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
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
|
/*
* Copyright (c) 1999 Todd C. Miller <Todd.Miller@courtesan.com>
* All rights reserved.
*
* 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 above 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 4. Products derived from this software may not be called "Sudo" nor
* may "Sudo" appear in their names without specific prior written
* permission from the author.
*
* THIS SOFTWARE IS PROVIDED ``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 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.
*/
#include "config.h"
#include <stdio.h>
#ifdef STDC_HEADERS
#include <stdlib.h>
#endif /* STDC_HEADERS */
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif /* HAVE_UNISTD_H */
#ifdef HAVE_STRING_H
#include <string.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif /* HAVE_STRINGS_H */
#include <sys/param.h>
#include <sys/types.h>
#include <pwd.h>
#include <security/pam_appl.h>
#include "sudo.h"
#include "sudo_auth.h"
#ifndef lint
static const char rcsid[] = "$Sudo: pam.c,v 1.15 2000/02/27 03:49:06 millert Exp $";
#endif /* lint */
static int sudo_conv __P((int, PAM_CONST struct pam_message **,
struct pam_response **, VOID *));
static char *def_prompt;
int
pam_init(pw, promptp, auth)
struct passwd *pw;
char **promptp;
sudo_auth *auth;
{
static struct pam_conv pam_conv;
pam_handle_t *pamh;
/* Initial PAM setup */
pam_conv.conv = sudo_conv;
if (pam_start("sudo", pw->pw_name, &pam_conv, &pamh) != PAM_SUCCESS) {
log_error(USE_ERRNO|NO_EXIT|NO_MAIL,
"unable to initialize PAM");
return(AUTH_FATAL);
}
auth->data = (VOID *) pamh;
return(AUTH_SUCCESS);
}
int
pam_verify(pw, prompt, auth)
struct passwd *pw;
char *prompt;
sudo_auth *auth;
{
int error;
const char *s;
pam_handle_t *pamh = (pam_handle_t *) auth->data;
def_prompt = prompt; /* for sudo_conv */
/* PAM_SILENT prevents error messages from going to syslog(3) */
if ((error = pam_authenticate(pamh, PAM_SILENT)) == PAM_SUCCESS)
return(AUTH_SUCCESS);
/* Any error other than PAM_AUTH_ERR or PAM_MAXTRIES is probably fatal. */
if (error != PAM_AUTH_ERR && error != PAM_MAXTRIES) {
if ((s = pam_strerror(pamh, error)))
log_error(NO_EXIT|NO_MAIL, "pam_authenticate: %s\n", s);
return(AUTH_FATAL);
}
return(AUTH_FAILURE);
}
int
pam_cleanup(pw, auth)
struct passwd *pw;
sudo_auth *auth;
{
pam_handle_t *pamh = (pam_handle_t *) auth->data;
if (pam_end(pamh, (auth->status == AUTH_SUCCESS)) == PAM_SUCCESS)
return(AUTH_SUCCESS);
else
return(AUTH_FAILURE);
}
/*
* ``Conversation function'' for PAM.
*/
static int
sudo_conv(num_msg, msg, response, appdata_ptr)
int num_msg;
PAM_CONST struct pam_message **msg;
struct pam_response **response;
VOID *appdata_ptr;
{
struct pam_response *pr;
PAM_CONST struct pam_message *pm;
const char *p = def_prompt;
extern int nil_pw;
if ((*response = malloc(num_msg * sizeof(struct pam_response))) == NULL)
return(PAM_CONV_ERR);
(void) memset((VOID *)*response, 0, num_msg * sizeof(struct pam_response));
for (pr = *response, pm = *msg; num_msg--; pr++, pm++) {
switch (pm->msg_style) {
case PAM_PROMPT_ECHO_ON:
tgetpass_flags |= TGP_ECHO;
case PAM_PROMPT_ECHO_OFF:
/* Only override PAM prompt if it matches /^Password: ?/ */
if (strncmp(pm->msg, "Password:", 9) || (pm->msg[9] != '\0'
&& (pm->msg[9] != ' ' || pm->msg[10] != '\0')))
p = pm->msg;
/* Read the password. */
pr->resp = estrdup((char *) tgetpass(p,
def_ival(I_PW_TIMEOUT) * 60, tgetpass_flags));
if (*pr->resp == '\0')
nil_pw = 1; /* empty password */
break;
case PAM_TEXT_INFO:
if (pm->msg)
(void) puts(pm->msg);
break;
case PAM_ERROR_MSG:
if (pm->msg) {
(void) fputs(pm->msg, stderr);
(void) fputc('\n', stderr);
}
break;
default:
/* Something odd happened */
/* XXX - should free non-NULL response members */
free(*response);
*response = NULL;
return(PAM_CONV_ERR);
break;
}
}
return(PAM_SUCCESS);
}
|
