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/**
* \file ssl.h
*
* \brief SSL/TLS functions.
*
* Copyright (C) 2006-2014, ARM Limited, All Rights Reserved
*
* This file is part of mbed TLS (https://tls.mbed.org)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef POLARSSL_SSL_H
#define POLARSSL_SSL_H
#if !defined(POLARSSL_CONFIG_FILE)
#include "config.h"
#else
#include POLARSSL_CONFIG_FILE
#endif
/* Temporary compatibility trick for the current stable branch */
#if !defined(POLARSSL_SSL_DISABLE_RENEGOTIATION)
#define POLARSSL_SSL_RENEGOTIATION
#endif
#include "net.h"
#include "bignum.h"
#include "ecp.h"
#include "ssl_ciphersuites.h"
#if defined(POLARSSL_MD5_C)
#include "md5.h"
#endif
#if defined(POLARSSL_SHA1_C)
#include "sha1.h"
#endif
#if defined(POLARSSL_SHA256_C)
#include "sha256.h"
#endif
#if defined(POLARSSL_SHA512_C)
#include "sha512.h"
#endif
// for session tickets
#if defined(POLARSSL_AES_C)
#include "aes.h"
#endif
#if defined(POLARSSL_X509_CRT_PARSE_C)
#include "x509_crt.h"
#include "x509_crl.h"
#endif
#if defined(POLARSSL_DHM_C)
#include "dhm.h"
#endif
#if defined(POLARSSL_ECDH_C)
#include "ecdh.h"
#endif
#if defined(POLARSSL_ZLIB_SUPPORT)
#include "zlib.h"
#endif
#if defined(POLARSSL_SSL_PROTO_DTLS)
#include "timing.h"
#endif
#if defined(POLARSSL_HAVE_TIME)
#include <time.h>
#endif
/* For convenience below and in programs */
#if defined(POLARSSL_KEY_EXCHANGE_PSK_ENABLED) || \
defined(POLARSSL_KEY_EXCHANGE_RSA_PSK_ENABLED) || \
defined(POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED) || \
defined(POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
#define POLARSSL_KEY_EXCHANGE__SOME__PSK_ENABLED
#endif
#if defined(POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \
defined(POLARSSL_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) || \
defined(POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
#define POLARSSL_KEY_EXCHANGE__SOME__ECDHE_ENABLED
#endif
#if defined(_MSC_VER) && !defined(inline)
#define inline _inline
#else
#if defined(__ARMCC_VERSION) && !defined(inline)
#define inline __inline
#endif /* __ARMCC_VERSION */
#endif /*_MSC_VER */
/*
* SSL Error codes
*/
#define POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE -0x7080 /**< The requested feature is not available. */
#define POLARSSL_ERR_SSL_BAD_INPUT_DATA -0x7100 /**< Bad input parameters to function. */
#define POLARSSL_ERR_SSL_INVALID_MAC -0x7180 /**< Verification of the message MAC failed. */
#define POLARSSL_ERR_SSL_INVALID_RECORD -0x7200 /**< An invalid SSL record was received. */
#define POLARSSL_ERR_SSL_CONN_EOF -0x7280 /**< The connection indicated an EOF. */
#define POLARSSL_ERR_SSL_UNKNOWN_CIPHER -0x7300 /**< An unknown cipher was received. */
#define POLARSSL_ERR_SSL_NO_CIPHER_CHOSEN -0x7380 /**< The server has no ciphersuites in common with the client. */
#define POLARSSL_ERR_SSL_NO_RNG -0x7400 /**< No RNG was provided to the SSL module. */
#define POLARSSL_ERR_SSL_NO_CLIENT_CERTIFICATE -0x7480 /**< No client certification received from the client, but required by the authentication mode. */
#define POLARSSL_ERR_SSL_CERTIFICATE_TOO_LARGE -0x7500 /**< Our own certificate(s) is/are too large to send in an SSL message. */
#define POLARSSL_ERR_SSL_CERTIFICATE_REQUIRED -0x7580 /**< The own certificate is not set, but needed by the server. */
#define POLARSSL_ERR_SSL_PRIVATE_KEY_REQUIRED -0x7600 /**< The own private key or pre-shared key is not set, but needed. */
#define POLARSSL_ERR_SSL_CA_CHAIN_REQUIRED -0x7680 /**< No CA Chain is set, but required to operate. */
#define POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE -0x7700 /**< An unexpected message was received from our peer. */
#define POLARSSL_ERR_SSL_FATAL_ALERT_MESSAGE -0x7780 /**< A fatal alert message was received from our peer. */
#define POLARSSL_ERR_SSL_PEER_VERIFY_FAILED -0x7800 /**< Verification of our peer failed. */
#define POLARSSL_ERR_SSL_PEER_CLOSE_NOTIFY -0x7880 /**< The peer notified us that the connection is going to be closed. */
#define POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO -0x7900 /**< Processing of the ClientHello handshake message failed. */
#define POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO -0x7980 /**< Processing of the ServerHello handshake message failed. */
#define POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE -0x7A00 /**< Processing of the Certificate handshake message failed. */
#define POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST -0x7A80 /**< Processing of the CertificateRequest handshake message failed. */
#define POLARSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE -0x7B00 /**< Processing of the ServerKeyExchange handshake message failed. */
#define POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO_DONE -0x7B80 /**< Processing of the ServerHelloDone handshake message failed. */
#define POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE -0x7C00 /**< Processing of the ClientKeyExchange handshake message failed. */
#define POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_RP -0x7C80 /**< Processing of the ClientKeyExchange handshake message failed in DHM / ECDH Read Public. */
#define POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_CS -0x7D00 /**< Processing of the ClientKeyExchange handshake message failed in DHM / ECDH Calculate Secret. */
#define POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY -0x7D80 /**< Processing of the CertificateVerify handshake message failed. */
#define POLARSSL_ERR_SSL_BAD_HS_CHANGE_CIPHER_SPEC -0x7E00 /**< Processing of the ChangeCipherSpec handshake message failed. */
#define POLARSSL_ERR_SSL_BAD_HS_FINISHED -0x7E80 /**< Processing of the Finished handshake message failed. */
#define POLARSSL_ERR_SSL_MALLOC_FAILED -0x7F00 /**< Memory allocation failed */
#define POLARSSL_ERR_SSL_HW_ACCEL_FAILED -0x7F80 /**< Hardware acceleration function returned with error */
#define POLARSSL_ERR_SSL_HW_ACCEL_FALLTHROUGH -0x6F80 /**< Hardware acceleration function skipped / left alone data */
#define POLARSSL_ERR_SSL_COMPRESSION_FAILED -0x6F00 /**< Processing of the compression / decompression failed */
#define POLARSSL_ERR_SSL_BAD_HS_PROTOCOL_VERSION -0x6E80 /**< Handshake protocol not within min/max boundaries */
#define POLARSSL_ERR_SSL_BAD_HS_NEW_SESSION_TICKET -0x6E00 /**< Processing of the NewSessionTicket handshake message failed. */
#define POLARSSL_ERR_SSL_SESSION_TICKET_EXPIRED -0x6D80 /**< Session ticket has expired. */
#define POLARSSL_ERR_SSL_PK_TYPE_MISMATCH -0x6D00 /**< Public key type mismatch (eg, asked for RSA key exchange and presented EC key) */
#define POLARSSL_ERR_SSL_UNKNOWN_IDENTITY -0x6C80 /**< Unknown identity received (eg, PSK identity) */
#define POLARSSL_ERR_SSL_INTERNAL_ERROR -0x6C00 /**< Internal error (eg, unexpected failure in lower-level module) */
#define POLARSSL_ERR_SSL_COUNTER_WRAPPING -0x6B80 /**< A counter would wrap (eg, too many messages exchanged). */
#define POLARSSL_ERR_SSL_WAITING_SERVER_HELLO_RENEGO -0x6B00 /**< Unexpected message at ServerHello in renegotiation. */
#define POLARSSL_ERR_SSL_HELLO_VERIFY_REQUIRED -0x6A80 /**< DTLS client must retry for hello verification */
#define POLARSSL_ERR_SSL_BUFFER_TOO_SMALL -0x6A00 /**< A buffer is too small to receive or write a message */
#define POLARSSL_ERR_SSL_NO_USABLE_CIPHERSUITE -0x6980 /**< None of the common ciphersuites is usable (eg, no suitable certificate, see debug messages). */
/*
* Various constants
*/
#define SSL_MAJOR_VERSION_3 3
#define SSL_MINOR_VERSION_0 0 /*!< SSL v3.0 */
#define SSL_MINOR_VERSION_1 1 /*!< TLS v1.0 */
#define SSL_MINOR_VERSION_2 2 /*!< TLS v1.1 */
#define SSL_MINOR_VERSION_3 3 /*!< TLS v1.2 */
#define SSL_TRANSPORT_STREAM 0 /*!< TLS */
#define SSL_TRANSPORT_DATAGRAM 1 /*!< DTLS */
/* Determine minimum supported version */
#define SSL_MIN_MAJOR_VERSION SSL_MAJOR_VERSION_3
#if defined(POLARSSL_SSL_PROTO_SSL3)
#define SSL_MIN_MINOR_VERSION SSL_MINOR_VERSION_0
#else
#if defined(POLARSSL_SSL_PROTO_TLS1)
#define SSL_MIN_MINOR_VERSION SSL_MINOR_VERSION_1
#else
#if defined(POLARSSL_SSL_PROTO_TLS1_1)
#define SSL_MIN_MINOR_VERSION SSL_MINOR_VERSION_2
#else
#if defined(POLARSSL_SSL_PROTO_TLS1_2)
#define SSL_MIN_MINOR_VERSION SSL_MINOR_VERSION_3
#endif /* POLARSSL_SSL_PROTO_TLS1_2 */
#endif /* POLARSSL_SSL_PROTO_TLS1_1 */
#endif /* POLARSSL_SSL_PROTO_TLS1 */
#endif /* POLARSSL_SSL_PROTO_SSL3 */
/* Determine maximum supported version */
#define SSL_MAX_MAJOR_VERSION SSL_MAJOR_VERSION_3
#if defined(POLARSSL_SSL_PROTO_TLS1_2)
#define SSL_MAX_MINOR_VERSION SSL_MINOR_VERSION_3
#else
#if defined(POLARSSL_SSL_PROTO_TLS1_1)
#define SSL_MAX_MINOR_VERSION SSL_MINOR_VERSION_2
#else
#if defined(POLARSSL_SSL_PROTO_TLS1)
#define SSL_MAX_MINOR_VERSION SSL_MINOR_VERSION_1
#else
#if defined(POLARSSL_SSL_PROTO_SSL3)
#define SSL_MAX_MINOR_VERSION SSL_MINOR_VERSION_0
#endif /* POLARSSL_SSL_PROTO_SSL3 */
#endif /* POLARSSL_SSL_PROTO_TLS1 */
#endif /* POLARSSL_SSL_PROTO_TLS1_1 */
#endif /* POLARSSL_SSL_PROTO_TLS1_2 */
/* RFC 6066 section 4, see also mfl_code_to_length in ssl_tls.c
* NONE must be zero so that memset()ing structure to zero works */
#define SSL_MAX_FRAG_LEN_NONE 0 /*!< don't use this extension */
#define SSL_MAX_FRAG_LEN_512 1 /*!< MaxFragmentLength 2^9 */
#define SSL_MAX_FRAG_LEN_1024 2 /*!< MaxFragmentLength 2^10 */
#define SSL_MAX_FRAG_LEN_2048 3 /*!< MaxFragmentLength 2^11 */
#define SSL_MAX_FRAG_LEN_4096 4 /*!< MaxFragmentLength 2^12 */
#define SSL_MAX_FRAG_LEN_INVALID 5 /*!< first invalid value */
#define SSL_IS_CLIENT 0
#define SSL_IS_SERVER 1
#define SSL_IS_NOT_FALLBACK 0
#define SSL_IS_FALLBACK 1
#define SSL_EXTENDED_MS_DISABLED 0
#define SSL_EXTENDED_MS_ENABLED 1
#define SSL_ETM_DISABLED 0
#define SSL_ETM_ENABLED 1
#define SSL_COMPRESS_NULL 0
#define SSL_COMPRESS_DEFLATE 1
#define SSL_VERIFY_NONE 0
#define SSL_VERIFY_OPTIONAL 1
#define SSL_VERIFY_REQUIRED 2
#define SSL_INITIAL_HANDSHAKE 0
#define SSL_RENEGOTIATION_IN_PROGRESS 1 /* In progress */
#define SSL_RENEGOTIATION_DONE 2 /* Done or aborted */
#define SSL_RENEGOTIATION_PENDING 3 /* Requested (server only) */
#define SSL_LEGACY_RENEGOTIATION 0
#define SSL_SECURE_RENEGOTIATION 1
#define SSL_RENEGOTIATION_DISABLED 0
#define SSL_RENEGOTIATION_ENABLED 1
#define SSL_ANTI_REPLAY_DISABLED 0
#define SSL_ANTI_REPLAY_ENABLED 1
#define SSL_RENEGOTIATION_NOT_ENFORCED -1
#define SSL_RENEGO_MAX_RECORDS_DEFAULT 16
#define SSL_LEGACY_NO_RENEGOTIATION 0
#define SSL_LEGACY_ALLOW_RENEGOTIATION 1
#define SSL_LEGACY_BREAK_HANDSHAKE 2
#define SSL_TRUNC_HMAC_DISABLED 0
#define SSL_TRUNC_HMAC_ENABLED 1
#define SSL_TRUNCATED_HMAC_LEN 10 /* 80 bits, rfc 6066 section 7 */
#define SSL_SESSION_TICKETS_DISABLED 0
#define SSL_SESSION_TICKETS_ENABLED 1
#define SSL_CBC_RECORD_SPLITTING_DISABLED -1
#define SSL_CBC_RECORD_SPLITTING_ENABLED 0
#define SSL_ARC4_ENABLED 0
#define SSL_ARC4_DISABLED 1
/*
* DTLS retransmission states, see RFC 6347 4.2.4
*
* The SENDING state is merged in PREPARING for initial sends,
* but is distinct for resends.
