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在ASM入口网关上配置mTLS服务并限制特定客户端访问

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ASM网关支持对外提供mTLS服务。mTLS协议要求客户端提供自身证书，证书中包含了用户的身份信息。您可以在授权策略中配置只有特定的用户才可以成功访问该服务，进而为服务提供更加高级别的保护。本文将介绍如何在ASM入口网关上配置mTLS服务，并且通过授权策略实现对特定用户的访问限制。

前提条件

步骤一：生成mTLS通信证书

说明

在创建证书时，如果需要填写证书信息，请使用默认值。这些默认值已在配置文件中预先设置。

  1. 使用以下内容创建ca.cnf文件，生成根证书。

    展开查看CNF文件内容

    HOME = .`
RANDFILE = $ENV::HOME/.rnd
####################################################################
[ ca ]
default_ca = CA_default # The default ca section
[ CA_default ]
default_days = 1000 # how long to certify for
default_crl_days = 30 # how long before next CRL
default_md = sha256 # use public key default MD
preserve = no # keep passed DN ordering
x509_extensions = ca_extensions # The extensions to add to the cert
email_in_dn = no # Don't concat the email in the DN
copy_extensions = copy # Required to copy SANs from CSR to cert

#====Following 7 lines are for signing other certs, not for making the CA cert.====
base_dir = .
certificate = $base_dir/cacert.pem # The CA certifcate
private_key = $base_dir/cakey.pem # The CA private key
new_certs_dir = $base_dir # Location for new certs after signing
database = $base_dir/index.txt # Database index file
serial = $base_dir/serial.txt # The current serial number
unique_subject = no # Set to 'no' to allow creation of several certificates with same subject.

####################################################################
[ req ]
default_bits = 4096
default_keyfile = cakey.pem
distinguished_name = ca_distinguished_name
x509_extensions = ca_extensions
string_mask = utf8only
####################################################################
[ ca_distinguished_name ]
countryName = Country Name (2 letter code)
countryName_default = CN
stateOrProvinceName = State or Province Name (full name)
stateOrProvinceName_default = bj
localityName = Locality Name (eg, city)
localityName_default = bj
organizationName = Organization Name (eg, company)
organizationName_default = test-asm
organizationalUnitName = Organizational Unit (eg, division)
organizationalUnitName_default = R&D
commonName = Common Name (e.g. server FQDN or YOUR name)
commonName_default = Test CA
emailAddress = Email Address
emailAddress_default = test@example.com
####################################################################
[ ca_extensions ]
subjectKeyIdentifier = hash
authorityKeyIdentifier = keyid:always, issuer
basicConstraints = critical, CA:true
keyUsage = keyCertSign, cRLSign


#====All lines below are for signing other certs, not for making the CA cert.======

####################################################################
[ signing_policy ]
countryName = optional
stateOrProvinceName = optional
localityName = optional
organizationName = optional
organizationalUnitName = optional
commonName = supplied
emailAddress = optional
####################################################################
[ signing_req ]
subjectKeyIdentifier = hash
authorityKeyIdentifier = keyid,issuer
basicConstraints = CA:FALSE
keyUsage = digitalSignature, keyEncipherment

  2. 执行以下命令，生成根证书。

    openssl req -x509 -config ca.cnf -newkey rsa:4096 -sha256 -nodes -out cacert.pem -outform PEM

    此命令会输出cacert.pem和cakey.pem文件。

  3. 使用以下内容创建server.cnf文件，用于生成服务器证书。

    HOME = .
RANDFILE = $ENV::HOME/.rnd
####################################################################
[ req ]
default_bits = 2048
default_keyfile = serverkey.pem
distinguished_name = server_distinguished_name
req_extensions = server_req_extensions
string_mask = utf8only
####################################################################
[ server_distinguished_name ]
countryName = Country Name (2 letter code)
countryName_default = CN
stateOrProvinceName = State or Province Name (full name)
stateOrProvinceName_default = bj
localityName = Locality Name (eg, city)
localityName_default = bj
organizationName = Organization Name (eg, company)
organizationName_default = test
commonName = Common Name (e.g. server FQDN or YOUR name)
commonName_default = test.com
emailAddress = Email Address
emailAddress_default = test@example.com
####################################################################
[ server_req_extensions ]
subjectKeyIdentifier = hash
basicConstraints = CA:FALSE
keyUsage = digitalSignature, keyEncipherment
subjectAltName = @alternate_names
nsComment = "OpenSSL Generated Certificate"
####################################################################
[ alternate_names ]
DNS.1 = test.com

  4. 依次执行以下命令，生成服务器证书。

    openssl req -config server.cnf -newkey rsa:2048 -sha256 -nodes -out server.csr -outform PEM
    touch index.txt
echo '01' > serial.txt
    openssl ca -config ca.cnf -policy signing_policy -extensions signing_req -out servercert.pem -infiles server.csr

