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b66134e0005a3f9eb97f0d18e4fbbbe18e4e3e9f
vsmartcard/npa/src/npa.c
frankmorgner 495022b38a - added openssl debug code to ccid emulator 
- fixed some bugs due to changes in recent opensc version
- added support for changing pin via standard leser


git-svn-id: https://vsmartcard.svn.sourceforge.net/svnroot/vsmartcard@511 96b47cad-a561-4643-ad3b-153ac7d7599c
2011-08-30 15:55:40 +00:00

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/*
* Copyright (C) 2011 Frank Morgner
*
* This file is part of ccid.
*
* ccid is free software: you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version.
*
* ccid 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 General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* ccid. If not, see <http://www.gnu.org/licenses/>.
*/
#include "npa.h"
#include "sm.h"
#include "scutil.h"
#include "sslutil.h"
#include <libopensc/asn1.h>
#include <libopensc/log.h>
#include <libopensc/opensc.h>
#include <openssl/asn1t.h>
#include <openssl/bio.h>
#include <openssl/buffer.h>
#include <openssl/cv_cert.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/objects.h>
#include <openssl/eac.h>
#include <openssl/pace.h>
#include <openssl/cv_cert.h>
#include <string.h>
#define ASN1_APP_IMP_OPT(stname, field, type, tag) ASN1_EX_TYPE(ASN1_TFLG_IMPTAG|ASN1_TFLG_APPLICATION|ASN1_TFLG_OPTIONAL, tag, stname, field, type)
#define ASN1_APP_IMP(stname, field, type, tag) ASN1_EX_TYPE(ASN1_TFLG_IMPTAG|ASN1_TFLG_APPLICATION, tag, stname, field, type)
/*
* MSE:Set AT
*/
typedef struct npa_mse_set_at_cd_st {
ASN1_OBJECT *cryptographic_mechanism_reference;
ASN1_INTEGER *key_reference1;
ASN1_INTEGER *key_reference2;
ASN1_OCTET_STRING *auxiliary_data;
ASN1_OCTET_STRING *eph_pub_key;
CVC_CHAT *chat;
} NPA_MSE_SET_AT_C;
ASN1_SEQUENCE(NPA_MSE_SET_AT_C) = {
/* 0x80
* Cryptographic mechanism reference */
ASN1_IMP_OPT(NPA_MSE_SET_AT_C, cryptographic_mechanism_reference, ASN1_OBJECT, 0),
/* 0x83
* Reference of a public key / secret key */
ASN1_IMP_OPT(NPA_MSE_SET_AT_C, key_reference1, ASN1_INTEGER, 3),
/* 0x84
* Reference of a private key / Reference for computing a session key */
ASN1_IMP_OPT(NPA_MSE_SET_AT_C, key_reference2, ASN1_INTEGER, 4),
/* 0x67
* Auxiliary authenticated data */
ASN1_APP_IMP_OPT(NPA_MSE_SET_AT_C, auxiliary_data, ASN1_OCTET_STRING, 7),
/* 0x91
* Ephemeral Public Key */
ASN1_IMP_OPT(NPA_MSE_SET_AT_C, eph_pub_key, ASN1_OCTET_STRING, 0x11),
/* Certificate Holder Authorization Template */
ASN1_OPT(NPA_MSE_SET_AT_C, chat, CVC_CHAT),
} ASN1_SEQUENCE_END(NPA_MSE_SET_AT_C)
IMPLEMENT_ASN1_FUNCTIONS(NPA_MSE_SET_AT_C)
/*
* General Authenticate
*/
/* Protocol Command Data */
typedef struct npa_gen_auth_cd_st {
ASN1_OCTET_STRING *mapping_data;
ASN1_OCTET_STRING *eph_pub_key;
ASN1_OCTET_STRING *auth_token;
} NPA_GEN_AUTH_C_BODY;
ASN1_SEQUENCE(NPA_GEN_AUTH_C_BODY) = {
/* 0x81
* Mapping Data */
ASN1_IMP_OPT(NPA_GEN_AUTH_C_BODY, mapping_data, ASN1_OCTET_STRING, 1),
/* 0x83
* Ephemeral Public Key */
ASN1_IMP_OPT(NPA_GEN_AUTH_C_BODY, eph_pub_key, ASN1_OCTET_STRING, 3),
/* 0x85
* Authentication Token */
ASN1_IMP_OPT(NPA_GEN_AUTH_C_BODY, auth_token, ASN1_OCTET_STRING, 5),
} ASN1_SEQUENCE_END(NPA_GEN_AUTH_C_BODY)
IMPLEMENT_ASN1_FUNCTIONS(NPA_GEN_AUTH_C_BODY)
typedef NPA_GEN_AUTH_C_BODY NPA_GEN_AUTH_C;
/* 0x7C
* Dynamic Authentication Data */
ASN1_ITEM_TEMPLATE(NPA_GEN_AUTH_C) =
ASN1_EX_TEMPLATE_TYPE(
ASN1_TFLG_IMPTAG|ASN1_TFLG_APPLICATION,
0x1c, NPA_GEN_AUTH_C, NPA_GEN_AUTH_C_BODY)
ASN1_ITEM_TEMPLATE_END(NPA_GEN_AUTH_C)
IMPLEMENT_ASN1_FUNCTIONS(NPA_GEN_AUTH_C)
/* Protocol Response Data */
typedef struct npa_gen_auth_rapdu_body_st {
ASN1_OCTET_STRING *enc_nonce;
ASN1_OCTET_STRING *mapping_data;
ASN1_OCTET_STRING *eph_pub_key;
ASN1_OCTET_STRING *auth_token;
ASN1_OCTET_STRING *cur_car;
ASN1_OCTET_STRING *prev_car;
} NPA_GEN_AUTH_R_BODY;
ASN1_SEQUENCE(NPA_GEN_AUTH_R_BODY) = {
/* 0x80
* Encrypted Nonce */
ASN1_IMP_OPT(NPA_GEN_AUTH_R_BODY, enc_nonce, ASN1_OCTET_STRING, 0),
/* 0x82
* Mapping Data */
ASN1_IMP_OPT(NPA_GEN_AUTH_R_BODY, mapping_data, ASN1_OCTET_STRING, 2),
/* 0x84
* Ephemeral Public Key */
ASN1_IMP_OPT(NPA_GEN_AUTH_R_BODY, eph_pub_key, ASN1_OCTET_STRING, 4),
/* 0x86
* Authentication Token */
ASN1_IMP_OPT(NPA_GEN_AUTH_R_BODY, auth_token, ASN1_OCTET_STRING, 6),
/* 0x87
* Most recent Certification Authority Reference */
ASN1_IMP_OPT(NPA_GEN_AUTH_R_BODY, cur_car, ASN1_OCTET_STRING, 7),
/* 0x88
* Previous Certification Authority Reference */
ASN1_IMP_OPT(NPA_GEN_AUTH_R_BODY, prev_car, ASN1_OCTET_STRING, 8),
} ASN1_SEQUENCE_END(NPA_GEN_AUTH_R_BODY)
IMPLEMENT_ASN1_FUNCTIONS(NPA_GEN_AUTH_R_BODY)
typedef NPA_GEN_AUTH_R_BODY NPA_GEN_AUTH_R;
/* 0x7C
* Dynamic Authentication Data */