*
* Note: initial state is wrong for server, but is not used anyway.
*/
#define SSL_RETRANS_PREPARING 0
#define SSL_RETRANS_SENDING 1
#define SSL_RETRANS_WAITING 2
#define SSL_RETRANS_FINISHED 3
/*
* Default range for DTLS retransmission timer value, in milliseconds.
* RFC 6347 4.2.4.1 says from 1 second to 60 seconds.
*/
#define SSL_DTLS_TIMEOUT_DFL_MIN 1000
#define SSL_DTLS_TIMEOUT_DFL_MAX 60000
/**
* \name SECTION: Module settings
*
* The configuration options you can set for this module are in this section.
* Either change them in config.h or define them on the compiler command line.
* \{
*/
#if !defined(SSL_DEFAULT_TICKET_LIFETIME)
#define SSL_DEFAULT_TICKET_LIFETIME 86400 /**< Lifetime of session tickets (if enabled) */
#endif
/*
* Size of the input / output buffer.
* Note: the RFC defines the default size of SSL / TLS messages. If you
* change the value here, other clients / servers may not be able to
* communicate with you anymore. Only change this value if you control
* both sides of the connection and have it reduced at both sides, or
* if you're using the Max Fragment Length extension and you know all your
* peers are using it too!
*/
#if !defined(SSL_MAX_CONTENT_LEN)
#define SSL_MAX_CONTENT_LEN 16384 /**< Size of the input / output buffer */
#endif
/* \} name SECTION: Module settings */
/*
* Allow extra bytes for record, authentication and encryption overhead:
* counter (8) + header (5) + IV(16) + MAC (16-48) + padding (0-256)
* and allow for a maximum of 1024 of compression expansion if
* enabled.
*/
#if defined(POLARSSL_ZLIB_SUPPORT)
#define SSL_COMPRESSION_ADD 1024
#else
#define SSL_COMPRESSION_ADD 0
#endif
#if defined(POLARSSL_ARC4_C) || defined(POLARSSL_CIPHER_MODE_CBC)
/* Ciphersuites using HMAC */
#if defined(POLARSSL_SHA512_C)
#define SSL_MAC_ADD 48 /* SHA-384 used for HMAC */
#elif defined(POLARSSL_SHA256_C)
#define SSL_MAC_ADD 32 /* SHA-256 used for HMAC */
#else
#define SSL_MAC_ADD 20 /* SHA-1 used for HMAC */
#endif
#else
/* AEAD ciphersuites: GCM and CCM use a 128 bits tag */
#define SSL_MAC_ADD 16
#endif
#if defined(POLARSSL_CIPHER_MODE_CBC)
#define SSL_PADDING_ADD 256
#else
#define SSL_PADDING_ADD 0
#endif
#define SSL_BUFFER_LEN ( SSL_MAX_CONTENT_LEN \
+ SSL_COMPRESSION_ADD \
+ 29 /* counter + header + IV */ \
+ SSL_MAC_ADD \
+ SSL_PADDING_ADD \
)
/*
* Length of the verify data for secure renegotiation
*/
#if defined(POLARSSL_SSL_PROTO_SSL3)
#define SSL_VERIFY_DATA_MAX_LEN 36
#else
#define SSL_VERIFY_DATA_MAX_LEN 12
#endif
/*
* Signaling ciphersuite values (SCSV)
*/
#define SSL_EMPTY_RENEGOTIATION_INFO 0xFF /**< renegotiation info ext */
#define SSL_FALLBACK_SCSV_VALUE 0x5600 /**< draft-ietf-tls-downgrade-scsv-00 */
/*
* Supported Signature and Hash algorithms (For TLS 1.2)
* RFC 5246 section 7.4.1.4.1
*/
#define SSL_HASH_NONE 0
#define SSL_HASH_MD5 1
#define SSL_HASH_SHA1 2
#define SSL_HASH_SHA224 3
#define SSL_HASH_SHA256 4
#define SSL_HASH_SHA384 5
#define SSL_HASH_SHA512 6
#define SSL_SIG_ANON 0
#define SSL_SIG_RSA 1
#define SSL_SIG_ECDSA 3
/*
* Client Certificate Types
* RFC 5246 section 7.4.4 plus RFC 4492 section 5.5
*/
#define SSL_CERT_TYPE_RSA_SIGN 1
#define SSL_CERT_TYPE_ECDSA_SIGN 64
/*
* Message, alert and handshake types
*/
#define SSL_MSG_CHANGE_CIPHER_SPEC 20
#define SSL_MSG_ALERT 21
#define SSL_MSG_HANDSHAKE 22
#define SSL_MSG_APPLICATION_DATA 23
#define SSL_ALERT_LEVEL_WARNING 1
#define SSL_ALERT_LEVEL_FATAL 2
#define SSL_ALERT_MSG_CLOSE_NOTIFY 0 /* 0x00 */
#define SSL_ALERT_MSG_UNEXPECTED_MESSAGE 10 /* 0x0A */
#define SSL_ALERT_MSG_BAD_RECORD_MAC 20 /* 0x14 */
#define SSL_ALERT_MSG_DECRYPTION_FAILED 21 /* 0x15 */
#define SSL_ALERT_MSG_RECORD_OVERFLOW 22 /* 0x16 */
#define SSL_ALERT_MSG_DECOMPRESSION_FAILURE 30 /* 0x1E */
#define SSL_ALERT_MSG_HANDSHAKE_FAILURE 40 /* 0x28 */
#define SSL_ALERT_MSG_NO_CERT 41 /* 0x29 */
#define SSL_ALERT_MSG_BAD_CERT 42 /* 0x2A */
#define SSL_ALERT_MSG_UNSUPPORTED_CERT 43 /* 0x2B */
#define SSL_ALERT_MSG_CERT_REVOKED 44 /* 0x2C */
#define SSL_ALERT_MSG_CERT_EXPIRED 45 /* 0x2D */
#define SSL_ALERT_MSG_CERT_UNKNOWN 46 /* 0x2E */
#define SSL_ALERT_MSG_ILLEGAL_PARAMETER 47 /* 0x2F */
#define SSL_ALERT_MSG_UNKNOWN_CA 48 /* 0x30 */
#define SSL_ALERT_MSG_ACCESS_DENIED 49 /* 0x31 */
#define SSL_ALERT_MSG_DECODE_ERROR 50 /* 0x32 */
#define SSL_ALERT_MSG_DECRYPT_ERROR 51 /* 0x33 */
#define SSL_ALERT_MSG_EXPORT_RESTRICTION 60 /* 0x3C */
#define SSL_ALERT_MSG_PROTOCOL_VERSION 70 /* 0x46 */
#define SSL_ALERT_MSG_INSUFFICIENT_SECURITY 71 /* 0x47 */
#define SSL_ALERT_MSG_INTERNAL_ERROR 80 /* 0x50 */
#define SSL_ALERT_MSG_INAPROPRIATE_FALLBACK 86 /* 0x56 */
#define SSL_ALERT_MSG_USER_CANCELED 90 /* 0x5A */
#define SSL_ALERT_MSG_NO_RENEGOTIATION 100 /* 0x64 */
#define SSL_ALERT_MSG_UNSUPPORTED_EXT 110 /* 0x6E */
#define SSL_ALERT_MSG_UNRECOGNIZED_NAME 112 /* 0x70 */
#define SSL_ALERT_MSG_UNKNOWN_PSK_IDENTITY 115 /* 0x73 */
#define SSL_ALERT_MSG_NO_APPLICATION_PROTOCOL 120 /* 0x78 */
#define SSL_HS_HELLO_REQUEST 0
#define SSL_HS_CLIENT_HELLO 1
#define SSL_HS_SERVER_HELLO 2
#define SSL_HS_HELLO_VERIFY_REQUEST 3
#define SSL_HS_NEW_SESSION_TICKET 4
#define SSL_HS_CERTIFICATE 11
#define SSL_HS_SERVER_KEY_EXCHANGE 12
#define SSL_HS_CERTIFICATE_REQUEST 13
#define SSL_HS_SERVER_HELLO_DONE 14
#define SSL_HS_CERTIFICATE_VERIFY 15
#define SSL_HS_CLIENT_KEY_EXCHANGE 16
#define SSL_HS_FINISHED 20
/*
* TLS extensions
*/
#define TLS_EXT_SERVERNAME 0
#define TLS_EXT_SERVERNAME_HOSTNAME 0
#define TLS_EXT_MAX_FRAGMENT_LENGTH 1
#define TLS_EXT_TRUNCATED_HMAC 4
#define TLS_EXT_SUPPORTED_ELLIPTIC_CURVES 10
#define TLS_EXT_SUPPORTED_POINT_FORMATS 11
#define TLS_EXT_SIG_ALG 13
#define TLS_EXT_ALPN 16
#define TLS_EXT_ENCRYPT_THEN_MAC 22 /* 0x16 */
#define TLS_EXT_EXTENDED_MASTER_SECRET 0x0017 /* 23 */
#define TLS_EXT_SESSION_TICKET 35
#define TLS_EXT_RENEGOTIATION_INFO 0xFF01
/*
* TLS extension flags (for extensions with outgoing ServerHello content
* that need it (e.g. for RENEGOTIATION_INFO the server already knows because
* of state of the renegotiation flag, so no indicator is required)
*/
#define TLS_EXT_SUPPORTED_POINT_FORMATS_PRESENT (1 << 0)
/*
* Size defines
*/
#if !defined(POLARSSL_PSK_MAX_LEN)
#define POLARSSL_PSK_MAX_LEN 32 /* 256 bits */
#endif
/* Dummy type used only for its size */
union _ssl_premaster_secret
{
#if defined(POLARSSL_KEY_EXCHANGE_RSA_ENABLED)
unsigned char _pms_rsa[48]; /* RFC 5246 8.1.1 */
#endif
#if defined(POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED)
unsigned char _pms_dhm[POLARSSL_MPI_MAX_SIZE]; /* RFC 5246 8.1.2 */
#endif
#if defined(POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \
defined(POLARSSL_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) || \
defined(POLARSSL_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \
defined(POLARSSL_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)
unsigned char _pms_ecdh[POLARSSL_ECP_MAX_BYTES]; /* RFC 4492 5.10 */
#endif
#if defined(POLARSSL_KEY_EXCHANGE_PSK_ENABLED)
unsigned char _pms_psk[4 + 2 * POLARSSL_PSK_MAX_LEN]; /* RFC 4279 2 */
#endif
#if defined(POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED)
unsigned char _pms_dhe_psk[4 + POLARSSL_MPI_MAX_SIZE
+ POLARSSL_PSK_MAX_LEN]; /* RFC 4279 3 */
#endif
#if defined(POLARSSL_KEY_EXCHANGE_RSA_PSK_ENABLED)
unsigned char _pms_rsa_psk[52 + POLARSSL_PSK_MAX_LEN]; /* RFC 4279 4 */
#endif
#if defined(POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
unsigned char _pms_ecdhe_psk[4 + POLARSSL_ECP_MAX_BYTES
+ POLARSSL_PSK_MAX_LEN]; /* RFC 5489 2 */
#endif
};
#define POLARSSL_PREMASTER_SIZE sizeof( union _ssl_premaster_secret )
#ifdef __cplusplus
extern "C" {
#endif
/*
* Generic function pointers for allowing external RSA private key
* implementations.
