defaria.com/blogs/Status/2007/08/ssh.html

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  73                       <li class="asset-meta-list-item">Posted on <time datetime="2007-08-03T17:56:27-08:00" itemprop="datePublished">August  3, 2007</time></li>
  74                       <li class="asset-meta-list-item">by <span class="author entry-author vcard"></span></li>
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  77                       <li class="asset-meta-list-item">in <a itemprop="articleSection" rel="tag" href="http://defaria.com/blogs/Status/general-dynamics/">General Dynamics</a></li>
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  84                   <ul>
  85   <li>Helped Aaron with ssh</li>
  86 </ul>
  87                   <h2>Adding ssh actions to CDE</h2>
  88
  89 <p>Secure SHell or ssh is a more modern and secure way to access a remote system. You can add ssh actions to CDE by doing the following:</p>
  90
  91 <p>Add the following to ~/.dt/types:</p>
  92
  93 <div class=code><pre>
  94 ACTION Ssh
  95 {
  96   LABEL           Secure shell
  97   ICON            Dtterm
  98   ARG_COUNT       0
  99   TYPE            COMMAND
 100   WINDOW_TYPE     NO_STDIO
 101   EXEC_STRING     ksh -c 'export _title="%"Starbase?"%";          \
 102     /usr/dt/bin/dtterm -name $_title                              \
 103     -title "Opening hailing frequencies to starbase $_title..."   \
 104     -e ksh -c "ssh $_title; sleep 5;";'
 105   DESCRIPTION     The Secure shell action prompts the user for    \
 106                   the name of a system, opens a dtterm terminal   \
 107                   emulator window, and then performs an ssh to    \
 108                   that system.
 109 }
 110
 111 ACTION SshUser
 112 {
 113   LABEL           Secure shell
 114   ICON            Dtterm
 115   ARG_COUNT       0
 116   TYPE            COMMAND
 117   WINDOW_TYPE     NO_STDIO
 118   EXEC_STRING     ksh -c 'export _title="%"Starbase?"%";          \
 119     export _user="%"Username"%";                                  \
 120     /usr/dt/bin/dtterm -name $_title                              \
 121     -title                                                        \
 122       "Opening hailing frequencies to starbase $_user@$_title..." \
 123     -e ksh -c "ssh $_user@$_title; sleep 5;";'
 124   DESCRIPTION     The Secure shell action prompts the user for    \
 125                   the name of a system and a username and opens   \
 126                   a dtterm terminal emulator window, and then     \
 127                   performs an ssh to that system.
 128 }
 129 </pre></div>
 130
 131 <p>Then invoke the actions with:</li>
 132
 133 <div class=code><pre>
 134 $ dtaction Ssh
 135 $ dtaction SshUser
 136 </pre></div>
 137
 138 <p>or better yet put it into your Dtwm menus like:</p>
 139
 140 <div class=code><pre>
 141     Menu Terminals
 142     {
 143       "Terminals"           f.title
 144       "Terminal"            f.action Dtterm
 145       "Remote Terminal"     f.action Ssh
 146       "Remote Terminal (user)"      f.action SshUser
 147       "X Terminal"          f.action Xterm
 148     }
 149 </pre></div>
 150
 151 <h2>Configuring ssh for passwordless but secure public key authentication</h2>
 152
 153 <p>In order to do public key authentication you need to first generate a public key. You do this for ssh with ssh-keygen:</p>
 154
 155 <div class=code><pre>
 156 $ ssh-keygen -t rsa
 157 </pre></div>
 158
 159 <p>Note you can also do -t dsa. There are RSA keys and DSA keys. I forget what the prompts are, something about a passphrase, etc. Enter no passphrase.</p>
 160
 161 <p>This should create a directory ~/.ssh with files in it. For example:</p>
 162
 163 <div class=code><pre>
 164 <b><font color="#3333ff">$</font></b> <u>ssh-keygen -t rsa</u>
 165 Enter file in which to save the key(/home/p6258c/.ssh/id_rsa):
 166 Generating public/private rsa key pair.
 167 Enter passphrase(empty for no passphrase):
 168 <b><font color="#3333ff">$</font></b> <u>ls -l ~/.ssh</u>
 169 total 32
 170 -rw-------    1 p6258c   ccusers       226 Jun 15 13:28 authorized_keys
 171 -rw-------    1 p6258c   ccusers       887 Jun 15 13:27 id_rsa
 172 -rw-rw-r--    1 p6258c   ccusers       226 Jun 15 13:27 id_rsa.pub
 173 -rw-r--r--    1 p6258c   ccusers      4082 Jul 31 15:05 known_hosts
 174 <b><font color="#3333ff">$</font></b> <u>ls -ld .</u>
 175 drwxr-xr-x   43 p6258c   ccusers      2048 Aug  3 10:28 ./
 176 <b><font color="#3333ff">$</font></b>
 177 </pre></div>
 178
 179 <p>Then the task is to get the ~/.ssh/id_rsa.pub key added to the authorized_keys file (creating it if you need to). Here in GD that is easy. Siimply:</p>
 180
 181 <div class=code><pre>
 182 <b><font color="#3333ff">$</font></b> <u>cat ~/.ssh/id_rsa.pub &gt;&gt; ~/.ssh/authorized_keys</u>
 183 </pre></div>
 184
 185 <p>Now, since all GD machines in the RAN subnet share your same home directory (automounted from the same common location) viola! You now have passwordless ssh access using public key authentication through the RAN (note this does not cross from RAN -&gt; GD network due to firewall issues). Whenever you ssh to a new machine it will bother you about adding it to the known_hosts file but after that it should not prompt again.</p>
 186
 187 <p>Also note that if this were a different situation you'd have to get the contents of ~/.ssh/id_rsa.pub over to the remote machine. For example, I could generate my keys as described above then email the ~/.ssh/id_rsa.pub from here to my home Linux system, append it to my ~/.ssh/authorized_keys on my home Linux system then I could ssh from here to home. Normally I configure my house to <b>only</b> allow public key authenticated logins from the outside world. I can't do it here from GD because the firewall prohibits it (which is odd)!</p>
 188
 189 <p>Final note: Sometimes, if ssh is configured to by strict about permissions, you need to change your home directory to be 755 as shown above. Normally I'm a sharing kinda guy so I have my home directory set to 775 but with ssh strict permissions that'll cause passwordless ssh to not work anymore.</p>
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