crypto/x509/x509_lu.c

   1 /* crypto/x509/x509_lu.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 "cryptlib.h"
  61 #include <openssl/lhash.h>
  62 #include <openssl/x509.h>
  63
  64 static STACK_OF(CRYPTO_EX_DATA_FUNCS) *x509_store_meth=NULL;
  65
  66 X509_LOOKUP *X509_LOOKUP_new(X509_LOOKUP_METHOD *method)
  67         {
  68         X509_LOOKUP *ret;
  69
  70         ret=(X509_LOOKUP *)OPENSSL_malloc(sizeof(X509_LOOKUP));
  71         if (ret == NULL) return(NULL);
  72
  73         ret->init=0;
  74         ret->skip=0;
  75         ret->method=method;
  76         ret->method_data=NULL;
  77         ret->store_ctx=NULL;
  78         if ((method->new_item != NULL) && !method->new_item(ret))
  79                 {
  80                 OPENSSL_free(ret);
  81                 return(NULL);
  82                 }
  83         return(ret);
  84         }
  85
  86 void X509_LOOKUP_free(X509_LOOKUP *ctx)
  87         {
  88         if (ctx == NULL) return;
  89         if (    (ctx->method != NULL) &&
  90                 (ctx->method->free != NULL))
  91                 ctx->method->free(ctx);
  92         OPENSSL_free(ctx);
  93         }
  94
  95 int X509_LOOKUP_init(X509_LOOKUP *ctx)
  96         {
  97         if (ctx->method == NULL) return(0);
  98         if (ctx->method->init != NULL)
  99                 return(ctx->method->init(ctx));
 100         else
 101                 return(1);
 102         }
 103
 104 int X509_LOOKUP_shutdown(X509_LOOKUP *ctx)
 105         {
 106         if (ctx->method == NULL) return(0);
 107         if (ctx->method->shutdown != NULL)
 108                 return(ctx->method->shutdown(ctx));
 109         else
 110                 return(1);
 111         }
 112
 113 int X509_LOOKUP_ctrl(X509_LOOKUP *ctx, int cmd, const char *argc, long argl,
 114              char **ret)
 115         {
 116         if (ctx->method == NULL) return(-1);
 117         if (ctx->method->ctrl != NULL)
 118                 return(ctx->method->ctrl(ctx,cmd,argc,argl,ret));
 119         else
 120                 return(1);
 121         }
 122
 123 int X509_LOOKUP_by_subject(X509_LOOKUP *ctx, int type, X509_NAME *name,
 124              X509_OBJECT *ret)
 125         {
 126         if ((ctx->method == NULL) || (ctx->method->get_by_subject == NULL))
 127                 return(X509_LU_FAIL);
 128         if (ctx->skip) return(0);
 129         return(ctx->method->get_by_subject(ctx,type,name,ret));
 130         }
 131
 132 int X509_LOOKUP_by_issuer_serial(X509_LOOKUP *ctx, int type, X509_NAME *name,
 133              ASN1_INTEGER *serial, X509_OBJECT *ret)
 134         {
 135         if ((ctx->method == NULL) ||
 136                 (ctx->method->get_by_issuer_serial == NULL))
 137                 return(X509_LU_FAIL);
 138         return(ctx->method->get_by_issuer_serial(ctx,type,name,serial,ret));
 139         }
 140
 141 int X509_LOOKUP_by_fingerprint(X509_LOOKUP *ctx, int type,
 142              unsigned char *bytes, int len, X509_OBJECT *ret)
 143         {
 144         if ((ctx->method == NULL) || (ctx->method->get_by_fingerprint == NULL))
 145                 return(X509_LU_FAIL);
 146         return(ctx->method->get_by_fingerprint(ctx,type,bytes,len,ret));
 147         }
 148
 149 int X509_LOOKUP_by_alias(X509_LOOKUP *ctx, int type, char *str, int len,
 150              X509_OBJECT *ret)
 151         {
 152         if ((ctx->method == NULL) || (ctx->method->get_by_alias == NULL))
 153                 return(X509_LU_FAIL);
 154         return(ctx->method->get_by_alias(ctx,type,str,len,ret));
 155         }
 156
 157
 158 static int x509_object_cmp(const X509_OBJECT * const *a, const X509_OBJECT * const *b)
 159         {
 160         int ret;
 161
 162         ret=((*a)->type - (*b)->type);
 163         if (ret) return(ret);
 164         switch ((*a)->type)
 165                 {
 166         case X509_LU_X509:
 167                 ret=X509_subject_name_cmp((*a)->data.x509,(*b)->data.x509);
 168                 break;
 169         case X509_LU_CRL:
 170                 ret=X509_CRL_cmp((*a)->data.crl,(*b)->data.crl);
