change func def for getSSHHosts

* continue to return all hosts if injection method not specified

api/ssh.go

@@ -2,6 +2,7 @@ package api
 
 import (
 	"context"
+	"crypto/x509"
 	"encoding/base64"
 	"encoding/json"
 	"net/http"
@@ -23,7 +24,7 @@ type SSHAuthority interface {
 	GetSSHFederation() (*authority.SSHKeys, error)
 	GetSSHConfig(typ string, data map[string]string) ([]templates.Output, error)
 	CheckSSHHost(principal string) (bool, error)
-	GetSSHHosts(user string) ([]string, error)
+	GetSSHHosts(cert *x509.Certificate) ([]string, error)
 	GetSSHBastion(user string, hostname string) (*authority.Bastion, error)
 }
 
@@ -436,18 +437,12 @@ func (h *caHandler) SSHCheckHost(w http.ResponseWriter, r *http.Request) {
 
 // SSHGetHosts is the HTTP handler that returns a list of valid ssh hosts.
 func (h *caHandler) SSHGetHosts(w http.ResponseWriter, r *http.Request) {
-	if r.TLS == nil || len(r.TLS.PeerCertificates) == 0 {
-		WriteError(w, BadRequest(errors.New("missing peer certificate")))
-		return
+	var cert *x509.Certificate
+	if r.TLS != nil && len(r.TLS.PeerCertificates) > 0 {
+		cert = r.TLS.PeerCertificates[0]
 	}
 
-	cert := r.TLS.PeerCertificates[0]
-	email := cert.EmailAddresses[0]
-	if len(email) == 0 {
-		WriteError(w, BadRequest(errors.New("client certificate missing email SAN")))
-		return
-	}
-	hosts, err := h.Authority.GetSSHHosts(email)
+	hosts, err := h.Authority.GetSSHHosts(cert)
 	if err != nil {
 		WriteError(w, InternalServerError(err))
 		return

authority/authority.go

@@ -41,7 +41,7 @@ type Authority struct {
 	initOnce bool
 	// Custom functions
 	sshBastionFunc  func(user, hostname string) (*Bastion, error)
-	sshGetHostsFunc func(user string) ([]string, error)
+	sshGetHostsFunc func(cert *x509.Certificate) ([]string, error)
 	getIdentityFunc provisioner.GetIdentityFunc
 }
 

authority/options.go

@@ -1,6 +1,8 @@
 package authority
 
 import (
+	"crypto/x509"
+
 	"github.com/smallstep/certificates/authority/provisioner"
 	"github.com/smallstep/certificates/db"
 )
@@ -34,7 +36,7 @@ func WithSSHBastionFunc(fn func(user, host string) (*Bastion, error)) Option {
 
 // WithSSHGetHosts sets a custom function to get the bastion for a
 // given user-host pair.
-func WithSSHGetHosts(fn func(user string) ([]string, error)) Option {
+func WithSSHGetHosts(fn func(cert *x509.Certificate) ([]string, error)) Option {
 	return func(a *Authority) {
 		a.sshGetHostsFunc = fn
 	}

authority/ssh.go

@@ -3,6 +3,7 @@ package authority
 import (
 	"context"
 	"crypto/rand"
+	"crypto/x509"
 	"encoding/binary"
 	"net/http"
 	"strings"
@@ -673,15 +674,19 @@ func (a *Authority) CheckSSHHost(principal string) (bool, error) {
 }
 
 // GetSSHHosts returns a list of valid host principals.
-func (a *Authority) GetSSHHosts(email string) ([]string, error) {
-	if a.sshBastionFunc != nil {
-		return a.sshGetHostsFunc(email)
+func (a *Authority) GetSSHHosts(cert *x509.Certificate) ([]string, error) {
+	if a.sshGetHostsFunc != nil {
+		return a.sshGetHostsFunc(cert)
 	}
+	hosts, err := a.db.GetSSHHostPrincipals()
+	if err != nil {
 		return nil, &apiError{
-		err:  errors.New("getSSHHosts is not configured"),
-		code: http.StatusNotFound,
+			err:  errors.Wrap(err, "getSSHHosts"),
+			code: http.StatusInternalServerError,
 		}
 	}
+	return hosts, nil
+}
 
 func (a *Authority) getAddUserPrincipal() (cmd string) {
 	if a.config.SSH.AddUserPrincipal == "" {