sshpop first pass

2019-10-26 17:40:43 -07:00 · 2019-10-26 17:40:43 -07:00 · b5f15531d8
commit b5f15531d8
parent 36fc7fa174
4 changed files with 433 additions and 12 deletions
--- a/authority/provisioner/provisioner.go
+++ b/authority/provisioner/provisioner.go
@ -90,6 +90,8 @@ const (
 	TypeX5C Type = 7
 	// TypeK8sSA is used to indicate the X5C provisioners.
 	TypeK8sSA Type = 8
+	// TypeSSHPOP is used to indicate the SSHPOP provisioners.
+	TypeSSHPOP Type = 9

 	// RevokeAudienceKey is the key for the 'revoke' audiences in the audiences map.
 	RevokeAudienceKey = "revoke"
@ -116,6 +118,8 @@ func (t Type) String() string {
 		return "X5C"
 	case TypeK8sSA:
 		return "K8sSA"
+	case TypeSSHPOP:
+		return "SSHPOP"
 	default:
 		return ""
 	}
@ -169,6 +173,8 @@ func (l *List) UnmarshalJSON(data []byte) error {
 			p = &X5C{}
 		case "k8ssa":
 			p = &K8sSA{}
+		case "sshpop":
+			p = &SSHPOP{}
 		default:
 			// Skip unsupported provisioners. A client using this method may be
 			// compiled with a version of smallstep/certificates that does not
--- a/authority/provisioner/sshpop.go
+++ b/authority/provisioner/sshpop.go
@ -0,0 +1,307 @@
+package provisioner
+
+import (
+	"context"
+	"crypto/ecdsa"
+	"crypto/rsa"
+	"crypto/x509"
+	"encoding/base64"
+	"encoding/pem"
+	"time"
+
+	"github.com/pkg/errors"
+	"github.com/smallstep/cli/crypto/pemutil"
+	"github.com/smallstep/cli/crypto/x509util"
+	"github.com/smallstep/cli/jose"
+	"golang.org/x/crypto/ed25519"
+	"golang.org/x/crypto/ssh"
+)
+
+// sshPOPPayload extends jwt.Claims with step attributes.
+type sshPOPPayload struct {
+	jose.Claims
+	SANs    []string     `json:"sans,omitempty"`
+	Step    *stepPayload `json:"step,omitempty"`
+	sshCert *ssh.Certificate
+}
+
+// SSHPOP is the default provisioner, an entity that can sign tokens necessary for
+// signature requests.
+type SSHPOP struct {
+	Type       string  `json:"type"`
+	Name       string  `json:"name"`
+	PubKeys    []byte  `json:"pubKeys"`
+	Claims     *Claims `json:"claims,omitempty"`
+	claimer    *Claimer
+	audiences  Audiences
+	sshPubKeys []ssh.PublicKey
+}
+
+// GetID returns the provisioner unique identifier. The name and credential id
+// should uniquely identify any SSH-POP provisioner.
+func (p *SSHPOP) GetID() string {
+	return "sshpop/" + p.Name
+}
+
+// GetTokenID returns the identifier of the token.
+func (p *SSHPOP) GetTokenID(ott string) (string, error) {
+	// Validate payload
+	token, err := jose.ParseSigned(ott)
+	if err != nil {
+		return "", errors.Wrap(err, "error parsing token")
+	}
+
+	// Get claims w/out verification. We need to look up the provisioner
+	// key in order to verify the claims and we need the issuer from the claims
+	// before we can look up the provisioner.
+	var claims jose.Claims
+	if err = token.UnsafeClaimsWithoutVerification(&claims); err != nil {
+		return "", errors.Wrap(err, "error verifying claims")
+	}
+	return claims.ID, nil
+}
+
+// GetName returns the name of the provisioner.
+func (p *SSHPOP) GetName() string {
+	return p.Name
+}
+
+// GetType returns the type of provisioner.
+func (p *SSHPOP) GetType() Type {
+	return TypeSSHPOP
+}
+
+// GetEncryptedKey returns the base provisioner encrypted key if it's defined.
+func (p *SSHPOP) GetEncryptedKey() (string, string, bool) {
+	return "", "", false
+}
+
+// Init initializes and validates the fields of a SSHPOP type.
