| 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 | int ceph_auth_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 |