tor-commits June 2018

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[tor/master] Require live consensus to compute responsible HSDirs.
by nickm＠torproject.org 20 Jun '18

20 Jun '18

commit 2520ee34c6d1b5eb83a6c3ffdaf1e8b3013b619f Author: George Kadianakis <desnacked(a)riseup.net> Date: Wed Jun 13 13:27:00 2018 +0300 Require live consensus to compute responsible HSDirs. Here is how this changes the HSv3 client-side and service-side: For service side we already required live consensus to upload descriptors (see 9e900d1db7c8c9e164b5b14d5cdd4099c1ce45f0) so we should never get there without a live consensus. For the client-side we now require a live consensus to attempt to connect to HS. While this changes the client behavior in principle, it doesn't really change it, because we always required live consensus to set HSDir indices, so before this patch a client with no live consensus would try to compute responsible HSDirs without any HSDir indices and bug out. This makes the client behavior more consistent, by requiring a live consensus (and hence a semi-synced clock) for the client to connect to an HS entirely. The alternative would have been to allow setting HSDir indices with a non-live consensus, but this would cause the various problems outlined by commit b89d2fa1db2379bffd2e2b4c851c3facc57b6ed8. --- src/or/hs_common.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/src/or/hs_common.c b/src/or/hs_common.c index 3081ad216..6f51e1d13 100644 --- a/src/or/hs_common.c +++ b/src/or/hs_common.c @@ -1332,15 +1332,17 @@ hs_get_responsible_hsdirs(const ed25519_public_key_t *blinded_pk, sorted_nodes = smartlist_new(); + /* Make sure we actually have a live consensus */ + networkstatus_t *c = networkstatus_get_live_consensus(approx_time()); + if (!c || smartlist_len(c->routerstatus_list) == 0) { + log_warn(LD_REND, "No live consensus so we can't get the responsible " + "hidden service directories."); + goto done; + } + /* Add every node_t that support HSDir v3 for which we do have a valid * hsdir_index already computed for them for this consensus. */ { - networkstatus_t *c = networkstatus_get_latest_consensus(); - if (!c || smartlist_len(c->routerstatus_list) == 0) { - log_warn(LD_REND, "No valid consensus so we can't get the responsible " - "hidden service directories."); - goto done; - } SMARTLIST_FOREACH_BEGIN(c->routerstatus_list, const routerstatus_t *, rs) { /* Even though this node_t object won't be modified and should be const, * we can't add const object in a smartlist_t. */

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[tor/master] Merge branch 'maint-0.3.4'
by nickm＠torproject.org 20 Jun '18

20 Jun '18

commit 11a76b903b283ee39ab0dbf9d926d4c4b60b7a92 Merge: 334edc22d 7b9cd5cca Author: Nick Mathewson <nickm(a)torproject.org> Date: Wed Jun 20 08:05:07 2018 -0400 Merge branch 'maint-0.3.4' changes/bug24977 | 5 +++++ src/or/hs_common.c | 17 +++++++++++------ src/or/nodelist.c | 30 ++++++++++++++++++++++++++++++ src/or/nodelist.h | 1 + src/or/voting_schedule.c | 26 +++++++++++++++++++++++++- src/or/voting_schedule.h | 4 ++++ 6 files changed, 76 insertions(+), 7 deletions(-) diff --cc src/or/nodelist.c index 5e575e9a8,ce1830083..060f5d908 --- a/src/or/nodelist.c +++ b/src/or/nodelist.c @@@ -638,17 -635,14 +643,23 @@@ nodelist_set_consensus(networkstatus_t } } SMARTLIST_FOREACH_END(node); } + + /* If the consensus is live, note down the consensus valid-after that formed + * the nodelist. */ + if (networkstatus_is_live(ns, approx_time())) { + the_nodelist->live_consensus_valid_after = ns->valid_after; + } } +/** Return 1 iff <b>node</b> has Exit flag and no BadExit flag. + * Otherwise, return 0. + */ +int +node_is_good_exit(const node_t *node) +{ + return node->is_exit && ! node->is_bad_exit; +} + /** Helper: return true iff a node has a usable amount of information*/ static inline int node_is_usable(const node_t *node)

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[tor/master] Add changes file for #24977.
by nickm＠torproject.org 20 Jun '18

20 Jun '18

commit 1f1a57b8d0038066be712c57b5ce8b7b1ea94e5a Author: George Kadianakis <desnacked(a)riseup.net> Date: Wed Jun 13 13:47:36 2018 +0300 Add changes file for #24977. --- changes/bug24977 | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/changes/bug24977 b/changes/bug24977 new file mode 100644 index 000000000..f8127a2a7 --- /dev/null +++ b/changes/bug24977 @@ -0,0 +1,5 @@ + o Minor bugfixes (onion services): + - Recompute some consensus information after clock skews or when we + transition from a non-live consensus to a live consensus. We do this to + avoid having an outdated state which could impact next-generation onion + services. Fixes bug 24977; bugfix on 0.3.2.1-alpha.

