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ip_overflow_chk.c
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ip_overflow_chk.c
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/*
* ip_overflow_chk.c
* Random code that's been a part of my journey to evade IDS/IPS/WAF and other `smart' gear.
*
* Compare 32-bit unsigned long int, hex, and octal presented overflow
* IPv4 addresses against a given quad-dotted octet IP address.
* Base 10 (256^4 * n)
*
* This will also compare and (in)validate non-overflow, but strangely
* formatted IPv4 addresses against a given quad-dotted octet IP.
*
* On vulnerable systems, you can bypass this tool and test by simply
* using `ping' to see the (im)proper translation.
* e.g. OS X Sierra 10.12.4, etc.
*
* Usage examples:
* $ dig +short hax.gs
* 74.52.118.29
* $ ./ip_overflow_chk 74.52.118.29 22719788573
* $ ./ip_overflow_chk 74.52.118.29 430741681693
* $ ./ip_overflow_chk 74.52.118.29 011215073035
* $ ./ip_overflow_chk 74.52.118.29 0171215073035
* $ ./ip_overflow_chk 74.52.118.29 0221452163004000011215073035
* $ ./ip_overflow_chk 74.52.118.29 0xdeadbeef4a34761d
* $ ./ip_overflow_chk 74.52.118.29 0xdeadc0de4a34761d
* $ ./ip_overflow_chk 74.52.118.29 0xbadcafe4a34761d
* ... many others ...
*
* e.g. From Firefox, goto: http://0xbadcafe4a34761d
*
* -Cody Tubbs :: Started in 2015, updated and published on 2018-04-13
*
*
* Based on buggy sourcecode: inet_addr.c from OpenBSD and OpenSSH
* SSH_VERSION "OpenSSH_7.5" and SSH_PORTABLE "p1-snap20170527" to
* be exact. The bug was introduced well before this version/copy.
* headers below this are for historical && copyright purposes.
*/
/* $OpenBSD: inet_addr.c,v 1.9 2005/08/06 20:30:03 espie Exp $ */
/* OPENBSD ORIGINAL: lib/libc/net/inet_addr.c */
/*
* Copyright (c) 1983, 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* -
* Portions Copyright (c) 1993 by Digital Equipment Corporation.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies, and that
* the name of Digital Equipment Corporation not be used in advertising or
* publicity pertaining to distribution of the document or software without
* specific, written prior permission.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
* CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
* -
* --Copyright--
*/
#include <sys/types.h>
#include <sys/param.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <errno.h>
extern int printf (const char *, ...);
extern void exit(int) __attribute__((noreturn));
extern char *strerror(int);
int inet_aton(const char *, struct in_addr *);
int main(int argc, char **argv){
if (argc < 3) {
printf("Usage: %s <base IP> <test IP>\n", argv[0]);
exit(1);
}
char *valid_ip = argv[1];
char *test_ip = argv[2];
char valid_addr[INET_ADDRSTRLEN];
char test_addr[INET_ADDRSTRLEN];
struct in_addr val;
struct in_addr tst;
if (inet_aton(valid_ip, &val)) {
if (inet_ntop(AF_INET, &(val.s_addr), valid_addr, INET_ADDRSTRLEN) == NULL) { // Returns NULL / sets errno
printf("error during base IP -> inet_ntop(): %s", strerror(errno));
exit(1);
} else {
printf("BASE IP: inet_aton() -> inet_ntop(): %s\n", valid_addr);
if (inet_aton(test_ip, &tst)) {
if (inet_ntop(AF_INET, &(tst.s_addr), test_addr, INET_ADDRSTRLEN) == NULL) { // Returns NULL / sets errno
printf("error during test IP -> inet_ntop(): %s", strerror(errno));
exit(1);
} else {
printf("TEST IP: inet_aton() -> inet_ntop(): %s\n", test_addr); // prints the dotted-quad/octet IP
}
}
}
}
if(val.s_addr == tst.s_addr) {
printf("\n%s == %s\n", valid_ip, test_ip);
} else {
printf("\n%s != %s\n", valid_ip, test_ip);
}
}
/*
* Ascii internet address interpretation routine.
* The value returned is in network order.
*/
in_addr_t inet_addr(const char *cp){
struct in_addr val;
if (inet_aton(cp, &val))
return (val.s_addr);
return (INADDR_NONE);
}
/*
* Check whether "cp" is a valid ascii representation
* of an Internet address and convert to a binary address.
* Returns 1 if the address is valid, 0 if not.
* This replaces inet_addr, the return value from which
* cannot distinguish between failure and a local broadcast address.
*/
int inet_aton(const char *cp, struct in_addr *addr){
u_int32_t val;
int base, n;
char c;
u_int parts[4];
u_int *pp = parts;
c = *cp;
for (;;) {
/*
* Collect number up to ``.''.
* Values are specified as for C:
* 0x=hex, 0=octal, isdigit=decimal.
*/
if (!isdigit(c))
return (0);
val = 0; base = 10;
if (c == '0') {
c = *++cp;
if (c == 'x' || c == 'X')
base = 16, c = *++cp;
else
base = 8;
}
for (;;) {
if (isascii(c) && isdigit(c)) {
val = (val * base) + (c - '0');
c = *++cp;
} else if (base == 16 && isascii(c) && isxdigit(c)) {
val = (val << 4) |
(c + 10 - (islower(c) ? 'a' : 'A'));
c = *++cp;
} else
break;
}
if (c == '.') {
/*
* Internet format:
* a.b.c.d
* a.b.c (with c treated as 16 bits)
* a.b (with b treated as 24 bits)
*/
if (pp >= parts + 3)
return (0);
*pp++ = val;
c = *++cp;
} else
break;
}
/*
* Check for trailing characters.
*/
if (c != '\0' && (!isascii(c) || !isspace(c)))
return (0);
/*
* Concoct the address according to the number of parts specified.
*/
n = pp - parts + 1;
switch (n) {
case 0:
return (0); /* initial nondigit */
case 1: /* a -- 32 bits */
// CT: This doesn't check if 32bit, just assumes! should return if val > 0xffffffff
// CT: uncomment next line to patch this bug... wait, it doesn't work, because it's at/below the struct level, HEH.
//if((val >= 0xffffffff) || (parts[0] >= 0xffffffff)) { printf("no\n"); return (0);} // DOESN'T WORK...
break;
case 2: /* a.b -- 8.24 bits */
if ((val > 0xffffff) || (parts[0] > 0xff))
return (0);
val |= parts[0] << 24;
break;
case 3: /* a.b.c -- 8.8.16 bits */
if ((val > 0xffff) || (parts[0] > 0xff) || (parts[1] > 0xff))
return (0);
val |= (parts[0] << 24) | (parts[1] << 16);
break;
case 4: /* a.b.c.d -- 8.8.8.8 bits */
if ((val > 0xff) || (parts[0] > 0xff) || (parts[1] > 0xff) || (parts[2] > 0xff))
return (0);
val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
break;
}
if (addr)
addr->s_addr = htonl(val);
return (1);
}