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fuzz/pcsc.c

@@ -0,0 +1,153 @@
+/*
+ * Copyright (c) 2022 Yubico AB. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <assert.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <winscard.h>
+
+#include "mutator_aux.h"
+
+static const struct blob *reader_list;
+static int (*xread)(void *, u_char *, size_t, int);
+static int (*xwrite)(void *, const u_char *, size_t);
+static void (*xconsume)(const void *, size_t);
+
+LONG __wrap_SCardEstablishContext(DWORD, LPCVOID, LPCVOID, LPSCARDCONTEXT);
+LONG __wrap_SCardListReaders(SCARDCONTEXT, LPCSTR, LPSTR, LPDWORD);
+LONG __wrap_SCardReleaseContext(SCARDCONTEXT);
+LONG __wrap_SCardConnect(SCARDCONTEXT, LPCSTR, DWORD, DWORD, LPSCARDHANDLE,
+    LPDWORD);
+LONG __wrap_SCardDisconnect(SCARDHANDLE, DWORD);
+LONG __wrap_SCardTransmit(SCARDHANDLE, const SCARD_IO_REQUEST *, LPCBYTE,
+    DWORD, SCARD_IO_REQUEST *, LPBYTE, LPDWORD);
+
+LONG
+__wrap_SCardEstablishContext(DWORD dwScope, LPCVOID pvReserved1,
+    LPCVOID pvReserved2, LPSCARDCONTEXT phContext)
+{
+	assert(dwScope == SCARD_SCOPE_SYSTEM);
+	assert(pvReserved1 == NULL);
+	assert(pvReserved2 == NULL);
+
+	*phContext = 1;
+
+	if (uniform_random(400) < 1)
+		return SCARD_E_NO_SERVICE;
+	if (uniform_random(400) < 1)
+		return SCARD_E_NO_SMARTCARD;
+	if (uniform_random(400) < 1)
+		return SCARD_E_NO_MEMORY;
+	if (uniform_random(400) < 1)
+		*phContext = 0;
+
+	return SCARD_S_SUCCESS;
+}
+
+LONG
+__wrap_SCardListReaders(SCARDCONTEXT hContext, LPCSTR mszGroups,
+    LPSTR mszReaders, LPDWORD pcchReaders)
+{
+	assert(hContext == 1);
+	assert(mszGroups == NULL);
+	assert(mszReaders != NULL);
+	assert(pcchReaders != 0);
+
+	if (reader_list == NULL || uniform_random(400) < 1)
+		return SCARD_E_NO_READERS_AVAILABLE;
+	if (uniform_random(400) < 1)
+		return SCARD_E_NO_MEMORY;
+
+	memcpy(mszReaders, reader_list->body, reader_list->len > *pcchReaders ?
+	    *pcchReaders : reader_list->len);
+	*pcchReaders = (DWORD)reader_list->len; /* on purpose */
+
+	return SCARD_S_SUCCESS;
+}
+
+LONG
+__wrap_SCardReleaseContext(SCARDCONTEXT hContext)
+{
+	assert(hContext == 1);
+
+	return SCARD_S_SUCCESS;
+}
+
+LONG
+__wrap_SCardConnect(SCARDCONTEXT hContext, LPCSTR szReader, DWORD dwShareMode,
+    DWORD dwPreferredProtocols, LPSCARDHANDLE phCard, LPDWORD pdwActiveProtocol)
+{
+	uint32_t r;
+
+	assert(hContext == 1);
+	xconsume(szReader, strlen(szReader) + 1);
+	assert(dwShareMode == SCARD_SHARE_SHARED);
+	assert(dwPreferredProtocols == SCARD_PROTOCOL_ANY);
+	assert(phCard != NULL);
+	assert(pdwActiveProtocol != NULL);
+
+	if ((r = uniform_random(400)) < 1)
+		return SCARD_E_UNEXPECTED;
+
+	*phCard = 1;
+	*pdwActiveProtocol = (r & 1) ? SCARD_PROTOCOL_T0 : SCARD_PROTOCOL_T1;
+
+	if (uniform_random(400) < 1)
+		*pdwActiveProtocol = SCARD_PROTOCOL_RAW;
+
+	return SCARD_S_SUCCESS;
+}
+
+LONG
+__wrap_SCardDisconnect(SCARDHANDLE hCard, DWORD dwDisposition)
+{
+	assert(hCard == 1);
+	assert(dwDisposition == SCARD_LEAVE_CARD);
+
+	return SCARD_S_SUCCESS;
+}
+
+extern void consume(const void *body, size_t len);
+
+LONG
+__wrap_SCardTransmit(SCARDHANDLE hCard, const SCARD_IO_REQUEST *pioSendPci,
+    LPCBYTE pbSendBuffer, DWORD cbSendLength, SCARD_IO_REQUEST *pioRecvPci,
+    LPBYTE pbRecvBuffer, LPDWORD pcbRecvLength)
+{
+	void *ioh = (void *)NFC_DEV_HANDLE;
+	int n;
+
+	assert(hCard == 1);
+	xconsume(pioSendPci, sizeof(*pioSendPci));
+	xwrite(ioh, pbSendBuffer, cbSendLength);
+	assert(pioRecvPci == NULL);
+
+	if (uniform_random(400) < 1 ||
+	    (n = xread(ioh, pbRecvBuffer, *pcbRecvLength, -1)) == -1)
+		return SCARD_E_UNEXPECTED;
+	*pcbRecvLength = (DWORD)n;
+
+	return SCARD_S_SUCCESS;
+}
+
+void
+set_pcsc_parameters(const struct blob *reader_list_ptr)
+{
+	reader_list = reader_list_ptr;
+}
+
+void
+set_pcsc_io_functions(int (*read_f)(void *, u_char *, size_t, int),
+    int (*write_f)(void *, const u_char *, size_t),
+    void (*consume_f)(const void *, size_t))
+{
+	xread = read_f;
+	xwrite = write_f;
+	xconsume = consume_f;
+}