[331] | 1 | /*
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| 2 | * Copyright 1999-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <stdio.h>
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| 11 | #include "internal/cryptlib.h"
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| 12 | #include <openssl/pkcs12.h>
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| 13 |
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| 14 | /* Simplified PKCS#12 routines */
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| 15 |
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| 16 | static int parse_pk12(PKCS12 *p12, const char *pass, int passlen,
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| 17 | EVP_PKEY **pkey, STACK_OF(X509) *ocerts);
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| 18 |
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| 19 | static int parse_bags(const STACK_OF(PKCS12_SAFEBAG) *bags, const char *pass,
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| 20 | int passlen, EVP_PKEY **pkey, STACK_OF(X509) *ocerts);
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| 21 |
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| 22 | static int parse_bag(PKCS12_SAFEBAG *bag, const char *pass, int passlen,
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| 23 | EVP_PKEY **pkey, STACK_OF(X509) *ocerts);
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| 24 |
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| 25 | /*
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| 26 | * Parse and decrypt a PKCS#12 structure returning user key, user cert and
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| 27 | * other (CA) certs. Note either ca should be NULL, *ca should be NULL, or it
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| 28 | * should point to a valid STACK structure. pkey and cert can be passed
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| 29 | * uninitialised.
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| 30 | */
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| 31 |
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| 32 | int PKCS12_parse(PKCS12 *p12, const char *pass, EVP_PKEY **pkey, X509 **cert,
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| 33 | STACK_OF(X509) **ca)
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| 34 | {
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| 35 | STACK_OF(X509) *ocerts = NULL;
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| 36 | X509 *x = NULL;
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| 37 | /* Check for NULL PKCS12 structure */
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| 38 |
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| 39 | if (!p12) {
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| 40 | PKCS12err(PKCS12_F_PKCS12_PARSE,
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| 41 | PKCS12_R_INVALID_NULL_PKCS12_POINTER);
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| 42 | return 0;
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| 43 | }
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| 44 |
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| 45 | if (pkey)
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| 46 | *pkey = NULL;
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| 47 | if (cert)
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| 48 | *cert = NULL;
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| 49 |
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| 50 | /* Check the mac */
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| 51 |
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| 52 | /*
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| 53 | * If password is zero length or NULL then try verifying both cases to
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| 54 | * determine which password is correct. The reason for this is that under
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| 55 | * PKCS#12 password based encryption no password and a zero length
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| 56 | * password are two different things...
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| 57 | */
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| 58 |
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| 59 | if (!pass || !*pass) {
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| 60 | if (PKCS12_verify_mac(p12, NULL, 0))
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| 61 | pass = NULL;
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| 62 | else if (PKCS12_verify_mac(p12, "", 0))
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| 63 | pass = "";
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| 64 | else {
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| 65 | PKCS12err(PKCS12_F_PKCS12_PARSE, PKCS12_R_MAC_VERIFY_FAILURE);
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| 66 | goto err;
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| 67 | }
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| 68 | } else if (!PKCS12_verify_mac(p12, pass, -1)) {
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| 69 | PKCS12err(PKCS12_F_PKCS12_PARSE, PKCS12_R_MAC_VERIFY_FAILURE);
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| 70 | goto err;
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| 71 | }
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| 72 |
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| 73 | /* Allocate stack for other certificates */
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| 74 | ocerts = sk_X509_new_null();
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| 75 |
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| 76 | if (!ocerts) {
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| 77 | PKCS12err(PKCS12_F_PKCS12_PARSE, ERR_R_MALLOC_FAILURE);
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| 78 | return 0;
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| 79 | }
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| 80 |
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| 81 | if (!parse_pk12(p12, pass, -1, pkey, ocerts)) {
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| 82 | PKCS12err(PKCS12_F_PKCS12_PARSE, PKCS12_R_PARSE_ERROR);
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| 83 | goto err;
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| 84 | }
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| 85 |
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| 86 | while ((x = sk_X509_pop(ocerts))) {
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| 87 | if (pkey && *pkey && cert && !*cert) {
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| 88 | ERR_set_mark();
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| 89 | if (X509_check_private_key(x, *pkey)) {
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| 90 | *cert = x;
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| 91 | x = NULL;
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| 92 | }
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| 93 | ERR_pop_to_mark();
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| 94 | }
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| 95 |
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| 96 | if (ca && x) {
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| 97 | if (!*ca)
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| 98 | *ca = sk_X509_new_null();
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| 99 | if (!*ca)
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| 100 | goto err;
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| 101 | if (!sk_X509_push(*ca, x))
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| 102 | goto err;
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| 103 | x = NULL;
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| 104 | }
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| 105 | X509_free(x);
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| 106 | }
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| 107 |
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| 108 | sk_X509_pop_free(ocerts, X509_free);
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| 109 |
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| 110 | return 1;
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| 111 |
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| 112 | err:
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| 113 |
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| 114 | if (pkey)
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| 115 | EVP_PKEY_free(*pkey);
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| 116 | if (cert)
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| 117 | X509_free(*cert);
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| 118 | X509_free(x);
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| 119 | sk_X509_pop_free(ocerts, X509_free);
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| 120 | return 0;
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| 121 |
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| 122 | }
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| 123 |
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| 124 | /* Parse the outer PKCS#12 structure */
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| 125 |
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| 126 | static int parse_pk12(PKCS12 *p12, const char *pass, int passlen,
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| 127 | EVP_PKEY **pkey, STACK_OF(X509) *ocerts)
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| 128 | {
