mirror of
https://github.com/nmap/nmap.git
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aedd25c3a2
Add some checks to know which OpenSSL version is used, to be sure the code follows the syntax of the version used (including 1.1.0).
389 lines
19 KiB
C++
389 lines
19 KiB
C++
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/***************************************************************************
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* Crypto.cc -- The Crypto Class contains miscellaneous methods and helpers*
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* that may be used to provide properties such as authentication, integrity*
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* or confidentiality. *
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* *
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***********************IMPORTANT NMAP LICENSE TERMS************************
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* *
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* The Nmap Security Scanner is (C) 1996-2016 Insecure.Com LLC. Nmap is *
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* also a registered trademark of Insecure.Com LLC. This program is free *
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* software; you may redistribute and/or modify it under the terms of the *
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* GNU General Public License as published by the Free Software *
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* Foundation; Version 2 ("GPL"), BUT ONLY WITH ALL OF THE CLARIFICATIONS *
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* AND EXCEPTIONS DESCRIBED HEREIN. This guarantees your right to use, *
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* modify, and redistribute this software under certain conditions. If *
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* you wish to embed Nmap technology into proprietary software, we sell *
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* alternative licenses (contact sales@nmap.com). Dozens of software *
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* vendors already license Nmap technology such as host discovery, port *
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* scanning, OS detection, version detection, and the Nmap Scripting *
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* Engine. *
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* *
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* Note that the GPL places important restrictions on "derivative works", *
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* yet it does not provide a detailed definition of that term. To avoid *
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* misunderstandings, we interpret that term as broadly as copyright law *
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* allows. For example, we consider an application to constitute a *
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* derivative work for the purpose of this license if it does any of the *
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* following with any software or content covered by this license *
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* ("Covered Software"): *
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* *
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* o Integrates source code from Covered Software. *
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* *
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* o Reads or includes copyrighted data files, such as Nmap's nmap-os-db *
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* or nmap-service-probes. *
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* *
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* o Is designed specifically to execute Covered Software and parse the *
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* results (as opposed to typical shell or execution-menu apps, which will *
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* execute anything you tell them to). *
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* *
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* o Includes Covered Software in a proprietary executable installer. The *
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* installers produced by InstallShield are an example of this. Including *
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* Nmap with other software in compressed or archival form does not *
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* trigger this provision, provided appropriate open source decompression *
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* or de-archiving software is widely available for no charge. For the *
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* purposes of this license, an installer is considered to include Covered *
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* Software even if it actually retrieves a copy of Covered Software from *
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* another source during runtime (such as by downloading it from the *
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* Internet). *
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* *
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* o Links (statically or dynamically) to a library which does any of the *
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* above. *
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* *
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* o Executes a helper program, module, or script to do any of the above. *
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* *
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* This list is not exclusive, but is meant to clarify our interpretation *
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* of derived works with some common examples. Other people may interpret *
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* the plain GPL differently, so we consider this a special exception to *
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* the GPL that we apply to Covered Software. Works which meet any of *
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* these conditions must conform to all of the terms of this license, *
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* particularly including the GPL Section 3 requirements of providing *
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* source code and allowing free redistribution of the work as a whole. *
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* *
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* As another special exception to the GPL terms, Insecure.Com LLC grants *
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* permission to link the code of this program with any version of the *
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* OpenSSL library which is distributed under a license identical to that *
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* listed in the included docs/licenses/OpenSSL.txt file, and distribute *