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[tor/release-0.3.4] Recreate nodelist before use if it's outdated.
by nickm＠torproject.org 20 Jun '18

20 Jun '18

commit b7b7dab00d321d2c3e2a2d52e76d9e1190836420 Author: George Kadianakis <desnacked(a)riseup.net> Date: Wed Jun 13 13:28:39 2018 +0300 Recreate nodelist before use if it's outdated. We currently only do the check when we are about to use the HSDir indices. --- src/or/hs_common.c | 3 +++ src/or/nodelist.c | 30 ++++++++++++++++++++++++++++++ src/or/nodelist.h | 1 + 3 files changed, 34 insertions(+) diff --git a/src/or/hs_common.c b/src/or/hs_common.c index 6f51e1d13..5354055bb 100644 --- a/src/or/hs_common.c +++ b/src/or/hs_common.c @@ -1340,6 +1340,9 @@ hs_get_responsible_hsdirs(const ed25519_public_key_t *blinded_pk, goto done; } + /* Ensure the nodelist is fresh, since it contains the HSDir indices. */ + nodelist_ensure_freshness(c); + /* Add every node_t that support HSDir v3 for which we do have a valid * hsdir_index already computed for them for this consensus. */ { diff --git a/src/or/nodelist.c b/src/or/nodelist.c index bc9a79940..ce1830083 100644 --- a/src/or/nodelist.c +++ b/src/or/nodelist.c @@ -113,6 +113,11 @@ typedef struct nodelist_t { /* Set of addresses that belong to nodes we believe in. */ address_set_t *node_addrs; + + /* The valid-after time of the last live consensus that initialized the + * nodelist. We use this to detect outdated nodelists that need to be + * rebuilt using a newer consensus. */ + time_t live_consensus_valid_after; } nodelist_t; static inline unsigned int @@ -630,6 +635,12 @@ nodelist_set_consensus(networkstatus_t *ns) } } SMARTLIST_FOREACH_END(node); } + + /* If the consensus is live, note down the consensus valid-after that formed + * the nodelist. */ + if (networkstatus_is_live(ns, approx_time())) { + the_nodelist->live_consensus_valid_after = ns->valid_after; + } } /** Helper: return true iff a node has a usable amount of information*/ @@ -854,6 +865,25 @@ nodelist_assert_ok(void) digestmap_free(dm, NULL); } +/** Ensure that the nodelist has been created with the most recent consensus. + * If that's not the case, make it so. */ +void +nodelist_ensure_freshness(networkstatus_t *ns) +{ + tor_assert(ns); + + /* We don't even have a nodelist: this is a NOP. */ + if (!the_nodelist) { + return; + } + + if (the_nodelist->live_consensus_valid_after != ns->valid_after) { + log_info(LD_GENERAL, "Nodelist was not fresh: rebuilding. (%d / %d)", + (int) the_nodelist->live_consensus_valid_after, + (int) ns->valid_after); + nodelist_set_consensus(ns); + } +} /** Return a list of a node_t * for every node we know about. The caller * MUST NOT modify the list. (You can set and clear flags in the nodes if * you must, but you must not add or remove nodes.) */ diff --git a/src/or/nodelist.h b/src/or/nodelist.h index 1ffba2e8d..dbe9ad18f 100644 --- a/src/or/nodelist.h +++ b/src/or/nodelist.h @@ -29,6 +29,7 @@ const node_t *node_get_by_hex_id(const char *identity_digest, node_t *nodelist_set_routerinfo(routerinfo_t *ri, routerinfo_t **ri_old_out); node_t *nodelist_add_microdesc(microdesc_t *md); void nodelist_set_consensus(networkstatus_t *ns); +void nodelist_ensure_freshness(networkstatus_t *ns); int nodelist_probably_contains_address(const tor_addr_t *addr); void nodelist_remove_microdesc(const char *identity_digest, microdesc_t *md);

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[tor/release-0.3.4] Add changes file for #24977.
by nickm＠torproject.org 20 Jun '18

20 Jun '18

1 0

[tor/master] Recreate nodelist before use if it's outdated.
by nickm＠torproject.org 20 Jun '18

