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 /* Whether the data from this record has already been read or not */
71 /* epoch number, needed by DTLS1 */
74 /* sequence number, needed by DTLS1 */
76 unsigned char seq_num[SEQ_NUM_SIZE];
79 typedef struct tls_record_st {
83 /* The data buffer containing bytes from the record */
85 /* Number of remaining to be read in the data buffer */
87 /* Offset into the data buffer where to start reading */
91 typedef struct dtls1_bitmap_st {
92 /* Track 32 packets on 32-bit systems and 64 - on 64-bit systems */
94 /* Max record number seen so far, 64-bit value in big-endian encoding */
95 unsigned char max_seq_num[SEQ_NUM_SIZE];
98 typedef struct record_pqueue_st {
103 typedef struct dtls1_record_data_st {
104 unsigned char *packet;
105 size_t packet_length;
108 #ifndef OPENSSL_NO_SCTP
109 struct bio_dgram_sctp_rcvinfo recordinfo;
113 typedef struct dtls_record_layer_st {
115 * The current data and handshake epoch. This is initially
116 * undefined, and starts at zero once the initial handshake is
119 unsigned short r_epoch;
120 unsigned short w_epoch;
121 /* records being received in the current epoch */
123 /* renegotiation starts a new set of sequence numbers */
124 DTLS1_BITMAP next_bitmap;
125 /* Received handshake records (processed and unprocessed) */
126 record_pqueue unprocessed_rcds;
127 record_pqueue processed_rcds;
129 * Buffered application records. Only for records between CCS and
130 * Finished to prevent either protocol violation or unnecessary message
133 record_pqueue buffered_app_data;
134 /* save last and current sequence numbers for retransmissions */
135 unsigned char last_write_sequence[8];
136 unsigned char curr_write_sequence[8];
139 /*****************************************************************************
141 * This structure should be considered "opaque" to anything outside of the *
142 * record layer. No non-record layer code should be accessing the members of *
145 *****************************************************************************/
147 typedef struct record_layer_st {
148 /* The parent SSL_CONNECTION structure */
151 * Read as many input bytes as possible (for
152 * non-blocking reads)
155 /* where we are when reading */
157 /* How many pipelines can be used to read data */
159 /* How many pipelines can be used to write data */
161 /* read IO goes into here */
163 /* write IO goes into here */
164 SSL3_BUFFER wbuf[SSL_MAX_PIPELINES];
165 /* each decoded record goes in here */
166 SSL3_RECORD rrec[SSL_MAX_PIPELINES];
167 /* used internally to point at a raw packet */
168 unsigned char *packet;
169 size_t packet_length;
170 /* number of bytes sent so far */
172 unsigned char handshake_fragment[4];
173 size_t handshake_fragment_len;
174 /* The number of consecutive empty records we have received */
175 size_t empty_record_count;
176 /* partial write - check the numbers match */
177 /* number bytes written */
180 /* number of bytes submitted */
182 const unsigned char *wpend_buf;
183 unsigned char read_sequence[SEQ_NUM_SIZE];
184 unsigned char write_sequence[SEQ_NUM_SIZE];
185 /* Set to true if this is the first record in a connection */
186 unsigned int is_first_record;
187 /* Count of the number of consecutive warning alerts received */
188 unsigned int alert_count;
189 DTLS_RECORD_LAYER *d;
191 /* TODO(RECLAYER): Tidy me up. New fields for record management */
193 /* How many records we have read from the record layer */
195 /* The next record from the record layer that we need to process */
197 /* Record layer data to be processed */
198 TLS_RECORD tlsrecs[SSL_MAX_PIPELINES];
202 /*****************************************************************************
204 * The following macros/functions represent the libssl internal API to the *
205 * record layer. Any libssl code may call these functions/macros *
207 *****************************************************************************/
209 struct ssl_mac_buf_st {
