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 /*
  43  * the generic auth code decode the global_id, and we carry no actual
  44  * authenticate state, so nothing happens here.
  45  */
  46 static 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  */
  60 static 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
  92 bad2:
  93         ret = -ERANGE;
  94 bad:
  95         return ret;
  96 }
  97
  98 static void ceph_auth_none_destroy_authorizer(struct ceph_auth_client *ac,
  99                                       struct ceph_authorizer *a)
 100 {
 101         /* nothing to do */
 102 }
 103
 104 static 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
 115 int 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