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# Authors: Rob Crittenden <rcritten@redhat.com>
#
# Copyright (C) 2010 Red Hat
# see file 'COPYING' for use and warranty information
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# Some certmonger functions, mostly around updating the request file.
# This is used so we can add tracking to the Apache and 389-ds
# server certificates created during the IPA server installation.
import os
import re
import time
from ipapython import ipautil
REQUEST_DIR='/var/lib/certmonger/requests/'
def find_request_value(filename, directive):
"""
Return a value from a certmonger request file for the requested directive
It tries to do this a number of times because sometimes there is a delay
when ipa-getcert returns and the file is fully updated, particularly
when doing a request. Genrerating a CSR is fast but not instantaneous.
"""
tries = 1
value = None
found = False
while value is None and tries <= 5:
tries=tries + 1
time.sleep(1)
fp = open(filename, 'r')
lines = fp.readlines()
fp.close()
for line in lines:
if found:
# A value can span multiple lines. If it does then it has a
# leading space.
if not line.startswith(' '):
# We hit the next directive, return now
return value
else:
value = value + line[1:]
else:
if line.startswith(directive + '='):
found = True
value = line[len(directive)+1:]
return value
def get_request_value(request_id, directive):
"""
There is no guarantee that the request_id will match the filename
in the certmonger requests directory, so open each one to find the
request_id.
"""
fileList=os.listdir(REQUEST_DIR)
for file in fileList:
value = find_request_value('%s/%s' % (REQUEST_DIR, file), 'id')
if value is not None and value.rstrip() == request_id:
return find_request_value('%s/%s' % (REQUEST_DIR, file), directive)
return None
def get_request_id(criteria):
"""
If you don't know the certmonger request_id then try to find it by looking
through all the request files. An alternative would be to parse the
ipa-getcert list output but this seems cleaner.
criteria is a tuple of key/value pairs to search for. The more specific
the better. An error is raised if multiple request_ids are returned for
the same criteria.
None is returned if none of the criteria match.
"""
assert type(criteria) is tuple
reqid=None
fileList=os.listdir(REQUEST_DIR)
for file in fileList:
match = True
for (key, value) in criteria:
rv = find_request_value('%s/%s' % (REQUEST_DIR, file), key)
if rv is None or rv.rstrip() != value:
match = False
break
if match and reqid is not None:
raise RuntimeError('multiple certmonger requests match the criteria')
if match:
reqid = find_request_value('%s/%s' % (REQUEST_DIR, file), 'id').rstrip()
return reqid
def add_request_value(request_id, directive, value):
"""
Add a new directive to a certmonger request file.
The certmonger service MUST be stopped in order for this to work.
"""
fileList=os.listdir(REQUEST_DIR)
for file in fileList:
id = find_request_value('%s/%s' % (REQUEST_DIR, file), 'id')
if id is not None and id.rstrip() == request_id:
current_value = find_request_value('%s/%s' % (REQUEST_DIR, file), directive)
if not current_value:
fp = open('%s/%s' % (REQUEST_DIR, file), 'a')
fp.write('%s=%s\n' % (directive, value))
fp.close()
return
def add_principal(request_id, principal):
"""
In order for a certmonger request to be renwable it needs a principal.
When an existing certificate is added via start-tracking it won't have
a principal.
"""
return add_request_value(request_id, 'template_principal', principal)
def add_subject(request_id, subject):
"""
In order for a certmonger request to be renwable it needs the subject
set in the request file.
When an existing certificate is added via start-tracking it won't have
a subject_template set.
"""
return add_request_value(request_id, 'template_subject', subject)
def request_cert(nssdb, nickname, subject, principal, passwd_fname=None):
"""
Execute certmonger to request a server certificate
"""
args = ['/usr/bin/ipa-getcert',
'request',
'-d', nssdb,
'-n', nickname,
'-N', subject,
'-K', principal,
]
if passwd_fname:
args.append('-p')
args.append(passwd_fname)
(stdout, stderr, returncode) = ipautil.run(args)
# FIXME: should be some error handling around this
m = re.match('New signing request "(\d+)" added', stdout)
request_id = m.group(1)
return request_id
def cert_exists(nickname, secdir):
"""
See if a nickname exists in an NSS database.
Returns True/False
This isn't very sophisticated in that it doesn't differentiate between
a database that doesn't exist and a nickname that doesn't exist within
the database.
"""
args = ["/usr/bin/certutil", "-L",
"-d", secdir,
"-n", nickname
]
(stdout, stderr, rc) = ipautil.run(args, raiseonerr=False)
if rc == 0:
return True
else:
return False
def start_tracking(nickname, secdir, password_file=None):
"""
Tell certmonger to track the given certificate nickname in NSS
database in secdir protected by optional password file password_file.
Returns the stdout, stderr and returncode from running ipa-getcert
This assumes that certmonger is already running.
"""
if not cert_exists(nickname, secdir):
raise RuntimeError('Nickname "%s" doesn\'t exist in NSS database "%s"' % (nickname, secdir))
args = ["/usr/bin/ipa-getcert", "start-tracking",
"-d", secdir,
"-n", nickname]
if password_file:
args.append("-p")
args.append(password_file)
(stdout, stderr, returncode) = ipautil.run(args)
return (stdout, stderr, returncode)
def stop_tracking(secdir, request_id=None, nickname=None):
"""
Stop tracking the current request using either the request_id or nickname.
This assumes that the certmonger service is running.
"""
if request_id is None and nickname is None:
raise RuntimeError('Both request_id and nickname are missing.')
if nickname:
# Using the nickname find the certmonger request_id
criteria = (('cert_storage_location','%s' % secdir),('cert_nickname', '%s' % nickname))
try:
request_id = get_request_id(criteria)
if request_id is None:
return ('', '', 0)
except RuntimeError:
# This means that multiple requests matched, skip it for now
# Fall back to trying to stop tracking using nickname
pass
args = ['/usr/bin/ipa-getcert',
'stop-tracking',
]
if request_id:
args.append('-i')
args.append(request_id)
else:
args.append('-n')
args.append(nickname)
args.append('-d')
args.append(secdir)
(stdout, stderr, returncode) = ipautil.run(args)
return (stdout, stderr, returncode)
if __name__ == '__main__':
request_id = request_cert("/etc/httpd/alias", "Test", "cn=tiger.example.com,O=IPA", "HTTP/tiger.example.com@EXAMPLE.COM")
csr = get_request_value(request_id, 'csr')
print csr
stop_tracking(request_id)
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