/*

 * Copyright 2000-2021 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

 */

#include "e_os.h"

#include <stdio.h>

#include <string.h>

#include "internal/conf.h"

#include "crypto/ctype.h"

#include <openssl/crypto.h>

#include <openssl/err.h>

#include <openssl/conf.h>

#include <openssl/conf_api.h>

#include "conf_local.h"

#include <openssl/lhash.h>

static CONF_METHOD *default_CONF_method = NULL;

/* Init a 'CONF' structure from an old LHASH */

void CONF_set_nconf(CONF *conf, LHASH_OF(CONF_VALUE) *hash)

{

    if (default_CONF_method == NULL)

        default_CONF_method = NCONF_default();

    default_CONF_method->init(conf);

    conf->data = hash;

}

/*

 * The following section contains the "CONF classic" functions, rewritten in

 * terms of the new CONF interface.

 */

int CONF_set_default_method(CONF_METHOD *meth)

{

    default_CONF_method = meth;

    return 1;

}

LHASH_OF(CONF_VALUE) *CONF_load(LHASH_OF(CONF_VALUE) *conf, const char *file,

                                long *eline)

{

    LHASH_OF(CONF_VALUE) *ltmp;

    BIO *in = NULL;

#ifdef OPENSSL_SYS_VMS

    in = BIO_new_file(file, "r");

#else

    in = BIO_new_file(file, "rb");

#endif

    if (in == NULL) {

        ERR_raise(ERR_LIB_CONF, ERR_R_SYS_LIB);

        return NULL;

    }

    ltmp = CONF_load_bio(conf, in, eline);

    BIO_free(in);

    return ltmp;

}

#ifndef OPENSSL_NO_STDIO

LHASH_OF(CONF_VALUE) *CONF_load_fp(LHASH_OF(CONF_VALUE) *conf, FILE *fp,

                                   long *eline)

{

    BIO *btmp;

    LHASH_OF(CONF_VALUE) *ltmp;

    if ((btmp = BIO_new_fp(fp, BIO_NOCLOSE)) == NULL) {

        ERR_raise(ERR_LIB_CONF, ERR_R_BUF_LIB);

        return NULL;

    }

    ltmp = CONF_load_bio(conf, btmp, eline);

    BIO_free(btmp);

    return ltmp;

}

#endif

LHASH_OF(CONF_VALUE) *CONF_load_bio(LHASH_OF(CONF_VALUE) *conf, BIO *bp,

                                    long *eline)

{

    CONF ctmp;

    int ret;

    CONF_set_nconf(&ctmp, conf);

    ret = NCONF_load_bio(&ctmp, bp, eline);

    if (ret)

        return ctmp.data;

    return NULL;

}

STACK_OF(CONF_VALUE) *CONF_get_section(LHASH_OF(CONF_VALUE) *conf,

                                       const char *section)

{

    if (conf == NULL) {

        return NULL;

    } else {

        CONF ctmp;

        CONF_set_nconf(&ctmp, conf);

        return NCONF_get_section(&ctmp, section);

    }

}

char *CONF_get_string(LHASH_OF(CONF_VALUE) *conf, const char *group,

                      const char *name)

{

    if (conf == NULL) {

        return NCONF_get_string(NULL, group, name);

    } else {

        CONF ctmp;

        CONF_set_nconf(&ctmp, conf);

        return NCONF_get_string(&ctmp, group, name);

    }

}

long CONF_get_number(LHASH_OF(CONF_VALUE) *conf, const char *group,

                     const char *name)

{

    int status;

    long result = 0;

    ERR_set_mark();

    if (conf == NULL) {

        status = NCONF_get_number_e(NULL, group, name, &result);

    } else {

        CONF ctmp;

        CONF_set_nconf(&ctmp, conf);

        status = NCONF_get_number_e(&ctmp, group, name, &result);

    }

    ERR_pop_to_mark();

    return status == 0 ? 0L : result;

}

void CONF_free(LHASH_OF(CONF_VALUE) *conf)

{

    CONF ctmp;

    CONF_set_nconf(&ctmp, conf);

    NCONF_free_data(&ctmp);

}

#ifndef OPENSSL_NO_STDIO

int CONF_dump_fp(LHASH_OF(CONF_VALUE) *conf, FILE *out)

{

    BIO *btmp;

    int ret;

    if ((btmp = BIO_new_fp(out, BIO_NOCLOSE)) == NULL) {

        ERR_raise(ERR_LIB_CONF, ERR_R_BUF_LIB);

        return 0;

    }

    ret = CONF_dump_bio(conf, btmp);

    BIO_free(btmp);

    return ret;

}

#endif

int CONF_dump_bio(LHASH_OF(CONF_VALUE) *conf, BIO *out)

{

    CONF ctmp;

    CONF_set_nconf(&ctmp, conf);

    return NCONF_dump_bio(&ctmp, out);

}

/*

 * The following section contains the "New CONF" functions.  They are

 * completely centralised around a new CONF structure that may contain

 * basically anything, but at least a method pointer and a table of data.

