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-rw-r--r--xmpp-vala/src/module/xep/0065_socks5_bytestreams.vala17
-rw-r--r--xmpp-vala/src/module/xep/0260_jingle_socks5_bytestreams.vala217
2 files changed, 221 insertions, 13 deletions
diff --git a/xmpp-vala/src/module/xep/0065_socks5_bytestreams.vala b/xmpp-vala/src/module/xep/0065_socks5_bytestreams.vala
index fdee2411..c184877c 100644
--- a/xmpp-vala/src/module/xep/0065_socks5_bytestreams.vala
+++ b/xmpp-vala/src/module/xep/0065_socks5_bytestreams.vala
@@ -18,21 +18,34 @@ public class Proxy : Object {
}
}
+public delegate Gee.List<string> GetLocalIpAddresses();
+
public class Module : XmppStreamModule, Iq.Handler {
public static Xmpp.ModuleIdentity<Module> IDENTITY = new Xmpp.ModuleIdentity<Module>(NS_URI, "0065_socks5_bytestreams");
+ private GetLocalIpAddresses? get_local_ip_addresses_impl = null;
+
public override void attach(XmppStream stream) {
stream.add_flag(new Flag());
query_availability.begin(stream);
}
public override void detach(XmppStream stream) { }
- public async void on_iq_set(XmppStream stream, Iq.Stanza iq) { }
-
public Gee.List<Proxy> get_proxies(XmppStream stream) {
return stream.get_flag(Flag.IDENTITY).proxies;
}
+ public void set_local_ip_address_handler(owned GetLocalIpAddresses get_local_ip_addresses) {
+ get_local_ip_addresses_impl = (owned)get_local_ip_addresses;
+ }
+
+ public Gee.List<string> get_local_ip_addresses() {
+ if (get_local_ip_addresses_impl == null) {
+ return Gee.List.empty();
+ }
+ return get_local_ip_addresses_impl();
+ }
+
private async void query_availability(XmppStream stream) {
ServiceDiscovery.ItemsResult? items_result = yield stream.get_module(ServiceDiscovery.Module.IDENTITY).request_items(stream, stream.remote_name);
if (items_result == null) return;
diff --git a/xmpp-vala/src/module/xep/0260_jingle_socks5_bytestreams.vala b/xmpp-vala/src/module/xep/0260_jingle_socks5_bytestreams.vala
index ea7ef375..bb31cadc 100644
--- a/xmpp-vala/src/module/xep/0260_jingle_socks5_bytestreams.vala
+++ b/xmpp-vala/src/module/xep/0260_jingle_socks5_bytestreams.vala
@@ -5,6 +5,7 @@ using Xmpp.Xep;
namespace Xmpp.Xep.JingleSocks5Bytestreams {
private const string NS_URI = "urn:xmpp:jingle:transports:s5b:1";
+private const int NEGOTIATION_TIMEOUT = 3;
public class Module : Jingle.Transport, XmppStreamModule {
public static Xmpp.ModuleIdentity<Module> IDENTITY = new Xmpp.ModuleIdentity<Module>(NS_URI, "0260_jingle_socks5_bytestreams");
@@ -33,7 +34,7 @@ public class Module : Jingle.Transport, XmppStreamModule {
public int transport_priority() {
return 1;
}
- private Gee.List<Candidate> get_local_candidates(XmppStream stream) {
+ private Gee.List<Candidate> get_proxies(XmppStream stream) {
Gee.List<Candidate> result = new ArrayList<Candidate>();
int i = 1 << 15;
foreach (Socks5Bytestreams.Proxy proxy in stream.get_module(Socks5Bytestreams.Module.IDENTITY).get_proxies(stream)) {
@@ -42,18 +43,59 @@ public class Module : Jingle.Transport, XmppStreamModule {
}
return result;
}
+ private Gee.List<Candidate> start_local_listeners(XmppStream stream, Jid local_full_jid, string dstaddr, out LocalListener? local_listener) {
+ Gee.List<Candidate> result = new ArrayList<Candidate>();
+ SocketListener listener = new SocketListener();
+ int i = 1 << 15;
+ foreach (string ip_address in stream.get_module(Socks5Bytestreams.Module.IDENTITY).get_local_ip_addresses()) {
+ InetSocketAddress addr = new InetSocketAddress.from_string(ip_address, 0);
+ SocketAddress effective_any;
