openwrt/package/network/services/dropbear/Config.in

menu "Configuration"
	depends on PACKAGE_dropbear

config DROPBEAR_CURVE25519
	bool "Curve25519 support"
	default y
	help
		This enables the following key exchange algorithm:
		  [email protected]

		Increases binary size by about 4 kB (MIPS).

config DROPBEAR_ECC
	bool "Elliptic curve cryptography (ECC)"
	help
		Enables basic support for elliptic curve cryptography (ECC)
		in key exchange and public key authentication.

		Key exchange algorithms:
		  ecdh-sha2-nistp256

		Public key algorithms:
		  ecdsa-sha2-nistp256

		Increases binary size by about 24 kB (MIPS).

		Note: select DROPBEAR_ECC_FULL if full ECC support is required.

config DROPBEAR_ECC_FULL
	bool "Elliptic curve cryptography (ECC), full support"
	depends on DROPBEAR_ECC
	help
		Enables full support for elliptic curve cryptography (ECC)
		in key exchange and public key authentication.

		Key exchange algorithms:
		  ecdh-sha2-nistp256 (*)
		  ecdh-sha2-nistp384
		  ecdh-sha2-nistp521

		Public key algorithms:
		  ecdsa-sha2-nistp256 (*)
		  ecdsa-sha2-nistp384
		  ecdsa-sha2-nistp521

		(*) - basic ECC support; provided by DROPBEAR_ECC.

		Increases binary size by about 4 kB (MIPS).

config DROPBEAR_ED25519
	bool "Ed25519 support"
	default y if !SMALL_FLASH
	help
		This enables the following public key algorithm:
		  ssh-ed25519

		Increases binary size by about 12 kB (MIPS).

config DROPBEAR_CHACHA20POLY1305
	bool "Chacha20-Poly1305 support"
	default y
	help
		This enables the following authenticated encryption cipher:
		  [email protected]

		Increases binary size by about 4 kB (MIPS).

config DROPBEAR_U2F
	bool "U2F/FIDO support"
	default y
	help
		This option itself doesn't enable any support for U2F/FIDO
		but subordinate options do:

		- DROPBEAR_ECDSA_SK   - ecdsa-sk keys support
		  depends on DROPBEAR_ECC ("Elliptic curve cryptography (ECC)")
		- DROPBEAR_ED25519_SK - ed25519-sk keys support
		  depends on DROPBEAR_ED25519 ("Ed25519 support")

config DROPBEAR_ECDSA_SK
	bool "ECDSA-SK support"
	default y
	depends on DROPBEAR_U2F && DROPBEAR_ECC
	help
		This enables the following public key algorithm:
		  [email protected]

config DROPBEAR_ED25519_SK
	bool "Ed25519-SK support"
	default y
	depends on DROPBEAR_U2F && DROPBEAR_ED25519
	help
		This enables the following public key algorithm:
		  [email protected]

config DROPBEAR_ZLIB
	bool "Enable compression"
	help
		Enables compression using shared zlib library.

		Increases binary size by about 0.1 kB (MIPS) and requires
		additional 62 kB (MIPS) for a shared zlib library.

config DROPBEAR_UTMP
	bool "Utmp support"
	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"
	depends on DROPBEAR_UTMP
	help
		Dropbear will use pututline() to write the utmp structure into
		the utmp file.

config DROPBEAR_DBCLIENT
	bool "Build dropbear with dbclient"
	default y

config DROPBEAR_ASKPASS
	bool "Enable askpass helper support"
	depends on DROPBEAR_DBCLIENT
	help
		This enables support for ssh-askpass helper in dropbear client
		in order to authenticate on remote hosts.

		Increases binary size by about 0.1 kB (MIPS).

config DROPBEAR_DBCLIENT_AGENTFORWARD
	bool "Enable agent forwarding in dbclient [LEGACY/SECURITY]"
	default y
	depends on DROPBEAR_DBCLIENT
	help
		Increases binary size by about 0.1 kB (MIPS).

		Security notes:

		SSH agent forwarding might cause security issues (locally and
		on the jump machine).

		Hovewer, it's enabled by default for compatibility with
		previous OpenWrt/dropbear releases.

		Consider DISABLING this option if you're building own OpenWrt
		image.

		Also see DROPBEAR_AGENTFORWARD (agent forwarding in dropbear
		server itself).

config DROPBEAR_SCP
	bool "Build dropbear with scp"
	default y

config DROPBEAR_AGENTFORWARD
	bool "Enable agent forwarding [LEGACY/SECURITY]"
	default y
	help
		Increases binary size by about 0.1 kB (MIPS).

		Security notes:

		SSH agent forwarding might cause security issues (locally and
		on the jump machine).

		Hovewer, it's enabled by default for compatibility with
		previous OpenWrt/dropbear releases.

		Consider DISABLING this option if you're building own OpenWrt
		image.

		Also see DROPBEAR_DBCLIENT_AGENTFORWARD (agent forwarding in
		dropbear client) if DROPBEAR_DBCLIENT is selected.

config DROPBEAR_MODERN_ONLY
	bool "Use modern crypto only [BREAKS COMPATIBILITY]"
	select DROPBEAR_ED25519
	select DROPBEAR_CURVE25519
	select DROPBEAR_CHACHA20POLY1305
	help
		This option enables:
		 - Chacha20-Poly1305
		 - Curve25519
		 - Ed25519
		and disables:
		 - AES
		 - RSA

		Reduces binary size by about 64 kB (MIPS) from default
		configuration.

		Consider enabling this option if you're building own OpenWrt
		image and using modern SSH software everywhere.

endmenu