feat(anta): Added the test case to verify SNMP user

anta/custom_types.py

@@ -208,7 +208,6 @@ def validate_regex(value: str) -> str:
 SnmpErrorCounter = Literal[
     "inVersionErrs", "inBadCommunityNames", "inBadCommunityUses", "inParseErrs", "outTooBigErrs", "outNoSuchNameErrs", "outBadValueErrs", "outGeneralErrs"
 ]
-
 IPv4RouteType = Literal[
     "connected",
     "static",
@@ -238,3 +237,6 @@ def validate_regex(value: str) -> str:
     "Route Cache Route",
     "CBF Leaked Route",
 ]
+SnmpVersion = Literal["v1", "v2c", "v3"]
+HashingAlgorithms = Literal["MD5", "SHA", "SHA-224", "SHA-256", "SHA-384", "SHA-512"]
+EncryptionAlgorithms = Literal["AES-128", "AES-192", "AES-256", "DES"]

anta/input_models/snmp.py

@@ -0,0 +1,35 @@
+# Copyright (c) 2023-2025 Arista Networks, Inc.
+# Use of this source code is governed by the Apache License 2.0
+# that can be found in the LICENSE file.
+"""Module containing input models for SNMP tests."""
+
+from __future__ import annotations
+
+from pydantic import BaseModel, ConfigDict
+
+from anta.custom_types import EncryptionAlgorithms, HashingAlgorithms, SnmpVersion
+
+
+class SnmpUser(BaseModel):
+    """Model for a SNMP User."""
+
+    model_config = ConfigDict(extra="forbid")
+    username: str
+    """SNMP user name."""
+    group_name: str | None = None
+    """SNMP group for the user. Required field in the `VerifySnmpUser` test."""
+    security_model: SnmpVersion | None = None
+    """SNMP protocol version. Required field in the `VerifySnmpUser` test."""
+    authentication_type: HashingAlgorithms | None = None
+    """User authentication settings. Can be provided in the `VerifySnmpUser` test."""
+    encryption: EncryptionAlgorithms | None = None
+    """User privacy settings. Can be provided in the `VerifySnmpUser` test."""
+
+    def __str__(self) -> str:
+        """Return a human-readable string representation of the SnmpUser for reporting.
+
+        Examples
+        --------
+        User: Test Group: Test_Group Version: v2c
+        """
+        return f"User: {self.username} Version: {self.security_model}"

anta/tests/snmp.py

@@ -7,15 +7,21 @@
 # mypy: disable-error-code=attr-defined
 from __future__ import annotations
 
-from typing import TYPE_CHECKING, ClassVar, get_args
+from typing import TYPE_CHECKING, ClassVar, TypeVar, get_args
+
+from pydantic import field_validator
 
 from anta.custom_types import PositiveInteger, SnmpErrorCounter, SnmpPdu
+from anta.input_models.snmp import SnmpUser
 from anta.models import AntaCommand, AntaTest
 from anta.tools import get_value
 
 if TYPE_CHECKING:
     from anta.models import AntaTemplate
 
+# Using a TypeVar for the SnmpUser model since mypy thinks it's a ClassVar and not a valid type when used in field validators
+T = TypeVar("T", bound=SnmpUser)
+
 
