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/* keepass2john utility (modified KeeCracker) written in March of 2012
* by Dhiru Kholia. keepass2john processes input KeePass 1.x and 2.x
* database files into a format suitable for use with JtR. This software
* is Copyright (c) 2012, Dhiru Kholia <dhiru.kholia at gmail.com> and it
* is hereby released under GPL license.
*
* KeePass 2.x support is based on KeeCracker - The KeePass 2 Database
* Cracker, http://keecracker.mbw.name/
*
* KeePass 1.x support is based on kppy - A Python-module to provide
* an API to KeePass 1.x files. https://github.com/raymontag/kppy
* Copyright (C) 2012 Karsten-Kai König <kkoenig@posteo.de>
*
* Keyfile support for Keepass 1.x and Keepass 2.x was added by Fist0urs
* <eddy.maaalou at gmail.com>
*
* kppy is free software: you can redistribute it and/or modify it under the terms
* of the GNU General Public License as published by the Free Software Foundation,
* either version 3 of the License, or at your option) any later version.
*
* kppy is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with
* kppy. If not, see <http://www.gnu.org/licenses/>. */
#if AC_BUILT
#include "autoconfig.h"
#endif
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
#ifdef _MSC_VER
#include "missing_getopt.h"
#endif
#include <errno.h>
// needs to be above sys/types.h and sys/stat.h for mingw, if -std=c99 used.
#include "jumbo.h"
#include <sys/stat.h>
#include <sys/types.h>
#if (!AC_BUILT || HAVE_UNISTD_H) && !_MSC_VER
#include <unistd.h> // getopt defined here for unix
#endif
#include "params.h"
#include "memory.h"
#include "sha2.h"
#include "base64_convert.h"
const char *extension[] = {".kdbx"};
static char *keyfile = NULL;
// KeePass 1.x signature
uint32_t FileSignatureOld1 = 0x9AA2D903;
uint32_t FileSignatureOld2 = 0xB54BFB65;
/// <summary>
/// File identifier, first 32-bit value.
/// </summary>
uint32_t FileSignature1 = 0x9AA2D903;
/// <summary>
/// File identifier, second 32-bit value.
/// </summary>
uint32_t FileSignature2 = 0xB54BFB67;
// KeePass 2.x pre-release (alpha and beta) signature
uint32_t FileSignaturePreRelease1 = 0x9AA2D903;
uint32_t FileSignaturePreRelease2 = 0xB54BFB66;
uint32_t FileVersionCriticalMask = 0xFFFF0000;
/// <summary>
/// File version of files saved by the current <c>Kdb4File</c> class.
/// KeePass 2.07 has version 1.01, 2.08 has 1.02, 2.09 has 2.00,
/// 2.10 has 2.02, 2.11 has 2.04, 2.15 has 3.00.
/// The first 2 bytes are critical (i.e. loading will fail, if the
/// file version is too high), the last 2 bytes are informational.
/// </summary>
// uint32_t FileVersion32 = 0x00030000;
uint32_t FileVersion32 = 0x00040000;
uint32_t FileVersion32_4 = 0x00040000; // from KeePass 2.36 sources
// We currently support database formats up to KDBX v3.x. KDBX 4.x is not
// supported yet. See "KdbxFile.cs" in KeePass 2.36 for more information on
// KDBX 4.x format.
