/* $OpenBSD: yubikey.c,v 1.5 2014/10/08 04:47:20 deraadt Exp $ */ /* * Written by Simon Josefsson . * Copyright (c) 2006, 2007, 2008, 2009 Yubico AB * Copyright (c) 2010 Daniel Hartmeier * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * * 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. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT * OWNER 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 #include #include #include #include #include "yubikey.h" #include "keymaps.h" static const uint8_t RC[] = { 0x1, 0x2, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80, 0x1B, 0x36 }; static const uint8_t rijndael_sbox[] = { 0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76, 0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0, 0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0, 0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15, 0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A, 0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75, 0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0, 0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84, 0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B, 0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF, 0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, 0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8, 0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5, 0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2, 0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17, 0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73, 0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88, 0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB, 0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C, 0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79, 0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9, 0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08, 0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6, 0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A, 0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E, 0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E, 0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94, 0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF, 0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, 0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16 }; static const uint8_t rijndael_inv_sbox[] = { 0x52, 0x09, 0x6A, 0xD5, 0x30, 0x36, 0xA5, 0x38, 0xBF, 0x40, 0xA3, 0x9E, 0x81, 0xF3, 0xD7, 0xFB, 0x7C, 0xE3, 0x39, 0x82, 0x9B, 0x2F, 0xFF, 0x87, 0x34, 0x8E, 0x43, 0x44, 0xC4, 0xDE, 0xE9, 0xCB, 0x54, 0x7B, 0x94, 0x32, 0xA6, 0xC2, 0x23, 0x3D, 0xEE, 0x4C, 0x95, 0x0B, 0x42, 0xFA, 0xC3, 0x4E, 0x08, 0x2E, 0xA1, 0x66, 0x28, 0xD9, 0x24, 0xB2, 0x76, 0x5B, 0xA2, 0x49, 0x6D, 0x8B, 0xD1, 0x25, 0x72, 0xF8, 0xF6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xD4, 0xA4, 0x5C, 0xCC, 0x5D, 0x65, 0xB6, 0x92, 0x6C, 0x70, 0x48, 0x50, 0xFD, 0xED, 0xB9, 0xDA, 0x5E, 0x15, 0x46, 0x57, 0xA7, 0x8D, 0x9D, 0x84, 0x90, 0xD8, 0xAB, 0x00, 0x8C, 0xBC, 0xD3, 0x0A, 0xF7, 0xE4, 0x58, 0x05, 0xB8, 0xB3, 0x45, 0x06, 0xD0, 0x2C, 0x1E, 0x8F, 0xCA, 0x3F, 0x0F, 0x02, 0xC1, 0xAF, 0xBD, 0x03, 0x01, 0x13, 0x8A, 0x6B, 0x3A, 0x91, 0x11, 0x41, 0x4F, 0x67, 0xDC, 0xEA, 0x97, 0xF2, 0xCF, 0xCE, 0xF0, 0xB4, 0xE6, 0x73, 0x96, 0xAC, 0x74, 0x22, 0xE7, 0xAD, 0x35, 0x85, 0xE2, 0xF9, 0x37, 0xE8, 0x1C, 0x75, 0xDF, 0x6E, 0x47, 0xF1, 0x1A, 0x71, 0x1D, 0x29, 0xC5, 0x89, 0x6F, 0xB7, 0x62, 0x0E, 0xAA, 0x18, 0xBE, 0x1B, 0xFC, 0x56, 0x3E, 0x4B, 0xC6, 0xD2, 0x79, 0x20, 0x9A, 0xDB, 0xC0, 0xFE, 0x78, 0xCD, 0x5A, 0xF4, 0x1F, 0xDD, 0xA8, 0x33, 0x88, 0x07, 0xC7, 0x31, 0xB1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xEC, 0x5F, 0x60, 0x51, 0x7F, 0xA9, 0x19, 0xB5, 0x4A, 0x0D, 0x2D, 0xE5, 0x7A, 0x9F, 0x93, 0xC9, 0x9C, 0xEF, 0xA0, 0xE0, 0x3B, 0x4D, 0xAE, 0x2A, 0xF5, 0xB0, 0xC8, 0xEB, 0xBB, 0x3C, 0x83, 0x53, 0x99, 0x61, 0x17, 0x2B, 0x04, 0x7E, 0xBA, 0x77, 0xD6, 0x26, 0xE1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0C, 0x7D }; static inline uint8_t xtime(uint8_t b) { return (b & 0x80) ? ((b << 1) ^ 0x1b) : (b << 1); } #define NUMBER_OF_ROUNDS 10 void yubikey_aes_decrypt(uint8_t *state, const uint8_t *key) { uint8_t i, j, round_key[0x10]; uint8_t