annotate dropbear.8 @ 560:52d7301e46bd agent-client

Agent forwarding works
author Matt Johnston <matt@ucc.asn.au>
date Thu, 30 Jul 2009 15:14:33 +0000
parents fe30d2a2d626
children 6f472dc54da7
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1 .TH dropbear 8
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2 .SH NAME
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3 dropbear \- lightweight SSH2 server
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4 .SH SYNOPSIS
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5 .B dropbear
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6 [\-FEmwsgjki] [\-b
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7 .I banner\fR] [\-d
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8 .I dsskey\fR] [\-r
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9 .I rsakey\fR] [\-p
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10 .IR port ]
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11 .SH DESCRIPTION
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12 .B dropbear
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13 is a SSH 2 server designed to be small enough to be used in small memory
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14 environments, while still being functional and secure enough for general use.
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15 .SH OPTIONS
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16 .TP
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17 .B \-b \fIbanner
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18 bannerfile.
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19 Display the contents of the file
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20 .I banner
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21 before user login (default: none).
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22 .TP
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23 .B \-d \fIdsskey
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24 dsskeyfile.
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25 Use the contents of the file
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26 .I dsskey
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27 for the DSS host key (default: /etc/dropbear/dropbear_dss_host_key).
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28 Note that
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29 some SSH implementations
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30 use the term "DSA" rather than "DSS", they mean the same thing.
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31 This file is generated with
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32 .BR dropbearkey (8).
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33 .TP
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34 .B \-r \fIrsakey
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35 rsakeyfile.
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36 Use the contents of the file
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37 .I rsakey
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38 for the rsa host key (default: /etc/dropbear/dropbear_rsa_host_key).
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39 This file is generated with
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40 .BR dropbearkey (8).
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41 .TP
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42 .B \-F
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43 Don't fork into background.
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44 .TP
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45 .B \-E
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46 Log to standard error rather than syslog.
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47 .TP
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48 .B \-m
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49 Don't display the message of the day on login.
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50 .TP
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51 .B \-w
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52 Disallow root logins.
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53 .TP
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54 .B \-s
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55 Disable password logins.
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56 .TP
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57 .B \-g
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58 Disable password logins for root.
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59 .TP
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60 .B \-j
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61 Disable local port forwarding.
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62 .TP
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63 .B \-k
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64 Disable remote port forwarding.
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65 .TP
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66 .B \-p \fI[address:]port
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67 Listen on specified
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68 .I address
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69 and TCP
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70 .I port.
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71 If just a port is given listen
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72 on all addresses.
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73 up to 10 can be specified (default 22 if none specified).
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74 .TP
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75 .B \-i
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76 Service program mode.
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77 Use this option to run
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78 .B dropbear
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79 under TCP/IP servers like inetd, tcpsvd, or tcpserver.
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80 In program mode the \-F option is implied, and \-p options are ignored.
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81 .TP
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82 .B \-P \fIpidfile
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83 Specify a pidfile to create when running as a daemon. If not specified, the
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84 default is /var/run/dropbear.pid
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85 .TP
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86 .B \-a
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87 Allow remote hosts to connect to forwarded ports.
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88 .TP
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89 .B \-W \fIwindowsize
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90 Specify the per-channel receive window buffer size. Increasing this
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91 may improve network performance at the expense of memory use. Use -h to see the
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92 default buffer size.
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93 .TP
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94 .B \-K \fItimeout_seconds
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95 Ensure that traffic is transmitted at a certain interval in seconds. This is
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96 useful for working around firewalls or routers that drop connections after
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97 a certain period of inactivity. The trade-off is that a session may be
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98 closed if there is a temporary lapse of network connectivity. A setting
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99 if 0 disables keepalives.
515
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100 .TP
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101 .B \-I \fIidle_timeout
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102 Disconnect the session if no traffic is transmitted or received for \fIidle_timeout\fR seconds.
510
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103 .SH FILES
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104
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105 .TP
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106 Authorized Keys
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107
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108 ~/.ssh/authorized_keys can be set up to allow remote login with a RSA or DSS
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109 key. Each line is of the form
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110 .TP
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111 [restrictions] ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAIgAsp... [comment]
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112
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113 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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114 Restrictions are comma separated, with double quotes around spaces in arguments.
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115 Available restrictions are:
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116
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117 .TP
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118 .B no-port-forwarding
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119 Don't allow port forwarding for this connection
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120
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121 .TP
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122 .B no-agent-forwarding
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123 Don't allow agent forwarding for this connection
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124
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125 .TP
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126 .B no-X11-forwarding
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127 Don't allow X11 forwarding for this connection
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128
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129 .TP
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130 .B no-pty
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131 Disable PTY allocation. Note that a user can still obtain most of the
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132 same functionality with other means even if no-pty is set.
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133
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134 .TP
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135 .B command="\fIforced_command\fR"
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136 Disregard the command provided by the user and always run \fIforced_command\fR.
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137
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138 The authorized_keys file and its containing ~/.ssh directory must only be
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139 writable by the user, otherwise Dropbear will not allow a login using public
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140 key authentication.
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141
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142 .TP
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143 Host Key Files
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144
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145 Host key files are read at startup from a standard location, by default
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146 /etc/dropbear/dropbear_dss_host_key and /etc/dropbear/dropbear_rsa_host_key
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147 or specified on the commandline with -d or -r. These are of the form generated
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148 by dropbearkey.
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149
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150 .TP
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151 Message Of The Day
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152
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153 By default the file /etc/motd will be printed for any login shell (unless
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154 disabled at compile-time). This can also be disabled per-user
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155 by creating a file ~/.hushlogin .
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156
128
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157 .SH AUTHOR
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158 Matt Johnston ([email protected]).
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159 .br
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160 Gerrit Pape ([email protected]) wrote this manual page.
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161 .SH SEE ALSO
181
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162 dropbearkey(8), dbclient(1)
128
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163 .P
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164 http://matt.ucc.asn.au/dropbear/dropbear.html