// LoadConfig attempts to load the configuration from a byte slice.
// On error, it returns nil.
func LoadConfig(config []byte) (*Config, error) {
var cfg = &Config{}
err := json.Unmarshal(config, &cfg)
if err != nil {
return nil, cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy,
errors.New("failed to unmarshal configuration: "+err.Error()))
}
if cfg.Signing == nil {
return nil, errors.New("No \"signing\" field present")
}
if cfg.Signing.Default == nil {
log.Debugf("no default given: using default config")
cfg.Signing.Default = DefaultConfig()
} else {
if err := cfg.Signing.Default.populate(cfg); err != nil {
return nil, err
}
}
for k := range cfg.Signing.Profiles {
if err := cfg.Signing.Profiles[k].populate(cfg); err != nil {
return nil, err
}
}
if !cfg.Valid() {
return nil, cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy, errors.New("invalid configuration"))
}
log.Debugf("configuration ok")
return cfg, nil
}
// BundleFromRemote fetches the certificate served by the server at
// serverName (or ip, if the ip argument is not the empty string). It
// is expected that the method will be able to make a connection at
// port 443. The certificate used by the server in this connection is
// used to build the bundle, which will necessarily be keyless.
func (b *Bundler) BundleFromRemote(serverName, ip string, flavor BundleFlavor) (*Bundle, error) {
config := &tls.Config{
RootCAs: b.RootPool,
ServerName: serverName,
}
// Dial by IP if present
var dialName string
if ip != "" {
dialName = ip + ":443"
} else {
dialName = serverName + ":443"
}
log.Debugf("bundling from remote %s", dialName)
dialer := &net.Dialer{Timeout: time.Duration(5) * time.Second}
conn, err := tls.DialWithDialer(dialer, "tcp", dialName, config)
var dialError string
// If there's an error in tls.Dial, try again with
// InsecureSkipVerify to fetch the remote bundle to (re-)bundle
// with. If the bundle is indeed not usable (expired, mismatched
// hostnames, etc.), report the error. Otherwise, create a
// working bundle and insert the tls error in the bundle.Status.
if err != nil {
log.Debugf("dial failed: %v", err)
// record the error msg
dialError = fmt.Sprintf("Failed rigid TLS handshake with %s: %v", dialName, err)
// dial again with InsecureSkipVerify
log.Debugf("try again with InsecureSkipVerify.")
config.InsecureSkipVerify = true
conn, err = tls.DialWithDialer(dialer, "tcp", dialName, config)
if err != nil {
log.Debugf("dial with InsecureSkipVerify failed: %v", err)
return nil, errors.Wrap(errors.DialError, errors.Unknown, err)
}
}
connState := conn.ConnectionState()
certs := connState.PeerCertificates
err = conn.VerifyHostname(serverName)
if err != nil {
log.Debugf("failed to verify hostname: %v", err)
return nil, errors.Wrap(errors.CertificateError, errors.VerifyFailed, err)
}
// Bundle with remote certs. Inject the initial dial error, if any, to the status reporting.
bundle, err := b.Bundle(certs, nil, flavor)
if err != nil {
return nil, err
} else if dialError != "" {
bundle.Status.Messages = append(bundle.Status.Messages, dialError)
}
return bundle, err
}
// Generate generates a key as specified in the request. Currently,
// only ECDSA and RSA are supported.
func (kr *KeyRequest) Generate() (interface{}, error) {
log.Debugf("generate key from request: algo=%s, size=%d", kr.Algo, kr.Size)
switch kr.Algo {
case "rsa":
if kr.Size < 2048 {
return nil, errors.New("RSA key is too weak")
}
return rsa.GenerateKey(rand.Reader, kr.Size)
case "ecdsa":
var curve elliptic.Curve
switch kr.Size {
case curveP256:
curve = elliptic.P256()
case curveP384:
curve = elliptic.P384()
case curveP521:
curve = elliptic.P521()
default:
return nil, errors.New("invalid curve")
}
return ecdsa.GenerateKey(curve, rand.Reader)
default:
return nil, errors.New("invalid algorithm")
}
}
// LoadFile attempts to load the db configuration file stored at the path
// and returns the configuration. On error, it returns nil.
