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618 lines
19 KiB
Go
618 lines
19 KiB
Go
package authority
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import (
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"context"
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"crypto"
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"crypto/sha256"
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"crypto/x509"
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"encoding/hex"
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"log"
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"strings"
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"sync"
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"time"
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"github.com/pkg/errors"
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"github.com/smallstep/certificates/authority/admin"
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adminDBNosql "github.com/smallstep/certificates/authority/admin/db/nosql"
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"github.com/smallstep/certificates/authority/administrator"
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"github.com/smallstep/certificates/authority/config"
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"github.com/smallstep/certificates/authority/provisioner"
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"github.com/smallstep/certificates/cas"
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casapi "github.com/smallstep/certificates/cas/apiv1"
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"github.com/smallstep/certificates/db"
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"github.com/smallstep/certificates/kms"
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kmsapi "github.com/smallstep/certificates/kms/apiv1"
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"github.com/smallstep/certificates/kms/sshagentkms"
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"github.com/smallstep/certificates/scep"
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"github.com/smallstep/certificates/templates"
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"github.com/smallstep/nosql"
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"go.step.sm/crypto/pemutil"
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"go.step.sm/linkedca"
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"golang.org/x/crypto/ssh"
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)
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// Authority implements the Certificate Authority internal interface.
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type Authority struct {
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config *config.Config
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keyManager kms.KeyManager
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provisioners *provisioner.Collection
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admins *administrator.Collection
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db db.AuthDB
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adminDB admin.DB
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templates *templates.Templates
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linkedCAToken string
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// X509 CA
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password []byte
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issuerPassword []byte
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x509CAService cas.CertificateAuthorityService
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rootX509Certs []*x509.Certificate
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rootX509CertPool *x509.CertPool
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federatedX509Certs []*x509.Certificate
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certificates *sync.Map
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// SCEP CA
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scepService *scep.Service
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// SSH CA
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sshHostPassword []byte
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sshUserPassword []byte
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sshCAUserCertSignKey ssh.Signer
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sshCAHostCertSignKey ssh.Signer
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sshCAUserCerts []ssh.PublicKey
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sshCAHostCerts []ssh.PublicKey
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sshCAUserFederatedCerts []ssh.PublicKey
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sshCAHostFederatedCerts []ssh.PublicKey
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// Do not re-initialize
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initOnce bool
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startTime time.Time
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// Custom functions
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sshBastionFunc func(ctx context.Context, user, hostname string) (*config.Bastion, error)
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sshCheckHostFunc func(ctx context.Context, principal string, tok string, roots []*x509.Certificate) (bool, error)
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sshGetHostsFunc func(ctx context.Context, cert *x509.Certificate) ([]config.Host, error)
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getIdentityFunc provisioner.GetIdentityFunc
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adminMutex sync.RWMutex
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}
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// New creates and initiates a new Authority type.
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func New(config *config.Config, opts ...Option) (*Authority, error) {
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err := config.Validate()
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if err != nil {
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return nil, err
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}
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var a = &Authority{
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config: config,
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certificates: new(sync.Map),
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}
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// Apply options.
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for _, fn := range opts {
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if err := fn(a); err != nil {
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return nil, err
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}
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}
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// Initialize authority from options or configuration.
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if err := a.init(); err != nil {
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return nil, err
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}
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return a, nil
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}
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// NewEmbedded initializes an authority that can be embedded in a different
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// project without the limitations of the config.
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func NewEmbedded(opts ...Option) (*Authority, error) {
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a := &Authority{
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config: &config.Config{},
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certificates: new(sync.Map),
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}
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// Apply options.
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for _, fn := range opts {
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if err := fn(a); err != nil {
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return nil, err
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}
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}
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// Validate required options
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switch {
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case a.config == nil:
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return nil, errors.New("cannot create an authority without a configuration")
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case len(a.rootX509Certs) == 0 && a.config.Root.HasEmpties():
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return nil, errors.New("cannot create an authority without a root certificate")
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case a.x509CAService == nil && a.config.IntermediateCert == "":
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return nil, errors.New("cannot create an authority without an issuer certificate")
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case a.x509CAService == nil && a.config.IntermediateKey == "":
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return nil, errors.New("cannot create an authority without an issuer signer")
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}
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// Initialize config required fields.
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a.config.Init()
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// Initialize authority from options or configuration.
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if err := a.init(); err != nil {
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return nil, err
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}
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return a, nil
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}
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// reloadAdminResources reloads admins and provisioners from the DB.
