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+////
+Copyright (C) 2013 Red Hat, Inc.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+////
+
+
+update-ca-trust(8)
+==================
+:doctype: manpage
+:man source: update-ca-trust
+
+
+NAME
+----
+update-ca-trust - manage consolidated and dynamic configuration of CA 
+certificates and associated trust
+
+
+SYNOPSIS
+--------
+*update-ca-trust* ['COMMAND']
+
+
+DESCRIPTION
+-----------
+update-ca-trust(8) is used to manage a consolidated and dynamic configuration 
+feature of Certificate Authority (CA) certificates and associated trust.
+
+The feature is available for new applications that read the
+consolidated configuration files found in the /etc/ssl/certs or /etc/ca-certificates/extracted directories
+or that load the PKCS#11 module p11-kit-trust.so
+
+Parts of the new feature are also provided in a way to make it useful
+for legacy applications.
+
+Many legacy applications expect CA certificates and trust configuration
+in a fixed location, contained in files with particular path and name,
+or by referring to a classic PKCS#11 trust module provided by the 
+NSS cryptographic library.
+
+The dynamic configuration feature provides functionally compatible replacements 
+for classic configuration files and for the classic NSS trust module named libnssckbi.
+
+In order to enable legacy applications, that read the classic files or 
+access the classic module, to make use of the new consolidated and dynamic configuration 
+feature, some classic filenames have been changed to symbolic links.
+The symbolic links refer to dynamically created and consolidated 
+output stored below the /etc/ca-certificates/extracted directory hierarchy.
+
+The output is produced using the 'update-ca-trust' command (without parameters),
+or using the 'update-ca-trust extract' command.
+In order to produce the output, a flexible set of source configuration
+is read, as described in section <<sourceconf,SOURCE CONFIGURATION>>.
+
+In addition, the classic PKCS#11 module 
+is replaced with a new PKCS#11 module (p11-kit-trust.so) that dynamically 
+reads the same source configuration.
+
+
+[[sourceconf]]
+SOURCE CONFIGURATION
+--------------------
+The dynamic configuration feature uses several source directories that
+will be scanned for any number of source files. *It is important to select 
+the correct subdirectory for adding files, as the subdirectory defines how 
+contained certificates will be trusted or distrusted, and which file formats are read.*
+
+Files in subdirectories below the directory hierarchy /usr/share/ca-certificates/trust-source/ contain CA certificates and 
+trust settings in the PEM file format. The trust settings found here will be
+interpreted with a *low priority*.
+
+Files in subdirectories below the directory hierarchy /etc/ca-certificates/trust-source/ contain CA certificates and 
+trust settings in the PEM file format. The trust settings found here will be
+interpreted with a *high priority*.
+
+.You may use the following rules of thumb to decide, whether your configuration files should be added to the /etc or rather to the /usr directory hierarchy:
+* If you are manually adding a configuration file to a system, you probably 
+want it to override any other default configuration, and you most likely should
+add it to the respective subdirectory in the /etc hierarchy.
+* If you are creating a package that provides additional root CA certificates,
+that is intended for distribution to several computer systems, but you still
+want to allow the administrator to override your list, then your package should 
+add your files to the respective subdirectory in the /usr hierarchy.
+* If you are creating a package that is supposed to override the default system
+trust settings, that is intended for distribution to several computer systems, then your package should install the files to the respective
+subdirectory in the /etc hierarchy.
+
+.*QUICK HELP 1*: To add a certificate in the simple PEM or DER file formats to the list of CAs trusted on the system:
+* add it as a new file to directory /etc/ca-certificates/trust-source/anchors/
+* run 'update-ca-trust extract'
+
+.*QUICK HELP 2*: If your certificate is in the extended BEGIN TRUSTED file format (which may contain distrust/blacklist trust flags, or trust flags for usages other than TLS) then:
+* add it as a new file to directory /etc/ca-certificates/trust-source/
+* run 'update-ca-trust extract'
+
+.In order to offer simplicity and flexibility, the way certificate files are treated depends on the subdirectory they are installed to.
