open-vault/changelog/16494.txt
Alexander Scheel cf7105929f
Allow old certs to be cross-signed (#16494)
* Allow old certs to be cross-signed

In Vault 1.11, we introduced cross-signing support, but the earlier SKID
field change in Vault 1.10 causes problems: notably, certs created on
older versions of Vault (<=1.9) or outside of Vault (with a different
SKID method) cannot be cross-signed and validated in OpenSSL.

In particular, OpenSSL appears to be unique in requiring a SKID/AKID
match for chain building. If AKID and SKID are present on an otherwise
valid client/parent cert pair and the values are different, OpenSSL will
not build a valid path over those two, whereas most other chain
validation implementations will.

Regardless, to have proper cross-signing support, we really aught to
support copying an SKID. This adds such support to the sign-intermediate
endpoint. Support for the /issue endpoint is not added, as cross-signing
leaf certs isn't generally useful and can accept random SKIDs.

Resolves: #16461

Signed-off-by: Alexander Scheel <alex.scheel@hashicorp.com>

* Add changelog

Signed-off-by: Alexander Scheel <alex.scheel@hashicorp.com>

* Address review feedback, fix tests

Also adds a known-answer test using LE R3 CA's SKID.

Signed-off-by: Alexander Scheel <alex.scheel@hashicorp.com>

* Address review feedback regarding separators

Signed-off-by: Alexander Scheel <alex.scheel@hashicorp.com>
2022-08-03 06:34:21 -07:00

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```release-note:improvement
secret/pki: Allow specifying SKID for cross-signed issuance from older Vault versions.
```