[gssproxy] Re: gssproxy broken on fedora

[Simo Sorce]

Hi Rob,
I can reproduce your issue now and I am looking into this issue and I
suspect nfs-utils may have broken gss-proxy support recently.

I am not sure yet, but some critical areas have been changed, so I need
to better investigate them. It will take me a little time as I am at
Devconf.cz now, but hopefully I will have an answer for you in a few
days.

Simo.

On Sat, 2017-01-21 at 13:10 +0100, Rob Verduijn wrote:
> Another fresh install of a fedora25 client, now with the new gssproxy
> 0.6.0 package, but that one does not work either.
>
> Created the file /etc/gssproxy/00-apache.conf
> [service/apache]
>   mechs = krb5
>   cred_store = ccache:FILE:/var/lib/gssproxy/clients/krb5cc_apache
>   cred_store = client_keytab:/var/lib/gssproxy/clients/httpd.keytab
>   cred_usage = initiate
>   euid = 48
>
> put the keytab in the specified place
> added debug settings to /etc/gssproxy/gssproxy.conf
> [gssproxy]
> debug = true
> debug_level = 9
>
> I did  not touch the file /etc/sysconfig/nfs 
> Since the default setting of GSS_USE_PROXY="yes" is what I want
>
> Checked the logs, nothing in there besides what you get from 
> systemctl status gssproxy.service
>
> su - apache -s /bin/bash
> and no access to the shares is allowed
>
> Weird thing I noticed, when browsing as root the nfs mounts are
> readable ( root is squashed ) but not as the apache user.
> Root gets to read it with nobody:nobody privileges but apache with
> apache:apache is refused.
>
> I'm really at a loss as to what to do next.
>
> Do I need to set an environment variable to make this work ?
>
> Rob Verduijn
>
> 2017-01-04 23:14 GMT+01:00 Rob Verduijn :
> > 2017-01-04 20:56 GMT+01:00 Simo Sorce :
> > > On Wed, 2017-01-04 at 19:41 +0100, Rob Verduijn wrote:
> > > > 2017-01-04 19:27 GMT+01:00 Dmitri Pal :
> > > > > On 01/04/2017 01:13 PM, Rob Verduijn wrote:
> > > > >
> > > > > 2017-01-04 14:59 GMT+01:00 Simo Sorce :
> > > > > > On Wed, 2017-01-04 at 10:16 +0100, Rob Verduijn wrote:
> > > > > > > ---------- Forwarded message ----------
> > > > > > > From: Simo Sorce 
> > > > > > > Date: 2017-01-03 17:32 GMT+01:00
> > > > > > > Subject: [gssproxy] Re: gssproxy broken on fedora
> > > > > > > To: The GSS-Proxy developers and users mailing list <
> > > > > > > [e-mail]>
> > > > > > >
> > > > > > >
> > > > > > > On Mon, 2017-01-02 at 19:22 +0100, Rob Verduijn wrote:
> > > > > > > >
> > > > > > > > Nope that does not work on either fc24 or fc25.
> > > > > > > > I did not try centos73 since it already worked on that
> > >
> > > one.
> > > > > > >
> > > > > > > Given you tried manually, make sure you delete the ccache
> > >
> > > before trying
> > > > > > > with the client_keytab setting.
> > > > > > >
> > > > > > > If that doesn't work can you set debug = True in the
> > >
> > > global section and
> > > > > > > tell me if you get any useful output/error ?
> > > > > > >
> > > > > > > Simo.
> > > > > > >
> > > > > > > --
> > > > > > > Simo Sorce * Red Hat, Inc * New York
> > > > > > > _______________________________________________
> > > > > > > gss-proxy mailing list -- [e-mail]
> > > > > > > To unsubscribe send an email to [e-mail]
> > >
> > > rahosted.org
> > > > > > >
> > > > > > >
> > > > > > > Hi,
> > > > > > >
> > > > > > > I checked for the cache, but there were no cache files
> > >
> > > present in
> > > > > > > /var/lib/gssproxy/clients.
> > > > > > > I cleaned the sssd cache.
> > > > > > > I set the debug entry, did a reboot, but also no log
> > >
> > > entries appeared
> > > > > > >
> > > > > > > current /etc/gssproxy/gssproxy.conf
> > > > > > >
> > > > > > > [gssproxy]
> > > > > > > debug=True
> > > > > > >
> > > > > > > [service/HTTP]
> > > > > > >   mechs = krb5
> > > > > > >   cred_store = keytab:/etc/gssproxy/http.keytab
> > > > > > >   cred_store = ccache:/var/lib/gssproxy/clients/krb5cc_%U
> > > > > > >   cred_store = client_keytab:/etc/gssproxy/http.keytab
> > > > > > >   euid = 48
> > > > > > >
> > > > > > > and tested it with
> > > > > > > su - apache -s /bin/bash
> > > > > > >
> > > > > > > The mount works fine for a regular ipa user on fedora
> > >
> > > 24/25
> > > > > > > according to systemctl status gssproxy the service is up
> > >
> > > and running,
> > > > > > >
> > > > > > > [root@fedora-24 ~]# systemctl status gssproxy
> > > > > > > ● gssproxy.service - GSSAPI Proxy Daemon
> > > > > > >    Loaded: loaded
> > >
> > > (/usr/lib/systemd/system/gssproxy.service; disabled;
> > > > > > > vendor preset: disabled)
> > > > > > >    Active: active (running) since Wed 2017-01-04 10:05:55
> > >
> > > CET; 8min ago
> > > > > > >  Main PID: 987 (gssproxy)
> > > > > > >    CGroup: /system.slice/gssproxy.service