+ string cid = random_uuid();
+ try {
+ listener.add_address(addr, SocketType.STREAM, SocketProtocol.DEFAULT, new StringWrapper(cid), out effective_any);
+ } catch (Error e) {
+ continue;
+ }
+ InetSocketAddress effective = (InetSocketAddress)effective_any;
+ result.add(new Candidate.build(cid, ip_address, local_full_jid, (int)effective.port, i, CandidateType.DIRECT));
+ i -= 1;
+ }
+ if (!result.is_empty) {
+ local_listener = new LocalListener(listener, dstaddr);
+ local_listener.start();
+ } else {
+ local_listener = new LocalListener.empty();
+ }
+ return result;
+ }
+ private void select_candidates(XmppStream stream, Jid local_full_jid, string dstaddr, Parameters result) {
+ result.local_candidates.add_all(get_proxies(stream));
+ result.local_candidates.add_all(start_local_listeners(stream, local_full_jid, dstaddr, out result.listener));
+ result.local_candidates.sort((c1, c2) => {
+ if (c1.priority < c2.priority) { return 1; }
+ if (c1.priority > c2.priority) { return -1; }
+ return 0;
+ });
+ }
public Jingle.TransportParameters create_transport_parameters(XmppStream stream, Jid local_full_jid, Jid peer_full_jid) {
Parameters result = new Parameters.create(local_full_jid, peer_full_jid, random_uuid());
- result.local_candidates.add_all(get_local_candidates(stream));
+ string dstaddr = calculate_dstaddr(result.sid, local_full_jid, peer_full_jid);
+ select_candidates(stream, local_full_jid, dstaddr, result);
return result;
}
public Jingle.TransportParameters parse_transport_parameters(XmppStream stream, Jid local_full_jid, Jid peer_full_jid, StanzaNode transport) throws Jingle.IqError {
Parameters result = Parameters.parse(local_full_jid, peer_full_jid, transport);
- result.local_candidates.add_all(get_local_candidates(stream));
+ string dstaddr = calculate_dstaddr(result.sid, local_full_jid, peer_full_jid);
+ select_candidates(stream, local_full_jid, dstaddr, result);
return result;
}
}
+private string calculate_dstaddr(string sid, Jid first_jid, Jid second_jid) {
+ string hashed = sid + first_jid.to_string() + second_jid.to_string();
+ return Checksum.compute_for_string(ChecksumType.SHA1, hashed);
+}
+
public enum CandidateType {
ASSISTED,
DIRECT,
@@ -156,6 +198,142 @@ bool bytes_equal(uint8[] a, uint8[] b) {
return true;
}
+class StringWrapper : GLib.Object {
+ public string str { get; set; }
+
+ public StringWrapper(string str) {
+ this.str = str;
+ }
+}
+
+class LocalListener {
+ SocketListener? inner;
+ string dstaddr;
+ HashMap<string, SocketConnection> connections = new HashMap<string, SocketConnection>();
+
+ public LocalListener(SocketListener inner, string dstaddr) {
+ this.inner = inner;
+ this.dstaddr = dstaddr;
+ }
+ public LocalListener.empty() {
+ this.inner = null;
+ this.dstaddr = "";
+ }
+
+ public void start() {
+ if (inner == null) {
+ return;
+ }
+ run.begin();
+ }
+ async void run() {
+ while (true) {
+ Object cid;
+ SocketConnection conn;
+ try {
+ conn = yield inner.accept_async(null, out cid);
+ } catch (Error e) {
+ break;
+ }
+ handle_conn.begin(((StringWrapper)cid).str, conn);
+ }
+ }
+ async void handle_conn(string cid, SocketConnection conn) {
+ conn.socket.timeout = NEGOTIATION_TIMEOUT;
+ size_t read;
+ size_t written;
+ uint8[] read_buffer = new uint8[1024];
+ ByteArray write_buffer = new ByteArray();
+
+ try {
+ // 05 SOCKS version 5
+ // ?? number of authentication methods
+ yield conn.input_stream.read_all_async(read_buffer[0:2], GLib.Priority.DEFAULT, null, out read);
+ if (read != 2) {
