Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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" |
| 118 | #ifndef OPENSSL_NO_COMP |
| 119 | #include <openssl/comp.h> |
| 120 | #endif |
| 121 | #include <openssl/evp.h> |
| 122 | #include <openssl/hmac.h> |
| 123 | #include <openssl/md5.h> |
| 124 | #include <openssl/rand.h> |
| 125 | #ifdef KSSL_DEBUG |
| 126 | #include <openssl/des.h> |
| 127 | #endif |
| 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 | { |
| 139 | if (EVP_MD_CTX_md(s->write_hash)) |
| 140 | { |
| 141 | n=EVP_MD_CTX_size(s->write_hash); |
| 142 | if (n < 0) |
| 143 | return -1; |
| 144 | } |
| 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) |
| 157 | { |
| 158 | if (RAND_bytes(rec->input, EVP_CIPHER_block_size(ds->cipher)) <= 0) |
| 159 | return -1; |
| 160 | } |
| 161 | } |
| 162 | } |
| 163 | else |
| 164 | { |
| 165 | if (EVP_MD_CTX_md(s->read_hash)) |
| 166 | { |
| 167 | n=EVP_MD_CTX_size(s->read_hash); |
| 168 | if (n < 0) |
| 169 | return -1; |
| 170 | } |
| 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", |
| 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); |
| 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) |
| 234 | return -1; |
| 235 | } |
| 236 | |
| 237 | EVP_Cipher(ds,rec->data,rec->input,l); |
| 238 | |
| 239 | #ifdef KSSL_DEBUG |
| 240 | { |
| 241 | unsigned long i; |
| 242 | printf("\trec->data="); |
| 243 | for (i=0; i<l; i++) |
| 244 | printf(" %02x", rec->data[i]); printf("\n"); |
| 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'. */ |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 263 | if (i > (int)rec->length) |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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 | |