The Ed25519 key pairs are much shorter than RSA pairs and are supported
by default in OpenSSH. Looking at websites explaining how to create new
SSH keys, many suggest using Ed25519 rather than RSA, however consider
the former as not yet widely established. OpenWrt likely has a positive
influence on that development.
As enabling Ed25519 is a compile time option, it is currently not
possible to install the feature via `opkg` nor select that option in an
ImageBuilder.
Due to the size impact of **12kB** the option should only be enabled for
devices with `!SMALL_FLASH`.
This approach seems cleaner than splitting `dropbear` into two packages
like `dropbear` and `dropbear-ed25519`.
Signed-off-by: Paul Spooren <mail@aparcar.org>
If not needed, disabling scp allows for a nice size reduction.
Dropbear executable size comparison:
153621 bytes (baseline)
133077 bytes (without scp)
In other words, we trim a total of 20544 bytes.
Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>
The ssh symlink was still being created even when dbclient was disabled in the
build configuration. Fix this annoyance.
Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>
- drop patches (applied upstream):
* 010-backport-change-address-logging.patch
* 020-backport-ed25519-support.patch
* 021-backport-chacha20-poly1305-support.patch
- backport patches:
* 010-backport-disable-toom-and-karatsuba.patch:
reduce dropbear binary size (about ~8Kb).
- refresh patches.
- don't bother anymore with following config options
because they are disabled in upstream too:
* DROPBEAR_3DES
* DROPBEAR_ENABLE_CBC_MODE
* DROPBEAR_SHA1_96_HMAC
- explicitly disable DO_MOTD as it was before commit a1099ed:
upstream has (accidentally) switched it to 0 in release 2019.77,
but reverted back in release 2020.79.
Signed-off-by: Konstantin Demin <rockdrilla@gmail.com>
201e359 Handle early exit when addrstring isn't set
fa4c464 Improve address logging on early exit messages (#83)
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
The sender domain has a DMARC Reject/Quarantine policy which disallows
sending mailing list messages using the original "From" header.
To mitigate this problem, the original message has been wrapped
automatically by the mailing list software.
Failsafe code of dropbear should be in the dropbear package not the
base-files package.
Signed-off-by: Kyle Copperfield <kmcopper@danwin1210.me>
This activates PIE ASLR support by default when the regular option is
selected.
This increases the binary size by 18% uncompressed and 17% compressed
on MIPS BE.
old:
164,261 /usr/sbin/dropbear
85,648 dropbear_2019.78-2_mips_24kc.ipk
new:
194,492 /usr/sbin/dropbear
100,309 dropbear_2019.78-2_mips_24kc.ipk
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Acked-by: Petr Štetiar <ynezz@true.cz>
If CONFIG_DROPBEAR_ZLIB is set, building fails at the packaging stage
due to an undeclared dependency on libz.so.1.
As is already done for the main dropbear package, conditionally add a
dependency on zlib.
Signed-off-by: Matt Merhar <mattmerhar@protonmail.com>
Required as dependency on dropbear config headers is not tracked in
dropbear build system
Fixes FS#2275
Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>
Fix dbclient regression in 2019.77. After exiting the terminal would be left
in a bad state. Reported by Ryan Woodsmall
drop patch applied upstream:
010-tty-modes-werent-reset-for-client.patch
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
- limit ECC support to ec*-sha2-nistp256:
* DROPBEAR_ECC now provides only basic support for ECC
- provide full ECC support as an option:
* DROPBEAR_ECC_FULL brings back support for ec{dh,dsa}-sha2-nistp{384,521}
- update feature costs in binary size
Signed-off-by: Konstantin Demin <rockdrilla@gmail.com>
Interface triggers are installed by the dropbear init script in case an
interface is configured for a given dropbear uci section.
As dropbear is started after network the interface trigger event can be
missed during a small window; this is especially the case if lan is
specified as interface.
Fix this by starting dropbear before network so no interface trigger
is missed. As dropbear is started earlier than netifd add a boot function
to avoid the usage of network.sh functions as call to such functions will
fail at boottime.
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
Acked-by: Jo-Philipp Wich <jo@mein.io>
CVE description :
The recv_msg_userauth_request function in svr-auth.c in Dropbear through
2018.76 is prone to a user enumeration vulnerability because username
validity affects how fields in SSH_MSG_USERAUTH messages are handled,
a similar issue to CVE-2018-15473 in an unrelated codebase.
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
As MD5 is known weak for many years and more and more
penetration test tools complain about enabled MD5 HMAC
I think it's time to drop it.
By disabling the MD5 HMAC support dropbear will also
automatically use SHA1 for fingerprints.
This shouldn't be a problem too.
Signed-off-by: Martin Schiller <ms@dev.tdt.de>
CPE ids helps to tracks CVE in packages.
https://cpe.mitre.org/specification/
Thanks to swalker for CPE to package mapping and
keep tracking CVEs.
