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[tor-commits] [tor/master] Merge branch 'maint-0.3.1' into maint-0.3.2



commit bd71e0a0c8ccf684c40201f08c456596eac60887
Merge: c67adddac 2bcd264a2
Author: Nick Mathewson <nickm@xxxxxxxxxxxxxx>
Date:   Fri Feb 16 09:54:13 2018 -0500

    Merge branch 'maint-0.3.1' into maint-0.3.2

 changes/bug24952            |   5 +
 changes/bug25223            |   4 +
 changes/ticket24902         |  13 +
 changes/ticket25122         |   4 +
 changes/ticket25202         |   4 +
 doc/tor.1.txt               |  95 ++++++
 src/common/address.c        |  27 +-
 src/common/address.h        |   2 +
 src/common/address_set.c    | 129 +++++++
 src/common/address_set.h    |  35 ++
 src/common/include.am       |   2 +
 src/common/log.c            |   2 +-
 src/common/torlog.h         |   4 +-
 src/or/channel.c            |   9 +-
 src/or/channel.h            |   3 +-
 src/or/channeltls.c         |   2 +-
 src/or/command.c            |  13 +
 src/or/config.c             |  25 ++
 src/or/connection.c         |  16 +
 src/or/dos.c                | 794 ++++++++++++++++++++++++++++++++++++++++++++
 src/or/dos.h                | 140 ++++++++
 src/or/geoip.c              | 205 ++++++++++--
 src/or/geoip.h              |  29 ++
 src/or/include.am           |   2 +
 src/or/main.c               |   2 +
 src/or/networkstatus.c      |   2 +
 src/or/nodelist.c           |  77 +++++
 src/or/nodelist.h           |   3 +
 src/or/or.h                 |  33 ++
 src/or/relay.c              |  14 +-
 src/or/rendmid.c            |  12 +
 src/or/status.c             |   2 +
 src/test/include.am         |   2 +
 src/test/test.c             |  20 ++
 src/test/test.h             |   2 +
 src/test/test_address_set.c | 174 ++++++++++
 src/test/test_dos.c         | 497 +++++++++++++++++++++++++++
 37 files changed, 2361 insertions(+), 43 deletions(-)

diff --cc src/common/address.c
index dbe129be5,e6b437e9d..c683e90aa
--- a/src/common/address.c
+++ b/src/common/address.c
@@@ -1193,11 -1194,11 +1196,11 @@@ tor_addr_hash(const tor_addr_t *addr
    case AF_INET:
      return siphash24g(&addr->addr.in_addr.s_addr, 4);
    case AF_UNSPEC:
-     return 0x4e4d5342;
+     return siphash24g(unspec_hash_input, sizeof(unspec_hash_input));
    case AF_INET6:
      return siphash24g(&addr->addr.in6_addr.s6_addr, 16);
 -  default:
      /* LCOV_EXCL_START */
 +  default:
      tor_fragile_assert();
      return 0;
      /* LCOV_EXCL_STOP */
diff --cc src/common/include.am
index cd5eea340,d12895b10..715ec0264
--- a/src/common/include.am
+++ b/src/common/include.am
@@@ -80,8 -80,8 +80,9 @@@ src_common_libor_ctime_testing_a_CFLAG
  
  LIBOR_A_SRC = \
    src/common/address.c					\
+   src/common/address_set.c				\
    src/common/backtrace.c				\
 +  src/common/buffers.c					\
    src/common/compat.c					\
    src/common/compat_threads.c				\
    src/common/compat_time.c				\
@@@ -148,9 -147,8 +149,10 @@@ src_common_libor_event_testing_a_CFLAG
  
