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/**
* \ file ssl . h
*
* \ brief SSL / TLS functions .
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*/
/*
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* Copyright ( C ) 2006 - 2015 , ARM Limited , All Rights Reserved
* SPDX - License - Identifier : Apache - 2.0
*
* Licensed under the Apache License , Version 2.0 ( the " License " ) ; you may
* not use this file except in compliance with the License .
* You may obtain a copy of the License at
*
* http : //www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing , software
* distributed under the License is distributed on an " AS IS " BASIS , WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND , either express or implied .
* See the License for the specific language governing permissions and
* limitations under the License .
*
* This file is part of mbed TLS ( https : //tls.mbed.org)
*/
# ifndef MBEDTLS_SSL_H
# define MBEDTLS_SSL_H
# if !defined(MBEDTLS_CONFIG_FILE)
# include "config.h"
# else
# include MBEDTLS_CONFIG_FILE
# endif
# include "bignum.h"
# include "ecp.h"
# include "ssl_ciphersuites.h"
# if defined(MBEDTLS_X509_CRT_PARSE_C)
# include "x509_crt.h"
# include "x509_crl.h"
# endif
# if defined(MBEDTLS_DHM_C)
# include "dhm.h"
# endif
# if defined(MBEDTLS_ECDH_C)
# include "ecdh.h"
# endif
# if defined(MBEDTLS_ZLIB_SUPPORT)
# include "zlib.h"
# endif
# if defined(MBEDTLS_HAVE_TIME)
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# include "platform_time.h"
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# endif
/*
* SSL Error codes
*/
# define MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE -0x7080 /**< The requested feature is not available. */
# define MBEDTLS_ERR_SSL_BAD_INPUT_DATA -0x7100 /**< Bad input parameters to function. */
# define MBEDTLS_ERR_SSL_INVALID_MAC -0x7180 /**< Verification of the message MAC failed. */
# define MBEDTLS_ERR_SSL_INVALID_RECORD -0x7200 /**< An invalid SSL record was received. */
# define MBEDTLS_ERR_SSL_CONN_EOF -0x7280 /**< The connection indicated an EOF. */
# define MBEDTLS_ERR_SSL_UNKNOWN_CIPHER -0x7300 /**< An unknown cipher was received. */
# define MBEDTLS_ERR_SSL_NO_CIPHER_CHOSEN -0x7380 /**< The server has no ciphersuites in common with the client. */
# define MBEDTLS_ERR_SSL_NO_RNG -0x7400 /**< No RNG was provided to the SSL module. */
# define MBEDTLS_ERR_SSL_NO_CLIENT_CERTIFICATE -0x7480 /**< No client certification received from the client, but required by the authentication mode. */
# define MBEDTLS_ERR_SSL_CERTIFICATE_TOO_LARGE -0x7500 /**< Our own certificate(s) is/are too large to send in an SSL message. */
# define MBEDTLS_ERR_SSL_CERTIFICATE_REQUIRED -0x7580 /**< The own certificate is not set, but needed by the server. */
# define MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED -0x7600 /**< The own private key or pre-shared key is not set, but needed. */
# define MBEDTLS_ERR_SSL_CA_CHAIN_REQUIRED -0x7680 /**< No CA Chain is set, but required to operate. */
# define MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE -0x7700 /**< An unexpected message was received from our peer. */
# define MBEDTLS_ERR_SSL_FATAL_ALERT_MESSAGE -0x7780 /**< A fatal alert message was received from our peer. */
# define MBEDTLS_ERR_SSL_PEER_VERIFY_FAILED -0x7800 /**< Verification of our peer failed. */
# define MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY -0x7880 /**< The peer notified us that the connection is going to be closed. */
# define MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO -0x7900 /**< Processing of the ClientHello handshake message failed. */
# define MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO -0x7980 /**< Processing of the ServerHello handshake message failed. */
# define MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE -0x7A00 /**< Processing of the Certificate handshake message failed. */
# define MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST -0x7A80 /**< Processing of the CertificateRequest handshake message failed. */
# define MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE -0x7B00 /**< Processing of the ServerKeyExchange handshake message failed. */
# define MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO_DONE -0x7B80 /**< Processing of the ServerHelloDone handshake message failed. */
# define MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE -0x7C00 /**< Processing of the ClientKeyExchange handshake message failed. */
# define MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_RP -0x7C80 /**< Processing of the ClientKeyExchange handshake message failed in DHM / ECDH Read Public. */
# define MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_CS -0x7D00 /**< Processing of the ClientKeyExchange handshake message failed in DHM / ECDH Calculate Secret. */
# define MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY -0x7D80 /**< Processing of the CertificateVerify handshake message failed. */
# define MBEDTLS_ERR_SSL_BAD_HS_CHANGE_CIPHER_SPEC -0x7E00 /**< Processing of the ChangeCipherSpec handshake message failed. */
# define MBEDTLS_ERR_SSL_BAD_HS_FINISHED -0x7E80 /**< Processing of the Finished handshake message failed. */
# define MBEDTLS_ERR_SSL_ALLOC_FAILED -0x7F00 /**< Memory allocation failed */
# define MBEDTLS_ERR_SSL_HW_ACCEL_FAILED -0x7F80 /**< Hardware acceleration function returned with error */
# define MBEDTLS_ERR_SSL_HW_ACCEL_FALLTHROUGH -0x6F80 /**< Hardware acceleration function skipped / left alone data */
# define MBEDTLS_ERR_SSL_COMPRESSION_FAILED -0x6F00 /**< Processing of the compression / decompression failed */
# define MBEDTLS_ERR_SSL_BAD_HS_PROTOCOL_VERSION -0x6E80 /**< Handshake protocol not within min/max boundaries */
# define MBEDTLS_ERR_SSL_BAD_HS_NEW_SESSION_TICKET -0x6E00 /**< Processing of the NewSessionTicket handshake message failed. */
# define MBEDTLS_ERR_SSL_SESSION_TICKET_EXPIRED -0x6D80 /**< Session ticket has expired. */
# define MBEDTLS_ERR_SSL_PK_TYPE_MISMATCH -0x6D00 /**< Public key type mismatch (eg, asked for RSA key exchange and presented EC key) */
# define MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY -0x6C80 /**< Unknown identity received (eg, PSK identity) */
# define MBEDTLS_ERR_SSL_INTERNAL_ERROR -0x6C00 /**< Internal error (eg, unexpected failure in lower-level module) */
# define MBEDTLS_ERR_SSL_COUNTER_WRAPPING -0x6B80 /**< A counter would wrap (eg, too many messages exchanged). */
# define MBEDTLS_ERR_SSL_WAITING_SERVER_HELLO_RENEGO -0x6B00 /**< Unexpected message at ServerHello in renegotiation. */
# define MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED -0x6A80 /**< DTLS client must retry for hello verification */
# define MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL -0x6A00 /**< A buffer is too small to receive or write a message */
# define MBEDTLS_ERR_SSL_NO_USABLE_CIPHERSUITE -0x6980 /**< None of the common ciphersuites is usable (eg, no suitable certificate, see debug messages). */
# define MBEDTLS_ERR_SSL_WANT_READ -0x6900 /**< Connection requires a read call. */
# define MBEDTLS_ERR_SSL_WANT_WRITE -0x6880 /**< Connection requires a write call. */
# define MBEDTLS_ERR_SSL_TIMEOUT -0x6800 /**< The operation timed out. */
# define MBEDTLS_ERR_SSL_CLIENT_RECONNECT -0x6780 /**< The client initiated a reconnect from the same port. */
# define MBEDTLS_ERR_SSL_UNEXPECTED_RECORD -0x6700 /**< Record header looks valid but is not expected. */
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# define MBEDTLS_ERR_SSL_NON_FATAL -0x6680 /**< The alert message received indicates a non-fatal error. */
# define MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH -0x6600 /**< Couldn't set the hash for verifying CertificateVerify */
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/*
* Various constants
*/
# define MBEDTLS_SSL_MAJOR_VERSION_3 3
# define MBEDTLS_SSL_MINOR_VERSION_0 0 /*!< SSL v3.0 */
# define MBEDTLS_SSL_MINOR_VERSION_1 1 /*!< TLS v1.0 */
# define MBEDTLS_SSL_MINOR_VERSION_2 2 /*!< TLS v1.1 */
# define MBEDTLS_SSL_MINOR_VERSION_3 3 /*!< TLS v1.2 */
# define MBEDTLS_SSL_TRANSPORT_STREAM 0 /*!< TLS */
# define MBEDTLS_SSL_TRANSPORT_DATAGRAM 1 /*!< DTLS */
# define MBEDTLS_SSL_MAX_HOST_NAME_LEN 255 /*!< Maximum host name defined in RFC 1035 */
/* 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 MBEDTLS_SSL_MAX_FRAG_LEN_NONE 0 /*!< don't use this extension */
# define MBEDTLS_SSL_MAX_FRAG_LEN_512 1 /*!< MaxFragmentLength 2^9 */
# define MBEDTLS_SSL_MAX_FRAG_LEN_1024 2 /*!< MaxFragmentLength 2^10 */
# define MBEDTLS_SSL_MAX_FRAG_LEN_2048 3 /*!< MaxFragmentLength 2^11 */
# define MBEDTLS_SSL_MAX_FRAG_LEN_4096 4 /*!< MaxFragmentLength 2^12 */
# define MBEDTLS_SSL_MAX_FRAG_LEN_INVALID 5 /*!< first invalid value */
# define MBEDTLS_SSL_IS_CLIENT 0
# define MBEDTLS_SSL_IS_SERVER 1
# define MBEDTLS_SSL_IS_NOT_FALLBACK 0
# define MBEDTLS_SSL_IS_FALLBACK 1
# define MBEDTLS_SSL_EXTENDED_MS_DISABLED 0
# define MBEDTLS_SSL_EXTENDED_MS_ENABLED 1
# define MBEDTLS_SSL_ETM_DISABLED 0
# define MBEDTLS_SSL_ETM_ENABLED 1
# define MBEDTLS_SSL_COMPRESS_NULL 0
# define MBEDTLS_SSL_COMPRESS_DEFLATE 1
# define MBEDTLS_SSL_VERIFY_NONE 0
# define MBEDTLS_SSL_VERIFY_OPTIONAL 1
# define MBEDTLS_SSL_VERIFY_REQUIRED 2
# define MBEDTLS_SSL_VERIFY_UNSET 3 /* Used only for sni_authmode */
# define MBEDTLS_SSL_LEGACY_RENEGOTIATION 0
# define MBEDTLS_SSL_SECURE_RENEGOTIATION 1
# define MBEDTLS_SSL_RENEGOTIATION_DISABLED 0
# define MBEDTLS_SSL_RENEGOTIATION_ENABLED 1
# define MBEDTLS_SSL_ANTI_REPLAY_DISABLED 0
# define MBEDTLS_SSL_ANTI_REPLAY_ENABLED 1
# define MBEDTLS_SSL_RENEGOTIATION_NOT_ENFORCED -1
# define MBEDTLS_SSL_RENEGO_MAX_RECORDS_DEFAULT 16
# define MBEDTLS_SSL_LEGACY_NO_RENEGOTIATION 0
# define MBEDTLS_SSL_LEGACY_ALLOW_RENEGOTIATION 1
# define MBEDTLS_SSL_LEGACY_BREAK_HANDSHAKE 2
# define MBEDTLS_SSL_TRUNC_HMAC_DISABLED 0
# define MBEDTLS_SSL_TRUNC_HMAC_ENABLED 1
# define MBEDTLS_SSL_TRUNCATED_HMAC_LEN 10 /* 80 bits, rfc 6066 section 7 */
# define MBEDTLS_SSL_SESSION_TICKETS_DISABLED 0
# define MBEDTLS_SSL_SESSION_TICKETS_ENABLED 1
# define MBEDTLS_SSL_CBC_RECORD_SPLITTING_DISABLED 0
# define MBEDTLS_SSL_CBC_RECORD_SPLITTING_ENABLED 1
# define MBEDTLS_SSL_ARC4_ENABLED 0
# define MBEDTLS_SSL_ARC4_DISABLED 1
# define MBEDTLS_SSL_PRESET_DEFAULT 0
# define MBEDTLS_SSL_PRESET_SUITEB 2
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# define MBEDTLS_SSL_CERT_REQ_CA_LIST_ENABLED 1
# define MBEDTLS_SSL_CERT_REQ_CA_LIST_DISABLED 0
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/*
* Default range for DTLS retransmission timer value , in milliseconds .
