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Re: squid does not send cached object to an icap-server

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Hi Yuri.

http://i.imgur.com/mW7gNwD.png

http://squidclamav.darold.net/config.html

This is for squidclamav (I use it and have no problems with malware).

I just installed squidclamav - but the behaviour is always the same. An object which has been stored in squid-cache will not be detected by an icap server because squid does not scan the body again:

squidclamav.c(283) squidclamav_init_request_data: DEBUG initializing request data handler.
pool hits:5 allocations: 1
Allocating from objects pool object 0
Requested service: squidclamav
squidclamav.c(337) squidclamav_check_preview_handler: DEBUG processing preview header. squidclamav.c(358) squidclamav_check_preview_handler: DEBUG X-Client-IP: 192.168.216.54
squidclamav.c(1319) extract_http_info: DEBUG method GET
squidclamav.c(1330) extract_http_info: DEBUG url http://www.intern/eicar_com.zip squidclamav.c(389) squidclamav_check_preview_handler: DEBUG URL requested: http://www.intern/eicar_com.zip squidclamav.c(430) squidclamav_check_preview_handler: DEBUG Content-Length: 0 squidclamav.c(449) squidclamav_check_preview_handler: DEBUG No body data, allow 204 squidclamav.c(304) squidclamav_release_request_data: DEBUG Releasing request data.
Storing to objects pool object 0
Log request to access log file /var/log/c-icap/access.log
Width: 0, Parameter:

Any idea, how I can solve that problem. It seems that the only way to be secure is to disable caching in squid. But I hope, this can't be the solution.

Regards,
Stefan

05.05.15 17:45, Stefan Kügler пишет:
Hi Yuri.

Am 05.05.2015 um 12:51 schrieb Yuri Voinov:
This is not squid issue but your AV engine library or ICAP intermediate
AV library configuration.

Thank you for your answer.

Can you explain me a litte bit more detailed why this is not a squid
issue?

In the icap-logfile, I can see a REQMOD-request _AND_ a
RESPMOD-request to the icap-server if the object is not in cache.

But - if the object is in cache - I can only see a REQMOD-request to
the icap-server. I am missing RESPMOD.

It seems to me, that it is a decision of the client (squid) which
request (REQMOD or RESPMOD) will be send to the icap-server (AV-scanner)
- and not a decision of the av-library.

Regards, Stefan


05.05.15 16:43, Stefan Kügler пишет:
Hello.


I have a short question using squid as an ICAP-client.


It seems that squid doesn't send an already downloaded (and cached)
object to an ICAP-server.

Here is a short description what I have done:

1. downloading a word-document with a macro-virus. The Virus-scanner
(ICAP-server) uses an old pattern-file and does not detect the virus.

The object is now in cache.

2. updating the virus-scanner to the newest pattern-file. The
virus-scanner will now detect the macro virus.

3. downloading the same word-document. The object has been delivered
to the client without a new virus scan.



And now some log-entries:

1. First download of the word document:

access.log:
2015-05-05 12:23:52    144 192.168.2.54 TCP_MISS/200 553301 GET
http://www.intern/virus.doc - HIER_DIRECT/193.175.80.229
application/msword

icap.log:
2015-05-05 12:23:52      5 192.168.2.54 ICAP_ECHO/204 135 REQMOD
icap://127.0.0.1:1344/service_scanner - -/127.0.0.1 -
2015-05-05 12:23:52    130 192.168.2.54 ICAP_MOD/200 553897 RESPMOD
icap://127.0.0.1:1344/service_scanner - -/127.0.0.1 -

