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Merge branch 'ticket30924_042_04_squashed_merged'

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This commit is contained in:
Nick Mathewson 2019-09-09 12:35:27 -04:00
commit 6846d14868
32 changed files with 1702 additions and 187 deletions
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6
changes/ticket30924 Normal file
View File

@ -0,0 +1,6 @@
o Major features (onion service v3, denial of service):
- Add onion service introduction denial of service defenses. They consist of
rate limiting client introduction at the intro point using parameters that
can be sent by the service within the ESTABLISH_INTRO cell. If the cell
extension for this is not used, the intro point will honor the consensus
parameters. Closes ticket 30924.

46
doc/tor.1.txt
View File

@ -2915,7 +2915,13 @@ on the public Tor network.
HIDDEN SERVICE OPTIONS
----------------------
The following options are used to configure a hidden service.
The following options are used to configure a hidden service. Some options
apply per service and some apply for the whole tor instance.
The next section describes the per service options that can only be set
**after** the **HiddenServiceDir** directive
**PER SERVICE OPTIONS:**
[[HiddenServiceDir]] **HiddenServiceDir** __DIRECTORY__::
Store data files for a hidden service in DIRECTORY. Every hidden service
@ -2941,12 +2947,6 @@ The following options are used to configure a hidden service.
connects to that VIRTPORT, one of the TARGETs from those lines will be
chosen at random. Note that address-port pairs have to be comma-separated.
[[PublishHidServDescriptors]] **PublishHidServDescriptors** **0**|**1**::
If set to 0, Tor will run any hidden services you configure, but it won't
advertise them to the rendezvous directory. This option is only useful if
you're using a Tor controller that handles hidserv publishing for you.
(Default: 1)
[[HiddenServiceVersion]] **HiddenServiceVersion** **2**|**3**::
A list of rendezvous service descriptor versions to publish for the hidden
service. Currently, versions 2 and 3 are supported. (Default: 3)
@ -3025,6 +3025,38 @@ The following options are used to configure a hidden service.
Number of introduction points the hidden service will have. You can't
have more than 10 for v2 service and 20 for v3. (Default: 3)
[[HiddenServiceEnableIntroDoSDefense]] **HiddenServiceEnableIntroDoSDefense** **0**|**1**::
Enable DoS defense at the intropoint level. When this is enabled, the
rate and burst parameter (see below) will be sent to the intro point which
will then use them to apply rate limiting for introduction request to this
service.
+
The introduction point honors the consensus parameters except if this is
specifically set by the service operator using this option. The service
never looks at the consensus parameters in order to enable or disable this
defense. (Default: 0)
[[HiddenServiceEnableIntroDoSRatePerSec]] **HiddenServiceEnableIntroDoSRatePerSec** __NUM__::
The allowed client introduction rate per second at the introduction
point. If this option is 0, it is considered infinite and thus if
**HiddenServiceEnableIntroDoSDefense** is set, it then effectively
disables the defenses. (Default: 25)
[[HiddenServiceEnableIntroDoSBurstPerSec]] **HiddenServiceEnableIntroDoSBurstPerSec** __NUM__::
The allowed client introduction burst per second at the introduction
point. If this option is 0, it is considered infinite and thus if
**HiddenServiceEnableIntroDoSDefense** is set, it then effectively
disables the defenses. (Default: 200)
**PER INSTANCE OPTIONS:**
[[PublishHidServDescriptors]] **PublishHidServDescriptors** **0**|**1**::
If set to 0, Tor will run any hidden services you configure, but it won't
advertise them to the rendezvous directory. This option is only useful if
you're using a Tor controller that handles hidserv publishing for you.
(Default: 1)
[[HiddenServiceSingleHopMode]] **HiddenServiceSingleHopMode** **0**|**1**::
**Experimental - Non Anonymous** Hidden Services on a tor instance in
HiddenServiceSingleHopMode make one-hop (direct) circuits between the onion

26
scripts/maint/practracker/exceptions.txt
View File

@ -44,7 +44,6 @@ problem function-size /src/app/config/config.c:parse_dir_authority_line() 150
problem function-size /src/app/config/config.c:parse_dir_fallback_line() 101
problem function-size /src/app/config/config.c:parse_port_config() 446
problem function-size /src/app/config/config.c:parse_ports() 168
problem function-size /src/app/config/config.c:getinfo_helper_config() 113
problem file-size /src/app/config/or_options_st.h 1112
problem include-count /src/app/main/main.c 68
problem function-size /src/app/main/main.c:dumpstats() 102
@ -81,8 +80,8 @@ problem dependency-violation /src/core/mainloop/netstatus.c 4
problem dependency-violation /src/core/mainloop/periodic.c 2
problem dependency-violation /src/core/or/address_set.c 1
problem file-size /src/core/or/channel.c 3487
problem file-size /src/core/or/channel.h 780
problem dependency-violation /src/core/or/channel.c 9
problem file-size /src/core/or/channel.h 780
problem dependency-violation /src/core/or/channelpadding.c 6
problem function-size /src/core/or/channeltls.c:channel_tls_handle_var_cell() 160
problem function-size /src/core/or/channeltls.c:channel_tls_process_versions_cell() 170
@ -105,10 +104,10 @@ problem dependency-violation /src/core/or/circuitlist.c 19
problem function-size /src/core/or/circuitmux.c:circuitmux_set_policy() 109
problem function-size /src/core/or/circuitmux.c:circuitmux_attach_circuit() 113
problem dependency-violation /src/core/or/circuitmux_ewma.c 2
problem file-size /src/core/or/circuitpadding.c 3043
problem function-size /src/core/or/circuitpadding.c:circpad_machine_schedule_padding() 107
problem file-size /src/core/or/circuitpadding.h 809
problem file-size /src/core/or/circuitpadding.c 3096
problem function-size /src/core/or/circuitpadding.c:circpad_machine_schedule_padding() 113
problem dependency-violation /src/core/or/circuitpadding.c 6
problem file-size /src/core/or/circuitpadding.h 813
problem function-size /src/core/or/circuitpadding_machines.c:circpad_machine_relay_hide_intro_circuits() 103
problem function-size /src/core/or/circuitpadding_machines.c:circpad_machine_client_hide_rend_circuits() 112
problem dependency-violation /src/core/or/circuitpadding_machines.c 1
@ -142,19 +141,19 @@ problem include-count /src/core/or/connection_or.c 51
problem function-size /src/core/or/connection_or.c:connection_or_group_set_badness_() 105
problem function-size /src/core/or/connection_or.c:connection_or_client_learned_peer_id() 142
problem function-size /src/core/or/connection_or.c:connection_or_compute_authenticate_cell_body() 231
problem file-size /src/core/or/or.h 1103
problem include-count /src/core/or/or.h 49
problem dependency-violation /src/core/or/connection_or.c 20
problem dependency-violation /src/core/or/dos.c 5
problem dependency-violation /src/core/or/onion.c 2
problem file-size /src/core/or/or.h 1107
problem include-count /src/core/or/or.h 49
problem dependency-violation /src/core/or/or_periodic.c 1
problem file-size /src/core/or/policies.c 3249
problem function-size /src/core/or/policies.c:policy_summarize() 107
problem dependency-violation /src/core/or/policies.c 14
problem function-size /src/core/or/protover.c:protover_all_supported() 117
problem function-size /src/core/or/relay.c:circuit_receive_relay_cell() 127
problem file-size /src/core/or/relay.c 3263
problem dependency-violation /src/core/or/reasons.c 2
problem file-size /src/core/or/relay.c 3264
problem function-size /src/core/or/relay.c:circuit_receive_relay_cell() 127
problem function-size /src/core/or/relay.c:relay_send_command_from_edge_() 109
problem function-size /src/core/or/relay.c:connection_ap_process_end_not_open() 192
problem function-size /src/core/or/relay.c:connection_edge_process_relay_cell_not_open() 137
@ -237,18 +236,19 @@ problem function-size /src/feature/dirparse/parsecommon.c:get_next_token() 158
problem function-size /src/feature/dirparse/routerparse.c:router_parse_entry_from_string() 554
problem function-size /src/feature/dirparse/routerparse.c:extrainfo_parse_entry_from_string() 208
problem function-size /src/feature/hibernate/hibernate.c:accounting_parse_options() 109
problem function-size /src/feature/hs/hs_cell.c:hs_cell_build_establish_intro() 113
problem function-size /src/feature/hs/hs_cell.c:hs_cell_build_establish_intro() 115
problem function-size /src/feature/hs/hs_cell.c:hs_cell_parse_introduce2() 152
problem function-size /src/feature/hs/hs_client.c:send_introduce1() 103
problem function-size /src/feature/hs/hs_client.c:hs_config_client_authorization() 107
problem function-size /src/feature/hs/hs_common.c:hs_get_responsible_hsdirs() 102
problem function-size /src/feature/hs/hs_config.c:config_service_v3() 107
problem function-size /src/feature/hs/hs_config.c:config_generic_service() 138
problem function-size /src/feature/hs/hs_descriptor.c:desc_encode_v3() 101
problem function-size /src/feature/hs/hs_descriptor.c:decrypt_desc_layer() 105
problem function-size /src/feature/hs/hs_descriptor.c:decode_introduction_point() 122
problem function-size /src/feature/hs/hs_descriptor.c:desc_decode_superencrypted_v3() 107
problem function-size /src/feature/hs/hs_descriptor.c:desc_decode_encrypted_v3() 107
problem file-size /src/feature/hs/hs_service.c 4109
problem file-size /src/feature/hs/hs_service.c 4116
problem function-size /src/feature/keymgt/loadkey.c:ed_key_init_from_file() 326
problem function-size /src/feature/nodelist/authcert.c:trusted_dirs_load_certs_from_string() 123
problem function-size /src/feature/nodelist/authcert.c:authority_certs_fetch_missing() 295
@ -261,7 +261,7 @@ problem function-size /src/feature/nodelist/node_select.c:router_pick_directory_
problem function-size /src/feature/nodelist/node_select.c:compute_weighted_bandwidths() 203
problem function-size /src/feature/nodelist/node_select.c:router_pick_trusteddirserver_impl() 112
problem function-size /src/feature/nodelist/nodelist.c:compute_frac_paths_available() 190
problem file-size /src/feature/nodelist/routerlist.c 3239
problem file-size /src/feature/nodelist/routerlist.c 3241
problem function-size /src/feature/nodelist/routerlist.c:router_rebuild_store() 148
problem function-size /src/feature/nodelist/routerlist.c:router_add_to_routerlist() 168
problem function-size /src/feature/nodelist/routerlist.c:routerlist_remove_old_routers() 121
@ -280,7 +280,7 @@ problem function-size /src/feature/relay/routerkeys.c:load_ed_keys() 294
problem function-size /src/feature/rend/rendcache.c:rend_cache_store_v2_desc_as_client() 190
problem function-size /src/feature/rend/rendclient.c:rend_client_send_introduction() 219
problem function-size /src/feature/rend/rendcommon.c:rend_encode_v2_descriptors() 221
problem function-size /src/feature/rend/rendmid.c:rend_mid_establish_intro_legacy() 103
problem function-size /src/feature/rend/rendmid.c:rend_mid_establish_intro_legacy() 104
problem function-size /src/feature/rend/rendparse.c:rend_parse_v2_service_descriptor() 181
problem function-size /src/feature/rend/rendparse.c:rend_parse_introduction_points() 129
problem file-size /src/feature/rend/rendservice.c 4511

5
src/app/config/config.c
View File

@ -496,6 +496,11 @@ static const config_var_t option_vars_[] = {
VAR("HiddenServiceMaxStreamsCloseCircuit",LINELIST_S, RendConfigLines, NULL),
VAR("HiddenServiceNumIntroductionPoints", LINELIST_S, RendConfigLines, NULL),
VAR("HiddenServiceExportCircuitID", LINELIST_S, RendConfigLines, NULL),
VAR("HiddenServiceEnableIntroDoSDefense", LINELIST_S, RendConfigLines, NULL),
VAR("HiddenServiceEnableIntroDoSRatePerSec",
LINELIST_S, RendConfigLines, NULL),
VAR("HiddenServiceEnableIntroDoSBurstPerSec",
LINELIST_S, RendConfigLines, NULL),
VAR("HiddenServiceStatistics", BOOL, HiddenServiceStatistics_option, "1"),
V(HidServAuth, LINELIST, NULL),
V(ClientOnionAuthDir, FILENAME, NULL),

4
src/core/or/or.h
View File

@ -843,6 +843,10 @@ typedef struct protover_summary_flags_t {
/** True iff this router has a protocol list that allows clients to
* negotiate hs circuit setup padding. Requires Padding>=2. */
unsigned int supports_hs_setup_padding : 1;
/** True iff this router has a protocol list that allows it to support the
* ESTABLISH_INTRO DoS cell extension. Requires HSIntro>=5. */
unsigned int supports_establish_intro_dos_extension : 1;
} protover_summary_flags_t;
typedef struct routerinfo_t routerinfo_t;

4
src/core/or/or_circuit_st.h
View File

@ -72,6 +72,10 @@ struct or_circuit_t {
* buffer stats to disk. */
uint64_t total_cell_waiting_time;
/** If set, the DoS defenses are enabled on this circuit meaning that the
* introduce2_bucket is initialized and used. */
unsigned int introduce2_dos_defense_enabled : 1;
/** INTRODUCE2 cell bucket controlling how much can go on this circuit. Only
* used if this is a service introduction circuit at the intro point
* (purpose = CIRCUIT_PURPOSE_INTRO_POINT). */

2
src/core/or/protover.c
View File

@ -392,7 +392,7 @@ protover_get_supported_protocols(void)
"Desc=1-2 "
"DirCache=1-2 "
"HSDir=1-2 "
"HSIntro=3-4 "
"HSIntro=3-5 "
"HSRend=1-2 "
"Link=1-5 "
#ifdef HAVE_WORKING_TOR_TLS_GET_TLSSECRETS

4
src/core/or/versions.c
View File

@ -450,7 +450,9 @@ memoize_protover_summary(protover_summary_flags_t *out,
PROTOVER_HS_RENDEZVOUS_POINT_V3);
out->supports_hs_setup_padding =
protocol_list_supports_protocol(protocols, PRT_PADDING,
PROTOVER_HS_SETUP_PADDING);
PROTOVER_HS_SETUP_PADDING);
out->supports_establish_intro_dos_extension =
protocol_list_supports_protocol(protocols, PRT_HSINTRO, 5);
protover_summary_flags_t *new_cached = tor_memdup(out, sizeof(*out));
cached = strmap_set(protover_summary_map, protocols, new_cached);

