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Diffstat (limited to 'modules/encryption/sha256.cpp')
| -rw-r--r-- | modules/encryption/sha256.cpp | 344 |
1 files changed, 344 insertions, 0 deletions
diff --git a/modules/encryption/sha256.cpp b/modules/encryption/sha256.cpp new file mode 100644 index 000000000..457cab9ec --- /dev/null +++ b/modules/encryption/sha256.cpp @@ -0,0 +1,344 @@ +/* + * Anope IRC Services + * + * Copyright (C) 2010-2017 Anope Team <team@anope.org> + * + * This file is part of Anope. Anope is free software; you can + * redistribute it and/or modify it under the terms of the GNU + * General Public License as published by the Free Software + * Foundation, version 2. + * + * 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 for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see see <http://www.gnu.org/licenses/>. + */ + +/* 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" +#include "modules/encryption.h" + +static const unsigned SHA256_DIGEST_SIZE = 256 / 8; +static const unsigned SHA256_BLOCK_SIZE = 512 / 8; + +inline static uint32_t SHFR(uint32_t x, uint32_t n) { return x >> n; } +inline static uint32_t ROTR(uint32_t x, uint32_t n) { return (x >> n) | (x << ((sizeof(x) << 3) - n)); } +inline static uint32_t CH(uint32_t x, uint32_t y, uint32_t z) { return (x & y) ^ (~x & z); } +inline static uint32_t MAJ(uint32_t x, uint32_t y, uint32_t z) { return (x & y) ^ (x & z) ^ (y & z); } + +inline static uint32_t SHA256_F1(uint32_t x) { return ROTR(x, 2) ^ ROTR(x, 13) ^ ROTR(x, 22); } +inline static uint32_t SHA256_F2(uint32_t x) { return ROTR(x, 6) ^ ROTR(x, 11) ^ ROTR(x, 25); } +inline static uint32_t SHA256_F3(uint32_t x) { return ROTR(x, 7) ^ ROTR(x, 18) ^ SHFR(x, 3); } +inline static uint32_t SHA256_F4(uint32_t 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_t>(x); + str[2] = static_cast<uint8_t>(x >> 8); + str[1] = static_cast<uint8_t>(x >> 16); + str[0] = static_cast<uint8_t>(x >> 24); +} + +inline static void PACK32(unsigned char *str, uint32_t &x) +{ + 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; +} + +/* Macros used for loops unrolling */ + +inline static void SHA256_SCR(uint32_t w[64], int i) +{ + w[i] = SHA256_F4(w[i - 2]) + w[i - 7] + SHA256_F3(w[i - 15]) + w[i - 16]; +} + +static const uint32_t sha256_h0[8] = +{ + 0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, + 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19 +}; + +static const uint32_t 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 +}; + +/** An sha256 context + */ +class SHA256Context : public Encryption::Context +{ + void Transform(unsigned char *message, unsigned block_nb) + { + uint32_t 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] = this->h[j]; + for (j = 0; j < 64; ++j) + { + uint32_t t1 = wv[7] + SHA256_F2(wv[4]) + CH(wv[4], wv[5], wv[6]) + sha256_k[j] + w[j]; + uint32_t 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) + this->h[j] += wv[j]; + } + } + + unsigned tot_len; + unsigned len; + unsigned char block[2 * SHA256_BLOCK_SIZE]; + uint32_t h[8]; + unsigned char digest[SHA256_DIGEST_SIZE]; + + public: + SHA256Context(Encryption::IV *iv) + { + if (iv != NULL) + { + if (iv->second != 8) + throw CoreException("Invalid IV size"); + for (int i = 0; i < 8; ++i) + this->h[i] = iv->first[i]; + } + else + for (int i = 0; i < 8; ++i) + this->h[i] = sha256_h0[i]; + + this->tot_len = 0; + this->len = 0; + memset(this->block, 0, sizeof(this->block)); + memset(this->digest, 0, sizeof(this->digest)); + } + + void Update(const unsigned char *message, size_t mlen) override + { + unsigned tmp_len = SHA256_BLOCK_SIZE - this->len, rem_len = mlen < tmp_len ? mlen : tmp_len; + + memcpy(&this->block[this->len], message, rem_len); + if (this->len + mlen < SHA256_BLOCK_SIZE) + { + this->len += mlen; + return; + } + unsigned new_len = mlen - rem_len, block_nb = new_len / SHA256_BLOCK_SIZE; + unsigned char *shifted_message = new unsigned char[mlen - rem_len]; + memcpy(shifted_message, message + rem_len, mlen - rem_len); + this->Transform(this->block, 1); + this->Transform(shifted_message, block_nb); + rem_len = new_len % SHA256_BLOCK_SIZE; + memcpy(this->block, &shifted_message[block_nb << 6], rem_len); + delete [] shifted_message; + this->len = rem_len; + this->tot_len += (block_nb + 1) << 6; + } + + void Finalize() override + { + unsigned block_nb = 1 + ((SHA256_BLOCK_SIZE - 9) < (this->len % SHA256_BLOCK_SIZE)); + unsigned len_b = (this->tot_len + this->len) << 3; + unsigned pm_len = block_nb << 6; + memset(this->block + this->len, 0, pm_len - this->len); + this->block[this->len] = 0x80; + UNPACK32(len_b, this->block + pm_len - 4); + this->Transform(this->block, block_nb); + for (int i = 0 ; i < 8; ++i) + UNPACK32(this->h[i], &this->digest[i << 2]); + } + + Encryption::Hash GetFinalizedHash() override + { + Encryption::Hash hash; + hash.first = this->digest; + hash.second = SHA256_DIGEST_SIZE; + return hash; + } +}; + +class SHA256Provider : public Encryption::Provider +{ + public: + SHA256Provider(Module *creator) : Encryption::Provider(creator, "sha256") { } + + Encryption::Context *CreateContext(Encryption::IV *iv) override + { + return new SHA256Context(iv); + } + + Encryption::IV GetDefaultIV() override + { + Encryption::IV iv; + iv.first = sha256_h0; + iv.second = sizeof(sha256_h0) / sizeof(uint32_t); + return iv; + } +}; + +class ESHA256 : public Module + , public EventHook<Event::Encrypt> + , public EventHook<Event::CheckAuthentication> +{ + SHA256Provider sha256provider; + + 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] = static_cast<uint32_t>(rand()); + } + + /* 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, sizeof(buf2)); + for (int i = 0 ; i < 8; ++i) + PACK32(reinterpret_cast<unsigned char *>(&buf2[i << 2]), iv[i]); + } + + public: + ESHA256(const Anope::string &modname, const Anope::string &creator) : Module(modname, creator, ENCRYPTION | VENDOR) + , EventHook<Event::Encrypt>(this) + , EventHook<Event::CheckAuthentication>(this) + , sha256provider(this) + { + + + use_iv = false; + } + + EventReturn OnEncrypt(const Anope::string &src, Anope::string &dest) override + { + if (!use_iv) + NewRandomIV(); + else + use_iv = false; + + Encryption::IV initilization(this->iv, 8); + SHA256Context ctx(&initilization); + ctx.Update(reinterpret_cast<const unsigned char *>(src.c_str()), src.length()); + ctx.Finalize(); + + Encryption::Hash hash = ctx.GetFinalizedHash(); + + std::stringstream buf; + buf << "sha256:" << Anope::Hex(reinterpret_cast<const char *>(hash.first), hash.second) << ":" << GetIVString(); + logger.Debug2("hashed password from [{0}] to [{1}]", src, buf.str()); + dest = buf.str(); + return EVENT_ALLOW; + } + + void OnCheckAuthentication(User *, NickServ::IdentifyRequest *req) override + { + NickServ::Nick *na = NickServ::FindNick(req->GetAccount()); + if (na == NULL) + return; + NickServ::Account *nc = na->GetAccount(); + + size_t pos = nc->GetPassword().find(':'); + if (pos == Anope::string::npos) + return; + Anope::string hash_method(nc->GetPassword().substr(0, pos)); + if (!hash_method.equals_cs("sha256")) + return; + + GetIVFromPass(nc->GetPassword()); + use_iv = true; + Anope::string buf; + this->OnEncrypt(req->GetPassword(), buf); + if (nc->GetPassword().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) + { + Anope::string p; + Anope::Encrypt(req->GetPassword(), p); + nc->SetPassword(p); + } + req->Success(this); + } + } +}; + +MODULE_INIT(ESHA256) |