func LoadFile(path string) (cfg *DBConfig, err error) {
log.Debugf("loading db configuration file from %s", path)
if path == "" {
return nil, cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy, errors.New("invalid path"))
}
var body []byte
body, err = ioutil.ReadFile(path)
if err != nil {
return nil, cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy, errors.New("could not read configuration file"))
}
cfg = &DBConfig{}
err = json.Unmarshal(body, &cfg)
if err != nil {
return nil, cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy,
errors.New("failed to unmarshal configuration: "+err.Error()))
}
if cfg.DataSourceName == "" || cfg.DriverName == "" {
return nil, cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy, errors.New("invalid db configuration"))
}
return
}
// Generate generates a key as specified in the request. Currently,
// only ECDSA and RSA are supported.
func (kr *BasicKeyRequest) Generate() (crypto.PrivateKey, error) {
log.Debugf("generate key from request: algo=%s, size=%d", kr.Algo(), kr.Size())
switch kr.Algo() {
case "rsa":
if kr.Size() < 2048 {
return nil, errors.New("RSA key is too weak")
}
if kr.Size() > 8192 {
return nil, errors.New("RSA key size too large")
}
return rsa.GenerateKey(rand.Reader, kr.Size())
case "ecdsa":
var curve elliptic.Curve
switch kr.Size() {
case curveP256:
curve = elliptic.P256()
case curveP384:
curve = elliptic.P384()
case curveP521:
curve = elliptic.P521()
default:
return nil, errors.New("invalid curve")
}
return ecdsa.GenerateKey(curve, rand.Reader)
default:
return nil, errors.New("invalid algorithm")
}
}
func (b *Bundler) verifyChain(chain []*fetchedIntermediate) bool {
// This process will verify if the root of the (partial) chain is in our root pool,
// and will fail otherwise.
log.Debugf("verifying chain")
for vchain := chain[:]; len(vchain) > 0; vchain = vchain[1:] {
cert := vchain[0]
// If this is a certificate in one of the pools, skip it.
if b.KnownIssuers[string(cert.Cert.Signature)] {
log.Debugf("certificate is known")
continue
}
_, err := cert.Cert.Verify(b.VerifyOptions())
if err != nil {
log.Debugf("certificate failed verification: %v", err)
return false
} else if len(chain) == len(vchain) && isChainRootNode(cert.Cert) {
// The first certificate in the chain is a root; it shouldn't be stored.
log.Debug("looking at root certificate, will not store")
continue
}
// leaf cert has an empty name, don't store leaf cert.
if cert.Name == "" {
continue
}
log.Debug("add certificate to intermediate pool:", cert.Name)
b.IntermediatePool.AddCert(cert.Cert)
b.KnownIssuers[string(cert.Cert.Signature)] = true
fileName := filepath.Join(IntermediateStash, cert.Name)
var block = pem.Block{Type: "CERTIFICATE", Bytes: cert.Cert.Raw}
log.Debugf("write intermediate to stash directory: %s", fileName)
// If the write fails, verification should not fail.
err = ioutil.WriteFile(fileName, pem.EncodeToMemory(&block), 0644)
if err != nil {
log.Errorf("failed to write new intermediate: %v", err)
} else {
log.Info("stashed new intermediate ", cert.Name)
}
}
return true
}
// fetchRemoteCertificate retrieves a single URL pointing to a certificate
// and attempts to first parse it as a DER-encoded certificate; if
// this fails, it attempts to decode it as a PEM-encoded certificate.
