--- /dev/null
+/*
+ * Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+/** @file
+ *
+ * Encrypted syslog protocol
+ *
+ */
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <byteswap.h>
+#include <ipxe/xfer.h>
+#include <ipxe/open.h>
+#include <ipxe/tcpip.h>
+#include <ipxe/dhcp.h>
+#include <ipxe/settings.h>
+#include <ipxe/console.h>
+#include <ipxe/lineconsole.h>
+#include <ipxe/tls.h>
+#include <ipxe/syslog.h>
+#include <config/console.h>
+
+/* Set default console usage if applicable */
+#if ! ( defined ( CONSOLE_SYSLOGS ) && CONSOLE_EXPLICIT ( CONSOLE_SYSLOGS ) )
+#undef CONSOLE_SYSLOGS
+#define CONSOLE_SYSLOGS ( CONSOLE_USAGE_ALL & ~CONSOLE_USAGE_TUI )
+#endif
+
+struct console_driver syslogs_console __console_driver;
+
+/** The encrypted syslog server */
+static struct sockaddr_tcpip logserver = {
+ .st_port = htons ( SYSLOG_PORT ),
+};
+
+/**
+ * Handle encrypted syslog TLS interface close
+ *
+ * @v intf Interface
+ * @v rc Reason for close
+ */
+static void syslogs_close ( struct interface *intf __unused, int rc ) {
+
+ DBG ( "SYSLOGS console disconnected: %s\n", strerror ( rc ) );
+}
+
+/**
+ * Handle encrypted syslog TLS interface window change
+ *
+ * @v intf Interface
+ */
+static void syslogs_window_changed ( struct interface *intf ) {
+
+ /* Mark console as enabled when window first opens, indicating
+ * that TLS negotiation is complete. (Do not disable console
+ * when window closes again, since TCP will close the window
+ * whenever there is unACKed data.)
+ */
+ if ( xfer_window ( intf ) ) {
+ if ( syslogs_console.disabled )
+ DBG ( "SYSLOGS console connected\n" );
+ syslogs_console.disabled = 0;
+ }
+}
+
+/** Encrypted syslog TLS interface operations */
+static struct interface_operation syslogs_operations[] = {
+ INTF_OP ( xfer_window_changed, struct interface *,
+ syslogs_window_changed ),
+ INTF_OP ( intf_close, struct interface *, syslogs_close ),
+};
+
+/** Encrypted syslog TLS interface descriptor */
+static struct interface_descriptor syslogs_desc =
+ INTF_DESC_PURE ( syslogs_operations );
+
+/** The encrypted syslog TLS interface */
+static struct interface syslogs = INTF_INIT ( syslogs_desc );
+
+/******************************************************************************
+ *
+ * Console driver
+ *
+ ******************************************************************************
+ */
+
+/** Encrypted syslog line buffer */
+static char syslogs_buffer[SYSLOG_BUFSIZE];
+
+/** Encrypted syslog severity */
+static unsigned int syslogs_severity = SYSLOG_DEFAULT_SEVERITY;
+
+/**
+ * Handle ANSI set encrypted syslog priority (private sequence)
+ *
+ * @v ctx ANSI escape sequence context
+ * @v count Parameter count
+ * @v params List of graphic rendition aspects
+ */
+static void syslogs_handle_priority ( struct ansiesc_context *ctx __unused,
+ unsigned int count __unused,
+ int params[] ) {
+ if ( params[0] >= 0 ) {
+ syslogs_severity = params[0];
+ } else {
+ syslogs_severity = SYSLOG_DEFAULT_SEVERITY;
+ }
+}
+
+/** Encrypted syslog ANSI escape sequence handlers */
+static struct ansiesc_handler syslogs_handlers[] = {
+ { ANSIESC_LOG_PRIORITY, syslogs_handle_priority },
+ { 0, NULL }
+};
+
+/** Encrypted syslog line console */
+static struct line_console syslogs_line = {
