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authorcvs2svn <admin@example.com>2002-03-12 00:05:45 +0000
committercvs2svn <admin@example.com>2002-03-12 00:05:45 +0000
commit3779f2f4a8b544a7e4c362915322726b66cff114 (patch)
treeb6d77e66cbfdf6c0d8953fba2917f26f86fa50f6 /src/lib/libssl/ssl_ciph.c
parentf39945c2b3b0f9e4950384bdb8effdac6eed9199 (diff)
downloadopenbsd-OPENBSD_3_1_BASE.tar.gz
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This commit was manufactured by cvs2git to create tag 'OPENBSD_3_1_BASE'.OPENBSD_3_1_BASE
Diffstat (limited to 'src/lib/libssl/ssl_ciph.c')
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diff --git a/src/lib/libssl/ssl_ciph.c b/src/lib/libssl/ssl_ciph.c
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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_NUM_IDX 7
72
73static const EVP_CIPHER *ssl_cipher_methods[SSL_ENC_NUM_IDX]={
74 NULL,NULL,NULL,NULL,NULL,NULL,
75 };
76
77static STACK_OF(SSL_COMP) *ssl_comp_methods=NULL;
78
79#define SSL_MD_MD5_IDX 0
80#define SSL_MD_SHA1_IDX 1
81#define SSL_MD_NUM_IDX 2
82static const EVP_MD *ssl_digest_methods[SSL_MD_NUM_IDX]={
83 NULL,NULL,
84 };
85
86#define CIPHER_ADD 1
87#define CIPHER_KILL 2
88#define CIPHER_DEL 3
89#define CIPHER_ORD 4
90#define CIPHER_SPECIAL 5
91
92typedef struct cipher_order_st
93 {
94 SSL_CIPHER *cipher;
95 int active;
96 int dead;
97 struct cipher_order_st *next,*prev;
98 } CIPHER_ORDER;
99
100static const SSL_CIPHER cipher_aliases[]={
101 /* Don't include eNULL unless specifically enabled */
102 {0,SSL_TXT_ALL, 0,SSL_ALL & ~SSL_eNULL, SSL_ALL ,0,0,0,SSL_ALL,SSL_ALL}, /* must be first */
103 {0,SSL_TXT_kRSA,0,SSL_kRSA, 0,0,0,0,SSL_MKEY_MASK,0},
104 {0,SSL_TXT_kDHr,0,SSL_kDHr, 0,0,0,0,SSL_MKEY_MASK,0},
105 {0,SSL_TXT_kDHd,0,SSL_kDHd, 0,0,0,0,SSL_MKEY_MASK,0},
106 {0,SSL_TXT_kEDH,0,SSL_kEDH, 0,0,0,0,SSL_MKEY_MASK,0},
107 {0,SSL_TXT_kFZA,0,SSL_kFZA, 0,0,0,0,SSL_MKEY_MASK,0},
108 {0,SSL_TXT_DH, 0,SSL_DH, 0,0,0,0,SSL_MKEY_MASK,0},
109 {0,SSL_TXT_EDH, 0,SSL_EDH, 0,0,0,0,SSL_MKEY_MASK|SSL_AUTH_MASK,0},
110
111 {0,SSL_TXT_aRSA,0,SSL_aRSA, 0,0,0,0,SSL_AUTH_MASK,0},
112 {0,SSL_TXT_aDSS,0,SSL_aDSS, 0,0,0,0,SSL_AUTH_MASK,0},
113 {0,SSL_TXT_aFZA,0,SSL_aFZA, 0,0,0,0,SSL_AUTH_MASK,0},
114 {0,SSL_TXT_aNULL,0,SSL_aNULL,0,0,0,0,SSL_AUTH_MASK,0},
115 {0,SSL_TXT_aDH, 0,SSL_aDH, 0,0,0,0,SSL_AUTH_MASK,0},
116 {0,SSL_TXT_DSS, 0,SSL_DSS, 0,0,0,0,SSL_AUTH_MASK,0},
117
118 {0,SSL_TXT_DES, 0,SSL_DES, 0,0,0,0,SSL_ENC_MASK,0},
119 {0,SSL_TXT_3DES,0,SSL_3DES, 0,0,0,0,SSL_ENC_MASK,0},
120 {0,SSL_TXT_RC4, 0,SSL_RC4, 0,0,0,0,SSL_ENC_MASK,0},
121 {0,SSL_TXT_RC2, 0,SSL_RC2, 0,0,0,0,SSL_ENC_MASK,0},
122 {0,SSL_TXT_IDEA,0,SSL_IDEA, 0,0,0,0,SSL_ENC_MASK,0},
