HTTPSと認証

Alertmanagerは基本認証とTLSをサポートしています。これは**実験的**であり、将来変更される可能性があります。

現在、TLSはHTTPトラフィックとゴシップトラフィックでサポートされています。

HTTPトラフィック

読み込むウェブ設定ファイルを指定するには、--web.config.fileフラグを使用します。

ファイルはYAML形式で記述されており、以下に説明するスキームで定義されています。角括弧はパラメータがオプションであることを示します。リストではないパラメータの場合、値は指定されたデフォルトに設定されます。

ファイルはHTTPリクエストごとに読み込まれ、設定や証明書の変更は即座に反映されます。

一般的なプレースホルダは次のように定義されます

<boolean>: trueまたはfalseの値をとることができるブール値
<filename>: 現在の作業ディレクトリ内の有効なパス
<secret>: パスワードなどの秘密の通常の文字列
<string>: 通常の文字列

tls_server_config:
  # Certificate and key files for server to use to authenticate to client.
  cert_file: <filename>
  key_file: <filename>

  # Server policy for client authentication. Maps to ClientAuth Policies.
  # For more detail on clientAuth options:
  # https://go.dokyumento.jp/pkg/crypto/tls/#ClientAuthType
  #
  # NOTE: If you want to enable client authentication, you need to use
  # RequireAndVerifyClientCert. Other values are insecure.
  [ client_auth_type: <string> | default = "NoClientCert" ]

  # CA certificate for client certificate authentication to the server.
  [ client_ca_file: <filename> ]

  # Minimum TLS version that is acceptable.
  [ min_version: <string> | default = "TLS12" ]

  # Maximum TLS version that is acceptable.
  [ max_version: <string> | default = "TLS13" ]

  # List of supported cipher suites for TLS versions up to TLS 1.2. If empty,
  # Go default cipher suites are used. Available cipher suites are documented
  # in the go documentation:
  # https://go.dokyumento.jp/pkg/crypto/tls/#pkg-constants
  #
  # Note that only the cipher returned by the following function are supported:
  # https://pkg.go.dev/crypto/tls#CipherSuites
  [ cipher_suites:
    [ - <string> ] ]

  # prefer_server_cipher_suites controls whether the server selects the
  # client's most preferred ciphersuite, or the server's most preferred
  # ciphersuite. If true then the server's preference, as expressed in
  # the order of elements in cipher_suites, is used.
  [ prefer_server_cipher_suites: <bool> | default = true ]

  # Elliptic curves that will be used in an ECDHE handshake, in preference
  # order. Available curves are documented in the go documentation:
  # https://go.dokyumento.jp/pkg/crypto/tls/#CurveID
  [ curve_preferences:
    [ - <string> ] ]

http_server_config:
  # Enable HTTP/2 support. Note that HTTP/2 is only supported with TLS.
  # This can not be changed on the fly.
  [ http2: <boolean> | default = true ]
  # List of headers that can be added to HTTP responses.
  [ headers:
    # Set the Content-Security-Policy header to HTTP responses.
    # Unset if blank.
    [ Content-Security-Policy: <string> ]
    # Set the X-Frame-Options header to HTTP responses.
    # Unset if blank. Accepted values are deny and sameorigin.
    # https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Frame-Options
    [ X-Frame-Options: <string> ]
    # Set the X-Content-Type-Options header to HTTP responses.
    # Unset if blank. Accepted value is nosniff.
    # https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Content-Type-Options
    [ X-Content-Type-Options: <string> ]
    # Set the X-XSS-Protection header to all responses.
    # Unset if blank.
    # https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-XSS-Protection
    [ X-XSS-Protection: <string> ]
    # Set the Strict-Transport-Security header to HTTP responses.
    # Unset if blank.
    # Please make sure that you use this with care as this header might force
    # browsers to load Prometheus and the other applications hosted on the same
    # domain and subdomains over HTTPS.
    # https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Strict-Transport-Security
    [ Strict-Transport-Security: <string> ] ]

# Usernames and hashed passwords that have full access to the web
# server via basic authentication. If empty, no basic authentication is
# required. Passwords are hashed with bcrypt.
basic_auth_users:
  [ <string>: <secret> ... ]

ゴシップトラフィック

ゴシップに相互TLSを使用するかどうかを指定するには、--cluster.tls-configフラグを使用します。

ゴシップのサーバー側とクライアント側は設定可能です。

tls_server_config:
  # Certificate and key files for server to use to authenticate to client.
  cert_file: <filename>
  key_file: <filename>

  # Server policy for client authentication. Maps to ClientAuth Policies.
  # For more detail on clientAuth options:
  # https://go.dokyumento.jp/pkg/crypto/tls/#ClientAuthType
  [ client_auth_type: <string> | default = "NoClientCert" ]

  # CA certificate for client certificate authentication to the server.
  [ client_ca_file: <filename> ]

  # Minimum TLS version that is acceptable.
  [ min_version: <string> | default = "TLS12" ]

  # Maximum TLS version that is acceptable.
  [ max_version: <string> | default = "TLS13" ]

  # List of supported cipher suites for TLS versions up to TLS 1.2. If empty,
  # Go default cipher suites are used. Available cipher suites are documented
  # in the go documentation:
  # https://go.dokyumento.jp/pkg/crypto/tls/#pkg-constants
  [ cipher_suites:
    [ - <string> ] ]

  # prefer_server_cipher_suites controls whether the server selects the
  # client's most preferred ciphersuite, or the server's most preferred
  # ciphersuite. If true then the server's preference, as expressed in
  # the order of elements in cipher_suites, is used.
  [ prefer_server_cipher_suites: <bool> | default = true ]

  # Elliptic curves that will be used in an ECDHE handshake, in preference
  # order. Available curves are documented in the go documentation:
  # https://go.dokyumento.jp/pkg/crypto/tls/#CurveID
  [ curve_preferences:
    [ - <string> ] ]

tls_client_config:
  # Path to the CA certificate with which to validate the server certificate.
  [ ca_file: <filepath> ]
    
  # Certificate and key files for client cert authentication to the server.
  [ cert_file: <filepath> ]
  [ key_file: <filepath> ]
  
  # Server name extension to indicate the name of the server.
  # http://tools.ietf.org/html/rfc4366#section-3.1
  [ server_name: <string> ]
  
  # Disable validation of the server certificate.
  [ insecure_skip_verify: <boolean> | default = false]

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