175 lines
4.9 KiB
C
175 lines
4.9 KiB
C
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/* This code is originally from a Bugtraq post by
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Jared Mauch <jared@puck.nether.net> . I patched it with an improved
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translation table by Janos Zsako <zsako@BANKNET.NET>
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-Fyodor (fyodor@insecure.org) */
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#include <stdio.h>
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#include <ctype.h>
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char xlat[] = {
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0x64, 0x73, 0x66, 0x64, 0x3b, 0x6b, 0x66, 0x6f,
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0x41, 0x2c, 0x2e, 0x69, 0x79, 0x65, 0x77, 0x72,
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0x6b, 0x6c, 0x64, 0x4a, 0x4b, 0x44, 0x48, 0x53 , 0x55, 0x42
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};
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char pw_str1[] = " password 7 ";
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char pw_str2[] = "enable password 7 ";
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char pw_str3[] = "ip ftp password 7 ";
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char pw_str4[] = " ip ospf message-digest-key 1 md5 7 ";
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char *pname;
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cdecrypt(enc_pw, dec_pw)
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char *enc_pw;
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char *dec_pw;
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{
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unsigned int seed, i, val = 0;
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if(strlen(enc_pw) & 1)
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return(-1);
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seed = (enc_pw[0] - '0') * 10 + enc_pw[1] - '0';
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if (seed > 15 || !isdigit(enc_pw[0]) || !isdigit(enc_pw[1]))
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return(-1);
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for (i = 2 ; i <= strlen(enc_pw); i++) {
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if(i !=2 && !(i & 1)) {
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dec_pw[i / 2 - 2] = val ^ xlat[seed++];
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val = 0;
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}
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val *= 16;
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if(isdigit(enc_pw[i] = toupper(enc_pw[i]))) {
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val += enc_pw[i] - '0';
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continue;
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}
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if(enc_pw[i] >= 'A' && enc_pw[i] <= 'F') {
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val += enc_pw[i] - 'A' + 10;
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continue;
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}
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if(strlen(enc_pw) != i)
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return(-1);
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}
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dec_pw[++i / 2] = 0;
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return(0);
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}
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usage()
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{
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fprintf(stdout, "Usage: %s -p <encrypted password>\n", pname);
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fprintf(stdout, " %s <router config file> <output file>\n", pname);
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return(0);
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}
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main(argc,argv)
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int argc;
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char **argv;
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{
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FILE *in = stdin, *out = stdout;
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char line[257];
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char passwd[65];
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unsigned int i, pw_pos;
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pname = argv[0];
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if(argc > 1)
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{
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if(argc > 3) {
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usage();
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exit(1);
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}
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if(argv[1][0] == '-')
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{
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switch(argv[1][1]) {
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case 'h':
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usage();
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break;
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case 'p':
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bzero(passwd, sizeof(passwd));
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if(cdecrypt(argv[2], passwd)) {
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fprintf(stderr, "Error.\n");
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exit(1);
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}
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fprintf(stdout, "password: %s\n", passwd);
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break;
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default:
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fprintf(stderr, "%s: unknow option.", pname);
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}
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return(0);
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}
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if((in = fopen(argv[1], "rt")) == NULL)
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exit(1);
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if(argc > 2)
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if((out = fopen(argv[2], "wt")) == NULL)
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exit(1);
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}
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while(1) {
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for(i = 0; i < 256; i++) {
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if((line[i] = fgetc(in)) == EOF) {
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if(i)
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break;
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fclose(in);
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fclose(out);
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return(0);
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}
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if(line[i] == '\r')
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i--;
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if(line[i] == '\n')
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break;
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}
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pw_pos = 0;
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line[i] = 0;
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if(!strncmp(line, pw_str1, strlen(pw_str1)))
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pw_pos = strlen(pw_str1);
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if(!strncmp(line, pw_str2, strlen(pw_str2)))
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pw_pos = strlen(pw_str2);
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if(!strncmp(line, pw_str3, strlen(pw_str3)))
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pw_pos = strlen(pw_str3);
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if(!strncmp(line, pw_str4, strlen(pw_str4)))
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pw_pos = strlen(pw_str4);
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if(!pw_pos) {
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fprintf(stdout, "%s\n", line);
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continue;
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}
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bzero(passwd, sizeof(passwd));
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if(cdecrypt(&line[pw_pos], passwd)) {
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fprintf(stderr, "Error.\n");
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exit(1);
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}
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else {
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if(pw_pos == strlen(pw_str1))
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fprintf(out, "%s", pw_str1);
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else if (pw_pos == strlen(pw_str2))
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fprintf(out, "%s", pw_str2);
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else if (pw_pos == strlen(pw_str3))
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fprintf(out, "%s", pw_str3);
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else if (pw_pos == strlen(pw_str4))
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fprintf(out, "%s", pw_str4);
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fprintf(out, "%s\n", passwd);
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}
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}
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}
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