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551 lines
13 KiB
C
551 lines
13 KiB
C
/*
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* Copyright 2002-2019 The OpenSSL Project Authors. All Rights Reserved.
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*
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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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* https://www.openssl.org/source/license.html
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*/
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#include "internal/cryptlib.h"
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#include <stdio.h>
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#include <ctype.h>
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#include <openssl/crypto.h>
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#include "internal/conf.h"
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#include "internal/dso.h"
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#include <openssl/x509.h>
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#define DSO_mod_init_name "OPENSSL_init"
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#define DSO_mod_finish_name "OPENSSL_finish"
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/*
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* This structure contains a data about supported modules. entries in this
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* table correspond to either dynamic or static modules.
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*/
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struct conf_module_st {
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/* DSO of this module or NULL if static */
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DSO *dso;
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/* Name of the module */
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char *name;
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/* Init function */
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conf_init_func *init;
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/* Finish function */
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conf_finish_func *finish;
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/* Number of successfully initialized modules */
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int links;
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void *usr_data;
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};
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/*
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* This structure contains information about modules that have been
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* successfully initialized. There may be more than one entry for a given
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* module.
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*/
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struct conf_imodule_st {
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CONF_MODULE *pmod;
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char *name;
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char *value;
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unsigned long flags;
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void *usr_data;
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};
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static STACK_OF(CONF_MODULE) *supported_modules = NULL;
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static STACK_OF(CONF_IMODULE) *initialized_modules = NULL;
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static void module_free(CONF_MODULE *md);
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static void module_finish(CONF_IMODULE *imod);
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static int module_run(const CONF *cnf, const char *name, const char *value,
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unsigned long flags);
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static CONF_MODULE *module_add(DSO *dso, const char *name,
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conf_init_func *ifunc,
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conf_finish_func *ffunc);
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static CONF_MODULE *module_find(const char *name);
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static int module_init(CONF_MODULE *pmod, const char *name, const char *value,
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const CONF *cnf);
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static CONF_MODULE *module_load_dso(const CONF *cnf, const char *name,
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const char *value);
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/* Main function: load modules from a CONF structure */
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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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{
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STACK_OF(CONF_VALUE) *values;
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CONF_VALUE *vl;
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char *vsection = NULL;
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int ret, i;
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if (!cnf)
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return 1;
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if (appname)
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vsection = NCONF_get_string(cnf, NULL, appname);
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if (!appname || (!vsection && (flags & CONF_MFLAGS_DEFAULT_SECTION)))
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vsection = NCONF_get_string(cnf, NULL, "openssl_conf");
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if (!vsection) {
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ERR_clear_error();
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return 1;
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}
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values = NCONF_get_section(cnf, vsection);
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if (!values)
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return 0;
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for (i = 0; i < sk_CONF_VALUE_num(values); i++) {
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vl = sk_CONF_VALUE_value(values, i);
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ret = module_run(cnf, vl->name, vl->value, flags);
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if (ret <= 0)
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if (!(flags & CONF_MFLAGS_IGNORE_ERRORS))
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return ret;
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}
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return 1;
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}
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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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{
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char *file = NULL;
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CONF *conf = NULL;
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int ret = 0;
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conf = NCONF_new(NULL);
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if (conf == NULL)
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goto err;
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if (filename == NULL) {
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file = CONF_get1_default_config_file();
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if (!file)
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goto err;
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} else
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file = (char *)filename;
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if (NCONF_load(conf, file, NULL) <= 0) {
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if ((flags & CONF_MFLAGS_IGNORE_MISSING_FILE) &&
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(ERR_GET_REASON(ERR_peek_last_error()) == CONF_R_NO_SUCH_FILE)) {
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ERR_clear_error();
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ret = 1;
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}
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goto err;
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}
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ret = CONF_modules_load(conf, appname, flags);
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err:
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if (filename == NULL)
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OPENSSL_free(file);
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NCONF_free(conf);
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if (flags & CONF_MFLAGS_IGNORE_RETURN_CODES)
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return 1;
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return ret;
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}
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static int module_run(const CONF *cnf, const char *name, const char *value,
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unsigned long flags)
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{
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CONF_MODULE *md;
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int ret;
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md = module_find(name);
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/* Module not found: try to load DSO */
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if (!md && !(flags & CONF_MFLAGS_NO_DSO))
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md = module_load_dso(cnf, name, value);
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if (!md) {
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if (!(flags & CONF_MFLAGS_SILENT)) {
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CONFerr(CONF_F_MODULE_RUN, CONF_R_UNKNOWN_MODULE_NAME);
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ERR_add_error_data(2, "module=", name);
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}
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return -1;
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}
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ret = module_init(md, name, value, cnf);
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if (ret <= 0) {
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if (!(flags & CONF_MFLAGS_SILENT)) {
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char rcode[DECIMAL_SIZE(ret) + 1];
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CONFerr(CONF_F_MODULE_RUN, CONF_R_MODULE_INITIALIZATION_ERROR);
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BIO_snprintf(rcode, sizeof(rcode), "%-8d", ret);
