Mercurial > dropbear
annotate debian/dropbear.postinst @ 1861:2b3a8026a6ce
Add re-exec for server
This allows ASLR to re-randomize the address
space for every connection, preventing some
vulnerabilities from being exploitable by
repeated probing.
Overhead (memory and time) is yet to be confirmed.
At present this is only enabled on Linux. Other BSD platforms
with fexecve() would probably also work though have not been tested.
| author | Matt Johnston <matt@ucc.asn.au> |
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| date | Sun, 30 Jan 2022 10:14:56 +0800 |
| parents | 7fc4ba3c1cbb |
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| rev | line source |
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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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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 |
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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' && |
| 516 | 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 |