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/* SPDX-License-Identifier: GPL-2.0 */
/*
* linux/include/linux/sunrpc/auth.h
*
* Declarations for the RPC client authentication machinery.
*
* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
*/
#ifndef _LINUX_SUNRPC_AUTH_H
#define _LINUX_SUNRPC_AUTH_H
#include <linux/sunrpc/sched.h>
#include <linux/sunrpc/msg_prot.h>
#include <linux/sunrpc/xdr.h>
#include <linux/atomic.h>
#include <linux/rcupdate.h>
#include <linux/uidgid.h>
#include <linux/utsname.h>
/*
* Maximum size of AUTH_NONE authentication information, in XDR words.
*/
#define NUL_CALLSLACK (4)
#define NUL_REPLYSLACK (2)
/*
* Size of the nodename buffer. RFC1831 specifies a hard limit of 255 bytes,
* but Linux hostnames are actually limited to __NEW_UTS_LEN bytes.
*/
#define UNX_MAXNODENAME __NEW_UTS_LEN
#define UNX_CALLSLACK (21 + XDR_QUADLEN(UNX_MAXNODENAME))
#define UNX_NGROUPS 16
struct rpcsec_gss_info;
struct auth_cred {
const struct cred *cred;
const char *principal; /* If present, this is a machine credential */
};
/*
* Client user credentials
*/
struct rpc_auth;
struct rpc_credops;
struct rpc_cred {
struct hlist_node cr_hash; /* hash chain */
struct list_head cr_lru; /* lru garbage collection */
struct rcu_head cr_rcu;
struct rpc_auth * cr_auth;
const struct rpc_credops *cr_ops;
unsigned long cr_expire; /* when to gc */
unsigned long cr_flags; /* various flags */
refcount_t cr_count; /* ref count */
const struct cred *cr_cred;
/* per-flavor data */
};
#define RPCAUTH_CRED_NEW 0
#define RPCAUTH_CRED_UPTODATE 1
#define RPCAUTH_CRED_HASHED 2
#define RPCAUTH_CRED_NEGATIVE 3
const struct cred *rpc_machine_cred(void);
/*
* Client authentication handle
*/
struct rpc_cred_cache;
struct rpc_authops;
struct rpc_auth {
unsigned int au_cslack; /* call cred size estimate */
unsigned int au_rslack; /* reply cred size estimate */
unsigned int au_verfsize; /* size of reply verifier */
unsigned int au_ralign; /* words before UL header */
unsigned long au_flags;
const struct rpc_authops *au_ops;
rpc_authflavor_t au_flavor; /* pseudoflavor (note may
* differ from the flavor in
* au_ops->au_flavor in gss
* case) */
refcount_t au_count; /* Reference counter */
struct rpc_cred_cache * au_credcache;
/* per-flavor data */
};
/* rpc_auth au_flags */
#define RPCAUTH_AUTH_DATATOUCH (1)
#define RPCAUTH_AUTH_UPDATE_SLACK (2)
struct rpc_auth_create_args {
rpc_authflavor_t pseudoflavor;
const char *target_name;
};
/* Flags for rpcauth_lookupcred() */
#define RPCAUTH_LOOKUP_NEW 0x01 /* Accept an uninitialised cred */
#define RPCAUTH_LOOKUP_ASYNC 0x02 /* Don't block waiting for memory */
/*
* Client authentication ops
*/
struct rpc_authops {
struct module *owner;
rpc_authflavor_t au_flavor; /* flavor (RPC_AUTH_*) */
char * au_name;
struct rpc_auth * (*create)(const struct rpc_auth_create_args *,
struct rpc_clnt *);
void (*destroy)(struct rpc_auth *);
int (*hash_cred)(struct auth_cred *, unsigned int);
struct rpc_cred * (*lookup_cred)(struct rpc_auth *, struct auth_cred *, int);
struct rpc_cred * (*crcreate)(struct rpc_auth*, struct auth_cred *, int, gfp_t);
rpc_authflavor_t (*info2flavor)(struct rpcsec_gss_info *);
int (*flavor2info)(rpc_authflavor_t,
struct rpcsec_gss_info *);
int (*key_timeout)(struct rpc_auth *,
struct rpc_cred *);
};
struct rpc_credops {
const char * cr_name; /* Name of the auth flavour */
int (*cr_init)(struct rpc_auth *, struct rpc_cred *);
void (*crdestroy)(struct rpc_cred *);
int (*crmatch)(struct auth_cred *, struct rpc_cred *, int);
int (*crmarshal)(struct rpc_task *task,
struct xdr_stream *xdr);
int (*crrefresh)(struct rpc_task *);
int (*crvalidate)(struct rpc_task *task,
struct xdr_stream *xdr);
int (*crwrap_req)(struct rpc_task *task,
struct xdr_stream *xdr);
int (*crunwrap_resp)(struct rpc_task *task,
struct xdr_stream *xdr);
int (*crkey_timeout)(struct rpc_cred *);
char * (*crstringify_acceptor)(struct rpc_cred *);
bool (*crneed_reencode)(struct rpc_task *);
};
extern const struct rpc_authops authunix_ops;
extern const struct rpc_authops authnull_ops;
int __init rpc_init_authunix(void);
int __init rpcauth_init_module(void);
void rpcauth_remove_module(void);
void rpc_destroy_authunix(void);
int rpcauth_register(const struct rpc_authops *);
int rpcauth_unregister(const struct rpc_authops *);
struct rpc_auth * rpcauth_create(const struct rpc_auth_create_args *,
struct rpc_clnt *);
void rpcauth_release(struct rpc_auth *);
rpc_authflavor_t rpcauth_get_pseudoflavor(rpc_authflavor_t,
struct rpcsec_gss_info *);
int rpcauth_get_gssinfo(rpc_authflavor_t,
struct rpcsec_gss_info *);
struct rpc_cred * rpcauth_lookup_credcache(struct rpc_auth *, struct auth_cred *, int, gfp_t);
void rpcauth_init_cred(struct rpc_cred *, const struct auth_cred *, struct rpc_auth *, const struct rpc_credops *);
struct rpc_cred * rpcauth_lookupcred(struct rpc_auth *, int);
void put_rpccred(struct rpc_cred *);
int rpcauth_marshcred(struct rpc_task *task,
struct xdr_stream *xdr);
int rpcauth_checkverf(struct rpc_task *task,
struct xdr_stream *xdr);
int rpcauth_wrap_req_encode(struct rpc_task *task,
struct xdr_stream *xdr);
int rpcauth_wrap_req(struct rpc_task *task,
struct xdr_stream *xdr);
int rpcauth_unwrap_resp_decode(struct rpc_task *task,
struct xdr_stream *xdr);
int rpcauth_unwrap_resp(struct rpc_task *task,
struct xdr_stream *xdr);
bool rpcauth_xmit_need_reencode(struct rpc_task *task);
int rpcauth_refreshcred(struct rpc_task *);
void rpcauth_invalcred(struct rpc_task *);
int rpcauth_uptodatecred(struct rpc_task *);
int rpcauth_init_credcache(struct rpc_auth *);
void rpcauth_destroy_credcache(struct rpc_auth *);
void rpcauth_clear_credcache(struct rpc_cred_cache *);
char * rpcauth_stringify_acceptor(struct rpc_cred *);
static inline
struct rpc_cred *get_rpccred(struct rpc_cred *cred)
{
if (cred != NULL && refcount_inc_not_zero(&cred->cr_count))
return cred;
return NULL;
}
#endif /* _LINUX_SUNRPC_AUTH_H */
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