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