1/* $OpenBSD: p12_kiss.c,v 1.27 2023/02/16 08:38:17 tb Exp $ */ 2/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL 3 * project 1999. 4 */ 5/* ==================================================================== 6 * Copyright (c) 1999 The OpenSSL Project. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in 17 * the documentation and/or other materials provided with the 18 * distribution. 19 * 20 * 3. All advertising materials mentioning features or use of this 21 * software must display the following acknowledgment: 22 * "This product includes software developed by the OpenSSL Project 23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 24 * 25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 26 * endorse or promote products derived from this software without 27 * prior written permission. For written permission, please contact 28 * licensing@OpenSSL.org. 29 * 30 * 5. Products derived from this software may not be called "OpenSSL" 31 * nor may "OpenSSL" appear in their names without prior written 32 * permission of the OpenSSL Project. 33 * 34 * 6. Redistributions of any form whatsoever must retain the following 35 * acknowledgment: 36 * "This product includes software developed by the OpenSSL Project 37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 38 * 39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 50 * OF THE POSSIBILITY OF SUCH DAMAGE. 51 * ==================================================================== 52 * 53 * This product includes cryptographic software written by Eric Young 54 * (eay@cryptsoft.com). This product includes software written by Tim 55 * Hudson (tjh@cryptsoft.com). 56 * 57 */ 58 59#include <stdio.h> 60 61#include <openssl/err.h> 62#include <openssl/pkcs12.h> 63 64#include "pkcs12_local.h" 65 66/* Simplified PKCS#12 routines */ 67 68static int parse_pk12( PKCS12 *p12, const char *pass, int passlen, 69 EVP_PKEY **pkey, STACK_OF(X509) *ocerts); 70 71static int parse_bags( STACK_OF(PKCS12_SAFEBAG) *bags, const char *pass, 72 int passlen, EVP_PKEY **pkey, STACK_OF(X509) *ocerts); 73 74static int parse_bag( PKCS12_SAFEBAG *bag, const char *pass, int passlen, 75 EVP_PKEY **pkey, STACK_OF(X509) *ocerts); 76 77/* Parse and decrypt a PKCS#12 structure returning user key, user cert 78 * and other (CA) certs. Note either ca should be NULL, *ca should be NULL, 79 * or it should point to a valid STACK structure. pkey and cert can be 80 * passed unitialised. 81 */ 82 83int 84PKCS12_parse(PKCS12 *p12, const char *pass, EVP_PKEY **pkey, X509 **cert, 85 STACK_OF(X509) **ca) 86{ 87 STACK_OF(X509) *ocerts = NULL; 88 X509 *x = NULL; 89 90 if (pkey != NULL) 91 *pkey = NULL; 92 if (cert != NULL) 93 *cert = NULL; 94 95 if (p12 == NULL) { 96 PKCS12error(PKCS12_R_INVALID_NULL_PKCS12_POINTER); 97 goto err; 98 } 99 100 /* Check the mac */ 101 102 /* If password is zero length or NULL then try verifying both cases 103 * to determine which password is correct. The reason for this is that 104 * under PKCS#12 password based encryption no password and a zero length 105 * password are two different things... 106 */ 107 108 if (pass == NULL || *pass == '\0') { 109 if (PKCS12_verify_mac(p12, NULL, 0)) 110 pass = NULL; 111 else if (PKCS12_verify_mac(p12, "", 0)) 112 pass = ""; 113 else { 114 PKCS12error(PKCS12_R_MAC_VERIFY_FAILURE); 115 goto err; 116 } 117 } else if (!PKCS12_verify_mac(p12, pass, -1)) { 118 PKCS12error(PKCS12_R_MAC_VERIFY_FAILURE); 119 goto err; 120 } 121 122 /* Allocate stack for other certificates */ 123 if ((ocerts = sk_X509_new_null()) == NULL) { 124 PKCS12error(ERR_R_MALLOC_FAILURE); 125 goto err; 126 } 127 128 if (!parse_pk12(p12, pass, -1, pkey, ocerts)) { 129 PKCS12error(PKCS12_R_PARSE_ERROR); 130 goto err; 131 } 132 133 while ((x = sk_X509_pop(ocerts)) != NULL) { 134 if (pkey != NULL && *pkey != NULL && 135 cert != NULL && *cert == NULL) { 136 ERR_set_mark(); 137 if (X509_check_private_key(x, *pkey)) { 138 *cert = x; 139 x = NULL; 140 } 141 ERR_pop_to_mark(); 142 } 143 144 if (ca != NULL && x != NULL) { 145 if (*ca == NULL) 146 *ca = sk_X509_new_null(); 147 if (*ca == NULL) 148 goto err; 149 if (!sk_X509_push(*ca, x)) 150 goto err; 151 x = NULL; 152 } 153 X509_free(x); 154 x = NULL; 155 } 156 157 sk_X509_pop_free(ocerts, X509_free); 158 159 return 1; 160 161err: 162 if (pkey != NULL) 163 EVP_PKEY_free(*pkey); 164 if (cert != NULL) 165 X509_free(*cert); 166 X509_free(x); 167 sk_X509_pop_free(ocerts, X509_free); 168 169 return 0; 170} 171LCRYPTO_ALIAS(PKCS12_parse); 172 173/* Parse the outer PKCS#12 structure */ 174 175static int 176parse_pk12(PKCS12 *p12, const char *pass, int passlen, EVP_PKEY **pkey, 177 STACK_OF(X509) *ocerts) 178{ 179 STACK_OF(PKCS7) *asafes; 180 STACK_OF(PKCS12_SAFEBAG) *bags; 181 int i, bagnid; 182 PKCS7 *p7; 183 184 if (!(asafes = PKCS12_unpack_authsafes(p12))) 185 return 0; 186 for (i = 0; i < sk_PKCS7_num(asafes); i++) { 187 p7 = sk_PKCS7_value(asafes, i); 188 bagnid = OBJ_obj2nid(p7->type); 189 if (bagnid == NID_pkcs7_data) { 190 bags = PKCS12_unpack_p7data(p7); 191 } else if (bagnid == NID_pkcs7_encrypted) { 192 bags = PKCS12_unpack_p7encdata(p7, pass, passlen); 193 } else 194 continue; 195 if (!bags) { 196 sk_PKCS7_pop_free(asafes, PKCS7_free); 197 return 0; 198 } 199 if (!parse_bags(bags, pass, passlen, pkey, ocerts)) { 200 sk_PKCS12_SAFEBAG_pop_free(bags, PKCS12_SAFEBAG_free); 201 sk_PKCS7_pop_free(asafes, PKCS7_free); 202 return 0; 203 } 204 sk_PKCS12_SAFEBAG_pop_free(bags, PKCS12_SAFEBAG_free); 205 } 206 sk_PKCS7_pop_free(asafes, PKCS7_free); 207 return 1; 208} 209 210static int 211parse_bags(STACK_OF(PKCS12_SAFEBAG) *bags, const char *pass, int passlen, 212 EVP_PKEY **pkey, STACK_OF(X509) *ocerts) 213{ 214 int i; 215 216 for (i = 0; i < sk_PKCS12_SAFEBAG_num(bags); i++) { 217 if (!parse_bag(sk_PKCS12_SAFEBAG_value(bags, i), pass, passlen, 218 pkey, ocerts)) 219 return 0; 220 } 221 return 1; 222} 223 224static int 225parse_bag(PKCS12_SAFEBAG *bag, const char *pass, int passlen, EVP_PKEY **pkey, 226 STACK_OF(X509) *ocerts) 227{ 228 PKCS8_PRIV_KEY_INFO *p8; 229 X509 *x509; 230 const ASN1_TYPE *attrib; 231 ASN1_BMPSTRING *fname = NULL; 232 ASN1_OCTET_STRING *lkid = NULL; 233 234 if ((attrib = PKCS12_SAFEBAG_get0_attr(bag, NID_friendlyName))) 235 fname = attrib->value.bmpstring; 236 237 if ((attrib = PKCS12_SAFEBAG_get0_attr(bag, NID_localKeyID))) 238 lkid = attrib->value.octet_string; 239 240 switch (OBJ_obj2nid(bag->type)) { 241 case NID_keyBag: 242 if (!pkey || *pkey) 243 return 1; 244 if (!(*pkey = EVP_PKCS82PKEY(bag->value.keybag))) 245 return 0; 246 break; 247 248 case NID_pkcs8ShroudedKeyBag: 249 if (!pkey || *pkey) 250 return 1; 251 if (!(p8 = PKCS12_decrypt_skey(bag, pass, passlen))) 252 return 0; 253 *pkey = EVP_PKCS82PKEY(p8); 254 PKCS8_PRIV_KEY_INFO_free(p8); 255 if (!(*pkey)) 256 return 0; 257 break; 258 259 case NID_certBag: 260 if (OBJ_obj2nid(bag->value.bag->type) != NID_x509Certificate ) 261 return 1; 262 if (!(x509 = PKCS12_certbag2x509(bag))) 263 return 0; 264 if (lkid && !X509_keyid_set1(x509, lkid->data, lkid->length)) { 265 X509_free(x509); 266 return 0; 267 } 268 if (fname) { 269 int len, r; 270 unsigned char *data = NULL; 271 len = ASN1_STRING_to_UTF8(&data, fname); 272 if (len >= 0) { 273 r = X509_alias_set1(x509, data, len); 274 free(data); 275 if (!r) { 276 X509_free(x509); 277 return 0; 278 } 279 } 280 } 281 282 if (!sk_X509_push(ocerts, x509)) { 283 X509_free(x509); 284 return 0; 285 } 286 287 break; 288 289 case NID_safeContentsBag: 290 return parse_bags(bag->value.safes, pass, passlen, 291 pkey, ocerts); 292 break; 293 294 default: 295 return 1; 296 break; 297 } 298 return 1; 299} 300