* RFC 6347 4.2 .4 .1 says from 1 second to 60 seconds .
*/
# define MBEDTLS_SSL_DTLS_TIMEOUT_DFL_MIN 1000
# define MBEDTLS_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(MBEDTLS_SSL_DEFAULT_TICKET_LIFETIME)
# define MBEDTLS_SSL_DEFAULT_TICKET_LIFETIME 86400 /**< Lifetime of session tickets (if enabled) */
# endif
/*
* Maxium fragment length in bytes ,
* determines the size of each of the two internal I / O buffers .
*
* 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(MBEDTLS_SSL_MAX_CONTENT_LEN)
# define MBEDTLS_SSL_MAX_CONTENT_LEN 16384 /**< Size of the input / output buffer */
# endif
/* \} name SECTION: Module settings */
/*
* Length of the verify data for secure renegotiation
*/
# if defined(MBEDTLS_SSL_PROTO_SSL3)
# define MBEDTLS_SSL_VERIFY_DATA_MAX_LEN 36
# else
# define MBEDTLS_SSL_VERIFY_DATA_MAX_LEN 12
# endif
/*
* Signaling ciphersuite values ( SCSV )
*/
# define MBEDTLS_SSL_EMPTY_RENEGOTIATION_INFO 0xFF /**< renegotiation info ext */
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# define MBEDTLS_SSL_FALLBACK_SCSV_VALUE 0x5600 /**< RFC 7507 section 2 */
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/*
* Supported Signature and Hash algorithms ( For TLS 1.2 )
* RFC 5246 section 7.4 .1 .4 .1
*/
# define MBEDTLS_SSL_HASH_NONE 0
# define MBEDTLS_SSL_HASH_MD5 1
# define MBEDTLS_SSL_HASH_SHA1 2
# define MBEDTLS_SSL_HASH_SHA224 3
# define MBEDTLS_SSL_HASH_SHA256 4
# define MBEDTLS_SSL_HASH_SHA384 5
# define MBEDTLS_SSL_HASH_SHA512 6
# define MBEDTLS_SSL_SIG_ANON 0
# define MBEDTLS_SSL_SIG_RSA 1
# define MBEDTLS_SSL_SIG_ECDSA 3
/*
* Client Certificate Types
* RFC 5246 section 7.4 .4 plus RFC 4492 section 5.5
*/
# define MBEDTLS_SSL_CERT_TYPE_RSA_SIGN 1
# define MBEDTLS_SSL_CERT_TYPE_ECDSA_SIGN 64
/*
* Message , alert and handshake types
*/
# define MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC 20
# define MBEDTLS_SSL_MSG_ALERT 21
# define MBEDTLS_SSL_MSG_HANDSHAKE 22
# define MBEDTLS_SSL_MSG_APPLICATION_DATA 23
# define MBEDTLS_SSL_ALERT_LEVEL_WARNING 1
# define MBEDTLS_SSL_ALERT_LEVEL_FATAL 2
# define MBEDTLS_SSL_ALERT_MSG_CLOSE_NOTIFY 0 /* 0x00 */
# define MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE 10 /* 0x0A */
# define MBEDTLS_SSL_ALERT_MSG_BAD_RECORD_MAC 20 /* 0x14 */
# define MBEDTLS_SSL_ALERT_MSG_DECRYPTION_FAILED 21 /* 0x15 */
# define MBEDTLS_SSL_ALERT_MSG_RECORD_OVERFLOW 22 /* 0x16 */
# define MBEDTLS_SSL_ALERT_MSG_DECOMPRESSION_FAILURE 30 /* 0x1E */
# define MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE 40 /* 0x28 */
# define MBEDTLS_SSL_ALERT_MSG_NO_CERT 41 /* 0x29 */
# define MBEDTLS_SSL_ALERT_MSG_BAD_CERT 42 /* 0x2A */
# define MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT 43 /* 0x2B */
# define MBEDTLS_SSL_ALERT_MSG_CERT_REVOKED 44 /* 0x2C */
# define MBEDTLS_SSL_ALERT_MSG_CERT_EXPIRED 45 /* 0x2D */
# define MBEDTLS_SSL_ALERT_MSG_CERT_UNKNOWN 46 /* 0x2E */
# define MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER 47 /* 0x2F */
# define MBEDTLS_SSL_ALERT_MSG_UNKNOWN_CA 48 /* 0x30 */
# define MBEDTLS_SSL_ALERT_MSG_ACCESS_DENIED 49 /* 0x31 */
# define MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR 50 /* 0x32 */
# define MBEDTLS_SSL_ALERT_MSG_DECRYPT_ERROR 51 /* 0x33 */
# define MBEDTLS_SSL_ALERT_MSG_EXPORT_RESTRICTION 60 /* 0x3C */
# define MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION 70 /* 0x46 */
# define MBEDTLS_SSL_ALERT_MSG_INSUFFICIENT_SECURITY 71 /* 0x47 */
# define MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR 80 /* 0x50 */
# define MBEDTLS_SSL_ALERT_MSG_INAPROPRIATE_FALLBACK 86 /* 0x56 */
# define MBEDTLS_SSL_ALERT_MSG_USER_CANCELED 90 /* 0x5A */
# define MBEDTLS_SSL_ALERT_MSG_NO_RENEGOTIATION 100 /* 0x64 */
# define MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_EXT 110 /* 0x6E */
# define MBEDTLS_SSL_ALERT_MSG_UNRECOGNIZED_NAME 112 /* 0x70 */
# define MBEDTLS_SSL_ALERT_MSG_UNKNOWN_PSK_IDENTITY 115 /* 0x73 */
# define MBEDTLS_SSL_ALERT_MSG_NO_APPLICATION_PROTOCOL 120 /* 0x78 */
# define MBEDTLS_SSL_HS_HELLO_REQUEST 0
# define MBEDTLS_SSL_HS_CLIENT_HELLO 1
# define MBEDTLS_SSL_HS_SERVER_HELLO 2
# define MBEDTLS_SSL_HS_HELLO_VERIFY_REQUEST 3
# define MBEDTLS_SSL_HS_NEW_SESSION_TICKET 4
# define MBEDTLS_SSL_HS_CERTIFICATE 11
# define MBEDTLS_SSL_HS_SERVER_KEY_EXCHANGE 12
# define MBEDTLS_SSL_HS_CERTIFICATE_REQUEST 13
# define MBEDTLS_SSL_HS_SERVER_HELLO_DONE 14
# define MBEDTLS_SSL_HS_CERTIFICATE_VERIFY 15
# define MBEDTLS_SSL_HS_CLIENT_KEY_EXCHANGE 16
# define MBEDTLS_SSL_HS_FINISHED 20
/*
* TLS extensions
*/
# define MBEDTLS_TLS_EXT_SERVERNAME 0
# define MBEDTLS_TLS_EXT_SERVERNAME_HOSTNAME 0
# define MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH 1
# define MBEDTLS_TLS_EXT_TRUNCATED_HMAC 4
# define MBEDTLS_TLS_EXT_SUPPORTED_ELLIPTIC_CURVES 10
# define MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS 11
# define MBEDTLS_TLS_EXT_SIG_ALG 13
# define MBEDTLS_TLS_EXT_ALPN 16
# define MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC 22 /* 0x16 */
# define MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET 0x0017 /* 23 */
# define MBEDTLS_TLS_EXT_SESSION_TICKET 35
# define MBEDTLS_TLS_EXT_ECJPAKE_KKPP 256 /* experimental */
# define MBEDTLS_TLS_EXT_RENEGOTIATION_INFO 0xFF01
/*
* Size defines
*/
# if !defined(MBEDTLS_PSK_MAX_LEN)
# define MBEDTLS_PSK_MAX_LEN 32 /* 256 bits */
# endif
/* Dummy type used only for its size */
union mbedtls_ssl_premaster_secret
{
# if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED)
unsigned char _pms_rsa [ 48 ] ; /* RFC 5246 8.1.1 */
# endif
# if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED)
unsigned char _pms_dhm [ MBEDTLS_MPI_MAX_SIZE ] ; /* RFC 5246 8.1.2 */
# endif
# if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \
defined ( MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED ) | | \
defined ( MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED ) | | \
defined ( MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED )
unsigned char _pms_ecdh [ MBEDTLS_ECP_MAX_BYTES ] ; /* RFC 4492 5.10 */
# endif
# if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED)
unsigned char _pms_psk [ 4 + 2 * MBEDTLS_PSK_MAX_LEN ] ; /* RFC 4279 2 */
# endif
# if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED)
unsigned char _pms_dhe_psk [ 4 + MBEDTLS_MPI_MAX_SIZE
+ MBEDTLS_PSK_MAX_LEN ] ; /* RFC 4279 3 */
# endif
# if defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED)
unsigned char _pms_rsa_psk [ 52 + MBEDTLS_PSK_MAX_LEN ] ; /* RFC 4279 4 */
# endif
# if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
unsigned char _pms_ecdhe_psk [ 4 + MBEDTLS_ECP_MAX_BYTES
+ MBEDTLS_PSK_MAX_LEN ] ; /* RFC 5489 2 */
# endif
# if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
unsigned char _pms_ecjpake [ 32 ] ; /* Thread spec: SHA-256 output */
# endif
} ;
# define MBEDTLS_PREMASTER_SIZE sizeof( union mbedtls_ssl_premaster_secret )
# ifdef __cplusplus
extern " C " {
# endif
/*
* SSL state machine
*/
typedef enum
{
MBEDTLS_SSL_HELLO_REQUEST ,
MBEDTLS_SSL_CLIENT_HELLO ,
MBEDTLS_SSL_SERVER_HELLO ,
MBEDTLS_SSL_SERVER_CERTIFICATE ,
MBEDTLS_SSL_SERVER_KEY_EXCHANGE ,
MBEDTLS_SSL_CERTIFICATE_REQUEST ,
MBEDTLS_SSL_SERVER_HELLO_DONE ,
MBEDTLS_SSL_CLIENT_CERTIFICATE ,
MBEDTLS_SSL_CLIENT_KEY_EXCHANGE ,
MBEDTLS_SSL_CERTIFICATE_VERIFY ,
MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC ,
MBEDTLS_SSL_CLIENT_FINISHED ,
MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC ,
MBEDTLS_SSL_SERVER_FINISHED ,
MBEDTLS_SSL_FLUSH_BUFFERS ,
MBEDTLS_SSL_HANDSHAKE_WRAPUP ,
MBEDTLS_SSL_HANDSHAKE_OVER ,
MBEDTLS_SSL_SERVER_NEW_SESSION_TICKET ,
MBEDTLS_SSL_SERVER_HELLO_VERIFY_REQUEST_SENT ,
}
mbedtls_ssl_states ;
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/**
* \ brief Callback type : send data on the network .
*
* \ note That callback may be either blocking or non - blocking .
*
* \ param ctx Context for the send callback ( typically a file descriptor )
* \ param buf Buffer holding the data to send
* \ param len Length of the data to send
*
* \ return The callback must return the number of bytes sent if any ,
* or a non - zero error code .
* If performing non - blocking I / O , \ c MBEDTLS_ERR_SSL_WANT_WRITE
* must be returned when the operation would block .
*
* \ note The callback is allowed to send fewer bytes than requested .
* It must always return the number of bytes actually sent .
*/
typedef int mbedtls_ssl_send_t ( void * ctx ,
const unsigned char * buf ,
size_t len ) ;
/**
* \ brief Callback type : receive data from the network .
*
* \ note That callback may be either blocking or non - blocking .
*
* \ param ctx Context for the receive callback ( typically a file
* descriptor )
* \ param buf Buffer to write the received data to
* \ param len Length of the receive buffer
*
* \ return The callback must return the number of bytes received ,
* or a non - zero error code .
* If performing non - blocking I / O , \ c MBEDTLS_ERR_SSL_WANT_READ
* must be returned when the operation would block .
*
* \ note The callback may receive fewer bytes than the length of the
* buffer . It must always return the number of bytes actually
* received and written to the buffer .
