blob: ebbb38ff201e01d1dd4432a463a3d09f8f9162f6 [file] [log] [blame]
/*
* Copyright (C) 2016 The Android Open Source Project
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <trusty/avb.h>
#include <trusty/rpmb.h>
#include <trusty/trusty_ipc.h>
#include <trusty/util.h>
#define LOCAL_LOG 0
static bool initialized;
static int avb_tipc_version = 1;
static struct trusty_ipc_chan avb_chan;
static int avb_send_request(struct avb_message *msg, void *req, size_t req_len)
{
struct trusty_ipc_iovec req_iovs[2] = {
{ .base = msg, .len = sizeof(*msg) },
{ .base = req, .len = req_len },
};
return trusty_ipc_send(&avb_chan, req_iovs, req ? 2 : 1, true);
}
static int avb_read_response(struct avb_message *msg, uint32_t cmd, void *resp,
size_t resp_len)
{
int rc;
struct trusty_ipc_iovec resp_iovs[2] = {
{ .base = msg, .len = sizeof(*msg) },
{ .base = resp, .len = resp_len },
};
rc = trusty_ipc_recv(&avb_chan, resp_iovs, resp ? 2 : 1, true);
if (rc < 0) {
trusty_error("failed (%d) to recv response\n", rc);
return rc;
}
if (msg->cmd != (cmd | AVB_RESP_BIT)) {
trusty_error("malformed response\n");
return TRUSTY_ERR_GENERIC;
}
/* return payload size */
return rc - sizeof(*msg);
}
/*
* Convenience function to send a request to the AVB service and read the
* response.
*
* @cmd: the command
* @req: the request buffer
* @req_size: size of the request buffer
* @resp: the response buffer
* @resp_size_p: pointer to the size of the response buffer. changed to the
actual size of the response read from the secure side
* @handle_rpmb: true if the request is expected to invoke RPMB callbacks
*/
static int avb_do_tipc(uint32_t cmd, void *req, uint32_t req_size, void *resp,
uint32_t *resp_size_p, bool handle_rpmb)
{
int rc;
struct avb_message msg = { .cmd = cmd };
if (!initialized && cmd != AVB_GET_VERSION) {
trusty_error("%s: AVB TIPC client not initialized\n", __func__);
return TRUSTY_ERR_GENERIC;
}
rc = avb_send_request(&msg, req, req_size);
if (rc < 0) {
trusty_error("%s: failed (%d) to send AVB request\n", __func__, rc);
return rc;
}
if (handle_rpmb) {
/* handle any incoming RPMB requests */
rc = rpmb_storage_proxy_poll();
if (rc < 0) {
trusty_error("%s: failed (%d) to get RPMB requests\n", __func__,
rc);
return rc;
}
}
uint32_t resp_size = resp_size_p ? *resp_size_p : 0;
rc = avb_read_response(&msg, cmd, resp, resp_size);
if (rc < 0) {
trusty_error("%s: failed (%d) to read AVB response\n", __func__, rc);
return rc;
}
/* change response size to actual response size */
if (resp_size_p && rc != *resp_size_p) {
*resp_size_p = rc;
}
if (msg.result != AVB_ERROR_NONE) {
trusty_error("%s: AVB service returned error (%d)\n", __func__,
msg.result);
return TRUSTY_ERR_GENERIC;
}
return TRUSTY_ERR_NONE;
}
static int avb_get_version(uint32_t *version)
{
int rc;
struct avb_get_version_resp resp;
uint32_t resp_size = sizeof(resp);
rc = avb_do_tipc(AVB_GET_VERSION, NULL, 0, &resp, &resp_size, false);
*version = resp.version;
return rc;
}
int avb_tipc_init(struct trusty_ipc_dev *dev)
{
int rc;
uint32_t version = 0;
trusty_assert(dev);
trusty_assert(!initialized);
trusty_ipc_chan_init(&avb_chan, dev);
trusty_debug("Connecting to AVB service\n");
/* connect to AVB service and wait for connect to complete */
rc = trusty_ipc_connect(&avb_chan, AVB_PORT, true);
if (rc < 0) {
trusty_error("failed (%d) to connect to '%s'\n", rc, AVB_PORT);
return rc;
}
/* check for version mismatch */
rc = avb_get_version(&version);
if (rc != 0) {
trusty_error("Error getting version");
return TRUSTY_ERR_GENERIC;
}
if (version != avb_tipc_version) {
trusty_error("AVB TIPC version mismatch. Expected %u, received %u\n",
avb_tipc_version, version);
return TRUSTY_ERR_GENERIC;
}
/* mark as initialized */
initialized = true;
return TRUSTY_ERR_NONE;
}
void avb_tipc_shutdown(struct trusty_ipc_dev *dev)
{
if (!initialized)
return; /* nothing to do */
/* close channel */
trusty_ipc_close(&avb_chan);
initialized = false;
}
int trusty_read_rollback_index(uint32_t slot, uint64_t *value)
{
int rc;
struct avb_rollback_req req = { .slot = slot, .value = 0 };
struct avb_rollback_resp resp;
uint32_t resp_size = sizeof(resp);
rc = avb_do_tipc(READ_ROLLBACK_INDEX, &req, sizeof(req), &resp,
&resp_size, true);
*value = resp.value;
return rc;
}
int trusty_write_rollback_index(uint32_t slot, uint64_t value)
{
int rc;
struct avb_rollback_req req = { .slot = slot, .value = value };
struct avb_rollback_resp resp;
uint32_t resp_size = sizeof(resp);
rc = avb_do_tipc(WRITE_ROLLBACK_INDEX, &req, sizeof(req), &resp,
&resp_size, true);
return rc;
}
int trusty_read_permanent_attributes(uint8_t *attributes, uint32_t size)
{
uint8_t resp_buf[AVB_MAX_BUFFER_LENGTH];
uint32_t resp_size = AVB_MAX_BUFFER_LENGTH;
int rc = avb_do_tipc(READ_PERMANENT_ATTRIBUTES, NULL, 0, resp_buf,
&resp_size, true);
if (rc != 0) {
return rc;
}
/* ensure caller passed size matches size returned by Trusty */
if (size != resp_size) {
return TRUSTY_ERR_INVALID_ARGS;
}
trusty_memcpy(attributes, resp_buf, resp_size);
return rc;
}
int trusty_write_permanent_attributes(uint8_t *attributes, uint32_t size)
{
return avb_do_tipc(WRITE_PERMANENT_ATTRIBUTES, attributes, size, NULL, NULL,
true);
}
int trusty_read_lock_state(uint8_t *lock_state)
{
uint32_t resp_size = sizeof(*lock_state);
return avb_do_tipc(READ_LOCK_STATE, NULL, 0, lock_state,
&resp_size, true);
}
int trusty_write_lock_state(uint8_t lock_state)
{
return avb_do_tipc(WRITE_LOCK_STATE, &lock_state, sizeof(lock_state), NULL,
NULL, true);
}
int trusty_lock_boot_state(void)
{
return avb_do_tipc(LOCK_BOOT_STATE, NULL, 0, NULL, NULL, false);
}