+* simple trust anchors subdirectory: /usr/share/ca-certificates/trust-source/anchors/ or /etc/ca-certificates/trust-source/anchors/
+* simple blacklist (distrust) subdirectory: /usr/share/ca-certificates/trust-source/blacklist/ or /etc/ca-certificates/trust-source/blacklist/
+* extended format directory: /usr/share/ca-certificates/trust-source/ or /etc/ca-certificates/trust-source/
+
+.In the main directories /usr/share/ca-certificates/trust-source/ or /etc/ca-certificates/trust-source/ you may install one or multiple files in the following file formats:
+* certificate files that include trust flags,
+  in the BEGIN/END TRUSTED CERTIFICATE file format
+  (any file name), which have been created using the openssl x509 tool
+  and the -addreject -addtrust options.
+  Bundle files with multiple certificates are supported.
+* files in the p11-kit file format using the .p11-kit file name
+  extension, which can (e.g.) be used to distrust certificates
+  based on serial number and issuer name, without having the
+  full certificate available.
+  (This is currently an undocumented format, to be extended later.
+   For examples of the supported formats, see the files
+   shipped with the ca-certificates-mozilla package.)
+* certificate files without trust flags in either the DER file format or in
+  the PEM (BEGIN/END CERTIFICATE) file format (any file name). Such files 
+  will be added with neutral trust, neither trusted nor distrusted.
+  They will simply be known to the system, which might be helpful to
+  assist cryptographic software in constructing chains of certificates.
+  (If you want a CA certificate in these file formats to be trusted, you 
+   should remove it from this directory and move it to the 
+   ./anchors subdirectory instead.)
+
+In the anchors subdirectories /usr/share/ca-certificates/trust-source/anchors/ or /etc/ca-certificates/trust-source/anchors/
+you may install one or multiple certificates in either the DER file
+format or in the PEM (BEGIN/END CERTIFICATE) file format.
+Each certificate will be treated as *trusted* for all purposes.
+
+In the blacklist subdirectories /usr/share/ca-certificates/trust-source/blacklist/ or /etc/ca-certificates/trust-source/blacklist/
+you may install one or multiple certificates in either the DER file
+format or in the PEM (BEGIN/END CERTIFICATE) file format.
+Each certificate will be treated as *distrusted* for all purposes.
+
+Please refer to the x509(1) manual page for the documentation of the 
+BEGIN/END CERTIFICATE and BEGIN/END TRUSTED CERTIFICATE file formats.
+
+Applications that rely on a static file for a list of trusted CAs
+may load one of the files found in the /etc/ssl/certs or /etc/ca-certificates/extracted
+directory. After modifying any file in the
+/usr/share/ca-certificates/trust-source/ or /etc/ca-certificates/trust-source/
+directories or in any of their subdirectories, or after adding a file, 
+it is necessary to run the 'update-ca-trust extract' command,
+in order to update the consolidated files in /etc/ssl/certs or /etc/ca-certificates/extracted/ .
+
+Applications that load the classic PKCS#11 module using filename libnssckbi.so 
+(which has been converted into a symbolic link pointing to the new module)
+and any application capable of 
+loading PKCS#11 modules and loading p11-kit-trust.so, will benefit from
+the dynamically merged set of certificates and trust information stored in the
+/usr/share/ca-certificates/trust-source/ and /etc/ca-certificates/trust-source/ directories.
+
+
+[[extractconf]]
+EXTRACTED CONFIGURATION
+-----------------------
+The directories /etc/ssl/certs and /etc/ca-certificates/extracted/ contains generated CA certificate 
+bundle files which are created and updated, based on the <<sourceconf,SOURCE CONFIGURATION>> 
+by running the 'update-ca-trust extract' command.
+
+If your application isn't able to load the PKCS#11 module p11-kit-trust.so,
+then you can use these files in your application to load a list of global
+root CA certificates.
+
+Please never manually edit the files stored in these directories,
+because your changes will be lost and the files automatically overwritten,
+each time the 'update-ca-trust extract' command gets executed.
+
+In order to install new trusted or distrusted certificates,
+please rather install them in the respective subdirectory below the
+/usr/share/ca-certificates/trust-source/ or /etc/ca-certificates/trust-source/
+directories, as described in the <<sourceconf,SOURCE CONFIGURATION>> section.
+
+The directory /etc/ssl/certs contains a OpenSSL-cadir-style hash farm.
+Distrust information cannot be represented in this format,
+and distrusted certificates are missing from these files.