123 {0,SSL_TXT_eNULL,0,SSL_eNULL,0,0,0,0,SSL_ENC_MASK,0},
124 {0,SSL_TXT_eFZA,0,SSL_eFZA, 0,0,0,0,SSL_ENC_MASK,0},
125
126 {0,SSL_TXT_MD5, 0,SSL_MD5, 0,0,0,0,SSL_MAC_MASK,0},
127 {0,SSL_TXT_SHA1,0,SSL_SHA1, 0,0,0,0,SSL_MAC_MASK,0},
128 {0,SSL_TXT_SHA, 0,SSL_SHA, 0,0,0,0,SSL_MAC_MASK,0},
129
130 {0,SSL_TXT_NULL,0,SSL_NULL, 0,0,0,0,SSL_ENC_MASK,0},
131 {0,SSL_TXT_RSA, 0,SSL_RSA, 0,0,0,0,SSL_AUTH_MASK|SSL_MKEY_MASK,0},
132 {0,SSL_TXT_ADH, 0,SSL_ADH, 0,0,0,0,SSL_AUTH_MASK|SSL_MKEY_MASK,0},
133 {0,SSL_TXT_FZA, 0,SSL_FZA, 0,0,0,0,SSL_AUTH_MASK|SSL_MKEY_MASK|SSL_ENC_MASK,0},
134
135 {0,SSL_TXT_SSLV2, 0,SSL_SSLV2, 0,0,0,0,SSL_SSL_MASK,0},
136 {0,SSL_TXT_SSLV3, 0,SSL_SSLV3, 0,0,0,0,SSL_SSL_MASK,0},
137 {0,SSL_TXT_TLSV1, 0,SSL_TLSV1, 0,0,0,0,SSL_SSL_MASK,0},
138
139 {0,SSL_TXT_EXP ,0, 0,SSL_EXPORT, 0,0,0,0,SSL_EXP_MASK},
140 {0,SSL_TXT_EXPORT,0, 0,SSL_EXPORT, 0,0,0,0,SSL_EXP_MASK},
141 {0,SSL_TXT_EXP40, 0, 0, SSL_EXP40, 0,0,0,0,SSL_STRONG_MASK},
142 {0,SSL_TXT_EXP56, 0, 0, SSL_EXP56, 0,0,0,0,SSL_STRONG_MASK},
143 {0,SSL_TXT_LOW, 0, 0, SSL_LOW, 0,0,0,0,SSL_STRONG_MASK},
144 {0,SSL_TXT_MEDIUM,0, 0,SSL_MEDIUM, 0,0,0,0,SSL_STRONG_MASK},
145 {0,SSL_TXT_HIGH, 0, 0, SSL_HIGH, 0,0,0,0,SSL_STRONG_MASK},
146 };
147
148static int init_ciphers=1;
149
150static void load_ciphers(void)
151 {
152 init_ciphers=0;
153 ssl_cipher_methods[SSL_ENC_DES_IDX]=
154 EVP_get_cipherbyname(SN_des_cbc);
155 ssl_cipher_methods[SSL_ENC_3DES_IDX]=
156 EVP_get_cipherbyname(SN_des_ede3_cbc);
157 ssl_cipher_methods[SSL_ENC_RC4_IDX]=
158 EVP_get_cipherbyname(SN_rc4);
159 ssl_cipher_methods[SSL_ENC_RC2_IDX]=
160 EVP_get_cipherbyname(SN_rc2_cbc);
161 ssl_cipher_methods[SSL_ENC_IDEA_IDX]=
162 EVP_get_cipherbyname(SN_idea_cbc);
163
164 ssl_digest_methods[SSL_MD_MD5_IDX]=
165 EVP_get_digestbyname(SN_md5);
166 ssl_digest_methods[SSL_MD_SHA1_IDX]=
167 EVP_get_digestbyname(SN_sha1);
168 }
169
170int ssl_cipher_get_evp(SSL_SESSION *s, const EVP_CIPHER **enc,
171 const EVP_MD **md, SSL_COMP **comp)
172 {
173 int i;
174 SSL_CIPHER *c;
175
176 c=s->cipher;
177 if (c == NULL) return(0);
178 if (comp != NULL)
179 {
180 SSL_COMP ctmp;
181
182 if (s->compress_meth == 0)
183 *comp=NULL;
184 else if (ssl_comp_methods == NULL)
185 {
186 /* bad */
187 *comp=NULL;
188 }
189 else
190 {
191
192 ctmp.id=s->compress_meth;
193 i=sk_SSL_COMP_find(ssl_comp_methods,&ctmp);
194 if (i >= 0)
195 *comp=sk_SSL_COMP_value(ssl_comp_methods,i);
196 else
197 *comp=NULL;
198 }
199 }
200
201 if ((enc == NULL) || (md == NULL)) return(0);
202
203 switch (c->algorithms & SSL_ENC_MASK)
204 {
205 case SSL_DES:
206 i=SSL_ENC_DES_IDX;
207 break;
208 case SSL_3DES:
209 i=SSL_ENC_3DES_IDX;
210 break;
211 case SSL_RC4:
212 i=SSL_ENC_RC4_IDX;
213 break;
214 case SSL_RC2:
215 i=SSL_ENC_RC2_IDX;
216 break;
217 case SSL_IDEA:
218 i=SSL_ENC_IDEA_IDX;
219 break;
220 case SSL_eNULL:
221 i=SSL_ENC_NULL_IDX;
222 break;
223 default:
224 i= -1;
225 break;
226 }
227
228 if ((i < 0) || (i > SSL_ENC_NUM_IDX))
229 *enc=NULL;
230 else
231 {
232 if (i == SSL_ENC_NULL_IDX)
233 *enc=EVP_enc_null();
234 else
235 *enc=ssl_cipher_methods[i];
236 }
237
238 switch (c->algorithms & SSL_MAC_MASK)
239 {
240 case SSL_MD5:
241 i=SSL_MD_MD5_IDX;
242 break;
243 case SSL_SHA1:
244 i=SSL_MD_SHA1_IDX;
245 break;
246 default:
247 i= -1;
248 break;
249 }
250 if ((i < 0) || (i > SSL_MD_NUM_IDX))
251 *md=NULL;
252 else
253 *md=ssl_digest_methods[i];
254
255 if ((*enc != NULL) && (*md != NULL))
256 return(1);
257 else
258 return(0);
259 }
260
261#define ITEM_SEP(a) \
262 (((a) == ':') || ((a) == ' ') || ((a) == ';') || ((a) == ','))
263
264static void ll_append_tail(CIPHER_ORDER **head, CIPHER_ORDER *curr,
265 CIPHER_ORDER **tail)
266 {
267 if (curr == *tail) return;
268 if (curr == *head)
269 *head=curr->next;
270 if (curr->prev != NULL)
271 curr->prev->next=curr->next;
272 if (curr->next != NULL) /* should always be true */
273 curr->next->prev=curr->prev;
274 (*tail)->next=curr;
275 curr->prev= *tail;
276 curr->next=NULL;
277 *tail=curr;
278 }
279
280static unsigned long ssl_cipher_get_disabled(void)
281 {
282 unsigned long mask;
283
284 mask = SSL_kFZA;
285#ifdef NO_RSA
286 mask |= SSL_aRSA|SSL_kRSA;
287#endif
288#ifdef NO_DSA
289 mask |= SSL_aDSS;
290#endif
291#ifdef NO_DH
292 mask |= SSL_kDHr|SSL_kDHd|SSL_kEDH|SSL_aDH;
293#endif
294
295#ifdef SSL_FORBID_ENULL
296 mask |= SSL_eNULL;
297#endif
298
299 mask |= (ssl_cipher_methods[SSL_ENC_DES_IDX ] == NULL) ? SSL_DES :0;
300 mask |= (ssl_cipher_methods[SSL_ENC_3DES_IDX] == NULL) ? SSL_3DES:0;
301 mask |= (ssl_cipher_methods[SSL_ENC_RC4_IDX ] == NULL) ? SSL_RC4 :0;
302 mask |= (ssl_cipher_methods[SSL_ENC_RC2_IDX ] == NULL) ? SSL_RC2 :0;
303 mask |= (ssl_cipher_methods[SSL_ENC_IDEA_IDX] == NULL) ? SSL_IDEA:0;
304 mask |= (ssl_cipher_methods[SSL_ENC_eFZA_IDX] == NULL) ? SSL_eFZA:0;
305
306 mask |= (ssl_digest_methods[SSL_MD_MD5_IDX ] == NULL) ? SSL_MD5 :0;
307 mask |= (ssl_digest_methods[SSL_MD_SHA1_IDX] == NULL) ? SSL_SHA1:0;
308
309 return(mask);
310 }
311
312static void ssl_cipher_collect_ciphers(const SSL_METHOD *ssl_method,
313 int num_of_ciphers, unsigned long mask, CIPHER_ORDER *list,
314 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
315 {
316 int i, list_num;
317 SSL_CIPHER *c;
318
319 /*
320 * We have num_of_ciphers descriptions compiled in, depending on the
321 * method selected (SSLv2 and/or SSLv3, TLSv1 etc).
322 * These will later be sorted in a linked list with at most num
323 * entries.
