mirror of git://git.gnupg.org/gnupg.git
432 lines
11 KiB
C
432 lines
11 KiB
C
/* divert-scd.c - divert operations to the scdaemon
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* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
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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 <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <errno.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 <ctype.h>
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#include <assert.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include "agent.h"
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#include "sexp-parse.h"
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#include "i18n.h"
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static int
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ask_for_card (ctrl_t ctrl, const unsigned char *shadow_info, char **r_kid)
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{
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int rc, i;
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const unsigned char *s;
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size_t n;
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char *serialno;
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int no_card = 0;
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char *desc;
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char *want_sn, *want_kid;
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int want_sn_displen;
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*r_kid = NULL;
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s = shadow_info;
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if (*s != '(')
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return gpg_error (GPG_ERR_INV_SEXP);
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s++;
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n = snext (&s);
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if (!n)
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return gpg_error (GPG_ERR_INV_SEXP);
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want_sn = xtrymalloc (n*2+1);
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if (!want_sn)
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return out_of_core ();
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for (i=0; i < n; i++)
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sprintf (want_sn+2*i, "%02X", s[i]);
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s += n;
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/* We assume that a 20 byte serial number is a standard one which
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seems to have the property to have a zero in the last nibble. We
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don't display this '0' because it may confuse the user */
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want_sn_displen = strlen (want_sn);
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if (want_sn_displen == 20 && want_sn[19] == '0')
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want_sn_displen--;
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n = snext (&s);
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if (!n)
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return gpg_error (GPG_ERR_INV_SEXP);
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want_kid = xtrymalloc (n+1);
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if (!want_kid)
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{
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gpg_error_t tmperr = out_of_core ();
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xfree (want_sn);
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return tmperr;
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}
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memcpy (want_kid, s, n);
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want_kid[n] = 0;
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for (;;)
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{
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rc = agent_card_serialno (ctrl, &serialno);
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if (!rc)
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{
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log_debug ("detected card with S/N %s\n", serialno);
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i = strcmp (serialno, want_sn);
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xfree (serialno);
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serialno = NULL;
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if (!i)
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{
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xfree (want_sn);
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*r_kid = want_kid;
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return 0; /* yes, we have the correct card */
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}
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}
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else if (gpg_err_code (rc) == GPG_ERR_CARD_NOT_PRESENT)
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{
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log_debug ("no card present\n");
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rc = 0;
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no_card = 1;
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}
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else
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{
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log_error ("error accesing card: %s\n", gpg_strerror (rc));
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}
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if (!rc)
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{
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if (asprintf (&desc,
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"%s:%%0A%%0A"
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" \"%.*s\"",
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no_card? "Please insert the card with serial number"
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: "Please remove the current card and "
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"insert the one with serial number",
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want_sn_displen, want_sn) < 0)
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{
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rc = out_of_core ();
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}
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else
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{
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rc = agent_get_confirmation (ctrl, desc, NULL, NULL);
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free (desc);
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}
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}
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if (rc)
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{
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xfree (want_sn);
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xfree (want_kid);
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return rc;
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}
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}
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}
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/* Put the DIGEST into an DER encoded container and return it in R_VAL. */
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static int
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encode_md_for_card (const unsigned char *digest, size_t digestlen, int algo,
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unsigned char **r_val, size_t *r_len)
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{
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unsigned char *frame;
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unsigned char asn[100];
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size_t asnlen;
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*r_val = NULL;
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*r_len = 0;
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asnlen = DIM(asn);
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if (!algo || gcry_md_test_algo (algo))
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return gpg_error (GPG_ERR_DIGEST_ALGO);
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if (gcry_md_algo_info (algo, GCRYCTL_GET_ASNOID, asn, &asnlen))
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{
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log_error ("no object identifier for algo %d\n", algo);
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return gpg_error (GPG_ERR_INTERNAL);
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}
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frame = xtrymalloc (asnlen + digestlen);
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if (!frame)
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return out_of_core ();
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memcpy (frame, asn, asnlen);
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memcpy (frame+asnlen, digest, digestlen);
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if (DBG_CRYPTO)
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log_printhex ("encoded hash:", frame, asnlen+digestlen);
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*r_val = frame;
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*r_len = asnlen+digestlen;
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return 0;
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}
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/* Callback used to ask for the PIN which should be set into BUF. The
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buf has been allocated by the caller and is of size MAXBUF which
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includes the terminating null. The function should return an UTF-8
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string with the passphrase, the buffer may optionally be padded
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with arbitrary characters.
