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qemu/libcacard/vscclient.c

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/*
* Tester for VSCARD protocol, client side.
*
* Can be used with ccid-card-passthru.
*
* Copyright (c) 2011 Red Hat.
* Written by Alon Levy.
*
* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
* See the COPYING.LIB file in the top-level directory.
*/
#ifndef _WIN32
#include <netdb.h>
#endif
#include <glib.h>
#include "qemu-common.h"
#include "qemu/thread.h"
#include "qemu/sockets.h"
#include "vscard_common.h"
#include "vreader.h"
#include "vcard_emul.h"
#include "vevent.h"
static int verbose;
static void
print_byte_array(
uint8_t *arrBytes,
unsigned int nSize
) {
int i;
for (i = 0; i < nSize; i++) {
printf("%02X ", arrBytes[i]);
}
printf("\n");
}
static void
print_usage(void) {
printf("vscclient [-c <certname> .. -e <emul_args> -d <level>%s] "
"<host> <port>\n",
#ifdef USE_PASSTHRU
" -p");
printf(" -p use passthrough mode\n");
#else
"");
#endif
vcard_emul_usage();
}
static GIOChannel *channel_socket;
static GByteArray *socket_to_send;
static QemuMutex socket_to_send_lock;
static guint socket_tag;
static void
update_socket_watch(gboolean out);
static gboolean
do_socket_send(GIOChannel *source,
GIOCondition condition,
gpointer data)
{
gsize bw;
GError *err = NULL;
g_return_val_if_fail(socket_to_send->len != 0, FALSE);
g_return_val_if_fail(condition & G_IO_OUT, FALSE);
g_io_channel_write_chars(channel_socket,
(gchar *)socket_to_send->data, socket_to_send->len, &bw, &err);
if (err != NULL) {
g_error("Error while sending socket %s", err->message);
return FALSE;
}
g_byte_array_remove_range(socket_to_send, 0, bw);
if (socket_to_send->len == 0) {
update_socket_watch(FALSE);
return FALSE;
}
return TRUE;
}
static gboolean
socket_prepare_sending(gpointer user_data)
{
update_socket_watch(TRUE);
return FALSE;
}
static int
send_msg(
VSCMsgType type,
uint32_t reader_id,
const void *msg,
unsigned int length
) {
VSCMsgHeader mhHeader;
qemu_mutex_lock(&socket_to_send_lock);
if (verbose > 10) {
printf("sending type=%d id=%u, len =%u (0x%x)\n",
type, reader_id, length, length);
}
mhHeader.type = htonl(type);
mhHeader.reader_id = 0;
mhHeader.length = htonl(length);
g_byte_array_append(socket_to_send, (guint8 *)&mhHeader, sizeof(mhHeader));
g_byte_array_append(socket_to_send, (guint8 *)msg, length);
g_idle_add(socket_prepare_sending, NULL);
qemu_mutex_unlock(&socket_to_send_lock);
return 0;
}
static VReader *pending_reader;
static QemuMutex pending_reader_lock;
static QemuCond pending_reader_condition;
#define MAX_ATR_LEN 40
static void *
event_thread(void *arg)
{
unsigned char atr[MAX_ATR_LEN];
int atr_len = MAX_ATR_LEN;
VEvent *event = NULL;
unsigned int reader_id;
while (1) {
const char *reader_name;
event = vevent_wait_next_vevent();
if (event == NULL) {
break;
}
reader_id = vreader_get_id(event->reader);
if (reader_id == VSCARD_UNDEFINED_READER_ID &&
event->type != VEVENT_READER_INSERT) {
/* ignore events from readers qemu has rejected */
/* if qemu is still deciding on this reader, wait to see if need to
* forward this event */
qemu_mutex_lock(&pending_reader_lock);
if (!pending_reader || (pending_reader != event->reader)) {
/* wasn't for a pending reader, this reader has already been
* rejected by qemu */
qemu_mutex_unlock(&pending_reader_lock);
vevent_delete(event);
continue;
}
/* this reader hasn't been told its status from qemu yet, wait for
* that status */
while (pending_reader != NULL) {
