Just a small finger exercise …
Artikel in Kategorie "GNU/Linux"
Bourne to Bourne Again Shell Forward Compatibility
30. November 2021 in GNU/Linux, Programmierung.
Introduction In this article i try to find out, if Bourne Shell scripts are runnable in Bourne Again Shell without modification. If not, i advice on how to modify the code so that it runs on both Shells. An interpreter for some variant of Bourne Shell is available as an executable /bin/sh on most Linux […]
Comparing Distinguished LDAP Names
6. August 2020 in Administration, GNU/Linux, Programmierung.
In a Bourne Shell script, a distinguished name (DN) for performing an LDAP-query is held in a variable: dn=“cn=Malmø,ou=County Capitals,dc=Sweden,dc=Europe“ For the purpose of demonstration, this example DN contains a non-ASCII character. Let’s write a Bourne Shell function that escapes such special characters as requested by RFC 4514 using perl’s Net::LDAP::Util: canonical_dn() { perl -s […]
So it is possible …
28. August 2021 in Administration, Gesellschaft, GNU/Linux, Technik.
Update August 28th 2021: I have identified some TLDs that apparently can be used for testing purposes. I have updated the text as indicated. … to have DNS top level domains for bargains (.bargain), the bible (.bible), black friday (.blackfriday) and marketing and social networking (.buzz), but it is not possible to have a TLD […]
Determining User Access on a Linux Filesystem with „Classic Permissions“
30. November 2021 in Administration, GNU/Linux.
Introduction Looking at a Linux filesystem, checking if a certain file or directory is accessible for reading, writing or executing by certain users or groups poses interesting challenges. Let the basic and seemingly simple question be: „Given a user X and a file Y, can it be determined if X has access to Y, and […]
The Backport of Bugfix #4864 to Squid Version 4
8. März 2020 in GNU/Linux.
With SSL-bumping enabled, with an unpatched version of Squid, the service can crash with this errormessage: !Comm::MonitorsRead assertion in HttpStateData::maybeReadVirginBody() This bug is fixed in Squid version 5, which was a sponsored effort by the developers of Squid. There is an effort of getting a bugfix into v4, which can be followed here. There also […]
Taking an Online Backup of a SAMBA-4 ActiveDirectory
7. Dezember 2019 in Administration, GNU/Linux.
Notes: The following procedure is available starting with SAMBA version 4.9. The procedure can be performed on a host that is unrelated to the domain, but one domain controller must be reachable, must be used as a nameserver at the time of the backup and have open ports for DNS (53/tcp and /udp) SSH (22/tcp), […]
Re-Enable TLS 1.0 for OpenSSL-based Clients on Debian Buster
8. März 2020 in GNU/Linux.
OpenSSL shipped with Debian 10 „Buster“ disables TLS protocol versions below 1.2. The web-browsers Chromium and Firefox ship with an embedded SSL implementation and are not affected (they will issue warnings about legacy websites), but it can cause problems with curl, Squid and other clients that are linked against the OpenSSL. To re-enable TLS version […]