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Merge remote-tracking branch 'dgoulet/bug14847_027_06'

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This commit is contained in:
Nick Mathewson 2015-04-23 12:24:35 -04:00
commit 54000d7ad9
10 changed files with 570 additions and 133 deletions
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210
src/or/control.c
View File

@ -37,6 +37,8 @@
#include "nodelist.h"
#include "policies.h"
#include "reasons.h"
#include "rendclient.h"
#include "rendcommon.h"
#include "rephist.h"
#include "router.h"
#include "routerlist.h"
@ -159,6 +161,8 @@ static int handle_control_resolve(control_connection_t *conn, uint32_t len,
static int handle_control_usefeature(control_connection_t *conn,
uint32_t len,
const char *body);
static int handle_control_hsfetch(control_connection_t *conn, uint32_t len,
const char *body);
static int write_stream_target_to_buf(entry_connection_t *conn, char *buf,
size_t len);
static void orconn_target_get_name(char *buf, size_t len,
@ -943,6 +947,7 @@ static const struct control_event_t control_event_table[] = {
{ EVENT_CIRC_BANDWIDTH_USED, "CIRC_BW" },
{ EVENT_TRANSPORT_LAUNCHED, "TRANSPORT_LAUNCHED" },
{ EVENT_HS_DESC, "HS_DESC" },
{ EVENT_HS_DESC_CONTENT, "HS_DESC_CONTENT" },
{ 0, NULL },
};
@ -3276,6 +3281,113 @@ handle_control_dropguards(control_connection_t *conn,
return 0;
}
/** Implementation for the HSFETCH command. */
static int
handle_control_hsfetch(control_connection_t *conn, uint32_t len,
const char *body)
{
int i;
char digest[DIGEST_LEN], *hsaddress = NULL, *arg1 = NULL, *desc_id = NULL;
smartlist_t *args = NULL, *hsdirs = NULL;
(void) len; /* body is nul-terminated; it's safe to ignore the length */
static const char *hsfetch_command = "HSFETCH";
static const char *v2_str = "v2-";
const size_t v2_str_len = strlen(v2_str);
rend_data_t *rend_query = NULL;
/* Make sure we have at least one argument, the HSAddress. */
args = getargs_helper(hsfetch_command, conn, body, 1, -1);
if (!args) {
goto exit;
}
/* Extract the first argument (either HSAddress or DescID). */
arg1 = smartlist_get(args, 0);
/* Test if it's an HS address without the .onion part. */
if (rend_valid_service_id(arg1)) {
hsaddress = arg1;
} else if (strcmpstart(arg1, v2_str) == 0 &&
rend_valid_descriptor_id(arg1 + v2_str_len) &&
base32_decode(digest, sizeof(digest), arg1 + v2_str_len,
REND_DESC_ID_V2_LEN_BASE32) == 0) {
/* We have a well formed version 2 descriptor ID. Keep the decoded value
* of the id. */
desc_id = digest;
} else {
connection_printf_to_buf(conn, "513 Unrecognized \"%s\"\r\n",
arg1);
goto done;
}
static const char *opt_server = "SERVER=";
/* Skip first argument because it's the HSAddress or DescID. */
for (i = 1; i < smartlist_len(args); ++i) {
const char *arg = smartlist_get(args, i);
const node_t *node;
if (!strcasecmpstart(arg, opt_server)) {
const char *server;
server = arg + strlen(opt_server);
node = node_get_by_hex_id(server);
if (!node) {
connection_printf_to_buf(conn, "552 Server \"%s\" not found\r\n",
server);
goto done;
}
if (!hsdirs) {
/* Stores routerstatus_t object for each specified server. */
hsdirs = smartlist_new();
}
/* Valid server, add it to our local list. */
smartlist_add(hsdirs, node->rs);
} else {
connection_printf_to_buf(conn, "513 Unexpected argument \"%s\"\r\n",
arg);
goto done;
}
}
rend_query = tor_malloc_zero(sizeof(*rend_query));
if (hsaddress) {
strncpy(rend_query->onion_address, hsaddress,
sizeof(rend_query->onion_address));
} else if (desc_id) {
/* Using a descriptor ID, we force the user to provide at least one
* hsdir server using the SERVER= option. */
if (!hsdirs || !smartlist_len(hsdirs)) {
connection_printf_to_buf(conn, "512 %s option is required\r\n",
opt_server);
goto done;
}
memcpy(rend_query->descriptor_id, desc_id,
sizeof(rend_query->descriptor_id));
} else {
/* We can't get in here because of the first argument check. */
tor_assert(0);
}
/* We are about to trigger HSDir fetch so send the OK now because after
* that 650 event(s) are possible so better to have the 250 OK before them
* to avoid out of order replies. */
send_control_done(conn);
/* Trigger the fetch using the built rend query and possibly a list of HS
* directory to use. This function ignores the client cache thus this will
* always send a fetch command. */
rend_client_fetch_v2_desc(rend_query, hsdirs);
done:
SMARTLIST_FOREACH(args, char *, cp, tor_free(cp));
smartlist_free(args);
/* Contains data pointer that we don't own thus no cleanup. */
smartlist_free(hsdirs);
tor_free(rend_query);
exit:
return 0;
}
/** Called when <b>conn</b> has no more bytes left on its outbuf. */
int
connection_control_finished_flushing(control_connection_t *conn)
@ -3573,6 +3685,9 @@ connection_control_process_inbuf(control_connection_t *conn)
} else if (!strcasecmp(conn->incoming_cmd, "DROPGUARDS")) {
if (handle_control_dropguards(conn, cmd_data_len, args))
return -1;
} else if (!strcasecmp(conn->incoming_cmd, "HSFETCH")) {
if (handle_control_hsfetch(conn, cmd_data_len, args))
return -1;
} else {
connection_printf_to_buf(conn, "510 Unrecognized command \"%s\"\r\n",
conn->incoming_cmd);
@ -5241,6 +5356,31 @@ node_describe_longname_by_id,(const char *id_digest))
return longname;
}
/** Return either the onion address if the given pointer is a non empty
* string else the unknown string. */
static const char *
rend_hsaddress_str_or_unknown(const char *onion_address)
{
static const char *str_unknown = "UNKNOWN";
const char *str_ret = str_unknown;
/* No valid pointer, unknown it is. */
if (!onion_address) {
goto end;
}
/* Empty onion address thus we don't know, unknown it is. */
if (onion_address[0] == '\0') {
goto end;
}
/* All checks are good so return the given onion address. */
str_ret = onion_address;
end:
return str_ret;
}
/** send HS_DESC requested event.
*
* <b>rend_query</b> is used to fetch requested onion address and auth type.
@ -5261,7 +5401,7 @@ control_event_hs_descriptor_requested(const rend_data_t *rend_query,
send_control_event(EVENT_HS_DESC, ALL_FORMATS,
"650 HS_DESC REQUESTED %s %s %s %s\r\n",
rend_query->onion_address,
rend_hsaddress_str_or_unknown(rend_query->onion_address),
rend_auth_type_to_string(rend_query->auth_type),
node_describe_longname_by_id(id_digest),
desc_id_base32);
@ -5277,15 +5417,16 @@ control_event_hs_descriptor_requested(const rend_data_t *rend_query,
*/
void
control_event_hs_descriptor_receive_end(const char *action,
const rend_data_t *rend_query,
const char *onion_address,
rend_auth_type_t auth_type,
const char *id_digest,
const char *reason)
{
char *reason_field = NULL;
if (!action || !rend_query || !id_digest) {
log_warn(LD_BUG, "Called with action==%p, rend_query==%p, "
"id_digest==%p", action, rend_query, id_digest);
if (!action || !id_digest || !onion_address) {
log_warn(LD_BUG, "Called with action==%p, id_digest==%p "
"onion_address==%p", action, id_digest, onion_address);
return;
}
@ -5296,8 +5437,8 @@ control_event_hs_descriptor_receive_end(const char *action,
send_control_event(EVENT_HS_DESC, ALL_FORMATS,
"650 HS_DESC %s %s %s %s%s\r\n",
action,
rend_query->onion_address,
rend_auth_type_to_string(rend_query->auth_type),
rend_hsaddress_str_or_unknown(onion_address),
rend_auth_type_to_string(auth_type),
node_describe_longname_by_id(id_digest),
reason_field ? reason_field : "");
@ -5309,16 +5450,16 @@ control_event_hs_descriptor_receive_end(const char *action,
* called when a we successfully received a hidden service descriptor.
*/
void
control_event_hs_descriptor_received(const rend_data_t *rend_query,
control_event_hs_descriptor_received(const char *onion_address,
rend_auth_type_t auth_type,
const char *id_digest)
{
if (!rend_query || !id_digest) {
log_warn(LD_BUG, "Called with rend_query==%p, id_digest==%p",
rend_query, id_digest);
if (!id_digest) {
log_warn(LD_BUG, "Called with id_digest==%p", id_digest);
return;
}
control_event_hs_descriptor_receive_end("RECEIVED", rend_query,
id_digest, NULL);
control_event_hs_descriptor_receive_end("RECEIVED", onion_address,
auth_type, id_digest, NULL);
}
/** Send HS_DESC event to inform controller that query <b>rend_query</b>
@ -5327,19 +5468,52 @@ control_event_hs_descriptor_received(const rend_data_t *rend_query,
* field.
*/
void
control_event_hs_descriptor_failed(const rend_data_t *rend_query,
control_event_hs_descriptor_failed(const char *onion_address,
rend_auth_type_t auth_type,
const char *id_digest,
const char *reason)
{
if (!rend_query || !id_digest) {
log_warn(LD_BUG, "Called with rend_query==%p, id_digest==%p",
rend_query, id_digest);
if (!id_digest) {
log_warn(LD_BUG, "Called with id_digest==%p", id_digest);
return;
}
control_event_hs_descriptor_receive_end("FAILED", rend_query,
control_event_hs_descriptor_receive_end("FAILED", onion_address, auth_type,
id_digest, reason);
}
/** send HS_DESC_CONTENT event after completion of a successful fetch from
* hs directory. */
void
control_event_hs_descriptor_content(const char *onion_address,
const char *desc_id,
const char *hsdir_id_digest,
const char *content)
{
static const char *event_name = "HS_DESC_CONTENT";
char *esc_content = NULL;
if (!onion_address || !desc_id || !hsdir_id_digest) {
log_warn(LD_BUG, "Called with onion_address==%p, desc_id==%p, "
"hsdir_id_digest==%p", onion_address, desc_id, hsdir_id_digest);
return;
}
if (content == NULL) {
/* Point it to empty content so it can still be escaped. */
content = "";
}
write_escaped_data(content, strlen(content), &esc_content);
send_control_event(EVENT_HS_DESC_CONTENT, ALL_FORMATS,
"650+%s %s %s %s\r\n%s650 OK\r\n",
event_name,
rend_hsaddress_str_or_unknown(onion_address),
desc_id,
node_describe_longname_by_id(hsdir_id_digest),
esc_content);
tor_free(esc_content);
}
/** Free any leftover allocated memory of the control.c subsystem. */
void
control_free_all(void)

