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<td class="file-title"><span class="file-title-prefix">Class</span><br />Net::SSH::Transport::AlgorithmNegotiator</td>
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<td>In:</td>
<td>
<a href="../../../../files/lib/net/ssh/transport/algorithm-negotiator_rb.html">lib/net/ssh/transport/algorithm-negotiator.rb</a>
</td>
</tr>
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<td>Parent:</td>
<td>
Object
</td>
</tr>
</table>
</td>
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<!-- banner header -->
<div id="bodyContent">
<div id="content">
<div class="description"><p>
The <a href="AlgorithmNegotiator.html">AlgorithmNegotiator</a> is used for
negotiating the algorithms to be employed for a specific <a
href="../../SSH.html">SSH</a> session.
</p>
</div>
<div class="sectiontitle">Methods</div>
<ul>
<li><a href="#M000071">negotiate</a></li>
<li><a href="#M000070">new</a></li>
</ul>
<div class="sectiontitle">Included Modules</div>
<ul>
<li><a href="Constants.html">Constants</a></li>
</ul>
<div class="sectiontitle">Constants</div>
<table border='0' cellpadding='5'>
<tr valign='top'>
<td class="attr-name">Algorithms</td>
<td>=</td>
<td class="attr-value">Struct.new( :server_packet, :client_packet, :kex, :host_key, :encryption_c2s, :encryption_s2c, :mac_c2s, :mac_s2c, :compression_c2s, :compression_s2c, :language_c2s, :language_s2c, :compression_level )</td>
</tr>
</table>
<div class="sectiontitle">Public Class methods</div>
<div class="method">
<div class="title">
<a name="M000070"></a><b>new</b>( logger, algorithms, buffers )
</div>
<div class="description">
<p>
Create a <a href="AlgorithmNegotiator.html#M000070">new</a> <a
href="AlgorithmNegotiator.html">AlgorithmNegotiator</a> instance, using the
given logger, set of default algorithms, and buffer factory.
</p>
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<div class="sourcecode">
<p class="source-link">[ <a href="javascript:toggleSource('M000070_source')" id="l_M000070_source">show source</a> ]</p>
<div id="M000070_source" class="dyn-source">
<pre>
<span class="ruby-comment cmt"># File lib/net/ssh/transport/algorithm-negotiator.rb, line 46</span>
46: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">initialize</span>( <span class="ruby-identifier">logger</span>, <span class="ruby-identifier">algorithms</span>, <span class="ruby-identifier">buffers</span> )
47: <span class="ruby-ivar">@default_algorithms</span> = <span class="ruby-identifier">algorithms</span>
48: <span class="ruby-ivar">@buffers</span> = <span class="ruby-identifier">buffers</span>
49: <span class="ruby-ivar">@logger</span> = <span class="ruby-identifier">logger</span>
50: <span class="ruby-keyword kw">end</span>
</pre>
</div>
</div>
</div>
<div class="sectiontitle">Public Instance methods</div>
<div class="method">
<div class="title">
<a name="M000071"></a><b>negotiate</b>( session, options )
</div>
<div class="description">
<p>
Negotiate the supported algorithms with the server. If a compromise cannot
be reached between what the client wants and what the server can provide,
this will fail.
