/* * Copyright (C) 2000-2016 Free Software Foundation, Inc. * Copyright (C) 2015-2018 Red Hat, Inc. * * Author: Nikos Mavrogiannopoulos * * This file is part of GnuTLS. * * The GnuTLS is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public License * as published by the Free Software Foundation; either version 2.1 of * the License, or (at your option) any later version. * * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this program. If not, see * */ #ifndef GNUTLS_LIB_GNUTLS_INT_H #define GNUTLS_LIB_GNUTLS_INT_H #ifdef HAVE_CONFIG_H #include #endif #include #include #include #include #include #include #include #include #include #ifdef NO_SSIZE_T #define HAVE_SSIZE_T typedef int ssize_t; #endif #include #include #include #if HAVE_SYS_SOCKET_H #include #elif HAVE_WS2TCPIP_H #include #endif #include #include #include "attribute.h" #define ENABLE_ALIGN16 #ifdef __clang_major # define _GNUTLS_CLANG_VERSION (__clang_major__ * 10000 + __clang_minor__ * 100 + __clang_patchlevel__) #else # define _GNUTLS_CLANG_VERSION 0 #endif /* clang also defines __GNUC__. It promotes a GCC version of 4.2.1. */ #ifdef __GNUC__ # define _GNUTLS_GCC_VERSION (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) #endif #if _GNUTLS_GCC_VERSION >= 30100 # define likely(x) __builtin_expect((x), 1) # define unlikely(x) __builtin_expect((x), 0) #else # define likely # define unlikely #endif #include #include #include #include #include /* in case we compile with system headers taking priority, we * make sure that some new attributes are still available. */ #ifndef __GNUTLS_CONST__ # define __GNUTLS_CONST__ #endif /* The size of a handshake message should not * be larger than this value. */ #define MAX_HANDSHAKE_PACKET_SIZE 128*1024 #define GNUTLS_DEF_SESSION_ID_SIZE 32 /* The maximum digest size of hash algorithms. */ #define MAX_FILENAME 512 #define MAX_HASH_SIZE 64 #define MAX_MAC_KEY_SIZE 64 #define MAX_CIPHER_BLOCK_SIZE 64 /* CHACHA20 */ #define MAX_CIPHER_KEY_SIZE 32 #define MAX_CIPHER_IV_SIZE 16 #define MAX_USERNAME_SIZE 128 #define MAX_SERVER_NAME_SIZE 256 #define AEAD_EXPLICIT_DATA_SIZE 8 #define AEAD_IMPLICIT_DATA_SIZE 4 #define GNUTLS_MASTER_SIZE 48 #define GNUTLS_RANDOM_SIZE 32 /* Under TLS1.3 a hello retry request is sent as server hello */ #define REAL_HSK_TYPE(t) ((t)==GNUTLS_HANDSHAKE_HELLO_RETRY_REQUEST?GNUTLS_HANDSHAKE_SERVER_HELLO:t) /* DTLS */ #define DTLS_RETRANS_TIMEOUT 1000 /* TLS Extensions */ /* we can receive up to MAX_EXT_TYPES extensions. */ #define MAX_EXT_TYPES 64 /* TLS-internal extension (will be parsed after a ciphersuite is selected). * This amends the gnutls_ext_parse_type_t. Not exported yet to allow more refining * prior to finalizing an API. */ #define _GNUTLS_EXT_TLS_POST_CS 177 /* expire time for resuming sessions */ #define DEFAULT_EXPIRE_TIME 21600 #define STEK_ROTATION_PERIOD_PRODUCT 3 #define DEFAULT_HANDSHAKE_TIMEOUT_MS 40*1000 /* The EC group to be used when the extension * supported groups/curves is not present */ #define DEFAULT_EC_GROUP GNUTLS_GROUP_SECP256R1 typedef enum transport_t { GNUTLS_STREAM, GNUTLS_DGRAM } transport_t; /* The TLS 1.3 stage of handshake */ typedef enum hs_stage_t { STAGE_HS, STAGE_APP, STAGE_UPD_OURS, STAGE_UPD_PEERS, STAGE_EARLY } hs_stage_t; typedef enum record_send_state_t { RECORD_SEND_NORMAL = 0, RECORD_SEND_CORKED, /* corked and transition to NORMAL afterwards */ RECORD_SEND_CORKED_TO_KU, /* corked but must transition to RECORD_SEND_KEY_UPDATE_1 */ RECORD_SEND_KEY_UPDATE_1, RECORD_SEND_KEY_UPDATE_2, RECORD_SEND_KEY_UPDATE_3 } record_send_state_t; /* The mode check occurs a lot throughout GnuTLS and can be replaced by * the following shorter macro. Also easier to update one macro * in the future when the internal structure changes than all the conditionals * itself. */ #define IS_SERVER(session) (session->security_parameters.entity == GNUTLS_SERVER) /* To check whether we have a DTLS session */ #define IS_DTLS(session) (session->internals.transport == GNUTLS_DGRAM) /* the maximum size of encrypted packets */ #define DEFAULT_MAX_RECORD_SIZE 16384 #define DEFAULT_MAX_EARLY_DATA_SIZE 16384 #define TLS_RECORD_HEADER_SIZE 5 #define DTLS_RECORD_HEADER_SIZE (TLS_RECORD_HEADER_SIZE+8) #define RECORD_HEADER_SIZE(session) (IS_DTLS(session) ? DTLS_RECORD_HEADER_SIZE : TLS_RECORD_HEADER_SIZE) #define MAX_RECORD_HEADER_SIZE DTLS_RECORD_HEADER_SIZE #define MIN_RECORD_SIZE 512 #define MIN_RECORD_SIZE_SMALL 64 /* The following macro is used to calculate the overhead when sending. * when receiving we use a different way as there are implementations that * store more data than allowed. */ #define MAX_RECORD_SEND_OVERHEAD(session) (MAX_CIPHER_BLOCK_SIZE/*iv*/+MAX_PAD_SIZE+MAX_HASH_SIZE/*MAC*/) #define MAX_RECORD_SEND_SIZE(session) (IS_DTLS(session)? \ (MIN((size_t)gnutls_dtls_get_mtu(session), (size_t)session->security_parameters.max_record_send_size+MAX_RECORD_SEND_OVERHEAD(session))): \ ((size_t)session->security_parameters.max_record_send_size+MAX_RECORD_SEND_OVERHEAD(session))) #define MAX_PAD_SIZE 255 #define EXTRA_COMP_SIZE 2048 #define TLS_HANDSHAKE_HEADER_SIZE 4 #define DTLS_HANDSHAKE_HEADER_SIZE (TLS_HANDSHAKE_HEADER_SIZE+8) #define HANDSHAKE_HEADER_SIZE(session) (IS_DTLS(session) ? DTLS_HANDSHAKE_HEADER_SIZE : TLS_HANDSHAKE_HEADER_SIZE) #define MAX_HANDSHAKE_HEADER_SIZE DTLS_HANDSHAKE_HEADER_SIZE /* Maximum seed size for provable parameters */ #define MAX_PVP_SEED_SIZE 256 /* This is the maximum handshake message size we send without fragmentation. This currently ignores record layer overhead. */ #define DTLS_DEFAULT_MTU 1200 /* the maximum size of the DTLS cookie */ #define DTLS_MAX_COOKIE_SIZE 32 /* The maximum number of HELLO_VERIFY_REQUEST messages the client processes before aborting. */ #define MAX_HANDSHAKE_HELLO_VERIFY_REQUESTS 5 #define MAX_PK_PARAM_SIZE 2048 /* defaults for verification functions */ #define DEFAULT_MAX_VERIFY_DEPTH 16 #define DEFAULT_MAX_VERIFY_BITS (MAX_PK_PARAM_SIZE*8) #define MAX_VERIFY_DEPTH 4096 #include #define MEMSUB(x,y) ((ssize_t)((ptrdiff_t)x-(ptrdiff_t)y)) #define DECR_LEN(len, x) DECR_LENGTH_RET(len, x, GNUTLS_E_UNEXPECTED_PACKET_LENGTH) #define DECR_LEN_FINAL(len, x) do { \ if (len != x) \ return gnutls_assert_val(GNUTLS_E_UNEXPECTED_PACKET_LENGTH); \ else \ len = 0; \ } while (0) #define DECR_LENGTH_RET(len, x, RET) DECR_LENGTH_COM(len, x, return RET) #define DECR_LENGTH_COM(len, x, COM) do { if (len typedef enum handshake_state_t { STATE0 = 0, STATE1, STATE2, STATE3, STATE4, STATE5, STATE6, STATE7, STATE8, STATE9, STATE10, STATE11, STATE12, STATE13, STATE14, STATE15, STATE16, STATE17, STATE18, STATE19, STATE20 = 20, STATE21, STATE22, STATE30 = 30, STATE31, STATE40 = 40, STATE41, STATE50 = 50, STATE90=90, STATE91, STATE92, STATE93, STATE94, STATE99=99, STATE100=100, STATE101, STATE102, STATE103, STATE104, STATE105, STATE106, STATE107, STATE108, STATE109, STATE110, STATE111, STATE112, STATE113, STATE114, STATE115, STATE150 /* key update */ } handshake_state_t; typedef enum bye_state_t { BYE_STATE0 = 0, BYE_STATE1, BYE_STATE2 } bye_state_t; typedef enum send_ticket_state_t { TICKET_STATE0 = 0, TICKET_STATE1 } send_ticket_state_t; typedef enum reauth_state_t { REAUTH_STATE0 = 0, REAUTH_STATE1, REAUTH_STATE2, REAUTH_STATE3, REAUTH_STATE4, REAUTH_STATE5 } reauth_state_t; #define TICKET_STATE session->internals.ticket_state #define BYE_STATE session->internals.bye_state #define REAUTH_STATE session->internals.reauth_state typedef enum heartbeat_state_t { SHB_SEND1 = 0, SHB_SEND2, SHB_RECV } heartbeat_state_t; typedef enum recv_state_t { RECV_STATE_0 = 0, RECV_STATE_DTLS_RETRANSMIT, /* client-side false start state */ RECV_STATE_FALSE_START_HANDLING, /* we are calling gnutls_handshake() within record_recv() */ RECV_STATE_FALSE_START, /* gnutls_record_recv() should complete the handshake */ /* async handshake msg state */ RECV_STATE_ASYNC_HANDSHAKE, /* an incomplete async handshake message was seen */ /* server-side early start under TLS1.3; enabled when no client cert is received */ RECV_STATE_EARLY_START_HANDLING, /* we are calling gnutls_handshake() within record_recv() */ RECV_STATE_EARLY_START, /* gnutls_record_recv() should complete the handshake */ RECV_STATE_REHANDSHAKE, /* gnutls_record_recv() should complete any incoming re-handshake requests */ RECV_STATE_REAUTH /* gnutls_record_recv() should complete any incoming reauthentication requests */ } recv_state_t; #include "str.h" /* This is the maximum number of algorithms (ciphers or macs etc). * keep it synced with GNUTLS_MAX_ALGORITHM_NUM in gnutls.h */ #define MAX_ALGOS GNUTLS_MAX_ALGORITHM_NUM /* IDs are allocated in a way that all values fit in 64-bit integer as (1< verify(GNUTLS_EXTENSION_MAX < GNUTLS_EXTENSION_MAX_VALUE); verify(GNUTLS_EXTENSION_MAX < MAX_EXT_TYPES); /* we must provide at least 16 extensions for users to register; * increase GNUTLS_EXTENSION_MAX_VALUE, MAX_EXT_TYPES and used_exts * type if this fails */ verify(GNUTLS_EXTENSION_MAX_VALUE - GNUTLS_EXTENSION_MAX >= 16); /* The 'verify' symbol from is used extensively in the * code; undef it to avoid clash */ #undef verify typedef enum { CIPHER_STREAM, CIPHER_BLOCK, CIPHER_AEAD } cipher_type_t; #define RESUME_TRUE 1 #define RESUME_FALSE 0 /* Record Protocol */ typedef enum content_type_t { GNUTLS_CHANGE_CIPHER_SPEC = 20, GNUTLS_ALERT, GNUTLS_HANDSHAKE, GNUTLS_APPLICATION_DATA, GNUTLS_HEARTBEAT } content_type_t; #define GNUTLS_PK_ANY (gnutls_pk_algorithm_t)-1 #define GNUTLS_PK_NONE (gnutls_pk_algorithm_t)-2 #define GNUTLS_PK_IS_RSA(pk) ((pk) == GNUTLS_PK_RSA || (pk) == GNUTLS_PK_RSA_PSS) /* Message buffers (mbuffers) structures */ /* this is actually the maximum number of distinct handshake * messages that can arrive in a single flight */ #define MAX_HANDSHAKE_MSGS 6 typedef struct { /* Handshake layer type and sequence of message */ gnutls_handshake_description_t htype; /* The "real" type received; that is, it does not distinguish * HRR from server hello, while htype does */ gnutls_handshake_description_t rtype; uint32_t length; /* valid in DTLS */ uint16_t sequence; /* indicate whether that message is complete. * complete means start_offset == 0 and end_offset == length */ uint32_t start_offset; uint32_t end_offset; uint8_t header[MAX_HANDSHAKE_HEADER_SIZE]; int header_size; gnutls_buffer_st data; } handshake_buffer_st; typedef struct mbuffer_st { /* when used in mbuffer_head_st */ struct mbuffer_st *next; struct mbuffer_st *prev; /* msg->size - mark = number of bytes left to process in this message. Mark should only be non-zero when this buffer is the head of the queue. */ size_t mark; /* the data */ gnutls_datum_t msg; size_t maximum_size; /* used during fill in, to separate header from data * body. */ unsigned int uhead_mark; /* Filled in by record layer on recv: * type, record_sequence */ /* record layer content type */ content_type_t type; /* record layer sequence */ uint64_t record_sequence; /* Filled in by handshake layer on send: * type, epoch, htype, handshake_sequence */ /* Record layer epoch of message */ uint16_t epoch; /* Handshake layer type and sequence of message */ gnutls_handshake_description_t htype; uint16_t handshake_sequence; } mbuffer_st; typedef struct mbuffer_head_st { mbuffer_st *head; mbuffer_st *tail; unsigned int length; size_t byte_length; } mbuffer_head_st; /* Store & Retrieve functions defines: */ typedef struct auth_cred_st { gnutls_credentials_type_t algorithm; /* the type of credentials depends on algorithm */ void *credentials; struct