2019-02-25 09:28:22 +01:00
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/* card-yubikey.c - Yubikey specific functions.
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2019-02-13 09:46:36 +01:00
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* Copyright (C) 2019 g10 Code GmbH
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <https://www.gnu.org/licenses/>.
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* SPDX-License-Identifier: GPL-3.0-or-later
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include "../common/util.h"
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#include "../common/i18n.h"
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#include "../common/tlv.h"
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#include "../common/ttyio.h"
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2019-02-25 09:28:22 +01:00
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#include "gpg-card.h"
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2019-02-13 09:46:36 +01:00
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/* Object to describe requested interface options. */
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struct iface_s {
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unsigned int usb:1;
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unsigned int nfc:1;
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};
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/* Bit flags as used by the fields in struct ykapps_s. */
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#define YKAPP_USB_SUPPORTED 0x01
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#define YKAPP_USB_ENABLED 0x02
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#define YKAPP_NFC_SUPPORTED 0x04
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#define YKAPP_NFC_ENABLED 0x08
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#define YKAPP_SELECTED 0x80 /* Selected by the command. */
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/* An object to describe the applications on a Yubikey. Each field
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* has 8 bits to hold the above flag values. */
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struct ykapps_s {
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unsigned int otp:8;
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unsigned int u2f:8;
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unsigned int opgp:8;
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unsigned int piv:8;
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unsigned int oath:8;
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unsigned int fido2:8;
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};
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/* Helper to parse an unsigned integer config value consisting of bit
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* flags. TAG select the config item and MASK is the mask ORed into
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* the value for a set bit. The function modifies YK. */
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static gpg_error_t
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parse_ul_config_value (struct ykapps_s *yk,
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const unsigned char *config, size_t configlen,
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int tag, unsigned int mask)
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{
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const unsigned char *s;
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size_t n;
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unsigned long ul = 0;
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int i;
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s = find_tlv (config, configlen, tag, &n);
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if (s && n)
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{
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if (n > sizeof ul)
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{
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log_error ("too large integer in Yubikey config tag %02x detected\n",
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tag);
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if (opt.verbose)
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log_printhex (config, configlen, "config:");
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return gpg_error (GPG_ERR_CARD);
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}
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for (i=0; i < n; i++)
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{
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ul <<=8;
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ul |= s[i];
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}
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if (ul & 0x01)
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yk->otp |= mask;
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if (ul & 0x02)
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yk->u2f |= mask;
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if (ul & 0x08)
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yk->opgp |= mask;
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if (ul & 0x10)
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yk->piv |= mask;
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if (ul & 0x20)
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yk->oath |= mask;
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if (ul & 0x200)
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yk->fido2 |= mask;
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}
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return 0;
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}
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/* Create an unsigned integer config value for TAG from the data in YK
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* and store it the provided 4 byte buffer RESULT. If ENABLE is true
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* the respective APP_SELECTED bit in YK sets the corresponding bit
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* flags, it is is false that bit flag is cleared. IF APP_SELECTED is
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* not set the bit flag is not changed. */
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static void
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set_ul_config_value (struct ykapps_s *yk,
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unsigned int bitflag, int tag, unsigned int enable,
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unsigned char *result)
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{
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unsigned long ul = 0;
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/* First set the current values. */
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if ((yk->otp & bitflag))
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ul |= 0x01;
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if ((yk->u2f & bitflag))
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ul |= 0x02;
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if ((yk->opgp & bitflag))
