package types import ( "crypto/tls" "crypto/x509" "encoding" "errors" "fmt" "io/ioutil" "os" "strconv" "strings" "github.com/abronan/valkeyrie/store" "github.com/containous/flaeg" "github.com/containous/mux" "github.com/containous/traefik/log" traefiktls "github.com/containous/traefik/tls" "github.com/mitchellh/hashstructure" "github.com/ryanuber/go-glob" ) // Backend holds backend configuration. type Backend struct { Servers map[string]Server `json:"servers,omitempty"` CircuitBreaker *CircuitBreaker `json:"circuitBreaker,omitempty"` LoadBalancer *LoadBalancer `json:"loadBalancer,omitempty"` MaxConn *MaxConn `json:"maxConn,omitempty"` HealthCheck *HealthCheck `json:"healthCheck,omitempty"` Buffering *Buffering `json:"buffering,omitempty"` } // MaxConn holds maximum connection configuration type MaxConn struct { Amount int64 `json:"amount,omitempty"` ExtractorFunc string `json:"extractorFunc,omitempty"` } // LoadBalancer holds load balancing configuration. type LoadBalancer struct { Method string `json:"method,omitempty"` Sticky bool `json:"sticky,omitempty"` // Deprecated: use Stickiness instead Stickiness *Stickiness `json:"stickiness,omitempty"` } // Stickiness holds sticky session configuration. type Stickiness struct { CookieName string `json:"cookieName,omitempty"` } // CircuitBreaker holds circuit breaker configuration. type CircuitBreaker struct { Expression string `json:"expression,omitempty"` } // Buffering holds request/response buffering configuration/ type Buffering struct { MaxRequestBodyBytes int64 `json:"maxRequestBodyBytes,omitempty"` MemRequestBodyBytes int64 `json:"memRequestBodyBytes,omitempty"` MaxResponseBodyBytes int64 `json:"maxResponseBodyBytes,omitempty"` MemResponseBodyBytes int64 `json:"memResponseBodyBytes,omitempty"` RetryExpression string `json:"retryExpression,omitempty"` } // WhiteList contains white list configuration. type WhiteList struct { SourceRange []string `json:"sourceRange,omitempty"` UseXForwardedFor bool `json:"useXForwardedFor,omitempty" export:"true"` } // HealthCheck holds HealthCheck configuration type HealthCheck struct { Scheme string `json:"scheme,omitempty"` Path string `json:"path,omitempty"` Port int `json:"port,omitempty"` Interval string `json:"interval,omitempty"` Hostname string `json:"hostname,omitempty"` Headers map[string]string `json:"headers,omitempty"` } // Server holds server configuration. type Server struct { URL string `json:"url,omitempty"` Weight int `json:"weight"` } // Route holds route configuration. type Route struct { Rule string `json:"rule,omitempty"` } // ServerRoute holds ServerRoute configuration. type ServerRoute struct { Route *mux.Route StripPrefixes []string StripPrefixesRegex []string AddPrefix string ReplacePath string ReplacePathRegex string } // ErrorPage holds custom error page configuration type ErrorPage struct { Status []string `json:"status,omitempty"` Backend string `json:"backend,omitempty"` Query string `json:"query,omitempty"` } // Rate holds a rate limiting configuration for a specific time period type Rate struct { Period flaeg.Duration `json:"period,omitempty"` Average int64 `json:"average,omitempty"` Burst int64 `json:"burst,omitempty"` } // RateLimit holds a rate limiting configuration for a given frontend type RateLimit struct { RateSet map[string]*Rate `json:"rateset,omitempty"` ExtractorFunc string `json:"extractorFunc,omitempty"` } // Headers holds the custom header configuration type Headers struct { CustomRequestHeaders map[string]string `json:"customRequestHeaders,omitempty"` CustomResponseHeaders map[string]string `json:"customResponseHeaders,omitempty"` AllowedHosts []string `json:"allowedHosts,omitempty"` HostsProxyHeaders []string `json:"hostsProxyHeaders,omitempty"` SSLRedirect bool `json:"sslRedirect,omitempty"` SSLTemporaryRedirect bool `json:"sslTemporaryRedirect,omitempty"` SSLHost string `json:"sslHost,omitempty"` SSLProxyHeaders map[string]string `json:"sslProxyHeaders,omitempty"` SSLForceHost bool `json:"sslForceHost,omitempty"` STSSeconds int64 `json:"stsSeconds,omitempty"` STSIncludeSubdomains bool `json:"stsIncludeSubdomains,omitempty"` STSPreload bool `json:"stsPreload,omitempty"` ForceSTSHeader bool `json:"forceSTSHeader,omitempty"` FrameDeny bool `json:"frameDeny,omitempty"` CustomFrameOptionsValue string `json:"customFrameOptionsValue,omitempty"` ContentTypeNosniff bool `json:"contentTypeNosniff,omitempty"` BrowserXSSFilter bool `json:"browserXssFilter,omitempty"` CustomBrowserXSSValue string `json:"customBrowserXSSValue,omitempty"` ContentSecurityPolicy string `json:"contentSecurityPolicy,omitempty"` PublicKey string `json:"publicKey,omitempty"` ReferrerPolicy string `json:"referrerPolicy,omitempty"` IsDevelopment bool `json:"isDevelopment,omitempty"` } // HasCustomHeadersDefined checks to see if any of the custom header elements have been set func (h *Headers) HasCustomHeadersDefined() bool { return h != nil && (len(h.CustomResponseHeaders) != 0 || len(h.CustomRequestHeaders) != 0) } // HasSecureHeadersDefined checks to see if any of the secure header elements have been set func (h *Headers) HasSecureHeadersDefined() bool { return h != nil && (len(h.AllowedHosts) != 0 || len(h.HostsProxyHeaders) != 0 || h.SSLRedirect || h.SSLTemporaryRedirect || h.SSLForceHost || h.SSLHost != "" || len(h.SSLProxyHeaders) != 0 || h.STSSeconds != 0 || h.STSIncludeSubdomains || h.STSPreload || h.ForceSTSHeader || h.FrameDeny || h.CustomFrameOptionsValue != "" || h.ContentTypeNosniff || h.BrowserXSSFilter || h.CustomBrowserXSSValue != "" || h.ContentSecurityPolicy != "" || h.PublicKey != "" || h.ReferrerPolicy != "" || h.IsDevelopment) } // Frontend holds frontend configuration. type Frontend struct { EntryPoints []string `json:"entryPoints,omitempty" hash:"ignore"` Backend string `json:"backend,omitempty"` Routes map[string]Route `json:"routes,omitempty" hash:"ignore"` PassHostHeader bool `json:"passHostHeader,omitempty"` PassTLSCert bool `json:"passTLSCert,omitempty"` Priority int `json:"priority"` BasicAuth []string `json:"basicAuth"` // Deprecated WhitelistSourceRange []string `json:"whitelistSourceRange,omitempty"` // Deprecated WhiteList *WhiteList `json:"whiteList,omitempty"` Headers *Headers `json:"headers,omitempty"` Errors map[string]*ErrorPage `json:"errors,omitempty"` RateLimit *RateLimit `json:"ratelimit,omitempty"` Redirect *Redirect `json:"redirect,omitempty"` Auth *Auth `json:"auth,omitempty"` } // Hash returns the hash value of a Frontend struct. func (f *Frontend) Hash() (string, error) { hash, err := hashstructure.Hash(f, nil) if err != nil { return "", err } return strconv.FormatUint(hash, 10), nil } // Redirect configures a redirection of an entry point to another, or to an URL type Redirect struct { EntryPoint string `json:"entryPoint,omitempty"` Regex string `json:"regex,omitempty"` Replacement string `json:"replacement,omitempty"` Permanent bool `json:"permanent,omitempty"` } // LoadBalancerMethod holds the method of load balancing to use. type LoadBalancerMethod uint8 const ( // Wrr (default) = Weighted Round Robin Wrr LoadBalancerMethod = iota // Drr = Dynamic Round Robin Drr ) var loadBalancerMethodNames = []string{ "Wrr", "Drr", } // NewLoadBalancerMethod create a new LoadBalancerMethod from a given LoadBalancer. func NewLoadBalancerMethod(loadBalancer *LoadBalancer) (LoadBalancerMethod, error) { if loadBalancer == nil { return Wrr, errors.New("no load-balancer