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added lmtp: prefix and documentation

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This commit is contained in:
Alexander Graf
2021-06-16 16:19:31 +02:00
parent b55b53b781
commit a1fd44fced
2 changed files with 101 additions and 77 deletions
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39
core/admin/mailu/internal/views/postfix.py
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@ -36,15 +36,23 @@ def postfix_alias_map(alias):
def postfix_transport(email):
if email == '*' or re.match("(^|.*@)\[.*\]$", email):
return flask.abort(404)
localpart, domain_name = models.Email.resolve_domain(email)
_, domain_name = models.Email.resolve_domain(email)
relay = models.Relay.query.get(domain_name) or flask.abort(404)
target = relay.smtp.lower()
port = None
if use_mx := target.startswith('mx:'):
use_lmtp = False
use_mx = False
# strip prefixes mx: and lmtp:
if target.startswith('mx:'):
target = target[3:]
use_mx = True
elif target.startswith('lmtp:'):
target = target[5:]
use_lmtp = True
# split host:port or [host]:port
if target.startswith('['):
if use_mx or ']' not in target:
# invalid target (mx: and [])
# invalid target (mx: and [] or missing ])
flask.abort(400)
host, rest = target[1:].split(']', 1)
if rest.startswith(':'):
@ -57,29 +65,38 @@ def postfix_transport(email):
host, port = target.rsplit(':', 1)
else:
host = target
# default for empty host part is mx:domain
if not host:
host = relay.name.lower()
use_mx = True
if not use_lmtp:
host = relay.name.lower()
use_mx = True
else:
# lmtp: needs a host part
flask.abort(400)
# detect ipv6 address or encode host
if ':' in host:
host = f'ipv6:{host}'
else:
try:
host = idna.encode(host).decode('ascii')
except idna.IDNAError:
# invalid target (fqdn not encodable)
# invalid host (fqdn not encodable)
flask.abort(400)
# validate port
if port is not None:
try:
port = int(port, 10)
if port == 25:
port = None
except ValueError:
# invalid target (port should be numeric)
# invalid port (should be numeric)
flask.abort(400)
if not use_mx:
# create transport
transport = 'lmtp' if use_lmtp else 'smtp'
# use [] when not using MX lookups or host is an ipv6 address
if host.startswith('ipv6:') or (not use_lmtp and not use_mx):
host = f'[{host}]'
# create port suffix
port = '' if port is None else f':{port}'
return flask.jsonify(f'smtp:{host}{port}')
return flask.jsonify(f'{transport}:{host}{port}')
@internal.route("/postfix/recipient/map/<path:recipient>")