*/
typedef int mbedtls_ssl_recv_t ( void * ctx ,
unsigned char * buf ,
size_t len ) ;
/**
* \ brief Callback type : receive data from the network , with timeout
*
* \ note That callback must block until data is received , or the
* timeout delay expires , or the operation is interrupted by a
* signal .
*
* \ param ctx Context for the receive callback ( typically a file descriptor )
* \ param buf Buffer to write the received data to
* \ param len Length of the receive buffer
* \ param timeout Maximum nomber of millisecondes to wait for data
* 0 means no timeout ( potentially waiting forever )
*
* \ return The callback must return the number of bytes received ,
* or a non - zero error code :
* \ c MBEDTLS_ERR_SSL_TIMEOUT if the operation timed out ,
* \ c MBEDTLS_ERR_SSL_WANT_READ if interrupted by a signal .
*
* \ note The callback may receive fewer bytes than the length of the
* buffer . It must always return the number of bytes actually
* received and written to the buffer .
*/
typedef int mbedtls_ssl_recv_timeout_t ( void * ctx ,
unsigned char * buf ,
size_t len ,
uint32_t timeout ) ;
/**
* \ brief Callback type : set a pair of timers / delays to watch
*
* \ param ctx Context pointer
* \ param int_ms Intermediate delay in milliseconds
* \ param fin_ms Final delay in milliseconds
* 0 cancels the current timer .
*
* \ note This callback must at least store the necessary information
* for the associated \ c mbedtls_ssl_get_timer_t callback to
* return correct information .
*
* \ note If using a event - driven style of programming , an event must
* be generated when the final delay is passed . The event must
* cause a call to \ c mbedtls_ssl_handshake ( ) with the proper
* SSL context to be scheduled . Care must be taken to ensure
* that at most one such call happens at a time .
*
* \ note Only one timer at a time must be running . Calling this
* function while a timer is running must cancel it . Cancelled
* timers must not generate any event .
*/
typedef void mbedtls_ssl_set_timer_t ( void * ctx ,
uint32_t int_ms ,
uint32_t fin_ms ) ;
/**
* \ brief Callback type : get status of timers / delays
*
* \ param ctx Context pointer
*
* \ return This callback must return :
* - 1 if cancelled ( fin_ms = = 0 ) ,
* 0 if none of the delays have passed ,
* 1 if only the intermediate delay has passed ,
* 2 if the final delay has passed .
*/
typedef int mbedtls_ssl_get_timer_t ( void * ctx ) ;
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/* Defined below */
typedef struct mbedtls_ssl_session mbedtls_ssl_session ;
typedef struct mbedtls_ssl_context mbedtls_ssl_context ;
typedef struct mbedtls_ssl_config mbedtls_ssl_config ;
/* Defined in ssl_internal.h */
typedef struct mbedtls_ssl_transform mbedtls_ssl_transform ;
typedef struct mbedtls_ssl_handshake_params mbedtls_ssl_handshake_params ;
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typedef struct mbedtls_ssl_sig_hash_set_t mbedtls_ssl_sig_hash_set_t ;
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# if defined(MBEDTLS_X509_CRT_PARSE_C)
typedef struct mbedtls_ssl_key_cert mbedtls_ssl_key_cert ;
# endif
# if defined(MBEDTLS_SSL_PROTO_DTLS)
typedef struct mbedtls_ssl_flight_item mbedtls_ssl_flight_item ;
# endif
/*
* This structure is used for storing current session data .
*/
struct mbedtls_ssl_session
{
# if defined(MBEDTLS_HAVE_TIME)
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mbedtls_time_t start ; /*!< starting time */
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# endif
int ciphersuite ; /*!< chosen ciphersuite */
int compression ; /*!< chosen compression */
size_t id_len ; /*!< session id length */
unsigned char id [ 32 ] ; /*!< session identifier */
unsigned char master [ 48 ] ; /*!< the master secret */
# if defined(MBEDTLS_X509_CRT_PARSE_C)
mbedtls_x509_crt * peer_cert ; /*!< peer X.509 cert chain */
# endif /* MBEDTLS_X509_CRT_PARSE_C */
uint32_t verify_result ; /*!< verification result */
# if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C)
unsigned char * ticket ; /*!< RFC 5077 session ticket */
size_t ticket_len ; /*!< session ticket length */
uint32_t ticket_lifetime ; /*!< ticket lifetime hint */
# endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */
# if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
unsigned char mfl_code ; /*!< MaxFragmentLength negotiated by peer */
# endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
# if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
int trunc_hmac ; /*!< flag for truncated hmac activation */
# endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
# if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
int encrypt_then_mac ; /*!< flag for EtM activation */
# endif
} ;
/**
* SSL / TLS configuration to be shared between mbedtls_ssl_context structures .
*/
struct mbedtls_ssl_config
{
/* Group items by size (largest first) to minimize padding overhead */
/*
* Pointers
*/
const int * ciphersuite_list [ 4 ] ; /*!< allowed ciphersuites per version */
/** Callback for printing debug output */
void ( * f_dbg ) ( void * , int , const char * , int , const char * ) ;
void * p_dbg ; /*!< context for the debug function */
/** Callback for getting (pseudo-)random numbers */
int ( * f_rng ) ( void * , unsigned char * , size_t ) ;
void * p_rng ; /*!< context for the RNG function */
/** Callback to retrieve a session from the cache */
int ( * f_get_cache ) ( void * , mbedtls_ssl_session * ) ;
/** Callback to store a session into the cache */
int ( * f_set_cache ) ( void * , const mbedtls_ssl_session * ) ;
void * p_cache ; /*!< context for cache callbacks */
# if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
/** Callback for setting cert according to SNI extension */
int ( * f_sni ) ( void * , mbedtls_ssl_context * , const unsigned char * , size_t ) ;
void * p_sni ; /*!< context for SNI callback */
# endif
# if defined(MBEDTLS_X509_CRT_PARSE_C)
/** Callback to customize X.509 certificate chain verification */
int ( * f_vrfy ) ( void * , mbedtls_x509_crt * , int , uint32_t * ) ;
void * p_vrfy ; /*!< context for X.509 verify calllback */
# endif
# if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
/** Callback to retrieve PSK key from identity */
int ( * f_psk ) ( void * , mbedtls_ssl_context * , const unsigned char * , size_t ) ;
void * p_psk ; /*!< context for PSK callback */
# endif
# if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
/** Callback to create & write a cookie for ClientHello veirifcation */
int ( * f_cookie_write ) ( void * , unsigned char * * , unsigned char * ,
const unsigned char * , size_t ) ;
/** Callback to verify validity of a ClientHello cookie */
int ( * f_cookie_check ) ( void * , const unsigned char * , size_t ,
const unsigned char * , size_t ) ;
void * p_cookie ; /*!< context for the cookie callbacks */
# endif
# if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_SRV_C)
/** Callback to create & write a session ticket */
int ( * f_ticket_write ) ( void * , const mbedtls_ssl_session * ,
unsigned char * , const unsigned char * , size_t * , uint32_t * ) ;
/** Callback to parse a session ticket into a session structure */
int ( * f_ticket_parse ) ( void * , mbedtls_ssl_session * , unsigned char * , size_t ) ;
void * p_ticket ; /*!< context for the ticket callbacks */
# endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_SRV_C */
# if defined(MBEDTLS_SSL_EXPORT_KEYS)
/** Callback to export key block and master secret */
int ( * f_export_keys ) ( void * , const unsigned char * ,
const unsigned char * , size_t , size_t , size_t ) ;
void * p_export_keys ; /*!< context for key export callback */
# endif
# if defined(MBEDTLS_X509_CRT_PARSE_C)
const mbedtls_x509_crt_profile * cert_profile ; /*!< verification profile */
mbedtls_ssl_key_cert * key_cert ; /*!< own certificate/key pair(s) */
mbedtls_x509_crt * ca_chain ; /*!< trusted CAs */
mbedtls_x509_crl * ca_crl ; /*!< trusted CAs CRLs */
# endif /* MBEDTLS_X509_CRT_PARSE_C */
# if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
const int * sig_hashes ; /*!< allowed signature hashes */
# endif
# if defined(MBEDTLS_ECP_C)
const mbedtls_ecp_group_id * curve_list ; /*!< allowed curves */
# endif
# if defined(MBEDTLS_DHM_C)
mbedtls_mpi dhm_P ; /*!< prime modulus for DHM */
mbedtls_mpi dhm_G ; /*!< generator for DHM */
# endif
# if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
unsigned char * psk ; /*!< pre-shared key */
size_t psk_len ; /*!< length of the pre-shared key */
unsigned char * psk_identity ; /*!< identity for PSK negotiation */
size_t psk_identity_len ; /*!< length of identity */
# endif
# if defined(MBEDTLS_SSL_ALPN)
const char * * alpn_list ; /*!< ordered list of protocols */
# endif
/*
* Numerical settings ( int then char )
*/
uint32_t read_timeout ; /*!< timeout for mbedtls_ssl_read (ms) */
# if defined(MBEDTLS_SSL_PROTO_DTLS)
uint32_t hs_timeout_min ; /*!< initial value of the handshake
retransmission timeout ( ms ) */
uint32_t hs_timeout_max ; /*!< maximum value of the handshake
retransmission timeout ( ms ) */
# endif
# if defined(MBEDTLS_SSL_RENEGOTIATION)
int renego_max_records ; /*!< grace period for renegotiation */
unsigned char renego_period [ 8 ] ; /*!< value of the record counters
that triggers renegotiation */
# endif
# if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT)
unsigned int badmac_limit ; /*!< limit of records with a bad MAC */
# endif
# if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C)
unsigned int dhm_min_bitlen ; /*!< min. bit length of the DHM prime */
# endif
unsigned char max_major_ver ; /*!< max. major version used */
unsigned char max_minor_ver ; /*!< max. minor version used */
unsigned char min_major_ver ; /*!< min. major version used */
unsigned char min_minor_ver ; /*!< min. minor version used */
/*
* Flags ( bitfields )
*/
unsigned int endpoint : 1 ; /*!< 0: client, 1: server */
unsigned int transport : 1 ; /*!< stream (TLS) or datagram (DTLS) */
unsigned int authmode : 2 ; /*!< MBEDTLS_SSL_VERIFY_XXX */
/* needed even with renego disabled for LEGACY_BREAK_HANDSHAKE */
unsigned int allow_legacy_renegotiation : 2 ; /*!< MBEDTLS_LEGACY_XXX */
# if defined(MBEDTLS_ARC4_C)
unsigned int arc4_disabled : 1 ; /*!< blacklist RC4 ciphersuites? */
# endif
# if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
unsigned int mfl_code : 3 ; /*!< desired fragment length */
# endif
# if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
unsigned int encrypt_then_mac : 1 ; /*!< negotiate encrypt-then-mac? */
# endif
# if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
unsigned int extended_ms : 1 ; /*!< negotiate extended master secret? */
# endif
# if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
unsigned int anti_replay : 1 ; /*!< detect and prevent replay? */
# endif
# if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
unsigned int cbc_record_splitting : 1 ; /*!< do cbc record splitting */
# endif
# if defined(MBEDTLS_SSL_RENEGOTIATION)
unsigned int disable_renegotiation : 1 ; /*!< disable renegotiation? */
# endif
# if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
unsigned int trunc_hmac : 1 ; /*!< negotiate truncated hmac? */
# endif
# if defined(MBEDTLS_SSL_SESSION_TICKETS)
unsigned int session_tickets : 1 ; /*!< use session tickets? */
# endif
# if defined(MBEDTLS_SSL_FALLBACK_SCSV) && defined(MBEDTLS_SSL_CLI_C)
unsigned int fallback : 1 ; /*!< is this a fallback? */
# endif
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# if defined(MBEDTLS_SSL_SRV_C)
unsigned int cert_req_ca_list : 1 ; /*!< enable sending CA list in
Certificate Request messages ? */
# endif
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} ;
struct mbedtls_ssl_context
{
const mbedtls_ssl_config * conf ; /*!< configuration information */
/*
* Miscellaneous
*/
int state ; /*!< SSL handshake: current state */
# if defined(MBEDTLS_SSL_RENEGOTIATION)
int renego_status ; /*!< Initial, in progress, pending? */
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 MBEDTLS_SSL_MAJOR_VERSION_3 */
