Add to check pid from __accept_candidate_process()

Check whether different cpc and received socket pid,
when accept client socket.
If they are different, It is invalid accept.

Change-Id: I2f2a3e9896fc07fc6ee77d4ca77d47042fa6d958
Signed-off-by: Changgyu Choi <changyu.choi@samsung.com>

2 files changed, 29 insertions, 10 deletions

diff --git a/src/common/src/launchpad_common.c b/src/common/src/launchpad_common.c
index 1521634..05d8bef 100644
--- a/src/common/src/launchpad_common.c
+++ b/src/common/src/launchpad_common.c
@@ -679,7 +679,7 @@ int _connect_to_launchpad(int type, int id)
 	send_ret = send(fd, &client_pid, sizeof(client_pid), MSG_NOSIGNAL);
 	_D("send(%d) : %d", client_pid, send_ret);
 	if (send_ret == -1) {
-		_E("send error");
+		_E("send error(%d)", errno);
 		close(fd);
 		return -1;
 	}
diff --git a/src/launchpad/src/launchpad.c b/src/launchpad/src/launchpad.c
index 9db8b9d..c665796 100644
--- a/src/launchpad/src/launchpad.c
+++ b/src/launchpad/src/launchpad.c
@@ -591,11 +591,13 @@ error:
 }
 
 static int __accept_candidate_process(int server_fd, int *out_client_fd,
-		int *out_client_pid)
+		int *out_client_pid, int cpc_pid)
 {
 	int client_fd = -1;
-	int client_pid = 0;
-	int recv_ret = 0;
+	int recv_pid = 0;
+	int ret;
+	socklen_t len;
+	struct ucred cred = {};
 
 	if (server_fd == -1 || out_client_fd == NULL ||
 			out_client_pid == NULL) {
@@ -614,15 +616,29 @@ static int __accept_candidate_process(int server_fd, int *out_client_fd,
 		goto error;
 	}
 
-	recv_ret = recv(client_fd, &client_pid, sizeof(client_pid),
-			MSG_WAITALL);
-	if (recv_ret == -1) {
+	ret = recv(client_fd, &recv_pid, sizeof(recv_pid), MSG_WAITALL);
+	if (ret == -1) {
 		_E("recv error!");
 		goto error;
 	}
 
+	len = sizeof(cred);
+	ret = getsockopt(client_fd, SOL_SOCKET, SO_PEERCRED, &cred, &len);
+	if (ret < 0) {
+		_E("getsockopt error");
+		goto error;
+	}
+
+	if (cred.pid != cpc_pid) {
+		_E("Invalid accept. pid(%d)", cred.pid);
+		goto error;
+	}
+
+	if (cred.pid != recv_pid)
+		_W("Not equal recv and real pid");
+
 	*out_client_fd = client_fd;
-	*out_client_pid = client_pid;
+	*out_client_pid = cred.pid;
 
 	return *out_client_fd;
 
@@ -1432,7 +1448,8 @@ static bool __handle_loader_event(int fd, io_condition_e cond, void *data)
 		return false;
 
 	if (!cpc->prepared) {
-		ret = __accept_candidate_process(fd, &client_fd, &client_pid);
+		ret = __accept_candidate_process(fd, &client_fd, &client_pid,
+					cpc->pid);
 		if (ret >= 0) {
 			/* for hydra need to set pid to pid of non-hydra candidate, */
 			/* which is connecting now */
@@ -1470,7 +1487,8 @@ static bool __handle_hydra_event(int fd, io_condition_e cond, void *data)
 		return false;
 
 	if (!cpc->prepared) {
-		ret = __accept_candidate_process(fd, &client_fd, &client_pid);
+		ret = __accept_candidate_process(fd, &client_fd, &client_pid,
+					cpc->pid);
 		if (ret >= 0) {
 			cpc->hydra_fd = client_fd;
 
@@ -1536,6 +1554,7 @@ static bool __handle_label_monitor(int fd, io_condition_e cond, void *data)
 		return false;
 	}
 
+	_D("fd(%d) condition(%d)", fd, cond);
 	_log_print("[LABEL]", "fd(%d), condition(%d)", fd, cond);
 	security_manager_app_labels_monitor_process(label_monitor);