Search Results

Search found 97980 results on 3920 pages for 'code security'.

Page 231/3920 | < Previous Page | 227 228 229 230 231 232 233 234 235 236 237 238  | Next Page >

• 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).

  Read the article

• Very Slow DSL (ethernet) speed [New Interesting Update]

  - by Abhijit

  Very IMPORTANT and INTERESTING UPDATE: Due to some reason I just thought to do a complete new setup and this time I decided to again have openSUSE plus ubuntu. So I first reinstall lubuntu and then I installed OpenSUSE 12.2 (64 bit). Now, my DSL speed is working very normal and fine on opensuse. So this is very scary. Is it possible for any operating system to manipulate my NIC so that it will work fine only on that operating system and not on another os? Regarding positive thinking and not being paranoid, what is it that makes ONLY suse to get my NIC to work at normal speed but ubuntu can not do it? Not even fedora? Not even linux mint? What all these OS are lacking that enables suse to work great? == ORIGINAL QUESTION == I 'was' on opensuse 12.2 when my dsl speed was normal. Yesterday I switched from opensuse to ubuntu 12.04 and speed decreased. It came to range of 7-10-13-20-25-kbps. Then I switch to linux mint, and then to fedora. Still slow speed. When I was in ubuntu I disabled ipv6 but still no luck. Now I am in fedora but this time with DIFFERENT ISP. And still I am getting very slow sped. So my guess is this is nothing to do with os. What can be wrong? Is this problem of NIC? Does NIC speed decreases over time? Does NIC life ends over time as with keyboard or mouse? Help please All the os I used are 64 bit and my laptop is Compaq Presario A965Tu Intel Centrino DUal Core. Interesting thing to notice is I get normal speed while downloading torrent inside torrent client softwares. This slow speed issue applied to download from any web browser or installing software using terminal.

  Read the article

• shut down FTP from IIS 6 after <X> failed login attempts

  - by Justin C

  Is there a setting in IIS 6 to turn an FTP site off after a specified number of failed login attempts? It has already been documented on this site that a Windows server sitting on a static IP address can record tens of thousands of failed login attempts a month. One server I maintain has had tens of thousands of attempts made against the FTP port. I have solid passwords in place, so I am not overly concerned. I rarely have to use the FTP, so for the most part I turn it on and off as I need it. Sometimes though I forget to turn it off when I am done, only to find the next day that my EventLog is full of audit failures. I would want to set a high number, in case I just messed up the password. Something like if 50 failed login attempts happen, just turn off the FTP site. Then if I need it later I can just start it again.

  Read the article

• Which linux x86 hardware keystore?

  - by byeo

  I'm terminating SSL/TLS in my DMZ and I have to assume that machine will be hacked. At which point my certificates are compromised. Previously I've used nCipher hardware keystore/accelerator to solve this issue. These cards won't reveal the private key even to root. The card performs the encryption and decryption onboard and is hardened against physical attack. The only way to get at the keys is by attaching a smart card reader to the card itself. I'm having trouble finding information about something to recreate this approach. Is this the domain of specialist switches and firewalls these days? This old page references some of the old hardware: http://www.kegel.com/ssl/hw.html#cards

  Read the article

• Is RC4 128bit strong enough? [closed]

  - by al nik

  I notice that services like Gmail use RC4 128 bit as encryption. What is RC4 encryption? Is 128-bit RC4 strong enough by today's encryption standards?

  Read the article

• Securing NTP: which method to use?

  - by Harry

  Can someone good at NTP configuration please share which method is the best/easiest to implement a secure, tamper-proof version of NTP? Here are some difficulties... I don't have the luxury of having my own stratum 0 time source, so must rely on external time servers. Should I read up on the AutoKey method or should I try to go the MD5 route? Based on what I know about symmetric cryptography, it seems that the MD5 method relies on a pre-agreed set of keys (symmetric cryptography) between the client and the server, and, so, is prone to man-in-the-middle attack. AutoKey, on the other hand, does not appear to work behind a NAT or a masquerading host. Is this still true, by the way? (This reference link is dated 2004, so I'm not sure what is the state of art today.) 4.1 Are public AutoKey-talking time servers available? I browsed through the NTP book by David Mills. The book looks excellent in a way (coming from the NTP creator after all), but the information therein is also overwhelming. I just need to first configure a secure version of NTP and then may be later worry about its architectural and engineering underpinnings. Can someone please wade me through these drowning NTP waters? Don't necessarily need a working config from you, just info on which NTP mode/config to try and may be also a public time server that supports that mode/config. Many thanks, /HS

  Read the article

• central log-server with auditdisp

  - by johan

  I want to setup a central log-server. The log-server is running with debian 6.0.6 and the audit daemon is installed in version 1.7.13-1. The Clients are running with Red Hat 5.5 and they connect to the log-server via audispd. The connection works fine and i get all messages from each node. My questions is: is it possible that the auditd daemon from the log server write the messages from each node in a separate file? I try to transfer the messages via the syslog daemon, that works but i can not use tools like ausearch to analyze these log-files.

