mirror of
https://github.com/weechat/weechat.git
synced 2026-06-26 21:06:38 +02:00
Fredrik Fornwall
677 lines
17 KiB
C
677 lines
17 KiB
C
/*
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* core-crypto.c - cryptographic functions
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*
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* Copyright (C) 2018-2024 Sébastien Helleu <flashcode@flashtux.org>
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*
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* This file is part of WeeChat, the extensible chat client.
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*
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* WeeChat is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* WeeChat is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with WeeChat. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <sys/stat.h>
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#include <time.h>
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#include <math.h>
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#include <gcrypt.h>
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#ifdef __ANDROID__
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/* Bring in htobe64 */
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#define _BSD_SOURCE
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#include <endian.h>
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#endif
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#include "weechat.h"
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#include "core-crypto.h"
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#include "core-config-file.h"
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#include "core-hashtable.h"
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#include "core-string.h"
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#include "../plugins/plugin.h"
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#ifdef htonll
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#define htobe64 htonll
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#endif
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char *weecrypto_hash_algo_string[] = {
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"crc32",
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"md5",
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"sha1",
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"sha224",
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"sha256",
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"sha384",
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"sha512",
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#if GCRYPT_VERSION_NUMBER >= 0x010700
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"sha3-224",
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"sha3-256",
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"sha3-384",
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"sha3-512",
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#endif
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#if GCRYPT_VERSION_NUMBER >= 0x010800
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"blake2b-160",
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"blake2b-256",
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"blake2b-384",
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"blake2b-512",
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"blake2s-128",
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"blake2s-160",
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"blake2s-224",
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"blake2s-256",
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#endif
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#if GCRYPT_VERSION_NUMBER >= 0x010904
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"sha512-224",
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"sha512-256",
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#endif
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NULL,
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};
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int weecrypto_hash_algo[] = {
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GCRY_MD_CRC32,
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GCRY_MD_MD5,
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GCRY_MD_SHA1,
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GCRY_MD_SHA224,
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GCRY_MD_SHA256,
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GCRY_MD_SHA384,
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GCRY_MD_SHA512,
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#if GCRYPT_VERSION_NUMBER >= 0x010700
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GCRY_MD_SHA3_224,
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GCRY_MD_SHA3_256,
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GCRY_MD_SHA3_384,
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GCRY_MD_SHA3_512,
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#endif
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#if GCRYPT_VERSION_NUMBER >= 0x010800
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GCRY_MD_BLAKE2B_160,
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GCRY_MD_BLAKE2B_256,
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GCRY_MD_BLAKE2B_384,
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GCRY_MD_BLAKE2B_512,
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GCRY_MD_BLAKE2S_128,
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GCRY_MD_BLAKE2S_160,
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GCRY_MD_BLAKE2S_224,
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GCRY_MD_BLAKE2S_256,
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#endif
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#if GCRYPT_VERSION_NUMBER >= 0x010904
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GCRY_MD_SHA512_224,
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GCRY_MD_SHA512_256,
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#endif
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};
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char *weecrypto_cipher_string[] = {
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"aes128",
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"aes192",
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"aes256",
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NULL,
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};
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int weecrypto_cipher[] = {
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GCRY_CIPHER_AES128,
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GCRY_CIPHER_AES192,
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GCRY_CIPHER_AES256,
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};
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/*
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* Returns the hash algorithm with the name, or GCRY_MD_NONE if not found.
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*/
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int
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weecrypto_get_hash_algo (const char *hash_algo)
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{
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int i;
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if (!hash_algo)
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return GCRY_MD_NONE;
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for (i = 0; weecrypto_hash_algo_string[i]; i++)
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{
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if (strcmp (weecrypto_hash_algo_string[i], hash_algo) == 0)
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return weecrypto_hash_algo[i];
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}
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return GCRY_MD_NONE;
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}
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/*
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* Returns the cipher with the name, or GCRY_CIPHER_NONE if not found.
