64764342af2ee80301949ee8f6583d94b3de91ae
[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 #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_AES128GCM_IDX   12
166 #define SSL_ENC_AES256GCM_IDX   13
167 #define SSL_ENC_NUM_IDX         14
168
169
170 static const EVP_CIPHER *ssl_cipher_methods[SSL_ENC_NUM_IDX]={
171         NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL
172         };
173
174 #define SSL_COMP_NULL_IDX       0
175 #define SSL_COMP_ZLIB_IDX       1
176 #define SSL_COMP_NUM_IDX        2
177
178 static STACK_OF(SSL_COMP) *ssl_comp_methods=NULL;
179
180 #define SSL_MD_MD5_IDX  0
181 #define SSL_MD_SHA1_IDX 1
182 #define SSL_MD_GOST94_IDX 2
183 #define SSL_MD_GOST89MAC_IDX 3
184 #define SSL_MD_SHA256_IDX 4
185 #define SSL_MD_SHA384_IDX 5
186 /*Constant SSL_MAX_DIGEST equal to size of digests array should be 
187  * defined in the
188  * ssl_locl.h */
189 #define SSL_MD_NUM_IDX  SSL_MAX_DIGEST 
190 static const EVP_MD *ssl_digest_methods[SSL_MD_NUM_IDX]={
191         NULL,NULL,NULL,NULL,NULL,NULL
192         };
193 /* PKEY_TYPE for GOST89MAC is known in advance, but, because
194  * implementation is engine-provided, we'll fill it only if
195  * corresponding EVP_PKEY_METHOD is found 
196  */
197 static int  ssl_mac_pkey_id[SSL_MD_NUM_IDX]={
198         EVP_PKEY_HMAC,EVP_PKEY_HMAC,EVP_PKEY_HMAC,NID_undef,
199         EVP_PKEY_HMAC,EVP_PKEY_HMAC
200         };
201
202 static int ssl_mac_secret_size[SSL_MD_NUM_IDX]={
203         0,0,0,0,0,0
204         };
205
206 static int ssl_handshake_digest_flag[SSL_MD_NUM_IDX]={
207         SSL_HANDSHAKE_MAC_MD5,SSL_HANDSHAKE_MAC_SHA,
208         SSL_HANDSHAKE_MAC_GOST94, 0, SSL_HANDSHAKE_MAC_SHA256,
209         SSL_HANDSHAKE_MAC_SHA384
210         };
211
212 #define CIPHER_ADD      1
213 #define CIPHER_KILL     2
214 #define CIPHER_DEL      3
215 #define CIPHER_ORD      4
216 #define CIPHER_SPECIAL  5
217
218 typedef struct cipher_order_st
219         {
220         const SSL_CIPHER *cipher;
221         int active;
222         int dead;
223         struct cipher_order_st *next,*prev;
224         } CIPHER_ORDER;
225
226 static const SSL_CIPHER cipher_aliases[]={
227         /* "ALL" doesn't include eNULL (must be specifically enabled) */
228         {0,SSL_TXT_ALL,0,     0,0,~SSL_eNULL,0,0,0,0,0,0},
229         /* "COMPLEMENTOFALL" */
230         {0,SSL_TXT_CMPALL,0,  0,0,SSL_eNULL,0,0,0,0,0,0},
231
232         /* "COMPLEMENTOFDEFAULT" (does *not* include ciphersuites not found in ALL!) */
233         {0,SSL_TXT_CMPDEF,0,  SSL_kDHE|SSL_kECDHE,SSL_aNULL,~SSL_eNULL,0,0,0,0,0,0},
234
235         /* key exchange aliases
236          * (some of those using only a single bit here combine
237          * multiple key exchange algs according to the RFCs,
238          * e.g. kDHE combines DHE_DSS and DHE_RSA) */
239         {0,SSL_TXT_kRSA,0,    SSL_kRSA,  0,0,0,0,0,0,0,0},
240
241         {0,SSL_TXT_kDHr,0,    SSL_kDHr,  0,0,0,0,0,0,0,0},
242         {0,SSL_TXT_kDHd,0,    SSL_kDHd,  0,0,0,0,0,0,0,0},
243         {0,SSL_TXT_kDH,0,     SSL_kDHr|SSL_kDHd,0,0,0,0,0,0,0,0},
244         {0,SSL_TXT_kEDH,0,    SSL_kDHE,  0,0,0,0,0,0,0,0},
245         {0,SSL_TXT_kDHE,0,    SSL_kDHE,  0,0,0,0,0,0,0,0},
246         {0,SSL_TXT_DH,0,      SSL_kDHr|SSL_kDHd|SSL_kDHE,0,0,0,0,0,0,0,0},
247
248         {0,SSL_TXT_kKRB5,0,   SSL_kKRB5, 0,0,0,0,0,0,0,0},
249
250         {0,SSL_TXT_kECDHr,0,  SSL_kECDHr,0,0,0,0,0,0,0,0},
251         {0,SSL_TXT_kECDHe,0,  SSL_kECDHe,0,0,0,0,0,0,0,0},
252         {0,SSL_TXT_kECDH,0,   SSL_kECDHr|SSL_kECDHe,0,0,0,0,0,0,0,0},
253         {0,SSL_TXT_kEECDH,0,  SSL_kECDHE,0,0,0,0,0,0,0,0},
254         {0,SSL_TXT_kECDHE,0,  SSL_kECDHE,0,0,0,0,0,0,0,0},
255         {0,SSL_TXT_ECDH,0,    SSL_kECDHr|SSL_kECDHe|SSL_kECDHE,0,0,0,0,0,0,0,0},
256
257         {0,SSL_TXT_kPSK,0,    SSL_kPSK,  0,0,0,0,0,0,0,0},
258         {0,SSL_TXT_kSRP,0,    SSL_kSRP,  0,0,0,0,0,0,0,0},
259         {0,SSL_TXT_kGOST,0, SSL_kGOST,0,0,0,0,0,0,0,0},
260
261         /* server authentication aliases */
262         {0,SSL_TXT_aRSA,0,    0,SSL_aRSA,  0,0,0,0,0,0,0},
263         {0,SSL_TXT_aDSS,0,    0,SSL_aDSS,  0,0,0,0,0,0,0},
264         {0,SSL_TXT_DSS,0,     0,SSL_aDSS,   0,0,0,0,0,0,0},
265         {0,SSL_TXT_aKRB5,0,   0,SSL_aKRB5, 0,0,0,0,0,0,0},
266         {0,SSL_TXT_aNULL,0,   0,SSL_aNULL, 0,0,0,0,0,0,0},
267         {0,SSL_TXT_aDH,0,     0,SSL_aDH,   0,0,0,0,0,0,0}, /* no such ciphersuites supported! */
268         {0,SSL_TXT_aECDH,0,   0,SSL_aECDH, 0,0,0,0,0,0,0},
269         {0,SSL_TXT_aECDSA,0,  0,SSL_aECDSA,0,0,0,0,0,0,0},
270         {0,SSL_TXT_ECDSA,0,   0,SSL_aECDSA, 0,0,0,0,0,0,0},
271         {0,SSL_TXT_aPSK,0,    0,SSL_aPSK,  0,0,0,0,0,0,0},
272         {0,SSL_TXT_aGOST94,0,0,SSL_aGOST94,0,0,0,0,0,0,0},
273         {0,SSL_TXT_aGOST01,0,0,SSL_aGOST01,0,0,0,0,0,0,0},
274         {0,SSL_TXT_aGOST,0,0,SSL_aGOST94|SSL_aGOST01,0,0,0,0,0,0,0},
275
276         /* aliases combining key exchange and server authentication */
277         {0,SSL_TXT_EDH,0,     SSL_kDHE,~SSL_aNULL,0,0,0,0,0,0,0},
278         {0,SSL_TXT_DHE,0,     SSL_kDHE,~SSL_aNULL,0,0,0,0,0,0,0},
279         {0,SSL_TXT_EECDH,0,   SSL_kECDHE,~SSL_aNULL,0,0,0,0,0,0,0},
280         {0,SSL_TXT_ECDHE,0,   SSL_kECDHE,~SSL_aNULL,0,0,0,0,0,0,0},
281         {0,SSL_TXT_NULL,0,    0,0,SSL_eNULL, 0,0,0,0,0,0},
282         {0,SSL_TXT_KRB5,0,    SSL_kKRB5,SSL_aKRB5,0,0,0,0,0,0,0},
283         {0,SSL_TXT_RSA,0,     SSL_kRSA,SSL_aRSA,0,0,0,0,0,0,0},
284         {0,SSL_TXT_ADH,0,     SSL_kDHE,SSL_aNULL,0,0,0,0,0,0,0},
285         {0,SSL_TXT_AECDH,0,   SSL_kECDHE,SSL_aNULL,0,0,0,0,0,0,0},
286         {0,SSL_TXT_PSK,0,     SSL_kPSK,SSL_aPSK,0,0,0,0,0,0,0},
287         {0,SSL_TXT_SRP,0,     SSL_kSRP,0,0,0,0,0,0,0,0},
288
289
290         /* symmetric encryption aliases */
291         {0,SSL_TXT_DES,0,     0,0,SSL_DES,   0,0,0,0,0,0},
292         {0,SSL_TXT_3DES,0,    0,0,SSL_3DES,  0,0,0,0,0,0},
293         {0,SSL_TXT_RC4,0,     0,0,SSL_RC4,   0,0,0,0,0,0},
294         {0,SSL_TXT_RC2,0,     0,0,SSL_RC2,   0,0,0,0,0,0},
295         {0,SSL_TXT_IDEA,0,    0,0,SSL_IDEA,  0,0,0,0,0,0},
296         {0,SSL_TXT_SEED,0,    0,0,SSL_SEED,  0,0,0,0,0,0},
297         {0,SSL_TXT_eNULL,0,   0,0,SSL_eNULL, 0,0,0,0,0,0},
298         {0,SSL_TXT_AES128,0,  0,0,SSL_AES128|SSL_AES128GCM,0,0,0,0,0,0},
299         {0,SSL_TXT_AES256,0,  0,0,SSL_AES256|SSL_AES256GCM,0,0,0,0,0,0},
300         {0,SSL_TXT_AES,0,     0,0,SSL_AES,0,0,0,0,0,0},
301         {0,SSL_TXT_AES_GCM,0, 0,0,SSL_AES128GCM|SSL_AES256GCM,0,0,0,0,0,0},
302         {0,SSL_TXT_CAMELLIA128,0,0,0,SSL_CAMELLIA128,0,0,0,0,0,0},
303         {0,SSL_TXT_CAMELLIA256,0,0,0,SSL_CAMELLIA256,0,0,0,0,0,0},
304         {0,SSL_TXT_CAMELLIA   ,0,0,0,SSL_CAMELLIA128|SSL_CAMELLIA256,0,0,0,0,0,0},
305
306         /* MAC aliases */       
307         {0,SSL_TXT_MD5,0,     0,0,0,SSL_MD5,   0,0,0,0,0},
308         {0,SSL_TXT_SHA1,0,    0,0,0,SSL_SHA1,  0,0,0,0,0},
309         {0,SSL_TXT_SHA,0,     0,0,0,SSL_SHA1,  0,0,0,0,0},
310         {0,SSL_TXT_GOST94,0,     0,0,0,SSL_GOST94,  0,0,0,0,0},
311         {0,SSL_TXT_GOST89MAC,0,     0,0,0,SSL_GOST89MAC,  0,0,0,0,0},
312         {0,SSL_TXT_SHA256,0,    0,0,0,SSL_SHA256,  0,0,0,0,0},
313         {0,SSL_TXT_SHA384,0,    0,0,0,SSL_SHA384,  0,0,0,0,0},
314
315         /* protocol version aliases */
316         {0,SSL_TXT_SSLV2,0,   0,0,0,0,SSL_SSLV2, 0,0,0,0},
317         {0,SSL_TXT_SSLV3,0,   0,0,0,0,SSL_SSLV3, 0,0,0,0},
318         {0,SSL_TXT_TLSV1,0,   0,0,0,0,SSL_TLSV1, 0,0,0,0},
319         {0,SSL_TXT_TLSV1_2,0, 0,0,0,0,SSL_TLSV1_2, 0,0,0,0},
320
321         /* export flag */
322         {0,SSL_TXT_EXP,0,     0,0,0,0,0,SSL_EXPORT,0,0,0},
323         {0,SSL_TXT_EXPORT,0,  0,0,0,0,0,SSL_EXPORT,0,0,0},
324
325         /* strength classes */
326         {0,SSL_TXT_EXP40,0,   0,0,0,0,0,SSL_EXP40, 0,0,0},
327         {0,SSL_TXT_EXP56,0,   0,0,0,0,0,SSL_EXP56, 0,0,0},
328         {0,SSL_TXT_LOW,0,     0,0,0,0,0,SSL_LOW,   0,0,0},
329         {0,SSL_TXT_MEDIUM,0,  0,0,0,0,0,SSL_MEDIUM,0,0,0},
330         {0,SSL_TXT_HIGH,0,    0,0,0,0,0,SSL_HIGH,  0,0,0},
331         /* FIPS 140-2 approved ciphersuite */
332         {0,SSL_TXT_FIPS,0,    0,0,~SSL_eNULL,0,0,SSL_FIPS,  0,0,0},
333         };
334 /* Search for public key algorithm with given name and 
335  * return its pkey_id if it is available. Otherwise return 0
336  */
337 #ifdef OPENSSL_NO_ENGINE
338
339 static int get_optional_pkey_id(const char *pkey_name)
340         {
341         const EVP_PKEY_ASN1_METHOD *ameth;
342         int pkey_id=0;
343         ameth = EVP_PKEY_asn1_find_str(NULL,pkey_name,-1);