+func (p *SSHPOP) Init(config Config) error {
+	switch {
+	case p.Type == "":
+		return errors.New("provisioner type cannot be empty")
+	case p.Name == "":
+		return errors.New("provisioner name cannot be empty")
+	case len(p.PubKeys) == 0:
+		return errors.New("provisioner root(s) cannot be empty")
+	}
+
+	var (
+		block *pem.Block
+		rest  = p.PubKeys
+	)
+	for rest != nil {
+		block, rest = pem.Decode(rest)
+		if block == nil {
+			break
+		}
+		key, err := pemutil.ParseKey(pem.EncodeToMemory(block))
+		if err != nil {
+			return errors.Wrapf(err, "error parsing public key in provisioner %s", p.GetID())
+		}
+		switch q := key.(type) {
+		case *rsa.PublicKey, *ecdsa.PublicKey, ed25519.PublicKey:
+			sshKey, err := ssh.NewPublicKey(key)
+			if err != nil {
+				return errors.Wrap(err, "error converting pub key to SSH pub key")
+			}
+			p.sshPubKeys = append(p.sshPubKeys, sshKey)
+		default:
+			return errors.Errorf("Unexpected public key type %T in provisioner %s", q, p.GetID())
+		}
+	}
+
+	// Verify that at least one root was found.
+	if len(p.sshPubKeys) == 0 {
+		return errors.Errorf("no root public keys found in pub keys attribute for provisioner %s", p.GetName())
+	}
+
+	// Update claims with global ones
+	var err error
+	if p.claimer, err = NewClaimer(p.Claims, config.Claims); err != nil {
+		return err
+	}
+
+	p.audiences = config.Audiences.WithFragment(p.GetID())
+	return nil
+}
+
+// authorizeToken performs common jwt authorization actions and returns the
+// claims for case specific downstream parsing.
+// e.g. a Sign request will auth/validate different fields than a Revoke request.
+func (p *SSHPOP) authorizeToken(token string, audiences []string) (*sshPOPPayload, error) {
+	jwt, err := jose.ParseSigned(token)
+	if err != nil {
+		return nil, errors.Wrapf(err, "error parsing token")
+	}
+
+	encodedSSHCert, ok := jwt.Headers[0].ExtraHeaders["sshpop"]
+	if !ok {
+		return nil, errors.New("token missing sshpop header")
+	}
+	encodedSSHCertStr, ok := encodedSSHCert.(string)
+	if !ok {
+		return nil, errors.New("error unexpected type for sshpop header")
+	}
+	sshCertBytes, err := base64.RawURLEncoding.DecodeString(encodedSSHCertStr)
+	if err != nil {
+		return nil, errors.Wrap(err, "error decoding sshpop header")
+	}
+	sshPub, err := ssh.ParsePublicKey(sshCertBytes)
+	if err != nil {
+		return nil, errors.Wrap(err, "error parsing ssh public key")
+	}
+	sshCert, ok := sshPub.(*ssh.Certificate)
+	if !ok {
+		return nil, errors.New("error converting ssh public key to ssh certificate")
+	}
+
+	data := bytesForSigning(sshCert)
+	var found bool
+	for _, k := range p.sshPubKeys {
+		if err = (&ssh.Certificate{Key: k}).Verify(data, sshCert.Signature); err == nil {
+			found = true
+		}
+	}
+	if !found {
+		return nil, errors.New("error: provisioner could could not verify the sshpop header certificate")
+	}
+
+	// Using the leaf certificates key to validate the claims accomplishes two
+	// things:
+	//   1. Asserts that the private key used to sign the token corresponds
+	//      to the public certificate in the `sshpop` header of the token.
+	//   2. Asserts that the claims are valid - have not been tampered with.
+	var claims sshPOPPayload
+	if err = jwt.Claims(sshCert.Key, &claims); err != nil {
+		return nil, errors.Wrap(err, "error parsing claims")
+	}
+
+	// According to "rfc7519 JSON Web Token" acceptable skew should be no
+	// more than a few minutes.
+	if err = claims.ValidateWithLeeway(jose.Expected{
+		Issuer: p.Name,
+		Time:   time.Now().UTC(),
+	}, time.Minute); err != nil {
+		return nil, errors.Wrapf(err, "invalid token")
+	}
+
+	// validate audiences with the defaults
+	if !matchesAudience(claims.Audience, audiences) {
+		return nil, errors.New("invalid token: invalid audience claim (aud)")
+	}
+
+	if claims.Subject == "" {
+		return nil, errors.New("token subject cannot be empty")
+	}
+
+	claims.sshCert = sshCert
+	return &claims, nil
+}
+
+// AuthorizeRevoke returns an error if the provisioner does not have rights to
+// revoke the certificate with serial number in the `sub` property.
