[tor-commits] [tor/master] Implement Prop #260: Single Onion Services

commit b560f852f220f5630f6bf5a300d15b40c9c235cf Author: teor (Tim Wilson-Brown) teor2345@gmail.com Date: Thu Jul 14 14:04:02 2016 +1000

Implement Prop #260: Single Onion Services

Add experimental OnionServiceSingleHopMode and OnionServiceNonAnonymousMode options. When both are set to 1, every hidden service on a tor instance becomes a non-anonymous Single Onion Service. Single Onions make one-hop (direct) connections to their introduction and renzedvous points. One-hop circuits make Single Onion servers easily locatable, but clients remain location-anonymous. This is compatible with the existing hidden service implementation, and works on the current tor network without any changes to older relays or clients.

Implements proposal #260, completes ticket #17178. Patch by teor & asn.

squash! fixup! fixup! fixup! fixup! fixup! fixup! fixup! fixup! fixup! fixup! fixup! fixup! fixup! Implement Prop #260: Single Onion Services

Redesign single onion service poisoning.

When in OnionServiceSingleHopMode, each hidden service key is poisoned (marked as non-anonymous) on creation by creating a poison file in the hidden service directory.

Existing keys are considered non-anonymous if this file exists, and anonymous if it does not.

Tor refuses to launch in OnionServiceSingleHopMode if any existing keys are anonymous. Similarly, it refuses to launch in anonymous client mode if any existing keys are non-anonymous.

Rewrite the unit tests to match and be more comprehensive. Adds a bonus unit test for rend_service_load_all_keys(). --- changes/feature17178 | 15 +++ doc/tor.1.txt | 35 +++++- src/or/circuitbuild.c | 9 +- src/or/circuitstats.c | 28 ++++- src/or/config.c | 160 +++++++++++++++++++++---- src/or/config.h | 2 + src/or/connection_edge.c | 29 ++++- src/or/directory.c | 12 +- src/or/directory.h | 3 + src/or/main.c | 13 ++- src/or/or.h | 21 ++++ src/or/rendclient.c | 49 ++++++-- src/or/rendclient.h | 3 + src/or/rendcommon.c | 48 ++++++++ src/or/rendcommon.h | 6 + src/or/rendservice.c | 299 +++++++++++++++++++++++++++++++++++++++++++---- src/or/rendservice.h | 9 +- src/test/test_hs.c | 207 ++++++++++++++++++++++++++++++++ src/test/test_options.c | 149 +++++++++++++++++++++++ 19 files changed, 1020 insertions(+), 77 deletions(-)

diff --git a/changes/feature17178 b/changes/feature17178 new file mode 100644 index 0000000..465f491 --- /dev/null +++ b/changes/feature17178 @@ -0,0 +1,15 @@ + o Major features (onion services): + - Add experimental OnionServiceSingleHopMode and + OnionServiceNonAnonymousMode options. When both are set to 1, every + hidden service on a tor instance becomes a non-anonymous Single Onion + Service. Single Onions make one-hop (direct) connections to their + introduction and renzedvous points. One-hop circuits make Single Onion + servers easily locatable, but clients remain location-anonymous. + This is compatible with the existing hidden service implementation, and + works on the current tor network without any changes to older relays or + clients. + Implements proposal #260, completes ticket #17178. Patch by teor & asn. + o Minor bug fixes (Tor2web): + - Prevent Tor2web clients running hidden services, these services are + not anonymous due to the one-hop client paths. + Fixes bug #19678. Patch by teor. diff --git a/doc/tor.1.txt b/doc/tor.1.txt index 0687991..bd25a61 100644 --- a/doc/tor.1.txt +++ b/doc/tor.1.txt @@ -1425,7 +1425,9 @@ The following options are useful only for clients (that is, if non-hidden-service hostnames through Tor. It **must only** be used when running a tor2web Hidden Service web proxy. To enable this option the compile time flag --enable-tor2web-mode must be - specified. (Default: 0) + specified. Since Tor2webMode is non-anonymous, you can not run an + anonymous Hidden Service on a tor version compiled with Tor2webMode. + (Default: 0)

[[Tor2webRendezvousPoints]] **Tor2webRendezvousPoints** __node__,__node__,__...__:: A list of identity fingerprints, nicknames, country codes and @@ -2375,6 +2377,37 @@ 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. (Default: 3)

+[[OnionServiceSingleHopMode]] **OnionServiceSingleHopMode** **0**|**1**:: + **Experimental - Non Anonymous** Hidden Services on a tor instance in + OnionServiceSingleHopMode make one-hop (direct) circuits between the onion + service server, and the introduction and rendezvous points. (Onion service + descriptors are still posted using 3-hop paths, to avoid onion service + directories blocking the service.) + This option makes every hidden service instance hosted by a tor instance a + Single Onion Service. One-hop circuits make Single Onion servers easily + locatable, but clients remain location-anonymous. However, the fact that a + client is accessing a Single Onion rather than a Hidden Service may be + statistically distinguishable. + + **WARNING:** Once a hidden service directory has been used by a tor + instance in OnionServiceSingleHopMode, it can **NEVER** be used again for + a hidden service. It is best practice to create a new hidden service + directory, key, and address for each new Single Onion Service and Hidden + Service. It is not possible to run Single Onion Services and Hidden + Services from the same tor instance: they should be run on different + servers with different IP addresses. + + OnionServiceSingleHopMode requires OnionServiceNonAnonymousMode to be set + to 1. Since a Single Onion is non-anonymous, you can not to run an + anonymous SOCKSPort on the same tor instance as a Single Onion service. + (Default: 0) + +[[OnionServiceNonAnonymousMode]] **OnionServiceNonAnonymousMode** **0**|**1**:: + Makes hidden services non-anonymous on this tor instance. Allows the + non-anonymous OnionServiceSingleHopMode. Enables direct connections in the + server-side hidden service protocol. + (Default: 0) + TESTING NETWORK OPTIONS -----------------------

diff --git a/src/or/circuitbuild.c b/src/or/circuitbuild.c index 2e7ea2f..69a8a9c 100644 --- a/src/or/circuitbuild.c +++ b/src/or/circuitbuild.c @@ -28,6 +28,7 @@ #include "connection_edge.h" #include "connection_or.h" #include "control.h" +#include "crypto.h" #include "directory.h" #include "entrynodes.h" #include "main.h" @@ -38,14 +39,14 @@ #include "onion_tap.h" #include "onion_fast.h" #include "policies.h" -#include "transports.h" #include "relay.h" +#include "rendcommon.h" #include "rephist.h" #include "router.h" #include "routerlist.h" #include "routerparse.h" #include "routerset.h" -#include "crypto.h" +#include "transports.h"

static channel_t * channel_connect_for_circuit(const tor_addr_t *addr, uint16_t port, @@ -1996,7 +1997,9 @@ onion_pick_cpath_exit(origin_circuit_t *circ, extend_info_t *exit_ei) cpath_build_state_t *state = circ->build_state;

if (state->onehop_tunnel) { - log_debug(LD_CIRC, "Launching a one-hop circuit for dir tunnel."); + log_debug(LD_CIRC, "Launching a one-hop circuit for dir tunnel%s.", + (rend_allow_non_anonymous_connection(get_options()) ? + ", or intro or rendezvous connection" : "")); state->desired_path_len = 1; } else { int r = new_route_len(circ->base_.purpose, exit_ei, nodelist_get_list()); diff --git a/src/or/circuitstats.c b/src/or/circuitstats.c index f4db64e..fe8860e 100644 --- a/src/or/circuitstats.c +++ b/src/or/circuitstats.c @@ -21,6 +21,8 @@ #include "control.h" #include "main.h" #include "networkstatus.h" +#include "rendclient.h" +#include "rendservice.h" #include "statefile.h"

#undef log @@ -81,12 +83,14 @@ get_circuit_build_timeout_ms(void)

