From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Mon, 22 Aug 2016 19:14:52 +0200
Subject: dropbear: update to LEDE 277f85c21ae0ede4e15e66cbd801b9fb502531df

Includes a few security updates and enables Curve25519 support.

The patches 600-allow-blank-root-password.patch and
610-skip-default-keys-in-custom-runs.patch are left out for now to avoid
allowing password-less root login.

diff --git a/package/network/services/dropbear/Config.in b/package/network/services/dropbear/Config.in
index e2a761034fa64225439db4a18030dee75fb0775c..7c2edd79f23708f9ef01c6a62a54073b0c7a33ed 100644
--- a/package/network/services/dropbear/Config.in
+++ b/package/network/services/dropbear/Config.in
@@ -1,6 +1,15 @@
 menu "Configuration"
 	depends on PACKAGE_dropbear
 
+config DROPBEAR_CURVE25519
+	bool "Curve25519 support"
+	default y
+	help
+		This enables the following key exchange algorithm:
+		  curve25519-sha256@libssh.org
+
+		Increases binary size by about 13 kB uncompressed (MIPS).
+
 config DROPBEAR_ECC
 	bool "Elliptic curve cryptography (ECC)"
 	default n
@@ -12,7 +21,6 @@ config DROPBEAR_ECC
 		  ecdh-sha2-nistp256
 		  ecdh-sha2-nistp384
 		  ecdh-sha2-nistp521
-		  curve25519-sha256@libssh.org
 
 		Public key algorithms:
 		  ecdsa-sha2-nistp256
@@ -22,6 +30,21 @@ config DROPBEAR_ECC
 		Does not generate ECC host keys by default (ECC key exchange will not be used,
 		only ECC public key auth).
 
-		Increases binary size by about 36 kB (MIPS).
+		Increases binary size by about 23 kB (MIPS).
+
+config DROPBEAR_UTMP
+	bool "Utmp support"
+	default n
+	depends on BUSYBOX_CONFIG_FEATURE_UTMP
+	help
+		This enables dropbear utmp support, the file /var/run/utmp is used to
+		track who is currently logged in.
+
+config DROPBEAR_PUTUTLINE
+	bool "Pututline support"
+	default n
+	depends on DROPBEAR_UTMP
+	help
+		Dropbear will use pututline() to write the utmp structure into the utmp file.
 
 endmenu
diff --git a/package/network/services/dropbear/Makefile b/package/network/services/dropbear/Makefile
index 35958d332cd0c9796ba50c433b13a3e24cd4441c..36bcb4ab7b6c57460cd15da1bcc130af62e32bc6 100644
--- a/package/network/services/dropbear/Makefile
+++ b/package/network/services/dropbear/Makefile
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2006-2014 OpenWrt.org
+# Copyright (C) 2006-2016 OpenWrt.org
 #
 # This is free software, licensed under the GNU General Public License v2.
 # See /LICENSE for more information.
@@ -8,14 +8,14 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=dropbear
-PKG_VERSION:=2015.67
+PKG_VERSION:=2016.74
 PKG_RELEASE:=1
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
 PKG_SOURCE_URL:= \
 	http://matt.ucc.asn.au/dropbear/releases/ \
 	https://dropbear.nl/mirror/releases/
-PKG_MD5SUM:=e967e320344cd4bfebe321e3ab8514d6
+PKG_MD5SUM:=9ad0172731e0f16623937804643b5bd8
 
 PKG_LICENSE:=MIT
 PKG_LICENSE_FILES:=LICENSE libtomcrypt/LICENSE libtommath/LICENSE
@@ -23,10 +23,14 @@ PKG_LICENSE_FILES:=LICENSE libtomcrypt/LICENSE libtommath/LICENSE
 PKG_BUILD_PARALLEL:=1
 PKG_USE_MIPS16:=0
 
