[thirdparty/cups.git] / man / client.conf.man.in

.\"
.\" client.conf man page for CUPS.
.\"
.\" Copyright 2007-2017 by Apple Inc.
.\" Copyright 2006 by Easy Software Products.
.\"
.\" Licensed under Apache License v2.0.  See the file "LICENSE" for more information.
.\"
.TH client.conf 5 "CUPS" "3 November 2017" "Apple Inc."
.SH NAME
client.conf \- client configuration file for cups
.SH DESCRIPTION
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.
Each line in the file can be a configuration directive, a blank line, or a comment. Comment lines start with the # character.
.LP
\fBNote:\fR Starting with macOS 10.7, this file is only used by command-line and X11 applications plus the IPP backend.
The \fBServerName\fR directive is not supported on macOS at all.
Starting with macOS 10.12, all applications can access these settings in the \fI/Library/Preferences/org.cups.PrintingPrefs.plist\fR file instead.
See the NOTES section below for more information.
.SS DIRECTIVES
The following directives are understood by the client. Consult the online help for detailed descriptions:
.TP 5
\fBAllowAnyRoot Yes\fR
.TP 5
\fBAllowAnyRoot No\fR
Specifies whether to allow TLS with certificates that have not been signed by a trusted Certificate Authority.
The default is "Yes".
.TP 5
\fBAllowExpiredCerts Yes\fR
.TP 5
\fBAllowExpiredCerts No\fR
Specifies whether to allow TLS with expired certificates.
The default is "No".
.TP 5
\fBEncryption IfRequested\fR
.TP 5
\fBEncryption Never\fR
.TP 5
\fBEncryption Required\fR
Specifies the level of encryption that should be used.
.TP 5
\fBGSSServiceName \fIname\fR
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".
.TP 5
\fBServerName \fIhostname-or-ip-address\fR[\fI:port\fR]
.TP 5
\fBServerName \fI/domain/socket\fR
Specifies the address and optionally the port to use when connecting to the server.
\fBNote: This directive is not supported on macOS 10.7 or later.\fR
.TP 5
\fBServerName \fIhostname-or-ip-address\fR[\fI:port\fR]\fB/version=1.1\fR
Specifies the address and optionally the port to use when connecting to a server running CUPS 1.3.12 and earlier.
.TP 5
\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]
.TP 5
\fBSSLOptions None\fR
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 \fIAllow\fR options are used.
Security is enhanced when \fIDeny\fR options are used.
The \fIAllowDH\fR option enables cipher suites using plain Diffie-Hellman key negotiation (not supported on systems using GNU TLS).
The \fIAllowRC4\fR option enables the 128-bit RC4 cipher suites, which are required for some older clients.
The \fIAllowSSL3\fR option enables SSL v3.0, which is required for some older clients that do not support TLS v1.0.
The \fIDenyCBC\fR option disables all CBC cipher suites.
The \fIDenyTLS1.0\fR option disables TLS v1.0 support - this sets the minimum protocol version to TLS v1.1.
The \fIMinTLS\fR options set the minimum TLS version to support.
The \fIMaxTLS\fR options set the maximum TLS version to support.
Not all operating systems support TLS 1.3 at this time.
.TP 5
\fBTrustOnFirstUse Yes\fR
.TP 5
\fBTrustOnFirstUse No\fR
Specifies whether to trust new TLS certificates by default.
The default is "Yes".
.TP 5
\fBUser \fIname\fR
Specifies the default user name to use for requests.
.TP 5
\fBValidateCerts Yes\fR
.TP 5
\fBValidateCerts No\fR
Specifies whether to only allow TLS with certificates whose common name matches the hostname.
The default is "No".
.SH NOTES
The \fBclient.conf\fR 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
.BR defaults (1)
command:
.nf
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
.fi
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.
.SH SEE ALSO
.BR cups (1),
.BR default (1),
CUPS Online Help (http://localhost:631/help)
.SH COPYRIGHT
Copyright \[co] 2007-2017 by Apple Inc.
Commit	Line	Data
b423cd4c	1	.\"
7131e285	2	.\" client.conf man page for CUPS.
b423cd4c	3	.\"
f2e87147	4	.\" Copyright 2007-2017 by Apple Inc.
7131e285	5	.\" Copyright 2006 by Easy Software Products.
b423cd4c	6	.\"
e3101897	7	.\" Licensed under Apache License v2.0. See the file "LICENSE" for more information.
b423cd4c	8	.\"
8f1fbdec	9	.TH client.conf 5 "CUPS" "3 November 2017" "Apple Inc."
b423cd4c	10	.SH NAME
08d56b1f	11	client.conf \- client configuration file for cups
b423cd4c	12	.SH DESCRIPTION
7131e285 MS	13	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.
	14	Each line in the file can be a configuration directive, a blank line, or a comment. Comment lines start with the # character.
	15	.LP
8072030b MS	16	\fBNote:\fR Starting with macOS 10.7, this file is only used by command-line and X11 applications plus the IPP backend.
	17	The \fBServerName\fR directive is not supported on macOS at all.
	18	Starting with macOS 10.12, all applications can access these settings in the \fI/Library/Preferences/org.cups.PrintingPrefs.plist\fR file instead.