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INFO gets displayed as part of a generic string. However if the
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first character of INFO is a vertical bar all up to the next
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verical bar are considered flags and only everything after the
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second vertical bar gets displayed as the full prompt.
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Flags:
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'N' = New PIN, this requests a second prompt to repeat the the
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PIN. If the PIN is not correctly repeated it starts from
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all over.
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'A' = The PIN is an Admin PIN, SO-PIN, PUK or alike.
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Example:
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"|AN|Please enter the new security officer's PIN"
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The text "Please ..." will get displayed and the flags 'A' and 'N'
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are considered.
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*/
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static int
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getpin_cb (void *opaque, const char *info, char *buf, size_t maxbuf)
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{
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struct pin_entry_info_s *pi;
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int rc;
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ctrl_t ctrl = opaque;
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const char *ends, *s;
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int any_flags = 0;
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int newpin = 0;
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const char *again_text = NULL;
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const char *prompt = "PIN";
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if (buf && maxbuf < 2)
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return gpg_error (GPG_ERR_INV_VALUE);
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/* Parse the flags. */
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if (info && *info =='|' && (ends=strchr (info+1, '|')))
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{
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for (s=info+1; s < ends; s++)
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{
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if (*s == 'A')
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prompt = _("Admin PIN");
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else if (*s == 'N')
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newpin = 1;
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}
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info = ends+1;
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any_flags = 1;
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}
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else if (info && *info == '|')
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log_debug ("pin_cb called without proper PIN info hack\n");
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/* If BUF has been passed as NULL, we are in keypad mode: The
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callback opens the popup and immediatley returns. */
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if (!buf)
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{
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if (maxbuf == 0) /* Close the pinentry. */
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{
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agent_popup_message_stop (ctrl);
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rc = 0;
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}
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else if (maxbuf == 1) /* Open the pinentry. */
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{
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rc = agent_popup_message_start (ctrl, info, NULL);
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}
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else
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rc = gpg_error (GPG_ERR_INV_VALUE);
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return rc;
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}
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/* FIXME: keep PI and TRIES in OPAQUE. Frankly this is a whole
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mess because we should call the card's verify function from the
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pinentry check pin CB. */
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again:
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pi = gcry_calloc_secure (1, sizeof (*pi) + maxbuf + 10);
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if (!pi)
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return gpg_error_from_syserror ();
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pi->max_length = maxbuf-1;
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pi->min_digits = 0; /* we want a real passphrase */
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pi->max_digits = 8;
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pi->max_tries = 3;
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if (any_flags)
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{
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rc = agent_askpin (ctrl, info, prompt, again_text, pi);
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again_text = NULL;
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if (!rc && newpin)
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{
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struct pin_entry_info_s *pi2;
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pi2 = gcry_calloc_secure (1, sizeof (*pi) + maxbuf + 10);
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if (!pi2)
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{
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rc = gpg_error_from_syserror ();
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xfree (pi);
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return rc;
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}
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pi2->max_length = maxbuf-1;
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pi2->min_digits = 0;
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pi2->max_digits = 8;
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pi2->max_tries = 1;
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rc = agent_askpin (ctrl, _("Repeat this PIN"), prompt, NULL, pi2);
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if (!rc && strcmp (pi->pin, pi2->pin))
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{
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again_text = N_("PIN not correctly repeated; try again");
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xfree (pi2);
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xfree (pi);
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goto again;
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}
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xfree (pi2);
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}
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}
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else
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{
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char *desc;
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if ( asprintf (&desc,
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_("Please enter the PIN%s%s%s to unlock the card"),
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info? " (`":"",
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info? info:"",
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info? "')":"") < 0)
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desc = NULL;
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rc = agent_askpin (ctrl, desc?desc:info, prompt, NULL, pi);