-PKG_CONFIG_DEPENDS:=CONFIG_DROPBEAR_ECC
+PKG_CONFIG_DEPENDS:=CONFIG_TARGET_INIT_PATH CONFIG_DROPBEAR_ECC CONFIG_DROPBEAR_CURVE25519
 
 include $(INCLUDE_DIR)/package.mk
 
+ifneq ($(DUMP),1)
+  STAMP_CONFIGURED:=$(strip $(STAMP_CONFIGURED))_$(shell $(SH_FUNC) echo $(CONFIG_TARGET_INIT_PATH) | md5s)
+endif
+
 define Package/dropbear/Default
   URL:=http://matt.ucc.asn.au/dropbear/
 endef
@@ -48,7 +52,6 @@ endef
 
 define Package/dropbear/conffiles
 /etc/dropbear/dropbear_rsa_host_key
-/etc/dropbear/dropbear_dss_host_key 
 /etc/config/dropbear 
 endef
 
@@ -65,25 +68,35 @@ CONFIGURE_ARGS += \
 	--enable-syslog \
 	$(if $(CONFIG_SHADOW_PASSWORDS),,--disable-shadow) \
 	--disable-lastlog \
-	--disable-utmp \
 	--disable-utmpx \
+	$(if $(CONFIG_DROPBEAR_UTMP),,--disable-utmp) \
 	--disable-wtmp \
 	--disable-wtmpx \
 	--disable-loginfunc \
-	--disable-pututline \
+	$(if $(CONFIG_DROPBEAR_PUTUTLINE),,--disable-pututline) \
 	--disable-pututxline \
 	--disable-zlib \
 	--enable-bundled-libtom
 
-TARGET_CFLAGS += -DARGTYPE=3 -ffunction-sections -fdata-sections
+TARGET_CFLAGS += -DDEFAULT_PATH=\\\"$(CONFIG_TARGET_INIT_PATH)\\\" -DARGTYPE=3 -ffunction-sections -fdata-sections
 TARGET_LDFLAGS += -Wl,--gc-sections
 
 define Build/Configure
 	$(Build/Configure/Default)
 
+	$(SED) 's,^#define DEFAULT_PATH .*$$$$,#define DEFAULT_PATH "$(CONFIG_TARGET_INIT_PATH)",g' \
+		$(PKG_BUILD_DIR)/options.h
+
+	awk 'BEGIN { rc = 1 } \
+	     /'DROPBEAR_CURVE25519'/ { $$$$0 = "$(if $(CONFIG_DROPBEAR_CURVE25519),,// )#define 'DROPBEAR_CURVE25519'"; rc = 0 } \
+	     { print } \
+	     END { exit(rc) }' $(PKG_BUILD_DIR)/options.h \
+	     >$(PKG_BUILD_DIR)/options.h.new && \
+	mv $(PKG_BUILD_DIR)/options.h.new $(PKG_BUILD_DIR)/options.h
+
 	# Enforce that all replacements are made, otherwise options.h has changed
 	# format and this logic is broken.
-	for OPTION in DROPBEAR_ECDSA DROPBEAR_ECDH DROPBEAR_CURVE25519; do \
+	for OPTION in DROPBEAR_ECDSA DROPBEAR_ECDH; do \
 	  awk 'BEGIN { rc = 1 } \
 	       /'$$$$OPTION'/ { $$$$0 = "$(if $(CONFIG_DROPBEAR_ECC),,// )#define '$$$$OPTION'"; rc = 0 } \
 	       { print } \
@@ -91,6 +104,9 @@ define Build/Configure
 	       >$(PKG_BUILD_DIR)/options.h.new && \
 	  mv $(PKG_BUILD_DIR)/options.h.new $(PKG_BUILD_DIR)/options.h || exit 1; \
 	done
+
+	# Enforce rebuild of svr-chansession.c
+	rm -f $(PKG_BUILD_DIR)/svr-chansession.o
 endef
 
 define Build/Compile
@@ -118,7 +134,6 @@ define Package/dropbear/install
 	$(INSTALL_DIR) $(1)/usr/lib/opkg/info
 	$(INSTALL_DIR) $(1)/etc/dropbear
 	touch $(1)/etc/dropbear/dropbear_rsa_host_key
-	touch $(1)/etc/dropbear/dropbear_dss_host_key
 endef
 
