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annotate debian/dropbear.postinst @ 1672:3a97f14c0235

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Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93) * Add Chacha20-Poly1305 authenticated encryption * Add general AEAD approach. * Add [email protected] 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 [email protected] and [email protected] 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
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Mon, 25 May 2020 20:50:25 +0500
parents 7fc4ba3c1cbb
children
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1 #!/bin/sh
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2 set -e
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3
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4 test "$1" = 'configure' || exit 0
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5
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6 if test ! -e /etc/dropbear/dropbear_rsa_host_key; then
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7 if test -f /etc/ssh/ssh_host_rsa_key; then
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8 echo "Converting existing OpenSSH RSA host key to Dropbear format."
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9 /usr/lib/dropbear/dropbearconvert openssh dropbear \
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10 /etc/ssh/ssh_host_rsa_key /etc/dropbear/dropbear_rsa_host_key
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11 else
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12 echo "Generating Dropbear RSA key. Please wait."
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13 dropbearkey -t rsa -f /etc/dropbear/dropbear_rsa_host_key
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14 fi
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15 fi
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16 if test ! -e /etc/dropbear/dropbear_dss_host_key; then
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17 if test -f /etc/ssh/ssh_host_dsa_key; then
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18 echo "Converting existing OpenSSH RSA host key to Dropbear format."
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19 /usr/lib/dropbear/dropbearconvert openssh dropbear \
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20 /etc/ssh/ssh_host_dsa_key /etc/dropbear/dropbear_dss_host_key
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21 else
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22 echo "Generating Dropbear DSS key. Please wait."
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23 dropbearkey -t dss -f /etc/dropbear/dropbear_dss_host_key
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24 fi
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25 fi
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26 if test ! -s /etc/default/dropbear; then
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27 # check whether OpenSSH seems to be installed.
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28 if test -x /usr/sbin/sshd; then
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29 cat <<EOT
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30 OpenSSH appears to be installed. Setting /etc/default/dropbear so that
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31 Dropbear will not start by default. Edit this file to change this behaviour.
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32
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33 EOT
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34 cat >>/etc/default/dropbear <<EOT
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35 # disabled because OpenSSH is installed
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36 # change to NO_START=0 to enable Dropbear
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37 NO_START=1
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38
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39 EOT
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40 fi
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41 cat >>/etc/default/dropbear <<EOT
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42 # the TCP port that Dropbear listens on
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43 DROPBEAR_PORT=22
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44
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45 # any additional arguments for Dropbear
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46 DROPBEAR_EXTRA_ARGS=
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47
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48 # specify an optional banner file containing a message to be
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49 # sent to clients before they connect, such as "/etc/issue.net"
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50 DROPBEAR_BANNER=""
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51
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52 # RSA hostkey file (default: /etc/dropbear/dropbear_rsa_host_key)
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53 #DROPBEAR_RSAKEY="/etc/dropbear/dropbear_rsa_host_key"
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54
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55 # DSS hostkey file (default: /etc/dropbear/dropbear_dss_host_key)
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56 #DROPBEAR_DSSKEY="/etc/dropbear/dropbear_dss_host_key"
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c23c7f0f594c Use the -W <windowsize> argument in startup scripts, with a default of 64kB
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57
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58 # Receive window size - this is a tradeoff between memory and
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59 # network performance
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60 DROPBEAR_RECEIVE_WINDOW=65536
70
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61 EOT
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62 fi
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63
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64 if test -x /etc/init.d/dropbear; then
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65 update-rc.d dropbear defaults >/dev/null
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66 if test -x /usr/sbin/invoke-rc.d; then
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67 invoke-rc.d dropbear restart
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68 else
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69 /etc/init.d/dropbear restart
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70 fi
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71 fi
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72
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73 if test -n "$2" && dpkg --compare-versions "$2" lt '0.50-4' &&
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74 update-service --check dropbear 2>/dev/null; then
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75 update-service --remove /etc/dropbear 2>/dev/null || :
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76 sleep 6
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77 rm -rf /var/run/dropbear /var/run/dropbear.log
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78 update-service --add /etc/dropbear || :
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79 fi