package home import ( "fmt" "net" "os" "path/filepath" "sync" "github.com/AdguardTeam/AdGuardHome/internal/aghalg" "github.com/AdguardTeam/AdGuardHome/internal/dhcpd" "github.com/AdguardTeam/AdGuardHome/internal/dnsforward" "github.com/AdguardTeam/AdGuardHome/internal/filtering" "github.com/AdguardTeam/AdGuardHome/internal/querylog" "github.com/AdguardTeam/AdGuardHome/internal/stats" "github.com/AdguardTeam/AdGuardHome/internal/version" "github.com/AdguardTeam/dnsproxy/fastip" "github.com/AdguardTeam/golibs/errors" "github.com/AdguardTeam/golibs/log" "github.com/AdguardTeam/golibs/timeutil" "github.com/google/renameio/maybe" yaml "gopkg.in/yaml.v2" ) const ( dataDir = "data" // data storage filterDir = "filters" // cache location for downloaded filters, it's under DataDir ) // logSettings type logSettings struct { LogCompress bool `yaml:"log_compress"` // Compress determines if the rotated log files should be compressed using gzip (default: false) LogLocalTime bool `yaml:"log_localtime"` // If the time used for formatting the timestamps in is the computer's local time (default: false [UTC]) LogMaxBackups int `yaml:"log_max_backups"` // Maximum number of old log files to retain (MaxAge may still cause them to get deleted) LogMaxSize int `yaml:"log_max_size"` // Maximum size in megabytes of the log file before it gets rotated (default 100 MB) LogMaxAge int `yaml:"log_max_age"` // MaxAge is the maximum number of days to retain old log files LogFile string `yaml:"log_file"` // Path to the log file. If empty, write to stdout. If "syslog", writes to syslog Verbose bool `yaml:"verbose"` // If true, verbose logging is enabled } // osConfig contains OS-related configuration. type osConfig struct { // Group is the name of the group which AdGuard Home must switch to on // startup. Empty string means no switching. Group string `yaml:"group"` // User is the name of the user which AdGuard Home must switch to on // startup. Empty string means no switching. User string `yaml:"user"` // RlimitNoFile is the maximum number of opened fd's per process. Zero // means use the default value. RlimitNoFile uint64 `yaml:"rlimit_nofile"` } // configuration is loaded from YAML // field ordering is important -- yaml fields will mirror ordering from here type configuration struct { // Raw file data to avoid re-reading of configuration file // It's reset after config is parsed fileData []byte BindHost net.IP `yaml:"bind_host"` // BindHost is the IP address of the HTTP server to bind to BindPort int `yaml:"bind_port"` // BindPort is the port the HTTP server BetaBindPort int `yaml:"beta_bind_port"` // BetaBindPort is the port for new client Users []User `yaml:"users"` // Users that can access HTTP server // AuthAttempts is the maximum number of failed login attempts a user // can do before being blocked. AuthAttempts uint `yaml:"auth_attempts"` // AuthBlockMin is the duration, in minutes, of the block of new login // attempts after AuthAttempts unsuccessful login attempts. AuthBlockMin uint `yaml:"block_auth_min"` ProxyURL string `yaml:"http_proxy"` // Proxy address for our HTTP client Language string `yaml:"language"` // two-letter ISO 639-1 language code DebugPProf bool `yaml:"debug_pprof"` // Enable pprof HTTP server on port 6060 // TTL for a web session (in hours) // An active session is automatically refreshed once a day. WebSessionTTLHours uint32 `yaml:"web_session_ttl"` DNS dnsConfig `yaml:"dns"` TLS tlsConfigSettings `yaml:"tls"` Filters []filter `yaml:"filters"` WhitelistFilters []filter `yaml:"whitelist_filters"` UserRules []string `yaml:"user_rules"` DHCP *dhcpd.ServerConfig `yaml:"dhcp"` // Clients contains the YAML representations of the persistent clients. // This field is only used for reading and writing persistent client data. // Keep this field sorted to ensure consistent ordering. Clients []*clientObject `yaml:"clients"` logSettings `yaml:",inline"` OSConfig *osConfig `yaml:"os"` sync.RWMutex `yaml:"-"` SchemaVersion int `yaml:"schema_version"` // keeping last so that users will be less tempted to change it -- used when upgrading between versions } // field ordering is important -- yaml fields will mirror ordering from here type dnsConfig struct { BindHosts []net.IP `yaml:"bind_hosts"` Port int `yaml:"port"` // time interval for statistics (in days) StatsInterval uint32 `yaml:"statistics_interval"` QueryLogEnabled bool `yaml:"querylog_enabled"` // if true, query log is enabled QueryLogFileEnabled bool `yaml:"querylog_file_enabled"` // if true, query log will be written to a file // QueryLogInterval is the interval for query log's files rotation. QueryLogInterval timeutil.Duration `yaml:"querylog_interval"` QueryLogMemSize uint32 `yaml:"querylog_size_memory"` // number of entries kept in memory before they are flushed to disk AnonymizeClientIP bool `yaml:"anonymize_client_ip"` // anonymize clients' IP addresses in logs and stats dnsforward.FilteringConfig `yaml:",inline"` FilteringEnabled bool `yaml:"filtering_enabled"` // whether or not use filter lists FiltersUpdateIntervalHours uint32 `yaml:"filters_update_interval"` // time period to update filters (in hours) DnsfilterConf filtering.Config `yaml:",inline"` // UpstreamTimeout is the timeout for querying upstream servers. UpstreamTimeout timeutil.Duration `yaml:"upstream_timeout"` // ResolveClients enables and disables resolving clients with RDNS. ResolveClients bool `yaml:"resolve_clients"` // PrivateNets is the set of IP networks for which the private reverse DNS // resolver should be used. PrivateNets []string `yaml:"private_networks"` // UsePrivateRDNS defines if the PTR requests for unknown addresses from // locally-served networks should be resolved via private PTR resolvers. UsePrivateRDNS bool `yaml:"use_private_ptr_resolvers"` // LocalPTRResolvers is the slice of addresses to be used as upstreams // for PTR queries for locally-served networks. LocalPTRResolvers []string `yaml:"local_ptr_upstreams"` } type tlsConfigSettings struct { Enabled bool `yaml:"enabled" json:"enabled"` // Enabled is the encryption (DoT/DoH/HTTPS) status ServerName string `yaml:"server_name" json:"server_name,omitempty"` // ServerName is the hostname of your HTTPS/TLS server ForceHTTPS bool `yaml:"force_https" json:"force_https"` // ForceHTTPS: if true, forces HTTP->HTTPS redirect PortHTTPS int `yaml:"port_https" json:"port_https,omitempty"` // HTTPS port. If 0, HTTPS will be disabled PortDNSOverTLS int `yaml:"port_dns_over_tls" json:"port_dns_over_tls,omitempty"` // DNS-over-TLS port. If 0, DoT will be disabled PortDNSOverQUIC int `yaml:"port_dns_over_quic" json:"port_dns_over_quic,omitempty"` // DNS-over-QUIC port. If 0, DoQ will be disabled // PortDNSCrypt is the port for DNSCrypt requests. If it's zero, // DNSCrypt is disabled. PortDNSCrypt int `yaml:"port_dnscrypt" json:"port_dnscrypt"` // DNSCryptConfigFile is the path to the DNSCrypt config file. Must be // set