mirror of
https://github.com/openssl/openssl.git
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b77f3ed171
Provides consistent output and approach. Reviewed-by: Tim Hudson <tjh@openssl.org> (Merged from https://github.com/openssl/openssl/pull/3496)
990 lines
31 KiB
C
990 lines
31 KiB
C
/*
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* Copyright 2005-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include <errno.h>
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#define USE_SOCKETS
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#include "../ssl_locl.h"
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#include <openssl/evp.h>
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#include <openssl/buffer.h>
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#include "record_locl.h"
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#include "../packet_locl.h"
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int DTLS_RECORD_LAYER_new(RECORD_LAYER *rl)
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{
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DTLS_RECORD_LAYER *d;
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if ((d = OPENSSL_malloc(sizeof(*d))) == NULL)
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return (0);
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rl->d = d;
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d->unprocessed_rcds.q = pqueue_new();
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d->processed_rcds.q = pqueue_new();
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d->buffered_app_data.q = pqueue_new();
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if (d->unprocessed_rcds.q == NULL || d->processed_rcds.q == NULL
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|| d->buffered_app_data.q == NULL) {
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pqueue_free(d->unprocessed_rcds.q);
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pqueue_free(d->processed_rcds.q);
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pqueue_free(d->buffered_app_data.q);
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OPENSSL_free(d);
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rl->d = NULL;
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return (0);
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}
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return 1;
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}
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void DTLS_RECORD_LAYER_free(RECORD_LAYER *rl)
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{
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DTLS_RECORD_LAYER_clear(rl);
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pqueue_free(rl->d->unprocessed_rcds.q);
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pqueue_free(rl->d->processed_rcds.q);
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pqueue_free(rl->d->buffered_app_data.q);
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OPENSSL_free(rl->d);
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rl->d = NULL;
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}
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void DTLS_RECORD_LAYER_clear(RECORD_LAYER *rl)
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{
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DTLS_RECORD_LAYER *d;
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pitem *item = NULL;
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DTLS1_RECORD_DATA *rdata;
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pqueue *unprocessed_rcds;
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pqueue *processed_rcds;
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pqueue *buffered_app_data;
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d = rl->d;
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while ((item = pqueue_pop(d->unprocessed_rcds.q)) != NULL) {
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rdata = (DTLS1_RECORD_DATA *)item->data;
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OPENSSL_free(rdata->rbuf.buf);
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OPENSSL_free(item->data);
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pitem_free(item);
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}
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while ((item = pqueue_pop(d->processed_rcds.q)) != NULL) {
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rdata = (DTLS1_RECORD_DATA *)item->data;
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OPENSSL_free(rdata->rbuf.buf);
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OPENSSL_free(item->data);
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pitem_free(item);
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}
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while ((item = pqueue_pop(d->buffered_app_data.q)) != NULL) {
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rdata = (DTLS1_RECORD_DATA *)item->data;
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OPENSSL_free(rdata->rbuf.buf);
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OPENSSL_free(item->data);
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pitem_free(item);
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}
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unprocessed_rcds = d->unprocessed_rcds.q;
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processed_rcds = d->processed_rcds.q;
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buffered_app_data = d->buffered_app_data.q;
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memset(d, 0, sizeof(*d));
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d->unprocessed_rcds.q = unprocessed_rcds;
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d->processed_rcds.q = processed_rcds;
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d->buffered_app_data.q = buffered_app_data;
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}
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void DTLS_RECORD_LAYER_set_saved_w_epoch(RECORD_LAYER *rl, unsigned short e)
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{
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if (e == rl->d->w_epoch - 1) {
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memcpy(rl->d->curr_write_sequence,
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rl->write_sequence, sizeof(rl->write_sequence));
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memcpy(rl->write_sequence,
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rl->d->last_write_sequence, sizeof(rl->write_sequence));
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} else if (e == rl->d->w_epoch + 1) {
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memcpy(rl->d->last_write_sequence,
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rl->write_sequence, sizeof(unsigned char[8]));
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memcpy(rl->write_sequence,
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rl->d->curr_write_sequence, sizeof(rl->write_sequence));
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}
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rl->d->w_epoch = e;
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}
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void DTLS_RECORD_LAYER_set_write_sequence(RECORD_LAYER *rl, unsigned char *seq)
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{
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memcpy(rl->write_sequence, seq, SEQ_NUM_SIZE);
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}
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/* copy buffered record into SSL structure */
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static int dtls1_copy_record(SSL *s, pitem *item)
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{
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DTLS1_RECORD_DATA *rdata;
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rdata = (DTLS1_RECORD_DATA *)item->data;
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SSL3_BUFFER_release(&s->rlayer.rbuf);
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s->rlayer.packet = rdata->packet;
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s->rlayer.packet_length = rdata->packet_length;
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memcpy(&s->rlayer.rbuf, &(rdata->rbuf), sizeof(SSL3_BUFFER));
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memcpy(&s->rlayer.rrec, &(rdata->rrec), sizeof(SSL3_RECORD));
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/* Set proper sequence number for mac calculation */
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memcpy(&(s->rlayer.read_sequence[2]), &(rdata->packet[5]), 6);
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return (1);
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}
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int dtls1_buffer_record(SSL *s, record_pqueue *queue, unsigned char *priority)
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{
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DTLS1_RECORD_DATA *rdata;
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pitem *item;
