mirror of https://github.com/status-im/consul.git
359 lines
11 KiB
Go
359 lines
11 KiB
Go
// Copyright (c) HashiCorp, Inc.
|
|
// SPDX-License-Identifier: BUSL-1.1
|
|
|
|
package oidcauth
|
|
|
|
import (
|
|
"context"
|
|
"errors"
|
|
"fmt"
|
|
"net/url"
|
|
"strings"
|
|
"time"
|
|
|
|
"github.com/coreos/go-oidc"
|
|
)
|
|
|
|
const (
|
|
// TypeOIDC is the config type to specify if the OIDC authorization code
|
|
// workflow is desired. The Authenticator methods GetAuthCodeURL and
|
|
// ClaimsFromAuthCode are activated with the type.
|
|
TypeOIDC = "oidc"
|
|
|
|
// TypeJWT is the config type to specify if simple JWT decoding (via static
|
|
// keys, JWKS, and OIDC discovery) is desired. The Authenticator method
|
|
// ClaimsFromJWT is activated with this type.
|
|
TypeJWT = "jwt"
|
|
)
|
|
|
|
// Config is the collection of all settings that pertain to doing OIDC-based
|
|
// authentication and direct JWT-based authentication processes.
|
|
type Config struct {
|
|
// Type defines which kind of authentication will be happening, OIDC-based
|
|
// or JWT-based. Allowed values are either 'oidc' or 'jwt'.
|
|
//
|
|
// Defaults to 'oidc' if unset.
|
|
Type string
|
|
|
|
// -------
|
|
// common for type=oidc and type=jwt
|
|
// -------
|
|
|
|
// JWTSupportedAlgs is a list of supported signing algorithms. Defaults to
|
|
// RS256.
|
|
JWTSupportedAlgs []string
|
|
|
|
// Comma-separated list of 'aud' claims that are valid for login; any match
|
|
// is sufficient
|
|
// TODO(sso): actually just send these down as string claims?
|
|
BoundAudiences []string
|
|
|
|
// Mappings of claims (key) that will be copied to a metadata field
|
|
// (value). Use this if the claim you are capturing is singular (such as an
|
|
// attribute).
|
|
//
|
|
// When mapped, the values can be any of a number, string, or boolean and
|
|
// will all be stringified when returned.
|
|
ClaimMappings map[string]string
|
|
|
|
// Mappings of claims (key) that will be copied to a metadata field
|
|
// (value). Use this if the claim you are capturing is list-like (such as
|
|
// groups).
|
|
//
|
|
// When mapped, the values in each list can be any of a number, string, or
|
|
// boolean and will all be stringified when returned.
|
|
ListClaimMappings map[string]string
|
|
|
|
// OIDCDiscoveryURL is the OIDC Discovery URL, without any .well-known
|
|
// component (base path). Cannot be used with "JWKSURL" or
|
|
// "JWTValidationPubKeys".
|
|
OIDCDiscoveryURL string
|
|
|
|
// OIDCDiscoveryCACert is the CA certificate or chain of certificates, in
|
|
// PEM format, to use to validate connections to the OIDC Discovery URL. If
|
|
// not set, system certificates are used.
|
|
OIDCDiscoveryCACert string
|
|
|
|
// -------
|
|
// just for type=oidc
|
|
// -------
|
|
|
|
// OIDCClientID is the OAuth Client ID configured with your OIDC provider.
|
|
//
|
|
// Valid only if Type=oidc
|
|
OIDCClientID string
|
|
|
|
// The OAuth Client Secret configured with your OIDC provider.