 171                 break;
 172         default:
 173                 /* abort(); */
 174                 return 0;
 175                 }
 176         return(ret);
 177         }
 178
 179 X509_STORE *X509_STORE_new(void)
 180         {
 181         X509_STORE *ret;
 182
 183         if ((ret=(X509_STORE *)OPENSSL_malloc(sizeof(X509_STORE))) == NULL)
 184                 return(NULL);
 185         ret->objs = sk_X509_OBJECT_new(x509_object_cmp);
 186         ret->cache=1;
 187         ret->get_cert_methods=sk_X509_LOOKUP_new_null();
 188         ret->verify=NULL;
 189         ret->verify_cb=NULL;
 190         memset(&ret->ex_data,0,sizeof(CRYPTO_EX_DATA));
 191         ret->references=1;
 192         ret->depth=0;
 193         return(ret);
 194         }
 195
 196 static void cleanup(X509_OBJECT *a)
 197         {
 198         if (a->type == X509_LU_X509)
 199                 {
 200                 X509_free(a->data.x509);
 201                 }
 202         else if (a->type == X509_LU_CRL)
 203                 {
 204                 X509_CRL_free(a->data.crl);
 205                 }
 206         else
 207                 {
 208                 /* abort(); */
 209                 }
 210
 211         OPENSSL_free(a);
 212         }
 213
 214 void X509_STORE_free(X509_STORE *vfy)
 215         {
 216         int i;
 217         STACK_OF(X509_LOOKUP) *sk;
 218         X509_LOOKUP *lu;
 219
 220         if(vfy == NULL)
 221             return;
 222
 223         sk=vfy->get_cert_methods;
 224         for (i=0; i<sk_X509_LOOKUP_num(sk); i++)
 225                 {
 226                 lu=sk_X509_LOOKUP_value(sk,i);
 227                 X509_LOOKUP_shutdown(lu);
 228                 X509_LOOKUP_free(lu);
 229                 }
 230         sk_X509_LOOKUP_free(sk);
 231         sk_X509_OBJECT_pop_free(vfy->objs, cleanup);
 232
 233         CRYPTO_free_ex_data(x509_store_meth,vfy,&vfy->ex_data);
 234         OPENSSL_free(vfy);
 235         }
 236
 237 X509_LOOKUP *X509_STORE_add_lookup(X509_STORE *v, X509_LOOKUP_METHOD *m)
 238         {
 239         int i;
 240         STACK_OF(X509_LOOKUP) *sk;
 241         X509_LOOKUP *lu;
 242
 243         sk=v->get_cert_methods;
 244         for (i=0; i<sk_X509_LOOKUP_num(sk); i++)
 245                 {
 246                 lu=sk_X509_LOOKUP_value(sk,i);
 247                 if (m == lu->method)
 248                         {
 249                         return(lu);
 250                         }
 251                 }
 252         /* a new one */
 253         lu=X509_LOOKUP_new(m);
 254         if (lu == NULL)
 255                 return(NULL);
 256         else
 257                 {
 258                 lu->store_ctx=v;
 259                 if (sk_X509_LOOKUP_push(v->get_cert_methods,lu))
 260                         return(lu);
 261                 else
 262                         {
 263                         X509_LOOKUP_free(lu);
 264                         return(NULL);
 265                         }
 266                 }
 267         }
 268
 269 int X509_STORE_get_by_subject(X509_STORE_CTX *vs, int type, X509_NAME *name,
 270              X509_OBJECT *ret)
 271         {
 272         X509_STORE *ctx=vs->ctx;
 273         X509_LOOKUP *lu;
 274         X509_OBJECT stmp,*tmp;
 275         int i,j;
 276
 277         tmp=X509_OBJECT_retrieve_by_subject(ctx->objs,type,name);
 278
 279         if (tmp == NULL)
 280                 {
 281                 for (i=vs->current_method; i<sk_X509_LOOKUP_num(ctx->get_cert_methods); i++)
 282                         {
 283                         lu=sk_X509_LOOKUP_value(ctx->get_cert_methods,i);
 284                         j=X509_LOOKUP_by_subject(lu,type,name,&stmp);
 285                         if (j < 0)
 286                                 {
 287                                 vs->current_method=j;
 288                                 return(j);
 289                                 }
 290                         else if (j)
 291                                 {
 292                                 tmp= &stmp;
 293                                 break;