20 Jun '18

1 0

[tor/master] Recreate voting schedule before use if it's outdated.
by nickm＠torproject.org 20 Jun '18

20 Jun '18

commit a686464420801c5aa58bde1babbf96d3b8520b00 Author: George Kadianakis <desnacked(a)riseup.net> Date: Tue Jun 12 14:29:06 2018 +0300 Recreate voting schedule before use if it's outdated. --- src/or/voting_schedule.c | 26 +++++++++++++++++++++++++- src/or/voting_schedule.h | 4 ++++ 2 files changed, 29 insertions(+), 1 deletion(-) diff --git a/src/or/voting_schedule.c b/src/or/voting_schedule.c index 1d66b5e22..d230a6dbc 100644 --- a/src/or/voting_schedule.c +++ b/src/or/voting_schedule.c @@ -83,6 +83,10 @@ get_voting_schedule(const or_options_t *options, time_t now, int severity) interval = (int)( consensus->fresh_until - consensus->valid_after ); vote_delay = consensus->vote_seconds; dist_delay = consensus->dist_seconds; + + /* Note down the consensus valid after, so that we detect outdated voting + * schedules in case of skewed clocks etc. */ + new_voting_schedule->live_consensus_valid_after = consensus->valid_after; } else { interval = options->TestingV3AuthInitialVotingInterval; vote_delay = options->TestingV3AuthInitialVoteDelay; @@ -138,14 +142,34 @@ voting_schedule_t voting_schedule; time_t voting_schedule_get_next_valid_after_time(void) { + time_t now = approx_time(); + bool need_to_recalculate_voting_schedule = false; + /* This is a safe guard in order to make sure that the voting schedule * static object is at least initialized. Using this function with a zeroed * voting schedule can lead to bugs. */ if (tor_mem_is_zero((const char *) &voting_schedule, sizeof(voting_schedule))) { - voting_schedule_recalculate_timing(get_options(), time(NULL)); + need_to_recalculate_voting_schedule = true; + goto done; /* no need for next check if we have to recalculate anyway */ + } + + /* Also make sure we are not using an outdated voting schedule. If we have a + * newer consensus, make sure we recalculate the voting schedule. */ + const networkstatus_t *ns = networkstatus_get_live_consensus(now); + if (ns && ns->valid_after != voting_schedule.live_consensus_valid_after) { + log_info(LD_DIR, "Voting schedule is outdated: recalculating (%d/%d)", + (int) ns->valid_after, + (int) voting_schedule.live_consensus_valid_after); + need_to_recalculate_voting_schedule = true; + } + + done: + if (need_to_recalculate_voting_schedule) { + voting_schedule_recalculate_timing(get_options(), now); voting_schedule.created_on_demand = 1; } + return voting_schedule.interval_starts; } diff --git a/src/or/voting_schedule.h b/src/or/voting_schedule.h index 4f9d58403..087701408 100644 --- a/src/or/voting_schedule.h +++ b/src/or/voting_schedule.h @@ -43,6 +43,10 @@ typedef struct { * timings only for the first vote even though this object was initilized * prior to voting. */ int created_on_demand; + + /** The valid-after time of the last live consensus that filled this voting + * schedule. It's used to detect outdated voting schedules. */ + time_t live_consensus_valid_after; } voting_schedule_t; /* Public API. */

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[tor/master] Merge branch 'asn_bug24977_final_squashed' into maint-0.3.4
by nickm＠torproject.org 20 Jun '18

20 Jun '18

commit 7b9cd5cca54d0077c0f8c163a58b055c85bf067f Merge: 4971d7afa 1f1a57b8d Author: Nick Mathewson <nickm(a)torproject.org> Date: Wed Jun 20 08:02:27 2018 -0400 Merge branch 'asn_bug24977_final_squashed' into maint-0.3.4 changes/bug24977 | 5 +++++ src/or/hs_common.c | 17 +++++++++++------ src/or/nodelist.c | 30 ++++++++++++++++++++++++++++++ src/or/nodelist.h | 1 + src/or/voting_schedule.c | 26 +++++++++++++++++++++++++- src/or/voting_schedule.h | 4 ++++ 6 files changed, 76 insertions(+), 7 deletions(-)

1 0

[tor/release-0.3.4] Require live consensus to compute responsible HSDirs.
by nickm＠torproject.org 20 Jun '18

20 Jun '18

1 0

[tor/release-0.3.4] Recreate voting schedule before use if it's outdated.
by nickm＠torproject.org 20 Jun '18

20 Jun '18

1 0

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tor-commits June 2018