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-rw-r--r--pkg/dns/dns.go40
-rw-r--r--pkg/instance/endpoint.go2
-rw-r--r--pkg/instance/endpoint_test.go48
-rw-r--r--pkg/instance/instance.go10
-rw-r--r--pkg/mocks/sigsum_dns.go49
5 files changed, 131 insertions, 18 deletions
diff --git a/pkg/dns/dns.go b/pkg/dns/dns.go
new file mode 100644
index 0000000..7979119
--- /dev/null
+++ b/pkg/dns/dns.go
@@ -0,0 +1,40 @@
+package dns
+
+import (
+ "context"
+ "fmt"
+ "net"
+
+ "encoding/hex"
+
+ "git.sigsum.org/sigsum-log-go/pkg/types"
+)
+
+// Verifier can verify that a domain name is aware of a public key
+type Verifier interface {
+ Verify(ctx context.Context, name string, key *[types.VerificationKeySize]byte) error
+}
+
+// DefaultResolver implements the Verifier interface with Go's default resolver
+type DefaultResolver struct {
+ resolver net.Resolver
+}
+
+func NewDefaultResolver() Verifier {
+ return &DefaultResolver{}
+}
+
+func (dr *DefaultResolver) Verify(ctx context.Context, name string, key *[types.VerificationKeySize]byte) error {
+ rsp, err := dr.resolver.LookupTXT(ctx, name)
+ if err != nil {
+ return fmt.Errorf("domain name look-up failed: %v", err)
+ }
+
+ want := hex.EncodeToString(types.Hash(key[:])[:])
+ for _, got := range rsp {
+ if got == want {
+ return nil
+ }
+ }
+ return fmt.Errorf("%q is not aware of key hash %q", name, want)
+}
diff --git a/pkg/instance/endpoint.go b/pkg/instance/endpoint.go
index 2387263..a6d424d 100644
--- a/pkg/instance/endpoint.go
+++ b/pkg/instance/endpoint.go
@@ -9,7 +9,7 @@ import (
func addLeaf(ctx context.Context, i *Instance, w http.ResponseWriter, r *http.Request) (int, error) {
glog.V(3).Info("handling add-entry request")
- req, err := i.leafRequestFromHTTP(r)
+ req, err := i.leafRequestFromHTTP(ctx, r)
if err != nil {
return http.StatusBadRequest, err
}
diff --git a/pkg/instance/endpoint_test.go b/pkg/instance/endpoint_test.go
index 3ca72b2..29d5a8e 100644
--- a/pkg/instance/endpoint_test.go
+++ b/pkg/instance/endpoint_test.go
@@ -10,9 +10,9 @@ import (
"net/http/httptest"
"testing"
- "github.com/golang/mock/gomock"
"git.sigsum.org/sigsum-log-go/pkg/mocks"
"git.sigsum.org/sigsum-log-go/pkg/types"
+ "github.com/golang/mock/gomock"
)
var (
@@ -72,11 +72,13 @@ func TestAddLeaf(t *testing.T) {
))
}
for _, table := range []struct {
- description string
- ascii io.Reader // buffer used to populate HTTP request
- expect bool // set if a mock answer is expected
- err error // error from Trillian client
- wantCode int // HTTP status ok
+ description string
+ ascii io.Reader // buffer used to populate HTTP request
+ expectTrillian bool // expect Trillian client code path
+ errTrillian error // error from Trillian client
+ expectDNS bool // expect DNS verifier code path
+ errDNS error // error from DNS verifier
+ wantCode int // HTTP status ok
}{
// XXX introduce helper so that test params are not hardcoded
{
@@ -103,7 +105,7 @@ func TestAddLeaf(t *testing.T) {
wantCode: http.StatusBadRequest,
},
{
- description: "invalid: bad request (shard hint is before shard start)",
+ description: "invalid: bad request (shard hint is after shard end)",
ascii: buf(21,
"0000000000000000000000000000000000000000000000000000000000000000",
"79c14f0ad9ab24ab98fe9d5ff59c3b91348789758aa092c6bfab2ac8890b41fb1d44d985e723184f9de42edb82b5ada14f494a96e361914d5366dd92379a1d04",
@@ -112,15 +114,27 @@ func TestAddLeaf(t *testing.T) {
wantCode: http.StatusBadRequest,
},
{
+ description: "invalid: failed verifying domain hint",
+ ascii: buf(10,
+ "0000000000000000000000000000000000000000000000000000000000000000",
+ "7df253d2578c6c20b90832245ad6f981077454667796b3d507336a89ee878a2eae6b96e6d8de84fe8c1acf4b3aaffd482b657b65d94ed5e6be6320492147f90c",
+ "f6eef8e94ddf1396682871257e670a1d9b627cf460daade7c36d218b2866befb",
+ ),
+ expectDNS: true,
+ errDNS: fmt.Errorf("something went wrong"),
+ wantCode: http.StatusBadRequest,
+ },
+ {
description: "invalid: backend failure",
ascii: buf(10,
"0000000000000000000000000000000000000000000000000000000000000000",
"7df253d2578c6c20b90832245ad6f981077454667796b3d507336a89ee878a2eae6b96e6d8de84fe8c1acf4b3aaffd482b657b65d94ed5e6be6320492147f90c",
"f6eef8e94ddf1396682871257e670a1d9b627cf460daade7c36d218b2866befb",
),
- expect: true,
- err: fmt.Errorf("something went wrong"),
- wantCode: http.StatusInternalServerError,
+ expectDNS: true,
+ expectTrillian: true,
+ errTrillian: fmt.Errorf("something went wrong"),
