MODUTIL(1) NSS Security Tools MODUTIL(1)
NAME
modutil - Manage PKCS #11 module information within the security module
database.
SYNOPSIS
modutil [options] [[arguments]]
STATUS
This documentation is still work in progress. Please contribute to the
initial review in Mozilla NSS bug 836477[1]
DESCRIPTION
The Security Module Database Tool, modutil, is a command-line utility
for managing PKCS #11 module information both within secmod.db files
and within hardware tokens. modutil can add and delete PKCS #11
modules, change passwords on security databases, set defaults, list
module contents, enable or disable slots, enable or disable FIPS 140-2
compliance, and assign default providers for cryptographic operations.
This tool can also create certificate, key, and module security
database files.
The tasks associated with security module database management are part
of a process that typically also involves managing key databases and
certificate databases.
OPTIONS
Running modutil always requires one (and only one) option to specify
the type of module operation. Each option may take arguments, anywhere
from none to multiple arguments.
Options
-add modulename
Add the named PKCS #11 module to the database. Use this option with
the -libfile, -ciphers, and -mechanisms arguments.
-changepw tokenname
Change the password on the named token. If the token has not been
initialized, this option initializes the password. Use this option
with the -pwfile and -newpwfile arguments. A password is equivalent
to a personal identification number (PIN).
-chkfips
Verify whether the module is in the given FIPS mode. true means to
verify that the module is in FIPS mode, while false means to verify
that the module is not in FIPS mode.
-create
Create new certificate, key, and module databases. Use the -dbdir
directory argument to specify a directory. If any of these
databases already exist in a specified directory, modutil returns
an error message.
-default modulename
Specify the security mechanisms for which the named module will be
a default provider. The security mechanisms are specified with the
-mechanisms argument.
-delete modulename
Delete the named module. The default NSS PKCS #11 module cannot be
deleted.
-disable modulename
Disable all slots on the named module. Use the -slot argument to
disable a specific slot.
The internal NSS PKCS #11 module cannot be disabled.
-enable modulename
Enable all slots on the named module. Use the -slot argument to
enable a specific slot.
-fips [true | false]
Enable (true) or disable (false) FIPS 140-2 compliance for the
default NSS module.
-force
Disable modutil's interactive prompts so it can be run from a
script. Use this option only after manually testing each planned
operation to check for warnings and to ensure that bypassing the
prompts will cause no security lapses or loss of database
integrity.
-jar JAR-file
Add a new PKCS #11 module to the database using the named JAR file.
Use this command with the -installdir and -tempdir arguments. The
JAR file uses the NSS PKCS #11 JAR format to identify all the files
to be installed, the module's name, the mechanism flags, and the
cipher flags, as well as any files to be installed on the target
machine, including the PKCS #11 module library file and other files
such as documentation. This is covered in the JAR installation file
section in the man page, which details the special script needed to
perform an installation through a server or with modutil.
-list [modulename]
Display basic information about the contents of the secmod.db file.
Specifying a modulename displays detailed information about a
particular module and its slots and tokens.
-rawadd
Add the module spec string to the secmod.db database.
-rawlist
Display the module specs for a specified module or for all loadable
modules.
-undefault modulename
Specify the security mechanisms for which the named module will not
be a default provider. The security mechanisms are specified with
the -mechanisms argument.
Arguments
MODULE
Give the security module to access.
MODULESPEC
Give the security module spec to load into the security database.
-ciphers cipher-enable-list
Enable specific ciphers in a module that is being added to the
database. The cipher-enable-list is a colon-delimited list of
cipher names. Enclose this list in quotation marks if it contains
spaces.
-dbdir directory
Specify the database directory in which to access or create
security module database files.
modutil supports two types of databases: the legacy security
databases (cert8.db, key3.db, and secmod.db) and SQLite databases
(cert9.db, key4.db, and pkcs11.txt). If the prefix dbm: is not
used, then the tool assumes that the given databases are in SQLite
format.
--dbprefix prefix
Specify the prefix used on the database files, such as my_ for
my_cert9.db. This option is provided as a special case. Changing
the names of the certificate and key databases is not recommended.
-installdir root-installation-directory
Specify the root installation directory relative to which files
will be installed by the -jar option. This directory should be one
below which it is appropriate to store dynamic library files, such
as a server's root directory.
