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openssl/crypto/store/store_result.c
Tomas Mraz da7db7ae6d try_pkcs12(): cleanse passphrase so it is not left on the stack 
Reviewed-by: Ben Kaduk <kaduk@mit.edu>
(Merged from https://github.com/openssl/openssl/pull/17320)
2022-01-03 10:35:36 +01:00

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/*
* Copyright 2020-2021 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 "e_os.h"
#include <string.h>
#include <openssl/core.h>
#include <openssl/core_names.h>
#include <openssl/core_object.h>
#include <openssl/err.h>
#include <openssl/pkcs12.h>
#include <openssl/provider.h>
#include <openssl/decoder.h>
#include <openssl/store.h>
#include "internal/provider.h"
#include "internal/passphrase.h"
#include "crypto/evp.h"
#include "crypto/x509.h"
#include "store_local.h"
#ifndef OSSL_OBJECT_PKCS12
/*
* The object abstraction doesn't know PKCS#12, but we want to indicate
* it anyway, so we create our own. Since the public macros use positive
* numbers, negative ones should be fine. They must never slip out from
* this translation unit anyway.
*/
# define OSSL_OBJECT_PKCS12 -1
#endif
/*
* ossl_store_handle_load_result() is initially written to be a companion
* to our 'file:' scheme provider implementation, but has been made generic
* to serve others as well.
*
* This result handler takes any object abstraction (see provider-object(7))
* and does the best it can with it. If the object is passed by value (not
* by reference), the contents are currently expected to be DER encoded.
* If an object type is specified, that will be respected; otherwise, this
* handler will guess the contents, by trying the following in order:
*
* 1. Decode it into an EVP_PKEY, using OSSL_DECODER.
* 2. Decode it into an X.509 certificate, using d2i_X509 / d2i_X509_AUX.
* 3. Decode it into an X.509 CRL, using d2i_X509_CRL.
* 4. Decode it into a PKCS#12 structure, using d2i_PKCS12 (*).
*
* For the 'file:' scheme implementation, this is division of labor. Since
* the libcrypto <-> provider interface currently doesn't support certain
* structures as first class objects, they must be unpacked from DER here
* rather than in the provider. The current exception is asymmetric keys,
* which can reside within the provider boundary, most of all thanks to
* OSSL_FUNC_keymgmt_load(), which allows loading the key material by
* reference.
*/
struct extracted_param_data_st {
int object_type;
const char *data_type;
const char *data_structure;
const char *utf8_data;
const void *octet_data;
size_t octet_data_size;
const void *ref;
size_t ref_size;
const char *desc;
};
static int try_name(struct extracted_param_data_st *, OSSL_STORE_INFO **);
static int try_key(struct extracted_param_data_st *, OSSL_STORE_INFO **,
OSSL_STORE_CTX *, const OSSL_PROVIDER *,
OSSL_LIB_CTX *, const char *);
static int try_cert(struct extracted_param_data_st *, OSSL_STORE_INFO **,
OSSL_LIB_CTX *, const char *);
static int try_crl(struct extracted_param_data_st *, OSSL_STORE_INFO **,
OSSL_LIB_CTX *, const char *);
static int try_pkcs12(struct extracted_param_data_st *, OSSL_STORE_INFO **,
