mirror of
https://github.com/netbirdio/netbird.git
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308 lines
8.9 KiB
Go
308 lines
8.9 KiB
Go
package internal
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import (
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"fmt"
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"net/url"
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"os"
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log "github.com/sirupsen/logrus"
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"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/status"
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"github.com/netbirdio/netbird/client/ssh"
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"github.com/netbirdio/netbird/iface"
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"github.com/netbirdio/netbird/util"
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)
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const (
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// ManagementLegacyPort is the port that was used before by the Management gRPC server.
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// It is used for backward compatibility now.
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// NB: hardcoded from github.com/netbirdio/netbird/management/cmd to avoid import
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ManagementLegacyPort = 33073
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// DefaultManagementURL points to the NetBird's cloud management endpoint
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DefaultManagementURL = "https://api.wiretrustee.com:443"
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// DefaultAdminURL points to NetBird's cloud management console
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DefaultAdminURL = "https://app.netbird.io:443"
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)
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var defaultInterfaceBlacklist = []string{iface.WgInterfaceDefault, "wt", "utun", "tun0", "zt", "ZeroTier", "wg", "ts",
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"Tailscale", "tailscale", "docker", "veth", "br-", "lo"}
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// ConfigInput carries configuration changes to the client
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type ConfigInput struct {
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ManagementURL string
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AdminURL string
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ConfigPath string
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PreSharedKey *string
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NATExternalIPs []string
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CustomDNSAddress []byte
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}
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// Config Configuration type
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type Config struct {
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// Wireguard private key of local peer
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PrivateKey string
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PreSharedKey string
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ManagementURL *url.URL
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AdminURL *url.URL
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WgIface string
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WgPort int
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IFaceBlackList []string
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DisableIPv6Discovery bool
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// SSHKey is a private SSH key in a PEM format
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SSHKey string
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// ExternalIP mappings, if different than the host interface IP
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//
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// External IP must not be behind a CGNAT and port-forwarding for incoming UDP packets from WgPort on ExternalIP
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// to WgPort on host interface IP must be present. This can take form of single port-forwarding rule, 1:1 DNAT
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// mapping ExternalIP to host interface IP, or a NAT DMZ to host interface IP.
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//
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// A single mapping will take the form of: external[/internal]
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// external (required): either the external IP address or "stun" to use STUN to determine the external IP address
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// internal (optional): either the internal/interface IP address or an interface name
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//
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// examples:
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// "12.34.56.78" => all interfaces IPs will be mapped to external IP of 12.34.56.78
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// "12.34.56.78/eth0" => IPv4 assigned to interface eth0 will be mapped to external IP of 12.34.56.78
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// "12.34.56.78/10.1.2.3" => interface IP 10.1.2.3 will be mapped to external IP of 12.34.56.78
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NATExternalIPs []string
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// CustomDNSAddress sets the DNS resolver listening address in format ip:port
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CustomDNSAddress string
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}
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// ReadConfig read config file and return with Config. If it is not exists create a new with default values
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func ReadConfig(configPath string) (*Config, error) {
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if configFileIsExists(configPath) {
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config := &Config{}
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if _, err := util.ReadJson(configPath, config); err != nil {
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return nil, err
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}
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return config, nil
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}
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cfg, err := createNewConfig(ConfigInput{ConfigPath: configPath})
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if err != nil {
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return nil, err
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}
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err = WriteOutConfig(configPath, cfg)
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return cfg, err
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}
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// UpdateConfig update existing configuration according to input configuration and return with the configuration
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func UpdateConfig(input ConfigInput) (*Config, error) {
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if !configFileIsExists(input.ConfigPath) {
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return nil, status.Errorf(codes.NotFound, "config file doesn't exist")
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}
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return update(input)
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}
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// UpdateOrCreateConfig reads existing config or generates a new one
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func UpdateOrCreateConfig(input ConfigInput) (*Config, error) {
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if !configFileIsExists(input.ConfigPath) {
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log.Infof("generating new config %s", input.ConfigPath)
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cfg, err := createNewConfig(input)
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if err != nil {
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return nil, err
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}
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err = WriteOutConfig(input.ConfigPath, cfg)
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return cfg, err
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}
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if isPreSharedKeyHidden(input.PreSharedKey) {
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input.PreSharedKey = nil
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}
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return update(input)
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}
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// CreateInMemoryConfig generate a new config but do not write out it to the store
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func CreateInMemoryConfig(input ConfigInput) (*Config, error) {
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return createNewConfig(input)
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}
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// WriteOutConfig write put the prepared config to the given path
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func WriteOutConfig(path string, config *Config) error {
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return util.WriteJson(path, config)
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}
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// createNewConfig creates a new config generating a new Wireguard key and saving to file
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func createNewConfig(input ConfigInput) (*Config, error) {
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wgKey := generateKey()
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pem, err := ssh.GeneratePrivateKey(ssh.ED25519)
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if err != nil {
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return nil, err
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}
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config := &Config{
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SSHKey: string(pem),
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PrivateKey: wgKey,
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WgIface: iface.WgInterfaceDefault,
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WgPort: iface.DefaultWgPort,
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IFaceBlackList: []string{},
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DisableIPv6Discovery: false,
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NATExternalIPs: input.NATExternalIPs,
