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|
"======================================================================
|
| Security-related Class Definitions
|
|
======================================================================"
"======================================================================
|
| Copyright 2003
| Free Software Foundation, Inc.
| Written by Paolo Bonzini.
|
| This file is part of the GNU Smalltalk class library.
|
| The GNU Smalltalk class library is free software; you can redistribute it
| and/or modify it under the terms of the GNU Lesser General Public License
| as published by the Free Software Foundation; either version 2.1, or (at
| your option) any later version.
|
| The GNU Smalltalk class library is distributed in the hope that it will be
| useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
| General Public License for more details.
|
| You should have received a copy of the GNU Lesser General Public License
| along with the GNU Smalltalk class library; see the file COPYING.LIB.
| If not, write to the Free Software Foundation, 59 Temple Place - Suite
| 330, Boston, MA 02110-1301, USA.
|
======================================================================"
Object subclass: Permission [
| name actions target positive |
<category: 'Language-Security'>
<comment: 'I am the basic class that represents whether operations that could harm
the system''s security are allowed or denied.'>
Permission class >> name: aSymbol target: aTarget actions: actionsArray [
<category: 'testing'>
^(self new)
name: aSymbol;
target: aTarget;
actions: actionsArray;
yourself
]
Permission class >> name: aSymbol target: aTarget action: action [
<category: 'testing'>
^self
name: aSymbol
target: aTarget
actions: {action}
]
Permission class >> allowing: aSymbol target: aTarget actions: actionsArray [
<category: 'testing'>
^(self
name: aSymbol
target: aTarget
actions: actionsArray) allow
]
Permission class >> allowing: aSymbol target: aTarget action: action [
<category: 'testing'>
^(self
name: aSymbol
target: aTarget
actions: {action}) allow
]
Permission class >> denying: aSymbol target: aTarget actions: actionsArray [
<category: 'testing'>
^(self
name: aSymbol
target: aTarget
actions: actionsArray) deny
]
Permission class >> denying: aSymbol target: aTarget action: action [
<category: 'testing'>
^(self
name: aSymbol
target: aTarget
actions: {action}) deny
]
Permission class >> granting: aSymbol target: aTarget actions: actionsArray [
<category: 'testing'>
^(self
name: aSymbol
target: aTarget
actions: actionsArray) allow
]
Permission class >> granting: aSymbol target: aTarget action: action [
<category: 'testing'>
^(self
name: aSymbol
target: aTarget
actions: {action}) allow
]
check: aPermission for: anObject [
<category: 'testing'>
^(self implies: aPermission)
ifTrue: [self isAllowing]
ifFalse: [anObject isUntrusted not]
]
implies: aPermission [
<category: 'testing'>
aPermission name = name ifFalse: [^false].
(self target notNil and: [aPermission target notNil])
ifTrue:
[(self target isString and: [aPermission target isString])
ifTrue: [(self target match: aPermission target) ifFalse: [^false]]
ifFalse: [self target == aPermission target ifFalse: [^false]]].
(self actions notNil and: [aPermission actions notNil])
ifTrue:
[aPermission actions size = 1
ifTrue: [^self actions includes: (aPermission at: 1)].
^aPermission actions allSatisfy: [:each | self actions includes: each]].
^true
]
action: anObject [
<category: 'accessing'>
self actions: {anObject}
]
actions [
<category: 'accessing'>
^actions
]
actions: anObject [
<category: 'accessing'>
actions isNil
ifFalse: [self error: 'can set permission actions only once'].
(actions allSatisfy: [:each | each isSymbol])
ifFalse: [self error: 'actions must be symbols'].
actions := anObject copy asArray
]
allow [
<category: 'accessing'>
positive isNil ifFalse: [self error: 'can set allow/deny only once'].
positive := true
]
allowing [
<category: 'accessing'>
| savePositive result |
savePositive := positive.
positive := true.
result := self copy.
positive := savePositive.
^result
]
deny [
<category: 'accessing'>
positive isNil ifFalse: [self error: 'can set allow/deny only once'].
positive := false
]
denying [
<category: 'accessing'>
| savePositive result |
savePositive := positive.
positive := false.
result := self copy.
positive := savePositive.
^result
]
isAllowing [
<category: 'accessing'>
^positive
]
name [
<category: 'accessing'>
^name
]
name: anObject [
<category: 'accessing'>
name isNil ifFalse: [self error: 'can set permission name only once'].
anObject isSymbol
ifFalse: [self error: 'permission name must be a symbol'].
name := anObject copy
]
target [
<category: 'accessing'>
^target
]
target: anObject [
<category: 'accessing'>
target isNil ifFalse: [self error: 'can set permission target only once'].
(target allSatisfy: [:each | each isSymbol])
ifFalse: [self error: 'target must be symbols'].
target := anObject copy
]
]
Object subclass: SecurityPolicy [
| dictionary owner |
<category: 'Language-Security'>
<comment: 'I am the class that represents which operations that could harm
the system''s security are allowed or denied to a particular class. If
a class does not have a policy, it is allowed everything if it is trusted,
and denied everything if it is untrusted'>
addPermission: aPermission [
<category: 'modifying'>
owner isNil
ifFalse: [thisContext securityCheckFor: #securityManagement target: owner].
dictionary isNil ifTrue: [dictionary := IdentityDictionary new].
(dictionary at: aPermission name ifAbsentPut: [OrderedCollection new])
add: aPermission allowing
]
removePermission: aPermission [
<category: 'modifying'>
owner isNil
ifFalse: [thisContext securityCheckFor: #securityManagement target: owner].
dictionary isNil ifTrue: [dictionary := IdentityDictionary new].
(dictionary at: aPermission name ifAbsentPut: [OrderedCollection new])
add: aPermission denying
]
withOwner: aClass [
<category: 'modifying'>
^(self copy)
owner: aClass;
yourself
]
owner: aClass [
<category: 'modifying'>
thisContext securityCheckFor: #securityManagement target: aClass.
dictionary := dictionary deepCopy.
owner := aClass.
^self
]
check: aPermission [
<category: 'querying'>
^(dictionary at: aPermission name ifAbsent: [#()])
inject: owner isUntrusted not
into: [:old :perm | (perm implies: aPermission) ifTrue: [perm isAllowing] ifFalse: [old]]
]
implies: aPermission [
<category: 'querying'>
^(dictionary at: aPermission name ifAbsent: [#()]) inject: false
into: [:old :perm | (perm implies: aPermission) ifTrue: [perm isAllowing] ifFalse: [old]]
]
]
|
