.\" $OpenBSD: CONF_modules_load_file.3,v 1.11 2023/07/21 10:46:54 tb 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 .\" .\" 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. 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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: July 21 2023 $ .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 .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(); ENGINE_load_builtin_engines(); OPENSSL_load_builtin_modules(); 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, and the calls to .Xr ENGINE_load_builtin_engines 3 and .Xr OPENSSL_load_builtin_modules 3 are needed so that the configuration of builtin modules and engines is also loaded in addition to the configuration of .Qq myapp . .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 ENGINE_load_builtin_engines 3 , .Xr ERR 3 , .Xr OPENSSL_config 3 , .Xr OPENSSL_load_builtin_modules 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 .