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* linked combinations including the two. *
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* *
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* Any redistribution of Covered Software, including any derived works, *
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* must obey and carry forward all of the terms of this license, including *
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* obeying all GPL rules and restrictions. For example, source code of *
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* the whole work must be provided and free redistribution must be *
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* allowed. All GPL references to "this License", are to be treated as *
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* including the terms and conditions of this license text as well. *
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* *
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* Because this license imposes special exceptions to the GPL, Covered *
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* Work may not be combined (even as part of a larger work) with plain GPL *
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* software. The terms, conditions, and exceptions of this license must *
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* be included as well. This license is incompatible with some other open *
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* source licenses as well. In some cases we can relicense portions of *
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* Nmap or grant special permissions to use it in other open source *
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* software. Please contact fyodor@nmap.org with any such requests. *
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* Similarly, we don't incorporate incompatible open source software into *
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* Covered Software without special permission from the copyright holders. *
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* *
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* If you have any questions about the licensing restrictions on using *
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* Nmap in other works, are happy to help. As mentioned above, we also *
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* offer alternative license to integrate Nmap into proprietary *
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* applications and appliances. These contracts have been sold to dozens *
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* of software vendors, and generally include a perpetual license as well *
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* as providing for priority support and updates. They also fund the *
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* continued development of Nmap. Please email sales@nmap.com for further *
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* information. *
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* *
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* If you have received a written license agreement or contract for *
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* Covered Software stating terms other than these, you may choose to use *
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* and redistribute Covered Software under those terms instead of these. *
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* *
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* Source is provided to this software because we believe users have a *
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* right to know exactly what a program is going to do before they run it. *
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* This also allows you to audit the software for security holes. *
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* *
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* Source code also allows you to port Nmap to new platforms, fix bugs, *
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* and add new features. You are highly encouraged to send your changes *
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* to the dev@nmap.org mailing list for possible incorporation into the *
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* main distribution. By sending these changes to Fyodor or one of the *
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* Insecure.Org development mailing lists, or checking them into the Nmap *
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* source code repository, it is understood (unless you specify otherwise) *
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* that you are offering the Nmap Project (Insecure.Com LLC) the *
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* unlimited, non-exclusive right to reuse, modify, and relicense the *
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* code. Nmap will always be available Open Source, but this is important *
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* because the inability to relicense code has caused devastating problems *
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* for other Free Software projects (such as KDE and NASM). We also *
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* occasionally relicense the code to third parties as discussed above. *
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* If you wish to specify special license conditions of your *
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* contributions, just say so when you send them. *
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* *
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* This program is distributed in the hope that it will be useful, but *
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* WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the Nmap *
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* license file for more details (it's in a COPYING file included with *
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* Nmap, and also available from https://svn.nmap.org/nmap/COPYING) *
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* *
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***************************************************************************/
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#include "nping.h"
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#include "Crypto.h"
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#include "output.h"
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#include "NpingOps.h"
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#ifdef HAVE_OPENSSL
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#include <openssl/hmac.h>
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#include <openssl/evp.h>
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#include <openssl/err.h>
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#endif
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extern NpingOps o;