|
|
//
|
|
// Valid only if Type=oidc
|
|
OIDCClientSecret string
|
|
|
|
// Comma-separated list of OIDC scopes
|
|
//
|
|
// Valid only if Type=oidc
|
|
OIDCScopes []string
|
|
|
|
// Space-separated list of OIDC Authorization Context Class Reference values
|
|
//
|
|
// Valid only if Type=oidc
|
|
OIDCACRValues []string
|
|
|
|
// Comma-separated list of allowed values for redirect_uri
|
|
//
|
|
// Valid only if Type=oidc
|
|
AllowedRedirectURIs []string
|
|
|
|
// Log received OIDC tokens and claims when debug-level logging is active.
|
|
// Not recommended in production since sensitive information may be present
|
|
// in OIDC responses.
|
|
//
|
|
// Valid only if Type=oidc
|
|
VerboseOIDCLogging bool
|
|
|
|
// -------
|
|
// just for type=jwt
|
|
// -------
|
|
|
|
// JWKSURL is the JWKS URL to use to authenticate signatures. Cannot be
|
|
// used with "OIDCDiscoveryURL" or "JWTValidationPubKeys".
|
|
//
|
|
// Valid only if Type=jwt
|
|
JWKSURL string
|
|
|
|
// JWKSCACert is the CA certificate or chain of certificates, in PEM
|
|
// format, to use to validate connections to the JWKS URL. If not set,
|
|
// system certificates are used.
|
|
//
|
|
// Valid only if Type=jwt
|
|
JWKSCACert string
|
|
|
|
// JWTValidationPubKeys is a list of PEM-encoded public keys to use to
|
|
// authenticate signatures locally. Cannot be used with "JWKSURL" or
|
|
// "OIDCDiscoveryURL".
|
|
//
|
|
// Valid only if Type=jwt
|
|
JWTValidationPubKeys []string
|
|
|
|
// BoundIssuer is the value against which to match the 'iss' claim in a
|
|
// JWT. Optional.
|
|
//
|
|
// Valid only if Type=jwt
|
|
BoundIssuer string
|
|
|
|
// Duration in seconds of leeway when validating expiration of
|
|
// a token to account for clock skew.
|
|
//
|
|
// Defaults to 150 (2.5 minutes) if set to 0 and can be disabled if set to -1.`,
|
|
//
|
|
// Valid only if Type=jwt
|
|
ExpirationLeeway time.Duration
|
|
|
|
// Duration in seconds of leeway when validating not before values of a
|
|
// token to account for clock skew.
|
|
//
|
|
// Defaults to 150 (2.5 minutes) if set to 0 and can be disabled if set to
|
|
// -1.`,
|
|
//
|
|
// Valid only if Type=jwt
|
|
NotBeforeLeeway time.Duration
|
|
|
|
// Duration in seconds of leeway when validating all claims to account for
|
|
// clock skew.
|
|
//
|
|
// Defaults to 60 (1 minute) if set to 0 and can be disabled if set to
|
|
// -1.`,
|
|
//
|
|
// Valid only if Type=jwt
|
|
ClockSkewLeeway time.Duration
|
|
}
|
|
|
|
// Validate returns an error if the config is not valid.
