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authorJakob Unterwurzacher2017-05-23 20:46:24 +0200
committerJakob Unterwurzacher2017-05-23 21:26:38 +0200
commite827763f2e6226d9f5778d56c28270264950c0f5 (patch)
tree2f5f4adeed482dd473cc4714b97a8903806fdbb3 /Documentation
parent508fd9e1d64131958c86175cb8d848f730e629cf (diff)
nametransform: harden name decryption against invalid input
This fixes a few issues I have found reviewing the code: 1) Limit the amount of data ReadLongName() will read. Previously, you could send gocryptfs into out-of-memory by symlinking gocryptfs.diriv to /dev/zero. 2) Handle the empty input case in unPad16() by returning an error. Previously, it would panic with an out-of-bounds array read. It is unclear to me if this could actually be triggered. 3) Reject empty names after base64-decoding in DecryptName(). An empty name crashes emeCipher.Decrypt(). It is unclear to me if B64.DecodeString() can actually return a non-error empty result, but let's guard against it anyway.
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