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assume a dns cname record mail.<domain>, pointing to the hostname of the mail server, for clients to connect to

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the autoconfig/autodiscover endpoints, and the printed client settings (in
quickstart, in the admin interface) now all point to the cname record (called
"client settings domain"). it is configurable per domain, and set to
"mail.<domain>" by default. for existing mox installs, the domain can be added
by editing the config file.

this makes it easier for a domain to migrate to another server in the future.
client settings don't have to be updated, the cname can just be changed.
before, the hostname of the mail server was configured in email clients.
migrating away would require changing settings in all clients.

if a client settings domain is configured, a TLS certificate for the name will
be requested through ACME, or must be configured manually.
This commit is contained in:
Mechiel Lukkien
2023-12-24 11:01:16 +01:00
parent e7478ed6ac
commit da3ed38a5c
8 changed files with 80 additions and 9 deletions
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29
mox-/admin.go
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@ -250,6 +250,7 @@ func MakeDomainConfig(ctx context.Context, domain, hostname dns.Domain, accountN
confDKIM.Sign = []string{year + "a", year + "b"}
confDomain := config.Domain{
ClientSettingsDomain: "mail." + domain.Name(),
LocalpartCatchallSeparator: "+",
DKIM: confDKIM,
DMARC: &config.DMARC{
@ -653,6 +654,16 @@ func DomainRecords(domConf config.Domain, domain dns.Domain, hasDNSSEC bool, cer
)
}
if domConf.ClientSettingsDomain != "" && domConf.ClientSettingsDNSDomain != Conf.Static.HostnameDomain {
records = append(records,
"; Client settings will reference a subdomain of the hosted domain, making it",
"; easier to migrate to a different server in the future by not requiring settings",
"; in all clients to be updated.",
fmt.Sprintf(`%-*s CNAME %s.`, 20+len(d), domConf.ClientSettingsDNSDomain.ASCII+".", h),
"",
)
}
records = append(records,
"; Autoconfig is used by Thunderbird. Autodiscover is (in theory) used by Microsoft.",
fmt.Sprintf(`autoconfig.%s. CNAME %s.`, d, h),
@ -694,8 +705,13 @@ func DomainRecords(domConf config.Domain, domain dns.Domain, hasDNSSEC bool, cer
"; Or alternatively only limit for email-specific subdomains, so you can use",
"; other accounts/methods for other subdomains.",
fmt.Sprintf(`;; autoconfig.%s. CAA 0 issue "%s; accounturi=%s; validationmethods=tls-alpn-01,http-01"`, d, certIssuerDomainName, acmeAccountURI),
fmt.Sprintf(`;; mtasts.%s. CAA 0 issue "%s; accounturi=%s; validationmethods=tls-alpn-01,http-01"`, d, certIssuerDomainName, acmeAccountURI),
fmt.Sprintf(`;; mta-sts.%s. CAA 0 issue "%s; accounturi=%s; validationmethods=tls-alpn-01,http-01"`, d, certIssuerDomainName, acmeAccountURI),
)
if domConf.ClientSettingsDomain != "" && domConf.ClientSettingsDNSDomain != Conf.Static.HostnameDomain {
records = append(records,
fmt.Sprintf(`;; %-*s CAA 0 issue "%s; accounturi=%s; validationmethods=tls-alpn-01,http-01"`, 20-3+len(d), domConf.ClientSettingsDNSDomain.ASCII, certIssuerDomainName, acmeAccountURI),
)
}
if strings.HasSuffix(h, "."+d) {
records = append(records,
";",
@ -1077,7 +1093,8 @@ type ClientConfig struct {
func ClientConfigDomain(d dns.Domain) (rconfig ClientConfig, rerr error) {
var haveIMAP, haveSubmission bool
if _, ok := Conf.Domain(d); !ok {
domConf, ok := Conf.Domain(d)
if !ok {
return ClientConfig{}, fmt.Errorf("unknown domain")
}
@ -1086,6 +1103,9 @@ func ClientConfigDomain(d dns.Domain) (rconfig ClientConfig, rerr error) {
if l.Hostname != "" {
host = l.HostnameDomain
}
if domConf.ClientSettingsDomain != "" {
host = domConf.ClientSettingsDNSDomain
}
if !haveIMAP && l.IMAPS.Enabled {
rconfig.IMAP.Host = host
rconfig.IMAP.Port = config.Port(l.IMAPS.Port, 993)
@ -1153,7 +1173,7 @@ type ClientConfigsEntry struct {
// ClientConfigsDomain returns the client configs for IMAP/Submission for a
// domain.
func ClientConfigsDomain(d dns.Domain) (ClientConfigs, error) {
_, ok := Conf.Domain(d)
domConf, ok := Conf.Domain(d)
if !ok {
return ClientConfigs{}, fmt.Errorf("unknown domain")
}
@ -1185,6 +1205,9 @@ func ClientConfigsDomain(d dns.Domain) (ClientConfigs, error) {
if l.Hostname != "" {
host = l.HostnameDomain
}
if domConf.ClientSettingsDomain != "" {
host = domConf.ClientSettingsDNSDomain
}
if l.Submissions.Enabled {
c.Entries = append(c.Entries, ClientConfigsEntry{"Submission (SMTP)", host, config.Port(l.Submissions.Port, 465), name, "with TLS"})
}