1 /*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #define LOG_TAG "TrustyKeymaster"
18
19 // TODO: make this generic in libtrusty
20
21 #include <errno.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <unistd.h>
25
26 #include <log/log.h>
27 #include <trusty/tipc.h>
28
29 #include "trusty_keymaster_ipc.h"
30 #include "keymaster_ipc.h"
31
32 #define TRUSTY_DEVICE_NAME "/dev/trusty-ipc-dev0"
33
34 static int handle_ = 0;
35
trusty_keymaster_connect()36 int trusty_keymaster_connect() {
37 int rc = tipc_connect(TRUSTY_DEVICE_NAME, KEYMASTER_PORT);
38 if (rc < 0) {
39 return rc;
40 }
41
42 handle_ = rc;
43 return 0;
44 }
45
trusty_keymaster_call(uint32_t cmd,void * in,uint32_t in_size,uint8_t * out,uint32_t * out_size)46 int trusty_keymaster_call(uint32_t cmd, void *in, uint32_t in_size, uint8_t *out,
47 uint32_t *out_size) {
48 if (handle_ == 0) {
49 ALOGE("not connected\n");
50 return -EINVAL;
51 }
52
53 size_t msg_size = in_size + sizeof(struct keymaster_message);
54 struct keymaster_message *msg = malloc(msg_size);
55 msg->cmd = cmd;
56 memcpy(msg->payload, in, in_size);
57
58 ssize_t rc = write(handle_, msg, msg_size);
59 free(msg);
60
61 if (rc < 0) {
62 ALOGE("failed to send cmd (%d) to %s: %s\n", cmd,
63 KEYMASTER_PORT, strerror(errno));
64 return -errno;
65 }
66
67 rc = read(handle_, out, *out_size);
68 if (rc < 0) {
69 ALOGE("failed to retrieve response for cmd (%d) to %s: %s\n",
70 cmd, KEYMASTER_PORT, strerror(errno));
71 return -errno;
72 }
73
74 if ((size_t) rc < sizeof(struct keymaster_message)) {
75 ALOGE("invalid response size (%d)\n", (int) rc);
76 return -EINVAL;
77 }
78
79 msg = (struct keymaster_message *) out;
80
81 if ((cmd | KEYMASTER_RESP_BIT) != msg->cmd) {
82 ALOGE("invalid command (%d)", msg->cmd);
83 return -EINVAL;
84 }
85
86 *out_size = ((size_t) rc) - sizeof(struct keymaster_message);
87 return rc;
88 }
89
trusty_keymaster_disconnect()90 void trusty_keymaster_disconnect() {
91 if (handle_ != 0) {
92 tipc_close(handle_);
93 }
94 }
95
96