SUNRPC: Remove RPCSEC_GSS_KRB5_ENCTYPES_DES

Make it impossible to enable support for the DES or DES3 Kerberos
encryption types in SunRPC. These enctypes were deprecated by RFCs
6649 and 8429 because they are known to be insecure.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

net/sunrpc/.kunitconfig

@@ -23,7 +23,6 @@ CONFIG_NFS_FS=y
 CONFIG_SUNRPC=y
 CONFIG_SUNRPC_GSS=y
 CONFIG_RPCSEC_GSS_KRB5=y
-CONFIG_RPCSEC_GSS_KRB5_ENCTYPES_DES=y
 CONFIG_RPCSEC_GSS_KRB5_ENCTYPES_AES_SHA1=y
 CONFIG_RPCSEC_GSS_KRB5_ENCTYPES_CAMELLIA=y
 CONFIG_RPCSEC_GSS_KRB5_ENCTYPES_AES_SHA2=y

net/sunrpc/Kconfig

@@ -34,38 +34,10 @@ config RPCSEC_GSS_KRB5
 
 	  If unsure, say Y.
 
-config RPCSEC_GSS_KRB5_SIMPLIFIED
-	bool
-	depends on RPCSEC_GSS_KRB5
-
 config RPCSEC_GSS_KRB5_CRYPTOSYSTEM
 	bool
 	depends on RPCSEC_GSS_KRB5
 
-config RPCSEC_GSS_KRB5_ENCTYPES_DES
-	bool "Enable Kerberos enctypes based on DES (deprecated)"
-	depends on RPCSEC_GSS_KRB5
-	depends on CRYPTO_CBC && CRYPTO_CTS && CRYPTO_ECB
-	depends on CRYPTO_HMAC && CRYPTO_MD5 && CRYPTO_SHA1
-	depends on CRYPTO_DES
-	default n
-	select RPCSEC_GSS_KRB5_SIMPLIFIED
-	help
-	  Choose Y to enable the use of deprecated Kerberos 5
-	  encryption types that utilize Data Encryption Standard
-	  (DES) based ciphers. These include des-cbc-md5,
-	  des-cbc-crc, and des-cbc-md4, which were deprecated by
-	  RFC 6649, and des3-cbc-sha1, which was deprecated by RFC
-	  8429.
-
-	  These encryption types are known to be insecure, therefore
-	  the default setting of this option is N. Support for these
-	  encryption types is available only for compatibility with
-	  legacy NFS client and server implementations.
-
-	  Removal of support is planned for a subsequent kernel
-	  release.
-
 config RPCSEC_GSS_KRB5_ENCTYPES_AES_SHA1
 	bool "Enable Kerberos enctypes based on AES and SHA-1"
 	depends on RPCSEC_GSS_KRB5