624 lines
18 KiB
Go
624 lines
18 KiB
Go
package ca
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import (
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"bytes"
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"context"
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"crypto/tls"
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"crypto/x509"
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"fmt"
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"log"
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"net"
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"net/http"
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"net/url"
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"reflect"
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"strings"
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"sync"
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"time"
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"github.com/go-chi/chi"
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"github.com/go-chi/chi/middleware"
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"github.com/pkg/errors"
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"github.com/smallstep/certificates/acme"
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acmeAPI "github.com/smallstep/certificates/acme/api"
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acmeNoSQL "github.com/smallstep/certificates/acme/db/nosql"
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"github.com/smallstep/certificates/api"
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"github.com/smallstep/certificates/authority"
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"github.com/smallstep/certificates/authority/admin"
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adminAPI "github.com/smallstep/certificates/authority/admin/api"
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"github.com/smallstep/certificates/authority/config"
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"github.com/smallstep/certificates/db"
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"github.com/smallstep/certificates/logging"
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"github.com/smallstep/certificates/monitoring"
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"github.com/smallstep/certificates/scep"
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scepAPI "github.com/smallstep/certificates/scep/api"
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"github.com/smallstep/certificates/server"
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"github.com/smallstep/nosql"
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"go.step.sm/cli-utils/step"
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"go.step.sm/crypto/x509util"
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)
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type options struct {
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configFile string
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linkedCAToken string
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quiet bool
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password []byte
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issuerPassword []byte
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sshHostPassword []byte
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sshUserPassword []byte
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database db.AuthDB
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}
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func (o *options) apply(opts []Option) {
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for _, fn := range opts {
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fn(o)
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}
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}
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// Option is the type of options passed to the CA constructor.
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type Option func(o *options)
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// WithConfigFile sets the given name as the configuration file name in the CA
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// options.
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func WithConfigFile(name string) Option {
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return func(o *options) {
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o.configFile = name
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}
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}
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// WithPassword sets the given password as the configured password in the CA
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// options.
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func WithPassword(password []byte) Option {
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return func(o *options) {
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o.password = password
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}
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}
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// WithSSHHostPassword sets the given password to decrypt the key used to sign
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// ssh host certificates.
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func WithSSHHostPassword(password []byte) Option {
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return func(o *options) {
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o.sshHostPassword = password
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}
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}
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// WithSSHUserPassword sets the given password to decrypt the key used to sign
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// ssh user certificates.
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func WithSSHUserPassword(password []byte) Option {
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return func(o *options) {
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o.sshUserPassword = password
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}
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}
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// WithIssuerPassword sets the given password as the configured certificate
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// issuer password in the CA options.
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func WithIssuerPassword(password []byte) Option {
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return func(o *options) {
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o.issuerPassword = password
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}
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}
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// WithDatabase sets the given authority database to the CA options.
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func WithDatabase(d db.AuthDB) Option {
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return func(o *options) {
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o.database = d
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}
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}
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// WithLinkedCAToken sets the token used to authenticate with the linkedca.
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func WithLinkedCAToken(token string) Option {
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return func(o *options) {
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o.linkedCAToken = token
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}
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}
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// WithQuiet sets the quiet flag.
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func WithQuiet(quiet bool) Option {
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return func(o *options) {
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o.quiet = quiet
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}
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}
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// CA is the type used to build the complete certificate authority. It builds
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// the HTTP server, set ups the middlewares and the HTTP handlers.
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type CA struct {
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auth *authority.Authority
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config *config.Config
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srv *server.Server
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insecureSrv *server.Server
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opts *options
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renewer *TLSRenewer
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compactStop chan struct{}
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}
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// New creates and initializes the CA with the given configuration and options.
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func New(cfg *config.Config, opts ...Option) (*CA, error) {
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ca := &CA{
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config: cfg,
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opts: new(options),
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compactStop: make(chan struct{}),
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}
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ca.opts.apply(opts)
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return ca.Init(cfg)
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}
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// Init initializes the CA with the given configuration.
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func (ca *CA) Init(cfg *config.Config) (*CA, error) {
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// Set password, it's ok to set nil password, the ca will prompt for them if
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// they are required.
