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 EVP_CIPHER *ssl_cipher_methods[SSL_ENC_NUM_IDX]={
  74         NULL,NULL,NULL,NULL,NULL,NULL,
  75         };
  76
  77 static STACK /* 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 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         {0,SSL_TXT_ALL, 0,SSL_ALL,   0,SSL_ALL},        /* must be first */
 115         {0,SSL_TXT_kRSA,0,SSL_kRSA,  0,SSL_MKEY_MASK},
 116         {0,SSL_TXT_kDHr,0,SSL_kDHr,  0,SSL_MKEY_MASK},
 117         {0,SSL_TXT_kDHd,0,SSL_kDHd,  0,SSL_MKEY_MASK},
 118         {0,SSL_TXT_kEDH,0,SSL_kEDH,  0,SSL_MKEY_MASK},
 119         {0,SSL_TXT_kFZA,0,SSL_kFZA,  0,SSL_MKEY_MASK},
 120         {0,SSL_TXT_DH,  0,SSL_DH,    0,SSL_MKEY_MASK},
 121         {0,SSL_TXT_EDH, 0,SSL_EDH,   0,SSL_MKEY_MASK|SSL_AUTH_MASK},
 122
 123         {0,SSL_TXT_aRSA,0,SSL_aRSA,  0,SSL_AUTH_MASK},
 124         {0,SSL_TXT_aDSS,0,SSL_aDSS,  0,SSL_AUTH_MASK},
 125         {0,SSL_TXT_aFZA,0,SSL_aFZA,  0,SSL_AUTH_MASK},
 126         {0,SSL_TXT_aNULL,0,SSL_aNULL,0,SSL_AUTH_MASK},
 127         {0,SSL_TXT_aDH, 0,SSL_aDH,   0,SSL_AUTH_MASK},
 128         {0,SSL_TXT_DSS, 0,SSL_DSS,   0,SSL_AUTH_MASK},
 129
 130         {0,SSL_TXT_DES, 0,SSL_DES,   0,SSL_ENC_MASK},
 131         {0,SSL_TXT_3DES,0,SSL_3DES,  0,SSL_ENC_MASK},
 132         {0,SSL_TXT_RC4, 0,SSL_RC4,   0,SSL_ENC_MASK},
 133         {0,SSL_TXT_RC2, 0,SSL_RC2,   0,SSL_ENC_MASK},
 134         {0,SSL_TXT_IDEA,0,SSL_IDEA,  0,SSL_ENC_MASK},
 135         {0,SSL_TXT_eNULL,0,SSL_eNULL,0,SSL_ENC_MASK},
 136         {0,SSL_TXT_eFZA,0,SSL_eFZA,  0,SSL_ENC_MASK},
 137
 138         {0,SSL_TXT_MD5, 0,SSL_MD5,   0,SSL_MAC_MASK},
 139         {0,SSL_TXT_SHA1,0,SSL_SHA1,  0,SSL_MAC_MASK},
 140         {0,SSL_TXT_SHA, 0,SSL_SHA,   0,SSL_MAC_MASK},
 141
 142         {0,SSL_TXT_NULL,0,SSL_NULL,  0,SSL_ENC_MASK},
 143         {0,SSL_TXT_RSA, 0,SSL_RSA,   0,SSL_AUTH_MASK|SSL_MKEY_MASK},
 144         {0,SSL_TXT_ADH, 0,SSL_ADH,   0,SSL_AUTH_MASK|SSL_MKEY_MASK},
 145         {0,SSL_TXT_FZA, 0,SSL_FZA,   0,SSL_AUTH_MASK|SSL_MKEY_MASK|SSL_ENC_MASK},
 146
 147         {0,SSL_TXT_EXP40, 0,SSL_EXP40, 0,SSL_EXP_MASK},
 148         {0,SSL_TXT_EXPORT,0,SSL_EXP40, 0,SSL_EXP_MASK},
 149         {0,SSL_TXT_EXP56, 0,SSL_EXP56, 0,SSL_EXP_MASK},
 150         {0,SSL_TXT_SSLV2, 0,SSL_SSLV2, 0,SSL_SSL_MASK},
 151         {0,SSL_TXT_SSLV3, 0,SSL_SSLV3, 0,SSL_SSL_MASK},
 152         {0,SSL_TXT_TLSV1, 0,SSL_TLSV1, 0,SSL_SSL_MASK},
 153         {0,SSL_TXT_LOW,   0,SSL_LOW,   0,SSL_STRONG_MASK},
 154         {0,SSL_TXT_MEDIUM,0,SSL_MEDIUM,0,SSL_STRONG_MASK},
 155         {0,SSL_TXT_HIGH,  0,SSL_HIGH,  0,SSL_STRONG_MASK},
 156         };
 157
 158 static int init_ciphers=1;
 159 static void load_ciphers();
 160
 161 static int cmp_by_name(a,b)
 162 SSL_CIPHER **a,**b;
 163         {
 164         return(strcmp((*a)->name,(*b)->name));
 165         }
 166
 167 static void load_ciphers()
 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(s,enc,md,comp)
 188 SSL_SESSION *s;
 189 EVP_CIPHER **enc;