24
src/or/control.h
View File

@ -107,14 +107,21 @@ void control_event_hs_descriptor_requested(const rend_data_t *rend_query,
const char *desc_id_base32,
const char *hs_dir);
void control_event_hs_descriptor_receive_end(const char *action,
const rend_data_t *rend_query,
const char *hs_dir,
const char *reason);
void control_event_hs_descriptor_received(const rend_data_t *rend_query,
const char *hs_dir);
void control_event_hs_descriptor_failed(const rend_data_t *rend_query,
const char *hs_dir,
const char *onion_address,
rend_auth_type_t auth_type,
const char *id_digest,
const char *reason);
void control_event_hs_descriptor_received(const char *onion_address,
rend_auth_type_t auth_type,
const char *id_digest);
void control_event_hs_descriptor_failed(const char *onion_address,
rend_auth_type_t auth_type,
const char *id_digest,
const char *reason);
void control_event_hs_descriptor_content(const char *onion_address,
const char *desc_id,
const char *hsdir_fp,
const char *content);
void control_free_all(void);
@ -158,7 +165,8 @@ void control_free_all(void);
#define EVENT_CIRC_BANDWIDTH_USED 0x001D
#define EVENT_TRANSPORT_LAUNCHED 0x0020
#define EVENT_HS_DESC 0x0021
#define EVENT_MAX_ 0x0021
#define EVENT_HS_DESC_CONTENT 0x0022
#define EVENT_MAX_ 0x0022
/* sizeof(control_connection_t.event_mask) in bits, currently a uint64_t */
#define EVENT_CAPACITY_ 0x0040

