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  • Avoiding users to corrupt and use a script

    - by EverythingRightPlace
    Is it possible to deny the right to copy files? I have a script which should be executable by others. They are also allowed to read the file (though it would not be a problem to forbid reading). But I don't want the script to be changed and executed. It's not a problem to set those permissions, but one could easily copy, change and run the script. Can this even be avoided? /edit The OS is Red Hat Enterprise Linux Workstation release 6.2 (Santiago).

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  • Adjust iptables

    - by madunix
    cat /etc/sysconfig/iptables: # Firewall configuration written by system-config-securitylevel # Manual customization of this file is not recommended. *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] :RH-Firewall-1-INPUT - [0:0] -A INPUT -j RH-Firewall-1-INPUT -A FORWARD -j RH-Firewall-1-INPUT -A RH-Firewall-1-INPUT -i lo -j ACCEPT -A RH-Firewall-1-INPUT -p icmp --icmp-type any -j ACCEPT -A RH-Firewall-1-INPUT -p 50 -j ACCEPT -A RH-Firewall-1-INPUT -p 51 -j ACCEPT -A RH-Firewall-1-INPUT -p udp --dport 5353 -d X.0.0.Y -j ACCEPT -A RH-Firewall-1-INPUT -p udp -m udp --dport 631 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 443 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m tcp -s X.Y.Z.W --dport 3306 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp -s M.M.M.M --dport 3306 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 21 -j ACCEPT -A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited COMMIT I have the above following IPtables on my linux web server(Apache/MySQL), I want to have the following: Block any traffic from multiple IP's to my web server IP1:1.2.3.4.5, IP2:6.7.8.9 ..etc Limiting one host to 20 connections to 80 port, which should not affect non-malicious user, but would render slowloris unusable from one host. Limit MYSQL port 3306 access on my server only to the following IP range A.B.C.D/255.255.255.240 Block any ICMP traffic.

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  • Protecting a SVN server

    - by user35072
    For various reasons we are finding it increasingly difficult to work with remote workers. We are a very small developer shop and it's becoming impractical to do manual merges on a daily basis. So we're left with little choice (?) but to consider opening up our SVN servers. I'm looking into the following: Full HTTPS session Running non-80 port Strong password policy Is this enough to prevent someone hacking and stealing data? I will also look into VPN but first would like to understand any alternative solutions.

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  • Win7 UAC tokens

    - by Talc
    It is known that under win7 UAC you receive 2 tokens when you logon to the system: std user token and admin token. If I disable UAC, what should I get? only admin token? or still both with no consideration to the UAC status?

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  • Client-side certificates

    - by walshms
    My company purchased a wildcard certificate from a vendor. This certificate was successfully configured with Apache 2.2 to secure a subdomain. Everything on the SSL side works. Now I'm required to generate x509 client-side certificates to issue for this subdomain. I'm following along this page: (http://www.vanemery.com/Linux/Apache/apache-SSL.html), starting with "Creating Client Certificates for Authentication". I've generated the p12 files and successfully imported them into Firefox. When I browse to the site now, I get an error in FireFox that says "The connection to the server was reset while the page was loading." I think my problem is coming from not signing the client-side correctly. When I sign the client-side certificate, I'm using the PEM file (RapidSSL_CA_bundle.pem) from RapidSSL (who we bought the certificate from) for the -CA argument. For the -CAkey argument, I'm using the private key of the server. Is this correct?

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  • strategy /insights for avoiding document content loss due to encryption

    - by pbernatchez
    I'm about to encourage a group of people to begin using S-Mime and GPG for digital signatures and encryption. I foresee a nightmare of encrypted documents which can no longer be recovered because of lost keys. The thorniest issue is archiving. The natural way to preserve privacy in an archive is to archive the encrypted document. But that opens us up to the risk of a lost key when time comes to unarchive a document, or a forgotten password. After all it will be a long way in the future. This would be equivalent to having destroyed the document. First thought is archiving keys with documents, but that still leaves the forgotten pass phrase. Archiving the passphrase too would be tantamount to archiving in the clear. No privacy. What approaches do you use? What insights can you offer on the issue?

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  • Why obfuscating a serial number of a device? What is the risk?

    - by Horst Walter
    In one of my xx.stackexchange questions I've got an answer, in which the user has obfuscated his disk's SN (serial number). Recently I have seen this in several photos as well, the SN was blurred out. I' am just curious, because I have never paid attention to this. What could be the potential risk in publishing a device's SN? I do see some sense when it comes to a MAC address, OK, this could be used for tracking. But a SN of a disk, iPad, whatsoever? Maybe there is an important reason for not publishing it, which I haven't seen so far.

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  • IIS and PHP restrict IO permissions

    - by ULTRA_POROV
    I have php installed trough a fastCGI module. Is there a way to restrict the module (php.exe) read / write permissions to only the directory (+ subdirs) of the IIS site that is calling it? I need this to prevent one IIS PHP site from having access to files outside its own directory. How to do this? Is there a setting in php.ini or in the IIS configuration? I believe such a feature could exist, because when a file on the server is requested the root path of the site is also known, all it would take is that IIS passes this path to the php module, and the php module should on its end allow only IO operations within this path. PS: I know it is possible to achieve this by using a different windows account for each website, this is not an option.

