Add deprecation warnings for IPsec algorithms deprecated in RFC 8221.

All of these algorithms are either explicitly marked MUST NOT, or they
are implicitly MUST NOTs by virtue of not being included in IETF's
list of protocols at all despite having assignments from IANA.

Specifically, this adds warnings for the following ciphers:
- des-cbc
- blowfish-cbc
- cast128-cbc
- des-deriv
- des-32iv
- camellia-cbc

Warnings for the following authentication algorithms are also added:
- hmac-md5
- keyed-md5
- keyed-sha1
- hmac-ripemd160

Reviewed by:	cem, gnn
MFC after:	3 days
Sponsored by:	Chelsio Communications
Differential Revision:	https://reviews.freebsd.org/D20340

2 files changed, 45 insertions, 0 deletions

diff --git a/sys/netipsec/xform_ah.c b/sys/netipsec/xform_ah.c
index a6cc773b0e0c0..bd6ee7d22a19a 100644
--- a/sys/netipsec/xform_ah.c
+++ b/sys/netipsec/xform_ah.c
@@ -108,6 +108,8 @@ SYSCTL_VNET_PCPUSTAT(_net_inet_ah, IPSECCTL_STATS, stats, struct ahstat,
 #endif
 
 static unsigned char ipseczeroes[256];	/* larger than an ip6 extension hdr */
+static struct timeval md5warn, ripewarn, kpdkmd5warn, kpdksha1warn;
+static struct timeval warninterval = { .tv_sec = 1, .tv_usec = 0 };
 
 static int ah_input_cb(struct cryptop*);
 static int ah_output_cb(struct cryptop*);
@@ -184,6 +186,26 @@ ah_init0(struct secasvar *sav, struct xformsw *xsp, struct cryptoini *cria)
 			__func__, sav->alg_auth));
 		return EINVAL;
 	}
+
+	switch (sav->alg_auth) {
+	case SADB_AALG_MD5HMAC:
+		if (ratecheck(&md5warn, &warninterval))
+			gone_in(13, "MD5-HMAC authenticator for IPsec");
+		break;
+	case SADB_X_AALG_RIPEMD160HMAC:
+		if (ratecheck(&ripewarn, &warninterval))
+			gone_in(13, "RIPEMD160-HMAC authenticator for IPsec");
+		break;
+	case SADB_X_AALG_MD5:
+		if (ratecheck(&kpdkmd5warn, &warninterval))
+			gone_in(13, "Keyed-MD5 authenticator for IPsec");
+		break;
+	case SADB_X_AALG_SHA:
+		if (ratecheck(&kpdksha1warn, &warninterval))
+			gone_in(13, "Keyed-SHA1 authenticator for IPsec");
+		break;
+	}
+
 	/*
 	 * Verify the replay state block allocation is consistent with
 	 * the protocol type.  We check here so we can make assumptions
diff --git a/sys/netipsec/xform_esp.c b/sys/netipsec/xform_esp.c
index 77cba8345f895..dc5a10bacc637 100644
--- a/sys/netipsec/xform_esp.c
+++ b/sys/netipsec/xform_esp.c
@@ -94,6 +94,9 @@ SYSCTL_VNET_PCPUSTAT(_net_inet_esp, IPSECCTL_STATS, stats,
     struct espstat, espstat,
     "ESP statistics (struct espstat, netipsec/esp_var.h");
 
+static struct timeval deswarn, blfwarn, castwarn, camelliawarn;
+static struct timeval warninterval = { .tv_sec = 1, .tv_usec = 0 };
+
 static int esp_input_cb(struct cryptop *op);
 static int esp_output_cb(struct cryptop *crp);
 
@@ -156,6 +159,26 @@ esp_init(struct secasvar *sav, struct xformsw *xsp)
 			__func__));
 		return EINVAL;
 	}
+
+	switch (sav->alg_enc) {
+	case SADB_EALG_DESCBC:
+		if (ratecheck(&deswarn, &warninterval))
+			gone_in(13, "DES cipher for IPsec");
+		break;
+	case SADB_X_EALG_BLOWFISHCBC:
+		if (ratecheck(&blfwarn, &warninterval))
+			gone_in(13, "Blowfish cipher for IPsec");
+		break;
+	case SADB_X_EALG_CAST128CBC:
+		if (ratecheck(&castwarn, &warninterval))
+			gone_in(13, "CAST cipher for IPsec");
+		break;
+	case SADB_X_EALG_CAMELLIACBC:
+		if (ratecheck(&camelliawarn, &warninterval))
+			gone_in(13, "Camellia cipher for IPsec");
+		break;
+	}
+
 	/* subtract off the salt, RFC4106, 8.1 and RFC3686, 5.1 */
 	keylen = _KEYLEN(sav->key_enc) - SAV_ISCTRORGCM(sav) * 4;
 	if (txform->minkey > keylen || keylen > txform->maxkey) {