/** * \file ssl.h * * \brief SSL/TLS functions. * * Copyright (C) 2006-2014, ARM Limited, All Rights Reserved * * This file is part of mbed TLS (https://tls.mbed.org) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #ifndef POLARSSL_SSL_H #define POLARSSL_SSL_H #if !defined(POLARSSL_CONFIG_FILE) #include "config.h" #else #include POLARSSL_CONFIG_FILE #endif /* Temporary compatibility trick for the current stable branch */ #if !defined(POLARSSL_SSL_DISABLE_RENEGOTIATION) #define POLARSSL_SSL_RENEGOTIATION #endif #include "net.h" #include "bignum.h" #include "ecp.h" #include "ssl_ciphersuites.h" #if defined(POLARSSL_MD5_C) #include "md5.h" #endif #if defined(POLARSSL_SHA1_C) #include "sha1.h" #endif #if defined(POLARSSL_SHA256_C) #include "sha256.h" #endif #if defined(POLARSSL_SHA512_C) #include "sha512.h" #endif // for session tickets #if defined(POLARSSL_AES_C) #include "aes.h" #endif #if defined(POLARSSL_X509_CRT_PARSE_C) #include "x509_crt.h" #include "x509_crl.h" #endif #if defined(POLARSSL_DHM_C) #include "dhm.h" #endif #if defined(POLARSSL_ECDH_C) #include "ecdh.h" #endif #if defined(POLARSSL_ZLIB_SUPPORT) #include "zlib.h" #endif #if defined(POLARSSL_SSL_PROTO_DTLS) #include "timing.h" #endif #if defined(POLARSSL_HAVE_TIME) #include #endif /* For convenience below and in programs */ #if defined(POLARSSL_KEY_EXCHANGE_PSK_ENABLED) || \ defined(POLARSSL_KEY_EXCHANGE_RSA_PSK_ENABLED) || \ defined(POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED) || \ defined(POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED) #define POLARSSL_KEY_EXCHANGE__SOME__PSK_ENABLED #endif #if defined(POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \ defined(POLARSSL_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) || \ defined(POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED) #define POLARSSL_KEY_EXCHANGE__SOME__ECDHE_ENABLED #endif #if defined(_MSC_VER) && !defined(inline) #define inline _inline #else #if defined(__ARMCC_VERSION) && !defined(inline) #define inline __inline #endif /* __ARMCC_VERSION */ #endif /*_MSC_VER */ /* * SSL Error codes */ #define POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE -0x7080 /**< The requested feature is not available. */ #define POLARSSL_ERR_SSL_BAD_INPUT_DATA -0x7100 /**< Bad input parameters to function. */ #define POLARSSL_ERR_SSL_INVALID_MAC -0x7180 /**< Verification of the message MAC failed. */ #define POLARSSL_ERR_SSL_INVALID_RECORD -0x7200 /**< An invalid SSL record was received. */ #define POLARSSL_ERR_SSL_CONN_EOF -0x7280 /**< The connection indicated an EOF. */ #define POLARSSL_ERR_SSL_UNKNOWN_CIPHER -0x7300 /**< An unknown cipher was received. */ #define POLARSSL_ERR_SSL_NO_CIPHER_CHOSEN -0x7380 /**< The server has no ciphersuites in common with the client. */ #define POLARSSL_ERR_SSL_NO_RNG -0x7400 /**< No RNG was provided to the SSL module. */ #define POLARSSL_ERR_SSL_NO_CLIENT_CERTIFICATE -0x7480 /**< No client certification received from the client, but required by the authentication mode. */ #define POLARSSL_ERR_SSL_CERTIFICATE_TOO_LARGE -0x7500 /**< Our own certificate(s) is/are too large to send in an SSL message. */ #define POLARSSL_ERR_SSL_CERTIFICATE_REQUIRED -0x7580 /**< The own certificate is not set, but needed by the server. */ #define POLARSSL_ERR_SSL_PRIVATE_KEY_REQUIRED -0x7600 /**< The own private key or pre-shared key is not set, but needed. */ #define POLARSSL_ERR_SSL_CA_CHAIN_REQUIRED -0x7680 /**< No CA Chain is set, but required to operate. */ #define POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE -0x7700 /**< An unexpected message was received from our peer. */ #define POLARSSL_ERR_SSL_FATAL_ALERT_MESSAGE -0x7780 /**< A fatal alert message was received from our peer. */ #define POLARSSL_ERR_SSL_PEER_VERIFY_FAILED -0x7800 /**< Verification of our peer failed. */ #define POLARSSL_ERR_SSL_PEER_CLOSE_NOTIFY -0x7880 /**< The peer notified us that the connection is going to be closed. */ #define POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO -0x7900 /**< Processing of the ClientHello handshake message failed. */ #define POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO -0x7980 /**< Processing of the ServerHello handshake message failed. */ #define POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE -0x7A00 /**< Processing of the Certificate handshake message failed. */ #define POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST -0x7A80 /**< Processing of the CertificateRequest handshake message failed. */ #define POLARSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE -0x7B00 /**< Processing of the ServerKeyExchange handshake message failed. */ #define POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO_DONE -0x7B80 /**< Processing of the ServerHelloDone handshake message failed. */ #define POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE -0x7C00 /**< Processing of the ClientKeyExchange handshake message failed. */ #define POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_RP -0x7C80 /**< Processing of the ClientKeyExchange handshake message failed in DHM / ECDH Read Public. */ #define POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_CS -0x7D00 /**< Processing of the ClientKeyExchange handshake message failed in DHM / ECDH Calculate Secret. */ #define POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY -0x7D80 /**< Processing of the CertificateVerify handshake message failed. */ #define POLARSSL_ERR_SSL_BAD_HS_CHANGE_CIPHER_SPEC -0x7E00 /**< Processing of the ChangeCipherSpec handshake message failed. */ #define POLARSSL_ERR_SSL_BAD_HS_FINISHED -0x7E80 /**< Processing of the Finished handshake message failed. */ #define POLARSSL_ERR_SSL_MALLOC_FAILED -0x7F00 /**< Memory allocation failed */ #define POLARSSL_ERR_SSL_HW_ACCEL_FAILED -0x7F80 /**< Hardware acceleration function returned with error */ #define POLARSSL_ERR_SSL_HW_ACCEL_FALLTHROUGH -0x6F80 /**< Hardware acceleration function skipped / left alone data */ #define POLARSSL_ERR_SSL_COMPRESSION_FAILED -0x6F00 /**< Processing of the compression / decompression failed */ #define POLARSSL_ERR_SSL_BAD_HS_PROTOCOL_VERSION -0x6E80 /**< Handshake protocol not within min/max boundaries */ #define POLARSSL_ERR_SSL_BAD_HS_NEW_SESSION_TICKET -0x6E00 /**< Processing of the NewSessionTicket handshake message failed. */ #define POLARSSL_ERR_SSL_SESSION_TICKET_EXPIRED -0x6D80 /**< Session ticket has expired. */ #define POLARSSL_ERR_SSL_PK_TYPE_MISMATCH -0x6D00 /**< Public key type mismatch (eg, asked for RSA key exchange and presented EC key) */ #define POLARSSL_ERR_SSL_UNKNOWN_IDENTITY -0x6C80 /**< Unknown identity received (eg, PSK identity) */ #define POLARSSL_ERR_SSL_INTERNAL_ERROR -0x6C00 /**< Internal error (eg, unexpected failure in lower-level module) */ #define POLARSSL_ERR_SSL_COUNTER_WRAPPING -0x6B80 /**< A counter would wrap (eg, too many messages exchanged). */ #define POLARSSL_ERR_SSL_WAITING_SERVER_HELLO_RENEGO -0x6B00 /**< Unexpected message at ServerHello in renegotiation. */ #define POLARSSL_ERR_SSL_HELLO_VERIFY_REQUIRED -0x6A80 /**< DTLS client must retry for hello verification */ #define POLARSSL_ERR_SSL_BUFFER_TOO_SMALL -0x6A00 /**< A buffer is too small to receive or write a message */ #define POLARSSL_ERR_SSL_NO_USABLE_CIPHERSUITE -0x6980 /**< None of the common ciphersuites is usable (eg, no suitable certificate, see debug messages). */ /* * Various constants */ #define SSL_MAJOR_VERSION_3 3 #define SSL_MINOR_VERSION_0 0 /*!< SSL v3.0 */ #define SSL_MINOR_VERSION_1 1 /*!< TLS v1.0 */ #define SSL_MINOR_VERSION_2 2 /*!< TLS v1.1 */ #define SSL_MINOR_VERSION_3 3 /*!< TLS v1.2 */ #define SSL_TRANSPORT_STREAM 0 /*!< TLS */ #define SSL_TRANSPORT_DATAGRAM 1 /*!< DTLS */ /* Determine minimum supported version */ #define SSL_MIN_MAJOR_VERSION SSL_MAJOR_VERSION_3 #if defined(POLARSSL_SSL_PROTO_SSL3) #define SSL_MIN_MINOR_VERSION SSL_MINOR_VERSION_0 #else #if defined(POLARSSL_SSL_PROTO_TLS1) #define SSL_MIN_MINOR_VERSION SSL_MINOR_VERSION_1 #else #if defined(POLARSSL_SSL_PROTO_TLS1_1) #define SSL_MIN_MINOR_VERSION SSL_MINOR_VERSION_2 #else #if defined(POLARSSL_SSL_PROTO_TLS1_2) #define SSL_MIN_MINOR_VERSION SSL_MINOR_VERSION_3 #endif /* POLARSSL_SSL_PROTO_TLS1_2 */ #endif /* POLARSSL_SSL_PROTO_TLS1_1 */ #endif /* POLARSSL_SSL_PROTO_TLS1 */ #endif /* POLARSSL_SSL_PROTO_SSL3 */ /* Determine maximum supported version */ #define SSL_MAX_MAJOR_VERSION SSL_MAJOR_VERSION_3 #if defined(POLARSSL_SSL_PROTO_TLS1_2) #define SSL_MAX_MINOR_VERSION SSL_MINOR_VERSION_3 #else #if defined(POLARSSL_SSL_PROTO_TLS1_1) #define SSL_MAX_MINOR_VERSION SSL_MINOR_VERSION_2 #else #if defined(POLARSSL_SSL_PROTO_TLS1) #define SSL_MAX_MINOR_VERSION SSL_MINOR_VERSION_1 #else #if defined(POLARSSL_SSL_PROTO_SSL3) #define SSL_MAX_MINOR_VERSION SSL_MINOR_VERSION_0 #endif /* POLARSSL_SSL_PROTO_SSL3 */ #endif /* POLARSSL_SSL_PROTO_TLS1 */ #endif /* POLARSSL_SSL_PROTO_TLS1_1 */ #endif /* POLARSSL_SSL_PROTO_TLS1_2 */ /* RFC 6066 section 4, see also mfl_code_to_length in ssl_tls.c * NONE must be zero so that memset()ing structure to zero works */ #define SSL_MAX_FRAG_LEN_NONE 0 /*!< don't use this extension */ #define SSL_MAX_FRAG_LEN_512 1 /*!< MaxFragmentLength 2^9 */ #define SSL_MAX_FRAG_LEN_1024 2 /*!< MaxFragmentLength 2^10 */ #define SSL_MAX_FRAG_LEN_2048 3 /*!< MaxFragmentLength 2^11 */ #define SSL_MAX_FRAG_LEN_4096 4 /*!< MaxFragmentLength 2^12 */ #define SSL_MAX_FRAG_LEN_INVALID 5 /*!