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Capture services (view source)

Revision as of 23:34, 22 August 2019

5,608 bytes added ,  23:34, 22 August 2019
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= caps:a =
 
= caps:a =
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This is "nn::capsrv::sf::IAlbumAccessorService".
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{| class="wikitable" border="1"
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|-
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! Cmd || Name
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|-
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| 0 || GetAlbumFileCount
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|-
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| 1 || GetAlbumFileList
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|-
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| 2 || LoadAlbumFile
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|-
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| 3 || DeleteAlbumFile
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|-
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| 4 || StorageCopyAlbumFile
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|-
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| 5 || IsAlbumMounted
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|-
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| 6 || GetAlbumUsage
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|-
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| 7 || GetAlbumFileSize
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|-
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| 8 || LoadAlbumFileThumbnail
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|-
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| 9 || [2.0.0+] LoadAlbumScreenShotImage
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|-
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| 10 || [2.0.0+] LoadAlbumScreenShotThumbnailImage
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|-
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| 11 || [2.0.0+] GetAlbumEntryFromApplicationAlbumEntry
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|-
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| 12 || [3.0.0+]
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|-
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| 13 || [3.0.0+]
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|-
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| 14 || [3.0.0+]
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|-
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| 15 || [4.0.0+]
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|-
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| 16 || [4.0.0+]
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|-
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| 17 || [4.0.0+]
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|-
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| 18 || [6.0.0+]
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|-
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| 100 || [5.0.0+]
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|-
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| 101 || [5.0.0+]
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|-
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| 202 || [1.0.0-2.3.0] SaveEditedScreenShot
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|-
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| 301 || GetLastThumbnail
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|-
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| 302 || [4.0.0+]
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|-
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| 401 || GetAutoSavingStorage
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|-
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| 501 || GetRequiredStorageSpaceSizeToCopyAll
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|-
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| 1001 || [3.0.0+]
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|-
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| 1002 || [3.0.0+]
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|-
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| 1003 || [4.0.0+]
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|-
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| 8001 || ForceAlbumUnmounted
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|-
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| 8002 || ResetAlbumMountStatus
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|-
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| 8011 || RefreshAlbumCache
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|-
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| 8012 || GetAlbumCache
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|-
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| 8013 || [4.0.0+]
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|-
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| 8021 || [2.0.0+] GetAlbumEntryFromApplicationAlbumEntryAruid
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|-
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| 10011 || SetInternalErrorConversionEnabled
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|-
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| 50000 || [6.0.0+]
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|-
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| 60002 || [4.0.0+]
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|}
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Cmd1002: Takes a total of 0x38-bytes of input, two type-0x5 input buffers, and returns 0x20-bytes of output. [4.0.0+] No longer returns output, and now takes the following buffers instead: type-0x16, type-0x46, and type-0x6.
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Cmd60002: Takes a total of 8-bytes of input, a PID, and returns an [[#IAlbumAccessorSession]].
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== IAlbumAccessorSession ==
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This is "nn::capsrv::sf::IAlbumAccessorSession".
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This was added with [4.0.0+].
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{| class="wikitable" border="1"
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|-
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! Cmd || Name
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|-
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| 2001 ||
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|-
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| 2002 ||
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|-
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| 2003 ||
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|-
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| 2004 ||
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|-
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| 2005 ||
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|-
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| 2006 ||
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|-
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| 2007 ||
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|-
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| 2008 ||
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|}
    
