annotate dropbear.8 @ 1053:fd3712d1ff7f

Better failure handling
author Matt Johnston <matt@ucc.asn.au>
date Sat, 28 Feb 2015 23:49:39 +0800
parents 17d874ae93a1
children 3c8403f4669d
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1 .TH dropbear 8
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2 .SH NAME
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3 dropbear \- lightweight SSH server
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4 .SH SYNOPSIS
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5 .B dropbear
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6 [\-RFEmwsgjki] [\-b
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7 .I banner\fR]
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8 [\-r
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9 .I hostkeyfile\fR] [\-p
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10 .IR [address:]port ]
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11 .SH DESCRIPTION
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12 .B dropbear
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13 is a small SSH server
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14 .SH OPTIONS
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15 .TP
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16 .B \-b \fIbanner
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17 bannerfile.
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18 Display the contents of the file
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19 .I banner
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20 before user login (default: none).
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21 .TP
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22 .B \-r \fIhostkey
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23 Use the contents of the file
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24 .I hostkey
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25 for the SSH hostkey.
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26 This file is generated with
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27 .BR dropbearkey (1)
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28 or automatically with the '-R' option. See "Host Key Files" below.
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29 .TP
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30 .B \-R
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31 Generate hostkeys automatically. See "Host Key Files" below.
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32 .TP
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33 .B \-F
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34 Don't fork into background.
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35 .TP
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36 .B \-E
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37 Log to standard error rather than syslog.
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38 .TP
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39 .B \-m
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40 Don't display the message of the day on login.
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41 .TP
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42 .B \-w
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43 Disallow root logins.
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44 .TP
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45 .B \-s
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46 Disable password logins.
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47 .TP
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48 .B \-g
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49 Disable password logins for root.
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50 .TP
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51 .B \-j
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52 Disable local port forwarding.
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53 .TP
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54 .B \-k
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55 Disable remote port forwarding.
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56 .TP
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57 .B \-p \fI[address:]port
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58 Listen on specified
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59 .I address
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60 and TCP
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61 .I port.
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62 If just a port is given listen
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63 on all addresses.
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64 up to 10 can be specified (default 22 if none specified).
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65 .TP
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66 .B \-i
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67 Service program mode.
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68 Use this option to run
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69 .B dropbear
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70 under TCP/IP servers like inetd, tcpsvd, or tcpserver.
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71 In program mode the \-F option is implied, and \-p options are ignored.
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72 .TP
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73 .B \-P \fIpidfile
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74 Specify a pidfile to create when running as a daemon. If not specified, the
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75 default is /var/run/dropbear.pid
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76 .TP
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77 .B \-a
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78 Allow remote hosts to connect to forwarded ports.
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79 .TP
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80 .B \-W \fIwindowsize
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81 Specify the per-channel receive window buffer size. Increasing this
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82 may improve network performance at the expense of memory use. Use -h to see the
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83 default buffer size.
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84 .TP
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85 .B \-K \fItimeout_seconds
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86 Ensure that traffic is transmitted at a certain interval in seconds. This is
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87 useful for working around firewalls or routers that drop connections after
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88 a certain period of inactivity. The trade-off is that a session may be
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89 closed if there is a temporary lapse of network connectivity. A setting
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90 if 0 disables keepalives. If no response is received for 3 consecutive keepalives the connection will be closed.
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91 .TP
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92 .B \-I \fIidle_timeout
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93 Disconnect the session if no traffic is transmitted or received for \fIidle_timeout\fR seconds.
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94 .TP
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95 .B \-V
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96 Print the version
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97
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98 .SH FILES
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99
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100 .TP
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101 Authorized Keys
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102
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103 ~/.ssh/authorized_keys can be set up to allow remote login with a RSA or DSS
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104 key. Each line is of the form
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105 .TP
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106 [restrictions] ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAIgAsp... [comment]
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107
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108 and can be extracted from a Dropbear private host key with "dropbearkey -y". This is the same format as used by OpenSSH, though the restrictions are a subset (keys with unknown restrictions are ignored).
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109 Restrictions are comma separated, with double quotes around spaces in arguments.
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110 Available restrictions are:
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111
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112 .TP
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113 .B no-port-forwarding
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114 Don't allow port forwarding for this connection
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115
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116 .TP
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117 .B no-agent-forwarding
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118 Don't allow agent forwarding for this connection
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119
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120 .TP
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121 .B no-X11-forwarding
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122 Don't allow X11 forwarding for this connection
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123
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124 .TP
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125 .B no-pty
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126 Disable PTY allocation. Note that a user can still obtain most of the
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127 same functionality with other means even if no-pty is set.
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128
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129 .TP
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130 .B command="\fIforced_command\fR"
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131 Disregard the command provided by the user and always run \fIforced_command\fR.
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132
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133 The authorized_keys file and its containing ~/.ssh directory must only be
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134 writable by the user, otherwise Dropbear will not allow a login using public
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135 key authentication.
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136
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137 .TP
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138 Host Key Files
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139
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140 Host key files are read at startup from a standard location, by default
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141 /etc/dropbear/dropbear_dss_host_key, /etc/dropbear/dropbear_rsa_host_key, and
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142 /etc/dropbear/dropbear-ecdsa_host_key
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143 or specified on the commandline with -r. These are of the form generated
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144 by dropbearkey. The -R option can be used to automatically generate keys
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145 in the default location - keys will be generated after startup when the first
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146 connection is established. This had the benefit that the system /dev/urandom
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147 random number source has a better chance of being securely seeded.
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148
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149 .TP
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150 Message Of The Day
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151
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152 By default the file /etc/motd will be printed for any login shell (unless
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153 disabled at compile-time). This can also be disabled per-user
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154 by creating a file ~/.hushlogin .
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155
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156 .SH ENVIRONMENT VARIABLES
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157 Dropbear sets the standard variables USER, LOGNAME, HOME, SHELL, PATH, and TERM.
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158
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159 The variables below are set for sessions as appropriate.
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160
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161 .TP
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162 .B SSH_TTY
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163 This is set to the allocated TTY if a PTY was used.
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164
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165 .TP
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166 .B SSH_CONNECTION
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167 Contains "<remote_ip> <remote_port> <local_ip> <local_port>".
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168
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169 .TP
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170 .B DISPLAY
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171 Set X11 forwarding is used.
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172
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173 .TP
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174 .B SSH_ORIGINAL_COMMAND
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175 If a 'command=' authorized_keys option was used, the original command is specified
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176 in this variable. If a shell was requested this is set to an empty value.
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177
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178 .TP
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179 .B SSH_AUTH_SOCK
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180 Set to a forwarded ssh-agent connection.
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181
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182 .SH NOTES
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183 Dropbear only supports SSH protocol version 2.
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184
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185 .SH AUTHOR
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186 Matt Johnston ([email protected]).
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187 .br
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188 Gerrit Pape ([email protected]) wrote this manual page.
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189 .SH SEE ALSO
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190 dropbearkey(1), dbclient(1), dropbearconvert(1)
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191 .P
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192 https://matt.ucc.asn.au/dropbear/dropbear.html