+ throw new IOError.PROXY_FAILED("wanted client hello message consisting of 2 bytes, only got %d bytes".printf((int)read));
+ }
+ if (read_buffer[0] != 0x05 || read_buffer[1] == 0) {
+ throw new IOError.PROXY_FAILED("wanted 05 xx, got %02x %02x".printf(read_buffer[0], read_buffer[1]));
+ }
+ int num_auth_methods = read_buffer[1];
+ // ?? authentication method (num_auth_methods times)
+ yield conn.input_stream.read_all_async(read_buffer[0:num_auth_methods], GLib.Priority.DEFAULT, null, out read);
+ bool found_null_auth = false;
+ for (int i = 0; i < read; i++) {
+ if (read_buffer[i] == 0x00) {
+ found_null_auth = true;
+ break;
+ }
+ }
+ if (read != num_auth_methods || !found_null_auth) {
+ throw new IOError.PROXY_FAILED("peer didn't offer null auth");
+ }
+ // 05 SOCKS version 5
+ // 00 nop authentication
+ yield conn.output_stream.write_all_async({0x05, 0x00}, GLib.Priority.DEFAULT, null, out written);
+
+ // 05 SOCKS version 5
+ // 01 connect
+ // 00 reserved
+ // 03 address type: domain name
+ // ?? length of the domain
+ // .. domain
+ // 00 port 0 (upper half)
+ // 00 port 0 (lower half)
+ yield conn.input_stream.read_all_async(read_buffer[0:4], GLib.Priority.DEFAULT, null, out read);
+ if (read != 4) {
+ throw new IOError.PROXY_FAILED("wanted connect message consisting of 4 bytes, only got %d bytes".printf((int)read));
+ }
+ if (read_buffer[0] != 0x05 || read_buffer[1] != 0x01 || read_buffer[3] != 0x03) {
+ throw new IOError.PROXY_FAILED("wanted 05 00 ?? 03, got %02x %02x %02x %02x".printf(read_buffer[0], read_buffer[1], read_buffer[2], read_buffer[3]));
+ }
+ yield conn.input_stream.read_all_async(read_buffer[0:1], GLib.Priority.DEFAULT, null, out read);
+ if (read != 1) {
+ throw new IOError.PROXY_FAILED("wanted length of dstaddr consisting of 1 byte, only got %d bytes".printf((int)read));
+ }
+ int dstaddr_len = read_buffer[0];
+ yield conn.input_stream.read_all_async(read_buffer[0:dstaddr_len+2], GLib.Priority.DEFAULT, null, out read);
+ if (read != dstaddr_len + 2) {
+ throw new IOError.PROXY_FAILED("wanted dstaddr and port consisting of %d bytes, got %d bytes".printf(dstaddr_len + 2, (int)read));
+ }
+ if (!bytes_equal(read_buffer[0:dstaddr_len], dstaddr.data)) {
+ string repr = ((string)read_buffer[0:dstaddr.length]).make_valid().escape();
+ throw new IOError.PROXY_FAILED(@"wanted dstaddr $(dstaddr), got $(repr)");
+ }
+ if (read_buffer[dstaddr_len] != 0x00 || read_buffer[dstaddr_len + 1] != 0x00) {
+ throw new IOError.PROXY_FAILED("wanted 00 00, got %02x %02x".printf(read_buffer[dstaddr_len], read_buffer[dstaddr_len + 1]));
+ }
+
+ // 05 SOCKS version 5
+ // 00 success
+ // 00 reserved
+ // 03 address type: domain name
+ // ?? length of the domain
+ // .. domain
+ // 00 port 0 (upper half)
+ // 00 port 0 (lower half)
+ write_buffer.append({0x05, 0x00, 0x00, 0x03});
+ write_buffer.append({(uint8)dstaddr.length});
+ write_buffer.append(dstaddr.data);
+ write_buffer.append({0x00, 0x00});
+ yield conn.output_stream.write_all_async(write_buffer.data, GLib.Priority.DEFAULT, null, out written);
+
+ conn.socket.timeout = 0;
+ if (!connections.has_key(cid)) {
+ connections[cid] = conn;
+ }
+ } catch (Error e) {
+ }
+ }
+
+ public SocketConnection? get_connection(string cid) {
+ if (!connections.has_key(cid)) {
+ return null;
+ }
+ return connections[cid];
+ }
+}
+
class Parameters : Jingle.TransportParameters, Object {
public Jingle.Role role { get; private set; }
public string sid { get; private set; }
@@ -163,6 +341,7 @@ class Parameters : Jingle.TransportParameters, Object {
