/* $OpenBSD: conf_def.c,v 1.45 2025/05/10 05:54:38 tb Exp $ */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

/* Part of the code in here was originally in conf.c, which is now removed */

#include <stdio.h>
#include <string.h>

#include <openssl/buffer.h>
#include <openssl/conf.h>
#include <openssl/lhash.h>
#include <openssl/stack.h>

#include "conf_def.h"
#include "conf_local.h"
#include "err_local.h"

#define MAX_CONF_VALUE_LENGTH 65536

static char *eat_ws(CONF *conf, char *p);
static char *eat_alpha_numeric(CONF *conf, char *p);
static void clear_comments(CONF *conf, char *p);
static int str_copy(CONF *conf, char *section, char **to, char *from);
static char *scan_quote(CONF *conf, char *p);
static char *scan_dquote(CONF *conf, char *p);
#define scan_esc(conf,p)        (((IS_EOF((conf),(p)[1]))?((p)+1):((p)+2)))

static CONF *
def_create(const CONF_METHOD *meth)
{
        CONF *ret;

        ret = calloc(1, sizeof(CONF) + sizeof(unsigned short *));
        if (ret)
                if (meth->init(ret) == 0) {
                        free(ret);
                        ret = NULL;
                }
        return ret;
}

static int
def_init_default(CONF *conf)
{
        if (conf == NULL)
                return 0;

        conf->meth = NCONF_default();
        conf->data = NULL;

        return 1;
}

static int
def_destroy_data(CONF *conf)
{
        if (conf == NULL)
                return 0;
        _CONF_free_data(conf);
        return 1;
}

static int
def_destroy(CONF *conf)
{
        if (def_destroy_data(conf)) {
                free(conf);
                return 1;
        }
        return 0;
}

static int
def_load_bio(CONF *conf, BIO *in, long *line)
{
/* The macro BUFSIZE conflicts with a system macro in VxWorks */
#define CONFBUFSIZE     512
        int bufnum = 0, i, ii;
        BUF_MEM *buff = NULL;
        char *s, *p, *end;
        int again;
        long eline = 0;
        CONF_VALUE *v = NULL, *tv;
        CONF_VALUE *sv = NULL;
        char *section = NULL, *buf;
        char *start, *psection, *pname;
        void *h = (void *)(conf->data);

        if ((buff = BUF_MEM_new()) == NULL) {
                CONFerror(ERR_R_BUF_LIB);
                goto err;
        }

        section = strdup("default");
        if (section == NULL) {
                CONFerror(ERR_R_MALLOC_FAILURE);
                goto err;
        }

        if (_CONF_new_data(conf) == 0) {
                CONFerror(ERR_R_MALLOC_FAILURE);
                goto err;
        }

        sv = _CONF_new_section(conf, section);
        if (sv == NULL) {
                CONFerror(CONF_R_UNABLE_TO_CREATE_NEW_SECTION);
                goto err;
        }

        bufnum = 0;
        again = 0;
        for (;;) {
                if (!BUF_MEM_grow(buff, bufnum + CONFBUFSIZE)) {
                        CONFerror(ERR_R_BUF_LIB);
                        goto err;
                }
                p = &(buff->data[bufnum]);
                *p = '\0';
                BIO_gets(in, p, CONFBUFSIZE - 1);
                p[CONFBUFSIZE - 1] = '\0';
                ii = i = strlen(p);
                if (i == 0 && !again)
                        break;
                again = 0;
                while (i > 0) {
                        if ((p[i - 1] != '\r') && (p[i - 1] != '\n'))
                                break;
                        else
                                i--;
                }
                /* we removed some trailing stuff so there is a new
                 * line on the end. */
                if (ii && i == ii)
                        again = 1; /* long line */
                else {
                        p[i] = '\0';
                        eline++; /* another input line */
                }