  Read the article

• 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 ;-)

  Read the article

• New Secure Website with Apache Reverse Proxy

  - by jtnire

  I wish to set up a new website that will be accessed by users using HTTPS. I think it is good practise to put the "real" web server in a seperate subnet, and then install an Apache Reverse Proxy in a DMZ. My question is, where should I put the SSL cert(s)? Should I a) Use a self-signed cert on the "real" web server, and a proper cert on the reverse proxy? b) Use 2 real certs on both the "real" web server and the reverse proxy? c) Don't use any cert on the "real" web server, and use a proper cert on the reverse proxy? I'd like to use a) or c), if possible. I also don't want anyone's browser complaining of a self-signed cert. Thanks

  Read the article

• How to open a server port outside of an OpenVPN tunnel with a pf firewall on OSX (BSD)

  - by Timbo

  I have a Mac mini that I use as a media server running XBMC and serves media from my NAS to my stereo and TV (which has been color calibrated with a Spyder3Express, happy). The Mac runs OSX 10.8.2 and the internet connection is tunneled for general privacy over OpenVPN through Tunnelblick. I believe my anonymous VPN provider pushes "redirect_gateway" to OpenVPN/Tunnelblick because when on it effectively tunnels all non-LAN traffic in- and outbound. As an unwanted side effect that also opens the boxes server ports unprotected to the outside world and bypasses my firewall-router (Netgear SRX5308). I have run nmap from outside the LAN on the VPN IP and the server ports on the mini are clearly visible and connectable. The mini has the following ports open: ssh/22, ARD/5900 and 8080+9090 for the XBMC iOS client Constellation. I also have Synology NAS which apart from LAN file serving over AFP and WebDAV only serves up an OpenVPN/1194 and a PPTP/1732 server. When outside of the LAN I connect to this from my laptop over OpenVPN and over PPTP from my iPhone. I only want to connect through AFP/548 from the mini to the NAS. The border firewall (SRX5308) just works excellently, stable and with a very high throughput when streaming from various VOD services. My connection is a 100/10 with a close to theoretical max throughput. The ruleset is as follows Inbound: PPTP/1723 Allow always to 10.0.0.40 (NAS/VPN server) from a restricted IP range >corresponding to possible cell provider range OpenVPN/1194 Allow always to 10.0.0.40 (NAS/VPN server) from any Outbound: Default outbound policy: Allow Always OpenVPN/1194 TCP Allow always from 10.0.0.40 (NAS) to a.b.8.1-a.b.8.254 (VPN provider) OpenVPN/1194 UDP Allow always to 10.0.0.40 (NAS) to a.b.8.1-a.b.8.254 (VPN provider) Block always from NAS to any On the Mini I have disabled the OSX Application Level Firewall because it throws popups which don't remember my choices from one time to another and that's annoying on a media server. Instead I run Little Snitch which controls outgoing connections nicely on an application level. I have configured the excellent OSX builtin firewall pf (from BSD) as follows pf.conf (Apple App firewall tie-ins removed) (# replaced with % to avoid formatting errors) ### macro name for external interface. eth_if = "en0" vpn_if = "tap0" ### wifi_if = "en1" ### %usb_if = "en3" ext_if = $eth_if LAN="{10.0.0.0/24}" ### General housekeeping rules ### ### Drop all blocked packets silently set block-policy drop ### all incoming traffic on external interface is normalized and fragmented ### packets are reassembled. scrub in on $ext_if all fragment reassemble scrub in on $vpn_if all fragment reassemble scrub out all ### exercise antispoofing on the external interface, but add the local ### loopback interface as an exception, to prevent services utilizing the ### local loop from being blocked accidentally. ### set skip on lo0 antispoof for $ext_if inet antispoof for $vpn_if inet ### spoofing protection for all interfaces block in quick from urpf-failed ############################# block all ### Access to the mini server over ssh/22 and remote desktop/5900 from LAN/en0 only pass in on $eth_if proto tcp from $LAN to any port {22, 5900, 8080, 9090} ### Allow all udp and icmp also, necessary for Constellation. Could be tightened. pass on $eth_if proto {udp, icmp} from $LAN to any ### Allow AFP to 10.0.0.40 (NAS) pass out on $eth_if proto tcp from any to 10.0.0.40 port 548 ### Allow OpenVPN tunnel setup over unprotected link (en0) only to VPN provider IPs ### and port ranges pass on $eth_if proto tcp from any to a.b.8.0/24 port 1194:1201 ### OpenVPN Tunnel rules. All traffic allowed out, only in to ports 4100-4110 ### Outgoing pings ok pass in on $vpn_if proto {tcp, udp} from any to any port 4100:4110 pass out on $vpn_if proto {tcp, udp, icmp} from any to any So what are my goals and what does the above setup achieve? (until you tell me otherwise :) 1) Full LAN access to the above ports on the mini/media server (including through my own VPN server) 2) All internet traffic from the mini/media server is anonymized and tunneled over VPN 3) If OpenVPN/Tunnelblick on the mini drops the connection, nothing is leaked both because of pf and the router outgoing ruleset. It can't even do a DNS lookup through the router. So what do I have to hide with all this? Nothing much really, I just got carried away trying to stop port scans through the VPN tunnel :) In any case this setup works perfectly and it is very stable. The Problem at last! I want to run a minecraft server and I installed that on a separate user account on the mini server (user=mc) to keep things partitioned. I don't want this server accessible through the anonymized VPN tunnel because there are lots more port scans and hacking attempts through that than over my regular IP and I don't trust java in general. So I added the following pf rule on the mini: ### Allow Minecraft public through user mc pass in on $eth_if proto {tcp,udp} from any to any port 24983 user mc pass out on $eth_if proto {tcp, udp} from any to any user mc And these additions on the border firewall: Inbound: Allow always TCP/UDP from any to 10.0.0.40 (NAS) Outbound: Allow always TCP port 80 from 10.0.0.40 to any (needed for online account checkups) This works fine but only when the OpenVPN/Tunnelblick tunnel is down. When up no connection is possbile to the minecraft server from outside of LAN. inside LAN is always OK. Everything else functions as intended. I believe the redirect_gateway push is close to the root of the problem, but I want to keep that specific VPN provider because of the fantastic throughput, price and service. The Solution? How can I open up the minecraft server port outside of the tunnel so it's only available over en0 not the VPN tunnel? Should I a static route? But I don't know which IPs will be connecting...stumbles How secure would to estimate this setup to be and do you have other improvements to share? I've searched extensively in the last few days to no avail...If you've read this far I bet you know the answer :)

