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opensc/src/libopensc/pkcs15-sec.c

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/*
* pkcs15-sec.c: PKCS#15 cryptography functions
*
* Copyright (C) 2001, 2002 Juha Yrjölä <juha.yrjola@iki.fi>
* Copyright (C) 2007 Nils Larsch <nils@larsch.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "internal.h"
#include "pkcs15.h"
static int select_key_file(struct sc_pkcs15_card *p15card,
const struct sc_pkcs15_prkey_info *prkey,
sc_security_env_t *senv)
{
sc_context_t *ctx = p15card->card->ctx;
sc_path_t path, file_id;
int r;
LOG_FUNC_CALLED(ctx);
memset(&path, 0, sizeof(sc_path_t));
memset(&file_id, 0, sizeof(sc_path_t));
/* TODO: Why file_app may be NULL -- at least 3F00 has to be present?
* Check validity of the following assumption. */
/* For pkcs15-emulated cards, the file_app may be NULL,
* in that case we always assume an absolute path */
if (!prkey->path.len && prkey->path.aid.len) {
/* Private key is a SDO allocated in application DF */
path = prkey->path;
}
else if (prkey->path.len == 2 && p15card->file_app != NULL) {
/* Path is relative to app. DF */
path = p15card->file_app->path;
file_id = prkey->path;
sc_append_path(&path, &file_id);
senv->file_ref = file_id;
senv->flags |= SC_SEC_ENV_FILE_REF_PRESENT;
}
else if (prkey->path.len > 2) {
path = prkey->path;
memcpy(file_id.value, prkey->path.value + prkey->path.len - 2, 2);
file_id.len = 2;
file_id.type = SC_PATH_TYPE_FILE_ID;
senv->file_ref = file_id;
senv->flags |= SC_SEC_ENV_FILE_REF_PRESENT;
}
else {
LOG_TEST_RET(ctx, SC_ERROR_INVALID_ARGUMENTS, "invalid private key path");
}
r = sc_select_file(p15card->card, &path, NULL);
LOG_TEST_RET(ctx, r, "sc_select_file() failed");
LOG_FUNC_RETURN(ctx, SC_SUCCESS);
}
static int use_key(struct sc_pkcs15_card *p15card,
const struct sc_pkcs15_object *obj,
sc_security_env_t *senv,
int (*card_command)(sc_card_t *card,
const u8 * in, size_t inlen,
u8 * out, size_t outlen),
const u8 * in, size_t inlen, u8 * out, size_t outlen)
{
int r = SC_SUCCESS;
int revalidated_cached_pin = 0;
const struct sc_pkcs15_prkey_info *prkey = (const struct sc_pkcs15_prkey_info *) obj->data;
r = sc_lock(p15card->card);
LOG_TEST_RET(p15card->card->ctx, r, "sc_lock() failed");
do {
if (prkey->path.len != 0 || prkey->path.aid.len != 0) {
r = select_key_file(p15card, prkey, senv);
if (r < 0) {
sc_log(p15card->card->ctx,
"Unable to select private key file");
}
}
if (r == SC_SUCCESS)
r = sc_set_security_env(p15card->card, senv, 0);
if (r == SC_SUCCESS)
r = card_command(p15card->card, in, inlen, out, outlen);
if (revalidated_cached_pin)
/* only re-validate once */
break;
if (r == SC_ERROR_SECURITY_STATUS_NOT_SATISFIED) {
r = sc_pkcs15_pincache_revalidate(p15card, obj);
if (r < 0)
break;
revalidated_cached_pin = 1;
}
} while (revalidated_cached_pin);
sc_unlock(p15card->card);
return r;
}
static int format_senv(struct sc_pkcs15_card *p15card,
const struct sc_pkcs15_object *obj,
sc_security_env_t *senv_out, sc_algorithm_info_t **alg_info_out)
{
sc_context_t *ctx = p15card->card->ctx;
const struct sc_pkcs15_prkey_info *prkey = (const struct sc_pkcs15_prkey_info *) obj->data;
memset(senv_out, 0, sizeof(*senv_out));
/* Card driver should have the access to supported algorithms from 'tokenInfo'. So that
* it can get value of card specific 'AlgorithmInfo::algRef'. */
memcpy(senv_out->supported_algos, &p15card->tokeninfo->supported_algos, sizeof(senv_out->supported_algos));