public string local_dstaddr { get; private set; }
public Gee.List<Candidate> local_candidates = new ArrayList<Candidate>();
public Gee.List<Candidate> remote_candidates = new ArrayList<Candidate>();
+ public LocalListener? listener = null;
Jid local_full_jid;
Jid peer_full_jid;
@@ -179,10 +358,6 @@ class Parameters : Jingle.TransportParameters, Object {
SourceFunc waiting_for_activation_callback;
bool waiting_for_activation_error = false;
- private static string calculate_dstaddr(string sid, Jid first_jid, Jid second_jid) {
- string hashed = sid + first_jid.to_string() + second_jid.to_string();
- return Checksum.compute_for_string(ChecksumType.SHA1, hashed);
- }
private Parameters(Jingle.Role role, string sid, Jid local_full_jid, Jid peer_full_jid, string? remote_dstaddr) {
this.role = role;
this.sid = sid;
@@ -355,7 +530,21 @@ class Parameters : Jingle.TransportParameters, Object {
wait_for_remote_activation.begin(local_selected_candidate, local_selected_candidate_conn);
}
} else {
- connect_to_local_candidate.begin(remote_selected_candidate);
+ if (remote_selected_candidate.type_ == CandidateType.DIRECT) {
+ Jingle.Session? strong = session;
+ if (strong == null) {
+ return;
+ }
+ SocketConnection? conn = listener.get_connection(remote_selected_candidate.cid);
+ if (conn == null) {
+ // Remote hasn't actually connected to us?!
+ strong.set_transport_connection(hack, null);
+ return;
+ }
+ strong.set_transport_connection(hack, conn);
+ } else {
+ connect_to_local_candidate.begin(remote_selected_candidate);
+ }
}
}
public async void wait_for_remote_activation(Candidate candidate, SocketConnection conn) {
@@ -425,7 +614,7 @@ class Parameters : Jingle.TransportParameters, Object {
}
}
public async SocketConnection connect_to_socks5(Candidate candidate, string dstaddr) throws Error {
- SocketClient socket_client = new SocketClient() { timeout=3 };
+ SocketClient socket_client = new SocketClient() { timeout=NEGOTIATION_TIMEOUT };
string address = @"[$(candidate.host)]:$(candidate.port)";
debug("Connecting to SOCKS5 server at %s", address);
@@ -444,7 +633,10 @@ class Parameters : Jingle.TransportParameters, Object {
yield conn.input_stream.read_all_async(read_buffer[0:2], GLib.Priority.DEFAULT, null, out read);
// 05 SOCKS version 5
- // 01 success
+ // 00 nop authentication
+ if (read != 2) {
+ throw new IOError.PROXY_FAILED("wanted 05 00, only got %d bytes".printf((int)read));
+ }
if (read_buffer[0] != 0x05 || read_buffer[1] != 0x00) {
throw new IOError.PROXY_FAILED("wanted 05 00, got %02x %02x".printf(read_buffer[0], read_buffer[1]));
}
@@ -472,6 +664,9 @@ class Parameters : Jingle.TransportParameters, Object {
// .. domain
// 00 port 0 (upper half)
// 00 port 0 (lower half)
+ if (read != write_buffer.len) {
+ throw new IOError.PROXY_FAILED("wanted server success response consisting of %d bytes, only got %d bytes".printf((int)write_buffer.len, (int)read));
+ }
if (read_buffer[0] != 0x05 || read_buffer[1] != 0x00 || read_buffer[3] != 0x03) {
throw new IOError.PROXY_FAILED("wanted 05 00 ?? 03, got %02x %02x %02x %02x".printf(read_buffer[0], read_buffer[1], read_buffer[2], read_buffer[3]));
}
@@ -486,7 +681,7 @@ class Parameters : Jingle.TransportParameters, Object {
throw new IOError.PROXY_FAILED("wanted port 00 00, got %02x %02x".printf(read_buffer[5+dstaddr.length], read_buffer[5+dstaddr.length+1]));
}
- conn.get_socket().set_timeout(0);
+ conn.socket.timeout = 0;
return conn;
}
generated by cgit v1.2.3-70-g09d2 (git 2.47.0) at 2024-11-16 01:08:10 +0000