associate subnets with NSG (#1393)

* associate subnets with NSG

change NSG rule protocol to ANY

* subnet wait

* Improve NSG update logic

validate that subnet nsg is set before getting it's id (#1409)

Co-authored-by: stas <statis@microsoft.com>

src/api-service/__app__/instance_config/__init__.py

@@ -3,16 +3,17 @@
 # Copyright (c) Microsoft Corporation.
 # Licensed under the MIT License.
 
+import logging
+
 import azure.functions as func
 from onefuzztypes.enums import ErrorCode
 from onefuzztypes.models import Error
 from onefuzztypes.requests import InstanceConfigUpdate
 
-from ..onefuzzlib.azure.nsg import set_allowed
+from ..onefuzzlib.azure.nsg import is_one_fuzz_nsg, list_nsgs, set_allowed
 from ..onefuzzlib.config import InstanceConfig
 from ..onefuzzlib.endpoint_authorization import call_if_user, can_modify_config
 from ..onefuzzlib.request import not_ok, ok, parse_request
-from ..onefuzzlib.workers.scalesets import Scaleset
 
 
 def get(req: func.HttpRequest) -> func.HttpResponse:
@@ -46,15 +47,21 @@ def post(req: func.HttpRequest) -> func.HttpResponse:
 
     # Update All NSGs
     if update_nsg:
-        scalesets = Scaleset.search()
-        regions = set(x.region for x in scalesets)
-        for region in regions:
-            result = set_allowed(region, request.config.proxy_nsg_config)
+        nsgs = list_nsgs()
+        for nsg in nsgs:
+            logging.info(
+                "Checking if nsg: %s (%s) owned by OneFuzz" % (nsg.location, nsg.name)
+            )
+            if is_one_fuzz_nsg(nsg.location, nsg.name):
+                result = set_allowed(nsg.location, request.config.proxy_nsg_config)
                 if isinstance(result, Error):
                     return not_ok(
                         Error(
                             code=ErrorCode.UNABLE_TO_CREATE,
-                        errors=["Unable to update nsg %s due to %s" % (region, result)],
+                            errors=[
+                                "Unable to update nsg %s due to %s"
+                                % (nsg.location, result)
+                            ],
                         ),
                         context="instance_config_update",
                     )

src/api-service/__app__/onefuzzlib/azure/ip.py

@@ -5,10 +5,11 @@
 
 import logging
 import os
-from typing import Any, Dict, Optional, Union
+from typing import Any, Dict, Optional, Union, cast
 from uuid import UUID
 
 from azure.core.exceptions import ResourceNotFoundError
+from azure.mgmt.network.models import Subnet
 from msrestazure.azure_exceptions import CloudError
 from msrestazure.tools import parse_resource_id
 from onefuzztypes.enums import ErrorCode
@@ -18,6 +19,7 @@ from onefuzztypes.primitives import Region
 from .creds import get_base_resource_group
 from .network import Network
 from .network_mgmt_client import get_network_client
+from .nsg import NSG
 from .vmss import get_instance_id
 
 
@@ -95,7 +97,7 @@ def delete_nic(resource_group: str, name: str) -> Optional[Any]:
 
 
 def create_public_nic(
-    resource_group: str, name: str, region: Region
+    resource_group: str, name: str, region: Region, nsg: Optional[NSG]
 ) -> Optional[Error]:
     logging.info("creating nic for %s:%s in %s", resource_group, name, region)
 
@@ -105,6 +107,14 @@ def create_public_nic(
         network.create()
         return None
 
+    if nsg:
+        subnet = cast(Subnet, network.get_subnet())
+        if not subnet.network_security_group:
+            result = nsg.associate_subnet(network.get_vnet(), subnet)
+            if isinstance(result, Error):
+                return result
+            return None
+
     ip = get_ip(resource_group, name)
     if not ip:
         create_ip(resource_group, name, region)

src/api-service/__app__/onefuzzlib/azure/network.py

@@ -7,6 +7,7 @@ import logging
 import uuid
 from typing import Optional, Union
 
+from azure.mgmt.network.models import Subnet, VirtualNetwork
 from msrestazure.azure_exceptions import CloudError
 from onefuzztypes.enums import ErrorCode
 from onefuzztypes.models import Error, NetworkConfig
@@ -14,7 +15,7 @@ from onefuzztypes.primitives import Region
 
 from ..config import InstanceConfig
 from .creds import get_base_resource_group
-from .subnet import create_virtual_network, get_subnet_id
+from .subnet import create_virtual_network, get_subnet, get_subnet_id, get_vnet
 
