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x509_lu.c

/* crypto/x509/x509_lu.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 "cryptlib.h"
#include <openssl/lhash.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>

X509_LOOKUP *X509_LOOKUP_new(X509_LOOKUP_METHOD *method)
      {
      X509_LOOKUP *ret;

      ret=(X509_LOOKUP *)OPENSSL_malloc(sizeof(X509_LOOKUP));
      if (ret == NULL) return NULL;

      ret->init=0;
      ret->skip=0;
      ret->method=method;
      ret->method_data=NULL;
      ret->store_ctx=NULL;
      if ((method->new_item != NULL) && !method->new_item(ret))
            {
            OPENSSL_free(ret);
            return NULL;
            }
      return ret;
      }

void X509_LOOKUP_free(X509_LOOKUP *ctx)
      {
      if (ctx == NULL) return;
      if (  (ctx->method != NULL) &&
            (ctx->method->free != NULL))
            ctx->method->free(ctx);
      OPENSSL_free(ctx);
      }

int X509_LOOKUP_init(X509_LOOKUP *ctx)
      {
      if (ctx->method == NULL) return 0;
      if (ctx->method->init != NULL)
            return ctx->method->init(ctx);
      else
            return 1;
      }

int X509_LOOKUP_shutdown(X509_LOOKUP *ctx)
      {
      if (ctx->method == NULL) return 0;
      if (ctx->method->shutdown != NULL)
            return ctx->method->shutdown(ctx);
      else
            return 1;
      }

int X509_LOOKUP_ctrl(X509_LOOKUP *ctx, int cmd, const char *argc, long argl,
           char **ret)
      {
      if (ctx->method == NULL) return -1;
      if (ctx->method->ctrl != NULL)
            return ctx->method->ctrl(ctx,cmd,argc,argl,ret);
      else
            return 1;
      }

int X509_LOOKUP_by_subject(X509_LOOKUP *ctx, int type, X509_NAME *name,
           X509_OBJECT *ret)
      {
      if ((ctx->method == NULL) || (ctx->method->get_by_subject == NULL))
            return X509_LU_FAIL;
      if (ctx->skip) return 0;
      return ctx->method->get_by_subject(ctx,type,name,ret);
      }

int X509_LOOKUP_by_issuer_serial(X509_LOOKUP *ctx, int type, X509_NAME *name,
           ASN1_INTEGER *serial, X509_OBJECT *ret)
      {
      if ((ctx->method == NULL) ||
            (ctx->method->get_by_issuer_serial == NULL))
            return X509_LU_FAIL;
      return ctx->method->get_by_issuer_serial(ctx,type,name,serial,ret);
      }

int X509_LOOKUP_by_fingerprint(X509_LOOKUP *ctx, int type,
           unsigned char *bytes, int len, X509_OBJECT *ret)
      {
      if ((ctx->method == NULL) || (ctx->method->get_by_fingerprint == NULL))
            return X509_LU_FAIL;
      return ctx->method->get_by_fingerprint(ctx,type,bytes,len,ret);
      }

int X509_LOOKUP_by_alias(X509_LOOKUP *ctx, int type, char *str, int len,
           X509_OBJECT *ret)
      {
      if ((ctx->method == NULL) || (ctx->method->get_by_alias == NULL))
            return X509_LU_FAIL;
      return ctx->method->get_by_alias(ctx,type,str,len,ret);
      }

  
static int x509_object_cmp(const X509_OBJECT * const *a, const X509_OBJECT * const *b)
      {
      int ret;

      ret=((*a)->type - (*b)->type);
      if (ret) return ret;
      switch ((*a)->type)
            {
      case X509_LU_X509:
            ret=X509_subject_name_cmp((*a)->data.x509,(*b)->data.x509);
            break;
      case X509_LU_CRL:
            ret=X509_CRL_cmp((*a)->data.crl,(*b)->data.crl);
            break;
      default:
            /* abort(); */
            return 0;
            }
      return ret;
      }