ASN1_ITEM_TEMPLATE(NPA_GEN_AUTH_R) =
ASN1_EX_TEMPLATE_TYPE(
ASN1_TFLG_IMPTAG|ASN1_TFLG_APPLICATION,
0x1c, NPA_GEN_AUTH_R, NPA_GEN_AUTH_R_BODY)
ASN1_ITEM_TEMPLATE_END(NPA_GEN_AUTH_R)
IMPLEMENT_ASN1_FUNCTIONS(NPA_GEN_AUTH_R)
#define maxresp SC_MAX_APDU_BUFFER_SIZE - 2
/** NPA secure messaging context */
struct npa_sm_ctx {
/** Send sequence counter */
BIGNUM *ssc;
/** EAC context */
EAC_CTX *ctx;
};
static int npa_sm_encrypt(sc_card_t *card, const struct sm_ctx *ctx,
const u8 *data, size_t datalen, u8 **enc);
static int npa_sm_decrypt(sc_card_t *card, const struct sm_ctx *ctx,
const u8 *enc, size_t enclen, u8 **data);
static int npa_sm_authenticate(sc_card_t *card, const struct sm_ctx *ctx,
const u8 *data, size_t datalen, u8 **outdata);
static int npa_sm_verify_authentication(sc_card_t *card, const struct sm_ctx *ctx,
const u8 *mac, size_t maclen,
const u8 *macdata, size_t macdatalen);
static int npa_sm_pre_transmit(sc_card_t *card, const struct sm_ctx *ctx,
sc_apdu_t *apdu);
static int npa_sm_post_transmit(sc_card_t *card, const struct sm_ctx *ctx,
sc_apdu_t *sm_apdu);
static void npa_sm_clear_free(const struct sm_ctx *ctx);
static int increment_ssc(struct npa_sm_ctx *eacsmctx);
static int decrement_ssc(struct npa_sm_ctx *eacsmctx);
static int reset_ssc(struct npa_sm_ctx *eacsmctx);
static struct npa_sm_ctx *
npa_sm_ctx_create(EAC_CTX *ctx)
{
struct npa_sm_ctx *out = malloc(sizeof *out);
if (!out)
goto err;
out->ssc = BN_new();
if (!out->ssc || reset_ssc(out) < 0)
goto err;
out->ctx = ctx;
return out;
err:
if (out) {
if (out->ssc)
BN_clear_free(out->ssc);
free(out);
}
return NULL;
}
int GetReadersPACECapabilities(u8 *bitmap)
{
if (!bitmap)
return SC_ERROR_INVALID_ARGUMENTS;
/* BitMap */
*bitmap = NPA_BITMAP_PACE|NPA_BITMAP_EID|NPA_BITMAP_ESIGN;
return SC_SUCCESS;
}
/** select and read EF.CardAccess */
int get_ef_card_access(sc_card_t *card,
u8 **ef_cardaccess, size_t *length_ef_cardaccess)
{
int r;
/* we read less bytes than possible. this is a workaround for acr 122,
* which only supports apdus of max 250 bytes */
size_t read = maxresp - 8;
sc_path_t path;
sc_file_t *file = NULL;
u8 *p;
if (!ef_cardaccess || !length_ef_cardaccess) {
r = SC_ERROR_INVALID_ARGUMENTS;
goto err;
}
memcpy(&path, sc_get_mf_path(), sizeof path);
r = sc_append_file_id(&path, FID_EF_CARDACCESS);
if (r < 0) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not create path object.");
goto err;
}
r = sc_select_file(card, &path, &file);
if (r < 0) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not select EF.CardAccess.");
goto err;
}
*length_ef_cardaccess = 0;
while(1) {
p = realloc(*ef_cardaccess, *length_ef_cardaccess + read);
if (!p) {
r = SC_ERROR_OUT_OF_MEMORY;
goto err;
}
*ef_cardaccess = p;
r = sc_read_binary(card, *length_ef_cardaccess,
*ef_cardaccess + *length_ef_cardaccess, read, 0);
if (r > 0 && r != read) {
*length_ef_cardaccess += r;
break;
}
if (r < 0) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not read EF.CardAccess.");
goto err;
}
*length_ef_cardaccess += r;
}
/* test cards only return an empty FCI template,
* so we can't determine any file proberties */
if (*length_ef_cardaccess < file->size) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Actual filesize differs from the size in file "
"proberties (%u!=%u).", *length_ef_cardaccess, file->size);
r = SC_ERROR_FILE_TOO_SMALL;
goto err;
}
/* All cards with PACE support extended length
* XXX this should better be done by the card driver */
card->caps |= SC_CARD_CAP_APDU_EXT;
r = SC_SUCCESS;
err:
if (file) {
free(file);
}
return r;
}
static int npa_mse_set_at(struct sm_ctx *oldnpactx, sc_card_t *card,
int protocol, int secret_key, const CVC_CHAT *chat, u8 *sw1, u8 *sw2)
{
sc_apdu_t apdu;
unsigned char *d = NULL;
NPA_MSE_SET_AT_C *data = NULL;
int r, tries;
memset(&apdu, 0, sizeof apdu);
if (!sw1 || !sw2) {
r = SC_ERROR_INVALID_ARGUMENTS;
goto err;
}
apdu.ins = 0x22;
apdu.p1 = 0xc1;
apdu.p2 = 0xa4;
apdu.cse = SC_APDU_CASE_3_SHORT;
apdu.flags = SC_APDU_FLAGS_NO_GET_RESP|SC_APDU_FLAGS_NO_RETRY_WL;
data = NPA_MSE_SET_AT_C_new();
if (!data) {
r = SC_ERROR_OUT_OF_MEMORY;
goto err;
}
data->cryptographic_mechanism_reference = OBJ_nid2obj(protocol);
data->key_reference1 = ASN1_INTEGER_new();
if (!data->cryptographic_mechanism_reference
|| !data->key_reference1) {
r = SC_ERROR_OUT_OF_MEMORY;
goto err;
}
if (!ASN1_INTEGER_set(data->key_reference1, secret_key)) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Error setting key reference 1 of MSE:Set AT data");
r = SC_ERROR_INTERNAL;
goto err;
}
data->chat = (CVC_CHAT *) chat;
r = i2d_NPA_MSE_SET_AT_C(data, &d);
if (r < 0) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Error encoding MSE:Set AT APDU data");
r = SC_ERROR_INTERNAL;
goto err;
}
