550 lines
18 KiB
C
550 lines
18 KiB
C
/**
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* \file ssl.h
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*
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* Copyright (C) 2006-2010, Paul Bakker <polarssl_maintainer at polarssl.org>
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef POLARSSL_SSL_H
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#define POLARSSL_SSL_H
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#include <time.h>
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#include "polarssl/net.h"
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#include "polarssl/dhm.h"
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#include "polarssl/rsa.h"
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#include "polarssl/md5.h"
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#include "polarssl/sha1.h"
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#include "polarssl/x509.h"
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/*
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* SSL Error codes
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*/
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#define POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE -0x1000
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#define POLARSSL_ERR_SSL_BAD_INPUT_DATA -0x1800
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#define POLARSSL_ERR_SSL_INVALID_MAC -0x2000
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#define POLARSSL_ERR_SSL_INVALID_RECORD -0x2800
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#define POLARSSL_ERR_SSL_INVALID_MODULUS_SIZE -0x3000
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#define POLARSSL_ERR_SSL_UNKNOWN_CIPHER -0x3800
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#define POLARSSL_ERR_SSL_NO_CIPHER_CHOSEN -0x4000
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#define POLARSSL_ERR_SSL_NO_SESSION_FOUND -0x4800
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#define POLARSSL_ERR_SSL_NO_CLIENT_CERTIFICATE -0x5000
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#define POLARSSL_ERR_SSL_CERTIFICATE_TOO_LARGE -0x5800
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#define POLARSSL_ERR_SSL_CERTIFICATE_REQUIRED -0x6000
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#define POLARSSL_ERR_SSL_PRIVATE_KEY_REQUIRED -0x6800
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#define POLARSSL_ERR_SSL_CA_CHAIN_REQUIRED -0x7000
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#define POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE -0x7800
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#define POLARSSL_ERR_SSL_FATAL_ALERT_MESSAGE -0x8000
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#define POLARSSL_ERR_SSL_PEER_VERIFY_FAILED -0x8800
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#define POLARSSL_ERR_SSL_PEER_CLOSE_NOTIFY -0x9000
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#define POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO -0x9800
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#define POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO -0xA000
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#define POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE -0xA800
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#define POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST -0xB000
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#define POLARSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE -0xB800
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#define POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO_DONE -0xC000
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#define POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE -0xC800
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#define POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY -0xD000
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#define POLARSSL_ERR_SSL_BAD_HS_CHANGE_CIPHER_SPEC -0xD800
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#define POLARSSL_ERR_SSL_BAD_HS_FINISHED -0xE000
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/*
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* Various constants
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*/
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#define SSL_MAJOR_VERSION_3 3
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#define SSL_MINOR_VERSION_0 0 /*!< SSL v3.0 */
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#define SSL_MINOR_VERSION_1 1 /*!< TLS v1.0 */
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#define SSL_MINOR_VERSION_2 2 /*!< TLS v1.1 */
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#define SSL_IS_CLIENT 0
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#define SSL_IS_SERVER 1
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#define SSL_COMPRESS_NULL 0
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#define SSL_VERIFY_NONE 0
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#define SSL_VERIFY_OPTIONAL 1
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#define SSL_VERIFY_REQUIRED 2
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#define SSL_MAX_CONTENT_LEN 16384
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/*
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* Allow an extra 512 bytes for the record header
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* and encryption overhead (counter + MAC + padding).
