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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#include <stdio.h>
60#include <openssl/objects.h>
61#include <openssl/comp.h>
62#include <openssl/fips.h>
63#include "ssl_locl.h"
64
65#define SSL_ENC_DES_IDX 0
66#define SSL_ENC_3DES_IDX 1
67#define SSL_ENC_RC4_IDX 2
68#define SSL_ENC_RC2_IDX 3
69#define SSL_ENC_IDEA_IDX 4
70#define SSL_ENC_eFZA_IDX 5
71#define SSL_ENC_NULL_IDX 6
72#define SSL_ENC_AES128_IDX 7
73#define SSL_ENC_AES256_IDX 8
74#define SSL_ENC_NUM_IDX 9
75
76static const EVP_CIPHER *ssl_cipher_methods[SSL_ENC_NUM_IDX]={
77 NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL
78 };
79
80static STACK_OF(SSL_COMP) *ssl_comp_methods=NULL;
81
82#define SSL_MD_MD5_IDX 0
83#define SSL_MD_SHA1_IDX 1
84#define SSL_MD_NUM_IDX 2
85static const EVP_MD *ssl_digest_methods[SSL_MD_NUM_IDX]={
86 NULL,NULL,
87 };
88
89#define CIPHER_ADD 1
90#define CIPHER_KILL 2
91#define CIPHER_DEL 3
92#define CIPHER_ORD 4
93#define CIPHER_SPECIAL 5
94
95typedef struct cipher_order_st
96 {
97 SSL_CIPHER *cipher;
98 int active;
99 int dead;
100 struct cipher_order_st *next,*prev;
101 } CIPHER_ORDER;
102
103static const SSL_CIPHER cipher_aliases[]={
104 /* Don't include eNULL unless specifically enabled. */
105 {0,SSL_TXT_ALL, 0,SSL_ALL & ~SSL_eNULL, SSL_ALL ,0,0,0,SSL_ALL,SSL_ALL}, /* must be first */
106 {0,SSL_TXT_CMPALL,0,SSL_eNULL,0,0,0,0,SSL_ENC_MASK,0}, /* COMPLEMENT OF ALL */
107 {0,SSL_TXT_CMPDEF,0,SSL_ADH, 0,0,0,0,SSL_AUTH_MASK,0},
108 {0,SSL_TXT_kKRB5,0,SSL_kKRB5,0,0,0,0,SSL_MKEY_MASK,0}, /* VRS Kerberos5 */
109 {0,SSL_TXT_kRSA,0,SSL_kRSA, 0,0,0,0,SSL_MKEY_MASK,0},
110 {0,SSL_TXT_kDHr,0,SSL_kDHr, 0,0,0,0,SSL_MKEY_MASK,0},
111 {0,SSL_TXT_kDHd,0,SSL_kDHd, 0,0,0,0,SSL_MKEY_MASK,0},
112 {0,SSL_TXT_kEDH,0,SSL_kEDH, 0,0,0,0,SSL_MKEY_MASK,0},
113 {0,SSL_TXT_kFZA,0,SSL_kFZA, 0,0,0,0,SSL_MKEY_MASK,0},
114 {0,SSL_TXT_DH, 0,SSL_DH, 0,0,0,0,SSL_MKEY_MASK,0},
115 {0,SSL_TXT_EDH, 0,SSL_EDH, 0,0,0,0,SSL_MKEY_MASK|SSL_AUTH_MASK,0},
116
117 {0,SSL_TXT_aKRB5,0,SSL_aKRB5,0,0,0,0,SSL_AUTH_MASK,0}, /* VRS Kerberos5 */
118 {0,SSL_TXT_aRSA,0,SSL_aRSA, 0,0,0,0,SSL_AUTH_MASK,0},
119 {0,SSL_TXT_aDSS,0,SSL_aDSS, 0,0,0,0,SSL_AUTH_MASK,0},
120 {0,SSL_TXT_aFZA,0,SSL_aFZA, 0,0,0,0,SSL_AUTH_MASK,0},
121 {0,SSL_TXT_aNULL,0,SSL_aNULL,0,0,0,0,SSL_AUTH_MASK,0},
122 {0,SSL_TXT_aDH, 0,SSL_aDH, 0,0,0,0,SSL_AUTH_MASK,0},
123 {0,SSL_TXT_DSS, 0,SSL_DSS, 0,0,0,0,SSL_AUTH_MASK,0},
124
125 {0,SSL_TXT_DES, 0,SSL_DES, 0,0,0,0,SSL_ENC_MASK,0},
126 {0,SSL_TXT_3DES,0,SSL_3DES, 0,0,0,0,SSL_ENC_MASK,0},
127 {0,SSL_TXT_RC4, 0,SSL_RC4, 0,0,0,0,SSL_ENC_MASK,0},
128 {0,SSL_TXT_RC2, 0,SSL_RC2, 0,0,0,0,SSL_ENC_MASK,0},
129#ifndef OPENSSL_NO_IDEA
130 {0,SSL_TXT_IDEA,0,SSL_IDEA, 0,0,0,0,SSL_ENC_MASK,0},
131#endif
132 {0,SSL_TXT_eNULL,0,SSL_eNULL,0,0,0,0,SSL_ENC_MASK,0},
133 {0,SSL_TXT_eFZA,0,SSL_eFZA, 0,0,0,0,SSL_ENC_MASK,0},
134 {0,SSL_TXT_AES, 0,SSL_AES, 0,0,0,0,SSL_ENC_MASK,0},
135
136 {0,SSL_TXT_MD5, 0,SSL_MD5, 0,0,0,0,SSL_MAC_MASK,0},
