gnupg/kbx/keybox-dump.c

/* keybox-dump.c - Debug helpers
 *	Copyright (C) 2001, 2003 Free Software Foundation, Inc.
 *
 * This file is part of GnuPG.
 *
 * GnuPG is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * GnuPG is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 */

#include <config.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>

#include "keybox-defs.h"
#include <gcrypt.h>

/* Argg, we can't include ../common/util.h */
char *bin2hexcolon (const void *buffer, size_t length, char *stringbuf);


static ulong
get32 (const byte *buffer)
{
  ulong a;
  a =  *buffer << 24;
  a |= buffer[1] << 16;
  a |= buffer[2] << 8;
  a |= buffer[3];
  return a;
}

static ulong
get16 (const byte *buffer)
{
  ulong a;
  a =  *buffer << 8;
  a |= buffer[1];
  return a;
}

void
print_string (FILE *fp, const byte *p, size_t n, int delim)
{
  for ( ; n; n--, p++ )
    {
      if (*p < 0x20 || (*p >= 0x7f && *p < 0xa0) || *p == delim)
        {
          putc('\\', fp);
          if( *p == '\n' )
            putc('n', fp);
          else if( *p == '\r' )
            putc('r', fp);
          else if( *p == '\f' )
            putc('f', fp);
          else if( *p == '\v' )
            putc('v', fp);
          else if( *p == '\b' )
            putc('b', fp);
          else if( !*p )
            putc('0', fp);
          else
            fprintf(fp, "x%02x", *p );
	}
      else
        putc(*p, fp);
    }
}


static int
dump_header_blob (const byte *buffer, size_t length, FILE *fp)
{
  unsigned long n;

  if (length < 32)
    {
      fprintf (fp, "[blob too short]\n");
      return -1;
    }
  fprintf (fp, "Version: %d\n", buffer[5]);
  if ( memcmp (buffer+8, "KBXf", 4))
    fprintf (fp, "[Error: invalid magic number]\n");

  n = get32 (buffer+16); 
  fprintf( fp, "created-at: %lu\n", n );
  n = get32 (buffer+20); 
  fprintf( fp, "last-maint: %lu\n", n );

  return 0;
}


/* Dump one block to FP */
int
_keybox_dump_blob (KEYBOXBLOB blob, FILE *fp)
{
  const byte *buffer;
  size_t length;
  int type;
  ulong n, nkeys, keyinfolen;
  ulong nuids, uidinfolen;
  ulong nsigs, siginfolen;
  ulong rawdata_off, rawdata_len;
  ulong nserial;
  const byte *p;

  buffer = _keybox_get_blob_image (blob, &length);
  
  if (length < 32)
    {
      fprintf (fp, "[blob too short]\n");
      return -1;
    }

  n = get32( buffer );
  if (n > length) 
    fprintf (fp, "[blob larger than length - output truncated]\n");
  else
    length = n;  /* ignore the rest */

  fprintf (fp, "Length: %lu\n", n );
  type = buffer[4];
  switch (type)
    {
    case BLOBTYPE_EMPTY:
      fprintf (fp, "Type:   Empty\n");
      return 0;

    case BLOBTYPE_HEADER:
      fprintf (fp, "Type:   Header\n");
      return dump_header_blob (buffer, length, fp);
    case BLOBTYPE_PGP:
      fprintf (fp, "Type:   OpenPGP\n");
      break;
    case BLOBTYPE_X509:
      fprintf (fp, "Type:   X.509\n");
      break;
    default:
      fprintf (fp, "Type:   %d\n", type);
      fprintf (fp, "[can't dump this blob type]\n");
      return 0;
    }
  fprintf (fp, "Version: %d\n", buffer[5]);

  if (length < 40)
    {
      fprintf (fp, "[blob too short]\n");
      return -1;
    }
  
  n = get16 (buffer + 6);
  fprintf( fp, "Blob-Flags: %04lX", n);
  if (n)
    {
      int any = 0;

