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token_endpoint.go
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token_endpoint.go
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package goidc
import (
"fmt"
"net/http"
"github.com/golang-jwt/jwt"
"github.com/lyokato/goidc/assertion"
"github.com/lyokato/goidc/bridge"
"github.com/lyokato/goidc/grant"
"github.com/lyokato/goidc/io"
"github.com/lyokato/goidc/log"
oer "github.com/lyokato/goidc/oauth_error"
)
const ClientAssertionTypeJWT = "urn:ietf:params:oauth:client-assertion-type:jwt-bearer"
type CredentialAcceptanceMethod int
const (
FromHeader CredentialAcceptanceMethod = iota
FromHeaderAndPostBody
FromAll
)
var defaultResponseHeaders = map[string]string{
"Cache-Control": "no-store",
"Pragma": "no-cache",
"Content-Type": "application/json; charset=UTF-8",
}
type TokenEndpoint struct {
realm string
logger log.Logger
handlers map[string]grant.GrantHandlerFunc
errorURIBuilder oer.OAuthErrorURIBuilder
clientSecretAcceptanceMethod CredentialAcceptanceMethod
acceptClientAssertion bool
currentTime io.TimeBuilder
}
func (te *TokenEndpoint) AcceptClientSecret(
meth CredentialAcceptanceMethod) {
te.clientSecretAcceptanceMethod = meth
}
func (te *TokenEndpoint) AcceptClientAssertion(accept bool) {
te.acceptClientAssertion = accept
}
func (te *TokenEndpoint) SetLogger(l log.Logger) {
te.logger = l
}
func (te *TokenEndpoint) SetTimeBuilder(builder io.TimeBuilder) {
te.currentTime = builder
}
func (te *TokenEndpoint) SetErrorURI(uri string) {
te.errorURIBuilder = func(_ oer.OAuthErrorType) string { return uri }
}
func (te *TokenEndpoint) SetErrorURIBuilder(builder oer.OAuthErrorURIBuilder) {
te.errorURIBuilder = builder
}
func NewTokenEndpoint(realm string) *TokenEndpoint {
return &TokenEndpoint{
realm: realm,
logger: log.NewDefaultLogger(),
handlers: make(map[string]grant.GrantHandlerFunc),
clientSecretAcceptanceMethod: FromHeader,
acceptClientAssertion: false,
currentTime: io.NowBuilder(),
}
}
func (te *TokenEndpoint) Support(handler *grant.GrantHandler) {
te.handlers[handler.Type] = handler.Func
}
func (te *TokenEndpoint) Handler(sdi bridge.DataInterface) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
if r.Method != "POST" {
te.logger.Debug(log.TokenEndpointLog("common", log.InvalidHTTPMethod,
map[string]string{"http_method": r.Method},
"http method is not POST"))
w.WriteHeader(http.StatusMethodNotAllowed)
return
}
gt := r.FormValue("grant_type")
if gt == "" {
te.logger.Debug(log.TokenEndpointLog("common", log.MissingParam,
map[string]string{"param": "grant_type"},
"'grant_type' not found"))
te.fail(w, oer.NewOAuthError(oer.ErrInvalidRequest,
"missing 'grant_type' parameter"))
return
}
h, exists := te.handlers[gt]
if !exists {
te.logger.Debug(log.TokenEndpointLog("common", log.UnsupportedGrantType,
map[string]string{"grant_type": gt},
"unsupported 'grant_type'"))
te.fail(w, oer.NewOAuthError(oer.ErrUnsupportedGrantType,
fmt.Sprintf("unsupported 'grant_type' parameter: '%s'", gt)))
return
}
cid, sec, inHeader, exists := te.findClientCredential(r)
if exists {
client, ok := te.validateClientBySecret(w, r,
sdi, gt, cid, sec, inHeader)
if ok {
te.executeGrantHandler(w, r, sdi, client, gt, h)
}
return
}
if te.acceptClientAssertion {
ca, exists := te.findClientAssertion(r)
if exists {
client, ok := te.validateClientByAssertion(w, r,
sdi, gt, ca)
if ok {
te.executeGrantHandler(w, r, sdi, client, gt, h)
}
return
}
}
te.logger.Debug(log.TokenEndpointLog(gt, log.NoCredential,
map[string]string{"grant_type": gt},
"credential information not found."))