  COMMONHEADERS = \
    src/common/address.h				\
+   src/common/address_set.h			\
    src/common/backtrace.h			\
 +  src/common/buffers.h				\
 +  src/common/buffers_tls.h			\
    src/common/aes.h				\
    src/common/ciphers.inc			\
    src/common/compat.h				\
diff --cc src/or/connection.c
index d2cf4fb41,fc0646b88..ed8de05d7
--- a/src/or/connection.c
+++ b/src/or/connection.c
@@@ -704,7 -696,14 +705,14 @@@ connection_free,(connection_t *conn)
      connection_ap_warn_and_unmark_if_pending_circ(TO_ENTRY_CONN(conn),
                                                    "connection_free");
    }
 -#endif
 +#endif /* 1 */
+ 
+   /* Notify the circuit creation DoS mitigation subsystem that an OR client
+    * connection has been closed. And only do that if we track it. */
+   if (conn->type == CONN_TYPE_OR) {
+     dos_close_client_conn(TO_OR_CONN(conn));
+   }
+ 
    connection_unregister_events(conn);
    connection_free_(conn);
  }
diff --cc src/or/geoip.h
index acf61b97a,773525ccf..753bdbf82
--- a/src/or/geoip.h
+++ b/src/or/geoip.h
@@@ -19,7 -20,30 +20,30 @@@ STATIC int geoip_parse_entry(const cha
  STATIC int geoip_get_country_by_ipv4(uint32_t ipaddr);
  STATIC int geoip_get_country_by_ipv6(const struct in6_addr *addr);
  STATIC void clear_geoip_db(void);
 -#endif
 +#endif /* defined(GEOIP_PRIVATE) */
+ 
+ /** Entry in a map from IP address to the last time we've seen an incoming
+  * connection from that IP address. Used by bridges only to track which
+  * countries have them blocked, or the DoS mitigation subsystem if enabled. */
+ typedef struct clientmap_entry_t {
+   HT_ENTRY(clientmap_entry_t) node;
+   tor_addr_t addr;
+   /* Name of pluggable transport used by this client. NULL if no
+      pluggable transport was used. */
+   char *transport_name;
+ 
+   /** Time when we last saw this IP address, in MINUTES since the epoch.
+    *
+    * (This will run out of space around 4011 CE.  If Tor is still in use around
+    * 4000 CE, please remember to add more bits to last_seen_in_minutes.) */
+   unsigned int last_seen_in_minutes:30;
+   unsigned int action:2;
+ 
+   /* This object is used to keep some statistics per client address for the
+    * DoS mitigation subsystem. */
+   dos_client_stats_t dos_stats;
+ } clientmap_entry_t;
+ 
  int should_record_bridge_info(const or_options_t *options);
  int geoip_load_file(sa_family_t family, const char *filename);
  MOCK_DECL(int, geoip_get_country_by_addr, (const tor_addr_t *addr));
diff --cc src/or/include.am
index 7216aba9a,5d5ff5c41..abf62c2e8
--- a/src/or/include.am
+++ b/src/or/include.am
@@@ -47,8 -48,13 +47,9 @@@ LIBTOR_A_SOURCES = 
  	src/or/dirvote.c				\
  	src/or/dns.c					\
  	src/or/dnsserv.c				\
+ 	src/or/dos.c					\
  	src/or/fp_pair.c				\
  	src/or/geoip.c					\
 -	src/or/hs_intropoint.c          \
 -	src/or/hs_circuitmap.c          \
 -	src/or/hs_ntor.c                \
 -	src/or/hs_service.c             \
  	src/or/entrynodes.c				\
  	src/or/ext_orport.c				\
  	src/or/hibernate.c				\
diff --cc src/or/main.c
index c340e4128,197dfd430..036ef1efd
--- a/src/or/main.c
+++ b/src/or/main.c
@@@ -3268,7 -3242,7 +3269,8 @@@ tor_free_all(int postfork
    protover_free_all();
    bridges_free_all();
    consdiffmgr_free_all();
 +  hs_free_all();
+   dos_free_all();
    if (!postfork) {
      config_free_all();
      or_state_free_all();
diff --cc src/or/networkstatus.c
index 9d9a2b8ad,e59069e84..dd82f6681
--- a/src/or/networkstatus.c
+++ b/src/or/networkstatus.c
@@@ -1564,22 -1604,15 +1565,23 @@@ notify_control_networkstatus_changed(co
    smartlist_free(changed);
  }
  
