How To Install nss_wrapper on Fedora 34

nss_wrapper is A wrapper for the user, group and hosts NSS API A wrapper for the user, group and hosts NSS API

Introduction

In this tutorial we learn how to install nss_wrapper on Fedora 34.

What is `nss_wrapper`

There are projects which provide daemons needing to be able to create, modify and delete Unix users. Or just switch user ids to interact with the system e.g. a user space file server. To be able to test that you need the privilege to modify the passwd and groups file. With nss_wrapper it is possible to define your own passwd and groups file which will be used by software to act correctly while under test. If you have a client and server under test they normally use functions to resolve network names to addresses (dns) or vice versa. The nss_wrappers allow you to create a hosts file to setup name resolution for the addresses you use with socket_wrapper. To use it set the following environment variables LD_PRELOAD=libuid_wrapper.so NSS_WRAPPER_PASSWD=/path/to/passwd NSS_WRAPPER_GROUP=/path/to/group NSS_WRAPPER_HOSTS=/path/to/host This package doesn’t have a devel package cause this project is for development/testing. nss_wrapper 1.1.11 5.fc34 x86_64 45 k nss_wrapper-1.1.11-5.fc34.src.rpm fedora A wrapper for the user, group and hosts NSS API https BSD There are projects which provide daemons needing to be able to create, modify and delete Unix users. Or just switch user ids to interact with the system e.g. a user space file server. To be able to test that you need the privilege to modify the passwd and groups file. With nss_wrapper it is possible to define your own passwd and groups file which will be used by software to act correctly while under test. If you have a client and server under test they normally use functions to resolve network names to addresses (dns) or vice versa. The nss_wrappers allow you to create a hosts file to setup name resolution for the addresses you use with socket_wrapper. To use it set the following environment variables LD_PRELOAD=libuid_wrapper.so NSS_WRAPPER_PASSWD=/path/to/passwd NSS_WRAPPER_GROUP=/path/to/group NSS_WRAPPER_HOSTS=/path/to/host This package doesn’t have a devel package cause this project is for development/testing.

We can use yum or dnf to install nss_wrapper on Fedora 34. In this tutorial we discuss both methods but you only need to choose one of method to install nss_wrapper.

Install nss_wrapper on Fedora 34 Using dnf

Update yum database with dnf using the following command.

sudo dnf makecache --refresh

The output should look something like this:

Fedora 34 - x86_64                               20 kB/s | 6.6 kB     00:00
Fedora 34 openh264 (From Cisco) - x86_64        1.4 kB/s | 989  B     00:00
Fedora Modular 34 - x86_64                       68 kB/s | 6.5 kB     00:00
Fedora 34 - x86_64 - Updates                    3.5 kB/s | 6.2 kB     00:01
Fedora Modular 34 - x86_64 - Updates             17 kB/s | 5.9 kB     00:00
Metadata cache created.

After updating yum database, We can install nss_wrapper using dnf by running the following command:

sudo dnf -y install nss_wrapper

Install nss_wrapper on Fedora 34 Using yum

Update yum database with yum using the following command.

sudo yum makecache --refresh

The output should look something like this:

Fedora 34 - x86_64                               20 kB/s | 6.6 kB     00:00
Fedora 34 openh264 (From Cisco) - x86_64        1.4 kB/s | 989  B     00:00
Fedora Modular 34 - x86_64                       68 kB/s | 6.5 kB     00:00
Fedora 34 - x86_64 - Updates                    3.5 kB/s | 6.2 kB     00:01
Fedora Modular 34 - x86_64 - Updates             17 kB/s | 5.9 kB     00:00
Metadata cache created.

After updating yum database, We can install nss_wrapper using yum by running the following command:

sudo yum -y install nss_wrapper

How To Uninstall nss_wrapper on Fedora 34

To uninstall only the nss_wrapper package we can use the following command:

sudo dnf remove nss_wrapper

nss_wrapper Package Contents on Fedora 34

/usr/bin/nss_wrapper.pl
/usr/lib/.build-id
/usr/lib/.build-id/85
/usr/lib/.build-id/85/a712bde09babfc0fa6f2a7e6380224bf4b41ca
/usr/lib64/cmake/nss_wrapper
/usr/lib64/cmake/nss_wrapper/nss_wrapper-config-version.cmake
/usr/lib64/cmake/nss_wrapper/nss_wrapper-config.cmake
/usr/lib64/libnss_wrapper.so
/usr/lib64/libnss_wrapper.so.0
/usr/lib64/libnss_wrapper.so.0.3.1
/usr/lib64/pkgconfig/nss_wrapper.pc
/usr/share/doc/nss_wrapper
/usr/share/doc/nss_wrapper/AUTHORS
/usr/share/doc/nss_wrapper/CHANGELOG
/usr/share/doc/nss_wrapper/README.md
/usr/share/licenses/nss_wrapper
/usr/share/licenses/nss_wrapper/LICENSE
/usr/share/man/man1/nss_wrapper.1.gz
/usr/bin/nss_wrapper.pl
/usr/lib/.build-id
/usr/lib/.build-id/bc
/usr/lib/.build-id/bc/a5fff49578c4cdde125205da177e12cc5bcd55
/usr/lib/cmake/nss_wrapper
/usr/lib/cmake/nss_wrapper/nss_wrapper-config-version.cmake
/usr/lib/cmake/nss_wrapper/nss_wrapper-config.cmake
/usr/lib/libnss_wrapper.so
/usr/lib/libnss_wrapper.so.0
/usr/lib/libnss_wrapper.so.0.3.1
/usr/lib/pkgconfig/nss_wrapper.pc
/usr/share/doc/nss_wrapper
/usr/share/doc/nss_wrapper/AUTHORS
/usr/share/doc/nss_wrapper/CHANGELOG
/usr/share/doc/nss_wrapper/README.md
/usr/share/licenses/nss_wrapper
/usr/share/licenses/nss_wrapper/LICENSE
/usr/share/man/man1/nss_wrapper.1.gz

References

[nss_wrapper website](https://cwrap.org/ https://cwrap.org/)

Summary

In this tutorial we learn how to install nss_wrapper on Fedora 34 using yum and dnf.