crypto/pkcs12/p12_kiss.c

   1 /*
   2  * Copyright 1999-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include "internal/cryptlib.h"
  12 #include <openssl/pkcs12.h>
  13
  14 /* Simplified PKCS#12 routines */
  15
  16 static int parse_pk12(PKCS12 *p12, const char *pass, int passlen,
  17                       EVP_PKEY **pkey, STACK_OF(X509) *ocerts);
  18
  19 static int parse_bags(const STACK_OF(PKCS12_SAFEBAG) *bags, const char *pass,
  20                       int passlen, EVP_PKEY **pkey, STACK_OF(X509) *ocerts);
  21
  22 static int parse_bag(PKCS12_SAFEBAG *bag, const char *pass, int passlen,
  23                      EVP_PKEY **pkey, STACK_OF(X509) *ocerts);
  24
  25 /*
  26  * Parse and decrypt a PKCS#12 structure returning user key, user cert and
  27  * other (CA) certs. Note either ca should be NULL, *ca should be NULL, or it
  28  * should point to a valid STACK structure. pkey and cert can be passed
  29  * uninitialised.
  30  */
  31
  32 int PKCS12_parse(PKCS12 *p12, const char *pass, EVP_PKEY **pkey, X509 **cert,
  33                  STACK_OF(X509) **ca)
  34 {
  35     STACK_OF(X509) *ocerts = NULL;
  36     X509 *x = NULL;
  37     /* Check for NULL PKCS12 structure */
  38
  39     if (!p12) {
  40         PKCS12err(PKCS12_F_PKCS12_PARSE,
  41                   PKCS12_R_INVALID_NULL_PKCS12_POINTER);
  42         return 0;
  43     }
  44
  45     if (pkey)
  46         *pkey = NULL;
  47     if (cert)
  48         *cert = NULL;
  49
  50     /* Check the mac */
  51
  52     /*
  53      * If password is zero length or NULL then try verifying both cases to
  54      * determine which password is correct. The reason for this is that under
  55      * PKCS#12 password based encryption no password and a zero length
  56      * password are two different things...
  57      */
  58
  59     if (!pass || !*pass) {
  60         if (PKCS12_verify_mac(p12, NULL, 0))
  61             pass = NULL;
  62         else if (PKCS12_verify_mac(p12, "", 0))
  63             pass = "";
  64         else {
  65             PKCS12err(PKCS12_F_PKCS12_PARSE, PKCS12_R_MAC_VERIFY_FAILURE);
  66             goto err;
  67         }
  68     } else if (!PKCS12_verify_mac(p12, pass, -1)) {
  69         PKCS12err(PKCS12_F_PKCS12_PARSE, PKCS12_R_MAC_VERIFY_FAILURE);
  70         goto err;
  71     }
  72
  73     /* Allocate stack for other certificates */
  74     ocerts = sk_X509_new_null();
  75
  76     if (!ocerts) {
  77         PKCS12err(PKCS12_F_PKCS12_PARSE, ERR_R_MALLOC_FAILURE);
  78         return 0;
  79     }
  80
  81     if (!parse_pk12(p12, pass, -1, pkey, ocerts)) {
  82         PKCS12err(PKCS12_F_PKCS12_PARSE, PKCS12_R_PARSE_ERROR);
  83         goto err;
  84     }
  85
  86     while ((x = sk_X509_pop(ocerts))) {
  87         if (pkey && *pkey && cert && !*cert) {
  88             ERR_set_mark();
  89             if (X509_check_private_key(x, *pkey)) {
  90                 *cert = x;
  91                 x = NULL;
  92             }
  93             ERR_pop_to_mark();
  94         }
  95
  96         if (ca && x) {
  97             if (!*ca)
  98                 *ca = sk_X509_new_null();
  99             if (!*ca)
 100                 goto err;
 101             if (!sk_X509_push(*ca, x))
 102                 goto err;
 103             x = NULL;
 104         }
 105         X509_free(x);
 106     }
 107
 108     sk_X509_pop_free(ocerts, X509_free);
 109
 110     return 1;
 111
 112  err:
 113
 114     if (pkey)
 115         EVP_PKEY_free(*pkey);
 116     if (cert)
 117         X509_free(*cert);
 118     X509_free(x);
 119     sk_X509_pop_free(ocerts, X509_free);
 120     return 0;
 121
 122 }
 123
 124 /* Parse the outer PKCS#12 structure */
 125
 126 static int parse_pk12(PKCS12 *p12, const char *pass, int passlen,
 127                       EVP_PKEY **pkey, STACK_OF(X509) *ocerts)
 128 {
 129     STACK_OF(PKCS7) *asafes;
 130     STACK_OF(PKCS12_SAFEBAG) *bags;
