1 /* $OpenBSD: pem_pkey.c,v 1.28 2023/11/19 15:46:10 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 #include "asn1_local.h" 73 #include "evp_local.h" 74 75 int pem_check_suffix(const char *pem_str, const char *suffix); 76 77 EVP_PKEY * 78 PEM_read_bio_PrivateKey(BIO *bp, EVP_PKEY **x, pem_password_cb *cb, void *u) 79 { 80 char *nm = NULL; 81 const unsigned char *p = NULL; 82 unsigned char *data = NULL; 83 long len; 84 int slen; 85 EVP_PKEY *ret = NULL; 86 87 if (!PEM_bytes_read_bio(&data, &len, &nm, PEM_STRING_EVP_PKEY, 88 bp, cb, u)) 89 return NULL; 90 p = data; 91 92 if (strcmp(nm, PEM_STRING_PKCS8INF) == 0) { 93 PKCS8_PRIV_KEY_INFO *p8inf; 94 p8inf = d2i_PKCS8_PRIV_KEY_INFO(NULL, &p, len); 95 if (!p8inf) 96 goto p8err; 97 ret = EVP_PKCS82PKEY(p8inf); 98 if (x) { 99 EVP_PKEY_free(*x); 100 *x = ret; 101 } 102 PKCS8_PRIV_KEY_INFO_free(p8inf); 103 } else if (strcmp(nm, PEM_STRING_PKCS8) == 0) { 104 PKCS8_PRIV_KEY_INFO *p8inf; 105 X509_SIG *p8; 106 int klen; 107 char psbuf[PEM_BUFSIZE]; 108 p8 = d2i_X509_SIG(NULL, &p, len); 109 if (!p8) 110 goto p8err; 111 if (cb) 112 klen = cb(psbuf, PEM_BUFSIZE, 0, u); 113 else 114 klen = PEM_def_callback(psbuf, PEM_BUFSIZE, 0, u); 115 if (klen <= 0) { 116 PEMerror(PEM_R_BAD_PASSWORD_READ); 117 X509_SIG_free(p8); 118 goto err; 119 } 120 p8inf = PKCS8_decrypt(p8, psbuf, klen); 121 X509_SIG_free(p8); 122 if (!p8inf) 123 goto p8err; 124 ret = EVP_PKCS82PKEY(p8inf); 125 if (x) { 126 EVP_PKEY_free(*x); 127 *x = ret; 128 } 129 PKCS8_PRIV_KEY_INFO_free(p8inf); 130 } else if ((slen = pem_check_suffix(nm, "PRIVATE KEY")) > 0) { 131 const EVP_PKEY_ASN1_METHOD *ameth; 132 ameth = EVP_PKEY_asn1_find_str(NULL, nm, slen); 133 if (!ameth || !ameth->old_priv_decode) 134 goto p8err; 135 ret = d2i_PrivateKey(ameth->pkey_id, x, &p, len); 136 } 137 138 p8err: 139 if (ret == NULL) 140 PEMerror(ERR_R_ASN1_LIB); 141 err: 142 free(nm); 143 freezero(data, len); 144 return (ret); 145 } 146 LCRYPTO_ALIAS(PEM_read_bio_PrivateKey); 147 148 int 149 PEM_write_bio_PrivateKey(BIO *bp, EVP_PKEY *x, const EVP_CIPHER *enc, 150 unsigned char *kstr, int klen, pem_password_cb *cb, void *u) 151 { 152 if (x->ameth == NULL || x->ameth->priv_encode != NULL) 153 return PEM_write_bio_PKCS8PrivateKey(bp, x, enc, 154 (char *)kstr, klen, cb, u); 155 156 return PEM_write_bio_PrivateKey_traditional(bp, x, enc, kstr, klen, cb, 157 u); 158 } 159 LCRYPTO_ALIAS(PEM_write_bio_PrivateKey); 160 161 int 162 PEM_write_bio_PrivateKey_traditional(BIO *bp, EVP_PKEY *x, 163 const EVP_CIPHER *enc, unsigned char *kstr, int klen, pem_password_cb *cb, 164 void *u) 165 { 166 char pem_str[80]; 167 168 (void) snprintf(pem_str, sizeof(pem_str), "%s PRIVATE KEY", 169 x->ameth->pem_str); 170 return PEM_ASN1_write_bio((i2d_of_void *)i2d_PrivateKey, 171 pem_str, bp, x, enc, kstr, klen, cb, u); 172 } 173 LCRYPTO_ALIAS(PEM_write_bio_PrivateKey_traditional); 174 175 EVP_PKEY * 176 PEM_read_bio_Parameters(BIO *bp, EVP_PKEY **x) 177 { 178 char *nm = NULL; 179 const unsigned char *p = NULL; 180 unsigned char *data = NULL; 181 long len; 182 int slen; 183 EVP_PKEY *ret = NULL; 184 185 if (!PEM_bytes_read_bio(&data, &len, &nm, PEM_STRING_PARAMETERS, 186 bp, 0, NULL)) 187 return NULL; 188 p = data; 189 190 if ((slen = pem_check_suffix(nm, "PARAMETERS")) > 0) { 191 ret = EVP_PKEY_new(); 192 if (!ret) 193 goto err; 194 if (!EVP_PKEY_set_type_str(ret, nm, slen) || 195 !ret->ameth->param_decode || 196 !ret->ameth->param_decode(ret, &p, len)) { 197 EVP_PKEY_free(ret); 198 ret = NULL; 199 goto err; 200 } 201 if (x) { 202 EVP_PKEY_free(*x); 203 *x = ret; 204 } 205 } 206 207 err: 208 if (ret == NULL) 209 PEMerror(ERR_R_ASN1_LIB); 210 free(nm); 211 free(data); 212 return (ret); 213 } 214 LCRYPTO_ALIAS(PEM_read_bio_Parameters); 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 LCRYPTO_ALIAS(PEM_write_bio_Parameters); 230 231 EVP_PKEY * 232 PEM_read_PrivateKey(FILE *fp, EVP_PKEY **x, pem_password_cb *cb, void *u) 233 { 234 BIO *b; 235 EVP_PKEY *ret; 236 237 if ((b = BIO_new(BIO_s_file())) == NULL) { 238 PEMerror(ERR_R_BUF_LIB); 239 return (0); 240 } 241 BIO_set_fp(b, fp, BIO_NOCLOSE); 242 ret = PEM_read_bio_PrivateKey(b, x, cb, u); 243 BIO_free(b); 244 return (ret); 245 } 246 LCRYPTO_ALIAS(PEM_read_PrivateKey); 247 248 int 249 PEM_write_PrivateKey(FILE *fp, EVP_PKEY *x, const EVP_CIPHER *enc, 250 unsigned char *kstr, int klen, pem_password_cb *cb, void *u) 251 { 252 BIO *b; 253 int ret; 254 255 if ((b = BIO_new_fp(fp, BIO_NOCLOSE)) == NULL) { 256 PEMerror(ERR_R_BUF_LIB); 257 return 0; 258 } 259 ret = PEM_write_bio_PrivateKey(b, x, enc, kstr, klen, cb, u); 260 BIO_free(b); 261 return ret; 262 } 263 LCRYPTO_ALIAS(PEM_write_PrivateKey); 264