include/linux/ceph/auth.h

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