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250 lines
6.9 KiB
C
250 lines
6.9 KiB
C
/*
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* Copyright 1999-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include "internal/cryptlib.h"
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#include <openssl/pkcs12.h>
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/* Simplified PKCS#12 routines */
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static int parse_pk12(PKCS12 *p12, const char *pass, int passlen,
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EVP_PKEY **pkey, STACK_OF(X509) *ocerts);
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static int parse_bags(const STACK_OF(PKCS12_SAFEBAG) *bags, const char *pass,
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int passlen, EVP_PKEY **pkey, STACK_OF(X509) *ocerts);
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static int parse_bag(PKCS12_SAFEBAG *bag, const char *pass, int passlen,
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EVP_PKEY **pkey, STACK_OF(X509) *ocerts);
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/*
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* Parse and decrypt a PKCS#12 structure returning user key, user cert and
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* other (CA) certs. Note either ca should be NULL, *ca should be NULL, or it
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* should point to a valid STACK structure. pkey and cert can be passed
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* uninitialised.
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*/
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int PKCS12_parse(PKCS12 *p12, const char *pass, EVP_PKEY **pkey, X509 **cert,
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STACK_OF(X509) **ca)
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{
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STACK_OF(X509) *ocerts = NULL;
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X509 *x = NULL;
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if (pkey)
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*pkey = NULL;
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if (cert)
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*cert = NULL;
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/* Check for NULL PKCS12 structure */
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if (!p12) {
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PKCS12err(PKCS12_F_PKCS12_PARSE,
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PKCS12_R_INVALID_NULL_PKCS12_POINTER);
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return 0;
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}
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/* Check the mac */
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/*
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* If password is zero length or NULL then try verifying both cases to
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* determine which password is correct. The reason for this is that under
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* PKCS#12 password based encryption no password and a zero length
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* password are two different things...
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*/
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if (!pass || !*pass) {
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if (PKCS12_verify_mac(p12, NULL, 0))
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pass = NULL;
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else if (PKCS12_verify_mac(p12, "", 0))
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pass = "";
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else {
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PKCS12err(PKCS12_F_PKCS12_PARSE, PKCS12_R_MAC_VERIFY_FAILURE);
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goto err;
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}
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} else if (!PKCS12_verify_mac(p12, pass, -1)) {
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PKCS12err(PKCS12_F_PKCS12_PARSE, PKCS12_R_MAC_VERIFY_FAILURE);
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goto err;
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}
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/* Allocate stack for other certificates */
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ocerts = sk_X509_new_null();
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if (!ocerts) {
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PKCS12err(PKCS12_F_PKCS12_PARSE, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if (!parse_pk12(p12, pass, -1, pkey, ocerts)) {
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PKCS12err(PKCS12_F_PKCS12_PARSE, PKCS12_R_PARSE_ERROR);
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goto err;
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}
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while ((x = sk_X509_pop(ocerts))) {
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if (pkey && *pkey && cert && !*cert) {
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ERR_set_mark();
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if (X509_check_private_key(x, *pkey)) {
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*cert = x;
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x = NULL;
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}
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ERR_pop_to_mark();
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}
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if (ca && x) {
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if (!*ca)
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*ca = sk_X509_new_null();
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if (!*ca)
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goto err;
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if (!sk_X509_push(*ca, x))
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goto err;
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x = NULL;
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}
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X509_free(x);
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}
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sk_X509_pop_free(ocerts, X509_free);
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return 1;
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err:
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if (pkey) {
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EVP_PKEY_free(*pkey);
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*pkey = NULL;
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}
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if (cert) {
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X509_free(*cert);
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*cert = NULL;
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}
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X509_free(x);
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sk_X509_pop_free(ocerts, X509_free);
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return 0;
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}
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/* Parse the outer PKCS#12 structure */
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static int parse_pk12(PKCS12 *p12, const char *pass, int passlen,
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EVP_PKEY **pkey, STACK_OF(X509) *ocerts)
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{
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STACK_OF(PKCS7) *asafes;
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STACK_OF(PKCS12_SAFEBAG) *bags;
