Mercurial > dropbear
annotate dbclient.1 @ 763:f744321ac048 ecc
ecdh works against OpenSSH
author | Matt Johnston <matt@ucc.asn.au> |
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date | Mon, 08 Apr 2013 23:12:20 +0800 |
parents | aadfa8de977d |
children | 7fc0aeada79c |
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1 .TH dbclient 1 |
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2 .SH NAME |
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3 dbclient \- lightweight SSH2 client |
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4 .SH SYNOPSIS |
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5 .B dbclient |
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6 [\-Tt] [\-p |
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7 .I port\fR] [\-i |
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8 .I id\fR] [\-L |
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9 .I l\fR:\fIh\fR:\fIr\fR] [\-R |
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10 .I l\fR:\fIh\fR:\fIr\fR] [\-l |
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11 .IR user ] |
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12 .I host |
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13 .RI [ command ] |
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14 |
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15 .B dbclient |
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16 [ |
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17 .I args ] |
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18 .I [user1]@host1[/port1],[user2]@host2[/port2],... |
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19 |
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20 .SH DESCRIPTION |
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21 .B dbclient |
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22 is a SSH 2 client designed to be small enough to be used in small memory |
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23 environments, while still being functional and secure enough for general use. |
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24 .SH OPTIONS |
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25 .TP |
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26 .B \-p \fIport |
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27 Remote port. |
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28 Connect to port |
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29 .I port |
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30 on the remote host. |
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31 Default is 22. |
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32 .TP |
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33 .B \-i \fIidfile |
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34 Identity file. |
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35 Read the identity from file |
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36 .I idfile |
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37 (multiple allowed). |
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38 .TP |
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39 .B \-L [\fIlistenaddress\fR]:\fIlistenport\fR:\fIhost\fR:\fIport\fR |
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40 Local port forwarding. |
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41 Forward the port |
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42 .I listenport |
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43 on the local host through the SSH connection to port |
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44 .I port |
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45 on the host |
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46 .IR host . |
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47 .TP |
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48 .B \-R [\fIlistenaddress\fR]:\fIlistenport\fR:\fIhost\fR:\fIport\fR |
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49 Remote port forwarding. |
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50 Forward the port |
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51 .I listenport |
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52 on the remote host through the SSH connection to port |
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53 .I port |
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54 on the host |
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55 .IR host . |
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56 .TP |
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57 .B \-l \fIuser |
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58 Username. |
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59 Login as |
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60 .I user |
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61 on the remote host. |
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62 .TP |
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63 .B \-t |
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64 Allocate a pty. |
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65 .TP |
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66 .B \-T |
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67 Don't allocate a pty. |
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68 .TP |
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69 .B \-N |
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70 Don't request a remote shell or run any commands. Any command arguments are ignored. |
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71 .TP |
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72 .B \-f |
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73 Fork into the background after authentication. A command argument (or -N) is required. |
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74 This is useful when using password authentication. |
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75 .TP |
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76 .B \-g |
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77 Allow non-local hosts to connect to forwarded ports. Applies to -L and -R |
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78 forwarded ports, though remote connections to -R forwarded ports may be limited |
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79 by the ssh server. |
437 | 80 .TP |
81 .B \-y | |
82 Always accept hostkeys if they are unknown. If a hostkey mismatch occurs the | |
83 connection will abort as normal. | |
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84 .TP |
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86 Forward agent connections to the remote host. dbclient will use any | |
87 OpenSSH-style agent program if available ($SSH_AUTH_SOCK will be set) for | |
88 public key authentication. Forwarding is only enabled if -A is specified. | |
89 .TP | |
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90 .B \-W \fIwindowsize |
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91 Specify the per-channel receive window buffer size. Increasing this |
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92 may improve network performance at the expense of memory use. Use -h to see the |
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93 default buffer size. |
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94 .TP |
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95 .B \-K \fItimeout_seconds |
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96 Ensure that traffic is transmitted at a certain interval in seconds. This is |
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97 useful for working around firewalls or routers that drop connections after |
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98 a certain period of inactivity. The trade-off is that a session may be |
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99 closed if there is a temporary lapse of network connectivity. A setting |
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100 if 0 disables keepalives. |
515 | 101 .TP |
102 .B \-I \fIidle_timeout | |
103 Disconnect the session if no traffic is transmitted or received for \fIidle_timeout\fR seconds. | |
104 .TP | |
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105 .B \-J \fIproxy_command |
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106 Use the standard input/output of the program \fIproxy_command\fR rather than using |
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107 a normal TCP connection. A hostname should be still be provided, as this is used for |
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108 comparing saved hostkeys. |
515 | 109 .TP |
516 | 110 .B \-B \fIendhost:endport |
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111 "Netcat-alike" mode, where Dropbear will connect to the given host, then create a |
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112 forwarded connection to \fIendhost\fR. This will then be presented as dbclient's |
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113 standard input/output. |
690 | 114 .TP |
115 .B \-c \fIcipherlist | |
116 Specify a comma separated list of ciphers to enable. Use \fI-c help\fR to list possibilities. | |
117 .TP | |
118 .B \-m \fIMAClist | |
119 Specify a comma separated list of authentication MACs to enable. Use \fI-m help\fR to list possibilities. | |
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120 .TP |
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121 .B \-s |
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122 The specified command will be requested as a subsystem, used for sftp. Dropbear doesn't implement sftp itself but the OpenSSH sftp client can be used eg \fIsftp -S dbclient user@host\fR |
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123 |
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124 .SH MULTI-HOP |
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125 Dropbear will also allow multiple "hops" to be specified, separated by commas. In |
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126 this case a connection will be made to the first host, then a TCP forwarded |
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127 connection will be made through that to the second host, and so on. Hosts other than |
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128 the final destination will not see anything other than the encrypted SSH stream. |
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129 A port for a host can be specified with a slash (eg matt@martello/44 ). |
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130 This syntax can also be used with scp or rsync (specifying dbclient as the |
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131 ssh/rsh command). A file can be "bounced" through multiple SSH hops, eg |
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132 |
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133 scp -S dbclient matt@martello,root@wrt,canyons:/tmp/dump . |
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516 | 135 Note that hostnames are resolved by the prior hop (so "canyons" would be resolved by the host "wrt") |
136 in the example above, the same way as other -L TCP forwarded hosts are. Host keys are | |
137 checked locally based on the given hostname. | |
138 | |
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139 .SH ENVIRONMENT |
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140 .TP |
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141 .B DROPBEAR_PASSWORD |
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142 A password to use for remote authentication can be specified in the environment |
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143 variable DROPBEAR_PASSWORD. Care should be taken that the password is not |
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144 exposed to other users on a multi-user system, or stored in accessible files. |
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145 .TP |
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146 .B SSH_ASKPASS |
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147 dbclient can use an external program to request a password from a user. |
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148 SSH_ASKPASS should be set to the path of a program that will return a password |
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149 on standard output. This program will only be used if either DISPLAY is set and |
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150 standard input is not a TTY, or the environment variable SSH_ASKPASS_ALWAYS is |
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151 set. |
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152 .SH AUTHOR |
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153 Matt Johnston ([email protected]). |
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154 .br |
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155 Mihnea Stoenescu wrote initial Dropbear client support |
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156 .br |
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157 Gerrit Pape ([email protected]) wrote this manual page. |
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158 .SH SEE ALSO |
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159 dropbear(8), dropbearkey(8) |
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160 .P |
690 | 161 https://matt.ucc.asn.au/dropbear/dropbear.html |