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1 | /* ssl/d1_enc.c */ |
2 | /* | |
3 | * DTLS implementation written by Nagendra Modadugu | |
4 | * (nagendra@cs.stanford.edu) for the OpenSSL project 2005. | |
5 | */ | |
6 | /* ==================================================================== | |
7 | * Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved. | |
8 | * | |
9 | * Redistribution and use in source and binary forms, with or without | |
10 | * modification, are permitted provided that the following conditions | |
11 | * are met: | |
12 | * | |
13 | * 1. Redistributions of source code must retain the above copyright | |
14 | * notice, this list of conditions and the following disclaimer. | |
15 | * | |
16 | * 2. Redistributions in binary form must reproduce the above copyright | |
17 | * notice, this list of conditions and the following disclaimer in | |
18 | * the documentation and/or other materials provided with the | |
19 | * distribution. | |
20 | * | |
21 | * 3. All advertising materials mentioning features or use of this | |
22 | * software must display the following acknowledgment: | |
23 | * "This product includes software developed by the OpenSSL Project | |
24 | * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" | |
25 | * | |
26 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
27 | * endorse or promote products derived from this software without | |
28 | * prior written permission. For written permission, please contact | |
29 | * openssl-core@openssl.org. | |
30 | * | |
31 | * 5. Products derived from this software may not be called "OpenSSL" | |
32 | * nor may "OpenSSL" appear in their names without prior written | |
33 | * permission of the OpenSSL Project. | |
34 | * | |
35 | * 6. Redistributions of any form whatsoever must retain the following | |
36 | * acknowledgment: | |
37 | * "This product includes software developed by the OpenSSL Project | |
38 | * for use in the OpenSSL Toolkit (http://www.openssl.org/)" | |
39 | * | |
40 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
41 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
42 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
43 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
44 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
45 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
46 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
47 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
49 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
50 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
51 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
52 | * ==================================================================== | |
53 | * | |
54 | * This product includes cryptographic software written by Eric Young | |
55 | * (eay@cryptsoft.com). This product includes software written by Tim | |
56 | * Hudson (tjh@cryptsoft.com). | |
57 | * | |
58 | */ | |
59 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) | |
60 | * All rights reserved. | |
61 | * | |
62 | * This package is an SSL implementation written | |
63 | * by Eric Young (eay@cryptsoft.com). | |
64 | * The implementation was written so as to conform with Netscapes SSL. | |
65 | * | |
66 | * This library is free for commercial and non-commercial use as long as | |
67 | * the following conditions are aheared to. The following conditions | |
68 | * apply to all code found in this distribution, be it the RC4, RSA, | |
69 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
70 | * included with this distribution is covered by the same copyright terms | |
71 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
72 | * | |
73 | * Copyright remains Eric Young's, and as such any Copyright notices in | |
74 | * the code are not to be removed. | |
75 | * If this package is used in a product, Eric Young should be given attribution | |
