istio.io/istio@v0.0.0-20240520182934-d79c90f27776/security/pkg/nodeagent/caclient/providers/mock/mockcaclient.go (about)

     1  // Copyright Istio Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package mock
    16  
    17  import (
    18  	"encoding/pem"
    19  	"fmt"
    20  	"path"
    21  	"sync/atomic"
    22  	"time"
    23  
    24  	"istio.io/istio/security/pkg/pki/util"
    25  )
    26  
    27  var (
    28  	sampleKeyCertsPath = "../../../../samples/certs/"
    29  	caCertPath         = path.Join(sampleKeyCertsPath, "ca-cert.pem")
    30  	caKeyPath          = path.Join(sampleKeyCertsPath, "ca-key.pem")
    31  	certChainPath      = []string{path.Join(sampleKeyCertsPath, "cert-chain.pem")}
    32  	rootCertPath       = path.Join(sampleKeyCertsPath, "root-cert.pem")
    33  )
    34  
    35  // CAClient is the mocked CAClient for testing.
    36  type CAClient struct {
    37  	SignInvokeCount uint64
    38  	bundle          *util.KeyCertBundle
    39  	certLifetime    time.Duration
    40  	GeneratedCerts  [][]string // Cache the generated certificates for verification purpose.
    41  	mockTrustAnchor bool
    42  }
    43  
    44  // NewMockCAClient creates an instance of CAClient. errors is used to specify the number of errors
    45  // before CSRSign returns a valid response. certLifetime specifies the TTL for the newly issued workload cert.
    46  func NewMockCAClient(certLifetime time.Duration, mockTrustAnchor bool) (*CAClient, error) {
    47  	cl := CAClient{
    48  		SignInvokeCount: 0,
    49  		certLifetime:    certLifetime,
    50  		mockTrustAnchor: mockTrustAnchor,
    51  	}
    52  	bundle, err := util.NewVerifiedKeyCertBundleFromFile(caCertPath, caKeyPath, certChainPath, rootCertPath)
    53  	if err != nil {
    54  		return nil, fmt.Errorf("mock ca client creation error: %v", err)
    55  	}
    56  	cl.bundle = bundle
    57  
    58  	atomic.StoreUint64(&cl.SignInvokeCount, 0)
    59  	return &cl, nil
    60  }
    61  
    62  func (c *CAClient) Close() {}
    63  
    64  // CSRSign returns the certificate or errors depending on the settings.
    65  func (c *CAClient) CSRSign(csrPEM []byte, certValidTTLInSec int64) ([]string, error) {
    66  	atomic.AddUint64(&c.SignInvokeCount, 1)
    67  	signingCert, signingKey, certChain, rootCert := c.bundle.GetAll()
    68  	csr, err := util.ParsePemEncodedCSR(csrPEM)
    69  	if err != nil {
    70  		return nil, fmt.Errorf("csr sign error: %v", err)
    71  	}
    72  	subjectIDs := []string{"test"}
    73  	certBytes, err := util.GenCertFromCSR(csr, signingCert, csr.PublicKey, *signingKey, subjectIDs, c.certLifetime, false)
    74  	if err != nil {
    75  		return nil, fmt.Errorf("csr sign error: %v", err)
    76  	}
    77  
    78  	block := &pem.Block{
    79  		Type:  "CERTIFICATE",
    80  		Bytes: certBytes,
    81  	}
    82  	cert := pem.EncodeToMemory(block)
    83  
    84  	ret := []string{string(cert), string(certChain), string(rootCert)}
    85  	c.GeneratedCerts = append(c.GeneratedCerts, ret)
    86  	return ret, nil
    87  }
    88  
    89  func (c *CAClient) GetRootCertBundle() ([]string, error) {
    90  	if c.mockTrustAnchor {
    91  		rootCertBytes := c.bundle.GetRootCertPem()
    92  		return []string{string(rootCertBytes)}, nil
    93  	}
    94  
    95  	return []string{}, nil
    96  }