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opts := []authority.Option{
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authority.WithPassword(ca.opts.password),
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authority.WithSSHHostPassword(ca.opts.sshHostPassword),
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authority.WithSSHUserPassword(ca.opts.sshUserPassword),
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authority.WithIssuerPassword(ca.opts.issuerPassword),
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}
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if ca.opts.linkedCAToken != "" {
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opts = append(opts, authority.WithLinkedCAToken(ca.opts.linkedCAToken))
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}
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if ca.opts.database != nil {
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opts = append(opts, authority.WithDatabase(ca.opts.database))
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}
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if ca.opts.quiet {
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opts = append(opts, authority.WithQuietInit())
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}
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webhookTransport := http.DefaultTransport.(*http.Transport).Clone()
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opts = append(opts, authority.WithWebhookClient(&http.Client{Transport: webhookTransport}))
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auth, err := authority.New(cfg, opts...)
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if err != nil {
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return nil, err
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}
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ca.auth = auth
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tlsConfig, clientTLSConfig, err := ca.getTLSConfig(auth)
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if err != nil {
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return nil, err
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}
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webhookTransport.TLSClientConfig = clientTLSConfig
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// Using chi as the main router
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mux := chi.NewRouter()
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handler := http.Handler(mux)
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insecureMux := chi.NewRouter()
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insecureHandler := http.Handler(insecureMux)
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// Add HEAD middleware
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mux.Use(middleware.GetHead)
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insecureMux.Use(middleware.GetHead)
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// Add regular CA api endpoints in / and /1.0
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api.Route(mux)
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mux.Route("/1.0", func(r chi.Router) {
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api.Route(r)
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})
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//Add ACME api endpoints in /acme and /1.0/acme
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dns := cfg.DNSNames[0]
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u, err := url.Parse("https://" + cfg.Address)
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if err != nil {
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return nil, err
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}
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port := u.Port()
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if port != "" && port != "443" {
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dns = fmt.Sprintf("%s:%s", dns, port)
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}
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// ACME Router is only available if we have a database.
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var acmeDB acme.DB
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var acmeLinker acme.Linker
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if cfg.DB != nil {
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acmeDB, err = acmeNoSQL.New(auth.GetDatabase().(nosql.DB))
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if err != nil {
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return nil, errors.Wrap(err, "error configuring ACME DB interface")
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}
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acmeLinker = acme.NewLinker(dns, "acme")
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mux.Route("/acme", func(r chi.Router) {
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acmeAPI.Route(r)
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})
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// Use 2.0 because, at the moment, our ACME api is only compatible with v2.0
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// of the ACME spec.
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mux.Route("/2.0/acme", func(r chi.Router) {
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acmeAPI.Route(r)
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})
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}
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// Admin API Router
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if cfg.AuthorityConfig.EnableAdmin {
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adminDB := auth.GetAdminDatabase()
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if adminDB != nil {
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acmeAdminResponder := adminAPI.NewACMEAdminResponder()
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policyAdminResponder := adminAPI.NewPolicyAdminResponder()
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webhookAdminResponder := adminAPI.NewWebhookAdminResponder()
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mux.Route("/admin", func(r chi.Router) {
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adminAPI.Route(
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r,
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adminAPI.WithACMEResponder(acmeAdminResponder),
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adminAPI.WithPolicyResponder(policyAdminResponder),
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adminAPI.WithWebhookResponder(webhookAdminResponder),
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)
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})
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}
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}
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var scepAuthority *scep.Authority
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if ca.shouldServeSCEPEndpoints() {
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scepPrefix := "scep"
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scepAuthority, err = scep.New(auth, scep.AuthorityOptions{
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Service: auth.GetSCEPService(),
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DNS: dns,
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Prefix: scepPrefix,
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})
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if err != nil {
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return nil, errors.Wrap(err, "error creating SCEP authority")
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}
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// According to the RFC (https://tools.ietf.org/html/rfc8894#section-7.10),
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// SCEP operations are performed using HTTP, so that's why the API is mounted
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// to the insecure mux.
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insecureMux.Route("/"+scepPrefix, func(r chi.Router) {
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scepAPI.Route(r)
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})
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// The RFC also mentions usage of HTTPS, but seems to advise
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// against it, because of potential interoperability issues.
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// Currently I think it's not bad to use HTTPS also, so that's
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// why I've kept the API endpoints in both muxes and both HTTP
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// as well as HTTPS can be used to request certificates
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// using SCEP.
