+/* $OpenBSD: scard.c,v 1.36 2006/11/06 21:25:28 markus Exp $ */
/*
* Copyright (c) 2001 Markus Friedl. All rights reserved.
*
*/
#include "includes.h"
-#ifdef SMARTCARD
-RCSID("$OpenBSD: scard.c,v 1.17 2001/12/27 18:22:16 markus Exp $");
+#if defined(SMARTCARD) && defined(USE_SECTOK)
+
+#include <sys/types.h>
-#include <openssl/engine.h>
#include <sectok.h>
+#include <stdarg.h>
+#include <string.h>
+
+#include <openssl/evp.h>
+#include "xmalloc.h"
#include "key.h"
#include "log.h"
-#include "xmalloc.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 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
if (status == SCARD_ERROR_NOCARD) {
return SCARD_ERROR_NOCARD;
}
- if (status < 0 ) {
+ if (status < 0) {
error("sc_open failed");
return status;
}
n = NULL;
if (sc_fd < 0) {
- status = sc_init();
- if (status < 0 )
+ if (sc_init() < 0)
goto err;
}
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;
status = 0;
p = key_fingerprint(k, SSH_FP_MD5, SSH_FP_HEX);
- debug("fingerprint %d %s", key_size(k), p);
+ debug("fingerprint %u %s", key_size(k), p);
xfree(p);
err:
/* private key operations */
static int
-sc_private_decrypt(int flen, u_char *from, u_char *to, RSA *rsa, int padding)
+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;
olen = len = sw = 0;
if (sc_fd < 0) {
status = sc_init();
- if (status < 0 )
+ if (status < 0)
goto err;
}
if (padding != RSA_PKCS1_PADDING)
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_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);
}
- 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",
+ error("sc_private_decrypt: INS_DECRYPT failed: %s",
sectok_get_sw(sw));
goto err;
}
}
static int
-sc_private_encrypt(int flen, u_char *from, u_char *to, RSA *rsa, int padding)
+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 )
+ if (status < 0)
goto err;
}
if (padding != RSA_PKCS1_PADDING)
len = BN_num_bytes(rsa->n);
padded = xmalloc(len);
- if (RSA_padding_add_PKCS1_type_1(padded, len, from, flen) <= 0) {
+ 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, 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_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);
}
- 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",
+ error("sc_private_encrypt: INS_DECRYPT failed: %s",
sectok_get_sw(sw));
goto err;
}
return 1;
}
-
/* engine for overloading private key operations */
-static ENGINE *smart_engine = NULL;
-static RSA_METHOD smart_rsa =
+static RSA_METHOD *
+sc_get_rsa_method(void)
{
- "sectok",
- NULL,
- NULL,
- NULL,
- NULL,
- NULL,
- NULL,
- NULL,
- NULL,
- 0,
- NULL,
-};
-
-ENGINE *
-sc_get_engine(void)
-{
- RSA_METHOD *def;
+ static RSA_METHOD smart_rsa;
+ const RSA_METHOD *def = RSA_get_default_method();
+
+ /* use the OpenSSL version */
+ memcpy(&smart_rsa, def, sizeof(smart_rsa));
- def = RSA_get_default_openssl_method();
+ smart_rsa.name = "sectok";
/* overload */
smart_rsa.rsa_priv_enc = sc_private_encrypt;
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;
+ 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, &smart_rsa);
+
+ 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());
return smart_engine;
}
+#endif
void
sc_close(void)
}
}
-Key *
-sc_get_key(const char *id)
+Key **
+sc_get_keys(const char *id, const char *pin)
{
- Key *k;
- int status;
+ 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;
key_free(k);
return NULL;
}
- if (status < 0 ) {
+ if (status < 0) {
error("sc_read_pubkey failed");
key_free(k);
return NULL;
}
- return k;
+ 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);
}
-#endif /* SMARTCARD */
+
+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 */
andersk / openssh.git / blobdiff