1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
|
/*
* 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 "parse.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 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 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(nss);
}
handle = malloc(sizeof(*handle));
if (handle != NULL) {
handle->fp = open_sudoers(sudoers_file, &outfile, false, NULL);
if (handle->fp != NULL) {
init_parse_tree(&handle->parse_tree, NULL, NULL, 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(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_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(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(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
};
|