 class VerifySnmpStatus(AntaTest):
     """Verifies whether the SNMP agent is enabled in a specified VRF.
@@ -339,3 +345,82 @@ def test(self) -> None:
             self.result.is_success()
         else:
             self.result.is_failure(f"The following SNMP error counters are not found or have non-zero error counters:\n{error_counters_not_ok}")
+
+
+class VerifySnmpUser(AntaTest):
+    """Verifies the SNMP user configurations for specified version(s).
+
+    This test performs the following checks for each specified user:
+
+      1. Verifies that the valid user name and group name.
+      2. Ensures that the SNMP v3 security model, the user authentication and privacy settings aligning with version-specific requirements.
+
+    Expected Results
+    ----------------
+    * Success: If all of the following conditions are met:
+        - All specified users are found in the SNMP configuration with valid user group.
+        - The SNMP v3 security model, the user authentication and privacy settings matches the required settings.
+    * Failure: If any of the following occur:
+        - A specified user is not found in the SNMP configuration.
+        - A user's group is not correct.
+        - For SNMP v3 security model, the user authentication and privacy settings does not matches the required settings.
+
+    Examples
+    --------
+    ```yaml
+    anta.tests.snmp:
+      - VerifySnmpUser:
+          snmp_users:
+            - username: test
+              group_name: test_group
+              security_model: v3
+              authentication_type: MD5
+              encryption: AES-128
+    ```
+    """
+
+    categories: ClassVar[list[str]] = ["snmp"]
+    commands: ClassVar[list[AntaCommand | AntaTemplate]] = [AntaCommand(command="show snmp user", revision=1)]
+
+    class Input(AntaTest.Input):
+        """Input model for the VerifySnmpUser test."""
+
+        snmp_users: list[SnmpUser]
+        """List of SNMP users."""
+
+        @field_validator("snmp_users")
+        @classmethod
+        def validate_snmp_user(cls, snmp_users: list[T]) -> list[T]:
+            """Validate that 'authentication_type' or 'encryption' field is provided in each SNMP user."""
+            for user in snmp_users:
+                if user.security_model == "v3" and not (user.authentication_type or user.encryption):
+                    msg = f"{user}; At least one of 'authentication_type' or 'encryption' must be provided."
+                    raise ValueError(msg)
+            return snmp_users
+
+    @AntaTest.anta_test
+    def test(self) -> None:
+        """Main test function for VerifySnmpUser."""
+        self.result.is_success()
+
+        for user in self.inputs.snmp_users:
+            username = user.username
+            group_name = user.group_name
+            security_model = user.security_model
+            authentication_type = user.authentication_type
+            encryption = user.encryption
+
+            # Verify SNMP user details.
+            if not (user_details := get_value(self.instance_commands[0].json_output, f"usersByVersion.{security_model}.users.{username}")):
+                self.result.is_failure(f"{user} - Not found")
+                continue
+
+            if group_name != (act_group := user_details.get("groupName", "Not Found")):
+                self.result.is_failure(f"{user} - Incorrect user group - Expected: {group_name} Actual: {act_group}")
+
+            if security_model == "v3":
+                if authentication_type and (act_auth_type := user_details.get("v3Params", {}).get("authType", "Not Found")) != authentication_type:
+                    self.result.is_failure(f"{user} - Incorrect authentication type - Expected: {authentication_type} Actual: {act_auth_type}")
+
+                if encryption and (act_encryption := user_details.get("v3Params", {}).get("privType", "Not Found")) != encryption:
+                    self.result.is_failure(f"{user} - Incorrect privacy type - Expected: {encryption} Actual: {act_encryption}")

docs/api/tests.snmp.md

@@ -7,7 +7,10 @@ anta_title: ANTA catalog for SNMP tests
   ~ that can be found in the LICENSE file.
   -->
 
+# Tests
+
 ::: anta.tests.snmp
+
     options:
       show_root_heading: false
       show_root_toc_entry: false
@@ -18,3 +21,16 @@ anta_title: ANTA catalog for SNMP tests
       filters:
         - "!test"
         - "!render"
+
+# Input models
+
+::: anta.input_models.snmp
+
+    options:
+      show_root_heading: false
+      show_root_toc_entry: false
+      show_bases: false
+      merge_init_into_class: false
+      anta_hide_test_module_description: true
+      show_labels: true
+      filters: ["!^__str__"]

examples/tests.yaml

@@ -743,6 +743,14 @@ anta.tests.snmp:
   - VerifySnmpStatus:
       # Verifies if the SNMP agent is enabled.
       vrf: default
+  - VerifySnmpUser:
+      # Verifies the SNMP user configurations for specified version(s).
+      snmp_users:
+        - username: test
+          group_name: test_group
+          security_model: v3
+          authentication_type: MD5
+          encryption: AES-128
 anta.tests.software:
   - VerifyEOSExtensions:
       # Verifies that all EOS extensions installed on the device are enabled for boot persistence.

tests/units/anta_tests/test_snmp.py

@@ -15,6 +15,7 @@
     VerifySnmpLocation,
     VerifySnmpPDUCounters,
     VerifySnmpStatus,
+    VerifySnmpUser,
 )
 from tests.units.anta_tests import test
 