324 */
325
326 /* Get the initial list of ciphers */
327 list_num = 0; /* actual count of ciphers */
328 for (i = 0; i < num_of_ciphers; i++)
329 {
330 c = ssl_method->get_cipher(i);
331 /* drop those that use any of that is not available */
332 if ((c != NULL) && c->valid && !(c->algorithms & mask))
333 {
334 list[list_num].cipher = c;
335 list[list_num].next = NULL;
336 list[list_num].prev = NULL;
337 list[list_num].active = 0;
338 list_num++;
339 /*
340 if (!sk_push(ca_list,(char *)c)) goto err;
341 */
342 }
343 }
344
345 /*
346 * Prepare linked list from list entries
347 */
348 for (i = 1; i < list_num - 1; i++)
349 {
350 list[i].prev = &(list[i-1]);
351 list[i].next = &(list[i+1]);
352 }
353 if (list_num > 0)
354 {
355 (*head_p) = &(list[0]);
356 (*head_p)->prev = NULL;
357 (*head_p)->next = &(list[1]);
358 (*tail_p) = &(list[list_num - 1]);
359 (*tail_p)->prev = &(list[list_num - 2]);
360 (*tail_p)->next = NULL;
361 }
362 }
363
364static void ssl_cipher_collect_aliases(SSL_CIPHER **ca_list,
365 int num_of_group_aliases, unsigned long mask,
366 CIPHER_ORDER *head)
367 {
368 CIPHER_ORDER *ciph_curr;
369 SSL_CIPHER **ca_curr;
370 int i;
371
372 /*
373 * First, add the real ciphers as already collected
374 */
375 ciph_curr = head;
376 ca_curr = ca_list;
377 while (ciph_curr != NULL)
378 {
379 *ca_curr = ciph_curr->cipher;
380 ca_curr++;
381 ciph_curr = ciph_curr->next;
382 }
383
384 /*
385 * Now we add the available ones from the cipher_aliases[] table.
386 * They represent either an algorithm, that must be fully
387 * supported (not match any bit in mask) or represent a cipher
388 * strength value (will be added in any case because algorithms=0).
389 */
390 for (i = 0; i < num_of_group_aliases; i++)
391 {
392 if ((i == 0) || /* always fetch "ALL" */
393 !(cipher_aliases[i].algorithms & mask))
394 {
395 *ca_curr = (SSL_CIPHER *)(cipher_aliases + i);
396 ca_curr++;
397 }
398 }
399
400 *ca_curr = NULL; /* end of list */
401 }
402
403static void ssl_cipher_apply_rule(unsigned long algorithms, unsigned long mask,
404 unsigned long algo_strength, unsigned long mask_strength,
405 int rule, int strength_bits, CIPHER_ORDER *list,
406 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
407 {
408 CIPHER_ORDER *head, *tail, *curr, *curr2, *tail2;
409 SSL_CIPHER *cp;
410 unsigned long ma, ma_s;
411
412#ifdef CIPHER_DEBUG
413 printf("Applying rule %d with %08lx %08lx %08lx %08lx (%d)\n",
414 rule, algorithms, mask, algo_strength, mask_strength,
415 strength_bits);
416#endif
417
418 curr = head = *head_p;
419 curr2 = head;
420 tail2 = tail = *tail_p;
421 for (;;)
422 {
423 if ((curr == NULL) || (curr == tail2)) break;
424 curr = curr2;
425 curr2 = curr->next;
426
427 cp = curr->cipher;
428
429 /*
430 * Selection criteria is either the number of strength_bits
431 * or the algorithm used.
432 */
433 if (strength_bits == -1)
434 {
435 ma = mask & cp->algorithms;
436 ma_s = mask_strength & cp->algo_strength;
437
438#ifdef CIPHER_DEBUG
439 printf("\nName: %s:\nAlgo = %08lx Algo_strength = %08lx\nMask = %08lx Mask_strength %08lx\n", cp->name, cp->algorithms, cp->algo_strength, mask, mask_strength);
440 printf("ma = %08lx ma_s %08lx, ma&algo=%08lx, ma_s&algos=%08lx\n", ma, ma_s, ma&algorithms, ma_s&algo_strength);
441#endif
442 /*
443 * Select: if none of the mask bit was met from the
444 * cipher or not all of the bits were met, the
445 * selection does not apply.
446 */
447 if (((ma == 0) && (ma_s == 0)) ||
448 ((ma & algorithms) != ma) ||
449 ((ma_s & algo_strength) != ma_s))
450 continue; /* does not apply */
451 }
452 else if (strength_bits != cp->strength_bits)
453 continue; /* does not apply */
454
455#ifdef CIPHER_DEBUG
456 printf("Action = %d\n", rule);
457#endif
458
459 /* add the cipher if it has not been added yet. */
460 if (rule == CIPHER_ADD)
461 {
462 if (!curr->active)
463 {
464 ll_append_tail(&head, curr, &tail);
465 curr->active = 1;
466 }
467 }
468 /* Move the added cipher to this location */
469 else if (rule == CIPHER_ORD)
470 {
471 if (curr->active)
472 {
473 ll_append_tail(&head, curr, &tail);
474 }
475 }
476 else if (rule == CIPHER_DEL)
477 curr->active = 0;
478 else if (rule == CIPHER_KILL)
479 {
480 if (head == curr)
481 head = curr->next;
482 else
483 curr->prev->next = curr->next;
484 if (tail == curr)
485 tail = curr->prev;
486 curr->active = 0;
487 if (curr->next != NULL)
488 curr->next->prev = curr->prev;
489 if (curr->prev != NULL)
490 curr->prev->next = curr->next;
491 curr->next = NULL;
492 curr->prev = NULL;
493 }
494 }
495
496 *head_p = head;
497 *tail_p = tail;
498 }
499
500static int ssl_cipher_strength_sort(CIPHER_ORDER *list, CIPHER_ORDER **head_p,
501 CIPHER_ORDER **tail_p)
502 {
503 int max_strength_bits, i, *number_uses;
504 CIPHER_ORDER *curr;
505
506 /*
507 * This routine sorts the ciphers with descending strength. The sorting
508 * must keep the pre-sorted sequence, so we apply the normal sorting
509 * routine as '+' movement to the end of the list.
