ssl/ssl_ciph.c

   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 "objects.h"
  61 #include "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
  73 static const EVP_CIPHER *ssl_cipher_methods[SSL_ENC_NUM_IDX]={
  74         NULL,NULL,NULL,NULL,NULL,NULL,
  75         };
  76
  77 static 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
  82 static const EVP_MD *ssl_digest_methods[SSL_MD_NUM_IDX]={
  83         NULL,NULL,
  84         };
  85
  86 typedef struct cipher_sort_st
  87         {
  88         SSL_CIPHER *cipher;
  89         int pref;
  90         } CIPHER_SORT;
  91
  92 #define CIPHER_ADD      1
  93 #define CIPHER_KILL     2
  94 #define CIPHER_DEL      3
  95 #define CIPHER_ORD      4
  96
  97 typedef struct cipher_choice_st
  98         {
  99         int type;
 100         unsigned long algorithms;
 101         unsigned long mask;
 102         long top;
 103         } CIPHER_CHOICE;
 104
 105 typedef struct cipher_order_st
 106         {
 107         SSL_CIPHER *cipher;
 108         int active;
 109         int dead;
 110         struct cipher_order_st *next,*prev;
 111         } CIPHER_ORDER;
 112
 113 static SSL_CIPHER cipher_aliases[]={
 114         /* Don't include eNULL unless specifically enabled */
 115         {0,SSL_TXT_ALL, 0,SSL_ALL & ~SSL_eNULL, 0,SSL_ALL}, /* must be first */
 116         {0,SSL_TXT_kRSA,0,SSL_kRSA,  0,SSL_MKEY_MASK},
 117         {0,SSL_TXT_kDHr,0,SSL_kDHr,  0,SSL_MKEY_MASK},
 118         {0,SSL_TXT_kDHd,0,SSL_kDHd,  0,SSL_MKEY_MASK},
 119         {0,SSL_TXT_kEDH,0,SSL_kEDH,  0,SSL_MKEY_MASK},
 120         {0,SSL_TXT_kFZA,0,SSL_kFZA,  0,SSL_MKEY_MASK},
 121         {0,SSL_TXT_DH,  0,SSL_DH,    0,SSL_MKEY_MASK},
 122         {0,SSL_TXT_EDH, 0,SSL_EDH,   0,SSL_MKEY_MASK|SSL_AUTH_MASK},
 123
 124         {0,SSL_TXT_aRSA,0,SSL_aRSA,  0,SSL_AUTH_MASK},
 125         {0,SSL_TXT_aDSS,0,SSL_aDSS,  0,SSL_AUTH_MASK},
 126         {0,SSL_TXT_aFZA,0,SSL_aFZA,  0,SSL_AUTH_MASK},
 127         {0,SSL_TXT_aNULL,0,SSL_aNULL,0,SSL_AUTH_MASK},
 128         {0,SSL_TXT_aDH, 0,SSL_aDH,   0,SSL_AUTH_MASK},
 129         {0,SSL_TXT_DSS, 0,SSL_DSS,   0,SSL_AUTH_MASK},
 130
 131         {0,SSL_TXT_DES, 0,SSL_DES,   0,SSL_ENC_MASK},
 132         {0,SSL_TXT_3DES,0,SSL_3DES,  0,SSL_ENC_MASK},
 133         {0,SSL_TXT_RC4, 0,SSL_RC4,   0,SSL_ENC_MASK},
 134         {0,SSL_TXT_RC2, 0,SSL_RC2,   0,SSL_ENC_MASK},
 135         {0,SSL_TXT_IDEA,0,SSL_IDEA,  0,SSL_ENC_MASK},
 136         {0,SSL_TXT_eNULL,0,SSL_eNULL,0,SSL_ENC_MASK},
 137         {0,SSL_TXT_eFZA,0,SSL_eFZA,  0,SSL_ENC_MASK},
 138
 139         {0,SSL_TXT_MD5, 0,SSL_MD5,   0,SSL_MAC_MASK},
 140         {0,SSL_TXT_SHA1,0,SSL_SHA1,  0,SSL_MAC_MASK},
 141         {0,SSL_TXT_SHA, 0,SSL_SHA,   0,SSL_MAC_MASK},
 142
 143         {0,SSL_TXT_NULL,0,SSL_NULL,  0,SSL_ENC_MASK},
 144         {0,SSL_TXT_RSA, 0,SSL_RSA,   0,SSL_AUTH_MASK|SSL_MKEY_MASK},
 145         {0,SSL_TXT_ADH, 0,SSL_ADH,   0,SSL_AUTH_MASK|SSL_MKEY_MASK},
