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Make ClientDNSRejectInternalAddresses testing-only.

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Undeprecate it;
rename it to TestingClientDNSRejectInternalAddresses;
add the old name as an alias;
reject configurations where it is set but TestingTorNetwork is not;
change the documentation accordingly.

Closes tickets 21031 and 21522.
This commit is contained in:
Nick Mathewson 2017-09-07 10:03:31 -04:00
parent 8421756da3
commit 27fa4a98d2
7 changed files with 25 additions and 18 deletions
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5
changes/ticket21031 Normal file
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@ -0,0 +1,5 @@
o Removed features:
- The ClientDNSRejectInternalAddresses flag can no longer be set on
non-testing networks. It has been deprecated since 0.2.9.2-alpha.
Closes ticket 21031.

15
doc/tor.1.txt
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@ -1408,12 +1408,6 @@ The following options are useful only for clients (that is, if
addresses/ports. See SocksPort for an explanation of isolation
flags. (Default: 0)
[[ClientDNSRejectInternalAddresses]] **ClientDNSRejectInternalAddresses** **0**|**1**::
If true, Tor does not believe any anonymously retrieved DNS answer that
tells it that an address resolves to an internal address (like 127.0.0.1 or
192.168.0.1). This option prevents certain browser-based attacks; don't
turn it off unless you know what you're doing. (Default: 1)
[[ClientRejectInternalAddresses]] **ClientRejectInternalAddresses** **0**|**1**::
If true, Tor does not try to fulfill requests to connect to an internal
address (like 127.0.0.1 or 192.168.0.1) __unless a exit node is
@ -2468,7 +2462,7 @@ The following options are used for running a testing Tor network.
4 (for 40 seconds), 8, 16, 32, 60
ClientBootstrapConsensusMaxDownloadTries 80
ClientBootstrapConsensusAuthorityOnlyMaxDownloadTries 80
ClientDNSRejectInternalAddresses 0
TestingClientDNSRejectInternalAddresses 0
ClientRejectInternalAddresses 0
CountPrivateBandwidth 1
ExitPolicyRejectPrivate 0
@ -2670,6 +2664,13 @@ The following options are used for running a testing Tor network.
we replace it and issue a new key?
(Default: 3 hours for link and auth; 1 day for signing.)
[[ClientDNSRejectInternalAddresses]] [[TestingClientDNSRejectInternalAddresses]] **TestingClientDNSRejectInternalAddresses** **0**|**1**::
If true, Tor does not believe any anonymously retrieved DNS answer that
tells it that an address resolves to an internal address (like 127.0.0.1 or
192.168.0.1). This option prevents certain browser-based attacks; don't
turn it off unless you know what you're doing. (Default: 1)
NON-PERSISTENT OPTIONS
----------------------

9
src/or/config.c
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@ -169,6 +169,8 @@ static config_abbrev_t option_abbrevs_[] = {
{ "BridgeAuthoritativeDirectory", "BridgeAuthoritativeDir", 0, 0},
{ "HashedControlPassword", "__HashedControlSessionPassword", 1, 0},
{ "VirtualAddrNetwork", "VirtualAddrNetworkIPv4", 0, 0},
{ "ClientDNSRejectInternalAddresses",
"TestingClientDNSRejectInternalAddresses", 0, 1, },
{ NULL, NULL, 0, 0},
};
@ -251,7 +253,7 @@ static config_var_t option_vars_[] = {
V(CircuitsAvailableTimeout, INTERVAL, "0"),
V(CircuitStreamTimeout, INTERVAL, "0"),
V(CircuitPriorityHalflife, DOUBLE, "-100.0"), /*negative:'Use default'*/
V(ClientDNSRejectInternalAddresses, BOOL,"1"),
V(TestingClientDNSRejectInternalAddresses, BOOL,"1"),
V(ClientOnly, BOOL, "0"),
V(ClientPreferIPv6ORPort, AUTOBOOL, "auto"),
V(ClientPreferIPv6DirPort, AUTOBOOL, "auto"),
@ -626,7 +628,7 @@ static const config_var_t testing_tor_network_defaults[] = {
"0, 1, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 8, 16, 32, 60"),
V(ClientBootstrapConsensusMaxDownloadTries, UINT, "80"),
V(ClientBootstrapConsensusAuthorityOnlyMaxDownloadTries, UINT, "80"),
V(ClientDNSRejectInternalAddresses, BOOL,"0"), // deprecated in 0.2.9.2-alpha
V(TestingClientDNSRejectInternalAddresses, BOOL,"0"),
V(ClientRejectInternalAddresses, BOOL, "0"),
V(CountPrivateBandwidth, BOOL, "1"),
V(ExitPolicyRejectPrivate, BOOL, "0"),
@ -673,8 +675,6 @@ static const config_deprecation_t option_deprecation_notes_[] = {
/* Deprecated since 0.2.9.2-alpha... */
{ "AllowDotExit", "Unrestricted use of the .exit notation can be used for "
"a wide variety of application-level attacks." },
{ "ClientDNSRejectInternalAddresses", "Turning this on makes your client "
"easier to fingerprint, and may open you to esoteric attacks." },
/* End of options deprecated since 0.2.9.2-alpha. */
/* Deprecated since 0.3.2.0-alpha. */
@ -4074,6 +4074,7 @@ options_validate(or_options_t *old_options, or_options_t *options,
CHECK_DEFAULT(TestingSigningKeySlop);
CHECK_DEFAULT(TestingAuthKeySlop);
CHECK_DEFAULT(TestingLinkKeySlop);
CHECK_DEFAULT(TestingClientDNSRejectInternalAddresses);
#undef CHECK_DEFAULT
if (options->SigningKeyLifetime < options->TestingSigningKeySlop*2)

