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
|
/* client-callback.c --- Example SASL client, with callback for user info.
* Copyright (C) 2004-2025 Simon Josefsson
*
* This file is part of GNU SASL.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <config.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <gsasl.h>
static void
client_authenticate (Gsasl_session *session)
{
char buf[BUFSIZ] = "";
char *p;
int rc;
/* This loop mimics a protocol where the server send data first. */
do
{
printf ("Input base64 encoded data from server:\n");
p = fgets (buf, sizeof (buf) - 1, stdin);
if (p == NULL)
{
perror ("fgets");
return;
}
if (buf[strlen (buf) - 1] == '\n')
buf[strlen (buf) - 1] = '\0';
rc = gsasl_step64 (session, buf, &p);
if (rc == GSASL_NEEDS_MORE || rc == GSASL_OK)
{
printf ("Output:\n%s\n", p);
gsasl_free (p);
}
}
while (rc == GSASL_NEEDS_MORE);
printf ("\n");
if (rc != GSASL_OK)
{
printf ("Authentication error (%d): %s\n", rc, gsasl_strerror (rc));
return;
}
/* The client is done. Here you would typically check if the server
let the client in. If not, you could try again. */
printf ("If server accepted us, we're done.\n");
}
static void
client (Gsasl *ctx)
{
Gsasl_session *session;
const char *mech = "SECURID";
int rc;
/* Create new authentication session. */
if ((rc = gsasl_client_start (ctx, mech, &session)) != GSASL_OK)
{
printf ("Cannot initialize client (%d): %s\n", rc, gsasl_strerror (rc));
return;
}
/* Do it. */
client_authenticate (session);
/* Cleanup. */
gsasl_finish (session);
}
static int
callback (Gsasl *ctx, Gsasl_session *sctx, Gsasl_property prop)
{
char buf[BUFSIZ] = "";
int rc = GSASL_NO_CALLBACK;
char *p;
(void) ctx;
/* Get user info from user. */
printf ("Callback invoked, for property %u.\n", prop);
switch (prop)
{
case GSASL_PASSCODE:
printf ("Enter passcode:\n");
p = fgets (buf, sizeof (buf) - 1, stdin);
if (p == NULL)
{
perror ("fgets");
break;
}
buf[strlen (buf) - 1] = '\0';
rc = gsasl_property_set (sctx, GSASL_PASSCODE, buf);
break;
case GSASL_AUTHID:
printf ("Enter username:\n");
p = fgets (buf, sizeof (buf) - 1, stdin);
if (p == NULL)
{
perror ("fgets");
break;
}
buf[strlen (buf) - 1] = '\0';
rc = gsasl_property_set (sctx, GSASL_AUTHID, buf);
break;
default:
printf ("Unknown property! Don't worry.\n");
break;
}
return rc;
}
int
main (void)
{
Gsasl *ctx = NULL;
int rc;
/* Initialize library. */
if ((rc = gsasl_init (&ctx)) != GSASL_OK)
{
printf ("Cannot initialize libgsasl (%d): %s", rc, gsasl_strerror (rc));
return 1;
}
/* Set the callback handler for the library. */
gsasl_callback_set (ctx, callback);
/* Do it. */
client (ctx);
/* Cleanup. */
gsasl_done (ctx);
return 0;
}
|