+ wantCode: http.StatusInternalServerError,
},
{
description: "valid",
@@ -129,21 +143,27 @@ func TestAddLeaf(t *testing.T) {
"7df253d2578c6c20b90832245ad6f981077454667796b3d507336a89ee878a2eae6b96e6d8de84fe8c1acf4b3aaffd482b657b65d94ed5e6be6320492147f90c",
"f6eef8e94ddf1396682871257e670a1d9b627cf460daade7c36d218b2866befb",
),
- expect: true,
- wantCode: http.StatusOK,
+ expectDNS: true,
+ expectTrillian: true,
+ wantCode: http.StatusOK,
},
} {
// Run deferred functions at the end of each iteration
func() {
ctrl := gomock.NewController(t)
defer ctrl.Finish()
+ dns := mocks.NewMockVerifier(ctrl)
+ if table.expectDNS {
+ dns.EXPECT().Verify(gomock.Any(), gomock.Any(), gomock.Any()).Return(table.errDNS)
+ }
client := mocks.NewMockClient(ctrl)
- if table.expect {
- client.EXPECT().AddLeaf(gomock.Any(), gomock.Any()).Return(table.err)
+ if table.expectTrillian {
+ client.EXPECT().AddLeaf(gomock.Any(), gomock.Any()).Return(table.errTrillian)
}
i := Instance{
Config: testConfig,
Client: client,
+ DNS: dns,
}
// Create HTTP request
diff --git a/pkg/instance/instance.go b/pkg/instance/instance.go
index 31a9b73..fbfe4df 100644
--- a/pkg/instance/instance.go
+++ b/pkg/instance/instance.go
@@ -8,10 +8,11 @@ import (
"net/http"
"time"
- "github.com/golang/glog"
+ "git.sigsum.org/sigsum-log-go/pkg/dns"
"git.sigsum.org/sigsum-log-go/pkg/state"
"git.sigsum.org/sigsum-log-go/pkg/trillian"
"git.sigsum.org/sigsum-log-go/pkg/types"
+ "github.com/golang/glog"
)
// Config is a collection of log parameters
@@ -35,6 +36,7 @@ type Instance struct {
Client trillian.Client // provides access to the Trillian backend
Signer crypto.Signer // provides access to Ed25519 private key
Stateman state.StateManager // coordinates access to (co)signed tree heads
+ DNS dns.Verifier // checks if domain name knows a public key
}
// Handler implements the http.Handler interface, and contains a reference
@@ -92,7 +94,7 @@ func (a Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
}
}
-func (i *Instance) leafRequestFromHTTP(r *http.Request) (*types.LeafRequest, error) {
+func (i *Instance) leafRequestFromHTTP(ctx context.Context, r *http.Request) (*types.LeafRequest, error) {
var req types.LeafRequest
if err := req.UnmarshalASCII(r.Body); err != nil {
return nil, fmt.Errorf("UnmarshalASCII: %v", err)
@@ -110,7 +112,9 @@ func (i *Instance) leafRequestFromHTTP(r *http.Request) (*types.LeafRequest, err
if req.ShardHint > i.ShardEnd {
return nil, fmt.Errorf("invalid shard hint: %d not in [%d, %d]", req.ShardHint, i.ShardStart, i.ShardEnd)
}
- // TODO: check domain hint
+ if err := i.DNS.Verify(ctx, req.DomainHint, req.VerificationKey); err != nil {
+ return nil, fmt.Errorf("invalid domain hint: %v", err)
+ }
return &req, nil
}
diff --git a/pkg/mocks/sigsum_dns.go b/pkg/mocks/sigsum_dns.go
new file mode 100644
index 0000000..ede237e
--- /dev/null
+++ b/pkg/mocks/sigsum_dns.go
@@ -0,0 +1,49 @@
+// Code generated by MockGen. DO NOT EDIT.
+// Source: git.sigsum.org/sigsum-log-go/pkg/dns (interfaces: Verifier)
+
+// Package mocks is a generated GoMock package.
+package mocks
+
+import (
+ context "context"
+ reflect "reflect"
+
+ gomock "github.com/golang/mock/gomock"
+)
+
+// MockVerifier is a mock of Verifier interface.
+type MockVerifier struct {
+ ctrl *gomock.Controller
+ recorder *MockVerifierMockRecorder
+}
+
+// MockVerifierMockRecorder is the mock recorder for MockVerifier.
+type MockVerifierMockRecorder struct {
+ mock *MockVerifier
+}
+
+// NewMockVerifier creates a new mock instance.
+func NewMockVerifier(ctrl *gomock.Controller) *MockVerifier {
+ mock := &MockVerifier{ctrl: ctrl}
+ mock.recorder = &MockVerifierMockRecorder{mock}
+ return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use.
+func (m *MockVerifier) EXPECT() *MockVerifierMockRecorder {
+ return m.recorder
+}
+
+// Verify mocks base method.
+func (m *MockVerifier) Verify(arg0 context.Context, arg1 string, arg2 *[32]byte) error {
+ m.ctrl.T.Helper()
+ ret := m.ctrl.Call(m, "Verify", arg0, arg1, arg2)
+ ret0, _ := ret[0].(error)
+ return ret0
+}
+
+// Verify indicates an expected call of Verify.
+func (mr *MockVerifierMockRecorder) Verify(arg0, arg1, arg2 interface{}) *gomock.Call {
+ mr.mock.ctrl.T.Helper()
+ return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Verify", reflect.TypeOf((*MockVerifier)(nil).Verify), arg0, arg1, arg2)
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-17 12:43:46 +0000