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Diffstat (limited to 'modules/core/enc_sha256.cpp')
| -rw-r--r-- | modules/core/enc_sha256.cpp | 314 |
1 files changed, 0 insertions, 314 deletions
diff --git a/modules/core/enc_sha256.cpp b/modules/core/enc_sha256.cpp deleted file mode 100644 index 3034f3731..000000000 --- a/modules/core/enc_sha256.cpp +++ /dev/null @@ -1,314 +0,0 @@ -/* This module generates and compares password hashes using SHA256 algorithms. - * To help reduce the risk of dictionary attacks, the code appends random bytes - * (so-called "salt") to the original plain text before generating hashes and - * stores this salt appended to the result. To verify another plain text value - * against the given hash, this module will retrieve the salt value from the - * password string and use it when computing a new hash of the plain text. - * - * If an intruder gets access to your system or uses a brute force attack, - * salt will not provide much value. - * IMPORTANT: DATA HASHES CANNOT BE "DECRYPTED" BACK TO PLAIN TEXT. - * - * Modified for Anope. - * (C) 2003-2011 Anope Team - * Contact us at team@anope.org - * - * Taken from InspIRCd ( www.inspircd.org ) - * see http://wiki.inspircd.org/Credits - * - * This program is free but copyrighted software; see - * the file COPYING for details. - */ - -/* FIPS 180-2 SHA-224/256/384/512 implementation - * Last update: 05/23/2005 - * Issue date: 04/30/2005 - * - * Copyright (C) 2005 Olivier Gay <olivier.gay@a3.epfl.ch> - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. Neither the name of the project nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - */ - -#include "module.h" - -static const unsigned SHA256_DIGEST_SIZE = 256 / 8; -static const unsigned SHA256_BLOCK_SIZE = 512 / 8; - -/** An sha256 context - */ -class SHA256Context -{ - public: - unsigned tot_len; - unsigned len; - unsigned char block[2 * SHA256_BLOCK_SIZE]; - uint32 h[8]; -}; - -inline static uint32 SHFR(uint32 x, uint32 n) { return x >> n; } -inline static uint32 ROTR(uint32 x, uint32 n) { return (x >> n) | (x << ((sizeof(x) << 3) - n)); } -inline static uint32 ROTL(uint32 x, uint32 n) { return (x << n) | (x >> ((sizeof(x) << 3) - n)); } -inline static uint32 CH(uint32 x, uint32 y, uint32 z) { return (x & y) ^ (~x & z); } -inline static uint32 MAJ(uint32 x, uint32 y, uint32 z) { return (x & y) ^ (x & z) ^ (y & z); } - -inline static uint32 SHA256_F1(uint32 x) { return ROTR(x, 2) ^ ROTR(x, 13) ^ ROTR(x, 22); } -inline static uint32 SHA256_F2(uint32 x) { return ROTR(x, 6) ^ ROTR(x, 11) ^ ROTR(x, 25); } -inline static uint32 SHA256_F3(uint32 x) { return ROTR(x, 7) ^ ROTR(x, 18) ^ SHFR(x, 3); } -inline static uint32 SHA256_F4(uint32 x) { return ROTR(x, 17) ^ ROTR(x, 19) ^ SHFR(x, 10); } - -inline static void UNPACK32(unsigned x, unsigned char *str) -{ - str[3] = static_cast<uint8>(x); - str[2] = static_cast<uint8>(x >> 8); - str[1] = static_cast<uint8>(x >> 16); - str[0] = static_cast<uint8>(x >> 24); -} - -inline static void PACK32(unsigned char *str, uint32 &x) -{ - x = static_cast<uint32>(str[3]) | static_cast<uint32>(str[2]) << 8 | static_cast<uint32>(str[1]) << 16 | static_cast<uint32>(str[0]) << 24; -} - -/* Macros used for loops unrolling */ - -inline static void SHA256_SCR(uint32 w[64], int i) -{ - w[i] = SHA256_F4(w[i - 2]) + w[i - 