510 */
511 max_strength_bits = 0;
512 curr = *head_p;
513 while (curr != NULL)
514 {
515 if (curr->active &&
516 (curr->cipher->strength_bits > max_strength_bits))
517 max_strength_bits = curr->cipher->strength_bits;
518 curr = curr->next;
519 }
520
521 number_uses = OPENSSL_malloc((max_strength_bits + 1) * sizeof(int));
522 if (!number_uses)
523 {
524 SSLerr(SSL_F_SSL_CIPHER_STRENGTH_SORT,ERR_R_MALLOC_FAILURE);
525 return(0);
526 }
527 memset(number_uses, 0, (max_strength_bits + 1) * sizeof(int));
528
529 /*
530 * Now find the strength_bits values actually used
531 */
532 curr = *head_p;
533 while (curr != NULL)
534 {
535 if (curr->active)
536 number_uses[curr->cipher->strength_bits]++;
537 curr = curr->next;
538 }
539 /*
540 * Go through the list of used strength_bits values in descending
541 * order.
542 */
543 for (i = max_strength_bits; i >= 0; i--)
544 if (number_uses[i] > 0)
545 ssl_cipher_apply_rule(0, 0, 0, 0, CIPHER_ORD, i,
546 list, head_p, tail_p);
547
548 OPENSSL_free(number_uses);
549 return(1);
550 }
551
552static int ssl_cipher_process_rulestr(const char *rule_str,
553 CIPHER_ORDER *list, CIPHER_ORDER **head_p,
554 CIPHER_ORDER **tail_p, SSL_CIPHER **ca_list)
555 {
556 unsigned long algorithms, mask, algo_strength, mask_strength;
557 const char *l, *start, *buf;
558 int j, multi, found, rule, retval, ok, buflen;
559 char ch;
560
561 retval = 1;
562 l = rule_str;
563 for (;;)
564 {
565 ch = *l;
566
567 if (ch == '\0')
568 break; /* done */
569 if (ch == '-')
570 { rule = CIPHER_DEL; l++; }
571 else if (ch == '+')
572 { rule = CIPHER_ORD; l++; }
573 else if (ch == '!')
574 { rule = CIPHER_KILL; l++; }
575 else if (ch == '@')
576 { rule = CIPHER_SPECIAL; l++; }
577 else
578 { rule = CIPHER_ADD; }
579
580 if (ITEM_SEP(ch))
581 {
582 l++;
583 continue;
584 }
585
586 algorithms = mask = algo_strength = mask_strength = 0;
587
588 start=l;
589 for (;;)
590 {
591 ch = *l;
592 buf = l;
593 buflen = 0;
594#ifndef CHARSET_EBCDIC
595 while ( ((ch >= 'A') && (ch <= 'Z')) ||
596 ((ch >= '0') && (ch <= '9')) ||
597 ((ch >= 'a') && (ch <= 'z')) ||
598 (ch == '-'))
599#else
600 while ( isalnum(ch) || (ch == '-'))
601#endif
602 {
603 ch = *(++l);
604 buflen++;
605 }
606
607 if (buflen == 0)
608 {
609 /*
610 * We hit something we cannot deal with,
611 * it is no command or separator nor
612 * alphanumeric, so we call this an error.
613 */
614 SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR,
615 SSL_R_INVALID_COMMAND);
616 retval = found = 0;
617 l++;
618 break;
619 }
620
621 if (rule == CIPHER_SPECIAL)
622 {
623 found = 0; /* unused -- avoid compiler warning */
624 break; /* special treatment */
625 }
626
627 /* check for multi-part specification */
628 if (ch == '+')
629 {
630 multi=1;
631 l++;
632 }
633 else
634 multi=0;
635
636 /*
637 * Now search for the cipher alias in the ca_list. Be careful
638 * with the strncmp, because the "buflen" limitation
639 * will make the rule "ADH:SOME" and the cipher
640 * "ADH-MY-CIPHER" look like a match for buflen=3.