/* The tag/length for the sequence (0x30) is omitted in the command apdu. */
/* XXX is there a OpenSSL way to get the value only or even a define for
* the tag? */
apdu.data = sc_asn1_find_tag(card->ctx, d, r, 0x30, &apdu.datalen);
apdu.lc = apdu.datalen;
bin_log(card->ctx, SC_LOG_DEBUG_NORMAL, "MSE:Set AT command data", apdu.data, apdu.datalen);
if (oldnpactx)
r = sm_transmit_apdu(oldnpactx, card, &apdu);
else
r = sc_transmit_apdu(card, &apdu);
if (r < 0)
goto err;
if (apdu.resplen) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "MSE:Set AT response data should be empty "
"(contains %u bytes)", apdu.resplen);
r = SC_ERROR_UNKNOWN_DATA_RECEIVED;
goto err;
}
*sw1 = apdu.sw1;
*sw2 = apdu.sw2;
if (apdu.sw1 == 0x63) {
if ((apdu.sw2 & 0xc0) == 0xc0) {
tries = apdu.sw2 & 0x0f;
if (tries <= 1) {
/* this is only a warning... */
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Remaining tries: %d (%s must be %s)\n",
tries, npa_secret_name(secret_key),
tries ? "resumed" : "unblocked");
}
r = SC_SUCCESS;
} else {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Unknown status bytes: SW1=%02X, SW2=%02X\n",
apdu.sw1, apdu.sw2);
r = SC_ERROR_CARD_CMD_FAILED;
goto err;
}
} else if (apdu.sw1 == 0x62 && apdu.sw2 == 0x83) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Password is deactivated\n");
r = SC_ERROR_AUTH_METHOD_BLOCKED;
goto err;
} else {
r = sc_check_sw(card, apdu.sw1, apdu.sw2);
}
err:
if (apdu.resp)
free(apdu.resp);
if (data) {
/* do not free the functions parameter chat */
data->chat = NULL;
NPA_MSE_SET_AT_C_free(data);
}
if (d)
free(d);
return r;
}
static int npa_gen_auth_1_encrypted_nonce(struct sm_ctx *oldnpactx,
sc_card_t *card, u8 **enc_nonce, size_t *enc_nonce_len)
{
sc_apdu_t apdu;
NPA_GEN_AUTH_C *c_data = NULL;
NPA_GEN_AUTH_R *r_data = NULL;
unsigned char *d = NULL, *p;
int r, l;
unsigned char resp[maxresp];
memset(&apdu, 0, sizeof apdu);
apdu.cla = 0x10;
apdu.ins = 0x86;
apdu.cse = SC_APDU_CASE_4_SHORT;
apdu.flags = SC_APDU_FLAGS_NO_GET_RESP|SC_APDU_FLAGS_NO_RETRY_WL;
c_data = NPA_GEN_AUTH_C_new();
if (!c_data) {
r = SC_ERROR_OUT_OF_MEMORY;
goto err;
}
r = i2d_NPA_GEN_AUTH_C(c_data, &d);
if (r < 0) {
r = SC_ERROR_INTERNAL;
goto err;
}
apdu.data = (const u8 *) d;
apdu.datalen = r;
apdu.lc = r;
bin_log(card->ctx, SC_LOG_DEBUG_NORMAL, "General authenticate (Encrypted Nonce) command data", apdu.data, apdu.datalen);
apdu.resplen = sizeof resp;
apdu.resp = resp;
if (oldnpactx)
r = sm_transmit_apdu(oldnpactx, card, &apdu);
else
r = sc_transmit_apdu(card, &apdu);
if (r < 0)
goto err;
r = sc_check_sw(card, apdu.sw1, apdu.sw2);
if (r < 0)
goto err;
bin_log(card->ctx, SC_LOG_DEBUG_NORMAL, "General authenticate (Encrypted Nonce) response data", apdu.resp, apdu.resplen);
if (!d2i_NPA_GEN_AUTH_R(&r_data,
(const unsigned char **) &apdu.resp, apdu.resplen)) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not parse general authenticate response data.");
r = SC_ERROR_INTERNAL;
goto err;
}
if (!r_data->enc_nonce
|| r_data->mapping_data
|| r_data->eph_pub_key
|| r_data->auth_token
|| r_data->cur_car
|| r_data->prev_car) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Response data of general authenticate for "
"step 1 should (only) contain the encrypted nonce.");
r = SC_ERROR_UNKNOWN_DATA_RECEIVED;
goto err;
}
p = r_data->enc_nonce->data;
l = r_data->enc_nonce->length;
*enc_nonce = malloc(l);
if (!*enc_nonce) {
r = SC_ERROR_OUT_OF_MEMORY;
goto err;
}
/* Flawfinder: ignore */
memcpy(*enc_nonce, p, l);
*enc_nonce_len = l;
err:
if (c_data)
NPA_GEN_AUTH_C_free(c_data);
if (d)
free(d);
if (r_data)
NPA_GEN_AUTH_R_free(r_data);
return r;
}
static int npa_gen_auth_2_map_nonce(struct sm_ctx *oldnpactx,
sc_card_t *card, const u8 *in, size_t in_len, u8 **map_data_out,
size_t *map_data_out_len)
{
sc_apdu_t apdu;
NPA_GEN_AUTH_C *c_data = NULL;
NPA_GEN_AUTH_R *r_data = NULL;
unsigned char *d = NULL, *p;
int r, l;
unsigned char resp[maxresp];
memset(&apdu, 0, sizeof apdu);
apdu.cla = 0x10;
apdu.ins = 0x86;
apdu.cse = SC_APDU_CASE_4_SHORT;
apdu.flags = SC_APDU_FLAGS_NO_GET_RESP|SC_APDU_FLAGS_NO_RETRY_WL;
c_data = NPA_GEN_AUTH_C_new();
if (!c_data) {
r = SC_ERROR_OUT_OF_MEMORY;
goto err;
}
c_data->mapping_data = ASN1_OCTET_STRING_new();
if (!c_data->mapping_data
|| !M_ASN1_OCTET_STRING_set(
c_data->mapping_data, in, in_len)) {
r = SC_ERROR_INTERNAL;
goto err;
}
r = i2d_NPA_GEN_AUTH_C(c_data, &d);
if (r < 0) {
r = SC_ERROR_INTERNAL;
goto err;
}
apdu.data = (const u8 *) d;
apdu.datalen = r;
apdu.lc = r;
bin_log(card->ctx, SC_LOG_DEBUG_NORMAL, "General authenticate (Map Nonce) command data", apdu.data, apdu.datalen);
apdu.resplen = sizeof resp;
apdu.resp = resp;
if (oldnpactx)
r = sm_transmit_apdu(oldnpactx, card, &apdu);
else
r = sc_transmit_apdu(card, &apdu);
