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