Re: [exim] Strange problem with mime_acl_check.

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Author: kuncho pencho
Date:  
To: exim-users
Subject: Re: [exim] Strange problem with mime_acl_check.



Hi Andrew,

I understand your point but this is our
client tried to send mail to us, who is in excluded senders. The
attachment is about 2mb, zipped file, contains folder with 20-30files
inside.

Thanks.






>-------- Оригинално писмо --------


>От: Andrew C Aitchison andrew@???


>Относно: Re: [exim] Strange problem with mime_acl_check.


>До: kuncho pencho


>Изпратено на: 15.01.2016 15:50




On Fri, 15 Jan 2016, kuncho pencho wrote:



> Yes, i see but it was working til yestarday. I check this with my personal mail account and send zipped folder with files inside and pass without problem. Why is not working for my client and where should i looking for this problem?




If you zipped a large file (perhaps 1TB file of zero bytes)

the zipped file might still be quite small.

Since the original file is large, checking it could take a long time ...



Attachments like this are sometimes sent to attack a server,

or possibly to break in, if something crashes in the right way.



> >-------- Оригинално писмо --------


>


> >От: Jeremy Harris

jgh@???

>


> >Относно: Re: [exim] Strange problem with mime_acl_check.


>


> >До:

exim-users@???

>


> >Изпратено на: 15.01.2016 11:51


>


>


> On 15/01/16 09:16, pencho kuncho wrote:


>


>>

user@??? >: host mail.example.com[1.2.3.4] said: 451

>


>> Temporary local problem - please try later (in reply to end of DATA command)


>


>> Log message is:


>


>> 2016-01-14 23:54:22 1aJppa-0000iB-39 H=(mail.host.com) [8.1.4.2] F=

user@??? > temporarily rejected during MIME ACL checks: failed to expand ACL string "${if match{${run{/usr/bin/unzip -l $mime_decoded_filename}}}{\N(?i)\n.+\.(zip|exe|com|vbs|bat|pif|scr|hta|htm|html|js|cmd|chm|cpl|jsp|reg|vbe|lnk|uri|dll|sys|btm|dat|msi|prf|inf|vb|7z|gz|rar|jar|ace|url|cab)\n\N}}": command timed out

>


> [...]


>


>> 21. condition = ${if match{${run{/usr/bin/unzip -l \


>


>


>


> ... it was running a command, unzip. And it gave up after a while,


>


> because the command did not complete.


>


> --


>


> Cheers,


>


> Jeremy


>


>


>


>


>


>


>


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