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  • How to secure svn+ssh checkout users?

    - by vvanscherpenseel
    All our SVN repositories are hosted on a dedicated machine on which all the developers have access. Every now and then we need to checkout a repository on a machine we don't own or operate ourselves. Currently we all use our own system (SSH) account for this, but instead I would like to use some generic 'checkoutsvn' user that can be used for this. This user is only used for checking out from a repository, but should not be allowed to log in to the system (no shell access). I tried to do this by setting the default shell of that account to /sbin/nologin but then SVN fails, as apparently svn+ssh requires shell access. How do you do this? Is there a good solution for this?

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  • What is the right iptables rule to allow apt-get to download programs?

    - by anthony01
    When I type something like sudo apt-get install firefox, everything work until it asks me: After this operation, 77 MB of additional disk space will be used. Do you want to continue [Y/n]? Y Then error messages are displayed: Failed to fetch: <URL> My iptables rules are as follows: -P INPUT DROP -P OUTPUT DROP -P FORWARD DROP -A INPUT -i lo -j ACCEPT -A OUTPUT -o lo -j ACCEPT -A INPUT -p tcp --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT -A OUTPUT -p tcp --sport 80 -m state --state ESTABLISHED -j ACCEPT What should I add to allow apt-get to download updates? Thanks

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  • Is it possible to detect that a database connection is to a copy rather than to the original database?

    - by user149238
    I have an application that needs to know if it is connected to the original database that it was installed with or if the connection is to a copy of that database. Is there any known method to know if the database has been cloned and the application is no longer connected to the original? I am specifically interested in MS SQL Server and Oracle. I was kicking ideas around for a stored procedure but that most likely doesn't have access to the hardware to confirm unique hardware information that would somewhat guarantee that the database is the one that it was originally connected to during installation. I'm trying to prevent/detect cloning of a database so that there is only 1 "true location of truth". Thanks!

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  • How can I restrict the backuppc client user as much as possible? (rsync)

    - by jxn
    I have backuppc making full backups of servers, but I'd like to be sure that my set up is as paranoid as possible. BackupPC is set up to backup via rsync, and it is set up to use a specific user on each client to be backed up. Because the backuppc client user has to have access to every file on the client machine and the ability to ssh into the machine without an interactive password, I'm a little nervous about securing the clients, and I'd like to know I haven't overlooked any options. Here's what I have in place: in the client user's authorized_keys file, i've included from="IPTOSERVER",command="/usr/bin/rsync" before the user's public key, so that the user can only login coming from the BackupPC server. Next, in the sudoers file, I've added this line: backuppc ALL=NOPASSWD: /usr/bin/rsync to allow root-level permissions only for the rsync command for that user. Are there other user, policy, or ssh restrictions that I can add while still allowing the backup pc client user to rsync all files?

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  • configuring linux server firewall to allow acces on a certain range of IP addresses

    - by eggman20
    Hi Guys, I'm new to linux server. I'm currently trying to get an Ubuntu 10.10 server up and running for the first time and I'm using Webmin for administration. I'm stuck on the setting up the firewall. What I need to do is to ONLY allow a range of IPs (e.g 128.171.21.1 - 128.171.21.100) to access the HTTP server and Webmin. I've seen a lot of tutorials but none of them fits what I needed. Thanks in advance!

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  • How to disabled password authentication for specific users in SSHD

    - by Nick
    I have read several posts regarding restricting ALL users to Key authentication ONLY, however I want to force only a single user (svn) onto Key auth only, the rest can be key or password. I read How to disable password authentication for every users except several, however it seems the "match user" part of sshd_config is part of openssh-5.1. I am running CentOS 5.6 and only have OpenSSH 4.3. I have the following repos available at the moment. $ yum repolist Loaded plugins: fastestmirror repo id repo name status base CentOS-5 - Base enabled: 3,535 epel Extra Packages for Enterprise Linux 5 - x86_64 enabled: 6,510 extras CentOS-5 - Extras enabled: 299 ius IUS Community Packages for Enterprise Linux 5 - x86_64 enabled: 218 rpmforge RHEL 5 - RPMforge.net - dag enabled: 10,636 updates CentOS-5 - Updates enabled: 720 repolist: 21,918 I mainly use epel, rpmforge is used to the latest version (1.6) of subversion. Is there any way to achieve this with my current setup? I don't want to restrict the server to keys only because if I lose my key I lose my server ;-)

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  • Dealing with SMTP invalid command attack

    - by mark
    One of our semi-busy mail servers (sendmail) has had a lot of inbound connections over the past few days from hosts that are issuing garbage commands. In the past two days: incoming smtp connections with invalid commands from 39,000 unique IPs the IPs come from various ranges all over the world, not just a few networks that I can block the mail server serves users throughout north america, so I can't just block connections from unknown IPs sample bad commands: http://pastebin.com/4QUsaTXT I am not sure what someone is trying to accomplish with this attack, besides annoy me. any ideas what this is about, or how to effectively deal with it?