111
src/feature/hs/hs_cell.c
View File

@ -473,10 +473,110 @@ introduce1_set_legacy_id(trn_cell_introduce1_t *cell,
}
}
/* Build and add to the given DoS cell extension the given parameter type and
* value. */
static void
build_establish_intro_dos_param(trn_cell_extension_dos_t *dos_ext,
uint8_t param_type, uint64_t param_value)
{
trn_cell_extension_dos_param_t *dos_param =
trn_cell_extension_dos_param_new();
/* Extra safety. We should never send an unknown parameter type. */
tor_assert(param_type == TRUNNEL_DOS_PARAM_TYPE_INTRO2_RATE_PER_SEC ||
param_type == TRUNNEL_DOS_PARAM_TYPE_INTRO2_BURST_PER_SEC);
trn_cell_extension_dos_param_set_type(dos_param, param_type);
trn_cell_extension_dos_param_set_value(dos_param, param_value);
trn_cell_extension_dos_add_params(dos_ext, dos_param);
/* Not freeing the trunnel object because it is now owned by dos_ext. */
}
/* Build the DoS defense cell extension and put it in the given extensions
* object. This can't fail. */
static void
build_establish_intro_dos_extension(const hs_service_config_t *service_config,
trn_cell_extension_t *extensions)
{
ssize_t ret, dos_ext_encoded_len;
uint8_t *field_array;
trn_cell_extension_field_t *field;
trn_cell_extension_dos_t *dos_ext;
tor_assert(service_config);
tor_assert(extensions);
/* We are creating a cell extension field of the type DoS. */
field = trn_cell_extension_field_new();
trn_cell_extension_field_set_field_type(field,
TRUNNEL_CELL_EXTENSION_TYPE_DOS);
/* Build DoS extension field. We will put in two parameters. */
dos_ext = trn_cell_extension_dos_new();
trn_cell_extension_dos_set_n_params(dos_ext, 2);
/* Build DoS parameter INTRO2 rate per second. */
build_establish_intro_dos_param(dos_ext,
TRUNNEL_DOS_PARAM_TYPE_INTRO2_RATE_PER_SEC,
service_config->intro_dos_rate_per_sec);
/* Build DoS parameter INTRO2 burst per second. */
build_establish_intro_dos_param(dos_ext,
TRUNNEL_DOS_PARAM_TYPE_INTRO2_BURST_PER_SEC,
service_config->intro_dos_burst_per_sec);
/* Set the field with the encoded DoS extension. */
dos_ext_encoded_len = trn_cell_extension_dos_encoded_len(dos_ext);
/* Set length field and the field array size length. */
trn_cell_extension_field_set_field_len(field, dos_ext_encoded_len);
trn_cell_extension_field_setlen_field(field, dos_ext_encoded_len);
/* Encode the DoS extension into the cell extension field. */
field_array = trn_cell_extension_field_getarray_field(field);
ret = trn_cell_extension_dos_encode(field_array,
trn_cell_extension_field_getlen_field(field), dos_ext);
tor_assert(ret == dos_ext_encoded_len);
/* Finally, encode field into the cell extension. */
trn_cell_extension_add_fields(extensions, field);
/* We've just add an extension field to the cell extensions so increment the
* total number. */
trn_cell_extension_set_num(extensions,
trn_cell_extension_get_num(extensions) + 1);
/* Cleanup. DoS extension has been encoded at this point. */
trn_cell_extension_dos_free(dos_ext);
}
/* ========== */
/* Public API */
/* ========== */
/* Allocate and build all the ESTABLISH_INTRO cell extension. The given
* extensions pointer is always set to a valid cell extension object. */
STATIC trn_cell_extension_t *
build_establish_intro_extensions(const hs_service_config_t *service_config,
const hs_service_intro_point_t *ip)
{
trn_cell_extension_t *extensions;
tor_assert(service_config);
tor_assert(ip);
extensions = trn_cell_extension_new();
trn_cell_extension_set_num(extensions, 0);
/* If the defense has been enabled service side (by the operator with a
* torrc option) and the intro point does support it. */
if (service_config->has_dos_defense_enabled &&
ip->support_intro2_dos_defense) {
/* This function takes care to increment the number of extensions. */
build_establish_intro_dos_extension(service_config, extensions);
}
return extensions;
}
/* Build an ESTABLISH_INTRO cell with the given circuit nonce and intro point
* object. The encoded cell is put in cell_out that MUST at least be of the
* size of RELAY_PAYLOAD_SIZE. Return the encoded cell length on success else
@ -484,15 +584,17 @@ introduce1_set_legacy_id(trn_cell_introduce1_t *cell,
* legacy cell creation. */
ssize_t
hs_cell_build_establish_intro(const char *circ_nonce,
const hs_service_config_t *service_config,
const hs_service_intro_point_t *ip,
uint8_t *cell_out)
{
ssize_t cell_len = -1;
uint16_t sig_len = ED25519_SIG_LEN;
trn_cell_extension_t *ext;
trn_cell_establish_intro_t *cell = NULL;
trn_cell_extension_t *extensions;
tor_assert(circ_nonce);
tor_assert(service_config);
tor_assert(ip);
/* Quickly handle the legacy IP. */
@ -505,11 +607,12 @@ hs_cell_build_establish_intro(const char *circ_nonce,
goto done;
}
/* Build the extensions, if any. */
extensions = build_establish_intro_extensions(service_config, ip);
/* Set extension data. None used here. */
ext = trn_cell_extension_new();
trn_cell_extension_set_num(ext, 0);
cell = trn_cell_establish_intro_new();
trn_cell_establish_intro_set_extensions(cell, ext);
trn_cell_establish_intro_set_extensions(cell, extensions);
/* Set signature size. Array is then allocated in the cell. We need to do
* this early so we can use trunnel API to get the signature length. */
trn_cell_establish_intro_set_sig_len(cell, sig_len);

11
src/feature/hs/hs_cell.h
View File

@ -79,6 +79,7 @@ typedef struct hs_cell_introduce2_data_t {
/* Build cell API. */
ssize_t hs_cell_build_establish_intro(const char *circ_nonce,
const hs_service_config_t *config,
const hs_service_intro_point_t *ip,
uint8_t *cell_out);
ssize_t hs_cell_build_rendezvous1(const uint8_t *rendezvous_cookie,
@ -105,5 +106,15 @@ int hs_cell_parse_rendezvous2(const uint8_t *payload, size_t payload_len,
/* Util API. */
void hs_cell_introduce1_data_clear(hs_cell_introduce1_data_t *data);
#ifdef TOR_UNIT_TESTS
#include "trunnel/hs/cell_common.h"
STATIC trn_cell_extension_t *
build_establish_intro_extensions(const hs_service_config_t *service_config,
const hs_service_intro_point_t *ip);
#endif /* defined(TOR_UNIT_TESTS) */
#endif /* !defined(TOR_HS_CELL_H) */

2
src/feature/hs/hs_circuit.c
View File

@ -317,7 +317,7 @@ send_establish_intro(const hs_service_t *service,
/* Encode establish intro cell. */
cell_len = hs_cell_build_establish_intro(circ->cpath->prev->rend_circ_nonce,
ip, payload);
&service->config, ip, payload);
if (cell_len < 0) {
log_warn(LD_REND, "Unable to encode ESTABLISH_INTRO cell for service %s "
"on circuit %u. Closing circuit.",

60
src/feature/hs/hs_config.c
View File

@ -218,6 +218,9 @@ config_has_invalid_options(const config_line_t *line_,
const char *opts_exclude_v2[] = {
"HiddenServiceExportCircuitID",
"HiddenServiceEnableIntroDoSDefense",
"HiddenServiceEnableIntroDoSRatePerSec",
"HiddenServiceEnableIntroDoSBurstPerSec",
NULL /* End marker. */
};
@ -276,6 +279,15 @@ config_validate_service(const hs_service_config_t *config)
goto invalid;
}
/* DoS validation values. */
if (config->has_dos_defense_enabled &&
(config->intro_dos_burst_per_sec < config->intro_dos_rate_per_sec)) {
log_warn(LD_CONFIG, "Hidden service DoS defenses burst (%" PRIu32 ") can "
"not be smaller than the rate value (%" PRIu32 ").",
config->intro_dos_burst_per_sec, config->intro_dos_rate_per_sec);
goto invalid;
}
/* Valid. */
return 0;
invalid:
@ -296,6 +308,8 @@ config_service_v3(const config_line_t *line_,
{
int have_num_ip = 0;
bool export_circuit_id = false; /* just to detect duplicate options */
bool dos_enabled = false, dos_rate_per_sec = false;
bool dos_burst_per_sec = false;
const char *dup_opt_seen = NULL;
const config_line_t *line;
@ -334,6 +348,52 @@ config_service_v3(const config_line_t *line_,
export_circuit_id = true;
continue;
}
if (!strcasecmp(line->key, "HiddenServiceEnableIntroDoSDefense")) {
config->has_dos_defense_enabled =
(unsigned int) helper_parse_uint64(line->key, line->value,
HS_CONFIG_V3_DOS_DEFENSE_DEFAULT,
1, &ok);
if (!ok || dos_enabled) {
if (dos_enabled) {
dup_opt_seen = line->key;
}
goto err;
}
dos_enabled = true;
continue;
}
if (!strcasecmp(line->key, "HiddenServiceEnableIntroDoSRatePerSec")) {
config->intro_dos_rate_per_sec =
(unsigned int) helper_parse_uint64(line->key, line->value,
HS_CONFIG_V3_DOS_DEFENSE_RATE_PER_SEC_MIN,
HS_CONFIG_V3_DOS_DEFENSE_RATE_PER_SEC_MAX, &ok);
if (!ok || dos_rate_per_sec) {
if (dos_rate_per_sec) {
dup_opt_seen = line->key;
}
goto err;
}
dos_rate_per_sec = true;
log_info(LD_REND, "Service INTRO2 DoS defenses rate set to: %" PRIu32,
config->intro_dos_rate_per_sec);
continue;
}
if (!strcasecmp(line->key, "HiddenServiceEnableIntroDoSBurstPerSec")) {
config->intro_dos_burst_per_sec =
(unsigned int) helper_parse_uint64(line->key, line->value,
HS_CONFIG_V3_DOS_DEFENSE_BURST_PER_SEC_MIN,
HS_CONFIG_V3_DOS_DEFENSE_BURST_PER_SEC_MAX, &ok);
if (!ok || dos_burst_per_sec) {
if (dos_burst_per_sec) {
dup_opt_seen = line->key;
}
goto err;
}
dos_burst_per_sec = true;
log_info(LD_REND, "Service INTRO2 DoS defenses burst set to: %" PRIu32,
config->intro_dos_burst_per_sec);
continue;
}
}
/* We do not load the key material for the service at this stage. This is

9
src/feature/hs/hs_config.h
View File

@ -15,6 +15,15 @@
#define HS_CONFIG_MAX_STREAMS_PER_RDV_CIRCUIT 65535
/* Maximum number of intro points per version 3 services. */
#define HS_CONFIG_V3_MAX_INTRO_POINTS 20
/* Default value for the introduction DoS defenses. The MIN/MAX are inclusive
* meaning they can be used as valid values. */
#define HS_CONFIG_V3_DOS_DEFENSE_DEFAULT 0
#define HS_CONFIG_V3_DOS_DEFENSE_RATE_PER_SEC_DEFAULT 25
#define HS_CONFIG_V3_DOS_DEFENSE_RATE_PER_SEC_MIN 0
#define HS_CONFIG_V3_DOS_DEFENSE_RATE_PER_SEC_MAX INT32_MAX
#define HS_CONFIG_V3_DOS_DEFENSE_BURST_PER_SEC_DEFAULT 200
#define HS_CONFIG_V3_DOS_DEFENSE_BURST_PER_SEC_MIN 0
#define HS_CONFIG_V3_DOS_DEFENSE_BURST_PER_SEC_MAX INT32_MAX
/* API */

66
src/feature/hs/hs_dos.c
View File

@ -45,24 +45,26 @@
* introduction DoS defense. Disabled by default. */
#define HS_DOS_INTRODUCE_ENABLED_DEFAULT 0
/* Consensus parameters. */
static uint32_t hs_dos_introduce_rate_per_sec =
/* Consensus parameters. The ESTABLISH_INTRO DoS cell extension have higher
* priority than these values. If no extension is sent, these are used only by
* the introduction point. */
static uint32_t consensus_param_introduce_rate_per_sec =
HS_DOS_INTRODUCE_DEFAULT_CELL_RATE_PER_SEC;
static uint32_t hs_dos_introduce_burst_per_sec =
static uint32_t consensus_param_introduce_burst_per_sec =
HS_DOS_INTRODUCE_DEFAULT_CELL_BURST_PER_SEC;
static uint32_t hs_dos_introduce_enabled =
static uint32_t consensus_param_introduce_defense_enabled =
HS_DOS_INTRODUCE_ENABLED_DEFAULT;
static uint32_t
get_param_intro_dos_enabled(const networkstatus_t *ns)
STATIC uint32_t
get_intro2_enable_consensus_param(const networkstatus_t *ns)
{
return networkstatus_get_param(ns, "HiddenServiceEnableIntroDoSDefense",
HS_DOS_INTRODUCE_ENABLED_DEFAULT, 0, 1);
}
/* Return the parameter for the introduction rate per sec. */
static uint32_t
get_param_rate_per_sec(const networkstatus_t *ns)
STATIC uint32_t
get_intro2_rate_consensus_param(const networkstatus_t *ns)
{
return networkstatus_get_param(ns, "HiddenServiceEnableIntroDoSRatePerSec",
HS_DOS_INTRODUCE_DEFAULT_CELL_RATE_PER_SEC,
@ -70,8 +72,8 @@ get_param_rate_per_sec(const networkstatus_t *ns)
}
/* Return the parameter for the introduction burst per sec. */
static uint32_t
get_param_burst_per_sec(const networkstatus_t *ns)
STATIC uint32_t
get_intro2_burst_consensus_param(const networkstatus_t *ns)
{
return networkstatus_get_param(ns, "HiddenServiceEnableIntroDoSBurstPerSec",
HS_DOS_INTRODUCE_DEFAULT_CELL_BURST_PER_SEC,
@ -88,10 +90,13 @@ update_intro_circuits(void)
smartlist_t *intro_circs = hs_circuitmap_get_all_intro_circ_relay_side();
SMARTLIST_FOREACH_BEGIN(intro_circs, circuit_t *, circ) {
/* Defenses might have been enabled or disabled. */
TO_OR_CIRCUIT(circ)->introduce2_dos_defense_enabled =
consensus_param_introduce_defense_enabled;
/* Adjust the rate/burst value that might have changed. */
token_bucket_ctr_adjust(&TO_OR_CIRCUIT(circ)->introduce2_bucket,
hs_dos_get_intro2_rate(),
hs_dos_get_intro2_burst());
consensus_param_introduce_rate_per_sec,
consensus_param_introduce_burst_per_sec);
} SMARTLIST_FOREACH_END(circ);
smartlist_free(intro_circs);
@ -101,9 +106,12 @@ update_intro_circuits(void)
static void
set_consensus_parameters(const networkstatus_t *ns)
{
hs_dos_introduce_rate_per_sec = get_param_rate_per_sec(ns);
hs_dos_introduce_burst_per_sec = get_param_burst_per_sec(ns);
hs_dos_introduce_enabled = get_param_intro_dos_enabled(ns);
consensus_param_introduce_rate_per_sec =
get_intro2_rate_consensus_param(ns);
consensus_param_introduce_burst_per_sec =
get_intro2_burst_consensus_param(ns);
consensus_param_introduce_defense_enabled =
get_intro2_enable_consensus_param(ns);
/* The above might have changed which means we need to go through all
* introduction circuits (relay side) and update the token buckets. */
@ -114,18 +122,20 @@ set_consensus_parameters(const networkstatus_t *ns)
* Public API.
*/
/* Return the INTRODUCE2 cell rate per second. */
uint32_t
hs_dos_get_intro2_rate(void)
/* Initialize the INTRODUCE2 token bucket for the DoS defenses using the
* consensus/default values. We might get a cell extension that changes those
* later but if we don't, the default or consensus parameters are used. */
void
hs_dos_setup_default_intro2_defenses(or_circuit_t *circ)
{
return hs_dos_introduce_rate_per_sec;
}
tor_assert(circ);
/* Return the INTRODUCE2 cell burst per second. */
uint32_t
hs_dos_get_intro2_burst(void)
{
return hs_dos_introduce_burst_per_sec;
circ->introduce2_dos_defense_enabled =
consensus_param_introduce_defense_enabled;
token_bucket_ctr_init(&circ->introduce2_bucket,
consensus_param_introduce_rate_per_sec,
consensus_param_introduce_burst_per_sec,
(uint32_t) approx_time());
}
/* Called when the consensus has changed. We might have new consensus
@ -149,8 +159,10 @@ hs_dos_can_send_intro2(or_circuit_t *s_intro_circ)
{
tor_assert(s_intro_circ);
/* Always allowed if the defense is disabled. */
if (!hs_dos_introduce_enabled) {
/* Allow to send the cell if the DoS defenses are disabled on the circuit.
* This can be set by the consensus, the ESTABLISH_INTRO cell extension or
* the hardcoded values in tor code. */
if (!s_intro_circ->introduce2_dos_defense_enabled) {
return true;
}

10
src/feature/hs/hs_dos.h
View File

@ -20,16 +20,18 @@ void hs_dos_init(void);
/* Consensus. */
void hs_dos_consensus_has_changed(const networkstatus_t *ns);
/* Introduction Point. */
bool hs_dos_can_send_intro2(or_circuit_t *s_intro_circ);
/* Getters. */
uint32_t hs_dos_get_intro2_rate(void);
uint32_t hs_dos_get_intro2_burst(void);
void hs_dos_setup_default_intro2_defenses(or_circuit_t *circ);
#ifdef HS_DOS_PRIVATE
#ifdef TOR_UNIT_TESTS
STATIC uint32_t get_intro2_enable_consensus_param(const networkstatus_t *ns);
STATIC uint32_t get_intro2_rate_consensus_param(const networkstatus_t *ns);
STATIC uint32_t get_intro2_burst_consensus_param(const networkstatus_t *ns);
#endif /* define(TOR_UNIT_TESTS) */
#endif /* defined(HS_DOS_PRIVATE) */

