transport

package
Version: v0.0.0-...-d88c8b5 Latest Latest
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Published: Feb 9, 2021 License: Apache-2.0 Imports: 19 Imported by: 0

Documentation

Index

Constants

View Source
const (
	// ImpersonateUserHeader is used to impersonate a particular user during an API server request
	ImpersonateUserHeader = "Impersonate-User"

	// ImpersonateGroupHeader is used to impersonate a particular group during an API server request.
	// It can be repeated multiplied times for multiple groups.
	ImpersonateGroupHeader = "Impersonate-Group"

	// ImpersonateUserExtraHeaderPrefix is a prefix for a header used to impersonate an entry in the
	// extra map[string][]string for user.Info.  The key for the `extra` map is suffix.
	// The same key can be repeated multiple times to have multiple elements in the slice under a single key.
	// For instance:
	// Impersonate-Extra-Foo: one
	// Impersonate-Extra-Foo: two
	// results in extra["Foo"] = []string{"one", "two"}
	ImpersonateUserExtraHeaderPrefix = "Impersonate-Extra-"
)

These correspond to the headers used in pkg/apis/authentication. We don't want the package dependency, but you must not change the values.

Variables

View Source
var CertCallbackRefreshDuration = 5 * time.Minute

CertCallbackRefreshDuration is exposed so that integration tests can crank up the reload speed.

Functions

func DebugWrappers

func DebugWrappers(rt http.RoundTripper) http.RoundTripper

DebugWrappers wraps a round tripper and logs based on the current log level.

func HTTPWrappersForConfig

func HTTPWrappersForConfig(config *Config, rt http.RoundTripper) (http.RoundTripper, error)

HTTPWrappersForConfig wraps a round tripper with any relevant layered behavior from the config. Exposed to allow more clients that need HTTP-like behavior but then must hijack the underlying connection (like WebSocket or HTTP2 clients). Pure HTTP clients should use the RoundTripper returned from New.

func New

func New(config *Config) (http.RoundTripper, error)

New returns an http.RoundTripper that will provide the authentication or transport level security defined by the provided Config.

func NewAuthProxyRoundTripper

func NewAuthProxyRoundTripper(username string, groups []string, extra map[string][]string, rt http.RoundTripper) http.RoundTripper

NewAuthProxyRoundTripper provides a roundtripper which will add auth proxy fields to requests for authentication terminating proxy cases assuming you pull the user from the context: username is the user.Info.GetName() of the user groups is the user.Info.GetGroups() of the user extra is the user.Info.GetExtra() of the user extra can contain any additional information that the authenticator thought was interesting, for example authorization scopes. In order to faithfully round-trip through an impersonation flow, these keys MUST be lowercase.

func NewBasicAuthRoundTripper

func NewBasicAuthRoundTripper(username, password string, rt http.RoundTripper) http.RoundTripper

NewBasicAuthRoundTripper will apply a BASIC auth authorization header to a request unless it has already been set.

func NewBearerAuthRoundTripper

func NewBearerAuthRoundTripper(bearer string, rt http.RoundTripper) http.RoundTripper

NewBearerAuthRoundTripper adds the provided bearer token to a request unless the authorization header has already been set.

func NewBearerAuthWithRefreshRoundTripper

func NewBearerAuthWithRefreshRoundTripper(bearer string, tokenFile string, rt http.RoundTripper) (http.RoundTripper, error)

NewBearerAuthRoundTripper adds the provided bearer token to a request unless the authorization header has already been set. If tokenFile is non-empty, it is periodically read, and the last successfully read content is used as the bearer token. If tokenFile is non-empty and bearer is empty, the tokenFile is read immediately to populate the initial bearer token.

func NewCachedFileTokenSource

func NewCachedFileTokenSource(path string) oauth2.TokenSource

NewCachedFileTokenSource returns a oauth2.TokenSource reads a token from a file at a specified path and periodically reloads it.

func NewCachedTokenSource

func NewCachedTokenSource(ts oauth2.TokenSource) oauth2.TokenSource

NewCachedTokenSource returns a oauth2.TokenSource reads a token from a designed TokenSource. The ts would provide the source of token.

func NewImpersonatingRoundTripper

func NewImpersonatingRoundTripper(impersonate ImpersonationConfig, delegate http.RoundTripper) http.RoundTripper

NewImpersonatingRoundTripper will add an Act-As header to a request unless it has already been set.

func NewUserAgentRoundTripper

func NewUserAgentRoundTripper(agent string, rt http.RoundTripper) http.RoundTripper

func SetAuthProxyHeaders

func SetAuthProxyHeaders(req *http.Request, username string, groups []string, extra map[string][]string)

SetAuthProxyHeaders stomps the auth proxy header fields. It mutates its argument.

func TLSConfigFor

func TLSConfigFor(c *Config) (*tls.Config, error)

TLSConfigFor returns a tls.Config that will provide the transport level security defined by the provided Config. Will return nil if no transport level security is requested.

func TokenSourceWrapTransport

func TokenSourceWrapTransport(ts oauth2.TokenSource) func(http.RoundTripper) http.RoundTripper

TokenSourceWrapTransport returns a WrapTransport that injects bearer tokens authentication from an oauth2.TokenSource.

