a8ce186b783f2d468742c055c7df6bba752791ff
[dragonfly.git] / crypto / openssl / ssl / ssl_ciph.c
1 /* ssl/ssl_ciph.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  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113  * ECC cipher suite support in OpenSSL originally developed by 
114  * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
115  */
116 /* ====================================================================
117  * Copyright 2005 Nokia. All rights reserved.
118  *
119  * The portions of the attached software ("Contribution") is developed by
120  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
121  * license.
122  *
123  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
124  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
125  * support (see RFC 4279) to OpenSSL.
126  *
127  * No patent licenses or other rights except those expressly stated in
128  * the OpenSSL open source license shall be deemed granted or received
129  * expressly, by implication, estoppel, or otherwise.
130  *
131  * No assurances are provided by Nokia that the Contribution does not
132  * infringe the patent or other intellectual property rights of any third
133  * party or that the license provides you with all the necessary rights
134  * to make use of the Contribution.
135  *
136  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
137  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
138  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
139  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
140  * OTHERWISE.
141  */
142
143 #include <stdio.h>
144 #include <openssl/objects.h>
145 #ifndef OPENSSL_NO_COMP
146 #include <openssl/comp.h>
147 #endif
148 #ifndef OPENSSL_NO_ENGINE
149 #include <openssl/engine.h>
150 #endif
151 #include "ssl_locl.h"
152
153 #define SSL_ENC_DES_IDX         0
154 #define SSL_ENC_3DES_IDX        1
155 #define SSL_ENC_RC4_IDX         2
156 #define SSL_ENC_RC2_IDX         3
157 #define SSL_ENC_IDEA_IDX        4
158 #define SSL_ENC_NULL_IDX        5
159 #define SSL_ENC_AES128_IDX      6
160 #define SSL_ENC_AES256_IDX      7
161 #define SSL_ENC_CAMELLIA128_IDX 8
162 #define SSL_ENC_CAMELLIA256_IDX 9
163 #define SSL_ENC_GOST89_IDX      10
164 #define SSL_ENC_SEED_IDX        11
165 #define SSL_ENC_NUM_IDX         12
166
167
168 static const EVP_CIPHER *ssl_cipher_methods[SSL_ENC_NUM_IDX]={
169         NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,
170         };
171
172 #define SSL_COMP_NULL_IDX       0
173 #define SSL_COMP_ZLIB_IDX       1
174 #define SSL_COMP_NUM_IDX        2
175
176 static STACK_OF(SSL_COMP) *ssl_comp_methods=NULL;
177
178 #define SSL_MD_MD5_IDX  0
179 #define SSL_MD_SHA1_IDX 1
180 #define SSL_MD_GOST94_IDX 2
181 #define SSL_MD_GOST89MAC_IDX 3
182 /*Constant SSL_MAX_DIGEST equal to size of digests array should be 
183  * defined in the
184  * ssl_locl.h */
185 #define SSL_MD_NUM_IDX  SSL_MAX_DIGEST 
186 static const EVP_MD *ssl_digest_methods[SSL_MD_NUM_IDX]={
187         NULL,NULL,NULL,NULL
188         };
189 /* PKEY_TYPE for GOST89MAC is known in advance, but, because
190  * implementation is engine-provided, we'll fill it only if
191  * corresponding EVP_PKEY_METHOD is found 
192  */
193 static int  ssl_mac_pkey_id[SSL_MD_NUM_IDX]={
194         EVP_PKEY_HMAC,EVP_PKEY_HMAC,EVP_PKEY_HMAC,NID_undef
195         };
196
197 static int ssl_mac_secret_size[SSL_MD_NUM_IDX]={
198         0,0,0,0
199         };
200
201 static int ssl_handshake_digest_flag[SSL_MD_NUM_IDX]={
202         SSL_HANDSHAKE_MAC_MD5,SSL_HANDSHAKE_MAC_SHA,
203         SSL_HANDSHAKE_MAC_GOST94,0
204         };
205
206 #define CIPHER_ADD      1
207 #define CIPHER_KILL     2
208 #define CIPHER_DEL      3
209 #define CIPHER_ORD      4
210 #define CIPHER_SPECIAL  5
211
212 typedef struct cipher_order_st
213         {
214         const SSL_CIPHER *cipher;
215         int active;
216         int dead;
217         struct cipher_order_st *next,*prev;
218         } CIPHER_ORDER;
219
220 static const SSL_CIPHER cipher_aliases[]={
221         /* "ALL" doesn't include eNULL (must be specifically enabled) */
222         {0,SSL_TXT_ALL,0,     0,0,~SSL_eNULL,0,0,0,0,0,0},
223         /* "COMPLEMENTOFALL" */
224         {0,SSL_TXT_CMPALL,0,  0,0,SSL_eNULL,0,0,0,0,0,0},
225
226         /* "COMPLEMENTOFDEFAULT" (does *not* include ciphersuites not found in ALL!) */
227         {0,SSL_TXT_CMPDEF,0,  SSL_kEDH|SSL_kEECDH,SSL_aNULL,~SSL_eNULL,0,0,0,0,0,0},
228
229         /* key exchange aliases
230          * (some of those using only a single bit here combine
231          * multiple key exchange algs according to the RFCs,
232          * e.g. kEDH combines DHE_DSS and DHE_RSA) */
233         {0,SSL_TXT_kRSA,0,    SSL_kRSA,  0,0,0,0,0,0,0,0},
234
235         {0,SSL_TXT_kDHr,0,    SSL_kDHr,  0,0,0,0,0,0,0,0}, /* no such ciphersuites supported! */
236         {0,SSL_TXT_kDHd,0,    SSL_kDHd,  0,0,0,0,0,0,0,0}, /* no such ciphersuites supported! */
237         {0,SSL_TXT_kDH,0,     SSL_kDHr|SSL_kDHd,0,0,0,0,0,0,0,0}, /* no such ciphersuites supported! */
238         {0,SSL_TXT_kEDH,0,    SSL_kEDH,  0,0,0,0,0,0,0,0},
239         {0,SSL_TXT_DH,0,      SSL_kDHr|SSL_kDHd|SSL_kEDH,0,0,0,0,0,0,0,0},
240
241         {0,SSL_TXT_kKRB5,0,   SSL_kKRB5, 0,0,0,0,0,0,0,0},
242
243         {0,SSL_TXT_kECDHr,0,  SSL_kECDHr,0,0,0,0,0,0,0,0},
244         {0,SSL_TXT_kECDHe,0,  SSL_kECDHe,0,0,0,0,0,0,0,0},
245         {0,SSL_TXT_kECDH,0,   SSL_kECDHr|SSL_kECDHe,0,0,0,0,0,0,0,0},
246         {0,SSL_TXT_kEECDH,0,  SSL_kEECDH,0,0,0,0,0,0,0,0},
247         {0,SSL_TXT_ECDH,0,    SSL_kECDHr|SSL_kECDHe|SSL_kEECDH,0,0,0,0,0,0,0,0},
248
249         {0,SSL_TXT_kPSK,0,    SSL_kPSK,  0,0,0,0,0,0,0,0},
250         {0,SSL_TXT_kGOST,0, SSL_kGOST,0,0,0,0,0,0,0,0},
251
252         /* server authentication aliases */
253         {0,SSL_TXT_aRSA,0,    0,SSL_aRSA,  0,0,0,0,0,0,0},
254         {0,SSL_TXT_aDSS,0,    0,SSL_aDSS,  0,0,0,0,0,0,0},
255         {0,SSL_TXT_DSS,0,     0,SSL_aDSS,   0,0,0,0,0,0,0},
256         {0,SSL_TXT_aKRB5,0,   0,SSL_aKRB5, 0,0,0,0,0,0,0},
257         {0,SSL_TXT_aNULL,0,   0,SSL_aNULL, 0,0,0,0,0,0,0},
258         {0,SSL_TXT_aDH,0,     0,SSL_aDH,   0,0,0,0,0,0,0}, /* no such ciphersuites supported! */
259         {0,SSL_TXT_aECDH,0,   0,SSL_aECDH, 0,0,0,0,0,0,0},
260         {0,SSL_TXT_aECDSA,0,  0,SSL_aECDSA,0,0,0,0,0,0,0},
261         {0,SSL_TXT_ECDSA,0,   0,SSL_aECDSA, 0,0,0,0,0,0,0},
262         {0,SSL_TXT_aPSK,0,    0,SSL_aPSK,  0,0,0,0,0,0,0},
263         {0,SSL_TXT_aGOST94,0,0,SSL_aGOST94,0,0,0,0,0,0,0},
264         {0,SSL_TXT_aGOST01,0,0,SSL_aGOST01,0,0,0,0,0,0,0},
265         {0,SSL_TXT_aGOST,0,0,SSL_aGOST94|SSL_aGOST01,0,0,0,0,0,0,0},
266
267         /* aliases combining key exchange and server authentication */
268         {0,SSL_TXT_EDH,0,     SSL_kEDH,~SSL_aNULL,0,0,0,0,0,0,0},
269         {0,SSL_TXT_EECDH,0,   SSL_kEECDH,~SSL_aNULL,0,0,0,0,0,0,0},
270         {0,SSL_TXT_NULL,0,    0,0,SSL_eNULL, 0,0,0,0,0,0},
271         {0,SSL_TXT_KRB5,0,    SSL_kKRB5,SSL_aKRB5,0,0,0,0,0,0,0},
272         {0,SSL_TXT_RSA,0,     SSL_kRSA,SSL_aRSA,0,0,0,0,0,0,0},
273         {0,SSL_TXT_ADH,0,     SSL_kEDH,SSL_aNULL,0,0,0,0,0,0,0},