func fetchRemoteCertificate(certURL string) (fi *fetchedIntermediate, err error) {
log.Debugf("fetching remote certificate: %s", certURL)
var resp *http.Response
resp, err = http.Get(certURL)
if err != nil {
log.Debugf("failed HTTP get: %v", err)
return
}
defer resp.Body.Close()
var certData []byte
certData, err = ioutil.ReadAll(resp.Body)
if err != nil {
log.Debugf("failed to read response body: %v", err)
return
}
log.Debugf("attempting to parse certificate as DER")
crt, err := x509.ParseCertificate(certData)
if err != nil {
log.Debugf("attempting to parse certificate as PEM")
crt, err = helpers.ParseCertificatePEM(certData)
if err != nil {
log.Debugf("failed to parse certificate: %v", err)
return
}
}
log.Debugf("certificate fetch succeeds")
fi = &fetchedIntermediate{Cert: crt, Name: constructCertFileName(crt)}
return
}
// Valid checks the signature policies, ensuring they are valid
// policies. A policy is valid if it has defined at least key usages
// to be used, and a valid default profile has defined at least a
// default expiration.
func (p *Signing) Valid() bool {
if p == nil {
return false
}
log.Debugf("validating configuration")
if !p.Default.validProfile(true) {
log.Debugf("default profile is invalid")
return false
}
for _, sp := range p.Profiles {
if !sp.validProfile(false) {
log.Debugf("invalid profile")
return false
}
}
return true
}
// UnmarshalJSON unmarshals a JSON string into an OID.
func (oid *OID) UnmarshalJSON(data []byte) (err error) {
if data[0] != '"' || data[len(data)-1] != '"' {
return errors.New("OID JSON string not wrapped in quotes." + string(data))
}
data = data[1 : len(data)-1]
parsedOid, err := parseObjectIdentifier(string(data))
if err != nil {
return err
}
*oid = OID(parsedOid)
log.Debugf("Parsed OID %v", *oid)
return
}
// LoadFile attempts to load the configuration file stored at the path
// and returns the configuration. On error, it returns nil.
func LoadFile(path string) (*Config, error) {
log.Debugf("loading configuration file from %s", path)
if path == "" {
return nil, cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy, errors.New("invalid path"))
}
body, err := ioutil.ReadFile(path)
if err != nil {
return nil, cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy, errors.New("could not read configuration file"))
}
return LoadConfig(body)
}
// BundleFromPEM builds a certificate bundle from the set of byte
// slices containing the PEM-encoded certificate(s), private key.
func (b *Bundler) BundleFromPEM(certsPEM, keyPEM []byte, flavor BundleFlavor) (*Bundle, error) {
log.Debug("bundling from PEM files")
var key crypto.Signer
var err error
if len(keyPEM) != 0 {
key, err = helpers.ParsePrivateKeyPEM(keyPEM)
if err != nil {
log.Debugf("failed to parse private key: %v", err)
return nil, err
}
}
certs, err := helpers.ParseCertificatesPEM(certsPEM)
if err != nil {
log.Debugf("failed to parse certificates: %v", err)
return nil, err
} else if len(certs) == 0 {
log.Debugf("no certificates found")
return nil, errors.New(errors.CertificateError, errors.DecodeFailed)
}
log.Debugf("bundle ready")
return b.Bundle(certs, key, flavor)
}
// ParseCertificatePEM parses and returns a PEM-encoded certificate,
// can handle PEM encoded PKCS #7 structures.
func ParseCertificatePEM(certPEM []byte) (*x509.Certificate, error) {
certPEM = bytes.TrimSpace(certPEM)
cert, rest, err := ParseOneCertificateFromPEM(certPEM)
if err != nil {
// Log the actual parsing error but throw a default parse error message.
log.Debugf("Certificate parsing error: %v", err)
return nil, cferr.New(cferr.CertificateError, cferr.ParseFailed)
} else if cert == nil {
return nil, cferr.New(cferr.CertificateError, cferr.DecodeFailed)
} else if len(rest) > 0 {
return nil, cferr.Wrap(cferr.CertificateError, cferr.ParseFailed, errors.New("the PEM file should contain only one object"))
} else if len(cert) > 1 {
return nil, cferr.Wrap(cferr.CertificateError, cferr.ParseFailed, errors.New("the PKCS7 object in the PEM file should contain only one certificate"))
}
return cert[0], nil
}
// A valid profile must be a valid local profile or a valid remote profile.
