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293 lines
12 KiB
C
293 lines
12 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) 2007-2017, 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_openssl.h"
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#include "compat.h"
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#include "testsupport.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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/* Opaque structure to hold an X509 certificate. */
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typedef struct tor_x509_cert_t tor_x509_cert_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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#ifdef TORTLS_PRIVATE
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#define TOR_TLS_MAGIC 0x71571571
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typedef enum {
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TOR_TLS_ST_HANDSHAKE, TOR_TLS_ST_OPEN, TOR_TLS_ST_GOTCLOSE,
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TOR_TLS_ST_SENTCLOSE, TOR_TLS_ST_CLOSED, TOR_TLS_ST_RENEGOTIATE,
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TOR_TLS_ST_BUFFEREVENT
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} tor_tls_state_t;
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#define tor_tls_state_bitfield_t ENUM_BF(tor_tls_state_t)
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struct x509_st;
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struct ssl_st;
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struct ssl_ctx_st;
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struct ssl_session_st;
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/** Holds a SSL_CTX object and related state used to configure TLS
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* connections.
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*/
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typedef struct tor_tls_context_t {
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int refcnt;
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struct ssl_ctx_st *ctx;
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tor_x509_cert_t *my_link_cert;
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tor_x509_cert_t *my_id_cert;
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tor_x509_cert_t *my_auth_cert;
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crypto_pk_t *link_key;
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crypto_pk_t *auth_key;
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} tor_tls_context_t;
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/** Structure that we use for a single certificate. */
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struct tor_x509_cert_t {
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struct x509_st *cert;
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uint8_t *encoded;
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size_t encoded_len;
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unsigned pkey_digests_set : 1;
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common_digests_t cert_digests;
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common_digests_t pkey_digests;
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};
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/** Holds a SSL object and its associated data. Members are only
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* accessed from within tortls.c.
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*/
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struct tor_tls_t {
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uint32_t magic;
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tor_tls_context_t *context; /** A link to the context object for this tls. */
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struct ssl_st *ssl; /**< An OpenSSL SSL object. */
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int socket; /**< The underlying file descriptor for this TLS connection. */
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char *address; /**< An address to log when describing this connection. */
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tor_tls_state_bitfield_t state : 3; /**< The current SSL state,
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* depending on which operations
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* have completed successfully. */
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unsigned int isServer:1; /**< True iff this is a server-side connection */
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unsigned int wasV2Handshake:1; /**< True iff the original handshake for
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* this connection used the updated version
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* of the connection protocol (client sends
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* different cipher list, server sends only
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* one certificate). */
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/** True iff we should call negotiated_callback when we're done reading. */
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unsigned int got_renegotiate:1;
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/** Return value from tor_tls_classify_client_ciphers, or 0 if we haven't
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* called that function yet. */
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int8_t client_cipher_list_type;
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/** Incremented every time we start the server side of a handshake. */
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uint8_t server_handshake_count;
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size_t wantwrite_n; /**< 0 normally, >0 if we returned wantwrite last
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* time. */
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/** Last values retrieved from BIO_number_read()/write(); see
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* tor_tls_get_n_raw_bytes() for usage.
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*/
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unsigned long last_write_count;
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unsigned long last_read_count;
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/** If set, a callback to invoke whenever the client tries to renegotiate
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* the handshake. */
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void (*negotiated_callback)(tor_tls_t *tls, void *arg);
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/** Argument to pass to negotiated_callback. */
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void *callback_arg;
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};
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STATIC int tor_errno_to_tls_error(int e);
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STATIC int tor_tls_get_error(tor_tls_t *tls, int r, int extra,
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const char *doing, int severity, int domain);
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STATIC tor_tls_t *tor_tls_get_by_ssl(const struct ssl_st *ssl);
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STATIC void tor_tls_allocate_tor_tls_object_ex_data_index(void);
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#ifdef TORTLS_OPENSSL_PRIVATE
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STATIC int always_accept_verify_cb(int preverify_ok, X509_STORE_CTX *x509_ctx);
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STATIC int tor_tls_classify_client_ciphers(const struct ssl_st *ssl,
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STACK_OF(SSL_CIPHER) *peer_ciphers);
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#endif
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STATIC int tor_tls_client_is_using_v2_ciphers(const struct ssl_st *ssl);
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MOCK_DECL(STATIC void, try_to_extract_certs_from_tls,
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(int severity, tor_tls_t *tls, struct x509_st **cert_out,
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struct x509_st **id_cert_out));
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#ifndef HAVE_SSL_SESSION_GET_MASTER_KEY
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STATIC size_t SSL_SESSION_get_master_key(struct ssl_session_st *s,
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uint8_t *out,
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size_t len);
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#endif
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STATIC void tor_tls_debug_state_callback(const struct ssl_st *ssl,
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int type, int val);
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STATIC void tor_tls_server_info_callback(const struct ssl_st *ssl,
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int type, int val);
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#ifdef TORTLS_OPENSSL_PRIVATE