</p>
</div>
<div class="sourcecode">
<p class="source-link">[ <a href="javascript:toggleSource('M000071_source')" id="l_M000071_source">show source</a> ]</p>
<div id="M000071_source" class="dyn-source">
<pre>
<span class="ruby-comment cmt"># File lib/net/ssh/transport/algorithm-negotiator.rb, line 109</span>
109: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">negotiate</span>( <span class="ruby-identifier">session</span>, <span class="ruby-identifier">options</span> )
110: <span class="ruby-identifier">prepare_preferred_algorithms</span> <span class="ruby-identifier">session</span>, <span class="ruby-identifier">options</span>
111:
112: <span class="ruby-comment cmt"># first, discover what the server can do</span>
113: <span class="ruby-identifier">type</span>, <span class="ruby-identifier">buffer</span> = <span class="ruby-identifier">session</span>.<span class="ruby-identifier">wait_for_message</span>
114: <span class="ruby-identifier">raise</span> <span class="ruby-constant">Net</span><span class="ruby-operator">::</span><span class="ruby-constant">SSH</span><span class="ruby-operator">::</span><span class="ruby-constant">Exception</span>, <span class="ruby-value str">"expected KEXINIT"</span> <span class="ruby-keyword kw">unless</span> <span class="ruby-identifier">type</span> <span class="ruby-operator">==</span> <span class="ruby-constant">KEXINIT</span>
115:
116: <span class="ruby-identifier">server_algorithm_packet</span> = <span class="ruby-identifier">buffer</span>.<span class="ruby-identifier">content</span>
117:
118: <span class="ruby-identifier">cookie</span> = <span class="ruby-identifier">buffer</span>.<span class="ruby-identifier">read</span>( <span class="ruby-value">16</span> )
119: <span class="ruby-identifier">kex_algorithms</span> = <span class="ruby-identifier">buffer</span>.<span class="ruby-identifier">read_string</span>
120: <span class="ruby-identifier">server_host_key_algorithms</span> = <span class="ruby-identifier">buffer</span>.<span class="ruby-identifier">read_string</span>
121: <span class="ruby-identifier">encryption_algorithms_client_to_server</span> = <span class="ruby-identifier">buffer</span>.<span class="ruby-identifier">read_string</span>
122: <span class="ruby-identifier">encryption_algorithms_server_to_client</span> = <span class="ruby-identifier">buffer</span>.<span class="ruby-identifier">read_string</span>
123: <span class="ruby-identifier">mac_algorithms_client_to_server</span> = <span class="ruby-identifier">buffer</span>.<span class="ruby-identifier">read_string</span>
124: <span class="ruby-identifier">mac_algorithms_server_to_client</span> = <span class="ruby-identifier">buffer</span>.<span class="ruby-identifier">read_string</span>
125: <span class="ruby-identifier">compression_algorithms_client_to_server</span> = <span class="ruby-identifier">buffer</span>.<span class="ruby-identifier">read_string</span>
126: <span class="ruby-identifier">compression_algorithms_server_to_client</span> = <span class="ruby-identifier">buffer</span>.<span class="ruby-identifier">read_string</span>
127: <span class="ruby-identifier">languages_client_to_server</span> = <span class="ruby-identifier">buffer</span>.<span class="ruby-identifier">read_string</span>
128: <span class="ruby-identifier">languages_server_to_client</span> = <span class="ruby-identifier">buffer</span>.<span class="ruby-identifier">read_string</span>
129: <span class="ruby-identifier">first_kex_packet_follows</span> = <span class="ruby-identifier">buffer</span>.<span class="ruby-identifier">read_bool</span>
130: <span class="ruby-identifier">zero</span> = <span class="ruby-identifier">buffer</span>.<span class="ruby-identifier">read_long</span>
131:
132: <span class="ruby-comment cmt"># TODO: if first_kex_packet_follows, we need to try to skip the</span>
133: <span class="ruby-comment cmt"># actual kexinit stuff and try to guess what the server is doing...</span>
134: <span class="ruby-comment cmt"># need to read more about this scenario.</span>
