// Copyright 2021 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

syntax = "proto3";

package google.cloud.osconfig.v1alpha;

import "google/api/field_behavior.proto";

option csharp_namespace = "Google.Cloud.OsConfig.V1Alpha";
option go_package = "google.golang.org/genproto/googleapis/cloud/osconfig/v1alpha;osconfig";
option java_multiple_files = true;
option java_outer_classname = "OSPolicyProto";
option java_package = "com.google.cloud.osconfig.v1alpha";
option php_namespace = "Google\\Cloud\\OsConfig\\V1alpha";
option ruby_package = "Google::Cloud::OsConfig::V1alpha";

// An OS policy defines the desired state configuration for a VM.
message OSPolicy {
  // The `OSFilter` is used to specify the OS filtering criteria for the
  // resource group.
  message OSFilter {
    // This should match OS short name emitted by the OS inventory agent.
    // An empty value matches any OS.
    string os_short_name = 1;

    // This value should match the version emitted by the OS inventory
    // agent.
    // Prefix matches are supported if asterisk(*) is provided as the
    // last character. For example, to match all versions with a major
    // version of `7`, specify the following value for this field `7.*`
    string os_version = 2;
  }

  // An OS policy resource is used to define the desired state configuration
  // and provides a specific functionality like installing/removing packages,
  // executing a script etc.
  //
  // The system ensures that resources are always in their desired state by
  // taking necessary actions if they have drifted from their desired state.
  message Resource {
    // A remote or local file.
    message File {
      // Specifies a file available via some URI.
      message Remote {
        // Required. URI from which to fetch the object. It should contain both the
        // protocol and path following the format `{protocol}://{location}`.
        string uri = 1 [(google.api.field_behavior) = REQUIRED];

        // SHA256 checksum of the remote file.
        string sha256_checksum = 2;
      }

      // Specifies a file available as a Cloud Storage Object.
      message Gcs {
        // Required. Bucket of the Cloud Storage object.
        string bucket = 1 [(google.api.field_behavior) = REQUIRED];

        // Required. Name of the Cloud Storage object.
        string object = 2 [(google.api.field_behavior) = REQUIRED];

        // Generation number of the Cloud Storage object.
        int64 generation = 3;
      }

      // A specific type of file.
      oneof type {
        // A generic remote file.
        Remote remote = 1;

        // A Cloud Storage object.
        Gcs gcs = 2;

        // A local path within the VM to use.
        string local_path = 3;
      }

      // Defaults to false. When false, files are subject to validations
      // based on the file type:
      //
      // Remote: A checksum must be specified.
      // Cloud Storage: An object generation number must be specified.
      bool allow_insecure = 4;
    }

    // A resource that manages a system package.
    message PackageResource {
      // A deb package file. dpkg packages only support INSTALLED state.
      message Deb {
        // Required. A deb package.
        File source = 1 [(google.api.field_behavior) = REQUIRED];

        // Whether dependencies should also be installed.
        // - install when false: `dpkg -i package`
        // - install when true: `apt-get update && apt-get -y install
        // package.deb`
        bool pull_deps = 2;
      }

      // A package managed by APT.
      // - install: `apt-get update && apt-get -y install [name]`
      // - remove: `apt-get -y remove [name]`
      message APT {
        // Required. Package name.
        string name = 1 [(google.api.field_behavior) = REQUIRED];
      }

      // An RPM package file. RPM packages only support INSTALLED state.
      message RPM {
        // Required. An rpm package.
        File source = 1 [(google.api.field_behavior) = REQUIRED];

        // Whether dependencies should also be installed.
        // - install when false: `rpm --upgrade --replacepkgs package.rpm`
        // - install when true: `yum -y install package.rpm` or
        // `zypper -y install package.rpm`
        bool pull_deps = 2;
      }

      // A package managed by YUM.
      // - install: `yum -y install package`
      // - remove: `yum -y remove package`
      message YUM {
        // Required. Package name.
        string name = 1 [(google.api.field_behavior) = REQUIRED];
      }

      // A package managed by Zypper.
      // - install: `zypper -y install package`
      // - remove: `zypper -y rm package`
      message Zypper {
        // Required. Package name.
        string name = 1 [(google.api.field_behavior) = REQUIRED];
      }