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/* Limit the size of the queue to prevent DOS attacks */
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if (pqueue_size(queue->q) >= 100)
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return 0;
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rdata = OPENSSL_malloc(sizeof(*rdata));
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item = pitem_new(priority, rdata);
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if (rdata == NULL || item == NULL) {
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OPENSSL_free(rdata);
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pitem_free(item);
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SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
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return -1;
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}
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rdata->packet = s->rlayer.packet;
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rdata->packet_length = s->rlayer.packet_length;
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memcpy(&(rdata->rbuf), &s->rlayer.rbuf, sizeof(SSL3_BUFFER));
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memcpy(&(rdata->rrec), &s->rlayer.rrec, sizeof(SSL3_RECORD));
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item->data = rdata;
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#ifndef OPENSSL_NO_SCTP
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/* Store bio_dgram_sctp_rcvinfo struct */
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if (BIO_dgram_is_sctp(SSL_get_rbio(s)) &&
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(SSL_get_state(s) == TLS_ST_SR_FINISHED
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|| SSL_get_state(s) == TLS_ST_CR_FINISHED)) {
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BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SCTP_GET_RCVINFO,
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sizeof(rdata->recordinfo), &rdata->recordinfo);
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}
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#endif
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s->rlayer.packet = NULL;
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s->rlayer.packet_length = 0;
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memset(&s->rlayer.rbuf, 0, sizeof(s->rlayer.rbuf));
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memset(&s->rlayer.rrec, 0, sizeof(s->rlayer.rrec));
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if (!ssl3_setup_buffers(s)) {
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SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
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OPENSSL_free(rdata->rbuf.buf);
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OPENSSL_free(rdata);
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pitem_free(item);
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return (-1);
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}
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/* insert should not fail, since duplicates are dropped */
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if (pqueue_insert(queue->q, item) == NULL) {
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SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
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OPENSSL_free(rdata->rbuf.buf);
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OPENSSL_free(rdata);
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pitem_free(item);
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return (-1);
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}
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return (1);
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}
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int dtls1_retrieve_buffered_record(SSL *s, record_pqueue *queue)
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{
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pitem *item;
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item = pqueue_pop(queue->q);
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if (item) {
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dtls1_copy_record(s, item);
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OPENSSL_free(item->data);
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pitem_free(item);
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return (1);
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}
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return (0);
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}
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/*
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* retrieve a buffered record that belongs to the new epoch, i.e., not
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* processed yet
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*/
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#define dtls1_get_unprocessed_record(s) \
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dtls1_retrieve_buffered_record((s), \
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&((s)->rlayer.d->unprocessed_rcds))
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int dtls1_process_buffered_records(SSL *s)
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{
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pitem *item;
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SSL3_BUFFER *rb;
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SSL3_RECORD *rr;
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DTLS1_BITMAP *bitmap;
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unsigned int is_next_epoch;
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int replayok = 1;
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item = pqueue_peek(s->rlayer.d->unprocessed_rcds.q);
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if (item) {
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/* Check if epoch is current. */
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if (s->rlayer.d->unprocessed_rcds.epoch != s->rlayer.d->r_epoch)
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return 1; /* Nothing to do. */
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rr = RECORD_LAYER_get_rrec(&s->rlayer);
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rb = RECORD_LAYER_get_rbuf(&s->rlayer);
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if (SSL3_BUFFER_get_left(rb) > 0) {
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/*
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* We've still got data from the current packet to read. There could
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* be a record from the new epoch in it - so don't overwrite it
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* with the unprocessed records yet (we'll do it when we've
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* finished reading the current packet).
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*/
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return 1;
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}
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/* Process all the records. */
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while (pqueue_peek(s->rlayer.d->unprocessed_rcds.q)) {
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dtls1_get_unprocessed_record(s);
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bitmap = dtls1_get_bitmap(s, rr, &is_next_epoch);
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if (bitmap == NULL) {
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/*
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* Should not happen. This will only ever be NULL when the
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* current record is from a different epoch. But that cannot
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* be the case because we already checked the epoch above
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*/
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SSLerr(SSL_F_DTLS1_PROCESS_BUFFERED_RECORDS,
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ERR_R_INTERNAL_ERROR);
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return 0;
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}
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#ifndef OPENSSL_NO_SCTP
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/* Only do replay check if no SCTP bio */
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if (!BIO_dgram_is_sctp(SSL_get_rbio(s)))
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#endif
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{
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/*
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* Check whether this is a repeat, or aged record. We did this
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* check once already when we first received the record - but
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* we might have updated the window since then due to
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* records we subsequently processed.
