1 /* 2 * linux/include/linux/sunrpc/auth.h 3 * 4 * Declarations for the RPC client authentication machinery. 5 * 6 * Copyright (C) 1996, Olaf Kirch <[email protected]> 7 */ 8 9 #ifndef _LINUX_SUNRPC_AUTH_H 10 #define _LINUX_SUNRPC_AUTH_H 11 12 #ifdef __KERNEL__ 13 14 #include <linux/sunrpc/sched.h> 15 #include <linux/sunrpc/msg_prot.h> 16 #include <linux/sunrpc/xdr.h> 17 18 #include <linux/atomic.h> 19 #include <linux/rcupdate.h> 20 #include <linux/uidgid.h> 21 22 /* size of the nodename buffer */ 23 #define UNX_MAXNODENAME 32 24 25 struct rpcsec_gss_info; 26 27 /* auth_cred ac_flags bits */ 28 enum { 29 RPC_CRED_NO_CRKEY_TIMEOUT = 0, /* underlying cred has no key timeout */ 30 RPC_CRED_KEY_EXPIRE_SOON = 1, /* underlying cred key will expire soon */ 31 RPC_CRED_NOTIFY_TIMEOUT = 2, /* nofity generic cred when underlying 32 key will expire soon */ 33 }; 34 35 /* Work around the lack of a VFS credential */ 36 struct auth_cred { 37 kuid_t uid; 38 kgid_t gid; 39 struct group_info *group_info; 40 const char *principal; 41 unsigned long ac_flags; 42 unsigned char machine_cred : 1; 43 }; 44 45 /* 46 * Client user credentials 47 */ 48 struct rpc_auth; 49 struct rpc_credops; 50 struct rpc_cred { 51 struct hlist_node cr_hash; /* hash chain */ 52 struct list_head cr_lru; /* lru garbage collection */ 53 struct rcu_head cr_rcu; 54 struct rpc_auth * cr_auth; 55 const struct rpc_credops *cr_ops; 56 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 57 unsigned long cr_magic; /* 0x0f4aa4f0 */ 58 #endif 59 unsigned long cr_expire; /* when to gc */ 60 unsigned long cr_flags; /* various flags */ 61 atomic_t cr_count; /* ref count */ 62 63 kuid_t cr_uid; 64 65 /* per-flavor data */ 66 }; 67 #define RPCAUTH_CRED_NEW 0 68 #define RPCAUTH_CRED_UPTODATE 1 69 #define RPCAUTH_CRED_HASHED 2 70 #define RPCAUTH_CRED_NEGATIVE 3 71 72 #define RPCAUTH_CRED_MAGIC 0x0f4aa4f0 73 74 /* 75 * Client authentication handle 76 */ 77 struct rpc_cred_cache; 78 struct rpc_authops; 79 struct rpc_auth { 80 unsigned int au_cslack; /* call cred size estimate */ 81 /* guess at number of u32's auth adds before 82 * reply data; normally the verifier size: */ 83 unsigned int au_rslack; 84 /* for gss, used to calculate au_rslack: */ 85 unsigned int au_verfsize; 86 87 unsigned int au_flags; /* various flags */ 88 const struct rpc_authops *au_ops; /* operations */ 89 rpc_authflavor_t au_flavor; /* pseudoflavor (note may 90 * differ from the flavor in 91 * au_ops->au_flavor in gss 92 * case) */ 93 atomic_t au_count; /* Reference counter */ 94 95 struct rpc_cred_cache * au_credcache; 96 /* per-flavor data */ 97 }; 98 99 struct rpc_auth_create_args { 100 rpc_authflavor_t pseudoflavor; 101 const char *target_name; 102 }; 103 104 /* Flags for rpcauth_lookupcred() */ 105 #define RPCAUTH_LOOKUP_NEW 0x01 /* Accept an uninitialised cred */ 106 #define RPCAUTH_LOOKUP_RCU 0x02 /* lock-less lookup */ 107 108 /* 109 * Client authentication ops 110 */ 111 struct rpc_authops { 112 struct module *owner; 113 rpc_authflavor_t au_flavor; /* flavor (RPC_AUTH_*) */ 114 char * au_name; 115 struct rpc_auth * (*create)(struct rpc_auth_create_args *, struct rpc_clnt *); 116 void (*destroy)(struct rpc_auth *); 117 118 struct rpc_cred * (*lookup_cred)(struct rpc_auth *, struct auth_cred *, int); 119 struct rpc_cred * (*crcreate)(struct rpc_auth*, struct auth_cred *, int); 120 int (*list_pseudoflavors)(rpc_authflavor_t *, int); 121 rpc_authflavor_t (*info2flavor)(struct