def find_certificate(addr, local_domain, algo):
#algorithms:
# 0 = hybrid
# 1 = address bound DNS CERT
# 2 = domain bound DNS CERT
# 3 = address bound LDAP
# 4 = domain bound LDAP
# 5 = stored in database
logging.debug('Try finding certificate for address: %s', addr)
parts = addr.partition('@')
user = parts[0]
domain = parts[2]
if algo == 1 or algo == 0:
logging.debug('Trying address bound DNS CERT')
certs = certdisco.dns_cert(user + '.' + domain)
if certs != []:
for cert in certs:
if certvld.validate(cert,
local_domain,
addr,
domain,
addressBound=True):
logging.debug('A valid address bound DNS CERT was found')
return cert
logging.debug('No valid address bound DNS CERT found')
return None
logging.debug('No address bound DNS CERT found')
if algo == 2 or algo == 0:
logging.debug('Trying domain bound DNS CERT')
certs = certdisco.dns_cert(domain)
if certs != []:
for cert in certs:
if certvld.validate(cert,
local_domain,
addr,
domain,
addressBound=False):
logging.debug('A valid domain bound DNS CERT was found')
return cert
logging.debug('No valid domain bound DNS CERT found')
return None
logging.debug('No domain bound DNS CERT found')
if algo == 3 or algo == 0:
logging.debug('Trying address bound LDAP')
uris = certdisco.dns_srv(domain)
for uri in uris:
certs = certdisco.ldap_qry(uri, addr)
if certs != []:
for cert in certs:
if certvld.validate(cert,
local_domain,
addr,
domain,
addressBound=True):
logging.debug(
'A valid address bound LDAP was found using uri: '
+ uri)
return cert
logging.debug('No valid address bound LDAP found using uri: ' +
uri)
return None
logging.debug('No address bound LDAP found using uri: ' + uri)
logging.debug('No address bound LDAP found')
if algo == 4 or algo == 0:
logging.debug('Trying domain bound LDAP')
uris = certdisco.dns_srv(domain)
for uri in uris:
certs = certdisco.ldap_qry(uri, domain)
if certs != []:
for cert in certs:
if certvld.validate(cert,
local_domain,
addr,
domain,
addressBound=False):
logging.debug(
'A valid domain bound LDAP was found using uri: ' +
uri)
return cert
logging.debug('No valid domain bound LDAP found using uri: ' +
uri)
return None
logging.debug('No domain bound LDAP found using uri: ' + uri)
logging.debug('No domain bound LDAP found')
return None
def send_message(sender, recipient, message_id, message):
from M2Crypto import EVP, util, X509
import certdisco, certvld, crypto, subprocess, os
logging.debug('Start sending message to: %s', recipient)
domain = recipient.partition('@')[2]
sender_domain = sender.partition('@')[2]
try:
logging.debug('Connecting to "maildb" database')
conn = psycopg2.connect(database='maildb', user='******')
except psycopg2.OperationalError as dberr:
logging.error('Database connection failed: %s', dberr)
return 1
cur = conn.cursor();
logging.debug('Searching database record for domain: %s', domain)
cur.execute("SELECT anchor_path, crl_path, crypt_cert, cert_disco_algo FROM domains WHERE name = %s;", (domain,))
dom = cur.fetchone()
cur.close()
conn.close()
from_key = os.path.join(CADIR, 'key', sender_domain, 'direct.key') #EVP.load_key('direct.key', util.passphrase_callback)
from_cert = os.path.join(CADIR, 'cert', sender_domain, 'direct.pem') #X509.load_cert('direct.pem')
algo = 0 if dom == None else dom[3]
logging.debug('Certificate discovery algorithm: %s', algo)
if (dom != None) and (dom[3] == 5): #cert_disco_algo = local (cert saved to database)
logging.debug('Trying local CERT stored in database')
to_cert = None
if certvld.validate(dom[2], sender_domain, recipient, domain, addressBound = False):
logging.debug('A valid local CERT stored in database was found')
to_cert = dom[2]
logging.debug('No local CERT found')
else:
to_cert = find_certificate(recipient, sender_domain, algo)
if to_cert == None:
logging.warning('Recipient certificate not found: %s', recipient)
return 1
logging.debug('Securing message')
cms = crypto.to_smime(message, from_key, from_cert, to_cert)
logging.debug('Message secured')
logging.debug('Queueing encrypted mail message for: %s', recipient)
command = ('/usr/sbin/sendmail', '-f', sender, '--', recipient)
proc = subprocess.Popen(command, stdin=subprocess.PIPE)
#proc.stdin.write('From: <%s>\r\n' % sender)
proc.stdin.write('To: <%s>\r\n' % recipient)
proc.stdin.write('Message-ID: %s\r\n' % message_id)
proc.stdin.write(cms)
proc.communicate()
status = proc.returncode
if status == 0:
logging.debug('Message queued: %s: %s', message_id, recipient)
else:
logging.warning('Send message failed: %s: %s', message_id, recipient)
return status
def send_message(sender, recipient, message_id, message):
from M2Crypto import EVP, util, X509
import certdisco, certvld, crypto, subprocess, os
logging.debug('Start sending message to: %s', recipient)
recipient = recipient.lower()
