1 files changed, 205 insertions, 0 deletions
diff --git a/scd/card-dinsig.c b/scd/card-dinsig.c
new file mode 100644
index 000000000..3e461fd99
--- /dev/null
+++ b/scd/card-dinsig.c
@@ -0,0 +1,205 @@
+/* card-dinsig.c - German signature law (DINSIG) functions
+ *	Copyright (C) 2002 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+#include <config.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+#include <opensc-pkcs15.h>
+#include <ksba.h>
+
+#include "scdaemon.h"
+#include "card-common.h"
+
+static int dinsig_read_cert (CARD card, const char *certidstr,
+                             unsigned char **cert, size_t *ncert);
+
+
+
+/* See card.c for interface description.  Frankly we don't do any real
+   enumeration but just check whether the well know files are
+   available.
+ */
+static int
+dinsig_enum_keypairs (CARD card, int idx,
+                      unsigned char *keygrip, char **keyid)
+{
+  int rc;
+  unsigned char *buf;
+  size_t buflen;
+  KsbaError krc;
+  KsbaCert cert;
+
+  /* fixme: We should locate the application via the EF(DIR) and not
+     assume a Netkey card */
+  if (!idx)
+    rc = dinsig_read_cert (card, "DINSIG-DF01.C000", &buf, &buflen);
+  else if (idx == 1)
+    rc = dinsig_read_cert (card, "DINSIG-DF01.C200", &buf, &buflen);
+  else
+    rc = -1;
+  if (rc)
+    return rc;
+
+  cert = ksba_cert_new ();
+  if (!cert)
+    {
+      xfree (buf);
+      return GNUPG_Out_Of_Core;
+    }
+
+  krc = ksba_cert_init_from_mem (cert, buf, buflen); 
+  xfree (buf);
+  if (krc)
+    {
+      log_error ("failed to parse the certificate at idx %d: %s\n",
+                 idx, ksba_strerror (krc));
+      ksba_cert_release (cert);
+      return GNUPG_Card_Error;
+    }
+  if (card_help_get_keygrip (cert, keygrip))
+    {
+      log_error ("failed to calculate the keygrip at index %d\n", idx);
+      ksba_cert_release (cert);
+      return GNUPG_Card_Error;
+    }      
+  ksba_cert_release (cert);
+
+  /* return the iD */
+  if (keyid)
+    {
+      *keyid = xtrymalloc (17);
+      if (!*keyid)
+        return GNUPG_Out_Of_Core;
+      if (!idx)
+        strcpy (*keyid, "DINSIG-DF01.C000");
+      else
+        strcpy (*keyid, "DINSIG-DF01.C200");
+    }
+  
+  return 0;
+}
+
+
+
+/* See card.c for interface description */
+static int
+dinsig_read_cert (CARD card, const char *certidstr,
+                  unsigned char **cert, size_t *ncert)
+{
+  int rc;
+  struct sc_path path;
+  struct sc_file *file;
+  unsigned char *buf;
+  int buflen;
+
+  if (!strcmp (certidstr, "DINSIG-DF01.C000"))
+    sc_format_path ("3F00DF01C000", &path);
+  else if (!strcmp (certidstr, "DINSIG-DF01.C200"))
+    sc_format_path ("3F00DF01C200", &path);
+  else
+    return GNUPG_Invalid_Id;
+
+  rc = sc_select_file (card->scard, &path, &file);
+  if (rc) 
+    {
+      log_error ("sc_select_file failed: %s\n", sc_strerror (rc));
+      return map_sc_err (rc);
+    }
+  if (file->type != SC_FILE_TYPE_WORKING_EF
+      || file->ef_structure != SC_FILE_EF_TRANSPARENT)
+    {
+      log_error ("wrong type or structure of certificate EF\n");
+      sc_file_free (file);
+      return GNUPG_Card_Error;
+    }
+  if (file->size < 20) /* check against a somewhat arbitrary length */
+    { 
+      log_error ("certificate EF too short\n");
+      sc_file_free (file);
+      return GNUPG_Card_Error;
+    }
+  buf = xtrymalloc (file->size);
+  if (!buf)
+    {
+      sc_file_free (file);
+      return GNUPG_Out_Of_Core;
+    }
+      
+  rc = sc_read_binary (card->scard, 0, buf, file->size, 0);
+  if (rc >= 0 && rc != file->size)
+    {
+      log_error ("short read on certificate EF\n");
+      sc_file_free (file);
+      xfree (buf);
+      return GNUPG_Card_Error;
+    }
+  sc_file_free (file);
+  if (rc < 0) 
+    {
+      log_error ("error reading certificate EF: %s\n", sc_strerror (rc));
+      xfree (buf);
+      return map_sc_err (rc);
+    }
+  buflen = rc;
+
+  /* The object is not a plain certificate but wrapped into id-at
+     userCertificate - fixme: we should check the specs and decided
+     whether libksba should support it */
+  if (buflen > 9 && buf[0] == 0x30 && buf[4] == 6 && buf[5] == 3
+      && buf[6] == 0x55 && buf[7] == 4 && buf[8] == 0x24)
+    {
+      /* We have to strip the padding.  Although this is a good idea
+         anyway, we have to do it due to a KSBA problem; KSBA does not
+         work correct when the buffer is larger than the ASN.1
+         structure and the certificates here are padded with FF.  So
+         as a workaround we look at the outer structure to get the
+         size of the entire thing and adjust the buflen.  We can only
+         do this when there is a 2 byte length field */
+      size_t seqlen;
+      if (buf[1] == 0x82)
+        {
+          seqlen = ((buf[2] << 8) | buf[3]) + 4;
+          if (seqlen < buflen)
+            buflen = seqlen;
+        }
+      memmove (buf, buf+9, buflen-9);
+      buflen -= 9;
+    } 
+
+  *cert = buf;
+  *ncert = buflen;
+  return 0;
+}
+
+
+
+
+/* Bind our operations to the card */
+void
+card_dinsig_bind (CARD card)
+{
+  card->fnc.enum_keypairs = dinsig_enum_keypairs;
+  card->fnc.read_cert     = dinsig_read_cert;
+
+}