CN104967620B - A kind of access control method based on attribute access control strategy - Google Patents
A kind of access control method based on attribute access control strategy Download PDFInfo
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- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/10—Network architectures or network communication protocols for network security for controlling access to devices or network resources
- H04L63/101—Access control lists [ACL]
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Abstract
The invention discloses a kind of access control methods based on attribute access control strategy.The method include the steps that 1) extract user-role's table and role-authority list attribute information in database, user-role-authorization access control relationship Hash table is generated；2) access control policy is generated according to access control relationship Hash table: traversal being iterated to access control relationship Hash table, obtains each key-value pair, i.e., each user and its Authorization Attributes set；Then the access control policy rules of the user are generated according to the Authorization Attributes of user；3) Internet of Things search engine judges according to the access control policy rules the access request, it is determined whether allow to access each access request received.The present invention quickly responds searching request, substantially increases the efficiency of Internet of Things search engine.
Description
Technical field
The invention belongs to network technique fields, and in particular to a kind of access control side based on attribute access control strategy
Method.
Background technique
Background of the invention is in Internet of Things search environment, when user searches for third party's data, in order to protect user
Privacy, Internet of Things search engine is not able to tell that third party's user information, thus third party by database data and its be based on
The access control policy of role submits to Internet of Things search engine, judges user to the access right of resource by Internet of Things search engine
It limits and returning response is to user.Third-party access control is all kinds of, however in Internet of Things common access control be based on
The access control of attribute will if third party can be before submitting to Internet of Things search engine for access control policy and data
The access control policy is converted into beam-based alignment, then the efficiency that Internet of Things search engine will be greatly improved,
It can be avoided the defect that Internet of Things can not identify the access control and can not judge.Therefore we intend proposing a kind of scheme,
To solve the problems, such as that third party's access control based roles are converted into the XACML based on attribute.
In Internet of Things search engine, when data of the user search to third party's mechanism, third party is often by its data
It is sent to Internet of Things search engine with permission, Internet of Things search engine determines to return further according to its data and access control policy
To the resource of user.The most commonly used is beam-based alignments in Internet of Things search engine, it is therefore desirable to will be not based on attribute
Access control be converted into beam-based alignment.In the research of previous database, database data is much concentrated on
Conversion: convert database data to XML or XML and be converted into database data using mapping function by issuing function.
But the conversion for access control in database temporarily can execute the tool of conversion without unification to realize conversion, in the past automatically
Often through manually going to execute conversion, this method is time-consuming and low efficiency, is more likely to when conversion because artificial
Carelessness, it is inconsistent to cause new and old permission.
Summary of the invention
It is an object of the invention to solve the transfer problem of access control policy, a kind of transformation mechanism is provided, in Internet of Things
It,, can automatically will be third-party by input under the premise of not changing former access control based roles in search engine
Role-base access control is converted to XACML, quickly responds to searching request, substantially increases Internet of Things search engine
Efficiency.
The technical solution of the present invention is as follows:
A kind of access control method based on attribute access control strategy, the steps include:
1) user-role's table and role-authority list attribute information in database are extracted, user-role-authorization is generated
Access control relationship Hash table；
2) access control policy is generated according to access control relationship Hash table: access control relationship Hash table is iterated
Traversal, obtains each key-value pair, i.e., each user and its Authorization Attributes set；Then being generated according to the Authorization Attributes of user should
The access control policy rules of user；
3) Internet of Things search engine is for each access request for receiving, according to the access control policy rules to the visit
Ask that request is judged, it is determined whether allow to access.
Further, the method for the access control relationship Hash table is generated are as follows: Hash table has been created first, it will be each
A major key of the user as the Hash table；Then for each user, according to user-, that role relation table obtains the user is corresponding
Role, then according to each Role Parsing role-authority relation table, obtain the corresponding data object of each role and its permission；So
The data object and its permission are added in the Authorization Attributes set of the user afterwards, then by user permission corresponding with its
Attribute set is added in Hash table as a key-value pair, generates the access control relationship Hash table.
Further, if a user has multiple roles, respectively according to each Role Parsing role-authority relation
Table obtains the corresponding data object of each role and its permission.
