Pour finir, la communauté autour de ce système est énorme tout comme le wiki & le forum qui sont une sorte de bible pour les utilisateurs de Linux. To mount Samba shares from a server as a regular user: This allows all users who are members of the group users to run the commands /sbin/mount.cifs and /sbin/umount.cifs from any machine (ALL). It is a best practice to turn a computer completely off at times it is not necessary for it to be on, or if the computer's physical security is temporarily compromised (e.g. [5]. Linux Kodachi uses a customized Xfce desktop and aims to give users access to a wide variety of security and privacy tools while still being intuitive. Exporting EDITOR=nano visudo is regarded as a severe security risk since everything can be used as an EDITOR. Je crois que c’est « visudo » tout court, pas « visudo /etc/sudoers ». Data-at-rest encryption, preferably full-disk encryption with a strong passphrase, is the only way to guard data against physical recovery. This page describes security packaging guidelines for Arch Linux packages. This ruleset, in contrast to DAC methods, cannot be modified by users. Les commandes suivantes ne sont pas correctes pour de l’UEFI. Voici les caractéristiques de la machine : Si vous n’utilisez pas de VM vous pouvez créer une clé USB bootable avec la commande « dd » suivante : Il faudra remplacer « xxx » par votre clé USB. If anything sounds too good to be true, it probably is! Google Authenticator provides a two-step authentication procedure using one-time passcodes (OTP). Potential file system mounts to consider: The default file permissions allow read access to almost everything and changing the permissions can hide valuable information from an attacker who gains access to a non-root account such as the http or nobody users. Bonjour à tous ! They can be used as internal smartcards, attest the firmware running on the computer and allow users to insert secrets into a tamper-proof and brute-force resistant store. "V1del Forum Moderator Registered: 2012-10-16 Posts: 12,275 Re: Spectre exploits in the wild and Arch Linux security Spectre should already be mitigated by current microcode updates and kernels." It is important to regularly upgrade the system. Arch uses package signing by default and relies on a web of trust from 5 trusted master keys. Après un petit moment d’absence nous allons voir aujourd’hui comment essayer de détecter une intrusion sur un système GNU/Linux. For C/C++ projects the compiler and linker can apply security hardening options. I finally got the Arch Linux lanyard I've always wanted! Arch Linux by default applies PIE, Fortify source, stack protector, nx and relro. The purpose of this is to add an additional layer of security before a user can completely compromise your system remotely. Some password managers also have smartphone apps which can be used to display passwords for manual entry on systems without that password manager installed. See faillock.conf(5) for further configuration options, such as enabling lockout for the root account, disabling for centralized login (e.g. Ou alors: visudo -f /mon/fichier/sudoers/specifique The biggest threat is, and will always be, the user. Make sure that at least one copy of the data is stored offline, i.e. login and sudo), public key authentication over SSH is still accepted. Once the computer is powered on and the drive is mounted, however, its data becomes just as vulnerable as an unencrypted drive. $ checksec --file=/usr/bin/cat Publié par Mickael Rigonnaux le 6 janvier 20206 janvier 2020. This allows the kernel to restrict modules to be only loaded when they are signed with a valid key, in practical terms this means that all out of tree modules compiled locally or provides by packages such as virtualbox-host-modules-arch cannot be loaded. The default domain name resolution (DNS) configuration is highly compatible but has security weaknesses. Bonjour, This forms the fundamental root of trust of most modern computers and allows end-to-end verification of the boot chain. Using sudo for privileged access is preferable to su for a number of reasons. It allows you to set either a per-menu-item password or a global bootloader password. Passwords are a balancing act. Following the principle of least privilege, file systems should be mounted with the most restrictive mount options possible (without losing functionality). However, it also provides a means by which a malicious process can read data from and take control of other processes. Ubuntu, ouais pas mal mais ça m a vite saoulé , Mint est très bien faite , mais je suis passé à autre chose , Makulu Linux Petite coquille: le pilote libre pour une carte graphique nvidia n’est pas intel (et pour amd/ati il y en a différent en fonction de l’architecture de la carte vidéo). Arch Linux (/ ɑːr tʃ /) is a Linux distribution for computers with x86-64 processors. Note that a password manager