p12_kiss.c
/*
* Copyright 1999-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include "internal/cryptlib.h"
#include <openssl/pkcs12.h>
#include "crypto/x509.h" /* for X509_add_cert_new() */
/* Simplified PKCS#12 routines */
static int parse_pk12(PKCS12 *p12, const char *pass, int passlen,
EVP_PKEY **pkey, STACK_OF(X509) *ocerts);
static int parse_bags(const STACK_OF(PKCS12_SAFEBAG) *bags, const char *pass,
int passlen, EVP_PKEY **pkey, STACK_OF(X509) *ocerts);
static int parse_bag(PKCS12_SAFEBAG *bag, const char *pass, int passlen,
EVP_PKEY **pkey, STACK_OF(X509) *ocerts);
/*
* Parse and decrypt a PKCS#12 structure returning user key, user cert and
* other (CA) certs. Note either ca should be NULL, *ca should be NULL, or it
* should point to a valid STACK structure. pkey and/or cert may be NULL;
* if non-NULL the variables they point to can be passed uninitialised.
*/
int PKCS12_parse(PKCS12 *p12, const char *pass, EVP_PKEY **pkey, X509 **cert,
STACK_OF(X509) **ca)
{
STACK_OF(X509) *ocerts = NULL;
X509 *x = NULL;
if (pkey != NULL)
*pkey = NULL;
if (cert != NULL)
*cert = NULL;
/* Check for NULL PKCS12 structure */
if (p12 == NULL) {
PKCS12err(PKCS12_F_PKCS12_PARSE,
PKCS12_R_INVALID_NULL_PKCS12_POINTER);
return 0;
}
/* Check the mac */
/*
* If password is zero length or NULL then try verifying both cases to
* determine which password is correct. The reason for this is that under
* PKCS#12 password based encryption no password and a zero length
* password are two different things...
*/
if (pass == NULL || *pass == '\0') {
if (PKCS12_verify_mac(p12, NULL, 0))
pass = NULL;
else if (PKCS12_verify_mac(p12, "", 0))
pass = "";
else {
PKCS12err(PKCS12_F_PKCS12_PARSE, PKCS12_R_MAC_VERIFY_FAILURE);
goto err;
}
} else if (!PKCS12_verify_mac(p12, pass, -1)) {
PKCS12err(PKCS12_F_PKCS12_PARSE, PKCS12_R_MAC_VERIFY_FAILURE);
goto err;
}
/* If needed, allocate stack for other certificates */
if ((cert != NULL || ca != NULL)
&& (ocerts = sk_X509_new_null()) == NULL) {
PKCS12err(PKCS12_F_PKCS12_PARSE, ERR_R_MALLOC_FAILURE);
goto err;
}
if (!parse_pk12(p12, pass, -1, pkey, ocerts)) {
int err = ERR_peek_last_error();
if (ERR_GET_LIB(err) != ERR_LIB_EVP
&& ERR_GET_REASON(err) != EVP_R_UNSUPPORTED_ALGORITHM)
PKCS12err(0, PKCS12_R_PARSE_ERROR);
goto err;
}
/* Split the certs in ocerts over *cert and *ca as far as requested */
while ((x = sk_X509_shift(ocerts)) != NULL) {
if (pkey != NULL && *pkey != NULL
&& cert != NULL && *cert == NULL) {
int match;
ERR_set_mark();
match = X509_check_private_key(x, *pkey);
ERR_pop_to_mark();
if (match) {
*cert = x;
continue;
}
}
if (ca != NULL) {
if (!X509_add_cert_new(ca, x, X509_ADD_FLAG_DEFAULT))
goto err;
continue;
}
X509_free(x);
}
sk_X509_free(ocerts);
return 1;
err:
if (pkey != NULL) {
EVP_PKEY_free(*pkey);
*pkey = NULL;
}
if (cert != NULL) {
X509_free(*cert);
*cert = NULL;
}
X509_free(x);
sk_X509_pop_free(ocerts, X509_free);
