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Improve access and dpop token validation

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pull/1681/head
Herman Slatman 5 months ago
parent 17578b57f2
commit 0f0f060149
No known key found for this signature in database
GPG Key ID: F4D8A44EA0A75A4F
3 changed files with 87 additions and 5 deletions
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70
acme/challenge.go
Unescape Escape View File

@ -562,6 +562,12 @@ type wireAccessToken struct {
Scope string `json:"scope"`
}
type wireDpopJwt struct {
jose.Claims
ClientID string `json:"client_id"`
Challenge string `json:"chal"`
}
type wireDpopToken map[string]any
type wireVerifyParams struct {
@ -581,6 +587,23 @@ func parseAndVerifyWireAccessToken(v wireVerifyParams) (*wireAccessToken, *wireD
return nil, nil, fmt.Errorf("failed parsing token: %w", err)
}
if len(jwt.Headers) != 1 {
return nil, nil, fmt.Errorf("token has wrong number of headers %d", len(jwt.Headers))
}
keyID, err := KeyToID(&jose.JSONWebKey{Key: v.tokenKey})
if err != nil {
return nil, nil, fmt.Errorf("failed calculating token key ID: %w", err)
}
jwtKeyID := jwt.Headers[0].KeyID
if jwtKeyID == "" {
if jwtKeyID, err = KeyToID(jwt.Headers[0].JSONWebKey); err != nil {
return nil, nil, fmt.Errorf("failed extracting token key ID: %w", err)
}
}
if jwtKeyID != keyID {
return nil, nil, fmt.Errorf("invalid token key ID %q", jwtKeyID)
}
var accessToken wireAccessToken
if err = jwt.Claims(v.tokenKey, &accessToken); err != nil {
return nil, nil, fmt.Errorf("failed validating Wire DPoP token claims: %w", err)
@ -589,10 +612,13 @@ func parseAndVerifyWireAccessToken(v wireVerifyParams) (*wireAccessToken, *wireD
if err := accessToken.ValidateWithLeeway(jose.Expected{
Time: v.t,
Issuer: v.issuer,
}, 360*time.Second); err != nil {
}, 1*time.Minute); err != nil {
return nil, nil, fmt.Errorf("failed validation: %w", err)
}
if accessToken.Challenge == "" {
return nil, nil, errors.New("access token challenge must not be empty")
}
if accessToken.Cnf.Kid != v.dpopKeyID {
return nil, nil, fmt.Errorf("expected kid %q; got %q", v.dpopKeyID, accessToken.Cnf.Kid)
}
@ -602,11 +628,49 @@ func parseAndVerifyWireAccessToken(v wireVerifyParams) (*wireAccessToken, *wireD
if accessToken.Expiry.Time().After(v.t.Add(time.Hour * 24 * 365)) {
return nil, nil, fmt.Errorf("'exp' %s is too far into the future", accessToken.Expiry.Time().String())
}
if accessToken.Scope != "wire_client_id" {
return nil, nil, fmt.Errorf("invalid Wire scope %q", accessToken.Scope)
}
dpopJWT, err := jose.ParseSigned(accessToken.Proof)
if err != nil {
return nil, nil, fmt.Errorf("invalid Wire DPoP token: %w", err)
}
if len(dpopJWT.Headers) != 1 {
return nil, nil, fmt.Errorf("DPoP token has wrong number of headers %d", len(jwt.Headers))
}
dpopJwtKeyID := dpopJWT.Headers[0].KeyID
if dpopJwtKeyID == "" {
if dpopJwtKeyID, err = KeyToID(dpopJWT.Headers[0].JSONWebKey); err != nil {
return nil, nil, fmt.Errorf("failed extracting DPoP token key ID: %w", err)
}
}
if dpopJwtKeyID != v.dpopKeyID {
return nil, nil, fmt.Errorf("invalid DPoP token key ID %q", dpopJWT.Headers[0].KeyID)
}
var wireDpop wireDpopJwt
if err := dpopJWT.Claims(v.dpopKey, &wireDpop); err != nil {
return nil, nil, fmt.Errorf("failed validating Wire DPoP token claims: %w", err)
}
if err := wireDpop.ValidateWithLeeway(jose.Expected{
Time: v.t,
Issuer: v.issuer,
}, 1*time.Minute); err != nil {
return nil, nil, fmt.Errorf("failed DPoP validation: %w", err)
}
if wireDpop.Expiry.Time().After(v.t.Add(time.Hour * 24 * 365)) {
return nil, nil, fmt.Errorf("'exp' %s is too far into the future", wireDpop.Expiry.Time().String())
}
if wireDpop.ClientID != v.wireID.ClientID {
return nil, nil, fmt.Errorf("DPoP contains invalid Wire client ID %q", wireDpop.ClientID)
}
if wireDpop.Challenge != accessToken.Challenge {
return nil, nil, fmt.Errorf("DPoP contains invalid challenge %q", wireDpop.Challenge)
}
// TODO(hs): can we use the wireDpopJwt and map that instead of doing Claims() twice?
var dpopToken wireDpopToken
if err := dpopJWT.Claims(v.dpopKey, &dpopToken); err != nil {
return nil, nil, fmt.Errorf("failed validating Wire DPoP token claims: %w", err)
@ -616,7 +680,7 @@ func parseAndVerifyWireAccessToken(v wireVerifyParams) (*wireAccessToken, *wireD
if !ok {
return nil, nil, fmt.Errorf("invalid challenge in Wire DPoP token")
}
if challenge != v.chToken {
if challenge == "" || challenge != v.chToken {
return nil, nil, fmt.Errorf("invalid Wire DPoP challenge %q", challenge)
}
@ -624,7 +688,7 @@ func parseAndVerifyWireAccessToken(v wireVerifyParams) (*wireAccessToken, *wireD
if !ok {
return nil, nil, fmt.Errorf("invalid handle in Wire DPoP token")
}
if handle != v.wireID.Handle {
if handle == "" || handle != v.wireID.Handle {
return nil, nil, fmt.Errorf("invalid Wire client handle %q", handle)
}

