1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
|
/* ssl/ssl_ciph.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
#include <stdio.h>
#include <openssl/objects.h>
#include <openssl/comp.h>
#include "ssl_locl.h"
#define SSL_ENC_DES_IDX 0
#define SSL_ENC_3DES_IDX 1
#define SSL_ENC_RC4_IDX 2
#define SSL_ENC_RC2_IDX 3
#define SSL_ENC_IDEA_IDX 4
#define SSL_ENC_eFZA_IDX 5
#define SSL_ENC_NULL_IDX 6
#define SSL_ENC_NUM_IDX 7
static const EVP_CIPHER *ssl_cipher_methods[SSL_ENC_NUM_IDX]={
NULL,NULL,NULL,NULL,NULL,NULL,
};
static STACK_OF(SSL_COMP) *ssl_comp_methods=NULL;
#define SSL_MD_MD5_IDX 0
#define SSL_MD_SHA1_IDX 1
#define SSL_MD_NUM_IDX 2
static const EVP_MD *ssl_digest_methods[SSL_MD_NUM_IDX]={
NULL,NULL,
};
#define CIPHER_ADD 1
#define CIPHER_KILL 2
#define CIPHER_DEL 3
#define CIPHER_ORD 4
#define CIPHER_SPECIAL 5
typedef struct cipher_order_st
{
SSL_CIPHER *cipher;
int active;
int dead;
struct cipher_order_st *next,*prev;
} CIPHER_ORDER;
static const SSL_CIPHER cipher_aliases[]={
/* Don't include eNULL unless specifically enabled */
{0,SSL_TXT_ALL, 0,SSL_ALL & ~SSL_eNULL, SSL_ALL ,0,0,0,SSL_ALL,SSL_ALL}, /* must be first */
{0,SSL_TXT_kRSA,0,SSL_kRSA, 0,0,0,0,SSL_MKEY_MASK,0},
{0,SSL_TXT_kDHr,0,SSL_kDHr, 0,0,0,0,SSL_MKEY_MASK,0},
{0,SSL_TXT_kDHd,0,SSL_kDHd, 0,0,0,0,SSL_MKEY_MASK,0},
{0,SSL_TXT_kEDH,0,SSL_kEDH, 0,0,0,0,SSL_MKEY_MASK,0},
{0,SSL_TXT_kFZA,0,SSL_kFZA, 0,0,0,0,SSL_MKEY_MASK,0},
{0,SSL_TXT_DH, 0,SSL_DH, 0,0,0,0,SSL_MKEY_MASK,0},
{0,SSL_TXT_EDH, 0,SSL_EDH, 0,0,0,0,SSL_MKEY_MASK|SSL_AUTH_MASK,0},
{0,SSL_TXT_aRSA,0,SSL_aRSA, 0,0,0,0,SSL_AUTH_MASK,0},
{0,SSL_TXT_aDSS,0,SSL_aDSS, 0,0,0,0,SSL_AUTH_MASK,0},
{0,SSL_TXT_aFZA,0,SSL_aFZA, 0,0,0,0,SSL_AUTH_MASK,0},
{0,SSL_TXT_aNULL,0,SSL_aNULL,0,0,0,0,SSL_AUTH_MASK,0},
{0,SSL_TXT_aDH, 0,SSL_aDH, 0,0,0,0,SSL_AUTH_MASK,0},
{0,SSL_TXT_DSS, 0,SSL_DSS, 0,0,0,0,SSL_AUTH_MASK,0},
{0,SSL_TXT_DES, 0,SSL_DES, 0,0,0,0,SSL_ENC_MASK,0},
{0,SSL_TXT_3DES,0,SSL_3DES, 0,0,0,0,SSL_ENC_MASK,0},
{0,SSL_TXT_RC4, 0,SSL_RC4, 0,0,0,0,SSL_ENC_MASK,0},
{0,SSL_TXT_RC2, 0,SSL_RC2, 0,0,0,0,SSL_ENC_MASK,0},
{0,SSL_TXT_IDEA,0,SSL_IDEA, 0,0,0,0,SSL_ENC_MASK,0},
{0,SSL_TXT_eNULL,0,SSL_eNULL,0,0,0,0,SSL_ENC_MASK,0},
{0,SSL_TXT_eFZA,0,SSL_eFZA, 0,0,0,0,SSL_ENC_MASK,0},
