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openssl/crypto/conf/conf_mod.c
Neil Horman 97bfbb98b0 Allow openssl version to function in the absence of a config file 
the openssl application attempts to load a config file on startup
always, calling x509_get_default_cert_area() to locate the file.  On
Windows builds with -DOSSL_WINCTX set, this fails if the corresponding
registry keys are unset. allow openssl to continue to function properly
for applets that don't actually require a configuration file.

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/24450)
2024-07-09 04:01:44 -04:00

766 lines
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/*
* Copyright 2002-2024 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
/* We need to use some engine deprecated APIs */
#define OPENSSL_SUPPRESS_DEPRECATED
#include "internal/cryptlib.h"
#include "internal/rcu.h"
#include <stdio.h>
#include <ctype.h>
#include <openssl/crypto.h>
#include "internal/conf.h"
#include <openssl/conf_api.h>
#include "internal/dso.h"
#include "internal/thread_once.h"
#include <openssl/x509.h>
#include <openssl/trace.h>
#include <openssl/engine.h>
#include "conf_local.h"
DEFINE_STACK_OF(CONF_MODULE)
DEFINE_STACK_OF(CONF_IMODULE)
#define DSO_mod_init_name "OPENSSL_init"
#define DSO_mod_finish_name "OPENSSL_finish"
/*
* This structure contains a data about supported modules. entries in this
* table correspond to either dynamic or static modules.
*/
struct conf_module_st {
/* DSO of this module or NULL if static */
DSO *dso;
/* Name of the module */
char *name;
/* Init function */
conf_init_func *init;
/* Finish function */
conf_finish_func *finish;
/* Number of successfully initialized modules */
int links;
void *usr_data;
};
/*
* This structure contains information about modules that have been
* successfully initialized. There may be more than one entry for a given
* module.
*/
struct conf_imodule_st {
CONF_MODULE *pmod;
char *name;
char *value;
unsigned long flags;
void *usr_data;
};
static CRYPTO_ONCE init_module_list_lock = CRYPTO_ONCE_STATIC_INIT;
static CRYPTO_RCU_LOCK *module_list_lock = NULL;
static STACK_OF(CONF_MODULE) *supported_modules = NULL; /* protected by lock */
static STACK_OF(CONF_IMODULE) *initialized_modules = NULL; /* protected by lock */
static CRYPTO_ONCE load_builtin_modules = CRYPTO_ONCE_STATIC_INIT;
static void module_free(CONF_MODULE *md);
static void module_finish(CONF_IMODULE *imod);
static int module_run(const CONF *cnf, const char *name, const char *value,
unsigned long flags);
static CONF_MODULE *module_add(DSO *dso, const char *name,
conf_init_func *ifunc,
conf_finish_func *ffunc);
static CONF_MODULE *module_find(const char *name);
static int module_init(CONF_MODULE *pmod, const char *name, const char *value,
const CONF *cnf);
static CONF_MODULE *module_load_dso(const CONF *cnf, const char *name,
const char *value);
static int conf_modules_finish_int(void);
static void module_lists_free(void)
{
ossl_rcu_lock_free(module_list_lock);
module_list_lock = NULL;
sk_CONF_MODULE_free(supported_modules);
supported_modules = NULL;
sk_CONF_IMODULE_free(initialized_modules);
initialized_modules = NULL;