int minor_ver ; /*!< either 0 (SSL3) or 1 (TLS1.0) */
# if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT)
unsigned badmac_seen ; /*!< records with a bad MAC received */
# endif
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mbedtls_ssl_send_t * f_send ; /*!< Callback for network send */
mbedtls_ssl_recv_t * f_recv ; /*!< Callback for network receive */
mbedtls_ssl_recv_timeout_t * f_recv_timeout ;
/*!< Callback for network receive with timeout */
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void * p_bio ; /*!< context for I/O operations */
/*
* Session layer
*/
mbedtls_ssl_session * session_in ; /*!< current session data (in) */
mbedtls_ssl_session * session_out ; /*!< current session data (out) */
mbedtls_ssl_session * session ; /*!< negotiated session data */
mbedtls_ssl_session * session_negotiate ; /*!< session data in negotiation */
mbedtls_ssl_handshake_params * handshake ; /*!< params required only during
the handshake process */
/*
* Record layer transformations
*/
mbedtls_ssl_transform * transform_in ; /*!< current transform params (in) */
mbedtls_ssl_transform * transform_out ; /*!< current transform params (in) */
mbedtls_ssl_transform * transform ; /*!< negotiated transform params */
mbedtls_ssl_transform * transform_negotiate ; /*!< transform params in negotiation */
/*
* Timers
*/
void * p_timer ; /*!< context for the timer callbacks */
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mbedtls_ssl_set_timer_t * f_set_timer ; /*!< set timer callback */
mbedtls_ssl_get_timer_t * f_get_timer ; /*!< get timer callback */
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/*
* 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(MBEDTLS_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(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
uint64_t in_window_top ; /*!< last validated record seq_num */
uint64_t in_window ; /*!< bitmask for replay detection */
# endif
size_t in_hslen ; /*!< current handshake message length,
including the handshake header */
int nb_zero ; /*!< # of 0-length encrypted messages */
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int keep_current_message ; /*!< drop or reuse current message
on next call to record layer ? */
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/*
* 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(MBEDTLS_ZLIB_SUPPORT)
unsigned char * compress_buf ; /*!< zlib data buffer */
# endif
# if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
signed char split_done ; /*!< current record already splitted? */
# endif
/*
* PKI layer
*/
int client_auth ; /*!< flag for client auth. */
/*
* User settings
*/
# if defined(MBEDTLS_X509_CRT_PARSE_C)
char * hostname ; /*!< expected peer CN for verification
( and SNI if available ) */
# endif
# if defined(MBEDTLS_SSL_ALPN)
const char * alpn_chosen ; /*!< negotiated protocol */
# endif
/*
* Information for DTLS hello verify
*/
# if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
unsigned char * cli_id ; /*!< transport-level ID of the client */
size_t cli_id_len ; /*!< length of cli_id */
# endif
/*
* Secure renegotiation
*/
/* needed to know when to send extension on server */
int secure_renegotiation ; /*!< does peer support legacy or
secure renegotiation */
# if defined(MBEDTLS_SSL_RENEGOTIATION)
size_t verify_data_len ; /*!< length of verify data stored */
char own_verify_data [ MBEDTLS_SSL_VERIFY_DATA_MAX_LEN ] ; /*!< previous handshake verify data */
char peer_verify_data [ MBEDTLS_SSL_VERIFY_DATA_MAX_LEN ] ; /*!< previous handshake verify data */
# endif
} ;
# if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
# define MBEDTLS_SSL_CHANNEL_OUTBOUND 0
# define MBEDTLS_SSL_CHANNEL_INBOUND 1
extern int ( * mbedtls_ssl_hw_record_init ) ( mbedtls_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 ( * mbedtls_ssl_hw_record_activate ) ( mbedtls_ssl_context * ssl , int direction ) ;
extern int ( * mbedtls_ssl_hw_record_reset ) ( mbedtls_ssl_context * ssl ) ;
extern int ( * mbedtls_ssl_hw_record_write ) ( mbedtls_ssl_context * ssl ) ;
extern int ( * mbedtls_ssl_hw_record_read ) ( mbedtls_ssl_context * ssl ) ;
extern int ( * mbedtls_ssl_hw_record_finish ) ( mbedtls_ssl_context * ssl ) ;
# endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */
/**
* \ 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 * mbedtls_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 mbedtls_ssl_get_ciphersuite_id ( const char * ciphersuite_name ) ;
/**
* \ brief Initialize an SSL context
* Just makes the context ready for mbedtls_ssl_setup ( ) or
* mbedtls_ssl_free ( )
*
* \ param ssl SSL context
*/
void mbedtls_ssl_init ( mbedtls_ssl_context * ssl ) ;
/**
* \ brief Set up an SSL context for use
*
* \ note No copy of the configuration context is made , it can be
* shared by many mbedtls_ssl_context structures .
*
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* \ warning The conf structure will be accessed during the session .
* It must not be modified or freed as long as the session
* is active .
*
* \ warning This function must be called exactly once per context .
* Calling mbedtls_ssl_setup again is not supported , even
* if no session is active .
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*
* \ param ssl SSL context
* \ param conf SSL configuration to use
*
* \ return 0 if successful , or MBEDTLS_ERR_SSL_ALLOC_FAILED if
* memory allocation failed
*/
int mbedtls_ssl_setup ( mbedtls_ssl_context * ssl ,
const mbedtls_ssl_config * conf ) ;
/**
* \ brief Reset an already initialized SSL context for re - use
* while retaining application - set variables , function
* pointers and data .
*
* \ param ssl SSL context
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* \ return 0 if successful , or MBEDTLS_ERR_SSL_ALLOC_FAILED ,
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MBEDTLS_ERR_SSL_HW_ACCEL_FAILED or
* MBEDTLS_ERR_SSL_COMPRESSION_FAILED
*/
int mbedtls_ssl_session_reset ( mbedtls_ssl_context * ssl ) ;
/**
* \ brief Set the current endpoint type
*
* \ param conf SSL configuration
* \ param endpoint must be MBEDTLS_SSL_IS_CLIENT or MBEDTLS_SSL_IS_SERVER
*/
void mbedtls_ssl_conf_endpoint ( mbedtls_ssl_config * conf , int endpoint ) ;
/**
* \ brief Set the transport type ( TLS or DTLS ) .
* Default : TLS
*
* \ note For DTLS , you must either provide a recv callback that
* doesn ' t block , or one that handles timeouts , see
* \ c mbedtls_ssl_set_bio ( ) . You also need to provide timer
* callbacks with \ c mbedtls_ssl_set_timer_cb ( ) .
*
* \ param conf SSL configuration
* \ param transport transport type :
* MBEDTLS_SSL_TRANSPORT_STREAM for TLS ,
* MBEDTLS_SSL_TRANSPORT_DATAGRAM for DTLS .
*/
void mbedtls_ssl_conf_transport ( mbedtls_ssl_config * conf , int transport ) ;
/**
* \ brief Set the certificate verification mode
* Default : NONE on server , REQUIRED on client
*
* \ param conf SSL configuration
* \ param authmode can be :
*
* MBEDTLS_SSL_VERIFY_NONE : peer certificate is not checked
* ( default on server )
* ( insecure on client )
*
* MBEDTLS_SSL_VERIFY_OPTIONAL : peer certificate is checked , however the
* handshake continues even if verification failed ;
* mbedtls_ssl_get_verify_result ( ) can be called after the
* handshake is complete .
*
* MBEDTLS_SSL_VERIFY_REQUIRED : peer * must * present a valid certificate ,
* handshake is aborted if verification failed .
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* ( default on client )
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*
* \ note On client , MBEDTLS_SSL_VERIFY_REQUIRED is the recommended mode .
* With MBEDTLS_SSL_VERIFY_OPTIONAL , the user needs to call mbedtls_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 mbedtls_ssl_conf_authmode ( mbedtls_ssl_config * conf , int authmode ) ;
# if defined(MBEDTLS_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
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* information , please see \ c mbedtls_x509_crt_verify ( )
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*
* \ param conf SSL configuration
* \ param f_vrfy verification function
* \ param p_vrfy verification parameter
*/
void mbedtls_ssl_conf_verify ( mbedtls_ssl_config * conf ,
int ( * f_vrfy ) ( void * , mbedtls_x509_crt * , int , uint32_t * ) ,
void * p_vrfy ) ;
# endif /* MBEDTLS_X509_CRT_PARSE_C */
/**
* \ brief Set the random number generator callback
*
* \ param conf SSL configuration
* \ param f_rng RNG function
* \ param p_rng RNG parameter
*/
void mbedtls_ssl_conf_rng ( mbedtls_ssl_config * conf ,
int ( * f_rng ) ( void * , unsigned char * , size_t ) ,
void * p_rng ) ;
/**
* \ brief Set the debug callback
*
* The callback has the following argument :
* void * opaque context for the callback
* int debug level
* const char * file name
* int line number
* const char * message
*
* \ param conf SSL configuration
* \ param f_dbg debug function
* \ param p_dbg debug parameter
*/
void mbedtls_ssl_conf_dbg ( mbedtls_ssl_config * conf ,
void ( * f_dbg ) ( void * , int , const char * , int , const char * ) ,
void * p_dbg ) ;
/**
* \ 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 blocking read callback with timeout .
*
* \ note One of f_recv or f_recv_timeout can be NULL , in which case
* the other is used . If both are non - NULL , f_recv_timeout is
* used and f_recv is ignored ( as if it were NULL ) .
*
* \ note The two most common use cases are :
* - non - blocking I / O , f_recv ! = NULL , f_recv_timeout = = NULL
* - blocking I / O , f_recv = = NULL , f_recv_timout ! = NULL
*
* \ note For DTLS , you need to provide either a non - NULL
* f_recv_timeout callback , or a f_recv that doesn ' t block .
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*
* \ note See the documentations of \ c mbedtls_ssl_sent_t ,
* \ c mbedtls_ssl_recv_t and \ c mbedtls_ssl_recv_timeout_t for
* the conventions those callbacks must follow .
*
* \ note On some platforms , net_sockets . c provides
* \ c mbedtls_net_send ( ) , \ c mbedtls_net_recv ( ) and
* \ c mbedtls_net_recv_timeout ( ) that are suitable to be used
* here .
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*/
void mbedtls_ssl_set_bio ( mbedtls_ssl_context * ssl ,
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void * p_bio ,
mbedtls_ssl_send_t * f_send ,
mbedtls_ssl_recv_t * f_recv ,
mbedtls_ssl_recv_timeout_t * f_recv_timeout ) ;
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/**
* \ brief Set the timeout period for mbedtls_ssl_read ( )
* ( Default : no timeout . )
*
* \ param conf SSL configuration context
* \ param timeout Timeout value in milliseconds .
* Use 0 for no timeout ( default ) .
*
* \ note With blocking I / O , this will only work if a non - NULL
* \ c f_recv_timeout was set with \ c mbedtls_ssl_set_bio ( ) .
* With non - blocking I / O , this will only work if timer
* callbacks were set with \ c mbedtls_ssl_set_timer_cb ( ) .
*
* \ note With non - blocking I / O , you may also skip this function
* altogether and handle timeouts at the application layer .
*/
void mbedtls_ssl_conf_read_timeout ( mbedtls_ssl_config * conf , uint32_t timeout ) ;
/**
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* \ brief Set the timer callbacks ( Mandatory for DTLS . )
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*
* \ param ssl SSL context
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* \ param p_timer parameter ( context ) shared by timer callbacks
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* \ param f_set_timer set timer callback
* \ param f_get_timer get timer callback . Must return :
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*
* \ note See the documentation of \ c mbedtls_ssl_set_timer_t and
* \ c mbedtls_ssl_get_timer_t for the conventions this pair of
* callbacks must follow .
*
* \ note On some platforms , timing . c provides
* \ c mbedtls_timing_set_delay ( ) and
* \ c mbedtls_timing_get_delay ( ) that are suitable for using
* here , except if using an event - driven style .
*
* \ note See also the " DTLS tutorial " article in our knowledge base .
