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authority.go
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authority.go
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package authority
import (
"bytes"
"context"
"crypto"
"crypto/sha256"
"crypto/x509"
"encoding/hex"
"log"
"net/http"
"strings"
"sync"
"time"
"github.com/pkg/errors"
"golang.org/x/crypto/ssh"
"go.step.sm/crypto/kms"
kmsapi "go.step.sm/crypto/kms/apiv1"
"go.step.sm/crypto/kms/sshagentkms"
"go.step.sm/crypto/pemutil"
"go.step.sm/linkedca"
"github.com/smallstep/certificates/authority/admin"
adminDBNosql "github.com/smallstep/certificates/authority/admin/db/nosql"
"github.com/smallstep/certificates/authority/administrator"
"github.com/smallstep/certificates/authority/config"
"github.com/smallstep/certificates/authority/internal/constraints"
"github.com/smallstep/certificates/authority/policy"
"github.com/smallstep/certificates/authority/provisioner"
"github.com/smallstep/certificates/cas"
casapi "github.com/smallstep/certificates/cas/apiv1"
"github.com/smallstep/certificates/db"
"github.com/smallstep/certificates/scep"
"github.com/smallstep/certificates/templates"
"github.com/smallstep/nosql"
)
// Authority implements the Certificate Authority internal interface.
type Authority struct {
config *config.Config
keyManager kms.KeyManager
provisioners *provisioner.Collection
admins *administrator.Collection
db db.AuthDB
adminDB admin.DB
templates *templates.Templates
linkedCAToken string
webhookClient *http.Client
// X509 CA
password []byte
issuerPassword []byte
x509CAService cas.CertificateAuthorityService
rootX509Certs []*x509.Certificate
rootX509CertPool *x509.CertPool
federatedX509Certs []*x509.Certificate
intermediateX509Certs []*x509.Certificate
certificates *sync.Map
x509Enforcers []provisioner.CertificateEnforcer
// SCEP CA
scepService *scep.Service
// SSH CA
sshHostPassword []byte
sshUserPassword []byte
sshCAUserCertSignKey ssh.Signer
sshCAHostCertSignKey ssh.Signer
sshCAUserCerts []ssh.PublicKey
sshCAHostCerts []ssh.PublicKey
sshCAUserFederatedCerts []ssh.PublicKey
sshCAHostFederatedCerts []ssh.PublicKey
// Do not re-initialize
initOnce bool
startTime time.Time
// Custom functions
sshBastionFunc func(ctx context.Context, user, hostname string) (*config.Bastion, error)
sshCheckHostFunc func(ctx context.Context, principal string, tok string, roots []*x509.Certificate) (bool, error)
sshGetHostsFunc func(ctx context.Context, cert *x509.Certificate) ([]config.Host, error)
getIdentityFunc provisioner.GetIdentityFunc
authorizeRenewFunc provisioner.AuthorizeRenewFunc
authorizeSSHRenewFunc provisioner.AuthorizeSSHRenewFunc
// Constraints and Policy engines
constraintsEngine *constraints.Engine
policyEngine *policy.Engine
adminMutex sync.RWMutex
// Do Not initialize the authority
skipInit bool
}
// Info contains information about the authority.
type Info struct {
StartTime time.Time
RootX509Certs []*x509.Certificate
SSHCAUserPublicKey []byte
SSHCAHostPublicKey []byte
DNSNames []string
}
// New creates and initiates a new Authority type.
func New(cfg *config.Config, opts ...Option) (*Authority, error) {
err := cfg.Validate()
if err != nil {
return nil, err
}
var a = &Authority{
config: cfg,
certificates: new(sync.Map),
}
// Apply options.
for _, fn := range opts {
if err := fn(a); err != nil {
return nil, err
}
}
if !a.skipInit {
// Initialize authority from options or configuration.
if err := a.init(); err != nil {
return nil, err
}
}
return a, nil
}
// NewEmbedded initializes an authority that can be embedded in a different
// project without the limitations of the config.
func NewEmbedded(opts ...Option) (*Authority, error) {
a := &Authority{
config: &config.Config{},
certificates: new(sync.Map),
}
// Apply options.