{0,SSL_TXT_MD5, 0,SSL_MD5, 0,0,0,0,SSL_MAC_MASK,0},
{0,SSL_TXT_SHA1,0,SSL_SHA1, 0,0,0,0,SSL_MAC_MASK,0},
{0,SSL_TXT_SHA, 0,SSL_SHA, 0,0,0,0,SSL_MAC_MASK,0},
{0,SSL_TXT_NULL,0,SSL_NULL, 0,0,0,0,SSL_ENC_MASK,0},
{0,SSL_TXT_RSA, 0,SSL_RSA, 0,0,0,0,SSL_AUTH_MASK|SSL_MKEY_MASK,0},
{0,SSL_TXT_ADH, 0,SSL_ADH, 0,0,0,0,SSL_AUTH_MASK|SSL_MKEY_MASK,0},
{0,SSL_TXT_FZA, 0,SSL_FZA, 0,0,0,0,SSL_AUTH_MASK|SSL_MKEY_MASK|SSL_ENC_MASK,0},
{0,SSL_TXT_SSLV2, 0,SSL_SSLV2, 0,0,0,0,SSL_SSL_MASK,0},
{0,SSL_TXT_SSLV3, 0,SSL_SSLV3, 0,0,0,0,SSL_SSL_MASK,0},
{0,SSL_TXT_TLSV1, 0,SSL_TLSV1, 0,0,0,0,SSL_SSL_MASK,0},
{0,SSL_TXT_EXP ,0, 0,SSL_EXPORT, 0,0,0,0,SSL_EXP_MASK},
{0,SSL_TXT_EXPORT,0, 0,SSL_EXPORT, 0,0,0,0,SSL_EXP_MASK},
{0,SSL_TXT_EXP40, 0, 0, SSL_EXP40, 0,0,0,0,SSL_STRONG_MASK},
{0,SSL_TXT_EXP56, 0, 0, SSL_EXP56, 0,0,0,0,SSL_STRONG_MASK},
{0,SSL_TXT_LOW, 0, 0, SSL_LOW, 0,0,0,0,SSL_STRONG_MASK},
{0,SSL_TXT_MEDIUM,0, 0,SSL_MEDIUM, 0,0,0,0,SSL_STRONG_MASK},
{0,SSL_TXT_HIGH, 0, 0, SSL_HIGH, 0,0,0,0,SSL_STRONG_MASK},
};
static int init_ciphers=1;
static void load_ciphers(void)
{
init_ciphers=0;
ssl_cipher_methods[SSL_ENC_DES_IDX]=
EVP_get_cipherbyname(SN_des_cbc);
ssl_cipher_methods[SSL_ENC_3DES_IDX]=
EVP_get_cipherbyname(SN_des_ede3_cbc);
ssl_cipher_methods[SSL_ENC_RC4_IDX]=
EVP_get_cipherbyname(SN_rc4);
ssl_cipher_methods[SSL_ENC_RC2_IDX]=
EVP_get_cipherbyname(SN_rc2_cbc);
ssl_cipher_methods[SSL_ENC_IDEA_IDX]=
EVP_get_cipherbyname(SN_idea_cbc);
ssl_digest_methods[SSL_MD_MD5_IDX]=
EVP_get_digestbyname(SN_md5);
ssl_digest_methods[SSL_MD_SHA1_IDX]=
EVP_get_digestbyname(SN_sha1);
}
int ssl_cipher_get_evp(SSL_SESSION *s, const EVP_CIPHER **enc,
const EVP_MD **md, SSL_COMP **comp)
{
int i;
SSL_CIPHER *c;
c=s->cipher;
if (c == NULL) return(0);
if (comp != NULL)
{
SSL_COMP ctmp;
if (s->compress_meth == 0)
*comp=NULL;
else if (ssl_comp_methods == NULL)
{
/* bad */
*comp=NULL;
}
else
{
ctmp.id=s->compress_meth;
i=sk_SSL_COMP_find(ssl_comp_methods,&ctmp);
if (i >= 0)
*comp=sk_SSL_COMP_value(ssl_comp_methods,i);
else
*comp=NULL;
}
}
if ((enc == NULL) || (md == NULL)) return(0);
switch (c->algorithms & SSL_ENC_MASK)
{
case SSL_DES:
i=SSL_ENC_DES_IDX;
break;
case SSL_3DES:
i=SSL_ENC_3DES_IDX;
break;
case SSL_RC4:
i=SSL_ENC_RC4_IDX;
break;
case SSL_RC2:
i=SSL_ENC_RC2_IDX;
break;