274         {0,SSL_TXT_AECDH,0,   SSL_kEECDH,SSL_aNULL,0,0,0,0,0,0,0},
275         {0,SSL_TXT_PSK,0,     SSL_kPSK,SSL_aPSK,0,0,0,0,0,0,0},
276
277
278         /* symmetric encryption aliases */
279         {0,SSL_TXT_DES,0,     0,0,SSL_DES,   0,0,0,0,0,0},
280         {0,SSL_TXT_3DES,0,    0,0,SSL_3DES,  0,0,0,0,0,0},
281         {0,SSL_TXT_RC4,0,     0,0,SSL_RC4,   0,0,0,0,0,0},
282         {0,SSL_TXT_RC2,0,     0,0,SSL_RC2,   0,0,0,0,0,0},
283         {0,SSL_TXT_IDEA,0,    0,0,SSL_IDEA,  0,0,0,0,0,0},
284         {0,SSL_TXT_SEED,0,    0,0,SSL_SEED,  0,0,0,0,0,0},
285         {0,SSL_TXT_eNULL,0,   0,0,SSL_eNULL, 0,0,0,0,0,0},
286         {0,SSL_TXT_AES128,0,  0,0,SSL_AES128,0,0,0,0,0,0},
287         {0,SSL_TXT_AES256,0,  0,0,SSL_AES256,0,0,0,0,0,0},
288         {0,SSL_TXT_AES,0,     0,0,SSL_AES128|SSL_AES256,0,0,0,0,0,0},
289         {0,SSL_TXT_CAMELLIA128,0,0,0,SSL_CAMELLIA128,0,0,0,0,0,0},
290         {0,SSL_TXT_CAMELLIA256,0,0,0,SSL_CAMELLIA256,0,0,0,0,0,0},
291         {0,SSL_TXT_CAMELLIA   ,0,0,0,SSL_CAMELLIA128|SSL_CAMELLIA256,0,0,0,0,0,0},
292
293         /* MAC aliases */       
294         {0,SSL_TXT_MD5,0,     0,0,0,SSL_MD5,   0,0,0,0,0},
295         {0,SSL_TXT_SHA1,0,    0,0,0,SSL_SHA1,  0,0,0,0,0},
296         {0,SSL_TXT_SHA,0,     0,0,0,SSL_SHA1,  0,0,0,0,0},
297         {0,SSL_TXT_GOST94,0,     0,0,0,SSL_GOST94,  0,0,0,0,0},
298         {0,SSL_TXT_GOST89MAC,0,     0,0,0,SSL_GOST89MAC,  0,0,0,0,0},
299
300         /* protocol version aliases */
301         {0,SSL_TXT_SSLV2,0,   0,0,0,0,SSL_SSLV2, 0,0,0,0},
302         {0,SSL_TXT_SSLV3,0,   0,0,0,0,SSL_SSLV3, 0,0,0,0},
303         {0,SSL_TXT_TLSV1,0,   0,0,0,0,SSL_TLSV1, 0,0,0,0},
304
305         /* export flag */
306         {0,SSL_TXT_EXP,0,     0,0,0,0,0,SSL_EXPORT,0,0,0},
307         {0,SSL_TXT_EXPORT,0,  0,0,0,0,0,SSL_EXPORT,0,0,0},
308
309         /* strength classes */
310         {0,SSL_TXT_EXP40,0,   0,0,0,0,0,SSL_EXP40, 0,0,0},
311         {0,SSL_TXT_EXP56,0,   0,0,0,0,0,SSL_EXP56, 0,0,0},
312         {0,SSL_TXT_LOW,0,     0,0,0,0,0,SSL_LOW,   0,0,0},
313         {0,SSL_TXT_MEDIUM,0,  0,0,0,0,0,SSL_MEDIUM,0,0,0},
314         {0,SSL_TXT_HIGH,0,    0,0,0,0,0,SSL_HIGH,  0,0,0},
315         /* FIPS 140-2 approved ciphersuite */
316         {0,SSL_TXT_FIPS,0,    0,0,~SSL_eNULL,0,0,SSL_FIPS,  0,0,0},
317         };
318 /* Search for public key algorithm with given name and 
319  * return its pkey_id if it is available. Otherwise return 0
320  */
321 #ifdef OPENSSL_NO_ENGINE
322
323 static int get_optional_pkey_id(const char *pkey_name)
324         {
325         const EVP_PKEY_ASN1_METHOD *ameth;
326         int pkey_id=0;
327         ameth = EVP_PKEY_asn1_find_str(NULL,pkey_name,-1);
328         if (ameth) 
329                 {
330                 EVP_PKEY_asn1_get0_info(&pkey_id, NULL,NULL,NULL,NULL,ameth);
331                 }               
332         return pkey_id;
333         }
334
335 #else
336
337 static int get_optional_pkey_id(const char *pkey_name)
338         {
339         const EVP_PKEY_ASN1_METHOD *ameth;
340         ENGINE *tmpeng = NULL;
341         int pkey_id=0;
342         ameth = EVP_PKEY_asn1_find_str(&tmpeng,pkey_name,-1);
343         if (ameth)
344                 {
345                 EVP_PKEY_asn1_get0_info(&pkey_id, NULL,NULL,NULL,NULL,ameth);
346                 }
347         if (tmpeng) ENGINE_finish(tmpeng);
348         return pkey_id;
349         }
350
351 #endif
352
353 void ssl_load_ciphers(void)
354         {
355         ssl_cipher_methods[SSL_ENC_DES_IDX]= 
356                 EVP_get_cipherbyname(SN_des_cbc);
357         ssl_cipher_methods[SSL_ENC_3DES_IDX]=
358                 EVP_get_cipherbyname(SN_des_ede3_cbc);
359         ssl_cipher_methods[SSL_ENC_RC4_IDX]=
360                 EVP_get_cipherbyname(SN_rc4);
361         ssl_cipher_methods[SSL_ENC_RC2_IDX]= 
362                 EVP_get_cipherbyname(SN_rc2_cbc);
363 #ifndef OPENSSL_NO_IDEA
364         ssl_cipher_methods[SSL_ENC_IDEA_IDX]= 
365                 EVP_get_cipherbyname(SN_idea_cbc);
366 #else
367         ssl_cipher_methods[SSL_ENC_IDEA_IDX]= NULL;
368 #endif
369         ssl_cipher_methods[SSL_ENC_AES128_IDX]=
370           EVP_get_cipherbyname(SN_aes_128_cbc);
371         ssl_cipher_methods[SSL_ENC_AES256_IDX]=
372           EVP_get_cipherbyname(SN_aes_256_cbc);
373         ssl_cipher_methods[SSL_ENC_CAMELLIA128_IDX]=
374           EVP_get_cipherbyname(SN_camellia_128_cbc);
375         ssl_cipher_methods[SSL_ENC_CAMELLIA256_IDX]=
376           EVP_get_cipherbyname(SN_camellia_256_cbc);
377         ssl_cipher_methods[SSL_ENC_GOST89_IDX]=
378           EVP_get_cipherbyname(SN_gost89_cnt);
379         ssl_cipher_methods[SSL_ENC_SEED_IDX]=
380           EVP_get_cipherbyname(SN_seed_cbc);
381
382         ssl_digest_methods[SSL_MD_MD5_IDX]=
383                 EVP_get_digestbyname(SN_md5);
384         ssl_mac_secret_size[SSL_MD_MD5_IDX]=
385                 EVP_MD_size(ssl_digest_methods[SSL_MD_MD5_IDX]);
386         OPENSSL_assert(ssl_mac_secret_size[SSL_MD_MD5_IDX] >= 0);
387         ssl_digest_methods[SSL_MD_SHA1_IDX]=
388                 EVP_get_digestbyname(SN_sha1);
389         ssl_mac_secret_size[SSL_MD_SHA1_IDX]=
390                 EVP_MD_size(ssl_digest_methods[SSL_MD_SHA1_IDX]);
391         OPENSSL_assert(ssl_mac_secret_size[SSL_MD_SHA1_IDX] >= 0);
392         ssl_digest_methods[SSL_MD_GOST94_IDX]=
393                 EVP_get_digestbyname(SN_id_GostR3411_94);
394         if (ssl_digest_methods[SSL_MD_GOST94_IDX])
395                 {       
396                 ssl_mac_secret_size[SSL_MD_GOST94_IDX]=
397                         EVP_MD_size(ssl_digest_methods[SSL_MD_GOST94_IDX]);
398                 OPENSSL_assert(ssl_mac_secret_size[SSL_MD_GOST94_IDX] >= 0);
399                 }
400         ssl_digest_methods[SSL_MD_GOST89MAC_IDX]=
401                 EVP_get_digestbyname(SN_id_Gost28147_89_MAC);
402                 ssl_mac_pkey_id[SSL_MD_GOST89MAC_IDX] = get_optional_pkey_id("gost-mac");
403                 if (ssl_mac_pkey_id[SSL_MD_GOST89MAC_IDX]) {
404                         ssl_mac_secret_size[SSL_MD_GOST89MAC_IDX]=32;
405                 }               
406
407         }
408 #ifndef OPENSSL_NO_COMP
409
410 static int sk_comp_cmp(const SSL_COMP * const *a,
411                         const SSL_COMP * const *b)
412         {
413         return((*a)->id-(*b)->id);
414         }
415
416 static void load_builtin_compressions(void)
417         {
418         int got_write_lock = 0;
419
420         CRYPTO_r_lock(CRYPTO_LOCK_SSL);
421         if (ssl_comp_methods == NULL)
422                 {
423                 CRYPTO_r_unlock(CRYPTO_LOCK_SSL);
424                 CRYPTO_w_lock(CRYPTO_LOCK_SSL);
425                 got_write_lock = 1;
426                 
427                 if (ssl_comp_methods == NULL)
428                         {
429                         SSL_COMP *comp = NULL;
430
431                         MemCheck_off();
432                         ssl_comp_methods=sk_SSL_COMP_new(sk_comp_cmp);
433                         if (ssl_comp_methods != NULL)
434                                 {
435                                 comp=(SSL_COMP *)OPENSSL_malloc(sizeof(SSL_COMP));
436                                 if (comp != NULL)
