strongcomms

package module
v0.0.0-...-216fc9a Latest Latest
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 Go to latest Published: Oct 26, 2020 License: BSD-3-Clause Imports: 18 Imported by: 0

README

Strongcomms

Security-minded communications for Go. Primary goal is to exclusively use HTTPS/TLS for everything, providing both security and privacy for common network needs (DNS, NTP, etc).

The functionality includes:

  • DNS-over-HTTPS (DOH) client (RFC8484), biased to Cloudflare, Quad9, and Google servers, and utilizing an internal cache.

  • An HTTPS client, using DOH for DNS lookups, that includes various methods to verify the server/server certificate (system roots, custom roots, pins, etc). Specific support is provided for Cloudfront and Cloudflare, a la CDN domain-fronting style obfuscation of traffic destination. The goal is to attempt to prevent TLS SNI leakage (until Golang natively supports ESNI).

  • A method to bootstrap receiving current date/time over HTTPS (instead of via NTP), for IoT/RTC-challenged devices. The process is more complicated than it sounds, because you need a reasonably accurate concept of time in order to correctly validate the HTTPS certificate chain and get to the point where you can trust the date/time provided to you.

The code is generally concurrency-safe for use once the client is configured and allocated, but not for live config changes to Client object while running concurrent to lookup/request operations.

Documentation

Index

Constants

View Source 
const (
	TagDOH         = "DOH"
	TagClient      = "Client"
	TagNetworkTest = "NetTest"
	TagNetworkTime = "NetTime"
)

Variables

View Source 
var (
	DefaultTimeoutNetworkTest  = 5 * time.Second
	DefaultTimeoutDOH          = 30 * time.Second
	DefaultTimeoutHTTPSTotal   = 15 * time.Minute
	DefaultTimeoutHTTPSSetup   = 15 * time.Second
	DefaultMinimumDOHCacheTime = 5 * time.Minute
	DefaultCacheSize           = 32

	DefaultTLSMinVersion    = uint16(tls.VersionTLS12)
	DefaultCurvePreferences = []tls.CurveID{
		tls.CurveP521,
		tls.CurveP384,
		tls.CurveP256,
	}
	DefaultCipherSuites = []uint16{
		tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
		tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
		tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
		tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
		tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
		tls.TLS_RSA_WITH_AES_256_GCM_SHA384,
		tls.TLS_RSA_WITH_AES_128_GCM_SHA256,
	}
)
View Source 
var (
	// Aggregate collection of certs used by DOH providers:
	CertsDOH = []byte(`
#DigiCert Global Root CA
-----BEGIN CERTIFICATE-----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CAUw7C29C79Fv1C5qfPrmAESrciIxpg0X40KPMbp1ZWVbd4=
-----END CERTIFICATE-----
#GlobalSign Root CA
-----BEGIN CERTIFICATE-----
MIIDdTCCAl2gAwIBAgILBAAAAAABFUtaw5QwDQYJKoZIhvcNAQEFBQAwVzELMAkG
A1UEBhMCQkUxGTAXBgNVBAoTEEdsb2JhbFNpZ24gbnYtc2ExEDAOBgNVBAsTB1Jv
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HMUfpIBvFSDJ3gyICh3WZlXi/EjJKSZp4A==
-----END CERTIFICATE-----
#VeriSign Class 3 Public Primary Certification Authority - G5
-----BEGIN CERTIFICATE-----
MIIE0zCCA7ugAwIBAgIQGNrRniZ96LtKIVjNzGs7SjANBgkqhkiG9w0BAQUFADCB
yjELMAkGA1UEBhMCVVMxFzAVBgNVBAoTDlZlcmlTaWduLCBJbmMuMR8wHQYDVQQL
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hnacRHr2lVz2XTIIM6RUthg/aFzyQkqFOFSDX9HoLPKsEdao7WNq
-----END CERTIFICATE-----
# Google Internet Authority G3
-----BEGIN CERTIFICATE-----
MIIEXDCCA0SgAwIBAgINAeOpMBz8cgY4P5pTHTANBgkqhkiG9w0BAQsFADBMMSAw
HgYDVQQLExdHbG9iYWxTaWduIFJvb3QgQ0EgLSBSMjETMBEGA1UEChMKR2xvYmFs
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c7o835DLAFshEWfC7TIe3g==
-----END CERTIFICATE-----
# Google trust services
-----BEGIN CERTIFICATE-----
MIIESjCCAzKgAwIBAgINAeO0mqGNiqmBJWlQuDANBgkqhkiG9w0BAQsFADBMMSAw
HgYDVQQLExdHbG9iYWxTaWduIFJvb3QgQ0EgLSBSMjETMBEGA1UEChMKR2xvYmFs
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A4IBDwAwggEKAoIBAQDQGM9F1IvN05zkQO9+tN1pIRvJzzyOTHW5DzEZhD2ePCnv
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USpxu6x6td0V7SvJCCosirSmIatj/9dSSVDQibet8q/7UK4v4ZUN80atnZz1yg==
-----END CERTIFICATE-----
	`)