      // A package managed by GooGet.
      // - install: `googet -noconfirm install package`
      // - remove: `googet -noconfirm remove package`
      message GooGet {
        // Required. Package name.
        string name = 1 [(google.api.field_behavior) = REQUIRED];
      }

      // An MSI package. MSI packages only support INSTALLED state.
      message MSI {
        // Required. The MSI package.
        File source = 1 [(google.api.field_behavior) = REQUIRED];

        // Additional properties to use during installation.
        // This should be in the format of Property=Setting.
        // Appended to the defaults of `ACTION=INSTALL
        // REBOOT=ReallySuppress`.
        repeated string properties = 2;
      }

      // The desired state that the OS Config agent maintains on the VM.
      enum DesiredState {
        // Unspecified is invalid.
        DESIRED_STATE_UNSPECIFIED = 0;

        // Ensure that the package is installed.
        INSTALLED = 1;

        // The agent ensures that the package is not installed and
        // uninstalls it if detected.
        REMOVED = 2;
      }

      // Required. The desired state the agent should maintain for this package.
      DesiredState desired_state = 1 [(google.api.field_behavior) = REQUIRED];

      // A system package.
      oneof system_package {
        // A package managed by Apt.
        APT apt = 2;

        // A deb package file.
        Deb deb = 3;

        // A package managed by YUM.
        YUM yum = 4;

        // A package managed by Zypper.
        Zypper zypper = 5;

        // An rpm package file.
        RPM rpm = 6;

        // A package managed by GooGet.
        GooGet googet = 7;

        // An MSI package.
        MSI msi = 8;
      }
    }

    // A resource that manages a package repository.
    message RepositoryResource {
      // Represents a single apt package repository. These will be added to
      // a repo file that will be managed at
      // `/etc/apt/sources.list.d/google_osconfig.list`.
      message AptRepository {
        // Type of archive.
        enum ArchiveType {
          // Unspecified is invalid.
          ARCHIVE_TYPE_UNSPECIFIED = 0;

          // Deb indicates that the archive contains binary files.
          DEB = 1;

          // Deb-src indicates that the archive contains source files.
          DEB_SRC = 2;
        }

        // Required. Type of archive files in this repository.
        ArchiveType archive_type = 1 [(google.api.field_behavior) = REQUIRED];

        // Required. URI for this repository.
        string uri = 2 [(google.api.field_behavior) = REQUIRED];

        // Required. Distribution of this repository.
        string distribution = 3 [(google.api.field_behavior) = REQUIRED];

        // Required. List of components for this repository. Must contain at least one
        // item.
        repeated string components = 4 [(google.api.field_behavior) = REQUIRED];

        // URI of the key file for this repository. The agent maintains a
        // keyring at `/etc/apt/trusted.gpg.d/osconfig_agent_managed.gpg`.
        string gpg_key = 5;
      }

      // Represents a single yum package repository. These are added to a
      // repo file that is managed at
      // `/etc/yum.repos.d/google_osconfig.repo`.
      message YumRepository {
        // Required. A one word, unique name for this repository. This is  the `repo
        // id` in the yum config file and also the `display_name` if
        // `display_name` is omitted. This id is also used as the unique
        // identifier when checking for resource conflicts.
        string id = 1 [(google.api.field_behavior) = REQUIRED];

        // The display name of the repository.
        string display_name = 2;

        // Required. The location of the repository directory.
        string base_url = 3 [(google.api.field_behavior) = REQUIRED];

        // URIs of GPG keys.
        repeated string gpg_keys = 4;
      }

      // Represents a single zypper package repository. These are added to a
      // repo file that is managed at
      // `/etc/zypp/repos.d/google_osconfig.repo`.
      message ZypperRepository {
        // Required. A one word, unique name for this repository. This is the `repo
        // id` in the zypper config file and also the `display_name` if
        // `display_name` is omitted. This id is also used as the unique
        // identifier when checking for GuestPolicy conflicts.
        string id = 1 [(google.api.field_behavior) = REQUIRED];

        // The display name of the repository.
        string display_name = 2;

        // Required. The location of the repository directory.
        string base_url = 3 [(google.api.field_behavior) = REQUIRED];