introduces a single point of failure if you ever forget the master password. Alors moi j ai débuté directement sur Mandriva 2008.1 ( normalement on débute sur Ubuntu ) This can be prevented by installing a DNS caching server, such as dnsmasq, which acts as a proxy. However, filling /var or /tmp is enough to take down services. Secure Boot is a feature of UEFI that allows authentication of the files your computer boots. Je ne touche jamais à la valeur adjtime. Aujourd’hui un article sur un outil très intéressant que j’utilise tous les jours depuis maintenant 2 ans. The proc group, provided by the filesystem package, acts as a whitelist of users authorized to learn other users' process information. Par exemple Tutanota à la place de Gmail, LibreOffice à la place d’Office, Linux à la place de Windows, etc. See also #Restricting root. It is important to only bind these services to the addresses and interfaces that are strictly necessary. This helps preventing some evil maid attacks such as replacing files inside the boot partition. The passwords are also salted in order to defend them against rainbow table attacks. Access Control Lists (ACLs) are an alternative to attaching rules directly to the filesystem in some way. Il faut comprendre dans le sens « Garde ça simple ». This article or section is a candidate for merging with sudo. See su#su and wheel. l’erreur retournée est (je crois me souvenir) la suivante: chroot: /bin/bash unable to find file or directory. See microcode for information on how to install important security updates for your CPU's microcode. The Linux kernel and microcode updates contain mitigations for known vulnerabilities, but disabling SMT may still be required on certain CPUs if untrusted virtualization guests are present. Infos pratiques : où : 32 rue blanche, Paris, métro Liège ou Trinité d'Estienne d'Orves ; quand : Mardi 10 novembre 2015 à 19h. Insecure passwords include those containing: The best choice for a password is something long (the longer, the better) and generated from a random source. Vous pouvez vérifier que votre interface est bien présente : Pour la configuration en statique vous pouvez lancer ces commandes : Pensez également à renseigner le serveur de nom dans le fichier /etc/resolv.conf : Vous avez maintenant un accès au réseau. The master password must be memorized and never saved. Firejail is suggested for browsers and internet facing applications, as well as any servers you may be running. Bruce Schneier has endorsed this technique. Consult your motherboard or system documentation for more information. The theory is that if a sufficiently long phrase is used, the gained entropy from the password's length can counter the lost entropy from the use of dictionary words. Denying root login is also a good practice, both for tracing intrusions and adding an additional layer of security before root access. Dans mon cas c’est le disque « /dev/sda » de 40Go. See also Arch Security Team. As of December 2019, the setup script should NOT be run with superuser permissions. Syslinux supports password-protecting your bootloader. See also SHA password hashes. This technique is more difficult, but can provide confidence that a password will not turn up in wordlists or "intelligent" brute force attacks that combine words and substitute characters. You've reached the website for Arch Linux, a lightweight and flexible Linux® distribution that tries to Keep It Simple. Il faut peut être revoir le terme débutant. An unprotected boot loader can bypass any login restrictions, e.g. This is bothby de… Security; AUR; Download; A simple, lightweight distribution . an encrypted drive or an authenticated remote storage service, or you will not be able to access it in case of need; a useful trick is to protect the drives or accounts where the database is backed up using a simple cryptographic hash of the master password. This is a significant improvement in security compared to the classic permissions. I had it custom printed in China. See Pacman-key for details. Pour ce premier article de 2020 nous allons parler du très connu Arch Linux. If you are using Bash or Zsh, you can set TMOUT for an automatic logout from shells after a timeout. Sinon, rien à redire, c’est propre. security.archlinux.org The Arch kernel is built with CONFIG_BPF_JIT_ALWAYS_ON which disables the BPF interpreter and forces all BPF to use JIT compilation. And I've only ever had whatever lanyard I find from random places! Pour installer archlinux, il vous faut l’image d’installation pour graver un CD ou utiliser une clé usb (le fichier iso à télécharger étant une image hybride, il peut être utilisé indifféremment pour l’un ou l’autre cas). All officially supported kernels initialize the LSM, but none of them enforce any lockdown mode. It is therefore best practice to unmount data partitions as soon as they are no longer needed. Votre adresse e-mail ne sera pas