 # This was generated randomly and should be preserved moving forwards
 NETWORK_GUID_NAMESPACE = uuid.UUID("372977ad-b533-416a-b1b4-f770898e0b11")
@@ -51,6 +52,12 @@ class Network:
     def get_id(self) -> Optional[str]:
         return get_subnet_id(self.group, self.name, self.name)
 
+    def get_subnet(self) -> Optional[Subnet]:
+        return get_subnet(self.group, self.name, self.name)
+
+    def get_vnet(self) -> Optional[VirtualNetwork]:
+        return get_vnet(self.group, self.name)
+
     def create(self) -> Union[None, Error]:
         if not self.exists():
             result = create_virtual_network(

src/api-service/__app__/onefuzzlib/azure/nsg.py

@@ -13,7 +13,8 @@ from azure.mgmt.network.models import (
     NetworkSecurityGroup,
     SecurityRule,
     SecurityRuleAccess,
-    SecurityRuleProtocol,
+    Subnet,
+    VirtualNetwork,
 )
 from msrestazure.azure_exceptions import CloudError
 from onefuzztypes.enums import ErrorCode
@@ -105,6 +106,10 @@ def ok_to_delete(active_regions: Set[Region], nsg_region: str, nsg_name: str) ->
     return nsg_region not in active_regions and nsg_region == nsg_name
 
 
+def is_one_fuzz_nsg(nsg_region: str, nsg_name: str) -> bool:
+    return nsg_region == nsg_name
+
+
 def delete_nsg(name: str) -> bool:
     # NSG can be only deleted if no other resource is associated with it
     resource_group = get_base_resource_group()
@@ -163,7 +168,7 @@ def set_allowed(name: str, sources: NetworkSecurityGroupConfig) -> Union[None, E
         security_rules.append(
             SecurityRule(
                 name="Allow" + str(priority),
-                protocol=SecurityRuleProtocol.TCP,
+                protocol="*",
                 source_port_range="*",
                 destination_port_range="*",
                 source_address_prefix=src,
@@ -284,7 +289,7 @@ def dissociate_nic(name: str, nic: NetworkInterface) -> Union[None, Error]:
     except (ResourceNotFoundError, CloudError) as err:
         if is_concurrent_request_error(str(err)):
             logging.debug(
-                "associate NSG with NIC had conflicts with ",
+                "dissociate nsg with nic had conflicts with ",
                 "concurrent request, ignoring %s",
                 err,
             )
@@ -292,7 +297,7 @@ def dissociate_nic(name: str, nic: NetworkInterface) -> Union[None, Error]:
         return Error(
             code=ErrorCode.UNABLE_TO_UPDATE,
             errors=[
-                "Unable to associate nsg %s with nic %s due to %s"
+                "Unable to dissociate nsg %s with nic %s due to %s"
                 % (
                     name,
                     nic.name,
@@ -304,6 +309,124 @@ def dissociate_nic(name: str, nic: NetworkInterface) -> Union[None, Error]:
     return None
 