 190 EVP_MD **md;
 191 SSL_COMP **comp;
 192         {
 193         int i;
 194         SSL_CIPHER *c;
 195
 196         c=s->cipher;
 197         if (c == NULL) return(0);
 198         if (comp != NULL)
 199                 {
 200                 SSL_COMP ctmp;
 201
 202                 if (s->compress_meth == 0)
 203                         *comp=NULL;
 204                 else if (ssl_comp_methods == NULL)
 205                         {
 206                         /* bad */
 207                         *comp=NULL;
 208                         }
 209                 else
 210                         {
 211
 212                         ctmp.id=s->compress_meth;
 213                         i=sk_find(ssl_comp_methods,(char *)&ctmp);
 214                         if (i >= 0)
 215                                 *comp=(SSL_COMP *)sk_value(ssl_comp_methods,i);
 216                         else
 217                                 *comp=NULL;
 218                         }
 219                 }
 220
 221         if ((enc == NULL) || (md == NULL)) return(0);
 222
 223         switch (c->algorithms & SSL_ENC_MASK)
 224                 {
 225         case SSL_DES:
 226                 i=SSL_ENC_DES_IDX;
 227                 break;
 228         case SSL_3DES:
 229                 i=SSL_ENC_3DES_IDX;
 230                 break;
 231         case SSL_RC4:
 232                 i=SSL_ENC_RC4_IDX;
 233                 break;
 234         case SSL_RC2:
 235                 i=SSL_ENC_RC2_IDX;
 236                 break;
 237         case SSL_IDEA:
 238                 i=SSL_ENC_IDEA_IDX;
 239                 break;
 240         case SSL_eNULL:
 241                 i=SSL_ENC_NULL_IDX;
 242                 break;
 243         default:
 244                 i= -1;
 245                 break;
 246                 }
 247
 248         if ((i < 0) || (i > SSL_ENC_NUM_IDX))
 249                 *enc=NULL;
 250         else
 251                 {
 252                 if (i == SSL_ENC_NULL_IDX)
 253                         *enc=EVP_enc_null();
 254                 else
 255                         *enc=ssl_cipher_methods[i];
 256                 }
 257
 258         switch (c->algorithms & SSL_MAC_MASK)
 259                 {
 260         case SSL_MD5:
 261                 i=SSL_MD_MD5_IDX;
 262                 break;
 263         case SSL_SHA1:
 264                 i=SSL_MD_SHA1_IDX;
 265                 break;
 266         default:
 267                 i= -1;
 268                 break;
 269                 }
 270         if ((i < 0) || (i > SSL_MD_NUM_IDX))
 271                 *md=NULL;
 272         else
 273                 *md=ssl_digest_methods[i];
 274
 275         if ((*enc != NULL) && (*md != NULL))
 276                 return(1);
 277         else
 278                 return(0);
 279         }
 280
 281 #define ITEM_SEP(a) \
 282         (((a) == ':') || ((a) == ' ') || ((a) == ';') || ((a) == ','))
 283
 284 static void ll_append_tail(head,curr,tail)
 285 CIPHER_ORDER **head,*curr,**tail;
 286         {
 287         if (curr == *tail) return;
 288         if (curr == *head)
 289                 *head=curr->next;
 290         if (curr->prev != NULL)
 291                 curr->prev->next=curr->next;
 292         if (curr->next != NULL) /* should always be true */
 293                 curr->next->prev=curr->prev;
 294         (*tail)->next=curr;
 295         curr->prev= *tail;
 296         curr->next=NULL;
 297         *tail=curr;
 298         }
 299
 300 STACK *ssl_create_cipher_list(ssl_method,cipher_list,cipher_list_by_id,str)
 301 SSL_METHOD *ssl_method;
 302 STACK **cipher_list,**cipher_list_by_id;
 303 char *str;
 304         {
 305         SSL_CIPHER *c;
 306         char *l;
 307         STACK *ret=NULL,*ok=NULL;
 308 #define CL_BUF  40
 309         char buf[CL_BUF];
 310         char *tmp_str=NULL;
 311         unsigned long mask,algorithms,ma;
 312         char *start;
 313         int i,j,k,num=0,ch,multi;
 314         unsigned long al;
 315         STACK *ca_list=NULL;
 316         int current_x,num_x;
 317         CIPHER_CHOICE *ops=NULL;
 318         CIPHER_ORDER *list=NULL,*head=NULL,*tail=NULL,*curr,*tail2,*curr2;
 319         int list_num;
 320         int type;
 321         SSL_CIPHER c_tmp,*cp;
 322
 323         if (str == NULL) return(NULL);
 324
 325         if (strncmp(str,"DEFAULT",7) == 0)
 326                 {
 327                 i=strlen(str)+2+strlen(SSL_DEFAULT_CIPHER_LIST);
 328                 if ((tmp_str=Malloc(i)) == NULL)
 329                         {
 330                         SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE);
 331                         goto err;
 332                         }
 333                 strcpy(tmp_str,SSL_DEFAULT_CIPHER_LIST);
 334                 strcat(tmp_str,":");
 335                 strcat(tmp_str,&(str[7]));
 336                 str=tmp_str;
 337                 }
 338         if (init_ciphers) load_ciphers();
 339
 340         num=ssl_method->num_ciphers();
 341
 342         if ((ret=(STACK *)sk_new(NULL)) == NULL) goto err;
 343         if ((ca_list=(STACK *)sk_new(cmp_by_name)) == NULL) goto err;
 344
 345         mask =SSL_kFZA;
 346 #ifdef NO_RSA
 347         mask|=SSL_aRSA|SSL_kRSA;
 348 #endif
 349 #ifdef NO_DSA
 350         mask|=SSL_aDSS;
 351 #endif
 352 #ifdef NO_DH
 353         mask|=SSL_kDHr|SSL_kDHd|SSL_kEDH|SSL_aDH;
 354 #endif
 355
 356 #ifndef SSL_ALLOW_ENULL
 357         mask|=SSL_eNULL;
 358 #endif
 359
 360         mask|=(ssl_cipher_methods[SSL_ENC_DES_IDX ] == NULL)?SSL_DES :0;
 361         mask|=(ssl_cipher_methods[SSL_ENC_3DES_IDX] == NULL)?SSL_3DES:0;
 362         mask|=(ssl_cipher_methods[SSL_ENC_RC4_IDX ] == NULL)?SSL_RC4 :0;
 363         mask|=(ssl_cipher_methods[SSL_ENC_RC2_IDX ] == NULL)?SSL_RC2 :0;
 364         mask|=(ssl_cipher_methods[SSL_ENC_IDEA_IDX] == NULL)?SSL_IDEA:0;
 365         mask|=(ssl_cipher_methods[SSL_ENC_eFZA_IDX] == NULL)?SSL_eFZA:0;
 366
