s2_lib.c revision 280304 
1/* ssl/s2_lib.c */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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 */
58/* ====================================================================
59 * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
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 */
111
112#include "ssl_locl.h"
113#ifndef OPENSSL_NO_SSL2
114# include <stdio.h>
115# include <openssl/objects.h>
116# include <openssl/evp.h>
117# include <openssl/md5.h>
118
119const char ssl2_version_str[] = "SSLv2" OPENSSL_VERSION_PTEXT;
120
121# define SSL2_NUM_CIPHERS (sizeof(ssl2_ciphers)/sizeof(SSL_CIPHER))
122
123/* list of available SSLv2 ciphers (sorted by id) */
124OPENSSL_GLOBAL const SSL_CIPHER ssl2_ciphers[] = {
125# if 0
126/* NULL_WITH_MD5 v3 */
127    {
128     1,
129     SSL2_TXT_NULL_WITH_MD5,
130     SSL2_CK_NULL_WITH_MD5,
131     SSL_kRSA,
132     SSL_aRSA,
133     SSL_eNULL,
134     SSL_MD5,
135     SSL_SSLV2,
136     SSL_EXPORT | SSL_EXP40 | SSL_STRONG_NONE,
137     0,
138     0,
139     0,
140     },
141# endif
142
143/* RC4_128_WITH_MD5 */
144    {
145     1,
146     SSL2_TXT_RC4_128_WITH_MD5,
147     SSL2_CK_RC4_128_WITH_MD5,
148     SSL_kRSA,
149     SSL_aRSA,
150     SSL_RC4,
151     SSL_MD5,
152     SSL_SSLV2,
153     SSL_NOT_EXP | SSL_MEDIUM,
154     0,
155     128,
156     128,
157     },
158
159/* RC4_128_EXPORT40_WITH_MD5 */
160    {
161     1,
162     SSL2_TXT_RC4_128_EXPORT40_WITH_MD5,
163     SSL2_CK_RC4_128_EXPORT40_WITH_MD5,
164     SSL_kRSA,
165     SSL_aRSA,
166     SSL_RC4,
167     SSL_MD5,
168     SSL_SSLV2,
169     SSL_EXPORT | SSL_EXP40,
170     SSL2_CF_5_BYTE_ENC,
171     40,
172     128,
173     },
174
175/* RC2_128_CBC_WITH_MD5 */
176    {
177     1,
178     SSL2_TXT_RC2_128_CBC_WITH_MD5,
179     SSL2_CK_RC2_128_CBC_WITH_MD5,
180     SSL_kRSA,
181     SSL_aRSA,
182     SSL_RC2,
183     SSL_MD5,
184     SSL_SSLV2,
185     SSL_NOT_EXP | SSL_MEDIUM,
186     0,
187     128,
188     128,
189     },
190
191/* RC2_128_CBC_EXPORT40_WITH_MD5 */
192    {
193     1,
194     SSL2_TXT_RC2_128_CBC_EXPORT40_WITH_MD5,
195     SSL2_CK_RC2_128_CBC_EXPORT40_WITH_MD5,
196     SSL_kRSA,
197     SSL_aRSA,
198     SSL_RC2,
199     SSL_MD5,
200     SSL_SSLV2,
201     SSL_EXPORT | SSL_EXP40,
202     SSL2_CF_5_BYTE_ENC,
203     40,
204     128,
205     },
206
207# ifndef OPENSSL_NO_IDEA
208/* IDEA_128_CBC_WITH_MD5 */
209    {
210     1,
211     SSL2_TXT_IDEA_128_CBC_WITH_MD5,
212     SSL2_CK_IDEA_128_CBC_WITH_MD5,
213     SSL_kRSA,
214     SSL_aRSA,
215     SSL_IDEA,
216     SSL_MD5,
217     SSL_SSLV2,
218     SSL_NOT_EXP | SSL_MEDIUM,
219     0,
220     128,
221     128,
222     },
223# endif
224
225/* DES_64_CBC_WITH_MD5 */
226    {
227     1,
228     SSL2_TXT_DES_64_CBC_WITH_MD5,
229     SSL2_CK_DES_64_CBC_WITH_MD5,
230     SSL_kRSA,
231     SSL_aRSA,
232     SSL_DES,
233     SSL_MD5,
234     SSL_SSLV2,
235     SSL_NOT_EXP | SSL_LOW,
236     0,
237     56,
238     56,
239     },
240
241/* DES_192_EDE3_CBC_WITH_MD5 */
242    {
243     1,
244     SSL2_TXT_DES_192_EDE3_CBC_WITH_MD5,
245     SSL2_CK_DES_192_EDE3_CBC_WITH_MD5,
246     SSL_kRSA,
247     SSL_aRSA,
248     SSL_3DES,
249     SSL_MD5,
250     SSL_SSLV2,
251     SSL_NOT_EXP | SSL_HIGH,
252     0,
253     112,
254     168,
255     },
256
257# if 0
258/* RC4_64_WITH_MD5 */
259    {
260     1,
261     SSL2_TXT_RC4_64_WITH_MD5,
262     SSL2_CK_RC4_64_WITH_MD5,
263     SSL_kRSA,
264     SSL_aRSA,
265     SSL_RC4,
266     SSL_MD5,
267     SSL_SSLV2,
268     SSL_NOT_EXP | SSL_LOW,
269     SSL2_CF_8_BYTE_ENC,
270     64,
271     64,
272     },
273# endif
274
275# if 0
276/* NULL SSLeay (testing) */
277    {
278     0,