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mux.Route("/"+scepPrefix, func(r chi.Router) {
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scepAPI.Route(r)
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})
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}
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// helpful routine for logging all routes
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//dumpRoutes(mux)
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// Add monitoring if configured
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if len(cfg.Monitoring) > 0 {
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m, err := monitoring.New(cfg.Monitoring)
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if err != nil {
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return nil, err
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}
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handler = m.Middleware(handler)
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insecureHandler = m.Middleware(insecureHandler)
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}
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// Add logger if configured
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if len(cfg.Logger) > 0 {
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logger, err := logging.New("ca", cfg.Logger)
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if err != nil {
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return nil, err
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}
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handler = logger.Middleware(handler)
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insecureHandler = logger.Middleware(insecureHandler)
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}
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// Create context with all the necessary values.
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baseContext := buildContext(auth, scepAuthority, acmeDB, acmeLinker)
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ca.srv = server.New(cfg.Address, handler, tlsConfig)
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ca.srv.BaseContext = func(net.Listener) context.Context {
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return baseContext
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}
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// only start the insecure server if the insecure address is configured
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// and, currently, also only when it should serve SCEP endpoints.
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if ca.shouldServeSCEPEndpoints() && cfg.InsecureAddress != "" {
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// TODO: instead opt for having a single server.Server but two
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// http.Servers handling the HTTP and HTTPS handler? The latter
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// will probably introduce more complexity in terms of graceful
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// reload.
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ca.insecureSrv = server.New(cfg.InsecureAddress, insecureHandler, nil)
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ca.insecureSrv.BaseContext = func(net.Listener) context.Context {
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return baseContext
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}
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}
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return ca, nil
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}
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// buildContext builds the server base context.
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func buildContext(a *authority.Authority, scepAuthority *scep.Authority, acmeDB acme.DB, acmeLinker acme.Linker) context.Context {
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ctx := authority.NewContext(context.Background(), a)
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if authDB := a.GetDatabase(); authDB != nil {
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ctx = db.NewContext(ctx, authDB)
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}
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if adminDB := a.GetAdminDatabase(); adminDB != nil {
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ctx = admin.NewContext(ctx, adminDB)
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}
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if scepAuthority != nil {
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ctx = scep.NewContext(ctx, scepAuthority)
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}
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if acmeDB != nil {
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ctx = acme.NewContext(ctx, acmeDB, acme.NewClient(), acmeLinker, nil)
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}
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return ctx
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}
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// Run starts the CA calling to the server ListenAndServe method.
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func (ca *CA) Run() error {
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var wg sync.WaitGroup
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errs := make(chan error, 1)
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if !ca.opts.quiet {
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authorityInfo := ca.auth.GetInfo()
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log.Printf("Starting %s", step.Version())
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log.Printf("Documentation: https://u.step.sm/docs/ca")
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log.Printf("Community Discord: https://u.step.sm/discord")
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if step.Contexts().GetCurrent() != nil {
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log.Printf("Current context: %s", step.Contexts().GetCurrent().Name)
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}
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log.Printf("Config file: %s", ca.getConfigFileOutput())
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baseURL := fmt.Sprintf("https://%s%s",
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authorityInfo.DNSNames[0],
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ca.config.Address[strings.LastIndex(ca.config.Address, ":"):])
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log.Printf("The primary server URL is %s", baseURL)
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log.Printf("Root certificates are available at %s/roots.pem", baseURL)
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if len(authorityInfo.DNSNames) > 1 {
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log.Printf("Additional configured hostnames: %s",
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strings.Join(authorityInfo.DNSNames[1:], ", "))
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}
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for _, crt := range authorityInfo.RootX509Certs {
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log.Printf("X.509 Root Fingerprint: %s", x509util.Fingerprint(crt))
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}
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if authorityInfo.SSHCAHostPublicKey != nil {
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log.Printf("SSH Host CA Key: %s\n", bytes.TrimSpace(authorityInfo.SSHCAHostPublicKey))
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}
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if authorityInfo.SSHCAUserPublicKey != nil {
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log.Printf("SSH User CA Key: %s\n", bytes.TrimSpace(authorityInfo.SSHCAUserPublicKey))
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}
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}
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wg.Add(1)
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go func() {
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defer wg.Done()
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ca.runCompactJob()
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}()
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if ca.insecureSrv != nil {
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wg.Add(1)
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go func() {
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defer wg.Done()
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errs <- ca.insecureSrv.ListenAndServe()
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}()
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}
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wg.Add(1)
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go func() {
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defer wg.Done()
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errs <- ca.srv.ListenAndServe()
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}()
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// wait till error occurs; ensures the servers keep listening
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err := <-errs
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wg.Wait()
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return err
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}
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// Stop stops the CA calling to the server Shutdown method.
