[331] | 1 | /*
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| 2 | * Copyright 2005-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <stdio.h>
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| 11 | #include <errno.h>
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| 12 | #define USE_SOCKETS
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| 13 | #include "../ssl_locl.h"
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| 14 | #include <openssl/evp.h>
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| 15 | #include <openssl/buffer.h>
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| 16 | #include "record_locl.h"
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| 17 |
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| 18 | int DTLS_RECORD_LAYER_new(RECORD_LAYER *rl)
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| 19 | {
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| 20 | DTLS_RECORD_LAYER *d;
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| 21 |
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| 22 | if ((d = OPENSSL_malloc(sizeof(*d))) == NULL)
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| 23 | return (0);
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| 24 |
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| 25 | rl->d = d;
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| 26 |
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| 27 | d->unprocessed_rcds.q = pqueue_new();
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| 28 | d->processed_rcds.q = pqueue_new();
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| 29 | d->buffered_app_data.q = pqueue_new();
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| 30 |
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| 31 | if (d->unprocessed_rcds.q == NULL || d->processed_rcds.q == NULL
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| 32 | || d->buffered_app_data.q == NULL) {
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| 33 | pqueue_free(d->unprocessed_rcds.q);
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| 34 | pqueue_free(d->processed_rcds.q);
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| 35 | pqueue_free(d->buffered_app_data.q);
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| 36 | OPENSSL_free(d);
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| 37 | rl->d = NULL;
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| 38 | return (0);
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| 39 | }
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| 40 |
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| 41 | return 1;
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| 42 | }
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| 43 |
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| 44 | void DTLS_RECORD_LAYER_free(RECORD_LAYER *rl)
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| 45 | {
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| 46 | DTLS_RECORD_LAYER_clear(rl);
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| 47 | pqueue_free(rl->d->unprocessed_rcds.q);
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| 48 | pqueue_free(rl->d->processed_rcds.q);
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| 49 | pqueue_free(rl->d->buffered_app_data.q);
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| 50 | OPENSSL_free(rl->d);
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| 51 | rl->d = NULL;
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| 52 | }
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| 53 |
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| 54 | void DTLS_RECORD_LAYER_clear(RECORD_LAYER *rl)
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| 55 | {
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| 56 | DTLS_RECORD_LAYER *d;
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| 57 | pitem *item = NULL;
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| 58 | DTLS1_RECORD_DATA *rdata;
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| 59 | pqueue *unprocessed_rcds;
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| 60 | pqueue *processed_rcds;
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| 61 | pqueue *buffered_app_data;
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| 62 |
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| 63 | d = rl->d;
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| 64 |
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| 65 | while ((item = pqueue_pop(d->unprocessed_rcds.q)) != NULL) {
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| 66 | rdata = (DTLS1_RECORD_DATA *)item->data;
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| 67 | OPENSSL_free(rdata->rbuf.buf);
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| 68 | OPENSSL_free(item->data);
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| 69 | pitem_free(item);
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| 70 | }
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| 71 |
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| 72 | while ((item = pqueue_pop(d->processed_rcds.q)) != NULL) {
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| 73 | rdata = (DTLS1_RECORD_DATA *)item->data;
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| 74 | OPENSSL_free(rdata->rbuf.buf);
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| 75 | OPENSSL_free(item->data);
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| 76 | pitem_free(item);
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| 77 | }
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| 78 |
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| 79 | while ((item = pqueue_pop(d->buffered_app_data.q)) != NULL) {
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| 80 | rdata = (DTLS1_RECORD_DATA *)item->data;
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| 81 | OPENSSL_free(rdata->rbuf.buf);
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| 82 | OPENSSL_free(item->data);
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| 83 | pitem_free(item);
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| 84 | }
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| 85 |
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| 86 | unprocessed_rcds = d->unprocessed_rcds.q;
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| 87 | processed_rcds = d->processed_rcds.q;
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| 88 | buffered_app_data = d->buffered_app_data.q;
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| 89 | memset(d, 0, sizeof(*d));
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| 90 | d->unprocessed_rcds.q = unprocessed_rcds;
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| 91 | d->processed_rcds.q = processed_rcds;
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| 92 | d->buffered_app_data.q = buffered_app_data;
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| 93 | }
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| 94 |
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| 95 | void DTLS_RECORD_LAYER_set_saved_w_epoch(RECORD_LAYER *rl, unsigned short e)
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| 96 | {
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| 97 | if (e == rl->d->w_epoch - 1) {
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| 98 | memcpy(rl->d->curr_write_sequence,
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| 99 | rl->write_sequence, sizeof(rl->write_sequence));
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| 100 | memcpy(rl->write_sequence,
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| 101 | rl->d->last_write_sequence, sizeof(rl->write_sequence));
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| 102 | } else if (e == rl->d->w_epoch + 1) {
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| 103 | memcpy(rl->d->last_write_sequence,
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| 104 | rl->write_sequence, sizeof(unsigned char[8]));
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| 105 | memcpy(rl->write_sequence,
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| 106 | rl->d->curr_write_sequence, sizeof(rl->write_sequence));
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| 107 | }
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| 108 | rl->d->w_epoch = e;
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| 109 | }
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| 110 |
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| 111 | void DTLS_RECORD_LAYER_resync_write(RECORD_LAYER *rl)
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| 112 | {
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| 113 | memcpy(rl->write_sequence, rl->read_sequence, sizeof(rl->write_sequence));
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| 114 | }
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| 115 |
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| 116 | void DTLS_RECORD_LAYER_set_write_sequence(RECORD_LAYER *rl, unsigned char *seq)
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| 117 | {
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| 118 | memcpy(rl->write_sequence, seq, SEQ_NUM_SIZE);
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| 119 | }
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| 120 |
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| 121 | static int have_handshake_fragment(SSL *s, int type, unsigned char *buf,
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| 122 | int len);
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| 123 |
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| 124 | /* copy buffered record into SSL structure */
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| 125 | static int dtls1_copy_record(SSL *s, pitem *item)
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| 126 | {
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| 127 | DTLS1_RECORD_DATA *rdata;
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| 128 |
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| 129 | rdata = (DTLS1_RECORD_DATA *)item->data;
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| 130 |
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| 131 | SSL3_BUFFER_release(&s->rlayer.rbuf);
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| 132 |
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| 133 | s->rlayer.packet = rdata->packet;
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| 134 | s->rlayer.packet_length = rdata->packet_length;
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| 135 | memcpy(&s->rlayer.rbuf, &(rdata->rbuf), sizeof(SSL3_BUFFER));
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| 136 | memcpy(&s->rlayer.rrec, &(rdata->rrec), sizeof(SSL3_RECORD));
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| 137 |
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| 138 | /* Set proper sequence number for mac calculation */
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| 139 | memcpy(&(s->rlayer.read_sequence[2]), &(rdata->packet[5]), 6);
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| 140 |
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| 141 | return (1);
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| 142 | }
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| 143 |
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| 144 | int dtls1_buffer_record(SSL *s, record_pqueue *queue, unsigned char *priority)
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| 145 | {
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| 146 | DTLS1_RECORD_DATA *rdata;
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| 147 | pitem *item;
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| 148 |
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| 149 | /* Limit the size of the queue to prevent DOS attacks */
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| 150 | if (pqueue_size(queue->q) >= 100)
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| 151 | return 0;
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| 152 |
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| 153 | rdata = OPENSSL_malloc(sizeof(*rdata));
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| 154 | item = pitem_new(priority, rdata);
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| 155 | if (rdata == NULL || item == NULL) {
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| 156 | OPENSSL_free(rdata);
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| 157 | pitem_free(item);
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| 158 | SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
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| 159 | return -1;
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| 160 | }
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| 161 |
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| 162 | rdata->packet = s->rlayer.packet;
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| 163 | rdata->packet_length = s->rlayer.packet_length;
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| 164 | memcpy(&(rdata->rbuf), &s->rlayer.rbuf, sizeof(SSL3_BUFFER));
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| 165 | memcpy(&(rdata->rrec), &s->rlayer.rrec, sizeof(SSL3_RECORD));
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| 166 |
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| 167 | item->data = rdata;
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| 168 |
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| 169 | #ifndef OPENSSL_NO_SCTP
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| 170 | /* Store bio_dgram_sctp_rcvinfo struct */
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| 171 | if (BIO_dgram_is_sctp(SSL_get_rbio(s)) &&
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| 172 | (SSL_get_state(s) == TLS_ST_SR_FINISHED
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| 173 | || SSL_get_state(s) == TLS_ST_CR_FINISHED)) {
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| 174 | BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SCTP_GET_RCVINFO,
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| 175 | sizeof(rdata->recordinfo), &rdata->recordinfo);
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| 176 | }
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| 177 | #endif
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| 178 |
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| 179 | s->rlayer.packet = NULL;
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| 180 | s->rlayer.packet_length = 0;
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| 181 | memset(&s->rlayer.rbuf, 0, sizeof(s->rlayer.rbuf));
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| 182 | memset(&s->rlayer.rrec, 0, sizeof(s->rlayer.rrec));
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| 183 |
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| 184 | if (!ssl3_setup_buffers(s)) {
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| 185 | SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
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| 186 | OPENSSL_free(rdata->rbuf.buf);
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| 187 | OPENSSL_free(rdata);
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| 188 | pitem_free(item);
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| 189 | return (-1);
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| 190 | }
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| 191 |