qemu_cond_wait(&pending_reader_condition, &pending_reader_lock);
}
qemu_mutex_unlock(&pending_reader_lock);
/* now recheck the id */
reader_id = vreader_get_id(event->reader);
if (reader_id == VSCARD_UNDEFINED_READER_ID) {
/* this reader was rejected */
vevent_delete(event);
continue;
}
/* reader was accepted, now forward the event */
}
switch (event->type) {
case VEVENT_READER_INSERT:
/* tell qemu to insert a new CCID reader */
/* wait until qemu has responded to our first reader insert
* before we send a second. That way we won't confuse the responses
* */
qemu_mutex_lock(&pending_reader_lock);
while (pending_reader != NULL) {
qemu_cond_wait(&pending_reader_condition, &pending_reader_lock);
}
pending_reader = vreader_reference(event->reader);
qemu_mutex_unlock(&pending_reader_lock);
reader_name = vreader_get_name(event->reader);
if (verbose > 10) {
printf(" READER INSERT: %s\n", reader_name);
}
send_msg(VSC_ReaderAdd,
reader_id, /* currerntly VSCARD_UNDEFINED_READER_ID */
NULL, 0 /* TODO reader_name, strlen(reader_name) */);
break;
case VEVENT_READER_REMOVE:
/* future, tell qemu that an old CCID reader has been removed */
if (verbose > 10) {
printf(" READER REMOVE: %u\n", reader_id);
}
send_msg(VSC_ReaderRemove, reader_id, NULL, 0);
break;
case VEVENT_CARD_INSERT:
/* get the ATR (intended as a response to a power on from the
* reader */
atr_len = MAX_ATR_LEN;
vreader_power_on(event->reader, atr, &atr_len);
/* ATR call functions as a Card Insert event */
if (verbose > 10) {
printf(" CARD INSERT %u: ", reader_id);
print_byte_array(atr, atr_len);
}
send_msg(VSC_ATR, reader_id, atr, atr_len);
break;
case VEVENT_CARD_REMOVE:
/* Card removed */
if (verbose > 10) {
printf(" CARD REMOVE %u:\n", reader_id);
}
send_msg(VSC_CardRemove, reader_id, NULL, 0);
break;
default:
break;
}
vevent_delete(event);
}
return NULL;
}
static unsigned int
get_id_from_string(char *string, unsigned int default_id)
{
unsigned int id = atoi(string);
/* don't accidentally swith to zero because no numbers have been supplied */
if ((id == 0) && *string != '0') {
return default_id;
}
return id;
}
static int
on_host_init(VSCMsgHeader *mhHeader, VSCMsgInit *incoming)
{
uint32_t *capabilities = (incoming->capabilities);
int num_capabilities =
1 + ((mhHeader->length - sizeof(VSCMsgInit)) / sizeof(uint32_t));
int i;
QemuThread thread_id;
incoming->version = ntohl(incoming->version);
if (incoming->version != VSCARD_VERSION) {
if (verbose > 0) {
printf("warning: host has version %d, we have %d\n",
verbose, VSCARD_VERSION);
}
}
if (incoming->magic != VSCARD_MAGIC) {
printf("unexpected magic: got %d, expected %d\n",
incoming->magic, VSCARD_MAGIC);
return -1;
}
for (i = 0 ; i < num_capabilities; ++i) {
capabilities[i] = ntohl(capabilities[i]);
}
/* Future: check capabilities */
/* remove whatever reader might be left in qemu,
* in case of an unclean previous exit. */
send_msg(VSC_ReaderRemove, VSCARD_MINIMAL_READER_ID, NULL, 0);
/* launch the event_thread. This will trigger reader adds for all the
* existing readers */
qemu_thread_create(&thread_id, event_thread, NULL, 0);
return 0;
}
enum {
STATE_HEADER,
STATE_MESSAGE,
};
#define APDUBufSize 270
static gboolean
do_socket_read(GIOChannel *source,
GIOCondition condition,
gpointer data)
{
int rv;
int dwSendLength;
int dwRecvLength;
uint8_t pbRecvBuffer[APDUBufSize];
static uint8_t pbSendBuffer[APDUBufSize];
VReaderStatus reader_status;
VReader *reader = NULL;
static VSCMsgHeader mhHeader;
