1 /*
2 * Copyright 1995-2023 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 #include "../ssl_local.h"
11 #include "record_local.h"
12
SSL3_BUFFER_set_data(SSL3_BUFFER * b,const unsigned char * d,size_t n)13 void SSL3_BUFFER_set_data(SSL3_BUFFER *b, const unsigned char *d, size_t n)
14 {
15 if (d != NULL)
16 memcpy(b->buf, d, n);
17 b->left = n;
18 b->offset = 0;
19 }
20
21 /*
22 * Clear the contents of an SSL3_BUFFER but retain any memory allocated. Also
23 * retains the default_len setting
24 */
SSL3_BUFFER_clear(SSL3_BUFFER * b)25 void SSL3_BUFFER_clear(SSL3_BUFFER *b)
26 {
27 b->offset = 0;
28 b->left = 0;
29 }
30
SSL3_BUFFER_release(SSL3_BUFFER * b)31 void SSL3_BUFFER_release(SSL3_BUFFER *b)
32 {
33 OPENSSL_free(b->buf);
34 b->buf = NULL;
35 }
36
ssl3_setup_read_buffer(SSL * s)37 int ssl3_setup_read_buffer(SSL *s)
38 {
39 unsigned char *p;
40 size_t len, align = 0, headerlen;
41 SSL3_BUFFER *b;
42
43 b = RECORD_LAYER_get_rbuf(&s->rlayer);
44
45 if (SSL_IS_DTLS(s))
46 headerlen = DTLS1_RT_HEADER_LENGTH;
47 else
48 headerlen = SSL3_RT_HEADER_LENGTH;
49
50 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
51 align = (-SSL3_RT_HEADER_LENGTH) & (SSL3_ALIGN_PAYLOAD - 1);
52 #endif
53
54 if (b->buf == NULL) {
55 len = SSL3_RT_MAX_PLAIN_LENGTH
56 + SSL3_RT_MAX_ENCRYPTED_OVERHEAD + headerlen + align;
57 #ifndef OPENSSL_NO_COMP
58 if (ssl_allow_compression(s))
59 len += SSL3_RT_MAX_COMPRESSED_OVERHEAD;
60 #endif
61 if (b->default_len > len)
62 len = b->default_len;
63 if ((p = OPENSSL_malloc(len)) == NULL) {
64 /*
65 * We've got a malloc failure, and we're still initialising buffers.
66 * We assume we're so doomed that we won't even be able to send an
67 * alert.
68 */
69 SSLfatal(s, SSL_AD_NO_ALERT, SSL_F_SSL3_SETUP_READ_BUFFER,
70 ERR_R_MALLOC_FAILURE);
71 return 0;
72 }
73 b->buf = p;
74 b->len = len;
75 }
76
77 return 1;
78 }
79
ssl3_setup_write_buffer(SSL * s,size_t numwpipes,size_t len)80 int ssl3_setup_write_buffer(SSL *s, size_t numwpipes, size_t len)
81 {
82 unsigned char *p;
83 size_t align = 0, headerlen;
84 SSL3_BUFFER *wb;
85 size_t currpipe;
86
87 s->rlayer.numwpipes = numwpipes;
88
89 if (len == 0) {
90 if (SSL_IS_DTLS(s))
91 headerlen = DTLS1_RT_HEADER_LENGTH + 1;
92 else
93 headerlen = SSL3_RT_HEADER_LENGTH;
94
95 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
96 align = SSL3_ALIGN_PAYLOAD - 1;
97 #endif
98
99 len = ssl_get_max_send_fragment(s)
100 + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD + headerlen + align
101 + SSL_RT_MAX_CIPHER_BLOCK_SIZE /* Explicit IV allowance */;
102 #ifndef OPENSSL_NO_COMP
103 if (ssl_allow_compression(s))
104 len += SSL3_RT_MAX_COMPRESSED_OVERHEAD;
105 #endif
106 /*
107 * We don't need to add an allowance for eivlen here since empty
108 * fragments only occur when we don't have an explicit IV
109 */
110 if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
111 len += headerlen + align + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD;
112 }
113
114 wb = RECORD_LAYER_get_wbuf(&s->rlayer);
115 for (currpipe = 0; currpipe < numwpipes; currpipe++) {
116 SSL3_BUFFER *thiswb = &wb[currpipe];
117
118 if (thiswb->buf != NULL && thiswb->len != len) {
119 OPENSSL_free(thiswb->buf);
120 thiswb->buf = NULL; /* force reallocation */
121 }
122
123 if (thiswb->buf == NULL) {
124 p = OPENSSL_malloc(len);
125 if (p == NULL) {
126 s->rlayer.numwpipes = currpipe;
127 /*
128 * We've got a malloc failure, and we're still initialising
129 * buffers. We assume we're so doomed that we won't even be able
130 * to send an alert.
131 */
132 SSLfatal(s, SSL_AD_NO_ALERT,
133 SSL_F_SSL3_SETUP_WRITE_BUFFER, ERR_R_MALLOC_FAILURE);
134 return 0;
135 }
136 memset(thiswb, 0, sizeof(SSL3_BUFFER));
137 thiswb->buf = p;
138 thiswb->len = len;
139 }
140 }
141
142 return 1;
143 }
144
ssl3_setup_buffers(SSL * s)145 int ssl3_setup_buffers(SSL *s)
146 {
147 if (!ssl3_setup_read_buffer(s)) {
148 /* SSLfatal() already called */
149 return 0;
150 }
151 if (!ssl3_setup_write_buffer(s, 1, 0)) {
152 /* SSLfatal() already called */
153 return 0;
154 }
155 return 1;
156 }
157
ssl3_release_write_buffer(SSL * s)158 int ssl3_release_write_buffer(SSL *s)
159 {
160 SSL3_BUFFER *wb;
161 size_t pipes;
162
163 pipes = s->rlayer.numwpipes;
164 while (pipes > 0) {
165 wb = &RECORD_LAYER_get_wbuf(&s->rlayer)[pipes - 1];
166
167 OPENSSL_free(wb->buf);
168 wb->buf = NULL;
169 pipes--;
170 }
171 s->rlayer.numwpipes = 0;
172 return 1;
173 }
174
ssl3_release_read_buffer(SSL * s)175 int ssl3_release_read_buffer(SSL *s)
176 {
177 SSL3_BUFFER *b;
178
179 b = RECORD_LAYER_get_rbuf(&s->rlayer);
180 OPENSSL_free(b->buf);
181 b->buf = NULL;
182 return 1;
183 }
184