 146         {0,SSL_TXT_FZA, 0,SSL_FZA,   0,SSL_AUTH_MASK|SSL_MKEY_MASK|SSL_ENC_MASK},
 147
 148         {0,SSL_TXT_EXP40, 0,SSL_EXP40, 0,SSL_EXP_MASK},
 149         {0,SSL_TXT_EXPORT,0,SSL_EXP40, 0,SSL_EXP_MASK},
 150         {0,SSL_TXT_EXP56, 0,SSL_EXP56, 0,SSL_EXP_MASK},
 151         {0,SSL_TXT_SSLV2, 0,SSL_SSLV2, 0,SSL_SSL_MASK},
 152         {0,SSL_TXT_SSLV3, 0,SSL_SSLV3, 0,SSL_SSL_MASK},
 153         {0,SSL_TXT_TLSV1, 0,SSL_TLSV1, 0,SSL_SSL_MASK},
 154         {0,SSL_TXT_LOW,   0,SSL_LOW,   0,SSL_STRONG_MASK},
 155         {0,SSL_TXT_MEDIUM,0,SSL_MEDIUM,0,SSL_STRONG_MASK},
 156         {0,SSL_TXT_HIGH,  0,SSL_HIGH,  0,SSL_STRONG_MASK},
 157         };
 158
 159 static int init_ciphers=1;
 160 static void load_ciphers();
 161
 162 static int cmp_by_name(SSL_CIPHER **a, SSL_CIPHER **b)
 163         {
 164         return(strcmp((*a)->name,(*b)->name));
 165         }
 166
 167 static void load_ciphers(void)
 168         {
 169         init_ciphers=0;
 170         ssl_cipher_methods[SSL_ENC_DES_IDX]=
 171                 EVP_get_cipherbyname(SN_des_cbc);
 172         ssl_cipher_methods[SSL_ENC_3DES_IDX]=
 173                 EVP_get_cipherbyname(SN_des_ede3_cbc);
 174         ssl_cipher_methods[SSL_ENC_RC4_IDX]=
 175                 EVP_get_cipherbyname(SN_rc4);
 176         ssl_cipher_methods[SSL_ENC_RC2_IDX]=
 177                 EVP_get_cipherbyname(SN_rc2_cbc);
 178         ssl_cipher_methods[SSL_ENC_IDEA_IDX]=
 179                 EVP_get_cipherbyname(SN_idea_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
 187 int 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         default:
 241                 i= -1;
 242                 break;
 243                 }
 244
 245         if ((i < 0) || (i > SSL_ENC_NUM_IDX))
 246                 *enc=NULL;
 247         else
 248                 {
 249                 if (i == SSL_ENC_NULL_IDX)
 250                         *enc=EVP_enc_null();
 251                 else
 252                         *enc=ssl_cipher_methods[i];
 253                 }
 254
 255         switch (c->algorithms & SSL_MAC_MASK)
 256                 {
 257         case SSL_MD5:
 258                 i=SSL_MD_MD5_IDX;
 259                 break;
 260         case SSL_SHA1:
 261                 i=SSL_MD_SHA1_IDX;
 262                 break;
 263         default:
 264                 i= -1;
 265                 break;
 266                 }
 267         if ((i < 0) || (i > SSL_MD_NUM_IDX))
 268                 *md=NULL;
 269         else
 270                 *md=ssl_digest_methods[i];
 271
 272         if ((*enc != NULL) && (*md != NULL))
 273                 return(1);
 274         else
 275                 return(0);
 276         }
 277
 278 #define ITEM_SEP(a) \
 279         (((a) == ':') || ((a) == ' ') || ((a) == ';') || ((a) == ','))
 280
 281 static void ll_append_tail(CIPHER_ORDER **head, CIPHER_ORDER *curr,
 282              CIPHER_ORDER **tail)
 283         {
 284         if (curr == *tail) return;
 285         if (curr == *head)
