commit bb486e43183bfbf3ac9a237cef0737577ddac1bb Author: Romain Tartiere Date: Fri Dec 18 20:32:25 2009 +0000 Import libfreefare into trunk. diff --git a/AUTHORS b/AUTHORS new file mode 100644 index 0000000..e69de29 diff --git a/COPYING b/COPYING new file mode 100644 index 0000000..cca7fc2 --- /dev/null +++ b/COPYING @@ -0,0 +1,165 @@ + GNU LESSER GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + + This version of the GNU Lesser General Public License incorporates +the terms and conditions of version 3 of the GNU General Public +License, supplemented by the additional permissions listed below. + + 0. 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If the Library as you +received it does not specify a version number of the GNU Lesser +General Public License, you may choose any version of the GNU Lesser +General Public License ever published by the Free Software Foundation. + + If the Library as you received it specifies that a proxy can decide +whether future versions of the GNU Lesser General Public License shall +apply, that proxy's public statement of acceptance of any version is +permanent authorization for you to choose that version for the +Library. diff --git a/ChangeLog b/ChangeLog new file mode 100644 index 0000000..e69de29 diff --git a/Makefile.am b/Makefile.am new file mode 100644 index 0000000..f0370b1 --- /dev/null +++ b/Makefile.am @@ -0,0 +1,11 @@ + +ACLOCAL_AMFLAGS = -I m4 + +AM_CFLAGS = -std=c99 @LIBNFC_CFLAGS@ +AM_LDFLAGS = @LIBNFC_LIBS@ + +lib_LTLIBRARIES = libfreefare.la + +libfreefare_la_SOURCES = mifare_classic.c +libfreefare_la_HEADERS = mifare_classic.h +libfreefare_ladir = $(includedir) diff --git a/NEWS b/NEWS new file mode 100644 index 0000000..e69de29 diff --git a/README b/README new file mode 100644 index 0000000..e69de29 diff --git a/configure.ac b/configure.ac new file mode 100644 index 0000000..3c9508d --- /dev/null +++ b/configure.ac @@ -0,0 +1,30 @@ +AC_INIT([libfreefare], [0.0.0]) + +AC_CONFIG_MACRO_DIR([m4]) + +AC_PROG_CC +AC_PROG_CXX + +AC_PROG_LIBTOOL + +AM_INIT_AUTOMAKE + +m4_ifdef([AM_SILENT_RULES],[AM_SILENT_RULES([yes])]) + +# Checks for typedefs, structures, and compiler characteristics. +AC_HEADER_STDBOOL +AC_TYPE_INT16_T +AC_TYPE_INT32_T +AC_TYPE_UINT8_T +AC_TYPE_UINT16_T +AC_TYPE_UINT32_T +AC_TYPE_SIZE_T + +# Checks for library functions. +AC_FUNC_MALLOC +AC_FUNC_REALLOC + +# Checks for pkg-config modules. +PKG_CHECK_MODULES([LIBNFC], [libnfc], [], [AC_MSG_ERROR([libnfc is mandatory.])]) + +AC_OUTPUT([Makefile]) diff --git a/mifare_classic.c b/mifare_classic.c new file mode 100644 index 0000000..d7a79e4 --- /dev/null +++ b/mifare_classic.c @@ -0,0 +1,618 @@ +/*- + * Copyright (C) 2009, Romain Tartiere, Romuald Conty. + * + * This program is free software: you can redistribute it and/or modify it + * under the terms of the GNU Lesser General Public License as published by the + * Free Software Foundation, either version 3 of the License, or (at your + * option) any later version. + * + * 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 Lesser General Public License + * along with this program. If not, see + * + * $Id$ + */ + +#define _BSD_SOURCE +#include +#include +#include +#include + +#include + +#include "mifare_classic.h" + +struct mifare_classic_tag { + nfc_device_t *device; + nfc_iso14443a_info_t info; + int active; + + /* + * The following block numbers are on 2 bytes in order to use invalid + * address and avoid false cache hit with inconsistent data. + */ + struct { + int16_t sector_trailer_block_number; + uint16_t