*/
typedef int (*rsa_decrypt_func)( void *ctx, int mode, size_t *olen,
const unsigned char *input, unsigned char *output,
size_t output_max_len );
typedef int (*rsa_sign_func)( void *ctx,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
int mode, md_type_t md_alg, unsigned int hashlen,
const unsigned char *hash, unsigned char *sig );
typedef size_t (*rsa_key_len_func)( void *ctx );
/*
* SSL state machine
*/
typedef enum
{
SSL_HELLO_REQUEST,
SSL_CLIENT_HELLO,
SSL_SERVER_HELLO,
SSL_SERVER_CERTIFICATE,
SSL_SERVER_KEY_EXCHANGE,
SSL_CERTIFICATE_REQUEST,
SSL_SERVER_HELLO_DONE,
SSL_CLIENT_CERTIFICATE,
SSL_CLIENT_KEY_EXCHANGE,
SSL_CERTIFICATE_VERIFY,
SSL_CLIENT_CHANGE_CIPHER_SPEC,
SSL_CLIENT_FINISHED,
SSL_SERVER_CHANGE_CIPHER_SPEC,
SSL_SERVER_FINISHED,
SSL_FLUSH_BUFFERS,
SSL_HANDSHAKE_WRAPUP,
SSL_HANDSHAKE_OVER,
SSL_SERVER_NEW_SESSION_TICKET,
SSL_SERVER_HELLO_VERIFY_REQUEST_SENT,
}
ssl_states;
typedef struct _ssl_session ssl_session;
typedef struct _ssl_context ssl_context;
typedef struct _ssl_transform ssl_transform;
typedef struct _ssl_handshake_params ssl_handshake_params;
#if defined(POLARSSL_SSL_SESSION_TICKETS)
typedef struct _ssl_ticket_keys ssl_ticket_keys;
#endif
#if defined(POLARSSL_X509_CRT_PARSE_C)
typedef struct _ssl_key_cert ssl_key_cert;
#endif
#if defined(POLARSSL_SSL_PROTO_DTLS)
typedef struct _ssl_flight_item ssl_flight_item;
#endif
/*
* This structure is used for storing current session data.
*/
struct _ssl_session
{
#if defined(POLARSSL_HAVE_TIME)
time_t start; /*!< starting time */
#endif
int ciphersuite; /*!< chosen ciphersuite */
int compression; /*!< chosen compression */
size_t length; /*!< session id length */
unsigned char id[32]; /*!< session identifier */
unsigned char master[48]; /*!< the master secret */
#if defined(POLARSSL_X509_CRT_PARSE_C)
x509_crt *peer_cert; /*!< peer X.509 cert chain */
#endif /* POLARSSL_X509_CRT_PARSE_C */
int verify_result; /*!< verification result */
#if defined(POLARSSL_SSL_SESSION_TICKETS)
unsigned char *ticket; /*!< RFC 5077 session ticket */
size_t ticket_len; /*!< session ticket length */
uint32_t ticket_lifetime; /*!< ticket lifetime hint */
#endif /* POLARSSL_SSL_SESSION_TICKETS */
#if defined(POLARSSL_SSL_MAX_FRAGMENT_LENGTH)
unsigned char mfl_code; /*!< MaxFragmentLength negotiated by peer */
#endif /* POLARSSL_SSL_MAX_FRAGMENT_LENGTH */
#if defined(POLARSSL_SSL_TRUNCATED_HMAC)
int trunc_hmac; /*!< flag for truncated hmac activation */
#endif /* POLARSSL_SSL_TRUNCATED_HMAC */
#if defined(POLARSSL_SSL_ENCRYPT_THEN_MAC)
int encrypt_then_mac; /*!< flag for EtM activation */
#endif
};
/*
* This structure contains a full set of runtime transform parameters
* either in negotiation or active.
*/
struct _ssl_transform
{
/*
* Session specific crypto layer
*/
const ssl_ciphersuite_t *ciphersuite_info;
/*!< Chosen cipersuite_info */
unsigned int keylen; /*!< symmetric key length */
size_t minlen; /*!< min. ciphertext length */
size_t ivlen; /*!< IV length */
size_t fixed_ivlen; /*!< Fixed part of IV (AEAD) */
size_t maclen; /*!< MAC length */
unsigned char iv_enc[16]; /*!< IV (encryption) */
unsigned char iv_dec[16]; /*!< IV (decryption) */
#if defined(POLARSSL_SSL_PROTO_SSL3)
/* Needed only for SSL v3.0 secret */
unsigned char mac_enc[20]; /*!< SSL v3.0 secret (enc) */
unsigned char mac_dec[20]; /*!< SSL v3.0 secret (dec) */
#endif /* POLARSSL_SSL_PROTO_SSL3 */
md_context_t md_ctx_enc; /*!< MAC (encryption) */
md_context_t md_ctx_dec; /*!< MAC (decryption) */
cipher_context_t cipher_ctx_enc; /*!< encryption context */
cipher_context_t cipher_ctx_dec; /*!< decryption context */
/*
* Session specific compression layer
*/
#if defined(POLARSSL_ZLIB_SUPPORT)
z_stream ctx_deflate; /*!< compression context */
z_stream ctx_inflate; /*!< decompression context */
#endif
};
/*
* This structure contains the parameters only needed during handshake.
*/
struct _ssl_handshake_params
{
/*
* Handshake specific crypto variables
*/
int sig_alg; /*!< Hash algorithm for signature */
int cert_type; /*!< Requested cert type */
int verify_sig_alg; /*!< Signature algorithm for verify */
#if defined(POLARSSL_DHM_C)
dhm_context dhm_ctx; /*!< DHM key exchange */
#endif
#if defined(POLARSSL_ECDH_C)
ecdh_context ecdh_ctx; /*!< ECDH key exchange */
#endif
#if defined(POLARSSL_ECDH_C) || defined(POLARSSL_ECDSA_C)
const ecp_curve_info **curves; /*!< Supported elliptic curves */
#endif
#if defined(POLARSSL_X509_CRT_PARSE_C)
/**
* Current key/cert or key/cert list.
* On client: pointer to ssl->key_cert, only the first entry used.
* On server: starts as a pointer to ssl->key_cert, then becomes
* a pointer to the chosen key from this list or the SNI list.
