initial code repo

[stor4nfv.git] / src / ceph / src / common / secret.c

diff --git a/src/ceph/src/common/secret.c b/src/ceph/src/common/secret.c
new file mode 100644 (file)
index 0000000..b6f26ec
--- /dev/null
+++ b/src/ceph/src/common/secret.c
@@ -0,0 +1,135 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2011 New Dream Network
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <keyutils.h>
+
+#include "common/armor.h"
+#include "common/safe_io.h"
+
+int read_secret_from_file(const char *filename, char *secret, size_t max_len)
+{
+  char *end;
+  int fd;
+  int len;
+
+  fd = open(filename, O_RDONLY);
+  if (fd < 0) {
+    perror("unable to read secretfile");
+    return -1;
+  }
+  len = safe_read(fd, secret, max_len);
+  if (len <= 0) {
+    perror("unable to read secret from file");
+    close(fd);
+    return -1;
+  }
+  end = secret;
+  while (end < secret + len && *end && *end != '\n' && *end != '\r')
+    end++;
+  *end = '\0';
+  close(fd);
+
+  return 0;
+}
+
+int set_kernel_secret(const char *secret, const char *key_name)
+{
+  /* try to submit key to kernel via the keys api */
+  key_serial_t serial;
+  int ret;
+  int secret_len = strlen(secret);
+  char payload[((secret_len * 3) / 4) + 4];
+
+  if (!secret_len) {
+    fprintf(stderr, "secret is empty.\n");
+    return -EINVAL;
+  }
+
+  ret = ceph_unarmor(payload, payload+sizeof(payload), secret, secret+secret_len);
+  if (ret < 0) {
+    char error_buf[80];
+    fprintf(stderr, "secret is not valid base64: %s.\n",
+           strerror_r(-ret, error_buf, sizeof(error_buf)));
+    return ret;
+  }
+
+  serial = add_key("ceph", key_name, payload, sizeof(payload), KEY_SPEC_PROCESS_KEYRING);
+  if (serial == -1) {
+    ret = -errno;
+  }
+
+  return ret;
+}
+
+int is_kernel_secret(const char *key_name)
+{
+  key_serial_t serial;
+  serial = request_key("ceph", key_name, NULL, KEY_SPEC_USER_KEYRING);
+  return serial != -1;
+}
+
+int get_secret_option(const char *secret, const char *key_name,
+                     char *secret_option, size_t max_len)
+{
+  if (!key_name) {
+    return -EINVAL;
+  }
+
+  int ret = 0;
+  int olen = strlen(key_name) + 7;
+  if (secret) {
+    olen += strlen(secret);
+  }
+  char option[olen+1];
+  int use_key = 1;
+
+  option[olen] = '\0';
+
+
+  if (secret) {
+    ret = set_kernel_secret(secret, key_name);
+    if (ret < 0) {
+      if (ret == -ENODEV || ret == -ENOSYS) {
+       /* running against older kernel; fall back to secret= in options */
+       snprintf(option, olen, "secret=%s", secret);
+       ret = 0;
+       use_key = 0;
+      } else {
+        char error_buf[80];
+       fprintf(stderr, "adding ceph secret key to kernel failed: %s.\n",
+               strerror_r(-ret, error_buf, sizeof(error_buf)));
+       return ret;
+      }
+    }
+  }
+
+  if (use_key) {
+    /* add key= option to identify key to use */
+    snprintf(option, olen, "key=%s", key_name);
+  }
+
+  if (strlen(option) + 1 > max_len) {
+    ret = -ERANGE;
+  } else {
+    secret_option[max_len-1] = '\0';
+    strncpy(secret_option, option, max_len-1);
+  }
+
+  return ret;
+}