mirror of
https://github.com/mail-in-a-box/mailinabox.git
synced 2024-11-24 02:37:05 +00:00
54 lines
1.9 KiB
Python
54 lines
1.9 KiB
Python
|
#!/usr/bin/python3
|
||
|
|
#
|
||
|
|
# This script implement's Dovecot's checkpassword authentication mechanism:
|
||
|
|
# http://wiki2.dovecot.org/AuthDatabase/CheckPassword?action=show&redirect=PasswordDatabase%2FCheckPassword
|
||
|
|
#
|
||
|
|
# This allows us to perform our own password validation, such as for two-factor authentication,
|
||
|
|
# which Dovecot does not have any native support for.
|
||
|
|
#
|
||
|
|
# We will issue an HTTP request to our management server to perform authentication.
|
||
|
|
|
||
|
|
import sys, os, urllib.request, base64, json, traceback
|
||
|
|
|
||
|
|
try:
|
||
|
|
# Read fd 3 which provides the username and password separated
|
||
|
|
# by NULLs and two other undocumented/empty fields.
|
||
|
|
creds = b''
|
||
|
|
while True:
|
||
|
|
b = os.read(3, 1024)
|
||
|
|
if len(b) == 0: break
|
||
|
|
creds += b
|
||
|
|
email, pw, dummy, dummy = creds.split(b'\x00')
|
||
|
|
|
||
|
|
# Call the management server's "/me" method with the
|
||
|
|
# provided credentials
|
||
|
|
req = urllib.request.Request('http://127.0.0.1:10222/me')
|
||
|
|
req.add_header(b'Authorization', b'Basic ' + base64.b64encode(email + b':' + pw))
|
||
|
|
response = urllib.request.urlopen(req)
|
||
|
|
|
||
|
|
# The response is always success and always a JSON object
|
||
|
|
# indicating the authentication result.
|
||
|
|
resp = response.read().decode('utf8')
|
||
|
|
resp = json.loads(resp)
|
||
|
|
if not isinstance(resp, dict): raise ValueError("Response is not a JSON object.")
|
||
|
|
|
||
|
|
except:
|
||
|
|
# Handle all exceptions. Print what happens (ends up in syslog, thanks
|
||
|
|
# to dovecot) and return an exit status that indicates temporary failure,
|
||
|
|
# which is passed on to the authenticating client.
|
||
|
|
traceback.print_exc()
|
||
|
|
print(json.dumps(dict(os.environ), indent=2), file=sys.stderr)
|
||
|
|
sys.exit(111)
|
||
|
|
|
||
|
|
if resp.get('status') != 'authorized':
|
||
|
|
# Indicates login failure.
|
||
|
|
# (sys.exit should not be inside the try block.)
|
||
|
|
sys.exit(1)
|
||
|
|
|
||
|
|
# Signal ok by executing the indicated process, per the Dovecot
|
||
|
|
# protocol. (Note that the second parameter is the 0th argument
|
||
|
|
# to the called process, which is required and is typically the
|
||
|
|
# file itself.)
|
||
|
|
os.execl(sys.argv[1], sys.argv[1])
|
||
|
|
|