* https : //tls.mbed.org/kb/how-to/dtls-tutorial
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*/
void mbedtls_ssl_set_timer_cb ( mbedtls_ssl_context * ssl ,
void * p_timer ,
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mbedtls_ssl_set_timer_t * f_set_timer ,
mbedtls_ssl_get_timer_t * f_get_timer ) ;
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/**
* \ brief Callback type : generate and write session ticket
*
* \ note This describes what a callback implementation should do .
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* This callback should generate an encrypted and
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* authenticated ticket for the session and write it to the
* output buffer . Here , ticket means the opaque ticket part
* of the NewSessionTicket structure of RFC 5077.
*
* \ param p_ticket Context for the callback
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* \ param session SSL session to be written in the ticket
* \ param start Start of the output buffer
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* \ param end End of the output buffer
* \ param tlen On exit , holds the length written
* \ param lifetime On exit , holds the lifetime of the ticket in seconds
*
* \ return 0 if successful , or
* a specific MBEDTLS_ERR_XXX code .
*/
typedef int mbedtls_ssl_ticket_write_t ( void * p_ticket ,
const mbedtls_ssl_session * session ,
unsigned char * start ,
const unsigned char * end ,
size_t * tlen ,
uint32_t * lifetime ) ;
# if defined(MBEDTLS_SSL_EXPORT_KEYS)
/**
* \ brief Callback type : Export key block and master secret
*
* \ note This is required for certain uses of TLS , e . g . EAP - TLS
* ( RFC 5216 ) and Thread . The key pointers are ephemeral and
* therefore must not be stored . The master secret and keys
* should not be used directly except as an input to a key
* derivation function .
*
* \ param p_expkey Context for the callback
* \ param ms Pointer to master secret ( fixed length : 48 bytes )
* \ param kb Pointer to key block , see RFC 5246 section 6.3
* ( variable length : 2 * maclen + 2 * keylen + 2 * ivlen ) .
* \ param maclen MAC length
* \ param keylen Key length
* \ param ivlen IV length
*
* \ return 0 if successful , or
* a specific MBEDTLS_ERR_XXX code .
*/
typedef int mbedtls_ssl_export_keys_t ( void * p_expkey ,
const unsigned char * ms ,
const unsigned char * kb ,
size_t maclen ,
size_t keylen ,
size_t ivlen ) ;
# endif /* MBEDTLS_SSL_EXPORT_KEYS */
/**
* \ brief Callback type : parse and load session ticket
*
* \ note This describes what a callback implementation should do .
* This callback should parse a session ticket as generated
* by the corresponding mbedtls_ssl_ticket_write_t function ,
* and , if the ticket is authentic and valid , load the
* session .
*
* \ note The implementation is allowed to modify the first len
* bytes of the input buffer , eg to use it as a temporary
* area for the decrypted ticket contents .
*
* \ param p_ticket Context for the callback
* \ param session SSL session to be loaded
* \ param buf Start of the buffer containing the ticket
* \ param len Length of the ticket .
*
* \ return 0 if successful , or
* MBEDTLS_ERR_SSL_INVALID_MAC if not authentic , or
* MBEDTLS_ERR_SSL_SESSION_TICKET_EXPIRED if expired , or
* any other non - zero code for other failures .
*/
typedef int mbedtls_ssl_ticket_parse_t ( void * p_ticket ,
mbedtls_ssl_session * session ,
unsigned char * buf ,
size_t len ) ;
# if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_SRV_C)
/**
* \ brief Configure SSL session ticket callbacks ( server only ) .
* ( Default : none . )
*
* \ note On server , session tickets are enabled by providing
* non - NULL callbacks .
*
* \ note On client , use \ c mbedtls_ssl_conf_session_tickets ( ) .
*
* \ param conf SSL configuration context
* \ param f_ticket_write Callback for writing a ticket
* \ param f_ticket_parse Callback for parsing a ticket
* \ param p_ticket Context shared by the two callbacks
*/
void mbedtls_ssl_conf_session_tickets_cb ( mbedtls_ssl_config * conf ,
mbedtls_ssl_ticket_write_t * f_ticket_write ,
mbedtls_ssl_ticket_parse_t * f_ticket_parse ,
void * p_ticket ) ;
# endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_SRV_C */
# if defined(MBEDTLS_SSL_EXPORT_KEYS)
/**
* \ brief Configure key export callback .
* ( Default : none . )
*
* \ note See \ c mbedtls_ssl_export_keys_t .
*
* \ param conf SSL configuration context
* \ param f_export_keys Callback for exporting keys
* \ param p_export_keys Context for the callback
*/
void mbedtls_ssl_conf_export_keys_cb ( mbedtls_ssl_config * conf ,
mbedtls_ssl_export_keys_t * f_export_keys ,
void * p_export_keys ) ;
# endif /* MBEDTLS_SSL_EXPORT_KEYS */
/**
* \ 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 mbedtls_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 mbedtls_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 mbedtls_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 mbedtls_ssl_cookie_check_t ( void * ctx ,
const unsigned char * cookie , size_t clen ,
const unsigned char * info , size_t ilen ) ;
# if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
/**
* \ brief Register callbacks for DTLS cookies
* ( Server only . DTLS only . )
*
* Default : dummy callbacks that fail , in order 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 .
*
* \ note See comments on \ c mbedtls_ssl_handshake ( ) about handling
* the MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED that is expected
* on the first handshake attempt when this is enabled .
*
* \ note This is also necessary to handle client reconnection from
* the same port as described in RFC 6347 section 4.2 .8 ( only
* the variant with cookies is supported currently ) . See
* comments on \ c mbedtls_ssl_read ( ) for details .
*
* \ param conf SSL configuration
* \ param f_cookie_write Cookie write callback
* \ param f_cookie_check Cookie check callback
* \ param p_cookie Context for both callbacks
*/
void mbedtls_ssl_conf_dtls_cookies ( mbedtls_ssl_config * conf ,
mbedtls_ssl_cookie_write_t * f_cookie_write ,
mbedtls_ssl_cookie_check_t * f_cookie_check ,
void * p_cookie ) ;
/**
* \ 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 ,
* MBEDTLS_ERR_SSL_BAD_INPUT_DATA if used on client ,
* MBEDTLS_ERR_SSL_ALLOC_FAILED if out of memory .
*/
int mbedtls_ssl_set_client_transport_id ( mbedtls_ssl_context * ssl ,
const unsigned char * info ,
size_t ilen ) ;
# endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY && MBEDTLS_SSL_SRV_C */
# if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
/**
* \ brief Enable or disable anti - replay protection for DTLS .
* ( DTLS only , no effect on TLS . )
* Default : enabled .
*
* \ param conf SSL configuration
* \ param mode MBEDTLS_SSL_ANTI_REPLAY_ENABLED or MBEDTLS_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 mbedtls_ssl_conf_dtls_anti_replay ( mbedtls_ssl_config * conf , char mode ) ;
# endif /* MBEDTLS_SSL_DTLS_ANTI_REPLAY */
# if defined(MBEDTLS_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 conf SSL configuration
* \ 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 mbedtls_ssl_conf_dtls_badmac_limit ( mbedtls_ssl_config * conf , unsigned limit ) ;
# endif /* MBEDTLS_SSL_DTLS_BADMAC_LIMIT */
# if defined(MBEDTLS_SSL_PROTO_DTLS)
/**
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* \ brief Set retransmit timeout values for the DTLS handshake .
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* ( DTLS only , no effect on TLS . )
*
* \ param conf SSL configuration
* \ 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 .
*
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* \ note The ' min ' value should typically be slightly above the
* expected round - trip time to your peer , plus whatever time
* it takes for the peer to process the message . For example ,
* if your RTT is about 600 ms and you peer needs up to 1 s to
* do the cryptographic operations in the handshake , then you
* should set ' min ' slightly above 1600. Lower values of ' min '
* might cause spurious resends which waste network resources ,
* while larger value of ' min ' will increase overall latency
* on unreliable network links .
*
* \ note The more unreliable your network connection is , the larger
* your max / min ratio needs to be in order to achieve
* reliable handshakes .
*
* \ note Messages are retransmitted up to log2 ( ceil ( max / min ) ) times .
* For example , if min = 1 s and max = 5 s , the retransmit plan
* goes : send . . . 1 s - > resend . . . 2 s - > resend . . . 4 s - >
* resend . . . 5 s - > give up and return a timeout error .
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*/
void mbedtls_ssl_conf_handshake_timeout ( mbedtls_ssl_config * conf , uint32_t min , uint32_t max ) ;
# endif /* MBEDTLS_SSL_PROTO_DTLS */
# if defined(MBEDTLS_SSL_SRV_C)
/**
* \ 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 , mbedtls_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 mbedtls_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 mbedtls_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 conf SSL configuration
* \ param p_cache parmater ( context ) for both callbacks
* \ param f_get_cache session get callback
* \ param f_set_cache session set callback
*/
void mbedtls_ssl_conf_session_cache ( mbedtls_ssl_config * conf ,
void * p_cache ,
int ( * f_get_cache ) ( void * , mbedtls_ssl_session * ) ,
int ( * f_set_cache ) ( void * , const mbedtls_ssl_session * ) ) ;
# endif /* MBEDTLS_SSL_SRV_C */
# if defined(MBEDTLS_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 ,
* MBEDTLS_ERR_SSL_ALLOC_FAILED if memory allocation failed ,
* MBEDTLS_ERR_SSL_BAD_INPUT_DATA if used server - side or
* arguments are otherwise invalid
*
* \ sa mbedtls_ssl_get_session ( )
*/
int mbedtls_ssl_set_session ( mbedtls_ssl_context * ssl , const mbedtls_ssl_session * session ) ;
# endif /* MBEDTLS_SSL_CLI_C */
/**
* \ brief Set the list of allowed ciphersuites and the preference
* order . First in the list has the highest preference .
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* ( Overrides all version - specific lists )
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*
* The ciphersuites array is not copied , and must remain
* valid for the lifetime of the ssl_config .
*
* Note : The server uses its own preferences
* over the preference of the client unless
* MBEDTLS_SSL_SRV_RESPECT_CLIENT_PREFERENCE is defined !
*
* \ param conf SSL configuration
* \ param ciphersuites 0 - terminated list of allowed ciphersuites
*/
void mbedtls_ssl_conf_ciphersuites ( mbedtls_ssl_config * conf ,
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 )
*
* The ciphersuites array is not copied , and must remain
* valid for the lifetime of the ssl_config .
*
* \ param conf SSL configuration
* \ param ciphersuites 0 - terminated list of allowed ciphersuites
* \ param major Major version number ( only MBEDTLS_SSL_MAJOR_VERSION_3
* supported )
* \ param minor Minor version number ( MBEDTLS_SSL_MINOR_VERSION_0 ,
* MBEDTLS_SSL_MINOR_VERSION_1 and MBEDTLS_SSL_MINOR_VERSION_2 ,
* MBEDTLS_SSL_MINOR_VERSION_3 supported )
*
* \ note With DTLS , use MBEDTLS_SSL_MINOR_VERSION_2 for DTLS 1.0
* and MBEDTLS_SSL_MINOR_VERSION_3 for DTLS 1.2
*/
void mbedtls_ssl_conf_ciphersuites_for_version ( mbedtls_ssl_config * conf ,
const int * ciphersuites ,
int major , int minor ) ;
# if defined(MBEDTLS_X509_CRT_PARSE_C)
/**
* \ brief Set the X .509 security profile used for verification
*
* \ note The restrictions are enforced for all certificates in the
* chain . However , signatures in the handshake are not covered
* by this setting but by \ b mbedtls_ssl_conf_sig_hashes ( ) .
*
* \ param conf SSL configuration
* \ param profile Profile to use
*/
void mbedtls_ssl_conf_cert_profile ( mbedtls_ssl_config * conf ,
const mbedtls_x509_crt_profile * profile ) ;
/**
* \ brief Set the data required to verify peer certificate
*
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* \ note See \ c mbedtls_x509_crt_verify ( ) for notes regarding the
* parameters ca_chain ( maps to trust_ca for that function )
* and ca_crl .
