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@@ -10,6 +10,7 @@
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**/
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#include "or.h"
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+#include "addressmap.h"
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#include "buffers.h"
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#include "channel.h"
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#include "circuitlist.h"
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@@ -56,9 +57,7 @@
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static int connection_ap_handshake_process_socks(entry_connection_t *conn);
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static int connection_ap_process_natd(entry_connection_t *conn);
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static int connection_exit_connect_dir(edge_connection_t *exitconn);
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-static int address_is_in_virtual_range(const char *addr);
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static int consider_plaintext_ports(entry_connection_t *conn, uint16_t port);
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-static void clear_trackexithost_mappings(const char *exitname);
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static int connection_ap_supports_optimistic_data(const entry_connection_t *);
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/** An AP stream has failed/finished. If it hasn't already sent back
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@@ -784,947 +783,6 @@ connection_ap_detach_retriable(entry_connection_t *conn,
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}
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}
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-/** A client-side struct to remember requests to rewrite addresses
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- * to new addresses. These structs are stored in the hash table
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- * "addressmap" below.
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- *
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- * There are 5 ways to set an address mapping:
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- * - A MapAddress command from the controller [permanent]
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- * - An AddressMap directive in the torrc [permanent]
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- * - When a TrackHostExits torrc directive is triggered [temporary]
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- * - When a DNS resolve succeeds [temporary]
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- * - When a DNS resolve fails [temporary]
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- *
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- * When an addressmap request is made but one is already registered,
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- * the new one is replaced only if the currently registered one has
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- * no "new_address" (that is, it's in the process of DNS resolve),
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- * or if the new one is permanent (expires==0 or 1).
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- *
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- * (We overload the 'expires' field, using "0" for mappings set via
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- * the configuration file, "1" for mappings set from the control
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- * interface, and other values for DNS and TrackHostExit mappings that can
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- * expire.)
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- *
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- * A mapping may be 'wildcarded'. If "src_wildcard" is true, then
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- * any address that ends with a . followed by the key for this entry will
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- * get remapped by it. If "dst_wildcard" is also true, then only the
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- * matching suffix of such addresses will get replaced by new_address.
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- */
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-typedef struct {
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- char *new_address;
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- time_t expires;
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- addressmap_entry_source_t source:3;
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- unsigned src_wildcard:1;
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- unsigned dst_wildcard:1;
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- short num_resolve_failures;
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-} addressmap_entry_t;
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-
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-/** Entry for mapping addresses to which virtual address we mapped them to. */
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-typedef struct {
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- char *ipv4_address;
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- char *hostname_address;
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-} virtaddress_entry_t;
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-
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-/** A hash table to store client-side address rewrite instructions. */
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-static strmap_t *addressmap=NULL;
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-/**
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- * Table mapping addresses to which virtual address, if any, we
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- * assigned them to.
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- *
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- * We maintain the following invariant: if [A,B] is in
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- * virtaddress_reversemap, then B must be a virtual address, and [A,B]
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- * must be in addressmap. We do not require that the converse hold:
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- * if it fails, then we could end up mapping two virtual addresses to
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- * the same address, which is no disaster.
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- **/
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-static strmap_t *virtaddress_reversemap=NULL;
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-
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-/** Initialize addressmap. */
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-void
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-addressmap_init(void)
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-{
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- addressmap = strmap_new();
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- virtaddress_reversemap = strmap_new();
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-}
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-
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-/** Free the memory associated with the addressmap entry <b>_ent</b>. */
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-static void
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-addressmap_ent_free(void *_ent)
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-{
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- addressmap_entry_t *ent;
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- if (!_ent)
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- return;
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-
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- ent = _ent;
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- tor_free(ent->new_address);
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- tor_free(ent);
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-}
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-
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-/** Free storage held by a virtaddress_entry_t* entry in <b>ent</b>. */
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-static void
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-addressmap_virtaddress_ent_free(void *_ent)
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-{
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- virtaddress_entry_t *ent;
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- if (!_ent)
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- return;
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-
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- ent = _ent;
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- tor_free(ent->ipv4_address);
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- tor_free(ent->hostname_address);
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- tor_free(ent);
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-}
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-
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-/** Free storage held by a virtaddress_entry_t* entry in <b>ent</b>. */
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-static void
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-addressmap_virtaddress_remove(const char *address, addressmap_entry_t *ent)
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-{
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- if (ent && ent->new_address &&
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- address_is_in_virtual_range(ent->new_address)) {
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- virtaddress_entry_t *ve =
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- strmap_get(virtaddress_reversemap, ent->new_address);
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- /*log_fn(LOG_NOTICE,"remove reverse mapping for %s",ent->new_address);*/
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- if (ve) {
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- if (!strcmp(address, ve->ipv4_address))
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- tor_free(ve->ipv4_address);
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- if (!strcmp(address, ve->hostname_address))
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- tor_free(ve->hostname_address);
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- if (!ve->ipv4_address && !ve->hostname_address) {
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- tor_free(ve);
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- strmap_remove(virtaddress_reversemap, ent->new_address);
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- }
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- }
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- }
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-}
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-
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-/** Remove <b>ent</b> (which must be mapped to by <b>address</b>) from the
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- * client address maps. */
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-static void
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-addressmap_ent_remove(const char *address, addressmap_entry_t *ent)
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-{
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- addressmap_virtaddress_remove(address, ent);
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- addressmap_ent_free(ent);
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-}
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-
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-/** Unregister all TrackHostExits mappings from any address to
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- * *.exitname.exit. */
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-static void
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-clear_trackexithost_mappings(const char *exitname)