/** * This function decides if CBT learning should be disabled. It returns - * true if one or more of the following four conditions are met: + * true if one or more of the following conditions are met: * * 1. If the cbtdisabled consensus parameter is set. * 2. If the torrc option LearnCircuitBuildTimeout is false. * 3. If we are a directory authority * 4. If we fail to write circuit build time history to our state file. + * 5. If we are compiled or configured in Tor2web mode + * 6. If we are configured in Single Onion mode */ int circuit_build_times_disabled(void) @@ -94,14 +98,30 @@ circuit_build_times_disabled(void) if (unit_tests) { return 0; } else { + const or_options_t *options = get_options(); int consensus_disabled = networkstatus_get_param(NULL, "cbtdisabled", 0, 0, 1); - int config_disabled = !get_options()->LearnCircuitBuildTimeout; - int dirauth_disabled = get_options()->AuthoritativeDir; + int config_disabled = !options->LearnCircuitBuildTimeout; + int dirauth_disabled = options->AuthoritativeDir; int state_disabled = did_last_state_file_write_fail() ? 1 : 0; + /* LearnCircuitBuildTimeout and Tor2webMode/OnionServiceSingleHopMode are + * incompatible in two ways: + * + * - LearnCircuitBuildTimeout results in a low CBT, which + * Single Onion use of one-hop intro and rendezvous circuits lowers + * much further, producing *far* too many timeouts. + * + * - The adaptive CBT code does not update its timeout estimate + * using build times for single-hop circuits. + * + * If we fix both of these issues someday, we should test + * these modes with LearnCircuitBuildTimeout on again. */ + int tor2web_disabled = rend_client_allow_non_anonymous_connection(options); + int single_onion_disabled = rend_service_allow_non_anonymous_connection( + options);

if (consensus_disabled || config_disabled || dirauth_disabled || - state_disabled) { + state_disabled || tor2web_disabled || single_onion_disabled) { #if 0 log_debug(LD_CIRC, "CircuitBuildTime learning is disabled. " diff --git a/src/or/config.c b/src/or/config.c index 136958c..f7f1f57 100644 --- a/src/or/config.c +++ b/src/or/config.c @@ -18,6 +18,7 @@ #include "circuitlist.h" #include "circuitmux.h" #include "circuitmux_ewma.h" +#include "circuitstats.h" #include "config.h" #include "connection.h" #include "connection_edge.h" @@ -297,6 +298,8 @@ static config_var_t option_vars_[] = { V(HidServAuth, LINELIST, NULL), V(CloseHSClientCircuitsImmediatelyOnTimeout, BOOL, "0"), V(CloseHSServiceRendCircuitsImmediatelyOnTimeout, BOOL, "0"), + V(OnionServiceSingleHopMode, BOOL, "0"), + V(OnionServiceNonAnonymousMode,BOOL, "0"), V(HTTPProxy, STRING, NULL), V(HTTPProxyAuthenticator, STRING, NULL), V(HTTPSProxy, STRING, NULL), @@ -1558,10 +1561,10 @@ options_act(const or_options_t *old_options) if (consider_adding_dir_servers(options, old_options) < 0) return -1;

-#ifdef NON_ANONYMOUS_MODE_ENABLED - log_warn(LD_GENERAL, "This copy of Tor was compiled to run in a " - "non-anonymous mode. It will provide NO ANONYMITY."); -#endif + if (rend_non_anonymous_mode_enabled(options)) { + log_warn(LD_GENERAL, "This copy of Tor was compiled or configured to run " + "in a non-anonymous mode. It will provide NO ANONYMITY."); + }

#ifdef ENABLE_TOR2WEB_MODE /* LCOV_EXCL_START */ @@ -1723,8 +1726,27 @@ options_act(const or_options_t *old_options)

monitor_owning_controller_process(options->OwningControllerProcess);

+ /* We must create new keys after we poison the directories, because our + * poisoning code checks for existing keys, and refuses to modify their + * directories. */ + + /* If we use the insecure OnionServiceSingleHopMode, make sure we poison any + new hidden service directories, so that we never accidentally launch the + non-anonymous hidden services thinking they are anonymous. */ + if (running_tor && rend_service_allow_non_anonymous_connection(options)) { + if (options->RendConfigLines && !num_rend_services()) { + log_warn(LD_BUG,"Error: hidden services configured, but not parsed."); + return -1; + } + if (rend_service_poison_new_single_onion_dirs(NULL) < 0) { + log_warn(LD_GENERAL,"Failed to mark new hidden services as Single " + "Onion."); + return -1; + } + } + /* reload keys as needed for rendezvous services. */ - if (rend_service_load_all_keys()<0) { + if (rend_service_load_all_keys(NULL)<0) { log_warn(LD_GENERAL,"Error loading rendezvous service keys"); return -1; } @@ -2796,6 +2818,88 @@ warn_about_relative_paths(or_options_t *options) } }

+/* Validate options related to OnionServiceSingleHopMode. + * Modifies some options that are incompatible with OnionServiceSingleHopMode. + * On failure returns -1, and sets *msg to an error string. + * Returns 0 on success. */ +STATIC int +options_validate_single_onion(or_options_t *options, char **msg) +{ + /* You must set OnionServiceNonAnonymousMode to 1 to use + * OnionServiceSingleHopMode */ + if (options->OnionServiceSingleHopMode && + !rend_service_non_anonymous_mode_enabled(options)) { + REJECT("OnionServiceSingleHopMode does not provide any server anonymity. " + "It must be used with OnionServiceNonAnonymousMode set to 1."); + } + + /* If you have OnionServiceNonAnonymousMode set, you must use + * OnionServiceSingleHopMode. */ + if (rend_service_non_anonymous_mode_enabled(options) && + !options->OnionServiceSingleHopMode) { + REJECT("OnionServiceNonAnonymousMode does not provide any server " + "anonymity. It must be used with OnionServiceSingleHopMode set to " + "1."); + } + + /* If you run an anonymous client with an active Single Onion service, the + * client loses anonymity. */ + const int client_port_set = (options->SocksPort_set || + options->TransPort_set || + options->NATDPort_set || + options->DNSPort_set); + if (options->OnionServiceSingleHopMode && client_port_set && + !options->Tor2webMode) { + REJECT("OnionServiceSingleHopMode is incompatible with using Tor as an " + "anonymous client. Please set Socks/Trans/NATD/DNSPort to 0, or " + "OnionServiceSingleHopMode to 0, or use the non-anonymous " + "Tor2webMode."); + } + + /* If you run a hidden service in non-anonymous mode, the hidden service + * loses anonymity, even if SOCKSPort / Tor2web mode isn't used. */ + if (!options->OnionServiceSingleHopMode && options->RendConfigLines + && options->Tor2webMode) { + REJECT("Non-anonymous (Tor2web) mode is incompatible with using Tor as a " + "hidden service. Please remove all HiddenServiceDir lines, or use " + "a version of tor compiled without --enable-tor2web-mode, or use " + "the non-anonymous OnionServiceSingleHopMode."); + } + + if (options->OnionServiceSingleHopMode + && options->UseEntryGuards) { + /* Single Onion services do not (and should not) use entry guards + * in any meaningful way. Further, Single Onions causes the hidden + * service code to do things which break the path bias + * detector, and it's far easier to turn off entry guards (and + * thus the path bias detector with it) than to figure out how to + * make a piece of code which cannot possibly help Single Onions, + * compatible with OnionServiceSingleHopMode. + */ + log_notice(LD_CONFIG, + "OnionServiceSingleHopMode is enabled; disabling " + "UseEntryGuards."); + options->UseEntryGuards = 0; + } + + /* Check if existing hidden service keys were created with a different + * setting of OnionServiceNonAnonymousMode, and refuse to launch if they + * have. We'll poison new keys in options_act() just before we create them. + */ + if (rend_service_list_verify_single_onion_poison(NULL, options) < 0) { + log_warn(LD_GENERAL, "We are configured with OnionServiceSingleHopMode " + "%d, but one or more hidden service keys were created in %s " + "mode. This is not allowed.", + rend_service_non_anonymous_mode_enabled(options) ? 1 : 0, + rend_service_non_anonymous_mode_enabled(options) ? + "an anonymous" : "a non-anonymous" + ); + return -1; + } + + return 0; +} + /** Return 0 if every setting in <b>options</b> is reasonable, is a * permissible transition from <b>old_options</b>, and none of the * testing-only settings differ from <b>default_options</b> unless in @@ -3291,25 +3395,11 @@ options_validate(or_options_t *old_options, or_options_t *options, options->PredictedPortsRelevanceTime = MAX_PREDICTED_CIRCS_RELEVANCE; }