190
src/feature/hs/hs_intropoint.c
View File

@ -26,6 +26,7 @@
#include "feature/hs/hs_circuitmap.h"
#include "feature/hs/hs_common.h"
#include "feature/hs/hs_config.h"
#include "feature/hs/hs_descriptor.h"
#include "feature/hs/hs_dos.h"
#include "feature/hs/hs_intropoint.h"
@ -181,6 +182,185 @@ hs_intro_send_intro_established_cell,(or_circuit_t *circ))
return ret;
}
/* Validate the cell DoS extension parameters. Return true iff they've been
* bound check and can be used. Else return false. See proposal 305 for
* details and reasons about this validation. */
STATIC bool
cell_dos_extension_parameters_are_valid(uint64_t intro2_rate_per_sec,
uint64_t intro2_burst_per_sec)
{
bool ret = false;
/* Check that received value is not below the minimum. Don't check if minimum
is set to 0, since the param is a positive value and gcc will complain. */
#if HS_CONFIG_V3_DOS_DEFENSE_RATE_PER_SEC_MIN > 0
if (intro2_rate_per_sec < HS_CONFIG_V3_DOS_DEFENSE_RATE_PER_SEC_MIN) {
log_fn(LOG_PROTOCOL_WARN, LD_REND,
"Intro point DoS defenses rate per second is "
"too small. Received value: %" PRIu64, intro2_rate_per_sec);
goto end;
}
#endif
/* Check that received value is not above maximum */
if (intro2_rate_per_sec > HS_CONFIG_V3_DOS_DEFENSE_RATE_PER_SEC_MAX) {
log_fn(LOG_PROTOCOL_WARN, LD_REND,
"Intro point DoS defenses rate per second is "
"too big. Received value: %" PRIu64, intro2_rate_per_sec);
goto end;
}
/* Check that received value is not below the minimum */
#if HS_CONFIG_V3_DOS_DEFENSE_BURST_PER_SEC_MIN > 0
if (intro2_burst_per_sec < HS_CONFIG_V3_DOS_DEFENSE_BURST_PER_SEC_MIN) {
log_fn(LOG_PROTOCOL_WARN, LD_REND,
"Intro point DoS defenses burst per second is "
"too small. Received value: %" PRIu64, intro2_burst_per_sec);
goto end;
}
#endif
/* Check that received value is not above maximum */
if (intro2_burst_per_sec > HS_CONFIG_V3_DOS_DEFENSE_BURST_PER_SEC_MAX) {
log_fn(LOG_PROTOCOL_WARN, LD_REND,
"Intro point DoS defenses burst per second is "
"too big. Received value: %" PRIu64, intro2_burst_per_sec);
goto end;
}
/* In a rate limiting scenario, burst can never be smaller than the rate. At
* best it can be equal. */
if (intro2_burst_per_sec < intro2_rate_per_sec) {
log_info(LD_REND, "Intro point DoS defenses burst is smaller than rate. "
"Rate: %" PRIu64 " vs Burst: %" PRIu64,
intro2_rate_per_sec, intro2_burst_per_sec);
goto end;
}
/* Passing validation. */
ret = true;
end:
return ret;
}
/* Parse the cell DoS extension and apply defenses on the given circuit if
* validation passes. If the cell extension is malformed or contains unusable
* values, the DoS defenses is disabled on the circuit. */
static void
handle_establish_intro_cell_dos_extension(
const trn_cell_extension_field_t *field,
or_circuit_t *circ)
{
ssize_t ret;
uint64_t intro2_rate_per_sec = 0, intro2_burst_per_sec = 0;
trn_cell_extension_dos_t *dos = NULL;
tor_assert(field);
tor_assert(circ);
ret = trn_cell_extension_dos_parse(&dos,
trn_cell_extension_field_getconstarray_field(field),
trn_cell_extension_field_getlen_field(field));
if (ret < 0) {
goto end;
}
for (size_t i = 0; i < trn_cell_extension_dos_get_n_params(dos); i++) {
const trn_cell_extension_dos_param_t *param =
trn_cell_extension_dos_getconst_params(dos, i);
if (BUG(param == NULL)) {
goto end;
}
switch (trn_cell_extension_dos_param_get_type(param)) {
case TRUNNEL_DOS_PARAM_TYPE_INTRO2_RATE_PER_SEC:
intro2_rate_per_sec = trn_cell_extension_dos_param_get_value(param);
break;
case TRUNNEL_DOS_PARAM_TYPE_INTRO2_BURST_PER_SEC:
intro2_burst_per_sec = trn_cell_extension_dos_param_get_value(param);
break;
default:
goto end;
}
}
/* A value of 0 is valid in the sense that we accept it but we still disable
* the defenses so return false. */
if (intro2_rate_per_sec == 0 || intro2_burst_per_sec == 0) {
log_info(LD_REND, "Intro point DoS defenses parameter set to 0. "
"Disabling INTRO2 DoS defenses on circuit id %u",
circ->p_circ_id);
circ->introduce2_dos_defense_enabled = 0;
goto end;
}
/* If invalid, we disable the defense on the circuit. */
if (!cell_dos_extension_parameters_are_valid(intro2_rate_per_sec,
intro2_burst_per_sec)) {
circ->introduce2_dos_defense_enabled = 0;
log_info(LD_REND, "Disabling INTRO2 DoS defenses on circuit id %u",
circ->p_circ_id);
goto end;
}
/* We passed validation, enable defenses and apply rate/burst. */
circ->introduce2_dos_defense_enabled = 1;
/* Initialize the INTRODUCE2 token bucket for the rate limiting. */
token_bucket_ctr_init(&circ->introduce2_bucket,
(uint32_t) intro2_rate_per_sec,
(uint32_t) intro2_burst_per_sec,
(uint32_t) approx_time());
log_info(LD_REND, "Intro point DoS defenses enabled. Rate is %" PRIu64
" and Burst is %" PRIu64,
intro2_rate_per_sec, intro2_burst_per_sec);
end:
trn_cell_extension_dos_free(dos);
return;
}
/* Parse every cell extension in the given ESTABLISH_INTRO cell. */
static void
handle_establish_intro_cell_extensions(
const trn_cell_establish_intro_t *parsed_cell,
or_circuit_t *circ)
{
const trn_cell_extension_t *extensions;
tor_assert(parsed_cell);
tor_assert(circ);
extensions = trn_cell_establish_intro_getconst_extensions(parsed_cell);
if (extensions == NULL) {
goto end;
}
/* Go over all extensions. */
for (size_t idx = 0; idx < trn_cell_extension_get_num(extensions); idx++) {
const trn_cell_extension_field_t *field =
trn_cell_extension_getconst_fields(extensions, idx);
if (BUG(field == NULL)) {
/* The number of extensions should match the number of fields. */
break;
}
switch (trn_cell_extension_field_get_field_type(field)) {
case TRUNNEL_CELL_EXTENSION_TYPE_DOS:
/* After this, the circuit should be set for DoS defenses. */
handle_establish_intro_cell_dos_extension(field, circ);
break;
default:
/* Unknown extension. Skip over. */
break;
}
}
end:
return;
}
/** We received an ESTABLISH_INTRO <b>parsed_cell</b> on <b>circ</b>. It's
* well-formed and passed our verifications. Perform appropriate actions to
* establish an intro point. */
@ -193,6 +373,13 @@ handle_verified_establish_intro_cell(or_circuit_t *circ,
get_auth_key_from_cell(&auth_key, RELAY_COMMAND_ESTABLISH_INTRO,
parsed_cell);
/* Setup INTRODUCE2 defenses on the circuit. Must be done before parsing the
* cell extension that can possibly change the defenses' values. */
hs_dos_setup_default_intro2_defenses(circ);
/* Handle cell extension if any. */
handle_establish_intro_cell_extensions(parsed_cell, circ);
/* Then notify the hidden service that the intro point is established by
sending an INTRO_ESTABLISHED cell */
if (hs_intro_send_intro_established_cell(circ)) {
@ -204,9 +391,6 @@ handle_verified_establish_intro_cell(or_circuit_t *circ,
hs_circuitmap_register_intro_circ_v3_relay_side(circ, &auth_key);
/* Repurpose this circuit into an intro circuit. */
circuit_change_purpose(TO_CIRCUIT(circ), CIRCUIT_PURPOSE_INTRO_POINT);
/* Initialize the INTRODUCE2 token bucket for the rate limiting. */
token_bucket_ctr_init(&circ->introduce2_bucket, hs_dos_get_intro2_rate(),
hs_dos_get_intro2_burst(), (uint32_t) approx_time());
return 0;
}

3
src/feature/hs/hs_intropoint.h
View File

@ -57,6 +57,9 @@ STATIC int handle_introduce1(or_circuit_t *client_circ,
const uint8_t *request, size_t request_len);
STATIC int validate_introduce1_parsed_cell(const trn_cell_introduce1_t *cell);
STATIC int circuit_is_suitable_for_introduce1(const or_circuit_t *circ);
STATIC bool cell_dos_extension_parameters_are_valid(
uint64_t intro2_rate_per_sec,
uint64_t intro2_burst_per_sec);
#endif /* defined(HS_INTROPOINT_PRIVATE) */

7
src/feature/hs/hs_service.c
View File

@ -242,6 +242,9 @@ set_service_default_config(hs_service_config_t *c,
c->is_single_onion = 0;
c->dir_group_readable = 0;
c->is_ephemeral = 0;
c->has_dos_defense_enabled = HS_CONFIG_V3_DOS_DEFENSE_DEFAULT;
c->intro_dos_rate_per_sec = HS_CONFIG_V3_DOS_DEFENSE_RATE_PER_SEC_DEFAULT;
c->intro_dos_burst_per_sec = HS_CONFIG_V3_DOS_DEFENSE_BURST_PER_SEC_DEFAULT;
}
/* From a service configuration object config, clear everything from it
@ -489,6 +492,10 @@ service_intro_point_new(const node_t *node)
}
}
/* Flag if this intro point supports the INTRO2 dos defenses. */
ip->support_intro2_dos_defense =
node_supports_establish_intro_dos_extension(node);
/* Finally, copy onion key from the node. */
memcpy(&ip->onion_key, node_get_curve25519_onion_key(node),
sizeof(ip->onion_key));

9
src/feature/hs/hs_service.h
View File

@ -76,6 +76,10 @@ typedef struct hs_service_intro_point_t {
* circuit associated with this intro point has received. This is used to
* prevent replay attacks. */
replaycache_t *replay_cache;
/* Support the INTRO2 DoS defense. If set, the DoS extension described by
* proposal 305 is sent. */
unsigned int support_intro2_dos_defense : 1;
} hs_service_intro_point_t;
/* Object handling introduction points of a service. */
@ -241,6 +245,11 @@ typedef struct hs_service_config_t {
/* Does this service export the circuit ID of its clients? */
hs_circuit_id_protocol_t circuit_id_protocol;
/* DoS defenses. For the ESTABLISH_INTRO cell extension. */
unsigned int has_dos_defense_enabled : 1;
uint32_t intro_dos_rate_per_sec;
uint32_t intro_dos_burst_per_sec;
} hs_service_config_t;
/* Service state. */

13
src/feature/nodelist/nodelist.c
View File

@ -1106,7 +1106,7 @@ node_ed25519_id_matches(const node_t *node, const ed25519_public_key_t *id)
/** Dummy object that should be unreturnable. Used to ensure that
* node_get_protover_summary_flags() always returns non-NULL. */
static const protover_summary_flags_t zero_protover_flags = {
0,0,0,0,0,0,0,0
0,0,0,0,0,0,0,0,0
};
/** Return the protover_summary_flags for a given node. */
@ -1166,6 +1166,17 @@ node_supports_ed25519_hs_intro(const node_t *node)
return node_get_protover_summary_flags(node)->supports_ed25519_hs_intro;
}
/** Return true iff <b>node</b> supports the DoS ESTABLISH_INTRO cell
* extenstion. */
int
node_supports_establish_intro_dos_extension(const node_t *node)
{
tor_assert(node);
return node_get_protover_summary_flags(node)->
supports_establish_intro_dos_extension;
}
/** Return true iff <b>node</b> supports to be a rendezvous point for hidden
* service version 3 (HSRend=2). */
int

1
src/feature/nodelist/nodelist.h
View File

@ -76,6 +76,7 @@ int node_supports_ed25519_link_authentication(const node_t *node,
int node_supports_v3_hsdir(const node_t *node);
int node_supports_ed25519_hs_intro(const node_t *node);
int node_supports_v3_rendezvous_point(const node_t *node);
int node_supports_establish_intro_dos_extension(const node_t *node);
const uint8_t *node_get_rsa_id_digest(const node_t *node);
smartlist_t *node_get_link_specifier_smartlist(const node_t *node,
bool direct_conn);

3
src/feature/rend/rendmid.c
View File

@ -118,8 +118,7 @@ rend_mid_establish_intro_legacy(or_circuit_t *circ, const uint8_t *request,
/* Now, set up this circuit. */
circuit_change_purpose(TO_CIRCUIT(circ), CIRCUIT_PURPOSE_INTRO_POINT);
hs_circuitmap_register_intro_circ_v2_relay_side(circ, (uint8_t *)pk_digest);
token_bucket_ctr_init(&circ->introduce2_bucket, hs_dos_get_intro2_rate(),
hs_dos_get_intro2_burst(), (uint32_t) approx_time());
hs_dos_setup_default_intro2_defenses(circ);
log_info(LD_REND,
"Established introduction point on circuit %u for service %s",