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-{
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- char *suffix = NULL;
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- if (!addressmap || !exitname)
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- return;
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- tor_asprintf(&suffix, ".%s.exit", exitname);
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- tor_strlower(suffix);
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-
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- STRMAP_FOREACH_MODIFY(addressmap, address, addressmap_entry_t *, ent) {
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- if (ent->source == ADDRMAPSRC_TRACKEXIT &&
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- !strcmpend(ent->new_address, suffix)) {
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- addressmap_ent_remove(address, ent);
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- MAP_DEL_CURRENT(address);
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- }
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- } STRMAP_FOREACH_END;
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-
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- tor_free(suffix);
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-}
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-
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-/** Remove all TRACKEXIT mappings from the addressmap for which the target
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- * host is unknown or no longer allowed, or for which the source address
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- * is no longer in trackexithosts. */
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-void
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-addressmap_clear_excluded_trackexithosts(const or_options_t *options)
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-{
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- const routerset_t *allow_nodes = options->ExitNodes;
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- const routerset_t *exclude_nodes = options->ExcludeExitNodesUnion_;
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-
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- if (!addressmap)
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- return;
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- if (routerset_is_empty(allow_nodes))
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- allow_nodes = NULL;
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- if (allow_nodes == NULL && routerset_is_empty(exclude_nodes))
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- return;
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-
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- STRMAP_FOREACH_MODIFY(addressmap, address, addressmap_entry_t *, ent) {
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- size_t len;
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- const char *target = ent->new_address, *dot;
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- char *nodename;
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- const node_t *node;
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-
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- if (!target) {
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- /* DNS resolving in progress */
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- continue;
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- } else if (strcmpend(target, ".exit")) {
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- /* Not a .exit mapping */
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- continue;
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- } else if (ent->source != ADDRMAPSRC_TRACKEXIT) {
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- /* Not a trackexit mapping. */
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- continue;
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- }
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- len = strlen(target);
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- if (len < 6)
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- continue; /* malformed. */
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- dot = target + len - 6; /* dot now points to just before .exit */
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- while (dot > target && *dot != '.')
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- dot--;
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- if (*dot == '.') dot++;
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- nodename = tor_strndup(dot, len-5-(dot-target));;
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- node = node_get_by_nickname(nodename, 0);
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- tor_free(nodename);
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- if (!node ||
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- (allow_nodes && !routerset_contains_node(allow_nodes, node)) ||
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- routerset_contains_node(exclude_nodes, node) ||
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- !hostname_in_track_host_exits(options, address)) {
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- /* We don't know this one, or we want to be rid of it. */
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- addressmap_ent_remove(address, ent);
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- MAP_DEL_CURRENT(address);
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- }
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- } STRMAP_FOREACH_END;
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-}
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-
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-/** Remove all AUTOMAP mappings from the addressmap for which the
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- * source address no longer matches AutomapHostsSuffixes, which is
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- * no longer allowed by AutomapHostsOnResolve, or for which the
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- * target address is no longer in the virtual network. */
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-void
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-addressmap_clear_invalid_automaps(const or_options_t *options)
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-{
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- int clear_all = !options->AutomapHostsOnResolve;
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- const smartlist_t *suffixes = options->AutomapHostsSuffixes;
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-
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- if (!addressmap)
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- return;
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-
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- if (!suffixes)
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- clear_all = 1; /* This should be impossible, but let's be sure. */
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-
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- STRMAP_FOREACH_MODIFY(addressmap, src_address, addressmap_entry_t *, ent) {
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- int remove = clear_all;
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- if (ent->source != ADDRMAPSRC_AUTOMAP)
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- continue; /* not an automap mapping. */
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-
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- if (!remove) {
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- int suffix_found = 0;
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- SMARTLIST_FOREACH(suffixes, const char *, suffix, {
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- if (!strcasecmpend(src_address, suffix)) {
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- suffix_found = 1;
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- break;
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- }
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- });
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- if (!suffix_found)
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- remove = 1;
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- }
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-
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- if (!remove && ! address_is_in_virtual_range(ent->new_address))
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- remove = 1;
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-
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- if (remove) {
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- addressmap_ent_remove(src_address, ent);
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- MAP_DEL_CURRENT(src_address);
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- }
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- } STRMAP_FOREACH_END;
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-}
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-
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-/** Remove all entries from the addressmap that were set via the
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- * configuration file or the command line. */
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-void
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-addressmap_clear_configured(void)
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-{
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- addressmap_get_mappings(NULL, 0, 0, 0);
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-}
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-
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-/** Remove all entries from the addressmap that are set to expire, ever. */
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-void
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-addressmap_clear_transient(void)
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-{
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- addressmap_get_mappings(NULL, 2, TIME_MAX, 0);
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-}
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-
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-/** Clean out entries from the addressmap cache that were
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- * added long enough ago that they are no longer valid.
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- */
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-void
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-addressmap_clean(time_t now)
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-{
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- addressmap_get_mappings(NULL, 2, now, 0);
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-}
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-
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-/** Free all the elements in the addressmap, and free the addressmap
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- * itself. */
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-void
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-addressmap_free_all(void)
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-{
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- strmap_free(addressmap, addressmap_ent_free);
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- addressmap = NULL;
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-
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- strmap_free(virtaddress_reversemap, addressmap_virtaddress_ent_free);
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- virtaddress_reversemap = NULL;
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-}
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-
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-/** Try to find a match for AddressMap expressions that use
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- * wildcard notation such as '*.c.d *.e.f' (so 'a.c.d' will map to 'a.e.f') or
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- * '*.c.d a.b.c' (so 'a.c.d' will map to a.b.c).