 -/* Called when the consensus has changed from old_c to new_c. */
 +/* Called before the consensus changes from old_c to new_c. */
  static void
 -notify_networkstatus_changed(const networkstatus_t *old_c,
 -                             const networkstatus_t *new_c)
 +notify_before_networkstatus_changes(const networkstatus_t *old_c,
 +                                    const networkstatus_t *new_c)
  {
    notify_control_networkstatus_changed(old_c, new_c);
+   dos_consensus_has_changed(new_c);
  }
  
 +/* Called after a new consensus has been put in the global state. It is safe
 + * to use the consensus getters in this function. */
 +static void
 +notify_after_networkstatus_changes(void)
 +{
 +  scheduler_notify_networkstatus_changed();
 +}
 +
  /** Copy all the ancillary information (like router download status and so on)
   * from <b>old_c</b> to <b>new_c</b>. */
  static void
diff --cc src/or/nodelist.c
index f2e979be8,c754ebdb6..9a477ecf4
--- a/src/or/nodelist.c
+++ b/src/or/nodelist.c
@@@ -38,10 -38,9 +38,11 @@@
   * used for authorities and fallback directories.)
   */
  
 +#define NODELIST_PRIVATE
 +
  #include "or.h"
  #include "address.h"
+ #include "address_set.h"
  #include "config.h"
  #include "control.h"
  #include "dirserv.h"
@@@ -95,14 -92,9 +97,16 @@@ typedef struct nodelist_t 
    smartlist_t *nodes;
    /* Hash table to map from node ID digest to node. */
    HT_HEAD(nodelist_map, node_t) nodes_by_id;
 -
 +  /* Hash table to map from node Ed25519 ID to node.
 +   *
 +   * Whenever a node's routerinfo or microdescriptor is about to change,
 +   * you should remove it from this map with node_remove_from_ed25519_map().
 +   * Whenever a node's routerinfo or microdescriptor has just chaned,
 +   * you should add it to this map with node_add_to_ed25519_map().
 +   */
 +  HT_HEAD(nodelist_ed_map, node_t) nodes_by_ed_id;
+   /* Set of addresses that belong to nodes we believe in. */
+   address_set_t *node_addrs;
  } nodelist_t;
  
  static inline unsigned int
@@@ -442,14 -264,8 +490,16 @@@ nodelist_set_routerinfo(routerinfo_t *r
      dirserv_set_node_flags_from_authoritative_status(node, status);
    }
  
 +  /* Setting the HSDir index requires the ed25519 identity key which can
 +   * only be found either in the ri or md. This is why this is called here.
 +   * Only nodes supporting HSDir=2 protocol version needs this index. */
 +  if (node->rs && node->rs->supports_v3_hsdir) {
 +    node_set_hsdir_index(node,
 +                         networkstatus_get_latest_consensus());
 +  }
 +
+   node_add_to_address_set(node);
+ 
    return node;
  }
  
@@@ -476,21 -292,14 +526,23 @@@ nodelist_add_microdesc(microdesc_t *md
      return NULL;
    node = node_get_mutable_by_id(rs->identity_digest);
    if (node) {
 +    node_remove_from_ed25519_map(node);
      if (node->md)
        node->md->held_by_nodes--;
 +
      node->md = md;
      md->held_by_nodes++;
 +    /* Setting the HSDir index requires the ed25519 identity key which can
 +     * only be found either in the ri or md. This is why this is called here.
 +     * Only nodes supporting HSDir=2 protocol version needs this index. */
 +    if (rs->supports_v3_hsdir) {
 +      node_set_hsdir_index(node, ns);
 +    }
 +    node_add_to_ed25519_map(node);
    }
  
