[PATCH v4 1/5] network: expose RSN capabilities on BSS

[Aleksman4o <aleksman4o@gmail.com>]

From: Aleks Man <aleksman4o@gmail.com>

Network.Type intentionally groups all personal networks as "psk".
Consumers therefore cannot distinguish PSK, SAE, and transition BSSes
even though scan results retain the RSN IE.

Add an optional RSN dictionary to BasicServiceSet with the advertised
key management suites and pairwise and group ciphers. Use the same field
and value names as wpa_supplicant's BSS.RSN property so consumers can
share parsing logic.

Parse bss->rsne directly so legacy WPA capabilities are not exposed as
RSN.
---
 src/network.c | 110 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)

diff --git a/src/network.c b/src/network.c
index a5a2375a..aa9e1281 100644
--- a/src/network.c
+++ b/src/network.c
@@ -2198,10 +2198,120 @@ static bool network_bss_property_get_address(struct l_dbus *dbus,
 	return true;
 }
 
+struct network_bss_suite_name {
+	uint32_t suite;
+	const char *name;
+};
+
+static const struct network_bss_suite_name network_bss_akm_names[] = {
+	{ IE_RSN_AKM_SUITE_PSK, "wpa-psk" },
+	{ IE_RSN_AKM_SUITE_FT_USING_PSK, "wpa-ft-psk" },
+	{ IE_RSN_AKM_SUITE_PSK_SHA256, "wpa-psk-sha256" },
+	{ IE_RSN_AKM_SUITE_8021X, "wpa-eap" },
+	{ IE_RSN_AKM_SUITE_FT_OVER_8021X, "wpa-ft-eap" },
+	{ IE_RSN_AKM_SUITE_8021X_SHA256, "wpa-eap-sha256" },
+	{ IE_RSN_AKM_SUITE_8021X_SUITE_B_SHA256, "wpa-eap-suite-b" },
+	{ IE_RSN_AKM_SUITE_8021X_SUITE_B_SHA384, "wpa-eap-suite-b-192" },
+	{ IE_RSN_AKM_SUITE_FT_OVER_8021X_SHA384, "wpa-ft-eap-sha384" },
+	{ IE_RSN_AKM_SUITE_FILS_SHA256, "wpa-fils-sha256" },
+	{ IE_RSN_AKM_SUITE_FILS_SHA384, "wpa-fils-sha384" },
+	{ IE_RSN_AKM_SUITE_FT_OVER_FILS_SHA256, "wpa-ft-fils-sha256" },
+	{ IE_RSN_AKM_SUITE_FT_OVER_FILS_SHA384, "wpa-ft-fils-sha384" },
+	{ IE_RSN_AKM_SUITE_SAE_SHA256, "sae" },
+	{ IE_RSN_AKM_SUITE_FT_OVER_SAE_SHA256, "ft-sae" },
+	{ IE_RSN_AKM_SUITE_OWE, "owe" },
+};
+
+static const struct network_bss_suite_name network_bss_pairwise_names[] = {
+	{ IE_RSN_CIPHER_SUITE_TKIP, "tkip" },
+	{ IE_RSN_CIPHER_SUITE_CCMP, "ccmp" },
+	{ IE_RSN_CIPHER_SUITE_GCMP, "gcmp" },
+	{ IE_RSN_CIPHER_SUITE_CCMP_256, "ccmp-256" },
+	{ IE_RSN_CIPHER_SUITE_GCMP_256, "gcmp-256" },
+};
+
+static const struct network_bss_suite_name network_bss_group_names[] = {
+	{ IE_RSN_CIPHER_SUITE_WEP40, "wep40" },
+	{ IE_RSN_CIPHER_SUITE_WEP104, "wep104" },
+	{ IE_RSN_CIPHER_SUITE_TKIP, "tkip" },
+	{ IE_RSN_CIPHER_SUITE_CCMP, "ccmp" },
+	{ IE_RSN_CIPHER_SUITE_GCMP, "gcmp" },
+	{ IE_RSN_CIPHER_SUITE_CCMP_256, "ccmp-256" },
+	{ IE_RSN_CIPHER_SUITE_GCMP_256, "gcmp-256" },
+};
+
+static void network_bss_append_suite_names(
+					struct l_dbus_message_builder *builder,
+					const char *name, uint32_t suites,
+					const struct network_bss_suite_name *names,
+					size_t names_len)
+{
+	size_t i;
+
+	l_dbus_message_builder_enter_dict(builder, "sv");
+	l_dbus_message_builder_append_basic(builder, 's', name);
+	l_dbus_message_builder_enter_variant(builder, "as");
+	l_dbus_message_builder_enter_array(builder, "s");
+
+	for (i = 0; i < names_len; i++)
+		if (suites & names[i].suite)
+			l_dbus_message_builder_append_basic(builder, 's',
+								names[i].name);
+
+	l_dbus_message_builder_leave_array(builder);
+	l_dbus_message_builder_leave_variant(builder);
+	l_dbus_message_builder_leave_dict(builder);
+}
+
+static const char *network_bss_group_cipher_name(
+					enum ie_rsn_cipher_suite cipher)
+{
+	size_t i;
+
+	for (i = 0; i < L_ARRAY_SIZE(network_bss_group_names); i++)
+		if (network_bss_group_names[i].suite == cipher)
+			return network_bss_group_names[i].name;
+
+	return "";
+}
+
+static bool network_bss_property_get_rsn(struct l_dbus *dbus,
+					struct l_dbus_message *message,
+					struct l_dbus_message_builder *builder,
+					void *user_data)
+{
+	struct scan_bss *bss = user_data;
+	struct ie_rsn_info info;
+	const char *group;
+
+	if (!bss->rsne || ie_parse_rsne_from_data(bss->rsne, bss->rsne[1] + 2,
+								&info) < 0)
+		return false;
+
+	l_dbus_message_builder_enter_array(builder, "{sv}");
+
+	network_bss_append_suite_names(builder, "KeyMgmt", info.akm_suites,
+					network_bss_akm_names,
+					L_ARRAY_SIZE(network_bss_akm_names));
+	network_bss_append_suite_names(builder, "Pairwise",
+					info.pairwise_ciphers,
+					network_bss_pairwise_names,
+					L_ARRAY_SIZE(network_bss_pairwise_names));
+
+	group = network_bss_group_cipher_name(info.group_cipher);
+	dbus_append_dict_basic(builder, "Group", 's', group);
+
+	l_dbus_message_builder_leave_array(builder);
+
+	return true;
+}
+
 static void setup_bss_interface(struct l_dbus_interface *interface)
 {
 	l_dbus_interface_property(interface, "Address", 0, "s",
 					network_bss_property_get_address, NULL);
+	l_dbus_interface_property(interface, "RSN", 0, "a{sv}",
+					network_bss_property_get_rsn, NULL);
 }
 
 static int network_init(void)
-- 
2.55.0