s2_lib.c revision 296465 
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#include "ssl_locl.h"
60#ifndef OPENSSL_NO_SSL2
61# include <stdio.h>
62# include <openssl/objects.h>
63# include <openssl/evp.h>
64# include <openssl/md5.h>
65
66const char ssl2_version_str[] = "SSLv2" OPENSSL_VERSION_PTEXT;
67
68# define SSL2_NUM_CIPHERS (sizeof(ssl2_ciphers)/sizeof(SSL_CIPHER))
69
70/* list of available SSLv2 ciphers (sorted by id) */
71OPENSSL_GLOBAL SSL_CIPHER ssl2_ciphers[] = {
72/* NULL_WITH_MD5 v3 */
73# if 0
74    {
75     1,
76     SSL2_TXT_NULL_WITH_MD5,
77     SSL2_CK_NULL_WITH_MD5,
78     SSL_kRSA | SSL_aRSA | SSL_eNULL | SSL_MD5 | SSL_SSLV2,
79     SSL_EXPORT | SSL_EXP40 | SSL_STRONG_NONE,
80     0,
81     0,
82     0,
83     SSL_ALL_CIPHERS,
84     SSL_ALL_STRENGTHS,
85     },
86# endif
87/* RC4_128_WITH_MD5 */
88    {
89     1,
90     SSL2_TXT_RC4_128_WITH_MD5,
91     SSL2_CK_RC4_128_WITH_MD5,
92     SSL_kRSA | SSL_aRSA | SSL_RC4 | SSL_MD5 | SSL_SSLV2,
93     SSL_NOT_EXP | SSL_MEDIUM,
94     0,
95     128,
96     128,
97     SSL_ALL_CIPHERS,
98     SSL_ALL_STRENGTHS,
99     },
100
101# if 0
102/* RC4_128_EXPORT40_WITH_MD5 */
103    {
104     1,
105     SSL2_TXT_RC4_128_EXPORT40_WITH_MD5,
106     SSL2_CK_RC4_128_EXPORT40_WITH_MD5,
107     SSL_kRSA | SSL_aRSA | SSL_RC4 | SSL_MD5 | SSL_SSLV2,
108     SSL_EXPORT | SSL_EXP40,
109     SSL2_CF_5_BYTE_ENC,
110     40,
111     128,
112     SSL_ALL_CIPHERS,
113     SSL_ALL_STRENGTHS,
114     },
115# endif
116
117/* RC2_128_CBC_WITH_MD5 */
118    {
119     1,
120     SSL2_TXT_RC2_128_CBC_WITH_MD5,
121     SSL2_CK_RC2_128_CBC_WITH_MD5,
122     SSL_kRSA | SSL_aRSA | SSL_RC2 | SSL_MD5 | SSL_SSLV2,
123     SSL_NOT_EXP | SSL_MEDIUM,
124     0,
125     128,
126     128,
127     SSL_ALL_CIPHERS,
128     SSL_ALL_STRENGTHS,
129     },
130
131# if 0
132/* RC2_128_CBC_EXPORT40_WITH_MD5 */
133    {
134     1,
135     SSL2_TXT_RC2_128_CBC_EXPORT40_WITH_MD5,
136     SSL2_CK_RC2_128_CBC_EXPORT40_WITH_MD5,
137     SSL_kRSA | SSL_aRSA | SSL_RC2 | SSL_MD5 | SSL_SSLV2,
138     SSL_EXPORT | SSL_EXP40,
139     SSL2_CF_5_BYTE_ENC,
140     40,
141     128,
142     SSL_ALL_CIPHERS,
143     SSL_ALL_STRENGTHS,
144     },
145# endif
146
147/* IDEA_128_CBC_WITH_MD5 */
148# ifndef OPENSSL_NO_IDEA
149    {
150     1,
151     SSL2_TXT_IDEA_128_CBC_WITH_MD5,
152     SSL2_CK_IDEA_128_CBC_WITH_MD5,
153     SSL_kRSA | SSL_aRSA | SSL_IDEA | SSL_MD5 | SSL_SSLV2,
154     SSL_NOT_EXP | SSL_MEDIUM,
155     0,
156     128,
157     128,
158     SSL_ALL_CIPHERS,
159     SSL_ALL_STRENGTHS,
160     },
161# endif
162
163# if 0
164/* DES_64_CBC_WITH_MD5 */
165    {
166     1,
167     SSL2_TXT_DES_64_CBC_WITH_MD5,
168     SSL2_CK_DES_64_CBC_WITH_MD5,
169     SSL_kRSA | SSL_aRSA | SSL_DES | SSL_MD5 | SSL_SSLV2,
170     SSL_NOT_EXP | SSL_LOW,
171     0,
172     56,
173     56,
