ubiquity

package
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 Go to latest Published: May 1, 2017 License: BSD-2-Clause Imports: 14 Imported by: 0

Documentation

Overview

Package ubiquity contains the ubiquity scoring logic for CFSSL bundling.

Index

Constants

This section is empty.

Variables

View Source 
var Platforms []Platform

Platforms is the list of platforms against which ubiquity bundling will be optimized.

View Source 
var SHA1DeprecationPolicys = []SHA1DeprecationPolicy{

	{
		Platform:       "Google Chrome",
		Description:    "shows the SSL connection has minor problems",
		Severity:       Medium,
		ExpiryDeadline: time.Date(2016, time.January, 1, 0, 0, 0, 0, time.UTC),
	},

	{
		Platform:       "Google Chrome",
		Description:    "shows the SSL connection is untrusted",
		Severity:       High,
		ExpiryDeadline: time.Date(2017, time.January, 1, 0, 0, 0, 0, time.UTC),
	},

	{
		Platform:       "Mozilla Firefox",
		Description:    "gives warning in the developer console",
		Severity:       Low,
		ExpiryDeadline: time.Date(2017, time.January, 1, 0, 0, 0, 0, time.UTC),
	},

	{
		Platform:        "Mozilla Firefox",
		Description:     "shows the SSL connection is untrusted",
		Severity:        Medium,
		EffectiveDate:   time.Date(2016, time.January, 1, 0, 0, 0, 0, time.UTC),
		NeverIssueAfter: time.Date(2016, time.January, 1, 0, 0, 0, 0, time.UTC),
	},

	{
		Platform:       "Mozilla Firefox",
		Description:    "shows the SSL connection is untrusted",
		Severity:       High,
		EffectiveDate:  time.Date(2017, time.January, 1, 0, 0, 0, 0, time.UTC),
		ExpiryDeadline: time.Date(2017, time.January, 1, 0, 0, 0, 0, time.UTC),
	},

	{
		Platform:       "Microsoft Windows Vista and later",
		Description:    "shows the SSL connection is untrusted",
		Severity:       High,
		EffectiveDate:  time.Date(2017, time.January, 1, 0, 0, 0, 0, time.UTC),
		ExpiryDeadline: time.Date(2017, time.January, 1, 0, 0, 0, 0, time.UTC),
	},
}

SHA1DeprecationPolicys ia a list of various SHA1DeprecationPolicy's proposed by major browser producers

Functions

func CompareChainCryptoSuite 

func CompareChainCryptoSuite(chain1, chain2 []*x509.Certificate) int

CompareChainCryptoSuite ranks chains with more current crypto suite higher.

func CompareChainExpiry 

func CompareChainExpiry(chain1, chain2 []*x509.Certificate) int

CompareChainExpiry ranks chain that lasts longer higher.

func CompareChainHashPriority 

func CompareChainHashPriority(chain1, chain2 []*x509.Certificate) int

CompareChainHashPriority ranks chains with more current hash functions higher.

func CompareChainHashUbiquity 

func CompareChainHashUbiquity(chain1, chain2 []*x509.Certificate) int

CompareChainHashUbiquity returns a positive, zero, or negative value if the hash ubiquity of the first chain is greater, equal, or less than the second chain.

func CompareChainKeyAlgoPriority 

func CompareChainKeyAlgoPriority(chain1, chain2 []*x509.Certificate) int

CompareChainKeyAlgoPriority ranks chains with more current key algorithm higher.

func CompareChainKeyAlgoUbiquity 

func CompareChainKeyAlgoUbiquity(chain1, chain2 []*x509.Certificate) int

CompareChainKeyAlgoUbiquity returns a positive, zero, or negative value if the public-key ubiquity of the first chain is greater, equal, or less than the second chain.

func CompareChainLength 

func CompareChainLength(chain1, chain2 []*x509.Certificate) int

CompareChainLength ranks shorter chain higher.