OSSL_STORE_CTX *, OSSL_LIB_CTX *, const char *);
int ossl_store_handle_load_result(const OSSL_PARAM params[], void *arg)
{
struct ossl_load_result_data_st *cbdata = arg;
OSSL_STORE_INFO **v = &cbdata->v;
OSSL_STORE_CTX *ctx = cbdata->ctx;
const OSSL_PROVIDER *provider =
OSSL_STORE_LOADER_get0_provider(ctx->fetched_loader);
OSSL_LIB_CTX *libctx = ossl_provider_libctx(provider);
const char *propq = ctx->properties;
const OSSL_PARAM *p;
struct extracted_param_data_st helper_data;
memset(&helper_data, 0, sizeof(helper_data));
helper_data.object_type = OSSL_OBJECT_UNKNOWN;
if ((p = OSSL_PARAM_locate_const(params, OSSL_OBJECT_PARAM_TYPE)) != NULL
&& !OSSL_PARAM_get_int(p, &helper_data.object_type))
return 0;
p = OSSL_PARAM_locate_const(params, OSSL_OBJECT_PARAM_DATA_TYPE);
if (p != NULL
&& !OSSL_PARAM_get_utf8_string_ptr(p, &helper_data.data_type))
return 0;
p = OSSL_PARAM_locate_const(params, OSSL_OBJECT_PARAM_DATA);
if (p != NULL
&& !OSSL_PARAM_get_octet_string_ptr(p, &helper_data.octet_data,
&helper_data.octet_data_size)
&& !OSSL_PARAM_get_utf8_string_ptr(p, &helper_data.utf8_data))
return 0;
p = OSSL_PARAM_locate_const(params, OSSL_OBJECT_PARAM_DATA_STRUCTURE);
if (p != NULL
&& !OSSL_PARAM_get_utf8_string_ptr(p, &helper_data.data_structure))
return 0;
p = OSSL_PARAM_locate_const(params, OSSL_OBJECT_PARAM_REFERENCE);
if (p != NULL && !OSSL_PARAM_get_octet_string_ptr(p, &helper_data.ref,
&helper_data.ref_size))
return 0;
p = OSSL_PARAM_locate_const(params, OSSL_OBJECT_PARAM_DESC);
if (p != NULL && !OSSL_PARAM_get_utf8_string_ptr(p, &helper_data.desc))
return 0;
/*
* The helper functions return 0 on actual errors, otherwise 1, even if
* they didn't fill out |*v|.
*/
ERR_set_mark();
if (*v == NULL && !try_name(&helper_data, v))
goto err;
ERR_pop_to_mark();
ERR_set_mark();
if (*v == NULL && !try_key(&helper_data, v, ctx, provider, libctx, propq))
goto err;
ERR_pop_to_mark();
ERR_set_mark();
if (*v == NULL && !try_cert(&helper_data, v, libctx, propq))
goto err;
ERR_pop_to_mark();
ERR_set_mark();
if (*v == NULL && !try_crl(&helper_data, v, libctx, propq))
goto err;
ERR_pop_to_mark();
ERR_set_mark();
if (*v == NULL && !try_pkcs12(&helper_data, v, ctx, libctx, propq))
goto err;
ERR_pop_to_mark();
if (*v == NULL)
ERR_raise(ERR_LIB_OSSL_STORE, ERR_R_UNSUPPORTED);
return (*v != NULL);
err:
ERR_clear_last_mark();
return 0;
}
static int try_name(struct extracted_param_data_st *data, OSSL_STORE_INFO **v)
{
if (data->object_type == OSSL_OBJECT_NAME) {
char *newname = NULL, *newdesc = NULL;
if (data->utf8_data == NULL)
return 0;
if ((newname = OPENSSL_strdup(data->utf8_data)) == NULL
|| (data->desc != NULL
&& (newdesc = OPENSSL_strdup(data->desc)) == NULL)
|| (*v = OSSL_STORE_INFO_new_NAME(newname)) == NULL) {
OPENSSL_free(newname);
OPENSSL_free(newdesc);
return 0;
}
OSSL_STORE_INFO_set0_NAME_description(*v, newdesc);
}
return 1;
}
/*
* For the rest of the object types, the provider code may not know what
* type of data it gave us, so we may need to figure that out on our own.
* Therefore, we do check for OSSL_OBJECT_UNKNOWN everywhere below, and
* only return 0 on error if the object type is known.