344         if (ameth) 
345                 {
346                 EVP_PKEY_asn1_get0_info(&pkey_id, NULL,NULL,NULL,NULL,ameth);
347                 }               
348         return pkey_id;
349         }
350
351 #else
352
353 static int get_optional_pkey_id(const char *pkey_name)
354         {
355         const EVP_PKEY_ASN1_METHOD *ameth;
356         ENGINE *tmpeng = NULL;
357         int pkey_id=0;
358         ameth = EVP_PKEY_asn1_find_str(&tmpeng,pkey_name,-1);
359         if (ameth)
360                 {
361                 EVP_PKEY_asn1_get0_info(&pkey_id, NULL,NULL,NULL,NULL,ameth);
362                 }
363         if (tmpeng) ENGINE_finish(tmpeng);
364         return pkey_id;
365         }
366
367 #endif
368
369 void ssl_load_ciphers(void)
370         {
371         ssl_cipher_methods[SSL_ENC_DES_IDX]= 
372                 EVP_get_cipherbyname(SN_des_cbc);
373         ssl_cipher_methods[SSL_ENC_3DES_IDX]=
374                 EVP_get_cipherbyname(SN_des_ede3_cbc);
375         ssl_cipher_methods[SSL_ENC_RC4_IDX]=
376                 EVP_get_cipherbyname(SN_rc4);
377         ssl_cipher_methods[SSL_ENC_RC2_IDX]= 
378                 EVP_get_cipherbyname(SN_rc2_cbc);
379 #ifndef OPENSSL_NO_IDEA
380         ssl_cipher_methods[SSL_ENC_IDEA_IDX]= 
381                 EVP_get_cipherbyname(SN_idea_cbc);
382 #else
383         ssl_cipher_methods[SSL_ENC_IDEA_IDX]= NULL;
384 #endif
385         ssl_cipher_methods[SSL_ENC_AES128_IDX]=
386           EVP_get_cipherbyname(SN_aes_128_cbc);
387         ssl_cipher_methods[SSL_ENC_AES256_IDX]=
388           EVP_get_cipherbyname(SN_aes_256_cbc);
389         ssl_cipher_methods[SSL_ENC_CAMELLIA128_IDX]=
390           EVP_get_cipherbyname(SN_camellia_128_cbc);
391         ssl_cipher_methods[SSL_ENC_CAMELLIA256_IDX]=
392           EVP_get_cipherbyname(SN_camellia_256_cbc);
393         ssl_cipher_methods[SSL_ENC_GOST89_IDX]=
394           EVP_get_cipherbyname(SN_gost89_cnt);
395         ssl_cipher_methods[SSL_ENC_SEED_IDX]=
396           EVP_get_cipherbyname(SN_seed_cbc);
397
398         ssl_cipher_methods[SSL_ENC_AES128GCM_IDX]=
399           EVP_get_cipherbyname(SN_aes_128_gcm);
400         ssl_cipher_methods[SSL_ENC_AES256GCM_IDX]=
401           EVP_get_cipherbyname(SN_aes_256_gcm);
402
403         ssl_digest_methods[SSL_MD_MD5_IDX]=
404                 EVP_get_digestbyname(SN_md5);
405         ssl_mac_secret_size[SSL_MD_MD5_IDX]=
406                 EVP_MD_size(ssl_digest_methods[SSL_MD_MD5_IDX]);
407         OPENSSL_assert(ssl_mac_secret_size[SSL_MD_MD5_IDX] >= 0);
408         ssl_digest_methods[SSL_MD_SHA1_IDX]=
409                 EVP_get_digestbyname(SN_sha1);
410         ssl_mac_secret_size[SSL_MD_SHA1_IDX]=
411                 EVP_MD_size(ssl_digest_methods[SSL_MD_SHA1_IDX]);
412         OPENSSL_assert(ssl_mac_secret_size[SSL_MD_SHA1_IDX] >= 0);
413         ssl_digest_methods[SSL_MD_GOST94_IDX]=
414                 EVP_get_digestbyname(SN_id_GostR3411_94);
415         if (ssl_digest_methods[SSL_MD_GOST94_IDX])
416                 {       
417                 ssl_mac_secret_size[SSL_MD_GOST94_IDX]=
418                         EVP_MD_size(ssl_digest_methods[SSL_MD_GOST94_IDX]);
419                 OPENSSL_assert(ssl_mac_secret_size[SSL_MD_GOST94_IDX] >= 0);
420                 }
421         ssl_digest_methods[SSL_MD_GOST89MAC_IDX]=
422                 EVP_get_digestbyname(SN_id_Gost28147_89_MAC);
423                 ssl_mac_pkey_id[SSL_MD_GOST89MAC_IDX] = get_optional_pkey_id("gost-mac");
424                 if (ssl_mac_pkey_id[SSL_MD_GOST89MAC_IDX]) {
425                         ssl_mac_secret_size[SSL_MD_GOST89MAC_IDX]=32;
426                 }               
427
428         ssl_digest_methods[SSL_MD_SHA256_IDX]=
429                 EVP_get_digestbyname(SN_sha256);
430         ssl_mac_secret_size[SSL_MD_SHA256_IDX]=
431                 EVP_MD_size(ssl_digest_methods[SSL_MD_SHA256_IDX]);
432         ssl_digest_methods[SSL_MD_SHA384_IDX]=
433                 EVP_get_digestbyname(SN_sha384);
434         ssl_mac_secret_size[SSL_MD_SHA384_IDX]=
435                 EVP_MD_size(ssl_digest_methods[SSL_MD_SHA384_IDX]);
436         }
437 #ifndef OPENSSL_NO_COMP
438
439 static int sk_comp_cmp(const SSL_COMP * const *a,
440                         const SSL_COMP * const *b)
441         {
442         return((*a)->id-(*b)->id);
443         }
444
445 static void load_builtin_compressions(void)
446         {
447         int got_write_lock = 0;
448
449         CRYPTO_r_lock(CRYPTO_LOCK_SSL);
450         if (ssl_comp_methods == NULL)
451                 {
452                 CRYPTO_r_unlock(CRYPTO_LOCK_SSL);
453                 CRYPTO_w_lock(CRYPTO_LOCK_SSL);
454                 got_write_lock = 1;
455                 
456                 if (ssl_comp_methods == NULL)
457                         {
458                         SSL_COMP *comp = NULL;
459
460                         MemCheck_off();
461                         ssl_comp_methods=sk_SSL_COMP_new(sk_comp_cmp);
462                         if (ssl_comp_methods != NULL)
463                                 {
464                                 comp=(SSL_COMP *)OPENSSL_malloc(sizeof(SSL_COMP));
465                                 if (comp != NULL)
466                                         {
467                                         comp->method=COMP_zlib();
468                                         if (comp->method
469                                                 && comp->method->type == NID_undef)
470                                                 OPENSSL_free(comp);
471                                         else
472                                                 {
473                                                 comp->id=SSL_COMP_ZLIB_IDX;
474                                                 comp->name=comp->method->name;
475                                                 sk_SSL_COMP_push(ssl_comp_methods,comp);
476                                                 }
477                                         }
478                                         sk_SSL_COMP_sort(ssl_comp_methods);
479                                 }
480                         MemCheck_on();
481                         }
482                 }
483         
484         if (got_write_lock)
485                 CRYPTO_w_unlock(CRYPTO_LOCK_SSL);
486         else
487                 CRYPTO_r_unlock(CRYPTO_LOCK_SSL);
488         }
489 #endif
490
491 int ssl_cipher_get_evp(const SSL_SESSION *s, const EVP_CIPHER **enc,
492              const EVP_MD **md, int *mac_pkey_type, int *mac_secret_size,SSL_COMP **comp, int use_etm)
493         {
494         int i;
495         const SSL_CIPHER *c;
496
497         c=s->cipher;
498         if (c == NULL) return(0);
499         if (comp != NULL)
500                 {
501                 SSL_COMP ctmp;
502 #ifndef OPENSSL_NO_COMP
503                 load_builtin_compressions();
504 #endif
505
506                 *comp=NULL;
507                 ctmp.id=s->compress_meth;
508                 if (ssl_comp_methods != NULL)
509                         {
510                         i=sk_SSL_COMP_find(ssl_comp_methods,&ctmp);
511                         if (i >= 0)
512                                 *comp=sk_SSL_COMP_value(ssl_comp_methods,i);
513                         else
514                                 *comp=NULL;
515                         }
516                 }
517
518         if ((enc == NULL) || (md == NULL)) return(0);
519
520         switch (c->algorithm_enc)
521                 {
522         case SSL_DES:
523                 i=SSL_ENC_DES_IDX;
524                 break;
525         case SSL_3DES:
526                 i=SSL_ENC_3DES_IDX;
527                 break;
528         case SSL_RC4:
529                 i=SSL_ENC_RC4_IDX;
530                 break;
531         case SSL_RC2:
532                 i=SSL_ENC_RC2_IDX;
533                 break;
534         case SSL_IDEA:
535                 i=SSL_ENC_IDEA_IDX;
536                 break;
537         case SSL_eNULL:
538                 i=SSL_ENC_NULL_IDX;
539                 break;
540         case SSL_AES128:
541                 i=SSL_ENC_AES128_IDX;
542                 break;
543         case SSL_AES256:
544                 i=SSL_ENC_AES256_IDX;
545                 break;
546         case SSL_CAMELLIA128:
547                 i=SSL_ENC_CAMELLIA128_IDX;
548                 break;
549         case SSL_CAMELLIA256:
550                 i=SSL_ENC_CAMELLIA256_IDX;
551                 break;
552         case SSL_eGOST2814789CNT:
553                 i=SSL_ENC_GOST89_IDX;
554                 break;
555         case SSL_SEED:
556                 i=SSL_ENC_SEED_IDX;
557                 break;
558         case SSL_AES128GCM:
559                 i=SSL_ENC_AES128GCM_IDX;
560                 break;
561         case SSL_AES256GCM:
562                 i=SSL_ENC_AES256GCM_IDX;
563                 break;
564         default:
565                 i= -1;
566                 break;
567                 }
568
569         if ((i < 0) || (i > SSL_ENC_NUM_IDX))
570                 *enc=NULL;
571         else
572                 {
573                 if (i == SSL_ENC_NULL_IDX)
574                         *enc=EVP_enc_null();
575                 else
576                         *enc=ssl_cipher_methods[i];
577                 }
578
579         switch (c->algorithm_mac)
580                 {
581         case SSL_MD5:
582                 i=SSL_MD_MD5_IDX;
583                 break;
584         case SSL_SHA1:
585                 i=SSL_MD_SHA1_IDX;
586                 break;
587         case SSL_SHA256:
588                 i=SSL_MD_SHA256_IDX;
589                 break;
590         case SSL_SHA384:
591                 i=SSL_MD_SHA384_IDX;
592                 break;
593         case SSL_GOST94:
594                 i = SSL_MD_GOST94_IDX;
595                 break;
596         case SSL_GOST89MAC:
597                 i = SSL_MD_GOST89MAC_IDX;
598                 break;
599         default:
600                 i= -1;
601                 break;
602                 }
603         if ((i < 0) || (i > SSL_MD_NUM_IDX))
604         {
605                 *md=NULL; 
606                 if (mac_pkey_type!=NULL) *mac_pkey_type = NID_undef;
607                 if (mac_secret_size!=NULL) *mac_secret_size = 0;
608                 if (c->algorithm_mac == SSL_AEAD)
609                         mac_pkey_type = NULL;
610         }
611         else
612         {
613                 *md=ssl_digest_methods[i];
614                 if (mac_pkey_type!=NULL) *mac_pkey_type = ssl_mac_pkey_id[i];
615                 if (mac_secret_size!=NULL) *mac_secret_size = ssl_mac_secret_size[i];
616         }
617
618         if ((*enc != NULL) &&
619             (*md != NULL || (EVP_CIPHER_flags(*enc)&EVP_CIPH_FLAG_AEAD_CIPHER)) &&
620             (!mac_pkey_type||*mac_pkey_type != NID_undef))
621                 {
622                 const EVP_CIPHER *evp;
623
624                 if (use_etm)
625                         return 1;
626
627                 if (s->ssl_version>>8 != TLS1_VERSION_MAJOR ||
628                     s->ssl_version < TLS1_VERSION)
629                         return 1;
630
631 #ifdef OPENSSL_FIPS
632                 if (FIPS_mode())
633                         return 1;
634 #endif
635
636                 if      (c->algorithm_enc == SSL_RC4 &&
637                          c->algorithm_mac == SSL_MD5 &&
638                          (evp=EVP_get_cipherbyname("RC4-HMAC-MD5")))
639                         *enc = evp, *md = NULL;
640                 else if (c->algorithm_enc == SSL_AES128 &&
641                          c->algorithm_mac == SSL_SHA1 &&
642                          (evp=EVP_get_cipherbyname("AES-128-CBC-HMAC-SHA1")))
643                         *enc = evp, *md = NULL;
644                 else if (c->algorithm_enc == SSL_AES256 &&
645                          c->algorithm_mac == SSL_SHA1 &&
646                          (evp=EVP_get_cipherbyname("AES-256-CBC-HMAC-SHA1")))
647                         *enc = evp, *md = NULL;
648                 else if (c->algorithm_enc == SSL_AES128 &&
649                          c->algorithm_mac == SSL_SHA256 &&
650                          (evp=EVP_get_cipherbyname("AES-128-CBC-HMAC-SHA256")))
651                         *enc = evp, *md = NULL;
652                 else if (c->algorithm_enc == SSL_AES256 &&
653                          c->algorithm_mac == SSL_SHA256 &&
654                          (evp=EVP_get_cipherbyname("AES-256-CBC-HMAC-SHA256")))
655                         *enc = evp, *md = NULL;
656                 return(1);
657                 }
658         else
659                 return(0);
660         }
661
662 int ssl_get_handshake_digest(int idx, long *mask, const EVP_MD **md) 
663 {
664         if (idx <0||idx>=SSL_MD_NUM_IDX) 
665                 {
666                 return 0;
667                 }
668         *mask = ssl_handshake_digest_flag[idx];
669         if (*mask)
670                 *md = ssl_digest_methods[idx];
671         else
672                 *md = NULL;
673         return 1;
674 }
675
676 #define ITEM_SEP(a) \
677         (((a) == ':') || ((a) == ' ') || ((a) == ';') || ((a) == ','))
678
679 static void ll_append_tail(CIPHER_ORDER **head, CIPHER_ORDER *curr,
680              CIPHER_ORDER **tail)
681         {
682         if (curr == *tail) return;
683         if (curr == *head)
684                 *head=curr->next;
685         if (curr->prev != NULL)
686                 curr->prev->next=curr->next;
687         if (curr->next != NULL)
688                 curr->next->prev=curr->prev;
689         (*tail)->next=curr;
690         curr->prev= *tail;
691         curr->next=NULL;
692         *tail=curr;
693         }
694
695 static void ll_append_head(CIPHER_ORDER **head, CIPHER_ORDER *curr,
696              CIPHER_ORDER **tail)
697         {
698         if (curr == *head) return;
699         if (curr == *tail)
700                 *tail=curr->prev;
701         if (curr->next != NULL)
702                 curr->next->prev=curr->prev;
703         if (curr->prev != NULL)
704                 curr->prev->next=curr->next;
705         (*head)->prev=curr;
706         curr->next= *head;
707         curr->prev=NULL;
708         *head=curr;
709         }
710
711 static void ssl_cipher_get_disabled(unsigned long *mkey, unsigned long *auth, unsigned long *enc, unsigned long *mac, unsigned long *ssl)
712         {
713         *mkey = 0;
714         *auth = 0;
715         *enc = 0;
716         *mac = 0;
717         *ssl = 0;
718
719 #ifdef OPENSSL_NO_RSA
720         *mkey |= SSL_kRSA;
721         *auth |= SSL_aRSA;
722 #endif
723 #ifdef OPENSSL_NO_DSA
724         *auth |= SSL_aDSS;
725 #endif
726 #ifdef OPENSSL_NO_DH
727         *mkey |= SSL_kDHr|SSL_kDHd|SSL_kDHE;
728         *auth |= SSL_aDH;
729 #endif
730 #ifdef OPENSSL_NO_KRB5
731         *mkey |= SSL_kKRB5;
732         *auth |= SSL_aKRB5;
733 #endif
734 #ifdef OPENSSL_NO_ECDSA
735         *auth |= SSL_aECDSA;
736 #endif
737 #ifdef OPENSSL_NO_ECDH
738         *mkey |= SSL_kECDHe|SSL_kECDHr;
739         *auth |= SSL_aECDH;
740 #endif
741 #ifdef OPENSSL_NO_PSK
742         *mkey |= SSL_kPSK;
743         *auth |= SSL_aPSK;
744 #endif
745 #ifdef OPENSSL_NO_SRP
746         *mkey |= SSL_kSRP;
747 #endif
748         /* Check for presence of GOST 34.10 algorithms, and if they
749          * do not present, disable  appropriate auth and key exchange */
750         if (!get_optional_pkey_id("gost94")) {
751                 *auth |= SSL_aGOST94;
752         }
753         if (!get_optional_pkey_id("gost2001")) {
754                 *auth |= SSL_aGOST01;
755         }
756         /* Disable GOST key exchange if no GOST signature algs are available * */
757         if ((*auth & (SSL_aGOST94|SSL_aGOST01)) == (SSL_aGOST94|SSL_aGOST01)) {
758                 *mkey |= SSL_kGOST;
759         }       
760 #ifdef SSL_FORBID_ENULL
761         *enc |= SSL_eNULL;
762 #endif
763                 
764
765
766         *enc |= (ssl_cipher_methods[SSL_ENC_DES_IDX ] == NULL) ? SSL_DES :0;
767         *enc |= (ssl_cipher_methods[SSL_ENC_3DES_IDX] == NULL) ? SSL_3DES:0;
768         *enc |= (ssl_cipher_methods[SSL_ENC_RC4_IDX ] == NULL) ? SSL_RC4 :0;
769         *enc |= (ssl_cipher_methods[SSL_ENC_RC2_IDX ] == NULL) ? SSL_RC2 :0;
770         *enc |= (ssl_cipher_methods[SSL_ENC_IDEA_IDX] == NULL) ? SSL_IDEA:0;
771         *enc |= (ssl_cipher_methods[SSL_ENC_AES128_IDX] == NULL) ? SSL_AES128:0;
772         *enc |= (ssl_cipher_methods[SSL_ENC_AES256_IDX] == NULL) ? SSL_AES256:0;
773         *enc |= (ssl_cipher_methods[SSL_ENC_AES128GCM_IDX] == NULL) ? SSL_AES128GCM:0;
774         *enc |= (ssl_cipher_methods[SSL_ENC_AES256GCM_IDX] == NULL) ? SSL_AES256GCM:0;
775         *enc |= (ssl_cipher_methods[SSL_ENC_CAMELLIA128_IDX] == NULL) ? SSL_CAMELLIA128:0;
776         *enc |= (ssl_cipher_methods[SSL_ENC_CAMELLIA256_IDX] == NULL) ? SSL_CAMELLIA256:0;
777         *enc |= (ssl_cipher_methods[SSL_ENC_GOST89_IDX] == NULL) ? SSL_eGOST2814789CNT:0;
778         *enc |= (ssl_cipher_methods[SSL_ENC_SEED_IDX] == NULL) ? SSL_SEED:0;
779