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*/
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replayok = dtls1_record_replay_check(s, bitmap);
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}
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if (!replayok || !dtls1_process_record(s, bitmap)) {
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/* dump this record */
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rr->length = 0;
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RECORD_LAYER_reset_packet_length(&s->rlayer);
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continue;
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}
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if (dtls1_buffer_record(s, &(s->rlayer.d->processed_rcds),
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SSL3_RECORD_get_seq_num(s->rlayer.rrec)) < 0)
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return 0;
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}
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}
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/*
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* sync epoch numbers once all the unprocessed records have been
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* processed
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*/
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s->rlayer.d->processed_rcds.epoch = s->rlayer.d->r_epoch;
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s->rlayer.d->unprocessed_rcds.epoch = s->rlayer.d->r_epoch + 1;
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return 1;
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}
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/*-
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* Return up to 'len' payload bytes received in 'type' records.
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* 'type' is one of the following:
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*
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* - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
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* - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
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* - 0 (during a shutdown, no data has to be returned)
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*
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* If we don't have stored data to work from, read a SSL/TLS record first
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* (possibly multiple records if we still don't have anything to return).
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*
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* This function must handle any surprises the peer may have for us, such as
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* Alert records (e.g. close_notify) or renegotiation requests. ChangeCipherSpec
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* messages are treated as if they were handshake messages *if* the |recd_type|
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* argument is non NULL.
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* Also if record payloads contain fragments too small to process, we store
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* them until there is enough for the respective protocol (the record protocol
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* may use arbitrary fragmentation and even interleaving):
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* Change cipher spec protocol
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* just 1 byte needed, no need for keeping anything stored
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* Alert protocol
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* 2 bytes needed (AlertLevel, AlertDescription)
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* Handshake protocol
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* 4 bytes needed (HandshakeType, uint24 length) -- we just have
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* to detect unexpected Client Hello and Hello Request messages
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* here, anything else is handled by higher layers
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* Application data protocol
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* none of our business
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*/
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int dtls1_read_bytes(SSL *s, int type, int *recvd_type, unsigned char *buf,
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size_t len, int peek, size_t *readbytes)
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{
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int al, i, j, iret;
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size_t n;
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SSL3_RECORD *rr;
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void (*cb) (const SSL *ssl, int type2, int val) = NULL;
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if (!SSL3_BUFFER_is_initialised(&s->rlayer.rbuf)) {
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/* Not initialized yet */
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if (!ssl3_setup_buffers(s))
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return (-1);
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}
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if ((type && (type != SSL3_RT_APPLICATION_DATA) &&
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(type != SSL3_RT_HANDSHAKE)) ||
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(peek && (type != SSL3_RT_APPLICATION_DATA))) {
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SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR);
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return -1;
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}
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if (!ossl_statem_get_in_handshake(s) && SSL_in_init(s))
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{
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/* type == SSL3_RT_APPLICATION_DATA */
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i = s->handshake_func(s);
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if (i < 0)
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return i;
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if (i == 0) {
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SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE);
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return -1;
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}
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}
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start:
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s->rwstate = SSL_NOTHING;
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/*-
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* s->s3->rrec.type - is the type of record
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* s->s3->rrec.data, - data
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* s->s3->rrec.off, - offset into 'data' for next read
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* s->s3->rrec.length, - number of bytes.
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*/
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rr = s->rlayer.rrec;
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/*
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* We are not handshaking and have no data yet, so process data buffered
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* during the last handshake in advance, if any.
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*/
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if (SSL_is_init_finished(s) && SSL3_RECORD_get_length(rr) == 0) {
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pitem *item;
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item = pqueue_pop(s->rlayer.d->buffered_app_data.q);
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if (item) {
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#ifndef OPENSSL_NO_SCTP
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/* Restore bio_dgram_sctp_rcvinfo struct */
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if (BIO_dgram_is_sctp(SSL_get_rbio(s))) {
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DTLS1_RECORD_DATA *rdata = (DTLS1_RECORD_DATA *)item->data;
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BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SCTP_SET_RCVINFO,
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sizeof(rdata->recordinfo), &rdata->recordinfo);
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}
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#endif
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dtls1_copy_record(s, item);
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OPENSSL_free(item->data);
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pitem_free(item);
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}
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}
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/* Check for timeout */
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if (dtls1_handle_timeout(s) > 0)
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goto start;
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/* get new packet if necessary */
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if ((SSL3_RECORD_get_length(rr) == 0)
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|| (s->rlayer.rstate == SSL_ST_READ_BODY)) {
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iret = dtls1_get_record(s);
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if (iret <= 0) {
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iret = dtls1_read_failed(s, iret);
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/* anything other than a timeout is an error */
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if (iret <= 0)
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return iret;
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else
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goto start;
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}
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}
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/*
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* Reset the count of consecutive warning alerts if we've got a non-empty
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* record that isn't an alert.