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*/
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#define SSL_BUFFER_LEN (SSL_MAX_CONTENT_LEN + 512)
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/*
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* Supported ciphersuites
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*/
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#define SSL_RSA_RC4_128_MD5 4
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#define SSL_RSA_RC4_128_SHA 5
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#define SSL_RSA_DES_168_SHA 10
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#define SSL_EDH_RSA_DES_168_SHA 22
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#define SSL_RSA_AES_128_SHA 47
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#define SSL_EDH_RSA_AES_128_SHA 51
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#define SSL_RSA_AES_256_SHA 53
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#define SSL_EDH_RSA_AES_256_SHA 57
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#define SSL_RSA_CAMELLIA_128_SHA 0x41
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#define SSL_EDH_RSA_CAMELLIA_128_SHA 0x45
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#define SSL_RSA_CAMELLIA_256_SHA 0x84
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#define SSL_EDH_RSA_CAMELLIA_256_SHA 0x88
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/*
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* Message, alert and handshake types
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*/
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#define SSL_MSG_CHANGE_CIPHER_SPEC 20
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#define SSL_MSG_ALERT 21
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#define SSL_MSG_HANDSHAKE 22
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#define SSL_MSG_APPLICATION_DATA 23
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#define SSL_ALERT_CLOSE_NOTIFY 0
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#define SSL_ALERT_WARNING 1
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#define SSL_ALERT_FATAL 2
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#define SSL_ALERT_NO_CERTIFICATE 41
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#define SSL_HS_HELLO_REQUEST 0
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#define SSL_HS_CLIENT_HELLO 1
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#define SSL_HS_SERVER_HELLO 2
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#define SSL_HS_CERTIFICATE 11
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#define SSL_HS_SERVER_KEY_EXCHANGE 12
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#define SSL_HS_CERTIFICATE_REQUEST 13
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#define SSL_HS_SERVER_HELLO_DONE 14
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#define SSL_HS_CERTIFICATE_VERIFY 15
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#define SSL_HS_CLIENT_KEY_EXCHANGE 16
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#define SSL_HS_FINISHED 20
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/*
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* TLS extensions
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*/
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#define TLS_EXT_SERVERNAME 0
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#define TLS_EXT_SERVERNAME_HOSTNAME 0
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/*
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* SSL state machine
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*/
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typedef enum
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{
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SSL_HELLO_REQUEST,
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SSL_CLIENT_HELLO,
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SSL_SERVER_HELLO,
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SSL_SERVER_CERTIFICATE,
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SSL_SERVER_KEY_EXCHANGE,
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SSL_CERTIFICATE_REQUEST,
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SSL_SERVER_HELLO_DONE,
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SSL_CLIENT_CERTIFICATE,
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SSL_CLIENT_KEY_EXCHANGE,
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SSL_CERTIFICATE_VERIFY,
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SSL_CLIENT_CHANGE_CIPHER_SPEC,
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SSL_CLIENT_FINISHED,
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SSL_SERVER_CHANGE_CIPHER_SPEC,
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SSL_SERVER_FINISHED,
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SSL_FLUSH_BUFFERS,
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SSL_HANDSHAKE_OVER
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}
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ssl_states;
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typedef struct _ssl_session ssl_session;
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typedef struct _ssl_context ssl_context;
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/*
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* This structure is used for session resuming.
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*/
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struct _ssl_session
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{
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time_t start; /*!< starting time */
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int cipher; /*!< chosen cipher */
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int length; /*!< session id length */
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unsigned char id[32]; /*!< session identifier */
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unsigned char master[48]; /*!< the master secret */
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ssl_session *next; /*!< next session entry */
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};
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struct _ssl_context
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{
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/*
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* Miscellaneous
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*/
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int state; /*!< SSL handshake: current state */
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int major_ver; /*!< equal to SSL_MAJOR_VERSION_3 */
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int minor_ver; /*!< either 0 (SSL3) or 1 (TLS1.0) */
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int max_major_ver; /*!< max. major version from client */
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int max_minor_ver; /*!< max. minor version from client */
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/*
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* Callbacks (RNG, debug, I/O)
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*/
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int (*f_rng)(void *);
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void (*f_dbg)(void *, int, const char *);
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int (*f_recv)(void *, unsigned char *, int);
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int (*f_send)(void *, unsigned char *, int);
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void *p_rng; /*!< context for the RNG function */
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void *p_dbg; /*!< context for the debug function */
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void *p_recv; /*!< context for reading operations */
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void *p_send; /*!< context for writing operations */
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/*
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* Session layer
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*/
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int resume; /*!< session resuming flag */
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int timeout; /*!< sess. expiration time */
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ssl_session *session; /*!< current session data */
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int (*s_get)(ssl_context *); /*!< (server) get callback */
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int (*s_set)(ssl_context *); /*!< (server) set callback */
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/*
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* Record layer (incoming data)
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*/
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unsigned char *in_ctr; /*!< 64-bit incoming message counter */
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unsigned char *in_hdr; /*!< 5-byte record header (in_ctr+8) */
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unsigned char *in_msg; /*!< the message contents (in_hdr+5) */
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unsigned char *in_offt; /*!< read offset in application data */
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int in_msgtype; /*!< record header: message type */
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int in_msglen; /*!< record header: message length */
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int in_left; /*!< amount of data read so far */
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int in_hslen; /*!< current handshake message length */
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int nb_zero; /*!< # of 0-length encrypted messages */
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/*
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* Record layer (outgoing data)
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*/
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unsigned char *out_ctr; /*!< 64-bit outgoing message counter */
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unsigned char *out_hdr; /*!< 5-byte record header (out_ctr+8) */
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unsigned char *out_msg; /*!< the message contents (out_hdr+5) */
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int out_msgtype; /*!< record header: message type */
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int out_msglen; /*!< record header: message length */
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int out_left; /*!< amount of data not yet written */
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/*
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* PKI layer
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*/
