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Linux/net/ceph/auth_none.c

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  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 
 15 static void reset(struct ceph_auth_client *ac)
 16 {
 17         struct ceph_auth_none_info *xi = ac->private;
 18 
 19         xi->starting = true;
 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 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 
 59 e_range:
 60         return -ERANGE;
 61 }
 62 
 63 static 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  */
 72 static 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 
 81 static 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  */
 90 static 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 
118 static 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 
129 int 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 
146 

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