2010/10/4 Matt Carey <cvstealth2000@xxxxxxxxx>
Andrey,
Thanks for the reply. I do see the ldap/station1.example.com ticket show up on the user end and I see the KDC issuing the ticket to the client, but I still get the SASL authentication failures. The one thing I see in the klist output is that the ldap ticket entry doesn't have the Kerberos REALM on it. Do you see that behavior as well in your implementation?
Client side:
[mcarey@station1 ~]$ kinit mcarey[mcarey@station1 ~]$ klist -e10/04/10 12:35:49 10/04/10 19:15:49 krbtgt/STATION1.EXAMPLE.COM@STATION1.EXAMPLE.COM
Ticket cache: FILE:/tmp/krb5cc_5000_hYlO20
Default principal: mcarey@xxxxxxxxxxxxxxxxxxxx
Valid starting Expires Service principal
Etype (skey, tkt): Triple DES cbc mode with HMAC/sha1, Triple DES cbc mode with HMAC/sha1
[mcarey@station1 ~]$ /usr/bin/ldap -Y GSSAPI -h station1.example.com -b "dc=example,dc=com" "(cn=*)"
Kerberos 4 ticket cache: /tmp/tkt5000
klist: You have no tickets cached
-bash: /usr/bin/ldap: No such file or directory
[mcarey@station1 ~]$ /usr/bin/ldapsearch -Y GSSAPI -h station1.example.com -b "dc=example,dc=com" "(cn=*)"[mcarey@station1 ~]$ klist -e
SASL/GSSAPI authentication started
ldap_sasl_interactive_bind_s: Invalid credentials (49)
additional info: SASL(-13): authentication failure: GSSAPI Failure: gss_accept_sec_context10/04/10 12:35:49 10/04/10 19:15:49 krbtgt/STATION1.EXAMPLE.COM@STATION1.EXAMPLE.COM
Ticket cache: FILE:/tmp/krb5cc_5000_hYlO20
Default principal: mcarey@xxxxxxxxxxxxxxxxxxxx
Valid starting Expires Service principal
Etype (skey, tkt): Triple DES cbc mode with HMAC/sha1, Triple DES cbc mode with HMAC/sha1
10/04/10 12:37:48 10/04/10 19:15:49 ldap/station1.example.com@
It's strange you dont' have the REALM part of theldap/station1.example.com princinpal... So it won't be mapped by your "nsSaslMapRegexString: (.*)@STATATION1.EXAMPLE.COM". Verify that the server will be able to decrypt the data with its keytab :
kdestroy
kinit -k -t /etc/dirsrv/ds.keytab ' ldap/station1.example.com@STATION1.EXAMPLE.COM'
klist -e
I think you should also correct your mapping part. The default settings should be ok. And if you make your own mapping you should follow the same syntax of the default entries, that is you should escape the parentheses \(, it applies in particular to your "Station1 Kerberos Mapping" where nsSaslMapRegexString should be like \(.*\)@STATATION1.EXAMPLE.COM
If these verification are ok it means that either the server cannot correctly read the keytab or you don't have a user with uid=mcarey in your LDAP tree. To see more details in the access log you may switch on the logging of internal server searches : add 4 to the current value of nsslapd-accesslog-level attribute of cn=config, it should give something like
nsslapd-accesslog-level: 260
With internal searches logging enable you will see what exactly and how the server searches when it tries to map the principal to the entry
@+
kdestroy
kinit -k -t /etc/dirsrv/ds.keytab ' ldap/station1.example.com@STATION1.EXAMPLE.COM'