*
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* \ param conf SSL configuration
* \ param ca_chain trusted CA chain ( meaning all fully trusted top - level CAs )
* \ param ca_crl trusted CA CRLs
*/
void mbedtls_ssl_conf_ca_chain ( mbedtls_ssl_config * conf ,
mbedtls_x509_crt * ca_chain ,
mbedtls_x509_crl * ca_crl ) ;
/**
* \ 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 On server , this function can be called multiple times to
* provision more than one cert / key pair ( eg one ECDSA , one
* RSA with SHA - 256 , one RSA with SHA - 1 ) . An adequate
* certificate will be selected according to the client ' s
* advertised capabilities . In case mutliple certificates are
* adequate , preference is given to the one set by the first
* call to this function , then second , etc .
*
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* \ note On client , only the first call has any effect . That is ,
* only one client certificate can be provisioned . The
* server ' s preferences in its CertficateRequest message will
* be ignored and our only cert will be sent regardless of
* whether it matches those preferences - the server can then
* decide what it wants to do with it .
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*
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* \ note The provided \ p pk_key needs to match the public key in the
* first certificate in \ p own_cert , or all handshakes using
* that certificate will fail . It is your responsibility
* to ensure that ; this function will not perform any check .
* You may use mbedtls_pk_check_pair ( ) in order to perform
* this check yourself , but be aware that this function can
* be computationally expensive on some key types .
*
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* \ param conf SSL configuration
* \ param own_cert own public certificate chain
* \ param pk_key own private key
*
* \ return 0 on success or MBEDTLS_ERR_SSL_ALLOC_FAILED
*/
int mbedtls_ssl_conf_own_cert ( mbedtls_ssl_config * conf ,
mbedtls_x509_crt * own_cert ,
mbedtls_pk_context * pk_key ) ;
# endif /* MBEDTLS_X509_CRT_PARSE_C */
# if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
/**
* \ brief Set the Pre Shared Key ( PSK ) and the expected identity name
*
* \ note This is mainly useful for clients . Servers will usually
* want to use \ c mbedtls_ssl_conf_psk_cb ( ) instead .
*
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* \ note Currently clients can only register one pre - shared key .
* In other words , the servers ' identity hint is ignored .
* Support for setting multiple PSKs on clients and selecting
* one based on the identity hint is not a planned feature but
* feedback is welcomed .
*
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* \ param conf SSL configuration
* \ 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 MBEDTLS_ERR_SSL_ALLOC_FAILED
*/
int mbedtls_ssl_conf_psk ( mbedtls_ssl_config * conf ,
const unsigned char * psk , size_t psk_len ,
const unsigned char * psk_identity , size_t psk_identity_len ) ;
/**
* \ brief Set the Pre Shared Key ( PSK ) for the current handshake
*
* \ note This should only be called inside the PSK callback ,
* ie the function passed to \ c mbedtls_ssl_conf_psk_cb ( ) .
*
* \ param ssl SSL context
* \ param psk pointer to the pre - shared key
* \ param psk_len pre - shared key length
*
* \ return 0 if successful or MBEDTLS_ERR_SSL_ALLOC_FAILED
*/
int mbedtls_ssl_set_hs_psk ( mbedtls_ssl_context * ssl ,
const unsigned char * psk , size_t psk_len ) ;
/**
* \ brief Set the PSK callback ( server - side only ) .
*
* 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 ,
* mbedtls_ssl_context * ssl , const unsigned char * psk_identity ,
* size_t identity_len )
* If a valid PSK identity is found , the callback should use
* \ c mbedtls_ssl_set_hs_psk ( ) on the ssl context to set the
* correct PSK and return 0.
* Any other return value will result in a denied PSK identity .
*
* \ note If you set a PSK callback using this function , then you
* don ' t need to set a PSK key and identity using
* \ c mbedtls_ssl_conf_psk ( ) .
*
* \ param conf SSL configuration
* \ param f_psk PSK identity function
* \ param p_psk PSK identity parameter
*/
void mbedtls_ssl_conf_psk_cb ( mbedtls_ssl_config * conf ,
int ( * f_psk ) ( void * , mbedtls_ssl_context * , const unsigned char * ,
size_t ) ,
void * p_psk ) ;
# endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */
# if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C)
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# if !defined(MBEDTLS_DEPRECATED_REMOVED)
# if defined(MBEDTLS_DEPRECATED_WARNING)
# define MBEDTLS_DEPRECATED __attribute__((deprecated))
# else
# define MBEDTLS_DEPRECATED
# endif
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/**
* \ brief Set the Diffie - Hellman public P and G values ,
* read as hexadecimal strings ( server - side only )
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* ( Default values : MBEDTLS_DHM_RFC3526_MODP_2048_ [ PG ] )
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*
* \ param conf SSL configuration
* \ param dhm_P Diffie - Hellman - Merkle modulus
* \ param dhm_G Diffie - Hellman - Merkle generator
*
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* \ deprecated Superseded by \ c mbedtls_ssl_conf_dh_param_bin .
*
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* \ return 0 if successful
*/
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MBEDTLS_DEPRECATED int mbedtls_ssl_conf_dh_param ( mbedtls_ssl_config * conf ,
const char * dhm_P ,
const char * dhm_G ) ;
# endif /* MBEDTLS_DEPRECATED_REMOVED */
/**
* \ brief Set the Diffie - Hellman public P and G values
* from big - endian binary presentations .
* ( Default values : MBEDTLS_DHM_RFC3526_MODP_2048_ [ PG ] _BIN )
*
* \ param conf SSL configuration
* \ param dhm_P Diffie - Hellman - Merkle modulus in big - endian binary form
* \ param P_len Length of DHM modulus
* \ param dhm_G Diffie - Hellman - Merkle generator in big - endian binary form
* \ param G_len Length of DHM generator
*
* \ return 0 if successful
*/
int mbedtls_ssl_conf_dh_param_bin ( mbedtls_ssl_config * conf ,
const unsigned char * dhm_P , size_t P_len ,
const unsigned char * dhm_G , size_t G_len ) ;
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/**
* \ brief Set the Diffie - Hellman public P and G values ,
* read from existing context ( server - side only )
*
* \ param conf SSL configuration
* \ param dhm_ctx Diffie - Hellman - Merkle context
*
* \ return 0 if successful
*/
int mbedtls_ssl_conf_dh_param_ctx ( mbedtls_ssl_config * conf , mbedtls_dhm_context * dhm_ctx ) ;
# endif /* MBEDTLS_DHM_C && defined(MBEDTLS_SSL_SRV_C) */
# if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C)
/**
* \ brief Set the minimum length for Diffie - Hellman parameters .
* ( Client - side only . )
* ( Default : 1024 bits . )
*
* \ param conf SSL configuration
* \ param bitlen Minimum bit length of the DHM prime
*/
void mbedtls_ssl_conf_dhm_min_bitlen ( mbedtls_ssl_config * conf ,
unsigned int bitlen ) ;
# endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_CLI_C */
# if defined(MBEDTLS_ECP_C)
/**
* \ 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 accepted for use in
* ECDHE and in the peer ' s end - entity certificate .
*
* \ note This has no influence on which curves are allowed inside the
* certificate chains , see \ c mbedtls_ssl_conf_cert_profile ( )
* for that . For the end - entity certificate however , the key
* will be accepted only if it is allowed both by this list
* and by the cert profile .
*
* \ note This list should be ordered by decreasing preference
* ( preferred curve first ) .
*
* \ param conf SSL configuration
* \ param curves Ordered list of allowed curves ,
* terminated by MBEDTLS_ECP_DP_NONE .
*/
void mbedtls_ssl_conf_curves ( mbedtls_ssl_config * conf ,
const mbedtls_ecp_group_id * curves ) ;
# endif /* MBEDTLS_ECP_C */
# if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
/**
* \ brief Set the allowed hashes for signatures during the handshake .
* ( Default : all available hashes except MD5 . )
*
* \ note This only affects which hashes are offered and can be used
* for signatures during the handshake . Hashes for message
* authentication and the TLS PRF are controlled by the
* ciphersuite , see \ c mbedtls_ssl_conf_ciphersuites ( ) . Hashes
* used for certificate signature are controlled by the
* verification profile , see \ c mbedtls_ssl_conf_cert_profile ( ) .
*
* \ note This list should be ordered by decreasing preference
* ( preferred hash first ) .
*
* \ param conf SSL configuration
* \ param hashes Ordered list of allowed signature hashes ,
* terminated by \ c MBEDTLS_MD_NONE .
*/
void mbedtls_ssl_conf_sig_hashes ( mbedtls_ssl_config * conf ,
const int * hashes ) ;
# endif /* MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
# if defined(MBEDTLS_X509_CRT_PARSE_C)
/**
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* \ brief Set or reset the hostname to check against the received
* server certificate . It sets the ServerName TLS extension ,
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* too , if that extension is enabled . ( client - side only )
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*
* \ param ssl SSL context
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* \ param hostname the server hostname , may be NULL to clear hostname
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*
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* \ note Maximum hostname length MBEDTLS_SSL_MAX_HOST_NAME_LEN .
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*
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* \ return 0 if successful , MBEDTLS_ERR_SSL_ALLOC_FAILED on
* allocation failure , MBEDTLS_ERR_SSL_BAD_INPUT_DATA on
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* too long input hostname .
*
* Hostname set to the one provided on success ( cleared
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* when NULL ) . On allocation failure hostname is cleared .
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* On too long input failure , old hostname is unchanged .
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*/
int mbedtls_ssl_set_hostname ( mbedtls_ssl_context * ssl , const char * hostname ) ;
# endif /* MBEDTLS_X509_CRT_PARSE_C */
# if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
/**
* \ brief Set own certificate and key for the current handshake
*
* \ note Same as \ c mbedtls_ssl_conf_own_cert ( ) but for use within
* the SNI callback .
*
* \ param ssl SSL context
* \ param own_cert own public certificate chain
* \ param pk_key own private key
*
* \ return 0 on success or MBEDTLS_ERR_SSL_ALLOC_FAILED
*/
int mbedtls_ssl_set_hs_own_cert ( mbedtls_ssl_context * ssl ,
mbedtls_x509_crt * own_cert ,
mbedtls_pk_context * pk_key ) ;
/**
* \ brief Set the data required to verify peer certificate for the
* current handshake
*
* \ note Same as \ c mbedtls_ssl_conf_ca_chain ( ) but for use within
* the SNI callback .
*
* \ param ssl SSL context
* \ param ca_chain trusted CA chain ( meaning all fully trusted top - level CAs )
* \ param ca_crl trusted CA CRLs
*/
void mbedtls_ssl_set_hs_ca_chain ( mbedtls_ssl_context * ssl ,
mbedtls_x509_crt * ca_chain ,
mbedtls_x509_crl * ca_crl ) ;
/**
* \ brief Set authmode for the current handshake .
*
* \ note Same as \ c mbedtls_ssl_conf_authmode ( ) but for use within
* the SNI callback .
*
* \ param ssl SSL context
* \ param authmode MBEDTLS_SSL_VERIFY_NONE , MBEDTLS_SSL_VERIFY_OPTIONAL or
* MBEDTLS_SSL_VERIFY_REQUIRED
*/
void mbedtls_ssl_set_hs_authmode ( mbedtls_ssl_context * ssl ,
int authmode ) ;
/**
* \ 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 , mbedtls_ssl_context * ssl ,
* const unsigned char * hostname , size_t len ) . If a suitable
* certificate is found , the callback must set the
* certificate ( s ) and key ( s ) to use with \ c
* mbedtls_ssl_set_hs_own_cert ( ) ( can be called repeatedly ) ,
* and may optionally adjust the CA and associated CRL with \ c
* mbedtls_ssl_set_hs_ca_chain ( ) as well as the client
* authentication mode with \ c mbedtls_ssl_set_hs_authmode ( ) ,
* then must return 0. If no matching name is found , the
* callback must either set a default cert , or
* return non - zero to abort the handshake at this point .
*
* \ param conf SSL configuration
* \ param f_sni verification function
* \ param p_sni verification parameter
*/
void mbedtls_ssl_conf_sni ( mbedtls_ssl_config * conf ,
int ( * f_sni ) ( void * , mbedtls_ssl_context * , const unsigned char * ,
size_t ) ,
void * p_sni ) ;
# endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
# if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
/**
* \ brief Set the EC J - PAKE password for current handshake .
*
* \ note An internal copy is made , and destroyed as soon as the
* handshake is completed , or when the SSL context is reset or
* freed .
