New API function mifare_desfire_set_ats().

NEWS

@@ -5,8 +5,8 @@ Changes between 0.2.3 and 0.3.0  [XX xxx XXXX]
   *) Add support for 3K3DES and AES cryptographic operations.
   *) New functions mifare_desfire_free_mem(),
      mifare_desfire_set_configuration(), mifare_desfire_set_default_key(),
-     mifare_desfire_get_card_uid(), for Mifare DESFire EV1 targets
-     manipulation.
+     mifare_desfire_set_ats(), mifare_desfire_get_card_uid(), for Mifare
+     DESFire EV1 targets manipulation.
   *) Deprecate authentication information when deleting the currently selected
      application
 

examples/Makefile.am

@@ -6,6 +6,7 @@ AM_LDFLAGS = @LIBNFC_LIBS@
 bin_PROGRAMS = mifare-classic-format \
 	       mifare-classic-write-ndef \
 	       mifare-desfire-access \
+	       mifare-desfire-ev1-configure-ats \
 	       mifare-desfire-ev1-configure-default-key \
 	       mifare-desfire-ev1-configure-random-uid \
 	       mifare-desfire-format \
@@ -21,6 +22,9 @@ mifare_classic_write_ndef_LDADD = -lnfc $(top_builddir)/libfreefare/libfreefare.
 mifare_desfire_access_SOURCES = mifare-desfire-access.c
 mifare_desfire_access_LDADD = -lnfc $(top_builddir)/libfreefare/libfreefare.la
 
+mifare_desfire_ev1_configure_ats_SOURCES = mifare-desfire-ev1-configure-ats.c
+mifare_desfire_ev1_configure_ats_LDADD = -lnfc $(top_builddir)/libfreefare/libfreefare.la
+
 mifare_desfire_ev1_configure_default_key_SOURCES = mifare-desfire-ev1-configure-default-key.c
 mifare_desfire_ev1_configure_default_key_LDADD = -lnfc $(top_builddir)/libfreefare/libfreefare.la
 

examples/mifare-desfire-ev1-configure-ats.c

@@ -0,0 +1,153 @@
+/*-
+ * Copyright (C) 2010, Romain Tartiere.
+ * 
+ * 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 <http://www.gnu.org/licenses/>
+ * 
+ * $Id$
+ */
+
+#include "config.h"
+
+#include <err.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <nfc/nfc.h>
+
+#include <freefare.h>
+
+uint8_t null_key_data[8] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+
+uint8_t new_ats[] = { 0x06, 0x75, 0x77, 0x81, 0x02, 0x42 };
+
+struct {
+    bool interactive;
+} configure_options = {
+    .interactive = true
+};
+
+void
+usage(char *progname)
+{
+    fprintf (stderr, "usage: %s [-y]\n", progname);
+    fprintf (stderr, "\nOptions:\n");
+    fprintf (stderr, "  -y     Do not ask for confirmation (dangerous)\n");
+}
+
+int
+main(int argc, char *argv[])
+{
+    int ch;
+    int error = EXIT_SUCCESS;
+    nfc_device_t *device = NULL;
+    MifareTag *tags = NULL;
+
+    while ((ch = getopt (argc, argv, "hy")) != -1) {
+	switch (ch) {
+	case 'h':
+	    usage(argv[0]);
+	    exit (EXIT_SUCCESS);
+	    break;
+	case 'y':
+	    configure_options.interactive = false;
+	    break;
+	default:
+	    usage(argv[0]);
+	    exit (EXIT_FAILURE);
+	}
+    }
+    argc -= optind;
+    argv += optind;
+
+    nfc_device_desc_t devices[8];
+    size_t device_count;
+
+    nfc_list_devices (devices, 8, &device_count);
+    if (!device_count)
+	errx (EXIT_FAILURE, "No NFC device found.");
+
+    for (size_t d = 0; (!error) && (d < device_count); d++) {
+	device = nfc_connect (&(devices[d]));
+	if (!device) {
+	    warnx ("nfc_connect() failed.");
+	    error = EXIT_FAILURE;
+	    continue;
+	}
+
+	tags = freefare_get_tags (device);
+	if (!tags) {
+	    nfc_disconnect (device);
+	    errx (EXIT_FAILURE, "Error listing Mifare DESFire tags.");
+	}
+
+	for (int i = 0; (!error) && tags[i]; i++) {
+	    if (DESFIRE != freefare_get_tag_type (tags[i]))
+		continue;
+
+	    char *tag_uid = freefare_get_tag_uid (tags[i]);
+	    char buffer[BUFSIZ];
+
+	    printf ("Found %s with UID %s. ", freefare_get_tag_friendly_name (tags[i]), tag_uid);
+	    bool do_it = true;
+	    int res;
+
+	    if (configure_options.interactive) {
+		printf ("Change ATS? [yN] ");
+		fgets (buffer, BUFSIZ, stdin);
+		do_it = ((buffer[0] == 'y') || (buffer[0] == 'Y'));
+	    } else {
+		printf ("\n");
+	    }
+
+	    if (do_it) {
+
+		res = mifare_desfire_connect (tags[i]);
+		if (res < 0) {
+		    warnx ("Can't connect to Mifare DESFire target.");
+		    error = EXIT_FAILURE;
+		    break;
+		}
+
+		MifareDESFireKey default_key = mifare_desfire_des_key_new_with_version (null_key_data);
+		res = mifare_desfire_authenticate (tags[i], 0, default_key);
+		if (res < 0) {
+		    freefare_perror (tags[i], "mifare_desfire_authenticate");
+		    error = EXIT_FAILURE;
+		    break;
+		}
+		mifare_desfire_key_free (default_key);
+
+		res = mifare_desfire_set_ats (tags[i], new_ats);
+		if (res < 0) {
+		    freefare_perror (tags[i], "mifare_desfire_set_ats");
+		    error = EXIT_FAILURE;
+		    break;
+		}
+
+		mifare_desfire_disconnect (tags[i]);
+
+	    }
+
+	    free (tag_uid);
+	}
+
+	freefare_free_tags (tags);
+	nfc_disconnect (device);
+    }
+
+    exit (error);
+} /* main() */
+

