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Adding function to parse output of klist -k KeytabFile to get first principal #38

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Adding function to parse output of klist -k KeytabFile to get first principal #38

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24 changes: 22 additions & 2 deletions krbticket/config.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,6 @@
import logging
import multiprocessing
import os

logger = logging.getLogger(__name__)


Expand All @@ -20,7 +19,6 @@ def __init__(self, principal=None, keytab=None, kinit_bin="kinit",
'wait_exponential_multiplier': 1000,
'wait_exponential_max': 30000,
'stop_max_attempt_number': 10}):
self.principal = principal
self.keytab = keytab
self.kinit_bin = kinit_bin
self.klist_bin = klist_bin
Expand All @@ -33,6 +31,10 @@ def __init__(self, principal=None, keytab=None, kinit_bin="kinit",
self.ccache_name = ccache_name if ccache_name else self._ccache_name()
self.ccache_lockfile = '{}.krbticket.lock'.format(self.ccache_name)
self.ccache_cmd_lockfile = '{}.krbticket.cmd.lock'.format(self.ccache_name)
if principal is None and keytab is not None:
self.principal = _get_first_principal_from_keytab()
else:
self.principal = principal

def __str__(self):
super_str = super(KrbConfig, self).__str__()
Expand Down Expand Up @@ -71,3 +73,21 @@ def _per_process_ccache_name(self):
logger.info("env KRB5CCNAME is updated to '{}' for multiprocessing".format(new_ccname))

return os.environ.get('KRB5CCNAME')

def _get_first_principal_from_keytab()
from krbticket.commands import KrbCommand
commands = []
commands.append(self.klist_bin)
commands.append("-k")
commands.append(self.keytab)

klistFromKeytabRows = KrbCommand._call(config, commands).splitlines()

if len(klistFromKeytabRows) >= 5:
principals = list()
for rowIndex in range(3,len(klistFromKeytabRows)-1):
principals.append(klistFromKeytabRows[rowIndex].strip().split(" ")[1])
if len(principals) >= 1:
return principals[0]
else:
return None