Category: System Administration

Samba – Address family not supported by protocol

After upgrading to Fedora 39, we started having problems with Samba falling over on startup. The server has IPv6 disabled, and (evidently) something is not happy about that. I guess we could enable IPv6, but we don’t really need it.

Adding the following to lines to the GLOBAL section of the smb.conf file and restarting samba sorted it:

bind interfaces only = yes
interfaces = lo eth0

 

Feb 11 06:26:01 systemd[1]: Started smb.service – Samba SMB Daemon.
Feb 11 06:26:01 smbd[1109]: [2024/02/11 06:26:01.285076, 0] ../../source3/smbd/server.c:1091(smbd_open_one_socket)
Feb 11 06:26:01 smbd[1109]: smbd_open_one_socket: open_socket_in failed: Address family not supported by protocol
Feb 11 06:26:01 smbd[1109]: [2024/02/11 06:26:01.290022, 0] ../../source3/smbd/server.c:1091(smbd_open_one_socket)
Feb 11 06:26:01 smbd[1109]: smbd_open_one_socket: open_socket_in failed: Address family not supported by protocol
Feb 11 08:01:43 systemd[1]: Stopping smb.service – Samba SMB Daemon…
Feb 11 08:01:43 systemd[1]: smb.service: Deactivated successfully.
Feb 11 08:01:43 systemd[1]: Stopped smb.service – Samba SMB Daemon.

Updating Fedora — System Boots to Grub Error After Update

If you film the boot sequence and look frame by frame, you’ll see that it very briefly flashes a TPM error

error: ../../grub-core/commands/efi/tpm.c:150:unknown TPM error.

 

From what I’ve been able to glean, this secure boot stuff works off of signatures. Microsoft has signatures in BIOS. Everyone else kind of inserts their keys on the fly … so you can run out of space to save these keys and be unable to boot. To work around this, every time an update gets us over the limit, we go into the secure boot DBX management menu and reset the “Forbidden Signatures” from factory default. This is 13 keys instead of 373, and the OS is able to do it’s “thing” and boot.

 

And I’m actually writing this down this time because I had spent a lot of time researching this last time Scott’s laptop failed to boot and dumped out to a grub menu. This time, I kinda know what we did and why but lost a lot of the details.

RSync to Mirror Local Files

The rsync utility was meant to be used to sync files across the network — to or from an rsync server. For some time, I had a group of friends who shared documents off of my rsync server. Anyone with access could run an rsync command and sync their computer up with the group’s documents. With the advent of online file storage and collaborative editing, this was no longer needed. But I still use rsync to make sure my laptop has a local copy of a folder on the server. Mount /path/to/folder/contents/to/copy to the SMB or NFS share, and the following rsync command ensures the laptop’s /path/to/where/contents/should/be/placed has an exact mirror of the contents of the server folder

rsync –archive –verbose –update –delete “/path/to/folder/contents/to/copy/” “/path/to/where/contents/should/be/placed/”

–archive is a grouping of:
-r recursive
-l copy symlinks
-p preserve permissions
-t preserve modification timestamps
-g preserve group
-o preserve owner
–devices preserve device files (su only)
–specials preserve special files

PowerShell: Mass Active Directory Password Changes

We have a bunch of accounts that function as extra mailboxes — all conveniently housed in on OU. The following PowerShell command sets the password for all of the accounts in one go. Not terribly useful for “real world” use … but useful for testing (and probably something I’ll end up using again)

$OUpath = ‘ou=Mail Aliases,dc=example,dc=com’
$strNewPassword = “What3v3rYu0W@nt1tT0B3”

Get-ADUser -Filter * -SearchBase $OUpath | Set-ADAccountPassword -Reset -NewPassword (ConvertTo-SecureString -AsPlainText $strNewPassword -Force)

ZFS Compression Ratio

We’ve got several PostgreSQL servers using ZFS file system for the database, and I needed to know how compressed the data is. Fortunately, there appears to be a zfs command that does exactly that: report the compression ratio for a zfs file system. Use zfs get compressratio /path/to/mount