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STATIC int tor_tls_session_secret_cb(struct ssl_st *ssl, void *secret,
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int *secret_len,
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STACK_OF(SSL_CIPHER) *peer_ciphers,
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CONST_IF_OPENSSL_1_1_API SSL_CIPHER **cipher,
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void *arg);
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STATIC int find_cipher_by_id(const SSL *ssl, const SSL_METHOD *m,
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uint16_t cipher);
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#endif
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MOCK_DECL(STATIC struct x509_st *, tor_tls_create_certificate,
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(crypto_pk_t *rsa,
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crypto_pk_t *rsa_sign,
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const char *cname,
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const char *cname_sign,
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unsigned int cert_lifetime));
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STATIC tor_tls_context_t *tor_tls_context_new(crypto_pk_t *identity,
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unsigned int key_lifetime, unsigned flags, int is_client);
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MOCK_DECL(STATIC tor_x509_cert_t *, tor_x509_cert_new,
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(struct x509_st *x509_cert));
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STATIC int tor_tls_context_init_one(tor_tls_context_t **ppcontext,
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crypto_pk_t *identity,
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unsigned int key_lifetime,
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unsigned int flags,
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int is_client);
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STATIC void tls_log_errors(tor_tls_t *tls, int severity, int domain,
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const char *doing);
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#ifdef TOR_UNIT_TESTS
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extern int tor_tls_object_ex_data_index;
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extern tor_tls_context_t *server_tls_context;
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extern tor_tls_context_t *client_tls_context;
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extern uint16_t v2_cipher_list[];
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extern uint64_t total_bytes_written_over_tls;
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extern uint64_t total_bytes_written_by_tls;
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STATIC tor_x509_cert_t *tor_x509_cert_replace_expiration(
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const tor_x509_cert_t *inp,
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time_t new_expiration_time,
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crypto_pk_t *signing_key);
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#endif
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#endif /* endif TORTLS_PRIVATE */
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tor_x509_cert_t *tor_x509_cert_dup(const tor_x509_cert_t *cert);
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const char *tor_tls_err_to_string(int err);
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void tor_tls_get_state_description(tor_tls_t *tls, char *buf, size_t sz);
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void tor_tls_free_all(void);
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#define TOR_TLS_CTX_IS_PUBLIC_SERVER (1u<<0)
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#define TOR_TLS_CTX_USE_ECDHE_P256 (1u<<1)
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#define TOR_TLS_CTX_USE_ECDHE_P224 (1u<<2)
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int tor_tls_context_init(unsigned flags,
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crypto_pk_t *client_identity,
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crypto_pk_t *server_identity,
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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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MOCK_DECL(tor_x509_cert_t *,tor_tls_get_peer_cert,(tor_tls_t *tls));
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MOCK_DECL(tor_x509_cert_t *,tor_tls_get_own_cert,(tor_tls_t *tls));
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int tor_tls_verify(int severity, tor_tls_t *tls, crypto_pk_t **identity);
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int tor_tls_check_lifetime(int severity,
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tor_tls_t *tls, time_t now,
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int past_tolerance,
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int future_tolerance);
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MOCK_DECL(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_finish_handshake(tor_tls_t *tls);
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void tor_tls_unblock_renegotiation(tor_tls_t *tls);
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void tor_tls_block_renegotiation(tor_tls_t *tls);
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void tor_tls_assert_renegotiation_unblocked(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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int 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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MOCK_DECL(double, tls_get_write_overhead_ratio, (void));
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int tor_tls_used_v1_handshake(tor_tls_t *tls);
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int tor_tls_get_num_server_handshakes(tor_tls_t *tls);
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int tor_tls_server_got_renegotiate(tor_tls_t *tls);
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MOCK_DECL(int,tor_tls_get_tlssecrets,(tor_tls_t *tls, uint8_t *secrets_out));
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MOCK_DECL(int,tor_tls_export_key_material,(
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tor_tls_t *tls, uint8_t *secrets_out,
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const uint8_t *context,
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size_t context_len,
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const char *label));
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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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void tor_tls_log_one_error(tor_tls_t *tls, unsigned long err,
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int severity, int domain, const char *doing);
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void tor_x509_cert_free(tor_x509_cert_t *cert);
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tor_x509_cert_t *tor_x509_cert_decode(const uint8_t *certificate,
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size_t certificate_len);
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void tor_x509_cert_get_der(const tor_x509_cert_t *cert,
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const uint8_t **encoded_out, size_t *size_out);
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const common_digests_t *tor_x509_cert_get_id_digests(
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const tor_x509_cert_t *cert);
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const common_digests_t *tor_x509_cert_get_cert_digests(
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const tor_x509_cert_t *cert);
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int tor_tls_get_my_certs(int server,
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const tor_x509_cert_t **link_cert_out,
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const tor_x509_cert_t **id_cert_out);
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crypto_pk_t *tor_tls_get_my_client_auth_key(void);
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crypto_pk_t *tor_tls_cert_get_key(tor_x509_cert_t *cert);
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MOCK_DECL(int,tor_tls_cert_matches_key,(const tor_tls_t *tls,
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const tor_x509_cert_t *cert));
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int tor_tls_cert_is_valid(int severity,
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const tor_x509_cert_t *cert,
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const tor_x509_cert_t *signing_cert,
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time_t now,
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int check_rsa_1024);
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const char *tor_tls_get_ciphersuite_name(tor_tls_t *tls);
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int evaluate_ecgroup_for_tls(const char *ecgroup);
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#endif
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