defined, fallback to 'wrr' method") } if len(loadBalancer.Method) == 0 { return Wrr, errors.New("no load-balancing method defined, fallback to 'wrr' method") } for i, name := range loadBalancerMethodNames { if strings.EqualFold(name, loadBalancer.Method) { return LoadBalancerMethod(i), nil } } return Wrr, fmt.Errorf("invalid load-balancing method %q, fallback to 'wrr' method", loadBalancer.Method) } // Configurations is for currentConfigurations Map type Configurations map[string]*Configuration // Configuration of a provider. type Configuration struct { Backends map[string]*Backend `json:"backends,omitempty"` Frontends map[string]*Frontend `json:"frontends,omitempty"` TLS []*traefiktls.Configuration `json:"-"` } // ConfigMessage hold configuration information exchanged between parts of traefik. type ConfigMessage struct { ProviderName string Configuration *Configuration } // Constraint hold a parsed constraint expression type Constraint struct { Key string `export:"true"` // MustMatch is true if operator is "==" or false if operator is "!=" MustMatch bool `export:"true"` // TODO: support regex Regex string `export:"true"` } // NewConstraint receive a string and return a *Constraint, after checking syntax and parsing the constraint expression func NewConstraint(exp string) (*Constraint, error) { sep := "" constraint := &Constraint{} if strings.Contains(exp, "==") { sep = "==" constraint.MustMatch = true } else if strings.Contains(exp, "!=") { sep = "!=" constraint.MustMatch = false } else { return nil, errors.New("constraint expression missing valid operator: '==' or '!='") } kv := strings.SplitN(exp, sep, 2) if len(kv) == 2 { // At the moment, it only supports tags if kv[0] != "tag" { return nil, errors.New("constraint must be tag-based. Syntax: tag==us-*") } constraint.Key = kv[0] constraint.Regex = kv[1] return constraint, nil } return nil, fmt.Errorf("incorrect constraint expression: %s", exp) } func (c *Constraint) String() string { if c.MustMatch { return c.Key + "==" + c.Regex } return c.Key + "!=" + c.Regex } var _ encoding.TextUnmarshaler = (*Constraint)(nil) // UnmarshalText define how unmarshal in TOML parsing func (c *Constraint) UnmarshalText(text []byte) error { constraint, err := NewConstraint(string(text)) if err != nil { return err } c.Key = constraint.Key c.MustMatch = constraint.MustMatch c.Regex = constraint.Regex return nil } var _ encoding.TextMarshaler = (*Constraint)(nil) // MarshalText encodes the receiver into UTF-8-encoded text and returns the result. func (c *Constraint) MarshalText() (text []byte, err error) { return []byte(c.String()), nil } // MatchConstraintWithAtLeastOneTag tests a constraint for one single service func (c *Constraint) MatchConstraintWithAtLeastOneTag(tags []string) bool { for _, tag := range tags { if glob.Glob(c.Regex, tag) { return true } } return false } // Set []*Constraint func (cs *Constraints) Set(str string) error { exps := strings.Split(str, ",") if len(exps) == 0 { return fmt.Errorf("bad Constraint format: %s", str) } for _, exp := range exps { constraint, err := NewConstraint(exp) if err != nil { return err } *cs = append(*cs, constraint) } return nil } // Constraints holds a Constraint parser type Constraints []*Constraint // Get []*Constraint func (cs *Constraints) Get() interface{} { return []*Constraint(*cs) } // String returns []*Constraint in string func (cs *Constraints) String() string { return fmt.Sprintf("%+v", *cs) } // SetValue sets []*Constraint into the parser func (cs *Constraints) SetValue(val interface{}) { *cs = val.