sector_access_bits; + int16_t block_number; + uint8_t block_access_bits; + } cached_access_bits; +}; + +union mifare_classic_block { + unsigned char data[16]; + struct { + uint32_t value; + uint32_t value_; + uint32_t value__; + MifareClassicBlockNumber address; + MifareClassicBlockNumber address_; + MifareClassicBlockNumber address__; + MifareClassicBlockNumber address___; + } value; +}; + +typedef unsigned char MifareClassicAccessBits; + +unsigned char mifare_data_access_permissions[] = { +/* + * [ Key A ] [ Key B ] + * | | + * ,----------- r(ead) | + * |,---------- w(rite) | + * ||,--------- d(ecrement) | + * |||,-------- i(ncrement) | + * |||| | + * |||| ,------------------------ r + * ,----- C3 |||| |,----------------------- w + * |,---- C2 |||| ||,---------------------- d + * ||,--- C1 |||| |||,--------------------- i + * ||| |||| |||| + * 0b000 0b 1111 1111 */ 0xff, +/* 0b001 0b 1000 1100 */ 0x8c, +/* 0b010 0b 1000 1000 */ 0x88, +/* 0b011 0b 1010 1111 */ 0xaf, +/* 0b100 0b 1010 1010 */ 0xaa, +/* 0b101 0b 0000 1000 */ 0x08, +/* 0b110 0b 0000 1100 */ 0x0c, +/* 0b111 0b 0000 0000 */ 0x00 +}; + +uint16_t mifare_trailer_access_permissions[] = { +/* + * [ Key A ] [ Access bits ] [ Key B ] + * | | | + * ,----------- read A | | + * |,---------- read B | | + * ||,--------- write A | | + * |||,-------- write B | | + * |||| | | + * |||| ,----------------------- read A | + * |||| |,---------------------- read B | + * |||| ||,--------------------- write A | + * |||| |||,-------------------- write B | + * |||| |||| | + * |||| |||| ,----------------------------------- read A + * ,----- C3 |||| |||| |,---------------------------------- read B + * |,---- C2 |||| |||| ||,--------------------------------- write A + * ||,--- C1 |||| |||| |||,-------------------------------- write B + * ||| |||| |||| |||| + * 0b000 0b 0010 1000 1010*/ 0x28a, +/* 0b001 0b 0001 1100 0000*/ 0x1c0, +/* 0b010 0b 0000 1000 1000*/ 0x088, +/* 0b011 0b 0000 1100 0000*/ 0x0c0, +/* 0b100 0b 0010 1010 1010*/ 0x2aa, +/* 0b101 0b 0000 1101 0000*/ 0x0d0, +/* 0b110 0b 0001 1101 0001*/ 0x1d1, +/* 0b111 0b 0000 1100 0000*/ 0x0c0 +}; + + +/* + * Private functions + */ + +int get_block_access_bits (MifareClassicTag tag, MifareClassicBlockNumber block, MifareClassicAccessBits *block_access_bits); + + +/* + * MIFARE card communication preparation functions + * + * The following functions send NFC commands to the initiator to prepare + * communication with a MIFARE card, and perform required cleannups after using + * the target. + */ + +/* + * Get a list of the MIFARE card near to the provided NFC initiator. + * + * The list can be freed using the mifare_classic_free_tags() function. + */ +MifareClassicTag * +mifare_classic_get_tags (nfc_device_t *device) +{ + MifareClassicTag *tags = NULL; + int tag_count = 0; + + nfc_initiator_init(device); + + // Drop the field for a while + nfc_configure(device,NDO_ACTIVATE_FIELD,false); + + // Let the reader only try once to find a tag + nfc_configure(device,NDO_INFINITE_SELECT,false); + + // Configure the CRC and Parity settings + nfc_configure(device,NDO_HANDLE_CRC,true); + nfc_configure(device,NDO_HANDLE_PARITY,true); + + // Enable field so more power consuming cards can power themselves up + nfc_configure(device,NDO_ACTIVATE_FIELD,true); + + // Poll for a ISO14443A (MIFARE) tag + nfc_target_info_t target_info; + + while (nfc_initiator_select_tag(device,NM_ISO14443A_106,NULL,0,&target_info)) { + + // Ensure the target is a MIFARE classic tag. + if (!