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| 192 | /* insert should not fail, since duplicates are dropped */
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| 193 | if (pqueue_insert(queue->q, item) == NULL) {
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| 194 | SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
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| 195 | OPENSSL_free(rdata->rbuf.buf);
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| 196 | OPENSSL_free(rdata);
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| 197 | pitem_free(item);
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| 198 | return (-1);
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| 199 | }
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| 200 |
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| 201 | return (1);
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| 202 | }
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| 203 |
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| 204 | int dtls1_retrieve_buffered_record(SSL *s, record_pqueue *queue)
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| 205 | {
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| 206 | pitem *item;
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| 207 |
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| 208 | item = pqueue_pop(queue->q);
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| 209 | if (item) {
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| 210 | dtls1_copy_record(s, item);
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| 211 |
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| 212 | OPENSSL_free(item->data);
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| 213 | pitem_free(item);
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| 214 |
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| 215 | return (1);
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| 216 | }
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| 217 |
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| 218 | return (0);
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| 219 | }
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| 220 |
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| 221 | /*
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| 222 | * retrieve a buffered record that belongs to the new epoch, i.e., not
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| 223 | * processed yet
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| 224 | */
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| 225 | #define dtls1_get_unprocessed_record(s) \
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| 226 | dtls1_retrieve_buffered_record((s), \
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| 227 | &((s)->rlayer.d->unprocessed_rcds))
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| 228 |
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| 229 | int dtls1_process_buffered_records(SSL *s)
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| 230 | {
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| 231 | pitem *item;
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| 232 | SSL3_BUFFER *rb;
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| 233 | SSL3_RECORD *rr;
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| 234 | DTLS1_BITMAP *bitmap;
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| 235 | unsigned int is_next_epoch;
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| 236 | int replayok = 1;
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| 237 |
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| 238 | item = pqueue_peek(s->rlayer.d->unprocessed_rcds.q);
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| 239 | if (item) {
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| 240 | /* Check if epoch is current. */
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| 241 | if (s->rlayer.d->unprocessed_rcds.epoch != s->rlayer.d->r_epoch)
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| 242 | return 1; /* Nothing to do. */
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| 243 |
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| 244 | rr = RECORD_LAYER_get_rrec(&s->rlayer);
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| 245 |
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| 246 | rb = RECORD_LAYER_get_rbuf(&s->rlayer);
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| 247 |
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| 248 | if (SSL3_BUFFER_get_left(rb) > 0) {
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| 249 | /*
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| 250 | * We've still got data from the current packet to read. There could
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| 251 | * be a record from the new epoch in it - so don't overwrite it
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| 252 | * with the unprocessed records yet (we'll do it when we've
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| 253 | * finished reading the current packet).
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| 254 | */
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| 255 | return 1;
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| 256 | }
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| 257 |
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| 258 | /* Process all the records. */
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| 259 | while (pqueue_peek(s->rlayer.d->unprocessed_rcds.q)) {
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| 260 | dtls1_get_unprocessed_record(s);
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| 261 | bitmap = dtls1_get_bitmap(s, rr, &is_next_epoch);
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| 262 | if (bitmap == NULL) {
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| 263 | /*
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| 264 | * Should not happen. This will only ever be NULL when the
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| 265 | * current record is from a different epoch. But that cannot
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| 266 | * be the case because we already checked the epoch above
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| 267 | */
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| 268 | SSLerr(SSL_F_DTLS1_PROCESS_BUFFERED_RECORDS,
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| 269 | ERR_R_INTERNAL_ERROR);
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| 270 | return 0;
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| 271 | }
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| 272 | #ifndef OPENSSL_NO_SCTP
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| 273 | /* Only do replay check if no SCTP bio */
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| 274 | if (!BIO_dgram_is_sctp(SSL_get_rbio(s)))
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| 275 | #endif
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| 276 | {
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| 277 | /*
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| 278 | * Check whether this is a repeat, or aged record. We did this
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| 279 | * check once already when we first received the record - but
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| 280 | * we might have updated the window since then due to
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| 281 | * records we subsequently processed.
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| 282 | */
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| 283 | replayok = dtls1_record_replay_check(s, bitmap);
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| 284 | }
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| 285 |
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| 286 | if (!replayok || !dtls1_process_record(s, bitmap)) {
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| 287 | /* dump this record */
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| 288 | rr->length = 0;
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| 289 | RECORD_LAYER_reset_packet_length(&s->rlayer);
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| 290 | continue;
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| 291 | }
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| 292 |
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| 293 | if (dtls1_buffer_record(s, &(s->rlayer.d->processed_rcds),
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| 294 | SSL3_RECORD_get_seq_num(s->rlayer.rrec)) < 0)
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| 295 | return 0;
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| 296 | }
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| 297 | }
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| 298 |
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| 299 | /*
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| 300 | * sync epoch numbers once all the unprocessed records have been
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| 301 | * processed
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| 302 | */
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| 303 | s->rlayer.d->processed_rcds.epoch = s->rlayer.d->r_epoch;
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| 304 | s->rlayer.d->unprocessed_rcds.epoch = s->rlayer.d->r_epoch + 1;
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| 305 |
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| 306 | return 1;
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| 307 | }
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| 308 |
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| 309 | /*-
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| 310 | * Return up to 'len' payload bytes received in 'type' records.
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| 311 | * 'type' is one of the following:
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| 312 | *
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| 313 | * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
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| 314 | * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
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| 315 | * - 0 (during a shutdown, no data has to be returned)
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| 316 | *
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| 317 | * If we don't have stored data to work from, read a SSL/TLS record first
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| 318 | * (possibly multiple records if we still don't have anything to return).
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| 319 | *
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| 320 | * This function must handle any surprises the peer may have for us, such as
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| 321 | * Alert records (e.g. close_notify) or renegotiation requests. ChangeCipherSpec
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| 322 | * messages are treated as if they were handshake messages *if* the |recd_type|
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| 323 | * argument is non NULL.
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| 324 | * Also if record payloads contain fragments too small to process, we store
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| 325 | * them until there is enough for the respective protocol (the record protocol
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| 326 | * may use arbitrary fragmentation and even interleaving):
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| 327 | * Change cipher spec protocol
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| 328 | * just 1 byte needed, no need for keeping anything stored
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| 329 | * Alert protocol
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| 330 | * 2 bytes needed (AlertLevel, AlertDescription)
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| 331 | * Handshake protocol
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| 332 | * 4 bytes needed (HandshakeType, uint24 length) -- we just have
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| 333 | * to detect unexpected Client Hello and Hello Request messages
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| 334 | * here, anything else is handled by higher layers
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| 335 | * Application data protocol
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| 336 | * none of our business
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| 337 | */
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| 338 | int dtls1_read_bytes(SSL *s, int type, int *recvd_type, unsigned char *buf,
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| 339 | int len, int peek)
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| 340 | {
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| 341 | int al, i, j, ret;
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| 342 | unsigned int n;
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| 343 | SSL3_RECORD *rr;
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| 344 | void (*cb) (const SSL *ssl, int type2, int val) = NULL;
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| 345 |
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| 346 | if (!SSL3_BUFFER_is_initialised(&s->rlayer.rbuf)) {
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| 347 | /* Not initialized yet */
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| 348 | if (!ssl3_setup_buffers(s))
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| 349 | return (-1);
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| 350 | }
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| 351 |
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| 352 | if ((type && (type != SSL3_RT_APPLICATION_DATA) &&
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| 353 | (type != SSL3_RT_HANDSHAKE)) ||
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| 354 | (peek && (type != SSL3_RT_APPLICATION_DATA))) {
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| 355 | SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR);
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| 356 | return -1;
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| 357 | }
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| 358 |
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| 359 | /*
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| 360 | * check whether there's a handshake message (client hello?) waiting
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| 361 | */
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| 362 | if ((ret = have_handshake_fragment(s, type, buf, len))) {
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| 363 | *recvd_type = SSL3_RT_HANDSHAKE;
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| 364 | return ret;
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| 365 | }
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| 366 |
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| 367 | /*
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| 368 | * Now s->rlayer.d->handshake_fragment_len == 0 if
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| 369 | * type == SSL3_RT_HANDSHAKE.
