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Jean-Paul Calderone215d51b2009-11-13 09:19:21 -0500[diff] [blame]44
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]45<H2><A NAME="SECTION000430000000000000000">&nbsp;</A>
46<BR>
473.3 <tt class="module">SSL</tt> -- An interface to the SSL-specific parts of OpenSSL
48</H2>
Jean-Paul Calderone2aa2b332008-03-06 21:43:14 -0500[diff] [blame]49
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]50<P>
Jean-Paul Calderone2aa2b332008-03-06 21:43:14 -0500[diff] [blame]51
52
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]53<P>
Jean-Paul Calderone2aa2b332008-03-06 21:43:14 -0500[diff] [blame]54This module handles things specific to SSL. There are two objects defined:
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]55Context, Connection.
Jean-Paul Calderone2aa2b332008-03-06 21:43:14 -0500[diff] [blame]56
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]57<P>
Jean-Paul Calderone7fd9c562011-08-14 18:19:17 -0400[diff] [blame]58<dl><dt><b><a name='l2h-129'><tt>SSLv2_METHOD</tt></a></b>
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]59<dd>
Jean-Paul Calderone7fd9c562011-08-14 18:19:17 -0400[diff] [blame]60<dt><b><a name='l2h-146'><tt>SSLv3_METHOD</tt></a></b><dd>
61<dt><b><a name='l2h-147'><tt>SSLv23_METHOD</tt></a></b><dd>
62<dt><b><a name='l2h-148'><tt>TLSv1_METHOD</tt></a></b><dd>
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]63These constants represent the different SSL methods to use when creating a
64context object.
65</dl>
Jean-Paul Calderone2aa2b332008-03-06 21:43:14 -0500[diff] [blame]66
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]67<P>
Jean-Paul Calderone7fd9c562011-08-14 18:19:17 -0400[diff] [blame]68<dl><dt><b><a name='l2h-130'><tt>VERIFY_NONE</tt></a></b>
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]69<dd>
Jean-Paul Calderone7fd9c562011-08-14 18:19:17 -0400[diff] [blame]70<dt><b><a name='l2h-149'><tt>VERIFY_PEER</tt></a></b><dd>
71<dt><b><a name='l2h-150'><tt>VERIFY_FAIL_IF_NO_PEER_CERT</tt></a></b><dd>
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]72These constants represent the verification mode used by the Context
73object's <tt class="method">set_verify</tt> method.
74</dl>
Jean-Paul Calderone2aa2b332008-03-06 21:43:14 -0500[diff] [blame]75
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]76<P>
Jean-Paul Calderone7fd9c562011-08-14 18:19:17 -0400[diff] [blame]77<dl><dt><b><a name='l2h-131'><tt>FILETYPE_PEM</tt></a></b>
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]78<dd>
Jean-Paul Calderone7fd9c562011-08-14 18:19:17 -0400[diff] [blame]79<dt><b><a name='l2h-151'><tt>FILETYPE_ASN1</tt></a></b><dd>
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]80File type constants used with the <tt class="method">use_certificate_file</tt> and
81<tt class="method">use_privatekey_file</tt> methods of Context objects.
82</dl>
Jean-Paul Calderone2aa2b332008-03-06 21:43:14 -0500[diff] [blame]83
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]84<P>
Jean-Paul Calderone7fd9c562011-08-14 18:19:17 -0400[diff] [blame]85<dl><dt><b><a name='l2h-132'><tt>OP_SINGLE_DH_USE</tt></a></b>
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]86<dd>
Jean-Paul Calderone7fd9c562011-08-14 18:19:17 -0400[diff] [blame]87<dt><b><a name='l2h-152'><tt>OP_EPHEMERAL_RSA</tt></a></b><dd>
88<dt><b><a name='l2h-153'><tt>OP_NO_SSLv2</tt></a></b><dd>
89<dt><b><a name='l2h-154'><tt>OP_NO_SSLv3</tt></a></b><dd>
90<dt><b><a name='l2h-155'><tt>OP_NO_TLSv1</tt></a></b><dd>
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]91Constants used with <tt class="method">set_options</tt> of Context objects.
