| /* |
| * 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. |
| */ |
| |
| #ifdef SMARTCARD |
| #include "includes.h" |
| RCSID("$OpenBSD: scard.c,v 1.10 2001/07/31 12:53:34 jakob Exp $"); |
| |
| #include <openssl/engine.h> |
| #include <sectok.h> |
| |
| #include "key.h" |
| #include "log.h" |
| #include "xmalloc.h" |
| #include "scard.h" |
| |
| #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 |
| |
| static int sc_fd = -1; |
| static int sc_reader_num = -1; |
| static int cla = 0x00; /* class */ |
| |
| /* interface to libsectok */ |
| |
| static int |
| sc_open(void) |
| { |
| int sw; |
| |
| if (sc_fd >= 0) |
| return sc_fd; |
| |
| sc_fd = sectok_open(sc_reader_num, 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 %d not present, skipping", |
| sc_reader_num); |
| 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; |
| |
| len = sw = 0; |
| |
| if (sc_fd < 0) { |
| status = sc_init(); |
| if (status < 0 ) |
| return status; |
| } |
| |
| /* 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)); |
| sc_close(); |
| return -1; |
| } |
| 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 (!sectok_swOK(sw)) { |
| error("could not obtain public key: %s", sectok_get_sw(sw)); |
| xfree(n); |
| return -1; |
| } |
| 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"); |
| xfree(n); |
| sc_close(); |
| return -1; |
| } |
| xfree(n); |
| |
| /* 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"); |
| return -1; |
| } |
| |
| p = key_fingerprint(k, SSH_FP_MD5, SSH_FP_HEX); |
| debug("fingerprint %d %s", key_size(k), p); |
| xfree(p); |
| |
| return 0; |
| } |
| |
| /* 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; |
| |
| 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, 0, NULL, &sw); |
| if (!sectok_swOK(sw)) { |
| error("sc_private_decrypt: INS_DECRYPT failed: %s", |
| sectok_get_sw(sw)); |
| sc_close(); |
| goto err; |
| } |
| sectok_apdu(sc_fd, CLA_SSH, INS_GET_RESPONSE, 0, 0, 0, NULL, |
| len, padded, &sw); |
| if (!sectok_swOK(sw)) { |
| error("sc_private_decrypt: INS_GET_RESPONSE failed: %s", |
| sectok_get_sw(sw)); |
| sc_close(); |
| goto err; |
| } |
| olen = RSA_padding_check_PKCS1_type_2(to, len, padded + 1, len - 1, |
| len); |
| err: |
| if (padded) |
| xfree(padded); |
| 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; |
| |
| 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, 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, 0, NULL, &sw); |
| if (!sectok_swOK(sw)) { |
| error("sc_private_decrypt: INS_DECRYPT failed: %s", |
| sectok_get_sw(sw)); |
| sc_close(); |
| goto err; |
| } |
| sectok_apdu(sc_fd, CLA_SSH, INS_GET_RESPONSE, 0, 0, 0, NULL, |
| len, to, &sw); |
| if (!sectok_swOK(sw)) { |
| error("sc_private_decrypt: INS_GET_RESPONSE failed: %s", |
| sectok_get_sw(sw)); |
| sc_close(); |
| goto err; |
| } |
| err: |
| if (padded) |
| xfree(padded); |
| return (len >= 0 ? len : status); |
| } |
| |
| /* engine for overloading private key operations */ |
| |
| static ENGINE *smart_engine = NULL; |
| static RSA_METHOD smart_rsa = |
| { |
| "sectok", |
| NULL, |
| NULL, |
| NULL, |
| NULL, |
| NULL, |
| NULL, |
| NULL, |
| NULL, |
| 0, |
| NULL, |
| }; |
| |
| ENGINE * |
| sc_get_engine(void) |
| { |
| RSA_METHOD *def; |
| |
| def = RSA_get_default_openssl_method(); |
| |
| /* overload */ |
| smart_rsa.rsa_priv_enc = sc_private_encrypt; |
| smart_rsa.rsa_priv_dec = sc_private_decrypt; |
| |
| /* just use the OpenSSL version */ |
| smart_rsa.rsa_pub_enc = def->rsa_pub_enc; |
| smart_rsa.rsa_pub_dec = def->rsa_pub_dec; |
| smart_rsa.rsa_mod_exp = def->rsa_mod_exp; |
| smart_rsa.bn_mod_exp = def->bn_mod_exp; |
| smart_rsa.init = def->init; |
| smart_rsa.finish = def->finish; |
| smart_rsa.flags = def->flags; |
| smart_rsa.app_data = def->app_data; |
| smart_rsa.rsa_sign = def->rsa_sign; |
| smart_rsa.rsa_verify = def->rsa_verify; |
| |
| smart_engine = ENGINE_new(); |
| |
| ENGINE_set_id(smart_engine, "sectok"); |
| ENGINE_set_name(smart_engine, "libsectok"); |
| ENGINE_set_RSA(smart_engine, &smart_rsa); |
| 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; |
| } |
| |
| void |
| sc_close(void) |
| { |
| if (sc_fd >= 0) { |
| sectok_close(sc_fd); |
| sc_fd = -1; |
| } |
| } |
| |
| Key * |
| sc_get_key(int num) |
| { |
| Key *k; |
| int status; |
| |
| sc_reader_num = num; |
| 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; |
| } |
| return k; |
| sc_close(); |
| } |
| #endif |