Postgresql 中文操作指南
SECURITY LABEL
安全标签——定义或更改应用于对象的安全标签
SECURITY LABEL — define or change a security label applied to an object
Synopsis
SECURITY LABEL [ FOR provider ] ON
{
TABLE object_name |
COLUMN table_name.column_name |
AGGREGATE aggregate_name ( aggregate_signature ) |
DATABASE object_name |
DOMAIN object_name |
EVENT TRIGGER object_name |
FOREIGN TABLE object_name |
FUNCTION function_name [ ( [ [ argmode ] [ argname ] argtype [, ...] ] ) ] |
LARGE OBJECT large_object_oid |
MATERIALIZED VIEW object_name |
[ PROCEDURAL ] LANGUAGE object_name |
PROCEDURE procedure_name [ ( [ [ argmode ] [ argname ] argtype [, ...] ] ) ] |
PUBLICATION object_name |
ROLE object_name |
ROUTINE routine_name [ ( [ [ argmode ] [ argname ] argtype [, ...] ] ) ] |
SCHEMA object_name |
SEQUENCE object_name |
SUBSCRIPTION object_name |
TABLESPACE object_name |
TYPE object_name |
VIEW object_name
} IS { string_literal | NULL }
where aggregate_signature is:
* |
[ argmode ] [ argname ] argtype [ , ... ] |
[ [ argmode ] [ argname ] argtype [ , ... ] ] ORDER BY [ argmode ] [ argname ] argtype [ , ... ]Description
SECURITY LABEL 将一个安全标签应用于数据库对象。可以将任意数量的安全标签（每个标签提供程序一个）与一个给定的数据库对象关联起来。标签提供程序是可以加载的模块，它们使用函数 register_label_provider 来注册自身。
SECURITY LABEL applies a security label to a database object. An arbitrary number of security labels, one per label provider, can be associated with a given database object. Label providers are loadable modules which register themselves by using the function register_label_provider.
Note
register_label_provider 不是一个 SQL 函数；它只能从加载到后端中的 C 代码中调用。
register_label_provider is not an SQL function; it can only be called from C code loaded into the backend.
标签提供者用于确定给定标签是否有效且能否将该标签分配给指定对象。给定标签的含义同样由标签提供者决定。PostgreSQL 不会对标签提供者的安全标签的解释方式施加任何限制，它仅仅提供存储这些标签的机制。在实践中，这个功能的目的是允许与基于标签的强制访问控制 (MAC) 系统（如 SELinux）集成。此类系统根据对象标签而非传统自由访问控制 (DAC) 概念（如用户和组）来做出所有访问控制决定。
The label provider determines whether a given label is valid and whether it is permissible to assign that label to a given object. The meaning of a given label is likewise at the discretion of the label provider. PostgreSQL places no restrictions on whether or how a label provider must interpret security labels; it merely provides a mechanism for storing them. In practice, this facility is intended to allow integration with label-based mandatory access control (MAC) systems such as SELinux. Such systems make all access control decisions based on object labels, rather than traditional discretionary access control (DAC) concepts such as users and groups.
Parameters
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object_nametable_name.column_nameaggregate_namefunction_nameprocedure_name__routine_name
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The name of the object to be labeled. Names of objects that reside in schemas (tables, functions, etc.) can be schema-qualified.
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provider
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The name of the provider with which this label is to be associated. The named provider must be loaded and must consent to the proposed labeling operation. If exactly one provider is loaded, the provider name may be omitted for brevity.
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argmode
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The mode of a function, procedure, or aggregate argument: IN, OUT, INOUT, or VARIADIC. If omitted, the default is IN. Note that SECURITY LABEL does not actually pay any attention to OUT arguments, since only the input arguments are needed to determine the function’s identity. So it is sufficient to list the IN, INOUT, and VARIADIC arguments.
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argname
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The name of a function, procedure, or aggregate argument. Note that SECURITY LABEL does not actually pay any attention to argument names, since only the argument data types are needed to determine the function’s identity.
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argtype
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The data type of a function, procedure, or aggregate argument.
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large_object_oid
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The OID of the large object.
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PROCEDURAL
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This is a noise word.
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string_literal
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The new setting of the security label, written as a string literal.
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NULL
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Write NULL to drop the security label.
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