publiée. Even if you do not wish to deny root login for local users, it is always good practice to deny root login via SSH. J ai maitrisé la distribution en 2 jours alors que je ne connaissait rien ( ou trop peu de choses ) Topics: Active | Unanswered; Index » Newbie Corner » arch linux in chromebook linux container - printer configuration; Pages: 1 #1 2021-02-23 09:24:57. emninger Member Registered: 2021-02-03 Posts: 2. arch linux in chromebook linux container - printer configuration. Attacks on package managers are possible without proper use of package signing, and can affect even package managers with proper signature systems. About. J’ai donc installé pas mal de distribution durant l’année écoulée, généralement à grand coup de « Suivant, Suivant, Suivant » comme une grande partie des utilisateurs. Arch Linux; Red Hat; Gentoo; SUSE; GitHub; Lists oss-security; full-disclosure; bugtraq; Misc GitHub code; web search; Severity: Medium: Remote: No: Type: Arbitrary code execution : Description: An issue was discovered in the Linux kernel through 5.10.11. Mozilla publishes an OpenSSH configuration guide which configures more verbose audit logging and restricts ciphers. BlackArch Linux is a lightweight Arch Linux-based distribution targetted at penetration testers, security experts, and security researchers. Personnellement, m’est arrivé de trouver des solutions sur le forum ou le wiki d’Arch alors que mon problème concernait Debian. When one layer is breached, another should stop the attack. To try it out in a standalone manner, use the hardened-malloc-preload wrapper script, or manually start an application with the proper preload value: Proper usage with Firejail can be found on its wiki page, and some configurable build options for hardened_malloc can be found on the github repo. Accueil; Forum; Wiki; Bugs; Paquets; AUR; Télécharger; Planète; Télécharger. Or, individual commands can be allowed for all users. Pas mal , mais je n y suis pas resté très longtemps But if you are using VC mostly for restarting frozen GDM/Xorg as root, then this is very useful. /etc/security/limits.conf determines how many processes each user, or group can have open, and is empty (except for useful comments) by default. It may be possible for a remote attacker to exploit flawed network protocols to access exposed services. Je suis passé ensuite sur Debian , Fedora , ensuite j ai testé des distributions dites grand public The attack surface of a small proxy running with lower privileges is significantly smaller than a complex application running with the end user privileges. Les champs obligatoires sont indiqués avec *. Pour créer une partition il faut utiliser les commandes suivantes : Nous pouvons maintenant formater la partition en ext4 avec la commande : Nous pouvons maintenant passer à l’installation de base de notre machine Arch. Cela permet aux lecteurs d'échanger autour des sujets abordés sur le blog. Je précise une nouvelle fois que dans mon cas il s’agit d’une utilisation en BIOS et non en UEFI. when passing through a security checkpoint). The kernel logs contain useful information for an attacker trying to exploit kernel vulnerabilities, such as sensitive memory addresses. As of pambase 20200721.1-2, pam_faillock.so is enabled by default to lock out users for 10 minutes after 3 failed login attempts in a 15 minute period (see FS#67644). Merci pour la doc, cependant, vous dites que c’est un bon exercice pour un débutant, je ne dirais pas ça, je pense qu’échouer sur ne serait-ce que l’installation de l’os pourrait plus facilement dégoûter le néophyte que l’aider à découvrir cet environnement. See the kernel documentation on hardware vulnerabilities for a list of these vulnerabilities, as well as mitigation selection guides to help customize the kernel to mitigate these vulnerabilities for specific usage scenarios. On systems with many, or untrusted users, it is important to limit the number of processes each can run at once, therefore preventing fork bombs and other denial of service attacks. Add the following line to /etc/pam.d/system-login to add a delay of at least 4 seconds between failed login attempts: 4000000 is the time in microseconds to delay. See Help:Style for reference. When someone attempts to log in with PAM, /etc/security/access.conf is checked for the first combination that matches their login properties. You can also disable SMT in the kernel by adding the following kernel parameters: hardened_malloc (hardened_mallocAUR, hardened-malloc-gitAUR) is a hardened replacement for glibc's malloc(). The root user password need not be given out to each user who requires root access. Tout d’abord ntp pour la synchronisation de l’heure : Puis Xorg qui permet de gérer l’affichage (comme Wayland) ainsi que les paquets pour gérer les périphériques (clavier, souris, trakcpad) : Il faut maintenant installer les drivers de la carte graphique. This can even happen