    此命令会输出servercert.pem和serverkey.pem。

  5. 使用以下内容创建client.cnf文件，用于创建客户端证书。

    HOME = .
RANDFILE = $ENV::HOME/.rnd
####################################################################
[ req ]
default_bits = 2048
default_keyfile = client.key.pem
distinguished_name = server_distinguished_name
req_extensions = server_req_extensions
string_mask = utf8only
####################################################################
[ server_distinguished_name ]
countryName = Country Name (2 letter code)
countryName_default = CN
stateOrProvinceName = State or Province Name (full name)
stateOrProvinceName_default = bj
localityName = Locality Name (eg, city)
localityName_default = bj
organizationName = Organization Name (eg, company)
organizationName_default = test.client
commonName = Common Name (e.g. server FQDN or YOUR name)
commonName_default = test.client
emailAddress = Email Address
emailAddress_default = test.client@example.com
####################################################################
[ server_req_extensions ]
subjectKeyIdentifier = hash
basicConstraints = CA:FALSE
keyUsage = digitalSignature, keyEncipherment
subjectAltName = @alternate_names
nsComment = "OpenSSL Generated Certificate"
####################################################################
[ alternate_names ]
URI.1 = spiffe://test.client

    客户端证书的CommonName为test.client，SAN信息中需要新增字段URI.1 = spiffe://test.client，这里需要额外加上spiffe://前缀，因为ASM的授权策略中principals字段会匹配spiffe://之后的部分。

  6. 依次执行以下命令，生成客户端证书。

    openssl req -config client.cnf -newkey rsa:2048 -sha256 -nodes -out clientcert.csr -outform PEM
    openssl ca -config ca.cnf -policy signing_policy -extensions signing_req -out clientcert.pem -infiles clientcert.csr

    此命令会输出clientcert.pem以及client.key.pem。

  7. 使用ASM证书管理导入mTLS证书，请确保此处导入的证书名称为test.com。具体操作，请参见使用ASM证书管理。

    您也可以使用kubectl直接创建secret来完成证书导入。使用数据面集群的kubeconfig，执行如下命令。

    kubectl create -n istio-system secret generic test.com \
  --from-file=tls.key=serverkey.pem \
  --from-file=tls.crt=servercert.pem \
  --from-file=ca.crt=cacert.pem

步骤二：在网关443端口上配置mTLS监听

本节将为ASM网关的443端口配置mTLS监听，让外部客户端可以通过mTLS访问httpbin服务。

  1. 使用以下内容，更新网关规则。

    apiVersion: networking.istio.io/v1beta1
kind: Gateway
metadata:
  name: httpbin
  namespace: default
spec:
  selector:
    istio: ingressgateway
  servers:
    - hosts:
        - '*'
      port:
        name: test
        number: 80
        protocol: HTTP
    - hosts:
      - test.com
      port:
        number: 443
        name: https
        protocol: HTTPS
      tls:
        mode: MUTUAL
        credentialName: test.com

  2. 执行以下命令，使用client证书访问httpbin服务。

    curl --header "host:test.com" --resolve "test.com:443:${ASM网关IP}" --cacert cacert.pem --cert clientcert.pem --key client.key.pem  https://test.com/status/200 -I

    预期输出：

    HTTP/2 200
server: istio-envoy
date: Sun, 28 Jul 2024 7:30:30 GMT
content-type: text/html; charset=utf-8
access-control-allow-origin: *
access-control-allow-credentials: true
content-length: 0
x-envoy-upstream-service-time: 6

步骤三：配置授权策略，限制test.client访问

  1. 使用以下内容，部署授权策略。限制test.client不能访问httpbin应用的/status/418路径。具体操作，请参见为HTTP流量设置授权策略。

    apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: test
  namespace: istio-system
spec:
  action: DENY
  rules:
    - from:
        - source:
            principals:
              - test.client
      to:
        - operation:
            paths:
              - /status/418
  selector:
    matchLabels:
      istio: ingressgateway

  2. 执行以下命令，使用client证书访问/status/200路径。

    curl --header "host:test.com" --resolve "test.com:443:${ASM网关IP}" --cacert cacert.pem --cert clientcert.pem --key client.key.pem  https://test.com/status/200 -I

    预期输出：

    HTTP/2 200
server: istio-envoy
date: Sun, 28 Jul 2024 7:33:30 GMT
content-type: text/html; charset=utf-8
access-control-allow-origin: *
access-control-allow-credentials: true
content-length: 0
x-envoy-upstream-service-time: 6

  3. 执行以下命令，使用client证书访问/status/418路径。

    curl --header "host:test.com" --resolve "test.com:443:${ASM网关IP}" --cacert cacert.pem --cert clientcert.pem --key client.key.pem  https://test.com/status/418

    预期输出：

    RBAC: access denied%

  4. 执行以下命令，使用server证书访问/status/418路径。

    curl --header "host:test.com" --resolve "test.com:443:${ASM网关IP}" --cacert cacert.pem --cert servercert.pem --key serverkey.pem  https://test.com/status/418

    预期输出：

        -=[ teapot ]=-

       _...._
     .'  _ _ `.
    | ."` ^ `". _,
    \_;`"---"`|//
      |       ;/
      \_     _/
        `"""`
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