 286                 *head=curr->next;
 287         if (curr->prev != NULL)
 288                 curr->prev->next=curr->next;
 289         if (curr->next != NULL) /* should always be true */
 290                 curr->next->prev=curr->prev;
 291         (*tail)->next=curr;
 292         curr->prev= *tail;
 293         curr->next=NULL;
 294         *tail=curr;
 295         }
 296
 297 STACK_OF(SSL_CIPHER) *ssl_create_cipher_list(SSL_METHOD *ssl_method,
 298                 STACK_OF(SSL_CIPHER) **cipher_list,
 299                 STACK_OF(SSL_CIPHER) **cipher_list_by_id,
 300                 char *str)
 301         {
 302         SSL_CIPHER *c;
 303         char *l;
 304         STACK_OF(SSL_CIPHER) *ret=NULL,*ok=NULL;
 305 #define CL_BUF  40
 306         char buf[CL_BUF];
 307         char *tmp_str=NULL;
 308         unsigned long mask,algorithms,ma;
 309         char *start;
 310         int i,j,k,num=0,ch,multi;
 311         unsigned long al;
 312         STACK *ca_list=NULL;
 313         int current_x,num_x;
 314         CIPHER_CHOICE *ops=NULL;
 315         CIPHER_ORDER *list=NULL,*head=NULL,*tail=NULL,*curr,*tail2,*curr2;
 316         int list_num;
 317         int type;
 318         SSL_CIPHER c_tmp,*cp;
 319
 320         if (str == NULL) return(NULL);
 321
 322         if (strncmp(str,"DEFAULT",7) == 0)
 323                 {
 324                 i=strlen(str)+2+strlen(SSL_DEFAULT_CIPHER_LIST);
 325                 if ((tmp_str=Malloc(i)) == NULL)
 326                         {
 327                         SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE);
 328                         goto err;
 329                         }
 330                 strcpy(tmp_str,SSL_DEFAULT_CIPHER_LIST);
 331                 strcat(tmp_str,":");
 332                 strcat(tmp_str,&(str[7]));
 333                 str=tmp_str;
 334                 }
 335         if (init_ciphers) load_ciphers();
 336
 337         num=ssl_method->num_ciphers();
 338
 339         if ((ret=sk_SSL_CIPHER_new(NULL)) == NULL) goto err;
 340         if ((ca_list=(STACK *)sk_new(cmp_by_name)) == NULL) goto err;
 341
 342         mask =SSL_kFZA;
 343 #ifdef NO_RSA
 344         mask|=SSL_aRSA|SSL_kRSA;
 345 #endif
 346 #ifdef NO_DSA
 347         mask|=SSL_aDSS;
 348 #endif
 349 #ifdef NO_DH
 350         mask|=SSL_kDHr|SSL_kDHd|SSL_kEDH|SSL_aDH;
 351 #endif
 352
 353 #ifdef SSL_FORBID_ENULL
 354         mask|=SSL_eNULL;
 355 #endif
 356
 357         mask|=(ssl_cipher_methods[SSL_ENC_DES_IDX ] == NULL)?SSL_DES :0;
 358         mask|=(ssl_cipher_methods[SSL_ENC_3DES_IDX] == NULL)?SSL_3DES:0;
 359         mask|=(ssl_cipher_methods[SSL_ENC_RC4_IDX ] == NULL)?SSL_RC4 :0;
 360         mask|=(ssl_cipher_methods[SSL_ENC_RC2_IDX ] == NULL)?SSL_RC2 :0;
 361         mask|=(ssl_cipher_methods[SSL_ENC_IDEA_IDX] == NULL)?SSL_IDEA:0;
 362         mask|=(ssl_cipher_methods[SSL_ENC_eFZA_IDX] == NULL)?SSL_eFZA:0;
 363
 364         mask|=(ssl_digest_methods[SSL_MD_MD5_IDX ] == NULL)?SSL_MD5 :0;