-#ifdef ENABLE_TOR2WEB_MODE - if (options->Tor2webMode && options->LearnCircuitBuildTimeout) { - /* LearnCircuitBuildTimeout and Tor2webMode are incompatible in - * two ways: - * - * - LearnCircuitBuildTimeout results in a low CBT, which - * Tor2webMode's use of one-hop rendezvous circuits lowers - * much further, producing *far* too many timeouts. - * - * - The adaptive CBT code does not update its timeout estimate - * using build times for single-hop circuits. - * - * If we fix both of these issues someday, we should test - * Tor2webMode with LearnCircuitBuildTimeout on again. */ - log_notice(LD_CONFIG,"Tor2webMode is enabled; turning " - "LearnCircuitBuildTimeout off."); - options->LearnCircuitBuildTimeout = 0; - } + /* Check the Single Onion Service options */ + if (options_validate_single_onion(options, msg) < 0) + return -1;

+#ifdef ENABLE_TOR2WEB_MODE if (options->Tor2webMode && options->UseEntryGuards) { /* tor2web mode clients do not (and should not) use entry guards * in any meaningful way. Further, tor2web mode causes the hidden @@ -3353,6 +3443,17 @@ options_validate(or_options_t *old_options, or_options_t *options, return -1; }

+ /* OnionServiceSingleHopMode: one hop between the onion service server and + * intro and rendezvous points */ + if (options->OnionServiceSingleHopMode) { + log_warn(LD_CONFIG, + "OnionServiceSingleHopMode is set. Every hidden service on this " + "tor instance is NON-ANONYMOUS. If OnionServiceSingleHopMode is " + "disabled, Tor will refuse to launch hidden services from the " + "same directories, to protect against config errors. This " + "setting is for experimental use only."); + } + if (!options->LearnCircuitBuildTimeout && options->CircuitBuildTimeout && options->CircuitBuildTimeout < RECOMMENDED_MIN_CIRCUIT_BUILD_TIMEOUT) { log_warn(LD_CONFIG, @@ -4295,6 +4396,19 @@ options_transition_allowed(const or_options_t *old, return -1; }

+ if (old->OnionServiceSingleHopMode != new_val->OnionServiceSingleHopMode) { + *msg = tor_strdup("While Tor is running, changing " + "OnionServiceSingleHopMode is not allowed."); + return -1; + } + + if (old->OnionServiceNonAnonymousMode != + new_val->OnionServiceNonAnonymousMode) { + *msg = tor_strdup("While Tor is running, changing " + "OnionServiceNonAnonymousMode is not allowed."); + return -1; + } + if (old->DisableDebuggerAttachment && !new_val->DisableDebuggerAttachment) { *msg = tor_strdup("While Tor is running, disabling " diff --git a/src/or/config.h b/src/or/config.h index 7db66a3..208659a 100644 --- a/src/or/config.h +++ b/src/or/config.h @@ -166,6 +166,8 @@ extern struct config_format_t options_format; STATIC port_cfg_t *port_cfg_new(size_t namelen); STATIC void port_cfg_free(port_cfg_t *port); STATIC void or_options_free(or_options_t *options); +STATIC int options_validate_single_onion(or_options_t *options, + char **msg); STATIC int options_validate(or_options_t *old_options, or_options_t *options, or_options_t *default_options, diff --git a/src/or/connection_edge.c b/src/or/connection_edge.c index dc6b093..8ad0f0c 100644 --- a/src/or/connection_edge.c +++ b/src/or/connection_edge.c @@ -27,6 +27,7 @@ #include "control.h" #include "dns.h" #include "dnsserv.h" +#include "directory.h" #include "dirserv.h" #include "hibernate.h" #include "main.h" @@ -2271,6 +2272,7 @@ connection_ap_handshake_send_begin(entry_connection_t *ap_conn) char payload[CELL_PAYLOAD_SIZE]; int payload_len; int begin_type; + const or_options_t *options = get_options(); origin_circuit_t *circ; edge_connection_t *edge_conn = ENTRY_TO_EDGE_CONN(ap_conn); connection_t *base_conn = TO_CONN(edge_conn); @@ -2314,10 +2316,31 @@ connection_ap_handshake_send_begin(entry_connection_t *ap_conn)

begin_type = ap_conn->use_begindir ? RELAY_COMMAND_BEGIN_DIR : RELAY_COMMAND_BEGIN; + + /* Check that circuits are anonymised, based on their type. */ if (begin_type == RELAY_COMMAND_BEGIN) { -#ifndef NON_ANONYMOUS_MODE_ENABLED - tor_assert(circ->build_state->onehop_tunnel == 0); -#endif + /* This connection is a standard OR connection. + * Make sure its path length is anonymous, or that we're in a + * non-anonymous mode. */ + assert_circ_anonymity_ok(circ, options); + } else if (begin_type == RELAY_COMMAND_BEGIN_DIR) { + /* This connection is a begindir directory connection. + * Look at the linked directory connection to access the directory purpose. + * (This must be non-NULL, because we're doing begindir.) */ + tor_assert(base_conn->linked); + connection_t *linked_dir_conn_base = base_conn->linked_conn; + tor_assert(linked_dir_conn_base); + /* Sensitive directory connections must have an anonymous path length. + * Otherwise, directory connections are typically one-hop. + * This matches the earlier check for directory connection path anonymity + * in directory_initiate_command_rend(). */ + if (is_sensitive_dir_purpose(linked_dir_conn_base->purpose)) { + assert_circ_anonymity_ok(circ, options); + } + } else { + /* This code was written for the two connection types BEGIN and BEGIN_DIR + */ + tor_assert_unreached(); }

if (connection_edge_send_command(edge_conn, begin_type, diff --git a/src/or/directory.c b/src/or/directory.c index d37b5c2..52b14b9 100644 --- a/src/or/directory.c +++ b/src/or/directory.c @@ -1085,7 +1085,7 @@ directory_initiate_command(const tor_addr_t *or_addr, uint16_t or_port, * <b>dir_purpose</b> reveals sensitive information about a Tor * instance's client activities. (Such connections must be performed * through normal three-hop Tor circuits.) */ -static int +int is_sensitive_dir_purpose(uint8_t dir_purpose) { return ((dir_purpose == DIR_PURPOSE_HAS_FETCHED_RENDDESC_V2) || @@ -1140,12 +1140,10 @@ directory_initiate_command_rend(const tor_addr_port_t *or_addr_port,

log_debug(LD_DIR, "Initiating %s", dir_conn_purpose_to_string(dir_purpose));

-#ifndef NON_ANONYMOUS_MODE_ENABLED - tor_assert(!(is_sensitive_dir_purpose(dir_purpose) && - !anonymized_connection)); -#else - (void)is_sensitive_dir_purpose; -#endif + if (is_sensitive_dir_purpose(dir_purpose)) { + tor_assert(anonymized_connection || + rend_non_anonymous_mode_enabled(options)); + }

/* use encrypted begindir connections for everything except relays * this provides better protection for directory fetches */ diff --git a/src/or/directory.h b/src/or/directory.h index f04e7ab..9477948 100644 --- a/src/or/directory.h +++ b/src/or/directory.h @@ -132,7 +132,10 @@ int download_status_get_n_failures(const download_status_t *dls); int download_status_get_n_attempts(const download_status_t *dls); time_t download_status_get_next_attempt_at(const download_status_t *dls);

+/* Yes, these two functions are confusingly similar. + * Let's sort that out in #20077. */ int purpose_needs_anonymity(uint8_t dir_purpose, uint8_t router_purpose); +int is_sensitive_dir_purpose(uint8_t dir_purpose);

#ifdef TOR_UNIT_TESTS /* Used only by directory.c and test_dir.c */ diff --git a/src/or/main.c b/src/or/main.c index 03c2b7e..76f9f38 100644 --- a/src/or/main.c +++ b/src/or/main.c @@ -2833,11 +2833,6 @@ tor_init(int argc, char *argv[]) "Expect more bugs than usual."); }

-#ifdef NON_ANONYMOUS_MODE_ENABLED - log_warn(LD_GENERAL, "This copy of Tor was compiled to run in a " - "non-anonymous mode. It will provide NO ANONYMITY."); -#endif - if (network_init()<0) { log_err(LD_BUG,"Error initializing network; exiting."); return -1; @@ -2849,6 +2844,14 @@ tor_init(int argc, char *argv[]) return -1; }

+ /* The options are now initialised */ + const or_options_t *options = get_options(); + + if (rend_non_anonymous_mode_enabled(options)) { + log_warn(LD_GENERAL, "This copy of Tor was compiled or configured to run " + "in a non-anonymous mode. It will provide NO ANONYMITY."); + } + #ifndef _WIN32 if (geteuid()==0) log_warn(LD_GENERAL,"You are running Tor as root. You don't need to, " diff --git a/src/or/or.h b/src/or/or.h index 574f184..dd3ab8a 100644 --- a/src/or/or.h +++ b/src/or/or.h @@ -3701,6 +3701,27 @@ typedef struct { * they reach the normal circuit-build timeout. */ int CloseHSServiceRendCircuitsImmediatelyOnTimeout;