if (r < 0)
goto err;
r = sc_check_sw(card, apdu.sw1, apdu.sw2);
if (r < 0)
goto err;
bin_log(card->ctx, SC_LOG_DEBUG_NORMAL, "General authenticate (Map Nonce) response data", apdu.resp, apdu.resplen);
if (!d2i_NPA_GEN_AUTH_R(&r_data,
(const unsigned char **) &apdu.resp, apdu.resplen)) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not parse general authenticate response data.");
r = SC_ERROR_INTERNAL;
goto err;
}
if (r_data->enc_nonce
|| !r_data->mapping_data
|| r_data->eph_pub_key
|| r_data->auth_token
|| r_data->cur_car
|| r_data->prev_car) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Response data of general authenticate for "
"step 2 should (only) contain the mapping data.");
r = SC_ERROR_UNKNOWN_DATA_RECEIVED;
goto err;
}
p = r_data->mapping_data->data;
l = r_data->mapping_data->length;
*map_data_out = malloc(l);
if (!*map_data_out) {
r = SC_ERROR_OUT_OF_MEMORY;
goto err;
}
/* Flawfinder: ignore */
memcpy(*map_data_out, p, l);
*map_data_out_len = l;
err:
if (c_data)
NPA_GEN_AUTH_C_free(c_data);
if (d)
free(d);
if (r_data)
NPA_GEN_AUTH_R_free(r_data);
return r;
}
static int npa_gen_auth_3_perform_key_agreement(
struct sm_ctx *oldnpactx, sc_card_t *card,
const u8 *in, size_t in_len, u8 **eph_pub_key_out, size_t *eph_pub_key_out_len)
{
sc_apdu_t apdu;
NPA_GEN_AUTH_C *c_data = NULL;
NPA_GEN_AUTH_R *r_data = NULL;
unsigned char *d = NULL, *p;
int r, l;
unsigned char resp[maxresp];
memset(&apdu, 0, sizeof apdu);
apdu.cla = 0x10;
apdu.ins = 0x86;
apdu.cse = SC_APDU_CASE_4_SHORT;
apdu.flags = SC_APDU_FLAGS_NO_GET_RESP|SC_APDU_FLAGS_NO_RETRY_WL;
c_data = NPA_GEN_AUTH_C_new();
if (!c_data) {
r = SC_ERROR_OUT_OF_MEMORY;
goto err;
}
c_data->eph_pub_key = ASN1_OCTET_STRING_new();
if (!c_data->eph_pub_key
|| !M_ASN1_OCTET_STRING_set(
c_data->eph_pub_key, in, in_len)) {
r = SC_ERROR_INTERNAL;
goto err;
}
r = i2d_NPA_GEN_AUTH_C(c_data, &d);
if (r < 0) {
r = SC_ERROR_INTERNAL;
goto err;
}
apdu.data = (const u8 *) d;
apdu.datalen = r;
apdu.lc = r;
bin_log(card->ctx, SC_LOG_DEBUG_NORMAL, "General authenticate (Perform Key Agreement) command data", apdu.data, apdu.datalen);
apdu.resplen = sizeof resp;
apdu.resp = resp;
if (oldnpactx)
r = sm_transmit_apdu(oldnpactx, card, &apdu);
else
r = sc_transmit_apdu(card, &apdu);
if (r < 0)
goto err;
r = sc_check_sw(card, apdu.sw1, apdu.sw2);
if (r < 0)
goto err;
bin_log(card->ctx, SC_LOG_DEBUG_NORMAL, "General authenticate (Perform Key Agreement) response data", apdu.resp, apdu.resplen);
if (!d2i_NPA_GEN_AUTH_R(&r_data,
(const unsigned char **) &apdu.resp, apdu.resplen)) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not parse general authenticate response data.");
r = SC_ERROR_INTERNAL;
goto err;
}
if (r_data->enc_nonce
|| r_data->mapping_data
|| !r_data->eph_pub_key
|| r_data->auth_token
|| r_data->cur_car
|| r_data->prev_car) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Response data of general authenticate for "
"step 3 should (only) contain the ephemeral public key.");
r = SC_ERROR_UNKNOWN_DATA_RECEIVED;
goto err;
}
p = r_data->eph_pub_key->data;
l = r_data->eph_pub_key->length;
*eph_pub_key_out = malloc(l);
if (!*eph_pub_key_out) {
r = SC_ERROR_OUT_OF_MEMORY;
goto err;
}
/* Flawfinder: ignore */
memcpy(*eph_pub_key_out, p, l);
*eph_pub_key_out_len = l;
err:
if (c_data)
NPA_GEN_AUTH_C_free(c_data);
if (d)
free(d);
if (r_data)
NPA_GEN_AUTH_R_free(r_data);
return r;
}
static int npa_gen_auth_4_mutual_authentication(
struct sm_ctx *oldnpactx, sc_card_t *card,
const u8 *in, size_t in_len, u8 **auth_token_out,
size_t *auth_token_out_len, u8 **recent_car, size_t *recent_car_len,
u8 **prev_car, size_t *prev_car_len)
{
sc_apdu_t apdu;
NPA_GEN_AUTH_C *c_data = NULL;
NPA_GEN_AUTH_R *r_data = NULL;
unsigned char *d = NULL, *p;
int r, l;
unsigned char resp[maxresp];
memset(&apdu, 0, sizeof apdu);
apdu.cla = 0x10;
apdu.ins = 0x86;
apdu.cse = SC_APDU_CASE_4_SHORT;
apdu.flags = SC_APDU_FLAGS_NO_GET_RESP|SC_APDU_FLAGS_NO_RETRY_WL;
c_data = NPA_GEN_AUTH_C_new();
if (!c_data) {
r = SC_ERROR_OUT_OF_MEMORY;
goto err;
}
apdu.cla = 0;
c_data->auth_token = ASN1_OCTET_STRING_new();
if (!c_data->auth_token
|| !M_ASN1_OCTET_STRING_set(
c_data->auth_token, in, in_len)) {
r = SC_ERROR_INTERNAL;
goto err;
}
r = i2d_NPA_GEN_AUTH_C(c_data, &d);
if (r < 0) {
r = SC_ERROR_INTERNAL;
goto err;
}
apdu.data = (const u8 *) d;
apdu.datalen = r;
apdu.lc = r;
bin_log(card->ctx, SC_LOG_DEBUG_NORMAL, "General authenticate (Perform Key Agreement) command data", apdu.data, apdu.datalen);
apdu.resplen = sizeof resp;
apdu.resp = resp;
if (oldnpactx)
r = sm_transmit_apdu(oldnpactx, card, &apdu);
else
r = sc_transmit_apdu(card, &apdu);
if (r < 0)
goto err;
r = sc_check_sw(card, apdu.sw1, apdu.sw2);
if (r < 0)
goto err;
