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
  42/*
  43 * the generic auth code decode the global_id, and we carry no actual
  44 * authenticate state, so nothing happens here.
  45 */
  46static int handle_reply(struct ceph_auth_client *ac, int result,
  47                        void *buf, void *end)
  48{
  49        struct ceph_auth_none_info *xi = ac->private;
  50
  51        xi->starting = false;
  52        return result;
  53}
  54
  55/*
  56 * build an 'authorizer' with our entity_name and global_id.  we can
  57 * reuse a single static copy since it is identical for all services
  58 * we connect to.
  59 */
  60static int ceph_auth_none_create_authorizer(
  61        struct ceph_auth_client *ac, int peer_type,
  62        struct ceph_authorizer **a,
  63        void **buf, size_t *len,
  64        void **reply_buf, size_t *reply_len)
  65{
  66        struct ceph_auth_none_info *ai = ac->private;
  67        struct ceph_none_authorizer *au = &ai->au;
  68        void *p, *end;
  69        int ret;
  70
  71        if (!ai->built_authorizer) {
  72                p = au->buf;
  73                end = p + sizeof(au->buf);
  74                ceph_encode_8(&p, 1);
  75                ret = ceph_entity_name_encode(ac->name, &p, end - 8);
  76                if (ret < 0)
  77                        goto bad;
  78                ceph_decode_need(&p, end, sizeof(u64), bad2);
  79                ceph_encode_64(&p, ac->global_id);
  80                au->buf_len = p - (void *)au->buf;
  81                ai->built_authorizer = true;
  82                dout("built authorizer len %d\n", au->buf_len);
  83        }
  84
  85        *a = (struct ceph_authorizer *)au;
  86        *buf = au->buf;
  87        *len = au->buf_len;
  88        *reply_buf = au->reply_buf;
  89        *reply_len = sizeof(au->reply_buf);
  90        return 0;
  91
  92bad2:
  93        ret = -ERANGE;
  94bad:
  95        return ret;
  96}
  97
  98static void ceph_auth_none_destroy_authorizer(struct ceph_auth_client *ac,
  99                                      struct ceph_authorizer *a)
 100{
 101        /* nothing to do */
 102}
 103
 104static const struct ceph_auth_client_ops ceph_auth_none_ops = {
 105        .name = "none",
 106        .reset = reset,
 107        .destroy = destroy,
 108        .is_authenticated = is_authenticated,
 109        .should_authenticate = should_authenticate,
 110        .handle_reply = handle_reply,
 111        .create_authorizer = ceph_auth_none_create_authorizer,
 112        .destroy_authorizer = ceph_auth_none_destroy_authorizer,
 113};
 114
 115int ceph_auth_none_init(struct ceph_auth_client *ac)
 116{
 117        struct ceph_auth_none_info *xi;
 118
 119        dout("ceph_auth_none_init %p\n", ac);
 120        xi = kzalloc(sizeof(*xi), GFP_NOFS);
 121        if (!xi)
 122                return -ENOMEM;
 123
 124        xi->starting = true;
 125        xi->built_authorizer = false;
 126
 127        ac->protocol = CEPH_AUTH_NONE;
 128        ac->private = xi;
 129        ac->ops = &ceph_auth_none_ops;
 130        return 0;
 131}
 132
 133