      fputs (" (", fp);
      if ((n & 1))
        {
          fputs ("secret", fp);
          any++;
        }
      if ((n & 2))
        {
          if (any)
            putc (',', fp);
          fputs ("ephemeral", fp);
          any++;
        }
      putc (')', fp);
    }
  putc ('\n', fp);

  rawdata_off = get32 (buffer + 8);
  rawdata_len = get32 (buffer + 12);

  fprintf( fp, "Data-Offset: %lu\n", rawdata_off );
  fprintf( fp, "Data-Length: %lu\n", rawdata_len );
  if (rawdata_off > length || rawdata_len > length 
      || rawdata_off+rawdata_off > length)
    fprintf (fp, "[Error: raw data larger than blob]\n");

  nkeys = get16 (buffer + 16);
  fprintf (fp, "Key-Count: %lu\n", nkeys );
  if (!nkeys)
    fprintf (fp, "[Error: no keys]\n");
  if (nkeys > 1 && type == BLOBTYPE_X509)
    fprintf (fp, "[Error: only one key allowed for X509]\n");

  keyinfolen = get16 (buffer + 18 );
  fprintf (fp, "Key-Info-Length: %lu\n", keyinfolen);
  /* fixme: check bounds */
  p = buffer + 20;
  for (n=0; n < nkeys; n++, p += keyinfolen)
    {
      int i;
      ulong kidoff, kflags;
    
      fprintf (fp, "Key-Fpr[%lu]: ", n );
      for (i=0; i < 20; i++ )
        fprintf (fp, "%02X", p[i]);
      kidoff = get32 (p + 20);
      fprintf (fp, "\nKey-Kid-Off[%lu]: %lu\n", n, kidoff );
      fprintf (fp, "Key-Kid[%lu]: ", n );
      /* fixme: check bounds */
      for (i=0; i < 8; i++ )
        fprintf (fp, "%02X", buffer[kidoff+i] );
      kflags = get16 (p + 24 );
      fprintf( fp, "\nKey-Flags[%lu]: %04lX\n", n, kflags);
    }
  
  /* serial number */
  fputs ("Serial-No: ", fp);
  nserial = get16 (p);
  p += 2;
  if (!nserial)
    fputs ("none", fp);
  else
    {
      for (; nserial; nserial--, p++)
        fprintf (fp, "%02X", *p);
    }
  putc ('\n', fp);

  /* user IDs */
  nuids = get16 (p);
  fprintf (fp, "Uid-Count: %lu\n", nuids );
  uidinfolen = get16  (p + 2);
  fprintf (fp, "Uid-Info-Length: %lu\n", uidinfolen);
  /* fixme: check bounds */
  p += 4;
  for (n=0; n < nuids; n++, p += uidinfolen)
    {
      ulong uidoff, uidlen, uflags;
      
      uidoff = get32( p );
      uidlen = get32( p+4 );
      if (type == BLOBTYPE_X509 && !n)
        {
          fprintf (fp, "Issuer-Off: %lu\n", uidoff );
          fprintf (fp, "Issuer-Len: %lu\n", uidlen );
          fprintf (fp, "Issuer: \"");
        }
      else if (type == BLOBTYPE_X509 && n == 1)
        {
          fprintf (fp, "Subject-Off: %lu\n", uidoff );
          fprintf (fp, "Subject-Len: %lu\n", uidlen );
          fprintf (fp, "Subject: \"");
        }
      else
        {
          fprintf (fp, "Uid-Off[%lu]: %lu\n", n, uidoff );
          fprintf (fp, "Uid-Len[%lu]: %lu\n", n, uidlen );
          fprintf (fp, "Uid[%lu]: \"", n );
        }
      print_string (fp, buffer+uidoff, uidlen, '\"');
      fputs ("\"\n", fp);
      uflags = get16 (p + 8);
      if (type == BLOBTYPE_X509 && !n)
        {
          fprintf (fp, "Issuer-Flags: %04lX\n", uflags );
          fprintf (fp, "Issuer-Validity: %d\n", p[10] );
        }
      else if (type == BLOBTYPE_X509 && n == 1)
        {
          fprintf (fp, "Subject-Flags: %04lX\n", uflags );
          fprintf (fp, "Subject-Validity: %d\n", p[10] );
        }
      else
        {
          fprintf (fp, "Uid-Flags[%lu]: %04lX\n", n, uflags );
          fprintf (fp, "Uid-Validity[%lu]: %d\n", n, p[10] );
        }
    }
  