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func (a *Authority) reloadAdminResources(ctx context.Context) error {
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var (
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provList provisioner.List
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adminList []*linkedca.Admin
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)
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if a.config.AuthorityConfig.EnableAdmin {
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provs, err := a.adminDB.GetProvisioners(ctx)
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if err != nil {
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return admin.WrapErrorISE(err, "error getting provisioners to initialize authority")
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}
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provList, err = provisionerListToCertificates(provs)
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if err != nil {
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return admin.WrapErrorISE(err, "error converting provisioner list to certificates")
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}
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adminList, err = a.adminDB.GetAdmins(ctx)
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if err != nil {
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return admin.WrapErrorISE(err, "error getting admins to initialize authority")
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}
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} else {
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provList = a.config.AuthorityConfig.Provisioners
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adminList = a.config.AuthorityConfig.Admins
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}
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provisionerConfig, err := a.generateProvisionerConfig(ctx)
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if err != nil {
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return admin.WrapErrorISE(err, "error generating provisioner config")
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}
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// Create provisioner collection.
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provClxn := provisioner.NewCollection(provisionerConfig.Audiences)
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for _, p := range provList {
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if err := p.Init(*provisionerConfig); err != nil {
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return err
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}
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if err := provClxn.Store(p); err != nil {
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return err
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}
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}
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// Create admin collection.
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adminClxn := administrator.NewCollection(provClxn)
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for _, adm := range adminList {
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p, ok := provClxn.Load(adm.ProvisionerId)
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if !ok {
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return admin.NewErrorISE("provisioner %s not found when loading admin %s",
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adm.ProvisionerId, adm.Id)
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}
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if err := adminClxn.Store(adm, p); err != nil {
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return err
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}
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}
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a.config.AuthorityConfig.Provisioners = provList
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a.provisioners = provClxn
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a.config.AuthorityConfig.Admins = adminList
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a.admins = adminClxn
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return nil
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}
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// init performs validation and initializes the fields of an Authority struct.
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func (a *Authority) init() error {
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// Check if handler has already been validated/initialized.
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if a.initOnce {
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return nil
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}
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var err error
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// Set password if they are not set.
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var configPassword []byte
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if a.config.Password != "" {
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configPassword = []byte(a.config.Password)
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}
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if configPassword != nil && a.password == nil {
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a.password = configPassword
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}
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if a.sshHostPassword == nil {
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a.sshHostPassword = a.password
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}
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if a.sshUserPassword == nil {
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a.sshUserPassword = a.password
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}
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// Automatically enable admin for all linked cas.
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if a.linkedCAToken != "" {
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a.config.AuthorityConfig.EnableAdmin = true
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}
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// Initialize step-ca Database if it's not already initialized with WithDB.
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// If a.config.DB is nil then a simple, barebones in memory DB will be used.
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if a.db == nil {
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if a.db, err = db.New(a.config.DB); err != nil {
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return err
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}
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}
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// Initialize key manager if it has not been set in the options.
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if a.keyManager == nil {
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var options kmsapi.Options
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if a.config.KMS != nil {
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options = *a.config.KMS
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}
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a.keyManager, err = kms.New(context.Background(), options)
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if err != nil {
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return err
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}
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}
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// Initialize the X.509 CA Service if it has not been set in the options.
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if a.x509CAService == nil {
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var options casapi.Options
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if a.config.AuthorityConfig.Options != nil {
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options = *a.config.AuthorityConfig.Options
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}
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// Set the issuer password if passed in the flags.
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if options.CertificateIssuer != nil && a.issuerPassword != nil {
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options.CertificateIssuer.Password = string(a.issuerPassword)
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}
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// Read intermediate and create X509 signer for default CAS.
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if options.Is(casapi.SoftCAS) {
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options.CertificateChain, err = pemutil.ReadCertificateBundle(a.config.IntermediateCert)
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if err != nil {
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return err
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}
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options.Signer, err = a.keyManager.CreateSigner(&kmsapi.CreateSignerRequest{
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SigningKey: a.config.IntermediateKey,
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Password: []byte(a.password),
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})
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if err != nil {
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return err
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}
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}
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a.x509CAService, err = cas.New(context.Background(), options)
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if err != nil {
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return err
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}
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// Get root certificate from CAS.
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if srv, ok := a.x509CAService.(casapi.CertificateAuthorityGetter); ok {
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resp, err := srv.GetCertificateAuthority(&casapi.GetCertificateAuthorityRequest{
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Name: options.CertificateAuthority,
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})
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if err != nil {
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return err
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}
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a.rootX509Certs = append(a.rootX509Certs, resp.RootCertificate)
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sum := sha256.Sum256(resp.RootCertificate.Raw)
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log.Printf("Using root fingerprint '%s'", hex.EncodeToString(sum[:]))
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}
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}
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// Read root certificates and store them in the certificates map.
