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Description of problem:
Unable to use ldapsearch -Y GSSAPI to obtain TGT based on machine credentials via gssproxy

How reproducible:
always

Steps to Reproduce:
1. join machine to AD domain using "net ads join" command, storing machine credentials in /etc/krb5.keytab

2. Configure GSSPROXY to impersonate user trying to run ldapsearch:

[service/myimpersonator]
   mechs = krb5
   debug = yes
   krb5_principal = MYHOST$@EXAMPLE.COM
   cred_store = ccache:FILE:/var/lib/gssproxy/clients/krb5cc_%U
   cred_store = keytab:/etc/krb5.test.keytab
   cred_usage = initiate
   euid = 1000

3. Use ldapsearch:
bash$ export GSS_USE_PROXY=yes
bash$ ldapsearch -h dcduba.dublin.ad.s3group.com
SASL/GSSAPI authentication started
ldap_sasl_interactive_bind_s: Local error (-2)
	additional info: SASL(-1): generic failure: GSSAPI Error: Unspecified GSS failure.  Minor code may provide more information (No Kerberos credentials available)


Actual results:
ldapsearch fails

Expected results:
ldapsearch should succeed

Additional info:
running 'gssproxy -i -d' does not provide enough debug information to troubleshoot the problem

Update: it starts to work if I replace:

   cred_store = keytab:/etc/krb5.test.keytab
with
   cred_store = client_keytab:/etc/krb5.test.keytab


Also note that krb5_principal parameter is still being ignored, i.e. if keytab also contains SPNs, it is quite a big chance it won't work.

Can we fix it?

Fixed merged upstream.

Ok, will the fix be available in RHEL7 at some stage, too?

(In reply to Ondrej from comment #3)
> Ok, will the fix be available in RHEL7 at some stage, too?

Hopefully.  We're not sure when yet.

krb5_principal option still not working, hence marking as FailedQA.

[root@dhcp207-130 ~]# rpm -q gssproxy
gssproxy-0.4.1-13.el7.x86_64
[root@dhcp207-130 ~]# 

Please find the attached file for verification steps with console output for reference.

Verified using gssproxy :: gssproxy-0.7.0-3.el7.x86_64

Marking BZ as verified. See attachment for console.log.

Created attachment 1284111 [details]
console.log

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://access.redhat.com/errata/RHBA-2017:2033