299 lines
8.9 KiB
C
299 lines
8.9 KiB
C
//==============================================================================
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// This file is part of Master Password.
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// Copyright (c) 2011-2017, Maarten Billemont.
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//
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// Master Password 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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// Master Password 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 can find a copy of the GNU General Public License in the
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// LICENSE file. Alternatively, see <http://www.gnu.org/licenses/>.
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//==============================================================================
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#include <string.h>
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#include <ctype.h>
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#if MPW_COLOR
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#include <unistd.h>
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#include <curses.h>
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#include <term.h>
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#endif
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#if HAS_CPERCIVA
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#include <scrypt/crypto_scrypt.h>
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#include <scrypt/sha256.h>
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#elif HAS_SODIUM
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#include "sodium.h"
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#endif
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#include "mpw-util.h"
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int mpw_verbosity = inf_level;
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bool mpw_push_buf(uint8_t **const buffer, size_t *const bufferSize, const void *pushBuffer, const size_t pushSize) {
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if (*bufferSize == (size_t)-1)
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// The buffer was marked as broken, it is missing a previous push. Abort to avoid corrupt content.
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return false;
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*bufferSize += pushSize;
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uint8_t *resizedBuffer = realloc( *buffer, *bufferSize );
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if (!resizedBuffer) {
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// realloc failed, we can't push. Mark the buffer as broken.
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mpw_free( *buffer, *bufferSize - pushSize );
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*bufferSize = (size_t)-1;
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*buffer = NULL;
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return false;
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}
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*buffer = resizedBuffer;
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uint8_t *pushDst = *buffer + *bufferSize - pushSize;
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memcpy( pushDst, pushBuffer, pushSize );
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return true;
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}
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bool mpw_push_string(uint8_t **buffer, size_t *const bufferSize, const char *pushString) {
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return mpw_push_buf( buffer, bufferSize, pushString, strlen( pushString ) );
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}
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bool mpw_push_int(uint8_t **const buffer, size_t *const bufferSize, const uint32_t pushInt) {
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return mpw_push_buf( buffer, bufferSize, &pushInt, sizeof( pushInt ) );
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}
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bool mpw_free(const void *buffer, const size_t bufferSize) {
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if (!buffer)
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return false;
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memset( (void *)buffer, 0, bufferSize );
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free( (void *)buffer );
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return true;
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}
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bool mpw_free_string(const char *string) {
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return string && mpw_free( string, strlen( string ) );
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}
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uint8_t const *mpw_scrypt(const size_t keySize, const char *secret, const uint8_t *salt, const size_t saltSize,
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uint64_t N, uint32_t r, uint32_t p) {
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if (!secret || !salt)
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return NULL;
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uint8_t *key = malloc( keySize );
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if (!key)
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return NULL;
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#if HAS_CPERCIVA
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if (crypto_scrypt( (const uint8_t *)secret, strlen( secret ), salt, saltSize, N, r, p, key, keySize ) < 0) {
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mpw_free( key, keySize );
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return NULL;
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}
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#elif HAS_SODIUM
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if (crypto_pwhash_scryptsalsa208sha256_ll( (const uint8_t *)secret, strlen( secret ), salt, saltSize, N, r, p, key, keySize ) != 0) {
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mpw_free( key, keySize );
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return NULL;
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}
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#endif
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return key;
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}
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uint8_t const *mpw_hmac_sha256(const uint8_t *key, const size_t keySize, const uint8_t *salt, const size_t saltSize) {
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#if HAS_CPERCIVA
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uint8_t *const buffer = malloc( 32 );
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if (!buffer)
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return NULL;
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HMAC_SHA256_Buf( key, keySize, salt, saltSize, buffer );
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return buffer;
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#elif HAS_SODIUM
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uint8_t *const buffer = malloc( crypto_auth_hmacsha256_BYTES );
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if (!buffer)
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return NULL;
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crypto_auth_hmacsha256_state state;
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if (crypto_auth_hmacsha256_init( &state, key, keySize ) != 0 ||
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crypto_auth_hmacsha256_update( &state, salt, saltSize ) != 0 ||
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crypto_auth_hmacsha256_final( &state, buffer ) != 0) {
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mpw_free( buffer, crypto_auth_hmacsha256_BYTES );
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return NULL;
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}
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return buffer;
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#endif
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return NULL;
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}
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MPKeyID mpw_id_buf(const void *buf, size_t length) {
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if (!buf)
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return "<unset>";
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#if HAS_CPERCIVA
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uint8_t hash[32];
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SHA256_Buf( buf, length, hash );
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#elif HAS_SODIUM
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uint8_t hash[crypto_hash_sha256_BYTES];
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crypto_hash_sha256( hash, buf, length );
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#endif
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return mpw_hex( hash, sizeof( hash ) / sizeof( uint8_t ) );
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}
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bool mpw_id_buf_equals(const char *id1, const char *id2) {
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size_t size = strlen( id1 );
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if (size != strlen( id2 ))
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return false;