|
|
func (c *Config) Validate() error {
|
|
validateCtx, validateCtxCancel := context.WithCancel(context.Background())
|
|
defer validateCtxCancel()
|
|
|
|
switch c.Type {
|
|
case TypeOIDC, "":
|
|
// required
|
|
switch {
|
|
case c.OIDCDiscoveryURL == "":
|
|
return fmt.Errorf("'OIDCDiscoveryURL' must be set for type %q", c.Type)
|
|
case c.OIDCClientID == "":
|
|
return fmt.Errorf("'OIDCClientID' must be set for type %q", c.Type)
|
|
case c.OIDCClientSecret == "":
|
|
return fmt.Errorf("'OIDCClientSecret' must be set for type %q", c.Type)
|
|
case len(c.AllowedRedirectURIs) == 0:
|
|
return fmt.Errorf("'AllowedRedirectURIs' must be set for type %q", c.Type)
|
|
}
|
|
|
|
// not allowed
|
|
switch {
|
|
case c.JWKSURL != "":
|
|
return fmt.Errorf("'JWKSURL' must not be set for type %q", c.Type)
|
|
case c.JWKSCACert != "":
|
|
return fmt.Errorf("'JWKSCACert' must not be set for type %q", c.Type)
|
|
case len(c.JWTValidationPubKeys) != 0:
|
|
return fmt.Errorf("'JWTValidationPubKeys' must not be set for type %q", c.Type)
|
|
case c.BoundIssuer != "":
|
|
return fmt.Errorf("'BoundIssuer' must not be set for type %q", c.Type)
|
|
case c.ExpirationLeeway != 0:
|
|
return fmt.Errorf("'ExpirationLeeway' must not be set for type %q", c.Type)
|
|
case c.NotBeforeLeeway != 0:
|
|
return fmt.Errorf("'NotBeforeLeeway' must not be set for type %q", c.Type)
|
|
case c.ClockSkewLeeway != 0:
|
|
return fmt.Errorf("'ClockSkewLeeway' must not be set for type %q", c.Type)
|
|
}
|
|
|
|
var bad []string
|
|
for _, allowed := range c.AllowedRedirectURIs {
|
|
if _, err := url.Parse(allowed); err != nil {
|
|
bad = append(bad, allowed)
|
|
}
|
|
}
|
|
if len(bad) > 0 {
|
|
return fmt.Errorf("Invalid AllowedRedirectURIs provided: %v", bad)
|
|
}
|
|
|
|
case TypeJWT:
|
|
// not allowed
|
|
switch {
|
|
case c.OIDCClientID != "":
|
|
return fmt.Errorf("'OIDCClientID' must not be set for type %q", c.Type)
|
|
case c.OIDCClientSecret != "":
|
|
return fmt.Errorf("'OIDCClientSecret' must not be set for type %q", c.Type)
|
|
case len(c.OIDCScopes) != 0:
|
|
return fmt.Errorf("'OIDCScopes' must not be set for type %q", c.Type)
|
|
case len(c.OIDCACRValues) != 0:
|
|
return fmt.Errorf("'OIDCACRValues' must not be set for type %q", c.Type)
|
|
case len(c.AllowedRedirectURIs) != 0:
|
|
return fmt.Errorf("'AllowedRedirectURIs' must not be set for type %q", c.Type)
|
|
case c.VerboseOIDCLogging:
|
|
return fmt.Errorf("'VerboseOIDCLogging' must not be set for type %q", c.Type)
|
|
}
|
|
|
|
methodCount := 0
|
|
if c.OIDCDiscoveryURL != "" {
|
|
methodCount++
|
|
}
|
|
if len(c.JWTValidationPubKeys) != 0 {
|
|
methodCount++
|
|
}
|
|
if c.JWKSURL != "" {
|
|
methodCount++
|
|
}
|
|
|
|
if methodCount != 1 {
|
|
return fmt.Errorf("exactly one of 'JWTValidationPubKeys', 'JWKSURL', or 'OIDCDiscoveryURL' must be set for type %q", c.Type)
|
|
}
|
|
|
|
if c.JWKSURL != "" {
|
|
httpClient, err := createHTTPClient(c.JWKSCACert)
|
|
if err != nil {
|
|
return fmt.Errorf("error checking JWKSCACert: %v", err)
|
|
}
|
|
|
|
ctx := contextWithHttpClient(validateCtx, httpClient)
|
|
keyset := oidc.NewRemoteKeySet(ctx, c.JWKSURL)
|
|
|
|
// Try to verify a correctly formatted JWT. The signature will fail
|
|
// to match, but other errors with fetching the remote keyset
|
|
// should be reported.