VSCMsgError *error_msg;
GError *err = NULL;
static gchar *buf;
static gsize br, to_read;
static int state = STATE_HEADER;
if (state == STATE_HEADER && to_read == 0) {
buf = (gchar *)&mhHeader;
to_read = sizeof(mhHeader);
}
if (to_read > 0) {
g_io_channel_read_chars(source, (gchar *)buf, to_read, &br, &err);
if (err != NULL) {
g_error("error while reading: %s", err->message);
}
buf += br;
to_read -= br;
if (to_read != 0) {
return TRUE;
}
}
if (state == STATE_HEADER) {
mhHeader.type = ntohl(mhHeader.type);
mhHeader.reader_id = ntohl(mhHeader.reader_id);
mhHeader.length = ntohl(mhHeader.length);
if (verbose) {
printf("Header: type=%d, reader_id=%u length=%d (0x%x)\n",
mhHeader.type, mhHeader.reader_id, mhHeader.length,
mhHeader.length);
}
switch (mhHeader.type) {
case VSC_APDU:
case VSC_Flush:
case VSC_Error:
case VSC_Init:
buf = (gchar *)pbSendBuffer;
to_read = mhHeader.length;
state = STATE_MESSAGE;
return TRUE;
default:
fprintf(stderr, "Unexpected message of type 0x%X\n", mhHeader.type);
return FALSE;
}
}
if (state == STATE_MESSAGE) {
switch (mhHeader.type) {
case VSC_APDU:
if (verbose) {
printf(" recv APDU: ");
print_byte_array(pbSendBuffer, mhHeader.length);
}
/* Transmit received APDU */
dwSendLength = mhHeader.length;
dwRecvLength = sizeof(pbRecvBuffer);
reader = vreader_get_reader_by_id(mhHeader.reader_id);
reader_status = vreader_xfr_bytes(reader,
pbSendBuffer, dwSendLength,
pbRecvBuffer, &dwRecvLength);
if (reader_status == VREADER_OK) {
mhHeader.length = dwRecvLength;
if (verbose) {
printf(" send response: ");
print_byte_array(pbRecvBuffer, mhHeader.length);
}
send_msg(VSC_APDU, mhHeader.reader_id,
pbRecvBuffer, dwRecvLength);
} else {
rv = reader_status; /* warning: not meaningful */
send_msg(VSC_Error, mhHeader.reader_id, &rv, sizeof(uint32_t));
}
vreader_free(reader);
reader = NULL; /* we've freed it, don't use it by accident
again */
break;
case VSC_Flush:
/* TODO: actually flush */
send_msg(VSC_FlushComplete, mhHeader.reader_id, NULL, 0);
break;
case VSC_Error:
error_msg = (VSCMsgError *) pbSendBuffer;
if (error_msg->code == VSC_SUCCESS) {
qemu_mutex_lock(&pending_reader_lock);
if (pending_reader) {
vreader_set_id(pending_reader, mhHeader.reader_id);
vreader_free(pending_reader);
pending_reader = NULL;
qemu_cond_signal(&pending_reader_condition);
}
qemu_mutex_unlock(&pending_reader_lock);
break;
}
printf("warning: qemu refused to add reader\n");
if (error_msg->code == VSC_CANNOT_ADD_MORE_READERS) {
/* clear pending reader, qemu can't handle any more */
qemu_mutex_lock(&pending_reader_lock);
if (pending_reader) {
pending_reader = NULL;
/* make sure the event loop doesn't hang */
qemu_cond_signal(&pending_reader_condition);
}
qemu_mutex_unlock(&pending_reader_lock);
}
break;
case VSC_Init:
if (on_host_init(&mhHeader, (VSCMsgInit *)pbSendBuffer) < 0) {
return FALSE;
}
break;
default:
g_warn_if_reached();
return FALSE;
}
state = STATE_HEADER;
}
return TRUE;
}
static gboolean
do_socket(GIOChannel *source,
GIOCondition condition,
gpointer data)
{
/* not sure if two watches work well with a single win32 sources */
if (condition & G_IO_OUT) {
if (!do_socket_send(source, condition, data)) {
return FALSE;
}
}
if (condition & G_IO_IN) {
if (!do_socket_read(source, condition, data)) {
return FALSE;
}
}
return TRUE;
}
static void
update_socket_watch(gboolean out)
{
if (socket_tag != 0) {
g_source_remove(socket_tag);
}
socket_tag = g_io_add_watch(channel_socket,
G_IO_IN | (out ? G_IO_OUT : 0), do_socket, NULL);
