125 lines
8.0 KiB
HTML
125 lines
8.0 KiB
HTML
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Secure the FTP client with Transport Layer Security or Secure Socket Layer" />
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<meta name="abstract" content="You can use Transport Layer Security (TLS) or Secure Sockets Layer (SSL) connections to encrypt data transferred over File Transfer Protocol (FTP) control and data connections." />
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<title>Secure the FTP client with Transport Layer Security or Secure Socket
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Layer</title>
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<body id="rzaiqtlsssl"><a name="rzaiqtlsssl"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Secure the FTP client with Transport Layer Security or Secure Socket
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Layer</h1>
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<div><p>You can use Transport Layer Security (TLS) or Secure Sockets Layer
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(SSL) connections to encrypt data transferred over File Transfer Protocol
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(FTP) control and data connections.</p>
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<p>The primary reason for encryption on the control connection is to conceal
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the password when logging on to the FTP server.</p>
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<p>Before using the FTP client to make secure connections to servers, you
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must use DCM to configure trusted certificate authorities for the FTP Client.
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Any certificate authorities which were used to create certificates assigned
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to servers that you want to connect to must be added. Exporting or importing
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Certificate Authority (CA) certificates might be required depending on the
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CAs used. Refer to Define a CA trust list for an application in the DCM topic
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for more information about CA trusted authorities.</p>
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<p>If you choose TLS or SSL encryption for the control connection, the FTP
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client will also encrypt the data sent on the FTP data connection by default.
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FTP protocol does not allow you to have a secure data connection without a
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secure control connection.</p>
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<p>Encryption can have a significant performance cost and can be bypassed
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on the data connection. This allows you to transfer non-sensitive files without
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decreasing performance and still protect the system's security by not exposing
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passwords.</p>
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<p>The FTP client has parameters for the STRTCPFTP CL command and subcommands
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which are used as part of the TLS or SSL support (SECOpen and SECData).</p>
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<div class="section"><h4 class="sectiontitle">Specifying Transport Layer Security or Secure Socket Layer
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protection for the iSeries™ FTP client</h4><dl><dt class="dlterm">Control connection</dt>
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<dd>TLS/SSL protection can be specified on the STRTCPFTP command and the SECOPEN
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subcommand.<p>For the STRTCPFTP (FTP) command, specify *SSL for the SECCNN
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secure connection parameter to request a secure control connection. Also,
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you might be able to specify *IMPLICIT to obtain a secure connection on a
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pre-defined server port number.</p>
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<p>Within your FTP client session, the
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SECOPEN subcommand can be used to obtain a secure control connection.</p>
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</dd>
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<dt class="dlterm">Data connection</dt>
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<dd>For the STRTCPFTP (FTP) command, enter *PRIVATE for the DTAPROT data protection
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parameter to specify a secure data connection. Enter *CLEAR for the DTAPROT
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data protection parameter to specify data to be sent without encryption.<p>When
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you have a secure control connection, you can use the SECDATA subcommand to
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change the data connection protection level.</p>
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</dd>
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<dt class="dlterm">Implicit SSL connection</dt>
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<dd>Some FTP servers support what is called an implicit SSL connection. This
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connection provides the same encryption protection as the *SSL option, but
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can only be done on a pre-determined server port, typically 990, for which
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the server must be configured to expect an SSL or TLS connection negotiation.<p>This
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method is provided to allow secure connections to those FTP implementations
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that cannot support the standard protocol for providing TLS or SSL protection.</p>
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<p>Many
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early implementations of SSL support used the implicit approach, but now it
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has been deprecated by the IETF.</p>
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</dd>
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</dl>
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<div class="note"><span class="notetitle">Note:</span> <p>The standard protocol for setting up an TLS or SSL
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connection requires that the AUTH (Authorization) server subcommand be used
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when making the connection to the server. Also, the server subcommands PBSZ
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and PROT are used to specify the data protection level.</p>
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<p>However, for
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an implicit SSL connection, the AUTH, PBSZ, and PROT server subcommands are <span class="uicontrol">not</span> sent
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to the server. Instead, the server will act as if the client had sent these
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subcommands with the parameters shown below:</p>
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<ul><li>AUTH SSL</li>
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<li>PBSZ 0</li>
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<li>PROT P</li>
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</ul>
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</div>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzaiqrzaiqimplement.htm" title="You can protect your data by securing File Transfer Protocol (FTP) with Secure Sockets Layer (SSL), monitoring FTP users, and managing user access to FTP functions.">Secure File Transfer Protocol</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rzaiqsslparent.htm" title="With Secure Sockets Layer (SSL) you can eliminate the exposure of transmitting passwords and data in the clear when using the i5/OS File Transfer Protocol (FTP) server with an FTP client that also uses SSL.">Use Secure Sockets Layer to secure the File Transfer Protocol server</a></div>
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</div>
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<div class="reltasks"><strong>Related tasks</strong><br />
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<div><a href="../rzahu/rzahumngcaapptrust.htm">Define a CA trust list for an application</a></div>
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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<div><a href="rzaiqrzaiqclientsession.htm" title="You can start and stop a client session from this topic.">Start and stop a client session</a></div>
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<div><a href="rzaiqsecopen.htm">SECOpen (Setting Data Security Protection)</a></div>
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<div><a href="rzaiqsecdata.htm">SECData (Setting Data Security Protection)</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="rzaiqscenariossl.htm" title="Use Secure Sockets Layer (SSL) to secure data being transferred to your partner company.">Scenario: Secure File Transfer Protocol with Secure Sockets Layer</a></div>
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</div>
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</div>
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</body>
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