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ropgadget_patternfinder
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Implemented pattern-type datacmp. Switched to using --patterndata for all patterndata input. Implemented --patterndatamask.

This commit is contained in:
yellows8 2015-06-05 23:04:05 -04:00
parent 421a3a88a5
commit 9b2c5848fe
1 changed files with 99 additions and 29 deletions
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128
ropgadget_patternfinder.c
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@ -99,15 +99,14 @@ int main(int argc, char **argv)
int argi;
int ret;
int patterntype = -1;
int hashpattern_set = 0;
unsigned int found, findtarget=1;
unsigned char *filebuf = NULL;
unsigned char inhash[0x20];
unsigned int found, found2, findtarget=1;
unsigned char *filebuf = NULL, *patterndata = NULL, *patternmask = NULL;
unsigned char calchash[0x20];
unsigned char *inhashptr;
size_t filebufsz=0, pos, hashblocksize=0;
size_t filebufsz=0, pos, i, hashblocksize=0;
size_t patterndata_size=0, patternmask_size=0;
unsigned int tmpsize=0;
unsigned int stride = 4;
unsigned int tmpval, tmpval2;
struct stat filestat;
FILE *fbin;
@ -119,9 +118,10 @@ int main(int argc, char **argv)
printf("Usage:\n");
printf("ropgadget_patternfinder <binary path> <options>\n");
printf("Options:\n");
printf("--patterntype=<type> Selects the pattern-type, which must be one of the following(this option is required): sha256.\n");
printf("--patternsha256=<bindata> Hash every --patternsha256size bytes in the binary, for locating the target pattern. The input bindata(sha256 hash) size must be 0x20-bytes.\n");
printf("--patternsha256size=0x<hexval> See --patternsha256.\n");
printf("--patterntype=<type> Selects the pattern-type, which must be one of the following(this option is required): sha256 or datacmp. sha256: Hash every --patternsha256size bytes in the binary, for locating the target pattern. The input bindata(sha256 hash) size must be 0x20-bytes.\n");
printf("--patterndata=<bindata> Pattern data to use during searching the binary, see --patterntype.\n");
printf("--patterndatamask=<bindata> Mask data to use with pattern-type datacmp. The byte-size can be less than the size of patterndata as well. The data loaded from the filebuf is &= with this mask data.\n");
printf("--patternsha256size=0x<hexval> See --patterntype.\n");
printf("--stride=0x<hexval> In the search loop, this is the value that the pos is increased by at the end of each interation. By default this is 0x4.\n");
printf("--findtarget=0x<hexval> Stop searching once this number of matches were found, by default this is 0x1. When this is 0x0, this will not stop until the end of the binary is reached.\n");
@ -138,6 +138,10 @@ int main(int argc, char **argv)
{
patterntype = 0;
}
else if(strncmp(&argv[argi][14], "datacmp", 7)==0)
{
patterntype = 1;
}
else
{
printf("Invalid pattern-type.\n");
@ -145,20 +149,18 @@ int main(int argc, char **argv)
}
}
if(strncmp(argv[argi], "--patternsha256=", 16)==0)
if(strncmp(argv[argi], "--patterndata=", 14)==0)
{
if(strlen(&argv[argi][16]) != 0x20*2)
{
printf("Input sha256 hash size is invalid.\n");
ret = 5;
}
else
{
inhashptr = inhash;
tmpsize = 0x20;
ret = load_bindata(&argv[argi][16], &inhashptr, &tmpsize);
if(ret==0)hashpattern_set = 1;
}
tmpsize = 0;
ret = load_bindata(&argv[argi][14], &patterndata, &tmpsize);
patterndata_size = tmpsize;
}
if(strncmp(argv[argi], "--patterndatamask=", 18)==0)
{
tmpsize = 0;
ret = load_bindata(&argv[argi][18], &patternmask, &tmpsize);
patternmask_size = tmpsize;
}
if(strncmp(argv[argi], "--patternsha256size=", 20)==0)
@ -185,18 +187,36 @@ int main(int argc, char **argv)
if(patterntype==-1)
{
printf("No pattern-type specified.\n");
return 5;
ret = 5;
}
if(patterntype==0 && (hashpattern_set && hashblocksize==0))
if(patterntype==0)
{
printf("--patternsha256size must be used when --patternsha256 is used.\n");
return 5;
if(patterndata_size==0)
{
printf("--patternsha256size must be used when pattern-type is sha256.\n");
ret = 5;
}
if(patterndata_size != 0x20)
{
printf("Input hash size is invalid.\n");
ret = 5;
}
}
if(ret!=0)
{
free(patterndata);
free(patternmask);
return ret;
}
if(stat(argv[1], &filestat)==-1)
{
printf("Failed to stat the input binary: %s.\n", argv[1]);
free(patterndata);
free(patternmask);
return 1;
}
@ -205,6 +225,8 @@ int main(int argc, char **argv)
if(filebuf==NULL)
{
printf("Failed to alloc filebuf.\n");
free(patterndata);
free(patternmask);
return 2;
}
@ -213,6 +235,8 @@ int main(int argc, char **argv)
{
printf("Failed to open the input binary.\n");
free(filebuf);
free(patterndata);
free(patternmask);
return 3;
}
@ -220,6 +244,8 @@ int main(int argc, char **argv)
{
printf("Failed to read the input binary.\n");
free(filebuf);
free(patterndata);
free(patternmask);
fclose(fbin);
return 4;
}
@ -231,10 +257,52 @@ int main(int argc, char **argv)
for(pos=0; pos<filebufsz; pos+=stride)
{
if(filebufsz - pos < hashblocksize)break;
tmpval = 0;
SHA256(&filebuf[pos], hashblocksize, calchash);
if(memcmp(inhash, calchash, 0x20)==0)
if(patterntype==0)
{
if(filebufsz - pos < hashblocksize)break;
SHA256(&filebuf[pos], hashblocksize, calchash);
if(memcmp(patterndata, calchash, 0x20)==0)
{
tmpval = 1;
}
}
else if(patterntype==1)
{
if(filebufsz - pos < patterndata_size)break;
if(patternmask==NULL)
{
if(memcmp(patterndata, &filebuf[pos], patterndata_size)==0)
{
tmpval = 1;
}
}
else
{
found2 = 1;
for(i=0; i<patterndata_size; i++)
{
tmpval2 = filebuf[pos+i];
if(i<patternmask_size)tmpval2 &= patternmask[i];
if(tmpval2 != patterndata[i])
{
found2 = 0;
break;
}
}
if(found2)tmpval = 1;
}
}
if(tmpval)
{
printf("Found the pattern at 0x%x.\n", (unsigned int)pos);
found++;
@ -253,6 +321,8 @@ int main(int argc, char **argv)
}
free(filebuf);
free(patterndata);
free(patternmask);
return ret;
}