Re: pgadmin kerberos auth propblem - Delegated credentials not supplied. - Mailing list pgadmin-support

Hello,

 

I have trouble to setup kerberos authetication with pgadmin. I run pgadmin in the docker container and I’d like to use SPENGO SSO to access pgadmin. Pgadmin fails to authenticate user and the error message is „'Delegated credentials not supplied.“ It seem, that credentials does not contain delegated part. Do you have any suggestion where is the problem with my setup? Do you use kerberos auth – pls can you share your setup or just explain it a little bit?

 

We have kdc servers on the linux and there is trust between active directory (we use kerberos for many other services and it is working properly). I tried to connect from the PC where I’m loggend in the AD.

 

Docker container

Dockerfile

FROM dpage/pgadmin4:6.17

 

COPY krb5.conf /etc/krb5.conf

COPY config.py /pgadmin4/config.py

 

config.py changed variables (we have reason why to change vars here)

AUTHENTICATION_SOURCES = ['kerberos','internal']

KRB_APP_HOST_NAME = ‚fqdn of pgadmin‘

KRB_KTNAME = '/var/lib/pgadmin/pgadmin.keytab'

 

krb5.conf

cat krb5-wsl.conf

[libdefaults]

clockskew = 18000

canonicalize = true

dns_canonicalize_hostname= false

rdns = false

default_realm = EXAMPLE.COM

default_keytab_name=/var/lib/pgadmin/pgadmin.keytab

dns_lookup_kdc = false

#ignore_acceptor_hostname = true

proxiable = true

realm_try_domains = 1

 

dns_lookup_realm = false

ticket_lifetime = 86400

renew_lifetime = 604800

forwardable = true

#default_tgs_enctypes = aes256-cts-hmac-sha1-96

#default_tkt_enctypes = aes256-cts-hmac-sha1-96

permitted_enctypes =  aes256-cts aes128-cts

udp_preference_limit = 1

kdc_timeout = 5000

 

[realms]

EXAMPLE.COM = {

kdc = kdc01.EXAMPLE.COM

kdc = kdc02.EXAMPLE.COM

admin_server = kdc01.EXAMPLE.COM

default_domain = EXAMPLE.COM

}

[domain_realm]

.EXAMPLE.COM=EXAMPLE.COM

EXAMPLE.COM = EXAMPLE.COM

 

 

pgadmin4/pgadmin/authenticate/kerberos.py

 

    def negotiate_start(self, in_token):

        svc_princ = gssapi.Name('HTTP@%s' % config.KRB_APP_HOST_NAME,

                                name_type=gssapi.NameType.hostbased_service)

        cname = svc_princ.canonicalize(gssapi.MechType.kerberos)

 

        try:

            server_creds = gssapi.Credentials(usage='accept', name=cname)

            context = gssapi.SecurityContext(creds=server_creds)

            out_token = context.step(base64.b64decode(in_token))

        except Exception as e:

            current_app.logger.exception(e)

            return False, e

 

        if out_token and not context.complete:

            return False, out_token

        if context.complete:

            deleg_creds = context.delegated_creds

            if not hasattr(deleg_creds, 'name'):

                error_msg = gettext('Delegated credentials not supplied.')

                current_app.logger.error(error_msg)

                return False, Exception(error_msg)

            try:

...

 

 

Thank you

Regards

Milanm

 

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