 define Package/dropbearconvert/install
diff --git a/package/network/services/dropbear/files/dropbear.init b/package/network/services/dropbear/files/dropbear.init
index 6de0142728dfa127652ecceef1d25080069d800a..1653efbdb38b1037c3630595b903c839887a4e52 100755
--- a/package/network/services/dropbear/files/dropbear.init
+++ b/package/network/services/dropbear/files/dropbear.init
@@ -37,7 +37,6 @@ validate_section_dropbear()
 		'RootPasswordAuth:bool:1' \
 		'RootLogin:bool:1' \
 		'rsakeyfile:file' \
-		'dsskeyfile:file' \
 		'BannerFile:file' \
 		'Port:list(port):22' \
 		'SSHKeepAlive:uinteger:300' \
@@ -49,7 +48,7 @@ dropbear_instance()
 {
 	local PasswordAuth enable Interface GatewayPorts \
 		RootPasswordAuth RootLogin rsakeyfile \
-		dsskeyfile BannerFile Port SSHKeepAlive IdleTimeout \
+		BannerFile Port SSHKeepAlive IdleTimeout \
 		mdns ipaddrs
 
 	validate_section_dropbear "${1}" || {
@@ -75,18 +74,18 @@ dropbear_instance()
 	[ "${RootPasswordAuth}" -eq 0 ] && procd_append_param command -g
 	[ "${RootLogin}" -eq 0 ] && procd_append_param command -w
 	[ -n "${rsakeyfile}" ] && procd_append_param command -r "${rsakeyfile}"
-	[ -n "${dsskeyfile}" ] && procd_append_param command -d "${dsskeyfile}"
 	[ -n "${BannerFile}" ] && procd_append_param command -b "${BannerFile}"
 	append_ports "${ipaddrs}" "${Port}"
 	[ "${IdleTimeout}" -ne 0 ] && procd_append_param command -I "${IdleTimeout}"
 	[ "${SSHKeepAlive}" -ne 0 ] && procd_append_param command -K "${SSHKeepAlive}"
 	[ "${mdns}" -ne 0 ] && procd_add_mdns "ssh" "tcp" "$Port" "daemon=dropbear"
+	procd_set_param respawn
 	procd_close_instance
 }
 
 keygen()
 {
-	for keytype in rsa dss; do
+	for keytype in rsa; do
 		# check for keys
 		key=dropbear/dropbear_${keytype}_host_key
 		[ -f /tmp/$key -o -s /etc/$key ] || {
@@ -107,10 +106,15 @@ keygen()
 	chmod 0700 /etc/dropbear
 }
 
+load_interfaces()
+{
+	config_get interface "$1" Interface
+	interfaces=" ${interface} ${interfaces}"
+}
+
 start_service()
 {
-	[ -s /etc/dropbear/dropbear_rsa_host_key -a \
-	  -s /etc/dropbear/dropbear_dss_host_key ] || keygen
+	[ -s /etc/dropbear/dropbear_rsa_host_key ] || keygen
 
 	. /lib/functions.sh
 	. /lib/functions/network.sh
@@ -121,7 +125,19 @@ start_service()
 
 service_triggers()
 {
-	procd_add_reload_trigger "dropbear"
+	local interfaces
+
+	procd_add_config_trigger "config.change" "dropbear" /etc/init.d/dropbear reload
+
+	config_load "${NAME}"
+	config_foreach load_interfaces dropbear
+
+	[ -n "${interfaces}" ] & {
+		for n in $interfaces ; do
+			procd_add_interface_trigger "interface.*" $n /etc/init.d/dropbear reload
+		done
+	}
+
 	procd_add_validation validate_section_dropbear
 }
 
diff --git a/package/network/services/dropbear/patches/100-pubkey_path.patch b/package/network/services/dropbear/patches/100-pubkey_path.patch
index 456874b730272f157bd3f4b2e9f65e14eda49b0b..41fdc1adab96cf9efffa8593000336c504fdf6fb 100644
--- a/package/network/services/dropbear/patches/100-pubkey_path.patch
+++ b/package/network/services/dropbear/patches/100-pubkey_path.patch
@@ -1,6 +1,6 @@
 --- a/svr-authpubkey.c
 +++ b/svr-authpubkey.c
-@@ -208,17 +208,21 @@ static int checkpubkey(unsigned char* al
+@@ -218,17 +218,21 @@ static int checkpubkey(char* algo, unsig
  		goto out;
  	}
  
