[PATCH net v5 3/3] esp, ah: modernize the crypto algorithm selections

[Eric Biggers <ebiggers@kernel.org>]

From: Eric Biggers <ebiggers@google.com>

The crypto algorithms selected by the ESP and AH kconfig options are
out-of-date with the guidance of RFC 8221, which lists the legacy
algorithms MD5 and DES as "MUST NOT" be implemented, and some more
modern algorithms like AES-GCM and HMAC-SHA256 as "MUST" be implemented.
But the options select the legacy algorithms, not the modern ones.

Therefore, modify these options to select the MUST algorithms --
and *only* the MUST algorithms.

Also improve the help text.

Note that other algorithms may still be explicitly enabled in the
kconfig, and the choice of which to actually use is still controlled by
userspace.  This change only modifies the list of algorithms for which
kernel support is guaranteed to be present.

Suggested-by: Herbert Xu <herbert@gondor.apana.org.au>
Suggested-by: Steffen Klassert <steffen.klassert@secunet.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Corentin Labbe <clabbe@baylibre.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 net/ipv4/Kconfig | 18 ++++++++++++++++--
 net/ipv6/Kconfig | 18 ++++++++++++++++--
 net/xfrm/Kconfig | 15 +++++++++------
 3 files changed, 41 insertions(+), 10 deletions(-)

diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
index c0653de6d00e..e64e59b536d3 100644
--- a/net/ipv4/Kconfig
+++ b/net/ipv4/Kconfig
@@ -342,7 +342,14 @@ config INET_AH
 	tristate "IP: AH transformation"
 	select XFRM_AH
 	help
-	  Support for IPsec AH.
+	  Support for IPsec AH (Authentication Header).
+
+	  AH can be used with various authentication algorithms.  Besides
+	  enabling AH support itself, this option enables the generic
+	  implementations of the algorithms that RFC 8221 lists as MUST be
+	  implemented.  If you need any other algorithms, you'll need to enable
+	  them in the crypto API.  You should also enable accelerated
+	  implementations of any needed algorithms when available.
 
 	  If unsure, say Y.
 
@@ -350,7 +357,14 @@ config INET_ESP
 	tristate "IP: ESP transformation"
 	select XFRM_ESP
 	help
-	  Support for IPsec ESP.
+	  Support for IPsec ESP (Encapsulating Security Payload).
+
+	  ESP can be used with various encryption and authentication algorithms.
+	  Besides enabling ESP support itself, this option enables the generic
+	  implementations of the algorithms that RFC 8221 lists as MUST be
+	  implemented.  If you need any other algorithms, you'll need to enable
+	  them in the crypto API.  You should also enable accelerated
+	  implementations of any needed algorithms when available.
 
 	  If unsure, say Y.
 
diff --git a/net/ipv6/Kconfig b/net/ipv6/Kconfig
index 05f99d30b8be..f4f19e89af5e 100644
--- a/net/ipv6/Kconfig
+++ b/net/ipv6/Kconfig
@@ -51,7 +51,14 @@ config INET6_AH
 	tristate "IPv6: AH transformation"
 	select XFRM_AH
 	help
-	  Support for IPsec AH.
+	  Support for IPsec AH (Authentication Header).
+
+	  AH can be used with various authentication algorithms.  Besides
+	  enabling AH support itself, this option enables the generic
+	  implementations of the algorithms that RFC 8221 lists as MUST be
+	  implemented.  If you need any other algorithms, you'll need to enable
+	  them in the crypto API.  You should also enable accelerated
+	  implementations of any needed algorithms when available.
 
 	  If unsure, say Y.
 
@@ -59,7 +66,14 @@ config INET6_ESP
 	tristate "IPv6: ESP transformation"
 	select XFRM_ESP
 	help
-	  Support for IPsec ESP.
+	  Support for IPsec ESP (Encapsulating Security Payload).
+
+	  ESP can be used with various encryption and authentication algorithms.
+	  Besides enabling ESP support itself, this option enables the generic
+	  implementations of the algorithms that RFC 8221 lists as MUST be
+	  implemented.  If you need any other algorithms, you'll need to enable
+	  them in the crypto API.  You should also enable accelerated
+	  implementations of any needed algorithms when available.
 
 	  If unsure, say Y.
 
diff --git a/net/xfrm/Kconfig b/net/xfrm/Kconfig
index bfb45ee56e5f..5b9a5ab48111 100644
--- a/net/xfrm/Kconfig
+++ b/net/xfrm/Kconfig
@@ -67,26 +67,29 @@ config XFRM_STATISTICS
 
 	  If unsure, say N.
 
+# This option selects XFRM_ALGO along with the AH authentication algorithms that
+# RFC 8221 lists as MUST be implemented.
 config XFRM_AH
 	tristate
 	select XFRM_ALGO
 	select CRYPTO
 	select CRYPTO_HMAC
-	select CRYPTO_MD5
-	select CRYPTO_SHA1
+	select CRYPTO_SHA256
 
+# This option selects XFRM_ALGO along with the ESP encryption and authentication
+# algorithms that RFC 8221 lists as MUST be implemented.
 config XFRM_ESP
 	tristate
 	select XFRM_ALGO
 	select CRYPTO
+	select CRYPTO_AES
 	select CRYPTO_AUTHENC
-	select CRYPTO_HMAC
-	select CRYPTO_MD5
 	select CRYPTO_CBC
-	select CRYPTO_SHA1
-	select CRYPTO_DES
 	select CRYPTO_ECHAINIV
+	select CRYPTO_GCM
+	select CRYPTO_HMAC
 	select CRYPTO_SEQIV
+	select CRYPTO_SHA256
 
 config XFRM_IPCOMP
 	tristate
-- 
2.27.0.290.gba653c62da-goog