38
src/or/directory.c
View File

@ -2099,17 +2099,27 @@ connection_dir_client_reached_eof(dir_connection_t *conn)
if (conn->base_.purpose == DIR_PURPOSE_FETCH_RENDDESC_V2) {
#define SEND_HS_DESC_FAILED_EVENT(reason) ( \
control_event_hs_descriptor_failed(conn->rend_data, \
control_event_hs_descriptor_failed(conn->rend_data->onion_address, \
conn->rend_data->auth_type, \
conn->identity_digest, \
reason) )
#define SEND_HS_DESC_FAILED_CONTENT() ( \
control_event_hs_descriptor_content(conn->rend_data->onion_address, \
conn->requested_resource, \
conn->identity_digest, \
NULL) )
tor_assert(conn->rend_data);
log_info(LD_REND,"Received rendezvous descriptor (size %d, status %d "
"(%s))",
(int)body_len, status_code, escaped(reason));
switch (status_code) {
case 200:
{
rend_cache_entry_t *entry = NULL;
switch (rend_cache_store_v2_desc_as_client(body,
conn->requested_resource, conn->rend_data)) {
conn->requested_resource, conn->rend_data,
&entry)) {
case RCS_BADDESC:
case RCS_NOTDIR: /* Impossible */
log_warn(LD_REND,"Fetching v2 rendezvous descriptor failed. "
@ -2117,25 +2127,41 @@ connection_dir_client_reached_eof(dir_connection_t *conn)
/* We'll retry when connection_about_to_close_connection()
* cleans this dir conn up. */
SEND_HS_DESC_FAILED_EVENT("BAD_DESC");
SEND_HS_DESC_FAILED_CONTENT();
break;
case RCS_OKAY:
default:
{
char service_id[REND_SERVICE_ID_LEN_BASE32 + 1];
/* Should never be NULL here for an OKAY returned code. */
tor_assert(entry);
rend_get_service_id(entry->parsed->pk, service_id);
/* success. notify pending connections about this. */
log_info(LD_REND, "Successfully fetched v2 rendezvous "
"descriptor.");
control_event_hs_descriptor_received(conn->rend_data,
control_event_hs_descriptor_received(service_id,
conn->rend_data->auth_type,
conn->identity_digest);
control_event_hs_descriptor_content(service_id,
conn->requested_resource,
conn->identity_digest,
body);
conn->base_.purpose = DIR_PURPOSE_HAS_FETCHED_RENDDESC_V2;
rend_client_desc_trynow(conn->rend_data->onion_address);
rend_client_desc_trynow(service_id);
memwipe(service_id, 0, sizeof(service_id));
break;
}
}
break;
}
case 404:
/* Not there. We'll retry when
* connection_about_to_close_connection() cleans this conn up. */
log_info(LD_REND,"Fetching v2 rendezvous descriptor failed: "
"Retrying at another directory.");
SEND_HS_DESC_FAILED_EVENT("NOT_FOUND");
SEND_HS_DESC_FAILED_CONTENT();
break;
case 400:
log_warn(LD_REND, "Fetching v2 rendezvous descriptor failed: "
@ -2143,6 +2169,7 @@ connection_dir_client_reached_eof(dir_connection_t *conn)
"v2 rendezvous query? Retrying at another directory.",
escaped(reason));
SEND_HS_DESC_FAILED_EVENT("QUERY_REJECTED");
SEND_HS_DESC_FAILED_CONTENT();
break;
default:
log_warn(LD_REND, "Fetching v2 rendezvous descriptor failed: "
@ -2152,6 +2179,7 @@ connection_dir_client_reached_eof(dir_connection_t *conn)
status_code, escaped(reason), conn->base_.address,
conn->base_.port);
SEND_HS_DESC_FAILED_EVENT("UNEXPECTED");
SEND_HS_DESC_FAILED_CONTENT();
break;
}
}
@ -3066,7 +3094,7 @@ directory_handle_command_get(dir_connection_t *conn, const char *headers,
/* Handle v2 rendezvous descriptor fetch request. */
const char *descp;
const char *query = url + strlen("/tor/rendezvous2/");
if (strlen(query) == REND_DESC_ID_V2_LEN_BASE32) {
if (rend_valid_descriptor_id(query)) {
log_info(LD_REND, "Got a v2 rendezvous descriptor request for ID '%s'",
safe_str(escaped(query)));
switch (rend_cache_lookup_v2_desc_as_dir(query, &descp)) {

4
src/or/or.h
View File

@ -799,6 +799,10 @@ typedef struct rend_data_t {
/** Authorization type for accessing a service used by a client. */
rend_auth_type_t auth_type;
/** Descriptor ID for a client request. The control port command HSFETCH
* can use this. */
char descriptor_id[DIGEST_LEN];
/** Hash of the hidden service's PK used by a service. */
char rend_pk_digest[DIGEST_LEN];

