pineapple-src/externals/libressl/crypto/cms/cms_pwri.c
2022-04-24 22:29:35 +02:00

433 lines
11 KiB
C
Executable file

/* $OpenBSD: cms_pwri.c,v 1.27 2022/01/19 13:47:44 inoguchi Exp $ */
/*
* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
* project.
*/
/* ====================================================================
* Copyright (c) 2009 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* licensing@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*/
#include <string.h>
#include "cryptlib.h"
#include <openssl/asn1t.h>
#include <openssl/pem.h>
#include <openssl/x509v3.h>
#include <openssl/err.h>
#include <openssl/cms.h>
#include <openssl/rand.h>
#include <openssl/aes.h>
#include "cms_lcl.h"
#include "asn1/asn1_locl.h"
int
CMS_RecipientInfo_set0_password(CMS_RecipientInfo *ri, unsigned char *pass,
ssize_t passlen)
{
CMS_PasswordRecipientInfo *pwri;
if (ri->type != CMS_RECIPINFO_PASS) {
CMSerror(CMS_R_NOT_PWRI);
return 0;
}
pwri = ri->d.pwri;
pwri->pass = pass;
if (pass && passlen < 0)
passlen = strlen((char *)pass);
pwri->passlen = passlen;
return 1;
}
CMS_RecipientInfo *
CMS_add0_recipient_password(CMS_ContentInfo *cms, int iter, int wrap_nid,
int pbe_nid, unsigned char *pass, ssize_t passlen,
const EVP_CIPHER *kekciph)
{
CMS_RecipientInfo *ri = NULL;
CMS_EnvelopedData *env;
CMS_PasswordRecipientInfo *pwri;
EVP_CIPHER_CTX *ctx = NULL;
X509_ALGOR *encalg = NULL;
unsigned char iv[EVP_MAX_IV_LENGTH];
int ivlen;
env = cms_get0_enveloped(cms);
if (!env)
return NULL;
if (wrap_nid <= 0)
wrap_nid = NID_id_alg_PWRI_KEK;
if (pbe_nid <= 0)
pbe_nid = NID_id_pbkdf2;
/* Get from enveloped data */
if (kekciph == NULL)
kekciph = env->encryptedContentInfo->cipher;
if (kekciph == NULL) {
CMSerror(CMS_R_NO_CIPHER);
return NULL;
}
if (wrap_nid != NID_id_alg_PWRI_KEK) {
CMSerror(CMS_R_UNSUPPORTED_KEY_ENCRYPTION_ALGORITHM);
return NULL;
}
/* Setup algorithm identifier for cipher */
encalg = X509_ALGOR_new();
if (encalg == NULL) {
goto merr;
}
if ((ctx = EVP_CIPHER_CTX_new()) == NULL)
goto merr;
if (EVP_EncryptInit_ex(ctx, kekciph, NULL, NULL, NULL) <= 0) {
CMSerror(ERR_R_EVP_LIB);
goto err;
}
ivlen = EVP_CIPHER_CTX_iv_length(ctx);
if (ivlen > 0) {
arc4random_buf(iv, ivlen);
if (EVP_EncryptInit_ex(ctx, NULL, NULL, NULL, iv) <= 0) {
CMSerror(ERR_R_EVP_LIB);
goto err;
}
encalg->parameter = ASN1_TYPE_new();
if (!encalg->parameter) {
CMSerror(ERR_R_MALLOC_FAILURE);
goto err;
}
if (EVP_CIPHER_param_to_asn1(ctx, encalg->parameter) <= 0) {
CMSerror(CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
goto err;
}
}
encalg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(ctx));
EVP_CIPHER_CTX_free(ctx);
ctx = NULL;
/* Initialize recipient info */
ri = (CMS_RecipientInfo *)ASN1_item_new(&CMS_RecipientInfo_it);
if (ri == NULL)
goto merr;
ri->d.pwri = (CMS_PasswordRecipientInfo *)ASN1_item_new(&CMS_PasswordRecipientInfo_it);
if (ri->d.pwri == NULL)
goto merr;
ri->type = CMS_RECIPINFO_PASS;