*/
ssl_key_cert *key_cert;
#if defined(POLARSSL_SSL_SERVER_NAME_INDICATION)
ssl_key_cert *sni_key_cert; /*!< key/cert list from SNI */
#endif
#endif /* POLARSSL_X509_CRT_PARSE_C */
#if defined(POLARSSL_SSL_PROTO_DTLS)
unsigned int out_msg_seq; /*!< Outgoing handshake sequence number */
unsigned int in_msg_seq; /*!< Incoming handshake sequence number */
unsigned char *verify_cookie; /*!< Cli: HelloVerifyRequest cookie
Srv: unused */
unsigned char verify_cookie_len; /*!< Cli: cookie length
Srv: flag for sending a cookie */
unsigned char *hs_msg; /*!< Reassembled handshake message */
uint32_t retransmit_timeout; /*!< Current value of timeout */
unsigned char retransmit_state; /*!< Retransmission state */
ssl_flight_item *flight; /*!< Current outgoing flight */
ssl_flight_item *cur_msg; /*!< Current message in flight */
unsigned int in_flight_start_seq; /*!< Minimum message sequence in the
flight being received */
ssl_transform *alt_transform_out; /*!< Alternative transform for
resending messages */
unsigned char alt_out_ctr[8]; /*!< Alternative record epoch/counter
for resending messages */
#endif
/*
* Checksum contexts
*/
#if defined(POLARSSL_SSL_PROTO_SSL3) || defined(POLARSSL_SSL_PROTO_TLS1) || \
defined(POLARSSL_SSL_PROTO_TLS1_1)
md5_context fin_md5;
sha1_context fin_sha1;
#endif
#if defined(POLARSSL_SSL_PROTO_TLS1_2)
#if defined(POLARSSL_SHA256_C)
sha256_context fin_sha256;
#endif
#if defined(POLARSSL_SHA512_C)
sha512_context fin_sha512;
#endif
#endif /* POLARSSL_SSL_PROTO_TLS1_2 */
void (*update_checksum)(ssl_context *, const unsigned char *, size_t);
void (*calc_verify)(ssl_context *, unsigned char *);
void (*calc_finished)(ssl_context *, unsigned char *, int);
int (*tls_prf)(const unsigned char *, size_t, const char *,
const unsigned char *, size_t,
unsigned char *, size_t);
size_t pmslen; /*!< premaster length */
unsigned char randbytes[64]; /*!< random bytes */
unsigned char premaster[POLARSSL_PREMASTER_SIZE];
/*!< premaster secret */
int resume; /*!< session resume indicator*/
int max_major_ver; /*!< max. major version client*/
int max_minor_ver; /*!< max. minor version client*/
int cli_exts; /*!< client extension presence*/
#if defined(POLARSSL_SSL_SESSION_TICKETS)
int new_session_ticket; /*!< use NewSessionTicket? */
#endif /* POLARSSL_SSL_SESSION_TICKETS */
#if defined(POLARSSL_SSL_EXTENDED_MASTER_SECRET)
int extended_ms; /*!< use Extended Master Secret? */
#endif
};
#if defined(POLARSSL_SSL_SESSION_TICKETS)
/*
* Parameters needed to secure session tickets
*/
struct _ssl_ticket_keys
{
unsigned char key_name[16]; /*!< name to quickly discard bad tickets */
aes_context enc; /*!< encryption context */
aes_context dec; /*!< decryption context */
unsigned char mac_key[16]; /*!< authentication key */
};
#endif /* POLARSSL_SSL_SESSION_TICKETS */
#if defined(POLARSSL_X509_CRT_PARSE_C)
/*
* List of certificate + private key pairs
*/
struct _ssl_key_cert
{
x509_crt *cert; /*!< cert */
pk_context *key; /*!< private key */
int key_own_alloc; /*!< did we allocate key? */
ssl_key_cert *next; /*!< next key/cert pair */
};
#endif /* POLARSSL_X509_CRT_PARSE_C */
#if defined(POLARSSL_SSL_PROTO_DTLS)
/*
* List of handshake messages kept around for resending
*/
struct _ssl_flight_item
{
unsigned char *p; /*!< message, including handshake headers */
size_t len; /*!< length of p */
unsigned char type; /*!< type of the message: handshake or CCS */
ssl_flight_item *next; /*!< next handshake message(s) */
};
#endif /* POLARSSL_SSL_PROTO_DTLS */
struct _ssl_context
{
/*
* Miscellaneous
*/
int state; /*!< SSL handshake: current state */
int transport; /*!< Transport: stream or datagram */
int renegotiation; /*!< Initial or renegotiation */
#if defined(POLARSSL_SSL_RENEGOTIATION)
int renego_records_seen; /*!< Records since renego request, or with DTLS,
number of retransmissions of request if
renego_max_records is < 0 */
#endif
int major_ver; /*!< equal to SSL_MAJOR_VERSION_3 */
int minor_ver; /*!< either 0 (SSL3) or 1 (TLS1.0) */
int max_major_ver; /*!< max. major version used */
int max_minor_ver; /*!< max. minor version used */
int min_major_ver; /*!< min. major version used */
int min_minor_ver; /*!< min. minor version used */
uint32_t read_timeout; /*!< timeout for ssl_read in milliseconds */
#if defined(POLARSSL_SSL_DTLS_BADMAC_LIMIT)
unsigned badmac_limit; /*!< limit of records with a bad MAC */
unsigned badmac_seen; /*!< records with a bad MAC received */
#endif
#if defined(POLARSSL_SSL_FALLBACK_SCSV) && defined(POLARSSL_SSL_CLI_C)
char fallback; /*!< flag for fallback connections */
#endif
#if defined(POLARSSL_SSL_ENCRYPT_THEN_MAC)
char encrypt_then_mac; /*!< flag for encrypt-then-mac */
#endif
#if defined(POLARSSL_SSL_EXTENDED_MASTER_SECRET)
char extended_ms; /*!< flag for extended master secret */
#endif
char arc4_disabled; /*!< flag for disabling RC4 */
/*
* Callbacks (RNG, debug, I/O, verification)
*/
int (*f_rng)(void *, unsigned char *, size_t);
void (*f_dbg)(void *, int, const char *);
int (*f_send)(void *, const unsigned char *, size_t);
int (*f_recv)(void *, unsigned char *, size_t);
int (*f_recv_timeout)(void *, unsigned char *, size_t, uint32_t);
int (*f_get_cache)(void *, ssl_session *);
int (*f_set_cache)(void *, const ssl_session *);
void *p_rng; /*!< context for the RNG function */
void *p_dbg; /*!< context for the debug function */
void *p_bio; /*!< context for I/O operations */
void *p_get_cache; /*!< context for cache retrieval */
void *p_set_cache; /*!< context for cache store */
void *p_hw_data; /*!< context for HW acceleration */
#if defined(POLARSSL_SSL_SERVER_NAME_INDICATION)
int (*f_sni)(void *, ssl_context *, const unsigned char *, size_t);
void *p_sni; /*!< context for SNI extension */
#endif
#if defined(POLARSSL_X509_CRT_PARSE_C)
int (*f_vrfy)(void *, x509_crt *, int, int *);
void *p_vrfy; /*!< context for verification */
#endif
#if defined(POLARSSL_KEY_EXCHANGE__SOME__PSK_ENABLED)
int (*f_psk)(void *, ssl_context *, const unsigned char *, size_t);
void *p_psk; /*!< context for PSK retrieval */
#endif
/*
* Session layer
*/
ssl_session *session_in; /*!< current session data (in) */
ssl_session *session_out; /*!< current session data (out) */
ssl_session *session; /*!< negotiated session data */
ssl_session *session_negotiate; /*!< session data in negotiation */
ssl_handshake_params *handshake; /*!< params required only during
the handshake process */
/*
* Record layer transformations
*/
ssl_transform *transform_in; /*!< current transform params (in) */
ssl_transform *transform_out; /*!< current transform params (in) */
ssl_transform *transform; /*!< negotiated transform params */
ssl_transform *transform_negotiate; /*!< transform params in negotiation */
/*
* Timers
*/
#if defined(POLARSSL_SSL_PROTO_DTLS)
struct hr_time time_info; /*!< timer context */
unsigned long time_limit; /*!< limit for the running timer */
uint32_t hs_timeout_min; /*!< initial value of the handshake
retransmission timeout */
uint32_t hs_timeout_max; /*!< maximum value of the handshake
retransmission timeout */
#endif
/*
* Record layer (incoming data)
*/
unsigned char *in_buf; /*!< input buffer */
unsigned char *in_ctr; /*!< 64-bit incoming message counter
TLS: maintained by us
DTLS: read from peer */
unsigned char *in_hdr; /*!< start of record header */
unsigned char *in_len; /*!< two-bytes message length field */
unsigned char *in_iv; /*!< ivlen-byte IV */
unsigned char *in_msg; /*!< message contents (in_iv+ivlen) */
unsigned char *in_offt; /*!< read offset in application data */
int in_msgtype; /*!< record header: message type */
size_t in_msglen; /*!< record header: message length */
size_t in_left; /*!< amount of data read so far */
#if defined(POLARSSL_SSL_PROTO_DTLS)
uint16_t in_epoch; /*!< DTLS epoch for incoming records */
size_t next_record_offset; /*!< offset of the next record in datagram
(equal to in_left if none) */
#endif
#if defined(POLARSSL_SSL_DTLS_ANTI_REPLAY)
uint64_t in_window_top; /*!< last validated record seq_num */
uint64_t in_window; /*!< bitmask for replay detection */
char anti_replay; /*!< is anti-replay on? */
#endif
size_t in_hslen; /*!< current handshake message length,
including the handshake header */
int nb_zero; /*!< # of 0-length encrypted messages */
int record_read; /*!< record is already present */
/*
* Record layer (outgoing data)
*/
unsigned char *out_buf; /*!< output buffer */
unsigned char *out_ctr; /*!< 64-bit outgoing message counter */
unsigned char *out_hdr; /*!< start of record header */
unsigned char *out_len; /*!< two-bytes message length field */
unsigned char *out_iv; /*!< ivlen-byte IV */
unsigned char *out_msg; /*!< message contents (out_iv+ivlen) */
int out_msgtype; /*!< record header: message type */
size_t out_msglen; /*!< record header: message length */
size_t out_left; /*!< amount of data not yet written */
#if defined(POLARSSL_ZLIB_SUPPORT)
unsigned char *compress_buf; /*!< zlib data buffer */
#endif
#if defined(POLARSSL_SSL_MAX_FRAGMENT_LENGTH)
unsigned char mfl_code; /*!< MaxFragmentLength chosen by us */
#endif /* POLARSSL_SSL_MAX_FRAGMENT_LENGTH */
#if defined(POLARSSL_SSL_CBC_RECORD_SPLITTING)
signed char split_done; /*!< flag for record splitting:
-1 disabled, 0 todo, 1 done */
#endif
/*
* PKI layer
*/
#if defined(POLARSSL_X509_CRT_PARSE_C)
ssl_key_cert *key_cert; /*!< own certificate(s)/key(s) */
x509_crt *ca_chain; /*!< own trusted CA chain */
x509_crl *ca_crl; /*!< trusted CA CRLs */
const char *peer_cn; /*!< expected peer CN */
#endif /* POLARSSL_X509_CRT_PARSE_C */
/*
* Support for generating and checking session tickets
*/
#if defined(POLARSSL_SSL_SESSION_TICKETS)
ssl_ticket_keys *ticket_keys; /*!< keys for ticket encryption */
#endif /* POLARSSL_SSL_SESSION_TICKETS */
/*
* User settings
*/
int endpoint; /*!< 0: client, 1: server */
int authmode; /*!< verification mode */
int client_auth; /*!< flag for client auth. */
int verify_result; /*!< verification result */
#if defined(POLARSSL_SSL_RENEGOTIATION)
int disable_renegotiation; /*!< enable/disable renegotiation */
int renego_max_records; /*!< grace period for renegotiation */
unsigned char renego_period[8]; /*!< value of the record counters
that triggers renegotiation */
#endif
int allow_legacy_renegotiation; /*!< allow legacy renegotiation */
const int *ciphersuite_list[4]; /*!< allowed ciphersuites / version */
#if defined(POLARSSL_SSL_SET_CURVES)
const ecp_group_id *curve_list; /*!< allowed curves */
#endif
#if defined(POLARSSL_SSL_TRUNCATED_HMAC)
int trunc_hmac; /*!< negotiate truncated hmac? */
#endif
#if defined(POLARSSL_SSL_SESSION_TICKETS)
int session_tickets; /*!< use session tickets? */
int ticket_lifetime; /*!< session ticket lifetime */
#endif
#if defined(POLARSSL_DHM_C)
mpi dhm_P; /*!< prime modulus for DHM */
mpi dhm_G; /*!< generator for DHM */
#endif
#if defined(POLARSSL_KEY_EXCHANGE__SOME__PSK_ENABLED)
/*
* PSK values
*/
unsigned char *psk;
size_t psk_len;
unsigned char *psk_identity;
size_t psk_identity_len;
#endif
#if defined(POLARSSL_SSL_SERVER_NAME_INDICATION)
/*
* SNI extension
*/
unsigned char *hostname;
size_t hostname_len;
#endif
#if defined(POLARSSL_SSL_ALPN)
/*
* ALPN extension
*/
const char **alpn_list; /*!< ordered list of supported protocols */
const char *alpn_chosen; /*!< negotiated protocol */
#endif
/*
* Information for DTLS hello verify
*/
#if defined(POLARSSL_SSL_DTLS_HELLO_VERIFY)
unsigned char *cli_id; /*!< transport-level ID of the client */
size_t cli_id_len; /*!< length of cli_id */
int (*f_cookie_write)( void *, unsigned char **, unsigned char *,
const unsigned char *, size_t );
int (*f_cookie_check)( void *, const unsigned char *, size_t,
const unsigned char *, size_t );
void *p_cookie; /*!< context for the cookie callbacks */
#endif
/*
* Secure renegotiation
*/
int secure_renegotiation; /*!< does peer support legacy or
secure renegotiation */
#if defined(POLARSSL_SSL_RENEGOTIATION)
size_t verify_data_len; /*!< length of verify data stored */
char own_verify_data[SSL_VERIFY_DATA_MAX_LEN]; /*!< previous handshake verify data */
char peer_verify_data[SSL_VERIFY_DATA_MAX_LEN]; /*!< previous handshake verify data */
#endif
};
#if defined(POLARSSL_SSL_HW_RECORD_ACCEL)
#define SSL_CHANNEL_OUTBOUND 0
#define SSL_CHANNEL_INBOUND 1
extern int (*ssl_hw_record_init)(ssl_context *ssl,
const unsigned char *key_enc, const unsigned char *key_dec,
size_t keylen,
const unsigned char *iv_enc, const unsigned char *iv_dec,
size_t ivlen,
const unsigned char *mac_enc, const unsigned char *mac_dec,
size_t maclen);
extern int (*ssl_hw_record_activate)(ssl_context *ssl, int direction);
extern int (*ssl_hw_record_reset)(ssl_context *ssl);
extern int (*ssl_hw_record_write)(ssl_context *ssl);
extern int (*ssl_hw_record_read)(ssl_context *ssl);
extern int (*ssl_hw_record_finish)(ssl_context *ssl);
#endif /* POLARSSL_SSL_HW_RECORD_ACCEL */
/**
* \brief Returns the list of ciphersuites supported by the SSL/TLS module.
