annotate dropbear.8 @ 510:b85507ade010

- Update manuals, include section on authorized_keys - Change default PATH to /usr/bin:/bin - Mention DEBUG_TRACE in -v help text
author Matt Johnston <matt@ucc.asn.au>
date Wed, 05 Nov 2008 14:14:40 +0000
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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 This file is generated with
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29 .BR dropbearkey (8).
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30 .TP
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31 .B \-r \fIrsakey
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32 rsakeyfile.
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33 Use the contents of the file
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34 .I rsakey
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35 for the rsa host key (default: /etc/dropbear/dropbear_rsa_host_key).
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36 This file is generated with
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37 .BR dropbearkey (8).
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38 .TP
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39 .B \-F
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40 Don't fork into background.
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41 .TP
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42 .B \-E
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43 Log to standard error rather than syslog.
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44 .TP
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45 .B \-m
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46 Don't display the message of the day on login.
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47 .TP
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48 .B \-w
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49 Disallow root logins.
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50 .TP
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51 .B \-s
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52 Disable password logins.
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53 .TP
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54 .B \-g
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55 Disable password logins for root.
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56 .TP
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57 .B \-j
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58 Disable local port forwarding.
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59 .TP
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60 .B \-k
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61 Disable remote port forwarding.
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62 .TP
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63 .B \-p \fI[address:]port
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64 Listen on specified
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65 .I address
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66 and TCP
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67 .I port.
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68 If just a port is given listen
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69 on all addresses.
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70 up to 10 can be specified (default 22 if none specified).
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71 .TP
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72 .B \-i
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73 Service program mode.
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74 Use this option to run
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75 .B dropbear
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76 under TCP/IP servers like inetd, tcpsvd, or tcpserver.
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77 In program mode the \-F option is implied, and \-p options are ignored.
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78 .TP
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79 .B \-P \fIpidfile
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80 Specify a pidfile to create when running as a daemon. If not specified, the
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81 default is /var/run/dropbear.pid
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82 .TP
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83 .B \-a
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84 Allow remote hosts to connect to forwarded ports.
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85 .TP
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86 .B \-W \fIwindowsize
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87 Specify the per-channel receive window buffer size. Increasing this
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88 may improve network performance at the expense of memory use. Use -h to see the
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89 default buffer size.
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90 .TP
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91 .B \-K \fItimeout_seconds
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92 Ensure that traffic is transmitted at a certain interval in seconds. This is
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93 useful for working around firewalls or routers that drop connections after
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94 a certain period of inactivity. The trade-off is that a session may be
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95 closed if there is a temporary lapse of network connectivity. A setting
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96 if 0 disables keepalives.
510
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97 .SH FILES
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98
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99 .TP
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100 Authorized Keys
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101
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102 ~/.ssh/authorized_keys can be set up to allow remote login with a RSA or DSS
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103 key. Each line is of the form
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104 .TP
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105 [restrictions] ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAIgAsp... [comment]
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106
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107 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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108 Restrictions are comma separated, with double quotes around spaces in arguments.
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109 Available restrictions are:
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110
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111 .TP
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112 .B no-port-forwarding
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113 Don't allow port forwarding for this connection
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114
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115 .TP
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116 .B no-agent-forwarding
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117 Don't allow agent forwarding for this connection
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118
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119 .TP
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120 .B no-X11-forwarding
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121 Don't allow X11 forwarding for this connection
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122
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123 .TP
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124 .B no-pty
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125 Disable PTY allocation. Note that a user can still obtain most of the
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126 same functionality with other means even if no-pty is set.
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127
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128 .TP
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129 .B command="\fIforced_command\fR"
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130 Disregard the command provided by the user and always run \fIforced_command\fR.
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131
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132 The authorized_keys file and its containing ~/.ssh directory must only be
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133 writable by the user, otherwise Dropbear will not allow a login using public
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134 key authentication.
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135
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136 .TP
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137 Host Key Files
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138
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139 Host key files are read at startup from a standard location, by default
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140 /etc/dropbear/dropbear_dss_host_key and /etc/dropbear/dropbear_rsa_host_key
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141 or specified on the commandline with -d or -r. These are of the form generated
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142 by dropbearkey.
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143
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144 .TP
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145 Message Of The Day
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146
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147 By default the file /etc/motd will be printed for any login shell (unless
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148 disabled at compile-time). This can also be disabled per-user
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149 by creating a file ~/.hushlogin .
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150
128
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151 .SH AUTHOR
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152 Matt Johnston ([email protected]).
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153 .br
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154 Gerrit Pape ([email protected]en.org) wrote this manual page.
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155 .SH SEE ALSO
181
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156 dropbearkey(8), dbclient(1)
128
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157 .P
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158 http://matt.ucc.asn.au/dropbear/dropbear.html