  Read the article

• Explanation of nodev and nosuid in fstab

  - by Ivan Kovacevic

  I see those two options constantly suggested on the web when someone describes how to mount a tmpfs or ramfs. Often also with noexec but I'm specifically interested in nodev and nosuid. I basically hate just blindly repeating what somebody suggested, without real understanding. And since I only see copy/paste instructions on the net regarding this, I ask here. This is from documentation: nodev - Don't interpret block special devices on the filesystem. nosuid - Block the operation of suid, and sgid bits. But I would like a practical explanation what could happen if I leave those two out. Let's say that I have configured tmpfs or ramfs(without these two mentioned options set) that is accessible(read+write) by a specific (non-root)user on the system. What can that user do to harm the system? Excluding the case of consuming all available system memory in case of ramfs

  Read the article

• How can I stop SipVicious ('friendly-scanner') from flooding my SIP server?

  - by a1kmm

  I run an SIP server which listens on UDP port 5060, and needs to accept authenticated requests from the public Internet. The problem is that occasionally it gets picked up by people scanning for SIP servers to exploit, who then sit there all day trying to brute force the server. I use credentials that are long enough that this attack will never feasibly work, but it is annoying because it uses up a lot of bandwidth. I have tried setting up fail2ban to read the Asterisk log and ban IPs that do this with iptables, which stops Asterisk from seeing the incoming SIP REGISTER attempts after 10 failed attempts (which happens in well under a second at the rate of attacks I'm seeing). However, SipVicious derived scripts do not immediately stop sending after getting an ICMP Destination Host Unreachable - they keep hammering the connection with packets. The time until they stop is configurable, but unfortunately it seems that the attackers doing these types of brute force attacks generally set the timeout to be very high (attacks continue at a high rate for hours after fail2ban has stopped them from getting any SIP response back once they have seen initial confirmation of an SIP server). Is there a way to make it stop sending packets at my connection?