+   node_add_to_address_set(node);
+ 
    return node;
  }
  
diff --cc src/or/nodelist.h
index 754990ac8,9cd66f60a..8a0c79f86
--- a/src/or/nodelist.h
+++ b/src/or/nodelist.h
@@@ -142,16 -132,7 +143,18 @@@ void router_dir_info_changed(void)
  const char *get_dir_info_status_string(void);
  int count_loading_descriptors_progress(void);
  
 +#ifdef NODELIST_PRIVATE
 +
 +#ifdef TOR_UNIT_TESTS
 +
 +STATIC void
 +node_set_hsdir_index(node_t *node, const networkstatus_t *ns);
 +
 +#endif /* defined(TOR_UNIT_TESTS) */
 +
 +#endif /* defined(NODELIST_PRIVATE) */
 +
+ MOCK_DECL(int, get_estimated_address_per_node, (void));
+ 
 -#endif
 +#endif /* !defined(TOR_NODELIST_H) */
  
diff --cc src/or/or.h
index 03e20b80d,9e7833386..5128fd219
--- a/src/or/or.h
+++ b/src/or/or.h
@@@ -4624,28 -4583,36 +4628,57 @@@ typedef struct 
     * use the default. */
    int MaxConsensusAgeForDiffs;
  
 +  /** Bool (default: 0). Tells Tor to never try to exec another program.
 +   */
 +  int NoExec;
 +
 +  /** Have the KIST scheduler run every X milliseconds. If less than zero, do
 +   * not use the KIST scheduler but use the old vanilla scheduler instead. If
 +   * zero, do what the consensus says and fall back to using KIST as if this is
 +   * set to "10 msec" if the consensus doesn't say anything. */
 +  int KISTSchedRunInterval;
 +
 +  /** A multiplier for the KIST per-socket limit calculation. */
 +  double KISTSockBufSizeFactor;
 +
 +  /** The list of scheduler type string ordered by priority that is first one
 +   * has to be tried first. Default: KIST,KISTLite,Vanilla */
 +  smartlist_t *Schedulers;
 +  /* An ordered list of scheduler_types mapped from Schedulers. */
 +  smartlist_t *SchedulerTypes_;
++
+   /** Autobool: Is the circuit creation DoS mitigation subsystem enabled? */
+   int DoSCircuitCreationEnabled;
+   /** Minimum concurrent connection needed from one single address before any
+    * defense is used. */
+   int DoSCircuitCreationMinConnections;
+   /** Circuit rate used to refill the token bucket. */
+   int DoSCircuitCreationRate;
+   /** Maximum allowed burst of circuits. Reaching that value, the address is
+    * detected as malicious and a defense might be used. */
+   int DoSCircuitCreationBurst;
+   /** When an address is marked as malicous, what defense should be used
+    * against it. See the dos_cc_defense_type_t enum. */
+   int DoSCircuitCreationDefenseType;
+   /** For how much time (in seconds) the defense is applicable for a malicious
+    * address. A random time delta is added to the defense time of an address
+    * which will be between 1 second and half of this value. */
+   int DoSCircuitCreationDefenseTimePeriod;
+ 
+   /** Autobool: Is the DoS connection mitigation subsystem enabled? */
+   int DoSConnectionEnabled;
+   /** Maximum concurrent connection allowed per address. */
+   int DoSConnectionMaxConcurrentCount;
+   /** When an address is reaches the maximum count, what defense should be
+    * used against it. See the dos_conn_defense_type_t enum. */
+   int DoSConnectionDefenseType;
+ 
+   /** Autobool: Do we refuse single hop client rendezvous? */
+   int DoSRefuseSingleHopClientRendezvous;
  } or_options_t;
  
 +#define LOG_PROTOCOL_WARN (get_protocol_warning_severity_level())
 +
  /** Persistent state for an onion router, as saved to disk. */
  typedef struct {
    uint32_t magic_;



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