780         *mac |= (ssl_digest_methods[SSL_MD_MD5_IDX ] == NULL) ? SSL_MD5 :0;
781         *mac |= (ssl_digest_methods[SSL_MD_SHA1_IDX] == NULL) ? SSL_SHA1:0;
782         *mac |= (ssl_digest_methods[SSL_MD_SHA256_IDX] == NULL) ? SSL_SHA256:0;
783         *mac |= (ssl_digest_methods[SSL_MD_SHA384_IDX] == NULL) ? SSL_SHA384:0;
784         *mac |= (ssl_digest_methods[SSL_MD_GOST94_IDX] == NULL) ? SSL_GOST94:0;
785         *mac |= (ssl_digest_methods[SSL_MD_GOST89MAC_IDX] == NULL || ssl_mac_pkey_id[SSL_MD_GOST89MAC_IDX]==NID_undef)? SSL_GOST89MAC:0;
786
787         }
788
789 static void ssl_cipher_collect_ciphers(const SSL_METHOD *ssl_method,
790                 int num_of_ciphers,
791                 unsigned long disabled_mkey, unsigned long disabled_auth,
792                 unsigned long disabled_enc, unsigned long disabled_mac,
793                 unsigned long disabled_ssl,
794                 CIPHER_ORDER *co_list,
795                 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
796         {
797         int i, co_list_num;
798         const SSL_CIPHER *c;
799
800         /*
801          * We have num_of_ciphers descriptions compiled in, depending on the
802          * method selected (SSLv2 and/or SSLv3, TLSv1 etc).
803          * These will later be sorted in a linked list with at most num
804          * entries.
805          */
806
807         /* Get the initial list of ciphers */
808         co_list_num = 0;        /* actual count of ciphers */
809         for (i = 0; i < num_of_ciphers; i++)
810                 {
811                 c = ssl_method->get_cipher(i);
812                 /* drop those that use any of that is not available */
813                 if ((c != NULL) && c->valid &&
814 #ifdef OPENSSL_FIPS
815                     (!FIPS_mode() || (c->algo_strength & SSL_FIPS)) &&
816 #endif
817                     !(c->algorithm_mkey & disabled_mkey) &&
818                     !(c->algorithm_auth & disabled_auth) &&
819                     !(c->algorithm_enc & disabled_enc) &&
820                     !(c->algorithm_mac & disabled_mac) &&
821                     !(c->algorithm_ssl & disabled_ssl))
822                         {
823                         co_list[co_list_num].cipher = c;
824                         co_list[co_list_num].next = NULL;
825                         co_list[co_list_num].prev = NULL;
826                         co_list[co_list_num].active = 0;
827                         co_list_num++;
828 #ifdef KSSL_DEBUG
829                         printf("\t%d: %s %lx %lx %lx\n",i,c->name,c->id,c->algorithm_mkey,c->algorithm_auth);
830 #endif  /* KSSL_DEBUG */
831                         /*
832                         if (!sk_push(ca_list,(char *)c)) goto err;
833                         */
834                         }
835                 }
836
837         /*
838          * Prepare linked list from list entries
839          */     
840         if (co_list_num > 0)
841                 {
842                 co_list[0].prev = NULL;
843
844                 if (co_list_num > 1)
845                         {
846                         co_list[0].next = &co_list[1];
847                         
848                         for (i = 1; i < co_list_num - 1; i++)
849                                 {
850                                 co_list[i].prev = &co_list[i - 1];
851                                 co_list[i].next = &co_list[i + 1];
852                                 }
853
854                         co_list[co_list_num - 1].prev = &co_list[co_list_num - 2];
855                         }
856                 
857                 co_list[co_list_num - 1].next = NULL;
858
859                 *head_p = &co_list[0];
860                 *tail_p = &co_list[co_list_num - 1];
861                 }
862         }
863
864 static void ssl_cipher_collect_aliases(const SSL_CIPHER **ca_list,
865                         int num_of_group_aliases,
866                         unsigned long disabled_mkey, unsigned long disabled_auth,
867                         unsigned long disabled_enc, unsigned long disabled_mac,
868                         unsigned long disabled_ssl,
869                         CIPHER_ORDER *head)
870         {
871         CIPHER_ORDER *ciph_curr;
872         const SSL_CIPHER **ca_curr;
873         int i;
874         unsigned long mask_mkey = ~disabled_mkey;
875         unsigned long mask_auth = ~disabled_auth;
876         unsigned long mask_enc = ~disabled_enc;
877         unsigned long mask_mac = ~disabled_mac;
878         unsigned long mask_ssl = ~disabled_ssl;
879
880         /*
881          * First, add the real ciphers as already collected
882          */
883         ciph_curr = head;
884         ca_curr = ca_list;
885         while (ciph_curr != NULL)
886                 {
887                 *ca_curr = ciph_curr->cipher;
888                 ca_curr++;
889                 ciph_curr = ciph_curr->next;
890                 }
891
892         /*
893          * Now we add the available ones from the cipher_aliases[] table.
894          * They represent either one or more algorithms, some of which
895          * in any affected category must be supported (set in enabled_mask),
896          * or represent a cipher strength value (will be added in any case because algorithms=0).
897          */
898         for (i = 0; i < num_of_group_aliases; i++)
899                 {
900                 unsigned long algorithm_mkey = cipher_aliases[i].algorithm_mkey;
901                 unsigned long algorithm_auth = cipher_aliases[i].algorithm_auth;
902                 unsigned long algorithm_enc = cipher_aliases[i].algorithm_enc;
903                 unsigned long algorithm_mac = cipher_aliases[i].algorithm_mac;
904                 unsigned long algorithm_ssl = cipher_aliases[i].algorithm_ssl;
905
906                 if (algorithm_mkey)
907                         if ((algorithm_mkey & mask_mkey) == 0)
908                                 continue;
909         
910                 if (algorithm_auth)
911                         if ((algorithm_auth & mask_auth) == 0)
912                                 continue;
913                 
914                 if (algorithm_enc)
915                         if ((algorithm_enc & mask_enc) == 0)
916                                 continue;
917                 
918                 if (algorithm_mac)
919                         if ((algorithm_mac & mask_mac) == 0)
920                                 continue;
921                 
922                 if (algorithm_ssl)
923                         if ((algorithm_ssl & mask_ssl) == 0)
924                                 continue;
925                 
926                 *ca_curr = (SSL_CIPHER *)(cipher_aliases + i);
927                 ca_curr++;
928                 }
929
930         *ca_curr = NULL;        /* end of list */
931         }
932
933 static void ssl_cipher_apply_rule(unsigned long cipher_id,
934                 unsigned long alg_mkey, unsigned long alg_auth,
935                 unsigned long alg_enc, unsigned long alg_mac,
936                 unsigned long alg_ssl,
937                 unsigned long algo_strength,
938                 int rule, int strength_bits,
939                 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
940         {
941         CIPHER_ORDER *head, *tail, *curr, *curr2, *last;
942         const SSL_CIPHER *cp;
943         int reverse = 0;
944
945 #ifdef CIPHER_DEBUG
946         printf("Applying rule %d with %08lx/%08lx/%08lx/%08lx/%08lx %08lx (%d)\n",
947                 rule, alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl, algo_strength, strength_bits);
948 #endif
949
950         if (rule == CIPHER_DEL)
951                 reverse = 1; /* needed to maintain sorting between currently deleted ciphers */
952
953         head = *head_p;
954         tail = *tail_p;
955
956         if (reverse)
957                 {
958                 curr = tail;
959                 last = head;
960                 }
961         else
962                 {
963                 curr = head;
964                 last = tail;
965                 }
966
967         curr2 = curr;
968         for (;;)
969                 {
970                 if ((curr == NULL) || (curr == last)) break;
971                 curr = curr2;
972                 curr2 = reverse ? curr->prev : curr->next;
973
974                 cp = curr->cipher;
975
976                 /*
977                  * Selection criteria is either the value of strength_bits
978                  * or the algorithms used.