 365         mask|=(ssl_digest_methods[SSL_MD_SHA1_IDX] == NULL)?SSL_SHA1:0;
 366
 367         if ((list=(CIPHER_ORDER *)Malloc(sizeof(CIPHER_ORDER)*num)) == NULL)
 368                 goto err;
 369
 370         /* Get the initial list of ciphers */
 371         list_num=0;
 372         for (i=0; i<num; i++)
 373                 {
 374                 c=ssl_method->get_cipher((unsigned int)i);
 375                 /* drop those that use any of that is not available */
 376                 if ((c != NULL) && c->valid && !(c->algorithms & mask))
 377                         {
 378                         list[list_num].cipher=c;
 379                         list[list_num].next=NULL;
 380                         list[list_num].prev=NULL;
 381                         list[list_num].active=0;
 382                         list_num++;
 383                         if (!sk_push(ca_list,(char *)c)) goto err;
 384                         }
 385                 }
 386
 387         for (i=1; i<list_num-1; i++)
 388                 {
 389                 list[i].prev= &(list[i-1]);
 390                 list[i].next= &(list[i+1]);
 391                 }
 392         if (list_num > 0)
 393                 {
 394                 head= &(list[0]);
 395                 head->prev=NULL;
 396                 head->next= &(list[1]);
 397                 tail= &(list[list_num-1]);
 398                 tail->prev= &(list[list_num-2]);
 399                 tail->next=NULL;
 400                 }
 401
 402         /* special case */
 403         cipher_aliases[0].algorithms &= ~mask;
 404
 405         /* get the aliases */
 406         k=sizeof(cipher_aliases)/sizeof(SSL_CIPHER);
 407         for (j=0; j<k; j++)
 408                 {
 409                 al=cipher_aliases[j].algorithms;
 410                 /* Drop those that are not relevent */
 411                 if ((al & mask) == al) continue;
 412                 if (!sk_push(ca_list,(char *)&(cipher_aliases[j]))) goto err;
 413                 }
 414
 415         /* ca_list now holds a 'stack' of SSL_CIPHERS, some real, some
 416          * 'aliases' */
 417
 418         /* how many parameters are there? */
 419         num=1;
 420         for (l=str; *l; l++)
 421                 if (ITEM_SEP(*l))
 422                         num++;
 423         ops=(CIPHER_CHOICE *)Malloc(sizeof(CIPHER_CHOICE)*num);
 424         if (ops == NULL) goto err;
 425         memset(ops,0,sizeof(CIPHER_CHOICE)*num);
 426
 427         /* we now parse the input string and create our operations */
 428         l=str;
 429         i=0;
 430         current_x=0;
 431
 432         for (;;)
 433                 {
 434                 ch= *l;
 435
 436                 if (ch == '\0') break;
 437
 438                 if (ch == '-')
 439                         { j=CIPHER_DEL; l++; }
 440                 else if (ch == '+')
 441                         { j=CIPHER_ORD; l++; }
 442                 else if (ch == '!')