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Crypto::Crypto(){
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this->reset();
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} /* End of Crypto constructor */
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Crypto::~Crypto(){
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} /* End of Crypto destructor */
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/** Sets every attribute to its default value. */
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void Crypto::reset() {
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} /* End of reset() */
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int Crypto::hmac_sha256(u8 *inbuff, size_t inlen, u8 *dst_buff, u8 *key, size_t key_len){
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#ifdef HAVE_OPENSSL
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if( o.doCrypto() ){
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u8 result[EVP_MAX_MD_SIZE];
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memset(result, 0, EVP_MAX_MD_SIZE);
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unsigned int result_len;
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HMAC(EVP_sha256(), key, (int)key_len, inbuff, (int)inlen, result, &result_len);
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memcpy(dst_buff, result, 256/8);
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return OP_SUCCESS;
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}
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#endif
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/* Set a bogus sum: all zero */
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memset(dst_buff, 0, HMAC_SHA256_CODE_LEN);
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return OP_SUCCESS;
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} /* End of hmac_sha256() */
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int Crypto::aes128_cbc_encrypt(u8 *inbuff, size_t inlen, u8 *dst_buff, u8 *key, size_t key_len, u8 *iv){
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nping_print(DBG_4, "%s(%p, %lu, %p, %p, %lu, %p)", __func__, inbuff, (unsigned long)inlen, dst_buff, key, (unsigned long)key_len, iv);
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if(inbuff==NULL || dst_buff==NULL || key==NULL || iv==NULL)
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return OP_FAILURE;
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if( ((inlen%AES_BLOCK_SIZE)!=0) || key_len<AES_KEY_SIZE)
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return OP_FAILURE;
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#ifdef HAVE_OPENSSL
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if( o.doCrypto() ){
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int flen=0, flen2=0;
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#if OPENSSL_VERSION_NUMBER < 0x10100000L
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EVP_CIPHER_CTX ctx;
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EVP_CIPHER_CTX_init(&ctx);
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EVP_CIPHER_CTX_set_padding(&ctx, 0);
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int result=OP_SUCCESS;
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if( EVP_EncryptInit(&ctx, EVP_aes_128_cbc(), key, iv)==0 ){
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nping_print(DBG_4, "EVP_EncryptInit() failed");
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result=OP_FAILURE;
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}else if( EVP_EncryptUpdate(&ctx, dst_buff, &flen, inbuff, (int)inlen)==0 ){
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nping_print(DBG_4, "EVP_EncryptUpdate() failed");
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result=OP_FAILURE;
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}else if( EVP_EncryptFinal(&ctx, dst_buff+flen, &flen2)==0 ){
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nping_print(DBG_4, "EVP_EncryptFinal() failed");
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result=OP_FAILURE;
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}
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EVP_CIPHER_CTX_cleanup(&ctx);
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#else
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EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();
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EVP_CIPHER_CTX_reset(ctx);
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EVP_CIPHER_CTX_set_padding(ctx, 0);
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int result=OP_SUCCESS;
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if( EVP_EncryptInit(ctx, EVP_aes_128_cbc(), key, iv)==0 ){
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nping_print(DBG_4, "EVP_EncryptInit() failed");
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result=OP_FAILURE;
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}else if( EVP_EncryptUpdate(ctx, dst_buff, &flen, inbuff, (int)inlen)==0 ){
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nping_print(DBG_4, "EVP_EncryptUpdate() failed");
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result=OP_FAILURE;
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}else if( EVP_EncryptFinal(ctx, dst_buff+flen, &flen2)==0 ){
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nping_print(DBG_4, "EVP_EncryptFinal() failed");
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result=OP_FAILURE;
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}
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EVP_CIPHER_CTX_cleanup(ctx);
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#endif
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return result;
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}
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#endif
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/* Do not encrypt, just set the plaintext */
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for(size_t i=0; i<inlen; i++)
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dst_buff[i]=inbuff[i];
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return OP_SUCCESS;
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} /* End of aes128_cbc_encrypt() */
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int Crypto::aes128_cbc_decrypt(u8 *inbuff, size_t inlen, u8 *dst_buff, u8 *key, size_t key_len, u8 *iv){
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nping_print(DBG_4, "%s(%p, %lu, %p, %p, %lu, %p)", __func__, inbuff, (unsigned long)inlen, dst_buff, key, (unsigned long)key_len, iv);
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if(inbuff==NULL || dst_buff==NULL || key==NULL || iv==NULL)
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return OP_FAILURE;
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if( ((inlen%AES_BLOCK_SIZE)!=0) || key_len<AES_KEY_SIZE)
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return OP_FAILURE;
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#ifdef HAVE_OPENSSL
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if( o.doCrypto() ){
