ssl/record/record.h

   1 /*
   2  * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 typedef struct ssl_connection_st SSL_CONNECTION;
  11
  12 #include <openssl/core_dispatch.h>
  13 #include "internal/recordmethod.h"
  14
  15 /*****************************************************************************
  16  *                                                                           *
  17  * These structures should be considered PRIVATE to the record layer. No     *
  18  * non-record layer code should be using these structures in any way.        *
  19  *                                                                           *
  20  *****************************************************************************/
  21
  22 #define SEQ_NUM_SIZE                            8
  23
  24 typedef struct tls_record_st {
  25     void *rechandle;
  26     int version;
  27     int type;
  28     /* The data buffer containing bytes from the record */
  29     unsigned char *data;
  30     /* Number of remaining to be read in the data buffer */
  31     size_t length;
  32     /* Offset into the data buffer where to start reading */
  33     size_t off;
  34     /* epoch number. DTLS only */
  35     uint16_t epoch;
  36     /* sequence number. DTLS only */
  37     unsigned char seq_num[SEQ_NUM_SIZE];
  38 #ifndef OPENSSL_NO_SCTP
  39     struct bio_dgram_sctp_rcvinfo recordinfo;
  40 #endif
  41 } TLS_RECORD;
  42
  43 typedef struct record_pqueue_st {
  44     uint16_t epoch;
  45     struct pqueue_st *q;
  46 } record_pqueue;
  47
  48 typedef struct dtls_record_layer_st {
  49     /*
  50      * The current data and handshake epoch.  This is initially
  51      * undefined, and starts at zero once the initial handshake is
  52      * completed
  53      */
  54     uint16_t r_epoch;
  55     uint16_t w_epoch;
  56
  57     /*
  58      * Buffered application records. Only for records between CCS and
  59      * Finished to prevent either protocol violation or unnecessary message
  60      * loss.
  61      */
  62     record_pqueue buffered_app_data;
  63 } DTLS_RECORD_LAYER;
  64
  65 /*****************************************************************************
  66  *                                                                           *
  67  * This structure should be considered "opaque" to anything outside of the   *
  68  * record layer. No non-record layer code should be accessing the members of *
  69  * this structure.                                                           *
  70  *                                                                           *
  71  *****************************************************************************/
  72
  73 typedef struct record_layer_st {
  74     /* The parent SSL_CONNECTION structure */
  75     SSL_CONNECTION *s;
  76
  77     /* Custom record layer: always selected if set */
  78     const OSSL_RECORD_METHOD *custom_rlmethod;
  79     /* Record layer specific argument */
  80     void *rlarg;
  81     /* Method to use for the read record layer*/
  82     const OSSL_RECORD_METHOD *rrlmethod;
  83     /* Method to use for the write record layer*/
  84     const OSSL_RECORD_METHOD *wrlmethod;
  85     /* The read record layer object itself */
  86     OSSL_RECORD_LAYER *rrl;
  87     /* The write record layer object itself */
  88     OSSL_RECORD_LAYER *wrl;
  89     /* BIO to store data destined for the next read record layer epoch */
  90     BIO *rrlnext;
  91     /* Default read buffer length to be passed to the record layer */
  92     size_t default_read_buf_len;
  93
  94     /*
  95      * Read as many input bytes as possible (for
  96      * non-blocking reads)
  97      */
  98     int read_ahead;
  99
 100     /* number of bytes sent so far */
 101     size_t wnum;
 102     unsigned char handshake_fragment[4];
 103     size_t handshake_fragment_len;
 104     /* partial write - check the numbers match */
 105     /* number bytes written */
 106     size_t wpend_tot;
 107     int wpend_type;
 108     /* number of bytes submitted */
 109     size_t wpend_ret;
 110     const unsigned char *wpend_buf;
 111
 112     /* Count of the number of consecutive warning alerts received */
 113     unsigned int alert_count;
 114     DTLS_RECORD_LAYER *d;
 115
 116     /* TLS1.3 padding callback */
 117     size_t (*record_padding_cb)(SSL *s, int type, size_t len, void *arg);
 118     void *record_padding_arg;
 119     size_t block_padding;
 120