76 | * as the author of the parts of the library used. | |
77 | * This can be in the form of a textual message at program startup or | |
78 | * in documentation (online or textual) provided with the package. | |
79 | * | |
80 | * Redistribution and use in source and binary forms, with or without | |
81 | * modification, are permitted provided that the following conditions | |
82 | * are met: | |
83 | * 1. Redistributions of source code must retain the copyright | |
84 | * notice, this list of conditions and the following disclaimer. | |
85 | * 2. Redistributions in binary form must reproduce the above copyright | |
86 | * notice, this list of conditions and the following disclaimer in the | |
87 | * documentation and/or other materials provided with the distribution. | |
88 | * 3. All advertising materials mentioning features or use of this software | |
89 | * must display the following acknowledgement: | |
90 | * "This product includes cryptographic software written by | |
91 | * Eric Young (eay@cryptsoft.com)" | |
92 | * The word 'cryptographic' can be left out if the rouines from the library | |
93 | * being used are not cryptographic related :-). | |
94 | * 4. If you include any Windows specific code (or a derivative thereof) from | |
95 | * the apps directory (application code) you must include an acknowledgement: | |
96 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
97 | * | |
98 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND | |
99 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
100 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
101 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
102 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
103 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
104 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
105 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
106 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
107 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
108 | * SUCH DAMAGE. | |
109 | * | |
110 | * The licence and distribution terms for any publically available version or | |
111 | * derivative of this code cannot be changed. i.e. this code cannot simply be | |
112 | * copied and put under another distribution licence | |
113 | * [including the GNU Public Licence.] | |
114 | */ | |
115 | ||
116 | #include <stdio.h> | |
117 | #include "ssl_locl.h" | |
fceac0bc | 118 | #ifndef OPENSSL_NO_COMP |
36d16f8e | 119 | #include <openssl/comp.h> |
fceac0bc | 120 | #endif |
36d16f8e BL |
121 | #include <openssl/evp.h> |
122 | #include <openssl/hmac.h> | |
123 | #include <openssl/md5.h> | |
124 | #include <openssl/rand.h> | |
0e1dba93 DSH |
125 | #ifdef KSSL_DEBUG |
126 | #include <openssl/des.h> | |
127 | #endif | |
36d16f8e BL |
128 | |
129 | int dtls1_enc(SSL *s, int send) | |
130 | { | |
131 | SSL3_RECORD *rec; | |
132 | EVP_CIPHER_CTX *ds; | |
133 | unsigned long l; | |
134 | int bs,i,ii,j,k,n=0; | |
135 | const EVP_CIPHER *enc; | |
136 | ||
137 | if (send) | |
138 | { | |
b948e2c5 | 139 | if (EVP_MD_CTX_md(s->write_hash)) |
0eab41fb | 140 | { |
b948e2c5 | 141 | n=EVP_MD_CTX_size(s->write_hash); |
0eab41fb BL |
142 | if (n < 0) |
143 | return -1; | |
144 | } | |
36d16f8e BL |
145 | ds=s->enc_write_ctx; |
146 | rec= &(s->s3->wrec); | |
147 | if (s->enc_write_ctx == NULL) | |
148 | enc=NULL; | |
149 | else | |
150 | { | |
151 | enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx); | |
152 | if ( rec->data != rec->input) | |
153 | /* we can't write into the input stream */ | |
154 | fprintf(stderr, "%s:%d: rec->data != rec->input\n", | |
155 | __FILE__, __LINE__); | |
156 | else if ( EVP_CIPHER_block_size(ds->cipher) > 1) | |
8c5a2bd6 | 157 | { |
a25f33d2 | 158 | if (RAND_bytes(rec->input, EVP_CIPHER_block_size(ds->cipher)) <= 0) |
8c5a2bd6 NL |
159 | return -1; |
160 | } | |
36d16f8e BL |
161 | } |
162 | } | |
163 | else | |
164 | { | |