*
* \return a statically allocated array of ciphersuites, the last
* entry is 0.
*/
const int *ssl_list_ciphersuites( void );
/**
* \brief Return the name of the ciphersuite associated with the
* given ID
*
* \param ciphersuite_id SSL ciphersuite ID
*
* \return a string containing the ciphersuite name
*/
const char *ssl_get_ciphersuite_name( const int ciphersuite_id );
/**
* \brief Return the ID of the ciphersuite associated with the
* given name
*
* \param ciphersuite_name SSL ciphersuite name
*
* \return the ID with the ciphersuite or 0 if not found
*/
int ssl_get_ciphersuite_id( const char *ciphersuite_name );
/**
* \brief Initialize an SSL context
* (An individual SSL context is not thread-safe)
*
* \param ssl SSL context
*
* \return 0 if successful, or POLARSSL_ERR_SSL_MALLOC_FAILED if
* memory allocation failed
*/
int ssl_init( ssl_context *ssl );
/**
* \brief Reset an already initialized SSL context for re-use
* while retaining application-set variables, function
* pointers and data.
*
* \param ssl SSL context
* \return 0 if successful, or POLASSL_ERR_SSL_MALLOC_FAILED,
POLARSSL_ERR_SSL_HW_ACCEL_FAILED or
* POLARSSL_ERR_SSL_COMPRESSION_FAILED
*/
int ssl_session_reset( ssl_context *ssl );
/**
* \brief Set the current endpoint type
*
* \param ssl SSL context
* \param endpoint must be SSL_IS_CLIENT or SSL_IS_SERVER
*
* \note This function should be called right after ssl_init() since
* some other ssl_set_foo() functions depend on it.
*/
void ssl_set_endpoint( ssl_context *ssl, int endpoint );
/**
* \brief Set the transport type (TLS or DTLS).
* Default: TLS
*
* \param ssl SSL context
* \param transport transport type:
* SSL_TRANSPORT_STREAM for TLS,
* SSL_TRANSPORT_DATAGRAM for DTLS.
* \return 0 on success or POLARSSL_ERR_SSL_BAD_INPUT_DATA
*
* \note If DTLS is selected and max and/or min version are less
* than TLS 1.1 (DTLS 1.0) they are upped to that value.
*
* \note For DTLS, you must either provide a recv callback that
* doesn't block, or one that handles timeouts, see
* ssl_set_bio_timeout()
*/
int ssl_set_transport( ssl_context *ssl, int transport );
/**
* \brief Set the certificate verification mode
*
* \param ssl SSL context
* \param authmode can be:
*
* SSL_VERIFY_NONE: peer certificate is not checked (default),
* this is insecure and SHOULD be avoided.
*
* SSL_VERIFY_OPTIONAL: peer certificate is checked, however the
* handshake continues even if verification failed;
* ssl_get_verify_result() can be called after the
* handshake is complete.
*
* SSL_VERIFY_REQUIRED: peer *must* present a valid certificate,
* handshake is aborted if verification failed.
*
* \note On client, SSL_VERIFY_REQUIRED is the recommended mode.
* With SSL_VERIFY_OPTIONAL, the user needs to call ssl_get_verify_result() at
* the right time(s), which may not be obvious, while REQUIRED always perform
* the verification as soon as possible. For example, REQUIRED was protecting
* against the "triple handshake" attack even before it was found.
*/
void ssl_set_authmode( ssl_context *ssl, int authmode );
#if defined(POLARSSL_X509_CRT_PARSE_C)
/**
* \brief Set the verification callback (Optional).
*
* If set, the verify callback is called for each
* certificate in the chain. For implementation
* information, please see \c x509parse_verify()
*
* \param ssl SSL context
* \param f_vrfy verification function
* \param p_vrfy verification parameter
*/
void ssl_set_verify( ssl_context *ssl,
int (*f_vrfy)(void *, x509_crt *, int, int *),
void *p_vrfy );
#endif /* POLARSSL_X509_CRT_PARSE_C */
/**
* \brief Set the random number generator callback
*
* \param ssl SSL context
* \param f_rng RNG function
* \param p_rng RNG parameter
*/
void ssl_set_rng( ssl_context *ssl,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng );
/**
* \brief Set the debug callback
*
* \param ssl SSL context
* \param f_dbg debug function
* \param p_dbg debug parameter
*/
void ssl_set_dbg( ssl_context *ssl,
void (*f_dbg)(void *, int, const char *),
void *p_dbg );
/**
* \brief Set the underlying BIO read and write callbacks
*
* \param ssl SSL context
* \param f_recv read callback
* \param p_recv read parameter (must be equal to write parameter)
* \param f_send write callback
* \param p_send write parameter (must be equal to read parameter)
*
* \warning It is required that p_recv == p_send. Otherwise, the first
* attempt at sending or receiving will result in a
* POLARSSL_ERR_SSL_BAD_INPUT_DATA error.
*
* \deprecated Superseded by ssl_set_bio_timeout().
*/
void ssl_set_bio( ssl_context *ssl,
int (*f_recv)(void *, unsigned char *, size_t), void *p_recv,
int (*f_send)(void *, const unsigned char *, size_t), void *p_send );
#if defined(POLARSSL_SSL_SRV_C)
/**
* \brief Set the underlying BIO callbacks for write, read and
* read-with-timeout.
*
* \param ssl SSL context
* \param p_bio parameter (context) shared by BIO callbacks
* \param f_send write callback
* \param f_recv read callback
* \param f_recv_timeout read callback with timeout.
* The last argument of the callback is the timeout in seconds
* \param timeout value of the ssl_read() timeout in milliseconds
*
* \note f_recv_timeout is required for DTLS, unless f_recv performs
* non-blocking reads.
*
* \note TODO: timeout not supported with TLS yet
*/
void ssl_set_bio_timeout( ssl_context *ssl,
void *p_bio,
int (*f_send)(void *, const unsigned char *, size_t),
int (*f_recv)(void *, unsigned char *, size_t),
int (*f_recv_timeout)(void *, unsigned char *, size_t, uint32_t),
uint32_t timeout );
#if defined(POLARSSL_SSL_DTLS_HELLO_VERIFY)
/**
* \brief Set client's transport-level identification info.
* (Server only. DTLS only.)
*
* This is usually the IP address (and port), but could be
* anything identify the client depending on the underlying
* network stack. Used for HelloVerifyRequest with DTLS.
* This is *not* used to route the actual packets.
*
* \param ssl SSL context
* \param info Transport-level info identifying the client (eg IP + port)
* \param ilen Length of info in bytes
*
* \note An internal copy is made, so the info buffer can be reused.
*
* \return 0 on success,
* POLARSSL_ERR_SSL_BAD_INPUT_DATA if used on client,
* POLARSSL_ERR_SSL_MALLOC_FAILED if out of memory.
*/
int ssl_set_client_transport_id( ssl_context *ssl,
const unsigned char *info,
size_t ilen );
/**
* \brief Callback type: generate a cookie
*
* \param ctx Context for the callback
* \param p Buffer to write to,
* must be updated to point right after the cookie
* \param end Pointer to one past the end of the output buffer
* \param info Client ID info that was passed to
* \c ssl_set_client_transport_id()
* \param ilen Length of info in bytes
*
* \return The callback must return 0 on success,
* or a negative error code.
*/
typedef int ssl_cookie_write_t( void *ctx,
unsigned char **p, unsigned char *end,
const unsigned char *info, size_t ilen );
/**
* \brief Callback type: verify a cookie
*
* \param ctx Context for the callback
* \param cookie Cookie to verify
* \param clen Length of cookie
* \param info Client ID info that was passed to
* \c ssl_set_client_transport_id()
* \param ilen Length of info in bytes
*
* \return The callback must return 0 if cookie is valid,
* or a negative error code.
*/
typedef int ssl_cookie_check_t( void *ctx,
const unsigned char *cookie, size_t clen,
const unsigned char *info, size_t ilen );
/**
* \brief Register callbacks for DTLS cookies
* (Server only. DTLS only.)
*
* Default: dummy callbacks that fail, to force you to
* register working callbacks (and initialize their context).
*
* To disable HelloVerifyRequest, register NULL callbacks.
*
* \warning Disabling hello verification allows your server to be used
* for amplification in DoS attacks against other hosts.
* Only disable if you known this can't happen in your
* particular environment.
*
* \param ssl SSL context
* \param f_cookie_write Cookie write callback
* \param f_cookie_check Cookie check callback
* \param p_cookie Context for both callbacks
*/
void ssl_set_dtls_cookies( ssl_context *ssl,
ssl_cookie_write_t *f_cookie_write,
ssl_cookie_check_t *f_cookie_check,
void *p_cookie );
#endif /* POLARSSL_SSL_DTLS_HELLO_VERIFY */
#if defined(POLARSSL_SSL_DTLS_ANTI_REPLAY)
/**
* \brief Enable or disable anti-replay protection for DTLS.
* (DTLS only, no effect on TLS.)
* Default: enabled.
*
* \param ssl SSL context
* \param mode SSL_ANTI_REPLAY_ENABLED or SSL_ANTI_REPLAY_DISABLED.
*
* \warning Disabling this is a security risk unless the application
* protocol handles duplicated packets in a safe way. You
* should not disable this without careful consideration.
* However, if your application already detects duplicated
* packets and needs information about them to adjust its
* transmission strategy, then you'll want to disable this.
*/
void ssl_set_dtls_anti_replay( ssl_context *ssl, char mode );
#endif /* POLARSSL_SSL_DTLS_ANTI_REPLAY */
#if defined(POLARSSL_SSL_DTLS_BADMAC_LIMIT)
/**
* \brief Set a limit on the number of records with a bad MAC
* before terminating the connection.
* (DTLS only, no effect on TLS.)
* Default: 0 (disabled).
*
* \param ssl SSL context
* \param limit Limit, or 0 to disable.
*
* \note If the limit is N, then the connection is terminated when
* the Nth non-authentic record is seen.
*
* \note Records with an invalid header are not counted, only the
* ones going through the authentication-decryption phase.
*
* \note This is a security trade-off related to the fact that it's
* often relatively easy for an active attacker ot inject UDP
* datagrams. On one hand, setting a low limit here makes it
* easier for such an attacker to forcibly terminated a
* connection. On the other hand, a high limit or no limit
* might make us waste resources checking authentication on
* many bogus packets.
*/
void ssl_set_dtls_badmac_limit( ssl_context *ssl, unsigned limit );
#endif /* POLARSSL_SSL_DTLS_BADMAC_LIMIT */
#if defined(POLARSSL_SSL_PROTO_DTLS)
/**
* \brief Set retransmit timeout values for the DTLS handshale.
* (DTLS only, no effect on TLS.)
*
* \param ssl SSL context
* \param min Initial timeout value in milliseconds.
* Default: 1000 (1 second).
* \param max Maximum timeout value in milliseconds.
* Default: 60000 (60 seconds).
*
* \note Default values are from RFC 6347 section 4.2.4.1.
*
* \note Higher values for initial timeout may increase average
* handshake latency. Lower values may increase the risk of
* network congestion by causing more retransmissions.
