373 lines
8.1 KiB
C
373 lines
8.1 KiB
C
/*
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* Copyright (c) 2001 Markus Friedl. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef SMARTCARD
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#include "includes.h"
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RCSID("$OpenBSD: scard.c,v 1.13 2001/08/02 16:14:05 jakob Exp $");
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#include <openssl/engine.h>
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#include <sectok.h>
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#include "key.h"
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#include "log.h"
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#include "xmalloc.h"
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#include "scard.h"
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#define CLA_SSH 0x05
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#define INS_DECRYPT 0x10
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#define INS_GET_KEYLENGTH 0x20
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#define INS_GET_PUBKEY 0x30
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#define INS_GET_RESPONSE 0xc0
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#define MAX_BUF_SIZE 256
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static int sc_fd = -1;
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static char *sc_reader_id = NULL;
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static int cla = 0x00; /* class */
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/* interface to libsectok */
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static int
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sc_open(void)
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{
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int sw;
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if (sc_fd >= 0)
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return sc_fd;
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sc_fd = sectok_friendly_open(sc_reader_id, STONOWAIT, &sw);
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if (sc_fd < 0) {
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error("sectok_open failed: %s", sectok_get_sw(sw));
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return SCARD_ERROR_FAIL;
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}
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if (! sectok_cardpresent(sc_fd)) {
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debug("smartcard in reader %s not present, skipping",
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sc_reader_id);
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sc_close();
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return SCARD_ERROR_NOCARD;
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}
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if (sectok_reset(sc_fd, 0, NULL, &sw) <= 0) {
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error("sectok_reset failed: %s", sectok_get_sw(sw));
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sc_fd = -1;
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return SCARD_ERROR_FAIL;
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}
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if ((cla = cyberflex_inq_class(sc_fd)) < 0)
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cla = 0;
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debug("sc_open ok %d", sc_fd);
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return sc_fd;
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}
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static int
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sc_enable_applet(void)
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{
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static u_char aid[] = {0xfc, 0x53, 0x73, 0x68, 0x2e, 0x62, 0x69, 0x6e};
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int sw = 0;
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/* select applet id */
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sectok_apdu(sc_fd, cla, 0xa4, 0x04, 0, sizeof aid, aid, 0, NULL, &sw);
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if (!sectok_swOK(sw)) {
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error("sectok_apdu failed: %s", sectok_get_sw(sw));
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sc_close();
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return -1;
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}
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return 0;
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}
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static int
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sc_init(void)
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{
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int status;
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status = sc_open();
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if (status == SCARD_ERROR_NOCARD) {
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return SCARD_ERROR_NOCARD;
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}
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if (status < 0 ) {
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error("sc_open failed");
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return status;
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}
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if (sc_enable_applet() < 0) {
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error("sc_enable_applet failed");
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return SCARD_ERROR_APPLET;
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}
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return 0;
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}
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static int
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sc_read_pubkey(Key * k)
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{
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u_char buf[2], *n;
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char *p;
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int len, sw, status;
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len = sw = 0;
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if (sc_fd < 0) {
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status = sc_init();
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if (status < 0 )
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return status;
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}
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/* get key size */
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sectok_apdu(sc_fd, CLA_SSH, INS_GET_KEYLENGTH, 0, 0, 0, NULL,
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sizeof(buf), buf, &sw);
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if (!sectok_swOK(sw)) {
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error("could not obtain key length: %s", sectok_get_sw(sw));
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sc_close();
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return -1;
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}
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len = (buf[0] << 8) | buf[1];
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len /= 8;
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debug("INS_GET_KEYLENGTH: len %d sw %s", len, sectok_get_sw(sw));
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n = xmalloc(len);
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/* get n */
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sectok_apdu(sc_fd, CLA_SSH, INS_GET_PUBKEY, 0, 0, 0, NULL, len, n, &sw);
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if (!sectok_swOK(sw)) {
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error("could not obtain public key: %s", sectok_get_sw(sw));
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xfree(n);
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return -1;
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}
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debug("INS_GET_KEYLENGTH: sw %s", sectok_get_sw(sw));
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if (BN_bin2bn(n, len, k->rsa->n) == NULL) {
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error("c_read_pubkey: BN_bin2bn failed");
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xfree(n);
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sc_close();
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return -1;
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}
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xfree(n);
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/* currently the java applet just stores 'n' */
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if (!BN_set_word(k->rsa->e, 35)) {
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error("c_read_pubkey: BN_set_word(e, 35) failed");
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return -1;
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}
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p = key_fingerprint(k, SSH_FP_MD5, SSH_FP_HEX);
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debug("fingerprint %d %s", key_size(k), p);
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xfree(p);
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return 0;
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}
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/* private key operations */
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static int
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sc_private_decrypt(int flen, u_char *from, u_char *to, RSA *rsa, int padding)
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{
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u_char *padded = NULL;
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int sw, len, olen, status;
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debug("sc_private_decrypt called");
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olen = len = sw = 0;
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if (sc_fd < 0) {
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status = sc_init();
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if (status < 0 )
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goto err;
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}
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if (padding != RSA_PKCS1_PADDING)
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goto err;
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len = BN_num_bytes(rsa->n);
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padded = xmalloc(len);
