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<title>Class: Net::SSH::Transport::AlgorithmNegotiator</title>
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<div id="classHeader">
<table class="header-table">
<tr class="top-aligned-row">
<td><strong>Class</strong></td>
<td class="class-name-in-header">Net::SSH::Transport::AlgorithmNegotiator</td>
</tr>
<tr class="top-aligned-row">
<td><strong>In:</strong></td>
<td>
<a href="../../../../files/lib/net/ssh/transport/algorithm-negotiator_rb.html">
lib/net/ssh/transport/algorithm-negotiator.rb
</a>
<br />
</td>
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<td><strong>Parent:</strong></td>
<td>
Object
</td>
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<!-- banner header -->
<div id="bodyContent">
<div id="contextContent">
<div id="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>
<div id="method-list">
<h3 class="section-bar">Methods</h3>
<div class="name-list">
<a href="#M000070">negotiate</a>
<a href="#M000069">new</a>
</div>
</div>
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<!-- if includes -->
<div id="includes">
<h3 class="section-bar">Included Modules</h3>
<div id="includes-list">
<span class="include-name"><a href="Constants.html">Constants</a></span>
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<div id="section">
<div id="constants-list">
<h3 class="section-bar">Constants</h3>
<div class="name-list">
<table summary="Constants">
<tr class="top-aligned-row context-row">
<td class="context-item-name">Algorithms</td>
<td>=</td>
<td class="context-item-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>
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<!-- if method_list -->
<div id="methods">
<h3 class="section-bar">Public Class methods</h3>
<div id="method-M000069" class="method-detail">
<a name="M000069"></a>
<div class="method-heading">
<a href="#M000069" class="method-signature">
<span class="method-name">new</span><span class="method-args">( logger, algorithms, buffers )</span>
</a>
</div>
<div class="method-description">
<p>
Create a new <a href="AlgorithmNegotiator.html">AlgorithmNegotiator</a>
instance, using the given logger, set of default algorithms, and buffer
factory.
</p>
<p><a class="source-toggle" href="#"
onclick="toggleCode('M000069-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000069-source">
<pre>
<span class="ruby-comment cmt"># File lib/net/ssh/transport/algorithm-negotiator.rb, line 45</span>
45: <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> )
46: <span class="ruby-ivar">@default_algorithms</span> = <span class="ruby-identifier">algorithms</span>
47: <span class="ruby-ivar">@buffers</span> = <span class="ruby-identifier">buffers</span>
48: <span class="ruby-ivar">@logger</span> = <span class="ruby-identifier">logger</span>
49: <span class="ruby-keyword kw">end</span>
</pre>
</div>
</div>
</div>
<h3 class="section-bar">Public Instance methods</h3>
<div id="method-M000070" class="method-detail">
<a name="M000070"></a>
<div class="method-heading">
<a href="#M000070" class="method-signature">
<span class="method-name">negotiate</span><span class="method-args">( session, options )</span>
</a>
</div>
<div class="method-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>
<p><a class="source-toggle" href="#"
onclick="toggleCode('M000070-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000070-source">
<pre>
<span class="ruby-comment cmt"># File lib/net/ssh/transport/algorithm-negotiator.rb, line 101</span>
101: <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> )
102: <span class="ruby-identifier">prepare_preferred_algorithms</span> <span class="ruby-identifier">options</span>
103:
104: <span class="ruby-comment cmt"># first, discover what the server can do</span>
105: <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>
106: <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>
107:
108: <span class="ruby-identifier">server_algorithm_packet</span> = <span class="ruby-identifier">buffer</span>.<span class="ruby-identifier">content</span>
109:
110: <span class="ruby-identifier">cookie</span> = <span class="ruby-identifier">buffer</span>.<span class="ruby-identifier">read</span>( <span class="ruby-value">16</span> )
