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d02b48c6 | 1 | /* ssl/s3_pkt.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
3 | * All rights reserved. |
4 | * | |
5 | * This package is an SSL implementation written | |
6 | * by Eric Young (eay@cryptsoft.com). | |
7 | * The implementation was written so as to conform with Netscapes SSL. | |
8 | * | |
9 | * This library is free for commercial and non-commercial use as long as | |
10 | * the following conditions are aheared to. The following conditions | |
11 | * apply to all code found in this distribution, be it the RC4, RSA, | |
12 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
13 | * included with this distribution is covered by the same copyright terms | |
14 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
15 | * | |
16 | * Copyright remains Eric Young's, and as such any Copyright notices in | |
17 | * the code are not to be removed. | |
18 | * If this package is used in a product, Eric Young should be given attribution | |
19 | * as the author of the parts of the library used. | |
20 | * This can be in the form of a textual message at program startup or | |
21 | * in documentation (online or textual) provided with the package. | |
22 | * | |
23 | * Redistribution and use in source and binary forms, with or without | |
24 | * modification, are permitted provided that the following conditions | |
25 | * are met: | |
26 | * 1. Redistributions of source code must retain the copyright | |
27 | * notice, this list of conditions and the following disclaimer. | |
28 | * 2. Redistributions in binary form must reproduce the above copyright | |
29 | * notice, this list of conditions and the following disclaimer in the | |
30 | * documentation and/or other materials provided with the distribution. | |
31 | * 3. All advertising materials mentioning features or use of this software | |
32 | * must display the following acknowledgement: | |
33 | * "This product includes cryptographic software written by | |
34 | * Eric Young (eay@cryptsoft.com)" | |
35 | * The word 'cryptographic' can be left out if the rouines from the library | |
36 | * being used are not cryptographic related :-). | |
37 | * 4. If you include any Windows specific code (or a derivative thereof) from | |
38 | * the apps directory (application code) you must include an acknowledgement: | |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
40 | * | |
41 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND | |
42 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
43 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
44 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
45 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
46 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
47 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
49 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
50 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
51 | * SUCH DAMAGE. | |
52 | * | |
53 | * The licence and distribution terms for any publically available version or | |
54 | * derivative of this code cannot be changed. i.e. this code cannot simply be | |
55 | * copied and put under another distribution licence | |
56 | * [including the GNU Public Licence.] | |
57 | */ | |
c51ae173 | 58 | /* ==================================================================== |
82b0bf0b | 59 | * Copyright (c) 1998-2002 The OpenSSL Project. All rights reserved. |
c51ae173 BM |
60 | * |
61 | * Redistribution and use in source and binary forms, with or without | |
62 | * modification, are permitted provided that the following conditions | |
63 | * are met: | |
64 | * | |
65 | * 1. Redistributions of source code must retain the above copyright | |
66 | * notice, this list of conditions and the following disclaimer. | |
67 | * | |
68 | * 2. Redistributions in binary form must reproduce the above copyright | |
69 | * notice, this list of conditions and the following disclaimer in | |
70 | * the documentation and/or other materials provided with the | |
71 | * distribution. | |
72 | * | |
73 | * 3. All advertising materials mentioning features or use of this | |
74 | * software must display the following acknowledgment: | |
75 | * "This product includes software developed by the OpenSSL Project | |
76 | * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" | |
77 | * | |
78 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
79 | * endorse or promote products derived from this software without | |
80 | * prior written permission. For written permission, please contact | |
81 | * openssl-core@openssl.org. | |
82 | * | |
83 | * 5. Products derived from this software may not be called "OpenSSL" | |
84 | * nor may "OpenSSL" appear in their names without prior written | |
85 | * permission of the OpenSSL Project. | |
86 | * | |
87 | * 6. Redistributions of any form whatsoever must retain the following | |
88 | * acknowledgment: | |
89 | * "This product includes software developed by the OpenSSL Project | |
90 | * for use in the OpenSSL Toolkit (http://www.openssl.org/)" | |
91 | * | |
92 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
93 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
94 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
95 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
96 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
97 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
98 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
99 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
100 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
101 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
102 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
103 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
104 | * ==================================================================== | |
105 | * | |
106 | * This product includes cryptographic software written by Eric Young | |
107 | * (eay@cryptsoft.com). This product includes software written by Tim | |
108 | * Hudson (tjh@cryptsoft.com). | |
109 | * | |
110 | */ | |
d02b48c6 RE |
111 | |
112 | #include <stdio.h> | |
113 | #include <errno.h> | |
114 | #define USE_SOCKETS | |
7b63c0fa | 115 | #include "ssl_locl.h" |
ec577822 BM |
116 | #include <openssl/evp.h> |
117 | #include <openssl/buffer.h> | |
637f374a | 118 | #include <openssl/rand.h> |
d02b48c6 | 119 | |
61f5b6f3 | 120 | static int do_ssl3_write(SSL *s, int type, const unsigned char *buf, |
82b0bf0b | 121 | unsigned int len, int create_empty_fragment); |
d02b48c6 | 122 | static int ssl3_get_record(SSL *s); |
c51ae173 | 123 | |
36d16f8e | 124 | int ssl3_read_n(SSL *s, int n, int max, int extend) |
d02b48c6 | 125 | { |
c51ae173 BM |
126 | /* If extend == 0, obtain new n-byte packet; if extend == 1, increase |
127 | * packet by another n bytes. | |
128 | * The packet will be in the sub-array of s->s3->rbuf.buf specified | |
129 | * by s->packet and s->packet_length. | |
130 | * (If s->read_ahead is set, 'max' bytes may be stored in rbuf | |
131 | * [plus s->packet_length bytes if extend == 1].) | |
132 | */ | |
8164032a DSH |
133 | int i,len,left; |
134 | long align=0; | |
a4d64c7f AP |
135 | unsigned char *pkt; |
136 | SSL3_BUFFER *rb; | |
137 | ||
138 | if (n <= 0) return n; | |
139 | ||
140 | rb = &(s->s3->rbuf); | |
8671b898 BL |
141 | if (rb->buf == NULL) |
142 | if (!ssl3_setup_read_buffer(s)) | |
143 | return -1; | |
144 | ||
a4d64c7f AP |
145 | left = rb->left; |
146 | #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0 | |
