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NAME | DESCRIPTION | NOTES | SEE ALSO | COPYRIGHT | COLOPHON |
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client.conf(5) Apple Inc. client.conf(5)
client.conf - client configuration file for cups
The client.conf file configures the CUPS client and is normally
located in the /etc/cups and/or ~/.cups directories. Each line in
the file can be a configuration directive, a blank line, or a
comment. Comment lines start with the # character.
Note: Starting with macOS 10.7, this file is only used by command-
line and X11 applications plus the IPP backend. The ServerName
directive is not supported on macOS at all. Starting with macOS
10.12, all applications can access these settings in the
/Library/Preferences/org.cups.PrintingPrefs.plist file instead. See
the NOTES section below for more information.
DIRECTIVES
The following directives are understood by the client. Consult the
online help for detailed descriptions:
AllowAnyRoot Yes
AllowAnyRoot No
Specifies whether to allow TLS with certificates that have not
been signed by a trusted Certificate Authority. The default is
"Yes".
AllowExpiredCerts Yes
AllowExpiredCerts No
Specifies whether to allow TLS with expired certificates. The
default is "No".
Encryption IfRequested
Encryption Never
Encryption Required
Specifies the level of encryption that should be used.
GSSServiceName name
Specifies the Kerberos service name that is used for
authentication, typically "host", "http", or "ipp". CUPS adds
the remote hostname ("name@server.example.com") for you. The
default name is "http".
ServerName hostname-or-ip-address[:port]
ServerName /domain/socket
Specifies the address and optionally the port to use when
connecting to the server. Note: This directive is not supported
on macOS 10.7 or later.
ServerName hostname-or-ip-address[:port]/version=1.1
Specifies the address and optionally the port to use when
connecting to a server running CUPS 1.3.12 and earlier.
SSLOptions [AllowDH] [AllowRC4] [AllowSSL3] [DenyCBC] [DenyTLS1.0]
[MaxTLS1.0] [MaxTLS1.1] [MaxTLS1.2] [MaxTLS1.3] [MinTLS1.0]
[MinTLS1.1] [MinTLS1.2] [MinTLS1.3]
SSLOptions None
Sets encryption options (only in /etc/cups/client.conf). By
default, CUPS only supports encryption using TLS v1.0 or higher
using known secure cipher suites. Security is reduced when
Allow options are used. Security is enhanced when Deny options
are used. The AllowDH option enables cipher suites using plain
Diffie-Hellman key negotiation (not supported on systems using
GNU TLS). The AllowRC4 option enables the 128-bit RC4 cipher
suites, which are required for some older clients. The
AllowSSL3 option enables SSL v3.0, which is required for some
older clients that do not support TLS v1.0. The DenyCBC option
disables all CBC cipher suites. The DenyTLS1.0 option disables
TLS v1.0 support - this sets the minimum protocol version to TLS
v1.1. The MinTLS options set the minimum TLS version to
support. The MaxTLS options set the maximum TLS version to
support. Not all operating systems support TLS 1.3 at this
time.
TrustOnFirstUse Yes
TrustOnFirstUse No
Specifies whether to trust new TLS certificates by default. The
default is "Yes".
User name
Specifies the default user name to use for requests.
ValidateCerts Yes
ValidateCerts No
Specifies whether to only allow TLS with certificates whose
common name matches the hostname. The default is "No".
The client.conf file is deprecated on macOS and will no longer be
supported in a future version of CUPS. Configuration settings can
instead be viewed or changed using the defaults(1) command:
defaults write /Library/Preferences/org.cups.PrintingPrefs.plist Encryption Required
defaults write /Library/Preferences/org.cups.PrintingPrefs.plist TrustOnFirstUse -bool NO
defaults read /Library/Preferences/org.cups.PrintingPrefs.plist Encryption
On Linux and other systems using GNU TLS, the /etc/cups/ssl/site.crl
file, if present, provides a list of revoked X.509 certificates and
is used when validating certificates.
cups(1), default(1), CUPS Online Help (http://localhost:631/help)
Copyright © 2007-2018 by Apple Inc.
This page is part of the CUPS (a standards-based, open source
printing system) project. Information about the project can be found
at ⟨http://www.cups.org/⟩. If you have a bug report for this manual
page, see ⟨http://www.cups.org/⟩. This page was obtained from the
project's upstream Git repository ⟨https://github.com/apple/cups⟩ on
2018-02-02. (At that time, the date of the most recent commit that
was found in the repository was 2018-02-01.) 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
3 November 2017 CUPS client.conf(5)
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