*/
void ssl_set_handshake_timeout( ssl_context *ssl, uint32_t min, uint32_t max );
#endif /* POLARSSL_SSL_PROTO_DTLS */
/**
* \brief Set the session cache callbacks (server-side only)
* If not set, no session resuming is done (except if session
* tickets are enabled too).
*
* The session cache has the responsibility to check for stale
* entries based on timeout. See RFC 5246 for recommendations.
*
* Warning: session.peer_cert is cleared by the SSL/TLS layer on
* connection shutdown, so do not cache the pointer! Either set
* it to NULL or make a full copy of the certificate.
*
* The get callback is called once during the initial handshake
* to enable session resuming. The get function has the
* following parameters: (void *parameter, ssl_session *session)
* If a valid entry is found, it should fill the master of
* the session object with the cached values and return 0,
* return 1 otherwise. Optionally peer_cert can be set as well
* if it is properly present in cache entry.
*
* The set callback is called once during the initial handshake
* to enable session resuming after the entire handshake has
* been finished. The set function has the following parameters:
* (void *parameter, const ssl_session *session). The function
* should create a cache entry for future retrieval based on
* the data in the session structure and should keep in mind
* that the ssl_session object presented (and all its referenced
* data) is cleared by the SSL/TLS layer when the connection is
* terminated. It is recommended to add metadata to determine if
* an entry is still valid in the future. Return 0 if
* successfully cached, return 1 otherwise.
*
* \param ssl SSL context
* \param f_get_cache session get callback
* \param p_get_cache session get parameter
* \param f_set_cache session set callback
* \param p_set_cache session set parameter
*/
void ssl_set_session_cache( ssl_context *ssl,
int (*f_get_cache)(void *, ssl_session *), void *p_get_cache,
int (*f_set_cache)(void *, const ssl_session *), void *p_set_cache );
#endif /* POLARSSL_SSL_SRV_C */
#if defined(POLARSSL_SSL_CLI_C)
/**
* \brief Request resumption of session (client-side only)
* Session data is copied from presented session structure.
*
* \param ssl SSL context
* \param session session context
*
* \return 0 if successful,
* POLARSSL_ERR_SSL_MALLOC_FAILED if memory allocation failed,
* POLARSSL_ERR_SSL_BAD_INPUT_DATA if used server-side or
* arguments are otherwise invalid
*
* \sa ssl_get_session()
*/
int ssl_set_session( ssl_context *ssl, const ssl_session *session );
#endif /* POLARSSL_SSL_CLI_C */
/**
* \brief Set the list of allowed ciphersuites and the preference
* order. First in the list has the highest preference.
* (Overrides all version specific lists)
*
* Note: The server uses its own preferences
* over the preference of the client unless
* POLARSSL_SSL_SRV_RESPECT_CLIENT_PREFERENCE is defined!
*
* \param ssl SSL context
* \param ciphersuites 0-terminated list of allowed ciphersuites
*/
void ssl_set_ciphersuites( ssl_context *ssl, const int *ciphersuites );
/**
* \brief Set the list of allowed ciphersuites and the
* preference order for a specific version of the protocol.
* (Only useful on the server side)
*
* \param ssl SSL context
* \param ciphersuites 0-terminated list of allowed ciphersuites
* \param major Major version number (only SSL_MAJOR_VERSION_3
* supported)
* \param minor Minor version number (SSL_MINOR_VERSION_0,
* SSL_MINOR_VERSION_1 and SSL_MINOR_VERSION_2,
* SSL_MINOR_VERSION_3 supported)
*
* \note With DTLS, use SSL_MINOR_VERSION_2 for DTLS 1.0
* and SSL_MINOR_VERSION_3 for DTLS 1.2
*/
void ssl_set_ciphersuites_for_version( ssl_context *ssl,
const int *ciphersuites,
int major, int minor );
#if defined(POLARSSL_X509_CRT_PARSE_C)
/**
* \brief Set the data required to verify peer certificate
*
* \param ssl SSL context
* \param ca_chain trusted CA chain (meaning all fully trusted top-level CAs)
* \param ca_crl trusted CA CRLs
* \param peer_cn expected peer CommonName (or NULL)
*/
void ssl_set_ca_chain( ssl_context *ssl, x509_crt *ca_chain,
x509_crl *ca_crl, const char *peer_cn );
/**
* \brief Set own certificate chain and private key
*
* \note own_cert should contain in order from the bottom up your
* certificate chain. The top certificate (self-signed)
* can be omitted.
*
* \note This function may be called more than once if you want to
* support multiple certificates (eg, one using RSA and one
* using ECDSA). However, on client, currently only the first
* certificate is used (subsequent calls have no effect).
*
* \param ssl SSL context
* \param own_cert own public certificate chain
* \param pk_key own private key
*
* \return 0 on success or POLARSSL_ERR_SSL_MALLOC_FAILED
*/
int ssl_set_own_cert( ssl_context *ssl, x509_crt *own_cert,
pk_context *pk_key );
#if defined(POLARSSL_RSA_C)
/**
* \brief Set own certificate chain and private RSA key
*
* Note: own_cert should contain IN order from the bottom
* up your certificate chain. The top certificate (self-signed)
* can be omitted.
*
* \warning This backwards-compatibility function is deprecated!
* Please use \c ssl_set_own_cert() instead.
*
* \param ssl SSL context
* \param own_cert own public certificate chain
* \param rsa_key own private RSA key
*
* \return 0 on success, or a specific error code.
*/
int ssl_set_own_cert_rsa( ssl_context *ssl, x509_crt *own_cert,
rsa_context *rsa_key );
#endif /* POLARSSL_RSA_C */
/**
* \brief Set own certificate and external RSA private
* key and handling callbacks, such as the PKCS#11 wrappers
* or any other external private key handler.
* (see the respective RSA functions in rsa.h for documentation
* of the callback parameters, with the only change being
* that the rsa_context * is a void * in the callbacks)
*
* Note: own_cert should contain IN order from the bottom
* up your certificate chain. The top certificate (self-signed)
* can be omitted.
*
* \warning This backwards-compatibility function is deprecated!
* Please use \c pk_init_ctx_rsa_alt()
* and \c ssl_set_own_cert() instead.
*
* \param ssl SSL context
* \param own_cert own public certificate chain
* \param rsa_key alternate implementation private RSA key
* \param rsa_decrypt alternate implementation of \c rsa_pkcs1_decrypt()
* \param rsa_sign alternate implementation of \c rsa_pkcs1_sign()
* \param rsa_key_len function returning length of RSA key in bytes
*
* \return 0 on success, or a specific error code.
*/
int ssl_set_own_cert_alt( ssl_context *ssl, x509_crt *own_cert,
void *rsa_key,
rsa_decrypt_func rsa_decrypt,
rsa_sign_func rsa_sign,
rsa_key_len_func rsa_key_len );
#endif /* POLARSSL_X509_CRT_PARSE_C */
#if defined(POLARSSL_KEY_EXCHANGE__SOME__PSK_ENABLED)
/**
* \brief Set the Pre Shared Key (PSK) and the identity name connected
* to it.
*
* \param ssl SSL context
* \param psk pointer to the pre-shared key
* \param psk_len pre-shared key length
* \param psk_identity pointer to the pre-shared key identity
* \param psk_identity_len identity key length
*
* \return 0 if successful or POLARSSL_ERR_SSL_MALLOC_FAILED
*/
int ssl_set_psk( ssl_context *ssl, const unsigned char *psk, size_t psk_len,
const unsigned char *psk_identity, size_t psk_identity_len );
/**
* \brief Set the PSK callback (server-side only) (Optional).
*
* If set, the PSK callback is called for each
* handshake where a PSK ciphersuite was negotiated.
* The caller provides the identity received and wants to
* receive the actual PSK data and length.
*
* The callback has the following parameters: (void *parameter,
* ssl_context *ssl, const unsigned char *psk_identity,
* size_t identity_len)
* If a valid PSK identity is found, the callback should use
* ssl_set_psk() on the ssl context to set the correct PSK and
* identity and return 0.
* Any other return value will result in a denied PSK identity.
*
* \param ssl SSL context
* \param f_psk PSK identity function
* \param p_psk PSK identity parameter
*/
void ssl_set_psk_cb( ssl_context *ssl,
int (*f_psk)(void *, ssl_context *, const unsigned char *,
size_t),
void *p_psk );
#endif /* POLARSSL_KEY_EXCHANGE__SOME__PSK_ENABLED */
#if defined(POLARSSL_DHM_C)
/**
* \brief Set the Diffie-Hellman public P and G values,
* read as hexadecimal strings (server-side only)
* (Default: POLARSSL_DHM_RFC5114_MODP_1024_[PG])
*
* \param ssl SSL context
* \param dhm_P Diffie-Hellman-Merkle modulus
* \param dhm_G Diffie-Hellman-Merkle generator
*
* \return 0 if successful
*/
int ssl_set_dh_param( ssl_context *ssl, const char *dhm_P, const char *dhm_G );
/**
* \brief Set the Diffie-Hellman public P and G values,
* read from existing context (server-side only)
*
* \param ssl SSL context
* \param dhm_ctx Diffie-Hellman-Merkle context
*
* \return 0 if successful
*/
int ssl_set_dh_param_ctx( ssl_context *ssl, dhm_context *dhm_ctx );
#endif /* POLARSSL_DHM_C */
#if defined(POLARSSL_SSL_SET_CURVES)
/**
* \brief Set the allowed curves in order of preference.
* (Default: all defined curves.)
*
* On server: this only affects selection of the ECDHE curve;
* the curves used for ECDH and ECDSA are determined by the
* list of available certificates instead.
*
* On client: this affects the list of curves offered for any
* use. The server can override our preference order.
*
* Both sides: limits the set of curves used by peer to the
* listed curves for any use (ECDH(E), certificates).
*
* \param ssl SSL context
* \param curves Ordered list of allowed curves,
* terminated by POLARSSL_ECP_DP_NONE.
*/
void ssl_set_curves( ssl_context *ssl, const ecp_group_id *curves );
#endif /* POLARSSL_SSL_SET_CURVES */
#if defined(POLARSSL_SSL_SERVER_NAME_INDICATION)
/**
* \brief Set hostname for ServerName TLS extension
* (client-side only)
*
*
* \param ssl SSL context
* \param hostname the server hostname
*
* \return 0 if successful or POLARSSL_ERR_SSL_MALLOC_FAILED
*/
int ssl_set_hostname( ssl_context *ssl, const char *hostname );
/**
* \brief Set server side ServerName TLS extension callback
* (optional, server-side only).
*
* If set, the ServerName callback is called whenever the
* server receives a ServerName TLS extension from the client
* during a handshake. The ServerName callback has the
* following parameters: (void *parameter, ssl_context *ssl,
* const unsigned char *hostname, size_t len). If a suitable
* certificate is found, the callback should set the
* certificate and key to use with ssl_set_own_cert() (and
* possibly adjust the CA chain as well) and return 0. The
* callback should return -1 to abort the handshake at this
* point.
*
* \param ssl SSL context
* \param f_sni verification function
* \param p_sni verification parameter
*/
void ssl_set_sni( ssl_context *ssl,
int (*f_sni)(void *, ssl_context *, const unsigned char *,
size_t),
void *p_sni );
#endif /* POLARSSL_SSL_SERVER_NAME_INDICATION */
#if defined(POLARSSL_SSL_ALPN)
/**
* \brief Set the supported Application Layer Protocols.
*
* \param ssl SSL context
* \param protos NULL-terminated list of supported protocols,
* in decreasing preference order.
*
* \return 0 on success, or POLARSSL_ERR_SSL_BAD_INPUT_DATA.
