use configured private key for ssh calls

client/client.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"net/http"
 	"os"
+	"path/filepath"
 	"strings"
 
 	sshgit "github.com/go-git/go-git/v5/plumbing/transport/ssh"
@@ -17,6 +18,7 @@ import (
 	"github.com/gomicro/trust"
 	"github.com/google/go-github/github"
 	"golang.org/x/crypto/ssh"
+	"golang.org/x/crypto/ssh/knownhosts"
 	"golang.org/x/oauth2"
 	"golang.org/x/time/rate"
 )
@@ -60,14 +62,17 @@ func New(cfg *config.Config) (*Client, error) {
 
 	var publicKeys *sshgit.PublicKeys
 	if cfg.Github.PrivateKey != "" && cfg.Github.Username != "" {
-		pem := []byte("")
+		pem := []byte(cfg.Github.PrivateKey)
 
-		publicKeys, err := sshgit.NewPublicKeys(cfg.Github.Username, pem, "")
+		publicKeys, err = sshgit.NewPublicKeys(cfg.Github.Username, pem, "")
 		if err != nil {
 			return nil, fmt.Errorf("public keys: %w", err)
 		}
 
-		publicKeys.HostKeyCallback = ssh.InsecureIgnoreHostKey()
+		publicKeys.HostKeyCallback, err = knownHostsCallback()
+		if err != nil {
+			return nil, fmt.Errorf("known hosts: %w", err)
+		}
 	} else if cfg.Github.PrivateKeyFile != "" {
 		_, err := os.Stat(cfg.Github.PrivateKeyFile)
 		if err != nil {
@@ -79,16 +84,24 @@ func New(cfg *config.Config) (*Client, error) {
 			return nil, fmt.Errorf("public keys file: %w", err)
 		}
 
-		publicKeys.HostKeyCallback = ssh.InsecureIgnoreHostKey()
+		publicKeys.HostKeyCallback, err = knownHostsCallback()
+		if err != nil {
+			return nil, fmt.Errorf("known hosts: %w", err)
+		}
 	}
 
 	var pass *sshgit.Password
 	if cfg.Github.Username != "" && cfg.Github.Token != "" {
+		hostKeyCallback, err := knownHostsCallback()
+		if err != nil {
+			return nil, fmt.Errorf("known hosts: %w", err)
+		}
+
 		pass = &sshgit.Password{
 			User:     cfg.Github.Username,
 			Password: cfg.Github.Token,
 			HostKeyCallbackHelper: sshgit.HostKeyCallbackHelper{
-				HostKeyCallback: ssh.InsecureIgnoreHostKey(),
+				HostKeyCallback: hostKeyCallback,
 			},
 		}
 	}
@@ -118,6 +131,20 @@ func New(cfg *config.Config) (*Client, error) {
 	}, nil
 }
 
+func knownHostsCallback() (ssh.HostKeyCallback, error) {
+	usr, err := os.UserHomeDir()
+	if err != nil {
+		return nil, fmt.Errorf("home dir: %w", err)
+	}
+
+	cb, err := knownhosts.New(filepath.Join(usr, ".ssh", "known_hosts"))
+	if err != nil {
+		return nil, fmt.Errorf("parse known_hosts: %w", err)
+	}
+
+	return cb, nil
+}
+
 func (c *Client) GetLogins(ctx context.Context) ([]string, error) {
 	logins := []string{}