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CONFIG(5)                           OpenSSL                          CONFIG(5)

       config - OpenSSL CONF library configuration files

       The OpenSSL CONF library can be used to read configuration files.  It is used for
       the OpenSSL master configuration file openssl.cnf and in a few other places like
       SPKAC files and certificate extension files for the x509 utility. OpenSSL
       applications can also use the CONF library for their own purposes.

       A configuration file is divided into a number of sections. Each section starts with
       a line [ section_name ] and ends when a new section is started or end of file is
       reached. A section name can consist of alphanumeric characters and underscores.

       The first section of a configuration file is special and is referred to as the
       default section this is usually unnamed and is from the start of file until the
       first named section. When a name is being looked up it is first looked up in a
       named section (if any) and then the default section.

       The environment is mapped onto a section called ENV.

       Comments can be included by preceding them with the # character

       Each section in a configuration file consists of a number of name and value pairs
       of the form name=value

       The name string can contain any alphanumeric characters as well as a few
       punctuation symbols such as . , ; and _.

       The value string consists of the string following the = character until end of line
       with any leading and trailing white space removed.

       The value string undergoes variable expansion. This can be done by including the
       form $var or ${var}: this will substitute the value of the named variable in the
       current section. It is also possible to substitute a value from another section
       using the syntax $section::name or ${section::name}. By using the form $ENV::name
       environment variables can be substituted. It is also possible to assign values to
       environment variables by using the name ENV::name, this will work if the program
       looks up environment variables using the CONF library instead of calling getenv()

       It is possible to escape certain characters by using any kind of quote or the \
       character. By making the last character of a line a \ a value string can be spread
       across multiple lines. In addition the sequences \n, \r, \b and \t are recognized.

       In OpenSSL 0.9.7 and later applications can automatically configure certain aspects
       of OpenSSL using the master OpenSSL configuration file, or optionally an
       alternative configuration file. The openssl utility includes this functionality:
       any sub command uses the master OpenSSL configuration file unless an option is used
       in the sub command to use an alternative configuration file.

       To enable library configuration the default section needs to contain an appropriate
       line which points to the main configuration section. The default name is
       openssl_conf which is used by the openssl utility. Other applications may use an
       alternative name such as myapplicaton_conf.

       The configuration section should consist of a set of name value pairs which contain
       specific module configuration information. The name represents the name of the
       configuration module the meaning of the value is module specific: it may, for
       example, represent a further configuration section containing configuration module
       specific information. E.g.

        openssl_conf = openssl_init


        oid_section = new_oids
        engines = engine_section


        ... new oids here ...


        ... engine stuff here ...

       Currently there are two configuration modules. One for ASN1 objects another for
       ENGINE configuration.

       This module has the name oid_section. The value of this variable points to a
       section containing name value pairs of OIDs: the name is the OID short and long
       name, the value is the numerical form of the OID. Although some of the openssl
       utility sub commands already have their own ASN1 OBJECT section functionality not
       all do. By using the ASN1 OBJECT configuration module all the openssl utility sub
       commands can see the new objects as well as any compliant applications. For


        some_new_oid =
        some_other_oid =

       In OpenSSL 0.9.8 it is also possible to set the value to the long name followed by
       a comma and the numerical OID form. For example:

        shortName = some object long name,

       This ENGINE configuration module has the name engines. The value of this variable
       points to a section containing further ENGINE configuration information.

       The section pointed to by engines is a table of engine names (though see engine_id
       below) and further sections containing configuration informations specific to each

       Each ENGINE specific section is used to set default algorithms, load dynamic,
       perform initialization and send ctrls. The actual operation performed depends on
       the command name which is the name of the name value pair. The currently supported
       commands are listed below.

       For example:


        # Configure ENGINE named "foo"
        foo = foo_section
        # Configure ENGINE named "bar"
        bar = bar_section

        ... foo ENGINE specific commands ...

        ... "bar" ENGINE specific commands ...

       The command engine_id is used to give the ENGINE name. If used this command must be
       first. For example:

        # This would normally handle an ENGINE named "foo"
        foo = foo_section

        # Override default name and use "myfoo" instead.
        engine_id = myfoo

       The command dynamic_path loads and adds an ENGINE from the given path. It is
       equivalent to sending the ctrls SO_PATH with the path argument followed by LIST_ADD
       with value 2 and LOAD to the dynamic ENGINE. If this is not the required behaviour
       then alternative ctrls can be sent directly to the dynamic ENGINE using ctrl

       The command init determines whether to initialize the ENGINE. If the value is 0 the
       ENGINE will not be initialized, if 1 and attempt it made to initialized the ENGINE
       immediately. If the init command is not present then an attempt will be made to
       initialize the ENGINE after all commands in its section have been processed.

       The command default_algorithms sets the default algorithms an ENGINE will supply
       using the functions ENGINE_set_default_string()

       If the name matches none of the above command names it is assumed to be a ctrl
       command which is sent to the ENGINE. The value of the command is the argument to
       the ctrl command. If the value is the string EMPTY then no value is sent to the

       For example:


        # Configure ENGINE named "foo"
        foo = foo_section

        # Load engine from DSO
        dynamic_path = /some/path/
        # A foo specific ctrl.
        some_ctrl = some_value
        # Another ctrl that doesn't take a value.
        other_ctrl = EMPTY
        # Supply all default algorithms
        default_algorithms = ALL

       If a configuration file attempts to expand a variable that doesn't exist then an
       error is flagged and the file will not load. This can happen if an attempt is made
       to expand an environment variable that doesn't exist. For example in a previous
       version of OpenSSL the default OpenSSL master configuration file used the value of
       HOME which may not be defined on non Unix systems and would cause an error.

       This can be worked around by including a default section to provide a default
       value: then if the environment lookup fails the default value will be used instead.
       For this to work properly the default value must be defined earlier in the
       configuration file than the expansion. See the EXAMPLES section for an example of
       how to do this.

       If the same variable exists in the same section then all but the last value will be
       silently ignored. In certain circumstances such as with DNs the same field may
       occur multiple times. This is usually worked around by ignoring any characters
       before an initial . e.g.

        1.OU="My first OU"
        2.OU="My Second OU"

       Here is a sample configuration file using some of the features mentioned above.

        # This is the default section.

        RANDFILE= ${ENV::HOME}/.rnd

        [ section_one ]

        # We are now in section one.

        # Quotes permit leading and trailing whitespace
        any = " any variable name "

        other = A string that can \
        cover several lines \
        by including \\ characters

        message = Hello World\n

        [ section_two ]

        greeting = $section_one::message

       This next example shows how to expand environment variables safely.

       Suppose you want a variable called tmpfile to refer to a temporary filename. The
       directory it is placed in can determined by the the TEMP or TMP environment
       variables but they may not be set to any value at all. If you just include the
       environment variable names and the variable doesn't exist then this will cause an
       error when an attempt is made to load the configuration file. By making use of the
       default section both values can be looked up with TEMP taking priority and /tmp
       used if neither is defined:

        # The above value is used if TMP isn't in the environment
        # The above value is used if TEMP isn't in the environment

       Currently there is no way to include characters using the octal \nnn form. Strings
       are all null terminated so nulls cannot form part of the value.

       The escaping isn't quite right: if you want to use sequences like \n you can't use
       any quote escaping on the same line.

       Files are loaded in a single pass. This means that an variable expansion will only
       work if the variables referenced are defined earlier in the file.

       x509(1), req(1), ca(1)

1.0.1e                            2013-02-11                         CONFIG(5)

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