1 /*
2
3 HTML manglizer
4 --------------
5 Copyright (C) 2004 by Michal Zalewski <lcamtuf@coredump.cx>
6
7 HTML manglizer library. Logs random seeds to error-log; find the last entry before
8 crash, then pass it to remangle.cgi to reproduce the problem.
9
10 */
11
12
13 #include <stdio.h>
14 #include <unistd.h>
15 #include <stdlib.h>
16 #include <string.h>
17 #include <time.h>
18
19 #include "tags.h"
20
21 #define R(x) (rand() % (x))
22
23 #define MAXTCOUNT 100
24 #define MAXPCOUNT 20
25 #define MAXSTR2 80
26
make_up_value(void)27 void make_up_value(void) {
28 char c=R(2);
29
30 if (c) putchar('"');
31
32 switch (R(31)) {
33
34 case 0: printf("javascript:"); make_up_value(); break;
35 // case 1: printf("jar:"); make_up_value(); break;
36 case 2: printf("mk:"); make_up_value(); break;
37 case 3: printf("file:"); make_up_value(); break;
38 case 4: printf("http:"); make_up_value(); break;
39 case 5: printf("about:"); make_up_value(); break;
40 case 6: printf("_blank"); break;
41 case 7: printf("_self"); break;
42 case 8: printf("top"); break;
43 case 9: printf("left"); break;
44 case 10: putchar('&'); make_up_value(); putchar(';'); break;
45 case 11: make_up_value(); make_up_value(); break;
46
47 case 12 ... 20: {
48 int c = R(10) ? R(10) : (1 + R(MAXSTR2) * R(MAXSTR2));
49 char* x = malloc(c);
50 memset(x,R(256),c);
51 fwrite(x,c,1,stdout);
52 free(x);
53 break;
54 }
55
56 case 21: printf("%s","%n%n%n%n%n%n"); break;
57 case 22: putchar('#'); break;
58 case 23: putchar('*'); break;
59 default: if (R(2)) putchar('-'); printf("%d",rand()); break;
60
61 }
62
63 if (c) putchar('"');
64
65 }
66
67
random_tag(void)68 void random_tag(void) {
69 int tn, tc;
70
71 do tn = R(MAXTAGS); while (!tags[tn][0]);
72 tc = R(MAXPCOUNT) + 1;
73
74 putchar('<');
75
76 switch (R(10)) {
77 case 0: putchar(R(256)); break;
78 case 1: putchar('/');
79 }
80
81 printf("%s", tags[tn][0]);
82
83 while (tc--) {
84 int pn;
85 switch (R(32)) {
86 case 0: putchar(R(256));
87 case 1: break;
88 default: putchar(' ');
89 }
90 do pn = R(MAXPARS-1) + 1; while (!tags[tn][pn]);
91 printf("%s", tags[tn][pn]);
92 switch (R(32)) {
93 case 0: putchar(R(256));
94 case 1: break;
95 default: putchar('=');
96 }
97
98 make_up_value();
99
100 }
101
102 putchar('>');
103
104 }
105
106
main(int argc,char ** argv)107 int main(int argc,char** argv) {
108 int tc,seed;
109
110 printf("Content-Type: text/html;charset=utf-8\nRefresh: 0;URL=mangle.cgi\n\n");
111 printf("<HTML><HEAD><META HTTP-EQUIV=\"Refresh\" content=\"0;URL=mangle.cgi\">\n");
112 printf("<script language=\"javascript\">setTimeout('window.location=\"mangle.cgi\"', 1000);</script>\n");
113
114 seed = (time(0) ^ (getpid() << 16));
115 fprintf(stderr,"[%u] Mangle attempt 0x%08x (%s) -- %s\n", (int)time(0), seed, getenv("HTTP_USER_AGENT"), getenv("REMOTE_ADDR"));
116 srand(seed);
117
118 tc = R(MAXTCOUNT) + 1;
119 while (tc--) random_tag();
120 fflush(0);
121 return 0;
122 }
123