1 files changed, 172 insertions, 0 deletions
diff --git a/lib/base/etpm.cpp b/lib/base/etpm.cpp
new file mode 100644
index 00000000..9a443e0a
--- /dev/null
+++ b/lib/base/etpm.cpp
@@ -0,0 +1,172 @@
+#include <sys/socket.h>
+#include <fcntl.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/un.h>
+#include <unistd.h>
+#include <openssl/bn.h>
+#include <openssl/sha.h>
+#include <lib/base/eerror.h>
+
+#include "etpm.h"
+
+eTPM::eTPM()
+{
+	struct sockaddr_un addr;
+	unsigned char buf[8];
+	unsigned int tag;
+	size_t len;
+	unsigned char *val;
+
+	level2_cert_read = level3_cert_read = false;
+
+	addr.sun_family = AF_UNIX;
+	strcpy(addr.sun_path, TPMD_SOCKET);
+
+	fd = socket(PF_UNIX, SOCK_STREAM, 0);
+	if (fd < 0)
+	{
+		eDebug("[eTPM] socket error");
+		return;
+	}
+
+	if (connect(fd, (const struct sockaddr *)&addr, SUN_LEN(&addr)) < 0)
+	{
+		eDebug("[eTPM] connect error");
+		return;
+	}
+
+	buf[0] = TPMD_DT_LEVEL2_CERT;
+	buf[1] = TPMD_DT_LEVEL3_CERT;
+	if (!send_cmd(TPMD_CMD_GET_DATA, buf, 2))
+	{
+		return;
+	}
+
+	val = (unsigned char*)recv_cmd(&tag, &len);
+	if (val == NULL)
+	{
+		return;
+	}
+
+	parse_data(val, len);
+	free(val);
+}
+
+eTPM::~eTPM()
+{
+
+}
+
+bool eTPM::send_cmd(enum tpmd_cmd cmd, const void *data, size_t len)
+{
+	unsigned char buf[len + 4];
+
+	buf[0] = (cmd >> 8) & 0xff;
+	buf[1] = (cmd >> 0) & 0xff;
+	buf[2] = (len >> 8) & 0xff;
+	buf[3] = (len >> 0) & 0xff;
+	memcpy(&buf[4], data, len);
+
+	if (write(fd, buf, sizeof(buf)) != (ssize_t)sizeof(buf))
+	{
+		fprintf(stderr, "%s: incomplete write\n", __func__);
+		return false;
+	}
+
+	return true;
+}
+
+void* eTPM::recv_cmd(unsigned int *tag, size_t *len)
+{
+	unsigned char buf[4];
+	void *val;
+
+	if (read(fd, buf, 4) != 4)
+	{
+		fprintf(stderr, "%s: incomplete read\n", __func__);
+		return NULL;
+	}
+
+	*tag = (buf[0] << 8) | buf[1];
+	*len = (buf[2] << 8) | buf[3];
+
+	val = malloc(*len);
+	if (val == NULL)
+		return NULL;
+
+	ssize_t rd = read(fd, val, *len);
+	if (rd < 0)
+	{
+		perror("eTPM::recv_cmd read");
+		free(val);
+	}
+        else if ((size_t)rd != *len) {
+		fprintf(stderr, "%s: incomplete read\n", __func__);
+		free(val);
+		return NULL;
+	}
+
+	return val;
+}
+
+void eTPM::parse_data(const unsigned char *data, size_t datalen)
+{
+	unsigned int i;
+	unsigned int tag;
+	unsigned int len;
+	const unsigned char *val;
+
+	for (i = 0; i < datalen; i += len) {
+		tag = data[i++];
+		len = data[i++];
+		val = &data[i];
+
+		switch (tag) {
+		case TPMD_DT_LEVEL2_CERT:
+			if (len != 210)
+				break;
+			memcpy(level2_cert, val, 210);
+			level2_cert_read = true;
+			break;
+		case TPMD_DT_LEVEL3_CERT:
+			if (len != 210)
+				break;
+			memcpy(level3_cert, val, 210);
+			level3_cert_read = true;
+			break;
+		}
+	}
+}
+
+std::string eTPM::getCert(cert_type type)
+{
+	if (type == TPMD_DT_LEVEL2_CERT && level2_cert_read)
+		return std::string((char*)level2_cert, 210);
+	else if (type == TPMD_DT_LEVEL3_CERT && level3_cert_read)
+		return std::string((char*)level3_cert, 210);
+	return "";
+}
+
+std::string eTPM::challenge(std::string rnd)
+{
+	if (rnd.length() == 8)
+	{
+		if (!send_cmd(TPMD_CMD_COMPUTE_SIGNATURE, rnd.c_str(), 8))
+			return "";
+
+		unsigned int tag;
+		size_t len;
+		unsigned char *val = (unsigned char*)recv_cmd(&tag, &len);
+
+		if (tag != TPMD_CMD_COMPUTE_SIGNATURE)
+			return "";
+
+		std::string ret((char*)val, len);
+		free(val);
+		return ret;
+	}
+	return "";
+}