 
+def associate_subnet(
+    name: str, vnet: VirtualNetwork, subnet: Subnet
+) -> Union[None, Error]:
+
+    resource_group = get_base_resource_group()
+    nsg = get_nsg(name)
+    if not nsg:
+        return Error(
+            code=ErrorCode.UNABLE_TO_FIND,
+            errors=["cannot associate subnet. nsg %s not found" % name],
+        )
+
+    if nsg.location != vnet.location:
+        return Error(
+            code=ErrorCode.UNABLE_TO_UPDATE,
+            errors=[
+                "subnet and nsg have to be in the same region.",
+                "nsg %s %s, subnet: %s %s"
+                % (nsg.name, nsg.location, subnet.name, subnet.location),
+            ],
+        )
+
+    #  this is noop, since correct NSG is already assigned
+    if subnet.network_security_group and subnet.network_security_group.id == nsg.id:
+        return None
+
+    logging.info(
+        "associating subnet %s with nsg: %s %s", subnet.name, resource_group, name
+    )
+
+    subnet.network_security_group = nsg
+    network_client = get_network_client()
+    try:
+        network_client.subnets.begin_create_or_update(
+            resource_group, vnet.name, subnet.name, subnet
+        )
+    except (ResourceNotFoundError, CloudError) as err:
+        if is_concurrent_request_error(str(err)):
+            logging.debug(
+                "associate NSG with subnet had conflicts",
+                "with concurrent request, ignoring %s",
+                err,
+            )
+            return None
+        return Error(
+            code=ErrorCode.UNABLE_TO_UPDATE,
+            errors=[
+                "Unable to associate nsg %s with subnet %s due to %s"
+                % (
+                    name,
+                    subnet.name,
+                    err,
+                )
+            ],
+        )
+
+    return None
+
+
+def dissociate_subnet(
+    name: str, vnet: VirtualNetwork, subnet: Subnet
+) -> Union[None, Error]:
+    if subnet.network_security_group is None:
+        return None
+    resource_group = get_base_resource_group()
+    nsg = get_nsg(name)
+    if not nsg:
+        return Error(
+            code=ErrorCode.UNABLE_TO_FIND,
+            errors=["cannot update nsg rules. nsg %s not found" % name],
+        )
+    if nsg.id != subnet.network_security_group.id:
+        return Error(
+            code=ErrorCode.UNABLE_TO_UPDATE,
+            errors=[
+                "subnet is not associated with this nsg.",
+                "nsg %s, subnet: %s, subnet.nsg: %s"
+                % (
+                    nsg.id,
+                    subnet.name,
+                    subnet.network_security_group.id,
+                ),
+            ],
+        )
+
+    logging.info(
+        "dissociating subnet %s with nsg: %s %s", subnet.name, resource_group, name
+    )
+
+    subnet.network_security_group = None
+    network_client = get_network_client()
+    try:
+        network_client.subnets.begin_create_or_update(
+            resource_group, vnet.name, subnet.name, subnet
+        )
+    except (ResourceNotFoundError, CloudError) as err:
+        if is_concurrent_request_error(str(err)):
+            logging.debug(
+                "dissociate nsg with subnet had conflicts with ",
+                "concurrent request, ignoring %s",
+                err,
+            )
+            return None
+        return Error(
+            code=ErrorCode.UNABLE_TO_UPDATE,
+            errors=[
+                "Unable to dissociate nsg %s with subnet %s due to %s"
+                % (
+                    name,
+                    subnet.name,
+                    err,
+                )
+            ],
+        )
+
+    return None
+
+
 class NSG(BaseModel):
     name: str
     region: Region
@@ -345,3 +468,13 @@ class NSG(BaseModel):
 
     def dissociate_nic(self, nic: NetworkInterface) -> Union[None, Error]:
         return dissociate_nic(self.name, nic)
+
+    def associate_subnet(
+        self, vnet: VirtualNetwork, subnet: Subnet
+    ) -> Union[None, Error]:
+        return associate_subnet(self.name, vnet, subnet)
+
+    def dissociate_subnet(
+        self, vnet: VirtualNetwork, subnet: Subnet
+    ) -> Union[None, Error]:
+        return dissociate_subnet(self.name, vnet, subnet)

src/api-service/__app__/onefuzzlib/azure/subnet.py

@@ -8,6 +8,7 @@ import os
 from typing import Any, Optional, Union, cast
 
 from azure.core.exceptions import ResourceNotFoundError
+from azure.mgmt.network.models import Subnet, VirtualNetwork
 from msrestazure.azure_exceptions import CloudError
 from onefuzztypes.enums import ErrorCode
 from onefuzztypes.models import Error, NetworkConfig
@@ -16,21 +17,41 @@ from onefuzztypes.primitives import Region
 from .network_mgmt_client import get_network_client
 
