/
service.go
196 lines (167 loc) · 4.79 KB
/
service.go
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package service
import (
"bufio"
"bytes"
"context"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/json"
"encoding/pem"
"fmt"
"io/ioutil"
"net/http"
"os"
"strings"
oidc "github.com/coreos/go-oidc"
"golang.org/x/crypto/ssh"
"golang.org/x/oauth2"
int_cache "github.com/puiterwijk/sanitarium/client/internal/cache"
"github.com/puiterwijk/sanitarium/shared/types"
)
type Service struct {
cache *int_cache.Cache
info types.ServiceInfo
provider *oidc.Provider
oauth2config oauth2.Config
}
func GetService(ctx context.Context, cache *int_cache.Cache, serverroot string) (*Service, error) {
resp, err := http.Get(serverroot + "/info")
if err != nil {
return nil, err
}
cts, err := ioutil.ReadAll(resp.Body)
resp.Body.Close()
if err != nil {
return nil, err
}
var service Service
service.cache = cache
err = json.Unmarshal(cts, &service.info)
if err != nil {
return nil, err
}
service.cache.SetIntermediatePublicKey(service.info.IntermediatePublicKey)
service.cache.SetSSHPublicKey(service.info.SSHPubKey)
service.provider, err = oidc.NewProvider(ctx, service.info.OIDC.ProviderRoot)
if err != nil {
return nil, err
}
redirurl := "urn:ietf:wg:oauth:2.0:oob"
if !service.info.OIDC.SupportsOOB {
redirurl = service.info.Root + "/token"
}
service.oauth2config = oauth2.Config{
ClientID: service.info.OIDC.ClientID,
ClientSecret: service.info.OIDC.ClientSecret,
Endpoint: service.provider.Endpoint(),
Scopes: service.info.OIDC.RequiredScopes,
// TODO: Maybe accept local URL
RedirectURL: redirurl,
}
return &service, nil
}
func (s *Service) GetServerRoot() string {
return s.info.Root
}
func (s *Service) RequiresTPM() bool {
return s.info.Requirements.TPM
}
func (s *Service) RequiresMeasurement() bool {
return s.info.Requirements.Measurements
}
func (s *Service) GetAuthorizationCode() (string, error) {
fmt.Fprintln(os.Stderr, "Please visit ", s.oauth2config.AuthCodeURL("nostate"))
// TODO: Maybe accept local url
return s.acceptManualAuthzCode()
}
func (s *Service) acceptManualAuthzCode() (string, error) {
fmt.Printf("Please enter authz code: ")
reader := bufio.NewReader(os.Stdin)
text, err := reader.ReadString('\n')
if err != nil {
return "", err
}
return strings.TrimSpace(text), nil
}
type apiError struct {
message string
}
func (a apiError) Error() string {
return fmt.Sprintf("API Error: %s", a.message)
}
func (s *Service) performRequest(relurl string, request interface{}, response interface{}) error {
var buf bytes.Buffer
err := json.NewEncoder(&buf).Encode(request)
if err != nil {
return err
}
resp, err := http.Post(s.info.Root+relurl, "text/json", &buf)
if err != nil {
return err
}
var apiresp types.APIResponse
err = json.NewDecoder(resp.Body).Decode(&apiresp)
if err != nil {
return err
}
if !apiresp.Success {
return apiError{
message: apiresp.Error,
}
}
return json.Unmarshal(apiresp.Response, response)
}
func (s *Service) RetrieveIntermediateCertificate(authzcode string, attestation *types.IntermediateCertificateRequestAttestation) error {
var request types.IntermediateCertificateRequest
request.AuthorizationCode = authzcode
request.Attestation = *attestation
var response types.IntermediateCertificateResponse
if err := s.performRequest("/cert/intermediate", request, &response); err != nil {
return err
}
return s.cache.SaveIntermediateCertificate(response.IntermediateCertificate)
}
func (s *Service) RetrieveSSHCertificate(servername string) error {
intcert, err := s.cache.GetIntermediateCertificate()
if err != nil {
return fmt.Errorf("Error while retrieving intermediate cert: %s", intcert)
}
rsakey, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
return fmt.Errorf("Error generating new private key: %s", err)
}
keybytes, err := x509.MarshalPKCS8PrivateKey(rsakey)
if err != nil {
return fmt.Errorf("Error marshalling key to PKCS8: %s", err)
}
privkey := pem.EncodeToMemory(&pem.Block{
Type: "PRIVATE KEY",
Bytes: keybytes,
})
pubsshkey, err := ssh.NewPublicKey(rsakey.Public())
if err != nil {
return fmt.Errorf("Error generating SSH public key: %s", err)
}
var (
request types.SSHCertRequest
response types.SSHCertResponse
)
request.IntermediateCert = intcert
request.PublicKey = pubsshkey.Marshal()
request.Servername = servername
if err := s.performRequest("/cert/ssh", request, &response); err != nil {
return err
}
if response.Certificate.IsCrypted {
response.Certificate.Contents, err = s.activateCredential(
response.Certificate.CryptedContents.EncryptedCredential,
response.Certificate.CryptedContents.Nonce,
response.Certificate.CryptedContents.Contents,
)
if err != nil {
return fmt.Errorf("Error activating credential: %s", err)
}
}
return s.cache.SaveSSHCert(servername, privkey, response.Certificate.Contents)
}