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Diffstat (limited to 'gluster/swift/common/middleware/swiftkerbauth/kerbauth_utils.py')
| -rw-r--r-- | gluster/swift/common/middleware/swiftkerbauth/kerbauth_utils.py | 137 |
1 files changed, 0 insertions, 137 deletions
diff --git a/gluster/swift/common/middleware/swiftkerbauth/kerbauth_utils.py b/gluster/swift/common/middleware/swiftkerbauth/kerbauth_utils.py deleted file mode 100644 index 599ef99..0000000 --- a/gluster/swift/common/middleware/swiftkerbauth/kerbauth_utils.py +++ /dev/null @@ -1,137 +0,0 @@ -# Copyright (c) 2013 Red Hat, Inc. -# -# Licensed under the Apache License, Version 2.0 (the "License"); -# you may not use this file except in compliance with the License. -# You may obtain a copy of the License at -# -# http://www.apache.org/licenses/LICENSE-2.0 -# -# Unless required by applicable law or agreed to in writing, software -# distributed under the License is distributed on an "AS IS" BASIS, -# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or -# implied. -# See the License for the specific language governing permissions and -# limitations under the License. - -import re -import random -import grp -import signal -from subprocess import Popen, PIPE -from time import time -from gluster.swift.common.middleware.swiftkerbauth \ - import TOKEN_LIFE, RESELLER_PREFIX - - -def get_remote_user(env): - """Retrieve REMOTE_USER set by Apache from environment.""" - remote_user = env.get('REMOTE_USER', "") - matches = re.match('([^@]+)@.*', remote_user) - if not matches: - raise RuntimeError("Malformed REMOTE_USER \"%s\"" % remote_user) - return matches.group(1) - - -def get_auth_data(mc, username): - """ - Returns the token, expiry time and groups for the user if it already exists - on memcache. Returns None otherwise. - - :param mc: MemcacheRing object - :param username: swift user - """ - token, expires, groups = None, None, None - memcache_user_key = '%s/user/%s' % (RESELLER_PREFIX, username) - candidate_token = mc.get(memcache_user_key) - if candidate_token: - memcache_token_key = '%s/token/%s' % (RESELLER_PREFIX, candidate_token) - cached_auth_data = mc.get(memcache_token_key) - if cached_auth_data: - expires, groups = cached_auth_data - if expires > time(): - token = candidate_token - else: - expires, groups = None, None - return (token, expires, groups) - - -def set_auth_data(mc, username, token, expires, groups): - """ - Stores the following key value pairs on Memcache: - (token, expires+groups) - (user, token) - """ - auth_data = (expires, groups) - memcache_token_key = "%s/token/%s" % (RESELLER_PREFIX, token) - mc.set(memcache_token_key, auth_data, time=TOKEN_LIFE) - - # Record the token with the user info for future use. - memcache_user_key = '%s/user/%s' % (RESELLER_PREFIX, username) - mc.set(memcache_user_key, token, time=TOKEN_LIFE) - - -def generate_token(): - """Generates a random token.""" - # We don't use uuid.uuid4() here because importing the uuid module - # causes (harmless) SELinux denials in the audit log on RHEL 6. If this - # is a security concern, a custom SELinux policy module could be - # written to not log those denials. - r = random.SystemRandom() - token = '%stk%s' % \ - (RESELLER_PREFIX, - ''.join(r.choice('abcdef0123456789') for x in range(32))) - return token - - -def get_groups_from_username(username): - """Return a set of groups to which the user belongs to.""" - # Retrieve the numerical group IDs. We cannot list the group names - # because group names from Active Directory may contain spaces, and - # we wouldn't be able to split the list of group names into its - # elements. - p = Popen(['id', '-G', username], stdout=PIPE) - if p.wait() != 0: - raise RuntimeError("Failure running id -G for %s" % username) - (p_stdout, p_stderr) = p.communicate() - - # Convert the group numbers into group names. - groups = [] - for gid in p_stdout.strip().split(" "): - groups.append(grp.getgrgid(int(gid))[0]) - - # The first element of the list is considered a unique identifier - # for the user. We add the username to accomplish this. - if username in groups: - groups.remove(username) - groups = [username] + groups - groups = ','.join(groups) - return groups - - -def run_kinit(username, password): - """Runs kinit command as a child process and returns the status code.""" - kinit = Popen(['kinit', username], - stdin=PIPE, stdout=PIPE, stderr=PIPE) - kinit.stdin.write('%s\n' % password) - - # The following code handles a corner case where the Kerberos password - # has expired and a prompt is displayed to enter new password. Ideally, - # we would want to read from stdout but these are blocked reads. This is - # a hack to kill the process if it's taking too long! - - class Alarm(Exception): - pass - - def signal_handler(signum, frame): - raise Alarm - # Set the signal handler and a 1-second alarm - signal.signal(signal.SIGALRM, signal_handler) - signal.alarm(1) - try: - kinit.wait() # Wait for the child to exit - signal.alarm(0) # Reset the alarm - return kinit.returncode # Exit status of child on graceful exit - except Alarm: - # Taking too long, kill and return error - kinit.kill() - return -1 |