 294                                 }
 295                         }
 296                 vs->current_method=0;
 297                 if (tmp == NULL)
 298                         return(0);
 299                 }
 300
 301 /*      if (ret->data.ptr != NULL)
 302                 X509_OBJECT_free_contents(ret); */
 303
 304         ret->type=tmp->type;
 305         ret->data.ptr=tmp->data.ptr;
 306
 307         X509_OBJECT_up_ref_count(ret);
 308
 309         return(1);
 310         }
 311
 312 int X509_STORE_add_cert(X509_STORE *ctx, X509 *x)
 313         {
 314         X509_OBJECT *obj;
 315         int ret=1;
 316
 317         if (x == NULL) return(0);
 318         obj=(X509_OBJECT *)OPENSSL_malloc(sizeof(X509_OBJECT));
 319         if (obj == NULL)
 320                 {
 321                 X509err(X509_F_X509_STORE_ADD_CERT,ERR_R_MALLOC_FAILURE);
 322                 return(0);
 323                 }
 324         obj->type=X509_LU_X509;
 325         obj->data.x509=x;
 326
 327         CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
 328
 329         X509_OBJECT_up_ref_count(obj);
 330
 331
 332         if (X509_OBJECT_retrieve_match(ctx->objs, obj))
 333                 {
 334                 X509_OBJECT_free_contents(obj);
 335                 OPENSSL_free(obj);
 336                 X509err(X509_F_X509_STORE_ADD_CERT,X509_R_CERT_ALREADY_IN_HASH_TABLE);
 337                 ret=0;
 338                 }
 339         else sk_X509_OBJECT_push(ctx->objs, obj);
 340
 341         CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 342
 343         return(ret);
 344         }
 345
 346 int X509_STORE_add_crl(X509_STORE *ctx, X509_CRL *x)
 347         {
 348         X509_OBJECT *obj;
 349         int ret=1;
 350
 351         if (x == NULL) return(0);
 352         obj=(X509_OBJECT *)OPENSSL_malloc(sizeof(X509_OBJECT));
 353         if (obj == NULL)
 354                 {
 355                 X509err(X509_F_X509_STORE_ADD_CRL,ERR_R_MALLOC_FAILURE);
 356                 return(0);
 357                 }
 358         obj->type=X509_LU_CRL;
 359         obj->data.crl=x;
 360
 361         CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
 362
 363         X509_OBJECT_up_ref_count(obj);
 364
 365         if (X509_OBJECT_retrieve_match(ctx->objs, obj))
 366                 {
 367                 X509_OBJECT_free_contents(obj);
 368                 OPENSSL_free(obj);
 369                 X509err(X509_F_X509_STORE_ADD_CRL,X509_R_CERT_ALREADY_IN_HASH_TABLE);
 370                 ret=0;
 371                 }
 372         else sk_X509_OBJECT_push(ctx->objs, obj);
 373
 374         CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 375
 376         return(ret);
 377         }
 378
 379 void X509_OBJECT_up_ref_count(X509_OBJECT *a)
 380         {
 381         switch (a->type)
 382                 {
 383         case X509_LU_X509:
 384                 CRYPTO_add(&a->data.x509->references,1,CRYPTO_LOCK_X509);
 385                 break;
 386         case X509_LU_CRL:
 387                 CRYPTO_add(&a->data.crl->references,1,CRYPTO_LOCK_X509_CRL);
 388                 break;
 389                 }
 390         }
 391
 392 void X509_OBJECT_free_contents(X509_OBJECT *a)
 393         {
 394         switch (a->type)
 395                 {
 396         case X509_LU_X509:
 397                 X509_free(a->data.x509);
 398                 break;
 399         case X509_LU_CRL:
 400                 X509_CRL_free(a->data.crl);
 401                 break;
 402                 }
 403         }
 404
 405 int X509_OBJECT_idx_by_subject(STACK_OF(X509_OBJECT) *h, int type,
 406              X509_NAME *name)
 407         {
 408         X509_OBJECT stmp;
 409         X509 x509_s;
 410         X509_CINF cinf_s;
 411         X509_CRL crl_s;
 412         X509_CRL_INFO crl_info_s;
 413
 414         stmp.type=type;
 415         switch (type)
 416                 {
 417         case X509_LU_X509:
 418                 stmp.data.x509= &x509_s;
 419                 x509_s.cert_info= &cinf_s;
 420                 cinf_s.subject=name;
 421                 break;
 422         case X509_LU_CRL:
 423                 stmp.data.crl= &crl_s;
 424                 crl_s.crl= &crl_info_s;
 425                 crl_info_s.issuer=name;
 426                 break;
 427         default:
 428                 /* abort(); */
 429                 return -1;
 430                 }
 431
 432         return sk_X509_OBJECT_find(h,&stmp);
 433         }
 434
 435 X509_OBJECT *X509_OBJECT_retrieve_by_subject(STACK_OF(X509_OBJECT) *h, int type,
 436              X509_NAME *name)
 437 {
 438         int idx;
 439         idx = X509_OBJECT_idx_by_subject(h, type, name);
 440         if(idx==-1) return NULL;
 441         return sk_X509_OBJECT_value(h, idx);
 442 }
 443
 444 X509_OBJECT *X509_OBJECT_retrieve_match(STACK_OF(X509_OBJECT) *h, X509_OBJECT *x)
 445 {
 446         int idx, i;
 447         X509_OBJECT *obj;
 448         idx = sk_X509_OBJECT_find(h, x);
 449         if(idx == -1) return NULL;
 450         if(x->type != X509_LU_X509) return sk_X509_OBJECT_value(h, idx);
 451         for(i = idx; i < sk_X509_OBJECT_num(h); i++) {
 452                 obj = sk_X509_OBJECT_value(h, i);
 453                 if(x509_object_cmp((const X509_OBJECT **)&obj, (const X509_OBJECT **)&x)) return NULL;
 454                 if((x->type != X509_LU_X509) || !X509_cmp(obj->data.x509, x->data.x509)) return obj;
 455         }
 456         return NULL;
 457 }
 458
 459
 460 /* Try to get issuer certificate from store. Due to limitations
 461  * of the API this can only retrieve a single certificate matching
 462  * a given subject name. However it will fill the cache with all
 463  * matching certificates, so we can examine the cache for all
 464  * matches.
 465  *
 466  * Return values are:
 467  *  1 lookup successful.
 468  *  0 certificate not found.
 469  * -1 some other error.
 470  */
 471
 472
 473 int X509_STORE_CTX_get1_issuer(X509 **issuer, X509_STORE_CTX *ctx, X509 *x)
 474 {
 475         X509_NAME *xn;
 476         X509_OBJECT obj, *pobj;
 477         int i, ok, idx;
 478         xn=X509_get_issuer_name(x);
 479         ok=X509_STORE_get_by_subject(ctx,X509_LU_X509,xn,&obj);
 480         if (ok != X509_LU_X509)
 481                 {
 482                 if (ok == X509_LU_RETRY)
 483                         {
 484                         X509_OBJECT_free_contents(&obj);
 485                         X509err(X509_F_X509_VERIFY_CERT,X509_R_SHOULD_RETRY);
 486                         return -1;
 487                         }
 488                 else if (ok != X509_LU_FAIL)
 489                         {
 490                         X509_OBJECT_free_contents(&obj);
 491                         /* not good :-(, break anyway */
 492                         return -1;
 493                         }
 494                 return 0;
 495                 }
 496         /* If certificate matches all OK */
 497         if(ctx->check_issued(ctx, x, obj.data.x509)) {
 498                         *issuer = obj.data.x509;
 499                         return 1;
 500         }
 501         X509_OBJECT_free_contents(&obj);
 502         /* Else find index of first matching cert */
 503         idx = X509_OBJECT_idx_by_subject(ctx->ctx->objs, X509_LU_X509, xn);
 504         /* This shouldn't normally happen since we already have one match */
 505         if(idx == -1) return 0;
 506
 507         /* Look through all matching certificates for a suitable issuer */
 508         for(i = idx; i < sk_X509_OBJECT_num(ctx->ctx->objs); i++) {
 509                 pobj = sk_X509_OBJECT_value(ctx->ctx->objs, i);
 510                 /* See if we've ran out of matches */
 511                 if(pobj->type != X509_LU_X509) return 0;
 512                 if(X509_NAME_cmp(xn, X509_get_subject_name(pobj->data.x509))) return 0;
 513                 if(ctx->check_issued(ctx, x, pobj->data.x509)) {
 514                         *issuer = pobj->data.x509;
 515                         X509_OBJECT_up_ref_count(pobj);
 516                         return 1;
 517                 }
 518         }
 519         return 0;
 520 }
 521
 522 IMPLEMENT_STACK_OF(X509_LOOKUP)
 523 IMPLEMENT_STACK_OF(X509_OBJECT)