Mercurial > dropbear
annotate dropbear.8 @ 1887:30fd047f6ebf
Fix pytest incorrect skip "reason" string
No change to functionality
author | Matt Johnston <matt@ucc.asn.au> |
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date | Wed, 16 Mar 2022 17:32:43 +0800 |
parents | e9854650d45b |
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1 .TH dropbear 8 |
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2 .SH NAME |
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3 dropbear \- lightweight SSH server |
128
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4 .SH SYNOPSIS |
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5 .B dropbear |
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6 [\fIflag arguments\fR] [\-b |
860 | 7 .I banner\fR] |
8 [\-r | |
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9 .I hostkeyfile\fR] [\-p [\fIaddress\fR:]\fIport\fR] |
128
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10 .SH DESCRIPTION |
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11 .B dropbear |
946 | 12 is a small SSH server |
128
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13 .SH OPTIONS |
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14 .TP |
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15 .B \-b \fIbanner |
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16 bannerfile. |
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17 Display the contents of the file |
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18 .I banner |
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19 before user login (default: none). |
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20 .TP |
860 | 21 .B \-r \fIhostkey |
128
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22 Use the contents of the file |
860 | 23 .I hostkey |
24 for the SSH hostkey. | |
128
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25 This file is generated with |
860 | 26 .BR dropbearkey (1) |
27 or automatically with the '-R' option. See "Host Key Files" below. | |
128
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28 .TP |
860 | 29 .B \-R |
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30 Generate hostkeys automatically. See "Host Key Files" below. |
128
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31 .TP |
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32 .B \-F |
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33 Don't fork into background. |
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34 .TP |
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35 .B \-E |
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36 Log to standard error rather than syslog. |
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37 .TP |
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38 .B \-e |
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39 Pass on the server environment to all child processes. This is required, for example, |
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40 if Dropbear is launched on the fly from a SLURM workload manager. The environment is not |
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41 passed by default. Note that this could expose secrets in environment variables from |
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42 the calling process - use with caution. |
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43 .TP |
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44 .B \-m |
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45 Don't display the message of the day on login. |
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46 .TP |
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47 .B \-w |
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48 Disallow root logins. |
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49 .TP |
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50 .B \-s |
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51 Disable password logins. |
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52 .TP |
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53 .B \-g |
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54 Disable password logins for root. |
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55 .TP |
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56 .B \-j |
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57 Disable local port forwarding. |
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58 .TP |
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59 .B \-k |
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60 Disable remote port forwarding. |
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61 .TP |
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62 .B \-p\fR [\fIaddress\fR:]\fIport |
438 | 63 Listen on specified |
64 .I address | |
65 and TCP | |
66 .I port. | |
67 If just a port is given listen | |
68 on all addresses. | |
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69 Up to 10 can be specified (default 22 if none specified). |
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70 .TP |
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71 .B \-i |
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72 Service program mode. |
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73 Use this option to run |
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74 .B dropbear |
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75 under TCP/IP servers like inetd, tcpsvd, or tcpserver. |
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76 In program mode the \-F option is implied, and \-p options are ignored. |
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77 .TP |
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78 .B \-P \fIpidfile |
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79 Specify a pidfile to create when running as a daemon. If not specified, the |
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80 default is /var/run/dropbear.pid |
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81 .TP |
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82 .B \-a |
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83 Allow remote hosts to connect to forwarded ports. |
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84 .TP |
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85 .B \-W \fIwindowsize |
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86 Specify the per-channel receive window buffer size. Increasing this |
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87 may improve network performance at the expense of memory use. Use -h to see the |
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88 default buffer size. |
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89 .TP |
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90 .B \-K \fItimeout_seconds |
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91 Ensure that traffic is transmitted at a certain interval in seconds. This is |
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92 useful for working around firewalls or routers that drop connections after |
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93 a certain period of inactivity. The trade-off is that a session may be |
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94 closed if there is a temporary lapse of network connectivity. A setting |
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95 of 0 disables keepalives. If no response is received for 3 consecutive keepalives the connection will be closed. |
515 | 96 .TP |
97 .B \-I \fIidle_timeout | |
98 Disconnect the session if no traffic is transmitted or received for \fIidle_timeout\fR seconds. | |
946 | 99 .TP |
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100 .B \-T \fImax_authentication_attempts |
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101 Set the number of authentication attempts allowed per connection. If unspecified the default is 10 (MAX_AUTH_TRIES) |
