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Bug 1685610 - nslcd aborts when rhost is large and UseDNS is true
Summary: nslcd aborts when rhost is large and UseDNS is true
Keywords:
Status: NEW
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: nss-pam-ldapd
Version: 7.7
Hardware: All
OS: All
unspecified
medium
Target Milestone: rc
: ---
Assignee: Jakub Hrozek
QA Contact: BaseOS QE Security Team
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2019-03-05 16:16 UTC by John Jasen
Modified: 2019-03-06 07:36 UTC (History)
2 users (show)

Fixed In Version:
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Description John Jasen 2019-03-05 16:16:51 UTC
Description of problem:
remote DNS entry exceeds 63 characters, resulting in nslcd errors such as:

nslcd[6080]: [04f329] client supplied argument 6 bytes too large
sshd[9868]: pam_ldap(sshd:account): error reading from nslcd: Connection reset by peer

Version-Release number of selected component (if applicable):
nss-pam-ldapd-0.8.13-16.el7.x86_64

How reproducible:
Always

Steps to Reproduce:
1. set a long name in DNS for the client host
2. enable UseDNS on the ssh server
3. ssh from verylongfqdnname to ssh server

Actual results:
sshd[1773]: error: PAM: User account has expired for USERNAME from VERYLONGFQDNNAME

Expected results:
successful login

Additional info:

Comment 2 John Jasen 2019-03-05 16:25:52 UTC
See Debian bug tracker: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=890508


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