8164032a | 147 | align = (long)rb->buf + SSL3_RT_HEADER_LENGTH; |
a4d64c7f AP |
148 | align = (-align)&(SSL3_ALIGN_PAYLOAD-1); |
149 | #endif | |
d02b48c6 | 150 | |
c51ae173 BM |
151 | if (!extend) |
152 | { | |
153 | /* start with empty packet ... */ | |
a4d64c7f AP |
154 | if (left == 0) |
155 | rb->offset = align; | |
156 | else if (align != 0 && left >= SSL3_RT_HEADER_LENGTH) | |
157 | { | |
158 | /* check if next packet length is large | |
159 | * enough to justify payload alignment... */ | |
160 | pkt = rb->buf + rb->offset; | |
161 | if (pkt[0] == SSL3_RT_APPLICATION_DATA | |
162 | && (pkt[3]<<8|pkt[4]) >= 128) | |
163 | { | |
5c168710 | 164 | /* Note that even if packet is corrupted |
a4d64c7f AP |
165 | * and its length field is insane, we can |
166 | * only be led to wrong decision about | |
167 | * whether memmove will occur or not. | |
168 | * Header values has no effect on memmove | |
169 | * arguments and therefore no buffer | |
170 | * overrun can be triggered. */ | |
171 | memmove (rb->buf+align,pkt,left); | |
172 | rb->offset = align; | |
173 | } | |
174 | } | |
175 | s->packet = rb->buf + rb->offset; | |
c51ae173 BM |
176 | s->packet_length = 0; |
177 | /* ... now we can act as if 'extend' was set */ | |
178 | } | |
179 | ||
5c168710 DSH |
180 | /* For DTLS/UDP reads should not span multiple packets |
181 | * because the read operation returns the whole packet | |
182 | * at once (as long as it fits into the buffer). */ | |
183 | if (SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER) | |
36d16f8e | 184 | { |
5c168710 | 185 | if (left > 0 && n > left) |
a4d64c7f | 186 | n = left; |
36d16f8e BL |
187 | } |
188 | ||
c51ae173 | 189 | /* if there is enough in the buffer from a previous read, take some */ |
a4d64c7f | 190 | if (left >= n) |
d02b48c6 | 191 | { |
c51ae173 | 192 | s->packet_length+=n; |
a4d64c7f AP |
193 | rb->left=left-n; |
194 | rb->offset+=n; | |
d02b48c6 RE |
195 | return(n); |
196 | } | |
197 | ||
198 | /* else we need to read more data */ | |
d02b48c6 | 199 | |
a4d64c7f AP |
200 | len = s->packet_length; |
201 | pkt = rb->buf+align; | |
202 | /* Move any available bytes to front of buffer: | |
203 | * 'len' bytes already pointed to by 'packet', | |
204 | * 'left' extra ones at the end */ | |
205 | if (s->packet != pkt) /* len > 0 */ | |
206 | { | |
207 | memmove(pkt, s->packet, len+left); | |
208 | s->packet = pkt; | |
209 | rb->offset = len + align; | |
210 | } | |
211 | ||
3f7c5920 | 212 | if (n > (int)(rb->len - rb->offset)) /* does not happen */ |
cc96f6b7 | 213 | { |
5277d7cb | 214 | SSLerr(SSL_F_SSL3_READ_N,ERR_R_INTERNAL_ERROR); |
cc96f6b7 BM |
215 | return -1; |
216 | } | |
d02b48c6 | 217 | |
a4d64c7f | 218 | if (!s->read_ahead) |
5c168710 DSH |
219 | /* ignore max parameter */ |
220 | max = n; | |
221 | else | |
222 | { | |
223 | if (max < n) | |
224 | max = n; | |
3f7c5920 | 225 | if (max > (int)(rb->len - rb->offset)) |
5c168710 DSH |
226 | max = rb->len - rb->offset; |
227 | } | |
b35e9050 | 228 | |
a4d64c7f | 229 | while (left < n) |
d02b48c6 | 230 | { |
a4d64c7f AP |
231 | /* Now we have len+left bytes at the front of s->s3->rbuf.buf |
232 | * and need to read in more until we have len+n (up to | |
233 | * len+max if possible) */ | |
c51ae173 | 234 | |
58964a49 | 235 | clear_sys_error(); |
d02b48c6 RE |
236 | if (s->rbio != NULL) |
237 | { | |
238 | s->rwstate=SSL_READING; | |
a4d64c7f | 239 | i=BIO_read(s->rbio,pkt+len+left, max-left); |
d02b48c6 RE |
240 | } |
241 | else | |
242 | { | |
243 | SSLerr(SSL_F_SSL3_READ_N,SSL_R_READ_BIO_NOT_SET); | |
c51ae173 | 244 | i = -1; |
d02b48c6 RE |
245 | } |
246 | ||
247 | if (i <= 0) | |
248 | { | |
a4d64c7f | 249 | rb->left = left; |
3d52f1d5 DSH |
250 | if (s->mode & SSL_MODE_RELEASE_BUFFERS && |
251 | SSL_version(s) != DTLS1_VERSION && SSL_version(s) != DTLS1_BAD_VER) | |
474b3b1c BM |
252 | if (len+left == 0) |
253 | ssl3_release_read_buffer(s); | |
d02b48c6 RE |
254 | return(i); |
255 | } | |
a4d64c7f | 256 | left+=i; |
5c168710 DSH |
257 | /* reads should *never* span multiple packets for DTLS because |
258 | * the underlying transport protocol is message oriented as opposed | |
259 | * to byte oriented as in the TLS case. */ | |
260 | if (SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER) | |
261 | { | |
262 | if (n > left) | |
263 | n = left; /* makes the while condition false */ | |
264 | } | |
d02b48c6 RE |
265 | } |
266 | ||
c51ae173 | 267 | /* done reading, now the book-keeping */ |
a4d64c7f AP |
268 | rb->offset += n; |
269 | rb->left = left - n; | |
c51ae173 | 270 | s->packet_length += n; |
e1798f85 | 271 | s->rwstate=SSL_NOTHING; |
d02b48c6 RE |
272 | return(n); |
273 | } | |
274 | ||
275 | /* Call this to get a new input record. | |
276 | * It will return <= 0 if more data is needed, normally due to an error | |
277 | * or non-blocking IO. | |
278 | * When it finishes, one packet has been decoded and can be found in | |
c51ae173 BM |
279 | * ssl->s3->rrec.type - is the type of record |
280 | * ssl->s3->rrec.data, - data | |
d02b48c6 RE |
281 | * ssl->s3->rrec.length, - number of bytes |
282 | */ | |
b35e9050 | 283 | /* used only by ssl3_read_bytes */ |
6b691a5c | 284 | static int ssl3_get_record(SSL *s) |
d02b48c6 RE |
285 | { |
286 | int ssl_major,ssl_minor,al; | |
ee60d9fb | 287 | int enc_err,n,i,ret= -1; |
d02b48c6 RE |
288 | SSL3_RECORD *rr; |
289 | SSL_SESSION *sess; | |
290 | unsigned char *p; | |
291 | unsigned char md[EVP_MAX_MD_SIZE]; | |
292 | short version; | |
2aec073a | 293 | unsigned mac_size, orig_len; |
3def5a01 | 294 | size_t extra; |
d02b48c6 RE |
295 | |
296 | rr= &(s->s3->rrec); | |
d02b48c6 RE |
297 | sess=s->session; |
298 | ||
58964a49 | 299 | if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER) |
d02b48c6 RE |
300 | extra=SSL3_RT_MAX_EXTRA; |
301 | else | |
302 | extra=0; | |
566dda07 | 303 | if (extra && !s->s3->init_extra) |
82b0bf0b | 304 | { |
566dda07 | 305 | /* An application error: SLS_OP_MICROSOFT_BIG_SSLV3_BUFFER |
82b0bf0b BM |
306 | * set after ssl3_setup_buffers() was done */ |
307 | SSLerr(SSL_F_SSL3_GET_RECORD, ERR_R_INTERNAL_ERROR); | |
308 | return -1; | |
309 | } | |
d02b48c6 RE |
310 | |
311 | again: | |
312 | /* check if we have the header */ | |
313 | if ( (s->rstate != SSL_ST_READ_BODY) || | |
314 | (s->packet_length < SSL3_RT_HEADER_LENGTH)) | |
315 | { | |
82b0bf0b | 316 | n=ssl3_read_n(s, SSL3_RT_HEADER_LENGTH, s->s3->rbuf.len, 0); |
d02b48c6 RE |
317 | if (n <= 0) return(n); /* error or non-blocking */ |
318 | s->rstate=SSL_ST_READ_BODY; | |
319 | ||
320 | p=s->packet; | |
36b5bb6f DSH |
321 | if (s->msg_callback) |
322 | s->msg_callback(0, 0, SSL3_RT_HEADER, p, 5, s, s->msg_callback_arg); | |
d02b48c6 RE |
323 | |
324 | /* Pull apart the header into the SSL3_RECORD */ | |
325 | rr->type= *(p++); | |
326 | ssl_major= *(p++); | |
327 | ssl_minor= *(p++); | |
328 | version=(ssl_major<<8)|ssl_minor; | |
329 | n2s(p,rr->length); | |
566dda07 DSH |
330 | #if 0 |
331 | fprintf(stderr, "Record type=%d, Length=%d\n", rr->type, rr->length); | |
332 | #endif | |
00b52578 | 333 | |
d02b48c6 | 334 | /* Lets check version */ |
1e24b3a0 | 335 | if (!s->first_packet) |
d02b48c6 | 336 | { |
58964a49 RE |
337 | if (version != s->version) |
338 | { | |
339 | SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER); | |
3e8b6485 BM |
340 | if ((s->version & 0xFF00) == (version & 0xFF00)) |
341 | /* Send back error using their minor version number :-) */ | |
342 | s->version = (unsigned short)version; | |
58964a49 RE |
343 | al=SSL_AD_PROTOCOL_VERSION; |
344 | goto f_err; | |
345 | } | |
d02b48c6 RE |
