1 files changed, 115 insertions, 0 deletions
diff --git a/ks_mmap.c b/ks_mmap.c
new file mode 100644
index 0000000..3ff06a3
--- /dev/null
+++ b/ks_mmap.c
@@ -0,0 +1,115 @@
+/*
+ * ks_mmap.c
+ * ---------
+ * Keystore implementation over POSIX mmap().
+ *
+ * Authors: Rob Austein
+ * Copyright (c) 2015, NORDUnet A/S All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * - Redistributions of source code must retain the above copyright notice,
+ *   this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ *
+ * - Neither the name of the NORDUnet nor the names of its contributors may
+ *   be used to endorse or promote products derived from this software
+ *   without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <string.h>
+#include <sys/errno.h>
+
+#include "hal.h"
+#include "hal_internal.h"
+
+#ifndef HAL_KS_MMAP_FILE
+#define HAL_KS_MMAP_FILE ".cryptech_hal_keystore"
+#endif
+
+static hal_ks_keydb_t *db;
+
+const hal_ks_keydb_t *hal_ks_get_keydb(void)
+{
+  if (db != NULL)
+    return db;
+
+  const char * const env  = getenv("CRYPTECH_KEYSTORE");
+  const char * const home = getenv("HOME");
+  const char * const base = HAL_KS_MMAP_FILE;
+  const unsigned pagemask = getpagesize() - 1;
+  const size_t len = (sizeof(hal_ks_keydb_t) + pagemask) & ~pagemask;
+
+  char fn_[strlen(base) + (home == NULL ? 0 : strlen(home)) + 2];
+  const char *fn = fn_;
+  int fd;
+
+  if (env != NULL)
+    fn = env;
+  else if (home == NULL)
+    fn = base;
+  else
+    strcat(strcat(strcpy(fn_, home), "/"), base);
+    
+  if ((fd = open(fn, O_RDWR | O_CREAT | O_EXCL, 0600)) >= 0) {
+    uint8_t zeros[len];
+    memset(zeros, 0, sizeof(zeros));
+    (void) write(fd, zeros, sizeof(zeros));
+  }
+  else if (errno == EEXIST) {
+    fd = open(fn, O_RDWR | O_CREAT, 0600);
+  }
+
+  if (fd >= 0)
+    db = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_FILE | MAP_SHARED, fd, 0);
+
+  (void) close(fd);
+
+  return db;
+}
+
+hal_error_t hal_ks_set_keydb(const hal_ks_key_t * const key,
+                             const int loc)
+{
+  if (key == NULL || loc < 0 || loc >= sizeof(db->keys)/sizeof(*db->keys) || key->in_use)
+    return HAL_ERROR_BAD_ARGUMENTS;
+
+  db->keys[loc] = *key;
+  db->keys[loc].in_use = 1;
+  return HAL_OK;
+}
+
+hal_error_t hal_ks_del_keydb(const int loc)
+{
+  if (loc < 0 || loc >= sizeof(db->keys)/sizeof(*db->keys))
+    return HAL_ERROR_BAD_ARGUMENTS;
+
+  db->keys[loc].in_use = 0;
+  memset(&db->keys[loc], 0, sizeof(db->keys[loc]));
+  return HAL_OK;
+}
+
+/*
+ * Local variables:
+ * indent-tabs-mode: nil
+ * End:
+ */