Serializable, Guardpublic final class SecurityPermission extends BasicPermission
The target name is the name of a security configuration parameter (see below). Currently the SecurityPermission object is used to guard access to the Policy, Security, Provider, Signer, and Identity objects.
The following table lists all the possible SecurityPermission target names, and for each provides a description of what the permission allows and a discussion of the risks of granting code the permission.
| Permission Target Name | What the Permission Allows | Risks of Allowing this Permission |
|---|---|---|
| createAccessControlContext | Creation of an AccessControlContext | This allows someone to instantiate an AccessControlContext
with a DomainCombiner. Extreme care must be taken when
granting this permission. Malicious code could create a DomainCombiner
that augments the set of permissions granted to code, and even grant the
code AllPermission. |
| getDomainCombiner | Retrieval of an AccessControlContext's DomainCombiner | This allows someone to retrieve an AccessControlContext's
DomainCombiner. Since DomainCombiners may contain
sensitive information, this could potentially lead to a privacy leak. |
| getPolicy | Retrieval of the system-wide security policy (specifically, of the currently-installed Policy object) | This allows someone to query the policy via the
getPermissions call,
which discloses which permissions would be granted to a given CodeSource.
While revealing the policy does not compromise the security of
the system, it does provide malicious code with additional information
which it may use to better aim an attack. It is wise
not to divulge more information than necessary. |
| setPolicy | Setting of the system-wide security policy (specifically, the Policy object) | Granting this permission is extremely dangerous, as malicious code may grant itself all the necessary permissions it needs to successfully mount an attack on the system. |
| createPolicy.{policy type} | Getting an instance of a Policy implementation from a provider | Granting this permission enables code to obtain a Policy object. Malicious code may query the Policy object to determine what permissions have been granted to code other than itself. |
| getProperty.{key} | Retrieval of the security property with the specified key | Depending on the particular key for which access has been granted, the code may have access to the list of security providers, as well as the location of the system-wide and user security policies. while revealing this information does not compromise the security of the system, it does provide malicious code with additional information which it may use to better aim an attack. |
| setProperty.{key} | Setting of the security property with the specified key | This could include setting a security provider or defining the location of the system-wide security policy. Malicious code that has permission to set a new security provider may set a rogue provider that steals confidential information such as cryptographic private keys. In addition, malicious code with permission to set the location of the system-wide security policy may point it to a security policy that grants the attacker all the necessary permissions it requires to successfully mount an attack on the system. |
| insertProvider | Addition of a new provider | This would allow somebody to introduce a possibly malicious provider (e.g., one that discloses the private keys passed to it) as the highest-priority provider. This would be possible because the Security object (which manages the installed providers) currently does not check the integrity or authenticity of a provider before attaching it. The "insertProvider" permission subsumes the "insertProvider.{provider name}" permission (see the section below for more information). |
| removeProvider.{provider name} | Removal of the specified provider | This may change the behavior or disable execution of other parts of the program. If a provider subsequently requested by the program has been removed, execution may fail. Also, if the removed provider is not explicitly requested by the rest of the program, but it would normally be the provider chosen when a cryptography service is requested (due to its previous order in the list of providers), a different provider will be chosen instead, or no suitable provider will be found, thereby resulting in program failure. |
| clearProviderProperties.{provider name} | "Clearing" of a Provider so that it no longer contains the properties used to look up services implemented by the provider | This disables the lookup of services implemented by the provider. This may thus change the behavior or disable execution of other parts of the program that would normally utilize the Provider, as described under the "removeProvider.{provider name}" permission. |
| putProviderProperty.{provider name} | Setting of properties for the specified Provider | The provider properties each specify the name and location of a particular service implemented by the provider. By granting this permission, you let code replace the service specification with another one, thereby specifying a different implementation. |
| removeProviderProperty.{provider name} | Removal of properties from the specified Provider | This disables the lookup of services implemented by the provider. They are no longer accessible due to removal of the properties specifying their names and locations. This may change the behavior or disable execution of other parts of the program that would normally utilize the Provider, as described under the "removeProvider.{provider name}" permission. |
The following permissions have been superseded by newer permissions or are
associated with classes that have been deprecated: Identity,
IdentityScope, Signer. Use of them is discouraged. See the
applicable classes for more information.
