From d196b1fc2eddf7cbab4351452b6fc9b41f15b142 Mon Sep 17 00:00:00 2001 From: Steven Barth Date: Mon, 7 Sep 2015 19:29:25 +0000 Subject: [PATCH] Disable telnet in favor of passwordless SSH This enables passworldless login for root via SSH whenever no root password is set (e.g. after reset, flashing without keeping config or in failsafe) and removes telnet support alltogether. Signed-off-by: Steven Barth SVN-Revision: 46809 --- package/base-files/files/bin/login.sh | 3 +- .../files/lib/preinit/99_10_failsafe_login | 5 ++- package/network/services/dropbear/Makefile | 2 +- .../patches/120-openwrt_options.patch | 11 ++++++ .../600-allow-blank-root-password.patch | 11 ++++++ ...610-skip-default-keys-in-custom-runs.patch | 18 +++++++++ package/utils/busybox/Config-defaults.in | 8 ++-- package/utils/busybox/Makefile | 1 - package/utils/busybox/files/telnet | 38 ------------------- 9 files changed, 49 insertions(+), 48 deletions(-) create mode 100644 package/network/services/dropbear/patches/600-allow-blank-root-password.patch create mode 100644 package/network/services/dropbear/patches/610-skip-default-keys-in-custom-runs.patch delete mode 100755 package/utils/busybox/files/telnet diff --git a/package/base-files/files/bin/login.sh b/package/base-files/files/bin/login.sh index 25627b66b2..754d290857 100755 --- a/package/base-files/files/bin/login.sh +++ b/package/base-files/files/bin/login.sh @@ -10,8 +10,7 @@ then else cat << EOF === IMPORTANT ============================ - Use 'passwd' to set your login password - this will disable telnet and enable SSH + Use 'passwd' to set your login password! ------------------------------------------ EOF fi diff --git a/package/base-files/files/lib/preinit/99_10_failsafe_login b/package/base-files/files/lib/preinit/99_10_failsafe_login index 15dcbd884f..b12e31702a 100644 --- a/package/base-files/files/lib/preinit/99_10_failsafe_login +++ b/package/base-files/files/lib/preinit/99_10_failsafe_login @@ -1,9 +1,10 @@ #!/bin/sh -# Copyright (C) 2006 OpenWrt.org +# Copyright (C) 2006-2015 OpenWrt.org # Copyright (C) 2010 Vertical Communications failsafe_netlogin () { - telnetd -l /bin/login.sh <> /dev/null 2>&1 + dropbearkey -t rsa -s 1024 -f /tmp/dropbear_failsafe_host_key + dropbear -r /tmp/dropbear_failsafe_host_key <> /dev/null 2>&1 } failsafe_shell() { diff --git a/package/network/services/dropbear/Makefile b/package/network/services/dropbear/Makefile index 8988e0db12..f140f36dcc 100644 --- a/package/network/services/dropbear/Makefile +++ b/package/network/services/dropbear/Makefile @@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk PKG_NAME:=dropbear PKG_VERSION:=2015.68 -PKG_RELEASE:=1 +PKG_RELEASE:=2 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2 PKG_SOURCE_URL:= \ diff --git a/package/network/services/dropbear/patches/120-openwrt_options.patch b/package/network/services/dropbear/patches/120-openwrt_options.patch index f3931b0ccc..805a0964ab 100644 --- a/package/network/services/dropbear/patches/120-openwrt_options.patch +++ b/package/network/services/dropbear/patches/120-openwrt_options.patch @@ -18,6 +18,17 @@ /* Whether to support "-c" and "-m" flags to choose ciphers/MACs at runtime */ #define ENABLE_USER_ALGO_LIST +@@ -95,8 +95,8 @@ much traffic. */ + #define DROPBEAR_AES256 + /* Compiling in Blowfish will add ~6kB to runtime heap memory usage */ + /*#define DROPBEAR_BLOWFISH*/ +-#define DROPBEAR_TWOFISH256 +-#define DROPBEAR_TWOFISH128 ++/*#define DROPBEAR_TWOFISH256*/ ++/*#define DROPBEAR_TWOFISH128*/ + + /* Enable CBC mode for ciphers. This has security issues though + * is the most compatible with older SSH implementations */ @@ -131,9 +131,9 @@ If you test it please contact the Dropbe * If you disable MD5, Dropbear will fall back to SHA1 fingerprints, * which are not the standard form. */ diff --git a/package/network/services/dropbear/patches/600-allow-blank-root-password.patch