  nsigs = get16 (p);
  fprintf (fp, "Sig-Count: %lu\n", nsigs );
  siginfolen = get16 (p + 2);
  fprintf (fp, "Sig-Info-Length: %lu\n", siginfolen );
  /* fixme: check bounds  */
  p += 4;
  for (n=0; n < nsigs; n++, p += siginfolen)
    {
      ulong sflags;
    
      sflags = get32 (p);
      fprintf (fp, "Sig-Expire[%lu]: ", n );
      if (!sflags)
        fputs ("[not checked]", fp);
      else if (sflags == 1 )
        fputs ("[missing key]", fp);
      else if (sflags == 2 )
        fputs ("[bad signature]", fp);
      else if (sflags < 0x10000000)
        fprintf (fp, "[bad flag %0lx]", sflags);
      else if (sflags == 0xffffffff)
        fputs ("0", fp );
      else
        fputs ("a time"/*strtimestamp( sflags )*/, fp );
      putc ('\n', fp );
    }

  fprintf (fp, "Ownertrust: %d\n", p[0] );
  fprintf (fp, "All-Validity: %d\n", p[1] );
  p += 4;
  n = get32 (p); p += 4;
  fprintf (fp, "Recheck-After: %lu\n", n );
  n = get32 (p ); p += 4;
  fprintf( fp, "Latest-Timestamp: %lu\n", n );
  n = get32 (p ); p += 4;
  fprintf (fp, "Created-At: %lu\n", n );
  n = get32 (p ); p += 4;
  fprintf (fp, "Reserved-Space: %lu\n", n );

  /* check that the keyblock is at the correct offset and other bounds */
  /*fprintf (fp, "Blob-Checksum: [MD5-hash]\n");*/
  return 0;
}


/* Compute the SHA_1 checksum of teh rawdata in BLOB and aput it into
   DIGEST. */
static int
hash_blob_rawdata (KEYBOXBLOB blob, unsigned char *digest)
{
  const unsigned char *buffer;
  size_t n, length;
  int type;
  ulong rawdata_off, rawdata_len;

  buffer = _keybox_get_blob_image (blob, &length);
  
  if (length < 32)
    return -1;
  n = get32 (buffer);
  if (n < length) 
    length = n;  /* Blob larger than length in header - ignore the rest. */

  type = buffer[4];
  switch (type)
    {
    case BLOBTYPE_PGP:
    case BLOBTYPE_X509:
      break;

    case BLOBTYPE_EMPTY:
    case BLOBTYPE_HEADER:
    default:
      memset (digest, 0, 20);
      return 0;
    }

  if (length < 40)
    return -1;
  
  rawdata_off = get32 (buffer + 8);
  rawdata_len = get32 (buffer + 12);

  if (rawdata_off > length || rawdata_len > length 
      || rawdata_off+rawdata_off > length)
    return -1; /* Out of bounds.  */

  gcry_md_hash_buffer (GCRY_MD_SHA1, digest, buffer+rawdata_off, rawdata_len);
  return 0;
}


struct file_stats_s
{
  unsigned long too_short_blobs;
  unsigned long too_large_blobs;
  unsigned long total_blob_count;
  unsigned long empty_blob_count;
  unsigned long header_blob_count;
  unsigned long pgp_blob_count;
  unsigned long x509_blob_count;
  unsigned long unknown_blob_count;
  unsigned long non_flagged;
  unsigned long secret_flagged;
  unsigned long ephemeral_flagged;
};

static int
update_stats (KEYBOXBLOB blob, struct file_stats_s *s)
{
  const unsigned char *buffer;
  size_t length;
  int type;
  unsigned long n;

