Squidguard's group based profile creation broke Squid and shared folders permissions

[celiofk (Celio Fukunaga)]

Hi, everybody.

First of all, sorry for my English.
I’m testing NS7b2 in a real machine.
My server act as a gateway, DC and Proxy.
Everything worked fine until I created a profile that bypass the proxy filter for a specific group. After that, Squid service stopped and shared folders turned inaccessible.
Deleting that profile makes Squid to start again, but wrong permissions on shared folders still remains.
I reproduced this behavior twice in a real machine and once in Virtualbox.
Cheers.

[davidep (Davide Principi)]

Squid service stopped and shared folders turned inaccessible

I can’t figure how they can be related…

Please have a look to this Shared folders bug. Is this your case, too?

Users unable to write on Shared Folder

Dear Support, we cannot write on shared folder created. On the log messages I found this error "sssd[be[domain.com]]: Warning: user would have been denied GPO-based logon access if the ad_gpo_access_control option were set to enforcing mode" I can browse the folder but cannot write. Could help me please? Thanks

…about squid: could you attach some log files? Can you reproduce the squid problem? What is the procedure to reproduce the bug?

[celiofk (Celio Fukunaga)]

Hi, davidep.

• install nethserver;
• apply updates;
• reboot
• install kmod-e100 from elrepo;
• configure red lan to use DHCP;
• configure green lan static 10.0.0.1/24;
• configure DHCP to use green lan;
• install DC, file server, web proxy and web content filter;
• configure DC to use 10.0.0.2;
• create users;
• create groups and put users inside them;
• create folders for each group given group write permissions;
• join Windows client and test folders permissions: everything is OK;
• enable web proxy with transparent SSL;
• test folders permissions: OK;
• enable web content filter, enable antivirus, save and download Université
  Toulouse in blacklists, edit default filter to block undesired contents,
  create a new filter for a new profile, create a new profile for a specific
  group in DC (in “Who” box choose group@server) and click submit button;
• go to services: squid, squidclamav and c-icap are disabled and stopped;
• go to Windows client and test folders permissions: every folder is
  inaccessible.

I tried one more time, because i notice that nethserver-DC released a new
version, but i got same result.
Cheers,

:

[davidep (Davide Principi)]

Thank you @celiofk for your detailed report! I’ll try to reproduce this behavior. In the meanwhile I hope somebody in @dev_team has an idea about the origin of the problem.

Did you notice anything relevant message in the log files? Could you attach here some log excerpts?

[giacomo (Giacomo Sanchietti)]

I think you hit two different unrelated bugs.

go to Windows client and test folders permissions: every folder isinaccessible.

I can’t reproduce it, check this out: https://github.com/NethServer/dev/issues/5111

go to services: squid, squidclamav and c-icap are disabled and stopped;

Squid is stopped because squidGuard dies with a segfault.
You should find something like this inside the /var/log/messages:

Sep 27 10:40:29 test squid[10716]: Squid Parent: (squid-1) process 10772 started
Sep 27 10:40:29 test kernel: squidGuard[10778]: segfault at ffffffff905c01a0 ip 00007f3f8f6dc782 sp 00007ffd94c39468 error 5 in libc-2.17.so[7f3f8f592000+1b7000]
Sep 27 10:40:29 test kernel: squidGuard[10779]: segfault at ffffffffd981b1b8 ip 00007fa4d8937eec sp 00007fffc14c34b8 error 5 in libc-2.17.so[7fa4d87ed000+1b7000]
Sep 27 10:40:29 test kernel: squidGuard[10781]: segfault at ffffffffb3ca91a0 ip 00007f8bb2dc5782 sp 00007ffc4d94cf38 error 5 in libc-2.17.so[7f8bb2c7b000+1b7000]
Sep 27 10:40:29 test kernel: squidGuard[10780]: segfault at 23fd81b8 ip 00007f9b230f4eec sp 00007fff36b40398 error 4 in libc-2.17.so[7f9b22faa000+1b7000]
Sep 27 10:40:29 test kernel: squidGuard[10782]: segfault at 4d3771a0 ip 00007f604c493782 sp 00007ffd7866c958 error 4 in libc-2.17.so[7f604c349000+1b7000]
Sep 27 10:40:29 test (squid-1): The redirector helpers are crashing too rapidly, need help!
Sep 27 10:40:29 test squid[10716]: Squid Parent: (squid-1) process 10772 exited with status 1
Sep 27 10:40:29 test squid[10716]: Squid Parent: (squid-1) process 10772 will not be restarted due to repeated, frequent failures
Sep 27 10:40:29 test squid[10716]: Exiting due to repeated, frequent failures

