infrastructure/mox
1
0
Fork 0
mirror of https://github.com/mjl-/mox.git synced 2025-07-10 07:54:40 +03:00
Code Issues Packages Projects Releases Wiki Activity

Add support for negotiating IMAP and SMTP on the HTTPS port 443 using TLS ALPN "imap" and "smtp"

Browse Source 
Intended for future use with chatmail servers. Standard email ports may be
blocked on some networks, while the HTTPS port may be accessible.

This is a squashed commit of PR #255 by s0ph0s-dog.
This commit is contained in:
s0ph0s
2025-01-23 11:13:06 +01:00
committed by Mechiel Lukkien
parent 0203dfa9d9
commit 3c77e076e2
49 changed files with 14832 additions and 86 deletions
Download Patch File Download Diff File Expand all files Collapse all files

26
imapserver/server.go
View File

@ -169,6 +169,7 @@ type conn struct {
state state
conn net.Conn
tls bool // Whether TLS has been initialized.
viaHTTPS bool // Whether this connection came in via HTTPS (using TLS ALPN).
br *bufio.Reader // From remote, with TLS unwrapped in case of TLS.
line chan lineErr // If set, instead of reading from br, a line is read from this channel. For reading a line in IDLE while also waiting for mailbox/account updates.
lastLine string // For detecting if syntax error is fatal, i.e. if this ends with a literal. Without crlf.
@ -380,13 +381,18 @@ func listen1(protocol, listenerName, ip string, port int, tlsConfig *tls.Config,
}
metricIMAPConnection.WithLabelValues(protocol).Inc()
go serve(listenerName, mox.Cid(), tlsConfig, conn, xtls, noRequireSTARTTLS)
go serve(listenerName, mox.Cid(), tlsConfig, conn, xtls, noRequireSTARTTLS, false)
}
}
servers = append(servers, serve)
}
// ServeTLSConn serves IMAP on a TLS connection.
func ServeTLSConn(listenerName string, conn *tls.Conn, tlsConfig *tls.Config) {
serve(listenerName, mox.Cid(), tlsConfig, conn, true, false, true)
}
// Serve starts serving on all listeners, launching a goroutine per listener.
func Serve() {
for _, serve := range servers {
@ -635,7 +641,7 @@ func (c *conn) xhighestModSeq(tx *bstore.Tx, mailboxID int64) store.ModSeq {
var cleanClose struct{} // Sentinel value for panic/recover indicating clean close of connection.
func serve(listenerName string, cid int64, tlsConfig *tls.Config, nc net.Conn, xtls, noRequireSTARTTLS bool) {
func serve(listenerName string, cid int64, tlsConfig *tls.Config, nc net.Conn, xtls, noRequireSTARTTLS, viaHTTPS bool) {
var remoteIP net.IP
if a, ok := nc.RemoteAddr().(*net.TCPAddr); ok {
remoteIP = a.IP
@ -648,6 +654,7 @@ func serve(listenerName string, cid int64, tlsConfig *tls.Config, nc net.Conn, x
cid: cid,
conn: nc,
tls: xtls,
viaHTTPS: viaHTTPS,
lastlog: time.Now(),
baseTLSConfig: tlsConfig,
remoteIP: remoteIP,
@ -680,10 +687,14 @@ func serve(listenerName string, cid int64, tlsConfig *tls.Config, nc net.Conn, x
// Many IMAP connections use IDLE to wait for new incoming messages. We'll enable
// keepalive to get a higher chance of the connection staying alive, or otherwise
// detecting broken connections early.
if tcpconn, ok := c.conn.(*net.TCPConn); ok {
if err := tcpconn.SetKeepAlivePeriod(5 * time.Minute); err != nil {
tcpconn := c.conn
if viaHTTPS {
tcpconn = nc.(*tls.Conn).NetConn()
}
if tc, ok := tcpconn.(*net.TCPConn); ok {
if err := tc.SetKeepAlivePeriod(5 * time.Minute); err != nil {
c.log.Errorx("setting keepalive period", err)
} else if err := tcpconn.SetKeepAlive(true); err != nil {
} else if err := tc.SetKeepAlive(true); err != nil {
c.log.Errorx("enabling keepalive", err)
}
}
@ -692,6 +703,7 @@ func serve(listenerName string, cid int64, tlsConfig *tls.Config, nc net.Conn, x
slog.Any("remote", c.conn.RemoteAddr()),
slog.Any("local", c.conn.LocalAddr()),
slog.Bool("tls", xtls),
slog.Bool("viahttps", viaHTTPS),
slog.String("listener", listenerName))
defer func() {
@ -717,7 +729,7 @@ func serve(listenerName string, cid int64, tlsConfig *tls.Config, nc net.Conn, x
}
}()
if xtls {
if xtls && !viaHTTPS {
// Start TLS on connection. We perform the handshake explicitly, so we can set a
// timeout, do client certificate authentication, log TLS details afterwards.
c.xtlsHandshakeAndAuthenticate(c.conn)
@ -1554,7 +1566,7 @@ func (c *conn) capabilities() string {
} else {
caps += " LOGINDISABLED"
}
if c.tls && len(c.conn.(*tls.Conn).ConnectionState().PeerCertificates) > 0 {
if c.tls && len(c.conn.(*tls.Conn).ConnectionState().PeerCertificates) > 0 && !c.viaHTTPS {
caps += " AUTH=EXTERNAL"
}
return caps