641 * So additionally check whether the cipher name found
642 * has the correct length. We can save a strlen() call:
643 * just checking for the '\0' at the right place is
644 * sufficient, we have to strncmp() anyway.
645 */
646 j = found = 0;
647 while (ca_list[j])
648 {
649 if ((ca_list[j]->name[buflen] == '\0') &&
650 !strncmp(buf, ca_list[j]->name, buflen))
651 {
652 found = 1;
653 break;
654 }
655 else
656 j++;
657 }
658 if (!found)
659 break; /* ignore this entry */
660
661 algorithms |= ca_list[j]->algorithms;
662 mask |= ca_list[j]->mask;
663 algo_strength |= ca_list[j]->algo_strength;
664 mask_strength |= ca_list[j]->mask_strength;
665
666 if (!multi) break;
667 }
668
669 /*
670 * Ok, we have the rule, now apply it
671 */
672 if (rule == CIPHER_SPECIAL)
673 { /* special command */
674 ok = 0;
675 if ((buflen == 8) &&
676 !strncmp(buf, "STRENGTH", 8))
677 ok = ssl_cipher_strength_sort(list,
678 head_p, tail_p);
679 else
680 SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR,
681 SSL_R_INVALID_COMMAND);
682 if (ok == 0)
683 retval = 0;
684 /*
685 * We do not support any "multi" options
686 * together with "@", so throw away the
687 * rest of the command, if any left, until
688 * end or ':' is found.
689 */
690 while ((*l != '\0') && ITEM_SEP(*l))
691 l++;
692 }
693 else if (found)
694 {
695 ssl_cipher_apply_rule(algorithms, mask,
696 algo_strength, mask_strength, rule, -1,
697 list, head_p, tail_p);
698 }
699 else
700 {
701 while ((*l != '\0') && ITEM_SEP(*l))
702 l++;
703 }
704 if (*l == '\0') break; /* done */
705 }
706
707 return(retval);
708 }
709
710STACK_OF(SSL_CIPHER) *ssl_create_cipher_list(const SSL_METHOD *ssl_method,
711 STACK_OF(SSL_CIPHER) **cipher_list,
712 STACK_OF(SSL_CIPHER) **cipher_list_by_id,
713 const char *rule_str)
714 {
715 int ok, num_of_ciphers, num_of_alias_max, num_of_group_aliases;
716 unsigned long disabled_mask;
717 STACK_OF(SSL_CIPHER) *cipherstack;
718 const char *rule_p;
719 CIPHER_ORDER *list = NULL, *head = NULL, *tail = NULL, *curr;
720 SSL_CIPHER **ca_list = NULL;
721
722 /*
723 * Return with error if nothing to do.
724 */
725 if (rule_str == NULL) return(NULL);
726
727 if (init_ciphers) load_ciphers();
728
729 /*
730 * To reduce the work to do we only want to process the compiled
731 * in algorithms, so we first get the mask of disabled ciphers.
732 */
733 disabled_mask = ssl_cipher_get_disabled();
734
735 /*
736 * Now we have to collect the available ciphers from the compiled
737 * in ciphers. We cannot get more than the number compiled in, so
738 * it is used for allocation.
739 */
740 num_of_ciphers = ssl_method->num_ciphers();
741 list = (CIPHER_ORDER *)OPENSSL_malloc(sizeof(CIPHER_ORDER) * num_of_ciphers);
742 if (list == NULL)
743 {
744 SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE);
745 return(NULL); /* Failure */
746 }
747
748 ssl_cipher_collect_ciphers(ssl_method, num_of_ciphers, disabled_mask,
749 list, &head, &tail);
750
751 /*
752 * We also need cipher aliases for selecting based on the rule_str.
753 * There might be two types of entries in the rule_str: 1) names
754 * of ciphers themselves 2) aliases for groups of ciphers.
755 * For 1) we need the available ciphers and for 2) the cipher
756 * groups of cipher_aliases added together in one list (otherwise
757 * we would be happy with just the cipher_aliases table).
758 */
759 num_of_group_aliases = sizeof(cipher_aliases) / sizeof(SSL_CIPHER);
760 num_of_alias_max = num_of_ciphers + num_of_group_aliases + 1;
761 ca_list =
762 (SSL_CIPHER **)OPENSSL_malloc(sizeof(SSL_CIPHER *) * num_of_alias_max);
763 if (ca_list == NULL)
764 {
765 OPENSSL_free(list);
766 SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE);
767 return(NULL); /* Failure */
768 }
769 ssl_cipher_collect_aliases(ca_list, num_of_group_aliases, disabled_mask,
770 head);
771
772 /*
773 * If the rule_string begins with DEFAULT, apply the default rule
774 * before using the (possibly available) additional rules.
