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Patched tor and jtorctl for improved hidden service performance.

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Two changes have been made to Tor:

1. Set can_complete_circuit to false when the network is disabled, and
don't try to build introduction circuits while can_complete_circuit is
false. This avoids a situation where Tor tries to build introduction
circuits as soon as the network is re-enabled, all the circuits fail,
and then Tor waits 5 minutes before trying to build more.

2. Added a FORGETHS command to the control protocol which clears any
cached client state relating to a specified hidden service. This can be
used to flush state that's likely to be stale before trying to connect
to a hidden service with an unstable network connection.

Support for the FORGETHS command was also added to jtorctl.
This commit is contained in:
akwizgran
2014-10-06 18:57:57 +01:00
parent 3051d8811e
commit 9e5e2e2df2
5 changed files with 205 additions and 6 deletions
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briar-android/assets/tor
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briar-android/libs/jtorctl-briar.jar
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6
briar-android/src/org/briarproject/plugins/tor/TorPlugin.java
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@@ -525,6 +525,7 @@ class TorPlugin implements DuplexPlugin, EventHandler {
}
try {
if(LOG.isLoggable(INFO)) LOG.info("Connecting to " + onion);
controlConnection.forgetHiddenService(onion.substring(0, 16));
Socks5Proxy proxy = new Socks5Proxy("127.0.0.1", SOCKS_PORT);
proxy.resolveAddrLocally(false);
Socket s = new SocksSocket(proxy, onion, 80);
@@ -546,7 +547,6 @@ class TorPlugin implements DuplexPlugin, EventHandler {
}
public void circuitStatus(String status, String id, String path) {
if(LOG.isLoggable(INFO)) LOG.info("Circuit " + id + " " + status);
if(status.equals("BUILT") && !circuitBuilt.getAndSet(true)) {
LOG.info("First circuit built");
if(isRunning()) callback.pollNow();
@@ -571,9 +571,7 @@ class TorPlugin implements DuplexPlugin, EventHandler {
}
}
public void unrecognized(String type, String msg) {
if(LOG.isLoggable(INFO)) LOG.info(type + " " + msg);
}
public void unrecognized(String type, String msg) {}
private static class WriteObserver extends FileObserver {

11
jtorctl.patch
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@@ -1,7 +1,7 @@
diff -Bbur jtorctl/net/freehaven/tor/control/TorControlConnection.java jtorctl-briar/net/freehaven/tor/control/TorControlConnection.java
--- jtorctl/net/freehaven/tor/control/TorControlConnection.java 2014-10-03 12:21:51.883098440 +0100
+++ jtorctl-briar/net/freehaven/tor/control/TorControlConnection.java 2014-10-03 12:17:07.429687913 +0100
@@ -728,5 +728,12 @@
+++ jtorctl-briar/net/freehaven/tor/control/TorControlConnection.java 2014-10-06 16:28:53.516851714 +0100
@@ -728,5 +728,19 @@
sendAndWaitForResponse("CLOSECIRCUIT "+circID+
(ifUnused?" IFUNUSED":"")+"\r\n", null);
}
@@ -11,6 +11,13 @@ diff -Bbur jtorctl/net/freehaven/tor/control/TorControlConnection.java jtorctl-b
+ */
+ public void takeOwnership() throws IOException {
+ sendAndWaitForResponse("TAKEOWNERSHIP\r\n", null);
+ }
+
+ /** Tells Tor to forget any cached client state relating to the hidden
+ * service with the given hostname (excluding the .onion extension).
+ */
+ public void forgetHiddenService(String hostname) throws IOException {
+ sendAndWaitForResponse("FORGETHS " + hostname + "\r\n", null);
+ }
}

