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
|
/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 1999-2005, 2010-2015 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.
*
* Sponsored in part by the Defense Advanced Research Projects
* Agency (DARPA) and Air Force Research Laboratory, Air Force
* Materiel Command, USAF, under agreement number F39502-99-1-0512.
*/
/*
* 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 <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <pwd.h>
#include <sudoers.h>
#include "sudo_auth.h"
#define DESLEN 13
#define HAS_AGEINFO(p, l) (l == 18 && p[DESLEN] == ',')
int
sudo_passwd_init(const struct sudoers_context *ctx, struct passwd *pw,
sudo_auth *auth)
{
debug_decl(sudo_passwd_init, SUDOERS_DEBUG_AUTH);
/* Only initialize once. */
if (auth->data != NULL)
debug_return_int(AUTH_SUCCESS);
#ifdef HAVE_SKEYACCESS
if (skeyaccess(pw, ctx->user.tty, NULL, NULL) == 0)
debug_return_int(AUTH_FAILURE);
#endif
sudo_setspent();
auth->data = sudo_getepw(pw);
sudo_endspent();
debug_return_int(auth->data ? AUTH_SUCCESS : AUTH_ERROR);
}
#ifdef HAVE_CRYPT
int
sudo_passwd_verify(const struct sudoers_context *ctx, struct passwd *pw,
const char *pass, sudo_auth *auth, struct sudo_conv_callback *callback)
{
char des_pass[9], *epass;
char *pw_epasswd = auth->data;
size_t pw_len;
int ret;
debug_decl(sudo_passwd_verify, SUDOERS_DEBUG_AUTH);
/* An empty plain-text password must match an empty encrypted password. */
if (pass[0] == '\0')
debug_return_int(pw_epasswd[0] ? AUTH_FAILURE : AUTH_SUCCESS);
/*
* Truncate to 8 chars if standard DES since not all crypt()'s do this.
*/
pw_len = strlen(pw_epasswd);
if (pw_len == DESLEN || HAS_AGEINFO(pw_epasswd, pw_len)) {
(void)strlcpy(des_pass, pass, sizeof(des_pass));
pass = des_pass;
}
/*
* Normal UN*X password check.
* HP-UX may add aging info (separated by a ',') at the end so
* only compare the first DESLEN characters in that case.
*/
epass = (char *) crypt(pass, pw_epasswd);
ret = AUTH_FAILURE;
if (epass != NULL) {
if (HAS_AGEINFO(pw_epasswd, pw_len) && strlen(epass) == DESLEN) {
if (strncmp(pw_epasswd, epass, DESLEN) == 0)
ret = AUTH_SUCCESS;
} else {
if (strcmp(pw_epasswd, epass) == 0)
ret = AUTH_SUCCESS;
}
}
explicit_bzero(des_pass, sizeof(des_pass));
debug_return_int(ret);
}
#else
int
sudo_passwd_verify(const struct sudoers_context *ctx, struct passwd *pw,
const char *pass, sudo_auth *auth, struct sudo_conv_callback *callback)
{
char *pw_passwd = auth->data;
int ret;
debug_decl(sudo_passwd_verify, SUDOERS_DEBUG_AUTH);
/* Simple string compare for systems without crypt(). */
if (strcmp(pass, pw_passwd) == 0)
ret = AUTH_SUCCESS;
else
ret = AUTH_FAILURE;
debug_return_int(ret);
}
#endif
int
sudo_passwd_cleanup(const struct sudoers_context *ctx, struct passwd *pw,
sudo_auth *auth, bool force)
{
debug_decl(sudo_passwd_cleanup, SUDOERS_DEBUG_AUTH);
if (auth->data != NULL) {
/* Zero out encrypted password before freeing. */
size_t len = strlen((char *)auth->data);
freezero(auth->data, len);
auth->data = NULL;
}
debug_return_int(AUTH_SUCCESS);
}
|
