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