346 | } |
347 | ||
58964a49 | 348 | if ((version>>8) != SSL3_VERSION_MAJOR) |
d02b48c6 | 349 | { |
58964a49 | 350 | SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER); |
d02b48c6 RE |
351 | goto err; |
352 | } | |
353 | ||
566dda07 | 354 | if (rr->length > s->s3->rbuf.len - SSL3_RT_HEADER_LENGTH) |
d02b48c6 | 355 | { |
58964a49 | 356 | al=SSL_AD_RECORD_OVERFLOW; |
d02b48c6 RE |
357 | SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PACKET_LENGTH_TOO_LONG); |
358 | goto f_err; | |
359 | } | |
360 | ||
52732b38 | 361 | /* now s->rstate == SSL_ST_READ_BODY */ |
d02b48c6 RE |
362 | } |
363 | ||
52732b38 BM |
364 | /* s->rstate == SSL_ST_READ_BODY, get and decode the data */ |
365 | ||
3def5a01 | 366 | if (rr->length > s->packet_length-SSL3_RT_HEADER_LENGTH) |
d02b48c6 | 367 | { |
52732b38 BM |
368 | /* now s->packet_length == SSL3_RT_HEADER_LENGTH */ |
369 | i=rr->length; | |
370 | n=ssl3_read_n(s,i,i,1); | |
371 | if (n <= 0) return(n); /* error or non-blocking io */ | |
372 | /* now n == rr->length, | |
373 | * and s->packet_length == SSL3_RT_HEADER_LENGTH + rr->length */ | |
d02b48c6 RE |
374 | } |
375 | ||
52732b38 | 376 | s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */ |
d02b48c6 | 377 | |
52732b38 BM |
378 | /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length, |
379 | * and we have that many bytes in s->packet | |
380 | */ | |
d02b48c6 RE |
381 | rr->input= &(s->packet[SSL3_RT_HEADER_LENGTH]); |
382 | ||
383 | /* ok, we can now read from 's->packet' data into 'rr' | |
384 | * rr->input points at rr->length bytes, which | |
385 | * need to be copied into rr->data by either | |
386 | * the decryption or by the decompression | |
387 | * When the data is 'copied' into the rr->data buffer, | |
388 | * rr->input will be pointed at the new buffer */ | |
389 | ||
d02b48c6 RE |
390 | /* We now have - encrypted [ MAC [ compressed [ plain ] ] ] |
391 | * rr->length bytes of encrypted compressed stuff. */ | |
392 | ||
657e60fa | 393 | /* check is not needed I believe */ |
3def5a01 | 394 | if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH+extra) |
d02b48c6 | 395 | { |
58964a49 | 396 | al=SSL_AD_RECORD_OVERFLOW; |
d02b48c6 RE |
397 | SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG); |
398 | goto f_err; | |
399 | } | |
400 | ||
401 | /* decrypt in place in 'rr->input' */ | |
402 | rr->data=rr->input; | |
2aec073a | 403 | orig_len=rr->length; |
d02b48c6 | 404 | |
ee60d9fb | 405 | enc_err = s->method->ssl3_enc->enc(s,0); |
93cab6b3 BL |
406 | /* enc_err is: |
407 | * 0: (in non-constant time) if the record is publically invalid. | |
408 | * 1: if the padding is valid | |
409 | * -1: if the padding is invalid */ | |
2acc020b | 410 | if (enc_err == 0) |
d02b48c6 | 411 | { |
e33ac0e7 BL |
412 | al=SSL_AD_DECRYPTION_FAILED; |
413 | SSLerr(SSL_F_TLS1_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG); | |
414 | goto f_err; | |
d02b48c6 | 415 | } |
ee60d9fb | 416 | |
58964a49 RE |
417 | #ifdef TLS_DEBUG |
418 | printf("dec %d\n",rr->length); | |
dfeab068 | 419 | { unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); } |
58964a49 RE |
420 | printf("\n"); |
421 | #endif | |
ee60d9fb | 422 | |
d02b48c6 | 423 | /* r->length is now the compressed data plus mac */ |
e33ac0e7 BL |
424 | if ((sess != NULL) && |
425 | (s->enc_read_ctx != NULL) && | |
426 | (EVP_MD_CTX_md(s->read_hash) != NULL)) | |
d02b48c6 | 427 | { |
e33ac0e7 | 428 | /* s->read_hash != NULL => mac_size != -1 */ |
2acc020b BL |
429 | unsigned char *mac = NULL; |
430 | unsigned char mac_tmp[EVP_MAX_MD_SIZE]; | |
b948e2c5 | 431 | mac_size=EVP_MD_CTX_size(s->read_hash); |
2acc020b BL |
432 | OPENSSL_assert(mac_size <= EVP_MAX_MD_SIZE); |
433 | ||
434 | /* orig_len is the length of the record before any padding was | |
435 | * removed. This is public information, as is the MAC in use, | |
436 | * therefore we can safely process the record in a different | |
437 | * amount of time if it's too short to possibly contain a MAC. | |
438 | */ | |
2aec073a | 439 | if (orig_len < mac_size || |
2acc020b BL |
440 | /* CBC records must have a padding length byte too. */ |
441 | (EVP_CIPHER_CTX_mode(s->enc_read_ctx) == EVP_CIPH_CBC_MODE && | |
2aec073a | 442 | orig_len < mac_size+1)) |
d02b48c6 | 443 | { |
2acc020b BL |
444 | al=SSL_AD_DECODE_ERROR; |
445 | SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_LENGTH_TOO_SHORT); | |
d02b48c6 RE |
446 | goto f_err; |
447 | } | |
2acc020b BL |
448 | |
449 | if (EVP_CIPHER_CTX_mode(s->enc_read_ctx) == EVP_CIPH_CBC_MODE) | |
d02b48c6 | 450 | { |
2acc020b BL |
451 | /* We update the length so that the TLS header bytes |
452 | * can be constructed correctly but we need to extract | |
453 | * the MAC in constant time from within the record, | |
454 | * without leaking the contents of the padding bytes. | |
455 | * */ | |
456 | mac = mac_tmp; | |
2aec073a | 457 | ssl3_cbc_copy_mac(mac_tmp, rr, mac_size, orig_len); |
5b0b0e98 | 458 | rr->length -= mac_size; |
5b0b0e98 RL |
459 | } |
460 | else | |
461 | { | |
2aec073a | 462 | /* In this case there's no padding, so |orig_len| |
2acc020b BL |
463 | * equals |rec->length| and we checked that there's |
464 | * enough bytes for |mac_size| above. */ | |
465 | rr->length -= mac_size; | |
466 | mac = &rr->data[rr->length]; | |
d02b48c6 | 467 | } |
2acc020b BL |
468 | |
469 | i=s->method->ssl3_enc->mac(s,md,0 /* not send */); | |
7c770d57 | 470 | if (i < 0 || mac == NULL || CRYPTO_memcmp(md, mac, (size_t)mac_size) != 0) |
2acc020b BL |
471 | enc_err = -1; |
472 | if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra+mac_size) | |
473 | enc_err = -1; | |
d02b48c6 RE |
474 | } |
475 | ||
2acc020b | 476 | if (enc_err < 0) |
5b0b0e98 RL |
477 | { |
478 | /* A separate 'decryption_failed' alert was introduced with TLS 1.0, | |
479 | * SSL 3.0 only has 'bad_record_mac'. But unless a decryption | |
480 | * failure is directly visible from the ciphertext anyway, | |
481 | * we should not reveal which kind of error occured -- this | |
482 | * might become visible to an attacker (e.g. via a logfile) */ | |
483 | al=SSL_AD_BAD_RECORD_MAC; | |
484 | SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC); | |
485 | goto f_err; | |
486 | } | |
487 | ||
d02b48c6 | 488 | /* r->length is now just compressed */ |
dfeab068 | 489 | if (s->expand != NULL) |
d02b48c6 | 490 | { |
3def5a01 | 491 | if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra) |
d02b48c6 | 492 | { |
58964a49 | 493 | al=SSL_AD_RECORD_OVERFLOW; |
d02b48c6 RE |
494 | SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG); |
495 | goto f_err; | |
496 | } | |
36d16f8e | 497 | if (!ssl3_do_uncompress(s)) |
d02b48c6 | 498 | { |
58964a49 | 499 | al=SSL_AD_DECOMPRESSION_FAILURE; |
d02b48c6 RE |
500 | SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_DECOMPRESSION); |
501 | goto f_err; | |
502 | } | |
503 | } | |
504 | ||
3def5a01 | 505 | if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH+extra) |
d02b48c6 | 506 | { |
58964a49 | 507 | al=SSL_AD_RECORD_OVERFLOW; |
d02b48c6 RE |
508 | SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DATA_LENGTH_TOO_LONG); |
509 | goto f_err; | |
510 | } | |
511 | ||
512 | rr->off=0; | |
513 | /* So at this point the following is true | |
514 | * ssl->s3->rrec.type is the type of record | |
515 | * ssl->s3->rrec.length == number of bytes in record | |
516 | * ssl->s3->rrec.off == offset to first valid byte | |
517 | * ssl->s3->rrec.data == where to take bytes from, increment | |
518 | * after use :-). | |
519 | */ | |
520 | ||
521 | /* we have pulled in a full packet so zero things */ | |
