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Bug 643616

Summary:	sftp should fallback to sshv1 if server doesn't support sshv2
Product:	Red Hat Enterprise Linux 6	Reporter:	Miroslav Vadkerti <mvadkert>
Component:	openssh	Assignee:	Jan F. Chadima <jchadima>
Status:	CLOSED NOTABUG	QA Contact:	BaseOS QE Security Team <qe-baseos-security>
Severity:	medium	Docs Contact:
Priority:	low
Version:	6.0
Target Milestone:	rc
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:	643615	Environment:
Last Closed:	2010-11-08 12:32:39 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	643615
Bug Blocks:

Description Miroslav Vadkerti 2010-10-16 11:36:21 UTC

+++ This bug was initially created as a clone of Bug #643615 +++

Description of problem:
sftp doesn't fallback to protocol SSHv1 if SSHv2 not available.

Version-Release number of selected component (if applicable):
openssh-4.3p2-58.el5

How reproducible:
100%

Steps to Reproduce:
1. Configure sshd to use only protocol 1
2. try to connect with sftp
  
Actual results:
sftp fails:
Connecting to localhost...
Protocol major versions differ: 2 vs. 1
Couldn't read packet: Connection reset by peer


Expected results:
sftp fallbacks to protocol 1

Additional info:
This seems to be an upstream issue (reproduced on F13). This is also reproducible on RHEL6

Comment 2 Jan F. Chadima 2010-11-08 12:32:39 UTC

The problem is because the protocol 1 does not know anything about sftp. 
The correct usage of sftp on the protocol 1 is sftp -s /usr/libexec/openssh/sftp-server -o protocol 1 host