pwri = ri->d.pwri;
/* Since this is overwritten, free up empty structure already there */
X509_ALGOR_free(pwri->keyEncryptionAlgorithm);
pwri->keyEncryptionAlgorithm = X509_ALGOR_new();
if (pwri->keyEncryptionAlgorithm == NULL)
goto merr;
pwri->keyEncryptionAlgorithm->algorithm = OBJ_nid2obj(wrap_nid);
pwri->keyEncryptionAlgorithm->parameter = ASN1_TYPE_new();
if (pwri->keyEncryptionAlgorithm->parameter == NULL)
goto merr;
if (!ASN1_item_pack(encalg, &X509_ALGOR_it,
&pwri->keyEncryptionAlgorithm->parameter->value.sequence))
goto merr;
pwri->keyEncryptionAlgorithm->parameter->type = V_ASN1_SEQUENCE;
X509_ALGOR_free(encalg);
encalg = NULL;
/* Setup PBE algorithm */
pwri->keyDerivationAlgorithm = PKCS5_pbkdf2_set(iter, NULL, 0, -1, -1);
if (!pwri->keyDerivationAlgorithm)
goto err;
CMS_RecipientInfo_set0_password(ri, pass, passlen);
pwri->version = 0;
if (!sk_CMS_RecipientInfo_push(env->recipientInfos, ri))
goto merr;
return ri;
merr:
CMSerror(ERR_R_MALLOC_FAILURE);
err:
EVP_CIPHER_CTX_free(ctx);
if (ri)
ASN1_item_free((ASN1_VALUE *)ri, &CMS_RecipientInfo_it);
X509_ALGOR_free(encalg);
return NULL;
}
/*
* This is an implementation of the key wrapping mechanism in RFC3211, at
* some point this should go into EVP.
*/
static int
kek_unwrap_key(unsigned char *out, size_t *outlen, const unsigned char *in,
size_t inlen, EVP_CIPHER_CTX *ctx)
{
size_t blocklen = EVP_CIPHER_CTX_block_size(ctx);
unsigned char *tmp;
int outl, rv = 0;
if (inlen < 2 * blocklen) {
/* too small */
return 0;
}
if (inlen % blocklen) {
/* Invalid size */
return 0;
}
if ((tmp = malloc(inlen)) == NULL) {
CMSerror(ERR_R_MALLOC_FAILURE);
return 0;
}
/* setup IV by decrypting last two blocks */
if (!EVP_DecryptUpdate(ctx, tmp + inlen - 2 * blocklen, &outl,
in + inlen - 2 * blocklen, blocklen * 2)
/*
* Do a decrypt of last decrypted block to set IV to correct value
* output it to start of buffer so we don't corrupt decrypted block
* this works because buffer is at least two block lengths long.
*/
|| !EVP_DecryptUpdate(ctx, tmp, &outl, tmp + inlen - blocklen, blocklen)
/* Can now decrypt first n - 1 blocks */
|| !EVP_DecryptUpdate(ctx, tmp, &outl, in, inlen - blocklen)
/* Reset IV to original value */
|| !EVP_DecryptInit_ex(ctx, NULL, NULL, NULL, NULL)
/* Decrypt again */
|| !EVP_DecryptUpdate(ctx, tmp, &outl, tmp, inlen))
goto err;
/* Check check bytes */
if (((tmp[1] ^ tmp[4]) & (tmp[2] ^ tmp[5]) & (tmp[3] ^ tmp[6])) != 0xff) {
/* Check byte failure */
goto err;
}
if (inlen < (size_t)(tmp[0] - 4)) {
/* Invalid length value */
goto err;
}
*outlen = (size_t)tmp[0];
memcpy(out, tmp + 4, *outlen);
rv = 1;
err:
freezero(tmp, inlen);
return rv;
}
static int
kek_wrap_key(unsigned char *out, size_t *outlen, const unsigned char *in,
size_t inlen, EVP_CIPHER_CTX *ctx)
{
size_t blocklen = EVP_CIPHER_CTX_block_size(ctx);
size_t olen;
int dummy;
/*
* First decide length of output buffer: need header and round up to
* multiple of block length.
