commit be4a60945d724ca964d9d53f57cad6190a500077 Author: Neel Chauhan neel@neelc.org Date: Sun Aug 25 20:22:57 2019 -0400

Check IPv6 exit policies on microdescriptors in node_exit_policy_rejects_all() --- changes/bug27284 | 5 +++++ src/feature/dirparse/microdesc_parse.c | 11 +++++++++++ src/feature/nodelist/microdesc_st.h | 2 ++ src/feature/nodelist/nodelist.c | 3 +-- 4 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/changes/bug27284 b/changes/bug27284 new file mode 100644 index 000000000..14fc2082f --- /dev/null +++ b/changes/bug27284 @@ -0,0 +1,5 @@ + o Minor bugfixes (ipv6): + - When parsing microdescriptors, we should check the IPv6 exit policy + alongside IPv4. Previously, we checked both exit policies for only + router info structures, while microdescriptors were IPv4-only. Fixes + bug 27284; bugfix on 0.2.3.1-alpha. Patch by Neel Chauhan. diff --git a/src/feature/dirparse/microdesc_parse.c b/src/feature/dirparse/microdesc_parse.c index 22cc1e272..e02dfcf11 100644 --- a/src/feature/dirparse/microdesc_parse.c +++ b/src/feature/dirparse/microdesc_parse.c @@ -92,6 +92,12 @@ find_start_of_next_microdesc(const char *s, const char *eos) #undef NEXT_LINE }

+static inline int +policy_is_reject_star_or_null(struct short_policy_t *policy) +{ + return !policy || short_policy_is_reject_star(policy); +} + /** Parse as many microdescriptors as are found from the string starting at * <b>s</b> and ending at <b>eos</b>. If allow_annotations is set, read any * annotations we recognize and ignore ones we don't. @@ -250,6 +256,11 @@ microdescs_parse_from_string(const char *s, const char *eos, md->ipv6_exit_policy = parse_short_policy(tok->args[0]); }

+ if (policy_is_reject_star_or_null(md->exit_policy) && + policy_is_reject_star_or_null(md->ipv6_exit_policy)) { + md->policy_is_reject_star = 1; + } + smartlist_add(result, md); okay = 1;

diff --git a/src/feature/nodelist/microdesc_st.h b/src/feature/nodelist/microdesc_st.h index c8265cb77..e017c46c7 100644 --- a/src/feature/nodelist/microdesc_st.h +++ b/src/feature/nodelist/microdesc_st.h @@ -33,6 +33,8 @@ struct microdesc_t { unsigned int no_save : 1; /** If true, this microdesc has an entry in the microdesc_map */ unsigned int held_in_map : 1; + /** True iff the exit policy for this router rejects everything. */ + unsigned int policy_is_reject_star : 1; /** Reference count: how many node_ts have a reference to this microdesc? */ unsigned int held_by_nodes;

diff --git a/src/feature/nodelist/nodelist.c b/src/feature/nodelist/nodelist.c index 21914c6c6..6ae8d2bcb 100644 --- a/src/feature/nodelist/nodelist.c +++ b/src/feature/nodelist/nodelist.c @@ -1424,8 +1424,7 @@ node_exit_policy_rejects_all(const node_t *node) if (node->ri) return node->ri->policy_is_reject_star; else if (node->md) - return node->md->exit_policy == NULL || - short_policy_is_reject_star(node->md->exit_policy); + return node->md->policy_is_reject_star; else return 1; }