for _, fn := range opts {
if err := fn(a); err != nil {
return nil, err
}
}
// Validate required options
switch {
case a.config == nil:
return nil, errors.New("cannot create an authority without a configuration")
case len(a.rootX509Certs) == 0 && a.config.Root.HasEmpties():
return nil, errors.New("cannot create an authority without a root certificate")
case a.x509CAService == nil && a.config.IntermediateCert == "":
return nil, errors.New("cannot create an authority without an issuer certificate")
case a.x509CAService == nil && a.config.IntermediateKey == "":
return nil, errors.New("cannot create an authority without an issuer signer")
}
// Initialize config required fields.
a.config.Init()
if !a.skipInit {
// Initialize authority from options or configuration.
if err := a.init(); err != nil {
return nil, err
}
}
return a, nil
}
type authorityKey struct{}
// NewContext adds the given authority to the context.
func NewContext(ctx context.Context, a *Authority) context.Context {
return context.WithValue(ctx, authorityKey{}, a)
}
// FromContext returns the current authority from the given context.
func FromContext(ctx context.Context) (a *Authority, ok bool) {
a, ok = ctx.Value(authorityKey{}).(*Authority)
return
}
// MustFromContext returns the current authority from the given context. It will
// panic if the authority is not in the context.
func MustFromContext(ctx context.Context) *Authority {
if a, ok := FromContext(ctx); !ok {
panic("authority is not in the context")
} else {
return a
}
}
// ReloadAdminResources reloads admins and provisioners from the DB.
func (a *Authority) ReloadAdminResources(ctx context.Context) error {
var (
provList provisioner.List
adminList []*linkedca.Admin
)
if a.config.AuthorityConfig.EnableAdmin {
provs, err := a.adminDB.GetProvisioners(ctx)
if err != nil {
return admin.WrapErrorISE(err, "error getting provisioners to initialize authority")
}
provList, err = provisionerListToCertificates(provs)
if err != nil {
return admin.WrapErrorISE(err, "error converting provisioner list to certificates")
}
adminList, err = a.adminDB.GetAdmins(ctx)
if err != nil {
return admin.WrapErrorISE(err, "error getting admins to initialize authority")
}
} else {
provList = a.config.AuthorityConfig.Provisioners
adminList = a.config.AuthorityConfig.Admins
}
provisionerConfig, err := a.generateProvisionerConfig(ctx)
if err != nil {
return admin.WrapErrorISE(err, "error generating provisioner config")
}
// Create provisioner collection.
provClxn := provisioner.NewCollection(provisionerConfig.Audiences)
for _, p := range provList {
if err := p.Init(provisionerConfig); err != nil {
return err
}
if err := provClxn.Store(p); err != nil {
return err
}
}
// Create admin collection.
adminClxn := administrator.NewCollection(provClxn)
for _, adm := range adminList {
p, ok := provClxn.Load(adm.ProvisionerId)
if !ok {
return admin.NewErrorISE("provisioner %s not found when loading admin %s",
adm.ProvisionerId, adm.Id)
}
if err := adminClxn.Store(adm, p); err != nil {
return err
}
}
a.config.AuthorityConfig.Provisioners = provList
a.provisioners = provClxn
a.config.AuthorityConfig.Admins = adminList
a.admins = adminClxn
return nil
}
// init performs validation and initializes the fields of an Authority struct.
func (a *Authority) init() error {
// Check if handler has already been validated/initialized.
if a.initOnce {
return nil
}
var err error
ctx := NewContext(context.Background(), a)
// Set password if they are not set.
var configPassword []byte
if a.config.Password != "" {
configPassword = []byte(a.config.Password)
}
if configPassword != nil && a.password == nil {
a.password = configPassword
}
if a.sshHostPassword == nil {
a.sshHostPassword = a.password
}
if a.sshUserPassword == nil {
a.sshUserPassword = a.password
}
// Automatically enable admin for all linked cas.
if a.linkedCAToken != "" {
a.config.AuthorityConfig.EnableAdmin = true
}
// Initialize step-ca Database if it's not already initialized with WithDB.