        // URIs of GPG keys.
        repeated string gpg_keys = 4;
      }

      // Represents a Goo package repository. These are added to a repo file
      // that is managed at
      // `C:/ProgramData/GooGet/repos/google_osconfig.repo`.
      message GooRepository {
        // Required. The name of the repository.
        string name = 1 [(google.api.field_behavior) = REQUIRED];

        // Required. The url of the repository.
        string url = 2 [(google.api.field_behavior) = REQUIRED];
      }

      // A specific type of repository.
      oneof repository {
        // An Apt Repository.
        AptRepository apt = 1;

        // A Yum Repository.
        YumRepository yum = 2;

        // A Zypper Repository.
        ZypperRepository zypper = 3;

        // A Goo Repository.
        GooRepository goo = 4;
      }
    }

    // A resource that allows executing scripts on the VM.
    //
    // The `ExecResource` has 2 stages: `validate` and `enforce` and both stages
    // accept a script as an argument to execute.
    //
    // When the `ExecResource` is applied by the agent, it first executes the
    // script in the `validate` stage. The `validate` stage can signal that the
    // `ExecResource` is already in the desired state by returning an exit code
    // of `100`. If the `ExecResource` is not in the desired state, it should
    // return an exit code of `101`. Any other exit code returned by this stage
    // is considered an error.
    //
    // If the `ExecResource` is not in the desired state based on the exit code
    // from the `validate` stage, the agent proceeds to execute the script from
    // the `enforce` stage. If the `ExecResource` is already in the desired
    // state, the `enforce` stage will not be run.
    // Similar to `validate` stage, the `enforce` stage should return an exit
    // code of `100` to indicate that the resource in now in its desired state.
    // Any other exit code is considered an error.
    //
    // NOTE: An exit code of `100` was chosen over `0` (and `101` vs `1`) to
    // have an explicit indicator of `in desired state`, `not in desired state`
    // and errors. Because, for example, Powershell will always return an exit
    // code of `0` unless an `exit` statement is provided in the script. So, for
    // reasons of consistency and being explicit, exit codes `100` and `101`
    // were chosen.
    message ExecResource {
      // A file or script to execute.
      message Exec {
        // The interpreter to use.
        enum Interpreter {
          // Defaults to NONE.
          INTERPRETER_UNSPECIFIED = 0;

          // If no interpreter is specified the
          // source will be executed directly, which will likely only
          // succeed for executables and scripts with shebang lines.
          // [Wikipedia
          // shebang](https://en.wikipedia.org/wiki/Shebang_(Unix)).
          NONE = 1;

          // Indicates that the script will be run with /bin/sh on Linux and
          // cmd.exe on windows.
          SHELL = 2;

          // Indicates that the script will be run with powershell.
          POWERSHELL = 3;
        }

        // What to execute.
        oneof source {
          // A remote or local file.
          File file = 1;

          // An inline script.
          // The size of the script is limited to 1024 characters.
          string script = 2;
        }

        // Optional arguments to pass to the source during execution.
        repeated string args = 3;

        // Required. The script interpreter to use.
        Interpreter interpreter = 4 [(google.api.field_behavior) = REQUIRED];

        // Only recorded for enforce Exec.
        // Path to an output file (that is created by this Exec) whose
        // content will be recorded in OSPolicyResourceCompliance after a
        // successful run. Absence or failure to read this file will result in
        // this ExecResource being non-compliant. Output file size is limited to
        // 100K bytes.
        string output_file_path = 5;
      }

      // Required. What to run to validate this resource is in the desired state.
      // An exit code of 100 indicates "in desired state", and exit code of 101
      // indicates "not in desired state". Any other exit code indicates a
      // failure running validate.
      Exec validate = 1 [(google.api.field_behavior) = REQUIRED];

      // What to run to bring this resource into the desired state.
      // An exit code of 100 indicates "success", any other exit code indicates
      // a failure running enforce.
      Exec enforce = 2;
    }

    // A resource that manages the state of a file.
    message FileResource {
      // Desired state of the file.
      enum DesiredState {
        // Unspecified is invalid.
        DESIRED_STATE_UNSPECIFIED = 0;