(Constraints) } // Type exports the Constraints type as a string func (cs *Constraints) Type() string { return "constraint" } // Store holds KV store cluster config type Store struct { store.Store // like this "prefix" (without the /) Prefix string `export:"true"` } // Cluster holds cluster config type Cluster struct { Node string `description:"Node name" export:"true"` Store *Store `export:"true"` } // Auth holds authentication configuration (BASIC, DIGEST, users) type Auth struct { Basic *Basic `json:"basic,omitempty" export:"true"` Digest *Digest `json:"digest,omitempty" export:"true"` Forward *Forward `json:"forward,omitempty" export:"true"` HeaderField string `json:"headerField,omitempty" export:"true"` } // Users authentication users type Users []string // Basic HTTP basic authentication type Basic struct { Users `json:"users,omitempty" mapstructure:","` UsersFile string `json:"usersFile,omitempty"` RemoveHeader bool `json:"removeHeader,omitempty"` } // Digest HTTP authentication type Digest struct { Users `json:"users,omitempty" mapstructure:","` UsersFile string `json:"usersFile,omitempty"` RemoveHeader bool `json:"removeHeader,omitempty"` } // Forward authentication type Forward struct { Address string `description:"Authentication server address" json:"address,omitempty"` TLS *ClientTLS `description:"Enable TLS support" json:"tls,omitempty" export:"true"` TrustForwardHeader bool `description:"Trust X-Forwarded-* headers" json:"trustForwardHeader,omitempty" export:"true"` AuthResponseHeaders []string `description:"Headers to be forwarded from auth response" json:"authResponseHeaders,omitempty"` } // CanonicalDomain returns a lower case domain with trim space func CanonicalDomain(domain string) string { return strings.ToLower(strings.TrimSpace(domain)) } // Statistics provides options for monitoring request and response stats type Statistics struct { RecentErrors int `description:"Number of recent errors logged" export:"true"` } // Metrics provides options to expose and send Traefik metrics to different third party monitoring systems type Metrics struct { Prometheus *Prometheus `description:"Prometheus metrics exporter type" export:"true"` Datadog *Datadog `description:"DataDog metrics exporter type" export:"true"` StatsD *Statsd `description:"StatsD metrics exporter type" export:"true"` InfluxDB *InfluxDB `description:"InfluxDB metrics exporter type"` } // Prometheus can contain specific configuration used by the Prometheus Metrics exporter type Prometheus struct { Buckets Buckets `description:"Buckets for latency metrics" export:"true"` EntryPoint string `description:"EntryPoint" export:"true"` } // Datadog contains address and metrics pushing interval configuration type Datadog struct { Address string `description:"DataDog's address"` PushInterval string `description:"DataDog push interval" export:"true"` } // Statsd contains address and metrics pushing interval configuration type Statsd struct { Address string `description:"StatsD address"` PushInterval string `description:"StatsD push interval" export:"true"` } // InfluxDB contains address and metrics pushing interval configuration type InfluxDB struct { Address string `description:"InfluxDB address"` Protocol string `description:"InfluxDB address protocol (udp or http)"` PushInterval string `description:"InfluxDB push interval" export:"true"` Database string `description:"InfluxDB database used when protocol is http" export:"true"` RetentionPolicy string `description:"InfluxDB retention policy used when protocol is http" export:"true"` } // Buckets holds Prometheus Buckets type Buckets []float64 // Set adds strings elem into the the parser // it splits str on "," and ";" and apply ParseFloat to string func (b *Buckets) Set(str string) error { fargs := func(c rune) bool { return c == ',' || c == ';' } // get function slice := strings.FieldsFunc(str, fargs) for _, bucket := range slice { bu, err := strconv.ParseFloat(bucket, 64) if err != nil { return err } *b = append(*b, bu) } return nil } // Get []float64 func (b *Buckets) Get() interface{} { return *b } // String return slice in a string func (b *Buckets) String() string { return fmt.Sprintf("%v", *b) } // SetValue sets []float64 into the parser func (b *Buckets) SetValue(val interface{}) { *b = val.