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Description of problem:
KrbLocalUserMapping uses krb5_aname_to_localname() to translate a principal name to a local account name. mod_auth_kerb-5.4-9.el6 has a bug whereby it fails with an Apache HTTP 500 response if the length of the account name greater than or equal to that of the principal name. I'm attaching a patch
Version-Release number of selected component (if applicable):
mod_auth_kerb-5.4-9.el6
How is this reproducible:
Steps to Reproduce:
1. Configure Apache for Negotiate/GSSAPI/Kerberos authentication using mod_auth_kerb, with "KrbLocalUserMapping on".
2. Configure MIT Kerberos to map your client principal name to a local name which is as long or longer than the principal name, e.g. in /etc/krb5.conf:
[realms]
REDHAT.COM = {
auth_to_local = RULE:[1:$1@$0]s/^you$/somethingevenlonger/
}
Actual results:
Apache responds with an HTTP 500 "internal server" error, with this log message from mod_auth_kerb:
krb5_aname_to_localname() failed: Insufficient space to return complete information
Expected results:
The HTTP request should succeed with "somethingevenlonger" as the REMOTE_USER supplied by mod_auth_kerb.
Additional info:
If the lenght of the translation string is less than that of the principal name, it works. This is because mod_auth_kerb allocates a buffer for the translation based on the length of the client principal name, rather than suing some reasonable independent upper bound (in my patch I used 255 characters).
Comment 2RHEL Program Management
2012-10-16 22:49:38 UTC
This request was evaluated by Red Hat Product Management for
inclusion in the current release of Red Hat Enterprise Linux.
Because the affected component is not scheduled to be updated
in the current release, Red Hat is unable to address this
request at this time.
Red Hat invites you to ask your support representative to
propose this request, if appropriate, in the next release of
Red Hat Enterprise Linux.
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.
http://rhn.redhat.com/errata/RHBA-2013-0860.html
Description of problem: KrbLocalUserMapping uses krb5_aname_to_localname() to translate a principal name to a local account name. mod_auth_kerb-5.4-9.el6 has a bug whereby it fails with an Apache HTTP 500 response if the length of the account name greater than or equal to that of the principal name. I'm attaching a patch Version-Release number of selected component (if applicable): mod_auth_kerb-5.4-9.el6 How is this reproducible: Steps to Reproduce: 1. Configure Apache for Negotiate/GSSAPI/Kerberos authentication using mod_auth_kerb, with "KrbLocalUserMapping on". 2. Configure MIT Kerberos to map your client principal name to a local name which is as long or longer than the principal name, e.g. in /etc/krb5.conf: [realms] REDHAT.COM = { auth_to_local = RULE:[1:$1@$0]s/^you$/somethingevenlonger/ } Actual results: Apache responds with an HTTP 500 "internal server" error, with this log message from mod_auth_kerb: krb5_aname_to_localname() failed: Insufficient space to return complete information Expected results: The HTTP request should succeed with "somethingevenlonger" as the REMOTE_USER supplied by mod_auth_kerb. Additional info: If the lenght of the translation string is less than that of the principal name, it works. This is because mod_auth_kerb allocates a buffer for the translation based on the length of the client principal name, rather than suing some reasonable independent upper bound (in my patch I used 255 characters).