96
src/test/test_hs_cell.c
View File

@ -20,6 +20,7 @@
#include "feature/hs/hs_service.h"
/* Trunnel. */
#include "trunnel/hs/cell_common.h"
#include "trunnel/hs/cell_establish_intro.h"
/** We simulate the creation of an outgoing ESTABLISH_INTRO cell, and then we
@ -38,11 +39,13 @@ test_gen_establish_intro_cell(void *arg)
/* Create outgoing ESTABLISH_INTRO cell and extract its payload so that we
attempt to parse it. */
{
hs_service_config_t config;
memset(&config, 0, sizeof(config));
/* We only need the auth key pair here. */
hs_service_intro_point_t *ip = service_intro_point_new(NULL);
/* Auth key pair is generated in the constructor so we are all set for
* using this IP object. */
ret = hs_cell_build_establish_intro(circ_nonce, ip, buf);
ret = hs_cell_build_establish_intro(circ_nonce, &config, ip, buf);
service_intro_point_free(ip);
tt_u64_op(ret, OP_GT, 0);
}
@ -97,6 +100,9 @@ test_gen_establish_intro_cell_bad(void *arg)
trn_cell_establish_intro_t *cell = NULL;
char circ_nonce[DIGEST_LEN] = {0};
hs_service_intro_point_t *ip = NULL;
hs_service_config_t config;
memset(&config, 0, sizeof(config));
MOCK(ed25519_sign_prefixed, mock_ed25519_sign_prefixed);
@ -108,7 +114,7 @@ test_gen_establish_intro_cell_bad(void *arg)
cell = trn_cell_establish_intro_new();
tt_assert(cell);
ip = service_intro_point_new(NULL);
cell_len = hs_cell_build_establish_intro(circ_nonce, ip, NULL);
cell_len = hs_cell_build_establish_intro(circ_nonce, &config, ip, NULL);
service_intro_point_free(ip);
expect_log_msg_containing("Unable to make signature for "
"ESTABLISH_INTRO cell.");
@ -120,11 +126,97 @@ test_gen_establish_intro_cell_bad(void *arg)
UNMOCK(ed25519_sign_prefixed);
}
static void
test_gen_establish_intro_dos_ext(void *arg)
{
ssize_t ret;
hs_service_config_t config;
hs_service_intro_point_t *ip = NULL;
trn_cell_extension_t *extensions = NULL;
trn_cell_extension_dos_t *dos = NULL;
(void) arg;
memset(&config, 0, sizeof(config));
ip = service_intro_point_new(NULL);
tt_assert(ip);
ip->support_intro2_dos_defense = 1;
/* Case 1: No DoS parameters so no extension to be built. */
extensions = build_establish_intro_extensions(&config, ip);
tt_int_op(trn_cell_extension_get_num(extensions), OP_EQ, 0);
trn_cell_extension_free(extensions);
extensions = NULL;
/* Case 2: Enable the DoS extension. Parameter set to 0 should indicate to
* disable the defense on the intro point but there should be an extension
* nonetheless in the cell. */
config.has_dos_defense_enabled = 1;
extensions = build_establish_intro_extensions(&config, ip);
tt_int_op(trn_cell_extension_get_num(extensions), OP_EQ, 1);
/* Validate the extension. */
const trn_cell_extension_field_t *field =
trn_cell_extension_getconst_fields(extensions, 0);
tt_int_op(trn_cell_extension_field_get_field_type(field), OP_EQ,
TRUNNEL_CELL_EXTENSION_TYPE_DOS);
ret = trn_cell_extension_dos_parse(&dos,
trn_cell_extension_field_getconstarray_field(field),
trn_cell_extension_field_getlen_field(field));
tt_int_op(ret, OP_EQ, 19);
/* Rate per sec param. */
const trn_cell_extension_dos_param_t *param =
trn_cell_extension_dos_getconst_params(dos, 0);
tt_int_op(trn_cell_extension_dos_param_get_type(param), OP_EQ,
TRUNNEL_DOS_PARAM_TYPE_INTRO2_RATE_PER_SEC);
tt_u64_op(trn_cell_extension_dos_param_get_value(param), OP_EQ, 0);
/* Burst per sec param. */
param = trn_cell_extension_dos_getconst_params(dos, 1);
tt_int_op(trn_cell_extension_dos_param_get_type(param), OP_EQ,
TRUNNEL_DOS_PARAM_TYPE_INTRO2_BURST_PER_SEC);
tt_u64_op(trn_cell_extension_dos_param_get_value(param), OP_EQ, 0);
trn_cell_extension_dos_free(dos); dos = NULL;
trn_cell_extension_free(extensions); extensions = NULL;
/* Case 3: Enable the DoS extension. Parameter set to some normal values. */
config.has_dos_defense_enabled = 1;
config.intro_dos_rate_per_sec = 42;
config.intro_dos_burst_per_sec = 250;
extensions = build_establish_intro_extensions(&config, ip);
tt_int_op(trn_cell_extension_get_num(extensions), OP_EQ, 1);
/* Validate the extension. */
field = trn_cell_extension_getconst_fields(extensions, 0);
tt_int_op(trn_cell_extension_field_get_field_type(field), OP_EQ,
TRUNNEL_CELL_EXTENSION_TYPE_DOS);
ret = trn_cell_extension_dos_parse(&dos,
trn_cell_extension_field_getconstarray_field(field),
trn_cell_extension_field_getlen_field(field));
tt_int_op(ret, OP_EQ, 19);
/* Rate per sec param. */
param = trn_cell_extension_dos_getconst_params(dos, 0);
tt_int_op(trn_cell_extension_dos_param_get_type(param), OP_EQ,
TRUNNEL_DOS_PARAM_TYPE_INTRO2_RATE_PER_SEC);
tt_u64_op(trn_cell_extension_dos_param_get_value(param), OP_EQ, 42);
/* Burst per sec param. */
param = trn_cell_extension_dos_getconst_params(dos, 1);
tt_int_op(trn_cell_extension_dos_param_get_type(param), OP_EQ,
TRUNNEL_DOS_PARAM_TYPE_INTRO2_BURST_PER_SEC);
tt_u64_op(trn_cell_extension_dos_param_get_value(param), OP_EQ, 250);
trn_cell_extension_dos_free(dos); dos = NULL;
trn_cell_extension_free(extensions); extensions = NULL;
done:
service_intro_point_free(ip);
trn_cell_extension_dos_free(dos);
trn_cell_extension_free(extensions);
}
struct testcase_t hs_cell_tests[] = {
{ "gen_establish_intro_cell", test_gen_establish_intro_cell, TT_FORK,
NULL, NULL },
{ "gen_establish_intro_cell_bad", test_gen_establish_intro_cell_bad, TT_FORK,
NULL, NULL },
{ "gen_establish_intro_dos_ext", test_gen_establish_intro_dos_ext, TT_FORK,
NULL, NULL },
END_OF_TESTCASES
};

109
src/test/test_hs_config.c
View File

@ -489,6 +489,111 @@ test_staging_service_v3(void *arg)
hs_free_all();
}
static void
test_dos_parameters(void *arg)
{
int ret;
(void) arg;
hs_init();
/* Valid configuration. */
{
const char *conf =
"HiddenServiceDir /tmp/tor-test-hs-RANDOM/hs3\n"
"HiddenServiceVersion 3\n"
"HiddenServicePort 22 1.1.1.1:22\n"
"HiddenServiceEnableIntroDoSDefense 1\n"
"HiddenServiceEnableIntroDoSRatePerSec 42\n"
"HiddenServiceEnableIntroDoSBurstPerSec 87\n";
setup_full_capture_of_logs(LOG_INFO);
ret = helper_config_service(conf, 0);
tt_int_op(ret, OP_EQ, 0);
expect_log_msg_containing("Service INTRO2 DoS defenses rate set to: 42");
expect_log_msg_containing("Service INTRO2 DoS defenses burst set to: 87");
teardown_capture_of_logs();
}
/* Invalid rate. Value of 2^37. Max allowed is 2^31. */
{
const char *conf =
"HiddenServiceDir /tmp/tor-test-hs-RANDOM/hs3\n"
"HiddenServiceVersion 3\n"
"HiddenServicePort 22 1.1.1.1:22\n"
"HiddenServiceEnableIntroDoSDefense 1\n"
"HiddenServiceEnableIntroDoSRatePerSec 137438953472\n"
"HiddenServiceEnableIntroDoSBurstPerSec 87\n";
setup_full_capture_of_logs(LOG_WARN);
ret = helper_config_service(conf, 0);
tt_int_op(ret, OP_EQ, -1);
expect_log_msg_containing("HiddenServiceEnableIntroDoSRatePerSec must "
"be between 0 and 2147483647, "
"not 137438953472");
teardown_capture_of_logs();
}
/* Invalid burst. Value of 2^38. Max allowed is 2^31. */
{
const char *conf =
"HiddenServiceDir /tmp/tor-test-hs-RANDOM/hs3\n"
"HiddenServiceVersion 3\n"
"HiddenServicePort 22 1.1.1.1:22\n"
"HiddenServiceEnableIntroDoSDefense 1\n"
"HiddenServiceEnableIntroDoSRatePerSec 42\n"
"HiddenServiceEnableIntroDoSBurstPerSec 274877906944\n";
setup_full_capture_of_logs(LOG_WARN);
ret = helper_config_service(conf, 0);
tt_int_op(ret, OP_EQ, -1);
expect_log_msg_containing("HiddenServiceEnableIntroDoSBurstPerSec must "
"be between 0 and 2147483647, "
"not 274877906944");
teardown_capture_of_logs();
}
/* Burst is smaller than rate. */
{
const char *conf =
"HiddenServiceDir /tmp/tor-test-hs-RANDOM/hs3\n"
"HiddenServiceVersion 3\n"
"HiddenServicePort 22 1.1.1.1:22\n"
"HiddenServiceEnableIntroDoSDefense 1\n"
"HiddenServiceEnableIntroDoSRatePerSec 42\n"
"HiddenServiceEnableIntroDoSBurstPerSec 27\n";
setup_full_capture_of_logs(LOG_WARN);
ret = helper_config_service(conf, 0);
tt_int_op(ret, OP_EQ, -1);
expect_log_msg_containing("Hidden service DoS defenses burst (27) can "
"not be smaller than the rate value (42).");
teardown_capture_of_logs();
}
/* Negative value. */
{
const char *conf =
"HiddenServiceDir /tmp/tor-test-hs-RANDOM/hs3\n"
"HiddenServiceVersion 3\n"
"HiddenServicePort 22 1.1.1.1:22\n"
"HiddenServiceEnableIntroDoSDefense 1\n"
"HiddenServiceEnableIntroDoSRatePerSec -1\n"
"HiddenServiceEnableIntroDoSBurstPerSec 42\n";
setup_full_capture_of_logs(LOG_WARN);
ret = helper_config_service(conf, 0);
tt_int_op(ret, OP_EQ, -1);
expect_log_msg_containing("HiddenServiceEnableIntroDoSRatePerSec must be "
"between 0 and 2147483647, not -1");
teardown_capture_of_logs();
}
done:
hs_free_all();
}
struct testcase_t hs_config_tests[] = {
/* Invalid service not specific to any version. */
{ "invalid_service", test_invalid_service, TT_FORK,
@ -512,6 +617,10 @@ struct testcase_t hs_config_tests[] = {
{ "staging_service_v3", test_staging_service_v3, TT_FORK,
NULL, NULL },
/* Test HS DoS parameters. */
{ "dos_parameters", test_dos_parameters, TT_FORK,
NULL, NULL },
END_OF_TESTCASES
};

62
src/test/test_hs_dos.c
View File

@ -8,6 +8,8 @@
#define CIRCUITLIST_PRIVATE
#define NETWORKSTATUS_PRIVATE
#define HS_DOS_PRIVATE
#define HS_INTROPOINT_PRIVATE
#include "test/test.h"
#include "test/test_helpers.h"
@ -20,6 +22,7 @@
#include "core/or/or_circuit_st.h"
#include "feature/hs/hs_dos.h"
#include "feature/hs/hs_intropoint.h"
#include "feature/nodelist/networkstatus.h"
static void
@ -57,9 +60,8 @@ test_can_send_intro2(void *arg)
/* Make that circuit a service intro point. */
circuit_change_purpose(TO_CIRCUIT(or_circ), CIRCUIT_PURPOSE_INTRO_POINT);
/* Initialize the INTRODUCE2 token bucket for the rate limiting. */
token_bucket_ctr_init(&or_circ->introduce2_bucket, hs_dos_get_intro2_rate(),
hs_dos_get_intro2_burst(), now);
hs_dos_setup_default_intro2_defenses(or_circ);
or_circ->introduce2_dos_defense_enabled = 1;
/* Brand new circuit, we should be able to send INTRODUCE2 cells. */
tt_int_op(true, OP_EQ, hs_dos_can_send_intro2(or_circ));
@ -71,13 +73,13 @@ test_can_send_intro2(void *arg)
tt_int_op(true, OP_EQ, hs_dos_can_send_intro2(or_circ));
}
tt_uint_op(token_bucket_ctr_get(&or_circ->introduce2_bucket), OP_EQ,
hs_dos_get_intro2_burst() - 10);
get_intro2_burst_consensus_param(NULL) - 10);
/* Fully refill the bucket minus 1 cell. */
update_approx_time(++now);
tt_int_op(true, OP_EQ, hs_dos_can_send_intro2(or_circ));
tt_uint_op(token_bucket_ctr_get(&or_circ->introduce2_bucket), OP_EQ,
hs_dos_get_intro2_burst() - 1);
get_intro2_burst_consensus_param(NULL) - 1);
/* Receive an INTRODUCE2 at each second. We should have the bucket full
* since at every second it gets refilled. */
@ -87,18 +89,18 @@ test_can_send_intro2(void *arg)
}
/* Last check if we can send the cell decrements the bucket so minus 1. */
tt_uint_op(token_bucket_ctr_get(&or_circ->introduce2_bucket), OP_EQ,
hs_dos_get_intro2_burst() - 1);
get_intro2_burst_consensus_param(NULL) - 1);
/* Manually reset bucket for next test. */
token_bucket_ctr_reset(&or_circ->introduce2_bucket, now);
tt_uint_op(token_bucket_ctr_get(&or_circ->introduce2_bucket), OP_EQ,
hs_dos_get_intro2_burst());
get_intro2_burst_consensus_param(NULL));
/* Do a full burst in the current second which should empty the bucket and
* we shouldn't be allowed to send one more cell after that. We go minus 1
* cell else the very last check if we can send the INTRO2 cell returns
* false because the bucket goes down to 0. */
for (uint32_t i = 0; i < hs_dos_get_intro2_burst() - 1; i++) {
for (uint32_t i = 0; i < get_intro2_burst_consensus_param(NULL) - 1; i++) {
tt_int_op(true, OP_EQ, hs_dos_can_send_intro2(or_circ));
}
tt_uint_op(token_bucket_ctr_get(&or_circ->introduce2_bucket), OP_EQ, 1);
@ -116,7 +118,7 @@ test_can_send_intro2(void *arg)
update_approx_time(++now);
tt_int_op(true, OP_EQ, hs_dos_can_send_intro2(or_circ));
tt_uint_op(token_bucket_ctr_get(&or_circ->introduce2_bucket), OP_EQ,
hs_dos_get_intro2_rate() - 1);
get_intro2_rate_consensus_param(NULL) - 1);
done:
circuit_free_(TO_CIRCUIT(or_circ));
@ -125,10 +127,50 @@ test_can_send_intro2(void *arg)
free_mock_consensus();
}
static void
test_validate_dos_extension_params(void *arg)
{
bool ret;
(void) arg;
/* Validate the default values. */
ret = cell_dos_extension_parameters_are_valid(
get_intro2_rate_consensus_param(NULL),
get_intro2_burst_consensus_param(NULL));
tt_assert(ret);
/* Valid custom rate/burst. */
ret = cell_dos_extension_parameters_are_valid(17, 42);
tt_assert(ret);
ret = cell_dos_extension_parameters_are_valid(INT32_MAX, INT32_MAX);
tt_assert(ret);
/* Invalid rate. */
ret = cell_dos_extension_parameters_are_valid(UINT64_MAX, 42);
tt_assert(!ret);
/* Invalid burst. */
ret = cell_dos_extension_parameters_are_valid(42, UINT64_MAX);
tt_assert(!ret);
/* Value of 0 is valid (but should disable defenses) */
ret = cell_dos_extension_parameters_are_valid(0, 0);
tt_assert(ret);
/* Can't have burst smaller than rate. */
ret = cell_dos_extension_parameters_are_valid(42, 40);
tt_assert(!ret);
done:
return;
}
struct testcase_t hs_dos_tests[] = {
{ "can_send_intro2", test_can_send_intro2, TT_FORK,
NULL, NULL },
{ "validate_dos_extension_params", test_validate_dos_extension_params,
TT_FORK, NULL, NULL },
END_OF_TESTCASES
};

