Osmocom Remote SIM Software Suite https://osmocom.org/projects/osmo-remsim
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osmo-remsim/src/bankd/bankd_pcsc.c

341 lines
8.4 KiB

/* (C) 2018-2020 by Harald Welte <laforge@gnumonks.org>
*
* All Rights Reserved
*
* SPDX-License-Identifier: GPL-2.0+
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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.
*
*/
#include <osmocom/core/linuxlist.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/utils.h>
#include <csv.h>
#include <regex.h>
#include <errno.h>
#include "bankd.h"
struct pcsc_slot_name {
struct llist_head list;
/* RSPRO bank slot number */
struct bank_slot slot;
/* String name of the reader in PC/SC world */
const char *name_regex;
};
/* return a talloc-allocated string containing human-readable POSIX regex error */
static char *get_regerror(void *ctx, int errcode, regex_t *compiled)
{
size_t len = regerror(errcode, compiled, NULL, 0);
char *buffer = talloc_size(ctx, len);
OSMO_ASSERT(buffer);
regerror(errcode, compiled, buffer, len);
return buffer;
}
enum parser_state_name {
ST_NONE,
ST_BANK_NR,
ST_SLOT_NR,
ST_PCSC_NAME,
};
struct parser_state {
struct bankd *bankd;
enum parser_state_name state;
struct pcsc_slot_name *cur;
};
static void parser_state_init(struct parser_state *ps)
{
ps->state = ST_BANK_NR;
ps->cur = NULL;
}
static void cb1(void *s, size_t len, void *data)
{
char *field = (char *) s;
struct parser_state *ps = data;
switch (ps->state) {
case ST_BANK_NR:
OSMO_ASSERT(!ps->cur);
ps->cur = talloc_zero(ps->bankd, struct pcsc_slot_name);
OSMO_ASSERT(ps->cur);
ps->cur->slot.bank_id = atoi(field);
ps->state = ST_SLOT_NR;
break;
case ST_SLOT_NR:
OSMO_ASSERT(ps->cur);
ps->cur->slot.slot_nr = atoi(field);
ps->state = ST_PCSC_NAME;
break;
case ST_PCSC_NAME:
OSMO_ASSERT(ps->cur);
ps->cur->name_regex = talloc_strdup(ps->cur, field);
break;
default:
OSMO_ASSERT(0);
}
}
static void cb2(int c, void *data)
{
struct parser_state *ps = data;
struct pcsc_slot_name *sn = ps->cur;
regex_t compiled_name;
int rc;
LOGP(DMAIN, LOGL_INFO, "PC/SC slot name: %u/%u -> regex '%s'\n",
sn->slot.bank_id, sn->slot.slot_nr, sn->name_regex);
memset(&compiled_name, 0, sizeof(compiled_name));
rc = regcomp(&compiled_name, sn->name_regex, REG_EXTENDED);
if (rc != 0) {
char *errmsg = get_regerror(sn, rc, &compiled_name);
LOGP(DMAIN, LOGL_ERROR, "Error compiling regex '%s': %s - Ignoring\n",
sn->name_regex, errmsg);
talloc_free(errmsg);
talloc_free(sn);
} else {
llist_add_tail(&sn->list, &ps->bankd->pcsc_slot_names);
}
regfree(&compiled_name);
ps->state = ST_BANK_NR;
ps->cur = NULL;
}
int bankd_pcsc_read_slotnames(struct bankd *bankd, const char *csv_file)
{
FILE *fp;
struct csv_parser p;
char buf[1024];
size_t bytes_read;
struct parser_state ps;
if (csv_init(&p, CSV_APPEND_NULL) != 0) {
LOGP(DMAIN, LOGL_FATAL, "Error during csv_init\n");
return -1;
}
fp = fopen(csv_file, "rb");
if (!fp) {
LOGP(DMAIN, LOGL_FATAL, "Error opening %s: %s\n", csv_file, strerror(errno));
return -1;
}
parser_state_init(&ps);
ps.bankd = bankd;
while ((bytes_read = fread(buf, 1, sizeof(buf), fp)) > 0) {
if (csv_parse(&p, buf, bytes_read, cb1, cb2, &ps) != bytes_read) {
LOGP(DMAIN, LOGL_FATAL, "Error parsing bankd PC/SC CSV: %s\n",
csv_strerror(csv_error(&p)));
fclose(fp);
return -1;
}
}
csv_fini(&p, cb1, cb2, &ps);
fclose(fp);
csv_free(&p);
return 0;
}
const char *bankd_pcsc_get_slot_name(struct bankd *bankd, const struct bank_slot *slot)
{
struct pcsc_slot_name *cur;
llist_for_each_entry(cur, &bankd->pcsc_slot_names, list) {
if (bank_slot_equals(&cur->slot, slot))
return cur->name_regex;
}
return NULL;
}
#include <wintypes.h>
#include <winscard.h>
#include <pcsclite.h>
#define LOGW_PCSC_ERROR(w, rv, text) \
LOGW((w), text ": %s (0x%lX)\n", pcsc_stringify_error(rv), rv)
#define PCSC_ERROR(w, rv, text) \
if (rv != SCARD_S_SUCCESS) { \
LOGW_PCSC_ERROR(w, rv, text); \
goto end; \
} else { \
LOGW((w), text ": OK\n"); \
}
static DWORD bankd_share_mode(struct bankd *bankd)
