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nmap/nping/Crypto.cc

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/***************************************************************************
* Crypto.cc -- The Crypto Class contains miscellanious methods and helpers*
* that may be used to provide properties such as authentication, integrity*
* or confidentiality. *
* *
***********************IMPORTANT NMAP LICENSE TERMS************************
* *
* The Nmap Security Scanner is (C) 1996-2012 Insecure.Com LLC. Nmap is *
* also a registered trademark of Insecure.Com LLC. This program is free *
* software; you may redistribute and/or modify it under the terms of the *
* GNU General Public License as published by the Free Software *
* Foundation; Version 2 with the clarifications and exceptions described *
* below. This guarantees your right to use, modify, and redistribute *
* this software under certain conditions. If you wish to embed Nmap *
* technology into proprietary software, we sell alternative licenses *
* (contact sales@insecure.com). Dozens of software vendors already *
* license Nmap technology such as host discovery, port scanning, OS *
* detection, version detection, and the Nmap Scripting Engine. *
* *
* Note that the GPL places important restrictions on "derived works", yet *
* it does not provide a detailed definition of that term. To avoid *
* misunderstandings, we interpret that term as broadly as copyright law *
* allows. For example, we consider an application to constitute a *
* "derivative work" for the purpose of this license if it does any of the *
* following: *
* o Integrates source code from Nmap *
* o Reads or includes Nmap copyrighted data files, such as *
* nmap-os-db or nmap-service-probes. *
* o Executes Nmap and parses the results (as opposed to typical shell or *
* execution-menu apps, which simply display raw Nmap output and so are *
* not derivative works.) *
* o Integrates/includes/aggregates Nmap into a proprietary executable *
* installer, such as those produced by InstallShield. *
* o Links to a library or executes a program that does any of the above *
* *
* The term "Nmap" should be taken to also include any portions or derived *
* works of Nmap, as well as other software we distribute under this *
* license such as Zenmap, Ncat, and Nping. This list is not exclusive, *
* but is meant to clarify our interpretation of derived works with some *
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* speak for other people's GPL works. *
* *
* If you have any questions about the GPL licensing restrictions on using *
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* we also offer alternative license to integrate Nmap into proprietary *
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* of software vendors, and generally include a perpetual license as well *
* as providing for priority support and updates. They also fund the *
* continued development of Nmap. Please email sales@insecure.com for *
* further information. *
* *
* As a special exception to the GPL terms, Insecure.Com LLC grants *
* permission to link the code of this program with any version of the *
* OpenSSL library which is distributed under a license identical to that *
* listed in the included docs/licenses/OpenSSL.txt file, and distribute *
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* but you are not obligated to do so. *
* *
* If you received these files with a written license agreement or *
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* *
* Source is provided to this software because we believe users have a *
* right to know exactly what a program is going to do before they run it. *
* This also allows you to audit the software for security holes (none *
* have been found so far). *
* *
* Source code also allows you to port Nmap to new platforms, fix bugs, *
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* unlimited, non-exclusive right to reuse, modify, and relicense the *
