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Merge branch 'maint-0.3.1'
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commit
71b9f4f0bb
7
changes/bug22753
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7
changes/bug22753
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@ -0,0 +1,7 @@
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o Major bugfixes (path selection, security):
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- When choosing which guard to use for a circuit, avoid the
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exit's family along with the exit itself. Previously, the new
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guard selection logic avoided the exit, but did not consider
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its family. Fixes bug 22753; bugfix on 0.3.0.1-alpha. Tracked
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as TROVE-2016-006 and CVE-2017-0377.
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@ -1428,6 +1428,38 @@ entry_guard_passes_filter(const or_options_t *options, guard_selection_t *gs,
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}
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}
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/** Return true iff <b>guard</b> is in the same family as <b>node</b>.
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*/
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static int
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guard_in_node_family(const entry_guard_t *guard, const node_t *node)
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{
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const node_t *guard_node = node_get_by_id(guard->identity);
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if (guard_node) {
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return nodes_in_same_family(guard_node, node);
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} else {
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/* If we don't have a node_t for the guard node, we might have
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* a bridge_info_t for it. So let's check to see whether the bridge
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* address matches has any family issues.
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*
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* (Strictly speaking, I believe this check is unnecessary, since we only
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* use it to avoid the exit's family when building circuits, and we don't
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* build multihop circuits until we have a routerinfo_t for the
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* bridge... at which point, we'll also have a node_t for the
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* bridge. Nonetheless, it seems wise to include it, in case our
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* assumptions change down the road. -nickm.)
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*/
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if (get_options()->EnforceDistinctSubnets && guard->bridge_addr) {
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tor_addr_t node_addr;
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node_get_addr(node, &node_addr);
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if (addrs_in_same_network_family(&node_addr,
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&guard->bridge_addr->addr)) {
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return 1;
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}
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}
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return 0;
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}
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}
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/**
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* Return true iff <b>guard</b> obeys the restrictions defined in <b>rst</b>.
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* (If <b>rst</b> is NULL, there are no restrictions.)
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@ -1440,7 +1472,12 @@ entry_guard_obeys_restriction(const entry_guard_t *guard,
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if (! rst)
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return 1; // No restriction? No problem.
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// Only one kind of restriction exists right now
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// Only one kind of restriction exists right now: excluding an exit
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// ID and all of its family.
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const node_t *node = node_get_by_id((const char*)rst->exclude_id);
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if (node && guard_in_node_family(guard, node))
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return 0;
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return tor_memneq(guard->identity, rst->exclude_id, DIGEST_LEN);
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}
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@ -276,16 +276,17 @@ struct entry_guard_handle_t;
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* A restriction to remember which entry guards are off-limits for a given
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* circuit.
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*
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* Right now, we only use restrictions to block a single guard from being
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* selected; this mechanism is designed to be more extensible in the future,
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* however.
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* Right now, we only use restrictions to block a single guard and its family
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* from being selected; this mechanism is designed to be more extensible in
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* the future, however.
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*
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* Note: This mechanism is NOT for recording which guards are never to be
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* used: only which guards cannot be used on <em>one particular circuit</em>.
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*/
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struct entry_guard_restriction_t {
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/**
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* The guard's RSA identity digest must not equal this.
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* The guard's RSA identity digest must not equal this; and it must not
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* be in the same family as any node with this digest.
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*/
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uint8_t exclude_id[DIGEST_LEN];
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};
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@ -1332,7 +1332,7 @@ nodelist_refresh_countries(void)
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/** Return true iff router1 and router2 have similar enough network addresses
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* that we should treat them as being in the same family */
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static inline int
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int
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addrs_in_same_network_family(const tor_addr_t *a1,
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const tor_addr_t *a2)
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{
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@ -93,6 +93,8 @@ int node_is_unreliable(const node_t *router, int need_uptime,
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int router_exit_policy_all_nodes_reject(const tor_addr_t *addr, uint16_t port,
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int need_uptime);
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void router_set_status(const char *digest, int up);
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int addrs_in_same_network_family(const tor_addr_t *a1,
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const tor_addr_t *a2);
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/** router_have_minimum_dir_info tests to see if we have enough
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* descriptor information to create circuits.
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@ -121,6 +121,8 @@ big_fake_network_setup(const struct testcase_t *testcase)
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n->is_running = n->is_valid = n->is_fast = n->is_stable = 1;
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/* Note: all these guards have the same address, so you'll need to
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* disable EnforceDistinctSubnets when a restriction is applied. */
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n->rs->addr = 0x04020202;
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n->rs->or_port = 1234;
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n->rs->is_v2_dir = 1;
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@ -1846,14 +1848,17 @@ test_entry_guard_select_for_circuit_confirmed(void *arg)
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tt_uint_op(state, OP_EQ, GUARD_CIRC_STATE_USABLE_IF_NO_BETTER_GUARD);
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tt_i64_op(g2->last_tried_to_connect, OP_EQ, approx_time());
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// If we say that the next confirmed guard in order is excluded, we get
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// The one AFTER that.
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// If we say that the next confirmed guard in order is excluded, and
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// we disable EnforceDistinctSubnets, we get the guard AFTER the
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// one we excluded.
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get_options_mutable()->EnforceDistinctSubnets = 0;
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g = smartlist_get(gs->confirmed_entry_guards,
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smartlist_len(gs->primary_entry_guards)+2);
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entry_guard_restriction_t rst;
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memset(&rst, 0, sizeof(rst));
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memcpy(rst.exclude_id, g->identity, DIGEST_LEN);
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g2 = select_entry_guard_for_circuit(gs, GUARD_USAGE_TRAFFIC, &rst, &state);
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tt_ptr_op(g2, OP_NE, NULL);
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tt_ptr_op(g2, OP_NE, g);
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tt_int_op(g2->confirmed_idx, OP_EQ,
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smartlist_len(gs->primary_entry_guards)+3);
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@ -1873,6 +1878,16 @@ test_entry_guard_select_for_circuit_confirmed(void *arg)
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tt_assert(g->is_pending);
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tt_int_op(g->confirmed_idx, OP_EQ, -1);
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// If we EnforceDistinctSubnets and apply a restriction, we get
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// nothing, since we put all of the nodes in the same /16.
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// Regression test for bug 22753/TROVE-2017-006.
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get_options_mutable()->EnforceDistinctSubnets = 1;
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g = smartlist_get(gs->confirmed_entry_guards, 0);
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memset(&rst, 0, sizeof(rst));
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memcpy(rst.exclude_id, g->identity, DIGEST_LEN);
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g2 = select_entry_guard_for_circuit(gs, GUARD_USAGE_TRAFFIC, &rst, &state);
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tt_ptr_op(g2, OP_EQ, NULL);
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done:
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guard_selection_free(gs);
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}
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