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*/
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int
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weecrypto_get_cipher (const char *cipher)
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{
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int i;
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if (!cipher)
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return GCRY_CIPHER_NONE;
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for (i = 0; weecrypto_cipher_string[i]; i++)
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{
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if (strcmp (weecrypto_cipher_string[i], cipher) == 0)
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return weecrypto_cipher[i];
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}
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return GCRY_CIPHER_NONE;
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}
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/*
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* Computes hash of data using the given hash algorithm.
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*
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* The hash size depends on the algorithm, common ones are:
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*
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* GCRY_MD_CRC32 32 bits == 4 bytes
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* GCRY_MD_MD5 128 bits == 16 bytes
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* GCRY_MD_SHA1 160 bits == 20 bytes
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* GCRY_MD_SHA224 224 bits == 28 bytes
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* GCRY_MD_SHA256 256 bits == 32 bytes
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* GCRY_MD_SHA384 384 bits == 48 bytes
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* GCRY_MD_SHA512 512 bits == 64 bytes
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* GCRY_MD_SHA512_256 256 bits == 32 bytes (libgcrypt ≥ 1.9.4)
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* GCRY_MD_SHA512_224 224 bits == 28 bytes (libgcrypt ≥ 1.9.4)
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* GCRY_MD_SHA3_224 224 bits == 28 bytes (libgcrypt ≥ 1.7.0)
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* GCRY_MD_SHA3_256 256 bits == 32 bytes (libgcrypt ≥ 1.7.0)
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* GCRY_MD_SHA3_384 384 bits == 48 bytes (libgcrypt ≥ 1.7.0)
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* GCRY_MD_SHA3_512 512 bits == 64 bytes (libgcrypt ≥ 1.7.0)
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* GCRY_MD_BLAKE2B_160 160 bits == 20 bytes (libgcrypt ≥ 1.8.0)
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* GCRY_MD_BLAKE2B_256 256 bits == 32 bytes (libgcrypt ≥ 1.8.0)
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* GCRY_MD_BLAKE2B_384 384 bits == 48 bytes (libgcrypt ≥ 1.8.0)
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* GCRY_MD_BLAKE2B_512 512 bits == 64 bytes (libgcrypt ≥ 1.8.0)
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* GCRY_MD_BLAKE2S_128 128 bits == 16 bytes (libgcrypt ≥ 1.8.0)
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* GCRY_MD_BLAKE2S_160 160 bits == 20 bytes (libgcrypt ≥ 1.8.0)
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* GCRY_MD_BLAKE2S_224 224 bits == 28 bytes (libgcrypt ≥ 1.8.0)
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* GCRY_MD_BLAKE2S_256 256 bits == 32 bytes (libgcrypt ≥ 1.8.0)
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*
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* The result hash is stored in "hash" (the buffer must be large enough).
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*
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* If hash_size is not NULL, the length of hash is stored in *hash_size
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* (in bytes).
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*
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* Returns:
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* 1: OK
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* 0: error
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*/
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int
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weecrypto_hash (const void *data, int data_size, int hash_algo,
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void *hash, int *hash_size)
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{
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gcry_md_hd_t *hd_md;
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int rc, hd_md_opened, algo_size;
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unsigned char *ptr_hash;
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rc = 0;
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hd_md = NULL;
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hd_md_opened = 0;
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if (!hash)
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goto hash_end;
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if (hash_size)
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*hash_size = 0;
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if (!data || (data_size < 1))
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goto hash_end;
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hd_md = malloc (sizeof (gcry_md_hd_t));
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if (!hd_md)
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goto hash_end;
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if (gcry_md_open (hd_md, hash_algo, 0) != 0)
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goto hash_end;
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hd_md_opened = 1;
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gcry_md_write (*hd_md, data, data_size);
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ptr_hash = gcry_md_read (*hd_md, hash_algo);
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if (!ptr_hash)
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goto hash_end;
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algo_size = gcry_md_get_algo_dlen (hash_algo);
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memcpy (hash, ptr_hash, algo_size);
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if (hash_size)
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*hash_size = algo_size;
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rc = 1;
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hash_end:
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if (hd_md)
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{
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if (hd_md_opened)
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gcry_md_close (*hd_md);
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free (hd_md);
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}
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return rc;
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}
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/*
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* Computes hash of file using the given hash algorithm.