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| 370 | */
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| 371 |
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| 372 | #ifndef OPENSSL_NO_SCTP
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| 373 | /*
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| 374 | * Continue handshake if it had to be interrupted to read app data with
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| 375 | * SCTP.
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| 376 | */
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| 377 | if ((!ossl_statem_get_in_handshake(s) && SSL_in_init(s)) ||
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| 378 | (BIO_dgram_is_sctp(SSL_get_rbio(s))
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| 379 | && ossl_statem_in_sctp_read_sock(s)
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| 380 | && s->s3->in_read_app_data != 2))
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| 381 | #else
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| 382 | if (!ossl_statem_get_in_handshake(s) && SSL_in_init(s))
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| 383 | #endif
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| 384 | {
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| 385 | /* type == SSL3_RT_APPLICATION_DATA */
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| 386 | i = s->handshake_func(s);
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| 387 | if (i < 0)
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| 388 | return (i);
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| 389 | if (i == 0) {
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| 390 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE);
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| 391 | return (-1);
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| 392 | }
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| 393 | }
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| 394 |
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| 395 | start:
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| 396 | s->rwstate = SSL_NOTHING;
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| 397 |
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| 398 | /*-
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| 399 | * s->s3->rrec.type - is the type of record
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| 400 | * s->s3->rrec.data, - data
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| 401 | * s->s3->rrec.off, - offset into 'data' for next read
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| 402 | * s->s3->rrec.length, - number of bytes.
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| 403 | */
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| 404 | rr = s->rlayer.rrec;
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| 405 |
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| 406 | /*
|
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| 407 | * We are not handshaking and have no data yet, so process data buffered
|
---|
| 408 | * during the last handshake in advance, if any.
|
---|
| 409 | */
|
---|
| 410 | if (SSL_is_init_finished(s) && SSL3_RECORD_get_length(rr) == 0) {
|
---|
| 411 | pitem *item;
|
---|
| 412 | item = pqueue_pop(s->rlayer.d->buffered_app_data.q);
|
---|
| 413 | if (item) {
|
---|
| 414 | #ifndef OPENSSL_NO_SCTP
|
---|
| 415 | /* Restore bio_dgram_sctp_rcvinfo struct */
|
---|
| 416 | if (BIO_dgram_is_sctp(SSL_get_rbio(s))) {
|
---|
| 417 | DTLS1_RECORD_DATA *rdata = (DTLS1_RECORD_DATA *)item->data;
|
---|
| 418 | BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SCTP_SET_RCVINFO,
|
---|
| 419 | sizeof(rdata->recordinfo), &rdata->recordinfo);
|
---|
| 420 | }
|
---|
| 421 | #endif
|
---|
| 422 |
|
---|
| 423 | dtls1_copy_record(s, item);
|
---|
| 424 |
|
---|
| 425 | OPENSSL_free(item->data);
|
---|
| 426 | pitem_free(item);
|
---|
| 427 | }
|
---|
| 428 | }
|
---|
| 429 |
|
---|
| 430 | /* Check for timeout */
|
---|
| 431 | if (dtls1_handle_timeout(s) > 0)
|
---|
| 432 | goto start;
|
---|
| 433 |
|
---|
| 434 | /* get new packet if necessary */
|
---|
| 435 | if ((SSL3_RECORD_get_length(rr) == 0)
|
---|
| 436 | || (s->rlayer.rstate == SSL_ST_READ_BODY)) {
|
---|
| 437 | ret = dtls1_get_record(s);
|
---|
| 438 | if (ret <= 0) {
|
---|
| 439 | ret = dtls1_read_failed(s, ret);
|
---|
| 440 | /* anything other than a timeout is an error */
|
---|
| 441 | if (ret <= 0)
|
---|
| 442 | return (ret);
|
---|
| 443 | else
|
---|
| 444 | goto start;
|
---|
| 445 | }
|
---|
| 446 | }
|
---|
| 447 |
|
---|
| 448 | /*
|
---|
| 449 | * Reset the count of consecutive warning alerts if we've got a non-empty
|
---|
| 450 | * record that isn't an alert.
|
---|
| 451 | */
|
---|
| 452 | if (SSL3_RECORD_get_type(rr) != SSL3_RT_ALERT
|
---|
| 453 | && SSL3_RECORD_get_length(rr) != 0)
|
---|
| 454 | s->rlayer.alert_count = 0;
|
---|
| 455 |
|
---|
| 456 | /* we now have a packet which can be read and processed */
|
---|
| 457 |
|
---|
| 458 | if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
|
---|
| 459 | * reset by ssl3_get_finished */
|
---|
| 460 | && (SSL3_RECORD_get_type(rr) != SSL3_RT_HANDSHAKE)) {
|
---|
| 461 | /*
|
---|
| 462 | * We now have application data between CCS and Finished. Most likely
|
---|
| 463 | * the packets were reordered on their way, so buffer the application
|
---|
| 464 | * data for later processing rather than dropping the connection.
|
---|
| 465 | */
|
---|
| 466 | if (dtls1_buffer_record(s, &(s->rlayer.d->buffered_app_data),
|
---|
| 467 | SSL3_RECORD_get_seq_num(rr)) < 0) {
|
---|
| 468 | SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR);
|
---|
| 469 | return -1;
|
---|
| 470 | }
|
---|
| 471 | SSL3_RECORD_set_length(rr, 0);
|
---|
| 472 | goto start;
|
---|
| 473 | }
|
---|
| 474 |
|
---|
| 475 | /*
|
---|
| 476 | * If the other end has shut down, throw anything we read away (even in
|
---|
| 477 | * 'peek' mode)
|
---|
| 478 | */
|
---|
| 479 | if (s->shutdown & SSL_RECEIVED_SHUTDOWN) {
|
---|
| 480 | SSL3_RECORD_set_length(rr, 0);
|
---|
| 481 | s->rwstate = SSL_NOTHING;
|
---|
| 482 | return (0);
|
---|
| 483 | }
|
---|
| 484 |
|
---|
| 485 | if (type == SSL3_RECORD_get_type(rr)
|
---|
| 486 | || (SSL3_RECORD_get_type(rr) == SSL3_RT_CHANGE_CIPHER_SPEC
|
---|
| 487 | && type == SSL3_RT_HANDSHAKE && recvd_type != NULL)) {
|
---|
| 488 | /*
|
---|
| 489 | * SSL3_RT_APPLICATION_DATA or
|
---|
| 490 | * SSL3_RT_HANDSHAKE or
|
---|
| 491 | * SSL3_RT_CHANGE_CIPHER_SPEC
|
---|
| 492 | */
|
---|
| 493 | /*
|
---|
| 494 | * make sure that we are not getting application data when we are
|
---|
| 495 | * doing a handshake for the first time
|
---|
| 496 | */
|
---|
| 497 | if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
|
---|
| 498 | (s->enc_read_ctx == NULL)) {
|
---|
| 499 | al = SSL_AD_UNEXPECTED_MESSAGE;
|
---|
| 500 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_APP_DATA_IN_HANDSHAKE);
|
---|
| 501 | goto f_err;
|
---|
| 502 | }
|
---|
| 503 |
|
---|
| 504 | if (recvd_type != NULL)
|
---|
| 505 | *recvd_type = SSL3_RECORD_get_type(rr);
|
---|
| 506 |
|
---|
| 507 | if (len <= 0)
|
---|
| 508 | return (len);
|
---|
| 509 |
|
---|
| 510 | if ((unsigned int)len > SSL3_RECORD_get_length(rr))
|
---|
| 511 | n = SSL3_RECORD_get_length(rr);
|
---|
| 512 | else
|
---|
| 513 | n = (unsigned int)len;
|
---|
| 514 |
|
---|
| 515 | memcpy(buf, &(SSL3_RECORD_get_data(rr)[SSL3_RECORD_get_off(rr)]), n);
|
---|
| 516 | if (!peek) {
|
---|
| 517 | SSL3_RECORD_sub_length(rr, n);
|
---|
| 518 | SSL3_RECORD_add_off(rr, n);
|
---|
| 519 | if (SSL3_RECORD_get_length(rr) == 0) {
|
---|
| 520 | s->rlayer.rstate = SSL_ST_READ_HEADER;
|
---|
| 521 | SSL3_RECORD_set_off(rr, 0);
|
---|
| 522 | }
|
---|
| 523 | }
|
---|
| 524 | #ifndef OPENSSL_NO_SCTP
|
---|
| 525 | /*
|
---|
| 526 | * We were about to renegotiate but had to read belated application
|
---|
| 527 | * data first, so retry.
