Bug Summary

File:src/p11common.c
Location:line 105, column 3
Description:Value stored to 'cache' is never read

Annotated Source Code

1/*
2 * Copyright (C) 2011-2012 Free Software Foundation, Inc.
3 * Author: Nikos Mavrogiannopoulos
4 *
5 * This file is part of GnuTLS.
6 *
7 * GnuTLS is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * GnuTLS is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
19 */
20
21#include <config.h>
22
23#include <getpass.h>
24
25#include <stdio.h>
26#include <stdlib.h>
27#include <string.h>
28#include <gnutls/pkcs11.h>
29#include <p11common.h>
30
31#ifdef ENABLE_PKCS111
32
33#define MIN(x,y)((x)<(y))?(x):(y) ((x)<(y))?(x):(y)
34
35#define MAX_CACHE_TRIES5 5
36static int
37pin_callback (void *user, int attempt, const char *token_url,
38 const char *token_label, unsigned int flags, char *pin,
39 size_t pin_max)
40{
41 const char *password;
42 const char * desc;
43 int len, cache = MAX_CACHE_TRIES5;
44/* allow caching of PIN */
45 static char *cached_url = NULL((void*)0);
46 static char cached_pin[32] = "";
47
48 if (flags & GNUTLS_PKCS11_PIN_SO)
49 desc = "security officer";
50 else
51 desc = "user";
52
53 if (flags & GNUTLS_PKCS11_PIN_FINAL_TRY)
54 {
55 cache = 0;
56 printf ("*** This is the final try before locking!\n");
57 }
58 if (flags & GNUTLS_PKCS11_PIN_COUNT_LOW)
59 {
60 cache = 0;
61 printf ("*** Only few tries left before locking!\n");
62 }
63
64 if (flags & GNUTLS_PKCS11_PIN_WRONG)
65 {
66 cache = 0;
67 printf ("*** Wrong PIN has been provided!\n");
68 }
69
70 if (cache > 0 && cached_url != NULL((void*)0))
71 {
72 if (strcmp (cached_url, token_url) == 0)
73 {
74 if (strlen(pin) >= sizeof(cached_pin))
75 {
76 fprintf (stderrstderr, "Too long PIN given\n");
77 exit (1);
78 }
79
80 fprintf(stderrstderr, "Re-using cached PIN for token '%s'\n", token_label);
81 strcpy (pin, cached_pin);
82 cache--;
83 return 0;
84 }
85 }
86
87 printf ("Token '%s' with URL '%s' ", token_label, token_url);
88 printf ("requires %s PIN\n", desc);
89
90 password = getpass ("Enter PIN: ");
91 if (password == NULL((void*)0) || password[0] == 0)
92 {
93 fprintf (stderrstderr, "No password given\n");
94 exit (1);
95 }
96
97 len = MIN (pin_max, strlen (password))((pin_max)<(strlen (password)))?(pin_max):(strlen (password
));
98 memcpy (pin, password, len);
99 pin[len] = 0;
100
101 /* cache */
102 strcpy (cached_pin, pin);
103 free (cached_url);
104 cached_url = strdup (token_url);
105 cache = MAX_CACHE_TRIES5;
Value stored to 'cache' is never read
106
107 return 0;
108}
109
110static int
111token_callback (void *user, const char *label, const unsigned retry)
112{
113 char buf[32];
114
115 if (retry > 0)
116 {
117 fprintf (stderrstderr, "Could not find token %s\n", label);
118 return -1;
119 }
120 printf ("Please insert token '%s' in slot and press enter\n", label);
121 fgets (buf, sizeof (buf), stdinstdin);
122
123 return 0;
124}
125
126void
127pkcs11_common (void)
128{
129
130 gnutls_pkcs11_set_pin_function (pin_callback, NULL((void*)0));
131 gnutls_pkcs11_set_token_function (token_callback, NULL((void*)0));
132
133}
134
135#endif