-libfile library-file
Specify a path to a library file containing the implementation of
the PKCS #11 interface module that is being added to the database.
-mechanisms mechanism-list
Specify the security mechanisms for which a particular module will
be flagged as a default provider. The mechanism-list is a
colon-delimited list of mechanism names. Enclose this list in
quotation marks if it contains spaces.
The module becomes a default provider for the listed mechanisms
when those mechanisms are enabled. If more than one module claims
to be a particular mechanism's default provider, that mechanism's
default provider is undefined.
modutil supports several mechanisms: RSA, DSA, RC2, RC4, RC5, AES,
DES, DH, SHA1, SHA256, SHA512, SSL, TLS, MD5, MD2, RANDOM (for
random number generation), and FRIENDLY (meaning certificates are
publicly readable).
-newpwfile new-password-file
Specify a text file containing a token's new or replacement
password so that a password can be entered automatically with the
-changepw option.
-nocertdb
Do not open the certificate or key databases. This has several
effects:
o With the -create command, only a module security file is
created; certificate and key databases are not created.
o With the -jar command, signatures on the JAR file are not
checked.
o With the -changepw command, the password on the NSS internal
module cannot be set or changed, since this password is stored
in the key database.
-pwfile old-password-file
Specify a text file containing a token's existing password so that
a password can be entered automatically when the -changepw option
is used to change passwords.
-secmod secmodname
Give the name of the security module database (like secmod.db) to
load.
-slot slotname
Specify a particular slot to be enabled or disabled with the
-enable or -disable options.
-string CONFIG_STRING
Pass a configuration string for the module being added to the
database.
-tempdir temporary-directory
Give a directory location where temporary files are created during
the installation by the -jar option. If no temporary directory is
specified, the current directory is used.
USAGE AND EXAMPLES
Creating Database Files
Before any operations can be performed, there must be a set of security
databases available. modutil can be used to create these files. The
only required argument is the database that where the databases will be
located.
modutil -create -dbdir directory
Adding a Cryptographic Module
Adding a PKCS #11 module means submitting a supporting library file,
enabling its ciphers, and setting default provider status for various
security mechanisms. This can be done by supplying all of the
information through modutil directly or by running a JAR file and
install script. For the most basic case, simply upload the library:
modutil -add modulename -libfile library-file [-ciphers cipher-enable-list] [-mechanisms mechanism-list]
For example:
modutil -dbdir /home/my/sharednssdb -add "Example PKCS #11 Module" -libfile "/tmp/crypto.so" -mechanisms RSA:DSA:RC2:RANDOM
Using database directory ...
Module "Example PKCS #11 Module" added to database.
Installing a Cryptographic Module from a JAR File
PKCS #11 modules can also be loaded using a JAR file, which contains
all of the required libraries and an installation script that describes
how to install the module. The JAR install script is described in more
detail in the section called "JAR INSTALLATION FILE FORMAT".
The JAR installation script defines the setup information for each
platform that the module can be installed on. For example:
Platforms {
Linux:5.4.08:x86 {
ModuleName { "Example PKCS #11 Module" }
ModuleFile { crypto.so }
DefaultMechanismFlags{0x0000}
CipherEnableFlags{0x0000}
Files {
crypto.so {
Path{ /tmp/crypto.so }
}
setup.sh {
Executable
Path{ /tmp/setup.sh }
}
}
}
Linux:6.0.0:x86 {
EquivalentPlatform { Linux:5.4.08:x86 }
}
}
Both the install script and the required libraries must be bundled in a
JAR file, which is specified with the -jar argument.
modutil -dbdir /home/mt"jar-install-filey/sharednssdb -jar install.jar -installdir /home/my/sharednssdb
This installation JAR file was signed by:
----------------------------------------------
**SUBJECT NAME**
C=US, ST=California, L=Mountain View, CN=Cryptorific Inc., OU=Digital ID
Class 3 - Netscape Object Signing, OU="www.verisign.com/repository/CPS
Incorp. by Ref.,LIAB.LTD(c)9 6", OU=www.verisign.com/CPS Incorp.by Ref
. LIABILITY LTD.(c)97 VeriSign, OU=VeriSign Object Signing CA - Class 3
Organization, OU="VeriSign, Inc.", O=VeriSign Trust Network **ISSUER
NAME**, OU=www.verisign.com/CPS Incorp.by Ref. LIABILITY LTD.(c)97
VeriSign, OU=VeriSign Object Signing CA - Class 3 Organization,
OU="VeriSign, Inc.", O=VeriSign Trust Network
----------------------------------------------
Do you wish to continue this installation? (y/n) y
Using installer script "installer_script"
Successfully parsed installation script
Current platform is Linux:5.4.08:x86
Using installation parameters for platform Linux:5.4.08:x86
Installed file crypto.so to /tmp/crypto.so
Installed file setup.sh to ./pk11inst.dir/setup.sh
Executing "./pk11inst.dir/setup.sh"...
