root/include/linux/ceph/auth.h

INCLUDED FROM

DEFINITIONS

1. ceph_auth_sign_message
2. ceph_auth_check_message_signature

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _FS_CEPH_AUTH_H
   3 #define _FS_CEPH_AUTH_H
   4 
   5 #include <linux/ceph/types.h>
   6 #include <linux/ceph/buffer.h>
   7 
   8 /*
   9  * Abstract interface for communicating with the authenticate module.
  10  * There is some handshake that takes place between us and the monitor
  11  * to acquire the necessary keys.  These are used to generate an
  12  * 'authorizer' that we use when connecting to a service (mds, osd).
  13  */
  14 
  15 struct ceph_auth_client;
  16 struct ceph_msg;
  17 
  18 struct ceph_authorizer {
  19         void (*destroy)(struct ceph_authorizer *);
  20 };
  21 
  22 struct ceph_auth_handshake {
  23         struct ceph_authorizer *authorizer;
  24         void *authorizer_buf;
  25         size_t authorizer_buf_len;
  26         void *authorizer_reply_buf;
  27         size_t authorizer_reply_buf_len;
  28         int (*sign_message)(struct ceph_auth_handshake *auth,
  29                             struct ceph_msg *msg);
  30         int (*check_message_signature)(struct ceph_auth_handshake *auth,
  31                                        struct ceph_msg *msg);
  32 };
  33 
  34 struct ceph_auth_client_ops {
  35         const char *name;
  36 
  37         /*
  38          * true if we are authenticated and can connect to
  39          * services.
  40          */
  41         int (*is_authenticated)(struct ceph_auth_client *ac);
  42 
  43         /*
  44          * true if we should (re)authenticate, e.g., when our tickets
  45          * are getting old and crusty.
  46          */
  47         int (*should_authenticate)(struct ceph_auth_client *ac);
  48 
  49         /*
  50          * build requests and process replies during monitor
  51          * handshake.  if handle_reply returns -EAGAIN, we build
  52          * another request.
  53          */
  54         int (*build_request)(struct ceph_auth_client *ac, void *buf, void *end);
  55         int (*handle_reply)(struct ceph_auth_client *ac, int result,
  56                             void *buf, void *end);
  57 
  58         /*
  59          * Create authorizer for connecting to a service, and verify
  60          * the response to authenticate the service.
  61          */
  62         int (*create_authorizer)(struct ceph_auth_client *ac, int peer_type,
  63                                  struct ceph_auth_handshake *auth);
  64         /* ensure that an existing authorizer is up to date */
  65         int (*update_authorizer)(struct ceph_auth_client *ac, int peer_type,
  66                                  struct ceph_auth_handshake *auth);
  67         int (*add_authorizer_challenge)(struct ceph_auth_client *ac,
  68                                         struct ceph_authorizer *a,
  69                                         void *challenge_buf,
  70                                         int challenge_buf_len);
  71         int (*verify_authorizer_reply)(struct ceph_auth_client *ac,
  72                                        struct ceph_authorizer *a);
  73         void (*invalidate_authorizer)(struct ceph_auth_client *ac,
  74                                       int peer_type);
  75 
  76         /* reset when we (re)connect to a monitor */
  77         void (*reset)(struct ceph_auth_client *ac);
  78 
  79         void (*destroy)(struct ceph_auth_client *ac);
  80 
  81         int (*sign_message)(struct ceph_auth_handshake *auth,
  82                             struct ceph_msg *msg);
  83         int (*check_message_signature)(struct ceph_auth_handshake *auth,
  84                                        struct ceph_msg *msg);
  85 };
  86 
  87 struct ceph_auth_client {
  88         u32 protocol;           /* CEPH_AUTH_* */
  89         void *private;          /* for use by protocol implementation */
  90         const struct ceph_auth_client_ops *ops;  /* null iff protocol==0 */
  91 
  92         bool negotiating;       /* true if negotiating protocol */
  93         const char *name;       /* entity name */
  94         u64 global_id;          /* our unique id in system */
  95         const struct ceph_crypto_key *key;     /* our secret key */
  96         unsigned want_keys;     /* which services we want */
  97 
  98         struct mutex mutex;
  99 };
 100 
 101 extern struct ceph_auth_client *ceph_auth_init(const char *name,
 102                                                const struct ceph_crypto_key *key);
 103 extern void ceph_auth_destroy(struct ceph_auth_client *ac);
 104 
 105 extern void ceph_auth_reset(struct ceph_auth_client *ac);
 106 
 107 extern int ceph_auth_build_hello(struct ceph_auth_client *ac,
 108                                  void *buf, size_t len);
 109 extern int ceph_handle_auth_reply(struct ceph_auth_client *ac,
 110                                   void *buf, size_t len,
 111                                   void *reply_buf, size_t reply_len);
 112 int ceph_auth_entity_name_encode(const char *name, void **p, void *end);
 113 
 114 extern int ceph_build_auth(struct ceph_auth_client *ac,
 115                     void *msg_buf, size_t msg_len);
 116 
 117 extern int ceph_auth_is_authenticated(struct ceph_auth_client *ac);
 118 extern int ceph_auth_create_authorizer(struct ceph_auth_client *ac,
 119                                        int peer_type,
 120                                        struct ceph_auth_handshake *auth);
 121 void ceph_auth_destroy_authorizer(struct ceph_authorizer *a);
 122 extern int ceph_auth_update_authorizer(struct ceph_auth_client *ac,
 123                                        int peer_type,
 124                                        struct ceph_auth_handshake *a);
 125 int ceph_auth_add_authorizer_challenge(struct ceph_auth_client *ac,
 126                                        struct ceph_authorizer *a,
 127                                        void *challenge_buf,
 128                                        int challenge_buf_len);
 129 extern int ceph_auth_verify_authorizer_reply(struct ceph_auth_client *ac,
 130                                              struct ceph_authorizer *a);
 131 extern void ceph_auth_invalidate_authorizer(struct ceph_auth_client *ac,
 132                                             int peer_type);
 133 
 134 static inline int ceph_auth_sign_message(struct ceph_auth_handshake *auth,
 135                                          struct ceph_msg *msg)
 136 {
 137         if (auth->sign_message)
 138                 return auth->sign_message(auth, msg);
 139         return 0;
 140 }
 141 
 142 static inline
 143 int ceph_auth_check_message_signature(struct ceph_auth_handshake *auth,
 144                                       struct ceph_msg *msg)
 145 {
 146         if (auth->check_message_signature)
 147                 return auth->check_message_signature(auth, msg);
 148         return 0;
 149 }
 150 #endif