mirror of git://git.acid.vegas/anope.git
335 lines
10 KiB
C++
335 lines
10 KiB
C++
/* This module generates and compares password hashes using SHA256 algorithms.
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*
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* If an intruder gets access to your system or uses a brute force attack,
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* salt will not provide much value.
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* IMPORTANT: DATA HASHES CANNOT BE "DECRYPTED" BACK TO PLAIN TEXT.
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*
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* Modified for Anope.
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* (C) 2003-2022 Anope Team
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* Contact us at team@anope.org
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*
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* Taken from InspIRCd (https://www.inspircd.org/),
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* see https://wiki.inspircd.org/Credits
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*
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* This program is free but copyrighted software; see
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* the file COPYING for details.
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*/
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/* FIPS 180-2 SHA-224/256/384/512 implementation
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* Last update: 05/23/2005
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* Issue date: 04/30/2005
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*
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* Copyright (C) 2005 Olivier Gay <olivier.gay@a3.epfl.ch>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "module.h"
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#include "modules/encryption.h"
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static const unsigned SHA256_DIGEST_SIZE = 256 / 8;
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static const unsigned SHA256_BLOCK_SIZE = 512 / 8;
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inline static uint32_t SHFR(uint32_t x, uint32_t n) { return x >> n; }
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inline static uint32_t ROTR(uint32_t x, uint32_t n) { return (x >> n) | (x << ((sizeof(x) << 3) - n)); }
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inline static uint32_t CH(uint32_t x, uint32_t y, uint32_t z) { return (x & y) ^ (~x & z); }
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inline static uint32_t MAJ(uint32_t x, uint32_t y, uint32_t z) { return (x & y) ^ (x & z) ^ (y & z); }
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inline static uint32_t SHA256_F1(uint32_t x) { return ROTR(x, 2) ^ ROTR(x, 13) ^ ROTR(x, 22); }
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inline static uint32_t SHA256_F2(uint32_t x) { return ROTR(x, 6) ^ ROTR(x, 11) ^ ROTR(x, 25); }
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inline static uint32_t SHA256_F3(uint32_t x) { return ROTR(x, 7) ^ ROTR(x, 18) ^ SHFR(x, 3); }
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inline static uint32_t SHA256_F4(uint32_t x) { return ROTR(x, 17) ^ ROTR(x, 19) ^ SHFR(x, 10); }
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inline static void UNPACK32(unsigned x, unsigned char *str)
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{
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str[3] = static_cast<uint8_t>(x);
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str[2] = static_cast<uint8_t>(x >> 8);
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str[1] = static_cast<uint8_t>(x >> 16);
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str[0] = static_cast<uint8_t>(x >> 24);
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}
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inline static void PACK32(unsigned char *str, uint32_t &x)
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{
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x = static_cast<uint32_t>(str[3]) | static_cast<uint32_t>(str[2]) << 8 | static_cast<uint32_t>(str[1]) << 16 | static_cast<uint32_t>(str[0]) << 24;
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}
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/* Macros used for loops unrolling */
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inline static void SHA256_SCR(uint32_t w[64], int i)
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{
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w[i] = SHA256_F4(w[i - 2]) + w[i - 7] + SHA256_F3(w[i - 15]) + w[i - 16];
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}
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static const uint32_t sha256_h0[8] =
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{
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0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
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0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19
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};
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static const uint32_t sha256_k[64] =
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{
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0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
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0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
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0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
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0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
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0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
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0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
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0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
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0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
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0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
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0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
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0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
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0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
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0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
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0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
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0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
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0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
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};
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/** An sha256 context
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*/
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class SHA256Context : public Encryption::Context
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{
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void Transform(unsigned char *message, unsigned block_nb)
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{
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uint32_t w[64], wv[8];
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unsigned char *sub_block;
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for (unsigned i = 1; i <= block_nb; ++i)
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{
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int j;
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sub_block = message + ((i - 1) << 6);
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for (j = 0; j < 16; ++j)
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PACK32(&sub_block[j << 2], w[j]);
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for (j = 16; j < 64; ++j)
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SHA256_SCR(w, j);
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for (j = 0; j < 8; ++j)
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wv[j] = this->h[j];
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for (j = 0; j < 64; ++j)
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{
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uint32_t t1 = wv[7] + SHA256_F2(wv[4]) + CH(wv[4], wv[5], wv[6]) + sha256_k[j] + w[j];
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uint32_t t2 = SHA256_F1(wv[0]) + MAJ(wv[0], wv[1], wv[2]);
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wv[7] = wv[6];
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wv[6] = wv[5];
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wv[5] = wv[4];
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wv[4] = wv[3] + t1;
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wv[3] = wv[2];
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wv[2] = wv[1];
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wv[1] = wv[0];
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wv[0] = t1 + t2;
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}
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for (j = 0; j < 8; ++j)
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this->h[j] += wv[j];
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}
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}
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unsigned tot_len;
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unsigned len;
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unsigned char block[2 * SHA256_BLOCK_SIZE];
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uint32_t h[8];
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unsigned char digest[SHA256_DIGEST_SIZE];
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public:
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SHA256Context(Encryption::IV *iv)
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{
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if (iv != NULL)
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{
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if (iv->second != 8)
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throw CoreException("Invalid IV size");
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for (int i = 0; i < 8; ++i)
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this->h[i] = iv->first[i];
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}
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else
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for (int i = 0; i < 8; ++i)
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this->h[i] = sha256_h0[i];
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this->tot_len = 0;
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this->len = 0;
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memset(this->block, 0, sizeof(this->block));
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memset(this->digest, 0, sizeof(this->digest));
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}