< first invalid value */ #define SSL_IS_CLIENT 0 #define SSL_IS_SERVER 1 #define SSL_IS_NOT_FALLBACK 0 #define SSL_IS_FALLBACK 1 #define SSL_EXTENDED_MS_DISABLED 0 #define SSL_EXTENDED_MS_ENABLED 1 #define SSL_ETM_DISABLED 0 #define SSL_ETM_ENABLED 1 #define SSL_COMPRESS_NULL 0 #define SSL_COMPRESS_DEFLATE 1 #define SSL_VERIFY_NONE 0 #define SSL_VERIFY_OPTIONAL 1 #define SSL_VERIFY_REQUIRED 2 #define SSL_INITIAL_HANDSHAKE 0 #define SSL_RENEGOTIATION 1 /* In progress */ #define SSL_RENEGOTIATION_DONE 2 /* Done or aborted */ #define SSL_RENEGOTIATION_PENDING 3 /* Requested (server only) */ #define SSL_LEGACY_RENEGOTIATION 0 #define SSL_SECURE_RENEGOTIATION 1 #define SSL_RENEGOTIATION_DISABLED 0 #define SSL_RENEGOTIATION_ENABLED 1 #define SSL_ANTI_REPLAY_DISABLED 0 #define SSL_ANTI_REPLAY_ENABLED 1 #define SSL_RENEGOTIATION_NOT_ENFORCED -1 #define SSL_RENEGO_MAX_RECORDS_DEFAULT 16 #define SSL_LEGACY_NO_RENEGOTIATION 0 #define SSL_LEGACY_ALLOW_RENEGOTIATION 1 #define SSL_LEGACY_BREAK_HANDSHAKE 2 #define SSL_TRUNC_HMAC_DISABLED 0 #define SSL_TRUNC_HMAC_ENABLED 1 #define SSL_TRUNCATED_HMAC_LEN 10 /* 80 bits, rfc 6066 section 7 */ #define SSL_SESSION_TICKETS_DISABLED 0 #define SSL_SESSION_TICKETS_ENABLED 1 #define SSL_CBC_RECORD_SPLITTING_DISABLED -1 #define SSL_CBC_RECORD_SPLITTING_ENABLED 0 #define SSL_ARC4_ENABLED 0 #define SSL_ARC4_DISABLED 1 /* * DTLS retransmission states, see RFC 6347 4.2.4 * * The SENDING state is merged in PREPARING for initial sends, * but is distinct for resends. * * Note: initial state is wrong for server, but is not used anyway. */ #define SSL_RETRANS_PREPARING 0 #define SSL_RETRANS_SENDING 1 #define SSL_RETRANS_WAITING 2 #define SSL_RETRANS_FINISHED 3 /* * Default range for DTLS retransmission timer value, in milliseconds. * RFC 6347 4.2.4.1 says from 1 second to 60 seconds. */ #define SSL_DTLS_TIMEOUT_DFL_MIN 1000 #define SSL_DTLS_TIMEOUT_DFL_MAX 60000 /** * \name SECTION: Module settings * * The configuration options you can set for this module are in this section. * Either change them in config.h or define them on the compiler command line. * \{ */ #if !defined(SSL_DEFAULT_TICKET_LIFETIME) #define SSL_DEFAULT_TICKET_LIFETIME 86400 /**< Lifetime of session tickets (if enabled) */ #endif /* * Size of the input / output buffer. * Note: the RFC defines the default size of SSL / TLS messages. If you * change the value here, other clients / servers may not be able to * communicate with you anymore. Only change this value if you control * both sides of the connection and have it reduced at both sides, or * if you're using the Max Fragment Length extension and you know all your * peers are using it too! */ #if !defined(SSL_MAX_CONTENT_LEN) #define SSL_MAX_CONTENT_LEN 16384 /**< Size of the input / output buffer */ #endif /* \} name SECTION: Module settings */ /* * Allow extra bytes for record, authentication and encryption overhead: * counter (8) + header (5) + IV(16) + MAC (16-48) + padding (0-256) * and allow for a maximum of 1024 of compression expansion if * enabled. */ #if defined(POLARSSL_ZLIB_SUPPORT) #define SSL_COMPRESSION_ADD 1024 #else #define SSL_COMPRESSION_ADD 0 #endif #if defined(POLARSSL_RC4_C) || defined(POLARSSL_CIPHER_MODE_CBC) /* Ciphersuites using HMAC */ #if defined(POLARSSL_SHA512_C) #define SSL_MAC_ADD 48 /* SHA-384 used for HMAC */ #elif defined(POLARSSL_SHA256_C) #define SSL_MAC_ADD 32 /* SHA-256 used for HMAC */ #else #define SSL_MAC_ADD 20 /* SHA-1 used for HMAC */ #endif #else /* AEAD ciphersuites: GCM and CCM use a 128 bits tag */ #define SSL_MAC_ADD 16 #endif #if defined(POLARSSL_CIPHER_MODE_CBC) #define SSL_PADDING_ADD 256 #else #define SSL_PADDING_ADD 0 #endif #define SSL_BUFFER_LEN ( SSL_MAX_CONTENT_LEN \ + SSL_COMPRESSION_ADD \ + 29 /* counter + header + IV */ \ + SSL_MAC_ADD \ + SSL_PADDING_ADD \ ) /* * Length of the verify data for secure renegotiation */ #if defined(POLARSSL_SSL_PROTO_SSL3) #define SSL_VERIFY_DATA_MAX_LEN 36 #else #define SSL_VERIFY_DATA_MAX_LEN 12 #endif /* * Signaling ciphersuite values (SCSV) */ #define SSL_EMPTY_RENEGOTIATION_INFO 0xFF /**< renegotiation info ext */ #define SSL_FALLBACK_SCSV 0x5600 /**< draft-ietf-tls-downgrade-scsv-00 */ /* * Supported Signature and Hash algorithms (For TLS 1.2) * RFC 5246 section 7.4.1.4.1 */ #define SSL_HASH_NONE 0 #define SSL_HASH_MD5 1 #define SSL_HASH_SHA1 2 #define SSL_HASH_SHA224 3 #define SSL_HASH_SHA256 4 #define SSL_HASH_SHA384 5 #define SSL_HASH_SHA512 6 #define SSL_SIG_ANON 0 #define SSL_SIG_RSA 1 #define SSL_SIG_ECDSA 3 /* * Client Certificate Types * RFC 5246 section 7.4.4 plus RFC 4492 section 5.5 */ #define SSL_CERT_TYPE_RSA_SIGN 1 #define SSL_CERT_TYPE_ECDSA_SIGN 64 /* * Message, alert and handshake types */ #define SSL_MSG_CHANGE_CIPHER_SPEC 20 #define SSL_MSG_ALERT 21 #define SSL_MSG_HANDSHAKE 22 #define SSL_MSG_APPLICATION_DATA 23 #define SSL_ALERT_LEVEL_WARNING 1 #define SSL_ALERT_LEVEL_FATAL 2 #define SSL_ALERT_MSG_CLOSE_NOTIFY 0 /* 0x00 */ #define SSL_ALERT_MSG_UNEXPECTED_MESSAGE 10 /* 0x0A */ #define SSL_ALERT_MSG_BAD_RECORD_MAC 20 /* 0x14 */ #define SSL_ALERT_MSG_DECRYPTION_FAILED 21 /* 0x15 */ #define SSL_ALERT_MSG_RECORD_OVERFLOW 22 /* 0x16 */ #define SSL_ALERT_MSG_DECOMPRESSION_FAILURE 30 /* 0x1E */ #define SSL_ALERT_MSG_HANDSHAKE_FAILURE 40 /* 0x28 */ #define SSL_ALERT_MSG_NO_CERT 41 /* 0x29 */ #define SSL_ALERT_MSG_BAD_CERT 42 /* 0x2A */ #define SSL_ALERT_MSG_UNSUPPORTED_CERT 43 /* 0x2B */ #define SSL_ALERT_MSG_CERT_REVOKED 44 /* 0x2C */ #define SSL_ALERT_MSG_CERT_EXPIRED 45 /* 0x2D */ #define SSL_ALERT_MSG_CERT_UNKNOWN 46 /* 0x2E */ #define SSL_ALERT_MSG_ILLEGAL_PARAMETER 47 /* 0x2F */ #define SSL_ALERT_MSG_UNKNOWN_CA 48 /* 0x30 */ #define SSL_ALERT_MSG_ACCESS_DENIED 49 /* 0x31 */ #define SSL_ALERT_MSG_DECODE_ERROR 50 /* 0x32 */ #define SSL_ALERT_MSG_DECRYPT_ERROR 51 /* 0x33 */ #define SSL_ALERT_MSG_EXPORT_RESTRICTION 60 /* 0x3C */ #define SSL_ALERT_MSG_PROTOCOL_VERSION 70 /* 0x46 */ #define SSL_ALERT_MSG_INSUFFICIENT_SECURITY 71 /* 0x47 */ #define SSL_ALERT_MSG_INTERNAL_ERROR 80 /* 0x50 */ #define SSL_ALERT_MSG_INAPROPRIATE_FALLBACK 86 /* 0x56 */ #define SSL_ALERT_MSG_USER_CANCELED 90 /* 0x5A */ #define SSL_ALERT_MSG_NO_RENEGOTIATION 100 /* 0x64 */ #define SSL_ALERT_MSG_UNSUPPORTED_EXT 110 /* 0x6E */ #define SSL_ALERT_MSG_UNRECOGNIZED_NAME 112 /* 0x70 */ #define SSL_ALERT_MSG_UNKNOWN_PSK_IDENTITY 115 /* 0x73 */ #define SSL_ALERT_MSG_NO_APPLICATION_PROTOCOL 120 /* 0x78 */ #define SSL_HS_HELLO_REQUEST 0 #define SSL_HS_CLIENT_HELLO 1 #define SSL_HS_SERVER_HELLO 2 #define SSL_HS_HELLO_VERIFY_REQUEST 3 #define SSL_HS_NEW_SESSION_TICKET 4 #define SSL_HS_CERTIFICATE 11 #define SSL_HS_SERVER_KEY_EXCHANGE 12 #define SSL_HS_CERTIFICATE_REQUEST 13 #define SSL_HS_SERVER_HELLO_DONE 14 #define SSL_HS_CERTIFICATE_VERIFY 15 #define SSL_HS_CLIENT_KEY_EXCHANGE 16 #define SSL_HS_FINISHED 20 /* * TLS extensions */ #define TLS_EXT_SERVERNAME 0 #define TLS_EXT_SERVERNAME_HOSTNAME 0 #define TLS_EXT_MAX_FRAGMENT_LENGTH 1 #define TLS_EXT_TRUNCATED_HMAC 4 #define TLS_EXT_SUPPORTED_ELLIPTIC_CURVES 10 #define TLS_EXT_SUPPORTED_POINT_FORMATS 11 #define TLS_EXT_SIG_ALG 13 #define TLS_EXT_ALPN 16 #define TLS_EXT_ENCRYPT_THEN_MAC 22 /* 0x16 */ #define TLS_EXT_EXTENDED_MASTER_SECRET 0x0017 /* 23 */ #define TLS_EXT_SESSION_TICKET 35 #define TLS_EXT_RENEGOTIATION_INFO 0xFF01 /* * TLS extension flags (for extensions with outgoing ServerHello content * that need it (e.g. for RENEGOTIATION_INFO the server already knows because * of state of the renegotiation flag, so no indicator is required) */ #define TLS_EXT_SUPPORTED_POINT_FORMATS_PRESENT (1 << 0) /* * Size defines */ #if !defined(POLARSSL_PSK_MAX_LEN) #define POLARSSL_PSK_MAX_LEN 32 /* 256 bits */ #endif /* Dummy type used only for its size */ union _ssl_premaster_secret { #if defined(POLARSSL_KEY_EXCHANGE_RSA_ENABLED) unsigned char _pms_rsa[48]; /* RFC 5246 8.1.1 */ #endif #if defined(POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED) unsigned char _pms_dhm[POLARSSL_MPI_MAX_SIZE]; /* RFC 5246 8.1.2 */ #endif #if defined(POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \ defined(POLARSSL_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) || \ defined(POLARSSL_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \ defined(POLARSSL_KEY_EXCHANGE_ECDH_ECDSA_ENABLED) unsigned char _pms_ecdh[POLARSSL_ECP_MAX_BYTES]; /* RFC 4492 5.10 */ #endif #if defined(POLARSSL_KEY_EXCHANGE_PSK_ENABLED) unsigned char _pms_psk[4 + 2 * POLARSSL_PSK_MAX_LEN]; /* RFC 4279 2 */ #endif #if defined(POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED) unsigned char _pms_dhe_psk[4 + POLARSSL_MPI_MAX_SIZE + POLARSSL_PSK_MAX_LEN]; /* RFC 4279 3 */ #endif #if defined(POLARSSL_KEY_EXCHANGE_RSA_PSK_ENABLED) unsigned char _pms_rsa_psk[52 + POLARSSL_PSK_MAX_LEN]; /* RFC 4279 4 */ #endif #if defined(POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED) unsigned char _pms_ecdhe_psk[4 + POLARSSL_ECP_MAX_BYTES + POLARSSL_PSK_MAX_LEN]; /* RFC 5489 2 */ #endif }; #define POLARSSL_PREMASTER_SIZE sizeof( union _ssl_premaster_secret ) #ifdef __cplusplus extern "C" { #endif /* * Generic function pointers for allowing external RSA private key * implementations. */ typedef int (*rsa_decrypt_func)( void *ctx, int mode, size_t *olen, const unsigned char *input, unsigned char *output, size_t output_max_len ); typedef int (*rsa_sign_func)( void *ctx, int (*f_rng)(void *, unsigned char *, size_t), void *p_rng, int mode, md_type_t md_alg, unsigned int hashlen, const unsigned char *hash, unsigned char *sig ); typedef size_t (*rsa_key_len_func)( void *ctx ); /* * SSL state machine */ typedef enum { SSL_HELLO_REQUEST, SSL_CLIENT_HELLO, SSL_SERVER_HELLO, SSL_SERVER_CERTIFICATE, SSL_SERVER_KEY_EXCHANGE, SSL_CERTIFICATE_REQUEST, SSL_SERVER_HELLO_DONE, SSL_CLIENT_CERTIFICATE, SSL_CLIENT_KEY_EXCHANGE, SSL_CERTIFICATE_VERIFY, SSL_CLIENT_CHANGE_CIPHER_SPEC, SSL_CLIENT_FINISHED, SSL_SERVER_CHANGE_CIPHER_SPEC, SSL_SERVER_FINISHED, SSL_FLUSH_BUFFERS, SSL_HANDSHAKE_WRAPUP, SSL_HANDSHAKE_OVER, SSL_SERVER_NEW_SESSION_TICKET, SSL_SERVER_HELLO_VERIFY_REQUEST_SENT, } ssl_states; typedef struct _ssl_session ssl_session; typedef struct _ssl_context ssl_context; typedef struct _ssl_transform ssl_transform; typedef struct _ssl_handshake_params ssl_handshake_params; #if defined(POLARSSL_SSL_SESSION_TICKETS) typedef struct _ssl_ticket_keys ssl_ticket_keys; #endif #if defined(POLARSSL_X509_CRT_PARSE_C) typedef struct _ssl_key_cert ssl_key_cert; #endif #if defined(POLARSSL_SSL_PROTO_DTLS) typedef struct _ssl_flight_item ssl_flight_item; #endif /* * This structure is used for storing current session data. */ struct _ssl_session { #if defined(POLARSSL_HAVE_TIME) time_t start; /*!