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for (size_t c = 0; c < size; ++c)
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if (tolower( id1[c] ) != tolower( id2[c] ))
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return false;
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return true;
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}
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static char **mpw_hex_buf = NULL;
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static unsigned int mpw_hex_buf_i = 0;
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const char *mpw_hex(const void *buf, size_t length) {
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// FIXME
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if (!mpw_hex_buf) {
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mpw_hex_buf = malloc( 10 * sizeof( char * ) );
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for (uint8_t i = 0; i < 10; ++i)
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mpw_hex_buf[i] = NULL;
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}
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mpw_hex_buf_i = (mpw_hex_buf_i + 1) % 10;
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mpw_hex_buf[mpw_hex_buf_i] = realloc( mpw_hex_buf[mpw_hex_buf_i], length * 2 + 1 );
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for (size_t kH = 0; kH < length; kH++)
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sprintf( &(mpw_hex_buf[mpw_hex_buf_i][kH * 2]), "%02X", ((const uint8_t *)buf)[kH] );
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return mpw_hex_buf[mpw_hex_buf_i];
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}
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const char *mpw_hex_l(uint32_t number) {
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return mpw_hex( &number, sizeof( number ) );
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}
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#ifdef COLOR
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static int putvari;
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static char *putvarc = NULL;
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static int termsetup;
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static int initputvar() {
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if (!isatty(STDERR_FILENO))
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return 0;
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if (putvarc)
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free( putvarc );
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if (!termsetup) {
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int status;
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if (! (termsetup = (setupterm( NULL, STDERR_FILENO, &status ) == 0 && status == 1))) {
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wrn( "Terminal doesn't support color (setupterm errno %d).\n", status );
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return 0;
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}
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}
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putvarc=(char *)calloc(256, sizeof(char));
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putvari=0;
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return 1;
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}
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static int putvar(int c) {
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putvarc[putvari++]=c;
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return 0;
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}
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#endif
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const char *mpw_identicon(const char *fullName, const char *masterPassword) {
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const char *leftArm[] = { "╔", "╚", "╰", "═" };
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const char *rightArm[] = { "╗", "╝", "╯", "═" };
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const char *body[] = { "█", "░", "▒", "▓", "☺", "☻" };
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const char *accessory[] = {
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"◈", "◎", "◐", "◑", "◒", "◓", "☀", "☁", "☂", "☃", "☄", "★", "☆", "☎", "☏", "⎈", "⌂", "☘", "☢", "☣",
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"☕", "⌚", "⌛", "⏰", "⚡", "⛄", "⛅", "☔", "♔", "♕", "♖", "♗", "♘", "♙", "♚", "♛", "♜", "♝", "♞", "♟",
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"♨", "♩", "♪", "♫", "⚐", "⚑", "⚔", "⚖", "⚙", "⚠", "⌘", "⏎", "✄", "✆", "✈", "✉", "✌"
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};
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const uint8_t *identiconSeed = mpw_hmac_sha256( (const uint8_t *)masterPassword, strlen( masterPassword ), (const uint8_t *)fullName,
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strlen( fullName ) );
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if (!identiconSeed)
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return NULL;
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char *colorString, *resetString;
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#ifdef COLOR
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if (initputvar()) {
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uint8_t colorIdentifier = (uint8_t)(identiconSeed[4] % 7 + 1);
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tputs(tparm(tgetstr("AF", NULL), colorIdentifier), 1, putvar);
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colorString = calloc(strlen(putvarc) + 1, sizeof(char));
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strcpy(colorString, putvarc);
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tputs(tgetstr("me", NULL), 1, putvar);
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resetString = calloc(strlen(putvarc) + 1, sizeof(char));
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strcpy(resetString, putvarc);
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} else
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#endif
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{
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colorString = calloc( 1, sizeof( char ) );
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resetString = calloc( 1, sizeof( char ) );
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}
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char *identicon = (char *)calloc( 256, sizeof( char ) );
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snprintf( identicon, 256, "%s%s%s%s%s%s",
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colorString,
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leftArm[identiconSeed[0] % (sizeof( leftArm ) / sizeof( leftArm[0] ))],
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body[identiconSeed[1] % (sizeof( body ) / sizeof( body[0] ))],
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rightArm[identiconSeed[2] % (sizeof( rightArm ) / sizeof( rightArm[0] ))],
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accessory[identiconSeed[3] % (sizeof( accessory ) / sizeof( accessory[0] ))],
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resetString );
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mpw_free( identiconSeed, 32 );
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free( colorString );
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free( resetString );
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return identicon;
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}
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/**
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* @return the amount of bytes used by UTF-8 to encode a single character that starts with the given byte.
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*/
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static int mpw_utf8_sizeof(unsigned char utf8Byte) {
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if (!utf8Byte)
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return 0;
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if ((utf8Byte & 0x80) == 0)
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return 1;
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if ((utf8Byte & 0xC0) != 0xC0)
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return 0;
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if ((utf8Byte & 0xE0) == 0xC0)
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return 2;
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if ((utf8Byte & 0xF0) == 0xE0)
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return 3;
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if ((utf8Byte & 0xF8) == 0xF0)
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return 4;
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return 0;
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}
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const size_t mpw_utf8_strlen(const char *utf8String) {
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// TODO: is this ever different from strlen?
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size_t charlen = 0;
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char *remainingString = (char *)utf8String;
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for (int charByteSize; (charByteSize = mpw_utf8_sizeof( (unsigned char)*remainingString )); remainingString += charByteSize)
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++charlen;
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return charlen;
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}
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