case SSL_IDEA:
i=SSL_ENC_IDEA_IDX;
break;
case SSL_eNULL:
i=SSL_ENC_NULL_IDX;
break;
default:
i= -1;
break;
}
if ((i < 0) || (i > SSL_ENC_NUM_IDX))
*enc=NULL;
else
{
if (i == SSL_ENC_NULL_IDX)
*enc=EVP_enc_null();
else
*enc=ssl_cipher_methods[i];
}
switch (c->algorithms & SSL_MAC_MASK)
{
case SSL_MD5:
i=SSL_MD_MD5_IDX;
break;
case SSL_SHA1:
i=SSL_MD_SHA1_IDX;
break;
default:
i= -1;
break;
}
if ((i < 0) || (i > SSL_MD_NUM_IDX))
*md=NULL;
else
*md=ssl_digest_methods[i];
if ((*enc != NULL) && (*md != NULL))
return(1);
else
return(0);
}
#define ITEM_SEP(a) \
(((a) == ':') || ((a) == ' ') || ((a) == ';') || ((a) == ','))
static void ll_append_tail(CIPHER_ORDER **head, CIPHER_ORDER *curr,
CIPHER_ORDER **tail)
{
if (curr == *tail) return;
if (curr == *head)
*head=curr->next;
if (curr->prev != NULL)
curr->prev->next=curr->next;
if (curr->next != NULL) /* should always be true */
curr->next->prev=curr->prev;
(*tail)->next=curr;
curr->prev= *tail;
curr->next=NULL;
*tail=curr;
}
static unsigned long ssl_cipher_get_disabled(void)
{
unsigned long mask;
mask = SSL_kFZA;
#ifdef NO_RSA
mask |= SSL_aRSA|SSL_kRSA;
#endif
#ifdef NO_DSA
mask |= SSL_aDSS;
#endif
#ifdef NO_DH
mask |= SSL_kDHr|SSL_kDHd|SSL_kEDH|SSL_aDH;
#endif
#ifdef SSL_FORBID_ENULL
mask |= SSL_eNULL;
#endif
mask |= (ssl_cipher_methods[SSL_ENC_DES_IDX ] == NULL) ? SSL_DES :0;
mask |= (ssl_cipher_methods[SSL_ENC_3DES_IDX] == NULL) ? SSL_3DES:0;
mask |= (ssl_cipher_methods[SSL_ENC_RC4_IDX ] == NULL) ? SSL_RC4 :0;
mask |= (ssl_cipher_methods[SSL_ENC_RC2_IDX ] == NULL) ? SSL_RC2 :0;
mask |= (ssl_cipher_methods[SSL_ENC_IDEA_IDX] == NULL) ? SSL_IDEA:0;
mask |= (ssl_cipher_methods[SSL_ENC_eFZA_IDX] == NULL) ? SSL_eFZA:0;
mask |= (ssl_digest_methods[SSL_MD_MD5_IDX ] == NULL) ? SSL_MD5 :0;
mask |= (ssl_digest_methods[SSL_MD_SHA1_IDX] == NULL) ? SSL_SHA1:0;
return(mask);
}
static void ssl_cipher_collect_ciphers(const SSL_METHOD *ssl_method,
int num_of_ciphers, unsigned long mask, CIPHER_ORDER *list,
CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
{
int i, list_num;
SSL_CIPHER *c;
/*
* We have num_of_ciphers descriptions compiled in, depending on the
* method selected (SSLv2 and/or SSLv3, TLSv1 etc).
* These will later be sorted in a linked list with at most num
* entries.