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*
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* The hash size depends on the algorithm, common ones are:
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*
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* GCRY_MD_CRC32 32 bits == 4 bytes
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* GCRY_MD_MD5 128 bits == 16 bytes
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* GCRY_MD_SHA1 160 bits == 20 bytes
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* GCRY_MD_SHA224 224 bits == 28 bytes
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* GCRY_MD_SHA256 256 bits == 32 bytes
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* GCRY_MD_SHA384 384 bits == 48 bytes
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* GCRY_MD_SHA512 512 bits == 64 bytes
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* GCRY_MD_SHA512_224 224 bits == 28 bytes (libgcrypt ≥ 1.9.4)
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* GCRY_MD_SHA512_256 256 bits == 32 bytes (libgcrypt ≥ 1.9.4)
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* GCRY_MD_SHA3_224 224 bits == 28 bytes (libgcrypt ≥ 1.7.0)
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* GCRY_MD_SHA3_256 256 bits == 32 bytes (libgcrypt ≥ 1.7.0)
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* GCRY_MD_SHA3_384 384 bits == 48 bytes (libgcrypt ≥ 1.7.0)
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* GCRY_MD_SHA3_512 512 bits == 64 bytes (libgcrypt ≥ 1.7.0)
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* GCRY_MD_BLAKE2B_160 160 bits == 20 bytes (libgcrypt ≥ 1.8.0)
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* GCRY_MD_BLAKE2B_256 256 bits == 32 bytes (libgcrypt ≥ 1.8.0)
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* GCRY_MD_BLAKE2B_384 384 bits == 48 bytes (libgcrypt ≥ 1.8.0)
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* GCRY_MD_BLAKE2B_512 512 bits == 64 bytes (libgcrypt ≥ 1.8.0)
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* GCRY_MD_BLAKE2S_128 128 bits == 16 bytes (libgcrypt ≥ 1.8.0)
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* GCRY_MD_BLAKE2S_160 160 bits == 20 bytes (libgcrypt ≥ 1.8.0)
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* GCRY_MD_BLAKE2S_224 224 bits == 28 bytes (libgcrypt ≥ 1.8.0)
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* GCRY_MD_BLAKE2S_256 256 bits == 32 bytes (libgcrypt ≥ 1.8.0)
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*
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* The result hash is stored in "hash" (the buffer must be large enough).
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*
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* If hash_size is not NULL, the length of hash is stored in *hash_size
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* (in bytes).
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*
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* Returns:
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* 1: OK
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* 0: error
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*/
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int
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weecrypto_hash_file (const char *filename, int hash_algo,
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void *hash, int *hash_size)
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{
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gcry_md_hd_t *hd_md;
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FILE *file;
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size_t num_read;
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int rc, hd_md_opened, algo_size;
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unsigned char *ptr_hash;
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char buffer[4096];
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rc = 0;
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hd_md = NULL;
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hd_md_opened = 0;
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file = NULL;
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if (!hash)
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goto hash_end;
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if (hash_size)
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*hash_size = 0;
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if (!filename || !filename[0] || !hash)
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goto hash_end;
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file = fopen (filename, "r");
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if (!file)
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goto hash_end;
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hd_md = malloc (sizeof (gcry_md_hd_t));
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if (!hd_md)
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goto hash_end;
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if (gcry_md_open (hd_md, hash_algo, 0) != 0)
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goto hash_end;
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hd_md_opened = 1;
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while (!feof (file))
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{
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num_read = fread (buffer, 1, sizeof (buffer), file);
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if (num_read == 0)
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break;
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gcry_md_write (*hd_md, buffer, num_read);
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}
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ptr_hash = gcry_md_read (*hd_md, hash_algo);
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if (!ptr_hash)
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goto hash_end;
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algo_size = gcry_md_get_algo_dlen (hash_algo);
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memcpy (hash, ptr_hash, algo_size);
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if (hash_size)
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*hash_size = algo_size;
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rc = 1;
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hash_end:
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if (hd_md)
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{
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if (hd_md_opened)
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gcry_md_close (*hd_md);
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free (hd_md);
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}
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if (file)
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fclose (file);
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return rc;
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}
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/*
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* Computes PKCS#5 Passphrase Based Key Derivation Function number 2 (PBKDF2)
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* hash of data.