|
|
_, err = keyset.VerifySignature(ctx, testJWT)
|
|
if err == nil {
|
|
err = errors.New("unexpected verification of JWT")
|
|
}
|
|
|
|
if !strings.Contains(err.Error(), "failed to verify id token signature") {
|
|
return fmt.Errorf("error checking JWKSURL: %v", err)
|
|
}
|
|
} else if c.JWKSCACert != "" {
|
|
return fmt.Errorf("'JWKSCACert' should not be set unless 'JWKSURL' is set")
|
|
}
|
|
|
|
if len(c.JWTValidationPubKeys) != 0 {
|
|
for i, v := range c.JWTValidationPubKeys {
|
|
if _, err := parsePublicKeyPEM([]byte(v)); err != nil {
|
|
return fmt.Errorf("error parsing public key JWTValidationPubKeys[%d]: %v", i, err)
|
|
}
|
|
}
|
|
}
|
|
|
|
default:
|
|
return fmt.Errorf("authenticator type should be %q or %q", TypeOIDC, TypeJWT)
|
|
}
|
|
|
|
if c.OIDCDiscoveryURL != "" {
|
|
httpClient, err := createHTTPClient(c.OIDCDiscoveryCACert)
|
|
if err != nil {
|
|
return fmt.Errorf("error checking OIDCDiscoveryCACert: %v", err)
|
|
}
|
|
|
|
ctx := contextWithHttpClient(validateCtx, httpClient)
|
|
if _, err := oidc.NewProvider(ctx, c.OIDCDiscoveryURL); err != nil {
|
|
return fmt.Errorf("error checking OIDCDiscoveryURL: %v", err)
|
|
}
|
|
} else if c.OIDCDiscoveryCACert != "" {
|
|
return fmt.Errorf("'OIDCDiscoveryCACert' should not be set unless 'OIDCDiscoveryURL' is set")
|
|
}
|
|
|
|
for _, a := range c.JWTSupportedAlgs {
|
|
switch a {
|
|
case oidc.RS256, oidc.RS384, oidc.RS512,
|
|
oidc.ES256, oidc.ES384, oidc.ES512,
|
|
oidc.PS256, oidc.PS384, oidc.PS512:
|
|
default:
|
|
return fmt.Errorf("Invalid supported algorithm: %s", a)
|
|
}
|
|
}
|
|
|
|
if len(c.ClaimMappings) > 0 {
|
|
targets := make(map[string]bool)
|
|
for _, mappedKey := range c.ClaimMappings {
|
|
if targets[mappedKey] {
|
|
return fmt.Errorf("ClaimMappings contains multiple mappings for key %q", mappedKey)
|
|
}
|
|
targets[mappedKey] = true
|
|
}
|
|
}
|
|
|
|
if len(c.ListClaimMappings) > 0 {
|
|
targets := make(map[string]bool)
|
|
for _, mappedKey := range c.ListClaimMappings {
|
|
if targets[mappedKey] {
|
|
return fmt.Errorf("ListClaimMappings contains multiple mappings for key %q", mappedKey)
|
|
}
|
|
targets[mappedKey] = true
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
const (
|
|
authUnconfigured = iota
|
|
authStaticKeys
|
|
authJWKS
|
|
authOIDCDiscovery
|
|
authOIDCFlow
|
|
)
|
|
|
|
// authType classifies the authorization type/flow based on config parameters.
|
|
// It is only valid to invoke if Validate() returns a nil error.
|
|
func (c *Config) authType() int {
|
|
switch {
|
|
case len(c.JWTValidationPubKeys) > 0:
|
|
return authStaticKeys
|
|
case c.JWKSURL != "":
|
|
return authJWKS
|
|
case c.OIDCDiscoveryURL != "":
|
|
if c.OIDCClientID != "" && c.OIDCClientSecret != "" {
|
|
return authOIDCFlow
|
|
}
|
|
return authOIDCDiscovery
|
|
default:
|
|
return authUnconfigured
|
|
}
|
|
}
|
|
|
|
const testJWT = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.e30.Hf3E3iCHzqC5QIQ0nCqS1kw78IiQTRVzsLTuKoDIpdk"
|