doc: create CLI spec for managing trust policies (phase 1)

specs/commandline/policy.md

@@ -0,0 +1,164 @@
+# notation policy
+
+## Description
+
+As part of signature verification workflow, users need to configure the trust policies to specify trusted identities that signed the artifacts, and the level of signature verification to use. For more details, see [trust policy specification and examples](https://github.com/notaryproject/notaryproject/blob/v1.0.0-rc.2/specs/trust-store-trust-policy.md#trust-policy).
+
+The `notation policy` command provides a user-friendly way to manage trust policies. It allows users to import/export trust policies from/to a JSON file, and show trust policies. To get started user can use following sample trust policy. In this sample, there are four policies configured for different requirements:
+
+- The Policy named "wabbit-networks-images" is for verifying images signed by Wabbit Networks and stored in two repositories `registry.acme-rockets.io/software/net-monitor` and `registry.acme-rockets.io/software/net-logger`.
+- Policy named "unsigned-image" is for skipping the verification on unsigned images stored in repository `registry.acme-rockets.io/software/unsigned/net-utils`.
+- Policy "allow-expired-images" is for logging instead of failing expired images stored in repository `registry.acme-rockets.io/software/legacy/metrics`.
+- Policy "global-policy-for-all-other-images" is for verifying any other images that signed by the ACME Rockets.
+
+```jsonc
+{
+    "version": "1.0",
+    "trustPolicies": [
+        {
+            "name": "wabbit-networks-images",
+            "registryScopes": [ 
+              "registry.acme-rockets.io/software/net-monitor",
+              "registry.acme-rockets.io/software/net-logger" 
+            ],
+            "signatureVerification": {
+                "level": "strict"
+            },
+            "trustStores": [ 
+              "ca:wabbit-networks",
+            ],
+            "trustedIdentities": [
+                "x509.subject: C=US, ST=WA, L=Seattle, O=wabbit-networks.io, OU=Security Tools"
+            ]
+        },
+        {
+            "name": "unsigned-image",
+            "registryScopes": [ "registry.acme-rockets.io/software/unsigned/net-utils" ],
+            "signatureVerification": {
+              "level" : "skip" 
+            }
+        },
+        {
+            "name": "allow-expired-images",
+            "registryScopes": [ "registry.acme-rockets.io/software/legacy/metrics" ],
+            "signatureVerification": {
+              "level" : "strict",
+              "override" : {
+                "expiry" : "log"
+              }
+            },
+            "trustStores": ["ca:acme-rockets"],
+            "trustedIdentities": ["*"]
+        },
+        {
+            "name": "global-policy-for-all-other-images",
+            "registryScopes": [ "*" ],       
+            "signatureVerification": {                                
+                "level": "strict"
+            },
+            "trustStores": [ 
+              "ca:acme-rockets"
+            ],                  
+            "trustedIdentities": [                                    
+                "x509.subject: C=US, ST=WA, L=Seattle, O=acme-rockets.io, CN=SecureBuilder"
+            ]
+        }
+    ]
+}
+```
+
+## Outline
+
+### notation policy command
+
+```text
+Manage trust policies for signature verification.
+
+Usage:
+  notation policy [command]
+
+Available Commands:
+  import    import trust policies from a JSON file
+  show      show trust policies
+
+Flags:
+  -h, --help   help for policy
+```
+
+### notation policy import
+
+```text
+Import trust policies from a JSON file
+
+Usage:
+  notation policy import [flags] <file_path>
+
+Flags:
+  -d, --debug     debug mode
+      --force     override the existing trust policies, never prompt
+  -h, --help      help for import
+  -v, --verbose   verbose mode
+```
+
+### notation policy show
+
+```text
+Show trust policies
+
+Usage:
+  notation policy show [flags]
+
+Flags:
+  -d, --debug     debug mode
+  -h, --help      help for show
+  -v, --verbose   verbose mode
+```
+
+## Usage
+
+### Import trust policies from a JSON file
+
+An example of importing trust policies from a JSON file:
+
+```shell  
+notation policy import ./my_policy.json
+```
+
+The trust policies in the JSON file should be validated according to [trust policy properties](https://github.com/notaryproject/notaryproject/blob/v1.0.0-rc.2/specs/trust-store-trust-policy.md#trust-policy-properties). A successful message should be printed out if trust policies are imported successfully. Error logs including the reason should be printed out if the importing fails.
+
+Use `--force` flag to override existing policies without prompt.
+
+### Show trust policies
+
+Use the following command to show trust policies:
+
+```shell
+notation policy show
+```
+
+Upon successful execution, the trust policies are printed out. If trust policies are not configured, users should receive an error message, and a tip to import trust policies from a JSON file.
+
+### Export trust policies into a JSON file
+
+Users can redirect the output of command `notation policy show` to a JSON file.
+
+```shell
+notation policy show > ./trust_policy.json
+```
+
+### Update trust policies
+
+The steps to update trust policies:
+
+1. Export trust policies into a JSON file.
+
+   ```shell
+   notation policy show > ./trust_policy.json
+   ```
+
+2. Edit the exported JSON file "trust_policy.json", update trust policies and save the file.
+3. Import trust policies from the file.
+
+   ```shell
+   notation policy import ./trust_policy.json
+   ```

specs/notation-cli.md

@@ -4,19 +4,19 @@ This spec contains reference information on using notation commands. Each comman
 
 ## Notation Commands
 
-| Command                                     | Description                               |
-| ------------------------------------------- | ----------------------------------------- |
-| [certificate](./commandline/certificate.md) | Manage certificates in trust store        |
-| [inspect](./commandline/inspect.md)         | Inspect signatures                        |
-| [key](./commandline/key.md)                 | Manage keys used for signing              |
-| [list](./commandline/list.md)               | List signatures of the signed artifact    |
-| [login](./commandline/login.md)             | Login to registries                       |
-| [logout](./commandline/logout.md)           | Log out from the logged in registries     |
-| [plugin](./commandline/plugin.md)           | Manage plugins                            |
-| [sign](./commandline/sign.md)               | Sign artifacts                            |
-| [verify](./commandline/verify.md)           | Verify artifacts                          |
-| [version](./commandline/version.md)         | Print the version of notation CLI         |
-
+| Command                                     | Description                                                |
+| ------------------------------------------- | ---------------------------------------------------------- |
+| [certificate](./commandline/certificate.md) | Manage certificates in trust store                         |
+| [inspect](./commandline/inspect.md)         | Inspect signatures                                         |
+| [key](./commandline/key.md)                 | Manage keys used for signing                               |
+| [list](./commandline/list.md)               | List signatures of the signed artifact                     |
+| [login](./commandline/login.md)             | Login to registries                                        |
+| [logout](./commandline/logout.md)           | Log out from the logged in registries                      |
+| [plugin](./commandline/plugin.md)           | Manage plugins                                             |
+| [policy](./commandline/policy.md)           | [Preview] Manage trust policies for signature verification |
+| [sign](./commandline/sign.md)               | Sign artifacts                                             |
+| [verify](./commandline/verify.md)           | Verify artifacts                                           |
+| [version](./commandline/version.md)         | Print the version of notation CLI                          |
 
 ## Notation Outline
 
@@ -34,6 +34,7 @@ Available Commands:
   login       Login to registry
   logout      Log out from the logged in registries
   plugin      Manage plugins
+  policy      [Preview] Manage trust policies for signature verification
   sign        Sign artifacts
   verify      Verify artifacts
   version     Show the notation version information