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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2004-2005, 2007-2022 Todd C. Miller <Todd.Miller@sudo.ws>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <sudoers.h>
#include <sudo_lbuf.h>
#include <gram.h>
struct sudo_file_handle {
FILE *fp;
struct sudoers_parse_tree parse_tree;
};
static int
sudo_file_close(struct sudoers_context *ctx, struct sudo_nss *nss)
{
debug_decl(sudo_file_close, SUDOERS_DEBUG_NSS);
struct sudo_file_handle *handle = nss->handle;
if (handle != NULL) {
fclose(handle->fp);
sudoersin = NULL;
free_parse_tree(&handle->parse_tree);
free(handle);
nss->handle = NULL;
}
debug_return_int(0);
}
static int
sudo_file_open(struct sudoers_context *ctx, struct sudo_nss *nss)
{
debug_decl(sudo_file_open, SUDOERS_DEBUG_NSS);
struct sudo_file_handle *handle;
char *outfile = NULL;
/* Note: relies on defaults being initialized early. */
if (def_ignore_local_sudoers)
debug_return_int(-1);
if (nss->handle != NULL) {
sudo_debug_printf(SUDO_DEBUG_ERROR,
"%s: called with non-NULL handle %p", __func__, nss->handle);
sudo_file_close(ctx, nss);
}
handle = malloc(sizeof(*handle));
if (handle != NULL) {
init_parser(ctx, NULL);
handle->fp = open_sudoers(ctx->parser_conf.sudoers_path, &outfile,
false, NULL);
if (handle->fp != NULL) {
init_parse_tree(&handle->parse_tree, NULL, NULL, ctx, nss);
if (outfile != NULL) {
/* Update path to open sudoers file. */
sudo_rcstr_delref(sudoers);
sudoers = outfile;
}
} else {
free(handle);
handle = NULL;
}
}
nss->handle = handle;
debug_return_int(nss->handle ? 0 : -1);
}
/*
* Parse and return the specified sudoers file.
*/
static struct sudoers_parse_tree *
sudo_file_parse(struct sudoers_context *ctx, const struct sudo_nss *nss)
{
debug_decl(sudo_file_close, SUDOERS_DEBUG_NSS);
struct sudo_file_handle *handle = nss->handle;
int error;
if (handle == NULL || handle->fp == NULL) {
sudo_debug_printf(SUDO_DEBUG_ERROR, "%s: called with NULL %s",
__func__, handle ? "file pointer" : "handle");
debug_return_ptr(NULL);
}
sudoersin = handle->fp;
error = sudoersparse();
if (error || (parse_error && !sudoers_error_recovery())) {
/* unrecoverable error */
debug_return_ptr(NULL);
}
/* Move parsed sudoers policy to nss handle. */
reparent_parse_tree(&handle->parse_tree);
debug_return_ptr(&handle->parse_tree);
}
/*
* No need for explicit sudoers queries, the parse function handled it.
*/
static int
sudo_file_query(struct sudoers_context *ctx, const struct sudo_nss *nss,
struct passwd *pw)
{
debug_decl(sudo_file_query, SUDOERS_DEBUG_NSS);
debug_return_int(0);
}
/*
* No need to get defaults for sudoers file, the parse function handled it.
*/
static int
sudo_file_getdefs(struct sudoers_context *ctx, const struct sudo_nss *nss)
{
debug_decl(sudo_file_getdefs, SUDOERS_DEBUG_NSS);
debug_return_int(0);
}
/* sudo_nss implementation */
struct sudo_nss sudo_nss_file = {
{ NULL, NULL },
"sudoers",
sudo_file_open,
sudo_file_close,
sudo_file_parse,
sudo_file_query,
sudo_file_getdefs
};
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