AV-Scanner:
May  5 12:23:52 sk1 av-icapd[12412]: [7FD24D2B0700] INFO: Starting
ICAP request decoding
May  5 12:23:52 sk1 av-icapd[12412]: [7FD24D2B0700] INFO: Request
message decoded in 1 chunks
May  5 12:23:52 sk1 av-icapd[12412]: [7FD24D2B0700] INFO: Finished
ICAP request decoding
May  5 12:23:52 sk1 av-icapd[12412]: [7FD24D2B0700] INFO: Starting
ICAP request processing
May  5 12:23:52 sk1 av-icapd[12412]: [7FD24D2B0700] INFO: Starting
service processing
May  5 12:23:52 sk1 av-icapd[12412]: [7FD24D2B0700] INFO: REQMOD
processing
May  5 12:23:52 sk1 av-icapd[12412]: [7FD24D2B0700] INFO: Resource at
<GET http://www.intern/virus.doc HTTP/1.1> has no body to be scanned
May  5 12:23:52 sk1 av-icapd[12412]: [7FD24D2B0700] INFO: Finished
service processing
May  5 12:23:52 sk1 av-icapd[12412]: [7FD24D2B0700] INFO: The request
for URI 'http://www.intern/virus.doc' was allowed (Reason: 'Clean'.
Details: '')
May  5 12:23:52 sk1 av-icapd[12412]: [7FD24D2B0700] INFO: Create
response headers type: CLEAN 204
May  5 12:23:52 sk1 av-icapd[12412]: [7FD24D2B0700] INFO: Send headers
May  5 12:23:52 sk1 av-icapd[12412]: [7FD24D2B0700] INFO: Finished
ICAP request processing
May  5 12:23:52 sk1 av-icapd[12412]: [7FD24D2B0700] INFO: Core library
session cleared
May  5 12:23:52 sk1 av-icapd[12412]: [7FD24D1AF700] INFO: Connection
closed by foreign host while waiting for requests
May  5 12:23:52 sk1 av-icapd[12412]: [7FD24D1AF700] INFO: Core library
session cleared
May  5 12:23:52 sk1 av-icapd[12412]: [7FD24CFAD700] INFO: Starting
ICAP request decoding
May  5 12:23:52 sk1 av-icapd[12412]: [7FD24CFAD700] INFO: Request
message decoded in 259 chunks
May  5 12:23:52 sk1 av-icapd[12412]: [7FD24CFAD700] INFO: Finished
ICAP request decoding
May  5 12:23:52 sk1 av-icapd[12412]: [7FD24CFAD700] INFO: Starting
ICAP request processing
May  5 12:23:52 sk1 av-icapd[12412]: [7FD24CFAD700] INFO: Starting
service processing
May  5 12:23:52 sk1 av-icapd[12412]: [7FD24CFAD700] INFO: RESPMOD
processing
May  5 12:23:52 sk1 av-icapd[12412]: [7FD24CFAD700] INFO: Starting
virus scanning for resource at: <GET http://www.intern/virus.doc
HTTP/1.1>
May  5 12:23:52 sk1 av-icapd[12412]: [7FD24CFAD700] INFO: Starting
virus scanning for resource at: <GET http://www.intern/virus.doc
HTTP/1.1>
May  5 12:23:52 sk1 av-icapd[12412]: [7FD24CFAD700] INFO:
[service_scanner]File 'virus.doc' content is stored in
'/var/spool/avira-icap/icap-tmp.6baFv3'
May  5 12:23:52 sk1 av-icapd[12412]: [7FD24CFAD700] INFO: Finished
service processing
May  5 12:23:52 sk1 av-icapd[12412]: [7FD24CFAD700] INFO: The request
for URI 'http://www.intern/virus.doc' was allowed (Reason: 'Clean'.
Details: '')
May  5 12:23:52 sk1 av-icapd[12412]: [7FD24CFAD700] INFO: Create
response headers type: CLEAN
May  5 12:23:52 sk1 av-icapd[12412]: [7FD24CFAD700] INFO: Adding HTTP
headers for response type: CLEAN
May  5 12:23:52 sk1 av-icapd[12412]: [7FD24CFAD700] INFO: Send headers
May  5 12:23:52 sk1 av-icapd[12412]: [7FD24CFAD700] INFO: Send the
original body (552960 bytes)
May  5 12:23:52 sk1 av-icapd[12412]: [7FD24CFAD700] INFO: Finished
ICAP request processing
May  5 12:23:52 sk1 av-icapd[12412]: [7FD24CFAD700] INFO: Core library
session cleared





2. Second download of the word document (after the pattern-update):

access.log:
2015-05-05 12:27:43     35 192.168.2.54 TCP_MEM_HIT/200 553309 GET
http://www.intern/virus.doc - HIER_NONE/- application/msword

icap.log:
2015-05-05 12:27:43      2 192.168.2.54 ICAP_ECHO/204 135 REQMOD
icap://127.0.0.1:1344/service_scanner - -/127.0.0.1 -

AV-Scanner:
May  5 12:27:43 sk1 av-icapd[12412]: [7FD24C4A2700] INFO: Starting
ICAP request decoding
May  5 12:27:43 sk1 av-icapd[12412]: [7FD24C4A2700] INFO: Request
message decoded in 1 chunks
May  5 12:27:43 sk1 av-icapd[12412]: [7FD24C4A2700] INFO: Finished
ICAP request decoding
May  5 12:27:43 sk1 av-icapd[12412]: [7FD24C4A2700] INFO: Starting
ICAP request processing
May  5 12:27:43 sk1 av-icapd[12412]: [7FD24C4A2700] INFO: Starting
service processing
May  5 12:27:43 sk1 av-icapd[12412]: [7FD24C4A2700] INFO: REQMOD
processing
May  5 12:27:43 sk1 av-icapd[12412]: [7FD24C4A2700] INFO: Resource at
<GET http://www.intern/virus.doc HTTP/1.1> has no body to be scanned
May  5 12:27:43 sk1 av-icapd[12412]: [7FD24C4A2700] INFO: Finished
service processing
May  5 12:27:43 sk1 av-icapd[12412]: [7FD24C4A2700] INFO: The request
for URI 'http://www.intern/virus.doc' was allowed (Reason: 'Clean'.
Details: '')
May  5 12:27:43 sk1 av-icapd[12412]: [7FD24C4A2700] INFO: Create
response headers type: CLEAN 204
May  5 12:27:43 sk1 av-icapd[12412]: [7FD24C4A2700] INFO: Send headers
May  5 12:27:43 sk1 av-icapd[12412]: [7FD24C4A2700] INFO: Finished
ICAP request processing
May  5 12:27:43 sk1 av-icapd[12412]: [7FD24C4A2700] INFO: Core library
session cleared


And now my question: Is this a bug in squid - or is it possible to
tell squid to send already cached object to the icap-server?

Kind regards,

Stefan Kuegler
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Viele Grüße - Stefan Kügler
SerNet GmbH
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