*/
olen = (inlen + 4 + blocklen - 1) / blocklen;
olen *= blocklen;
if (olen < 2 * blocklen) {
/* Key too small */
return 0;
}
if (inlen > 0xFF) {
/* Key too large */
return 0;
}
if (out) {
/* Set header */
out[0] = (unsigned char)inlen;
out[1] = in[0] ^ 0xFF;
out[2] = in[1] ^ 0xFF;
out[3] = in[2] ^ 0xFF;
memcpy(out + 4, in, inlen);
/* Add random padding to end */
if (olen > inlen + 4)
arc4random_buf(out + 4 + inlen, olen - 4 - inlen);
/* Encrypt twice */
if (!EVP_EncryptUpdate(ctx, out, &dummy, out, olen) ||
!EVP_EncryptUpdate(ctx, out, &dummy, out, olen))
return 0;
}
*outlen = olen;
return 1;
}
/* Encrypt/Decrypt content key in PWRI recipient info */
int
cms_RecipientInfo_pwri_crypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri,
int en_de)
{
CMS_EncryptedContentInfo *ec;
CMS_PasswordRecipientInfo *pwri;
int r = 0;
X509_ALGOR *algtmp, *kekalg = NULL;
EVP_CIPHER_CTX *kekctx = NULL;
const EVP_CIPHER *kekcipher;
unsigned char *key = NULL;
size_t keylen;
ec = cms->d.envelopedData->encryptedContentInfo;
pwri = ri->d.pwri;
if (!pwri->pass) {
CMSerror(CMS_R_NO_PASSWORD);
return 0;
}
algtmp = pwri->keyEncryptionAlgorithm;
if (!algtmp || OBJ_obj2nid(algtmp->algorithm) != NID_id_alg_PWRI_KEK) {
CMSerror(CMS_R_UNSUPPORTED_KEY_ENCRYPTION_ALGORITHM);
return 0;
}
if (algtmp->parameter != NULL &&
algtmp->parameter->type == V_ASN1_SEQUENCE &&
algtmp->parameter->value.sequence != NULL)
kekalg = ASN1_item_unpack(algtmp->parameter->value.sequence,
&X509_ALGOR_it);
if (kekalg == NULL) {
CMSerror(CMS_R_INVALID_KEY_ENCRYPTION_PARAMETER);
return 0;
}
kekcipher = EVP_get_cipherbyobj(kekalg->algorithm);
if (!kekcipher) {
CMSerror(CMS_R_UNKNOWN_CIPHER);
return 0;
}
kekctx = EVP_CIPHER_CTX_new();
if (kekctx == NULL) {
CMSerror(ERR_R_MALLOC_FAILURE);
return 0;
}
/* Fixup cipher based on AlgorithmIdentifier to set IV etc */
if (!EVP_CipherInit_ex(kekctx, kekcipher, NULL, NULL, NULL, en_de))
goto err;
EVP_CIPHER_CTX_set_padding(kekctx, 0);
if (EVP_CIPHER_asn1_to_param(kekctx, kekalg->parameter) <= 0) {
CMSerror(CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
goto err;
}
algtmp = pwri->keyDerivationAlgorithm;
/* Finish password based key derivation to setup key in "ctx" */
if (EVP_PBE_CipherInit(algtmp->algorithm, (char *)pwri->pass,
pwri->passlen, algtmp->parameter, kekctx, en_de) < 0) {
CMSerror(ERR_R_EVP_LIB);
goto err;
}
/* Finally wrap/unwrap the key */
if (en_de) {
if (!kek_wrap_key(NULL, &keylen, ec->key, ec->keylen, kekctx))
goto err;
key = malloc(keylen);
if (key == NULL)
goto err;
if (!kek_wrap_key(key, &keylen, ec->key, ec->keylen, kekctx))
goto err;
pwri->encryptedKey->data = key;
pwri->encryptedKey->length = keylen;
} else {
key = malloc(pwri->encryptedKey->length);
if (key == NULL) {
CMSerror(ERR_R_MALLOC_FAILURE);
goto err;
}
if (!kek_unwrap_key(key, &keylen, pwri->encryptedKey->data,
pwri->encryptedKey->length, kekctx)) {
CMSerror(CMS_R_UNWRAP_FAILURE);
goto err;
}
freezero(ec->key, ec->keylen);
ec->key = key;
ec->keylen = keylen;
}
r = 1;
err:
EVP_CIPHER_CTX_free(kekctx);
if (!r)
free(key);
X509_ALGOR_free(kekalg);
return r;
}