2 * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
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
10 typedef struct ssl_connection_st SSL_CONNECTION;
11 typedef struct ssl3_buffer_st SSL3_BUFFER;
13 #include <openssl/core_dispatch.h>
14 #include "recordmethod.h"
16 /*****************************************************************************
18 * These structures should be considered PRIVATE to the record layer. No *
19 * non-record layer code should be using these structures in any way. *
21 *****************************************************************************/
23 struct ssl3_buffer_st {
24 /* at least SSL3_RT_MAX_PACKET_SIZE bytes, see ssl3_setup_buffers() */
26 /* default buffer size (or 0 if no default set) */
30 /* where to 'copy from' */
32 /* how many bytes left */
34 /* 'buf' is from application for KTLS */
38 #define SEQ_NUM_SIZE 8
40 typedef struct ssl3_record_st {
41 /* Record layer version */
47 /* How many bytes available */
51 * How many bytes were available before padding was removed? This is used
52 * to implement the MAC check in constant time for CBC records.
56 /* read/write offset into 'buf' */
59 /* pointer to the record data */
62 /* where the decode bytes are */
65 /* only used with decompression - malloc()ed */
68 /* epoch number, needed by DTLS1 */
71 /* sequence number, needed by DTLS1 */
73 unsigned char seq_num[SEQ_NUM_SIZE];
76 typedef struct tls_record_st {
80 /* The data buffer containing bytes from the record */
82 /* Number of remaining to be read in the data buffer */
84 /* Offset into the data buffer where to start reading */
86 /* epoch number. DTLS only */
88 /* sequence number. DTLS only */
89 unsigned char seq_num[SEQ_NUM_SIZE];
90 #ifndef OPENSSL_NO_SCTP
91 struct bio_dgram_sctp_rcvinfo recordinfo;
95 typedef struct dtls1_bitmap_st {
96 /* Track 32 packets on 32-bit systems and 64 - on 64-bit systems */
98 /* Max record number seen so far, 64-bit value in big-endian encoding */
99 unsigned char max_seq_num[SEQ_NUM_SIZE];
102 typedef struct record_pqueue_st {
103 unsigned short epoch;
107 typedef struct dtls_record_layer_st {
109 * The current data and handshake epoch. This is initially
110 * undefined, and starts at zero once the initial handshake is
113 unsigned short r_epoch;
114 unsigned short w_epoch;
117 * Buffered application records. Only for records between CCS and
118 * Finished to prevent either protocol violation or unnecessary message
121 record_pqueue buffered_app_data;
122 /* save last and current sequence numbers for retransmissions */
123 unsigned char last_write_sequence[8];
124 unsigned char curr_write_sequence[8];
127 /*****************************************************************************
129 * This structure should be considered "opaque" to anything outside of the *
130 * record layer. No non-record layer code should be accessing the members of *
133 *****************************************************************************/
135 typedef struct record_layer_st {
136 /* The parent SSL_CONNECTION structure */
139 /* Method to use for the read record layer*/
140 const OSSL_RECORD_METHOD *rrlmethod;
141 /* The read record layer object itself */
142 OSSL_RECORD_LAYER *rrl;
143 /* BIO to store data destined for the next read record layer epoch */
145 /* Default read buffer length to be passed to the record layer */
146 size_t default_read_buf_len;
149 * Read as many input bytes as possible (for
150 * non-blocking reads)
153 /* How many pipelines can be used to write data */
155 /* write IO goes into here */
156 SSL3_BUFFER wbuf[SSL_MAX_PIPELINES];
157 /* number of bytes sent so far */
159 unsigned char handshake_fragment[4];
160 size_t handshake_fragment_len;
161 /* partial write - check the numbers match */
162 /* number bytes written */
165 /* number of bytes submitted */
167 const unsigned char *wpend_buf;
169 unsigned char write_sequence[SEQ_NUM_SIZE];
170 /* Count of the number of consecutive warning alerts received */
171 unsigned int alert_count;
172 DTLS_RECORD_LAYER *d;
174 /* How many records we have read from the record layer */
176 /* The next record from the record layer that we need to process */
178 /* Record layer data to be processed */
179 TLS_RECORD tlsrecs[SSL_MAX_PIPELINES];