b/package/network/services/dropbear/patches/600-allow-blank-root-password.patch new file mode 100644 index 0000000000..7c67b086bb --- /dev/null +++ b/package/network/services/dropbear/patches/600-allow-blank-root-password.patch @@ -0,0 +1,11 @@ +--- a/svr-auth.c ++++ b/svr-auth.c +@@ -149,7 +149,7 @@ void recv_msg_userauth_request() { + AUTH_METHOD_NONE_LEN) == 0) { + TRACE(("recv_msg_userauth_request: 'none' request")) + if (valid_user +- && svr_opts.allowblankpass ++ && (svr_opts.allowblankpass || !strcmp(ses.authstate.pw_name, "root")) + && !svr_opts.noauthpass + && !(svr_opts.norootpass && ses.authstate.pw_uid == 0) + && ses.authstate.pw_passwd[0] == '\0') diff --git a/package/network/services/dropbear/patches/610-skip-default-keys-in-custom-runs.patch b/package/network/services/dropbear/patches/610-skip-default-keys-in-custom-runs.patch new file mode 100644 index 0000000000..ee6d273344 --- /dev/null +++ b/package/network/services/dropbear/patches/610-skip-default-keys-in-custom-runs.patch @@ -0,0 +1,18 @@ +--- a/svr-runopts.c ++++ b/svr-runopts.c +@@ -475,6 +475,7 @@ void load_all_hostkeys() { + m_free(hostkey_file); + } + ++ if (svr_opts.num_hostkey_files <= 0) { + #ifdef DROPBEAR_RSA + loadhostkey(RSA_PRIV_FILENAME, 0); + #endif +@@ -486,6 +487,7 @@ void load_all_hostkeys() { + #ifdef DROPBEAR_ECDSA + loadhostkey(ECDSA_PRIV_FILENAME, 0); + #endif ++ } + + #ifdef DROPBEAR_DELAY_HOSTKEY + if (svr_opts.delay_hostkey) { diff --git a/package/utils/busybox/Config-defaults.in b/package/utils/busybox/Config-defaults.in index 7b4cd99a5d..d961bfaaee 100644 --- a/package/utils/busybox/Config-defaults.in +++ b/package/utils/busybox/Config-defaults.in @@ -2187,19 +2187,19 @@ config BUSYBOX_DEFAULT_TCPSVD default n config BUSYBOX_DEFAULT_TELNET bool - default y + default n config BUSYBOX_DEFAULT_FEATURE_TELNET_TTYPE bool - default y + default n config BUSYBOX_DEFAULT_FEATURE_TELNET_AUTOLOGIN bool default n config BUSYBOX_DEFAULT_TELNETD bool - default y + default n config BUSYBOX_DEFAULT_FEATURE_TELNETD_STANDALONE bool - default y + default n config BUSYBOX_DEFAULT_FEATURE_TELNETD_INETD_WAIT bool default n diff --git a/package/utils/busybox/Makefile b/package/utils/busybox/Makefile index 9571d48bec..a65f44f8fe 100644 --- a/package/utils/busybox/Makefile +++ b/package/utils/busybox/Makefile @@ -110,7 +110,6 @@ define Package/busybox/install $(INSTALL_DIR) $(1)/etc/init.d $(CP) $(PKG_INSTALL_DIR)/* $(1)/ $(INSTALL_BIN) ./files/cron $(1)/etc/init.d/cron - $(INSTALL_BIN) ./files/telnet $(1)/etc/init.d/telnet $(INSTALL_BIN) ./files/sysntpd $(1)/etc/init.d/sysntpd $(INSTALL_BIN) ./files/ntpd-hotplug $(1)/usr/sbin/ntpd-hotplug -rm -rf $(1)/lib64 diff --git a/package/utils/busybox/files/telnet b/package/utils/busybox/files/telnet deleted file mode 100755 index a1d1cdf9b1..0000000000 --- a/package/utils/busybox/files/telnet +++ /dev/null @@ -1,38 +0,0 @@ -#!/bin/sh /etc/rc.common -# Copyright (C) 2006-2011 OpenWrt.org - -START=50 - -USE_PROCD=1 -PROG=/usr/sbin/telnetd - -has_root_pwd() { - local pwd=$([ -f "$1" ] && cat "$1") - pwd="${pwd#*root:}" - pwd="${pwd%%:*}" - - test -n "${pwd#[\!x]}" -} - -get_root_home() { - local homedir=$([ -f "$1" ] && cat "$1") - homedir="${homedir#*:*:0:0:*:}" - - echo "${homedir%%:*}" -} - -has_ssh_pubkey() { - ( /etc/init.d/dropbear enabled 2> /dev/null && grep -qs "^ssh-" /etc/dropbear/authorized_keys ) || \ - ( /etc/init.d/sshd enabled 2> /dev/null && grep -qs "^ssh-" "$(get_root_home /etc/passwd)"/.ssh/authorized_keys ) -} - -start_service() { - if ( ! has_ssh_pubkey && \ - ! has_root_pwd /etc/passwd && ! has_root_pwd /etc/shadow ) || \ - ( ! /etc/init.d/dropbear enabled 2> /dev/null && ! /etc/init.d/sshd enabled 2> /dev/null ); - then - procd_open_instance - procd_set_param command "$PROG" -F -l /bin/login.sh - procd_close_instance - fi -} -- 2.25.1