if ((obj->type & SC_PKCS15_TYPE_CLASS_MASK) != SC_PKCS15_TYPE_PRKEY)
LOG_TEST_RET(ctx, SC_ERROR_NOT_ALLOWED, "This is not a private key");
/* If the key is not native, we can't operate with it. */
if (!prkey->native)
LOG_TEST_RET(ctx, SC_ERROR_NOT_SUPPORTED, "This key is not native, cannot operate with it");
switch (obj->type) {
case SC_PKCS15_TYPE_PRKEY_RSA:
*alg_info_out = sc_card_find_rsa_alg(p15card->card, prkey->modulus_length);
if (*alg_info_out == NULL) {
sc_log(ctx,
"Card does not support RSA with key length %"SC_FORMAT_LEN_SIZE_T"u",
prkey->modulus_length);
LOG_FUNC_RETURN(ctx, SC_ERROR_NOT_SUPPORTED);
}
senv_out->algorithm = SC_ALGORITHM_RSA;
break;
case SC_PKCS15_TYPE_PRKEY_GOSTR3410:
*alg_info_out = sc_card_find_gostr3410_alg(p15card->card, prkey->modulus_length);
if (*alg_info_out == NULL) {
sc_log(ctx,
"Card does not support GOSTR3410 with key length %"SC_FORMAT_LEN_SIZE_T"u",
prkey->modulus_length);
LOG_FUNC_RETURN(ctx, SC_ERROR_NOT_SUPPORTED);
}
senv_out->algorithm = SC_ALGORITHM_GOSTR3410;
break;
case SC_PKCS15_TYPE_PRKEY_EC:
*alg_info_out = sc_card_find_ec_alg(p15card->card, prkey->field_length, NULL);
if (*alg_info_out == NULL) {
sc_log(ctx,
"Card does not support EC with field_size %"SC_FORMAT_LEN_SIZE_T"u",
prkey->field_length);
LOG_FUNC_RETURN(ctx, SC_ERROR_NOT_SUPPORTED);
}
senv_out->algorithm = SC_ALGORITHM_EC;
senv_out->flags |= SC_SEC_ENV_ALG_REF_PRESENT;
senv_out->algorithm_ref = prkey->field_length;
break;
/* add other crypto types here */
default:
LOG_TEST_RET(ctx, SC_ERROR_NOT_SUPPORTED, "Key type not supported");
}
senv_out->flags |= SC_SEC_ENV_ALG_PRESENT;
/* optional keyReference attribute (the default value is -1) */
if (prkey->key_reference >= 0) {
senv_out->key_ref_len = 1;
senv_out->key_ref[0] = prkey->key_reference & 0xFF;
senv_out->flags |= SC_SEC_ENV_KEY_REF_PRESENT;
}
return SC_SUCCESS;
}
int sc_pkcs15_decipher(struct sc_pkcs15_card *p15card,
const struct sc_pkcs15_object *obj,
unsigned long flags,
const u8 * in, size_t inlen, u8 *out, size_t outlen)
{
sc_context_t *ctx = p15card->card->ctx;
int r;
sc_algorithm_info_t *alg_info = NULL;
sc_security_env_t senv;
const struct sc_pkcs15_prkey_info *prkey = (const struct sc_pkcs15_prkey_info *) obj->data;
unsigned long pad_flags = 0, sec_flags = 0;
LOG_FUNC_CALLED(ctx);
if (!(prkey->usage & (SC_PKCS15_PRKEY_USAGE_DECRYPT|SC_PKCS15_PRKEY_USAGE_UNWRAP)))
LOG_TEST_RET(ctx, SC_ERROR_NOT_ALLOWED, "This key cannot be used for decryption");
r = format_senv(p15card, obj, &senv, &alg_info);
LOG_TEST_RET(ctx, r, "Could not initialize security environment");
senv.operation = SC_SEC_OPERATION_DECIPHER;
r = sc_get_encoding_flags(ctx, flags, alg_info->flags, &pad_flags, &sec_flags);
LOG_TEST_RET(ctx, r, "cannot encode security operation flags");
senv.algorithm_flags = sec_flags;
r = use_key(p15card, obj, &senv, sc_decipher, in, inlen, out,
outlen);
LOG_TEST_RET(ctx, r, "use_key() failed");
/* Strip any padding */
if (pad_flags & SC_ALGORITHM_RSA_PAD_PKCS1) {
size_t s = r;
r = sc_pkcs1_strip_02_padding(ctx, out, s, out, &s);
LOG_TEST_RET(ctx, r, "Invalid PKCS#1 padding");
}
LOG_FUNC_RETURN(ctx, r);
}
/* derive one key from another. RSA can use decipher, so this is for only ECDH
* Since the value may be returned, and the call is expected to provide
* the buffer, we used the PKCS#11 convention of outlen == 0 and out == NULL
* to indicate that this is a request for the size.
