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socks: Send back extended error code if set

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This commit defines the new extended error codes. It also flags the socks
request object that it can use them.

Part of #30382

Signed-off-by: David Goulet <dgoulet@torproject.org>
This commit is contained in:
David Goulet 2019-10-17 08:52:58 -04:00
parent 78a9158bf0
commit 84162c1d33
4 changed files with 26 additions and 2 deletions
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2
src/core/mainloop/connection.c
View File

@ -1905,6 +1905,8 @@ connection_init_accepted_conn(connection_t *conn,
conn->state = AP_CONN_STATE_SOCKS_WAIT;
TO_ENTRY_CONN(conn)->socks_request->socks_prefer_no_auth =
listener->entry_cfg.socks_prefer_no_auth;
TO_ENTRY_CONN(conn)->socks_request->socks_use_extended_errors =
listener->entry_cfg.extended_socks5_codes;
break;
case CONN_TYPE_AP_TRANS_LISTENER:
TO_ENTRY_CONN(conn)->is_transparent_ap = 1;

10
src/core/or/connection_edge.c
View File

@ -3522,11 +3522,17 @@ connection_ap_handshake_socks_reply(entry_connection_t *conn, char *reply,
size_t replylen, int endreason)
{
char buf[256];
socks5_reply_status_t status =
stream_end_reason_to_socks5_response(endreason);
socks5_reply_status_t status;
tor_assert(conn->socks_request); /* make sure it's an AP stream */
if (conn->socks_request->socks_use_extended_errors &&
conn->socks_request->socks_extended_error_code != 0) {
status = conn->socks_request->socks_extended_error_code;
} else {
status = stream_end_reason_to_socks5_response(endreason);
}
if (!SOCKS_COMMAND_IS_RESOLVE(conn->socks_request->command)) {
control_event_stream_status(conn, status==SOCKS5_SUCCEEDED ?
STREAM_EVENT_SUCCEEDED : STREAM_EVENT_FAILED,

7
src/core/or/socks_request_st.h
View File

@ -7,6 +7,8 @@
#ifndef SOCKS_REQUEST_ST_H
#define SOCKS_REQUEST_ST_H
#include "lib/net/socks5_status.h"
#define MAX_SOCKS_REPLY_LEN 1024
#define SOCKS_NO_AUTH 0x00
@ -58,6 +60,11 @@ struct socks_request_t {
* "username/password" authentication if both are offered. Used as input to
* parse_socks. */
unsigned int socks_prefer_no_auth : 1;
/** If set, we can send back the extended error code in the reply. */
unsigned int socks_use_extended_errors : 1;
/** If non zero, this contains the extended error code that should be used
* if the port was configured to use them. */
socks5_reply_status_t socks_extended_error_code;
/** Number of bytes in username; 0 if username is NULL */
size_t usernamelen;

9
src/lib/net/socks5_status.h
View File

@ -27,6 +27,15 @@ typedef enum {
SOCKS5_TTL_EXPIRED = 0x06,
SOCKS5_COMMAND_NOT_SUPPORTED = 0x07,
SOCKS5_ADDRESS_TYPE_NOT_SUPPORTED = 0x08,
/* Extended error code (see prop304). Only used if the SocksPort flag
* "ExtendedErrors" is set. */
SOCKS5_HS_NOT_FOUND = 0xF0,
SOCKS5_HS_IS_INVALID = 0xF1,
SOCKS5_HS_INTRO_FAILED = 0xF2,
SOCKS5_HS_REND_FAILED = 0xF3,
SOCKS5_HS_MISSING_CLIENT_AUTH = 0xF4,
SOCKS5_HS_BAD_CLIENT_AUTH = 0xF5,
} socks5_reply_status_t;
#endif /* !defined(TOR_SOCKS5_STATUS_H) */