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sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, from, 0, NULL, &sw);
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if (!sectok_swOK(sw)) {
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error("sc_private_decrypt: INS_DECRYPT failed: %s",
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sectok_get_sw(sw));
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sc_close();
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goto err;
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}
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sectok_apdu(sc_fd, CLA_SSH, INS_GET_RESPONSE, 0, 0, 0, NULL,
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len, padded, &sw);
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if (!sectok_swOK(sw)) {
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error("sc_private_decrypt: INS_GET_RESPONSE failed: %s",
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sectok_get_sw(sw));
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sc_close();
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goto err;
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}
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olen = RSA_padding_check_PKCS1_type_2(to, len, padded + 1, len - 1,
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len);
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err:
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if (padded)
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xfree(padded);
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return (olen >= 0 ? olen : status);
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}
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static int
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sc_private_encrypt(int flen, u_char *from, u_char *to, RSA *rsa, int padding)
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{
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u_char *padded = NULL;
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int sw, len, status;
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len = sw = 0;
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if (sc_fd < 0) {
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status = sc_init();
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if (status < 0 )
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goto err;
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}
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if (padding != RSA_PKCS1_PADDING)
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goto err;
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debug("sc_private_encrypt called");
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len = BN_num_bytes(rsa->n);
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padded = xmalloc(len);
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if (RSA_padding_add_PKCS1_type_1(padded, len, from, flen) <= 0) {
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error("RSA_padding_add_PKCS1_type_1 failed");
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goto err;
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}
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sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, padded, 0, NULL, &sw);
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if (!sectok_swOK(sw)) {
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error("sc_private_decrypt: INS_DECRYPT failed: %s",
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sectok_get_sw(sw));
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sc_close();
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goto err;
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}
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sectok_apdu(sc_fd, CLA_SSH, INS_GET_RESPONSE, 0, 0, 0, NULL,
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len, to, &sw);
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if (!sectok_swOK(sw)) {
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error("sc_private_decrypt: INS_GET_RESPONSE failed: %s",
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sectok_get_sw(sw));
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sc_close();
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goto err;
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}
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err:
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if (padded)
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xfree(padded);
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return (len >= 0 ? len : status);
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}
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/* called on free */
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static int (*orig_finish)(RSA *rsa) = NULL;
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static int
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sc_finish(RSA *rsa)
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{
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if (orig_finish)
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orig_finish(rsa);
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sc_close();
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return 1;
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}
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/* engine for overloading private key operations */
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static ENGINE *smart_engine = NULL;
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static RSA_METHOD smart_rsa =
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{
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"sectok",
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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0,
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NULL,
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};
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ENGINE *
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sc_get_engine(void)
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{
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RSA_METHOD *def;
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def = RSA_get_default_openssl_method();
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/* overload */
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smart_rsa.rsa_priv_enc = sc_private_encrypt;
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smart_rsa.rsa_priv_dec = sc_private_decrypt;
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/* save original */
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orig_finish = def->finish;
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smart_rsa.finish = sc_finish;
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/* just use the OpenSSL version */
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smart_rsa.rsa_pub_enc = def->rsa_pub_enc;
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smart_rsa.rsa_pub_dec = def->rsa_pub_dec;
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smart_rsa.rsa_mod_exp = def->rsa_mod_exp;
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smart_rsa.bn_mod_exp = def->bn_mod_exp;
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smart_rsa.init = def->init;
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smart_rsa.flags = def->flags;
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smart_rsa.app_data = def->app_data;
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smart_rsa.rsa_sign = def->rsa_sign;
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smart_rsa.rsa_verify = def->rsa_verify;
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smart_engine = ENGINE_new();
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ENGINE_set_id(smart_engine, "sectok");
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ENGINE_set_name(smart_engine, "libsectok");
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ENGINE_set_RSA(smart_engine, &smart_rsa);
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ENGINE_set_DSA(smart_engine, DSA_get_default_openssl_method());
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ENGINE_set_DH(smart_engine, DH_get_default_openssl_method());
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ENGINE_set_RAND(smart_engine, RAND_SSLeay());
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ENGINE_set_BN_mod_exp(smart_engine, BN_mod_exp);
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return smart_engine;
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}
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void
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sc_close(void)
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{
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if (sc_fd >= 0) {
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sectok_close(sc_fd);
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sc_fd = -1;
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}
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}
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Key *
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sc_get_key(const char *id)
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{
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Key *k;
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int status;
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if (sc_reader_id != NULL)
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xfree(sc_reader_id);
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sc_reader_id = xstrdup(id);
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k = key_new(KEY_RSA);
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if (k == NULL) {
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return NULL;
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}
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status = sc_read_pubkey(k);
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if (status == SCARD_ERROR_NOCARD) {
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key_free(k);
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return NULL;
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}
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if (status < 0 ) {
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error("sc_read_pubkey failed");
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key_free(k);
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return NULL;
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}
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return k;
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sc_close();
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}
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#endif /* SMARTCARD */
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