137 {0,SSL_TXT_SHA1,0,SSL_SHA1, 0,0,0,0,SSL_MAC_MASK,0},
138 {0,SSL_TXT_SHA, 0,SSL_SHA, 0,0,0,0,SSL_MAC_MASK,0},
139
140 {0,SSL_TXT_NULL,0,SSL_NULL, 0,0,0,0,SSL_ENC_MASK,0},
141 {0,SSL_TXT_KRB5,0,SSL_KRB5, 0,0,0,0,SSL_AUTH_MASK|SSL_MKEY_MASK,0},
142 {0,SSL_TXT_RSA, 0,SSL_RSA, 0,0,0,0,SSL_AUTH_MASK|SSL_MKEY_MASK,0},
143 {0,SSL_TXT_ADH, 0,SSL_ADH, 0,0,0,0,SSL_AUTH_MASK|SSL_MKEY_MASK,0},
144 {0,SSL_TXT_FZA, 0,SSL_FZA, 0,0,0,0,SSL_AUTH_MASK|SSL_MKEY_MASK|SSL_ENC_MASK,0},
145
146 {0,SSL_TXT_SSLV2, 0,SSL_SSLV2, 0,0,0,0,SSL_SSL_MASK,0},
147 {0,SSL_TXT_SSLV3, 0,SSL_SSLV3, 0,0,0,0,SSL_SSL_MASK,0},
148 {0,SSL_TXT_TLSV1, 0,SSL_TLSV1, 0,0,0,0,SSL_SSL_MASK,0},
149
150 {0,SSL_TXT_EXP ,0, 0,SSL_EXPORT, 0,0,0,0,SSL_EXP_MASK},
151 {0,SSL_TXT_EXPORT,0, 0,SSL_EXPORT, 0,0,0,0,SSL_EXP_MASK},
152 {0,SSL_TXT_EXP40, 0, 0, SSL_EXP40, 0,0,0,0,SSL_STRONG_MASK},
153 {0,SSL_TXT_EXP56, 0, 0, SSL_EXP56, 0,0,0,0,SSL_STRONG_MASK},
154 {0,SSL_TXT_LOW, 0, 0, SSL_LOW, 0,0,0,0,SSL_STRONG_MASK},
155 {0,SSL_TXT_MEDIUM,0, 0,SSL_MEDIUM, 0,0,0,0,SSL_STRONG_MASK},
156 {0,SSL_TXT_HIGH, 0, 0, SSL_HIGH, 0,0,0,0,SSL_STRONG_MASK},
157 {0,SSL_TXT_FIPS, 0, 0, SSL_FIPS, 0,0,0,0,SSL_FIPS|SSL_STRONG_NONE},
158 };
159
160static int init_ciphers=1;
161
162static void load_ciphers(void)
163 {
164 ssl_cipher_methods[SSL_ENC_DES_IDX]=
165 EVP_get_cipherbyname(SN_des_cbc);
166 ssl_cipher_methods[SSL_ENC_3DES_IDX]=
167 EVP_get_cipherbyname(SN_des_ede3_cbc);
168 ssl_cipher_methods[SSL_ENC_RC4_IDX]=
169 EVP_get_cipherbyname(SN_rc4);
170 ssl_cipher_methods[SSL_ENC_RC2_IDX]=
171 EVP_get_cipherbyname(SN_rc2_cbc);
172#ifndef OPENSSL_NO_IDEA
173 ssl_cipher_methods[SSL_ENC_IDEA_IDX]=
174 EVP_get_cipherbyname(SN_idea_cbc);
175#else
176 ssl_cipher_methods[SSL_ENC_IDEA_IDX]= NULL;
177#endif
178 ssl_cipher_methods[SSL_ENC_AES128_IDX]=
179 EVP_get_cipherbyname(SN_aes_128_cbc);
180 ssl_cipher_methods[SSL_ENC_AES256_IDX]=
181 EVP_get_cipherbyname(SN_aes_256_cbc);
182
183 ssl_digest_methods[SSL_MD_MD5_IDX]=
184 EVP_get_digestbyname(SN_md5);
185 ssl_digest_methods[SSL_MD_SHA1_IDX]=
186 EVP_get_digestbyname(SN_sha1);
187 init_ciphers=0;
188 }
189
190int ssl_cipher_get_evp(const SSL_SESSION *s, const EVP_CIPHER **enc,
191 const EVP_MD **md, SSL_COMP **comp)
192 {
193 int i;
194 SSL_CIPHER *c;
195
196 c=s->cipher;
197 if (c == NULL) return(0);
198 if (comp != NULL)
199 {
200 SSL_COMP ctmp;
201
202 if (s->compress_meth == 0)
203 *comp=NULL;
204 else if (ssl_comp_methods == NULL)
205 {
206 /* bad */
207 *comp=NULL;
208 }
209 else
210 {
211
212 ctmp.id=s->compress_meth;
213 i=sk_SSL_COMP_find(ssl_comp_methods,&ctmp);
214 if (i >= 0)
215 *comp=sk_SSL_COMP_value(ssl_comp_methods,i);
216 else
217 *comp=NULL;
218 }
219 }
220
221 if ((enc == NULL) || (md == NULL)) return(0);
222
223 switch (c->algorithms & SSL_ENC_MASK)
224 {
225 case SSL_DES:
226 i=SSL_ENC_DES_IDX;
227 break;
228 case SSL_3DES:
229 i=SSL_ENC_3DES_IDX;
230 break;
231 case SSL_RC4:
232 i=SSL_ENC_RC4_IDX;
233 break;
234 case SSL_RC2:
235 i=SSL_ENC_RC2_IDX;
236 break;
237 case SSL_IDEA:
238 i=SSL_ENC_IDEA_IDX;
239 break;
240 case SSL_eNULL:
241 i=SSL_ENC_NULL_IDX;
242 break;
243 case SSL_AES:
244 switch(c->alg_bits)
245 {
246 case 128: i=SSL_ENC_AES128_IDX; break;
247 case 256: i=SSL_ENC_AES256_IDX; break;
248 default: i=-1; break;
249 }
250 break;
251 default:
252 i= -1;
253 break;
254 }
255
256 if ((i < 0) || (i >= SSL_ENC_NUM_IDX))
257 *enc=NULL;
258 else
259 {
260 if (i == SSL_ENC_NULL_IDX)
261 *enc=EVP_enc_null();
262 else
263 *enc=ssl_cipher_methods[i];
264 }
265
266 switch (c->algorithms & SSL_MAC_MASK)
267 {
268 case SSL_MD5:
269 i=SSL_MD_MD5_IDX;
270 break;
271 case SSL_SHA1:
272 i=SSL_MD_SHA1_IDX;
273 break;
274 default:
275 i= -1;
276 break;
277 }
278 if ((i < 0) || (i >= SSL_MD_NUM_IDX))
279 *md=NULL;
280 else
281 *md=ssl_digest_methods[i];
282
283 if ((*enc != NULL) && (*md != NULL))
284 return(1);
285 else
286 return(0);
287 }
288
289#define ITEM_SEP(a) \
290 (((a) == ':') || ((a) == ' ') || ((a) == ';') || ((a) == ','))
291
292static void ll_append_tail(CIPHER_ORDER **head, CIPHER_ORDER *curr,
293 CIPHER_ORDER **tail)
294 {
295 if (curr == *tail) return;
296 if (curr == *head)
297 *head=curr->next;
298 if (curr->prev != NULL)
299 curr->prev->next=curr->next;
300 if (curr->next != NULL) /* should always be true */
301 curr->next->prev=curr->prev;
302 (*tail)->next=curr;
303 curr->prev= *tail;
304 curr->next=NULL;
305 *tail=curr;
306 }
307
308static unsigned long ssl_cipher_get_disabled(void)
309 {
310 unsigned long mask;
311
312 mask = SSL_kFZA;
313#ifdef OPENSSL_NO_RSA
314 mask |= SSL_aRSA|SSL_kRSA;
315#endif
316#ifdef OPENSSL_NO_DSA
317 mask |= SSL_aDSS;
318#endif
319#ifdef OPENSSL_NO_DH
320 mask |= SSL_kDHr|SSL_kDHd|SSL_kEDH|SSL_aDH;
321#endif
322#ifdef OPENSSL_NO_KRB5
323 mask |= SSL_kKRB5|SSL_aKRB5;
324#endif
325
326#ifdef SSL_FORBID_ENULL
327 mask |= SSL_eNULL;
328#endif
329
330 mask |= (ssl_cipher_methods[SSL_ENC_DES_IDX ] == NULL) ? SSL_DES :0;
331 mask |= (ssl_cipher_methods[SSL_ENC_3DES_IDX] == NULL) ? SSL_3DES:0;
332 mask |= (ssl_cipher_methods[SSL_ENC_RC4_IDX ] == NULL) ? SSL_RC4 :0;
333 mask |= (ssl_cipher_methods[SSL_ENC_RC2_IDX ] == NULL) ? SSL_RC2 :0;
334 mask |= (ssl_cipher_methods[SSL_ENC_IDEA_IDX] == NULL) ? SSL_IDEA:0;
335 mask |= (ssl_cipher_methods[SSL_ENC_eFZA_IDX] == NULL) ? SSL_eFZA:0;
336 mask |= (ssl_cipher_methods[SSL_ENC_AES128_IDX] == NULL) ? SSL_AES:0;
337
338 mask |= (ssl_digest_methods[SSL_MD_MD5_IDX ] == NULL) ? SSL_MD5 :0;
339 mask |= (ssl_digest_methods[SSL_MD_SHA1_IDX] == NULL) ? SSL_SHA1:0;
340
341 return(mask);
342 }
343
344static void ssl_cipher_collect_ciphers(const SSL_METHOD *ssl_method,
345 int num_of_ciphers, unsigned long mask, CIPHER_ORDER *co_list,
346 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
347 {
348 int i, co_list_num;
349 SSL_CIPHER *c;
350
351 /*
352 * We have num_of_ciphers descriptions compiled in, depending on the
353 * method selected (SSLv2 and/or SSLv3, TLSv1 etc).
354 * These will later be sorted in a linked list with at most num
355 * entries.
