crypto/libressl/crypto/pkcs12/p12_kiss.c

   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 }