  buffer = _keybox_get_blob_image (blob, &length);
  if (length < 32)
    {
      s->too_short_blobs++;
      return -1;
    }

  n = get32( buffer );
  if (n > length) 
    s->too_large_blobs++;
  else
    length = n;  /* ignore the rest */

  s->total_blob_count++;
  type = buffer[4];
  switch (type)
    {
    case BLOBTYPE_EMPTY:
      s->empty_blob_count++;
      return 0;
    case BLOBTYPE_HEADER:
      s->header_blob_count++;
      return 0;
    case BLOBTYPE_PGP:
      s->pgp_blob_count++;
      break;
    case BLOBTYPE_X509:
      s->x509_blob_count++;
      break;
    default:
      s->unknown_blob_count++;
      return 0;
    }

  if (length < 40)
    {
      s->too_short_blobs++;
      return -1;
    }
  
  n = get16 (buffer + 6);
  if (n)
    {
      if ((n & 1))
        s->secret_flagged++;
      if ((n & 2))
        s->ephemeral_flagged++;
    }
  else
    s->non_flagged++;

  return 0;
}



static FILE *
open_file (const char **filename, FILE *outfp)
{
  FILE *fp;

  if (!*filename)
    {
      *filename = "-";
      fp = stdin;
    }
  else
    fp = fopen (*filename, "rb");
  if (!fp)
    {
      int save_errno = errno;
      fprintf (outfp, "can't open `%s': %s\n", *filename, strerror(errno));
      errno = save_errno;
    }
  return fp;
}



int
_keybox_dump_file (const char *filename, int stats_only, FILE *outfp)
{
  FILE *fp;
  KEYBOXBLOB blob;
  int rc;
  unsigned long count = 0;
  struct file_stats_s stats;

  memset (&stats, 0, sizeof stats);

  if (!(fp = open_file (&filename, outfp)))
    return gpg_error_from_syserror ();

  while ( !(rc = _keybox_read_blob (&blob, fp)) )
    {
      if (stats_only)
        {
          update_stats (blob, &stats);
        }
      else
        {
          fprintf (outfp, "BEGIN-RECORD: %lu\n", count );
          _keybox_dump_blob (blob, outfp);
          fprintf (outfp, "END-RECORD\n");
        }
      _keybox_release_blob (blob);
      count++;
    }
  if (rc == -1)
    rc = 0;
  if (rc)
    fprintf (outfp, "error reading `%s': %s\n", filename, gpg_strerror (rc));
  
  if (fp != stdin)
    fclose (fp);

  if (stats_only)
    {
      fprintf (outfp, 
               "Total number of blobs: %8lu\n"
               "               header: %8lu\n"
               "                empty: %8lu\n"
               "              openpgp: %8lu\n"
               "                 x509: %8lu\n"
               "          non flagged: %8lu\n"
               "       secret flagged: %8lu\n"
               "    ephemeral flagged: %8lu\n",
               stats.total_blob_count,
               stats.header_blob_count,
               stats.empty_blob_count,
               stats.pgp_blob_count,
               stats.x509_blob_count,
               stats.non_flagged,
               stats.secret_flagged,
               stats.ephemeral_flagged);
        if (stats.unknown_blob_count)
          fprintf (outfp, "   unknown blob types: %8lu\n",
                   stats.unknown_blob_count);
        if (stats.too_short_blobs)
          fprintf (outfp, "      too short blobs: %8lu\n",
                   stats.too_short_blobs);
        if (stats.too_large_blobs)
          fprintf (outfp, "      too large blobs: %8lu\n",
                   stats.too_large_blobs);
    }

  return rc;
}



struct dupitem_s 
{
  unsigned long recno; 
  unsigned char digest[20];
};


static int
cmp_dupitems (const void *arg_a, const void *arg_b)
{
  struct dupitem_s *a = (struct dupitem_s *)arg_a;
  struct dupitem_s *b = (struct dupitem_s *)arg_b;
  