Further, if other roles of a role succession, which is obtained by role that the role is inherited
Corresponding data object and its permission.
Further, if role's Existence restraint condition, using the constraint condition as the independent attribute of the role
It is stored in corresponding access control policy rules.
Further, the access control policy rules are as follows: subject, role, resource, action, effect,
condition；Wherein, subject is major key, and role is role attribute, and resource is Resource Properties, and action is that operation belongs to
Property, effect is Authorization Attributes, and condition is conditional attribute.
Further, minimum processing, method are carried out to the access control policy rules of generation are as follows: by access control plan
Slightly rule is checked between any two, if there was only an attribute difference in two access control policy rules, this two are visited
It asks that control strategy rule merges, deletes wherein one if all identical.
Further, by access control policy rules between any two according to user -> role -> attribute of resource -> operation four
Sequence is checked, if there was only an attribute difference in two access control policy rules, by this two access control policies
Rule merges, and deletes wherein one if all identical.
Further, the method two access control policy rules merged are as follows: by two access controls to be combined
The corresponding two different attributes value of same attribute item is written in the attribute item in policing rule, the attribute value of other same attribute item
It remains unchanged.
Further, the Internet of Things search engine judges the access request according to access control policy rules,
The method for determining whether access are as follows: the access request is generated an XACML access control and asked by the Internet of Things search engine
It asks；Then the XACML access control is requested to match with the access control policy rules in policy library, if there is
Then allow the access request with result, otherwise refuses the access request.
Compared with prior art, the positive effect of the present invention are as follows:
1, the conversion of previous access control policy generally requires progress manually, and error rate is high.Institute of the present invention
The model of offer automatically can convert XACML access control policy for mutual role help strategy, and it is manually right not need
Strategy is operated.
2, tactful minimum has been carried out to XACML policy after the conversion was complete.It will be in the corresponding multiple roles of a user
Duplicate permission merge and has been deleted, and is also merged to it when acquisition role corresponding accessible resource, most
Smallization XACML access control policy avoids the XACML access control policy rules generated expansion and efficiency is caused to be lower.
3, the present invention after being converted into XACML access control policy rules, each access user still maintain its
Corresponding role and corresponding permission in access control system originally.Access control system in original database simultaneously
It has not been changed.
4, the thinking that the present invention designs can also suitably extend according to actual needs and slightly change.Increase actual needs
Extension or be transformed to the conversions of other access control policies, the present invention substantially increases the efficiency of Internet of Things search engine.
Detailed description of the invention
Fig. 1 is Role-based access control model figure；
Fig. 2 is flow chart of the present invention；
Fig. 3 is program overall model figure；
Fig. 4 is the XACML decision flow diagram based on attribute.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the invention.
This programme is intended realizing that an access control is shifted to new management mechanisms between Internet of Things search engine and third party, by third party
Access control based roles be converted to the Internet of Things commonly XACML access control based on attribute.Internet of Things is searched in this way
The database data that engine can be submitted according to the XACML access control and third party, quickly responds searching request.
Complete Role-based access control model as shown in Figure 1, wherein UA represents the mapping relations of user and role,
PA represents the mapping relations of role and permission, and session S is generated when being user's real time access database data.In general
(such as sql server) can all have two tables in the Database Systems of every kind of access control based roles, and one is to use
Family-role mapping table records the mapping relations between user and role, and one is role-permissions mapping table, records each data
The authority distribution situation (sysmembers the and syspermissions two systems table in such as sql server) of object.We
Our quasi- conversions are user-role-authorization access control relationship in database in case, i.e., corresponding in extraction database
User-role's table and role-authority list attribute, then by the corresponding generation XACML policy rule of these attributes.As shown in Fig. 2,
The program is implemented as follows:
(1) Hash table (algorithm 1) is generated.
