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code /
prosody
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plugins/mod_tls.lua @ 12601:72f7bb3f30d3
net.resolvers.basic: Add opt-out argument for DNSSEC security status
This makes explicit which lookups can accept an unsigned response.
Insecure (unsigned, as before DNSSEC) A and AAAA records can be used as
security would come from TLS, but an insecure TLSA record is worthless.
author | Kim Alvefur <zash@zash.se> |
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date | Tue, 02 Aug 2022 16:08:43 +0200 |
parent | 12484:fb65b5a033b2 |
child | 12602:9184fe3d489a |
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-- Prosody IM -- Copyright (C) 2008-2010 Matthew Wild -- Copyright (C) 2008-2010 Waqas Hussain -- -- This project is MIT/X11 licensed. Please see the -- COPYING file in the source package for more information. -- local create_context = require "core.certmanager".create_context; local rawgetopt = require"core.configmanager".rawget; local st = require "util.stanza"; local c2s_require_encryption = module:get_option("c2s_require_encryption", module:get_option("require_encryption", true)); local s2s_require_encryption = module:get_option("s2s_require_encryption", true); local allow_s2s_tls = module:get_option("s2s_allow_encryption") ~= false; local s2s_secure_auth = module:get_option("s2s_secure_auth"); if s2s_secure_auth and s2s_require_encryption == false then module:log("warn", "s2s_secure_auth implies s2s_require_encryption, but s2s_require_encryption is set to false"); s2s_require_encryption = true; end local xmlns_starttls = 'urn:ietf:params:xml:ns:xmpp-tls'; local starttls_attr = { xmlns = xmlns_starttls }; local starttls_initiate= st.stanza("starttls", starttls_attr); local starttls_proceed = st.stanza("proceed", starttls_attr); local starttls_failure = st.stanza("failure", starttls_attr); local c2s_feature = st.stanza("starttls", starttls_attr); local s2s_feature = st.stanza("starttls", starttls_attr); if c2s_require_encryption then c2s_feature:tag("required"):up(); end if s2s_require_encryption then s2s_feature:tag("required"):up(); end local hosts = prosody.hosts; local host = hosts[module.host]; local ssl_ctx_c2s, ssl_ctx_s2sout, ssl_ctx_s2sin; local ssl_cfg_c2s, ssl_cfg_s2sout, ssl_cfg_s2sin; local err_c2s, err_s2sin, err_s2sout; function module.load(reload) local NULL = {}; local modhost = module.host; local parent = modhost:match("%.(.*)$"); local parent_ssl = rawgetopt(parent, "ssl") or NULL; local host_ssl = rawgetopt(modhost, "ssl") or parent_ssl; local global_c2s = rawgetopt("*", "c2s_ssl") or NULL; local parent_c2s = rawgetopt(parent, "c2s_ssl") or NULL; local host_c2s = rawgetopt(modhost, "c2s_ssl") or parent_c2s; local global_s2s = rawgetopt("*", "s2s_ssl") or NULL; local parent_s2s = rawgetopt(parent, "s2s_ssl") or NULL; local host_s2s = rawgetopt(modhost, "s2s_ssl") or parent_s2s; module:log("debug", "Creating context for c2s"); local request_client_certs = { verify = { "peer", "client_once", }; }; local xmpp_alpn = { alpn = "xmpp-server" }; ssl_ctx_c2s, err_c2s, ssl_cfg_c2s = create_context(host.host, "server", host_c2s, host_ssl, global_c2s); -- for incoming client connections if not ssl_ctx_c2s then module:log("error", "Error creating context for c2s: %s", err_c2s); end module:log("debug", "Creating context for s2sout"); -- for outgoing server connections ssl_ctx_s2sout, err_s2sout, ssl_cfg_s2sout = create_context(host.host, "client", host_s2s, host_ssl, global_s2s, request_client_certs, xmpp_alpn); if not ssl_ctx_s2sout then module:log("error", "Error creating contexts for s2sout: %s", err_s2sout); end module:log("debug", "Creating context for s2sin"); -- for incoming server connections ssl_ctx_s2sin, err_s2sin, ssl_cfg_s2sin = create_context(host.host, "server", host_s2s, host_ssl, global_s2s, request_client_certs); if not ssl_ctx_s2sin then module:log("error", "Error creating contexts for s2sin: %s", err_s2sin); end if reload then module:log("info", "Certificates reloaded"); else module:log("info", "Certificates loaded"); end end module:hook_global("config-reloaded", module.load); local function can_do_tls(session) if