        // Ensure file at path is present.
        PRESENT = 1;

        // Ensure file at path is absent.
        ABSENT = 2;

        // Ensure the contents of the file at path matches. If the file does
        // not exist it will be created.
        CONTENTS_MATCH = 3;
      }

      // The source for the contents of the file.
      oneof source {
        // A remote or local source.
        File file = 1;

        // A a file with this content.
        // The size of the content is limited to 1024 characters.
        string content = 2;
      }

      // Required. The absolute path of the file within the VM.
      string path = 3 [(google.api.field_behavior) = REQUIRED];

      // Required. Desired state of the file.
      DesiredState state = 4 [(google.api.field_behavior) = REQUIRED];

      // Consists of three octal digits which represent, in
      // order, the permissions of the owner, group, and other users for the
      // file (similarly to the numeric mode used in the linux chmod
      // utility). Each digit represents a three bit number with the 4 bit
      // corresponding to the read permissions, the 2 bit corresponds to the
      // write bit, and the one bit corresponds to the execute permission.
      // Default behavior is 755.
      //
      // Below are some examples of permissions and their associated values:
      // read, write, and execute: 7
      // read and execute: 5
      // read and write: 6
      // read only: 4
      string permissions = 5;
    }

    // Required. The id of the resource with the following restrictions:
    //
    // * Must contain only lowercase letters, numbers, and hyphens.
    // * Must start with a letter.
    // * Must be between 1-63 characters.
    // * Must end with a number or a letter.
    // * Must be unique within the OS policy.
    string id = 1 [(google.api.field_behavior) = REQUIRED];

    // Resource type.
    oneof resource_type {
      // Package resource
      PackageResource pkg = 2;

      // Package repository resource
      RepositoryResource repository = 3;

      // Exec resource
      ExecResource exec = 4;

      // File resource
      FileResource file = 5;
    }
  }

  // Resource groups provide a mechanism to group OS policy resources.
  //
  // Resource groups enable OS policy authors to create a single OS policy
  // to be applied to VMs running different operating Systems.
  //
  // When the OS policy is applied to a target VM, the appropriate resource
  // group within the OS policy is selected based on the `OSFilter` specified
  // within the resource group.
  message ResourceGroup {
    // Used to specify the OS filter for a resource group
    OSFilter os_filter = 1;

    // Required. List of resources configured for this resource group.
    // The resources are executed in the exact order specified here.
    repeated Resource resources = 2 [(google.api.field_behavior) = REQUIRED];
  }

  // Policy mode
  enum Mode {
    // Invalid mode
    MODE_UNSPECIFIED = 0;

    // This mode checks if the configuration resources in the policy are in
    // their desired state. No actions are performed if they are not in the
    // desired state. This mode is used for reporting purposes.
    VALIDATION = 1;

    // This mode checks if the configuration resources in the policy are in
    // their desired state, and if not, enforces the desired state.
    ENFORCEMENT = 2;
  }

  // Required. The id of the OS policy with the following restrictions:
  //
  // * Must contain only lowercase letters, numbers, and hyphens.
  // * Must start with a letter.
  // * Must be between 1-63 characters.
  // * Must end with a number or a letter.
  // * Must be unique within the assignment.
  string id = 1 [(google.api.field_behavior) = REQUIRED];

  // Policy description.
  // Length of the description is limited to 1024 characters.
  string description = 2;

  // Required. Policy mode
  Mode mode = 3 [(google.api.field_behavior) = REQUIRED];

  // Required. List of resource groups for the policy.
  // For a particular VM, resource groups are evaluated in the order specified
  // and the first resource group that is applicable is selected and the rest
  // are ignored.
  //
  // If none of the resource groups are applicable for a VM, the VM is
  // considered to be non-compliant w.r.t this policy. This behavior can be
  // toggled by the flag `allow_no_resource_group_match`
  repeated ResourceGroup resource_groups = 4 [(google.api.field_behavior) = REQUIRED];

  // This flag determines the OS policy compliance status when none of the
  // resource groups within the policy are applicable for a VM. Set this value
  // to `true` if the policy needs to be reported as compliant even if the
  // policy has nothing to validate or enforce.
  bool allow_no_resource_group_match = 5;
}