@@ -319,4 +320,168 @@
             ],
         },
     },
+    {
+        "name": "success",
+        "test": VerifySnmpUser,
+        "eos_data": [
+            {
+                "usersByVersion": {
+                    "v1": {
+                        "users": {
+                            "Test1": {
+                                "groupName": "TestGroup1",
+                            },
+                        }
+                    },
+                    "v2c": {
+                        "users": {
+                            "Test2": {
+                                "groupName": "TestGroup2",
+                            },
+                        }
+                    },
+                    "v3": {
+                        "users": {
+                            "Test3": {
+                                "groupName": "TestGroup3",
+                                "v3Params": {"authType": "SHA-384", "privType": "AES-128"},
+                            },
+                            "Test4": {"groupName": "TestGroup3", "v3Params": {"authType": "SHA-512", "privType": "AES-192"}},
+                        }
+                    },
+                }
+            }
+        ],
+        "inputs": {
+            "snmp_users": [
+                {"username": "Test1", "group_name": "TestGroup1", "security_model": "v1"},
+                {"username": "Test2", "group_name": "TestGroup2", "security_model": "v2c"},
+                {"username": "Test3", "group_name": "TestGroup3", "security_model": "v3", "authentication_type": "SHA-384", "encryption": "AES-128"},
+                {"username": "Test4", "group_name": "TestGroup3", "security_model": "v3", "authentication_type": "SHA-512", "encryption": "AES-192"},
+            ]
+        },
+        "expected": {"result": "success"},
+    },
+    {
+        "name": "failure-not-configured",
+        "test": VerifySnmpUser,
+        "eos_data": [
+            {
+                "usersByVersion": {
+                    "v3": {
+                        "users": {
+                            "Test3": {
+                                "groupName": "TestGroup3",
+                                "v3Params": {"authType": "SHA-384", "privType": "AES-128"},
+                            },
+                        }
+                    },
+                }
+            }
+        ],
+        "inputs": {
+            "snmp_users": [
+                {"username": "Test1", "group_name": "TestGroup1", "security_model": "v1"},
+                {"username": "Test2", "group_name": "TestGroup2", "security_model": "v2c"},
+                {"username": "Test3", "group_name": "TestGroup3", "security_model": "v3", "authentication_type": "SHA-384", "encryption": "AES-128"},
+                {"username": "Test4", "group_name": "TestGroup3", "security_model": "v3", "authentication_type": "SHA-512", "encryption": "AES-192"},
+            ]
+        },
+        "expected": {
+            "result": "failure",
+            "messages": [
+                "User: Test1 Version: v1 - Not found",
+                "User: Test2 Version: v2c - Not found",
+                "User: Test4 Version: v3 - Not found",
+            ],
+        },
+    },
+    {
+        "name": "failure-incorrect-group",
+        "test": VerifySnmpUser,
+        "eos_data": [
+            {
+                "usersByVersion": {
+                    "v1": {
+                        "users": {
+                            "Test1": {
+                                "groupName": "TestGroup2",
+                            },
+                        }
+                    },
+                    "v2c": {
+                        "users": {
+                            "Test2": {
+                                "groupName": "TestGroup1",
+                            },
+                        }
+                    },
+                    "v3": {},
+                }
+            }
+        ],
+        "inputs": {
+            "snmp_users": [
+                {"username": "Test1", "group_name": "TestGroup1", "security_model": "v1"},
+                {"username": "Test2", "group_name": "TestGroup2", "security_model": "v2c"},
+            ]
+        },
+        "expected": {
+            "result": "failure",
+            "messages": [
+                "User: Test1 Version: v1 - Incorrect user group - Expected: TestGroup1 Actual: TestGroup2",
+                "User: Test2 Version: v2c - Incorrect user group - Expected: TestGroup2 Actual: TestGroup1",
+            ],
+        },
+    },
+    {
+        "name": "failure-incorrect-auth-encryption",
+        "test": VerifySnmpUser,
+        "eos_data": [
+            {
+                "usersByVersion": {
+                    "v1": {
+                        "users": {
+                            "Test1": {
+                                "groupName": "TestGroup1",
+                            },
+                        }
+                    },
+                    "v2c": {
+                        "users": {
+                            "Test2": {
+                                "groupName": "TestGroup2",
+                            },
+                        }
+                    },
+                    "v3": {
+                        "users": {
+                            "Test3": {
+                                "groupName": "TestGroup3",
+                                "v3Params": {"authType": "SHA-512", "privType": "AES-192"},
+                            },
+                            "Test4": {"groupName": "TestGroup4", "v3Params": {"authType": "SHA-384", "privType": "AES-128"}},
+                        }
+                    },
+                }
+            }
+        ],
+        "inputs": {
+            "snmp_users": [
+                {"username": "Test1", "group_name": "TestGroup1", "security_model": "v1"},
+                {"username": "Test2", "group_name": "TestGroup2", "security_model": "v2c"},
+                {"username": "Test3", "group_name": "TestGroup3", "security_model": "v3", "authentication_type": "SHA-384", "encryption": "AES-128"},
+                {"username": "Test4", "group_name": "TestGroup4", "security_model": "v3", "authentication_type": "SHA-512", "encryption": "AES-192"},
+            ]
+        },
+        "expected": {
+            "result": "failure",
+            "messages": [
+                "User: Test3 Version: v3 - Incorrect authentication type - Expected: SHA-384 Actual: SHA-512",
+                "User: Test3 Version: v3 - Incorrect privacy type - Expected: AES-128 Actual: AES-192",
+                "User: Test4 Version: v3 - Incorrect authentication type - Expected: SHA-512 Actual: SHA-384",
+                "User: Test4 Version: v3 - Incorrect privacy type - Expected: AES-192 Actual: AES-128",
+            ],
+        },
+    },
 ]