RBAC with Conditions

条件角色管理器

条件角色管理器（Conditional RoleManager） 允许给角色分配附加条件函数（例如有时限的角色）。只有条件函数返回 true 时，角色分配才有效。

示例：基于时间的角色有效期。模型:

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

角色定义中的 (_, _) 是传给条件函数的额外参数（例如开始和结束时间）。策略：

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, _

基本用法

调用 AddNamedLinkConditionFunc，为每条 g 规则（或相关的用户与角色对）绑定条件函数。判定时，策略中的额外字段会传给这个函数；只有函数返回 true，这条分配才算数。

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

自定义条件函数

函数签名：

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

实现示例：

// 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

带域时，角色定义多一个域字段，括号中是条件参数。模型:

[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, domain1, data1, read
p, data2_admin, domain2, data2, write
p, data3_admin, domain3, data3, read
p, data4_admin, domain4, data4, write
p, data5_admin, domain5, data5, read
p, data6_admin, domain6, data6, write
p, data7_admin, domain7, data7, read
p, data8_admin, domain8, 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, _

基本用法

使用 AddNamedDomainLinkConditionFunc，传入域以及用户、角色、条件参数。条件的求值方式相同，它会收到 g 规则中的额外参数。

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

自定义条件函数使用相同的签名。注意：DomainMatchingFunc（域模式匹配）、MatchingFunc（主体 / 对象模式匹配）和 LinkConditionFunc（角色分配的条件）相互独立，作用于不同阶段。