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pem_info.c

/* crypto/pem/pem_info.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/buffer.h>
#include <openssl/objects.h>
#include <openssl/evp.h>
#include <openssl/x509.h>
#include <openssl/pem.h>
#ifndef OPENSSL_NO_RSA
#include <openssl/rsa.h>
#endif
#ifndef OPENSSL_NO_DSA
#include <openssl/dsa.h>
#endif

#ifndef OPENSSL_NO_FP_API
STACK_OF(X509_INFO) *PEM_X509_INFO_read(FILE *fp, STACK_OF(X509_INFO) *sk, pem_password_cb *cb, void *u)
      {
        BIO *b;
        STACK_OF(X509_INFO) *ret;

        if ((b=BIO_new(BIO_s_file())) == NULL)
            {
            PEMerr(PEM_F_PEM_X509_INFO_READ,ERR_R_BUF_LIB);
                return(0);
            }
        BIO_set_fp(b,fp,BIO_NOCLOSE);
        ret=PEM_X509_INFO_read_bio(b,sk,cb,u);
        BIO_free(b);
        return(ret);
      }
#endif

STACK_OF(X509_INFO) *PEM_X509_INFO_read_bio(BIO *bp, STACK_OF(X509_INFO) *sk, pem_password_cb *cb, void *u)
      {
      X509_INFO *xi=NULL;
      char *name=NULL,*header=NULL;
      void *pp;
      unsigned char *data=NULL;
      const unsigned char *p;
      long len,error=0;
      int ok=0;
      STACK_OF(X509_INFO) *ret=NULL;
      unsigned int i,raw;
      d2i_of_void *d2i;

      if (sk == NULL)
            {
            if ((ret=sk_X509_INFO_new_null()) == NULL)
                  {
                  PEMerr(PEM_F_PEM_X509_INFO_READ_BIO,ERR_R_MALLOC_FAILURE);
                  goto err;
                  }
            }
      else
            ret=sk;

      if ((xi=X509_INFO_new()) == NULL) goto err;
      for (;;)
            {
            raw=0;
            i=PEM_read_bio(bp,&name,&header,&data,&len);
            if (i == 0)
                  {
                  error=ERR_GET_REASON(ERR_peek_last_error());
                  if (error == PEM_R_NO_START_LINE)
                        {
                        ERR_clear_error();
                        break;
                        }
                  goto err;
                  }
start:
            if (  (strcmp(name,PEM_STRING_X509) == 0) ||
                  (strcmp(name,PEM_STRING_X509_OLD) == 0))
                  {
                  d2i=(D2I_OF(void))d2i_X509;
                  if (xi->x509 != NULL)
                        {
                        if (!sk_X509_INFO_push(ret,xi)) goto err;
                        if ((xi=X509_INFO_new()) == NULL) goto err;
                        goto start;
                        }
                  pp=&(xi->x509);
                  }
            else if ((strcmp(name,PEM_STRING_X509_TRUSTED) == 0))
                  {
                  d2i=(D2I_OF(void))d2i_X509_AUX;
                  if (xi->x509 != NULL)
                        {
                        if (!sk_X509_INFO_push(ret,xi)) goto err;
                        if ((xi=X509_INFO_new()) == NULL) goto err;
                        goto start;
                        }
                  pp=&(xi->x509);
                  }
            else if (strcmp(name,PEM_STRING_X509_CRL) == 0)
                  {
                  d2i=(D2I_OF(void))d2i_X509_CRL;
                  if (xi->crl != NULL)
                        {
                        if (!sk_X509_INFO_push(ret,xi)) goto err;
                        if ((xi=X509_INFO_new()) == NULL) goto err;
                        goto start;
                        }
                  pp=&(xi->crl);
                  }
            else
#ifndef OPENSSL_NO_RSA
                  if (strcmp(name,PEM_STRING_RSA) == 0)
                  {
                  d2i=(D2I_OF(void))d2i_RSAPrivateKey;
                  if (xi->x_pkey != NULL) 
                        {
                        if (!sk_X509_INFO_push(ret,xi)) goto err;
                        if ((xi=X509_INFO_new()) == NULL) goto err;
                        goto start;
                        }

