187 lines
4 KiB
C
Executable file
187 lines
4 KiB
C
Executable file
/* $OpenBSD: tls13_record.c,v 1.6 2020/05/11 18:08:11 jsing Exp $ */
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/*
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* Copyright (c) 2018, 2019 Joel Sing <jsing@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "ssl_locl.h"
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#include "tls13_internal.h"
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#include "tls13_record.h"
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struct tls13_record {
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uint16_t version;
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uint8_t content_type;
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size_t rec_len;
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uint8_t *data;
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size_t data_len;
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CBS cbs;
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struct tls13_buffer *buf;
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};
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struct tls13_record *
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tls13_record_new(void)
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{
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struct tls13_record *rec = NULL;
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if ((rec = calloc(1, sizeof(struct tls13_record))) == NULL)
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goto err;
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if ((rec->buf = tls13_buffer_new(TLS13_RECORD_MAX_LEN)) == NULL)
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goto err;
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return rec;
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err:
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tls13_record_free(rec);
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return NULL;
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}
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void
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tls13_record_free(struct tls13_record *rec)
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{
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if (rec == NULL)
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return;
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tls13_buffer_free(rec->buf);
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freezero(rec->data, rec->data_len);
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freezero(rec, sizeof(struct tls13_record));
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}
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uint16_t
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tls13_record_version(struct tls13_record *rec)
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{
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return rec->version;
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}
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uint8_t
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tls13_record_content_type(struct tls13_record *rec)
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{
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return rec->content_type;
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}
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int
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tls13_record_header(struct tls13_record *rec, CBS *cbs)
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{
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if (rec->data_len < TLS13_RECORD_HEADER_LEN)
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return 0;
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CBS_init(cbs, rec->data, TLS13_RECORD_HEADER_LEN);
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return 1;
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}
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int
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tls13_record_content(struct tls13_record *rec, CBS *cbs)
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{
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CBS content;
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tls13_record_data(rec, &content);
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if (!CBS_skip(&content, TLS13_RECORD_HEADER_LEN))
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return 0;
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CBS_dup(&content, cbs);
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return 1;
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}
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void
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tls13_record_data(struct tls13_record *rec, CBS *cbs)
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{
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CBS_init(cbs, rec->data, rec->data_len);
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}
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int
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tls13_record_set_data(struct tls13_record *rec, uint8_t *data, size_t data_len)
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{
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if (data_len > TLS13_RECORD_MAX_LEN)
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return 0;
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freezero(rec->data, rec->data_len);
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rec->data = data;
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rec->data_len = data_len;
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CBS_init(&rec->cbs, rec->data, rec->data_len);
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return 1;
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}
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ssize_t
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tls13_record_recv(struct tls13_record *rec, tls13_read_cb wire_read,
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void *wire_arg)
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{
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uint16_t rec_len, rec_version;
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uint8_t content_type;
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ssize_t ret;
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CBS cbs;
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if (rec->data != NULL)
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return TLS13_IO_FAILURE;
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if (rec->content_type == 0) {
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if ((ret = tls13_buffer_extend(rec->buf,
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TLS13_RECORD_HEADER_LEN, wire_read, wire_arg)) <= 0)
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return ret;
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tls13_buffer_cbs(rec->buf, &cbs);
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if (!CBS_get_u8(&cbs, &content_type))
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return TLS13_IO_FAILURE;
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if (!CBS_get_u16(&cbs, &rec_version))
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return TLS13_IO_FAILURE;
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if (!CBS_get_u16(&cbs, &rec_len))
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return TLS13_IO_FAILURE;
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if ((rec_version >> 8) != SSL3_VERSION_MAJOR)
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return TLS13_IO_RECORD_VERSION;
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if (rec_len > TLS13_RECORD_MAX_CIPHERTEXT_LEN)
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return TLS13_IO_RECORD_OVERFLOW;
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rec->content_type = content_type;
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rec->version = rec_version;
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rec->rec_len = rec_len;
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}
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if ((ret = tls13_buffer_extend(rec->buf,
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TLS13_RECORD_HEADER_LEN + rec->rec_len, wire_read, wire_arg)) <= 0)
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return ret;
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if (!tls13_buffer_finish(rec->buf, &rec->data, &rec->data_len))
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return TLS13_IO_FAILURE;
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return rec->data_len;
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}
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ssize_t
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tls13_record_send(struct tls13_record *rec, tls13_write_cb wire_write,
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void *wire_arg)
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{
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ssize_t ret;
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if (rec->data == NULL)
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return TLS13_IO_FAILURE;
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while (CBS_len(&rec->cbs) > 0) {
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if ((ret = wire_write(CBS_data(&rec->cbs),
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CBS_len(&rec->cbs), wire_arg)) <= 0)
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return ret;
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if (!CBS_skip(&rec->cbs, ret))
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return TLS13_IO_FAILURE;
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}
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return rec->data_len;
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}
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