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asn1_par.c

/* crypto/asn1/asn1_par.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/asn1.h>

static int asn1_print_info(BIO *bp, int tag, int xclass,int constructed,
      int indent);
static int asn1_parse2(BIO *bp, const unsigned char **pp, long length,
      int offset, int depth, int indent, int dump);
static int asn1_print_info(BIO *bp, int tag, int xclass, int constructed,
           int indent)
      {
      static const char fmt[]="%-18s";
      static const char fmt2[]="%2d %-15s";
      char str[128];
      const char *p,*p2=NULL;

      if (constructed & V_ASN1_CONSTRUCTED)
            p="cons: ";
      else
            p="prim: ";
      if (BIO_write(bp,p,6) < 6) goto err;
      BIO_indent(bp,indent,128);

      p=str;
      if ((xclass & V_ASN1_PRIVATE) == V_ASN1_PRIVATE)
            BIO_snprintf(str,sizeof str,"priv [ %d ] ",tag);
      else if ((xclass & V_ASN1_CONTEXT_SPECIFIC) == V_ASN1_CONTEXT_SPECIFIC)
            BIO_snprintf(str,sizeof str,"cont [ %d ]",tag);
      else if ((xclass & V_ASN1_APPLICATION) == V_ASN1_APPLICATION)
            BIO_snprintf(str,sizeof str,"appl [ %d ]",tag);
      else if (tag > 30)
            BIO_snprintf(str,sizeof str,"<ASN1 %d>",tag);
      else
            p = ASN1_tag2str(tag);

      if (p2 != NULL)
            {
            if (BIO_printf(bp,fmt2,tag,p2) <= 0) goto err;
            }
      else
            {
            if (BIO_printf(bp,fmt,p) <= 0) goto err;
            }
      return(1);
err:
      return(0);
      }

int ASN1_parse(BIO *bp, const unsigned char *pp, long len, int indent)
      {
      return(asn1_parse2(bp,&pp,len,0,0,indent,0));
      }

int ASN1_parse_dump(BIO *bp, const unsigned char *pp, long len, int indent, int dump)
      {
      return(asn1_parse2(bp,&pp,len,0,0,indent,dump));
      }

static int asn1_parse2(BIO *bp, const unsigned char **pp, long length, int offset,
           int depth, int indent, int dump)
      {
      const unsigned char *p,*ep,*tot,*op,*opp;
      long len;
      int tag,xclass,ret=0;
      int nl,hl,j,r;
      ASN1_OBJECT *o=NULL;
      ASN1_OCTET_STRING *os=NULL;
      /* ASN1_BMPSTRING *bmp=NULL;*/
      int dump_indent;

#if 0
      dump_indent = indent;
#else
      dump_indent = 6;  /* Because we know BIO_dump_indent() */
#endif
      p= *pp;
      tot=p+length;
      op=p-1;
      while ((p < tot) && (op < p))
            {
            op=p;
            j=ASN1_get_object(&p,&len,&tag,&xclass,length);
#ifdef LINT
            j=j;
#endif
            if (j & 0x80)
                  {
                  if (BIO_write(bp,"Error in encoding\n",18) <= 0)
                        goto end;
                  ret=0;
                  goto end;
                  }
            hl=(p-op);
            length-=hl;
            /* if j == 0x21 it is a constructed indefinite length object */
            if (BIO_printf(bp,"%5ld:",(long)offset+(long)(op- *pp))
                  <= 0) goto end;

