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dir.c
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dir.c
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/*
* dir.c: Stuff for handling EF(DIR)
*
* Copyright (C) 2001, 2002 Juha Yrjölä <juha.yrjola@iki.fi>
*
* 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
*/
#include "config.h"
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include "internal.h"
#include "asn1.h"
struct app_entry {
const u8 *aid;
size_t aid_len;
const char *desc;
};
static const struct app_entry apps[] = {
{ (const u8 *) "\xA0\x00\x00\x00\x63PKCS-15", 12, "PKCS #15" },
{ (const u8 *) "\xA0\x00\x00\x01\x77PKCS-15", 12, "Belgian eID" },
{ (const u8 *) "\x44\x46\x20\x69\x73\x73\x75\x65\x72", 9, "Portugal eID" }
};
static const struct sc_asn1_entry c_asn1_dirrecord[] = {
{ "aid", SC_ASN1_OCTET_STRING, SC_ASN1_APP | 15, 0, NULL, NULL },
{ "label", SC_ASN1_UTF8STRING, SC_ASN1_APP | 16, SC_ASN1_OPTIONAL, NULL, NULL },
{ "path", SC_ASN1_OCTET_STRING, SC_ASN1_APP | 17, SC_ASN1_OPTIONAL, NULL, NULL },
{ "ddo", SC_ASN1_OCTET_STRING, SC_ASN1_APP | 19 | SC_ASN1_CONS, SC_ASN1_OPTIONAL, NULL, NULL },
{ NULL, 0, 0, 0, NULL, NULL }
};
static const struct sc_asn1_entry c_asn1_dir[] = {
{ "dirRecord", SC_ASN1_STRUCT, SC_ASN1_APP | 1 | SC_ASN1_CONS, 0, NULL, NULL },
{ NULL, 0, 0, 0, NULL, NULL }
};
static int parse_dir_record(sc_card_t *card, u8 ** buf, size_t *buflen,
int rec_nr)
{
struct sc_asn1_entry asn1_dirrecord[5], asn1_dir[2];
sc_app_info_t *app = NULL;
struct sc_aid aid;
u8 label[128], path[128], ddo[128];
size_t label_len = sizeof(label), path_len = sizeof(path), ddo_len = sizeof(ddo);
int r;
aid.len = sizeof(aid.value);
sc_copy_asn1_entry(c_asn1_dirrecord, asn1_dirrecord);
sc_copy_asn1_entry(c_asn1_dir, asn1_dir);
sc_format_asn1_entry(asn1_dir + 0, asn1_dirrecord, NULL, 0);
sc_format_asn1_entry(asn1_dirrecord + 0, aid.value, &aid.len, 0);
sc_format_asn1_entry(asn1_dirrecord + 1, label, &label_len, 0);
sc_format_asn1_entry(asn1_dirrecord + 2, path, &path_len, 0);
sc_format_asn1_entry(asn1_dirrecord + 3, ddo, &ddo_len, 0);
r = sc_asn1_decode(card->ctx, asn1_dir, *buf, *buflen, (const u8 **) buf, buflen);
if (r == SC_ERROR_ASN1_END_OF_CONTENTS)
return r;
if (r) {
sc_debug(card->ctx, SC_LOG_DEBUG_NORMAL, "EF(DIR) parsing failed: %s\n",
sc_strerror(r));
return r;
}
app = calloc(1, sizeof(struct sc_app_info));
if (app == NULL)
return SC_ERROR_OUT_OF_MEMORY;
memcpy(&app->aid, &aid, sizeof(struct sc_aid));
if (asn1_dirrecord[1].flags & SC_ASN1_PRESENT)
app->label = strdup((char *) label);
else
app->label = NULL;
if (asn1_dirrecord[2].flags & SC_ASN1_PRESENT) {
/* application path present: ignore AID */
if (path_len > SC_MAX_PATH_SIZE) {
sc_debug(card->ctx, SC_LOG_DEBUG_NORMAL, "Application path is too long.\n");
free(app);
return SC_ERROR_INVALID_ASN1_OBJECT;
}
memcpy(app->path.value, path, path_len);
app->path.len = path_len;
app->path.type = SC_PATH_TYPE_PATH;
}
else {
/* application path not present: use AID as application path */
memcpy(app->path.value, aid.value, aid.len);
app->path.len = aid.len;
app->path.type = SC_PATH_TYPE_DF_NAME;
}
if (asn1_dirrecord[3].flags & SC_ASN1_PRESENT) {
app->ddo.value = malloc(ddo_len);
