diff options
Diffstat (limited to 'src/feature/hs/hs_service.h')
| -rw-r--r-- | src/feature/hs/hs_service.h | 185 |
1 files changed, 105 insertions, 80 deletions
diff --git a/src/feature/hs/hs_service.h b/src/feature/hs/hs_service.h index 5f43233ea1..b5bff5bee5 100644 --- a/src/feature/hs/hs_service.h +++ b/src/feature/hs/hs_service.h @@ -1,4 +1,4 @@ -/* Copyright (c) 2016-2019, The Tor Project, Inc. */ +/* Copyright (c) 2016-2020, The Tor Project, Inc. */ /* See LICENSE for licensing information */ /** @@ -21,88 +21,92 @@ /* Trunnel */ #include "trunnel/hs/cell_establish_intro.h" -/* When loading and configuring a service, this is the default version it will +#include "ext/ht.h" + +/** When loading and configuring a service, this is the default version it will * be configured for as it is possible that no HiddenServiceVersion is * present. */ #define HS_SERVICE_DEFAULT_VERSION HS_VERSION_THREE -/* As described in the specification, service publishes their next descriptor +/** As described in the specification, service publishes their next descriptor * at a random time between those two values (in seconds). */ #define HS_SERVICE_NEXT_UPLOAD_TIME_MIN (60 * 60) +/** Maximum interval for uploading next descriptor (in seconds). */ #define HS_SERVICE_NEXT_UPLOAD_TIME_MAX (120 * 60) -/* Service side introduction point. */ +/** Service side introduction point. */ typedef struct hs_service_intro_point_t { - /* Top level intropoint "shared" data between client/service. */ + /** Top level intropoint "shared" data between client/service. */ hs_intropoint_t base; - /* Onion key of the introduction point used to extend to it for the ntor + /** Onion key of the introduction point used to extend to it for the ntor * handshake. */ curve25519_public_key_t onion_key; - /* Authentication keypair used to create the authentication certificate + /** Authentication keypair used to create the authentication certificate * which is published in the descriptor. */ ed25519_keypair_t auth_key_kp; - /* Encryption keypair for the "ntor" type. */ + /** Encryption keypair for the "ntor" type. */ curve25519_keypair_t enc_key_kp; - /* Legacy key if that intro point doesn't support v3. This should be used if + /** Legacy key if that intro point doesn't support v3. This should be used if * the base object legacy flag is set. */ crypto_pk_t *legacy_key; - /* Legacy key SHA1 public key digest. This should be used only if the base + /** Legacy key SHA1 public key digest. This should be used only if the base * object legacy flag is set. */ uint8_t legacy_key_digest[DIGEST_LEN]; - /* Amount of INTRODUCE2 cell accepted from this intro point. */ + /** Amount of INTRODUCE2 cell accepted from this intro point. */ uint64_t introduce2_count; - /* Maximum number of INTRODUCE2 cell this intro point should accept. */ + /** Maximum number of INTRODUCE2 cell this intro point should accept. */ uint64_t introduce2_max; - /* The time at which this intro point should expire and stop being used. */ + /** The time at which this intro point should expire and stop being used. */ time_t time_to_expire; - /* The amount of circuit creation we've made to this intro point. This is + /** The amount of circuit creation we've made to this intro point. This is * incremented every time we do a circuit relaunch on this intro point which * is triggered when the circuit dies but the node is still in the * consensus. After MAX_INTRO_POINT_CIRCUIT_RETRIES, we give up on it. */ uint32_t circuit_retries; - /* Set if this intro point has an established circuit. */ - unsigned int circuit_established : 1; - - /* Replay cache recording the encrypted part of an INTRODUCE2 cell that the + /** Replay cache recording the encrypted part of an INTRODUCE2 cell that the * 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. */ +/** Object handling introduction points of a service. */ typedef struct hs_service_intropoints_t { - /* The time at which we've started our retry period to build circuits. We + /** The time at which we've started our retry period to build circuits. We * don't want to stress circuit creation so we can only retry for a certain * time and then after we stop and wait. */ time_t retry_period_started; - /* Number of circuit we've launched during a single retry period. */ + /** Number of circuit we've launched during a single retry period. */ unsigned int num_circuits_launched; - /* Contains