< starting time */ #endif int ciphersuite; /*!< chosen ciphersuite */ int compression; /*!< chosen compression */ size_t length; /*!< session id length */ unsigned char id[32]; /*!< session identifier */ unsigned char master[48]; /*!< the master secret */ #if defined(POLARSSL_X509_CRT_PARSE_C) x509_crt *peer_cert; /*!< peer X.509 cert chain */ #endif /* POLARSSL_X509_CRT_PARSE_C */ int verify_result; /*!< verification result */ #if defined(POLARSSL_SSL_SESSION_TICKETS) unsigned char *ticket; /*!< RFC 5077 session ticket */ size_t ticket_len; /*!< session ticket length */ uint32_t ticket_lifetime; /*!< ticket lifetime hint */ #endif /* POLARSSL_SSL_SESSION_TICKETS */ #if defined(POLARSSL_SSL_MAX_FRAGMENT_LENGTH) unsigned char mfl_code; /*!< MaxFragmentLength negotiated by peer */ #endif /* POLARSSL_SSL_MAX_FRAGMENT_LENGTH */ #if defined(POLARSSL_SSL_TRUNCATED_HMAC) int trunc_hmac; /*!< flag for truncated hmac activation */ #endif /* POLARSSL_SSL_TRUNCATED_HMAC */ #if defined(POLARSSL_SSL_ENCRYPT_THEN_MAC) int encrypt_then_mac; /*!< flag for EtM activation */ #endif }; /* * This structure contains a full set of runtime transform parameters * either in negotiation or active. */ struct _ssl_transform { /* * Session specific crypto layer */ const ssl_ciphersuite_t *ciphersuite_info; /*!< Chosen cipersuite_info */ unsigned int keylen; /*!< symmetric key length */ size_t minlen; /*!< min. ciphertext length */ size_t ivlen; /*!< IV length */ size_t fixed_ivlen; /*!< Fixed part of IV (AEAD) */ size_t maclen; /*!< MAC length */ unsigned char iv_enc[16]; /*!< IV (encryption) */ unsigned char iv_dec[16]; /*!< IV (decryption) */ #if defined(POLARSSL_SSL_PROTO_SSL3) /* Needed only for SSL v3.0 secret */ unsigned char mac_enc[20]; /*!< SSL v3.0 secret (enc) */ unsigned char mac_dec[20]; /*!< SSL v3.0 secret (dec) */ #endif /* POLARSSL_SSL_PROTO_SSL3 */ md_context_t md_ctx_enc; /*!< MAC (encryption) */ md_context_t md_ctx_dec; /*!< MAC (decryption) */ cipher_context_t cipher_ctx_enc; /*!< encryption context */ cipher_context_t cipher_ctx_dec; /*!< decryption context */ /* * Session specific compression layer */ #if defined(POLARSSL_ZLIB_SUPPORT) z_stream ctx_deflate; /*!< compression context */ z_stream ctx_inflate; /*!< decompression context */ #endif }; /* * This structure contains the parameters only needed during handshake. */ struct _ssl_handshake_params { /* * Handshake specific crypto variables */ int sig_alg; /*!< Hash algorithm for signature */ int cert_type; /*!< Requested cert type */ int verify_sig_alg; /*!< Signature algorithm for verify */ #if defined(POLARSSL_DHM_C) dhm_context dhm_ctx; /*!< DHM key exchange */ #endif #if defined(POLARSSL_ECDH_C) ecdh_context ecdh_ctx; /*!< ECDH key exchange */ #endif #if defined(POLARSSL_ECDH_C) || defined(POLARSSL_ECDSA_C) const ecp_curve_info **curves; /*!< Supported elliptic curves */ #endif #if defined(POLARSSL_X509_CRT_PARSE_C) /** * Current key/cert or key/cert list. * On client: pointer to ssl->key_cert, only the first entry used. * On server: starts as a pointer to ssl->key_cert, then becomes * a pointer to the chosen key from this list or the SNI list. */ ssl_key_cert *key_cert; #if defined(POLARSSL_SSL_SERVER_NAME_INDICATION) ssl_key_cert *sni_key_cert; /*!< key/cert list from SNI */ #endif #endif /* POLARSSL_X509_CRT_PARSE_C */ #if defined(POLARSSL_SSL_PROTO_DTLS) unsigned int out_msg_seq; /*!< Outgoing handshake sequence number */ unsigned int in_msg_seq; /*!< Incoming handshake sequence number */ unsigned char *verify_cookie; /*!< Cli: HelloVerifyRequest cookie Srv: unused */ unsigned char verify_cookie_len; /*!< Cli: cookie length Srv: flag for sending a cookie */ unsigned char *hs_msg; /*!< Reassembled handshake message */ uint32_t retransmit_timeout; /*!< Current value of timeout */ unsigned char retransmit_state; /*!< Retransmission state */ ssl_flight_item *flight; /*!< Current outgoing flight */ ssl_flight_item *cur_msg; /*!< Current message in flight */ unsigned int in_flight_start_seq; /*!< Minimum message sequence in the flight being received */ ssl_transform *alt_transform_out; /*!< Alternative transform for resending messages */ unsigned char alt_out_ctr[8]; /*!< Alternative record epoch/counter for resending messages */ #endif /* * Checksum contexts */ #if defined(POLARSSL_SSL_PROTO_SSL3) || defined(POLARSSL_SSL_PROTO_TLS1) || \ defined(POLARSSL_SSL_PROTO_TLS1_1) md5_context fin_md5; sha1_context fin_sha1; #endif #if defined(POLARSSL_SSL_PROTO_TLS1_2) #if defined(POLARSSL_SHA256_C) sha256_context fin_sha256; #endif #if defined(POLARSSL_SHA512_C) sha512_context fin_sha512; #endif #endif /* POLARSSL_SSL_PROTO_TLS1_2 */ void (*update_checksum)(ssl_context *, const unsigned char *, size_t); void (*calc_verify)(ssl_context *, unsigned char *); void (*calc_finished)(ssl_context *, unsigned char *, int); int (*tls_prf)(const unsigned char *, size_t, const char *, const unsigned char *, size_t, unsigned char *, size_t); size_t pmslen; /*!< premaster length */ unsigned char randbytes[64]; /*!< random bytes */ unsigned char premaster[POLARSSL_PREMASTER_SIZE]; /*!< premaster secret */ int resume; /*!< session resume indicator*/ int max_major_ver; /*!< max. major version client*/ int max_minor_ver; /*!< max. minor version client*/ int cli_exts; /*!< client extension presence*/ #if defined(POLARSSL_SSL_SESSION_TICKETS) int new_session_ticket; /*!< use NewSessionTicket? */ #endif /* POLARSSL_SSL_SESSION_TICKETS */ #if defined(POLARSSL_SSL_EXTENDED_MASTER_SECRET) int extended_ms; /*!< use Extended Master Secret? */ #endif }; #if defined(POLARSSL_SSL_SESSION_TICKETS) /* * Parameters needed to secure session tickets */ struct _ssl_ticket_keys { unsigned char key_name[16]; /*!< name to quickly discard bad tickets */ aes_context enc; /*!< encryption context */ aes_context dec; /*!< decryption context */ unsigned char mac_key[16]; /*!< authentication key */ }; #endif /* POLARSSL_SSL_SESSION_TICKETS */ #if defined(POLARSSL_X509_CRT_PARSE_C) /* * List of certificate + private key pairs */ struct _ssl_key_cert { x509_crt *cert; /*!< cert */ pk_context *key; /*!< private key */ int key_own_alloc; /*!< did we allocate key? */ ssl_key_cert *next; /*!< next key/cert pair */ }; #endif /* POLARSSL_X509_CRT_PARSE_C */ #if defined(POLARSSL_SSL_PROTO_DTLS) /* * List of handshake messages kept around for resending */ struct _ssl_flight_item { unsigned char *p; /*!< message, including handshake headers */ size_t len; /*!< length of p */ unsigned char type; /*!< type of the message: handshake or CCS */ ssl_flight_item *next; /*!< next handshake message(s) */ }; #endif /* POLARSSL_SSL_PROTO_DTLS */ struct _ssl_context { /* * Miscellaneous */ int state; /*!< SSL handshake: current state */ int transport; /*!< Transport: stream or datagram */ int renegotiation; /*!< Initial or renegotiation */ #if defined(POLARSSL_SSL_RENEGOTIATION) int renego_records_seen; /*!< Records since renego request, or with DTLS, number of retransmissions of request if renego_max_records is < 0 */ #endif int major_ver; /*!< equal to SSL_MAJOR_VERSION_3 */ int minor_ver; /*!< either 0 (SSL3) or 1 (TLS1.0) */ int max_major_ver; /*!< max. major version used */ int max_minor_ver; /*!< max. minor version used */ int min_major_ver; /*!< min. major version used */ int min_minor_ver; /*!< min. minor version used */ uint32_t read_timeout; /*!< timeout for ssl_read in milliseconds */ #if defined(POLARSSL_SSL_DTLS_BADMAC_LIMIT) unsigned badmac_limit; /*!< limit of records with a bad MAC */ unsigned badmac_seen; /*!< records with a bad MAC received */ #endif #if defined(POLARSSL_SSL_FALLBACK_SCSV) && defined(POLARSSL_SSL_CLI_C) char fallback; /*!< flag for fallback connections */ #endif #if defined(POLARSSL_SSL_ENCRYPT_THEN_MAC) char encrypt_then_mac; /*!< flag for encrypt-then-mac */ #endif #if defined(POLARSSL_SSL_EXTENDED_MASTER_SECRET) char extended_ms; /*!< flag for extended master secret */ #endif char arc4_disabled; /*!< flag for disabling RC4 */ /* * Callbacks (RNG, debug, I/O, verification) */ int (*f_rng)(void *, unsigned char *, size_t); void (*f_dbg)(void *, int, const char *); int (*f_send)(void *, const unsigned char *, size_t); int (*f_recv)(void *, unsigned char *, size_t); int (*f_recv_timeout)(void *, unsigned char *, size_t, uint32_t); int (*f_get_cache)(void *, ssl_session *); int (*f_set_cache)(void *, const ssl_session *); void *p_rng; /*!< context for the RNG function */ void *p_dbg; /*!< context for the debug function */ void *p_bio; /*!< context for I/O operations */ void *p_get_cache; /*!< context for cache retrieval */ void *p_set_cache; /*!< context for cache store */ void *p_hw_data; /*!< context for HW acceleration */ #if defined(POLARSSL_SSL_SERVER_NAME_INDICATION) int (*f_sni)(void *, ssl_context *, const unsigned char *, size_t); void *p_sni; /*!< context for SNI extension */ #endif #if defined(POLARSSL_X509_CRT_PARSE_C) int (*f_vrfy)(void *, x509_crt *, int, int *); void *p_vrfy; /*!< context for verification */ #endif #if defined(POLARSSL_KEY_EXCHANGE__SOME__PSK_ENABLED) int (*f_psk)(void *, ssl_context *, const unsigned char *, size_t); void *p_psk; /*!