Web Proxy Auto Discovery (WPAD) DNS Failure

I wanted to set up automatic proxy discovery on our home network — but it just didn’t work. The website is there, it looks fine … but it doesn’t work. Turns out Microsoft introduced some security idea in Windows 2008 that prevents Windows DNS servers from serving specific names. They “banned” Web Proxy Auto Discovery (WPAD) and Intra-site Automatic Tunnel Addressing Protocol (ISATAP). Even if you’ve got a valid wpad.example.com host recorded in your domain, Windows DNS server says “Nope, no such thing!”. I guess I can appreciate the logic — some malicious actor can hijack all of your connections by tunnelling or proxying your traffic. But … doesn’t the fact I bothered to manually create a hostname kind of clue you into the fact I am trying to do this?!?

I gave up and added the proxy config to my group policy — a few computers, then, needed to be manually configured. It worked. Looking in the event log for a completely different problem, I saw the following entry:

Event ID 6268

The global query block list is a feature that prevents attacks on your  network by blocking DNS queries for specific host names. This feature has caused the DNS server to fail a query with error code NAME ERROR for wpad.example.com. even though data for this DNS name exists in the DNS database. Other queries in all locally authoritative zones for other names
that begin with labels in the block list will also fail, but no event will be logged when further queries are blocked until the DNS server service on this computer is restarted. See product documentation for information about this feature and instructions on how to configure it.

The oddest bit is that this appears to be a substring ‘starts with’ query — like wpadlet or wpadding would also fail? A quick search produced documentation on this Global Query Blocklist … and two quick ways to resolve the issue.

(1) Change the block list to contain only the services you don’t want to use. I don’t use ISATAP, so blocking isatap* hostnames isn’t problematic:

dnscmd /config /globalqueryblocklist isatap

View the current blocklist with:

dnscmd /info /globalqueryblocklist

– Or –

(2) Disable the block list — more risk, but it avoids having to figure this all out again in a few years when a hostname starting with isatap doesn’t work for no reason!

dnscmd /config /enableglobalqueryblocklist 0

 

DIFF’ing JSON

While a locally processed web tool like https://github.com/zgrossbart/jdd can be used to identify differences between two JSON files, regular diff can be used from the command line for simple comparisons. Using jq to sort JSON keys, diff will highlight (pipe bars between the two columns, in this example) where differences appear between two JSON files. Since they keys are sorted, content order doesn’t matter much — it’s possible you’d have a list element 1,2,3 in one and 2,1,3 in another, which wouldn’t be sorted. 

[lisa@fedorahost ~]# diff -y <(jq --sort-keys . 1.json) <(jq --sort-keys . 2.json )
{                                                               {
  "glossary": {                                                   "glossary": {
    "GlossDiv": {                                                   "GlossDiv": {
      "GlossList": {                                                  "GlossList": {
        "GlossEntry": {                                                 "GlossEntry": {
          "Abbrev": "ISO 8879:1986",                                      "Abbrev": "ISO 8879:1986",
          "Acronym": "SGML",                                  |           "Acronym": "XGML",
          "GlossDef": {                                                   "GlossDef": {
            "GlossSeeAlso": [                                               "GlossSeeAlso": [
              "GML",                                                          "GML",
              "XML"                                                           "XML"
            ],                                                              ],
            "para": "A meta-markup language, used to create m               "para": "A meta-markup language, used to create m
          },                                                              },
          "GlossSee": "markup",                                           "GlossSee": "markup",
          "GlossTerm": "Standard Generalized Markup Language"             "GlossTerm": "Standard Generalized Markup Language"
          "ID": "SGML",                                                   "ID": "SGML",
          "SortAs": "SGML"                                    |           "SortAs": "XGML"
        }                                                               }
      },                                                              },
      "title": "S"                                                    "title": "S"
    },                                                              },
    "title": "example glossary"                                     "title": "example glossary"
  }                                                               }
}                                                               }