Mercurial > dropbear
annotate dropbear.8 @ 556:ccdc4c6183c0
- Payload length doesn't include macsize.
author | Matt Johnston <matt@ucc.asn.au> |
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date | Sun, 26 Jul 2009 16:11:27 +0000 |
parents | fe30d2a2d626 |
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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. |
128
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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 |
438 | 66 .B \-p \fI[address:]port |
67 Listen on specified | |
68 .I address | |
69 and TCP | |
70 .I port. | |
71 If just a port is given listen | |
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 | 100 .TP |
101 .B \-I \fIidle_timeout | |
102 Disconnect the session if no traffic is transmitted or received for \fIidle_timeout\fR seconds. | |
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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) |
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163 .P |
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164 http://matt.ucc.asn.au/dropbear/dropbear.html |