979                  */
980                 if (strength_bits >= 0)
981                         {
982                         if (strength_bits != cp->strength_bits)
983                                 continue;
984                         }
985                 else
986                         {
987 #ifdef CIPHER_DEBUG
988                         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);
989 #endif
990 #ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
991                         if (cipher_id && cipher_id != cp->id)
992                                 continue;
993 #endif
994                         if (alg_mkey && !(alg_mkey & cp->algorithm_mkey))
995                                 continue;
996                         if (alg_auth && !(alg_auth & cp->algorithm_auth))
997                                 continue;
998                         if (alg_enc && !(alg_enc & cp->algorithm_enc))
999                                 continue;
1000                         if (alg_mac && !(alg_mac & cp->algorithm_mac))
1001                                 continue;
1002                         if (alg_ssl && !(alg_ssl & cp->algorithm_ssl))
1003                                 continue;
1004                         if ((algo_strength & SSL_EXP_MASK) && !(algo_strength & SSL_EXP_MASK & cp->algo_strength))
1005                                 continue;
1006                         if ((algo_strength & SSL_STRONG_MASK) && !(algo_strength & SSL_STRONG_MASK & cp->algo_strength))
1007                                 continue;
1008                         }
1009
1010 #ifdef CIPHER_DEBUG
1011                 printf("Action = %d\n", rule);
1012 #endif
1013
1014                 /* add the cipher if it has not been added yet. */
1015                 if (rule == CIPHER_ADD)
1016                         {
1017                         /* reverse == 0 */
1018                         if (!curr->active)
1019                                 {
1020                                 ll_append_tail(&head, curr, &tail);
1021                                 curr->active = 1;
1022                                 }
1023                         }
1024                 /* Move the added cipher to this location */
1025                 else if (rule == CIPHER_ORD)
1026                         {
1027                         /* reverse == 0 */
1028                         if (curr->active)
1029                                 {
1030                                 ll_append_tail(&head, curr, &tail);
1031                                 }
1032                         }
1033                 else if (rule == CIPHER_DEL)
1034                         {
1035                         /* reverse == 1 */
1036                         if (curr->active)
1037                                 {
1038                                 /* most recently deleted ciphersuites get best positions
1039                                  * for any future CIPHER_ADD (note that the CIPHER_DEL loop
1040                                  * works in reverse to maintain the order) */
1041                                 ll_append_head(&head, curr, &tail);
1042                                 curr->active = 0;
1043                                 }
1044                         }
1045                 else if (rule == CIPHER_KILL)
1046                         {
1047                         /* reverse == 0 */
1048                         if (head == curr)
1049                                 head = curr->next;
1050                         else
1051                                 curr->prev->next = curr->next;
1052                         if (tail == curr)
1053                                 tail = curr->prev;
1054                         curr->active = 0;
1055                         if (curr->next != NULL)
1056                                 curr->next->prev = curr->prev;
1057                         if (curr->prev != NULL)
1058                                 curr->prev->next = curr->next;
1059                         curr->next = NULL;
1060                         curr->prev = NULL;
1061                         }
1062                 }
1063
1064         *head_p = head;
1065         *tail_p = tail;
1066         }
1067
1068 static int ssl_cipher_strength_sort(CIPHER_ORDER **head_p,
1069                                     CIPHER_ORDER **tail_p)
1070         {
1071         int max_strength_bits, i, *number_uses;
1072         CIPHER_ORDER *curr;
1073
1074         /*
1075          * This routine sorts the ciphers with descending strength. The sorting
1076          * must keep the pre-sorted sequence, so we apply the normal sorting
1077          * routine as '+' movement to the end of the list.
1078          */
1079         max_strength_bits = 0;
1080         curr = *head_p;
1081         while (curr != NULL)
1082                 {
1083                 if (curr->active &&
1084                     (curr->cipher->strength_bits > max_strength_bits))
1085                     max_strength_bits = curr->cipher->strength_bits;
1086                 curr = curr->next;
1087                 }
1088
1089         number_uses = OPENSSL_malloc((max_strength_bits + 1) * sizeof(int));
1090         if (!number_uses)
1091                 {
1092                 SSLerr(SSL_F_SSL_CIPHER_STRENGTH_SORT,ERR_R_MALLOC_FAILURE);
1093                 return(0);
1094                 }
1095         memset(number_uses, 0, (max_strength_bits + 1) * sizeof(int));
1096
1097         /*
1098          * Now find the strength_bits values actually used
1099          */
1100         curr = *head_p;
1101         while (curr != NULL)
1102                 {
1103                 if (curr->active)
1104                         number_uses[curr->cipher->strength_bits]++;
1105                 curr = curr->next;
1106                 }
1107         /*
1108          * Go through the list of used strength_bits values in descending
1109          * order.
1110          */
1111         for (i = max_strength_bits; i >= 0; i--)
1112                 if (number_uses[i] > 0)
1113                         ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_ORD, i, head_p, tail_p);
1114
1115         OPENSSL_free(number_uses);
1116         return(1);
1117         }
1118
1119 static int ssl_cipher_process_rulestr(const char *rule_str,
1120                 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p,
1121                 const SSL_CIPHER **ca_list)
1122         {
1123         unsigned long alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl, algo_strength;
1124         const char *l, *buf;
1125         int j, multi, found, rule, retval, ok, buflen;
1126         unsigned long cipher_id = 0;
1127         char ch;
1128
1129         retval = 1;
1130         l = rule_str;
1131         for (;;)
1132                 {
1133                 ch = *l;
1134
1135                 if (ch == '\0')
1136                         break;          /* done */
1137                 if (ch == '-')
1138                         { rule = CIPHER_DEL; l++; }
1139                 else if (ch == '+')
1140                         { rule = CIPHER_ORD; l++; }
1141                 else if (ch == '!')
1142                         { rule = CIPHER_KILL; l++; }
1143                 else if (ch == '@')
1144                         { rule = CIPHER_SPECIAL; l++; }
1145                 else
1146                         { rule = CIPHER_ADD; }
1147
1148                 if (ITEM_SEP(ch))
1149                         {
1150                         l++;
1151                         continue;
1152                         }
1153
1154                 alg_mkey = 0;
1155                 alg_auth = 0;
1156                 alg_enc = 0;
1157                 alg_mac = 0;
1158                 alg_ssl = 0;
1159                 algo_strength = 0;
1160
1161                 for (;;)
1162                         {
1163                         ch = *l;
1164                         buf = l;
1165                         buflen = 0;
1166 #ifndef CHARSET_EBCDIC
1167                         while ( ((ch >= 'A') && (ch <= 'Z')) ||
1168                                 ((ch >= '0') && (ch <= '9')) ||
1169                                 ((ch >= 'a') && (ch <= 'z')) ||
1170                                  (ch == '-') || (ch == '.'))
1171 #else
1172                         while ( isalnum(ch) || (ch == '-') || (ch == '.'))
1173 #endif
1174                                  {
1175                                  ch = *(++l);
1176                                  buflen++;
1177                                  }
1178
1179                         if (buflen == 0)
1180                                 {
1181                                 /*
1182                                  * We hit something we cannot deal with,
1183                                  * it is no command or separator nor
1184                                  * alphanumeric, so we call this an error.
1185                                  */
1186                                 SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR,
1187                                        SSL_R_INVALID_COMMAND);
1188                                 retval = found = 0;
1189                                 l++;
1190                                 break;
1191                                 }
1192
1193                         if (rule == CIPHER_SPECIAL)
1194                                 {
1195                                 found = 0; /* unused -- avoid compiler warning */
1196                                 break;  /* special treatment */
1197                                 }
1198
1199                         /* check for multi-part specification */
1200                         if (ch == '+')
1201                                 {
1202                                 multi=1;
1203                                 l++;
1204                                 }
1205                         else
1206                                 multi=0;
1207
1208                         /*
1209                          * Now search for the cipher alias in the ca_list. Be careful
1210                          * with the strncmp, because the "buflen" limitation
1211                          * will make the rule "ADH:SOME" and the cipher
1212                          * "ADH-MY-CIPHER" look like a match for buflen=3.
1213                          * So additionally check whether the cipher name found
1214                          * has the correct length. We can save a strlen() call:
1215                          * just checking for the '\0' at the right place is
1216                          * sufficient, we have to strncmp() anyway. (We cannot
1217                          * use strcmp(), because buf is not '\0' terminated.)
