Cached credentials for offline domain join and login without local access to the domain controller

1. A method for performing an offline domain join of a virtual machine, the method comprising:

in response to a request for a virtual machine received from a client computing device,

performing a domain join of the virtual machine with an active directory service on a local network;

capturing a post-domain-join snapshot of the virtual machine and producing a delta that contains one or more changes to the virtual machine that were made during the domain join; and

transmitting the delta to the client computing device to be applied to a copy of the virtual machine executed on the client computing device.

2. The method of claim 1 , further comprising:

receiving a user name and password from the client computing device;

performing a first login to the virtual machine with a domain controller of the local network using the received user name and password, wherein performing the first login to the virtual machine causes a set of encrypted credentials to be stored on the virtual machine.

3. The method of claim 1 , wherein performing the domain join of the virtual machine with the active directory service produces a binary blob that is supplied to the virtual machine.

4. The method of claim 1 , further comprising:

in response to the request for the virtual machine, starting a slave service that acts as a user of the virtual machine on the local network, the slave service configured to:

power on the virtual machine with a local user account;

execute a domain join process of an operating system of the virtual machine and receive a blob file from the active directory service;

apply the blob file on the virtual machine and restart the virtual machine;

perform a login to the virtual machine as a domain user using a username and password received from the client computing device; and

power off the virtual machine.

5. The method of claim 1 , further comprising:

receiving the delta on the client computing device;

applying the delta to the copy of the virtual machine executed on the client computing device, wherein the copy of the virtual machine is based on a virtual disk downloaded by the client computing device;

wherein applying the delta to the copy of the virtual machine enables the virtual machine to access one or more private resources residing on the local network located behind a secure firewall.

6. The method of claim 1 , further comprising:

capturing a pre-domain-join snapshot of the virtual machine prior to the domain join;

capturing the post-domain-join snapshot of the virtual machine after the domain join; and

producing the delta based on the pre-domain-join snapshot and the post-domain-join snapshot.

7. The method of claim 1 , wherein performing the domain join of the virtual machine is performed during a download of a virtual disk by the client computing device.

8. A computing device, comprising:

one or more processors; and

memory storing instructions that when executed by the one or more processors, cause the computing device to:

in response to a request for a virtual machine received from a client computing device,

perform a domain join of the virtual machine with an active directory service on a local network;

capture a post-domain-join snapshot of the virtual machine and produce a delta that contains one or more changes to the virtual machine that were made during the domain join; and

transmit the delta to the client computing device to be applied to a copy of the virtual machine executed on the client computing device.

9. The computing device of claim 8 , the memory further comprising instructions that when executed by the one or more processors, cause the computing device to:

receive a user name and password from the client computing device; and

perform a first login to the virtual machine with a domain controller of the local network using the received user name and password, wherein performing the first login to the virtual machine causes a set of encrypted credentials to be stored on the virtual machine.

10. The computing device of claim 8 , wherein performing the domain join of the virtual machine with the active directory service produces a binary blob that is supplied to the virtual machine.

11. The computing device of claim 8 , the memory further comprising instructions that when executed by the one or more processors, cause the computing device to:

in response to the request for the virtual machine, start a slave service that acts as a user of the virtual machine on the local network, the slave service configured to:

power on the virtual machine with a local user account;

execute a domain join process of an operating system of the virtual machine and receive a blob file from the active directory service;

apply the blob file on the virtual machine and restart the virtual machine;

perform a login to the virtual machine as a domain user using a username and password received from the client computing device; and

power off the virtual machine.

12. The computing device of claim 8 , the memory further comprising instructions that when executed by the one or more processors, cause the computing device to:

capture a pre-domain-join snapshot of the virtual machine prior to the domain join;

capture the post-domain-join snapshot of the virtual machine after the domain join; and

produce the delta based on the pre-domain-join snapshot and the post-domain-join snapshot.

13. The computing device of claim 8 , wherein performing the domain join of the virtual machine is performed during a download of a virtual disk by the client computing device.

14. The computing device of claim 8 , wherein performing the domain join of the virtual machine further comprises:

applying one or more security policies of the local network to the virtual machine.

15. A non-transitory computer readable storage medium comprising one or more sequences of instructions, the instructions when executed by one or more processors causing the one or more processors to execute the operations of:

in response to a request for a virtual machine received from a client computing device,

performing a domain join of the virtual machine with an active directory service on a local network;

capturing a post-domain-join snapshot of the virtual machine and producing a delta that contains one or more changes to the virtual machine that were made during the domain join; and

transmitting the delta to the client computing device to be applied to a copy of the virtual machine executed on the client computing device.

16. The non-transitory computer readable storage medium of claim 15 , further comprising instructions executed by one or more processors causing the one or more processors to execute the operations of:

receiving a user name and password from the client computing device;

performing a first login to the virtual machine with a domain controller of the local network using the received user name and password, wherein performing the first login to the virtual machine causes a set of encrypted credentials to be stored on the virtual machine.

17. The non-transitory computer readable storage medium of claim 15 , wherein performing the domain join of the virtual machine with the active directory service produces a binary blob that is supplied to the virtual machine.

18. The non-transitory computer readable storage medium of claim 15 , further comprising instructions executed by one or more processors causing the one or more processors to execute the operations of:

in response to the request for the virtual machine, starting a slave service that acts as a user of the virtual machine on the local network, the slave service configured to:

power on the virtual machine with a local user account;

execute a domain join process of an operating system of the virtual machine and receive a blob file from the active directory service;

apply the blob file on the virtual machine and restart the virtual machine;

perform a login to the virtual machine as a domain user using a username and password received from the client computing device; and

power off the virtual machine.

19. The non-transitory computer readable storage medium of claim 15 , further comprising instructions executed by one or more processors causing the one or more processors to execute the operations of:

receiving the delta on the client computing device;

applying the delta to the copy of the virtual machine executed on the client computing device, wherein the copy of the virtual machine is based on a virtual disk downloaded by the client computing device;

wherein applying the delta to the copy of the virtual machine enables the virtual machine to access one or more private resources residing on the local network located behind a secure firewall.

20. The non-transitory computer readable storage medium of claim 15 , further comprising instructions executed by one or more processors causing the one or more processors to execute the operations of:

capturing a pre-domain-join snapshot of the virtual machine prior to the domain join;

capturing the post-domain-join snapshot of the virtual machine after the domain join; and

producing the delta based on the pre-domain-join snapshot and the post-domain-join snapshot.