437                                         {
438                                         comp->method=COMP_zlib();
439                                         if (comp->method
440                                                 && comp->method->type == NID_undef)
441                                                 OPENSSL_free(comp);
442                                         else
443                                                 {
444                                                 comp->id=SSL_COMP_ZLIB_IDX;
445                                                 comp->name=comp->method->name;
446                                                 sk_SSL_COMP_push(ssl_comp_methods,comp);
447                                                 }
448                                         }
449                                 }
450                         MemCheck_on();
451                         }
452                 }
453         
454         if (got_write_lock)
455                 CRYPTO_w_unlock(CRYPTO_LOCK_SSL);
456         else
457                 CRYPTO_r_unlock(CRYPTO_LOCK_SSL);
458         }
459 #endif
460
461 int ssl_cipher_get_evp(const SSL_SESSION *s, const EVP_CIPHER **enc,
462              const EVP_MD **md, int *mac_pkey_type, int *mac_secret_size,SSL_COMP **comp)
463         {
464         int i;
465         const SSL_CIPHER *c;
466
467         c=s->cipher;
468         if (c == NULL) return(0);
469         if (comp != NULL)
470                 {
471                 SSL_COMP ctmp;
472 #ifndef OPENSSL_NO_COMP
473                 load_builtin_compressions();
474 #endif
475
476                 *comp=NULL;
477                 ctmp.id=s->compress_meth;
478                 if (ssl_comp_methods != NULL)
479                         {
480                         i=sk_SSL_COMP_find(ssl_comp_methods,&ctmp);
481                         if (i >= 0)
482                                 *comp=sk_SSL_COMP_value(ssl_comp_methods,i);
483                         else
484                                 *comp=NULL;
485                         }
486                 }
487
488         if ((enc == NULL) || (md == NULL)) return(0);
489
490         switch (c->algorithm_enc)
491                 {
492         case SSL_DES:
493                 i=SSL_ENC_DES_IDX;
494                 break;
495         case SSL_3DES:
496                 i=SSL_ENC_3DES_IDX;
497                 break;
498         case SSL_RC4:
499                 i=SSL_ENC_RC4_IDX;
500                 break;
501         case SSL_RC2:
502                 i=SSL_ENC_RC2_IDX;
503                 break;
504         case SSL_IDEA:
505                 i=SSL_ENC_IDEA_IDX;
506                 break;
507         case SSL_eNULL:
508                 i=SSL_ENC_NULL_IDX;
509                 break;
510         case SSL_AES128:
511                 i=SSL_ENC_AES128_IDX;
512                 break;
513         case SSL_AES256:
514                 i=SSL_ENC_AES256_IDX;
515                 break;
516         case SSL_CAMELLIA128:
517                 i=SSL_ENC_CAMELLIA128_IDX;
518                 break;
519         case SSL_CAMELLIA256:
520                 i=SSL_ENC_CAMELLIA256_IDX;
521                 break;
522         case SSL_eGOST2814789CNT:
523                 i=SSL_ENC_GOST89_IDX;
524                 break;
525         case SSL_SEED:
526                 i=SSL_ENC_SEED_IDX;
527                 break;
528         default:
529                 i= -1;
530                 break;
531                 }
532
533         if ((i < 0) || (i > SSL_ENC_NUM_IDX))
534                 *enc=NULL;
535         else
536                 {
537                 if (i == SSL_ENC_NULL_IDX)
538                         *enc=EVP_enc_null();
539                 else
540                         *enc=ssl_cipher_methods[i];
541                 }
542
543         switch (c->algorithm_mac)
544                 {
545         case SSL_MD5:
546                 i=SSL_MD_MD5_IDX;
547                 break;
548         case SSL_SHA1:
549                 i=SSL_MD_SHA1_IDX;
550                 break;
551         case SSL_GOST94:
552                 i = SSL_MD_GOST94_IDX;
553                 break;
554         case SSL_GOST89MAC:
555                 i = SSL_MD_GOST89MAC_IDX;
556                 break;
557         default:
558                 i= -1;
559                 break;
560                 }
561         if ((i < 0) || (i > SSL_MD_NUM_IDX))
562         {
563                 *md=NULL; 
564                 if (mac_pkey_type!=NULL) *mac_pkey_type = NID_undef;
565                 if (mac_secret_size!=NULL) *mac_secret_size = 0;
566
567         }
568         else
569         {
570                 *md=ssl_digest_methods[i];
571                 if (mac_pkey_type!=NULL) *mac_pkey_type = ssl_mac_pkey_id[i];
572                 if (mac_secret_size!=NULL) *mac_secret_size = ssl_mac_secret_size[i];
573         }       
574
575         if ((*enc != NULL) && (*md != NULL) && (!mac_pkey_type||*mac_pkey_type != NID_undef))
576                 return(1);
577         else
578                 return(0);
579         }
580
581 int ssl_get_handshake_digest(int idx, long *mask, const EVP_MD **md) 
582 {
583         if (idx <0||idx>=SSL_MD_NUM_IDX) 
584                 {
585                 return 0;
586                 }
587         if (ssl_handshake_digest_flag[idx]==0) return 0;
588         *mask = ssl_handshake_digest_flag[idx];
589         *md = ssl_digest_methods[idx];
590         return 1;
591 }
592
593 #define ITEM_SEP(a) \
594         (((a) == ':') || ((a) == ' ') || ((a) == ';') || ((a) == ','))
595
596 static void ll_append_tail(CIPHER_ORDER **head, CIPHER_ORDER *curr,
597              CIPHER_ORDER **tail)
598         {
599         if (curr == *tail) return;
600         if (curr == *head)
601                 *head=curr->next;
602         if (curr->prev != NULL)
603                 curr->prev->next=curr->next;
604         if (curr->next != NULL)
605                 curr->next->prev=curr->prev;
606         (*tail)->next=curr;
607         curr->prev= *tail;
608         curr->next=NULL;
609         *tail=curr;
610         }
611
612 static void ll_append_head(CIPHER_ORDER **head, CIPHER_ORDER *curr,
613              CIPHER_ORDER **tail)
614         {
615         if (curr == *head) return;
616         if (curr == *tail)
617                 *tail=curr->prev;
618         if (curr->next != NULL)
619                 curr->next->prev=curr->prev;
620         if (curr->prev != NULL)
621                 curr->prev->next=curr->next;
622         (*head)->prev=curr;
623         curr->next= *head;
624         curr->prev=NULL;
625         *head=curr;
626         }
627
628 static void ssl_cipher_get_disabled(unsigned long *mkey, unsigned long *auth, unsigned long *enc, unsigned long *mac, unsigned long *ssl)
629         {
630         *mkey = 0;
631         *auth = 0;
632         *enc = 0;
633         *mac = 0;
634         *ssl = 0;
635
636 #ifdef OPENSSL_NO_RSA
637         *mkey |= SSL_kRSA;
638         *auth |= SSL_aRSA;
639 #endif
640 #ifdef OPENSSL_NO_DSA
641         *auth |= SSL_aDSS;
642 #endif
643         *mkey |= SSL_kDHr|SSL_kDHd; /* no such ciphersuites supported! */