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- * Return the matching entry in AddressMap or NULL if no match is found.
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- * For expressions such as '*.c.d *.e.f', truncate <b>address</b> 'a.c.d'
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- * to 'a' before we return the matching AddressMap entry.
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- *
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- * This function does not handle the case where a pattern of the form "*.c.d"
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- * matches the address c.d -- that's done by the main addressmap_rewrite
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- * function.
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- */
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-static addressmap_entry_t *
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-addressmap_match_superdomains(char *address)
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-{
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- addressmap_entry_t *val;
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- char *cp;
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-
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- cp = address;
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- while ((cp = strchr(cp, '.'))) {
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- /* cp now points to a suffix of address that begins with a . */
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- val = strmap_get_lc(addressmap, cp+1);
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- if (val && val->src_wildcard) {
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- if (val->dst_wildcard)
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- *cp = '\0';
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- return val;
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- }
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- ++cp;
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- }
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- return NULL;
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-}
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-
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-/** Look at address, and rewrite it until it doesn't want any
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- * more rewrites; but don't get into an infinite loop.
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- * Don't write more than maxlen chars into address. Return true if the
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- * address changed; false otherwise. Set *<b>expires_out</b> to the
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- * expiry time of the result, or to <b>time_max</b> if the result does
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- * not expire.
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- *
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- * If <b>exit_source_out</b> is non-null, we set it as follows. If we the
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- * address starts out as a non-exit address, and we remap it to an .exit
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- * address at any point, then set *<b>exit_source_out</b> to the
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- * address_entry_source_t of the first such rule. Set *<b>exit_source_out</b>
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- * to ADDRMAPSRC_NONE if there is no such rewrite, or if the original address
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- * was a .exit.
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- */
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-int
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-addressmap_rewrite(char *address, size_t maxlen, time_t *expires_out,
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- addressmap_entry_source_t *exit_source_out)
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-{
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- addressmap_entry_t *ent;
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- int rewrites;
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- time_t expires = TIME_MAX;
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- addressmap_entry_source_t exit_source = ADDRMAPSRC_NONE;
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- char *addr_orig = tor_strdup(address);
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- char *log_addr_orig = NULL;
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-
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- for (rewrites = 0; rewrites < 16; rewrites++) {
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- int exact_match = 0;
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- log_addr_orig = tor_strdup(escaped_safe_str_client(address));
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-
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- ent = strmap_get(addressmap, address);
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-
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- if (!ent || !ent->new_address) {
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- ent = addressmap_match_superdomains(address);
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- } else {
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- if (ent->src_wildcard && !ent->dst_wildcard &&
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- !strcasecmp(address, ent->new_address)) {
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- /* This is a rule like *.example.com example.com, and we just got
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- * "example.com" */
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- goto done;
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- }
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-
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- exact_match = 1;
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- }
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-
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- if (!ent || !ent->new_address) {
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- goto done;
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- }
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-
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- if (ent->dst_wildcard && !exact_match) {
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- strlcat(address, ".", maxlen);
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- strlcat(address, ent->new_address, maxlen);
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- } else {
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- strlcpy(address, ent->new_address, maxlen);
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- }
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-
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- if (!strcmpend(address, ".exit") &&
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- strcmpend(addr_orig, ".exit") &&
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- exit_source == ADDRMAPSRC_NONE) {
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- exit_source = ent->source;
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- }
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-
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- log_info(LD_APP, "Addressmap: rewriting %s to %s",
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- log_addr_orig, escaped_safe_str_client(address));
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- if (ent->expires > 1 && ent->expires < expires)
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- expires = ent->expires;
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-
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- tor_free(log_addr_orig);
|
|
|
- }
|
|
|
- log_warn(LD_CONFIG,
|
|
|
- "Loop detected: we've rewritten %s 16 times! Using it as-is.",
|
|
|
- escaped_safe_str_client(address));
|
|
|
- /* it's fine to rewrite a rewrite, but don't loop forever */
|
|
|
-
|
|
|
- done:
|
|
|
- tor_free(addr_orig);
|
|
|
- tor_free(log_addr_orig);
|
|
|
- if (exit_source_out)
|
|
|
- *exit_source_out = exit_source;
|
|
|
- if (expires_out)
|
|
|
- *expires_out = TIME_MAX;
|
|
|
- return (rewrites > 0);
|
|
|
-}
|
|
|
-
|
|
|
-/** If we have a cached reverse DNS entry for the address stored in the
|
|
|
- * <b>maxlen</b>-byte buffer <b>address</b> (typically, a dotted quad) then
|
|
|
- * rewrite to the cached value and return 1. Otherwise return 0. Set
|
|
|
- * *<b>expires_out</b> to the expiry time of the result, or to <b>time_max</b>
|
|
|
- * if the result does not expire. */
|
|
|
-static int
|
|
|
-addressmap_rewrite_reverse(char *address, size_t maxlen, time_t *expires_out)
|
|
|
-{
|
|
|
- char *s, *cp;
|
|
|
- addressmap_entry_t *ent;
|
|
|
- int r = 0;
|
|
|
- tor_asprintf(&s, "REVERSE[%s]", address);
|
|
|
- ent = strmap_get(addressmap, s);
|
|
|
- if (ent) {
|
|
|
- cp = tor_strdup(escaped_safe_str_client(ent->new_address));
|
|
|
- log_info(LD_APP, "Rewrote reverse lookup %s -> %s",
|
|
|
- escaped_safe_str_client(s), cp);
|
|
|
- tor_free(cp);
|
|
|
- strlcpy(address, ent->new_address, maxlen);
|
|
|
- r = 1;
|
|
|
- }
|
|
|
-
|
|
|
- if (expires_out)
|
|
|
- *expires_out = (ent && ent->expires > 1) ? ent->expires : TIME_MAX;
|
|
|
-
|
|
|
- tor_free(s);
|
|
|
- return r;
|
|
|
-}
|
|
|
-
|
|
|
-/** Return 1 if <b>address</b> is already registered, else return 0. If address
|
|
|
- * is already registered, and <b>update_expires</b> is non-zero, then update
|
|
|
- * the expiry time on the mapping with update_expires if it is a
|
|
|
- * mapping created by TrackHostExits. */
|
|
|
-int
|
|
|
-addressmap_have_mapping(const char *address, int update_expiry)
|
|
|
-{
|
|
|
- addressmap_entry_t *ent;
|
|
|
- if (!(ent=strmap_get_lc(addressmap, address)))
|
|
|
- return 0;
|
|
|
- if (update_expiry && ent->source==ADDRMAPSRC_TRACKEXIT)
|
|
|
- ent->expires=time(NULL) + update_expiry;
|
|
|
- return 1;
|
|
|
-}
|
|
|
-
|
|
|
-/** Register a request to map <b>address</b> to <b>new_address</b>,
|
|
|
- * which will expire on <b>expires</b> (or 0 if never expires from
|
|
|
- * config file, 1 if never expires from controller, 2 if never expires
|
|
|
- * (virtual address mapping) from the controller.)
