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dex/vendor/github.com/coreos/go-oidc/verify.go
2019-06-20 12:27:47 -04:00

243 lines
8.3 KiB
Go

package oidc
import (
"bytes"
"context"
"encoding/base64"
"encoding/json"
"errors"
"fmt"
"strings"
"time"
"golang.org/x/oauth2"
jose "gopkg.in/square/go-jose.v2"
)
const (
issuerGoogleAccounts = "https://accounts.google.com"
issuerGoogleAccountsNoScheme = "accounts.google.com"
)
// KeySet is a set of publc JSON Web Keys that can be used to validate the signature
// of JSON web tokens. This is expected to be backed by a remote key set through
// provider metadata discovery or an in-memory set of keys delivered out-of-band.
type KeySet interface {
// VerifySignature parses the JSON web token, verifies the signature, and returns
// the raw payload. Header and claim fields are validated by other parts of the
// package. For example, the KeySet does not need to check values such as signature
// algorithm, issuer, and audience since the IDTokenVerifier validates these values
// independently.
//
// If VerifySignature makes HTTP requests to verify the token, it's expected to
// use any HTTP client associated with the context through ClientContext.
VerifySignature(ctx context.Context, jwt string) (payload []byte, err error)
}
// IDTokenVerifier provides verification for ID Tokens.
type IDTokenVerifier struct {
keySet KeySet
config *Config
issuer string
}
// NewVerifier returns a verifier manually constructed from a key set and issuer URL.
//
// It's easier to use provider discovery to construct an IDTokenVerifier than creating
// one directly. This method is intended to be used with provider that don't support
// metadata discovery, or avoiding round trips when the key set URL is already known.
//
// This constructor can be used to create a verifier directly using the issuer URL and
// JSON Web Key Set URL without using discovery:
//
// keySet := oidc.NewRemoteKeySet(ctx, "https://www.googleapis.com/oauth2/v3/certs")
// verifier := oidc.NewVerifier("https://accounts.google.com", keySet, config)
//
// Since KeySet is an interface, this constructor can also be used to supply custom
// public key sources. For example, if a user wanted to supply public keys out-of-band
// and hold them statically in-memory:
//
// // Custom KeySet implementation.
// keySet := newStatisKeySet(publicKeys...)
//
// // Verifier uses the custom KeySet implementation.
// verifier := oidc.NewVerifier("https://auth.example.com", keySet, config)
//
func NewVerifier(issuerURL string, keySet KeySet, config *Config) *IDTokenVerifier {
return &IDTokenVerifier{keySet: keySet, config: config, issuer: issuerURL}
}
// Config is the configuration for an IDTokenVerifier.
type Config struct {
// Expected audience of the token. For a majority of the cases this is expected to be
// the ID of the client that initialized the login flow. It may occasionally differ if
// the provider supports the authorizing party (azp) claim.
//
// If not provided, users must explicitly set SkipClientIDCheck.
ClientID string
// If specified, only this set of algorithms may be used to sign the JWT.
//
// Since many providers only support RS256, SupportedSigningAlgs defaults to this value.
SupportedSigningAlgs []string
// If true, no ClientID check performed. Must be true if ClientID field is empty.
SkipClientIDCheck bool
// If true, token expiry is not checked.
SkipExpiryCheck bool
// Time function to check Token expiry. Defaults to time.Now
Now func() time.Time
}
// Verifier returns an IDTokenVerifier that uses the provider's key set to verify JWTs.
//
// The returned IDTokenVerifier is tied to the Provider's context and its behavior is
// undefined once the Provider's context is canceled.
func (p *Provider) Verifier(config *Config) *IDTokenVerifier {
return NewVerifier(p.issuer, p.remoteKeySet, config)
}
func parseJWT(p string) ([]byte, error) {
parts := strings.Split(p, ".")
if len(parts) < 2 {
return nil, fmt.Errorf("oidc: malformed jwt, expected 3 parts got %d", len(parts))
}
payload, err := base64.RawURLEncoding.DecodeString(parts[1])
if err != nil {
return nil, fmt.Errorf("oidc: malformed jwt payload: %v", err)
}
return payload, nil
}
func contains(sli []string, ele string) bool {
for _, s := range sli {
if s == ele {
return true
}
}
return false
}
// Verify parses a raw ID Token, verifies it's been signed by the provider, preforms
// any additional checks depending on the Config, and returns the payload.