111: <span class="ruby-identifier">kex_algorithms</span> = <span class="ruby-identifier">buffer</span>.<span class="ruby-identifier">read_string</span>
112: <span class="ruby-identifier">server_host_key_algorithms</span> = <span class="ruby-identifier">buffer</span>.<span class="ruby-identifier">read_string</span>
113: <span class="ruby-identifier">encryption_algorithms_client_to_server</span> = <span class="ruby-identifier">buffer</span>.<span class="ruby-identifier">read_string</span>
114: <span class="ruby-identifier">encryption_algorithms_server_to_client</span> = <span class="ruby-identifier">buffer</span>.<span class="ruby-identifier">read_string</span>
115: <span class="ruby-identifier">mac_algorithms_client_to_server</span> = <span class="ruby-identifier">buffer</span>.<span class="ruby-identifier">read_string</span>
116: <span class="ruby-identifier">mac_algorithms_server_to_client</span> = <span class="ruby-identifier">buffer</span>.<span class="ruby-identifier">read_string</span>
117: <span class="ruby-identifier">compression_algorithms_client_to_server</span> = <span class="ruby-identifier">buffer</span>.<span class="ruby-identifier">read_string</span>
118: <span class="ruby-identifier">compression_algorithms_server_to_client</span> = <span class="ruby-identifier">buffer</span>.<span class="ruby-identifier">read_string</span>
119: <span class="ruby-identifier">languages_client_to_server</span> = <span class="ruby-identifier">buffer</span>.<span class="ruby-identifier">read_string</span>
120: <span class="ruby-identifier">languages_server_to_client</span> = <span class="ruby-identifier">buffer</span>.<span class="ruby-identifier">read_string</span>
121: <span class="ruby-identifier">first_kex_packet_follows</span> = <span class="ruby-identifier">buffer</span>.<span class="ruby-identifier">read_bool</span>
122: <span class="ruby-identifier">zero</span> = <span class="ruby-identifier">buffer</span>.<span class="ruby-identifier">read_long</span>
123:
124: <span class="ruby-comment cmt"># TODO: if first_kex_packet_follows, we need to try to skip the</span>
125: <span class="ruby-comment cmt"># actual kexinit stuff and try to guess what the server is doing...</span>
126: <span class="ruby-comment cmt"># need to read more about this scenario.</span>
127:
128: <span class="ruby-comment cmt"># next, tell the server what we can do</span>
129:
130: <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> )
131: <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> )
132: <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> )
133: <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> )
134: <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> )
135: <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> )
136:
137: <span class="ruby-identifier">msg</span> = <span class="ruby-ivar">@buffers</span>.<span class="ruby-identifier">writer</span>
138: <span class="ruby-identifier">msg</span>.<span class="ruby-identifier">write_byte</span> <span class="ruby-constant">KEXINIT</span>
139: <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>),
140: <span class="ruby-identifier">rand</span>(<span class="ruby-value">0x</span><span class="ruby-constant">FFFFFFFF</span>)
141: <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>
142: <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>
143: <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>
144: <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>
145: <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>
146: <span class="ruby-identifier">msg</span>.<span class="ruby-identifier">write_bool</span> <span class="ruby-keyword kw">false</span>
147: <span class="ruby-identifier">msg</span>.<span class="ruby-identifier">write_long</span> <span class="ruby-value">0</span>
148:
149: <span class="ruby-identifier">client_algorithm_packet</span> = <span class="ruby-identifier">msg</span>.<span class="ruby-identifier">to_s</span>
150: <span class="ruby-identifier">session</span>.<span class="ruby-identifier">send_message</span> <span class="ruby-identifier">msg</span>
151:
152: <span class="ruby-comment cmt"># negotiate algorithms</span>
153:
154: <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> ],