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int flen1=0, flen2=0;
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#if OPENSSL_VERSION_NUMBER < 0x10100000L
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EVP_CIPHER_CTX ctx;
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EVP_CIPHER_CTX_init(&ctx);
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EVP_CIPHER_CTX_set_padding(&ctx, 0);
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int result=OP_SUCCESS;
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if( EVP_DecryptInit(&ctx, EVP_aes_128_cbc(), key, iv)==0 ){
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nping_print(DBG_4, "EVP_DecryptInit() failed");
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result=OP_FAILURE;
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}else if( EVP_DecryptUpdate(&ctx, dst_buff, &flen1, inbuff, (int)inlen)==0 ){
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nping_print(DBG_4, "EVP_DecryptUpdate() failed");
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result=OP_FAILURE;
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}else if( EVP_DecryptFinal(&ctx, dst_buff+flen1, &flen2)==0 ){
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nping_print(DBG_4, "OpenSSL bug: it says EVP_DecryptFinal() failed when it didn't (%s).",
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ERR_error_string(ERR_peek_last_error(), NULL));
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#else
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EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();
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EVP_CIPHER_CTX_reset(ctx);
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EVP_CIPHER_CTX_set_padding(ctx, 0);
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int result=OP_SUCCESS;
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if( EVP_DecryptInit(ctx, EVP_aes_128_cbc(), key, iv)==0 ){
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nping_print(DBG_4, "EVP_DecryptInit() failed");
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result=OP_FAILURE;
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}else if( EVP_DecryptUpdate(ctx, dst_buff, &flen1, inbuff, (int)inlen)==0 ){
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nping_print(DBG_4, "EVP_DecryptUpdate() failed");
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result=OP_FAILURE;
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}else if( EVP_DecryptFinal(ctx, dst_buff+flen1, &flen2)==0 ){
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nping_print(DBG_4, "OpenSSL bug: it says EVP_DecryptFinal() failed when it didn't (%s).",
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ERR_error_string(ERR_peek_last_error(), NULL));
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#endif
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/* We do not return OP_FAILURE in this case because the
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* EVP_DecryptFinal() function seems to be buggy and fails when it shouldn't.
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* We are passing a buffer whose length is multiple of the AES block
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* size, we've disable padding, and still, the call fails.
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* The call to EVP_DecryptUpdate() says we've decrypted all blocks but
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* the last one and then EVP_DecryptFinal says we have decrypted nothing.
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* However I've tested this for hours and everything works fine. The
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* full buffer is decrypted correctly, from the first to the last byte,
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* so we return OP_SUCCESS even if OpenSSL says the opposite. */
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/* NOTE for developers debugging memory issues with Valgrind:
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* None of these seems to free OpenSSL's internal error structures.
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* Valgrind currently reports things like:
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==12849== 592 bytes in 1 blocks are still reachable in loss record 7 of 9
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==12849== at 0x4C284A8: malloc (vg_replace_malloc.c:236)
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==12849== by 0x531BF21: CRYPTO_malloc (in /lib/libcrypto.so.0.9.8)
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==12849== by 0x537F25D: ERR_get_state (in /lib/libcrypto.so.0.9.8)
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==12849== by 0x537E7BE: ERR_put_error (in /lib/libcrypto.so.0.9.8)
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==12849== by 0x5381EB0: EVP_DecryptFinal_ex (in /lib/libcrypto.so.0.9.8)
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==12849== by 0x429A49: Crypto::aes128_cbc_decrypt(unsigned char*...
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==12849== by 0x41ABBA: EchoHeader::decrypt(unsigned char*, unsign...
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*/
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//ERR_clear_error();
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//ERR_free_strings();
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//ERR_pop_to_mark();
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}
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#if OPENSSL_VERSION_NUMBER < 0x10100000L
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EVP_CIPHER_CTX_cleanup(&ctx);
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#else
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EVP_CIPHER_CTX_reset(ctx);
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#endif
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return result;
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}
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#endif
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/* Do not decrypt, just leave the ciphertext */
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for(size_t i=0; i<inlen; i++)
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dst_buff[i]=inbuff[i];
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return OP_SUCCESS;
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} /* End of aes128_cbc_decrypt() */
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int Crypto::generateNonce(u8 *dst_buff, size_t bufflen){
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nping_print(DBG_4, "%s()", __func__);
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if(dst_buff==NULL || bufflen<=0)
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return OP_FAILURE;
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#ifdef HAVE_OPENSSL
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// Get cryptographically secure random data from OpenSSL
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// @todo TODO finish this.