> > > > > > >            └─987 /usr/sbin/gssproxy -D
> > > > > > >
> > > > > > > systemd[1]: Starting GSSAPI Proxy Daemon...
> > > > > > > gssproxy[972]: [2017/01/04 09:05:55]: Debug Enabled
> > >
> > > (level: 1)
> > > > > > > gssproxy[972]: [2017/01/04 09:05:55]: Client connected (fd
> > >
> > > =
> > > > > > 10)[2017/01/04
> > > > > > > 09:05:55]:  (pid = 987) (uid = 0) (gid = 0)[2017/01/04
> > >
> > > 09:05:55]:
> > > > > > (context
> > > > > > > = system_u:system_r:kernel_t:s0)[2017/01/04 09:05:55]:
> > > > > > > Started GSSAPI Proxy Daemon.
> > > > > >
> > > > > > If you turn on rpc.gssd debugging and kernel rpc debugging
> > >
> > > do you see
> > > > > > anything relevant ?
> > > > > >
> > > > > > Simo.
> > > > > >
> > > > > > --
> > > > > > Simo Sorce * Red Hat, Inc * New York
> > > > > > _______________________________________________
> > > > > > gss-proxy mailing list -- [e-mail]
> > > > > > To unsubscribe send an email to [e-mail]
> > >
> > > hosted.org
> > > > > >
> > > > >
> > > > > It does not seem to look for the credits specified in the
> > >
> > > gssproxy.conf
> > > > > file.
> > > > > How can I verify the running configuration of gssproxy ?
> > > > >
> > > > > Rob Verduijn
> > > > >
> > > > > Jan  4 18:52:50 fedora-24 rpc.gssd[1034]:
> > >
> > > #012handle_gssd_upcall:
> > > > > 'mech=krb5 uid=48 enctypes=18,17,16,23,3,1,2 ' (nfs/clnt0)
> > > > > Jan  4 18:52:50 fedora-24 rpc.gssd[1034]:
> > >
> > > krb5_not_machine_creds: uid 48
> > > > > tgtname (null)
> > > > > Jan  4 18:52:50 fedora-24 rpc.gssd[1034]: ERROR: GSS-API:
> > >
> > > error in
> > > > > gss_acquire_cred(): GSS_S_FAILURE (Unspecified GSS failure.
> > >
> > > Minor code may
> > > > > provide more information) - No Kerberos credentials available
> > >
> > > (default
> > > > > cache: KEYRING:persistent:48)
> > > > > Jan  4 18:52:50 fedora-24 rpc.gssd[1034]: looking for client
> > >
> > > creds with
> > > > > uid 48 for server nfs.example.com in /tmp
> > > > > Jan  4 18:52:50 fedora-24 rpc.gssd[1034]: CC
> > >
> > > '/tmp/krb5ccmachine_EXAMPLE.COM'
> > > > > being considered, with preferred realm 'EXAMPLE.COM'
> > > > > Jan  4 18:52:50 fedora-24 rpc.gssd[1034]: CC
> > >
> > > '/tmp/krb5ccmachine_EXAMPLE.COM'
> > > > > owned by 0, not 48
> > > > > Jan  4 18:52:50 fedora-24 rpc.gssd[1034]: looking for client
> > >
> > > creds with
> > > > > uid 48 for server nfs.example.com in /run/user/%U
> > > > > Jan  4 18:52:50 fedora-24 rpc.gssd[1034]: Error doing scandir
> > >
> > > on directory
> > > > > '/run/user/48': No such file or directory
> > > > > Jan  4 18:52:50 fedora-24 rpc.gssd[1034]: doing error
> > >
> > > downcall
> > > > > gss-proxy mailing list -- [e-mail]
> > > > > To unsubscribe send an email to [e-mail]
> > >
> > > osted.org
> > > > > Why are you preferring credential cache in a file over a
> > >
> > > keyring which is
> > > > > default?
> > > > > Have you tried without cred_store =
> > >
> > > ccache:/var/lib/gssproxy/clients/krb5cc_%U
> > > > > ?
> > > > >
> > > > > --
> > > > > Thank you,
> > > > > Dmitri Pal
> > > > >
> > > > > Engineering Director, Identity Management and Platform
> > >
> > > Security
> > > > > Red Hat, Inc.
> > > > >
> > > > > gss-proxy mailing list -- [e-mail]
> > > > > To unsubscribe send an email to [e-mail]
> > >
> > > osted.org
> > > > >
> > > >
> > > > Because it said so in the example here :
> > > > https://fedorahosted.org/gss-proxy/wiki/Apache
> > > >
> > > > But  have tried it without and it still fails.
> > > >
> > > > Rob Verduijn
> > > > _______________________________________________
> > > > gss-proxy mailing list -- [e-mail]
> > > > To unsubscribe send an email to [e-mail]
> > >
> > > ted.org
> > >
> > > Rob is rpc.gssd running with the USE_GSS_PROXY=Yes environment
> > > variable
> > > on ?
> > > If not then gssproxy is simply not involved here
> > >
> > > Simo.
> > >
> > > --
> > > Simo Sorce * Red Hat, Inc * New York
> > > _______________________________________________
> > > gss-proxy mailing list -- [e-mail]
> > > To unsubscribe send an email to [e-mail]
> > > d.org
> >
> > There is a
> > GSS_USE_PROXY=yes in /etc/sysconfig/nfs
> > so I added USE_GSS_PROXY=yes to it and also to the script  
> > /usr/libexec/nfs-utils/nfs-utils_env.sh
> > so that it gets applied to the the file 
> > /run/sysconfig/nfs-utils at boot.
> > I double checked after a reboot
> > verified the share was working for an ordinary user
> > but not for the apache user when using 'su - apache -s /bin/bash'
> > also checked the kvno of the http.keytab just to make sure I wasn't
> > missing the obvious.
> > still no go.
> >
> > Rob Verduijn
>
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