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ul |= 0x08;
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if ((yk->piv & bitflag))
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ul |= 0x10;
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if ((yk->oath & bitflag))
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ul |= 0x20;
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if ((yk->fido2 & bitflag))
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ul |= 0x200;
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/* Then enable or disable the bits according to the selection flag. */
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if (enable)
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{
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if ((yk->otp & YKAPP_SELECTED))
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ul |= 0x01;
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if ((yk->u2f & YKAPP_SELECTED))
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ul |= 0x02;
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if ((yk->opgp & YKAPP_SELECTED))
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ul |= 0x08;
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if ((yk->piv & YKAPP_SELECTED))
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ul |= 0x10;
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if ((yk->oath & YKAPP_SELECTED))
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ul |= 0x20;
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if ((yk->fido2 & YKAPP_SELECTED))
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ul |= 0x200;
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}
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else
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{
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if ((yk->otp & YKAPP_SELECTED))
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ul &= ~0x01;
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if ((yk->u2f & YKAPP_SELECTED))
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ul &= ~0x02;
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if ((yk->opgp & YKAPP_SELECTED))
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ul &= ~0x08;
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if ((yk->piv & YKAPP_SELECTED))
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ul &= ~0x10;
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if ((yk->oath & YKAPP_SELECTED))
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ul &= ~0x20;
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if ((yk->fido2 & YKAPP_SELECTED))
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ul &= ~0x200;
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}
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/* Make sure that we do not disable the CCID transport. Without
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* CCID we won't have any way to change the configuration again. We
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* would instead need one of the other Yubikey tools to enable an
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* application and thus its transport again. */
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if (bitflag == YKAPP_USB_ENABLED && !(ul & (0x08|0x10|0x20)))
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{
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2019-02-21 08:42:33 +01:00
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log_info ("Enabling PIV to have at least one CCID transport\n");
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2019-02-13 09:46:36 +01:00
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ul |= 0x10;
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}
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result[0] = tag;
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result[1] = 2;
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result[2] = ul >> 8;
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result[3] = ul;
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}
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/* Print the info from YK. */
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static void
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yk_list (estream_t fp, struct ykapps_s *yk)
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{
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if (opt.interactive)
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tty_fprintf (fp, ("Application USB NFC\n"
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"-----------------------\n"));
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tty_fprintf (fp, "OTP %s %s\n",
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(yk->otp & YKAPP_USB_SUPPORTED)?
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(yk->otp & YKAPP_USB_ENABLED? "yes" : "no ") : "- ",
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(yk->otp & YKAPP_NFC_SUPPORTED)?
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(yk->otp & YKAPP_NFC_ENABLED? "yes" : "no ") : "- ");
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tty_fprintf (fp, "U2F %s %s\n",
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(yk->otp & YKAPP_USB_SUPPORTED)?
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(yk->otp & YKAPP_USB_ENABLED? "yes" : "no ") : "- ",
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(yk->otp & YKAPP_NFC_SUPPORTED)?
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(yk->otp & YKAPP_NFC_ENABLED? "yes" : "no ") : "- ");
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tty_fprintf (fp, "OPGP %s %s\n",
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(yk->opgp & YKAPP_USB_SUPPORTED)?
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(yk->opgp & YKAPP_USB_ENABLED? "yes" : "no ") : "- ",
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(yk->opgp & YKAPP_NFC_SUPPORTED)?
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(yk->opgp & YKAPP_NFC_ENABLED? "yes" : "no ") : "- ");
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tty_fprintf (fp, "PIV %s %s\n",
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(yk->piv & YKAPP_USB_SUPPORTED)?
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(yk->piv & YKAPP_USB_ENABLED? "yes" : "no ") : "- ",
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(yk->piv & YKAPP_NFC_SUPPORTED)?
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(yk->piv & YKAPP_NFC_ENABLED? "yes" : "no ") : "- ");
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tty_fprintf (fp, "OATH %s %s\n",
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(yk->oath & YKAPP_USB_SUPPORTED)?
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(yk->oath & YKAPP_USB_ENABLED? "yes" : "no ") : "- ",
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(yk->oath & YKAPP_NFC_SUPPORTED)?
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(yk->oath & YKAPP_NFC_ENABLED? "yes" : "no ") : "- ");
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tty_fprintf (fp, "FIDO2 %s %s\n",
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(yk->fido2 & YKAPP_USB_SUPPORTED)?
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(yk->fido2 & YKAPP_USB_ENABLED? "yes" : "no ") : "- ",
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(yk->fido2 & YKAPP_NFC_SUPPORTED)?