2
src/or/connection_edge.c
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@ -1343,7 +1343,7 @@ connection_ap_handshake_rewrite(entry_connection_t *conn,
/* Hang on, did we find an answer saying that this is a reverse lookup for
* an internal address? If so, we should reject it if we're configured to
* do so. */
if (options->ClientDNSRejectInternalAddresses) {
if (options->TestingClientDNSRejectInternalAddresses) {
/* Don't let clients try to do a reverse lookup on 10.0.0.1. */
tor_addr_t addr;
int ok;

2
src/or/or.h
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@ -4203,7 +4203,7 @@ typedef struct {
/** If true, do not believe anybody who tells us that a domain resolves
* to an internal address, or that an internal address has a PTR mapping.
* Helps avoid some cross-site attacks. */
int ClientDNSRejectInternalAddresses;
int TestingClientDNSRejectInternalAddresses;
/** If true, do not accept any requests to connect to internal addresses
* over randomly chosen exits. */

6
src/or/relay.c
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@ -930,7 +930,7 @@ connection_ap_process_end_not_open(
connection_mark_unattached_ap(conn, END_STREAM_REASON_TORPROTOCOL);
return 0;
}
if (get_options()->ClientDNSRejectInternalAddresses &&
if (get_options()->TestingClientDNSRejectInternalAddresses &&
tor_addr_is_internal(&addr, 0)) {
log_info(LD_APP,"Address '%s' resolved to internal. Closing,",
safe_str(conn->socks_request->address));
@ -1347,7 +1347,7 @@ connection_edge_process_resolved_cell(edge_connection_t *conn,
goto done;
}
if (get_options()->ClientDNSRejectInternalAddresses) {
if (get_options()->TestingClientDNSRejectInternalAddresses) {
int orig_len = smartlist_len(resolved_addresses);
SMARTLIST_FOREACH_BEGIN(resolved_addresses, address_ttl_t *, addr) {
if (addr->hostname == NULL && tor_addr_is_internal(&addr->addr, 0)) {
@ -1440,7 +1440,7 @@ connection_edge_process_relay_cell_not_open(
if (tor_addr_family(&addr) != AF_UNSPEC) {
const sa_family_t family = tor_addr_family(&addr);
if (tor_addr_is_null(&addr) ||
(get_options()->ClientDNSRejectInternalAddresses &&
(get_options()->TestingClientDNSRejectInternalAddresses &&
tor_addr_is_internal(&addr, 0))) {
log_info(LD_APP, "...but it claims the IP address was %s. Closing.",
fmt_addr(&addr));

4
src/test/test_relaycell.c
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@ -112,7 +112,7 @@ test_relaycell_resolved(void *arg)
MOCK(connection_mark_unattached_ap_, mark_unattached_mock);
MOCK(connection_ap_handshake_socks_resolved, socks_resolved_mock);
options->ClientDNSRejectInternalAddresses = 0;
options->TestingClientDNSRejectInternalAddresses = 0;
SET_CELL(/* IPv4: 127.0.1.2, ttl 256 */
"\x04\x04\x7f\x00\x01\x02\x00\x00\x01\x00"
@ -151,7 +151,7 @@ test_relaycell_resolved(void *arg)
/* But we may be discarding private answers. */
MOCK_RESET();
options->ClientDNSRejectInternalAddresses = 1;
options->TestingClientDNSRejectInternalAddresses = 1;
r = connection_edge_process_resolved_cell(edgeconn, &cell, &rh);
tt_int_op(r, OP_EQ, 0);
ASSERT_MARK_CALLED(END_STREAM_REASON_DONE|