                  xi->enc_data=NULL;
                  xi->enc_len=0;

                  xi->x_pkey=X509_PKEY_new();
                  if ((xi->x_pkey->dec_pkey=EVP_PKEY_new()) == NULL)
                        goto err;
                  xi->x_pkey->dec_pkey->type=EVP_PKEY_RSA;
                  pp=&(xi->x_pkey->dec_pkey->pkey.rsa);
                  if ((int)strlen(header) > 10) /* assume encrypted */
                        raw=1;
                  }
            else
#endif
#ifndef OPENSSL_NO_DSA
                  if (strcmp(name,PEM_STRING_DSA) == 0)
                  {
                  d2i=(D2I_OF(void))d2i_DSAPrivateKey;
                  if (xi->x_pkey != NULL) 
                        {
                        if (!sk_X509_INFO_push(ret,xi)) goto err;
                        if ((xi=X509_INFO_new()) == NULL) goto err;
                        goto start;
                        }

                  xi->enc_data=NULL;
                  xi->enc_len=0;

                  xi->x_pkey=X509_PKEY_new();
                  if ((xi->x_pkey->dec_pkey=EVP_PKEY_new()) == NULL)
                        goto err;
                  xi->x_pkey->dec_pkey->type=EVP_PKEY_DSA;
                  pp=&xi->x_pkey->dec_pkey->pkey.dsa;
                  if ((int)strlen(header) > 10) /* assume encrypted */
                        raw=1;
                  }
            else
#endif
#ifndef OPENSSL_NO_EC
                  if (strcmp(name,PEM_STRING_ECPRIVATEKEY) == 0)
                  {
                        d2i=(D2I_OF(void))d2i_ECPrivateKey;
                        if (xi->x_pkey != NULL) 
                        {
                              if (!sk_X509_INFO_push(ret,xi)) goto err;
                              if ((xi=X509_INFO_new()) == NULL) goto err;
                                    goto start;
                        }
 
                  xi->enc_data=NULL;
                  xi->enc_len=0;
 
                  xi->x_pkey=X509_PKEY_new();
                  if ((xi->x_pkey->dec_pkey=EVP_PKEY_new()) == NULL)
                        goto err;
                  xi->x_pkey->dec_pkey->type=EVP_PKEY_EC;
                  pp=&(xi->x_pkey->dec_pkey->pkey.ec);
                  if ((int)strlen(header) > 10) /* assume encrypted */
                        raw=1;
                  }
            else
#endif
                  {
                  d2i=NULL;
                  pp=NULL;
                  }

            if (d2i != NULL)
                  {
                  if (!raw)
                        {
                        EVP_CIPHER_INFO cipher;

                        if (!PEM_get_EVP_CIPHER_INFO(header,&cipher))
                              goto err;
                        if (!PEM_do_header(&cipher,data,&len,cb,u))
                              goto err;
                        p=data;
                        if (d2i(pp,&p,len) == NULL)
                              {
                              PEMerr(PEM_F_PEM_X509_INFO_READ_BIO,ERR_R_ASN1_LIB);
                              goto err;
                              }
                        }
                  else
                        { /* encrypted RSA data */
                        if (!PEM_get_EVP_CIPHER_INFO(header,
                              &xi->enc_cipher)) goto err;
                        xi->enc_data=(char *)data;
                        xi->enc_len=(int)len;
                        data=NULL;
                        }
                  }
            else  {
                  /* unknown */
                  }
            if (name != NULL) OPENSSL_free(name);
            if (header != NULL) OPENSSL_free(header);
            if (data != NULL) OPENSSL_free(data);
            name=NULL;
            header=NULL;
            data=NULL;
            }