// A valid local profile has defined at least key usages to be used, and a
// valid local default profile has defined at least a default expiration.
// A valid remote profile (default or not) has remote signer initialized.
// In addition, a remote profile must has a valid auth provider if auth
// key defined.
func (p *SigningProfile) validProfile(isDefault bool) bool {
if p == nil {
return false
}
if p.RemoteName != "" {
log.Debugf("validate remote profile")
if p.RemoteServer == "" {
log.Debugf("invalid remote profile: no remote signer specified")
return false
}
if p.AuthKeyName != "" && p.Provider == nil {
log.Debugf("invalid remote profile: auth key name is defined but no auth provider is set")
return false
}
} else {
log.Debugf("validate local profile")
if !isDefault {
if len(p.Usage) == 0 {
log.Debugf("invalid local profile: no usages specified")
return false
} else if _, _, unk := p.Usages(); len(unk) == len(p.Usage) {
log.Debugf("invalid local profile: no valid usages")
return false
}
} else {
if p.Expiry == 0 {
log.Debugf("invalid local profile: no expiry set")
return false
}
}
}
log.Debugf("profile is valid")
return true
}
// New returns a new PKCS #11 signer.
func NewPKCS11Signer(cfg ocspConfig.Config) (ocsp.Signer, error) {
log.Debugf("Loading PKCS #11 module %s", cfg.PKCS11.Module)
certData, err := ioutil.ReadFile(cfg.CACertFile)
if err != nil {
return nil, errors.New(errors.CertificateError, errors.ReadFailed)
}
cert, err := helpers.ParseCertificatePEM(certData)
if err != nil {
return nil, err
}
PKCS11 := cfg.PKCS11
priv, err := pkcs11key.New(PKCS11.Module, PKCS11.Token, PKCS11.PIN,
PKCS11.Label)
if err != nil {
return nil, errors.New(errors.PrivateKeyError, errors.ReadFailed)
}
return ocsp.NewSigner(cert, cert, priv, cfg.Interval)
}
// BundleFromFile takes a set of files containing the PEM-encoded leaf certificate
// (optionally along with some intermediate certs), the PEM-encoded private key
// and returns the bundle built from that key and the certificate(s).
func (b *Bundler) BundleFromFile(bundleFile, keyFile string, flavor BundleFlavor) (*Bundle, error) {
log.Debug("Loading Certificate: ", bundleFile)
certsPEM, err := ioutil.ReadFile(bundleFile)
if err != nil {
return nil, errors.Wrap(errors.CertificateError, errors.ReadFailed, err)
}
var keyPEM []byte
// Load private key PEM only if a file is given
if keyFile != "" {
log.Debug("Loading private key: ", keyFile)
keyPEM, err = ioutil.ReadFile(keyFile)
if err != nil {
log.Debugf("failed to read private key: ", err)
return nil, errors.Wrap(errors.PrivateKeyError, errors.ReadFailed, err)
}
if len(keyPEM) == 0 {
log.Debug("key is empty")
return nil, errors.Wrap(errors.PrivateKeyError, errors.DecodeFailed, err)
}
}
return b.BundleFromPEM(certsPEM, keyPEM, flavor)
}
// New returns a new PKCS #11 signer.
func New(caCertFile string, policy *config.Signing, cfg *pkcs11key.Config) (signer.Signer, error) {
if cfg == nil {
return nil, errors.New(errors.PrivateKeyError, errors.ReadFailed)
}
log.Debugf("Loading PKCS #11 module %s", cfg.Module)
certData, err := ioutil.ReadFile(caCertFile)
if err != nil {
return nil, errors.New(errors.PrivateKeyError, errors.ReadFailed)
}
cert, err := helpers.ParseCertificatePEM(certData)
if err != nil {
return nil, err
}
priv, err := pkcs11key.New(cfg.Module, cfg.TokenLabel, cfg.PIN, cfg.PrivateKeyLabel)
if err != nil {
return nil, errors.New(errors.PrivateKeyError, errors.ReadFailed)
}
sigAlgo := signer.DefaultSigAlgo(priv)
return local.NewSigner(priv, cert, sigAlgo, policy)
}
// populate is used to fill in the fields that are not in JSON
//
// First, the ExpiryString parameter is needed to parse
// expiration timestamps from JSON. The JSON decoder is not able to
// decode a string time duration to a time.Duration, so this is called
// when loading the configuration to properly parse and fill out the
// Expiry parameter.