 367         mask|=(ssl_digest_methods[SSL_MD_MD5_IDX ] == NULL)?SSL_MD5 :0;
 368         mask|=(ssl_digest_methods[SSL_MD_SHA1_IDX] == NULL)?SSL_SHA1:0;
 369
 370         if ((list=(CIPHER_ORDER *)Malloc(sizeof(CIPHER_ORDER)*num)) == NULL)
 371                 goto err;
 372
 373         /* Get the initial list of ciphers */
 374         list_num=0;
 375         for (i=0; i<num; i++)
 376                 {
 377                 c=ssl_method->get_cipher((unsigned int)i);
 378                 /* drop those that use any of that is not available */
 379                 if ((c != NULL) && c->valid && !(c->algorithms & mask))
 380                         {
 381                         list[list_num].cipher=c;
 382                         list[list_num].next=NULL;
 383                         list[list_num].prev=NULL;
 384                         list[list_num].active=0;
 385                         list_num++;
 386                         if (!sk_push(ca_list,(char *)c)) goto err;
 387                         }
 388                 }
 389
 390         for (i=1; i<list_num-1; i++)
 391                 {
 392                 list[i].prev= &(list[i-1]);
 393                 list[i].next= &(list[i+1]);
 394                 }
 395         if (list_num > 0)
 396                 {
 397                 head= &(list[0]);
 398                 head->prev=NULL;
 399                 head->next= &(list[1]);
 400                 tail= &(list[list_num-1]);
 401                 tail->prev= &(list[list_num-2]);
 402                 tail->next=NULL;
 403                 }
 404
 405         /* special case */
 406         cipher_aliases[0].algorithms= ~mask;
 407
 408         /* get the aliases */
 409         k=sizeof(cipher_aliases)/sizeof(SSL_CIPHER);
 410         for (j=0; j<k; j++)
 411                 {
 412                 al=cipher_aliases[j].algorithms;
 413                 /* Drop those that are not relevent */
 414                 if ((al & mask) == al) continue;
 415                 if (!sk_push(ca_list,(char *)&(cipher_aliases[j]))) goto err;
 416                 }
 417
 418         /* ca_list now holds a 'stack' of SSL_CIPHERS, some real, some
 419          * 'aliases' */
 420
 421         /* how many parameters are there? */
 422         num=1;
 423         for (l=str; *l; l++)
 424                 if (ITEM_SEP(*l))
 425                         num++;
 426         ops=(CIPHER_CHOICE *)Malloc(sizeof(CIPHER_CHOICE)*num);
 427         if (ops == NULL) goto err;
 428         memset(ops,0,sizeof(CIPHER_CHOICE)*num);
 429
 430         /* we now parse the input string and create our operations */
 431         l=str;
 432         i=0;
 433         current_x=0;
 434
 435         for (;;)
 436                 {
 437                 ch= *l;
 438
 439                 if (ch == '\0') break;
 440
 441                 if (ch == '-')
 442                         { j=CIPHER_DEL; l++; }
 443                 else if (ch == '+')
 444                         { j=CIPHER_ORD; l++; }
 445                 else if (ch == '!')