*
* \ note The SSL context needs to be already set up . The right place
* to call this function is between \ c mbedtls_ssl_setup ( ) or
* \ c mbedtls_ssl_reset ( ) and \ c mbedtls_ssl_handshake ( ) .
*
* \ param ssl SSL context
* \ param pw EC J - PAKE password ( pre - shared secret )
* \ param pw_len length of pw in bytes
*
* \ return 0 on success , or a negative error code .
*/
int mbedtls_ssl_set_hs_ecjpake_password ( mbedtls_ssl_context * ssl ,
const unsigned char * pw ,
size_t pw_len ) ;
# endif /*MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
# if defined(MBEDTLS_SSL_ALPN)
/**
* \ brief Set the supported Application Layer Protocols .
*
* \ param conf SSL configuration
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* \ param protos Pointer to a NULL - terminated list of supported protocols ,
* in decreasing preference order . The pointer to the list is
* recorded by the library for later reference as required , so
* the lifetime of the table must be atleast as long as the
* lifetime of the SSL configuration structure .
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*
* \ return 0 on success , or MBEDTLS_ERR_SSL_BAD_INPUT_DATA .
*/
int mbedtls_ssl_conf_alpn_protocols ( mbedtls_ssl_config * conf , 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 * mbedtls_ssl_get_alpn_protocol ( const mbedtls_ssl_context * ssl ) ;
# endif /* MBEDTLS_SSL_ALPN */
/**
* \ brief Set the maximum supported version sent from the client side
* and / or accepted at the server side
* ( Default : MBEDTLS_SSL_MAX_MAJOR_VERSION , MBEDTLS_SSL_MAX_MINOR_VERSION )
*
* \ note This ignores ciphersuites from higher versions .
*
* \ note With DTLS , use MBEDTLS_SSL_MINOR_VERSION_2 for DTLS 1.0 and
* MBEDTLS_SSL_MINOR_VERSION_3 for DTLS 1.2
*
* \ param conf SSL configuration
* \ param major Major version number ( only MBEDTLS_SSL_MAJOR_VERSION_3 supported )
* \ param minor Minor version number ( MBEDTLS_SSL_MINOR_VERSION_0 ,
* MBEDTLS_SSL_MINOR_VERSION_1 and MBEDTLS_SSL_MINOR_VERSION_2 ,
* MBEDTLS_SSL_MINOR_VERSION_3 supported )
*/
void mbedtls_ssl_conf_max_version ( mbedtls_ssl_config * conf , int major , int minor ) ;
/**
* \ brief Set the minimum accepted SSL / TLS protocol version
* ( Default : TLS 1.0 )
*
* \ note Input outside of the SSL_MAX_XXXXX_VERSION and
* SSL_MIN_XXXXX_VERSION range is ignored .
*
* \ note MBEDTLS_SSL_MINOR_VERSION_0 ( SSL v3 ) should be avoided .
*
* \ note With DTLS , use MBEDTLS_SSL_MINOR_VERSION_2 for DTLS 1.0 and
* MBEDTLS_SSL_MINOR_VERSION_3 for DTLS 1.2
*
* \ param conf SSL configuration
* \ param major Major version number ( only MBEDTLS_SSL_MAJOR_VERSION_3 supported )
* \ param minor Minor version number ( MBEDTLS_SSL_MINOR_VERSION_0 ,
* MBEDTLS_SSL_MINOR_VERSION_1 and MBEDTLS_SSL_MINOR_VERSION_2 ,
* MBEDTLS_SSL_MINOR_VERSION_3 supported )
*/
void mbedtls_ssl_conf_min_version ( mbedtls_ssl_config * conf , int major , int minor ) ;
# if defined(MBEDTLS_SSL_FALLBACK_SCSV) && defined(MBEDTLS_SSL_CLI_C)
/**
* \ brief Set the fallback flag ( client - side only ) .
* ( Default : MBEDTLS_SSL_IS_NOT_FALLBACK ) .
*
* \ note Set to MBEDTLS_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 MBEDTLS_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 conf SSL configuration
* \ param fallback MBEDTLS_SSL_IS_NOT_FALLBACK or MBEDTLS_SSL_IS_FALLBACK
*/
void mbedtls_ssl_conf_fallback ( mbedtls_ssl_config * conf , char fallback ) ;
# endif /* MBEDTLS_SSL_FALLBACK_SCSV && MBEDTLS_SSL_CLI_C */
# if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
/**
* \ brief Enable or disable Encrypt - then - MAC
* ( Default : MBEDTLS_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 conf SSL configuration
* \ param etm MBEDTLS_SSL_ETM_ENABLED or MBEDTLS_SSL_ETM_DISABLED
*/
void mbedtls_ssl_conf_encrypt_then_mac ( mbedtls_ssl_config * conf , char etm ) ;
# endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
# if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
/**
* \ brief Enable or disable Extended Master Secret negotiation .
* ( Default : MBEDTLS_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 conf SSL configuration
* \ param ems MBEDTLS_SSL_EXTENDED_MS_ENABLED or MBEDTLS_SSL_EXTENDED_MS_DISABLED
*/
void mbedtls_ssl_conf_extended_master_secret ( mbedtls_ssl_config * conf , char ems ) ;
# endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
# if defined(MBEDTLS_ARC4_C)
/**
* \ brief Disable or enable support for RC4
* ( Default : MBEDTLS_SSL_ARC4_DISABLED )
*
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* \ warning Use of RC4 in DTLS / TLS has been prohibited by RFC 7465
* for security reasons . Use at your own risk .
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*
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* \ note This function is deprecated and will likely be removed in
* a future version of the library .
* RC4 is disabled by default at compile time and needs to be
* actively enabled for use with legacy systems .
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*
* \ param conf SSL configuration
* \ param arc4 MBEDTLS_SSL_ARC4_ENABLED or MBEDTLS_SSL_ARC4_DISABLED
*/
void mbedtls_ssl_conf_arc4_support ( mbedtls_ssl_config * conf , char arc4 ) ;
# endif /* MBEDTLS_ARC4_C */
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# if defined(MBEDTLS_SSL_SRV_C)
/**
* \ brief Whether to send a list of acceptable CAs in
* CertificateRequest messages .
* ( Default : do send )
*
* \ param conf SSL configuration
* \ param cert_req_ca_list MBEDTLS_SSL_CERT_REQ_CA_LIST_ENABLED or
* MBEDTLS_SSL_CERT_REQ_CA_LIST_DISABLED
*/
void mbedtls_ssl_conf_cert_req_ca_list ( mbedtls_ssl_config * conf ,
char cert_req_ca_list ) ;
# endif /* MBEDTLS_SSL_SRV_C */
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# if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
/**
* \ brief Set the maximum fragment length to emit and / or negotiate
* ( Default : MBEDTLS_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 conf SSL configuration
* \ param mfl_code Code for maximum fragment length ( allowed values :
* MBEDTLS_SSL_MAX_FRAG_LEN_512 , MBEDTLS_SSL_MAX_FRAG_LEN_1024 ,
* MBEDTLS_SSL_MAX_FRAG_LEN_2048 , MBEDTLS_SSL_MAX_FRAG_LEN_4096 )
*
* \ return 0 if successful or MBEDTLS_ERR_SSL_BAD_INPUT_DATA
*/
int mbedtls_ssl_conf_max_frag_len ( mbedtls_ssl_config * conf , unsigned char mfl_code ) ;
# endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
# if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
/**
* \ brief Activate negotiation of truncated HMAC
* ( Default : MBEDTLS_SSL_TRUNC_HMAC_DISABLED )
*
* \ param conf SSL configuration
* \ param truncate Enable or disable ( MBEDTLS_SSL_TRUNC_HMAC_ENABLED or
* MBEDTLS_SSL_TRUNC_HMAC_DISABLED )
*/
void mbedtls_ssl_conf_truncated_hmac ( mbedtls_ssl_config * conf , int truncate ) ;
# endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
# if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
/**
* \ brief Enable / Disable 1 / n - 1 record splitting
* ( Default : MBEDTLS_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 conf SSL configuration
* \ param split MBEDTLS_SSL_CBC_RECORD_SPLITTING_ENABLED or
* MBEDTLS_SSL_CBC_RECORD_SPLITTING_DISABLED
*/
void mbedtls_ssl_conf_cbc_record_splitting ( mbedtls_ssl_config * conf , char split ) ;
# endif /* MBEDTLS_SSL_CBC_RECORD_SPLITTING */
# if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C)
/**
* \ brief Enable / Disable session tickets ( client only ) .
* ( Default : MBEDTLS_SSL_SESSION_TICKETS_ENABLED . )
*
* \ note On server , use \ c mbedtls_ssl_conf_session_tickets_cb ( ) .
*
* \ param conf SSL configuration
* \ param use_tickets Enable or disable ( MBEDTLS_SSL_SESSION_TICKETS_ENABLED or
* MBEDTLS_SSL_SESSION_TICKETS_DISABLED )
*/
void mbedtls_ssl_conf_session_tickets ( mbedtls_ssl_config * conf , int use_tickets ) ;
# endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */
# if defined(MBEDTLS_SSL_RENEGOTIATION)
/**
* \ brief Enable / Disable renegotiation support for connection when
* initiated by peer
* ( Default : MBEDTLS_SSL_RENEGOTIATION_DISABLED )
*
* \ warning It is recommended to always disable renegotation unless you
* know you need it and you know what you ' re doing . In the
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* past , there have been several issues associated with
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* renegotiation or a poor understanding of its properties .
*
* \ note Server - side , enabling renegotiation also makes the server
* susceptible to a resource DoS by a malicious client .
*
* \ param conf SSL configuration
* \ param renegotiation Enable or disable ( MBEDTLS_SSL_RENEGOTIATION_ENABLED or
* MBEDTLS_SSL_RENEGOTIATION_DISABLED )
*/
void mbedtls_ssl_conf_renegotiation ( mbedtls_ssl_config * conf , int renegotiation ) ;
# endif /* MBEDTLS_SSL_RENEGOTIATION */
/**
* \ brief Prevent or allow legacy renegotiation .
* ( Default : MBEDTLS_SSL_LEGACY_NO_RENEGOTIATION )
*
* MBEDTLS_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 )
*
* MBEDTLS_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 )
*
* MBEDTLS_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 conf SSL configuration
* \ param allow_legacy Prevent or allow ( SSL_NO_LEGACY_RENEGOTIATION ,
* SSL_ALLOW_LEGACY_RENEGOTIATION or
* MBEDTLS_SSL_LEGACY_BREAK_HANDSHAKE )
*/
void mbedtls_ssl_conf_legacy_renegotiation ( mbedtls_ssl_config * conf , int allow_legacy ) ;
# if defined(MBEDTLS_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 mbedtls_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
* mbedtls_ssl_read ( ) , as opposed to mbedtls_ssl_write ( ) and mbedtls_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 mbedtls_ssl_read ( ) .
*
* \ param conf SSL configuration
* \ param max_records Use MBEDTLS_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 mbedtls_ssl_conf_renegotiation_enforced ( mbedtls_ssl_config * conf , int max_records ) ;
/**
* \ brief Set record counter threshold for periodic renegotiation .
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* ( Default : 2 ^ 48 - 1 )
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*
* 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 " .
*
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* The renegotiation period can be disabled by setting
* conf - > disable_renegotiation to
* MBEDTLS_SSL_RENEGOTIATION_DISABLED .
*
* \ note When the configured transport is
* MBEDTLS_SSL_TRANSPORT_DATAGRAM the maximum renegotiation
* period is 2 ^ 48 - 1 , and for MBEDTLS_SSL_TRANSPORT_STREAM ,
* the maximum renegotiation period is 2 ^ 64 - 1.
*
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* \ param conf SSL configuration
* \ param period The threshold value : a big - endian 64 - bit number .
*/
void mbedtls_ssl_conf_renegotiation_period ( mbedtls_ssl_config * conf ,
const unsigned char period [ 8 ] ) ;
# endif /* MBEDTLS_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 mbedtls_ssl_get_bytes_avail ( const mbedtls_ssl_context * ssl ) ;
/**
* \ brief Return the result of the certificate verification
*
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* \ param ssl The SSL context to use .
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*
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* \ return \ c 0 if the certificate verification was successful .