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102 .TP |
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103 .B \-c \fIforced_command |
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104 Disregard the command provided by the user and always run \fIforced_command\fR. This also |
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105 overrides any authorized_keys command= option. The original command is saved in the |
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106 SSH_ORIGINAL_COMMAND environment variable (see below). |
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107 .TP |
946 | 108 .B \-V |
109 Print the version | |
110 | |
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111 .SH FILES |
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112 |
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113 .TP |
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114 Authorized Keys |
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115 |
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116 ~/.ssh/authorized_keys can be set up to allow remote login with a RSA, |
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117 ECDSA, Ed25519 or DSS |
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118 key. Each line is of the form |
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119 .TP |
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120 [restrictions] ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAIgAsp... [comment] |
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121 |
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122 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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123 Restrictions are comma separated, with double quotes around spaces in arguments. |
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124 Available restrictions are: |
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125 |
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126 .TP |
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127 .B no-port-forwarding |
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128 Don't allow port forwarding for this connection |
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129 |
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130 .TP |
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131 .B no-agent-forwarding |
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132 Don't allow agent forwarding for this connection |
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133 |
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134 .TP |
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135 .B no-X11-forwarding |
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136 Don't allow X11 forwarding for this connection |
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137 |
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138 .TP |
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139 .B no-pty |
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140 Disable PTY allocation. Note that a user can still obtain most of the |
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141 same functionality with other means even if no-pty is set. |
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142 |
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143 .TP |
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144 .B restrict |
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145 Applies all the no- restrictions listed above. |
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146 |
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147 .TP |
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148 .B command=\fR"\fIforced_command\fR" |
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149 Disregard the command provided by the user and always run \fIforced_command\fR. |
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150 The -c command line option overrides this. |
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151 |
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152 The authorized_keys file and its containing ~/.ssh directory must only be |
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153 writable by the user, otherwise Dropbear will not allow a login using public |
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154 key authentication. |
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155 |
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156 .TP |
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157 Host Key Files |
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158 |
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159 Host key files are read at startup from a standard location, by default |
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160 /etc/dropbear/dropbear_dss_host_key, /etc/dropbear/dropbear_rsa_host_key, |
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161 /etc/dropbear/dropbear_ecdsa_host_key and /etc/dropbear/dropbear_ed25519_host_key |
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162 |
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163 If the -r command line option is specified the default files are not loaded. |
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164 Host key files are of the form generated by dropbearkey. |
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165 The -R option can be used to automatically generate keys |
860 | 166 in the default location - keys will be generated after startup when the first |
167 connection is established. This had the benefit that the system /dev/urandom | |
168 random number source has a better chance of being securely seeded. | |
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169 |
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170 .TP |
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171 Message Of The Day |
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172 |
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173 By default the file /etc/motd will be printed for any login shell (unless |
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174 disabled at compile-time). This can also be disabled per-user |
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175 by creating a file ~/.hushlogin . |
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176 |
569 | 177 .SH ENVIRONMENT VARIABLES |
178 Dropbear sets the standard variables USER, LOGNAME, HOME, SHELL, PATH, and TERM. | |
179 | |
180 The variables below are set for sessions as appropriate. | |
181 | |
182 .TP | |
183 .B SSH_TTY | |
184 This is set to the allocated TTY if a PTY was used. | |
185 | |
186 .TP | |
187 .B SSH_CONNECTION | |
188 Contains "<remote_ip> <remote_port> <local_ip> <local_port>". | |
189 | |
190 .TP | |
191 .B DISPLAY | |
192 Set X11 forwarding is used. | |
193 | |
194 .TP | |
195 .B SSH_ORIGINAL_COMMAND | |
196 If a 'command=' authorized_keys option was used, the original command is specified | |
197 in this variable. If a shell was requested this is set to an empty value. | |
198 | |
199 .TP | |
200 .B SSH_AUTH_SOCK | |
201 Set to a forwarded ssh-agent connection. | |
202 | |
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203 .SH NOTES |
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204 Dropbear only supports SSH protocol version 2. |
569 | 205 |
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206 .SH AUTHOR |
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207 Matt Johnston ([email protected]). |
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208 .br |
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209 Gerrit Pape ([email protected]) wrote this manual page. |
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210 .SH SEE ALSO |
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211 dropbearkey(1), dbclient(1), dropbearconvert(1) |
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212 .P |
690 | 213 https://matt.ucc.asn.au/dropbear/dropbear.html |