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by_dir.c

/* crypto/x509/by_dir.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 <time.h>
#include <errno.h>

#include "cryptlib.h"

#ifndef NO_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef MAC_OS_pre_X
# include <stat.h>
#else
# include <sys/stat.h>
#endif

#include <openssl/lhash.h>
#include <openssl/x509.h>

#ifdef _WIN32
#define stat      _stat
#endif

00081 typedef struct lookup_dir_st
      {
      BUF_MEM *buffer;
      int num_dirs;
      char **dirs;
      int *dirs_type;
      int num_dirs_alloced;
      } BY_DIR;

static int dir_ctrl(X509_LOOKUP *ctx, int cmd, const char *argp, long argl,
      char **ret);
static int new_dir(X509_LOOKUP *lu);
static void free_dir(X509_LOOKUP *lu);
static int add_cert_dir(BY_DIR *ctx,const char *dir,int type);
static int get_cert_by_subject(X509_LOOKUP *xl,int type,X509_NAME *name,
      X509_OBJECT *ret);
X509_LOOKUP_METHOD x509_dir_lookup=
      {
      "Load certs from files in a directory",
      new_dir,          /* new */
      free_dir,         /* free */
      NULL,                   /* init */
      NULL,             /* shutdown */
      dir_ctrl,         /* ctrl */
      get_cert_by_subject,    /* get_by_subject */
      NULL,             /* get_by_issuer_serial */
      NULL,             /* get_by_fingerprint */
      NULL,             /* get_by_alias */
      };

X509_LOOKUP_METHOD *X509_LOOKUP_hash_dir(void)
      {
      return(&x509_dir_lookup);
      }

static int dir_ctrl(X509_LOOKUP *ctx, int cmd, const char *argp, long argl,
           char **retp)
      {
      int ret=0;
      BY_DIR *ld;
      char *dir = NULL;

      ld=(BY_DIR *)ctx->method_data;

      switch (cmd)
            {
      case X509_L_ADD_DIR:
            if (argl == X509_FILETYPE_DEFAULT)
                  {
                  dir=(char *)Getenv(X509_get_default_cert_dir_env());
                  if (dir)
                        ret=add_cert_dir(ld,dir,X509_FILETYPE_PEM);
                  else
                        ret=add_cert_dir(ld,X509_get_default_cert_dir(),
                              X509_FILETYPE_PEM);
                  if (!ret)
                        {
                        X509err(X509_F_DIR_CTRL,X509_R_LOADING_CERT_DIR);
                        }
                  }
            else
                  ret=add_cert_dir(ld,argp,(int)argl);
            break;
            }
      return(ret);
      }

static int new_dir(X509_LOOKUP *lu)
      {
      BY_DIR *a;

      if ((a=(BY_DIR *)OPENSSL_malloc(sizeof(BY_DIR))) == NULL)
            return(0);
      if ((a->buffer=BUF_MEM_new()) == NULL)
            {
            OPENSSL_free(a);
            return(0);
            }
      a->num_dirs=0;
      a->dirs=NULL;
      a->dirs_type=NULL;
      a->num_dirs_alloced=0;
      lu->method_data=(char *)a;
      return(1);
      }

static void free_dir(X509_LOOKUP *lu)
      {
      BY_DIR *a;
      int i;

      a=(BY_DIR *)lu->method_data;
      for (i=0; i<a->num_dirs; i++)
            if (a->dirs[i] != NULL) OPENSSL_free(a->dirs[i]);
      if (a->dirs != NULL) OPENSSL_free(a->dirs);
      if (a->dirs_type != NULL) OPENSSL_free(a->dirs_type);
      if (a->buffer != NULL) BUF_MEM_free(a->buffer);
      OPENSSL_free(a);
      }

static int add_cert_dir(BY_DIR *ctx, const char *dir, int type)
      {
      int j,len;
      int *ip;
      const char *s,*ss,*p;
      char **pp;

      if (dir == NULL || !*dir)
          {
          X509err(X509_F_ADD_CERT_DIR,X509_R_INVALID_DIRECTORY);
          return 0;
          }

      s=dir;
      p=s;
      for (;;p++)
            {
            if ((*p == LIST_SEPARATOR_CHAR) || (*p == '\0'))
                  {
                  ss=s;
                  s=p+1;
                  len=(int)(p-ss);
                  if (len == 0) continue;
                  for (j=0; j<ctx->num_dirs; j++)
                        if (strlen(ctx->dirs[j]) == (size_t)len &&
                            strncmp(ctx->dirs[j],ss,(unsigned int)len) == 0)
                              break;
                  if (j<ctx->num_dirs)
                        continue;
                  if (ctx->num_dirs_alloced < (ctx->num_dirs+1))
                        {
                        ctx->num_dirs_alloced+=10;
                        pp=(char **)OPENSSL_malloc(ctx->num_dirs_alloced*
                              sizeof(char *));
                        ip=(int *)OPENSSL_malloc(ctx->num_dirs_alloced*
                              sizeof(int));
                        if ((pp == NULL) || (ip == NULL))
                              {
                              X509err(X509_F_ADD_CERT_DIR,ERR_R_MALLOC_FAILURE);
                              return(0);
                              }
                        memcpy(pp,ctx->dirs,(ctx->num_dirs_alloced-10)*
                              sizeof(char *));
                        memcpy(ip,ctx->dirs_type,(ctx->num_dirs_alloced-10)*
                              sizeof(int));
                        if (ctx->dirs != NULL)
                              OPENSSL_free(ctx->dirs);
                        if (ctx->dirs_type != NULL)
                              OPENSSL_free(ctx->dirs_type);
                        ctx->dirs=pp;
                        ctx->dirs_type=ip;
                        }
                  ctx->dirs_type[ctx->num_dirs]=type;
                  ctx->dirs[ctx->num_dirs]=(char *)OPENSSL_malloc((unsigned int)len+1);
                  if (ctx->dirs[ctx->num_dirs] == NULL) return(0);
                  strncpy(ctx->dirs[ctx->num_dirs],ss,(unsigned int)len);
                  ctx->dirs[ctx->num_dirs][len]='\0';
                  ctx->num_dirs++;
                  }
            if (*p == '\0') break;
            }
      return(1);
      }