644         *auth |= SSL_aDH;
645 #ifdef OPENSSL_NO_DH
646         *mkey |= SSL_kDHr|SSL_kDHd|SSL_kEDH;
647         *auth |= SSL_aDH;
648 #endif
649 #ifdef OPENSSL_NO_KRB5
650         *mkey |= SSL_kKRB5;
651         *auth |= SSL_aKRB5;
652 #endif
653 #ifdef OPENSSL_NO_ECDSA
654         *auth |= SSL_aECDSA;
655 #endif
656 #ifdef OPENSSL_NO_ECDH
657         *mkey |= SSL_kECDHe|SSL_kECDHr;
658         *auth |= SSL_aECDH;
659 #endif
660 #ifdef OPENSSL_NO_PSK
661         *mkey |= SSL_kPSK;
662         *auth |= SSL_aPSK;
663 #endif
664         /* Check for presence of GOST 34.10 algorithms, and if they
665          * do not present, disable  appropriate auth and key exchange */
666         if (!get_optional_pkey_id("gost94")) {
667                 *auth |= SSL_aGOST94;
668         }
669         if (!get_optional_pkey_id("gost2001")) {
670                 *auth |= SSL_aGOST01;
671         }
672         /* Disable GOST key exchange if no GOST signature algs are available * */
673         if ((*auth & (SSL_aGOST94|SSL_aGOST01)) == (SSL_aGOST94|SSL_aGOST01)) {
674                 *mkey |= SSL_kGOST;
675         }       
676 #ifdef SSL_FORBID_ENULL
677         *enc |= SSL_eNULL;
678 #endif
679                 
680
681
682         *enc |= (ssl_cipher_methods[SSL_ENC_DES_IDX ] == NULL) ? SSL_DES :0;
683         *enc |= (ssl_cipher_methods[SSL_ENC_3DES_IDX] == NULL) ? SSL_3DES:0;
684         *enc |= (ssl_cipher_methods[SSL_ENC_RC4_IDX ] == NULL) ? SSL_RC4 :0;
685         *enc |= (ssl_cipher_methods[SSL_ENC_RC2_IDX ] == NULL) ? SSL_RC2 :0;
686         *enc |= (ssl_cipher_methods[SSL_ENC_IDEA_IDX] == NULL) ? SSL_IDEA:0;
687         *enc |= (ssl_cipher_methods[SSL_ENC_AES128_IDX] == NULL) ? SSL_AES128:0;
688         *enc |= (ssl_cipher_methods[SSL_ENC_AES256_IDX] == NULL) ? SSL_AES256:0;
689         *enc |= (ssl_cipher_methods[SSL_ENC_CAMELLIA128_IDX] == NULL) ? SSL_CAMELLIA128:0;
690         *enc |= (ssl_cipher_methods[SSL_ENC_CAMELLIA256_IDX] == NULL) ? SSL_CAMELLIA256:0;
691         *enc |= (ssl_cipher_methods[SSL_ENC_GOST89_IDX] == NULL) ? SSL_eGOST2814789CNT:0;
692         *enc |= (ssl_cipher_methods[SSL_ENC_SEED_IDX] == NULL) ? SSL_SEED:0;
693
694         *mac |= (ssl_digest_methods[SSL_MD_MD5_IDX ] == NULL) ? SSL_MD5 :0;
695         *mac |= (ssl_digest_methods[SSL_MD_SHA1_IDX] == NULL) ? SSL_SHA1:0;
696         *mac |= (ssl_digest_methods[SSL_MD_GOST94_IDX] == NULL) ? SSL_GOST94:0;
697         *mac |= (ssl_digest_methods[SSL_MD_GOST89MAC_IDX] == NULL || ssl_mac_pkey_id[SSL_MD_GOST89MAC_IDX]==NID_undef)? SSL_GOST89MAC:0;
698
699         }
700
701 static void ssl_cipher_collect_ciphers(const SSL_METHOD *ssl_method,
702                 int num_of_ciphers,
703                 unsigned long disabled_mkey, unsigned long disabled_auth,
704                 unsigned long disabled_enc, unsigned long disabled_mac,
705                 unsigned long disabled_ssl,
706                 CIPHER_ORDER *co_list,
707                 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
708         {
709         int i, co_list_num;
710         const SSL_CIPHER *c;
711
712         /*
713          * We have num_of_ciphers descriptions compiled in, depending on the
714          * method selected (SSLv2 and/or SSLv3, TLSv1 etc).
715          * These will later be sorted in a linked list with at most num
716          * entries.
717          */
718
719         /* Get the initial list of ciphers */
720         co_list_num = 0;        /* actual count of ciphers */
721         for (i = 0; i < num_of_ciphers; i++)
722                 {
723                 c = ssl_method->get_cipher(i);
724                 /* drop those that use any of that is not available */
725                 if ((c != NULL) && c->valid &&
726                     !(c->algorithm_mkey & disabled_mkey) &&
727                     !(c->algorithm_auth & disabled_auth) &&
728                     !(c->algorithm_enc & disabled_enc) &&
729                     !(c->algorithm_mac & disabled_mac) &&
730                     !(c->algorithm_ssl & disabled_ssl))
731                         {
732                         co_list[co_list_num].cipher = c;
733                         co_list[co_list_num].next = NULL;
734                         co_list[co_list_num].prev = NULL;
735                         co_list[co_list_num].active = 0;
736                         co_list_num++;
737 #ifdef KSSL_DEBUG
738                         printf("\t%d: %s %lx %lx %lx\n",i,c->name,c->id,c->algorithm_mkey,c->algorithm_auth);
739 #endif  /* KSSL_DEBUG */
740                         /*
741                         if (!sk_push(ca_list,(char *)c)) goto err;
742                         */
743                         }
744                 }
745
746         /*
747          * Prepare linked list from list entries
748          */     
749         if (co_list_num > 0)
750                 {
751                 co_list[0].prev = NULL;
752
753                 if (co_list_num > 1)
754                         {
755                         co_list[0].next = &co_list[1];
756                         
757                         for (i = 1; i < co_list_num - 1; i++)
758                                 {
759                                 co_list[i].prev = &co_list[i - 1];
760                                 co_list[i].next = &co_list[i + 1];
761                                 }
762
763                         co_list[co_list_num - 1].prev = &co_list[co_list_num - 2];
764                         }
765                 
766                 co_list[co_list_num - 1].next = NULL;
767
768                 *head_p = &co_list[0];
769                 *tail_p = &co_list[co_list_num - 1];
770                 }
771         }
772
773 static void ssl_cipher_collect_aliases(const SSL_CIPHER **ca_list,
774                         int num_of_group_aliases,
775                         unsigned long disabled_mkey, unsigned long disabled_auth,
776                         unsigned long disabled_enc, unsigned long disabled_mac,
777                         unsigned long disabled_ssl,
778                         CIPHER_ORDER *head)
779         {
780         CIPHER_ORDER *ciph_curr;
781         const SSL_CIPHER **ca_curr;
782         int i;
783         unsigned long mask_mkey = ~disabled_mkey;
784         unsigned long mask_auth = ~disabled_auth;
785         unsigned long mask_enc = ~disabled_enc;
786         unsigned long mask_mac = ~disabled_mac;
787         unsigned long mask_ssl = ~disabled_ssl;
788
789         /*
790          * First, add the real ciphers as already collected
791          */
792         ciph_curr = head;
793         ca_curr = ca_list;
794         while (ciph_curr != NULL)
795                 {
796                 *ca_curr = ciph_curr->cipher;
797                 ca_curr++;
798                 ciph_curr = ciph_curr->next;
799                 }
800
801         /*
802          * Now we add the available ones from the cipher_aliases[] table.
803          * They represent either one or more algorithms, some of which
804          * in any affected category must be supported (set in enabled_mask),
805          * or represent a cipher strength value (will be added in any case because algorithms=0).
