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a183a9b174
This PR adds support for negotiating IMAP, SMTP & HTTP on the configured HTTPS port using TLS ALPN. This is intended to be useful for deploying Mox as a chatmail server. The upstream implementation of chatmail servers uses `imap` and `smtp` as the “next protocol” values for IMAP and SMTP, respectively: https://github.com/deltachat/chatmail/blob/main/cmdeploy/src/cmdeploy/nginx/nginx.conf.j2#L16-L17 To test, configure Mox as is standard for the `mox localserve` mode, but add this block under `Listeners.local`: ```sconf AutoconfigHTTPS: Enabled: true Port: 1443 ``` Then run Mox and use OpenSSL’s s_client mode to connect to the local instance: ``` > openssl s_client -quiet -connect localhost:1443 -alpn smtp depth=0 O = mox localserve, CN = localhost verify error:num=18:self signed certificate verify return:1 depth=0 O = mox localserve, CN = localhost verify return:1 220 localhost ESMTP mox 7f5e1087d42d5d7bf57649c5c6a2155c3706ce39+modifications HELO test 550 5.5.0 your ehlo domain does not resolve to an IP address (htqp11_GJOmHEhSs_Y03eg) QUIT 221 2.0.0 okay thanks bye ^C > openssl s_client -quiet -crlf -connect localhost:1443 -alpn imap depth=0 O = mox localserve, CN = localhost verify error:num=18:self signed certificate verify return:1 depth=0 O = mox localserve, CN = localhost verify return:1 * OK [CAPABILITY IMAP4rev2 IMAP4rev1 ENABLE LITERAL+ IDLE SASL-IR BINARY UNSELECT UIDPLUS ESEARCH SEARCHRES MOVE UTF8=ACCEPT LIST-EXTENDED SPECIAL-USE LIST-STATUS AUTH=SCRAM-SHA-256-PLUS AUTH=SCRAM-SHA-256 AUTH=SCRAM-SHA-1-PLUS AUTH=SCRAM-SHA-1 AUTH=CRAM-MD5 ID APPENDLIMIT=9223372036854775807 CONDSTORE QRESYNC STATUS=SIZE QUOTA QUOTA=RES-STORAGE AUTH=PLAIN] mox imap c1 STARTTLS c1 BAD STARTTLS unrecognized syntax/command: tls already active ^C > openssl s_client -quiet -crlf -connect localhost:1443 depth=0 O = mox localserve, CN = localhost verify error:num=18:self signed certificate verify return:1 depth=0 O = mox localserve, CN = localhost verify return:1 GET / HTTP/1.1 Host: localhost HTTP/1.1 404 Not Found Content-Type: text/plain; charset=utf-8 X-Content-Type-Options: nosniff Date: Mon, 25 Nov 2024 07:28:00 GMT Content-Length: 19 404 page not found ^C ``` As part of this change, I had to `go get golang.org/x/net/http2`. (The default `http.Server` supports HTTP2 if you leave it alone, but that built-in support is deactivated if I set `TLSNextProto` to a non-nil value. To ensure that Mox continues to support HTTP2, [the Go documentation](https://pkg.go.dev/net/http@go1.23.3#hdr-HTTP_2) directs folks with "…more complex configurations…" to import x/net/http2.) Go decided that it also wanted to update a bunch of other dependencies while it was at it. This has caused the large number of dependency updates. I can revert these and attempt a more surgical addition of the http2 library, if you’d like. There are also two major deficiencies in this code that I’d like advice on correcting: 1. Right now, this ALPN feature is enabled when Mox is configured to provide Autoconfigure services to mail clients. I chose to do this because it was relatively straightforward to implement. However, the resulting behavior is extremely non-obvious. **How would you recommend exposing the ALPN feature in the configuration?** 2. I’m not sure what the best way to expose the private `serve()` functions in `imapserver` and `smtpserver` are. The current implementation creates a public function called `ServeConn()` in each module that just calls the private `serve()` function with all the same arguments, but this feels redundant. **Would you recommend making the `serve()` functions public, using public wrappers but with a more limited set of parameters, or something else entirely?** Thanks! |
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| alias_test.go | ||
| alignment.go | ||
| analyze.go | ||
| dnsbl.go | ||
| dsn.go | ||
| error.go | ||
| fuzz_test.go | ||
| limitwriter.go | ||
| mx.go | ||
| parse.go | ||
| parse_test.go | ||
| rejects.go | ||
| reputation.go | ||
| reputation_test.go | ||
| server.go | ||
| server_test.go | ||