Questions tagged [filter]

Usually related with text filtering of some kind, like logs. This may also refer to email filtering. Note that there are other tags that are more appropriate for network and spam filtering.

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Error when running a wasm filter module in an istio proxy

I followed this article to set up my wasm module and run it using an istio proxy like this: wasme deploy envoy wasm_filter_intro:v0.1 --envoy-image=istio/proxyv2:1.17.3 Unfortunately, it fails and ...
devio's user avatar
  • 101
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0 answers
145 views

How to assign filtered column data to a variable using Set in VBA excel?

I am newbie to VBA excel. I am trying to use Set to assign some data from a filtered column (through AutoFilter) to a variable (X in this case). Below shows the code and image of the table. Sub Test() ...
Handsome Teh's user avatar
0 votes
0 answers
33 views

Reordering Apache Output Filters

Is there a way to reorder the output filters for Apache 2.4? I am forced to use something like this because DEFLATE runs before SUBSTITUTE: AddOutputFilterByType INFLATE;SUBSTITUTE;DEFLATE text/html (...
user193130's user avatar
1 vote
1 answer
1k views

Nexus docker repository - anonymous access to selected artefacts

Use case: allow to pull selected (e.g. tagged as *-public) Docker Images anonymously. Otherwise credentials are required. Given: latest Nexus 3.52.0, it works with a docker login and LDAP credentials ...
Aleksejs Spiridonovs's user avatar
0 votes
0 answers
36 views

Is it possible to configure default email filters for users?

We have about 500 students and 50 personel. We use Outlook email. Students and personel have different domains. Students' domain contains "edu." but personels domain doesn't. Is it possible ...
Ohto Nordberg's user avatar
2 votes
1 answer
72 views

How to skip a message matching a certain pattern if it repeats more often than a limit?

Is it possible to stop a matching message if it appears more frequently than a given limit? I'd like to achieve something like this: if $programname == "foo" and $msg contains "bar&...
Petr's user avatar
  • 635
27 votes
3 answers
17k views

What is the difference between 0.0.0.0/0 and 0.0.0.0/1?

In the history, I mostly used 0.0.0.0/0 for "match every IP address". Recently, I saw a 0.0.0.0/1 subnet filter. What is the difference between 0.0.0.0/0 and 0.0.0.0/1 and what's the ...
Arakis's user avatar
  • 391
1 vote
2 answers
355 views

What Ansible filter can I use on 'hostvars' to extract string?

"{{ hostvars['DUMMY_HOST']['iosengineID'] }}" value returns this {'msg': [['80000009045B575A5032333331303055565D']], 'failed': False, 'changed': False} Which filter can I use extract or ...
Andreas's user avatar
  • 11
1 vote
1 answer
71 views

Could someone please explain the difference between these expressions

drop proto tcp and not (dst port 80) pass proto tcp and dst port 80 Is there a difference between them?
Do - Magedon's user avatar
2 votes
2 answers
360 views

rsync all pdfs except in certain directories?

I'm trying hard to understand the rsync filter system, and it's completely baffling me. I have the following "test" directory structure to try to make sense of it. With no filter options ...
pixelearth's user avatar
1 vote
1 answer
1k views

Create own filter for fail2ban fails

I'm playing around with fail2ban in kubernetes. For that I created a pod that creates fake log messages: 2021-08-04 18:33:13 Authentication failed 15.15.15.15 I created a custom filter, to test if ...
hobyte's user avatar
  • 111
0 votes
3 answers
274 views

Tag External Emails from NEW external addresses

We work with a giant company that prepends an email tag to every externally originating (to them) email that goes something like: "Warning, this email originated outside your organization - don't ...
Thomas Bailey's user avatar
1 vote
0 answers
146 views

LVM filter does not stop when rule matches?

I have a problem with a lvm filter configuration. I want to filter out certain devices/partitions from lvm scan. I can do it by making filter like so: filter = ["a|/dev/disk/by-partuuid/<uuid&...
Iluvatar's user avatar
  • 121
1 vote
0 answers
237 views

How to replace multiple letters in an variable in Sieve?

I want to use my catch-all-email to put emails in their corresponding folders. So if I were to sign up for twitter I'd use [email protected]. Currently I have this script: if address :matches ["...
StackHogger's user avatar
0 votes
1 answer
147 views

Compare url link and url text in email body and reject as SPAM

Email body: ... <a href="url">text</a> ... Is it possible check if text is url in email body, then compare url and text and reject as SPAM if they differ?
user1855805's user avatar
0 votes
1 answer
4k views

rsyslog single filter conditional syntax

I'm looking for a way to write a single rule with multiple match values, don't write those rows to logfile if the message contain first word or second word. This works but isn't DRY: if $msg contains &...
user2239318's user avatar
1 vote
1 answer
3k views

Fail2ban how to configure custom fail regex filter

I am running fail2ban on Debian 9 and am trying to create a custom filter to ban an ip after 4 failed attempts. Can someone help to figure out what I need to put in filter.d and jail.conf in order ...
Petrushka's user avatar
1 vote
1 answer
836 views