klist -e
I think you should also correct your mapping part. The default settings should be ok. And if you make your own mapping you should follow the same syntax of the default entries, that is you should escape the parentheses \(, it applies in particular to your "Station1 Kerberos Mapping" where nsSaslMapRegexString should be like \(.*\)@STATATION1.EXAMPLE.COM
If these verification are ok it means that either the server cannot correctly read the keytab or you don't have a user with uid=mcarey in your LDAP tree. To see more details in the access log you may switch on the logging of internal server searches : add 4 to the current value of nsslapd-accesslog-level attribute of cn=config, it should give something like
nsslapd-accesslog-level: 260
With internal searches logging enable you will see what exactly and how the server searches when it tries to map the principal to the entry
@+
KDC/DS side:
Kerberos 4 ticket cache: /tmp/tkt5000
klist: You have no tickets cached
# tail -n0 -f /var/log/krb5kdc.log
Oct 04 12:39:06 station1.example.com krb5kdc[7514](info): AS_REQ (7 etypes {16 1 11 10 15 12 13}) 10.100.0.45: ISSUE: authtime 1286210346, etypes {rep=16 tkt=16 ses=16}, mcarey@xxxxxxxxxxxxxxxxxxxx for krbtgt/STATION1.EXAMPLE.COM@STATION1.EXAMPLE.COM
Oct 04 12:39:55 station1.example.com krb5kdc[7514](info): TGS_REQ (2 etypes {16 1}) 10.100.0.45: ISSUE: authtime 1286210346, etypes {rep=16 tkt=16 ses=16}, mcarey@xxxxxxxxxxxxxxxxxxxx for ldap/station1.example.com@STATION1.EXAMPLE.COM
#
DS access log entries:
[04/Oct/2010:12:39:55 -0400] conn=8 fd=64 slot=64 connection from 10.100.0.45 to 10.100.0.45
[04/Oct/2010:12:39:55 -0400] conn=8 op=0 BIND dn="" method=sasl version=3 mech=GSSAPI
[04/Oct/2010:12:39:55 -0400] conn=8 op=0 RESULT err=49 tag=97 nentries=0 etime=0
[04/Oct/2010:12:39:55 -0400] conn=8 op=-1 fd=64 closed - B1
--Matt
From: Andrey Ivanov <andrey.ivanov@xxxxxxxxxxxxxxxx>
To: General discussion list for the 389 Directory server project. <389-users@xxxxxxxxxxxxxxxxxxxxxxx>
Sent: Mon, October 4, 2010 12:30:43 PM
Subject: Re: [389-users] GSSAPI authentication to Directory Server
Hi,
Try
kinit username
<mdp>
klist -e
/usr/bin/ldapsearch -Y GSSAPI -h station1.example.com -b "dc=example,dc=com" "(cn=*)"
klist -e
<you should see the additional ticket ldap/station1.example.com>
At least, that's how it works in our system
2010/10/4 Matt Carey <cvstealth2000@xxxxxxxxx>
I'm trying to follow the Kerberos howto guide at http://directory.fedoraproject.org/wiki/Howto:Kerberos but am having an issue authenticating to the Directory Server with GSSAPI/Kerberos tickets:
$ /usr/lib/mozldap/ldapsearch -h station1.example.com -p 389 -o mech=GSSAPI -o authid="mcarey@xxxxxxxxxxxxxxxxxxxx" -o authzid="mcarey@xxxxxxxxxxxxxxxxxxxx" -b "dc=example,dc=com" "(cn=*)"
Bind Error: Invalid credentials
Bind Error: additional info: SASL(-13): authentication failure: GSSAPI Failure: gss_accept_sec_context
Attempt with OpenLDAP client:
$ /usr/bin/ldapsearch -Y GSSAPI -X u:mcarey -b "" -s base -LLL -H ldap://station1.example.com -b "dc=example,dc=com" "(cn=*)"