                /* we now have a line with trailing \r\n removed */

                /* i is the number of bytes */
                bufnum += i;

                v = NULL;
                /* check for line continuation */
                if (bufnum >= 1) {
                        /* If we have bytes and the last char '\\' and
                         * second last char is not '\\' */
                        p = &(buff->data[bufnum - 1]);
                        if (IS_ESC(conf, p[0]) &&
                            ((bufnum <= 1) || !IS_ESC(conf, p[-1]))) {
                                bufnum--;
                                again = 1;
                        }
                }
                if (again)
                        continue;
                bufnum = 0;
                buf = buff->data;

                clear_comments(conf, buf);
                s = eat_ws(conf, buf);
                if (IS_EOF(conf, *s))
                        continue; /* blank line */
                if (*s == '[') {
                        char *ss;

                        s++;
                        start = eat_ws(conf, s);
                        ss = start;
again:
                        end = eat_alpha_numeric(conf, ss);
                        p = eat_ws(conf, end);
                        if (*p != ']') {
                                if (*p != '\0' && ss != p) {
                                        ss = p;
                                        goto again;
                                }
                                CONFerror(CONF_R_MISSING_CLOSE_SQUARE_BRACKET);
                                goto err;
                        }
                        *end = '\0';
                        if (!str_copy(conf, NULL, &section, start))
                                goto err;
                        if ((sv = _CONF_get_section(conf, section)) == NULL)
                                sv = _CONF_new_section(conf, section);
                        if (sv == NULL) {
                                CONFerror(CONF_R_UNABLE_TO_CREATE_NEW_SECTION);
                                goto err;
                        }
                        continue;
                } else {
                        pname = s;
                        psection = NULL;
                        end = eat_alpha_numeric(conf, s);
                        if ((end[0] == ':') && (end[1] == ':')) {
                                *end = '\0';
                                end += 2;
                                psection = pname;
                                pname = end;
                                end = eat_alpha_numeric(conf, end);
                        }
                        p = eat_ws(conf, end);
                        if (*p != '=') {
                                CONFerror(CONF_R_MISSING_EQUAL_SIGN);
                                goto err;
                        }
                        *end = '\0';
                        p++;
                        start = eat_ws(conf, p);
                        while (!IS_EOF(conf, *p))
                                p++;
                        p--;
                        while ((p != start) && (IS_WS(conf, *p)))
                                p--;
                        p++;
                        *p = '\0';

                        if (!(v = malloc(sizeof(CONF_VALUE)))) {
                                CONFerror(ERR_R_MALLOC_FAILURE);
                                goto err;
                        }
                        if (psection == NULL)
                                psection = section;
                        v->name = strdup(pname);
                        v->value = NULL;
                        if (v->name == NULL) {
                                CONFerror(ERR_R_MALLOC_FAILURE);
                                goto err;
                        }
                        if (!str_copy(conf, psection, &(v->value), start))
                                goto err;

                        if (strcmp(psection, section) != 0) {
                                if ((tv = _CONF_get_section(conf, psection))
                                        == NULL)
                                        tv = _CONF_new_section(conf, psection);
                                if (tv == NULL) {
                                        CONFerror(CONF_R_UNABLE_TO_CREATE_NEW_SECTION);
                                        goto err;
                                }
                        } else
                                tv = sv;

                        if (_CONF_add_string(conf, tv, v) == 0) {
                                CONFerror(ERR_R_MALLOC_FAILURE);
                                goto err;
                        }
                        v = NULL;
                }
        }
        if (buff != NULL)
                BUF_MEM_free(buff);
        free(section);
        return (1);

err:
        if (buff != NULL)
                BUF_MEM_free(buff);
        free(section);
        if (line != NULL)
                *line = eline;
        ERR_asprintf_error_data("line %ld", eline);
        if ((h != conf->data) && (conf->data != NULL)) {
                CONF ctmp;

