frontend: Get the username of the remote peer from a UNIX socket.

[sysdb.git] / src / frontend / session.c

diff --git a/src/frontend/session.c b/src/frontend/session.c
index b0fc7803e2a0e23ab53a05cc6a1c694c4251b824..ab45cdd17c30cb154a7cf051cf940ba11e47e4b0 100644 (file)
--- a/src/frontend/session.c
+++ b/src/frontend/session.c
@@ -42,26 +42,33 @@
 int
 sdb_fe_session_start(sdb_conn_t *conn)
 {
-       const char *username;
+       char username[sdb_strbuf_len(conn->buf) + 1];
+       const char *tmp;
 
-       if ((! conn) || (conn->username))
+       if ((! conn) || (conn->cmd != SDB_CONNECTION_STARTUP))
                return -1;
 
-       if (conn->cmd != SDB_CONNECTION_STARTUP)
-               return -1;
-
-       username = sdb_strbuf_string(conn->buf);
-       if ((! username) || (! conn->cmd_len) || (! *username)) {
+       tmp = sdb_strbuf_string(conn->buf);
+       if ((! tmp) || (! conn->cmd_len) || (! *tmp)) {
                sdb_strbuf_sprintf(conn->errbuf, "Invalid empty username");
                return -1;
        }
+       strncpy(username, tmp, conn->cmd_len);
+       username[conn->cmd_len] = '\0';
 
-       /* XXX: for now, simply accept all connections */
-       conn->username = strndup(username, conn->cmd_len);
        if (! conn->username) {
-               sdb_strbuf_sprintf(conn->errbuf, "Authentication failed");
+               /* We couldn't determine the remote peer when setting up the
+                * connection; TODO: add support for password authentication */
+               sdb_strbuf_sprintf(conn->errbuf, "Password authentication "
+                               "not supported");
                return -1;
        }
+       if (strcmp(conn->username, username)) {
+               sdb_strbuf_sprintf(conn->errbuf, "%s cannot act on behalf of %s",
+                               conn->username, username);
+               return -1;
+       }
+
        sdb_connection_send(conn, SDB_CONNECTION_OK, 0, NULL);
        conn->ready = 1;
        return 0;