[PATCH] sanlk-resetd: Allow only privileged user to modify configuration

[Nir Soffer]

Previously sanlk-resetd socket used an abstract namespace, allowing any
user to configure the daemon.  Now we use a real filename so accessing
the socket is possible only for privileged user.

Signed-off-by: Nir Soffer <nsoffer(a)redhat.com&gt;
---
 reset/sanlk_reset.c  |  2 +-
 reset/sanlk_reset.h  |  8 +++++---
 reset/sanlk_resetd.c | 15 ++++++++++++++-
 3 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/reset/sanlk_reset.c b/reset/sanlk_reset.c
index ddd7af2..34b66af 100644
--- a/reset/sanlk_reset.c
+++ b/reset/sanlk_reset.c
@@ -439,7 +439,7 @@ static int update_local_daemon(char *cmd)
 
 		rv = sendto(s, buf, UPDATE_SIZE, 0, (struct sockaddr *)&update_addr,
update_addrlen);
 		if (rv < 0) {
-			printf("Failed to update local sanlk-resetd %d\n", rv);
+			printf("Failed to update local sanlk-resetd: %s\n", strerror(errno));
 			return rv;
 		} else {
 			printf("Updated %s %s\n", cmd, ls_names[i]);
diff --git a/reset/sanlk_reset.h b/reset/sanlk_reset.h
index f386301..8c92c8e 100644
--- a/reset/sanlk_reset.h
+++ b/reset/sanlk_reset.h
@@ -14,7 +14,9 @@
 #define EVENT_REBOOT             4
 #define EVENT_REBOOTING          8
 
-#define SANLK_RESETD_PATH "sanlk-resetd"
+#define SANLK_RESETD_RUNDIR "/var/run/sanlk-resetd"
+#define SANLK_RESETD_SOCKET SANLK_RESETD_RUNDIR "/sanlk-resetd.sock"
+#define SANLK_RESETD_SOCKET_MODE (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP)
 
 #define UPDATE_SIZE 256  /* sendmsg size on unix socket */
 
@@ -28,8 +30,8 @@ static inline int setup_resetd_socket(void)
 
 	memset(&update_addr, 0, sizeof(update_addr));
 	update_addr.sun_family = AF_LOCAL;
-	strcpy(&update_addr.sun_path[1], SANLK_RESETD_PATH);
-	update_addrlen = sizeof(sa_family_t) + strlen(update_addr.sun_path+1) + 1;
+	strcpy(update_addr.sun_path, SANLK_RESETD_SOCKET);
+	update_addrlen = sizeof(sa_family_t) + strlen(update_addr.sun_path) + 1;
 
 	return s;
 }
diff --git a/reset/sanlk_resetd.c b/reset/sanlk_resetd.c
index 0c0c0f8..1f00144 100644
--- a/reset/sanlk_resetd.c
+++ b/reset/sanlk_resetd.c
@@ -430,14 +430,27 @@ static int setup_update(void)
 {
 	int s, rv;
 
+	rv = mkdir(SANLK_RESETD_RUNDIR, 0755);
+	if (rv < 0 && errno != EEXIST)
+		return rv;
+
 	s = setup_resetd_socket();
 
+	unlink(update_addr.sun_path);
 	rv = bind(s, (struct sockaddr *) &update_addr, update_addrlen);
 	if (rv < 0)
-		return rv;
+		goto fail_close;
+
+	rv = chmod(update_addr.sun_path, SANLK_RESETD_SOCKET_MODE);
+	if (rv < 0)
+		goto fail_close;
 
 	update_fd = s;
 	return 0;
+
+fail_close:
+	close(s);
+	return -1;
 }
 
 static void process_update(int fd)
-- 
1.8.3.1