= caps:c =
 
= caps:c =
 +
This is "nn::capsrv::sf::IAlbumControlService", previously "nn::capsrv::sf::ICaptureControllerService" with [1.0.0].
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{| class="wikitable" border="1"
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|-
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! Cmd || Name || Notes
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|-
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| [1.0.0] 1 || ||
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|-
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| [1.0.0] 2 || ||
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|-
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| 33 || [7.0.0+] || Takes a total of 0x10-bytes of input, no output.
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|-
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| [1.0.0] 1001 || ||
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|-
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| [1.0.0] 1002 || ||
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|-
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| [1.0.0] 1011 || ||
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|-
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| 2001 || ||
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|-
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| 2002 || ||
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|-
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| 2011 || [2.0.0+] ||
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|-
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| 2012 || [2.0.0+] ||
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|-
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| 2013 || [2.0.0+] ||
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|-
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| 2014 || [2.0.0+] ||
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|-
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| 2101 || [2.0.0+] || Takes an input u8 and u64, returns a 0x18-byte struct.
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|-
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| 2102 || [2.0.0+] ||
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|-
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| [2.0.0-3.0.2] 2201 || ||
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|-
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| 2202 || [4.0.0+] ||
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|-
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| 2301 || [2.0.0+] ||
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|-
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| 2302 || [4.0.0+] ||
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|-
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| 60001 || [4.0.0+] || Takes a total of 8-bytes of input and a PID, returns an [[#IAlbumControlSession]].
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|}
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== IAlbumControlSession ==
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This is "nn::capsrv::sf::IAlbumControlSession".
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This was added with [4.0.0+].
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{| class="wikitable" border="1"
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|-
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! Cmd || Name || Notes
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|-
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| 2001 || ||
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|-
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| 2002 || ||
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|-
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| 2003 || ||
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|-
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| 2004 || ||
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|-
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| 2005 || ||
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|-
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| 2006 || ||
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|-
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| 2007 || ||
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|-
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| 2008 || ||
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|-
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| 2401 || ||
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|-
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| 2402 || ||
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|-
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| 2403 || ||
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|-
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| 2404 || ||
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|-
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| 2405 || ||
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|-
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| 2406 || [7.0.0+] ||
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|-
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| 2411 || ||
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|-
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| 2412 || ||
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|-
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| 2413 || ||
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|-
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| 2414 || ||
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|-
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| 2421 || ||
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|-
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| 2422 || ||
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|-
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| 2424 || ||
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|-
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| 2431 || ||
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|-
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| 2433 || ||
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|-
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| 2434 || ||
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|}
    +
= caps:u =
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This is "nn::capsrv::sf::IAlbumApplicationService".
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This was added with [5.0.0+].
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{| class="wikitable" border="1"
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|-
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! Cmd || Name
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|-
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| 32 || [7.0.0+] [[#SetShimLibraryVersion]]
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|-
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| 102 || GetAlbumFileList0AafeAruidDeprecated
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|-
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| 103 || DeleteAlbumFileByAruid
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|-
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| 104 || GetAlbumFileSizeByAruid
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|-
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| 105 || DeleteAlbumFileByAruidForDebug
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|-
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| 110 || LoadAlbumScreenShotImageByAruid
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|-
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| 120 || LoadAlbumScreenShotThumbnailImageByAruid
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|-
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| 130 || PrecheckToCreateContentsByAruid
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|-
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| 140 || [6.0.0+] GetAlbumFileList1AafeAruidDeprecated
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|-
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| 141 || [6.0.0+] GetAlbumFileList2AafeUidAruidDeprecated
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|-
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| 142 || [7.0.0+] GetAlbumFileList3AaeAruid
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|-
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| 143 || [7.0.0+] GetAlbumFileList4AaeUidAruid
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|-
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| 60002 || OpenAccessorSessionForApplication
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|}
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== SetShimLibraryVersion ==
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Takes a total of 0x10-bytes of input and a PID, no output.
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== IAlbumAccessorApplicationSession ==
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This is "nn::capsrv::sf::IAlbumAccessorApplicationSession".
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 +
This was added with [5.0.0+].
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{| class="wikitable" border="1"
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|-
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! Cmd || Name
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|-
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| 2001 || OpenAlbumMovieReadStream
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|-
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| 2002 || CloseAlbumMovieReadStream
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|-
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| 2003 || GetAlbumMovieReadStreamMovieDataSize
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|-
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| 2004 || ReadMovieDataFromAlbumMovieReadStream
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|-
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| 2005 || GetAlbumMovieReadStreamBrokenReason
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|}
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= AlbumEntry =
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{| class="wikitable" border="1"
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|-
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! Offset || Size || Description
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|-
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| 0x0 || 0x8 || Unknown
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|-
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| 0x8 || 0x8 || titleID
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|-
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| 0x10 || 0x2 || Year
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|-
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| 0x12 || 0x1 || Month
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|-
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| 0x13 || 0x1 || Day
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|-
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| 0x14 || 0x1 || Hour
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|-
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| 0x15 || 0x1 || Minute
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|-
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| 0x16 || 0x1 || Second
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|-
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| 0x17 || 0x1 || Unknown
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|-
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| 0x18 || 0x1 || Unknown
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|-
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| 0x19 || 0x1 || Unknown
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|-
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| 0x1A || 0x6 || Padding?
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|}
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This is "nn::capsrv::AlbumEntry". This is a 0x20-byte struct.
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The data at offset 0x10 size 0x8 corresponds to each field in the Album entry filename, prior to the "-".
    