enum Kdb4HeaderFieldID
{
EndOfHeader = 0,
CipherID = 2,
MasterSeed = 4,
TransformSeed = 5, // KDBX 3.1, for backward compatibility only
TransformRounds = 6, // KDBX 3.1, for backward compatibility only
EncryptionIV = 7,
StreamStartBytes = 9, // KDBX 3.1, for backward compatibility only
KdfParameters = 11, // KDBX 4, superseding Transform*
};
static off_t get_file_size(char * filename)
{
struct stat sb;
if (stat(filename, & sb) != 0) {
fprintf(stderr, "! %s : stat failed, %s\n", filename, strerror(errno));
exit(-2);
}
return sb.st_size;
}
static void print_hex(unsigned char *str, int len)
{
int i;
for (i = 0; i < len; ++i)
printf("%02x", str[i]);
}
static uint64_t BytesToUInt64(unsigned char * s, const int s_size)
{
int i;
uint64_t v = 0;
for (i = 0; i < 8 && i < s_size; i++)
v |= (uint64_t)s[i] << 8 * i;
return v;
}
static uint32_t fget32(FILE * fp)
{
uint32_t v = (uint32_t)fgetc(fp);
v |= (uint32_t)fgetc(fp) << 8;
v |= (uint32_t)fgetc(fp) << 16;
v |= (uint32_t)fgetc(fp) << 24;
return v;
}
static uint16_t fget16(FILE * fp)
{
uint32_t v = fgetc(fp);
v |= fgetc(fp) << 8;
return v;
}
static void warn(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
if (fmt != NULL)
vfprintf(stderr, fmt, ap);
va_end(ap);
fprintf(stderr, "\n");
// exit(EXIT_FAILURE);
}
/* process KeePass 1.x databases */
static void process_old_database(FILE *fp, char* encryptedDatabase)
{
uint32_t enc_flag;
uint32_t version;
unsigned char final_randomseed[16];
unsigned char enc_iv[16];
unsigned char contents_hash[32];
unsigned char transf_randomseed[32];
uint32_t num_groups;
uint32_t num_entries;
uint32_t key_transf_rounds;
unsigned char *buffer;
int64_t filesize = 0;
int64_t datasize;
int algorithm = -1;
char *dbname;
FILE *kfp = NULL;
/* specific to keyfile handling */
int64_t filesize_keyfile = 0;
SHA256_CTX ctx;
unsigned char hash[32];
int counter;
enc_flag = fget32(fp);
version = fget32(fp);
if (fread(final_randomseed, 16, 1, fp) != 1) {
warn("%s: Error: read failed: %s.", encryptedDatabase,
strerror(errno));
return;
}
if (fread(enc_iv, 16, 1, fp) != 1) {
warn("%s: Error: read failed: %s.", encryptedDatabase,
strerror(errno));
return;
}
num_groups = fget32(fp);
num_entries = fget32(fp);
(void)num_groups;
(void)num_entries;
if (fread(contents_hash, 32, 1, fp) != 1) {
warn("%s: Error: read failed: %s.", encryptedDatabase,
strerror(errno));
return;
}
if (fread(transf_randomseed, 32, 1, fp) != 1) {
warn("%s: Error: read failed: %s.", encryptedDatabase,
strerror(errno));
return;
}
key_transf_rounds = fget32(fp);
/* Check if the database is supported */
if ((version & 0xFFFFFF00) != (0x00030002 & 0xFFFFFF00)) {
fprintf(stderr, "! %s : Unsupported file version (%u)!\n", encryptedDatabase, version);
return;
}
/* src/Kdb3Database.cpp from KeePass 0.4.3 is authoritative */
if (enc_flag & 2) {
algorithm = 0; // AES
} else if (enc_flag & 8) {
algorithm = 1; // Twofish
} else {
fprintf(stderr, "! %s : Unsupported file encryption (%u)!\n", encryptedDatabase, enc_flag);
return;
}
/* keyfile processing */
if (keyfile) {
kfp = fopen(keyfile, "rb");
if (!kfp) {
fprintf(stderr, "! %s : %s\n", keyfile, strerror(errno));
return;
}
filesize_keyfile = (int64_t)get_file_size(keyfile);
}
dbname = strip_suffixes(basename(encryptedDatabase), extension, 1);
filesize = (int64_t)get_file_size(encryptedDatabase);
datasize = filesize - 124;
if (datasize < 0) {
warn("%s: Error in validating datasize.", encryptedDatabase);
return;
}
// offset (124) field below is not used, we hijack it to convey the
// algorithm.