Acked-by: Jo-Philipp Wich <jo@mein.io>
Signed-off-by: Alexander Couzens <lynxis@fe80.eu>
Adds config option to enable compression support which is usefull
when using a terminal sessions over a slow link. Impact on binary
size is negligible but additional 60 kB (uncompressed) is needed for
a shared zlib library.
Signed-off-by: Marcin Jurkowski <marcin1j@gmail.com>
ssh and scp commands interfere with OpenSSH when installed in /usr/bin .
One use case is when installing dropbear to get root access when only OpenSSH is available (OpenSSH disallows root password logins). Once dropbear installs, it replaces OpenSSH's executables, even when removed with opkg. OpenSSH must be reinstalled to get them back.
Signed-off-by: Rosen Penev <rosenp@gmail.com>
Add a uci option to set the new max auth tries paramater in dropbear.
Set the default to 3, as 10 seems excessive.
Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
- Security: Fix double-free in server TCP listener cleanup A double-free
in the server could be triggered by an authenticated user if dropbear is
running with -a (Allow connections to forwarded ports from any host)
This could potentially allow arbitrary code execution as root by an
authenticated user. Affects versions 2013.56 to 2016.74. Thanks to Mark
Shepard for reporting the crash.
CVE-2017-9078 https://secure.ucc.asn.au/hg/dropbear/rev/c8114a48837c
- Security: Fix information disclosure with ~/.ssh/authorized_keys
symlink. Dropbear parsed authorized_keys as root, even if it were a
symlink. The fix is to switch to user permissions when opening
authorized_keys
A user could symlink their ~/.ssh/authorized_keys to a root-owned file
they couldn't normally read. If they managed to get that file to contain
valid authorized_keys with command= options it might be possible to read
other contents of that file.
This information disclosure is to an already authenticated user.
Thanks to Jann Horn of Google Project Zero for reporting this.
CVE-2017-9079 https://secure.ucc.asn.au/hg/dropbear/rev/0d889b068123
Refresh patches, rework 100-pubkey_path.patch to work with new
authorized_keys validation.
Signed-off-by: Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk>
Harmonise handling of DEFAULT_PATH by removing the patch introducing #ifndef
guards around the path, and only using one means to set the path in the
makefile.
Signed-off-by: Dario Ernst <Dario.Ernst@riverbed.com>
Configurations without shadow passwords have been broken since the removal
of telnet: as the default entry in /etc/passwd is not empty (but rather
unset), there will be no way to log onto such a system by default. As
disabling shadow passwords is not useful anyways, remove this configuration
option.
The config symbol is kept (for a while), as packages from feeds depend on
it.
Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>
As security precaution and to limit the attack surface based on
the version reported by tools like nmap mask out the dropbear
version so the version is not visible anymore by snooping on the
wire. Version is still visible by 'dropbear -V'
Based on a patch by Hans Dedecker <dedeckeh@gmail.com>
Signed-off-by: Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk>
Signed-off-by: Felix Fietkau <nbd@nbd.name> [remove trailing _]
- Security: Message printout was vulnerable to format string injection.
If specific usernames including "%" symbols can be created on a system
(validated by getpwnam()) then an attacker could run arbitrary code as root
when connecting to Dropbear server.
A dbclient user who can control username or host arguments could potentially
run arbitrary code as the dbclient user. This could be a problem if scripts
or webpages pass untrusted input to the dbclient program.
- Security: dropbearconvert import of OpenSSH keys could run arbitrary code as
the local dropbearconvert user when parsing malicious key files
- Security: dbclient could run arbitrary code as the local dbclient user if
particular -m or -c arguments are provided. This could be an issue where
dbclient is used in scripts.
- Security: dbclient or dropbear server could expose process memory to the
running user if compiled with DEBUG_TRACE and running with -v
The security issues were reported by an anonymous researcher working with
Beyond Security's SecuriTeam Secure Disclosure www.beyondsecurity.com/ssd.html
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
Fix a „semantic typo“ introduced in b78aae793e,
where TARGET_INIT_PATH was used instead of CONFIG_TARGET_INIT_PATH.
Signed-off-by: Dario Ernst <Dario.Ernst@riverbed.com>
Update the dropbear package to version 2016.73, refresh patches.
The measured .ipk sizes on an x86_64 build are:
94588 dropbear_2015.71-3_x86_64.ipk
95316 dropbear_2016.73-1_x86_64.ipk
This is an increase of roughly 700 bytes after compression.
Tested-by: Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk>
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
The option --disable-utmpx was deleted by accident in commit 7545c1d;
add it again to the CONFIGURE_ARGS list
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
A dropbear instance having an interface config won't start if the interface is down as no
IP address is available.
Adding interface triggers for each configured interface executing the dropbear reload script
will start the dropbear instance when the interface is up.
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
Utmp support tracks who is currenlty logged in by logging info to the file /var/run/utmp (supported by busybox)
Putuline support will use the utmp structure to write to the utmp file
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
This enables passworldless login for root via SSH whenever no root
password is set (e.g. after reset, flashing without keeping config
or in failsafe) and removes telnet support alltogether.
Signed-off-by: Steven Barth <steven@midlink.org>
SVN-Revision: 46809