356 */
357
358 /* Get the initial list of ciphers */
359 co_list_num = 0; /* actual count of ciphers */
360 for (i = 0; i < num_of_ciphers; i++)
361 {
362 c = ssl_method->get_cipher(i);
363 /* drop those that use any of that is not available */
364#ifdef OPENSSL_FIPS
365 if ((c != NULL) && c->valid && !(c->algorithms & mask)
366 && (!FIPS_mode() || (c->algo_strength & SSL_FIPS)))
367#else
368 if ((c != NULL) && c->valid && !(c->algorithms & mask))
369#endif
370 {
371 co_list[co_list_num].cipher = c;
372 co_list[co_list_num].next = NULL;
373 co_list[co_list_num].prev = NULL;
374 co_list[co_list_num].active = 0;
375 co_list_num++;
376#ifdef KSSL_DEBUG
377 printf("\t%d: %s %lx %lx\n",i,c->name,c->id,c->algorithms);
378#endif /* KSSL_DEBUG */
379 /*
380 if (!sk_push(ca_list,(char *)c)) goto err;
381 */
382 }
383 }
384
385 /*
386 * Prepare linked list from list entries
387 */
388 for (i = 1; i < co_list_num - 1; i++)
389 {
390 co_list[i].prev = &(co_list[i-1]);
391 co_list[i].next = &(co_list[i+1]);
392 }
393 if (co_list_num > 0)
394 {
395 (*head_p) = &(co_list[0]);
396 (*head_p)->prev = NULL;
397 (*head_p)->next = &(co_list[1]);
398 (*tail_p) = &(co_list[co_list_num - 1]);
399 (*tail_p)->prev = &(co_list[co_list_num - 2]);
400 (*tail_p)->next = NULL;
401 }
402 }
403
404static void ssl_cipher_collect_aliases(SSL_CIPHER **ca_list,
405 int num_of_group_aliases, unsigned long mask,
406 CIPHER_ORDER *head)
407 {
408 CIPHER_ORDER *ciph_curr;
409 SSL_CIPHER **ca_curr;
410 int i;
411
412 /*
413 * First, add the real ciphers as already collected
414 */
415 ciph_curr = head;
416 ca_curr = ca_list;
417 while (ciph_curr != NULL)
418 {
419 *ca_curr = ciph_curr->cipher;
420 ca_curr++;
421 ciph_curr = ciph_curr->next;
422 }
423
424 /*
425 * Now we add the available ones from the cipher_aliases[] table.
426 * They represent either an algorithm, that must be fully
427 * supported (not match any bit in mask) or represent a cipher
428 * strength value (will be added in any case because algorithms=0).
429 */
430 for (i = 0; i < num_of_group_aliases; i++)
431 {
432 if ((i == 0) || /* always fetch "ALL" */
433 !(cipher_aliases[i].algorithms & mask))
434 {
435 *ca_curr = (SSL_CIPHER *)(cipher_aliases + i);
436 ca_curr++;
437 }
438 }
439
440 *ca_curr = NULL; /* end of list */
441 }
442
443static void ssl_cipher_apply_rule(unsigned long algorithms, unsigned long mask,
444 unsigned long algo_strength, unsigned long mask_strength,
445 int rule, int strength_bits, CIPHER_ORDER *co_list,
446 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
447 {
448 CIPHER_ORDER *head, *tail, *curr, *curr2, *tail2;
449 SSL_CIPHER *cp;
450 unsigned long ma, ma_s;
451
452#ifdef CIPHER_DEBUG
453 printf("Applying rule %d with %08lx %08lx %08lx %08lx (%d)\n",
454 rule, algorithms, mask, algo_strength, mask_strength,
455 strength_bits);
456#endif
457
458 curr = head = *head_p;
459 curr2 = head;
460 tail2 = tail = *tail_p;
461 for (;;)
462 {
463 if ((curr == NULL) || (curr == tail2)) break;
464 curr = curr2;
465 curr2 = curr->next;
466
467 cp = curr->cipher;
468
469 /*
470 * Selection criteria is either the number of strength_bits
471 * or the algorithm used.
472 */
473 if (strength_bits == -1)
474 {
475 ma = mask & cp->algorithms;
476 ma_s = mask_strength & cp->algo_strength;
477
478#ifdef CIPHER_DEBUG
479 printf("\nName: %s:\nAlgo = %08lx Algo_strength = %08lx\nMask = %08lx Mask_strength %08lx\n", cp->name, cp->algorithms, cp->algo_strength, mask, mask_strength);
480 printf("ma = %08lx ma_s %08lx, ma&algo=%08lx, ma_s&algos=%08lx\n", ma, ma_s, ma&algorithms, ma_s&algo_strength);
481#endif
482 /*
483 * Select: if none of the mask bit was met from the
484 * cipher or not all of the bits were met, the
485 * selection does not apply.