 131     int i, bagnid;
 132     PKCS7 *p7;
 133
 134     if ((asafes = PKCS12_unpack_authsafes(p12)) == NULL)
 135         return 0;
 136     for (i = 0; i < sk_PKCS7_num(asafes); i++) {
 137         p7 = sk_PKCS7_value(asafes, i);
 138         bagnid = OBJ_obj2nid(p7->type);
 139         if (bagnid == NID_pkcs7_data) {
 140             bags = PKCS12_unpack_p7data(p7);
 141         } else if (bagnid == NID_pkcs7_encrypted) {
 142             bags = PKCS12_unpack_p7encdata(p7, pass, passlen);
 143         } else
 144             continue;
 145         if (!bags) {
 146             sk_PKCS7_pop_free(asafes, PKCS7_free);
 147             return 0;
 148         }
 149         if (!parse_bags(bags, pass, passlen, pkey, ocerts)) {
 150             sk_PKCS12_SAFEBAG_pop_free(bags, PKCS12_SAFEBAG_free);
 151             sk_PKCS7_pop_free(asafes, PKCS7_free);
 152             return 0;
 153         }
 154         sk_PKCS12_SAFEBAG_pop_free(bags, PKCS12_SAFEBAG_free);
 155     }
 156     sk_PKCS7_pop_free(asafes, PKCS7_free);
 157     return 1;
 158 }
 159
 160 static int parse_bags(const STACK_OF(PKCS12_SAFEBAG) *bags, const char *pass,
 161                       int passlen, EVP_PKEY **pkey, STACK_OF(X509) *ocerts)
 162 {
 163     int i;
 164     for (i = 0; i < sk_PKCS12_SAFEBAG_num(bags); i++) {
 165         if (!parse_bag(sk_PKCS12_SAFEBAG_value(bags, i),
 166                        pass, passlen, pkey, ocerts))
 167             return 0;
 168     }
 169     return 1;
 170 }
 171
 172 static int parse_bag(PKCS12_SAFEBAG *bag, const char *pass, int passlen,
 173                      EVP_PKEY **pkey, STACK_OF(X509) *ocerts)
 174 {
 175     PKCS8_PRIV_KEY_INFO *p8;
 176     X509 *x509;
 177     const ASN1_TYPE *attrib;
 178     ASN1_BMPSTRING *fname = NULL;
 179     ASN1_OCTET_STRING *lkid = NULL;
 180
 181     if ((attrib = PKCS12_SAFEBAG_get0_attr(bag, NID_friendlyName)))
 182         fname = attrib->value.bmpstring;
 183
 184     if ((attrib = PKCS12_SAFEBAG_get0_attr(bag, NID_localKeyID)))
 185         lkid = attrib->value.octet_string;
 186
 187     switch (PKCS12_SAFEBAG_get_nid(bag)) {
 188     case NID_keyBag:
 189         if (!pkey || *pkey)
 190             return 1;
 191         *pkey = EVP_PKCS82PKEY(PKCS12_SAFEBAG_get0_p8inf(bag));
 192         if (*pkey == NULL)
 193             return 0;
 194         break;
 195
 196     case NID_pkcs8ShroudedKeyBag:
 197         if (!pkey || *pkey)
 198             return 1;
 199         if ((p8 = PKCS12_decrypt_skey(bag, pass, passlen)) == NULL)
 200             return 0;
 201         *pkey = EVP_PKCS82PKEY(p8);
 202         PKCS8_PRIV_KEY_INFO_free(p8);
 203         if (!(*pkey))
 204             return 0;
 205         break;
 206
 207     case NID_certBag:
 208         if (PKCS12_SAFEBAG_get_bag_nid(bag) != NID_x509Certificate)
 209             return 1;
 210         if ((x509 = PKCS12_SAFEBAG_get1_cert(bag)) == NULL)
 211             return 0;
 212         if (lkid && !X509_keyid_set1(x509, lkid->data, lkid->length)) {
 213             X509_free(x509);
 214             return 0;
 215         }
 216         if (fname) {
 217             int len, r;
 218             unsigned char *data;
 219             len = ASN1_STRING_to_UTF8(&data, fname);
 220             if (len >= 0) {
 221                 r = X509_alias_set1(x509, data, len);
 222                 OPENSSL_free(data);
 223                 if (!r) {
 224                     X509_free(x509);
 225                     return 0;
 226                 }
 227             }
 228         }
 229
 230         if (!sk_X509_push(ocerts, x509)) {
 231             X509_free(x509);
 232             return 0;
 233         }
 234
 235         break;
 236
 237     case NID_safeContentsBag:
 238         return parse_bags(PKCS12_SAFEBAG_get0_safes(bag), pass, passlen, pkey,
 239                           ocerts);
 240
 241     default:
 242         return 1;
 243     }
 244     return 1;
 245 }