}
DEFINE_RUN_ONCE_STATIC(do_init_module_list_lock)
{
module_list_lock = ossl_rcu_lock_new(1, NULL);
if (module_list_lock == NULL) {
ERR_raise(ERR_LIB_CONF, ERR_R_CRYPTO_LIB);
return 0;
}
return 1;
}
static int conf_diagnostics(const CONF *cnf)
{
int status;
long result = 0;
ERR_set_mark();
status = NCONF_get_number_e(cnf, NULL, "config_diagnostics", &result);
ERR_pop_to_mark();
if (status > 0) {
OSSL_LIB_CTX_set_conf_diagnostics(cnf->libctx, result > 0);
return result > 0;
}
return OSSL_LIB_CTX_get_conf_diagnostics(cnf->libctx);
}
/* Main function: load modules from a CONF structure */
int CONF_modules_load(const CONF *cnf, const char *appname,
unsigned long flags)
{
STACK_OF(CONF_VALUE) *values;
CONF_VALUE *vl;
char *vsection = NULL;
int ret, i;
if (!cnf)
return 1;
if (conf_diagnostics(cnf))
flags &= ~(CONF_MFLAGS_IGNORE_ERRORS
| CONF_MFLAGS_IGNORE_RETURN_CODES
| CONF_MFLAGS_SILENT
| CONF_MFLAGS_IGNORE_MISSING_FILE);
ERR_set_mark();
if (appname)
vsection = NCONF_get_string(cnf, NULL, appname);
if (!appname || (!vsection && (flags & CONF_MFLAGS_DEFAULT_SECTION)))
vsection = NCONF_get_string(cnf, NULL, "openssl_conf");
if (!vsection) {
ERR_pop_to_mark();
return 1;
}
OSSL_TRACE1(CONF, "Configuration in section %s\n", vsection);
values = NCONF_get_section(cnf, vsection);
if (values == NULL) {
if (!(flags & CONF_MFLAGS_SILENT)) {
ERR_clear_last_mark();
ERR_raise_data(ERR_LIB_CONF,
CONF_R_OPENSSL_CONF_REFERENCES_MISSING_SECTION,
"openssl_conf=%s", vsection);
} else {
ERR_pop_to_mark();
}
return 0;
}
ERR_pop_to_mark();
for (i = 0; i < sk_CONF_VALUE_num(values); i++) {
vl = sk_CONF_VALUE_value(values, i);
ERR_set_mark();
ret = module_run(cnf, vl->name, vl->value, flags);
OSSL_TRACE3(CONF, "Running module %s (%s) returned %d\n",
vl->name, vl->value, ret);
if (ret <= 0)
if (!(flags & CONF_MFLAGS_IGNORE_ERRORS)) {
ERR_clear_last_mark();
return ret;
}
ERR_pop_to_mark();
}
return 1;
}
int CONF_modules_load_file_ex(OSSL_LIB_CTX *libctx, const char *filename,
const char *appname, unsigned long flags)
{
char *file = NULL;
CONF *conf = NULL;
int ret = 0, diagnostics = OSSL_LIB_CTX_get_conf_diagnostics(libctx);
ERR_set_mark();
if (filename == NULL) {
file = CONF_get1_default_config_file();
if (file == NULL)
goto err;
if (*file == '\0') {
/* Do not try to load an empty file name but do not error out */
ret = 1;
goto err;
}
} else {
file = (char *)filename;
}
conf = NCONF_new_ex(libctx, NULL);
if (conf == NULL)
goto err;
if (NCONF_load(conf, file, NULL) <= 0) {
if ((flags & CONF_MFLAGS_IGNORE_MISSING_FILE) &&
(ERR_GET_REASON(ERR_peek_last_error()) == CONF_R_NO_SUCH_FILE)) {
ret = 1;
}
goto err;
}
ret = CONF_modules_load(conf, appname, flags);
/* CONF_modules_load() might change the diagnostics setting, reread it. */
diagnostics = OSSL_LIB_CTX_get_conf_diagnostics(libctx);
err:
if (filename == NULL)
OPENSSL_free(file);
NCONF_free(conf);
if ((flags & CONF_MFLAGS_IGNORE_RETURN_CODES) != 0 && !diagnostics)
ret = 1;
if (ret > 0)
ERR_pop_to_mark();
else
ERR_clear_last_mark();
return ret;
}
int CONF_modules_load_file(const char *filename,
const char *appname, unsigned long flags)
{