*/
/* Get the initial list of ciphers */
list_num = 0; /* actual count of ciphers */
for (i = 0; i < num_of_ciphers; i++)
{
c = ssl_method->get_cipher(i);
/* drop those that use any of that is not available */
if ((c != NULL) && c->valid && !(c->algorithms & mask))
{
list[list_num].cipher = c;
list[list_num].next = NULL;
list[list_num].prev = NULL;
list[list_num].active = 0;
list_num++;
/*
if (!sk_push(ca_list,(char *)c)) goto err;
*/
}
}
/*
* Prepare linked list from list entries
*/
for (i = 1; i < list_num - 1; i++)
{
list[i].prev = &(list[i-1]);
list[i].next = &(list[i+1]);
}
if (list_num > 0)
{
(*head_p) = &(list[0]);
(*head_p)->prev = NULL;
(*head_p)->next = &(list[1]);
(*tail_p) = &(list[list_num - 1]);
(*tail_p)->prev = &(list[list_num - 2]);
(*tail_p)->next = NULL;
}
}
static void ssl_cipher_collect_aliases(SSL_CIPHER **ca_list,
int num_of_group_aliases, unsigned long mask,
CIPHER_ORDER *head)
{
CIPHER_ORDER *ciph_curr;
SSL_CIPHER **ca_curr;
int i;
/*
* First, add the real ciphers as already collected
*/
ciph_curr = head;
ca_curr = ca_list;
while (ciph_curr != NULL)
{
*ca_curr = ciph_curr->cipher;
ca_curr++;
ciph_curr = ciph_curr->next;
}
/*
* Now we add the available ones from the cipher_aliases[] table.
* They represent either an algorithm, that must be fully
* supported (not match any bit in mask) or represent a cipher
* strength value (will be added in any case because algorithms=0).
*/
for (i = 0; i < num_of_group_aliases; i++)
{
if ((i == 0) || /* always fetch "ALL" */
!(cipher_aliases[i].algorithms & mask))
{
*ca_curr = (SSL_CIPHER *)(cipher_aliases + i);
ca_curr++;
}
}
*ca_curr = NULL; /* end of list */
}
static void ssl_cipher_apply_rule(unsigned long algorithms, unsigned long mask,
unsigned long algo_strength, unsigned long mask_strength,
int rule, int strength_bits, CIPHER_ORDER *list,
CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
{
CIPHER_ORDER *head, *tail, *curr, *curr2, *tail2;
SSL_CIPHER *cp;
unsigned long ma, ma_s;
#ifdef CIPHER_DEBUG
printf("Applying rule %d with %08lx %08lx %08lx %08lx (%d)\n",
rule, algorithms, mask, algo_strength, mask_strength,
strength_bits);
#endif
curr = head = *head_p;
curr2 = head;
tail2 = tail = *tail_p;
for (;;)
{
if ((curr == NULL) || (curr == tail2)) break;
curr = curr2;
curr2 = curr->next;
cp = curr->cipher;
/*
* Selection criteria is either the number of strength_bits
* or the algorithm used.
*/
if (strength_bits == -1)
{
ma = mask & cp->algorithms;
ma_s = mask_strength & cp->algo_strength;
#ifdef CIPHER_DEBUG
printf("\nName: %s:\nAlgo = %08lx Algo_strength = %08lx\nMask = %08lx Mask_strength %08lx\n", cp->name, cp->algorithms, cp->algo_strength, mask, mask_strength);
printf("ma = %08lx ma_s %08lx, ma&algo=%08lx, ma_s&algos=%08lx\n", ma, ma_s, ma&algorithms, ma_s&algo_strength);
#endif
/*
* Select: if none of the mask bit was met from the
* cipher or not all of the bits were met, the
* selection does not apply.
