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v7.991
nping/Crypto.cc
265 строк
10 KB
dmiller
Check return from OpenSSL allocation functions. Fixes #2721
19 июн 2026, 02:26
19 июн 2026, 02:26
b3620f7
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/*************************************************************************** * Crypto.cc -- The Crypto Class contains miscellaneous 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) 1996-2026 Nmap Software LLC ("The Nmap * Project"). Nmap is also a registered trademark of the Nmap Project. * * This program is distributed under the terms of the Nmap Public Source * License (NPSL). The exact license text applying to a particular Nmap * release or source code control revision is contained in the LICENSE * file distributed with that version of Nmap or source code control * revision. More Nmap copyright/legal information is available from * https://nmap.org/book/man-legal.html, and further information on the * NPSL license itself can be found at https://nmap.org/npsl/ . This * header summarizes some key points from the Nmap license, but is no * substitute for the actual license text. * * Nmap is generally free for end users to download and use themselves, * including commercial use. It is available from https://nmap.org. * * The Nmap license generally prohibits companies from using and * redistributing Nmap in commercial products, but we sell a special Nmap * OEM Edition with a more permissive license and special features for * this purpose. See https://nmap.org/oem/ * * If you have received a written Nmap license agreement or contract * stating terms other than these (such as an Nmap OEM license), you may * choose to use and redistribute Nmap under those terms instead. * * The official Nmap Windows builds include the Npcap software * (https://npcap.com) for packet capture and transmission. It is under * separate license terms which forbid redistribution without special * permission. So the official Nmap Windows builds may not be redistributed * without special permission (such as an Nmap OEM license). * * 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. * * Source code also allows you to port Nmap to new platforms, fix bugs, and * add new features. You are highly encouraged to submit your changes as a * Github PR or by email to the dev@nmap.org mailing list for possible * incorporation into the main distribution. Unless you specify otherwise, it * is understood that you are offering us very broad rights to use your * submissions as described in the Nmap Public Source License Contributor * Agreement. This is important because we fund the project by selling licenses * with various terms, and also because the inability to relicense code has * caused devastating problems for other Free Software projects (such as KDE * and NASM). * * The free version of Nmap 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. Warranties, * indemnification and commercial support are all available through the * Npcap OEM program--see https://nmap.org/oem/ * ***************************************************************************/ #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> #if ((OPENSSL_VERSION_NUMBER >= 0x10100000L) && !defined LIBRESSL_VERSION_NUMBER) || \ (defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER >= 0x20000000L) #define HAVE_OPAQUE_EVP_PKEY 1 #else #define EVP_MD_CTX_new EVP_MD_CTX_create #define EVP_MD_CTX_free EVP_MD_CTX_destroy #define EVP_CIPHER_CTX_free EVP_CIPHER_CTX_cleanup #endif #endif /* HAVE_OPENSSL */ 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){ nping_print(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; #if HAVE_OPAQUE_EVP_PKEY EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new(); if (ctx == NULL) { nping_print(DBG_4, "Failed to allocate cipher context"); return OP_FAILURE; } #else EVP_CIPHER_CTX stack_ctx; EVP_CIPHER_CTX *ctx = &stack_ctx; EVP_CIPHER_CTX_init(ctx); #endif int result=OP_SUCCESS; if( EVP_EncryptInit(ctx, EVP_aes_128_cbc(), key, iv)==0 ){ nping_print(DBG_4, "EVP_EncryptInit() failed"); result=OP_FAILURE; }else if( EVP_CIPHER_CTX_set_padding(ctx, 0) && EVP_EncryptUpdate(ctx, dst_buff, &flen, inbuff, (int)inlen)==0 ){ nping_print(DBG_4, "EVP_EncryptUpdate() failed"); result=OP_FAILURE; }else if( EVP_EncryptFinal(ctx, dst_buff+flen, &flen2)==0 ){ nping_print(DBG_4, "EVP_EncryptFinal() failed"); result=OP_FAILURE; } EVP_CIPHER_CTX_free(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){ nping_print(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; #if HAVE_OPAQUE_EVP_PKEY EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new(); if (ctx == NULL) { nping_print(DBG_4, "Failed to allocate cipher context"); return OP_FAILURE; } #else EVP_CIPHER_CTX stack_ctx; EVP_CIPHER_CTX *ctx = &stack_ctx; EVP_CIPHER_CTX_init(ctx); #endif int result=OP_SUCCESS; if( EVP_DecryptInit(ctx, EVP_aes_128_cbc(), key, iv)==0 ){ nping_print(DBG_4, "EVP_DecryptInit() failed"); result=OP_FAILURE; }else if( EVP_DecryptUpdate(ctx, dst_buff, &flen1, inbuff, (int)inlen)==0 ){ nping_print(DBG_4, "EVP_DecryptUpdate() failed"); result=OP_FAILURE; }else if( EVP_CIPHER_CTX_set_padding(ctx, 0) && EVP_DecryptFinal(ctx, dst_buff+flen1, &flen2)==0 ){ nping_print(DBG_4, "EVP_DecryptFinal() failed"); result=OP_FAILURE; } EVP_CIPHER_CTX_free(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){ nping_print(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){ nping_print(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_new(); if (ctx == NULL) { nping_print(DBG_4, "Failed to allocate MD context"); return NULL; } if( EVP_MD_size(EVP_sha256()) != SHA256_HASH_LEN ) nping_fatal(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_free(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() */