+ /** Onion Services in OnionServiceSingleHopMode make one-hop (direct) + * circuits between the onion service server, and the introduction and + * rendezvous points. (Onion service descriptors are still posted using + * 3-hop paths, to avoid onion service directories blocking the service.) + * This option makes every hidden service instance hosted by + * this tor instance a Single Onion Service. One-hop circuits make Single + * Onion servers easily locatable, but clients remain location-anonymous. + * OnionServiceSingleHopMode requires OnionServiceNonAnonymousMode to be set + * to 1. + * Use rend_service_allow_non_anonymous_connection() or + * rend_service_reveal_startup_time() instead of using this option directly. + */ + int OnionServiceSingleHopMode; + /* Makes hidden service clients and servers non-anonymous on this tor + * instance. Allows the non-anonymous OnionServiceSingleHopMode. Enables + * direct connections in the hidden service protocol. + * Use rend_service_non_anonymous_mode() instead of using this option + * directly. + */ + int OnionServiceNonAnonymousMode; + int ConnLimit; /**< Demanded minimum number of simultaneous connections. */ int ConnLimit_; /**< Maximum allowed number of simultaneous connections. */ int ConnLimit_high_thresh; /**< start trying to lower socket usage if we diff --git a/src/or/rendclient.c b/src/or/rendclient.c index 3a742fe..9d16e3b 100644 --- a/src/or/rendclient.c +++ b/src/or/rendclient.c @@ -134,6 +134,7 @@ int rend_client_send_introduction(origin_circuit_t *introcirc, origin_circuit_t *rendcirc) { + const or_options_t *options = get_options(); size_t payload_len; int r, v3_shift = 0; char payload[RELAY_PAYLOAD_SIZE]; @@ -150,10 +151,8 @@ rend_client_send_introduction(origin_circuit_t *introcirc, tor_assert(rendcirc->rend_data); tor_assert(!rend_cmp_service_ids(introcirc->rend_data->onion_address, rendcirc->rend_data->onion_address)); -#ifndef NON_ANONYMOUS_MODE_ENABLED - tor_assert(!(introcirc->build_state->onehop_tunnel)); - tor_assert(!(rendcirc->build_state->onehop_tunnel)); -#endif + assert_circ_anonymity_ok(introcirc, options); + assert_circ_anonymity_ok(rendcirc, options);

r = rend_cache_lookup_entry(introcirc->rend_data->onion_address, -1, &entry); @@ -387,6 +386,7 @@ int rend_client_introduction_acked(origin_circuit_t *circ, const uint8_t *request, size_t request_len) { + const or_options_t *options = get_options(); origin_circuit_t *rendcirc; (void) request; // XXXX Use this.

@@ -398,10 +398,9 @@ rend_client_introduction_acked(origin_circuit_t *circ, return -1; }

+ tor_assert(circ->build_state); tor_assert(circ->build_state->chosen_exit); -#ifndef NON_ANONYMOUS_MODE_ENABLED - tor_assert(!(circ->build_state->onehop_tunnel)); -#endif + assert_circ_anonymity_ok(circ, options); tor_assert(circ->rend_data);

/* For path bias: This circuit was used successfully. Valid @@ -416,9 +415,7 @@ rend_client_introduction_acked(origin_circuit_t *circ, log_info(LD_REND,"Received ack. Telling rend circ..."); rendcirc = circuit_get_ready_rend_circ_by_rend_data(circ->rend_data); if (rendcirc) { /* remember the ack */ -#ifndef NON_ANONYMOUS_MODE_ENABLED - tor_assert(!(rendcirc->build_state->onehop_tunnel)); -#endif + assert_circ_anonymity_ok(rendcirc, options); circuit_change_purpose(TO_CIRCUIT(rendcirc), CIRCUIT_PURPOSE_C_REND_READY_INTRO_ACKED); /* Set timestamp_dirty, because circuit_expire_building expects @@ -1552,3 +1549,35 @@ rend_parse_service_authorization(const or_options_t *options, return res; }

+/* Can Tor client code make direct (non-anonymous) connections to introduction + * or rendezvous points? + * Returns true if tor was compiled with NON_ANONYMOUS_MODE_ENABLED, and is + * configured in Tor2web mode. */ +int +rend_client_allow_non_anonymous_connection(const or_options_t *options) +{ + /* Tor2web support needs to be compiled in to a tor binary. */ +#ifdef NON_ANONYMOUS_MODE_ENABLED + /* Tor2web */ + return options->Tor2webMode ? 1 : 0; +#else + (void)options; + return 0; +#endif +} + +/* At compile-time, was non-anonymous mode enabled via + * NON_ANONYMOUS_MODE_ENABLED ? */ +int +rend_client_non_anonymous_mode_enabled(const or_options_t *options) +{ + (void)options; + /* Tor2web support needs to be compiled in to a tor binary. */ +#ifdef NON_ANONYMOUS_MODE_ENABLED + /* Tor2web */ + return 1; +#else + return 0; +#endif +} + diff --git a/src/or/rendclient.h b/src/or/rendclient.h index e90dac0..b8f8c2f 100644 --- a/src/or/rendclient.h +++ b/src/or/rendclient.h @@ -51,5 +51,8 @@ rend_service_authorization_t *rend_client_lookup_service_authorization( const char *onion_address); void rend_service_authorization_free_all(void);

+int rend_client_allow_non_anonymous_connection(const or_options_t *options); +int rend_client_non_anonymous_mode_enabled(const or_options_t *options); + #endif

diff --git a/src/or/rendcommon.c b/src/or/rendcommon.c index 01b0766..12dd0f4 100644 --- a/src/or/rendcommon.c +++ b/src/or/rendcommon.c @@ -1067,3 +1067,51 @@ rend_auth_decode_cookie(const char *cookie_in, uint8_t *cookie_out, return res; }

+/* Is this a rend client or server that allows direct (non-anonymous) + * connections? + * Clients must be specifically compiled and configured in this mode. + * Onion services can be configured to start in this mode. + * Prefer rend_client_allow_non_anonymous_connection() or + * rend_service_allow_non_anonymous_connection() whenever possible, so that + * checks are specific to Single Onion Services or Tor2web. */ +int +rend_allow_non_anonymous_connection(const or_options_t* options) +{ + return (rend_client_allow_non_anonymous_connection(options) + || rend_service_allow_non_anonymous_connection(options)); +} + +/* Is this a rend client or server in non-anonymous mode? + * Clients must be specifically compiled in this mode. + * Onion services can be configured to start in this mode. + * Prefer rend_client_non_anonymous_mode_enabled() or + * rend_service_non_anonymous_mode_enabled() whenever possible, so that checks + * are specific to Single Onion Services or Tor2web. */ +int +rend_non_anonymous_mode_enabled(const or_options_t *options) +{ + return (rend_client_non_anonymous_mode_enabled(options) + || rend_service_non_anonymous_mode_enabled(options)); +} + +/* Make sure that tor only builds one-hop circuits when they would not + * compromise user anonymity. + * + * One-hop circuits are permitted in Tor2webMode or OnionServiceSingleHopMode. + * + * Tor2webMode and OnionServiceSingleHopMode are also allowed to make + * multi-hop circuits. For example, single onion HSDir circuits are 3-hop to + * prevent denial of service. + */ +void +assert_circ_anonymity_ok(origin_circuit_t *circ, + const or_options_t *options) +{ + tor_assert(options); + tor_assert(circ); + tor_assert(circ->build_state); + + if (circ->build_state->onehop_tunnel) { + tor_assert(rend_allow_non_anonymous_connection(options)); + } +} diff --git a/src/or/rendcommon.h b/src/or/rendcommon.h index 88cf512..090e6f2 100644 --- a/src/or/rendcommon.h +++ b/src/or/rendcommon.h @@ -77,5 +77,11 @@ int rend_auth_decode_cookie(const char *cookie_in, rend_auth_type_t *auth_type_out, char **err_msg_out);