Allow certain users to only send emails to specific domains

I have an email server with several domain and users. I need block certain users from sending emails, but allow them to email specific domains. Example: [email protected] block all outgoing emails ...
Charles C.'s user avatar
0 votes
1 answer
212 views

Postfix: processing incoming mail for virtual user

This discussion on Dovecot ML suggests to use for filtering mail for foo user foo: | /path/to/the/external/program in /etc/aliases. But aliases work only for local user. How to filter with script mail ...
pevik's user avatar
  • 294
0 votes
1 answer
1k views

Powershell Select-String on a File Adds Unwanted Metadata

I'm trying to filter out service accounts in a file containing user accounts, one per line: "svc.test" "test.user" "test.user2" Select-String adds unwanted metadata: C:\...
wirelessben's user avatar
0 votes
1 answer
42 views

Spam filtering based on average ascii score

I'm trying to come up with a new spam filter based on what has been coming through our filter lately. A lot of the messages have subject lines like: "Re: ᴢᴀɴᴛᴀᴄ 【ʜᴀs】 ʙᴇᴇɴ ʟɪɴᴋᴇᴅ 【ᴛo】 ᴄᴀɴᴄᴇʀ&...
Phalse Impressions's user avatar
2 votes
0 answers
1k views

Using tc to delay packets to several ports

After reading several pages like this this and without having a really deep knowledge about the kernel Linux, I am able to filter up to 3 ports using just the three first leaves of the tree. tc qdisc ...
David_helo's user avatar
2 votes
0 answers
813 views

TC Filter With BPF and NFTables Packet Marking

I made a TC BPF ingress program and I want it to process specific packets only marked by NFTables. Here's my NFTables table that marks the specific packets: table ip compressor_tc { chain ...
Christian Deacon's user avatar
0 votes
2 answers
2k views

How to write a complex filter in tomcat web.xml to accept partially a URL?

I am new to tomcat and I need to filter the URLs on a server to accept all clients for some URLs and accept only a specific IP for other URLs. In details, I want to accept ALL clients for for this ...
Gilbert's user avatar
0 votes
0 answers
334 views

how to apply TC htb class to each of IPs in an IP range separately?

I use HTB for TC and mark packets with iptables. First I mark a range of IPs (like 192.168.1.0/24). Now I want to apply a htb class to each of these IPs separately. If I add a class and a filter for ...
amirhossein nasseri's user avatar
0 votes
1 answer
293 views

How to filter by status information column in Thruk

I am using Thruk as a monitoring interface. At the top left corner of the page there is a button which opens a stack with filters of which hosts/services etc. you want to apply. You can easily add ...
Ashark's user avatar
  • 346
0 votes
1 answer
6k views

Microsoft AD - Negative OU= LDAP filter

I am trying to produce a LDAP Filter for MS AD which filters users based on some OUs (in my case excluding a specific OU but also including does not work): (&(cn=Testuser1)(|(ou:dn:=Included1)(ou:...
eckes's user avatar
  • 845
1 vote
1 answer
716 views

Spamassasin rule to flag certain MX IPs

I've noticed a flood of spam that is related to the same range of IPs. All the spam email has different HTML text (which is english but meaningless) and a few embedded pictures (which I block) but ...
Jay M's user avatar
  • 398
0 votes
1 answer
454 views

Filter ss process output without using grep

ss -p can give the process name, process id (PID) and the file descriptor associated with the connection. Example: ss -tuanp [...] tcp ESTAB 0 0 x.x.x.x:59594 x.x.x.x:993 users:(("...
wget's user avatar
  • 307
1 vote
1 answer
2k views

Not logic in docker filter

I have a named container that may or may not be up and if it is up I want to be able to kill all the containers but that one by name. Basically what I want is: docker kill $(docker ps -aq --filter="...
Itay Weiss's user avatar
0 votes
0 answers
144 views

Why can't block specified string with iptables command?

I want to block any packages flow into my pc which contains the string porn. iptables -A INPUT -m string --algo bm --string "porn" -j DROP Open my firefox and iniput keyword porn in google search ...
scrapy's user avatar
  • 337
0 votes
1 answer
122 views

tc filter ... ht HANDLE ... does not allow buckets of 8 bits

TC-u32 man page states that HANDLE is: HANDLE := { u12_hex_htid:[**u8_hex_hash:[u12_hex_nodeid]** | 0xu32_hex_value } so the size of the bucket should range from 0x00 to 0xff as it is a u8 value. ...
Ethy's user avatar
  • 11
0 votes
1 answer
182 views

How to configure postfix/dovecot setup to reject certain mail for certain users/accounts

I'd like to be able to reject email from certain users or if it contains certain strings or if the title matches something for certain users. I'm in a multidomain enviroment. Is this possible? ...
propagare's user avatar
0 votes
1 answer
486 views

exim filter not working on long emails

I was trying to set a file extension based filter in exim. if $message_body contains "pdf.gz" or $message_body contains "pdf.arj" This filter does work on small mail, such as mail with only test ...
Dirty_Programmer's user avatar
0 votes
1 answer
470 views

Is it possible to redirect DNS quries to different URL/DNS like opendns

I have an unbound DNS Resolver in my office lab. I m using this service to block ads and unwanted domains. Is there any possibilities to redirect DNS quires to a specific URL/DNS that shows the site/...
James Arems's user avatar
1 vote
1 answer
2k views

How to debug Mikrotik bridge filter forward rules not having any effect?