161
src/test/test_hs_intropoint.c
View File

@ -26,6 +26,7 @@
#include "feature/hs/hs_cell.h"
#include "feature/hs/hs_circuitmap.h"
#include "feature/hs/hs_common.h"
#include "feature/hs/hs_config.h"
#include "feature/hs/hs_dos.h"
#include "feature/hs/hs_intropoint.h"
#include "feature/hs/hs_service.h"
@ -45,6 +46,9 @@ new_establish_intro_cell(const char *circ_nonce,
uint8_t buf[RELAY_PAYLOAD_SIZE] = {0};
trn_cell_establish_intro_t *cell = NULL;
hs_service_intro_point_t *ip = NULL;
hs_service_config_t config;
memset(&config, 0, sizeof(config));
/* Ensure that *cell_out is NULL such that we can use to check if we need to
* free `cell` in case of an error. */
@ -54,7 +58,7 @@ new_establish_intro_cell(const char *circ_nonce,
* using this IP object. */
ip = service_intro_point_new(NULL);
tt_assert(ip);
cell_len = hs_cell_build_establish_intro(circ_nonce, ip, buf);
cell_len = hs_cell_build_establish_intro(circ_nonce, &config, ip, buf);
tt_i64_op(cell_len, OP_GT, 0);
cell_len = trn_cell_establish_intro_parse(&cell, buf, sizeof(buf));
@ -75,12 +79,15 @@ new_establish_intro_encoded_cell(const char *circ_nonce, uint8_t *cell_out)
{
ssize_t cell_len = 0;
hs_service_intro_point_t *ip = NULL;
hs_service_config_t config;
memset(&config, 0, sizeof(config));
/* Auth key pair is generated in the constructor so we are all set for
* using this IP object. */
ip = service_intro_point_new(NULL);
tt_assert(ip);
cell_len = hs_cell_build_establish_intro(circ_nonce, ip, cell_out);
cell_len = hs_cell_build_establish_intro(circ_nonce, &config, ip, cell_out);
tt_i64_op(cell_len, OP_GT, 0);
done:
@ -903,6 +910,153 @@ test_received_introduce1_handling(void *arg)
UNMOCK(relay_send_command_from_edge_);
}
static void
test_received_establish_intro_dos_ext(void *arg)
{
int ret;
ssize_t cell_len = 0;
uint8_t cell[RELAY_PAYLOAD_SIZE] = {0};
char circ_nonce[DIGEST_LEN] = {0};
hs_service_intro_point_t *ip = NULL;
hs_service_config_t config;
or_circuit_t *intro_circ = or_circuit_new(0,NULL);
(void) arg;
MOCK(relay_send_command_from_edge_, mock_relay_send_command_from_edge);
hs_circuitmap_init();
/* Setup. */
crypto_rand(circ_nonce, sizeof(circ_nonce));
ip = service_intro_point_new(NULL);
tt_assert(ip);
ip->support_intro2_dos_defense = 1;
memset(&config, 0, sizeof(config));
config.has_dos_defense_enabled = 1;
config.intro_dos_rate_per_sec = 13;
config.intro_dos_burst_per_sec = 42;
helper_prepare_circ_for_intro(intro_circ, circ_nonce);
/* The INTRO2 bucket should be 0 at this point. */
tt_u64_op(token_bucket_ctr_get(&intro_circ->introduce2_bucket), OP_EQ, 0);
tt_u64_op(intro_circ->introduce2_bucket.cfg.rate, OP_EQ, 0);
tt_int_op(intro_circ->introduce2_bucket.cfg.burst, OP_EQ, 0);
tt_int_op(intro_circ->introduce2_dos_defense_enabled, OP_EQ, 0);
/* Case 1: Build encoded cell. Usable DoS parameters. */
cell_len = hs_cell_build_establish_intro(circ_nonce, &config, ip, cell);
tt_size_op(cell_len, OP_GT, 0);
/* Pass it to the intro point. */
ret = hs_intro_received_establish_intro(intro_circ, cell, cell_len);
tt_int_op(ret, OP_EQ, 0);
/* Should be set to the burst value. */
tt_u64_op(token_bucket_ctr_get(&intro_circ->introduce2_bucket), OP_EQ, 42);
/* Validate the config of the intro2 bucket. */
tt_u64_op(intro_circ->introduce2_bucket.cfg.rate, OP_EQ, 13);
tt_int_op(intro_circ->introduce2_bucket.cfg.burst, OP_EQ, 42);
tt_int_op(intro_circ->introduce2_dos_defense_enabled, OP_EQ, 1);
/* Need to reset the circuit in between test cases. */
circuit_free_(TO_CIRCUIT(intro_circ));
intro_circ = or_circuit_new(0,NULL);
helper_prepare_circ_for_intro(intro_circ, circ_nonce);
/* Case 2: Build encoded cell. Bad DoS parameters. */
config.has_dos_defense_enabled = 1;
config.intro_dos_rate_per_sec = UINT_MAX;
config.intro_dos_burst_per_sec = 13;
cell_len = hs_cell_build_establish_intro(circ_nonce, &config, ip, cell);
tt_size_op(cell_len, OP_GT, 0);
/* Pass it to the intro point. */
ret = hs_intro_received_establish_intro(intro_circ, cell, cell_len);
tt_int_op(ret, OP_EQ, 0);
tt_u64_op(token_bucket_ctr_get(&intro_circ->introduce2_bucket), OP_EQ,
HS_CONFIG_V3_DOS_DEFENSE_BURST_PER_SEC_DEFAULT);
tt_u64_op(intro_circ->introduce2_bucket.cfg.rate, OP_EQ,
HS_CONFIG_V3_DOS_DEFENSE_RATE_PER_SEC_DEFAULT);
tt_int_op(intro_circ->introduce2_bucket.cfg.burst, OP_EQ,
HS_CONFIG_V3_DOS_DEFENSE_BURST_PER_SEC_DEFAULT);
tt_int_op(intro_circ->introduce2_dos_defense_enabled, OP_EQ,
HS_CONFIG_V3_DOS_DEFENSE_DEFAULT);
/* Need to reset the circuit in between test cases. */
circuit_free_(TO_CIRCUIT(intro_circ));
intro_circ = or_circuit_new(0,NULL);
helper_prepare_circ_for_intro(intro_circ, circ_nonce);
/* Case 3: Build encoded cell. Burst is smaller than rate. Not allowed. */
config.has_dos_defense_enabled = 1;
config.intro_dos_rate_per_sec = 87;
config.intro_dos_burst_per_sec = 45;
cell_len = hs_cell_build_establish_intro(circ_nonce, &config, ip, cell);
tt_size_op(cell_len, OP_GT, 0);
/* Pass it to the intro point. */
ret = hs_intro_received_establish_intro(intro_circ, cell, cell_len);
tt_int_op(ret, OP_EQ, 0);
tt_u64_op(token_bucket_ctr_get(&intro_circ->introduce2_bucket), OP_EQ,
HS_CONFIG_V3_DOS_DEFENSE_BURST_PER_SEC_DEFAULT);
tt_u64_op(intro_circ->introduce2_bucket.cfg.rate, OP_EQ,
HS_CONFIG_V3_DOS_DEFENSE_RATE_PER_SEC_DEFAULT);
tt_int_op(intro_circ->introduce2_bucket.cfg.burst, OP_EQ,
HS_CONFIG_V3_DOS_DEFENSE_BURST_PER_SEC_DEFAULT);
tt_int_op(intro_circ->introduce2_dos_defense_enabled, OP_EQ,
HS_CONFIG_V3_DOS_DEFENSE_DEFAULT);
/* Need to reset the circuit in between test cases. */
circuit_free_(TO_CIRCUIT(intro_circ));
intro_circ = or_circuit_new(0,NULL);
helper_prepare_circ_for_intro(intro_circ, circ_nonce);
/* Case 4: Build encoded cell. Rate is 0 but burst is not 0. Disables the
* defense. */
config.has_dos_defense_enabled = 1;
config.intro_dos_rate_per_sec = 0;
config.intro_dos_burst_per_sec = 45;
cell_len = hs_cell_build_establish_intro(circ_nonce, &config, ip, cell);
tt_size_op(cell_len, OP_GT, 0);
/* Pass it to the intro point. */
ret = hs_intro_received_establish_intro(intro_circ, cell, cell_len);
tt_int_op(ret, OP_EQ, 0);
tt_u64_op(token_bucket_ctr_get(&intro_circ->introduce2_bucket), OP_EQ,
HS_CONFIG_V3_DOS_DEFENSE_BURST_PER_SEC_DEFAULT);
tt_u64_op(intro_circ->introduce2_bucket.cfg.rate, OP_EQ,
HS_CONFIG_V3_DOS_DEFENSE_RATE_PER_SEC_DEFAULT);
tt_int_op(intro_circ->introduce2_bucket.cfg.burst, OP_EQ,
HS_CONFIG_V3_DOS_DEFENSE_BURST_PER_SEC_DEFAULT);
tt_int_op(intro_circ->introduce2_dos_defense_enabled, OP_EQ,
HS_CONFIG_V3_DOS_DEFENSE_DEFAULT);
/* Need to reset the circuit in between test cases. */
circuit_free_(TO_CIRCUIT(intro_circ));
intro_circ = or_circuit_new(0,NULL);
helper_prepare_circ_for_intro(intro_circ, circ_nonce);
/* Case 5: Build encoded cell. Burst is 0 but rate is not 0. Disables the
* defense. */
config.has_dos_defense_enabled = 1;
config.intro_dos_rate_per_sec = 45;
config.intro_dos_burst_per_sec = 0;
cell_len = hs_cell_build_establish_intro(circ_nonce, &config, ip, cell);
tt_size_op(cell_len, OP_GT, 0);
/* Pass it to the intro point. */
ret = hs_intro_received_establish_intro(intro_circ, cell, cell_len);
tt_int_op(ret, OP_EQ, 0);
tt_u64_op(token_bucket_ctr_get(&intro_circ->introduce2_bucket), OP_EQ,
HS_CONFIG_V3_DOS_DEFENSE_BURST_PER_SEC_DEFAULT);
tt_u64_op(intro_circ->introduce2_bucket.cfg.rate, OP_EQ,
HS_CONFIG_V3_DOS_DEFENSE_RATE_PER_SEC_DEFAULT);
tt_int_op(intro_circ->introduce2_bucket.cfg.burst, OP_EQ,
HS_CONFIG_V3_DOS_DEFENSE_BURST_PER_SEC_DEFAULT);
tt_int_op(intro_circ->introduce2_dos_defense_enabled, OP_EQ,
HS_CONFIG_V3_DOS_DEFENSE_DEFAULT);
done:
circuit_free_(TO_CIRCUIT(intro_circ));
service_intro_point_free(ip);
hs_circuitmap_free_all();
UNMOCK(relay_send_command_from_edge_);
}
static void *
hs_subsystem_setup_fn(const struct testcase_t *tc)
{
@ -961,5 +1115,8 @@ struct testcase_t hs_intropoint_tests[] = {
{ "received_introduce1_handling",
test_received_introduce1_handling, TT_FORK, NULL, &test_setup},
{ "received_establish_intro_dos_ext",
test_received_establish_intro_dos_ext, TT_FORK, NULL, &test_setup},
END_OF_TESTCASES
};