if (app->ddo.value == NULL) {
free(app);
return SC_ERROR_OUT_OF_MEMORY;
}
memcpy(app->ddo.value, ddo, ddo_len);
app->ddo.len = ddo_len;
} else {
app->ddo.value = NULL;
app->ddo.len = 0;
}
app->rec_nr = rec_nr;
card->app[card->app_count] = app;
card->app_count++;
return 0;
}
int sc_enum_apps(sc_card_t *card)
{
struct sc_context *ctx = card->ctx;
sc_path_t path;
int ef_structure;
size_t file_size, jj;
int r, ii, idx;
SC_FUNC_CALLED(ctx, SC_LOG_DEBUG_NORMAL);
if (card->app_count < 0)
card->app_count = 0;
sc_format_path("3F002F00", &path);
if (card->ef_dir != NULL) {
sc_file_free(card->ef_dir);
card->ef_dir = NULL;
}
r = sc_select_file(card, &path, &card->ef_dir);
SC_TEST_RET(ctx, SC_LOG_DEBUG_NORMAL, r, "Cannot select EF.DIR file");
if (card->ef_dir->type != SC_FILE_TYPE_WORKING_EF) {
sc_file_free(card->ef_dir);
card->ef_dir = NULL;
SC_TEST_RET(ctx, SC_LOG_DEBUG_NORMAL, SC_ERROR_INVALID_CARD, "EF(DIR) is not a working EF.");
}
ef_structure = card->ef_dir->ef_structure;
file_size = card->ef_dir->size;
if (file_size == 0)
SC_FUNC_RETURN(ctx, SC_LOG_DEBUG_NORMAL, 0);
if (ef_structure == SC_FILE_EF_TRANSPARENT) {
u8 *buf = NULL, *p;
size_t bufsize;
buf = malloc(file_size);
if (buf == NULL)
SC_FUNC_RETURN(ctx, SC_LOG_DEBUG_NORMAL, SC_ERROR_OUT_OF_MEMORY);
p = buf;
r = sc_read_binary(card, 0, buf, file_size, 0);
if (r < 0) {
free(buf);
SC_TEST_RET(ctx, SC_LOG_DEBUG_NORMAL, r, "sc_read_binary() failed");
}
bufsize = r;
while (bufsize > 0) {
if (card->app_count == SC_MAX_CARD_APPS) {
sc_debug(ctx, SC_LOG_DEBUG_NORMAL, "Too many applications on card");
break;
}
r = parse_dir_record(card, &p, &bufsize, -1);
if (r)
break;
}
if (buf)
free(buf);
}
else { /* record structure */
u8 buf[256], *p;
unsigned int rec_nr;
size_t rec_size;
for (rec_nr = 1; ; rec_nr++) {
r = sc_read_record(card, rec_nr, buf, sizeof(buf), SC_RECORD_BY_REC_NR);
if (r == SC_ERROR_RECORD_NOT_FOUND)
break;
SC_TEST_RET(card->ctx, SC_LOG_DEBUG_NORMAL, r, "read_record() failed");
if (card->app_count == SC_MAX_CARD_APPS) {
sc_debug(ctx, SC_LOG_DEBUG_NORMAL, "Too many applications on card");
break;
}
rec_size = r;
p = buf;
parse_dir_record(card, &p, &rec_size, (int)rec_nr);
}
}
/* Move known PKCS#15 applications to the head of the list */
for (ii=0, idx=0; ii<card->app_count; ii++) {
for (jj=0; jj < sizeof(apps)/sizeof(apps[0]); jj++) {
if (apps[jj].aid_len != card->app[ii]->aid.len)
continue;
if (memcmp(apps[jj].aid, card->app[ii]->aid.value, apps[jj].aid_len))
continue;
break;
}
if (ii != idx && jj < sizeof(apps)/sizeof(apps[0])) {
struct sc_app_info *tmp = card->app[idx];
card->app[idx] = card->app[ii];
card->app[ii] = tmp;
idx++;
}
}
SC_FUNC_RETURN(ctx, SC_LOG_DEBUG_NORMAL, SC_SUCCESS);
}
void sc_free_apps(sc_card_t *card)
{
int i;
for (i = 0; i < card->app_count; i++) {
if (card->app[i]->label)
free(card->app[i]->label);
if (card->app[i]->ddo.value)
free(card->app[i]->ddo.value);
free(card->app[i]);
}
card->app_count = -1;
}
static int encode_dir_record(sc_context_t *ctx, const sc_app_info_t *app,
u8 **buf, size_t *buflen)
{
struct sc_asn1_entry asn1_dirrecord[5], asn1_dir[2];
sc_app_info_t tapp = *app;
int r;
size_t label_len;
sc_copy_asn1_entry(c_asn1_dirrecord, asn1_dirrecord);
