Support IP-SAN certificates#83
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acme-client gained support for IP-SAN certificates at 2.0.29.
Certificate#ip_sans returns all iPAddress entries in subjectAltName.
acmesmith order/autorenew/add-san commands can now handle IP addresses in subject alternative name.
sorah
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Mar 20, 2026
hanazuki
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Apr 6, 2026
RFC 8738 requires IPv6 identifiers to follow the textual form defined in RFC 5952 §4 (lowercase hex, compressed). The raw input string was previously sent as-is to the CA. This causes renewal to fail when a certificate was previously issued with an IPv6 SAN: OpenSSL renders IPv6 addresses with uppercase hex digits, so when acmesmith reads the existing certificate's SANs to build the renewal order, the uppercase form is passed through unchanged and rejected by the CA as a malformed identifier. Fixup: sorah#83
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Limitation:
acmesmith ordermust have a DNS identifier as the first SAN. acmesmith uses the first SAN as CN when generating a CSR, but CN cannot be an IP address.