 443                         { j=CIPHER_KILL; l++; }
 444                 else
 445                         { j=CIPHER_ADD; }
 446
 447                 if (ITEM_SEP(ch))
 448                         {
 449                         l++;
 450                         continue;
 451                         }
 452                 ops[current_x].type=j;
 453                 ops[current_x].algorithms=0;
 454                 ops[current_x].mask=0;
 455
 456                 start=l;
 457                 for (;;)
 458                         {
 459                         ch= *l;
 460                         i=0;
 461                         while ( ((ch >= 'A') && (ch <= 'Z')) ||
 462                                 ((ch >= '0') && (ch <= '9')) ||
 463                                 ((ch >= 'a') && (ch <= 'z')) ||
 464                                  (ch == '-'))
 465                                  {
 466                                  buf[i]=ch;
 467                                  ch= *(++l);
 468                                  i++;
 469                                  if (i >= (CL_BUF-2)) break;
 470                                  }
 471                         buf[i]='\0';
 472
 473                         /* check for multi-part specification */
 474                         if (ch == '+')
 475                                 {
 476                                 multi=1;
 477                                 l++;
 478                                 }
 479                         else
 480                                 multi=0;
 481
 482                         c_tmp.name=buf;
 483                         j=sk_find(ca_list,(char *)&c_tmp);
 484                         if (j < 0)
 485                                 goto end_loop;
 486
 487                         cp=(SSL_CIPHER *)sk_value(ca_list,j);
 488                         ops[current_x].algorithms|=cp->algorithms;
 489                         /* We add the SSL_SSL_MASK so we can match the
 490                          * SSLv2 and SSLv3 versions of RC4-MD5 */
 491                         ops[current_x].mask|=cp->mask;
 492                         if (!multi) break;
 493                         }
 494                 current_x++;
 495                 if (ch == '\0') break;
 496 end_loop:
 497                 /* Make sure we scan until the next valid start point */
 498                 while ((*l != '\0') && ITEM_SEP(*l))
 499                         l++;
 500                 }
 501
 502         num_x=current_x;
 503         current_x=0;
 504
 505         /* We will now process the list of ciphers, once for each category, to
 506          * decide what we should do with it. */
 507         for (j=0; j<num_x; j++)
 508                 {
 509                 algorithms=ops[j].algorithms;
 510                 type=ops[j].type;
 511                 mask=ops[j].mask;
 512
 513                 curr=head;
 514                 curr2=head;
 515                 tail2=tail;
 516                 for (;;)
 517                         {
 518                         if ((curr == NULL) || (curr == tail2)) break;
 519                         curr=curr2;
 520                         curr2=curr->next;
 521
 522                         cp=curr->cipher;
 523                         ma=mask & cp->algorithms;
 524                         if ((ma == 0) || ((ma & algorithms) != ma))
 525                                 {
 526                                 /* does not apply */
 527                                 continue;
 528                                 }
 529
 530                         /* add the cipher if it has not been added yet. */
 531                         if (type == CIPHER_ADD)
 532                                 {
 533                                 if (!curr->active)
 534                                         {
 535                                         ll_append_tail(&head,curr,&tail);
 536                                         curr->active=1;
 537                                         }
 538                                 }
 539                         /* Move the added cipher to this location */
 540                         else if (type == CIPHER_ORD)
 541                                 {
 542                                 if (curr->active)
 543                                         {
 544                                         ll_append_tail(&head,curr,&tail);
 545                                         }
 546                                 }
 547                         else if (type == CIPHER_DEL)
 548                                 curr->active=0;
 549                         if (type == CIPHER_KILL)