return 0;
}
/* Parse the outer PKCS#12 structure */
/* pkey and/or ocerts may be NULL */
static int parse_pk12(PKCS12 *p12, const char *pass, int passlen,
EVP_PKEY **pkey, STACK_OF(X509) *ocerts)
{
STACK_OF(PKCS7) *asafes;
STACK_OF(PKCS12_SAFEBAG) *bags;
int i, bagnid;
PKCS7 *p7;
if ((asafes = PKCS12_unpack_authsafes(p12)) == NULL)
return 0;
for (i = 0; i < sk_PKCS7_num(asafes); i++) {
p7 = sk_PKCS7_value(asafes, i);
bagnid = OBJ_obj2nid(p7->type);
if (bagnid == NID_pkcs7_data) {
bags = PKCS12_unpack_p7data(p7);
} else if (bagnid == NID_pkcs7_encrypted) {
bags = PKCS12_unpack_p7encdata(p7, pass, passlen);
} else
continue;
if (!bags) {
sk_PKCS7_pop_free(asafes, PKCS7_free);
return 0;
}
if (!parse_bags(bags, pass, passlen, pkey, ocerts)) {
sk_PKCS12_SAFEBAG_pop_free(bags, PKCS12_SAFEBAG_free);
sk_PKCS7_pop_free(asafes, PKCS7_free);
return 0;
}
sk_PKCS12_SAFEBAG_pop_free(bags, PKCS12_SAFEBAG_free);
}
sk_PKCS7_pop_free(asafes, PKCS7_free);
return 1;
}
/* pkey and/or ocerts may be NULL */
static int parse_bags(const STACK_OF(PKCS12_SAFEBAG) *bags, const char *pass,
int passlen, EVP_PKEY **pkey, STACK_OF(X509) *ocerts)
{
int i;
for (i = 0; i < sk_PKCS12_SAFEBAG_num(bags); i++) {
if (!parse_bag(sk_PKCS12_SAFEBAG_value(bags, i),
pass, passlen, pkey, ocerts))
return 0;
}
return 1;
}
/* pkey and/or ocerts may be NULL */
static int parse_bag(PKCS12_SAFEBAG *bag, const char *pass, int passlen,
EVP_PKEY **pkey, STACK_OF(X509) *ocerts)
{
PKCS8_PRIV_KEY_INFO *p8;
X509 *x509;
const ASN1_TYPE *attrib;
ASN1_BMPSTRING *fname = NULL;
ASN1_OCTET_STRING *lkid = NULL;
if ((attrib = PKCS12_SAFEBAG_get0_attr(bag, NID_friendlyName)))
fname = attrib->value.bmpstring;
if ((attrib = PKCS12_SAFEBAG_get0_attr(bag, NID_localKeyID)))
lkid = attrib->value.octet_string;
switch (PKCS12_SAFEBAG_get_nid(bag)) {
case NID_keyBag:
if (pkey == NULL || *pkey != NULL)
return 1;
*pkey = EVP_PKCS82PKEY(PKCS12_SAFEBAG_get0_p8inf(bag));
if (*pkey == NULL)
return 0;
break;
case NID_pkcs8ShroudedKeyBag:
if (pkey == NULL || *pkey != NULL)
return 1;
if ((p8 = PKCS12_decrypt_skey(bag, pass, passlen)) == NULL)
return 0;
*pkey = EVP_PKCS82PKEY(p8);
PKCS8_PRIV_KEY_INFO_free(p8);
if (!(*pkey))
return 0;
break;
case NID_certBag:
if (ocerts == NULL
|| PKCS12_SAFEBAG_get_bag_nid(bag) != NID_x509Certificate)
return 1;
if ((x509 = PKCS12_SAFEBAG_get1_cert(bag)) == NULL)
return 0;
if (lkid && !X509_keyid_set1(x509, lkid->data, lkid->length)) {
X509_free(x509);
return 0;
}
if (fname) {
int len, r;
unsigned char *data;
len = ASN1_STRING_to_UTF8(&data, fname);
if (len >= 0) {
r = X509_alias_set1(x509, data, len);
OPENSSL_free(data);
if (!r) {
X509_free(x509);
return 0;
}
}
}
if (!sk_X509_push(ocerts, x509)) {
X509_free(x509);
return 0;
}
break;
case NID_safeContentsBag:
return parse_bags(PKCS12_SAFEBAG_get0_safes(bag), pass, passlen, pkey,
ocerts);
default:
return 1;
}
return 1;
}
