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Add CSR check for number of URIs. (#14579) 

Add CSR check for number of URIs.
This commit is contained in:
Derek Menteer 2022-09-13 14:21:47 -05:00 committed by GitHub
parent 15043de647
commit 0aa13733a0
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GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 281 additions and 7 deletions
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3
.changelog/14579.txt Normal file
View File

@ -0,0 +1,3 @@
```release-note:security
connect: Added URI length checks to ConnectCA CSR requests. Prior to this change, it was possible for a malicious actor to designate multiple SAN URI values in a call to the `ConnectCA.Sign` endpoint. The endpoint now only allows for exactly one SAN URI to be specified.
```

9
agent/consul/auto_config_endpoint.go
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@ -394,9 +394,12 @@ func parseAutoConfigCSR(csr string) (*x509.CertificateRequest, *connect.SpiffeID
return nil, nil, fmt.Errorf("Failed to parse CSR: %w", err)
}
// ensure that a URI SAN is present
if len(x509CSR.URIs) < 1 {
return nil, nil, fmt.Errorf("CSR didn't include any URI SANs")
// ensure that exactly one URI SAN is present
if len(x509CSR.URIs) != 1 {
return nil, nil, fmt.Errorf("CSR SAN contains an invalid number of URIs: %v", len(x509CSR.URIs))
}
if len(x509CSR.EmailAddresses) > 0 {
return nil, nil, fmt.Errorf("CSR SAN does not allow specifying email addresses")
}
// Parse the SPIFFE ID

125
agent/consul/auto_config_endpoint_test.go
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@ -1,12 +1,17 @@
package consul
import (
"bytes"
"crypto"
crand "crypto/rand"
"crypto/x509"
"encoding/base64"
"encoding/pem"
"fmt"
"io/ioutil"
"math/rand"
"net"
"net/url"
"path"
"testing"
"time"
@ -874,6 +879,126 @@ func TestAutoConfig_updateJoinAddressesInConfig(t *testing.T) {
backend.AssertExpectations(t)
}
func TestAutoConfig_parseAutoConfigCSR(t *testing.T) {
// createCSR copies the behavior of connect.CreateCSR with some
// customizations to allow for better unit testing.
createCSR := func(tmpl *x509.CertificateRequest, privateKey crypto.Signer) (string, error) {
connect.HackSANExtensionForCSR(tmpl)
bs, err := x509.CreateCertificateRequest(crand.Reader, tmpl, privateKey)
require.NoError(t, err)
var csrBuf bytes.Buffer
err = pem.Encode(&csrBuf, &pem.Block{Type: "CERTIFICATE REQUEST", Bytes: bs})
require.NoError(t, err)
return csrBuf.String(), nil
}
pk, _, err := connect.GeneratePrivateKey()
require.NoError(t, err)
agentURI := connect.SpiffeIDAgent{
Host: "test-host",
Datacenter: "tdc1",
Agent: "test-agent",
}.URI()
tests := []struct {
name string
setup func() string
expectErr string
}{
{
name: "err_garbage_data",
expectErr: "Failed to parse CSR",
setup: func() string { return "garbage" },
},
{
name: "err_not_one_uri",
expectErr: "CSR SAN contains an invalid number of URIs",
setup: func() string {
tmpl := &x509.CertificateRequest{
URIs: []*url.URL{agentURI, agentURI},
SignatureAlgorithm: connect.SigAlgoForKey(pk),
}
csr, err := createCSR(tmpl, pk)
require.NoError(t, err)
return csr
},
},
{
name: "err_email",
expectErr: "CSR SAN does not allow specifying email addresses",
setup: func() string {
tmpl := &x509.CertificateRequest{
URIs: []*url.URL{agentURI},
EmailAddresses: []string{"test@example.com"},
SignatureAlgorithm: connect.SigAlgoForKey(pk),
}
csr, err := createCSR(tmpl, pk)
require.NoError(t, err)
return csr
},
},
{
name: "err_spiffe_parse_uri",
expectErr: "Failed to parse the SPIFFE URI",
setup: func() string {
tmpl := &x509.CertificateRequest{
URIs: []*url.URL{connect.SpiffeIDAgent{}.URI()},
SignatureAlgorithm: connect.SigAlgoForKey(pk),
}
csr, err := createCSR(tmpl, pk)
require.NoError(t, err)
return csr
},
},
{
name: "err_not_agent",
expectErr: "SPIFFE ID is not an Agent ID",
setup: func() string {
spiffe := connect.SpiffeIDService{
Namespace: "tns",
Datacenter: "tdc1",
Service: "test-service",
}
tmpl := &x509.CertificateRequest{
URIs: []*url.URL{spiffe.URI()},
SignatureAlgorithm: connect.SigAlgoForKey(pk),
}
csr, err := createCSR(tmpl, pk)
require.NoError(t, err)
return csr
},
},
{
name: "success",
setup: func() string {
tmpl := &x509.CertificateRequest{
URIs: []*url.URL{agentURI},
SignatureAlgorithm: connect.SigAlgoForKey(pk),
}
csr, err := createCSR(tmpl, pk)
require.NoError(t, err)
return csr
},
},
}
for _, tc := range tests {
t.Run(tc.name, func(t *testing.T) {
req, spif, err := parseAutoConfigCSR(tc.setup())
if tc.expectErr != "" {
require.Error(t, err)
require.Contains(t, err.Error(), tc.expectErr)
} else {
require.NoError(t, err)
// TODO better verification of these
require.NotNil(t, req)
require.NotNil(t, spif)
}
})
}
}
func TestAutoConfig_invalidSegmentName(t *testing.T) {
invalid := []string{
"\n",