296
src/or/rendclient.c
View File

@ -496,15 +496,13 @@ get_last_hid_serv_requests(void)
REND_SERVICE_ID_LEN_BASE32)
/** Look up the last request time to hidden service directory <b>hs_dir</b>
* for descriptor ID <b>desc_id_base32</b> for the service specified in
* <b>rend_query</b>. If <b>set</b> is non-zero,
* assign the current time <b>now</b> and return that. Otherwise, return
* the most recent request time, or 0 if no such request has been sent
* before. */
* for descriptor ID <b>desc_id_base32</b>. If <b>set</b> is non-zero,
* assign the current time <b>now</b> and return that. Otherwise, return the
* most recent request time, or 0 if no such request has been sent before.
*/
static time_t
lookup_last_hid_serv_request(routerstatus_t *hs_dir,
const char *desc_id_base32,
const rend_data_t *rend_query,
time_t now, int set)
{
char hsdir_id_base32[REND_DESC_ID_V2_LEN_BASE32 + 1];
@ -513,10 +511,9 @@ lookup_last_hid_serv_request(routerstatus_t *hs_dir,
strmap_t *last_hid_serv_requests = get_last_hid_serv_requests();
base32_encode(hsdir_id_base32, sizeof(hsdir_id_base32),
hs_dir->identity_digest, DIGEST_LEN);
tor_snprintf(hsdir_desc_comb_id, sizeof(hsdir_desc_comb_id), "%s%s%s",
tor_snprintf(hsdir_desc_comb_id, sizeof(hsdir_desc_comb_id), "%s%s",
hsdir_id_base32,
desc_id_base32,
rend_query->onion_address);
desc_id_base32);
/* XXX023 tor_assert(strlen(hsdir_desc_comb_id) ==
LAST_HID_SERV_REQUEST_KEY_LEN); */
if (set) {
@ -609,64 +606,53 @@ rend_client_purge_last_hid_serv_requests(void)
}
}
/** Determine the responsible hidden service directories for <b>desc_id</b>
* and fetch the descriptor with that ID from one of them. Only
* send a request to a hidden service directory that we have not yet tried
* during this attempt to connect to this hidden service; on success, return 1,
* in the case that no hidden service directory is left to ask for the
* descriptor, return 0, and in case of a failure -1. */
static int
directory_get_from_hs_dir(const char *desc_id, const rend_data_t *rend_query)
/** This returns a good valid hs dir that should be used for the given
* descriptor id.
*
* Return NULL on error else the hsdir node pointer. */
static routerstatus_t *
pick_hsdir(const char *desc_id, const char *desc_id_base32)
{
smartlist_t *responsible_dirs = smartlist_new();
smartlist_t *usable_responsible_dirs = smartlist_new();
const or_options_t *options = get_options();
routerstatus_t *hs_dir;
char desc_id_base32[REND_DESC_ID_V2_LEN_BASE32 + 1];
time_t now = time(NULL);
char descriptor_cookie_base64[3*REND_DESC_COOKIE_LEN_BASE64];
#ifdef ENABLE_TOR2WEB_MODE
const int tor2web_mode = options->Tor2webMode;
const int how_to_fetch = tor2web_mode ? DIRIND_ONEHOP : DIRIND_ANONYMOUS;
#else
const int how_to_fetch = DIRIND_ANONYMOUS;
#endif
int excluded_some;
tor_assert(desc_id);
tor_assert(rend_query);
/* Determine responsible dirs. Even if we can't get all we want,
* work with the ones we have. If it's empty, we'll notice below. */
tor_assert(desc_id_base32);
/* Determine responsible dirs. Even if we can't get all we want, work with
* the ones we have. If it's empty, we'll notice below. */
hid_serv_get_responsible_directories(responsible_dirs, desc_id);
base32_encode(desc_id_base32, sizeof(desc_id_base32),
desc_id, DIGEST_LEN);
/* Only select those hidden service directories to which we did not send
* a request recently and for which we have a router descriptor here. */
/* Clean request history first. */
directory_clean_last_hid_serv_requests(now);
SMARTLIST_FOREACH(responsible_dirs, routerstatus_t *, dir, {
time_t last = lookup_last_hid_serv_request(
dir, desc_id_base32, rend_query, 0, 0);
const node_t *node = node_get_by_id(dir->identity_digest);
if (last + REND_HID_SERV_DIR_REQUERY_PERIOD >= now ||
!node || !node_has_descriptor(node)) {
SMARTLIST_DEL_CURRENT(responsible_dirs, dir);
continue;
}
if (! routerset_contains_node(options->ExcludeNodes, node)) {
smartlist_add(usable_responsible_dirs, dir);
}
});
/* Only select those hidden service directories to which we did not send a
* request recently and for which we have a router descriptor here. */
SMARTLIST_FOREACH_BEGIN(responsible_dirs, routerstatus_t *, dir) {
time_t last = lookup_last_hid_serv_request(dir, desc_id_base32,
0, 0);
const node_t *node = node_get_by_id(dir->identity_digest);
if (last + REND_HID_SERV_DIR_REQUERY_PERIOD >= now ||
!node || !node_has_descriptor(node)) {
SMARTLIST_DEL_CURRENT(responsible_dirs, dir);
continue;
}
if (!routerset_contains_node(options->ExcludeNodes, node)) {
smartlist_add(usable_responsible_dirs, dir);
}
} SMARTLIST_FOREACH_END(dir);
excluded_some =
smartlist_len(usable_responsible_dirs) < smartlist_len(responsible_dirs);
hs_dir = smartlist_choose(usable_responsible_dirs);
if (! hs_dir && ! options->StrictNodes)
if (!hs_dir && !options->StrictNodes) {
hs_dir = smartlist_choose(responsible_dirs);
}
smartlist_free(responsible_dirs);
smartlist_free(usable_responsible_dirs);
@ -679,14 +665,52 @@ directory_get_from_hs_dir(const char *desc_id, const rend_data_t *rend_query)
"requested hidden service: they are all either down or "
"excluded, and StrictNodes is set.");
}
return 0;
} else {
/* Remember that we are requesting a descriptor from this hidden service
* directory now. */
lookup_last_hid_serv_request(hs_dir, desc_id_base32, now, 1);
}
/* Remember that we are requesting a descriptor from this hidden service
* directory now. */
lookup_last_hid_serv_request(hs_dir, desc_id_base32, rend_query, now, 1);
return hs_dir;
}
/* Encode descriptor cookie for logging purposes. */
/** Determine the responsible hidden service directories for <b>desc_id</b>
* and fetch the descriptor with that ID from one of them. Only
* send a request to a hidden service directory that we have not yet tried
* during this attempt to connect to this hidden service; on success, return 1,
* in the case that no hidden service directory is left to ask for the
* descriptor, return 0, and in case of a failure -1. */
static int
directory_get_from_hs_dir(const char *desc_id, const rend_data_t *rend_query,
routerstatus_t *rs_hsdir)
{
routerstatus_t *hs_dir = rs_hsdir;
char desc_id_base32[REND_DESC_ID_V2_LEN_BASE32 + 1];
char descriptor_cookie_base64[3*REND_DESC_COOKIE_LEN_BASE64];
#ifdef ENABLE_TOR2WEB_MODE
const int tor2web_mode = get_options()->Tor2webMode;
const int how_to_fetch = tor2web_mode ? DIRIND_ONEHOP : DIRIND_ANONYMOUS;
#else
const int how_to_fetch = DIRIND_ANONYMOUS;
#endif
tor_assert(desc_id);
base32_encode(desc_id_base32, sizeof(desc_id_base32),
desc_id, DIGEST_LEN);