if PortDNSCrypt is not zero. // // See https://github.com/AdguardTeam/dnsproxy and // https://github.com/ameshkov/dnscrypt. DNSCryptConfigFile string `yaml:"dnscrypt_config_file" json:"dnscrypt_config_file"` // Allow DoH queries via unencrypted HTTP (e.g. for reverse proxying) AllowUnencryptedDoH bool `yaml:"allow_unencrypted_doh" json:"allow_unencrypted_doh"` dnsforward.TLSConfig `yaml:",inline" json:",inline"` } // config is the global configuration structure. // // TODO(a.garipov, e.burkov): This global is awful and must be removed. var config = &configuration{ BindPort: 3000, BetaBindPort: 0, BindHost: net.IP{0, 0, 0, 0}, AuthAttempts: 5, AuthBlockMin: 15, DNS: dnsConfig{ BindHosts: []net.IP{{0, 0, 0, 0}}, Port: defaultPortDNS, StatsInterval: 1, FilteringConfig: dnsforward.FilteringConfig{ ProtectionEnabled: true, // whether or not use any of filtering features BlockingMode: "default", // mode how to answer filtered requests BlockedResponseTTL: 10, // in seconds Ratelimit: 20, RefuseAny: true, AllServers: false, FastestTimeout: timeutil.Duration{ Duration: fastip.DefaultPingWaitTimeout, }, TrustedProxies: []string{"127.0.0.0/8", "::1/128"}, // set default maximum concurrent queries to 300 // we introduced a default limit due to this: // https://github.com/AdguardTeam/AdGuardHome/issues/2015#issuecomment-674041912 // was later increased to 300 due to https://github.com/AdguardTeam/AdGuardHome/issues/2257 MaxGoroutines: 300, }, FilteringEnabled: true, // whether or not use filter lists FiltersUpdateIntervalHours: 24, UpstreamTimeout: timeutil.Duration{Duration: dnsforward.DefaultTimeout}, ResolveClients: true, UsePrivateRDNS: true, }, TLS: tlsConfigSettings{ PortHTTPS: defaultPortHTTPS, PortDNSOverTLS: defaultPortTLS, // needs to be passed through to dnsproxy PortDNSOverQUIC: defaultPortQUIC, }, DHCP: &dhcpd.ServerConfig{ LocalDomainName: "lan", }, logSettings: logSettings{ LogCompress: false, LogLocalTime: false, LogMaxBackups: 0, LogMaxSize: 100, LogMaxAge: 3, }, OSConfig: &osConfig{}, SchemaVersion: currentSchemaVersion, } // initConfig initializes default configuration for the current OS&ARCH func initConfig() { config.WebSessionTTLHours = 30 * 24 config.DNS.QueryLogEnabled = true config.DNS.QueryLogFileEnabled = true config.DNS.QueryLogInterval = timeutil.Duration{Duration: 90 * timeutil.Day} config.DNS.QueryLogMemSize = 1000 config.DNS.CacheSize = 4 * 1024 * 1024 config.DNS.DnsfilterConf.SafeBrowsingCacheSize = 1 * 1024 * 1024 config.DNS.DnsfilterConf.SafeSearchCacheSize = 1 * 1024 * 1024 config.DNS.DnsfilterConf.ParentalCacheSize = 1 * 1024 * 1024 config.DNS.DnsfilterConf.CacheTime = 30 config.Filters = defaultFilters() config.DHCP.Conf4.LeaseDuration = dhcpd.DefaultDHCPLeaseTTL config.DHCP.Conf4.ICMPTimeout = dhcpd.DefaultDHCPTimeoutICMP config.DHCP.Conf6.LeaseDuration = dhcpd.DefaultDHCPLeaseTTL if ch := version.Channel(); ch == version.ChannelEdge || ch == version.ChannelDevelopment { config.BetaBindPort = 3001 } } // getConfigFilename returns path to the current config file func (c *configuration) getConfigFilename() string { configFile, err := filepath.EvalSymlinks(Context.configFilename) if err != nil { if !errors.Is(err, os.ErrNotExist) { log.Error("unexpected error while config file path evaluation: %s", err) } configFile = Context.configFilename } if !filepath.IsAbs(configFile) { configFile = filepath.Join(Context.workDir, configFile) } return configFile } // getLogSettings reads