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*/
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if (SSL3_RECORD_get_type(rr) != SSL3_RT_ALERT
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&& SSL3_RECORD_get_length(rr) != 0)
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s->rlayer.alert_count = 0;
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/* we now have a packet which can be read and processed */
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if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
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* reset by ssl3_get_finished */
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&& (SSL3_RECORD_get_type(rr) != SSL3_RT_HANDSHAKE)) {
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/*
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* We now have application data between CCS and Finished. Most likely
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* the packets were reordered on their way, so buffer the application
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* data for later processing rather than dropping the connection.
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*/
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if (dtls1_buffer_record(s, &(s->rlayer.d->buffered_app_data),
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SSL3_RECORD_get_seq_num(rr)) < 0) {
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SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR);
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return -1;
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}
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SSL3_RECORD_set_length(rr, 0);
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goto start;
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}
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/*
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* If the other end has shut down, throw anything we read away (even in
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* 'peek' mode)
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*/
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if (s->shutdown & SSL_RECEIVED_SHUTDOWN) {
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SSL3_RECORD_set_length(rr, 0);
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s->rwstate = SSL_NOTHING;
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return 0;
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}
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if (type == SSL3_RECORD_get_type(rr)
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|| (SSL3_RECORD_get_type(rr) == SSL3_RT_CHANGE_CIPHER_SPEC
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&& type == SSL3_RT_HANDSHAKE && recvd_type != NULL)) {
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/*
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* SSL3_RT_APPLICATION_DATA or
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* SSL3_RT_HANDSHAKE or
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* SSL3_RT_CHANGE_CIPHER_SPEC
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*/
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/*
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* make sure that we are not getting application data when we are
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* doing a handshake for the first time
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*/
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if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
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(s->enc_read_ctx == NULL)) {
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al = SSL_AD_UNEXPECTED_MESSAGE;
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SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_APP_DATA_IN_HANDSHAKE);
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goto f_err;
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}
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if (recvd_type != NULL)
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*recvd_type = SSL3_RECORD_get_type(rr);
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if (len == 0)
|
|
return 0;
|
|
|
|
if (len > SSL3_RECORD_get_length(rr))
|
|
n = SSL3_RECORD_get_length(rr);
|
|
else
|
|
n = len;
|
|
|
|
memcpy(buf, &(SSL3_RECORD_get_data(rr)[SSL3_RECORD_get_off(rr)]), n);
|
|
if (!peek) {
|
|
SSL3_RECORD_sub_length(rr, n);
|
|
SSL3_RECORD_add_off(rr, n);
|
|
if (SSL3_RECORD_get_length(rr) == 0) {
|
|
s->rlayer.rstate = SSL_ST_READ_HEADER;
|
|
SSL3_RECORD_set_off(rr, 0);
|
|
}
|
|
}
|
|
#ifndef OPENSSL_NO_SCTP
|
|
/*
|
|
* We might had to delay a close_notify alert because of reordered
|
|
* app data. If there was an alert and there is no message to read
|
|
* anymore, finally set shutdown.
|
|
*/
|
|
if (BIO_dgram_is_sctp(SSL_get_rbio(s)) &&
|
|
s->d1->shutdown_received
|
|
&& !BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
|
|
s->shutdown |= SSL_RECEIVED_SHUTDOWN;
|
|
return 0;
|
|
}
|
|
#endif
|
|
*readbytes = n;
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* If we get here, then type != rr->type; if we have a handshake message,
|
|
* then it was unexpected (Hello Request or Client Hello).
