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-rw-r--r--scard.c571
1 files changed, 571 insertions, 0 deletions
diff --git a/scard.c b/scard.c
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+++ b/scard.c
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+/* $OpenBSD: scard.c,v 1.36 2006/11/06 21:25:28 markus Exp $ */
+/*
+ * Copyright (c) 2001 Markus Friedl. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "includes.h"
+#if defined(SMARTCARD) && defined(USE_SECTOK)
+
+#include <sys/types.h>
+
+#include <sectok.h>
+#include <stdarg.h>
+#include <string.h>
+
+#include <openssl/evp.h>
+
+#include "xmalloc.h"
+#include "key.h"
+#include "log.h"
+#include "misc.h"
+#include "scard.h"
+
+#if OPENSSL_VERSION_NUMBER < 0x00907000L
+#define USE_ENGINE
+#define RSA_get_default_method RSA_get_default_openssl_method
+#else
+#endif
+
+#ifdef USE_ENGINE
+#include <openssl/engine.h>
+#define sc_get_rsa sc_get_engine
+#else
+#define sc_get_rsa sc_get_rsa_method
+#endif
+
+#define CLA_SSH 0x05
+#define INS_DECRYPT 0x10
+#define INS_GET_KEYLENGTH 0x20
+#define INS_GET_PUBKEY 0x30
+#define INS_GET_RESPONSE 0xc0
+
+#define MAX_BUF_SIZE 256
+
+u_char DEFAUT0[] = {0xad, 0x9f, 0x61, 0xfe, 0xfa, 0x20, 0xce, 0x63};
+
+static int sc_fd = -1;
+static char *sc_reader_id = NULL;
+static char *sc_pin = NULL;
+static int cla = 0x00; /* class */
+
+static void sc_mk_digest(const char *pin, u_char *digest);
+static int get_AUT0(u_char *aut0);
+static int try_AUT0(void);
+
+/* interface to libsectok */
+
+static int
+sc_open(void)
+{
+ int sw;
+
+ if (sc_fd >= 0)
+ return sc_fd;
+
+ sc_fd = sectok_friendly_open(sc_reader_id, STONOWAIT, &sw);
+ if (sc_fd < 0) {
+ error("sectok_open failed: %s", sectok_get_sw(sw));
+ return SCARD_ERROR_FAIL;
+ }
+ if (! sectok_cardpresent(sc_fd)) {
+ debug("smartcard in reader %s not present, skipping",
+ sc_reader_id);
+ sc_close();
+ return SCARD_ERROR_NOCARD;
+ }
+ if (sectok_reset(sc_fd, 0, NULL, &sw) <= 0) {
+ error("sectok_reset failed: %s", sectok_get_sw(sw));
+ sc_fd = -1;
+ return SCARD_ERROR_FAIL;
+ }
+ if ((cla = cyberflex_inq_class(sc_fd)) < 0)
+ cla = 0;
+
+ debug("sc_open ok %d", sc_fd);
+ return sc_fd;
+}
+
+static int
+sc_enable_applet(void)
+{
+ static u_char aid[] = {0xfc, 0x53, 0x73, 0x68, 0x2e, 0x62, 0x69, 0x6e};
+ int sw = 0;
+
+ /* select applet id */
+ sectok_apdu(sc_fd, cla, 0xa4, 0x04, 0, sizeof aid, aid, 0, NULL, &sw);
+ if (!sectok_swOK(sw)) {
+ error("sectok_apdu failed: %s", sectok_get_sw(sw));
+ sc_close();
+ return -1;
+ }
+ return 0;
+}
+
+static int
+sc_init(void)
+{
+ int status;
+
+ status = sc_open();
+ if (status == SCARD_ERROR_NOCARD) {
+ return SCARD_ERROR_NOCARD;
+ }
+ if (status < 0) {
+ error("sc_open failed");
+ return status;
+ }
+ if (sc_enable_applet() < 0) {
+ error("sc_enable_applet failed");
+ return SCARD_ERROR_APPLET;
+ }
+ return 0;
+}
+
+static int
+sc_read_pubkey(Key * k)
+{
+ u_char buf[2], *n;
+ char *p;
+ int len, sw, status = -1;
+
+ len = sw = 0;
+ n = NULL;
+
+ if (sc_fd < 0) {
+ if (sc_init() < 0)
+ goto err;
+ }
+
+ /* get key size */
+ sectok_apdu(sc_fd, CLA_SSH, INS_GET_KEYLENGTH, 0, 0, 0, NULL,
+ sizeof(buf), buf, &sw);
