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NAME | DESCRIPTION | NOTES | SEE ALSO | COPYRIGHT | COLOPHON |
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client.conf(5) OpenPrinting client.conf(5)
client.conf - client configuration file for cups (deprecated on
macos)
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".
DigestOptions DenyMD5
DigestOptions None
Specifies HTTP Digest authentication options. DenyMD5
disables support for the original MD5 hash algorithm.
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] [NoSystem]
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. The NoSystem option
disables applying system cryptographic policy. 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.
UserAgentTokens None
UserAgentTokens ProductOnly
UserAgentTokens Major
UserAgentTokens Minor
UserAgentTokens Minimal
UserAgentTokens OS
UserAgentTokens Full
Specifies what information is included in the User-Agent
header of HTTP requests. "None" disables the User-Agent
header. "ProductOnly" reports "CUPS". "Major" reports
"CUPS/major IPP/2". "Minor" reports "CUPS/major.minor
IPP/2.1". "Minimal" reports "CUPS/major.minor.patch
IPP/2.1". "OS" reports "CUPS/major.minor.path (osname
osversion) IPP/2.1". "Full" reports "CUPS/major.minor.path
(osname osversion; architecture) IPP/2.1". The default is
"Minimal".
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 © 2020-2024 by OpenPrinting.
This page is part of the CUPS (a standards-based, open source
printing system) project. Information about the project can be
found at ⟨https://github.com/openprinting/cups⟩. If you have a
bug report for this manual page, see
⟨https://github.com/OpenPrinting/cups/issues⟩. This page was
obtained from the project's upstream Git repository
⟨https://github.com/openprinting/cups⟩ on 2025-02-02. (At that
time, the date of the most recent commit that was found in the
repository was 2025-01-27.) 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
2021-02-28 CUPS client.conf(5)
Pages that refer to this page: cups(1)
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HTML rendering created 2025-02-02 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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