a02x, a13x; uint8_t a02xx, a13xx; uint8_t k1, k2; memcpy(round_key, key, sizeof(round_key)); for (i = 0; i < NUMBER_OF_ROUNDS; i++) { round_key[0] ^= RC[i]; round_key[0] ^= rijndael_sbox[round_key[13]]; round_key[1] ^= rijndael_sbox[round_key[14]]; round_key[2] ^= rijndael_sbox[round_key[15]]; round_key[3] ^= rijndael_sbox[round_key[12]]; for (j = 4; j < 16; j++) round_key[j] ^= round_key[j - 4]; } for (i = 0; i < 0x10; i++) state[i] ^= round_key[i]; for (i = 1; i <= NUMBER_OF_ROUNDS; i++) { /* inv_byte_sub_shift_row(); */ /* First row: 0 shift, 0 4 8 12 */ state[0] = rijndael_inv_sbox[state[0]]; state[4] = rijndael_inv_sbox[state[4]]; state[8] = rijndael_inv_sbox[state[8]]; state[12] = rijndael_inv_sbox[state[12]]; /* Second row: -1 shift, 1 5 9 13 */ j = state[13]; state[13] = rijndael_inv_sbox[state[9]]; state[9] = rijndael_inv_sbox[state[5]]; state[5] = rijndael_inv_sbox[state[1]]; state[1] = rijndael_inv_sbox[j]; /* Third row: -2 shift, 2 6 10 14 */ j = state[2]; state[2] = rijndael_inv_sbox[state[10]]; state[10] = rijndael_inv_sbox[j]; j = state[6]; state[6] = rijndael_inv_sbox[state[14]]; state[14] = rijndael_inv_sbox[j]; /* Fourth row: -3 shift, 3 7 11 15 */ j = state[3]; state[3] = rijndael_inv_sbox[state[7]]; state[7] = rijndael_inv_sbox[state[11]]; state[11] = rijndael_inv_sbox[state[15]]; state[15] = rijndael_inv_sbox[j]; /* get_inv_round_key(i); */ for (j = 15; j > 3; j--) round_key[j] ^= round_key[j - 4]; round_key[0] ^= (RC[NUMBER_OF_ROUNDS - i] ^ rijndael_sbox[round_key[13]]); round_key[1] ^= rijndael_sbox[round_key[14]]; round_key[2] ^= rijndael_sbox[round_key[15]]; round_key[3] ^= rijndael_sbox[round_key[12]]; for (j = 0; j < 16; j++) state[j] ^= round_key[j]; if (i != NUMBER_OF_ROUNDS) { /* inv_mix_column(); */ for (j = 0; j < 16; j += 4) { k1 = state[j] ^ state[j + 2]; a02x = xtime(k1); k2 = state[j + 1] ^ state[j + 3]; a13x = xtime(k2); k1 ^= (k2 ^ xtime(state[j + 1] ^ state[j + 2])); k2 = k1; a02xx = xtime(a02x); a13xx = xtime(a13x); k1 ^= (xtime(a02xx ^ a13xx) ^ a02xx); k2 ^= (xtime(a02xx ^ a13xx) ^ a13xx); state[j] ^= (k1 ^ a02x); state[j + 1] ^= k2; state[j + 2] ^= (k1 ^ a13x); state[j + 3] ^= (k2 ^ a02x ^ a13x); } } } } uint16_t yubikey_crc16(const uint8_t *buf, size_t buf_size) { uint16_t m_crc = 0xffff; while (buf_size--) { int i, j; m_crc ^= (uint8_t)*buf++ & 0xFF; for (i = 0; i < 8; i++) { j = m_crc & 1; m_crc >>= 1; if (j) m_crc ^= 0x8408; } } return m_crc; } static const char hex_trans[] = "0123456789abcdef"; void yubikey_hex_encode(char *dst, const char *src, size_t srcSize) { while (srcSize--) { *dst++ = hex_trans[(*src >> 4) & 0xf]; *dst++ = hex_trans[*src++ & 0xf]; } *dst = '\0'; } void yubikey_hex_decode(char *dst, const char *src, size_t dstSize) { char b; int flag = 0; char *p1; for (; *src && dstSize > 0; src++) { p1 = strchr(hex_trans, tolower((unsigned char)*src)); if (p1 == NULL) b = 0; else b = (char)(p1 - hex_trans); if ((flag = !flag)) *dst = b; else { *dst = (*dst << 4) | b; dst++; dstSize--; } } while (dstSize--) *dst++ = 0; } static const char modhex_trans[] = "cbdefghijklnrtuv"; void yubikey_modhex_decode(char *dst, const char *src, size_t dstSize) { char b; int flag = 0; char *p1; for (; *src && dstSize > 0; src++) { p1 = strchr(modhex_trans, tolower((unsigned char)*src)); if (p1 == NULL) b = 0; else b = (char)(p1 - modhex_trans); if ((flag = !flag)) *dst = b; else { *dst = (*dst << 4) | b; dst++; dstSize--; } } while (dstSize--) *dst++ = 0; } uint8_t yubikey_keymap_decode(wchar_t *wpassword, char *token, int index) { int c, j, found; for (j=0; j= YUBIKEY_KEYMAP_COUNT) return -1; len = strlen(password); pp = wpassword = reallocarray(NULL, len + 1, sizeof(wchar_t)); if (pp == NULL) return ENOMEM; memset(out, 0, sizeof(*out)); memset(token, 0, YUBIKEY_TOKEN_SIZE + 1); lc_ctype = getenv("LC_CTYPE"); setlocale(LC_CTYPE, lc_ctype ? lc_ctype : "C.UTF-8"); len = mbstowcs(wpassword, password, len); if (len < 0) { return errno; } setlocale(LC_CTYPE, "C"); if (len > YUBIKEY_TOKEN_SIZE) pp = pp + len - YUBIKEY_TOKEN_SIZE; if (len < YUBIKEY_TOKEN_SIZE) return EMSGSIZE; if (yubikey_keymap_decode(pp, token, index)) return EINVAL; yubikey_modhex_decode((void *)out, token, sizeof(*out)); yubikey_aes_decrypt((void *)out, key); return 0; }