+int rend_allow_non_anonymous_connection(const or_options_t* options); +int rend_non_anonymous_mode_enabled(const or_options_t *options); + +void assert_circ_anonymity_ok(origin_circuit_t *circ, + const or_options_t *options); + #endif

diff --git a/src/or/rendservice.c b/src/or/rendservice.c index fa147ba..0ba9205 100644 --- a/src/or/rendservice.c +++ b/src/or/rendservice.c @@ -20,6 +20,7 @@ #include "main.h" #include "networkstatus.h" #include "nodelist.h" +#include "policies.h" #include "rendclient.h" #include "rendcommon.h" #include "rendservice.h" @@ -949,6 +950,208 @@ rend_service_update_descriptor(rend_service_t *service) } }

+static const char *sos_poison_fname = "non_anonymous_hidden_service"; + +/* Allocate and return a string containing the path to the single onion + * poison file in service. + * The caller must free this path. + * Returns NULL if there is no directory for service. */ +static char * +sos_poison_path(const rend_service_t *service) +{ + char *poison_path; + + tor_assert(service->directory); + + tor_asprintf(&poison_path, "%s%s%s", + service->directory, PATH_SEPARATOR, sos_poison_fname); + + return poison_path; +} + +/** Return True if hidden services <b>service> has been poisoned by single + * onion mode. */ +static int +service_is_single_onion_poisoned(const rend_service_t *service) +{ + char *poison_fname = NULL; + file_status_t fstatus; + + if (!service->directory) { + return 0; + } + + poison_fname = sos_poison_path(service); + tor_assert(poison_fname); + + fstatus = file_status(poison_fname); + tor_free(poison_fname); + + /* If this fname is occupied, the hidden service has been poisoned. */ + if (fstatus == FN_FILE || fstatus == FN_EMPTY) { + return 1; + } + + return 0; +} + +/* Return 1 if the private key file for service exists and has a non-zero size, + * and 0 otherwise. */ +static int +rend_service_private_key_exists(const rend_service_t *service) +{ + char *private_key_path = rend_service_path(service, private_key_fname); + const file_status_t private_key_status = file_status(private_key_path); + tor_free(private_key_path); + /* Only non-empty regular private key files could have been used before. */ + return private_key_status == FN_FILE; +} + +/** Check the single onion service poison state of all existing hidden service + * directories: + * - If each service is poisoned, and we are in OnionServiceSingleHopMode, + * return 0, + * - If each service is not poisoned, and we are not in + * OnionServiceSingleHopMode, return 0, + * - Otherwise, the poison state is invalid, and a service that was created in + * one mode is being used in the other, return -1. + * Hidden service directories without keys are not checked for consistency. + * When their keys are created, they will be poisoned (if needed). + * If a <b>service_list</b> is provided, treat it + * as the list of hidden services (used in unittests). */ +int +rend_service_list_verify_single_onion_poison(const smartlist_t *service_list, + const or_options_t *options) +{ + const smartlist_t *s_list; + /* If no special service list is provided, then just use the global one. */ + if (!service_list) { + if (!rend_service_list) { /* No global HS list. Nothing to see here. */ + return 0; + } + + s_list = rend_service_list; + } else { + s_list = service_list; + } + + int consistent = 1; + SMARTLIST_FOREACH_BEGIN(s_list, const rend_service_t *, s) { + if (service_is_single_onion_poisoned(s) != + rend_service_allow_non_anonymous_connection(options) && + rend_service_private_key_exists(s)) { + consistent = 0; + } + } SMARTLIST_FOREACH_END(s); + + return consistent ? 0 : -1; +} + +/*** Helper for rend_service_poison_new_single_onion_dirs(). When in single + * onion mode, add a file to this hidden service directory that marks it as a + * single onion hidden service. Returns 0 when a directory is successfully + * poisoned, or if it is already poisoned. Returns -1 on a failure to read + * the directory or write the poison file, or if there is an existing private + * key file in the directory. (The service should have been poisoned when the + * key was created.) */ +static int +poison_new_single_onion_hidden_service_dir(const rend_service_t *service) +{ + /* We must only poison directories if we're in Single Onion mode */ + tor_assert(rend_service_allow_non_anonymous_connection(get_options())); + + int fd; + int retval = -1; + char *poison_fname = NULL; + + if (!service->directory) { + log_info(LD_REND, "Ephemeral HS started in OnionServiceSingleHopMode."); + return 0; + } + + /* Make sure we're only poisoning new hidden service directories */ + if (rend_service_private_key_exists(service)) { + log_warn(LD_BUG, "Tried to single onion poison a service directory after " + "the private key was created."); + return -1; + } + + poison_fname = sos_poison_path(service); + + switch (file_status(poison_fname)) { + case FN_DIR: + case FN_ERROR: + log_warn(LD_FS, "Can't read single onion poison file "%s"", + poison_fname); + goto done; + case FN_FILE: /* single onion poison file already exists. NOP. */ + case FN_EMPTY: /* single onion poison file already exists. NOP. */ + log_debug(LD_FS, "Tried to re-poison a single onion poisoned file "%s"", + poison_fname); + break; + case FN_NOENT: + fd = tor_open_cloexec(poison_fname, O_RDWR|O_CREAT|O_TRUNC, 0600); + if (fd < 0) { + log_warn(LD_FS, "Could not create single onion poison file %s", + poison_fname); + goto done; + } + close(fd); + break; + default: + tor_assert(0); + } + + retval = 0; + + done: + tor_free(poison_fname); + + return retval; +} + +/** We just got launched in OnionServiceSingleHopMode. That's a non-anoymous + * mode for hidden services; hence we should mark all new hidden service + * directories appropriately so that they are never launched as + * location-private hidden services again. (New directories don't have private + * key files.) + * If a <b>service_list</b> is provided, treat it as the list of hidden + * services (used in unittests). + * Return 0 on success, -1 on fail. */ +int +rend_service_poison_new_single_onion_dirs(const smartlist_t *service_list) +{ + /* We must only poison directories if we're in Single Onion mode */ + tor_assert(rend_service_allow_non_anonymous_connection(get_options())); + + const smartlist_t *s_list; + /* If no special service list is provided, then just use the global one. */ + if (!service_list) { + if (!rend_service_list) { /* No global HS list. Nothing to see here. */ + return 0; + } + + s_list = rend_service_list; + } else { + s_list = service_list; + } + + SMARTLIST_FOREACH_BEGIN(s_list, const rend_service_t *, s) { + if (!rend_service_private_key_exists(s)) { + if (poison_new_single_onion_hidden_service_dir(s) < 0) { + return -1; + } + } + } SMARTLIST_FOREACH_END(s); + + /* The keys for these services are linked to the server IP address */ + log_notice(LD_REND, "The configured onion service directories have been " + "used in single onion mode. They can not be used for anonymous " + "hidden services."); + + return 0; +} + /** Load and/or generate private keys for all hidden services, possibly * including keys for client authorization. Return 0 on success, -1 on * failure. */ @@ -1372,6 +1575,19 @@ rend_check_authorization(rend_service_t *service, return 1; }

+/* Can this service make a direct connection to ei? + * It must be a single onion service, and the firewall rules must allow ei. */ +static int +rend_service_use_direct_connection(const or_options_t* options, + const extend_info_t* ei) +{ + /* The prefer_ipv6 argument to fascist_firewall_allows_address_addr is + * ignored, because pref_only is 0. */ + return (rend_service_allow_direct_connection(options) && + fascist_firewall_allows_address_addr(&ei->addr, ei->port, + FIREWALL_OR_CONNECTION, 0, 0)); +} + /****** * Handle cells ******/ @@ -1421,9 +1637,7 @@ rend_service_receive_introduction(origin_circuit_t *circuit, goto err; }

-#ifndef NON_ANONYMOUS_MODE_ENABLED - tor_assert(!(circuit->build_state->onehop_tunnel)); -#endif + assert_circ_anonymity_ok(circuit, options); tor_assert(circuit->rend_data);

/* We'll use this in a bazillion log messages */ @@ -1627,6 +1841,11 @@ rend_service_receive_introduction(origin_circuit_t *circuit, for (i=0;i<MAX_REND_FAILURES;i++) { int flags = CIRCLAUNCH_NEED_CAPACITY | CIRCLAUNCH_IS_INTERNAL; if (circ_needs_uptime) flags |= CIRCLAUNCH_NEED_UPTIME; + /* A Single Onion Service only uses a direct connection if its + * firewall rules permit direct connections to the address. */ + if (rend_service_use_direct_connection(options, rp)) { + flags = flags | CIRCLAUNCH_ONEHOP_TUNNEL; + } launched = circuit_launch_by_extend_info( CIRCUIT_PURPOSE_S_CONNECT_REND, rp, flags);

@@ -1739,7 +1958,10 @@ find_rp_for_intro(const rend_intro_cell_t *intro, goto err; }