775 */
776 ok = 1;
777 rule_p = rule_str;
778 if (strncmp(rule_str,"DEFAULT",7) == 0)
779 {
780 ok = ssl_cipher_process_rulestr(SSL_DEFAULT_CIPHER_LIST,
781 list, &head, &tail, ca_list);
782 rule_p += 7;
783 if (*rule_p == ':')
784 rule_p++;
785 }
786
787 if (ok && (strlen(rule_p) > 0))
788 ok = ssl_cipher_process_rulestr(rule_p, list, &head, &tail,
789 ca_list);
790
791 OPENSSL_free(ca_list); /* Not needed anymore */
792
793 if (!ok)
794 { /* Rule processing failure */
795 OPENSSL_free(list);
796 return(NULL);
797 }
798 /*
799 * Allocate new "cipherstack" for the result, return with error
800 * if we cannot get one.
801 */
802 if ((cipherstack = sk_SSL_CIPHER_new_null()) == NULL)
803 {
804 OPENSSL_free(list);
805 return(NULL);
806 }
807
808 /*
809 * The cipher selection for the list is done. The ciphers are added
810 * to the resulting precedence to the STACK_OF(SSL_CIPHER).
811 */
812 for (curr = head; curr != NULL; curr = curr->next)
813 {
814 if (curr->active)
815 {
816 sk_SSL_CIPHER_push(cipherstack, curr->cipher);
817#ifdef CIPHER_DEBUG
818 printf("<%s>\n",curr->cipher->name);
819#endif
820 }
821 }
822 OPENSSL_free(list); /* Not needed any longer */
823
824 /*
825 * The following passage is a little bit odd. If pointer variables
826 * were supplied to hold STACK_OF(SSL_CIPHER) return information,
827 * the old memory pointed to is free()ed. Then, however, the
828 * cipher_list entry will be assigned just a copy of the returned
829 * cipher stack. For cipher_list_by_id a copy of the cipher stack
830 * will be created. See next comment...
831 */
832 if (cipher_list != NULL)
833 {
834 if (*cipher_list != NULL)
835 sk_SSL_CIPHER_free(*cipher_list);
836 *cipher_list = cipherstack;
837 }
838
839 if (cipher_list_by_id != NULL)
840 {
841 if (*cipher_list_by_id != NULL)
842 sk_SSL_CIPHER_free(*cipher_list_by_id);
843 *cipher_list_by_id = sk_SSL_CIPHER_dup(cipherstack);
844 }
845
846 /*
847 * Now it is getting really strange. If something failed during
848 * the previous pointer assignment or if one of the pointers was
849 * not requested, the error condition is met. That might be
850 * discussable. The strange thing is however that in this case
851 * the memory "ret" pointed to is "free()ed" and hence the pointer
852 * cipher_list becomes wild. The memory reserved for
853 * cipher_list_by_id however is not "free()ed" and stays intact.
854 */
855 if ( (cipher_list_by_id == NULL) ||
856 (*cipher_list_by_id == NULL) ||
857 (cipher_list == NULL) ||
858 (*cipher_list == NULL))
859 {
860 sk_SSL_CIPHER_free(cipherstack);
861 return(NULL);
862 }
863
864 sk_SSL_CIPHER_set_cmp_func(*cipher_list_by_id,ssl_cipher_ptr_id_cmp);
865
866 return(cipherstack);
867 }
868
869char *SSL_CIPHER_description(SSL_CIPHER *cipher, char *buf, int len)
870 {
871 int is_export,pkl,kl;
872 char *ver,*exp;
873 char *kx,*au,*enc,*mac;
874 unsigned long alg,alg2,alg_s;
875 static char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s\n";
876
877 alg=cipher->algorithms;
878 alg_s=cipher->algo_strength;
879 alg2=cipher->algorithm2;
880
881 is_export=SSL_C_IS_EXPORT(cipher);
882 pkl=SSL_C_EXPORT_PKEYLENGTH(cipher);
883 kl=SSL_C_EXPORT_KEYLENGTH(cipher);
884 exp=is_export?" export":"";
885
886 if (alg & SSL_SSLV2)
887 ver="SSLv2";
888 else if (alg & SSL_SSLV3)
889 ver="SSLv3";
890 else
891 ver="unknown";
892
893 switch (alg&SSL_MKEY_MASK)
894 {
895 case SSL_kRSA:
896 kx=is_export?(pkl == 512 ? "RSA(512)" : "RSA(1024)"):"RSA";
897 break;
898 case SSL_kDHr:
899 kx="DH/RSA";