An empty Hash table (the 1st line code) is created first, using each user as a major key of Hash table, and is
Each major key creates a corresponding value, which is an empty set (the 3rd line code).Then it is directed to each user,
User-role relation table is parsed, obtains the corresponding role of the user, it is also likely to be multiple which, which may be one,
(the 4th line code).Again according to each Role Parsing role-authority relation table, obtain the corresponding data object of each role with
And its permission, it should be noted that in the corresponding permission of one role of parsing, which may inherit another role, because
This needs to determine this, does not such as inherit other roles, then directly acquire permission (18-28 line code), if as inherited
Other roles continue through corresponding role then to obtain permission (5-17 line code).After the inheritance for determining role,
Also need to determine whether Existence restraint condition (11-13,22-24 line code), if any then using the constraint condition as rule
One individual attribute is stored in the rule (without being then).These attributes are finally added to the Authorization Attributes collection of the user
In conjunction (14-15,25-26 line code), and added using user Authorization Attributes set corresponding with its as a key-value pair
Into Hash table (the 29th line code), the generation of Hash table is completed, the Hash table of generation is as follows.
The attribute in the relation table of parsing based role can be stored with Hash table, it can be fast by the attribute in Hash table
The generation XACML policy rule of speed, and duplicate attribute can be eliminated, recurring rule will not be generated when so that generating XACML
(especially one multiple role of role succession in role succession, the permission that these roles generate repeats, thus generating
A large amount of recurring rules are easy to produce when XACML).
Part Hash table generated be by user-role, role-permissions mapping table obtains, and does not do other
Specially treated, thus the obtained access control data of the Hash table be with user-role, in role-permissions mapping table one by one
It is corresponding.
(2) XACML access control policy (algorithm 2) is generated by Hash table.
As shown in figure 3, this step, is first iterated traversal to the Hash table generated, each key-value pair is obtained, i.e.,
Each user Authorization Attributes set corresponding with it.A user is obtained from each key, then one is extracted from the set of value
Element (the 5th line code), obtaining the corresponding role of the user and attribute, (5-10 line code, attribute include role, resource, behaviour
Make, permission and condition), XACML policy rule then is generated by these attributes, when generating XACML policy rule, needs to infuse
Meaning whether Prescribed Properties, if any then constructing one article of attribute of the role in XACML rule indicates constraint condition (11-
15 line codes).The rule of generation is finally added in XACML access control policy (the 16th line code).For example, passing through major key
First element available userA, role1, res1 in userA and value, 5 attributes such as select, permit and 1 are
Empty conditional attribute, they constructed respectively as an attribute in XACML rule XACML access control policy rules <
UserA, role1, res1, select, permit,> (for easy to read writing, we determine an XACML rule format
Justice is 6 tuples<subject,role,resource,action,effect,condition>, practical policing rule is such as
Shown in lower).
In the step, since each XACML rule is iterated over by Hash table, each of these pair of category is obtained
Property come the XACML rule that generates, therefore its process is determining.Upper its correctness of two steps can also pass through the side of dynamic authentication
Formula is examined: can be converted by identical input, two converters, whether the output result checked is consistent, so
The access control based roles for exporting result and input are compared afterwards, whether comparison is semantic consistent.
(3) (algorithm 3) is minimized to the XACML access control of generation.
XACML policy generated is minimized, tactful scale is reduced, improves the effect of XACML policy in actual use
Rate.(the 3rd line code) is checked according to user -> role -> resource -> operation sequence, if other phases in two rules
Together, an only attribute difference, then can merge (4-8 line code), can delete one if two rules are all identical
(9-11 line code).Such as <user, role, res1, select, permit,>and<user, role, res2, select,
Permit,>on inspection the two resources it is different, other attributes are identical, then can merge, be after merging<user, role,
{ res1, res2 }, select, permit,>；It, can the few XACML access control policy rules number of letter after passing through merging
Mesh improves the recall precision of rule.
