string
  34         AuthFamilyName     string
  35         AccessTokenPayload map[string]interface{}
  36         // end_session_endpoint metadata URL.
  37         // If nil or empty, not included in discovery.
  38         // If relative, built from Issuer.URL.
  39         EndSessionEndpoint *url.URL
  40
  41         PeopleAPIResponse map[string]interface{}
  42
  43         // send incoming /userinfo requests to HoldUserInfo (if not
  44         // nil), then receive from ReleaseUserInfo (if not nil),
  45         // before responding (these are used to set up races)
  46         HoldUserInfo        chan *http.Request
  47         ReleaseUserInfo     chan struct{}
  48         UserInfoErrorStatus int // if non-zero, return this http status (probably 5xx)
  49
  50         key       *rsa.PrivateKey
  51         Issuer    *httptest.Server
  52         PeopleAPI *httptest.Server
  53         c         *check.C
  54 }
  55
  56 func NewOIDCProvider(c *check.C) *OIDCProvider {
  57         p := &OIDCProvider{c: c}
  58         var err error
  59         p.key, err = rsa.GenerateKey(rand.Reader, 2048)
  60         c.Assert(err, check.IsNil)
  61         p.Issuer = httptest.NewServer(http.HandlerFunc(p.serveOIDC))
  62         p.PeopleAPI = httptest.NewServer(http.HandlerFunc(p.servePeopleAPI))
  63         p.AccessTokenPayload = map[string]interface{}{"sub": "example"}
  64         return p
  65 }
  66
  67 func (p *OIDCProvider) ValidAccessToken() string {
  68         buf, _ := json.Marshal(p.AccessTokenPayload)
  69         return p.fakeToken(buf)
  70 }
  71
  72 func (p *OIDCProvider) serveOIDC(w http.ResponseWriter, req *http.Request) {
  73         req.ParseForm()
  74         p.c.Logf("serveOIDC: got req: %s %s %s", req.Method, req.URL, req.Form)
  75         w.Header().Set("Content-Type", "application/json")
  76         switch req.URL.Path {
  77         case "/.well-known/openid-configuration":
  78                 configuration := map[string]interface{}{
  79                         "issuer":                 p.Issuer.URL,
  80                         "authorization_endpoint": p.Issuer.URL + "/auth",
  81                         "token_endpoint":         p.Issuer.URL + "/token",
  82                         "jwks_uri":               p.Issuer.URL + "/jwks",
  83                         "userinfo_endpoint":      p.Issuer.URL + "/userinfo",
  84                 }
  85                 if p.EndSessionEndpoint == nil {
  86                         // Not included in configuration
  87                 } else if p.EndSessionEndpoint.Scheme != "" {
  88                         configuration["end_session_endpoint"] = p.EndSessionEndpoint.String()
  89                 } else {
  90                         u, err := url.Parse(p.Issuer.URL)
  91                         p.c.Check(err, check.IsNil,
  92                                 check.Commentf("error parsing IssuerURL for EndSessionEndpoint"))
  93                         u.Scheme = "https"
  94                         u.Path = u.Path + p.EndSessionEndpoint.Path
  95                         configuration["end_session_endpoint"] = u.String()
  96                 }
  97                 json.NewEncoder(w).Encode(configuration)
  98         case "/token":
  99                 var clientID, clientSecret string
 100                 auth, _ := base64.StdEncoding.DecodeString(strings.TrimPrefix(req.Header.Get("Authorization"), "Basic "))
 101                 authsplit := strings.Split(string(auth), ":")
 102                 if len(authsplit) == 2 {
 103                         clientID, _ = url.QueryUnescape(authsplit[0])
 104                         clientSecret, _ = url.QueryUnescape(authsplit[1])
 105                 }
 106                 if clientID != p.ValidClientID || clientSecret != p.ValidClientSecret {
 107                         p.c.Logf("OIDCProvider: expected (%q, %q) got (%q, %q)", p.ValidClientID, p.ValidClientSecret, clientID, clientSecret)
 108                         w.WriteHeader(http.StatusUnauthorized)
 109                         return
 110                 }
 111
 112                 if req.Form.Get("code") != p.ValidCode || p.ValidCode == "" {
 113                         w.WriteHeader(http.StatusUnauthorized)
 114                         return
 115                 }
 116                 idToken, _ := json.Marshal(map[string]interface{}{
 117                         "iss":            p.Issuer.URL,
 118                         "aud":            []string{clientID},
 119                         "sub":            "fake-user-id",
 120                         "exp":            time.Now().UTC().Add(time.Minute).Unix(),
 121                         "iat":            time.Now().UTC().Unix(),
