1 /* $OpenBSD: pem_pkey.c,v 1.25 2021/12/24 12:59:18 tb Exp $ */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59 #include <stdio.h>
60 #include <string.h>
61
62 #include <openssl/opensslconf.h>
63
64 #include <openssl/buffer.h>
65 #include <openssl/err.h>
66 #include <openssl/evp.h>
67 #include <openssl/objects.h>
68 #include <openssl/pem.h>
69 #include <openssl/pkcs12.h>
70 #include <openssl/x509.h>
71
72 #ifndef OPENSSL_NO_ENGINE
73 #include <openssl/engine.h>
74 #endif
75
76 #include "asn1_locl.h"
77 #include "evp_locl.h"
78
79 int pem_check_suffix(const char *pem_str, const char *suffix);
80
81 EVP_PKEY *
PEM_read_bio_PrivateKey(BIO * bp,EVP_PKEY ** x,pem_password_cb * cb,void * u)82 PEM_read_bio_PrivateKey(BIO *bp, EVP_PKEY **x, pem_password_cb *cb, void *u)
83 {
84 char *nm = NULL;
85 const unsigned char *p = NULL;
86 unsigned char *data = NULL;
87 long len;
88 int slen;
89 EVP_PKEY *ret = NULL;
90
91 if (!PEM_bytes_read_bio(&data, &len, &nm, PEM_STRING_EVP_PKEY,
92 bp, cb, u))
93 return NULL;
94 p = data;
95
96 if (strcmp(nm, PEM_STRING_PKCS8INF) == 0) {
97 PKCS8_PRIV_KEY_INFO *p8inf;
98 p8inf = d2i_PKCS8_PRIV_KEY_INFO(NULL, &p, len);
99 if (!p8inf)
100 goto p8err;
101 ret = EVP_PKCS82PKEY(p8inf);
102 if (x) {
103 EVP_PKEY_free(*x);
104 *x = ret;
105 }
106 PKCS8_PRIV_KEY_INFO_free(p8inf);
107 } else if (strcmp(nm, PEM_STRING_PKCS8) == 0) {
108 PKCS8_PRIV_KEY_INFO *p8inf;
109 X509_SIG *p8;
110 int klen;
111 char psbuf[PEM_BUFSIZE];
112 p8 = d2i_X509_SIG(NULL, &p, len);
113 if (!p8)
114 goto p8err;
115 if (cb)
116 klen = cb(psbuf, PEM_BUFSIZE, 0, u);
117 else
118 klen = PEM_def_callback(psbuf, PEM_BUFSIZE, 0, u);
119 if (klen <= 0) {
120 PEMerror(PEM_R_BAD_PASSWORD_READ);
121 X509_SIG_free(p8);
122 goto err;
123 }
124 p8inf = PKCS8_decrypt(p8, psbuf, klen);
125 X509_SIG_free(p8);
126 if (!p8inf)
127 goto p8err;
128 ret = EVP_PKCS82PKEY(p8inf);
129 if (x) {
130 EVP_PKEY_free(*x);
131 *x = ret;
132 }
133 PKCS8_PRIV_KEY_INFO_free(p8inf);
134 } else if ((slen = pem_check_suffix(nm, "PRIVATE KEY")) > 0) {
135 const EVP_PKEY_ASN1_METHOD *ameth;
136 ameth = EVP_PKEY_asn1_find_str(NULL, nm, slen);
137 if (!ameth || !ameth->old_priv_decode)
138 goto p8err;
139 ret = d2i_PrivateKey(ameth->pkey_id, x, &p, len);
140 }
141
142 p8err:
143 if (ret == NULL)
144 PEMerror(ERR_R_ASN1_LIB);
145 err:
146 free(nm);
147 freezero(data, len);
148 return (ret);
149 }
150
151 int
PEM_write_bio_PrivateKey(BIO * bp,EVP_PKEY * x,const EVP_CIPHER * enc,unsigned char * kstr,int klen,pem_password_cb * cb,void * u)152 PEM_write_bio_PrivateKey(BIO *bp, EVP_PKEY *x, const EVP_CIPHER *enc,
153 unsigned char *kstr, int klen, pem_password_cb *cb, void *u)
154 {
155 if (x->ameth == NULL || x->ameth->priv_encode != NULL)
156 return PEM_write_bio_PKCS8PrivateKey(bp, x, enc,
157 (char *)kstr, klen, cb, u);
158