                CONF_set_nconf(&ctmp, conf->data);
                ctmp.meth->destroy_data(&ctmp);
                conf->data = NULL;
        }
        if (v != NULL) {
                free(v->name);
                free(v->value);
                free(v);
        }
        return (0);
}

static int
def_load(CONF *conf, const char *name, long *line)
{
        int ret;
        BIO *in = NULL;

        in = BIO_new_file(name, "rb");
        if (in == NULL) {
                if (ERR_GET_REASON(ERR_peek_last_error()) == BIO_R_NO_SUCH_FILE)
                        CONFerror(CONF_R_NO_SUCH_FILE);
                else
                        CONFerror(ERR_R_SYS_LIB);
                return 0;
        }

        ret = def_load_bio(conf, in, line);
        BIO_free(in);

        return ret;
}

static void
clear_comments(CONF *conf, char *p)
{
        for (;;) {
                if (IS_FCOMMENT(conf, *p)) {
                        *p = '\0';
                        return;
                }
                if (!IS_WS(conf, *p)) {
                        break;
                }
                p++;
        }

        for (;;) {
                if (IS_COMMENT(conf, *p)) {
                        *p = '\0';
                        return;
                }
                if (IS_DQUOTE(conf, *p)) {
                        p = scan_dquote(conf, p);
                        continue;
                }
                if (IS_QUOTE(conf, *p)) {
                        p = scan_quote(conf, p);
                        continue;
                }
                if (IS_ESC(conf, *p)) {
                        p = scan_esc(conf, p);
                        continue;
                }
                if (IS_EOF(conf, *p))
                        return;
                else
                        p++;
        }
}

static int
str_copy(CONF *conf, char *section, char **pto, char *from)
{
        int q, r,rr = 0, to = 0, len = 0;
        char *s, *e, *rp, *p, *rrp, *np, *cp, v;
        size_t newsize;
        BUF_MEM *buf;

        if ((buf = BUF_MEM_new()) == NULL)
                return (0);

        len = strlen(from) + 1;
        if (!BUF_MEM_grow(buf, len))
                goto err;

        for (;;) {
                if (IS_QUOTE(conf, *from)) {
                        q = *from;
                        from++;
                        while (!IS_EOF(conf, *from) && (*from != q)) {
                                if (IS_ESC(conf, *from)) {
                                        from++;
                                        if (IS_EOF(conf, *from))
                                                break;
                                }
                                buf->data[to++] = *(from++);
                        }
                        if (*from == q)
                                from++;
                } else if (IS_DQUOTE(conf, *from)) {
                        q = *from;
                        from++;
                        while (!IS_EOF(conf, *from)) {
                                if (*from == q) {
                                        if (*(from + 1) == q) {
                                                from++;
                                        } else {
                                                break;
                                        }
                                }
                                buf->data[to++] = *(from++);
                        }
                        if (*from == q)
                                from++;
                } else if (IS_ESC(conf, *from)) {
                        from++;
                        v = *(from++);
                        if (IS_EOF(conf, v))
                                break;
                        else if (v == 'r')
                                v = '\r';
                        else if (v == 'n')
                                v = '\n';
                        else if (v == 'b')
                                v = '\b';
                        else if (v == 't')
                                v = '\t';
                        buf->data[to++] = v;
                } else if (IS_EOF(conf, *from))
                        break;
                else if (*from == '$') {
                        /* try to expand it */
                        rrp = NULL;
                        s = &(from[1]);
                        if (*s == '{')
                                q = '}';
                        else if (*s == '(')
                                q = ')';
                        else
                                q = 0;