900 break;
901 case SSL_kDHd:
902 kx="DH/DSS";
903 break;
904 case SSL_kFZA:
905 kx="Fortezza";
906 break;
907 case SSL_kEDH:
908 kx=is_export?(pkl == 512 ? "DH(512)" : "DH(1024)"):"DH";
909 break;
910 default:
911 kx="unknown";
912 }
913
914 switch (alg&SSL_AUTH_MASK)
915 {
916 case SSL_aRSA:
917 au="RSA";
918 break;
919 case SSL_aDSS:
920 au="DSS";
921 break;
922 case SSL_aDH:
923 au="DH";
924 break;
925 case SSL_aFZA:
926 case SSL_aNULL:
927 au="None";
928 break;
929 default:
930 au="unknown";
931 break;
932 }
933
934 switch (alg&SSL_ENC_MASK)
935 {
936 case SSL_DES:
937 enc=(is_export && kl == 5)?"DES(40)":"DES(56)";
938 break;
939 case SSL_3DES:
940 enc="3DES(168)";
941 break;
942 case SSL_RC4:
943 enc=is_export?(kl == 5 ? "RC4(40)" : "RC4(56)")
944 :((alg2&SSL2_CF_8_BYTE_ENC)?"RC4(64)":"RC4(128)");
945 break;
946 case SSL_RC2:
947 enc=is_export?(kl == 5 ? "RC2(40)" : "RC2(56)"):"RC2(128)";
948 break;
949 case SSL_IDEA:
950 enc="IDEA(128)";
951 break;
952 case SSL_eFZA:
953 enc="Fortezza";
954 break;
955 case SSL_eNULL:
956 enc="None";
957 break;
958 default:
959 enc="unknown";
960 break;
961 }
962
963 switch (alg&SSL_MAC_MASK)
964 {
965 case SSL_MD5:
966 mac="MD5";
967 break;
968 case SSL_SHA1:
969 mac="SHA1";
970 break;
971 default:
972 mac="unknown";
973 break;
974 }
975
976 if (buf == NULL)
977 {
978 len=128;
979 buf=OPENSSL_malloc(len);
980 if (buf == NULL) return("OPENSSL_malloc Error");
981 }
982 else if (len < 128)
983 return("Buffer too small");
984
985 BIO_snprintf(buf,len,format,cipher->name,ver,kx,au,enc,mac,exp);
986 return(buf);
987 }
988
989char *SSL_CIPHER_get_version(SSL_CIPHER *c)
990 {
991 int i;
992
993 if (c == NULL) return("(NONE)");
994 i=(int)(c->id>>24L);
995 if (i == 3)
996 return("TLSv1/SSLv3");
997 else if (i == 2)
998 return("SSLv2");
999 else
1000 return("unknown");
1001 }
1002
1003/* return the actual cipher being used */
1004const char *SSL_CIPHER_get_name(SSL_CIPHER *c)
1005 {
1006 if (c != NULL)
1007 return(c->name);
1008 return("(NONE)");
1009 }
1010
1011/* number of bits for symmetric cipher */
1012int SSL_CIPHER_get_bits(SSL_CIPHER *c, int *alg_bits)
1013 {
1014 int ret=0;
1015
1016 if (c != NULL)
1017 {
1018 if (alg_bits != NULL) *alg_bits = c->alg_bits;
1019 ret = c->strength_bits;
1020 }
1021 return(ret);
1022 }
1023
1024SSL_COMP *ssl3_comp_find(STACK_OF(SSL_COMP) *sk, int n)
1025 {
1026 SSL_COMP *ctmp;
1027 int i,nn;
1028
1029 if ((n == 0) || (sk == NULL)) return(NULL);
1030 nn=sk_SSL_COMP_num(sk);
1031 for (i=0; i<nn; i++)
1032 {
1033 ctmp=sk_SSL_COMP_value(sk,i);
1034 if (ctmp->id == n)
1035 return(ctmp);
1036 }
1037 return(NULL);
1038 }
1039
1040static int sk_comp_cmp(const SSL_COMP * const *a,
1041 const SSL_COMP * const *b)
1042 {
1043 return((*a)->id-(*b)->id);
1044 }
1045
1046STACK_OF(SSL_COMP) *SSL_COMP_get_compression_methods(void)
1047 {
1048 return(ssl_comp_methods);
1049 }
1050
1051int SSL_COMP_add_compression_method(int id, COMP_METHOD *cm)
1052 {
1053 SSL_COMP *comp;
1054 STACK_OF(SSL_COMP) *sk;
1055
1056 comp=(SSL_COMP *)OPENSSL_malloc(sizeof(SSL_COMP));
1057 comp->id=id;
1058 comp->method=cm;
1059 if (ssl_comp_methods == NULL)
1060 sk=ssl_comp_methods=sk_SSL_COMP_new(sk_comp_cmp);
1061 else
1062 sk=ssl_comp_methods;
1063 if ((sk == NULL) || !sk_SSL_COMP_push(sk,comp))
1064 {
1065 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,ERR_R_MALLOC_FAILURE);
1066 return(0);
1067 }
1068 else
1069 return(1);
1070 }
1071
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