08d56b1f	19	See the NOTES section below for more information.
7131e285 MS	20	.SS DIRECTIVES
7131e285 MS	21	The following directives are understood by the client. Consult the online help for detailed descriptions:
b423cd4c	22	.TP 5
f51f3773	23	\fBAllowAnyRoot Yes\fR
f9988e18	24	.TP 5
f51f3773	25	\fBAllowAnyRoot No\fR
f9988e18	26	Specifies whether to allow TLS with certificates that have not been signed by a trusted Certificate Authority.
f51f3773	27	The default is "Yes".
f9988e18	28	.TP 5
f51f3773	29	\fBAllowExpiredCerts Yes\fR
f9988e18	30	.TP 5
f51f3773	31	\fBAllowExpiredCerts No\fR
f9988e18	32	Specifies whether to allow TLS with expired certificates.
08d56b1f	33	The default is "No".
f9988e18	34	.TP 5
7131e285	35	\fBEncryption IfRequested\fR
b423cd4c	36	.TP 5
7131e285	37	\fBEncryption Never\fR
b423cd4c	38	.TP 5
7131e285 MS	39	\fBEncryption Required\fR
7131e285 MS	40	Specifies the level of encryption that should be used.
b423cd4c	41	.TP 5
7131e285 MS	42	\fBGSSServiceName \fIname\fR
	43	Specifies the Kerberos service name that is used for authentication, typically "host", "http", or "ipp".
	44	CUPS adds the remote hostname ("name@server.example.com") for you. The default name is "http".
07ed0e9a	45	.TP 5
7131e285	46	\fBServerName \fIhostname-or-ip-address\fR[\fI:port\fR]
b423cd4c	47	.TP 5
7131e285 MS	48	\fBServerName \fI/domain/socket\fR
7131e285 MS	49	Specifies the address and optionally the port to use when connecting to the server.
21d8d62b	50	\fBNote: This directive is not supported on macOS 10.7 or later.\fR
3e7fe0ca	51	.TP 5
7131e285 MS	52	\fBServerName \fIhostname-or-ip-address\fR[\fI:port\fR]\fB/version=1.1\fR
7131e285 MS	53	Specifies the address and optionally the port to use when connecting to a server running CUPS 1.3.12 and earlier.
3699c637	54	.TP 5
8f1fbdec	55	\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]
63aefcd5 MS	56	.TP 5
	57	\fBSSLOptions None\fR
	58	Sets encryption options (only in /etc/cups/client.conf).
	59	By default, CUPS only supports encryption using TLS v1.0 or higher using known secure cipher suites.
02c88e67 MS	60	Security is reduced when \fIAllow\fR options are used.
	61	Security is enhanced when \fIDeny\fR options are used.
	62	The \fIAllowDH\fR option enables cipher suites using plain Diffie-Hellman key negotiation (not supported on systems using GNU TLS).
	63	The \fIAllowRC4\fR option enables the 128-bit RC4 cipher suites, which are required for some older clients.
63aefcd5	64	The \fIAllowSSL3\fR option enables SSL v3.0, which is required for some older clients that do not support TLS v1.0.
f2e87147	65	The \fIDenyCBC\fR option disables all CBC cipher suites.
ee6226a5	66	The \fIDenyTLS1.0\fR option disables TLS v1.0 support - this sets the minimum protocol version to TLS v1.1.
dda99de9 MS	67	The \fIMinTLS\fR options set the minimum TLS version to support.
dda99de9 MS	68	The \fIMaxTLS\fR options set the maximum TLS version to support.
8f1fbdec	69	Not all operating systems support TLS 1.3 at this time.
63aefcd5	70	.TP 5
08d56b1f MS	71	\fBTrustOnFirstUse Yes\fR
	72	.TP 5
	73	\fBTrustOnFirstUse No\fR
	74	Specifies whether to trust new TLS certificates by default.
	75	The default is "Yes".
	76	.TP 5
7131e285	77	\fBUser \fIname\fR
3e7fe0ca	78	Specifies the default user name to use for requests.
f51f3773 MS	79	.TP 5
	80	\fBValidateCerts Yes\fR
	81	.TP 5
	82	\fBValidateCerts No\fR
	83	Specifies whether to only allow TLS with certificates whose common name matches the hostname.
	84	The default is "No".
7131e285	85	.SH NOTES
8072030b	86	The \fBclient.conf\fR file is deprecated on macOS and will no longer be supported in a future version of CUPS.
08d56b1f MS	87	Configuration settings can instead be viewed or changed using the
	88	.BR defaults (1)
	89	command:
	90	.nf
	91	defaults write /Library/Preferences/org.cups.PrintingPrefs.plist Encryption Required
	92	defaults write /Library/Preferences/org.cups.PrintingPrefs.plist TrustOnFirstUse -bool NO
	93
	94	defaults read /Library/Preferences/org.cups.PrintingPrefs.plist Encryption
	95	.fi
	96	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.
b423cd4c	97	.SH SEE ALSO
7131e285	98	.BR cups (1),
08d56b1f	99	.BR default (1),
7131e285	100	CUPS Online Help (http://localhost:631/help)
b423cd4c	101	.SH COPYRIGHT
bd5a2f28	102	Copyright \[co] 2007-2017 by Apple Inc.