{
if (bankd->cfg.permit_shared_pcsc)
return SCARD_SHARE_SHARED;
else
return SCARD_SHARE_EXCLUSIVE;
}
static int pcsc_get_atr(struct bankd_worker *worker)
{
long rc;
char pbReader[MAX_READERNAME];
/* use DWORD type as this is what the PC/SC API expects */
DWORD dwReaderLen = sizeof(pbReader);
DWORD dwAtrLen = worker->card.atr_len = sizeof(worker->card.atr);
DWORD dwState, dwProt;
rc = SCardStatus(worker->reader.pcsc.hCard, pbReader, &dwReaderLen, &dwState, &dwProt,
worker->card.atr, &dwAtrLen);
PCSC_ERROR(worker, rc, "SCardStatus")
worker->card.atr_len = dwAtrLen;
LOGW(worker, "Card ATR: %s\n", osmo_hexdump_nospc(worker->card.atr, worker->card.atr_len));
end:
return rc;
}
static int pcsc_connect_slot_regex(struct bankd_worker *worker)
{
DWORD dwReaders = SCARD_AUTOALLOCATE;
LPSTR mszReaders = NULL;
regex_t compiled_name;
int result = -1;
LONG rc;
char *p;
LOGW(worker, "Attempting to find card/slot using regex '%s'\n", worker->reader.name);
rc = regcomp(&compiled_name, worker->reader.name, REG_EXTENDED);
if (rc != 0) {
LOGW(worker, "Error compiling RegEx over name '%s'\n", worker->reader.name);
return -EINVAL;
}
rc = SCardListReaders(worker->reader.pcsc.hContext, NULL, (LPSTR)&mszReaders, &dwReaders);
if (rc != SCARD_S_SUCCESS) {
LOGW_PCSC_ERROR(worker, rc, "SCardListReaders");
goto out_regfree;
}
p = mszReaders;
while (*p) {
DWORD dwActiveProtocol;
int r = regexec(&compiled_name, p, 0, NULL, 0);
if (r == 0) {
LOGW(worker, "Attempting to open card/slot '%s'\n", p);
rc = SCardConnect(worker->reader.pcsc.hContext, p, bankd_share_mode(worker->bankd),
SCARD_PROTOCOL_T0, &worker->reader.pcsc.hCard,
&dwActiveProtocol);
if (rc == SCARD_S_SUCCESS)
result = 0;
else {
LOGW_PCSC_ERROR(worker, rc, "SCardConnect");
goto out_readerfree;
}
break;
}
p += strlen(p) + 1;
}
if (result < 0)
LOGW(worker, "Error: Cannot find PC/SC reader/slot matching using regex '%s'\n", worker->reader.name);
out_readerfree:
SCardFreeMemory(worker->reader.pcsc.hContext, mszReaders);
out_regfree:
regfree(&compiled_name);
return result;
}
static int pcsc_open_card(struct bankd_worker *worker)
{
long rc;
if (!worker->reader.pcsc.hContext) {
LOGW(worker, "Attempting to open PC/SC context\n");
/* The PC/SC context must be created inside the thread where we'll later use it */
rc = SCardEstablishContext(SCARD_SCOPE_SYSTEM, NULL, NULL, &worker->reader.pcsc.hContext);
PCSC_ERROR(worker, rc, "SCardEstablishContext")
}
if (!worker->reader.pcsc.hCard) {
rc = pcsc_connect_slot_regex(worker);
if (rc != 0)
goto end;
}
rc = pcsc_get_atr(worker);
end:
return rc;
}
static int pcsc_reset_card(struct bankd_worker *worker, bool cold_reset)
{
long rc;
DWORD dwActiveProtocol;
LOGW(worker, "Resetting card in '%s' (%s)\n", worker->reader.name,
cold_reset ? "cold reset" : "warm reset");
rc = SCardReconnect(worker->reader.pcsc.hCard, bankd_share_mode(worker->bankd), SCARD_PROTOCOL_T0,
cold_reset ? SCARD_UNPOWER_CARD : SCARD_RESET_CARD, &dwActiveProtocol);
PCSC_ERROR(worker, rc, "SCardReconnect");
rc = pcsc_get_atr(worker);
end:
return rc;
}
static int pcsc_transceive(struct bankd_worker *worker, const uint8_t *out, size_t out_len,
uint8_t *in, size_t *in_len)
{
const SCARD_IO_REQUEST *pioSendPci = SCARD_PCI_T0;
SCARD_IO_REQUEST pioRecvPci;
long rc;
rc = SCardTransmit(worker->reader.pcsc.hCard, pioSendPci, out, out_len, &pioRecvPci, in, in_len);
/* don't use PCSC_ERROR here as we don't want to log every successful SCardTransmit */
if (rc != SCARD_S_SUCCESS)
LOGW_PCSC_ERROR(worker, rc, "SCardTransmit");
return rc;
}
static void pcsc_cleanup(struct bankd_worker *worker)
{
if (worker->reader.pcsc.hCard) {
SCardDisconnect(worker->reader.pcsc.hCard, SCARD_UNPOWER_CARD);
worker->reader.pcsc.hCard = 0;
}
if (worker->reader.pcsc.hContext) {
SCardReleaseContext(worker->reader.pcsc.hContext);
worker->reader.pcsc.hContext = 0;
}
}
const struct bankd_driver_ops pcsc_driver_ops = {
.open_card = pcsc_open_card,
.reset_card = pcsc_reset_card,
.transceive = pcsc_transceive,
.cleanup = pcsc_cleanup,
};