the current hs_service_intro_point_t objects indexed by + /** Contains the current hs_service_intro_point_t objects indexed by * authentication public key. */ digest256map_t *map; - /* Contains node's identity key digest that were introduction point for this + /** Contains node's identity key digest that were introduction point for this * descriptor but were retried to many times. We keep those so we avoid * re-picking them over and over for a circuit retry period. * XXX: Once we have #22173, change this to only use ed25519 identity. */ digestmap_t *failed_id; } hs_service_intropoints_t; -/* Representation of a service descriptor. +/** Representation of a service descriptor. * * Some elements of the descriptor are mutable whereas others are immutable: - + * * Immutable elements are initialized once when the descriptor is built (when * service descriptors gets rotated). This means that these elements are * initialized once and then they don't change for the lifetime of the @@ -117,40 +121,42 @@ typedef struct hs_service_intropoints_t { * update_service_descriptor_intro_points(). */ typedef struct hs_service_descriptor_t { - /* Immutable: Client authorization ephemeral keypair. */ + /** Immutable: Client authorization ephemeral keypair. */ curve25519_keypair_t auth_ephemeral_kp; - /* Immutable: Descriptor cookie used to encrypt the descriptor, when the + /** Immutable: Descriptor cookie used to encrypt the descriptor, when the * client authorization is enabled */ uint8_t descriptor_cookie[HS_DESC_DESCRIPTOR_COOKIE_LEN]; - /* Immutable: Descriptor signing keypair. */ + /** Immutable: Descriptor signing keypair. */ ed25519_keypair_t signing_kp; - /* Immutable: Blinded keypair derived from the master identity public key. */ + /** Immutable: Blinded keypair derived from the master identity public + * key. */ ed25519_keypair_t blinded_kp; - /* Immutable: The time period number this descriptor has been created for. */ + /** Immutable: The time period number this descriptor has been created + * for. */ uint64_t time_period_num; /** Immutable: The OPE cipher for encrypting revision counters for this * descriptor. Tied to the descriptor blinded key. */ struct crypto_ope_t *ope_cipher; - /* Mutable: Decoded descriptor. This object is used for encoding when the + /** Mutable: Decoded descriptor. This object is used for encoding when the * service publishes the descriptor. */ hs_descriptor_t *desc; - /* Mutable: When is the next time when we should upload the descriptor. */ + /** Mutable: When is the next time when we should upload the descriptor. */ time_t next_upload_time; - /* Mutable: Introduction points assign to this descriptor which contains + /** Mutable: Introduction points assign to this descriptor which contains * hs_service_intropoints_t object indexed by authentication key (the RSA key * if the node is legacy). */ hs_service_intropoints_t intro_points; - /* Mutable: True iff we have missing intro points for this descriptor because - * we couldn't pick any nodes. */ + /** Mutable: True iff we have missing intro points for this descriptor + * because we couldn't pick any nodes. */ unsigned int missing_intro_points : 1; /** Mutable: List of the responsible HSDirs (their b64ed identity digest) @@ -160,20 +166,20 @@ typedef struct hs_service_descriptor_t { smartlist_t *previous_hsdirs; } hs_service_descriptor_t; -/* Service key material. */ +/** Service key material. */ typedef struct hs_service_keys_t { - /* Master identify public key. */ + /** Master identify public key. */ ed25519_public_key_t identity_pk; - /* Master identity private key. */ + /** Master identity private key. */ ed25519_secret_key_t identity_sk; - /* True iff the key is kept offline which means the identity_sk MUST not be + /** True iff the key is kept offline which means the identity_sk MUST not be * used in that case. */ unsigned int is_identify_key_offline : 1; } hs_service_keys_t; /** Service side configuration of client authorization. */ typedef struct hs_service_authorized_client_t { - /* The client auth public key used to encrypt the descriptor cookie. */ + /** The client auth public key used to encrypt the descriptor cookie. */ curve25519_public_key_t client_pk; } hs_service_authorized_client_t; @@ -186,115 +192,129 @@ typedef enum { HS_CIRCUIT_ID_PROTOCOL_HAPROXY } hs_circuit_id_protocol_t; -/* Service configuration. The following are set from