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
181
182
183
184
185
186
187
188
189
190
191
192
|
/* parse_certificate_files.c -- Parses PEM or PKCS12 formated cert. files
*
* GPLv2 only - Copyright (C) 2008, 2009
* David Sommerseth <dazo@users.sourceforge.net>
*
* 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; version 2
* of the License.
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#ifdef HAVE_OPENSSL
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <openssl/ssl.h>
#include <openssl/pkcs12.h>
#include <openssl/evp.h>
#include <openssl/err.h>
#include <eurephia_nullsafe.h>
#include <certinfo.h>
#include "get_console_input.h"
#define _PARSE_CERTFICIATE_FILES_C
#include "parse_certificate_files.h"
char *ExtractCertInfo(const char *module, X509 *cert, const char *fieldname) {
unsigned char *buf = (unsigned char *)1; // Needs to be 1 to avoid OpenSSL 0.9.6b bug
char resbuf[2050];
X509_NAME *name = NULL;
X509_NAME_ENTRY *namentry = NULL;
ASN1_STRING *asn1 = NULL;
int nid, tmp = -1, pos = -1;
//
// Extract subject information
//
memset(resbuf, 0, 2050);
nid = OBJ_txt2nid(fieldname);
name = X509_get_subject_name(cert);
do {
pos = tmp;
tmp = X509_NAME_get_index_by_NID(name, nid, pos);
} while ( tmp > -1 );
if( pos == -1 ) {
fprintf(stderr, "%s: Field '%s' not found\n", module, fieldname);
return 0;
}
if( !(namentry = X509_NAME_get_entry(name, pos)) ) {
fprintf(stderr, "%s: Failed to extract name entry from field '%s'\n", module, fieldname);
return 0;
}
if( !(asn1 = X509_NAME_ENTRY_get_data(namentry)) ) {
fprintf(stderr, "%s: Failed to extract data from name entry field '%s'\n", module, fieldname);
return 0;
}
if( ASN1_STRING_to_UTF8(&buf, asn1) <= 0 ) {
fprintf(stderr, "%s: Failed to convert ASN1 string to UTF-8 for '%s'\n", module, fieldname);
return 0;
}
snprintf(resbuf, 2048, "%s%c", buf, '\0');
OPENSSL_free(buf);
return strdup_nullsafe(resbuf);
}
certinfo *_Cert_ParseFile(const char *module, const char *certfile, int certfile_format) {
BIO *bio_err = NULL;
PKCS12 *p12 = NULL;
EVP_PKEY *pkey = NULL;
X509 *cert = NULL;
FILE *fp;
certinfo *ret = NULL;
/* Needed to convert X509 digest into hex string */
unsigned char md_sha1[EVP_MAX_MD_SIZE];
unsigned int mdlen;
if( !bio_err ) {
SSL_library_init();
SSL_load_error_strings();
bio_err = BIO_new_fp(stderr, BIO_NOCLOSE);
}
// Open file - according to defined format
switch( certfile_format ) {
case CERTFILE_PEM: // PEM/DER format
fp = fopen(certfile, "r");
if( !(cert = PEM_read_X509(fp, NULL, NULL, NULL)) ) {
fprintf(stderr, "%s: Failed to open certificate file\n", module);
return NULL;
}
fclose(fp);
break;
case CERTFILE_PKCS12: // PKCS#12 format
fp = fopen(certfile, "r");
p12 = d2i_PKCS12_fp(fp, NULL);
fclose(fp);
if( p12 == NULL ) {
fprintf(stderr, "%s: Could not open PKCS#12 file\n", module);
return NULL;
}
OpenSSL_add_all_ciphers();
// First, try without password
if( !PKCS12_parse(p12, "", &pkey, &cert, NULL) ) {
char pwd[130];
// If empty password failed, get password and try again
memset(&pwd, 0, 130);
if( get_console_input(pwd, 128, "PKCS12 password:", 1) < 0 ) {
fprintf(stderr, "Could not retrieve password\n");
}
if( !PKCS12_parse(p12, pwd, &pkey, &cert, NULL) ) {
PKCS12_free(p12); p12 = NULL;
fprintf(stderr,
"%s: Could not open PKCS#12 file - wrong password\n", module);
fprintf(stderr,
"%s: %s\n", module, ERR_error_string(ERR_get_error(), NULL));
BIO_free(bio_err);
return NULL;
}
}
EVP_PKEY_free(pkey); pkey = NULL;
PKCS12_free(p12); p12 = NULL;
break;
default: // Unknown
fprintf(stderr, "%s: Unknown certificate file format\n", module);
return NULL;
}
ret = (certinfo *) malloc(sizeof(certinfo)+2);
assert( ret != NULL );
memset(ret, 0, sizeof(certinfo)+2);
ret->digest = (char *) malloc(66);
assert(ret != NULL);
memset(ret->digest, 0, 66);
// extract SHA1 digest from certificate
if (X509_digest(cert, EVP_sha1(), md_sha1, &mdlen) && mdlen > 0) {
static const char hexcodes[] = "0123456789ABCDEF";
int j;
for (j = 0; j < (int) mdlen; j++) {
ret->digest[j * 3] = hexcodes[(md_sha1[j] & 0xf0) >> 4U];
ret->digest[(j * 3) + 1] = hexcodes[(md_sha1[j] & 0x0f)];
if (j + 1 != (int) mdlen) {
ret->digest[(j * 3) + 2] = ':';
} else {
ret->digest[(j * 3) + 2] = '\0';
}
}
}
// Extract the subject information we want
ret->common_name = ExtractCertInfo(module, cert, "CN");
ret->org = ExtractCertInfo(module, cert, "O");
ret->email = ExtractCertInfo(module, cert, "emailAddress");
X509_free(cert);
BIO_free(bio_err);
return ret;
}
#endif
|
