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util.sasl.oauthbearer: Return username from callback instead using authzid (BC)

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RFC 6120 states that
>  If the initiating entity does not wish to act on behalf of another
>  entity, it MUST NOT provide an authorization identity.

Thus it seems weird to require it here.  We can instead expect an
username from the token data passed back from the profile.

This follows the practice of util.sasl.external where the profile
callback returns the selected username, making the authentication module
responsible for extracting the username from the token.
This commit is contained in:
Kim Alvefur 2023-03-16 12:18:23 +01:00
parent 944c25f352
commit 566a991f84
2 changed files with 10 additions and 38 deletions
Download patch file Download diff file Expand all files Collapse all files

12
plugins/mod_tokenauth.lua
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@ -125,19 +125,21 @@ function revoke_token(token)
end
function sasl_handler(auth_provider, purpose, extra)
return function (_, username, token, realm)
return function (sasl, token, realm, _authzid)
local token_info, err = get_token_info(token);
if not token_info then
module:log("debug", "SASL handler failed to verify token: %s", err);
return nil, nil, extra;
end
local token_user, token_host = jid.split(token_info.jid);
if username ~= token_user or realm ~= token_host or (purpose and token_info.purpose ~= purpose) then
local token_user, token_host, resource = jid.split(token_info.jid);
if realm ~= token_host or (purpose and token_info.purpose ~= purpose) then
return nil, nil, extra;
end
if auth_provider.is_enabled and not auth_provider.is_enabled(username) then
if auth_provider.is_enabled and not auth_provider.is_enabled(token_user) then
return true, false, token_info;
end
return true, true, token_info;
sasl.resource = resource;
sasl.token_info = token_info;
return token_user, true, token_info;
end;
end