- rp = extend_info_from_node(node, 0); + /* Are we in single onion mode? */ + const int allow_direct = rend_service_allow_non_anonymous_connection( + get_options()); + rp = extend_info_from_node(node, allow_direct); if (!rp) { if (err_msg_out) { tor_asprintf(&err_msg, @@ -1764,6 +1986,10 @@ find_rp_for_intro(const rend_intro_cell_t *intro, goto err; }

+ /* rp is always set here: extend_info_dup guarantees a non-NULL result, and + * the other cases goto err. */ + tor_assert(rp); + /* Make sure the RP we are being asked to connect to is _not_ a private * address unless it's allowed. Let's avoid to build a circuit to our * second middle node and fail right after when extending to the RP. */ @@ -2538,6 +2764,10 @@ rend_service_relaunch_rendezvous(origin_circuit_t *oldcirc) log_info(LD_REND,"Reattempting rendezvous circuit to '%s'", safe_str(extend_info_describe(oldstate->chosen_exit)));

+ /* You'd think Single Onion Services would want to retry the rendezvous + * using a direct connection. But if it's blocked by a firewall, or the + * service is IPv6-only, or the rend point avoiding becoming a one-hop + * proxy, we need a 3-hop connection. */ newcirc = circuit_launch_by_extend_info(CIRCUIT_PURPOSE_S_CONNECT_REND, oldstate->chosen_exit, CIRCLAUNCH_NEED_CAPACITY|CIRCLAUNCH_IS_INTERNAL); @@ -2566,6 +2796,11 @@ rend_service_launch_establish_intro(rend_service_t *service, rend_intro_point_t *intro) { origin_circuit_t *launched; + int flags = CIRCLAUNCH_NEED_UPTIME|CIRCLAUNCH_IS_INTERNAL; + + if (rend_service_allow_direct_connection(get_options())) { + flags = flags | CIRCLAUNCH_ONEHOP_TUNNEL; + }

log_info(LD_REND, "Launching circuit to introduction point %s for service %s", @@ -2576,8 +2811,7 @@ rend_service_launch_establish_intro(rend_service_t *service,

++service->n_intro_circuits_launched; launched = circuit_launch_by_extend_info(CIRCUIT_PURPOSE_S_ESTABLISH_INTRO, - intro->extend_info, - CIRCLAUNCH_NEED_UPTIME|CIRCLAUNCH_IS_INTERNAL); + intro->extend_info, flags);

if (!launched) { log_info(LD_REND, @@ -2651,9 +2885,7 @@ rend_service_intro_has_opened(origin_circuit_t *circuit) int reason = END_CIRC_REASON_TORPROTOCOL;

tor_assert(circuit->base_.purpose == CIRCUIT_PURPOSE_S_ESTABLISH_INTRO); -#ifndef NON_ANONYMOUS_MODE_ENABLED - tor_assert(!(circuit->build_state->onehop_tunnel)); -#endif + assert_circ_anonymity_ok(circuit, get_options()); tor_assert(circuit->cpath); tor_assert(circuit->rend_data);

@@ -2720,6 +2952,7 @@ rend_service_intro_has_opened(origin_circuit_t *circuit) log_info(LD_REND, "Established circuit %u as introduction point for service %s", (unsigned)circuit->base_.n_circ_id, serviceid); + circuit_log_path(LOG_INFO, LD_REND, circuit);

/* Use the intro key instead of the service key in ESTABLISH_INTRO. */ crypto_pk_t *intro_key = circuit->intro_key; @@ -2849,9 +3082,7 @@ rend_service_rendezvous_has_opened(origin_circuit_t *circuit) tor_assert(circuit->base_.purpose == CIRCUIT_PURPOSE_S_CONNECT_REND); tor_assert(circuit->cpath); tor_assert(circuit->build_state); -#ifndef NON_ANONYMOUS_MODE_ENABLED - tor_assert(!(circuit->build_state->onehop_tunnel)); -#endif + assert_circ_anonymity_ok(circuit, get_options()); tor_assert(circuit->rend_data);

/* Declare the circuit dirty to avoid reuse, and for path-bias */ @@ -2871,6 +3102,7 @@ rend_service_rendezvous_has_opened(origin_circuit_t *circuit) "Done building circuit %u to rendezvous with " "cookie %s for service %s", (unsigned)circuit->base_.n_circ_id, hexcookie, serviceid); + circuit_log_path(LOG_INFO, LD_REND, circuit);

/* Clear the 'in-progress HS circ has timed out' flag for * consistency with what happens on the client side; this line has @@ -3547,7 +3779,8 @@ rend_consider_services_intro_points(void) * pick it again in the next iteration. */ smartlist_add(exclude_nodes, (void*)node); intro = tor_malloc_zero(sizeof(rend_intro_point_t)); - intro->extend_info = extend_info_from_node(node, 0); + intro->extend_info = extend_info_from_node(node, + rend_service_allow_direct_connection(options)); intro->intro_key = crypto_pk_new(); const int fail = crypto_pk_generate_key(intro->intro_key); tor_assert(!fail); @@ -3592,8 +3825,9 @@ rend_consider_services_upload(time_t now) { int i; rend_service_t *service; - int rendpostperiod = get_options()->RendPostPeriod; - int rendinitialpostdelay = (get_options()->TestingTorNetwork ? + const or_options_t *options = get_options(); + int rendpostperiod = options->RendPostPeriod; + int rendinitialpostdelay = (options->TestingTorNetwork ? MIN_REND_INITIAL_POST_DELAY_TESTING : MIN_REND_INITIAL_POST_DELAY);

@@ -3604,6 +3838,12 @@ rend_consider_services_upload(time_t now) * the descriptor is stable before being published. See comment below. */ service->next_upload_time = now + rendinitialpostdelay + crypto_rand_int(2*rendpostperiod); + /* Single Onion Services prioritise availability over hiding their + * startup time, as their IP address is publicly discoverable anyway. + */ + if (rend_service_reveal_startup_time(options)) { + service->next_upload_time = now + rendinitialpostdelay; + } } /* Does every introduction points have been established? */ unsigned int intro_points_ready = @@ -3844,11 +4084,30 @@ rend_service_set_connection_addr_port(edge_connection_t *conn, return -2; }

-/* Stub that should be replaced with the #17178 version of the function - * when merging. */ +/* Do the options allow onion services to make direct (non-anonymous) + * connections to introduction or rendezvous points? + * Returns true if tor is in OnionServiceSingleHopMode. */ int -rend_service_allow_direct_connection(const or_options_t *options) +rend_service_allow_non_anonymous_connection(const or_options_t *options) { - (void)options; - return 0; + return options->OnionServiceSingleHopMode ? 1 : 0; +} + +/* Do the options allow us to reveal the exact startup time of the onion + * service? + * Single Onion Services prioritise availability over hiding their + * startup time, as their IP address is publicly discoverable anyway. + * Returns true if tor is in OnionServiceSingleHopMode. */ +int +rend_service_reveal_startup_time(const or_options_t *options) +{ + return rend_service_allow_non_anonymous_connection(options); +} + +/* Is non-anonymous mode enabled using the OnionServiceNonAnonymousMode + * config option? */ +int +rend_service_non_anonymous_mode_enabled(const or_options_t *options) +{ + return options->OnionServiceNonAnonymousMode ? 1 : 0; } diff --git a/src/or/rendservice.h b/src/or/rendservice.h index d39d7bd..0cf448e 100644 --- a/src/or/rendservice.h +++ b/src/or/rendservice.h @@ -164,6 +164,11 @@ void rend_service_port_config_free(rend_service_port_config_t *p);

void rend_authorized_client_free(rend_authorized_client_t *client);

+int rend_service_list_verify_single_onion_poison( + const smartlist_t *service_list, + const or_options_t *options); +int rend_service_poison_new_single_onion_dirs(const smartlist_t *service_list); + /** Return value from rend_service_add_ephemeral. */ typedef enum { RSAE_BADAUTH = -5, /**< Invalid auth_type/auth_clients */ @@ -187,7 +192,9 @@ void directory_post_to_hs_dir(rend_service_descriptor_t *renddesc, const char *service_id, int seconds_valid); void rend_service_desc_has_uploaded(const rend_data_t *rend_data);

-int rend_service_allow_direct_connection(const or_options_t *options); +int rend_service_allow_non_anonymous_connection(const or_options_t *options); +int rend_service_reveal_startup_time(const or_options_t *options); +int rend_service_non_anonymous_mode_enabled(const or_options_t *options);