// printf("%s:$keepass$*1*%d*%d*", dbname, key_transf_rounds, 124);
printf("%s:$keepass$*1*%d*%d*", dbname, key_transf_rounds, algorithm);
print_hex(final_randomseed, 16);
printf("*");
print_hex(transf_randomseed, 32);
printf("*");
print_hex(enc_iv, 16);
printf("*");
print_hex(contents_hash, 32);
buffer = (unsigned char*)malloc(datasize * sizeof(char));
/* we inline the content with the hash */
fprintf(stderr, "Inlining %s\n", encryptedDatabase);
printf("*1*%"PRId64"*", datasize);
fseek(fp, 124, SEEK_SET);
if (fread(buffer, datasize, 1, fp) != 1) {
warn("%s: Error: read failed: %s.",
encryptedDatabase, strerror(errno));
MEM_FREE(buffer);
return;
}
print_hex(buffer, datasize);
MEM_FREE(buffer);
if (keyfile) {
buffer = (unsigned char*)malloc(filesize_keyfile * sizeof(char));
printf("*1*64*"); /* inline keyfile content */
if (fread(buffer, filesize_keyfile, 1, kfp) != 1) {
warn("%s: Error: read failed: %s.",
encryptedDatabase, strerror(errno));
return;
}
/* as in Keepass 1.x implementation:
* if filesize_keyfile == 32 then assume byte_array
* if filesize_keyfile == 64 then assume hex(byte_array)
* else byte_array = sha256(keyfile_content)
*/
if (filesize_keyfile == 32)
print_hex(buffer, filesize_keyfile);
else if (filesize_keyfile == 64){
for (counter = 0; counter <64; counter++)
printf("%c", buffer[counter]);
}
else{
/* precompute sha256 to speed-up cracking */
SHA256_Init(&ctx);
SHA256_Update(&ctx, buffer, filesize_keyfile);
SHA256_Final(hash, &ctx);
print_hex(hash, 32);
}
MEM_FREE(buffer);
}
printf("\n");
}
// Synchronize with KdbxFile.Read.cs from KeePass 2.x
static void process_database(char* encryptedDatabase)
{
// long dataStartOffset;
unsigned long transformRounds = 0;
unsigned char *masterSeed = NULL;
int masterSeedLength = 0;
unsigned char *transformSeed = NULL;
int transformSeedLength = 0;
unsigned char *initializationVectors = NULL;
int initializationVectorsLength = 0;
unsigned char *expectedStartBytes = NULL;
int endReached, expectedStartBytesLength = 0;
uint32_t uSig1, uSig2, uVersion;
FILE *fp;
unsigned char out[32];
char *dbname;
long algorithm = 0; // 0 -> AES
size_t fsize = 0;
/* specific to keyfile handling */
unsigned char *buffer;
int64_t filesize_keyfile = 0;
char *p;
char *data;
char b64_decoded[128+1];
FILE *kfp = NULL;
SHA256_CTX ctx;
unsigned char hash[32];
int counter;
fp = fopen(encryptedDatabase, "rb");
if (!fp) {
fprintf(stderr, "! %s : %s\n", encryptedDatabase, strerror(errno));
return;
}
fseek(fp, 0, SEEK_END);
fsize = ftell(fp);
fseek(fp, 0, SEEK_SET);
uSig1 = fget32(fp);
uSig2 = fget32(fp);
if ((uSig1 == FileSignatureOld1) && (uSig2 == FileSignatureOld2)) {
process_old_database(fp, encryptedDatabase);
fclose(fp);
return;
}
if ((uSig1 == FileSignature1) && (uSig2 == FileSignature2)) {
}
else if ((uSig1 == FileSignaturePreRelease1) && (uSig2 == FileSignaturePreRelease2)) {
}
else {
fprintf(stderr, "! %s : Unknown format: File signature invalid\n", encryptedDatabase);
fclose(fp);
return;
}
uVersion = fget32(fp);
if ((uVersion & FileVersionCriticalMask) > (FileVersion32 & FileVersionCriticalMask)) {
fprintf(stderr, "! %s : Unknown format: File version '%x' unsupported\n", encryptedDatabase, uVersion);
fclose(fp);
return;
}
endReached = 0;
while (!endReached) {
uint32_t uSize;