auth_cred_st *next; } auth_cred_st; /* session ticket definitions */ #define TICKET_MASTER_KEY_SIZE (TICKET_KEY_NAME_SIZE+TICKET_CIPHER_KEY_SIZE+TICKET_MAC_SECRET_SIZE) #define TICKET_KEY_NAME_SIZE 16 #define TICKET_CIPHER_KEY_SIZE 32 #define TICKET_MAC_SECRET_SIZE 16 /* These are restricted by TICKET_CIPHER_KEY_SIZE and TICKET_MAC_SECRET_SIZE */ #define TICKET_CIPHER GNUTLS_CIPHER_AES_256_CBC #define TICKET_IV_SIZE 16 #define TICKET_BLOCK_SIZE 16 #define TICKET_MAC_ALGO GNUTLS_MAC_SHA1 #define TICKET_MAC_SIZE 20 /* HMAC-SHA1 */ struct ticket_st { uint8_t key_name[TICKET_KEY_NAME_SIZE]; uint8_t IV[TICKET_IV_SIZE]; uint8_t *encrypted_state; uint16_t encrypted_state_len; uint8_t mac[TICKET_MAC_SIZE]; }; struct binder_data_st { const struct mac_entry_st *prf; /* non-null if this struct is set */ gnutls_datum_t psk; /* 0-based index of the selected PSK. * This only applies if the HSK_PSK_SELECTED flag is set in internals.hsk_flags, * which signals a PSK has indeed been selected. */ uint8_t idx; uint8_t resumption; /* whether it is a resumption binder */ }; typedef void (* gnutls_stek_rotation_callback_t) (const gnutls_datum_t *prev_key, const gnutls_datum_t *new_key, uint64_t t); struct gnutls_key_st { struct { /* These are kept outside the TLS1.3 union as they are * negotiated via extension, even before protocol is negotiated */ gnutls_pk_params_st ecdh_params; gnutls_pk_params_st ecdhx_params; gnutls_pk_params_st dh_params; } kshare; /* The union contents depend on the negotiated protocol. * It should not contain any values which are allocated * prior to protocol negotiation, as it would be impossible * to deinitialize. */ union { struct { /* the current (depending on state) secret, can be * early_secret, client_early_traffic_secret, ... */ uint8_t temp_secret[MAX_HASH_SIZE]; unsigned temp_secret_size; /* depends on negotiated PRF size */ uint8_t e_ckey[MAX_HASH_SIZE]; /* client_early_traffic_secret */ uint8_t hs_ckey[MAX_HASH_SIZE]; /* client_hs_traffic_secret */ uint8_t hs_skey[MAX_HASH_SIZE]; /* server_hs_traffic_secret */ uint8_t ap_ckey[MAX_HASH_SIZE]; /* client_ap_traffic_secret */ uint8_t ap_skey[MAX_HASH_SIZE]; /* server_ap_traffic_secret */ uint8_t ap_expkey[MAX_HASH_SIZE]; /* {early_,}exporter_master_secret */ uint8_t ap_rms[MAX_HASH_SIZE]; /* resumption_master_secret */ } tls13; /* tls1.3 */ /* Folow the SSL3.0 and TLS1.2 key exchanges */ struct { /* For ECDH KX */ struct { gnutls_pk_params_st params; /* private part */ /* public part */ bigint_t x; bigint_t y; gnutls_datum_t raw; /* public key used in ECDHX (point) */ } ecdh; /* For DH KX */ struct { gnutls_pk_params_st params; bigint_t client_Y; } dh; /* for SRP KX */ struct { bigint_t srp_key; bigint_t srp_g; bigint_t srp_p; bigint_t A; bigint_t B; bigint_t u; bigint_t b; bigint_t a; bigint_t x; } srp; } tls12; /* from ssl3.0 to tls12 */ } proto; /* binders / pre-shared keys in use; temporary storage. * On client side it will hold data for the resumption and external * PSKs After server hello is received the selected binder is set on 0 position * and HSK_PSK_SELECTED is set. * * On server side the first value is populated with * the selected PSK data if HSK_PSK_SELECTED flag is set. */ struct binder_data_st binders[2]; /* TLS pre-master key; applies to 1.2 and 1.3 */ gnutls_datum_t key; uint8_t /* The key to encrypt and decrypt session tickets */ session_ticket_key[TICKET_MASTER_KEY_SIZE], /* Static buffer for the previous key, whenever we need it */ previous_ticket_key[TICKET_MASTER_KEY_SIZE], /* Initial key supplied by the caller */ initial_stek[TICKET_MASTER_KEY_SIZE]; /* this is used to hold the peers authentication data */ /* auth_info_t structures SHOULD NOT contain malloced * elements. Check gnutls_session_pack.c, and gnutls_auth.c. * Remember that this should be calloced! */ void *auth_info; gnutls_credentials_type_t auth_info_type; int auth_info_size; /* needed in order to store to db for restoring */ auth_cred_st *cred; /* used to specify keys/certificates etc */ struct { uint64_t last_result; uint8_t was_rotated; gnutls_stek_rotation_callback_t cb; } totp; }; typedef struct gnutls_key_st gnutls_key_st; struct pin_info_st { gnutls_pin_callback_t cb; void *data; }; struct record_state_st; typedef struct record_state_st record_state_st; struct record_parameters_st; typedef struct record_parameters_st record_parameters_st; #define GNUTLS_CIPHER_FLAG_ONLY_AEAD (1 << 0) /* When set, this cipher is only available through the new AEAD API */ #define GNUTLS_CIPHER_FLAG_XOR_NONCE (1 << 1) /* In this TLS AEAD cipher xor the implicit_iv with the nonce */ #define GNUTLS_CIPHER_FLAG_NO_REKEY (1 << 2) /* whether this tls1.3 cipher doesn't need to rekey after 2^24 messages */ /* cipher and mac parameters */ typedef struct cipher_entry_st { const char *name; gnutls_cipher_algorithm_t id; uint16_t blocksize; uint16_t keysize; cipher_type_t type; uint16_t implicit_iv; /* the size of implicit IV - the IV generated but not sent */ uint16_t explicit_iv; /* the size of explicit IV - the IV stored in record */ uint16_t cipher_iv; /* the size of IV needed by the cipher */ uint16_t tagsize; unsigned flags; } cipher_entry_st; typedef struct gnutls_cipher_suite_entry_st { const char *name; const uint8_t id[2]; gnutls_cipher_algorithm_t block_algorithm; gnutls_kx_algorithm_t kx_algorithm; gnutls_mac_algorithm_t mac_algorithm; gnutls_protocol_t min_version; /* this cipher suite is supported * from 'version' and above; */ gnutls_protocol_t max_version; /* this cipher suite is not supported * after 'version' and above; */ gnutls_protocol_t min_dtls_version; /* DTLS min version */ gnutls_protocol_t max_dtls_version; /* DTLS max version */ gnutls_mac_algorithm_t prf; } gnutls_cipher_suite_entry_st; typedef