159 return PEM_write_bio_PrivateKey_traditional(bp, x, enc, kstr, klen, cb,
160 u);
161 }
162
163 int
PEM_write_bio_PrivateKey_traditional(BIO * bp,EVP_PKEY * x,const EVP_CIPHER * enc,unsigned char * kstr,int klen,pem_password_cb * cb,void * u)164 PEM_write_bio_PrivateKey_traditional(BIO *bp, EVP_PKEY *x,
165 const EVP_CIPHER *enc, unsigned char *kstr, int klen, pem_password_cb *cb,
166 void *u)
167 {
168 char pem_str[80];
169
170 (void) snprintf(pem_str, sizeof(pem_str), "%s PRIVATE KEY",
171 x->ameth->pem_str);
172 return PEM_ASN1_write_bio((i2d_of_void *)i2d_PrivateKey,
173 pem_str, bp, x, enc, kstr, klen, cb, u);
174 }
175
176 EVP_PKEY *
PEM_read_bio_Parameters(BIO * bp,EVP_PKEY ** x)177 PEM_read_bio_Parameters(BIO *bp, EVP_PKEY **x)
178 {
179 char *nm = NULL;
180 const unsigned char *p = NULL;
181 unsigned char *data = NULL;
182 long len;
183 int slen;
184 EVP_PKEY *ret = NULL;
185
186 if (!PEM_bytes_read_bio(&data, &len, &nm, PEM_STRING_PARAMETERS,
187 bp, 0, NULL))
188 return NULL;
189 p = data;
190
191 if ((slen = pem_check_suffix(nm, "PARAMETERS")) > 0) {
192 ret = EVP_PKEY_new();
193 if (!ret)
194 goto err;
195 if (!EVP_PKEY_set_type_str(ret, nm, slen) ||
196 !ret->ameth->param_decode ||
197 !ret->ameth->param_decode(ret, &p, len)) {
198 EVP_PKEY_free(ret);
199 ret = NULL;
200 goto err;
201 }
202 if (x) {
203 EVP_PKEY_free(*x);
204 *x = ret;
205 }
206 }
207
208 err:
209 if (ret == NULL)
210 PEMerror(ERR_R_ASN1_LIB);
211 free(nm);
212 free(data);
213 return (ret);
214 }
215
216 int
PEM_write_bio_Parameters(BIO * bp,EVP_PKEY * x)217 PEM_write_bio_Parameters(BIO *bp, EVP_PKEY *x)
218 {
219 char pem_str[80];
220
221 if (!x->ameth || !x->ameth->param_encode)
222 return 0;
223
224 (void) snprintf(pem_str, sizeof(pem_str), "%s PARAMETERS",
225 x->ameth->pem_str);
226 return PEM_ASN1_write_bio((i2d_of_void *)x->ameth->param_encode,
227 pem_str, bp, x, NULL, NULL, 0, 0, NULL);
228 }
229
230 EVP_PKEY *
PEM_read_PrivateKey(FILE * fp,EVP_PKEY ** x,pem_password_cb * cb,void * u)231 PEM_read_PrivateKey(FILE *fp, EVP_PKEY **x, pem_password_cb *cb, void *u)
232 {
233 BIO *b;
234 EVP_PKEY *ret;
235
236 if ((b = BIO_new(BIO_s_file())) == NULL) {
237 PEMerror(ERR_R_BUF_LIB);
238 return (0);
239 }
240 BIO_set_fp(b, fp, BIO_NOCLOSE);
241 ret = PEM_read_bio_PrivateKey(b, x, cb, u);
242 BIO_free(b);
243 return (ret);
244 }
245
246 int
PEM_write_PrivateKey(FILE * fp,EVP_PKEY * x,const EVP_CIPHER * enc,unsigned char * kstr,int klen,pem_password_cb * cb,void * u)247 PEM_write_PrivateKey(FILE *fp, EVP_PKEY *x, const EVP_CIPHER *enc,
248 unsigned char *kstr, int klen, pem_password_cb *cb, void *u)
249 {
250 BIO *b;
251 int ret;
252
253 if ((b = BIO_new_fp(fp, BIO_NOCLOSE)) == NULL) {
254 PEMerror(ERR_R_BUF_LIB);
255 return 0;
256 }
257 ret = PEM_write_bio_PrivateKey(b, x, enc, kstr, klen, cb, u);
258 BIO_free(b);
259 return ret;
260 }
261
262