dropbear generates its keys at the first connection, and wants to save
them in /etc/dropbear (not configurable).
Currently, our /etc/dropbear is a directory.
When the filesystem is read-only, dropbear can't save its keys, so
refuses all connections.
Fix that with:
- at build time, create /etc/dropbear as a symlink to
/var/run/dropbear
- at runtime, if the filesystem is RW (we can rm /etc/dropbear),
we replace the symlink with an actual directory; otherwise,
when the filesystem is RO (we can't rm /etc/dropbear), we create
/var/run/dropbear so the symlink points to an existing directory
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Arnout Vandecappelle <arnout@mind.be>
Cc: Maxime Hadjinlian <maxime.hadjinlian@gmail.com>
Acked-by: "Maxime Hadjinlian" <maxime.hadjinlian@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
The place for package-provided systemd units is /lib/systemd/system.
/etc/systemd/system is for custom units.
Reviewed-by: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
v2: only offer option to disable building SSH client.
do not offer options to disable password authentication and TCP forwarding.
Signed-off-by: Floris Bos <bos@je-eigen-domein.nl>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Switch sed options around since defaults have changed.
Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Since a while, the semantic of BR2_PREFER_STATIC_LIB has been changed
from "prefer static libraries when possible" to "use only static
libraries". The former semantic didn't make much sense, since the user
had absolutely no control/idea of which package would use static
libraries, and which packages would not. Therefore, for quite some
time, we have been starting to enforce that BR2_PREFER_STATIC_LIB
should really build everything with static libraries.
As a consequence, this patch renames BR2_PREFER_STATIC_LIB to
BR2_STATIC_LIBS, and adjust the Config.in option accordingly.
This also helps preparing the addition of other options to select
shared, shared+static or just static.
Note that we have verified that this commit can be reproduced by
simply doing a global rename of BR2_PREFER_STATIC_LIB to
BR2_STATIC_LIBS plus adding BR2_PREFER_STATIC_LIB to Config.in.legacy.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
test a == b is not available in e.g. dash.
Command(s) used for editing:
q=\[\"\'\]
operand="${q}?[$]?[a-zA-Z0-9_\?]+${q}?" ## doesn't detect ${VAR}
test_expr="(\[\s+${operand}\s+)==(\s+${operand}\s+\])"
find . -type f -name '[SK][0-9][0-9]*' | \
xargs sed -r -e "s@${test_expr}@\1=\2@g" -i
Signed-off-by: André Erdmann <dywi@mailerd.de>
Acked-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
To be consistent with the recent change of FOO_MAKE_OPT into FOO_MAKE_OPTS,
make the same change for FOO_CONF_OPT.
Sed command used:
find * -type f | xargs sed -i 's#_CONF_OPT\>#&S#g'
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>
Fixes some regressions introduced by 2014.64
Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
The current SysV startup script create a directory which is necessary
for dropbear to correctly work.
This creation is not done with systemd.
Instead of both init creating the directory, we add the creation of this
directory to the INSTALL_TARGET_CMDS to make sure it's present.
[Peter: use make syntax for TARGET_DIR as pointed out by Thomas]
Signed-off-by: Maxime Hadjinlian <maxime.hadjinlian@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Fixes a number of issues. From the changelog:
- Avoid getting stuck in a loop writing huge key files, reported by Bruno
Thomsen
- Avoid crash on exit due to cleaned up keys before last packets are sent,
debugged by Ronald Wahl
- Fix a race condition in rekeying where Dropbear would exit if it received a
still-in-flight packet after initiating rekeying. Reported by Oliver Metz.
This is a longstanding bug but is triggered more easily since 2013.57
- Ensure that generated RSA keys are always exactly the length
requested. Previously Dropbear always generated N+16 or N+15 bit keys.
Thanks to Unit 193
- Fix DROPBEAR_CLI_IMMEDIATE_AUTH mode which saves a network round trip if the
first public key succeeds. Still not enabled by default, needs more
compatibility testing with other implementations.
- Fix signal handlers so that errno is saved, thanks to Erik Ahlén for a patch
and Mark Wickham for independently spotting the same problem.
And at the same time get rid of the TIMEVAL_TO_TIMESPEC as dropbear provides a
fallback implementation if not available (and has done so since 2006).
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
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>