*/
if (((ma == 0) && (ma_s == 0)) ||
((ma & algorithms) != ma) ||
((ma_s & algo_strength) != ma_s))
continue; /* does not apply */
}
else if (strength_bits != cp->strength_bits)
continue; /* does not apply */
#ifdef CIPHER_DEBUG
printf("Action = %d\n", rule);
#endif
/* add the cipher if it has not been added yet. */
if (rule == CIPHER_ADD)
{
if (!curr->active)
{
ll_append_tail(&head, curr, &tail);
curr->active = 1;
}
}
/* Move the added cipher to this location */
else if (rule == CIPHER_ORD)
{
if (curr->active)
{
ll_append_tail(&head, curr, &tail);
}
}
else if (rule == CIPHER_DEL)
curr->active = 0;
else if (rule == CIPHER_KILL)
{
if (head == curr)
head = curr->next;
else
curr->prev->next = curr->next;
if (tail == curr)
tail = curr->prev;
curr->active = 0;
if (curr->next != NULL)
curr->next->prev = curr->prev;
if (curr->prev != NULL)
curr->prev->next = curr->next;
curr->next = NULL;
curr->prev = NULL;
}
}
*head_p = head;
*tail_p = tail;
}
static int ssl_cipher_strength_sort(CIPHER_ORDER *list, CIPHER_ORDER **head_p,
CIPHER_ORDER **tail_p)
{
int max_strength_bits, i, *number_uses;
CIPHER_ORDER *curr;
/*
* This routine sorts the ciphers with descending strength. The sorting
* must keep the pre-sorted sequence, so we apply the normal sorting
* routine as '+' movement to the end of the list.
*/
max_strength_bits = 0;
curr = *head_p;
while (curr != NULL)
{
if (curr->active &&
(curr->cipher->strength_bits > max_strength_bits))
max_strength_bits = curr->cipher->strength_bits;
curr = curr->next;
}
number_uses = OPENSSL_malloc((max_strength_bits + 1) * sizeof(int));
if (!number_uses)
{
SSLerr(SSL_F_SSL_CIPHER_STRENGTH_SORT,ERR_R_MALLOC_FAILURE);
return(0);
}
memset(number_uses, 0, (max_strength_bits + 1) * sizeof(int));
/*
* Now find the strength_bits values actually used
*/
curr = *head_p;
while (curr != NULL)
{
if (curr->active)
number_uses[curr->cipher->strength_bits]++;
curr = curr->next;
}
/*
* Go through the list of used strength_bits values in descending
* order.
*/
for (i = max_strength_bits; i >= 0; i--)
if (number_uses[i] > 0)
ssl_cipher_apply_rule(0, 0, 0, 0, CIPHER_ORD, i,
list, head_p, tail_p);
OPENSSL_free(number_uses);
return(1);
}
static int ssl_cipher_process_rulestr(const char *rule_str,
CIPHER_ORDER *list, CIPHER_ORDER **head_p,
CIPHER_ORDER **tail_p, SSL_CIPHER **ca_list)
{
unsigned long algorithms, mask, algo_strength, mask_strength;
const char *l, *start, *buf;
int j, multi, found, rule, retval, ok, buflen;
char ch;
retval = 1;
l = rule_str;
for (;;)
{
ch = *l;
if (ch == '\0')
break; /* done */
if (ch == '-')
{ rule = CIPHER_DEL; l++; }
else if (ch == '+')
{ rule = CIPHER_ORD; l++; }
else if (ch == '!')
{ rule = CIPHER_KILL; l++; }
else if (ch == '@')
{ rule = CIPHER_SPECIAL; l++; }
else
{ rule = CIPHER_ADD; }
if (ITEM_SEP(ch))
{
l++;
continue;
}
algorithms = mask = algo_strength = mask_strength = 0;
start=l;
for (;;)
{
ch = *l;
buf = l;
buflen = 0;
#ifndef CHARSET_EBCDIC
while ( ((ch >= 'A') && (ch <= 'Z')) ||
((ch >= '0') && (ch <= '9')) ||
((ch >= 'a') && (ch <= 'z')) ||
(ch == '-'))
#else
while ( isalnum(ch) || (ch == '-'))
#endif
{
ch = *(++l);
buflen++;
}
if (buflen == 0)
{
/*
* We hit something we cannot deal with,
* it is no command or separator nor
* alphanumeric, so we call this an error.
*/
SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR,
SSL_R_INVALID_COMMAND);
retval = found = 0;
l++;
break;
}
if (rule == CIPHER_SPECIAL)
{
found = 0; /* unused -- avoid compiler warning */
break; /* special treatment */
}
/* check for multi-part specification */
if (ch == '+')
{
multi=1;
l++;
}
else
multi=0;
/*
* Now search for the cipher alias in the ca_list. Be careful
* with the strncmp, because the "buflen" limitation
* will make the rule "ADH:SOME" and the cipher
* "ADH-MY-CIPHER" look like a match for buflen=3.
