fix(sdk): use case-insensitive comparison for Azure VM backup checks (#10417)

Co-authored-by: Hugo Pereira Brito <101209179+HugoPBrito@users.noreply.github.com>

prowler/CHANGELOG.md

@@ -2,6 +2,14 @@
 
 All notable changes to the **Prowler SDK** are documented in this file.
 
+## [5.21.2] (Prowler UNRELEASED)
+
+### 🐞 Fixed
+
+- Azure `vm_backup_enabled` and `vm_sufficient_daily_backup_retention_period` checks now compare VM names case-insensitively to avoid false negatives when Azure stores backup item names in a different case [(#10373)](https://github.com/prowler-cloud/prowler/pull/10373)
+
+---
+
 ## [5.21.0] (Prowler v5.21.0)
 
 ### 🚀 Added

prowler/providers/azure/services/vm/vm_backup_enabled/vm_backup_enabled.py

@@ -31,7 +31,8 @@ class vm_backup_enabled(Check):
                     for backup_item in vault.backup_protected_items.values():
                         if (
                             backup_item.workload_type == DataSourceType.VM
-                            and backup_item.name.split(";")[-1] == vm.resource_name
+                            and backup_item.name.split(";")[-1].lower()
+                            == vm.resource_name.lower()
                         ):
                             found = True
                             found_vault_name = vault.name

prowler/providers/azure/services/vm/vm_sufficient_daily_backup_retention_period/vm_sufficient_daily_backup_retention_period.py

@@ -27,7 +27,8 @@ class vm_sufficient_daily_backup_retention_period(Check):
                     for backup_item in vault.backup_protected_items.values():
                         if (
                             backup_item.workload_type == DataSourceType.VM
-                            and backup_item.name.split(";")[-1] == vm.resource_name
+                            and backup_item.name.split(";")[-1].lower()
+                            == vm.resource_name.lower()
                         ):
                             backup_found = True
                             policy_id = backup_item.backup_policy_id

tests/providers/azure/services/vm/vm_backup_enabled/vm_backup_enabled_test.py

@@ -221,6 +221,85 @@ class Test_vm_backup_enabled:
                 == f"VM {vm_name} in subscription {AZURE_SUBSCRIPTION_ID} is not protected by Azure Backup."
             )
 
+    def test_vm_protected_by_backup_case_insensitive(self):
+        vm_id = str(uuid4())
+        vm_name = "vmtest"
+        vault_id = str(uuid4())
+        vault_name = "vault1"
+        mock_vm_client = mock.MagicMock()
+        mock_recovery_client = mock.MagicMock()
+        with (
+            mock.patch(
+                "prowler.providers.common.provider.Provider.get_global_provider",
+                return_value=set_mocked_azure_provider(),
+            ),
+            mock.patch(
+                "prowler.providers.azure.services.vm.vm_backup_enabled.vm_backup_enabled.vm_client",
+                new=mock_vm_client,
+            ),
+            mock.patch(
+                "prowler.providers.azure.services.vm.vm_backup_enabled.vm_backup_enabled.recovery_client",
+                new=mock_recovery_client,
+            ),
+        ):
+            from azure.mgmt.recoveryservicesbackup.activestamp.models import (
+                DataSourceType,
+            )
+
+            from prowler.providers.azure.services.recovery.recovery_service import (
+                BackupItem,
+                BackupVault,
+            )
+            from prowler.providers.azure.services.vm.vm_backup_enabled.vm_backup_enabled import (
+                vm_backup_enabled,
+            )
+            from prowler.providers.azure.services.vm.vm_service import (
+                ManagedDiskParameters,
+                OSDisk,
+                StorageProfile,
+                VirtualMachine,
+            )
+
+            vm = VirtualMachine(
+                resource_id=vm_id,
+                resource_name=vm_name,
+                location="eastus",
+                security_profile=None,
+                extensions=[],
+                storage_profile=StorageProfile(
+                    os_disk=OSDisk(
+                        name="os_disk_name",
+                        operating_system_type="Linux",
+                        managed_disk=ManagedDiskParameters(id="managed_disk_id"),
+                    ),
+                    data_disks=[],
+                ),
+            )
+            backup_item = BackupItem(
+                id=str(uuid4()),
+                name="someprefix;VMTEST",
+                workload_type=DataSourceType.VM,
+            )
+            vault = BackupVault(
+                id=vault_id,
+                name=vault_name,
+                location="eastus",
+                backup_protected_items={backup_item.id: backup_item},
+            )
+            mock_vm_client.virtual_machines = {AZURE_SUBSCRIPTION_ID: {vm_id: vm}}
+            mock_recovery_client.vaults = {AZURE_SUBSCRIPTION_ID: {vault_id: vault}}
+            check = vm_backup_enabled()
+            result = check.execute()
+            assert len(result) == 1
+            assert result[0].status == "PASS"
+            assert result[0].subscription == AZURE_SUBSCRIPTION_ID
+            assert result[0].resource_name == vm_name
+            assert result[0].resource_id == vm_id
+            assert (
+                result[0].status_extended
+                == f"VM {vm_name} in subscription {AZURE_SUBSCRIPTION_ID} is protected by Azure Backup (vault: {vault_name})."
+            )
+
     def test_vm_protected_by_backup_non_vm_workload(self):
         vm_id = str(uuid4())
         vm_name = "VMTest"

