these options allow one to configure U2F/FIDO support in more granular way
inspired by upstream commit aa6559db
Signed-off-by: Konstantin Demin <rockdrilla@gmail.com>
reduces binary/package size and increases overall performance
also:
- adjust 910-signkey-fix-use-of-rsa-sha2-256-pubkeys.patch
to build without DROPBEAR_RSA/DROPBEAR_RSA_SHA256
Signed-off-by: Konstantin Demin <rockdrilla@gmail.com>
- "default n" is not needed: options are not selected by default
- wrap config on 80 characters width (assuming tab is 8 characters long)
- add feature cost size and security notes for DROPBEAR_AGENTFORWARD
and DROPBEAR_DBCLIENT_AGENTFORWARD:
describe why and where it should be disabled
Signed-off-by: Konstantin Demin <rockdrilla@gmail.com>
* SSH agent forwarding might cause security issues, locally and on the jump
machine (https://defn.io/2019/04/12/ssh-forwarding/). So allow to
completely disabling it.
* separate options for client and server
* keep it enabled by default
Signed-off-by: Sven Roederer <devel-sven@geroedel.de>
binary size cost is much less than 1k.
tested on ath79/generic:
bin: 215128 -> 215132 (+4b)
ipk: 111183 -> 111494 (+311b)
Signed-off-by: Konstantin Demin <rockdrilla@gmail.com>
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>
- 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>
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>
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>