(4) the XACML decision based on attribute
By the algorithm and transformation mechanism of front, we smoothly turn access control based roles strategy in database
Beam-based alignment strategy is turned to, in this section, we establish a decision scheme, and with this solution, we can
User is smoothly judged the request of certain resource to and is provided response, concrete scheme is following (as shown in Figure 4):
(1) when Internet of Things search engine receives the request of user, Internet of Things search engine passes through its corresponding mechanism, when
When request needs to be related to access control to a certain third party's resource, then a corresponding request is generated, is sent to based on attribute
XACML access control program execution level；
(2) whether execution level is inquired first needs to update policy library, if needed, executes (4), then again passes through the request
It crosses processing generation XACML access control request and passes to decision-making level；
(3) decision-making level requests XACML access control according to policy library to carry out strategy matching, to execution level if matching
Matching is returned, otherwise returns and mismatches, then carries out corresponding processing according to the result of decision by execution level again, most sweep backward draws
Hold up return final result.
(4) if third party needs to update policy library, third party is converted by converter, generates XACML policy,
It is saved into Policies Resource library, the conversion of strategy is completed, is then returned the result to execution level.
Claims (7)
1. a kind of access control method based on attribute access control strategy, the steps include:
1) user-role's table and role-authority list attribute information in database are extracted, user-role-authorization access is generated
Control planning Hash table；
2) access control policy is generated according to access control relationship Hash table: access control relationship Hash table is iterated time
It goes through, obtains each key-value pair, i.e., each user and its Authorization Attributes set；Then the use is generated according to the Authorization Attributes of user
The access control policy rules at family；
3) Internet of Things search engine asks each access request received according to the access control policy rules to the access
It asks and is judged, it is determined whether allow to access；
Wherein, generate the method for the access control relationship Hash table are as follows: created Hash table first, using each user as
One major key of the Hash table；Then for each user, the corresponding role of the user is obtained according to user-role relation table, then
According to each Role Parsing role-authority relation table, the corresponding data object of each role and its permission are obtained；Then by the number
It is added in the Authorization Attributes set of the user according to object and its permission, then by user Authorization Attributes set corresponding with its
It is added in Hash table as a key-value pair, generates the access control relationship Hash table；
The access control policy rules are as follows: subject, role, resource, action, effect, condition；Its
In, subject is major key, and role is role attribute, and resource is Resource Properties, and action is operational attribute, and effect is
Authorization Attributes, condition are conditional attribute；
Internet of Things search engine is for each access request for receiving according to the access control policy rules to the access request
Judged, it is determined whether the method for allowing to access are as follows:
(1) when the access request is related to the access control to third party's resource, then a corresponding request is generated, is sent to
The execution level of XACML access control program based on attribute；
(2) whether execution level is inquired first needs to update policy library, as needed to then follow the steps (4), then again passes through the request
It crosses processing generation XACML access control request and passes to decision-making level；
(3) decision-making level requests XACML access control according to policy library to carry out strategy matching, returns if matching to execution level
Otherwise matching result is returned and is mismatched, then carry out corresponding processing according to the result of decision by execution level again, most sweep backward draws
Hold up return final result；
(4) if third party needs to update policy library, third party is converted by converter, XACML policy is generated, by it
It is saved in policy library, the conversion of strategy is completed, is then returned the result to execution level.
2. the method as described in claim 1, which is characterized in that if a user has multiple roles, respectively according to every
A Role Parsing role-authority relation table, obtains the corresponding data object of each role and its permission.
3. method according to claim 1 or 2, which is characterized in that if other roles of a role succession, pass through the role
The role inherited obtains the corresponding data object of the role and its permission.
4. method according to claim 1 or 2, which is characterized in that if role's Existence restraint condition, by the constraint item
Part is stored in corresponding access control policy rules as the independent attribute of the role.
5. the method as described in claim 1, which is characterized in that carried out at minimum to the access control policy rules of generation
Reason, method are as follows: check access control policy rules between any two, if there was only one in two access control policy rules
Attribute is different, then merges this two access control policy rules, deletes wherein one if all identical.
6. method as claimed in claim 5, which is characterized in that by access control policy rules between any two according to user -> angle
Color -> attribute sequence of resource -> operation four is checked, if there was only an attribute difference in two access control policy rules,
Then this two access control policy rules are merged, delete wherein one if all identical.
7. method as claimed in claim 5, which is characterized in that the method for merging two access control policy rules
Are as follows: the corresponding two different attributes value of attribute item same in two access control policy rules to be combined is written to the attribute item
In, the attribute value of other same attribute item remains unchanged.
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