struct gnutls_group_entry_st { const char *name; gnutls_group_t id; const gnutls_datum_t *prime; const gnutls_datum_t *q; const gnutls_datum_t *generator; const unsigned *q_bits; gnutls_ecc_curve_t curve; gnutls_pk_algorithm_t pk; unsigned tls_id; /* The RFC4492 namedCurve ID or TLS 1.3 group ID */ } gnutls_group_entry_st; #define GNUTLS_MAC_FLAG_PREIMAGE_INSECURE 1 /* if this algorithm should not be trusted for pre-image attacks */ #define GNUTLS_MAC_FLAG_CONTINUOUS_MAC (1 << 1) /* if this MAC should be used in a 'continuous' way in TLS */ /* This structure is used both for MACs and digests */ typedef struct mac_entry_st { const char *name; const char *oid; /* OID of the hash - if it is a hash */ const char *mac_oid; /* OID of the MAC algorithm - if it is a MAC */ gnutls_mac_algorithm_t id; unsigned output_size; unsigned key_size; unsigned nonce_size; unsigned placeholder; /* if set, then not a real MAC */ unsigned block_size; /* internal block size for HMAC */ unsigned flags; } mac_entry_st; typedef struct { const char *name; gnutls_protocol_t id; /* gnutls internal version number */ unsigned age; /* internal ordering by protocol age */ uint8_t major; /* defined by the protocol */ uint8_t minor; /* defined by the protocol */ transport_t transport; /* Type of transport, stream or datagram */ bool supported; /* 0 not supported, > 0 is supported */ bool explicit_iv; bool extensions; /* whether it supports extensions */ bool selectable_sighash; /* whether signatures can be selected */ bool selectable_prf; /* whether the PRF is ciphersuite-defined */ /* if SSL3 is disabled this flag indicates that this protocol is a placeholder, * otherwise it prevents this protocol from being set as record version */ bool obsolete; bool tls13_sem; /* The TLS 1.3 handshake semantics */ bool false_start; /* That version can be used with false start */ bool only_extension; /* negotiated only with an extension */ bool post_handshake_auth; /* Supports the TLS 1.3 post handshake auth */ bool key_shares; /* TLS 1.3 key share key exchange */ bool multi_ocsp; /* TLS 1.3 multiple OCSP responses */ /* * TLS versions modify the semantics of signature algorithms. This number * is there to distinguish signature algorithms semantics between versions * (maps to sign_algorithm_st->tls_sem) */ uint8_t tls_sig_sem; } version_entry_st; /* STATE (cont) */ #include #include typedef struct { uint8_t id[2]; /* used to be (in TLS 1.2) hash algorithm , PK algorithm */ uint8_t tls_sem; /* should match the protocol version's tls_sig_sem. */ } sign_algorithm_st; /* This structure holds parameters got from TLS extension * mechanism. (some extensions may hold parameters in auth_info_t * structures also - see SRP). */ #define MAX_VERIFY_DATA_SIZE 36 /* in SSL 3.0, 12 in TLS 1.0 */ /* auth_info_t structures now MAY contain malloced * elements. */ /* This structure and auth_info_t, are stored in the resume database, * and are restored, in case of resume. * Holds all the required parameters to resume the current * session. */ /* Note that the security parameters structure is set up after the * handshake has finished. The only value you may depend on while * the handshake is in progress is the cipher suite value. */ typedef struct { unsigned int entity; /* GNUTLS_SERVER or GNUTLS_CLIENT */ /* The epoch used to read and write */ uint16_t epoch_read; uint16_t epoch_write; /* The epoch that the next handshake will initialize. */ uint16_t epoch_next; /* The epoch at index 0 of record_parameters. */ uint16_t epoch_min; /* this is the ciphersuite we are going to use * moved here from internals in order to be restored * on resume; */ const struct gnutls_cipher_suite_entry_st *cs; /* This is kept outside the ciphersuite entry as on certain * TLS versions we need a separate PRF MAC, i.e., MD5_SHA1. */ const mac_entry_st *prf; uint8_t master_secret[GNUTLS_MASTER_SIZE]; uint8_t client_random[GNUTLS_RANDOM_SIZE]; uint8_t server_random[GNUTLS_RANDOM_SIZE]; uint8_t session_id[GNUTLS_MAX_SESSION_ID_SIZE]; uint8_t session_id_size; time_t timestamp; /* whether client has agreed in post handshake auth - only set on server side */ uint8_t post_handshake_auth; /* The maximum amount of plaintext sent in a record, * negotiated with the peer. */ uint16_t max_record_send_size; uint16_t max_record_recv_size; /* The maximum amount of plaintext sent in a record, set by * the programmer. */ uint16_t max_user_record_send_size; uint16_t max_user_record_recv_size; /* The maximum amount of early data */ uint32_t max_early_data_size; /* holds the negotiated certificate types */ gnutls_certificate_type_t client_ctype; gnutls_certificate_type_t server_ctype; /* The selected (after server hello EC or DH group */ const gnutls_group_entry_st *grp; /* Holds the signature algorithm that will be used in this session, * selected by the server at the time of Ciphersuite/certificate * selection - see select_sign_algorithm() */ gnutls_sign_algorithm_t server_sign_algo; /* Holds the signature algorithm used in this session - If any */ gnutls_sign_algorithm_t client_sign_algo; /* Whether the master secret negotiation will be according to * draft-ietf-tls-session-hash-01 */ uint8_t ext_master_secret; /* encrypt-then-mac -> rfc7366 */ uint8_t etm; uint8_t client_auth_type; /* gnutls_credentials_type_t */ uint8_t server_auth_type; /* Note: if you add anything in Security_Parameters struct, then * also modify CPY_COMMON in constate.c, and session_pack.c, * in order to save it in the session storage. */ /* Used by extensions that enable supplemental data: Which ones * do that? Do they belong in security parameters? */ int do_recv_supplemental, do_send_supplemental; const version_entry_st *pversion; } security_parameters_st; typedef