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if len(a.rootX509Certs) == 0 {
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a.rootX509Certs = make([]*x509.Certificate, len(a.config.Root))
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for i, path := range a.config.Root {
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crt, err := pemutil.ReadCertificate(path)
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if err != nil {
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return err
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}
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a.rootX509Certs[i] = crt
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}
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}
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for _, crt := range a.rootX509Certs {
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sum := sha256.Sum256(crt.Raw)
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a.certificates.Store(hex.EncodeToString(sum[:]), crt)
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}
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a.rootX509CertPool = x509.NewCertPool()
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for _, cert := range a.rootX509Certs {
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a.rootX509CertPool.AddCert(cert)
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}
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// Read federated certificates and store them in the certificates map.
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if len(a.federatedX509Certs) == 0 {
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a.federatedX509Certs = make([]*x509.Certificate, len(a.config.FederatedRoots))
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for i, path := range a.config.FederatedRoots {
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crt, err := pemutil.ReadCertificate(path)
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if err != nil {
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return err
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}
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a.federatedX509Certs[i] = crt
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}
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}
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for _, crt := range a.federatedX509Certs {
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sum := sha256.Sum256(crt.Raw)
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a.certificates.Store(hex.EncodeToString(sum[:]), crt)
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}
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// Decrypt and load SSH keys
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var tmplVars templates.Step
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if a.config.SSH != nil {
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if a.config.SSH.HostKey != "" {
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signer, err := a.keyManager.CreateSigner(&kmsapi.CreateSignerRequest{
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SigningKey: a.config.SSH.HostKey,
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Password: []byte(a.sshHostPassword),
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})
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if err != nil {
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return err
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}
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// If our signer is from sshagentkms, just unwrap it instead of
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// wrapping it in another layer, and this prevents crypto from
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// erroring out with: ssh: unsupported key type *agent.Key
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switch s := signer.(type) {
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case *sshagentkms.WrappedSSHSigner:
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a.sshCAHostCertSignKey = s.Sshsigner
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case crypto.Signer:
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a.sshCAHostCertSignKey, err = ssh.NewSignerFromSigner(s)
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default:
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return errors.Errorf("unsupported signer type %T", signer)
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}
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if err != nil {
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return errors.Wrap(err, "error creating ssh signer")
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}
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// Append public key to list of host certs
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a.sshCAHostCerts = append(a.sshCAHostCerts, a.sshCAHostCertSignKey.PublicKey())
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a.sshCAHostFederatedCerts = append(a.sshCAHostFederatedCerts, a.sshCAHostCertSignKey.PublicKey())
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}
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if a.config.SSH.UserKey != "" {
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signer, err := a.keyManager.CreateSigner(&kmsapi.CreateSignerRequest{
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SigningKey: a.config.SSH.UserKey,
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Password: []byte(a.sshUserPassword),
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})
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if err != nil {
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return err
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}
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// If our signer is from sshagentkms, just unwrap it instead of
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// wrapping it in another layer, and this prevents crypto from
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// erroring out with: ssh: unsupported key type *agent.Key
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switch s := signer.(type) {
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case *sshagentkms.WrappedSSHSigner:
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a.sshCAUserCertSignKey = s.Sshsigner
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case crypto.Signer:
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a.sshCAUserCertSignKey, err = ssh.NewSignerFromSigner(s)
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default:
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return errors.Errorf("unsupported signer type %T", signer)
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}
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if err != nil {
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return errors.Wrap(err, "error creating ssh signer")
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}
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// Append public key to list of user certs
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a.sshCAUserCerts = append(a.sshCAUserCerts, a.sshCAUserCertSignKey.PublicKey())
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a.sshCAUserFederatedCerts = append(a.sshCAUserFederatedCerts, a.sshCAUserCertSignKey.PublicKey())
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}
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// Append other public keys and add them to the template variables.
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for _, key := range a.config.SSH.Keys {
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publicKey := key.PublicKey()
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switch key.Type {
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case provisioner.SSHHostCert:
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if key.Federated {
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a.sshCAHostFederatedCerts = append(a.sshCAHostFederatedCerts, publicKey)
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} else {
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a.sshCAHostCerts = append(a.sshCAHostCerts, publicKey)
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}
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case provisioner.SSHUserCert:
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if key.Federated {
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a.sshCAUserFederatedCerts = append(a.sshCAUserFederatedCerts, publicKey)
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} else {
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a.sshCAUserCerts = append(a.sshCAUserCerts, publicKey)
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}
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default:
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return errors.Errorf("unsupported type %s", key.Type)
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}
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}
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}
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// Configure template variables. On the template variables HostFederatedKeys
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// and UserFederatedKeys we will skip the actual CA that will be available
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// in HostKey and UserKey.
