Bug 825313

Summary: sss_ssh_knownhostsproxy prevents connection to machine without reverse address
Product: [Fedora] Fedora Reporter: Martin Kosek <mkosek>
Component: sssdAssignee: Lubomir Rintel <lkundrak>
Status: CLOSED NOTABUG QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: unspecified    
Version: 17CC: jhrozek, sbose, sgallagh, ssorce
Target Milestone: ---   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2012-05-25 12:07:38 EDT Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Description Martin Kosek 2012-05-25 12:02:18 EDT
Description of problem:
When I install IPA server with SSH support (and thus sss_ssh_knownhostsproxy is used as a ProxyCommand in ssh_config) , I cannot ssh to machine without a reverse address:

# host vm-050.idm.lab.bos.redhat.com
vm-050.idm.lab.bos.redhat.com has address
# host
Host not found: 3(NXDOMAIN)

# ssh -vv vm-050.idm.lab.bos.redhat.com
OpenSSH_5.9p1, OpenSSL 1.0.0j-fips 10 May 2012
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 54: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Executing proxy command: exec /usr/bin/sss_ssh_knownhostsproxy -p 22 vm-050.idm.lab.bos.redhat.com
debug1: permanently_set_uid: 0/0
debug1: identity file /root/.ssh/id_rsa type -1
debug1: identity file /root/.ssh/id_rsa-cert type -1
debug1: identity file /root/.ssh/id_dsa type -1
debug1: identity file /root/.ssh/id_dsa-cert type -1
debug1: permanently_drop_suid: 0
Reverse lookup failed
ssh_exchange_identification: Connection closed by remote host

When the proxy command is commented, the connection to the same machine works.

This is too strict, we cannot require working reverse records for every machine we want to connect to.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. Install IPA server on a machine
2. On that machine, try to connect to other machine without a reverse record
Actual results:
Connection is rejected

Expected results:
Connection is accepted

Additional info:
I think this issue is present also in RHEL 6.3 Beta.
Comment 1 Martin Kosek 2012-05-25 12:07:38 EDT
Sorry, wrong product.
Comment 2 Stephen Gallagher 2012-05-25 12:07:47 EDT
*** Bug 825316 has been marked as a duplicate of this bug. ***
Comment 3 Martin Kosek 2012-05-25 12:13:09 EDT
Bug 825316 is not a duplicate, I closed this Bug before it as it seemed to have wrong fields filled (like the owner).