/*

 * Copyright 2015-2021 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 <stdio.h>

#include <string.h>

#include <openssl/conf.h>

#include <openssl/err.h>

#include "internal/sslconf.h"

#include "conf_local.h"

/*

 * SSL library configuration module placeholder. We load it here but defer

 * all decisions about its contents to libssl.

 */

struct ssl_conf_name_st {

    /* Name of this set of commands */

    char *name;

    /* List of commands */

    SSL_CONF_CMD *cmds;

    /* Number of commands */

    size_t cmd_count;

};

struct ssl_conf_cmd_st {

    /* Command */

    char *cmd;

    /* Argument */

    char *arg;

};

static struct ssl_conf_name_st *ssl_names;

static size_t ssl_names_count;

static void ssl_module_free(CONF_IMODULE *md)

{

    size_t i, j;

    if (ssl_names == NULL)

        return;

    for (i = 0; i < ssl_names_count; i++) {

        struct ssl_conf_name_st *tname = ssl_names + i;

        OPENSSL_free(tname->name);

        for (j = 0; j < tname->cmd_count; j++) {

            OPENSSL_free(tname->cmds[j].cmd);

            OPENSSL_free(tname->cmds[j].arg);

        }

        OPENSSL_free(tname->cmds);

    }

    OPENSSL_free(ssl_names);

    ssl_names = NULL;

    ssl_names_count = 0;

}

static int ssl_module_init(CONF_IMODULE *md, const CONF *cnf)

{

    size_t i, j, cnt;

    int rv = 0;

    const char *ssl_conf_section;

    STACK_OF(CONF_VALUE) *cmd_lists;

    ssl_conf_section = CONF_imodule_get_value(md);

    cmd_lists = NCONF_get_section(cnf, ssl_conf_section);

    if (sk_CONF_VALUE_num(cmd_lists) <= 0) {

        int rcode =

            cmd_lists == NULL

            ? CONF_R_SSL_SECTION_NOT_FOUND

            : CONF_R_SSL_SECTION_EMPTY;

        ERR_raise_data(ERR_LIB_CONF, rcode, "section=%s", ssl_conf_section);

        goto err;

    }

    cnt = sk_CONF_VALUE_num(cmd_lists);

    ssl_module_free(md);

    ssl_names = OPENSSL_zalloc(sizeof(*ssl_names) * cnt);

    if (ssl_names == NULL)

        goto err;

    ssl_names_count = cnt;

    for (i = 0; i < ssl_names_count; i++) {

        struct ssl_conf_name_st *ssl_name = ssl_names + i;

        CONF_VALUE *sect = sk_CONF_VALUE_value(cmd_lists, (int)i);

        STACK_OF(CONF_VALUE) *cmds = NCONF_get_section(cnf, sect->value);

        if (sk_CONF_VALUE_num(cmds) <= 0) {

            int rcode =

                cmds == NULL

                ? CONF_R_SSL_COMMAND_SECTION_NOT_FOUND

                : CONF_R_SSL_COMMAND_SECTION_EMPTY;

            ERR_raise_data(ERR_LIB_CONF, rcode,

                           "name=%s, value=%s", sect->name, sect->value);

            goto err;

        }

        ssl_name->name = OPENSSL_strdup(sect->name);

        if (ssl_name->name == NULL)

            goto err;

        cnt = sk_CONF_VALUE_num(cmds);

        ssl_name->cmds = OPENSSL_zalloc(cnt * sizeof(struct ssl_conf_cmd_st));

        if (ssl_name->cmds == NULL)

            goto err;

        ssl_name->cmd_count = cnt;

        for (j = 0; j < cnt; j++) {

            const char *name;

            CONF_VALUE *cmd_conf = sk_CONF_VALUE_value(cmds, (int)j);

            struct ssl_conf_cmd_st *cmd = ssl_name->cmds + j;

            /* Skip any initial dot in name */

            name = strchr(cmd_conf->name, '.');

            if (name != NULL)

                name++;

            else

                name = cmd_conf->name;

            cmd->cmd = OPENSSL_strdup(name);

            cmd->arg = OPENSSL_strdup(cmd_conf->value);

            if (cmd->cmd == NULL || cmd->arg == NULL)

                goto err;

        }

    }

    rv = 1;

 err:

    if (rv == 0)

        ssl_module_free(md);

    return rv;

}

/*

 * Returns the set of commands with index |idx| previously searched for via

 * conf_ssl_name_find. Also stores the name of the set of commands in |*name|

 * and the number of commands in the set in |*cnt|.

 */

const SSL_CONF_CMD *conf_ssl_get(size_t idx, const char **name, size_t *cnt)

{

    *name = ssl_names[idx].name;

    *cnt = ssl_names[idx].cmd_count;

    return ssl_names[idx].cmds;

}

/*

 * Search for the named set of commands given in |name|. On success return the

 * index for the command set in |*idx|.

 * Returns 1 on success or 0 on failure.

 */

int conf_ssl_name_find(const char *name, size_t *idx)

{

    size_t i;

    const struct ssl_conf_name_st *nm;

    if (name == NULL)

        return 0;

    for (i = 0, nm = ssl_names; i < ssl_names_count; i++, nm++) {

        if (strcmp(nm->name, name) == 0) {

            *idx = i;

            return 1;

        }

    }

    return 0;

}

/*

 * Given a command set |cmd|, return details on the command at index |idx| which

 * must be less than the number of commands in the set (as returned by

 * conf_ssl_get). The name of the command will be returned in |*cmdstr| and the

 * argument is returned in |*arg|.

 */

void conf_ssl_get_cmd(const SSL_CONF_CMD *cmd, size_t idx, char **cmdstr,

                      char **arg)

{

    *cmdstr = cmd[idx].cmd;

    *arg = cmd[idx].arg;

}

void ossl_config_add_ssl_module(void)

{

    CONF_module_add("ssl_conf", ssl_module_init, ssl_module_free);

}