return CONF_modules_load_file_ex(NULL, filename, appname, flags);
}
DEFINE_RUN_ONCE_STATIC(do_load_builtin_modules)
{
OPENSSL_load_builtin_modules();
#ifndef OPENSSL_NO_ENGINE
/* Need to load ENGINEs */
ENGINE_load_builtin_engines();
#endif
return 1;
}
static int module_run(const CONF *cnf, const char *name, const char *value,
unsigned long flags)
{
CONF_MODULE *md;
int ret;
if (!RUN_ONCE(&load_builtin_modules, do_load_builtin_modules))
return -1;
md = module_find(name);
/* Module not found: try to load DSO */
if (!md && !(flags & CONF_MFLAGS_NO_DSO))
md = module_load_dso(cnf, name, value);
if (!md) {
if (!(flags & CONF_MFLAGS_SILENT)) {
ERR_raise_data(ERR_LIB_CONF, CONF_R_UNKNOWN_MODULE_NAME,
"module=%s", name);
}
return -1;
}
ret = module_init(md, name, value, cnf);
if (ret <= 0) {
if (!(flags & CONF_MFLAGS_SILENT))
ERR_raise_data(ERR_LIB_CONF, CONF_R_MODULE_INITIALIZATION_ERROR,
"module=%s, value=%s retcode=%-8d",
name, value, ret);
}
return ret;
}
/* Load a module from a DSO */
static CONF_MODULE *module_load_dso(const CONF *cnf,
const char *name, const char *value)
{
DSO *dso = NULL;
conf_init_func *ifunc;
conf_finish_func *ffunc;
const char *path = NULL;
int errcode = 0;
CONF_MODULE *md;
/* Look for alternative path in module section */
path = _CONF_get_string(cnf, value, "path");
if (path == NULL) {
path = name;
}
dso = DSO_load(NULL, path, NULL, 0);
if (dso == NULL) {
errcode = CONF_R_ERROR_LOADING_DSO;
goto err;
}
ifunc = (conf_init_func *)DSO_bind_func(dso, DSO_mod_init_name);
if (ifunc == NULL) {
errcode = CONF_R_MISSING_INIT_FUNCTION;
goto err;
}
ffunc = (conf_finish_func *)DSO_bind_func(dso, DSO_mod_finish_name);
/* All OK, add module */
md = module_add(dso, name, ifunc, ffunc);
if (md == NULL)
goto err;
return md;
err:
DSO_free(dso);
ERR_raise_data(ERR_LIB_CONF, errcode, "module=%s, path=%s", name, path);
return NULL;
}
/* add module to list */
static CONF_MODULE *module_add(DSO *dso, const char *name,
conf_init_func *ifunc, conf_finish_func *ffunc)
{
CONF_MODULE *tmod = NULL;
STACK_OF(CONF_MODULE) *old_modules;
STACK_OF(CONF_MODULE) *new_modules;
if (!RUN_ONCE(&init_module_list_lock, do_init_module_list_lock))
return NULL;
ossl_rcu_write_lock(module_list_lock);
old_modules = ossl_rcu_deref(&supported_modules);
if (old_modules == NULL)
new_modules = sk_CONF_MODULE_new_null();
else
new_modules = sk_CONF_MODULE_dup(old_modules);
if (new_modules == NULL)
goto err;
if ((tmod = OPENSSL_zalloc(sizeof(*tmod))) == NULL)
goto err;
tmod->dso = dso;
tmod->name = OPENSSL_strdup(name);
tmod->init = ifunc;
tmod->finish = ffunc;
if (tmod->name == NULL)
goto err;
if (!sk_CONF_MODULE_push(new_modules, tmod))
goto err;
ossl_rcu_assign_ptr(&supported_modules, &new_modules);
ossl_rcu_write_unlock(module_list_lock);
ossl_synchronize_rcu(module_list_lock);
sk_CONF_MODULE_free(old_modules);
return tmod;
err:
ossl_rcu_write_unlock(module_list_lock);
if (tmod != NULL) {
OPENSSL_free(tmod->name);
OPENSSL_free(tmod);
}
sk_CONF_MODULE_free(new_modules);
return NULL;
}
/*
* Find a module from the list. We allow module names of the form
* modname.XXXX to just search for modname to allow the same module to be
* initialized more than once.