486 */
487 if (((ma == 0) && (ma_s == 0)) ||
488 ((ma & algorithms) != ma) ||
489 ((ma_s & algo_strength) != ma_s))
490 continue; /* does not apply */
491 }
492 else if (strength_bits != cp->strength_bits)
493 continue; /* does not apply */
494
495#ifdef CIPHER_DEBUG
496 printf("Action = %d\n", rule);
497#endif
498
499 /* add the cipher if it has not been added yet. */
500 if (rule == CIPHER_ADD)
501 {
502 if (!curr->active)
503 {
504 ll_append_tail(&head, curr, &tail);
505 curr->active = 1;
506 }
507 }
508 /* Move the added cipher to this location */
509 else if (rule == CIPHER_ORD)
510 {
511 if (curr->active)
512 {
513 ll_append_tail(&head, curr, &tail);
514 }
515 }
516 else if (rule == CIPHER_DEL)
517 curr->active = 0;
518 else if (rule == CIPHER_KILL)
519 {
520 if (head == curr)
521 head = curr->next;
522 else
523 curr->prev->next = curr->next;
524 if (tail == curr)
525 tail = curr->prev;
526 curr->active = 0;
527 if (curr->next != NULL)
528 curr->next->prev = curr->prev;
529 if (curr->prev != NULL)
530 curr->prev->next = curr->next;
531 curr->next = NULL;
532 curr->prev = NULL;
533 }
534 }
535
536 *head_p = head;
537 *tail_p = tail;
538 }
539
540static int ssl_cipher_strength_sort(CIPHER_ORDER *co_list,
541 CIPHER_ORDER **head_p,
542 CIPHER_ORDER **tail_p)
543 {
544 int max_strength_bits, i, *number_uses;
545 CIPHER_ORDER *curr;
546
547 /*
548 * This routine sorts the ciphers with descending strength. The sorting
549 * must keep the pre-sorted sequence, so we apply the normal sorting
550 * routine as '+' movement to the end of the list.
551 */
552 max_strength_bits = 0;
553 curr = *head_p;
554 while (curr != NULL)
555 {
556 if (curr->active &&
557 (curr->cipher->strength_bits > max_strength_bits))
558 max_strength_bits = curr->cipher->strength_bits;
559 curr = curr->next;
560 }
561
562 number_uses = OPENSSL_malloc((max_strength_bits + 1) * sizeof(int));
563 if (!number_uses)
564 {
565 SSLerr(SSL_F_SSL_CIPHER_STRENGTH_SORT,ERR_R_MALLOC_FAILURE);
566 return(0);
567 }
568 memset(number_uses, 0, (max_strength_bits + 1) * sizeof(int));
569
570 /*
571 * Now find the strength_bits values actually used
572 */
573 curr = *head_p;
574 while (curr != NULL)
575 {
576 if (curr->active)
577 number_uses[curr->cipher->strength_bits]++;
578 curr = curr->next;
579 }
580 /*
581 * Go through the list of used strength_bits values in descending
582 * order.
583 */
584 for (i = max_strength_bits; i >= 0; i--)
585 if (number_uses[i] > 0)
586 ssl_cipher_apply_rule(0, 0, 0, 0, CIPHER_ORD, i,
587 co_list, head_p, tail_p);
588
589 OPENSSL_free(number_uses);
590 return(1);
591 }
592
593static int ssl_cipher_process_rulestr(const char *rule_str,
594 CIPHER_ORDER *co_list, CIPHER_ORDER **head_p,
595 CIPHER_ORDER **tail_p, SSL_CIPHER **ca_list)
596 {
597 unsigned long algorithms, mask, algo_strength, mask_strength;
598 const char *l, *start, *buf;
599 int j, multi, found, rule, retval, ok, buflen;
600 char ch;
601
602 retval = 1;
603 l = rule_str;
604 for (;;)
605 {
606 ch = *l;
607
608 if (ch == '\0')
609 break; /* done */
610 if (ch == '-')
611 { rule = CIPHER_DEL; l++; }
612 else if (ch == '+')
613 { rule = CIPHER_ORD; l++; }
614 else if (ch == '!')
615 { rule = CIPHER_KILL; l++; }
616 else if (ch == '@')
617 { rule = CIPHER_SPECIAL; l++; }
618 else
619 { rule = CIPHER_ADD; }
620
621 if (ITEM_SEP(ch))
622 {
623 l++;
624 continue;
625 }
626
627 algorithms = mask = algo_strength = mask_strength = 0;
628
629 start=l;
630 for (;;)
631 {
632 ch = *l;
633 buf = l;
634 buflen = 0;
635#ifndef CHARSET_EBCDIC
636 while ( ((ch >= 'A') && (ch <= 'Z')) ||
637 ((ch >= '0') && (ch <= '9')) ||
638 ((ch >= 'a') && (ch <= 'z')) ||
639 (ch == '-'))
640#else
641 while ( isalnum(ch) || (ch == '-'))
642#endif
643 {
644 ch = *(++l);
645 buflen++;
646 }
647
648 if (buflen == 0)
649 {
650 /*
651 * We hit something we cannot deal with,
652 * it is no command or separator nor
653 * alphanumeric, so we call this an error.
654 */
655 SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR,
656 SSL_R_INVALID_COMMAND);
657 retval = found = 0;
658 l++;
659 break;
660 }
661
662 if (rule == CIPHER_SPECIAL)
663 {
664 found = 0; /* unused -- avoid compiler warning */
665 break; /* special treatment */
666 }
667
668 /* check for multi-part specification */
669 if (ch == '+')
670 {
671 multi=1;
672 l++;
673 }
674 else
675 multi=0;
676
677 /*
678 * Now search for the cipher alias in the ca_list. Be careful
679 * with the strncmp, because the "buflen" limitation
680 * will make the rule "ADH:SOME" and the cipher
681 * "ADH-MY-CIPHER" look like a match for buflen=3.
682 * So additionally check whether the cipher name found
683 * has the correct length. We can save a strlen() call:
684 * just checking for the '\0' at the right place is
685 * sufficient, we have to strncmp() anyway. (We cannot
686 * use strcmp(), because buf is not '\0' terminated.)
