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change mox to start as root, bind to network sockets, then drop to regular unprivileged mox user

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makes it easier to run on bsd's, where you cannot (easily?) let non-root users
bind to ports <1024. starting as root also paves the way for future improvements
with privilege separation.

unfortunately, this requires changes to how you start mox. though mox will help
by automatically fix up dir/file permissions/ownership.

if you start mox from the systemd unit file, you should update it so it starts
as root and adds a few additional capabilities:

        # first update the mox binary, then, as root:
        ./mox config printservice >mox.service
        systemctl daemon-reload
        systemctl restart mox
        journalctl -f -u mox &
        # you should see mox start up, with messages about fixing permissions on dirs/files.

if you used the recommended config/ and data/ directory, in a directory just for
mox, and with the mox user called "mox", this should be enough.

if you don't want mox to modify dir/file permissions, set "NoFixPermissions:
true" in mox.conf.

if you named the mox user something else than mox, e.g. "_mox", add "User: _mox"
to mox.conf.

if you created a shared service user as originally suggested, you may want to
get rid of that as it is no longer useful and may get in the way. e.g. if you
had /home/service/mox with a "service" user, that service user can no longer
access any files: only mox and root can.

this also adds scripts for building mox docker images for alpine-supported
platforms.

the "restart" subcommand has been removed. it wasn't all that useful and got in
the way.

and another change: when adding a domain while mtasts isn't enabled, don't add
the per-domain mtasts config, as it would cause failure to add the domain.

based on report from setting up mox on openbsd from mteege.
and based on issue #3. thanks for the feedback!
This commit is contained in:
Mechiel Lukkien
2023-02-27 12:19:55 +01:00
parent eda907fc86
commit 92e018e463
37 changed files with 841 additions and 435 deletions
Download Patch File Download Diff File Expand all files Collapse all files

57
imapserver/server.go
View File

@ -300,8 +300,8 @@ func (c *conn) xsanity(err error, format string, args ...any) {
type msgseq uint32
// ListenAndServe starts all imap listeners for the configuration, in new goroutines.
func ListenAndServe() {
// Listen initializes all imap listeners for the configuration, and stores them for Serve to start them.
func Listen() {
for name, listener := range mox.Conf.Static.Listeners {
var tlsConfig *tls.Config
if listener.TLS != nil {
@ -311,44 +311,57 @@ func ListenAndServe() {
if listener.IMAP.Enabled {
port := config.Port(listener.IMAP.Port, 143)
for _, ip := range listener.IPs {
go listenServe("imap", name, ip, port, tlsConfig, false, listener.IMAP.NoRequireSTARTTLS)
listen1("imap", name, ip, port, tlsConfig, false, listener.IMAP.NoRequireSTARTTLS)
}
}
if listener.IMAPS.Enabled {
port := config.Port(listener.IMAPS.Port, 993)
for _, ip := range listener.IPs {
go listenServe("imaps", name, ip, port, tlsConfig, true, false)
listen1("imaps", name, ip, port, tlsConfig, true, false)
}
}
}
}
func listenServe(protocol, listenerName, ip string, port int, tlsConfig *tls.Config, xtls, noRequireSTARTTLS bool) {
var servers []func()
func listen1(protocol, listenerName, ip string, port int, tlsConfig *tls.Config, xtls, noRequireSTARTTLS bool) {
addr := net.JoinHostPort(ip, fmt.Sprintf("%d", port))
xlog.Print("listening for imap", mlog.Field("listener", listenerName), mlog.Field("addr", addr), mlog.Field("protocol", protocol))
if os.Getuid() == 0 {
xlog.Print("listening for imap", mlog.Field("listener", listenerName), mlog.Field("addr", addr), mlog.Field("protocol", protocol))
}
network := mox.Network(ip)
var ln net.Listener
var err error
if xtls {
ln, err = tls.Listen(network, addr, tlsConfig)
} else {
ln, err = net.Listen(network, addr)
}
ln, err := mox.Listen(network, addr)
if err != nil {
xlog.Fatalx("imap: listen for imap"+mox.LinuxSetcapHint(err), err, mlog.Field("protocol", protocol), mlog.Field("listener", listenerName))
xlog.Fatalx("imap: listen for imap", err, mlog.Field("protocol", protocol), mlog.Field("listener", listenerName))
}
if xtls {
ln = tls.NewListener(ln, tlsConfig)
}
for {
conn, err := ln.Accept()
if err != nil {
xlog.Infox("imap: accept", err, mlog.Field("protocol", protocol), mlog.Field("listener", listenerName))
continue
serve := func() {
for {
conn, err := ln.Accept()
if err != nil {
xlog.Infox("imap: accept", err, mlog.Field("protocol", protocol), mlog.Field("listener", listenerName))
continue
}
metricIMAPConnection.WithLabelValues(protocol).Inc()
go serve(listenerName, mox.Cid(), tlsConfig, conn, xtls, noRequireSTARTTLS)
}
metricIMAPConnection.WithLabelValues(protocol).Inc()
go serve(listenerName, mox.Cid(), tlsConfig, conn, xtls, noRequireSTARTTLS)
}
servers = append(servers, serve)
}
// Serve starts serving on all listeners, launching a goroutine per listener.
func Serve() {
for _, serve := range servers {
go serve()
}
servers = nil
}
// returns whether this connection accepts utf-8 in strings.