ceph/src/common/secret.c

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3 /*
   4  * Ceph - scalable distributed file system
   5  *
   6  * Copyright (C) 2011 New Dream Network
   7  *
   8  * This is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License version 2.1, as published by the Free Software
  11  * Foundation.  See file COPYING.
  12  *
  13  */
  14
  15 #include <string.h>
  16 #include <stdio.h>
  17 #include <unistd.h>
  18 #include <errno.h>
  19 #include <fcntl.h>
  20 #include <keyutils.h>
  21
  22 #include "common/armor.h"
  23 #include "common/safe_io.h"
  24
  25 int read_secret_from_file(const char *filename, char *secret, size_t max_len)
  26 {
  27   char *end;
  28   int fd;
  29   int len;
  30
  31   fd = open(filename, O_RDONLY);
  32   if (fd < 0) {
  33     perror("unable to read secretfile");
  34     return -errno;
  35   }
  36   len = safe_read(fd, secret, max_len);
  37   if (len <= 0) {
  38     perror("unable to read secret from file");
  39     close(fd);
  40     return len ? len : -ENODATA;
  41   }
  42   end = secret;
  43   while (end < secret + len && *end && *end != '\n' && *end != '\r')
  44     end++;
  45   *end = '\0';
  46   close(fd);
  47
  48   return 0;
  49 }
  50
  51 int set_kernel_secret(const char *secret, const char *key_name)
  52 {
  53   /* try to submit key to kernel via the keys api */
  54   key_serial_t serial;
  55   int ret;
  56   int secret_len = strlen(secret);
  57   char payload[((secret_len * 3) / 4) + 4];
  58
  59   if (!secret_len) {
  60     fprintf(stderr, "secret is empty.\n");
  61     return -EINVAL;
  62   }
  63
  64   ret = ceph_unarmor(payload, payload+sizeof(payload), secret, secret+secret_len);
  65   if (ret < 0) {
  66     char error_buf[80];
  67     fprintf(stderr, "secret is not valid base64: %s.\n",
  68             strerror_r(-ret, error_buf, sizeof(error_buf)));
  69     return ret;
  70   }
  71
  72   serial = add_key("ceph", key_name, payload, sizeof(payload), KEY_SPEC_PROCESS_KEYRING);
  73   if (serial == -1) {
  74     ret = -errno;
  75   }
  76
  77   return ret;
  78 }
  79
  80 int is_kernel_secret(const char *key_name)
  81 {
  82   key_serial_t serial;
  83   serial = request_key("ceph", key_name, NULL, KEY_SPEC_USER_KEYRING);
  84   return serial != -1;
  85 }