* code. Nmap will always be available Open Source, but this is important *
* because the inability to relicense code has caused devastating problems *
* for other Free Software projects (such as KDE and NASM). We also *
* occasionally relicense the code to third parties as discussed above. *
* If you wish to specify special license conditions of your *
* contributions, just say so when you send them. *
* *
* This program 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 v2.0 for more details at *
* http://www.gnu.org/licenses/gpl-2.0.html , or in the COPYING file *
* included with Nmap. *
* *
***************************************************************************/
#include "nping.h"
#include "Crypto.h"
#include "output.h"
#include "NpingOps.h"
#ifdef HAVE_OPENSSL
#include <openssl/hmac.h>
#include <openssl/evp.h>
#include <openssl/err.h>
#endif
extern NpingOps o;
Crypto::Crypto(){
this->reset();
} /* End of Crypto constructor */
Crypto::~Crypto(){
} /* End of Crypto destructor */
/** Sets every attribute to its default value. */
void Crypto::reset() {
} /* End of reset() */
int Crypto::hmac_sha256(u8 *inbuff, size_t inlen, u8 *dst_buff, u8 *key, size_t key_len){
#ifdef HAVE_OPENSSL
if( o.doCrypto() ){
u8 result[EVP_MAX_MD_SIZE];
memset(result, 0, EVP_MAX_MD_SIZE);
unsigned int result_len;
HMAC(EVP_sha256(), key, (int)key_len, inbuff, (int)inlen, result, &result_len);
memcpy(dst_buff, result, 256/8);
return OP_SUCCESS;
}
#endif
/* Set a bogus sum: all zero */
memset(dst_buff, 0, HMAC_SHA256_CODE_LEN);
return OP_SUCCESS;
} /* End of hmac_sha256() */
int Crypto::aes128_cbc_encrypt(u8 *inbuff, size_t inlen, u8 *dst_buff, u8 *key, size_t key_len, u8 *iv){
outPrint(DBG_4, "%s(%p, %lu, %p, %p, %lu, %p)", __func__, inbuff, (unsigned long)inlen, dst_buff, key, (unsigned long)key_len, iv);
if(inbuff==NULL || dst_buff==NULL || key==NULL || iv==NULL)
return OP_FAILURE;
if( ((inlen%AES_BLOCK_SIZE)!=0) || key_len<AES_KEY_SIZE)
return OP_FAILURE;
#ifdef HAVE_OPENSSL
if( o.doCrypto() ){
int flen=0, flen2=0;
EVP_CIPHER_CTX ctx;
EVP_CIPHER_CTX_init(&ctx);
EVP_CIPHER_CTX_set_padding(&ctx, 0);
int result=OP_SUCCESS;
if( EVP_EncryptInit(&ctx, EVP_aes_128_cbc(), key, iv)==0 ){
outPrint(DBG_4, "EVP_EncryptInit() failed");
result=OP_FAILURE;
}else if( EVP_EncryptUpdate(&ctx, dst_buff, &flen, inbuff, (int)inlen)==0 ){
outPrint(DBG_4, "EVP_EncryptUpdate() failed");
result=OP_FAILURE;
}else if( EVP_EncryptFinal(&ctx, dst_buff+flen, &flen2)==0 ){
outPrint(DBG_4, "EVP_EncryptFinal() failed");
result=OP_FAILURE;
}
EVP_CIPHER_CTX_cleanup(&ctx);
return result;
}
#endif
/* Do not encrypt, just set the plaintext */
for(size_t i=0; i<inlen; i++)
dst_buff[i]=inbuff[i];
return OP_SUCCESS;
} /* End of aes128_cbc_encrypt() */
int Crypto::aes128_cbc_decrypt(u8 *inbuff, size_t inlen, u8 *dst_buff, u8 *key, size_t key_len, u8 *iv){
outPrint(DBG_4, "%s(%p, %lu, %p, %p, %lu, %p)", __func__, inbuff, (unsigned long)inlen, dst_buff, key, (unsigned long)key_len, iv);
if(inbuff==NULL || dst_buff==NULL || key==NULL || iv==NULL)
return OP_FAILURE;
if( ((inlen%AES_BLOCK_SIZE)!=0) || key_len<AES_KEY_SIZE)
return OP_FAILURE;
#ifdef HAVE_OPENSSL
if( o.doCrypto() ){
int flen1=0, flen2=0;
EVP_CIPHER_CTX ctx;
EVP_CIPHER_CTX_init(&ctx);
EVP_CIPHER_CTX_set_padding(&ctx, 0);
int result=OP_SUCCESS;
if( EVP_DecryptInit(&ctx, EVP_aes_128_cbc(), key, iv)==0 ){
outPrint(DBG_4, "EVP_DecryptInit() failed");
result=OP_FAILURE;
}else if( EVP_DecryptUpdate(&ctx, dst_buff, &flen1, inbuff, (int)inlen)==0 ){
outPrint(DBG_4, "EVP_DecryptUpdate() failed");
result=OP_FAILURE;
}else if( EVP_DecryptFinal(&ctx, dst_buff+flen1, &flen2)==0 ){
outPrint(DBG_4, "OpenSSL bug: it says EVP_DecryptFinal() failed when it didn't (%s).",
ERR_error_string(ERR_peek_last_error(), NULL));
/* We do not return OP_FAILURE in this case because the
* EVP_DecryptFinal() function seems to be buggy and fails when it shouldn't.
* We are passing a buffer whose length is multiple of the AES block
* size, we've disable padding, and still, the call fails.