116
src/trunnel/hs/cell_common.c
View File

@ -28,10 +28,10 @@ int cellcommon_deadcode_dummy__ = 0;
} \
} while (0)
trn_cell_extension_fields_t *
trn_cell_extension_fields_new(void)
trn_cell_extension_field_t *
trn_cell_extension_field_new(void)
{
trn_cell_extension_fields_t *val = trunnel_calloc(1, sizeof(trn_cell_extension_fields_t));
trn_cell_extension_field_t *val = trunnel_calloc(1, sizeof(trn_cell_extension_field_t));
if (NULL == val)
return NULL;
return val;
@ -40,7 +40,7 @@ trn_cell_extension_fields_new(void)
/** Release all storage held inside 'obj', but do not free 'obj'.
*/
static void
trn_cell_extension_fields_clear(trn_cell_extension_fields_t *obj)
trn_cell_extension_field_clear(trn_cell_extension_field_t *obj)
{
(void) obj;
TRUNNEL_DYNARRAY_WIPE(&obj->field);
@ -48,62 +48,62 @@ trn_cell_extension_fields_clear(trn_cell_extension_fields_t *obj)
}
void
trn_cell_extension_fields_free(trn_cell_extension_fields_t *obj)
trn_cell_extension_field_free(trn_cell_extension_field_t *obj)
{
if (obj == NULL)
return;
trn_cell_extension_fields_clear(obj);
trunnel_memwipe(obj, sizeof(trn_cell_extension_fields_t));
trn_cell_extension_field_clear(obj);
trunnel_memwipe(obj, sizeof(trn_cell_extension_field_t));
trunnel_free_(obj);
}
uint8_t
trn_cell_extension_fields_get_field_type(const trn_cell_extension_fields_t *inp)
trn_cell_extension_field_get_field_type(const trn_cell_extension_field_t *inp)
{
return inp->field_type;
}
int
trn_cell_extension_fields_set_field_type(trn_cell_extension_fields_t *inp, uint8_t val)
trn_cell_extension_field_set_field_type(trn_cell_extension_field_t *inp, uint8_t val)
{
inp->field_type = val;
return 0;
}
uint8_t
trn_cell_extension_fields_get_field_len(const trn_cell_extension_fields_t *inp)
trn_cell_extension_field_get_field_len(const trn_cell_extension_field_t *inp)
{
return inp->field_len;
}
int
trn_cell_extension_fields_set_field_len(trn_cell_extension_fields_t *inp, uint8_t val)
trn_cell_extension_field_set_field_len(trn_cell_extension_field_t *inp, uint8_t val)
{
inp->field_len = val;
return 0;
}
size_t
trn_cell_extension_fields_getlen_field(const trn_cell_extension_fields_t *inp)
trn_cell_extension_field_getlen_field(const trn_cell_extension_field_t *inp)
{
return TRUNNEL_DYNARRAY_LEN(&inp->field);
}
uint8_t
trn_cell_extension_fields_get_field(trn_cell_extension_fields_t *inp, size_t idx)
trn_cell_extension_field_get_field(trn_cell_extension_field_t *inp, size_t idx)
{
return TRUNNEL_DYNARRAY_GET(&inp->field, idx);
}
uint8_t
trn_cell_extension_fields_getconst_field(const trn_cell_extension_fields_t *inp, size_t idx)
trn_cell_extension_field_getconst_field(const trn_cell_extension_field_t *inp, size_t idx)
{
return trn_cell_extension_fields_get_field((trn_cell_extension_fields_t*)inp, idx);
return trn_cell_extension_field_get_field((trn_cell_extension_field_t*)inp, idx);
}
int
trn_cell_extension_fields_set_field(trn_cell_extension_fields_t *inp, size_t idx, uint8_t elt)
trn_cell_extension_field_set_field(trn_cell_extension_field_t *inp, size_t idx, uint8_t elt)
{
TRUNNEL_DYNARRAY_SET(&inp->field, idx, elt);
return 0;
}
int
trn_cell_extension_fields_add_field(trn_cell_extension_fields_t *inp, uint8_t elt)
trn_cell_extension_field_add_field(trn_cell_extension_field_t *inp, uint8_t elt)
{
#if SIZE_MAX >= UINT8_MAX
if (inp->field.n_ == UINT8_MAX)
@ -117,17 +117,17 @@ trn_cell_extension_fields_add_field(trn_cell_extension_fields_t *inp, uint8_t el
}
uint8_t *
trn_cell_extension_fields_getarray_field(trn_cell_extension_fields_t *inp)
trn_cell_extension_field_getarray_field(trn_cell_extension_field_t *inp)
{
return inp->field.elts_;
}
const uint8_t *
trn_cell_extension_fields_getconstarray_field(const trn_cell_extension_fields_t *inp)
trn_cell_extension_field_getconstarray_field(const trn_cell_extension_field_t *inp)
{
return (const uint8_t *)trn_cell_extension_fields_getarray_field((trn_cell_extension_fields_t*)inp);
return (const uint8_t *)trn_cell_extension_field_getarray_field((trn_cell_extension_field_t*)inp);
}
int
trn_cell_extension_fields_setlen_field(trn_cell_extension_fields_t *inp, size_t newlen)
trn_cell_extension_field_setlen_field(trn_cell_extension_field_t *inp, size_t newlen)
{
uint8_t *newptr;
#if UINT8_MAX < SIZE_MAX
@ -147,7 +147,7 @@ trn_cell_extension_fields_setlen_field(trn_cell_extension_fields_t *inp, size_t
return -1;
}
const char *
trn_cell_extension_fields_check(const trn_cell_extension_fields_t *obj)
trn_cell_extension_field_check(const trn_cell_extension_field_t *obj)
{
if (obj == NULL)
return "Object was NULL";
@ -159,11 +159,11 @@ trn_cell_extension_fields_check(const trn_cell_extension_fields_t *obj)
}
ssize_t
trn_cell_extension_fields_encoded_len(const trn_cell_extension_fields_t *obj)
trn_cell_extension_field_encoded_len(const trn_cell_extension_field_t *obj)
{
ssize_t result = 0;
if (NULL != trn_cell_extension_fields_check(obj))
if (NULL != trn_cell_extension_field_check(obj))
return -1;
@ -178,24 +178,24 @@ trn_cell_extension_fields_encoded_len(const trn_cell_extension_fields_t *obj)
return result;
}
int
trn_cell_extension_fields_clear_errors(trn_cell_extension_fields_t *obj)
trn_cell_extension_field_clear_errors(trn_cell_extension_field_t *obj)
{
int r = obj->trunnel_error_code_;
obj->trunnel_error_code_ = 0;
return r;
}
ssize_t
trn_cell_extension_fields_encode(uint8_t *output, const size_t avail, const trn_cell_extension_fields_t *obj)
trn_cell_extension_field_encode(uint8_t *output, const size_t avail, const trn_cell_extension_field_t *obj)
{
ssize_t result = 0;
size_t written = 0;
uint8_t *ptr = output;
const char *msg;
#ifdef TRUNNEL_CHECK_ENCODED_LEN
const ssize_t encoded_len = trn_cell_extension_fields_encoded_len(obj);
const ssize_t encoded_len = trn_cell_extension_field_encoded_len(obj);
#endif
if (NULL != (msg = trn_cell_extension_fields_check(obj)))
if (NULL != (msg = trn_cell_extension_field_check(obj)))
goto check_failed;
#ifdef TRUNNEL_CHECK_ENCODED_LEN
@ -252,11 +252,11 @@ trn_cell_extension_fields_encode(uint8_t *output, const size_t avail, const trn_
return result;
}
/** As trn_cell_extension_fields_parse(), but do not allocate the
/** As trn_cell_extension_field_parse(), but do not allocate the
* output object.
*/
static ssize_t
trn_cell_extension_fields_parse_into(trn_cell_extension_fields_t *obj, const uint8_t *input, const size_t len_in)
trn_cell_extension_field_parse_into(trn_cell_extension_field_t *obj, const uint8_t *input, const size_t len_in)
{
const uint8_t *ptr = input;
size_t remaining = len_in;
@ -290,15 +290,15 @@ trn_cell_extension_fields_parse_into(trn_cell_extension_fields_t *obj, const uin
}
ssize_t
trn_cell_extension_fields_parse(trn_cell_extension_fields_t **output, const uint8_t *input, const size_t len_in)
trn_cell_extension_field_parse(trn_cell_extension_field_t **output, const uint8_t *input, const size_t len_in)
{
ssize_t result;
*output = trn_cell_extension_fields_new();
*output = trn_cell_extension_field_new();
if (NULL == *output)
return -1;
result = trn_cell_extension_fields_parse_into(*output, input, len_in);
result = trn_cell_extension_field_parse_into(*output, input, len_in);
if (result < 0) {
trn_cell_extension_fields_free(*output);
trn_cell_extension_field_free(*output);
*output = NULL;
}
return result;
@ -322,7 +322,7 @@ trn_cell_extension_clear(trn_cell_extension_t *obj)
unsigned idx;
for (idx = 0; idx < TRUNNEL_DYNARRAY_LEN(&obj->fields); ++idx) {
trn_cell_extension_fields_free(TRUNNEL_DYNARRAY_GET(&obj->fields, idx));
trn_cell_extension_field_free(TRUNNEL_DYNARRAY_GET(&obj->fields, idx));
}
}
TRUNNEL_DYNARRAY_WIPE(&obj->fields);
@ -356,66 +356,66 @@ trn_cell_extension_getlen_fields(const trn_cell_extension_t *inp)
return TRUNNEL_DYNARRAY_LEN(&inp->fields);
}
struct trn_cell_extension_fields_st *
struct trn_cell_extension_field_st *
trn_cell_extension_get_fields(trn_cell_extension_t *inp, size_t idx)
{
return TRUNNEL_DYNARRAY_GET(&inp->fields, idx);
}
const struct trn_cell_extension_fields_st *
const struct trn_cell_extension_field_st *
trn_cell_extension_getconst_fields(const trn_cell_extension_t *inp, size_t idx)
{
return trn_cell_extension_get_fields((trn_cell_extension_t*)inp, idx);
}
int
trn_cell_extension_set_fields(trn_cell_extension_t *inp, size_t idx, struct trn_cell_extension_fields_st * elt)
trn_cell_extension_set_fields(trn_cell_extension_t *inp, size_t idx, struct trn_cell_extension_field_st * elt)
{
trn_cell_extension_fields_t *oldval = TRUNNEL_DYNARRAY_GET(&inp->fields, idx);
trn_cell_extension_field_t *oldval = TRUNNEL_DYNARRAY_GET(&inp->fields, idx);
if (oldval && oldval != elt)
trn_cell_extension_fields_free(oldval);
trn_cell_extension_field_free(oldval);
return trn_cell_extension_set0_fields(inp, idx, elt);
}
int
trn_cell_extension_set0_fields(trn_cell_extension_t *inp, size_t idx, struct trn_cell_extension_fields_st * elt)
trn_cell_extension_set0_fields(trn_cell_extension_t *inp, size_t idx, struct trn_cell_extension_field_st * elt)
{
TRUNNEL_DYNARRAY_SET(&inp->fields, idx, elt);
return 0;
}
int
trn_cell_extension_add_fields(trn_cell_extension_t *inp, struct trn_cell_extension_fields_st * elt)
trn_cell_extension_add_fields(trn_cell_extension_t *inp, struct trn_cell_extension_field_st * elt)
{
#if SIZE_MAX >= UINT8_MAX
if (inp->fields.n_ == UINT8_MAX)
goto trunnel_alloc_failed;
#endif
TRUNNEL_DYNARRAY_ADD(struct trn_cell_extension_fields_st *, &inp->fields, elt, {});
TRUNNEL_DYNARRAY_ADD(struct trn_cell_extension_field_st *, &inp->fields, elt, {});
return 0;
trunnel_alloc_failed:
TRUNNEL_SET_ERROR_CODE(inp);
return -1;
}
struct trn_cell_extension_fields_st * *
struct trn_cell_extension_field_st * *
trn_cell_extension_getarray_fields(trn_cell_extension_t *inp)
{
return inp->fields.elts_;
}
const struct trn_cell_extension_fields_st * const *
const struct trn_cell_extension_field_st * const *
trn_cell_extension_getconstarray_fields(const trn_cell_extension_t *inp)
{
return (const struct trn_cell_extension_fields_st * const *)trn_cell_extension_getarray_fields((trn_cell_extension_t*)inp);
return (const struct trn_cell_extension_field_st * const *)trn_cell_extension_getarray_fields((trn_cell_extension_t*)inp);
}
int
trn_cell_extension_setlen_fields(trn_cell_extension_t *inp, size_t newlen)
{
struct trn_cell_extension_fields_st * *newptr;
struct trn_cell_extension_field_st * *newptr;
#if UINT8_MAX < SIZE_MAX
if (newlen > UINT8_MAX)
goto trunnel_alloc_failed;
#endif
newptr = trunnel_dynarray_setlen(&inp->fields.allocated_,
&inp->fields.n_, inp->fields.elts_, newlen,
sizeof(inp->fields.elts_[0]), (trunnel_free_fn_t) trn_cell_extension_fields_free,
sizeof(inp->fields.elts_[0]), (trunnel_free_fn_t) trn_cell_extension_field_free,
&inp->trunnel_error_code_);
if (newlen != 0 && newptr == NULL)
goto trunnel_alloc_failed;
@ -437,7 +437,7 @@ trn_cell_extension_check(const trn_cell_extension_t *obj)
unsigned idx;
for (idx = 0; idx < TRUNNEL_DYNARRAY_LEN(&obj->fields); ++idx) {
if (NULL != (msg = trn_cell_extension_fields_check(TRUNNEL_DYNARRAY_GET(&obj->fields, idx))))
if (NULL != (msg = trn_cell_extension_field_check(TRUNNEL_DYNARRAY_GET(&obj->fields, idx))))
return msg;
}
}
@ -458,12 +458,12 @@ trn_cell_extension_encoded_len(const trn_cell_extension_t *obj)
/* Length of u8 num */
result += 1;
/* Length of struct trn_cell_extension_fields fields[num] */
/* Length of struct trn_cell_extension_field fields[num] */
{
unsigned idx;
for (idx = 0; idx < TRUNNEL_DYNARRAY_LEN(&obj->fields); ++idx) {
result += trn_cell_extension_fields_encoded_len(TRUNNEL_DYNARRAY_GET(&obj->fields, idx));
result += trn_cell_extension_field_encoded_len(TRUNNEL_DYNARRAY_GET(&obj->fields, idx));
}
}
return result;
@ -500,13 +500,13 @@ trn_cell_extension_encode(uint8_t *output, const size_t avail, const trn_cell_ex
trunnel_set_uint8(ptr, (obj->num));
written += 1; ptr += 1;
/* Encode struct trn_cell_extension_fields fields[num] */
/* Encode struct trn_cell_extension_field fields[num] */
{
unsigned idx;
for (idx = 0; idx < TRUNNEL_DYNARRAY_LEN(&obj->fields); ++idx) {
trunnel_assert(written <= avail);
result = trn_cell_extension_fields_encode(ptr, avail - written, TRUNNEL_DYNARRAY_GET(&obj->fields, idx));
result = trn_cell_extension_field_encode(ptr, avail - written, TRUNNEL_DYNARRAY_GET(&obj->fields, idx));
if (result < 0)
goto fail; /* XXXXXXX !*/
written += result; ptr += result;
@ -553,18 +553,18 @@ trn_cell_extension_parse_into(trn_cell_extension_t *obj, const uint8_t *input, c
obj->num = (trunnel_get_uint8(ptr));
remaining -= 1; ptr += 1;
/* Parse struct trn_cell_extension_fields fields[num] */
TRUNNEL_DYNARRAY_EXPAND(trn_cell_extension_fields_t *, &obj->fields, obj->num, {});
/* Parse struct trn_cell_extension_field fields[num] */
TRUNNEL_DYNARRAY_EXPAND(trn_cell_extension_field_t *, &obj->fields, obj->num, {});
{
trn_cell_extension_fields_t * elt;
trn_cell_extension_field_t * elt;
unsigned idx;
for (idx = 0; idx < obj->num; ++idx) {
result = trn_cell_extension_fields_parse(&elt, ptr, remaining);
result = trn_cell_extension_field_parse(&elt, ptr, remaining);
if (result < 0)
goto relay_fail;
trunnel_assert((size_t)result <= remaining);
remaining -= result; ptr += result;
TRUNNEL_DYNARRAY_ADD(trn_cell_extension_fields_t *, &obj->fields, elt, {trn_cell_extension_fields_free(elt);});
TRUNNEL_DYNARRAY_ADD(trn_cell_extension_field_t *, &obj->fields, elt, {trn_cell_extension_field_free(elt);});
}
}
trunnel_assert(ptr + remaining == input + len_in);

98
src/trunnel/hs/cell_common.h
View File

@ -8,112 +8,112 @@
#include <stdint.h>
#include "trunnel.h"
#if !defined(TRUNNEL_OPAQUE) && !defined(TRUNNEL_OPAQUE_TRN_CELL_EXTENSION_FIELDS)
struct trn_cell_extension_fields_st {
#if !defined(TRUNNEL_OPAQUE) && !defined(TRUNNEL_OPAQUE_TRN_CELL_EXTENSION_FIELD)
struct trn_cell_extension_field_st {
uint8_t field_type;
uint8_t field_len;
TRUNNEL_DYNARRAY_HEAD(, uint8_t) field;
uint8_t trunnel_error_code_;
};
#endif
typedef struct trn_cell_extension_fields_st trn_cell_extension_fields_t;
typedef struct trn_cell_extension_field_st trn_cell_extension_field_t;
#if !defined(TRUNNEL_OPAQUE) && !defined(TRUNNEL_OPAQUE_TRN_CELL_EXTENSION)
struct trn_cell_extension_st {
uint8_t num;
TRUNNEL_DYNARRAY_HEAD(, struct trn_cell_extension_fields_st *) fields;
TRUNNEL_DYNARRAY_HEAD(, struct trn_cell_extension_field_st *) fields;
uint8_t trunnel_error_code_;
};
#endif
typedef struct trn_cell_extension_st trn_cell_extension_t;
/** Return a newly allocated trn_cell_extension_fields with all
/** Return a newly allocated trn_cell_extension_field with all
* elements set to zero.
*/
trn_cell_extension_fields_t *trn_cell_extension_fields_new(void);
/** Release all storage held by the trn_cell_extension_fields in
trn_cell_extension_field_t *trn_cell_extension_field_new(void);
/** Release all storage held by the trn_cell_extension_field in
* 'victim'. (Do nothing if 'victim' is NULL.)
*/
void trn_cell_extension_fields_free(trn_cell_extension_fields_t *victim);
/** Try to parse a trn_cell_extension_fields from the buffer in
void trn_cell_extension_field_free(trn_cell_extension_field_t *victim);
/** Try to parse a trn_cell_extension_field from the buffer in
* 'input', using up to 'len_in' bytes from the input buffer. On
* success, return the number of bytes consumed and set *output to the
* newly allocated trn_cell_extension_fields_t. On failure, return -2
* newly allocated trn_cell_extension_field_t. On failure, return -2
* if the input appears truncated, and -1 if the input is otherwise
* invalid.
*/
ssize_t trn_cell_extension_fields_parse(trn_cell_extension_fields_t **output, const uint8_t *input, const size_t len_in);
ssize_t trn_cell_extension_field_parse(trn_cell_extension_field_t **output, const uint8_t *input, const size_t len_in);
/** Return the number of bytes we expect to need to encode the
* trn_cell_extension_fields in 'obj'. On failure, return a negative
* trn_cell_extension_field in 'obj'. On failure, return a negative
* value. Note that this value may be an overestimate, and can even be
* an underestimate for certain unencodeable objects.
*/
ssize_t trn_cell_extension_fields_encoded_len(const trn_cell_extension_fields_t *obj);
/** Try to encode the trn_cell_extension_fields from 'input' into the
ssize_t trn_cell_extension_field_encoded_len(const trn_cell_extension_field_t *obj);
/** Try to encode the trn_cell_extension_field from 'input' into the
* buffer at 'output', using up to 'avail' bytes of the output buffer.
* On success, return the number of bytes used. On failure, return -2
* if the buffer was not long enough, and -1 if the input was invalid.
*/
ssize_t trn_cell_extension_fields_encode(uint8_t *output, size_t avail, const trn_cell_extension_fields_t *input);
/** Check whether the internal state of the trn_cell_extension_fields
ssize_t trn_cell_extension_field_encode(uint8_t *output, size_t avail, const trn_cell_extension_field_t *input);
/** Check whether the internal state of the trn_cell_extension_field
* in 'obj' is consistent. Return NULL if it is, and a short message
* if it is not.
*/
const char *trn_cell_extension_fields_check(const trn_cell_extension_fields_t *obj);
const char *trn_cell_extension_field_check(const trn_cell_extension_field_t *obj);
/** Clear any errors that were set on the object 'obj' by its setter
* functions. Return true iff errors were cleared.
*/
int trn_cell_extension_fields_clear_errors(trn_cell_extension_fields_t *obj);
int trn_cell_extension_field_clear_errors(trn_cell_extension_field_t *obj);
/** Return the value of the field_type field of the
* trn_cell_extension_fields_t in 'inp'
* trn_cell_extension_field_t in 'inp'
*/
uint8_t trn_cell_extension_fields_get_field_type(const trn_cell_extension_fields_t *inp);
uint8_t trn_cell_extension_field_get_field_type(const trn_cell_extension_field_t *inp);
/** Set the value of the field_type field of the
* trn_cell_extension_fields_t in 'inp' to 'val'. Return 0 on success;
* trn_cell_extension_field_t in 'inp' to 'val'. Return 0 on success;
* return -1 and set the error code on 'inp' on failure.
*/
int trn_cell_extension_fields_set_field_type(trn_cell_extension_fields_t *inp, uint8_t val);
int trn_cell_extension_field_set_field_type(trn_cell_extension_field_t *inp, uint8_t val);
/** Return the value of the field_len field of the
* trn_cell_extension_fields_t in 'inp'
* trn_cell_extension_field_t in 'inp'
*/
uint8_t trn_cell_extension_fields_get_field_len(const trn_cell_extension_fields_t *inp);
uint8_t trn_cell_extension_field_get_field_len(const trn_cell_extension_field_t *inp);
/** Set the value of the field_len field of the
* trn_cell_extension_fields_t in 'inp' to 'val'. Return 0 on success;
* trn_cell_extension_field_t in 'inp' to 'val'. Return 0 on success;
* return -1 and set the error code on 'inp' on failure.
*/
int trn_cell_extension_fields_set_field_len(trn_cell_extension_fields_t *inp, uint8_t val);
int trn_cell_extension_field_set_field_len(trn_cell_extension_field_t *inp, uint8_t val);
/** Return the length of the dynamic array holding the field field of
* the trn_cell_extension_fields_t in 'inp'.
* the trn_cell_extension_field_t in 'inp'.
*/
size_t trn_cell_extension_fields_getlen_field(const trn_cell_extension_fields_t *inp);
size_t trn_cell_extension_field_getlen_field(const trn_cell_extension_field_t *inp);
/** Return the element at position 'idx' of the dynamic array field
* field of the trn_cell_extension_fields_t in 'inp'.
* field of the trn_cell_extension_field_t in 'inp'.
*/
uint8_t trn_cell_extension_fields_get_field(trn_cell_extension_fields_t *inp, size_t idx);
/** As trn_cell_extension_fields_get_field, but take and return a
* const pointer
uint8_t trn_cell_extension_field_get_field(trn_cell_extension_field_t *inp, size_t idx);
/** As trn_cell_extension_field_get_field, but take and return a const
* pointer
*/
uint8_t trn_cell_extension_fields_getconst_field(const trn_cell_extension_fields_t *inp, size_t idx);
uint8_t trn_cell_extension_field_getconst_field(const trn_cell_extension_field_t *inp, size_t idx);
/** Change the element at position 'idx' of the dynamic array field
* field of the trn_cell_extension_fields_t in 'inp', so that it will
* field of the trn_cell_extension_field_t in 'inp', so that it will
* hold the value 'elt'.
*/
int trn_cell_extension_fields_set_field(trn_cell_extension_fields_t *inp, size_t idx, uint8_t elt);
int trn_cell_extension_field_set_field(trn_cell_extension_field_t *inp, size_t idx, uint8_t elt);
/** Append a new element 'elt' to the dynamic array field field of the
* trn_cell_extension_fields_t in 'inp'.
* trn_cell_extension_field_t in 'inp'.
*/
int trn_cell_extension_fields_add_field(trn_cell_extension_fields_t *inp, uint8_t elt);
int trn_cell_extension_field_add_field(trn_cell_extension_field_t *inp, uint8_t elt);
/** Return a pointer to the variable-length array field field of
* 'inp'.
*/
uint8_t * trn_cell_extension_fields_getarray_field(trn_cell_extension_fields_t *inp);
/** As trn_cell_extension_fields_get_field, but take and return a
* const pointer
uint8_t * trn_cell_extension_field_getarray_field(trn_cell_extension_field_t *inp);
/** As trn_cell_extension_field_get_field, but take and return a const
* pointer
*/
const uint8_t * trn_cell_extension_fields_getconstarray_field(const trn_cell_extension_fields_t *inp);
const uint8_t * trn_cell_extension_field_getconstarray_field(const trn_cell_extension_field_t *inp);
/** Change the length of the variable-length array field field of
* 'inp' to 'newlen'.Fill extra elements with 0. Return 0 on success;
* return -1 and set the error code on 'inp' on failure.
*/
int trn_cell_extension_fields_setlen_field(trn_cell_extension_fields_t *inp, size_t newlen);
int trn_cell_extension_field_setlen_field(trn_cell_extension_field_t *inp, size_t newlen);
/** Return a newly allocated trn_cell_extension with all elements set
* to zero.
*/
@ -166,32 +166,32 @@ size_t trn_cell_extension_getlen_fields(const trn_cell_extension_t *inp);
/** Return the element at position 'idx' of the dynamic array field
* fields of the trn_cell_extension_t in 'inp'.
*/
struct trn_cell_extension_fields_st * trn_cell_extension_get_fields(trn_cell_extension_t *inp, size_t idx);
struct trn_cell_extension_field_st * trn_cell_extension_get_fields(trn_cell_extension_t *inp, size_t idx);
/** As trn_cell_extension_get_fields, but take and return a const
* pointer
*/
const struct trn_cell_extension_fields_st * trn_cell_extension_getconst_fields(const trn_cell_extension_t *inp, size_t idx);
const struct trn_cell_extension_field_st * trn_cell_extension_getconst_fields(const trn_cell_extension_t *inp, size_t idx);
/** Change the element at position 'idx' of the dynamic array field
* fields of the trn_cell_extension_t in 'inp', so that it will hold
* the value 'elt'. Free the previous value, if any.
*/
int trn_cell_extension_set_fields(trn_cell_extension_t *inp, size_t idx, struct trn_cell_extension_fields_st * elt);
int trn_cell_extension_set_fields(trn_cell_extension_t *inp, size_t idx, struct trn_cell_extension_field_st * elt);
/** As trn_cell_extension_set_fields, but does not free the previous
* value.
*/
int trn_cell_extension_set0_fields(trn_cell_extension_t *inp, size_t idx, struct trn_cell_extension_fields_st * elt);
int trn_cell_extension_set0_fields(trn_cell_extension_t *inp, size_t idx, struct trn_cell_extension_field_st * elt);
/** Append a new element 'elt' to the dynamic array field fields of
* the trn_cell_extension_t in 'inp'.
*/
int trn_cell_extension_add_fields(trn_cell_extension_t *inp, struct trn_cell_extension_fields_st * elt);
int trn_cell_extension_add_fields(trn_cell_extension_t *inp, struct trn_cell_extension_field_st * elt);
/** Return a pointer to the variable-length array field fields of
* 'inp'.
*/
struct trn_cell_extension_fields_st * * trn_cell_extension_getarray_fields(trn_cell_extension_t *inp);
struct trn_cell_extension_field_st * * trn_cell_extension_getarray_fields(trn_cell_extension_t *inp);
/** As trn_cell_extension_get_fields, but take and return a const
* pointer
*/
const struct trn_cell_extension_fields_st * const * trn_cell_extension_getconstarray_fields(const trn_cell_extension_t *inp);
const struct trn_cell_extension_field_st * const * trn_cell_extension_getconstarray_fields(const trn_cell_extension_t *inp);
/** Change the length of the variable-length array field fields of
* 'inp' to 'newlen'.Fill extra elements with NULL; free removed
* elements. Return 0 on success; return -1 and set the error code on