+ if (!sectok_swOK(sw)) {
+ error("could not obtain key length: %s", sectok_get_sw(sw));
+ goto err;
+ }
+ len = (buf[0] << 8) | buf[1];
+ len /= 8;
+ debug("INS_GET_KEYLENGTH: len %d sw %s", len, sectok_get_sw(sw));
+
+ n = xmalloc(len);
+ /* get n */
+ sectok_apdu(sc_fd, CLA_SSH, INS_GET_PUBKEY, 0, 0, 0, NULL, len, n, &sw);
+
+ if (sw == 0x6982) {
+ if (try_AUT0() < 0)
+ goto err;
+ sectok_apdu(sc_fd, CLA_SSH, INS_GET_PUBKEY, 0, 0, 0, NULL, len, n, &sw);
+ }
+ if (!sectok_swOK(sw)) {
+ error("could not obtain public key: %s", sectok_get_sw(sw));
+ goto err;
+ }
+
+ debug("INS_GET_KEYLENGTH: sw %s", sectok_get_sw(sw));
+
+ if (BN_bin2bn(n, len, k->rsa->n) == NULL) {
+ error("c_read_pubkey: BN_bin2bn failed");
+ goto err;
+ }
+
+ /* currently the java applet just stores 'n' */
+ if (!BN_set_word(k->rsa->e, 35)) {
+ error("c_read_pubkey: BN_set_word(e, 35) failed");
+ goto err;
+ }
+
+ status = 0;
+ p = key_fingerprint(k, SSH_FP_MD5, SSH_FP_HEX);
+ debug("fingerprint %u %s", key_size(k), p);
+ xfree(p);
+
+err:
+ if (n != NULL)
+ xfree(n);
+ sc_close();
+ return status;
+}
+
+/* private key operations */
+
+static int
+sc_private_decrypt(int flen, u_char *from, u_char *to, RSA *rsa,
+ int padding)
+{
+ u_char *padded = NULL;
+ int sw, len, olen, status = -1;
+
+ debug("sc_private_decrypt called");
+
+ olen = len = sw = 0;
+ if (sc_fd < 0) {
+ status = sc_init();
+ if (status < 0)
+ goto err;
+ }
+ if (padding != RSA_PKCS1_PADDING)
+ goto err;
+
+ len = BN_num_bytes(rsa->n);
+ padded = xmalloc(len);
+
+ sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, from, len, padded, &sw);
+
+ if (sw == 0x6982) {
+ if (try_AUT0() < 0)
+ goto err;
+ sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, from, len, padded, &sw);
+ }
+ if (!sectok_swOK(sw)) {
+ error("sc_private_decrypt: INS_DECRYPT failed: %s",
+ sectok_get_sw(sw));
+ goto err;
+ }
+ olen = RSA_padding_check_PKCS1_type_2(to, len, padded + 1, len - 1,
+ len);
+err:
+ if (padded)
+ xfree(padded);
+ sc_close();
+ return (olen >= 0 ? olen : status);
+}
+
+static int
+sc_private_encrypt(int flen, u_char *from, u_char *to, RSA *rsa,
+ int padding)
+{
+ u_char *padded = NULL;
+ int sw, len, status = -1;
+
+ len = sw = 0;
+ if (sc_fd < 0) {
+ status = sc_init();
+ if (status < 0)
+ goto err;
+ }
+ if (padding != RSA_PKCS1_PADDING)
+ goto err;
+
+ debug("sc_private_encrypt called");
+ len = BN_num_bytes(rsa->n);
+ padded = xmalloc(len);
+
+ if (RSA_padding_add_PKCS1_type_1(padded, len, (u_char *)from, flen) <= 0) {
+ error("RSA_padding_add_PKCS1_type_1 failed");
+ goto err;
+ }
+ sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, padded, len, to, &sw);
+ if (sw == 0x6982) {
+ if (try_AUT0() < 0)
+ goto err;
+ sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, padded, len, to, &sw);
+ }
+ if (!sectok_swOK(sw)) {
+ error("sc_private_encrypt: INS_DECRYPT failed: %s",
+ sectok_get_sw(sw));
+ goto err;
+ }
+err:
+ if (padded)
+ xfree(padded);
+ sc_close();
+ return (len >= 0 ? len : status);
+}
+
+/* called on free */
+
+static int (*orig_finish)(RSA *rsa) = NULL;
+
+static int
+sc_finish(RSA *rsa)
+{
+ if (orig_finish)
+ orig_finish(rsa);
+ sc_close();