bin_log(card->ctx, SC_LOG_DEBUG_NORMAL, "General authenticate (Perform Key Agreement) response data", apdu.resp, apdu.resplen);
if (!d2i_NPA_GEN_AUTH_R(&r_data,
(const unsigned char **) &apdu.resp, apdu.resplen)) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not parse general authenticate response data.");
r = SC_ERROR_INTERNAL;
goto err;
}
if (r_data->enc_nonce
|| r_data->mapping_data
|| r_data->eph_pub_key
|| !r_data->auth_token) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Response data of general authenticate for "
"step 4 should (only) contain the authentication token.");
r = SC_ERROR_UNKNOWN_DATA_RECEIVED;
goto err;
}
p = r_data->auth_token->data;
l = r_data->auth_token->length;
/* XXX CAR sould be returned as result in some way */
if (r_data->cur_car) {
bin_log(card->ctx, SC_LOG_DEBUG_NORMAL, "Most recent Certificate Authority Reference",
r_data->cur_car->data, r_data->cur_car->length);
*recent_car = malloc(r_data->cur_car->length);
if (!*recent_car) {
r = SC_ERROR_OUT_OF_MEMORY;
goto err;
}
/* Flawfinder: ignore */
memcpy(*recent_car, r_data->cur_car->data, r_data->cur_car->length);
*recent_car_len = r_data->cur_car->length;
} else
*recent_car_len = 0;
if (r_data->prev_car) {
bin_log(card->ctx, SC_LOG_DEBUG_NORMAL, "Previous Certificate Authority Reference",
r_data->prev_car->data, r_data->prev_car->length);
*prev_car = malloc(r_data->prev_car->length);
if (!*prev_car) {
r = SC_ERROR_OUT_OF_MEMORY;
goto err;
}
/* Flawfinder: ignore */
memcpy(*prev_car, r_data->prev_car->data, r_data->prev_car->length);
*prev_car_len = r_data->prev_car->length;
} else
*prev_car_len = 0;
*auth_token_out = malloc(l);
if (!*auth_token_out) {
r = SC_ERROR_OUT_OF_MEMORY;
goto err;
}
/* Flawfinder: ignore */
memcpy(*auth_token_out, p, l);
*auth_token_out_len = l;
err:
if (c_data)
NPA_GEN_AUTH_C_free(c_data);
if (d)
free(d);
if (r_data)
NPA_GEN_AUTH_R_free(r_data);
return r;
}
int
npa_reset_retry_counter(struct sm_ctx *ctx, sc_card_t *card,
enum s_type pin_id, int ask_for_secret,
const char *new, size_t new_len)
{
sc_apdu_t apdu;
char *p = NULL;
int r;
if (ask_for_secret && (!new || !new_len)) {
p = malloc(MAX_PIN_LEN+1);
if (!p) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Not enough memory for new PIN.\n");
return SC_ERROR_OUT_OF_MEMORY;
}
if (0 > EVP_read_pw_string_min(p,
MIN_PIN_LEN, MAX_PIN_LEN+1,
"Please enter your new PIN: ", 0)) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not read new PIN.\n");
free(p);
return SC_ERROR_INTERNAL;
}
new_len = strlen(p);
if (new_len > MAX_PIN_LEN)
return SC_ERROR_INVALID_PIN_LENGTH;
new = p;
}
memset(&apdu, 0, sizeof apdu);
apdu.ins = 0x2C;
apdu.p2 = pin_id;
apdu.data = (u8 *) new;
apdu.datalen = new_len;
apdu.lc = apdu.datalen;
apdu.flags = SC_APDU_FLAGS_NO_GET_RESP|SC_APDU_FLAGS_NO_RETRY_WL;
if (new_len) {
apdu.p1 = 0x02;
apdu.cse = SC_APDU_CASE_3_SHORT;
} else {
apdu.p1 = 0x03;
apdu.cse = SC_APDU_CASE_1;
}
r = sm_transmit_apdu(ctx, card, &apdu);
if (p) {
OPENSSL_cleanse(p, new_len);
free(p);
}
return r;
}
static PACE_SEC *
get_psec(sc_card_t *card, const char *pin, size_t length_pin, enum s_type pin_id)
{
char *p = NULL;
PACE_SEC *r;
int sc_result;
/* Flawfinder: ignore */
char buf[MAX_MRZ_LEN > 32 ? MAX_MRZ_LEN : 32];
if (!length_pin || !pin) {
if (0 > snprintf(buf, sizeof buf, "Please enter your %s: ",
npa_secret_name(pin_id))) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not create password prompt.\n");
return NULL;
}
p = malloc(MAX_MRZ_LEN+1);
if (!p) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Not enough memory for %s.\n",
npa_secret_name(pin_id));
return NULL;
}
if (0 > EVP_read_pw_string_min(p, 0, MAX_MRZ_LEN, buf, 0)) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not read %s.\n",
npa_secret_name(pin_id));
return NULL;
}
length_pin = strlen(p);
if (length_pin > MAX_MRZ_LEN) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "MRZ too long");
return NULL;
}
pin = p;
}
r = PACE_SEC_new(pin, length_pin, pin_id);
if (p) {
OPENSSL_cleanse(p, length_pin);
free(p);
}
return r;
}
int EstablishPACEChannel(struct sm_ctx *oldnpactx, sc_card_t *card,
struct establish_pace_channel_input pace_input,
struct establish_pace_channel_output *pace_output,
struct sm_ctx *sctx)
{
u8 *p = NULL;
EAC_CTX *eac_ctx = NULL;
BUF_MEM *enc_nonce = NULL, *mdata = NULL, *mdata_opp = NULL,
*token_opp = NULL, *token = NULL, *pub = NULL, *pub_opp = NULL,
*comp_pub = NULL, *comp_pub_opp = NULL, *hash_cert_desc = NULL;
PACE_SEC *sec = NULL;
CVC_CHAT *chat = NULL;
BIO *bio_stdout = NULL;
CVC_CERTIFICATE_DESCRIPTION *desc = NULL;
int r;
if (!card)
return SC_ERROR_CARD_NOT_PRESENT;
if (!pace_output || !sctx)
return SC_ERROR_INVALID_ARGUMENTS;
/* show description in advance to give the user more time to read it...
