Policy enforcement of client devices

1. A method comprising:

receiving, from a client device, an access request for an administered resource that is subject to an administrative policy which governs access the administered resource, the access request including a unique identifier of the client device;

comparing the unique identifier with information in a client registry;

in response to determining, based at least in part on the comparing, that the unique identifier matches information from the client registry and a status associated with the unique identifier indicates that the client device is compliant with the administrative policy, determining that the client device is compliant with the administrative policy;

in response to determining, based at least in part on the comparing, that the unique identifier does not matches information from the client registry, determining that the client device is not compliant with the administrative policy;

in response to determining, based at least in part on the comparing, that the unique identifier matches information from the client registry and the status associated with the unique identifier indicates that the client device is not compliant with the administrative policy, determining that the client device is not compliant with the administrative policy;

if the client device is compliant with the administrative policy, sending a token to the client device that provides access to the administered resource; and

if the client device is not compliant with the administrative policy, sending the client device one or more instructions instructing at least one of the client device or a user of the client device how to conform the client device to the administrative policy.

2. The method of claim 1 , wherein the one or more instructions instruct the client device to download a client application from a management server device, and wherein the client application is configured to apply one or more data security policies to the client device.

3. The method of claim 2 , wherein the client application is configured, based on the administrative policy, to apply one or more of the following data security policies to the client device:

causing a password to be required to access the client device;

causing the password to meet one or more format requirements;

forcing a password reset for the client device;

automatically locking the client device in response to the client device operating in idle mode for a period of time; or

preventing the client device from operating in idle mode.

4. The method of claim 2 , further comprising:

sending at least one instruction that causes the client device to remove data at the client device.

5. The method of claim 1 , further comprising, in response to receiving the access request, notifying an administrator of the access request.

6. A method comprising:

receiving, from a client device, a request to access a client application that indicates a unique identifier of the client device, wherein the client application is configured to apply an administrative policy to the client device, wherein the administrative policy governs access by the client device the administered resource;

comparing the unique identifier with information in a client registry;

in response to determining, based at least in part on the comparing, that the unique identifier matches information from the client registry and a status associated with the unique identifier indicates that the client device is compliant with the administrative policy, determining that the client device is compliant with the administrative policy;

in response to determining, based at least in part on the comparing, that the unique identifier does not matches information from the client registry, determining that the client device is not compliant with the administrative policy;

in response to determining, based at least in part on the comparing, that the unique identifier matches information from the client registry and the status associated with the unique identifier indicating that the client device is not compliant with the administrative policy, determining that the client device is not compliant with the administrative policy; and

if the client device is not compliant with the administrative policy:

sending the client application to the client device; and

updating the status associated with the unique identifier and included in the client registry with information that indicates the client device is compliant with the administrative policy.

7. The method of claim 6 , wherein updating the client registry comprises:

responsive to determining that the client registry does not include the unique identifier, adding the unique identifier to the client registry with the associated status that indicates whether the client device is compliant with the administrative policy.

8. The method of claim 6 , further comprising:

sending at least one instruction to the client device that instructs the client device to send a communication to a management server device within a certain time period;

receiving the communication within the certain time period, such that the client device has access to the administered resource;

after not receiving a subsequent communication from the client device within the certain time period, receiving from the client device a third access request to access the administered resource; and

updating the client registry to indicate that access is denied to the administered resource.

9. The method of claim 6 , further comprising:

sending at least one instruction to the client device that instructs the client device to send a communication to a management server device at a certain time;

receiving the communication at the certain time period, such that the client device has access to the administered resource;

after not receiving a subsequent communication from the client device at the certain time, receiving from the client device a third access request to access the administered resource; and

updating the client registry to indicate that access is denied to the administered resource.

10. A device comprising:

one or more processors;

one or more communication ports;

a memory storing instructions that, when executed, cause the one or more processors to:

receive, via the one or more communication ports, an access request for an administered resource that is subject to an administrative policy which governs access the administered resource, the access request including a unique identifier of the client device;

determine, based on a client registry that includes the unique identifier of the client device and a status associated with the unique identifier indicating whether the client device is compliant with the administrative policy, whether the client device is compliant with the administrative policy associated with the administered resource; comparing the unique identifier with information in a client registry;

in response to determining, based at least in part on the comparing, that the unique identifier matches information from the client registry and a status associated with the unique identifier indicates that the client device is compliant with the administrative policy, determine that the client device is compliant with the administrative policy;

in response to determining, based at least in part on the comparing, that the unique identifier does not matches information from the client registry, determine that the client device is not compliant with the administrative policy;

in response to determining, based at least in part on the comparing, that the unique identifier matches information from the client registry and the status associated with the unique identifier indicates that the client device is not compliant with the administrative policy, determine that the client device is not compliant with the administrative policy;

if the client device is compliant with the administrative policy, sending a token to the client device that provides access to the administered resource; and

if the client device is not compliant with the administrative policy, sending the client device one or more instructions instructing at least one of the client device or a user of the client device how to conform the client device to the administrative policy.

11. The device of claim 10 , wherein the one or more instructions instruct the client device to download a client application from a management server device, and wherein the client application is configured to apply one or more data security policies to the client device.

12. The device of claim 11 , wherein the client application is configured, based on the administrative policy, to apply one or more of the following data security policies to the client device:

causing a password to be required to access the client device;

causing the password to meet one or more format requirements;

forcing a password reset for the client device;

automatically locking the client device in response to the client device operating in idle mode for a period of time; or

preventing the client device from operating in idle mode.

13. The device of claim 11 , wherein the instructions further cause the one or more processors to send, via the one or more communication ports, at least one instruction that causes the client device to remove data at the client device.

14. The device of claim 10 , wherein the instructions further cause the one or more processors to, in response to receiving the access request, notify an administrator of the access request.