+ return 1;
+}
+
+/* engine for overloading private key operations */
+
+static RSA_METHOD *
+sc_get_rsa_method(void)
+{
+ static RSA_METHOD smart_rsa;
+ const RSA_METHOD *def = RSA_get_default_method();
+
+ /* use the OpenSSL version */
+ memcpy(&smart_rsa, def, sizeof(smart_rsa));
+
+ smart_rsa.name = "sectok";
+
+ /* overload */
+ smart_rsa.rsa_priv_enc = sc_private_encrypt;
+ smart_rsa.rsa_priv_dec = sc_private_decrypt;
+
+ /* save original */
+ orig_finish = def->finish;
+ smart_rsa.finish = sc_finish;
+
+ return &smart_rsa;
+}
+
+#ifdef USE_ENGINE
+static ENGINE *
+sc_get_engine(void)
+{
+ static ENGINE *smart_engine = NULL;
+
+ if ((smart_engine = ENGINE_new()) == NULL)
+ fatal("ENGINE_new failed");
+
+ ENGINE_set_id(smart_engine, "sectok");
+ ENGINE_set_name(smart_engine, "libsectok");
+
+ ENGINE_set_RSA(smart_engine, sc_get_rsa_method());
+ ENGINE_set_DSA(smart_engine, DSA_get_default_openssl_method());
+ ENGINE_set_DH(smart_engine, DH_get_default_openssl_method());
+ ENGINE_set_RAND(smart_engine, RAND_SSLeay());
+ ENGINE_set_BN_mod_exp(smart_engine, BN_mod_exp);
+
+ return smart_engine;
+}
+#endif
+
+void
+sc_close(void)
+{
+ if (sc_fd >= 0) {
+ sectok_close(sc_fd);
+ sc_fd = -1;
+ }
+}
+
+Key **
+sc_get_keys(const char *id, const char *pin)
+{
+ Key *k, *n, **keys;
+ int status, nkeys = 2;
+
+ if (sc_reader_id != NULL)
+ xfree(sc_reader_id);
+ sc_reader_id = xstrdup(id);
+
+ if (sc_pin != NULL)
+ xfree(sc_pin);
+ sc_pin = (pin == NULL) ? NULL : xstrdup(pin);
+
+ k = key_new(KEY_RSA);
+ if (k == NULL) {
+ return NULL;
+ }
+ status = sc_read_pubkey(k);
+ if (status == SCARD_ERROR_NOCARD) {
+ key_free(k);
+ return NULL;
+ }
+ if (status < 0) {
+ error("sc_read_pubkey failed");
+ key_free(k);
+ return NULL;
+ }
+ keys = xcalloc((nkeys+1), sizeof(Key *));
+
+ n = key_new(KEY_RSA1);
+ if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) ||
+ (BN_copy(n->rsa->e, k->rsa->e) == NULL))
+ fatal("sc_get_keys: BN_copy failed");
+ RSA_set_method(n->rsa, sc_get_rsa());
+ n->flags |= KEY_FLAG_EXT;
+ keys[0] = n;
+
+ n = key_new(KEY_RSA);
+ if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) ||
+ (BN_copy(n->rsa->e, k->rsa->e) == NULL))
+ fatal("sc_get_keys: BN_copy failed");
+ RSA_set_method(n->rsa, sc_get_rsa());
+ n->flags |= KEY_FLAG_EXT;
+ keys[1] = n;
+
+ keys[2] = NULL;
+
+ key_free(k);
+ return keys;
+}
+
+#define NUM_RSA_KEY_ELEMENTS 5+1
+#define COPY_RSA_KEY(x, i) \
+ do { \
+ len = BN_num_bytes(prv->rsa->x); \
+ elements[i] = xmalloc(len); \
+ debug("#bytes %d", len); \
+ if (BN_bn2bin(prv->rsa->x, elements[i]) < 0) \
+ goto done; \
+ } while (0)
+
+static void
+sc_mk_digest(const char *pin, u_char *digest)
+{
+ const EVP_MD *evp_md = EVP_sha1();
+ EVP_MD_CTX md;
+
+ EVP_DigestInit(&md, evp_md);
+ EVP_DigestUpdate(&md, pin, strlen(pin));
+ EVP_DigestFinal(&md, digest, NULL);
+}
+
+static int
+get_AUT0(u_char *aut0)
+{
+ char *pass;
+
+ pass = read_passphrase("Enter passphrase for smartcard: ", RP_ALLOW_STDIN);
+ if (pass == NULL)
+ return -1;
+ if (!strcmp(pass, "-")) {
+ memcpy(aut0, DEFAUT0, sizeof DEFAUT0);
+ return 0;
+ }
+ sc_mk_digest(pass, aut0);
+ memset(pass, 0, strlen(pass));
