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+.\" $OpenBSD: CONF_modules_load_file.3,v 1.16 2025/06/09 12:43:53 schwarze Exp $
+.\" full merge up to: e9b77246 Jan 20 19:58:49 2017 +0100
+.\" selective merge up to: d090fc00 Feb 26 13:11:10 2019 +0800
+.\"
+.\" This file is a derived work.
+.\" The changes are covered by the following Copyright and license:
+.\"
+.\" Copyright (c) 2021 Ingo Schwarze <schwarze@openbsd.org>
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.\" The original file was written by Dr. Stephen Henson <steve@openssl.org>.
+.\" Copyright (c) 2000, 2015 The OpenSSL Project.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\"
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\"
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in
+.\"    the documentation and/or other materials provided with the
+.\"    distribution.
+.\"
+.\" 3. All advertising materials mentioning features or use of this
+.\"    software must display the following acknowledgment:
+.\"    "This product includes software developed by the OpenSSL Project
+.\"    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
+.\"
+.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+.\"    endorse or promote products derived from this software without
+.\"    prior written permission. For written permission, please contact
+.\"    openssl-core@openssl.org.
+.\"
+.\" 5. Products derived from this software may not be called "OpenSSL"
+.\"    nor may "OpenSSL" appear in their names without prior written
+.\"    permission of the OpenSSL Project.
+.\"
+.\" 6. Redistributions of any form whatsoever must retain the following
+.\"    acknowledgment:
+.\"    "This product includes software developed by the OpenSSL Project
+.\"    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+.\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+.\" OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd $Mdocdate: June 9 2025 $
+.Dt CONF_MODULES_LOAD_FILE 3
+.Os
+.Sh NAME
+.Nm CONF_modules_load_file ,
+.Nm CONF_modules_load ,
+.Nm X509_get_default_cert_area
+.Nd OpenSSL configuration functions
+.Sh SYNOPSIS
+.Lb libcrypto
+.In openssl/conf.h
+.Ft int
+.Fo CONF_modules_load_file
+.Fa "const char *filename"
+.Fa "const char *appname"
+.Fa "unsigned long flags"
+.Fc
+.Ft int
+.Fo CONF_modules_load
+.Fa "const CONF *cnf"
+.Fa "const char *appname"
+.Fa "unsigned long flags"
+.Fc
+.In openssl/x509.h
+.Ft const char *
+.Fn X509_get_default_cert_area void
+.Sh DESCRIPTION
+The function
+.Fn CONF_modules_load_file
+configures OpenSSL using the file
+.Fa filename
+in
+.Xr openssl.cnf 5
+format and the application name
+.Fa appname .
+If
+.Fa filename
+is
+.Dv NULL ,
+the standard OpenSSL configuration file
+.Pa /etc/ssl/openssl.cnf
+is used.
+If
+.Fa appname
+is
+.Dv NULL ,
+the standard OpenSSL application name
+.Qq openssl_conf
+is used.
+The behaviour can be customized using
+.Fa flags .
+.Pp
+See the
+.Sx EXAMPLES
+section for additional functions that may need to be called.
+Calling configuration functions in the right order for the intended
+effect can be tricky because many configuration functions internally
+call each other.
+.Pp
+.Fn CONF_modules_load
+is identical to
+.Fn CONF_modules_load_file
+except it reads configuration information from
+.Fa cnf .
+.Pp
+The following
+.Fa flags
+are currently recognized:
+.Bl -tag -width Ds
+.It Dv CONF_MFLAGS_IGNORE_ERRORS
+Ignore errors returned by individual configuration modules.
+By default, the first module error is considered fatal and no further
+modules are loaded.
+.It Dv CONF_MFLAGS_SILENT
+Do not add any error information.
+By default, all module errors add error information to the error queue.
+.It Dv CONF_MFLAGS_NO_DSO
+Disable loading of configuration modules from DSOs.
+This flag is provided for compatibility and has no effect.
+.It Dv CONF_MFLAGS_IGNORE_MISSING_FILE
+Let
+.Fn CONF_modules_load_file
+ignore missing configuration files.
+By default, a missing configuration file returns an error.
+.It CONF_MFLAGS_DEFAULT_SECTION
+If
+.Fa appname
+is not
+.Dv NULL
+but does not exist, fall back to the default section
+.Qq openssl_conf .
