121 lines
2.7 KiB
Go
121 lines
2.7 KiB
Go
package server
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import (
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"errors"
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"fmt"
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"net/http"
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"github.com/coreos/dex/client"
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"github.com/coreos/dex/pkg/log"
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"github.com/coreos/go-oidc/jose"
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"github.com/coreos/go-oidc/key"
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"github.com/coreos/go-oidc/oidc"
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)
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type clientTokenMiddleware struct {
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issuerURL string
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ciRepo client.ClientIdentityRepo
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keysFunc func() ([]key.PublicKey, error)
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next http.Handler
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}
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func (c *clientTokenMiddleware) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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respondError := func() {
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writeAPIError(w, http.StatusUnauthorized, newAPIError(errorAccessDenied, "missing or invalid token"))
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}
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if c.keysFunc == nil {
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log.Errorf("Misconfigured clientTokenMiddleware, keysFunc is not set")
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respondError()
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return
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}
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if c.ciRepo == nil {
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log.Errorf("Misconfigured clientTokenMiddleware, ClientIdentityRepo is not set")
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respondError()
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return
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}
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rawToken, err := oidc.ExtractBearerToken(r)
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if err != nil {
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log.Errorf("Failed to extract token from request: %v", err)
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respondError()
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return
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}
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jwt, err := jose.ParseJWT(rawToken)
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if err != nil {
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log.Errorf("Failed to parse JWT from token: %v", err)
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respondError()
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return
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}
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keys, err := c.keysFunc()
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if err != nil {
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log.Errorf("Failed to get keys: %v", err)
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writeAPIError(w, http.StatusUnauthorized, newAPIError(errorAccessDenied, ""))
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respondError()
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return
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} else if len(keys) == 0 {
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log.Error("No keys available for verification in client token middleware")
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writeAPIError(w, http.StatusUnauthorized, newAPIError(errorAccessDenied, ""))
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respondError()
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return
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}
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ok, err := oidc.VerifySignature(jwt, keys)
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if err != nil {
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log.Errorf("Failed to verify signature: %v", err)
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respondError()
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return
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} else if !ok {
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log.Info("Invalid token")
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respondError()
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return
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}
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clientID, err := oidc.VerifyClientClaims(jwt, c.issuerURL)
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if err != nil {
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log.Errorf("Failed to verify JWT claims: %v", err)
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respondError()
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return
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}
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md, err := c.ciRepo.Metadata(clientID)
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if md == nil || err != nil {
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log.Errorf("Failed to find clientID: %s, error=%v", clientID, err)
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respondError()
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return
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}
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log.Infof("Authenticated token for client ID %s", clientID)
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c.next.ServeHTTP(w, r)
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}
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// getClientIDFromAuthorizedRequest will extract the clientID from the bearer token.
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func getClientIDFromAuthorizedRequest(r *http.Request) (string, error) {
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rawToken, err := oidc.ExtractBearerToken(r)
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if err != nil {
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return "", err
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}
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jwt, err := jose.ParseJWT(rawToken)
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if err != nil {
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return "", err
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}
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claims, err := jwt.Claims()
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if err != nil {
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return "", err
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}
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sub, ok, err := claims.StringClaim("sub")
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if err != nil {
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return "", fmt.Errorf("failed to parse 'sub' claim: %v", err)
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} else if !ok || sub == "" {
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return "", errors.New("missing required 'sub' claim")
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}
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return sub, nil
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}
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