From 8de1ee1b2b676b0d07586f0752750dd6b0fb7511 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sat, 27 Apr 2024 11:59:15 +0200
Subject: Adding upstream version 2.2.27.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 scd/app-help.c | 209 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 209 insertions(+)
 create mode 100644 scd/app-help.c

(limited to 'scd/app-help.c')

diff --git a/scd/app-help.c b/scd/app-help.c
new file mode 100644
index 0000000..4b8a024
--- /dev/null
+++ b/scd/app-help.c
@@ -0,0 +1,209 @@
+/* app-help.c - Application helper functions
+ * Copyright (C) 2004, 2009 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 3 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, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "scdaemon.h"
+#include "app-common.h"
+#include "iso7816.h"
+#include "../common/tlv.h"
+
+
+/* Count the number of bits, assuming the A represents an unsigned big
+   integer of length LEN bytes.  If A is NULL a length of 0 is
+   returned. */
+unsigned int
+app_help_count_bits (const unsigned char *a, size_t len)
+{
+  unsigned int n = len * 8;
+  int i;
+
+  if (!a)
+    return 0;
+
+  for (; len && !*a; len--, a++, n -=8)
+    ;
+  if (len)
+    {
+      for (i=7; i && !(*a & (1<<i)); i--)
+        n--;
+    }
+  return n;
+}
+
+
+/* Return the KEYGRIP for the canonical encoded public key (PK,PKLEN)
+ * as an hex encoded string in the user provided buffer HEXKEYGRIP
+ * which must be of at least 41 bytes.  If R_PKEY is not NULL and the
+ * function succeeded, the S-expression representing the key is
+ * stored there.  The caller needs to call gcry_sexp_release on
+ * that.  */
+gpg_error_t
+app_help_get_keygrip_string_pk (const void *pk, size_t pklen, char *hexkeygrip,
+                                gcry_sexp_t *r_pkey)
+{
+  gpg_error_t err;
+  gcry_sexp_t s_pkey;
+  unsigned char array[KEYGRIP_LEN];
+
+  if (r_pkey)
+    *r_pkey = NULL;
+
+  err = gcry_sexp_sscan (&s_pkey, NULL, pk, pklen);
+  if (err)
+    return err; /* Can't parse that S-expression. */
+  if (!gcry_pk_get_keygrip (s_pkey, array))
+    {
+      gcry_sexp_release (s_pkey);
+      return gpg_error (GPG_ERR_GENERAL); /* Failed to calculate the keygrip.*/
+    }
+
+  if (r_pkey)
+    *r_pkey = s_pkey;
+  else
+    gcry_sexp_release (s_pkey);
+
+  bin2hex (array, KEYGRIP_LEN, hexkeygrip);
+
+  return 0;
+}
+
+
+/* Return the KEYGRIP for the certificate CERT as an hex encoded
+ * string in the user provided buffer HEXKEYGRIP which must be of at
+ * least 41 bytes.  If R_PKEY is not NULL and the function succeeded,
+ * the S-expression representing the key is stored there.  The caller
+ * needs to call gcry_sexp_release on that. */
+gpg_error_t
+app_help_get_keygrip_string (ksba_cert_t cert, char *hexkeygrip,
+                             gcry_sexp_t *r_pkey)
+{
+  gpg_error_t err;
+  ksba_sexp_t p;
+  size_t n;
+
+  if (r_pkey)
+    *r_pkey = NULL;
+
+  p = ksba_cert_get_public_key (cert);
+  if (!p)
+    return gpg_error (GPG_ERR_BUG);
+  n = gcry_sexp_canon_len (p, 0, NULL, NULL);
+  if (!n)
+    return gpg_error (GPG_ERR_INV_SEXP);
+  err = app_help_get_keygrip_string_pk ((void*)p, n, hexkeygrip, r_pkey);
+  ksba_free (p);
+  return err;
+}
+
+
+/* Given the SLOT and the File ID FID, return the length of the
+   certificate contained in that file. Returns 0 if the file does not
+   exists or does not contain a certificate.  If R_CERTOFF is not
+   NULL, the length the header will be stored at this address; thus to
+   parse the X.509 certificate a read should start at that offset.
+
+   On success the file is still selected.
+*/
+size_t
+app_help_read_length_of_cert (int slot, int fid, size_t *r_certoff)
+{
+  gpg_error_t err;
+  unsigned char *buffer;
+  const unsigned char *p;
+  size_t buflen, n;
+  int class, tag, constructed, ndef;
+  size_t resultlen, objlen, hdrlen;
+
+  err = iso7816_select_file (slot, fid, 0);
+  if (err)
+    {
+      log_info ("error selecting FID 0x%04X: %s\n", fid, gpg_strerror (err));
+      return 0;
+    }
+
+  err = iso7816_read_binary (slot, 0, 32, &buffer, &buflen);
+  if (err)
+    {
+      log_info ("error reading certificate from FID 0x%04X: %s\n",
+                 fid, gpg_strerror (err));
+      return 0;
+    }
+
+  if (!buflen || *buffer == 0xff)
+    {
+      log_info ("no certificate contained in FID 0x%04X\n", fid);
+      xfree (buffer);
+      return 0;
+    }
+
+  p = buffer;
+  n = buflen;
+  err = parse_ber_header (&p, &n, &class, &tag, &constructed,
+                          &ndef, &objlen, &hdrlen);
+  if (err)
+    {
+      log_info ("error parsing certificate in FID 0x%04X: %s\n",
+                fid, gpg_strerror (err));
+      xfree (buffer);
+      return 0;
+    }
+
+  /* All certificates should commence with a SEQUENCE except for the
+     special ROOT CA which are enclosed in a SET. */
+  if ( !(class == CLASS_UNIVERSAL &&  constructed
+         && (tag == TAG_SEQUENCE || tag == TAG_SET)))
+    {
+      log_info ("data at FID 0x%04X does not look like a certificate\n", fid);
+      return 0;
+    }
+
+  resultlen = objlen + hdrlen;
+  if (r_certoff)
+    {
+      /* The callers want the offset to the actual certificate. */
+      *r_certoff = hdrlen;
+
+      err = parse_ber_header (&p, &n, &class, &tag, &constructed,
+                              &ndef, &objlen, &hdrlen);
+      if (err)
+        return 0;
+
+      if (class == CLASS_UNIVERSAL && tag == TAG_OBJECT_ID && !constructed)
+        {
+          /* The certificate seems to be contained in a
+             userCertificate container.  Assume the following sequence
+             is the certificate. */
+          *r_certoff += hdrlen + objlen;
+          if (*r_certoff > resultlen)
+            {
+              *r_certoff = 0;
+              return 0; /* That should never happen. */
+            }
+        }
+      else
+        *r_certoff = 0;
+    }
+
+  return resultlen;
+}
-- 
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