183 /*****************************************************************************
185 * The following macros/functions represent the libssl internal API to the *
186 * record layer. Any libssl code may call these functions/macros *
188 *****************************************************************************/
190 struct ssl_mac_buf_st {
194 typedef struct ssl_mac_buf_st SSL_MAC_BUF;
196 #define MIN_SSL2_RECORD_LEN 9
198 #define RECORD_LAYER_set_read_ahead(rl, ra) ((rl)->read_ahead = (ra))
199 #define RECORD_LAYER_get_read_ahead(rl) ((rl)->read_ahead)
200 #define RECORD_LAYER_get_packet(rl) ((rl)->packet)
201 #define RECORD_LAYER_add_packet_length(rl, inc) ((rl)->packet_length += (inc))
202 #define DTLS_RECORD_LAYER_get_w_epoch(rl) ((rl)->d->w_epoch)
203 #define RECORD_LAYER_get_rbuf(rl) (&(rl)->rbuf)
204 #define RECORD_LAYER_get_wbuf(rl) ((rl)->wbuf)
206 void RECORD_LAYER_init(RECORD_LAYER *rl, SSL_CONNECTION *s);
207 void RECORD_LAYER_clear(RECORD_LAYER *rl);
208 void RECORD_LAYER_release(RECORD_LAYER *rl);
209 int RECORD_LAYER_read_pending(const RECORD_LAYER *rl);
210 int RECORD_LAYER_processed_read_pending(const RECORD_LAYER *rl);
211 int RECORD_LAYER_write_pending(const RECORD_LAYER *rl);
212 void RECORD_LAYER_reset_write_sequence(RECORD_LAYER *rl);
213 int RECORD_LAYER_is_sslv2_record(RECORD_LAYER *rl);
214 __owur size_t ssl3_pending(const SSL *s);
215 __owur int ssl3_write_bytes(SSL *s, int type, const void *buf, size_t len,
217 int do_ssl3_write(SSL_CONNECTION *s, int type, const unsigned char *buf,
218 size_t *pipelens, size_t numpipes,
219 int create_empty_fragment, size_t *written);
220 __owur int ssl3_read_bytes(SSL *s, int type, int *recvd_type,
221 unsigned char *buf, size_t len, int peek,
223 __owur int ssl3_setup_buffers(SSL_CONNECTION *s);
224 __owur int ssl3_enc(SSL_CONNECTION *s, SSL3_RECORD *inrecs, size_t n_recs,
225 int send, SSL_MAC_BUF *mac, size_t macsize);
226 __owur int n_ssl3_mac(SSL_CONNECTION *s, SSL3_RECORD *rec, unsigned char *md,
228 __owur int ssl3_write_pending(SSL_CONNECTION *s, int type,
229 const unsigned char *buf, size_t len,
231 __owur int tls1_enc(SSL_CONNECTION *s, SSL3_RECORD *recs, size_t n_recs,
232 int sending, SSL_MAC_BUF *mac, size_t macsize);
233 __owur int tls1_mac_old(SSL_CONNECTION *s, SSL3_RECORD *rec, unsigned char *md,
235 __owur int tls13_enc(SSL_CONNECTION *s, SSL3_RECORD *recs, size_t n_recs,
236 int send, SSL_MAC_BUF *mac, size_t macsize);
237 int DTLS_RECORD_LAYER_new(RECORD_LAYER *rl);
238 void DTLS_RECORD_LAYER_free(RECORD_LAYER *rl);
239 void DTLS_RECORD_LAYER_clear(RECORD_LAYER *rl);
240 void DTLS_RECORD_LAYER_set_saved_w_epoch(RECORD_LAYER *rl, unsigned short e);
241 void DTLS_RECORD_LAYER_clear(RECORD_LAYER *rl);
242 void DTLS_RECORD_LAYER_set_write_sequence(RECORD_LAYER *rl, unsigned char *seq);
243 __owur int dtls1_read_bytes(SSL *s, int type, int *recvd_type,
244 unsigned char *buf, size_t len, int peek,
246 __owur int dtls1_write_bytes(SSL_CONNECTION *s, int type, const void *buf,
247 size_t len, size_t *written);
248 int do_dtls1_write(SSL_CONNECTION *s, int type, const unsigned char *buf,
249 size_t len, int create_empty_fragment, size_t *written);
250 void dtls1_reset_seq_numbers(SSL_CONNECTION *s, int rw);
251 void ssl_release_record(SSL_CONNECTION *s, TLS_RECORD *rr);
253 # define HANDLE_RLAYER_RETURN(s, ret) \
254 ossl_tls_handle_rlayer_return(s, ret, OPENSSL_FILE, OPENSSL_LINE)
256 int ossl_tls_handle_rlayer_return(SSL_CONNECTION *s, int ret, char *file,
259 int ssl_set_new_record_layer(SSL_CONNECTION *s, int version, int direction,
260 int level, unsigned char *key, size_t keylen,
261 unsigned char *iv, size_t ivlen,
262 unsigned char *mackey, size_t mackeylen,
263 const EVP_CIPHER *ciph, size_t taglen,
264 int mactype, const EVP_MD *md,
265 const SSL_COMP *comp);
267 # define OSSL_FUNC_RLAYER_SKIP_EARLY_DATA 1
268 OSSL_CORE_MAKE_FUNC(const OSSL_PARAM *, rlayer_skip_early_data, (void *cbarg))
269 # define OSSL_FUNC_RLAYER_MSG_CALLBACK 2
270 OSSL_CORE_MAKE_FUNC(void, rlayer_msg_callback, (int write_p, int version,
272 const void *buf, size_t len,
274 # define OSSL_FUNC_RLAYER_SECURITY 3
275 OSSL_CORE_MAKE_FUNC(int, rlayer_security, (void *cbarg, int op, int bits,
276 int nid, void *other))