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
|
/*
* Copyright 2020-2022 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
/*
* RSA low level APIs are deprecated for public use, but still ok for
* internal use.
*/
#include "internal/deprecated.h"
#include <string.h>
#include <openssl/core_dispatch.h>
#include <openssl/core_names.h>
#include <openssl/core_object.h>
#include <openssl/crypto.h>
#include <openssl/err.h>
#include <openssl/params.h>
#include <openssl/pem.h>
#include <openssl/proverr.h>
#include "internal/nelem.h"
#include "prov/bio.h"
#include "prov/implementations.h"
#include "endecoder_local.h"
static int read_pem(PROV_CTX *provctx, OSSL_CORE_BIO *cin,
char **pem_name, char **pem_header,
unsigned char **data, long *len)
{
BIO *in = ossl_bio_new_from_core_bio(provctx, cin);
int ok;
if (in == NULL)
return 0;
ok = (PEM_read_bio(in, pem_name, pem_header, data, len) > 0);
BIO_free(in);
return ok;
}
static OSSL_FUNC_decoder_newctx_fn pem2der_newctx;
static OSSL_FUNC_decoder_freectx_fn pem2der_freectx;
static OSSL_FUNC_decoder_decode_fn pem2der_decode;
/*
* Context used for PEM to DER decoding.
*/
struct pem2der_ctx_st {
PROV_CTX *provctx;
};
static void *pem2der_newctx(void *provctx)
{
struct pem2der_ctx_st *ctx = OPENSSL_zalloc(sizeof(*ctx));
if (ctx != NULL)
ctx->provctx = provctx;
return ctx;
}
static void pem2der_freectx(void *vctx)
{
struct pem2der_ctx_st *ctx = vctx;
OPENSSL_free(ctx);
}
/* pem_password_cb compatible function */
struct pem2der_pass_data_st {
OSSL_PASSPHRASE_CALLBACK *cb;
void *cbarg;
};
static int pem2der_pass_helper(char *buf, int num, int w, void *data)
{
struct pem2der_pass_data_st *pass_data = data;
size_t plen;
if (pass_data == NULL
|| pass_data->cb == NULL
|| !pass_data->cb(buf, num, &plen, NULL, pass_data->cbarg))
return -1;
return (int)plen;
}
/*
* The selection parameter in pem2der_decode() is not used by this function
* because it's not relevant just to decode PEM to DER.
*/
static int pem2der_decode(void *vctx, OSSL_CORE_BIO *cin, int selection,
OSSL_CALLBACK *data_cb, void *data_cbarg,
OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg)
{
/*
* PEM names we recognise. Other PEM names should be recognised by
* other decoder implementations.
*/
static struct pem_name_map_st {
const char *pem_name;
int object_type;
const char *data_type;
const char *data_structure;
} pem_name_map[] = {
/* PKCS#8 and SubjectPublicKeyInfo */
{ PEM_STRING_PKCS8, OSSL_OBJECT_PKEY, NULL, "EncryptedPrivateKeyInfo" },
{ PEM_STRING_PKCS8INF, OSSL_OBJECT_PKEY, NULL, "PrivateKeyInfo" },
{ PEM_STRING_PUBLIC, OSSL_OBJECT_PKEY, NULL, "SubjectPublicKeyInfo" },
/* Our set of type specific PEM types */
{ PEM_STRING_DHPARAMS, OSSL_OBJECT_PKEY, "DH", "type-specific" },
{ PEM_STRING_DHXPARAMS, OSSL_OBJECT_PKEY, "X9.42 DH", "type-specific" },
{ PEM_STRING_DSA, OSSL_OBJECT_PKEY, "DSA", "type-specific" },
{ PEM_STRING_DSA_PUBLIC, OSSL_OBJECT_PKEY, "DSA", "type-specific" },
{ PEM_STRING_DSAPARAMS, OSSL_OBJECT_PKEY, "DSA", "type-specific" },
{ PEM_STRING_ECPRIVATEKEY, OSSL_OBJECT_PKEY, "EC", "type-specific" },
{ PEM_STRING_ECPARAMETERS, OSSL_OBJECT_PKEY, "EC", "type-specific" },
{ PEM_STRING_SM2PARAMETERS, OSSL_OBJECT_PKEY, "SM2", "type-specific" },
{ PEM_STRING_RSA, OSSL_OBJECT_PKEY, "RSA", "type-specific" },
{ PEM_STRING_RSA_PUBLIC, OSSL_OBJECT_PKEY, "RSA", "type-specific" },
/*
* A few others that there is at least have an object type for, even
* though there is no provider interface to handle such objects, yet.