"./pk11inst.dir/setup.sh" executed successfully
Installed module "Example PKCS #11 Module" into module database
Installation completed successfully
Adding Module Spec
Each module has information stored in the security database about its
configuration and parameters. These can be added or edited using the
-rawadd command. For the current settings or to see the format of the
module spec in the database, use the -rawlist option.
modutil -rawadd modulespec
Deleting a Module
A specific PKCS #11 module can be deleted from the secmod.db database:
modutil -delete modulename -dbdir directory
Displaying Module Information
The secmod.db database contains information about the PKCS #11 modules
that are available to an application or server to use. The list of all
modules, information about specific modules, and database configuration
specs for modules can all be viewed.
To simply get a list of modules in the database, use the -list command.
modutil -list [modulename] -dbdir directory
Listing the modules shows the module name, their status, and other
associated security databases for certificates and keys. For example:
modutil -list -dbdir /home/my/sharednssdb
Listing of PKCS #11 Modules
-----------------------------------------------------------
1. NSS Internal PKCS #11 Module
slots: 2 slots attached
status: loaded
slot: NSS Internal Cryptographic Services
token: NSS Generic Crypto Services
uri: pkcs11:token=NSS%20Generic%20Crypto%20Services;manufacturer=Mozilla%20Foundation;serial=0000000000000000;model=NSS%203
slot: NSS User Private Key and Certificate Services
token: NSS Certificate DB
uri: pkcs11:token=NSS%20Certificate%20DB;manufacturer=Mozilla%20Foundation;serial=0000000000000000;model=NSS%203
-----------------------------------------------------------
Passing a specific module name with the -list returns details
information about the module itself, like supported cipher mechanisms,
version numbers, serial numbers, and other information about the module
and the token it is loaded on. For example:
modutil -list "NSS Internal PKCS #11 Module" -dbdir /home/my/sharednssdb
-----------------------------------------------------------
Name: NSS Internal PKCS #11 Module
Library file: **Internal ONLY module**
Manufacturer: Mozilla Foundation
Description: NSS Internal Crypto Services
PKCS #11 Version 2.20
Library Version: 3.11
Cipher Enable Flags: None
Default Mechanism Flags: RSA:RC2:RC4:DES:DH:SHA1:MD5:MD2:SSL:TLS:AES
Slot: NSS Internal Cryptographic Services
Slot Mechanism Flags: RSA:RC2:RC4:DES:DH:SHA1:MD5:MD2:SSL:TLS:AES
Manufacturer: Mozilla Foundation
Type: Software
Version Number: 3.11
Firmware Version: 0.0
Status: Enabled
Token Name: NSS Generic Crypto Services
Token Manufacturer: Mozilla Foundation
Token Model: NSS 3
Token Serial Number: 0000000000000000
Token Version: 4.0
Token Firmware Version: 0.0
Access: Write Protected
Login Type: Public (no login required)
User Pin: NOT Initialized
Slot: NSS User Private Key and Certificate Services
Slot Mechanism Flags: None
Manufacturer: Mozilla Foundation
Type: Software
Version Number: 3.11
Firmware Version: 0.0
Status: Enabled
Token Name: NSS Certificate DB
Token Manufacturer: Mozilla Foundation
Token Model: NSS 3
Token Serial Number: 0000000000000000
Token Version: 8.3
Token Firmware Version: 0.0
Access: NOT Write Protected
Login Type: Login required
User Pin: Initialized
A related command, -rawlist returns information about the database
configuration for the modules. (This information can be edited by
loading new specs using the -rawadd command.)