* The call to EVP_DecryptUpdate() says we've decrypted all blocks but
* the last one and then EVP_DecryptFinal says we have decrypted nothing.
* However I've tested this for hours and everything works fine. The
* full buffer is decrypted correctly, from the first to the last byte,
* so we return OP_SUCCESS even if OpenSSL says the opossite. */
/* NOTE for developers debugging memory issues with Valgrind:
* None of these seems to free OpenSSL's internal error structures.
* Valgrind currently reports things like:
==12849== 592 bytes in 1 blocks are still reachable in loss record 7 of 9
==12849== at 0x4C284A8: malloc (vg_replace_malloc.c:236)
==12849== by 0x531BF21: CRYPTO_malloc (in /lib/libcrypto.so.0.9.8)
==12849== by 0x537F25D: ERR_get_state (in /lib/libcrypto.so.0.9.8)
==12849== by 0x537E7BE: ERR_put_error (in /lib/libcrypto.so.0.9.8)
==12849== by 0x5381EB0: EVP_DecryptFinal_ex (in /lib/libcrypto.so.0.9.8)
==12849== by 0x429A49: Crypto::aes128_cbc_decrypt(unsigned char*...
==12849== by 0x41ABBA: EchoHeader::decrypt(unsigned char*, unsign...
*/
//ERR_clear_error();
//ERR_free_strings();
//ERR_pop_to_mark();
}
EVP_CIPHER_CTX_cleanup(&ctx);
return result;
}
#endif
/* Do not decrypt, just leave the ciphertext */
for(size_t i=0; i<inlen; i++)
dst_buff[i]=inbuff[i];
return OP_SUCCESS;
} /* End of aes128_cbc_decrypt() */
int Crypto::generateNonce(u8 *dst_buff, size_t bufflen){
outPrint(DBG_4, "%s()", __func__);
if(dst_buff==NULL || bufflen<=0)
return OP_FAILURE;
#ifdef HAVE_OPENSSL
// Get cryptographically secure random data from OpenSSL
// @todo TODO finish this.
get_random_bytes(dst_buff, bufflen); /* Provided by nbase */
#else
get_random_bytes(dst_buff, bufflen); /* Provided by nbase */
#endif
return OP_SUCCESS;
} /* End of generateNonce() */
#define TIMES_KEY_DERIVATION 1000
u8 *Crypto::deriveKey(const u8 *from, size_t fromlen, size_t *final_len){
outPrint(DBG_4, "%s()", __func__);
if(from==NULL || fromlen==0)
return NULL;
#ifdef HAVE_OPENSSL
if( o.doCrypto() ){
static u8 hash[MAX(SHA256_HASH_LEN, EVP_MAX_MD_SIZE)];
static u8 next[MAX(SHA256_HASH_LEN, EVP_MAX_MD_SIZE)];
unsigned int lastlen;
EVP_MD_CTX ctx;
EVP_MD_CTX_init(&ctx);
if( EVP_MD_size(EVP_sha256()) != SHA256_HASH_LEN )
outFatal(QT_2, "OpenSSL is broken. SHA256 len is %d\n", EVP_MD_size(EVP_sha256()) );
/* Compute the SHA256 hash of the supplied buffer */
EVP_DigestInit(&ctx, EVP_sha256());
EVP_DigestUpdate(&ctx, from, fromlen);
EVP_DigestFinal(&ctx, hash, &lastlen);
/* Now compute the 1000th hash of that hash */
for(int i=0; i<TIMES_KEY_DERIVATION; i++){
EVP_MD_CTX_init(&ctx);
EVP_DigestInit(&ctx, EVP_sha256());
EVP_DigestUpdate(&ctx, hash, SHA256_HASH_LEN);
EVP_DigestFinal(&ctx, next, &lastlen);
memcpy(hash, next, SHA256_HASH_LEN);
}
if(final_len!=NULL)
*final_len=SHA256_HASH_LEN;
EVP_MD_CTX_cleanup(&ctx);
return hash;
}
#endif
static u8 zerohash[SHA256_HASH_LEN];
memset(zerohash, 0, SHA256_HASH_LEN);
if(final_len!=NULL)
*final_len=SHA256_HASH_LEN;
return zerohash;
} /* End of deriveKey() */
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