We have reached a state where we are able to import certs and

check the certification path.

1 files changed, 131 insertions, 0 deletions

diff --git a/sm/certpath.c b/sm/certpath.c
new file mode 100644
index 000000000..aef1612cc
--- /dev/null
+++ b/sm/certpath.c
@@ -0,0 +1,131 @@
+/* certpath.c - path validation
+ *	Copyright (C) 2001 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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h> 
+#include <time.h>
+#include <assert.h>
+
+#include <gcrypt.h>
+#include <ksba.h>
+
+#include "gpgsm.h"
+#include "keydb.h"
+#include "i18n.h"
+
+int
+gpgsm_validate_path (KsbaCert cert)
+{
+  int rc = 0, depth = 0;
+  char *issuer = NULL;
+  char *subject = NULL;
+  KEYDB_HANDLE kh = keydb_new (0);
+  KsbaCert subject_cert = NULL, issuer_cert = NULL;
+
+  if (!kh)
+    {
+      log_error (_("failed to allocated keyDB handle\n"));
+      rc = GPGSM_General_Error;
+      goto leave;
+    }
+
+  log_debug ("validate path for certificate:\n");
+  gpgsm_dump_cert (cert);
+
+  subject_cert = cert;
+
+  for (;;)
+    {
+      xfree (issuer);
+      xfree (subject);
+      issuer = ksba_cert_get_issuer (subject_cert);
+      subject = ksba_cert_get_subject (subject_cert);
+
+      if (!issuer)
+        {
+          if (DBG_X509)
+            log_debug ("ERROR: issuer missing\n");
+          rc = GPGSM_Bad_Certificate;
+          goto leave;
+        }
+
+      if (subject && !strcmp (issuer, subject))
+        {
+          if (gpgsm_check_cert_sig (subject_cert, subject_cert) )
+            {
+              log_debug ("selfsigned certificate has a BAD signatures\n");
+              rc = depth? GPGSM_Bad_Certificate_Path : GPGSM_Bad_Certificate;
+              goto leave;
+            }
+          log_debug ("selfsigned certificate is good\n");
+          break;  /* okay, a self-signed certicate is an end-point */
+        }
+      
+      depth++;
+      /* fixme: check against a maximum path length */
+
+      /* find the next cert up the tree */
+      keydb_search_reset (kh);
+      rc = keydb_search_issuer (kh, issuer);
+      if (rc)
+        {
+          log_debug ("failed to find issuer's certificate: rc=%d\n", rc);
+          rc = GPGSM_Missing_Certificate;
+          goto leave;
+        }
+
+      ksba_cert_release (issuer_cert); issuer_cert = NULL;
+      rc = keydb_get_cert (kh, &issuer_cert);
+      if (rc)
+        {
+          log_debug ("failed to get cert: rc=%d\n", rc);
+          rc = GPGSM_General_Error;
+          goto leave;
+        }
+
+      log_debug ("got issuer's certificate:\n");
+      gpgsm_dump_cert (issuer_cert);
+
+      if (gpgsm_check_cert_sig (issuer_cert, subject_cert) )
+        {
+          log_debug ("certificate has a BAD signatures\n");
+          rc = GPGSM_Bad_Certificate_Path;
+          goto leave;
+        }
+      log_debug ("certificate is good\n");
+      
+      keydb_search_reset (kh);
+      subject_cert = issuer_cert;
+      issuer_cert = NULL;
+    }
+  
+ leave:
+  xfree (issuer);
+  keydb_release (kh); 
+  ksba_cert_release (issuer_cert);
+  if (subject_cert != cert)
+    ksba_cert_release (subject_cert);
+  return rc;
+}
+