[331] | 1 | /*
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| 2 | * Copyright 1995-2016 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 "../ssl_locl.h"
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| 11 | #include "record_locl.h"
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| 12 |
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| 13 | void SSL3_BUFFER_set_data(SSL3_BUFFER *b, const unsigned char *d, int n)
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| 14 | {
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| 15 | if (d != NULL)
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| 16 | memcpy(b->buf, d, n);
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| 17 | b->left = n;
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| 18 | b->offset = 0;
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| 19 | }
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| 20 |
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| 21 | /*
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| 22 | * Clear the contents of an SSL3_BUFFER but retain any memory allocated. Also
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| 23 | * retains the default_len setting
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| 24 | */
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| 25 | void SSL3_BUFFER_clear(SSL3_BUFFER *b)
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| 26 | {
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| 27 | b->offset = 0;
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| 28 | b->left = 0;
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| 29 | }
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| 30 |
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| 31 | void SSL3_BUFFER_release(SSL3_BUFFER *b)
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| 32 | {
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| 33 | OPENSSL_free(b->buf);
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| 34 | b->buf = NULL;
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| 35 | }
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| 36 |
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| 37 | int ssl3_setup_read_buffer(SSL *s)
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| 38 | {
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| 39 | unsigned char *p;
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| 40 | size_t len, align = 0, headerlen;
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| 41 | SSL3_BUFFER *b;
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| 42 |
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| 43 | b = RECORD_LAYER_get_rbuf(&s->rlayer);
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| 44 |
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| 45 | if (SSL_IS_DTLS(s))
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| 46 | headerlen = DTLS1_RT_HEADER_LENGTH;
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| 47 | else
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| 48 | headerlen = SSL3_RT_HEADER_LENGTH;
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| 49 |
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| 50 | #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
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| 51 | align = (-SSL3_RT_HEADER_LENGTH) & (SSL3_ALIGN_PAYLOAD - 1);
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| 52 | #endif
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| 53 |
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| 54 | if (b->buf == NULL) {
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| 55 | len = SSL3_RT_MAX_PLAIN_LENGTH
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| 56 | + SSL3_RT_MAX_ENCRYPTED_OVERHEAD + headerlen + align;
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| 57 | #ifndef OPENSSL_NO_COMP
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| 58 | if (ssl_allow_compression(s))
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| 59 | len += SSL3_RT_MAX_COMPRESSED_OVERHEAD;
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| 60 | #endif
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| 61 | if (b->default_len > len)
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| 62 | len = b->default_len;
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| 63 | if ((p = OPENSSL_malloc(len)) == NULL)
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| 64 | goto err;
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| 65 | b->buf = p;
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| 66 | b->len = len;
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| 67 | }
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| 68 |
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| 69 | RECORD_LAYER_set_packet(&s->rlayer, &(b->buf[0]));
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| 70 | return 1;
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| 71 |
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| 72 | err:
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| 73 | SSLerr(SSL_F_SSL3_SETUP_READ_BUFFER, ERR_R_MALLOC_FAILURE);
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| 74 | return 0;
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| 75 | }
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| 76 |
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| 77 | int ssl3_setup_write_buffer(SSL *s, unsigned int numwpipes, size_t len)
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| 78 | {
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| 79 | unsigned char *p;
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| 80 | size_t align = 0, headerlen;
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| 81 | SSL3_BUFFER *wb;
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| 82 | unsigned int currpipe;
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| 83 |
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| 84 | s->rlayer.numwpipes = numwpipes;
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| 85 |
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| 86 | if (len == 0) {
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| 87 | if (SSL_IS_DTLS(s))
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| 88 | headerlen = DTLS1_RT_HEADER_LENGTH + 1;
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| 89 | else
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| 90 | headerlen = SSL3_RT_HEADER_LENGTH;
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| 91 |
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| 92 | #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
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| 93 | align = (-SSL3_RT_HEADER_LENGTH) & (SSL3_ALIGN_PAYLOAD - 1);
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| 94 | #endif
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| 95 |
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| 96 | len = s->max_send_fragment
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| 97 | + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD + headerlen + align;
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| 98 | #ifndef OPENSSL_NO_COMP
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| 99 | if (ssl_allow_compression(s))
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| 100 | len += SSL3_RT_MAX_COMPRESSED_OVERHEAD;
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| 101 | #endif
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| 102 | if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
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| 103 | len += headerlen + align + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD;
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| 104 | }
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| 105 |
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| 106 | wb = RECORD_LAYER_get_wbuf(&s->rlayer);
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| 107 | for (currpipe = 0; currpipe < numwpipes; currpipe++) {
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| 108 | SSL3_BUFFER *thiswb = &wb[currpipe];
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| 109 |
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| 110 | if (thiswb->buf == NULL) {
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| 111 | p = OPENSSL_malloc(len);
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| 112 | if (p == NULL) {
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| 113 | s->rlayer.numwpipes = currpipe;
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| 114 | goto err;
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| 115 | }
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| 116 | memset(thiswb, 0, sizeof(SSL3_BUFFER));
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| 117 | thiswb->buf = p;
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| 118 | thiswb->len = len;
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| 119 | }
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| 120 | }
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| 121 |
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| 122 | return 1;
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| 123 |
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| 124 | err:
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| 125 | SSLerr(SSL_F_SSL3_SETUP_WRITE_BUFFER, ERR_R_MALLOC_FAILURE);
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| 126 | return 0;
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| 127 | }
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| 128 |
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| 129 | int ssl3_setup_buffers(SSL *s)
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| 130 | {
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| 131 | if (!ssl3_setup_read_buffer(s))
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| 132 | return 0;
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| 133 | if (!ssl3_setup_write_buffer(s, 1, 0))
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| 134 | return 0;
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| 135 | return 1;
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| 136 | }
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| 137 |
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| 138 | int ssl3_release_write_buffer(SSL *s)
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| 139 | {
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| 140 | SSL3_BUFFER *wb;
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| 141 | unsigned int pipes;
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| 142 |
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| 143 | pipes = s->rlayer.numwpipes;
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| 144 | while (pipes > 0) {
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| 145 | wb = &RECORD_LAYER_get_wbuf(&s->rlayer)[pipes - 1];
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| 146 |
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| 147 | OPENSSL_free(wb->buf);
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| 148 | wb->buf = NULL;
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| 149 | pipes--;
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| 150 | }
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| 151 | s->rlayer.numwpipes = 0;
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| 152 | return 1;
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| 153 | }
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| 154 |
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| 155 | int ssl3_release_read_buffer(SSL *s)
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| 156 | {
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| 157 | SSL3_BUFFER *b;
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| 158 |
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| 159 | b = RECORD_LAYER_get_rbuf(&s->rlayer);
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| 160 | OPENSSL_free(b->buf);
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| 161 | b->buf = NULL;
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| 162 | return 1;
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| 163 | }
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