 122                         "nonce":          "fake-nonce",
 123                         "email":          p.AuthEmail,
 124                         "email_verified": p.AuthEmailVerified,
 125                         "name":           p.AuthName,
 126                         "given_name":     p.AuthGivenName,
 127                         "family_name":    p.AuthFamilyName,
 128                         "alt_verified":   true,                    // for custom claim tests
 129                         "alt_email":      "alt_email@example.com", // for custom claim tests
 130                         "alt_username":   "desired-username",      // for custom claim tests
 131                 })
 132                 json.NewEncoder(w).Encode(struct {
 133                         AccessToken  string `json:"access_token"`
 134                         TokenType    string `json:"token_type"`
 135                         RefreshToken string `json:"refresh_token"`
 136                         ExpiresIn    int32  `json:"expires_in"`
 137                         IDToken      string `json:"id_token"`
 138                 }{
 139                         AccessToken:  p.ValidAccessToken(),
 140                         TokenType:    "Bearer",
 141                         RefreshToken: "test-refresh-token",
 142                         ExpiresIn:    30,
 143                         IDToken:      p.fakeToken(idToken),
 144                 })
 145         case "/jwks":
 146                 json.NewEncoder(w).Encode(jose.JSONWebKeySet{
 147                         Keys: []jose.JSONWebKey{
 148                                 {Key: p.key.Public(), Algorithm: string(jose.RS256), KeyID: ""},
 149                         },
 150                 })
 151         case "/auth":
 152                 w.WriteHeader(http.StatusInternalServerError)
 153         case "/userinfo":
 154                 if p.HoldUserInfo != nil {
 155                         p.HoldUserInfo <- req
 156                 }
 157                 if p.ReleaseUserInfo != nil {
 158                         <-p.ReleaseUserInfo
 159                 }
 160                 if p.UserInfoErrorStatus > 0 {
 161                         w.WriteHeader(p.UserInfoErrorStatus)
 162                         fmt.Fprintf(w, "%T error body", p)
 163                         return
 164                 }
 165                 authhdr := req.Header.Get("Authorization")
 166                 if _, err := jwt.ParseSigned(strings.TrimPrefix(authhdr, "Bearer ")); err != nil {
 167                         p.c.Logf("OIDCProvider: bad auth %q", authhdr)
 168                         w.WriteHeader(http.StatusUnauthorized)
 169                         return
 170                 }
 171                 json.NewEncoder(w).Encode(map[string]interface{}{
 172                         "sub":            "fake-user-id",
 173                         "name":           p.AuthName,
 174                         "given_name":     p.AuthGivenName,
 175                         "family_name":    p.AuthFamilyName,
 176                         "alt_username":   "desired-username",
 177                         "email":          p.AuthEmail,
 178                         "email_verified": p.AuthEmailVerified,
 179                 })
 180         default:
 181                 w.WriteHeader(http.StatusNotFound)
 182         }
 183 }
 184
 185 func (p *OIDCProvider) servePeopleAPI(w http.ResponseWriter, req *http.Request) {
 186         req.ParseForm()
 187         p.c.Logf("servePeopleAPI: got req: %s %s %s", req.Method, req.URL, req.Form)
 188         w.Header().Set("Content-Type", "application/json")
 189         switch req.URL.Path {
 190         case "/v1/people/me":
 191                 if f := req.Form.Get("personFields"); f != "emailAddresses,names" {
 192                         w.WriteHeader(http.StatusBadRequest)
 193                         break
 194                 }
 195                 json.NewEncoder(w).Encode(p.PeopleAPIResponse)
 196         default:
 197                 w.WriteHeader(http.StatusNotFound)
 198         }
 199 }
 200
 201 func (p *OIDCProvider) fakeToken(payload []byte) string {
 202         signer, err := jose.NewSigner(jose.SigningKey{Algorithm: jose.RS256, Key: p.key}, nil)
 203         if err != nil {
 204                 p.c.Error(err)
 205                 return ""
 206         }
 207         object, err := signer.Sign(payload)
 208         if err != nil {
 209                 p.c.Error(err)
 210                 return ""
 211         }
 212         t, err := object.CompactSerialize()
 213         if err != nil {
 214                 p.c.Error(err)
 215                 return ""
 216         }
 217         p.c.Logf("fakeToken(%q) == %q", payload, t)
 218         return t
 219 }