4 * Copyright (c) 2015 Samsung Electronics Co., Ltd. All rights reserved.
6 * Contact: Yong Yeon Kim <yy9875.kim@samsung.com>
8 * Licensed under the Apache License, Version 2.0 (the "License");
9 * you may not use this file except in compliance with the License.
10 * You may obtain a copy of the License at
12 * http://www.apache.org/licenses/LICENSE-2.0
14 * Unless required by applicable law or agreed to in writing, software
15 * distributed under the License is distributed on an "AS IS" BASIS,
16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17 * See the License for the specific language governing permissions and
18 * limitations under the License.
23 * This file contains Cynara integration code
25 * @file media-util-cynara.c
26 * @author Jacek Bukarewicz (j.bukarewicz@samsung.com)
34 #include <media-util-cynara.h>
35 #include <media-util-dbg.h>
36 #include <media-util-err.h>
37 #include <media-util-internal.h>
39 #include <cynara-client.h>
40 #include <cynara-session.h>
41 #include <cynara-error.h>
42 #include <cynara-creds-socket.h>
44 /* this definition is missing in glibc headers (version 2.21). It was introduced in kernel version 2.6.17 */
46 #define SCM_SECURITY 0x03
49 static cynara *_cynara = NULL;
50 static cynara_configuration *_p_conf = NULL;
51 G_LOCK_DEFINE_STATIC(cynara_mutex);
53 static void ms_cynara_dbg_err(const char *prefix, int error_code)
55 char error_buffer[256];
57 error_buffer[0] = '\0';
59 err = cynara_strerror(error_code, error_buffer, sizeof(error_buffer));
60 if (err == CYNARA_API_SUCCESS)
61 MSAPI_DBG_ERR("%s: %s", prefix, error_buffer);
63 MSAPI_DBG_ERR("%s: error code %i", prefix, error_code);
66 int ms_cynara_initialize(void)
70 ret = cynara_configuration_create(&_p_conf);
71 if (ret != CYNARA_API_SUCCESS) {
72 ms_cynara_dbg_err("cynara_configuration_create", ret);
73 return MS_MEDIA_ERR_INTERNAL;
75 ret = cynara_configuration_set_cache_size(_p_conf, 100);
76 if (ret != CYNARA_API_SUCCESS) {
77 ms_cynara_dbg_err("cynara_configuration_set_cache_size", ret);
78 return MS_MEDIA_ERR_INTERNAL;
80 ret = cynara_initialize(&_cynara, _p_conf);
81 if (ret != CYNARA_API_SUCCESS) {
82 ms_cynara_dbg_err("cynara_initialize", ret);
83 return MS_MEDIA_ERR_INTERNAL;
86 cynara_configuration_destroy(_p_conf);
88 return MS_MEDIA_ERR_NONE;
91 void ms_cynara_finish(void)
93 cynara_finish(_cynara);
97 int ms_cynara_receive_untrusted_message(int sockfd, ms_comm_msg_s *recv_msg, ms_peer_credentials *credentials)
100 int recv_msg_size = 0;
102 if (!recv_msg || !credentials)
103 return MS_MEDIA_ERR_INVALID_PARAMETER;
105 if ((recv_msg_size = read(sockfd, recv_msg, sizeof(ms_comm_msg_s))) < 0) {
106 if (errno == EWOULDBLOCK) {
107 MSAPI_DBG_ERR("Timeout. Can't try any more");
108 return MS_MEDIA_ERR_SOCKET_RECEIVE_TIMEOUT;
110 MSAPI_DBG_ERR("recv failed");
111 return MS_MEDIA_ERR_SOCKET_RECEIVE;
115 MSAPI_DBG_SLOG("receive msg from [%d] %d, %s", recv_msg->pid, recv_msg->msg_type, recv_msg->msg);
117 if (strlen(recv_msg->msg) == 0 || strlen(recv_msg->msg) >= MAX_MSG_SIZE) {
118 MSAPI_DBG_ERR("IPC message is wrong. message size is %d", strlen(recv_msg->msg));
