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authorize.go
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authorize.go
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package osin
import (
"net/http"
"net/url"
"regexp"
"time"
)
// AuthorizeRequestType is the type for OAuth param `response_type`
type AuthorizeRequestType string
const (
CODE AuthorizeRequestType = "code"
TOKEN AuthorizeRequestType = "token"
PKCE_PLAIN = "plain"
PKCE_S256 = "S256"
)
var (
pkceMatcher = regexp.MustCompile("^[a-zA-Z0-9~._-]{43,128}$")
)
// Authorize request information
type AuthorizeRequest struct {
Type AuthorizeRequestType
Client Client
Scope string
RedirectUri string
State string
// Set if request is authorized
Authorized bool
// Token expiration in seconds. Change if different from default.
// If type = TOKEN, this expiration will be for the ACCESS token.
Expiration int32
// Data to be passed to storage. Not used by the library.
UserData interface{}
// HttpRequest *http.Request for special use
HttpRequest *http.Request
// Optional code_challenge as described in rfc7636
CodeChallenge string
// Optional code_challenge_method as described in rfc7636
CodeChallengeMethod string
}
// Authorization data
type AuthorizeData struct {
// Client information
Client Client
// Authorization code
Code string
// Token expiration in seconds
ExpiresIn int32
// Requested scope
Scope string
// Redirect Uri from request
RedirectUri string
// State data from request
State string
// Date created
CreatedAt time.Time
// Data to be passed to storage. Not used by the library.
UserData interface{}
// Optional code_challenge as described in rfc7636
CodeChallenge string
// Optional code_challenge_method as described in rfc7636
CodeChallengeMethod string
}
// IsExpired is true if authorization expired
func (d *AuthorizeData) IsExpired() bool {
return d.IsExpiredAt(time.Now())
}
// IsExpired is true if authorization expires at time 't'
func (d *AuthorizeData) IsExpiredAt(t time.Time) bool {
return d.ExpireAt().Before(t)
}
// ExpireAt returns the expiration date
func (d *AuthorizeData) ExpireAt() time.Time {
return d.CreatedAt.Add(time.Duration(d.ExpiresIn) * time.Second)
}
// AuthorizeTokenGen is the token generator interface
type AuthorizeTokenGen interface {
GenerateAuthorizeToken(data *AuthorizeData) (string, error)
}
// HandleAuthorizeRequest is the main http.HandlerFunc for handling
// authorization requests
func (s *Server) HandleAuthorizeRequest(w *Response, r *http.Request) *AuthorizeRequest {
r.ParseForm()
ctx := r.Context()
// create the authorization request
unescapedUri, err := url.QueryUnescape(r.Form.Get("redirect_uri"))
if err != nil {
w.SetErrorState(E_INVALID_REQUEST, "", "")
w.InternalError = err
return nil
}
ret := &AuthorizeRequest{
State: r.Form.Get("state"),
Scope: r.Form.Get("scope"),
RedirectUri: unescapedUri,
Authorized: false,
HttpRequest: r,
}
// must have a valid client
ret.Client, err = w.Storage.GetClient(ctx, r.Form.Get("client_id"))
if err == ErrNotFound {
w.SetErrorState(E_UNAUTHORIZED_CLIENT, "", ret.State)
return nil
}
if err != nil {
w.SetErrorState(E_SERVER_ERROR, "", ret.State)
w.InternalError = err
return nil
}
if ret.Client == nil {
w.SetErrorState(E_UNAUTHORIZED_CLIENT, "", ret.State)
return nil
}
if ret.Client.GetRedirectUri() == "" {
w.SetErrorState(E_UNAUTHORIZED_CLIENT, "", ret.State)
return nil
}
// check redirect uri, if there are multiple client redirect uri's
// don't set the uri