te.failWithAuthHeader(w,
oer.NewOAuthSimpleError(oer.ErrInvalidClient))
return
}
}
func (te *TokenEndpoint) validateClientByAssertion(w http.ResponseWriter,
r *http.Request, sdi bridge.DataInterface,
gt, ca string) (bridge.Client, bool) {
// RFC7523
// JSON Web Token (JWT) Profile
// for OAuth 2.0 Client Authentication and Authorization Grants
var c bridge.Client
t, jwt_err := jwt.Parse(ca, func(t *jwt.Token) (interface{}, error) {
cid := ""
claims := t.Claims.(jwt.MapClaims)
if found, ok := claims["sub"].(string); ok {
cid = found
} else {
te.logger.Debug(log.TokenEndpointLog(gt,
log.MissingParam,
map[string]string{"assertion": ca},
"'sub' not found in assertion"))
return nil, oer.NewOAuthError(oer.ErrInvalidRequest,
"'sub' parameter not found in assertion")
}
var serr *bridge.Error
c, serr = sdi.FindClientById(cid)
if serr != nil {
if serr.Type() == bridge.ErrFailed {
te.logger.Info(log.TokenEndpointLog(gt,
log.NoEnabledClient,
map[string]string{
"method": "FindClientById",
"assertion": ca,
"client_id": cid,
},
"client associated with the sub value in assertion not found"))
return nil, oer.NewOAuthSimpleError(oer.ErrInvalidClient)
} else if serr.Type() == bridge.ErrUnsupported {
te.logger.Error(log.TokenEndpointLog(gt,
log.InterfaceUnsupported,
map[string]string{"method": "FindClientById"},
"the method returns 'unsupported' error."))
return nil, oer.NewOAuthSimpleError(oer.ErrServerError)
} else {
te.logger.Warn(log.TokenEndpointLog(gt,
log.InterfaceServerError,
map[string]string{
"method": "FindClientById",
"assertion": ca,
"client_id": cid,
},
"interface returned ServerError"))
return nil, oer.NewOAuthSimpleError(oer.ErrServerError)
}
} else {
if c == nil {
te.logger.Error(log.TokenEndpointLog(gt,
log.InterfaceError,
map[string]string{
"method": "FindClientById",
"assertion": ca,
"client_id": cid,
},
"the method returns (nil, nil)."))
return nil, oer.NewOAuthSimpleError(oer.ErrServerError)
}
}
alg := ""
kid := ""
if found, ok := t.Header["alg"].(string); ok {
alg = found
}
if found, ok := t.Header["kid"].(string); ok {
kid = found
}
key := c.GetAssertionKey(alg, kid)
if key == nil {
te.logger.Debug(log.TokenEndpointLog(gt,
log.MissingParam,
map[string]string{
"assertion": ca,
"method": "AssertionKey",
},
"returns nil as key"))
return nil, fmt.Errorf("key_not_found")
} else {
return key, nil
}
})
err := assertion.HandleAssertionError(ca, t, jwt_err, gt, c, sdi, te.logger)
if err != nil {
te.fail(w, err)
return nil, false
}
return c, true
}
func (te *TokenEndpoint) validateClientBySecret(w http.ResponseWriter,
r *http.Request, sdi bridge.DataInterface, gt, cid, sec string,
inHeader bool) (bridge.Client, bool) {
client, err := sdi.FindClientById(cid)
if err != nil {
if err.Type() == bridge.ErrFailed {
te.logger.Debug(log.TokenEndpointLog(gt, log.NoEnabledClient,
map[string]string{"method": "FindClientById", "client_id": cid},
"client not found."))
te.failByInvalidClientError(w, inHeader)
return nil, false
} else if err.Type() == bridge.ErrUnsupported {
te.logger.Error(log.TokenEndpointLog(gt, log.InterfaceUnsupported,
map[string]string{"method": "FindClientById"},
"the method returns 'unsupported' error."))
te.fail(w, oer.NewOAuthSimpleError(oer.ErrServerError))
return nil, false
} else {
te.logger.Warn(log.TokenEndpointLog(gt, log.InterfaceServerError,
map[string]string{"method": "FindClientById", "client_id": cid},
"interface returned ServerError"))
te.fail(w, oer.NewOAuthSimpleError(oer.ErrServerError))
return nil, false
}
} else {
if client == nil {
te.logger.Error(log.TokenEndpointLog(gt, log.InterfaceError,
map[string]string{"method": "FindClientById", "client_id": cid},
"the method returns (nil, nil)."))