func CompareExpiryUbiquity 

func CompareExpiryUbiquity(chain1, chain2 []*x509.Certificate) int

CompareExpiryUbiquity ranks two certificate chains based on the exiry dates of intermediates and roots. Certs expire later are ranked higher than ones expire earlier. The ranking between chains are determined by the first pair of intermediates, scanned from the root level, that ar ranked differently.

func ComparePlatformUbiquity 

func ComparePlatformUbiquity(chain1, chain2 []*x509.Certificate) int

ComparePlatformUbiquity compares the cross-platform ubiquity between chain1 and chain2.

func CompareSHA2Homogeneity 

func CompareSHA2Homogeneity(chain1, chain2 []*x509.Certificate) int

CompareSHA2Homogeneity compares the chains based on SHA2 homogeneity. Full SHA-2 chain (excluding root) is rated higher that the rest.

func CrossPlatformUbiquity 

func CrossPlatformUbiquity(chain []*x509.Certificate) int

CrossPlatformUbiquity returns a ubiquity score (persumably relecting the market share in percentage) based on whether the given chain can be verified with the different platforms' root certificate stores.

func Filter 

func Filter(chains [][]*x509.Certificate, f RankingFunc) [][]*x509.Certificate

Filter filters out the chains with highest rank according to the ranking function f.

func HashPriority 

func HashPriority(certs []*x509.Certificate) int

HashPriority returns the hash priority of the chain as the average of hash priority of certs in it.

func KeyAlgoPriority 

func KeyAlgoPriority(certs []*x509.Certificate) int

KeyAlgoPriority returns the key algorithm priority of the chain as the average of key algorithm priority of certs in it.

func LoadPlatforms 

func LoadPlatforms(filename string) error

LoadPlatforms reads the file content as a json object array and convert it to Platforms.

func SHA1DeprecationMessages 

func SHA1DeprecationMessages(chain []*x509.Certificate) []string

SHA1DeprecationMessages returns a list of human-readable messages. Each message describes how one platform rejects the chain based on SHA1 deprecation policies.

func SHA1RawPublicKey 

func SHA1RawPublicKey(cert *x509.Certificate) string

SHA1RawPublicKey returns a SHA1 hash of the raw certificate public key

func SHA2Homogeneity 

func SHA2Homogeneity(chain []*x509.Certificate) int

SHA2Homogeneity returns 1 if the chain contains only SHA-2 certs (excluding root). Otherwise it returns 0.

func UntrustedPlatforms 

func UntrustedPlatforms(root *x509.Certificate) []string

UntrustedPlatforms returns a list of platforms which don't trust the root certificate.

Types

type CertSet 

type CertSet map[string]bool

CertSet is a succint set of x509 certificates which only stores certificates' SHA1 hashes.

func (CertSet) Add 

func (s CertSet) Add(cert *x509.Certificate)

Add adds a certificate to the set.

func (CertSet) Lookup 

func (s CertSet) Lookup(cert *x509.Certificate) bool

Lookup returns whether a certificate is stored in the set.

type DeprecationSeverity 

type DeprecationSeverity int

DeprecationSeverity encodes the severity of a deprecation policy 

const (
	// None indicates there is no deprecation
	None DeprecationSeverity = iota
	// Low indicates the deprecation policy won't affect user experience
	Low
	// Medium indicates the deprecation policy will affect user experience
	// either in a minor way or for a limited scope of users.
	Medium
	// High indicates the deprecation policy will strongly affect user experience
	High
)

type HashUbiquity 

type HashUbiquity int

HashUbiquity represents a score for how ubiquitous a given hash algorithm is; the higher the score, the more preferable the algorithm is. 

const (
	UnknownHashUbiquity HashUbiquity = 0
	SHA2Ubiquity        HashUbiquity = 70
	SHA1Ubiquity        HashUbiquity = 100
	MD5Ubiquity         HashUbiquity = 0
	MD2Ubiquity         HashUbiquity = 0
)

