network: add network_set_passphrase

This lets other modules (like WSC) to set a plain text passphrase
as opposed to only allowing a PSK to be set. network_get_psk was
also updated to generate a PSK on-the-fly if required. Since WPA3
requires the raw passphrase to work, it makes sense to just store
the passphrase if we have it.

src/network.c

@@ -250,6 +250,18 @@ enum security network_get_security(const struct network *network)
 
 const uint8_t *network_get_psk(struct network *network)
 {
+	if (network->psk)
+		return network->psk;
+
+	if (!network->passphrase)
+		return NULL;
+
+	network->psk = l_malloc(32);
+
+	crypto_psk_from_passphrase(network->passphrase,
+					(unsigned char *)network->ssid,
+					strlen(network->ssid), network->psk);
+
 	return network->psk;
 }
 
@@ -258,6 +270,20 @@ const char *network_get_passphrase(const struct network *network)
 	return network->passphrase;
 }
 
+bool network_set_passphrase(struct network *network, const char *passphrase)
+{
+	if (network_get_security(network) != SECURITY_PSK)
+		return false;
+
+	if (!network_settings_load(network))
+		network->settings = l_settings_new();
+
+	network_reset_passphrase(network);
+	network->passphrase = l_strdup(passphrase);
+
+	return true;
+}
+
 struct l_queue *network_get_secrets(const struct network *network)
 {
 	return network->secrets;

src/network.h

@@ -41,6 +41,7 @@ const char *network_get_path(const struct network *network);
 enum security network_get_security(const struct network *network);
 const uint8_t *network_get_psk(struct network *network);
 const char *network_get_passphrase(const struct network *network);
+bool network_set_passphrase(struct network *network, const char *passphrase);
 struct l_queue *network_get_secrets(const struct network *network);
 int network_get_signal_strength(const struct network *network);
 struct l_settings *network_get_settings(const struct network *network);