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//
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// We cannot do it in the previous blocks because this configuration can be
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// injected using options.
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if a.sshCAHostCertSignKey != nil {
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tmplVars.SSH.HostKey = a.sshCAHostCertSignKey.PublicKey()
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tmplVars.SSH.HostFederatedKeys = append(tmplVars.SSH.HostFederatedKeys, a.sshCAHostFederatedCerts[1:]...)
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} else {
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tmplVars.SSH.HostFederatedKeys = append(tmplVars.SSH.HostFederatedKeys, a.sshCAHostFederatedCerts...)
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}
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if a.sshCAUserCertSignKey != nil {
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tmplVars.SSH.UserKey = a.sshCAUserCertSignKey.PublicKey()
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tmplVars.SSH.UserFederatedKeys = append(tmplVars.SSH.UserFederatedKeys, a.sshCAUserFederatedCerts[1:]...)
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} else {
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tmplVars.SSH.UserFederatedKeys = append(tmplVars.SSH.UserFederatedKeys, a.sshCAUserFederatedCerts...)
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}
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// Check if a KMS with decryption capability is required and available
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if a.requiresDecrypter() {
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if _, ok := a.keyManager.(kmsapi.Decrypter); !ok {
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return errors.New("keymanager doesn't provide crypto.Decrypter")
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}
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}
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// Check if a KMS with decryption capability is required and available
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if a.requiresDecrypter() {
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if _, ok := a.keyManager.(kmsapi.Decrypter); !ok {
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return errors.New("keymanager doesn't provide crypto.Decrypter")
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}
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}
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// TODO: decide if this is a good approach for providing the SCEP functionality
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// It currently mirrors the logic for the x509CAService
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if a.requiresSCEPService() && a.scepService == nil {
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var options scep.Options
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// Read intermediate and create X509 signer and decrypter for default CAS.
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options.CertificateChain, err = pemutil.ReadCertificateBundle(a.config.IntermediateCert)
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if err != nil {
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return err
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}
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options.Signer, err = a.keyManager.CreateSigner(&kmsapi.CreateSignerRequest{
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SigningKey: a.config.IntermediateKey,
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Password: []byte(a.password),
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})
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if err != nil {
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return err
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}
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if km, ok := a.keyManager.(kmsapi.Decrypter); ok {
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options.Decrypter, err = km.CreateDecrypter(&kmsapi.CreateDecrypterRequest{
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DecryptionKey: a.config.IntermediateKey,
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Password: []byte(a.password),
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})
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if err != nil {
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return err
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}
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}
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a.scepService, err = scep.NewService(context.Background(), options)
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if err != nil {
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return err
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}
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// TODO: mimick the x509CAService GetCertificateAuthority here too?
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}
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|
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if a.config.AuthorityConfig.EnableAdmin {
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// Initialize step-ca Admin Database if it's not already initialized using
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// WithAdminDB.
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if a.adminDB == nil {
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if a.linkedCAToken == "" {
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// Check if AuthConfig already exists
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a.adminDB, err = adminDBNosql.New(a.db.(nosql.DB), admin.DefaultAuthorityID)
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if err != nil {
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return err
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}
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} else {
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// Use the linkedca client as the admindb.
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client, err := newLinkedCAClient(a.linkedCAToken)
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if err != nil {
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return err
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}
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// If authorityId is configured make sure it matches the one in the token
|
|
if id := a.config.AuthorityConfig.AuthorityID; id != "" && !strings.EqualFold(id, client.authorityID) {
|
|
return errors.New("error initializing linkedca: token authority and configured authority do not match")
|
|
}
|
|
client.Run()
|
|
a.adminDB = client
|
|
}
|
|
}
|
|
|
|
provs, err := a.adminDB.GetProvisioners(context.Background())
|
|
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(context.Background(), a.adminDB, string(a.password))
|
|
if err != nil {
|
|
return admin.WrapErrorISE(err, "error creating first provisioner")
|
|
}
|
|
|
|
// Create first admin
|
|
if err := a.adminDB.CreateAdmin(context.Background(), &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(context.Background()); 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
|
|
}
|
|
|
|
// 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
|
|
}
|
|
|
|
// 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()
|
|
}
|
|
}
|
|
|
|
// 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
|
|
}
|