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Bug 1161173

Summary:	sshd sets KRB5CCNAME environment variable with a truncated value
Product:	Red Hat Enterprise Linux 7	Reporter:	Petr Lautrbach <plautrba>
Component:	openssh	Assignee:	Petr Lautrbach <plautrba>
Status:	CLOSED ERRATA	QA Contact:	Marek Marusic <mmarusic>
Severity:	high	Docs Contact:
Priority:	high
Version:	7.1	CC:	ksrot, mgrepl, plautrba, riehecky, tmraz
Target Milestone:	rc
Target Release:	---
Hardware:	All
OS:	All
Whiteboard:
Fixed In Version:	openssh-6.6.1p1-6.el7	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-03-05 09:28:40 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Petr Lautrbach 2014-11-06 15:02:03 UTC

+++ This bug was initially created as a clone of Bug #1161073 +++

Description of problem:

After logging in with ssh, kerberos ticket cache is not found due to environment variable KRB5CCNAME being truncated (missing the last 2 characters).



Version-Release number of selected component (if applicable):
openssh-6.4p1-5


How reproducible:
Every time

Steps to Reproduce:
1. login via kerberos-enabled ssh 
2. 
3.

Actual results:
`klist` cannot find credentials cache because KRB5CCNAME does not have full file path

Expected results:
KRB5CCNAME should contain "FILE:/path/to/credentials_cache"


Additional info:
The bug was introduced with 'openssh-6.3p1-krb5-use-default_ccache_name.patch'

The calculation of the length (len) of authctxt->krb5_ccname is short by 2 bytes - it does not allow for the ':' or the terminating 0.
"""
len = strlen(authctxt->krb5_ticket_file) + strlen(ccache_type);
authctxt->krb5_ccname = xmalloc(len);
...
snprintf(authctxt->krb5_ccname, len, "%s:%s", ccache_type, authctxt->krb5_ticket_file);
"""

--- Additional comment from Petr Lautrbach on 2014-11-06 15:54:07 CET ---

Good catch, sir! Thanks for the report and the patch.

It's even case for the 'default_ccache_name = KEYRING:persistent:%{uid}'

Comment 6 errata-xmlrpc 2015-03-05 09:28:40 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHSA-2015-0425.html