132 lines
4.6 KiB
Python
132 lines
4.6 KiB
Python
#!/usr/bin/python
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from ConfigParser import RawConfigParser
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import email, os, smtplib, sys, traceback, markdown, syslog, requests
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from M2Crypto import BIO, Rand, SMIME, X509
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from email.mime.text import MIMEText
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from email.mime.multipart import MIMEMultipart
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# Read configuration from /etc/gpg-mailgate.conf
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_cfg = RawConfigParser()
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_cfg.read('/etc/gpg-mailgate.conf')
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cfg = dict()
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for sect in _cfg.sections():
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cfg[sect] = dict()
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for (name, value) in _cfg.items(sect):
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cfg[sect][name] = value
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def log(msg):
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if cfg.has_key('logging') and cfg['logging'].has_key('file'):
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if cfg['logging']['file'] == "syslog":
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syslog.syslog(syslog.LOG_INFO | syslog.LOG_MAIL, msg)
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else:
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logfile = open(cfg['logging']['file'], 'a')
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logfile.write(msg + "\n")
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logfile.close()
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CERT_PATH = cfg['smime']['cert_path']+"/"
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def send_msg( message, from_addr, recipients = None ):
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if 'relay' in cfg and 'host' in cfg['relay'] and 'enc_port' in cfg['relay']:
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relay = (cfg['relay']['host'], int(cfg['relay']['enc_port']))
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smtp = smtplib.SMTP(relay[0], relay[1])
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smtp.sendmail( from_addr, recipients, message.as_string() )
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else:
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log("Could not send mail due to wrong configuration")
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if __name__ == "__main__":
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# try:
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# Read e-mail from stdin
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raw = sys.stdin.read()
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register_msg = email.message_from_string( raw )
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from_addr = email.utils.parseaddr(register_msg['From'])[1]
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sign_part = None
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for msg_part in register_msg.walk():
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if msg_part.get_content_type().lower() == "application/pkcs7-signature" or msg_part.get_content_type().lower() == "application/x-pkcs7-signature":
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sign_type = 'smime'
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sign_part = msg_part
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break
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# This may cause that a non ASCII-armored key will be seen as valid. Other solution is not that efficient though
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#elif msg_part.get_content_type().lower() == "application/pgp-keys":
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# sign_type = 'pgp'
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# sign_part = msg_part.get_payload()
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# break
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elif "-----BEGIN PGP PUBLIC KEY BLOCK-----" in msg_part.get_payload() and "-----END PGP PUBLIC KEY BLOCK-----" in msg_part.get_payload():
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msg_content = msg_part.get_payload()
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start = msg_content.find("-----BEGIN PGP PUBLIC KEY BLOCK-----")
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end = msg_content.find("-----END PGP PUBLIC KEY BLOCK-----")
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sign_type = 'pgp'
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sign_part = msg_content[start:end + 34]
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break
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if sign_part == None:
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log("Unable to find PKCS7 signature or public PGP key in registration email")
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failure_msg = file( cfg['mailregister']['mail_templates'] + "/registrationError.md").read()
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msg = MIMEMultipart("alternative")
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msg["From"] = cfg['mailregister']['register_email']
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msg["To"] = from_addr
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msg["Subject"] = "S/MIME / OpenPGP registration failed"
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msg.attach(MIMEText(failure_msg, 'plain'))
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msg.attach(MIMEText(markdown.markdown(failure_msg), 'html'))
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send_msg(msg, cfg['mailregister']['register_email'], [from_addr])
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sys.exit(0)
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if sign_type == 'smime':
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raw_sig = sign_part.get_payload().replace("\n","")
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# re-wrap signature so that it fits base64 standards
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cooked_sig = '\n'.join(raw_sig[pos:pos+76] for pos in xrange(0, len(raw_sig), 76))
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# now, wrap the signature in a PKCS7 block
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sig = """
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-----BEGIN PKCS7-----
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%s
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-----END PKCS7-----
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""" % cooked_sig
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# and load it into an SMIME p7 object through the BIO I/O buffer:
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buf = BIO.MemoryBuffer(sig)
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p7 = SMIME.load_pkcs7_bio(buf)
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sk = X509.X509_Stack()
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signers = p7.get0_signers(sk)
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signing_cert = signers[0]
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#Save certificate compatible to RFC 2821
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splitted_from_addr = from_addr.split('@')
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processed_from_addr = splitted_from_addr[0] + '@' + splitted_from_addr[1].lower()
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signing_cert.save(os.path.join(CERT_PATH, processed_from_addr))
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# format in user-specific data
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# sending success mail only for S/MIME as GPGMW handles this on its own
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success_msg = file(cfg['mailregister']['mail_templates']+"/registrationSuccess.md").read()
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success_msg = success_msg.replace("[:FROMADDRESS:]",from_addr)
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msg = MIMEMultipart("alternative")
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msg["From"] = cfg['mailregister']['register_email']
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msg["To"] = from_addr
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msg["Subject"] = "S/MIME certificate registration succeeded"
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msg.attach(MIMEText(success_msg, 'plain'))
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msg.attach(MIMEText(markdown.markdown(success_msg), 'html'))
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send_msg(msg, cfg['mailregister']['register_email'], [from_addr])
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log("S/MIME Registration succeeded")
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elif sign_type == 'pgp':
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# send POST to gpg-mailgate webpanel
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sig = sign_part
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payload = {'email': from_addr, 'key': sig}
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r = requests.post(cfg['mailregister']['webpanel_url'], data=payload)
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log("PGP registration is handed over to GPGMW")
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# except:
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# log("Registration exception")
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# sys.exit(0)
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