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get_random_bytes(dst_buff, bufflen); /* Provided by nbase */
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#else
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get_random_bytes(dst_buff, bufflen); /* Provided by nbase */
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#endif
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return OP_SUCCESS;
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} /* End of generateNonce() */
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#define TIMES_KEY_DERIVATION 1000
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u8 *Crypto::deriveKey(const u8 *from, size_t fromlen, size_t *final_len){
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nping_print(DBG_4, "%s()", __func__);
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if(from==NULL || fromlen==0)
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return NULL;
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#ifdef HAVE_OPENSSL
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if( o.doCrypto() ){
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static u8 hash[MAX(SHA256_HASH_LEN, EVP_MAX_MD_SIZE)];
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static u8 next[MAX(SHA256_HASH_LEN, EVP_MAX_MD_SIZE)];
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unsigned int lastlen;
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#if OPENSSL_VERSION_NUMBER < 0x10100000L
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EVP_MD_CTX ctx;
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EVP_MD_CTX_init(&ctx);
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if( EVP_MD_size(EVP_sha256()) != SHA256_HASH_LEN )
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nping_fatal(QT_2, "OpenSSL is broken. SHA256 len is %d\n", EVP_MD_size(EVP_sha256()) );
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/* Compute the SHA256 hash of the supplied buffer */
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EVP_DigestInit(&ctx, EVP_sha256());
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EVP_DigestUpdate(&ctx, from, fromlen);
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EVP_DigestFinal(&ctx, hash, &lastlen);
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/* Now compute the 1000th hash of that hash */
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for(int i=0; i<TIMES_KEY_DERIVATION; i++){
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EVP_MD_CTX_init(&ctx);
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EVP_DigestInit(&ctx, EVP_sha256());
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EVP_DigestUpdate(&ctx, hash, SHA256_HASH_LEN);
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EVP_DigestFinal(&ctx, next, &lastlen);
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memcpy(hash, next, SHA256_HASH_LEN);
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}
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if(final_len!=NULL)
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*final_len=SHA256_HASH_LEN;
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EVP_MD_CTX_cleanup(&ctx);
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#else
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EVP_MD_CTX *ctx = EVP_MD_CTX_new();
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EVP_MD_CTX_init(ctx);
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if( EVP_MD_size(EVP_sha256()) != SHA256_HASH_LEN )
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nping_fatal(QT_2, "OpenSSL is broken. SHA256 len is %d\n", EVP_MD_size(EVP_sha256()) );
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/* Compute the SHA256 hash of the supplied buffer */
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EVP_DigestInit(ctx, EVP_sha256());
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EVP_DigestUpdate(ctx, from, fromlen);
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EVP_DigestFinal(ctx, hash, &lastlen);
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/* Now compute the 1000th hash of that hash */
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for(int i=0; i<TIMES_KEY_DERIVATION; i++){
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EVP_MD_CTX_init(ctx);
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EVP_DigestInit(ctx, EVP_sha256());
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EVP_DigestUpdate(ctx, hash, SHA256_HASH_LEN);
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EVP_DigestFinal(ctx, next, &lastlen);
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memcpy(hash, next, SHA256_HASH_LEN);
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}
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if(final_len!=NULL)
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*final_len=SHA256_HASH_LEN;
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EVP_MD_CTX_free(ctx);
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#endif
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return hash;
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}
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#endif
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static u8 zerohash[SHA256_HASH_LEN];
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memset(zerohash, 0, SHA256_HASH_LEN);
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if(final_len!=NULL)
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*final_len=SHA256_HASH_LEN;
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return zerohash;
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} /* End of deriveKey() */
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