1218                          */
1219                         j = found = 0;
1220                         cipher_id = 0;
1221                         while (ca_list[j])
1222                                 {
1223                                 if (!strncmp(buf, ca_list[j]->name, buflen) &&
1224                                     (ca_list[j]->name[buflen] == '\0'))
1225                                         {
1226                                         found = 1;
1227                                         break;
1228                                         }
1229                                 else
1230                                         j++;
1231                                 }
1232
1233                         if (!found)
1234                                 break;  /* ignore this entry */
1235
1236                         if (ca_list[j]->algorithm_mkey)
1237                                 {
1238                                 if (alg_mkey)
1239                                         {
1240                                         alg_mkey &= ca_list[j]->algorithm_mkey;
1241                                         if (!alg_mkey) { found = 0; break; }
1242                                         }
1243                                 else
1244                                         alg_mkey = ca_list[j]->algorithm_mkey;
1245                                 }
1246
1247                         if (ca_list[j]->algorithm_auth)
1248                                 {
1249                                 if (alg_auth)
1250                                         {
1251                                         alg_auth &= ca_list[j]->algorithm_auth;
1252                                         if (!alg_auth) { found = 0; break; }
1253                                         }
1254                                 else
1255                                         alg_auth = ca_list[j]->algorithm_auth;
1256                                 }
1257                         
1258                         if (ca_list[j]->algorithm_enc)
1259                                 {
1260                                 if (alg_enc)
1261                                         {
1262                                         alg_enc &= ca_list[j]->algorithm_enc;
1263                                         if (!alg_enc) { found = 0; break; }
1264                                         }
1265                                 else
1266                                         alg_enc = ca_list[j]->algorithm_enc;
1267                                 }
1268                                                 
1269                         if (ca_list[j]->algorithm_mac)
1270                                 {
1271                                 if (alg_mac)
1272                                         {
1273                                         alg_mac &= ca_list[j]->algorithm_mac;
1274                                         if (!alg_mac) { found = 0; break; }
1275                                         }
1276                                 else
1277                                         alg_mac = ca_list[j]->algorithm_mac;
1278                                 }
1279                         
1280                         if (ca_list[j]->algo_strength & SSL_EXP_MASK)
1281                                 {
1282                                 if (algo_strength & SSL_EXP_MASK)
1283                                         {
1284                                         algo_strength &= (ca_list[j]->algo_strength & SSL_EXP_MASK) | ~SSL_EXP_MASK;
1285                                         if (!(algo_strength & SSL_EXP_MASK)) { found = 0; break; }
1286                                         }
1287                                 else
1288                                         algo_strength |= ca_list[j]->algo_strength & SSL_EXP_MASK;
1289                                 }
1290
1291                         if (ca_list[j]->algo_strength & SSL_STRONG_MASK)
1292                                 {
1293                                 if (algo_strength & SSL_STRONG_MASK)
1294                                         {
1295                                         algo_strength &= (ca_list[j]->algo_strength & SSL_STRONG_MASK) | ~SSL_STRONG_MASK;
1296                                         if (!(algo_strength & SSL_STRONG_MASK)) { found = 0; break; }
1297                                         }
1298                                 else
1299                                         algo_strength |= ca_list[j]->algo_strength & SSL_STRONG_MASK;
1300                                 }
1301                         
1302                         if (ca_list[j]->valid)
1303                                 {
1304                                 /* explicit ciphersuite found; its protocol version
1305                                  * does not become part of the search pattern!*/
1306
1307                                 cipher_id = ca_list[j]->id;
1308                                 }
1309                         else
1310                                 {
1311                                 /* not an explicit ciphersuite; only in this case, the
1312                                  * protocol version is considered part of the search pattern */
1313
1314                                 if (ca_list[j]->algorithm_ssl)
1315                                         {
1316                                         if (alg_ssl)
1317                                                 {
1318                                                 alg_ssl &= ca_list[j]->algorithm_ssl;
1319                                                 if (!alg_ssl) { found = 0; break; }
1320                                                 }
1321                                         else
1322                                                 alg_ssl = ca_list[j]->algorithm_ssl;
1323                                         }
1324                                 }
1325                         
1326                         if (!multi) break;
1327                         }
1328
1329                 /*
1330                  * Ok, we have the rule, now apply it
1331                  */
1332                 if (rule == CIPHER_SPECIAL)
1333                         {       /* special command */
1334                         ok = 0;
1335                         if ((buflen == 8) &&
1336                                 !strncmp(buf, "STRENGTH", 8))
1337                                 ok = ssl_cipher_strength_sort(head_p, tail_p);
1338                         else
1339                                 SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR,
1340                                         SSL_R_INVALID_COMMAND);
1341                         if (ok == 0)
1342                                 retval = 0;
1343                         /*
1344                          * We do not support any "multi" options
1345                          * together with "@", so throw away the
1346                          * rest of the command, if any left, until
1347                          * end or ':' is found.
1348                          */
1349                         while ((*l != '\0') && !ITEM_SEP(*l))
1350                                 l++;
1351                         }
1352                 else if (found)
1353                         {
1354                         ssl_cipher_apply_rule(cipher_id,
1355                                 alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl, algo_strength,
1356                                 rule, -1, head_p, tail_p);
1357                         }
1358                 else
1359                         {
1360                         while ((*l != '\0') && !ITEM_SEP(*l))
1361                                 l++;
1362                         }
1363                 if (*l == '\0') break; /* done */
1364                 }
1365
1366         return(retval);
1367         }
1368 #ifndef OPENSSL_NO_EC
1369 static int check_suiteb_cipher_list(const SSL_METHOD *meth, CERT *c,
1370                                         const char **prule_str)
1371         {
1372         unsigned int suiteb_flags = 0, suiteb_comb2 = 0;
1373         if (!strcmp(*prule_str, "SUITEB128"))
1374                 suiteb_flags = SSL_CERT_FLAG_SUITEB_128_LOS;
1375         else if (!strcmp(*prule_str, "SUITEB128ONLY"))
1376                 suiteb_flags = SSL_CERT_FLAG_SUITEB_128_LOS_ONLY;
1377         else if (!strcmp(*prule_str, "SUITEB128C2"))
1378                 {
1379                 suiteb_comb2 = 1;
1380                 suiteb_flags = SSL_CERT_FLAG_SUITEB_128_LOS;
1381                 }
1382         else if (!strcmp(*prule_str, "SUITEB192"))
1383                 suiteb_flags = SSL_CERT_FLAG_SUITEB_192_LOS;
1384
1385         if (suiteb_flags)
1386                 {
1387                 c->cert_flags &= ~SSL_CERT_FLAG_SUITEB_128_LOS;
1388                 c->cert_flags |= suiteb_flags;
1389                 }
1390         else
1391                 suiteb_flags = c->cert_flags & SSL_CERT_FLAG_SUITEB_128_LOS;
1392
1393         if (!suiteb_flags)
1394                 return 1;
1395         /* Check version: if TLS 1.2 ciphers allowed we can use Suite B */
1396
1397         if (!(meth->ssl3_enc->enc_flags & SSL_ENC_FLAG_TLS1_2_CIPHERS))
1398                 {
1399                 if (meth->ssl3_enc->enc_flags & SSL_ENC_FLAG_DTLS)
1400                         SSLerr(SSL_F_CHECK_SUITEB_CIPHER_LIST,
1401                                 SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
1402                 else
1403                         SSLerr(SSL_F_CHECK_SUITEB_CIPHER_LIST,
1404                                 SSL_R_ONLY_TLS_1_2_ALLOWED_IN_SUITEB_MODE);
1405                 return 0;
1406                 }
1407
1408         switch(suiteb_flags)
1409                 {
1410         case SSL_CERT_FLAG_SUITEB_128_LOS:
1411                 if (suiteb_comb2)
1412                         *prule_str = "ECDHE-ECDSA-AES256-GCM-SHA384";
1413                 else
1414                         *prule_str = "ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384";
1415                 break;
1416         case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY:
1417                 *prule_str = "ECDHE-ECDSA-AES128-GCM-SHA256";
1418                 break;
1419         case SSL_CERT_FLAG_SUITEB_192_LOS:
1420                 *prule_str = "ECDHE-ECDSA-AES256-GCM-SHA384";
1421                 break;
1422                 }
1423         /* Set auto ECDH parameter determination */
1424         c->ecdh_tmp_auto = 1;
1425         return 1;
1426         }
1427 #endif
1428
1429
1430 STACK_OF(SSL_CIPHER) *ssl_create_cipher_list(const SSL_METHOD *ssl_method,
1431                 STACK_OF(SSL_CIPHER) **cipher_list,
1432                 STACK_OF(SSL_CIPHER) **cipher_list_by_id,
1433                 const char *rule_str, CERT *c)
1434         {
1435         int ok, num_of_ciphers, num_of_alias_max, num_of_group_aliases;
1436         unsigned long disabled_mkey, disabled_auth, disabled_enc, disabled_mac, disabled_ssl;
1437         STACK_OF(SSL_CIPHER) *cipherstack, *tmp_cipher_list;
1438         const char *rule_p;
1439         CIPHER_ORDER *co_list = NULL, *head = NULL, *tail = NULL, *curr;
1440         const SSL_CIPHER **ca_list = NULL;
1441
1442         /*
1443          * Return with error if nothing to do.
1444          */
1445         if (rule_str == NULL || cipher_list == NULL || cipher_list_by_id == NULL)
1446                 return NULL;
1447 #ifndef OPENSSL_NO_EC
1448         if (!check_suiteb_cipher_list(ssl_method, c, &rule_str))
1449                 return NULL;
1450 #endif
1451
1452         /*
1453          * To reduce the work to do we only want to process the compiled
1454          * in algorithms, so we first get the mask of disabled ciphers.
1455          */
1456         ssl_cipher_get_disabled(&disabled_mkey, &disabled_auth, &disabled_enc, &disabled_mac, &disabled_ssl);
1457
1458         /*
1459          * Now we have to collect the available ciphers from the compiled
1460          * in ciphers. We cannot get more than the number compiled in, so
1461          * it is used for allocation.
