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#!/usr/bin/env python3
# Works with both python2 and python3; please preserve this property
# Copyright (C) 2016 mod_auth_gssapi contributors - See COPYING for (C) terms
# If one uses both sessions and unique ccache names, then the filesystem will
# become littered with ccache files unless the accessed application cleans
# them up itself. This script will minimize ccache file proliferation by
# removing any ccaches that have expired from the filesystem, and serves as an
# example of how this cleaning can be performed.
# gssproxy note: in order to sweep credentials, the sweeper needs to connect
# to gssproxy as if it were mod_auth_gssapi. In the configuration provided
# with mod_auth_gssapi (80-httpd.conf), this just consists of matching the
# gssproxy uid - so run it as the appropriate user (i.e., apache). Custom
# configurations require careful consideration of how to match the sweeper
# connection to the correct service in gssproxy; this script is just an
# example. This script will not attempt to contact gssproxy unless -g is
# passed.
import argparse
import os
import stat
import time
# try importing this first to provide a more useful error message
import gssapi
del gssapi
try:
from gssapi.raw import acquire_cred_from
except ImportError:
print("Your GSSAPI does not provide cred store extension; exiting!")
exit(1)
# process file as a ccache and indicate whether it is expired
def should_delete(fname, t):
try:
# skip directories and other non-files
st = os.stat(fname)
if not stat.S_ISREG(st.st_mode):
return False
# ignore files that are newer than 30 minutes
if t - st.st_mtime < 30 * 60:
return False
creds = acquire_cred_from({b"ccache": fname.encode("UTF-8")})
except FileNotFoundError:
# someone else did the work for us
return False
except Exception as e:
print("Not deleting %s due to error %s" % (fname, e))
return False
return creds.lifetime == 0
if __name__ == "__main__":
parser = argparse.ArgumentParser(description="Sweep expired ccaches")
parser.add_argument("-g", dest="gssproxy", action="store_true",
help="is gssproxy in use (default: no)")
parser.add_argument("dirs", nargs='+')
args = parser.parse_args()
if args.gssproxy:
os.environ["GSS_USE_PROXY"] = "yes"
os.environ["GSSPROXY_BEHAVIOR"] = "REMOTE_FIRST"
print("System looks okay; running sweeper...")
t = time.time()
for basedir in args.dirs:
os.chdir(basedir)
print("Sweeping %s" % basedir)
for fname in os.listdir(basedir):
if should_delete(fname, t):
os.unlink(fname)
print("Sweeper finished successfully!")
exit(0)
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