|
|
|
- *
|
|
|
- * <b>new_address</b> should be a newly dup'ed string, which we'll use or
|
|
|
- * free as appropriate. We will leave address alone.
|
|
|
- *
|
|
|
- * If <b>wildcard_addr</b> is true, then the mapping will match any address
|
|
|
- * equal to <b>address</b>, or any address ending with a period followed by
|
|
|
- * <b>address</b>. If <b>wildcard_addr</b> and <b>wildcard_new_addr</b> are
|
|
|
- * both true, the mapping will rewrite addresses that end with
|
|
|
- * ".<b>address</b>" into ones that end with ".<b>new_address</b>."
|
|
|
- *
|
|
|
- * If <b>new_address</b> is NULL, or <b>new_address</b> is equal to
|
|
|
- * <b>address</b> and <b>wildcard_addr</b> is equal to
|
|
|
- * <b>wildcard_new_addr</b>, remove any mappings that exist from
|
|
|
- * <b>address</b>.
|
|
|
- *
|
|
|
- *
|
|
|
- * It is an error to set <b>wildcard_new_addr</b> if <b>wildcard_addr</b> is
|
|
|
- * not set. */
|
|
|
-void
|
|
|
-addressmap_register(const char *address, char *new_address, time_t expires,
|
|
|
- addressmap_entry_source_t source,
|
|
|
- const int wildcard_addr,
|
|
|
- const int wildcard_new_addr)
|
|
|
-{
|
|
|
- addressmap_entry_t *ent;
|
|
|
-
|
|
|
- if (wildcard_new_addr)
|
|
|
- tor_assert(wildcard_addr);
|
|
|
-
|
|
|
- ent = strmap_get(addressmap, address);
|
|
|
- if (!new_address || (!strcasecmp(address,new_address) &&
|
|
|
- wildcard_addr == wildcard_new_addr)) {
|
|
|
- /* Remove the mapping, if any. */
|
|
|
- tor_free(new_address);
|
|
|
- if (ent) {
|
|
|
- addressmap_ent_remove(address,ent);
|
|
|
- strmap_remove(addressmap, address);
|
|
|
- }
|
|
|
- return;
|
|
|
- }
|
|
|
- if (!ent) { /* make a new one and register it */
|
|
|
- ent = tor_malloc_zero(sizeof(addressmap_entry_t));
|
|
|
- strmap_set(addressmap, address, ent);
|
|
|
- } else if (ent->new_address) { /* we need to clean up the old mapping. */
|
|
|
- if (expires > 1) {
|
|
|
- log_info(LD_APP,"Temporary addressmap ('%s' to '%s') not performed, "
|
|
|
- "since it's already mapped to '%s'",
|
|
|
- safe_str_client(address),
|
|
|
- safe_str_client(new_address),
|
|
|
- safe_str_client(ent->new_address));
|
|
|
- tor_free(new_address);
|
|
|
- return;
|
|
|
- }
|
|
|
- if (address_is_in_virtual_range(ent->new_address) &&
|
|
|
- expires != 2) {
|
|
|
- /* XXX This isn't the perfect test; we want to avoid removing
|
|
|
- * mappings set from the control interface _as virtual mapping */
|
|
|
- addressmap_virtaddress_remove(address, ent);
|
|
|
- }
|
|
|
- tor_free(ent->new_address);
|
|
|
- } /* else { we have an in-progress resolve with no mapping. } */
|
|
|
-
|
|
|
- ent->new_address = new_address;
|
|
|
- ent->expires = expires==2 ? 1 : expires;
|
|
|
- ent->num_resolve_failures = 0;
|
|
|
- ent->source = source;
|
|
|
- ent->src_wildcard = wildcard_addr ? 1 : 0;
|
|
|
- ent->dst_wildcard = wildcard_new_addr ? 1 : 0;
|
|
|
-
|
|
|
- log_info(LD_CONFIG, "Addressmap: (re)mapped '%s' to '%s'",
|
|
|
- safe_str_client(address),
|
|
|
- safe_str_client(ent->new_address));
|
|
|
- control_event_address_mapped(address, ent->new_address, expires, NULL);
|
|
|
-}
|
|
|
-
|
|
|
-/** An attempt to resolve <b>address</b> failed at some OR.