1462          */
1463         num_of_ciphers = ssl_method->num_ciphers();
1464 #ifdef KSSL_DEBUG
1465         printf("ssl_create_cipher_list() for %d ciphers\n", num_of_ciphers);
1466 #endif    /* KSSL_DEBUG */
1467         co_list = (CIPHER_ORDER *)OPENSSL_malloc(sizeof(CIPHER_ORDER) * num_of_ciphers);
1468         if (co_list == NULL)
1469                 {
1470                 SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE);
1471                 return(NULL);   /* Failure */
1472                 }
1473
1474         ssl_cipher_collect_ciphers(ssl_method, num_of_ciphers,
1475                                    disabled_mkey, disabled_auth, disabled_enc, disabled_mac, disabled_ssl,
1476                                    co_list, &head, &tail);
1477
1478
1479         /* Now arrange all ciphers by preference: */
1480
1481         /* Everything else being equal, prefer ephemeral ECDH over other key exchange mechanisms */
1482         ssl_cipher_apply_rule(0, SSL_kECDHE, 0, 0, 0, 0, 0, CIPHER_ADD, -1, &head, &tail);
1483         ssl_cipher_apply_rule(0, SSL_kECDHE, 0, 0, 0, 0, 0, CIPHER_DEL, -1, &head, &tail);
1484
1485         /* AES is our preferred symmetric cipher */
1486         ssl_cipher_apply_rule(0, 0, 0, SSL_AES, 0, 0, 0, CIPHER_ADD, -1, &head, &tail);
1487
1488         /* Temporarily enable everything else for sorting */
1489         ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_ADD, -1, &head, &tail);
1490
1491         /* Low priority for MD5 */
1492         ssl_cipher_apply_rule(0, 0, 0, 0, SSL_MD5, 0, 0, CIPHER_ORD, -1, &head, &tail);
1493
1494         /* Move anonymous ciphers to the end.  Usually, these will remain disabled.
1495          * (For applications that allow them, they aren't too bad, but we prefer
1496          * authenticated ciphers.) */
1497         ssl_cipher_apply_rule(0, 0, SSL_aNULL, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1498
1499         /* Move ciphers without forward secrecy to the end */
1500         ssl_cipher_apply_rule(0, 0, SSL_aECDH, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1501         /* ssl_cipher_apply_rule(0, 0, SSL_aDH, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail); */
1502         ssl_cipher_apply_rule(0, SSL_kRSA, 0, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1503         ssl_cipher_apply_rule(0, SSL_kPSK, 0,0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1504         ssl_cipher_apply_rule(0, SSL_kKRB5, 0,0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1505
1506         /* RC4 is sort-of broken -- move the the end */
1507         ssl_cipher_apply_rule(0, 0, 0, SSL_RC4, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1508
1509         /* Now sort by symmetric encryption strength.  The above ordering remains
1510          * in force within each class */
1511         if (!ssl_cipher_strength_sort(&head, &tail))
1512                 {
1513                 OPENSSL_free(co_list);
1514                 return NULL;
1515                 }
1516
1517         /* Now disable everything (maintaining the ordering!) */
1518         ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_DEL, -1, &head, &tail);
1519
1520
1521         /*
1522          * We also need cipher aliases for selecting based on the rule_str.
1523          * There might be two types of entries in the rule_str: 1) names
1524          * of ciphers themselves 2) aliases for groups of ciphers.
1525          * For 1) we need the available ciphers and for 2) the cipher
1526          * groups of cipher_aliases added together in one list (otherwise
1527          * we would be happy with just the cipher_aliases table).
1528          */
1529         num_of_group_aliases = sizeof(cipher_aliases) / sizeof(SSL_CIPHER);
1530         num_of_alias_max = num_of_ciphers + num_of_group_aliases + 1;
1531         ca_list = OPENSSL_malloc(sizeof(SSL_CIPHER *) * num_of_alias_max);
1532         if (ca_list == NULL)
1533                 {
1534                 OPENSSL_free(co_list);
1535                 SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE);
1536                 return(NULL);   /* Failure */
1537                 }
1538         ssl_cipher_collect_aliases(ca_list, num_of_group_aliases,
1539                                    disabled_mkey, disabled_auth, disabled_enc,
1540                                    disabled_mac, disabled_ssl, head);
1541
1542         /*
1543          * If the rule_string begins with DEFAULT, apply the default rule
1544          * before using the (possibly available) additional rules.
1545          */
1546         ok = 1;
1547         rule_p = rule_str;
1548         if (strncmp(rule_str,"DEFAULT",7) == 0)
1549                 {
1550                 ok = ssl_cipher_process_rulestr(SSL_DEFAULT_CIPHER_LIST,
1551                         &head, &tail, ca_list);
1552                 rule_p += 7;
1553                 if (*rule_p == ':')
1554                         rule_p++;
1555                 }
1556
1557         if (ok && (strlen(rule_p) > 0))
1558                 ok = ssl_cipher_process_rulestr(rule_p, &head, &tail, ca_list);
1559
1560         OPENSSL_free((void *)ca_list);  /* Not needed anymore */
1561
1562         if (!ok)
1563                 {       /* Rule processing failure */
1564                 OPENSSL_free(co_list);
1565                 return(NULL);
1566                 }
1567         
1568         /*
1569          * Allocate new "cipherstack" for the result, return with error
1570          * if we cannot get one.
1571          */
1572         if ((cipherstack = sk_SSL_CIPHER_new_null()) == NULL)
1573                 {
1574                 OPENSSL_free(co_list);
1575                 return(NULL);
1576                 }
1577
1578         /*
1579          * The cipher selection for the list is done. The ciphers are added
1580          * to the resulting precedence to the STACK_OF(SSL_CIPHER).
1581          */
1582         for (curr = head; curr != NULL; curr = curr->next)
1583                 {
1584 #ifdef OPENSSL_FIPS
1585                 if (curr->active && (!FIPS_mode() || curr->cipher->algo_strength & SSL_FIPS))
1586 #else
1587                 if (curr->active)
1588 #endif
1589                         {
1590                         sk_SSL_CIPHER_push(cipherstack, curr->cipher);
1591 #ifdef CIPHER_DEBUG
1592                         printf("<%s>\n",curr->cipher->name);
1593 #endif
1594                         }
1595                 }
1596         OPENSSL_free(co_list);  /* Not needed any longer */
1597
1598         tmp_cipher_list = sk_SSL_CIPHER_dup(cipherstack);
1599         if (tmp_cipher_list == NULL)
1600                 {
1601                 sk_SSL_CIPHER_free(cipherstack);
1602                 return NULL;
1603                 }
1604         if (*cipher_list != NULL)
1605                 sk_SSL_CIPHER_free(*cipher_list);
1606         *cipher_list = cipherstack;
1607         if (*cipher_list_by_id != NULL)
1608                 sk_SSL_CIPHER_free(*cipher_list_by_id);
1609         *cipher_list_by_id = tmp_cipher_list;
1610         (void)sk_SSL_CIPHER_set_cmp_func(*cipher_list_by_id,ssl_cipher_ptr_id_cmp);
1611
1612         sk_SSL_CIPHER_sort(*cipher_list_by_id);
1613         return(cipherstack);
1614         }
1615
1616 char *SSL_CIPHER_description(const SSL_CIPHER *cipher, char *buf, int len)
1617         {
1618         int is_export,pkl,kl;
1619         const char *ver,*exp_str;
1620         const char *kx,*au,*enc,*mac;
1621         unsigned long alg_mkey,alg_auth,alg_enc,alg_mac,alg_ssl,alg2;
1622 #ifdef KSSL_DEBUG
1623         static const char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s AL=%lx/%lx/%lx/%lx/%lx\n";
1624 #else
1625         static const char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s\n";
1626 #endif /* KSSL_DEBUG */
1627
1628         alg_mkey = cipher->algorithm_mkey;
1629         alg_auth = cipher->algorithm_auth;
1630         alg_enc = cipher->algorithm_enc;
1631         alg_mac = cipher->algorithm_mac;
1632         alg_ssl = cipher->algorithm_ssl;
1633
1634         alg2=cipher->algorithm2;
1635
1636         is_export=SSL_C_IS_EXPORT(cipher);
1637         pkl=SSL_C_EXPORT_PKEYLENGTH(cipher);
1638         kl=SSL_C_EXPORT_KEYLENGTH(cipher);
1639         exp_str=is_export?" export":"";
1640         
1641         if (alg_ssl & SSL_SSLV2)
1642                 ver="SSLv2";
1643         else if (alg_ssl & SSL_SSLV3)
1644                 ver="SSLv3";
1645         else if (alg_ssl & SSL_TLSV1_2)
1646                 ver="TLSv1.2";
1647         else
1648                 ver="unknown";
1649
1650         switch (alg_mkey)
1651                 {
1652         case SSL_kRSA:
1653                 kx=is_export?(pkl == 512 ? "RSA(512)" : "RSA(1024)"):"RSA";
1654                 break;
1655         case SSL_kDHr:
1656                 kx="DH/RSA";
1657                 break;
1658         case SSL_kDHd:
1659                 kx="DH/DSS";
1660                 break;
1661         case SSL_kKRB5:
1662                 kx="KRB5";
1663                 break;
1664         case SSL_kDHE:
1665                 kx=is_export?(pkl == 512 ? "DH(512)" : "DH(1024)"):"DH";
1666                 break;
1667         case SSL_kECDHr:
1668                 kx="ECDH/RSA";
1669                 break;
1670         case SSL_kECDHe:
1671                 kx="ECDH/ECDSA";
1672                 break;
1673         case SSL_kECDHE:
1674                 kx="ECDH";
1675                 break;
1676         case SSL_kPSK:
1677                 kx="PSK";
1678                 break;
1679         case SSL_kSRP:
1680                 kx="SRP";
1681                 break;
1682         default:
1683                 kx="unknown";
1684                 }
1685
1686         switch (alg_auth)
1687                 {
1688         case SSL_aRSA:
1689                 au="RSA";
1690                 break;
1691         case SSL_aDSS:
1692                 au="DSS";
1693                 break;