135:
136: <span class="ruby-comment cmt"># next, tell the server what we can do</span>
137:
138: <span class="ruby-identifier">my_kex</span> = <span class="ruby-ivar">@algorithms</span>[ <span class="ruby-identifier">:kex</span> ].<span class="ruby-identifier">join</span>( <span class="ruby-value str">","</span> )
139: <span class="ruby-identifier">my_server_host_key_algorithms</span> = <span class="ruby-ivar">@algorithms</span>[ <span class="ruby-identifier">:host_key</span> ].<span class="ruby-identifier">join</span>( <span class="ruby-value str">","</span> )
140: <span class="ruby-identifier">my_encryption_algorithms</span> = <span class="ruby-ivar">@algorithms</span>[ <span class="ruby-identifier">:encryption</span> ].<span class="ruby-identifier">join</span>( <span class="ruby-value str">","</span> )
141: <span class="ruby-identifier">my_mac_algorithms</span> = <span class="ruby-ivar">@algorithms</span>[ <span class="ruby-identifier">:hmac</span> ].<span class="ruby-identifier">join</span>( <span class="ruby-value str">","</span> )
142: <span class="ruby-identifier">my_compression_algorithms</span> = <span class="ruby-ivar">@algorithms</span>[ <span class="ruby-identifier">:compression</span> ].<span class="ruby-identifier">join</span>( <span class="ruby-value str">","</span> )
143: <span class="ruby-identifier">my_languages</span> = <span class="ruby-ivar">@algorithms</span>[ <span class="ruby-identifier">:languages</span> ].<span class="ruby-identifier">join</span>( <span class="ruby-value str">","</span> )
144:
145: <span class="ruby-identifier">msg</span> = <span class="ruby-ivar">@buffers</span>.<span class="ruby-identifier">writer</span>
146: <span class="ruby-identifier">msg</span>.<span class="ruby-identifier">write_byte</span> <span class="ruby-constant">KEXINIT</span>
147: <span class="ruby-identifier">msg</span>.<span class="ruby-identifier">write_long</span> <span class="ruby-identifier">rand</span>(<span class="ruby-value">0x</span><span class="ruby-constant">FFFFFFFF</span>), <span class="ruby-identifier">rand</span>(<span class="ruby-value">0x</span><span class="ruby-constant">FFFFFFFF</span>), <span class="ruby-identifier">rand</span>(<span class="ruby-value">0x</span><span class="ruby-constant">FFFFFFFF</span>),
148: <span class="ruby-identifier">rand</span>(<span class="ruby-value">0x</span><span class="ruby-constant">FFFFFFFF</span>)
149: <span class="ruby-identifier">msg</span>.<span class="ruby-identifier">write_string</span> <span class="ruby-identifier">my_kex</span>, <span class="ruby-identifier">my_server_host_key_algorithms</span>
150: <span class="ruby-identifier">msg</span>.<span class="ruby-identifier">write_string</span> <span class="ruby-identifier">my_encryption_algorithms</span>, <span class="ruby-identifier">my_encryption_algorithms</span>
151: <span class="ruby-identifier">msg</span>.<span class="ruby-identifier">write_string</span> <span class="ruby-identifier">my_mac_algorithms</span>, <span class="ruby-identifier">my_mac_algorithms</span>
152: <span class="ruby-identifier">msg</span>.<span class="ruby-identifier">write_string</span> <span class="ruby-identifier">my_compression_algorithms</span>, <span class="ruby-identifier">my_compression_algorithms</span>
153: <span class="ruby-identifier">msg</span>.<span class="ruby-identifier">write_string</span> <span class="ruby-identifier">my_languages</span>, <span class="ruby-identifier">my_languages</span>
154: <span class="ruby-identifier">msg</span>.<span class="ruby-identifier">write_bool</span> <span class="ruby-keyword kw">false</span>
155: <span class="ruby-identifier">msg</span>.<span class="ruby-identifier">write_long</span> <span class="ruby-value">0</span>
156:
157: <span class="ruby-identifier">client_algorithm_packet</span> = <span class="ruby-identifier">msg</span>.<span class="ruby-identifier">to_s</span>
158: <span class="ruby-identifier">session</span>.<span class="ruby-identifier">send_message</span> <span class="ruby-identifier">msg</span>