Please check that clamd is running along with c-icap

systemctl status c-icap
systemctl status clamd@squidclamav

I have no idea why squidGuard is segfaulting
Edit: Probably this is the upstream bug: https://bugzilla.redhat.com/show_bug.cgi?id=1253662

[giacomo (Giacomo Sanchietti)]

I just opened a new issue, try with the package from testing repository!

Issue: SquidGuard segfault

[alefattorini (Alessio Fattorini)]

@celiofk our devs are super fast! Please help us to test this new package, take a look at this howto before

QA/Testing Team basic HOWTO

The document is moved here but you can still improve the document replying to this discussion https://wiki.nethserver.org/doku.php?id=howto:qa_testing_team_basic_howto_ns7 [image]

Our @quality_team will be happy to help you.

[celiofk (Celio Fukunaga)]

Hi, @giacomo @alefattorini @davidep

I was testing Squid and Squidguard in Virtualbox many times. This is my
last attempt:

• create virtual machine for Nethserver with 20Gb HDD, 1Gb memory and two
  network cards, one bridge and one internal to serve Windows client;
• install Nethserver in unattended mode;
• apply updates in console mode;
• reboot;
• access web interface and make the initial wizard changes;
• configure network with one green static 10.0.0.1/24 and one red DHCP;
• apply DHCP to green interface;
• install nethserver-DC, file server, web filter and web proxy (squidGuard
  package is the new one!);
• go to user an groups and start DC with bridge checked;
• change administrator password;
• create two users with no password expire and no ssh;
• create two groups and insert users;
• create two shared folders for groups with write permission to group owner;
• apply DHCP to bridge interface;
• join Windows client and test write permission on shared folders: OK;
• enable web proxy: transparent with SSL on green and blue and disabled
  cache.
• reboot server;
• go to status, domain accounts: can’t find ldap server, but domain is OK;
• start Windows client and test shared folders permission: have no read
  permission;
• while i wrote this, returned to domain accounts: ldap server is back;
• start Windows client and test shared folders permission: have no read
  permission;

Attached /var/log/messages selected from packages install. I hope it helps.
Cheers,

[celiofk (Celio Fukunaga)]

Hi,

Today I tested SquidGuard.
It doesn’t crash anymore, but I noticed two points:

• if antivirus is disabled, c-icap service doesn’t start and stay disabled
  still enable filter is marked and submitted;
• when create a profile for an ACL group with a custom filter that allow
  all contents, all others groups can bypass the default filter content;
  That’s it.
  Cheers

[giacomo (Giacomo Sanchietti)]

• if antivirus is disabled, c-icap service doesn’t start and stay disabledstill enable filter is marked and submitted;

This is the correct behavior.

• when create a profile for an ACL group with a custom filter that allowall contents, all others groups can bypass the default filter content;

Still can’t reproduce it , I need a little extra time.

start Windows client and test shared folders permission: have no readpermission;

This is unrelated, please open separated threads for different problems.

[celiofk (Celio Fukunaga)]

This is the correct behavior.

OK, c-icap service was disabled and stopped, but in the web content filter page is marked enabled. If I need antivirus enabled to run web content filter, why is there an option to disable it?

This is unrelated, please open separated threads for different problems.

Sorry, my bad. I’ll do it.

[giacomo (Giacomo Sanchietti)]

OK, c-icap service was disabled and stopped, but in the web content filter page is marked enabled. If I need antivirus enabled to run web content filter, why is there an option to disable it?

Sorry, probably I misunderstood what you were saying.
Are you referring to the checkbox under the “Antivirus” tab?

I tried multiple times to enable/disable it, and the underlying configuration is consistent with the checkbox status.