 * These functions are also written in terms of the bridge functions used by

 * the "CONF classic" functions, for consistency.

 */

CONF *NCONF_new_ex(OSSL_LIB_CTX *libctx, CONF_METHOD *meth)

{

    CONF *ret;

    if (meth == NULL)

        meth = NCONF_default();

    ret = meth->create(meth);

    if (ret == NULL) {

        ERR_raise(ERR_LIB_CONF, ERR_R_MALLOC_FAILURE);

        return NULL;

    }

    ret->libctx = libctx;

    return ret;

}

CONF *NCONF_new(CONF_METHOD *meth)

{

    return NCONF_new_ex(NULL, meth);

}

void NCONF_free(CONF *conf)

{

    if (conf == NULL)

        return;

    conf->meth->destroy(conf);

}

void NCONF_free_data(CONF *conf)

{

    if (conf == NULL)

        return;

    conf->meth->destroy_data(conf);

}

OSSL_LIB_CTX *NCONF_get0_libctx(const CONF *conf)

{

    return conf->libctx;

}

typedef STACK_OF(OPENSSL_CSTRING) SECTION_NAMES;

IMPLEMENT_LHASH_DOALL_ARG_CONST(CONF_VALUE, SECTION_NAMES);

static void collect_section_name(const CONF_VALUE *v, SECTION_NAMES *names)

{

    /* A section is a CONF_VALUE with name == NULL */

    if (v->name == NULL)

        sk_OPENSSL_CSTRING_push(names, v->section);

}

static int section_name_cmp(OPENSSL_CSTRING const *a, OPENSSL_CSTRING const *b)

{

    return strcmp(*a, *b);

}

STACK_OF(OPENSSL_CSTRING) *NCONF_get_section_names(const CONF *cnf)

{

    SECTION_NAMES *names;

    if ((names = sk_OPENSSL_CSTRING_new(section_name_cmp)) == NULL)

        return NULL;

    lh_CONF_VALUE_doall_SECTION_NAMES(cnf->data, collect_section_name, names);

    sk_OPENSSL_CSTRING_sort(names);

    return names;

}

int NCONF_load(CONF *conf, const char *file, long *eline)

{

    if (conf == NULL) {

        ERR_raise(ERR_LIB_CONF, CONF_R_NO_CONF);

        return 0;

    }

    return conf->meth->load(conf, file, eline);

}

#ifndef OPENSSL_NO_STDIO

int NCONF_load_fp(CONF *conf, FILE *fp, long *eline)

{

    BIO *btmp;

    int ret;

    if ((btmp = BIO_new_fp(fp, BIO_NOCLOSE)) == NULL) {

        ERR_raise(ERR_LIB_CONF, ERR_R_BUF_LIB);

        return 0;

    }

    ret = NCONF_load_bio(conf, btmp, eline);

    BIO_free(btmp);

    return ret;

}

#endif

int NCONF_load_bio(CONF *conf, BIO *bp, long *eline)

{

    if (conf == NULL) {

        ERR_raise(ERR_LIB_CONF, CONF_R_NO_CONF);

        return 0;

    }

    return conf->meth->load_bio(conf, bp, eline);

}

STACK_OF(CONF_VALUE) *NCONF_get_section(const CONF *conf, const char *section)

{

    if (conf == NULL) {

        ERR_raise(ERR_LIB_CONF, CONF_R_NO_CONF);

        return NULL;

    }

    if (section == NULL) {

        ERR_raise(ERR_LIB_CONF, CONF_R_NO_SECTION);

        return NULL;

    }

    return _CONF_get_section_values(conf, section);

}

char *NCONF_get_string(const CONF *conf, const char *group, const char *name)

{

    char *s = _CONF_get_string(conf, group, name);