@@ -33,7 +33,7 @@
  	if (authfile == NULL) {
  		goto out;
  	}
-@@ -371,26 +375,35 @@ static int checkpubkeyperms() {
+@@ -381,26 +385,35 @@ static int checkpubkeyperms() {
  		goto out;
  	}
  
diff --git a/package/network/services/dropbear/patches/110-change_user.patch b/package/network/services/dropbear/patches/110-change_user.patch
index 7982af631539e351d3d46f50541115f9311612db..4b5c1cb51bb16a7229c03b6298796769e5752f6b 100644
--- a/package/network/services/dropbear/patches/110-change_user.patch
+++ b/package/network/services/dropbear/patches/110-change_user.patch
@@ -1,6 +1,6 @@
 --- a/svr-chansession.c
 +++ b/svr-chansession.c
-@@ -920,12 +920,12 @@ static void execchild(void *user_data) {
+@@ -922,12 +922,12 @@ static void execchild(void *user_data) {
  	/* We can only change uid/gid as root ... */
  	if (getuid() == 0) {
  
diff --git a/package/network/services/dropbear/patches/120-openwrt_options.patch b/package/network/services/dropbear/patches/120-openwrt_options.patch
index 48dae73b1f7bcb052172f0a8d22d06203c80f993..f16aaf001eee11811be81fa1db399cf117e66595 100644
--- a/package/network/services/dropbear/patches/120-openwrt_options.patch
+++ b/package/network/services/dropbear/patches/120-openwrt_options.patch
@@ -18,7 +18,28 @@
  
  /* Whether to support "-c" and "-m" flags to choose ciphers/MACs at runtime */
  #define ENABLE_USER_ALGO_LIST
-@@ -126,9 +126,9 @@ much traffic. */
+@@ -91,16 +91,16 @@ much traffic. */
+  * Including multiple keysize variants the same cipher 
+  * (eg AES256 as well as AES128) will result in a minimal size increase.*/
+ #define DROPBEAR_AES128
+-#define DROPBEAR_3DES
++/*#define DROPBEAR_3DES*/
+ #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 */
+-#define DROPBEAR_ENABLE_CBC_MODE
++/*#define DROPBEAR_ENABLE_CBC_MODE*/
+ 
+ /* Enable "Counter Mode" for ciphers. This is more secure than normal
+  * CBC mode against certain attacks. It is recommended for security
+@@ -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. */
  #define DROPBEAR_SHA1_HMAC
@@ -31,7 +52,16 @@
  #define DROPBEAR_MD5_HMAC
  
  /* You can also disable integrity. Don't bother disabling this if you're
-@@ -184,7 +184,7 @@ much traffic. */
+@@ -146,7 +146,7 @@ If you test it please contact the Dropbe
+  * Removing either of these won't save very much space.
+  * SSH2 RFC Draft requires dss, recommends rsa */
+ #define DROPBEAR_RSA
+-#define DROPBEAR_DSS
++/*#define DROPBEAR_DSS*/
+ /* ECDSA is significantly faster than RSA or DSS. Compiling in ECC
+  * code (either ECDSA or ECDH) increases binary size - around 30kB
+  * on x86-64 */
+@@ -194,7 +194,7 @@ If you test it please contact the Dropbe
  
  /* Whether to print the message of the day (MOTD). This doesn't add much code
   * size */
@@ -40,7 +70,7 @@
  