+func (p *SSHPOP) AuthorizeRevoke(token string) error {
+	_, err := p.authorizeToken(token, p.audiences.Revoke)
+	return err
+}
+
+// AuthorizeSign validates the given token.
+func (p *SSHPOP) AuthorizeSign(ctx context.Context, token string) ([]SignOption, error) {
+	claims, err := p.authorizeToken(token, p.audiences.Sign)
+	if err != nil {
+		return nil, err
+	}
+
+	// Check for SSH sign-ing request.
+	if MethodFromContext(ctx) == SignSSHMethod {
+		if !p.claimer.IsSSHCAEnabled() {
+			return nil, errors.Errorf("ssh ca is disabled for provisioner %s", p.GetID())
+		}
+		return p.authorizeSSHSign(claims)
+	}
+
+	// NOTE: This is for backwards compatibility with older versions of cli
+	// and certificates. Older versions added the token subject as the only SAN
+	// in a CSR by default.
+	if len(claims.SANs) == 0 {
+		claims.SANs = []string{claims.Subject}
+	}
+
+	dnsNames, ips, emails := x509util.SplitSANs(claims.SANs)
+
+	return []SignOption{
+		// modifiers / withOptions
+		newProvisionerExtensionOption(TypeSSHPOP, p.Name, ""),
+		profileLimitDuration{p.claimer.DefaultTLSCertDuration(), time.Unix(int64(claims.sshCert.ValidBefore), 0)},
+		// validators
+		commonNameValidator(claims.Subject),
+		defaultPublicKeyValidator{},
+		dnsNamesValidator(dnsNames),
+		emailAddressesValidator(emails),
+		ipAddressesValidator(ips),
+		newValidityValidator(p.claimer.MinTLSCertDuration(), p.claimer.MaxTLSCertDuration()),
+	}, nil
+}
+
+// AuthorizeRenewal returns an error if the renewal is disabled.
+func (p *SSHPOP) AuthorizeRenewal(cert *x509.Certificate) error {
+	if p.claimer.IsDisableRenewal() {
+		return errors.Errorf("renew is disabled for provisioner %s", p.GetID())
+	}
+	return nil
+}
+
+// authorizeSSHSign returns the list of SignOption for a SignSSH request.
+func (p *SSHPOP) authorizeSSHSign(claims *sshPOPPayload) ([]SignOption, error) {
+	if claims.Step == nil || claims.Step.SSH == nil {
+		return nil, errors.New("authorization token must be an SSH provisioning token")
+	}
+	opts := claims.Step.SSH
+	signOptions := []SignOption{
+		// validates user's SSHOptions with the ones in the token
+		sshCertificateOptionsValidator(*opts),
+		// set the key id to the token subject
+		sshCertificateKeyIDModifier(claims.Subject),
+	}
+
+	// Add modifiers from custom claims
+	if opts.CertType != "" {
+		signOptions = append(signOptions, sshCertificateCertTypeModifier(opts.CertType))
+	}
+	if len(opts.Principals) > 0 {
+		signOptions = append(signOptions, sshCertificatePrincipalsModifier(opts.Principals))
+	}
+	t := now()
+	if !opts.ValidAfter.IsZero() {
+		signOptions = append(signOptions, sshCertificateValidAfterModifier(opts.ValidAfter.RelativeTime(t).Unix()))
+	}
+	if !opts.ValidBefore.IsZero() {
+		signOptions = append(signOptions, sshCertificateValidBeforeModifier(opts.ValidBefore.RelativeTime(t).Unix()))
+	}
+
+	// Default to a user certificate with no principals if not set
+	signOptions = append(signOptions, sshCertificateDefaultsModifier{CertType: SSHUserCert})
+
+	return append(signOptions,
+		// Set the default extensions.
+		&sshDefaultExtensionModifier{},
+		// Checks the validity bounds, and set the validity if has not been set.
+		sshLimitValidityModifier(p.claimer, time.Unix(int64(claims.sshCert.ValidBefore), 0)),
+		// Validate public key.
+		&sshDefaultPublicKeyValidator{},
+		// Validate the validity period.