806          */
807         for (i = 0; i < num_of_group_aliases; i++)
808                 {
809                 unsigned long algorithm_mkey = cipher_aliases[i].algorithm_mkey;
810                 unsigned long algorithm_auth = cipher_aliases[i].algorithm_auth;
811                 unsigned long algorithm_enc = cipher_aliases[i].algorithm_enc;
812                 unsigned long algorithm_mac = cipher_aliases[i].algorithm_mac;
813                 unsigned long algorithm_ssl = cipher_aliases[i].algorithm_ssl;
814
815                 if (algorithm_mkey)
816                         if ((algorithm_mkey & mask_mkey) == 0)
817                                 continue;
818         
819                 if (algorithm_auth)
820                         if ((algorithm_auth & mask_auth) == 0)
821                                 continue;
822                 
823                 if (algorithm_enc)
824                         if ((algorithm_enc & mask_enc) == 0)
825                                 continue;
826                 
827                 if (algorithm_mac)
828                         if ((algorithm_mac & mask_mac) == 0)
829                                 continue;
830                 
831                 if (algorithm_ssl)
832                         if ((algorithm_ssl & mask_ssl) == 0)
833                                 continue;
834                 
835                 *ca_curr = (SSL_CIPHER *)(cipher_aliases + i);
836                 ca_curr++;
837                 }
838
839         *ca_curr = NULL;        /* end of list */
840         }
841
842 static void ssl_cipher_apply_rule(unsigned long cipher_id,
843                 unsigned long alg_mkey, unsigned long alg_auth,
844                 unsigned long alg_enc, unsigned long alg_mac,
845                 unsigned long alg_ssl,
846                 unsigned long algo_strength,
847                 int rule, int strength_bits,
848                 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
849         {
850         CIPHER_ORDER *head, *tail, *curr, *curr2, *last;
851         const SSL_CIPHER *cp;
852         int reverse = 0;
853
854 #ifdef CIPHER_DEBUG
855         printf("Applying rule %d with %08lx/%08lx/%08lx/%08lx/%08lx %08lx (%d)\n",
856                 rule, alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl, algo_strength, strength_bits);
857 #endif
858
859         if (rule == CIPHER_DEL)
860                 reverse = 1; /* needed to maintain sorting between currently deleted ciphers */
861
862         head = *head_p;
863         tail = *tail_p;
864
865         if (reverse)
866                 {
867                 curr = tail;
868                 last = head;
869                 }
870         else
871                 {
872                 curr = head;
873                 last = tail;
874                 }
875
876         curr2 = curr;
877         for (;;)
878                 {
879                 if ((curr == NULL) || (curr == last)) break;
880                 curr = curr2;
881                 curr2 = reverse ? curr->prev : curr->next;
882
883                 cp = curr->cipher;
884
885                 /*
886                  * Selection criteria is either the value of strength_bits
887                  * or the algorithms used.
888                  */
889                 if (strength_bits >= 0)
890                         {
891                         if (strength_bits != cp->strength_bits)
892                                 continue;
893                         }
894                 else
895                         {
896 #ifdef CIPHER_DEBUG
897                         printf("\nName: %s:\nAlgo = %08lx/%08lx/%08lx/%08lx/%08lx Algo_strength = %08lx\n", cp->name, cp->algorithm_mkey, cp->algorithm_auth, cp->algorithm_enc, cp->algorithm_mac, cp->algorithm_ssl, cp->algo_strength);
898 #endif
899
900                         if (alg_mkey && !(alg_mkey & cp->algorithm_mkey))
901                                 continue;
902                         if (alg_auth && !(alg_auth & cp->algorithm_auth))
903                                 continue;
904                         if (alg_enc && !(alg_enc & cp->algorithm_enc))
905                                 continue;
906                         if (alg_mac && !(alg_mac & cp->algorithm_mac))
907                                 continue;
908                         if (alg_ssl && !(alg_ssl & cp->algorithm_ssl))
909                                 continue;
910                         if ((algo_strength & SSL_EXP_MASK) && !(algo_strength & SSL_EXP_MASK & cp->algo_strength))
911                                 continue;
912                         if ((algo_strength & SSL_STRONG_MASK) && !(algo_strength & SSL_STRONG_MASK & cp->algo_strength))
913                                 continue;
914                         }
915
916 #ifdef CIPHER_DEBUG
917                 printf("Action = %d\n", rule);
918 #endif
919
920                 /* add the cipher if it has not been added yet. */
921                 if (rule == CIPHER_ADD)
922                         {
923                         /* reverse == 0 */
924                         if (!curr->active)
925                                 {
926                                 ll_append_tail(&head, curr, &tail);
927                                 curr->active = 1;
928                                 }
929                         }
930                 /* Move the added cipher to this location */
931                 else if (rule == CIPHER_ORD)
932                         {
933                         /* reverse == 0 */
934                         if (curr->active)
935                                 {
936                                 ll_append_tail(&head, curr, &tail);
937                                 }
938                         }
939                 else if (rule == CIPHER_DEL)
940                         {
941                         /* reverse == 1 */
942                         if (curr->active)
943                                 {
944                                 /* most recently deleted ciphersuites get best positions
945                                  * for any future CIPHER_ADD (note that the CIPHER_DEL loop
946                                  * works in reverse to maintain the order) */
947                                 ll_append_head(&head, curr, &tail);
948                                 curr->active = 0;
949                                 }
950                         }
951                 else if (rule == CIPHER_KILL)
952                         {
953                         /* reverse == 0 */
954                         if (head == curr)
955                                 head = curr->next;
956                         else
957                                 curr->prev->next = curr->next;
958                         if (tail == curr)
959                                 tail = curr->prev;
960                         curr->active = 0;
961                         if (curr->next != NULL)
962                                 curr->next->prev = curr->prev;
963                         if (curr->prev != NULL)
964                                 curr->prev->next = curr->next;
965                         curr->next = NULL;
966                         curr->prev = NULL;
967                         }
968                 }
969
970         *head_p = head;
971         *tail_p = tail;
972         }
973
974 static int ssl_cipher_strength_sort(CIPHER_ORDER **head_p,
975                                     CIPHER_ORDER **tail_p)
976         {
977         int max_strength_bits, i, *number_uses;
978         CIPHER_ORDER *curr;
979
980         /*
981          * This routine sorts the ciphers with descending strength. The sorting
982          * must keep the pre-sorted sequence, so we apply the normal sorting
983          * routine as '+' movement to the end of the list.
984          */
985         max_strength_bits = 0;
986         curr = *head_p;
987         while (curr != NULL)
988                 {
989                 if (curr->active &&
990                     (curr->cipher->strength_bits > max_strength_bits))
991                     max_strength_bits = curr->cipher->strength_bits;
992                 curr = curr->next;
993                 }
994
995         number_uses = OPENSSL_malloc((max_strength_bits + 1) * sizeof(int));
996         if (!number_uses)
997                 {
998                 SSLerr(SSL_F_SSL_CIPHER_STRENGTH_SORT,ERR_R_MALLOC_FAILURE);
999                 return(0);
1000                 }
1001         memset(number_uses, 0, (max_strength_bits + 1) * sizeof(int));
1002
1003         /*
1004          * Now find the strength_bits values actually used
1005          */
1006         curr = *head_p;
1007         while (curr != NULL)
1008                 {
1009                 if (curr->active)
1010                         number_uses[curr->cipher->strength_bits]++;
1011                 curr = curr->next;
1012                 }
1013         /*
1014          * Go through the list of used strength_bits values in descending
1015          * order.
1016          */
1017         for (i = max_strength_bits; i >= 0; i--)
1018                 if (number_uses[i] > 0)
1019                         ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_ORD, i, head_p, tail_p);
1020
1021         OPENSSL_free(number_uses);
1022         return(1);
1023         }
1024
1025 static int ssl_cipher_process_rulestr(const char *rule_str,
1026                 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p,
1027                 const SSL_CIPHER **ca_list)
1028         {
1029         unsigned long alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl, algo_strength;
1030         const char *l, *buf;
1031         int j, multi, found, rule, retval, ok, buflen;
1032         unsigned long cipher_id = 0;
1033         char ch;
1034
1035         retval = 1;
1036         l = rule_str;
1037         for (;;)
1038                 {
1039                 ch = *l;
1040
1041                 if (ch == '\0')
1042                         break;          /* done */
1043                 if (ch == '-')
1044                         { rule = CIPHER_DEL; l++; }
1045                 else if (ch == '+')
1046                         { rule = CIPHER_ORD; l++; }
1047                 else if (ch == '!')