2
acme/challenge_test.go
Unescape Escape View File

@ -1007,12 +1007,14 @@ MCowBQYDK2VwAyEA5c+4NKZSNQcR1T8qN6SjwgdPZQ0Ge12Ylx/YeGAJ35k=
jose.Claims
Challenge string `json:"chal,omitempty"`
Handle string `json:"handle,omitempty"`
ClientID string `json:"client_id,omitempty"`
}{
Claims: jose.Claims{
Subject: "wireapp://CzbfFjDOQrenCbDxVmgnFw!594930e9d50bb175@wire.com",
},
Challenge: "token",
Handle: "wireapp://%40alice_wire@wire.com",
ClientID: "wireapp://CzbfFjDOQrenCbDxVmgnFw!594930e9d50bb175@wire.com",
})
require.NoError(t, err)
dpop, err := dpopSigner.Sign(dpopBytes)

20
acme/challenge_wire_test.go
Unescape Escape View File

@ -3,6 +3,7 @@ package acme
import (
"context"
"crypto"
"crypto/ed25519"
"encoding/base64"
"encoding/json"
"encoding/pem"
@ -248,12 +249,14 @@ MCowBQYDK2VwAyEA5c+4NKZSNQcR1T8qN6SjwgdPZQ0Ge12Ylx/YeGAJ35k=
jose.Claims
Challenge string `json:"chal,omitempty"`
Handle string `json:"handle,omitempty"`
ClientID string `json:"client_id,omitempty"`
}{
Claims: jose.Claims{
Subject: "wireapp://CzbfFjDOQrenCbDxVmgnFw!594930e9d50bb175@wire.com",
},
Challenge: "token",
Handle: "wireapp://%40alice_wire@wire.com",
ClientID: "wireapp://CzbfFjDOQrenCbDxVmgnFw!594930e9d50bb175@wire.com",
})
require.NoError(t, err)
dpop, err := dpopSigner.Sign(dpopBytes)
@ -382,12 +385,14 @@ MCowBQYDK2VwAyEA5c+4NKZSNQcR1T8qN6SjwgdPZQ0Ge12Ylx/YeGAJ35k=
jose.Claims
Challenge string `json:"chal,omitempty"`
Handle string `json:"handle,omitempty"`
ClientID string `json:"client_id,omitempty"`
}{
Claims: jose.Claims{
Subject: "wireapp://CzbfFjDOQrenCbDxVmgnFw!594930e9d50bb175@wire.com",
},
Challenge: "token",
Handle: "wireapp://%40alice_wire@wire.com",
ClientID: "wireapp://CzbfFjDOQrenCbDxVmgnFw!594930e9d50bb175@wire.com",
})
require.NoError(t, err)
dpop, err := dpopSigner.Sign(dpopBytes)
@ -449,7 +454,7 @@ MCowBQYDK2VwAyEA5c+4NKZSNQcR1T8qN6SjwgdPZQ0Ge12Ylx/YeGAJ35k=
Wire: &wireprovisioner.Options{
OIDC: &wireprovisioner.OIDCOptions{
Provider: &wireprovisioner.Provider{
IssuerURL: "http://issuerexample.com",
IssuerURL: "http://issuer.example.com",
},
Config: &wireprovisioner.Config{
ClientID: "test",
@ -524,12 +529,14 @@ MCowBQYDK2VwAyEA5c+4NKZSNQcR1T8qN6SjwgdPZQ0Ge12Ylx/YeGAJ35k=
jose.Claims
Challenge string `json:"chal,omitempty"`
Handle string `json:"handle,omitempty"`
ClientID string `json:"client_id,omitempty"`
}{
Claims: jose.Claims{
Subject: "wireapp://CzbfFjDOQrenCbDxVmgnFw!594930e9d50bb175@wire.com",
},
Challenge: "token",
