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ce0a89e262
To fix a major security problem related to incorrect use of SSL/TLS renegotiation, OpenSSL has turned off renegotiation by default. We are not affected by this security problem, however, since we do renegotiation right. (Specifically, we never treat a renegotiated credential as authenticating previous communication.) Nevertheless, OpenSSL's new behavior requires us to explicitly turn renegotiation back on in order to get our protocol working again. Amusingly, this is not so simple as "set the flag when you create the SSL object" , since calling connect or accept seems to clear the flags. For belt-and-suspenders purposes, we clear the flag once the Tor handshake is done. There's no way to exploit a second handshake either, but we might as well not allow it.
90 lines
3.2 KiB
C
90 lines
3.2 KiB
C
/* Copyright (c) 2003, Roger Dingledine
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* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
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* Copyright (c) 2007-2009, The Tor Project, Inc. */
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/* See LICENSE for licensing information */
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#ifndef _TOR_TORTLS_H
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#define _TOR_TORTLS_H
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/**
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* \file tortls.h
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* \brief Headers for tortls.c
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**/
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#include "crypto.h"
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#include "compat.h"
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/* Opaque structure to hold a TLS connection. */
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typedef struct tor_tls_t tor_tls_t;
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/* Possible return values for most tor_tls_* functions. */
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#define _MIN_TOR_TLS_ERROR_VAL -9
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#define TOR_TLS_ERROR_MISC -9
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/* Rename to unexpected close or something. XXXX */
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#define TOR_TLS_ERROR_IO -8
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#define TOR_TLS_ERROR_CONNREFUSED -7
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#define TOR_TLS_ERROR_CONNRESET -6
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#define TOR_TLS_ERROR_NO_ROUTE -5
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#define TOR_TLS_ERROR_TIMEOUT -4
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#define TOR_TLS_CLOSE -3
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#define TOR_TLS_WANTREAD -2
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#define TOR_TLS_WANTWRITE -1
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#define TOR_TLS_DONE 0
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/** Collection of case statements for all TLS errors that are not due to
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* underlying IO failure. */
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#define CASE_TOR_TLS_ERROR_ANY_NONIO \
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case TOR_TLS_ERROR_MISC: \
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case TOR_TLS_ERROR_CONNREFUSED: \
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case TOR_TLS_ERROR_CONNRESET: \
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case TOR_TLS_ERROR_NO_ROUTE: \
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case TOR_TLS_ERROR_TIMEOUT
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/** Use this macro in a switch statement to catch _any_ TLS error. That way,
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* if more errors are added, your switches will still work. */
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#define CASE_TOR_TLS_ERROR_ANY \
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CASE_TOR_TLS_ERROR_ANY_NONIO: \
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case TOR_TLS_ERROR_IO
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#define TOR_TLS_IS_ERROR(rv) ((rv) < TOR_TLS_CLOSE)
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const char *tor_tls_err_to_string(int err);
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void tor_tls_free_all(void);
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int tor_tls_context_new(crypto_pk_env_t *rsa, unsigned int key_lifetime);
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tor_tls_t *tor_tls_new(int sock, int is_server);
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void tor_tls_set_logged_address(tor_tls_t *tls, const char *address);
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void tor_tls_set_renegotiate_callback(tor_tls_t *tls,
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void (*cb)(tor_tls_t *, void *arg),
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void *arg);
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int tor_tls_is_server(tor_tls_t *tls);
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void tor_tls_free(tor_tls_t *tls);
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int tor_tls_peer_has_cert(tor_tls_t *tls);
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int tor_tls_verify(int severity, tor_tls_t *tls, crypto_pk_env_t **identity);
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int tor_tls_check_lifetime(tor_tls_t *tls, int tolerance);
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int tor_tls_read(tor_tls_t *tls, char *cp, size_t len);
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int tor_tls_write(tor_tls_t *tls, const char *cp, size_t n);
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int tor_tls_handshake(tor_tls_t *tls);
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int tor_tls_renegotiate(tor_tls_t *tls);
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void tor_tls_block_renegotiation(tor_tls_t *tls);
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int tor_tls_shutdown(tor_tls_t *tls);
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int tor_tls_get_pending_bytes(tor_tls_t *tls);
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size_t tor_tls_get_forced_write_size(tor_tls_t *tls);
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void tor_tls_get_n_raw_bytes(tor_tls_t *tls,
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size_t *n_read, size_t *n_written);
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void tor_tls_get_buffer_sizes(tor_tls_t *tls,
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size_t *rbuf_capacity, size_t *rbuf_bytes,
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size_t *wbuf_capacity, size_t *wbuf_bytes);
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int tor_tls_used_v1_handshake(tor_tls_t *tls);
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/* Log and abort if there are unhandled TLS errors in OpenSSL's error stack.
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*/
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#define check_no_tls_errors() _check_no_tls_errors(__FILE__,__LINE__)
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void _check_no_tls_errors(const char *fname, int line);
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#endif
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