92<tt class="constant">OP_SINGLE_DH_USE</tt> means to always create a new key when using ephemeral
93Diffie-Hellman. <tt class="constant">OP_EPHEMERAL_RSA</tt> means to always use ephemeral RSA keys
94when doing RSA operations. <tt class="constant">OP_NO_SSLv2</tt>, <tt class="constant">OP_NO_SSLv3</tt> and
95<tt class="constant">OP_NO_TLSv1</tt> means to disable those specific protocols. This is
96interesting if you're using e.g. <tt class="constant">SSLv23_METHOD</tt> to get an SSLv2-compatible
97handshake, but don't want to use SSLv2.
98</dl>
Jean-Paul Calderone2aa2b332008-03-06 21:43:14 -0500[diff] [blame]99
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]100<P>
Jean-Paul Calderone7fd9c562011-08-14 18:19:17 -0400[diff] [blame]101<dl><dt><b><a name='l2h-133'><tt>SSLEAY_VERSION</tt></a></b>
102<dd>
103<dt><b><a name='l2h-156'><tt>SSLEAY_CFLAGS</tt></a></b><dd>
104<dt><b><a name='l2h-157'><tt>SSLEAY_BUILT_ON</tt></a></b><dd>
105<dt><b><a name='l2h-158'><tt>SSLEAY_PLATFORM</tt></a></b><dd>
106<dt><b><a name='l2h-159'><tt>SSLEAY_DIR</tt></a></b><dd>
107Constants used with <tt class="method">SSLeay_version</tt> to specify what OpenSSL version
108information to retrieve. See the man page for the <tt class="function">SSLeay_version</tt> C
109API for details.
110</dl>
111
112<P>
113<dl><dt><b><a name='l2h-134'><tt>OPENSSL_VERSION_NUMBER</tt></a></b>
114<dd>
115An integer giving the version number of the OpenSSL library used to build this
116version of pyOpenSSL. See the man page for the <tt class="function">SSLeay_version</tt> C API
117for details.
118</dl>
119
120<P>
121<dl><dt><b><a name='l2h-135'><tt class='function'>SSLeay_version</tt></a></b>(<var>type</var>)
122<dd>
123Retrieve a string describing some aspect of the underlying OpenSSL version. The
124type passed in should be one of the <tt class="constant">SSLEAY_*</tt> constants defined in
125this module.
126</dl>
127
128<P>
129<dl><dt><b><a name='l2h-136'><tt>ContextType</tt></a></b>
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]130<dd>
Jean-Paul Calderone215d51b2009-11-13 09:19:21 -0500[diff] [blame]131See <tt class="class">Context</tt>.
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]132</dl>
Jean-Paul Calderone2aa2b332008-03-06 21:43:14 -0500[diff] [blame]133
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]134<P>
Jean-Paul Calderone7fd9c562011-08-14 18:19:17 -0400[diff] [blame]135<dl><dt><b>class <a name='l2h-137'><tt class='class'>Context</tt></a></b>(<var>method</var>)
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]136<dd>
Jean-Paul Calderone215d51b2009-11-13 09:19:21 -0500[diff] [blame]137A class representing SSL contexts. Contexts define the parameters of one or
138more SSL connections.
139
140<P>
141<var>method</var> should be <tt class="constant">SSLv2_METHOD</tt>, <tt class="constant">SSLv3_METHOD</tt>,
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]142<tt class="constant">SSLv23_METHOD</tt> or <tt class="constant">TLSv1_METHOD</tt>.
143</dl>
Jean-Paul Calderone2aa2b332008-03-06 21:43:14 -0500[diff] [blame]144
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]145<P>
Jean-Paul Calderone7fd9c562011-08-14 18:19:17 -0400[diff] [blame]146<dl><dt><b><a name='l2h-138'><tt>ConnectionType</tt></a></b>
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]147<dd>
Jean-Paul Calderone215d51b2009-11-13 09:19:21 -0500[diff] [blame]148See <tt class="class">Connection</tt>.