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(yk->fido2 & YKAPP_NFC_ENABLED? "yes" : "no ") : "- ");
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}
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/* Enable disable the apps as marked in YK with flag YKAPP_SELECTED. */
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static gpg_error_t
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yk_enable_disable (struct ykapps_s *yk, struct iface_s *iface,
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const unsigned char *config, size_t configlen, int enable)
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{
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gpg_error_t err = 0;
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unsigned char apdu[100];
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unsigned int apdulen;
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/* const unsigned char *s; */
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/* size_t n; */
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char *hexapdu = NULL;
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apdulen = 0;
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apdu[apdulen++] = 0x00;
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apdu[apdulen++] = 0x1c; /* Write Config instruction. */
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apdu[apdulen++] = 0x00;
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apdu[apdulen++] = 0x00;
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apdu[apdulen++] = 0x00; /* Lc will be fixed up later. */
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apdu[apdulen++] = 0x00; /* Length of data will also be fixed up later. */
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/* The ykman tool has no way to set NFC and USB flags in one go.
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* Reasoning about the Yubikey's firmware it seems plausible that
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* combining should work. Let's try it here if the user called for
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* setting both interfaces. */
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if (iface->nfc)
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{
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set_ul_config_value (yk, YKAPP_NFC_ENABLED, 0x0e, enable, apdu+apdulen);
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apdulen += 4;
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}
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if (iface->usb)
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{
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set_ul_config_value (yk, YKAPP_USB_ENABLED, 0x03, enable, apdu+apdulen);
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apdulen += 4;
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/* Yubikey's ykman copies parts of the config data when writing
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* the config for USB. Below is a commented example on how that
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* can be done. */
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(void)config;
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(void)configlen;
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/* Copy the device flags. */
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/* s = find_tlv (config, configlen, 0x08, &n); */
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/* if (s && n) */
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/* { */
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/* s -= 2; */
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/* n += 2; */
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/* if (apdulen + n > sizeof apdu) */
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/* { */
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/* err = gpg_error (GPG_ERR_BUFFER_TOO_SHORT); */
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/* goto leave; */
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/* } */
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/* memcpy (apdu+apdulen, s, n); */
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/* apdulen += n; */
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/* } */
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}
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if (iface->nfc || iface->usb)
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{
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if (apdulen + 2 > sizeof apdu)
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{
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err = gpg_error (GPG_ERR_BUFFER_TOO_SHORT);
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goto leave;
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}
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/* Disable the next two lines to let the card reboot. Not doing
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* this is however more convenient for this tool because further
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* commands don't end up with an error. It seems to be better
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* that a "reset" command from gpg-card-tool is run at the
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* user's discretion. */
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/* apdu[apdulen++] = 0x0c; /\* Reboot tag *\/ */
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/* apdu[apdulen++] = 0; /\* No data for reboot. *\/ */
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/* Fixup the lngth bytes. */
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apdu[4] = apdulen - 6 + 1;
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apdu[5] = apdulen - 6;
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hexapdu = bin2hex (apdu, apdulen, NULL);
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if (!hexapdu)
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err = gpg_error_from_syserror ();
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else
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err = send_apdu (hexapdu, "YK.write_config", 0, NULL, NULL);
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}
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leave:
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xfree (hexapdu);
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return err;
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}
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/* Implementation part of cmd_yubikey. ARGV is an array of size ARGc
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* with the argumets given to the yubikey command. Note that ARGV has
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Spelling cleanup.
No functional changes, just fixing minor spelling issues.
---
Most of these were identified from the command line by running:
codespell \
--ignore-words-list fpr,stati,keyserver,keyservers,asign,cas,iff,ifset \
--skip '*.po,ChangeLog*,help.*.txt,*.jpg,*.eps,*.pdf,*.png,*.gpg,*.asc' \
doc g13 g10 kbx agent artwork scd tests tools am common dirmngr sm \
NEWS README README.maint TODO
Signed-off-by: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
2020-02-18 15:34:42 +01:00
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* no terminating NULL so that ARGC must be considered. FP is the
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2019-02-13 09:46:36 +01:00
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* stream to output information. This function must only be called on
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* Yubikeys. */
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gpg_error_t
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common,agent,dirmngr,g10,tools: Fix split_fields API.