< context for PSK retrieval */ #endif /* * Session layer */ ssl_session *session_in; /*!< current session data (in) */ ssl_session *session_out; /*!< current session data (out) */ ssl_session *session; /*!< negotiated session data */ ssl_session *session_negotiate; /*!< session data in negotiation */ ssl_handshake_params *handshake; /*!< params required only during the handshake process */ /* * Record layer transformations */ ssl_transform *transform_in; /*!< current transform params (in) */ ssl_transform *transform_out; /*!< current transform params (in) */ ssl_transform *transform; /*!< negotiated transform params */ ssl_transform *transform_negotiate; /*!< transform params in negotiation */ /* * Timers */ #if defined(POLARSSL_SSL_PROTO_DTLS) struct hr_time time_info; /*!< timer context */ unsigned long time_limit; /*!< limit for the running timer */ uint32_t hs_timeout_min; /*!< initial value of the handshake retransmission timeout */ uint32_t hs_timeout_max; /*!< maximum value of the handshake retransmission timeout */ #endif /* * Record layer (incoming data) */ unsigned char *in_buf; /*!< input buffer */ unsigned char *in_ctr; /*!< 64-bit incoming message counter TLS: maintained by us DTLS: read from peer */ unsigned char *in_hdr; /*!< start of record header */ unsigned char *in_len; /*!< two-bytes message length field */ unsigned char *in_iv; /*!< ivlen-byte IV */ unsigned char *in_msg; /*!< message contents (in_iv+ivlen) */ unsigned char *in_offt; /*!< read offset in application data */ int in_msgtype; /*!< record header: message type */ size_t in_msglen; /*!< record header: message length */ size_t in_left; /*!< amount of data read so far */ #if defined(POLARSSL_SSL_PROTO_DTLS) uint16_t in_epoch; /*!< DTLS epoch for incoming records */ size_t next_record_offset; /*!< offset of the next record in datagram (equal to in_left if none) */ #endif #if defined(POLARSSL_SSL_DTLS_ANTI_REPLAY) uint64_t in_window_top; /*!< last validated record seq_num */ uint64_t in_window; /*!< bitmask for replay detection */ char anti_replay; /*!< is anti-replay on? */ #endif size_t in_hslen; /*!< current handshake message length, including the handshake header */ int nb_zero; /*!< # of 0-length encrypted messages */ int record_read; /*!< record is already present */ /* * Record layer (outgoing data) */ unsigned char *out_buf; /*!< output buffer */ unsigned char *out_ctr; /*!< 64-bit outgoing message counter */ unsigned char *out_hdr; /*!< start of record header */ unsigned char *out_len; /*!< two-bytes message length field */ unsigned char *out_iv; /*!< ivlen-byte IV */ unsigned char *out_msg; /*!< message contents (out_iv+ivlen) */ int out_msgtype; /*!< record header: message type */ size_t out_msglen; /*!< record header: message length */ size_t out_left; /*!< amount of data not yet written */ #if defined(POLARSSL_ZLIB_SUPPORT) unsigned char *compress_buf; /*!< zlib data buffer */ #endif #if defined(POLARSSL_SSL_MAX_FRAGMENT_LENGTH) unsigned char mfl_code; /*!< MaxFragmentLength chosen by us */ #endif /* POLARSSL_SSL_MAX_FRAGMENT_LENGTH */ #if defined(POLARSSL_SSL_CBC_RECORD_SPLITTING) signed char split_done; /*!< flag for record splitting: -1 disabled, 0 todo, 1 done */ #endif /* * PKI layer */ #if defined(POLARSSL_X509_CRT_PARSE_C) ssl_key_cert *key_cert; /*!< own certificate(s)/key(s) */ x509_crt *ca_chain; /*!< own trusted CA chain */ x509_crl *ca_crl; /*!< trusted CA CRLs */ const char *peer_cn; /*!< expected peer CN */ #endif /* POLARSSL_X509_CRT_PARSE_C */ /* * Support for generating and checking session tickets */ #if defined(POLARSSL_SSL_SESSION_TICKETS) ssl_ticket_keys *ticket_keys; /*!< keys for ticket encryption */ #endif /* POLARSSL_SSL_SESSION_TICKETS */ /* * User settings */ int endpoint; /*!< 0: client, 1: server */ int authmode; /*!< verification mode */ int client_auth; /*!< flag for client auth. */ int verify_result; /*!< verification result */ #if defined(POLARSSL_SSL_RENEGOTIATION) int disable_renegotiation; /*!< enable/disable renegotiation */ int renego_max_records; /*!< grace period for renegotiation */ unsigned char renego_period[8]; /*!< value of the record counters that triggers renegotiation */ #endif int allow_legacy_renegotiation; /*!< allow legacy renegotiation */ const int *ciphersuite_list[4]; /*!< allowed ciphersuites / version */ #if defined(POLARSSL_SSL_SET_CURVES) const ecp_group_id *curve_list; /*!< allowed curves */ #endif #if defined(POLARSSL_SSL_TRUNCATED_HMAC) int trunc_hmac; /*!< negotiate truncated hmac? */ #endif #if defined(POLARSSL_SSL_SESSION_TICKETS) int session_tickets; /*!< use session tickets? */ int ticket_lifetime; /*!< session ticket lifetime */ #endif #if defined(POLARSSL_DHM_C) mpi dhm_P; /*!< prime modulus for DHM */ mpi dhm_G; /*!< generator for DHM */ #endif #if defined(POLARSSL_KEY_EXCHANGE__SOME__PSK_ENABLED) /* * PSK values */ unsigned char *psk; size_t psk_len; unsigned char *psk_identity; size_t psk_identity_len; #endif #if defined(POLARSSL_SSL_SERVER_NAME_INDICATION) /* * SNI extension */ unsigned char *hostname; size_t hostname_len; #endif #if defined(POLARSSL_SSL_ALPN) /* * ALPN extension */ const char **alpn_list; /*!< ordered list of supported protocols */ const char *alpn_chosen; /*!< negotiated protocol */ #endif /* * Information for DTLS hello verify */ #if defined(POLARSSL_SSL_DTLS_HELLO_VERIFY) unsigned char *cli_id; /*!< transport-level ID of the client */ size_t cli_id_len; /*!< length of cli_id */ int (*f_cookie_write)( void *, unsigned char **, unsigned char *, const unsigned char *, size_t ); int (*f_cookie_check)( void *, const unsigned char *, size_t, const unsigned char *, size_t ); void *p_cookie; /*!< context for the cookie callbacks */ #endif /* * Secure renegotiation */ int secure_renegotiation; /*!< does peer support legacy or secure renegotiation */ #if defined(POLARSSL_SSL_RENEGOTIATION) size_t verify_data_len; /*!< length of verify data stored */ char own_verify_data[SSL_VERIFY_DATA_MAX_LEN]; /*!< previous handshake verify data */ char peer_verify_data[SSL_VERIFY_DATA_MAX_LEN]; /*!< previous handshake verify data */ #endif }; #if defined(POLARSSL_SSL_HW_RECORD_ACCEL) #define SSL_CHANNEL_OUTBOUND 0 #define SSL_CHANNEL_INBOUND 1 extern int (*ssl_hw_record_init)(ssl_context *ssl, const unsigned char *key_enc, const unsigned char *key_dec, size_t keylen, const unsigned char *iv_enc, const unsigned char *iv_dec, size_t ivlen, const unsigned char *mac_enc, const unsigned char *mac_dec, size_t maclen); extern int (*ssl_hw_record_activate)(ssl_context *ssl, int direction); extern int (*ssl_hw_record_reset)(ssl_context *ssl); extern int (*ssl_hw_record_write)(ssl_context *ssl); extern int (*ssl_hw_record_read)(ssl_context *ssl); extern int (*ssl_hw_record_finish)(ssl_context *ssl); #endif /* POLARSSL_SSL_HW_RECORD_ACCEL */ /** * \brief Returns the list of ciphersuites supported by the SSL/TLS module. * * \return a statically allocated array of ciphersuites, the last * entry is 0. */ const int *ssl_list_ciphersuites( void ); /** * \brief Return the name of the ciphersuite associated with the * given ID * * \param ciphersuite_id SSL ciphersuite ID * * \return a string containing the ciphersuite name */ const char *ssl_get_ciphersuite_name( const int ciphersuite_id ); /** * \brief Return the ID of the ciphersuite associated with the * given name * * \param ciphersuite_name SSL ciphersuite name * * \return the ID with the ciphersuite or 0 if not found */ int ssl_get_ciphersuite_id( const char *ciphersuite_name ); /** * \brief Initialize an SSL context * (An individual SSL context is not thread-safe) * * \param ssl SSL context * * \return 0 if successful, or POLARSSL_ERR_SSL_MALLOC_FAILED if * memory allocation failed */ int ssl_init( ssl_context *ssl ); /** * \brief Reset an already initialized SSL context for re-use * while retaining application-set variables, function * pointers and data. * * \param ssl SSL context * \return 0 if successful, or POLASSL_ERR_SSL_MALLOC_FAILED, POLARSSL_ERR_SSL_HW_ACCEL_FAILED or * POLARSSL_ERR_SSL_COMPRESSION_FAILED */ int ssl_session_reset( ssl_context *ssl ); /** * \brief Set the current endpoint type * * \param ssl SSL context * \param endpoint must be SSL_IS_CLIENT or SSL_IS_SERVER * * \note This function should be called right after ssl_init() since * some other ssl_set_foo() functions depend on it. */ void ssl_set_endpoint( ssl_context *ssl, int endpoint ); /** * \brief Set the transport type (TLS or DTLS). * Default: TLS * * \param ssl SSL context * \param transport transport type: * SSL_TRANSPORT_STREAM for TLS, * SSL_TRANSPORT_DATAGRAM for DTLS. * \return 0 on success or POLARSSL_ERR_SSL_BAD_INPUT_DATA * * \note If DTLS is selected and max and/or min version are less * than TLS 1.1 (DTLS 1.0) they are upped to that value. * * \note For DTLS, you must either provide a recv callback that * doesn't block, or one that handles timeouts, see * ssl_set_bio_timeout() */ int ssl_set_transport( ssl_context *ssl, int transport ); /** * \brief Set the certificate verification mode * * \param ssl SSL context * \param authmode can be: * * SSL_VERIFY_NONE: peer certificate is not checked (default), * this is insecure and SHOULD be avoided. * * SSL_VERIFY_OPTIONAL: peer certificate is checked, however the * handshake continues even if verification failed; * ssl_get_verify_result() can be called after the * handshake is complete. * * SSL_VERIFY_REQUIRED: peer *must* present a valid certificate, * handshake is aborted if verification failed. * * \note On client, SSL_VERIFY_REQUIRED is the recommended mode. * With SSL_VERIFY_OPTIONAL, the user needs to call ssl_get_verify_result() at * the right time(s), which may not be obvious, while REQUIRED always