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]149</dl>
Jean-Paul Calderone2aa2b332008-03-06 21:43:14 -0500[diff] [blame]150
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]151<P>
Jean-Paul Calderone7fd9c562011-08-14 18:19:17 -0400[diff] [blame]152<dl><dt><b>class <a name='l2h-139'><tt class='class'>Connection</tt></a></b>(<var>context, socket</var>)
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]153<dd>
Jean-Paul Calderone215d51b2009-11-13 09:19:21 -0500[diff] [blame]154A class representing SSL connections.
155
156<P>
157<var>context</var> should be an instance of <tt class="class">Context</tt> and <var>socket</var>
158should be a socket <A NAME="tex2html4"
Jean-Paul Calderone7fd9c562011-08-14 18:19:17 -0400[diff] [blame]159 HREF="#foot1276"><SUP>3</SUP></A> object. <var>socket</var> may be
Jean-Paul Calderone215d51b2009-11-13 09:19:21 -0500[diff] [blame]160<var>None</var>; in this case, the Connection is created with a memory BIO: see
161the <tt class="method">bio_read</tt>, <tt class="method">bio_write</tt>, and <tt class="method">bio_shutdown</tt>
162methods.
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]163</dl>
Jean-Paul Calderone2aa2b332008-03-06 21:43:14 -0500[diff] [blame]164
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]165<P>
Jean-Paul Calderone7fd9c562011-08-14 18:19:17 -0400[diff] [blame]166<dl><dt><b>exception <a name='l2h-140'><tt class='exception'>Error</tt></a></b>
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]167<dd>
168This exception is used as a base class for the other SSL-related
169exceptions, but may also be raised directly.
Jean-Paul Calderone2aa2b332008-03-06 21:43:14 -0500[diff] [blame]170
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]171<P>
Jean-Paul Calderone2aa2b332008-03-06 21:43:14 -0500[diff] [blame]172Whenever this exception is raised directly, it has a list of error messages
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]173from the OpenSSL error queue, where each item is a tuple <code>(<var>lib</var>,
174<var>function</var>, <var>reason</var>)</code>. Here <var>lib</var>, <var>function</var> and <var>reason</var>
175are all strings, describing where and what the problem is. See <span class='manpage'><i>err</i>(3)</span>
176for more information.
177</dl>
Jean-Paul Calderone2aa2b332008-03-06 21:43:14 -0500[diff] [blame]178
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]179<P>
Jean-Paul Calderone7fd9c562011-08-14 18:19:17 -0400[diff] [blame]180<dl><dt><b>exception <a name='l2h-141'><tt class='exception'>ZeroReturnError</tt></a></b>
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]181<dd>
182This exception matches the error return code <code>SSL_ERROR_ZERO_RETURN</code>, and
183is raised when the SSL Connection has been closed. In SSL 3.0 and TLS 1.0, this
184only occurs if a closure alert has occurred in the protocol, i.e. the
185connection has been closed cleanly. Note that this does not necessarily
186mean that the transport layer (e.g. a socket) has been closed.
Jean-Paul Calderone2aa2b332008-03-06 21:43:14 -0500[diff] [blame]187
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]188<P>
Jean-Paul Calderone2aa2b332008-03-06 21:43:14 -0500[diff] [blame]189It may seem a little strange that this is an exception, but it does match an
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]190<code>SSL_ERROR</code> code, and is very convenient.
191</dl>
Jean-Paul Calderone2aa2b332008-03-06 21:43:14 -0500[diff] [blame]192
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]193<P>
Jean-Paul Calderone7fd9c562011-08-14 18:19:17 -0400[diff] [blame]194<dl><dt><b>exception <a name='l2h-142'><tt class='exception'>WantReadError</tt></a></b>
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]195<dd>
196The operation did not complete; the same I/O method should be called again
197later, with the same arguments. Any I/O method can lead to this since new
198handshakes can occur at any time.