modutil -rawlist -dbdir /home/my/sharednssdb
name="NSS Internal PKCS #11 Module" parameters="configdir=. certPrefix= keyPrefix= secmod=secmod.db flags=readOnly " NSS="trustOrder=75 cipherOrder=100 slotParams={0x00000001=[slotFlags=RSA,RC4,RC2,DES,DH,SHA1,MD5,MD2,SSL,TLS,AES,RANDOM askpw=any timeout=30 ] } Flags=internal,critical"
Setting a Default Provider for Security Mechanisms
Multiple security modules may provide support for the same security
mechanisms. It is possible to set a specific security module as the
default provider for a specific security mechanism (or, conversely, to
prohibit a provider from supplying those mechanisms).
modutil -default modulename -mechanisms mechanism-list
To set a module as the default provider for mechanisms, use the
-default command with a colon-separated list of mechanisms. The
available mechanisms depend on the module; NSS supplies almost all
common mechanisms. For example:
modutil -default "NSS Internal PKCS #11 Module" -dbdir -mechanisms RSA:DSA:RC2
Using database directory c:\databases...
Successfully changed defaults.
Clearing the default provider has the same format:
modutil -undefault "NSS Internal PKCS #11 Module" -dbdir -mechanisms MD2:MD5
Enabling and Disabling Modules and Slots
Modules, and specific slots on modules, can be selectively enabled or
disabled using modutil. Both commands have the same format:
modutil -enable|-disable modulename [-slot slotname]
For example:
modutil -enable "NSS Internal PKCS #11 Module" -slot "NSS Internal Cryptographic Services " -dbdir .
Slot "NSS Internal Cryptographic Services " enabled.
Be sure that the appropriate amount of trailing whitespace is after the
slot name. Some slot names have a significant amount of whitespace that
must be included, or the operation will fail.
Enabling and Verifying FIPS Compliance
The NSS modules can have FIPS 140-2 compliance enabled or disabled
using modutil with the -fips option. For example:
modutil -fips true -dbdir /home/my/sharednssdb/
FIPS mode enabled.
To verify that status of FIPS mode, run the -chkfips command with
either a true or false flag (it doesn't matter which). The tool returns
the current FIPS setting.
modutil -chkfips false -dbdir /home/my/sharednssdb/
FIPS mode enabled.
Changing the Password on a Token
Initializing or changing a token's password:
modutil -changepw tokenname [-pwfile old-password-file] [-newpwfile new-password-file]
modutil -dbdir /home/my/sharednssdb -changepw "NSS Certificate DB"
Enter old password:
Incorrect password, try again...
Enter old password:
Enter new password:
Re-enter new password:
Token "Communicator Certificate DB" password changed successfully.
JAR INSTALLATION FILE FORMAT
When a JAR file is run by a server, by modutil, or by any program that
does not interpret JavaScript, a special information file must be
included to install the libraries. There are several things to keep in
mind with this file:
o It must be declared in the JAR archive's manifest file.
o The script can have any name.
o The metainfo tag for this is Pkcs11_install_script. To declare
meta-information in the manifest file, put it in a file that is
passed to signtool.
Sample Script
For example, the PKCS #11 installer script could be in the file
pk11install. If so, the metainfo file for signtool includes a line such
as this:
+ Pkcs11_install_script: pk11install
The script must define the platform and version number, the module name
and file, and any optional information like supported ciphers and
mechanisms. Multiple platforms can be defined in a single install file.
ForwardCompatible { IRIX:6.2:mips SUNOS:5.5.1:sparc }
Platforms {
WINNT::x86 {
ModuleName { "Example Module" }
ModuleFile { win32/fort32.dll }
DefaultMechanismFlags{0x0001}
DefaultCipherFlags{0x0001}
Files {
win32/setup.exe {
Executable
RelativePath { %temp%/setup.exe }
}
win32/setup.hlp {
RelativePath { %temp%/setup.hlp }
}
win32/setup.cab {
RelativePath { %temp%/setup.cab }
}
}
}
WIN95::x86 {
EquivalentPlatform {WINNT::x86}
}
SUNOS:5.5.1:sparc {
ModuleName { "Example UNIX Module" }
ModuleFile { unix/fort.so }
DefaultMechanismFlags{0x0001}
CipherEnableFlags{0x0001}
Files {
unix/fort.so {
RelativePath{%root%/lib/fort.so}
AbsolutePath{/usr/local/netscape/lib/fort.so}
FilePermissions{555}
}
xplat/instr.html {
RelativePath{%root%/docs/inst.html}
AbsolutePath{/usr/local/netscape/docs/inst.html}
FilePermissions{555}
}
}
}
IRIX:6.2:mips {
EquivalentPlatform { SUNOS:5.5.1:sparc }
}
}
Script Grammar
The script is basic Java, allowing lists, key-value pairs, strings, and
combinations of all of them.
