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<a href="https://gitlab.com/airtower-luna">Airtower</a>
commented on a discussion
on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/768#note_106989051">doc/cha-gtls-app.texi</a>:
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<pre style="margin: 0;"> <span id="LC1715" class="line" lang="plaintext">and authentication keys using @funcref{gnutls_session_ticket_key_generate}.</span>
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<pre style="margin: 0;"> <span id="LC1716" class="line" lang="plaintext">Those keys should be associated with the GnuTLS session using</span>
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<td class="diff-line-num new_line old" data-linenumber="1717" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1717" class="line" lang="plaintext">@funcref{gnutls_session_ticket_enable_server}, and should be rotated regularly</span>
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<td class="diff-line-num new_line old" data-linenumber="1717" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1718" class="line" lang="plaintext">(e.g., every few hours), to prevent them from becoming long-term keys which</span>
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<td class="diff-line-num new_line old" data-linenumber="1717" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1719" class="line" lang="plaintext">if revealed could be used to decrypt all previous sessions.</span>
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<td class="diff-line-num new new_line" data-linenumber="1717" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC1717" class="line" lang="plaintext">@funcref{gnutls_session_ticket_enable_server}.</span>
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<td class="diff-line-num new new_line" data-linenumber="1718" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC1718" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC1719" class="line" lang="plaintext">GnuTLS will rotate these keys regularly. The key rotation interval can be specified with</span>
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<pre style="margin: 0;">+<span id="LC1720" class="line" lang="plaintext">@funcref{gnutls_db_set_cache_expiration}. Every such interval, new keys will be generated from the initial keys</span>
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<pre style="margin: 0;">+<span id="LC1721" class="line" lang="plaintext">that were first established using @funcref{gnutls_session_ticket_enable_server}. This is</span>
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<pre style="margin: 0;">+<span id="LC1722" class="line" lang="plaintext">a necessary mechanism to prevent the keys from becoming long-term keys and as such preserve</span>
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<pre style="margin: 0;">+<span id="LC1723" class="line" lang="plaintext">forward-secrecy in the issued session tickets.</span>
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<pre style="margin: 0;">+<span id="LC1724" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC1725" class="line" lang="plaintext">The master key and the rotation key mechanism will both survive across forks. Forked processes</span>
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<pre style="margin: 0;">+<span id="LC1726" class="line" lang="plaintext">should rotate the key all at the same time and should generate exactly the same new keys.</span>
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<pre style="margin: 0;">+<span id="LC1727" class="line" lang="plaintext">This of course assumes all processes have the same time, which should be true.</span>
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<p dir="auto">I agree that the transfer should be done by the application. However, to implement that the application developer needs to know whether transferring the content of the <code>gnutls_datum_t</code> filled by <code>gnutls_session_ticket_key_generate</code> will work across machines that may have different architectures.</p>
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