1 /* $OpenBSD: p12_kiss.c,v 1.16 2014/07/11 08:44:49 jsing 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 /* Simplified PKCS#12 routines */ 65 66 static int parse_pk12( PKCS12 *p12, const char *pass, int passlen, 67 EVP_PKEY **pkey, STACK_OF(X509) *ocerts); 68 69 static int parse_bags( STACK_OF(PKCS12_SAFEBAG) *bags, const char *pass, 70 int passlen, EVP_PKEY **pkey, STACK_OF(X509) *ocerts); 71 72 static int parse_bag( PKCS12_SAFEBAG *bag, const char *pass, int passlen, 73 EVP_PKEY **pkey, STACK_OF(X509) *ocerts); 74 75 /* Parse and decrypt a PKCS#12 structure returning user key, user cert 76 * and other (CA) certs. Note either ca should be NULL, *ca should be NULL, 77 * or it should point to a valid STACK structure. pkey and cert can be 78 * passed unitialised. 79 */ 80 81 int 82 PKCS12_parse(PKCS12 *p12, const char *pass, EVP_PKEY **pkey, X509 **cert, 83 STACK_OF(X509) **ca) 84 { 85 STACK_OF(X509) *ocerts = NULL; 86 X509 *x = NULL; 87 /* Check for NULL PKCS12 structure */ 88 89 if (!p12) { 90 PKCS12err(PKCS12_F_PKCS12_PARSE, 91 PKCS12_R_INVALID_NULL_PKCS12_POINTER); 92 return 0; 93 } 94 95 if (pkey) 96 *pkey = NULL; 97 if (cert) 98 *cert = NULL; 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 || !*pass) { 109 if (PKCS12_verify_mac(p12, NULL, 0)) 110 pass = NULL; 111 else if (PKCS12_verify_mac(p12, "", 0)) 112 pass = ""; 113 else { 114 PKCS12err(PKCS12_F_PKCS12_PARSE, 115 PKCS12_R_MAC_VERIFY_FAILURE); 116 goto err; 117 } 118 } else if (!PKCS12_verify_mac(p12, pass, -1)) { 119 PKCS12err(PKCS12_F_PKCS12_PARSE, PKCS12_R_MAC_VERIFY_FAILURE); 120 goto err; 121 } 122 123 /* Allocate stack for other certificates */ 124 ocerts = sk_X509_new_null(); 125 if (!ocerts) { 126 PKCS12err(PKCS12_F_PKCS12_PARSE, ERR_R_MALLOC_FAILURE); 127 return 0; 128 } 129 130 if (!parse_pk12 (p12, pass, -1, pkey, ocerts)) { 131 PKCS12err(PKCS12_F_PKCS12_PARSE, PKCS12_R_PARSE_ERROR); 132 goto err; 133 } 134 135 while ((x = sk_X509_pop(ocerts))) { 136 if (pkey && *pkey && cert && !*cert) { 137 if (X509_check_private_key(x, *pkey)) { 138 *cert = x; 139 x = NULL; 140 } 141 } 142 143 if (ca && x) { 144 if (!*ca) 145 *ca = sk_X509_new_null(); 146 if (!*ca) 147 goto err; 148 if (!sk_X509_push(*ca, x)) 149 goto err; 150 x = NULL; 151 } 152 X509_free(x); 153 } 154 155 if (ocerts) 156 sk_X509_pop_free(ocerts, X509_free); 157 158 return 1; 159 160 err: 161 if (pkey && *pkey) 162 EVP_PKEY_free(*pkey); 163 if (cert) 164 X509_free(*cert); 165 X509_free(x); 166 if (ocerts) 167 sk_X509_pop_free(ocerts, X509_free); 168 return 0; 169 } 170 171 /* Parse the outer PKCS#12 structure */ 172 173 static int 174 parse_pk12(PKCS12 *p12, const char *pass, int passlen, EVP_PKEY **pkey, 175 STACK_OF(X509) *ocerts) 176 { 177 STACK_OF(PKCS7) *asafes; 178 STACK_OF(PKCS12_SAFEBAG) *bags; 179 int i, bagnid; 180 PKCS7 *p7; 181 182 if (!