}
static gboolean
do_command(GIOChannel *source,
GIOCondition condition,
gpointer data)
{
char *string;
VCardEmulError error;
static unsigned int default_reader_id;
unsigned int reader_id;
VReader *reader = NULL;
GError *err = NULL;
g_assert(condition & G_IO_IN);
reader_id = default_reader_id;
g_io_channel_read_line(source, &string, NULL, NULL, &err);
if (err != NULL) {
g_error("Error while reading command: %s", err->message);
}
if (string != NULL) {
if (strncmp(string, "exit", 4) == 0) {
/* remove all the readers */
VReaderList *list = vreader_get_reader_list();
VReaderListEntry *reader_entry;
printf("Active Readers:\n");
for (reader_entry = vreader_list_get_first(list); reader_entry;
reader_entry = vreader_list_get_next(reader_entry)) {
VReader *reader = vreader_list_get_reader(reader_entry);
vreader_id_t reader_id;
reader_id = vreader_get_id(reader);
if (reader_id == -1) {
continue;
}
/* be nice and signal card removal first (qemu probably should
* do this itself) */
if (vreader_card_is_present(reader) == VREADER_OK) {
send_msg(VSC_CardRemove, reader_id, NULL, 0);
}
send_msg(VSC_ReaderRemove, reader_id, NULL, 0);
}
exit(0);
} else if (strncmp(string, "insert", 6) == 0) {
if (string[6] == ' ') {
reader_id = get_id_from_string(&string[7], reader_id);
}
reader = vreader_get_reader_by_id(reader_id);
if (reader != NULL) {
error = vcard_emul_force_card_insert(reader);
printf("insert %s, returned %d\n",
reader ? vreader_get_name(reader)
: "invalid reader", error);
} else {
printf("no reader by id %u found\n", reader_id);
}
} else if (strncmp(string, "remove", 6) == 0) {
if (string[6] == ' ') {
reader_id = get_id_from_string(&string[7], reader_id);
}
reader = vreader_get_reader_by_id(reader_id);
if (reader != NULL) {
error = vcard_emul_force_card_remove(reader);
printf("remove %s, returned %d\n",
reader ? vreader_get_name(reader)
: "invalid reader", error);
} else {
printf("no reader by id %u found\n", reader_id);
}
} else if (strncmp(string, "select", 6) == 0) {
if (string[6] == ' ') {
reader_id = get_id_from_string(&string[7],
VSCARD_UNDEFINED_READER_ID);
}
if (reader_id != VSCARD_UNDEFINED_READER_ID) {
reader = vreader_get_reader_by_id(reader_id);
}
if (reader) {
printf("Selecting reader %u, %s\n", reader_id,
vreader_get_name(reader));
default_reader_id = reader_id;
} else {
printf("Reader with id %u not found\n", reader_id);
}
} else if (strncmp(string, "debug", 5) == 0) {
if (string[5] == ' ') {
verbose = get_id_from_string(&string[6], 0);
}
printf("debug level = %d\n", verbose);
} else if (strncmp(string, "list", 4) == 0) {
VReaderList *list = vreader_get_reader_list();
VReaderListEntry *reader_entry;
printf("Active Readers:\n");
for (reader_entry = vreader_list_get_first(list); reader_entry;
reader_entry = vreader_list_get_next(reader_entry)) {
VReader *reader = vreader_list_get_reader(reader_entry);
vreader_id_t reader_id;
reader_id = vreader_get_id(reader);
if (reader_id == -1) {
continue;
}
printf("%3u %s %s\n", reader_id,
vreader_card_is_present(reader) == VREADER_OK ?
"CARD_PRESENT" : " ",
vreader_get_name(reader));
}
printf("Inactive Readers:\n");
for (reader_entry = vreader_list_get_first(list); reader_entry;
reader_entry = vreader_list_get_next(reader_entry)) {
VReader *reader = vreader_list_get_reader(reader_entry);
vreader_id_t reader_id;
reader_id = vreader_get_id(reader);
if (reader_id != -1) {
continue;
}
printf("INA %s %s\n",
vreader_card_is_present(reader) == VREADER_OK ?
