Commit 9d0fab98 authored by Nick Mathewson's avatar Nick Mathewson 🤹
Browse files

Allow MapAddress and Automap to work together 

The trick here is to apply mapaddress first, and only then apply
automapping.  Otherwise, the automap checks don't get done.

Fix for bug 7555; bugfix on all versions of Tor supporting both
MapAddress and AutoMap.
parent ab6bd78e

changes/bug7555

0 → 100644
+5 −0
Original line number Diff line number Diff line 
  o Major bugfixes (client):

    - Allow MapAddress and AutomapHostsOnResolve to work together when an

      address is mapped into another address type that must be

      automapped at resolve time.  Fixes bug 7555; bugfix on

      0.2.0.1-alpha.

src/or/addressmap.c

+29 −7
Original line number Diff line number Diff line
@@ -390,7 +390,9 @@ addressmap_rewrite(char *address, size_t maxlen, 
      goto done;

    }



    if (ent && ent->source == ADDRMAPSRC_DNS) {

    switch (ent->source) {

      case ADDRMAPSRC_DNS:

        {

          sa_family_t f;

          tor_addr_t tmp;

          f = tor_addr_parse(&tmp, ent->new_address);
@@ -399,6 +401,26 @@ addressmap_rewrite(char *address, size_t maxlen, 
          else if (f == AF_INET6 && !(flags & AMR_FLAG_USE_IPV6_DNS))

            goto done;

        }

        break;

      case ADDRMAPSRC_CONTROLLER:

      case ADDRMAPSRC_TORRC:

        if (!(flags & AMR_FLAG_USE_MAPADDRESS))

          goto done;

        break;

      case ADDRMAPSRC_AUTOMAP:

        if (!(flags & AMR_FLAG_USE_AUTOMAP))

          goto done;

        break;

      case ADDRMAPSRC_TRACKEXIT:

        if (!(flags & AMR_FLAG_USE_TRACKEXIT))

          goto done;

        break;

      case ADDRMAPSRC_NONE:

      default:

        log_warn(LD_BUG, "Unknown addrmap source value %d. Ignoring it.",

                 (int) ent->source);

        goto done;

    }



    if (ent->dst_wildcard && !exact_match) {

      strlcat(address, ".", maxlen);

src/or/addressmap.h

+5 −2
Original line number Diff line number Diff line
@@ -18,6 +18,9 @@ void addressmap_clear_transient(void); 
void addressmap_free_all(void);

#define AMR_FLAG_USE_IPV4_DNS   (1u<<0)

#define AMR_FLAG_USE_IPV6_DNS   (1u<<1)

#define AMR_FLAG_USE_MAPADDRESS (1u<<2)

#define AMR_FLAG_USE_AUTOMAP    (1u<<3)

#define AMR_FLAG_USE_TRACKEXIT  (1u<<4)

int addressmap_rewrite(char *address, size_t maxlen, unsigned flags,

                       time_t *expires_out,

                       addressmap_entry_source_t *exit_source_out);

src/or/connection_edge.c

+15 −2
Original line number Diff line number Diff line
@@ -946,6 +946,15 @@ connection_ap_handshake_rewrite(entry_connection_t *conn, 
  if (! conn->original_dest_address)

    conn->original_dest_address = tor_strdup(conn->socks_request->address);



  if (socks->command != SOCKS_COMMAND_RESOLVE_PTR) {

    const unsigned rewrite_flags = AMR_FLAG_USE_MAPADDRESS;

    if (addressmap_rewrite(socks->address, sizeof(socks->address),

                       rewrite_flags, &out->map_expires, &out->exit_source)) {

      control_event_stream_status(conn, STREAM_EVENT_REMAP,

                                  REMAP_STREAM_SOURCE_CACHE);

    }

  }



  if (socks->command == SOCKS_COMMAND_RESOLVE &&

      tor_addr_parse(&addr_tmp, socks->address)<0 &&

      options->AutomapHostsOnResolve) {
@@ -1014,16 +1023,20 @@ connection_ap_handshake_rewrite(entry_connection_t *conn, 
    }

  } else if (!out->automap) {

    /* For address map controls, remap the address. */

    unsigned rewrite_flags = 0;

    unsigned rewrite_flags = AMR_FLAG_USE_AUTOMAP | AMR_FLAG_USE_TRACKEXIT;

    addressmap_entry_source_t exit_source2;

    if (conn->use_cached_ipv4_answers)

      rewrite_flags |= AMR_FLAG_USE_IPV4_DNS;

    if (conn->use_cached_ipv6_answers)

      rewrite_flags |= AMR_FLAG_USE_IPV6_DNS;

    if (addressmap_rewrite(socks->address, sizeof(socks->address),

                           rewrite_flags, &out->map_expires, &out->exit_source)) {

                        rewrite_flags, &out->map_expires, &exit_source2)) {

      control_event_stream_status(conn, STREAM_EVENT_REMAP,

                                  REMAP_STREAM_SOURCE_CACHE);

    }

    if (out->exit_source == ADDRMAPSRC_NONE) {

      out->exit_source = exit_source2;

    }

  }



  if (!out->automap && address_is_in_virtual_range(socks->address)) {

src/test/test_config.c

+1 −2
Original line number Diff line number Diff line
@@ -51,8 +51,7 @@ test_config_addressmap(void *arg) 


/* Use old interface for now, so we don't need to rewrite the unit tests */

#define addressmap_rewrite(a,s,eo,ao)                                   \

  addressmap_rewrite((a),(s),AMR_FLAG_USE_IPV4_DNS|AMR_FLAG_USE_IPV6_DNS, \

                     (eo),(ao))

  addressmap_rewrite((a),(s), ~0, (eo),(ao))



  /* MapAddress .invalidwildcard.com .torserver.exit  - no match */

  strlcpy(address, "www.invalidwildcard.com", sizeof(address));