summaryrefslogtreecommitdiffstats
path: root/epan/dissectors/packet-rfid-mifare.c
diff options
context:
space:
mode:
Diffstat (limited to 'epan/dissectors/packet-rfid-mifare.c')
-rw-r--r--epan/dissectors/packet-rfid-mifare.c195
1 files changed, 195 insertions, 0 deletions
diff --git a/epan/dissectors/packet-rfid-mifare.c b/epan/dissectors/packet-rfid-mifare.c
new file mode 100644
index 00000000..2cb45dae
--- /dev/null
+++ b/epan/dissectors/packet-rfid-mifare.c
@@ -0,0 +1,195 @@
+/* packet-rfid-mifare.c
+ * Dissector for the NXP MiFare Protocol
+ *
+ * References:
+ * http://code.google.com/p/nfc-tools/source/browse/trunk/libfreefare/libfreefare/mifare_classic.c
+ * http://www.nxp.com/documents/data_sheet/MF1S703x.pdf
+ * http://www.nxp.com/documents/application_note/AN1304.pdf
+ *
+ * Copyright 2011, Tyson Key <tyson.key@gmail.com>
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ */
+
+#include "config.h"
+
+#include <epan/packet.h>
+
+void proto_register_mifare(void);
+
+static int proto_mifare = -1;
+
+static int hf_mifare_command = -1;
+static int hf_mifare_block_address = -1;
+static int hf_mifare_key_a = -1;
+static int hf_mifare_key_b = -1;
+static int hf_mifare_uid = -1;
+static int hf_mifare_operand = -1;
+static int hf_mifare_payload = -1;
+
+#define AUTH_A 0x60
+#define AUTH_B 0x61
+#define READ 0x30
+#define WRITE 0xA0
+#define TRANSFER 0xB0
+#define DECREMENT 0xC0
+#define INCREMENT 0xC1
+#define RESTORE 0xC2
+
+static const value_string hf_mifare_commands[] = {
+ {AUTH_A, "AUTH_A"},
+ {AUTH_B, "AUTH_B"},
+ {READ, "READ"},
+ {WRITE, "WRITE"},
+ {TRANSFER, "TRANSFER"},
+ {DECREMENT, "DECREMENT"},
+ {INCREMENT, "INCREMENT"},
+ {RESTORE, "RESTORE"},
+
+ /* End of commands */
+ {0x00, NULL}
+};
+
+/* Subtree handles: set by register_subtree_array */
+static gint ett_mifare = -1;
+
+static int
+dissect_mifare(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
+{
+ proto_item *item;
+ proto_tree *mifare_tree;
+ guint8 cmd;
+
+
+ col_set_str(pinfo->cinfo, COL_PROTOCOL, "MiFare");
+ col_clear(pinfo->cinfo, COL_INFO);
+
+ /* Start with a top-level item to add everything else to */
+
+ item = proto_tree_add_item(tree, proto_mifare, tvb, 0, -1, ENC_NA);
+ mifare_tree = proto_item_add_subtree(item, ett_mifare);
+
+ proto_tree_add_item(mifare_tree, hf_mifare_command, tvb, 0, 1, ENC_BIG_ENDIAN);
+ cmd = tvb_get_guint8(tvb, 0);
+
+
+ switch (cmd) {
+
+ case AUTH_A:
+ proto_tree_add_item(mifare_tree, hf_mifare_block_address, tvb, 1, 1, ENC_BIG_ENDIAN);
+ proto_tree_add_item(mifare_tree, hf_mifare_key_a, tvb, 2, 6, ENC_BIG_ENDIAN);
+ proto_tree_add_item(mifare_tree, hf_mifare_uid, tvb, 8, 4, ENC_BIG_ENDIAN);
+ col_append_sep_str(pinfo->cinfo, COL_INFO, NULL, "Authenticate with Key A");
+ break;
+
+ case AUTH_B:
+ proto_tree_add_item(mifare_tree, hf_mifare_block_address, tvb, 1, 1, ENC_BIG_ENDIAN);
+ proto_tree_add_item(mifare_tree, hf_mifare_key_b, tvb, 2, 6, ENC_BIG_ENDIAN);
+ proto_tree_add_item(mifare_tree, hf_mifare_uid, tvb, 8, 4, ENC_BIG_ENDIAN);
+ col_append_sep_str(pinfo->cinfo, COL_INFO, NULL, "Authenticate with Key B");
+ break;
+
+ case READ:
+ proto_tree_add_item(mifare_tree, hf_mifare_block_address, tvb, 1, 1, ENC_BIG_ENDIAN);
+ col_append_sep_str(pinfo->cinfo, COL_INFO, NULL, "Read");
+ break;
+
+ case WRITE:
+ col_append_sep_str(pinfo->cinfo, COL_INFO, NULL, "Write");
+
+ /* LibNFC and the TouchATag-branded reader don't expose the 2-byte CRC
+ or 4-bit NAK, as per MF1S703x, so we pretend that they don't exist.
