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prop224: Connect to v3 services in connection_ap_handle_onion().

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Recognize and handle v3 addresses.

Signed-off-by: David Goulet <dgoulet@torproject.org>
This commit is contained in:
George Kadianakis 2017-06-01 14:17:49 +03:00 committed by David Goulet
parent c754864cfd
commit 776e796d96
1 changed files with 90 additions and 32 deletions
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80
src/or/connection_edge.c
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@ -76,6 +76,8 @@
#include "dirserv.h"
#include "hibernate.h"
#include "hs_common.h"
#include "hs_cache.h"
#include "hs_client.h"
#include "hs_circuit.h"
#include "main.h"
#include "nodelist.h"
@ -1392,10 +1394,13 @@ connection_ap_handshake_rewrite(entry_connection_t *conn,
}
}
/** We just received a SOCKS request in <b>conn</b> to an onion address of type
* <b>addresstype</b>. Start connecting to the onion service. */
static int
connection_ap_handle_onion(entry_connection_t *conn,
socks_request_t *socks,
origin_circuit_t *circ)
origin_circuit_t *circ,
hostname_type_t addresstype)
{
time_t now = approx_time();
connection_t *base_conn = ENTRY_TO_CONN(conn);
@ -1432,6 +1437,14 @@ connection_ap_handle_onion(entry_connection_t *conn,
return -1;
}
/* Interface: Regardless of HS version after the block below we should have
set onion_address, rend_cache_lookup_result, and descriptor_is_usable. */
const char *onion_address = NULL;
int rend_cache_lookup_result = -ENOENT;
int descriptor_is_usable = 0;
if (addresstype == ONION_V2_HOSTNAME) { /* it's a v2 hidden service */
rend_cache_entry_t *entry = NULL;
/* Look up if we have client authorization configured for this hidden
* service. If we do, associate it with the rend_data. */
rend_service_authorization_t *client_auth =
@ -1454,16 +1467,51 @@ connection_ap_handle_onion(entry_connection_t *conn,
if (rend_data == NULL) {
return -1;
}
const char *onion_address = rend_data_get_address(rend_data);
onion_address = rend_data_get_address(rend_data);
log_info(LD_REND,"Got a hidden service request for ID '%s'",
safe_str_client(onion_address));
rend_cache_lookup_result = rend_cache_lookup_entry(onion_address,-1,
&entry);
if (!rend_cache_lookup_result && entry) {
descriptor_is_usable = rend_client_any_intro_points_usable(entry);
}
} else { /* it's a v3 hidden service */
tor_assert(addresstype == ONION_V3_HOSTNAME);
const hs_descriptor_t *cached_desc = NULL;
int retval;
/* Create HS conn identifier with HS pubkey */
hs_ident_edge_conn_t *hs_conn_ident =
tor_malloc_zero(sizeof(hs_ident_edge_conn_t));
retval = hs_parse_address(socks->address, &hs_conn_ident->identity_pk,
NULL, NULL);
if (retval < 0) {
log_warn(LD_GENERAL, "failed to parse hs address");
tor_free(hs_conn_ident);
return -1;
}
ENTRY_TO_EDGE_CONN(conn)->hs_ident = hs_conn_ident;
onion_address = socks->address;
/* Check the v3 desc cache */
cached_desc = hs_cache_lookup_as_client(&hs_conn_ident->identity_pk);
if (cached_desc) {
rend_cache_lookup_result = 0;
descriptor_is_usable = hs_client_any_intro_points_usable(cached_desc);
log_info(LD_GENERAL, "Found %s descriptor in cache for %s. %s.",
(descriptor_is_usable) ? "usable" : "unusable",
safe_str_client(onion_address),
(descriptor_is_usable) ? "Not fetching." : "Refecting.");
} else {
rend_cache_lookup_result = -ENOENT;
}
}
/* Lookup the given onion address. If invalid, stop right now.
* Otherwise, we might have it in the cache or not. */
unsigned int refetch_desc = 0;
rend_cache_entry_t *entry = NULL;
const int rend_cache_lookup_result =
rend_cache_lookup_entry(onion_address, -1, &entry);
if (rend_cache_lookup_result < 0) {
switch (-rend_cache_lookup_result) {
case EINVAL:
@ -1474,6 +1522,8 @@ connection_ap_handle_onion(entry_connection_t *conn,
return -1;
case ENOENT:
/* We didn't have this; we should look it up. */
log_info(LD_REND, "No descriptor found in our cache for %s. Fetching.",
safe_str_client(onion_address));
refetch_desc = 1;
break;
default:
@ -1491,12 +1541,18 @@ connection_ap_handle_onion(entry_connection_t *conn,
/* Now we have a descriptor but is it usable or not? If not, refetch.
* Also, a fetch could have been requested if the onion address was not
* found in the cache previously. */
if (refetch_desc || !rend_client_any_intro_points_usable(entry)) {
if (refetch_desc || !descriptor_is_usable) {
edge_connection_t *edge_conn = ENTRY_TO_EDGE_CONN(conn);
connection_ap_mark_as_non_pending_circuit(conn);
base_conn->state = AP_CONN_STATE_RENDDESC_WAIT;
log_info(LD_REND, "Unknown descriptor %s. Fetching.",
safe_str_client(onion_address));
rend_client_refetch_v2_renddesc(rend_data);
if (addresstype == ONION_V2_HOSTNAME) {
tor_assert(edge_conn->rend_data);
rend_client_refetch_v2_renddesc(edge_conn->rend_data);
} else {
tor_assert(addresstype == ONION_V3_HOSTNAME);
tor_assert(edge_conn->hs_ident);
hs_client_refetch_hsdesc(&edge_conn->hs_ident->identity_pk);
}
return 0;
}
@ -1676,7 +1732,7 @@ connection_ap_handshake_rewrite_and_attach(entry_connection_t *conn,
}
/* Now, we handle everything that isn't a .onion address. */
if (addresstype != ONION_V2_HOSTNAME) {
if (addresstype != ONION_V2_HOSTNAME && addresstype != ONION_V3_HOSTNAME) {
/* Not a hidden-service request. It's either a hostname or an IP,
* possibly with a .exit that we stripped off. We're going to check
* if we're allowed to connect/resolve there, and then launch the
@ -1954,8 +2010,10 @@ connection_ap_handshake_rewrite_and_attach(entry_connection_t *conn,
return 0;
} else {
/* If we get here, it's a request for a .onion address! */
tor_assert(addresstype == ONION_V2_HOSTNAME ||
addresstype == ONION_V3_HOSTNAME);
tor_assert(!automap);
if (connection_ap_handle_onion(conn, socks, circ) < 0) {
if (connection_ap_handle_onion(conn, socks, circ, addresstype) < 0) {
return -1;
}
}