 
-def get_subnet_id(resource_group: str, name: str, subnet_name: str) -> Optional[str]:
+def get_vnet(resource_group: str, name: str) -> Optional[VirtualNetwork]:
     network_client = get_network_client()
     try:
-        subnet = network_client.subnets.get(resource_group, name, subnet_name)
-        return cast(str, subnet.id)
+        vnet = network_client.virtual_networks.get(resource_group, name)
+        return cast(VirtualNetwork, vnet)
     except (CloudError, ResourceNotFoundError):
         logging.info(
-            "subnet missing: resource group:%s name:%s subnet_name:%s",
+            "vnet missing: resource group:%s name:%s",
             resource_group,
             name,
-            subnet_name,
         )
     return None
 
 
+def get_subnet(
+    resource_group: str, vnet_name: str, subnet_name: str
+) -> Optional[Subnet]:
+    # Has to get using vnet. That way NSG field is properly set up in subnet
+    vnet = get_vnet(resource_group, vnet_name)
+    if vnet:
+        for subnet in vnet.subnets:
+            if subnet.name == subnet_name:
+                return subnet
+
+    return None
+
+
+def get_subnet_id(resource_group: str, name: str, subnet_name: str) -> Optional[str]:
+    subnet = get_subnet(resource_group, name, subnet_name)
+    if subnet:
+        return cast(str, subnet.id)
+    else:
+        return None
+
+
 def delete_subnet(resource_group: str, name: str) -> Union[None, CloudError, Any]:
     network_client = get_network_client()
     try:

src/api-service/__app__/onefuzzlib/azure/vm.py

@@ -57,11 +57,15 @@ def create_vm(
 
     nic = get_public_nic(resource_group, name)
     if nic is None:
-        result = create_public_nic(resource_group, name, location)
+        result = create_public_nic(resource_group, name, location, nsg)
         if isinstance(result, Error):
             return result
         logging.info("waiting on nic creation")
         return None
+
+    # when public nic is created, VNET must exist at that point
+    # this is logic of get_public_nic function
+
     if nsg:
         result = nsg.associate_nic(nic)
         if isinstance(result, Error):

src/api-service/__app__/timer_proxy/__init__.py

@@ -7,8 +7,16 @@ import logging
 
 import azure.functions as func
 from onefuzztypes.enums import VmState
+from onefuzztypes.models import Error
 
-from ..onefuzzlib.azure.nsg import delete_nsg, list_nsgs, ok_to_delete
+from ..onefuzzlib.azure.network import Network
+from ..onefuzzlib.azure.nsg import (
+    associate_subnet,
+    delete_nsg,
+    get_nsg,
+    list_nsgs,
+    ok_to_delete,
+)
 from ..onefuzzlib.orm import process_state_updates
 from ..onefuzzlib.proxy import PROXY_LOG_PREFIX, Proxy
 from ..onefuzzlib.workers.scalesets import Scaleset
@@ -52,9 +60,26 @@ def main(mytimer: func.TimerRequest) -> None:  # noqa: F841
         if all(x.outdated for x in proxies if x.region == region):
             Proxy.get_or_create(region)
 
+            logging.info("Creating new proxy in region %s" % region)
+
+        # this is required in order to support upgrade from non-nsg to
+        # nsg enabled OneFuzz this will overwrite existing NSG
+        # assignment though. This behavior is acceptable at this point
+        # since we do not support bring your own NSG
+        if get_nsg(region):
+            network = Network(region)
+            subnet = network.get_subnet()
+            if subnet:
+                result = associate_subnet(region, network.get_vnet(), subnet)
+                if isinstance(result, Error):
+                    logging.error(
+                        "Failed to associate NSG and subnet due to %s in region %s"
+                        % (result, region)
+                    )
+
     # if there are NSGs with name same as the region that they are allocated
     # and have no NIC associated with it then delete the NSG
     for nsg in list_nsgs():
         if ok_to_delete(regions, nsg.location, nsg.name):
-            if nsg.network_interfaces is None:
+            if nsg.network_interfaces is None and nsg.subnets is None:
                 delete_nsg(nsg.name)