| Permission Target Name | What the Permission Allows | Risks of Allowing this Permission |
|---|---|---|
| insertProvider.{provider name} | Addition of a new provider, with the specified name | Use of this permission is discouraged from further use because it is
possible to circumvent the name restrictions by overriding the
Provider.getName() method. Also, there is an equivalent
level of risk associated with granting code permission to insert a provider
with a specific name, or any name it chooses. Users should use the
"insertProvider" permission instead.
This would allow somebody to introduce a possibly malicious provider (e.g., one that discloses the private keys passed to it) as the highest-priority provider. This would be possible because the Security object (which manages the installed providers) currently does not check the integrity or authenticity of a provider before attaching it. |
| setSystemScope | Setting of the system identity scope | This would allow an attacker to configure the system identity scope with certificates that should not be trusted, thereby granting applet or application code signed with those certificates privileges that would have been denied by the system's original identity scope. |
| setIdentityPublicKey | Setting of the public key for an Identity | If the identity is marked as "trusted", this allows an attacker to introduce a different public key (e.g., its own) that is not trusted by the system's identity scope, thereby granting applet or application code signed with that public key privileges that would have been denied otherwise. |
| setIdentityInfo | Setting of a general information string for an Identity | This allows attackers to set the general description for an identity. This may trick applications into using a different identity than intended or may prevent applications from finding a particular identity. |
| addIdentityCertificate | Addition of a certificate for an Identity | This allows attackers to set a certificate for an identity's public key. This is dangerous because it affects the trust relationship across the system. This public key suddenly becomes trusted to a wider audience than it otherwise would be. |
| removeIdentityCertificate | Removal of a certificate for an Identity | This allows attackers to remove a certificate for an identity's public key. This is dangerous because it affects the trust relationship across the system. This public key suddenly becomes considered less trustworthy than it otherwise would be. |
| printIdentity | Viewing the name of a principal and optionally the scope in which it is used, and whether or not it is considered "trusted" in that scope | The scope that is printed out may be a filename, in which case
it may convey local system information. For example, here's a sample
printout of an identity named "carol", who is
marked not trusted in the user's identity database: carol[/home/luehe/identitydb.obj][not trusted] |
| getSignerPrivateKey | Retrieval of a Signer's private key | It is very dangerous to allow access to a private key; private keys are supposed to be kept secret. Otherwise, code can use the private key to sign various files and claim the signature came from the Signer. |
| setSignerKeyPair | Setting of the key pair (public key and private key) for a Signer | This would allow an attacker to replace somebody else's (the "target's") keypair with a possibly weaker keypair (e.g., a keypair of a smaller keysize). This also would allow the attacker to listen in on encrypted communication between the target and its peers. The target's peers might wrap an encryption session key under the target's "new" public key, which would allow the attacker (who possesses the corresponding private key) to unwrap the session key and decipher the communication data encrypted under that session key. |
| 构造器 | 说明 |
|---|---|
SecurityPermission(String name) |
Creates a new SecurityPermission with the specified name.
|
SecurityPermission(String name,
String actions) |
Creates a new SecurityPermission object with the specified name.
|
getActions, impliesclone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitcheckGuard, getName, newPermissionCollectionpublic SecurityPermission(String name)
name - the name of the SecurityPermissionNullPointerException - if name is null.IllegalArgumentException - if name is empty.public SecurityPermission(String name, String actions)
name - the name of the SecurityPermissionactions - should be null.NullPointerException - if name is null.IllegalArgumentException - if name is empty.