From 2fc4a488978a03338ecc65403597582c77dabeea Mon Sep 17 00:00:00 2001 From: des Date: Mon, 18 Mar 2002 09:55:03 +0000 Subject: Vendor import of OpenSSH 3.1 --- crypto/openssh/scard.c | 372 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 372 insertions(+) create mode 100644 crypto/openssh/scard.c (limited to 'crypto/openssh/scard.c') diff --git a/crypto/openssh/scard.c b/crypto/openssh/scard.c new file mode 100644 index 0000000..e1b1fb6 --- /dev/null +++ b/crypto/openssh/scard.c @@ -0,0 +1,372 @@ +/* + * 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 1.17 2001/12/27 18:22:16 markus Exp $"); + +#include +#include + +#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 char *sc_reader_id = NULL; +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_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) { + status = sc_init(); + if (status < 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 (!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 %d %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, 0, NULL, &sw); + if (!sectok_swOK(sw)) { + error("sc_private_decrypt: INS_DECRYPT failed: %s", + sectok_get_sw(sw)); + 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)); + 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, 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)); + 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)); + 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 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; + + /* save original */ + orig_finish = def->finish; + smart_rsa.finish = sc_finish; + + /* 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.flags = def->flags; + smart_rsa.app_data = def->app_data; + smart_rsa.rsa_sign = def->rsa_sign; + smart_rsa.rsa_verify = def->rsa_verify; + + 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, &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(const char *id) +{ + Key *k; + int status; + + if (sc_reader_id != NULL) + xfree(sc_reader_id); + sc_reader_id = xstrdup(id); + + 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; +} +#endif /* SMARTCARD */ -- cgit v1.1