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
|
/*
This file is part of TALER
Copyright (C) 2014, 2015, 2016 Inria & GNUnet e.V.
TALER 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, or (at your option) any later version.
TALER 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
TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file exchangedb/exchangedb_signkeys.c
* @brief I/O operations for the Exchange's private online signing keys
* @author Florian Dold
* @author Benedikt Mueller
* @author Sree Harsha Totakura
* @author Christian Grothoff
*/
#include "platform.h"
#include "taler_exchangedb_lib.h"
/**
* Closure for the #signkeys_iterate_dir_iter().
*/
struct SignkeysIterateContext
{
/**
* Function to call on each signing key.
*/
TALER_EXCHANGEDB_SigningKeyIterator it;
/**
* Closure for @e it.
*/
void *it_cls;
};
/**
* Function called on each file in the directory with our signing
* keys. Parses the file and calls the iterator from @a cls.
*
* @param cls the `struct SignkeysIterateContext *`
* @param filename name of the file to parse
* @return #GNUNET_OK to continue,
* #GNUNET_NO to stop iteration without error,
* #GNUNET_SYSERR to stop iteration with error
*/
static int
signkeys_iterate_dir_iter (void *cls,
const char *filename)
{
struct SignkeysIterateContext *skc = cls;
ssize_t nread;
struct TALER_EXCHANGEDB_PrivateSigningKeyInformationP issue;
nread = GNUNET_DISK_fn_read (filename,
&issue,
sizeof (struct TALER_EXCHANGEDB_PrivateSigningKeyInformationP));
if (nread != sizeof (struct TALER_EXCHANGEDB_PrivateSigningKeyInformationP))
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"Invalid signkey file `%s': wrong size (%d, expected %u)\n",
filename,
(int) nread,
(unsigned int) sizeof (struct TALER_EXCHANGEDB_PrivateSigningKeyInformationP));
return GNUNET_OK;
}
return skc->it (skc->it_cls,
filename,
&issue);
}
/**
* Call @a it for each signing key found in the @a exchange_base_dir.
*
* @param exchange_base_dir base directory for the exchange,
* the signing keys must be in the #TALER_EXCHANGEDB_DIR_SIGNING_KEYS
* subdirectory
* @param it function to call on each signing key
* @param it_cls closure for @a it
* @return number of files found (may not match
* number of keys given to @a it as malformed
* files are simply skipped), -1 on error
*/
int
TALER_EXCHANGEDB_signing_keys_iterate (const char *exchange_base_dir,
TALER_EXCHANGEDB_SigningKeyIterator it,
void *it_cls)
{
char *signkey_dir;
struct SignkeysIterateContext skc;
int ret;
GNUNET_asprintf (&signkey_dir,
"%s" DIR_SEPARATOR_STR TALER_EXCHANGEDB_DIR_SIGNING_KEYS,
exchange_base_dir);
skc.it = it;
skc.it_cls = it_cls;
ret = GNUNET_DISK_directory_scan (signkey_dir,
&signkeys_iterate_dir_iter,
&skc);
GNUNET_free (signkey_dir);
return ret;
}
/**
* Obtain the name of the directory we use to store signing
* keys created at time @a start.
*
* @param start time at which we create the signing key
* @return name of the directory we should use, basically "$EXCHANGEDIR/$TIME/";
* (valid until next call to this function)
*/
static char *
get_signkey_file (const char *exchange_directory,
struct GNUNET_TIME_Absolute start)
{
char *dir;
GNUNET_asprintf (&dir,
"%s" DIR_SEPARATOR_STR TALER_EXCHANGEDB_DIR_SIGNING_KEYS DIR_SEPARATOR_STR "%llu",
exchange_directory,
(unsigned long long) start.abs_value_us);
return dir;
}
/**
* Exports a signing key to the given file.
*
* @param exchange_base_dir base directory for the keys
* @param start start time of the validity for the key
* @param ski the signing key
* @return #GNUNET_OK upon success; #GNUNET_SYSERR upon failure.
*/
int
TALER_EXCHANGEDB_signing_key_write (const char *exchange_base_dir,
struct GNUNET_TIME_Absolute start,
const struct TALER_EXCHANGEDB_PrivateSigningKeyInformationP *ski)
{
char *skf;
ssize_t nwrite;
skf = get_signkey_file (exchange_base_dir,
start);
if (GNUNET_OK !=
GNUNET_DISK_directory_create_for_file (skf))
return GNUNET_SYSERR;
nwrite = GNUNET_DISK_fn_write (skf,
ski,
sizeof (struct TALER_EXCHANGEDB_PrivateSigningKeyInformationP),
GNUNET_DISK_PERM_USER_WRITE | GNUNET_DISK_PERM_USER_READ);
if (sizeof (struct TALER_EXCHANGEDB_PrivateSigningKeyInformationP) != nwrite)
{
GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR,
"write",
skf);
GNUNET_free (skf);
return GNUNET_SYSERR;
}
GNUNET_free (skf);
return GNUNET_OK;
}
/* end of exchangedb_signkeys.c */
|