/* Automatically pick an hs dir if none given. */
if (!rs_hsdir) {
hs_dir = pick_hsdir(desc_id, desc_id_base32);
if (!hs_dir) {
/* No suitable hs dir can be found, stop right now. */
return 0;
}
}
/* Encode descriptor cookie for logging purposes. Also, if the cookie is
* malformed, no fetch is triggered thus this needs to be done before the
* fetch request. */
if (rend_query->auth_type != REND_NO_AUTH) {
if (base64_encode(descriptor_cookie_base64,
sizeof(descriptor_cookie_base64),
@ -727,16 +751,136 @@ directory_get_from_hs_dir(const char *desc_id, const rend_data_t *rend_query)
return 1;
}
/** Fetch a v2 descriptor using the given descriptor id. If any hsdir(s) are
* given, they will be used instead.
*
* On success, 1 is returned. If no hidden service is left to ask, return 0.
* On error, -1 is returned. */
static int
fetch_v2_desc_by_descid(const char *desc_id, const rend_data_t *rend_query,
smartlist_t *hsdirs)
{
int ret;
tor_assert(rend_query);
if (!hsdirs) {
ret = directory_get_from_hs_dir(desc_id, rend_query, NULL);
goto end; /* either success or failure, but we're done */
}
/* Using the given hsdir list, trigger a fetch on each of them. */
SMARTLIST_FOREACH_BEGIN(hsdirs, routerstatus_t *, hs_dir) {
/* This should always be a success. */
ret = directory_get_from_hs_dir(desc_id, rend_query, hs_dir);
tor_assert(ret);
} SMARTLIST_FOREACH_END(hs_dir);
/* Everything went well. */
ret = 0;
end:
return ret;
}
/** Fetch a v2 descriptor using the onion address in the given query object.
* This will compute the descriptor id for each replicas and fetch it on the
* given hsdir(s) if any or the responsible ones that are choosen
* automatically.
*
* On success, 1 is returned. If no hidden service is left to ask, return 0.
* On error, -1 is returned. */
static int
fetch_v2_desc_by_addr(const rend_data_t *query,
smartlist_t *hsdirs)
{
char descriptor_id[DIGEST_LEN];
int replicas_left_to_try[REND_NUMBER_OF_NON_CONSECUTIVE_REPLICAS];
int i, tries_left, ret;
tor_assert(query);
/* Randomly iterate over the replicas until a descriptor can be fetched
* from one of the consecutive nodes, or no options are left. */
for (i = 0; i < REND_NUMBER_OF_NON_CONSECUTIVE_REPLICAS; i++) {
replicas_left_to_try[i] = i;
}
tries_left = REND_NUMBER_OF_NON_CONSECUTIVE_REPLICAS;
while (tries_left > 0) {
int rand = crypto_rand_int(tries_left);
int chosen_replica = replicas_left_to_try[rand];
replicas_left_to_try[rand] = replicas_left_to_try[--tries_left];
ret = rend_compute_v2_desc_id(descriptor_id, query->onion_address,
query->auth_type == REND_STEALTH_AUTH ?
query->descriptor_cookie : NULL,
time(NULL), chosen_replica);
if (ret < 0) {
/* Normally, on failure the descriptor_id is untouched but let's be
* safe in general in case the function changes at some point. */
goto end;
}
/* Trigger the fetch with the computed descriptor ID. */
ret = fetch_v2_desc_by_descid(descriptor_id, query, hsdirs);
if (ret != 0) {
/* Either on success or failure, as long as we tried a fetch we are
* done here. */
goto end;
}
}
/* If we come here, there are no hidden service directories left. */
log_info(LD_REND, "Could not pick one of the responsible hidden "
"service directories to fetch descriptors, because "
"we already tried them all unsuccessfully.");
ret = 0;
end:
memwipe(descriptor_id, 0, sizeof(descriptor_id));
return ret;
}
/** Fetch a v2 descriptor using the given query. If any hsdir are specified,
* use them for the fetch.
*
* On success, 1 is returned. If no hidden service is left to ask, return 0.
* On error, -1 is returned. */
int
rend_client_fetch_v2_desc(const rend_data_t *query,
smartlist_t *hsdirs)
{
int ret;
tor_assert(query);
/* Depending on what's available in the rend data query object, we will
* trigger a fetch by HS address or using a descriptor ID. */
if (query->onion_address[0] != '\0') {
ret = fetch_v2_desc_by_addr(query, hsdirs);
} else if (query->descriptor_id[0] != '\0') {
ret = fetch_v2_desc_by_descid(query->descriptor_id, query, hsdirs);
} else {
/* Query data is invalid. */
ret = -1;
goto error;
}
error:
return ret;
}
/** Unless we already have a descriptor for <b>rend_query</b> with at least
* one (possibly) working introduction point in it, start a connection to a
* hidden service directory to fetch a v2 rendezvous service descriptor. */
void
rend_client_refetch_v2_renddesc(const rend_data_t *rend_query)
{
char descriptor_id[DIGEST_LEN];
int replicas_left_to_try[REND_NUMBER_OF_NON_CONSECUTIVE_REPLICAS];
int i, tries_left;
int ret;
rend_cache_entry_t *e = NULL;
tor_assert(rend_query);
/* Are we configured to fetch descriptors? */
if (!get_options()->FetchHidServDescriptors) {
@ -753,44 +897,12 @@ rend_client_refetch_v2_renddesc(const rend_data_t *rend_query)
}
log_debug(LD_REND, "Fetching v2 rendezvous descriptor for service %s",
safe_str_client(rend_query->onion_address));
/* Randomly iterate over the replicas until a descriptor can be fetched
* from one of the consecutive nodes, or no options are left. */
tries_left = REND_NUMBER_OF_NON_CONSECUTIVE_REPLICAS;
for (i = 0; i < REND_NUMBER_OF_NON_CONSECUTIVE_REPLICAS; i++)
replicas_left_to_try[i] = i;
while (tries_left > 0) {
int rand = crypto_rand_int(tries_left);
int chosen_replica = replicas_left_to_try[rand];
replicas_left_to_try[rand] = replicas_left_to_try[--tries_left];
if (rend_compute_v2_desc_id(descriptor_id, rend_query->onion_address,
rend_query->auth_type == REND_STEALTH_AUTH ?
rend_query->descriptor_cookie : NULL,
time(NULL), chosen_replica) < 0) {
log_warn(LD_REND, "Internal error: Computing v2 rendezvous "
"descriptor ID did not succeed.");
/*
* Hmm, can this write anything to descriptor_id and still fail?
* Let's clear it just to be safe.
*
* From here on, any returns should goto done which clears
* descriptor_id so we don't leave key-derived material on the stack.
*/
goto done;
}
if (directory_get_from_hs_dir(descriptor_id, rend_query) != 0)
goto done; /* either success or failure, but we're done */
ret = rend_client_fetch_v2_desc(rend_query, NULL);
if (ret <= 0) {
/* Close pending connections on error or if no hsdir can be found. */
rend_client_desc_trynow(rend_query->onion_address);
}
/* If we come here, there are no hidden service directories left. */
log_info(LD_REND, "Could not pick one of the responsible hidden "
"service directories to fetch descriptors, because "
"we already tried them all unsuccessfully.");
/* Close pending connections. */
rend_client_desc_trynow(rend_query->onion_address);
done:
memwipe(descriptor_id, 0, sizeof(descriptor_id));
return;
}