//
// Verify does NOT do nonce validation, which is the callers responsibility.
//
// See: https://openid.net/specs/openid-connect-core-1_0.html#IDTokenValidation
//
// oauth2Token, err := oauth2Config.Exchange(ctx, r.URL.Query().Get("code"))
// if err != nil {
// // handle error
// }
//
// // Extract the ID Token from oauth2 token.
// rawIDToken, ok := oauth2Token.Extra("id_token").(string)
// if !ok {
// // handle error
// }
//
// token, err := verifier.Verify(ctx, rawIDToken)
//
func (v *IDTokenVerifier) Verify(ctx context.Context, rawIDToken string) (*IDToken, error) {
jws, err := jose.ParseSigned(rawIDToken)
if err != nil {
return nil, fmt.Errorf("oidc: malformed jwt: %v", err)
}
// Throw out tokens with invalid claims before trying to verify the token. This lets
// us do cheap checks before possibly re-syncing keys.
payload, err := parseJWT(rawIDToken)
if err != nil {
return nil, fmt.Errorf("oidc: malformed jwt: %v", err)
}
var token idToken
if err := json.Unmarshal(payload, &token); err != nil {
return nil, fmt.Errorf("oidc: failed to unmarshal claims: %v", err)
}
t := &IDToken{
Issuer: token.Issuer,
Subject: token.Subject,
Audience: []string(token.Audience),
Expiry: time.Time(token.Expiry),
IssuedAt: time.Time(token.IssuedAt),
Nonce: token.Nonce,
AccessTokenHash: token.AtHash,
claims: payload,
}
// Check issuer.
if t.Issuer != v.issuer {
// Google sometimes returns "accounts.google.com" as the issuer claim instead of
// the required "https://accounts.google.com". Detect this case and allow it only
// for Google.
//
// We will not add hooks to let other providers go off spec like this.
if !(v.issuer == issuerGoogleAccounts && t.Issuer == issuerGoogleAccountsNoScheme) {
return nil, fmt.Errorf("oidc: id token issued by a different provider, expected %q got %q", v.issuer, t.Issuer)
}
}
// If a client ID has been provided, make sure it's part of the audience. SkipClientIDCheck must be true if ClientID is empty.
//
// This check DOES NOT ensure that the ClientID is the party to which the ID Token was issued (i.e. Authorized party).
if !v.config.SkipClientIDCheck {
if v.config.ClientID != "" {
if !contains(t.Audience, v.config.ClientID) {
return nil, fmt.Errorf("oidc: expected audience %q got %q", v.config.ClientID, t.Audience)
}
} else {
return nil, fmt.Errorf("oidc: invalid configuration, clientID must be provided or SkipClientIDCheck must be set")
}
}
// If a SkipExpiryCheck is false, make sure token is not expired.
if !v.config.SkipExpiryCheck {
now := time.Now
if v.config.Now != nil {
now = v.config.Now
}
if t.Expiry.Before(now()) {
return nil, fmt.Errorf("oidc: token is expired (Token Expiry: %v)", t.Expiry)
}
}
switch len(jws.Signatures) {
case 0:
return nil, fmt.Errorf("oidc: id token not signed")
case 1:
default:
return nil, fmt.Errorf("oidc: multiple signatures on id token not supported")
}
sig := jws.Signatures[0]
supportedSigAlgs := v.config.SupportedSigningAlgs
if len(supportedSigAlgs) == 0 {
supportedSigAlgs = []string{RS256}
}
if !contains(supportedSigAlgs, sig.Header.Algorithm) {
return nil, fmt.Errorf("oidc: id token signed with unsupported algorithm, expected %q got %q", supportedSigAlgs, sig.Header.Algorithm)
}
t.sigAlgorithm = sig.Header.Algorithm
gotPayload, err := v.keySet.VerifySignature(ctx, rawIDToken)
if err != nil {
return nil, fmt.Errorf("failed to verify signature: %v", err)
}
// Ensure that the payload returned by the square actually matches the payload parsed earlier.
if !bytes.Equal(gotPayload, payload) {
return nil, errors.New("oidc: internal error, payload parsed did not match previous payload")
}
return t, nil
}
// Nonce returns an auth code option which requires the ID Token created by the
// OpenID Connect provider to contain the specified nonce.
func Nonce(nonce string) oauth2.AuthCodeOption {
return oauth2.SetAuthURLParam("nonce", nonce)
}