522 | s->packet_length=0; | |
523 | ||
524 | /* just read a 0 length packet */ | |
525 | if (rr->length == 0) goto again; | |
526 | ||
566dda07 DSH |
527 | #if 0 |
528 | fprintf(stderr, "Ultimate Record type=%d, Length=%d\n", rr->type, rr->length); | |
529 | #endif | |
530 | ||
d02b48c6 | 531 | return(1); |
ee60d9fb | 532 | |
d02b48c6 RE |
533 | f_err: |
534 | ssl3_send_alert(s,SSL3_AL_FATAL,al); | |
535 | err: | |
536 | return(ret); | |
537 | } | |
538 | ||
36d16f8e | 539 | int ssl3_do_uncompress(SSL *ssl) |
d02b48c6 | 540 | { |
09b6c2ef | 541 | #ifndef OPENSSL_NO_COMP |
dfeab068 RE |
542 | int i; |
543 | SSL3_RECORD *rr; | |
544 | ||
545 | rr= &(ssl->s3->rrec); | |
546 | i=COMP_expand_block(ssl->expand,rr->comp, | |
547 | SSL3_RT_MAX_PLAIN_LENGTH,rr->data,(int)rr->length); | |
548 | if (i < 0) | |
549 | return(0); | |
550 | else | |
551 | rr->length=i; | |
552 | rr->data=rr->comp; | |
09b6c2ef | 553 | #endif |
d02b48c6 RE |
554 | return(1); |
555 | } | |
556 | ||
36d16f8e | 557 | int ssl3_do_compress(SSL *ssl) |
d02b48c6 | 558 | { |
09b6c2ef | 559 | #ifndef OPENSSL_NO_COMP |
dfeab068 RE |
560 | int i; |
561 | SSL3_RECORD *wr; | |
562 | ||
563 | wr= &(ssl->s3->wrec); | |
564 | i=COMP_compress_block(ssl->compress,wr->data, | |
565 | SSL3_RT_MAX_COMPRESSED_LENGTH, | |
566 | wr->input,(int)wr->length); | |
567 | if (i < 0) | |
568 | return(0); | |
569 | else | |
570 | wr->length=i; | |
571 | ||
572 | wr->input=wr->data; | |
09b6c2ef | 573 | #endif |
d02b48c6 RE |
574 | return(1); |
575 | } | |
576 | ||
52732b38 | 577 | /* Call this to write data in records of type 'type' |
d02b48c6 RE |
578 | * It will return <= 0 if not all data has been sent or non-blocking IO. |
579 | */ | |
52732b38 | 580 | int ssl3_write_bytes(SSL *s, int type, const void *buf_, int len) |
d02b48c6 | 581 | { |
52732b38 | 582 | const unsigned char *buf=buf_; |
d02b48c6 RE |
583 | unsigned int tot,n,nw; |
584 | int i; | |
585 | ||
586 | s->rwstate=SSL_NOTHING; | |
587 | tot=s->s3->wnum; | |
588 | s->s3->wnum=0; | |
589 | ||
590 | if (SSL_in_init(s) && !s->in_handshake) | |
591 | { | |
592 | i=s->handshake_func(s); | |
593 | if (i < 0) return(i); | |
594 | if (i == 0) | |
595 | { | |
596 | SSLerr(SSL_F_SSL3_WRITE_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE); | |
82b0bf0b | 597 | return -1; |
d02b48c6 RE |
598 | } |
599 | } | |
600 | ||
601 | n=(len-tot); | |
602 | for (;;) | |
603 | { | |
566dda07 DSH |
604 | if (n > s->max_send_fragment) |
605 | nw=s->max_send_fragment; | |
d02b48c6 RE |
606 | else |
607 | nw=n; | |
b35e9050 | 608 | |
82b0bf0b | 609 | i=do_ssl3_write(s, type, &(buf[tot]), nw, 0); |
d02b48c6 RE |
610 | if (i <= 0) |
611 | { | |
612 | s->s3->wnum=tot; | |
82b0bf0b | 613 | return i; |
d02b48c6 RE |
614 | } |
615 | ||
e1056435 BM |
616 | if ((i == (int)n) || |
617 | (type == SSL3_RT_APPLICATION_DATA && | |
11b1adad | 618 | (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE))) |
e1056435 | 619 | { |
82b0bf0b BM |
620 | /* next chunk of data should get another prepended empty fragment |
621 | * in ciphersuites with known-IV weakness: */ | |
622 | s->s3->empty_fragment_done = 0; | |
623 | ||
624 | return tot+i; | |
e1056435 | 625 | } |
d02b48c6 RE |
626 | |
627 | n-=i; | |
628 | tot+=i; | |
629 | } | |
630 | } | |
631 | ||
61f5b6f3 | 632 | static int do_ssl3_write(SSL *s, int type, const unsigned char *buf, |
82b0bf0b | 633 | unsigned int len, int create_empty_fragment) |
d02b48c6 RE |
634 | { |
635 | unsigned char *p,*plen; | |
636 | int i,mac_size,clear=0; | |
8164032a | 637 | int prefix_len=0; |
637f374a | 638 | int eivlen; |
8164032a | 639 | long align=0; |
d02b48c6 | 640 | SSL3_RECORD *wr; |
a4d64c7f | 641 | SSL3_BUFFER *wb=&(s->s3->wbuf); |
d02b48c6 RE |
642 | SSL_SESSION *sess; |
643 | ||
8671b898 BL |
644 | if (wb->buf == NULL) |
645 | if (!ssl3_setup_write_buffer(s)) | |
646 | return -1; | |
647 | ||
82b0bf0b | 648 | /* first check if there is a SSL3_BUFFER still being written |
d02b48c6 | 649 | * out. This will happen with non blocking IO */ |
a4d64c7f | 650 | if (wb->left != 0) |
d02b48c6 RE |
651 | return(ssl3_write_pending(s,type,buf,len)); |
652 | ||
653 | /* If we have an alert to send, lets send it */ | |
654 | if (s->s3->alert_dispatch) | |
655 | { | |
36d16f8e | 656 | i=s->method->ssl_dispatch_alert(s); |
d02b48c6 RE |
657 | if (i <= 0) |
658 | return(i); | |
659 | /* if it went, fall through and send more stuff */ | |
660 | } | |
661 | ||
82b0bf0b BM |
662 | if (len == 0 && !create_empty_fragment) |
663 | return 0; | |
b35e9050 | 664 | |
d02b48c6 | 665 | wr= &(s->s3->wrec); |
d02b48c6 RE |
666 | sess=s->session; |
667 | ||
668 | if ( (sess == NULL) || | |
669 | (s->enc_write_ctx == NULL) || | |
b948e2c5 | 670 | (EVP_MD_CTX_md(s->write_hash) == NULL)) |
fc90e42c AP |
671 | { |
672 | #if 1 | |
673 | clear=s->enc_write_ctx?0:1; /* must be AEAD cipher */ | |
674 | #else | |
d02b48c6 | 675 | clear=1; |
fc90e42c | 676 | #endif |
d02b48c6 | 677 | mac_size=0; |
fc90e42c | 678 | } |
d02b48c6 | 679 | else |
0eab41fb | 680 | { |
b948e2c5 | 681 | mac_size=EVP_MD_CTX_size(s->write_hash); |
0eab41fb BL |
682 | if (mac_size < 0) |
683 | goto err; | |
684 | } | |
d02b48c6 | 685 | |
82b0bf0b BM |
686 | /* 'create_empty_fragment' is true only when this function calls itself */ |
687 | if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done) | |
688 | { | |
689 | /* countermeasure against known-IV weakness in CBC ciphersuites | |
690 | * (see http://www.openssl.org/~bodo/tls-cbc.txt) */ | |
691 | ||
692 | if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA) | |
693 | { | |
694 | /* recursive function call with 'create_empty_fragment' set; | |
695 | * this prepares and buffers the data for an empty fragment | |
696 | * (these 'prefix_len' bytes are sent out later | |
697 | * together with the actual payload) */ | |
698 | prefix_len = do_ssl3_write(s, type, buf, 0, 1); | |
699 | if (prefix_len <= 0) | |
700 | goto err; | |
701 | ||
566dda07 DSH |
702 | if (prefix_len > |
703 | (SSL3_RT_HEADER_LENGTH + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD)) | |
82b0bf0b BM |
704 | { |
705 | /* insufficient space */ | |
706 | SSLerr(SSL_F_DO_SSL3_WRITE, ERR_R_INTERNAL_ERROR); | |
707 | goto err; | |
708 | } | |
709 | } | |
710 | ||
711 | s->s3->empty_fragment_done = 1; | |
712 | } | |
713 | ||
a4d64c7f AP |
714 | if (create_empty_fragment) |
715 | { | |
716 | #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0 | |
717 | /* extra fragment would be couple of cipher blocks, | |
718 | * which would be multiple of SSL3_ALIGN_PAYLOAD, so | |
719 | * if we want to align the real payload, then we can | |
720 | * just pretent we simply have two headers. */ | |
8164032a | 721 | align = (long)wb->buf + 2*SSL3_RT_HEADER_LENGTH; |
a4d64c7f AP |
722 | align = (-align)&(SSL3_ALIGN_PAYLOAD-1); |
723 | #endif | |
724 | p = wb->buf + align; | |
725 | wb->offset = align; | |
726 | } | |
727 | else if (prefix_len) | |
728 | { | |
729 | p = wb->buf + wb->offset + prefix_len; | |
730 | } | |
731 | else | |
732 | { | |
733 | #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0 | |
8164032a | 734 | align = (long)wb->buf + SSL3_RT_HEADER_LENGTH; |
a4d64c7f AP |
735 | align = (-align)&(SSL3_ALIGN_PAYLOAD-1); |
736 | #endif | |
737 | p = wb->buf + align; | |
738 | wb->offset = align; | |
739 | } | |
d02b48c6 RE |
740 | |
741 | /* write the header */ | |
82b0bf0b | 742 | |
d02b48c6 RE |
743 | *(p++)=type&0xff; |
744 | wr->type=type; | |
745 | ||
58964a49 | 746 | *(p++)=(s->version>>8); |
293706e7 DSH |
747 | /* Some servers hang if iniatial client hello is larger than 256 |