*/
static CONF_MODULE *module_find(const char *name)
{
CONF_MODULE *tmod;
int i, nchar;
char *p;
STACK_OF(CONF_MODULE) *mods;
p = strrchr(name, '.');
if (p)
nchar = p - name;
else
nchar = strlen(name);
if (!RUN_ONCE(&init_module_list_lock, do_init_module_list_lock))
return NULL;
ossl_rcu_read_lock(module_list_lock);
mods = ossl_rcu_deref(&supported_modules);
for (i = 0; i < sk_CONF_MODULE_num(mods); i++) {
tmod = sk_CONF_MODULE_value(mods, i);
if (strncmp(tmod->name, name, nchar) == 0) {
ossl_rcu_read_unlock(module_list_lock);
return tmod;
}
}
ossl_rcu_read_unlock(module_list_lock);
return NULL;
}
/* initialize a module */
static int module_init(CONF_MODULE *pmod, const char *name, const char *value,
const CONF *cnf)
{
int ret = 1;
int init_called = 0;
CONF_IMODULE *imod = NULL;
STACK_OF(CONF_IMODULE) *old_modules;
STACK_OF(CONF_IMODULE) *new_modules;
/* Otherwise add initialized module to list */
imod = OPENSSL_malloc(sizeof(*imod));
if (imod == NULL)
goto err;
imod->pmod = pmod;
imod->name = OPENSSL_strdup(name);
imod->value = OPENSSL_strdup(value);
imod->usr_data = NULL;
if (!imod->name || !imod->value)
goto memerr;
/* Try to initialize module */
if (pmod->init) {
ret = pmod->init(imod, cnf);
init_called = 1;
/* Error occurred, exit */
if (ret <= 0)
goto err;
}
if (!RUN_ONCE(&init_module_list_lock, do_init_module_list_lock))
goto err;
ossl_rcu_write_lock(module_list_lock);
old_modules = ossl_rcu_deref(&initialized_modules);
if (old_modules == NULL)
new_modules = sk_CONF_IMODULE_new_null();
else
new_modules = sk_CONF_IMODULE_dup(old_modules);
if (new_modules == NULL) {
ossl_rcu_write_unlock(module_list_lock);
ERR_raise(ERR_LIB_CONF, ERR_R_CRYPTO_LIB);
goto err;
}
if (!sk_CONF_IMODULE_push(new_modules, imod)) {
ossl_rcu_write_unlock(module_list_lock);
sk_CONF_IMODULE_free(new_modules);
ERR_raise(ERR_LIB_CONF, ERR_R_CRYPTO_LIB);
goto err;
}
pmod->links++;
ossl_rcu_assign_ptr(&initialized_modules, &new_modules);
ossl_rcu_write_unlock(module_list_lock);
ossl_synchronize_rcu(module_list_lock);
sk_CONF_IMODULE_free(old_modules);
return ret;
err:
/* We've started the module so we'd better finish it */
if (pmod->finish && init_called)
pmod->finish(imod);
memerr:
if (imod) {
OPENSSL_free(imod->name);
OPENSSL_free(imod->value);
OPENSSL_free(imod);
}
return -1;
}
/*
* Unload any dynamic modules that have a link count of zero: i.e. have no
* active initialized modules. If 'all' is set then all modules are unloaded
* including static ones.
*/
void CONF_modules_unload(int all)
{
int i;
CONF_MODULE *md;
STACK_OF(CONF_MODULE) *old_modules;
STACK_OF(CONF_MODULE) *new_modules;
STACK_OF(CONF_MODULE) *to_delete;
if (!conf_modules_finish_int()) /* also inits module list lock */
return;
ossl_rcu_write_lock(module_list_lock);
old_modules = ossl_rcu_deref(&supported_modules);
new_modules = sk_CONF_MODULE_dup(old_modules);
if (new_modules == NULL) {
ossl_rcu_write_unlock(module_list_lock);
return;
}
to_delete = sk_CONF_MODULE_new_null();
/* unload modules in reverse order */
for (i = sk_CONF_MODULE_num(new_modules) - 1; i >= 0; i--) {
md = sk_CONF_MODULE_value(new_modules, i);
/* If static or in use and 'all' not set ignore it */
if (((md->links > 0) || !md->dso) && !all)
continue;
/* Since we're working in reverse this is OK */
(void)sk_CONF_MODULE_delete(new_modules, i);
sk_CONF_MODULE_push(to_delete, md);
}
if (sk_CONF_MODULE_num(new_modules) == 0) {
sk_CONF_MODULE_free(new_modules);
new_modules = NULL;
}
ossl_rcu_assign_ptr(&supported_modules, &new_modules);
ossl_rcu_write_unlock(module_list_lock);
ossl_synchronize_rcu(module_list_lock);
sk_CONF_MODULE_free(old_modules);
sk_CONF_MODULE_pop_free(to_delete, module_free);
}
/* unload a single module */
static void module_free(CONF_MODULE *md)
{
DSO_free(md->dso);
OPENSSL_free(md->name);
OPENSSL_free(md);
}
/* finish and free up all modules instances */
static int conf_modules_finish_int(void)
{
CONF_IMODULE *imod;
STACK_OF(CONF_IMODULE) *old_modules;
STACK_OF(CONF_IMODULE) *new_modules = NULL;