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void Update(const unsigned char *message, size_t mlen) anope_override
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{
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unsigned tmp_len = SHA256_BLOCK_SIZE - this->len, rem_len = mlen < tmp_len ? mlen : tmp_len;
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memcpy(&this->block[this->len], message, rem_len);
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if (this->len + mlen < SHA256_BLOCK_SIZE)
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{
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this->len += mlen;
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return;
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}
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unsigned new_len = mlen - rem_len, block_nb = new_len / SHA256_BLOCK_SIZE;
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unsigned char *shifted_message = new unsigned char[mlen - rem_len];
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memcpy(shifted_message, message + rem_len, mlen - rem_len);
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this->Transform(this->block, 1);
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this->Transform(shifted_message, block_nb);
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rem_len = new_len % SHA256_BLOCK_SIZE;
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memcpy(this->block, &shifted_message[block_nb << 6], rem_len);
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delete [] shifted_message;
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this->len = rem_len;
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this->tot_len += (block_nb + 1) << 6;
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}
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void Finalize() anope_override
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{
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unsigned block_nb = 1 + ((SHA256_BLOCK_SIZE - 9) < (this->len % SHA256_BLOCK_SIZE));
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unsigned len_b = (this->tot_len + this->len) << 3;
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unsigned pm_len = block_nb << 6;
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memset(this->block + this->len, 0, pm_len - this->len);
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this->block[this->len] = 0x80;
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UNPACK32(len_b, this->block + pm_len - 4);
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this->Transform(this->block, block_nb);
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for (int i = 0 ; i < 8; ++i)
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UNPACK32(this->h[i], &this->digest[i << 2]);
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}
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Encryption::Hash GetFinalizedHash() anope_override
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{
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Encryption::Hash hash;
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hash.first = this->digest;
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hash.second = SHA256_DIGEST_SIZE;
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return hash;
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}
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};
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class SHA256Provider : public Encryption::Provider
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{
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public:
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SHA256Provider(Module *creator) : Encryption::Provider(creator, "sha256") { }
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Encryption::Context *CreateContext(Encryption::IV *iv) anope_override
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{
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return new SHA256Context(iv);
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}
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Encryption::IV GetDefaultIV() anope_override
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{
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Encryption::IV iv;
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iv.first = sha256_h0;
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iv.second = sizeof(sha256_h0) / sizeof(uint32_t);
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return iv;
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}
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};
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class ESHA256 : public Module
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{
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SHA256Provider sha256provider;
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unsigned iv[8];
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bool use_iv;
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/* initializes the IV with a new random value */
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void NewRandomIV()
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{
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for (int i = 0; i < 8; ++i)
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iv[i] = static_cast<uint32_t>(rand());
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}
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/* returns the IV as base64-encrypted string */
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Anope::string GetIVString()
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{
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char buf[33];
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for (int i = 0; i < 8; ++i)
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UNPACK32(iv[i], reinterpret_cast<unsigned char *>(&buf[i << 2]));
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buf[32] = '\0';
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return Anope::Hex(buf, 32);
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}
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/* splits the appended IV from the password string so it can be used for the next encryption */
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/* password format: <hashmethod>:<password_b64>:<iv_b64> */
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void GetIVFromPass(const Anope::string &password)
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{
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size_t pos = password.find(':');
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Anope::string buf = password.substr(password.find(':', pos + 1) + 1, password.length());
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char buf2[33];
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Anope::Unhex(buf, buf2, sizeof(buf2));
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for (int i = 0 ; i < 8; ++i)
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PACK32(reinterpret_cast<unsigned char *>(&buf2[i << 2]), iv[i]);
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}
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public:
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ESHA256(const Anope::string &modname, const Anope::string &creator) : Module(modname, creator, ENCRYPTION | VENDOR),
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sha256provider(this)
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{
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use_iv = false;
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}
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EventReturn OnEncrypt(const Anope::string &src, Anope::string &dest) anope_override
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{
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if (!use_iv)
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NewRandomIV();
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else
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use_iv = false;
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Encryption::IV initialization(this->iv, 8);
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SHA256Context ctx(&initialization);
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ctx.Update(reinterpret_cast<const unsigned char *>(src.c_str()), src.length());
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ctx.Finalize();
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Encryption::Hash hash = ctx.GetFinalizedHash();
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std::stringstream buf;
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buf << "sha256:" << Anope::Hex(reinterpret_cast<const char *>(hash.first), hash.second) << ":" << GetIVString();
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Log(LOG_DEBUG_2) << "(enc_sha256) hashed password from [" << src << "] to [" << buf.str() << " ]";
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dest = buf.str();
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return EVENT_ALLOW;
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}
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void OnCheckAuthentication(User *, IdentifyRequest *req) anope_override
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{
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const NickAlias *na = NickAlias::Find(req->GetAccount());
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if (na == NULL)
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return;
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NickCore *nc = na->nc;
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size_t pos = nc->pass.find(':');
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if (pos == Anope::string::npos)
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return;
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Anope::string hash_method(nc->pass.begin(), nc->pass.begin() + pos);
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if (!hash_method.equals_cs("sha256"))
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return;
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GetIVFromPass(nc->pass);
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use_iv = true;
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Anope::string buf;
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this->OnEncrypt(req->GetPassword(), buf);
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if (nc->pass.equals_cs(buf))
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{
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/* if we are NOT the first module in the list,
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* we want to re-encrypt the pass with the new encryption
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*/
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if (ModuleManager::FindFirstOf(ENCRYPTION) != this)
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Anope::Encrypt(req->GetPassword(), nc->pass);
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req->Success(this);
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}
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}
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};
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MODULE_INIT(ESHA256)
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