((target_info.nai.abtAtqa[0] == 0x00) && + (target_info.nai.abtAtqa[1] == 0x04) && + (target_info.nai.btSak == 0x08)) && /* NXP MIFARE Classic 1K */ + !((target_info.nai.abtAtqa[0] == 0x00) && + (target_info.nai.abtAtqa[1] == 0x02) && + (target_info.nai.btSak == 0x18)) && /* NXP MIFARE Classic 4K */ + !((target_info.nai.abtAtqa[0] == 0x00) && + (target_info.nai.abtAtqa[1] == 0x02) && + (target_info.nai.btSak == 0x38))) /* Nokia MIFARE Classic 4K - emulated */ + continue; + + tag_count++; + + /* (Re)Allocate memory for the found MIFARE classic array */ + if (!tags) { + if (!(tags = malloc ((tag_count) * sizeof (MifareClassicTag) + sizeof (void *)))) { + return NULL; + } + } else { + MifareClassicTag *p = realloc (tags, (tag_count) * sizeof (MifareClassicTag) + sizeof (void *)); + if (p) + tags = p; + else + return p; // FAIL! Return what has been found so far. + } + + /* Allocate memory for the found MIFARE classic tag */ + if (!(tags[tag_count-1] = malloc (sizeof (struct mifare_classic_tag)))) { + return tags; // FAIL! Return what has been found before. + } + (tags[tag_count-1])->device = device; + (tags[tag_count-1])->info = target_info.nai; + (tags[tag_count-1])->active = 0; + tags[tag_count] = NULL; + + nfc_initiator_deselect_tag (device); + } + + return tags; +} + +/* + * Free the provided tag list. + */ +void +mifare_classic_free_tags (MifareClassicTag *tags) +{ + if (tags) { + for (int i=0; tags[i]; i++) { + free (tags[i]); + } + free (tags); + } +} + +/* + * Establish connection to the provided tag. + */ +int +mifare_classic_connect (MifareClassicTag tag) +{ + if (tag->active) { + errno = EINVAL; + return -1; + } + + nfc_target_info_t pnti; + if (nfc_initiator_select_tag (tag->device, NM_ISO14443A_106, tag->info.abtUid, 4, &pnti)) { + tag->active = 1; + } + return 0; +} + +/* + * Terminate connection with the provided tag. + */ +int +mifare_classic_disconnect (MifareClassicTag tag) +{ + if (!(tag->active)) { + errno = EINVAL; + return -1; + } + + if (nfc_initiator_deselect_tag (tag->device)) { + tag->active = 0; + } + return 0; +} + + +/* + * Card manipulation functions + * + * The following functions perform direct communication with the connected + * MIFARE card. + */ + +/* + * Send an authentification command to the provided MIFARE target. + */ +int +mifare_classic_authenticate (MifareClassicTag tag, MifareClassicBlockNumber block, MifareClassicKey key, MifareClassicKeyType key_type) +{ + if (!tag->active) { + errno = EINVAL; + return -1; + } + + unsigned char command[12]; + command[0] = (key_type == MFC_KEY_A) ? MC_AUTH_A : MC_AUTH_B; + command[1] = block; + memcpy (&(command[2]), key, 6); + memcpy (&(command[8]), tag->info.abtUid, 4); + + // Send command + size_t n; + if (!(nfc_initiator_transceive_dep_bytes (tag->device, command, sizeof (command), NULL, &n))) { + errno = EIO; + return -1; + } + + tag->cached_access_bits.sector_trailer_block_number = -1; + tag->cached_access_bits.sector_access_bits = 0x00; + + // No result. The MIFARE tag just ACKed. + return 0; +} + +/* + * Read data from the provided MIFARE target. + */ +int +mifare_classic_read (MifareClassicTag tag, MifareClassicBlockNumber block, MifareClassicBlock *data) +{ + if (!tag->active) { + errno = EINVAL; + return -1; + } + + unsigned char command[2]; + command[0] = MC_READ; + command[1] = block; + + // Send command + size_t n; + if (!