  Read the article

• Why is it good to have website content files on a separate drive other than system (OS) drive?

  - by Jeffrey

  I am wondering what benefits will give me to move all website content files from the default inetpub directory (C:) to something like D:\wwwroot. By default IIS creates separate application pool for each website and I am using the built-in user and group (IURS) as the authentication method. I’ve made sure each site directory has the appropriate permission settings so I am not sure what benefits I will gain. Some of the environment settings are as below: VMWare Windows 2008 R2 64 IIS 7.5 C:\inetpub\site1 C:\inetpub\site2 Also as this article (moving the iis7 inetpub directory to a different drive) points out, not sure if it's worth the trouble to migrate files to a different drive: PLEASE BE AWARE OF THE FOLLOWING: WINDOWS SERVICING EVENTS (I.E. HOTFIXES AND SERVICE PACKS) WOULD STILL REPLACE FILES IN THE ORIGINAL DIRECTORIES. THE LIKELIHOOD THAT FILES IN THE INETPUB DIRECTORIES HAVE TO BE REPLACED BY SERVICING IS LOW BUT FOR THIS REASON DELETING THE ORIGINAL DIRECTORIES IS NOT POSSIBLE.

  Read the article

• 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?

  Read the article

• TCP: Treason uncloaked!

  - by hurikhan77

  On one linux server (Gentoo hardened), we are experiencing bursts of the following messages in dmesg from time to time: TCP: Treason uncloaked! Peer xx.xx.xxx.xxx:65039/80 shrinks window 4094157295:4094160199. Repaired. Is there anything we should take care of or is this normal?

  Read the article

• How do I remove the ServerSignature added by mod_fcgid?

  - by matthew

  I'm running Mod_Security and I'm using the SecServerSignature to customize the Server header that Apache returns. This part works fine, however I'm also running mod_fcgid which appends "mod_fcgid/2.3.5" to the header. Is there any way I can turn this off? Setting ServerSignature off doesn't do anything. I was able to get it to go away by changing the ServerTokens but that removed the customization I had added.

  Read the article

• How to configure mercurial access controls using apache and hgweb?

  - by Gj1

  I have set up a mercurial repo to be served using apache+wsgi+hgweb on OS X. It is now completely open to anyone who stumbles upon my server on the correct port number.. How can I set it up so that only people with a username+password pair that I approve can pull and/or push from the repo? I know how to very easily achieve this using ssh, but in this specific case the requirement is that the solution doesn't require defining full fledged user accounts on the machine for each person whom I'd like to give access to the repo.

  Read the article

• Our server hosting provider asked for our root password

  - by Andreas Larsson

  I work at a company that develops and hosts a small business critical system. We have an "Elastic cloud server" from a professional hosting provider. I recently got an email from them saying that they've had some problems with their backup solution and that they needed to install a new kernel. And they wanted us to send them the root password so they could do this work. I know that the email came from them. It's not [email protected] or anything like that. I called them and asked them about this, and they were like "yep, we need the password to do this". It just seems odd to send the root password over email like this. Do I have any reason to be concerned?

  Read the article

• Rookie file permissions question

  - by Camran

  What is the ending 'r' for and the leading 'd' for in file permissions on Linux? Example: drwxr-xr-x I know about the user, group, others part, and I know w=write, r=read, x=execute. But I don't know about the leading 'd' and the trailing 'r'. Care to explain? Thanks

  Read the article

• Running Radius on a Novell Backbone

  - by YsoL8

  Hello I am a rookie network engineer and I've been asked to create a secure wireless system intergrated with an existing network. So far I'd decided to use 802.1x secuity with a Radius enabled server over a Novell backbone. My question is: does Novell still support this type of server setup? I heard rumours it is at the end of it's supported life and I'd like some confirmation. Also can I get some recommendations on better backbone / server providers. Cheers

  Read the article

• How to set up Drupal Plugin Manager on MAMP in a secure way?

  - by Andrei

  Hi, I use MAMP PRO as global webserver. First of all, is it a good idea? Secondly, my objective is to run a Drupal website with as easy management as possible. Now I want to use Plugin Manager module to install additional modules and themes for my website. It wants to use ftp for that, and I know that if I open access to FTP port then IT-department guys will come to me and ask to shut it down. So I wonder if there is a way to allow Plugin Manager to install modules, having the port 21 closed somehow?