279     SSL2_TXT_NULL,
280     SSL2_CK_NULL,
281     0,
282     0,
283     0,
284     0,
285     SSL_SSLV2,
286     SSL_STRONG_NONE,
287     0,
288     0,
289     0,
290     },
291# endif
292
293/* end of list :-) */
294};
295
296long ssl2_default_timeout(void)
297{
298    return (300);
299}
300
301int ssl2_num_ciphers(void)
302{
303    return (SSL2_NUM_CIPHERS);
304}
305
306const SSL_CIPHER *ssl2_get_cipher(unsigned int u)
307{
308    if (u < SSL2_NUM_CIPHERS)
309        return (&(ssl2_ciphers[SSL2_NUM_CIPHERS - 1 - u]));
310    else
311        return (NULL);
312}
313
314int ssl2_pending(const SSL *s)
315{
316    return SSL_in_init(s) ? 0 : s->s2->ract_data_length;
317}
318
319int ssl2_new(SSL *s)
320{
321    SSL2_STATE *s2;
322
323    if ((s2 = OPENSSL_malloc(sizeof *s2)) == NULL)
324        goto err;
325    memset(s2, 0, sizeof *s2);
326
327# if SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER + 3 > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER + 2
328#  error "assertion failed"
329# endif
330
331    if ((s2->rbuf =
332         OPENSSL_malloc(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER + 2)) == NULL)
333        goto err;
334    /*
335     * wbuf needs one byte more because when using two-byte headers, we leave
336     * the first byte unused in do_ssl_write (s2_pkt.c)
337     */
338    if ((s2->wbuf =
339         OPENSSL_malloc(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER + 3)) == NULL)
340        goto err;
341    s->s2 = s2;
342
343    ssl2_clear(s);
344    return (1);
345 err:
346    if (s2 != NULL) {
347        if (s2->wbuf != NULL)
348            OPENSSL_free(s2->wbuf);
349        if (s2->rbuf != NULL)
350            OPENSSL_free(s2->rbuf);
351        OPENSSL_free(s2);
352    }
353    return (0);
354}
355
356void ssl2_free(SSL *s)
357{
358    SSL2_STATE *s2;
359
360    if (s == NULL)
361        return;
362
363    s2 = s->s2;
364    if (s2->rbuf != NULL)
365        OPENSSL_free(s2->rbuf);
366    if (s2->wbuf != NULL)
367        OPENSSL_free(s2->wbuf);
368    OPENSSL_cleanse(s2, sizeof *s2);
369    OPENSSL_free(s2);
370    s->s2 = NULL;
371}
372
373void ssl2_clear(SSL *s)
374{
375    SSL2_STATE *s2;
376    unsigned char *rbuf, *wbuf;
377
378    s2 = s->s2;
379
380    rbuf = s2->rbuf;
381    wbuf = s2->wbuf;
382
383    memset(s2, 0, sizeof *s2);
384
385    s2->rbuf = rbuf;
386    s2->wbuf = wbuf;
387    s2->clear_text = 1;
388    s->packet = s2->rbuf;
389    s->version = SSL2_VERSION;
390    s->packet_length = 0;
391}
392
393long ssl2_ctrl(SSL *s, int cmd, long larg, void *parg)
394{
395    int ret = 0;
396
397    switch (cmd) {
398    case SSL_CTRL_GET_SESSION_REUSED:
399        ret = s->hit;
400        break;
401    case SSL_CTRL_CHECK_PROTO_VERSION:
402        return ssl3_ctrl(s, SSL_CTRL_CHECK_PROTO_VERSION, larg, parg);
403    default:
404        break;
405    }
406    return (ret);
407}
408
409long ssl2_callback_ctrl(SSL *s, int cmd, void (*fp) (void))
410{
411    return (0);
412}
413
414long ssl2_ctx_ctrl(SSL_CTX *ctx, int cmd, long larg, void *parg)
415{
416    return (0);
417}
418
419long ssl2_ctx_callback_ctrl(SSL_CTX *ctx, int cmd, void (*fp) (void))
420{
421    return (0);
422}
423
424/*
425 * This function needs to check if the ciphers required are actually
426 * available
427 */
428const SSL_CIPHER *ssl2_get_cipher_by_char(const unsigned char *p)
429{
430    SSL_CIPHER c;
431    const SSL_CIPHER *cp;
432    unsigned long id;
433
434    id = 0x02000000L | ((unsigned long)p[0] << 16L) |
435        ((unsigned long)p[1] << 8L) | (unsigned long)p[2];
436    c.id = id;
437    cp = OBJ_bsearch_ssl_cipher_id(&c, ssl2_ciphers, SSL2_NUM_CIPHERS);
438    if ((cp == NULL) || (cp->valid == 0))
