fingermatch.cc

/***************************************************************************
 * fingermatch.cc -- A relatively simple utility for determining whether a *
 * given Nmap fingerprint matches (or comes close to matching) any of the  *
 * fingerprints in a collection such as the nmap-os-fingerprints file that *
 * ships with Nmap.                                                        *
 *                                                                         *
 ***********************IMPORTANT NMAP LICENSE TERMS************************
 *                                                                         *
 * The Nmap Security Scanner is (C) 1996-2004 Insecure.Com LLC. Nmap       *
 * is also a registered trademark of Insecure.Com LLC.  This program is    *
 * free software; you may redistribute and/or modify it under the          *
 * terms of the GNU General Public License as published by the Free        *
 * Software Foundation; Version 2.  This guarantees your right to use,     *
 * modify, and redistribute this software under certain conditions.  If    *
 * you wish to embed Nmap technology into proprietary software, we may be  *
 * willing to sell alternative licenses (contact sales@insecure.com).      *
 * Many security scanner vendors already license Nmap technology such as  *
 * our remote OS fingerprinting database and code, service/version         *
 * detection system, and port scanning code.                               *
 *                                                                         *
 * Note that the GPL places important restrictions on "derived works", yet *
 * it does not provide a detailed definition of that term.  To avoid       *
 * misunderstandings, we consider an application to constitute a           *
 * "derivative work" for the purpose of this license if it does any of the *
 * following:                                                              *
 * o Integrates source code from Nmap                                      *
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 *   nmap-os-fingerprints or nmap-service-probes.                          *
 * o Executes Nmap and parses the results (as opposed to typical shell or  *
 *   execution-menu apps, which simply display raw Nmap output and so are  *
 *   not derivative works.)                                                * 
 * o Integrates/includes/aggregates Nmap into a proprietary executable     *
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 * o Links to a library or executes a program that does any of the above   *
 *                                                                         *
 * The term "Nmap" should be taken to also include any portions or derived *
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 * front-end to Nmap.  Just distribute it by itself, and point people to   *
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 *                                                                         *
 * We don't consider these to be added restrictions on top of the GPL, but *
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 * Torvalds has announced his interpretation of how "derived works"        *
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 * Nmap - we don't speak for any other GPL products.                       *
 *                                                                         *
 * If you have any questions about the GPL licensing restrictions on using *
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 * we also offer alternative license to integrate Nmap into proprietary    *
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 * the continued development of Nmap technology.  Please email             *
 * sales@insecure.com for further information.                             *
 *                                                                         *
 * As a special exception to the GPL terms, Insecure.Com LLC grants        *
 * permission to link the code of this program with any version of the     *
 * OpenSSL library which is distributed under a license identical to that  *
 * listed in the included Copying.OpenSSL file, and distribute linked      *
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 * respects for all of the code used other than OpenSSL.  If you modify    *
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 * but you are not obligated to do so.                                     *
 *                                                                         *
 * If you received these files with a written license agreement or         *
 * contract stating terms other than the terms above, then that            *
 * alternative license agreement takes precedence over these comments.     *
 *                                                                         *
 * Source is provided to this software because we believe users have a     *
 * right to know exactly what a program is going to do before they run it. *
 * This also allows you to audit the software for security holes (none     *
 * have been found so far).                                                *
 *                                                                         *
 * Source code also allows you to port Nmap to new platforms, fix bugs,    *
 * and add new features.  You are highly encouraged to send your changes   *
 * to fyodor@insecure.org for possible incorporation into the main         *
 * distribution.  By sending these changes to Fyodor or one the            *
 * Insecure.Org development mailing lists, it is assumed that you are      *
 * offering Fyodor and Insecure.Com LLC the unlimited, non-exclusive right *
 * to reuse, modify, and relicense the code.  Nmap will always be          *
 * available Open Source, but this is important because the inability to   *
 * relicense code has caused devastating problems for other Free Software  *
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 * code to third parties as discussed above.  If you wish to specify       *
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 * send them.                                                              *
 *                                                                         *
 * This program 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 at                              *
 * http://www.gnu.org/copyleft/gpl.html , or in the COPYING file included  *
 * with Nmap.                                                              *
 *                                                                         *
 ***************************************************************************/

/* $Id$ */


#include "nbase.h"
#include "nmap.h"
#include "osscan.h"

#define FINGERMATCH_GUESS_THRESHOLD 0.75 /* How low we will still show guesses for */

void usage() {
  printf("Usage: fingermatch <fingerprintfilename>\n"
         "(You will be prompted for the fingerprint data)\n"
	 "\n");
  exit(1);
}

int main(int argc, char *argv[]) {
  char *fingerfile = NULL;
  FingerPrint **reference_FPs = NULL;
  FingerPrint *testFP;
  struct FingerPrintResults FPR;
  char fprint[2048];
  unsigned int printlen = 0;
  char line[512];
  unsigned int linelen;
  char lasttestname[32];
  unsigned int lastlinelen = 0;
  char *p;
  int i;
  char gen[128]; /* temporary buffer for os generation part of classification */

  int adjusted = 0; /* Flags if we have adjusted the entered fingerprint */

  if (argc != 2)
    usage();