logging settings from the config file. // we do it in a separate method in order to configure logger before the actual configuration is parsed and applied. func getLogSettings() logSettings { l := logSettings{} yamlFile, err := readConfigFile() if err != nil { return l } err = yaml.Unmarshal(yamlFile, &l) if err != nil { log.Error("Couldn't get logging settings from the configuration: %s", err) } return l } // parseConfig loads configuration from the YAML file func parseConfig() (err error) { var fileData []byte fileData, err = readConfigFile() if err != nil { return err } config.fileData = nil err = yaml.Unmarshal(fileData, &config) if err != nil { return err } uc := aghalg.UniqChecker{} addPorts( uc, config.BindPort, config.BetaBindPort, config.DNS.Port, ) if config.TLS.Enabled { addPorts( uc, config.TLS.PortHTTPS, config.TLS.PortDNSOverTLS, config.TLS.PortDNSOverQUIC, config.TLS.PortDNSCrypt, ) } if err = uc.Validate(aghalg.IntIsBefore); err != nil { return fmt.Errorf("validating ports: %w", err) } if !checkFiltersUpdateIntervalHours(config.DNS.FiltersUpdateIntervalHours) { config.DNS.FiltersUpdateIntervalHours = 24 } if config.DNS.UpstreamTimeout.Duration == 0 { config.DNS.UpstreamTimeout = timeutil.Duration{Duration: dnsforward.DefaultTimeout} } return nil } // addPorts is a helper for ports validation. It skips zero ports. func addPorts(uc aghalg.UniqChecker, ports ...int) { for _, p := range ports { if p != 0 { uc.Add(p) } } } // readConfigFile reads configuration file contents. func readConfigFile() (fileData []byte, err error) { if len(config.fileData) > 0 { return config.fileData, nil } name := config.getConfigFilename() log.Debug("reading config file: %s", name) // Do not wrap the error because it's informative enough as is. return os.ReadFile(name) } // Saves configuration to the YAML file and also saves the user filter contents to a file func (c *configuration) write() error { c.Lock() defer c.Unlock() if Context.auth != nil { config.Users = Context.auth.GetUsers() } if Context.tls != nil { tlsConf := tlsConfigSettings{} Context.tls.WriteDiskConfig(&tlsConf) config.TLS = tlsConf } if Context.stats != nil { sdc := stats.DiskConfig{} Context.stats.WriteDiskConfig(&sdc) config.DNS.StatsInterval = sdc.Interval } if Context.queryLog != nil { dc := querylog.Config{} Context.queryLog.WriteDiskConfig(&dc) config.DNS.QueryLogEnabled = dc.Enabled config.DNS.QueryLogFileEnabled = dc.FileEnabled config.DNS.QueryLogInterval = timeutil.Duration{Duration: dc.RotationIvl} config.DNS.QueryLogMemSize = dc.MemSize config.DNS.AnonymizeClientIP = dc.AnonymizeClientIP } if Context.dnsFilter != nil { c := filtering.Config{} Context.dnsFilter.WriteDiskConfig(&c) config.DNS.DnsfilterConf = c } if s := Context.dnsServer; s != nil { c := dnsforward.FilteringConfig{} s.WriteDiskConfig(&c) dns := &config.DNS dns.FilteringConfig = c dns.LocalPTRResolvers, dns.ResolveClients, dns.UsePrivateRDNS = s.RDNSSettings() } if Context.dhcpServer != nil { c := &dhcpd.ServerConfig{} Context.dhcpServer.WriteDiskConfig(c) config.DHCP = c } config.Clients = Context.clients.forConfig() configFile := config.getConfigFilename() log.Debug("Writing YAML file: %s", configFile) yamlText, err := yaml.Marshal(&config) if err != nil { log.Error("Couldn't generate YAML file: %s", err) return err } err = maybe.WriteFile(configFile, yamlText, 0o644) if err != nil { log.Error("Couldn't save YAML config: %s", err) return err } return nil }