From c4fe66e342292b45f29e9fd242b66a0ca27a7758 Mon Sep 17 00:00:00 2001 From: Nick Mathewson Date: Mon, 14 Dec 2020 10:14:03 -0500 Subject: Socks5: handle truncated client requests correctly Previously, our code would send back an error if the socks5 request parser said anything but DONE. But there are other non-error cases, like TRUNCATED: we shouldn't send back errors for them. This patch lowers the responsibility for setting the error message into the parsing code, since the actual type of the error message will depend on what problem was encountered. Fixes bug 40190; bugfix on 0.3.5.1-alpha. --- src/core/proto/proto_socks.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'src') diff --git a/src/core/proto/proto_socks.c b/src/core/proto/proto_socks.c index c7bf13b9f4..5a7d7ac9be 100644 --- a/src/core/proto/proto_socks.c +++ b/src/core/proto/proto_socks.c @@ -545,6 +545,7 @@ parse_socks5_client_request(const uint8_t *raw_data, socks_request_t *req, if (parsed == -1) { log_warn(LD_APP, "socks5: parsing failed - invalid client request"); res = SOCKS_RESULT_INVALID; + socks_request_set_socks5_error(req, SOCKS5_GENERAL_ERROR); goto end; } else if (parsed == -2) { res = SOCKS_RESULT_TRUNCATED; @@ -556,6 +557,7 @@ parse_socks5_client_request(const uint8_t *raw_data, socks_request_t *req, if (socks5_client_request_get_version(trunnel_req) != 5) { res = SOCKS_RESULT_INVALID; + socks_request_set_socks5_error(req, SOCKS5_GENERAL_ERROR); goto end; } @@ -590,6 +592,7 @@ parse_socks5_client_request(const uint8_t *raw_data, socks_request_t *req, tor_addr_to_str(req->address, &destaddr, sizeof(req->address), 1); } break; default: { + socks_request_set_socks5_error(req, SOCKS5_ADDRESS_TYPE_NOT_SUPPORTED); res = -1; } break; } @@ -770,8 +773,10 @@ handle_socks_message(const uint8_t *raw_data, size_t datalen, } else { res = parse_socks5_client_request(raw_data, req, datalen, drain_out); - if (res != SOCKS_RESULT_DONE) { + if (BUG(res == SOCKS_RESULT_INVALID && req->replylen == 0)) { socks_request_set_socks5_error(req, SOCKS5_GENERAL_ERROR); + } + if (res != SOCKS_RESULT_DONE) { goto end; } -- cgit v1.2.3-54-g00ecf