rpcsec_gss_info *); 122 int (*flavor2info)(rpc_authflavor_t, 123 struct rpcsec_gss_info *); 124 int (*key_timeout)(struct rpc_auth *, 125 struct rpc_cred *); 126 }; 127 128 struct rpc_credops { 129 const char * cr_name; /* Name of the auth flavour */ 130 int (*cr_init)(struct rpc_auth *, struct rpc_cred *); 131 void (*crdestroy)(struct rpc_cred *); 132 133 int (*crmatch)(struct auth_cred *, struct rpc_cred *, int); 134 struct rpc_cred * (*crbind)(struct rpc_task *, struct rpc_cred *, int); 135 __be32 * (*crmarshal)(struct rpc_task *, __be32 *); 136 int (*crrefresh)(struct rpc_task *); 137 __be32 * (*crvalidate)(struct rpc_task *, __be32 *); 138 int (*crwrap_req)(struct rpc_task *, kxdreproc_t, 139 void *, __be32 *, void *); 140 int (*crunwrap_resp)(struct rpc_task *, kxdrdproc_t, 141 void *, __be32 *, void *); 142 int (*crkey_timeout)(struct rpc_cred *); 143 bool (*crkey_to_expire)(struct rpc_cred *); 144 char * (*crstringify_acceptor)(struct rpc_cred *); 145 }; 146 147 extern const struct rpc_authops authunix_ops; 148 extern const struct rpc_authops authnull_ops; 149 150 int __init rpc_init_authunix(void); 151 int __init rpc_init_generic_auth(void); 152 int __init rpcauth_init_module(void); 153 void rpcauth_remove_module(void); 154 void rpc_destroy_generic_auth(void); 155 void rpc_destroy_authunix(void); 156 157 struct rpc_cred * rpc_lookup_cred(void); 158 struct rpc_cred * rpc_lookup_cred_nonblock(void); 159 struct rpc_cred * rpc_lookup_machine_cred(const char *service_name); 160 int rpcauth_register(const struct rpc_authops *); 161 int rpcauth_unregister(const struct rpc_authops *); 162 struct rpc_auth * rpcauth_create(struct rpc_auth_create_args *, 163 struct rpc_clnt *); 164 void rpcauth_release(struct rpc_auth *); 165 rpc_authflavor_t rpcauth_get_pseudoflavor(rpc_authflavor_t, 166 struct rpcsec_gss_info *); 167 int rpcauth_get_gssinfo(rpc_authflavor_t, 168 struct rpcsec_gss_info *); 169 int rpcauth_list_flavors(rpc_authflavor_t *, int); 170 struct rpc_cred * rpcauth_lookup_credcache(struct rpc_auth *, struct auth_cred *, int); 171 void rpcauth_init_cred(struct rpc_cred *, const struct auth_cred *, struct rpc_auth *, const struct rpc_credops *); 172 struct rpc_cred * rpcauth_lookupcred(struct rpc_auth *, int); 173 struct rpc_cred * rpcauth_generic_bind_cred(struct rpc_task *, struct rpc_cred *, int); 174 void put_rpccred(struct rpc_cred *); 175 __be32 * rpcauth_marshcred(struct rpc_task *, __be32 *); 176 __be32 * rpcauth_checkverf(struct rpc_task *, __be32 *); 177 int rpcauth_wrap_req(struct rpc_task *task, kxdreproc_t encode, void *rqstp, __be32 *data, void *obj); 178 int rpcauth_unwrap_resp(struct rpc_task *task, kxdrdproc_t decode, void *rqstp, __be32 *data, void *obj); 179 int rpcauth_refreshcred(struct rpc_task *); 180 void rpcauth_invalcred(struct rpc_task *); 181 int rpcauth_uptodatecred(struct rpc_task *); 182 int rpcauth_init_credcache(struct rpc_auth *); 183 void rpcauth_destroy_credcache(struct rpc_auth *); 184 void rpcauth_clear_credcache(struct rpc_cred_cache *); 185 int rpcauth_key_timeout_notify(struct rpc_auth *, 186 struct rpc_cred *); 187 bool rpcauth_cred_key_to_expire(struct rpc_cred *); 188 char * rpcauth_stringify_acceptor(struct rpc_cred *); 189 190 static inline 191 struct rpc_cred * get_rpccred(struct rpc_cred *cred) 192 { 193 atomic_inc(&cred->cr_count); 194 return cred; 195 } 196 197 #endif /* __KERNEL__ */ 198 #endif /* _LINUX_SUNRPC_AUTH_H */ 199