with processes bound to localhost. The tool arch-audit can be used to check for vulnerabilities affecting the running system. Ransomware and other destructive attacks may also attack any connected backup systems. Manual chroot jails can also be constructed. Packages can be rebuilt and stripped of undesired functions and features as a means to reduce attack surface. To check if you are affected by a known vulnerability, run the following: In most cases, updating the kernel and microcode will mitigate vulnerabilities. The module pam_faillock.so can be configured with the file /etc/security/faillock.conf. Well, Linux and Windows are different beasts, that doesn't mean he won't gey hacked again, but I do think he'll be less of a target on a Linux platform. Toggle navigation. Personally identifiable information (e.g., your dog's name, date of birth, area code, favorite video game). Nous allons maintenant voir comment installer Arch Linux (et vous allez voir rien à voir avec Debian ou Ubuntu) avec l’environnement graphique KDE. Nous pouvons maintenant passer à l’installation de quelques outils comme Gimp ou encore LibreOffice : Il faut maintenant créer votre utilisateur et lui ajouter un mot de passe : Et pour terminer il faut dé-commenter la ligne suivante dans le fichier /etc/sudoers : Nous pouvons maintenant passer à l’installation de l’interface KDE. It is therefore important to restrict usage of the root user account as much as possible. Je suis passé il y a 15 jours sur Fedora. Arch Linux. See GRUB/Tips and tricks#Password protection of GRUB menu for details. Certain programs, like dm-crypt, allow the user to encrypt a loop file as a virtual volume. Custom hardening flags can also be applied either manually or via a wrapper. This article or section needs language, wiki syntax or style improvements. While this system is arguably more flexible in its security offerings than pathname-based MAC, it only works on filesystems that support these extended attributes. This parameter is set to 1 (restricted) by default which prevents tracers from performing a ptrace call on tracees outside of a restricted scope unless the tracer is privileged or has the CAP_SYS_PTRACE capability. Individual programs may be enabled per user, instead of offering complete root access just to run one command. While hardened_malloc is not yet integrated into glibc (assistance and pull requests welcome) it can be used easily with LD_PRELOAD. Argh, ça m’apprendra à vouloir faire vite, encore merci ! See Xorg#Rootless Xorg for more details how to run it without root privileges. While the stock Arch kernel is capable of using Netfilter's iptables and nftables, they are not enabled by default. If Arch is a first Linux distro for you both, then there may still be ways for a hacker to get in because as far as I understand the base installation has no firewall. For example, bzip2 can be rebuilt without bzip2recover in an attempt to circumvent CVE-2016-3189. Passwords must be complex enough to not be easily guessed from e.g. Install USBGuard, which is a software framework that helps to protect your computer against rogue USB devices (a.k.a. (Skunnyk) Ansible 101 (Julien Girardin) Arch Linux Archive / agetpkg (Sebastien Luttringer) Le Meetup est hébergé par BlaBlaCar. BadUSB, PoisonTap or LanTurtle) by implementing basic whitelisting and blacklisting capabilities based on device attributes. Some services listen for inbound traffic on open network ports. Nous voici maintenant avec un shell et l’utilisateur « root ». You should make sure your drive is first in the boot order and disable the other drives from being bootable if you can. By default, the lock mechanism is a file per-user located at /run/faillock/. [6][dead link 2020-04-03 ⓘ] There is little you can do from preventing this, or modification of the hardware itself - such as flashing malicious firmware onto a drive. Passwords are key to a secure Linux system. You may also encrypt a drive with the key stored in a TPM, although it has had vulnerabilites in the past and the key can be extracted by a bus sniffing attack. Use sudo as necessary for temporary privileged access. Pour cela il faut d’abord l’identifier avec la commande suivante : Dans mon cas il s’agit d’une carte VMWare : Généralement il s’agit d’Intel, AMD ou Nvidia. vulnerable; all; Group Issue Package Affected Fixed Severity Status Ticket Advisory; AVG-1239: CVE-2021-20201 CVE-2020-14355: spice: 0.14.3-3: Critical: Vulnerable: FS#68166 : AVG-1634: CVE-2021-21190 CVE-2021-21189 CVE-2021-21188 CVE-2021-21187 CVE-2021-21186 CVE … Arch Linux est une distribution légère et rapide dont le concept est de rester la plus simple possible (philosophie KISS). This website is estimated worth of $ 1,182,240.00 and have a daily income of around $ 1,642.00. It is highly recommended to set up some form of firewall to protect the services running on the system. Garuda Linux is a userfriendly