145 lines
5.1 KiB
Plaintext
145 lines
5.1 KiB
Plaintext
=pod
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=head1 NAME
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CONF_modules_load_file, CONF_modules_load - OpenSSL configuration functions
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=head1 SYNOPSIS
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#include <openssl/conf.h>
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int CONF_modules_load_file(const char *filename, const char *appname,
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unsigned long flags);
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int CONF_modules_load(const CONF *cnf, const char *appname,
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unsigned long flags);
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=head1 DESCRIPTION
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The function CONF_modules_load_file() configures OpenSSL using file
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B<filename> and application name B<appname>. If B<filename> is NULL
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the standard OpenSSL configuration file is used. If B<appname> is
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NULL the standard OpenSSL application name B<openssl_conf> is used.
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The behaviour can be customized using B<flags>.
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CONF_modules_load() is identical to CONF_modules_load_file() except it
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reads configuration information from B<cnf>.
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=head1 NOTES
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The following B<flags> are currently recognized:
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If B<CONF_MFLAGS_IGNORE_ERRORS> is set errors returned by individual
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configuration modules are ignored. If not set the first module error is
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considered fatal and no further modules are loaded.
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Normally any modules errors will add error information to the error queue. If
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B<CONF_MFLAGS_SILENT> is set no error information is added.
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If B<CONF_MFLAGS_IGNORE_RETURN_CODES> is set the function unconditionally
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returns success.
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This is used by default in L<OPENSSL_init_crypto(3)> to ignore any errors in
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the default system-wide configuration file, as having all OpenSSL applications
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fail to start when there are potentially minor issues in the file is too risky.
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Applications calling B<CONF_modules_load_file> explicitly should not generally
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set this flag.
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If B<CONF_MFLAGS_NO_DSO> is set configuration module loading from DSOs is
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disabled.
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B<CONF_MFLAGS_IGNORE_MISSING_FILE> if set will make CONF_load_modules_file()
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ignore missing configuration files. Normally a missing configuration file
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return an error.
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B<CONF_MFLAGS_DEFAULT_SECTION> if set and B<appname> is not NULL will use the
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default section pointed to by B<openssl_conf> if B<appname> does not exist.
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By using CONF_modules_load_file() with appropriate flags an application can
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customise application configuration to best suit its needs. In some cases the
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use of a configuration file is optional and its absence is not an error: in
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this case B<CONF_MFLAGS_IGNORE_MISSING_FILE> would be set.
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Errors during configuration may also be handled differently by different
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applications. For example in some cases an error may simply print out a warning
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message and the application continue. In other cases an application might
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consider a configuration file error as fatal and exit immediately.
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Applications can use the CONF_modules_load() function if they wish to load a
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configuration file themselves and have finer control over how errors are
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treated.
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=head1 RETURN VALUES
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These functions return 1 for success and a zero or negative value for
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failure. If module errors are not ignored the return code will reflect the
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return value of the failing module (this will always be zero or negative).
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=head1 EXAMPLES
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Load a configuration file and print out any errors and exit (missing file
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considered fatal):
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if (CONF_modules_load_file(NULL, NULL, 0) <= 0) {
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fprintf(stderr, "FATAL: error loading configuration file\n");
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ERR_print_errors_fp(stderr);
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exit(1);
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}
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Load default configuration file using the section indicated by "myapp",
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tolerate missing files, but exit on other errors:
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if (CONF_modules_load_file(NULL, "myapp",
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CONF_MFLAGS_IGNORE_MISSING_FILE) <= 0) {
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fprintf(stderr, "FATAL: error loading configuration file\n");
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ERR_print_errors_fp(stderr);
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exit(1);
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}
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Load custom configuration file and section, only print warnings on error,
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missing configuration file ignored:
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if (CONF_modules_load_file("/something/app.cnf", "myapp",
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CONF_MFLAGS_IGNORE_MISSING_FILE) <= 0) {
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fprintf(stderr, "WARNING: error loading configuration file\n");
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ERR_print_errors_fp(stderr);
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}
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Load and parse configuration file manually, custom error handling:
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FILE *fp;
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CONF *cnf = NULL;
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long eline;
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fp = fopen("/somepath/app.cnf", "r");
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if (fp == NULL) {
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fprintf(stderr, "Error opening configuration file\n");
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/* Other missing configuration file behaviour */
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} else {
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cnf = NCONF_new(NULL);
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if (NCONF_load_fp(cnf, fp, &eline) == 0) {
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fprintf(stderr, "Error on line %ld of configuration file\n", eline);
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ERR_print_errors_fp(stderr);
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/* Other malformed configuration file behaviour */
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} else if (CONF_modules_load(cnf, "appname", 0) <= 0) {
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fprintf(stderr, "Error configuring application\n");
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ERR_print_errors_fp(stderr);
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/* Other configuration error behaviour */
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}
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fclose(fp);
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NCONF_free(cnf);
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}
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=head1 SEE ALSO
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L<config(5)>, L<OPENSSL_config(3)>
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=head1 COPYRIGHT
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Copyright 2004-2019 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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