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https://github.com/zulip/zulip.git
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1f0cfd4662
Using postfix to handle the incoming email gateway complicates things a great deal: - It cannot verify that incoming email addresses exist in Zulip before accepting them; it thus accepts mail at the `RCPT TO` stage which it cannot handle, and thus must reject after the `DATA`. - It is built to handle both incoming and outgoing email, which results in subtle errors (1c17583ad5,79931051bd,a53092687e, #18600). - Rate-limiting happens much too late to avoid denial of service (#12501). - Mis-configurations of the HTTP endpoint can break incoming mail (#18105). Provide a replacement SMTP server which accepts incoming email on port 25, verifies that Zulip can accept the address, and that no rate-limits are being broken, and then adds it directly to the relevant queue. Removes an incorrect comment which implied that missed-message addresses were only usable once. We leave rate-limiting to only channel email addresses, since missed-message addresses are unlikely to be placed into automated systems, as channel email addresses are. Also simplifies #7814 somewhat.
74 lines
2.6 KiB
Python
74 lines
2.6 KiB
Python
import os
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import ssl
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from typing import Any
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from urllib.parse import SplitResult
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from django.core.management.base import BaseCommand, CommandParser
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from typing_extensions import override
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from zerver.lib.email_mirror_server import run_smtp_server
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class Command(BaseCommand):
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help = """SMTP server to ingest incoming emails"""
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@override
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def add_arguments(self, parser: CommandParser) -> None:
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parser.add_argument(
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"--listen", help="[Port, or address:port, to bind HTTP server to]", default="0.0.0.0:25"
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)
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parser.add_argument(
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"--user",
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help="User to drop privileges to, if started as root.",
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type=str,
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required=(os.geteuid() == 0),
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)
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parser.add_argument(
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"--group",
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help="Group to drop privileges to, if started as root.",
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type=str,
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required=(os.geteuid() == 0),
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)
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tls_cert: str | None = None
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tls_key: str | None = None
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if os.access("/etc/ssl/certs/zulip.combined-chain.crt", os.R_OK) and os.access(
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"/etc/ssl/private/zulip.key", os.R_OK
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):
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tls_cert = "/etc/ssl/certs/zulip.combined-chain.crt"
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tls_key = "/etc/ssl/private/zulip.key"
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elif os.access("/etc/ssl/certs/ssl-cert-snakeoil.pem", os.R_OK) and os.access(
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"/etc/ssl/private/ssl-cert-snakeoil.key", os.R_OK
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):
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tls_cert = "/etc/ssl/certs/ssl-cert-snakeoil.pem"
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tls_key = "/etc/ssl/private/ssl-cert-snakeoil.key"
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parser.add_argument(
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"--tls-cert",
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help="Path to TLS certificate chain file",
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type=str,
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default=tls_cert,
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)
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parser.add_argument(
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"--tls-key",
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help="Path to TLS private key file",
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type=str,
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default=tls_key,
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)
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@override
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def handle(self, *args: Any, **options: Any) -> None:
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listen = options["listen"]
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if listen.isdigit():
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host, port = "0.0.0.0", int(listen) # noqa: S104
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else:
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r = SplitResult("", listen, "", "", "")
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if r.port is None:
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raise RuntimeError(f"{listen!r} does not have a valid port number.")
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host, port = r.hostname or "0.0.0.0", r.port # noqa: S104
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if options["tls_cert"] and options["tls_key"]:
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tls_context = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH)
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tls_context.load_cert_chain(options["tls_cert"], options["tls_key"])
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else:
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tls_context = None
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run_smtp_server(options["user"], options["group"], host, port, tls_context)
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