  /* The MOTD file path */
  #ifndef MOTD_FILENAME
-@@ -226,7 +226,7 @@ much traffic. */
+@@ -242,7 +242,7 @@ Homedir is prepended unless path begins
   * note that it will be provided for all "hidden" client-interactive
   * style prompts - if you want something more sophisticated, use 
   * SSH_ASKPASS instead. Comment out this var to remove this functionality.*/
diff --git a/package/network/services/dropbear/patches/130-ssh_ignore_o_and_x_args.patch b/package/network/services/dropbear/patches/130-ssh_ignore_o_and_x_args.patch
deleted file mode 100644
index edb29093aece5423554ccd406e34b41466c25511..0000000000000000000000000000000000000000
--- a/package/network/services/dropbear/patches/130-ssh_ignore_o_and_x_args.patch
+++ /dev/null
@@ -1,21 +0,0 @@
---- a/cli-runopts.c
-+++ b/cli-runopts.c
-@@ -315,6 +315,10 @@ void cli_getopts(int argc, char ** argv)
- 					debug_trace = 1;
- 					break;
- #endif
-+				case 'o':
-+					next = &dummy;
-+				case 'x':
-+					break;
- 				case 'F':
- 				case 'e':
- #ifndef ENABLE_USER_ALGO_LIST
-@@ -332,7 +336,6 @@ void cli_getopts(int argc, char ** argv)
- 					print_version();
- 					exit(EXIT_SUCCESS);
- 					break;
--				case 'o':
- 				case 'b':
- 					next = &dummy;
- 				default:
diff --git a/package/network/services/dropbear/patches/130-ssh_ignore_x_args.patch b/package/network/services/dropbear/patches/130-ssh_ignore_x_args.patch
new file mode 100644
index 0000000000000000000000000000000000000000..ab09c2f3dc3a253fd18acae8d7d3b4b0f668e3dd
--- /dev/null
+++ b/package/network/services/dropbear/patches/130-ssh_ignore_x_args.patch
@@ -0,0 +1,11 @@
+--- a/cli-runopts.c
++++ b/cli-runopts.c
+@@ -296,6 +296,8 @@ void cli_getopts(int argc, char ** argv)
+ 					debug_trace = 1;
+ 					break;
+ #endif
++				case 'x':
++					break;
+ 				case 'F':
+ 				case 'e':
+ #ifndef ENABLE_USER_ALGO_LIST
diff --git a/package/network/services/dropbear/patches/140-disable_assert.patch b/package/network/services/dropbear/patches/140-disable_assert.patch
index 0717228ef3de0576967b3824ca9709f95a326f61..78b54acfa0f52a4abbae497ed57a04cca7368c41 100644
--- a/package/network/services/dropbear/patches/140-disable_assert.patch
+++ b/package/network/services/dropbear/patches/140-disable_assert.patch
@@ -1,6 +1,6 @@
 --- a/dbutil.h
 +++ b/dbutil.h
-@@ -101,7 +101,11 @@ int m_str_to_uint(const char* str, unsig
+@@ -78,7 +78,11 @@ int m_str_to_uint(const char* str, unsig
  #define DEF_MP_INT(X) mp_int X = {0, 0, 0, NULL}
  
  /* Dropbear assertion */
diff --git a/package/network/services/dropbear/patches/150-dbconvert_standalone.patch b/package/network/services/dropbear/patches/150-dbconvert_standalone.patch
index 367dc2c68122f382273464fc7bf570fde18386ab..ccc2cb792598de77b4db6aa7b7b46e8eb7bf93a5 100644
--- a/package/network/services/dropbear/patches/150-dbconvert_standalone.patch
+++ b/package/network/services/dropbear/patches/150-dbconvert_standalone.patch
@@ -1,8 +1,8 @@
 --- a/options.h
 +++ b/options.h
 @@ -5,6 +5,11 @@
- #ifndef _OPTIONS_H_
- #define _OPTIONS_H_
+ #ifndef DROPBEAR_OPTIONS_H_
+ #define DROPBEAR_OPTIONS_H_
  
 +#if !defined(DROPBEAR_CLIENT) && !defined(DROPBEAR_SERVER)
 +#define DROPBEAR_SERVER
diff --git a/package/network/services/dropbear/patches/500-set-default-path.patch b/package/network/services/dropbear/patches/500-set-default-path.patch
index e2add9415fd4e7884a007ce7337ee8026bcc62a7..da6b9ae0ce0ae6a270f8c7bc6152cf09efbee15d 100644
--- a/package/network/services/dropbear/patches/500-set-default-path.patch
+++ b/package/network/services/dropbear/patches/500-set-default-path.patch
@@ -1,11 +1,12 @@
 --- a/options.h
 +++ b/options.h
-@@ -336,7 +336,7 @@ be overridden at runtime with -I. 0 disa
+@@ -352,7 +352,9 @@ be overridden at runtime with -I. 0 disa
  #define DEFAULT_IDLE_TIMEOUT 0
  
  /* The default path. This will often get replaced by the shell */
--#define DEFAULT_PATH "/usr/bin:/bin"
-+#define DEFAULT_PATH "/bin:/sbin:/usr/bin:/usr/sbin"
++#ifndef DEFAULT_PATH
+ #define DEFAULT_PATH "/usr/bin:/bin"
++#endif
  
  /* Some other defines (that mostly should be left alone) are defined
   * in sysoptions.h */