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https://github.com/Mailu/Mailu.git
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115 lines
4.0 KiB
Python
115 lines
4.0 KiB
Python
from mailu import models
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from flask import current_app as app
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import re
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import urllib
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import ipaddress
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import socket
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import tenacity
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SUPPORTED_AUTH_METHODS = ["none", "plain"]
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STATUSES = {
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"authentication": ("Authentication credentials invalid", {
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"imap": "AUTHENTICATIONFAILED",
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"smtp": "535 5.7.8",
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"pop3": "-ERR Authentication failed"
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}),
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}
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def handle_authentication(headers):
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""" Handle an HTTP nginx authentication request
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See: http://nginx.org/en/docs/mail/ngx_mail_auth_http_module.html#protocol
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"""
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method = headers["Auth-Method"]
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protocol = headers["Auth-Protocol"]
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# Incoming mail, no authentication
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if method == "none" and protocol == "smtp":
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server, port = get_server(headers["Auth-Protocol"], False)
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return {
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"Auth-Status": "OK",
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"Auth-Server": server,
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"Auth-Port": port
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}
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# Authenticated user
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elif method == "plain":
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server, port = get_server(headers["Auth-Protocol"], True)
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# According to RFC2616 section 3.7.1 and PEP 3333, HTTP headers should
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# be ASCII and are generally considered ISO8859-1. However when passing
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# the password, nginx does not transcode the input UTF string, thus
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# we need to manually decode.
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raw_user_email = urllib.parse.unquote(headers["Auth-User"])
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user_email = raw_user_email.encode("iso8859-1").decode("utf8")
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raw_password = urllib.parse.unquote(headers["Auth-Pass"])
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password = raw_password.encode("iso8859-1").decode("utf8")
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ip = urllib.parse.unquote(headers["Client-Ip"])
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user = models.User.query.get(user_email)
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status = False
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if user:
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for token in user.tokens:
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if (token.check_password(password) and
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(not token.ip or token.ip == ip)):
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status = True
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if user.check_password(password):
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status = True
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if status:
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if protocol == "imap" and not user.enable_imap:
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status = False
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elif protocol == "pop3" and not user.enable_pop:
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status = False
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if status and user.enabled:
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return {
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"Auth-Status": "OK",
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"Auth-Server": server,
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"Auth-Port": port
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}
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else:
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status, code = get_status(protocol, "authentication")
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return {
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"Auth-Status": status,
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"Auth-Error-Code": code,
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"Auth-Wait": 0
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}
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# Unexpected
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return {}
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def get_status(protocol, status):
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""" Return the proper error code depending on the protocol
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"""
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status, codes = STATUSES[status]
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return status, codes[protocol]
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def extract_host_port(host_and_port, default_port):
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host, _, port = re.match('^(.*?)(:([0-9]*))?$', host_and_port).groups()
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return host, int(port) if port else default_port
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def get_server(protocol, authenticated=False):
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if protocol == "imap":
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hostname, port = extract_host_port(app.config['IMAP_ADDRESS'], 143)
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elif protocol == "pop3":
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hostname, port = extract_host_port(app.config['POP3_ADDRESS'], 110)
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elif protocol == "smtp":
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if authenticated:
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hostname, port = extract_host_port(app.config['AUTHSMTP_ADDRESS'], 10025)
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else:
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hostname, port = extract_host_port(app.config['SMTP_ADDRESS'], 25)
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try:
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# test if hostname is already resolved to an ip adddress
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ipaddress.ip_address(hostname)
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except:
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# hostname is not an ip address - so we need to resolve it
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hostname = resolve_hostname(hostname)
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return hostname, port
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@tenacity.retry(stop=tenacity.stop_after_attempt(100),
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wait=tenacity.wait_random(min=2, max=5))
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def resolve_hostname(hostname):
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""" This function uses system DNS to resolve a hostname.
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It is capable of retrying in case the host is not immediately available
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"""
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return socket.gethostbyname(hostname)
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