--> valuelist
valuelist --> value valuelist
<null>
value ---> key_value_pair
string
key_value_pair --> key { valuelist }
key --> string
string --> simple_string
"complex_string"
simple_string --> [^ \t\n\""{""}"]+
complex_string --> ([^\"\\\r\n]|(\\\")|(\\\\))+
Quotes and backslashes must be escaped with a backslash. A complex
string must not include newlines or carriage returns.Outside of complex
strings, all white space (for example, spaces, tabs, and carriage
returns) is considered equal and is used only to delimit tokens.
Keys
The Java install file uses keys to define the platform and module
information.
ForwardCompatible gives a list of platforms that are forward
compatible. If the current platform cannot be found in the list of
supported platforms, then the ForwardCompatible list is checked for any
platforms that have the same OS and architecture in an earlier version.
If one is found, its attributes are used for the current platform.
Platforms (required) Gives a list of platforms. Each entry in the list
is itself a key-value pair: the key is the name of the platform and the
value list contains various attributes of the platform. The platform
string is in the format system name:OS release:architecture. The
installer obtains these values from NSPR. OS release is an empty string
on non-Unix operating systems. NSPR supports these platforms:
o AIX (rs6000)
o BSDI (x86)
o FREEBSD (x86)
o HPUX (hppa1.1)
o IRIX (mips)
o LINUX (ppc, alpha, x86)
o MacOS (PowerPC)
o NCR (x86)
o NEC (mips)
o OS2 (x86)
o OSF (alpha)
o ReliantUNIX (mips)
o SCO (x86)
o SOLARIS (sparc)
o SONY (mips)
o SUNOS (sparc)
o UnixWare (x86)
o WIN16 (x86)
o WIN95 (x86)
o WINNT (x86)
For example:
IRIX:6.2:mips
SUNOS:5.5.1:sparc
Linux:2.0.32:x86
WIN95::x86
The module information is defined independently for each platform in
the ModuleName, ModuleFile, and Files attributes. These attributes must
be given unless an EquivalentPlatform attribute is specified.
Per-Platform Keys
Per-platform keys have meaning only within the value list of an entry
in the Platforms list.
ModuleName (required) gives the common name for the module. This name
is used to reference the module by servers and by the modutil tool.
ModuleFile (required) names the PKCS #11 module file for this platform.
The name is given as the relative path of the file within the JAR
archive.
Files (required) lists the files that need to be installed for this
module. Each entry in the file list is a key-value pair. The key is the
path of the file in the JAR archive, and the value list contains
attributes of the file. At least RelativePath or AbsolutePath must be
specified for each file.
DefaultMechanismFlags specifies mechanisms for which this module is the
default provider; this is equivalent to the -mechanism option with the
-add command. This key-value pair is a bitstring specified in
hexadecimal (0x) format. It is constructed as a bitwise OR. If the
DefaultMechanismFlags entry is omitted, the value defaults to 0x0.
RSA: 0x00000001
DSA: 0x00000002
RC2: 0x00000004
RC4: 0x00000008
DES: 0x00000010
DH: 0x00000020
FORTEZZA: 0x00000040
RC5: 0x00000080
SHA1: 0x00000100
MD5: 0x00000200
MD2: 0x00000400
RANDOM: 0x08000000
FRIENDLY: 0x10000000
OWN_PW_DEFAULTS: 0x20000000
DISABLE: 0x40000000
CipherEnableFlags specifies ciphers that this module provides that NSS
does not provide (so that the module enables those ciphers for NSS).
This is equivalent to the -cipher argument with the -add command. This
key is a bitstring specified in hexadecimal (0x) format. It is
constructed as a bitwise OR. If the CipherEnableFlags entry is omitted,
the value defaults to 0x0.
EquivalentPlatform specifies that the attributes of the named platform
should also be used for the current platform. This makes it easier when
more than one platform uses the same settings.
Per-File Keys
Some keys have meaning only within the value list of an entry in a
Files list.