|
|
|
- * Increment the number of resolve failures we have on record
|
|
|
- * for it, and then return that number.
|
|
|
- */
|
|
|
-int
|
|
|
-client_dns_incr_failures(const char *address)
|
|
|
-{
|
|
|
- addressmap_entry_t *ent = strmap_get(addressmap, address);
|
|
|
- if (!ent) {
|
|
|
- ent = tor_malloc_zero(sizeof(addressmap_entry_t));
|
|
|
- ent->expires = time(NULL) + MAX_DNS_ENTRY_AGE;
|
|
|
- strmap_set(addressmap,address,ent);
|
|
|
- }
|
|
|
- if (ent->num_resolve_failures < SHORT_MAX)
|
|
|
- ++ent->num_resolve_failures; /* don't overflow */
|
|
|
- log_info(LD_APP, "Address %s now has %d resolve failures.",
|
|
|
- safe_str_client(address),
|
|
|
- ent->num_resolve_failures);
|
|
|
- return ent->num_resolve_failures;
|
|
|
-}
|
|
|
-
|
|
|
-/** If <b>address</b> is in the client DNS addressmap, reset
|
|
|
- * the number of resolve failures we have on record for it.
|
|
|
- * This is used when we fail a stream because it won't resolve:
|
|
|
- * otherwise future attempts on that address will only try once.
|
|
|
- */
|
|
|
-void
|
|
|
-client_dns_clear_failures(const char *address)
|
|
|
-{
|
|
|
- addressmap_entry_t *ent = strmap_get(addressmap, address);
|
|
|
- if (ent)
|
|
|
- ent->num_resolve_failures = 0;
|
|
|
-}
|
|
|
-
|
|
|
-/** Record the fact that <b>address</b> resolved to <b>name</b>.
|
|
|
- * We can now use this in subsequent streams via addressmap_rewrite()
|
|
|
- * so we can more correctly choose an exit that will allow <b>address</b>.
|
|
|
- *
|
|
|
- * If <b>exitname</b> is defined, then append the addresses with
|
|
|
- * ".exitname.exit" before registering the mapping.
|
|
|
- *
|
|
|
- * If <b>ttl</b> is nonnegative, the mapping will be valid for
|
|
|
- * <b>ttl</b>seconds; otherwise, we use the default.
|
|
|
- */
|
|
|
-static void
|
|
|
-client_dns_set_addressmap_impl(const char *address, const char *name,
|
|
|
- const char *exitname,
|
|
|
- int ttl)
|
|
|
-{
|
|
|
- /* <address>.<hex or nickname>.exit\0 or just <address>\0 */
|
|
|
- char extendedaddress[MAX_SOCKS_ADDR_LEN+MAX_VERBOSE_NICKNAME_LEN+10];
|
|
|
- /* 123.123.123.123.<hex or nickname>.exit\0 or just 123.123.123.123\0 */
|
|
|
- char extendedval[INET_NTOA_BUF_LEN+MAX_VERBOSE_NICKNAME_LEN+10];
|
|
|
-
|
|
|
- tor_assert(address);
|
|
|
- tor_assert(name);
|
|
|
-
|
|
|
- if (ttl<0)
|
|
|
- ttl = DEFAULT_DNS_TTL;
|
|
|
- else
|
|
|
- ttl = dns_clip_ttl(ttl);
|
|
|
-
|
|
|
- if (exitname) {
|
|
|
- /* XXXX fails to ever get attempts to get an exit address of
|
|
|
- * google.com.digest[=~]nickname.exit; we need a syntax for this that
|
|
|
- * won't make strict RFC952-compliant applications (like us) barf. */
|
|
|
- tor_snprintf(extendedaddress, sizeof(extendedaddress),
|
|
|
- "%s.%s.exit", address, exitname);
|
|
|
- tor_snprintf(extendedval, sizeof(extendedval),
|
|
|
- "%s.%s.exit", name, exitname);
|
|
|
- } else {
|
|
|
- tor_snprintf(extendedaddress, sizeof(extendedaddress),
|
|
|
- "%s", address);
|
|
|
- tor_snprintf(extendedval, sizeof(extendedval),
|
|
|
- "%s", name);
|
|
|
- }
|
|
|
- addressmap_register(extendedaddress, tor_strdup(extendedval),
|
|
|
- time(NULL) + ttl, ADDRMAPSRC_DNS, 0, 0);
|
|
|
-}
|
|
|
-
|
|
|
-/** Record the fact that <b>address</b> resolved to <b>val</b>.
|
|
|
- * We can now use this in subsequent streams via addressmap_rewrite()
|
|
|
- * so we can more correctly choose an exit that will allow <b>address</b>.
|
|
|
- *
|
|
|
- * If <b>exitname</b> is defined, then append the addresses with
|
|
|
- * ".exitname.exit" before registering the mapping.
|
|
|
- *
|
|
|
- * If <b>ttl</b> is nonnegative, the mapping will be valid for
|
|
|
- * <b>ttl</b>seconds; otherwise, we use the default.