* So additionally check whether the cipher name found
* has the correct length. We can save a strlen() call:
* just checking for the '\0' at the right place is
* sufficient, we have to strncmp() anyway.
*/
j = found = 0;
while (ca_list[j])
{
if ((ca_list[j]->name[buflen] == '\0') &&
!strncmp(buf, ca_list[j]->name, buflen))
{
found = 1;
break;
}
else
j++;
}
if (!found)
break; /* ignore this entry */
algorithms |= ca_list[j]->algorithms;
mask |= ca_list[j]->mask;
algo_strength |= ca_list[j]->algo_strength;
mask_strength |= ca_list[j]->mask_strength;
if (!multi) break;
}
/*
* Ok, we have the rule, now apply it
*/
if (rule == CIPHER_SPECIAL)
{ /* special command */
ok = 0;
if ((buflen == 8) &&
!strncmp(buf, "STRENGTH", 8))
ok = ssl_cipher_strength_sort(list,
head_p, tail_p);
else
SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR,
SSL_R_INVALID_COMMAND);
if (ok == 0)
retval = 0;
/*
* We do not support any "multi" options
* together with "@", so throw away the
* rest of the command, if any left, until
* end or ':' is found.
*/
while ((*l != '\0') && ITEM_SEP(*l))
l++;
}
else if (found)
{
ssl_cipher_apply_rule(algorithms, mask,
algo_strength, mask_strength, rule, -1,
list, head_p, tail_p);
}
else
{
while ((*l != '\0') && ITEM_SEP(*l))
l++;
}
if (*l == '\0') break; /* done */
}
return(retval);
}
STACK_OF(SSL_CIPHER) *ssl_create_cipher_list(const SSL_METHOD *ssl_method,
STACK_OF(SSL_CIPHER) **cipher_list,
STACK_OF(SSL_CIPHER) **cipher_list_by_id,
const char *rule_str)
{
int ok, num_of_ciphers, num_of_alias_max, num_of_group_aliases;
unsigned long disabled_mask;
STACK_OF(SSL_CIPHER) *cipherstack;
const char *rule_p;
CIPHER_ORDER *list = NULL, *head = NULL, *tail = NULL, *curr;
SSL_CIPHER **ca_list = NULL;
/*
* Return with error if nothing to do.
*/
if (rule_str == NULL) return(NULL);
if (init_ciphers) load_ciphers();
/*
* To reduce the work to do we only want to process the compiled
* in algorithms, so we first get the mask of disabled ciphers.
*/
disabled_mask = ssl_cipher_get_disabled();
/*
* Now we have to collect the available ciphers from the compiled
* in ciphers. We cannot get more than the number compiled in, so
* it is used for allocation.
*/
num_of_ciphers = ssl_method->num_ciphers();
list = (CIPHER_ORDER *)OPENSSL_malloc(sizeof(CIPHER_ORDER) * num_of_ciphers);
if (list == NULL)
{
SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE);
return(NULL); /* Failure */
}
ssl_cipher_collect_ciphers(ssl_method, num_of_ciphers, disabled_mask,
list, &head, &tail);
/*
* We also need cipher aliases for selecting based on the rule_str.
* There might be two types of entries in the rule_str: 1) names
* of ciphers themselves 2) aliases for groups of ciphers.
* For 1) we need the available ciphers and for 2) the cipher
* groups of cipher_aliases added together in one list (otherwise
* we would be happy with just the cipher_aliases table).
*/
num_of_group_aliases = sizeof(cipher_aliases) / sizeof(SSL_CIPHER);
num_of_alias_max = num_of_ciphers + num_of_group_aliases + 1;
ca_list =
(SSL_CIPHER **)OPENSSL_malloc(sizeof(SSL_CIPHER *) * num_of_alias_max);
if (ca_list == NULL)
{
OPENSSL_free(list);
SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE);
return(NULL); /* Failure */
}
ssl_cipher_collect_aliases(ca_list, num_of_group_aliases, disabled_mask,
head);
/*
* If the rule_string begins with DEFAULT, apply the default rule
* before using the (possibly available) additional rules.
