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ssb-subset-rpc's Issues

Protect getSubset from "index creation attacks"

One vulnerability I just discovered with getSubset and JITDB:

A remote peer could send N getSubset requests for the queries:

  • {author, type: 'attack1'}
  • {author, type: 'attack2'}
  • ...
  • {author, type: 'attackN'}

Where N is large enough so that N multiplied by the average JITDB bitvector index file becomes so large that it consumes all disk space available. We have to protect the usage of getSubset so that indexes created are purely in memory, OR the type index is always a prefix one (such that all queries will share it).

cc @arj03

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