As part of diagnosing a different problem were trying to add a bridge filter rule that will stop all traffic from forwarding between two interfaces on a bridge. The router has two interfaces ether1 ...
Arthur Ulfeldt's user avatar
0 votes
1 answer
258 views

fail2ban filter matches no lines for xmlrpc attack

I'm trying to jail hosts that brute-force attack a web server, thereby creating (hundreds of) lines in /var/log/apache2/error.log of the form [Fri Feb 01 11:17:56.158739 2019] [:error] [pid 15870] [...
Camille Goudeseune's user avatar
0 votes
1 answer
668 views

exim filter regex discard rule

We are trying to discard all emails with a matching subject, example of subject: Subject: DOMAIN.COM Alert: NAME We have NOT received your payment We are trying to match any domain, Alert, and "We ...
JCats's user avatar
  • 87
0 votes
1 answer
1k views

Apply Network Filter to Ovirt Guest without Rebooting

I am trying to change the clean-traffic IP address for a oVirt Guest VM. It works as long as I reboot the VM. ( Changed from within the Guest Virtual Machine Network Settings ) But for a production ...
Rahim Khoja's user avatar
0 votes
1 answer
812 views

Exim filter - Matching FROM and TO

I have been receiving a lot of mailer-daemon spam lately ... It's obvious the spammer is spoofing the to & from fields so that mailer-daemon kicks in and delivers the actual message to me. I ...
Chad's user avatar
  • 1
1 vote
1 answer
430 views

fail2ban filter for common apache exploits

Every day I see hackers/script kiddies looking for url's like: /webdav /site.tar /admin /htdocs.php etc. They sometimes hit my sites for several minutes looking for common exploits. Is there a ...
TSG's user avatar
  • 1,852
0 votes
1 answer
2k views

Get mac address based on ip in filter wireshark

i am a test engineer writing some test cases. I am trying to write a test which has to be performed in wireshark. However, my collegues aren't that "into wireshark" and i would like to keep it as ...
tomvda's user avatar
  • 101
0 votes
1 answer
402 views

Exim filter TLD block is blocking more than just the TLD

Need to discard emails to and from ending in a specific TLD but having an issue, example of a filter: if first_delivery and ("$h_to:, $h_cc:" contains ".win$") or ("$h_from:" contains ".win$") then ...
JCats's user avatar
  • 87
2 votes
1 answer
1k views

tc/netem filter explenation

Iam new to tc and i find it mighty confusing, i was able to find and bit understand little command flow, to issue delay on specific IP, but i dont tink it works properly - delaying all traffic ...
J B's user avatar
  • 93
0 votes
1 answer
485 views

Filter log for a location but allow passing request to proxy

I know how to filter logs for a location: # inside a http block log_format filter '0.0.0.0 - $remote_user [$time_local] "$request"' '$status $body_bytes_sent ' '"$...
devius's user avatar
  • 487
1 vote
1 answer
366 views

Filtering dpkg logs in syslog-ng

I am new to syslog-ng, and I am setting a syslog-ng, where I am receiving logs of syslog, auth.log and dpkg.log. Although I was able to get the logs for syslog and auth.log, but I am unable to write ...
Bidyut's user avatar
  • 121
1 vote
1 answer
68 views

Fold burst of many emails into one?

We are running an SGE job scheduling system. Users can let SGE send out emails in case of jobs being cancelled. In the case of a user having large array jobs (say 100'000k entries) and killing all of ...
Manuel's user avatar
  • 111
3 votes
1 answer
602 views

Toggle postfix on and off

There's probably an answer to this already, but I just can't figure out how to search for it correctly. Situation: We have a failover situation for two nodes, using keepalived, passing a floating IP ...
Ross Presser's user avatar
2 votes
2 answers
923 views

Powershell script - Find LogOn attribute - How from specific OU?

This is the PowerShell script I use to find the LogOn attribute from users in Active Directory. Now rather than getting all users I want it to search only in a specific OU. The domain looks like this: ...
DirkW's user avatar
  • 21
1 vote
0 answers
564 views

Correct filtering of raw devices which are multipath components out of LVM

I have a HP MSA P2000 FC with dual controllers, dual HP SAN switches and a couple of servers with QLogic "ISP2532-based" 8G dual-port cards. Everything is connected "each to each" way. The OS is ...
Nikita Kipriyanov's user avatar