vici: Add support for NT Hash secrets

Fixes #1002.

src/libcharon/plugins/vici/vici_cred.c

@@ -339,6 +339,10 @@ CALLBACK(load_shared, vici_message_t*,
 	{
 		type = SHARED_EAP;
 	}
+	else if (strcaseeq(str, "ntlm"))
+	{
+		type = SHARED_NT_HASH;
+	}
 	else
 	{
 		return create_reply("invalid shared key type: %s", str);

src/swanctl/commands/load_creds.c

@@ -583,6 +583,7 @@ static bool load_secret(load_ctx_t *ctx, char *section)
 	char *types[] = {
 		"eap",
 		"xauth",
+		"ntlm",
 		"ike",
 		"private",
 		"rsa",
@@ -605,7 +606,8 @@ static bool load_secret(load_ctx_t *ctx, char *section)
 		fprintf(stderr, "ignoring unsupported secret '%s'\n", section);
 		return FALSE;
 	}
-	if (!streq(type, "eap") && !streq(type, "xauth") && !streq(type, "ike"))
+	if (!streq(type, "eap") && !streq(type, "xauth") && !streq(type, "ntlm") &&
+		!streq(type, "ike"))
 	{	/* skip non-shared secrets */
 		return TRUE;
 	}

src/swanctl/swanctl.opt

@@ -831,6 +831,28 @@ secrets.eap<suffix>.id<suffix> =
 	be specified, each having an _id_ prefix, if a secret is shared between
 	multiple users.
 
+secrets.ntlm<suffix> { # }
+	NTLM secret section for a specific secret.
+
+	NTLM secret section for a specific secret. Each NTLM secret is defined in
+	a unique section having the _ntlm_ prefix. NTLM secrets may only be used for
+	EAP-MSCHAPv2 authentication.
+
+secrets.ntlm<suffix>.secret =
+	Value of the NTLM secret.
+
+	Value of the NTLM secret, which is the NT Hash of the actual secret, that
+	is, MD4(UTF-16LE(secret)). The resulting 16-byte value may either be given
+	as a hex encoded string with a _0x_ prefix or as a Base64 encoded string
+	with a _0s_ prefix.
+
+secrets.ntlm<suffix>.id<suffix> =
+	Identity the NTLM secret belongs to.
+
+	Identity the NTLM secret belongs to. Multiple unique identities may
+	be specified, each having an _id_ prefix, if a secret is shared between
+	multiple users.
+
 secrets.ike<suffix> { # }
 	IKE preshared secret section for a specific secret.