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NAME | SYNOPSIS | DESCRIPTION | KEY MANAGEMENT | SEE ALSO | NOTES | COLOPHON |
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SYSTEMD-HOMED.SERVICE(8) systemd-homed.service SYSTEMD-HOMED.SERVICE(8)
systemd-homed.service, systemd-homed - Home Area/User Account
Manager
systemd-homed.service
/usr/lib/systemd/systemd-homed
systemd-homed is a system service that may be used to create,
remove, change or inspect home areas (directories and network
mounts and real or loopback block devices with a filesystem,
optionally encrypted).
Most of systemd-homed's functionality is accessible through the
homectl(1) command.
See the Home Directories[1] documentation for details about the
format and design of home areas managed by systemd-homed.service.
Each home directory managed by systemd-homed.service synthesizes
a local user and group. These are made available to the system
using the User/Group Record Lookup API via Varlink[2], and thus
may be browsed with userdbctl(1).
systemd-homed.service also manages blob directories for each home
directory it manages. See User Record Blob Directories[3] for
more details.
User records are cryptographically signed with a public/private
key pair (the signature is part of the JSON record itself). For a
user to be permitted to log in locally the public key matching
the signature of their user record must be installed. For a user
record to be modified locally the private key matching the
signature must be installed locally, too. The keys are stored in
the /var/lib/systemd/home/ directory:
/var/lib/systemd/home/local.private
The private key of the public/private key pair used for local
records. Currently, only a single such key may be installed.
Added in version 246.
/var/lib/systemd/home/local.public
The public key of the public/private key pair used for local
records. Currently, only a single such key may be installed.
Added in version 246.
/var/lib/systemd/home/*.public
Additional public keys. Any users whose user records are
signed with any of these keys are permitted to log in
locally. An arbitrary number of keys may be installed this
way.
Added in version 246.
All key files listed above are in PEM format.
In order to migrate a home directory from a host "foobar" to
another host "quux" it is hence sufficient to copy
/var/lib/systemd/home/local.public from the host "foobar" to
"quux", maybe calling the file on the destination
/var/lib/systemd/home/foobar.public, reflecting the origin of the
key. If the user record should be modifiable on "quux" the pair
/var/lib/systemd/home/local.public and
/var/lib/systemd/home/local.private need to be copied from
"foobar" to "quux", and placed under the identical paths there,
as currently only a single private key is supported per host.
Note of course that the latter means that user records
generated/signed before the key pair is copied in, lose their
validity.
systemd(1), homed.conf(5), homectl(1), pam_systemd_home(8),
userdbctl(1), org.freedesktop.home1(5)
1. Home Directories
https://systemd.io/HOME_DIRECTORY
2. User/Group Record Lookup API via Varlink
https://systemd.io/USER_GROUP_API
3. User Record Blob Directories
https://systemd.io/USER_RECORD_BLOB_DIRS
This page is part of the systemd (systemd system and service
manager) project. Information about the project can be found at
⟨http://www.freedesktop.org/wiki/Software/systemd⟩. If you have
a bug report for this manual page, see
⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩.
This page was obtained from the project's upstream Git repository
⟨https://github.com/systemd/systemd.git⟩ on 2024-06-14. (At that
time, the date of the most recent commit that was found in the
repository was 2024-06-13.) If you discover any rendering
problems in this HTML version of the page, or you believe there
is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
systemd 257~devel SYSTEMD-HOMED.SERVICE(8)
Pages that refer to this page: homectl(1), userdbctl(1), mount_setattr(2), homed.conf(5), org.freedesktop.home1(5), systemd.exec(5), systemd.directives(7), systemd.index(7), nss-systemd(8), pam_systemd(8), pam_systemd_home(8), systemd-userdbd.service(8)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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