174     SSL_ALL_CIPHERS,
175     SSL_ALL_STRENGTHS,
176     },
177# endif
178
179/* DES_192_EDE3_CBC_WITH_MD5 */
180    {
181     1,
182     SSL2_TXT_DES_192_EDE3_CBC_WITH_MD5,
183     SSL2_CK_DES_192_EDE3_CBC_WITH_MD5,
184     SSL_kRSA | SSL_aRSA | SSL_3DES | SSL_MD5 | SSL_SSLV2,
185     SSL_NOT_EXP | SSL_HIGH,
186     0,
187     168,
188     168,
189     SSL_ALL_CIPHERS,
190     SSL_ALL_STRENGTHS,
191     },
192/* RC4_64_WITH_MD5 */
193# if 0
194    {
195     1,
196     SSL2_TXT_RC4_64_WITH_MD5,
197     SSL2_CK_RC4_64_WITH_MD5,
198     SSL_kRSA | SSL_aRSA | SSL_RC4 | SSL_MD5 | SSL_SSLV2,
199     SSL_NOT_EXP | SSL_LOW,
200     SSL2_CF_8_BYTE_ENC,
201     64,
202     64,
203     SSL_ALL_CIPHERS,
204     SSL_ALL_STRENGTHS,
205     },
206# endif
207/* NULL SSLeay (testing) */
208# if 0
209    {
210     0,
211     SSL2_TXT_NULL,
212     SSL2_CK_NULL,
213     0,
214     SSL_STRONG_NONE,
215     0,
216     0,
217     0,
218     SSL_ALL_CIPHERS,
219     SSL_ALL_STRENGTHS,
220     },
221# endif
222
223/* end of list :-) */
224};
225
226long ssl2_default_timeout(void)
227{
228    return (300);
229}
230
231IMPLEMENT_ssl2_meth_func(sslv2_base_method,
232                         ssl_undefined_function,
233                         ssl_undefined_function, ssl_bad_method)
234
235int ssl2_num_ciphers(void)
236{
237    return (SSL2_NUM_CIPHERS);
238}
239
240SSL_CIPHER *ssl2_get_cipher(unsigned int u)
241{
242    if (u < SSL2_NUM_CIPHERS)
243        return (&(ssl2_ciphers[SSL2_NUM_CIPHERS - 1 - u]));
244    else
245        return (NULL);
246}
247
248int ssl2_pending(const SSL *s)
249{
250    return SSL_in_init(s) ? 0 : s->s2->ract_data_length;
251}
252
253int ssl2_new(SSL *s)
254{
255    SSL2_STATE *s2;
256
257    if ((s2 = OPENSSL_malloc(sizeof *s2)) == NULL)
258        goto err;
259    memset(s2, 0, sizeof *s2);
260
261# if SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER + 3 > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER + 2
262#  error "assertion failed"
263# endif
264
265    if ((s2->rbuf =
266         OPENSSL_malloc(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER + 2)) == NULL)
267        goto err;
268    /*
269     * wbuf needs one byte more because when using two-byte headers, we leave
270     * the first byte unused in do_ssl_write (s2_pkt.c)
271     */
272    if ((s2->wbuf =
273         OPENSSL_malloc(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER + 3)) == NULL)
274        goto err;
275    s->s2 = s2;
276
277    ssl2_clear(s);
278    return (1);
279 err:
280    if (s2 != NULL) {
281        if (s2->wbuf != NULL)
282            OPENSSL_free(s2->wbuf);
283        if (s2->rbuf != NULL)
284            OPENSSL_free(s2->rbuf);
285        OPENSSL_free(s2);
286    }
287    return (0);
288}
289
290void ssl2_free(SSL *s)
291{
292    SSL2_STATE *s2;
293