perform * the verification as soon as possible. For example, REQUIRED was protecting * against the "triple handshake" attack even before it was found. */ void ssl_set_authmode( ssl_context *ssl, int authmode ); #if defined(POLARSSL_X509_CRT_PARSE_C) /** * \brief Set the verification callback (Optional). * * If set, the verify callback is called for each * certificate in the chain. For implementation * information, please see \c x509parse_verify() * * \param ssl SSL context * \param f_vrfy verification function * \param p_vrfy verification parameter */ void ssl_set_verify( ssl_context *ssl, int (*f_vrfy)(void *, x509_crt *, int, int *), void *p_vrfy ); #endif /* POLARSSL_X509_CRT_PARSE_C */ /** * \brief Set the random number generator callback * * \param ssl SSL context * \param f_rng RNG function * \param p_rng RNG parameter */ void ssl_set_rng( ssl_context *ssl, int (*f_rng)(void *, unsigned char *, size_t), void *p_rng ); /** * \brief Set the debug callback * * \param ssl SSL context * \param f_dbg debug function * \param p_dbg debug parameter */ void ssl_set_dbg( ssl_context *ssl, void (*f_dbg)(void *, int, const char *), void *p_dbg ); /** * \brief Set the underlying BIO read and write callbacks * * \param ssl SSL context * \param f_recv read callback * \param p_recv read parameter (must be equal to write parameter) * \param f_send write callback * \param p_send write parameter (must be equal to read parameter) * * \warning It is required that p_recv == p_send. Otherwise, the first * attempt at sending or receiving will result in a * POLARSSL_ERR_SSL_BAD_INPUT_DATA error. * * \deprecated Superseded by ssl_set_bio_timeout(). */ void ssl_set_bio( ssl_context *ssl, int (*f_recv)(void *, unsigned char *, size_t), void *p_recv, int (*f_send)(void *, const unsigned char *, size_t), void *p_send ); #if defined(POLARSSL_SSL_SRV_C) /** * \brief Set the underlying BIO callbacks for write, read and * read-with-timeout. * * \param ssl SSL context * \param p_bio parameter (context) shared by BIO callbacks * \param f_send write callback * \param f_recv read callback * \param f_recv_timeout read callback with timeout. * The last argument of the callback is the timeout in seconds * \param timeout value of the ssl_read() timeout in milliseconds * * \note f_recv_timeout is required for DTLS, unless f_recv performs * non-blocking reads. * * \note TODO: timeout not supported with TLS yet */ void ssl_set_bio_timeout( ssl_context *ssl, void *p_bio, int (*f_send)(void *, const unsigned char *, size_t), int (*f_recv)(void *, unsigned char *, size_t), int (*f_recv_timeout)(void *, unsigned char *, size_t, uint32_t), uint32_t timeout ); #if defined(POLARSSL_SSL_DTLS_HELLO_VERIFY) /** * \brief Set client's transport-level identification info. * (Server only. DTLS only.) * * This is usually the IP address (and port), but could be * anything identify the client depending on the underlying * network stack. Used for HelloVerifyRequest with DTLS. * This is *not* used to route the actual packets. * * \param ssl SSL context * \param info Transport-level info identifying the client (eg IP + port) * \param ilen Length of info in bytes * * \note An internal copy is made, so the info buffer can be reused. * * \return 0 on success, * POLARSSL_ERR_SSL_BAD_INPUT_DATA if used on client, * POLARSSL_ERR_SSL_MALLOC_FAILED if out of memory. */ int ssl_set_client_transport_id( ssl_context *ssl, const unsigned char *info, size_t ilen ); /** * \brief Callback type: generate a cookie * * \param ctx Context for the callback * \param p Buffer to write to, * must be updated to point right after the cookie * \param end Pointer to one past the end of the output buffer * \param info Client ID info that was passed to * \c ssl_set_client_transport_id() * \param ilen Length of info in bytes * * \return The callback must return 0 on success, * or a negative error code. */ typedef int ssl_cookie_write_t( void *ctx, unsigned char **p, unsigned char *end, const unsigned char *info, size_t ilen ); /** * \brief Callback type: verify a cookie * * \param ctx Context for the callback * \param cookie Cookie to verify * \param clen Length of cookie * \param info Client ID info that was passed to * \c ssl_set_client_transport_id() * \param ilen Length of info in bytes * * \return The callback must return 0 if cookie is valid, * or a negative error code. */ typedef int ssl_cookie_check_t( void *ctx, const unsigned char *cookie, size_t clen, const unsigned char *info, size_t ilen ); /** * \brief Register callbacks for DTLS cookies * (Server only. DTLS only.) * * Default: dummy callbacks that fail, to force you to * register working callbacks (and initialize their context). * * To disable HelloVerifyRequest, register NULL callbacks. * * \warning Disabling hello verification allows your server to be used * for amplification in DoS attacks against other hosts. * Only disable if you known this can't happen in your * particular environment. * * \param ssl SSL context * \param f_cookie_write Cookie write callback * \param f_cookie_check Cookie check callback * \param p_cookie Context for both callbacks */ void ssl_set_dtls_cookies( ssl_context *ssl, ssl_cookie_write_t *f_cookie_write, ssl_cookie_check_t *f_cookie_check, void *p_cookie ); #endif /* POLARSSL_SSL_DTLS_HELLO_VERIFY */ #if defined(POLARSSL_SSL_DTLS_ANTI_REPLAY) /** * \brief Enable or disable anti-replay protection for DTLS. * (DTLS only, no effect on TLS.) * Default: enabled. * * \param ssl SSL context * \param mode SSL_ANTI_REPLAY_ENABLED or SSL_ANTI_REPLAY_DISABLED. * * \warning Disabling this is a security risk unless the application * protocol handles duplicated packets in a safe way. You * should not disable this without careful consideration. * However, if your application already detects duplicated * packets and needs information about them to adjust its * transmission strategy, then you'll want to disable this. */ void ssl_set_dtls_anti_replay( ssl_context *ssl, char mode ); #endif /* POLARSSL_SSL_DTLS_ANTI_REPLAY */ #if defined(POLARSSL_SSL_DTLS_BADMAC_LIMIT) /** * \brief Set a limit on the number of records with a bad MAC * before terminating the connection. * (DTLS only, no effect on TLS.) * Default: 0 (disabled). * * \param ssl SSL context * \param limit Limit, or 0 to disable. * * \note If the limit is N, then the connection is terminated when * the Nth non-authentic record is seen. * * \note Records with an invalid header are not counted, only the * ones going through the authentication-decryption phase. * * \note This is a security trade-off related to the fact that it's * often relatively easy for an active attacker ot inject UDP * datagrams. On one hand, setting a low limit here makes it * easier for such an attacker to forcibly terminated a * connection. On the other hand, a high limit or no limit * might make us waste resources checking authentication on * many bogus packets. */ void ssl_set_dtls_badmac_limit( ssl_context *ssl, unsigned limit ); #endif /* POLARSSL_DTLS_BADMAC_LIMIT */ #if defined(POLARSSL_SSL_PROTO_DTLS) /** * \brief Set retransmit timeout values for the DTLS handshale. * (DTLS only, no effect on TLS.) * * \param ssl SSL context * \param min Initial timeout value in milliseconds. * Default: 1000 (1 second). * \param max Maximum timeout value in milliseconds. * Default: 60000 (60 seconds). * * \note Default values are from RFC 6347 section 4.2.4.1. * * \note Higher values for initial timeout may increase average * handshake latency. Lower values may increase the risk of * network congestion by causing more retransmissions. */ void ssl_set_handshake_timeout( ssl_context *ssl, uint32_t min, uint32_t max ); #endif /* POLARSSL_SSL_PROTO_DTLS */ /** * \brief Set the session cache callbacks (server-side only) * If not set, no session resuming is done (except if session * tickets are enabled too). * * The session cache has the responsibility to check for stale * entries based on timeout. See RFC 5246 for recommendations. * * Warning: session.peer_cert is cleared by the SSL/TLS layer on * connection shutdown, so do not cache the pointer! Either set * it to NULL or make a full copy of the certificate. * * The get callback is called once during the initial handshake * to enable session resuming. The get function has the * following parameters: (void *parameter, ssl_session *session) * If a valid entry is found, it should fill the master of * the session object with the cached values and return 0, * return 1 otherwise. Optionally peer_cert can be set as well * if it is properly present in cache entry. * * The set callback is called once during the initial handshake * to enable session resuming after the entire handshake has * been finished. The set function has the following parameters: * (void *parameter, const ssl_session *session). The function * should create a cache entry for future retrieval based on * the data in the session structure and should keep in mind * that the ssl_session object presented (and all its referenced * data) is cleared by the SSL/TLS layer when the connection is * terminated. It is recommended to add metadata to determine if * an entry is still valid in the future. Return 0 if * successfully cached, return 1 otherwise. * * \param ssl SSL context * \param f_get_cache session get callback * \param p_get_cache session get parameter * \param f_set_cache session set callback * \param p_set_cache session set parameter */ void ssl_set_session_cache( ssl_context *ssl, int (*f_get_cache)(void *, ssl_session *), void *p_get_cache, int (*f_set_cache)(void *, const ssl_session *), void *p_set_cache ); #endif /* POLARSSL_SSL_SRV_C */ #if defined(POLARSSL_SSL_CLI_C) /** * \brief Request resumption of session (client-side only) * Session