7] + SHA256_F3(w[i - 15]) + w[i - 16]; -} - -uint32 sha256_k[64] = -{ - 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, - 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, - 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, - 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, - 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, - 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, - 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, - 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, - 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, - 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, - 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, - 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, - 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, - 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, - 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, - 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2 -}; - -class ESHA256 : public Module -{ - unsigned iv[8]; - bool use_iv; - - /* initializes the IV with a new random value */ - void NewRandomIV() - { - for (int i = 0; i < 8; ++i) - iv[i] = getrandom32(); - } - - /* returns the IV as base64-encrypted string */ - Anope::string GetIVString() - { - char buf[33]; - for (int i = 0; i < 8; ++i) - UNPACK32(iv[i], reinterpret_cast<unsigned char *>(&buf[i << 2])); - buf[32] = '\0'; - return Anope::Hex(buf, 32); - } - - /* splits the appended IV from the password string so it can be used for the next encryption */ - /* password format: <hashmethod>:<password_b64>:<iv_b64> */ - void GetIVFromPass(const Anope::string &password) - { - size_t pos = password.find(':'); - Anope::string buf = password.substr(password.find(':', pos + 1) + 1, password.length()); - char buf2[33]; - Anope::Unhex(buf, buf2); - for (int i = 0 ; i < 8; ++i) - PACK32(reinterpret_cast<unsigned char *>(&buf2[i << 2]), iv[i]); - } - - void SHA256Init(SHA256Context *ctx) - { - for (int i = 0; i < 8; ++i) - ctx->h[i] = iv[i]; - ctx->len = 0; - ctx->tot_len = 0; - } - - void SHA256Transform(SHA256Context *ctx, unsigned char *message, unsigned block_nb) - { - uint32 w[64], wv[8]; - unsigned char *sub_block; - for (unsigned i = 1; i <= block_nb; ++i) - { - int j; - sub_block = message + ((i - 1) << 6); - - for (j = 0; j < 16; ++j) - PACK32(&sub_block[j << 2], w[j]); - for (j = 16; j < 64; ++j) - SHA256_SCR(w, j); - for (j = 0; j < 8; ++j) - wv[j] = ctx->h[j]; - for (j = 0; j < 64; ++j) - { - uint32 t1 = wv[7] + SHA256_F2(wv[4]) + CH(wv[4], wv[5], wv[6]) + sha256_k[j] + w[j]; - uint32 t2 = SHA256_F1(wv[0]) + MAJ(wv[0], wv[1], wv[2]); - wv[7] = wv[6]; - wv[6] = wv[5]; - wv[5] = wv[4]; - wv[4] = wv[3] + t1; - wv[3] = wv[2]; - wv[2] = wv[1]; - wv[1] = wv[0]; - wv[0] = t1 + t2; - } - for (j = 0; j < 8; ++j) - ctx->h[j] += wv[j]; - } - } - - void SHA256Update(SHA256Context *ctx, const unsigned char *message, unsigned len) - { - /* - * XXX here be dragons! - * After many hours of pouring over this, I think I've found the problem. - * When Special created our module from the reference one, he used: - * - * unsigned rem_len = SHA256_BLOCK_SIZE - ctx->len; - * - * instead of the reference's version of: - * - * unsigned tmp_len = SHA256_BLOCK_SIZE - ctx->len; - * unsigned rem_len = len < tmp_len ? len : tmp_len; - * - * I've changed