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ERR_add_error_data(6, "module=", name, ", value=", value,
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", retcode=", rcode);
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}
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}
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return ret;
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}
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/* Load a module from a DSO */
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static CONF_MODULE *module_load_dso(const CONF *cnf,
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const char *name, const char *value)
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{
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DSO *dso = NULL;
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conf_init_func *ifunc;
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conf_finish_func *ffunc;
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const char *path = NULL;
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int errcode = 0;
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CONF_MODULE *md;
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/* Look for alternative path in module section */
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path = NCONF_get_string(cnf, value, "path");
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if (!path) {
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ERR_clear_error();
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path = name;
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}
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dso = DSO_load(NULL, path, NULL, 0);
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if (!dso) {
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errcode = CONF_R_ERROR_LOADING_DSO;
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goto err;
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}
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ifunc = (conf_init_func *)DSO_bind_func(dso, DSO_mod_init_name);
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if (!ifunc) {
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errcode = CONF_R_MISSING_INIT_FUNCTION;
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goto err;
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}
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ffunc = (conf_finish_func *)DSO_bind_func(dso, DSO_mod_finish_name);
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/* All OK, add module */
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md = module_add(dso, name, ifunc, ffunc);
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if (!md)
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goto err;
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return md;
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err:
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DSO_free(dso);
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CONFerr(CONF_F_MODULE_LOAD_DSO, errcode);
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ERR_add_error_data(4, "module=", name, ", path=", path);
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return NULL;
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}
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/* add module to list */
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static CONF_MODULE *module_add(DSO *dso, const char *name,
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conf_init_func *ifunc, conf_finish_func *ffunc)
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{
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CONF_MODULE *tmod = NULL;
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if (supported_modules == NULL)
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supported_modules = sk_CONF_MODULE_new_null();
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if (supported_modules == NULL)
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return NULL;
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if ((tmod = OPENSSL_zalloc(sizeof(*tmod))) == NULL) {
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CONFerr(CONF_F_MODULE_ADD, ERR_R_MALLOC_FAILURE);
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return NULL;
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}
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tmod->dso = dso;
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tmod->name = OPENSSL_strdup(name);
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tmod->init = ifunc;
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tmod->finish = ffunc;
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if (tmod->name == NULL) {
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OPENSSL_free(tmod);
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return NULL;
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}
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if (!sk_CONF_MODULE_push(supported_modules, tmod)) {
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OPENSSL_free(tmod->name);
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OPENSSL_free(tmod);
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return NULL;
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}
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return tmod;
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}
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/*
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* Find a module from the list. We allow module names of the form
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* modname.XXXX to just search for modname to allow the same module to be
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* initialized more than once.
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*/
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static CONF_MODULE *module_find(const char *name)
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{
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CONF_MODULE *tmod;
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int i, nchar;
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char *p;
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p = strrchr(name, '.');
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if (p)
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nchar = p - name;
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else
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nchar = strlen(name);
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for (i = 0; i < sk_CONF_MODULE_num(supported_modules); i++) {
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tmod = sk_CONF_MODULE_value(supported_modules, i);
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if (strncmp(tmod->name, name, nchar) == 0)
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return tmod;
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}
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return NULL;
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}
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/* initialize a module */
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static int module_init(CONF_MODULE *pmod, const char *name, const char *value,
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const CONF *cnf)
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{
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int ret = 1;
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int init_called = 0;
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CONF_IMODULE *imod = NULL;
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/* Otherwise add initialized module to list */
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imod = OPENSSL_malloc(sizeof(*imod));
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if (imod == NULL)
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goto err;
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imod->pmod = pmod;
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imod->name = OPENSSL_strdup(name);
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imod->value = OPENSSL_strdup(value);
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imod->usr_data = NULL;
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if (!imod->name || !imod->value)
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goto memerr;
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/* Try to initialize module */
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if (pmod->init) {
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ret = pmod->init(imod, cnf);
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init_called = 1;
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/* Error occurred, exit */
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if (ret <= 0)
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goto err;
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}
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if (initialized_modules == NULL) {
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initialized_modules = sk_CONF_IMODULE_new_null();
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if (!initialized_modules) {
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CONFerr(CONF_F_MODULE_INIT, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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}
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if (!sk_CONF_IMODULE_push(initialized_modules, imod)) {
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CONFerr(CONF_F_MODULE_INIT, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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pmod->links++;
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return ret;
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err:
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/* We've started the module so we'd better finish it */
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if (pmod->finish && init_called)
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pmod->finish(imod);
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memerr:
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if (imod) {
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OPENSSL_free(imod->name);
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OPENSSL_free(imod->value);
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OPENSSL_free(imod);
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}
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return -1;
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}
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/*
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* Unload any dynamic modules that have a link count of zero: i.e. have no
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* active initialized modules. If 'all' is set then all modules are unloaded
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* including static ones.
