msft: Implement MS PnP applet to simplify card detection under Windows

Signed-off-by: Jakub Jelen <jjelen@redhat.com>

3 files changed, 124 insertions, 0 deletions

diff --git a/src/msft.c b/src/msft.c
new file mode 100644
index 0000000..e3d88e3
--- /dev/null
+++ b/src/msft.c
@@ -0,0 +1,93 @@
+/*
+ * defines the entry point for the Microsoft Plug and Play emulation. Only used
+ * by vcard_emul_type.c
+ *
+ * Copyright 2019 Red Hat, Inc.
+ *
+ * Author: Jakub Jelen <jjelen@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ * References:
+ * https://docs.microsoft.com/en-us/windows-hardware/drivers/smartcard/discovery-process
+ */
+
+#include "glib-compat.h"
+
+#include <string.h>
+#include <stdio.h>
+#include <stdbool.h>
+
+#include "msft.h"
+#include "vcard.h"
+#include "vcard_emul.h"
+#include "card_7816.h"
+
+static unsigned char msft_container_aid[] = {
+    0xa0, 0x00, 0x00, 0x03, 0x97, 0x43, 0x49, 0x44, 0x5F, 0x01, 0x00 };
+
+/* Data returned for Get Data Instruction */
+static unsigned char msft_get_data[] = {
+    0x30, 0x1D, 0x02, 0x01, 0x00, 0x16, 0x04, 0x4D,
+    0x53, 0x46, 0x54, 0x30, 0x12, 0x04, 0x10, 0xE2,
+    0x80, 0xE9, 0xD2, 0x51, 0x88, 0x87, 0x4F, 0x81,
+    0xD6, 0x4F, 0x25, 0x4E, 0x38, 0x00, 0x1D
+};
+
+
+static VCardStatus
+msft_applet_container_process_apdu(VCard *card, VCardAPDU *apdu,
+                                   VCardResponse **response)
+{
+    VCardStatus ret = VCARD_FAIL;
+    unsigned int tag;
+
+    switch (apdu->a_ins) {
+    case GP_GET_DATA:
+        /* Windows proprietary tag */
+        tag = (apdu->a_p1 & 0xff) << 8 | (apdu->a_p2 & 0xff);
+        if (tag == 0x7f68) {
+            *response = vcard_response_new(card, msft_get_data,
+                sizeof(msft_get_data), apdu->a_Le, VCARD7816_STATUS_SUCCESS);
+            ret = VCARD_DONE;
+            break;
+        }
+        *response = vcard_make_response(VCARD7816_STATUS_ERROR_DATA_NOT_FOUND);
+        ret = VCARD_DONE;
+        break;
+
+    default:
+        /* Let the ISO 7816 code to handle other APDUs */
+        ret = VCARD_NEXT;
+        break;
+    }
+    return ret;
+}
+
+
+/*
+ * Initialize the Microsoft Applet. This is the only public function in
+ * this file. All the rest are connected through function pointers.
+ */
+VCardStatus
+msft_card_init(G_GNUC_UNUSED VReader *reader, VCard *card)
+{
+    VCardApplet *applet;
+
+    /* create MS PnP container */
+    applet = vcard_new_applet(msft_applet_container_process_apdu,
+                              NULL, msft_container_aid,
+                              sizeof(msft_container_aid));
+    if (applet == NULL) {
+        goto failure;
+    }
+    vcard_add_applet(card, applet);
+
+    return VCARD_DONE;
+
+failure:
+    return VCARD_FAIL;
+}
+
+/* vim: set ts=4 sw=4 tw=0 noet expandtab: */
diff --git a/src/msft.h b/src/msft.h
new file mode 100644
index 0000000..78a9e67
--- /dev/null
+++ b/src/msft.h
@@ -0,0 +1,28 @@
+/*
+ * defines the entry point for the Microsoft Plug and Play emulation. Only used
+ * by vcard_emul_type.c
+ *
+ * Copyright 2019 Red Hat, Inc.
+ *
+ * Author: Jakub Jelen <jjelen@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
+ * See the COPYING file in the top-level directory.
+ */
+#ifndef MSFT_H
+#define MSFT_H 1
+
+#include "vcard.h"
+#include "vreader.h"
+
+#define GP_GET_DATA                           0xCA
+
+/*
+ * Initialize the Microsoft Applet. This is the only public function in
+ * this file. All the rest are connected through function pointers.
+ */
+VCardStatus
+msft_card_init(VReader *reader, VCard *card);
+
+#endif
+
diff --git a/src/vcard_emul_type.c b/src/vcard_emul_type.c
index ca7bbaa..04180b6 100644
--- a/src/vcard_emul_type.c
+++ b/src/vcard_emul_type.c
@@ -14,6 +14,7 @@
 #include "vcard_emul_type.h"
 #include "cac.h"
 #include "gp.h"
+#include "msft.h"
 #include "glib-compat.h"
 
 VCardStatus vcard_init(VReader *vreader, VCard *vcard,
@@ -33,6 +34,8 @@ VCardStatus vcard_init(VReader *vreader, VCard *vcard,
             cert, cert_len, key, cert_count);
         if (rv == VCARD_DONE)
             rv = gp_card_init(vreader, vcard);
+        if (rv == VCARD_DONE)
+            rv = msft_card_init(vreader, vcard);
         return rv;
     /* add new ones here */
     case VCARD_EMUL_PASSTHRU: