Didacticiel IAM : utiliser un modèle CloudFormation pour créer un fournisseur d’identité (IdP) SAML et un rôle IAM fédéré SAML

{
  "AWSTemplateFormatVersion": "2010-09-09",
  "Description": "[AWSDocs] IAM: tutorial_saml-idp-and-federated-role",
  "Parameters": {
    "IdentityProviderName": {
      "Type": "String",
      "Description": "Name of the SAML Identity Provider (leave empty for auto-generated name like '{StackName}-{UniqueId}')",
      "Default": "",
      "AllowedPattern": "^$|^[a-zA-Z0-9._-]+$",
      "ConstraintDescription": "Must be empty or contain only alphanumeric characters, periods, underscores, and hyphens"
    },
    "IdentityProviderSAMLMetadataDocument": {
      "Type": "String",
      "Description": "SAML metadata document from identity provider"
    },
    "IdentityProviderAddPrivateKey": {
      "Type": "String",
      "Description": "Optional private key for decrypting SAML assertions. The private key must be a .pem file that uses AES-GCM or AES-CBC encryption algorithm to decrypt SAML assertions.",
      "Default": ""
    },
    "IdentityProviderAssertionEncryptionMode": {
      "Type": "String",
      "Description": "Optional, sets encryption mode for SAML assertions",
      "Default": "",
      "AllowedValues": ["", "Allowed", "Required"]
    },
    "RoleName": {
      "Type": "String",
      "Description": "Name of the IAM Role (leave empty for auto-generated name like '{StackName}-{UniqueId}')",
      "Default": "",
      "AllowedPattern": "^$|^[\\w+=,.@-]{1,64}$",
      "ConstraintDescription": "Must be empty or 1-64 characters and can contain alphanumeric characters and +=,.@-"
    },
    "RolePath": {
      "Type": "String",
      "Description": "Path for the IAM Role",
      "AllowedPattern": "(^\\/$)|(^\\/.*\\/$)",
      "Default": "/"
    },
    "RolePermissionsBoundary": {
      "Type": "String",
      "Description": "Optional ARN of the permissions boundary policy (leave empty for none)",
      "Default": ""
    },
    "RoleSessionDuration": {
      "Description": "The maximum session duration (in seconds) that you want to set for the specified role (3600-43200)",
      "Type": "Number",
      "MinValue": 3600,
      "MaxValue": 43200,
      "Default": 7200
    },
    "RoleManagedPolicy1": {
      "Type": "String",
      "Description": "Optional managed policy ARN 1",
      "Default": ""
    },
    "RoleManagedPolicy2": {
      "Type": "String",
      "Description": "Optional managed policy ARN 2",
      "Default": ""
    },
    "RoleManagedPolicy3": {
      "Type": "String",
      "Description": "Optional managed policy ARN 3",
      "Default": ""
    },
    "RoleManagedPolicy4": {
      "Type": "String",
      "Description": "Optional managed policy ARN 4",
      "Default": ""
    },
    "RoleManagedPolicy5": {
      "Type": "String",
      "Description": "Optional managed policy ARN 5",
      "Default": ""
    }
  },
  "Conditions": {
    "HasCustomProviderName": {"Fn::Not": [{"Fn::Equals": [{"Ref": "IdentityProviderName"}, ""]}]},
    "HasCustomRoleName": {"Fn::Not": [{"Fn::Equals": [{"Ref": "RoleName"}, ""]}]},
    "HasPermissionsBoundary": {"Fn::Not": [{"Fn::Equals": [{"Ref": "RolePermissionsBoundary"}, ""]}]},
    "HasPolicy1": {"Fn::Not": [{"Fn::Equals": [{"Ref": "RoleManagedPolicy1"}, ""]}]},
    "HasPolicy2": {"Fn::Not": [{"Fn::Equals": [{"Ref": "RoleManagedPolicy2"}, ""]}]},
    "HasPolicy3": {"Fn::Not": [{"Fn::Equals": [{"Ref": "RoleManagedPolicy3"}, ""]}]},
    "HasPolicy4": {"Fn::Not": [{"Fn::Equals": [{"Ref": "RoleManagedPolicy4"}, ""]}]},
    "HasPolicy5": {"Fn::Not": [{"Fn::Equals": [{"Ref": "RoleManagedPolicy5"}, ""]}]},
    "HasPrivateKey": {"Fn::Not": [{"Fn::Equals": [{"Ref": "IdentityProviderAddPrivateKey"}, ""]}]},
    "HasAssertionEncryptionMode": {"Fn::Not": [{"Fn::Equals": [{"Ref": "IdentityProviderAssertionEncryptionMode"}, ""]}]}
  },
  "Resources": {
    "SAMLProvider": {
      "Type": "AWS::IAM::SAMLProvider",
      "Properties": {
        "Name": {"Fn::If": ["HasCustomProviderName", {"Ref": "IdentityProviderName"}, {"Ref": "AWS::NoValue"}]},
        "SamlMetadataDocument": {"Ref": "IdentityProviderSAMLMetadataDocument"},
        "AddPrivateKey": {"Fn::If": ["HasPrivateKey", {"Ref": "IdentityProviderAddPrivateKey"}, {"Ref": "AWS::NoValue"}]},
        "AssertionEncryptionMode": {"Fn::If": ["HasAssertionEncryptionMode", {"Ref": "IdentityProviderAssertionEncryptionMode"}, {"Ref": "AWS::NoValue"}]}
      }
    },
    "SAMLFederatedRole": {
      "Type": "AWS::IAM::Role",
      "Properties": {
        "RoleName": {"Fn::If": ["HasCustomRoleName", {"Ref": "RoleName"}, {"Ref": "AWS::NoValue"}]},
        "Path": {"Ref": "RolePath"},
        "Description": "SAML federated IAM role for SSO access with specified permissions",
        "MaxSessionDuration": {"Ref": "RoleSessionDuration"},
        "PermissionsBoundary": {"Fn::If": ["HasPermissionsBoundary", {"Ref": "RolePermissionsBoundary"}, {"Ref": "AWS::NoValue"}]},
        "AssumeRolePolicyDocument": {
          "Version": "2012-10-17",		 	 	 
          "Statement": [
            {
              "Effect": "Allow",
              "Principal": {
                "Federated": {"Ref": "SAMLProvider"}
              },
              "Action": [
                "sts:AssumeRole",
                "sts:SetSourceIdentity",
                "sts:TagSession"
              ],
              "Condition": {
                "StringEquals": {
                  "SAML:aud": "https://signin.aws.amazon.com/saml"
                }
              }
            }
          ]
        },
        "ManagedPolicyArns": {
          "Fn::Split": [
            ",",
            {
              "Fn::Join": [
                ",",
                [
                  {"Fn::If": ["HasPolicy1", {"Ref": "RoleManagedPolicy1"}, {"Ref": "AWS::NoValue"}]},
                  {"Fn::If": ["HasPolicy2", {"Ref": "RoleManagedPolicy2"}, {"Ref": "AWS::NoValue"}]},
                  {"Fn::If": ["HasPolicy3", {"Ref": "RoleManagedPolicy3"}, {"Ref": "AWS::NoValue"}]},
                  {"Fn::If": ["HasPolicy4", {"Ref": "RoleManagedPolicy4"}, {"Ref": "AWS::NoValue"}]},
                  {"Fn::If": ["HasPolicy5", {"Ref": "RoleManagedPolicy5"}, {"Ref": "AWS::NoValue"}]}
                ]
              ]
            }
          ]
        }
      }
    }
  },
  "Outputs": {
    "RoleARN": {
      "Description": "ARN of the created IAM Role",
      "Value": {"Fn::GetAtt": ["SAMLFederatedRole", "Arn"]},
      "Export": {
        "Name": {"Fn::Sub": "${AWS::StackName}-RoleARN"}
      }
    },
    "IdentityProviderARN": {
      "Description": "ARN of the created SAML Identity Provider",
      "Value": {"Ref": "SAMLProvider"},
      "Export": {
        "Name": {"Fn::Sub": "${AWS::StackName}-IdentityProviderARN"}
      }
    }
  }
}