// If a.config.DB is nil then a simple, barebones in memory DB will be used.
if a.db == nil {
if a.db, err = db.New(a.config.DB); err != nil {
return err
}
}
// Initialize key manager if it has not been set in the options.
if a.keyManager == nil {
var options kmsapi.Options
if a.config.KMS != nil {
options = *a.config.KMS
}
a.keyManager, err = kms.New(ctx, options)
if err != nil {
return err
}
}
// Initialize linkedca client if necessary. On a linked RA, the issuer
// configuration might come from majordomo.
var linkedcaClient *linkedCaClient
if a.config.AuthorityConfig.EnableAdmin && a.linkedCAToken != "" && a.adminDB == nil {
linkedcaClient, err = newLinkedCAClient(a.linkedCAToken)
if err != nil {
return err
}
// If authorityId is configured make sure it matches the one in the token
if id := a.config.AuthorityConfig.AuthorityID; id != "" && !strings.EqualFold(id, linkedcaClient.authorityID) {
return errors.New("error initializing linkedca: token authority and configured authority do not match")
}
a.config.AuthorityConfig.AuthorityID = linkedcaClient.authorityID
linkedcaClient.Run()
}
// Initialize the X.509 CA Service if it has not been set in the options.
if a.x509CAService == nil {
var options casapi.Options
if a.config.AuthorityConfig.Options != nil {
options = *a.config.AuthorityConfig.Options
}
// AuthorityID might be empty. It's always available linked CAs/RAs.
options.AuthorityID = a.config.AuthorityConfig.AuthorityID
// Configure linked RA
if linkedcaClient != nil && options.CertificateAuthority == "" {
conf, err := linkedcaClient.GetConfiguration(ctx)
if err != nil {
return err
}
if conf.RaConfig != nil {
options.CertificateAuthority = conf.RaConfig.CaUrl
options.CertificateAuthorityFingerprint = conf.RaConfig.Fingerprint
options.CertificateIssuer = &casapi.CertificateIssuer{
Type: conf.RaConfig.Provisioner.Type.String(),
Provisioner: conf.RaConfig.Provisioner.Name,
}
// Configure the RA authority type if needed
if options.Type == "" {
options.Type = casapi.StepCAS
}
}
// Remote configuration is currently only supported on a linked RA
if sc := conf.ServerConfig; sc != nil {
if a.config.Address == "" {
a.config.Address = sc.Address
}
if len(a.config.DNSNames) == 0 {
a.config.DNSNames = sc.DnsNames
}
}
}
// Set the issuer password if passed in the flags.
if options.CertificateIssuer != nil && a.issuerPassword != nil {
options.CertificateIssuer.Password = string(a.issuerPassword)
}
// Read intermediate and create X509 signer for default CAS.
if options.Is(casapi.SoftCAS) {
options.CertificateChain, err = pemutil.ReadCertificateBundle(a.config.IntermediateCert)
if err != nil {
return err
}
options.Signer, err = a.keyManager.CreateSigner(&kmsapi.CreateSignerRequest{
SigningKey: a.config.IntermediateKey,
Password: a.password,
})
if err != nil {
return err
}
// If not defined with an option, add intermediates to the list of
// certificates used for name constraints validation at issuance
// time.
if len(a.intermediateX509Certs) == 0 {
a.intermediateX509Certs = append(a.intermediateX509Certs, options.CertificateChain...)
}
}
a.x509CAService, err = cas.New(ctx, options)
if err != nil {
return err
}
// Get root certificate from CAS.
if srv, ok := a.x509CAService.(casapi.CertificateAuthorityGetter); ok {
resp, err := srv.GetCertificateAuthority(&casapi.GetCertificateAuthorityRequest{
Name: options.CertificateAuthority,
})
if err != nil {
return err
}
a.rootX509Certs = append(a.rootX509Certs, resp.RootCertificate)
}
}
// Read root certificates and store them in the certificates map.
if len(a.rootX509Certs) == 0 {
a.rootX509Certs = make([]*x509.Certificate, len(a.config.Root))
for i, path := range a.config.Root {
crt, err := pemutil.ReadCertificate(path)
if err != nil {
return err
}
a.rootX509Certs[i] = crt
}
}
for _, crt := range a.rootX509Certs {
sum := sha256.Sum256(crt.Raw)
a.certificates.Store(hex.EncodeToString(sum[:]), crt)
}
a.rootX509CertPool = x509.NewCertPool()
for _, cert := range a.rootX509Certs {
a.rootX509CertPool.AddCert(cert)
}
// Read federated certificates and store them in the certificates map.
