completes nis
This commit is contained in:
waldek
parent
7aa246b080
commit
69a2c25745
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@ -245,3 +245,504 @@ It gives modern setup instructions for an old service.
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#### The server
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#### The server
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There is a *meta package* available called `nis` which installs all necessary components for both the server **and** the client.
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We'll do the server first.
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The configuration changed drastically between Debian 10 and 11 but the fundamentals still apply.
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```bash
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➜ ~ sudo apt install nis
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Reading package lists... Done
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Building dependency tree... Done
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Reading state information... Done
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nis is already the newest version (4.4).
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0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
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➜ ~
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```
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Now NIS is installed but we need to configure it to offer the local accounts onto the LAN.
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The installation added a few interesting configuration files to you server.
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The following four files determine *how* your server **and/or** client behave.
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```bash
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➜ ~ ls /etc/default/nis
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/etc/default/nis
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➜ ~ ls /etc/yp*
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/etc/yp.conf /etc/ypserv.conf /etc/ypserv.securenets
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➜ ~
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```
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One file that is not added but essential for NIS to function is `/etc/defaultdomain`.
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Each server exposes a **domain** onto the network and its name has to be defined in the latter file.
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The domain can be anything you like but most administrators would make it the same as the hostname of the server.
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I'll set it differently just for demonstration purposes.
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```bash
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➜ ~ ls -l /etc/defaultdomain
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-rw-r--r-- 1 root root 12 Sep 27 11:18 /etc/defaultdomain
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➜ ~ cat /etc/defaultdomain
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waldekworld
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➜ ~
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```
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Clients work in *broadcast* by default.
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The documentation suggests to change the `/etc/default/rpcbind` file to accommodate this.
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The change is the `-r` argument to the `OPTIONS="-w"` line.
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What does this argument do?
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A quick `man rpcbind` offers the following explanation.
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```bash
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-r Turn on remote calls. Cause rpcbind to open up random listening ports. Note that rpcinfo need this feature turned on
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for work properly. (This flag is a Debian extension.)
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```
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```bash
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➜ ~ cat /etc/default/rpcbind
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# /etc/init.d/rpcbind
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OPTIONS=""
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# Cause rpcbind to do a "warm start" utilizing a state file (default)
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OPTIONS="-w -r"
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# Uncomment the following line to restrict rpcbind to localhost only for UDP requests
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# OPTIONS="${OPTIONS} -h 127.0.0.1 -h ::1"
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# Uncomment the following line to enable libwrap TCP-Wrapper connection logging
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# OPTIONS="${OPTIONS} -l "
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➜ ~
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```
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Now that the domain is defined we can enable and start the services related to NIS.
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```bash
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➜ ~ sudo /usr/lib/yp/ypinit -m
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At this point, we have to construct a list of the hosts which will run NIS
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servers. debiannis.lan is in the list of NIS server hosts. Please continue to add
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the names for the other hosts, one per line. When you are done with the
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list, type a <control D>.
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next host to add: debiannis.lan
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next host to add:
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The current list of NIS servers looks like this:
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debiannis.lan
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Is this correct? [y/n: y] y
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We need a few minutes to build the databases...
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Building /var/yp/waldekworld/ypservers...
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Running /var/yp/Makefile...
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gmake[1]: Entering directory '/var/yp/waldekworld'
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Updating passwd.byname...
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Updating passwd.byuid...
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Updating group.byname...
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Updating group.bygid...
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Updating hosts.byname...
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Updating hosts.byaddr...
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Updating rpc.byname...
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Updating rpc.bynumber...
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Updating services.byname...
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Updating services.byservicename...
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Updating netid.byname...
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Updating protocols.bynumber...
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Updating protocols.byname...
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Updating netgroup...
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Updating netgroup.byhost...
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Updating netgroup.byuser...
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Updating shadow.byname...
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gmake[1]: Leaving directory '/var/yp/waldekworld'
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debiannis.lan has been set up as a NIS master server.
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Now you can run ypinit -s debiannis.lan on all slave server.
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➜ ~
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```
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#### The first client
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On the clients we'll have to install the same `nis` package as we did on the server.
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We'll also have to define the `/etc/defaultdomain` the same way we did on the server.
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```bash
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➜ ~ sudo apt install nis
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Reading package lists... Done
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Building dependency tree... Done
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Reading state information... Done
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nis is already the newest version (4.4).
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0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
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➜ ~ cat /etc/defaultdomain
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waldekworld
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➜ ~
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```
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To start the client service we need to enable and start `ypbind.service`.
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But by default it **will** give errors!
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```bash
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➜ ~ sudo systemctl start ypbind.service
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Job for ypbind.service failed because the control process exited with error code.
