LXR linux/net/ceph/auth

   1
   2#include <linux/ceph/ceph_debug.h>
   3
   4#include <linux/err.h>
   5#include <linux/module.h>
   6#include <linux/random.h>
   7#include <linux/slab.h>
   8
   9#include <linux/ceph/decode.h>
  10#include <linux/ceph/auth.h>
  11
  12#include "auth_none.h"
  13
  14static void reset(struct ceph_auth_client *ac)
  15{
  16        struct ceph_auth_none_info *xi = ac->private;
  17
  18        xi->starting = true;
  19        xi->built_authorizer = false;
  20}
  21
  22static void destroy(struct ceph_auth_client *ac)
  23{
  24        kfree(ac->private);
  25        ac->private = NULL;
  26}
  27
  28static int is_authenticated(struct ceph_auth_client *ac)
  29{
  30        struct ceph_auth_none_info *xi = ac->private;
  31
  32        return !xi->starting;
  33}
  34
  35static int should_authenticate(struct ceph_auth_client *ac)
  36{
  37        struct ceph_auth_none_info *xi = ac->private;
  38
  39        return xi->starting;
  40}
  41
  42static int build_request(struct ceph_auth_client *ac, void *buf, void *end)
  43{
  44        return 0;
  45}
  46
  47/*
  48 * the generic auth code decode the global_id, and we carry no actual
  49 * authenticate state, so nothing happens here.
  50 */
  51static int handle_reply(struct ceph_auth_client *ac, int result,
  52                        void *buf, void *end)
  53{
  54        struct ceph_auth_none_info *xi = ac->private;
  55
  56        xi->starting = false;
  57        return result;
  58}
  59
  60/*
  61 * build an 'authorizer' with our entity_name and global_id.  we can
  62 * reuse a single static copy since it is identical for all services
  63 * we connect to.
  64 */
  65static int ceph_auth_none_create_authorizer(
  66        struct ceph_auth_client *ac, int peer_type,
  67        struct ceph_auth_handshake *auth)
  68{
  69        struct ceph_auth_none_info *ai = ac->private;
  70        struct ceph_none_authorizer *au = &ai->au;
  71        void *p, *end;
  72        int ret;
  73
  74        if (!ai->built_authorizer) {
  75                p = au->buf;
  76                end = p + sizeof(au->buf);
  77                ceph_encode_8(&p, 1);
  78                ret = ceph_entity_name_encode(ac->name, &p, end - 8);
  79                if (ret < 0)
  80                        goto bad;
  81                ceph_decode_need(&p, end, sizeof(u64), bad2);
  82                ceph_encode_64(&p, ac->global_id);
  83                au->buf_len = p - (void *)au->buf;
  84                ai->built_authorizer = true;
  85                dout("built authorizer len %d\n", au->buf_len);
  86        }
  87
  88        auth->authorizer = (struct ceph_authorizer *) au;
  89        auth->authorizer_buf = au->buf;
  90        auth->authorizer_buf_len = au->buf_len;
  91        auth->authorizer_reply_buf = au->reply_buf;
  92        auth->authorizer_reply_buf_len = sizeof (au->reply_buf);
  93
  94        return 0;
  95
  96bad2:
  97        ret = -ERANGE;
  98bad:
  99        return ret;
 100}
 101
 102static void ceph_auth_none_destroy_authorizer(struct ceph_auth_client *ac,
 103                                      struct ceph_authorizer *a)
 104{
 105        /* nothing to do */
 106}
 107
 108static const struct ceph_auth_client_ops ceph_auth_none_ops = {
 109        .name = "none",
 110        .reset = reset,
 111        .destroy = destroy,
 112        .is_authenticated = is_authenticated,
 113        .should_authenticate = should_authenticate,
 114        .build_request = build_request,
 115        .handle_reply = handle_reply,
 116        .create_authorizer = ceph_auth_none_create_authorizer,
 117        .destroy_authorizer = ceph_auth_none_destroy_authorizer,
 118};
 119
 120int ceph_auth_none_init(struct ceph_auth_client *ac)
 121{
 122        struct ceph_auth_none_info *xi;
 123
 124        dout("ceph_auth_none_init %p\n", ac);
 125        xi = kzalloc(sizeof(*xi), GFP_NOFS);
 126        if (!xi)
 127                return -ENOMEM;
 128
 129        xi->starting = true;
 130        xi->built_authorizer = false;
 131
 132        ac->protocol = CEPH_AUTH_NONE;
 133        ac->private = xi;
 134        ac->ops = &ceph_auth_none_ops;
 135        return 0;
 136}
 137
 138