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authorChuck Lever <chuck.lever@oracle.com>2023-01-15 20:21:52 +0300
committerChuck Lever <chuck.lever@oracle.com>2023-02-20 17:20:41 +0300
commitdfe9a123451a6e73306c988eab3dab12df001677 (patch)
treeb418302e09260c70f47e53b1f3b2f7f6089e2066 /net/sunrpc/auth_gss/gss_krb5_seqnum.c
parent17781b2ce41a8915163d7cdada021f809ccd49f0 (diff)
downloadlinux-dfe9a123451a6e73306c988eab3dab12df001677.tar.xz
SUNRPC: Enable rpcsec_gss_krb5.ko to be built without CRYPTO_DES
Because the DES block cipher has been deprecated by Internet standard, highly secure configurations might require that DES support be blacklisted or not installed. NFS Kerberos should still be able to work correctly with only the AES-based enctypes in that situation. Also note that MIT Kerberos has begun a deprecation process for DES encryption types. Their README for 1.19.3 states: > Beginning with the krb5-1.19 release, a warning will be issued > if initial credentials are acquired using the des3-cbc-sha1 > encryption type. In future releases, this encryption type will > be disabled by default and eventually removed. > > Beginning with the krb5-1.18 release, single-DES encryption > types have been removed. Aside from the CONFIG option name change, there are two important policy changes: 1. The 'insecure enctype' group is now disabled by default. Distributors have to take action to enable support for deprecated enctypes. Implementation of these enctypes will be removed in a future kernel release. 2. des3-cbc-sha1 is now considered part of the 'insecure enctype' group, having been deprecated by RFC 8429, and is thus disabled by default After this patch is applied, SunRPC support can be built with Kerberos 5 support but without CRYPTO_DES enabled in the kernel. And, when these enctypes are disabled, the Linux kernel's SunRPC RPCSEC GSS implementation fully complies with BCP 179 / RFC 6649 and BCP 218 / RFC 8429. Tested-by: Scott Mayhew <smayhew@redhat.com> Reviewed-by: Simo Sorce <simo@redhat.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Diffstat (limited to 'net/sunrpc/auth_gss/gss_krb5_seqnum.c')
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