AWSTemplateFormatVersion: '2010-09-09'
Description: '[AWSDocs] IAM: tutorial_saml-idp-and-federated-role'

Parameters:
  IdentityProviderName:
    Type: String
    Description: Name of the SAML Identity Provider (leave empty for auto-generated name like '{StackName}-{UniqueId}')
    Default: ""
    AllowedPattern: '^$|^[a-zA-Z0-9._-]+$'
    ConstraintDescription: Must be empty or contain only alphanumeric characters, periods, underscores, and hyphens

  IdentityProviderSAMLMetadataDocument:
    Type: String
    Description: SAML metadata document from identity provider

  IdentityProviderAddPrivateKey:
    Type: String
    Description: Optional private key for decrypting SAML assertions. The private key must be a .pem file that uses AES-GCM or AES-CBC encryption algorithm to decrypt SAML assertions.
    Default: ""

  IdentityProviderAssertionEncryptionMode:
    Type: String
    Description: Optional, sets encryption mode for SAML assertions
    Default: ""
    AllowedValues:
      - ""
      - "Allowed"
      - "Required"

  RoleName:
    Type: String
    Description: Name of the IAM Role (leave empty for auto-generated name like '{StackName}-{UniqueId}')
    Default: ""
    AllowedPattern: '^$|^[\w+=,.@-]{1,64}$'
    ConstraintDescription: "Must be empty or 1-64 characters and can contain alphanumeric characters and +=,.@-"