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See "systemctl status ypbind.service" and "journalctl -xe" for details.
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➜ ~ sudo journalctl -e --unit ypbind.service --no-pager
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-- Journal begins at Mon 2021-09-27 13:40:56 CEST, ends at Mon 2021-09-27 13:52:10 CEST. --
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Sep 27 13:48:12 debianclient1 systemd[1]: Starting NIS Binding Service...
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Sep 27 13:48:12 debianclient1 ypbind[3494]: No NIS server and no -broadcast option specified.
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Sep 27 13:48:12 debianclient1 ypbind[3494]: Add a NIS server to the /etc/yp.conf configuration file,
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Sep 27 13:48:12 debianclient1 ypbind[3494]: or start ypbind with the -broadcast option.
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Sep 27 13:48:12 debianclient1 systemd[1]: ypbind.service: Control process exited, code=exited, status=1/FAILURE
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Sep 27 13:48:12 debianclient1 systemd[1]: ypbind.service: Failed with result 'exit-code'.
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Sep 27 13:48:12 debianclient1 systemd[1]: Failed to start NIS Binding Service.
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➜ ~
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```
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We can solve the problem in two ways:
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1. add our NIS server address to the client's `/etc/yp.conf` file
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2. let the client *broadcast* it's requests.
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I'll opt for the latter because I find it easier.
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This configuration is done in the `/etc/default/nis` file.
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The argument needed is the `-broadcast` to `YPBINDARGS`
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```bash
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➜ ~ cat /etc/default/nis
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#
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# /etc/defaults/nis Optional configuration settings for the NIS programs.
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#
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#
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# The following two variables are still used in the init script, but
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# ignored by systemd. See `nis.debian.howto` in the documentation
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# directory for more information.
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#
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# Are we a NIS server and if so what kind (values: false, slave, master)?
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NISSERVER=false
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# Are we a NIS client?
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NISCLIENT=false
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# Location of the master NIS password file (for yppasswdd).
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# If you change this make sure it matches with /var/yp/Makefile.
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YPPWDDIR=/etc
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# Do we allow the user to use ypchsh and/or ypchfn ? The YPCHANGEOK
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# fields are passed with -e to yppasswdd, see it's manpage.
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# Possible values: "chsh", "chfn", "chsh,chfn"
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YPCHANGEOK=chsh
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# NIS master server. If this is configured on a slave server then ypinit
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# will be run each time NIS is started.
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NISMASTER=
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# Additional options to be given to ypserv when it is started.
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YPSERVARGS=
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# Additional options to be given to ypbind when it is started.
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YPBINDARGS="-broadcast"
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# Additional options to be given to yppasswdd when it is started. Note
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# that if -p is set then the YPPWDDIR above should be empty.
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YPPASSWDDARGS=
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# Additional options to be given to ypxfrd when it is started.
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YPXFRDARGS=
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➜ ~
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```
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When we restart `ypbind.service` now we won't get any errors!
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```bash
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➜ ~ sudo systemctl start ypbind.service
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➜ ~
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```
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Last thing to do is to *initialize* the client.
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This is done by running the `ypinit` program.
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By default it's not in your `PATH` but you can specifically call it as follows.
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```bash
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➜ ~ sudo /usr/lib/yp/ypinit -s debiannis.lan
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We will need a few minutes to copy the data from debiannis.lan.
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Transferring group.bygid...
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Trying ypxfrd ... success
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Transferring protocols.byname...
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Trying ypxfrd ... success
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Transferring ypservers...
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Trying ypxfrd ... success
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Transferring rpc.byname...
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Trying ypxfrd ... success
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Transferring passwd.byname...
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Trying ypxfrd ... success
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Transferring hosts.byname...
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Trying ypxfrd ... success
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Transferring netgroup.byuser...
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Trying ypxfrd ... success
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Transferring protocols.bynumber...
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Trying ypxfrd ... success
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Transferring hosts.byaddr...
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Trying ypxfrd ... success
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Transferring passwd.byuid...
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Trying ypxfrd ... success
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Transferring services.byname...
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Trying ypxfrd ... success
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Transferring shadow.byname...
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Trying ypxfrd ... success
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Transferring netid.byname...
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Trying ypxfrd ... success
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Transferring group.byname...
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Trying ypxfrd ... success
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Transferring services.byservicename...
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Trying ypxfrd ... success
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Transferring netgroup...
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Trying ypxfrd ... success
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Transferring netgroup.byhost...
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Trying ypxfrd ... success
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Transferring rpc.bynumber...
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Trying ypxfrd ... success
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debianclient1's NIS data base has been set up.