2
src/or/rendclient.h
View File

@ -20,6 +20,8 @@ int rend_client_introduction_acked(origin_circuit_t *circ,
const uint8_t *request,
size_t request_len);
void rend_client_refetch_v2_renddesc(const rend_data_t *rend_query);
int rend_client_fetch_v2_desc(const rend_data_t *query,
smartlist_t *hsdirs);
void rend_client_cancel_descriptor_fetches(void);
void rend_client_purge_last_hid_serv_requests(void);

38
src/or/rendcommon.c
View File

@ -920,6 +920,24 @@ rend_valid_service_id(const char *query)
return 1;
}
/** Return true iff <b>query</b> is a syntactically valid descriptor ID.
* (as generated by rend_get_descriptor_id_bytes). */
int
rend_valid_descriptor_id(const char *query)
{
if (strlen(query) != REND_DESC_ID_V2_LEN_BASE32) {
goto invalid;
}
if (strspn(query, BASE32_CHARS) != REND_DESC_ID_V2_LEN_BASE32) {
goto invalid;
}
return 1;
invalid:
return 0;
}
/** Lookup in the client cache the given service ID <b>query</b> for
* <b>version</b>.
*
@ -1137,12 +1155,14 @@ rend_cache_store_v2_desc_as_dir(const char *desc)
* If the descriptor's descriptor ID doesn't match <b>desc_id_base32</b>,
* reject it.
*
* Return an appropriate rend_cache_store_status_t.
* Return an appropriate rend_cache_store_status_t. If entry is not NULL,
* set it with the cache entry pointer of the descriptor.
*/
rend_cache_store_status_t
rend_cache_store_v2_desc_as_client(const char *desc,
const char *desc_id_base32,
const rend_data_t *rend_query)
const rend_data_t *rend_query,
rend_cache_entry_t **entry)
{
/*XXXX this seems to have a bit of duplicate code with
* rend_cache_store_v2_desc_as_dir(). Fix that. */
@ -1175,6 +1195,9 @@ rend_cache_store_v2_desc_as_client(const char *desc,
tor_assert(desc);
tor_assert(desc_id_base32);
memset(want_desc_id, 0, sizeof(want_desc_id));
if (entry) {
*entry = NULL;
}
if (base32_decode(want_desc_id, sizeof(want_desc_id),
desc_id_base32, strlen(desc_id_base32)) != 0) {
log_warn(LD_BUG, "Couldn't decode base32 %s for descriptor id.",
@ -1193,7 +1216,8 @@ rend_cache_store_v2_desc_as_client(const char *desc,
log_warn(LD_REND, "Couldn't compute service ID.");
goto err;
}
if (strcmp(rend_query->onion_address, service_id)) {
if (rend_query->onion_address[0] != '\0' &&
strcmp(rend_query->onion_address, service_id)) {
log_warn(LD_REND, "Received service descriptor for service ID %s; "
"expected descriptor for service ID %s.",
service_id, safe_str(rend_query->onion_address));
@ -1240,7 +1264,7 @@ rend_cache_store_v2_desc_as_client(const char *desc,
"service descriptor for %s. This is probably a (misguided) "
"attempt to improve reliability, but it could also be an "
"attempt to do a guard enumeration attack. Rejecting.",
safe_str_client(rend_query->onion_address));
safe_str_client(service_id));
goto err;
}
@ -1286,9 +1310,15 @@ rend_cache_store_v2_desc_as_client(const char *desc,
rend_cache_increment_allocation(rend_cache_entry_allocation(e));
log_debug(LD_REND,"Successfully stored rend desc '%s', len %d.",
safe_str_client(service_id), (int)encoded_size);
if (entry) {
*entry = e;
}
return RCS_OKAY;
okay:
if (entry) {
*entry = e;
}
retval = RCS_OKAY;
err:

4
src/or/rendcommon.h
View File

@ -37,6 +37,7 @@ void rend_cache_clean_v2_descs_as_dir(time_t now, size_t min_to_remove);
void rend_cache_purge(void);
void rend_cache_free_all(void);
int rend_valid_service_id(const char *query);
int rend_valid_descriptor_id(const char *query);
int rend_cache_lookup_entry(const char *query, int version,
rend_cache_entry_t **entry_out);
int rend_cache_lookup_v2_desc_as_dir(const char *query, const char **desc);
@ -50,7 +51,8 @@ typedef enum {
rend_cache_store_status_t rend_cache_store_v2_desc_as_dir(const char *desc);
rend_cache_store_status_t rend_cache_store_v2_desc_as_client(const char *desc,
const char *desc_id_base32,
const rend_data_t *rend_query);
const rend_data_t *rend_query,
rend_cache_entry_t **entry);
int rend_encode_v2_descriptors(smartlist_t *descs_out,
rend_service_descriptor_t *desc, time_t now,
uint8_t period, rend_auth_type_t auth_type,