data is copied from presented session structure. * * \param ssl SSL context * \param session session context * * \return 0 if successful, * POLARSSL_ERR_SSL_MALLOC_FAILED if memory allocation failed, * POLARSSL_ERR_SSL_BAD_INPUT_DATA if used server-side or * arguments are otherwise invalid * * \sa ssl_get_session() */ int ssl_set_session( ssl_context *ssl, const ssl_session *session ); #endif /* POLARSSL_SSL_CLI_C */ /** * \brief Set the list of allowed ciphersuites and the preference * order. First in the list has the highest preference. * (Overrides all version specific lists) * * Note: The server uses its own preferences * over the preference of the client unless * POLARSSL_SSL_SRV_RESPECT_CLIENT_PREFERENCE is defined! * * \param ssl SSL context * \param ciphersuites 0-terminated list of allowed ciphersuites */ void ssl_set_ciphersuites( ssl_context *ssl, const int *ciphersuites ); /** * \brief Set the list of allowed ciphersuites and the * preference order for a specific version of the protocol. * (Only useful on the server side) * * \param ssl SSL context * \param ciphersuites 0-terminated list of allowed ciphersuites * \param major Major version number (only SSL_MAJOR_VERSION_3 * supported) * \param minor Minor version number (SSL_MINOR_VERSION_0, * SSL_MINOR_VERSION_1 and SSL_MINOR_VERSION_2, * SSL_MINOR_VERSION_3 supported) * * \note With DTLS, use SSL_MINOR_VERSION_2 for DTLS 1.0 * and SSL_MINOR_VERSION_3 for DTLS 1.2 */ void ssl_set_ciphersuites_for_version( ssl_context *ssl, const int *ciphersuites, int major, int minor ); #if defined(POLARSSL_X509_CRT_PARSE_C) /** * \brief Set the data required to verify peer certificate * * \param ssl SSL context * \param ca_chain trusted CA chain (meaning all fully trusted top-level CAs) * \param ca_crl trusted CA CRLs * \param peer_cn expected peer CommonName (or NULL) */ void ssl_set_ca_chain( ssl_context *ssl, x509_crt *ca_chain, x509_crl *ca_crl, const char *peer_cn ); /** * \brief Set own certificate chain and private key * * \note own_cert should contain in order from the bottom up your * certificate chain. The top certificate (self-signed) * can be omitted. * * \note This function may be called more than once if you want to * support multiple certificates (eg, one using RSA and one * using ECDSA). However, on client, currently only the first * certificate is used (subsequent calls have no effect). * * \param ssl SSL context * \param own_cert own public certificate chain * \param pk_key own private key * * \return 0 on success or POLARSSL_ERR_SSL_MALLOC_FAILED */ int ssl_set_own_cert( ssl_context *ssl, x509_crt *own_cert, pk_context *pk_key ); #if defined(POLARSSL_RSA_C) /** * \brief Set own certificate chain and private RSA key * * Note: own_cert should contain IN order from the bottom * up your certificate chain. The top certificate (self-signed) * can be omitted. * * \warning This backwards-compatibility function is deprecated! * Please use \c ssl_set_own_cert() instead. * * \param ssl SSL context * \param own_cert own public certificate chain * \param rsa_key own private RSA key * * \return 0 on success, or a specific error code. */ int ssl_set_own_cert_rsa( ssl_context *ssl, x509_crt *own_cert, rsa_context *rsa_key ); #endif /* POLARSSL_RSA_C */ /** * \brief Set own certificate and external RSA private * key and handling callbacks, such as the PKCS#11 wrappers * or any other external private key handler. * (see the respective RSA functions in rsa.h for documentation * of the callback parameters, with the only change being * that the rsa_context * is a void * in the callbacks) * * Note: own_cert should contain IN order from the bottom * up your certificate chain. The top certificate (self-signed) * can be omitted. * * \warning This backwards-compatibility function is deprecated! * Please use \c pk_init_ctx_rsa_alt() * and \c ssl_set_own_cert() instead. * * \param ssl SSL context * \param own_cert own public certificate chain * \param rsa_key alternate implementation private RSA key * \param rsa_decrypt alternate implementation of \c rsa_pkcs1_decrypt() * \param rsa_sign alternate implementation of \c rsa_pkcs1_sign() * \param rsa_key_len function returning length of RSA key in bytes * * \return 0 on success, or a specific error code. */ int ssl_set_own_cert_alt( ssl_context *ssl, x509_crt *own_cert, void *rsa_key, rsa_decrypt_func rsa_decrypt, rsa_sign_func rsa_sign, rsa_key_len_func rsa_key_len ); #endif /* POLARSSL_X509_CRT_PARSE_C */ #if defined(POLARSSL_KEY_EXCHANGE__SOME__PSK_ENABLED) /** * \brief Set the Pre Shared Key (PSK) and the identity name connected * to it. * * \param ssl SSL context * \param psk pointer to the pre-shared key * \param psk_len pre-shared key length * \param psk_identity pointer to the pre-shared key identity * \param psk_identity_len identity key length * * \return 0 if successful or POLARSSL_ERR_SSL_MALLOC_FAILED */ int ssl_set_psk( ssl_context *ssl, const unsigned char *psk, size_t psk_len, const unsigned char *psk_identity, size_t psk_identity_len ); /** * \brief Set the PSK callback (server-side only) (Optional). * * If set, the PSK callback is called for each * handshake where a PSK ciphersuite was negotiated. * The caller provides the identity received and wants to * receive the actual PSK data and length. * * The callback has the following parameters: (void *parameter, * ssl_context *ssl, const unsigned char *psk_identity, * size_t identity_len) * If a valid PSK identity is found, the callback should use * ssl_set_psk() on the ssl context to set the correct PSK and * identity and return 0. * Any other return value will result in a denied PSK identity. * * \param ssl SSL context * \param f_psk PSK identity function * \param p_psk PSK identity parameter */ void ssl_set_psk_cb( ssl_context *ssl, int (*f_psk)(void *, ssl_context *, const unsigned char *, size_t), void *p_psk ); #endif /* POLARSSL_KEY_EXCHANGE__SOME__PSK_ENABLED */ #if defined(POLARSSL_DHM_C) /** * \brief Set the Diffie-Hellman public P and G values, * read as hexadecimal strings (server-side only) * (Default: POLARSSL_DHM_RFC5114_MODP_1024_[PG]) * * \param ssl SSL context * \param dhm_P Diffie-Hellman-Merkle modulus * \param dhm_G Diffie-Hellman-Merkle generator * * \return 0 if successful */ int ssl_set_dh_param( ssl_context *ssl, const char *dhm_P, const char *dhm_G ); /** * \brief Set the Diffie-Hellman public P and G values, * read from existing context (server-side only) * * \param ssl SSL context * \param dhm_ctx Diffie-Hellman-Merkle context * * \return 0 if successful */ int ssl_set_dh_param_ctx( ssl_context *ssl, dhm_context *dhm_ctx ); #endif /* POLARSSL_DHM_C */ #if defined(POLARSSL_SSL_SET_CURVES) /** * \brief Set the allowed curves in order of preference. * (Default: all defined curves.) * * On server: this only affects selection of the ECDHE curve; * the curves used for ECDH and ECDSA are determined by the * list of available certificates instead. * * On client: this affects the list of curves offered for any * use. The server can override our preference order. * * Both sides: limits the set of curves used by peer to the * listed curves for any use (ECDH(E), certificates). * * \param ssl SSL context * \param curves Ordered list of allowed curves, * terminated by POLARSSL_ECP_DP_NONE. */ void ssl_set_curves( ssl_context *ssl, const ecp_group_id *curves ); #endif /* POLARSSL_SSL_SET_CURVES */ #if defined(POLARSSL_SSL_SERVER_NAME_INDICATION) /** * \brief Set hostname for ServerName TLS extension * (client-side only) * * * \param ssl SSL context * \param hostname the server hostname * * \return 0 if successful or POLARSSL_ERR_SSL_MALLOC_FAILED */ int ssl_set_hostname( ssl_context *ssl, const char *hostname ); /** * \brief Set server side ServerName TLS extension callback * (optional, server-side only). * * If set, the ServerName callback is called whenever the * server receives a ServerName TLS extension from the client * during a handshake. The ServerName callback has the * following parameters: (void *parameter, ssl_context *ssl, * const unsigned char *hostname, size_t len). If a suitable * certificate is found, the callback should set the * certificate and key to use with ssl_set_own_cert() (and * possibly adjust the CA chain as well) and return 0. The * callback should return -1 to abort the handshake at this * point. * * \param ssl SSL context * \param f_sni verification function * \param p_sni verification parameter */ void ssl_set_sni( ssl_context *ssl, int (*f_sni)(void *, ssl_context *, const unsigned char *, size_t), void *p_sni ); #endif /* POLARSSL_SSL_SERVER_NAME_INDICATION */ #if defined(POLARSSL_SSL_ALPN) /** * \brief Set the supported Application Layer Protocols. * * \param ssl SSL context * \param protos NULL-terminated list of supported protocols, * in decreasing preference order. * * \return 0 on success, or POLARSSL_ERR_SSL_BAD_INPUT_DATA. */ int ssl_set_alpn_protocols( ssl_context *ssl, const char **protos ); /** * \brief Get the name of the negotiated Application Layer Protocol. * This function should be called after the handshake is * completed. * * \param ssl SSL context * * \return Protcol name, or NULL if no protocol was negotiated. */ const char *ssl_get_alpn_protocol( const ssl_context *ssl ); #endif /* POLARSSL_SSL_ALPN */ /** * \brief Set the maximum supported version sent from the client side * and/or accepted at the server side * (Default: SSL_MAX_MAJOR_VERSION, SSL_MAX_MINOR_VERSION) * * Note: This ignores ciphersuites from 'higher' versions. * * \param ssl SSL context * \param major Major version number (only SSL_MAJOR_VERSION_3 supported) * \param minor Minor version number (SSL_MINOR_VERSION_0, * SSL_MINOR_VERSION_1 and SSL_MINOR_VERSION_2, * SSL_MINOR_VERSION_3 