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2021-03-02Disable UNAUTH_CLOSE_DELAY by defaultMatt Johnston
2017-02-15Introduce extra delay before closing unauthenticated sessionsThomas De Schampheleire
To make it harder for attackers, introduce a delay to keep an unauthenticated session open a bit longer, thus blocking a connection slot until after the delay. Without this, while there is a limit on the amount of attempts an attacker can make at the same time (MAX_UNAUTH_PER_IP), the time taken by dropbear to handle one attempt is still short and thus for each of the allowed parallel attempts many attempts can be chained one after the other. The attempt rate is then: "MAX_UNAUTH_PER_IP / <process time of one attempt>". With the delay, this rate becomes: "MAX_UNAUTH_PER_IP / UNAUTH_CLOSE_DELAY".
2020-06-11Disable by default 3des, cbc, hmac-sha1-96, x11 forwardingMatt Johnston
2020-06-10Remove blowfishMatt Johnston
2020-05-25Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)Vladislav Grishenko
* Add Chacha20-Poly1305 authenticated encryption * Add general AEAD approach. * Add chacha20-poly1305@openssh.com algo using LibTomCrypt chacha and poly1305 routines. Chacha20-Poly1305 is generally faster than AES256 on CPU w/o dedicated AES instructions, having the same key size. Compiling in will add ~5,5kB to binary size on x86-64. function old new delta chacha_crypt - 1397 +1397 _poly1305_block - 608 +608 poly1305_done - 595 +595 dropbear_chachapoly_crypt - 457 +457 .rodata 26976 27392 +416 poly1305_process - 290 +290 poly1305_init - 221 +221 chacha_setup - 218 +218 encrypt_packet 1068 1270 +202 dropbear_chachapoly_getlength - 147 +147 decrypt_packet 756 897 +141 chacha_ivctr64 - 137 +137 read_packet 543 637 +94 dropbear_chachapoly_start - 94 +94 read_kex_algos 792 880 +88 chacha_keystream - 69 +69 dropbear_mode_chachapoly - 48 +48 sshciphers 280 320 +40 dropbear_mode_none 24 48 +24 dropbear_mode_ctr 24 48 +24 dropbear_mode_cbc 24 48 +24 dropbear_chachapoly_mac - 24 +24 dropbear_chachapoly - 24 +24 gen_new_keys 848 854 +6 ------------------------------------------------------------------------------ (add/remove: 14/0 grow/shrink: 10/0 up/down: 5388/0) Total: 5388 bytes * Add AES128-GCM and AES256-GCM authenticated encryption * Add general AES-GCM mode. * Add aes128-gcm@openssh.com and aes256-gcm@openssh.com algo using LibTomCrypt gcm routines. AES-GCM is combination of AES CTR mode and GHASH, slower than AES-CTR on CPU w/o dedicated AES/GHASH instructions therefore disabled by default. Compiling in will add ~6kB to binary size on x86-64. function old new delta gcm_process - 1060 +1060 .rodata 26976 27808 +832 gcm_gf_mult - 820 +820 gcm_add_aad - 660 +660 gcm_shift_table - 512 +512 gcm_done - 471 +471 gcm_add_iv - 384 +384 gcm_init - 347 +347 dropbear_gcm_crypt - 309 +309 encrypt_packet 1068 1270 +202 decrypt_packet 756 897 +141 gcm_reset - 118 +118 read_packet 543 637 +94 read_kex_algos 792 880 +88 sshciphers 280 360 +80 gcm_mult_h - 80 +80 dropbear_gcm_start - 62 +62 dropbear_mode_gcm - 48 +48 dropbear_mode_none 24 48 +24 dropbear_mode_ctr 24 48 +24 dropbear_mode_cbc 24 48 +24 dropbear_ghash - 24 +24 dropbear_gcm_getlength - 24 +24 gen_new_keys 848 854 +6 ------------------------------------------------------------------------------ (add/remove: 14/0 grow/shrink: 10/0 up/down: 6434/0) Total: 6434 bytes
2020-03-14MOTD enabled by default as the manpage says (#87)zciendor
The man page (https://github.com/mkj/dropbear/blob/master/dropbear.8) says MOTD will be printed by default for any login shell, but it was disabled at compile time. Probably happened by accident when this code was moved from `options.h` to `default_options.h`.
2020-03-12Add Ed25519 support (#91)Vladislav Grishenko
* Add support for Ed25519 as a public key type Ed25519 is a elliptic curve signature scheme that offers better security than ECDSA and DSA and good performance. It may be used for both user and host keys. OpenSSH key import and fuzzer are not supported yet. Initially inspired by Peter Szabo. * Add curve25519 and ed25519 fuzzers * Add import and export of Ed25519 keys
2019-03-20Add a sanity check for DROPBEAR_SVR_MULTIUSER==0 modeMatt Johnston
2019-03-20Support servers without multiple user support (#76)Patrick Stewart
2018-03-01mention localoptions.h being build directory, fix underscore in CHANGESMatt Johnston
2018-02-26make group1 client-onlyMatt Johnston
2018-02-26disable group1 in default configMatt Johnston
2018-02-19- Fix dependencies and remove old default_options.h from version controlMatt Johnston
- Rename default_options.h.in -> default_options.h, and default_options.h -> default_options_guard.h - Fix newlines in default_options.h
2018-02-18missed regeneratingMatt Johnston
2018-02-18rename some options and move some to sysoptions.hMatt Johnston
2018-02-14update default_options.hMatt Johnston
2017-06-27Use MAX_AUTH_TRIES rather than DEFAULT_AUTH_TRIES, don't limit argument rangeMatt Johnston
2017-06-25dropbear server: support -T max auth triesKevin Darbyshire-Bryant
Add support for '-T n' for a run-time specification for maximum number of authentication attempts where 'n' is between 1 and compile time option MAX_AUTH_TRIES. A default number of tries can be specified at compile time using 'DEFAULT_AUTH_TRIES' which itself defaults to MAX_AUTH_TRIES for backwards compatibility. Signed-off-by: Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk>
2017-06-24add configuration option for default RSA size.Matt Johnston
print key size with dropbearkey
2016-05-04Add generated header default_options.h to version control.Matt Johnston
This is a workaround since I cannot figure how to get dependencies to work properly with "make -j"
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 10:48:32 +0000