  RolePath:
    Type: String
    Description: Path for the IAM Role
    AllowedPattern: (^\/$)|(^\/.*\/$)
    Default: "/"

  RolePermissionsBoundary:
    Type: String
    Description: Optional ARN of the permissions boundary policy (leave empty for none)
    Default: ""
    
  RoleSessionDuration:
    Description: The maximum session duration (in seconds) that you want to set for the specified role (3600-43200)
    Type: Number
    MinValue: 3600
    MaxValue: 43200
    Default: 7200

  RoleManagedPolicy1:
    Type: String
    Description: Optional managed policy ARN 1
    Default: ""
  RoleManagedPolicy2:
    Type: String
    Description: Optional managed policy ARN 2
    Default: ""
  RoleManagedPolicy3:
    Type: String
    Description: Optional managed policy ARN 3
    Default: ""
  RoleManagedPolicy4:
    Type: String
    Description: Optional managed policy ARN 4
    Default: ""
  RoleManagedPolicy5:
    Type: String
    Description: Optional managed policy ARN 5
    Default: ""

Conditions:
  HasCustomProviderName: !Not [!Equals [!Ref IdentityProviderName, ""]]
  HasCustomRoleName: !Not [!Equals [!Ref RoleName, ""]]
  HasPermissionsBoundary: !Not [!Equals [!Ref RolePermissionsBoundary, ""]]
  HasPolicy1: !Not [!Equals [!Ref RoleManagedPolicy1, ""]]
  HasPolicy2: !Not [!Equals [!Ref RoleManagedPolicy2, ""]]
  HasPolicy3: !Not [!Equals [!Ref RoleManagedPolicy3, ""]]
  HasPolicy4: !Not [!Equals [!Ref RoleManagedPolicy4, ""]]
  HasPolicy5: !Not [!Equals [!Ref RoleManagedPolicy5, ""]]
  HasPrivateKey: !Not [!Equals [!Ref IdentityProviderAddPrivateKey, ""]]
  HasAssertionEncryptionMode: !Not [!Equals [!Ref IdentityProviderAssertionEncryptionMode, ""]]

Resources:
  SAMLProvider:
    Type: AWS::IAM::SAMLProvider
    Properties:
      Name: !If
        - HasCustomProviderName
        - !Ref IdentityProviderName
        - !Ref AWS::NoValue
      SamlMetadataDocument: !Ref IdentityProviderSAMLMetadataDocument
      AddPrivateKey: !If
        - HasPrivateKey
        - !Ref IdentityProviderAddPrivateKey
        - !Ref AWS::NoValue
      AssertionEncryptionMode: !If
        - HasAssertionEncryptionMode
        - !Ref IdentityProviderAssertionEncryptionMode
        - !Ref AWS::NoValue

  SAMLFederatedRole:
    Type: AWS::IAM::Role
    Properties:
      RoleName: !If
        - HasCustomRoleName
        - !Ref RoleName
        - !Ref AWS::NoValue
      Path: !Ref RolePath
      Description: "SAML federated IAM role for SSO access with specified permissions"
      MaxSessionDuration: !Ref RoleSessionDuration
      PermissionsBoundary: !If
        - HasPermissionsBoundary
        - !Ref RolePermissionsBoundary
        - !Ref AWS::NoValue
      AssumeRolePolicyDocument:
        Version: '2012-10-17		 	 	 '
        Statement:
          - Effect: Allow
            Principal:
              Federated: !Ref SAMLProvider
            Action:
              - 'sts:AssumeRole'
              - 'sts:SetSourceIdentity'
              - 'sts:TagSession'
            Condition:
              StringEquals:
                'SAML:aud': 'https://signin.aws.amazon.com/saml'
      ManagedPolicyArns: !Split
        - ','
        - !Join
          - ','
          - - !If [HasPolicy1, !Ref RoleManagedPolicy1, !Ref "AWS::NoValue"]
            - !If [HasPolicy2, !Ref RoleManagedPolicy2, !Ref "AWS::NoValue"]
            - !If [HasPolicy3, !Ref RoleManagedPolicy3, !Ref "AWS::NoValue"]
            - !If [HasPolicy4, !Ref RoleManagedPolicy4, !Ref "AWS::NoValue"]
            - !If [HasPolicy5, !Ref RoleManagedPolicy5, !Ref "AWS::NoValue"]

Outputs:
  RoleARN:
    Description: ARN of the created IAM Role
    Value: !GetAtt SAMLFederatedRole.Arn
    Export:
      Name: !Sub '${AWS::StackName}-RoleARN'

  IdentityProviderARN:
    Description: ARN of the created SAML Identity Provider
    Value: !Ref SAMLProvider
    Export:
      Name: !Sub '${AWS::StackName}-IdentityProviderARN'