* common/stringhelp.h (split_fields): Use const * for the strings in
the ARRAY.
(split_fields_colon): Likewise.
* common/stringhelp.c (split_fields, split_fields_colon): Fix
the implementation.
* agent/call-scd.c, agent/command.c: Follow the change.
* common/t-stringhelp.c, dirmngr/loadswdb.c: Likewise.
* g10/call-agent.c, tools/card-call-scd.c: Likewise.
* tools/card-yubikey.c, tools/gpg-card.c: Likewise.
* tools/gpg-card.h, tools/gpg-wks-client.c: Likewise.
* tools/gpgconf-comp.c, tools/gpgconf.c: Likewise.
* tools/wks-util.c: Likewise.
--
The strings in the ARRAY don't need to be released by caller, as those
are references. It's easier to follow the code when it's explicitly
const *.
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
2020-09-18 03:20:23 +02:00
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yubikey_commands (card_info_t info, estream_t fp, int argc, const char *argv[])
|
2019-02-13 09:46:36 +01:00
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|
|
{
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gpg_error_t err;
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enum {ykLIST, ykENABLE, ykDISABLE } cmd;
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struct iface_s iface = {0,0};
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struct ykapps_s ykapps = {0};
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unsigned char *config = NULL;
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|
|
size_t configlen;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
if (!argc)
|
|
|
|
return gpg_error (GPG_ERR_SYNTAX);
|
|
|
|
|
|
|
|
/* Parse command. */
|
|
|
|
if (!ascii_strcasecmp (argv[0], "list"))
|
|
|
|
cmd = ykLIST;
|
|
|
|
else if (!ascii_strcasecmp (argv[0], "enable"))
|
|
|
|
cmd = ykENABLE;
|
|
|
|
else if (!ascii_strcasecmp (argv[0], "disable"))
|
|
|
|
cmd = ykDISABLE;
|
|
|
|
else
|
|
|
|
{
|
|
|
|
err = gpg_error (GPG_ERR_UNKNOWN_COMMAND);
|
|
|
|
goto leave;
|
|
|
|
}
|
|
|
|
|
2019-03-28 10:56:28 +01:00
|
|
|
if (info->cardversion < 0x050000 && cmd != ykLIST)
|
|
|
|
{
|
|
|
|
log_info ("Sub-command '%s' is only support by Yubikey-5 and later\n",
|
|
|
|
argv[0]);
|
|
|
|
err = gpg_error (GPG_ERR_NOT_SUPPORTED);
|
|
|
|
goto leave;
|
|
|
|
}
|
|
|
|
|
2019-02-13 09:46:36 +01:00
|
|
|
/* Parse interface if needed. */
|
|
|
|
if (cmd == ykLIST)
|
|
|
|
iface.usb = iface.nfc = 1;
|
|
|
|
else if (argc < 2)
|
|
|
|
{
|
|
|
|
err = gpg_error (GPG_ERR_SYNTAX);
|
|
|
|
goto leave;
|
|
|
|
}
|
|
|
|
else if (!ascii_strcasecmp (argv[1], "usb"))
|
|
|
|
iface.usb = 1;
|
|
|
|
else if (!ascii_strcasecmp (argv[1], "nfc"))
|
|
|
|
iface.nfc = 1;
|
|
|
|
else if (!ascii_strcasecmp (argv[1], "all") || !strcmp (argv[1], "*"))
|
|
|
|
iface.usb = iface.nfc = 1;
|
|
|
|
else
|
|
|
|
{
|
|
|
|
err = gpg_error (GPG_ERR_SYNTAX);
