> For the complete documentation index, see [llms.txt](https://joungkyun.gitbook.io/annyung-3-user-guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://joungkyun.gitbook.io/annyung-3-user-guide/annyung3-package-catalog/annyung3-base-packages/pkg-base-openssh.md).

# openssh

## Description:

An open source implementation of SSH protocol versions 1 and 2

## Changes on AnNyung:

1. X 의존성 제거
2. 서버 기본 설정 변경 (*/etc/ssh/sshd\_config*)
   * KeyRegenerationInterval 0
   * UseDNS no
   * GSSAPIAuthentication no
   * X11Forwarding no
   * Banner /etc/issue.net
   * AcceptEnv 에 USER\_LANG 환경 변수 추가
3. 클라이언트 기본 설정 변경 (*/etc/ssh/ssh\_config*)
   * GSSAPIAuthentication no
   * ForwardX11Trusted no
   * SendEnv 에 USER\_LANG 환경 변수 추가
4. Banner 지시자에 지정된 파일(/etc/issue.net\_)에 Magic Cookie 지원
5. ssh client에서 IDN 지원

   ```bash
   [root@an3 ~]$ ssh 청와대.com -v
   OpenSSH_6.6.1, OpenSSL 1.0.1e-fips 11 Feb 2013
   debug1: Reading configuration data /etc/ssh/ssh_config
   debug1: /etc/ssh/ssh_config line 49: Applying options for *
   debug1: Connecting to 청와대.com [211.234.63.232] port 22.
   ^C
   [root@an3 ~]$
   ```
6. host key check skip 옵션 추가 (*-H*)
   * 아래 예제는 둘다 동일한 방법임.

     ```bash
     [oops@an3 ~]$ ssh -H test.com
     [oops@an3 ~]$ ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no test.com
     ```

## Sub packages:

* **openssh-clients** - An open source SSH client applications
* **openssh-keycat** - A mls keycat backend for openssh
* **openssh-ldap** - A LDAP support for open source SSH server daemon
* **openssh-server** - An open source SSH server daemon
* **openssh-server-sysvinit** - The SysV initscript to manage the OpenSSH server.
* **pam\_ssh\_agent\_auth** - PAM module for authentication with ssh-agent