-
Notifications
You must be signed in to change notification settings - Fork 2
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
- Loading branch information
Showing
1 changed file
with
214 additions
and
0 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,214 @@ | ||
package oidc | ||
|
||
import ( | ||
"context" | ||
"fmt" | ||
"net/http" | ||
"strconv" | ||
"strings" | ||
"time" | ||
|
||
"github.com/0xsequence/ethkit/go-ethereum/common/hexutil" | ||
ethcrypto "github.com/0xsequence/ethkit/go-ethereum/crypto" | ||
"github.com/0xsequence/go-sequence/intents" | ||
"github.com/0xsequence/waas-authenticator/proto" | ||
"github.com/0xsequence/waas-authenticator/rpc/auth" | ||
"github.com/0xsequence/waas-authenticator/rpc/tenant" | ||
"github.com/0xsequence/waas-authenticator/rpc/tracing" | ||
"github.com/goware/cachestore" | ||
"github.com/goware/cachestore/cachestorectl" | ||
"github.com/lestrrat-go/jwx/v2/jwk" | ||
"github.com/lestrrat-go/jwx/v2/jws" | ||
"github.com/lestrrat-go/jwx/v2/jwt" | ||
"golang.org/x/sync/errgroup" | ||
) | ||
|
||
type AuthProvider struct { | ||
client HTTPClient | ||
store cachestore.Store[jwk.Key] | ||
} | ||
|
||
func NewAuthProvider(cacheBackend cachestore.Backend, client HTTPClient) (auth.Provider, error) { | ||
if client == nil { | ||
client = http.DefaultClient | ||
} | ||
store, err := cachestorectl.Open[jwk.Key](cacheBackend) | ||
if err != nil { | ||
return nil, err | ||
} | ||
return &AuthProvider{ | ||
client: client, | ||
store: store, | ||
}, nil | ||
} | ||
|
||
func (v *AuthProvider) InitiateAuth( | ||
ctx context.Context, | ||
verifCtx *proto.VerificationContext, | ||
verifier string, | ||
intent *intents.Intent, | ||
storeFn auth.StoreVerificationContextFn, | ||
) (*intents.IntentResponseAuthInitiated, error) { | ||
tnt := tenant.FromContext(ctx) | ||
|
||
if verifCtx != nil { | ||
return nil, fmt.Errorf("cannot reuse an old ID token") | ||
} | ||
|
||
_, expiresAt, err := v.extractVerifier(verifier) | ||
if err != nil { | ||
return nil, err | ||
} | ||
|
||
if time.Now().After(expiresAt) { | ||
return nil, fmt.Errorf("token expired") | ||
} | ||
|
||
verifCtx = &proto.VerificationContext{ | ||
ProjectID: tnt.ProjectID, | ||
SessionID: intent.Signers()[0], | ||
IdentityType: proto.IdentityType_OIDC, | ||
Verifier: verifier, | ||
ExpiresAt: expiresAt, | ||
} | ||
|
||
if err := storeFn(ctx, verifCtx); err != nil { | ||
return nil, err | ||
} | ||
|
||
res := &intents.IntentResponseAuthInitiated{ | ||
SessionID: verifCtx.SessionID, | ||
IdentityType: intents.IdentityType_Email, | ||
ExpiresIn: int(verifCtx.ExpiresAt.Sub(time.Now()).Seconds()), | ||
} | ||
return res, nil | ||
} | ||
|
||
func (v *AuthProvider) Verify(ctx context.Context, verifCtx *proto.VerificationContext, sessionID string, answer string) (ident proto.Identity, err error) { | ||
ctx, span := tracing.Span(ctx, "AuthProvider.Verify") | ||
defer func() { | ||
if err != nil { | ||
span.RecordError(err) | ||
} | ||
span.End() | ||
}() | ||
|
||
if verifCtx == nil { | ||
return proto.Identity{}, fmt.Errorf("auth session not found") | ||
} | ||
|
||
tokHash, expiresAt, err := v.extractVerifier(verifCtx.Verifier) | ||
if err != nil { | ||
return proto.Identity{}, err | ||
} | ||
|
||
