Linux

47997 readers

1192 users here now

From Wikipedia, the free encyclopedia

Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

Rules

Posts must be relevant to operating systems running the Linux kernel. GNU/Linux or otherwise.
No misinformation
No NSFW content
No hate speech, bigotry, etc

Related Communities

Community icon by Alpár-Etele Méder, licensed under CC BY 3.0

founded 5 years ago

MODERATORS

[email protected]

[HELP NEEDED] Unable to figure out directory permissions (infosec.pub)

submitted 3 months ago by [email protected] to c/[email protected]

8 comments fedilink hide all child comments

Hi everyone,

This is my CONTAINERFILE for Bind9:

FROM debian

ENV LC_ALL C.UTF-8

# Update and upgrade system
RUN apt-get update -y && apt-get upgrade -y && apt-get dist-upgrade -y

# Install BIND 9 and sudo (for debugging if needed)
RUN apt-get install -y bind9 bind9-dnsutils bind9-libs bind9-utils sudo

# Configure permissions for BIND directories
RUN mkdir -p /var/cache/bind /var/lib/bind /var/log/bind
RUN chown -R bind:bind /var/cache/bind /var/lib/bind /var/log/bind
RUN chmod 664 /var/cache/bind /var/lib/bind /var/log/bind
RUN chmod -R 664 /var/cache/bind /var/lib/bind /var/log/bind

# Create and configure log files
RUN touch /var/log/bind/default.log /var/log/bind/update_debug.log /var/log/bind/security_info.log /var/log/bind/bind.log
RUN chown -R bind:bind /var/log/bind
RUN chmod 644 /var/log/bind/*.log

# Define volumes
VOLUME ["/etc/bind", "/var/cache/bind", "/var/lib/bind", "/var/log/bind"]

# Set the entrypoint to the named executable
ENTRYPOINT ["/usr/sbin/named"]

# Set the default command arguments for the named executable
CMD ["-g"]

I keep getting this error when I run it with podman:

26-Jul-2024 03:18:21.328 loading configuration from '/etc/bind/named.conf'
26-Jul-2024 03:18:21.328 directory '/var/cache/bind' is not writable
26-Jul-2024 03:18:21.332 /etc/bind/named.conf.options:2: parsing failed: permission denied

As you can see from the CONTAINERFILE, the bind user should be able to read and write to /var/cache/bind but for some reason it doesn't.

I have been at this for a while and I'm at my wits end. Your help is appreciated!

you are viewing a single comment's thread
view the rest of the comments

[–] [email protected] 3 points 3 months ago* (last edited 3 months ago) (1 children)

Hey just a heads up, the permissions you needed weren’t “7”, but “+x”. +x is execute permissions. “+x” is a user or groups ability to execute the file or (browse the) directory. The number is an expression of some user or groups ability to read, write and execute all in one convient character. It’s calculated by adding together the numerical values of read, write and execute permissions when read is 4, write is 2 and execute is 1.

So with all of them enabled you’d add up all three numbers and come up with 7, full permissions. R+x is 5 and r+w is 6 etc. there are eight different possibilities.

The reason it’s done that way is from long ago, before acls, when data about files had to be stored in simple ways on tiny file systems. The permissions for a file were half a byte, and stored not as “0-7” but as three bits. If the first one was a “1” you could read, if the second one was the same you could write and so on.

e: the whole point of saying this post was that knowing all i just wrote, a person can decypher old and new discussions on their problems that use language like "the execute bit" or "set the read bit".

[–] [email protected] 1 points 3 months ago

Thanks, since the user would need to read write and execute permissions to the directory, I put in chmod 775