红帽全球峰会12.10. 策略（policy）
共享文件系统服务 API 被禁止，并符合基于角色的访问控制策略。这些策略决定了哪些用户可以以某种方式访问某些 API，并在服务的 policy.json 文件中定义。
配置文件 policy.json 可以在任何位置放置。默认预期路径 /var/lib/config-data/puppet-generated/manila/etc/manila/policy.json。
每当对 manila 发出 API 调用时，策略引擎都使用适当的策略定义来确定是否可以接受调用。策略规则决定允许 API 调用的情况。当规则是空字符串： ""; 基于用户角色或规则的规则时，/var/lib/config-data/puppet-generated/manila/etc/manila/policy.json 文件具有始终允许的规则。以下是 manila 的 policy.json 文件片段。应该在 OpenStack 版本之间有所变化。
{
"context_is_admin": "role:admin",
"admin_or_owner": "is_admin:True or project_id:%(project_id)s",
"default": "rule:admin_or_owner",
"share_extension:quotas:show": "",
"share_extension:quotas:update": "rule:admin_api",
"share_extension:quotas:delete": "rule:admin_api",
"share_extension:quota_classes": "",
}
{
"context_is_admin": "role:admin",
"admin_or_owner": "is_admin:True or project_id:%(project_id)s",
"default": "rule:admin_or_owner",
"share_extension:quotas:show": "",
"share_extension:quotas:update": "rule:admin_api",
"share_extension:quotas:delete": "rule:admin_api",
"share_extension:quota_classes": "",
}用户必须分配给您在策略中引用的组和角色。在使用用户管理命令时，该服务会自动完成此操作。
对 /var/lib/config-data/puppet-generated/manila/etc/manila/policy.json 的任何更改都立即有效，这允许在 manila 运行时实施新策略。对策略进行手动修改可能会具有意外的副作用，我们不建议这样做。Manila 不提供默认策略文件；所有默认策略都在代码库中。您可以通过执行： oslopolicy-sample-generator --config-file=var/lib/config-data/puppet-generated/manila/etc/manila/manila-policy-generator.conf，从 manila 代码生成默认策略
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