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*
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* The hash size depends on the algorithm, common ones are:
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*
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* GCRY_MD_SHA1 160 bits == 20 bytes
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* GCRY_MD_SHA256 256 bits == 32 bytes
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* GCRY_MD_SHA512 512 bits == 64 bytes
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*
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* The result hash is stored in "hash" (the buffer must be large enough).
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*
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* If hash_size is not NULL, the length of hash is stored in *hash_size
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* (in bytes).
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*
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* Returns:
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* 1: OK
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* 0: error
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*/
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int
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weecrypto_hash_pbkdf2 (const void *data, int data_size, int hash_algo,
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const void *salt, int salt_size, int iterations,
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void *hash, int *hash_size)
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{
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int rc, algo_size;
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rc = 0;
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if (!hash)
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goto hash_pbkdf2_end;
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if (hash_size)
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*hash_size = 0;
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if (!data || (data_size < 1) || !salt || (salt_size < 1)
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|| (iterations < 1))
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{
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goto hash_pbkdf2_end;
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}
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algo_size = gcry_md_get_algo_dlen (hash_algo);
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if (gcry_kdf_derive (data, data_size, GCRY_KDF_PBKDF2, hash_algo,
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salt, salt_size, iterations,
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algo_size, hash) != 0)
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{
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goto hash_pbkdf2_end;
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}
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if (hash_size)
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*hash_size = algo_size;
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rc = 1;
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hash_pbkdf2_end:
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return rc;
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}
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/*
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* Computes keyed-hash message authentication code (HMAC).
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*
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* The hash size depends on the algorithm, common ones are:
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*
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* GCRY_MD_CRC32 32 bits == 4 bytes
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* GCRY_MD_MD5 128 bits == 16 bytes
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* GCRY_MD_SHA1 160 bits == 20 bytes
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* GCRY_MD_SHA224 224 bits == 28 bytes
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* GCRY_MD_SHA256 256 bits == 32 bytes
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* GCRY_MD_SHA384 384 bits == 48 bytes
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* GCRY_MD_SHA512 512 bits == 64 bytes
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* GCRY_MD_SHA512_224 224 bits == 28 bytes (libgcrypt ≥ 1.9.4)
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* GCRY_MD_SHA512_256 256 bits == 32 bytes (libgcrypt ≥ 1.9.4)
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* GCRY_MD_SHA3_224 224 bits == 28 bytes (libgcrypt ≥ 1.7.0)
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* GCRY_MD_SHA3_256 256 bits == 32 bytes (libgcrypt ≥ 1.7.0)
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* GCRY_MD_SHA3_384 384 bits == 48 bytes (libgcrypt ≥ 1.7.0)
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* GCRY_MD_SHA3_512 512 bits == 64 bytes (libgcrypt ≥ 1.7.0)
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* GCRY_MD_BLAKE2B_160 160 bits == 20 bytes (libgcrypt ≥ 1.8.0)
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* GCRY_MD_BLAKE2B_256 256 bits == 32 bytes (libgcrypt ≥ 1.8.0)
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* GCRY_MD_BLAKE2B_384 384 bits == 48 bytes (libgcrypt ≥ 1.8.0)
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* GCRY_MD_BLAKE2B_512 512 bits == 64 bytes (libgcrypt ≥ 1.8.0)
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* GCRY_MD_BLAKE2S_128 128 bits == 16 bytes (libgcrypt ≥ 1.8.0)
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* GCRY_MD_BLAKE2S_160 160 bits == 20 bytes (libgcrypt ≥ 1.8.0)
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* GCRY_MD_BLAKE2S_224 224 bits == 28 bytes (libgcrypt ≥ 1.8.0)
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* GCRY_MD_BLAKE2S_256 256 bits == 32 bytes (libgcrypt ≥ 1.8.0)
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*
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* The result hash is stored in "hash" (the buffer must be large enough).
