[tor-commits] [tor] 02/03: ignore families for L2 guard independence

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dgoulet pushed a commit to branch main
in repository tor.

commit d48eaff86d5d2bd0df2b0974abf28652934b5cc6
Author: Roger Dingledine <arma at torproject.org>
AuthorDate: Tue Aug 9 16:39:26 2022 -0400

    ignore families for L2 guard independence
    
    mike is concerned that we would get too much exposure to adversaries,
    if we enforce that none of our L2 guards can be in the same family.
    
    this change set now essentially finishes the feature that commit a77727cdc
    was attempting to add, but strips the "_and_family" part of that plan.
---
 changes/bug40639                |  6 +++---
 src/feature/client/entrynodes.c | 10 ++++++----
 2 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/changes/bug40639 b/changes/bug40639
index d5ab2e0cb3..d975e9ad22 100644
--- a/changes/bug40639
+++ b/changes/bug40639
@@ -1,5 +1,5 @@
   o Major bugfixes (vanguards):
     - We had omitted some checks for whether our vanguards (second layer
-      guards from proposal 333) overlapped or came from the same family.
-      Now make sure to pick each of them to be independent. Fixes bug
-      40639; bugfix on 0.4.7.1-alpha.
+      guards from proposal 333) overlapped. Now make sure to pick each
+      of them to be independent. Also, change the design to allow them to
+      come from the same family. Fixes bug 40639; bugfix on 0.4.7.1-alpha.
diff --git a/src/feature/client/entrynodes.c b/src/feature/client/entrynodes.c
index 493571173e..e7324487da 100644
--- a/src/feature/client/entrynodes.c
+++ b/src/feature/client/entrynodes.c
@@ -4139,10 +4139,11 @@ maintain_layer2_guards(void)
   /* First gather the exclusions based on our current L2 guards */
   smartlist_t *excluded = smartlist_new();
   SMARTLIST_FOREACH_BEGIN(layer2_guards, layer2_guard_t *, g) {
-    /* Exclude existing L2 guard + family so that we don't double-pick. */
+    /* Exclude existing L2 guard so that we don't double-pick it.
+     * But, it's ok if they come from the same family. */
     const node_t *existing = node_get_by_id(g->identity);
     if (existing)
-      nodelist_add_node_and_family(excluded, existing);
+      smartlist_add(excluded, (node_t *)existing);
   } SMARTLIST_FOREACH_END(g);
 
   /* Add required guards to the list */
@@ -4167,8 +4168,9 @@ maintain_layer2_guards(void)
     // Nickname can also be None here because it is looked up later
     control_event_guard("None", layer2_guard->identity,
                         "GOOD_L2");
-    /* Exclude this node and its family so that we don't double-pick. */
-    nodelist_add_node_and_family(excluded, choice);
+    /* Exclude this node so that we don't double-pick it. (Again, coming
+     * from the same family is ok here.) */
+    smartlist_add(excluded, (node_t *)choice);
   }
 
   /* Some cleanup */

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