supported) * \return 0 on success or POLARSSL_ERR_SSL_BAD_INPUT_DATA * * \note With DTLS, use SSL_MINOR_VERSION_2 for DTLS 1.0 and * SSL_MINOR_VERSION_3 for DTLS 1.2 */ int ssl_set_max_version( ssl_context *ssl, int major, int minor ); /** * \brief Set the minimum accepted SSL/TLS protocol version * (Default: SSL_MIN_MAJOR_VERSION, SSL_MIN_MINOR_VERSION) * * \note Input outside of the SSL_MAX_XXXXX_VERSION and * SSL_MIN_XXXXX_VERSION range is ignored. * * \note SSL_MINOR_VERSION_0 (SSL v3) should be avoided. * * \param ssl SSL context * \param major Major version number (only SSL_MAJOR_VERSION_3 supported) * \param minor Minor version number (SSL_MINOR_VERSION_0, * SSL_MINOR_VERSION_1 and SSL_MINOR_VERSION_2, * SSL_MINOR_VERSION_3 supported) * \return 0 on success or POLARSSL_ERR_SSL_BAD_INPUT_DATA * * \note With DTLS, use SSL_MINOR_VERSION_2 for DTLS 1.0 and * SSL_MINOR_VERSION_3 for DTLS 1.2 */ int ssl_set_min_version( ssl_context *ssl, int major, int minor ); #if defined(POLARSSL_SSL_FALLBACK_SCSV) && defined(POLARSSL_SSL_CLI_C) /** * \brief Set the fallback flag (client-side only). * (Default: SSL_IS_NOT_FALLBACK). * * \note Set to SSL_IS_FALLBACK when preparing a fallback * connection, that is a connection with max_version set to a * lower value than the value you're willing to use. Such * fallback connections are not recommended but are sometimes * necessary to interoperate with buggy (version-intolerant) * servers. * * \warning You should NOT set this to SSL_IS_FALLBACK for * non-fallback connections! This would appear to work for a * while, then cause failures when the server is upgraded to * support a newer TLS version. * * \param ssl SSL context * \param fallback SSL_IS_NOT_FALLBACK or SSL_IS_FALLBACK */ void ssl_set_fallback( ssl_context *ssl, char fallback ); #endif /* POLARSSL_SSL_FALLBACK_SCSV && POLARSSL_SSL_CLI_C */ #if defined(POLARSSL_SSL_ENCRYPT_THEN_MAC) /** * \brief Enable or disable Encrypt-then-MAC * (Default: SSL_ETM_ENABLED) * * \note This should always be enabled, it is a security * improvement, and should not cause any interoperability * issue (used only if the peer supports it too). * * \param ssl SSL context * \param etm SSL_ETM_ENABLED or SSL_ETM_DISABLED */ void ssl_set_encrypt_then_mac( ssl_context *ssl, char etm ); #endif /* POLARSSL_SSL_ENCRYPT_THEN_MAC */ #if defined(POLARSSL_SSL_EXTENDED_MASTER_SECRET) /** * \brief Enable or disable Extended Master Secret negotiation. * (Default: SSL_EXTENDED_MS_ENABLED) * * \note This should always be enabled, it is a security fix to the * protocol, and should not cause any interoperability issue * (used only if the peer supports it too). * * \param ssl SSL context * \param ems SSL_EXTENDED_MS_ENABLED or SSL_EXTENDED_MS_DISABLED */ void ssl_set_extended_master_secret( ssl_context *ssl, char ems ); #endif /* POLARSSL_SSL_EXTENDED_MASTER_SECRET */ /** * \brief Disable or enable support for RC4 * (Default: SSL_ARC4_ENABLED) * * \note Though the default is RC4 for compatibility reasons in the * 1.3 branch, the recommended value is SSL_ARC4_DISABLED. * * \note This function will likely be removed in future versions as * RC4 will then be disabled by default at compile time. * * \param ssl SSL context * \param arc4 SSL_ARC4_ENABLED or SSL_ARC4_DISABLED */ void ssl_set_arc4_support( ssl_context *ssl, char arc4 ); #if defined(POLARSSL_SSL_MAX_FRAGMENT_LENGTH) /** * \brief Set the maximum fragment length to emit and/or negotiate * (Default: SSL_MAX_CONTENT_LEN, usually 2^14 bytes) * (Server: set maximum fragment length to emit, * usually negotiated by the client during handshake * (Client: set maximum fragment length to emit *and* * negotiate with the server during handshake) * * \param ssl SSL context * \param mfl_code Code for maximum fragment length (allowed values: * SSL_MAX_FRAG_LEN_512, SSL_MAX_FRAG_LEN_1024, * SSL_MAX_FRAG_LEN_2048, SSL_MAX_FRAG_LEN_4096) * * \return O if successful or POLARSSL_ERR_SSL_BAD_INPUT_DATA */ int ssl_set_max_frag_len( ssl_context *ssl, unsigned char mfl_code ); #endif /* POLARSSL_SSL_MAX_FRAGMENT_LENGTH */ #if defined(POLARSSL_SSL_TRUNCATED_HMAC) /** * \brief Activate negotiation of truncated HMAC * (Default: SSL_TRUNC_HMAC_DISABLED on client, * SSL_TRUNC_HMAC_ENABLED on server.) * * \param ssl SSL context * \param truncate Enable or disable (SSL_TRUNC_HMAC_ENABLED or * SSL_TRUNC_HMAC_DISABLED) * * \return Always 0. */ int ssl_set_truncated_hmac( ssl_context *ssl, int truncate ); #endif /* POLARSSL_SSL_TRUNCATED_HMAC */ #if defined(POLARSSL_SSL_CBC_RECORD_SPLITTING) /** * \brief Enable / Disable 1/n-1 record splitting * (Default: SSL_CBC_RECORD_SPLITTING_ENABLED) * * \note Only affects SSLv3 and TLS 1.0, not higher versions. * Does not affect non-CBC ciphersuites in any version. * * \param ssl SSL context * \param split SSL_CBC_RECORD_SPLITTING_ENABLED or * SSL_CBC_RECORD_SPLITTING_DISABLED */ void ssl_set_cbc_record_splitting( ssl_context *ssl, char split ); #endif /* POLARSSL_SSL_CBC_RECORD_SPLITTING */ #if defined(POLARSSL_SSL_SESSION_TICKETS) /** * \brief Enable / Disable session tickets * (Default: SSL_SESSION_TICKETS_ENABLED on client, * SSL_SESSION_TICKETS_DISABLED on server) * * \note On server, ssl_set_rng() must be called before this function * to allow generating the ticket encryption and * authentication keys. * * \param ssl SSL context * \param use_tickets Enable or disable (SSL_SESSION_TICKETS_ENABLED or * SSL_SESSION_TICKETS_DISABLED) * * \return O if successful, * or a specific error code (server only). */ int ssl_set_session_tickets( ssl_context *ssl, int use_tickets ); /** * \brief Set session ticket lifetime (server only) * (Default: SSL_DEFAULT_TICKET_LIFETIME (86400 secs / 1 day)) * * \param ssl SSL context * \param lifetime session ticket lifetime */ void ssl_set_session_ticket_lifetime( ssl_context *ssl, int lifetime ); #endif /* POLARSSL_SSL_SESSION_TICKETS */ #if defined(POLARSSL_SSL_RENEGOTIATION) /** * \brief Enable / Disable renegotiation support for connection when * initiated by peer * (Default: SSL_RENEGOTIATION_DISABLED) * * Note: A server with support enabled is more vulnerable for a * resource DoS by a malicious client. You should enable this on * a client to enable server-initiated renegotiation. * * \param ssl SSL context * \param renegotiation Enable or disable (SSL_RENEGOTIATION_ENABLED or * SSL_RENEGOTIATION_DISABLED) */ void ssl_set_renegotiation( ssl_context *ssl, int renegotiation ); #endif /* POLARSSL_SSL_RENEGOTIATION */ /** * \brief Prevent or allow legacy renegotiation. * (Default: SSL_LEGACY_NO_RENEGOTIATION) * * SSL_LEGACY_NO_RENEGOTIATION allows connections to * be established even if the peer does not support * secure renegotiation, but does not allow renegotiation * to take place if not secure. * (Interoperable and secure option) * * SSL_LEGACY_ALLOW_RENEGOTIATION allows renegotiations * with non-upgraded peers. Allowing legacy renegotiation * makes the connection vulnerable to specific man in the * middle attacks. (See RFC 5746) * (Most interoperable and least secure option) * * SSL_LEGACY_BREAK_HANDSHAKE breaks off connections * if peer does not support secure renegotiation. Results * in interoperability issues with non-upgraded peers * that do not support renegotiation altogether. * (Most secure option, interoperability issues) * * \param ssl SSL context * \param allow_legacy Prevent or allow (SSL_NO_LEGACY_RENEGOTIATION, * SSL_ALLOW_LEGACY_RENEGOTIATION or * SSL_LEGACY_BREAK_HANDSHAKE) */ void ssl_legacy_renegotiation( ssl_context *ssl, int allow_legacy ); #if defined(POLARSSL_SSL_RENEGOTIATION) /** * \brief Enforce renegotiation requests. * (Default: enforced, max_records = 16) * * When we request a renegotiation, the peer can comply or * ignore the request. This function allows us to decide * whether to enforce our renegotiation requests by closing * the connection if the peer doesn't comply. * * However, records could already be in transit from the peer * when the request is emitted. In order to increase * reliability, we can accept a number of records before the * expected handshake records. * * The optimal value is highly dependent on the specific usage * scenario. * * \note With DTLS and server-initiated renegotiation, the * HelloRequest is retransmited every time ssl_read() times * out or receives Application Data, until: * - max_records records have beens seen, if it is >= 0, or * - the number of retransmits that would happen during an * actual handshake has been reached. * Please remember the request might be lost a few times * if you consider setting max_records to a really low value. * * \warning On client, the grace period can only happen during * ssl_read(), as opposed to ssl_write() and ssl_renegotiate() * which always behave as if max_record was 0. The reason is, * if we receive application data from the server, we need a * place to write it, which only happens during ssl_read(). * * \param ssl SSL context * \param max_records Use SSL_RENEGOTIATION_NOT_ENFORCED if you don't want to * enforce renegotiation, or a non-negative value to enforce * it but allow for a grace period of max_records records. */ void ssl_set_renegotiation_enforced( ssl_context *ssl, int max_records ); /** * \brief Set record counter threshold for periodic renegotiation. * (Default: 2^64 - 256.) * * Renegotiation is automatically triggered when a record * counter (outgoing or ingoing) crosses the defined * threshold. The default value is meant to prevent the * connection from being closed when the counter is about to * reached its maximal value (it is not allowed to wrap). * * Lower values can be used to enforce policies such as "keys * must be refreshed every N packets with cipher X". * * \param ssl SSL context * \param period The