748 | * bytes and record version number > TLS 1.0 | |
749 | */ | |
750 | if (s->state == SSL3_ST_CW_CLNT_HELLO_B | |
c3b13033 | 751 | && !s->renegotiate |
293706e7 DSH |
752 | && TLS1_get_version(s) > TLS1_VERSION) |
753 | *(p++) = 0x1; | |
754 | else | |
755 | *(p++)=s->version&0xff; | |
00b52578 | 756 | |
82b0bf0b | 757 | /* field where we are to write out packet length */ |
d02b48c6 RE |
758 | plen=p; |
759 | p+=2; | |
637f374a | 760 | /* Explicit IV length, block ciphers and TLS version 1.1 or later */ |
28dd49fa | 761 | if (s->enc_write_ctx && s->version >= TLS1_1_VERSION) |
637f374a | 762 | { |
28dd49fa DSH |
763 | int mode = EVP_CIPHER_CTX_mode(s->enc_write_ctx); |
764 | if (mode == EVP_CIPH_CBC_MODE) | |
765 | { | |
766 | eivlen = EVP_CIPHER_CTX_iv_length(s->enc_write_ctx); | |
767 | if (eivlen <= 1) | |
768 | eivlen = 0; | |
769 | } | |
770 | /* Need explicit part of IV for GCM mode */ | |
771 | else if (mode == EVP_CIPH_GCM_MODE) | |
772 | eivlen = EVP_GCM_TLS_EXPLICIT_IV_LEN; | |
d18a0df0 DSH |
773 | else |
774 | eivlen = 0; | |
637f374a DSH |
775 | } |
776 | else | |
777 | eivlen = 0; | |
b35e9050 | 778 | |
d02b48c6 | 779 | /* lets setup the record stuff. */ |
637f374a | 780 | wr->data=p + eivlen; |
d02b48c6 RE |
781 | wr->length=(int)len; |
782 | wr->input=(unsigned char *)buf; | |
783 | ||
784 | /* we now 'read' from wr->input, wr->length bytes into | |
785 | * wr->data */ | |
786 | ||
787 | /* first we compress */ | |
dfeab068 | 788 | if (s->compress != NULL) |
d02b48c6 | 789 | { |
36d16f8e | 790 | if (!ssl3_do_compress(s)) |
d02b48c6 RE |
791 | { |
792 | SSLerr(SSL_F_DO_SSL3_WRITE,SSL_R_COMPRESSION_FAILURE); | |
793 | goto err; | |
794 | } | |
795 | } | |
796 | else | |
797 | { | |
798 | memcpy(wr->data,wr->input,wr->length); | |
799 | wr->input=wr->data; | |
800 | } | |
801 | ||
802 | /* we should still have the output to wr->data and the input | |
803 | * from wr->input. Length should be wr->length. | |
804 | * wr->data still points in the wb->buf */ | |
805 | ||
806 | if (mac_size != 0) | |
807 | { | |
637f374a | 808 | if (s->method->ssl3_enc->mac(s,&(p[wr->length + eivlen]),1) < 0) |
0eab41fb | 809 | goto err; |
d02b48c6 | 810 | wr->length+=mac_size; |
637f374a DSH |
811 | } |
812 | ||
813 | wr->input=p; | |
814 | wr->data=p; | |
815 | ||
816 | if (eivlen) | |
817 | { | |
338a61b9 DSH |
818 | /* if (RAND_pseudo_bytes(p, eivlen) <= 0) |
819 | goto err; */ | |
637f374a | 820 | wr->length += eivlen; |
d02b48c6 RE |
821 | } |
822 | ||
823 | /* ssl3_enc can only have an error on read */ | |
58964a49 | 824 | s->method->ssl3_enc->enc(s,1); |
d02b48c6 RE |
825 | |
826 | /* record length after mac and block padding */ | |
827 | s2n(wr->length,plen); | |
828 | ||
36b5bb6f DSH |
829 | if (s->msg_callback) |
830 | s->msg_callback(1, 0, SSL3_RT_HEADER, plen - 5, 5, s, s->msg_callback_arg); | |
831 | ||
d02b48c6 RE |
832 | /* we should now have |
833 | * wr->data pointing to the encrypted data, which is | |
834 | * wr->length long */ | |
835 | wr->type=type; /* not needed but helps for debugging */ | |
836 | wr->length+=SSL3_RT_HEADER_LENGTH; | |
837 | ||
82b0bf0b BM |
838 | if (create_empty_fragment) |
839 | { | |
840 | /* we are in a recursive call; | |
841 | * just return the length, don't write out anything here | |
842 | */ | |
843 | return wr->length; | |
844 | } | |
d02b48c6 | 845 | |
82b0bf0b BM |
846 | /* now let's set up wb */ |
847 | wb->left = prefix_len + wr->length; | |
82b0bf0b BM |
848 | |
849 | /* memorize arguments so that ssl3_write_pending can detect bad write retries later */ | |
d02b48c6 RE |
850 | s->s3->wpend_tot=len; |
851 | s->s3->wpend_buf=buf; | |
852 | s->s3->wpend_type=type; | |
853 | s->s3->wpend_ret=len; | |
854 | ||
855 | /* we now just need to write the buffer */ | |
82b0bf0b | 856 | return ssl3_write_pending(s,type,buf,len); |
d02b48c6 | 857 | err: |
82b0bf0b | 858 | return -1; |
d02b48c6 RE |
859 | } |
860 | ||
861 | /* if s->s3->wbuf.left != 0, we need to call this */ | |
36d16f8e BL |
862 | int ssl3_write_pending(SSL *s, int type, const unsigned char *buf, |
863 | unsigned int len) | |
d02b48c6 RE |
864 | { |
865 | int i; | |
a4d64c7f | 866 | SSL3_BUFFER *wb=&(s->s3->wbuf); |
d02b48c6 | 867 | |
58964a49 | 868 | /* XXXX */ |
e1056435 BM |
869 | if ((s->s3->wpend_tot > (int)len) |
870 | || ((s->s3->wpend_buf != buf) && | |
1afd8b39 | 871 | !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER)) |
d02b48c6 RE |
872 | || (s->s3->wpend_type != type)) |
873 | { | |
874 | SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY); | |
58964a49 | 875 | return(-1); |
d02b48c6 RE |
876 | } |
877 | ||
878 | for (;;) | |
879 | { | |
58964a49 | 880 | clear_sys_error(); |
d02b48c6 RE |
881 | if (s->wbio != NULL) |
882 | { | |
883 | s->rwstate=SSL_WRITING; | |
884 | i=BIO_write(s->wbio, | |
a4d64c7f AP |
885 | (char *)&(wb->buf[wb->offset]), |
886 | (unsigned int)wb->left); | |
d02b48c6 RE |
887 | } |
888 | else | |
889 | { | |
890 | SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BIO_NOT_SET); | |
891 | i= -1; | |
892 | } | |
a4d64c7f | 893 | if (i == wb->left) |
d02b48c6 | 894 | { |
a4d64c7f AP |
895 | wb->left=0; |
896 | wb->offset+=i; | |
3d52f1d5 DSH |
897 | if (s->mode & SSL_MODE_RELEASE_BUFFERS && |
898 | SSL_version(s) != DTLS1_VERSION && SSL_version(s) != DTLS1_BAD_VER) | |
8671b898 | 899 | ssl3_release_write_buffer(s); |
d02b48c6 RE |
900 | s->rwstate=SSL_NOTHING; |
901 | return(s->s3->wpend_ret); | |
902 | } | |
7e7af0bc | 903 | else if (i <= 0) { |
8711efb4 DSH |
904 | if (s->version == DTLS1_VERSION || |
905 | s->version == DTLS1_BAD_VER) { | |
906 | /* For DTLS, just drop it. That's kind of the whole | |
7e7af0bc LJ |
907 | point in using a datagram service */ |
908 | wb->left = 0; | |
909 | } | |
d02b48c6 | 910 | return(i); |
7e7af0bc | 911 | } |
a4d64c7f AP |
912 | wb->offset+=i; |
913 | wb->left-=i; | |
d02b48c6 RE |
914 | } |
915 | } | |
916 | ||
b35e9050 BM |
917 | /* Return up to 'len' payload bytes received in 'type' records. |
918 | * 'type' is one of the following: | |
919 | * | |
920 | * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us) | |
921 | * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us) | |
922 | * - 0 (during a shutdown, no data has to be returned) | |
923 | * | |
924 | * If we don't have stored data to work from, read a SSL/TLS record first | |
925 | * (possibly multiple records if we still don't have anything to return). | |
926 | * | |
927 | * This function must handle any surprises the peer may have for us, such as | |
928 | * Alert records (e.g. close_notify), ChangeCipherSpec records (not really | |
929 | * a surprise, but handled as if it were), or renegotiation requests. | |
930 | * Also if record payloads contain fragments too small to process, we store | |
931 | * them until there is enough for the respective protocol (the record protocol | |
932 | * may use arbitrary fragmentation and even interleaving): | |
933 | * Change cipher spec protocol | |
934 | * just 1 byte needed, no need for keeping anything stored | |
935 | * Alert protocol | |
936 | * 2 bytes needed (AlertLevel, AlertDescription) | |
937 | * Handshake protocol | |
938 | * 4 bytes needed (HandshakeType, uint24 length) -- we just have | |
939 | * to detect unexpected Client Hello and Hello Request messages | |
940 | * here, anything else is handled by higher layers | |
941 | * Application data protocol | |
942 | * none of our business | |
943 | */ | |
5a4fbc69 | 944 | int ssl3_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek) |