#endif

diff --git a/src/test/test_hs.c b/src/test/test_hs.c index 1daa155..297fb0e 100644 --- a/src/test/test_hs.c +++ b/src/test/test_hs.c @@ -8,12 +8,14 @@

#define CONTROL_PRIVATE #define CIRCUITBUILD_PRIVATE +#define RENDSERVICE_PRIVATE

#include "or.h" #include "test.h" #include "control.h" #include "config.h" #include "rendcommon.h" +#include "rendservice.h" #include "routerset.h" #include "circuitbuild.h" #include "test_helpers.h" @@ -496,6 +498,209 @@ test_hs_auth_cookies(void *arg) return; }

+static int mock_get_options_calls = 0; +static or_options_t *mock_options = NULL; + +static void +reset_options(or_options_t *options, int *get_options_calls) +{ + memset(options, 0, sizeof(or_options_t)); + options->TestingTorNetwork = 1; + + *get_options_calls = 0; +} + +static const or_options_t * +mock_get_options(void) +{ + ++mock_get_options_calls; + tor_assert(mock_options); + return mock_options; +} + +/* Test that single onion poisoning works. */ +static void +test_single_onion_poisoning(void *arg) +{ + or_options_t opt; + mock_options = &opt; + reset_options(mock_options, &mock_get_options_calls); + MOCK(get_options, mock_get_options); + + int ret = -1; + mock_options->DataDirectory = tor_strdup(get_fname("test_data_dir")); + rend_service_t *service_1 = tor_malloc_zero(sizeof(rend_service_t)); + char *dir1 = tor_strdup(get_fname("test_hs_dir1")); + rend_service_t *service_2 = tor_malloc_zero(sizeof(rend_service_t)); + char *dir2 = tor_strdup(get_fname("test_hs_dir2")); + smartlist_t *services = smartlist_new(); + + (void) arg; + + /* No services, no problem! */ + mock_options->OnionServiceSingleHopMode = 0; + mock_options->OnionServiceNonAnonymousMode = 0; + ret = rend_service_list_verify_single_onion_poison(services, mock_options); + tt_assert(ret == 0); + + /* Either way, no problem. */ + mock_options->OnionServiceSingleHopMode = 1; + mock_options->OnionServiceNonAnonymousMode = 1; + ret = rend_service_list_verify_single_onion_poison(services, mock_options); + tt_assert(ret == 0); + + /* Create directories for both services */ + +#ifdef _WIN32 + ret = mkdir(mock_options->DataDirectory); + tt_assert(ret == 0); + ret = mkdir(dir1); + tt_assert(ret == 0); + ret = mkdir(dir2); +#else + ret = mkdir(mock_options->DataDirectory, 0700); + tt_assert(ret == 0); + ret = mkdir(dir1, 0700); + tt_assert(ret == 0); + ret = mkdir(dir2, 0700); +#endif + tt_assert(ret == 0); + + service_1->directory = dir1; + service_2->directory = dir2; + smartlist_add(services, service_1); + /* But don't add the second service yet. */ + + /* Service directories, but no previous keys, no problem! */ + mock_options->OnionServiceSingleHopMode = 0; + mock_options->OnionServiceNonAnonymousMode = 0; + ret = rend_service_list_verify_single_onion_poison(services, mock_options); + tt_assert(ret == 0); + + /* Either way, no problem. */ + mock_options->OnionServiceSingleHopMode = 1; + mock_options->OnionServiceNonAnonymousMode = 1; + ret = rend_service_list_verify_single_onion_poison(services, mock_options); + tt_assert(ret == 0); + + /* Poison! Poison! Poison! + * This can only be done in OnionServiceSingleHopMode. */ + mock_options->OnionServiceSingleHopMode = 1; + mock_options->OnionServiceNonAnonymousMode = 1; + ret = rend_service_poison_new_single_onion_dirs(services); + tt_assert(ret == 0); + /* Poisoning twice is a no-op. */ + ret = rend_service_poison_new_single_onion_dirs(services); + tt_assert(ret == 0); + + /* Poisoned service directories, but no previous keys, no problem! */ + mock_options->OnionServiceSingleHopMode = 0; + mock_options->OnionServiceNonAnonymousMode = 0; + ret = rend_service_list_verify_single_onion_poison(services, mock_options); + tt_assert(ret == 0); + + /* Either way, no problem. */ + mock_options->OnionServiceSingleHopMode = 1; + mock_options->OnionServiceNonAnonymousMode = 1; + ret = rend_service_list_verify_single_onion_poison(services, mock_options); + tt_assert(ret == 0); + + /* Now add some keys, and we'll have a problem. */ + ret = rend_service_load_all_keys(services); + tt_assert(ret == 0); + + /* Poisoned service directories with previous keys are not allowed. */ + mock_options->OnionServiceSingleHopMode = 0; + mock_options->OnionServiceNonAnonymousMode = 0; + ret = rend_service_list_verify_single_onion_poison(services, mock_options); + tt_assert(ret < 0); + + /* But they are allowed if we're in non-anonymous mode. */ + mock_options->OnionServiceSingleHopMode = 1; + mock_options->OnionServiceNonAnonymousMode = 1; + ret = rend_service_list_verify_single_onion_poison(services, mock_options); + tt_assert(ret == 0); + + /* Re-poisoning directories with existing keys is a no-op, because + * directories with existing keys are ignored. */ + mock_options->OnionServiceSingleHopMode = 1; + mock_options->OnionServiceNonAnonymousMode = 1; + ret = rend_service_poison_new_single_onion_dirs(services); + tt_assert(ret == 0); + /* And it keeps the poison. */ + ret = rend_service_list_verify_single_onion_poison(services, mock_options); + tt_assert(ret == 0); + + /* Now add the second service: it has no key and no poison file */ + smartlist_add(services, service_2); + + /* A new service, and an existing poisoned service. Not ok. */ + mock_options->OnionServiceSingleHopMode = 0; + mock_options->OnionServiceNonAnonymousMode = 0; + ret = rend_service_list_verify_single_onion_poison(services, mock_options); + tt_assert(ret < 0); + + /* But ok to add in non-anonymous mode. */ + mock_options->OnionServiceSingleHopMode = 1; + mock_options->OnionServiceNonAnonymousMode = 1; + ret = rend_service_list_verify_single_onion_poison(services, mock_options); + tt_assert(ret == 0); + + /* Now remove the poisoning from the first service, and we have the opposite + * problem. */ + char *poison_path = rend_service_sos_poison_path(service_1); + ret = unlink(poison_path); + tor_free(poison_path); + tt_assert(ret == 0); + + /* Unpoisoned service directories with previous keys are ok, as are empty + * directories. */ + mock_options->OnionServiceSingleHopMode = 0; + mock_options->OnionServiceNonAnonymousMode = 0; + ret = rend_service_list_verify_single_onion_poison(services, mock_options); + tt_assert(ret == 0); + + /* But the existing unpoisoned key is not ok in non-anonymous mode, even if + * there is an empty service. */ + mock_options->OnionServiceSingleHopMode = 1; + mock_options->OnionServiceNonAnonymousMode = 1; + ret = rend_service_list_verify_single_onion_poison(services, mock_options); + tt_assert(ret < 0); + + /* Poisoning directories with existing keys is a no-op, because directories + * with existing keys are ignored. But the new directory should poison. */ + mock_options->OnionServiceSingleHopMode = 1; + mock_options->OnionServiceNonAnonymousMode = 1; + ret = rend_service_poison_new_single_onion_dirs(services); + tt_assert(ret == 0); + /* And the old directory remains unpoisoned. */ + ret = rend_service_list_verify_single_onion_poison(services, mock_options); + tt_assert(ret < 0); + + /* And the new directory should be ignored, because it has no key. */ + mock_options->OnionServiceSingleHopMode = 0; + mock_options->OnionServiceNonAnonymousMode = 0; + ret = rend_service_list_verify_single_onion_poison(services, mock_options); + tt_assert(ret == 0); + + /* Re-poisoning directories without existing keys is a no-op. */ + mock_options->OnionServiceSingleHopMode = 1; + mock_options->OnionServiceNonAnonymousMode = 1; + ret = rend_service_poison_new_single_onion_dirs(services); + tt_assert(ret == 0); + /* And the old directory remains unpoisoned. */ + ret = rend_service_list_verify_single_onion_poison(services, mock_options); + tt_assert(ret < 0); + + done: + /* TODO: should we delete the directories here? */ + rend_service_free(service_1); + rend_service_free(service_2); + smartlist_free(services); + UNMOCK(get_options); + tor_free(mock_options->DataDirectory); +} + struct testcase_t hs_tests[] = { { "hs_rend_data", test_hs_rend_data, TT_FORK, NULL, NULL }, @@ -508,6 +713,8 @@ struct testcase_t hs_tests[] = { NULL, NULL }, { "hs_auth_cookies", test_hs_auth_cookies, TT_FORK, NULL, NULL }, + { "single_onion_poisoning", test_single_onion_poisoning, TT_FORK, + NULL, NULL }, END_OF_TESTCASES };

