RBAC with Conditions

条件角色管理器

ConditionalRoleManager支持在策略级别自定义条件函数。

例如，当我们需要一个临时角色策略时，我们可以按照以下方法进行：

model.conf

[request_definition]
r = sub, obj, act

[policy_definition]
p = sub, obj, act

[role_definition]
g = _, _, (_, _)

[policy_effect]
e = some(where (p.eft == allow))

[matchers]
m = g(r.sub, p.sub) && r.obj == p.obj && r.act == p.act

g = _, _, (_, _) 使用 (_, _) 来包含传递给条件函数的参数列表，_ 作为参数占位符

policy.csv

p, alice, data1, read
p, data2_admin, data2, write
p, data3_admin, data3, read
p, data4_admin, data4, write
p, data5_admin, data5, read
p, data6_admin, data6, write
p, data7_admin, data7, read
p, data8_admin, data8, write

g, alice, data2_admin, 0000-01-01 00:00:00, 0000-01-02 00:00:00
g, alice, data3_admin, 0000-01-01 00:00:00, 9999-12-30 00:00:00
g, alice, data4_admin, _, _
g, alice, data5_admin, _, 9999-12-30 00:00:00
g, alice, data6_admin, _, 0000-01-02 00:00:00
g, alice, data7_admin, 0000-01-01 00:00:00, _
g, alice, data8_admin, 9999-12-30 00:00:00, _

基本使用

通过 AddNamedLinkConditionFunc 为角色策略(g类型策略) 添加一个条件函数，当执行强制时，将自动获取相应的参数并传递给条件函数进行检查。如果检查通过，那么相应的角色策略(g类型策略)就是有效的，否则就是无效的

e.AddNamedLinkConditionFunc("g", "alice", "data2_admin", util.TimeMatchFunc)
e.AddNamedLinkConditionFunc("g", "alice", "data3_admin", util.TimeMatchFunc)
e.AddNamedLinkConditionFunc("g", "alice", "data4_admin", util.TimeMatchFunc)
e.AddNamedLinkConditionFunc("g", "alice", "data5_admin", util.TimeMatchFunc)
e.AddNamedLinkConditionFunc("g", "alice", "data6_admin", util.TimeMatchFunc)
e.AddNamedLinkConditionFunc("g", "alice", "data7_admin", util.TimeMatchFunc)
e.AddNamedLinkConditionFunc("g", "alice", "data8_admin", util.TimeMatchFunc)


e.enforce("alice", "data1", "read")     // except: true
e.enforce("alice", "data2", "write")    // except: false
e.enforce("alice", "data3", "read")     // except: true
e.enforce("alice", "data4", "write")    // except: true
e.enforce("alice", "data5", "read")     // except: true
e.enforce("alice", "data6", "write")    // except: false
e.enforce("alice", "data7", "read")     // except: true
e.enforce("alice", "data8", "write")    // except: false

自定义条件函数

自定义条件函数需要符合以下函数类型

type LinkConditionFunc = func(args ...string) (bool, error)

例如：

// TimeMatchFunc is the wrapper for TimeMatch.
func TimeMatchFunc(args ...string) (bool, error) {
    if err := validateVariadicStringArgs(2, args...); err != nil {
        return false, fmt.Errorf("%s: %s", "TimeMatch", err)
    }
    return TimeMatch(args[0], args[1])
}

// TimeMatch determines whether the current time is between startTime and endTime.
// You can use "_" to indicate that the parameter is ignored
func TimeMatch(startTime, endTime string) (bool, error) {
    now := time.Now()
    if startTime != "_" {
        if start, err := time.Parse("2006-01-02 15:04:05", startTime); err != nil {
            return false, err
        } else if !now.After(start) {
            return false, nil
        }
    }

    if endTime != "_" {
        if end, err := time.Parse("2006-01-02 15:04:05", endTime); err != nil {
            return false, err
        } else if !now.Before(end) {
            return false, nil
        }
    }

    return true, nil
}

带有域的条件角色管理器

model.conf

[request_definition]
r = sub, dom, obj, act

[policy_definition]
p = sub, dom, obj, act

[role_definition]
g = _, _, _, (_, _)

[policy_effect]
e = some(where (p.eft == allow))

[matchers]
m = g(r.sub, p.sub, r.dom) && r.dom == p.dom && r.obj == p.obj && r.act == p.act

policy.csv

p, alice, data1, read
p, data2_admin, data2, write
p, data3_admin, data3, read
p, data4_admin, data4, write
p, data5_admin, data5, read
p, data6_admin, data6, write
p, data7_admin, data7, read
p, data8_admin, data8, write

g, alice, data2_admin, domain2, 0000-01-01 00:00:00, 0000-01-02 00:00:00
g, alice, data3_admin, domain3, 0000-01-01 00:00:00, 9999-12-30 00:00:00
g, alice, data4_admin, domain4, _, _
g, alice, data5_admin, domain5, _, 9999-12-30 00:00:00
g, alice, data6_admin, domain6, _, 0000-01-02 00:00:00
g, alice, data7_admin, domain7, 0000-01-01 00:00:00, _
g, alice, data8_admin, domain8, 9999-12-30 00:00:00, _

基本使用

通过 AddNamedDomainLinkConditionFunc 为角色策略(g类型策略) 添加一个条件函数，当执行强制时，将自动获取相应的参数并传递给条件函数进行检查。如果检查通过，那么相应的角色策略(g类型策略)就是有效的，否则就是无效的

e.AddNamedDomainLinkConditionFunc("g", "alice", "data2_admin", "domain2", util.TimeMatchFunc)
e.AddNamedDomainLinkConditionFunc("g", "alice", "data3_admin", "domain3", util.TimeMatchFunc)
e.AddNamedDomainLinkConditionFunc("g", "alice", "data4_admin", "domain4", util.TimeMatchFunc)
e.AddNamedDomainLinkConditionFunc("g", "alice", "data5_admin", "domain5", util.TimeMatchFunc)
e.AddNamedDomainLinkConditionFunc("g", "alice", "data6_admin", "domain6", util.TimeMatchFunc)
e.AddNamedDomainLinkConditionFunc("g", "alice", "data7_admin", "domain7", util.TimeMatchFunc)
e.AddNamedDomainLinkConditionFunc("g", "alice", "data8_admin", "domain8", util.TimeMatchFunc)


e.enforce("alice", "domain1", "data1", "read")              // except: true
e.enforce("alice", "domain2", "data2", "write")             // except: false
e.enforce("alice", "domain3", "data3", "read")              // except: true
e.enforce("alice", "domain4", "data4", "write")             // except: true
e.enforce("alice", "domain5", "data5", "read")              // except: true
e.enforce("alice", "domain6", "data6", "write")             // except: false
e.enforce("alice", "domain7", "data7", "read")              // except: true
e.enforce("alice", "domain8", "data8", "write")             // except: false
e.enforce("alice", "domain_not_exist", "data1", "write")    // except: false
e.enforce("alice", "domain_not_exist", "data2", "read")     // except: false
e.enforce("alice", "domain_not_exist", "data3", "write")    // except: false
e.enforce("alice", "domain_not_exist", "data4", "read")     // except: false
e.enforce("alice", "domain_not_exist", "data5", "write")    // except: false
e.enforce("alice", "domain_not_exist", "data6", "read")     // except: false
e.enforce("alice", "domain_not_exist", "data7", "write")    // except: false
e.enforce("alice", "domain_not_exist", "data8", "read")     // except: false