(nfc_initiator_transceive_dep_bytes (tag->device, command, sizeof (command), *data, &n))) { + errno = EIO; + return -1; + } + + return 0; +} + +int +mifare_classic_init_value (MifareClassicTag tag, MifareClassicBlockNumber block, int32_t value, MifareClassicBlockNumber adr) +{ + union mifare_classic_block b; + + b.value.value = value; + b.value.value_ = ~value; + b.value.value__ = value; + + b.value.address = adr; + b.value.address_ = ~adr; + b.value.address__ = adr; + b.value.address___ = ~adr; + + if (mifare_classic_write (tag, block, b.data) < 0) + return -1; + + return 0; +} + +int +mifare_classic_read_value (MifareClassicTag tag, MifareClassicBlockNumber block, int32_t *value, MifareClassicBlockNumber *adr) +{ + MifareClassicBlock data; + if (mifare_classic_read (tag, block, &data) < 0) + return -1; + + union mifare_classic_block b = *((union mifare_classic_block *)(&data)); + + + if ((b.value.value != (~b.value.value_)) || (b.value.value != b.value.value__)) { + errno = EIO; + return -1; + } + + if ((b.value.address != (unsigned char)(~b.value.address_)) || (b.value.address != b.value.address__) || (b.value.address_ != b.value.address___)) { + errno = EIO; + return -1; + } + + if (value) + *value = le32toh (b.value.value); + + if (adr) + *adr = b.value.address; + + return 0; +} + +/* + * Write data to the provided MIFARE target. + */ +int +mifare_classic_write (MifareClassicTag tag, MifareClassicBlockNumber block, MifareClassicBlock data) +{ + if (!tag->active) { + errno = EINVAL; + return -1; + } + + unsigned char command[2 + sizeof (MifareClassicBlock)]; + command[0] = MC_WRITE; + command[1] = block; + memcpy (&(command[2]), data, sizeof (MifareClassicBlock)); + + // Send command + size_t n; + if (!(nfc_initiator_transceive_dep_bytes (tag->device, command, sizeof (command), NULL, &n))) { + errno = EIO; + return -1; + } + + // No result. The MIFARE tag just ACKed. + return 0; +} + +/* + * Increment the given value block by the provided amount into the internal + * data register. + */ +int +mifare_classic_increment (MifareClassicTag tag, MifareClassicBlockNumber block, uint32_t amount) +{ + if (!tag->active) { + errno = EINVAL; + return -1; + } + + unsigned char command[6]; + command[0] = MC_INCREMENT; + command[1] = block; + int32_t le_amount = htole32 (amount); + memcpy(&(command[2]), &le_amount, sizeof (le_amount)); + + // Send command + size_t n; + if (!(nfc_initiator_transceive_dep_bytes (tag->device, command, sizeof (command), NULL, &n))) { + errno = EIO; + return -1; + } + + // No result. The MIFARE tag just ACKed. + return 0; +} + +/* + * Decrement the given value block by the provided amount into the internal + * data register. + */ +int +mifare_classic_decrement (MifareClassicTag tag, MifareClassicBlockNumber block, uint32_t amount) +{ + if (!tag->active) { + errno = EINVAL; + return -1; + } + + unsigned char command[6]; + command[0] = MC_DECREMENT; + command[1] = block; + int32_t le_amount = htole32 (amount); + memcpy(&(command[2]), &le_amount, sizeof (le_amount)); + + // Send command + size_t n; + if (!(nfc_initiator_transceive_dep_bytes (tag->device, command, sizeof (command), NULL, &n))) { + errno = EIO; + return -1; + } + + // No result. The MIFARE tag just ACKed. + return 0; +} + +/* + * Store the provided block to the internal data register. + */ +int +mifare_classic_restore (MifareClassicTag tag, MifareClassicBlockNumber block) +{ + if (!tag->active) { + errno = EINVAL; + return -1; + } + + unsigned char command[2]; + /* XXX Should be MC_RESTORE according to the MIFARE documentation. */ + command[0] = MC_STORE; + command[1] = block; + + // Send command + size_t n; + if (!