* \ return \ c - 1u if the result is not available . This may happen
* e . g . if the handshake aborts early , or a verification
* callback returned a fatal error .
* \ return A bitwise combination of \ c MBEDTLS_X509_BADCERT_XXX
* and \ c MBEDTLS_X509_BADCRL_XXX failure flags ; see x509 . h .
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*/
uint32_t mbedtls_ssl_get_verify_result ( const mbedtls_ssl_context * ssl ) ;
/**
* \ brief Return the name of the current ciphersuite
*
* \ param ssl SSL context
*
* \ return a string containing the ciphersuite name
*/
const char * mbedtls_ssl_get_ciphersuite ( const mbedtls_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 * mbedtls_ssl_get_version ( const mbedtls_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
* MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE if compression is
* enabled , which makes expansion much less predictable
*/
int mbedtls_ssl_get_record_expansion ( const mbedtls_ssl_context * ssl ) ;
# if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
/**
* \ brief Return the maximum fragment length ( payload , in bytes ) .
* This is the value negotiated with peer if any ,
* or the locally configured value .
*
* \ note With DTLS , \ c mbedtls_ssl_write ( ) will return an error if
* called with a larger length value .
* With TLS , \ c mbedtls_ssl_write ( ) will fragment the input if
* necessary and return the number of bytes written ; it is up
* to the caller to call \ c mbedtls_ssl_write ( ) again in
* order to send the remaining bytes if any .
*
* \ param ssl SSL context
*
* \ return Current maximum fragment length .
*/
size_t mbedtls_ssl_get_max_frag_len ( const mbedtls_ssl_context * ssl ) ;
# endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
# if defined(MBEDTLS_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 mbedtls_x509_crt * mbedtls_ssl_get_peer_cert ( const mbedtls_ssl_context * ssl ) ;
# endif /* MBEDTLS_X509_CRT_PARSE_C */
# if defined(MBEDTLS_SSL_CLI_C)
/**
* \ brief Save session in order to resume it later ( client - side only )
* Session data is copied to presented session structure .
*
*
* \ param ssl SSL context
* \ param session session context
*
* \ return 0 if successful ,
* MBEDTLS_ERR_SSL_ALLOC_FAILED if memory allocation failed ,
* MBEDTLS_ERR_SSL_BAD_INPUT_DATA if used server - side or
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* arguments are otherwise invalid .
*
* \ note Only the server certificate is copied , and not the full chain ,
* so you should not attempt to validate the certificate again
* by calling \ c mbedtls_x509_crt_verify ( ) on it .
* Instead , you should use the results from the verification
* in the original handshake by calling \ c mbedtls_ssl_get_verify_result ( )
* after loading the session again into a new SSL context
* using \ c mbedtls_ssl_set_session ( ) .
*
* \ note Once the session object is not needed anymore , you should
* free it by calling \ c mbedtls_ssl_session_free ( ) .
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*
* \ sa mbedtls_ssl_set_session ( )
*/
int mbedtls_ssl_get_session ( const mbedtls_ssl_context * ssl , mbedtls_ssl_session * session ) ;
# endif /* MBEDTLS_SSL_CLI_C */
/**
* \ brief Perform the SSL handshake
*
* \ param ssl SSL context
*
* \ return 0 if successful , or
* MBEDTLS_ERR_SSL_WANT_READ or MBEDTLS_ERR_SSL_WANT_WRITE , or
* MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED ( see below ) , or
* a specific SSL error code .
*
* \ note If this function returns something other than 0 or
* MBEDTLS_ERR_SSL_WANT_READ / WRITE , then the ssl context
* becomes unusable , and you should either free it or call
* \ c mbedtls_ssl_session_reset ( ) on it before re - using it for
* a new connection ; the current connection must be closed .
*
* \ note If DTLS is in use , then you may choose to handle
* MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED specially for logging
* purposes , as it is an expected return value rather than an
* actual error , but you still need to reset / free the context .
*/
int mbedtls_ssl_handshake ( mbedtls_ssl_context * ssl ) ;
/**
* \ brief Perform a single step of the SSL handshake
*
* \ note The state of the context ( ssl - > state ) will be at
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* the next state after execution of this function . Do not
* call this function if state is MBEDTLS_SSL_HANDSHAKE_OVER .
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*
* \ note If this function returns something other than 0 or
* MBEDTLS_ERR_SSL_WANT_READ / WRITE , then the ssl context
* becomes unusable , and you should either free it or call
* \ c mbedtls_ssl_session_reset ( ) on it before re - using it for
* a new connection ; the current connection must be closed .
*
* \ param ssl SSL context
*
* \ return 0 if successful , or
* MBEDTLS_ERR_SSL_WANT_READ or MBEDTLS_ERR_SSL_WANT_WRITE , or
* a specific SSL error code .
*/
int mbedtls_ssl_handshake_step ( mbedtls_ssl_context * ssl ) ;
# if defined(MBEDTLS_SSL_RENEGOTIATION)
/**
* \ brief Initiate an SSL renegotiation on the running connection .
* Client : perform the renegotiation right now .
* Server : request renegotiation , which will be performed
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* during the next call to mbedtls_ssl_read ( ) if honored by
* client .
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*
* \ param ssl SSL context
*
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* \ return 0 if successful , or any mbedtls_ssl_handshake ( ) return
* value .
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*
* \ note If this function returns something other than 0 or
* MBEDTLS_ERR_SSL_WANT_READ / WRITE , then the ssl context
* becomes unusable , and you should either free it or call
* \ c mbedtls_ssl_session_reset ( ) on it before re - using it for
* a new connection ; the current connection must be closed .
*/
int mbedtls_ssl_renegotiate ( mbedtls_ssl_context * ssl ) ;
# endif /* MBEDTLS_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 the number of bytes read , or
* 0 for EOF , or
* MBEDTLS_ERR_SSL_WANT_READ or MBEDTLS_ERR_SSL_WANT_WRITE , or
* MBEDTLS_ERR_SSL_CLIENT_RECONNECT ( see below ) , or
* another negative error code .
*
* \ note If this function returns something other than a positive
* value or MBEDTLS_ERR_SSL_WANT_READ / WRITE or
* MBEDTLS_ERR_SSL_CLIENT_RECONNECT , then the ssl context
* becomes unusable , and you should either free it or call
* \ c mbedtls_ssl_session_reset ( ) on it before re - using it for
* a new connection ; the current connection must be closed .
*
* \ note When this function return MBEDTLS_ERR_SSL_CLIENT_RECONNECT
* ( which can only happen server - side ) , it means that a client
* is initiating a new connection using the same source port .
* You can either treat that as a connection close and wait
* for the client to resend a ClientHello , or directly
* continue with \ c mbedtls_ssl_handshake ( ) with the same
* context ( as it has beeen reset internally ) . Either way , you
* should make sure this is seen by the application as a new
* connection : application state , if any , should be reset , and
* most importantly the identity of the client must be checked
* again . WARNING : not validating the identity of the client
* again , or not transmitting the new identity to the
* application layer , would allow authentication bypass !
*/
int mbedtls_ssl_read ( mbedtls_ssl_context * ssl , unsigned char * buf , size_t len ) ;
/**
* \ brief Try to write exactly ' len ' application data bytes
*
* \ warning This function will do partial writes in some cases . If the
* return value is non - negative but less than length , the
* function must be called again with updated arguments :
* buf + ret , len - ret ( if ret is the return value ) until
* it returns a value equal to the last ' len ' argument .
*
* \ param ssl SSL context
* \ param buf buffer holding the data
* \ param len how many bytes must be written
*
* \ return the number of bytes actually written ( may be less than len ) ,
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* or MBEDTLS_ERR_SSL_WANT_WRITE or MBEDTLS_ERR_SSL_WANT_READ ,
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* or another negative error code .
*
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* \ note If this function returns something other than 0 , a positive
* value or MBEDTLS_ERR_SSL_WANT_READ / WRITE , you must stop
* using the SSL context for reading or writing , and either
* free it or call \ c mbedtls_ssl_session_reset ( ) on it before
* re - using it for a new connection ; the current connection
* must be closed .
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*
* \ note When this function returns MBEDTLS_ERR_SSL_WANT_WRITE / READ ,
* it must be called later with the * same * arguments ,
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* until it returns a value greater that or equal to 0. When
* the function returns MBEDTLS_ERR_SSL_WANT_WRITE there may be
* some partial data in the output buffer , however this is not
* yet sent .
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*
* \ 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 .
* - with DTLS , MBEDTLS_ERR_SSL_BAD_INPUT_DATA is returned .
* \ c mbedtls_ssl_get_max_frag_len ( ) may be used to query the
* active maximum fragment length .
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*
* \ note Attempting to write 0 bytes will result in an empty TLS
* application record being sent .
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*/
int mbedtls_ssl_write ( mbedtls_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
* ( MBEDTLS_SSL_ALERT_LEVEL_WARNING or MBEDTLS_SSL_ALERT_LEVEL_FATAL )
* \ param message The alert message ( SSL_ALERT_MSG_ * )
*
* \ return 0 if successful , or a specific SSL error code .
*
* \ note If this function returns something other than 0 or
* MBEDTLS_ERR_SSL_WANT_READ / WRITE , then the ssl context
* becomes unusable , and you should either free it or call
* \ c mbedtls_ssl_session_reset ( ) on it before re - using it for
* a new connection ; the current connection must be closed .
*/
int mbedtls_ssl_send_alert_message ( mbedtls_ssl_context * ssl ,
unsigned char level ,
unsigned char message ) ;
/**
* \ brief Notify the peer that the connection is being closed
*
* \ param ssl SSL context
*
* \ return 0 if successful , or a specific SSL error code .
*
* \ note If this function returns something other than 0 or
* MBEDTLS_ERR_SSL_WANT_READ / WRITE , then the ssl context
* becomes unusable , and you should either free it or call
* \ c mbedtls_ssl_session_reset ( ) on it before re - using it for
* a new connection ; the current connection must be closed .
*/
int mbedtls_ssl_close_notify ( mbedtls_ssl_context * ssl ) ;
/**
* \ brief Free referenced items in an SSL context and clear memory
*
* \ param ssl SSL context
*/
void mbedtls_ssl_free ( mbedtls_ssl_context * ssl ) ;
/**
* \ brief Initialize an SSL configuration context
* Just makes the context ready for
* mbedtls_ssl_config_defaults ( ) or mbedtls_ssl_config_free ( ) .
*
* \ note You need to call mbedtls_ssl_config_defaults ( ) unless you
* manually set all of the relevent fields yourself .
*
* \ param conf SSL configuration context
*/
void mbedtls_ssl_config_init ( mbedtls_ssl_config * conf ) ;
/**
* \ brief Load reasonnable default SSL configuration values .
* ( You need to call mbedtls_ssl_config_init ( ) first . )
*
* \ param conf SSL configuration context
* \ param endpoint MBEDTLS_SSL_IS_CLIENT or MBEDTLS_SSL_IS_SERVER
* \ param transport MBEDTLS_SSL_TRANSPORT_STREAM for TLS , or
* MBEDTLS_SSL_TRANSPORT_DATAGRAM for DTLS
* \ param preset a MBEDTLS_SSL_PRESET_XXX value
*
* \ note See \ c mbedtls_ssl_conf_transport ( ) for notes on DTLS .
*
* \ return 0 if successful , or
* MBEDTLS_ERR_XXX_ALLOC_FAILED on memory allocation error .
*/
int mbedtls_ssl_config_defaults ( mbedtls_ssl_config * conf ,
int endpoint , int transport , int preset ) ;
/**
* \ brief Free an SSL configuration context
*
* \ param conf SSL configuration context
*/
void mbedtls_ssl_config_free ( mbedtls_ssl_config * conf ) ;
/**
* \ brief Initialize SSL session structure
*
* \ param session SSL session
*/
void mbedtls_ssl_session_init ( mbedtls_ssl_session * session ) ;
/**
* \ brief Free referenced items in an SSL session including the
* peer certificate and clear memory
*
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* \ note A session object can be freed even if the SSL context
* that was used to retrieve the session is still in use .
*
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* \ param session SSL session
*/
void mbedtls_ssl_session_free ( mbedtls_ssl_session * session ) ;
# ifdef __cplusplus
}
# endif
# endif /* ssl.h */
