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wdormann's profile
Will Dormann
Will Dormann
Will Dormann
@wdormann

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Will Dormann

@wdormann

Vulnerability Analyst at the CERT/CC. My thoughts are my own, not my employer's.

Joined August 2012

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    1. foone‏ @Foone Jan 23
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      But every long file name has to have a corresponding short name, or otherwise those old programs couldn't open them. These names look like this: Long name: Hello, World.txt Short name: HELLOW~1.txt

      1 reply 0 retweets 37 likes
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    2. foone‏ @Foone Jan 23
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      Old programs will only see the short name and use that, newer programs will substitute in the long file name. The short name is the only one that actually species a file, though, and the long name entries just sort of annotate what the file is REALLY called.

      1 reply 0 retweets 31 likes
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    3. foone‏ @Foone Jan 23
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      this is why you can go into DOS and delete HELLOW~1.TXT and it'll disappear from Windows 95, because Windows 95 will just ignore the long-name-entries that have no corresponding short name.

      3 replies 0 retweets 35 likes
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    4. foone‏ @Foone Jan 23
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      But the thing is, this shortening is mainly focused on the file's name, not extension. So what happens if you go onto windows 95 and name a file "HELLO.VERY LONG EXTENSION"? You get something like "HELLO~1.VER"

      1 reply 0 retweets 32 likes
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    5. foone‏ @Foone Jan 23
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      Because while it puts the ~1 stuff in to indicate a truncated file name, for the extension it just truncates it at 3 letters. The full name will still be there in the LFN entries, so Win95 will still show it fine.

      1 reply 0 retweets 29 likes
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    6. foone‏ @Foone Jan 23
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      but it means if you go into DOS and do "DIR *.VER" it'll show you this HELLO~1.VER file. And I suspect they used this fact as a way to make the filtering slightly faster and simpler: It filters on the short name extensions, not the long name extensions.

      2 replies 0 retweets 34 likes
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    7. foone‏ @Foone Jan 23
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      This makes sense because DOS filenames are ALWAYS 8.3 A file named "FOO.TXT" is actually named "FOO_____TXT", where _ means a space character. You always know where the extension is, and it doesn't store the dot because it's implicit.

      2 replies 0 retweets 44 likes
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    8. foone‏ @Foone Jan 23
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      So it's super-simple to match files based on their 8.3 names. Go into the directory records, skip over the first 8 characters of the name, do a match on the last 3. Done.

      1 reply 0 retweets 33 likes
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    9. foone‏ @Foone Jan 23
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      Keep in mind that when this scheme was invented, it was running on very slow computers with very slow hard drives and very little RAM. I literally have a computer the size of a lego brick sitting on my bag with 10x the minimum CPU and 2x the RAM.

      1 reply 0 retweets 41 likes
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    10. foone‏ @Foone Jan 23
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      So cutting corners like this was fine. For the NT series, I don't believe they ever did this, but I'm not 100% sure on that. In any case, when the 9x line of Windows and the NT line merged (in Windows XP), we finally got FULL EXTENSION MATCHING! ... kinda.

      2 replies 0 retweets 34 likes
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      Will Dormann‏ @wdormann Jan 23
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      Replying to @Foone

      I can confirm that even in 2015, file extension matching involved some sorts of unexpected behaviors.pic.twitter.com/T76RCIA0a2

      12:15 PM - 23 Jan 2020
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