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  • nginx with fail2ban and mod_security

    - by Mahesh
    I forgot to update my fail2ban config for nginx. I just moved to nginx from apache. Today, I got a lot of cals from a single IP. IP tried to access login pages with post and get methods IP tried to use nginx as a proxy (GET http:/...) IP searched images, js, css folders IP tried to inject -d url_allow_fopen =1 and something similar. Most of the calls ended with 404. http { limit_req_zone $binary_remote_addr zone=app:10m rate=5r/s; ... server { ... location / { limit_req zone=app burst=50; } I got approximately 50 requests from that ip for a second. So i updated my nginx like the above. Will it avoid too many connections per second now? I have updated my fail2ban jail.local to support nginx. I am confused with the nginx-noscript.conf [Definition] failregex = ^<HOST> -.*GET.*(\.php|\.asp|\.exe|\.pl|\.cgi|\scgi) ignoreregex = I am serving php with nginx. I checked apache's noscript.conf and which has .php extension on it too. I tested this above settings before restarting fail2ban and got thousands of ips matched. I removed php and nothing matched. Do i need .php| in nginx-noscript.conf? Using mod_security and fail2ban together bring any problem? When i was searching today, i came to know mod_security is available for nginx too. So i am planning to use it too.

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  • Cannot access an application folder in Program files

    - by GiddyUpHorsey
    I recently installed Windows 7 Professional 64bit on a new machine. I installed an application using a ClickOnce installer. The application runs fine, but I cannot access the application folder it created in c:\Program files (x86). It bombs with access denied. I try to view the properties on the folder and it takes about 1 minute to display (other folders take 1 second). It says I cannot view any information because I'm not the owner. It doesn't say who the current owner is (instead - Unable to display current owner.) but says I can take ownership. When I try it fails again with Access Denied, even though I have administrative permissions. Why can't I access this folder nor take ownership?

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  • Unix Server Protection from Physical Access?

    - by Isabella Wilcox
    I'm working to license our software to some buyer. Our software will be ran from an unix server that is physically controlled by the buyer. Is there any way to prevent the buyer who have physical access to your server to access contents on the drive? We want to protect our intellectual property because if the buyer steals our software, we won't have enough legal resources to pursue a claim internationally.

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  • File permissions on web server

    - by plua
    I have just read this useful article on files permissions, and I am about to implement a as-strict-as-possible file permissions policy on our webserver. Our situation: we have a web server accessed through sftp by different users from within our company, and we have the general public accessing Apache - sometimes uploading files through PHP. I distinguish folders and files by their use. So based on this reading, here is my plan: All people who need to upload files will have separate users. But all of those users will belong to two groups: uploaders, and webserver. Apache will belong to the group webserver. Directories Permission: 771 Owner: user:uploaders Explanation: to access files in the folder, everybody needs to have execute permission. Only uploaders will be adding/removing files, so they also get r+w permission. Files within the web-root Permission: 664 Owner: user:uploaders Explanation: they will be uploaded and changed by different users, so both owner and group need to have w+r permissions. Webserver needs to only read files, so r permission only. Upload-directories Permission: 771 Owner: user:webserver Explanation: when files need to be uploaded, Apache needs to be able to write to this directory. But I figure it is safer to change the owner to webroot, thus giving Apache sufficient privileges (and all uploaders also belong to this group and will have the same permissions), while safeguarding from "others" writing to this folder. Uploaded files Permission: 664 Owner: user:webserver Explanation: after uploading Apache might need to delete files, but this is no problem because they have w+r permission of the folder. So no need to make this file any more accessible than r access for group. Being not an expert on file permissions, my question is whether or not this is the best possible policy for our situation? Any suggestions welcome.

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  • Simple secured SFTP tunnel?

    - by babonk
    I'd like to setup an sftp tunnel so that I can connect to an IP-secured SFTP server through a gateway computer from anywhere, and download the files to anywhere. I was thinking of using a combination with netcat, having it listen to either WinSCP or PuTTY sFTP (doesn't matter which). Not sure how I would download the files to the connecting computer though. I would like the tunnel to be secured, preferably, with a username/password. I'm open to using alternative software but I'm looking for unintrusive, simple command line stuff because I don't want to install a lot on this computer. Thanks

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  • What statistics app should I use for my website?

    - by Camran
    I have my own server (with root access). I need statistics of users who visit my website etc etc... I have looked at an app called Webalyzer... Is this a good choice? I run apache2 on a Ubuntu 9 system... If you know of any good statistics apps for servers please let me know. And a follow-up question: All statistics are saved in log-files right? So how large would these log-files become then? Possibility to split them would be good, dont know if this is possible with Webalyzer though...

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