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diff --git a/chromium/net/docs/certificate_lifetimes.md b/chromium/net/docs/certificate_lifetimes.md new file mode 100644 index 00000000000..ee413ef9157 --- /dev/null +++ b/chromium/net/docs/certificate_lifetimes.md @@ -0,0 +1,78 @@ +# Certificate Lifetimes + +As part of our ongoing commitment to ensuring users’ security, Google is +reducing the maximum allowed lifetimes of TLS certificates. + +## Upcoming Changes + +Beginning with Chrome 85, TLS server certificates issued on or after +2020-09-01 00:00:00 UTC will be required to have a validity period of 398 days +or less. This will only apply to TLS server certificates from CAs that are +trusted in a default installation of Google Chrome, commonly known as +"publicly trusted CAs", and will not apply to locally-operated CAs that have +been manually configured. + +Certificates that do not comply with this requirement will not work, and may +cause webpages to fail to load or to render incorrectly. + +If a certificate that does not comply with this requirement is issued by a CA +trusted in a default installation of Google Chrome, this will be treated as a +failure to comply with the security policies necessary to being a trusted CA, +and may result in the removal of trust of that CA’s certificates. + +## Technical Details + +* A certificate will be impacted by this restriction if either the notBefore + of the certificate is on or after 2020-09-01 00:00:00 UTC, or if the first + precertificate logged by the CA to a Certificate Transparency Log that is + qualified at time of issuance is on or after this date. +* The validity period of a certificate is defined within RFC 5280, Section + 4.1.2.5, as "the period of time from notBefore through notAfter, inclusive." +* 398 days is measured with a day being equal to 86,400 seconds. Any time + greater than this indicates an additional day of validity. +* To avoid the risk of misissuance, such as due to leap seconds or + CA-configured randomization, CAs SHOULD issue such server certificates with + validity periods of 397 days or less. + +## Frequently Asked Questions + +* Does this apply to locally-operated CAs, such as those used within + enterprises that use enterprise-configured configured CAs? + * No. This only applies to the set of CAs that are trusted by default by + Google Chrome, and not CAs that are operated by an enterprise and that + have no certification paths to CAs that are trusted by default. +* Is there an enterprise policy to disable this enforcement? + * No. These changes are transparent and do not offer an enterprise control + to override, as they only apply to so-called "publicly trusted" CAs. + Enterprises that wish to have certificates with validity periods longer + than 398 days may do so by using a locally-operated CA that does not have + any certification paths up to a publicly trusted CA. +* Does this mean I have to replace my existing certificates? + * No. This requirement only applies to new certificate issuance on or after + 2020-09-01 00:00:00 UTC. Existing certificates whose validity period + exceeds 398 days will continue to work, while new certificates must comply + with these new requirements, such as when they are renewed or replaced. +* Will this make certificates more expensive? + * As with past changes to the maximum certificate lifetimes, many CAs have + committed to providing additional certificates, as needed by the shortened + maximum lifetime, at no additional cost. +* What will happen if a certificate is issued that does not meet these + requirements? + * Google Chrome will reject such certificates as having too long a validity + period, consistent with existing validity-period based enforcement. + Additionally, such certificates will be treated as a critical security + failure by the CA, and may result in further action taken on the CA that + may affect how current or future certificates from that CA function. + Chromium-based browsers will have this enforcement enabled by default, and + will need to modify the source to disable this. +* What are other browsers doing? + * Apple previously announced this change for versions of iOS, iPadOS, macOS, + tvOS, and watchOS, as documented at + https://support.apple.com/en-us/HT211025, which will apply to all + applications, and not just those of Safari. This certificate lifetime + requirement is fully interoperable with Apple’s requirements. + + Microsoft, Mozilla, Opera, and 360 have previously indicated their support + for these requirements, although have not yet made announcements at the + time of this post (2020-06-22). Other browsers, including those browsers + based on Chromium, may provide additional guidance or clarification. |