439        return NULL;
440    else
441        return cp;
442}
443
444int ssl2_put_cipher_by_char(const SSL_CIPHER *c, unsigned char *p)
445{
446    long l;
447
448    if (p != NULL) {
449        l = c->id;
450        if ((l & 0xff000000) != 0x02000000 && l != SSL3_CK_FALLBACK_SCSV)
451            return (0);
452        p[0] = ((unsigned char)(l >> 16L)) & 0xFF;
453        p[1] = ((unsigned char)(l >> 8L)) & 0xFF;
454        p[2] = ((unsigned char)(l)) & 0xFF;
455    }
456    return (3);
457}
458
459int ssl2_generate_key_material(SSL *s)
460{
461    unsigned int i;
462    EVP_MD_CTX ctx;
463    unsigned char *km;
464    unsigned char c = '0';
465    const EVP_MD *md5;
466    int md_size;
467
468    md5 = EVP_md5();
469
470# ifdef CHARSET_EBCDIC
471    c = os_toascii['0'];        /* Must be an ASCII '0', not EBCDIC '0', see
472                                 * SSLv2 docu */
473# endif
474    EVP_MD_CTX_init(&ctx);
475    km = s->s2->key_material;
476
477    if (s->session->master_key_length < 0 ||
478        s->session->master_key_length > (int)sizeof(s->session->master_key)) {
479        SSLerr(SSL_F_SSL2_GENERATE_KEY_MATERIAL, ERR_R_INTERNAL_ERROR);
480        return 0;
481    }
482    md_size = EVP_MD_size(md5);
483    if (md_size < 0)
484        return 0;
485    for (i = 0; i < s->s2->key_material_length; i += md_size) {
486        if (((km - s->s2->key_material) + md_size) >
487            (int)sizeof(s->s2->key_material)) {
488            /*
489             * EVP_DigestFinal_ex() below would write beyond buffer
490             */
491            SSLerr(SSL_F_SSL2_GENERATE_KEY_MATERIAL, ERR_R_INTERNAL_ERROR);
492            return 0;
493        }
494
495        EVP_DigestInit_ex(&ctx, md5, NULL);
496
497        OPENSSL_assert(s->session->master_key_length >= 0
498                       && s->session->master_key_length
499                       <= (int)sizeof(s->session->master_key));
500        EVP_DigestUpdate(&ctx, s->session->master_key,
501                         s->session->master_key_length);
502        EVP_DigestUpdate(&ctx, &c, 1);
503        c++;
504        EVP_DigestUpdate(&ctx, s->s2->challenge, s->s2->challenge_length);
505        EVP_DigestUpdate(&ctx, s->s2->conn_id, s->s2->conn_id_length);
506        EVP_DigestFinal_ex(&ctx, km, NULL);
507        km += md_size;
508    }
509
510    EVP_MD_CTX_cleanup(&ctx);
511    return 1;
512}
513
514void ssl2_return_error(SSL *s, int err)
515{
516    if (!s->error) {
517        s->error = 3;
518        s->error_code = err;
519
520        ssl2_write_error(s);
521    }
522}
523
524void ssl2_write_error(SSL *s)
525{
526    unsigned char buf[3];
527    int i, error;
528
529    buf[0] = SSL2_MT_ERROR;
530    buf[1] = (s->error_code >> 8) & 0xff;
531    buf[2] = (s->error_code) & 0xff;
532
533/*      state=s->rwstate;*/
534
535    error = s->error;           /* number of bytes left to write */
536    s->error = 0;
537    OPENSSL_assert(error >= 0 && error <= (int)sizeof(buf));
538    i = ssl2_write(s, &(buf[3 - error]), error);
539
540/*      if (i == error) s->rwstate=state; */
541
542    if (i < 0)
543        s->error = error;
544    else {
545        s->error = error - i;
546
547        if (s->error == 0)
548            if (s->msg_callback) {
549                /* ERROR */
550                s->msg_callback(1, s->version, 0, buf, 3, s,
551                                s->msg_callback_arg);
552            }
553    }
554}
555
556int ssl2_shutdown(SSL *s)
557{
558    s->shutdown = (SSL_SENT_SHUTDOWN | SSL_RECEIVED_SHUTDOWN);
559    return (1);
560}
561#else                           /* !OPENSSL_NO_SSL2 */
562
563# if PEDANTIC
564static void *dummy = &dummy;
565# endif
566
567#endif
568