|
|
*/
|
|
|
|
if (SSL3_RECORD_get_type(rr) == SSL3_RT_ALERT) {
|
|
unsigned int alert_level, alert_descr;
|
|
unsigned char *alert_bytes = SSL3_RECORD_get_data(rr)
|
|
+ SSL3_RECORD_get_off(rr);
|
|
PACKET alert;
|
|
|
|
if (!PACKET_buf_init(&alert, alert_bytes, SSL3_RECORD_get_length(rr))
|
|
|| !PACKET_get_1(&alert, &alert_level)
|
|
|| !PACKET_get_1(&alert, &alert_descr)
|
|
|| PACKET_remaining(&alert) != 0) {
|
|
al = SSL_AD_UNEXPECTED_MESSAGE;
|
|
SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_INVALID_ALERT);
|
|
goto f_err;
|
|
}
|
|
|
|
if (s->msg_callback)
|
|
s->msg_callback(0, s->version, SSL3_RT_ALERT, alert_bytes, 2, s,
|
|
s->msg_callback_arg);
|
|
|
|
if (s->info_callback != NULL)
|
|
cb = s->info_callback;
|
|
else if (s->ctx->info_callback != NULL)
|
|
cb = s->ctx->info_callback;
|
|
|
|
if (cb != NULL) {
|
|
j = (alert_level << 8) | alert_descr;
|
|
cb(s, SSL_CB_READ_ALERT, j);
|
|
}
|
|
|
|
if (alert_level == SSL3_AL_WARNING) {
|
|
s->s3->warn_alert = alert_descr;
|
|
|
|
s->rlayer.alert_count++;
|
|
if (s->rlayer.alert_count == MAX_WARN_ALERT_COUNT) {
|
|
al = SSL_AD_UNEXPECTED_MESSAGE;
|
|
SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_TOO_MANY_WARN_ALERTS);
|
|
goto f_err;
|
|
}
|
|
|
|
if (alert_descr == SSL_AD_CLOSE_NOTIFY) {
|
|
#ifndef OPENSSL_NO_SCTP
|
|
/*
|
|
* With SCTP and streams the socket may deliver app data
|
|
* after a close_notify alert. We have to check this first so
|
|
* that nothing gets discarded.
|
|
*/
|
|
if (BIO_dgram_is_sctp(SSL_get_rbio(s)) &&
|
|
BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
|
|
s->d1->shutdown_received = 1;
|
|
s->rwstate = SSL_READING;
|
|
BIO_clear_retry_flags(SSL_get_rbio(s));
|
|
BIO_set_retry_read(SSL_get_rbio(s));
|
|
return -1;
|
|
}
|
|
#endif
|
|
s->shutdown |= SSL_RECEIVED_SHUTDOWN;
|
|
return 0;
|
|
}
|
|
} else if (alert_level == SSL3_AL_FATAL) {
|
|
char tmp[16];
|
|
|
|
s->rwstate = SSL_NOTHING;
|
|
s->s3->fatal_alert = alert_descr;
|
|
SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr);
|
|
BIO_snprintf(tmp, sizeof tmp, "%d", alert_descr);
|
|
ERR_add_error_data(2, "SSL alert number ", tmp);
|
|
s->shutdown |= SSL_RECEIVED_SHUTDOWN;
|
|
SSL_CTX_remove_session(s->session_ctx, s->session);
|
|
return 0;
|
|
} else {
|
|
al = SSL_AD_ILLEGAL_PARAMETER;
|
|
SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNKNOWN_ALERT_TYPE);
|
|
goto f_err;
|
|
}
|
|
|
|
goto start;
|
|
}
|
|
|
|
if (s->shutdown & SSL_SENT_SHUTDOWN) { /* but we have not received a
|
|
* shutdown */
|
|
s->rwstate = SSL_NOTHING;
|
|
SSL3_RECORD_set_length(rr, 0);
|
|
return 0;
|
|
}
|
|
|
|
if (SSL3_RECORD_get_type(rr) == SSL3_RT_CHANGE_CIPHER_SPEC) {
|
|
/*
|
|
* We can't process a CCS now, because previous handshake messages
|
|
* are still missing, so just drop it.
|
|
*/
|
|
SSL3_RECORD_set_length(rr, 0);
|
|
goto start;
|
|
}
|
|
|
|
/*
|
|
* Unexpected handshake message (Client Hello, or protocol violation)
|
|
*/
|
|
if ((SSL3_RECORD_get_type(rr) == SSL3_RT_HANDSHAKE) &&
|
|
!ossl_statem_get_in_handshake(s)) {
|
|
struct hm_header_st msg_hdr;
|
|
|
|
/*
|
|
* This may just be a stale retransmit. Also sanity check that we have
|
|
* at least enough record bytes for a message header
|
|
*/
|
|
if (SSL3_RECORD_get_epoch(rr) != s->rlayer.d->r_epoch
|
|
|| SSL3_RECORD_get_length(rr) < DTLS1_HM_HEADER_LENGTH) {
|
|
SSL3_RECORD_set_length(rr, 0);
|
|
goto start;
|
|
}
|
|
|
|
dtls1_get_message_header(rr->data, &msg_hdr);
|
|
|
|
/*
|
|
* If we are server, we may have a repeated FINISHED of the client
|
|
* here, then retransmit our CCS and FINISHED.