|
|
|
- */
|
|
|
-void
|
|
|
-client_dns_set_addressmap(const char *address, uint32_t val,
|
|
|
- const char *exitname,
|
|
|
- int ttl)
|
|
|
-{
|
|
|
- struct in_addr in;
|
|
|
- char valbuf[INET_NTOA_BUF_LEN];
|
|
|
-
|
|
|
- tor_assert(address);
|
|
|
-
|
|
|
- if (tor_inet_aton(address, &in))
|
|
|
- return; /* If address was an IP address already, don't add a mapping. */
|
|
|
- in.s_addr = htonl(val);
|
|
|
- tor_inet_ntoa(&in,valbuf,sizeof(valbuf));
|
|
|
-
|
|
|
- client_dns_set_addressmap_impl(address, valbuf, exitname, ttl);
|
|
|
-}
|
|
|
-
|
|
|
-/** Add a cache entry noting that <b>address</b> (ordinarily a dotted quad)
|
|
|
- * resolved via a RESOLVE_PTR request to the hostname <b>v</b>.
|
|
|
- *
|
|
|
- * If <b>exitname</b> is defined, then append the addresses with
|
|
|
- * ".exitname.exit" before registering the mapping.
|
|
|
- *
|
|
|
- * If <b>ttl</b> is nonnegative, the mapping will be valid for
|
|
|
- * <b>ttl</b>seconds; otherwise, we use the default.
|
|
|
- */
|
|
|
-static void
|
|
|
-client_dns_set_reverse_addressmap(const char *address, const char *v,
|
|
|
- const char *exitname,
|
|
|
- int ttl)
|
|
|
-{
|
|
|
- char *s = NULL;
|
|
|
- tor_asprintf(&s, "REVERSE[%s]", address);
|
|
|
- client_dns_set_addressmap_impl(s, v, exitname, ttl);
|
|
|
- tor_free(s);
|
|
|
-}
|
|
|
-
|
|
|
-/* By default, we hand out 127.192.0.1 through 127.254.254.254.
|
|
|
- * These addresses should map to localhost, so even if the
|
|
|
- * application accidentally tried to connect to them directly (not
|
|
|
- * via Tor), it wouldn't get too far astray.
|
|
|
- *
|
|
|
- * These options are configured by parse_virtual_addr_network().
|
|
|
- */
|
|
|
-/** Which network should we use for virtual IPv4 addresses? Only the first
|
|
|
- * bits of this value are fixed. */
|
|
|
-static uint32_t virtual_addr_network = 0x7fc00000u;
|
|
|
-/** How many bits of <b>virtual_addr_network</b> are fixed? */
|
|
|
-static maskbits_t virtual_addr_netmask_bits = 10;
|
|
|
-/** What's the next virtual address we will hand out? */
|
|
|
-static uint32_t next_virtual_addr = 0x7fc00000u;
|
|
|
-
|
|
|
-/** Read a netmask of the form 127.192.0.0/10 from "val", and check whether
|
|
|
- * it's a valid set of virtual addresses to hand out in response to MAPADDRESS
|
|
|
- * requests. Return 0 on success; set *msg (if provided) to a newly allocated
|
|
|
- * string and return -1 on failure. If validate_only is false, sets the
|
|
|
- * actual virtual address range to the parsed value. */
|
|
|
-int
|
|
|
-parse_virtual_addr_network(const char *val, int validate_only,
|
|
|
- char **msg)
|
|
|
-{
|
|
|
- uint32_t addr;
|
|
|
- uint16_t port_min, port_max;
|
|
|
- maskbits_t bits;
|
|
|
-
|
|
|
- if (parse_addr_and_port_range(val, &addr, &bits, &port_min, &port_max)) {
|
|
|
- if (msg) *msg = tor_strdup("Error parsing VirtualAddressNetwork");
|
|
|
- return -1;
|
|
|
- }
|
|
|
-
|
|
|
- if (port_min != 1 || port_max != 65535) {
|
|
|
- if (msg) *msg = tor_strdup("Can't specify ports on VirtualAddressNetwork");
|
|
|
- return -1;
|
|
|
- }
|
|
|
-
|
|
|
- if (bits > 16) {
|
|
|
- if (msg) *msg = tor_strdup("VirtualAddressNetwork expects a /16 "
|
|
|
- "network or larger");
|
|
|
- return -1;
|
|
|
- }
|
|
|
-
|
|
|
- if (validate_only)
|
|
|
- return 0;
|
|
|
-
|
|
|
- virtual_addr_network = (uint32_t)( addr & (0xfffffffful << (32-bits)) );
|
|
|
- virtual_addr_netmask_bits = bits;
|
|
|
-
|
|
|
- if (addr_mask_cmp_bits(next_virtual_addr, addr, bits))
|
|
|
- next_virtual_addr = addr;
|
|
|
-
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-/**
|
|
|
- * Return true iff <b>addr</b> is likely to have been returned by
|
|
|
- * client_dns_get_unused_address.
|
|
|
- **/
|
|
|
-static int
|
|
|
-address_is_in_virtual_range(const char *address)
|
|
|
-{
|
|
|
- struct in_addr in;
|
|
|
- tor_assert(address);
|
|
|
- if (!strcasecmpend(address, ".virtual")) {
|
|
|
- return 1;
|
|
|
- } else if (tor_inet_aton(address, &in)) {
|
|
|
- uint32_t addr = ntohl(in.s_addr);
|
|
|
- if (!addr_mask_cmp_bits(addr, virtual_addr_network,
|
|
|
- virtual_addr_netmask_bits))
|
|
|
- return 1;
|
|
|
- }
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-/** Increment the value of next_virtual_addr; reset it to the start of the
|
|
|
- * virtual address range if it wraps around.