unsigned char btFieldID = fgetc(fp);
enum Kdb4HeaderFieldID kdbID = btFieldID;
unsigned char *pbData = NULL;
if (uVersion < FileVersion32_4)
uSize = fget16(fp);
else
uSize = fget32(fp);
if (fsize * 64 < uSize) {
fprintf(stderr, "uSize too large, is the database corrupt?\n");
goto bailout;
}
if (uSize == 0 && (kdbID != EndOfHeader)) {
fprintf(stderr, "error validating uSize for EndOfHeader, is the database corrupt?\n");
goto bailout;
}
if (uSize > 0) {
pbData = (unsigned char*)malloc(uSize);
if (!pbData || fread(pbData, uSize, 1, fp) != 1) {
fprintf(stderr, "error allocating / reading pbData, is the database corrupt?\n");
MEM_FREE(pbData);
goto bailout;
}
}
switch (kdbID)
{
case EndOfHeader:
endReached = 1; // end of header
MEM_FREE(pbData);
break;
case MasterSeed:
if (masterSeed)
MEM_FREE(masterSeed);
masterSeed = pbData;
masterSeedLength = uSize;
break;
case TransformSeed: // Obsolete in FileVersion32_4; for backward compatibility only
if (transformSeed)
MEM_FREE(transformSeed);
transformSeed = pbData;
transformSeedLength = uSize;
break;
case TransformRounds: // Obsolete in FileVersion32_4; for backward compatibility only
if (uSize < 4) {
fprintf(stderr, "error validating uSize for TransformRounds, is the database corrupt?\n");
MEM_FREE(pbData);
goto bailout;
}
if (!pbData) {
fprintf(stderr, "! %s : parsing failed (pbData is NULL), please open a bug if target is valid KeepPass database.\n", encryptedDatabase);
goto bailout;
}
else {
transformRounds = BytesToUInt64(pbData, uSize);
MEM_FREE(pbData);
}
break;
case EncryptionIV:
if (initializationVectors)
MEM_FREE(initializationVectors);
initializationVectors = pbData;
initializationVectorsLength = uSize;
break;
case StreamStartBytes: // Not present in FileVersion32_4
if (expectedStartBytes)
MEM_FREE(expectedStartBytes);
expectedStartBytes = pbData;
expectedStartBytesLength = uSize;
break;
case CipherID:
// pbData == 31c1f2e6bf714350be5805216afc5aff => AES ("Standard" KDBX 3.1)
// pbData == d6038a2b8b6f4cb5a524339a31dbb59a => ChaCha20
// pbData == ad68f29f576f4bb9a36ad47af965346c => TwoFish
if (uSize < 4) {
fprintf(stderr, "error validating uSize for CipherID, is the database corrupt?\n");
MEM_FREE(pbData);
goto bailout;
}
if (memcmp(pbData, "\xd6\x03\x8a\x2b", 4) == 0) {
// fprintf(stderr, "! %s : ChaCha20 usage is not supported yet!\n", encryptedDatabase);
// MEM_FREE(pbData);
algorithm = 2;
// goto bailout;
}
/* if (memcmp(pbData, "\x31\xc1\xf2\xe6", 4) != 0) {
fprintf(stderr, "! %s : Unsupported CipherID found!\n", encryptedDatabase);
MEM_FREE(pbData);
goto bailout;
} */
default:
MEM_FREE(pbData);
break;
}
}
// dataStartOffset = ftell(fp);
if (transformRounds == 0 && uVersion < FileVersion32_4) {
fprintf(stderr, "! %s : transformRounds can't be 0\n", encryptedDatabase);
goto bailout;
}
#ifdef KEEPASS_DEBUG
fprintf(stderr, "%d, %d, %d, %d\n", masterSeedLength, transformSeedLength, initializationVectorsLength, expectedStartBytesLength);
#endif
if ((uVersion < FileVersion32_4) && (!masterSeed || !transformSeed || !initializationVectors || !expectedStartBytes)) {
fprintf(stderr, "! %s : parsing failed, please open a bug if target is valid KeepPass database.\n", encryptedDatabase);
goto bailout;
}
if (uVersion >= FileVersion32_4) {
