APT-KEY(8) APT APT-KEY(8)
NAME
apt-key - APT key management utility
SYNOPSIS
apt-key [--keyring filename] {add filename | del keyid | export keyid |
exportall | list | finger | adv | update | net-update |
{-v | --version} | {-h | --help}}
DESCRIPTION
apt-key is used to manage the list of keys used by apt to authenticate
packages. Packages which have been authenticated using these keys will
be considered trusted.
Note that if usage of apt-key is desired the additional installation of
the GNU Privacy Guard suite (packaged in gnupg) is required. For this
reason alone the programmatic usage (especially in package maintainer
scripts!) is strongly discouraged. Further more the output format of
all commands is undefined and can and does change whenever the
underlying commands change. apt-key will try to detect such usage and
generates warnings on stderr in these cases.
SUPPORTED KEYRING FILES
apt-key supports only the binary OpenPGP format (also known as "GPG key
public ring") in files with the "gpg" extension, not the keybox
database format introduced in newer gpg(1) versions as default for
keyring files. Binary keyring files intended to be used with any apt
version should therefore always be created with gpg --export.
Alternatively, if all systems which should be using the created keyring
have at least apt version >= 1.4 installed, you can use the ASCII
armored format with the "asc" extension instead which can be created
with gpg --armor --export.
COMMANDS
add filename
Add a new key to the list of trusted keys. The key is read from the
filename given with the parameter filename or if the filename is -
from standard input.
It is critical that keys added manually via apt-key are verified to
belong to the owner of the repositories they claim to be for
otherwise the apt-secure(8) infrastructure is completely
undermined.
Note: Instead of using this command a keyring should be placed
directly in the /etc/apt/trusted.gpg.d/ directory with a
descriptive name and either "gpg" or "asc" as file extension.
del keyid
Remove a key from the list of trusted keys.
export keyid
Output the key keyid to standard output.
exportall
Output all trusted keys to standard output.
list, finger
List trusted keys with fingerprints.
adv
Pass advanced options to gpg. With adv --recv-key you can e.g.
download key from keyservers directly into the trusted set of keys.
Note that there are no checks performed, so it is easy to
completely undermine the apt-secure(8) infrastructure if used
without care.
update (deprecated)
Update the local keyring with the archive keyring and remove from
the local keyring the archive keys which are no longer valid. The
archive keyring is shipped in the archive-keyring package of your
distribution, e.g. the debian-archive-keyring package in Debian.
Note that a distribution does not need to and in fact should not
use this command any longer and instead ship keyring files in the
/etc/apt/trusted.gpg.d/ directory directly as this avoids a
dependency on gnupg and it is easier to manage keys by simply
adding and removing files for maintainers and users alike.
net-update
Perform an update working similarly to the update command above,
but get the archive keyring from a URI instead and validate it
against a master key. This requires an installed wget(1) and an APT
build configured to have a server to fetch from and a master
keyring to validate. APT in Debian does not support this command,
relying on update instead, but Ubuntu's APT does.
OPTIONS
Note that options need to be defined before the commands described in
the previous section.
--keyring filename
With this option it is possible to specify a particular keyring
file the command should operate on. The default is that a command
is executed on the trusted.gpg file as well as on all parts in the
trusted.gpg.d directory, though trusted.gpg is the primary keyring
which means that e.g. new keys are added to this one.
FILES
/etc/apt/trusted.gpg
Keyring of local trusted keys, new keys will be added here.
Configuration Item: Dir::Etc::Trusted.
/etc/apt/trusted.gpg.d/
File fragments for the trusted keys, additional keyrings can be
stored here (by other packages or the administrator). Configuration
Item Dir::Etc::TrustedParts.
SEE ALSO
apt-get(8), apt-secure(8)
BUGS
APT bug page[1]. If you wish to report a bug in APT, please see
/usr/share/doc/debian/bug-reporting.txt or the reportbug(1) command.
AUTHOR
APT was written by the APT team <apt@packages.debian.org>.
AUTHORS
Jason Gunthorpe
APT team
NOTES
1. APT bug page
http://bugs.debian.org/src:apt
APT 2.1.7 04 April 2019 APT-KEY(8)