// This function is also used to create references to the auth key
// and default remote for the profile.
// It returns true if ExpiryString is a valid representation of a
// time.Duration, and the AuthKeyString and RemoteName point to
// valid objects. It returns false otherwise.
func (p *SigningProfile) populate(cfg *Config) error {
if p == nil {
return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy, errors.New("can't parse nil profile"))
}
var err error
if p.RemoteName == "" {
log.Debugf("parse expiry in profile")
if p.ExpiryString == "" {
return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy, errors.New("empty expiry string"))
}
dur, err := time.ParseDuration(p.ExpiryString)
if err != nil {
return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy, err)
}
log.Debugf("expiry is valid")
p.Expiry = dur
if p.BackdateString != "" {
dur, err = time.ParseDuration(p.BackdateString)
if err != nil {
return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy, err)
}
p.Backdate = dur
}
if !p.NotBefore.IsZero() && !p.NotAfter.IsZero() && p.NotAfter.Before(p.NotBefore) {
return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy, err)
}
if len(p.PolicyStrings) > 0 {
p.Policies = make([]asn1.ObjectIdentifier, len(p.PolicyStrings))
for i, oidString := range p.PolicyStrings {
p.Policies[i], err = parseObjectIdentifier(oidString)
if err != nil {
return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy, err)
}
}
}
} else {
log.Debug("match remote in profile to remotes section")
if remote := cfg.Remotes[p.RemoteName]; remote != "" {
if err := p.updateRemote(remote); err != nil {
return err
}
} else {
return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy,
errors.New("failed to find remote in remotes section"))
}
}
if p.AuthKeyName != "" {
log.Debug("match auth key in profile to auth_keys section")
if key, ok := cfg.AuthKeys[p.AuthKeyName]; ok == true {
if key.Type == "standard" {
p.Provider, err = auth.New(key.Key, nil)
if err != nil {
log.Debugf("failed to create new standard auth provider: %v", err)
return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy,
errors.New("failed to create new standard auth provider"))
}
} else {
log.Debugf("unknown authentication type %v", key.Type)
return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy,
errors.New("unknown authentication type"))
}
} else {
return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy,
errors.New("failed to find auth_key in auth_keys section"))
}
}
return nil
}
// populate is used to fill in the fields that are not in JSON
//
// First, the ExpiryString parameter is needed to parse
// expiration timestamps from JSON. The JSON decoder is not able to
// decode a string time duration to a time.Duration, so this is called
// when loading the configuration to properly parse and fill out the
// Expiry parameter.
// This function is also used to create references to the auth key
// and default remote for the profile.
// It returns true if ExpiryString is a valid representation of a
// time.Duration, and the AuthKeyString and RemoteName point to
// valid objects. It returns false otherwise.