* However, this is beneficial for the OSSL_STORE result handler.
*/
{ PEM_STRING_X509, OSSL_OBJECT_CERT, NULL, "Certificate" },
{ PEM_STRING_X509_TRUSTED, OSSL_OBJECT_CERT, NULL, "Certificate" },
{ PEM_STRING_X509_OLD, OSSL_OBJECT_CERT, NULL, "Certificate" },
{ PEM_STRING_X509_CRL, OSSL_OBJECT_CRL, NULL, "CertificateList" }
};
struct pem2der_ctx_st *ctx = vctx;
char *pem_name = NULL, *pem_header = NULL;
size_t i;
unsigned char *der = NULL;
long der_len = 0;
int ok = 0;
int objtype = OSSL_OBJECT_UNKNOWN;
ok = read_pem(ctx->provctx, cin, &pem_name, &pem_header,
&der, &der_len) > 0;
/* We return "empty handed". This is not an error. */
if (!ok)
return 1;
/*
* 10 is the number of characters in "Proc-Type:", which
* PEM_get_EVP_CIPHER_INFO() requires to be present.
* If the PEM header has less characters than that, it's
* not worth spending cycles on it.
*/
if (strlen(pem_header) > 10) {
EVP_CIPHER_INFO cipher;
struct pem2der_pass_data_st pass_data;
ok = 0; /* Assume that we fail */
pass_data.cb = pw_cb;
pass_data.cbarg = pw_cbarg;
if (!PEM_get_EVP_CIPHER_INFO(pem_header, &cipher)
|| !PEM_do_header(&cipher, der, &der_len,
pem2der_pass_helper, &pass_data))
goto end;
}
/*
* Indicated that we successfully decoded something, or not at all.
* Ending up "empty handed" is not an error.
*/
ok = 1;
/* Have a look to see if we recognise anything */
for (i = 0; i < OSSL_NELEM(pem_name_map); i++)
if (strcmp(pem_name, pem_name_map[i].pem_name) == 0)
break;
if (i < OSSL_NELEM(pem_name_map)) {
OSSL_PARAM params[5], *p = params;
/* We expect these to be read only so casting away the const is ok */
char *data_type = (char *)pem_name_map[i].data_type;
char *data_structure = (char *)pem_name_map[i].data_structure;
objtype = pem_name_map[i].object_type;
if (data_type != NULL)
*p++ =
OSSL_PARAM_construct_utf8_string(OSSL_OBJECT_PARAM_DATA_TYPE,
data_type, 0);
/* We expect this to be read only so casting away the const is ok */
if (data_structure != NULL)
*p++ =
OSSL_PARAM_construct_utf8_string(OSSL_OBJECT_PARAM_DATA_STRUCTURE,
data_structure, 0);
*p++ =
OSSL_PARAM_construct_octet_string(OSSL_OBJECT_PARAM_DATA,
der, der_len);
*p++ =
OSSL_PARAM_construct_int(OSSL_OBJECT_PARAM_TYPE, &objtype);
*p = OSSL_PARAM_construct_end();
ok = data_cb(params, data_cbarg);
}
end:
OPENSSL_free(pem_name);
OPENSSL_free(pem_header);
OPENSSL_free(der);
return ok;
}
const OSSL_DISPATCH ossl_pem_to_der_decoder_functions[] = {
{ OSSL_FUNC_DECODER_NEWCTX, (void (*)(void))pem2der_newctx },
{ OSSL_FUNC_DECODER_FREECTX, (void (*)(void))pem2der_freectx },
{ OSSL_FUNC_DECODER_DECODE, (void (*)(void))pem2der_decode },
{ 0, NULL }
};
|