+		&sshCertificateValidityValidator{p.claimer},
+		// Require all the fields in the SSH certificate
+		&sshCertificateDefaultValidator{},
+	), nil
+}
+
+func bytesForSigning(cert *ssh.Certificate) []byte {
+	c2 := *cert
+	c2.Signature = nil
+	out := c2.Marshal()
+	// Drop trailing signature length.
+	return out[:len(out)-4]
+}
--- a/go.mod
+++ b/go.mod
@ -5,16 +5,7 @@ go 1.13
 require (
 	github.com/Masterminds/sprig/v3 v3.0.0
 	github.com/go-chi/chi v3.3.4-0.20181024101233-0ebf7795c516+incompatible
-	github.com/go-sql-driver/mysql v1.4.1 // indirect
 	github.com/golangci/golangci-lint v1.18.0 // indirect
-	github.com/imdario/mergo v0.3.8 // indirect
-	github.com/juju/ansiterm v0.0.0-20180109212912-720a0952cc2a // indirect
-	github.com/konsorten/go-windows-terminal-sequences v1.0.1 // indirect
-	github.com/kr/pretty v0.1.0 // indirect
-	github.com/lunixbochs/vtclean v0.0.0-20180621232353-2d01aacdc34a // indirect
-	github.com/manifoldco/promptui v0.3.1 // indirect
-	github.com/mattn/go-colorable v0.0.9 // indirect
-	github.com/mattn/go-isatty v0.0.4 // indirect
 	github.com/newrelic/go-agent v1.11.0
 	github.com/pkg/errors v0.8.1
 	github.com/rs/xid v1.2.1
--- a/go.sum
+++ b/go.sum
@ -2,15 +2,15 @@ github.com/AndreasBriese/bbloom v0.0.0-20190306092124-e2d15f34fcf9 h1:HD8gA2tkBy
 github.com/AndreasBriese/bbloom v0.0.0-20190306092124-e2d15f34fcf9/go.mod h1:bOvUY6CB00SOBii9/FifXqc0awNKxLFCL/+pkDPuyl8=
 github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/OpenPeeDeeP/depguard v1.0.0 h1:k9QF73nrHT3nPLz3lu6G5s+3Hi8Je36ODr1F5gjAXXM=
-github.com/OpenPeeDeeP/depguard v1.0.0/go.mod h1:7/4sitnI9YlQgTLLk734QlzXT8DuHVnAyztLplQjk+o=
-github.com/StackExchange/wmi v0.0.0-20180116203802-5d049714c4a6/go.mod h1:3eOhrUMpNV+6aFIbp5/iudMxNCF27Vw2OZgy4xEx0Fg=
 github.com/Masterminds/goutils v1.1.0 h1:zukEsf/1JZwCMgHiK3GZftabmxiCw4apj3a28RPBiVg=
 github.com/Masterminds/goutils v1.1.0/go.mod h1:8cTjp+g8YejhMuvIA5y2vz3BpJxksy863GQaJW2MFNU=
 github.com/Masterminds/semver/v3 v3.0.1 h1:2kKm5lb7dKVrt5TYUiAavE6oFc1cFT0057UVGT+JqLk=
 github.com/Masterminds/semver/v3 v3.0.1/go.mod h1:VPu/7SZ7ePZ3QOrcuXROw5FAcLl4a0cBrbBpGY/8hQs=
 github.com/Masterminds/sprig/v3 v3.0.0 h1:KSQz7Nb08/3VU9E4ns29dDxcczhOD1q7O1UfM4G3t3g=
 github.com/Masterminds/sprig/v3 v3.0.0/go.mod h1:NEUY/Qq8Gdm2xgYA+NwJM6wmfdRV9xkh8h/Rld20R0U=
+github.com/OpenPeeDeeP/depguard v1.0.0 h1:k9QF73nrHT3nPLz3lu6G5s+3Hi8Je36ODr1F5gjAXXM=
+github.com/OpenPeeDeeP/depguard v1.0.0/go.mod h1:7/4sitnI9YlQgTLLk734QlzXT8DuHVnAyztLplQjk+o=
+github.com/StackExchange/wmi v0.0.0-20180116203802-5d049714c4a6/go.mod h1:3eOhrUMpNV+6aFIbp5/iudMxNCF27Vw2OZgy4xEx0Fg=