fprintf(stderr, "! %s : File version '%x' is currently not supported!\n", encryptedDatabase, uVersion);
goto bailout;
}
if (keyfile) {
kfp = fopen(keyfile, "rb");
if (!kfp) {
fprintf(stderr, "! %s : %s\n", keyfile, strerror(errno));
return;
}
filesize_keyfile = (int64_t)get_file_size(keyfile);
}
dbname = strip_suffixes(basename(encryptedDatabase),extension, 1);
// printf("%s:$keepass$*2*%ld*%ld*", dbname, transformRounds, dataStartOffset);
printf("%s:$keepass$*2*%ld*%ld*", dbname, transformRounds, algorithm); // dataStartOffset field is now used to convey algorithm information
print_hex(masterSeed, masterSeedLength);
printf("*");
print_hex(transformSeed, transformSeedLength);
printf("*");
print_hex(initializationVectors, initializationVectorsLength);
printf("*");
print_hex(expectedStartBytes, expectedStartBytesLength);
if (fread(out, 32, 1, fp) != 1) {
fprintf(stderr, "error reading encrypted data!\n");
goto bailout;
}
printf("*");
print_hex(out, 32);
if (keyfile) {
buffer = (unsigned char*)malloc(filesize_keyfile * sizeof(char));
printf("*1*64*"); /* inline keyfile content */
if (fread(buffer, filesize_keyfile, 1, kfp) != 1) {
warn("%s: Error: read failed: %s.",
encryptedDatabase, strerror(errno));
return;
}
/* as in Keepass 2.x implementation:
* if keyfile is an xml, get <Data> content
* if filesize_keyfile == 32 then assume byte_array
* if filesize_keyfile == 64 then assume hex(byte_array)
* else byte_array = sha256(keyfile_content)
*/
if (!memcmp((char *) buffer, "<?xml", 5)
&& ((p = strstr((char *) buffer, "<Key>")) != NULL)
&& ((p = strstr(p, "<Data>")) != NULL)
)
{
p += strlen("<Data>");
data = p;
p = strstr(p, "</Data>");
printf ("%s", base64_convert_cp(data, e_b64_mime, p - data, b64_decoded, e_b64_hex, sizeof(b64_decoded), flg_Base64_NO_FLAGS, 0));
}
else if (filesize_keyfile == 32)
print_hex(buffer, filesize_keyfile);
else if (filesize_keyfile == 64)
{
for (counter = 0; counter <64; counter++)
printf("%c", buffer[counter]);
}
else
{
/* precompute sha256 to speed-up cracking */
SHA256_Init(&ctx);
SHA256_Update(&ctx, buffer, filesize_keyfile);
SHA256_Final(hash, &ctx);
print_hex(hash, 32);
}
MEM_FREE(buffer);
}
printf("\n");
bailout:
MEM_FREE(masterSeed);
MEM_FREE(transformSeed);
MEM_FREE(initializationVectors);
MEM_FREE(expectedStartBytes);
fclose(fp);
}
#ifndef HAVE_LIBFUZZER
static int usage(char *name)
{
fprintf(stderr, "Usage: %s [-k <keyfile>] <.kdbx database(s)>\n", name);
return EXIT_FAILURE;
}
int main(int argc, char **argv)
{
int c;
errno = 0;
/* Parse command line */
while ((c = getopt(argc, argv, "k:")) != -1) {
switch (c) {
case 'k':
keyfile = (char *)malloc(strlen(optarg) + 1);
strcpy(keyfile, optarg);
break;
case '?':
default:
return usage(argv[0]);
}
}
argc -= optind;
if (argc == 0)
return usage(argv[0]);
argv += optind;
while(argc--)
process_database(*argv++);
return 0;
}
#endif
#ifdef HAVE_LIBFUZZER
int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
{
int fd;
char name[] = "/tmp/libFuzzer-XXXXXX";
fd = mkstemp(name); // this approach is somehow faster than the fmemopen way
if (fd < 0) {
fprintf(stderr, "Problem detected while creating the input file, %s, aborting!\n", strerror(errno));
exit(-1);
}
write(fd, data, size);
close(fd);
process_database(name);
remove(name);
return 0;
}
#endif