X509_STORE *X509_STORE_new(void)
      {
      X509_STORE *ret;

      if ((ret=(X509_STORE *)OPENSSL_malloc(sizeof(X509_STORE))) == NULL)
            return NULL;
      ret->objs = sk_X509_OBJECT_new(x509_object_cmp);
      ret->cache=1;
      ret->get_cert_methods=sk_X509_LOOKUP_new_null();
      ret->verify=0;
      ret->verify_cb=0;

      if ((ret->param = X509_VERIFY_PARAM_new()) == NULL)
            return NULL;

      ret->get_issuer = 0;
      ret->check_issued = 0;
      ret->check_revocation = 0;
      ret->get_crl = 0;
      ret->check_crl = 0;
      ret->cert_crl = 0;
      ret->cleanup = 0;

      CRYPTO_new_ex_data(CRYPTO_EX_INDEX_X509_STORE, ret, &ret->ex_data);
      ret->references=1;
      return ret;
      }

static void cleanup(X509_OBJECT *a)
      {
      if (a->type == X509_LU_X509)
            {
            X509_free(a->data.x509);
            }
      else if (a->type == X509_LU_CRL)
            {
            X509_CRL_free(a->data.crl);
            }
      else
            {
            /* abort(); */
            }

      OPENSSL_free(a);
      }

void X509_STORE_free(X509_STORE *vfy)
      {
      int i;
      STACK_OF(X509_LOOKUP) *sk;
      X509_LOOKUP *lu;

      if (vfy == NULL)
          return;

      sk=vfy->get_cert_methods;
      for (i=0; i<sk_X509_LOOKUP_num(sk); i++)
            {
            lu=sk_X509_LOOKUP_value(sk,i);
            X509_LOOKUP_shutdown(lu);
            X509_LOOKUP_free(lu);
            }
      sk_X509_LOOKUP_free(sk);
      sk_X509_OBJECT_pop_free(vfy->objs, cleanup);

      CRYPTO_free_ex_data(CRYPTO_EX_INDEX_X509_STORE, vfy, &vfy->ex_data);
      if (vfy->param)
            X509_VERIFY_PARAM_free(vfy->param);
      OPENSSL_free(vfy);
      }

X509_LOOKUP *X509_STORE_add_lookup(X509_STORE *v, X509_LOOKUP_METHOD *m)
      {
      int i;
      STACK_OF(X509_LOOKUP) *sk;
      X509_LOOKUP *lu;

      sk=v->get_cert_methods;
      for (i=0; i<sk_X509_LOOKUP_num(sk); i++)
            {
            lu=sk_X509_LOOKUP_value(sk,i);
            if (m == lu->method)
                  {
                  return lu;
                  }
            }
      /* a new one */
      lu=X509_LOOKUP_new(m);
      if (lu == NULL)
            return NULL;
      else
            {
            lu->store_ctx=v;
            if (sk_X509_LOOKUP_push(v->get_cert_methods,lu))
                  return lu;
            else
                  {
                  X509_LOOKUP_free(lu);
                  return NULL;
                  }
            }
      }

int X509_STORE_get_by_subject(X509_STORE_CTX *vs, int type, X509_NAME *name,
           X509_OBJECT *ret)
      {
      X509_STORE *ctx=vs->ctx;
      X509_LOOKUP *lu;
      X509_OBJECT stmp,*tmp;
      int i,j;

      tmp=X509_OBJECT_retrieve_by_subject(ctx->objs,type,name);

      if (tmp == NULL)
            {
            for (i=vs->current_method; i<sk_X509_LOOKUP_num(ctx->get_cert_methods); i++)
                  {
                  lu=sk_X509_LOOKUP_value(ctx->get_cert_methods,i);
                  j=X509_LOOKUP_by_subject(lu,type,name,&stmp);
                  if (j < 0)
                        {
                        vs->current_method=j;
                        return j;
                        }
                  else if (j)
                        {
                        tmp= &stmp;
                        break;
                        }
                  }
            vs->current_method=0;
            if (tmp == NULL)
                  return 0;
            }

/*    if (ret->data.ptr != NULL)
            X509_OBJECT_free_contents(ret); */

      ret->type=tmp->type;
      ret->data.ptr=tmp->data.ptr;