and performance orientated distro which is based on Arch Linux.Unlike Arch, the installation process is easy and management easy because of many included advanced GUI tools to manage the system.Garuda Linux provides system security by using automatic BTRFS snapshots when upgrading which you can boot into if an upgrade fails. The root user is, by definition, the most powerful user on a system. They publish ASAs (Arch Linux Security Advisory) which is an Arch-specific warning disseminated to Arch users. Le site Net-Security dispose d'une instance Mattermost ouverte à tous ! visudo fait qqes checks syntaxiques avant sauvegarde permettant ainsi d’éviter certaines catastrophes. Catégories : Cryptographie GNU/Linux Système. Another effective technique can be to write randomly generated passwords down and store them in a safe place, such as in a wallet, purse or document safe. However, password crackers have caught on to this trick and will generate wordlists containing billions of permutations and variants of dictionary words, reducing the effective entropy of the password. Another aspect of the strength of the passphrase is that it must not be easily recoverable from other places. Excellent article et bon choix de distro ! Linux Containers are another good option when you need more separation than the other options (short of KVM and VirtualBox) provide. seccomp). Si ça vous intéresse, la documentation d’Arch Linux en présente plusieurs sur ce lien. For example: If you use an out-of-tree driver such as NVIDIA, you may need to switch to its DKMS package. It was a little expensive, but I figured, I've had a job that needed a lanyard for over 12 years now, and I wear it 5 days a week, 8 hours a day. TIPS : Vous pouvez supprimer des lignes dans nano avec les touches CTRL + k. Nous pouvons maintenant passer à l’installation de base d’Arch : Vous pouvez également installer plusieurs utilitaires qui seront pratiques pour la suite : Après l’installation des outils de base, il faut générer le fichier fstab pour la gestion des partitions : Nous pouvons maintenant passer à la configuration de l’OS, pour cela il faut se rendre dans ce dernier avec la commande suivante : Pour la configuration de la zone géographique : Au niveau des locale, il faut dé-commenter « fr_FR.UTF-8 UTF-8 » dans le fichier /etc/locale.gen et lancer la commande : Il faut ensuite créer le fichier « /etc/locale.conf » et configurer la variable LANG : Même principe pour la gestion du clavier avec le fichier « /etc/vconsole.conf » : Nous devons maintenant configurer le nom d’hôte de la machine dans les fichiers « /etc/hostname » & « /etc/hosts » : Il faut maintenant ajouter un mot de passe à l’utilisateur root : Et pour finir, installer un bootloader, dans mon cas ça sera Grub2 : Le paquet os-prober est indispensable dans le cas d’un dual-boot. The PAM pam_wheel.so lets you allow only users in the group wheel to login using su. Regularly test the integrity of the backups. This method can also be merged with encrypting /boot. Done the Arch Way and optimized for i686, x86_64, ARMv6, ARMv7, and ARMv8. Take for instance “the girl is walking down the rainy street” could be translated to t6!WdtR5 or, less simply, t&6!RrlW@dtR,57. Proponents of this idea often use full-disk encryption alongside, and some also use detached encryption headers placed on the boot partition. A CVE is public, it is identified by a unique ID of the form CVE-YYYY-number. Est-ce que vous pouvez m’envoyer une capture d’écran pour que je puisse vous aider ? It is also useful for advanced network security, performance profiling and dynamic tracing. What are the specs for the VM (how much ram, hard drive space, etc.) Finding servers requiring security updates. The paxtest command can be used to obtain an estimate of the provided entropy: This section is being considered for removal. Les noms des drivers à installer sont disponibles ici. An Arch Linux repository for security professionals and enthusiasts. D’autres OS utilisent ce système comme Gentoo par exemple. J en ai installé d autres … Pour la configuration il faut lancer les commandes suivantes : Après cette commande vous entrez de l’invit de commande de l’outil fdisk. Nous verrons également comment réaliser les actions de base comme installer un paquet, faire des mises à jour, etc. Deleting or emptying the file unlocks that user - the directory is owned by root, but the file is owned by the user, so the faillock command only empties the file, therefore does not require root. For example the DNS resolver is implemented in glibc, that is linked with the application (that may be running as root), so a bug in the DNS resolver might lead to a remote code execution. Pour lister les partitions vous pouvez utiliser « p ». This may help with determining appropriate values for the limits. LXC is run on top of the existing kernel in a pseudo-chroot with their own virtual hardware.