libfreefare/freefare.h

@@ -320,6 +320,7 @@ int		 mifare_desfire_get_version (MifareTag tag, struct mifare_desfire_version_i
 int		 mifare_desfire_free_mem (MifareTag tag, uint32_t *size);
 int		 mifare_desfire_set_configuration (MifareTag tag, bool disable_format, bool enable_random_uid);
 int		 mifare_desfire_set_default_key (MifareTag tag, MifareDESFireKey key);
+int		 mifare_desfire_set_ats (MifareTag tag, uint8_t *ats);
 int		 mifare_desfire_get_card_uid (MifareTag tag, char **uid);
 int		 mifare_desfire_get_file_ids (MifareTag tag, uint8_t *files[], size_t *count);
 int		 mifare_desfire_get_file_settings (MifareTag tag, uint8_t file_no, struct mifare_desfire_file_settings *settings);

libfreefare/mifare_desfire.c

@@ -929,6 +929,40 @@ mifare_desfire_set_default_key (MifareTag tag, MifareDESFireKey key)
     return 0;
 }
 
+int
+mifare_desfire_set_ats (MifareTag tag, uint8_t *ats)
+{
+    ASSERT_ACTIVE (tag);
+    ASSERT_MIFARE_DESFIRE (tag);
+
+    BUFFER_INIT (cmd, 34);
+    BUFFER_INIT (res, 1 + CMAC_LENGTH);
+
+    BUFFER_APPEND (cmd, 0x5C);
+    BUFFER_APPEND (cmd, 0x02);
+    BUFFER_APPEND_BYTES (cmd, ats, *ats);
+    switch (MIFARE_DESFIRE (tag)->authentication_scheme) {
+    case AS_LEGACY:
+	iso14443a_crc_append (cmd + 2 , __cmd_n - 2);
+	__cmd_n += 2;
+	break;
+    case AS_NEW:
+	desfire_crc32_append (cmd, __cmd_n);
+	__cmd_n += 4;
+	break;
+    }
+    BUFFER_APPEND (cmd, 0x80);
+
+    uint8_t *p = mifare_cryto_preprocess_data (tag, cmd, &__cmd_n, 2, MDCM_ENCIPHERED | NO_CRC | ENC_COMMAND);
+
+    DESFIRE_TRANSCEIVE2 (tag, p, __cmd_n, res);
+
+    ssize_t sn = __res_n;
+    p = mifare_cryto_postprocess_data (tag, res, &sn, MDCM_PLAIN | CMAC_COMMAND | CMAC_VERIFY);
+
+    return 0;
+}
+
 int
 mifare_desfire_get_card_uid (MifareTag tag, char **uid)
 {