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free (desc);
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}
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if (!rc)
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{
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strncpy (buf, pi->pin, maxbuf-1);
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buf[maxbuf-1] = 0;
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}
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xfree (pi);
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return rc;
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}
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int
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divert_pksign (ctrl_t ctrl,
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const unsigned char *digest, size_t digestlen, int algo,
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const unsigned char *shadow_info, unsigned char **r_sig)
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{
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int rc;
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char *kid;
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size_t siglen;
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unsigned char *sigval = NULL;
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rc = ask_for_card (ctrl, shadow_info, &kid);
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if (rc)
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return rc;
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if (algo == GCRY_MD_USER_TLS_MD5SHA1)
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{
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int save = ctrl->use_auth_call;
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ctrl->use_auth_call = 1;
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rc = agent_card_pksign (ctrl, kid, getpin_cb, ctrl,
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digest, digestlen, &sigval, &siglen);
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ctrl->use_auth_call = save;
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}
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else
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{
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unsigned char *data;
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size_t ndata;
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rc = encode_md_for_card (digest, digestlen, algo, &data, &ndata);
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if (!rc)
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{
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rc = agent_card_pksign (ctrl, kid, getpin_cb, ctrl,
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data, ndata, &sigval, &siglen);
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xfree (data);
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}
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}
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if (!rc)
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*r_sig = sigval;
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xfree (kid);
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return rc;
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}
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/* Decrypt the the value given asn an S-expression in CIPHER using the
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key identified by SHADOW_INFO and return the plaintext in an
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allocated buffer in R_BUF. */
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int
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divert_pkdecrypt (ctrl_t ctrl,
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const unsigned char *cipher,
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const unsigned char *shadow_info,
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char **r_buf, size_t *r_len)
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{
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int rc;
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char *kid;
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const unsigned char *s;
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size_t n;
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const unsigned char *ciphertext;
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size_t ciphertextlen;
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char *plaintext;
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size_t plaintextlen;
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s = cipher;
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if (*s != '(')
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return gpg_error (GPG_ERR_INV_SEXP);
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s++;
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n = snext (&s);
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if (!n)
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return gpg_error (GPG_ERR_INV_SEXP);
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if (!smatch (&s, n, "enc-val"))
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return gpg_error (GPG_ERR_UNKNOWN_SEXP);
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if (*s != '(')
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return gpg_error (GPG_ERR_UNKNOWN_SEXP);
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s++;
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n = snext (&s);
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if (!n)
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return gpg_error (GPG_ERR_INV_SEXP);
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if (!smatch (&s, n, "rsa"))
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return gpg_error (GPG_ERR_UNSUPPORTED_ALGORITHM);
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if (*s != '(')
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return gpg_error (GPG_ERR_UNKNOWN_SEXP);
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s++;
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n = snext (&s);
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if (!n)
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return gpg_error (GPG_ERR_INV_SEXP);
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if (!smatch (&s, n, "a"))
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return gpg_error (GPG_ERR_UNKNOWN_SEXP);
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n = snext (&s);
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if (!n)
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return gpg_error (GPG_ERR_UNKNOWN_SEXP);
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ciphertext = s;
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ciphertextlen = n;
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rc = ask_for_card (ctrl, shadow_info, &kid);
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if (rc)
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return rc;
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rc = agent_card_pkdecrypt (ctrl, kid, getpin_cb, ctrl,
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ciphertext, ciphertextlen,
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&plaintext, &plaintextlen);
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if (!rc)
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{
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*r_buf = plaintext;
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*r_len = plaintextlen;
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}
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xfree (kid);
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return rc;
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}
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int
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divert_generic_cmd (ctrl_t ctrl, const char *cmdline, void *assuan_context)
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{
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return agent_card_scd (ctrl, cmdline, getpin_cb, ctrl, assuan_context);
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}
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