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If there were warnings, please figure out what went wrong, and fix it.
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At this point, make sure that /etc/passwd and /etc/group have
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been edited so that when the NIS is activated, the data bases you
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have just created will be used, instead of the /etc ASCII files.
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➜ ~
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```
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##### Querying the server
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A couple of additional programs got installed when installing the `nis` package.
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Try a `yp` plus tab complete in your shell to get a list of them.
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```bash
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~ yp
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ypcat ypchfn ypchsh ypdomainname ypmatch yppasswd ypwhich
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```
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`ypwhich` can be used to see *which* ypserver your client is connected to.
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You can also list you domain and get a peak look at the available accounts on the server.
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```bash
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➜ ~ ypwhich
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192.168.0.185
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➜ ~ ypdomainname
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waldekworld
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➜ ~ ypcat passwd
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bob:x:1001:1001:,,,:/home/bob:/bin/bash
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alice:x:1002:1002:,,,:/home/alice:/bin/bash
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nobody:x:65534:65534:nobody:/nonexistent:/usr/sbin/nologin
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waldek:x:1000:1000:waldek,,,:/home/waldek:/usr/bin/zsh
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➜ ~
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```
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#### Adding more accounts on the server
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I'll add two new accounts on the server to test whether we can actually log in on the client machine.
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```bash
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➜ ~ sudo adduser bert
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adduser: The user `bert' already exists.
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➜ ~ sudo adduser naomi
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adduser: The user `naomi' already exists.
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➜ ~
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```
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Let's see how this reflects on the client.
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```bash
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➜ ~ ypcat passwd
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bob:x:1001:1001:,,,:/home/bob:/bin/bash
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alice:x:1002:1002:,,,:/home/alice:/bin/bash
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nobody:x:65534:65534:nobody:/nonexistent:/usr/sbin/nologin
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waldek:x:1000:1000:waldek,,,:/home/waldek:/usr/bin/zsh
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➜ ~
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```
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The accounts don't seem to be available?
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This is because when you make changes on the server you need to update the database on that end.
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```bash
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➜ ~ sudo /usr/lib/yp/ypinit -m
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At this point, we have to construct a list of the hosts which will run NIS
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servers. debiannis.lan is in the list of NIS server hosts. Please continue to add
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the names for the other hosts, one per line. When you are done with the
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list, type a <control D>.
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next host to add: debiannis.lan
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next host to add:
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The current list of NIS servers looks like this:
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debiannis.lan
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Is this correct? [y/n: y] t
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We need a few minutes to build the databases...
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Building /var/yp/waldekworld/ypservers...
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Running /var/yp/Makefile...
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gmake[1]: Entering directory '/var/yp/waldekworld'
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Updating passwd.byname...
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Updating passwd.byuid...
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Updating group.byname...
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Updating group.bygid...
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Updating hosts.byname...
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Updating hosts.byaddr...
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Updating rpc.byname...
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Updating rpc.bynumber...
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Updating services.byname...
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Updating services.byservicename...
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Updating netid.byname...
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Updating protocols.bynumber...
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Updating protocols.byname...
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Updating netgroup...
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Updating netgroup.byhost...
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Updating netgroup.byuser...
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Updating shadow.byname...
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gmake[1]: Leaving directory '/var/yp/waldekworld'
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debiannis.lan has been set up as a NIS master server.
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Now you can run ypinit -s debiannis.lan on all slave server.
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➜ ~
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```
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On the client you **don't** have to do **anything**!
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```bash
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➜ ~ ypcat passwd
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bob:x:1001:1001:,,,:/home/bob:/bin/bash
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alice:x:1002:1002:,,,:/home/alice:/bin/bash
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||||||
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naomi:x:1004:1004:,,,:/home/naomi:/bin/bash
|
||||||
|
bert:x:1003:1003:,,,:/home/bert:/bin/bash
|
||||||
|
nobody:x:65534:65534:nobody:/nonexistent:/usr/sbin/nologin
|
||||||
|
waldek:x:1000:1000:waldek,,,:/home/waldek:/usr/bin/zsh
|
||||||
|
➜ ~
|
||||||
|
```
|
||||||
|
|
||||||
|
Both accounts are now available on the client!
|
||||||
|
Let's try switching to the `bert` or `naomi` account.
|
||||||
|
|
||||||
|
```bash
|
||||||
|
➜ ~ su bert
|
||||||
|
su: user bert does not exist or the user entry does not contain all the required fields
|
||||||
|
➜ ~
|
||||||
|
```
|
||||||
|
|
||||||
|
This does not seem to work!
|
||||||
|
Everything is set in place to communicate with the `nis` server **but** the client machine has not been configured to **use** NIS as a valid authentication mechanism.
