net/ceph/auth_none.c

   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
  14 static 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
  22 static void destroy(struct ceph_auth_client *ac)
  23 {
  24         kfree(ac->private);
  25         ac->private = NULL;
  26 }
  27
  28 static 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
  35 static 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 static 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  */
  51 static 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  */
  65 static int ceph_auth_none_create_authorizer(
  66         struct ceph_auth_client *ac, int peer_type,
  67         struct ceph_authorizer **a,
  68         void **buf, size_t *len,
  69         void **reply_buf, size_t *reply_len)
  70 {
  71         struct ceph_auth_none_info *ai = ac->private;
  72         struct ceph_none_authorizer *au = &ai->au;
  73         void *p, *end;
  74         int ret;
  75
  76         if (!ai->built_authorizer) {
  77                 p = au->buf;
  78                 end = p + sizeof(au->buf);
  79                 ceph_encode_8(&p, 1);
  80                 ret = ceph_entity_name_encode(ac->name, &p, end - 8);
  81                 if (ret < 0)
  82                         goto bad;
  83                 ceph_decode_need(&p, end, sizeof(u64), bad2);
  84                 ceph_encode_64(&p, ac->global_id);
  85                 au->buf_len = p - (void *)au->buf;
  86                 ai->built_authorizer = true;
  87                 dout("built authorizer len %d\n", au->buf_len);
  88         }
  89
  90         *a = (struct ceph_authorizer *)au;
  91         *buf = au->buf;
  92         *len = au->buf_len;
  93         *reply_buf = au->reply_buf;
  94         *reply_len = sizeof(au->reply_buf);
  95         return 0;
  96
  97 bad2:
  98         ret = -ERANGE;
  99 bad:
 100         return ret;
 101 }
 102
 103 static void ceph_auth_none_destroy_authorizer(struct ceph_auth_client *ac,
 104                                       struct ceph_authorizer *a)
 105 {
 106         /* nothing to do */
 107 }
 108
 109 static const struct ceph_auth_client_ops ceph_auth_none_ops = {
 110         .name = "none",
 111         .reset = reset,
 112         .destroy = destroy,
 113         .is_authenticated = is_authenticated,
 114         .should_authenticate = should_authenticate,
 115         .build_request = build_request,
 116         .handle_reply = handle_reply,
 117         .create_authorizer = ceph_auth_none_create_authorizer,
 118         .destroy_authorizer = ceph_auth_none_destroy_authorizer,
 119 };
 120
 121 int ceph_auth_none_init(struct ceph_auth_client *ac)
 122 {
 123         struct ceph_auth_none_info *xi;
 124
 125         dout("ceph_auth_none_init %p\n", ac);
 126         xi = kzalloc(sizeof(*xi), GFP_NOFS);
 127         if (!xi)
 128                 return -ENOMEM;
 129
 130         xi->starting = true;
 131         xi->built_authorizer = false;
 132
 133         ac->protocol = CEPH_AUTH_NONE;
 134         ac->private = xi;
 135         ac->ops = &ceph_auth_none_ops;
 136         return 0;
 137 }
 138