1048                         { rule = CIPHER_KILL; l++; }
1049                 else if (ch == '@')
1050                         { rule = CIPHER_SPECIAL; l++; }
1051                 else
1052                         { rule = CIPHER_ADD; }
1053
1054                 if (ITEM_SEP(ch))
1055                         {
1056                         l++;
1057                         continue;
1058                         }
1059
1060                 alg_mkey = 0;
1061                 alg_auth = 0;
1062                 alg_enc = 0;
1063                 alg_mac = 0;
1064                 alg_ssl = 0;
1065                 algo_strength = 0;
1066
1067                 for (;;)
1068                         {
1069                         ch = *l;
1070                         buf = l;
1071                         buflen = 0;
1072 #ifndef CHARSET_EBCDIC
1073                         while ( ((ch >= 'A') && (ch <= 'Z')) ||
1074                                 ((ch >= '0') && (ch <= '9')) ||
1075                                 ((ch >= 'a') && (ch <= 'z')) ||
1076                                  (ch == '-'))
1077 #else
1078                         while ( isalnum(ch) || (ch == '-'))
1079 #endif
1080                                  {
1081                                  ch = *(++l);
1082                                  buflen++;
1083                                  }
1084
1085                         if (buflen == 0)
1086                                 {
1087                                 /*
1088                                  * We hit something we cannot deal with,
1089                                  * it is no command or separator nor
1090                                  * alphanumeric, so we call this an error.
1091                                  */
1092                                 SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR,
1093                                        SSL_R_INVALID_COMMAND);
1094                                 retval = found = 0;
1095                                 l++;
1096                                 break;
1097                                 }
1098
1099                         if (rule == CIPHER_SPECIAL)
1100                                 {
1101                                 found = 0; /* unused -- avoid compiler warning */
1102                                 break;  /* special treatment */
1103                                 }
1104
1105                         /* check for multi-part specification */
1106                         if (ch == '+')
1107                                 {
1108                                 multi=1;
1109                                 l++;
1110                                 }
1111                         else
1112                                 multi=0;
1113
1114                         /*
1115                          * Now search for the cipher alias in the ca_list. Be careful
1116                          * with the strncmp, because the "buflen" limitation
1117                          * will make the rule "ADH:SOME" and the cipher
1118                          * "ADH-MY-CIPHER" look like a match for buflen=3.
1119                          * So additionally check whether the cipher name found
1120                          * has the correct length. We can save a strlen() call:
1121                          * just checking for the '\0' at the right place is
1122                          * sufficient, we have to strncmp() anyway. (We cannot
1123                          * use strcmp(), because buf is not '\0' terminated.)
1124                          */
1125                         j = found = 0;
1126                         cipher_id = 0;
1127                         while (ca_list[j])
1128                                 {
1129                                 if (!strncmp(buf, ca_list[j]->name, buflen) &&
1130                                     (ca_list[j]->name[buflen] == '\0'))
1131                                         {
1132                                         found = 1;
1133                                         break;
1134                                         }
1135                                 else
1136                                         j++;
1137                                 }
1138
1139                         if (!found)
1140                                 break;  /* ignore this entry */
1141
1142                         if (ca_list[j]->algorithm_mkey)
1143                                 {
1144                                 if (alg_mkey)
1145                                         {
1146                                         alg_mkey &= ca_list[j]->algorithm_mkey;
1147                                         if (!alg_mkey) { found = 0; break; }
1148                                         }
1149                                 else
1150                                         alg_mkey = ca_list[j]->algorithm_mkey;
1151                                 }
1152
1153                         if (ca_list[j]->algorithm_auth)
1154                                 {
1155                                 if (alg_auth)
1156                                         {
1157                                         alg_auth &= ca_list[j]->algorithm_auth;
1158                                         if (!alg_auth) { found = 0; break; }
1159                                         }
1160                                 else
1161                                         alg_auth = ca_list[j]->algorithm_auth;
1162                                 }
1163                         
1164                         if (ca_list[j]->algorithm_enc)
1165                                 {
1166                                 if (alg_enc)
1167                                         {
1168                                         alg_enc &= ca_list[j]->algorithm_enc;
1169                                         if (!alg_enc) { found = 0; break; }
1170                                         }
1171                                 else
1172                                         alg_enc = ca_list[j]->algorithm_enc;
1173                                 }
1174                                                 
1175                         if (ca_list[j]->algorithm_mac)
1176                                 {
1177                                 if (alg_mac)
1178                                         {
1179                                         alg_mac &= ca_list[j]->algorithm_mac;
1180                                         if (!alg_mac) { found = 0; break; }
1181                                         }
1182                                 else
1183                                         alg_mac = ca_list[j]->algorithm_mac;
1184                                 }
1185                         
1186                         if (ca_list[j]->algo_strength & SSL_EXP_MASK)
1187                                 {
1188                                 if (algo_strength & SSL_EXP_MASK)
1189                                         {
1190                                         algo_strength &= (ca_list[j]->algo_strength & SSL_EXP_MASK) | ~SSL_EXP_MASK;
1191                                         if (!(algo_strength & SSL_EXP_MASK)) { found = 0; break; }
1192                                         }
1193                                 else
1194                                         algo_strength |= ca_list[j]->algo_strength & SSL_EXP_MASK;
1195                                 }
1196
1197                         if (ca_list[j]->algo_strength & SSL_STRONG_MASK)
1198                                 {
1199                                 if (algo_strength & SSL_STRONG_MASK)
1200                                         {
1201                                         algo_strength &= (ca_list[j]->algo_strength & SSL_STRONG_MASK) | ~SSL_STRONG_MASK;
1202                                         if (!(algo_strength & SSL_STRONG_MASK)) { found = 0; break; }
1203                                         }
1204                                 else
1205                                         algo_strength |= ca_list[j]->algo_strength & SSL_STRONG_MASK;
1206                                 }
1207                         
1208                         if (ca_list[j]->valid)
1209                                 {
1210                                 /* explicit ciphersuite found; its protocol version
1211                                  * does not become part of the search pattern!*/
1212
1213                                 cipher_id = ca_list[j]->id;
1214                                 }
1215                         else
1216                                 {
1217                                 /* not an explicit ciphersuite; only in this case, the
1218                                  * protocol version is considered part of the search pattern */
1219
1220                                 if (ca_list[j]->algorithm_ssl)
1221                                         {
1222                                         if (alg_ssl)
1223                                                 {
1224                                                 alg_ssl &= ca_list[j]->algorithm_ssl;
1225                                                 if (!alg_ssl) { found = 0; break; }
1226                                                 }
1227                                         else
1228                                                 alg_ssl = ca_list[j]->algorithm_ssl;
1229                                         }
1230                                 }
1231                         
1232                         if (!multi) break;
1233                         }
1234
1235                 /*
1236                  * Ok, we have the rule, now apply it
1237                  */
1238                 if (rule == CIPHER_SPECIAL)
1239                         {       /* special command */
1240                         ok = 0;
1241                         if ((buflen == 8) &&
1242                                 !strncmp(buf, "STRENGTH", 8))
1243                                 ok = ssl_cipher_strength_sort(head_p, tail_p);
1244                         else
1245                                 SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR,
1246                                         SSL_R_INVALID_COMMAND);
1247                         if (ok == 0)
1248                                 retval = 0;
1249                         /*
1250                          * We do not support any "multi" options
1251                          * together with "@", so throw away the
1252                          * rest of the command, if any left, until
1253                          * end or ':' is found.
1254                          */
1255                         while ((*l != '\0') && !ITEM_SEP(*l))
1256                                 l++;
1257                         }
1258                 else if (found)
1259                         {
1260                         ssl_cipher_apply_rule(cipher_id,
1261                                 alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl, algo_strength,
1262                                 rule, -1, head_p, tail_p);
1263                         }
1264                 else
1265                         {
1266                         while ((*l != '\0') && !ITEM_SEP(*l))
1267                                 l++;
1268                         }
1269                 if (*l == '\0') break; /* done */
1270                 }
1271
1272         return(retval);
1273         }
1274
1275 STACK_OF(SSL_CIPHER) *ssl_create_cipher_list(const SSL_METHOD *ssl_method,
1276                 STACK_OF(SSL_CIPHER) **cipher_list,
1277                 STACK_OF(SSL_CIPHER) **cipher_list_by_id,
1278                 const char *rule_str)
1279         {
1280         int ok, num_of_ciphers, num_of_alias_max, num_of_group_aliases;
1281         unsigned long disabled_mkey, disabled_auth, disabled_enc, disabled_mac, disabled_ssl;
1282         STACK_OF(SSL_CIPHER) *cipherstack, *tmp_cipher_list;
1283         const char *rule_p;
1284         CIPHER_ORDER *co_list = NULL, *head = NULL, *tail = NULL, *curr;
1285         const SSL_CIPHER **ca_list = NULL;
1286
1287         /*
1288          * Return with error if nothing to do.