294    if (s == NULL)
295        return;
296
297    s2 = s->s2;
298    if (s2->rbuf != NULL)
299        OPENSSL_free(s2->rbuf);
300    if (s2->wbuf != NULL)
301        OPENSSL_free(s2->wbuf);
302    OPENSSL_cleanse(s2, sizeof *s2);
303    OPENSSL_free(s2);
304    s->s2 = NULL;
305}
306
307void ssl2_clear(SSL *s)
308{
309    SSL2_STATE *s2;
310    unsigned char *rbuf, *wbuf;
311
312    s2 = s->s2;
313
314    rbuf = s2->rbuf;
315    wbuf = s2->wbuf;
316
317    memset(s2, 0, sizeof *s2);
318
319    s2->rbuf = rbuf;
320    s2->wbuf = wbuf;
321    s2->clear_text = 1;
322    s->packet = s2->rbuf;
323    s->version = SSL2_VERSION;
324    s->packet_length = 0;
325}
326
327long ssl2_ctrl(SSL *s, int cmd, long larg, void *parg)
328{
329    int ret = 0;
330
331    switch (cmd) {
332    case SSL_CTRL_GET_SESSION_REUSED:
333        ret = s->hit;
334        break;
335    case SSL_CTRL_CHECK_PROTO_VERSION:
336        return ssl3_ctrl(s, SSL_CTRL_CHECK_PROTO_VERSION, larg, parg);
337    default:
338        break;
339    }
340    return (ret);
341}
342
343long ssl2_callback_ctrl(SSL *s, int cmd, void (*fp) (void))
344{
345    return (0);
346}
347
348long ssl2_ctx_ctrl(SSL_CTX *ctx, int cmd, long larg, void *parg)
349{
350    return (0);
351}
352
353long ssl2_ctx_callback_ctrl(SSL_CTX *ctx, int cmd, void (*fp) (void))
354{
355    return (0);
356}
357
358/*
359 * This function needs to check if the ciphers required are actually
360 * available
361 */
362SSL_CIPHER *ssl2_get_cipher_by_char(const unsigned char *p)
363{
364    SSL_CIPHER c, *cp;
365    unsigned long id;
366
367    id = 0x02000000L | ((unsigned long)p[0] << 16L) |
368        ((unsigned long)p[1] << 8L) | (unsigned long)p[2];
369    c.id = id;
370    cp = (SSL_CIPHER *)OBJ_bsearch((char *)&c,
371                                   (char *)ssl2_ciphers,
372                                   SSL2_NUM_CIPHERS, sizeof(SSL_CIPHER),
373                                   FP_ICC ssl_cipher_id_cmp);
374    if ((cp == NULL) || (cp->valid == 0))
375        return NULL;
376    else
377        return cp;
378}
379
380int ssl2_put_cipher_by_char(const SSL_CIPHER *c, unsigned char *p)
381{
382    long l;
383
384    if (p != NULL) {
385        l = c->id;
386        if ((l & 0xff000000) != 0x02000000 && l != SSL3_CK_FALLBACK_SCSV)
387            return (0);
388        p[0] = ((unsigned char)(l >> 16L)) & 0xFF;
389        p[1] = ((unsigned char)(l >> 8L)) & 0xFF;
390        p[2] = ((unsigned char)(l)) & 0xFF;
391    }
392    return (3);
393}
394
395int ssl2_generate_key_material(SSL *s)
396{
397    unsigned int i;
398    EVP_MD_CTX ctx;
399    unsigned char *km;
400    unsigned char c = '0';
401    const EVP_MD *md5;
402
403    md5 = EVP_md5();
404
405# ifdef CHARSET_EBCDIC
406    c = os_toascii['0'];        /* Must be an ASCII '0', not EBCDIC '0', see