|
---|
| 528 | */
|
---|
| 529 | if (BIO_dgram_is_sctp(SSL_get_rbio(s)) &&
|
---|
| 530 | SSL3_RECORD_get_type(rr) == SSL3_RT_APPLICATION_DATA &&
|
---|
| 531 | ossl_statem_in_sctp_read_sock(s)) {
|
---|
| 532 | s->rwstate = SSL_READING;
|
---|
| 533 | BIO_clear_retry_flags(SSL_get_rbio(s));
|
---|
| 534 | BIO_set_retry_read(SSL_get_rbio(s));
|
---|
| 535 | }
|
---|
| 536 |
|
---|
| 537 | /*
|
---|
| 538 | * We might had to delay a close_notify alert because of reordered
|
---|
| 539 | * app data. If there was an alert and there is no message to read
|
---|
| 540 | * anymore, finally set shutdown.
|
---|
| 541 | */
|
---|
| 542 | if (BIO_dgram_is_sctp(SSL_get_rbio(s)) &&
|
---|
| 543 | s->d1->shutdown_received
|
---|
| 544 | && !BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
|
---|
| 545 | s->shutdown |= SSL_RECEIVED_SHUTDOWN;
|
---|
| 546 | return (0);
|
---|
| 547 | }
|
---|
| 548 | #endif
|
---|
| 549 | return (n);
|
---|
| 550 | }
|
---|
| 551 |
|
---|
| 552 | /*
|
---|
| 553 | * If we get here, then type != rr->type; if we have a handshake message,
|
---|
| 554 | * then it was unexpected (Hello Request or Client Hello).
|
---|
| 555 | */
|
---|
| 556 |
|
---|
| 557 | /*
|
---|
| 558 | * In case of record types for which we have 'fragment' storage, fill
|
---|
| 559 | * that so that we can process the data at a fixed place.
|
---|
| 560 | */
|
---|
| 561 | {
|
---|
| 562 | unsigned int k, dest_maxlen = 0;
|
---|
| 563 | unsigned char *dest = NULL;
|
---|
| 564 | unsigned int *dest_len = NULL;
|
---|
| 565 |
|
---|
| 566 | if (SSL3_RECORD_get_type(rr) == SSL3_RT_HANDSHAKE) {
|
---|
| 567 | dest_maxlen = sizeof s->rlayer.d->handshake_fragment;
|
---|
| 568 | dest = s->rlayer.d->handshake_fragment;
|
---|
| 569 | dest_len = &s->rlayer.d->handshake_fragment_len;
|
---|
| 570 | } else if (SSL3_RECORD_get_type(rr) == SSL3_RT_ALERT) {
|
---|
| 571 | dest_maxlen = sizeof(s->rlayer.d->alert_fragment);
|
---|
| 572 | dest = s->rlayer.d->alert_fragment;
|
---|
| 573 | dest_len = &s->rlayer.d->alert_fragment_len;
|
---|
| 574 | }
|
---|
| 575 | #ifndef OPENSSL_NO_HEARTBEATS
|
---|
| 576 | else if (SSL3_RECORD_get_type(rr) == DTLS1_RT_HEARTBEAT) {
|
---|
| 577 | /* We allow a 0 return */
|
---|
| 578 | if (dtls1_process_heartbeat(s, SSL3_RECORD_get_data(rr),
|
---|
| 579 | SSL3_RECORD_get_length(rr)) < 0) {
|
---|
| 580 | return -1;
|
---|
| 581 | }
|
---|
| 582 | /* Exit and notify application to read again */
|
---|
| 583 | SSL3_RECORD_set_length(rr, 0);
|
---|
| 584 | s->rwstate = SSL_READING;
|
---|
| 585 | BIO_clear_retry_flags(SSL_get_rbio(s));
|
---|
| 586 | BIO_set_retry_read(SSL_get_rbio(s));
|
---|
| 587 | return (-1);
|
---|
| 588 | }
|
---|
| 589 | #endif
|
---|
| 590 | /* else it's a CCS message, or application data or wrong */
|
---|
| 591 | else if (SSL3_RECORD_get_type(rr) != SSL3_RT_CHANGE_CIPHER_SPEC) {
|
---|
| 592 | /*
|
---|
| 593 | * Application data while renegotiating is allowed. Try again
|
---|
| 594 | * reading.
|
---|
| 595 | */
|
---|
| 596 | if (SSL3_RECORD_get_type(rr) == SSL3_RT_APPLICATION_DATA) {
|
---|
| 597 | BIO *bio;
|
---|
| 598 | s->s3->in_read_app_data = 2;
|
---|
| 599 | bio = SSL_get_rbio(s);
|
---|
| 600 | s->rwstate = SSL_READING;
|
---|
| 601 | BIO_clear_retry_flags(bio);
|
---|
| 602 | BIO_set_retry_read(bio);
|
---|
| 603 | return (-1);
|
---|
| 604 | }
|
---|
| 605 |
|
---|
| 606 | /* Not certain if this is the right error handling */
|
---|
| 607 | al = SSL_AD_UNEXPECTED_MESSAGE;
|
---|
| 608 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNEXPECTED_RECORD);
|
---|
| 609 | goto f_err;
|
---|
| 610 | }
|
---|
| 611 |
|
---|
| 612 | if (dest_maxlen > 0) {
|
---|
| 613 | /*
|
---|
| 614 | * XDTLS: In a pathological case, the Client Hello may be
|
---|
| 615 | * fragmented--don't always expect dest_maxlen bytes
|
---|
| 616 | */
|
---|
| 617 | if (SSL3_RECORD_get_length(rr) < dest_maxlen) {
|
---|
| 618 | #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
|
---|
| 619 | /*
|
---|
| 620 | * for normal alerts rr->length is 2, while
|
---|
| 621 | * dest_maxlen is 7 if we were to handle this
|
---|
| 622 | * non-existing alert...
|
---|
| 623 | */
|
---|
| 624 | FIX ME;
|
---|
| 625 | #endif
|
---|
| 626 | s->rlayer.rstate = SSL_ST_READ_HEADER;
|
---|
| 627 | SSL3_RECORD_set_length(rr, 0);
|
---|
| 628 | goto start;
|
---|
| 629 | }
|
---|
| 630 |
|
---|
| 631 | /* now move 'n' bytes: */
|
---|
| 632 | for (k = 0; k < dest_maxlen; k++) {
|
---|
| 633 | dest[k] = SSL3_RECORD_get_data(rr)[SSL3_RECORD_get_off(rr)];
|
---|
| 634 | SSL3_RECORD_add_off(rr, 1);
|
---|
| 635 | SSL3_RECORD_add_length(rr, -1);
|
---|
| 636 | }
|
---|
| 637 | *dest_len = dest_maxlen;
|
---|
| 638 | }
|
---|
| 639 | }
|
---|
| 640 |
|
---|
| 641 | /*-
|
---|
| 642 | * s->rlayer.d->handshake_fragment_len == 12 iff rr->type == SSL3_RT_HANDSHAKE;
|
---|
| 643 | * s->rlayer.d->alert_fragment_len == 7 iff rr->type == SSL3_RT_ALERT.
