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webadmin: make remaining domain settings configurable via admin web interface

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for dmarc reporting address, tls reporting address, mtasts policy, dkim keys/selectors.

should make it easier for webadmin-using admins to discover these settings.

the webadmin interface is now on par with functionality you would set through
the configuration file, let's keep it that way.
This commit is contained in:
Mechiel Lukkien
2024-04-19 10:23:53 +02:00
parent a69887bfab
commit e702f45d32
11 changed files with 1836 additions and 100 deletions
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13
config/config.go
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@ -279,7 +279,7 @@ type Domain struct {
LocalpartCaseSensitive bool `sconf:"optional" sconf-doc:"If set, upper/lower case is relevant for email delivery."`
DKIM DKIM `sconf:"optional" sconf-doc:"With DKIM signing, a domain is taking responsibility for (content of) emails it sends, letting receiving mail servers build up a (hopefully positive) reputation of the domain, which can help with mail delivery."`
DMARC *DMARC `sconf:"optional" sconf-doc:"With DMARC, a domain publishes, in DNS, a policy on how other mail servers should handle incoming messages with the From-header matching this domain and/or subdomain (depending on the configured alignment). Receiving mail servers use this to build up a reputation of this domain, which can help with mail delivery. A domain can also publish an email address to which reports about DMARC verification results can be sent by verifying mail servers, useful for monitoring. Incoming DMARC reports are automatically parsed, validated, added to metrics and stored in the reporting database for later display in the admin web pages."`
MTASTS *MTASTS `sconf:"optional" sconf-doc:"With MTA-STS a domain publishes, in DNS, presence of a policy for using/requiring TLS for SMTP connections. The policy is served over HTTPS."`
MTASTS *MTASTS `sconf:"optional" sconf-doc:"MTA-STS is a mechanism that allows publishing a policy with requirements for WebPKI-verified SMTP STARTTLS connections for email delivered to a domain. Existence of a policy is announced in a DNS TXT record (often unprotected/unverified, MTA-STS's weak spot). If a policy exists, it is fetched with a WebPKI-verified HTTPS request. The policy can indicate that WebPKI-verified SMTP STARTTLS is required, and which MX hosts (optionally with a wildcard pattern) are allowd. MX hosts to deliver to are still taken from DNS (again, not necessarily protected/verified), but messages will only be delivered to domains matching the MX hosts from the published policy. Mail servers look up the MTA-STS policy when first delivering to a domain, then keep a cached copy, periodically checking the DNS record if a new policy is available, and fetching and caching it if so. To update a policy, first serve a new policy with an updated policy ID, then update the DNS record (not the other way around). To remove an enforced policy, publish an updated policy with mode \"none\" for a long enough period so all cached policies have been refreshed (taking DNS TTL and policy max age into account), then remove the policy from DNS, wait for TTL to expire, and stop serving the policy."`
TLSRPT *TLSRPT `sconf:"optional" sconf-doc:"With TLSRPT a domain specifies in DNS where reports about encountered SMTP TLS behaviour should be sent. Useful for monitoring. Incoming TLS reports are automatically parsed, validated, added to metrics and stored in the reporting database for later display in the admin web pages."`
Routes []Route `sconf:"optional" sconf-doc:"Routes for delivering outgoing messages through the queue. Each delivery attempt evaluates account routes, these domain routes and finally global routes. The transport of the first matching route is used in the delivery attempt. If no routes match, which is the default with no configured routes, messages are delivered directly from the queue."`
@ -294,7 +294,7 @@ type Domain struct {
type DMARC struct {
Localpart string `sconf-doc:"Address-part before the @ that accepts DMARC reports. Must be non-internationalized. Recommended value: dmarc-reports."`
Domain string `sconf:"optional" sconf-doc:"Alternative domain for report recipient address. Can be used to receive reports for other domains. Unicode name."`
