LXR linux/net/ceph/auth

   1// SPDX-License-Identifier: GPL-2.0
   2
   3#include <linux/ceph/ceph_debug.h>
   4
   5#include <linux/err.h>
   6#include <linux/module.h>
   7#include <linux/random.h>
   8#include <linux/slab.h>
   9
  10#include <linux/ceph/decode.h>
  11#include <linux/ceph/auth.h>
  12
  13#include "auth_none.h"
  14
  15static void reset(struct ceph_auth_client *ac)
  16{
  17        struct ceph_auth_none_info *xi = ac->private;
  18
  19        xi->starting = true;
  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 ceph_auth_none_build_authorizer(struct ceph_auth_client *ac,
  43                                           struct ceph_none_authorizer *au)
  44{
  45        void *p = au->buf;
  46        void *const end = p + sizeof(au->buf);
  47        int ret;
  48
  49        ceph_encode_8_safe(&p, end, 1, e_range);
  50        ret = ceph_auth_entity_name_encode(ac->name, &p, end);
  51        if (ret < 0)
  52                return ret;
  53
  54        ceph_encode_64_safe(&p, end, ac->global_id, e_range);
  55        au->buf_len = p - (void *)au->buf;
  56        dout("%s built authorizer len %d\n", __func__, au->buf_len);
  57        return 0;
  58
  59e_range:
  60        return -ERANGE;
  61}
  62
  63static int build_request(struct ceph_auth_client *ac, void *buf, void *end)
  64{
  65        return 0;
  66}
  67
  68/*
  69 * the generic auth code decode the global_id, and we carry no actual
  70 * authenticate state, so nothing happens here.
  71 */
  72static int handle_reply(struct ceph_auth_client *ac, int result,
  73                        void *buf, void *end)
  74{
  75        struct ceph_auth_none_info *xi = ac->private;
  76
  77        xi->starting = false;
  78        return result;
  79}
  80
  81static void ceph_auth_none_destroy_authorizer(struct ceph_authorizer *a)
  82{
  83        kfree(a);
  84}
  85
  86/*
  87 * build an 'authorizer' with our entity_name and global_id.  it is
  88 * identical for all services we connect to.
  89 */
  90static int ceph_auth_none_create_authorizer(
  91        struct ceph_auth_client *ac, int peer_type,
  92        struct ceph_auth_handshake *auth)
  93{
  94        struct ceph_none_authorizer *au;
  95        int ret;
  96
  97        au = kmalloc(sizeof(*au), GFP_NOFS);
  98        if (!au)
  99                return -ENOMEM;
 100
 101        au->base.destroy = ceph_auth_none_destroy_authorizer;
 102
 103        ret = ceph_auth_none_build_authorizer(ac, au);
 104        if (ret) {
 105                kfree(au);
 106                return ret;
 107        }
 108
 109        auth->authorizer = (struct ceph_authorizer *) au;
 110        auth->authorizer_buf = au->buf;
 111        auth->authorizer_buf_len = au->buf_len;
 112        auth->authorizer_reply_buf = au->reply_buf;
 113        auth->authorizer_reply_buf_len = sizeof (au->reply_buf);
 114
 115        return 0;
 116}
 117
 118static const struct ceph_auth_client_ops ceph_auth_none_ops = {
 119        .name = "none",
 120        .reset = reset,
 121        .destroy = destroy,
 122        .is_authenticated = is_authenticated,
 123        .should_authenticate = should_authenticate,
 124        .build_request = build_request,
 125        .handle_reply = handle_reply,
 126        .create_authorizer = ceph_auth_none_create_authorizer,
 127};
 128
 129int ceph_auth_none_init(struct ceph_auth_client *ac)
 130{
 131        struct ceph_auth_none_info *xi;
 132
 133        dout("ceph_auth_none_init %p\n", ac);
 134        xi = kzalloc(sizeof(*xi), GFP_NOFS);
 135        if (!xi)
 136                return -ENOMEM;
 137
 138        xi->starting = true;
 139
 140        ac->protocol = CEPH_AUTH_NONE;
 141        ac->private = xi;
 142        ac->ops = &ceph_auth_none_ops;
 143        return 0;
 144}
 145