155: <span class="ruby-identifier">kex_algorithms</span> )
156: <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>,
157: <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>
158: <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>
159:
160: <span class="ruby-identifier">host_key_algorithm</span> = <span class="ruby-identifier">first_matching_element</span>(
161: <span class="ruby-ivar">@algorithms</span>[ <span class="ruby-identifier">:host_key</span> ], <span class="ruby-identifier">server_host_key_algorithms</span> )
162: <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>,
163: <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>
164: <span class="ruby-keyword kw">if</span> <span class="ruby-ivar">@logger</span>.<span class="ruby-identifier">debug?</span>
165: <span class="ruby-ivar">@logger</span>.<span class="ruby-identifier">debug</span> <span class="ruby-node">"host key algorithm: #{host_key_algorithm}"</span>
166: <span class="ruby-keyword kw">end</span>
167:
168: <span class="ruby-identifier">encryption_algorithm_c2s</span> = <span class="ruby-identifier">first_matching_element</span>(
169: <span class="ruby-ivar">@algorithms</span>[ <span class="ruby-identifier">:encryption</span> ], <span class="ruby-identifier">encryption_algorithms_client_to_server</span> )
170: <span class="ruby-keyword kw">unless</span> <span class="ruby-identifier">encryption_algorithm_c2s</span>
171: <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>,
172: <span class="ruby-value str">"could not settle on client-to-server encryption algorithm"</span>
173: <span class="ruby-keyword kw">end</span>
174: <span class="ruby-keyword kw">if</span> <span class="ruby-ivar">@logger</span>.<span class="ruby-identifier">debug?</span>
175: <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>
176: <span class="ruby-identifier">encryption_algorithm_c2s</span>
177: <span class="ruby-keyword kw">end</span>
178:
179: <span class="ruby-identifier">encryption_algorithm_s2c</span> = <span class="ruby-identifier">first_matching_element</span>(
180: <span class="ruby-ivar">@algorithms</span>[ <span class="ruby-identifier">:encryption</span> ], <span class="ruby-identifier">encryption_algorithms_server_to_client</span> )
181: <span class="ruby-keyword kw">unless</span> <span class="ruby-identifier">encryption_algorithm_s2c</span>
182: <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>,
183: <span class="ruby-value str">"could not settle on server-to-client encryption algorithm"</span>
184: <span class="ruby-keyword kw">end</span>
185: <span class="ruby-keyword kw">if</span> <span class="ruby-ivar">@logger</span>.<span class="ruby-identifier">debug?</span>
186: <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>
187: <span class="ruby-identifier">encryption_algorithm_s2c</span>
188: <span class="ruby-keyword kw">end</span>
189:
190: <span class="ruby-identifier">mac_algorithm_c2s</span> = <span class="ruby-identifier">first_matching_element</span>(
191: <span class="ruby-ivar">@algorithms</span>[ <span class="ruby-identifier">:hmac</span> ], <span class="ruby-identifier">mac_algorithms_client_to_server</span> )
192: <span class="ruby-keyword kw">unless</span> <span class="ruby-identifier">mac_algorithm_c2s</span>
193: <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>,
194: <span class="ruby-value str">"could not settle on client-to-server HMAC algorithm"</span>
195: <span class="ruby-keyword kw">end</span>
196: <span class="ruby-keyword kw">if</span> <span class="ruby-ivar">@logger</span>.<span class="ruby-identifier">debug?</span>
197: <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>
198: <span class="ruby-identifier">mac_algorithm_c2s</span>
199: <span class="ruby-keyword kw">end</span>
200:
201: <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> ],
202: <span class="ruby-identifier">mac_algorithms_server_to_client</span> )
203: <span class="ruby-keyword kw">unless</span> <span class="ruby-identifier">mac_algorithm_s2c</span>
204: <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>,
205: <span class="ruby-value str">"could not settle on server-to-client HMAC algorithm"</span>
206: <span class="ruby-keyword kw">end</span>