*/
int ssl_set_alpn_protocols( ssl_context *ssl, const char **protos );
/**
* \brief Get the name of the negotiated Application Layer Protocol.
* This function should be called after the handshake is
* completed.
*
* \param ssl SSL context
*
* \return Protcol name, or NULL if no protocol was negotiated.
*/
const char *ssl_get_alpn_protocol( const ssl_context *ssl );
#endif /* POLARSSL_SSL_ALPN */
/**
* \brief Set the maximum supported version sent from the client side
* and/or accepted at the server side
* (Default: SSL_MAX_MAJOR_VERSION, SSL_MAX_MINOR_VERSION)
*
* Note: This ignores ciphersuites from 'higher' versions.
*
* \param ssl SSL context
* \param major Major version number (only SSL_MAJOR_VERSION_3 supported)
* \param minor Minor version number (SSL_MINOR_VERSION_0,
* SSL_MINOR_VERSION_1 and SSL_MINOR_VERSION_2,
* SSL_MINOR_VERSION_3 supported)
* \return 0 on success or POLARSSL_ERR_SSL_BAD_INPUT_DATA
*
* \note With DTLS, use SSL_MINOR_VERSION_2 for DTLS 1.0 and
* SSL_MINOR_VERSION_3 for DTLS 1.2
*/
int ssl_set_max_version( ssl_context *ssl, int major, int minor );
/**
* \brief Set the minimum accepted SSL/TLS protocol version
* (Default: SSL_MIN_MAJOR_VERSION, SSL_MIN_MINOR_VERSION)
*
* \note Input outside of the SSL_MAX_XXXXX_VERSION and
* SSL_MIN_XXXXX_VERSION range is ignored.
*
* \note SSL_MINOR_VERSION_0 (SSL v3) should be avoided.
*
* \param ssl SSL context
* \param major Major version number (only SSL_MAJOR_VERSION_3 supported)
* \param minor Minor version number (SSL_MINOR_VERSION_0,
* SSL_MINOR_VERSION_1 and SSL_MINOR_VERSION_2,
* SSL_MINOR_VERSION_3 supported)
* \return 0 on success or POLARSSL_ERR_SSL_BAD_INPUT_DATA
*
* \note With DTLS, use SSL_MINOR_VERSION_2 for DTLS 1.0 and
* SSL_MINOR_VERSION_3 for DTLS 1.2
*/
int ssl_set_min_version( ssl_context *ssl, int major, int minor );
#if defined(POLARSSL_SSL_FALLBACK_SCSV) && defined(POLARSSL_SSL_CLI_C)
/**
* \brief Set the fallback flag (client-side only).
* (Default: SSL_IS_NOT_FALLBACK).
*
* \note Set to SSL_IS_FALLBACK when preparing a fallback
* connection, that is a connection with max_version set to a
* lower value than the value you're willing to use. Such
* fallback connections are not recommended but are sometimes
* necessary to interoperate with buggy (version-intolerant)
* servers.
*
* \warning You should NOT set this to SSL_IS_FALLBACK for
* non-fallback connections! This would appear to work for a
* while, then cause failures when the server is upgraded to
* support a newer TLS version.
*
* \param ssl SSL context
* \param fallback SSL_IS_NOT_FALLBACK or SSL_IS_FALLBACK
*/
void ssl_set_fallback( ssl_context *ssl, char fallback );
#endif /* POLARSSL_SSL_FALLBACK_SCSV && POLARSSL_SSL_CLI_C */
#if defined(POLARSSL_SSL_ENCRYPT_THEN_MAC)
/**
* \brief Enable or disable Encrypt-then-MAC
* (Default: SSL_ETM_ENABLED)
*
* \note This should always be enabled, it is a security
* improvement, and should not cause any interoperability
* issue (used only if the peer supports it too).
*
* \param ssl SSL context
* \param etm SSL_ETM_ENABLED or SSL_ETM_DISABLED
*/
void ssl_set_encrypt_then_mac( ssl_context *ssl, char etm );
#endif /* POLARSSL_SSL_ENCRYPT_THEN_MAC */
#if defined(POLARSSL_SSL_EXTENDED_MASTER_SECRET)
/**
* \brief Enable or disable Extended Master Secret negotiation.
* (Default: SSL_EXTENDED_MS_ENABLED)
*
* \note This should always be enabled, it is a security fix to the
* protocol, and should not cause any interoperability issue
* (used only if the peer supports it too).
*
* \param ssl SSL context
* \param ems SSL_EXTENDED_MS_ENABLED or SSL_EXTENDED_MS_DISABLED
*/
void ssl_set_extended_master_secret( ssl_context *ssl, char ems );
#endif /* POLARSSL_SSL_EXTENDED_MASTER_SECRET */
/**
* \brief Disable or enable support for RC4
* (Default: SSL_ARC4_ENABLED)
*
* \note Though the default is RC4 for compatibility reasons in the
* 1.3 branch, the recommended value is SSL_ARC4_DISABLED.
*
* \note This function will likely be removed in future versions as
* RC4 will then be disabled by default at compile time.
*
* \param ssl SSL context
* \param arc4 SSL_ARC4_ENABLED or SSL_ARC4_DISABLED
*/
void ssl_set_arc4_support( ssl_context *ssl, char arc4 );
#if defined(POLARSSL_SSL_MAX_FRAGMENT_LENGTH)
/**
* \brief Set the maximum fragment length to emit and/or negotiate
* (Default: SSL_MAX_CONTENT_LEN, usually 2^14 bytes)
* (Server: set maximum fragment length to emit,
* usually negotiated by the client during handshake
* (Client: set maximum fragment length to emit *and*
* negotiate with the server during handshake)
*
* \param ssl SSL context
* \param mfl_code Code for maximum fragment length (allowed values:
* SSL_MAX_FRAG_LEN_512, SSL_MAX_FRAG_LEN_1024,
* SSL_MAX_FRAG_LEN_2048, SSL_MAX_FRAG_LEN_4096)
*
* \return O if successful or POLARSSL_ERR_SSL_BAD_INPUT_DATA
*/
int ssl_set_max_frag_len( ssl_context *ssl, unsigned char mfl_code );
#endif /* POLARSSL_SSL_MAX_FRAGMENT_LENGTH */
#if defined(POLARSSL_SSL_TRUNCATED_HMAC)
/**
* \brief Activate negotiation of truncated HMAC
* (Default: SSL_TRUNC_HMAC_DISABLED on client,
* SSL_TRUNC_HMAC_ENABLED on server.)
*
* \param ssl SSL context
* \param truncate Enable or disable (SSL_TRUNC_HMAC_ENABLED or
* SSL_TRUNC_HMAC_DISABLED)
*
* \return Always 0.
*/
int ssl_set_truncated_hmac( ssl_context *ssl, int truncate );
#endif /* POLARSSL_SSL_TRUNCATED_HMAC */
#if defined(POLARSSL_SSL_CBC_RECORD_SPLITTING)
/**
* \brief Enable / Disable 1/n-1 record splitting
* (Default: SSL_CBC_RECORD_SPLITTING_ENABLED)
*
* \note Only affects SSLv3 and TLS 1.0, not higher versions.
* Does not affect non-CBC ciphersuites in any version.
*
* \param ssl SSL context
* \param split SSL_CBC_RECORD_SPLITTING_ENABLED or
* SSL_CBC_RECORD_SPLITTING_DISABLED
*/
void ssl_set_cbc_record_splitting( ssl_context *ssl, char split );
#endif /* POLARSSL_SSL_CBC_RECORD_SPLITTING */
#if defined(POLARSSL_SSL_SESSION_TICKETS)
/**
* \brief Enable / Disable session tickets
* (Default: SSL_SESSION_TICKETS_ENABLED on client,
* SSL_SESSION_TICKETS_DISABLED on server)
*
* \note On server, ssl_set_rng() must be called before this function
* to allow generating the ticket encryption and
* authentication keys.
*
* \param ssl SSL context
* \param use_tickets Enable or disable (SSL_SESSION_TICKETS_ENABLED or
* SSL_SESSION_TICKETS_DISABLED)
*
* \return O if successful,
* or a specific error code (server only).
*/
int ssl_set_session_tickets( ssl_context *ssl, int use_tickets );
/**
* \brief Set session ticket lifetime (server only)
* (Default: SSL_DEFAULT_TICKET_LIFETIME (86400 secs / 1 day))
*
* \param ssl SSL context
* \param lifetime session ticket lifetime
*/
void ssl_set_session_ticket_lifetime( ssl_context *ssl, int lifetime );
#endif /* POLARSSL_SSL_SESSION_TICKETS */
#if defined(POLARSSL_SSL_RENEGOTIATION)
/**
* \brief Enable / Disable renegotiation support for connection when
* initiated by peer
* (Default: SSL_RENEGOTIATION_DISABLED)
*
* Note: A server with support enabled is more vulnerable for a
* resource DoS by a malicious client. You should enable this on
* a client to enable server-initiated renegotiation.
*
* \param ssl SSL context
* \param renegotiation Enable or disable (SSL_RENEGOTIATION_ENABLED or
* SSL_RENEGOTIATION_DISABLED)
*/
void ssl_set_renegotiation( ssl_context *ssl, int renegotiation );
#endif /* POLARSSL_SSL_RENEGOTIATION */
/**
* \brief Prevent or allow legacy renegotiation.
* (Default: SSL_LEGACY_NO_RENEGOTIATION)
*
* SSL_LEGACY_NO_RENEGOTIATION allows connections to
* be established even if the peer does not support
* secure renegotiation, but does not allow renegotiation
* to take place if not secure.
* (Interoperable and secure option)
*
* SSL_LEGACY_ALLOW_RENEGOTIATION allows renegotiations
* with non-upgraded peers. Allowing legacy renegotiation
* makes the connection vulnerable to specific man in the
* middle attacks. (See RFC 5746)
* (Most interoperable and least secure option)
*
* SSL_LEGACY_BREAK_HANDSHAKE breaks off connections
* if peer does not support secure renegotiation. Results
* in interoperability issues with non-upgraded peers
* that do not support renegotiation altogether.
* (Most secure option, interoperability issues)
*
* \param ssl SSL context
* \param allow_legacy Prevent or allow (SSL_NO_LEGACY_RENEGOTIATION,
* SSL_ALLOW_LEGACY_RENEGOTIATION or
* SSL_LEGACY_BREAK_HANDSHAKE)
*/
void ssl_legacy_renegotiation( ssl_context *ssl, int allow_legacy );
#if defined(POLARSSL_SSL_RENEGOTIATION)
/**
* \brief Enforce renegotiation requests.
* (Default: enforced, max_records = 16)
*
* When we request a renegotiation, the peer can comply or
* ignore the request. This function allows us to decide
* whether to enforce our renegotiation requests by closing
* the connection if the peer doesn't comply.
*
* However, records could already be in transit from the peer
* when the request is emitted. In order to increase
* reliability, we can accept a number of records before the
* expected handshake records.
*
* The optimal value is highly dependent on the specific usage
* scenario.
*
* \note With DTLS and server-initiated renegotiation, the
* HelloRequest is retransmited every time ssl_read() times
* out or receives Application Data, until:
* - max_records records have beens seen, if it is >= 0, or
* - the number of retransmits that would happen during an
* actual handshake has been reached.
* Please remember the request might be lost a few times
* if you consider setting max_records to a really low value.
*
* \warning On client, the grace period can only happen during
* ssl_read(), as opposed to ssl_write() and ssl_renegotiate()
* which always behave as if max_record was 0. The reason is,
* if we receive application data from the server, we need a
* place to write it, which only happens during ssl_read().
