Fix no tty error while executing with -external-ssh option

README.ja.md

@@ -669,7 +669,11 @@ Vulsは２種類のSSH接続方法をサポートしている。
 これは、SSHコマンドがインストールされていない環境でも動作する（Windowsなど）  
 
 外部SSHコマンドを使ってスキャンするためには、`-ssh-external`を指定する。
-SSH Configが使えるので、ProxyCommandを使った多段SSHなどが可能。
+SSH Configが使えるので、ProxyCommandを使った多段SSHなどが可能。  
+CentOSでは、スキャン対象サーバの/etc/sudoersに以下を追加する必要がある(user: vuls)
+```
+Defaults:vuls !requiretty
+```
 
 ## -ask-key-password option 
 

README.md

@@ -669,6 +669,11 @@ This is useful in situations where you may not have access to traditional UNIX t
 
 To use external ssh command, specify this option.   
 This is useful If you want to use ProxyCommand or chiper algorithm of SSH that is not supported by native go implementation.  
+Don't forget to add below line to /etc/sudoers on the target servers. (username: vuls)
+```
+Defaults:vuls !requiretty
+```
+
 
 ## -ask-key-password option 
 

scan/redhat.go

@@ -303,30 +303,19 @@ func (o *redhat) scanUnsecurePackagesUsingYumCheckUpdate() (CvePacksList, error)
 
 	// { packageName: changelog-lines }
 	var rpm2changelog map[string]*string
-	if !config.Conf.SSHExternal {
-		allChangelog, err := o.getAllChangelog(packInfoList)
-		if err != nil {
-			o.log.Errorf("Failed to getAllchangelog. err: %s", err)
-			return nil, err
-		}
-		rpm2changelog, err = o.parseAllChangelog(allChangelog)
-		if err != nil {
-			return nil, fmt.Errorf("Failed to parseAllChangelog. err: %s", err)
-		}
+	allChangelog, err := o.getAllChangelog(packInfoList)
+	if err != nil {
+		o.log.Errorf("Failed to getAllchangelog. err: %s", err)
+		return nil, err
+	}
+	rpm2changelog, err = o.parseAllChangelog(allChangelog)
+	if err != nil {
+		return nil, fmt.Errorf("Failed to parseAllChangelog. err: %s", err)
 	}
 
 	var results []PackInfoCveIDs
 	for i, packInfo := range packInfoList {
-		changelog := ""
-		if !config.Conf.SSHExternal {
-			changelog = o.getChangelogCVELines(rpm2changelog, packInfo)
-		} else {
-			changelog, err = o.getChangelog(packInfo.Name)
-			if err != nil {
-				o.log.Errorf("Failed to collect CVE IDs. err: %s", err)
-				return nil, err
-			}
-		}
+		changelog := o.getChangelogCVELines(rpm2changelog, packInfo)
 
 		// Collect unique set of CVE-ID in each changelog
 		uniqueCveIDMap := make(map[string]bool)
@@ -470,25 +459,6 @@ func (o *redhat) parseYumCheckUpdateLine(line string) (models.PackageInfo, error
 	}, nil
 }
 
-func (o *redhat) getChangelog(packageNames string) (stdout string, err error) {
-	command := ""
-	if o.ServerInfo.User == "root" {
-		command = "echo N | "
-	}
-	if 0 < len(config.Conf.HTTPProxy) {
-		command += util.ProxyEnv()
-	}
-
-	// yum update --changelog doesn't have --color option.
-	command += fmt.Sprintf(" yum update --changelog %s | grep CVE", packageNames)
-
-	r := o.ssh(command, sudo)
-	if !r.isSuccess(0, 1) {
-		return "", fmt.Errorf("Failed to SSH: %s", r)
-	}
-	return r.Stdout, nil
-}
-
 func (o *redhat) mkPstring() *string {
 	str := ""
 	return &str
@@ -609,7 +579,7 @@ func (o *redhat) getAllChangelog(packInfoList models.PackageInfoList) (stdout st
 	}
 
 	// yum update --changelog doesn't have --color option.
-	command += fmt.Sprintf(" yum update --changelog %s", packageNames)
+	command += fmt.Sprintf(" LANG=en_US.UTF-8 yum update --changelog %s", packageNames)
 
 	r := o.ssh(command, sudo)
 	if !r.isSuccess(0, 1) {

scan/sshutil.go

@@ -126,7 +126,7 @@ func parallelSSHExec(fn func(osTypeInterface) error, timeoutSec ...int) (errs []
 }
 
 func sshExec(c conf.ServerInfo, cmd string, sudo bool, log ...*logrus.Entry) (result sshResult) {
-	if runtime.GOOS == "windows" || !conf.Conf.SSHExternal {
+	if isSSHExecNative() {
 		result = sshExecNative(c, cmd, sudo)
 	} else {
 		result = sshExecExternal(c, cmd, sudo)
@@ -137,6 +137,10 @@ func sshExec(c conf.ServerInfo, cmd string, sudo bool, log ...*logrus.Entry) (re
 	return
 }
 
+func isSSHExecNative() bool {
+	return runtime.GOOS == "windows" || !conf.Conf.SSHExternal
+}
+
 func sshExecNative(c conf.ServerInfo, cmd string, sudo bool) (result sshResult) {
 	result.Servername = c.ServerName
 	result.Host = c.Host
@@ -203,6 +207,7 @@ func sshExecExternal(c conf.ServerInfo, cmd string, sudo bool) (result sshResult
 	}
 
 	defaultSSHArgs := []string{
+		"-t",
 		"-o", "StrictHostKeyChecking=no",
 		"-o", "UserKnownHostsFile=/dev/null",
 		"-o", "LogLevel=quiet",
@@ -289,6 +294,7 @@ func decolateCmd(c conf.ServerInfo, cmd string, sudo bool) string {
 			cmd = fmt.Sprintf(`docker exec %s /bin/bash -c "%s"`, c.Container.ContainerID, cmd)
 		}
 	}
+	//  cmd = fmt.Sprintf("set -x; %s", cmd)
 	return cmd
 }