1289          */
1290         if (rule_str == NULL || cipher_list == NULL || cipher_list_by_id == NULL)
1291                 return NULL;
1292
1293         /*
1294          * To reduce the work to do we only want to process the compiled
1295          * in algorithms, so we first get the mask of disabled ciphers.
1296          */
1297         ssl_cipher_get_disabled(&disabled_mkey, &disabled_auth, &disabled_enc, &disabled_mac, &disabled_ssl);
1298
1299         /*
1300          * Now we have to collect the available ciphers from the compiled
1301          * in ciphers. We cannot get more than the number compiled in, so
1302          * it is used for allocation.
1303          */
1304         num_of_ciphers = ssl_method->num_ciphers();
1305 #ifdef KSSL_DEBUG
1306         printf("ssl_create_cipher_list() for %d ciphers\n", num_of_ciphers);
1307 #endif    /* KSSL_DEBUG */
1308         co_list = (CIPHER_ORDER *)OPENSSL_malloc(sizeof(CIPHER_ORDER) * num_of_ciphers);
1309         if (co_list == NULL)
1310                 {
1311                 SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE);
1312                 return(NULL);   /* Failure */
1313                 }
1314
1315         ssl_cipher_collect_ciphers(ssl_method, num_of_ciphers,
1316                                    disabled_mkey, disabled_auth, disabled_enc, disabled_mac, disabled_ssl,
1317                                    co_list, &head, &tail);
1318
1319
1320         /* Now arrange all ciphers by preference: */
1321
1322         /* Everything else being equal, prefer ephemeral ECDH over other key exchange mechanisms */
1323         ssl_cipher_apply_rule(0, SSL_kEECDH, 0, 0, 0, 0, 0, CIPHER_ADD, -1, &head, &tail);
1324         ssl_cipher_apply_rule(0, SSL_kEECDH, 0, 0, 0, 0, 0, CIPHER_DEL, -1, &head, &tail);
1325
1326         /* AES is our preferred symmetric cipher */
1327         ssl_cipher_apply_rule(0, 0, 0, SSL_AES, 0, 0, 0, CIPHER_ADD, -1, &head, &tail);
1328
1329         /* Temporarily enable everything else for sorting */
1330         ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_ADD, -1, &head, &tail);
1331
1332         /* Low priority for MD5 */
1333         ssl_cipher_apply_rule(0, 0, 0, 0, SSL_MD5, 0, 0, CIPHER_ORD, -1, &head, &tail);
1334
1335         /* Move anonymous ciphers to the end.  Usually, these will remain disabled.
1336          * (For applications that allow them, they aren't too bad, but we prefer
1337          * authenticated ciphers.) */
1338         ssl_cipher_apply_rule(0, 0, SSL_aNULL, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1339
1340         /* Move ciphers without forward secrecy to the end */
1341         ssl_cipher_apply_rule(0, 0, SSL_aECDH, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1342         /* ssl_cipher_apply_rule(0, 0, SSL_aDH, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail); */
1343         ssl_cipher_apply_rule(0, SSL_kRSA, 0, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1344         ssl_cipher_apply_rule(0, SSL_kPSK, 0,0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1345         ssl_cipher_apply_rule(0, SSL_kKRB5, 0,0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1346
1347         /* RC4 is sort-of broken -- move the the end */
1348         ssl_cipher_apply_rule(0, 0, 0, SSL_RC4, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1349
1350         /* Now sort by symmetric encryption strength.  The above ordering remains
1351          * in force within each class */
1352         if (!ssl_cipher_strength_sort(&head, &tail))
1353                 {
1354                 OPENSSL_free(co_list);
1355                 return NULL;
1356                 }
1357
1358         /* Now disable everything (maintaining the ordering!) */
1359         ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_DEL, -1, &head, &tail);
1360
1361
1362         /*
1363          * We also need cipher aliases for selecting based on the rule_str.
1364          * There might be two types of entries in the rule_str: 1) names
1365          * of ciphers themselves 2) aliases for groups of ciphers.
1366          * For 1) we need the available ciphers and for 2) the cipher
1367          * groups of cipher_aliases added together in one list (otherwise
1368          * we would be happy with just the cipher_aliases table).
1369          */
1370         num_of_group_aliases = sizeof(cipher_aliases) / sizeof(SSL_CIPHER);
1371         num_of_alias_max = num_of_ciphers + num_of_group_aliases + 1;
1372         ca_list = OPENSSL_malloc(sizeof(SSL_CIPHER *) * num_of_alias_max);
1373         if (ca_list == NULL)
1374                 {
1375                 OPENSSL_free(co_list);
1376                 SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE);
1377                 return(NULL);   /* Failure */
1378                 }
1379         ssl_cipher_collect_aliases(ca_list, num_of_group_aliases,
1380                                    disabled_mkey, disabled_auth, disabled_enc,
1381                                    disabled_mac, disabled_ssl, head);
1382
1383         /*
1384          * If the rule_string begins with DEFAULT, apply the default rule
1385          * before using the (possibly available) additional rules.
1386          */
1387         ok = 1;
1388         rule_p = rule_str;
1389         if (strncmp(rule_str,"DEFAULT",7) == 0)
1390                 {
1391                 ok = ssl_cipher_process_rulestr(SSL_DEFAULT_CIPHER_LIST,
1392                         &head, &tail, ca_list);
1393                 rule_p += 7;
1394                 if (*rule_p == ':')
1395                         rule_p++;
1396                 }
1397
1398         if (ok && (strlen(rule_p) > 0))
1399                 ok = ssl_cipher_process_rulestr(rule_p, &head, &tail, ca_list);
1400
1401         OPENSSL_free((void *)ca_list);  /* Not needed anymore */
1402
1403         if (!ok)
1404                 {       /* Rule processing failure */
1405                 OPENSSL_free(co_list);
1406                 return(NULL);
1407                 }
1408         
1409         /*
1410          * Allocate new "cipherstack" for the result, return with error
1411          * if we cannot get one.
1412          */
1413         if ((cipherstack = sk_SSL_CIPHER_new_null()) == NULL)
1414                 {
1415                 OPENSSL_free(co_list);
1416                 return(NULL);
1417                 }
1418
1419         /*
1420          * The cipher selection for the list is done. The ciphers are added
1421          * to the resulting precedence to the STACK_OF(SSL_CIPHER).