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rsa_context *rsa_key; /*!< own RSA private key */
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x509_cert *own_cert; /*!< own X.509 certificate */
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x509_cert *ca_chain; /*!< own trusted CA chain */
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x509_crl *ca_crl; /*!< trusted CA CRLs */
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x509_cert *peer_cert; /*!< peer X.509 cert chain */
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const char *peer_cn; /*!< expected peer CN */
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int endpoint; /*!< 0: client, 1: server */
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int authmode; /*!< verification mode */
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int client_auth; /*!< flag for client auth. */
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int verify_result; /*!< verification result */
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/*
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* Crypto layer
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*/
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dhm_context dhm_ctx; /*!< DHM key exchange */
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md5_context fin_md5; /*!< Finished MD5 checksum */
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sha1_context fin_sha1; /*!< Finished SHA-1 checksum */
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int do_crypt; /*!< en(de)cryption flag */
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int *ciphers; /*!< allowed ciphersuites */
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int pmslen; /*!< premaster length */
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int keylen; /*!< symmetric key length */
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int minlen; /*!< min. ciphertext length */
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int ivlen; /*!< IV length */
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int maclen; /*!< MAC length */
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unsigned char randbytes[64]; /*!< random bytes */
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unsigned char premaster[256]; /*!< premaster secret */
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unsigned char iv_enc[16]; /*!< IV (encryption) */
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unsigned char iv_dec[16]; /*!< IV (decryption) */
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unsigned char mac_enc[32]; /*!< MAC (encryption) */
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unsigned char mac_dec[32]; /*!< MAC (decryption) */
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unsigned long ctx_enc[128]; /*!< encryption context */
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unsigned long ctx_dec[128]; /*!< decryption context */
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/*
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* TLS extensions
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*/
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unsigned char *hostname;
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unsigned long hostname_len;
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};
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern int ssl_default_ciphers[];
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/**
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* \brief Initialize an SSL context
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*
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* \param ssl SSL context
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*
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* \return 0 if successful, or 1 if memory allocation failed
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*/
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int ssl_init( ssl_context *ssl );
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/**
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* \brief Set the current endpoint type
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*
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* \param ssl SSL context
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* \param endpoint must be SSL_IS_CLIENT or SSL_IS_SERVER
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*/
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void ssl_set_endpoint( ssl_context *ssl, int endpoint );
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/**
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* \brief Set the certificate verification mode
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*
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* \param ssl SSL context
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* \param mode can be:
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*
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* SSL_VERIFY_NONE: peer certificate is not checked (default),
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* this is insecure and SHOULD be avoided.
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*
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* SSL_VERIFY_OPTIONAL: peer certificate is checked, however the
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* handshake continues even if verification failed;
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* ssl_get_verify_result() can be called after the
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* handshake is complete.
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*
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* SSL_VERIFY_REQUIRED: peer *must* present a valid certificate,
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* handshake is aborted if verification failed.
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*/
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void ssl_set_authmode( ssl_context *ssl, int authmode );
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/**
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* \brief Set the random number generator callback
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*
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* \param ssl SSL context
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* \param f_rng RNG function
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* \param p_rng RNG parameter
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*/
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void ssl_set_rng( ssl_context *ssl,
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int (*f_rng)(void *),
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void *p_rng );
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/**
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* \brief Set the debug callback
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*
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* \param ssl SSL context
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* \param f_dbg debug function
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* \param p_dbg debug parameter
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*/
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void ssl_set_dbg( ssl_context *ssl,
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void (*f_dbg)(void *, int, const char *),
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void *p_dbg );
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/**
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* \brief Set the underlying BIO read and write callbacks
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*
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* \param ssl SSL context
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* \param f_recv read callback
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* \param p_recv read parameter
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* \param f_send write callback
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* \param p_send write parameter
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*/
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void ssl_set_bio( ssl_context *ssl,
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int (*f_recv)(void *, unsigned char *, int), void *p_recv,
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int (*f_send)(void *, unsigned char *, int), void *p_send );
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/**
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* \brief Set the session callbacks (server-side only)
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*
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* \param ssl SSL context
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* \param s_get session get callback
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* \param s_set session set callback
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*/
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void ssl_set_scb( ssl_context *ssl,
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int (*s_get)(ssl_context *),
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int (*s_set)(ssl_context *) );
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/**
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* \brief Set the session resuming flag, timeout and data
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*
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* \param ssl SSL context
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* \param resume if 0 (default), the session will not be resumed
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* \param timeout session timeout in seconds, or 0 (no timeout)
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* \param session session context
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*/
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void ssl_set_session( ssl_context *ssl, int resume, int timeout,
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ssl_session *session );
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/**
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* \brief Set the list of allowed ciphersuites
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*
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* \param ssl SSL context
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* \param ciphers 0-terminated list of allowed ciphers
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*/
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void ssl_set_ciphers( ssl_context *ssl, int *ciphers );
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/**
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* \brief Set the data required to verify peer certificate