Domain string `sconf:"optional" sconf-doc:"Alternative domain for reporting address, for incoming reports. Typically empty, causing the domain wherein this config exists to be used. Can be used to receive reports for domains that aren't fully hosted on this server. Configure such a domain as a hosted domain without making all the DNS changes, and configure this field with a domain that is fully hosted on this server, so the localpart and the domain of this field form a reporting address. Then only update the DMARC DNS record for the not fully hosted domain, ensuring the reporting address is specified in its \"rua\" field as shown in the suggested DNS settings. Unicode name."`
Account string `sconf-doc:"Account to deliver to."`
Mailbox string `sconf-doc:"Mailbox to deliver to, e.g. DMARC."`
@ -303,8 +303,8 @@ type DMARC struct {
}
type MTASTS struct {
PolicyID string `sconf-doc:"Policies are versioned. The version must be specified in the DNS record. If you change a policy, first change it in mox, then update the DNS record."`
Mode mtasts.Mode `sconf-doc:"testing, enforce or none. If set to enforce, a remote SMTP server will not deliver email to us if it cannot make a TLS connection."`
PolicyID string `sconf-doc:"Policies are versioned. The version must be specified in the DNS record. If you change a policy, first change it here to update the served policy, then update the DNS record with the updated policy ID."`
Mode mtasts.Mode `sconf-doc:"If set to \"enforce\", a remote SMTP server will not deliver email to us if it cannot make a WebPKI-verified SMTP STARTTLS connection. In mode \"testing\", deliveries can be done without verified TLS, but errors will be reported through TLS reporting. In mode \"none\", verified TLS is not required, used for phasing out an MTA-STS policy."`
MaxAge time.Duration `sconf-doc:"How long a remote mail server is allowed to cache a policy. Typically 1 or several weeks."`
MX []string `sconf:"optional" sconf-doc:"List of server names allowed for SMTP. If empty, the configured hostname is set. Host names can contain a wildcard (*) as a leading label (matching a single label, e.g. *.example matches host.example, not sub.host.example)."`
// todo: parse mx as valid mtasts.Policy.MX, with dns.ParseDomain but taking wildcard into account
@ -312,7 +312,7 @@ type MTASTS struct {
type TLSRPT struct {
Localpart string `sconf-doc:"Address-part before the @ that accepts TLSRPT reports. Recommended value: tls-reports."`
Domain string `sconf:"optional" sconf-doc:"Alternative domain for report recipient address. Can be used to receive reports for other domains. Unicode name."`
Domain string `sconf:"optional" sconf-doc:"Alternative domain for reporting address, for incoming reports. Typically empty, causing the domain wherein this config exists to be used. Can be used to receive reports for domains that aren't fully hosted on this server. Configure such a domain as a hosted domain without making all the DNS changes, and configure this field with a domain that is fully hosted on this server, so the localpart and the domain of this field form a reporting address. Then only update the TLSRPT DNS record for the not fully hosted domain, ensuring the reporting address is specified in its \"rua\" field as shown in the suggested DNS settings. Unicode name."`
Account string `sconf-doc:"Account to deliver to."`
Mailbox string `sconf-doc:"Mailbox to deliver to, e.g. TLSRPT."`
@ -326,7 +326,7 @@ type Canonicalization struct {
}
type Selector struct {
Hash string `sconf:"optional" sconf-doc:"sha256 (default) or (older, not recommended) sha1"`
Hash string `sconf:"optional" sconf-doc:"sha256 (default) or (older, not recommended) sha1."`
HashEffective string `sconf:"-"`
Canonicalization Canonicalization `sconf:"optional"`
Headers []string `sconf:"optional" sconf-doc:"Headers to sign with DKIM. If empty, a reasonable default set of headers is selected."`
@ -335,6 +335,7 @@ type Selector struct {
Expiration string `sconf:"optional" sconf-doc:"Period a signature is valid after signing, as duration, e.g. 72h. The period should be enough for delivery at the final destination, potentially with several hops/relays. In the order of days at least."`
PrivateKeyFile string `sconf-doc:"Either an RSA or ed25519 private key file in PKCS8 PEM form."`
Algorithm string `sconf:"-"` // "ed25519", "rsa-*", based on private key.
ExpirationSeconds int `sconf:"-" json:"-"` // Parsed from Expiration.
Key crypto.Signer `sconf:"-" json:"-"` // As parsed with x509.ParsePKCS8PrivateKey.
Domain dns.Domain `sconf:"-" json:"-"` // Of selector only, not FQDN.