sc_copy_asn1_entry(c_asn1_dir, asn1_dir);
sc_format_asn1_entry(asn1_dir + 0, asn1_dirrecord, NULL, 1);
sc_format_asn1_entry(asn1_dirrecord + 0, (void *) tapp.aid.value, (void *) &tapp.aid.len, 1);
if (tapp.label != NULL) {
label_len = strlen(tapp.label);
sc_format_asn1_entry(asn1_dirrecord + 1, tapp.label, &label_len, 1);
}
if (tapp.path.len)
sc_format_asn1_entry(asn1_dirrecord + 2, (void *) tapp.path.value,
(void *) &tapp.path.len, 1);
if (tapp.ddo.value != NULL && tapp.ddo.len)
sc_format_asn1_entry(asn1_dirrecord + 3, (void *) tapp.ddo.value,
(void *) &tapp.ddo.len, 1);
r = sc_asn1_encode(ctx, asn1_dir, buf, buflen);
SC_TEST_RET(ctx, SC_LOG_DEBUG_NORMAL, r, "Encode DIR record error");
return SC_SUCCESS;
}
static int update_transparent(sc_card_t *card, sc_file_t *file)
{
u8 *rec, *buf = NULL, *tmp;
size_t rec_size, buf_size = 0;
int i, r;
for (i = 0; i < card->app_count; i++) {
r = encode_dir_record(card->ctx, card->app[i], &rec, &rec_size);
if (r) {
if (buf)
free(buf);
return r;
}
tmp = (u8 *) realloc(buf, buf_size + rec_size);
if (!tmp) {
if (rec)
free(rec);
if (buf)
free(buf);
return SC_ERROR_OUT_OF_MEMORY;
}
buf = tmp;
memcpy(buf + buf_size, rec, rec_size);
buf_size += rec_size;
free(rec);
rec=NULL;
}
if (file->size > buf_size) {
tmp = (u8 *) realloc(buf, file->size);
if (!tmp) {
free(buf);
return SC_ERROR_OUT_OF_MEMORY;
}
buf = tmp;
memset(buf + buf_size, 0, file->size - buf_size);
buf_size = file->size;
}
r = sc_update_binary(card, 0, buf, buf_size, 0);
free(buf);
SC_TEST_RET(card->ctx, SC_LOG_DEBUG_NORMAL, r, "Unable to update EF(DIR)");
return SC_SUCCESS;
}
static int update_single_record(sc_card_t *card, sc_app_info_t *app)
{
u8 *rec;
size_t rec_size;
int r;
r = encode_dir_record(card->ctx, app, &rec, &rec_size);
if (r)
return r;
if (app->rec_nr > 0)
r = sc_update_record(card, (unsigned int)app->rec_nr, rec, rec_size, SC_RECORD_BY_REC_NR);
else if (app->rec_nr == 0) {
/* create new record entry */
r = sc_append_record(card, rec, rec_size, 0);
if (r == SC_ERROR_NOT_SUPPORTED) {
/* if the card doesn't support APPEND RECORD we try a
* UPDATE RECORD on the next unused record (and hope
* that there is a record with this index).
*/
int rec_nr = 0, i;
for(i = 0; i < card->app_count; i++)
if (card->app[i]->rec_nr > rec_nr)
rec_nr = card->app[i]->rec_nr;
rec_nr++;
r = sc_update_record(card, (unsigned int)rec_nr, rec, rec_size, SC_RECORD_BY_REC_NR);
}
} else {
sc_debug(card->ctx, SC_LOG_DEBUG_NORMAL, "invalid record number\n");
r = SC_ERROR_INTERNAL;
}
free(rec);
SC_TEST_RET(card->ctx, SC_LOG_DEBUG_NORMAL, r, "Unable to update EF(DIR) record");
return 0;
}
static int update_records(sc_card_t *card)
{
int i, r;
for (i = 0; i < card->app_count; i++) {
r = update_single_record(card, card->app[i]);
if (r)
return r;
}
return 0;
}
int sc_update_dir(sc_card_t *card, sc_app_info_t *app)
{
sc_path_t path;
sc_file_t *file;
int r;
sc_format_path("3F002F00", &path);
r = sc_select_file(card, &path, &file);
SC_TEST_RET(card->ctx, SC_LOG_DEBUG_NORMAL, r, "unable to select EF(DIR)");
if (file->ef_structure == SC_FILE_EF_TRANSPARENT)
r = update_transparent(card, file);
else if (app == NULL)
r = update_records(card);
else
r = update_single_record(card, app);
sc_file_free(file);
return r;
}