b948e2c5 | 165 | if (EVP_MD_CTX_md(s->read_hash)) |
0eab41fb | 166 | { |
b948e2c5 | 167 | n=EVP_MD_CTX_size(s->read_hash); |
0eab41fb BL |
168 | if (n < 0) |
169 | return -1; | |
170 | } | |
36d16f8e BL |
171 | ds=s->enc_read_ctx; |
172 | rec= &(s->s3->rrec); | |
173 | if (s->enc_read_ctx == NULL) | |
174 | enc=NULL; | |
175 | else | |
176 | enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx); | |
177 | } | |
178 | ||
179 | #ifdef KSSL_DEBUG | |
180 | printf("dtls1_enc(%d)\n", send); | |
181 | #endif /* KSSL_DEBUG */ | |
182 | ||
183 | if ((s->session == NULL) || (ds == NULL) || | |
184 | (enc == NULL)) | |
185 | { | |
186 | memmove(rec->data,rec->input,rec->length); | |
187 | rec->input=rec->data; | |
188 | } | |
189 | else | |
190 | { | |
191 | l=rec->length; | |
192 | bs=EVP_CIPHER_block_size(ds->cipher); | |
193 | ||
194 | if ((bs != 1) && send) | |
195 | { | |
196 | i=bs-((int)l%bs); | |
197 | ||
198 | /* Add weird padding of upto 256 bytes */ | |
199 | ||
200 | /* we need to add 'i' padding bytes of value j */ | |
201 | j=i-1; | |
202 | if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG) | |
203 | { | |
204 | if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG) | |
205 | j++; | |
206 | } | |
207 | for (k=(int)l; k<(int)(l+i); k++) | |
208 | rec->input[k]=j; | |
209 | l+=i; | |
210 | rec->length+=i; | |
211 | } | |
212 | ||
213 | #ifdef KSSL_DEBUG | |
214 | { | |
215 | unsigned long ui; | |
216 | printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n", | |
6343829a GT |
217 | ds,rec->data,rec->input,l); |
218 | printf("\tEVP_CIPHER_CTX: %d buf_len, %d key_len [%d %d], %d iv_len\n", | |
219 | ds->buf_len, ds->cipher->key_len, | |
220 | DES_KEY_SZ, DES_SCHEDULE_SZ, | |
221 | ds->cipher->iv_len); | |
36d16f8e BL |
222 | printf("\t\tIV: "); |
223 | for (i=0; i<ds->cipher->iv_len; i++) printf("%02X", ds->iv[i]); | |
224 | printf("\n"); | |
225 | printf("\trec->input="); | |
226 | for (ui=0; ui<l; ui++) printf(" %02x", rec->input[ui]); | |
227 | printf("\n"); | |
228 | } | |
229 | #endif /* KSSL_DEBUG */ | |
230 | ||
231 | if (!send) | |
232 | { | |
233 | if (l == 0 || l%bs != 0) | |
a4757716 | 234 | return -1; |
36d16f8e BL |
235 | } |
236 | ||
237 | EVP_Cipher(ds,rec->data,rec->input,l); | |
238 | ||
239 | #ifdef KSSL_DEBUG | |
240 | { | |
6343829a | 241 | unsigned long i; |
36d16f8e | 242 | printf("\trec->data="); |
6343829a GT |
243 | for (i=0; i<l; i++) |
244 | printf(" %02x", rec->data[i]); printf("\n"); | |
36d16f8e BL |
245 | } |
246 | #endif /* KSSL_DEBUG */ | |
247 | ||
248 | if ((bs != 1) && !send) | |
249 | { | |
250 | ii=i=rec->data[l-1]; /* padding_length */ | |
251 | i++; | |
252 | if (s->options&SSL_OP_TLS_BLOCK_PADDING_BUG) | |
253 | { | |
254 | /* First packet is even in size, so check */ | |
255 | if ((memcmp(s->s3->read_sequence, | |
256 | "\0\0\0\0\0\0\0\0",8) == 0) && !(ii & 1)) | |
257 | s->s3->flags|=TLS1_FLAGS_TLS_PADDING_BUG; | |
258 | if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG) | |
259 | i--; | |
260 | } | |
261 | /* TLS 1.0 does not bound the number of padding bytes by the block size. | |
262 | * All of them must have value 'padding_length'. */ | |
c46ecc3a | 263 | if (i + bs > (int)rec->length) |
36d16f8e BL |
264 | { |
265 | /* Incorrect padding. SSLerr() and ssl3_alert are done | |
266 | * by caller: we don't want to reveal whether this is | |
267 | * a decryption error or a MAC verification failure | |
268 | * (see http://www.openssl.org/~bodo/tls-cbc.txt) | |
269 | */ | |
270 | return -1; | |
271 | } | |
272 | for (j=(int)(l-i); j<(int)l; j++) | |
273 | { | |
274 | if (rec->data[j] != ii) | |
275 | { | |
276 | /* Incorrect padding */ | |
277 | return -1; | |
278 | } | |
279 | } | |
280 | rec->length-=i; | |
281 | ||
282 | rec->data += bs; /* skip the implicit IV */ | |
283 | rec->input += bs; | |
284 | rec->length -= bs; | |
285 | } | |
286 | } | |
287 | return(1); | |
288 | } | |
289 |