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grant.go
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grant.go
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package auth
import (
"context"
"errors"
"fmt"
"net/http"
"time"
log "github.com/sirupsen/logrus"
"github.com/zalando/skipper/filters"
"golang.org/x/oauth2"
)
const (
OAuthGrantName = "oauthGrant"
secretsRefreshInternal = time.Minute
tokenWasRefreshed = "oauth-did-refresh"
)
var (
errExpiredToken = errors.New("expired access token")
)
type grantSpec struct {
config OAuthConfig
}
type grantFilter struct {
config OAuthConfig
}
func (s *grantSpec) Name() string { return OAuthGrantName }
func (s *grantSpec) CreateFilter([]interface{}) (filters.Filter, error) {
return &grantFilter{
config: s.config,
}, nil
}
func providerContext(c OAuthConfig) context.Context {
return context.WithValue(context.Background(), oauth2.HTTPClient, c.AuthClient)
}
func serverError(ctx filters.FilterContext) {
ctx.Serve(&http.Response{
StatusCode: http.StatusInternalServerError,
})
}
func badRequest(ctx filters.FilterContext) {
ctx.Serve(&http.Response{
StatusCode: http.StatusBadRequest,
})
}
func loginRedirect(ctx filters.FilterContext, config OAuthConfig) {
loginRedirectWithOverride(ctx, config, "")
}
func loginRedirectWithOverride(ctx filters.FilterContext, config OAuthConfig, originalOverride string) {
req := ctx.Request()
redirect, original := config.RedirectURLs(req)
if originalOverride != "" {
original = originalOverride
}
state, err := config.flowState.createState(original)
if err != nil {
log.Errorf("Failed to create login redirect: %v", err)
serverError(ctx)
return
}
authConfig := config.GetConfig()
ctx.Serve(&http.Response{
StatusCode: http.StatusTemporaryRedirect,
Header: http.Header{
"Location": []string{authConfig.AuthCodeURL(state, config.GetAuthURLParameters(redirect)...)},
},
})
}
func (f *grantFilter) refreshToken(c cookie) (*oauth2.Token, error) {
// Set the expiry of the token to the past to trigger oauth2.TokenSource
// to refresh the access token.
token := &oauth2.Token{
AccessToken: c.AccessToken,
RefreshToken: c.RefreshToken,
Expiry: time.Now().Add(-time.Minute),
}
ctx := providerContext(f.config)
// oauth2.TokenSource implements the refresh functionality,
// we're hijacking it here.
tokenSource := f.config.GetConfig().TokenSource(ctx, token)
return tokenSource.Token()
}
func (f *grantFilter) refreshTokenIfRequired(c cookie, ctx filters.FilterContext) (*oauth2.Token, error) {
canRefresh := c.RefreshToken != ""
if c.isAccessTokenExpired() {
if canRefresh {
token, err := f.refreshToken(c)
if err == nil {
// Remember that this token was just successfully refreshed
// so that we can send an updated cookie in the response.
ctx.StateBag()[tokenWasRefreshed] = true
}
return token, err
} else {
return nil, errExpiredToken
}
} else {
return &oauth2.Token{
AccessToken: c.AccessToken,
TokenType: "Bearer",
RefreshToken: c.RefreshToken,
Expiry: c.Expiry,
}, nil
}
}
func (f *grantFilter) setAccessTokenHeader(req *http.Request, token string) {
if f.config.AccessTokenHeaderName != "" {
req.Header.Set(f.config.AccessTokenHeaderName, authHeaderPrefix+token)
}
}
func (f *grantFilter) createTokenContainer(token *oauth2.Token, tokeninfo map[string]interface{}) (tokenContainer, error) {
subject := ""
if f.config.TokeninfoSubjectKey != "" {
if s, ok := tokeninfo[f.config.TokeninfoSubjectKey].(string); ok {
subject = s
} else {
return tokenContainer{}, fmt.Errorf("tokeninfo subject key '%s' is missing", f.config.TokeninfoSubjectKey)
}
}
tokeninfo["sub"] = subject
return tokenContainer{
OAuth2Token: token,
Subject: subject,
Claims: tokeninfo,
}, nil
}
func (f *grantFilter) Request(ctx filters.FilterContext) {
req := ctx.Request()
c, err := extractCookie(req, f.config)
if err == http.ErrNoCookie {
loginRedirect(ctx, f.config)
return
}
token, err := f.refreshTokenIfRequired(*c, ctx)
if err != nil && c.isAccessTokenExpired() {
// Refresh failed and we no longer have a valid access token.
loginRedirect(ctx, f.config)
return
}
tokeninfo, err := f.config.TokeninfoClient.getTokeninfo(token.AccessToken, ctx)
if err != nil {
if err != errInvalidToken {
log.Errorf("Failed to call tokeninfo: %v.", err)
}
loginRedirect(ctx, f.config)
return
}
f.setAccessTokenHeader(req, token.AccessToken)
tokenContainer, err := f.createTokenContainer(token, tokeninfo)
if err != nil {
log.Errorf("Failed to create token container: %v.", err)
loginRedirect(ctx, f.config)
return
}
// Set token in state bag for response Set-Cookie. By piggy-backing
// on the OIDC token container, we gain downstream compatibility with
// the oidcClaimsQuery filter.
ctx.StateBag()[oidcClaimsCacheKey] = tokenContainer
// Set the tokeninfo also in the tokeninfoCacheKey state bag, so we
// can reuse e.g. the forwardToken() filter.
ctx.StateBag()[tokeninfoCacheKey] = tokeninfo
}
func (f *grantFilter) Response(ctx filters.FilterContext) {
// If the token was refreshed in this request flow,
// we want to send an updated cookie. If it wasn't, the
// users will still have their old cookie and we do not
// need to send it again and this function can exit early.
didRefresh, ok := ctx.StateBag()[tokenWasRefreshed].(bool)
if !didRefresh || !ok {
return
}
container, ok := ctx.StateBag()[oidcClaimsCacheKey].(tokenContainer)
if !ok {
return
}
req := ctx.Request()
c, err := createCookie(f.config, req.Host, container.OAuth2Token)
if err != nil {
log.Errorf("Failed to generate cookie: %v.", err)
return
}
rsp := ctx.Response()
rsp.Header.Add("Set-Cookie", c.String())
}