(nfc_initiator_transceive_dep_bytes (tag->device, command, sizeof (command), NULL, &n))) { + errno = EIO; + return -1; + } + + // No result. The MIFARE tag just ACKed. + return 0; +} + +/* + * Store the internal data register to the provided block. + */ +int +mifare_classic_transfer (MifareClassicTag tag, MifareClassicBlockNumber block) +{ + if (!tag->active) { + errno = EINVAL; + return -1; + } + + unsigned char command[2]; + command[0] = MC_TRANSFER; + command[1] = block; + + // Send command + size_t n; + if (!(nfc_initiator_transceive_dep_bytes (tag->device, command, sizeof (command), NULL, &n))) { + errno = EIO; + return -1; + } + + // No result. The MIFARE tag just ACKed. + return 0; +} + + +/* + * Access bit manipulation functions + * + * The following functions provide a convenient API for reading MIFARE card + * access bits. A cache system makes these functions query a single time the + * MIFARE card regardless of the number of information requested between two + * authentifications (i.e. for the current sector). + */ + +/* + * Fetch access bits for a given block from the block's sector's trailing + * block. + */ +int +get_block_access_bits (MifareClassicTag tag, MifareClassicBlockNumber block, MifareClassicAccessBits *block_access_bits) +{ + /* + * The first block which holds the manufacturer block seems to have + * inconsistent access bits. + */ + if (block == 0) { + errno = EINVAL; + return -1; + } + + uint16_t sector_access_bits, sector_access_bits_; + + MifareClassicBlockNumber trailer = ((block) / 4) * 4 + 3; + + if (tag->cached_access_bits.sector_trailer_block_number == trailer) { + /* cache hit! */ + sector_access_bits = tag->cached_access_bits.sector_access_bits; + } else { + + MifareClassicBlock trailer_data; + if (mifare_classic_read (tag, trailer, &trailer_data) < 0) { + return -1; + } + + sector_access_bits_ = trailer_data[6] | ((trailer_data[7] & 0x0f) << 8) | 0xf000; + sector_access_bits = ((trailer_data[7] & 0xf0) >> 4) | (trailer_data[8] << 4); + + if (sector_access_bits != (uint16_t) ~sector_access_bits_) { + /* Sector locked */ + errno = EIO; + return -1; + } + tag->cached_access_bits.sector_trailer_block_number = trailer; + tag->cached_access_bits.block_number = -1; + tag->cached_access_bits.sector_access_bits = sector_access_bits; + } + + if (tag->cached_access_bits.block_number == block) { + /* cache hit! */ + *block_access_bits = tag->cached_access_bits.block_access_bits; + } else { + *block_access_bits = 0; + /* ,-------C3 + * |,------C2 + * ||,---- C1 + * ||| */ + uint16_t block_access_bits_mask = 0x0111 << (block % 4); + /* ||| + * ||`---------------. + * |`---------------.| + * `---------------.|| + * ||| */ + if (sector_access_bits & block_access_bits_mask & 0x000f) *block_access_bits |= 0x01; /* C1 */ + if (sector_access_bits & block_access_bits_mask & 0x00f0) *block_access_bits |= 0x02; /* C2 */ + if (sector_access_bits & block_access_bits_mask & 0x0f00) *block_access_bits |= 0x04; /* C3 */ + + tag->cached_access_bits.block_access_bits = *block_access_bits; + } + + return 0; +} + +/* + * Get information about the trailer block. + */ +int +mifare_classic_get_trailer_block_permission (MifareClassicTag tag, MifareClassicBlockNumber block, uint16_t permission, MifareClassicKeyType key_type) +{ + MifareClassicAccessBits access_bits; + if (get_block_access_bits (tag, block, &access_bits) < 0) { + return -1; + } + + if (tag->cached_access_bits.sector_trailer_block_number == block) { + return (mifare_trailer_access_permissions[access_bits] & (permission) << ((key_type == MFC_KEY_A) ? 1 : 0)) ? 