|
|
|
- */
|
|
|
-static INLINE void
|
|
|
-increment_virtual_addr(void)
|
|
|
-{
|
|
|
- ++next_virtual_addr;
|
|
|
- if (addr_mask_cmp_bits(next_virtual_addr, virtual_addr_network,
|
|
|
- virtual_addr_netmask_bits))
|
|
|
- next_virtual_addr = virtual_addr_network;
|
|
|
-}
|
|
|
-
|
|
|
-/** Return a newly allocated string holding an address of <b>type</b>
|
|
|
- * (one of RESOLVED_TYPE_{IPV4|HOSTNAME}) that has not yet been mapped,
|
|
|
- * and that is very unlikely to be the address of any real host.
|
|
|
- *
|
|
|
- * May return NULL if we have run out of virtual addresses.
|
|
|
- */
|
|
|
-static char *
|
|
|
-addressmap_get_virtual_address(int type)
|
|
|
-{
|
|
|
- char buf[64];
|
|
|
- tor_assert(addressmap);
|
|
|
-
|
|
|
- if (type == RESOLVED_TYPE_HOSTNAME) {
|
|
|
- char rand[10];
|
|
|
- do {
|
|
|
- crypto_rand(rand, sizeof(rand));
|
|
|
- base32_encode(buf,sizeof(buf),rand,sizeof(rand));
|
|
|
- strlcat(buf, ".virtual", sizeof(buf));
|
|
|
- } while (strmap_get(addressmap, buf));
|
|
|
- return tor_strdup(buf);
|
|
|
- } else if (type == RESOLVED_TYPE_IPV4) {
|
|
|
- // This is an imperfect estimate of how many addresses are available, but
|
|
|
- // that's ok.
|
|
|
- struct in_addr in;
|
|
|
- uint32_t available = 1u << (32-virtual_addr_netmask_bits);
|
|
|
- while (available) {
|
|
|
- /* Don't hand out any .0 or .255 address. */
|
|
|
- while ((next_virtual_addr & 0xff) == 0 ||
|
|
|
- (next_virtual_addr & 0xff) == 0xff) {
|
|
|
- increment_virtual_addr();
|
|
|
- if (! --available) {
|
|
|
- log_warn(LD_CONFIG, "Ran out of virtual addresses!");
|
|
|
- return NULL;
|
|
|
- }
|
|
|
- }
|
|
|
- in.s_addr = htonl(next_virtual_addr);
|
|
|
- tor_inet_ntoa(&in, buf, sizeof(buf));
|
|
|
- if (!strmap_get(addressmap, buf)) {
|
|
|
- increment_virtual_addr();
|
|
|
- break;
|
|
|
- }
|
|
|
-
|
|
|
- increment_virtual_addr();
|
|
|
- --available;
|
|
|
- // log_info(LD_CONFIG, "%d addrs available", (int)available);
|
|
|
- if (! available) {
|
|
|
- log_warn(LD_CONFIG, "Ran out of virtual addresses!");
|
|
|
- return NULL;
|
|
|
- }
|
|
|
- }
|
|
|
- return tor_strdup(buf);
|
|
|
- } else {
|
|
|
- log_warn(LD_BUG, "Called with unsupported address type (%d)", type);
|
|
|
- return NULL;
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-/** A controller has requested that we map some address of type
|
|
|
- * <b>type</b> to the address <b>new_address</b>. Choose an address
|
|
|
- * that is unlikely to be used, and map it, and return it in a newly
|
|
|
- * allocated string. If another address of the same type is already
|
|
|
- * mapped to <b>new_address</b>, try to return a copy of that address.
|
|
|
- *
|
|
|
- * The string in <b>new_address</b> may be freed or inserted into a map
|
|
|
- * as appropriate. May return NULL if are out of virtual addresses.
|
|
|
- **/
|
|
|
-const char *
|
|
|
-addressmap_register_virtual_address(int type, char *new_address)
|
|
|
-{
|
|
|
- char **addrp;
|
|
|
- virtaddress_entry_t *vent;
|
|
|
- int vent_needs_to_be_added = 0;
|
|
|
-
|
|
|
- tor_assert(new_address);
|
|
|
- tor_assert(addressmap);
|
|
|
- tor_assert(virtaddress_reversemap);
|
|
|
-
|
|
|
- vent = strmap_get(virtaddress_reversemap, new_address);
|
|
|
- if (!vent) {
|
|
|
- vent = tor_malloc_zero(sizeof(virtaddress_entry_t));
|
|
|
- vent_needs_to_be_added = 1;
|
|
|
- }
|
|
|
-
|
|
|
- addrp = (type == RESOLVED_TYPE_IPV4) ?