159:
160: <span class="ruby-comment cmt"># negotiate algorithms</span>
161:
162: <span class="ruby-identifier">kex_algorithm</span> = <span class="ruby-identifier">first_matching_element</span>( <span class="ruby-ivar">@algorithms</span>[ <span class="ruby-identifier">:kex</span> ],
163: <span class="ruby-identifier">kex_algorithms</span> )
164: <span class="ruby-identifier">raise</span> <span class="ruby-constant">Net</span><span class="ruby-operator">::</span><span class="ruby-constant">SSH</span><span class="ruby-operator">::</span><span class="ruby-constant">Exception</span>,
165: <span class="ruby-value str">"could not settle on kex algorithm"</span> <span class="ruby-keyword kw">unless</span> <span class="ruby-identifier">kex_algorithm</span>
166: <span class="ruby-ivar">@logger</span>.<span class="ruby-identifier">debug</span> <span class="ruby-node">"kex algorithm: #{kex_algorithm}"</span> <span class="ruby-keyword kw">if</span> <span class="ruby-ivar">@logger</span>.<span class="ruby-identifier">debug?</span>
167:
168: <span class="ruby-identifier">host_key_algorithm</span> = <span class="ruby-identifier">first_matching_element</span>(
169: <span class="ruby-ivar">@algorithms</span>[ <span class="ruby-identifier">:host_key</span> ], <span class="ruby-identifier">server_host_key_algorithms</span> )
170: <span class="ruby-identifier">raise</span> <span class="ruby-constant">Net</span><span class="ruby-operator">::</span><span class="ruby-constant">SSH</span><span class="ruby-operator">::</span><span class="ruby-constant">Exception</span>,
171: <span class="ruby-value str">"could not settle on host key algorithm"</span> <span class="ruby-keyword kw">unless</span> <span class="ruby-identifier">host_key_algorithm</span>
172: <span class="ruby-keyword kw">if</span> <span class="ruby-ivar">@logger</span>.<span class="ruby-identifier">debug?</span>
173: <span class="ruby-ivar">@logger</span>.<span class="ruby-identifier">debug</span> <span class="ruby-node">"host key algorithm: #{host_key_algorithm}"</span>
174: <span class="ruby-keyword kw">end</span>
175:
176: <span class="ruby-identifier">encryption_algorithm_c2s</span> = <span class="ruby-identifier">first_matching_element</span>(
177: <span class="ruby-ivar">@algorithms</span>[ <span class="ruby-identifier">:encryption</span> ], <span class="ruby-identifier">encryption_algorithms_client_to_server</span> )
178: <span class="ruby-keyword kw">unless</span> <span class="ruby-identifier">encryption_algorithm_c2s</span>
179: <span class="ruby-identifier">raise</span> <span class="ruby-constant">Net</span><span class="ruby-operator">::</span><span class="ruby-constant">SSH</span><span class="ruby-operator">::</span><span class="ruby-constant">Exception</span>,
180: <span class="ruby-value str">"could not settle on client-to-server encryption algorithm"</span>
181: <span class="ruby-keyword kw">end</span>
182: <span class="ruby-keyword kw">if</span> <span class="ruby-ivar">@logger</span>.<span class="ruby-identifier">debug?</span>
183: <span class="ruby-ivar">@logger</span>.<span class="ruby-identifier">debug</span> <span class="ruby-value str">"encryption algorithm (client-to-server): "</span> <span class="ruby-operator">+</span>
184: <span class="ruby-identifier">encryption_algorithm_c2s</span>
185: <span class="ruby-keyword kw">end</span>
186:
187: <span class="ruby-identifier">encryption_algorithm_s2c</span> = <span class="ruby-identifier">first_matching_element</span>(
188: <span class="ruby-ivar">@algorithms</span>[ <span class="ruby-identifier">:encryption</span> ], <span class="ruby-identifier">encryption_algorithms_server_to_client</span> )
189: <span class="ruby-keyword kw">unless</span> <span class="ruby-identifier">encryption_algorithm_s2c</span>
190: <span class="ruby-identifier">raise</span> <span class="ruby-constant">Net</span><span class="ruby-operator">::</span><span class="ruby-constant">SSH</span><span class="ruby-operator">::</span><span class="ruby-constant">Exception</span>,