1 : 0; + } else { + errno = EINVAL; + return -1; + } +} + +/* + * Get information about data blocks. + */ +int +mifare_classic_get_data_block_permission (MifareClassicTag tag, MifareClassicBlockNumber block, unsigned char permission, MifareClassicKeyType key_type) +{ + MifareClassicAccessBits access_bits; + if (get_block_access_bits (tag, block, &access_bits) < 0) { + return -1; + } + + if (tag->cached_access_bits.sector_trailer_block_number != block) { + return ((mifare_data_access_permissions[access_bits] & (permission << ( (key_type == MFC_KEY_A) ? 4 : 0 ))) ? 1 : 0); + } else { + errno = EINVAL; + return -1; + } +} diff --git a/mifare_classic.h b/mifare_classic.h new file mode 100644 index 0000000..3daa8c2 --- /dev/null +++ b/mifare_classic.h @@ -0,0 +1,70 @@ +/*- + * Copyright (C) 2009, Romain Tartiere, Romuald Conty. + * + * This program is free software: you can redistribute it and/or modify it + * under the terms of the GNU Lesser General Public License as published by the + * Free Software Foundation, either version 3 of the License, or (at your + * option) any later version. + * + * 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 Lesser General Public License + * along with this program. If not, see + * + * $Id$ + */ + +#ifndef __MIFARE_CLASSIC_H__ +#define __MIFARE_CLASSIC_H__ + +struct mifare_classic_tag; +typedef struct mifare_classic_tag *MifareClassicTag; + +// struct mifare_block; +// typedef struct mifare_block *MifareClassicBlock; +typedef unsigned char MifareClassicBlock[16]; + +typedef unsigned char MifareClassicBlockNumber; + +typedef enum { MFC_KEY_A, MFC_KEY_B } MifareClassicKeyType; +typedef unsigned char MifareClassicKey[6]; + +MifareClassicTag *mifare_classic_get_tags (nfc_device_t *device); +void mifare_classic_free_tags (MifareClassicTag *tags); + +int mifare_classic_connect (MifareClassicTag tag); +int mifare_classic_disconnect (MifareClassicTag tag); + +int mifare_classic_authenticate (MifareClassicTag tag, MifareClassicBlockNumber block, MifareClassicKey key, MifareClassicKeyType key_type); + +int mifare_classic_read (MifareClassicTag tag, MifareClassicBlockNumber block, MifareClassicBlock *data); +int mifare_classic_init_value (MifareClassicTag tag, MifareClassicBlockNumber block, int32_t value, MifareClassicBlockNumber adr); +int mifare_classic_read_value (MifareClassicTag tag, MifareClassicBlockNumber block, int32_t *value, MifareClassicBlockNumber *adr); +int mifare_classic_write (MifareClassicTag tag, MifareClassicBlockNumber block, MifareClassicBlock data); + + +int mifare_classic_get_trailer_block_permission (MifareClassicTag tag, MifareClassicBlockNumber block, uint16_t permission, MifareClassicKeyType key_type); +int mifare_classic_get_data_block_permission (MifareClassicTag tag, MifareClassicBlockNumber block, unsigned char permission, MifareClassicKeyType key_type); +int mifare_classic_increment (MifareClassicTag tag, MifareClassicBlockNumber block, uint32_t amount); +int mifare_classic_decrement (MifareClassicTag tag, MifareClassicBlockNumber block, uint32_t amount); +int mifare_classic_restore (MifareClassicTag tag, MifareClassicBlockNumber block); +int mifare_classic_transfer (MifareClassicTag tag, MifareClassicBlockNumber block); + + +/* MIFARE Classic Access Bits */ +#define MCAB_R 0x8 +#define MCAB_W 0x4 +#define MCAB_D 0x2 +#define MCAB_I 0x1 + +#define MCAB_READ_KEYA 0x400 +#define MCAB_WRITE_KEYA 0x100 +#define MCAB_READ_ACCESS_BITS 0x040 +#define MCAB_WRITE_ACCESS_BITS 0x010 +#define MCAB_READ_KEYB 0x004 +#define MCAB_WRITE_KEYB 0x001 + +#endif /* !__MIFARE_CLASSIC_H__ */