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func (ca *CA) Stop() error {
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close(ca.compactStop)
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ca.renewer.Stop()
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if err := ca.auth.Shutdown(); err != nil {
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log.Printf("error stopping ca.Authority: %+v\n", err)
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}
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var insecureShutdownErr error
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if ca.insecureSrv != nil {
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insecureShutdownErr = ca.insecureSrv.Shutdown()
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}
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secureErr := ca.srv.Shutdown()
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if insecureShutdownErr != nil {
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return insecureShutdownErr
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}
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return secureErr
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}
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// Reload reloads the configuration of the CA and calls to the server Reload
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// method.
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func (ca *CA) Reload() error {
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cfg, err := config.LoadConfiguration(ca.opts.configFile)
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if err != nil {
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return errors.Wrap(err, "error reloading ca configuration")
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}
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logContinue := func(reason string) {
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log.Println(reason)
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log.Println("Continuing to run with the original configuration.")
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log.Println("You can force a restart by sending a SIGTERM signal and then restarting the step-ca.")
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}
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// Do not allow reload if the database configuration has changed.
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if !reflect.DeepEqual(ca.config.DB, cfg.DB) {
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logContinue("Reload failed because the database configuration has changed.")
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return errors.New("error reloading ca: database configuration cannot change")
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}
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newCA, err := New(cfg,
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WithPassword(ca.opts.password),
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WithSSHHostPassword(ca.opts.sshHostPassword),
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WithSSHUserPassword(ca.opts.sshUserPassword),
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WithIssuerPassword(ca.opts.issuerPassword),
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WithLinkedCAToken(ca.opts.linkedCAToken),
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WithQuiet(ca.opts.quiet),
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WithConfigFile(ca.opts.configFile),
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WithDatabase(ca.auth.GetDatabase()),
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)
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if err != nil {
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logContinue("Reload failed because the CA with new configuration could not be initialized.")
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return errors.Wrap(err, "error reloading ca")
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}
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if ca.insecureSrv != nil {
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if err = ca.insecureSrv.Reload(newCA.insecureSrv); err != nil {
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logContinue("Reload failed because insecure server could not be replaced.")
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return errors.Wrap(err, "error reloading insecure server")
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}
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}
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if err = ca.srv.Reload(newCA.srv); err != nil {
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logContinue("Reload failed because server could not be replaced.")
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return errors.Wrap(err, "error reloading server")
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}
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// 1. Stop previous renewer
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// 2. Safely shutdown any internal resources (e.g. key manager)
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// 3. Replace ca properties
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// Do not replace ca.srv
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ca.renewer.Stop()
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ca.auth.CloseForReload()
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ca.auth = newCA.auth
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ca.config = newCA.config
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ca.opts = newCA.opts
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ca.renewer = newCA.renewer
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return nil
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}
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// get TLSConfig returns separate TLSConfigs for server and client with the
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// same self-renewing certificate.
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func (ca *CA) getTLSConfig(auth *authority.Authority) (*tls.Config, *tls.Config, error) {
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// Create initial TLS certificate
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tlsCrt, err := auth.GetTLSCertificate()
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if err != nil {
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return nil, nil, err
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}
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// Start tls renewer with the new certificate.
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// If a renewer was started, attempt to stop it before.
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if ca.renewer != nil {
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ca.renewer.Stop()
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}
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ca.renewer, err = NewTLSRenewer(tlsCrt, auth.GetTLSCertificate)
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if err != nil {
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return nil, nil, err
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}
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ca.renewer.Run()
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var serverTLSConfig *tls.Config
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if ca.config.TLS != nil {
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serverTLSConfig = ca.config.TLS.TLSConfig()
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} else {
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serverTLSConfig = &tls.Config{
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MinVersion: tls.VersionTLS12,
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}
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}
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// GetCertificate will only be called if the client supplies SNI
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// information or if tlsConfig.Certificates is empty.