191: <span class="ruby-value str">"could not settle on server-to-client encryption algorithm"</span>
192: <span class="ruby-keyword kw">end</span>
193: <span class="ruby-keyword kw">if</span> <span class="ruby-ivar">@logger</span>.<span class="ruby-identifier">debug?</span>
194: <span class="ruby-ivar">@logger</span>.<span class="ruby-identifier">debug</span> <span class="ruby-value str">"encryption algorithm (server-to-client): "</span> <span class="ruby-operator">+</span>
195: <span class="ruby-identifier">encryption_algorithm_s2c</span>
196: <span class="ruby-keyword kw">end</span>
197:
198: <span class="ruby-identifier">mac_algorithm_c2s</span> = <span class="ruby-identifier">first_matching_element</span>(
199: <span class="ruby-ivar">@algorithms</span>[ <span class="ruby-identifier">:hmac</span> ], <span class="ruby-identifier">mac_algorithms_client_to_server</span> )
200: <span class="ruby-keyword kw">unless</span> <span class="ruby-identifier">mac_algorithm_c2s</span>
201: <span class="ruby-identifier">raise</span> <span class="ruby-constant">Net</span><span class="ruby-operator">::</span><span class="ruby-constant">SSH</span><span class="ruby-operator">::</span><span class="ruby-constant">Exception</span>,
202: <span class="ruby-value str">"could not settle on client-to-server HMAC algorithm"</span>
203: <span class="ruby-keyword kw">end</span>
204: <span class="ruby-keyword kw">if</span> <span class="ruby-ivar">@logger</span>.<span class="ruby-identifier">debug?</span>
205: <span class="ruby-ivar">@logger</span>.<span class="ruby-identifier">debug</span> <span class="ruby-value str">"hmac algorithm (client-to-server): "</span> <span class="ruby-operator">+</span>
206: <span class="ruby-identifier">mac_algorithm_c2s</span>
207: <span class="ruby-keyword kw">end</span>
208:
209: <span class="ruby-identifier">mac_algorithm_s2c</span> = <span class="ruby-identifier">first_matching_element</span>( <span class="ruby-ivar">@algorithms</span>[ <span class="ruby-identifier">:hmac</span> ],
210: <span class="ruby-identifier">mac_algorithms_server_to_client</span> )
211: <span class="ruby-keyword kw">unless</span> <span class="ruby-identifier">mac_algorithm_s2c</span>
212: <span class="ruby-identifier">raise</span> <span class="ruby-constant">Net</span><span class="ruby-operator">::</span><span class="ruby-constant">SSH</span><span class="ruby-operator">::</span><span class="ruby-constant">Exception</span>,
213: <span class="ruby-value str">"could not settle on server-to-client HMAC algorithm"</span>
214: <span class="ruby-keyword kw">end</span>
215: <span class="ruby-keyword kw">if</span> <span class="ruby-ivar">@logger</span>.<span class="ruby-identifier">debug?</span>
216: <span class="ruby-ivar">@logger</span>.<span class="ruby-identifier">debug</span> <span class="ruby-value str">"hmac algorithm (server-to-client): "</span> <span class="ruby-operator">+</span>
217: <span class="ruby-identifier">mac_algorithm_s2c</span>
218: <span class="ruby-keyword kw">end</span>
219:
220: <span class="ruby-identifier">compression_algorithm_c2s</span> = <span class="ruby-identifier">first_matching_element</span>(
221: <span class="ruby-ivar">@algorithms</span>[ <span class="ruby-identifier">:compression</span> ],
222: <span class="ruby-identifier">compression_algorithms_client_to_server</span> )
223: <span class="ruby-keyword kw">unless</span> <span class="ruby-identifier">compression_algorithm_c2s</span>
224: <span class="ruby-identifier">raise</span> <span class="ruby-constant">Net</span><span class="ruby-operator">::</span><span class="ruby-constant">SSH</span><span class="ruby-operator">::</span><span class="ruby-constant">Exception</span>,
225: <span class="ruby-value str">"could not settle on client-to-server compression algorithm"</span>
226: <span class="ruby-keyword kw">end</span>
227: <span class="ruby-keyword kw">if</span> <span class="ruby-ivar">@logger</span>.<span class="ruby-identifier">debug?</span>