4
src/trunnel/hs/cell_common.trunnel
View File

@ -1,6 +1,6 @@
/* This file contains common data structure that cells use. */
struct trn_cell_extension_fields {
struct trn_cell_extension_field {
u8 field_type;
u8 field_len;
u8 field[field_len];
@ -8,5 +8,5 @@ struct trn_cell_extension_fields {
struct trn_cell_extension {
u8 num;
struct trn_cell_extension_fields fields[num];
struct trn_cell_extension_field fields[num];
};

469
src/trunnel/hs/cell_establish_intro.c
View File

@ -36,6 +36,185 @@ ssize_t trn_cell_extension_encoded_len(const trn_cell_extension_t *obj);
ssize_t trn_cell_extension_encode(uint8_t *output, size_t avail, const trn_cell_extension_t *input);
const char *trn_cell_extension_check(const trn_cell_extension_t *obj);
int trn_cell_extension_clear_errors(trn_cell_extension_t *obj);
trn_cell_extension_dos_param_t *
trn_cell_extension_dos_param_new(void)
{
trn_cell_extension_dos_param_t *val = trunnel_calloc(1, sizeof(trn_cell_extension_dos_param_t));
if (NULL == val)
return NULL;
return val;
}
/** Release all storage held inside 'obj', but do not free 'obj'.
*/
static void
trn_cell_extension_dos_param_clear(trn_cell_extension_dos_param_t *obj)
{
(void) obj;
}
void
trn_cell_extension_dos_param_free(trn_cell_extension_dos_param_t *obj)
{
if (obj == NULL)
return;
trn_cell_extension_dos_param_clear(obj);
trunnel_memwipe(obj, sizeof(trn_cell_extension_dos_param_t));
trunnel_free_(obj);
}
uint8_t
trn_cell_extension_dos_param_get_type(const trn_cell_extension_dos_param_t *inp)
{
return inp->type;
}
int
trn_cell_extension_dos_param_set_type(trn_cell_extension_dos_param_t *inp, uint8_t val)
{
inp->type = val;
return 0;
}
uint64_t
trn_cell_extension_dos_param_get_value(const trn_cell_extension_dos_param_t *inp)
{
return inp->value;
}
int
trn_cell_extension_dos_param_set_value(trn_cell_extension_dos_param_t *inp, uint64_t val)
{
inp->value = val;
return 0;
}
const char *
trn_cell_extension_dos_param_check(const trn_cell_extension_dos_param_t *obj)
{
if (obj == NULL)
return "Object was NULL";
if (obj->trunnel_error_code_)
return "A set function failed on this object";
return NULL;
}
ssize_t
trn_cell_extension_dos_param_encoded_len(const trn_cell_extension_dos_param_t *obj)
{
ssize_t result = 0;
if (NULL != trn_cell_extension_dos_param_check(obj))
return -1;
/* Length of u8 type */
result += 1;
/* Length of u64 value */
result += 8;
return result;
}
int
trn_cell_extension_dos_param_clear_errors(trn_cell_extension_dos_param_t *obj)
{
int r = obj->trunnel_error_code_;
obj->trunnel_error_code_ = 0;
return r;
}
ssize_t
trn_cell_extension_dos_param_encode(uint8_t *output, const size_t avail, const trn_cell_extension_dos_param_t *obj)
{
ssize_t result = 0;
size_t written = 0;
uint8_t *ptr = output;
const char *msg;
#ifdef TRUNNEL_CHECK_ENCODED_LEN
const ssize_t encoded_len = trn_cell_extension_dos_param_encoded_len(obj);
#endif
if (NULL != (msg = trn_cell_extension_dos_param_check(obj)))
goto check_failed;
#ifdef TRUNNEL_CHECK_ENCODED_LEN
trunnel_assert(encoded_len >= 0);
#endif
/* Encode u8 type */
trunnel_assert(written <= avail);
if (avail - written < 1)
goto truncated;
trunnel_set_uint8(ptr, (obj->type));
written += 1; ptr += 1;
/* Encode u64 value */
trunnel_assert(written <= avail);
if (avail - written < 8)
goto truncated;
trunnel_set_uint64(ptr, trunnel_htonll(obj->value));
written += 8; ptr += 8;
trunnel_assert(ptr == output + written);
#ifdef TRUNNEL_CHECK_ENCODED_LEN
{
trunnel_assert(encoded_len >= 0);
trunnel_assert((size_t)encoded_len == written);
}
#endif
return written;
truncated:
result = -2;
goto fail;
check_failed:
(void)msg;
result = -1;
goto fail;
fail:
trunnel_assert(result < 0);
return result;
}
/** As trn_cell_extension_dos_param_parse(), but do not allocate the
* output object.
*/
static ssize_t
trn_cell_extension_dos_param_parse_into(trn_cell_extension_dos_param_t *obj, const uint8_t *input, const size_t len_in)
{
const uint8_t *ptr = input;
size_t remaining = len_in;
ssize_t result = 0;
(void)result;
/* Parse u8 type */
CHECK_REMAINING(1, truncated);
obj->type = (trunnel_get_uint8(ptr));
remaining -= 1; ptr += 1;
/* Parse u64 value */
CHECK_REMAINING(8, truncated);
obj->value = trunnel_ntohll(trunnel_get_uint64(ptr));
remaining -= 8; ptr += 8;
trunnel_assert(ptr + remaining == input + len_in);
return len_in - remaining;
truncated:
return -2;
}
ssize_t
trn_cell_extension_dos_param_parse(trn_cell_extension_dos_param_t **output, const uint8_t *input, const size_t len_in)
{
ssize_t result;
*output = trn_cell_extension_dos_param_new();
if (NULL == *output)
return -1;
result = trn_cell_extension_dos_param_parse_into(*output, input, len_in);
if (result < 0) {
trn_cell_extension_dos_param_free(*output);
*output = NULL;
}
return result;
}
trn_cell_establish_intro_t *
trn_cell_establish_intro_new(void)
{
@ -561,6 +740,296 @@ trn_cell_establish_intro_parse(trn_cell_establish_intro_t **output, const uint8_
}
return result;
}
trn_cell_extension_dos_t *
trn_cell_extension_dos_new(void)
{
trn_cell_extension_dos_t *val = trunnel_calloc(1, sizeof(trn_cell_extension_dos_t));
if (NULL == val)
return NULL;
return val;
}
/** Release all storage held inside 'obj', but do not free 'obj'.
*/
static void
trn_cell_extension_dos_clear(trn_cell_extension_dos_t *obj)
{
(void) obj;
{
unsigned idx;
for (idx = 0; idx < TRUNNEL_DYNARRAY_LEN(&obj->params); ++idx) {
trn_cell_extension_dos_param_free(TRUNNEL_DYNARRAY_GET(&obj->params, idx));
}
}
TRUNNEL_DYNARRAY_WIPE(&obj->params);
TRUNNEL_DYNARRAY_CLEAR(&obj->params);
}
void
trn_cell_extension_dos_free(trn_cell_extension_dos_t *obj)
{
if (obj == NULL)
return;
trn_cell_extension_dos_clear(obj);
trunnel_memwipe(obj, sizeof(trn_cell_extension_dos_t));
trunnel_free_(obj);
}
uint8_t
trn_cell_extension_dos_get_n_params(const trn_cell_extension_dos_t *inp)
{
return inp->n_params;
}
int
trn_cell_extension_dos_set_n_params(trn_cell_extension_dos_t *inp, uint8_t val)
{
inp->n_params = val;
return 0;
}
size_t
trn_cell_extension_dos_getlen_params(const trn_cell_extension_dos_t *inp)
{
return TRUNNEL_DYNARRAY_LEN(&inp->params);
}
struct trn_cell_extension_dos_param_st *
trn_cell_extension_dos_get_params(trn_cell_extension_dos_t *inp, size_t idx)
{
return TRUNNEL_DYNARRAY_GET(&inp->params, idx);
}
const struct trn_cell_extension_dos_param_st *
trn_cell_extension_dos_getconst_params(const trn_cell_extension_dos_t *inp, size_t idx)
{
return trn_cell_extension_dos_get_params((trn_cell_extension_dos_t*)inp, idx);
}
int
trn_cell_extension_dos_set_params(trn_cell_extension_dos_t *inp, size_t idx, struct trn_cell_extension_dos_param_st * elt)
{
trn_cell_extension_dos_param_t *oldval = TRUNNEL_DYNARRAY_GET(&inp->params, idx);
if (oldval && oldval != elt)
trn_cell_extension_dos_param_free(oldval);
return trn_cell_extension_dos_set0_params(inp, idx, elt);
}
int
trn_cell_extension_dos_set0_params(trn_cell_extension_dos_t *inp, size_t idx, struct trn_cell_extension_dos_param_st * elt)
{
TRUNNEL_DYNARRAY_SET(&inp->params, idx, elt);
return 0;
}
int
trn_cell_extension_dos_add_params(trn_cell_extension_dos_t *inp, struct trn_cell_extension_dos_param_st * elt)
{
#if SIZE_MAX >= UINT8_MAX
if (inp->params.n_ == UINT8_MAX)
goto trunnel_alloc_failed;
#endif
TRUNNEL_DYNARRAY_ADD(struct trn_cell_extension_dos_param_st *, &inp->params, elt, {});
return 0;
trunnel_alloc_failed:
TRUNNEL_SET_ERROR_CODE(inp);
return -1;
}
struct trn_cell_extension_dos_param_st * *
trn_cell_extension_dos_getarray_params(trn_cell_extension_dos_t *inp)
{
return inp->params.elts_;
}
const struct trn_cell_extension_dos_param_st * const *
trn_cell_extension_dos_getconstarray_params(const trn_cell_extension_dos_t *inp)
{
return (const struct trn_cell_extension_dos_param_st * const *)trn_cell_extension_dos_getarray_params((trn_cell_extension_dos_t*)inp);
}
int
trn_cell_extension_dos_setlen_params(trn_cell_extension_dos_t *inp, size_t newlen)
{
struct trn_cell_extension_dos_param_st * *newptr;
#if UINT8_MAX < SIZE_MAX
if (newlen > UINT8_MAX)
goto trunnel_alloc_failed;
#endif
newptr = trunnel_dynarray_setlen(&inp->params.allocated_,
&inp->params.n_, inp->params.elts_, newlen,
sizeof(inp->params.elts_[0]), (trunnel_free_fn_t) trn_cell_extension_dos_param_free,
&inp->trunnel_error_code_);
if (newlen != 0 && newptr == NULL)
goto trunnel_alloc_failed;
inp->params.elts_ = newptr;
return 0;
trunnel_alloc_failed:
TRUNNEL_SET_ERROR_CODE(inp);
return -1;
}
const char *
trn_cell_extension_dos_check(const trn_cell_extension_dos_t *obj)
{
if (obj == NULL)
return "Object was NULL";
if (obj->trunnel_error_code_)
return "A set function failed on this object";
{
const char *msg;
unsigned idx;
for (idx = 0; idx < TRUNNEL_DYNARRAY_LEN(&obj->params); ++idx) {
if (NULL != (msg = trn_cell_extension_dos_param_check(TRUNNEL_DYNARRAY_GET(&obj->params, idx))))
return msg;
}
}
if (TRUNNEL_DYNARRAY_LEN(&obj->params) != obj->n_params)
return "Length mismatch for params";
return NULL;
}
ssize_t
trn_cell_extension_dos_encoded_len(const trn_cell_extension_dos_t *obj)
{
ssize_t result = 0;
if (NULL != trn_cell_extension_dos_check(obj))
return -1;
/* Length of u8 n_params */
result += 1;
/* Length of struct trn_cell_extension_dos_param params[n_params] */
{
unsigned idx;
for (idx = 0; idx < TRUNNEL_DYNARRAY_LEN(&obj->params); ++idx) {
result += trn_cell_extension_dos_param_encoded_len(TRUNNEL_DYNARRAY_GET(&obj->params, idx));
}
}
return result;
}
int
trn_cell_extension_dos_clear_errors(trn_cell_extension_dos_t *obj)
{
int r = obj->trunnel_error_code_;
obj->trunnel_error_code_ = 0;
return r;
}
ssize_t
trn_cell_extension_dos_encode(uint8_t *output, const size_t avail, const trn_cell_extension_dos_t *obj)
{
ssize_t result = 0;
size_t written = 0;
uint8_t *ptr = output;
const char *msg;
#ifdef TRUNNEL_CHECK_ENCODED_LEN
const ssize_t encoded_len = trn_cell_extension_dos_encoded_len(obj);
#endif
if (NULL != (msg = trn_cell_extension_dos_check(obj)))
goto check_failed;
#ifdef TRUNNEL_CHECK_ENCODED_LEN
trunnel_assert(encoded_len >= 0);
#endif
/* Encode u8 n_params */
trunnel_assert(written <= avail);
if (avail - written < 1)
goto truncated;
trunnel_set_uint8(ptr, (obj->n_params));
written += 1; ptr += 1;
/* Encode struct trn_cell_extension_dos_param params[n_params] */
{
unsigned idx;
for (idx = 0; idx < TRUNNEL_DYNARRAY_LEN(&obj->params); ++idx) {
trunnel_assert(written <= avail);
result = trn_cell_extension_dos_param_encode(ptr, avail - written, TRUNNEL_DYNARRAY_GET(&obj->params, idx));
if (result < 0)
goto fail; /* XXXXXXX !*/
written += result; ptr += result;
}
}
trunnel_assert(ptr == output + written);
#ifdef TRUNNEL_CHECK_ENCODED_LEN
{
trunnel_assert(encoded_len >= 0);
trunnel_assert((size_t)encoded_len == written);
}
#endif
return written;
truncated:
result = -2;
goto fail;
check_failed:
(void)msg;
result = -1;
goto fail;
fail:
trunnel_assert(result < 0);
return result;
}
/** As trn_cell_extension_dos_parse(), but do not allocate the output
* object.
*/
static ssize_t
trn_cell_extension_dos_parse_into(trn_cell_extension_dos_t *obj, const uint8_t *input, const size_t len_in)
{
const uint8_t *ptr = input;
size_t remaining = len_in;
ssize_t result = 0;
(void)result;
/* Parse u8 n_params */
CHECK_REMAINING(1, truncated);
obj->n_params = (trunnel_get_uint8(ptr));
remaining -= 1; ptr += 1;
/* Parse struct trn_cell_extension_dos_param params[n_params] */
TRUNNEL_DYNARRAY_EXPAND(trn_cell_extension_dos_param_t *, &obj->params, obj->n_params, {});
{
trn_cell_extension_dos_param_t * elt;
unsigned idx;
for (idx = 0; idx < obj->n_params; ++idx) {
result = trn_cell_extension_dos_param_parse(&elt, ptr, remaining);
if (result < 0)
goto relay_fail;
trunnel_assert((size_t)result <= remaining);
remaining -= result; ptr += result;
TRUNNEL_DYNARRAY_ADD(trn_cell_extension_dos_param_t *, &obj->params, elt, {trn_cell_extension_dos_param_free(elt);});
}
}
trunnel_assert(ptr + remaining == input + len_in);
return len_in - remaining;
truncated:
return -2;
relay_fail:
trunnel_assert(result < 0);
return result;
trunnel_alloc_failed:
return -1;
}
ssize_t
trn_cell_extension_dos_parse(trn_cell_extension_dos_t **output, const uint8_t *input, const size_t len_in)
{
ssize_t result;
*output = trn_cell_extension_dos_new();
if (NULL == *output)
return -1;
result = trn_cell_extension_dos_parse_into(*output, input, len_in);
if (result < 0) {
trn_cell_extension_dos_free(*output);
*output = NULL;
}
return result;
}
trn_cell_intro_established_t *
trn_cell_intro_established_new(void)
{