 446                         { j=CIPHER_KILL; l++; }
 447                 else
 448                         { j=CIPHER_ADD; }
 449
 450                 if (ITEM_SEP(ch))
 451                         {
 452                         l++;
 453                         continue;
 454                         }
 455                 ops[current_x].type=j;
 456                 ops[current_x].algorithms=0;
 457                 ops[current_x].mask=0;
 458
 459                 start=l;
 460                 for (;;)
 461                         {
 462                         ch= *l;
 463                         i=0;
 464                         while ( ((ch >= 'A') && (ch <= 'Z')) ||
 465                                 ((ch >= '0') && (ch <= '9')) ||
 466                                 ((ch >= 'a') && (ch <= 'z')) ||
 467                                  (ch == '-'))
 468                                  {
 469                                  buf[i]=ch;
 470                                  ch= *(++l);
 471                                  i++;
 472                                  if (i >= (CL_BUF-2)) break;
 473                                  }
 474                         buf[i]='\0';
 475
 476                         /* check for multi-part specification */
 477                         if (ch == '+')
 478                                 {
 479                                 multi=1;
 480                                 l++;
 481                                 }
 482                         else
 483                                 multi=0;
 484
 485                         c_tmp.name=buf;
 486                         j=sk_find(ca_list,(char *)&c_tmp);
 487                         if (j < 0)
 488                                 goto end_loop;
 489
 490                         cp=(SSL_CIPHER *)sk_value(ca_list,j);
 491                         ops[current_x].algorithms|=cp->algorithms;
 492                         /* We add the SSL_SSL_MASK so we can match the
 493                          * SSLv2 and SSLv3 versions of RC4-MD5 */
 494                         ops[current_x].mask|=cp->mask;
 495                         if (!multi) break;
 496                         }
 497                 current_x++;
 498                 if (ch == '\0') break;
 499 end_loop:
 500                 /* Make sure we scan until the next valid start point */
 501                 while ((*l != '\0') && ITEM_SEP(*l))
 502                         l++;
 503                 }
 504
 505         num_x=current_x;
 506         current_x=0;
 507
 508         /* We will now process the list of ciphers, once for each category, to
 509          * decide what we should do with it. */
 510         for (j=0; j<num_x; j++)
 511                 {
 512                 algorithms=ops[j].algorithms;
 513                 type=ops[j].type;
 514                 mask=ops[j].mask;
 515
 516                 curr=head;
 517                 curr2=head;
 518                 tail2=tail;
 519                 for (;;)
 520                         {
 521                         if ((curr == NULL) || (curr == tail2)) break;
 522                         curr=curr2;
 523                         curr2=curr->next;
 524
 525                         cp=curr->cipher;
 526                         ma=mask & cp->algorithms;
 527                         if ((ma == 0) || ((ma & algorithms) != ma))
 528                                 {
 529                                 /* does not apply */
 530                                 continue;
 531                                 }
 532
 533                         /* add the cipher if it has not been added yet. */
 534                         if (type == CIPHER_ADD)
 535                                 {
 536                                 if (!curr->active)
 537                                         {
 538                                         ll_append_tail(&head,curr,&tail);
 539                                         curr->active=1;
 540                                         }
 541                                 }
 542                         /* Move the added cipher to this location */
 543                         else if (type == CIPHER_ORD)
 544                                 {
 545                                 if (curr->active)
 546                                         {
 547                                         ll_append_tail(&head,curr,&tail);
 548                                         }
 549                                 }
 550                         else if (type == CIPHER_DEL)
 551                                 curr->active=0;
 552                         if (type == CIPHER_KILL)