119 return MS_MEDIA_ERR_INVALID_IPC_MESSAGE;
122 ret = cynara_creds_socket_get_pid(sockfd, &(credentials->pid));
123 MSAPI_RETVM_IF(ret != 0, MS_MEDIA_ERR_INTERNAL, "[CYNARA]Failed to get pid");
125 ret = cynara_creds_socket_get_user(sockfd, USER_METHOD_UID, &(credentials->uid));
126 MSAPI_RETVM_IF(ret != 0, MS_MEDIA_ERR_INTERNAL, "[CYNARA]Failed to get uid");
128 ret = cynara_creds_socket_get_client(sockfd, CLIENT_METHOD_SMACK, &(credentials->smack));
129 MSAPI_RETVM_IF(ret != 0, MS_MEDIA_ERR_INTERNAL, "[CYNARA]Failed to get smack");
131 // MSAPI_DBG_ERR("cynara_creds_info : P[%d]U[%s]S[%s]", credentials->pid, credentials->uid, credentials->smack);
133 return MS_MEDIA_ERR_NONE;
136 int ms_cynara_receive_untrusted_message_thumb(int sockfd, thumbMsg *recv_msg, ms_peer_credentials *credentials)
140 int recv_msg_size = 0;
141 unsigned char *buf = NULL;
143 if (!recv_msg || !credentials)
144 return MS_MEDIA_ERR_INVALID_PARAMETER;
146 header_size = sizeof(thumbMsg) - sizeof(unsigned char *);
147 MS_MALLOC(buf, header_size);
149 if ((recv_msg_size = recv(sockfd, buf, header_size, 0)) < 0) {
150 if (errno == EWOULDBLOCK) {
151 MSAPI_DBG_ERR("Timeout. Can't try any more");
153 return MS_MEDIA_ERR_SOCKET_RECEIVE_TIMEOUT;
155 MSAPI_DBG_ERR("recv failed");
157 return MS_MEDIA_ERR_SOCKET_RECEIVE;
161 memcpy(recv_msg, buf, header_size);
164 ret = cynara_creds_socket_get_pid(sockfd, &(credentials->pid));
165 MSAPI_RETVM_IF(ret != 0, MS_MEDIA_ERR_INTERNAL, "[CYNARA]Failed to get pid");
167 ret = cynara_creds_socket_get_user(sockfd, USER_METHOD_UID, &(credentials->uid));
168 MSAPI_RETVM_IF(ret != 0, MS_MEDIA_ERR_INTERNAL, "[CYNARA]Failed to get uid");
170 ret = cynara_creds_socket_get_client(sockfd, CLIENT_METHOD_SMACK, &(credentials->smack));
171 MSAPI_RETVM_IF(ret != 0, MS_MEDIA_ERR_INTERNAL, "[CYNARA]Failed to get smack");
173 // MSAPI_DBG_ERR("cynara_creds_info : P[%d]U[%s]S[%s]", credentials->pid, credentials->uid, credentials->smack);
175 return MS_MEDIA_ERR_NONE;
178 int ms_cynara_check(const ms_peer_credentials *creds, const char *privilege)
183 if (!creds || !privilege)
184 return MS_MEDIA_ERR_INVALID_PARAMETER;
186 session = cynara_session_from_pid(creds->pid);
187 MSAPI_RETVM_IF(session == NULL, MS_MEDIA_ERR_INTERNAL, "cynara_session_from_pid failed");
189 G_LOCK(cynara_mutex);
190 result = cynara_check(_cynara, creds->smack, session, creds->uid, privilege);
191 G_UNLOCK(cynara_mutex);
193 if (result != CYNARA_API_ACCESS_ALLOWED)
194 ms_cynara_dbg_err("cynara_check", result);
196 MS_SAFE_FREE(session);
197 return result == CYNARA_API_ACCESS_ALLOWED ? MS_MEDIA_ERR_NONE : MS_MEDIA_ERR_PERMISSION_DENIED;
200 int ms_cynara_enable_credentials_passing(int fd)
202 const int optval = 1;
205 err = setsockopt(fd, SOL_SOCKET, SO_PASSSEC, &optval, sizeof(optval));
206 MSAPI_RETVM_IF(err != 0, MS_MEDIA_ERR_SOCKET_INTERNAL, "Failed to set SO_PASSSEC socket option");
208 err = setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &optval, sizeof(optval));
209 MSAPI_RETVM_IF(err != 0, MS_MEDIA_ERR_SOCKET_INTERNAL, "Failed to set SO_PASSCRED socket option");
211 return MS_MEDIA_ERR_NONE;