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#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/etpm.h>
DEFINE_REF(eTPM);
eTPM::eTPM()
{
struct sockaddr_un addr;
unsigned char buf[8];
unsigned int tag, 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, unsigned int 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, unsigned int *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;
if (read(fd, val, *len) != (ssize_t)*len) {
fprintf(stderr, "%s: incomplete read\n", __func__);
free(val);
return NULL;
}
return val;
}
void eTPM::parse_data(const unsigned char *data, unsigned int 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;
}
}
}
PyObject *eTPM::getCert(cert_type type)
{
if (type == TPMD_DT_LEVEL2_CERT && level2_cert_read)
return PyBuffer_FromMemory(level2_cert, 210);
else if (type == TPMD_DT_LEVEL3_CERT && level3_cert_read)
return PyBuffer_FromMemory(level3_cert, 210);
return Py_None;
}
PyObject *eTPM::challenge(PyObject* rnd)
{
if (PyString_Check(rnd) && PyString_Size(rnd) == 8)
{
char* buf = PyString_AsString(rnd);
if (!send_cmd(TPMD_CMD_COMPUTE_SIGNATURE, buf, 8))
return Py_None;
unsigned int tag, len;
unsigned char *val = (unsigned char*)recv_cmd(&tag, &len);
if (tag != TPMD_CMD_COMPUTE_SIGNATURE)
return Py_None;
return PyBuffer_FromMemory(val, len);
}
else
return Py_None;
}
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