194
tor.patch Normal file
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@@ -0,0 +1,194 @@
diff --git a/src/or/config.c b/src/or/config.c
index 919dd27..c2d3caf 100644
--- a/src/or/config.c
+++ b/src/or/config.c
@@ -1039,6 +1039,8 @@ options_act_reversible(const or_options_t *old_options, char **msg)
"non-control network connections. Shutting down all existing "
"connections.");
connection_mark_all_noncontrol_connections();
+ /* We can't complete circuits until the network is re-enabled. */
+ can_complete_circuit = 0;
}
}
diff --git a/src/or/control.c b/src/or/control.c
index ae9dd69..0ead4c1 100644
--- a/src/or/control.c
+++ b/src/or/control.c
@@ -36,6 +36,8 @@
#include "nodelist.h"
#include "policies.h"
#include "reasons.h"
+#include "rendclient.h"
+#include "rendcommon.h"
#include "rephist.h"
#include "router.h"
#include "routerlist.h"
@@ -197,6 +199,8 @@ static int handle_control_resolve(control_connection_t *conn, uint32_t len,
static int handle_control_usefeature(control_connection_t *conn,
uint32_t len,
const char *body);
+static int handle_control_forgeths(control_connection_t *conn, uint32_t len,
+ const char *body);
static int write_stream_target_to_buf(entry_connection_t *conn, char *buf,
size_t len);
static void orconn_target_get_name(char *buf, size_t len,
@@ -3181,6 +3185,33 @@ handle_control_usefeature(control_connection_t *conn,
return 0;
}
+/** Called when we get a FORGETHS command: parse the hidden service's onion
+ * address and purge any cached state related to the service. */
+static int
+handle_control_forgeths(control_connection_t *conn, uint32_t len,
+ const char *body)
+{
+ smartlist_t *args;
+ char *onion_address;
+
+ args = getargs_helper("FORGETHS", conn, body, 1, 1);
+ if (!args)
+ return -1;
+ onion_address = smartlist_get(args, 0);
+ smartlist_free(args);
+
+ if (!rend_valid_service_id(onion_address)) {
+ connection_write_str_to_buf("513 Invalid hidden service address\r\n", conn);
+ tor_free(onion_address);
+ return -1;
+ }
+
+ rend_client_purge_hidden_service(onion_address);
+ tor_free(onion_address);
+ send_control_done(conn);
+ return 0;
+}
+
/** Called when <b>conn</b> has no more bytes left on its outbuf. */
int
connection_control_finished_flushing(control_connection_t *conn)
@@ -3480,6 +3511,9 @@ connection_control_process_inbuf(control_connection_t *conn)
} else if (!strcasecmp(conn->incoming_cmd, "AUTHCHALLENGE")) {
if (handle_control_authchallenge(conn, cmd_data_len, args))
return -1;
+ } else if (!strcasecmp(conn->incoming_cmd, "FORGETHS")) {
+ if (handle_control_forgeths(conn, cmd_data_len, args))
+ return -1;
} else {
connection_printf_to_buf(conn, "510 Unrecognized command \"%s\"\r\n",
conn->incoming_cmd);
diff --git a/src/or/rendclient.c b/src/or/rendclient.c
index 7abbfd6..e550b65 100644
--- a/src/or/rendclient.c
+++ b/src/or/rendclient.c
@@ -29,6 +29,8 @@
static extend_info_t *rend_client_get_random_intro_impl(
const rend_cache_entry_t *rend_query,
const int strict, const int warnings);
+static void purge_hid_serv_from_last_hid_serv_requests(
+ const char *onion_address);
/** Purge all potentially remotely-detectable state held in the hidden
* service client code. Called on SIGNAL NEWNYM. */
@@ -40,6 +42,16 @@ rend_client_purge_state(void)
rend_client_purge_last_hid_serv_requests();
}
+/** Purge all cached state relating to the given hidden service. */
+void
+rend_client_purge_hidden_service(const char *onion_address)
+{
+ tor_assert(rend_valid_service_id(onion_address));
+
+ rend_cache_remove_entry(onion_address);
+ purge_hid_serv_from_last_hid_serv_requests(onion_address);
+}
+
/** Called when we've established a circuit to an introduction point:
* send the introduction request. */
void
diff --git a/src/or/rendclient.h b/src/or/rendclient.h
index 1f731d0..7084aef 100644
--- a/src/or/rendclient.h
+++ b/src/or/rendclient.h
@@ -13,6 +13,7 @@
#define TOR_RENDCLIENT_H
void rend_client_purge_state(void);
+void rend_client_purge_hidden_service(const char *onion_address);
void rend_client_introcirc_has_opened(origin_circuit_t *circ);
void rend_client_rendcirc_has_opened(origin_circuit_t *circ);
diff --git a/src/or/rendcommon.c b/src/or/rendcommon.c
index d1b4941..3deb5fc 100644
--- a/src/or/rendcommon.c
+++ b/src/or/rendcommon.c
@@ -954,6 +954,34 @@ rend_cache_lookup_entry(const char *query, int version, rend_cache_entry_t **e)
return 1;
}
+/** Remove any cached descriptors for <b>service_id/b>. */
+void
+rend_cache_remove_entry(const char *service_id)
+{
+ char key[REND_SERVICE_ID_LEN_BASE32+2]; /* <version><service_id>\0 */
+ rend_cache_entry_t *removed;
+
+ tor_assert(rend_valid_service_id(service_id));
+ if (!rend_cache)
+ return;
+
+ tor_snprintf(key, sizeof(key), "2%s", service_id);
+ removed = (rend_cache_entry_t *)strmap_remove_lc(rend_cache, key);
+ if (removed) {
+ log_info(LD_REND, "Removed cached v2 descriptor for service %s.",
+ safe_str_client(service_id));
+ rend_cache_entry_free(removed);
+ }
+
+ tor_snprintf(key, sizeof(key), "0%s", service_id);
+ removed = (rend_cache_entry_t *)strmap_remove_lc(rend_cache, key);
+ if (removed) {
+ log_info(LD_REND, "Removed cached v0 descriptor for service %s.",
+ safe_str_client(service_id));
+ rend_cache_entry_free(removed);
+ }
+}
+
/** <b>query</b> is a base32'ed service id. If it's malformed, return -1.
* Else look it up.
* - If it is found, point *desc to it, and write its length into
diff --git a/src/or/rendcommon.h b/src/or/rendcommon.h
index f476593..331784f 100644
--- a/src/or/rendcommon.h
+++ b/src/or/rendcommon.h
@@ -43,6 +43,7 @@ int rend_cache_lookup_desc(const char *query, int version, const char **desc,
size_t *desc_len);
int rend_cache_lookup_entry(const char *query, int version,
rend_cache_entry_t **entry_out);
+void rend_cache_remove_entry(const char *service_id);
int rend_cache_lookup_v2_desc_as_dir(const char *query, const char **desc);
int rend_cache_store(const char *desc, size_t desc_len, int published,
const char *service_id);
diff --git a/src/or/rendservice.c b/src/or/rendservice.c
index 8a4a11e..35f5e18 100644
--- a/src/or/rendservice.c
+++ b/src/or/rendservice.c
@@ -15,6 +15,7 @@
#include "circuituse.h"
#include "config.h"
#include "directory.h"
+#include "main.h"
#include "networkstatus.h"
#include "nodelist.h"
#include "rendclient.h"
@@ -3024,6 +3025,9 @@ rend_services_introduce(void)
time_t now;
const or_options_t *options = get_options();
+ if (!can_complete_circuit)
+ return;
+
intro_nodes = smartlist_new();
now = time(NULL);