207: <span class="ruby-keyword kw">if</span> <span class="ruby-ivar">@logger</span>.<span class="ruby-identifier">debug?</span>
208: <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>
209: <span class="ruby-identifier">mac_algorithm_s2c</span>
210: <span class="ruby-keyword kw">end</span>
211:
212: <span class="ruby-identifier">compression_algorithm_c2s</span> = <span class="ruby-identifier">first_matching_element</span>(
213: <span class="ruby-ivar">@algorithms</span>[ <span class="ruby-identifier">:compression</span> ],
214: <span class="ruby-identifier">compression_algorithms_client_to_server</span> )
215: <span class="ruby-keyword kw">unless</span> <span class="ruby-identifier">compression_algorithm_c2s</span>
216: <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>,
217: <span class="ruby-value str">"could not settle on client-to-server compression algorithm"</span>
218: <span class="ruby-keyword kw">end</span>
219: <span class="ruby-keyword kw">if</span> <span class="ruby-ivar">@logger</span>.<span class="ruby-identifier">debug?</span>
220: <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>
221: <span class="ruby-identifier">compression_algorithm_c2s</span>
222: <span class="ruby-keyword kw">end</span>
223:
224: <span class="ruby-identifier">compression_algorithm_s2c</span> = <span class="ruby-identifier">first_matching_element</span>(
225: <span class="ruby-ivar">@algorithms</span>[ <span class="ruby-identifier">:compression</span> ],
226: <span class="ruby-identifier">compression_algorithms_server_to_client</span> )
227: <span class="ruby-keyword kw">unless</span> <span class="ruby-identifier">compression_algorithm_s2c</span>
228: <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>,
229: <span class="ruby-value str">"could not settle on server-to-client compression algorithm"</span>
230: <span class="ruby-keyword kw">end</span>
231: <span class="ruby-keyword kw">if</span> <span class="ruby-ivar">@logger</span>.<span class="ruby-identifier">debug?</span>
232: <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>
233: <span class="ruby-identifier">compression_algorithm_s2c</span>
234: <span class="ruby-keyword kw">end</span>
235:
236: <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> ],
237: <span class="ruby-identifier">languages_client_to_server</span> ) <span class="ruby-operator">||</span> <span class="ruby-value str">""</span>
238: <span class="ruby-keyword kw">if</span> <span class="ruby-ivar">@logger</span>.<span class="ruby-identifier">debug?</span>
239: <span class="ruby-ivar">@logger</span>.<span class="ruby-identifier">debug</span> <span class="ruby-node">"language (client-to-server): #{language_c2s}"</span>
240: <span class="ruby-keyword kw">end</span>
241:
242: <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> ],
243: <span class="ruby-identifier">languages_server_to_client</span> ) <span class="ruby-operator">||</span> <span class="ruby-value str">""</span>
244: <span class="ruby-keyword kw">if</span> <span class="ruby-ivar">@logger</span>.<span class="ruby-identifier">debug?</span>
245: <span class="ruby-ivar">@logger</span>.<span class="ruby-identifier">debug</span> <span class="ruby-node">"language (server-to-client): #{language_s2c}"</span>
246: <span class="ruby-keyword kw">end</span>
247:
248: <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>,
249: <span class="ruby-identifier">client_algorithm_packet</span>,
250: <span class="ruby-identifier">kex_algorithm</span>,
251: <span class="ruby-identifier">host_key_algorithm</span>,
252: <span class="ruby-identifier">encryption_algorithm_c2s</span>,
253: <span class="ruby-identifier">encryption_algorithm_s2c</span>,
254: <span class="ruby-identifier">mac_algorithm_c2s</span>,
255: <span class="ruby-identifier">mac_algorithm_s2c</span>,
256: <span class="ruby-identifier">compression_algorithm_c2s</span>,
257: <span class="ruby-identifier">compression_algorithm_s2c</span>,
258: <span class="ruby-identifier">language_c2s</span>,
259: <span class="ruby-identifier">language_s2c</span>,
260: <span class="ruby-ivar">@compression_level</span> )
261: <span class="ruby-keyword kw">end</span>
</pre>
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