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<a href="https://gitlab.com/dueno">Daiki Ueno</a>
<a href="https://gitlab.com/gnutls/gnutls/-/issues/912#note_1292194022">commented</a>:
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<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">The expected behavior is precisely documented at <a href="https://wiki.mozilla.org/CA/Additional_Trust_Changes#Distrust_After" rel="nofollow noreferrer noopener" target="_blank" style="margin-top: 0;">https://wiki.mozilla.org/CA/Additional_Trust_Changes#Distrust_After</a>:</p>
<blockquote dir="auto" style="font-size: inherit; color: #535158; padding-top: 0.5rem; padding-bottom: 0.5rem; padding-left: 1.5rem; box-shadow: inset 4px 0 0 0 #dcdcde; border-top-width: 0; border-bottom-width: 0; border-right-width: 0; margin: 0.5rem 0;" align="initial">
<p style="color: inherit; line-height: 1.5; margin: 0;">For some root certificates Mozilla has set 'Distrust for TLS After Date' or 'Distrust for S/MIME After Date'. For certificates chaining up to those root certificates, Mozilla does not trust end-entity certificates that have a Valid-From date later than the specified distrust-after date. Certificates with a Valid-From date earlier than the distrust-after date will continue to be trusted until the certificate's natural expiration or until the certificate is revoked.</p>
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<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">I guess that would translate to:</p>
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<li style="margin-top: 0; line-height: 1.6em; margin-left: 25px; padding-left: 3px;">obtain any CKA_NSS_SERVER_DISTRUST_AFTER attribute when retrieving issuer certificate (maybe store it in a private field of <code style='font-size: 0.875rem; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; margin-top: 0; font-family: var(--default-mono-font, "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;'>struct gnutls_x509_crt_int</code>)</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">compare issuer's distrust-after date with the one retrieved with <code style='font-size: 0.875rem; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; margin-top: 0; font-family: var(--default-mono-font, "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;'>gnutls_x509_crt_get_activation_time</code>
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