The default port 22 used by dropbear for its SSH connections is not always
desired. Dropbear accepts an option '-p' to set the port, but doing this was
not possible from the buildroot-provided init script.
One way to fix this is by adding a custom S50dropbear in a project-specific
rootfs overlay. However, this approach has the big disadvantage that bug
fixes or improvements in the default init script (i.e. in newer buildroot
releases) are not available (unless you manually port these changes each
time you upgrade buildroot).
Another solution is to modify the default init script from a
project-specific post-build script. However, this is fragile because you'd
have to sed some line but this line may change in later buildroot releases.
Yet another solution is to change the default port at build time, by
patching the options.h header file in the dropbear sources. This was
proposed with a patch [1] before, but not accepted.
This patch implements another solution, hinted from the discussion in [1]:
the default init script now sources a config file /etc/default/dropbear, in
which the user can set the variable DROPBEAR_ARGS. This is similar to the
S81named init script in the bind package. The config file would be added to
a project-specific rootfs overlay, a custom skeleton, or created from a
post-build script.
This approach has the advantage of being simple and non-intrusive, without
any code duplication or fragile script modifications.
[1] http://lists.busybox.net/pipermail/buildroot/2013-November/083165.html
Signed-off-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Bump to version 2013.62 with ECC support.
Switch the initscript to on-demand key generation and add systemd unit
file.
Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Fixes two security issues:
- The Dropbear server could be made to consume large amounts
of memory because decompressed packet sizes weren't checked.
Depending on the OS and hardware this might be a denial of
service.
- Valid users could be identified due to timing variations.
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Enclose all dropbear sub-options into a 'if BR2_PACKAGE_DROPBEAR'
... 'endif' block rather than having 'depends on BR2_PACKAGE_DROPBEAR'
for each option.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
Switch ECHOs to SEDs to avoid issues with defines changing after
sysoptions.h was included - and it's cleaner.
Enable hmac-sha2-256 and hmac-sha2-512 support for the full featured.
Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
From the release notes:
Security: Fix use-after-free bug that could be triggered if command="..."
authorized_keys restrictions are used. Could allow arbitrary code
execution or bypass of the command="..." restriction to an authenticated
user.
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
Buildroot does not have wtmp or lastlog support by default so allow dropbear
to be configured to stop using them and hence to stop generating system log
error messages.
[Peter: invert to positive options, and disable by default]
Signed-off-by: Will Moore <will.moore@beraninstruments.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
Thanks to the pkgparentdir and pkgname functions, we can rewrite the
AUTOTARGETS macro in a way that avoids the need for each package to
repeat its name and the directory in which it is present.
[Peter: pkgdir->pkgparentdir]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
Changelog @ http://matt.ucc.asn.au/dropbear/CHANGES
Since some build-time defaults have changed that make dropbear somewhat
bigger we introduce a new option to optimize dropbear for size.
Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
The recent conversion to new-style hooks didn't actually enable the
xauth tweaking. Also rename to FIX_XAUTH as it just tweaks the path,
it doesn't disable anything.
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
Add option to disable reverse DNS lookups on client connection, as
connections otherwise stall until DNS times out in configurations without
working reverse DNS.
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
Configure misdetects this as no, but the result is not used for anything.
Unfortunately it breaks the build for other packages also checking for
struct sockaddr_storage (like rsync) when using a shared config cache,
so force it to yes.
Reported-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
A C library will have been built by the toolchain makefiles, so there is no
need for packages to explicitly depend on uclibc.
Signed-off-by: Will Newton <will.newton@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
The patch introduced at c579e32dbe was
incorrect, since __USE_GNU is an internal C library defined, and
should not be used by programs. _GNU_SOURCE should be used instead.
This fixes a build failure on Dropbear when compiling against a
glibc-based toolchain.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
The -D option to install only works portably when the destination is
a file. Specifying the filename avoids the following build error (at
least on some hosts):
"/usr/bin/install: cannot overwrite directory `/tmp/buildroot/
project_build_foobar/uclibc/root/etc/init.d' with non-directory"
Signed-off-by: Marc Gauthier <marc@tensilica.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