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*
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* If hash_size is not NULL, the length of hash is stored in *hash_size
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* (in bytes).
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*
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* Returns:
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* 1: OK
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* 0: error
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*/
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int
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weecrypto_hmac (const void *key, int key_size,
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const void *message, int message_size,
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int hash_algo,
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void *hash, int *hash_size)
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{
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gcry_md_hd_t *hd_md;
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int rc, hd_md_opened, algo_size;
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unsigned char *ptr_hash;
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rc = 0;
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hd_md = NULL;
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hd_md_opened = 0;
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if (!hash)
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goto hmac_end;
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if (hash_size)
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*hash_size = 0;
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if (!key || (key_size < 1) || !message || (message_size < 1))
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goto hmac_end;
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hd_md = malloc (sizeof (gcry_md_hd_t));
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if (!hd_md)
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goto hmac_end;
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if (gcry_md_open (hd_md, hash_algo, GCRY_MD_FLAG_HMAC) != 0)
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goto hmac_end;
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hd_md_opened = 1;
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|
if (gcry_md_setkey (*hd_md, key, key_size) != 0)
|
|
goto hmac_end;
|
|
|
|
gcry_md_write (*hd_md, message, message_size);
|
|
|
|
ptr_hash = gcry_md_read (*hd_md, hash_algo);
|
|
if (!ptr_hash)
|
|
goto hmac_end;
|
|
|
|
algo_size = gcry_md_get_algo_dlen (hash_algo);
|
|
memcpy (hash, ptr_hash, algo_size);
|
|
if (hash_size)
|
|
*hash_size = algo_size;
|
|
|
|
rc = 1;
|
|
|
|
hmac_end:
|
|
if (hd_md)
|
|
{
|
|
if (hd_md_opened)
|
|
gcry_md_close (*hd_md);
|
|
free (hd_md);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Generates a Time-based One-Time Password (TOTP), as described
|
|
* in the RFC 6238.
|
|
*
|
|
* Returns:
|
|
* 1: OK
|
|
* 0: error
|
|
*/
|
|
|
|
int
|
|
weecrypto_totp_generate_internal (const char *secret, int length_secret,
|
|
uint64_t moving_factor, int digits,
|
|
char *result)
|
|
{
|
|
uint64_t moving_factor_swapped;
|
|
char hash[20];
|
|
int rc, offset, length;
|
|
unsigned long bin_code;
|
|
|
|
moving_factor_swapped = htobe64 (moving_factor);
|
|
rc = weecrypto_hmac (secret, length_secret,
|
|
&moving_factor_swapped, sizeof (moving_factor_swapped),
|
|
GCRY_MD_SHA1,
|
|
hash, NULL);
|
|
if (!rc)
|
|
return 0;
|
|
|
|
offset = hash[19] & 0xf;
|
|
bin_code = (hash[offset] & 0x7f) << 24
|
|
| (hash[offset+1] & 0xff) << 16
|
|
| (hash[offset+2] & 0xff) << 8
|
|
| (hash[offset+3] & 0xff);
|
|
|
|
bin_code %= (unsigned long)(pow (10, digits));
|
|
|
|
length = snprintf (result, digits + 1, "%.*lu", digits, bin_code);
|
|
if (length != digits)
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Generates a Time-based One-Time Password (TOTP), as described
|
|
* in the RFC 6238.