 553                                 {
 554                                 if (head == curr)
 555                                         head=curr->next;
 556                                 else
 557                                         curr->prev->next=curr->next;
 558                                 if (tail == curr)
 559                                         tail=curr->prev;
 560                                 curr->active=0;
 561                                 if (curr->next != NULL)
 562                                         curr->next->prev=curr->prev;
 563                                 if (curr->prev != NULL)
 564                                         curr->prev->next=curr->next;
 565                                 curr->next=NULL;
 566                                 curr->prev=NULL;
 567                                 }
 568                         }
 569                 }
 570
 571         for (curr=head; curr != NULL; curr=curr->next)
 572                 {
 573                 if (curr->active)
 574                         {
 575                         sk_push(ret,(char *)curr->cipher);
 576 #ifdef CIPHER_DEBUG
 577                         printf("<%s>\n",curr->cipher->name);
 578 #endif
 579                         }
 580                 }
 581
 582         if (cipher_list != NULL)
 583                 {
 584                 if (*cipher_list != NULL)
 585                         sk_free(*cipher_list);
 586                 *cipher_list=ret;
 587                 }
 588
 589         if (cipher_list_by_id != NULL)
 590                 {
 591                 if (*cipher_list_by_id != NULL)
 592                         sk_free(*cipher_list_by_id);
 593                 *cipher_list_by_id=sk_dup(ret);
 594                 }
 595
 596         if (    (cipher_list_by_id == NULL) ||
 597                 (*cipher_list_by_id == NULL) ||
 598                 (cipher_list == NULL) ||
 599                 (*cipher_list == NULL))
 600                 goto err;
 601         sk_set_cmp_func(*cipher_list_by_id,ssl_cipher_ptr_id_cmp);
 602
 603         ok=ret;
 604         ret=NULL;
 605 err:
 606         if (tmp_str) Free(tmp_str);
 607         if (ops != NULL) Free(ops);
 608         if (ret != NULL) sk_free(ret);
 609         if (ca_list != NULL) sk_free(ca_list);
 610         if (list != NULL) Free(list);
 611         return(ok);
 612         }
 613
 614 char *SSL_CIPHER_description(cipher,buf,len)
 615 SSL_CIPHER *cipher;
 616 char *buf;
 617 int len;
 618         {
 619         int _export,pkl,kl;
 620         char *ver,*exp;
 621         char *kx,*au,*enc,*mac;
 622         unsigned long alg,alg2;
 623         static char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s\n";
 624
 625         alg=cipher->algorithms;
 626         alg2=cipher->algorithm2;
 627
 628         _export=SSL_IS_EXPORT(alg);
 629         pkl=SSL_EXPORT_PKEYLENGTH(alg);
 630         kl=SSL_EXPORT_KEYLENGTH(alg);
 631         exp=_export?" export":"";
 632
 633         if (alg & SSL_SSLV2)
 634                 ver="SSLv2";
 635         else if (alg & SSL_SSLV3)
 636                 ver="SSLv3";
 637         else
 638                 ver="unknown";
 639
 640         switch (alg&SSL_MKEY_MASK)
 641                 {
 642         case SSL_kRSA:
 643                 kx=_export?(pkl == 512 ? "RSA(512)" : "RSA(1024)"):"RSA";
 644                 break;
 645         case SSL_kDHr:
 646                 kx="DH/RSA";
 647                 break;
 648         case SSL_kDHd:
 649                 kx="DH/DSS";
 650                 break;
 651         case SSL_kFZA:
 652                 kx="Fortezza";
 653                 break;
 654         case SSL_kEDH:
 655                 kx=_export?(pkl == 512 ? "DH(512)" : "DH(1024)"):"DH";
 656                 break;
 657         default:
 658                 kx="unknown";
 659                 }
 660
 661         switch (alg&SSL_AUTH_MASK)
 662                 {
 663         case SSL_aRSA:
 664                 au="RSA";
 665                 break;
 666         case SSL_aDSS:
 667                 au="DSS";
 668                 break;
 669         case SSL_aDH:
 670                 au="DH";
 671                 break;
 672         case SSL_aFZA:
 673         case SSL_aNULL:
 674                 au="None";
 675                 break;
 676         default:
 677                 au="unknown";
 678                 break;
 679                 }
 680
 681         switch (alg&SSL_ENC_MASK)
 682                 {
 683         case SSL_DES:
 684                 enc=(_export && kl == 5)?"DES(40)":"DES(56)";
 685                 break;
 686         case SSL_3DES:
 687                 enc="3DES(168)";
