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download PDF document: client.conf.5.pdf

client.conf(5) OpenPrinting client.conf(5)
NAME client.conf - client configuration file for cups (deprecated on macos)
DESCRIPTION The client.conf file configures the CUPS client and is normally located in the /usr/local/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
[MaxTLS1.0] [MaxTLS1.1] [MaxTLS1.2] [MaxTLS1.3] [MinTLS1.0] [MinTLS1.1] [MinTLS1.2] [MinTLS1.3]
SSLOptions None Sets encryption options (only in /usr/local/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.
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".
NOTES The client.conf file is deprecated on macOS and will no longer be /usr/local/etc/cups/ssl/site.crl file, if present, provides a list of revoked X.509 certificates and is used when validating certificates.
SEE ALSO cups(1), default(1), CUPS Online Help (http://localhost:631/help)
COPYRIGHT Copyright (C) 2021-2023 by OpenPrinting.
2021-02-28 CUPS client.conf(5)