      X509_OBJECT_up_ref_count(ret);

      return 1;
      }

int X509_STORE_add_cert(X509_STORE *ctx, X509 *x)
      {
      X509_OBJECT *obj;
      int ret=1;

      if (x == NULL) return 0;
      obj=(X509_OBJECT *)OPENSSL_malloc(sizeof(X509_OBJECT));
      if (obj == NULL)
            {
            X509err(X509_F_X509_STORE_ADD_CERT,ERR_R_MALLOC_FAILURE);
            return 0;
            }
      obj->type=X509_LU_X509;
      obj->data.x509=x;

      CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);

      X509_OBJECT_up_ref_count(obj);


      if (X509_OBJECT_retrieve_match(ctx->objs, obj))
            {
            X509_OBJECT_free_contents(obj);
            OPENSSL_free(obj);
            X509err(X509_F_X509_STORE_ADD_CERT,X509_R_CERT_ALREADY_IN_HASH_TABLE);
            ret=0;
            } 
      else sk_X509_OBJECT_push(ctx->objs, obj);

      CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);

      return ret;
      }

int X509_STORE_add_crl(X509_STORE *ctx, X509_CRL *x)
      {
      X509_OBJECT *obj;
      int ret=1;

      if (x == NULL) return 0;
      obj=(X509_OBJECT *)OPENSSL_malloc(sizeof(X509_OBJECT));
      if (obj == NULL)
            {
            X509err(X509_F_X509_STORE_ADD_CRL,ERR_R_MALLOC_FAILURE);
            return 0;
            }
      obj->type=X509_LU_CRL;
      obj->data.crl=x;

      CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);

      X509_OBJECT_up_ref_count(obj);

      if (X509_OBJECT_retrieve_match(ctx->objs, obj))
            {
            X509_OBJECT_free_contents(obj);
            OPENSSL_free(obj);
            X509err(X509_F_X509_STORE_ADD_CRL,X509_R_CERT_ALREADY_IN_HASH_TABLE);
            ret=0;
            }
      else sk_X509_OBJECT_push(ctx->objs, obj);

      CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);

      return ret;
      }

void X509_OBJECT_up_ref_count(X509_OBJECT *a)
      {
      switch (a->type)
            {
      case X509_LU_X509:
            CRYPTO_add(&a->data.x509->references,1,CRYPTO_LOCK_X509);
            break;
      case X509_LU_CRL:
            CRYPTO_add(&a->data.crl->references,1,CRYPTO_LOCK_X509_CRL);
            break;
            }
      }

void X509_OBJECT_free_contents(X509_OBJECT *a)
      {
      switch (a->type)
            {
      case X509_LU_X509:
            X509_free(a->data.x509);
            break;
      case X509_LU_CRL:
            X509_CRL_free(a->data.crl);
            break;
            }
      }

int X509_OBJECT_idx_by_subject(STACK_OF(X509_OBJECT) *h, int type,
           X509_NAME *name)
      {
      X509_OBJECT stmp;
      X509 x509_s;
      X509_CINF cinf_s;
      X509_CRL crl_s;
      X509_CRL_INFO crl_info_s;

      stmp.type=type;
      switch (type)
            {
      case X509_LU_X509:
            stmp.data.x509= &x509_s;
            x509_s.cert_info= &cinf_s;
            cinf_s.subject=name;
            break;
      case X509_LU_CRL:
            stmp.data.crl= &crl_s;
            crl_s.crl= &crl_info_s;
            crl_info_s.issuer=name;
            break;
      default:
            /* abort(); */
            return -1;
            }

      return sk_X509_OBJECT_find(h,&stmp);
      }

X509_OBJECT *X509_OBJECT_retrieve_by_subject(STACK_OF(X509_OBJECT) *h, int type,
           X509_NAME *name)
{
      int idx;
      idx = X509_OBJECT_idx_by_subject(h, type, name);
      if (idx==-1) return NULL;
      return sk_X509_OBJECT_value(h, idx);
}