|
---|
| 644 | * (Possibly rr is 'empty' now, i.e. rr->length may be 0.)
|
---|
| 645 | */
|
---|
| 646 |
|
---|
| 647 | /* If we are a client, check for an incoming 'Hello Request': */
|
---|
| 648 | if ((!s->server) &&
|
---|
| 649 | (s->rlayer.d->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
|
---|
| 650 | (s->rlayer.d->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
|
---|
| 651 | (s->session != NULL) && (s->session->cipher != NULL)) {
|
---|
| 652 | s->rlayer.d->handshake_fragment_len = 0;
|
---|
| 653 |
|
---|
| 654 | if ((s->rlayer.d->handshake_fragment[1] != 0) ||
|
---|
| 655 | (s->rlayer.d->handshake_fragment[2] != 0) ||
|
---|
| 656 | (s->rlayer.d->handshake_fragment[3] != 0)) {
|
---|
| 657 | al = SSL_AD_DECODE_ERROR;
|
---|
| 658 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_BAD_HELLO_REQUEST);
|
---|
| 659 | goto f_err;
|
---|
| 660 | }
|
---|
| 661 |
|
---|
| 662 | /*
|
---|
| 663 | * no need to check sequence number on HELLO REQUEST messages
|
---|
| 664 | */
|
---|
| 665 |
|
---|
| 666 | if (s->msg_callback)
|
---|
| 667 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
|
---|
| 668 | s->rlayer.d->handshake_fragment, 4, s,
|
---|
| 669 | s->msg_callback_arg);
|
---|
| 670 |
|
---|
| 671 | if (SSL_is_init_finished(s) &&
|
---|
| 672 | !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
|
---|
| 673 | !s->s3->renegotiate) {
|
---|
| 674 | s->d1->handshake_read_seq++;
|
---|
| 675 | s->new_session = 1;
|
---|
| 676 | ssl3_renegotiate(s);
|
---|
| 677 | if (ssl3_renegotiate_check(s)) {
|
---|
| 678 | i = s->handshake_func(s);
|
---|
| 679 | if (i < 0)
|
---|
| 680 | return (i);
|
---|
| 681 | if (i == 0) {
|
---|
| 682 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE);
|
---|
| 683 | return (-1);
|
---|
| 684 | }
|
---|
| 685 |
|
---|
| 686 | if (!(s->mode & SSL_MODE_AUTO_RETRY)) {
|
---|
| 687 | if (SSL3_BUFFER_get_left(&s->rlayer.rbuf) == 0) {
|
---|
| 688 | /* no read-ahead left? */
|
---|
| 689 | BIO *bio;
|
---|
| 690 | /*
|
---|
| 691 | * In the case where we try to read application data,
|
---|
| 692 | * but we trigger an SSL handshake, we return -1 with
|
---|
| 693 | * the retry option set. Otherwise renegotiation may
|
---|
| 694 | * cause nasty problems in the blocking world
|
---|
| 695 | */
|
---|
| 696 | s->rwstate = SSL_READING;
|
---|
| 697 | bio = SSL_get_rbio(s);
|
---|
| 698 | BIO_clear_retry_flags(bio);
|
---|
| 699 | BIO_set_retry_read(bio);
|
---|
| 700 | return (-1);
|
---|
| 701 | }
|
---|
| 702 | }
|
---|
| 703 | }
|
---|
| 704 | }
|
---|
| 705 | /*
|
---|
| 706 | * we either finished a handshake or ignored the request, now try
|
---|
| 707 | * again to obtain the (application) data we were asked for
|
---|
| 708 | */
|
---|
| 709 | goto start;
|
---|
| 710 | }
|
---|
| 711 |
|
---|
| 712 | if (s->rlayer.d->alert_fragment_len >= DTLS1_AL_HEADER_LENGTH) {
|
---|
| 713 | int alert_level = s->rlayer.d->alert_fragment[0];
|
---|
| 714 | int alert_descr = s->rlayer.d->alert_fragment[1];
|
---|
| 715 |
|
---|
| 716 | s->rlayer.d->alert_fragment_len = 0;
|
---|
| 717 |
|
---|
| 718 | if (s->msg_callback)
|
---|
| 719 | s->msg_callback(0, s->version, SSL3_RT_ALERT,
|
---|
| 720 | s->rlayer.d->alert_fragment, 2, s,
|
---|
| 721 | s->msg_callback_arg);
|
---|
| 722 |
|
---|
| 723 | if (s->info_callback != NULL)
|
---|
| 724 | cb = s->info_callback;
|
---|
| 725 | else if (s->ctx->info_callback != NULL)
|
---|
| 726 | cb = s->ctx->info_callback;
|
---|
| 727 |
|
---|
| 728 | if (cb != NULL) {
|
---|
| 729 | j = (alert_level << 8) | alert_descr;
|
---|
| 730 | cb(s, SSL_CB_READ_ALERT, j);
|
---|
| 731 | }
|
---|
| 732 |
|
---|
| 733 | if (alert_level == SSL3_AL_WARNING) {
|
---|
| 734 | s->s3->warn_alert = alert_descr;
|
---|
| 735 |
|
---|
| 736 | s->rlayer.alert_count++;
|
---|
| 737 | if (s->rlayer.alert_count == MAX_WARN_ALERT_COUNT) {
|
---|
| 738 | al = SSL_AD_UNEXPECTED_MESSAGE;
|
---|
| 739 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_TOO_MANY_WARN_ALERTS);
|
---|
| 740 | goto f_err;
|
---|
| 741 | }
|
---|
| 742 |
|
---|
| 743 | if (alert_descr == SSL_AD_CLOSE_NOTIFY) {
|
---|
| 744 | #ifndef OPENSSL_NO_SCTP
|
---|
| 745 | /*
|
---|
| 746 | * With SCTP and streams the socket may deliver app data
|
---|
| 747 | * after a close_notify alert. We have to check this first so
|
---|
| 748 | * that nothing gets discarded.
|
---|
| 749 | */
|
---|
| 750 | if (BIO_dgram_is_sctp(SSL_get_rbio(s)) &&
|
---|
| 751 | BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
|
---|
| 752 | s->d1->shutdown_received = 1;
|
---|
| 753 | s->rwstate = SSL_READING;
|
---|
| 754 | BIO_clear_retry_flags(SSL_get_rbio(s));
|
---|
| 755 | BIO_set_retry_read(SSL_get_rbio(s));
|
---|
| 756 | return -1;
|
---|
| 757 | }
|
---|
| 758 | #endif
|
---|
| 759 | s->shutdown |= SSL_RECEIVED_SHUTDOWN;
|
---|
| 760 | return (0);
|
---|
| 761 | }
|
---|
| 762 | #if 0
|
---|
| 763 | /* XXX: this is a possible improvement in the future */
|
---|
| 764 | /* now check if it's a missing record */
|
---|
| 765 | if (alert_descr == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE) {
|
---|
| 766 | unsigned short seq;
|
---|
| 767 | unsigned int frag_off;
|
---|
| 768 | unsigned char *p = &(s->rlayer.d->alert_fragment[2]);
|
---|
| 769 |
|
---|
| 770 | n2s(p, seq);
|
---|
| 771 | n2l3(p, frag_off);
|
---|
| 772 |
|
---|
| 773 | dtls1_retransmit_message(s,
|
---|
| 774 | dtls1_get_queue_priority
|
---|
| 775 | (frag->msg_header.seq, 0), frag_off,
|
---|
| 776 | &found);
|
---|
| 777 | if (!found && SSL_in_init(s)) {
|
---|
| 778 | /*
|
---|
| 779 | * fprintf( stderr,"in init = %d\n", SSL_in_init(s));
|
---|
| 780 | */
|
---|
| 781 | /*
|
---|
| 782 | * requested a message not yet sent, send an alert
|
---|
| 783 | * ourselves
|
---|
| 784 | */
|
---|
| 785 | ssl3_send_alert(s, SSL3_AL_WARNING,
|
---|
| 786 | DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
|
---|
| 787 | }
|
---|
| 788 | }
|
---|
| 789 | #endif
|
---|
| 790 | } else if (alert_level == SSL3_AL_FATAL) {
|
---|
| 791 | char tmp[16];
|
---|
| 792 |
|
---|
| 793 | s->rwstate = SSL_NOTHING;
|
---|
| 794 | s->s3->fatal_alert = alert_descr;
|
---|
| 795 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr);
|
---|
| 796 | BIO_snprintf(tmp, sizeof tmp, "%d", alert_descr);
|
---|
| 797 | ERR_add_error_data(2, "SSL alert number ", tmp);
|
---|
| 798 | s->shutdown |= SSL_RECEIVED_SHUTDOWN;
|
---|
| 799 | SSL_CTX_remove_session(s->session_ctx, s->session);
|
---|
| 800 | return (0);
|
---|
| 801 | } else {
|
---|
| 802 | al = SSL_AD_ILLEGAL_PARAMETER;
|
---|
| 803 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNKNOWN_ALERT_TYPE);
|
---|
| 804 | goto f_err;
|
---|
| 805 | }
|
---|
| 806 |
|
---|
| 807 | goto start;
|
---|
| 808 | }
|
---|
| 809 |
|
---|
| 810 | if (s->shutdown & SSL_SENT_SHUTDOWN) { /* but we have not received a
|
---|
| 811 | * shutdown */
|
---|
| 812 | s->rwstate = SSL_NOTHING;
|
---|
| 813 | SSL3_RECORD_set_length(rr, 0);
|
---|
| 814 | return (0);
|
---|
| 815 | }
|
---|
| 816 |
|
---|
| 817 | if (SSL3_RECORD_get_type(rr) == SSL3_RT_CHANGE_CIPHER_SPEC) {
|
---|
| 818 | /*
|
---|
| 819 | * We can't process a CCS now, because previous handshake messages
|
---|
| 820 | * are still missing, so just drop it.