+
+ I've never seen traces with those data structures before, either... */
+
+ proto_tree_add_item(mifare_tree, hf_mifare_block_address, tvb, 1, 1, ENC_BIG_ENDIAN);
+
+ proto_tree_add_item(mifare_tree, hf_mifare_payload, tvb, 2, -1, ENC_NA);
+ break;
+
+ case TRANSFER:
+ proto_tree_add_item(mifare_tree, hf_mifare_block_address, tvb, 1, 1, ENC_BIG_ENDIAN);
+ col_append_sep_str(pinfo->cinfo, COL_INFO, NULL, "Transfer");
+ break;
+
+ case DECREMENT:
+ proto_tree_add_item(mifare_tree, hf_mifare_block_address, tvb, 1, 1, ENC_BIG_ENDIAN);
+ proto_tree_add_item(mifare_tree, hf_mifare_operand, tvb, 2, 4, ENC_BIG_ENDIAN);
+ col_append_sep_str(pinfo->cinfo, COL_INFO, NULL, "Decrement");
+ break;
+
+ case INCREMENT:
+ proto_tree_add_item(mifare_tree, hf_mifare_block_address, tvb, 1, 1, ENC_BIG_ENDIAN);
+ proto_tree_add_item(mifare_tree, hf_mifare_operand, tvb, 2, 4, ENC_BIG_ENDIAN);
+ col_append_sep_str(pinfo->cinfo, COL_INFO, NULL, "Increment");
+ break;
+
+ case RESTORE:
+ proto_tree_add_item(mifare_tree, hf_mifare_block_address, tvb, 1, 1, ENC_BIG_ENDIAN);
+ proto_tree_add_item(mifare_tree, hf_mifare_operand, tvb, 2, 4, ENC_BIG_ENDIAN);
+ col_append_sep_str(pinfo->cinfo, COL_INFO, NULL, "Restore");
+ break;
+
+ default:
+ col_append_sep_str(pinfo->cinfo, COL_INFO, NULL, "Unknown");
+ break;
+ }
+ return tvb_captured_length(tvb);
+}
+
+void
+proto_register_mifare(void)
+{
+ static hf_register_info hf[] = {
+
+ {&hf_mifare_command,
+ { "Command", "mifare.cmd", FT_UINT8, BASE_HEX,
+ VALS(hf_mifare_commands), 0x0, NULL, HFILL }},
+ {&hf_mifare_block_address,
+ { "Block Address", "mifare.block.addr", FT_UINT8, BASE_DEC,
+ NULL, 0x0, NULL, HFILL }},
+ {&hf_mifare_key_a,
+ { "Key A", "mifare.key.a", FT_UINT64, BASE_HEX,
+ NULL, 0x0, NULL, HFILL }},
+ {&hf_mifare_key_b,
+ { "Key B", "mifare.key.b", FT_UINT64, BASE_HEX,
+ NULL, 0x0, NULL, HFILL }},
+ {&hf_mifare_uid,
+ { "UID", "mifare.uid", FT_UINT32, BASE_HEX,
+ NULL, 0x0, NULL, HFILL }},
+ {&hf_mifare_operand,
+ { "Operand", "mifare.operand", FT_INT32, BASE_DEC,
+ NULL, 0x0, NULL, HFILL }},
+ {&hf_mifare_payload,
+ { "Payload", "mifare.payload", FT_BYTES, BASE_NONE,
+ NULL, 0x0, NULL, HFILL }}
+ };
+
+ static gint *ett[] = {
+ &ett_mifare
+ };
+
+ proto_mifare = proto_register_protocol("NXP MiFare", "MiFare", "mifare");
+ proto_register_field_array(proto_mifare, hf, array_length(hf));
+ proto_register_subtree_array(ett, array_length(ett));
+
+ register_dissector("mifare", dissect_mifare, proto_mifare);
+}
+
+/*
+ * Editor modelines - https://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 4
+ * tab-width: 8
+ * indent-tabs-mode: nil
+ * End:
+ *
+ * ex: set shiftwidth=4 tabstop=8 expandtab:
+ * :indentSize=4:tabSize=8:noTabs=true:
+ */
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-08 19:57:32 +0000