* In that case r = 0, and *poutlen = expected size
*/
int sc_pkcs15_derive(struct sc_pkcs15_card *p15card,
const struct sc_pkcs15_object *obj,
unsigned long flags,
const u8 * in, size_t inlen, u8 *out,
unsigned long *poutlen)
{
sc_context_t *ctx = p15card->card->ctx;
int r;
sc_algorithm_info_t *alg_info = NULL;
sc_security_env_t senv;
const struct sc_pkcs15_prkey_info *prkey = (const struct sc_pkcs15_prkey_info *) obj->data;
unsigned long pad_flags = 0, sec_flags = 0;
LOG_FUNC_CALLED(ctx);
if (!(prkey->usage & (SC_PKCS15_PRKEY_USAGE_DERIVE)))
LOG_TEST_RET(ctx, SC_ERROR_NOT_ALLOWED, "This key cannot be used for derivation");
switch (obj->type) {
case SC_PKCS15_TYPE_PRKEY_EC:
if (out == NULL || *poutlen < (prkey->field_length + 7) / 8) {
*poutlen = (prkey->field_length + 7) / 8;
r = 0; /* say no data to return */
LOG_FUNC_RETURN(ctx, r);
}
break;
default:
LOG_TEST_RET(ctx, SC_ERROR_NOT_SUPPORTED,"Key type not supported");
}
r = format_senv(p15card, obj, &senv, &alg_info);
LOG_TEST_RET(ctx, r, "Could not initialize security environment");
senv.operation = SC_SEC_OPERATION_DERIVE;
r = sc_get_encoding_flags(ctx, flags, alg_info->flags, &pad_flags, &sec_flags);
LOG_TEST_RET(ctx, r, "cannot encode security operation flags");
senv.algorithm_flags = sec_flags;
r = use_key(p15card, obj, &senv, sc_decipher, in, inlen, out,
*poutlen);
LOG_TEST_RET(ctx, r, "use_key() failed");
/* Strip any padding */
if (pad_flags & SC_ALGORITHM_RSA_PAD_PKCS1) {
size_t s = r;
r = sc_pkcs1_strip_02_padding(ctx, out, s, out, &s);
LOG_TEST_RET(ctx, r, "Invalid PKCS#1 padding");
}
/* If card stores derived key on card, then no data is returned
* and the key must be used on the card. */
*poutlen = r;
LOG_FUNC_RETURN(ctx, r);
}
/* copied from pkcs15-cardos.c */
#define USAGE_ANY_SIGN (SC_PKCS15_PRKEY_USAGE_SIGN|\
SC_PKCS15_PRKEY_USAGE_NONREPUDIATION)
#define USAGE_ANY_DECIPHER (SC_PKCS15_PRKEY_USAGE_DECRYPT|\
SC_PKCS15_PRKEY_USAGE_UNWRAP)
int sc_pkcs15_compute_signature(struct sc_pkcs15_card *p15card,
const struct sc_pkcs15_object *obj,
unsigned long flags, const u8 *in, size_t inlen,
u8 *out, size_t outlen)
{
sc_context_t *ctx = p15card->card->ctx;
int r;
sc_security_env_t senv;
sc_algorithm_info_t *alg_info;
const struct sc_pkcs15_prkey_info *prkey = (const struct sc_pkcs15_prkey_info *) obj->data;
u8 buf[1024], *tmp;
size_t modlen;
unsigned long pad_flags = 0, sec_flags = 0;
LOG_FUNC_CALLED(ctx);
if (!(prkey->usage & (SC_PKCS15_PRKEY_USAGE_SIGN|SC_PKCS15_PRKEY_USAGE_SIGNRECOVER|
SC_PKCS15_PRKEY_USAGE_NONREPUDIATION)))
LOG_TEST_RET(ctx, SC_ERROR_NOT_ALLOWED, "This key cannot be used for signing");
r = format_senv(p15card, obj, &senv, &alg_info);
LOG_TEST_RET(ctx, r, "Could not initialize security environment");
senv.operation = SC_SEC_OPERATION_SIGN;
switch (obj->type) {
case SC_PKCS15_TYPE_PRKEY_RSA:
modlen = prkey->modulus_length / 8;
break;
case SC_PKCS15_TYPE_PRKEY_GOSTR3410:
modlen = (prkey->modulus_length + 7) / 8 * 2;
break;
case SC_PKCS15_TYPE_PRKEY_EC:
modlen = ((prkey->field_length +7) / 8) * 2; /* 2*nLen */
break;
default:
LOG_TEST_RET(ctx, SC_ERROR_NOT_SUPPORTED, "Key type not supported");
}
/* Probably never happens, but better make sure */
if (inlen > sizeof(buf) || outlen < modlen)
LOG_FUNC_RETURN(ctx, SC_ERROR_BUFFER_TOO_SMALL);
memcpy(buf, in, inlen);
/* revert data to sign when signing with the GOST key.
* TODO: can it be confirmed by the GOST standard?
