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<a href="https://gitlab.com/airtower-luna">Airtower</a>
started a new discussion
on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/768#note_106767939">doc/cha-gtls-app.texi</a>:
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<td class="diff-line-num new_line" data-linenumber="1714" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC1714" class="line" lang="plaintext">A server supporting session tickets must generate ticket encryption</span>
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<td class="diff-line-num old_line" data-linenumber="1715" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="1715" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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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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<td class="diff-line-num old_line" data-linenumber="1716" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="1716" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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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 old old_line" 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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<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 old old_line" data-linenumber="1718" 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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<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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<td class="diff-line-num new new_line" data-linenumber="1721" 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="LC1721" class="line" lang="plaintext">that were first established using @funcref{gnutls_session_ticket_enable_server}. This is</span>
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<td class="diff-line-num new new_line" data-linenumber="1722" 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="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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<td class="diff-line-num new new_line" data-linenumber="1723" 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="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 key generated with @funcref{gnutls_session_ticket_key_generate} will survive across forks.</span>
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<p dir="auto">I'm not sure what you mean by this paragraph. Does that mean that sessions won't stay the same across forks, or may the master keys start to diverge after forks as the processes call <code>gnutls_session_ticket_enable_server()</code>? The former is no problem from my point of view. In the latter case, multi-process servers like Apache with mod_gnutls would need some way to synchronize keys (which would also be useful for server clusters anyway).</p>
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