tok, err := jwt.Parse([]byte(answer), jwt.WithVerify(false), jwt.WithValidate(false)) | ||
if err != nil { | ||
return proto.Identity{}, fmt.Errorf("parse JWT: %w", err) | ||
} | ||
|
||
issuer := normalizeIssuer(tok.Issuer()) | ||
idp := getOIDCProvider(ctx, issuer) | ||
if idp == nil { | ||
return proto.Identity{}, fmt.Errorf("issuer %q not valid for this tenant", issuer) | ||
} | ||
|
||
expectedHash := hexutil.Encode(ethcrypto.Keccak256([]byte(answer))) | ||
if tokHash != expectedHash { | ||
return proto.Identity{}, fmt.Errorf("invalid token hash") | ||
} | ||
|
||
if !tok.Expiration().Equal(expiresAt) { | ||
return proto.Identity{}, fmt.Errorf("invalid exp claim") | ||
} | ||
|
||
ks := &operationKeySet{ | ||
ctx: ctx, | ||
iss: issuer, | ||
store: v.store, | ||
getKeySet: v.GetKeySet, | ||
} | ||
|
||
if _, err := jws.Verify([]byte(answer), jws.WithKeySet(ks, jws.WithMultipleKeysPerKeyID(false))); err != nil { | ||
return proto.Identity{}, fmt.Errorf("signature verification: %w", err) | ||
} | ||
|
||
validateOptions := []jwt.ValidateOption{ | ||
jwt.WithValidator(withIssuer(idp.Issuer)), | ||
jwt.WithAcceptableSkew(10 * time.Second), | ||
jwt.WithValidator(withAudience(idp.Audience)), | ||
} | ||
|
||
if err := jwt.Validate(tok, validateOptions...); err != nil { | ||
return proto.Identity{}, fmt.Errorf("JWT validation: %w", err) | ||
} | ||
|
||
identity := proto.Identity{ | ||
Type: proto.IdentityType_OIDC, | ||
Issuer: issuer, | ||
Subject: tok.Subject(), | ||
Email: getEmailFromToken(tok), | ||
} | ||
return identity, nil | ||
} | ||
|
||
func (v *AuthProvider) ValidateTenant(ctx context.Context, tenant *proto.TenantData) error { | ||
var wg errgroup.Group | ||
ctx, cancel := context.WithCancel(ctx) | ||
defer cancel() | ||
|
||
for i, provider := range tenant.OIDCProviders { | ||
provider := provider | ||
|
||
if provider.Issuer == "" { | ||
return fmt.Errorf("provider %d: empty issuer", i) | ||
} | ||
|
||
if len(provider.Audience) < 1 { | ||
return fmt.Errorf("provider %d: at least one audience is required", i) | ||
} | ||
|
||
wg.Go(func() error { | ||
if _, err := v.GetKeySet(ctx, provider.Issuer); err != nil { | ||
return err | ||
} | ||
return nil | ||
}) | ||
} | ||
|
||
return wg.Wait() | ||
} | ||
|
||
func (v *AuthProvider) GetKeySet(ctx context.Context, issuer string) (set jwk.Set, err error) { | ||
ctx, span := tracing.Span(ctx, "AuthProvider.GetKeySet") | ||
defer func() { | ||
if err != nil { | ||
span.RecordError(err) | ||
} | ||
span.End() | ||
}() | ||
|
||
jwksURL, err := fetchJWKSURL(ctx, v.client, issuer) | ||
if err != nil { | ||
return nil, fmt.Errorf("fetch issuer keys: %w", err) | ||
} | ||
|
||
keySet, err := jwk.Fetch(ctx, jwksURL, jwk.WithHTTPClient(tracing.WrapClientWithContext(ctx, v.client))) | ||
if err != nil { | ||
return nil, fmt.Errorf("fetch issuer keys: %w", err) | ||
} | ||
return keySet, nil | ||
} | ||
|
||
func (v *AuthProvider) extractVerifier(verifier string) (tokHash string, expiresAt time.Time, err error) { | ||
parts := strings.SplitN(verifier, ";", 2) | ||
|
||
tokHash = parts[0] | ||
exp, err := strconv.ParseInt(parts[1], 10, 64) | ||
if err != nil { | ||
return "", time.Time{}, fmt.Errorf("parse exp: %w", err) | ||
} | ||
expiresAt = time.Unix(exp, 0) | ||
|
||
return tokHash, expiresAt, nil | ||
} |