* TODO: tested with RuTokenECP, has to be validated for RuToken. */
if (obj->type == SC_PKCS15_TYPE_PRKEY_GOSTR3410) {
r = sc_mem_reverse(buf, inlen);
LOG_TEST_RET(ctx, r, "Reverse memory error");
}
tmp = buf;
/* flags: the requested algo
* algo_info->flags: what is supported by the card
* senv.algorithm_flags: what the card will have to do */
/* if the card has SC_ALGORITHM_NEED_USAGE set, and the
* key is for signing and decryption, we need to emulate signing */
/* TODO: -DEE assume only RSA keys will ever use _NEED_USAGE */
sc_log(ctx, "supported algorithm flags 0x%X, private key usage 0x%X", alg_info->flags, prkey->usage);
if ((alg_info->flags & SC_ALGORITHM_NEED_USAGE) &&
((prkey->usage & USAGE_ANY_SIGN) &&
(prkey->usage & USAGE_ANY_DECIPHER)) ) {
size_t tmplen = sizeof(buf);
if (flags & SC_ALGORITHM_RSA_RAW) {
r = sc_pkcs15_decipher(p15card, obj,flags, in, inlen, out, outlen);
LOG_FUNC_RETURN(ctx, r);
}
if (modlen > tmplen)
LOG_TEST_RET(ctx, SC_ERROR_NOT_ALLOWED, "Buffer too small, needs recompile!");
r = sc_pkcs1_encode(ctx, flags, in, inlen, buf, &tmplen, modlen);
/* no padding needed - already done */
flags &= ~SC_ALGORITHM_RSA_PADS;
/* instead use raw rsa */
flags |= SC_ALGORITHM_RSA_RAW;
LOG_TEST_RET(ctx, r, "Unable to add padding");
r = sc_pkcs15_decipher(p15card, obj,flags, buf, modlen, out, outlen);
LOG_FUNC_RETURN(ctx, r);
}
/* If the card doesn't support the requested algorithm, see if we
* can strip the input so a more restrictive algo can be used */
if ((flags == (SC_ALGORITHM_RSA_PAD_PKCS1 | SC_ALGORITHM_RSA_HASH_NONE)) &&
!(alg_info->flags & (SC_ALGORITHM_RSA_RAW | SC_ALGORITHM_RSA_HASH_NONE))) {
unsigned int algo;
size_t tmplen = sizeof(buf);
r = sc_pkcs1_strip_digest_info_prefix(&algo, tmp, inlen, tmp, &tmplen);
if (r != SC_SUCCESS || algo == SC_ALGORITHM_RSA_HASH_NONE) {
sc_mem_clear(buf, sizeof(buf));
LOG_FUNC_RETURN(ctx, SC_ERROR_INVALID_DATA);
}
flags &= ~SC_ALGORITHM_RSA_HASH_NONE;
flags |= algo;
inlen = tmplen;
}
r = sc_get_encoding_flags(ctx, flags, alg_info->flags, &pad_flags, &sec_flags);
if (r != SC_SUCCESS) {
sc_mem_clear(buf, sizeof(buf));
LOG_FUNC_RETURN(ctx, r);
}
senv.algorithm_flags = sec_flags;
sc_log(ctx, "DEE flags:0x%8.8lx alg_info->flags:0x%8.8x pad:0x%8.8lx sec:0x%8.8lx",
flags, alg_info->flags, pad_flags, sec_flags);
/* add the padding bytes (if necessary) */
if (pad_flags != 0) {
size_t tmplen = sizeof(buf);
r = sc_pkcs1_encode(ctx, pad_flags, tmp, inlen, tmp, &tmplen, modlen);
SC_TEST_RET(ctx, SC_LOG_DEBUG_NORMAL, r, "Unable to add padding");
inlen = tmplen;
}
else if ( senv.algorithm == SC_ALGORITHM_RSA &&
(flags & SC_ALGORITHM_RSA_PADS) == SC_ALGORITHM_RSA_PAD_NONE) {
/* Add zero-padding if input is shorter than the modulus */
if (inlen < modlen) {
if (modlen > sizeof(buf))
return SC_ERROR_BUFFER_TOO_SMALL;
memmove(tmp+modlen-inlen, tmp, inlen);
memset(tmp, 0, modlen-inlen);
}
inlen = modlen;
}
/* PKCS#11 MECHANISMS V2.30: 6.3.1 EC Signatures
* If the length of the hash value is larger than the bit length of n, only
* the leftmost bits of the hash up to the length of n will be used. Any
* truncation is done by the token.
*/
else if (senv.algorithm == SC_ALGORITHM_EC &&
(flags & SC_ALGORITHM_ECDSA_HASH_NONE) != 0) {
inlen = MIN(inlen, (prkey->field_length+7)/8);
}
r = use_key(p15card, obj, &senv, sc_compute_signature, tmp, inlen,
out, outlen);
LOG_TEST_RET(ctx, r, "use_key() failed");
sc_mem_clear(buf, sizeof(buf));
LOG_FUNC_RETURN(ctx, r);
}
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