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CustomDNSAddress: string(input.CustomDNSAddress),
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}
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defaultManagementURL, err := parseURL("Management URL", DefaultManagementURL)
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if err != nil {
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return nil, err
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}
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config.ManagementURL = defaultManagementURL
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if input.ManagementURL != "" {
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URL, err := parseURL("Management URL", input.ManagementURL)
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if err != nil {
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return nil, err
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}
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config.ManagementURL = URL
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}
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if input.PreSharedKey != nil {
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config.PreSharedKey = *input.PreSharedKey
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}
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defaultAdminURL, err := parseURL("Admin URL", DefaultAdminURL)
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if err != nil {
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return nil, err
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}
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config.AdminURL = defaultAdminURL
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if input.AdminURL != "" {
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newURL, err := parseURL("Admin Panel URL", input.AdminURL)
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if err != nil {
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return nil, err
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}
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config.AdminURL = newURL
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}
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config.IFaceBlackList = defaultInterfaceBlacklist
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return config, nil
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}
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func update(input ConfigInput) (*Config, error) {
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config := &Config{}
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if _, err := util.ReadJson(input.ConfigPath, config); err != nil {
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return nil, err
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}
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refresh := false
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if input.ManagementURL != "" && config.ManagementURL.String() != input.ManagementURL {
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log.Infof("new Management URL provided, updated to %s (old value %s)",
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input.ManagementURL, config.ManagementURL)
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newURL, err := parseURL("Management URL", input.ManagementURL)
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if err != nil {
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return nil, err
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}
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config.ManagementURL = newURL
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refresh = true
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}
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if input.AdminURL != "" && (config.AdminURL == nil || config.AdminURL.String() != input.AdminURL) {
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log.Infof("new Admin Panel URL provided, updated to %s (old value %s)",
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input.AdminURL, config.AdminURL)
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newURL, err := parseURL("Admin Panel URL", input.AdminURL)
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if err != nil {
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return nil, err
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}
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config.AdminURL = newURL
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refresh = true
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}
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if input.PreSharedKey != nil && config.PreSharedKey != *input.PreSharedKey {
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if *input.PreSharedKey != "" {
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log.Infof("new pre-shared key provides, updated to %s (old value %s)",
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*input.PreSharedKey, config.PreSharedKey)
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config.PreSharedKey = *input.PreSharedKey
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refresh = true
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}
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}
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if config.SSHKey == "" {
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pem, err := ssh.GeneratePrivateKey(ssh.ED25519)
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if err != nil {
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return nil, err
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}
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config.SSHKey = string(pem)
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refresh = true
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}
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if config.WgPort == 0 {
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config.WgPort = iface.DefaultWgPort
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refresh = true
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}
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if input.NATExternalIPs != nil && len(config.NATExternalIPs) != len(input.NATExternalIPs) {
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config.NATExternalIPs = input.NATExternalIPs
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refresh = true
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}
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if input.CustomDNSAddress != nil {
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config.CustomDNSAddress = string(input.CustomDNSAddress)
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refresh = true
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}
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if refresh {
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// since we have new management URL, we need to update config file
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if err := util.WriteJson(input.ConfigPath, config); err != nil {
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return nil, err
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}
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}
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return config, nil
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}
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// parseURL parses and validates a service URL
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func parseURL(serviceName, serviceURL string) (*url.URL, error) {
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parsedMgmtURL, err := url.ParseRequestURI(serviceURL)
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if err != nil {
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log.Errorf("failed parsing %s URL %s: [%s]", serviceName, serviceURL, err.Error())
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return nil, err
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}
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if parsedMgmtURL.Scheme != "https" && parsedMgmtURL.Scheme != "http" {
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return nil, fmt.Errorf(
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"invalid %s URL provided %s. Supported format [http|https]://[host]:[port]",
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serviceName, serviceURL)
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}
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if parsedMgmtURL.Port() == "" {
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switch parsedMgmtURL.Scheme {
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case "https":
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parsedMgmtURL.Host = parsedMgmtURL.Host + ":443"
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case "http":
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parsedMgmtURL.Host = parsedMgmtURL.Host + ":80"
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default:
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log.Infof("unable to determine a default port for schema %s in URL %s", parsedMgmtURL.Scheme, serviceURL)
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}
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}
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return parsedMgmtURL, err
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}
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// generateKey generates a new Wireguard private key
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func generateKey() string {
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key, err := wgtypes.GeneratePrivateKey()
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if err != nil {
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panic(err)
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}
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return key.String()
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}
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// don't overwrite pre-shared key if we receive asterisks from UI
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func isPreSharedKeyHidden(preSharedKey *string) bool {
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if preSharedKey != nil && *preSharedKey == "**********" {
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return true
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}
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return false
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}
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func configFileIsExists(path string) bool {
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_, err := os.Stat(path)
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return !os.IsNotExist(err)
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}
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