"CARD_PRESENT" : " ",
vreader_get_name(reader));
}
} else if (*string != 0) {
printf("valid commands:\n");
printf("insert [reader_id]\n");
printf("remove [reader_id]\n");
printf("select reader_id\n");
printf("list\n");
printf("debug [level]\n");
printf("exit\n");
}
}
vreader_free(reader);
printf("> ");
fflush(stdout);
return TRUE;
}
/* just for ease of parsing command line arguments. */
#define MAX_CERTS 100
static int
connect_to_qemu(
const char *host,
const char *port
) {
struct addrinfo hints;
struct addrinfo *server;
int ret, sock;
sock = qemu_socket(AF_INET, SOCK_STREAM, 0);
if (sock < 0) {
/* Error */
fprintf(stderr, "Error opening socket!\n");
return -1;
}
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = 0;
hints.ai_protocol = 0; /* Any protocol */
ret = getaddrinfo(host, port, &hints, &server);
if (ret != 0) {
/* Error */
fprintf(stderr, "getaddrinfo failed\n");
return -1;
}
if (connect(sock, server->ai_addr, server->ai_addrlen) < 0) {
/* Error */
fprintf(stderr, "Could not connect\n");
return -1;
}
if (verbose) {
printf("Connected (sizeof Header=%zd)!\n", sizeof(VSCMsgHeader));
}
return sock;
}
int
main(
int argc,
char *argv[]
) {
GMainLoop *loop;
GIOChannel *channel_stdin;
char *qemu_host;
char *qemu_port;
VSCMsgHeader mhHeader;
VCardEmulOptions *command_line_options = NULL;
char *cert_names[MAX_CERTS];
char *emul_args = NULL;
int cert_count = 0;
int c, sock;
if (socket_init() != 0)
return 1;
while ((c = getopt(argc, argv, "c:e:pd:")) != -1) {
switch (c) {
case 'c':
if (cert_count >= MAX_CERTS) {
printf("too many certificates (max = %d)\n", MAX_CERTS);
exit(5);
}
cert_names[cert_count++] = optarg;
break;
case 'e':
emul_args = optarg;
break;
case 'p':
print_usage();
exit(4);
break;
case 'd':
verbose = get_id_from_string(optarg, 1);
break;
}
}
if (argc - optind != 2) {
print_usage();
exit(4);
}
if (cert_count > 0) {
char *new_args;
int len, i;
/* if we've given some -c options, we clearly we want do so some
* software emulation. add that emulation now. this is NSS Emulator
* specific */
if (emul_args == NULL) {
emul_args = (char *)"db=\"/etc/pki/nssdb\"";
}
#define SOFT_STRING ",soft=(,Virtual Reader,CAC,,"
/* 2 == close paren & null */
len = strlen(emul_args) + strlen(SOFT_STRING) + 2;
for (i = 0; i < cert_count; i++) {
len += strlen(cert_names[i])+1; /* 1 == comma */
}
new_args = g_malloc(len);
strcpy(new_args, emul_args);
strcat(new_args, SOFT_STRING);
for (i = 0; i < cert_count; i++) {
strcat(new_args, cert_names[i]);
strcat(new_args, ",");
}
strcat(new_args, ")");
emul_args = new_args;
}
if (emul_args) {
command_line_options = vcard_emul_options(emul_args);
}
qemu_host = g_strdup(argv[argc - 2]);
qemu_port = g_strdup(argv[argc - 1]);
sock = connect_to_qemu(qemu_host, qemu_port);
if (sock == -1) {
fprintf(stderr, "error opening socket, exiting.\n");
exit(5);
}
socket_to_send = g_byte_array_new();
qemu_mutex_init(&socket_to_send_lock);
qemu_mutex_init(&pending_reader_lock);
qemu_cond_init(&pending_reader_condition);
vcard_emul_init(command_line_options);
loop = g_main_loop_new(NULL, true);
printf("> ");
fflush(stdout);
#ifdef _WIN32
channel_stdin = g_io_channel_win32_new_fd(STDIN_FILENO);
#else
channel_stdin = g_io_channel_unix_new(STDIN_FILENO);
#endif
g_io_add_watch(channel_stdin, G_IO_IN, do_command, NULL);
#ifdef _WIN32
channel_socket = g_io_channel_win32_new_socket(sock);
#else
channel_socket = g_io_channel_unix_new(sock);
#endif
g_io_channel_set_encoding(channel_socket, NULL, NULL);
/* we buffer ourself for thread safety reasons */
g_io_channel_set_buffered(channel_socket, FALSE);
/* Send init message, Host responds (and then we send reader attachments) */
VSCMsgInit init = {
.version = htonl(VSCARD_VERSION),
.magic = VSCARD_MAGIC,
.capabilities = {0}
};
send_msg(VSC_Init, mhHeader.reader_id, &init, sizeof(init));
g_main_loop_run(loop);
g_main_loop_unref(loop);
g_io_channel_unref(channel_stdin);
g_io_channel_unref(channel_socket);
g_byte_array_unref(socket_to_send);
return 0;
}
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