mirror of https://gitee.com/openkylin/cups.git
144 lines
5.7 KiB
Groff
144 lines
5.7 KiB
Groff
.\"
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.\" client.conf man page for CUPS.
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.\"
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.\" Copyright © 2007-2019 by Apple Inc.
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.\" Copyright © 2006 by Easy Software Products.
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.\"
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.\" Licensed under Apache License v2.0. See the file "LICENSE" for more
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.\" information.
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.\"
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.TH client.conf 5 "CUPS" "15 October 2019" "Apple Inc."
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.SH NAME
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client.conf \- client configuration file for cups (deprecated on macos)
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.SH DESCRIPTION
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The \fBclient.conf\fR file configures the CUPS client and is normally located in the \fI/etc/cups\fR and/or \fI~/.cups\fR directories.
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Each line in the file can be a configuration directive, a blank line, or a comment. Comment lines start with the # character.
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.LP
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\fBNote:\fR Starting with macOS 10.7, this file is only used by command-line and X11 applications plus the IPP backend.
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The \fBServerName\fR directive is not supported on macOS at all.
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Starting with macOS 10.12, all applications can access these settings in the \fI/Library/Preferences/org.cups.PrintingPrefs.plist\fR file instead.
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See the NOTES section below for more information.
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.SS DIRECTIVES
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The following directives are understood by the client. Consult the online help for detailed descriptions:
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.\"#AllowAnyRoot
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.TP 5
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\fBAllowAnyRoot Yes\fR
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.TP 5
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\fBAllowAnyRoot No\fR
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Specifies whether to allow TLS with certificates that have not been signed by a trusted Certificate Authority.
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The default is "Yes".
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.\"#AllowExpiredCerts
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.TP 5
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\fBAllowExpiredCerts Yes\fR
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.TP 5
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\fBAllowExpiredCerts No\fR
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Specifies whether to allow TLS with expired certificates.
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The default is "No".
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.\"#DigestOptions
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.TP 5
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\fBDigestOptions DenyMD5\fR
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.TP 5
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\fBDigestOptions None\fR
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Specifies HTTP Digest authentication options.
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\fBDenyMD5\fR disables support for the original MD5 hash algorithm.
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.\"#Encryption
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.TP 5
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\fBEncryption IfRequested\fR
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.TP 5
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\fBEncryption Never\fR
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.TP 5
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\fBEncryption Required\fR
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Specifies the level of encryption that should be used.
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.\"#GSSServiceName
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.TP 5
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\fBGSSServiceName \fIname\fR
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Specifies the Kerberos service name that is used for authentication, typically "host", "http", or "ipp".
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CUPS adds the remote hostname ("name@server.example.com") for you. The default name is "http".
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.\"#ServerName
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.TP 5
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\fBServerName \fIhostname-or-ip-address\fR[\fI:port\fR]
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.TP 5
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\fBServerName \fI/domain/socket\fR
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Specifies the address and optionally the port to use when connecting to the server.
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\fBNote: This directive is not supported on macOS 10.7 or later.\fR
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.TP 5
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\fBServerName \fIhostname-or-ip-address\fR[\fI:port\fR]\fB/version=1.1\fR
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Specifies the address and optionally the port to use when connecting to a server running CUPS 1.3.12 and earlier.
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.\"#SSLOptions
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.TP 5
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\fBSSLOptions \fR[\fIAllowDH\fR] [\fIAllowRC4\fR] [\fIAllowSSL3\fR] [\fIDenyCBC\fR] [\fIDenyTLS1.0\fR] [\fIMaxTLS1.0\fR] [\fIMaxTLS1.1\fR] [\fIMaxTLS1.2\fR] [\fIMaxTLS1.3\fR] [\fIMinTLS1.0\fR] [\fIMinTLS1.1\fR] [\fIMinTLS1.2\fR] [\fIMinTLS1.3\fR]
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.TP 5
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\fBSSLOptions None\fR
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Sets encryption options (only in /etc/cups/client.conf).
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By default, CUPS only supports encryption using TLS v1.0 or higher using known secure cipher suites.
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Security is reduced when \fIAllow\fR options are used.
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Security is enhanced when \fIDeny\fR options are used.
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The \fIAllowDH\fR option enables cipher suites using plain Diffie-Hellman key negotiation (not supported on systems using GNU TLS).
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The \fIAllowRC4\fR option enables the 128-bit RC4 cipher suites, which are required for some older clients.
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The \fIAllowSSL3\fR option enables SSL v3.0, which is required for some older clients that do not support TLS v1.0.
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The \fIDenyCBC\fR option disables all CBC cipher suites.
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The \fIDenyTLS1.0\fR option disables TLS v1.0 support - this sets the minimum protocol version to TLS v1.1.
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The \fIMinTLS\fR options set the minimum TLS version to support.
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The \fIMaxTLS\fR options set the maximum TLS version to support.
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Not all operating systems support TLS 1.3 at this time.
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.\"#TrustOnFirstUse
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.TP 5
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\fBTrustOnFirstUse Yes\fR
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.TP 5
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\fBTrustOnFirstUse No\fR
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Specifies whether to trust new TLS certificates by default.
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The default is "Yes".
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.\"#User
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.TP 5
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\fBUser \fIname\fR
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Specifies the default user name to use for requests.
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.\"#UserAgentTokens
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.TP 5
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\fBUserAgentTokens None\fR
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.TP 5
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\fBUserAgentTokens ProductOnly\fR
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.TP 5
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\fBUserAgentTokens Major\fR
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.TP 5
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\fBUserAgentTokens Minor\fR
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.TP 5
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\fBUserAgentTokens Minimal\fR
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.TP 5
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\fBUserAgentTokens OS\fR
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.TP 5
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\fBUserAgentTokens Full\fR
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Specifies what information is included in the User-Agent header of HTTP requests.
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"None" disables the User-Agent header.
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"ProductOnly" reports "CUPS".
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"Major" reports "CUPS/major IPP/2".
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"Minor" reports "CUPS/major.minor IPP/2.1".
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"Minimal" reports "CUPS/major.minor.patch IPP/2.1".
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"OS" reports "CUPS/major.minor.path (osname osversion) IPP/2.1".
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"Full" reports "CUPS/major.minor.path (osname osversion; architecture) IPP/2.1".
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The default is "Minimal".
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.\"#ValidateCerts
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.TP 5
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\fBValidateCerts Yes\fR
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.TP 5
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\fBValidateCerts No\fR
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Specifies whether to only allow TLS with certificates whose common name matches the hostname.
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The default is "No".
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.SH NOTES
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The \fBclient.conf\fR file is deprecated on macOS and will no longer be supported in a future version of CUPS.
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Configuration settings can instead be viewed or changed using the
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.BR defaults (1)
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command:
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.nf
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defaults write /Library/Preferences/org.cups.PrintingPrefs.plist Encryption Required
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defaults write /Library/Preferences/org.cups.PrintingPrefs.plist TrustOnFirstUse -bool NO
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defaults read /Library/Preferences/org.cups.PrintingPrefs.plist Encryption
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.fi
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On Linux and other systems using GNU TLS, the \fI/etc/cups/ssl/site.crl\fR file, if present, provides a list of revoked X.509 certificates and is used when validating certificates.
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.SH SEE ALSO
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.BR cups (1),
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.BR default (1),
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CUPS Online Help (http://localhost:631/help)
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.SH COPYRIGHT
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Copyright \[co] 2007-2019 by Apple Inc.
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