struct api_aead_cipher_hd_st { cipher_hd_st ctx_enc; } api_aead_cipher_hd_st; struct record_state_st { /* mac keys can be as long as the hash size */ uint8_t mac_key[MAX_HASH_SIZE]; unsigned mac_key_size; uint8_t iv[MAX_CIPHER_IV_SIZE]; unsigned iv_size; uint8_t key[MAX_CIPHER_KEY_SIZE]; unsigned key_size; union { auth_cipher_hd_st tls12; api_aead_cipher_hd_st aead; } ctx; unsigned aead_tag_size; unsigned is_aead; uint64_t sequence_number; }; /* These are used to resolve relative epochs. These values are just outside the 16 bit range to prevent off-by-one errors. An absolute epoch may be referred to by its numeric id in the range 0x0000-0xffff. */ #define EPOCH_READ_CURRENT 70000 #define EPOCH_WRITE_CURRENT 70001 #define EPOCH_NEXT 70002 struct record_parameters_st { uint16_t epoch; int initialized; const cipher_entry_st *cipher; bool etm; const mac_entry_st *mac; /* for DTLS sliding window */ uint64_t dtls_sw_next; /* The end point (next expected packet) of the sliding window without epoch */ uint64_t dtls_sw_bits; unsigned dtls_sw_have_recv; /* whether at least a packet has been received */ record_state_st read; record_state_st write; /* Whether this state is in use, i.e., if there is a pending handshake message waiting to be encrypted under this epoch's parameters. */ int usage_cnt; }; typedef struct { unsigned int priorities[MAX_ALGOS]; unsigned int num_priorities; } priority_st; typedef enum { SR_DISABLED, SR_UNSAFE, SR_PARTIAL, SR_SAFE } safe_renegotiation_t; #define MAX_CIPHERSUITE_SIZE 256 typedef struct ciphersuite_list_st { const gnutls_cipher_suite_entry_st *entry[MAX_CIPHERSUITE_SIZE]; unsigned int size; } ciphersuite_list_st; typedef struct group_list_st { const gnutls_group_entry_st *entry[MAX_ALGOS]; unsigned int size; bool have_ffdhe; } group_list_st; typedef struct sign_algo_list_st { const struct gnutls_sign_entry_st *entry[MAX_ALGOS]; unsigned int size; } sign_algo_list_st; #include "atomic.h" /* For the external api */ struct gnutls_priority_st { priority_st protocol; priority_st client_ctype; priority_st server_ctype; /* The following are not necessary to be stored in * the structure; however they are required by the * external APIs: gnutls_priority_*_list() */ priority_st _cipher; priority_st _mac; priority_st _kx; priority_st _sign_algo; priority_st _supported_ecc; /* the supported groups */ group_list_st groups; /* the supported signature algorithms */ sign_algo_list_st sigalg; /* the supported ciphersuites */ ciphersuite_list_st cs; /* to disable record padding */ bool no_extensions; safe_renegotiation_t sr; bool min_record_version; bool server_precedence; bool allow_server_key_usage_violation; /* for test suite purposes only */ bool no_tickets; bool have_cbc; bool have_psk; bool force_etm; unsigned int additional_verify_flags; /* TLS_FALLBACK_SCSV */ bool fallback; /* The session's expected security level. * Will be used to determine the minimum DH bits, * (or the acceptable certificate security level). */ gnutls_sec_param_t level; /* these should be accessed from * session->internals.VAR names */ bool _allow_large_records; bool _allow_small_records; bool _no_etm; bool _no_ext_master_secret; bool _allow_key_usage_violation; bool _allow_wrong_pms; bool _dumbfw; unsigned int _dh_prime_bits; /* old (deprecated) variable */ DEF_ATOMIC_INT(usage_cnt); }; /* Allow around 50KB of length-hiding padding * when using legacy padding, * or around 3.2MB when using new padding. */ #define DEFAULT_MAX_EMPTY_RECORDS 200 #define ENABLE_COMPAT(x) \ (x)->allow_large_records = 1; \ (x)->allow_small_records = 1; \ (x)->no_etm = 1; \ (x)->no_ext_master_secret = 1; \ (x)->allow_key_usage_violation = 1; \ (x)->allow_wrong_pms = 1; \ (x)->dumbfw = 1 #define ENABLE_PRIO_COMPAT(x) \ (x)->_allow_large_records = 1; \ (x)->_allow_small_records = 1; \ (x)->_no_etm = 1; \ (x)->_no_ext_master_secret = 1; \ (x)->_allow_key_usage_violation = 1; \ (x)->_allow_wrong_pms = 1; \ (x)->_dumbfw = 1 /* DH and RSA parameters types. */ typedef struct gnutls_dh_params_int { /* [0] is the prime, [1] is the generator, [2] is Q if available. */ bigint_t params[3]; int q_bits; /* length of q in bits. If zero then length is unknown. */ } dh_params_st; /* TLS 1.3 session ticket */ typedef struct { struct timespec arrival_time; struct timespec creation_time; uint32_t lifetime; uint32_t age_add; uint8_t nonce[255]; size_t nonce_size; const mac_entry_st *prf; uint8_t resumption_master_secret[MAX_HASH_SIZE]; gnutls_datum_t ticket; } tls13_ticket_st; /* DTLS session state */ typedef struct { /* HelloVerifyRequest DOS prevention cookie */ gnutls_datum_t dcookie; /* For DTLS handshake fragmentation and reassembly. */ uint16_t hsk_write_seq; /* the sequence number of the expected packet */ unsigned int hsk_read_seq; uint16_t mtu; /* a flight transmission is in process */ bool flight_init; /* whether this is the last flight in the protocol */ bool last_flight; /* the retransmission timeout in milliseconds */ unsigned int retrans_timeout_ms; unsigned int hsk_hello_verify_requests; /* The actual retrans_timeout for the next message (e.g. doubled or so) */ unsigned int actual_retrans_timeout_ms; /* timers to handle async handshake after gnutls_handshake() * has terminated. Required to handle retransmissions. */ time_t async_term; /* last retransmission triggered by record layer */ struct timespec last_retransmit; unsigned int packets_dropped; } dtls_st; typedef struct tfo_st { int fd; int flags; bool connect_only; /* a previous sendmsg() failed, attempting connect() */ struct sockaddr_storage connect_addr; socklen_t connect_addrlen; } tfo_st; typedef struct { /* holds all the parsed data received by the record layer */ mbuffer_head_st record_buffer; int