|
|
*
|
|
* Returns the password as string, NULL if error.
|
|
*
|
|
* Note: result must be freed after use.
|
|
*/
|
|
|
|
char *
|
|
weecrypto_totp_generate (const char *secret_base32, time_t totp_time,
|
|
int digits)
|
|
{
|
|
char *result, *secret;
|
|
int length_secret, rc;
|
|
uint64_t moving_factor;
|
|
|
|
secret = NULL;
|
|
result = NULL;
|
|
|
|
if (!secret_base32 || !secret_base32[0]
|
|
|| (digits < WEECRYPTO_TOTP_MIN_DIGITS)
|
|
|| (digits > WEECRYPTO_TOTP_MAX_DIGITS))
|
|
{
|
|
goto error;
|
|
}
|
|
|
|
secret = malloc ((strlen (secret_base32) * 4) + 16 + 1);
|
|
if (!secret)
|
|
goto error;
|
|
|
|
length_secret = string_base32_decode (secret_base32, secret);
|
|
if (length_secret < 0)
|
|
goto error;
|
|
|
|
result = malloc (digits + 1);
|
|
if (!result)
|
|
goto error;
|
|
|
|
if (totp_time == 0)
|
|
totp_time = time (NULL);
|
|
|
|
moving_factor = totp_time / 30;
|
|
|
|
rc = weecrypto_totp_generate_internal (secret, length_secret,
|
|
moving_factor, digits, result);
|
|
if (!rc)
|
|
goto error;
|
|
|
|
free (secret);
|
|
|
|
return result;
|
|
|
|
error:
|
|
free (secret);
|
|
free (result);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Validates a Time-based One-Time Password (TOTP).
|
|
*
|
|
* Returns:
|
|
* 1: OTP is OK
|
|
* 0: OTP is invalid
|
|
*/
|
|
|
|
int
|
|
weecrypto_totp_validate (const char *secret_base32, time_t totp_time,
|
|
int window, const char *otp)
|
|
{
|
|
char *secret, str_otp[16];
|
|
int length_secret, digits, rc, otp_ok;
|
|
uint64_t i, moving_factor;
|
|
|
|
secret = NULL;
|
|
|
|
if (!secret_base32 || !secret_base32[0] || (window < 0) || !otp || !otp[0])
|
|
goto error;
|
|
|
|
digits = strlen (otp);
|
|
if ((digits < WEECRYPTO_TOTP_MIN_DIGITS)
|
|
|| (digits > WEECRYPTO_TOTP_MAX_DIGITS))
|
|
{
|
|
goto error;
|
|
}
|
|
|
|
secret = malloc (strlen (secret_base32) + 1);
|
|
if (!secret)
|
|
goto error;
|
|
|
|
length_secret = string_base32_decode (secret_base32, secret);
|
|
if (length_secret < 0)
|
|
goto error;
|
|
|
|
if (totp_time == 0)
|
|
totp_time = time (NULL);
|
|
|
|
moving_factor = totp_time / 30;
|
|
|
|
otp_ok = 0;
|
|
|
|
for (i = moving_factor - window; i <= moving_factor + window; i++)
|
|
{
|
|
rc = weecrypto_totp_generate_internal (secret, length_secret,
|
|
i, digits, str_otp);
|
|
if (rc && (strcmp (str_otp, otp) == 0))
|
|
{
|
|
otp_ok = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
free (secret);
|
|
|
|
return otp_ok;
|
|
|
|
error:
|
|
free (secret);
|
|
return 0;
|
|
}
|