* This behaviour differs from TR-03119 v1.1 p. 44. */
if (pace_input.certificate_description_length &&
pace_input.certificate_description) {
if (!d2i_CVC_CERTIFICATE_DESCRIPTION(&desc,
&pace_input.certificate_description,
pace_input.certificate_description_length)) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not parse certificate description.");
r = SC_ERROR_INTERNAL;
goto err;
}
if (!bio_stdout)
bio_stdout = BIO_new_fp(stdout, BIO_NOCLOSE);
if (!bio_stdout) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not create output buffer.");
ssl_error(card->ctx);
r = SC_ERROR_INTERNAL;
goto err;
}
printf("Certificate Description\n");
switch(certificate_description_print(bio_stdout, desc, 8)) {
case -1:
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not print certificate description.");
ssl_error(card->ctx);
r = SC_ERROR_INTERNAL;
goto err;
case 0:
break;
case 1:
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Certificate description in "
"HTML format can not (yet) be handled.");
r = SC_ERROR_NOT_SUPPORTED;
goto err;
case 2:
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Certificate description in "
"PDF format can not (yet) be handled.");
r = SC_ERROR_NOT_SUPPORTED;
goto err;
default:
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Certificate description in "
"unknown format can not (yet) be handled.");
r = SC_ERROR_NOT_SUPPORTED;
goto err;
}
hash_cert_desc = EAC_hash_certificate_description(
pace_input.certificate_description,
pace_input.certificate_description_length);
if (!hash_cert_desc) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not hash certificate description.");
ssl_error(card->ctx);
r = SC_ERROR_INTERNAL;
goto err;
}
p = realloc(pace_output->hash_cert_desc, hash_cert_desc->length);
if (!p) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Not enough memory for hash of certificate description.\n");
r = SC_ERROR_OUT_OF_MEMORY;
goto err;
}
pace_output->hash_cert_desc = p;
pace_output->hash_cert_desc_len = hash_cert_desc->length;
}
/* show chat in advance to give the user more time to read it...
* This behaviour differs from TR-03119 v1.1 p. 44. */
if (pace_input.chat_length && pace_input.chat) {
if (!bio_stdout)
bio_stdout = BIO_new_fp(stdout, BIO_NOCLOSE);
if (!bio_stdout) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not create output buffer.");
ssl_error(card->ctx);
r = SC_ERROR_INTERNAL;
goto err;
}
if (!d2i_CVC_CHAT(&chat, (const unsigned char **) &pace_input.chat,
pace_input.chat_length)) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not parse card holder authorization template (CHAT).");
r = SC_ERROR_INTERNAL;
goto err;
}
printf("Card holder authorization template (CHAT)\n");
if (!cvc_chat_print(bio_stdout, chat, 8)) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not print card holder authorization template (CHAT).");
ssl_error(card->ctx);
r = SC_ERROR_INTERNAL;
goto err;
}
}
if (!pace_output->ef_cardaccess_length || !pace_output->ef_cardaccess) {
r = get_ef_card_access(card, &pace_output->ef_cardaccess,
&pace_output->ef_cardaccess_length);
if (r < 0) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not get EF.CardAccess.");
goto err;
}
}
bin_log(card->ctx, SC_LOG_DEBUG_NORMAL, "EF.CardAccess", pace_output->ef_cardaccess,
pace_output->ef_cardaccess_length);
eac_ctx = EAC_CTX_new();
if (!eac_ctx
|| !EAC_CTX_init_ef_cardaccess(pace_output->ef_cardaccess,
pace_output->ef_cardaccess_length, eac_ctx)) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not parse EF.CardAccess.");
ssl_error(card->ctx);
r = SC_ERROR_INTERNAL;
goto err;
}
eac_ctx->tr_version = pace_input.tr_version;
r = npa_mse_set_at(oldnpactx, card, eac_ctx->pace_ctx->protocol, pace_input.pin_id,
chat, &pace_output->mse_set_at_sw1, &pace_output->mse_set_at_sw2);
if (r < 0) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not select protocol proberties "
"(MSE: Set AT failed).");
goto err;
}
enc_nonce = BUF_MEM_new();
if (!enc_nonce) {
r = SC_ERROR_INTERNAL;
goto err;
}
r = npa_gen_auth_1_encrypted_nonce(oldnpactx, card, (u8 **) &enc_nonce->data,
&enc_nonce->length);
if (r < 0) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not get encrypted nonce from card "
"(General Authenticate step 1 failed).");
goto err;
}
bin_log(card->ctx, SC_LOG_DEBUG_NORMAL, "Encrypted nonce from MRTD", (u8 *)enc_nonce->data, enc_nonce->length);
enc_nonce->max = enc_nonce->length;
sec = get_psec(card, (char *) pace_input.pin, pace_input.pin_length,
pace_input.pin_id);
if (!sec) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not encode PACE secret.");
ssl_error(card->ctx);
r = SC_ERROR_INTERNAL;
goto err;
}
if (!PACE_STEP2_dec_nonce(eac_ctx, sec, enc_nonce)) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not decrypt MRTD's nonce.");
ssl_error(card->ctx);
r = SC_ERROR_INTERNAL;
goto err;
}
mdata_opp = BUF_MEM_new();
mdata = PACE_STEP3A_generate_mapping_data(eac_ctx);
if (!mdata || !mdata_opp) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not generate mapping data.");
ssl_error(card->ctx);
r = SC_ERROR_INTERNAL;
goto err;
}