      /* if the last one hasn't been pushed yet and there is anything
       * in it then add it to the stack ... 
       */
      if ((xi->x509 != NULL) || (xi->crl != NULL) ||
            (xi->x_pkey != NULL) || (xi->enc_data != NULL))
            {
            if (!sk_X509_INFO_push(ret,xi)) goto err;
            xi=NULL;
            }
      ok=1;
err:
      if (xi != NULL) X509_INFO_free(xi);
      if (!ok)
            {
            for (i=0; ((int)i)<sk_X509_INFO_num(ret); i++)
                  {
                  xi=sk_X509_INFO_value(ret,i);
                  X509_INFO_free(xi);
                  }
            if (ret != sk) sk_X509_INFO_free(ret);
            ret=NULL;
            }
            
      if (name != NULL) OPENSSL_free(name);
      if (header != NULL) OPENSSL_free(header);
      if (data != NULL) OPENSSL_free(data);
      return(ret);
      }


/* A TJH addition */
int PEM_X509_INFO_write_bio(BIO *bp, X509_INFO *xi, EVP_CIPHER *enc,
           unsigned char *kstr, int klen, pem_password_cb *cb, void *u)
      {
      EVP_CIPHER_CTX ctx;
      int i,ret=0;
      unsigned char *data=NULL;
      const char *objstr=NULL;
      char buf[PEM_BUFSIZE];
      unsigned char *iv=NULL;
      
      if (enc != NULL)
            {
            objstr=OBJ_nid2sn(EVP_CIPHER_nid(enc));
            if (objstr == NULL)
                  {
                  PEMerr(PEM_F_PEM_X509_INFO_WRITE_BIO,PEM_R_UNSUPPORTED_CIPHER);
                  goto err;
                  }
            }

      /* now for the fun part ... if we have a private key then 
       * we have to be able to handle a not-yet-decrypted key
       * being written out correctly ... if it is decrypted or
       * it is non-encrypted then we use the base code
       */
      if (xi->x_pkey!=NULL)
            {
            if ( (xi->enc_data!=NULL) && (xi->enc_len>0) )
                  {
                  /* copy from weirdo names into more normal things */
                  iv=xi->enc_cipher.iv;
                  data=(unsigned char *)xi->enc_data;
                  i=xi->enc_len;

                  /* we take the encryption data from the
                   * internal stuff rather than what the
                   * user has passed us ... as we have to 
                   * match exactly for some strange reason
                   */
                  objstr=OBJ_nid2sn(
                        EVP_CIPHER_nid(xi->enc_cipher.cipher));
                  if (objstr == NULL)
                        {
                        PEMerr(PEM_F_PEM_X509_INFO_WRITE_BIO,PEM_R_UNSUPPORTED_CIPHER);
                        goto err;
                        }

                  /* create the right magic header stuff */
                  OPENSSL_assert(strlen(objstr)+23+2*enc->iv_len+13 <= sizeof buf);
                  buf[0]='\0';
                  PEM_proc_type(buf,PEM_TYPE_ENCRYPTED);
                  PEM_dek_info(buf,objstr,enc->iv_len,(char *)iv);

                  /* use the normal code to write things out */
                  i=PEM_write_bio(bp,PEM_STRING_RSA,buf,data,i);
                  if (i <= 0) goto err;
                  }
            else
                  {
                  /* Add DSA/DH */
#ifndef OPENSSL_NO_RSA
                  /* normal optionally encrypted stuff */
                  if (PEM_write_bio_RSAPrivateKey(bp,
                        xi->x_pkey->dec_pkey->pkey.rsa,
                        enc,kstr,klen,cb,u)<=0)
                        goto err;
#endif
                  }
            }

      /* if we have a certificate then write it out now */
      if ((xi->x509 != NULL) && (PEM_write_bio_X509(bp,xi->x509) <= 0))
            goto err;

      /* we are ignoring anything else that is loaded into the X509_INFO
       * structure for the moment ... as I don't need it so I'm not
       * coding it here and Eric can do it when this makes it into the
       * base library --tjh
       */

      ret=1;

err:
      OPENSSL_cleanse((char *)&ctx,sizeof(ctx));
      OPENSSL_cleanse(buf,PEM_BUFSIZE);
      return(ret);
      }

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