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| 129 | STACK_OF(PKCS7) *asafes;
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| 130 | STACK_OF(PKCS12_SAFEBAG) *bags;
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| 131 | int i, bagnid;
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| 132 | PKCS7 *p7;
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| 133 |
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| 134 | if ((asafes = PKCS12_unpack_authsafes(p12)) == NULL)
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| 135 | return 0;
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| 136 | for (i = 0; i < sk_PKCS7_num(asafes); i++) {
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| 137 | p7 = sk_PKCS7_value(asafes, i);
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| 138 | bagnid = OBJ_obj2nid(p7->type);
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| 139 | if (bagnid == NID_pkcs7_data) {
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| 140 | bags = PKCS12_unpack_p7data(p7);
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| 141 | } else if (bagnid == NID_pkcs7_encrypted) {
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| 142 | bags = PKCS12_unpack_p7encdata(p7, pass, passlen);
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| 143 | } else
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| 144 | continue;
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| 145 | if (!bags) {
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| 146 | sk_PKCS7_pop_free(asafes, PKCS7_free);
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| 147 | return 0;
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| 148 | }
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| 149 | if (!parse_bags(bags, pass, passlen, pkey, ocerts)) {
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| 150 | sk_PKCS12_SAFEBAG_pop_free(bags, PKCS12_SAFEBAG_free);
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| 151 | sk_PKCS7_pop_free(asafes, PKCS7_free);
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| 152 | return 0;
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| 153 | }
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| 154 | sk_PKCS12_SAFEBAG_pop_free(bags, PKCS12_SAFEBAG_free);
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| 155 | }
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| 156 | sk_PKCS7_pop_free(asafes, PKCS7_free);
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| 157 | return 1;
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| 158 | }
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| 159 |
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| 160 | static int parse_bags(const STACK_OF(PKCS12_SAFEBAG) *bags, const char *pass,
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| 161 | int passlen, EVP_PKEY **pkey, STACK_OF(X509) *ocerts)
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| 162 | {
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| 163 | int i;
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| 164 | for (i = 0; i < sk_PKCS12_SAFEBAG_num(bags); i++) {
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| 165 | if (!parse_bag(sk_PKCS12_SAFEBAG_value(bags, i),
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| 166 | pass, passlen, pkey, ocerts))
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| 167 | return 0;
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| 168 | }
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| 169 | return 1;
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| 170 | }
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| 171 |
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| 172 | static int parse_bag(PKCS12_SAFEBAG *bag, const char *pass, int passlen,
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| 173 | EVP_PKEY **pkey, STACK_OF(X509) *ocerts)
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| 174 | {
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| 175 | PKCS8_PRIV_KEY_INFO *p8;
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| 176 | X509 *x509;
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| 177 | const ASN1_TYPE *attrib;
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| 178 | ASN1_BMPSTRING *fname = NULL;
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| 179 | ASN1_OCTET_STRING *lkid = NULL;
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| 180 |
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| 181 | if ((attrib = PKCS12_SAFEBAG_get0_attr(bag, NID_friendlyName)))
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| 182 | fname = attrib->value.bmpstring;
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| 183 |
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| 184 | if ((attrib = PKCS12_SAFEBAG_get0_attr(bag, NID_localKeyID)))
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| 185 | lkid = attrib->value.octet_string;
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| 186 |
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| 187 | switch (PKCS12_SAFEBAG_get_nid(bag)) {
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| 188 | case NID_keyBag:
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| 189 | if (!pkey || *pkey)
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| 190 | return 1;
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| 191 | *pkey = EVP_PKCS82PKEY(PKCS12_SAFEBAG_get0_p8inf(bag));
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| 192 | if (*pkey == NULL)
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| 193 | return 0;
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| 194 | break;
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| 195 |
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| 196 | case NID_pkcs8ShroudedKeyBag:
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| 197 | if (!pkey || *pkey)
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| 198 | return 1;
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| 199 | if ((p8 = PKCS12_decrypt_skey(bag, pass, passlen)) == NULL)
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| 200 | return 0;
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| 201 | *pkey = EVP_PKCS82PKEY(p8);
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| 202 | PKCS8_PRIV_KEY_INFO_free(p8);
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| 203 | if (!(*pkey))
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| 204 | return 0;
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| 205 | break;
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| 206 |
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| 207 | case NID_certBag:
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| 208 | if (PKCS12_SAFEBAG_get_bag_nid(bag) != NID_x509Certificate)
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| 209 | return 1;
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| 210 | if ((x509 = PKCS12_SAFEBAG_get1_cert(bag)) == NULL)
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| 211 | return 0;
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| 212 | if (lkid && !X509_keyid_set1(x509, lkid->data, lkid->length)) {
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| 213 | X509_free(x509);
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| 214 | return 0;
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| 215 | }
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| 216 | if (fname) {
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| 217 | int len, r;
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| 218 | unsigned char *data;
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| 219 | len = ASN1_STRING_to_UTF8(&data, fname);
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| 220 | if (len >= 0) {
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| 221 | r = X509_alias_set1(x509, data, len);
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| 222 | OPENSSL_free(data);
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| 223 | if (!r) {
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| 224 | X509_free(x509);
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| 225 | return 0;
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| 226 | }
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| 227 | }
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| 228 | }
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| 229 |
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| 230 | if (!sk_X509_push(ocerts, x509)) {
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| 231 | X509_free(x509);
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| 232 | return 0;
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| 233 | }
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| 234 |
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| 235 | break;
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| 236 |
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| 237 | case NID_safeContentsBag:
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| 238 | return parse_bags(PKCS12_SAFEBAG_get0_safes(bag), pass, passlen, pkey,
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| 239 | ocerts);
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| 240 |
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| 241 | default:
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| 242 | return 1;
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| 243 | }
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| 244 | return 1;
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| 245 | }
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