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<a href="https://gitlab.com/dueno">Daiki Ueno</a>
<a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1752#note_1454471746">commented</a>:
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<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">I had some off-line discussion on what would be the ideal behavior about extended master secret enforcement. There are 3 levels: (1) client doesn't send EMS extension, server doesn't accept EMS extension (= <code style='font-size: 0.875rem; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; margin-top: 0; font-weight: inherit; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>%NO_SESSION_HASH</code>), (2) client sends EMS extension, server accepts EMS extension (= default), and (3) client sends EMS extension, server accepts EMS extension, both require EMS is negotiated (= <code style='font-size: 0.875rem; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; font-weight: inherit; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>%FORCE_SESSION_HASH</code>).</p>
<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">This look analogous to client auth option (1 = nothing, 2 = request, 3 = require), except that (2) is the default in non-FIPS mode, while we probably want (3) as the default in FIPS mode. In the latter case, we probably also want to provide a way to revert it back to (2), for interoperability.</p>
<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">I would propose:</p>
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<li style="margin-top: 0; line-height: 1.6em; margin-left: 25px; padding-left: 3px;">keep the current modifier keywords (<code style='font-size: 0.875rem; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; margin-top: 0; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>%NO_SESSION_HASH</code> and <code style='font-size: 0.875rem; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>%FORCE_SESSION_HASH</code>)</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">add a new configuration option to select (2) or (3), e.g., <code style='font-size: 0.875rem; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; margin-top: 0; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>session-hash = request</code> and <code style='font-size: 0.875rem; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>session-hash = require</code>
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