d02b48c6 | 945 | { |
b08b07b8 BM |
946 | int al,i,j,ret; |
947 | unsigned int n; | |
d02b48c6 | 948 | SSL3_RECORD *rr; |
45d87a1f | 949 | void (*cb)(const SSL *ssl,int type2,int val)=NULL; |
d02b48c6 | 950 | |
c51ae173 | 951 | if (s->s3->rbuf.buf == NULL) /* Not initialized yet */ |
8671b898 | 952 | if (!ssl3_setup_read_buffer(s)) |
d02b48c6 RE |
953 | return(-1); |
954 | ||
a0aae68c BM |
955 | if ((type && (type != SSL3_RT_APPLICATION_DATA) && (type != SSL3_RT_HANDSHAKE) && type) || |
956 | (peek && (type != SSL3_RT_APPLICATION_DATA))) | |
b35e9050 | 957 | { |
5277d7cb | 958 | SSLerr(SSL_F_SSL3_READ_BYTES, ERR_R_INTERNAL_ERROR); |
b35e9050 BM |
959 | return -1; |
960 | } | |
961 | ||
962 | if ((type == SSL3_RT_HANDSHAKE) && (s->s3->handshake_fragment_len > 0)) | |
963 | /* (partially) satisfy request from storage */ | |
964 | { | |
965 | unsigned char *src = s->s3->handshake_fragment; | |
966 | unsigned char *dst = buf; | |
8ab59e7a | 967 | unsigned int k; |
b35e9050 | 968 | |
a0aae68c | 969 | /* peek == 0 */ |
b35e9050 BM |
970 | n = 0; |
971 | while ((len > 0) && (s->s3->handshake_fragment_len > 0)) | |
972 | { | |
973 | *dst++ = *src++; | |
974 | len--; s->s3->handshake_fragment_len--; | |
975 | n++; | |
976 | } | |
977 | /* move any remaining fragment bytes: */ | |
8ab59e7a DSH |
978 | for (k = 0; k < s->s3->handshake_fragment_len; k++) |
979 | s->s3->handshake_fragment[k] = *src++; | |
b35e9050 BM |
980 | return n; |
981 | } | |
982 | ||
983 | /* Now s->s3->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */ | |
984 | ||
58964a49 | 985 | if (!s->in_handshake && SSL_in_init(s)) |
d02b48c6 | 986 | { |
b35e9050 | 987 | /* type == SSL3_RT_APPLICATION_DATA */ |
d02b48c6 RE |
988 | i=s->handshake_func(s); |
989 | if (i < 0) return(i); | |
990 | if (i == 0) | |
991 | { | |
992 | SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE); | |
993 | return(-1); | |
994 | } | |
995 | } | |
996 | start: | |
997 | s->rwstate=SSL_NOTHING; | |
998 | ||
c51ae173 BM |
999 | /* s->s3->rrec.type - is the type of record |
1000 | * s->s3->rrec.data, - data | |
1001 | * s->s3->rrec.off, - offset into 'data' for next read | |
1002 | * s->s3->rrec.length, - number of bytes. */ | |
b35e9050 | 1003 | rr = &(s->s3->rrec); |
d02b48c6 | 1004 | |
a0aae68c | 1005 | /* get new packet if necessary */ |
d02b48c6 RE |
1006 | if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY)) |
1007 | { | |
1008 | ret=ssl3_get_record(s); | |
1009 | if (ret <= 0) return(ret); | |
1010 | } | |
1011 | ||
1012 | /* we now have a packet which can be read and processed */ | |
1013 | ||
b35e9050 BM |
1014 | if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec, |
1015 | * reset by ssl3_get_finished */ | |
1016 | && (rr->type != SSL3_RT_HANDSHAKE)) | |
d02b48c6 | 1017 | { |
58964a49 | 1018 | al=SSL_AD_UNEXPECTED_MESSAGE; |
d02b48c6 | 1019 | SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_DATA_BETWEEN_CCS_AND_FINISHED); |
4843acc8 | 1020 | goto f_err; |
d02b48c6 RE |
1021 | } |
1022 | ||
a0aae68c BM |
1023 | /* If the other end has shut down, throw anything we read away |
1024 | * (even in 'peek' mode) */ | |
d02b48c6 RE |
1025 | if (s->shutdown & SSL_RECEIVED_SHUTDOWN) |
1026 | { | |
1027 | rr->length=0; | |
1028 | s->rwstate=SSL_NOTHING; | |
1029 | return(0); | |
1030 | } | |
1031 | ||
b35e9050 BM |
1032 | |
1033 | if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */ | |
1034 | { | |
1035 | /* make sure that we are not getting application data when we | |
1036 | * are doing a handshake for the first time */ | |
1037 | if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) && | |
1038 | (s->enc_read_ctx == NULL)) | |
1039 | { | |
1040 | al=SSL_AD_UNEXPECTED_MESSAGE; | |
1041 | SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE); | |
1042 | goto f_err; | |
1043 | } | |
1044 | ||
1045 | if (len <= 0) return(len); | |
1046 | ||
1047 | if ((unsigned int)len > rr->length) | |
e5599db4 | 1048 | n = rr->length; |
b35e9050 | 1049 | else |
e5599db4 | 1050 | n = (unsigned int)len; |
b35e9050 | 1051 | |
e5599db4 | 1052 | memcpy(buf,&(rr->data[rr->off]),n); |
a0aae68c | 1053 | if (!peek) |
b35e9050 | 1054 | { |
a0aae68c BM |
1055 | rr->length-=n; |
1056 | rr->off+=n; | |
1057 | if (rr->length == 0) | |
1058 | { | |
1059 | s->rstate=SSL_ST_READ_HEADER; | |
1060 | rr->off=0; | |
474b3b1c | 1061 | if (s->mode & SSL_MODE_RELEASE_BUFFERS) |
8671b898 | 1062 | ssl3_release_read_buffer(s); |
a0aae68c | 1063 | } |
b35e9050 | 1064 | } |
b35e9050 BM |
1065 | return(n); |
1066 | } | |
1067 | ||
1068 | ||
1069 | /* If we get here, then type != rr->type; if we have a handshake | |
1070 | * message, then it was unexpected (Hello Request or Client Hello). */ | |
1071 | ||
1072 | /* In case of record types for which we have 'fragment' storage, | |
1073 | * fill that so that we can process the data at a fixed place. | |
1074 | */ | |
1075 | { | |
e5599db4 | 1076 | unsigned int dest_maxlen = 0; |
72b60351 | 1077 | unsigned char *dest = NULL; |
e5599db4 | 1078 | unsigned int *dest_len = NULL; |
b35e9050 BM |
1079 | |
1080 | if (rr->type == SSL3_RT_HANDSHAKE) | |
1081 | { | |
1082 | dest_maxlen = sizeof s->s3->handshake_fragment; | |
1083 | dest = s->s3->handshake_fragment; | |
1084 | dest_len = &s->s3->handshake_fragment_len; | |
1085 | } | |
1086 | else if (rr->type == SSL3_RT_ALERT) | |
1087 | { | |
1088 | dest_maxlen = sizeof s->s3->alert_fragment; | |
1089 | dest = s->s3->alert_fragment; | |
1090 | dest_len = &s->s3->alert_fragment_len; | |
1091 | } | |
4817504d DSH |
1092 | #ifndef OPENSSL_NO_HEARTBEATS |
1093 | else if (rr->type == TLS1_RT_HEARTBEAT) | |
1094 | { | |
1095 | tls1_process_heartbeat(s); | |
1096 | ||
1097 | /* Exit and notify application to read again */ | |
1098 | rr->length = 0; | |
1099 | s->rwstate=SSL_READING; | |
1100 | BIO_clear_retry_flags(SSL_get_rbio(s)); | |
1101 | BIO_set_retry_read(SSL_get_rbio(s)); | |
1102 | return(-1); | |
1103 | } | |
1104 | #endif | |
b35e9050 BM |
1105 | |
1106 | if (dest_maxlen > 0) | |
1107 | { | |
1108 | n = dest_maxlen - *dest_len; /* available space in 'dest' */ | |
e5599db4 | 1109 | if (rr->length < n) |
b35e9050 BM |
1110 | n = rr->length; /* available bytes */ |
1111 | ||
1112 | /* now move 'n' bytes: */ | |
1113 | while (n-- > 0) | |
1114 | { | |
1115 | dest[(*dest_len)++] = rr->data[rr->off++]; | |
1116 | rr->length--; | |
1117 | } | |
1118 | ||
1119 | if (*dest_len < dest_maxlen) | |
1120 | goto start; /* fragment was too small */ | |
1121 | } | |
1122 | } | |
1123 | ||
1124 | /* s->s3->handshake_fragment_len == 4 iff rr->type == SSL3_RT_HANDSHAKE; | |
1125 | * s->s3->alert_fragment_len == 2 iff rr->type == SSL3_RT_ALERT. | |
1126 | * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */ | |
1127 | ||
1128 | /* If we are a client, check for an incoming 'Hello Request': */ | |
1129 | if ((!s->server) && | |
1130 | (s->s3->handshake_fragment_len >= 4) && | |
1131 | (s->s3->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) && | |
d02b48c6 RE |
1132 | (s->session != NULL) && (s->session->cipher != NULL)) |
1133 | { | |
b35e9050 BM |
1134 | s->s3->handshake_fragment_len = 0; |
1135 | ||
1136 | if ((s->s3->handshake_fragment[1] != 0) || | |
1137 | (s->s3->handshake_fragment[2] != 0) || | |
1138 | (s->s3->handshake_fragment[3] != 0)) | |
d02b48c6 | 1139 | { |
58964a49 | 1140 | al=SSL_AD_DECODE_ERROR; |
c51ae173 | 1141 | SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_HELLO_REQUEST); |
4843acc8 | 1142 | goto f_err; |
d02b48c6 RE |
1143 | } |
1144 | ||
a661b653 BM |
1145 | if (s->msg_callback) |