3
src/or/routerparse.c
View File

@ -4575,8 +4575,7 @@ rend_parse_v2_service_descriptor(rend_service_descriptor_t **parsed_out,
tok = find_by_keyword(tokens, R_RENDEZVOUS_SERVICE_DESCRIPTOR);
tor_assert(tok == smartlist_get(tokens, 0));
tor_assert(tok->n_args == 1);
if (strlen(tok->args[0]) != REND_DESC_ID_V2_LEN_BASE32 ||
strspn(tok->args[0], BASE32_CHARS) != REND_DESC_ID_V2_LEN_BASE32) {
if (!rend_valid_descriptor_id(tok->args[0])) {
log_warn(LD_REND, "Invalid descriptor ID: '%s'", tok->args[0]);
goto err;
}

84
src/test/test_hs.c
View File

@ -28,6 +28,68 @@
#define STR_HSDIR_NONE_EXIST_LONGNAME \
"$BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB"
/* DuckDuckGo descriptor as an example. */
static const char *hs_desc_content = "\
rendezvous-service-descriptor g5ojobzupf275beh5ra72uyhb3dkpxwg\r\n\
version 2\r\n\
permanent-key\r\n\
-----BEGIN RSA PUBLIC KEY-----\r\n\
MIGJAoGBAJ/SzzgrXPxTlFrKVhXh3buCWv2QfcNgncUpDpKouLn3AtPH5Ocys0jE\r\n\
aZSKdvaiQ62md2gOwj4x61cFNdi05tdQjS+2thHKEm/KsB9BGLSLBNJYY356bupg\r\n\
I5gQozM65ENelfxYlysBjJ52xSDBd8C4f/p9umdzaaaCmzXG/nhzAgMBAAE=\r\n\
-----END RSA PUBLIC KEY-----\r\n\
secret-id-part anmjoxxwiupreyajjt5yasimfmwcnxlf\r\n\
publication-time 2015-03-11 19:00:00\r\n\
protocol-versions 2,3\r\n\
introduction-points\r\n\
-----BEGIN MESSAGE-----\r\n\
aW50cm9kdWN0aW9uLXBvaW50IDd1bnd4cmg2dG5kNGh6eWt1Z3EzaGZzdHduc2ll\r\n\
cmhyCmlwLWFkZHJlc3MgMTg4LjEzOC4xMjEuMTE4Cm9uaW9uLXBvcnQgOTAwMQpv\r\n\
bmlvbi1rZXkKLS0tLS1CRUdJTiBSU0EgUFVCTElDIEtFWS0tLS0tCk1JR0pBb0dC\r\n\
QUxGRVVyeVpDbk9ROEhURmV5cDVjMTRObWVqL1BhekFLTTBxRENTNElKUWh0Y3g1\r\n\
NXpRSFdOVWIKQ2hHZ0JqR1RjV3ZGRnA0N3FkdGF6WUZhVXE2c0lQKzVqeWZ5b0Q4\r\n\
UmJ1bzBwQmFWclJjMmNhYUptWWM0RDh6Vgpuby9sZnhzOVVaQnZ1cWY4eHIrMDB2\r\n\
S0JJNmFSMlA2OE1WeDhrMExqcUpUU2RKOE9idm9yQWdNQkFBRT0KLS0tLS1FTkQg\r\n\
UlNBIFBVQkxJQyBLRVktLS0tLQpzZXJ2aWNlLWtleQotLS0tLUJFR0lOIFJTQSBQ\r\n\
VUJMSUMgS0VZLS0tLS0KTUlHSkFvR0JBTnJHb0ozeTlHNXQzN2F2ekI1cTlwN1hG\r\n\
VUplRUVYMUNOaExnWmJXWGJhVk5OcXpoZFhyL0xTUQppM1Z6dW5OaUs3cndUVnE2\r\n\
K2QyZ1lRckhMMmIvMXBBY3ZKWjJiNSs0bTRRc0NibFpjRENXTktRbHJnRWN5WXRJ\r\n\
CkdscXJTbFFEaXA0ZnNrUFMvNDVkWTI0QmJsQ3NGU1k3RzVLVkxJck4zZFpGbmJr\r\n\
NEZIS1hBZ01CQUFFPQotLS0tLUVORCBSU0EgUFVCTElDIEtFWS0tLS0tCmludHJv\r\n\
ZHVjdGlvbi1wb2ludCBiNGM3enlxNXNheGZzN2prNXFibG1wN3I1b3pwdHRvagpp\r\n\
cC1hZGRyZXNzIDEwOS4xNjkuNDUuMjI2Cm9uaW9uLXBvcnQgOTAwMQpvbmlvbi1r\r\n\
ZXkKLS0tLS1CRUdJTiBSU0EgUFVCTElDIEtFWS0tLS0tCk1JR0pBb0dCQU8xSXpw\r\n\
WFFUTUY3RXZUb1NEUXpzVnZiRVFRQUQrcGZ6NzczMVRXZzVaUEJZY1EyUkRaeVp4\r\n\
OEQKNUVQSU1FeUE1RE83cGd0ak5LaXJvYXJGMC8yempjMkRXTUlSaXZyU29YUWVZ\r\n\
ZXlMM1pzKzFIajJhMDlCdkYxZAp6MEswblRFdVhoNVR5V3lyMHdsbGI1SFBnTlI0\r\n\
MS9oYkprZzkwZitPVCtIeGhKL1duUml2QWdNQkFBRT0KLS0tLS1FTkQgUlNBIFBV\r\n\
QkxJQyBLRVktLS0tLQpzZXJ2aWNlLWtleQotLS0tLUJFR0lOIFJTQSBQVUJMSUMg\r\n\
S0VZLS0tLS0KTUlHSkFvR0JBSzNWZEJ2ajFtQllLL3JrcHNwcm9Ub0llNUtHVmth\r\n\
QkxvMW1tK1I2YUVJek1VZFE1SjkwNGtyRwpCd3k5NC8rV0lGNFpGYXh5Z2phejl1\r\n\
N2pKY1k3ZGJhd1pFeG1hYXFCRlRwL2h2ZG9rcHQ4a1ByRVk4OTJPRHJ1CmJORUox\r\n\
N1FPSmVMTVZZZk5Kcjl4TWZCQ3JQai8zOGh2RUdrbWVRNmRVWElvbVFNaUJGOVRB\r\n\
Z01CQUFFPQotLS0tLUVORCBSU0EgUFVCTElDIEtFWS0tLS0tCmludHJvZHVjdGlv\r\n\
bi1wb2ludCBhdjVtcWl0Y2Q3cjJkandsYmN0c2Jlc2R3eGt0ZWtvegppcC1hZGRy\r\n\
ZXNzIDE0NC43Ni44LjczCm9uaW9uLXBvcnQgNDQzCm9uaW9uLWtleQotLS0tLUJF\r\n\
