65 lines
1.2 KiB
Bash
Executable File
65 lines
1.2 KiB
Bash
Executable File
#!/bin/rc
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# validateattachment mboxfile
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rfork en
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upastmp=/mail/tmp
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#
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# exit status matching:
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#
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# *discard* - is really bad, refuse the message
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# *accept* - is really good, leave attachment alone
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# * - rewrite attachment to have .suspect extension
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#
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if(! ~ $#* 1){
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echo usage: validateattachment mboxfile >[1=2]
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exit usage
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}
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echo validating >[1=2]
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fn save {
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d=`{date -n}
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cp body $upastmp/$d.$1
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cp raw $upastmp/$d.$1.raw
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whatis x >$upastmp/$d.$1.file
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}
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fn sigexit {
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rm -f $upastmp/$d.$1^('' .raw .file)
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}
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upas/fs -f $1
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cd /mail/fs/mbox/1
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x=`{file body | sed s/body://}
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x=$"x
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switch($x){
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case *Ascii* *text* *'c program'* *'rc executable'*
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save accept
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exit accept
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case *'zip archive'*
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# >[2=1] because sometimes we get zip files we can't parse
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# but the errors look like
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# unzip: reading data for philw.doc.scr failed: ...
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# so we can still catch these.
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if(unzip -tsf body >[2=1] | grep -si ' |\.(scr|exe|pif|bat|com)$'){
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echo executables inside zip file!
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exit discard
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}
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case jpeg 'PNG image' bmp 'GIF image' *'plan 9 image'*
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save accept
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exit accept
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case *Microsoft* *Office*
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save wrap
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exit wrap
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case *MSDOS*
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# no executables
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echo $x
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exit discard
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}
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save wrap
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exit wrap
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