*/
ok = 1;
rule_p = rule_str;
if (strncmp(rule_str,"DEFAULT",7) == 0)
{
ok = ssl_cipher_process_rulestr(SSL_DEFAULT_CIPHER_LIST,
list, &head, &tail, ca_list);
rule_p += 7;
if (*rule_p == ':')
rule_p++;
}
if (ok && (strlen(rule_p) > 0))
ok = ssl_cipher_process_rulestr(rule_p, list, &head, &tail,
ca_list);
OPENSSL_free(ca_list); /* Not needed anymore */
if (!ok)
{ /* Rule processing failure */
OPENSSL_free(list);
return(NULL);
}
/*
* Allocate new "cipherstack" for the result, return with error
* if we cannot get one.
*/
if ((cipherstack = sk_SSL_CIPHER_new_null()) == NULL)
{
OPENSSL_free(list);
return(NULL);
}
/*
* The cipher selection for the list is done. The ciphers are added
* to the resulting precedence to the STACK_OF(SSL_CIPHER).
*/
for (curr = head; curr != NULL; curr = curr->next)
{
if (curr->active)
{
sk_SSL_CIPHER_push(cipherstack, curr->cipher);
#ifdef CIPHER_DEBUG
printf("<%s>\n",curr->cipher->name);
#endif
}
}
OPENSSL_free(list); /* Not needed any longer */
/*
* The following passage is a little bit odd. If pointer variables
* were supplied to hold STACK_OF(SSL_CIPHER) return information,
* the old memory pointed to is free()ed. Then, however, the
* cipher_list entry will be assigned just a copy of the returned
* cipher stack. For cipher_list_by_id a copy of the cipher stack
* will be created. See next comment...
*/
if (cipher_list != NULL)
{
if (*cipher_list != NULL)
sk_SSL_CIPHER_free(*cipher_list);
*cipher_list = cipherstack;
}
if (cipher_list_by_id != NULL)
{
if (*cipher_list_by_id != NULL)
sk_SSL_CIPHER_free(*cipher_list_by_id);
*cipher_list_by_id = sk_SSL_CIPHER_dup(cipherstack);
}
/*
* Now it is getting really strange. If something failed during
* the previous pointer assignment or if one of the pointers was
* not requested, the error condition is met. That might be
* discussable. The strange thing is however that in this case
* the memory "ret" pointed to is "free()ed" and hence the pointer
* cipher_list becomes wild. The memory reserved for
* cipher_list_by_id however is not "free()ed" and stays intact.
*/
if ( (cipher_list_by_id == NULL) ||
(*cipher_list_by_id == NULL) ||
(cipher_list == NULL) ||
(*cipher_list == NULL))
{
sk_SSL_CIPHER_free(cipherstack);
return(NULL);
}
sk_SSL_CIPHER_set_cmp_func(*cipher_list_by_id,ssl_cipher_ptr_id_cmp);
return(cipherstack);
}
char *SSL_CIPHER_description(SSL_CIPHER *cipher, char *buf, int len)
{
int is_export,pkl,kl;
char *ver,*exp;
char *kx,*au,*enc,*mac;
unsigned long alg,alg2,alg_s;
static char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s\n";
alg=cipher->algorithms;
alg_s=cipher->algo_strength;
alg2=cipher->algorithm2;
is_export=SSL_C_IS_EXPORT(cipher);
pkl=SSL_C_EXPORT_PKEYLENGTH(cipher);
kl=SSL_C_EXPORT_KEYLENGTH(cipher);
exp=is_export?" export":"";
if (alg & SSL_SSLV2)
ver="SSLv2";
else if (alg & SSL_SSLV3)
ver="SSLv3";
else
ver="unknown";