13
agent/consul/leader_connect_ca.go
View File

@ -1406,10 +1406,15 @@ func (l *connectSignRateLimiter) getCSRRateLimiterWithLimit(limit rate.Limit) *r
// identified by the SPIFFE ID in the given CSR's SAN. It performs authorization
// using the given acl.Authorizer.
func (c *CAManager) AuthorizeAndSignCertificate(csr *x509.CertificateRequest, authz acl.Authorizer) (*structs.IssuedCert, error) {
// Parse the SPIFFE ID from the CSR SAN.
if len(csr.URIs) == 0 {
return nil, connect.InvalidCSRError("CSR SAN does not contain a SPIFFE ID")
// Note that only one spiffe id is allowed currently. If more than one is desired
// in future implmentations, then each ID should have authorization checks.
if len(csr.URIs) != 1 {
return nil, connect.InvalidCSRError("CSR SAN contains an invalid number of URIs: %v", len(csr.URIs))
}
if len(csr.EmailAddresses) > 0 {
return nil, connect.InvalidCSRError("CSR SAN does not allow specifying email addresses")
}
// Parse the SPIFFE ID from the CSR SAN.
spiffeID, err := connect.ParseCertURI(csr.URIs[0])
if err != nil {
return nil, err
@ -1465,7 +1470,7 @@ func (c *CAManager) AuthorizeAndSignCertificate(csr *x509.CertificateRequest, au
"we are %s", v.Datacenter, dc)
}
default:
return nil, connect.InvalidCSRError("SPIFFE ID in CSR must be a service or agent ID")
return nil, connect.InvalidCSRError("SPIFFE ID in CSR must be a service, mesh-gateway, or agent ID")
}
return c.SignCertificate(csr, spiffeID)