te.fail(w, oer.NewOAuthSimpleError(oer.ErrServerError))
return nil, false
}
}
if !client.MatchSecret(sec) {
te.logger.Info(log.TokenEndpointLog(gt, log.AuthenticationFailed,
map[string]string{
"client_id": cid,
"remote_addr": r.Header.Get("REMOTE_ADDR"),
"x-forwarded-for": r.Header.Get("X-FORWARDED-FOR"),
}, "'client_secret' mismatch."))
te.failByInvalidClientError(w, inHeader)
return nil, false
}
if !client.CanUseGrantType(gt) {
te.logger.Info(log.TokenEndpointLog(gt, log.UnauthorizedGrantType,
map[string]string{"client_id": cid}, "unauthorized 'grant_type'."))
te.fail(w, oer.NewOAuthSimpleError(oer.ErrUnauthorizedClient))
return nil, false
}
return client, true
}
func (te *TokenEndpoint) executeGrantHandler(w http.ResponseWriter,
r *http.Request, sdi bridge.DataInterface,
client bridge.Client, gt string, h grant.GrantHandlerFunc) {
res, oerr := h(r, client, sdi, te.logger, te.currentTime())
if oerr != nil {
te.fail(w, oerr)
return
} else {
te.logger.Debug(log.TokenEndpointLog(gt, log.AccessTokenGranted,
map[string]string{"client_id": client.GetId()},
"granted successfully"))
te.success(w, res)
return
}
}
func (te *TokenEndpoint) failByInvalidClientError(w http.ResponseWriter, inHeader bool) {
if inHeader {
te.failWithAuthHeader(w, oer.NewOAuthSimpleError(oer.ErrInvalidClient))
} else {
te.fail(w, oer.NewOAuthSimpleError(oer.ErrInvalidClient))
}
}
func (te *TokenEndpoint) findClientCredential(r *http.Request) (string, string, bool, bool) {
cid, sec, exists := r.BasicAuth()
if exists {
return cid, sec, true, true
}
switch te.clientSecretAcceptanceMethod {
case FromHeader:
return "", "", false, false
case FromHeaderAndPostBody:
cid = r.PostFormValue("client_id")
sec = r.PostFormValue("client_secret")
if cid != "" && sec != "" {
return cid, sec, false, true
} else {
return "", "", false, false
}
case FromAll:
cid = r.FormValue("client_id")
sec = r.FormValue("client_secret")
if cid != "" && sec != "" {
return cid, sec, false, true
} else {
return "", "", false, false
}
default:
return "", "", false, false
}
}
func (te *TokenEndpoint) findClientAssertion(r *http.Request) (string, bool) {
ca := r.FormValue("client_assertion")
cat := r.FormValue("client_assertion_type")
if ca != "" && cat == ClientAssertionTypeJWT {
return ca, true
} else {
return "", false
}
}
func setCommonResponseHeader(w http.ResponseWriter) {
for k, v := range defaultResponseHeaders {
w.Header().Set(k, v)
}
}
func (te *TokenEndpoint) success(w http.ResponseWriter, res *grant.Response) {
setCommonResponseHeader(w)
w.WriteHeader(http.StatusOK)
w.Write(res.JSON())
}
func (te *TokenEndpoint) failWithAuthHeader(w http.ResponseWriter, err *oer.OAuthError) {
w.Header().Set("WWW-Authenticate", fmt.Sprintf("Basic realm=\"%s\"", te.realm))
setCommonResponseHeader(w)
if err.URI == "" && te.errorURIBuilder != nil {
err.URI = te.errorURIBuilder(err.Type)
}
w.WriteHeader(http.StatusUnauthorized)
w.Write(err.JSON())
}
func (te *TokenEndpoint) fail(w http.ResponseWriter, err *oer.OAuthError) {
setCommonResponseHeader(w)
if err.URI == "" && te.errorURIBuilder != nil {
err.URI = te.errorURIBuilder(err.Type)
}
w.WriteHeader(err.StatusCode())
w.Write(err.JSON())
}