tests/providers/azure/services/vm/vm_sufficient_daily_backup_retention_period/vm_sufficient_daily_backup_retention_period_test.py

@@ -156,6 +156,100 @@ class Test_vm_sufficient_daily_backup_retention_period:
                 in result[0].status_extended
             )
 
+    def test_vm_with_sufficient_retention_case_insensitive(self):
+        from azure.mgmt.recoveryservicesbackup.activestamp.models import DataSourceType
+
+        from prowler.providers.azure.services.recovery.recovery_service import (
+            BackupItem,
+            BackupPolicy,
+            BackupVault,
+        )
+        from prowler.providers.azure.services.vm.vm_service import (
+            ManagedDiskParameters,
+            OSDisk,
+            StorageProfile,
+            VirtualMachine,
+        )
+
+        vm_id = str(uuid4())
+        vm_name = "vmtest"
+        vault_id = str(uuid4())
+        policy_id = str(uuid4())
+        retention_days = 14
+        min_retention_days = 7
+
+        vm = VirtualMachine(
+            resource_id=vm_id,
+            resource_name=vm_name,
+            location="eastus",
+            security_profile=None,
+            extensions=[],
+            storage_profile=StorageProfile(
+                os_disk=OSDisk(
+                    name="os_disk_name",
+                    operating_system_type="Linux",
+                    managed_disk=ManagedDiskParameters(id="managed_disk_id"),
+                ),
+                data_disks=[],
+            ),
+        )
+        backup_item = BackupItem(
+            id=str(uuid4()),
+            name="someprefix;VMTEST",
+            workload_type=DataSourceType.VM,
+            backup_policy_id=policy_id,
+        )
+        backup_policy = BackupPolicy(
+            id=policy_id,
+            name="policy1",
+            retention_days=retention_days,
+        )
+        vault = BackupVault(
+            id=vault_id,
+            name="vault1",
+            location="eastus",
+            backup_protected_items={backup_item.id: backup_item},
+            backup_policies={policy_id: backup_policy},
+        )
+        vm_client = mock.MagicMock()
+        recovery_client = mock.MagicMock()
+        vm_client.virtual_machines = {AZURE_SUBSCRIPTION_ID: {vm_id: vm}}
+        recovery_client.vaults = {AZURE_SUBSCRIPTION_ID: {vault_id: vault}}
+        vm_client.audit_config = {
+            "vm_backup_min_daily_retention_days": min_retention_days
+        }
+        with (
+            mock.patch(
+                "prowler.providers.common.provider.Provider.get_global_provider",
+                return_value=set_mocked_azure_provider(
+                    audit_config=vm_client.audit_config
+                ),
+            ),
+            mock.patch(
+                "prowler.providers.azure.services.vm.vm_sufficient_daily_backup_retention_period.vm_sufficient_daily_backup_retention_period.vm_client",
+                new=vm_client,
+            ),
+            mock.patch(
+                "prowler.providers.azure.services.vm.vm_sufficient_daily_backup_retention_period.vm_sufficient_daily_backup_retention_period.recovery_client",
+                new=recovery_client,
+            ),
+        ):
+            from prowler.providers.azure.services.vm.vm_sufficient_daily_backup_retention_period.vm_sufficient_daily_backup_retention_period import (
+                vm_sufficient_daily_backup_retention_period,
+            )
+
+            check = vm_sufficient_daily_backup_retention_period()
+            result = check.execute()
+            assert len(result) == 1
+            assert result[0].status == "PASS"
+            assert result[0].subscription == AZURE_SUBSCRIPTION_ID
+            assert result[0].resource_name == vm_name
+            assert result[0].resource_id == vm_id
+            assert (
+                f"has a daily backup retention period of {retention_days} days"
+                in result[0].status_extended
+            )
+
     def test_vm_with_insufficient_retention(self):
         from azure.mgmt.recoveryservicesbackup.activestamp.models import DataSourceType