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mangle.cgi.c
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/*
HTML manglizer
--------------
Copyright (C) 2004 by Michal Zalewski <[email protected]>
HTML manglizer library. Logs random seeds to error-log; find the last entry before
crash, then pass it to remangle.cgi to reproduce the problem.
*/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "tags.h"
#define R(x) (rand() % (x))
#define MAXTCOUNT 100
#define MAXPCOUNT 20
#define MAXSTR2 80
void make_up_value(void) {
char c=R(2);
if (c) putchar('"');
switch (R(31)) {
case 0: printf("javascript:"); make_up_value(); break;
// case 1: printf("jar:"); make_up_value(); break;
case 2: printf("mk:"); make_up_value(); break;
case 3: printf("file:"); make_up_value(); break;
case 4: printf("http:"); make_up_value(); break;
case 5: printf("about:"); make_up_value(); break;
case 6: printf("_blank"); break;
case 7: printf("_self"); break;
case 8: printf("top"); break;
case 9: printf("left"); break;
case 10: putchar('&'); make_up_value(); putchar(';'); break;
case 11: make_up_value(); make_up_value(); break;
case 12 ... 20: {
int c = R(10) ? R(10) : (1 + R(MAXSTR2) * R(MAXSTR2));
char* x = malloc(c);
memset(x,R(256),c);
fwrite(x,c,1,stdout);
free(x);
break;
}
case 21: printf("%s","%n%n%n%n%n%n"); break;
case 22: putchar('#'); break;
case 23: putchar('*'); break;
default: if (R(2)) putchar('-'); printf("%d",rand()); break;
}
if (c) putchar('"');
}
void random_tag(void) {
int tn, tc;
do tn = R(MAXTAGS); while (!tags[tn][0]);
tc = R(MAXPCOUNT) + 1;
putchar('<');
switch (R(10)) {
case 0: putchar(R(256)); break;
case 1: putchar('/');
}
printf("%s", tags[tn][0]);
while (tc--) {
int pn;
switch (R(32)) {
case 0: putchar(R(256));
case 1: break;
default: putchar(' ');
}
do pn = R(MAXPARS-1) + 1; while (!tags[tn][pn]);
printf("%s", tags[tn][pn]);
switch (R(32)) {
case 0: putchar(R(256));
case 1: break;
default: putchar('=');
}
make_up_value();
}
putchar('>');
}
int main(int argc,char** argv) {
int tc,seed;
printf("Content-Type: text/html;charset=utf-8\nRefresh: 0;URL=mangle.cgi\n\n");
printf("<HTML><HEAD><META HTTP-EQUIV=\"Refresh\" content=\"0;URL=mangle.cgi\">\n");
printf("<script language=\"javascript\">setTimeout('window.location=\"mangle.cgi\"', 1000);</script>\n");
seed = (time(0) ^ (getpid() << 16));
fprintf(stderr,"[%u] Mangle attempt 0x%08x (%s) -- %s\n", (int)time(0), seed, getenv("HTTP_USER_AGENT"), getenv("REMOTE_ADDR"));
srand(seed);
tc = R(MAXTCOUNT) + 1;
while (tc--) random_tag();
fflush(0);
return 0;
}