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*/
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void CONF_modules_unload(int all)
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{
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int i;
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CONF_MODULE *md;
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CONF_modules_finish();
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/* unload modules in reverse order */
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for (i = sk_CONF_MODULE_num(supported_modules) - 1; i >= 0; i--) {
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md = sk_CONF_MODULE_value(supported_modules, i);
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/* If static or in use and 'all' not set ignore it */
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if (((md->links > 0) || !md->dso) && !all)
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continue;
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/* Since we're working in reverse this is OK */
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(void)sk_CONF_MODULE_delete(supported_modules, i);
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module_free(md);
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}
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if (sk_CONF_MODULE_num(supported_modules) == 0) {
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sk_CONF_MODULE_free(supported_modules);
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supported_modules = NULL;
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}
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}
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/* unload a single module */
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static void module_free(CONF_MODULE *md)
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{
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DSO_free(md->dso);
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OPENSSL_free(md->name);
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OPENSSL_free(md);
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}
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/* finish and free up all modules instances */
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void CONF_modules_finish(void)
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{
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CONF_IMODULE *imod;
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while (sk_CONF_IMODULE_num(initialized_modules) > 0) {
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imod = sk_CONF_IMODULE_pop(initialized_modules);
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module_finish(imod);
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}
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sk_CONF_IMODULE_free(initialized_modules);
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initialized_modules = NULL;
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}
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/* finish a module instance */
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static void module_finish(CONF_IMODULE *imod)
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{
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if (!imod)
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return;
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if (imod->pmod->finish)
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imod->pmod->finish(imod);
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imod->pmod->links--;
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OPENSSL_free(imod->name);
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OPENSSL_free(imod->value);
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OPENSSL_free(imod);
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}
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/* Add a static module to OpenSSL */
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int CONF_module_add(const char *name, conf_init_func *ifunc,
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conf_finish_func *ffunc)
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{
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if (module_add(NULL, name, ifunc, ffunc))
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return 1;
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else
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return 0;
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}
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void conf_modules_free_int(void)
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{
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CONF_modules_finish();
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CONF_modules_unload(1);
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}
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/* Utility functions */
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const char *CONF_imodule_get_name(const CONF_IMODULE *md)
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{
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return md->name;
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}
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const char *CONF_imodule_get_value(const CONF_IMODULE *md)
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{
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return md->value;
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}
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void *CONF_imodule_get_usr_data(const CONF_IMODULE *md)
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{
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return md->usr_data;
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}
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void CONF_imodule_set_usr_data(CONF_IMODULE *md, void *usr_data)
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{
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md->usr_data = usr_data;
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}
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CONF_MODULE *CONF_imodule_get_module(const CONF_IMODULE *md)
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{
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return md->pmod;
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}
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unsigned long CONF_imodule_get_flags(const CONF_IMODULE *md)
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{
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return md->flags;
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}
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void CONF_imodule_set_flags(CONF_IMODULE *md, unsigned long flags)
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{
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md->flags = flags;
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}
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void *CONF_module_get_usr_data(CONF_MODULE *pmod)
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{
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return pmod->usr_data;
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}
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void CONF_module_set_usr_data(CONF_MODULE *pmod, void *usr_data)
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{
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pmod->usr_data = usr_data;
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}
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/* Return default config file name */
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char *CONF_get1_default_config_file(void)
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{
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char *file, *sep = "";
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int len;
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if ((file = ossl_safe_getenv("OPENSSL_CONF")) != NULL)
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return OPENSSL_strdup(file);
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len = strlen(X509_get_default_cert_area());
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#ifndef OPENSSL_SYS_VMS
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len++;
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sep = "/";
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#endif
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len += strlen(OPENSSL_CONF);
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file = OPENSSL_malloc(len + 1);
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if (file == NULL)
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return NULL;
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BIO_snprintf(file, len + 1, "%s%s%s", X509_get_default_cert_area(),
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sep, OPENSSL_CONF);
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return file;
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}
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/*
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* This function takes a list separated by 'sep' and calls the callback
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* function giving the start and length of each member optionally stripping
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* leading and trailing whitespace. This can be used to parse comma separated
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* lists for example.
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*/
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int CONF_parse_list(const char *list_, int sep, int nospc,
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int (*list_cb) (const char *elem, int len, void *usr),
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void *arg)
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{
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int ret;
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const char *lstart, *tmpend, *p;
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if (list_ == NULL) {
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CONFerr(CONF_F_CONF_PARSE_LIST, CONF_R_LIST_CANNOT_BE_NULL);
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return 0;
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}
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lstart = list_;
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for (;;) {
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if (nospc) {
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while (*lstart && isspace((unsigned char)*lstart))
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lstart++;
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}
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p = strchr(lstart, sep);
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if (p == lstart || !*lstart)
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ret = list_cb(NULL, 0, arg);
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else {
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if (p)
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tmpend = p - 1;
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else
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tmpend = lstart + strlen(lstart) - 1;
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if (nospc) {
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while (isspace((unsigned char)*tmpend))
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tmpend--;
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}
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ret = list_cb(lstart, tmpend - lstart + 1, arg);
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}
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if (ret <= 0)
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return ret;
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if (p == NULL)
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return 1;
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lstart = p + 1;
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}
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}
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