(Buckets) } // ClientTLS holds TLS specific configurations as client // CA, Cert and Key can be either path or file contents type ClientTLS struct { CA string `description:"TLS CA" json:"ca,omitempty"` CAOptional bool `description:"TLS CA.Optional" json:"caOptional,omitempty"` Cert string `description:"TLS cert" json:"cert,omitempty"` Key string `description:"TLS key" json:"key,omitempty"` InsecureSkipVerify bool `description:"TLS insecure skip verify" json:"insecureSkipVerify,omitempty"` } // CreateTLSConfig creates a TLS config from ClientTLS structures func (clientTLS *ClientTLS) CreateTLSConfig() (*tls.Config, error) { var err error if clientTLS == nil { log.Warnf("clientTLS is nil") return nil, nil } caPool := x509.NewCertPool() clientAuth := tls.NoClientCert if clientTLS.CA != "" { var ca []byte if _, errCA := os.Stat(clientTLS.CA); errCA == nil { ca, err = ioutil.ReadFile(clientTLS.CA) if err != nil { return nil, fmt.Errorf("failed to read CA. %s", err) } } else { ca = []byte(clientTLS.CA) } caPool.AppendCertsFromPEM(ca) if clientTLS.CAOptional { clientAuth = tls.VerifyClientCertIfGiven } else { clientAuth = tls.RequireAndVerifyClientCert } } cert := tls.Certificate{} _, errKeyIsFile := os.Stat(clientTLS.Key) if !clientTLS.InsecureSkipVerify && (len(clientTLS.Cert) == 0 || len(clientTLS.Key) == 0) { return nil, fmt.Errorf("TLS Certificate or Key file must be set when TLS configuration is created") } if len(clientTLS.Cert) > 0 && len(clientTLS.Key) > 0 { if _, errCertIsFile := os.Stat(clientTLS.Cert); errCertIsFile == nil { if errKeyIsFile == nil { cert, err = tls.LoadX509KeyPair(clientTLS.Cert, clientTLS.Key) if err != nil { return nil, fmt.Errorf("failed to load TLS keypair: %v", err) } } else { return nil, fmt.Errorf("tls cert is a file, but tls key is not") } } else { if errKeyIsFile != nil { cert, err = tls.X509KeyPair([]byte(clientTLS.Cert), []byte(clientTLS.Key)) if err != nil { return nil, fmt.Errorf("failed to load TLS keypair: %v", err) } } else { return nil, fmt.Errorf("TLS key is a file, but tls cert is not") } } } TLSConfig := &tls.Config{ Certificates: []tls.Certificate{cert}, RootCAs: caPool, InsecureSkipVerify: clientTLS.InsecureSkipVerify, ClientAuth: clientAuth, } return TLSConfig, nil } // HTTPCodeRanges holds HTTP code ranges type HTTPCodeRanges [][2]int // NewHTTPCodeRanges creates HTTPCodeRanges from a given []string. // Break out the http status code ranges into a low int and high int // for ease of use at runtime func NewHTTPCodeRanges(strBlocks []string) (HTTPCodeRanges, error) { var blocks HTTPCodeRanges for _, block := range strBlocks { codes := strings.Split(block, "-") // if only a single HTTP code was configured, assume the best and create the correct configuration on the user's behalf if len(codes) == 1 { codes = append(codes, codes[0]) } lowCode, err := strconv.Atoi(codes[0]) if err != nil { return nil, err } highCode, err := strconv.Atoi(codes[1]) if err != nil { return nil, err } blocks = append(blocks, [2]int{lowCode, highCode}) } return blocks, nil } // Contains tests whether the passed status code is within // one of its HTTP code ranges. func (h HTTPCodeRanges) Contains(statusCode int) bool { for _, block := range h { if statusCode >= block[0] && statusCode <= block[1] { return true } } return false }