|
|
|
|
goto leave;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Parse list of applications. */
|
|
|
|
for (i=2; i < argc; i++)
|
|
|
|
{
|
|
|
|
if (!ascii_strcasecmp (argv[i], "otp"))
|
|
|
|
ykapps.otp = 0x80;
|
|
|
|
else if (!ascii_strcasecmp (argv[i], "u2f"))
|
|
|
|
ykapps.u2f = 0x80;
|
|
|
|
else if (!ascii_strcasecmp (argv[i], "opgp")
|
|
|
|
||!ascii_strcasecmp (argv[i], "openpgp"))
|
|
|
|
ykapps.opgp = 0x80;
|
|
|
|
else if (!ascii_strcasecmp (argv[i], "piv"))
|
|
|
|
ykapps.piv = 0x80;
|
|
|
|
else if (!ascii_strcasecmp (argv[i], "oath")
|
|
|
|
|| !ascii_strcasecmp (argv[i], "oauth"))
|
|
|
|
ykapps.oath = 0x80;
|
|
|
|
else if (!ascii_strcasecmp (argv[i], "fido2"))
|
|
|
|
ykapps.fido2 = 0x80;
|
|
|
|
else if (!ascii_strcasecmp (argv[i], "all")|| !strcmp (argv[i], "*"))
|
|
|
|
{
|
|
|
|
ykapps.otp = ykapps.u2f = ykapps.opgp = ykapps.piv = ykapps.oath
|
|
|
|
= ykapps.fido2 = 0x80;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
err = gpg_error (GPG_ERR_SYNTAX);
|
|
|
|
goto leave;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Select the Yubikey Manager application. */
|
|
|
|
err = send_apdu ("00A4040008a000000527471117", "Select.YK-Manager", 0,
|
|
|
|
NULL, NULL);
|
|
|
|
if (err)
|
|
|
|
goto leave;
|
|
|
|
/* Send the read config command. */
|
|
|
|
err = send_apdu ("001D000000", "YK.read_config", 0, &config, &configlen);
|
|
|
|
if (err)
|
|
|
|
goto leave;
|
|
|
|
if (!configlen || *config > configlen - 1)
|
|
|
|
{
|
|
|
|
/* The length byte is shorter than the actual length. */
|
|
|
|
log_error ("Yubikey returned improper config data\n");
|
|
|
|
log_printhex (config, configlen, "config:");
|
|
|
|
err = gpg_error (GPG_ERR_CARD);
|
|
|
|
goto leave;
|
|
|
|
}
|
|
|
|
if (configlen-1 > *config)
|
|
|
|
{
|
|
|
|
log_info ("Extra config data ignored\n");
|
|
|
|
log_printhex (config, configlen, "config:");
|
|
|
|
}
|
|
|
|
configlen = *config;
|
|
|
|
|
|
|
|
err = parse_ul_config_value (&ykapps, config+1, configlen,
|
|
|
|
0x01, YKAPP_USB_SUPPORTED);
|
|
|
|
if (!err)
|
|
|
|
err = parse_ul_config_value (&ykapps, config+1, configlen,
|
|
|
|
0x03, YKAPP_USB_ENABLED);
|
|
|
|
if (!err)
|
|
|
|
err = parse_ul_config_value (&ykapps, config+1, configlen,
|
|
|
|
0x0d, YKAPP_NFC_SUPPORTED);
|
|
|
|
if (!err)
|
|
|
|
err = parse_ul_config_value (&ykapps, config+1, configlen,
|
|
|
|
0x0e, YKAPP_NFC_ENABLED);
|
|
|
|
if (err)
|
|
|
|
goto leave;
|
|
|
|
|
|
|
|
switch (cmd)
|
|
|
|
{
|
|
|
|
case ykLIST: yk_list (fp, &ykapps); break;
|
|
|
|
case ykENABLE: err = yk_enable_disable (&ykapps, &iface,
|
|
|
|
config+1, configlen, 1); break;
|
|
|
|
case ykDISABLE: err = yk_enable_disable (&ykapps, &iface,
|
|
|
|
config+1, configlen, 0); break;
|
|
|
|
}
|
|
|
|
|
|
|
|
leave:
|
|
|
|
xfree (config);
|
|
|
|
return err;
|
|
|
|
}
|