SHA1 is ubiquitous. SHA2 is not supported on some legacy platforms. We consider MD2/MD5 is harmful and thus assign them lowest ubiquity.

func ChainHashUbiquity 

func ChainHashUbiquity(chain []*x509.Certificate) HashUbiquity

ChainHashUbiquity scores a chain based on the hash algorithms used by the certificates in the chain.

type KeyAlgoUbiquity 

type KeyAlgoUbiquity int

KeyAlgoUbiquity represents a score for how ubiquitous a given public-key algorithm is; the higher the score, the more preferable the algorithm is. 

const (
	RSAUbiquity         KeyAlgoUbiquity = 100
	DSAUbiquity         KeyAlgoUbiquity = 100
	ECDSA256Ubiquity    KeyAlgoUbiquity = 70
	ECDSA384Ubiquity    KeyAlgoUbiquity = 70
	ECDSA521Ubiquity    KeyAlgoUbiquity = 30
	UnknownAlgoUbiquity KeyAlgoUbiquity = 0
)

RSA and DSA are considered ubiquitous. ECDSA256 and ECDSA384 should be supported by TLS 1.2 and have limited support from TLS 1.0 and 1.1, based on RFC6460, but ECDSA521 is less well-supported as a standard.

func ChainKeyAlgoUbiquity 

func ChainKeyAlgoUbiquity(chain []*x509.Certificate) KeyAlgoUbiquity

ChainKeyAlgoUbiquity scores a chain based on the public-key algorithms used by the certificates in the chain.

type Platform 

type Platform struct {
	Name            string `json:"name"`
	Weight          int    `json:"weight"`
	HashAlgo        string `json:"hash_algo"`
	KeyAlgo         string `json:"key_algo"`
	KeyStoreFile    string `json:"keystore"`
	KeyStore        CertSet
	HashUbiquity    HashUbiquity
	KeyAlgoUbiquity KeyAlgoUbiquity
}

A Platform contains ubiquity information on supported crypto algorithms and root certificate store name.

func (*Platform) ParseAndLoad 

func (p *Platform) ParseAndLoad() (ok bool)

ParseAndLoad converts HashAlgo and KeyAlgo to corresponding ubiquity value and load certificates into internal KeyStore from KeyStoreFiles

func (Platform) Trust 

func (p Platform) Trust(root *x509.Certificate) bool

Trust returns whether the platform has the root cert in the trusted store.

type RankingFunc 

type RankingFunc func(chain1, chain2 []*x509.Certificate) int

RankingFunc returns the relative rank between chain1 and chain2. Return value: 

positive integer if rank(chain1) > rank(chain2),
negative integer if rank(chain1) < rank(chain2),
0 if rank(chain1) == (chain2).

type SHA1DeprecationPolicy 

type SHA1DeprecationPolicy struct {
	// the name of platform
	Platform string `json:"platform"`
	// policy severity, policies of the same platform will only trigger the one of highest severity
	Severity DeprecationSeverity `json:"severity"`
	// a human readable message describing the deprecation effects
	Description string `json:"description"`
	// the date when the policy is effective. zero value means effective immediately
	EffectiveDate time.Time `json:"effective_date"`
	// the expiry deadline indicates the latest date which a end-entity
	// certificate with SHA1 can be valid through.
	ExpiryDeadline time.Time `json:"expiry_deadline"`
	// the date beyond which SHA1 cert should not be issued.
	NeverIssueAfter time.Time `json:"never_issue_after"`
}

SHA1DeprecationPolicy encodes how a platform deprecates the support of SHA1

func (SHA1DeprecationPolicy) Flag 

func (p SHA1DeprecationPolicy) Flag(chain []*x509.Certificate) bool

Flag returns whether the policy flags the cert chain as deprecated for matching its deprecation criteria

Source Files

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