    /*

     * Since we may get a value from an environment variable even if conf is

     * NULL, let's check the value first

     */

    if (s)

        return s;

    if (conf == NULL) {

        ERR_raise(ERR_LIB_CONF, CONF_R_NO_CONF_OR_ENVIRONMENT_VARIABLE);

        return NULL;

    }

    ERR_raise_data(ERR_LIB_CONF, CONF_R_NO_VALUE,

                   "group=%s name=%s", group, name);

    return NULL;

}

static int default_is_number(const CONF *conf, char c)

{

    return ossl_isdigit(c);

}

static int default_to_int(const CONF *conf, char c)

{

    return (int)(c - '0');

}

int NCONF_get_number_e(const CONF *conf, const char *group, const char *name,

                       long *result)

{

    char *str;

    long res;

    int (*is_number)(const CONF *, char) = &default_is_number;

    int (*to_int)(const CONF *, char) = &default_to_int;

    if (result == NULL) {

        ERR_raise(ERR_LIB_CONF, ERR_R_PASSED_NULL_PARAMETER);

        return 0;

    }

    str = NCONF_get_string(conf, group, name);

    if (str == NULL)

        return 0;

    if (conf != NULL) {

        if (conf->meth->is_number != NULL)

            is_number = conf->meth->is_number;

        if (conf->meth->to_int != NULL)

            to_int = conf->meth->to_int;

    }

    for (res = 0; is_number(conf, *str); str++) {

        const int d = to_int(conf, *str);

        if (res > (LONG_MAX - d) / 10L) {

            ERR_raise(ERR_LIB_CONF, CONF_R_NUMBER_TOO_LARGE);

            return 0;

        }

        res = res * 10 + d;

    }

    *result = res;

    return 1;

}

long _CONF_get_number(const CONF *conf, const char *section,

                      const char *name)

{

    int status;

    long result = 0;

    ERR_set_mark();

    status = NCONF_get_number_e(conf, section, name, &result);

    ERR_pop_to_mark();

    return status == 0 ? 0L : result;

}

#ifndef OPENSSL_NO_STDIO

int NCONF_dump_fp(const CONF *conf, FILE *out)

{

    BIO *btmp;

    int ret;

    if ((btmp = BIO_new_fp(out, BIO_NOCLOSE)) == NULL) {

        ERR_raise(ERR_LIB_CONF, ERR_R_BUF_LIB);

        return 0;

    }

    ret = NCONF_dump_bio(conf, btmp);

    BIO_free(btmp);

    return ret;

}

#endif

int NCONF_dump_bio(const CONF *conf, BIO *out)

{

    if (conf == NULL) {

        ERR_raise(ERR_LIB_CONF, CONF_R_NO_CONF);

        return 0;

    }

    return conf->meth->dump(conf, out);

}

/*

 * These routines call the C malloc/free, to avoid intermixing with

 * OpenSSL function pointers before the library is initialized.

 */

OPENSSL_INIT_SETTINGS *OPENSSL_INIT_new(void)

{

    OPENSSL_INIT_SETTINGS *ret = malloc(sizeof(*ret));

    if (ret == NULL)

        return NULL;

    memset(ret, 0, sizeof(*ret));

    ret->flags = DEFAULT_CONF_MFLAGS;

    return ret;

}

#ifndef OPENSSL_NO_STDIO

int OPENSSL_INIT_set_config_filename(OPENSSL_INIT_SETTINGS *settings,

                                     const char *filename)

{

    char *newfilename = NULL;

    if (filename != NULL) {

        newfilename = strdup(filename);

        if (newfilename == NULL)

            return 0;

    }

    free(settings->filename);

    settings->filename = newfilename;

    return 1;

}

void OPENSSL_INIT_set_config_file_flags(OPENSSL_INIT_SETTINGS *settings,

                                        unsigned long flags)

{

    settings->flags = flags;

}

int OPENSSL_INIT_set_config_appname(OPENSSL_INIT_SETTINGS *settings,

                                    const char *appname)

{

    char *newappname = NULL;

    if (appname != NULL) {

        newappname = strdup(appname);

        if (newappname == NULL)

            return 0;

    }

    free(settings->appname);

    settings->appname = newappname;

    return 1;

}

#endif

void OPENSSL_INIT_free(OPENSSL_INIT_SETTINGS *settings)

{

    free(settings->filename);

    free(settings->appname);

    free(settings);

}