if (!RUN_ONCE(&init_module_list_lock, do_init_module_list_lock))
return 0;
/* If module_list_lock is NULL here it means we were already unloaded */
if (module_list_lock == NULL)
return 0;
ossl_rcu_write_lock(module_list_lock);
old_modules = ossl_rcu_deref(&initialized_modules);
ossl_rcu_assign_ptr(&initialized_modules, &new_modules);
ossl_rcu_write_unlock(module_list_lock);
ossl_synchronize_rcu(module_list_lock);
while (sk_CONF_IMODULE_num(old_modules) > 0) {
imod = sk_CONF_IMODULE_pop(old_modules);
module_finish(imod);
}
sk_CONF_IMODULE_free(old_modules);
return 1;
}
void CONF_modules_finish(void)
{
conf_modules_finish_int();
}
/* finish a module instance */
static void module_finish(CONF_IMODULE *imod)
{
if (!imod)
return;
if (imod->pmod->finish)
imod->pmod->finish(imod);
imod->pmod->links--;
OPENSSL_free(imod->name);
OPENSSL_free(imod->value);
OPENSSL_free(imod);
}
/* Add a static module to OpenSSL */
int CONF_module_add(const char *name, conf_init_func *ifunc,
conf_finish_func *ffunc)
{
if (module_add(NULL, name, ifunc, ffunc))
return 1;
else
return 0;
}
void ossl_config_modules_free(void)
{
CONF_modules_unload(1); /* calls CONF_modules_finish */
module_lists_free();
}
/* Utility functions */
const char *CONF_imodule_get_name(const CONF_IMODULE *md)
{
return md->name;
}
const char *CONF_imodule_get_value(const CONF_IMODULE *md)
{
return md->value;
}
void *CONF_imodule_get_usr_data(const CONF_IMODULE *md)
{
return md->usr_data;
}
void CONF_imodule_set_usr_data(CONF_IMODULE *md, void *usr_data)
{
md->usr_data = usr_data;
}
CONF_MODULE *CONF_imodule_get_module(const CONF_IMODULE *md)
{
return md->pmod;
}
unsigned long CONF_imodule_get_flags(const CONF_IMODULE *md)
{
return md->flags;
}
void CONF_imodule_set_flags(CONF_IMODULE *md, unsigned long flags)
{
md->flags = flags;
}
void *CONF_module_get_usr_data(CONF_MODULE *pmod)
{
return pmod->usr_data;
}
void CONF_module_set_usr_data(CONF_MODULE *pmod, void *usr_data)
{
pmod->usr_data = usr_data;
}
/* Return default config file name */
char *CONF_get1_default_config_file(void)
{
const char *t;
char *file, *sep = "";
size_t size;
if ((file = ossl_safe_getenv("OPENSSL_CONF")) != NULL)
return OPENSSL_strdup(file);
t = X509_get_default_cert_area();
/*
* On windows systems with -DOSSL_WINCTX set, if the needed registry
* keys are not yet set, openssl applets will return, due to an inability
* to locate various directories, like the default cert area. In that
* event, clone an empty string here, so that commands like openssl version
* continue to operate properly without needing to set OPENSSL_CONF.
* Applets like cms will fail gracefully later when they try to parse an
* empty config file
*/
if (t == NULL)
return OPENSSL_strdup("");
#ifndef OPENSSL_SYS_VMS
sep = "/";
#endif
size = strlen(t) + strlen(sep) + strlen(OPENSSL_CONF) + 1;
file = OPENSSL_malloc(size);
if (file == NULL)
return NULL;
BIO_snprintf(file, size, "%s%s%s", t, sep, OPENSSL_CONF);
return file;
}
/*
* This function takes a list separated by 'sep' and calls the callback
* function giving the start and length of each member optionally stripping
* leading and trailing whitespace. This can be used to parse comma separated
* lists for example.
*/
int CONF_parse_list(const char *list_, int sep, int nospc,
int (*list_cb) (const char *elem, int len, void *usr),
void *arg)
{
int ret;
const char *lstart, *tmpend, *p;
if (list_ == NULL) {
ERR_raise(ERR_LIB_CONF, CONF_R_LIST_CANNOT_BE_NULL);
return 0;
}
lstart = list_;
for (;;) {
if (nospc) {
while (*lstart && isspace((unsigned char)*lstart))
lstart++;
}
p = strchr(lstart, sep);
if (p == lstart || *lstart == '\0')
ret = list_cb(NULL, 0, arg);
else {
if (p)
tmpend = p - 1;
else
tmpend = lstart + strlen(lstart) - 1;
if (nospc) {
while (isspace((unsigned char)*tmpend))
tmpend--;
}
ret = list_cb(lstart, tmpend - lstart + 1, arg);
}
if (ret <= 0)
return ret;
if (p == NULL)
return 1;
lstart = p + 1;
}
}
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