+ xfree(pass);
+ return 0;
+}
+
+static int
+try_AUT0(void)
+{
+ u_char aut0[EVP_MAX_MD_SIZE];
+
+ /* permission denied; try PIN if provided */
+ if (sc_pin && strlen(sc_pin) > 0) {
+ sc_mk_digest(sc_pin, aut0);
+ if (cyberflex_verify_AUT0(sc_fd, cla, aut0, 8) < 0) {
+ error("smartcard passphrase incorrect");
+ return (-1);
+ }
+ } else {
+ /* try default AUT0 key */
+ if (cyberflex_verify_AUT0(sc_fd, cla, DEFAUT0, 8) < 0) {
+ /* default AUT0 key failed; prompt for passphrase */
+ if (get_AUT0(aut0) < 0 ||
+ cyberflex_verify_AUT0(sc_fd, cla, aut0, 8) < 0) {
+ error("smartcard passphrase incorrect");
+ return (-1);
+ }
+ }
+ }
+ return (0);
+}
+
+int
+sc_put_key(Key *prv, const char *id)
+{
+ u_char *elements[NUM_RSA_KEY_ELEMENTS];
+ u_char key_fid[2];
+ u_char AUT0[EVP_MAX_MD_SIZE];
+ int len, status = -1, i, fd = -1, ret;
+ int sw = 0, cla = 0x00;
+
+ for (i = 0; i < NUM_RSA_KEY_ELEMENTS; i++)
+ elements[i] = NULL;
+
+ COPY_RSA_KEY(q, 0);
+ COPY_RSA_KEY(p, 1);
+ COPY_RSA_KEY(iqmp, 2);
+ COPY_RSA_KEY(dmq1, 3);
+ COPY_RSA_KEY(dmp1, 4);
+ COPY_RSA_KEY(n, 5);
+ len = BN_num_bytes(prv->rsa->n);
+ fd = sectok_friendly_open(id, STONOWAIT, &sw);
+ if (fd < 0) {
+ error("sectok_open failed: %s", sectok_get_sw(sw));
+ goto done;
+ }
+ if (! sectok_cardpresent(fd)) {
+ error("smartcard in reader %s not present", id);
+ goto done;
+ }
+ ret = sectok_reset(fd, 0, NULL, &sw);
+ if (ret <= 0) {
+ error("sectok_reset failed: %s", sectok_get_sw(sw));
+ goto done;
+ }
+ if ((cla = cyberflex_inq_class(fd)) < 0) {
+ error("cyberflex_inq_class failed");
+ goto done;
+ }
+ memcpy(AUT0, DEFAUT0, sizeof(DEFAUT0));
+ if (cyberflex_verify_AUT0(fd, cla, AUT0, sizeof(DEFAUT0)) < 0) {
+ if (get_AUT0(AUT0) < 0 ||
+ cyberflex_verify_AUT0(fd, cla, AUT0, sizeof(DEFAUT0)) < 0) {
+ memset(AUT0, 0, sizeof(DEFAUT0));
+ error("smartcard passphrase incorrect");
+ goto done;
+ }
+ }
+ memset(AUT0, 0, sizeof(DEFAUT0));
+ key_fid[0] = 0x00;
+ key_fid[1] = 0x12;
+ if (cyberflex_load_rsa_priv(fd, cla, key_fid, 5, 8*len, elements,
+ &sw) < 0) {
+ error("cyberflex_load_rsa_priv failed: %s", sectok_get_sw(sw));
+ goto done;
+ }
+ if (!sectok_swOK(sw))
+ goto done;
+ logit("cyberflex_load_rsa_priv done");
+ key_fid[0] = 0x73;
+ key_fid[1] = 0x68;
+ if (cyberflex_load_rsa_pub(fd, cla, key_fid, len, elements[5],
+ &sw) < 0) {
+ error("cyberflex_load_rsa_pub failed: %s", sectok_get_sw(sw));
+ goto done;
+ }
+ if (!sectok_swOK(sw))
+ goto done;
+ logit("cyberflex_load_rsa_pub done");
+ status = 0;
+
+done:
+ memset(elements[0], '\0', BN_num_bytes(prv->rsa->q));
+ memset(elements[1], '\0', BN_num_bytes(prv->rsa->p));
+ memset(elements[2], '\0', BN_num_bytes(prv->rsa->iqmp));
+ memset(elements[3], '\0', BN_num_bytes(prv->rsa->dmq1));
+ memset(elements[4], '\0', BN_num_bytes(prv->rsa->dmp1));
+ memset(elements[5], '\0', BN_num_bytes(prv->rsa->n));
+
+ for (i = 0; i < NUM_RSA_KEY_ELEMENTS; i++)
+ if (elements[i])
+ xfree(elements[i]);
+ if (fd != -1)
+ sectok_close(fd);
+ return (status);
+}
+
+char *
+sc_get_key_label(Key *key)
+{
+ return xstrdup("smartcard key");
+}
+
+#endif /* SMARTCARD && USE_SECTOK */
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