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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
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17
integration_test.go
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@ -43,11 +43,15 @@ func TestDeliver(t *testing.T) {
mox.Shutdown, mox.ShutdownCancel = context.WithCancel(context.Background())
// Remove state.
os.RemoveAll("testdata/integration/run")
os.MkdirAll("testdata/integration/run", 0750)
os.RemoveAll("testdata/integration/data")
os.MkdirAll("testdata/integration/data", 0750)
// Cleanup afterwards, these are owned by root, annoying to have around due to
// permission errors.
defer os.RemoveAll("testdata/integration/data")
// Load mox config.
mox.ConfigStaticPath = "testdata/integration/mox.conf"
mox.ConfigStaticPath = "testdata/integration/config/mox.conf"
filepath.Join(filepath.Dir(mox.ConfigStaticPath), "domains.conf")
if errs := mox.LoadConfig(mox.Context); len(errs) > 0 {
t.Fatalf("loading mox config: %v", errs)
@ -69,14 +73,15 @@ func TestDeliver(t *testing.T) {
createAccount("moxtest3@mox3.example", "pass1234")
// Start mox.
mtastsdbRefresher := false
err := start(mtastsdbRefresher)
const mtastsdbRefresher = false
const skipForkExec = true
err := start(mtastsdbRefresher, skipForkExec)
tcheck(t, err, "starting mox")
// todo: we should probably hook store.Comm to get updates.
latestMsgID := func(username string) int64 {
// We open the account index database created by mox for the test user. And we keep looking for the email we sent.
dbpath := fmt.Sprintf("testdata/integration/run/accounts/%s/index.db", username)
dbpath := fmt.Sprintf("testdata/integration/data/accounts/%s/index.db", username)
db, err := bstore.Open(dbpath, &bstore.Options{Timeout: 3 * time.Second}, store.Message{}, store.Recipient{}, store.Mailbox{}, store.Password{})
if err != nil && errors.Is(err, bolt.ErrTimeout) {
log.Printf("db open timeout (normal delay for new sender with account and db file kept open)")