  return memcmp (a->digest, b->digest, 20);
}


int
_keybox_dump_find_dups (const char *filename, int print_them, FILE *outfp)
{
  FILE *fp;
  KEYBOXBLOB blob;
  int rc;
  unsigned long recno = 0;
  unsigned char zerodigest[20];
  struct dupitem_s *dupitems;
  size_t dupitems_size, dupitems_count, lastn, n;
  char fprbuf[3*20+1];
  
  memset (zerodigest, 0, sizeof zerodigest);

  if (!(fp = open_file (&filename, outfp)))
    return gpg_error_from_syserror ();

  dupitems_size = 1000;
  dupitems = malloc (dupitems_size * sizeof *dupitems);
  if (!dupitems)
    {
      gpg_error_t tmperr = gpg_error_from_syserror ();
      fprintf (outfp, "error allocating array for `%s': %s\n",
               filename, strerror(errno));
      return tmperr;
    }
  dupitems_count = 0;

  while ( !(rc = _keybox_read_blob (&blob, fp)) )
    {
      unsigned char digest[20];
      
      if (hash_blob_rawdata (blob, digest))
        fprintf (outfp, "error in blob %ld of `%s'\n", recno, filename);
      else if (memcmp (digest, zerodigest, 20))
        {
          if (dupitems_count >= dupitems_size)
            {
              struct dupitem_s *tmp;

              dupitems_size += 1000;
              tmp = realloc (dupitems, dupitems_size * sizeof *dupitems);
              if (!tmp)
                {
                  gpg_error_t tmperr = gpg_error_from_syserror ();
                  fprintf (outfp, "error reallocating array for `%s': %s\n",
                           filename, strerror(errno));
                  free (dupitems);
                  return tmperr;
                }
              dupitems = tmp;
            }
          dupitems[dupitems_count].recno = recno;
          memcpy (dupitems[dupitems_count].digest, digest, 20);
          dupitems_count++;
        }
      _keybox_release_blob (blob);
      recno++;
    }
  if (rc == -1)
    rc = 0;
  if (rc)
    fprintf (outfp, "error reading `%s': %s\n", filename, gpg_strerror (rc));
  if (fp != stdin)
    fclose (fp);

  qsort (dupitems, dupitems_count, sizeof *dupitems, cmp_dupitems);

  for (lastn=0, n=1; n < dupitems_count; lastn=n, n++)
    {
      if (!memcmp (dupitems[lastn].digest, dupitems[n].digest, 20))
        {
          bin2hexcolon (dupitems[lastn].digest, 20, fprbuf);
          fprintf (outfp, "fpr=%s recno=%lu", fprbuf, dupitems[lastn].recno);
          do
            fprintf (outfp, " %lu", dupitems[n].recno);
          while (++n < dupitems_count
                 && !memcmp (dupitems[lastn].digest, dupitems[n].digest, 20));
          putc ('\n', outfp);
          n--;
        }
    }

  free (dupitems);

  return rc;
}


/* Print records with record numbers FROM to TO to OUTFP.  */
int
_keybox_dump_cut_records (const char *filename, unsigned long from,
                          unsigned long to, FILE *outfp)
{
  FILE *fp;
  KEYBOXBLOB blob;
  int rc;
  unsigned long recno = 0;
  
  if (!(fp = open_file (&filename, stderr)))
    return gpg_error_from_syserror ();

  while ( !(rc = _keybox_read_blob (&blob, fp)) )
    {
      if (recno > to)
        break; /* Ready.  */
      if (recno >= from)
        {
          if ((rc = _keybox_write_blob (blob, outfp)))
            {
              fprintf (stderr, "error writing output: %s\n",
                       gpg_strerror (rc));
              goto leave;
            }
        }
      _keybox_release_blob (blob);
      recno++;
    }
  if (rc == -1)
    rc = 0;
  if (rc)
    fprintf (stderr, "error reading `%s': %s\n", filename, gpg_strerror (rc));
 leave:
  if (fp != stdin)
    fclose (fp);
  return rc;
}