SASL/GSSAPI authentication started
ldap_sasl_interactive_bind_s: Invalid credentials (49)
additional info: SASL(-13): authentication failure: GSSAPI Failure: gss_accept_sec_context
Resulting in the following entries in the access log on the DS:
# tail -5 access
[04/Oct/2010:10:44:14 -0400] conn=18 fd=68 slot=68 connection from 10.100.0.45 to 10.100.0.45
[04/Oct/2010:10:44:14 -0400] conn=18 op=0 BIND dn="" method=sasl version=3 mech=GSSAPI
[04/Oct/2010:10:44:14 -0400] conn=18 op=0 RESULT err=49 tag=97 nentries=0 etime=0
[04/Oct/2010:10:44:14 -0400] conn=18 op=1 UNBIND
[04/Oct/2010:10:44:14 -0400] conn=18 op=1 fd=68 closed - U1
From what I can tell the Kerberos infrastructure and OS components are setup accordingly:
GSSAPI is a viable SASL mechanism:
$ /usr/lib/mozldap/ldapsearch -b "" -h station1 -p 389 -s base "(objectClass=*)" supportedSASLMechanisms
version: 1
dn:
supportedSASLMechanisms: EXTERNAL
supportedSASLMechanisms: DIGEST-MD5
supportedSASLMechanisms: GSSAPI
supportedSASLMechanisms: LOGIN
supportedSASLMechanisms: CRAM-MD5
supportedSASLMechanisms: ANONYMOUS
supportedSASLMechanisms: PLAIN
Directory Server keytab and contents:
# grep "nsslapd-localuser" dse.ldif
nsslapd-localuser: nobody
# ls -la ds.keytab
-rw------- 1 nobody nobody 172 Oct 3 13:21 ds.keytab
# ktutil
ktutil: rkt ./ds.keytab
ktutil: l
slot KVNO Principal
---- ---- ---------------------------------------------------------------------
1 3 ldap/station1.example.com@STATION1.EXAMPLE.COM
2 3 ldap/station1.example.com@STATION1.EXAMPLE.COM
# grep KRB /etc/sysconfig/dirsrv
KRB5_KTNAME=/etc/dirsrv/ds.keytab ; export KRB5_KTNAME
SASL maps in Directory Server:
dn: cn=Kerberos uid mapping,cn=mapping,cn=sasl,cn=config
objectClass: top
objectClass: nsSaslMapping
cn: Kerberos uid mapping
nsSaslMapRegexString: \(.*\)@\(.*\)\.\(.*\)
nsSaslMapBaseDNTemplate: dc=\2,dc=\3
nsSaslMapFilterTemplate: (uid=\1)
dn: cn=Station1 Kerberos Mapping,cn=mapping,cn=sasl,cn=config
objectClass: top
objectClass: nsSaslMapping
cn: Station1 Kerberos Mapping
nsSaslMapRegexString: (.*)@STATATION1.EXAMPLE.COM
nsSaslMapFilterTemplate: (objectclass=inetOrgPerson)
nsSaslMapBaseDNTemplate: uid=\1,ou=People,dc=example,dc=com
dn: cn=station1 map,cn=mapping,cn=sasl,cn=config
objectClass: top
objectClass: nsSaslMapping
cn: example map
cn: station1 map
nsSaslMapRegexString: \(.*\)
nsSaslMapBaseDNTemplate: ou=People,dc=example,dc=com
nsSaslMapFilterTemplate: (cn=\1)
Getting a ticket from the KDC:
[mcarey@station1 ~]$ kdestroy
[mcarey@station1 ~]$ kinit
Password for mcarey@xxxxxxxxxxxxxxxxxxxx:
[mcarey@station1 ~]$ klist
Ticket cache: FILE:/tmp/krb5cc_5000_hYlO20
Default principal: mcarey@xxxxxxxxxxxxxxxxxxxx
Valid starting Expires Service principal
10/04/10 10:57:20 10/04/10 17:37:20 krbtgt/STATION1.EXAMPLE.COM@STATION1.EXAMPLE.COM
Kerberos 4 ticket cache: /tmp/tkt5000
klist: You have no tickets cached
Any help or pointers people have would be greatly appreciated.
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