Jean-Paul Calderone215d51b2009-11-13 09:19:21 -0500[diff] [blame]199
200<P>
201The wanted read is for <i>dirty</i> data sent over the network, not the
202<i>clean</i> data inside the tunnel. For a socket based SSL connection,
203<i>read</i> means data coming at us over the network. Until that read
204succeeds, the attempted <tt class="method">OpenSSL.SSL.Connection.recv</tt>,
205<tt class="method">OpenSSL.SSL.Connection.send</tt>, or
206<tt class="method">OpenSSL.SSL.Connection.do_handshake</tt> is prevented or incomplete. You
207probably want to <tt class="method">select()</tt> on the socket before trying again.
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]208</dl>
Jean-Paul Calderone2aa2b332008-03-06 21:43:14 -0500[diff] [blame]209
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]210<P>
Jean-Paul Calderone7fd9c562011-08-14 18:19:17 -0400[diff] [blame]211<dl><dt><b>exception <a name='l2h-143'><tt class='exception'>WantWriteError</tt></a></b>
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]212<dd>
Jean-Paul Calderone215d51b2009-11-13 09:19:21 -0500[diff] [blame]213See <tt class="exception">WantReadError</tt>. The socket send buffer may be too full to
214write more data.
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]215</dl>
Jean-Paul Calderone2aa2b332008-03-06 21:43:14 -0500[diff] [blame]216
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]217<P>
Jean-Paul Calderone7fd9c562011-08-14 18:19:17 -0400[diff] [blame]218<dl><dt><b>exception <a name='l2h-144'><tt class='exception'>WantX509LookupError</tt></a></b>
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]219<dd>
220The operation did not complete because an application callback has asked to be
221called again. The I/O method should be called again later, with the same
222arguments. Note: This won't occur in this version, as there are no such
223callbacks in this version.
224</dl>
Jean-Paul Calderone2aa2b332008-03-06 21:43:14 -0500[diff] [blame]225
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]226<P>
Jean-Paul Calderone7fd9c562011-08-14 18:19:17 -0400[diff] [blame]227<dl><dt><b>exception <a name='l2h-145'><tt class='exception'>SysCallError</tt></a></b>
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]228<dd>
229The <tt class="exception">SysCallError</tt> occurs when there's an I/O error and OpenSSL's
230error queue does not contain any information. This can mean two things: An
231error in the transport protocol, or an end of file that violates the protocol.
232The parameter to the exception is always a pair <code>(<var>errnum</var>,
233<var>errstr</var>)</code>.
234</dl>
Jean-Paul Calderone2aa2b332008-03-06 21:43:14 -0500[diff] [blame]235
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]236<P>
237<BR><HR><H4>Footnotes</H4>
238<DL>
Jean-Paul Calderone7fd9c562011-08-14 18:19:17 -0400[diff] [blame]239<DT><A NAME="foot1276">... socket</A><A
Jean-Paul Calderonef1b839d2008-09-01 12:06:06 -0400[diff] [blame]240 href="openssl-ssl.html#tex2html4"><SUP>3</SUP></A></DT>
Jean-Paul Calderone215d51b2009-11-13 09:19:21 -0500[diff] [blame]241<DD>Actually, all that is required is an object
242that <i>behaves</i> like a socket, you could even use files, even though
243it'd be tricky to get the handshakes right!
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]244
245</DD>
246</DL>
247<p><hr>
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]248<!--Table of Child-Links-->
249<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>
250
251<UL CLASS="ChildLinks">
Jean-Paul Calderone7fd9c562011-08-14 18:19:17 -0400[diff] [blame]252<LI><A NAME="tex2html289"
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]253 href="openssl-context.html">3.3.1 Context objects </A>
Jean-Paul Calderone7fd9c562011-08-14 18:19:17 -0400[diff] [blame]254<LI><A NAME="tex2html290"
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]255 href="openssl-connection.html">3.3.2 Connection objects </A>
256</UL>
257<!--End of Table of Child-Links-->
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Jean-Paul Calderoneb557e982011-09-02 11:35:12 -0400[diff] [blame]287<span class="release-info">Release 0.13.</span>
Jean-Paul Calderone897bc252008-02-18 20:50:23 -0500[diff] [blame]288</DIV>
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