X509_OBJECT *X509_OBJECT_retrieve_match(STACK_OF(X509_OBJECT) *h, X509_OBJECT *x)
{
      int idx, i;
      X509_OBJECT *obj;
      idx = sk_X509_OBJECT_find(h, x);
      if (idx == -1) return NULL;
      if (x->type != X509_LU_X509) return sk_X509_OBJECT_value(h, idx);
      for (i = idx; i < sk_X509_OBJECT_num(h); i++)
            {
            obj = sk_X509_OBJECT_value(h, i);
            if (x509_object_cmp((const X509_OBJECT **)&obj, (const X509_OBJECT **)&x))
                  return NULL;
            if ((x->type != X509_LU_X509) || !X509_cmp(obj->data.x509, x->data.x509))
                  return obj;
            }
      return NULL;
}


/* Try to get issuer certificate from store. Due to limitations
 * of the API this can only retrieve a single certificate matching
 * a given subject name. However it will fill the cache with all
 * matching certificates, so we can examine the cache for all 
 * matches.
 *
 * Return values are:
 *  1 lookup successful.
 *  0 certificate not found.
 * -1 some other error.
 */


int X509_STORE_CTX_get1_issuer(X509 **issuer, X509_STORE_CTX *ctx, X509 *x)
{
      X509_NAME *xn;
      X509_OBJECT obj, *pobj;
      int i, ok, idx;
      xn=X509_get_issuer_name(x);
      ok=X509_STORE_get_by_subject(ctx,X509_LU_X509,xn,&obj);
      if (ok != X509_LU_X509)
            {
            if (ok == X509_LU_RETRY)
                  {
                  X509_OBJECT_free_contents(&obj);
                  X509err(X509_F_X509_STORE_CTX_GET1_ISSUER,X509_R_SHOULD_RETRY);
                  return -1;
                  }
            else if (ok != X509_LU_FAIL)
                  {
                  X509_OBJECT_free_contents(&obj);
                  /* not good :-(, break anyway */
                  return -1;
                  }
            return 0;
            }
      /* If certificate matches all OK */
      if (ctx->check_issued(ctx, x, obj.data.x509))
            {
            *issuer = obj.data.x509;
            return 1;
            }
      X509_OBJECT_free_contents(&obj);
      /* Else find index of first matching cert */
      idx = X509_OBJECT_idx_by_subject(ctx->ctx->objs, X509_LU_X509, xn);
      /* This shouldn't normally happen since we already have one match */
      if (idx == -1) return 0;

      /* Look through all matching certificates for a suitable issuer */
      for (i = idx; i < sk_X509_OBJECT_num(ctx->ctx->objs); i++)
            {
            pobj = sk_X509_OBJECT_value(ctx->ctx->objs, i);
            /* See if we've ran out of matches */
            if (pobj->type != X509_LU_X509) return 0;
            if (X509_NAME_cmp(xn, X509_get_subject_name(pobj->data.x509))) return 0;
            if (ctx->check_issued(ctx, x, pobj->data.x509))
                  {
                  *issuer = pobj->data.x509;
                  X509_OBJECT_up_ref_count(pobj);
                  return 1;
                  }
            }
      return 0;
}

int X509_STORE_set_flags(X509_STORE *ctx, unsigned long flags)
      {
      return X509_VERIFY_PARAM_set_flags(ctx->param, flags);
      }

int X509_STORE_set_depth(X509_STORE *ctx, int depth)
      {
      X509_VERIFY_PARAM_set_depth(ctx->param, depth);
      return 1;
      }

int X509_STORE_set_purpose(X509_STORE *ctx, int purpose)
      {
      return X509_VERIFY_PARAM_set_purpose(ctx->param, purpose);
      }

int X509_STORE_set_trust(X509_STORE *ctx, int trust)
      {
      return X509_VERIFY_PARAM_set_trust(ctx->param, trust);
      }

int X509_STORE_set1_param(X509_STORE *ctx, X509_VERIFY_PARAM *param)
      {
      return X509_VERIFY_PARAM_set1(ctx->param, param);
      }

IMPLEMENT_STACK_OF(X509_LOOKUP)
IMPLEMENT_STACK_OF(X509_OBJECT)

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