+.El
+.Pp
+By using
+.Fn CONF_modules_load_file
+with appropriate flags, an application can customise application
+configuration to best suit its needs.
+In some cases the use of a configuration file is optional and its
+absence is not an error: in this case
+.Dv CONF_MFLAGS_IGNORE_MISSING_FILE
+would be set.
+.Pp
+Errors during configuration may also be handled differently by
+different applications.
+For example in some cases an error may simply print out a warning
+message and the application may continue.
+In other cases an application might consider a configuration file
+error fatal and exit immediately.
+.Pp
+Applications can use the
+.Fn CONF_modules_load
+function if they wish to load a configuration file themselves and
+have finer control over how errors are treated.
+.Sh RETURN VALUES
+.Fn CONF_modules_load_file
+and
+.Fn CONF_modules_load
+return 1 for success and zero or a negative value for failure.
+If module errors are not ignored, the return code will reflect the return
+value of the failing module (this will always be zero or negative).
+.Pp
+.Fn X509_get_default_cert_area
+returns a pointer to the constant string
+.Qq "/etc/ssl" .
+.Sh FILES
+.Bl -tag -width /etc/ssl/openssl.cnf -compact
+.It Pa /etc/ssl
+standard configuration directory
+.It Pa /etc/ssl/openssl.cnf
+standard configuration file
+.El
+.Sh EXAMPLES
+Load a configuration file and print out any errors and exit (missing
+file considered fatal):
+.Bd -literal
+if (CONF_modules_load_file(NULL, NULL, 0) <= 0) {
+	fprintf(stderr, "FATAL: error loading configuration file\en");
+	ERR_print_errors_fp(stderr);
+	exit(1);
+}
+.Ed
+.Pp
+Load default configuration file using the section indicated
+by "myapp", tolerate missing files, but exit on other errors:
+.Bd -literal
+if (CONF_modules_load_file(NULL, "myapp",
+    CONF_MFLAGS_IGNORE_MISSING_FILE) <= 0) {
+	fprintf(stderr, "FATAL: error loading configuration file\en");
+	ERR_print_errors_fp(stderr);
+	exit(1);
+}
+.Ed
+.Pp
+Load custom configuration file and section instead of the standard one,
+only print warnings on error, missing configuration file ignored:
+.Bd -literal
+OPENSSL_no_config();
+if (CONF_modules_load_file("/something/app.cnf", "myapp",
+    CONF_MFLAGS_IGNORE_MISSING_FILE) <= 0) {
+	fprintf(stderr, "WARNING: error loading configuration file\en");
+	ERR_print_errors_fp(stderr);
+}
+.Ed
+.Pp
+In the previous example, the call to
+.Xr OPENSSL_no_config 3
+is required first to suppress automatic loading
+of the standard configuration file.
+.Pp
+Load and parse configuration file manually, custom error handling:
+.Bd -literal
+FILE	*fp;
+CONF	*cnf = NULL;
+long	 eline;
+
+fp = fopen("/somepath/app.cnf", "r");
+if (fp == NULL) {
+	fprintf(stderr, "Error opening configuration file\en");
+	/* Other missing configuration file behaviour */
+} else {
+	cnf = NCONF_new(NULL);
+	if (NCONF_load_fp(cnf, fp, &eline) == 0) {
+		fprintf(stderr, "Error on line %ld of configuration file\en",
+		    eline);
+		ERR_print_errors_fp(stderr);
+		/* Other malformed configuration file behaviour */
+	} else if (CONF_modules_load(cnf, "appname", 0) <= 0) {
+		fprintf(stderr, "Error configuring application\en");
+		ERR_print_errors_fp(stderr);
+		/* Other configuration error behaviour */
+	}
+	fclose(fp);
+	NCONF_free(cnf);
+}
+.Ed
+.Sh SEE ALSO
+.Xr CONF_modules_free 3 ,
+.Xr ERR 3 ,
+.Xr OPENSSL_config 3
+.Sh HISTORY
+.Fn X509_get_default_cert_area
+first appeared in SSLeay 0.4.1 and has been available since
+.Ox 2.4 .
+.Pp
+.Fn CONF_modules_load_file
+and
+.Fn CONF_modules_load
+first appeared in OpenSSL 0.9.7 and have been available since
+.Ox 3.2 .