back to the reference version of this code, and it seems to work with no errors. - * So I'm inclined to believe this was the problem.. - * -- w00t (January 06, 2008) - */ - unsigned tmp_len = SHA256_BLOCK_SIZE - ctx->len, rem_len = len < tmp_len ? len : tmp_len; - - memcpy(&ctx->block[ctx->len], message, rem_len); - if (ctx->len + len < SHA256_BLOCK_SIZE) - { - ctx->len += len; - return; - } - unsigned new_len = len - rem_len, block_nb = new_len / SHA256_BLOCK_SIZE; - unsigned char *shifted_message = new unsigned char[len - rem_len]; - memcpy(shifted_message, message + rem_len, len - rem_len); - SHA256Transform(ctx, ctx->block, 1); - SHA256Transform(ctx, shifted_message, block_nb); - rem_len = new_len % SHA256_BLOCK_SIZE; - memcpy(ctx->block, &shifted_message[block_nb << 6], rem_len); - delete [] shifted_message; - ctx->len = rem_len; - ctx->tot_len += (block_nb + 1) << 6; - } - - void SHA256Final(SHA256Context *ctx, unsigned char *digest) - { - unsigned block_nb = 1 + ((SHA256_BLOCK_SIZE - 9) < (ctx->len % SHA256_BLOCK_SIZE)); - unsigned len_b = (ctx->tot_len + ctx->len) << 3; - unsigned pm_len = block_nb << 6; - memset(ctx->block + ctx->len, 0, pm_len - ctx->len); - ctx->block[ctx->len] = 0x80; - UNPACK32(len_b, ctx->block + pm_len - 4); - SHA256Transform(ctx, ctx->block, block_nb); - for (int i = 0 ; i < 8; ++i) - UNPACK32(ctx->h[i], &digest[i << 2]); - } - -/********** ANOPE ******/ - public: - ESHA256(const Anope::string &modname, const Anope::string &creator) : Module(modname, creator, ENCRYPTION) - { - this->SetAuthor("Anope"); - - Implementation i[] = { I_OnEncrypt, I_OnCheckAuthentication }; - ModuleManager::Attach(i, this, sizeof(i) / sizeof(Implementation)); - - use_iv = false; - } - - EventReturn OnEncrypt(const Anope::string &src, Anope::string &dest) - { - char digest[SHA256_DIGEST_SIZE + 1]; - SHA256Context ctx; - std::stringstream buf; - - if (!use_iv) - NewRandomIV(); - else - use_iv = false; - - SHA256Init(&ctx); - SHA256Update(&ctx, reinterpret_cast<const unsigned char *>(src.c_str()), src.length()); - SHA256Final(&ctx, reinterpret_cast<unsigned char *>(digest)); - digest[SHA256_DIGEST_SIZE] = '\0'; - buf << "sha256:" << Anope::Hex(digest, SHA256_DIGEST_SIZE) << ":" << GetIVString(); - Log(LOG_DEBUG_2) << "(enc_sha256) hashed password from [" << src << "] to [" << buf.str() << " ]"; - dest = buf.str(); - return EVENT_ALLOW; - } - - EventReturn OnCheckAuthentication(Command *c, CommandSource *source, const std::vector<Anope::string> ¶ms, const Anope::string &account, const Anope::string &password) - { - NickAlias *na = findnick(account); - NickCore *nc = na ? na->nc : NULL; - if (na == NULL) - return EVENT_CONTINUE; - - size_t pos = nc->pass.find(':'); - if (pos == Anope::string::npos) - return EVENT_CONTINUE; - Anope::string hash_method(nc->pass.begin(), nc->pass.begin() + pos); - if (!hash_method.equals_cs("sha256")) - return EVENT_CONTINUE; - - GetIVFromPass(nc->pass); - use_iv = true; - Anope::string buf; - this->OnEncrypt(password, buf); - - if (nc->pass.equals_cs(buf)) - { - /* if we are NOT the first module in the list, - * we want to re-encrypt the pass with the new encryption - */ - if (ModuleManager::FindFirstOf(ENCRYPTION) != this) - enc_encrypt(password, nc->pass); - return EVENT_ALLOW; - } - - return EVENT_CONTINUE; - } -}; - -MODULE_INIT(ESHA256) |