1146 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->s3->handshake_fragment, 4, s, s->msg_callback_arg); | |
1147 | ||
d02b48c6 | 1148 | if (SSL_is_init_finished(s) && |
58964a49 RE |
1149 | !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) && |
1150 | !s->s3->renegotiate) | |
d02b48c6 RE |
1151 | { |
1152 | ssl3_renegotiate(s); | |
58964a49 | 1153 | if (ssl3_renegotiate_check(s)) |
d02b48c6 | 1154 | { |
b08b07b8 BM |
1155 | i=s->handshake_func(s); |
1156 | if (i < 0) return(i); | |
1157 | if (i == 0) | |
58964a49 RE |
1158 | { |
1159 | SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE); | |
1160 | return(-1); | |
1161 | } | |
1b8a8088 | 1162 | |
54f10e6a | 1163 | if (!(s->mode & SSL_MODE_AUTO_RETRY)) |
1b8a8088 | 1164 | { |
54f10e6a BM |
1165 | if (s->s3->rbuf.left == 0) /* no read-ahead left? */ |
1166 | { | |
1167 | BIO *bio; | |
1168 | /* In the case where we try to read application data, | |
1169 | * but we trigger an SSL handshake, we return -1 with | |
1170 | * the retry option set. Otherwise renegotiation may | |
1171 | * cause nasty problems in the blocking world */ | |
1172 | s->rwstate=SSL_READING; | |
1173 | bio=SSL_get_rbio(s); | |
1174 | BIO_clear_retry_flags(bio); | |
1175 | BIO_set_retry_read(bio); | |
1176 | return(-1); | |
1177 | } | |
1b8a8088 | 1178 | } |
d02b48c6 RE |
1179 | } |
1180 | } | |
b35e9050 BM |
1181 | /* we either finished a handshake or ignored the request, |
1182 | * now try again to obtain the (application) data we were asked for */ | |
1183 | goto start; | |
d02b48c6 | 1184 | } |
82e610e2 DSH |
1185 | /* If we are a server and get a client hello when renegotiation isn't |
1186 | * allowed send back a no renegotiation alert and carry on. | |
1187 | * WARNING: experimental code, needs reviewing (steve) | |
1188 | */ | |
1189 | if (s->server && | |
1190 | SSL_is_init_finished(s) && | |
1191 | !s->s3->send_connection_binding && | |
1192 | (s->version > SSL3_VERSION) && | |
1193 | (s->s3->handshake_fragment_len >= 4) && | |
1194 | (s->s3->handshake_fragment[0] == SSL3_MT_CLIENT_HELLO) && | |
1195 | (s->session != NULL) && (s->session->cipher != NULL) && | |
1196 | !(s->ctx->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) | |
1197 | ||
1198 | { | |
1199 | /*s->s3->handshake_fragment_len = 0;*/ | |
1200 | rr->length = 0; | |
1201 | ssl3_send_alert(s,SSL3_AL_WARNING, SSL_AD_NO_RENEGOTIATION); | |
1202 | goto start; | |
1203 | } | |
b35e9050 | 1204 | if (s->s3->alert_fragment_len >= 2) |
d02b48c6 | 1205 | { |
e5599db4 BM |
1206 | int alert_level = s->s3->alert_fragment[0]; |
1207 | int alert_descr = s->s3->alert_fragment[1]; | |
d02b48c6 | 1208 | |
b35e9050 | 1209 | s->s3->alert_fragment_len = 0; |
d02b48c6 | 1210 | |
a661b653 BM |
1211 | if (s->msg_callback) |
1212 | s->msg_callback(0, s->version, SSL3_RT_ALERT, s->s3->alert_fragment, 2, s, s->msg_callback_arg); | |
1213 | ||
b35e9050 BM |
1214 | if (s->info_callback != NULL) |
1215 | cb=s->info_callback; | |
1216 | else if (s->ctx->info_callback != NULL) | |
1217 | cb=s->ctx->info_callback; | |
d02b48c6 | 1218 | |
b35e9050 BM |
1219 | if (cb != NULL) |
1220 | { | |
e5599db4 BM |
1221 | j = (alert_level << 8) | alert_descr; |
1222 | cb(s, SSL_CB_READ_ALERT, j); | |
b35e9050 | 1223 | } |
d02b48c6 | 1224 | |
e5599db4 | 1225 | if (alert_level == 1) /* warning */ |
b35e9050 | 1226 | { |
e5599db4 BM |
1227 | s->s3->warn_alert = alert_descr; |
1228 | if (alert_descr == SSL_AD_CLOSE_NOTIFY) | |
d02b48c6 | 1229 | { |
e5599db4 | 1230 | s->shutdown |= SSL_RECEIVED_SHUTDOWN; |
d02b48c6 RE |
1231 | return(0); |
1232 | } | |
82e610e2 DSH |
1233 | /* This is a warning but we receive it if we requested |
1234 | * renegotiation and the peer denied it. Terminate with | |
1235 | * a fatal alert because if application tried to | |
1236 | * renegotiatie it presumably had a good reason and | |
1237 | * expects it to succeed. | |
1238 | * | |
1239 | * In future we might have a renegotiation where we | |
1240 | * don't care if the peer refused it where we carry on. | |
1241 | */ | |
1242 | else if (alert_descr == SSL_AD_NO_RENEGOTIATION) | |
1243 | { | |
1244 | al = SSL_AD_HANDSHAKE_FAILURE; | |
1245 | SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_NO_RENEGOTIATION); | |
1246 | goto f_err; | |
1247 | } | |
edc032b5 BL |
1248 | #ifdef SSL_AD_MISSING_SRP_USERNAME |
1249 | else if (alert_descr == SSL_AD_MISSING_SRP_USERNAME) | |
1250 | return(0); | |
1251 | #endif | |
d02b48c6 | 1252 | } |
e5599db4 | 1253 | else if (alert_level == 2) /* fatal */ |
d02b48c6 | 1254 | { |
b35e9050 BM |
1255 | char tmp[16]; |
1256 | ||
d02b48c6 | 1257 | s->rwstate=SSL_NOTHING; |
e5599db4 BM |
1258 | s->s3->fatal_alert = alert_descr; |
1259 | SSLerr(SSL_F_SSL3_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr); | |
c129544f | 1260 | BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr); |
b35e9050 BM |
1261 | ERR_add_error_data(2,"SSL alert number ",tmp); |
1262 | s->shutdown|=SSL_RECEIVED_SHUTDOWN; | |
1263 | SSL_CTX_remove_session(s->ctx,s->session); | |
d02b48c6 RE |
1264 | return(0); |
1265 | } | |
b35e9050 | 1266 | else |
d02b48c6 | 1267 | { |
b35e9050 BM |
1268 | al=SSL_AD_ILLEGAL_PARAMETER; |
1269 | SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE); | |
1270 | goto f_err; | |
d02b48c6 RE |
1271 | } |
1272 | ||
b35e9050 BM |
1273 | goto start; |
1274 | } | |
1275 | ||
1276 | if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */ | |
1277 | { | |
1278 | s->rwstate=SSL_NOTHING; | |
1279 | rr->length=0; | |
1280 | return(0); | |
1281 | } | |
1282 | ||
1283 | if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC) | |
1284 | { | |
1285 | /* 'Change Cipher Spec' is just a single byte, so we know | |
1286 | * exactly what the record payload has to look like */ | |
1287 | if ( (rr->length != 1) || (rr->off != 0) || | |
1288 | (rr->data[0] != SSL3_MT_CCS)) | |
d02b48c6 | 1289 | { |
4843acc8 | 1290 | al=SSL_AD_ILLEGAL_PARAMETER; |
b35e9050 | 1291 | SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC); |
4843acc8 | 1292 | goto f_err; |
b35e9050 | 1293 | } |
58964a49 | 1294 | |
9e5790ce NL |
1295 | /* Check we have a cipher to change to */ |
1296 | if (s->s3->tmp.new_cipher == NULL) | |
1297 | { | |
1298 | al=SSL_AD_UNEXPECTED_MESSAGE; | |
fbeaa3c4 | 1299 | SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_CCS_RECEIVED_EARLY); |
9e5790ce NL |
1300 | goto f_err; |
1301 | } | |
1302 | ||
b35e9050 | 1303 | rr->length=0; |
a661b653 BM |
1304 | |
1305 | if (s->msg_callback) | |
1306 | s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC, rr->data, 1, s, s->msg_callback_arg); | |
1307 | ||
b35e9050 | 1308 | s->s3->change_cipher_spec=1; |
36d16f8e | 1309 | if (!ssl3_do_change_cipher_spec(s)) |
b35e9050 BM |
1310 | goto err; |
1311 | else | |
1312 | goto start; | |
1313 | } | |
58964a49 | 1314 | |
b35e9050 BM |
1315 | /* Unexpected handshake message (Client Hello, or protocol violation) */ |
1316 | if ((s->s3->handshake_fragment_len >= 4) && !s->in_handshake) | |
1317 | { | |
1318 | if (((s->state&SSL_ST_MASK) == SSL_ST_OK) && | |
1319 | !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS)) | |
1320 | { | |
a2a01589 BM |
1321 | #if 0 /* worked only because C operator preferences are not as expected (and |
1322 | * because this is not really needed for clients except for detecting | |
1323 | * protocol violations): */ | |
b35e9050 BM |
1324 | s->state=SSL_ST_BEFORE|(s->server) |
1325 | ?SSL_ST_ACCEPT | |
1326 | :SSL_ST_CONNECT; | |
a2a01589 BM |
1327 | #else |
1328 | s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT; | |
1329 | #endif | |
44959ee4 | 1330 | s->renegotiate=1; |
