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sign_public_key.go
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sign_public_key.go
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package req
import (
"encoding/base64"
"fmt"
"strings"
"time"
"github.com/pkg/errors"
"golang.org/x/crypto/ssh"
"github.com/dpb587/ssoca/certauth"
apierr "github.com/dpb587/ssoca/server/api/errors"
"github.com/dpb587/ssoca/server/service/dynamicvalue"
"github.com/dpb587/ssoca/server/service/req"
svcapi "github.com/dpb587/ssoca/service/ssh/api"
svcconfig "github.com/dpb587/ssoca/service/ssh/server/config"
)
type SignPublicKey struct {
Validity time.Duration
Principals dynamicvalue.MultiValue
CriticalOptions svcconfig.CriticalOptions
Extensions svcconfig.Extensions
CertAuth certauth.Provider
Target svcconfig.Target
req.WithAuthenticationRequired
}
var _ req.RouteHandler = SignPublicKey{}
func (h SignPublicKey) Route() string {
return "sign-public-key"
}
func (h SignPublicKey) Execute(request req.Request) error {
response := svcapi.SignPublicKeyResponse{}
payload := svcapi.SignPublicKeyRequest{}
err := request.ReadPayload(&payload)
if err != nil {
return err
}
parts := strings.SplitN(payload.PublicKey, " ", 3)
if len(parts) < 2 {
return apierr.NewError(errors.New("invalid public key format"), 400, "failed to read public key")
}
decoded, err := base64.StdEncoding.DecodeString(parts[1])
if err != nil {
return apierr.NewError(errors.Wrapf(err, "decoding public key"), 400, "failed to decode public key")
}
publicKey, err := ssh.ParsePublicKey([]byte(decoded))
if err != nil {
return apierr.NewError(errors.Wrapf(err, "parsing public key"), 400, "failed to parse public key")
}
now := time.Now()
certificate := ssh.Certificate{
// https://github.com/openssh/openssh-portable/blob/master/PROTOCOL.certkeys
Key: publicKey,
KeyId: request.AuthToken.ID,
CertType: ssh.UserCert,
ValidAfter: uint64(now.Add(-5 * time.Second).UTC().Unix()),
ValidBefore: uint64(now.Add(h.Validity).UTC().Unix()),
ValidPrincipals: []string{},
Permissions: ssh.Permissions{
CriticalOptions: map[string]string{},
Extensions: map[string]string{},
},
}
principals, err := h.Principals.Evaluate(request.RawRequest, request.AuthToken)
if err != nil {
return errors.Wrap(err, "evaluating principals")
}
principalsFiltered := []string{}
for _, principalsCandidate := range principals {
if principalsCandidate == "" {
continue
}
principalsFiltered = append(principalsFiltered, principalsCandidate)
}
certificate.ValidPrincipals = principalsFiltered
criticalOptions, err := h.CriticalOptions.Evaluate(request.RawRequest, request.AuthToken)
if err != nil {
return errors.Wrap(err, "evaluating critical options")
}
for criticalOption, criticalOptionData := range criticalOptions {
if criticalOptionData == "" {
continue
}
certificate.Permissions.CriticalOptions[string(criticalOption)] = criticalOptionData
}
for _, extension := range h.Extensions {
certificate.Permissions.Extensions[string(extension)] = ""
}
err = h.CertAuth.SignSSHCertificate(&certificate, request.LoggerContext)
if err != nil {
return errors.Wrap(err, "signing certificate")
}
response.Certificate = fmt.Sprintf("%s %s", certificate.Type(), base64.StdEncoding.EncodeToString(certificate.Marshal()))
{
target := &svcapi.SignPublicKeyTargetResponse{
Host: h.Target.Host,
Port: h.Target.Port,
PublicKey: h.Target.PublicKey,
}
targetUser, err := h.Target.User.Evaluate(request.RawRequest, request.AuthToken)
if err != nil {
return errors.Wrap(err, "evaluting target user")
}
target.User = targetUser
if target.Host != "" || target.Port != 0 || target.User != "" {
response.Target = target
}
}
return request.WritePayload(response)
}