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Use secure ciphers for API Management#

Security · API Management · Rule · 2022_03 · Critical

API Management should not accept weak or deprecated ciphers for client or backend communication.

Description#

API Management provides support for weak or deprecated ciphers. These older versions are provided for compatibility with clients and backends but are not consider secure. These many of these ciphers are enabled by default and need to be set to 'False'.

The following ciphers are considered weak or deprecated:

  • TripleDes168
  • TLS_RSA_WITH_AES_128_CBC_SHA
  • TLS_RSA_WITH_AES_256_CBC_SHA
  • TLS_RSA_WITH_AES_128_CBC_SHA256
  • TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
  • TLS_RSA_WITH_AES_256_CBC_SHA256
  • TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
  • TLS_RSA_WITH_AES_128_GCM_SHA256

Recommendation#

Consider disabling weak or deprecated ciphers from API Management Services. Also consider disabling weak or deprecated protocols.

Examples#

Configure with Azure template#

To deploy API Management Services that pass this rule:

  • Set the following keys to "False" (as a string) within the properties.customProperties property:
    • Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TripleDes168
    • Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TLS_RSA_WITH_AES_128_CBC_SHA
    • Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TLS_RSA_WITH_AES_256_CBC_SHA
    • Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TLS_RSA_WITH_AES_128_CBC_SHA256
    • Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
    • Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TLS_RSA_WITH_AES_256_CBC_SHA256
    • Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
    • Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TLS_RSA_WITH_AES_128_GCM_SHA256

For example:

Azure Template snippet
{
    "type": "Microsoft.ApiManagement/service",
    "apiVersion": "2021-08-01",
    "name": "[parameters('name')]",
    "location": "[parameters('location')]",
    "sku": {
        "name": "Premium",
        "capacity": 1
    },
    "identity": {
        "type": "SystemAssigned"
    },
    "properties": {
        "publisherEmail": "[parameters('publisherEmail')]",
        "publisherName": "[parameters('publisherName')]",
        "customProperties": {
            "Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Protocols.Tls10": "False",
            "Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Protocols.Tls11": "False",
            "Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Protocols.Ssl30": "False",
            "Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Backend.Protocols.Tls10": "False",
            "Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Backend.Protocols.Tls11": "False",
            "Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Backend.Protocols.Ssl30": "False",
            "Microsoft.WindowsAzure.ApiManagement.Gateway.Protocols.Server.Http2": "True",
            "Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TripleDes168": "False",
            "Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TLS_RSA_WITH_AES_128_CBC_SHA": "False",
            "Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TLS_RSA_WITH_AES_256_CBC_SHA": "False",
            "Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TLS_RSA_WITH_AES_128_CBC_SHA256": "False",
            "Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA": "False",
            "Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TLS_RSA_WITH_AES_256_CBC_SHA256": "False",
            "Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA": "False",
            "Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TLS_RSA_WITH_AES_128_GCM_SHA256": "False"
        },
        "apiVersionConstraint": {
            "minApiVersion": "2021-08-01"
        }
    }
}

Configure with Bicep#

To deploy API Management Services that pass this rule:

  • Set the following keys to 'False' (as a string) within the properties.customProperties property:
    • Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TripleDes168
    • Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TLS_RSA_WITH_AES_128_CBC_SHA
    • Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TLS_RSA_WITH_AES_256_CBC_SHA
    • Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TLS_RSA_WITH_AES_128_CBC_SHA256
    • Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
    • Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TLS_RSA_WITH_AES_256_CBC_SHA256
    • Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
    • Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TLS_RSA_WITH_AES_128_GCM_SHA256

For example:

Azure Bicep snippet
resource service 'Microsoft.ApiManagement/service@2021-08-01' = {
  name: name
  location: location
  sku: {
    name: 'Premium'
    capacity: 1
  }
  identity: {
    type: 'SystemAssigned'
  }
  properties: {
    publisherEmail: publisherEmail
    publisherName: publisherName
    customProperties: {
      'Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Protocols.Tls10': 'False'
      'Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Protocols.Tls11': 'False'
      'Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Protocols.Ssl30': 'False'
      'Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Backend.Protocols.Tls10': 'False'
      'Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Backend.Protocols.Tls11': 'False'
      'Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Backend.Protocols.Ssl30': 'False'
      'Microsoft.WindowsAzure.ApiManagement.Gateway.Protocols.Server.Http2': 'True'
      'Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TripleDes168': 'False'
      'Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TLS_RSA_WITH_AES_128_CBC_SHA': 'False'
      'Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TLS_RSA_WITH_AES_256_CBC_SHA': 'False'
      'Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TLS_RSA_WITH_AES_128_CBC_SHA256': 'False'
      'Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA': 'False'
      'Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TLS_RSA_WITH_AES_256_CBC_SHA256': 'False'
      'Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA': 'False'
      'Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TLS_RSA_WITH_AES_128_GCM_SHA256': 'False'
    }
    apiVersionConstraint: {
      minApiVersion: '2021-08-01'
    }
  }
}

Configure with Azure Verified Modules

A pre-validated module supported by Microsoft is available from the Azure Bicep public registry. To reference the module, please use the following syntax:

br/public:avm/res/api-management/service:<version>

To use the latest version:

br/public:avm/res/api-management/service:0.9.1

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