 688                 break;
 689         case SSL_RC4:
 690                 enc=_export?(kl == 5 ? "RC4(40)" : "RC4(56)")
 691                   :((alg2&SSL2_CF_8_BYTE_ENC)?"RC4(64)":"RC4(128)");
 692                 break;
 693         case SSL_RC2:
 694                 enc=_export?(kl == 5 ? "RC2(40)" : "RC2(56)"):"RC2(128)";
 695                 break;
 696         case SSL_IDEA:
 697                 enc="IDEA(128)";
 698                 break;
 699         case SSL_eFZA:
 700                 enc="Fortezza";
 701                 break;
 702         case SSL_eNULL:
 703                 enc="None";
 704                 break;
 705         default:
 706                 enc="unknown";
 707                 break;
 708                 }
 709
 710         switch (alg&SSL_MAC_MASK)
 711                 {
 712         case SSL_MD5:
 713                 mac="MD5";
 714                 break;
 715         case SSL_SHA1:
 716                 mac="SHA1";
 717                 break;
 718         default:
 719                 mac="unknown";
 720                 break;
 721                 }
 722
 723         if (buf == NULL)
 724                 {
 725                 buf=Malloc(128);
 726                 if (buf == NULL) return("Malloc Error");
 727                 }
 728         else if (len < 128)
 729                 return("Buffer too small");
 730
 731         sprintf(buf,format,cipher->name,ver,kx,au,enc,mac,exp);
 732         return(buf);
 733         }
 734
 735 char *SSL_CIPHER_get_version(c)
 736 SSL_CIPHER *c;
 737         {
 738         int i;
 739
 740         if (c == NULL) return("(NONE)");
 741         i=(int)(c->id>>24L);
 742         if (i == 3)
 743                 return("TLSv1/SSLv3");
 744         else if (i == 2)
 745                 return("SSLv2");
 746         else
 747                 return("unknown");
 748         }
 749
 750 /* return the actual cipher being used */
 751 char *SSL_CIPHER_get_name(c)
 752 SSL_CIPHER *c;
 753         {
 754         if (c != NULL)
 755                 return(c->name);
 756         return("(NONE)");
 757         }
 758
 759 /* number of bits for symetric cipher */
 760 int SSL_CIPHER_get_bits(c,alg_bits)
 761 SSL_CIPHER *c;
 762 int *alg_bits;
 763         {
 764         int ret=0,a=0;
 765         EVP_CIPHER *enc;
 766         EVP_MD *md;
 767         SSL_SESSION ss;
 768
 769         if (c != NULL)
 770                 {
 771                 ss.cipher=c;
 772                 if (!ssl_cipher_get_evp(&ss,&enc,&md,NULL))
 773                         return(0);
 774
 775                 a=EVP_CIPHER_key_length(enc)*8;
 776
 777                 if (SSL_C_IS_EXPORT(c))
 778                         {
 779                         ret=SSL_C_EXPORT_KEYLENGTH(c)*8;
 780                         }
 781                 else
 782                         {
 783                         if (c->algorithm2 & SSL2_CF_8_BYTE_ENC)
 784                                 ret=64;
 785                         else
 786                                 ret=a;
 787                         }
 788                 }
 789
 790         if (alg_bits != NULL) *alg_bits=a;
 791
 792         return(ret);
 793         }
 794
 795 SSL_COMP *ssl3_comp_find(sk,n)
 796 STACK *sk;
 797 int n;
 798         {
 799         SSL_COMP *ctmp;
 800         int i,nn;
 801
 802         if ((n == 0) || (sk == NULL)) return(NULL);
 803         nn=sk_num(sk);
 804         for (i=0; i<nn; i++)
 805                 {
 806                 ctmp=(SSL_COMP *)sk_value(sk,i);
 807                 if (ctmp->id == n)
 808                         return(ctmp);
 809                 }
 810         return(NULL);
 811         }
 812
 813 static int sk_comp_cmp(a,b)
 814 SSL_COMP **a,**b;
 815         {
 816         return((*a)->id-(*b)->id);
 817         }
 818
 819 STACK *SSL_COMP_get_compression_methods()
 820         {
 821         return(ssl_comp_methods);
 822         }
 823
 824 int SSL_COMP_add_compression_method(id,cm)
 825 int id;
 826 COMP_METHOD *cm;
 827         {
 828         SSL_COMP *comp;
 829         STACK *sk;
 830
 831         comp=(SSL_COMP *)Malloc(sizeof(SSL_COMP));
 832         comp->id=id;
 833         comp->method=cm;
 834         if (ssl_comp_methods == NULL)
 835                 sk=ssl_comp_methods=sk_new(sk_comp_cmp);
 836         else
 837                 sk=ssl_comp_methods;
 838         if ((sk == NULL) || !sk_push(sk,(char *)comp))
 839                 {
 840                 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,ERR_R_MALLOC_FAILURE);
 841                 return(0);
 842                 }
 843         else
 844                 return(1);
 845         }
 846