draft-ietf-secsh-connect-05.txt   draft-ietf-secsh-connect-06.txt 
Network Working Group T. Ylonen Network Working Group T. Ylonen
INTERNET-DRAFT T. Kivinen INTERNET-DRAFT T. Kivinen
draft-ietf-secsh-connect-05.txt M. Saarinen draft-ietf-secsh-connect-06.txt M. Saarinen
Expires in six months T. Rinne Expires in six months T. Rinne
S. Lehtinen S. Lehtinen
SSH SSH
22 February 1999 22 June 1999
SSH Connection Protocol SSH Connection Protocol
Status of This memo Status of This Memo
This document is an Internet-Draft and is in full conformance This document is an Internet-Draft and is in full conformance
with all provisions of Section 10 of RFC2026. with all provisions of Section 10 of RFC2026.
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that Task Force (IETF), its areas, and its working groups. Note that
other groups may also distribute working documents as other groups may also distribute working documents as
Internet-Drafts. Internet-Drafts.
Internet-Drafts are draft documents valid for a maximum of six Internet-Drafts are draft documents valid for a maximum of six
skipping to change at page 2, line 37 skipping to change at page 2, line 37
4.7. Starting a Shell or a Command . . . . . . . . . . . . . . . 10 4.7. Starting a Shell or a Command . . . . . . . . . . . . . . . 10
4.8. Session Data Transfer . . . . . . . . . . . . . . . . . . . 10 4.8. Session Data Transfer . . . . . . . . . . . . . . . . . . . 10
4.9. Window Dimension Change Message . . . . . . . . . . . . . . 11 4.9. Window Dimension Change Message . . . . . . . . . . . . . . 11
4.10. Local Flow Control . . . . . . . . . . . . . . . . . . . . 11 4.10. Local Flow Control . . . . . . . . . . . . . . . . . . . . 11
4.11. Signals . . . . . . . . . . . . . . . . . . . . . . . . . . 11 4.11. Signals . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.12. Returning Exit Status . . . . . . . . . . . . . . . . . . . 12 4.12. Returning Exit Status . . . . . . . . . . . . . . . . . . . 12
5. TCP/IP Port Forwarding . . . . . . . . . . . . . . . . . . . . . 12 5. TCP/IP Port Forwarding . . . . . . . . . . . . . . . . . . . . . 12
5.1. Requesting Port Forwarding . . . . . . . . . . . . . . . . . 12 5.1. Requesting Port Forwarding . . . . . . . . . . . . . . . . . 12
5.2. TCP/IP Forwarding Channels . . . . . . . . . . . . . . . . . 13 5.2. TCP/IP Forwarding Channels . . . . . . . . . . . . . . . . . 13
6. Encoding of Terminal Modes . . . . . . . . . . . . . . . . . . . 14 6. Encoding of Terminal Modes . . . . . . . . . . . . . . . . . . . 14
7. Summary of Message Numbers . . . . . . . . . . . . . . . . . . . 15 7. Summary of Message Numbers . . . . . . . . . . . . . . . . . . . 16
8. Security Considerations . . . . . . . . . . . . . . . . . . . . 16 8. Security Considerations . . . . . . . . . . . . . . . . . . . . 16
9. References . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 9. Trademark Issues . . . . . . . . . . . . . . . . . . . . . . . . 17
10. Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . 17 10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 17
11. Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . 17
1. Introduction 1. Introduction
The SSH Connection Protocol has been designed to run on top of the SSH The SSH Connection Protocol has been designed to run on top of the SSH
transport layer and user authentication protocols. It provides transport layer and user authentication protocols. It provides
interactive login sessions, remote execution of commands, forwarded interactive login sessions, remote execution of commands, forwarded
TCP/IP connections, and forwarded X11 connections. The service name for TCP/IP connections, and forwarded X11 connections. The service name for
this protocol (after user authentication) is "ssh-connection". this protocol (after user authentication) is "ssh-connection".
This document should be read only after reading the SSH architecture This document should be read only after reading the SSH architecture
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what can be forwarded. Administrators should be able to deny what can be forwarded. Administrators should be able to deny
forwardings where appropriate. forwardings where appropriate.
Since this protocol normally runs inside an encrypted tunnel, firewalls Since this protocol normally runs inside an encrypted tunnel, firewalls
will not be able to examine the traffic. will not be able to examine the traffic.
It is RECOMMENDED that implementations disable all of the potentially It is RECOMMENDED that implementations disable all of the potentially
dangerous features (e.g. agent forwarding, X11 forwarding, and TCP/IP dangerous features (e.g. agent forwarding, X11 forwarding, and TCP/IP
forwarding) if the host key has changed. forwarding) if the host key has changed.
9. References 9. Trademark Issues
SSH is a registered trademark and Secure Shell is a trademark of SSH
Communications Security Ltd. SSH Communications Security Ltd permits
the use of these trademarks as the name of this standard and protocol,
and permits their use to describe that a product conforms to this
standard, provided that the following acknowledgement is included
where the trademarks are used: ``SSH is a registered trademark and
Secure Shell is a trademark of SSH Communications Security Ltd
(www.ssh.fi)''. These trademarks may not be used as part of a product
name or in otherwise confusing manner without prior written permission
of SSH Communications Security Ltd.
10. References
[RFC-1766] Alvestrand, H., "Tags for the Identification of Languages", [RFC-1766] Alvestrand, H., "Tags for the Identification of Languages",
March 1995. March 1995.
[RFC-1884] Hinden, R., and Deering, S., "IP Version 6 Addressing [RFC-1884] Hinden, R., and Deering, S., "IP Version 6 Addressing
Architecture", December 1995 Architecture", December 1995
[RFC-2044] Yergeau, F., "UTF-8, a Transformation Format of Unicode and [RFC-2044] Yergeau, F., "UTF-8, a Transformation Format of Unicode and
ISO 10646", October 1996. ISO 10646", October 1996.
[SSH-ARCH] Ylonen, T., et al, "SSH Protocol Architecture", Internet [SSH-ARCH] Ylonen, T., et al, "SSH Protocol Architecture", Internet
Draft, draft-ietf-secsh-architecture-03.txt Draft, draft-ietf-secsh-architecture-04.txt
[SSH-TRANS] Ylonen, T., et al, "SSH Transport Layer Protocol", Internet [SSH-TRANS] Ylonen, T., et al, "SSH Transport Layer Protocol", Internet
Draft, draft-ietf-secsh-transport-05.txt Draft, draft-ietf-secsh-transport-06.txt
[SSH-USERAUTH] Ylonen, T., et al, "SSH Authentication Protocol", [SSH-USERAUTH] Ylonen, T., et al, "SSH Authentication Protocol",
Internet Draft, draft-ietf-secsh-userauth-05.txt Internet Draft, draft-ietf-secsh-userauth-06.txt
10. Authors' Addresses 11. Authors' Addresses
Tatu Ylonen Tatu Ylonen
SSH Communications Security Ltd. SSH Communications Security Ltd.
Tekniikantie 12 Tekniikantie 12
FIN-02150 ESPOO FIN-02150 ESPOO
Finland Finland
E-mail: ylo@ssh.fi E-mail: ylo@ssh.fi
Tero Kivinen Tero Kivinen
SSH Communications Security Ltd. SSH Communications Security Ltd.
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