  Read the article

• 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.

  Read the article

• Fix Fatal Error Condition showing system path

  - by JMC

  I've noticed there are a large number of servers running Magento Commerce that will return a fatal error showing the system path: Fatal error: Uncaught exception 'Exception' with message 'File '/usr/local/www/magento/data1702/media/css' does not exists.' in /usr/local/www/magento/data1702/lib/Varien/File/Transfer/Adapter/Http.php:96 Stack trace: #0 /usr/local/www/magento/data1702/get.php(205): Varien_File_Transfer_Adapter_Http->send('/usr/local/www/...') #1 /usr/local/www/magento/data1702/get.php(165): sendFile('/usr/local/www/...') #2 {main} thrown in /usr/local/www/magento/data1702/lib/Varien/File/Transfer/Adapter/Http.php on line 96 Magento as an application is generally good about supressing error messages. How can a linux server running apache be configured to avoid returning this error message since the app has problems suppressing it.

  Read the article

• Strange ssh login

  - by Hikaru

  I am running debian server and i have received a strange email warning about ssh login It says, that user mail logged in using ssh from remote address: Environment info: USER=mail SSH_CLIENT=92.46.127.173 40814 22 MAIL=/var/mail/mail HOME=/var/mail SSH_TTY=/dev/pts/7 LOGNAME=mail TERM=xterm PATH=/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/games LANG=en_US.UTF-8 SHELL=/bin/sh KRB5CCNAME=FILE:/tmp/krb5cc_8 PWD=/var/mail SSH_CONNECTION=92.46.127.173 40814 my-ip-here 22 I looked in /etc/shadow and find out, that password for is not set mail:*:15316:0:99999:7::: I found this lines for login in auth.log n 3 02:57:09 gw sshd[2090]: pam_winbind(sshd:auth): getting password (0x00000388) Jun 3 02:57:09 gw sshd[2090]: pam_winbind(sshd:auth): pam_get_item returned a password Jun 3 02:57:09 gw sshd[2091]: pam_winbind(sshd:auth): user 'mail' granted access Jun 3 02:57:09 gw sshd[2091]: Accepted password for mail from 92.46.127.173 port 45194 ssh2 Jun 3 02:57:09 gw sshd[2091]: pam_unix(sshd:session): session opened for user mail by (uid=0) Jun 3 02:57:10 gw CRON[2051]: pam_unix(cron:session): session closed for user root and lots of auth failures for this user. There is no lines with COMMAND string for this user. Nothing was found with "rkhunter" and with "ps aux" process inspection, also there is no suspicious connections was found with "netstat" (as I can see) Can anyone tell me how it is possible and what else should be done? Thanks in advance.

  Read the article

• tftpd starts randomly

  - by Mutant

  A few days ago my Little Snitch filter starts popping up tftpd. I'd never seen this before, so I immediately start freaking out thinking my Mac has been compromised. I can't find anything unusual on the system. The process usually dies before I can trace it (little snitch never allowed the connection just left the popup up). I finally caught it once, and found this: [10:32]: sudo lsof -nlP | fgrep tftp Password: tftpd 1924 18446744 cwd DIR 1,3 1326 2 / tftpd 1924 18446744 txt REG 1,3 29856 163979456 /usr/libexec/tftpd tftpd 1924 18446744 txt REG 1,3 600576 163686622 /usr/lib/dyld tftpd 1924 18446744 txt REG 1,3 303300608 189014898 /private/var/db/dyld/dyld_shared_cache_x86_64 tftpd 1924 18446744 0u IPv4 0x34a76100fcbb06e3 0t0 UDP *:55818 tftpd 1924 18446744 2u IPv4 0x34a76100f1113c53 0t0 UDP *:69 [10:32]: ps ax | fgrep 1924 1924 ?? S 0:00.00 /usr/libexec/tftpd -i /private/tftpboot 1949 s000 S+ 0:00.00 fgrep 1924 For the life of me I can't figure out what is starting this. Nothing in cron, launchdaemons, etc. Google searches haven't yielded much either. The connection IP is different each time. So my question is: Has anyone seen anything like this before?

  Read the article

< Previous Page | 227 228 229 230 231 232 233 234 235 236 237 238  | Next Page >