dropbear: version bump 2019.78 -> 2020.79

Noteworthy changes (not all options accessible through ptxdist menu):

- added support for ed25519 hostkeys and authorized_keys
- added support for chacha20-poly1305 authenticated cipher
- added support for and rsa-sha2 signatures
- disabled some options by default (kconfig defaults adapted accordingly)
- blowfish has been removed
- fix idle detection clashing with keepalives
- scp fix for CVE-2018-20685 where a server could modify name of output
  files
- Call fsync() is called on parent directory when writing key files to
  ensure they are flushed

One especially important change:

> Use getrandom() call on Linux to ensure sufficient entropy has been
> gathered at startup.  Dropbear now avoids reading from the random
> source at startup, instead waiting until the first connection. It is
> possible that some platforms were running without enough entropy
> previously, those could potentially block at first boot generating
> host keys.  The dropbear "-R" option is one way to avoid that.

On older toolchains/kernel headers/kernels without getrandom() support,
dropbear should behave like before.

The curve25519 implementation was replaced with the one by TweetNaCl,
which induced a change in 'LICENSE' summary.  The old implementation was
licensed BSD-3-Clause and the new is public domain.

The bundled libtommath changed its license from dual license (public
domain || WTFPL) to 'Unlicense' which is also a public domain license,
but with a differently worded license text and an actual SPDX
identifier.

The patch stack was dropped, the one patch was integrated upstream.

Signed-off-by: Alexander Dahl <ada@thorsis.com>
Message-Id: <20201116080552.25031-5-ada@thorsis.com>
Signed-off-by: Michael Olbrich <m.olbrich@pengutronix.de>

2 files changed, 7 insertions, 6 deletions

diff --git a/rules/dropbear.in b/rules/dropbear.in
index 7f777ae64..c0da7e222 100644
--- a/rules/dropbear.in
+++ b/rules/dropbear.in
@@ -116,6 +116,7 @@ comment "features"
 config DROPBEAR_DIS_X11
 	bool
 	prompt "disable X11 Forwarding"
+	default y
 	help
 	  X11 forwarding means passing X11 (graphical interface)
 	  information over the SSH connection.
@@ -149,7 +150,6 @@ config DROPBEAR_AES128
 config DROPBEAR_3DES
 	bool
 	prompt "3DES"
-	default y
 	help
 	  DES is an IBM algorithm designed during the 1970s.
 	  In 1976, NIST has officially adopted it as an encryption
diff --git a/rules/dropbear.make b/rules/dropbear.make
index e422eb4d5..a9404592e 100644
--- a/rules/dropbear.make
+++ b/rules/dropbear.make
@@ -16,19 +16,19 @@ PACKAGES-$(PTXCONF_DROPBEAR) += dropbear
 #
 # Paths and names
 #
-DROPBEAR_VERSION	:= 2019.78
-DROPBEAR_MD5		:= a972c85ed678ad0fdcb7844e1294fb54
+DROPBEAR_VERSION	:= 2020.79
+DROPBEAR_MD5		:= 830a7bf6349ac52a39c487d061efb352
 DROPBEAR		:= dropbear-$(DROPBEAR_VERSION)
 DROPBEAR_SUFFIX		:= tar.bz2
 DROPBEAR_URL		:= http://matt.ucc.asn.au/dropbear/releases/$(DROPBEAR).$(DROPBEAR_SUFFIX)
 DROPBEAR_SOURCE		:= $(SRCDIR)/$(DROPBEAR).$(DROPBEAR_SUFFIX)
 DROPBEAR_DIR		:= $(BUILDDIR)/$(DROPBEAR)
 DROPBEAR_LICENSE	:= \
-	MIT AND BSD-2-Clause AND BSD-3-Clause AND SSH-short AND (public_domain OR WTFPL)
+	MIT AND BSD-2-Clause AND public_domain AND SSH-short AND (public_domain OR WTFPL) AND Unlicense
 DROPBEAR_LICENSE_FILES	:= \
-	file://LICENSE;md5=a5ec40cafba26fc4396d0b550f824e01 \
+	file://LICENSE;md5=da58928b5d844c6667963cb5a109272d \
 	file://libtomcrypt/LICENSE;md5=71baacc459522324ef3e2b9e052e8180 \
-	file://libtommath/LICENSE;md5=f72771f4af5e8c382974750f9f8701ad \
+	file://libtommath/LICENSE;md5=23e7e0a32e53a2b1d35f5fd9ef053402 \
 	file://loginrec.c;startline=1;endline=26;md5=0d785ee11fab1cead2c7fee9c35574f1
 
 # ----------------------------------------------------------------------------
@@ -48,6 +48,7 @@ DROPBEAR_CONF_OPT 	:= \
 	--$(call ptx/disen, PTXCONF_DROPBEAR_DIS_OPENPTY)-openpty \
 	--$(call ptx/disen, PTXCONF_DROPBEAR_DIS_SYSLOG)-syslog \
 	--enable-shadow \
+	--disable-plugin \
 	--disable-fuzz \
 	--enable-bundled-libtom \
 	--$(call ptx/disen, PTXCONF_DROPBEAR_DIS_LASTLOG)-lastlog \