|
---|
| 821 | */
|
---|
| 822 | SSL3_RECORD_set_length(rr, 0);
|
---|
| 823 | goto start;
|
---|
| 824 | }
|
---|
| 825 |
|
---|
| 826 | /*
|
---|
| 827 | * Unexpected handshake message (Client Hello, or protocol violation)
|
---|
| 828 | */
|
---|
| 829 | if ((s->rlayer.d->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
|
---|
| 830 | !ossl_statem_get_in_handshake(s)) {
|
---|
| 831 | struct hm_header_st msg_hdr;
|
---|
| 832 |
|
---|
| 833 | /* this may just be a stale retransmit */
|
---|
| 834 | dtls1_get_message_header(rr->data, &msg_hdr);
|
---|
| 835 | if (SSL3_RECORD_get_epoch(rr) != s->rlayer.d->r_epoch) {
|
---|
| 836 | SSL3_RECORD_set_length(rr, 0);
|
---|
| 837 | goto start;
|
---|
| 838 | }
|
---|
| 839 |
|
---|
| 840 | /*
|
---|
| 841 | * If we are server, we may have a repeated FINISHED of the client
|
---|
| 842 | * here, then retransmit our CCS and FINISHED.
|
---|
| 843 | */
|
---|
| 844 | if (msg_hdr.type == SSL3_MT_FINISHED) {
|
---|
| 845 | if (dtls1_check_timeout_num(s) < 0)
|
---|
| 846 | return -1;
|
---|
| 847 |
|
---|
| 848 | dtls1_retransmit_buffered_messages(s);
|
---|
| 849 | SSL3_RECORD_set_length(rr, 0);
|
---|
| 850 | goto start;
|
---|
| 851 | }
|
---|
| 852 |
|
---|
| 853 | if (SSL_is_init_finished(s) &&
|
---|
| 854 | !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS)) {
|
---|
| 855 | ossl_statem_set_in_init(s, 1);
|
---|
| 856 | s->renegotiate = 1;
|
---|
| 857 | s->new_session = 1;
|
---|
| 858 | }
|
---|
| 859 | i = s->handshake_func(s);
|
---|
| 860 | if (i < 0)
|
---|
| 861 | return (i);
|
---|
| 862 | if (i == 0) {
|
---|
| 863 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE);
|
---|
| 864 | return (-1);
|
---|
| 865 | }
|
---|
| 866 |
|
---|
| 867 | if (!(s->mode & SSL_MODE_AUTO_RETRY)) {
|
---|
| 868 | if (SSL3_BUFFER_get_left(&s->rlayer.rbuf) == 0) {
|
---|
| 869 | /* no read-ahead left? */
|
---|
| 870 | BIO *bio;
|
---|
| 871 | /*
|
---|
| 872 | * In the case where we try to read application data, but we
|
---|
| 873 | * trigger an SSL handshake, we return -1 with the retry
|
---|
| 874 | * option set. Otherwise renegotiation may cause nasty
|
---|
| 875 | * problems in the blocking world
|
---|
| 876 | */
|
---|
| 877 | s->rwstate = SSL_READING;
|
---|
| 878 | bio = SSL_get_rbio(s);
|
---|
| 879 | BIO_clear_retry_flags(bio);
|
---|
| 880 | BIO_set_retry_read(bio);
|
---|
| 881 | return (-1);
|
---|
| 882 | }
|
---|
| 883 | }
|
---|
| 884 | goto start;
|
---|
| 885 | }
|
---|
| 886 |
|
---|
| 887 | switch (SSL3_RECORD_get_type(rr)) {
|
---|
| 888 | default:
|
---|
| 889 | /* TLS just ignores unknown message types */
|
---|
| 890 | if (s->version == TLS1_VERSION) {
|
---|
| 891 | SSL3_RECORD_set_length(rr, 0);
|
---|
| 892 | goto start;
|
---|
| 893 | }
|
---|
| 894 | al = SSL_AD_UNEXPECTED_MESSAGE;
|
---|
| 895 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNEXPECTED_RECORD);
|
---|
| 896 | goto f_err;
|
---|
| 897 | case SSL3_RT_CHANGE_CIPHER_SPEC:
|
---|
| 898 | case SSL3_RT_ALERT:
|
---|
| 899 | case SSL3_RT_HANDSHAKE:
|
---|
| 900 | /*
|
---|
| 901 | * we already handled all of these, with the possible exception of
|
---|
| 902 | * SSL3_RT_HANDSHAKE when ossl_statem_get_in_handshake(s) is true, but
|
---|
| 903 | * that should not happen when type != rr->type
|
---|
| 904 | */
|
---|
| 905 | al = SSL_AD_UNEXPECTED_MESSAGE;
|
---|
| 906 | SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR);
|
---|
| 907 | goto f_err;
|
---|
| 908 | case SSL3_RT_APPLICATION_DATA:
|
---|
| 909 | /*
|
---|
| 910 | * At this point, we were expecting handshake data, but have
|
---|
| 911 | * application data. If the library was running inside ssl3_read()
|
---|
| 912 | * (i.e. in_read_app_data is set) and it makes sense to read
|
---|
| 913 | * application data at this point (session renegotiation not yet
|
---|
| 914 | * started), we will indulge it.
|
---|
| 915 | */
|
---|
| 916 | if (s->s3->in_read_app_data &&
|
---|
| 917 | (s->s3->total_renegotiations != 0) &&
|
---|
| 918 | ossl_statem_app_data_allowed(s)) {
|
---|
| 919 | s->s3->in_read_app_data = 2;
|
---|
| 920 | return (-1);
|
---|
| 921 | } else {
|
---|
| 922 | al = SSL_AD_UNEXPECTED_MESSAGE;
|
---|
| 923 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNEXPECTED_RECORD);
|
---|
| 924 | goto f_err;
|
---|
| 925 | }
|
---|
| 926 | }
|
---|
| 927 | /* not reached */
|
---|
| 928 |
|
---|
| 929 | f_err:
|
---|
| 930 | ssl3_send_alert(s, SSL3_AL_FATAL, al);
|
---|
| 931 | return (-1);
|
---|
| 932 | }
|
---|
| 933 |
|
---|
| 934 | /*
|
---|
| 935 | * this only happens when a client hello is received and a handshake
|
---|
| 936 | * is started.
