/*************************************************************************** * fingerdiff.c -- A relatively simple utility for determining the * * differences between a "reference" fingerprint (which can have * * expressions as attributes) and an observed fingerprint (no * * expressions). * * * ***********************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 * * o Reads or includes Nmap copyrighted data files, such as * * 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 * * installer, such as those produced by InstallShield. * * 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 * * works of Nmap. This list is not exclusive, but is just meant to * * clarify our interpretation of derived works with some common examples. * * These restrictions only apply when you actually redistribute Nmap. For * * example, nothing stops you from writing and selling a proprietary * * front-end to Nmap. Just distribute it by itself, and point people to * * http://www.insecure.org/nmap/ to download Nmap. * * * * We don't consider these to be added restrictions on top of the GPL, but * * just a clarification of how we interpret "derived works" as it applies * * to our GPL-licensed Nmap product. This is similar to the way Linus * * Torvalds has announced his interpretation of how "derived works" * * applies to Linux kernel modules. Our interpretation refers only to * * Nmap - we don't speak for any other GPL products. * * * * If you have any questions about the GPL licensing restrictions on using * * Nmap in non-GPL works, we would be happy to help. As mentioned above, * * we also offer alternative license to integrate Nmap into proprietary * * applications and appliances. These contracts have been sold to many * * security vendors, and generally include a perpetual license as well as * * providing for priority support and updates as well as helping to fund * * 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 * * combinations including the two. You must obey the GNU GPL in all * * respects for all of the code used other than OpenSSL. If you modify * * this file, you may extend this exception to your version of the file, * * 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 * * projects (such as KDE and NASM). We also occasionally relicense the * * code to third parties as discussed above. If you wish to specify * * special license conditions of your contributions, just say so when you * * 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" void usage(char *err_fmt, ...) { va_list ap; if (err_fmt) { va_start(ap, err_fmt); fflush(stdout); vfprintf(stderr, err_fmt, ap); fprintf(stderr, "\n"); va_end(ap); } printf("\nUsage: Use fingerdiff w/o any arguments to read the reference\n" " FP front stdin, or give filename:lineno to read it from\n" " nmap-os-fingerprints.\n\n"); exit(1); } /* Returns -1 (or exits) for failure */ int readFP(FILE *filep, char *newFP, int newFPsz ) { char line[512], lasttestname[64]; int linelen; int lastlinelen = 0; int printlen = 0; int adjusted = 0; /* Flags if we have adjusted the entered fingerprint */ char *p; if (newFPsz < 50) return -1; newFP[0] = lasttestname[0] = '\0'; while((fgets(line, sizeof(line), filep))) { 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; newFP[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 >= newFPsz - 5) fatal("Overflow!"); strcpy(newFP + 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", newFP); } /* Now we validate that all elements are present */ p = newFP; if (!strstr(p, "TSeq(") || !strstr(p, "T1(") || !strstr(p, "T2(") || !strstr(p, "T3(") || !strstr(p, "T4(") || !strstr(p, "T5(") || !strstr(p, "T6(") || !strstr(p, "T7(") || !strstr(p, "PU(")) { /* This ought to get my attention :) */ printf("\n" "********************************************************\n" "***WARNING: Fingerprint is missing at least 1 element***\n" "********************************************************\n" ); } if (printlen < 1) return -1; return 0; } int main(int argc, char *argv[]) { FingerPrint *referenceFP; FingerPrint *observedFP; double accuracy; char sourcefile[MAXPATHLEN]; int sourceline=-1; char referenceFPString[2048]; char observedFPString[2048]; char line[512]; char *p, *endptr; int i; int done=0; FILE *fp; if (argc < 1 || argc > 2) usage(NULL); referenceFPString[0] = observedFPString[0] = '\0'; if (argc == 2) { Strncpy(sourcefile, argv[1], sizeof(sourcefile)); p = strchr(sourcefile, ':'); if (!p) usage("Filename must be followed by a colon and then line number"); *p++ = '\0'; if (!*p) usage(NULL); sourceline = strtol(p, &endptr, 10); if (*endptr) { error("could not parse line number (trailing garbage?)"); } fp = fopen(sourcefile, "r"); done = 0; i = 1; while(i < sourceline) { if (fgets(line, sizeof(line), fp) == NULL) usage("Failed to read to line %d of %s", sourceline, sourcefile); i++; } if (readFP(fp, referenceFPString, sizeof(referenceFPString)) == -1) usage("Failed to read in supposed fingerprint in %s line %d\n", sourcefile, sourceline); fclose(fp); printf("STEP ONE: Reading REFERENCE FINGERPRINT from %s line %d:\n%s\n" ,sourcefile, sourceline, referenceFPString); } else { printf("STEP ONE: Enter the **REFERENCE FINGERPRINT**, followed by a blank or single-dot line:\n"); if (readFP(stdin, referenceFPString, sizeof(referenceFPString)) == -1) usage("Failed to read in supposed fingerprint from stdin\n"); } referenceFP = parse_single_fingerprint(referenceFPString); if (!referenceFP) fatal("Sorry -- failed to parse the so-called reference fingerprint you entered"); printf("STEP TWO: Enter the **OBSERVED FINGERPRINT**, followed by a blank or single-dot line:\n"); if (readFP(stdin, observedFPString, sizeof(observedFPString)) == -1) usage("Failed to read in supposed observed fingerprint from stdin\n"); observedFP = parse_single_fingerprint(observedFPString); if (!observedFP) fatal("Sorry -- failed to parse the so-called reference fingerprint you entered"); /* OK, now I've got the fingerprints -- I just need to compare them ... */ accuracy = compare_fingerprints(referenceFP, observedFP, 1); if (accuracy == 1) printf("PERFECT MATCH!\n"); else printf("Accuracy of the two prints is %d%% -- see differences above.\n", (int) (accuracy * 100)); return 0; }