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int i, bagnid;
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PKCS7 *p7;
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if ((asafes = PKCS12_unpack_authsafes(p12)) == NULL)
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return 0;
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for (i = 0; i < sk_PKCS7_num(asafes); i++) {
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p7 = sk_PKCS7_value(asafes, i);
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bagnid = OBJ_obj2nid(p7->type);
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if (bagnid == NID_pkcs7_data) {
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bags = PKCS12_unpack_p7data(p7);
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} else if (bagnid == NID_pkcs7_encrypted) {
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bags = PKCS12_unpack_p7encdata(p7, pass, passlen);
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} else
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continue;
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if (!bags) {
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sk_PKCS7_pop_free(asafes, PKCS7_free);
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return 0;
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}
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if (!parse_bags(bags, pass, passlen, pkey, ocerts)) {
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sk_PKCS12_SAFEBAG_pop_free(bags, PKCS12_SAFEBAG_free);
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sk_PKCS7_pop_free(asafes, PKCS7_free);
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return 0;
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}
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sk_PKCS12_SAFEBAG_pop_free(bags, PKCS12_SAFEBAG_free);
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}
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sk_PKCS7_pop_free(asafes, PKCS7_free);
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return 1;
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}
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static int parse_bags(const STACK_OF(PKCS12_SAFEBAG) *bags, const char *pass,
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int passlen, EVP_PKEY **pkey, STACK_OF(X509) *ocerts)
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{
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int i;
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for (i = 0; i < sk_PKCS12_SAFEBAG_num(bags); i++) {
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if (!parse_bag(sk_PKCS12_SAFEBAG_value(bags, i),
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pass, passlen, pkey, ocerts))
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return 0;
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}
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return 1;
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}
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static int parse_bag(PKCS12_SAFEBAG *bag, const char *pass, int passlen,
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EVP_PKEY **pkey, STACK_OF(X509) *ocerts)
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{
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PKCS8_PRIV_KEY_INFO *p8;
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X509 *x509;
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const ASN1_TYPE *attrib;
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ASN1_BMPSTRING *fname = NULL;
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ASN1_OCTET_STRING *lkid = NULL;
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if ((attrib = PKCS12_SAFEBAG_get0_attr(bag, NID_friendlyName)))
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fname = attrib->value.bmpstring;
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if ((attrib = PKCS12_SAFEBAG_get0_attr(bag, NID_localKeyID)))
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lkid = attrib->value.octet_string;
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switch (PKCS12_SAFEBAG_get_nid(bag)) {
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case NID_keyBag:
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if (!pkey || *pkey)
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return 1;
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*pkey = EVP_PKCS82PKEY(PKCS12_SAFEBAG_get0_p8inf(bag));
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if (*pkey == NULL)
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return 0;
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break;
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case NID_pkcs8ShroudedKeyBag:
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if (!pkey || *pkey)
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return 1;
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if ((p8 = PKCS12_decrypt_skey(bag, pass, passlen)) == NULL)
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return 0;
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*pkey = EVP_PKCS82PKEY(p8);
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PKCS8_PRIV_KEY_INFO_free(p8);
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if (!(*pkey))
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return 0;
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break;
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case NID_certBag:
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if (PKCS12_SAFEBAG_get_bag_nid(bag) != NID_x509Certificate)
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return 1;
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if ((x509 = PKCS12_SAFEBAG_get1_cert(bag)) == NULL)
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return 0;
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if (lkid && !X509_keyid_set1(x509, lkid->data, lkid->length)) {
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X509_free(x509);
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return 0;
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}
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if (fname) {
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int len, r;
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unsigned char *data;
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len = ASN1_STRING_to_UTF8(&data, fname);
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if (len >= 0) {
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r = X509_alias_set1(x509, data, len);
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OPENSSL_free(data);
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if (!r) {
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X509_free(x509);
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return 0;
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}
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}
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}
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if (!sk_X509_push(ocerts, x509)) {
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X509_free(x509);
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return 0;
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}
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break;
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case NID_safeContentsBag:
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return parse_bags(PKCS12_SAFEBAG_get0_safes(bag), pass, passlen, pkey,
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ocerts);
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default:
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return 1;
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}
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return 1;
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}
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