threshold value: a big-endian 64-bit number. * Set to 2^64 - 1 to disable periodic renegotiation */ void ssl_set_renegotiation_period( ssl_context *ssl, const unsigned char period[8] ); #endif /* POLARSSL_SSL_RENEGOTIATION */ /** * \brief Return the number of data bytes available to read * * \param ssl SSL context * * \return how many bytes are available in the read buffer */ size_t ssl_get_bytes_avail( const ssl_context *ssl ); /** * \brief Return the result of the certificate verification * * \param ssl SSL context * * \return 0 if successful, * -1 if result is not available (eg because the handshake was * aborted too early), or * a combination of BADCERT_xxx and BADCRL_xxx flags, see * x509.h */ int ssl_get_verify_result( const ssl_context *ssl ); /** * \brief Return the name of the current ciphersuite * * \param ssl SSL context * * \return a string containing the ciphersuite name */ const char *ssl_get_ciphersuite( const ssl_context *ssl ); /** * \brief Return the current SSL version (SSLv3/TLSv1/etc) * * \param ssl SSL context * * \return a string containing the SSL version */ const char *ssl_get_version( const ssl_context *ssl ); /** * \brief Return the (maximum) number of bytes added by the record * layer: header + encryption/MAC overhead (inc. padding) * * \param ssl SSL context * * \return Current maximum record expansion in bytes, or * POLARSSL_ERR_FEATURE_UNAVAILABLE if compression is enabled, * which makes expansion much less predictable */ int ssl_get_record_expansion( const ssl_context *ssl ); #if defined(POLARSSL_X509_CRT_PARSE_C) /** * \brief Return the peer certificate from the current connection * * Note: Can be NULL in case no certificate was sent during * the handshake. Different calls for the same connection can * return the same or different pointers for the same * certificate and even a different certificate altogether. * The peer cert CAN change in a single connection if * renegotiation is performed. * * \param ssl SSL context * * \return the current peer certificate */ const x509_crt *ssl_get_peer_cert( const ssl_context *ssl ); #endif /* POLARSSL_X509_CRT_PARSE_C */ #if defined(POLARSSL_SSL_CLI_C) /** * \brief Save session in order to resume it later (client-side only) * Session data is copied to presented session structure. * * \warning Currently, peer certificate is lost in the operation. * * \param ssl SSL context * \param session session context * * \return 0 if successful, * POLARSSL_ERR_SSL_MALLOC_FAILED if memory allocation failed, * POLARSSL_ERR_SSL_BAD_INPUT_DATA if used server-side or * arguments are otherwise invalid * * \sa ssl_set_session() */ int ssl_get_session( const ssl_context *ssl, ssl_session *session ); #endif /* POLARSSL_SSL_CLI_C */ /** * \brief Perform the SSL handshake * * \param ssl SSL context * * \return 0 if successful, POLARSSL_ERR_NET_WANT_READ, * POLARSSL_ERR_NET_WANT_WRITE, or a specific SSL error code. */ int ssl_handshake( ssl_context *ssl ); /** * \brief Perform a single step of the SSL handshake * * Note: the state of the context (ssl->state) will be at * the following state after execution of this function. * Do not call this function if state is SSL_HANDSHAKE_OVER. * * \param ssl SSL context * * \return 0 if successful, POLARSSL_ERR_NET_WANT_READ, * POLARSSL_ERR_NET_WANT_WRITE, or a specific SSL error code. */ int ssl_handshake_step( ssl_context *ssl ); #if defined(POLARSSL_SSL_RENEGOTIATION) /** * \brief Initiate an SSL renegotiation on the running connection. * Client: perform the renegotiation right now. * Server: request renegotiation, which will be performed * during the next call to ssl_read() if honored by client. * * \param ssl SSL context * * \return 0 if successful, or any ssl_handshake() return value. */ int ssl_renegotiate( ssl_context *ssl ); #endif /* POLARSSL_SSL_RENEGOTIATION */ /** * \brief Read at most 'len' application data bytes * * \param ssl SSL context * \param buf buffer that will hold the data * \param len maximum number of bytes to read * * \return This function returns the number of bytes read, 0 for EOF, * or a negative error code. */ int ssl_read( ssl_context *ssl, unsigned char *buf, size_t len ); /** * \brief Write exactly 'len' application data bytes * * \param ssl SSL context * \param buf buffer holding the data * \param len how many bytes must be written * * \return This function returns the number of bytes written, * or a negative error code. * * \note When this function returns POLARSSL_ERR_NET_WANT_WRITE, * it must be called later with the *same* arguments, * until it returns a positive value. * * \note If the requested length is greater than the maximum * fragment length (either the built-in limit or the one set * or negotiated with the peer), then: * - with TLS, less bytes than requested are written. (In * order to write larger messages, this function should be * called in a loop.) * - with DTLS, POLARSSL_ERR_SSL_BAD_INPUT_DATA is returned. */ int ssl_write( ssl_context *ssl, const unsigned char *buf, size_t len ); /** * \brief Send an alert message * * \param ssl SSL context * \param level The alert level of the message * (SSL_ALERT_LEVEL_WARNING or SSL_ALERT_LEVEL_FATAL) * \param message The alert message (SSL_ALERT_MSG_*) * * \return 0 if successful, or a specific SSL error code. */ int ssl_send_alert_message( ssl_context *ssl, unsigned char level, unsigned char message ); /** * \brief Notify the peer that the connection is being closed * * \param ssl SSL context */ int ssl_close_notify( ssl_context *ssl ); /** * \brief Free referenced items in an SSL context and clear memory * * \param ssl SSL context */ void ssl_free( ssl_context *ssl ); /** * \brief Initialize SSL session structure * * \param session SSL session */ void ssl_session_init( ssl_session *session ); /** * \brief Free referenced items in an SSL session including the * peer certificate and clear memory * * \param session SSL session */ void ssl_session_free( ssl_session *session ); /** * \brief Free referenced items in an SSL transform context and clear * memory * * \param transform SSL transform context */ void ssl_transform_free( ssl_transform *transform ); /** * \brief Free referenced items in an SSL handshake context and clear * memory * * \param handshake SSL handshake context */ void ssl_handshake_free( ssl_handshake_params *handshake ); /* * Internal functions (do not call directly) */ int ssl_handshake_client_step( ssl_context *ssl ); int ssl_handshake_server_step( ssl_context *ssl ); void ssl_handshake_wrapup( ssl_context *ssl ); int ssl_send_fatal_handshake_failure( ssl_context *ssl ); void ssl_reset_checksum( ssl_context *ssl ); int ssl_derive_keys( ssl_context *ssl ); int ssl_read_record( ssl_context *ssl ); int ssl_fetch_input( ssl_context *ssl, size_t nb_want ); int ssl_write_record( ssl_context *ssl ); int ssl_flush_output( ssl_context *ssl ); int ssl_parse_certificate( ssl_context *ssl ); int ssl_write_certificate( ssl_context *ssl ); int ssl_parse_change_cipher_spec( ssl_context *ssl ); int ssl_write_change_cipher_spec( ssl_context *ssl ); int ssl_parse_finished( ssl_context *ssl ); int ssl_write_finished( ssl_context *ssl ); void ssl_optimize_checksum( ssl_context *ssl, const ssl_ciphersuite_t *ciphersuite_info ); #if defined(POLARSSL_KEY_EXCHANGE__SOME__PSK_ENABLED) int ssl_psk_derive_premaster( ssl_context *ssl, key_exchange_type_t key_ex ); #endif #if defined(POLARSSL_PK_C) unsigned char ssl_sig_from_pk( pk_context *pk ); pk_type_t ssl_pk_alg_from_sig( unsigned char sig ); #endif md_type_t ssl_md_alg_from_hash( unsigned char hash ); #if defined(POLARSSL_SSL_SET_CURVES) int ssl_curve_is_acceptable( const ssl_context *ssl, ecp_group_id grp_id ); #endif #if defined(POLARSSL_X509_CRT_PARSE_C) static inline pk_context *ssl_own_key( ssl_context *ssl ) { return( ssl->handshake->key_cert == NULL ? NULL : ssl->handshake->key_cert->key ); } static inline x509_crt *ssl_own_cert( ssl_context *ssl ) { return( ssl->handshake->key_cert == NULL ? NULL : ssl->handshake->key_cert->cert ); } /* * Check usage of a certificate wrt extensions: * keyUsage, extendedKeyUsage (later), and nSCertType (later). * * Warning: cert_endpoint is the endpoint of the cert (ie, of our peer when we * check a cert we received from them)! * * Return 0 if everything is OK, -1 if not. */ int ssl_check_cert_usage( const x509_crt *cert, const ssl_ciphersuite_t *ciphersuite, int cert_endpoint ); #endif /* POLARSSL_X509_CRT_PARSE_C */ void ssl_write_version( int major, int minor, int transport, unsigned char ver[2] ); void ssl_read_version( int *major, int *minor, int transport, const unsigned char ver[2] ); static inline size_t ssl_hdr_len( const ssl_context *ssl ) { #if defined(POLARSSL_SSL_PROTO_DTLS) if( ssl->transport == SSL_TRANSPORT_DATAGRAM ) return( 13 ); #else ((void) ssl); #endif return( 5 ); } static inline size_t ssl_hs_hdr_len( const ssl_context *ssl ) { #if defined(POLARSSL_SSL_PROTO_DTLS) if( ssl->transport == SSL_TRANSPORT_DATAGRAM ) return( 12 ); #else ((void) ssl); #endif return( 4 ); } #if defined(POLARSSL_SSL_PROTO_DTLS) void ssl_send_flight_completed( ssl_context *ssl ); void ssl_recv_flight_completed( ssl_context *ssl ); int ssl_resend( ssl_context *ssl ); #endif /* Visible for testing purposes only */ #if defined(POLARSSL_SSL_DTLS_ANTI_REPLAY) int ssl_dtls_replay_check( ssl_context *ssl ); void ssl_dtls_replay_update( ssl_context *ssl ); #endif /* constant-time buffer comparison */ static inline int safer_memcmp( const void *a, const void *b, size_t n ) { size_t i; const unsigned char *A = (const unsigned char *) a; const unsigned char *B = (const unsigned char *) b; unsigned char diff = 0; for( i = 0; i < n; i++ ) diff |= A[i] ^ B[i]; return( diff ); } #ifdef __cplusplus } #endif #endif /* ssl.h */