= Notes =
 
= Notes =
−
   
capsrv is responsible for validating the MACs for screenshots stored on the SD card, if the setting capsrv!enable_album_screenshot_filedata_verification is non-zero.  
 
capsrv is responsible for validating the MACs for screenshots stored on the SD card, if the setting capsrv!enable_album_screenshot_filedata_verification is non-zero.  
    
Screenshots are validated as follows: The JPEG's MAC is extracted from the EXIF maker note, and stored. A timestamp string is generated by calling snprintf(&str, 20, "%04d:%02d:%02d %02d:%02d:%02d", ...); with stored timestamp values. If this doesn't match the timestamp string stored in EXIF, then an error 0xA34CE is returned. Otherwise, the entire JPEG is loaded into memory, and the stored EXIF maker note is cleared to zeroes. Then, an HMAC-SHA256 is computed over the entire JPEG using a hardcoded secret key. if (memcmp(calculated_hmac, stored_hmac, 0x10) == 0), the screenshot is valid, else 0xA3ACE is returned.
 
Screenshots are validated as follows: The JPEG's MAC is extracted from the EXIF maker note, and stored. A timestamp string is generated by calling snprintf(&str, 20, "%04d:%02d:%02d %02d:%02d:%02d", ...); with stored timestamp values. If this doesn't match the timestamp string stored in EXIF, then an error 0xA34CE is returned. Otherwise, the entire JPEG is loaded into memory, and the stored EXIF maker note is cleared to zeroes. Then, an HMAC-SHA256 is computed over the entire JPEG using a hardcoded secret key. if (memcmp(calculated_hmac, stored_hmac, 0x10) == 0), the screenshot is valid, else 0xA3ACE is returned.
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In [[3.0.0]], MAC calculation was changed: now, instead of calculating an HMAC, a plain SHA256 hash is calculated. capsrv basically does screenshot_kek = spl::GenerateAesKek(<hardcoded screenshot_kek_source>); spl::LoadAesKey(screenshot_kek, <hardcoded screenshot_key_source>); MAC = spl::ComputeCmac(hash);
    
== Videos ==
 
== Videos ==
−
[[4.0.0]] includes video playback etc support in Album via mp4. These include a JPEG thumbnail, which is presumably used for video "validation". The EXIF from this JPEG doesn't seem to contain the same HMAC data as the original Album JPEGs. The EXIF is also now much larger, with random-looking data at the end.
+
[[4.0.0]] includes video playback etc support in Album via mp4. These include a JPEG thumbnail, which is used for video "validation". The EXIF is also much larger: the MakerNote is 0x498-bytes, with encrypted data starting at offset +0x8. This encryption uses AES-CTR with hardcoded key/ctr. MAC calculation works the same way as the [[3.0.0]]+ JPEG MAC calculation, except with a different movie_kek_source/movie_key_source.
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Note: the Album process itself uses libstagefright for video playback.
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[[Category:Services]]
Retrieved from "https://switchbrew.org/wiki/Special:MobileDiff/2923...7493"

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