[tor-commits] [tor/master] Config option to specify specific MiddleNodes.
nickm at torproject.org
nickm at torproject.org
Mon Jan 14 19:50:35 UTC 2019
commit 8ad497bb578b13c66489843905764a60545e6388
Author: Mike Perry <mikeperry-git at torproject.org>
Date: Tue Oct 23 21:02:31 2018 +0000
Config option to specify specific MiddleNodes.
Hope is this will make it easier to test on the live tor network.
Does not need to be merged if we don't want to, but will come in handy
for researchers.
Co-authored-by: George Kadianakis <desnacked at riseup.net>
---
doc/tor.1.txt | 30 +++++++++++++++++++++++-------
src/app/config/config.c | 6 ++++++
src/app/config/or_options_st.h | 3 +++
src/core/or/circuitbuild.c | 19 ++++++++++++++++++-
src/feature/nodelist/nodelist.c | 2 +-
src/feature/nodelist/routerlist.c | 2 ++
6 files changed, 53 insertions(+), 9 deletions(-)
diff --git a/doc/tor.1.txt b/doc/tor.1.txt
index 4ff789a93..455356163 100644
--- a/doc/tor.1.txt
+++ b/doc/tor.1.txt
@@ -1020,6 +1020,21 @@ The following options are useful only for clients (that is, if
The .exit address notation, if enabled via MapAddress, overrides
this option.
+[[MiddleNodes]] **MiddleNodes** __node__,__node__,__...__::
+ A list of identity fingerprints and country codes of nodes
+ to use for "middle" hops in your normal circuits.
+ Normal circuits include all circuits except for direct connections
+ to directory servers. Middle hops are all hops other than exit and entry. +
++
+ The HSLayer2Node and HSLayer3Node options override this option for onion
+ service circuits, if they are set. The vanguards addon will read this
+ option, and if set, it will set HSLayer2Nodes and HSLayer3Nodes to nodes
+ from this set.
++
+ The ExcludeNodes option overrides this option: any node listed in both
+ MiddleNodes and ExcludeNodes is treated as excluded. See
+ the **ExcludeNodes** option for more information on how to specify nodes.
+
[[EntryNodes]] **EntryNodes** __node__,__node__,__...__::
A list of identity fingerprints and country codes of nodes
to use for the first hop in your normal circuits.
@@ -1036,13 +1051,14 @@ The following options are useful only for clients (that is, if
If StrictNodes is set to 1, Tor will treat solely the ExcludeNodes option
as a requirement to follow for all the circuits you generate, even if
doing so will break functionality for you (StrictNodes applies to neither
- ExcludeExitNodes nor to ExitNodes). If StrictNodes is set to 0, Tor will
- still try to avoid nodes in the ExcludeNodes list, but it will err on the
- side of avoiding unexpected errors. Specifically, StrictNodes 0 tells Tor
- that it is okay to use an excluded node when it is *necessary* to perform
- relay reachability self-tests, connect to a hidden service, provide a
- hidden service to a client, fulfill a .exit request, upload directory
- information, or download directory information. (Default: 0)
+ ExcludeExitNodes nor to ExitNodes, nor to MiddleNodes). If StrictNodes
+ is set to 0, Tor will still try to avoid nodes in the ExcludeNodes list,
+ but it will err on the side of avoiding unexpected errors.