handshake_hash_buffer_prev_len; /* keeps the length of handshake_hash_buffer, excluding * the last received message */ unsigned handshake_hash_buffer_client_hello_len; /* if non-zero it is the length of data until the client hello message */ unsigned handshake_hash_buffer_client_kx_len;/* if non-zero it is the length of data until the * the client key exchange message */ unsigned handshake_hash_buffer_server_finished_len;/* if non-zero it is the length of data until the * the server finished message */ unsigned handshake_hash_buffer_client_finished_len;/* if non-zero it is the length of data until the * the client finished message */ gnutls_buffer_st handshake_hash_buffer; /* used to keep the last received handshake * message */ bool resumable; /* TRUE or FALSE - if we can resume that session */ send_ticket_state_t ticket_state; /* used by gnutls_session_ticket_send() */ bye_state_t bye_state; /* used by gnutls_bye() */ reauth_state_t reauth_state; /* used by gnutls_reauth() */ handshake_state_t handshake_final_state; handshake_state_t handshake_state; /* holds * a number which indicates where * the handshake procedure has been * interrupted. If it is 0 then * no interruption has happened. */ bool invalid_connection; /* true or FALSE - if this session is valid */ bool may_not_read; /* if it's 0 then we can read/write, otherwise it's forbidden to read/write */ bool may_not_write; bool read_eof; /* non-zero if we have received a closure alert. */ int last_alert; /* last alert received */ /* The last handshake messages sent or received. */ int last_handshake_in; int last_handshake_out; /* priorities */ struct gnutls_priority_st *priorities; /* variables directly set when setting the priorities above, or * when overriding them */ bool allow_large_records; bool allow_small_records; bool no_etm; bool no_ext_master_secret; bool allow_key_usage_violation; bool allow_wrong_pms; bool dumbfw; /* old (deprecated) variable. This is used for both srp_prime_bits * and dh_prime_bits as they don't overlap */ /* For SRP: minimum bits to allow for SRP * use gnutls_srp_set_prime_bits() to adjust it. */ uint16_t dh_prime_bits; /* srp_prime_bits */ /* resumed session */ bool resumed; /* RESUME_TRUE or FALSE - if we are resuming a session */ /* server side: non-zero if resumption was requested by client * client side: non-zero if we set resumption parameters */ bool resumption_requested; security_parameters_st resumed_security_parameters; gnutls_datum_t resumption_data; /* copy of input to gnutls_session_set_data() */ /* These buffers are used in the handshake * protocol only. freed using _gnutls_handshake_io_buffer_clear(); */ mbuffer_head_st handshake_send_buffer; mbuffer_head_st handshake_header_recv_buffer; handshake_buffer_st handshake_recv_buffer[MAX_HANDSHAKE_MSGS]; int handshake_recv_buffer_size; /* this buffer holds a record packet -mostly used for * non blocking IO. */ mbuffer_head_st record_recv_buffer; /* buffer holding the unparsed record that is currently * being received */ mbuffer_head_st record_send_buffer; /* holds cached data * for the gnutls_io_write_buffered() * function. */ size_t record_send_buffer_user_size; /* holds the * size of the user specified data to * send. */ mbuffer_head_st early_data_recv_buffer; gnutls_buffer_st early_data_presend_buffer; record_send_state_t rsend_state; /* buffer used temporarily during key update */ gnutls_buffer_st record_key_update_buffer; gnutls_buffer_st record_presend_buffer; /* holds cached data * for the gnutls_record_send() * function. */ /* buffer used temporarily during TLS1.3 reauthentication */ gnutls_buffer_st reauth_buffer; time_t expire_time; /* after expire_time seconds this session will expire */ const struct mod_auth_st_int *auth_struct; /* used in handshake packets and KX algorithms */ /* this is the highest version available * to the peer. (advertized version). * This is obtained by the Handshake Client Hello * message. (some implementations read the Record version) */ uint8_t adv_version_major; uint8_t adv_version_minor; /* if this is non zero a certificate request message * will be sent to the client. - only if the ciphersuite * supports it. In server side it contains GNUTLS_CERT_REQUIRE * or similar. */ gnutls_certificate_request_t send_cert_req; size_t max_handshake_data_buffer_size; /* PUSH & PULL functions. */ gnutls_pull_timeout_func pull_timeout_func; gnutls_pull_func pull_func; gnutls_push_func push_func; gnutls_vec_push_func vec_push_func; gnutls_errno_func errno_func; /* Holds the first argument of PUSH and PULL * functions; */ gnutls_transport_ptr_t transport_recv_ptr; gnutls_transport_ptr_t transport_send_ptr; /* STORE & RETRIEVE functions. Only used if other * backend than gdbm is used. */ gnutls_db_store_func db_store_func; gnutls_db_retr_func db_retrieve_func; gnutls_db_remove_func db_remove_func; void *db_ptr; /* post client hello callback (server side only) */ gnutls_handshake_post_client_hello_func user_hello_func; /* handshake hook function */ gnutls_handshake_hook_func h_hook; unsigned int h_type; /* the hooked type */ int16_t h_post; /* whether post-generation/receive */ gnutls_keylog_func keylog_func; /* holds the selected certificate and key. * use _gnutls_selected_certs_deinit() and _gnutls_selected_certs_set() * to change them. */ gnutls_pcert_st *selected_cert_list; uint16_t selected_cert_list_length; struct gnutls_privkey_st *selected_key; /* new callbacks such as gnutls_certificate_retrieve_function3 * set the selected_ocsp datum values. The older OCSP callback-based * functions, set the ocsp_func. The former takes precedence when * set. */ gnutls_ocsp_data_st *selected_ocsp; uint16_t selected_ocsp_length; gnutls_status_request_ocsp_func selected_ocsp_func; void *selected_ocsp_func_ptr; bool