if len(a.federatedX509Certs) == 0 {
a.federatedX509Certs = make([]*x509.Certificate, len(a.config.FederatedRoots))
for i, path := range a.config.FederatedRoots {
crt, err := pemutil.ReadCertificate(path)
if err != nil {
return err
}
a.federatedX509Certs[i] = crt
}
}
for _, crt := range a.federatedX509Certs {
sum := sha256.Sum256(crt.Raw)
a.certificates.Store(hex.EncodeToString(sum[:]), crt)
}
// Decrypt and load SSH keys
var tmplVars templates.Step
if a.config.SSH != nil {
if a.config.SSH.HostKey != "" {
signer, err := a.keyManager.CreateSigner(&kmsapi.CreateSignerRequest{
SigningKey: a.config.SSH.HostKey,
Password: a.sshHostPassword,
})
if err != nil {
return err
}
// If our signer is from sshagentkms, just unwrap it instead of
// wrapping it in another layer, and this prevents crypto from
// erroring out with: ssh: unsupported key type *agent.Key
switch s := signer.(type) {
case *sshagentkms.WrappedSSHSigner:
a.sshCAHostCertSignKey = s.Signer
case crypto.Signer:
a.sshCAHostCertSignKey, err = ssh.NewSignerFromSigner(s)
default:
return errors.Errorf("unsupported signer type %T", signer)
}
if err != nil {
return errors.Wrap(err, "error creating ssh signer")
}
// Append public key to list of host certs
a.sshCAHostCerts = append(a.sshCAHostCerts, a.sshCAHostCertSignKey.PublicKey())
a.sshCAHostFederatedCerts = append(a.sshCAHostFederatedCerts, a.sshCAHostCertSignKey.PublicKey())
}
if a.config.SSH.UserKey != "" {
signer, err := a.keyManager.CreateSigner(&kmsapi.CreateSignerRequest{
SigningKey: a.config.SSH.UserKey,
Password: a.sshUserPassword,
})
if err != nil {
return err
}
// If our signer is from sshagentkms, just unwrap it instead of
// wrapping it in another layer, and this prevents crypto from
// erroring out with: ssh: unsupported key type *agent.Key
switch s := signer.(type) {
case *sshagentkms.WrappedSSHSigner:
a.sshCAUserCertSignKey = s.Signer
case crypto.Signer:
a.sshCAUserCertSignKey, err = ssh.NewSignerFromSigner(s)
default:
return errors.Errorf("unsupported signer type %T", signer)
}
if err != nil {
return errors.Wrap(err, "error creating ssh signer")
}
// Append public key to list of user certs
a.sshCAUserCerts = append(a.sshCAUserCerts, a.sshCAUserCertSignKey.PublicKey())
a.sshCAUserFederatedCerts = append(a.sshCAUserFederatedCerts, a.sshCAUserCertSignKey.PublicKey())
}
// Append other public keys and add them to the template variables.
for _, key := range a.config.SSH.Keys {
publicKey := key.PublicKey()
switch key.Type {
case provisioner.SSHHostCert:
if key.Federated {
a.sshCAHostFederatedCerts = append(a.sshCAHostFederatedCerts, publicKey)
} else {
a.sshCAHostCerts = append(a.sshCAHostCerts, publicKey)
}
case provisioner.SSHUserCert:
if key.Federated {
a.sshCAUserFederatedCerts = append(a.sshCAUserFederatedCerts, publicKey)
} else {
a.sshCAUserCerts = append(a.sshCAUserCerts, publicKey)
}
default:
return errors.Errorf("unsupported type %s", key.Type)
}
}
}
// Configure template variables. On the template variables HostFederatedKeys
// and UserFederatedKeys we will skip the actual CA that will be available
// in HostKey and UserKey.