            if (j != (V_ASN1_CONSTRUCTED | 1))
                  {
                  if (BIO_printf(bp,"d=%-2d hl=%ld l=%4ld ",
                        depth,(long)hl,len) <= 0)
                        goto end;
                  }
            else
                  {
                  if (BIO_printf(bp,"d=%-2d hl=%ld l=inf  ",
                        depth,(long)hl) <= 0)
                        goto end;
                  }
            if (!asn1_print_info(bp,tag,xclass,j,(indent)?depth:0))
                  goto end;
            if (j & V_ASN1_CONSTRUCTED)
                  {
                  ep=p+len;
                  if (BIO_write(bp,"\n",1) <= 0) goto end;
                  if (len > length)
                        {
                        BIO_printf(bp,
                              "length is greater than %ld\n",length);
                        ret=0;
                        goto end;
                        }
                  if ((j == 0x21) && (len == 0))
                        {
                        for (;;)
                              {
                              r=asn1_parse2(bp,&p,(long)(tot-p),
                                    offset+(p - *pp),depth+1,
                                    indent,dump);
                              if (r == 0) { ret=0; goto end; }
                              if ((r == 2) || (p >= tot)) break;
                              }
                        }
                  else
                        while (p < ep)
                              {
                              r=asn1_parse2(bp,&p,(long)len,
                                    offset+(p - *pp),depth+1,
                                    indent,dump);
                              if (r == 0) { ret=0; goto end; }
                              }
                  }
            else if (xclass != 0)
                  {
                  p+=len;
                  if (BIO_write(bp,"\n",1) <= 0) goto end;
                  }
            else
                  {
                  nl=0;
                  if (  (tag == V_ASN1_PRINTABLESTRING) ||
                        (tag == V_ASN1_T61STRING) ||
                        (tag == V_ASN1_IA5STRING) ||
                        (tag == V_ASN1_VISIBLESTRING) ||
                        (tag == V_ASN1_NUMERICSTRING) ||
                        (tag == V_ASN1_UTF8STRING) ||
                        (tag == V_ASN1_UTCTIME) ||
                        (tag == V_ASN1_GENERALIZEDTIME))
                        {
                        if (BIO_write(bp,":",1) <= 0) goto end;
                        if ((len > 0) &&
                              BIO_write(bp,(const char *)p,(int)len)
                              != (int)len)
                              goto end;
                        }
                  else if (tag == V_ASN1_OBJECT)
                        {
                        opp=op;
                        if (d2i_ASN1_OBJECT(&o,&opp,len+hl) != NULL)
                              {
                              if (BIO_write(bp,":",1) <= 0) goto end;
                              i2a_ASN1_OBJECT(bp,o);
                              }
                        else
                              {
                              if (BIO_write(bp,":BAD OBJECT",11) <= 0)
                                    goto end;
                              }
                        }
                  else if (tag == V_ASN1_BOOLEAN)
                        {
                        int ii;

                        opp=op;
                        ii=d2i_ASN1_BOOLEAN(NULL,&opp,len+hl);
                        if (ii < 0)
                              {
                              if (BIO_write(bp,"Bad boolean\n",12) <= 0)
                                    goto end;
                              }
                        BIO_printf(bp,":%d",ii);
                        }
                  else if (tag == V_ASN1_BMPSTRING)
                        {
                        /* do the BMP thang */
                        }
                  else if (tag == V_ASN1_OCTET_STRING)
                        {
                        int i,printable=1;

                        opp=op;
                        os=d2i_ASN1_OCTET_STRING(NULL,&opp,len+hl);
                        if (os != NULL && os->length > 0)
                              {
                              opp = os->data;
                              /* testing whether the octet string is
                               * printable */
                              for (i=0; i<os->length; i++)
                                    {
                                    if (( (opp[i] < ' ') &&
                                          (opp[i] != '\n') &&
                                          (opp[i] != '\r') &&
                                          (opp[i] != '\t')) ||
                                          (opp[i] > '~'))
                                          {
                                          printable=0;
                                          break;
                                          }
                                    }
                              if (printable)
                              /* printable string */
                                    {
                                    if (BIO_write(bp,":",1) <= 0)
                                          goto end;
                                    if (BIO_write(bp,(const char *)opp,
                                          os->length) <= 0)
                                          goto end;
                                    }
                              else if (!dump)
                              /* not printable => print octet string
                               * as hex dump */
                                    {
                                    if (BIO_write(bp,"[HEX DUMP]:",11) <= 0)
                                          goto end;
                                    for (i=0; i<os->length; i++)
                                          {
                                          if (BIO_printf(bp,"%02X"
                                                , opp[i]) <= 0)
                                                goto end;
                                          }
                                    }
                              else
                              /* print the normal dump */
                                    {
                                    if (!nl) 
                                          {
                                          if (BIO_write(bp,"\n",1) <= 0)
                                                goto end;
                                          }
                                    if (BIO_dump_indent(bp,
                                          (const char *)opp,
                                          ((dump == -1 || dump > 
                                          os->length)?os->length:dump),
                                          dump_indent) <= 0)
                                          goto end;
                                    nl=1;
                                    }
                              }
                        if (os != NULL)
                              {
                              M_ASN1_OCTET_STRING_free(os);
                              os=NULL;
                              }
                        }
                  else if (tag == V_ASN1_INTEGER)
                        {
                        ASN1_INTEGER *bs;
                        int i;