switch (alg&SSL_MKEY_MASK)
{
case SSL_kRSA:
kx=is_export?(pkl == 512 ? "RSA(512)" : "RSA(1024)"):"RSA";
break;
case SSL_kDHr:
kx="DH/RSA";
break;
case SSL_kDHd:
kx="DH/DSS";
break;
case SSL_kFZA:
kx="Fortezza";
break;
case SSL_kEDH:
kx=is_export?(pkl == 512 ? "DH(512)" : "DH(1024)"):"DH";
break;
default:
kx="unknown";
}
switch (alg&SSL_AUTH_MASK)
{
case SSL_aRSA:
au="RSA";
break;
case SSL_aDSS:
au="DSS";
break;
case SSL_aDH:
au="DH";
break;
case SSL_aFZA:
case SSL_aNULL:
au="None";
break;
default:
au="unknown";
break;
}
switch (alg&SSL_ENC_MASK)
{
case SSL_DES:
enc=(is_export && kl == 5)?"DES(40)":"DES(56)";
break;
case SSL_3DES:
enc="3DES(168)";
break;
case SSL_RC4:
enc=is_export?(kl == 5 ? "RC4(40)" : "RC4(56)")
:((alg2&SSL2_CF_8_BYTE_ENC)?"RC4(64)":"RC4(128)");
break;
case SSL_RC2:
enc=is_export?(kl == 5 ? "RC2(40)" : "RC2(56)"):"RC2(128)";
break;
case SSL_IDEA:
enc="IDEA(128)";
break;
case SSL_eFZA:
enc="Fortezza";
break;
case SSL_eNULL:
enc="None";
break;
default:
enc="unknown";
break;
}
switch (alg&SSL_MAC_MASK)
{
case SSL_MD5:
mac="MD5";
break;
case SSL_SHA1:
mac="SHA1";
break;
default:
mac="unknown";
break;
}
if (buf == NULL)
{
len=128;
buf=OPENSSL_malloc(len);
if (buf == NULL) return("OPENSSL_malloc Error");
}
else if (len < 128)
return("Buffer too small");
BIO_snprintf(buf,len,format,cipher->name,ver,kx,au,enc,mac,exp);
return(buf);
}
char *SSL_CIPHER_get_version(SSL_CIPHER *c)
{
int i;
if (c == NULL) return("(NONE)");
i=(int)(c->id>>24L);
if (i == 3)
return("TLSv1/SSLv3");
else if (i == 2)
return("SSLv2");
else
return("unknown");
}
/* return the actual cipher being used */
const char *SSL_CIPHER_get_name(SSL_CIPHER *c)
{
if (c != NULL)
return(c->name);
return("(NONE)");
}
/* number of bits for symmetric cipher */
int SSL_CIPHER_get_bits(SSL_CIPHER *c, int *alg_bits)
{
int ret=0;
if (c != NULL)
{
if (alg_bits != NULL) *alg_bits = c->alg_bits;
ret = c->strength_bits;
}
return(ret);
}
SSL_COMP *ssl3_comp_find(STACK_OF(SSL_COMP) *sk, int n)
{
SSL_COMP *ctmp;
int i,nn;
if ((n == 0) || (sk == NULL)) return(NULL);
nn=sk_SSL_COMP_num(sk);
for (i=0; i<nn; i++)
{
ctmp=sk_SSL_COMP_value(sk,i);
if (ctmp->id == n)
return(ctmp);
}
return(NULL);
}
static int sk_comp_cmp(const SSL_COMP * const *a,
const SSL_COMP * const *b)
{
return((*a)->id-(*b)->id);
}
STACK_OF(SSL_COMP) *SSL_COMP_get_compression_methods(void)
{
return(ssl_comp_methods);
}
int SSL_COMP_add_compression_method(int id, COMP_METHOD *cm)
{
SSL_COMP *comp;
STACK_OF(SSL_COMP) *sk;
MemCheck_off();
comp=(SSL_COMP *)OPENSSL_malloc(sizeof(SSL_COMP));
comp->id=id;
comp->method=cm;
if (ssl_comp_methods == NULL)
sk=ssl_comp_methods=sk_SSL_COMP_new(sk_comp_cmp);
else
sk=ssl_comp_methods;
if ((sk == NULL) || !sk_SSL_COMP_push(sk,comp))
{
MemCheck_on();
SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,ERR_R_MALLOC_FAILURE);
return(0);
}
else
{
MemCheck_on();
return(1);
}
}
|