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Rafał Wojdyła
9a685898af
Protected files (PF) are a new type of file that can be specified in the manifest (SGX only). They are encrypted on disk and transparently decrypted when accessed by the Graphene payload. Other features: - data is integrity protected (tamper resistance) - file swap protection (a PF can only be accessed when in a specific path) - transparency (Graphene payload sees PFs as regular files, no need to modify the payload) See Linux-SGX/protected-files.h for more specific information. The following new manifest elements are added: sgx.protected_files_key = <16-byte hex value> sgx.protected_files.<name> = file:<host path> sgx.protected_files_key specifies the encryption key and is only a temporary implementation. This key should be provisioned with local/remote attestation in the future. Paths specifying PF entries can be files or directories. If a directory is specified, all files/directories within are registered as protected recursively (and are expected to be encrypted in the PF format). Linux-SGX/tools directory contains the pf_crypt utility that converts files to/from the protected format. This proof-of-concept implementation without focus on performance shows roughly a 20% slowdown compared to normal files (based on the LibOS FS tests).