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