SSH, The Secure Shell: The Definitive Guide, 2nd Edition

Tectia Features

Tectia provides limited support for SSH-1, mostly by running programs from some older implementation whenever the SSH-1 protocol is required. Some of the Tectia programs do have built-in support for SSH-1, however.

Serverwide Configuration

The Tectia server has no built-in support for SSH-1, but it can be configured to run a separate SSH-1 server for SSH-1 clients. See "Compatibility Between SSH-1 and SSH-2 Servers" in Chapter 5.

The following keywords in the /etc/ssh2/sshd2_config file control SSH-1 compatibility mode:

Ssh1Compatibility

Run the SSH-1 server when SSH-1 clients connect (if yes).

Sshd1Path

The pathname for the SSH-1 server.

Sshd1ConfigFile

An alternate configuration file for the SSH-1 server, replacing the one specified for the Tectia server by the -f command-line option.

Client Configuration

The ssh -1t option runs an SSH-1 client program, and ssh -1i uses built-in SSH-1 emulation. See "Choosing a protocol version" in Chapter 7.

The following keywords in the /etc/ssh2/ssh2_config file control SSH-1 compatibility mode:

Ssh1Compatibility

Use SSH-1 if the server supports only supports the older protocol (if yes), or otherwise fail (if no).

Ssh1InternalEmulation

Use the Tectia client’s built-in SSH-1 functionality (if yes), or otherwise run an external SSH-1 program (if no).

Ssh1Path

The pathname for the external SSH-1 program.

Ssh1MaskPasswordLength

Send SSH_MSG_IGNORE packets with SSH-1 sessions to obscure the length of the password (if yes, the default). Otherwise, ...