the torrc options either +/** Service configuration. The following are set from the torrc options either * set by the configuration file or by the control port. Nothing else should * change those values. */ typedef struct hs_service_config_t { - /* Protocol version of the service. Specified by HiddenServiceVersion + /** Protocol version of the service. Specified by HiddenServiceVersion * option. */ uint32_t version; - /* Have we explicitly set HiddenServiceVersion? */ + /** Have we explicitly set HiddenServiceVersion? */ unsigned int hs_version_explicitly_set : 1; - /* List of rend_service_port_config_t */ + /** List of rend_service_port_config_t */ smartlist_t *ports; - /* Path on the filesystem where the service persistent data is stored. NULL + /** Path on the filesystem where the service persistent data is stored. NULL * if the service is ephemeral. Specified by HiddenServiceDir option. */ char *directory_path; - /* The maximum number of simultaneous streams per rendezvous circuit that + /** The maximum number of simultaneous streams per rendezvous circuit that * are allowed to be created. No limit if 0. Specified by * HiddenServiceMaxStreams option. */ uint64_t max_streams_per_rdv_circuit; - /* If true, we close circuits that exceed the max_streams_per_rdv_circuit + /** If true, we close circuits that exceed the max_streams_per_rdv_circuit * limit. Specified by HiddenServiceMaxStreamsCloseCircuit option. */ unsigned int max_streams_close_circuit : 1; - /* How many introduction points this service has. Specified by + /** How many introduction points this service has. Specified by * HiddenServiceNumIntroductionPoints option. */ unsigned int num_intro_points; - /* True iff the client auth is enabled. */ + /** True iff the client auth is enabled. */ unsigned int is_client_auth_enabled : 1; - /* List of hs_service_authorized_client_t's of clients that may access this + /** List of hs_service_authorized_client_t's of clients that may access this * service. Specified by HiddenServiceAuthorizeClient option. */ smartlist_t *clients; - /* True iff we allow request made on unknown ports. Specified by + /** True iff we allow request made on unknown ports. Specified by * HiddenServiceAllowUnknownPorts option. */ unsigned int allow_unknown_ports : 1; - /* If true, this service is a Single Onion Service. Specified by + /** If true, this service is a Single Onion Service. Specified by * HiddenServiceSingleHopMode and HiddenServiceNonAnonymousMode options. */ unsigned int is_single_onion : 1; - /* If true, allow group read permissions on the directory_path. Specified by + /** If true, allow group read permissions on the directory_path. Specified by * HiddenServiceDirGroupReadable option. */ unsigned int dir_group_readable : 1; - /* Is this service ephemeral? */ + /** Is this service ephemeral? */ unsigned int is_ephemeral : 1; - /* Does this service export the circuit ID of its clients? */ + /** 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; + + /** If set, contains the Onion Balance master ed25519 public key (taken from + * an .onion addresses) that this tor instance serves as backend. */ + smartlist_t *ob_master_pubkeys; } hs_service_config_t; -/* Service state. */ +/** Service state. */ typedef struct hs_service_state_t { - /* The time at which we've started our retry period to build circuits. We + /** The time at which we've started our retry period to build circuits. We * don't want to stress circuit creation so we can only retry for a certain * time and then after we stop and wait. */ time_t intro_circ_retry_started_time; - /* Number of circuit we've launched during a single retry period. This + /** Number of circuit we've launched during a single retry period. This * should never go over MAX_INTRO_CIRCS_PER_PERIOD. */ unsigned int num_intro_circ_launched; - /* Replay cache tracking the REND_COOKIE found in INTRODUCE2 cell to detect + /** Replay cache tracking the REND_COOKIE found in INTRODUCE2 cell to detect * repeats. Clients may send INTRODUCE1 cells for the same rendezvous point * through two or more different introduction points; when they do, this * keeps us from launching multiple simultaneous attempts to connect to the * same rend point. */ replaycache_t *replay_cache_rend_cookie; - /* When is the next time we should rotate our descriptors. This is has to be + /** When is the next time we should rotate our