|
---|
| 937 | */
|
---|
| 938 | static int have_handshake_fragment(SSL *s, int type, unsigned char *buf,
|
---|
| 939 | int len)
|
---|
| 940 | {
|
---|
| 941 |
|
---|
| 942 | if ((type == SSL3_RT_HANDSHAKE)
|
---|
| 943 | && (s->rlayer.d->handshake_fragment_len > 0))
|
---|
| 944 | /* (partially) satisfy request from storage */
|
---|
| 945 | {
|
---|
| 946 | unsigned char *src = s->rlayer.d->handshake_fragment;
|
---|
| 947 | unsigned char *dst = buf;
|
---|
| 948 | unsigned int k, n;
|
---|
| 949 |
|
---|
| 950 | /* peek == 0 */
|
---|
| 951 | n = 0;
|
---|
| 952 | while ((len > 0) && (s->rlayer.d->handshake_fragment_len > 0)) {
|
---|
| 953 | *dst++ = *src++;
|
---|
| 954 | len--;
|
---|
| 955 | s->rlayer.d->handshake_fragment_len--;
|
---|
| 956 | n++;
|
---|
| 957 | }
|
---|
| 958 | /* move any remaining fragment bytes: */
|
---|
| 959 | for (k = 0; k < s->rlayer.d->handshake_fragment_len; k++)
|
---|
| 960 | s->rlayer.d->handshake_fragment[k] = *src++;
|
---|
| 961 | return n;
|
---|
| 962 | }
|
---|
| 963 |
|
---|
| 964 | return 0;
|
---|
| 965 | }
|
---|
| 966 |
|
---|
| 967 | /*
|
---|
| 968 | * Call this to write data in records of type 'type' It will return <= 0 if
|
---|
| 969 | * not all data has been sent or non-blocking IO.
|
---|
| 970 | */
|
---|
| 971 | int dtls1_write_bytes(SSL *s, int type, const void *buf, int len)
|
---|
| 972 | {
|
---|
| 973 | int i;
|
---|
| 974 |
|
---|
| 975 | OPENSSL_assert(len <= SSL3_RT_MAX_PLAIN_LENGTH);
|
---|
| 976 | s->rwstate = SSL_NOTHING;
|
---|
| 977 | i = do_dtls1_write(s, type, buf, len, 0);
|
---|
| 978 | return i;
|
---|
| 979 | }
|
---|
| 980 |
|
---|
| 981 | int do_dtls1_write(SSL *s, int type, const unsigned char *buf,
|
---|
| 982 | unsigned int len, int create_empty_fragment)
|
---|
| 983 | {
|
---|
| 984 | unsigned char *p, *pseq;
|
---|
| 985 | int i, mac_size, clear = 0;
|
---|
| 986 | int prefix_len = 0;
|
---|
| 987 | int eivlen;
|
---|
| 988 | SSL3_RECORD wr;
|
---|
| 989 | SSL3_BUFFER *wb;
|
---|
| 990 | SSL_SESSION *sess;
|
---|
| 991 |
|
---|
| 992 | wb = &s->rlayer.wbuf[0];
|
---|
| 993 |
|
---|
| 994 | /*
|
---|
| 995 | * first check if there is a SSL3_BUFFER still being written out. This
|
---|
| 996 | * will happen with non blocking IO
|
---|
| 997 | */
|
---|
| 998 | if (SSL3_BUFFER_get_left(wb) != 0) {
|
---|
| 999 | OPENSSL_assert(0); /* XDTLS: want to see if we ever get here */
|
---|
| 1000 | return (ssl3_write_pending(s, type, buf, len));
|
---|
| 1001 | }
|
---|
| 1002 |
|
---|
| 1003 | /* If we have an alert to send, lets send it */
|
---|
| 1004 | if (s->s3->alert_dispatch) {
|
---|
| 1005 | i = s->method->ssl_dispatch_alert(s);
|
---|
| 1006 | if (i <= 0)
|
---|
| 1007 | return (i);
|
---|
| 1008 | /* if it went, fall through and send more stuff */
|
---|
| 1009 | }
|
---|
| 1010 |
|
---|
| 1011 | if (len == 0 && !create_empty_fragment)
|
---|
| 1012 | return 0;
|
---|
| 1013 |
|
---|
| 1014 | sess = s->session;
|
---|
| 1015 |
|
---|
| 1016 | if ((sess == NULL) ||
|
---|
| 1017 | (s->enc_write_ctx == NULL) || (EVP_MD_CTX_md(s->write_hash) == NULL))
|
---|
| 1018 | clear = 1;
|
---|
| 1019 |
|
---|
| 1020 | if (clear)
|
---|
| 1021 | mac_size = 0;
|
---|
| 1022 | else {
|
---|
| 1023 | mac_size = EVP_MD_CTX_size(s->write_hash);
|
---|
| 1024 | if (mac_size < 0)
|
---|
| 1025 | goto err;
|
---|
| 1026 | }
|
---|
| 1027 |
|
---|
| 1028 | p = SSL3_BUFFER_get_buf(wb) + prefix_len;
|
---|
| 1029 |
|
---|
| 1030 | /* write the header */
|
---|
| 1031 |
|
---|
| 1032 | *(p++) = type & 0xff;
|
---|
| 1033 | SSL3_RECORD_set_type(&wr, type);
|
---|
| 1034 | /*
|
---|
| 1035 | * Special case: for hello verify request, client version 1.0 and we
|
---|
| 1036 | * haven't decided which version to use yet send back using version 1.0
|
---|
| 1037 | * header: otherwise some clients will ignore it.
|
---|
| 1038 | */
|
---|
| 1039 | if (s->method->version == DTLS_ANY_VERSION &&
|
---|
| 1040 | s->max_proto_version != DTLS1_BAD_VER) {
|
---|
| 1041 | *(p++) = DTLS1_VERSION >> 8;
|
---|
| 1042 | *(p++) = DTLS1_VERSION & 0xff;
|
---|
| 1043 | } else {
|
---|
| 1044 | *(p++) = s->version >> 8;
|
---|
| 1045 | *(p++) = s->version & 0xff;
|
---|
| 1046 | }
|
---|
| 1047 |
|
---|
| 1048 | /* field where we are to write out packet epoch, seq num and len */
|
---|
| 1049 | pseq = p;
|
---|
| 1050 | p += 10;
|
---|
| 1051 |
|
---|
| 1052 | /* Explicit IV length, block ciphers appropriate version flag */
|
---|
| 1053 | if (s->enc_write_ctx) {
|
---|
| 1054 | int mode = EVP_CIPHER_CTX_mode(s->enc_write_ctx);
|
---|
| 1055 | if (mode == EVP_CIPH_CBC_MODE) {
|
---|
| 1056 | eivlen = EVP_CIPHER_CTX_iv_length(s->enc_write_ctx);
|
---|
| 1057 | if (eivlen <= 1)
|
---|
| 1058 | eivlen = 0;
|
---|
| 1059 | }
|
---|
| 1060 | /* Need explicit part of IV for GCM mode */
|
---|
| 1061 | else if (mode == EVP_CIPH_GCM_MODE)
|
---|
| 1062 | eivlen = EVP_GCM_TLS_EXPLICIT_IV_LEN;
|
---|
| 1063 | else if (mode == EVP_CIPH_CCM_MODE)
|
---|
| 1064 | eivlen = EVP_CCM_TLS_EXPLICIT_IV_LEN;
|
---|
| 1065 | else
|
---|
| 1066 | eivlen = 0;
|
---|
| 1067 | } else
|
---|
| 1068 | eivlen = 0;
|
---|
| 1069 |
|
---|
| 1070 | /* lets setup the record stuff. */
|
---|
| 1071 | SSL3_RECORD_set_data(&wr, p + eivlen); /* make room for IV in case of CBC */
|
---|
| 1072 | SSL3_RECORD_set_length(&wr, (int)len);
|
---|
| 1073 | SSL3_RECORD_set_input(&wr, (unsigned char *)buf);
|
---|
| 1074 |
|
---|
| 1075 | /*
|
---|
| 1076 | * we now 'read' from wr.input, wr.length bytes into wr.data
|
---|
| 1077 | */
|
---|
| 1078 |
|
---|
| 1079 | /* first we compress */
|
---|
| 1080 | if (s->compress != NULL) {
|
---|
| 1081 | if (!ssl3_do_compress(s, &wr)) {
|
---|
| 1082 | SSLerr(SSL_F_DO_DTLS1_WRITE, SSL_R_COMPRESSION_FAILURE);
|
---|
| 1083 | goto err;
|
---|
| 1084 | }
|
---|
| 1085 | } else {
|
---|
| 1086 | memcpy(SSL3_RECORD_get_data(&wr), SSL3_RECORD_get_input(&wr),
|
---|
| 1087 | SSL3_RECORD_get_length(&wr));
|
---|
| 1088 | SSL3_RECORD_reset_input(&wr);
|
---|
| 1089 | }
|
---|
| 1090 |
|
---|
| 1091 | /*
|
---|
| 1092 | * we should still have the output to wr.data and the input from
|
---|
| 1093 | * wr.input. Length should be wr.length. wr.data still points in the
|
---|
| 1094 | * wb->buf
|
---|
| 1095 | */
|
---|
| 1096 |
|
---|
| 1097 | if (mac_size != 0) {
|
---|
| 1098 | if (s->method->ssl3_enc->mac(s, &wr,
|
---|
| 1099 | &(p[SSL3_RECORD_get_length(&wr) + eivlen]),
|
---|
| 1100 | 1) < 0)
|
---|
| 1101 | goto err;
|
---|
| 1102 | SSL3_RECORD_add_length(&wr, mac_size);
|
---|
| 1103 | }
|
---|
| 1104 |
|
---|
| 1105 | /* this is true regardless of mac size */
|
---|
| 1106 | SSL3_RECORD_set_data(&wr, p);
|
---|
| 1107 | SSL3_RECORD_reset_input(&wr);
|
---|
| 1108 |
|
---|
| 1109 | if (eivlen)
|
---|
| 1110 | SSL3_RECORD_add_length(&wr, eivlen);
|
---|
| 1111 |
|
---|
| 1112 | if (s->method->ssl3_enc->enc(s, &wr, 1, 1) < 1)
|
---|
| 1113 | goto err;
|
---|
| 1114 |
|
---|
| 1115 | /* record length after mac and block padding */
|
---|
| 1116 | /*
|
---|
| 1117 | * if (type == SSL3_RT_APPLICATION_DATA || (type == SSL3_RT_ALERT && !