*/
static EVP_PKEY *try_key_ref(struct extracted_param_data_st *data,
OSSL_STORE_CTX *ctx,
const OSSL_PROVIDER *provider,
OSSL_LIB_CTX *libctx, const char *propq)
{
EVP_PKEY *pk = NULL;
EVP_KEYMGMT *keymgmt = NULL;
void *keydata = NULL;
/* If we have an object reference, we must have a data type */
if (data->data_type == NULL)
return 0;
keymgmt = EVP_KEYMGMT_fetch(libctx, data->data_type, propq);
if (keymgmt != NULL) {
/*
* There are two possible cases
*
* 1. The keymgmt is from the same provider as the loader,
* so we can use evp_keymgmt_load()
* 2. The keymgmt is from another provider, then we must
* do the export/import dance.
*/
if (EVP_KEYMGMT_get0_provider(keymgmt) == provider) {
keydata = evp_keymgmt_load(keymgmt, data->ref, data->ref_size);
} else {
struct evp_keymgmt_util_try_import_data_st import_data;
OSSL_FUNC_store_export_object_fn *export_object =
ctx->fetched_loader->p_export_object;
import_data.keymgmt = keymgmt;
import_data.keydata = NULL;
import_data.selection = OSSL_KEYMGMT_SELECT_ALL;
if (export_object != NULL) {
/*
* No need to check for errors here, the value of
* |import_data.keydata| is as much an indicator.
*/
(void)export_object(ctx->loader_ctx,
data->ref, data->ref_size,
&evp_keymgmt_util_try_import,
&import_data);
}
keydata = import_data.keydata;
}
}
if (keydata != NULL)
pk = evp_keymgmt_util_make_pkey(keymgmt, keydata);
EVP_KEYMGMT_free(keymgmt);
return pk;
}
static EVP_PKEY *try_key_value(struct extracted_param_data_st *data,
OSSL_STORE_CTX *ctx,
OSSL_PASSPHRASE_CALLBACK *cb, void *cbarg,
OSSL_LIB_CTX *libctx, const char *propq)
{
EVP_PKEY *pk = NULL;
OSSL_DECODER_CTX *decoderctx = NULL;
const unsigned char *pdata = data->octet_data;
size_t pdatalen = data->octet_data_size;
int selection = 0;
switch (ctx->expected_type) {
case 0:
break;
case OSSL_STORE_INFO_PARAMS:
selection = OSSL_KEYMGMT_SELECT_ALL_PARAMETERS;
break;
case OSSL_STORE_INFO_PUBKEY:
selection =
OSSL_KEYMGMT_SELECT_PUBLIC_KEY
| OSSL_KEYMGMT_SELECT_ALL_PARAMETERS;
break;
case OSSL_STORE_INFO_PKEY:
selection = OSSL_KEYMGMT_SELECT_ALL;
break;
default:
return NULL;
}
decoderctx =
OSSL_DECODER_CTX_new_for_pkey(&pk, NULL, data->data_structure,
data->data_type, selection, libctx,
propq);
(void)OSSL_DECODER_CTX_set_passphrase_cb(decoderctx, cb, cbarg);
/* No error if this couldn't be decoded */
(void)OSSL_DECODER_from_data(decoderctx, &pdata, &pdatalen);
OSSL_DECODER_CTX_free(decoderctx);
return pk;
}
typedef OSSL_STORE_INFO *store_info_new_fn(EVP_PKEY *);
static EVP_PKEY *try_key_value_legacy(struct extracted_param_data_st *data,
store_info_new_fn **store_info_new,
OSSL_STORE_CTX *ctx,
OSSL_PASSPHRASE_CALLBACK *cb, void *cbarg,
OSSL_LIB_CTX *libctx, const char *propq)
{
EVP_PKEY *pk = NULL;
const unsigned char *der = data->octet_data, *derp;
long der_len = (long)data->octet_data_size;
/* Try PUBKEY first, that's a real easy target */
if (ctx->expected_type == 0
|| ctx->expected_type == OSSL_STORE_INFO_PUBKEY) {