687 */
688 j = found = 0;
689 while (ca_list[j])
690 {
691 if (!strncmp(buf, ca_list[j]->name, buflen) &&
692 (ca_list[j]->name[buflen] == '\0'))
693 {
694 found = 1;
695 break;
696 }
697 else
698 j++;
699 }
700 if (!found)
701 break; /* ignore this entry */
702
703 algorithms |= ca_list[j]->algorithms;
704 mask |= ca_list[j]->mask;
705 algo_strength |= ca_list[j]->algo_strength;
706 mask_strength |= ca_list[j]->mask_strength;
707
708 if (!multi) break;
709 }
710
711 /*
712 * Ok, we have the rule, now apply it
713 */
714 if (rule == CIPHER_SPECIAL)
715 { /* special command */
716 ok = 0;
717 if ((buflen == 8) &&
718 !strncmp(buf, "STRENGTH", 8))
719 ok = ssl_cipher_strength_sort(co_list,
720 head_p, tail_p);
721 else
722 SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR,
723 SSL_R_INVALID_COMMAND);
724 if (ok == 0)
725 retval = 0;
726 /*
727 * We do not support any "multi" options
728 * together with "@", so throw away the
729 * rest of the command, if any left, until
730 * end or ':' is found.
731 */
732 while ((*l != '\0') && ITEM_SEP(*l))
733 l++;
734 }
735 else if (found)
736 {
737 ssl_cipher_apply_rule(algorithms, mask,
738 algo_strength, mask_strength, rule, -1,
739 co_list, head_p, tail_p);
740 }
741 else
742 {
743 while ((*l != '\0') && ITEM_SEP(*l))
744 l++;
745 }
746 if (*l == '\0') break; /* done */
747 }
748
749 return(retval);
750 }
751
752STACK_OF(SSL_CIPHER) *ssl_create_cipher_list(const SSL_METHOD *ssl_method,
753 STACK_OF(SSL_CIPHER) **cipher_list,
754 STACK_OF(SSL_CIPHER) **cipher_list_by_id,
755 const char *rule_str)
756 {
757 int ok, num_of_ciphers, num_of_alias_max, num_of_group_aliases;
758 unsigned long disabled_mask;
759 STACK_OF(SSL_CIPHER) *cipherstack;
760 const char *rule_p;
761 CIPHER_ORDER *co_list = NULL, *head = NULL, *tail = NULL, *curr;
762 SSL_CIPHER **ca_list = NULL;
763
764 /*
765 * Return with error if nothing to do.
766 */
767 if (rule_str == NULL) return(NULL);
768
769 if (init_ciphers)
770 {
771 CRYPTO_w_lock(CRYPTO_LOCK_SSL);
772 if (init_ciphers) load_ciphers();
773 CRYPTO_w_unlock(CRYPTO_LOCK_SSL);
774 }
775
776 /*
777 * To reduce the work to do we only want to process the compiled
778 * in algorithms, so we first get the mask of disabled ciphers.
779 */
780 disabled_mask = ssl_cipher_get_disabled();
781
782 /*
783 * Now we have to collect the available ciphers from the compiled
784 * in ciphers. We cannot get more than the number compiled in, so
785 * it is used for allocation.
786 */
787 num_of_ciphers = ssl_method->num_ciphers();
788#ifdef KSSL_DEBUG
789 printf("ssl_create_cipher_list() for %d ciphers\n", num_of_ciphers);
790#endif /* KSSL_DEBUG */
791 co_list = (CIPHER_ORDER *)OPENSSL_malloc(sizeof(CIPHER_ORDER) * num_of_ciphers);
792 if (co_list == NULL)
793 {
794 SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE);
795 return(NULL); /* Failure */
796 }
797
798 ssl_cipher_collect_ciphers(ssl_method, num_of_ciphers, disabled_mask,
799 co_list, &head, &tail);
800
801 /*
802 * We also need cipher aliases for selecting based on the rule_str.
803 * There might be two types of entries in the rule_str: 1) names
804 * of ciphers themselves 2) aliases for groups of ciphers.
805 * For 1) we need the available ciphers and for 2) the cipher
806 * groups of cipher_aliases added together in one list (otherwise
807 * we would be happy with just the cipher_aliases table).
808 */
809 num_of_group_aliases = sizeof(cipher_aliases) / sizeof(SSL_CIPHER);
810 num_of_alias_max = num_of_ciphers + num_of_group_aliases + 1;
811 ca_list =
812 (SSL_CIPHER **)OPENSSL_malloc(sizeof(SSL_CIPHER *) * num_of_alias_max);
813 if (ca_list == NULL)
814 {
815 OPENSSL_free(co_list);
816 SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE);
817 return(NULL); /* Failure */
818 }
819 ssl_cipher_collect_aliases(ca_list, num_of_group_aliases, disabled_mask,
820 head);
821
822 /*
823 * If the rule_string begins with DEFAULT, apply the default rule
824 * before using the (possibly available) additional rules.