	// Taken from https://www.amazontrust.com/repository/
	CertsAmazon = []byte(`
# CN=Amazon Root CA 1,O=Amazon,C=US
-----BEGIN CERTIFICATE-----
MIIDQTCCAimgAwIBAgITBmyfz5m/jAo54vB4ikPmljZbyjANBgkqhkiG9w0BAQsF
ADA5MQswCQYDVQQGEwJVUzEPMA0GA1UEChMGQW1hem9uMRkwFwYDVQQDExBBbWF6
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rqXRfboQnoZsG4q5WTP468SQvvG5
-----END CERTIFICATE-----
# CN=Amazon Root CA 2,O=Amazon,C=US
-----BEGIN CERTIFICATE-----
MIIFQTCCAymgAwIBAgITBmyf0pY1hp8KD+WGePhbJruKNzANBgkqhkiG9w0BAQwF
ADA5MQswCQYDVQQGEwJVUzEPMA0GA1UEChMGQW1hem9uMRkwFwYDVQQDExBBbWF6
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UjANBgkqhkiG9w0BAQwFAAOCAgEAqqiAjw54o+Ci1M3m9Zh6O+oAA7CXDpO8Wqj2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-----END CERTIFICATE-----
# CN=Amazon Root CA 3,O=Amazon,C=US
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
# CN=Amazon Root CA 4,O=Amazon,C=US
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
# CN=Starfield Services Root Certificate Authority - G2,O=Starfield Technologies\, Inc.,L=Scottsdale,ST=Arizona,C=US
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
	`)

	// To facilitate the AWS Trust transition, we need to use combination of old + new:
	CertsCloudfront = append(CertsDOH, CertsAmazon...)

	CertsCloudflare = CertsDOH
)
View Source 
var ErrorTLSPinViolation error = fmt.Errorf("TLS pin violation")

Functions

func AppendPEMCert 

func AppendPEMCert(pem []byte, client *http.Client) error

AppendPEMCert is a convenience function to add the provided PEM-encoded certificate to the provided HTTP client's root CA certificate pool. It should be used in conjuction with Client.ClientDOH and Client.ClientHTTPS.

func GetCertificatePin 

func GetCertificatePin(cert *x509.Certificate) ([]byte, error)

GetCertificatePin is a convenience function to provide a SHA256 hash of a certificate's SPKI

Types

type CertValidationType 

type CertValidationType int
const (
	// CertValidationDefault will use standard root certificate parsing against the
	// system default root certificate store
	CertValidationDefault CertValidationType = iota

	// CertValidationDisable will disable all certificate validation.  USE WITH CAUTION.
	CertValidationDisable

	// CertValidateSPKIPinAnyDefault will use standard root certificate parsing against
	// the system default root certificate store; upon successful validation, the successful
	// cert chain will be further scanned and require at least one SPKI pin (specified in
	// CertValidationPins) be present in the chain.
	CertValidateSPKIPinAnyDefault

	// CertValidateSPKIPinFirst will check the first (leaf) certificate of the site
	// uses an SPKI specified in CertValidationPins.  Since the leaf certificate is
	// explicitly checked, full certificate chain validation is not performed. This is
	// only useful for self-signed certificate usages, where you expect a specific
	// single certificate to be presented by the site.
	CertValidateSPKIPinFirst

	// CertValidationCloudfront uses a limited root CAs certificate store particular to
	// the root CAs used for Cloudfront sites. Only use this method if you are
	// exclusively accessing Cloudfront-fronted websites.
	CertValidationCloudfront
)

type Client 

type Client struct {
	ClientDOH                 *http.Client
	DOHServers                []*DOHServer
	ClientHTTPS               *http.Client
	HTTPSPins                 [][]byte
	TLSErrorCallback          func(source, errorType string, cert *x509.Certificate)
	DOHErrorCallback          func(source, hostname string, err error)
	DateCallback              func(t time.Time)
	TraceCallback             func(traceMsg string)
	CountDOHCacheHits         uint32
	CountDOHRequests          uint32
	CountDOHResponseErrors    uint32
	CountDOHParsingErrors     uint32
	CountDOHOperationalErrors uint32
	CountDOHNoAnswers         uint32
	CountDOHOk                uint32
	CountDOHResumed           uint32
	CountClientResumed        uint32
	CountClientRequests       uint32
	CountClientOk             uint32
	CountClientErrors         uint32
	// contains filtered or unexported fields
}

func New 

func New(cfg Config) (*Client, error)

