dropbear: server support option '-T' max auth tries
[openwrt/openwrt.git] / package / network / services / dropbear / files / dropbear.init
1 #!/bin/sh /etc/rc.common
2 # Copyright (C) 2006-2010 OpenWrt.org
3 # Copyright (C) 2006 Carlos Sobrinho
4
5 START=50
6 STOP=50
7
8 USE_PROCD=1
9 PROG=/usr/sbin/dropbear
10 NAME=dropbear
11 PIDCOUNT=0
12 EXTRA_COMMANDS="killclients"
13 EXTRA_HELP=" killclients Kill ${NAME} processes except servers and yourself"
14
15 append_ports()
16 {
17 local ipaddrs="$1"
18 local port="$2"
19
20 [ -z "$ipaddrs" ] && {
21 procd_append_param command -p "$port"
22 return
23 }
24
25 for addr in $ipaddrs; do
26 procd_append_param command -p "$addr:$port"
27 done
28 }
29
30 validate_section_dropbear()
31 {
32 uci_validate_section dropbear dropbear "${1}" \
33 'PasswordAuth:bool:1' \
34 'enable:bool:1' \
35 'Interface:string' \
36 'GatewayPorts:bool:0' \
37 'RootPasswordAuth:bool:1' \
38 'RootLogin:bool:1' \
39 'rsakeyfile:file' \
40 'BannerFile:file' \
41 'Port:list(port):22' \
42 'SSHKeepAlive:uinteger:300' \
43 'IdleTimeout:uinteger:0' \
44 'mdns:bool:1'
45 }
46
47 dropbear_instance()
48 {
49 local PasswordAuth enable Interface GatewayPorts \
50 RootPasswordAuth RootLogin rsakeyfile \
51 BannerFile Port SSHKeepAlive IdleTimeout \
52 mdns ipaddrs
53
54 validate_section_dropbear "${1}" || {
55 echo "validation failed"
56 return 1
57 }
58
59 [ -n "${Interface}" ] && {
60 network_get_ipaddrs_all ipaddrs "${Interface}" || {
61 echo "interface ${Interface} has no physdev or physdev has no suitable ip"
62 return 1
63 }
64 }
65
66 [ "${enable}" = "0" ] && return 1
67 PIDCOUNT="$(( ${PIDCOUNT} + 1))"
68 local pid_file="/var/run/${NAME}.${PIDCOUNT}.pid"
69
70 procd_open_instance
71 procd_set_param command "$PROG" -F -P "$pid_file"
72 [ "${PasswordAuth}" -eq 0 ] && procd_append_param command -s
73 [ "${GatewayPorts}" -eq 1 ] && procd_append_param command -a
74 [ "${RootPasswordAuth}" -eq 0 ] && procd_append_param command -g
75 [ "${RootLogin}" -eq 0 ] && procd_append_param command -w
76 [ -n "${rsakeyfile}" ] && procd_append_param command -r "${rsakeyfile}"
77 [ -n "${BannerFile}" ] && procd_append_param command -b "${BannerFile}"
78 append_ports "${ipaddrs}" "${Port}"
79 [ "${IdleTimeout}" -ne 0 ] && procd_append_param command -I "${IdleTimeout}"
80 [ "${SSHKeepAlive}" -ne 0 ] && procd_append_param command -K "${SSHKeepAlive}"
81 [ "${mdns}" -ne 0 ] && procd_add_mdns "ssh" "tcp" "$Port" "daemon=dropbear"
82 procd_set_param respawn
83 procd_close_instance
84 }
85
86 keygen()
87 {
88 for keytype in rsa; do
89 # check for keys
90 key=dropbear/dropbear_${keytype}_host_key
91 [ -f /tmp/$key -o -s /etc/$key ] || {
92 # generate missing keys
93 mkdir -p /tmp/dropbear
94 [ -x /usr/bin/dropbearkey ] && {
95 /usr/bin/dropbearkey -t $keytype -f /tmp/$key 2>&- >&- && exec /etc/rc.common "$initscript" start
96 } &
97 exit 0
98 }
99 done
100
101 lock /tmp/.switch2jffs
102 mkdir -p /etc/dropbear
103 mv /tmp/dropbear/dropbear_* /etc/dropbear/
104 lock -u /tmp/.switch2jffs
105 chown root /etc/dropbear
106 chmod 0700 /etc/dropbear
107 }
108
109 load_interfaces()
110 {
111 config_get interface "$1" Interface
112 config_get enable "$1" enable 1
113
114 [ "${enable}" = "1" ] && interfaces=" ${interface} ${interfaces}"
115 }
116
117 start_service()
118 {
119 [ -s /etc/dropbear/dropbear_rsa_host_key ] || keygen
120
121 . /lib/functions.sh
122 . /lib/functions/network.sh
123
124 config_load "${NAME}"
125 config_foreach dropbear_instance dropbear
126 }
127
128 service_triggers()
129 {
130 local interfaces
131
132 procd_add_config_trigger "config.change" "dropbear" /etc/init.d/dropbear reload
133
134 config_load "${NAME}"
135 config_foreach load_interfaces dropbear
136
137 [ -n "${interfaces}" ] && {
138 for n in $interfaces ; do
139 procd_add_interface_trigger "interface.*" $n /etc/init.d/dropbear reload
140 done
141 }
142
143 procd_add_validation validate_section_dropbear
144 }
145
146 killclients()
147 {
148 local ignore=''
149 local server
150 local pid
151
152 # if this script is run from inside a client session, then ignore that session
153 pid="$$"
154 while [ "${pid}" -ne 0 ]
155 do
156 # get parent process id
157 pid=`cut -d ' ' -f 4 "/proc/${pid}/stat"`
158 [ "${pid}" -eq 0 ] && break
159
160 # check if client connection
161 grep -F -q -e "${PROG}" "/proc/${pid}/cmdline" && {
162 append ignore "${pid}"
163 break
164 }
165 done
166
167 # get all server pids that should be ignored
168 for server in `cat /var/run/${NAME}.*.pid`
169 do
170 append ignore "${server}"
171 done
172
173 # get all running pids and kill client connections
174 local skip
175 for pid in `pidof "${NAME}"`
176 do
177 # check if correct program, otherwise process next pid
178 grep -F -q -e "${PROG}" "/proc/${pid}/cmdline" || {
179 continue
180 }
181
182 # check if pid should be ignored (servers, ourself)
183 skip=0
184 for server in ${ignore}
185 do
186 if [ "${pid}" = "${server}" ]
187 then
188 skip=1
189 break
190 fi
191 done
192 [ "${skip}" -ne 0 ] && continue
193
194 # kill process
195 echo "${initscript}: Killing ${pid}..."
196 kill -KILL ${pid}
197 done
198 }