+ Specifically, StrictNodes 0 tells Tor that it is okay to use an excluded
+ node when it is *necessary* to perform relay reachability self-tests,
+ connect to a hidden service, provide a hidden service to a client,
+ fulfill a .exit request, upload directory information, or download
+ directory information. (Default: 0)
[[FascistFirewall]] **FascistFirewall** **0**|**1**::
If 1, Tor will only create outgoing connections to ORs running on ports
diff --git a/src/app/config/config.c b/src/app/config/config.c
index 32b487dd2..728b7ff65 100644
--- a/src/app/config/config.c
+++ b/src/app/config/config.c
@@ -418,6 +418,10 @@ static config_var_t option_vars_[] = {
V(ExcludeExitNodes, ROUTERSET, NULL),
OBSOLETE("ExcludeSingleHopRelays"),
V(ExitNodes, ROUTERSET, NULL),
+ /* Researchers need a way to tell their clients to use specific
+ * middles that they also control, to allow safe live-network
+ * experimentation with new padding machines. */
+ V(MiddleNodes, ROUTERSET, NULL),
V(ExitPolicy, LINELIST, NULL),
V(ExitPolicyRejectPrivate, BOOL, "1"),
V(ExitPolicyRejectLocalInterfaces, BOOL, "0"),
@@ -1690,6 +1694,7 @@ options_need_geoip_info(const or_options_t *options, const char **reason_out)
int routerset_usage =
routerset_needs_geoip(options->EntryNodes) ||
routerset_needs_geoip(options->ExitNodes) ||
+ routerset_needs_geoip(options->MiddleNodes) ||
routerset_needs_geoip(options->ExcludeExitNodes) ||
routerset_needs_geoip(options->ExcludeNodes) ||
routerset_needs_geoip(options->HSLayer2Nodes) ||
@@ -2129,6 +2134,7 @@ options_act(const or_options_t *old_options)
options->HSLayer2Nodes) ||
!routerset_equal(old_options->HSLayer3Nodes,
options->HSLayer3Nodes) ||
+ !routerset_equal(old_options->MiddleNodes, options->MiddleNodes) ||
options->StrictNodes != old_options->StrictNodes) {
log_info(LD_CIRC,
"Changed to using entry guards or bridges, or changed "
diff --git a/src/app/config/or_options_st.h b/src/app/config/or_options_st.h
index c2bc1079a..63a17c977 100644
--- a/src/app/config/or_options_st.h
+++ b/src/app/config/or_options_st.h
@@ -72,6 +72,9 @@ struct or_options_t {
routerset_t *ExitNodes; /**< Structure containing nicknames, digests,
* country codes and IP address patterns of ORs to
* consider as exits. */
+ routerset_t *MiddleNodes; /**< Structure containing nicknames, digests,
+ * country codes and IP address patterns of ORs to
+ * consider as middles. */
routerset_t *EntryNodes;/**< Structure containing nicknames, digests,
* country codes and IP address patterns of ORs to
* consider as entry points. */
diff --git a/src/core/or/circuitbuild.c b/src/core/or/circuitbuild.c
index 2d8bc4d4a..22e4cf96d 100644
--- a/src/core/or/circuitbuild.c
+++ b/src/core/or/circuitbuild.c
@@ -2610,7 +2610,24 @@ choose_good_middle_server(uint8_t purpose,
return choice;
}
- choice = router_choose_random_node(excluded, options->ExcludeNodes, flags);
+ if (options->MiddleNodes) {
+ smartlist_t *sl = smartlist_new();
+ routerset_get_all_nodes(sl, options->MiddleNodes,
+ options->ExcludeNodes, 1);
+
+ smartlist_subtract(sl, excluded);
+
+ choice = node_sl_choose_by_bandwidth(sl, WEIGHT_FOR_MID);
+ smartlist_free(sl);
+ if (choice) {
+ log_fn(LOG_INFO, LD_CIRC, "Chose fixed middle node: %s",
+ hex_str(choice->identity, DIGEST_LEN));
+ } else {
+ log_fn(LOG_NOTICE, LD_CIRC, "Restricted middle not available");
+ }
+ } else {
+ choice = router_choose_random_node(excluded, options->ExcludeNodes, flags);
+ }
smartlist_free(excluded);
return choice;
}
diff --git a/src/feature/nodelist/nodelist.c b/src/feature/nodelist/nodelist.c
index 15b3f7b60..33601fe1f 100644
--- a/src/feature/nodelist/nodelist.c
+++ b/src/feature/nodelist/nodelist.c
@@ -2350,7 +2350,7 @@ compute_frac_paths_available(const networkstatus_t *consensus,
const int authdir = authdir_mode_v3(options);
count_usable_descriptors(num_present_out, num_usable_out,
- mid, consensus, now, NULL,
+ mid, consensus, now, options->MiddleNodes,
USABLE_DESCRIPTOR_ALL);
log_debug(LD_NET,
"%s: %d present, %d usable",
diff --git a/src/feature/nodelist/routerlist.c b/src/feature/nodelist/routerlist.c
index b4d56459d..c8a658414 100644
--- a/src/feature/nodelist/routerlist.c
+++ b/src/feature/nodelist/routerlist.c
@@ -3221,6 +3221,8 @@ refresh_all_country_info(void)
routerset_refresh_countries(options->EntryNodes);
if (options->ExitNodes)
routerset_refresh_countries(options->ExitNodes);
+ if (options->MiddleNodes)
+ routerset_refresh_countries(options->MiddleNodes);
if (options->ExcludeNodes)
routerset_refresh_countries(options->ExcludeNodes);
if (options->ExcludeExitNodes)
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