1694         case SSL_aDH:
1695                 au="DH";
1696                 break;
1697         case SSL_aKRB5:
1698                 au="KRB5";
1699                 break;
1700         case SSL_aECDH:
1701                 au="ECDH";
1702                 break;
1703         case SSL_aNULL:
1704                 au="None";
1705                 break;
1706         case SSL_aECDSA:
1707                 au="ECDSA";
1708                 break;
1709         case SSL_aPSK:
1710                 au="PSK";
1711                 break;
1712         default:
1713                 au="unknown";
1714                 break;
1715                 }
1716
1717         switch (alg_enc)
1718                 {
1719         case SSL_DES:
1720                 enc=(is_export && kl == 5)?"DES(40)":"DES(56)";
1721                 break;
1722         case SSL_3DES:
1723                 enc="3DES(168)";
1724                 break;
1725         case SSL_RC4:
1726                 enc=is_export?(kl == 5 ? "RC4(40)" : "RC4(56)")
1727                   :((alg2&SSL2_CF_8_BYTE_ENC)?"RC4(64)":"RC4(128)");
1728                 break;
1729         case SSL_RC2:
1730                 enc=is_export?(kl == 5 ? "RC2(40)" : "RC2(56)"):"RC2(128)";
1731                 break;
1732         case SSL_IDEA:
1733                 enc="IDEA(128)";
1734                 break;
1735         case SSL_eNULL:
1736                 enc="None";
1737                 break;
1738         case SSL_AES128:
1739                 enc="AES(128)";
1740                 break;
1741         case SSL_AES256:
1742                 enc="AES(256)";
1743                 break;
1744         case SSL_AES128GCM:
1745                 enc="AESGCM(128)";
1746                 break;
1747         case SSL_AES256GCM:
1748                 enc="AESGCM(256)";
1749                 break;
1750         case SSL_CAMELLIA128:
1751                 enc="Camellia(128)";
1752                 break;
1753         case SSL_CAMELLIA256:
1754                 enc="Camellia(256)";
1755                 break;
1756         case SSL_SEED:
1757                 enc="SEED(128)";
1758                 break;
1759         default:
1760                 enc="unknown";
1761                 break;
1762                 }
1763
1764         switch (alg_mac)
1765                 {
1766         case SSL_MD5:
1767                 mac="MD5";
1768                 break;
1769         case SSL_SHA1:
1770                 mac="SHA1";
1771                 break;
1772         case SSL_SHA256:
1773                 mac="SHA256";
1774                 break;
1775         case SSL_SHA384:
1776                 mac="SHA384";
1777                 break;
1778         case SSL_AEAD:
1779                 mac="AEAD";
1780                 break;
1781         default:
1782                 mac="unknown";
1783                 break;
1784                 }
1785
1786         if (buf == NULL)
1787                 {
1788                 len=128;
1789                 buf=OPENSSL_malloc(len);
1790                 if (buf == NULL) return("OPENSSL_malloc Error");
1791                 }
1792         else if (len < 128)
1793                 return("Buffer too small");
1794
1795 #ifdef KSSL_DEBUG
1796         BIO_snprintf(buf,len,format,cipher->name,ver,kx,au,enc,mac,exp_str,alg_mkey,alg_auth,alg_enc,alg_mac,alg_ssl);
1797 #else
1798         BIO_snprintf(buf,len,format,cipher->name,ver,kx,au,enc,mac,exp_str);
1799 #endif /* KSSL_DEBUG */
1800         return(buf);
1801         }
1802
1803 char *SSL_CIPHER_get_version(const SSL_CIPHER *c)
1804         {
1805         int i;
1806
1807         if (c == NULL) return("(NONE)");
1808         i=(int)(c->id>>24L);
1809         if (i == 3)
1810                 return("TLSv1/SSLv3");
1811         else if (i == 2)
1812                 return("SSLv2");
1813         else
1814                 return("unknown");
1815         }
1816
1817 /* return the actual cipher being used */
1818 const char *SSL_CIPHER_get_name(const SSL_CIPHER *c)
1819         {
1820         if (c != NULL)
1821                 return(c->name);
1822         return("(NONE)");
1823         }
1824
1825 /* number of bits for symmetric cipher */
1826 int SSL_CIPHER_get_bits(const SSL_CIPHER *c, int *alg_bits)
1827         {
1828         int ret=0;
1829
1830         if (c != NULL)
1831                 {
1832                 if (alg_bits != NULL) *alg_bits = c->alg_bits;
1833                 ret = c->strength_bits;
1834                 }
1835         return(ret);
1836         }
1837
1838 unsigned long SSL_CIPHER_get_id(const SSL_CIPHER *c)
1839         {
1840         return c->id;
1841         }
1842
1843 SSL_COMP *ssl3_comp_find(STACK_OF(SSL_COMP) *sk, int n)
1844         {
1845         SSL_COMP *ctmp;
1846         int i,nn;
1847
1848         if ((n == 0) || (sk == NULL)) return(NULL);
1849         nn=sk_SSL_COMP_num(sk);
1850         for (i=0; i<nn; i++)
1851                 {
1852                 ctmp=sk_SSL_COMP_value(sk,i);
1853                 if (ctmp->id == n)
1854                         return(ctmp);
1855                 }
1856         return(NULL);
1857         }
1858
1859 #ifdef OPENSSL_NO_COMP
1860 void *SSL_COMP_get_compression_methods(void)
1861         {
1862         return NULL;
1863         }
1864 int SSL_COMP_add_compression_method(int id, void *cm)
1865         {
1866         return 1;
1867         }
1868
1869 const char *SSL_COMP_get_name(const void *comp)
1870         {
1871         return NULL;
1872         }
1873 #else
1874 STACK_OF(SSL_COMP) *SSL_COMP_get_compression_methods(void)
1875         {
1876         load_builtin_compressions();
1877         return(ssl_comp_methods);
1878         }
1879
1880 int SSL_COMP_add_compression_method(int id, COMP_METHOD *cm)
1881         {
1882         SSL_COMP *comp;
1883
1884         if (cm == NULL || cm->type == NID_undef)
1885                 return 1;
1886
1887         /* According to draft-ietf-tls-compression-04.txt, the
1888            compression number ranges should be the following:
1889
1890            0 to 63:    methods defined by the IETF
1891            64 to 192:  external party methods assigned by IANA
1892            193 to 255: reserved for private use */
1893         if (id < 193 || id > 255)
1894                 {
1895                 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,SSL_R_COMPRESSION_ID_NOT_WITHIN_PRIVATE_RANGE);
1896                 return 0;
1897                 }
1898
1899         MemCheck_off();
1900         comp=(SSL_COMP *)OPENSSL_malloc(sizeof(SSL_COMP));
1901         comp->id=id;
1902         comp->method=cm;
1903         load_builtin_compressions();
1904         if (ssl_comp_methods
1905                 && sk_SSL_COMP_find(ssl_comp_methods,comp) >= 0)
1906                 {
1907                 OPENSSL_free(comp);
1908                 MemCheck_on();
1909                 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,SSL_R_DUPLICATE_COMPRESSION_ID);
1910                 return(1);
1911                 }
1912         else if ((ssl_comp_methods == NULL)
1913                 || !sk_SSL_COMP_push(ssl_comp_methods,comp))
1914                 {
1915                 OPENSSL_free(comp);
1916                 MemCheck_on();
1917                 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,ERR_R_MALLOC_FAILURE);
1918                 return(1);
1919                 }
1920         else
1921                 {
1922                 MemCheck_on();
1923                 return(0);
1924                 }
1925         }
1926
1927 const char *SSL_COMP_get_name(const COMP_METHOD *comp)
1928         {
1929         if (comp)
1930                 return comp->name;
1931         return NULL;
1932         }
1933 #endif
1934 /* For a cipher return the index corresponding to the certificate type */
1935 int ssl_cipher_get_cert_index(const SSL_CIPHER *c)
1936         {
1937         unsigned long alg_k, alg_a;
1938
1939         alg_k = c->algorithm_mkey;
1940         alg_a = c->algorithm_auth;
1941
1942         if (alg_k & (SSL_kECDHr|SSL_kECDHe))
1943                 {
1944                 /* we don't need to look at SSL_kECDHE
1945                  * since no certificate is needed for
1946                  * anon ECDH and for authenticated
1947                  * ECDHE, the check for the auth
1948                  * algorithm will set i correctly
1949                  * NOTE: For ECDH-RSA, we need an ECC
1950                  * not an RSA cert but for ECDHE-RSA
1951                  * we need an RSA cert. Placing the
1952                  * checks for SSL_kECDH before RSA
1953                  * checks ensures the correct cert is chosen.
1954                  */
1955                 return SSL_PKEY_ECC;
1956                 }
1957         else if (alg_a & SSL_aECDSA)
1958                 return SSL_PKEY_ECC;
1959         else if (alg_k & SSL_kDHr)
1960                 return SSL_PKEY_DH_RSA;
1961         else if (alg_k & SSL_kDHd)
1962                 return SSL_PKEY_DH_DSA;
1963         else if (alg_a & SSL_aDSS)
1964                 return SSL_PKEY_DSA_SIGN;
1965         else if (alg_a & SSL_aRSA)
1966                 return SSL_PKEY_RSA_ENC;
1967         else if (alg_a & SSL_aKRB5)
1968                 /* VRS something else here? */
1969                 return -1;
1970         else if (alg_a & SSL_aGOST94) 
1971                 return SSL_PKEY_GOST94;
1972         else if (alg_a & SSL_aGOST01)
1973                 return SSL_PKEY_GOST01;
1974         return -1;
1975         }
1976
1977 const SSL_CIPHER *ssl_get_cipher_by_char(SSL *ssl, const unsigned char *ptr)
1978         {
1979         const SSL_CIPHER *c;
1980         c = ssl->method->get_cipher_by_char(ptr);
1981         if (c == NULL || c->valid == 0)
1982                 return NULL;
1983         return c;
1984         }
1985
1986 const SSL_CIPHER *SSL_CIPHER_find(SSL *ssl, const unsigned char *ptr)
1987         {
1988         return ssl->method->get_cipher_by_char(ptr);
1989         }