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// When client requests are made using an IP address (as opposed to a domain
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// name) the server does not receive any SNI and may fallback to using the
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// first entry in the Certificates attribute; by setting the attribute to
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// empty we are implicitly forcing GetCertificate to be the only mechanism
|
|
// by which the server can find it's own leaf Certificate.
|
|
serverTLSConfig.Certificates = []tls.Certificate{}
|
|
|
|
clientTLSConfig := serverTLSConfig.Clone()
|
|
|
|
serverTLSConfig.GetCertificate = ca.renewer.GetCertificateForCA
|
|
clientTLSConfig.GetClientCertificate = ca.renewer.GetClientCertificate
|
|
|
|
// initialize a certificate pool with root CA certificates to trust when doing mTLS.
|
|
certPool := x509.NewCertPool()
|
|
// initialize a certificate pool with root CA certificates to trust when connecting
|
|
// to webhook servers
|
|
rootCAsPool, err := x509.SystemCertPool()
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
for _, crt := range auth.GetRootCertificates() {
|
|
certPool.AddCert(crt)
|
|
rootCAsPool.AddCert(crt)
|
|
}
|
|
|
|
// adding the intermediate CA certificates to the pool will allow clients that
|
|
// do mTLS but don't send an intermediate to successfully connect. The intermediates
|
|
// added here are used when building a certificate chain.
|
|
intermediates := tlsCrt.Certificate[1:]
|
|
for _, certBytes := range intermediates {
|
|
cert, err := x509.ParseCertificate(certBytes)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
certPool.AddCert(cert)
|
|
rootCAsPool.AddCert(cert)
|
|
}
|
|
|
|
// Add support for mutual tls to renew certificates
|
|
serverTLSConfig.ClientAuth = tls.VerifyClientCertIfGiven
|
|
serverTLSConfig.ClientCAs = certPool
|
|
|
|
clientTLSConfig.RootCAs = rootCAsPool
|
|
|
|
return serverTLSConfig, clientTLSConfig, nil
|
|
}
|
|
|
|
// shouldServeSCEPEndpoints returns if the CA should be
|
|
// configured with endpoints for SCEP. This is assumed to be
|
|
// true if a SCEPService exists, which is true in case a
|
|
// SCEP provisioner was configured.
|
|
func (ca *CA) shouldServeSCEPEndpoints() bool {
|
|
return ca.auth.GetSCEPService() != nil
|
|
}
|
|
|
|
//nolint:unused // useful for debugging
|
|
func dumpRoutes(mux chi.Routes) {
|
|
// helpful routine for logging all routes
|
|
walkFunc := func(method string, route string, handler http.Handler, middlewares ...func(http.Handler) http.Handler) error {
|
|
fmt.Printf("%s %s\n", method, route)
|
|
return nil
|
|
}
|
|
if err := chi.Walk(mux, walkFunc); err != nil {
|
|
fmt.Printf("Logging err: %s\n", err.Error())
|
|
}
|
|
}
|
|
|
|
func (ca *CA) getConfigFileOutput() string {
|
|
if ca.config.WasLoadedFromFile() {
|
|
return ca.config.Filepath()
|
|
}
|
|
return "loaded from token"
|
|
}
|
|
|
|
// runCompactJob will run the value log garbage collector if the nosql database
|
|
// supports it.
|
|
func (ca *CA) runCompactJob() {
|
|
caDB, ok := ca.auth.GetDatabase().(*db.DB)
|
|
if !ok {
|
|
return
|
|
}
|
|
compactor, ok := caDB.DB.(nosql.Compactor)
|
|
if !ok {
|
|
return
|
|
}
|
|
|
|
// Compact database at start.
|
|
runCompact(compactor)
|
|
|
|
// Compact database every minute.
|
|
ticker := time.NewTicker(time.Minute)
|
|
defer ticker.Stop()
|
|
|
|
for {
|
|
select {
|
|
case <-ca.compactStop:
|
|
return
|
|
case <-ticker.C:
|
|
runCompact(compactor)
|
|
}
|
|
}
|
|
}
|
|
|
|
// runCompact executes the compact job until it returns an error.
|
|
func runCompact(c nosql.Compactor) {
|
|
for err := error(nil); err == nil; {
|
|
err = c.Compact(0.7)
|
|
}
|
|
}
|