|
||||||
|
This is why we're looking at this first centralized authentication process because every other system, such as LDAP, also need to play by these rules.
|
||||||
|
|
||||||
|
#### Setting up the client for authentication
|
||||||
|
|
||||||
|
On each Linux system you'll find a `/etc/nsswitch.conf` file.
|
||||||
|
Let's have a look at it on our client.
|
||||||
|
|
||||||
|
```bash
|
||||||
|
➜ ~ cat /etc/nsswitch.conf
|
||||||
|
# /etc/nsswitch.conf
|
||||||
|
#
|
||||||
|
# Example configuration of GNU Name Service Switch functionality.
|
||||||
|
# If you have the `glibc-doc-reference' and `info' packages installed, try:
|
||||||
|
# `info libc "Name Service Switch"' for information about this file.
|
||||||
|
|
||||||
|
passwd: files systemd
|
||||||
|
group: files systemd
|
||||||
|
shadow: files
|
||||||
|
gshadow: files
|
||||||
|
|
||||||
|
hosts: files dns
|
||||||
|
networks: files
|
||||||
|
|
||||||
|
protocols: db files
|
||||||
|
services: db files
|
||||||
|
ethers: db files
|
||||||
|
rpc: db files
|
||||||
|
|
||||||
|
netgroup: nis
|
||||||
|
➜ ~
|
||||||
|
```
|
||||||
|
|
||||||
|
This file describes where and how different services get there information from.
|
||||||
|
I highly advise you to have a read of the `man nsswitch.conf` pages because it's a lot more flexible than you think.
|
||||||
|
We can now either append `nis` to the necessary lines, or fully replace them.
|
||||||
|
The necessary lines are the passwd, group and shadow lines.
|
||||||
|
|
||||||
|
```bash
|
||||||
|
➜ ~ cat /etc/nsswitch.conf
|
||||||
|
# /etc/nsswitch.conf
|
||||||
|
#
|
||||||
|
# Example configuration of GNU Name Service Switch functionality.
|
||||||
|
# If you have the `glibc-doc-reference' and `info' packages installed, try:
|
||||||
|
# `info libc "Name Service Switch"' for information about this file.
|
||||||
|
|
||||||
|
passwd: files systemd nis
|
||||||
|
group: files systemd nis
|
||||||
|
shadow: files nis
|
||||||
|
gshadow: files
|
||||||
|
|
||||||
|
hosts: files dns
|
||||||
|
networks: files
|
||||||
|
|
||||||
|
protocols: db files
|
||||||
|
services: db files
|
||||||
|
ethers: db files
|
||||||
|
rpc: db files
|
||||||
|
|
||||||
|
netgroup: nis
|
||||||
|
➜ ~
|
||||||
|
```
|
||||||
|
|
||||||
|
The last thing to do is to add a special entry in the local (on each client) passwd, group and shadow files to make *room* for accounts coming from the NIS server.
|
||||||
|
|
||||||
|
```bash
|
||||||
|
➜ ~ sudo tail -n 2 /etc/passwd /etc/shadow /etc/group
|
||||||
|
==> /etc/passwd <==
|
||||||
|
+::::::
|
||||||
|
|
||||||
|
|
||||||
|
==> /etc/shadow <==
|
||||||
|
+::::::::
|
||||||
|
|
||||||
|
|
||||||
|
==> /etc/group <==
|
||||||
|
+:::
|
||||||
|
|
||||||
|
➜ ~
|
||||||
|
```
|
||||||
|
|
||||||
|
With this set and done we can use one centralized service to manage all of our account.
|
||||||
|
|
||||||
|
### Some tips
|
||||||
|
|
||||||
|
In short, to add a second client you need to:
|
||||||
|
|
||||||
|
1. install `nis`
|
||||||
|
2. configure the `ypbind.service` to `-broadcast`
|
||||||
|
3. enable and start the `ypbind.service`
|
||||||
|
* test the connection with `ypwhich`
|
||||||
|
4. add `nis` to the `/etc/nsswitch.conf` file as an authentication method
|
||||||
|
5. add *placeholder* lines for external accounts
|
||||||
|
* in the `/etc/passwd` file
|
||||||
|
* in the `/etc/shadow` file
|
||||||
|
* in the `/etc/group` file
|
||||||
|
|
||||||
|
If the account changes made on the server aren't reflected onto the clients, make sure your database is up to date.
|
||||||
|
If it is and the client still doesn't behave like it should, have a look at the `man nscd` pages.
|
||||||
|
Once you understand what it is, maybe try restarting it, or even disabling it all together.
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
|
||||||
Loading…
Reference in New Issue