Each file requires a path key the identifies where the file is. Either
RelativePath or AbsolutePath must be specified. If both are specified,
the relative path is tried first, and the absolute path is used only if
no relative root directory is provided by the installer program.
RelativePath specifies the destination directory of the file, relative
to some directory decided at install time. Two variables can be used in
the relative path: %root% and %temp%. %root% is replaced at run time
with the directory relative to which files should be installed; for
example, it may be the server's root directory. The %temp% directory is
created at the beginning of the installation and destroyed at the end.
The purpose of %temp% is to hold executable files (such as setup
programs) or files that are used by these programs. Files destined for
the temporary directory are guaranteed to be in place before any
executable file is run; they are not deleted until all executable files
have finished.
AbsolutePath specifies the destination directory of the file as an
absolute path.
Executable specifies that the file is to be executed during the course
of the installation. Typically, this string is used for a setup program
provided by a module vendor, such as a self-extracting setup
executable. More than one file can be specified as executable, in which
case the files are run in the order in which they are specified in the
script file.
FilePermissions sets permissions on any referenced files in a string of
octal digits, according to the standard Unix format. This string is a
bitwise OR.
user read: 0400
user write: 0200
user execute: 0100
group read: 0040
group write: 0020
group execute: 0010
other read: 0004
other write: 0002
other execute: 0001
Some platforms may not understand these permissions. They are applied
only insofar as they make sense for the current platform. If this
attribute is omitted, a default of 777 is assumed.
NSS DATABASE TYPES
NSS originally used BerkeleyDB databases to store security information.
The last versions of these legacy databases are:
o cert8.db for certificates
o key3.db for keys
o secmod.db for PKCS #11 module information
BerkeleyDB has performance limitations, though, which prevent it from
being easily used by multiple applications simultaneously. NSS has some
flexibility that allows applications to use their own, independent
database engine while keeping a shared database and working around the
access issues. Still, NSS requires more flexibility to provide a truly
shared security database.
In 2009, NSS introduced a new set of databases that are SQLite
databases rather than BerkleyDB. These new databases provide more
accessibility and performance:
o cert9.db for certificates
o key4.db for keys
o pkcs11.txt, which is listing of all of the PKCS #11 modules
contained in a new subdirectory in the security databases directory
Because the SQLite databases are designed to be shared, these are the
shared database type. The shared database type is preferred; the legacy
format is included for backward compatibility.
By default, the tools (certutil, pk12util, modutil) assume that the
given security databases use the SQLite type. Using the legacy
databases must be manually specified by using the dbm: prefix with the
given security directory. For example:
modutil -create -dbdir dbm:/home/my/sharednssdb
To set the legacy database type as the default type for the tools, set
the NSS_DEFAULT_DB_TYPE environment variable to dbm:
export NSS_DEFAULT_DB_TYPE="dbm"
This line can be added to the ~/.bashrc file to make the change
permanent for the user.
o https://wiki.mozilla.org/NSS_Shared_DB_Howto
For an engineering draft on the changes in the shared NSS databases,
see the NSS project wiki:
o https://wiki.mozilla.org/NSS_Shared_DB
SEE ALSO
certutil (1)
pk12util (1)
signtool (1)
The NSS wiki has information on the new database design and how to
configure applications to use it.
o https://wiki.mozilla.org/NSS_Shared_DB_Howto
o https://wiki.mozilla.org/NSS_Shared_DB
ADDITIONAL RESOURCES
For information about NSS and other tools related to NSS (like JSS),
check out the NSS project wiki at
http://www.mozilla.org/projects/security/pki/nss/. The NSS site relates
directly to NSS code changes and releases.
Mailing lists: https://lists.mozilla.org/listinfo/dev-tech-crypto
IRC: Freenode at #dogtag-pki
AUTHORS
The NSS tools were written and maintained by developers with Netscape,
Red Hat, Sun, Oracle, Mozilla, and Google.
Authors: Elio Maldonado <emaldona AT redhat.com>, Deon Lackey
<dlackey AT redhat.com>.
LICENSE
Licensed under the Mozilla Public License, v. 2.0. If a copy of the MPL
was not distributed with this file, You can obtain one at
http://mozilla.org/MPL/2.0/.
NOTES
1. Mozilla NSS bug 836477
https://bugzilla.mozilla.org/show_bug.cgi?id=836477
nss-tools 3.101.0 Nov 13 2013 MODUTIL(1)
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