static int get_cert_by_subject(X509_LOOKUP *xl, int type, X509_NAME *name,
           X509_OBJECT *ret)
      {
      BY_DIR *ctx;
      union {
            struct      {
                  X509 st_x509;
                  X509_CINF st_x509_cinf;
                  } x509;
            struct      {
                  X509_CRL st_crl;
                  X509_CRL_INFO st_crl_info;
                  } crl;
            } data;
      int ok=0;
      int i,j,k;
      unsigned long h;
      BUF_MEM *b=NULL;
      struct stat st;
      X509_OBJECT stmp,*tmp;
      const char *postfix="";

      if (name == NULL) return(0);

      stmp.type=type;
      if (type == X509_LU_X509)
            {
            data.x509.st_x509.cert_info= &data.x509.st_x509_cinf;
            data.x509.st_x509_cinf.subject=name;
            stmp.data.x509= &data.x509.st_x509;
            postfix="";
            }
      else if (type == X509_LU_CRL)
            {
            data.crl.st_crl.crl= &data.crl.st_crl_info;
            data.crl.st_crl_info.issuer=name;
            stmp.data.crl= &data.crl.st_crl;
            postfix="r";
            }
      else
            {
            X509err(X509_F_GET_CERT_BY_SUBJECT,X509_R_WRONG_LOOKUP_TYPE);
            goto finish;
            }

      if ((b=BUF_MEM_new()) == NULL)
            {
            X509err(X509_F_GET_CERT_BY_SUBJECT,ERR_R_BUF_LIB);
            goto finish;
            }
      
      ctx=(BY_DIR *)xl->method_data;

      h=X509_NAME_hash(name);
      for (i=0; i<ctx->num_dirs; i++)
            {
            j=strlen(ctx->dirs[i])+1+8+6+1+1;
            if (!BUF_MEM_grow(b,j))
                  {
                  X509err(X509_F_GET_CERT_BY_SUBJECT,ERR_R_MALLOC_FAILURE);
                  goto finish;
                  }
            k=0;
            for (;;)
                  {
                  char c = '/';
#ifdef OPENSSL_SYS_VMS
                  c = ctx->dirs[i][strlen(ctx->dirs[i])-1];
                  if (c != ':' && c != '>' && c != ']')
                        {
                        /* If no separator is present, we assume the
                           directory specifier is a logical name, and
                           add a colon.  We really should use better
                           VMS routines for merging things like this,
                           but this will do for now...
                           -- Richard Levitte */
                        c = ':';
                        }
                  else
                        {
                        c = '\0';
                        }
#endif
                  if (c == '\0')
                        {
                        /* This is special.  When c == '\0', no
                           directory separator should be added. */
                        BIO_snprintf(b->data,b->max,
                              "%s%08lx.%s%d",ctx->dirs[i],h,
                              postfix,k);
                        }
                  else
                        {
                        BIO_snprintf(b->data,b->max,
                              "%s%c%08lx.%s%d",ctx->dirs[i],c,h,
                              postfix,k);
                        }
                  k++;
                  if (stat(b->data,&st) < 0)
                        break;
                  /* found one. */
                  if (type == X509_LU_X509)
                        {
                        if ((X509_load_cert_file(xl,b->data,
                              ctx->dirs_type[i])) == 0)
                              break;
                        }
                  else if (type == X509_LU_CRL)
                        {
                        if ((X509_load_crl_file(xl,b->data,
                              ctx->dirs_type[i])) == 0)
                              break;
                        }
                  /* else case will caught higher up */
                  }

            /* we have added it to the cache so now pull
             * it out again */
            CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
            j = sk_X509_OBJECT_find(xl->store_ctx->objs,&stmp);
            if(j != -1) tmp=sk_X509_OBJECT_value(xl->store_ctx->objs,j);
            else tmp = NULL;
            CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);

            if (tmp != NULL)
                  {
                  ok=1;
                  ret->type=tmp->type;
                  memcpy(&ret->data,&tmp->data,sizeof(ret->data));
                  /* If we were going to up the reference count,
                   * we would need to do it on a perl 'type'
                   * basis */
      /*          CRYPTO_add(&tmp->data.x509->references,1,
                        CRYPTO_LOCK_X509);*/
                  goto finish;
                  }
            }
finish:
      if (b != NULL) BUF_MEM_free(b);
      return(ok);
      }

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