+ .buffer = syslogs_buffer,
+ .len = sizeof ( syslogs_buffer ),
+ .ctx = {
+ .handlers = syslogs_handlers,
+ },
+};
+
+/** Encrypted syslog recursion marker */
+static int syslogs_entered;
+
+/**
+ * Print a character to encrypted syslog console
+ *
+ * @v character Character to be printed
+ */
+static void syslogs_putchar ( int character ) {
+ int rc;
+
+ /* Ignore if we are already mid-logging */
+ if ( syslogs_entered )
+ return;
+
+ /* Fill line buffer */
+ if ( line_putchar ( &syslogs_line, character ) == 0 )
+ return;
+
+ /* Guard against re-entry */
+ syslogs_entered = 1;
+
+ /* Send log message */
+ if ( ( rc = syslog_send ( &syslogs, syslogs_severity,
+ syslogs_buffer, "\n" ) ) != 0 ) {
+ DBG ( "SYSLOGS could not send log message: %s\n",
+ strerror ( rc ) );
+ }
+
+ /* Clear re-entry flag */
+ syslogs_entered = 0;
+}
+
+/** Encrypted syslog console driver */
+struct console_driver syslogs_console __console_driver = {
+ .putchar = syslogs_putchar,
+ .disabled = CONSOLE_DISABLED,
+ .usage = CONSOLE_SYSLOGS,
+};
+
+/******************************************************************************
+ *
+ * Settings
+ *
+ ******************************************************************************
+ */
+
+/** Encrypted syslog server setting */
+const struct setting syslogs_setting __setting ( SETTING_MISC, syslogs ) = {
+ .name = "syslogs",
+ .description = "Encrypted syslog server",
+ .tag = DHCP_EB_SYSLOGS_SERVER,
+ .type = &setting_type_string,
+};
+
+/**
+ * Apply encrypted syslog settings
+ *
+ * @ret rc Return status code
+ */
+static int apply_syslogs_settings ( void ) {
+ static char *old_server;
+ char *server;
+ struct interface *socket;
+ int rc;
+
+ /* Fetch log server */
+ fetch_string_setting_copy ( NULL, &syslogs_setting, &server );
+
+ /* Do nothing unless log server has changed */
+ if ( ( ( server == NULL ) && ( old_server == NULL ) ) ||
+ ( ( server != NULL ) && ( old_server != NULL ) &&
+ ( strcmp ( server, old_server ) == 0 ) ) ) {
+ rc = 0;
+ goto out_no_change;
+ }
+ free ( old_server );
+ old_server = NULL;
+
+ /* Reset encrypted syslog connection */
+ syslogs_console.disabled = CONSOLE_DISABLED;
+ intf_restart ( &syslogs, 0 );
+
+ /* Do nothing unless we have a log server */
+ if ( ! server ) {
+ DBG ( "SYSLOGS has no log server\n" );
+ rc = 0;
+ goto out_no_server;
+ }
+
+ /* Add TLS filter */
+ if ( ( rc = add_tls ( &syslogs, server, &socket ) ) != 0 ) {
+ DBG ( "SYSLOGS cannot create TLS filter: %s\n",
+ strerror ( rc ) );
+ goto err_add_tls;
+ }
+
+ /* Connect to log server */
+ if ( ( rc = xfer_open_named_socket ( socket, SOCK_STREAM,
+ (( struct sockaddr *) &logserver ),
+ server, NULL ) ) != 0 ) {
+ DBG ( "SYSLOGS cannot connect to log server: %s\n",
+ strerror ( rc ) );
+ goto err_open_named_socket;
+ }
+ DBG ( "SYSLOGS using log server %s\n", server );
+
+ /* Record log server */
+ old_server = server;
+ server = NULL;
+
+ /* Success */
+ rc = 0;
+
+ err_open_named_socket:
+ err_add_tls:
+ out_no_server:
+ out_no_change:
+ free ( server );
+ return rc;
+}
+
+/** Encrypted syslog settings applicator */
+struct settings_applicator syslogs_applicator __settings_applicator = {
+ .apply = apply_syslogs_settings,
+};
Code Review / kvmfornfv.git / blobdiff