*
* \param ssl SSL context
* \param max_records Use SSL_RENEGOTIATION_NOT_ENFORCED if you don't want to
* enforce renegotiation, or a non-negative value to enforce
* it but allow for a grace period of max_records records.
*/
void ssl_set_renegotiation_enforced( ssl_context *ssl, int max_records );
/**
* \brief Set record counter threshold for periodic renegotiation.
* (Default: 2^64 - 256.)
*
* Renegotiation is automatically triggered when a record
* counter (outgoing or ingoing) crosses the defined
* threshold. The default value is meant to prevent the
* connection from being closed when the counter is about to
* reached its maximal value (it is not allowed to wrap).
*
* Lower values can be used to enforce policies such as "keys
* must be refreshed every N packets with cipher X".
*
* \param ssl SSL context
* \param period The threshold value: a big-endian 64-bit number.
* Set to 2^64 - 1 to disable periodic renegotiation
*/
void ssl_set_renegotiation_period( ssl_context *ssl,
const unsigned char period[8] );
#endif /* POLARSSL_SSL_RENEGOTIATION */
/**
* \brief Return the number of data bytes available to read
*
* \param ssl SSL context
*
* \return how many bytes are available in the read buffer
*/
size_t ssl_get_bytes_avail( const ssl_context *ssl );
/**
* \brief Return the result of the certificate verification
*
* \param ssl SSL context
*
* \return 0 if successful,
* -1 if result is not available (eg because the handshake was
* aborted too early), or
* a combination of BADCERT_xxx and BADCRL_xxx flags, see
* x509.h
*/
int ssl_get_verify_result( const ssl_context *ssl );
/**
* \brief Return the name of the current ciphersuite
*
* \param ssl SSL context
*
* \return a string containing the ciphersuite name
*/
const char *ssl_get_ciphersuite( const ssl_context *ssl );
/**
* \brief Return the current SSL version (SSLv3/TLSv1/etc)
*
* \param ssl SSL context
*
* \return a string containing the SSL version
*/
const char *ssl_get_version( const ssl_context *ssl );
/**
* \brief Return the (maximum) number of bytes added by the record
* layer: header + encryption/MAC overhead (inc. padding)
*
* \param ssl SSL context
*
* \return Current maximum record expansion in bytes, or
* POLARSSL_ERR_FEATURE_UNAVAILABLE if compression is enabled,
* which makes expansion much less predictable
*/
int ssl_get_record_expansion( const ssl_context *ssl );
#if defined(POLARSSL_X509_CRT_PARSE_C)
/**
* \brief Return the peer certificate from the current connection
*
* Note: Can be NULL in case no certificate was sent during
* the handshake. Different calls for the same connection can
* return the same or different pointers for the same
* certificate and even a different certificate altogether.
* The peer cert CAN change in a single connection if
* renegotiation is performed.
*
* \param ssl SSL context
*
* \return the current peer certificate
*/
const x509_crt *ssl_get_peer_cert( const ssl_context *ssl );
#endif /* POLARSSL_X509_CRT_PARSE_C */
#if defined(POLARSSL_SSL_CLI_C)
/**
* \brief Save session in order to resume it later (client-side only)
* Session data is copied to presented session structure.
*
* \warning Currently, peer certificate is lost in the operation.
*
* \param ssl SSL context
* \param session session context
*
* \return 0 if successful,
* POLARSSL_ERR_SSL_MALLOC_FAILED if memory allocation failed,
* POLARSSL_ERR_SSL_BAD_INPUT_DATA if used server-side or
* arguments are otherwise invalid
*
* \sa ssl_set_session()
*/
int ssl_get_session( const ssl_context *ssl, ssl_session *session );
#endif /* POLARSSL_SSL_CLI_C */
/**
* \brief Perform the SSL handshake
*
* \param ssl SSL context
*
* \return 0 if successful, POLARSSL_ERR_NET_WANT_READ,
* POLARSSL_ERR_NET_WANT_WRITE, or a specific SSL error code.
*/
int ssl_handshake( ssl_context *ssl );
/**
* \brief Perform a single step of the SSL handshake
*
* Note: the state of the context (ssl->state) will be at
* the following state after execution of this function.
* Do not call this function if state is SSL_HANDSHAKE_OVER.
*
* \param ssl SSL context
*
* \return 0 if successful, POLARSSL_ERR_NET_WANT_READ,
* POLARSSL_ERR_NET_WANT_WRITE, or a specific SSL error code.
*/
int ssl_handshake_step( ssl_context *ssl );
#if defined(POLARSSL_SSL_RENEGOTIATION)
/**
* \brief Initiate an SSL renegotiation on the running connection.
* Client: perform the renegotiation right now.
* Server: request renegotiation, which will be performed
* during the next call to ssl_read() if honored by client.
*
* \param ssl SSL context
*
* \return 0 if successful, or any ssl_handshake() return value.
*/
int ssl_renegotiate( ssl_context *ssl );
#endif /* POLARSSL_SSL_RENEGOTIATION */
/**
* \brief Read at most 'len' application data bytes
*
* \param ssl SSL context
* \param buf buffer that will hold the data
* \param len maximum number of bytes to read
*
* \return This function returns the number of bytes read, 0 for EOF,
* or a negative error code.
*/
int ssl_read( ssl_context *ssl, unsigned char *buf, size_t len );
/**
* \brief Write exactly 'len' application data bytes
*
* \param ssl SSL context
* \param buf buffer holding the data
* \param len how many bytes must be written
*
* \return This function returns the number of bytes written,
* or a negative error code.
*
* \note When this function returns POLARSSL_ERR_NET_WANT_WRITE,
* it must be called later with the *same* arguments,
* until it returns a positive value.
*
* \note If the requested length is greater than the maximum
* fragment length (either the built-in limit or the one set
* or negotiated with the peer), then:
* - with TLS, less bytes than requested are written. (In
* order to write larger messages, this function should be
* called in a loop.)
* - with DTLS, POLARSSL_ERR_SSL_BAD_INPUT_DATA is returned.
*/
int ssl_write( ssl_context *ssl, const unsigned char *buf, size_t len );
/**
* \brief Send an alert message
*
* \param ssl SSL context
* \param level The alert level of the message
* (SSL_ALERT_LEVEL_WARNING or SSL_ALERT_LEVEL_FATAL)
* \param message The alert message (SSL_ALERT_MSG_*)
*
* \return 0 if successful, or a specific SSL error code.
*/
int ssl_send_alert_message( ssl_context *ssl,
unsigned char level,
unsigned char message );
/**
* \brief Notify the peer that the connection is being closed
*
* \param ssl SSL context
*/
int ssl_close_notify( ssl_context *ssl );
/**
* \brief Free referenced items in an SSL context and clear memory
*
* \param ssl SSL context
*/
void ssl_free( ssl_context *ssl );
/**
* \brief Initialize SSL session structure
*
* \param session SSL session
*/
void ssl_session_init( ssl_session *session );
/**
* \brief Free referenced items in an SSL session including the
* peer certificate and clear memory
*
* \param session SSL session
*/
void ssl_session_free( ssl_session *session );
/**
* \brief Free referenced items in an SSL transform context and clear
* memory
*
* \param transform SSL transform context
*/
void ssl_transform_free( ssl_transform *transform );
/**
* \brief Free referenced items in an SSL handshake context and clear
* memory
*
* \param handshake SSL handshake context
*/
void ssl_handshake_free( ssl_handshake_params *handshake );
/*
* Internal functions (do not call directly)
*/
int ssl_handshake_client_step( ssl_context *ssl );
int ssl_handshake_server_step( ssl_context *ssl );
void ssl_handshake_wrapup( ssl_context *ssl );
int ssl_send_fatal_handshake_failure( ssl_context *ssl );
void ssl_reset_checksum( ssl_context *ssl );
int ssl_derive_keys( ssl_context *ssl );
int ssl_read_record( ssl_context *ssl );
int ssl_fetch_input( ssl_context *ssl, size_t nb_want );
int ssl_write_record( ssl_context *ssl );
int ssl_flush_output( ssl_context *ssl );
int ssl_parse_certificate( ssl_context *ssl );
int ssl_write_certificate( ssl_context *ssl );
int ssl_parse_change_cipher_spec( ssl_context *ssl );
int ssl_write_change_cipher_spec( ssl_context *ssl );
int ssl_parse_finished( ssl_context *ssl );
int ssl_write_finished( ssl_context *ssl );
void ssl_optimize_checksum( ssl_context *ssl,
const ssl_ciphersuite_t *ciphersuite_info );
#if defined(POLARSSL_KEY_EXCHANGE__SOME__PSK_ENABLED)
int ssl_psk_derive_premaster( ssl_context *ssl, key_exchange_type_t key_ex );
#endif
#if defined(POLARSSL_PK_C)
unsigned char ssl_sig_from_pk( pk_context *pk );
pk_type_t ssl_pk_alg_from_sig( unsigned char sig );
#endif
md_type_t ssl_md_alg_from_hash( unsigned char hash );
#if defined(POLARSSL_SSL_SET_CURVES)
int ssl_curve_is_acceptable( const ssl_context *ssl, ecp_group_id grp_id );
#endif
#if defined(POLARSSL_X509_CRT_PARSE_C)
static inline pk_context *ssl_own_key( ssl_context *ssl )
{
return( ssl->handshake->key_cert == NULL ? NULL
: ssl->handshake->key_cert->key );
}
static inline x509_crt *ssl_own_cert( ssl_context *ssl )
{
return( ssl->handshake->key_cert == NULL ? NULL
: ssl->handshake->key_cert->cert );
}
/*
* Check usage of a certificate wrt extensions:
* keyUsage, extendedKeyUsage (later), and nSCertType (later).
*
* Warning: cert_endpoint is the endpoint of the cert (ie, of our peer when we
* check a cert we received from them)!
*
* Return 0 if everything is OK, -1 if not.
*/
int ssl_check_cert_usage( const x509_crt *cert,
const ssl_ciphersuite_t *ciphersuite,
int cert_endpoint );
#endif /* POLARSSL_X509_CRT_PARSE_C */
void ssl_write_version( int major, int minor, int transport,
unsigned char ver[2] );
void ssl_read_version( int *major, int *minor, int transport,
const unsigned char ver[2] );
static inline size_t ssl_hdr_len( const ssl_context *ssl )
{
#if defined(POLARSSL_SSL_PROTO_DTLS)
if( ssl->transport == SSL_TRANSPORT_DATAGRAM )
return( 13 );
#else
((void) ssl);
#endif
return( 5 );
}
static inline size_t ssl_hs_hdr_len( const ssl_context *ssl )
{
#if defined(POLARSSL_SSL_PROTO_DTLS)
if( ssl->transport == SSL_TRANSPORT_DATAGRAM )
return( 12 );
#else
((void) ssl);
#endif
return( 4 );
}
#if defined(POLARSSL_SSL_PROTO_DTLS)
void ssl_send_flight_completed( ssl_context *ssl );
void ssl_recv_flight_completed( ssl_context *ssl );
int ssl_resend( ssl_context *ssl );
#endif
/* Visible for testing purposes only */
#if defined(POLARSSL_SSL_DTLS_ANTI_REPLAY)
int ssl_dtls_replay_check( ssl_context *ssl );
void ssl_dtls_replay_update( ssl_context *ssl );
#endif
/* constant-time buffer comparison */
static inline int safer_memcmp( const void *a, const void *b, size_t n )
{
size_t i;
const unsigned char *A = (const unsigned char *) a;
const unsigned char *B = (const unsigned char *) b;
unsigned char diff = 0;
for( i = 0; i < n; i++ )
diff |= A[i] ^ B[i];
return( diff );
}
#ifdef __cplusplus
}
#endif
#endif /* ssl.h */