138
agent/consul/leader_connect_ca_test.go
View File

@ -24,6 +24,7 @@ import (
msgpackrpc "github.com/hashicorp/consul-net-rpc/net-rpc-msgpackrpc"
"github.com/hashicorp/consul-net-rpc/net/rpc"
"github.com/hashicorp/consul/acl"
"github.com/hashicorp/consul/agent/connect"
ca "github.com/hashicorp/consul/agent/connect/ca"
"github.com/hashicorp/consul/agent/consul/fsm"
@ -1082,3 +1083,140 @@ func TestCAManager_Sign_SpiffeIDServer(t *testing.T) {
// Verify the Server's URI.
require.Equal(t, fmt.Sprintf("spiffe://%s/agent/server/dc/dc1", roots.TrustDomain), cert.ServerURI)
}
func TestCAManager_AuthorizeAndSignCertificate(t *testing.T) {
conf := DefaultConfig()
conf.PrimaryDatacenter = "dc1"
conf.Datacenter = "dc2"
manager := NewCAManager(nil, nil, testutil.Logger(t), conf)
agentURL := connect.SpiffeIDAgent{
Agent: "test-agent",
Datacenter: conf.PrimaryDatacenter,
Host: "test-host",
}.URI()
serviceURL := connect.SpiffeIDService{
Datacenter: conf.PrimaryDatacenter,
Namespace: "ns1",
Service: "test-service",
}.URI()
meshURL := connect.SpiffeIDMeshGateway{
Datacenter: conf.PrimaryDatacenter,
Host: "test-host",
Partition: "test-partition",
}.URI()
tests := []struct {
name string
expectErr string
getCSR func() *x509.CertificateRequest
authAllow bool
}{
{
name: "err_not_one_uri",
expectErr: "CSR SAN contains an invalid number of URIs",
getCSR: func() *x509.CertificateRequest {
return &x509.CertificateRequest{
URIs: []*url.URL{agentURL, agentURL},
}
},
},
{
name: "err_email",
expectErr: "CSR SAN does not allow specifying email addresses",
getCSR: func() *x509.CertificateRequest {
return &x509.CertificateRequest{
URIs: []*url.URL{agentURL},
EmailAddresses: []string{"test@example.com"},
}
},
},
{
name: "err_invalid_spiffe_id",
expectErr: "SPIFFE ID is not in the expected format",
getCSR: func() *x509.CertificateRequest {
return &x509.CertificateRequest{
URIs: []*url.URL{connect.SpiffeIDAgent{}.URI()},
}
},
},
{
name: "err_service_write_not_allowed",
expectErr: "Permission denied",
getCSR: func() *x509.CertificateRequest {
return &x509.CertificateRequest{
URIs: []*url.URL{serviceURL},
}
},
},
{
name: "err_service_different_dc",
expectErr: "SPIFFE ID in CSR from a different datacenter",
authAllow: true,
getCSR: func() *x509.CertificateRequest {
return &x509.CertificateRequest{
URIs: []*url.URL{serviceURL},
}
},
},
{
name: "err_agent_write_not_allowed",
expectErr: "Permission denied",
getCSR: func() *x509.CertificateRequest {
return &x509.CertificateRequest{
URIs: []*url.URL{agentURL},
}
},
},
{
name: "err_meshgw_write_not_allowed",
expectErr: "Permission denied",
getCSR: func() *x509.CertificateRequest {
return &x509.CertificateRequest{
URIs: []*url.URL{meshURL},
}
},
},
{
name: "err_meshgw_different_dc",
expectErr: "SPIFFE ID in CSR from a different datacenter",
authAllow: true,
getCSR: func() *x509.CertificateRequest {
return &x509.CertificateRequest{
URIs: []*url.URL{meshURL},
}
},
},
{
name: "err_invalid_spiffe_type",
expectErr: "SPIFFE ID in CSR must be a service, mesh-gateway, or agent ID",
getCSR: func() *x509.CertificateRequest {
u := connect.SpiffeIDSigning{
ClusterID: "test-cluster-id",
Domain: "test-domain",
}.URI()
return &x509.CertificateRequest{
URIs: []*url.URL{u},
}
},
},
}
for _, tc := range tests {
t.Run(tc.name, func(t *testing.T) {
authz := acl.DenyAll()
if tc.authAllow {
authz = acl.AllowAll()
}
cert, err := manager.AuthorizeAndSignCertificate(tc.getCSR(), authz)
if tc.expectErr != "" {
require.Error(t, err)
require.Contains(t, err.Error(), tc.expectErr)
} else {
require.NoError(t, err)
require.NotNil(t, cert)
}
})
}
}