//
// We cannot do it in the previous blocks because this configuration can be
// injected using options.
if a.sshCAHostCertSignKey != nil {
tmplVars.SSH.HostKey = a.sshCAHostCertSignKey.PublicKey()
tmplVars.SSH.HostFederatedKeys = append(tmplVars.SSH.HostFederatedKeys, a.sshCAHostFederatedCerts[1:]...)
} else {
tmplVars.SSH.HostFederatedKeys = append(tmplVars.SSH.HostFederatedKeys, a.sshCAHostFederatedCerts...)
}
if a.sshCAUserCertSignKey != nil {
tmplVars.SSH.UserKey = a.sshCAUserCertSignKey.PublicKey()
tmplVars.SSH.UserFederatedKeys = append(tmplVars.SSH.UserFederatedKeys, a.sshCAUserFederatedCerts[1:]...)
} else {
tmplVars.SSH.UserFederatedKeys = append(tmplVars.SSH.UserFederatedKeys, a.sshCAUserFederatedCerts...)
}
// Check if a KMS with decryption capability is required and available
if a.requiresDecrypter() {
if _, ok := a.keyManager.(kmsapi.Decrypter); !ok {
return errors.New("keymanager doesn't provide crypto.Decrypter")
}
}
// TODO: decide if this is a good approach for providing the SCEP functionality
// It currently mirrors the logic for the x509CAService
if a.requiresSCEPService() && a.scepService == nil {
var options scep.Options
// Read intermediate and create X509 signer and decrypter for default CAS.
options.CertificateChain, err = pemutil.ReadCertificateBundle(a.config.IntermediateCert)
if err != nil {
return err
}
options.CertificateChain = append(options.CertificateChain, a.rootX509Certs...)
options.Signer, err = a.keyManager.CreateSigner(&kmsapi.CreateSignerRequest{
SigningKey: a.config.IntermediateKey,
Password: a.password,
})
if err != nil {
return err
}
if km, ok := a.keyManager.(kmsapi.Decrypter); ok {
options.Decrypter, err = km.CreateDecrypter(&kmsapi.CreateDecrypterRequest{
DecryptionKey: a.config.IntermediateKey,
Password: a.password,
})
if err != nil {
return err
}
}
a.scepService, err = scep.NewService(ctx, options)
if err != nil {
return err
}
// TODO: mimick the x509CAService GetCertificateAuthority here too?
}
if a.config.AuthorityConfig.EnableAdmin {
// Initialize step-ca Admin Database if it's not already initialized using
// WithAdminDB.
if a.adminDB == nil {
if linkedcaClient != nil {
a.adminDB = linkedcaClient
} else {
a.adminDB, err = adminDBNosql.New(a.db.(nosql.DB), admin.DefaultAuthorityID)
if err != nil {
return err
}
}
}
provs, err := a.adminDB.GetProvisioners(ctx)
if err != nil {
return admin.WrapErrorISE(err, "error loading provisioners to initialize authority")
}
if len(provs) == 0 && !strings.EqualFold(a.config.AuthorityConfig.DeploymentType, "linked") {
// Create First Provisioner
prov, err := CreateFirstProvisioner(ctx, a.adminDB, string(a.password))
if err != nil {
return admin.WrapErrorISE(err, "error creating first provisioner")
}
// Create first admin
if err := a.adminDB.CreateAdmin(ctx, &linkedca.Admin{
ProvisionerId: prov.Id,
Subject: "step",
Type: linkedca.Admin_SUPER_ADMIN,
}); err != nil {
return admin.WrapErrorISE(err, "error creating first admin")
}
}
}
// Load Provisioners and Admins
if err := a.ReloadAdminResources(ctx); err != nil {
return err
}
// Load X509 constraints engine.
//
// This is currently only available in CA mode.
if size := len(a.intermediateX509Certs); size > 0 {
last := a.intermediateX509Certs[size-1]
constraintCerts := make([]*x509.Certificate, 0, size+1)
constraintCerts = append(constraintCerts, a.intermediateX509Certs...)
for _, root := range a.rootX509Certs {
if bytes.Equal(last.RawIssuer, root.RawSubject) && bytes.Equal(last.AuthorityKeyId, root.SubjectKeyId) {
constraintCerts = append(constraintCerts, root)
}
}
a.constraintsEngine = constraints.New(constraintCerts...)