 550                                 {
 551                                 if (head == curr)
 552                                         head=curr->next;
 553                                 else
 554                                         curr->prev->next=curr->next;
 555                                 if (tail == curr)
 556                                         tail=curr->prev;
 557                                 curr->active=0;
 558                                 if (curr->next != NULL)
 559                                         curr->next->prev=curr->prev;
 560                                 if (curr->prev != NULL)
 561                                         curr->prev->next=curr->next;
 562                                 curr->next=NULL;
 563                                 curr->prev=NULL;
 564                                 }
 565                         }
 566                 }
 567
 568         for (curr=head; curr != NULL; curr=curr->next)
 569                 {
 570                 if (curr->active)
 571                         {
 572                         sk_SSL_CIPHER_push(ret,curr->cipher);
 573 #ifdef CIPHER_DEBUG
 574                         printf("<%s>\n",curr->cipher->name);
 575 #endif
 576                         }
 577                 }
 578
 579         if (cipher_list != NULL)
 580                 {
 581                 if (*cipher_list != NULL)
 582                         sk_SSL_CIPHER_free(*cipher_list);
 583                 *cipher_list=ret;
 584                 }
 585
 586         if (cipher_list_by_id != NULL)
 587                 {
 588                 if (*cipher_list_by_id != NULL)
 589                         sk_SSL_CIPHER_free(*cipher_list_by_id);
 590                 *cipher_list_by_id=sk_SSL_CIPHER_dup(ret);
 591                 }
 592
 593         if (    (cipher_list_by_id == NULL) ||
 594                 (*cipher_list_by_id == NULL) ||
 595                 (cipher_list == NULL) ||
 596                 (*cipher_list == NULL))
 597                 goto err;
 598         sk_SSL_CIPHER_set_cmp_func(*cipher_list_by_id,ssl_cipher_ptr_id_cmp);
 599
 600         ok=ret;
 601         ret=NULL;
 602 err:
 603         if (tmp_str) Free(tmp_str);
 604         if (ops != NULL) Free(ops);
 605         if (ret != NULL) sk_SSL_CIPHER_free(ret);
 606         if (ca_list != NULL) sk_free(ca_list);
 607         if (list != NULL) Free(list);
 608         return(ok);
 609         }
 610
 611 char *SSL_CIPHER_description(SSL_CIPHER *cipher, char *buf, int len)
 612         {
 613         int is_export,pkl,kl;
 614         char *ver,*exp;
 615         char *kx,*au,*enc,*mac;
 616         unsigned long alg,alg2;
 617         static char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s\n";
 618
 619         alg=cipher->algorithms;
 620         alg2=cipher->algorithm2;
 621
 622         is_export=SSL_IS_EXPORT(alg);
 623         pkl=SSL_EXPORT_PKEYLENGTH(alg);
 624         kl=SSL_EXPORT_KEYLENGTH(alg);
 625         exp=is_export?" export":"";
 626
 627         if (alg & SSL_SSLV2)
 628                 ver="SSLv2";
 629         else if (alg & SSL_SSLV3)
 630                 ver="SSLv3";
 631         else
 632                 ver="unknown";
 633
 634         switch (alg&SSL_MKEY_MASK)
 635                 {
 636         case SSL_kRSA:
 637                 kx=is_export?(pkl == 512 ? "RSA(512)" : "RSA(1024)"):"RSA";
 638                 break;
 639         case SSL_kDHr:
 640                 kx="DH/RSA";
 641                 break;
 642         case SSL_kDHd:
 643                 kx="DH/DSS";
 644                 break;
 645         case SSL_kFZA:
 646                 kx="Fortezza";
 647                 break;
 648         case SSL_kEDH:
 649                 kx=is_export?(pkl == 512 ? "DH(512)" : "DH(1024)"):"DH";
 650                 break;
 651         default:
 652                 kx="unknown";
 653                 }
 654
 655         switch (alg&SSL_AUTH_MASK)
 656                 {
 657         case SSL_aRSA:
 658                 au="RSA";
 659                 break;
 660         case SSL_aDSS:
 661                 au="DSS";
 662                 break;
 663         case SSL_aDH:
 664                 au="DH";
 665                 break;
 666         case SSL_aFZA:
 667         case SSL_aNULL:
 668                 au="None";
 669                 break;
 670         default:
 671                 au="unknown";
 672                 break;
 673                 }
 674
 675         switch (alg&SSL_ENC_MASK)
 676                 {
 677         case SSL_DES:
 678                 enc=(is_export && kl == 5)?"DES(40)":"DES(56)";
 679                 break;
 680         case SSL_3DES:
 681                 enc="3DES(168)";