r = npa_gen_auth_2_map_nonce(oldnpactx, card, (u8 *) mdata->data, mdata->length,
(u8 **) &mdata_opp->data, &mdata_opp->length);
if (r < 0) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not exchange mapping data with card "
"(General Authenticate step 2 failed).");
goto err;
}
mdata_opp->max = mdata_opp->length;
bin_log(card->ctx, SC_LOG_DEBUG_NORMAL, "Mapping data from MRTD", (u8 *) mdata_opp->data, mdata_opp->length);
if (!PACE_STEP3A_map_generator(eac_ctx, mdata_opp)) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not map generator.");
ssl_error(card->ctx);
r = SC_ERROR_INTERNAL;
goto err;
}
pub = PACE_STEP3B_generate_ephemeral_key(eac_ctx);
pub_opp = BUF_MEM_new();
if (!pub || !pub_opp) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not generate ephemeral domain parameter or "
"ephemeral key pair.");
ssl_error(card->ctx);
r = SC_ERROR_INTERNAL;
goto err;
}
r = npa_gen_auth_3_perform_key_agreement(oldnpactx, card, (u8 *) pub->data, pub->length,
(u8 **) &pub_opp->data, &pub_opp->length);
if (r < 0) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not exchange ephemeral public key with card "
"(General Authenticate step 3 failed).");
goto err;
}
pub_opp->max = pub_opp->length;
bin_log(card->ctx, SC_LOG_DEBUG_NORMAL, "Ephemeral public key from MRTD", (u8 *) pub_opp->data, pub_opp->length);
if (!PACE_STEP3B_compute_shared_secret(eac_ctx, pub_opp)
|| !PACE_STEP3C_derive_keys(eac_ctx)) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not compute ephemeral shared secret or "
"derive keys for encryption and authentication.");
ssl_error(card->ctx);
r = SC_ERROR_INTERNAL;
goto err;
}
token = PACE_STEP3D_compute_authentication_token(eac_ctx, pub_opp);
token_opp = BUF_MEM_new();
if (!token || !token_opp) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not compute authentication token.");
ssl_error(card->ctx);
r = SC_ERROR_INTERNAL;
goto err;
}
r = npa_gen_auth_4_mutual_authentication(oldnpactx, card, (u8 *) token->data, token->length,
(u8 **) &token_opp->data, &token_opp->length,
&pace_output->recent_car, &pace_output->recent_car_length,
&pace_output->previous_car, &pace_output->previous_car_length);
if (r < 0) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not exchange authentication token with card "
"(General Authenticate step 4 failed).");
goto err;
}
token_opp->max = token_opp->length;
if (!PACE_STEP3D_verify_authentication_token(eac_ctx, token_opp)) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not verify authentication token.");
ssl_error(card->ctx);
r = SC_ERROR_INTERNAL;
goto err;
}
/* Initialize secure channel */
if (!EAC_CTX_set_encryption_ctx(eac_ctx, EAC_ID_PACE)) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not initialize encryption.");
ssl_error(card->ctx);
r = SC_ERROR_INTERNAL;
goto err;
}
/* Identifier for ICC and PCD */
comp_pub = EAC_Comp(eac_ctx, EAC_ID_PACE, pub);
comp_pub_opp = EAC_Comp(eac_ctx, EAC_ID_PACE, pub_opp);
if (!comp_pub || !comp_pub_opp) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not compress public keys for identification.");
ssl_error(card->ctx);
r = SC_ERROR_INTERNAL;
goto err;
}
p = realloc(pace_output->id_icc, comp_pub_opp->length);
if (!p) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Not enough memory for ID ICC.\n");
return SC_ERROR_OUT_OF_MEMORY;
}
pace_output->id_icc = p;
pace_output->id_icc_length = comp_pub_opp->length;
/* Flawfinder: ignore */
memcpy(pace_output->id_icc, comp_pub_opp->data, comp_pub_opp->length);
bin_log(card->ctx, SC_LOG_DEBUG_NORMAL, "ID ICC", pace_output->id_icc,
pace_output->id_icc_length);
p = realloc(pace_output->id_pcd, comp_pub->length);
if (!p) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Not enough memory for ID PCD.\n");
return SC_ERROR_OUT_OF_MEMORY;
}
pace_output->id_pcd = p;
pace_output->id_pcd_length = comp_pub->length;
/* Flawfinder: ignore */
memcpy(pace_output->id_pcd, comp_pub->data, comp_pub->length);
bin_log(card->ctx, SC_LOG_DEBUG_NORMAL, "ID PCD", pace_output->id_pcd,
pace_output->id_pcd_length);
sctx->priv_data = npa_sm_ctx_create(eac_ctx);
if (!sctx->priv_data) {
r = SC_ERROR_OUT_OF_MEMORY;
goto err;
}
sctx->authenticate = npa_sm_authenticate;
sctx->encrypt = npa_sm_encrypt;
sctx->decrypt = npa_sm_decrypt;
sctx->verify_authentication = npa_sm_verify_authentication;
sctx->pre_transmit = npa_sm_pre_transmit;
sctx->post_transmit = npa_sm_post_transmit;
sctx->clear_free = npa_sm_clear_free;
sctx->padding_indicator = SM_ISO_PADDING;
sctx->block_length = EVP_CIPHER_block_size(eac_ctx->key_ctx->cipher);
sctx->active = 1;
err:
if (enc_nonce)
BUF_MEM_free(enc_nonce);
if (mdata)
BUF_MEM_free(mdata);
if (mdata_opp)
BUF_MEM_free(mdata_opp);
if (token_opp)
BUF_MEM_free(token_opp);
if (token)
BUF_MEM_free(token);
if (pub)
BUF_MEM_free(pub);
if (pub_opp)
BUF_MEM_free(pub_opp);
if (comp_pub_opp)
BUF_MEM_free(comp_pub_opp);
if (comp_pub)
BUF_MEM_free(comp_pub);
if (hash_cert_desc)
BUF_MEM_free(hash_cert_desc);
if (sec)
PACE_SEC_clear_free(sec);
if (bio_stdout)
BIO_free_all(bio_stdout);
if (r < 0) {
if (eac_ctx)
EAC_CTX_clear_free(eac_ctx);
if (sctx->priv_data)
npa_sm_clear_free(sctx->priv_data);