 121     /* How many records we have read from the record layer */
 122     size_t num_recs;
 123     /* The next record from the record layer that we need to process */
 124     size_t curr_rec;
 125     /* Record layer data to be processed */
 126     TLS_RECORD tlsrecs[SSL_MAX_PIPELINES];
 127
 128 } RECORD_LAYER;
 129
 130 /*****************************************************************************
 131  *                                                                           *
 132  * The following macros/functions represent the libssl internal API to the   *
 133  * record layer. Any libssl code may call these functions/macros             *
 134  *                                                                           *
 135  *****************************************************************************/
 136
 137 #define RECORD_LAYER_set_read_ahead(rl, ra)     ((rl)->read_ahead = (ra))
 138 #define RECORD_LAYER_get_read_ahead(rl)         ((rl)->read_ahead)
 139 #define DTLS_RECORD_LAYER_get_w_epoch(rl)       ((rl)->d->w_epoch)
 140
 141 void RECORD_LAYER_init(RECORD_LAYER *rl, SSL_CONNECTION *s);
 142 void RECORD_LAYER_clear(RECORD_LAYER *rl);
 143 int RECORD_LAYER_read_pending(const RECORD_LAYER *rl);
 144 int RECORD_LAYER_processed_read_pending(const RECORD_LAYER *rl);
 145 int RECORD_LAYER_write_pending(const RECORD_LAYER *rl);
 146 int RECORD_LAYER_is_sslv2_record(RECORD_LAYER *rl);
 147 __owur size_t ssl3_pending(const SSL *s);
 148 __owur int ssl3_write_bytes(SSL *s, int type, const void *buf, size_t len,
 149                             size_t *written);
 150 __owur int ssl3_read_bytes(SSL *s, int type, int *recvd_type,
 151                            unsigned char *buf, size_t len, int peek,
 152                            size_t *readbytes);
 153
 154 int DTLS_RECORD_LAYER_new(RECORD_LAYER *rl);
 155 void DTLS_RECORD_LAYER_free(RECORD_LAYER *rl);
 156 void DTLS_RECORD_LAYER_clear(RECORD_LAYER *rl);
 157 __owur int dtls1_read_bytes(SSL *s, int type, int *recvd_type,
 158                             unsigned char *buf, size_t len, int peek,
 159                             size_t *readbytes);
 160 __owur int dtls1_write_bytes(SSL_CONNECTION *s, int type, const void *buf,
 161                              size_t len, size_t *written);
 162 int do_dtls1_write(SSL_CONNECTION *s, int type, const unsigned char *buf,
 163                    size_t len, size_t *written);
 164 void dtls1_increment_epoch(SSL_CONNECTION *s, int rw);
 165 void ssl_release_record(SSL_CONNECTION *s, TLS_RECORD *rr);
 166
 167 # define HANDLE_RLAYER_READ_RETURN(s, ret) \
 168     ossl_tls_handle_rlayer_return(s, 0, ret, OPENSSL_FILE, OPENSSL_LINE)
 169
 170 # define HANDLE_RLAYER_WRITE_RETURN(s, ret) \
 171     ossl_tls_handle_rlayer_return(s, 1, ret, OPENSSL_FILE, OPENSSL_LINE)
 172
 173 int ossl_tls_handle_rlayer_return(SSL_CONNECTION *s, int writing, int ret,
 174                                   char *file, int line);
 175
 176 int ssl_set_new_record_layer(SSL_CONNECTION *s, int version,
 177                              int direction, int level,
 178                              unsigned char *secret, size_t secretlen,
 179                              unsigned char *key, size_t keylen,
 180                              unsigned char *iv,  size_t ivlen,
 181                              unsigned char *mackey, size_t mackeylen,
 182                              const EVP_CIPHER *ciph, size_t taglen,
 183                              int mactype, const EVP_MD *md,
 184                              const SSL_COMP *comp, const EVP_MD *kdfdigest);
 185 int ssl_set_record_protocol_version(SSL_CONNECTION *s, int vers);
 186
 187 # define OSSL_FUNC_RLAYER_SKIP_EARLY_DATA        1
 188 OSSL_CORE_MAKE_FUNC(int, rlayer_skip_early_data, (void *cbarg))
 189 # define OSSL_FUNC_RLAYER_MSG_CALLBACK           2
 190 OSSL_CORE_MAKE_FUNC(void, rlayer_msg_callback, (int write_p, int version,
 191                                                 int content_type,
 192                                                 const void *buf, size_t len,
 193                                                 void *cbarg))
 194 # define OSSL_FUNC_RLAYER_SECURITY               3
 195 OSSL_CORE_MAKE_FUNC(int, rlayer_security, (void *cbarg, int op, int bits,
 196                                            int nid, void *other))
 197 # define OSSL_FUNC_RLAYER_PADDING                4
 198 OSSL_CORE_MAKE_FUNC(size_t, rlayer_padding, (void *cbarg, int type, size_t len))