  /* First we read in the fingerprint file provided on the command line */
  fingerfile = argv[1];
  reference_FPs = parse_fingerprint_file(fingerfile);
  if (reference_FPs == NULL) 
    fatal("Could not open or parse Fingerprint file given on the command line: %s", fingerfile);

  /* Now we read in the user-provided fingerprint */
  printf("Enter the fingerprint you would like to match, followed by a blank single-dot line:\n");

  lasttestname[0] = '\0';
  while(fgets(line, sizeof(line), stdin)) {
    if (*line == '\n' || *line == '.')
      break;
    linelen = strlen(line);
    /* Check if it is a duplicate testname */
    if (*line == '#')
      continue;
    p = strchr(line, '(');
    if (p) {
      *p = '\0';
      if (strcmp(line, lasttestname) == 0) {
	adjusted = 1;
	if (lastlinelen >= linelen)
	  continue;
	/* The new one is longer (and thus probably better) -- clobber the last
	   line */
	printlen -= lastlinelen;
	fprint[printlen] = '\0';
      }
      Strncpy(lasttestname, line, sizeof(lasttestname));
      lastlinelen = linelen;
      *p = '(';
    } else {
      /* The only legitimate non-comment line that doesn't have a ( is the 
	 initial Fingerprint and the following Class line(s) */
      if (strncmp(line, "Class ", 6) == 0) {
	char *q = line + 6;
	while(*q && isspace(*q)) q++;
	if (!*q) continue; // Empty class line
      } else if (strncmp(line, "Fingerprint ", 12) != 0) {
	printf("Warning: Bogus line skipped\n");
	continue;
      }
    }
    if (printlen + linelen >= sizeof(fprint) - 5)
      fatal("Overflow!");
    strcpy(fprint + printlen, line);
    printlen += linelen;
  }

  if (adjusted) {
    printf("\n**WARNING**: Adjusted fingerprint due to duplicated tests (we only look at the first).  Results are based on this adjusted fingerprint:\n%s\n", fprint);
  }

  /* Now we validate that all elements are present */
  if (!strstr(fprint, "TSeq(") || !strstr(fprint, "T1(") || 
      !strstr(fprint, "T2(") || !strstr(fprint, "T3(") || 
      !strstr(fprint, "T4(") || !strstr(fprint, "T5(") || 
      !strstr(fprint, "T6(") || !strstr(fprint, "T7(") ||
      !strstr(fprint, "PU(")) {
    /* This ought to get my attention :) */
    printf("\n"
           "********************************************************\n"
           "***WARNING: Fingerprint is missing at least 1 element***\n"
           "********************************************************\n");
  }

  testFP = parse_single_fingerprint(fprint);
  if (!testFP) fatal("Sorry -- failed to parse the so-called fingerprint you entered");

  /* Now we find the matches! */
  match_fingerprint(testFP, &FPR, reference_FPs, FINGERMATCH_GUESS_THRESHOLD);

  switch(FPR.overall_results) {
  case OSSCAN_NOMATCHES:
    printf("**NO MATCHES** found for the entered fingerprint in %s\n", fingerfile);
    break;
  case OSSCAN_TOOMANYMATCHES:
    printf("Found **TOO MANY EXACT MATCHES** to print for entered fingerprint in %s\n", fingerfile);
    break;
  case OSSCAN_SUCCESS:
    if (FPR.num_perfect_matches > 0) {
      printf("Found **%d PERFECT MATCHES** for entered fingerprint in %s:\n", FPR.num_perfect_matches, fingerfile);
      printf("Accu Line# OS (classification)\n");      
      for(i=0; i < FPR.num_matches && FPR.accuracy[i] == 1; i++) {
	if (FPR.prints[i]->OS_class[0].OS_Generation)
	  snprintf(gen, sizeof(gen), " %s ", FPR.prints[i]->OS_class[0].OS_Generation);
	else gen[0] = '\0';	
	printf("100%% %5d %s (%s | %s |%s| %s)\n", FPR.prints[i]->line, FPR.prints[i]->OS_name, FPR.prints[i]->OS_class[0].OS_Vendor, FPR.prints[i]->OS_class[0].OS_Family, gen, FPR.prints[i]->OS_class[0].Device_Type );
      }
    } else {
      printf("No perfect matches found, **GUESSES AVAILABLE** for entered fingerprint in %s:\n", fingerfile);
      printf("Accu Line# OS (classification)\n");
      for(i=0; i < 10 && i < FPR.num_matches; i++) {
	if (FPR.prints[i]->OS_class[0].OS_Generation)
	  snprintf(gen, sizeof(gen), " %s ", FPR.prints[i]->OS_class[0].OS_Generation);
	else gen[0] = '\0';	
	printf("%3d%% %5d %s (%s | %s |%s| %s)\n", (int) (FPR.accuracy[i] * 100), FPR.prints[i]->line, FPR.prints[i]->OS_name, FPR.prints[i]->OS_class[0].OS_Vendor, FPR.prints[i]->OS_class[0].OS_Family, gen, FPR.prints[i]->OS_class[0].Device_Type );
      }
    }
    printf("\n");
    break;
  default:
    fatal("Bogus error.");
    break;
  }

  return 0;
}