R0lOIFJTQSBQVUJMSUMgS0VZLS0tLS0KTUlHSkFvR0JBTzVweVZzQmpZQmNmMXBE\r\n\
dklHUlpmWXUzQ05nNldka0ZLMGlvdTBXTGZtejZRVDN0NWhzd3cyVwpjejlHMXhx\r\n\
MmN0Nkd6VWkrNnVkTDlITTRVOUdHTi9BbW8wRG9GV1hKWHpBQkFXd2YyMVdsd1lW\r\n\
eFJQMHRydi9WCkN6UDkzcHc5OG5vSmdGUGRUZ05iMjdKYmVUZENLVFBrTEtscXFt\r\n\
b3NveUN2RitRa25vUS9BZ01CQUFFPQotLS0tLUVORCBSU0EgUFVCTElDIEtFWS0t\r\n\
LS0tCnNlcnZpY2Uta2V5Ci0tLS0tQkVHSU4gUlNBIFBVQkxJQyBLRVktLS0tLQpN\r\n\
SUdKQW9HQkFMVjNKSmtWN3lTNU9jc1lHMHNFYzFQOTVRclFRR3ZzbGJ6Wi9zRGxl\r\n\
RlpKYXFSOUYvYjRUVERNClNGcFMxcU1GbldkZDgxVmRGMEdYRmN2WVpLamRJdHU2\r\n\
SndBaTRJeEhxeXZtdTRKdUxrcXNaTEFLaXRLVkx4eGsKeERlMjlDNzRWMmJrOTRJ\r\n\
MEgybTNKS2tzTHVwc3VxWWRVUmhOVXN0SElKZmgyZmNIalF0bEFnTUJBQUU9Ci0t\r\n\
LS0tRU5EIFJTQSBQVUJMSUMgS0VZLS0tLS0KCg==\r\n\
-----END MESSAGE-----\r\n\
signature\r\n\
-----BEGIN SIGNATURE-----\r\n\
d4OuCE5OLAOnRB6cQN6WyMEmg/BHem144Vec+eYgeWoKwx3MxXFplUjFxgnMlmwN\r\n\
PcftsZf2ztN0sbNCtPgDL3d0PqvxY3iHTQAI8EbaGq/IAJUZ8U4y963dD5+Bn6JQ\r\n\
myE3ctmh0vy5+QxSiRjmQBkuEpCyks7LvWvHYrhnmcg=\r\n\
-----END SIGNATURE-----";
/* Helper global variable for hidden service descriptor event test.
* It's used as a pointer to dynamically created message buffer in
* send_control_event_string_replacement function, which mocks
@ -70,6 +132,7 @@ test_hs_desc_event(void *arg)
{
#define STR_HS_ADDR "ajhb7kljbiru65qo"
#define STR_HS_ID "b3oeducbhjmbqmgw2i3jtz4fekkrinwj"
#define STR_DESC_ID "g5ojobzupf275beh5ra72uyhb3dkpxwg"
rend_data_t rend_query;
const char *expected_msg;
@ -96,7 +159,8 @@ test_hs_desc_event(void *arg)
/* test received event */
rend_query.auth_type = 1;
control_event_hs_descriptor_received(&rend_query, HSDIR_EXIST_ID);
control_event_hs_descriptor_received(rend_query.onion_address,
rend_query.auth_type, HSDIR_EXIST_ID);
expected_msg = "650 HS_DESC RECEIVED "STR_HS_ADDR" BASIC_AUTH "\
STR_HSDIR_EXIST_LONGNAME"\r\n";
tt_assert(received_msg);
@ -105,7 +169,8 @@ test_hs_desc_event(void *arg)
/* test failed event */
rend_query.auth_type = 2;
control_event_hs_descriptor_failed(&rend_query, HSDIR_NONE_EXIST_ID,
control_event_hs_descriptor_failed(rend_query.onion_address,
rend_query.auth_type, HSDIR_NONE_EXIST_ID,
"QUERY_REJECTED");
expected_msg = "650 HS_DESC FAILED "STR_HS_ADDR" STEALTH_AUTH "\
STR_HSDIR_NONE_EXIST_LONGNAME" REASON=QUERY_REJECTED\r\n";
@ -115,7 +180,8 @@ test_hs_desc_event(void *arg)
/* test invalid auth type */
rend_query.auth_type = 999;
control_event_hs_descriptor_failed(&rend_query, HSDIR_EXIST_ID,
control_event_hs_descriptor_failed(rend_query.onion_address,
rend_query.auth_type, HSDIR_EXIST_ID,
"QUERY_REJECTED");
expected_msg = "650 HS_DESC FAILED "STR_HS_ADDR" UNKNOWN "\
STR_HSDIR_EXIST_LONGNAME" REASON=QUERY_REJECTED\r\n";
@ -123,6 +189,18 @@ test_hs_desc_event(void *arg)
tt_str_op(received_msg,OP_EQ, expected_msg);
tor_free(received_msg);
/* test valid content. */
char *exp_msg;
control_event_hs_descriptor_content(rend_query.onion_address, STR_DESC_ID,
HSDIR_EXIST_ID, hs_desc_content);
tor_asprintf(&exp_msg, "650+HS_DESC_CONTENT " STR_HS_ADDR " " STR_DESC_ID \
" " STR_HSDIR_EXIST_LONGNAME "\r\n%s\r\n.\r\n650 OK\r\n",
hs_desc_content);
tt_assert(received_msg);
tt_str_op(received_msg, OP_EQ, exp_msg);
tor_free(received_msg);
tor_free(exp_msg);
done:
UNMOCK(send_control_event_string);
UNMOCK(node_describe_longname_by_id);