}
// Load x509 and SSH Policy Engines
if err := a.reloadPolicyEngines(ctx); err != nil {
return err
}
// Configure templates, currently only ssh templates are supported.
if a.sshCAHostCertSignKey != nil || a.sshCAUserCertSignKey != nil {
a.templates = a.config.Templates
if a.templates == nil {
a.templates = templates.DefaultTemplates()
}
if a.templates.Data == nil {
a.templates.Data = make(map[string]interface{})
}
a.templates.Data["Step"] = tmplVars
}
// JWT numeric dates are seconds.
a.startTime = time.Now().Truncate(time.Second)
// Set flag indicating that initialization has been completed, and should
// not be repeated.
a.initOnce = true
return nil
}
// GetID returns the define authority id or a zero uuid.
func (a *Authority) GetID() string {
const zeroUUID = "00000000-0000-0000-0000-000000000000"
if id := a.config.AuthorityConfig.AuthorityID; id != "" {
return id
}
return zeroUUID
}
// GetDatabase returns the authority database. If the configuration does not
// define a database, GetDatabase will return a db.SimpleDB instance.
func (a *Authority) GetDatabase() db.AuthDB {
return a.db
}
// GetAdminDatabase returns the admin database, if one exists.
func (a *Authority) GetAdminDatabase() admin.DB {
return a.adminDB
}
// GetConfig returns the config.
func (a *Authority) GetConfig() *config.Config {
return a.config
}
// GetInfo returns information about the authority.
func (a *Authority) GetInfo() Info {
ai := Info{
StartTime: a.startTime,
RootX509Certs: a.rootX509Certs,
DNSNames: a.config.DNSNames,
}
if a.sshCAUserCertSignKey != nil {
ai.SSHCAUserPublicKey = ssh.MarshalAuthorizedKey(a.sshCAUserCertSignKey.PublicKey())
}
if a.sshCAHostCertSignKey != nil {
ai.SSHCAHostPublicKey = ssh.MarshalAuthorizedKey(a.sshCAHostCertSignKey.PublicKey())
}
return ai
}
// IsAdminAPIEnabled returns a boolean indicating whether the Admin API has
// been enabled.
func (a *Authority) IsAdminAPIEnabled() bool {
return a.config.AuthorityConfig.EnableAdmin
}
// Shutdown safely shuts down any clients, databases, etc. held by the Authority.
func (a *Authority) Shutdown() error {
if err := a.keyManager.Close(); err != nil {
log.Printf("error closing the key manager: %v", err)
}
return a.db.Shutdown()
}
// CloseForReload closes internal services, to allow a safe reload.
func (a *Authority) CloseForReload() {
if err := a.keyManager.Close(); err != nil {
log.Printf("error closing the key manager: %v", err)
}
if client, ok := a.adminDB.(*linkedCaClient); ok {
client.Stop()
}
}
// IsRevoked returns whether or not a certificate has been
// revoked before.
func (a *Authority) IsRevoked(sn string) (bool, error) {
// Check the passive revocation table.
if lca, ok := a.adminDB.(interface {
IsRevoked(string) (bool, error)
}); ok {
return lca.IsRevoked(sn)
}
return a.db.IsRevoked(sn)
}
// requiresDecrypter returns whether the Authority
// requires a KMS that provides a crypto.Decrypter
// Currently this is only required when SCEP is
// enabled.
func (a *Authority) requiresDecrypter() bool {
return a.requiresSCEPService()
}
// requiresSCEPService iterates over the configured provisioners
// and determines if one of them is a SCEP provisioner.
func (a *Authority) requiresSCEPService() bool {
for _, p := range a.config.AuthorityConfig.Provisioners {
if p.GetType() == provisioner.TypeSCEP {
return true
}
}
return false
}
// GetSCEPService returns the configured SCEP Service
// TODO: this function is intended to exist temporarily
// in order to make SCEP work more easily. It can be
// made more correct by using the right interfaces/abstractions
// after it works as expected.
func (a *Authority) GetSCEPService() *scep.Service {
return a.scepService
}