|
|
*/
|
|
if (msg_hdr.type == SSL3_MT_FINISHED) {
|
|
if (dtls1_check_timeout_num(s) < 0)
|
|
return -1;
|
|
|
|
dtls1_retransmit_buffered_messages(s);
|
|
SSL3_RECORD_set_length(rr, 0);
|
|
goto start;
|
|
}
|
|
|
|
/*
|
|
* To get here we must be trying to read app data but found handshake
|
|
* data. But if we're trying to read app data, and we're not in init
|
|
* (which is tested for at the top of this function) then init must be
|
|
* finished
|
|
*/
|
|
if (!ossl_assert(SSL_is_init_finished(s))) {
|
|
al = SSL_AD_INTERNAL_ERROR;
|
|
SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR);
|
|
goto f_err;
|
|
}
|
|
|
|
/* We found handshake data, so we're going back into init */
|
|
ossl_statem_set_in_init(s, 1);
|
|
|
|
i = s->handshake_func(s);
|
|
if (i < 0)
|
|
return i;
|
|
if (i == 0) {
|
|
SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE);
|
|
return -1;
|
|
}
|
|
|
|
if (!(s->mode & SSL_MODE_AUTO_RETRY)) {
|
|
if (SSL3_BUFFER_get_left(&s->rlayer.rbuf) == 0) {
|
|
/* no read-ahead left? */
|
|
BIO *bio;
|
|
/*
|
|
* In the case where we try to read application data, but we
|
|
* trigger an SSL handshake, we return -1 with the retry
|
|
* option set. Otherwise renegotiation may cause nasty
|
|
* problems in the blocking world
|
|
*/
|
|
s->rwstate = SSL_READING;
|
|
bio = SSL_get_rbio(s);
|
|
BIO_clear_retry_flags(bio);
|
|
BIO_set_retry_read(bio);
|
|
return -1;
|
|
}
|
|
}
|
|
goto start;
|
|
}
|
|
|
|
switch (SSL3_RECORD_get_type(rr)) {
|
|
default:
|
|
al = SSL_AD_UNEXPECTED_MESSAGE;
|
|
SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNEXPECTED_RECORD);
|
|
goto f_err;
|
|
case SSL3_RT_CHANGE_CIPHER_SPEC:
|
|
case SSL3_RT_ALERT:
|
|
case SSL3_RT_HANDSHAKE:
|
|
/*
|
|
* we already handled all of these, with the possible exception of
|
|
* SSL3_RT_HANDSHAKE when ossl_statem_get_in_handshake(s) is true, but
|
|
* that should not happen when type != rr->type
|
|
*/
|
|
al = SSL_AD_UNEXPECTED_MESSAGE;
|
|
SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR);
|
|
goto f_err;
|
|
case SSL3_RT_APPLICATION_DATA:
|
|
/*
|
|
* At this point, we were expecting handshake data, but have
|
|
* application data. If the library was running inside ssl3_read()
|
|
* (i.e. in_read_app_data is set) and it makes sense to read
|
|
* application data at this point (session renegotiation not yet
|
|
* started), we will indulge it.
|
|
*/
|
|
if (s->s3->in_read_app_data &&
|
|
(s->s3->total_renegotiations != 0) &&
|
|
ossl_statem_app_data_allowed(s)) {
|
|
s->s3->in_read_app_data = 2;
|
|
return -1;
|
|
} else {
|
|
al = SSL_AD_UNEXPECTED_MESSAGE;
|
|
SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNEXPECTED_RECORD);
|
|
goto f_err;
|
|
}
|
|
}
|
|
/* not reached */
|
|
|
|
f_err:
|
|
ssl3_send_alert(s, SSL3_AL_FATAL, al);
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Call this to write data in records of type 'type' It will return <= 0 if
|
|
* not all data has been sent or non-blocking IO.
|
|
*/
|
|
int dtls1_write_bytes(SSL *s, int type, const void *buf, size_t len,
|
|
size_t *written)
|
|
{
|
|
int i;
|
|
|
|
if (!ossl_assert(len <= SSL3_RT_MAX_PLAIN_LENGTH))
|
|
return -1;
|
|
s->rwstate = SSL_NOTHING;
|
|
i = do_dtls1_write(s, type, buf, len, 0, written);
|
|
return i;
|
|
}
|
|
|
|
int do_dtls1_write(SSL *s, int type, const unsigned char *buf,
|
|
size_t len, int create_empty_fragment, size_t *written)
|
|
{
|
|
unsigned char *p, *pseq;
|
|
int i, mac_size, clear = 0;
|
|
size_t prefix_len = 0;
|
|
int eivlen;
|
|
SSL3_RECORD wr;
|
|
SSL3_BUFFER *wb;
|
|
SSL_SESSION *sess;
|
|
|
|
wb = &s->rlayer.wbuf[0];
|
|
|
|
/*
|
|
* first check if there is a SSL3_BUFFER still being written out. This
|
|
* will happen with non blocking IO
|
|
*/
|
|
if (!ossl_assert(SSL3_BUFFER_get_left(wb) == 0)) {
|
|
SSLerr(SSL_F_DO_DTLS1_WRITE, ERR_R_INTERNAL_ERROR);
|
|
return 0;
|
|
}
|
|
|
|
/* If we have an alert to send, lets send it */
|
|
if (s->s3->alert_dispatch) {
|
|
i = s->method->ssl_dispatch_alert(s);
|
|
if (i <= 0)
|
|
return i;
|
|
/* if it went, fall through and send more stuff */
|
|
}
|
|
|
|
if (len == 0 && !create_empty_fragment)
|
|
return 0;
|
|
|
|
if (len > s->max_send_fragment) {
|
|
SSLerr(SSL_F_DO_DTLS1_WRITE, SSL_R_EXCEEDS_MAX_FRAGMENT_SIZE);
|
|
return 0;
|
|
}
|
|
|
|
sess = s->session;
|
|
|
|
if ((sess == NULL) ||
|
|
(s->enc_write_ctx == NULL) || (EVP_MD_CTX_md(s->write_hash) == NULL))
|
|
clear = 1;
|
|
|
|
if (clear)
|
|
mac_size = 0;
|
|
else {
|
|
mac_size = EVP_MD_CTX_size(s->write_hash);
|
|
if (mac_size < 0)
|
|
goto err;
|
|
}
|
|
|
|
p = SSL3_BUFFER_get_buf(wb) + prefix_len;
|
|
|
|
/* write the header */
|
|
|
|
*(p++) = type & 0xff;
|
|
SSL3_RECORD_set_type(&wr, type);
|
|
/*
|
|
* Special case: for hello verify request, client version 1.0 and we
|
|
* haven't decided which version to use yet send back using version 1.0
|
|
* header: otherwise some clients will ignore it.