selected_need_free; /* This holds the default version that our first * record packet will have. */ uint8_t default_record_version[2]; uint8_t default_hello_version[2]; void *user_ptr; /* Holds 0 if the last called function was interrupted while * receiving, and non zero otherwise. */ bool direction; /* If non zero the server will not advertise the CA's he * trusts (do not send an RDN sequence). */ bool ignore_rdn_sequence; /* This is used to set an arbitrary version in the RSA * PMS secret. Can be used by clients to test whether the * server checks that version. (** only used in gnutls-cli-debug) */ uint8_t rsa_pms_version[2]; /* To avoid using global variables, and especially on Windows where * the application may use a different errno variable than GnuTLS, * it is possible to use gnutls_transport_set_errno to set a * session-specific errno variable in the user-replaceable push/pull * functions. This value is used by the send/recv functions. (The * strange name of this variable is because 'errno' is typically * #define'd.) */ int errnum; /* A handshake process has been completed */ bool initial_negotiation_completed; void *post_negotiation_lock; /* protects access to the variable above * in the cases where negotiation is incomplete * after gnutls_handshake() - early/false start */ /* The type of transport protocol; stream or datagram */ transport_t transport; /* DTLS session state */ dtls_st dtls; /* Protect from infinite loops due to GNUTLS_E_LARGE_PACKET non-handling * or due to multiple alerts being received. */ unsigned handshake_suspicious_loops; /* should be non-zero when a handshake is in progress */ bool handshake_in_progress; /* if set it means that the master key was set using * gnutls_session_set_master() rather than being negotiated. */ bool premaster_set; unsigned int cb_tls_unique_len; unsigned char cb_tls_unique[MAX_VERIFY_DATA_SIZE]; /* starting time of current handshake */ struct timespec handshake_start_time; /* expected end time of current handshake (start+timeout); * this is only filled if a handshake_time_ms is set. */ struct timespec handshake_abs_timeout; /* An estimation of round-trip time under TLS1.3; populated in client side only */ unsigned ertt; unsigned int handshake_timeout_ms; /* timeout in milliseconds */ unsigned int record_timeout_ms; /* timeout in milliseconds */ /* saved context of post handshake certificate request. In * client side is what we received in server's certificate request; * in server side is what we sent to client. */ gnutls_datum_t post_handshake_cr_context; /* it is a copy of the handshake hash buffer if post handshake is used */ gnutls_buffer_st post_handshake_hash_buffer; /* When either of PSK or DHE-PSK is received */ #define HSK_PSK_KE_MODES_RECEIVED (HSK_PSK_KE_MODE_PSK|HSK_PSK_KE_MODE_DHE_PSK|HSK_PSK_KE_MODE_INVALID) #define HSK_CRT_VRFY_EXPECTED 1 #define HSK_CRT_ASKED (1<<2) #define HSK_HRR_SENT (1<<3) #define HSK_HRR_RECEIVED (1<<4) #define HSK_CRT_REQ_SENT (1<<5) #define HSK_KEY_UPDATE_ASKED (1<<7) /* flag is not used during handshake */ #define HSK_FALSE_START_USED (1<<8) /* TLS1.2 only */ #define HSK_HAVE_FFDHE (1<<9) /* whether the peer has advertized at least an FFDHE group */ #define HSK_USED_FFDHE (1<<10) /* whether ffdhe was actually negotiated and used */ #define HSK_PSK_KE_MODES_SENT (1<<11) #define HSK_PSK_KE_MODE_PSK (1<<12) /* client: whether PSK without DH is allowed, * server: whether PSK without DH is selected. */ #define HSK_PSK_KE_MODE_INVALID (1<<13) /* server: no compatible PSK modes were seen */ #define HSK_PSK_KE_MODE_DHE_PSK (1<<14) /* server: whether PSK with DH is selected * client: whether PSK with DH is allowed */ #define HSK_PSK_SELECTED (1<<15) /* server: whether PSK was selected, either for resumption or not; * on resumption session->internals.resumed will be set as well. * client: the same */ #define HSK_KEY_SHARE_SENT (1<<16) /* server: key share was sent to client */ #define HSK_KEY_SHARE_RECEIVED (1<<17) /* client: key share was received * server: key share was received and accepted */ #define HSK_TLS13_TICKET_SENT (1<<18) /* client: sent a ticket under TLS1.3; * server: a ticket was sent to client. */ #define HSK_TLS12_TICKET_SENT (1<<19) /* client: sent a ticket under TLS1.2; * server: a ticket was sent to client. */ #define HSK_TICKET_RECEIVED (1<<20) /* client: a session ticket was received */ #define HSK_EARLY_START_USED (1<<21) #define HSK_EARLY_DATA_IN_FLIGHT (1<<22) /* client: sent early_data extension in ClientHello * server: early_data extension was seen in ClientHello */ #define HSK_EARLY_DATA_ACCEPTED (1<<23) /* client: early_data extension was seen in EncryptedExtensions * server: intend to process early data */ #define HSK_RECORD_SIZE_LIMIT_NEGOTIATED (1<<24) #define HSK_RECORD_SIZE_LIMIT_SENT (1<<25) /* record_size_limit extension was sent */ #define HSK_RECORD_SIZE_LIMIT_RECEIVED (1<<26) /* server: record_size_limit extension was seen but not accepted yet */ #define HSK_OCSP_REQUESTED (1<<27) /* server: client requested OCSP stapling */ #define HSK_CLIENT_OCSP_REQUESTED (1<<28) /* client: server requested OCSP stapling */ /* The hsk_flags are for use within the ongoing handshake; * they are reset to zero prior to handshake start by gnutls_handshake. */ unsigned hsk_flags; struct timespec last_key_update; unsigned key_update_count; /* Read-only pointer to the full ClientHello message */ gnutls_buffer_st full_client_hello; /* The offset at which extensions start in the ClientHello buffer */ int extensions_offset; gnutls_buffer_st hb_local_data; gnutls_buffer_st hb_remote_data; struct timespec hb_ping_start; /* timestamp: when first HeartBeat ping was sent */ struct timespec hb_ping_sent; /* timestamp: when last