session.secure then return false; end if session.conn and not session.conn.starttls then if not session.secure then session.log("debug", "Underlying connection does not support STARTTLS"); end return false; elseif session.ssl_ctx ~= nil then return session.ssl_ctx; end if session.type == "c2s_unauthed" then if not ssl_ctx_c2s and c2s_require_encryption then session.log("error", "No TLS context available for c2s. Earlier error was: %s", err_c2s); end session.ssl_ctx = ssl_ctx_c2s; session.ssl_cfg = ssl_cfg_c2s; elseif session.type == "s2sin_unauthed" and allow_s2s_tls then if not ssl_ctx_s2sin and s2s_require_encryption then session.log("error", "No TLS context available for s2sin. Earlier error was: %s", err_s2sin); end session.ssl_ctx = ssl_ctx_s2sin; session.ssl_cfg = ssl_cfg_s2sin; elseif session.direction == "outgoing" and allow_s2s_tls then if not ssl_ctx_s2sout and s2s_require_encryption then session.log("error", "No TLS context available for s2sout. Earlier error was: %s", err_s2sout); end session.ssl_ctx = ssl_ctx_s2sout; session.ssl_cfg = ssl_cfg_s2sout; else session.log("debug", "Unknown session type, don't know which TLS context to use"); return false; end if not session.ssl_ctx then session.log("debug", "Should be able to do TLS but no context available"); return false; end return session.ssl_ctx; end module:hook("s2sout-created", function (event) -- Initialize TLS context for outgoing connections can_do_tls(event.session); end); -- Hook <starttls/> module:hook("stanza/urn:ietf:params:xml:ns:xmpp-tls:starttls", function(event) local origin = event.origin; if can_do_tls(origin) then if origin.conn.block_reads then -- we need to ensure that no data is read anymore, otherwise we could end up in a situation where -- <proceed/> is sent and the socket receives the TLS handshake (and passes the data to lua) before -- it is asked to initiate TLS -- (not with the classical single-threaded server backends) origin.conn:block_reads() end (origin.sends2s or origin.send)(starttls_proceed); if origin.destroyed then return end origin:reset_stream(); origin.conn:starttls(origin.ssl_ctx); origin.log("debug", "TLS negotiation started for %s...", origin.type); origin.secure = false; else origin.log("warn", "Attempt to start TLS, but TLS is not available on this %s connection", origin.type); (origin.sends2s or origin.send)(starttls_failure); origin:close(); end return true; end); -- Advertise stream feature module:hook("stream-features", function(event) local origin, features = event.origin, event.features; if can_do_tls(origin) then features:add_child(c2s_feature); end end); module:hook("s2s-stream-features", function(event) local origin, features = event.origin, event.features; if can_do_tls(origin) then features:add_child(s2s_feature); end end); -- For s2sout connections, start TLS if we can module:hook_tag("http://etherx.jabber.org/streams", "features", function (session, stanza) module:log("debug", "Received features element"); if can_do_tls(session) then if stanza:get_child("starttls", xmlns_starttls) then module:log("debug", "%s is offering TLS, taking up the offer...", session.to_host); elseif s2s_require_encryption then module:log("debug", "%s is *not* offering TLS, trying anyways!", session.to_host); else module:log("debug", "%s is not offering TLS", session.to_host); return; end session.sends2s(starttls_initiate); return true; end end, 500); module:hook("s2sout-authenticate-legacy", function(event) local session = event.origin; if s2s_require_encryption and can_do_tls(session) then session.sends2s(starttls_initiate); return true; end end, 200); module:hook_tag(xmlns_starttls, "proceed", function (session, stanza) -- luacheck: ignore 212/stanza if session.type == "s2sout_unauthed" and can_do_tls(session) then module:log("debug", "Proceeding with TLS on s2sout..."); session:reset_stream(); session.conn:starttls(session.ssl_ctx, session.to_host); session.secure = false; return true; end end); module:hook_tag(xmlns_starttls, "failure", function (session, stanza) -- luacheck: ignore 212/stanza module:log("warn", "TLS negotiation with %s failed.", session.to_host); session:close(nil, "TLS negotiation failed"); return false; end);