if ret.RedirectUri == "" && FirstUri(ret.Client.GetRedirectUri(), s.Config.RedirectUriSeparator) == ret.Client.GetRedirectUri() {
ret.RedirectUri = FirstUri(ret.Client.GetRedirectUri(), s.Config.RedirectUriSeparator)
}
if err = ValidateUriList(ret.Client.GetRedirectUri(), ret.RedirectUri, s.Config.RedirectUriSeparator); err != nil {
w.SetErrorState(E_INVALID_REQUEST, "", ret.State)
w.InternalError = err
return nil
}
w.SetRedirect(ret.RedirectUri)
requestType := AuthorizeRequestType(r.Form.Get("response_type"))
if s.Config.AllowedAuthorizeTypes.Exists(requestType) {
switch requestType {
case CODE:
ret.Type = CODE
ret.Expiration = s.Config.AuthorizationExpiration
// Optional PKCE support (https://tools.ietf.org/html/rfc7636)
if codeChallenge := r.Form.Get("code_challenge"); len(codeChallenge) == 0 {
if s.Config.RequirePKCEForPublicClients && CheckClientSecret(ret.Client, "") {
// https://tools.ietf.org/html/rfc7636#section-4.4.1
w.SetErrorState(E_INVALID_REQUEST, "code_challenge (rfc7636) required for public clients", ret.State)
return nil
}
} else {
codeChallengeMethod := r.Form.Get("code_challenge_method")
// allowed values are "plain" (default) and "S256", per https://tools.ietf.org/html/rfc7636#section-4.3
if len(codeChallengeMethod) == 0 {
codeChallengeMethod = PKCE_PLAIN
}
if codeChallengeMethod != PKCE_PLAIN && codeChallengeMethod != PKCE_S256 {
// https://tools.ietf.org/html/rfc7636#section-4.4.1
w.SetErrorState(E_INVALID_REQUEST, "code_challenge_method transform algorithm not supported (rfc7636)", ret.State)
return nil
}
// https://tools.ietf.org/html/rfc7636#section-4.2
if matched := pkceMatcher.MatchString(codeChallenge); !matched {
w.SetErrorState(E_INVALID_REQUEST, "code_challenge invalid (rfc7636)", ret.State)
return nil
}
ret.CodeChallenge = codeChallenge
ret.CodeChallengeMethod = codeChallengeMethod
}
case TOKEN:
ret.Type = TOKEN
ret.Expiration = s.Config.AccessExpiration
}
return ret
}
w.SetErrorState(E_UNSUPPORTED_RESPONSE_TYPE, "", ret.State)
return nil
}
func (s *Server) FinishAuthorizeRequest(w *Response, r *http.Request, ar *AuthorizeRequest) {
// don't process if is already an error
ctx := r.Context()
if w.IsError {
return
}
// force redirect response
w.SetRedirect(ar.RedirectUri)
if ar.Authorized {
if ar.Type == TOKEN {
w.SetRedirectFragment(true)
// generate token directly
ret := &AccessRequest{
Type: IMPLICIT,
Code: "",
Client: ar.Client,
RedirectUri: ar.RedirectUri,
Scope: ar.Scope,
GenerateRefresh: true,
Authorized: true,
Expiration: ar.Expiration,
UserData: ar.UserData,
}
s.FinishAccessRequest(w, r, ret)
if ar.State != "" && w.InternalError == nil {
w.Output["state"] = ar.State
}
} else {
// generate authorization token
ret := &AuthorizeData{
Client: ar.Client,
CreatedAt: s.Now(),
ExpiresIn: ar.Expiration,
RedirectUri: ar.RedirectUri,
State: ar.State,
Scope: ar.Scope,
UserData: ar.UserData,
// Optional PKCE challenge
CodeChallenge: ar.CodeChallenge,
CodeChallengeMethod: ar.CodeChallengeMethod,
}
// generate token code
code, err := s.AuthorizeTokenGen.GenerateAuthorizeToken(ret)
if err != nil {
w.SetErrorState(E_SERVER_ERROR, "", ar.State)
w.InternalError = err
return
}
ret.Code = code
// save authorization token
if err = w.Storage.SaveAuthorize(ctx, ret); err != nil {
w.SetErrorState(E_SERVER_ERROR, "", ar.State)
w.InternalError = err
return
}
// redirect with code
w.Output["code"] = ret.Code
w.Output["state"] = ret.State
}
} else {
// redirect with error
w.SetErrorState(E_ACCESS_DENIED, "", ar.State)
}
}