func (p *SigningProfile) populate(cfg *Config) error {
if p == nil {
return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy, errors.New("can't parse nil profile"))
}
var err error
if p.RemoteName == "" && p.AuthRemote.RemoteName == "" {
log.Debugf("parse expiry in profile")
if p.ExpiryString == "" {
return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy, errors.New("empty expiry string"))
}
dur, err := time.ParseDuration(p.ExpiryString)
if err != nil {
return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy, err)
}
log.Debugf("expiry is valid")
p.Expiry = dur
if p.BackdateString != "" {
dur, err = time.ParseDuration(p.BackdateString)
if err != nil {
return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy, err)
}
p.Backdate = dur
}
if !p.NotBefore.IsZero() && !p.NotAfter.IsZero() && p.NotAfter.Before(p.NotBefore) {
return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy, err)
}
if len(p.Policies) > 0 {
for _, policy := range p.Policies {
for _, qualifier := range policy.Qualifiers {
if qualifier.Type != "" && qualifier.Type != "id-qt-unotice" && qualifier.Type != "id-qt-cps" {
return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy,
errors.New("invalid policy qualifier type"))
}
}
}
}
} else if p.RemoteName != "" {
log.Debug("match remote in profile to remotes section")
if p.AuthRemote.RemoteName != "" {
log.Error("profile has both a remote and an auth remote specified")
return cferr.New(cferr.PolicyError, cferr.InvalidPolicy)
}
if remote := cfg.Remotes[p.RemoteName]; remote != "" {
if err := p.updateRemote(remote); err != nil {
return err
}
} else {
return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy,
errors.New("failed to find remote in remotes section"))
}
} else {
log.Debug("match auth remote in profile to remotes section")
if remote := cfg.Remotes[p.AuthRemote.RemoteName]; remote != "" {
if err := p.updateRemote(remote); err != nil {
return err
}
} else {
return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy,
errors.New("failed to find remote in remotes section"))
}
}
if p.AuthKeyName != "" {
log.Debug("match auth key in profile to auth_keys section")
if key, ok := cfg.AuthKeys[p.AuthKeyName]; ok == true {
if key.Type == "standard" {
p.Provider, err = auth.New(key.Key, nil)
if err != nil {
log.Debugf("failed to create new standard auth provider: %v", err)
return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy,
errors.New("failed to create new standard auth provider"))
}
} else {
log.Debugf("unknown authentication type %v", key.Type)
return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy,
errors.New("unknown authentication type"))
}
} else {
return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy,
errors.New("failed to find auth_key in auth_keys section"))
}
}
if p.AuthRemote.AuthKeyName != "" {
log.Debug("match auth remote key in profile to auth_keys section")
if key, ok := cfg.AuthKeys[p.AuthRemote.AuthKeyName]; ok == true {
if key.Type == "standard" {
p.RemoteProvider, err = auth.New(key.Key, nil)
if err != nil {
log.Debugf("failed to create new standard auth provider: %v", err)
return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy,
errors.New("failed to create new standard auth provider"))
}
} else {
log.Debugf("unknown authentication type %v", key.Type)
return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy,
errors.New("unknown authentication type"))
}
} else {
return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy,
errors.New("failed to find auth_remote's auth_key in auth_keys section"))
}
}
if p.NameWhitelistString != "" {
log.Debug("compiling whitelist regular expression")
rule, err := regexp.Compile(p.NameWhitelistString)
if err != nil {
return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy,
errors.New("failed to compile name whitelist section"))
}
p.NameWhitelist = rule
}
return nil
}
// Bundle takes an X509 certificate (already in the
// Certificate structure), a private key as crypto.Signer in one of the appropriate
// formats (i.e. *rsa.PrivateKey or *ecdsa.PrivateKey, or even a opaque key), using them to
// build a certificate bundle.
func (b *Bundler) Bundle(certs []*x509.Certificate, key crypto.Signer, flavor BundleFlavor) (*Bundle, error) {
log.Infof("bundling certificate for %+v", certs[0].Subject)
if len(certs) == 0 {
return nil, nil
}
// Detect reverse ordering of the cert chain.
