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package client
import (
"fmt"
"io"
"reflect"
"testing"
"github.com/mimecast/dtail/internal/io/dlog"
gossh "golang.org/x/crypto/ssh"
)
type mockPublicKey struct {
id string
}
func (k *mockPublicKey) Type() string {
return "ssh-rsa"
}
func (k *mockPublicKey) Marshal() []byte {
return []byte(k.id)
}
func (k *mockPublicKey) Verify(_ []byte, _ *gossh.Signature) error {
return nil
}
type mockSigner struct {
key gossh.PublicKey
}
func newMockSigner(id string) gossh.Signer {
return &mockSigner{key: &mockPublicKey{id: id}}
}
func (s *mockSigner) PublicKey() gossh.PublicKey {
return s.key
}
func (s *mockSigner) Sign(_ io.Reader, _ []byte) (*gossh.Signature, error) {
return &gossh.Signature{
Format: "ssh-rsa",
Blob: []byte("sig"),
}, nil
}
func TestCollectKnownHostsAuthMethodsOrder(t *testing.T) {
homeDir := "/tmp/dtail-auth-order"
t.Setenv("HOME", homeDir)
// Keep this unit test deterministic regardless of integration-mode env.
t.Setenv("DTAIL_INTEGRATION_TEST_RUN_MODE", "")
originalPrivateKeySigner := privateKeySigner
originalAgentSigners := agentSigners
originalLogger := dlog.Client
dlog.Client = &dlog.DLog{}
t.Cleanup(func() {
privateKeySigner = originalPrivateKeySigner
agentSigners = originalAgentSigners
dlog.Client = originalLogger
})
var callOrder []string
successfulPrivateKeys := map[string]gossh.Signer{
"/custom/id_fast": newMockSigner("custom"),
homeDir + "/.ssh/id_rsa": newMockSigner("default-rsa"),
homeDir + "/.ssh/id_dsa": newMockSigner("default-dsa"),
}
privateKeySigner = func(path string) (gossh.Signer, error) {
callOrder = append(callOrder, "private:"+path)
signer, found := successfulPrivateKeys[path]
if !found {
return nil, fmt.Errorf("missing private key: %s", path)
}
return signer, nil
}
agentSigners = func(keyIndex int) ([]gossh.Signer, error) {
callOrder = append(callOrder, fmt.Sprintf("agent:%d", keyIndex))
return []gossh.Signer{newMockSigner("agent")}, nil
}
methods := collectKnownHostsAuthMethods("/custom/id_fast", 7)
if len(methods) != 1 {
t.Fatalf("Expected 1 auth method, got %d", len(methods))
}
callOrder = nil
signers := collectKnownHostsSigners("/custom/id_fast", 7)
if len(signers) != 4 {
t.Fatalf("Expected 4 signers, got %d", len(signers))
}
expectedOrder := []string{
"private:/custom/id_fast",
"agent:7",
"private:/tmp/dtail-auth-order/.ssh/id_rsa",
"private:/tmp/dtail-auth-order/.ssh/id_dsa",
"private:/tmp/dtail-auth-order/.ssh/id_ecdsa",
"private:/tmp/dtail-auth-order/.ssh/id_ed25519",
}
if !reflect.DeepEqual(callOrder, expectedOrder) {
t.Fatalf("Unexpected auth method call order.\nexpected: %v\ngot: %v", expectedOrder, callOrder)
}
}
func TestCollectKnownHostsAuthMethodsSkipsDuplicateDefaultPath(t *testing.T) {
homeDir := "/tmp/dtail-auth-dedupe"
t.Setenv("HOME", homeDir)
// Keep this unit test deterministic regardless of integration-mode env.
t.Setenv("DTAIL_INTEGRATION_TEST_RUN_MODE", "")
originalPrivateKeySigner := privateKeySigner
originalAgentSigners := agentSigners
originalLogger := dlog.Client
dlog.Client = &dlog.DLog{}
t.Cleanup(func() {
privateKeySigner = originalPrivateKeySigner
agentSigners = originalAgentSigners
dlog.Client = originalLogger
})
sharedSigner := newMockSigner("shared")
var callOrder []string
privateKeySigner = func(path string) (gossh.Signer, error) {
callOrder = append(callOrder, "private:"+path)
if path == homeDir+"/.ssh/id_rsa" {
return sharedSigner, nil
}
return nil, fmt.Errorf("missing private key: %s", path)
}
agentSigners = func(keyIndex int) ([]gossh.Signer, error) {
callOrder = append(callOrder, fmt.Sprintf("agent:%d", keyIndex))
return []gossh.Signer{sharedSigner}, nil
}
methods := collectKnownHostsAuthMethods(homeDir+"/.ssh/id_rsa", 2)
if len(methods) != 1 {
t.Fatalf("Expected 1 auth method, got %d", len(methods))
}
callOrder = nil
signers := collectKnownHostsSigners(homeDir+"/.ssh/id_rsa", 2)
if len(signers) != 1 {
t.Fatalf("Expected duplicate keys to collapse to 1 signer, got %d", len(signers))
}
expectedOrder := []string{
"private:/tmp/dtail-auth-dedupe/.ssh/id_rsa",
"agent:2",
"private:/tmp/dtail-auth-dedupe/.ssh/id_dsa",
"private:/tmp/dtail-auth-dedupe/.ssh/id_ecdsa",
"private:/tmp/dtail-auth-dedupe/.ssh/id_ed25519",
}
if !reflect.DeepEqual(callOrder, expectedOrder) {
t.Fatalf("Unexpected auth method call order.\nexpected: %v\ngot: %v", expectedOrder, callOrder)
}
}
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