b35e9050 BM |
1331 | s->new_session=1; |
1332 | } | |
e5599db4 BM |
1333 | i=s->handshake_func(s); |
1334 | if (i < 0) return(i); | |
1335 | if (i == 0) | |
b35e9050 BM |
1336 | { |
1337 | SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE); | |
58964a49 | 1338 | return(-1); |
d02b48c6 RE |
1339 | } |
1340 | ||
54f10e6a | 1341 | if (!(s->mode & SSL_MODE_AUTO_RETRY)) |
1b8a8088 | 1342 | { |
54f10e6a BM |
1343 | if (s->s3->rbuf.left == 0) /* no read-ahead left? */ |
1344 | { | |
1345 | BIO *bio; | |
1346 | /* In the case where we try to read application data, | |
1347 | * but we trigger an SSL handshake, we return -1 with | |
1348 | * the retry option set. Otherwise renegotiation may | |
1349 | * cause nasty problems in the blocking world */ | |
1350 | s->rwstate=SSL_READING; | |
1351 | bio=SSL_get_rbio(s); | |
1352 | BIO_clear_retry_flags(bio); | |
1353 | BIO_set_retry_read(bio); | |
1354 | return(-1); | |
1355 | } | |
1b8a8088 | 1356 | } |
a2a01589 | 1357 | goto start; |
a2a01589 | 1358 | } |
b35e9050 BM |
1359 | |
1360 | switch (rr->type) | |
1361 | { | |
1362 | default: | |
bc36ee62 | 1363 | #ifndef OPENSSL_NO_TLS |
7409d7ad DSH |
1364 | /* TLS up to v1.1 just ignores unknown message types: |
1365 | * TLS v1.2 give an unexpected message alert. | |
1366 | */ | |
637f374a | 1367 | if (s->version >= TLS1_VERSION && s->version <= TLS1_1_VERSION) |
b35e9050 | 1368 | { |
dcbbf83d | 1369 | rr->length = 0; |
b35e9050 BM |
1370 | goto start; |
1371 | } | |
58964a49 | 1372 | #endif |
b35e9050 BM |
1373 | al=SSL_AD_UNEXPECTED_MESSAGE; |
1374 | SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD); | |
1375 | goto f_err; | |
1376 | case SSL3_RT_CHANGE_CIPHER_SPEC: | |
1377 | case SSL3_RT_ALERT: | |
1378 | case SSL3_RT_HANDSHAKE: | |
1379 | /* we already handled all of these, with the possible exception | |
1380 | * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that | |
1381 | * should not happen when type != rr->type */ | |
1382 | al=SSL_AD_UNEXPECTED_MESSAGE; | |
5277d7cb | 1383 | SSLerr(SSL_F_SSL3_READ_BYTES,ERR_R_INTERNAL_ERROR); |
b35e9050 BM |
1384 | goto f_err; |
1385 | case SSL3_RT_APPLICATION_DATA: | |
1386 | /* At this point, we were expecting handshake data, | |
1387 | * but have application data. If the library was | |
1388 | * running inside ssl3_read() (i.e. in_read_app_data | |
1389 | * is set) and it makes sense to read application data | |
a2a01589 | 1390 | * at this point (session renegotiation not yet started), |
b35e9050 BM |
1391 | * we will indulge it. |
1392 | */ | |
1393 | if (s->s3->in_read_app_data && | |
1394 | (s->s3->total_renegotiations != 0) && | |
1395 | (( | |
1396 | (s->state & SSL_ST_CONNECT) && | |
1397 | (s->state >= SSL3_ST_CW_CLNT_HELLO_A) && | |
1398 | (s->state <= SSL3_ST_CR_SRVR_HELLO_A) | |
1399 | ) || ( | |
1400 | (s->state & SSL_ST_ACCEPT) && | |
1401 | (s->state <= SSL3_ST_SW_HELLO_REQ_A) && | |
1402 | (s->state >= SSL3_ST_SR_CLNT_HELLO_A) | |
1403 | ) | |
1404 | )) | |
1405 | { | |
82b0bf0b | 1406 | s->s3->in_read_app_data=2; |
b35e9050 BM |
1407 | return(-1); |
1408 | } | |
1409 | else | |
1410 | { | |
58964a49 RE |
1411 | al=SSL_AD_UNEXPECTED_MESSAGE; |
1412 | SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD); | |
1413 | goto f_err; | |
58964a49 | 1414 | } |
d02b48c6 | 1415 | } |
b35e9050 | 1416 | /* not reached */ |
d02b48c6 | 1417 | |
d02b48c6 RE |
1418 | f_err: |
1419 | ssl3_send_alert(s,SSL3_AL_FATAL,al); | |
1420 | err: | |
1421 | return(-1); | |
1422 | } | |
1423 | ||
36d16f8e | 1424 | int ssl3_do_change_cipher_spec(SSL *s) |
58964a49 RE |
1425 | { |
1426 | int i; | |
c44f7540 | 1427 | const char *sender; |
58964a49 RE |
1428 | int slen; |
1429 | ||
1430 | if (s->state & SSL_ST_ACCEPT) | |
1431 | i=SSL3_CHANGE_CIPHER_SERVER_READ; | |
1432 | else | |
1433 | i=SSL3_CHANGE_CIPHER_CLIENT_READ; | |
1434 | ||
1435 | if (s->s3->tmp.key_block == NULL) | |
1436 | { | |
1cbf663a BM |
1437 | if (s->session == NULL) |
1438 | { | |
1439 | /* might happen if dtls1_read_bytes() calls this */ | |
1440 | SSLerr(SSL_F_SSL3_DO_CHANGE_CIPHER_SPEC,SSL_R_CCS_RECEIVED_EARLY); | |
1441 | return (0); | |
1442 | } | |
1443 | ||
58964a49 RE |
1444 | s->session->cipher=s->s3->tmp.new_cipher; |
1445 | if (!s->method->ssl3_enc->setup_key_block(s)) return(0); | |
1446 | } | |
1447 | ||
1448 | if (!s->method->ssl3_enc->change_cipher_state(s,i)) | |
1449 | return(0); | |
1450 | ||
1451 | /* we have to record the message digest at | |
1452 | * this point so we can get it before we read | |
1453 | * the finished message */ | |
1454 | if (s->state & SSL_ST_CONNECT) | |
1455 | { | |
c44f7540 BM |
1456 | sender=s->method->ssl3_enc->server_finished_label; |
1457 | slen=s->method->ssl3_enc->server_finished_label_len; | |
58964a49 RE |
1458 | } |
1459 | else | |
1460 | { | |
c44f7540 BM |
1461 | sender=s->method->ssl3_enc->client_finished_label; |
1462 | slen=s->method->ssl3_enc->client_finished_label_len; | |
58964a49 RE |
1463 | } |
1464 | ||
9fb617e2 | 1465 | s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s, |
9fb617e2 | 1466 | sender,slen,s->s3->tmp.peer_finish_md); |
58964a49 RE |
1467 | |
1468 | return(1); | |
1469 | } | |
1470 | ||
cc7399e7 | 1471 | int ssl3_send_alert(SSL *s, int level, int desc) |
d02b48c6 | 1472 | { |
58964a49 RE |
1473 | /* Map tls/ssl alert value to correct one */ |
1474 | desc=s->method->ssl3_enc->alert_value(desc); | |
a661b653 BM |
1475 | if (s->version == SSL3_VERSION && desc == SSL_AD_PROTOCOL_VERSION) |
1476 | desc = SSL_AD_HANDSHAKE_FAILURE; /* SSL 3.0 does not have protocol_version alerts */ | |
cc7399e7 | 1477 | if (desc < 0) return -1; |
d02b48c6 RE |
1478 | /* If a fatal one, remove from cache */ |
1479 | if ((level == 2) && (s->session != NULL)) | |
1480 | SSL_CTX_remove_session(s->ctx,s->session); | |
1481 | ||
1482 | s->s3->alert_dispatch=1; | |
1483 | s->s3->send_alert[0]=level; | |
1484 | s->s3->send_alert[1]=desc; | |
ee60d9fb | 1485 | if (s->s3->wbuf.left == 0) /* data still being written out? */ |
cc7399e7 | 1486 | return s->method->ssl_dispatch_alert(s); |
d02b48c6 RE |
1487 | /* else data is still being written out, we will get written |
1488 | * some time in the future */ | |
cc7399e7 | 1489 | return -1; |
d02b48c6 RE |
1490 | } |
1491 | ||
6b691a5c | 1492 | int ssl3_dispatch_alert(SSL *s) |
d02b48c6 RE |
1493 | { |
1494 | int i,j; | |
45d87a1f | 1495 | void (*cb)(const SSL *ssl,int type,int val)=NULL; |
d02b48c6 RE |
1496 | |
1497 | s->s3->alert_dispatch=0; | |
82b0bf0b | 1498 | i = do_ssl3_write(s, SSL3_RT_ALERT, &s->s3->send_alert[0], 2, 0); |
d02b48c6 RE |
1499 | if (i <= 0) |
1500 | { | |
1501 | s->s3->alert_dispatch=1; | |
1502 | } | |
1503 | else | |
1504 | { | |
ee60d9fb BM |
1505 | /* Alert sent to BIO. If it is important, flush it now. |
1506 | * If the message does not get sent due to non-blocking IO, | |
1507 | * we will not worry too much. */ | |
d02b48c6 | 1508 | if (s->s3->send_alert[0] == SSL3_AL_FATAL) |
d58d092b | 1509 | (void)BIO_flush(s->wbio); |
d02b48c6 | 1510 | |
a661b653 BM |
1511 | if (s->msg_callback) |
1512 | s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert, 2, s, s->msg_callback_arg); | |
1513 | ||
d02b48c6 RE |
1514 | if (s->info_callback != NULL) |
1515 | cb=s->info_callback; | |
1516 | else if (s->ctx->info_callback != NULL) | |
1517 | cb=s->ctx->info_callback; | |
b35e9050 | 1518 | |
d02b48c6 RE |
1519 | if (cb != NULL) |
1520 | { | |
1521 | j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1]; | |
1522 | cb(s,SSL_CB_WRITE_ALERT,j); | |
1523 | } | |
1524 | } | |
1525 | return(i); | |
1526 | } |