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 }
  20
  21 static void destroy(struct ceph_auth_client *ac)
  22 {
  23         kfree(ac->private);
  24         ac->private = NULL;
  25 }
  26
  27 static int is_authenticated(struct ceph_auth_client *ac)
  28 {
  29         struct ceph_auth_none_info *xi = ac->private;
  30
  31         return !xi->starting;
  32 }
  33
  34 static int should_authenticate(struct ceph_auth_client *ac)
  35 {
  36         struct ceph_auth_none_info *xi = ac->private;
  37
  38         return xi->starting;
  39 }
  40
  41 static int ceph_auth_none_build_authorizer(struct ceph_auth_client *ac,
  42                                            struct ceph_none_authorizer *au)
  43 {
  44         void *p = au->buf;
  45         void *const end = p + sizeof(au->buf);
  46         int ret;
  47
  48         ceph_encode_8_safe(&p, end, 1, e_range);
  49         ret = ceph_entity_name_encode(ac->name, &p, end);
  50         if (ret < 0)
  51                 return ret;
  52
  53         ceph_encode_64_safe(&p, end, ac->global_id, e_range);
  54         au->buf_len = p - (void *)au->buf;
  55         dout("%s built authorizer len %d\n", __func__, au->buf_len);
  56         return 0;
  57
  58 e_range:
  59         return -ERANGE;
  60 }
  61
  62 static int build_request(struct ceph_auth_client *ac, void *buf, void *end)
  63 {
  64         return 0;
  65 }
  66
  67 /*
  68  * the generic auth code decode the global_id, and we carry no actual
  69  * authenticate state, so nothing happens here.
  70  */
  71 static int handle_reply(struct ceph_auth_client *ac, int result,
  72                         void *buf, void *end)
  73 {
  74         struct ceph_auth_none_info *xi = ac->private;
  75
  76         xi->starting = false;
  77         return result;
  78 }
  79
  80 static void ceph_auth_none_destroy_authorizer(struct ceph_authorizer *a)
  81 {
  82         kfree(a);
  83 }
  84
  85 /*
  86  * build an 'authorizer' with our entity_name and global_id.  it is
  87  * identical for all services we connect to.
  88  */
  89 static int ceph_auth_none_create_authorizer(
  90         struct ceph_auth_client *ac, int peer_type,
  91         struct ceph_auth_handshake *auth)
  92 {
  93         struct ceph_none_authorizer *au;
  94         int ret;
  95
  96         au = kmalloc(sizeof(*au), GFP_NOFS);
  97         if (!au)
  98                 return -ENOMEM;
  99
 100         au->base.destroy = ceph_auth_none_destroy_authorizer;
 101
 102         ret = ceph_auth_none_build_authorizer(ac, au);
 103         if (ret) {
 104                 kfree(au);
 105                 return ret;
 106         }
 107
 108         auth->authorizer = (struct ceph_authorizer *) au;
 109         auth->authorizer_buf = au->buf;
 110         auth->authorizer_buf_len = au->buf_len;
 111         auth->authorizer_reply_buf = au->reply_buf;
 112         auth->authorizer_reply_buf_len = sizeof (au->reply_buf);
 113
 114         return 0;
 115 }
 116
 117 static const struct ceph_auth_client_ops ceph_auth_none_ops = {
 118         .name = "none",
 119         .reset = reset,
 120         .destroy = destroy,
 121         .is_authenticated = is_authenticated,
 122         .should_authenticate = should_authenticate,
 123         .build_request = build_request,
 124         .handle_reply = handle_reply,
 125         .create_authorizer = ceph_auth_none_create_authorizer,
 126 };
 127
 128 int ceph_auth_none_init(struct ceph_auth_client *ac)
 129 {
 130         struct ceph_auth_none_info *xi;
 131
 132         dout("ceph_auth_none_init %p\n", ac);
 133         xi = kzalloc(sizeof(*xi), GFP_NOFS);
 134         if (!xi)
 135                 return -ENOMEM;
 136
 137         xi->starting = true;
 138
 139         ac->protocol = CEPH_AUTH_NONE;
 140         ac->private = xi;
 141         ac->ops = &ceph_auth_none_ops;
 142         return 0;
 143 }
 144