                        opp=op;
                        bs=d2i_ASN1_INTEGER(NULL,&opp,len+hl);
                        if (bs != NULL)
                              {
                              if (BIO_write(bp,":",1) <= 0) goto end;
                              if (bs->type == V_ASN1_NEG_INTEGER)
                                    if (BIO_write(bp,"-",1) <= 0)
                                          goto end;
                              for (i=0; i<bs->length; i++)
                                    {
                                    if (BIO_printf(bp,"%02X",
                                          bs->data[i]) <= 0)
                                          goto end;
                                    }
                              if (bs->length == 0)
                                    {
                                    if (BIO_write(bp,"00",2) <= 0)
                                          goto end;
                                    }
                              }
                        else
                              {
                              if (BIO_write(bp,"BAD INTEGER",11) <= 0)
                                    goto end;
                              }
                        M_ASN1_INTEGER_free(bs);
                        }
                  else if (tag == V_ASN1_ENUMERATED)
                        {
                        ASN1_ENUMERATED *bs;
                        int i;

                        opp=op;
                        bs=d2i_ASN1_ENUMERATED(NULL,&opp,len+hl);
                        if (bs != NULL)
                              {
                              if (BIO_write(bp,":",1) <= 0) goto end;
                              if (bs->type == V_ASN1_NEG_ENUMERATED)
                                    if (BIO_write(bp,"-",1) <= 0)
                                          goto end;
                              for (i=0; i<bs->length; i++)
                                    {
                                    if (BIO_printf(bp,"%02X",
                                          bs->data[i]) <= 0)
                                          goto end;
                                    }
                              if (bs->length == 0)
                                    {
                                    if (BIO_write(bp,"00",2) <= 0)
                                          goto end;
                                    }
                              }
                        else
                              {
                              if (BIO_write(bp,"BAD ENUMERATED",11) <= 0)
                                    goto end;
                              }
                        M_ASN1_ENUMERATED_free(bs);
                        }
                  else if (len > 0 && dump)
                        {
                        if (!nl) 
                              {
                              if (BIO_write(bp,"\n",1) <= 0)
                                    goto end;
                              }
                        if (BIO_dump_indent(bp,(const char *)p,
                              ((dump == -1 || dump > len)?len:dump),
                              dump_indent) <= 0)
                              goto end;
                        nl=1;
                        }

                  if (!nl) 
                        {
                        if (BIO_write(bp,"\n",1) <= 0) goto end;
                        }
                  p+=len;
                  if ((tag == V_ASN1_EOC) && (xclass == 0))
                        {
                        ret=2; /* End of sequence */
                        goto end;
                        }
                  }
            length-=len;
            }
      ret=1;
end:
      if (o != NULL) ASN1_OBJECT_free(o);
      if (os != NULL) M_ASN1_OCTET_STRING_free(os);
      *pp=p;
      return(ret);
      }

const char *ASN1_tag2str(int tag)
{
      static const char *tag2str[] = {
       "EOC", "BOOLEAN", "INTEGER", "BIT STRING", "OCTET STRING", /* 0-4 */
       "NULL", "OBJECT", "OBJECT DESCRIPTOR", "EXTERNAL", "REAL", /* 5-9 */
       "ENUMERATED", "<ASN1 11>", "UTF8STRING", "<ASN1 13>",          /* 10-13 */
      "<ASN1 14>", "<ASN1 15>", "SEQUENCE", "SET",              /* 15-17 */
      "NUMERICSTRING", "PRINTABLESTRING", "T61STRING",          /* 18-20 */
      "VIDEOTEXSTRING", "IA5STRING", "UTCTIME","GENERALIZEDTIME", /* 21-24 */
      "GRAPHICSTRING", "VISIBLESTRING", "GENERALSTRING",        /* 25-27 */
      "UNIVERSALSTRING", "<ASN1 29>", "BMPSTRING"               /* 28-30 */
      };

      if((tag == V_ASN1_NEG_INTEGER) || (tag == V_ASN1_NEG_ENUMERATED))
                                          tag &= ~0x100;

      if(tag < 0 || tag > 30) return "(unknown)";
      return tag2str[tag];
}


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