|
---|
| 1118 | * SSL_in_init(s)))
|
---|
| 1119 | */
|
---|
| 1120 |
|
---|
| 1121 | /* there's only one epoch between handshake and app data */
|
---|
| 1122 |
|
---|
| 1123 | s2n(s->rlayer.d->w_epoch, pseq);
|
---|
| 1124 |
|
---|
| 1125 | /* XDTLS: ?? */
|
---|
| 1126 | /*
|
---|
| 1127 | * else s2n(s->d1->handshake_epoch, pseq);
|
---|
| 1128 | */
|
---|
| 1129 |
|
---|
| 1130 | memcpy(pseq, &(s->rlayer.write_sequence[2]), 6);
|
---|
| 1131 | pseq += 6;
|
---|
| 1132 | s2n(SSL3_RECORD_get_length(&wr), pseq);
|
---|
| 1133 |
|
---|
| 1134 | if (s->msg_callback)
|
---|
| 1135 | s->msg_callback(1, 0, SSL3_RT_HEADER, pseq - DTLS1_RT_HEADER_LENGTH,
|
---|
| 1136 | DTLS1_RT_HEADER_LENGTH, s, s->msg_callback_arg);
|
---|
| 1137 |
|
---|
| 1138 | /*
|
---|
| 1139 | * we should now have wr.data pointing to the encrypted data, which is
|
---|
| 1140 | * wr->length long
|
---|
| 1141 | */
|
---|
| 1142 | SSL3_RECORD_set_type(&wr, type); /* not needed but helps for debugging */
|
---|
| 1143 | SSL3_RECORD_add_length(&wr, DTLS1_RT_HEADER_LENGTH);
|
---|
| 1144 |
|
---|
| 1145 | ssl3_record_sequence_update(&(s->rlayer.write_sequence[0]));
|
---|
| 1146 |
|
---|
| 1147 | if (create_empty_fragment) {
|
---|
| 1148 | /*
|
---|
| 1149 | * we are in a recursive call; just return the length, don't write
|
---|
| 1150 | * out anything here
|
---|
| 1151 | */
|
---|
| 1152 | return wr.length;
|
---|
| 1153 | }
|
---|
| 1154 |
|
---|
| 1155 | /* now let's set up wb */
|
---|
| 1156 | SSL3_BUFFER_set_left(wb, prefix_len + SSL3_RECORD_get_length(&wr));
|
---|
| 1157 | SSL3_BUFFER_set_offset(wb, 0);
|
---|
| 1158 |
|
---|
| 1159 | /*
|
---|
| 1160 | * memorize arguments so that ssl3_write_pending can detect bad write
|
---|
| 1161 | * retries later
|
---|
| 1162 | */
|
---|
| 1163 | s->rlayer.wpend_tot = len;
|
---|
| 1164 | s->rlayer.wpend_buf = buf;
|
---|
| 1165 | s->rlayer.wpend_type = type;
|
---|
| 1166 | s->rlayer.wpend_ret = len;
|
---|
| 1167 |
|
---|
| 1168 | /* we now just need to write the buffer */
|
---|
| 1169 | return ssl3_write_pending(s, type, buf, len);
|
---|
| 1170 | err:
|
---|
| 1171 | return -1;
|
---|
| 1172 | }
|
---|
| 1173 |
|
---|
| 1174 | DTLS1_BITMAP *dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr,
|
---|
| 1175 | unsigned int *is_next_epoch)
|
---|
| 1176 | {
|
---|
| 1177 |
|
---|
| 1178 | *is_next_epoch = 0;
|
---|
| 1179 |
|
---|
| 1180 | /* In current epoch, accept HM, CCS, DATA, & ALERT */
|
---|
| 1181 | if (rr->epoch == s->rlayer.d->r_epoch)
|
---|
| 1182 | return &s->rlayer.d->bitmap;
|
---|
| 1183 |
|
---|
| 1184 | /*
|
---|
| 1185 | * Only HM and ALERT messages can be from the next epoch and only if we
|
---|
| 1186 | * have already processed all of the unprocessed records from the last
|
---|
| 1187 | * epoch
|
---|
| 1188 | */
|
---|
| 1189 | else if (rr->epoch == (unsigned long)(s->rlayer.d->r_epoch + 1) &&
|
---|
| 1190 | s->rlayer.d->unprocessed_rcds.epoch != s->rlayer.d->r_epoch &&
|
---|
| 1191 | (rr->type == SSL3_RT_HANDSHAKE || rr->type == SSL3_RT_ALERT)) {
|
---|
| 1192 | *is_next_epoch = 1;
|
---|
| 1193 | return &s->rlayer.d->next_bitmap;
|
---|
| 1194 | }
|
---|
| 1195 |
|
---|
| 1196 | return NULL;
|
---|
| 1197 | }
|
---|
| 1198 |
|
---|
| 1199 | void dtls1_reset_seq_numbers(SSL *s, int rw)
|
---|
| 1200 | {
|
---|
| 1201 | unsigned char *seq;
|
---|
| 1202 | unsigned int seq_bytes = sizeof(s->rlayer.read_sequence);
|
---|
| 1203 |
|
---|
| 1204 | if (rw & SSL3_CC_READ) {
|
---|
| 1205 | seq = s->rlayer.read_sequence;
|
---|
| 1206 | s->rlayer.d->r_epoch++;
|
---|
| 1207 | memcpy(&s->rlayer.d->bitmap, &s->rlayer.d->next_bitmap,
|
---|
| 1208 | sizeof(s->rlayer.d->bitmap));
|
---|
| 1209 | memset(&s->rlayer.d->next_bitmap, 0, sizeof(s->rlayer.d->next_bitmap));
|
---|
| 1210 |
|
---|
| 1211 | /*
|
---|
| 1212 | * We must not use any buffered messages received from the previous
|
---|
| 1213 | * epoch
|
---|
| 1214 | */
|
---|
| 1215 | dtls1_clear_received_buffer(s);
|
---|
| 1216 | } else {
|
---|
| 1217 | seq = s->rlayer.write_sequence;
|
---|
| 1218 | memcpy(s->rlayer.d->last_write_sequence, seq,
|
---|
| 1219 | sizeof(s->rlayer.write_sequence));
|
---|
| 1220 | s->rlayer.d->w_epoch++;
|
---|
| 1221 | }
|
---|
| 1222 |
|
---|
| 1223 | memset(seq, 0, seq_bytes);
|
---|
| 1224 | }
|
---|