domain = recipient.partition('@')[2]
sender_domain = sender.partition('@')[2]
msg = Parser().parsestr(message)
is_mdn = False
for mpart in msg.walk():
ct = mpart.get_content_type()
if ct == 'message/disposition-notification':
is_mdn = True
try:
logging.debug('Connecting to "maildb" database')
conn = psycopg2.connect(database='maildb', user='******')
except psycopg2.OperationalError as dberr:
logging.error('Database connection failed: %s', dberr)
logging.error(
format_log_message(sender, recipient, message_id,
'failed (Database connection failed)', is_mdn))
return 1
cur = conn.cursor()
logging.debug('Searching database record for domain: %s', domain)
cur.execute(
"SELECT anchor_path, crl_path, crypt_cert, cert_disco_algo FROM domains WHERE name = %s;",
(domain, ))
dom = cur.fetchone()
cur.close()
conn.close()
from_key = os.path.join(
CADIR, 'key', sender_domain,
'direct.key') #EVP.load_key('direct.key', util.passphrase_callback)
from_cert = os.path.join(CADIR, 'cert', sender_domain,
'direct.pem') #X509.load_cert('direct.pem')
algo = 0 if dom == None else dom[3]
logging.debug('Certificate discovery algorithm: %s', algo)
if (dom != None) and (
dom[3] == 5): #cert_disco_algo = local (cert saved to database)
logging.debug('Trying local CERT stored in database')
to_cert = None
if certvld.validate(dom[2],
sender_domain,
recipient,
domain,
addressBound=False):
logging.debug('A valid local CERT stored in database was found')
to_cert = dom[2]
logging.debug('No local CERT found')
else:
to_cert = find_certificate(recipient, sender_domain, algo)
if to_cert == None:
logging.warning(
format_log_message(sender, recipient, message_id,
'failed (Recipient certificate not found)',
is_mdn))
return 1
logging.debug('Securing message')
cms = crypto.to_smime(message, from_key, from_cert, to_cert)
logging.debug('Message secured')
logging.debug('Queueing encrypted mail message for: %s', recipient)
command = ('/usr/sbin/sendmail', '-f', sender, '--', recipient)
proc = subprocess.Popen(command, stdin=subprocess.PIPE)
#proc.stdin.write('From: <%s>\r\n' % sender)
proc.stdin.write('To: <%s>\r\n' % recipient)
proc.stdin.write('Message-ID: %s\r\n' % message_id)
proc.stdin.write(cms)
proc.communicate()
status = proc.returncode
if status == 0:
logging.info(
format_log_message(sender, recipient, message_id,
'sent (successful processing)', is_mdn))
else:
logging.warning(
format_log_message(sender, recipient, message_id,
'failed (sendmail error code: %s)' % status,
is_mdn))
return status
def find_certificate(addr, local_domain, algo):
#algorithms:
# 0 = hybrid
# 1 = address bound DNS CERT
# 2 = domain bound DNS CERT
# 3 = address bound LDAP
# 4 = domain bound LDAP
# 5 = stored in database
logging.debug('Try finding certificate for address: %s', addr)
parts = addr.partition('@')
user = parts[0]
domain = parts[2]
if algo == 1 or algo == 0:
logging.debug('Trying address bound DNS CERT')
certs = certdisco.dns_cert(user + '.' + domain)
if certs != []:
for cert in certs:
if certvld.validate(cert, local_domain, addr, domain, addressBound = True):
logging.debug('A valid address bound DNS CERT was found')
return cert
logging.debug('No valid address bound DNS CERT found')
return None
logging.debug('No address bound DNS CERT found')
if algo == 2 or algo == 0:
logging.debug('Trying domain bound DNS CERT')
certs = certdisco.dns_cert(domain)
if certs != []:
for cert in certs:
if certvld.validate(cert, local_domain, addr, domain, addressBound = False):
logging.debug('A valid domain bound DNS CERT was found')
return cert
logging.debug('No valid domain bound DNS CERT found')
return None
logging.debug('No domain bound DNS CERT found')
if algo == 3 or algo == 0:
logging.debug('Trying address bound LDAP')
uris = certdisco.dns_srv(domain)
for uri in uris:
certs = certdisco.ldap_qry(uri, addr)
if certs != []:
for cert in certs:
if certvld.validate(cert, local_domain, addr, domain, addressBound = True):
logging.debug('A valid address bound LDAP was found using uri: ' + uri)
return cert
logging.debug('No valid address bound LDAP found using uri: ' + uri)
return None
logging.debug('No address bound LDAP found using uri: ' + uri)
logging.debug('No address bound LDAP found')
if algo == 4 or algo == 0:
logging.debug('Trying domain bound LDAP')
uris = certdisco.dns_srv(domain)
for uri in uris:
certs = certdisco.ldap_qry(uri, domain)
if certs != []:
for cert in certs:
if certvld.validate(cert, local_domain, addr, domain, addressBound = False):
logging.debug('A valid domain bound LDAP was found using uri: ' + uri)
return cert
logging.debug('No valid domain bound LDAP found using uri: ' + uri)
return None
logging.debug('No domain bound LDAP found using uri: ' + uri)
logging.debug('No domain bound LDAP found')
return None