descriptors. This is has to be * done at the start time of the next SRV protocol run. */ time_t next_rotation_time; + + /* If this is an onionbalance instance, this is an array of subcredentials + * that should be used when decrypting an INTRO2 cell. If this is not an + * onionbalance instance, this is NULL. + * See [ONIONBALANCE] section in rend-spec-v3.txt for more details . */ + hs_subcredential_t *ob_subcreds; + /* Number of OB subcredentials */ + size_t n_ob_subcreds; } hs_service_state_t; -/* Representation of a service running on this tor instance. */ +/** Representation of a service running on this tor instance. */ typedef struct hs_service_t { - /* Onion address base32 encoded and NUL terminated. We keep it for logging + /** Onion address base32 encoded and NUL terminated. We keep it for logging * purposes so we don't have to build it everytime. */ char onion_address[HS_SERVICE_ADDR_LEN_BASE32 + 1]; - /* Hashtable node: use to look up the service by its master public identity + /** Hashtable node: use to look up the service by its master public identity * key in the service global map. */ HT_ENTRY(hs_service_t) hs_service_node; - /* Service state which contains various flags and counters. */ + /** Service state which contains various flags and counters. */ hs_service_state_t state; - /* Key material of the service. */ + /** Key material of the service. */ hs_service_keys_t keys; - /* Configuration of the service. */ + /** Configuration of the service. */ hs_service_config_t config; - /* Current descriptor. */ + /** Current descriptor. */ hs_service_descriptor_t *desc_current; - /* Next descriptor. */ + /** Next descriptor. */ hs_service_descriptor_t *desc_next; - - /* XXX: Credential (client auth.) #20700. */ - } hs_service_t; -/* For the service global hash map, we define a specific type for it which +/** For the service global hash map, we define a specific type for it which * will make it safe to use and specific to some controlled parameters such as * the hashing function and how to compare services. */ typedef HT_HEAD(hs_service_ht, hs_service_t) hs_service_ht; @@ -308,9 +328,14 @@ void hs_service_free_all(void); /* Service new/free functions. */ hs_service_t *hs_service_new(const or_options_t *options); void hs_service_free_(hs_service_t *service); +/** + * @copydoc hs_service_free_ + * + * Additionally, set the pointer <b>s</b> to NULL. + **/ #define hs_service_free(s) FREE_AND_NULL(hs_service_t, hs_service_free_, (s)) -unsigned int hs_service_get_num_services(void); +MOCK_DECL(unsigned int, hs_service_get_num_services,(void)); void hs_service_stage_services(const smartlist_t *service_list); int hs_service_load_all_keys(void); int hs_service_get_version_from_key(const hs_service_t *service); @@ -330,8 +355,6 @@ int hs_service_receive_introduce2(origin_circuit_t *circ, const uint8_t *payload, size_t payload_len); -void hs_service_intro_circ_has_closed(origin_circuit_t *circ); - char *hs_service_lookup_current_desc(const ed25519_public_key_t *pk); hs_service_add_ephemeral_status_t @@ -350,6 +373,8 @@ void hs_service_upload_desc_to_dir(const char *encoded_desc, hs_circuit_id_protocol_t hs_service_exports_circuit_id(const ed25519_public_key_t *pk); +void hs_service_dump_stats(int severity); + #ifdef HS_SERVICE_PRIVATE #ifdef TOR_UNIT_TESTS @@ -361,7 +386,10 @@ STATIC hs_service_t *get_first_service(void); STATIC hs_service_intro_point_t *service_intro_point_find_by_ident( const hs_service_t *service, const hs_ident_circuit_t *ident); -#endif + +MOCK_DECL(STATIC unsigned int, count_desc_circuit_established, + (const hs_service_descriptor_t *desc)); +#endif /* defined(TOR_UNIT_TESTS) */ /* Service accessors. */ STATIC hs_service_t *find_service(hs_service_ht *map, @@ -369,10 +397,7 @@ STATIC hs_service_t *find_service(hs_service_ht *map, STATIC void remove_service(hs_service_ht *map, hs_service_t *service); STATIC int register_service(hs_service_ht *map, hs_service_t *service); /* Service introduction point functions. */ -STATIC hs_service_intro_point_t *service_intro_point_new( - const extend_info_t *ei, - unsigned int is_legacy, - unsigned int supports_ed25519_link_handshake_any); +STATIC hs_service_intro_point_t *service_intro_point_new(const node_t *node); STATIC void service_intro_point_free_(hs_service_intro_point_t *ip); #define service_intro_point_free(ip) \ FREE_AND_NULL(hs_service_intro_point_t, \ |