 github.com/ThomasRooney/gexpect v0.0.0-20161231170123-5482f0350944/go.mod h1:sPML5WwI6oxLRLPuuqbtoOKhtmpVDCYtwsps+I+vjIY=
 github.com/asaskevich/govalidator v0.0.0-20180315120708-ccb8e960c48f/go.mod h1:lB+ZfQJz7igIIfQNfa7Ml4HSf2uFQQRzpGGRXenZAgY=
 github.com/boombuler/barcode v1.0.0/go.mod h1:paBWMcWSl3LHKBqUq+rly7CNSldXjb2rDl3JlRe0mD8=
@ -28,27 +28,76 @@ github.com/dgraph-io/badger v1.5.3 h1:5oWIuRvwn93cie+OSt1zSnkaIQ1JFQM8bGlIv6O6St
 github.com/dgraph-io/badger v1.5.3/go.mod h1:VZxzAIRPHRVNRKRo6AXrX9BJegn6il06VMTZVJYCIjQ=
 github.com/dgryski/go-farm v0.0.0-20190423205320-6a90982ecee2 h1:tdlZCpZ/P9DhczCTSixgIKmwPv6+wP5DGjqLYw5SUiA=
 github.com/dgryski/go-farm v0.0.0-20190423205320-6a90982ecee2/go.mod h1:SqUrOPUnsFjfmXRMNPybcSiG0BgUW2AuFH8PAnS2iTw=
+github.com/fatih/color v1.6.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
+github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
 github.com/go-chi/chi v3.3.4-0.20181024101233-0ebf7795c516+incompatible h1:QkUV3XfIQZlGH/Y84jpL20do5cooBfUMzPRNRZvVkZ0=
 github.com/go-chi/chi v3.3.4-0.20181024101233-0ebf7795c516+incompatible/go.mod h1:eB3wogJHnLi3x/kFX2A+IbTBlXxmMeXJVKy9tTv1XzQ=
+github.com/go-critic/go-critic v0.3.5-0.20190526074819-1df300866540/go.mod h1:+sE8vrLDS2M0pZkBk0wy6+nLdKexVDrl/jBqQOTDThA=
+github.com/go-lintpack/lintpack v0.5.2/go.mod h1:NwZuYi2nUHho8XEIZ6SIxihrnPoqBTDqfpXvXAN0sXM=
+github.com/go-ole/go-ole v1.2.1/go.mod h1:7FAglXiTm7HKlQRDeOQ6ZNUHidzCWXuZWq/1dTyBNF8=
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 github.com/go-sql-driver/mysql v1.4.1/go.mod h1:zAC/RDZ24gD3HViQzih4MyKcchzm+sOG5ZlKdlhCg5w=
+github.com/go-toolsmith/astcast v1.0.0/go.mod h1:mt2OdQTeAQcY4DQgPSArJjHCcOwlX+Wl/kwN+LbLGQ4=
+github.com/go-toolsmith/astcopy v1.0.0/go.mod h1:vrgyG+5Bxrnz4MZWPF+pI4R8h3qKRjjyvV/DSez4WVQ=
+github.com/go-toolsmith/astequal v0.0.0-20180903214952-dcb477bfacd6/go.mod h1:H+xSiq0+LtiDC11+h1G32h7Of5O3CYFJ99GVbS5lDKY=
+github.com/go-toolsmith/astequal v1.0.0/go.mod h1:H+xSiq0+LtiDC11+h1G32h7Of5O3CYFJ99GVbS5lDKY=
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+github.com/go-toolsmith/astfmt v1.0.0/go.mod h1:cnWmsOAuq4jJY6Ct5YWlVLmcmLMn1JUPuQIHCY7CJDw=
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+github.com/go-toolsmith/astp v0.0.0-20180903215135-0af7e3c24f30/go.mod h1:SV2ur98SGypH1UjcPpCatrV5hPazG6+IfNHbkDXBRrk=
+github.com/go-toolsmith/astp v1.0.0/go.mod h1:RSyrtpVlfTFGDYRbrjyWP1pYu//tSFcvdYrA8meBmLI=
+github.com/go-toolsmith/pkgload v0.0.0-20181119091011-e9e65178eee8/go.mod h1:WoMrjiy4zvdS+Bg6z9jZH82QXwkcgCBX6nOfnmdaHks=
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 github.com/golang/protobuf v1.3.1 h1:YF8+flBXS5eO826T4nzqPrxfhQThhXl0YzfuUPu4SBg=
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