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sasl: wrap the s2s sasl relay in encap (client/agent/mode/data) so services drive authenticate, account via metadata

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This commit is contained in:
Jean Chevronnet 2026-08-15 12:04:09 +00:00
parent 1c8799d785
commit 62f901bdc8
2 changed files with 41 additions and 20 deletions
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43
src/link.rs
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@ -758,8 +758,11 @@ impl Server {
.map(|sv| sv.via)
}
/// Relay one SASL step for local client `uid` to the services server:
/// `:<our-sid> SASL <client-uuid> <rest>`. No-op if SASL services aren't linked.
/// Relay one SASL step for local client `uid` to the services server, wrapped
/// as `:<our-sid> ENCAP <svc> SASL <client-uuid> * <mode> [data...]`. `rest` is
/// the mode letter and its data (e.g. `S PLAIN`, `C <b64>`). The agent field is
/// `*` — services accept it, so we needn't track their agent id. No-op with no
/// SASL services linked.
pub fn sasl_relay(&self, uid: Uid, rest: &str) {
let (Some(via), Some(uuid)) = (
self.sasl_link(),
@ -767,33 +770,43 @@ impl Server {
) else {
return;
};
self.link_out(via, format!(":{} SASL {uuid} {rest}", self.sid));
let mask = self
.servers
.values()
.find(|s| s.via == via)
.map(|s| s.sid.clone())
.unwrap_or_else(|| "*".to_string());
self.link_out(via, format!(":{} ENCAP {mask} SASL {uuid} * {rest}", self.sid));
}
/// A SASL message from services: `:<svcsid> SASL <client-uuid> <type> …`.
/// A SASL step from services, unwrapped from its ENCAP: params are
/// `<agent> <client-uuid> <mode> [data...]`.
/// `C <data>` → relay a server challenge to the client as `AUTHENTICATE`;
/// `D S [account]` → success (log in + 900/903); `D <other>` → fail (904).
/// `D S` → success (the account was set by a preceding `METADATA accountname`,
/// so we emit 900/903 for it); `D <other>` → fail (904).
fn link_sasl(&mut self, from: Uid, msg: &Message) {
if msg.params.len() < 2 {
if msg.params.len() < 3 {
return;
}
let Some(&uid) = self.uuid_local.get(&msg.params[0]) else {
let client = msg.params[1].clone();
let Some(&uid) = self.uuid_local.get(&client) else {
// not our client — route toward the server that owns them
self.forward_to_target(&msg.params[0], msg, from);
self.forward_to_target(&client, msg, from);
return;
};
match msg.params[1].as_str() {
match msg.params[2].as_str() {
"C" => {
if let Some(data) = msg.params.get(2) {
if let Some(data) = msg.params.get(3) {
self.send(uid, format!("AUTHENTICATE {data}"));
}
}
"D" => {
let ok = msg.params.get(2).map(|t| t == "S").unwrap_or(false);
let account = msg.params.get(3).cloned().unwrap_or_default();
if ok && !account.is_empty() {
self.set_login(uid, &account);
}
let ok = msg.params.get(3).map(|t| t == "S").unwrap_or(false);
let account = self
.users
.get(&uid)
.and_then(|u| u.account.clone())
.unwrap_or_default();
self.sasl_done(uid, ok, &account);
if let Some(u) = self.users.get_mut(&uid) {
u.sasl_mech = None;