derp = der;
pk = d2i_PUBKEY_ex(NULL, &derp, der_len, libctx, propq);
if (pk != NULL)
*store_info_new = OSSL_STORE_INFO_new_PUBKEY;
}
/* Try private keys next */
if (pk == NULL
&& (ctx->expected_type == 0
|| ctx->expected_type == OSSL_STORE_INFO_PKEY)) {
unsigned char *new_der = NULL;
X509_SIG *p8 = NULL;
PKCS8_PRIV_KEY_INFO *p8info = NULL;
/* See if it's an encrypted PKCS#8 and decrypt it. */
derp = der;
p8 = d2i_X509_SIG(NULL, &derp, der_len);
if (p8 != NULL) {
char pbuf[PEM_BUFSIZE];
size_t plen = 0;
if (!cb(pbuf, sizeof(pbuf), &plen, NULL, cbarg)) {
ERR_raise(ERR_LIB_OSSL_STORE, OSSL_STORE_R_BAD_PASSWORD_READ);
} else {
const X509_ALGOR *alg = NULL;
const ASN1_OCTET_STRING *oct = NULL;
int len = 0;
X509_SIG_get0(p8, &alg, &oct);
/*
* No need to check the returned value, |new_der|
* will be NULL on error anyway.
*/
PKCS12_pbe_crypt(alg, pbuf, plen,
oct->data, oct->length,
&new_der, &len, 0);
der_len = len;
der = new_der;
}
X509_SIG_free(p8);
}
/*
* If the encrypted PKCS#8 couldn't be decrypted,
* |der| is NULL
*/
if (der != NULL) {
/* Try to unpack an unencrypted PKCS#8, that's easy */
derp = der;
p8info = d2i_PKCS8_PRIV_KEY_INFO(NULL, &derp, der_len);
if (p8info != NULL) {
pk = EVP_PKCS82PKEY_ex(p8info, libctx, propq);
PKCS8_PRIV_KEY_INFO_free(p8info);
}
}
if (pk != NULL)
*store_info_new = OSSL_STORE_INFO_new_PKEY;
OPENSSL_free(new_der);
}
return pk;
}
static int try_key(struct extracted_param_data_st *data, OSSL_STORE_INFO **v,
OSSL_STORE_CTX *ctx, const OSSL_PROVIDER *provider,
OSSL_LIB_CTX *libctx, const char *propq)
{
store_info_new_fn *store_info_new = NULL;
if (data->object_type == OSSL_OBJECT_UNKNOWN
|| data->object_type == OSSL_OBJECT_PKEY) {
EVP_PKEY *pk = NULL;
/* Prefer key by reference than key by value */
if (data->object_type == OSSL_OBJECT_PKEY && data->ref != NULL) {
pk = try_key_ref(data, ctx, provider, libctx, propq);
/*
* If for some reason we couldn't get a key, it's an error.
* It indicates that while decoders could make a key reference,
* the keymgmt somehow couldn't handle it, or doesn't have a
* OSSL_FUNC_keymgmt_load function.
*/
if (pk == NULL)
return 0;
} else if (data->octet_data != NULL) {
OSSL_PASSPHRASE_CALLBACK *cb = ossl_pw_passphrase_callback_dec;
void *cbarg = &ctx->pwdata;
pk = try_key_value(data, ctx, cb, cbarg, libctx, propq);
/*
* Desperate last maneuver, in case the decoders don't support
* the data we have, then we try on our own to at least get an
* engine provided legacy key.
* This is the same as der2key_decode() does, but in a limited
* way and within the walls of libcrypto.
*/
if (pk == NULL)
pk = try_key_value_legacy(data, &store_info_new, ctx,
cb, cbarg, libctx, propq);
}
if (pk != NULL) {
data->object_type = OSSL_OBJECT_PKEY;
if (store_info_new == NULL) {
/*
* We determined the object type for OSSL_STORE_INFO, which
* makes an explicit difference between an EVP_PKEY with just
* (domain) parameters and an EVP_PKEY with actual key
* material.