+
+The directory /etc/ssl/certs/java contains 
+a CA certificate bundle in the java keystore file format.
+Distrust information cannot be represented in this file format,
+and distrusted certificates are missing from these files.
+File cacerts contains CA certificates trusted for TLS server authentication.
+
+The directory /etc/ca-certificates/extracted contains 
+CA certificate bundle files in the simple BEGIN/END CERTIFICATE file format, 
+as decribed in the x509(1) manual page.
+Distrust information cannot be represented in this file format,
+and distrusted certificates are missing from these files.
+File tls-ca-bundle.pem contains CA certificates 
+trusted for TLS server authentication.
+File email-ca-bundle.pem contains CA certificates 
+trusted for E-Mail protection.
+File objsign-ca-bundle.pem contains CA certificates 
+trusted for code signing.
+File ca-bundle.trust.crt contains certificates in the extended
+BEGIN/END TRUSTED CERTIFICATE file format, as described in the x509(1) manual page.
+This bundle contains the full set of all trusted
+and distrusted certificates, including the associated trust flags.
+
+
+COMMANDS
+--------
+(absent/empty command)::
+    Same as the *extract* command described below. (However, the command may
+    print fewer warnings, as this command is being run during package 
+    installation, where non-fatal status output is undesired.)
+
+*extract*::
+    Instruct update-ca-trust to scan the <<sourceconf,SOURCE CONFIGURATION>> and produce 
+    updated versions of the consolidated configuration files stored below
+    the /etc/ssl/certs and /etc/ca-certificates/extracted directory 
+    hierarchies.
+
+FILES
+-----
+/usr/share/ca-certificates/trust-source::
+	Contains multiple, low priority source configuration files as explained in section <<sourceconf,SOURCE CONFIGURATION>>. Please pay attention to the specific meanings of the respective subdirectories.
+
+/etc/ca-certificates/trust-source::
+	Contains multiple, high priority source configuration files as explained in section <<sourceconf,SOURCE CONFIGURATION>>. Please pay attention to the specific meanings of the respective subdirectories.
+
+/etc/ca-certificates/extracted::
+	Contains consolidated and automatically generated configuration files for consumption by applications, 
+	which are created using the 'update-ca-trust extract' command. Don't edit files in this directory, because they will be overwritten.
+	See section <<extractconf,EXTRACTED CONFIGURATION>> for additional details.
+
+/etc/ca-certificates/extracted/tls-ca-bundle.pem::
+	Contains a list of CA certificates trusted for TLS server authentication, in the simple BEGIN/END CERTIFICATE file format, without distrust information.
+
+/etc/ca-certificates/extracted/email-ca-bundle.pem::
+	Contains a list of CA certificates trusted for E-Mail protection, in the simple BEGIN/END CERTIFICATE file format, without distrust information.
+
+/etc/ca-certificates/extracted/objsign-ca-bundle.pem::
+	Contains a list of CA certificates trusted for code signing, in the simple BEGIN/END CERTIFICATE file format, without distrust information.
+
+/etc/ca-certificates/extracted/ca-bundle.trust.crt::
+	Contains a list of CA certificates in the extended BEGIN/END TRUSTED CERTIFICATE file format, which includes trust (and/or distrust) flags specific to certificate usage.
+
+/etc/ca-certificates/extracted/cadir::
+	Contains individual CA certificates trusted for TLS server authentication usage, in the simple BEGIN/END CERTIFICATE file format, without distrust information.
+        Also includes the necessary hash symlinks expected by OpenSSL.
+
+/etc/ssl/certs::
+	Classic directory, contains symlinks into /etc/ca-certificates/extracted/cadir which are maintained by the update-ca-trust command.
+
+/etc/ssl/certs/ca-certificates.crt::
+	Classic filename, a symlink to /etc/ca-certificates/extracted/tls-ca-bundle.pem.
+
+/etc/ssl/cert.pem::
+	Classic filename, a symlink to /etc/ca-certificates/extracted/tls-ca-bundle.pem.
+
+/etc/ssl/java/cacerts::
+	Classic filename, contains a list of CA certificates trusted for TLS server authentication usage, in the Java keystore file format, without distrust information.
+	This file is consolidated output created by the update-ca-trust command.
+
+AUTHOR
+------
+Written by Kai Engert and Stef Walter.