228: <span class="ruby-ivar">@logger</span>.<span class="ruby-identifier">debug</span> <span class="ruby-value str">"compression algorithm (client-to-server): "</span> <span class="ruby-operator">+</span>
229: <span class="ruby-identifier">compression_algorithm_c2s</span>
230: <span class="ruby-keyword kw">end</span>
231:
232: <span class="ruby-identifier">compression_algorithm_s2c</span> = <span class="ruby-identifier">first_matching_element</span>(
233: <span class="ruby-ivar">@algorithms</span>[ <span class="ruby-identifier">:compression</span> ],
234: <span class="ruby-identifier">compression_algorithms_server_to_client</span> )
235: <span class="ruby-keyword kw">unless</span> <span class="ruby-identifier">compression_algorithm_s2c</span>
236: <span class="ruby-identifier">raise</span> <span class="ruby-constant">Net</span><span class="ruby-operator">::</span><span class="ruby-constant">SSH</span><span class="ruby-operator">::</span><span class="ruby-constant">Exception</span>,
237: <span class="ruby-value str">"could not settle on server-to-client compression algorithm"</span>
238: <span class="ruby-keyword kw">end</span>
239: <span class="ruby-keyword kw">if</span> <span class="ruby-ivar">@logger</span>.<span class="ruby-identifier">debug?</span>
240: <span class="ruby-ivar">@logger</span>.<span class="ruby-identifier">debug</span> <span class="ruby-value str">"compression algorithm (server-to-client): "</span> <span class="ruby-operator">+</span>
241: <span class="ruby-identifier">compression_algorithm_s2c</span>
242: <span class="ruby-keyword kw">end</span>
243:
244: <span class="ruby-identifier">language_c2s</span> = <span class="ruby-identifier">first_matching_element</span>( <span class="ruby-ivar">@algorithms</span>[ <span class="ruby-identifier">:languages</span> ],
245: <span class="ruby-identifier">languages_client_to_server</span> ) <span class="ruby-operator">||</span> <span class="ruby-value str">""</span>
246: <span class="ruby-keyword kw">if</span> <span class="ruby-ivar">@logger</span>.<span class="ruby-identifier">debug?</span>
247: <span class="ruby-ivar">@logger</span>.<span class="ruby-identifier">debug</span> <span class="ruby-node">"language (client-to-server): #{language_c2s}"</span>
248: <span class="ruby-keyword kw">end</span>
249:
250: <span class="ruby-identifier">language_s2c</span> = <span class="ruby-identifier">first_matching_element</span>( <span class="ruby-ivar">@algorithms</span>[ <span class="ruby-identifier">:languages</span> ],
251: <span class="ruby-identifier">languages_server_to_client</span> ) <span class="ruby-operator">||</span> <span class="ruby-value str">""</span>
252: <span class="ruby-keyword kw">if</span> <span class="ruby-ivar">@logger</span>.<span class="ruby-identifier">debug?</span>
253: <span class="ruby-ivar">@logger</span>.<span class="ruby-identifier">debug</span> <span class="ruby-node">"language (server-to-client): #{language_s2c}"</span>
254: <span class="ruby-keyword kw">end</span>
255:
256: <span class="ruby-keyword kw">return</span> <span class="ruby-constant">Algorithms</span>.<span class="ruby-identifier">new</span>( <span class="ruby-identifier">server_algorithm_packet</span>,
257: <span class="ruby-identifier">client_algorithm_packet</span>,
258: <span class="ruby-identifier">kex_algorithm</span>,
259: <span class="ruby-identifier">host_key_algorithm</span>,
260: <span class="ruby-identifier">encryption_algorithm_c2s</span>,
261: <span class="ruby-identifier">encryption_algorithm_s2c</span>,
262: <span class="ruby-identifier">mac_algorithm_c2s</span>,
263: <span class="ruby-identifier">mac_algorithm_s2c</span>,
264: <span class="ruby-identifier">compression_algorithm_c2s</span>,
265: <span class="ruby-identifier">compression_algorithm_s2c</span>,
266: <span class="ruby-identifier">language_c2s</span>,
267: <span class="ruby-identifier">language_s2c</span>,
268: <span class="ruby-ivar">@compression_level</span> )
269: <span class="ruby-keyword kw">end</span>
</pre>
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