Event-based data path detection

1. A computer-implemented method, comprising:

receiving data, in a data processing system, and involving a first node and a second node in a network, the data indicating at least a permission of the second node to access data managed by the first node;

updating, based at least in part on the permission, a first proximity measure between the first node and the second node to result in an updated first proximity measure;

determining, based at least in part on the updated first proximity measure and a second proximity measure between the second node and a third node, whether a data path exists between a data source and a data sink, wherein the third node is different from the first node and the second node; and

indicating whether the data path exists between the data source and the data sink.

2. The computer-implemented method of claim 1 , wherein the first node is the data source and the third node is the data sink.

3. The computer-implemented method of claim 1 , wherein the first node is the data sink and the third node is the data source.

4. The computer-implemented method of claim 1 , wherein the first node and second node are both different from the data source and data sink.

5. The computer-implemented method of claim 1 , wherein the data comprises network log entries.

6. The computer-implemented method of claim 1 , wherein the data comprises a record that indicates the permission, wherein the first node manages a database and the permission indicates that the second node may access the database managed by the first node.

7. The computer-implemented method of claim 1 , wherein the first node and the second node are services in the network.

8. A system comprising:

at least one computing device that implements one or more services, wherein the one or more services:

for a node pair including a first node and a second node in a network, receive data indicating at least a permission of the first node to access data managed by the second node;

update a first proximity measure associated with first node based at least in part on the data to result in an updated first proximity measure;

and

detect a path between a data source and a data sink based at least in part on the updated first proximity measure and a second proximity measure associated with at least the second node and a third node, wherein the third node is different from the first node and the second node.

9. The system of claim 8 , wherein updating the first proximity measure comprises adding an edge to a graph representing nodes in the network.

10. The system of claim 8 , wherein the data includes a record that indicates the permission of the first node to access data via the second node.

11. The system of claim 8 , wherein the data comprises a log entry.

12. The system of claim 8 , wherein the updating the first proximity measure comprises changing the first proximity measure from indicating no path between the first node and second node to indicating a path portion between the first node and second node.

13. The system of claim 8 , wherein detecting the path between the first node and the second node comprises connecting a first path comprising the first node and a second path comprising the second node.

14. The system of claim 8 , wherein:

the data further indicates an attribute specifying that data may pass from the first node to the second node; and

the proximity measure of the first node is updated based at least in part on the attribute.

15. A non-transitory computer-readable storage medium comprising executable instructions that, if executed by one or more processors of a computer system, cause the computer system to at least:

update a first proximity measure associated with a first node and a second node in a network, based at least in part on information indicating at least a privilege of the second node to access data managed by the first node, to result in an updated first proximity measure, the updated first proximity measure being weighted according to a type of activity indicated by the information;

determine, based at least in part on the updated first proximity measure and a second proximity measure associated with at least the second node and a third node, whether a data path exists between a data source and a data sink, wherein the third node is different from the first node and the second node; and

indicate whether the data path exists between the data source and the data sink.

16. The non-transitory computer-readable storage medium of claim 15 , wherein the first proximity measure is based at least in part on a network distance.

17. The non-transitory computer-readable storage medium of claim 15 , wherein the first node and second node are both different from the data source and the data sink.

18. The non-transitory computer-readable storage medium of claim 15 , wherein the information regarding the first node and the second node is from a log of events involving the network.

19. The non-transitory computer-readable storage medium of claim 15 , wherein the information is based at least in part on a set of privileges of the first node or second node.

20. The non-transitory computer-readable storage medium of claim 15 , wherein the measure indicates an ability of data to pass between the first node and the second node.

21. The computer-implemented method of claim 1 , wherein:

the method further comprises determining, based at least in part on a sum of the first proximity measure and the second proximity measure, a security risk associated with the first node, the second node, and the third node; and

indicating whether the data path exists includes indicating the security risk.

22. The computer-implemented method of claim 21 , wherein the security risk has an inverse relationship to the sum.