[giacomo (Giacomo Sanchietti)]

• when create a profile for an ACL group with a custom filter that allowall contents, all others groups can bypass the default filter content;

Finally I managed to reproduce it:

Issue: Web filter: can't create profiles involving users

Edit:
The package is ready for testing, would you mind to try it?

yum --enablerepo=nethserver-testing update nethserver-squidguard

[celiofk (Celio Fukunaga)]

Sorry, probably I misunderstood what you were saying.Are you referring to the checkbox under the “Antivirus” tab?

I tried multiple times to enable/disable it, and the underlying configuration is consistent with the checkbox status.

I’m very sorry. I thought that enable filter checkbox was related with c-icap server, but it’s not. Forget about it.

[celiofk (Celio Fukunaga)]

The package is ready for testing, would you mind to try it?

Yes, already tried:

• users are blocked with default content filter;
• users that belong to ACL group in the custom profile should be released, instead are blocked. Maybe related with Squid broken ACL permissions?

[giacomo (Giacomo Sanchietti)]

• users that belong to ACL group in the custom profile should be released, instead are blocked. Maybe related with Squid broken ACL permissions?

I don’t get the scenario.
Please post the output of following commands:

 db contentfilter show
 tail -n 30 /etc/squid/squidGuard.conf

[celiofk (Celio Fukunaga)]

I don’t get the scenario. Please post the output of following commands:

db contentfilter show
tail -n 30 /etc/squid/squidGuard.conf

[root@server ~]# db contentfilter show
admin_filter=profile
Description=
Filter=filter;bypass
Src=group;action_nutri@test.lan
Time=
bypass=filter
BlackList=disabled
BlockAll=disabled
BlockBuiltinRules=disabled
BlockFileTypes=disabled
BlockIpAccess=enabled
Categories=
Description=
WhiteList=disabled
default=filter
BlackList=enabled
BlockAll=disabled
BlockBuiltinRules=disabled
BlockFileTypes=disabled
BlockIpAccess=enabled
Categories=drugs,gamble,games-misc,games-online,hacking,movies,music,porn,radiotv,sex,socialnet,spyware,warez,webphone,webtv
Description=Default filter
Removable=no
WhiteList=enabled
default_profile=profile
Description=Default profile
Filter=filter;default
Removable=no
[root@server ~]# tail -n 30 /etc/squid/squidGuard.conf
}
dest news {
domainlist /var/squidGuard/blacklists/news/domains
urllist /var/squidGuard/blacklists/news/urls
logfile urlfilter.log
}
dest isp {
domainlist /var/squidGuard/blacklists/isp/domains
urllist /var/squidGuard/blacklists/isp/urls
logfile urlfilter.log
}

src src_admin_filter {
userlist /etc/squid/squidGuard/src_admin_filter
}

acl {

# Profile: admin_filter
src_admin_filter  {
    pass !in-addr  all
}

default {
    pass nh_whitelist  !nh_blacklist  !in-addr  !drugs  !gamble  !games-misc  !games-online  !hacking  !movies  !music  !porn  !radiotv  !socialnet  !spyware  !warez  !webphone  !webtv  all
    redirect     http://10.0.0.1/cgi-bin/nethserver-block.cgi?clientaddr=%a&clientname=%n&clientident=%i&srcclass=%s&targetgroup=%t&url=%u
}

}

[celiofk (Celio Fukunaga)]

Is this bug solved in NS7b2?
I’m having same problem in RC2: created a profile that release access to everything for some DC group and users, but all of them are blocked.
Cheers,

[giacomo (Giacomo Sanchietti)]

Sorry but I couldn’t reproduce it.

By the way, we are switch to ufbguard for RC 3.
Take a look at this thread:

Transparent HTTPS proxy

I'd like to change the behavior of the Transparent HTTPS proxy dropping the MITM (Man In The Middle) feature that inspects all the encrypted traffic, substituting it with a new implementation that sniffs only the beginning of the connection to discover the destination website (for filtering purposes). Brief recap: now, when the Web proxy is set to Transparent with SSL, NethServer intercepts traffic on port 443 (HTTPS), connects to the secure web server impersonating the client and decrypts all…

[celiofk (Celio Fukunaga)]

OK, if SquidGuard will be replaced by UFBGuard, I’ll be waiting to test it.