                        if (q)
                                s++;
                        cp = section;
                        e = np = s;
                        while (IS_ALPHA_NUMERIC(conf, *e))
                                e++;
                        if ((e[0] == ':') && (e[1] == ':')) {
                                cp = np;
                                rrp = e;
                                rr = *e;
                                *rrp = '\0';
                                e += 2;
                                np = e;
                                while (IS_ALPHA_NUMERIC(conf, *e))
                                        e++;
                        }
                        r = *e;
                        *e = '\0';
                        rp = e;
                        if (q) {
                                if (r != q) {
                                        CONFerror(CONF_R_NO_CLOSE_BRACE);
                                        goto err;
                                }
                                e++;
                        }
                        /* So at this point we have
                         * np which is the start of the name string which is
                         *   '\0' terminated.
                         * cp which is the start of the section string which is
                         *   '\0' terminated.
                         * e is the 'next point after'.
                         * r and rr are the chars replaced by the '\0'
                         * rp and rrp is where 'r' and 'rr' came from.
                         */
                        p = _CONF_get_string(conf, cp, np);
                        if (rrp != NULL)
                                *rrp = rr;
                        *rp = r;
                        if (p == NULL) {
                                CONFerror(CONF_R_VARIABLE_HAS_NO_VALUE);
                                goto err;
                        }
                        newsize = strlen(p) + buf->length - (e - from);
                        if (newsize > MAX_CONF_VALUE_LENGTH) {
                                CONFerror(CONF_R_VARIABLE_EXPANSION_TOO_LONG);
                                goto err;
                        }
                        if (!BUF_MEM_grow_clean(buf, newsize)) {
                                CONFerror(CONF_R_MODULE_INITIALIZATION_ERROR);
                                goto err;
                        }
                        while (*p)
                                buf->data[to++] = *(p++);

                        /* Since we change the pointer 'from', we also have
                           to change the perceived length of the string it
                           points at.  /RL */
                        len -= e - from;
                        from = e;

                        /* In case there were no braces or parenthesis around
                           the variable reference, we have to put back the
                           character that was replaced with a '\0'.  /RL */
                        *rp = r;
                } else
                        buf->data[to++] = *(from++);
        }
        buf->data[to]='\0';
        free(*pto);
        *pto = buf->data;
        free(buf);
        return (1);

err:
        if (buf != NULL)
                BUF_MEM_free(buf);
        return (0);
}

static char *
eat_ws(CONF *conf, char *p)
{
        while (IS_WS(conf, *p) && (!IS_EOF(conf, *p)))
                p++;
        return (p);
}

static char *
eat_alpha_numeric(CONF *conf, char *p)
{
        for (;;) {
                if (IS_ESC(conf, *p)) {
                        p = scan_esc(conf, p);
                        continue;
                }
                if (!IS_ALPHA_NUMERIC_PUNCT(conf, *p))
                        return (p);
                p++;
        }
}

static char *
scan_quote(CONF *conf, char *p)
{
        int q = *p;

        p++;
        while (!(IS_EOF(conf, *p)) && (*p != q)) {
                if (IS_ESC(conf, *p)) {
                        p++;
                        if (IS_EOF(conf, *p))
                                return (p);
                }
                p++;
        }
        if (*p == q)
                p++;
        return (p);
}


static char *
scan_dquote(CONF *conf, char *p)
{
        int q = *p;

        p++;
        while (!(IS_EOF(conf, *p))) {
                if (*p == q) {
                        if (*(p + 1) == q) {
                                p++;
                        } else {
                                break;
                        }
                }
                p++;
        }
        if (*p == q)
                p++;
        return (p);
}

static void
dump_value_doall_arg(CONF_VALUE *a, BIO *out)
{
        if (a->name)
                BIO_printf(out, "[%s] %s=%s\n", a->section, a->name, a->value);
        else
                BIO_printf(out, "[[%s]]\n", a->section);
}

static IMPLEMENT_LHASH_DOALL_ARG_FN(dump_value, CONF_VALUE, BIO)

static int
def_dump(const CONF *conf, BIO *out)
{
        lh_CONF_VALUE_doall_arg(conf->data, LHASH_DOALL_ARG_FN(dump_value),
            BIO, out);
        return 1;
}

static int
def_is_number(const CONF *conf, char c)
{
        return IS_NUMBER(conf, c);
}

static int
def_to_int(const CONF *conf, char c)
{
        return c - '0';
}

static const CONF_METHOD default_method = {
        .name = "OpenSSL default",
        .create = def_create,
        .init = def_init_default,
        .destroy = def_destroy,
        .destroy_data = def_destroy_data,
        .load_bio = def_load_bio,
        .dump = def_dump,
        .is_number = def_is_number,
        .to_int = def_to_int,
        .load = def_load,
};

const CONF_METHOD *
NCONF_default(void)
{
        return &default_method;
}