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addr: Validate identity key when getting a suggestion

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We do look at the address but with this we also look if the identity digest of
the relay suggesting us an address is a trusted source.

Related to #40022

Signed-off-by: David Goulet <dgoulet@torproject.org>
This commit is contained in:
David Goulet 2020-07-08 07:46:12 -04:00
parent 15be1ff8ad
commit 9b2cadb492
3 changed files with 10 additions and 5 deletions
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3
src/core/or/channeltls.c
View File

@ -1934,7 +1934,8 @@ channel_tls_process_netinfo_cell(cell_t *cell, channel_tls_t *chan)
* we were unable to resolve it previously. The endpoint address is passed
* in order to make sure to never consider an address that is the same as
* our endpoint. */
relay_address_new_suggestion(&my_apparent_addr, &chan->conn->real_addr);
relay_address_new_suggestion(&my_apparent_addr, &chan->conn->real_addr,
identity_digest);
if (! chan->conn->handshake_state->sent_netinfo) {
/* If we were prepared to authenticate, but we never got an AUTH_CHALLENGE

9
src/feature/relay/relay_find_addr.c
View File

@ -55,12 +55,14 @@ router_guess_address_from_dir_headers(uint32_t *guess)
* passes. */
void
relay_address_new_suggestion(const tor_addr_t *suggested_addr,
const tor_addr_t *peer_addr)
const tor_addr_t *peer_addr,
const char *identity_digest)
{
const or_options_t *options = get_options();
tor_assert(suggested_addr);
tor_assert(peer_addr);
tor_assert(identity_digest);
/* This should never be called on a non Tor relay. */
if (BUG(!server_mode(options))) {
@ -68,8 +70,9 @@ relay_address_new_suggestion(const tor_addr_t *suggested_addr,
}
/* Is the peer a trusted source? Ignore anything coming from non trusted
* source. In this case, we only look at trusted authorities. */
if (!router_addr_is_trusted_dir(peer_addr)) {
* source. In this case, we only look at trusted directory authorities. */
if (!router_addr_is_trusted_dir(peer_addr) ||
!router_digest_is_trusted_dir(identity_digest)) {
return;
}

3
src/feature/relay/relay_find_addr.h
View File

@ -16,7 +16,8 @@ void router_new_address_suggestion(const char *suggestion,
const dir_connection_t *d_conn);
void relay_address_new_suggestion(const tor_addr_t *suggested_addr,
const tor_addr_t *peer_addr);
const tor_addr_t *peer_addr,
const char *identity_digest);
#ifdef RELAY_FIND_ADDR_PRIVATE