if len(certs) > 1 && !partialVerify(certs) {
rcerts := reverse(certs)
if partialVerify(rcerts) {
certs = rcerts
}
}
var ok bool
cert := certs[0]
if key != nil {
switch {
case cert.PublicKeyAlgorithm == x509.RSA:
var rsaPublicKey *rsa.PublicKey
if rsaPublicKey, ok = key.Public().(*rsa.PublicKey); !ok {
return nil, errors.New(errors.PrivateKeyError, errors.KeyMismatch)
}
if cert.PublicKey.(*rsa.PublicKey).N.Cmp(rsaPublicKey.N) != 0 {
return nil, errors.New(errors.PrivateKeyError, errors.KeyMismatch)
}
case cert.PublicKeyAlgorithm == x509.ECDSA:
var ecdsaPublicKey *ecdsa.PublicKey
if ecdsaPublicKey, ok = key.Public().(*ecdsa.PublicKey); !ok {
return nil, errors.New(errors.PrivateKeyError, errors.KeyMismatch)
}
if cert.PublicKey.(*ecdsa.PublicKey).X.Cmp(ecdsaPublicKey.X) != 0 {
return nil, errors.New(errors.PrivateKeyError, errors.KeyMismatch)
}
default:
return nil, errors.New(errors.PrivateKeyError, errors.NotRSAOrECC)
}
} else {
switch {
case cert.PublicKeyAlgorithm == x509.RSA:
case cert.PublicKeyAlgorithm == x509.ECDSA:
default:
return nil, errors.New(errors.PrivateKeyError, errors.NotRSAOrECC)
}
}
if cert.CheckSignatureFrom(cert) == nil {
return nil, errors.New(errors.CertificateError, errors.SelfSigned)
}
bundle := new(Bundle)
bundle.Cert = cert
bundle.Key = key
bundle.Issuer = &cert.Issuer
bundle.Subject = &cert.Subject
bundle.buildHostnames()
// verify and store input intermediates to the intermediate pool.
// Ignore the returned error here, will treat it in the second call.
b.fetchIntermediates(certs)
chains, err := cert.Verify(b.VerifyOptions())
if err != nil {
log.Debugf("verification failed: %v", err)
// If the error was an unknown authority, try to fetch
// the intermediate specified in the AIA and add it to
// the intermediates bundle.
switch err := err.(type) {
case x509.UnknownAuthorityError:
// Do nothing -- have the default case return out.
default:
return nil, errors.Wrap(errors.CertificateError, errors.VerifyFailed, err)
}
log.Debugf("searching for intermediates via AIA issuer")
err = b.fetchIntermediates(certs)
if err != nil {
log.Debugf("search failed: %v", err)
return nil, errors.Wrap(errors.CertificateError, errors.VerifyFailed, err)
}
log.Debugf("verifying new chain")
chains, err = cert.Verify(b.VerifyOptions())
if err != nil {
log.Debugf("failed to verify chain: %v", err)
return nil, errors.Wrap(errors.CertificateError, errors.VerifyFailed, err)
}
log.Debugf("verify ok")
}
var matchingChains [][]*x509.Certificate
switch flavor {
case Optimal:
matchingChains = optimalChains(chains)
case Ubiquitous:
if len(ubiquity.Platforms) == 0 {
log.Warning("No metadata, Ubiquitous falls back to Optimal.")
}
matchingChains = ubiquitousChains(chains)
case Force:
matchingChains = forceChains(certs, chains)
default:
matchingChains = ubiquitousChains(chains)
}
bundle.Chain = matchingChains[0]
// Include at least one intermediate if the leaf has enabled OCSP and is not CA.
if bundle.Cert.OCSPServer != nil && !bundle.Cert.IsCA && len(bundle.Chain) <= 2 {
// No op. Return one intermediate if there is one.
} else {
// do not include the root.
bundle.Chain = bundle.Chain[:len(bundle.Chain)-1]
}
statusCode := int(errors.Success)
var messages []string
// Check if bundle is expiring.
expiringCerts := checkExpiringCerts(bundle.Chain)
bundle.Expires = helpers.ExpiryTime(bundle.Chain)
if len(expiringCerts) > 0 {
statusCode |= errors.BundleExpiringBit
messages = append(messages, expirationWarning(expiringCerts))
}
// Check if bundle contains SHA2 certs.
if ubiquity.ChainHashUbiquity(matchingChains[0]) <= ubiquity.SHA2Ubiquity {
statusCode |= errors.BundleNotUbiquitousBit
messages = append(messages, sha2Warning)
}
// Check if bundle contains ECDSA signatures.
if ubiquity.ChainKeyAlgoUbiquity(matchingChains[0]) <= ubiquity.ECDSA256Ubiquity {
statusCode |= errors.BundleNotUbiquitousBit
messages = append(messages, ecdsaWarning)
}
// Add root store presence info
root := matchingChains[0][len(matchingChains[0])-1]
bundle.Root = root
log.Infof("the anchoring root is %v", root.Subject)
// Check if there is any platform that doesn't trust the chain.