|
|
*/
|
|
if (s->method->version == DTLS_ANY_VERSION &&
|
|
s->max_proto_version != DTLS1_BAD_VER) {
|
|
*(p++) = DTLS1_VERSION >> 8;
|
|
*(p++) = DTLS1_VERSION & 0xff;
|
|
} else {
|
|
*(p++) = s->version >> 8;
|
|
*(p++) = s->version & 0xff;
|
|
}
|
|
|
|
/* field where we are to write out packet epoch, seq num and len */
|
|
pseq = p;
|
|
p += 10;
|
|
|
|
/* Explicit IV length, block ciphers appropriate version flag */
|
|
if (s->enc_write_ctx) {
|
|
int mode = EVP_CIPHER_CTX_mode(s->enc_write_ctx);
|
|
if (mode == EVP_CIPH_CBC_MODE) {
|
|
eivlen = EVP_CIPHER_CTX_iv_length(s->enc_write_ctx);
|
|
if (eivlen <= 1)
|
|
eivlen = 0;
|
|
}
|
|
/* Need explicit part of IV for GCM mode */
|
|
else if (mode == EVP_CIPH_GCM_MODE)
|
|
eivlen = EVP_GCM_TLS_EXPLICIT_IV_LEN;
|
|
else if (mode == EVP_CIPH_CCM_MODE)
|
|
eivlen = EVP_CCM_TLS_EXPLICIT_IV_LEN;
|
|
else
|
|
eivlen = 0;
|
|
} else
|
|
eivlen = 0;
|
|
|
|
/* lets setup the record stuff. */
|
|
SSL3_RECORD_set_data(&wr, p + eivlen); /* make room for IV in case of CBC */
|
|
SSL3_RECORD_set_length(&wr, len);
|
|
SSL3_RECORD_set_input(&wr, (unsigned char *)buf);
|
|
|
|
/*
|
|
* we now 'read' from wr.input, wr.length bytes into wr.data
|
|
*/
|
|
|
|
/* first we compress */
|
|
if (s->compress != NULL) {
|
|
if (!ssl3_do_compress(s, &wr)) {
|
|
SSLerr(SSL_F_DO_DTLS1_WRITE, SSL_R_COMPRESSION_FAILURE);
|
|
goto err;
|
|
}
|
|
} else {
|
|
memcpy(SSL3_RECORD_get_data(&wr), SSL3_RECORD_get_input(&wr),
|
|
SSL3_RECORD_get_length(&wr));
|
|
SSL3_RECORD_reset_input(&wr);
|
|
}
|
|
|
|
/*
|
|
* we should still have the output to wr.data and the input from
|
|
* wr.input. Length should be wr.length. wr.data still points in the
|
|
* wb->buf
|
|
*/
|
|
|
|
if (!SSL_WRITE_ETM(s) && mac_size != 0) {
|
|
if (!s->method->ssl3_enc->mac(s, &wr,
|
|
&(p[SSL3_RECORD_get_length(&wr) + eivlen]),
|
|
1))
|
|
goto err;
|
|
SSL3_RECORD_add_length(&wr, mac_size);
|
|
}
|
|
|
|
/* this is true regardless of mac size */
|
|
SSL3_RECORD_set_data(&wr, p);
|
|
SSL3_RECORD_reset_input(&wr);
|
|
|
|
if (eivlen)
|
|
SSL3_RECORD_add_length(&wr, eivlen);
|
|
|
|
if (s->method->ssl3_enc->enc(s, &wr, 1, 1) < 1)
|
|
goto err;
|
|
|
|
if (SSL_WRITE_ETM(s) && mac_size != 0) {
|
|
if (!s->method->ssl3_enc->mac(s, &wr,
|
|
&(p[SSL3_RECORD_get_length(&wr)]), 1))
|
|
goto err;
|
|
SSL3_RECORD_add_length(&wr, mac_size);
|
|
}
|
|
|
|
/* record length after mac and block padding */
|
|
|
|
/* there's only one epoch between handshake and app data */
|
|
|
|
s2n(s->rlayer.d->w_epoch, pseq);
|
|
|
|
memcpy(pseq, &(s->rlayer.write_sequence[2]), 6);
|
|
pseq += 6;
|
|
s2n(SSL3_RECORD_get_length(&wr), pseq);
|
|
|
|
if (s->msg_callback)
|
|