diff --git a/src/test/test_options.c b/src/test/test_options.c index 87f8966..cd1821a 100644 --- a/src/test/test_options.c +++ b/src/test/test_options.c @@ -2758,6 +2758,154 @@ test_options_validate__rend(void *ignored) }

static void +test_options_validate__single_onion(void *ignored) +{ + (void)ignored; + int ret; + char *msg; + options_test_data_t *tdata = NULL; + int previous_log = setup_capture_of_logs(LOG_WARN); + + /* Test that OnionServiceSingleHopMode must come with + * OnionServiceNonAnonymousMode */ + tdata = get_options_test_data(TEST_OPTIONS_DEFAULT_VALUES + "SOCKSPort 0\n" + "OnionServiceSingleHopMode 1\n" + ); + ret = options_validate(tdata->old_opt, tdata->opt, tdata->def_opt, 0, &msg); + tt_int_op(ret, OP_EQ, -1); + tt_str_op(msg, OP_EQ, "OnionServiceSingleHopMode does not provide any " + "server anonymity. It must be used with " + "OnionServiceNonAnonymousMode set to 1."); + tor_free(msg); + free_options_test_data(tdata); + + tdata = get_options_test_data(TEST_OPTIONS_DEFAULT_VALUES + "SOCKSPort 0\n" + "OnionServiceSingleHopMode 1\n" + "OnionServiceNonAnonymousMode 0\n" + ); + ret = options_validate(tdata->old_opt, tdata->opt, tdata->def_opt, 0, &msg); + tt_int_op(ret, OP_EQ, -1); + tt_str_op(msg, OP_EQ, "OnionServiceSingleHopMode does not provide any " + "server anonymity. It must be used with " + "OnionServiceNonAnonymousMode set to 1."); + tor_free(msg); + free_options_test_data(tdata); + + tdata = get_options_test_data(TEST_OPTIONS_DEFAULT_VALUES + "SOCKSPort 0\n" + "OnionServiceSingleHopMode 1\n" + "OnionServiceNonAnonymousMode 1\n" + ); + ret = options_validate(tdata->old_opt, tdata->opt, tdata->def_opt, 0, &msg); + tt_int_op(ret, OP_EQ, 0); + tt_ptr_op(msg, OP_EQ, NULL); + free_options_test_data(tdata); + + /* Test that SOCKSPort must come with Tor2webMode if + * OnionServiceSingleHopMode is 1 */ + tdata = get_options_test_data(TEST_OPTIONS_DEFAULT_VALUES + "SOCKSPort 5000\n" + "OnionServiceSingleHopMode 1\n" + "OnionServiceNonAnonymousMode 1\n" + "Tor2webMode 0\n" + ); + ret = options_validate(tdata->old_opt, tdata->opt, tdata->def_opt, 0, &msg); + tt_int_op(ret, OP_EQ, -1); + tt_str_op(msg, OP_EQ, "OnionServiceSingleHopMode is incompatible with using " + "Tor as an anonymous client. Please set Socks/Trans/NATD/DNSPort " + "to 0, or OnionServiceSingleHopMode to 0, or use the " + "non-anonymous Tor2webMode."); + tor_free(msg); + free_options_test_data(tdata); + + tdata = get_options_test_data(TEST_OPTIONS_DEFAULT_VALUES + "SOCKSPort 0\n" + "OnionServiceSingleHopMode 1\n" + "OnionServiceNonAnonymousMode 1\n" + "Tor2webMode 0\n" + ); + ret = options_validate(tdata->old_opt, tdata->opt, tdata->def_opt, 0, &msg); + tt_int_op(ret, OP_EQ, 0); + tt_ptr_op(msg, OP_EQ, NULL); + free_options_test_data(tdata); + + tdata = get_options_test_data(TEST_OPTIONS_DEFAULT_VALUES + "SOCKSPort 5000\n" + "OnionServiceSingleHopMode 0\n" + "Tor2webMode 0\n" + ); + ret = options_validate(tdata->old_opt, tdata->opt, tdata->def_opt, 0, &msg); + tt_int_op(ret, OP_EQ, 0); + tt_ptr_op(msg, OP_EQ, NULL); + free_options_test_data(tdata); + + tdata = get_options_test_data(TEST_OPTIONS_DEFAULT_VALUES + "SOCKSPort 5000\n" + "OnionServiceSingleHopMode 1\n" + "OnionServiceNonAnonymousMode 1\n" + "Tor2webMode 1\n" + ); + ret = options_validate(tdata->old_opt, tdata->opt, tdata->def_opt, 0, &msg); + tt_int_op(ret, OP_EQ, 0); + tt_ptr_op(msg, OP_EQ, NULL); + free_options_test_data(tdata); + + /* Test that a hidden service can't be run with Tor2web + * Use OnionServiceNonAnonymousMode instead of Tor2webMode, because + * Tor2webMode requires a compilation #define */ + tdata = get_options_test_data(TEST_OPTIONS_DEFAULT_VALUES + "OnionServiceNonAnonymousMode 1\n" + "HiddenServiceDir /Library/Tor/var/lib/tor/hidden_service/\n" + "HiddenServicePort 80 127.0.0.1:8080\n" + ); + ret = options_validate(tdata->old_opt, tdata->opt, tdata->def_opt, 0, &msg); + tt_int_op(ret, OP_EQ, -1); + tt_str_op(msg, OP_EQ, "OnionServiceNonAnonymousMode does not provide any " + "server anonymity. It must be used with OnionServiceSingleHopMode " + "set to 1."); + tor_free(msg); + free_options_test_data(tdata); + + tdata = get_options_test_data(TEST_OPTIONS_DEFAULT_VALUES + "OnionServiceNonAnonymousMode 1\n" + ); + ret = options_validate(tdata->old_opt, tdata->opt, tdata->def_opt, 0, &msg); + tt_int_op(ret, OP_EQ, -1); + tt_str_op(msg, OP_EQ, "OnionServiceNonAnonymousMode does not provide any " + "server anonymity. It must be used with OnionServiceSingleHopMode " + "set to 1."); + free_options_test_data(tdata); + + tdata = get_options_test_data(TEST_OPTIONS_DEFAULT_VALUES + "HiddenServiceDir /Library/Tor/var/lib/tor/hidden_service/\n" + "HiddenServicePort 80 127.0.0.1:8080\n" + ); + ret = options_validate(tdata->old_opt, tdata->opt, tdata->def_opt, 0, &msg); + tt_int_op(ret, OP_EQ, 0); + tt_ptr_op(msg, OP_EQ, NULL); + free_options_test_data(tdata); + + tdata = get_options_test_data(TEST_OPTIONS_DEFAULT_VALUES + "OnionServiceNonAnonymousMode 1\n" + "HiddenServiceDir /Library/Tor/var/lib/tor/hidden_service/\n" + "HiddenServicePort 80 127.0.0.1:8080\n" + "OnionServiceSingleHopMode 1\n" + "SOCKSPort 0\n" + ); + ret = options_validate(tdata->old_opt, tdata->opt, tdata->def_opt, 0, &msg); + tt_int_op(ret, OP_EQ, 0); + tt_ptr_op(msg, OP_EQ, NULL); + + done: + policies_free_all(); + teardown_capture_of_logs(previous_log); + free_options_test_data(tdata); + tor_free(msg); +} + +static void test_options_validate__accounting(void *ignored) { (void)ignored; @@ -4379,6 +4527,7 @@ struct testcase_t options_tests[] = { LOCAL_VALIDATE_TEST(port_forwarding), LOCAL_VALIDATE_TEST(tor2web), LOCAL_VALIDATE_TEST(rend), + LOCAL_VALIDATE_TEST(single_onion), LOCAL_VALIDATE_TEST(accounting), LOCAL_VALIDATE_TEST(proxy), LOCAL_VALIDATE_TEST(control),