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*
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* \param ssl SSL context
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* \param ca_chain trusted CA chain
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* \param ca_crl trusted CA CRLs
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* \param peer_cn expected peer CommonName (or NULL)
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*
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* \note TODO: add two more parameters: depth and crl
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*/
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void ssl_set_ca_chain( ssl_context *ssl, x509_cert *ca_chain,
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x509_crl *ca_crl, const char *peer_cn );
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/**
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* \brief Set own certificate and private key
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*
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* \param ssl SSL context
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* \param own_cert own public certificate
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* \param rsa_key own private RSA key
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*/
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void ssl_set_own_cert( ssl_context *ssl, x509_cert *own_cert,
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rsa_context *rsa_key );
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/**
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* \brief Set the Diffie-Hellman public P and G values,
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* read as hexadecimal strings (server-side only)
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*
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* \param ssl SSL context
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* \param dhm_P Diffie-Hellman-Merkle modulus
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* \param dhm_G Diffie-Hellman-Merkle generator
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*
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* \return 0 if successful
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*/
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int ssl_set_dh_param( ssl_context *ssl, const char *dhm_P, const char *dhm_G );
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/**
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* \brief Set hostname for ServerName TLS Extension
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*
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*
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* \param ssl SSL context
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* \param hostname the server hostname
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*
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* \return 0 if successful
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*/
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int ssl_set_hostname( ssl_context *ssl, const char *hostname );
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/**
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* \brief Return the number of data bytes available to read
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*
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* \param ssl SSL context
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*
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* \return how many bytes are available in the read buffer
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*/
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int ssl_get_bytes_avail( const ssl_context *ssl );
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/**
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* \brief Return the result of the certificate verification
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*
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* \param ssl SSL context
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*
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* \return 0 if successful, or a combination of:
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* BADCERT_EXPIRED
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* BADCERT_REVOKED
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* BADCERT_CN_MISMATCH
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* BADCERT_NOT_TRUSTED
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*/
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int ssl_get_verify_result( const ssl_context *ssl );
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/**
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* \brief Return the name of the current cipher
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*
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* \param ssl SSL context
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*
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* \return a string containing the cipher name
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*/
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const char *ssl_get_cipher( const ssl_context *ssl );
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/**
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* \brief Perform the SSL handshake
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*
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* \param ssl SSL context
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*
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* \return 0 if successful, POLARSSL_ERR_NET_TRY_AGAIN,
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* or a specific SSL error code.
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*/
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int ssl_handshake( ssl_context *ssl );
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/**
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* \brief Read at most 'len' application data bytes
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*
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* \param ssl SSL context
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* \param buf buffer that will hold the data
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* \param len how many bytes must be read
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*
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* \return This function returns the number of bytes read,
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* or a negative error code.
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*/
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int ssl_read( ssl_context *ssl, unsigned char *buf, int len );
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/**
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* \brief Write exactly 'len' application data bytes
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*
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* \param ssl SSL context
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* \param buf buffer holding the data
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* \param len how many bytes must be written
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*
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* \return This function returns the number of bytes written,
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* or a negative error code.
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*
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* \note When this function returns POLARSSL_ERR_NET_TRY_AGAIN,
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* it must be called later with the *same* arguments,
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* until it returns a positive value.
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*/
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int ssl_write( ssl_context *ssl, const unsigned char *buf, int len );
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/**
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* \brief Notify the peer that the connection is being closed
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*
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* \param ssl SSL context
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*/
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int ssl_close_notify( ssl_context *ssl );
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/**
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* \brief Free an SSL context
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*
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* \param ssl SSL context
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*/
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void ssl_free( ssl_context *ssl );
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/*
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* Internal functions (do not call directly)
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*/
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int ssl_handshake_client( ssl_context *ssl );
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int ssl_handshake_server( ssl_context *ssl );
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int ssl_derive_keys( ssl_context *ssl );
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void ssl_calc_verify( ssl_context *ssl, unsigned char hash[36] );
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int ssl_read_record( ssl_context *ssl );
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int ssl_fetch_input( ssl_context *ssl, int nb_want );
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int ssl_write_record( ssl_context *ssl );
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int ssl_flush_output( ssl_context *ssl );
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int ssl_parse_certificate( ssl_context *ssl );
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int ssl_write_certificate( ssl_context *ssl );
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int ssl_parse_change_cipher_spec( ssl_context *ssl );
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int ssl_write_change_cipher_spec( ssl_context *ssl );
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int ssl_parse_finished( ssl_context *ssl );
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int ssl_write_finished( ssl_context *ssl );
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#ifdef __cplusplus
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}
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#endif
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#endif /* ssl.h */
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