* The logic is that an EVP_PKEY with actual key material
* always has the public half.
*/
if (evp_keymgmt_util_has(pk, OSSL_KEYMGMT_SELECT_PRIVATE_KEY))
store_info_new = OSSL_STORE_INFO_new_PKEY;
else if (evp_keymgmt_util_has(pk,
OSSL_KEYMGMT_SELECT_PUBLIC_KEY))
store_info_new = OSSL_STORE_INFO_new_PUBKEY;
else
store_info_new = OSSL_STORE_INFO_new_PARAMS;
}
*v = store_info_new(pk);
}
if (*v == NULL)
EVP_PKEY_free(pk);
}
return 1;
}
static int try_cert(struct extracted_param_data_st *data, OSSL_STORE_INFO **v,
OSSL_LIB_CTX *libctx, const char *propq)
{
if (data->object_type == OSSL_OBJECT_UNKNOWN
|| data->object_type == OSSL_OBJECT_CERT) {
/*
* In most cases, we can try to interpret the serialized
* data as a trusted cert (X509 + X509_AUX) and fall back
* to reading it as a normal cert (just X509), but if
* |data_type| (the PEM name) specifically declares it as a
* trusted cert, then no fallback should be engaged.
* |ignore_trusted| tells if the fallback can be used (1)
* or not (0).
*/
int ignore_trusted = 1;
X509 *cert = X509_new_ex(libctx, propq);
if (cert == NULL)
return 0;
/* If we have a data type, it should be a PEM name */
if (data->data_type != NULL
&& (strcasecmp(data->data_type, PEM_STRING_X509_TRUSTED) == 0))
ignore_trusted = 0;
if (d2i_X509_AUX(&cert, (const unsigned char **)&data->octet_data,
data->octet_data_size) == NULL
&& (!ignore_trusted
|| d2i_X509(&cert, (const unsigned char **)&data->octet_data,
data->octet_data_size) == NULL)) {
X509_free(cert);
cert = NULL;
}
if (cert != NULL) {
/* We determined the object type */
data->object_type = OSSL_OBJECT_CERT;
*v = OSSL_STORE_INFO_new_CERT(cert);
if (*v == NULL)
X509_free(cert);
}
}
return 1;
}
static int try_crl(struct extracted_param_data_st *data, OSSL_STORE_INFO **v,
OSSL_LIB_CTX *libctx, const char *propq)
{
if (data->object_type == OSSL_OBJECT_UNKNOWN
|| data->object_type == OSSL_OBJECT_CRL) {
X509_CRL *crl;
crl = d2i_X509_CRL(NULL, (const unsigned char **)&data->octet_data,
data->octet_data_size);
if (crl != NULL)
/* We determined the object type */
data->object_type = OSSL_OBJECT_CRL;
if (crl != NULL && !ossl_x509_crl_set0_libctx(crl, libctx, propq)) {
X509_CRL_free(crl);
crl = NULL;
}
if (crl != NULL)
*v = OSSL_STORE_INFO_new_CRL(crl);
if (*v == NULL)
X509_CRL_free(crl);
}
return 1;
}
static int try_pkcs12(struct extracted_param_data_st *data, OSSL_STORE_INFO **v,
OSSL_STORE_CTX *ctx,
OSSL_LIB_CTX *libctx, const char *propq)
{
int ok = 1;
/* There is no specific object type for PKCS12 */
if (data->object_type == OSSL_OBJECT_UNKNOWN) {
/* Initial parsing */
PKCS12 *p12;