Create a new Strongcomms client, using the specified Config.

func (*Client) Do 

func (s *Client) Do(r *http.Request) (*http.Response, error)

Perform an HTTP(S) request, similar to http.Client.Do().

func (*Client) GetTime 

func (s *Client) GetTime(tm time.Time) (time.Time, error)

Establish the concept of current time using DOH servers. This is meant for IoT devices with no RTC, that must securely set the time (and prefer to not use NTP). Passed-in time can be zero-time or time.Now(), and is assumed to potentially be inaccurate (just taken as a starting point).

func (*Client) GetTimeWithContext 

func (s *Client) GetTimeWithContext(tm time.Time, ctx context.Context) (time.Time, error)

func (*Client) LookupIP 

func (s *Client) LookupIP(hostname string) ([]net.IP, error)

Lookup up IP addresses (A records/IPv4) for the given hostname. Meant to be similar to net.LookupIP() (minus the IPv6 support).

func (*Client) SetCache 

func (s *Client) SetCache(hostname string, ips []net.IP)

Override the resolution for the given hostname. This will create a non-expiring cache entry for the give hostname. If the list of IPs is empty/nil, then the existing cache entry (static or otherwise) will be removed.

func (*Client) TestNetwork 

func (s *Client) TestNetwork() bool

TestNetwork is a legacy function that simply calls TestNetworkWithContext() using a calculated timeout of DefaultTimeoutDOH * the number of configured DOH servers.

func (*Client) TestNetworkWithContext 

func (s *Client) TestNetworkWithContext(ctx context.Context) bool

TestNetworkWithContext is a utility function to 'test' the network by attempting a TCP connection (IPv4) to the configured DOH server(s). This function will internally keep trying until either a successful connection is made, or the given context triggers a timeout, deadline, or cancel.

type Config 

type Config struct {
	// UseCloudflareDOH, when true, will configure default Cloudflare DOH support
	UseCloudflareDOH bool

	// UseGoogleDOH, when true, will configure default Google DOH support
	UseGoogleDOH bool

	// UseQuad9DOH, when true, will configure default Quad9 DOH support
	UseQuad9DOH bool

	// TimeoutDOH controls DOH lookup timeout; if not set, DefaultTimeoutDOH will be used
	TimeoutDOH time.Duration

	// TimeoutHTTPSTotal controls total HTTPS request timeout; if not set,
	// DefaultTimeoutHTTPSTotal will be used
	TimeoutHTTPSTotal time.Duration

	// TimeoutHTTPSSetup controls setup/request phase HTTPS timeout; if not set,
	// DefaultTimeoutHTTPSSetup will be used
	TimeoutHTTPSSetup time.Duration

	// CertValidationType indicates the type of certificate validation to perform for
	// HTTPS requests
	CertValidationType CertValidationType

	// CertValidationPins specifies one or more SPKI hashes (SHA256), when using
	// CertValidateSPKIPinAnyDefault or CertValidateSPKIPinFirst CertValidationType types.
	CertValidationPins [][]byte

	// ProxyConfig specifies an optional HTTP/HTTPS proxy configuration. The default nil
	// value will use the system standard http.ProxyFromEnvironment().  To explicitly
	// disable all proxies (i.e. override the environment values), create a ProxyConfig
	// with an empty ProxyUrl value.
	//
	// Special note: certificate validation of HTTPS proxies is shared with the
	// validation configuration for HTTPS websites. Please see LIMITATIONS documentation
	// regarding configuration nuances and conflicting settings for proxy HTTPS and website
	// HTTPS certificate validation.
	ProxyConfig *ProxyConfig
}

Configuration of Strongcomms client

type DOHServer 

type DOHServer struct {
	Url     string
	Dial    string
	Timeout time.Duration
}

type Dialer 

type Dialer func(network, addr string) (net.Conn, error)

type ProxyConfig 

type ProxyConfig struct {
	// ProxyUrl should specify a proxy address value that is compatible to the format
	// documented in http.ProxyFromEnvironment(). Setting an empty string value is
	// the equivalent to explicitly disabling all proxy support (including ignoring
	// any values set in the environment).
	Url string

	// ProxyCertsPEM, if not empty, can contain one or more PEM-encoded certificates. The
	// PEM-encoded certificates will be decoded and added into the TLS certificate pools.
	//
	// Special note: certificate validation of HTTPS proxies is shared with the
	// validation configuration for HTTPS websites. Please see LIMITATIONS documentation
	// regarding configuration nuances and conflicting settings for proxy HTTPS and website
	// HTTPS certificate validation.
	CertsPEM []byte
}

Proxy configuration of Strongcomms client

Source Files

View all Source files

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