Handle: "wireapp://%40alice_wire@wire.com",
ClientID: "wireapp://CzbfFjDOQrenCbDxVmgnFw!594930e9d50bb175@wire.com",
})
require.NoError(t, err)
dpop, err := dpopSigner.Sign(dpopBytes)
@ -666,12 +673,14 @@ MCowBQYDK2VwAyEA5c+4NKZSNQcR1T8qN6SjwgdPZQ0Ge12Ylx/YeGAJ35k=
jose.Claims
Challenge string `json:"chal,omitempty"`
Handle string `json:"handle,omitempty"`
ClientID string `json:"client_id,omitempty"`
}{
Claims: jose.Claims{
Subject: "wireapp://CzbfFjDOQrenCbDxVmgnFw!594930e9d50bb175@wire.com",
},
Challenge: "token",
Handle: "wireapp://%40alice_wire@wire.com",
ClientID: "wireapp://CzbfFjDOQrenCbDxVmgnFw!594930e9d50bb175@wire.com",
})
require.NoError(t, err)
dpop, err := dpopSigner.Sign(dpopBytes)
@ -815,12 +824,14 @@ MCowBQYDK2VwAyEA5c+4NKZSNQcR1T8qN6SjwgdPZQ0Ge12Ylx/YeGAJ35k=
jose.Claims
Challenge string `json:"chal,omitempty"`
Handle string `json:"handle,omitempty"`
ClientID string `json:"client_id,omitempty"`
}{
Claims: jose.Claims{
Subject: "wireapp://CzbfFjDOQrenCbDxVmgnFw!594930e9d50bb175@wire.com",
},
Challenge: "token",
Handle: "wireapp://%40alice_wire@wire.com",
ClientID: "wireapp://CzbfFjDOQrenCbDxVmgnFw!594930e9d50bb175@wire.com",
})
require.NoError(t, err)
dpop, err := dpopSigner.Sign(dpopBytes)
@ -1920,12 +1931,16 @@ MCowBQYDK2VwAyEA5c+4NKZSNQcR1T8qN6SjwgdPZQ0Ge12Ylx/YeGAJ35k=
}
func Test_parseAndVerifyWireAccessToken(t *testing.T) {
t.Skip("skip this until capturing a new e2e flow with proper values")
key := `
-----BEGIN PUBLIC KEY-----
MCowBQYDK2VwAyEAB2IYqBWXAouDt3WcCZgCM3t9gumMEKMlgMsGenSu+fA=
-----END PUBLIC KEY-----`
publicKey, err := pemutil.Parse([]byte(key))
require.NoError(t, err)
pk, ok := publicKey.(ed25519.PublicKey)
require.True(t, ok)
issuer := "http://wire.com:19983/clients/7a41cf5b79683410/access-token"
wireID := wire.ID{
ClientID: "wireapp://guVX5xeFS3eTatmXBIyA4A!7a41cf5b79683410@wire.com",
@ -1951,7 +1966,7 @@ MCowBQYDK2VwAyEAB2IYqBWXAouDt3WcCZgCM3t9gumMEKMlgMsGenSu+fA=
at, dpop, err := parseAndVerifyWireAccessToken(wireVerifyParams{
token: token,
tokenKey: publicKey,
tokenKey: pk,
dpopKey: accountJWK.Public(),
dpopKeyID: accountJWK.KeyID,
issuer: issuer,
@ -1959,6 +1974,7 @@ MCowBQYDK2VwAyEAB2IYqBWXAouDt3WcCZgCM3t9gumMEKMlgMsGenSu+fA=
chToken: ch.Token,
t: issuedAt.Add(1 * time.Minute), // set validation time to be one minute after issuance
})
if assert.NoError(t, err) {
// token assertions
assert.Equal(t, "42c46d4c-e510-4175-9fb5-d055e125a49d", at.ID)

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