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socks: Returns 0xF6 only if BAD_HOSTNAME

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This commit modifies the behavior of `parse_extended_address` in such a way
that if it fails, it will always return a `BAD_HOSTNAME` value, which is then
used to return the 0xF6 extended error code.  This way, in any case that is
not a valid v2 address, we return the 0xF6 error code, which is the expected
behavior.

Signed-off-by: David Goulet <dgoulet@torproject.org>
This commit is contained in:
Guinness 2020-07-08 17:46:16 +02:00 committed by David Goulet
parent 9603d8af0b
commit 562957e0db
3 changed files with 15 additions and 2 deletions
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4
changes/ticket33873 Normal file
View File

@ -0,0 +1,4 @@
o Minor bugfix (SOCKS, onion service client):
- Also detect bad v3 onion service address of the wrong length when
returning the F6 ExtendedErrors code. Fixes bug 33873; bugfix on
0.4.3.1-alpha.

5
src/core/or/connection_edge.c
View File

@ -1663,6 +1663,9 @@ parse_extended_hostname(char *address, hostname_type_t *type_out)
log_warn(LD_APP, "Invalid %shostname %s; rejecting",
is_onion ? "onion " : "",
safe_str_client(address));
if (*type_out == ONION_V3_HOSTNAME) {
*type_out = BAD_HOSTNAME;
}
return false;
}
@ -2139,7 +2142,7 @@ connection_ap_handshake_rewrite_and_attach(entry_connection_t *conn,
if (!parse_extended_hostname(socks->address, &addresstype)) {
control_event_client_status(LOG_WARN, "SOCKS_BAD_HOSTNAME HOSTNAME=%s",
escaped(socks->address));
if (addresstype == ONION_V3_HOSTNAME) {
if (addresstype == BAD_HOSTNAME) {
conn->socks_request->socks_extended_error_code = SOCKS5_HS_BAD_ADDRESS;
}
connection_mark_unattached_ap(conn, END_STREAM_REASON_TORPROTOCOL);

8
src/test/test_hs_common.c
View File

@ -792,6 +792,8 @@ test_parse_extended_hostname(void *arg)
"www.25njqamcweflpvkl73j4szahhihoc4xt3ktcgjnpaingr5yhkenl5sid.onion";
char address9[] =
"www.15njqamcweflpvkl73j4szahhihoc4xt3ktcgjnpaingr5yhkenl5sid.onion";
char address10[] =
"15njqamcweflpvkl73j4szahhihoc4xt3ktcgjnpaingr5yhkenl5sid7jdl.onion";
tt_assert(!parse_extended_hostname(address1, &type));
tt_int_op(type, OP_EQ, BAD_HOSTNAME);
@ -824,7 +826,11 @@ test_parse_extended_hostname(void *arg)
/* Invalid v3 address. */
tt_assert(!parse_extended_hostname(address9, &type));
tt_int_op(type, OP_EQ, ONION_V3_HOSTNAME);
tt_int_op(type, OP_EQ, BAD_HOSTNAME);
/* Invalid v3 address: too long */
tt_assert(!parse_extended_hostname(address10, &type));
tt_int_op(type, OP_EQ, BAD_HOSTNAME);
done: ;
}