 682                 break;
 683         case SSL_RC4:
 684                 enc=is_export?(kl == 5 ? "RC4(40)" : "RC4(56)")
 685                   :((alg2&SSL2_CF_8_BYTE_ENC)?"RC4(64)":"RC4(128)");
 686                 break;
 687         case SSL_RC2:
 688                 enc=is_export?(kl == 5 ? "RC2(40)" : "RC2(56)"):"RC2(128)";
 689                 break;
 690         case SSL_IDEA:
 691                 enc="IDEA(128)";
 692                 break;
 693         case SSL_eFZA:
 694                 enc="Fortezza";
 695                 break;
 696         case SSL_eNULL:
 697                 enc="None";
 698                 break;
 699         default:
 700                 enc="unknown";
 701                 break;
 702                 }
 703
 704         switch (alg&SSL_MAC_MASK)
 705                 {
 706         case SSL_MD5:
 707                 mac="MD5";
 708                 break;
 709         case SSL_SHA1:
 710                 mac="SHA1";
 711                 break;
 712         default:
 713                 mac="unknown";
 714                 break;
 715                 }
 716
 717         if (buf == NULL)
 718                 {
 719                 buf=Malloc(128);
 720                 if (buf == NULL) return("Malloc Error");
 721                 }
 722         else if (len < 128)
 723                 return("Buffer too small");
 724
 725         sprintf(buf,format,cipher->name,ver,kx,au,enc,mac,exp);
 726         return(buf);
 727         }
 728
 729 char *SSL_CIPHER_get_version(SSL_CIPHER *c)
 730         {
 731         int i;
 732
 733         if (c == NULL) return("(NONE)");
 734         i=(int)(c->id>>24L);
 735         if (i == 3)
 736                 return("TLSv1/SSLv3");
 737         else if (i == 2)
 738                 return("SSLv2");
 739         else
 740                 return("unknown");
 741         }
 742
 743 /* return the actual cipher being used */
 744 const char *SSL_CIPHER_get_name(SSL_CIPHER *c)
 745         {
 746         if (c != NULL)
 747                 return(c->name);
 748         return("(NONE)");
 749         }
 750
 751 /* number of bits for symetric cipher */
 752 int SSL_CIPHER_get_bits(SSL_CIPHER *c, int *alg_bits)
 753         {
 754         int ret=0,a=0;
 755         const EVP_CIPHER *enc;
 756         const EVP_MD *md;
 757         SSL_SESSION ss;
 758
 759         if (c != NULL)
 760                 {
 761                 ss.cipher=c;
 762                 if (!ssl_cipher_get_evp(&ss,&enc,&md,NULL))
 763                         return(0);
 764
 765                 a=EVP_CIPHER_key_length(enc)*8;
 766
 767                 if (SSL_C_IS_EXPORT(c))
 768                         {
 769                         ret=SSL_C_EXPORT_KEYLENGTH(c)*8;
 770                         }
 771                 else
 772                         {
 773                         if (c->algorithm2 & SSL2_CF_8_BYTE_ENC)
 774                                 ret=64;
 775                         else
 776                                 ret=a;
 777                         }
 778                 }
 779
 780         if (alg_bits != NULL) *alg_bits=a;
 781
 782         return(ret);
 783         }
 784
 785 SSL_COMP *ssl3_comp_find(STACK_OF(SSL_COMP) *sk, int n)
 786         {
 787         SSL_COMP *ctmp;
 788         int i,nn;
 789
 790         if ((n == 0) || (sk == NULL)) return(NULL);
 791         nn=sk_SSL_COMP_num(sk);
 792         for (i=0; i<nn; i++)
 793                 {
 794                 ctmp=sk_SSL_COMP_value(sk,i);
 795                 if (ctmp->id == n)
 796                         return(ctmp);
 797                 }
 798         return(NULL);
 799         }
 800
 801 static int sk_comp_cmp(SSL_COMP **a,SSL_COMP **b)
 802         {
 803         return((*a)->id-(*b)->id);
 804         }
 805
 806 STACK_OF(SSL_COMP) *SSL_COMP_get_compression_methods(void)
 807         {
 808         return(ssl_comp_methods);
 809         }
 810
 811 int SSL_COMP_add_compression_method(int id, COMP_METHOD *cm)
 812         {
 813         SSL_COMP *comp;
 814         STACK_OF(SSL_COMP) *sk;
 815
 816         comp=(SSL_COMP *)Malloc(sizeof(SSL_COMP));
 817         comp->id=id;
 818         comp->method=cm;
 819         if (ssl_comp_methods == NULL)
 820                 sk=ssl_comp_methods=sk_SSL_COMP_new(sk_comp_cmp);
 821         else
 822                 sk=ssl_comp_methods;
 823         if ((sk == NULL) || !sk_SSL_COMP_push(sk,comp))
 824                 {
 825                 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,ERR_R_MALLOC_FAILURE);
 826                 return(0);
 827                 }
 828         else
 829                 return(1);
 830         }
 831