107 lines
4 KiB
Go
107 lines
4 KiB
Go
package op
|
|
|
|
import (
|
|
"context"
|
|
"errors"
|
|
"net/http"
|
|
|
|
"github.com/caos/oidc/pkg/oidc"
|
|
"github.com/caos/oidc/pkg/utils"
|
|
)
|
|
|
|
//CodeExchange handles the OAuth 2.0 authorization_code grant, including
|
|
//parsing, validating, authorizing the client and finally exchanging the code for tokens
|
|
func CodeExchange(w http.ResponseWriter, r *http.Request, exchanger Exchanger) {
|
|
tokenReq, err := ParseAccessTokenRequest(r, exchanger.Decoder())
|
|
if err != nil {
|
|
RequestError(w, r, err)
|
|
}
|
|
if tokenReq.Code == "" {
|
|
RequestError(w, r, ErrInvalidRequest("code missing"))
|
|
return
|
|
}
|
|
authReq, client, err := ValidateAccessTokenRequest(r.Context(), tokenReq, exchanger)
|
|
if err != nil {
|
|
RequestError(w, r, err)
|
|
return
|
|
}
|
|
resp, err := CreateTokenResponse(r.Context(), authReq, client, exchanger, true, tokenReq.Code, "")
|
|
if err != nil {
|
|
RequestError(w, r, err)
|
|
return
|
|
}
|
|
utils.MarshalJSON(w, resp)
|
|
}
|
|
|
|
//ParseAccessTokenRequest parsed the http request into a oidc.AccessTokenRequest
|
|
func ParseAccessTokenRequest(r *http.Request, decoder utils.Decoder) (*oidc.AccessTokenRequest, error) {
|
|
request := new(oidc.AccessTokenRequest)
|
|
err := ParseAuthenticatedTokenRequest(r, decoder, request)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return request, nil
|
|
}
|
|
|
|
//ValidateAccessTokenRequest validates the token request parameters including authorization check of the client
|
|
//and returns the previous created auth request corresponding to the auth code
|
|
func ValidateAccessTokenRequest(ctx context.Context, tokenReq *oidc.AccessTokenRequest, exchanger Exchanger) (AuthRequest, Client, error) {
|
|
authReq, client, err := AuthorizeCodeClient(ctx, tokenReq, exchanger)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
if client.GetID() != authReq.GetClientID() {
|
|
return nil, nil, ErrInvalidRequest("invalid auth code")
|
|
}
|
|
if tokenReq.RedirectURI != authReq.GetRedirectURI() {
|
|
return nil, nil, ErrInvalidRequest("redirect_uri does not correspond")
|
|
}
|
|
return authReq, client, nil
|
|
}
|
|
|
|
//AuthorizeCodeClient checks the authorization of the client and that the used method was the one previously registered.
|
|
//It than returns the auth request corresponding to the auth code
|
|
func AuthorizeCodeClient(ctx context.Context, tokenReq *oidc.AccessTokenRequest, exchanger Exchanger) (request AuthRequest, client Client, err error) {
|
|
if tokenReq.ClientAssertionType == oidc.ClientAssertionTypeJWTAssertion {
|
|
jwtExchanger, ok := exchanger.(JWTAuthorizationGrantExchanger)
|
|
if !ok || !exchanger.AuthMethodPrivateKeyJWTSupported() {
|
|
return nil, nil, errors.New("auth_method private_key_jwt not supported")
|
|
}
|
|
client, err = AuthorizePrivateJWTKey(ctx, tokenReq.ClientAssertion, jwtExchanger)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
request, err = AuthRequestByCode(ctx, exchanger.Storage(), tokenReq.Code)
|
|
return request, client, err
|
|
}
|
|
client, err = exchanger.Storage().GetClientByClientID(ctx, tokenReq.ClientID)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
if client.AuthMethod() == oidc.AuthMethodPrivateKeyJWT {
|
|
return nil, nil, errors.New("invalid_grant")
|
|
}
|
|
if client.AuthMethod() == oidc.AuthMethodNone {
|
|
request, err = AuthRequestByCode(ctx, exchanger.Storage(), tokenReq.Code)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
err = AuthorizeCodeChallenge(tokenReq, request.GetCodeChallenge())
|
|
return request, client, err
|
|
}
|
|
if client.AuthMethod() == oidc.AuthMethodPost && !exchanger.AuthMethodPostSupported() {
|
|
return nil, nil, errors.New("auth_method post not supported")
|
|
}
|
|
err = AuthorizeClientIDSecret(ctx, tokenReq.ClientID, tokenReq.ClientSecret, exchanger.Storage())
|
|
request, err = AuthRequestByCode(ctx, exchanger.Storage(), tokenReq.Code)
|
|
return request, client, err
|
|
}
|
|
|
|
//AuthRequestByCode returns the AuthRequest previously created from Storage corresponding to the auth code or an error
|
|
func AuthRequestByCode(ctx context.Context, storage Storage, code string) (AuthRequest, error) {
|
|
authReq, err := storage.AuthRequestByCode(ctx, code)
|
|
if err != nil {
|
|
return nil, ErrInvalidRequest("invalid code")
|
|
}
|
|
return authReq, nil
|
|
}
|