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
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
/**
* @file pkcs10.c
* @brief Functions to build PKCS#10 requests
*
* Contains functions to build DER encoded pkcs#10 certificate requests
*/
/* Copyright (C) 2005 Jan Hutter, Martin Willi
* Hochschule fuer Technik Rapperswil
*
* 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 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*/
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <freeswan.h>
#include <asn1/oid.h>
#include "../pluto/constants.h"
#include "../pluto/defs.h"
#include "../pluto/asn1.h"
#include "../pluto/pkcs1.h"
#include "../pluto/log.h"
#include "../pluto/x509.h"
#include "pkcs10.h"
/* some pre-coded OIDs */
static u_char ASN1_challengePassword_oid_str[] = {
0x06,0x09, 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x01, 0x09, 0x07
};
static const chunk_t ASN1_challengePassword_oid = strchunk(ASN1_challengePassword_oid_str);
static u_char ASN1_extensionRequest_oid_str[] = {
0x06, 0x09, 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x01, 0x09, 0x0E
};
static const chunk_t ASN1_extensionRequest_oid = strchunk(ASN1_extensionRequest_oid_str);
/**
* @brief Adds a subjectAltName in DER-coded form to a linked list
*
* @param[in,out] subjectAltNames head of the linked list of subjectAltNames
* @param[in] kind type of the subjectAltName (which is a generalName)
* @param[in] value value of the subjectAltName as an ASCII string
*/
void
pkcs10_add_subjectAltName(generalName_t **subjectAltNames, generalNames_t kind
, char *value)
{
generalName_t *gn;
asn1_t asn1_type = ASN1_EOC;
chunk_t name = { value, strlen(value) };
switch (kind)
{
case GN_RFC822_NAME:
asn1_type = ASN1_CONTEXT_S_1;
break;
case GN_DNS_NAME:
asn1_type = ASN1_CONTEXT_S_2;
break;
case GN_IP_ADDRESS:
{
struct in_addr addr;
/* convert an ASCII dotted IPv4 address (e.g. 123.456.78.90)
* to a byte representation in network order
*/
if (!inet_aton(value, &addr))
{
fprintf(stderr, "error in IPv4 subjectAltName\n");
return;
}
asn1_type = ASN1_CONTEXT_S_7;
name.ptr = (u_char *) &addr.s_addr;
name.len = sizeof(addr.s_addr);
break;
}
default:
break;
}
gn = alloc_thing(generalName_t, "subjectAltName");
gn->kind = kind;
gn->name = asn1_simple_object(asn1_type, name);
gn->next = *subjectAltNames;
*subjectAltNames = gn;
}
/**
* @brief Builds the requestInfoAttributes of the certificationRequestInfo-field
*
* challenge password ans subjectAltNames are only included,
* when avaiable in given #pkcs10_t structure
*
* @param[in] pkcs10 Pointer to a #pkcs10_t structure
* @return 1 if succeeded, 0 otherwise
*/
static chunk_t
build_req_info_attributes(pkcs10_t* pkcs10)
{
chunk_t subjectAltNames = empty_chunk;
chunk_t challengePassword = empty_chunk;
if (pkcs10->subjectAltNames != NULL)
{
subjectAltNames = asn1_wrap(ASN1_SEQUENCE, "cm"
, ASN1_extensionRequest_oid
, asn1_wrap(ASN1_SET, "m"
, asn1_wrap(ASN1_SEQUENCE, "m"
, build_subjectAltNames(pkcs10->subjectAltNames)
)
)
);
}
if (pkcs10->challengePassword.len > 0)
{
asn1_t type = is_printablestring(pkcs10->challengePassword)
? ASN1_PRINTABLESTRING : ASN1_T61STRING;
challengePassword = asn1_wrap(ASN1_SEQUENCE, "cm"
, ASN1_challengePassword_oid
, asn1_wrap(ASN1_SET, "m"
, asn1_simple_object(type, pkcs10->challengePassword)
)
);
}
return asn1_wrap(ASN1_CONTEXT_C_0, "mm"
, subjectAltNames
, challengePassword);
}
/**
* @brief Builds a DER-code pkcs#10 certificate request
*
* @param[in] pkcs10 pointer to a pkcs10_t struct
* @return DER-code pkcs10 request
*/
static chunk_t
pkcs10_build_request(pkcs10_t *pkcs10, int signature_alg)
{
RSA_public_key_t *rsak = (RSA_public_key_t *) pkcs10->private_key;
chunk_t cert_req_info = asn1_wrap(ASN1_SEQUENCE, "ccmm"
, ASN1_INTEGER_0
, pkcs10->subject
, pkcs1_build_publicKeyInfo(rsak)
, build_req_info_attributes(pkcs10));
chunk_t signature = pkcs1_build_signature(cert_req_info
, signature_alg, pkcs10->private_key, TRUE);
return asn1_wrap(ASN1_SEQUENCE, "mcm"
, cert_req_info
, asn1_algorithmIdentifier(signature_alg)
, signature);
}
/**
* @brief Creates a pkcs#10 certificate request object
*
* To create a certificate request, the RSA key and the
* names to be included as subject in the certificate request
* (e.g. commonName, organization) are needed. An optional challenge
* password or some subjectAltNames may be included.
*
* @param[in] key rsakey of type #rsakey_t
* @param[in] subject DER-coded subject distinguished name
* @param[in] challengePassword challenge password or empty_chunk
* @param[in] subjectAltNames linked list of subjectAltNames or NULL
* @return pointer to a #pkcs10_t object
*/
pkcs10_t*
pkcs10_build(RSA_private_key_t *key, chunk_t subject, chunk_t challengePassword
, generalName_t *subjectAltNames, int signature_alg)
{
pkcs10_t *pkcs10 = alloc_thing(pkcs10_t, "pkcs10_t");
pkcs10->subject = subject;
pkcs10->private_key = key;
pkcs10->challengePassword = challengePassword;
pkcs10->subjectAltNames = subjectAltNames;
pkcs10->request = pkcs10_build_request(pkcs10, signature_alg);
return pkcs10;
}
/**
* @brief Frees the resources used by an #pkcs10_t object
*
* @param[in] pkcs10 #pkcs10_t to free
*/
void
pkcs10_free(pkcs10_t *pkcs10)
{
if (pkcs10 != NULL)
{
freeanychunk(pkcs10->request);
pfree(pkcs10);
}
}
|