213 typedef struct ssl_mac_buf_st SSL_MAC_BUF;
215 #define MIN_SSL2_RECORD_LEN 9
217 #define RECORD_LAYER_set_read_ahead(rl, ra) ((rl)->read_ahead = (ra))
218 #define RECORD_LAYER_get_read_ahead(rl) ((rl)->read_ahead)
219 #define RECORD_LAYER_get_packet(rl) ((rl)->packet)
220 #define RECORD_LAYER_get_packet_length(rl) ((rl)->packet_length)
221 #define RECORD_LAYER_add_packet_length(rl, inc) ((rl)->packet_length += (inc))
222 #define DTLS_RECORD_LAYER_get_w_epoch(rl) ((rl)->d->w_epoch)
223 #define DTLS_RECORD_LAYER_get_processed_rcds(rl) \
224 ((rl)->d->processed_rcds)
225 #define DTLS_RECORD_LAYER_get_unprocessed_rcds(rl) \
226 ((rl)->d->unprocessed_rcds)
227 #define RECORD_LAYER_get_rbuf(rl) (&(rl)->rbuf)
228 #define RECORD_LAYER_get_wbuf(rl) ((rl)->wbuf)
230 void RECORD_LAYER_init(RECORD_LAYER *rl, SSL_CONNECTION *s);
231 void RECORD_LAYER_clear(RECORD_LAYER *rl);
232 void RECORD_LAYER_release(RECORD_LAYER *rl);
233 int RECORD_LAYER_read_pending(const RECORD_LAYER *rl);
234 int RECORD_LAYER_processed_read_pending(const RECORD_LAYER *rl);
235 int RECORD_LAYER_write_pending(const RECORD_LAYER *rl);
236 void RECORD_LAYER_reset_read_sequence(RECORD_LAYER *rl);
237 void RECORD_LAYER_reset_write_sequence(RECORD_LAYER *rl);
238 int RECORD_LAYER_is_sslv2_record(RECORD_LAYER *rl);
239 size_t RECORD_LAYER_get_rrec_length(RECORD_LAYER *rl);
240 __owur size_t ssl3_pending(const SSL *s);
241 __owur int ssl3_write_bytes(SSL *s, int type, const void *buf, size_t len,
243 int do_ssl3_write(SSL_CONNECTION *s, int type, const unsigned char *buf,
244 size_t *pipelens, size_t numpipes,
245 int create_empty_fragment, size_t *written);
246 __owur int ssl3_read_bytes(SSL *s, int type, int *recvd_type,
247 unsigned char *buf, size_t len, int peek,
249 __owur int ssl3_setup_buffers(SSL_CONNECTION *s);
250 __owur int ssl3_enc(SSL_CONNECTION *s, SSL3_RECORD *inrecs, size_t n_recs,
251 int send, SSL_MAC_BUF *mac, size_t macsize);
252 __owur int n_ssl3_mac(SSL_CONNECTION *s, SSL3_RECORD *rec, unsigned char *md,
254 __owur int ssl3_write_pending(SSL_CONNECTION *s, int type,
255 const unsigned char *buf, size_t len,
257 __owur int tls1_enc(SSL_CONNECTION *s, SSL3_RECORD *recs, size_t n_recs,
258 int sending, SSL_MAC_BUF *mac, size_t macsize);
259 __owur int tls1_mac_old(SSL_CONNECTION *s, SSL3_RECORD *rec, unsigned char *md,
261 __owur int tls13_enc(SSL_CONNECTION *s, SSL3_RECORD *recs, size_t n_recs,
262 int send, SSL_MAC_BUF *mac, size_t macsize);
263 int DTLS_RECORD_LAYER_new(RECORD_LAYER *rl);
264 void DTLS_RECORD_LAYER_free(RECORD_LAYER *rl);
265 void DTLS_RECORD_LAYER_clear(RECORD_LAYER *rl);
266 void DTLS_RECORD_LAYER_set_saved_w_epoch(RECORD_LAYER *rl, unsigned short e);
267 void DTLS_RECORD_LAYER_clear(RECORD_LAYER *rl);
268 void DTLS_RECORD_LAYER_set_write_sequence(RECORD_LAYER *rl, unsigned char *seq);
269 __owur int dtls1_read_bytes(SSL *s, int type, int *recvd_type,
270 unsigned char *buf, size_t len, int peek,
272 __owur int dtls1_write_bytes(SSL_CONNECTION *s, int type, const void *buf,
273 size_t len, size_t *written);
274 int do_dtls1_write(SSL_CONNECTION *s, int type, const unsigned char *buf,
275 size_t len, int create_empty_fragment, size_t *written);
276 void dtls1_reset_seq_numbers(SSL_CONNECTION *s, int rw);
277 int dtls_buffer_listen_record(SSL_CONNECTION *s, size_t len, unsigned char *seq,
281 # define HANDLE_RLAYER_RETURN(s, ret) \
282 ossl_tls_handle_rlayer_return(s, ret, OPENSSL_FILE, OPENSSL_LINE)
284 int ossl_tls_handle_rlayer_return(SSL_CONNECTION *s, int ret, char *file,
287 int ssl_set_new_record_layer(SSL_CONNECTION *s, int version, int direction,
288 int level, unsigned char *key, size_t keylen,
289 unsigned char *iv, size_t ivlen,
290 unsigned char *mackey, size_t mackeylen,
291 const EVP_CIPHER *ciph, size_t taglen,
292 int mactype, const EVP_MD *md,
293 const SSL_COMP *comp);
295 # define OSSL_FUNC_RLAYER_SKIP_EARLY_DATA 1
296 OSSL_CORE_MAKE_FUNC(const OSSL_PARAM *, rlayer_skip_early_data,(void *cbarg))