159
src/trunnel/hs/cell_establish_intro.h
View File

@ -10,6 +10,17 @@
struct trn_cell_extension_st;
#define TRUNNEL_SHA3_256_LEN 32
#define TRUNNEL_CELL_EXTENSION_TYPE_DOS 1
#define TRUNNEL_DOS_PARAM_TYPE_INTRO2_RATE_PER_SEC 1
#define TRUNNEL_DOS_PARAM_TYPE_INTRO2_BURST_PER_SEC 2
#if !defined(TRUNNEL_OPAQUE) && !defined(TRUNNEL_OPAQUE_TRN_CELL_EXTENSION_DOS_PARAM)
struct trn_cell_extension_dos_param_st {
uint8_t type;
uint64_t value;
uint8_t trunnel_error_code_;
};
#endif
typedef struct trn_cell_extension_dos_param_st trn_cell_extension_dos_param_t;
#if !defined(TRUNNEL_OPAQUE) && !defined(TRUNNEL_OPAQUE_TRN_CELL_ESTABLISH_INTRO)
struct trn_cell_establish_intro_st {
const uint8_t *start_cell;
@ -26,6 +37,14 @@ struct trn_cell_establish_intro_st {
};
#endif
typedef struct trn_cell_establish_intro_st trn_cell_establish_intro_t;
#if !defined(TRUNNEL_OPAQUE) && !defined(TRUNNEL_OPAQUE_TRN_CELL_EXTENSION_DOS)
struct trn_cell_extension_dos_st {
uint8_t n_params;
TRUNNEL_DYNARRAY_HEAD(, struct trn_cell_extension_dos_param_st *) params;
uint8_t trunnel_error_code_;
};
#endif
typedef struct trn_cell_extension_dos_st trn_cell_extension_dos_t;
#if !defined(TRUNNEL_OPAQUE) && !defined(TRUNNEL_OPAQUE_TRN_CELL_INTRO_ESTABLISHED)
struct trn_cell_intro_established_st {
struct trn_cell_extension_st *extensions;
@ -33,6 +52,62 @@ struct trn_cell_intro_established_st {
};
#endif
typedef struct trn_cell_intro_established_st trn_cell_intro_established_t;
/** Return a newly allocated trn_cell_extension_dos_param with all
* elements set to zero.
*/
trn_cell_extension_dos_param_t *trn_cell_extension_dos_param_new(void);
/** Release all storage held by the trn_cell_extension_dos_param in
* 'victim'. (Do nothing if 'victim' is NULL.)
*/
void trn_cell_extension_dos_param_free(trn_cell_extension_dos_param_t *victim);
/** Try to parse a trn_cell_extension_dos_param from the buffer in
* 'input', using up to 'len_in' bytes from the input buffer. On
* success, return the number of bytes consumed and set *output to the
* newly allocated trn_cell_extension_dos_param_t. On failure, return
* -2 if the input appears truncated, and -1 if the input is otherwise
* invalid.
*/
ssize_t trn_cell_extension_dos_param_parse(trn_cell_extension_dos_param_t **output, const uint8_t *input, const size_t len_in);
/** Return the number of bytes we expect to need to encode the
* trn_cell_extension_dos_param in 'obj'. On failure, return a
* negative value. Note that this value may be an overestimate, and
* can even be an underestimate for certain unencodeable objects.
*/
ssize_t trn_cell_extension_dos_param_encoded_len(const trn_cell_extension_dos_param_t *obj);
/** Try to encode the trn_cell_extension_dos_param from 'input' into
* the buffer at 'output', using up to 'avail' bytes of the output
* buffer. On success, return the number of bytes used. On failure,
* return -2 if the buffer was not long enough, and -1 if the input
* was invalid.
*/
ssize_t trn_cell_extension_dos_param_encode(uint8_t *output, size_t avail, const trn_cell_extension_dos_param_t *input);
/** Check whether the internal state of the
* trn_cell_extension_dos_param in 'obj' is consistent. Return NULL if
* it is, and a short message if it is not.
*/
const char *trn_cell_extension_dos_param_check(const trn_cell_extension_dos_param_t *obj);
/** Clear any errors that were set on the object 'obj' by its setter
* functions. Return true iff errors were cleared.
*/
int trn_cell_extension_dos_param_clear_errors(trn_cell_extension_dos_param_t *obj);
/** Return the value of the type field of the
* trn_cell_extension_dos_param_t in 'inp'
*/
uint8_t trn_cell_extension_dos_param_get_type(const trn_cell_extension_dos_param_t *inp);
/** Set the value of the type field of the
* trn_cell_extension_dos_param_t in 'inp' to 'val'. Return 0 on
* success; return -1 and set the error code on 'inp' on failure.
*/
int trn_cell_extension_dos_param_set_type(trn_cell_extension_dos_param_t *inp, uint8_t val);
/** Return the value of the value field of the
* trn_cell_extension_dos_param_t in 'inp'
*/
uint64_t trn_cell_extension_dos_param_get_value(const trn_cell_extension_dos_param_t *inp);
/** Set the value of the value field of the
* trn_cell_extension_dos_param_t in 'inp' to 'val'. Return 0 on
* success; return -1 and set the error code on 'inp' on failure.
*/
int trn_cell_extension_dos_param_set_value(trn_cell_extension_dos_param_t *inp, uint64_t val);
/** Return a newly allocated trn_cell_establish_intro with all
* elements set to zero.
*/
@ -216,6 +291,90 @@ const uint8_t * trn_cell_establish_intro_getconstarray_sig(const trn_cell_estab
* -1 and set the error code on 'inp' on failure.
*/
int trn_cell_establish_intro_setlen_sig(trn_cell_establish_intro_t *inp, size_t newlen);
/** Return a newly allocated trn_cell_extension_dos with all elements
* set to zero.
*/
trn_cell_extension_dos_t *trn_cell_extension_dos_new(void);
/** Release all storage held by the trn_cell_extension_dos in
* 'victim'. (Do nothing if 'victim' is NULL.)
*/
void trn_cell_extension_dos_free(trn_cell_extension_dos_t *victim);
/** Try to parse a trn_cell_extension_dos from the buffer in 'input',
* using up to 'len_in' bytes from the input buffer. On success,
* return the number of bytes consumed and set *output to the newly
* allocated trn_cell_extension_dos_t. On failure, return -2 if the
* input appears truncated, and -1 if the input is otherwise invalid.
*/
ssize_t trn_cell_extension_dos_parse(trn_cell_extension_dos_t **output, const uint8_t *input, const size_t len_in);
/** Return the number of bytes we expect to need to encode the
* trn_cell_extension_dos in 'obj'. On failure, return a negative
* value. Note that this value may be an overestimate, and can even be
* an underestimate for certain unencodeable objects.
*/
ssize_t trn_cell_extension_dos_encoded_len(const trn_cell_extension_dos_t *obj);
/** Try to encode the trn_cell_extension_dos from 'input' into the
* buffer at 'output', using up to 'avail' bytes of the output buffer.
* On success, return the number of bytes used. On failure, return -2
* if the buffer was not long enough, and -1 if the input was invalid.
*/
ssize_t trn_cell_extension_dos_encode(uint8_t *output, size_t avail, const trn_cell_extension_dos_t *input);
/** Check whether the internal state of the trn_cell_extension_dos in
* 'obj' is consistent. Return NULL if it is, and a short message if
* it is not.
*/
const char *trn_cell_extension_dos_check(const trn_cell_extension_dos_t *obj);
/** Clear any errors that were set on the object 'obj' by its setter
* functions. Return true iff errors were cleared.
*/
int trn_cell_extension_dos_clear_errors(trn_cell_extension_dos_t *obj);
/** Return the value of the n_params field of the
* trn_cell_extension_dos_t in 'inp'
*/
uint8_t trn_cell_extension_dos_get_n_params(const trn_cell_extension_dos_t *inp);
/** Set the value of the n_params field of the
* trn_cell_extension_dos_t in 'inp' to 'val'. Return 0 on success;
* return -1 and set the error code on 'inp' on failure.
*/
int trn_cell_extension_dos_set_n_params(trn_cell_extension_dos_t *inp, uint8_t val);
/** Return the length of the dynamic array holding the params field of
* the trn_cell_extension_dos_t in 'inp'.
*/
size_t trn_cell_extension_dos_getlen_params(const trn_cell_extension_dos_t *inp);
/** Return the element at position 'idx' of the dynamic array field
* params of the trn_cell_extension_dos_t in 'inp'.
*/
struct trn_cell_extension_dos_param_st * trn_cell_extension_dos_get_params(trn_cell_extension_dos_t *inp, size_t idx);
/** As trn_cell_extension_dos_get_params, but take and return a const
* pointer
*/
const struct trn_cell_extension_dos_param_st * trn_cell_extension_dos_getconst_params(const trn_cell_extension_dos_t *inp, size_t idx);
/** Change the element at position 'idx' of the dynamic array field
* params of the trn_cell_extension_dos_t in 'inp', so that it will
* hold the value 'elt'. Free the previous value, if any.
*/
int trn_cell_extension_dos_set_params(trn_cell_extension_dos_t *inp, size_t idx, struct trn_cell_extension_dos_param_st * elt);
/** As trn_cell_extension_dos_set_params, but does not free the
* previous value.
*/
int trn_cell_extension_dos_set0_params(trn_cell_extension_dos_t *inp, size_t idx, struct trn_cell_extension_dos_param_st * elt);
/** Append a new element 'elt' to the dynamic array field params of
* the trn_cell_extension_dos_t in 'inp'.
*/
int trn_cell_extension_dos_add_params(trn_cell_extension_dos_t *inp, struct trn_cell_extension_dos_param_st * elt);
/** Return a pointer to the variable-length array field params of
* 'inp'.
*/
struct trn_cell_extension_dos_param_st * * trn_cell_extension_dos_getarray_params(trn_cell_extension_dos_t *inp);
/** As trn_cell_extension_dos_get_params, but take and return a const
* pointer
*/
const struct trn_cell_extension_dos_param_st * const * trn_cell_extension_dos_getconstarray_params(const trn_cell_extension_dos_t *inp);
/** Change the length of the variable-length array field params of
* 'inp' to 'newlen'.Fill extra elements with NULL; free removed
* elements. Return 0 on success; return -1 and set the error code on
* 'inp' on failure.
*/
int trn_cell_extension_dos_setlen_params(trn_cell_extension_dos_t *inp, size_t newlen);
/** Return a newly allocated trn_cell_intro_established with all
* elements set to zero.
*/

23
src/trunnel/hs/cell_establish_intro.trunnel
View File

@ -39,3 +39,26 @@ struct trn_cell_intro_established {
/* Extension(s). Reserved fields. */
struct trn_cell_extension extensions;
};
/*
* ESTABLISH_INTRO cell extensions.
*/
const TRUNNEL_CELL_EXTENSION_TYPE_DOS = 0x01;
/* DoS Parameter types. */
const TRUNNEL_DOS_PARAM_TYPE_INTRO2_RATE_PER_SEC = 0x01;
const TRUNNEL_DOS_PARAM_TYPE_INTRO2_BURST_PER_SEC = 0x02;
/*
* DoS Parameters Extension. See proposal 305 for more details.
*/
struct trn_cell_extension_dos_param {
u8 type;
u64 value;
};
struct trn_cell_extension_dos {
u8 n_params;
struct trn_cell_extension_dos_param params[n_params];
};