|
|
|
- &vent->ipv4_address : &vent->hostname_address;
|
|
|
- if (*addrp) {
|
|
|
- addressmap_entry_t *ent = strmap_get(addressmap, *addrp);
|
|
|
- if (ent && ent->new_address &&
|
|
|
- !strcasecmp(new_address, ent->new_address)) {
|
|
|
- tor_free(new_address);
|
|
|
- tor_assert(!vent_needs_to_be_added);
|
|
|
- return tor_strdup(*addrp);
|
|
|
- } else
|
|
|
- log_warn(LD_BUG,
|
|
|
- "Internal confusion: I thought that '%s' was mapped to by "
|
|
|
- "'%s', but '%s' really maps to '%s'. This is a harmless bug.",
|
|
|
- safe_str_client(new_address),
|
|
|
- safe_str_client(*addrp),
|
|
|
- safe_str_client(*addrp),
|
|
|
- ent?safe_str_client(ent->new_address):"(nothing)");
|
|
|
- }
|
|
|
-
|
|
|
- tor_free(*addrp);
|
|
|
- *addrp = addressmap_get_virtual_address(type);
|
|
|
- if (!*addrp) {
|
|
|
- tor_free(vent);
|
|
|
- tor_free(new_address);
|
|
|
- return NULL;
|
|
|
- }
|
|
|
- log_info(LD_APP, "Registering map from %s to %s", *addrp, new_address);
|
|
|
- if (vent_needs_to_be_added)
|
|
|
- strmap_set(virtaddress_reversemap, new_address, vent);
|
|
|
- addressmap_register(*addrp, new_address, 2, ADDRMAPSRC_AUTOMAP, 0, 0);
|
|
|
-
|
|
|
-#if 0
|
|
|
- {
|
|
|
- /* Try to catch possible bugs */
|
|
|
- addressmap_entry_t *ent;
|
|
|
- ent = strmap_get(addressmap, *addrp);
|
|
|
- tor_assert(ent);
|
|
|
- tor_assert(!strcasecmp(ent->new_address,new_address));
|
|
|
- vent = strmap_get(virtaddress_reversemap, new_address);
|
|
|
- tor_assert(vent);
|
|
|
- tor_assert(!strcasecmp(*addrp,
|
|
|
- (type == RESOLVED_TYPE_IPV4) ?
|
|
|
- vent->ipv4_address : vent->hostname_address));
|
|
|
- log_info(LD_APP, "Map from %s to %s okay.",
|
|
|
- safe_str_client(*addrp),
|
|
|
- safe_str_client(new_address));
|
|
|
- }
|
|
|
-#endif
|
|
|
-
|
|
|
- return *addrp;
|
|
|
-}
|
|
|
-
|
|
|
-/** Return 1 if <b>address</b> has funny characters in it like colons. Return
|
|
|
- * 0 if it's fine, or if we're configured to allow it anyway. <b>client</b>
|
|
|
- * should be true if we're using this address as a client; false if we're
|
|
|
- * using it as a server.
|
|
|
- */
|
|
|
-int
|
|
|
-address_is_invalid_destination(const char *address, int client)
|
|
|
-{
|
|
|
- if (client) {
|
|
|
- if (get_options()->AllowNonRFC953Hostnames)
|
|
|
- return 0;
|
|
|
- } else {
|
|
|
- if (get_options()->ServerDNSAllowNonRFC953Hostnames)
|
|
|
- return 0;
|
|
|
- }
|
|
|
-
|
|
|
- while (*address) {
|
|
|
- if (TOR_ISALNUM(*address) ||
|
|
|
- *address == '-' ||
|
|
|
- *address == '.' ||
|
|
|
- *address == '_') /* Underscore is not allowed, but Windows does it
|
|
|
- * sometimes, just to thumb its nose at the IETF. */
|
|
|
- ++address;
|
|
|
- else
|
|
|
- return 1;
|
|
|
- }
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-/** Iterate over all address mappings which have expiry times between
|
|
|
- * min_expires and max_expires, inclusive. If sl is provided, add an
|
|
|
- * "old-addr new-addr expiry" string to sl for each mapping, omitting
|
|
|
- * the expiry time if want_expiry is false. If sl is NULL, remove the
|
|
|
- * mappings.
|
|
|
- */
|
|
|
-void
|
|
|
-addressmap_get_mappings(smartlist_t *sl, time_t min_expires,
|
|
|
- time_t max_expires, int want_expiry)
|
|
|
-{
|
|
|
- strmap_iter_t *iter;
|
|
|
- const char *key;
|
|
|
- void *val_;
|
|
|
- addressmap_entry_t *val;
|
|
|
-
|
|
|
- if (!addressmap)
|
|
|
- addressmap_init();
|
|
|
-
|
|
|
- for (iter = strmap_iter_init(addressmap); !strmap_iter_done(iter); ) {
|
|
|
- strmap_iter_get(iter, &key, &val_);
|
|
|
- val = val_;
|
|
|
- if (val->expires >= min_expires && val->expires <= max_expires) {
|
|
|
- if (!sl) {
|
|
|
- iter = strmap_iter_next_rmv(addressmap,iter);
|
|
|
- addressmap_ent_remove(key, val);
|
|
|
- continue;
|
|
|
- } else if (val->new_address) {
|
|
|
- const char *src_wc = val->src_wildcard ? "*." : "";
|
|
|
- const char *dst_wc = val->dst_wildcard ? "*." : "";
|
|
|
- if (want_expiry) {
|
|
|
- if (val->expires < 3 || val->expires == TIME_MAX)
|
|
|
- smartlist_add_asprintf(sl, "%s%s %s%s NEVER",
|
|
|
- src_wc, key, dst_wc, val->new_address);
|
|
|
- else {
|
|
|
- char time[ISO_TIME_LEN+1];
|
|
|
- format_iso_time(time, val->expires);
|
|
|
- smartlist_add_asprintf(sl, "%s%s %s%s \"%s\"",
|
|
|
- src_wc, key, dst_wc, val->new_address,
|
|
|
- time);
|
|
|
- }
|
|
|
- } else {
|
|
|
- smartlist_add_asprintf(sl, "%s%s %s%s",
|
|
|
- src_wc, key, dst_wc, val->new_address);
|
|
|
- }
|
|
|
- }
|
|
|
- }
|
|
|
- iter = strmap_iter_next(addressmap,iter);
|
|
|
- }
|
|
|
-}
|
|
|
|
|
|
/** Check if <b>conn</b> is using a dangerous port. Then warn and/or
|
|
|
* reject depending on our config options. */
|
Nick Mathewson