// Also, an warning will be generated if ubiquity.Platforms is nil,
untrusted := ubiquity.UntrustedPlatforms(root)
untrustedMsg := untrustedPlatformsWarning(untrusted)
if len(untrustedMsg) > 0 {
log.Debug("Populate untrusted platform warning.")
statusCode |= errors.BundleNotUbiquitousBit
messages = append(messages, untrustedMsg)
}
// Check if there is any platform that rejects the chain because of SHA1 deprecation.
deprecated := ubiquity.DeprecatedSHA1Platforms(matchingChains[0])
if len(deprecated) > 0 {
log.Debug("Populate SHA1 deprecation warning.")
statusCode |= errors.BundleNotUbiquitousBit
messages = append(messages, deprecateSHA1Warning(deprecated))
}
bundle.Status = &BundleStatus{ExpiringSKIs: getSKIs(bundle.Chain, expiringCerts), Code: statusCode, Messages: messages, Untrusted: untrusted}
bundle.Status.IsRebundled = diff(bundle.Chain, certs)
log.Debugf("bundle complete")
return bundle, nil
}
// fetchIntermediates goes through each of the URLs in the AIA "Issuing
// CA" extensions and fetches those certificates. If those
// certificates are not present in either the root pool or
// intermediate pool, the certificate is saved to file and added to
// the list of intermediates to be used for verification. This will
// not add any new certificates to the root pool; if the ultimate
// issuer is not trusted, fetching the certicate here will not change
// that.
func (b *Bundler) fetchIntermediates(certs []*x509.Certificate) (err error) {
log.Debugf("searching intermediates")
if _, err := os.Stat(IntermediateStash); err != nil && os.IsNotExist(err) {
log.Infof("intermediate stash directory %s doesn't exist, creating", IntermediateStash)
err = os.MkdirAll(IntermediateStash, 0755)
if err != nil {
log.Errorf("failed to create intermediate stash directory %s: %v", IntermediateStash, err)
return err
}
log.Infof("intermediate stash directory %s created", IntermediateStash)
}
// stores URLs and certificate signatures that have been seen
seen := map[string]bool{}
var foundChains int
// Construct a verify chain as a reversed partial bundle,
// such that the certs are ordered by promxity to the root CAs.
var chain []*fetchedIntermediate
for i, cert := range certs {
var name string
// Only construct filenames for non-leaf intermediate certs
// so they will be saved to disk if necessary.
// Leaf cert gets a empty name and will be skipped.
if i > 0 {
name = constructCertFileName(cert)
}
chain = append([]*fetchedIntermediate{&fetchedIntermediate{cert, name}}, chain...)
seen[string(cert.Signature)] = true
}
// Verify the chain and store valid intermediates in the chain.
// If it doesn't verify, fetch the intermediates and extend the chain
// in a DFS manner and verify each time we hit a root.
for {
if len(chain) == 0 {
log.Debugf("search complete")
if foundChains == 0 {
return x509.UnknownAuthorityError{}
}
return nil
}
current := chain[0]
var advanced bool
if b.verifyChain(chain) {
foundChains++
}
log.Debugf("walk AIA issuers")
for _, url := range current.Cert.IssuingCertificateURL {
if seen[url] {
log.Debugf("url %s has been seen", url)
continue
}
crt, err := fetchRemoteCertificate(url)
if err != nil {
continue
} else if seen[string(crt.Cert.Signature)] {
log.Debugf("fetched certificate is known")
continue
}
seen[url] = true
seen[string(crt.Cert.Signature)] = true
chain = append([]*fetchedIntermediate{crt}, chain...)
advanced = true
break
}
if !advanced {
log.Debugf("didn't advance, stepping back")
chain = chain[1:]
}
}
}