p12 = d2i_PKCS12(NULL, (const unsigned char **)&data->octet_data,
data->octet_data_size);
if (p12 != NULL) {
char *pass = NULL;
char tpass[PEM_BUFSIZE + 1];
size_t tpass_len;
EVP_PKEY *pkey = NULL;
X509 *cert = NULL;
STACK_OF(X509) *chain = NULL;
data->object_type = OSSL_OBJECT_PKCS12;
ok = 0; /* Assume decryption or parse error */
if (PKCS12_verify_mac(p12, "", 0)
|| PKCS12_verify_mac(p12, NULL, 0)) {
pass = "";
} else {
static char prompt_info[] = "PKCS12 import pass phrase";
OSSL_PARAM pw_params[] = {
OSSL_PARAM_utf8_string(OSSL_PASSPHRASE_PARAM_INFO,
prompt_info,
sizeof(prompt_info) - 1),
OSSL_PARAM_END
};
if (!ossl_pw_get_passphrase(tpass, sizeof(tpass) - 1,
&tpass_len,
pw_params, 0, &ctx->pwdata)) {
ERR_raise(ERR_LIB_OSSL_STORE,
OSSL_STORE_R_PASSPHRASE_CALLBACK_ERROR);
goto p12_end;
}
pass = tpass;
/*
* ossl_pw_get_passphrase() does not NUL terminate but
* we must do it for PKCS12_parse()
*/
pass[tpass_len] = '\0';
if (!PKCS12_verify_mac(p12, pass, tpass_len)) {
ERR_raise_data(ERR_LIB_OSSL_STORE,
OSSL_STORE_R_ERROR_VERIFYING_PKCS12_MAC,
tpass_len == 0 ? "empty password" :
"maybe wrong password");
goto p12_end;
}
}
if (PKCS12_parse(p12, pass, &pkey, &cert, &chain)) {
STACK_OF(OSSL_STORE_INFO) *infos = NULL;
OSSL_STORE_INFO *osi_pkey = NULL;
OSSL_STORE_INFO *osi_cert = NULL;
OSSL_STORE_INFO *osi_ca = NULL;
ok = 1; /* Parsing went through correctly! */
if ((infos = sk_OSSL_STORE_INFO_new_null()) != NULL) {
if (pkey != NULL) {
if ((osi_pkey = OSSL_STORE_INFO_new_PKEY(pkey)) != NULL
/* clearing pkey here avoids case distinctions */
&& (pkey = NULL) == NULL
&& sk_OSSL_STORE_INFO_push(infos, osi_pkey) != 0)
osi_pkey = NULL;
else
ok = 0;
}
if (ok && cert != NULL) {
if ((osi_cert = OSSL_STORE_INFO_new_CERT(cert)) != NULL
/* clearing cert here avoids case distinctions */
&& (cert = NULL) == NULL
&& sk_OSSL_STORE_INFO_push(infos, osi_cert) != 0)
osi_cert = NULL;
else
ok = 0;
}
while (ok && sk_X509_num(chain) > 0) {
X509 *ca = sk_X509_value(chain, 0);
if ((osi_ca = OSSL_STORE_INFO_new_CERT(ca)) != NULL
&& sk_X509_shift(chain) != NULL
&& sk_OSSL_STORE_INFO_push(infos, osi_ca) != 0)
osi_ca = NULL;
else
ok = 0;
}
}
EVP_PKEY_free(pkey);
X509_free(cert);
OSSL_STACK_OF_X509_free(chain);
OSSL_STORE_INFO_free(osi_pkey);
OSSL_STORE_INFO_free(osi_cert);
OSSL_STORE_INFO_free(osi_ca);
if (!ok) {
sk_OSSL_STORE_INFO_pop_free(infos, OSSL_STORE_INFO_free);
infos = NULL;
}
ctx->cached_info = infos;
}
p12_end:
OPENSSL_cleanse(tpass, sizeof(tpass));
PKCS12_free(p12);
}
*v = sk_OSSL_STORE_INFO_shift(ctx->cached_info);
}
return ok;
}
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