s->msg_callback(1, 0, SSL3_RT_HEADER, pseq - DTLS1_RT_HEADER_LENGTH,
|
|
DTLS1_RT_HEADER_LENGTH, s, s->msg_callback_arg);
|
|
|
|
/*
|
|
* we should now have wr.data pointing to the encrypted data, which is
|
|
* wr->length long
|
|
*/
|
|
SSL3_RECORD_set_type(&wr, type); /* not needed but helps for debugging */
|
|
SSL3_RECORD_add_length(&wr, DTLS1_RT_HEADER_LENGTH);
|
|
|
|
ssl3_record_sequence_update(&(s->rlayer.write_sequence[0]));
|
|
|
|
if (create_empty_fragment) {
|
|
/*
|
|
* we are in a recursive call; just return the length, don't write
|
|
* out anything here
|
|
*/
|
|
*written = wr.length;
|
|
return 1;
|
|
}
|
|
|
|
/* now let's set up wb */
|
|
SSL3_BUFFER_set_left(wb, prefix_len + SSL3_RECORD_get_length(&wr));
|
|
SSL3_BUFFER_set_offset(wb, 0);
|
|
|
|
/*
|
|
* memorize arguments so that ssl3_write_pending can detect bad write
|
|
* retries later
|
|
*/
|
|
s->rlayer.wpend_tot = len;
|
|
s->rlayer.wpend_buf = buf;
|
|
s->rlayer.wpend_type = type;
|
|
s->rlayer.wpend_ret = len;
|
|
|
|
/* we now just need to write the buffer */
|
|
return ssl3_write_pending(s, type, buf, len, written);
|
|
err:
|
|
return -1;
|
|
}
|
|
|
|
DTLS1_BITMAP *dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr,
|
|
unsigned int *is_next_epoch)
|
|
{
|
|
|
|
*is_next_epoch = 0;
|
|
|
|
/* In current epoch, accept HM, CCS, DATA, & ALERT */
|
|
if (rr->epoch == s->rlayer.d->r_epoch)
|
|
return &s->rlayer.d->bitmap;
|
|
|
|
/*
|
|
* Only HM and ALERT messages can be from the next epoch and only if we
|
|
* have already processed all of the unprocessed records from the last
|
|
* epoch
|
|
*/
|
|
else if (rr->epoch == (unsigned long)(s->rlayer.d->r_epoch + 1) &&
|
|
s->rlayer.d->unprocessed_rcds.epoch != s->rlayer.d->r_epoch &&
|
|
(rr->type == SSL3_RT_HANDSHAKE || rr->type == SSL3_RT_ALERT)) {
|
|
*is_next_epoch = 1;
|
|
return &s->rlayer.d->next_bitmap;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
void dtls1_reset_seq_numbers(SSL *s, int rw)
|
|
{
|
|
unsigned char *seq;
|
|
unsigned int seq_bytes = sizeof(s->rlayer.read_sequence);
|
|
|
|
if (rw & SSL3_CC_READ) {
|
|
seq = s->rlayer.read_sequence;
|
|
s->rlayer.d->r_epoch++;
|
|
memcpy(&s->rlayer.d->bitmap, &s->rlayer.d->next_bitmap,
|
|
sizeof(s->rlayer.d->bitmap));
|
|
memset(&s->rlayer.d->next_bitmap, 0, sizeof(s->rlayer.d->next_bitmap));
|
|
|
|
/*
|
|
* We must not use any buffered messages received from the previous
|
|
* epoch
|
|
*/
|
|
dtls1_clear_received_buffer(s);
|
|
} else {
|
|
seq = s->rlayer.write_sequence;
|
|
memcpy(s->rlayer.d->last_write_sequence, seq,
|
|
sizeof(s->rlayer.write_sequence));
|
|
s->rlayer.d->w_epoch++;
|
|
}
|
|
|
|
memset(seq, 0, seq_bytes);
|
|
}
|