407                                 * SSLv2 docu */
408# endif
409    EVP_MD_CTX_init(&ctx);
410    km = s->s2->key_material;
411
412    if (s->session->master_key_length < 0 ||
413        s->session->master_key_length > (int)sizeof(s->session->master_key)) {
414        SSLerr(SSL_F_SSL2_GENERATE_KEY_MATERIAL, ERR_R_INTERNAL_ERROR);
415        return 0;
416    }
417
418    for (i = 0; i < s->s2->key_material_length; i += EVP_MD_size(md5)) {
419        if (((km - s->s2->key_material) + EVP_MD_size(md5)) >
420            (int)sizeof(s->s2->key_material)) {
421            /*
422             * EVP_DigestFinal_ex() below would write beyond buffer
423             */
424            SSLerr(SSL_F_SSL2_GENERATE_KEY_MATERIAL, ERR_R_INTERNAL_ERROR);
425            return 0;
426        }
427
428        EVP_DigestInit_ex(&ctx, md5, NULL);
429
430        OPENSSL_assert(s->session->master_key_length >= 0
431                       && s->session->master_key_length
432                       <= (int)sizeof(s->session->master_key));
433        EVP_DigestUpdate(&ctx, s->session->master_key,
434                         s->session->master_key_length);
435        EVP_DigestUpdate(&ctx, &c, 1);
436        c++;
437        EVP_DigestUpdate(&ctx, s->s2->challenge, s->s2->challenge_length);
438        EVP_DigestUpdate(&ctx, s->s2->conn_id, s->s2->conn_id_length);
439        EVP_DigestFinal_ex(&ctx, km, NULL);
440        km += EVP_MD_size(md5);
441    }
442
443    EVP_MD_CTX_cleanup(&ctx);
444    return 1;
445}
446
447void ssl2_return_error(SSL *s, int err)
448{
449    if (!s->error) {
450        s->error = 3;
451        s->error_code = err;
452
453        ssl2_write_error(s);
454    }
455}
456
457void ssl2_write_error(SSL *s)
458{
459    unsigned char buf[3];
460    int i, error;
461
462    buf[0] = SSL2_MT_ERROR;
463    buf[1] = (s->error_code >> 8) & 0xff;
464    buf[2] = (s->error_code) & 0xff;
465
466/*      state=s->rwstate;*/
467
468    error = s->error;           /* number of bytes left to write */
469    s->error = 0;
470    OPENSSL_assert(error >= 0 && error <= (int)sizeof(buf));
471    i = ssl2_write(s, &(buf[3 - error]), error);
472
473/*      if (i == error) s->rwstate=state; */
474
475    if (i < 0)
476        s->error = error;
477    else {
478        s->error = error - i;
479
480        if (s->error == 0)
481            if (s->msg_callback) {
482                /* ERROR */
483                s->msg_callback(1, s->version, 0, buf, 3, s,
484                                s->msg_callback_arg);
485            }
486    }
487}
488
489int ssl2_shutdown(SSL *s)
490{
491    s->shutdown = (SSL_SENT_SHUTDOWN | SSL_RECEIVED_SHUTDOWN);
492    return (1);
493}
494#else                           /* !OPENSSL_NO_SSL2 */
495
496# if PEDANTIC
497static void *dummy = &dummy;
498# endif
499
500#endif
501