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 * 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 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 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 * 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 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 * 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 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