1422          */
1423         for (curr = head; curr != NULL; curr = curr->next)
1424                 {
1425                 if (curr->active)
1426                         {
1427                         sk_SSL_CIPHER_push(cipherstack, curr->cipher);
1428 #ifdef CIPHER_DEBUG
1429                         printf("<%s>\n",curr->cipher->name);
1430 #endif
1431                         }
1432                 }
1433         OPENSSL_free(co_list);  /* Not needed any longer */
1434
1435         tmp_cipher_list = sk_SSL_CIPHER_dup(cipherstack);
1436         if (tmp_cipher_list == NULL)
1437                 {
1438                 sk_SSL_CIPHER_free(cipherstack);
1439                 return NULL;
1440                 }
1441         if (*cipher_list != NULL)
1442                 sk_SSL_CIPHER_free(*cipher_list);
1443         *cipher_list = cipherstack;
1444         if (*cipher_list_by_id != NULL)
1445                 sk_SSL_CIPHER_free(*cipher_list_by_id);
1446         *cipher_list_by_id = tmp_cipher_list;
1447         (void)sk_SSL_CIPHER_set_cmp_func(*cipher_list_by_id,ssl_cipher_ptr_id_cmp);
1448
1449         sk_SSL_CIPHER_sort(*cipher_list_by_id);
1450         return(cipherstack);
1451         }
1452
1453 char *SSL_CIPHER_description(const SSL_CIPHER *cipher, char *buf, int len)
1454         {
1455         int is_export,pkl,kl;
1456         const char *ver,*exp_str;
1457         const char *kx,*au,*enc,*mac;
1458         unsigned long alg_mkey,alg_auth,alg_enc,alg_mac,alg_ssl,alg2;
1459 #ifdef KSSL_DEBUG
1460         static const char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s AL=%lx/%lx/%lx/%lx/%lx\n";
1461 #else
1462         static const char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s\n";
1463 #endif /* KSSL_DEBUG */
1464
1465         alg_mkey = cipher->algorithm_mkey;
1466         alg_auth = cipher->algorithm_auth;
1467         alg_enc = cipher->algorithm_enc;
1468         alg_mac = cipher->algorithm_mac;
1469         alg_ssl = cipher->algorithm_ssl;
1470
1471         alg2=cipher->algorithm2;
1472
1473         is_export=SSL_C_IS_EXPORT(cipher);
1474         pkl=SSL_C_EXPORT_PKEYLENGTH(cipher);
1475         kl=SSL_C_EXPORT_KEYLENGTH(cipher);
1476         exp_str=is_export?" export":"";
1477         
1478         if (alg_ssl & SSL_SSLV2)
1479                 ver="SSLv2";
1480         else if (alg_ssl & SSL_SSLV3)
1481                 ver="SSLv3";
1482         else
1483                 ver="unknown";
1484
1485         switch (alg_mkey)
1486                 {
1487         case SSL_kRSA:
1488                 kx=is_export?(pkl == 512 ? "RSA(512)" : "RSA(1024)"):"RSA";
1489                 break;
1490         case SSL_kDHr:
1491                 kx="DH/RSA";
1492                 break;
1493         case SSL_kDHd:
1494                 kx="DH/DSS";
1495                 break;
1496         case SSL_kKRB5:
1497                 kx="KRB5";
1498                 break;
1499         case SSL_kEDH:
1500                 kx=is_export?(pkl == 512 ? "DH(512)" : "DH(1024)"):"DH";
1501                 break;
1502         case SSL_kECDHr:
1503                 kx="ECDH/RSA";
1504                 break;
1505         case SSL_kECDHe:
1506                 kx="ECDH/ECDSA";
1507                 break;
1508         case SSL_kEECDH:
1509                 kx="ECDH";
1510                 break;
1511         case SSL_kPSK:
1512                 kx="PSK";
1513                 break;
1514         default:
1515                 kx="unknown";
1516                 }
1517
1518         switch (alg_auth)
1519                 {
1520         case SSL_aRSA:
1521                 au="RSA";
1522                 break;
1523         case SSL_aDSS:
1524                 au="DSS";
1525                 break;
1526         case SSL_aDH:
1527                 au="DH";
1528                 break;
1529         case SSL_aKRB5:
1530                 au="KRB5";
1531                 break;
1532         case SSL_aECDH:
1533                 au="ECDH";
1534                 break;
1535         case SSL_aNULL:
1536                 au="None";
1537                 break;
1538         case SSL_aECDSA:
1539                 au="ECDSA";
1540                 break;
1541         case SSL_aPSK:
1542                 au="PSK";
1543                 break;
1544         default:
1545                 au="unknown";
1546                 break;
1547                 }
1548
1549         switch (alg_enc)
1550                 {
1551         case SSL_DES:
1552                 enc=(is_export && kl == 5)?"DES(40)":"DES(56)";
1553                 break;
1554         case SSL_3DES:
1555                 enc="3DES(168)";
1556                 break;
1557         case SSL_RC4:
1558                 enc=is_export?(kl == 5 ? "RC4(40)" : "RC4(56)")
1559                   :((alg2&SSL2_CF_8_BYTE_ENC)?"RC4(64)":"RC4(128)");
1560                 break;
1561         case SSL_RC2:
1562                 enc=is_export?(kl == 5 ? "RC2(40)" : "RC2(56)"):"RC2(128)";
1563                 break;
1564         case SSL_IDEA:
1565                 enc="IDEA(128)";
1566                 break;
1567         case SSL_eNULL:
1568                 enc="None";
1569                 break;
1570         case SSL_AES128:
1571                 enc="AES(128)";
1572                 break;
1573         case SSL_AES256:
1574                 enc="AES(256)";
1575                 break;
1576         case SSL_CAMELLIA128:
1577                 enc="Camellia(128)";
1578                 break;
1579         case SSL_CAMELLIA256:
1580                 enc="Camellia(256)";
1581                 break;
1582         case SSL_SEED:
1583                 enc="SEED(128)";
1584                 break;
1585         default:
1586                 enc="unknown";
1587                 break;
1588                 }
1589
1590         switch (alg_mac)
1591                 {
1592         case SSL_MD5:
1593                 mac="MD5";
1594                 break;
1595         case SSL_SHA1:
1596                 mac="SHA1";
1597                 break;
1598         default:
1599                 mac="unknown";
1600                 break;
1601                 }
1602
1603         if (buf == NULL)
1604                 {
1605                 len=128;
1606                 buf=OPENSSL_malloc(len);
1607                 if (buf == NULL) return("OPENSSL_malloc Error");
1608                 }
1609         else if (len < 128)
1610                 return("Buffer too small");
1611
1612 #ifdef KSSL_DEBUG
1613         BIO_snprintf(buf,len,format,cipher->name,ver,kx,au,enc,mac,exp_str,alg_mkey,alg_auth,alg_enc,alg_mac,alg_ssl);
1614 #else
1615         BIO_snprintf(buf,len,format,cipher->name,ver,kx,au,enc,mac,exp_str);
1616 #endif /* KSSL_DEBUG */
1617         return(buf);
1618         }
1619
1620 char *SSL_CIPHER_get_version(const SSL_CIPHER *c)
1621         {
1622         int i;
1623
1624         if (c == NULL) return("(NONE)");
1625         i=(int)(c->id>>24L);
1626         if (i == 3)
1627                 return("TLSv1/SSLv3");
1628         else if (i == 2)
1629                 return("SSLv2");
1630         else
1631                 return("unknown");
1632         }
1633
1634 /* return the actual cipher being used */
1635 const char *SSL_CIPHER_get_name(const SSL_CIPHER *c)
1636         {
1637         if (c != NULL)
1638                 return(c->name);
1639         return("(NONE)");
1640         }
1641
1642 /* number of bits for symmetric cipher */
1643 int SSL_CIPHER_get_bits(const SSL_CIPHER *c, int *alg_bits)
1644         {
1645         int ret=0;
1646
1647         if (c != NULL)
1648                 {
1649                 if (alg_bits != NULL) *alg_bits = c->alg_bits;
1650                 ret = c->strength_bits;
1651                 }
1652         return(ret);
1653         }
1654
1655 SSL_COMP *ssl3_comp_find(STACK_OF(SSL_COMP) *sk, int n)
1656         {
1657         SSL_COMP *ctmp;
1658         int i,nn;
1659
1660         if ((n == 0) || (sk == NULL)) return(NULL);
1661         nn=sk_SSL_COMP_num(sk);
1662         for (i=0; i<nn; i++)
1663                 {
1664                 ctmp=sk_SSL_COMP_value(sk,i);
1665                 if (ctmp->id == n)
1666                         return(ctmp);
1667                 }
1668         return(NULL);
1669         }
1670
1671 #ifdef OPENSSL_NO_COMP
1672 void *SSL_COMP_get_compression_methods(void)
1673         {
1674         return NULL;
1675         }
1676 int SSL_COMP_add_compression_method(int id, void *cm)
1677         {
1678         return 1;
1679         }
1680
1681 const char *SSL_COMP_get_name(const void *comp)
1682         {
1683         return NULL;
1684         }
1685 #else
1686 STACK_OF(SSL_COMP) *SSL_COMP_get_compression_methods(void)
1687         {
1688         load_builtin_compressions();
1689         return(ssl_comp_methods);
1690         }
1691
1692 int SSL_COMP_add_compression_method(int id, COMP_METHOD *cm)
1693         {
1694         SSL_COMP *comp;
1695
1696         if (cm == NULL || cm->type == NID_undef)
1697                 return 1;
1698
1699         /* According to draft-ietf-tls-compression-04.txt, the
1700            compression number ranges should be the following:
1701
1702            0 to 63:    methods defined by the IETF
1703            64 to 192:  external party methods assigned by IANA
1704            193 to 255: reserved for private use */
1705         if (id < 193 || id > 255)
1706                 {
1707                 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,SSL_R_COMPRESSION_ID_NOT_WITHIN_PRIVATE_RANGE);
1708                 return 0;
1709                 }
1710
1711         MemCheck_off();
1712         comp=(SSL_COMP *)OPENSSL_malloc(sizeof(SSL_COMP));
1713         comp->id=id;
1714         comp->method=cm;
1715         load_builtin_compressions();
1716         if (ssl_comp_methods
1717                 && sk_SSL_COMP_find(ssl_comp_methods,comp) >= 0)
1718                 {
1719                 OPENSSL_free(comp);
1720                 MemCheck_on();
1721                 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,SSL_R_DUPLICATE_COMPRESSION_ID);
1722                 return(1);
1723                 }
1724         else if ((ssl_comp_methods == NULL)
1725                 || !sk_SSL_COMP_push(ssl_comp_methods,comp))
1726                 {
1727                 OPENSSL_free(comp);
1728                 MemCheck_on();
1729                 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,ERR_R_MALLOC_FAILURE);
1730                 return(1);
1731                 }
1732         else
1733                 {
1734                 MemCheck_on();
1735                 return(0);
1736                 }
1737         }
1738
1739 const char *SSL_COMP_get_name(const COMP_METHOD *comp)
1740         {
1741         if (comp)
1742                 return comp->name;
1743         return NULL;
1744         }
1745
1746 #endif