(asafes = PKCS12_unpack_authsafes (p12))) 183 return 0; 184 for (i = 0; i < sk_PKCS7_num (asafes); i++) { 185 p7 = sk_PKCS7_value (asafes, i); 186 bagnid = OBJ_obj2nid (p7->type); 187 if (bagnid == NID_pkcs7_data) { 188 bags = PKCS12_unpack_p7data(p7); 189 } else if (bagnid == NID_pkcs7_encrypted) { 190 bags = PKCS12_unpack_p7encdata(p7, pass, passlen); 191 } else 192 continue; 193 if (!bags) { 194 sk_PKCS7_pop_free(asafes, PKCS7_free); 195 return 0; 196 } 197 if (!parse_bags(bags, pass, passlen, pkey, ocerts)) { 198 sk_PKCS12_SAFEBAG_pop_free(bags, PKCS12_SAFEBAG_free); 199 sk_PKCS7_pop_free(asafes, PKCS7_free); 200 return 0; 201 } 202 sk_PKCS12_SAFEBAG_pop_free(bags, PKCS12_SAFEBAG_free); 203 } 204 sk_PKCS7_pop_free(asafes, PKCS7_free); 205 return 1; 206 } 207 208 static int 209 parse_bags(STACK_OF(PKCS12_SAFEBAG) *bags, const char *pass, int passlen, 210 EVP_PKEY **pkey, STACK_OF(X509) *ocerts) 211 { 212 int i; 213 214 for (i = 0; i < sk_PKCS12_SAFEBAG_num(bags); i++) { 215 if (!parse_bag(sk_PKCS12_SAFEBAG_value(bags, i), pass, passlen, 216 pkey, ocerts)) 217 return 0; 218 } 219 return 1; 220 } 221 222 static int 223 parse_bag(PKCS12_SAFEBAG *bag, const char *pass, int passlen, EVP_PKEY **pkey, 224 STACK_OF(X509) *ocerts) 225 { 226 PKCS8_PRIV_KEY_INFO *p8; 227 X509 *x509; 228 ASN1_TYPE *attrib; 229 ASN1_BMPSTRING *fname = NULL; 230 ASN1_OCTET_STRING *lkid = NULL; 231 232 if ((attrib = PKCS12_get_attr (bag, NID_friendlyName))) 233 fname = attrib->value.bmpstring; 234 235 if ((attrib = PKCS12_get_attr (bag, NID_localKeyID))) 236 lkid = attrib->value.octet_string; 237 238 switch (M_PKCS12_bag_type(bag)) { 239 case NID_keyBag: 240 if (!pkey || *pkey) 241 return 1; 242 if (!(*pkey = EVP_PKCS82PKEY(bag->value.keybag))) 243 return 0; 244 break; 245 246 case NID_pkcs8ShroudedKeyBag: 247 if (!pkey || *pkey) 248 return 1; 249 if (!(p8 = PKCS12_decrypt_skey(bag, pass, passlen))) 250 return 0; 251 *pkey = EVP_PKCS82PKEY(p8); 252 PKCS8_PRIV_KEY_INFO_free(p8); 253 if (!(*pkey)) 254 return 0; 255 break; 256 257 case NID_certBag: 258 if (M_PKCS12_cert_bag_type(bag) != NID_x509Certificate ) 259 return 1; 260 if (!(x509 = PKCS12_certbag2x509(bag))) 261 return 0; 262 if (lkid && !X509_keyid_set1(x509, lkid->data, lkid->length)) { 263 X509_free(x509); 264 return 0; 265 } 266 if (fname) { 267 int len, r; 268 unsigned char *data; 269 len = ASN1_STRING_to_UTF8(&data, fname); 270 if (len >= 0) { 271 r = X509_alias_set1(x509, data, len); 272 free(data); 273 if (!r) { 274 X509_free(x509); 275 return 0; 276 } 277 } 278 } 279 280 if (!sk_X509_push(ocerts, x509)) { 281 X509_free(x509); 282 return 0; 283 } 284 285 break; 286 287 case NID_safeContentsBag: 288 return parse_bags(bag->value.safes, pass, passlen, 289 pkey, ocerts); 290 break; 291 292 default: 293 return 1; 294 break; 295 } 296 return 1; 297 } 298