}
return r;
}
static const char *MRZ_name = "MRZ";
static const char *PIN_name = "PIN";
static const char *PUK_name = "PUK";
static const char *CAN_name = "CAN";
static const char *UNDEF_name = "UNDEF";
const char *npa_secret_name(enum s_type pin_id) {
switch (pin_id) {
case PACE_MRZ:
return MRZ_name;
case PACE_PUK:
return PUK_name;
case PACE_PIN:
return PIN_name;
case PACE_CAN:
return CAN_name;
default:
return UNDEF_name;
}
}
int
increment_ssc(struct npa_sm_ctx *eacsmctx)
{
if (!eacsmctx)
return SC_ERROR_INVALID_ARGUMENTS;
BN_add_word(eacsmctx->ssc, 1);
return SC_SUCCESS;
}
int
decrement_ssc(struct npa_sm_ctx *eacsmctx)
{
if (!eacsmctx)
return SC_ERROR_INVALID_ARGUMENTS;
BN_sub_word(eacsmctx->ssc, 1);
return SC_SUCCESS;
}
int
reset_ssc(struct npa_sm_ctx *eacsmctx)
{
if (!eacsmctx)
return SC_ERROR_INVALID_ARGUMENTS;
BN_zero(eacsmctx->ssc);
return SC_SUCCESS;
}
static int
npa_sm_encrypt(sc_card_t *card, const struct sm_ctx *ctx,
const u8 *data, size_t datalen, u8 **enc)
{
BUF_MEM *encbuf = NULL, *databuf = NULL;
u8 *p = NULL;
int r;
if (!ctx || !enc || !ctx->priv_data) {
r = SC_ERROR_INVALID_ARGUMENTS;
goto err;
}
struct npa_sm_ctx *eacsmctx = ctx->priv_data;
databuf = BUF_MEM_create_init(data, datalen);
encbuf = EAC_encrypt(eacsmctx->ctx, eacsmctx->ssc, databuf);
if (!databuf || !encbuf) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not encrypt data.");
ssl_error(card->ctx);
r = SC_ERROR_INTERNAL;
goto err;
}
p = realloc(*enc, encbuf->length);
if (!p) {
r = SC_ERROR_OUT_OF_MEMORY;
goto err;
}
*enc = p;
/* Flawfinder: ignore */
memcpy(*enc, encbuf->data, encbuf->length);
r = encbuf->length;
err:
if (databuf) {
OPENSSL_cleanse(databuf->data, databuf->max);
BUF_MEM_free(databuf);
}
if (encbuf)
BUF_MEM_free(encbuf);
return r;
}
static int
npa_sm_decrypt(sc_card_t *card, const struct sm_ctx *ctx,
const u8 *enc, size_t enclen, u8 **data)
{
BUF_MEM *encbuf = NULL, *databuf = NULL;
u8 *p = NULL;
int r;
if (!ctx || !enc || !ctx->priv_data || !data) {
r = SC_ERROR_INVALID_ARGUMENTS;
goto err;
}
struct npa_sm_ctx *eacsmctx = ctx->priv_data;
encbuf = BUF_MEM_create_init(enc, enclen);
databuf = EAC_decrypt(eacsmctx->ctx, eacsmctx->ssc, encbuf);
if (!encbuf || !databuf) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not decrypt data.");
ssl_error(card->ctx);
r = SC_ERROR_INTERNAL;
goto err;
}
p = realloc(*data, databuf->length);
if (!p) {
r = SC_ERROR_OUT_OF_MEMORY;
goto err;
}
*data = p;
/* Flawfinder: ignore */
memcpy(*data, databuf->data, databuf->length);
r = databuf->length;
err:
if (databuf) {
OPENSSL_cleanse(databuf->data, databuf->max);
BUF_MEM_free(databuf);
}
if (encbuf)
BUF_MEM_free(encbuf);
return r;
}
static int
npa_sm_authenticate(sc_card_t *card, const struct sm_ctx *ctx,
const u8 *data, size_t datalen, u8 **macdata)
{
BUF_MEM *macbuf = NULL;
u8 *p = NULL, *ssc = NULL;
int r;
if (!ctx || !ctx->priv_data || !macdata) {
r = SC_ERROR_INVALID_ARGUMENTS;
goto err;
}
struct npa_sm_ctx *eacsmctx = ctx->priv_data;
macbuf = EAC_authenticate(eacsmctx->ctx, eacsmctx->ssc, data, datalen);
if (!macbuf) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE,
"Could not compute message authentication code (MAC).");
ssl_error(card->ctx);
r = SC_ERROR_INTERNAL;
goto err;
}
p = realloc(*macdata, macbuf->length);
if (!p) {
r = SC_ERROR_OUT_OF_MEMORY;
goto err;
}
*macdata = p;
/* Flawfinder: ignore */
memcpy(*macdata, macbuf->data, macbuf->length);
r = macbuf->length;
err:
if (macbuf)
BUF_MEM_free(macbuf);
if (ssc)
free(ssc);
return r;
}
static int
npa_sm_verify_authentication(sc_card_t *card, const struct sm_ctx *ctx,
const u8 *mac, size_t maclen,
const u8 *macdata, size_t macdatalen)
{
int r;
char *p;
BUF_MEM *my_mac = NULL;
if (!ctx || !ctx->priv_data) {
r = SC_ERROR_INVALID_ARGUMENTS;
goto err;
}
struct npa_sm_ctx *eacsmctx = ctx->priv_data;
my_mac = EAC_authenticate(eacsmctx->ctx, eacsmctx->ssc, macdata,
macdatalen);
if (!my_mac) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE,
"Could not compute message authentication code (MAC) for verification.");
ssl_error(card->ctx);
r = SC_ERROR_INTERNAL;
goto err;
}
if (my_mac->length != maclen ||
memcmp(my_mac->data, mac, maclen) != 0) {
r = SC_ERROR_OBJECT_NOT_VALID;
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE,
"Authentication data not verified");
goto err;
}
sc_debug(card->ctx, SC_LOG_DEBUG_NORMAL, "Authentication data verified");
r = SC_SUCCESS;
err:
if (my_mac)
BUF_MEM_free(my_mac);
return r;
}
static int
npa_sm_pre_transmit(sc_card_t *card, const struct sm_ctx *ctx,
sc_apdu_t *apdu)
{
SC_FUNC_RETURN(card->ctx, SC_LOG_DEBUG_NORMAL,
increment_ssc(ctx->priv_data));
}
static int
npa_sm_post_transmit(sc_card_t *card, const struct sm_ctx *ctx,
sc_apdu_t *sm_apdu)
{
SC_FUNC_RETURN(card->ctx, SC_LOG_DEBUG_NORMAL,
increment_ssc(ctx->priv_data));
}
static void
npa_sm_clear_free(const struct sm_ctx *ctx)
{
if (ctx) {
struct npa_sm_ctx *eacsmctx = ctx->priv_data;
EAC_CTX_clear_free(eacsmctx->ctx);
if (eacsmctx->ssc)
BN_clear_free(eacsmctx->ssc);
free(eacsmctx);
}
}
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