Types

type Config

type Config struct {
	// UserAgent is an optional field that specifies the caller of this
	// request.
	UserAgent string

	// The base TLS configuration for this transport.
	TLS TLSConfig

	// Username and password for basic authentication
	Username string
	Password string

	// Bearer token for authentication
	BearerToken string

	// Path to a file containing a BearerToken.
	// If set, the contents are periodically read.
	// The last successfully read value takes precedence over BearerToken.
	BearerTokenFile string

	// Impersonate is the config that this Config will impersonate using
	Impersonate ImpersonationConfig

	// DisableCompression bypasses automatic GZip compression requests to the
	// server.
	DisableCompression bool

	// Transport may be used for custom HTTP behavior. This attribute may
	// not be specified with the TLS client certificate options. Use
	// WrapTransport for most client level operations.
	Transport http.RoundTripper

	// WrapTransport will be invoked for custom HTTP behavior after the
	// underlying transport is initialized (either the transport created
	// from TLSClientConfig, Transport, or http.DefaultTransport). The
	// config may layer other RoundTrippers on top of the returned
	// RoundTripper.
	//
	// A future release will change this field to an array. Use config.Wrap()
	// instead of setting this value directly.
	WrapTransport WrapperFunc

	// Dial specifies the dial function for creating unencrypted TCP connections.
	Dial func(ctx context.Context, network, address string) (net.Conn, error)
}

Config holds various options for establishing a transport.

func (*Config) HasBasicAuth

func (c *Config) HasBasicAuth() bool

HasBasicAuth returns whether the configuration has basic authentication or not.

func (*Config) HasCA

func (c *Config) HasCA() bool

HasCA returns whether the configuration has a certificate authority or not.

func (*Config) HasCertAuth

func (c *Config) HasCertAuth() bool

HasCertAuth returns whether the configuration has certificate authentication or not.

func (*Config) HasCertCallback

func (c *Config) HasCertCallback() bool

HasCertCallbacks returns whether the configuration has certificate callback or not.

func (*Config) HasTokenAuth

func (c *Config) HasTokenAuth() bool

HasTokenAuth returns whether the configuration has token authentication or not.

func (*Config) Wrap

func (c *Config) Wrap(fn WrapperFunc)

Wrap adds a transport middleware function that will give the caller an opportunity to wrap the underlying http.RoundTripper prior to the first API call being made. The provided function is invoked after any existing transport wrappers are invoked.

type ImpersonationConfig

type ImpersonationConfig struct {
	// UserName matches user.Info.GetName()
	UserName string
	// Groups matches user.Info.GetGroups()
	Groups []string
	// Extra matches user.Info.GetExtra()
	Extra map[string][]string
}

ImpersonationConfig has all the available impersonation options

type TLSConfig

type TLSConfig struct {
	CAFile         string // Path of the PEM-encoded server trusted root certificates.
	CertFile       string // Path of the PEM-encoded client certificate.
	KeyFile        string // Path of the PEM-encoded client key.
	ReloadTLSFiles bool   // Set to indicate that the original config provided files, and that they should be reloaded

	Insecure   bool   // Server should be accessed without verifying the certificate. For testing only.
	ServerName string // Override for the server name passed to the server for SNI and used to verify certificates.

	CAData   []byte // Bytes of the PEM-encoded server trusted root certificates. Supercedes CAFile.
	CertData []byte // Bytes of the PEM-encoded client certificate. Supercedes CertFile.
	KeyData  []byte // Bytes of the PEM-encoded client key. Supercedes KeyFile.

	// NextProtos is a list of supported application level protocols, in order of preference.
	// Used to populate tls.Config.NextProtos.
	// To indicate to the server http/1.1 is preferred over http/2, set to ["http/1.1", "h2"] (though the server is free to ignore that preference).
	// To use only http/1.1, set to ["http/1.1"].
	NextProtos []string

	GetCert func() (*tls.Certificate, error) // Callback that returns a TLS client certificate. CertData, CertFile, KeyData and KeyFile supercede this field.
}

TLSConfig holds the information needed to set up a TLS transport.

type WrapperFunc

type WrapperFunc func(rt http.RoundTripper) http.RoundTripper

WrapperFunc wraps an http.RoundTripper when a new transport is created for a client, allowing per connection behavior to be injected.

func ContextCanceller

func ContextCanceller(ctx context.Context, err error) WrapperFunc

ContextCanceller prevents new requests after the provided context is finished. err is returned when the context is closed, allowing the caller to provide a context appropriate error.

func Wrappers

func Wrappers(fns ...WrapperFunc) WrapperFunc

Wrappers accepts any number of wrappers and returns a wrapper function that is the equivalent of calling each of them in order. Nil values are ignored, which makes this function convenient for incrementally wrapping a function.

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