HeartBeat ping was sent */ unsigned int hb_actual_retrans_timeout_ms; /* current timeout, in milliseconds */ unsigned int hb_retrans_timeout_ms; /* the default timeout, in milliseconds */ unsigned int hb_total_timeout_ms; /* the total timeout, in milliseconds */ bool ocsp_check_ok; /* will be zero if the OCSP response TLS extension * check failed (OCSP was old/unrelated or so). */ heartbeat_state_t hb_state; /* for ping */ recv_state_t recv_state; /* state of the receive function */ /* if set, server and client random were set by the application */ bool sc_random_set; #define INT_FLAG_NO_TLS13 (1LL<<60) uint64_t flags; /* the flags in gnutls_init() and GNUTLS_INT_FLAGS */ /* a verify callback to override the verify callback from the credentials * structure */ gnutls_certificate_verify_function *verify_callback; gnutls_typed_vdata_st *vc_data; gnutls_typed_vdata_st vc_sdata; unsigned vc_elements; unsigned vc_status; unsigned int additional_verify_flags; /* may be set by priorities or the vc functions */ /* we append the verify flags because these can be set, * either by this function or by gnutls_session_set_verify_cert(). * However, we ensure that a single profile is set. */ #define ADD_PROFILE_VFLAGS(session, vflags) do { \ if ((session->internals.additional_verify_flags & GNUTLS_VFLAGS_PROFILE_MASK) && \ (vflags & GNUTLS_VFLAGS_PROFILE_MASK)) \ session->internals.additional_verify_flags &= ~GNUTLS_VFLAGS_PROFILE_MASK; \ session->internals.additional_verify_flags |= vflags; \ } while(0) /* the SHA256 hash of the peer's certificate */ uint8_t cert_hash[32]; bool cert_hash_set; /* The saved username from PSK or SRP auth */ char saved_username[MAX_USERNAME_SIZE+1]; int saved_username_size; /* Needed for TCP Fast Open (TFO), set by gnutls_transport_set_fastopen() */ tfo_st tfo; struct gnutls_supplemental_entry_st *rsup; unsigned rsup_size; struct hello_ext_entry_st *rexts; unsigned rexts_size; struct { /* ext_data[id] contains data for extension_t id */ gnutls_ext_priv_data_t priv; gnutls_ext_priv_data_t resumed_priv; uint8_t set; uint8_t resumed_set; } ext_data[MAX_EXT_TYPES]; /* In case of a client holds the extensions we sent to the peer; * otherwise the extensions we received from the client. This is * an OR of (1<internals.cand_ec_group = session->internals.cand_dh_group = \ session->internals.cand_group = NULL struct gnutls_session_int { security_parameters_st security_parameters; record_parameters_st *record_parameters[MAX_EPOCH_INDEX]; internals_st internals; gnutls_key_st key; }; /* functions */ void _gnutls_free_auth_info(gnutls_session_t session); /* These two macros return the advertised TLS version of * the peer. */ #define _gnutls_get_adv_version_major(session) \ session->internals.adv_version_major #define _gnutls_get_adv_version_minor(session) \ session->internals.adv_version_minor #define set_adv_version(session, major, minor) \ session->internals.adv_version_major = major; \ session->internals.adv_version_minor = minor int _gnutls_is_secure_mem_null(const void *); inline static const version_entry_st *get_version(gnutls_session_t session) { return session->security_parameters.pversion; } inline static unsigned get_num_version(gnutls_session_t session) { if (likely(session->security_parameters.pversion != NULL)) return session->security_parameters.pversion->id; else return GNUTLS_VERSION_UNKNOWN; } void _gnutls_priority_update_fips(void); void _gnutls_priority_update_non_aesni(void); extern unsigned _gnutls_disable_tls13; #define timespec_sub_ms _gnutls_timespec_sub_ms unsigned int /* returns a-b in ms */ timespec_sub_ms(struct timespec *a, struct timespec *b); inline static int _gnutls_timespec_cmp(struct timespec *a, struct timespec *b) { if (a->tv_sec < b->tv_sec) return -1; if (a->tv_sec > b->tv_sec) return 1; if (a->tv_nsec < b->tv_nsec) return -1; if (a->tv_nsec > b->tv_nsec) return 1; return 0; } #include inline static int _gnutls_set_current_version(gnutls_session_t s, unsigned v) { s->security_parameters.pversion = version_to_entry(v); if (s->security_parameters.pversion == NULL) { return GNUTLS_E_UNSUPPORTED_VERSION_PACKET; } return 0; } /* Returns the maximum amount of the plaintext to be sent, considering * both user-specified/negotiated maximum values. */ inline static size_t max_record_send_size(gnutls_session_t session, record_parameters_st * record_params) { size_t max; max = MIN(session->security_parameters.max_record_send_size, session->security_parameters.max_user_record_send_size); if (IS_DTLS(session)) max = MIN(gnutls_dtls_get_data_mtu(session), max); return max; } /* Returns the during the handshake negotiated certificate type(s). * See state.c for the full function documentation. * * This function is made static inline for optimization reasons. */ inline static gnutls_certificate_type_t get_certificate_type(gnutls_session_t session, gnutls_ctype_target_t target) { switch (target) { case GNUTLS_CTYPE_CLIENT: return session->security_parameters.client_ctype; break; case GNUTLS_CTYPE_SERVER: return session->security_parameters.server_ctype; break; case GNUTLS_CTYPE_OURS: if (IS_SERVER(session)) { return session->security_parameters.server_ctype; } else { return session->security_parameters.client_ctype; } break; case GNUTLS_CTYPE_PEERS: if (IS_SERVER(session)) { return session->security_parameters.client_ctype; } else { return session->security_parameters.server_ctype; } break; default: // Illegal parameter passed return GNUTLS_CRT_UNKNOWN; } } /* Macros to aide constant time/mem checks */ #define CONSTCHECK_NOT_EQUAL(a, b) ((-((uint32_t)(a) ^ (uint32_t)(b))) >> 31) #define CONSTCHECK_EQUAL(a, b) (1U - CONSTCHECK_NOT_EQUAL(a, b)) extern unsigned int _gnutls_global_version; #endif /* GNUTLS_LIB_GNUTLS_INT_H */