825 */
826 ok = 1;
827 rule_p = rule_str;
828 if (strncmp(rule_str,"DEFAULT",7) == 0)
829 {
830 ok = ssl_cipher_process_rulestr(SSL_DEFAULT_CIPHER_LIST,
831 co_list, &head, &tail, ca_list);
832 rule_p += 7;
833 if (*rule_p == ':')
834 rule_p++;
835 }
836
837 if (ok && (strlen(rule_p) > 0))
838 ok = ssl_cipher_process_rulestr(rule_p, co_list, &head, &tail,
839 ca_list);
840
841 OPENSSL_free(ca_list); /* Not needed anymore */
842
843 if (!ok)
844 { /* Rule processing failure */
845 OPENSSL_free(co_list);
846 return(NULL);
847 }
848 /*
849 * Allocate new "cipherstack" for the result, return with error
850 * if we cannot get one.
851 */
852 if ((cipherstack = sk_SSL_CIPHER_new_null()) == NULL)
853 {
854 OPENSSL_free(co_list);
855 return(NULL);
856 }
857
858 /*
859 * The cipher selection for the list is done. The ciphers are added
860 * to the resulting precedence to the STACK_OF(SSL_CIPHER).
861 */
862 for (curr = head; curr != NULL; curr = curr->next)
863 {
864#ifdef OPENSSL_FIPS
865 if (curr->active && (!FIPS_mode() || curr->cipher->algo_strength & SSL_FIPS))
866#else
867 if (curr->active)
868#endif
869 {
870 sk_SSL_CIPHER_push(cipherstack, curr->cipher);
871#ifdef CIPHER_DEBUG
872 printf("<%s>\n",curr->cipher->name);
873#endif
874 }
875 }
876 OPENSSL_free(co_list); /* Not needed any longer */
877
878 /*
879 * The following passage is a little bit odd. If pointer variables
880 * were supplied to hold STACK_OF(SSL_CIPHER) return information,
881 * the old memory pointed to is free()ed. Then, however, the
882 * cipher_list entry will be assigned just a copy of the returned
883 * cipher stack. For cipher_list_by_id a copy of the cipher stack
884 * will be created. See next comment...
885 */
886 if (cipher_list != NULL)
887 {
888 if (*cipher_list != NULL)
889 sk_SSL_CIPHER_free(*cipher_list);
890 *cipher_list = cipherstack;
891 }
892
893 if (cipher_list_by_id != NULL)
894 {
895 if (*cipher_list_by_id != NULL)
896 sk_SSL_CIPHER_free(*cipher_list_by_id);
897 *cipher_list_by_id = sk_SSL_CIPHER_dup(cipherstack);
898 }
899
900 /*
901 * Now it is getting really strange. If something failed during
902 * the previous pointer assignment or if one of the pointers was
903 * not requested, the error condition is met. That might be
904 * discussable. The strange thing is however that in this case
905 * the memory "ret" pointed to is "free()ed" and hence the pointer
906 * cipher_list becomes wild. The memory reserved for
907 * cipher_list_by_id however is not "free()ed" and stays intact.
908 */
909 if ( (cipher_list_by_id == NULL) ||
910 (*cipher_list_by_id == NULL) ||
911 (cipher_list == NULL) ||
912 (*cipher_list == NULL))
913 {
914 sk_SSL_CIPHER_free(cipherstack);
915 return(NULL);
916 }
917
918 sk_SSL_CIPHER_set_cmp_func(*cipher_list_by_id,ssl_cipher_ptr_id_cmp);
919
920 return(cipherstack);
921 }
922
923char *SSL_CIPHER_description(SSL_CIPHER *cipher, char *buf, int len)
924 {
925 int is_export,pkl,kl;
926 char *ver,*exp_str;
927 char *kx,*au,*enc,*mac;
928 unsigned long alg,alg2,alg_s;
929#ifdef KSSL_DEBUG
930 static char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s AL=%lx\n";
931#else
932 static char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s\n";
933#endif /* KSSL_DEBUG */
934
935 alg=cipher->algorithms;
936 alg_s=cipher->algo_strength;
937 alg2=cipher->algorithm2;
938
939 is_export=SSL_C_IS_EXPORT(cipher);
940 pkl=SSL_C_EXPORT_PKEYLENGTH(cipher);
941 kl=SSL_C_EXPORT_KEYLENGTH(cipher);
942 exp_str=is_export?" export":"";
943
944 if (alg & SSL_SSLV2)
945 ver="SSLv2";
946 else if (alg & SSL_SSLV3)
947 ver="SSLv3";
948 else
949 ver="unknown";
950
951 switch (alg&SSL_MKEY_MASK)
952 {
953 case SSL_kRSA:
954 kx=is_export?(pkl == 512 ? "RSA(512)" : "RSA(1024)"):"RSA";
955 break;
956 case SSL_kDHr:
957 kx="DH/RSA";
958 break;
959 case SSL_kDHd:
960 kx="DH/DSS";
961 break;
962 case SSL_kKRB5: /* VRS */
963 case SSL_KRB5: /* VRS */
964 kx="KRB5";
965 break;
966 case SSL_kFZA:
967 kx="Fortezza";
968 break;
969 case SSL_kEDH:
970 kx=is_export?(pkl == 512 ? "DH(512)" : "DH(1024)"):"DH";
971 break;
972 default:
973 kx="unknown";
974 }
975
976 switch (alg&SSL_AUTH_MASK)
977 {
978 case SSL_aRSA:
979 au="RSA";
980 break;
981 case SSL_aDSS:
982 au="DSS";
983 break;
984 case SSL_aDH:
985 au="DH";
986 break;
987 case SSL_aKRB5: /* VRS */
988 case SSL_KRB5: /* VRS */
989 au="KRB5";
990 break;
991 case SSL_aFZA:
992 case SSL_aNULL:
993 au="None";
994 break;
995 default:
996 au="unknown";
997 break;
998 }
999
1000 switch (alg&SSL_ENC_MASK)
1001 {
1002 case SSL_DES:
1003 enc=(is_export && kl == 5)?"DES(40)":"DES(56)";
1004 break;
1005 case SSL_3DES:
1006 enc="3DES(168)";
1007 break;
1008 case SSL_RC4:
1009 enc=is_export?(kl == 5 ? "RC4(40)" : "RC4(56)")
1010 :((alg2&SSL2_CF_8_BYTE_ENC)?"RC4(64)":"RC4(128)");
1011 break;
1012 case SSL_RC2:
1013 enc=is_export?(kl == 5 ? "RC2(40)" : "RC2(56)"):"RC2(128)";
1014 break;
1015 case SSL_IDEA:
1016 enc="IDEA(128)";
1017 break;
1018 case SSL_eFZA:
1019 enc="Fortezza";
1020 break;
1021 case SSL_eNULL:
1022 enc="None";
1023 break;
1024 case SSL_AES:
1025 switch(cipher->strength_bits)
1026 {
1027 case 128: enc="AES(128)"; break;
1028 case 192: enc="AES(192)"; break;
1029 case 256: enc="AES(256)"; break;
1030 default: enc="AES(?""?""?)"; break;
1031 }
1032 break;
1033 default:
1034 enc="unknown";
1035 break;
1036 }
1037
1038 switch (alg&SSL_MAC_MASK)
1039 {
1040 case SSL_MD5:
1041 mac="MD5";
1042 break;
1043 case SSL_SHA1:
1044 mac="SHA1";
1045 break;
1046 default:
1047 mac="unknown";
1048 break;
1049 }
1050
1051 if (buf == NULL)
1052 {
1053 len=128;
1054 buf=OPENSSL_malloc(len);
1055 if (buf == NULL) return("OPENSSL_malloc Error");
1056 }
1057 else if (len < 128)
1058 return("Buffer too small");
1059
1060#ifdef KSSL_DEBUG
1061 BIO_snprintf(buf,len,format,cipher->name,ver,kx,au,enc,mac,exp_str,alg);
1062#else
1063 BIO_snprintf(buf,len,format,cipher->name,ver,kx,au,enc,mac,exp_str);
1064#endif /* KSSL_DEBUG */
1065 return(buf);
1066 }
1067
1068char *SSL_CIPHER_get_version(const SSL_CIPHER *c)
1069 {
1070 int i;
1071
1072 if (c == NULL) return("(NONE)");
1073 i=(int)(c->id>>24L);
1074 if (i == 3)
1075 return("TLSv1/SSLv3");
1076 else if (i == 2)
1077 return("SSLv2");
1078 else
1079 return("unknown");
1080 }
1081
1082/* return the actual cipher being used */
1083const char *SSL_CIPHER_get_name(const SSL_CIPHER *c)
1084 {
1085 if (c != NULL)
1086 return(c->name);
1087 return("(NONE)");
1088 }
1089
1090/* number of bits for symmetric cipher */
1091int SSL_CIPHER_get_bits(const SSL_CIPHER *c, int *alg_bits)
1092 {
1093 int ret=0;
1094
1095 if (c != NULL)
1096 {
1097 if (alg_bits != NULL) *alg_bits = c->alg_bits;
1098 ret = c->strength_bits;
1099 }
1100 return(ret);
1101 }
1102
1103SSL_COMP *ssl3_comp_find(STACK_OF(SSL_COMP) *sk, int n)
1104 {
1105 SSL_COMP *ctmp;
1106 int i,nn;
1107
1108 if ((n == 0) || (sk == NULL)) return(NULL);
1109 nn=sk_SSL_COMP_num(sk);
1110 for (i=0; i<nn; i++)
1111 {
1112 ctmp=sk_SSL_COMP_value(sk,i);
1113 if (ctmp->id == n)
1114 return(ctmp);
1115 }
1116 return(NULL);
1117 }
1118
1119static int sk_comp_cmp(const SSL_COMP * const *a,
1120 const SSL_COMP * const *b)
1121 {
1122 return((*a)->id-(*b)->id);
1123 }
1124
1125STACK_OF(SSL_COMP) *SSL_COMP_get_compression_methods(void)
1126 {
1127 return(ssl_comp_methods);
1128 }
1129
1130int SSL_COMP_add_compression_method(int id, COMP_METHOD *cm)
1131 {
1132 SSL_COMP *comp;
1133 STACK_OF(SSL_COMP) *sk;
1134
1135 if (cm == NULL || cm->type == NID_undef)
1136 return 1;
1137
1138 MemCheck_off();
1139 comp=(SSL_COMP *)OPENSSL_malloc(sizeof(SSL_COMP));
1140 comp->id=id;
1141 comp->method=cm;
1142 if (ssl_comp_methods == NULL)
1143 sk=ssl_comp_methods=sk_SSL_COMP_new(sk_comp_cmp);
1144 else
1145 sk=ssl_comp_methods;
1146 if ((sk == NULL) || !sk_SSL_COMP_push(sk,comp))
1147 {
1148 MemCheck_on();
1149 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,ERR_R_MALLOC_FAILURE);
1150 return(1);
1151 }
1152 else
1153 {
1154 MemCheck_on();
1155 return(0);
1156 }
1157 }
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