sshd revision 240336 
1#!/bin/sh
2#
3# $FreeBSD: head/etc/rc.d/sshd 240336 2012-09-11 05:04:59Z obrien $
4#
5
6# PROVIDE: sshd
7# REQUIRE: LOGIN FILESYSTEMS
8# KEYWORD: shutdown
9
10. /etc/rc.subr
11
12name="sshd"
13rcvar="sshd_enable"
14command="/usr/sbin/${name}"
15keygen_cmd="sshd_keygen"
16start_precmd="sshd_precmd"
17configtest_cmd="sshd_configtest"
18pidfile="/var/run/${name}.pid"
19extra_commands="configtest keygen reload"
20
21timeout=300
22
23user_reseed()
24{
25	(
26	seeded=`sysctl -n kern.random.sys.seeded 2>/dev/null`
27	if [ "x${seeded}" != "x" ] && [ ${seeded} -eq 0 ] ; then
28		warn "Setting entropy source to blocking mode."
29		echo "===================================================="
30		echo "Type a full screenful of random junk to unblock"
31		echo "it and remember to finish with <enter>. This will"
32		echo "timeout in ${timeout} seconds, but waiting for"
33		echo "the timeout without typing junk may make the"
34		echo "entropy source deliver predictable output."
35		echo ""
36		echo "Just hit <enter> for fast+insecure startup."
37		echo "===================================================="
38		sysctl kern.random.sys.seeded=0 2>/dev/null
39		read -t ${timeout} junk
40		echo "${junk}" `sysctl -a` `date` > /dev/random
41	fi
42	)
43}
44
45sshd_keygen()
46{
47	(
48	umask 022
49
50	# Can't do anything if ssh is not installed
51	[ -x /usr/bin/ssh-keygen ] || {
52		warn "/usr/bin/ssh-keygen does not exist."
53		return 1
54	}
55
56	if [ -f /etc/ssh/ssh_host_key ]; then
57		echo "You already have an RSA host key" \
58		    "in /etc/ssh/ssh_host_key"
59		echo "Skipping protocol version 1 RSA Key Generation"
60	else
61		/usr/bin/ssh-keygen -t rsa1 -b 1024 \
62		    -f /etc/ssh/ssh_host_key -N ''
63	fi
64
65	if [ -f /etc/ssh/ssh_host_dsa_key ]; then
66		echo "You already have a DSA host key" \
67		    "in /etc/ssh/ssh_host_dsa_key"
68		echo "Skipping protocol version 2 DSA Key Generation"
69	else
70		/usr/bin/ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_key -N ''
71	fi
72
73	if [ -f /etc/ssh/ssh_host_rsa_key ]; then
74		echo "You already have an RSA host key" \
75		    "in /etc/ssh/ssh_host_rsa_key"
76		echo "Skipping protocol version 2 RSA Key Generation"
77	else
78		/usr/bin/ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key -N ''
79	fi
80
81	if [ -f /etc/ssh/ssh_host_ecdsa_key ]; then
82		echo "You already have an ECDSA host key" \
83		    "in /etc/ssh/ssh_host_ecdsa_key"
84		echo "Skipping protocol version 2 ECDSA Key Generation"
85	else
86		/usr/bin/ssh-keygen -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key -N ''
87	fi
88	)
89}
90
91sshd_configtest()
92{
93	echo "Performing sanity check on ${name} configuration."
94	eval ${command} ${sshd_flags} -t
95}
96
97sshd_precmd()
98{
99	if [ ! -f /etc/ssh/ssh_host_key -o \
100	    ! -f /etc/ssh/ssh_host_dsa_key -o \
101	    ! -f /etc/ssh/ssh_host_ecdsa_key -o \
102	    ! -f /etc/ssh/ssh_host_rsa_key ]; then
103		user_reseed
104		run_rc_command keygen
105	fi
106	sshd_configtest
107}
108
109load_rc_config $name
110run_rc_command "$1"
111