191 lines
6.2 KiB
C
191 lines
6.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* linux/include/linux/sunrpc/svcauth.h
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*
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* RPC server-side authentication stuff.
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*
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* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
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*/
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#ifndef _LINUX_SUNRPC_SVCAUTH_H_
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#define _LINUX_SUNRPC_SVCAUTH_H_
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#ifdef __KERNEL__
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#include <linux/string.h>
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#include <linux/sunrpc/msg_prot.h>
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#include <linux/sunrpc/cache.h>
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#include <linux/sunrpc/gss_api.h>
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#include <linux/hash.h>
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#include <linux/stringhash.h>
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#include <linux/cred.h>
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struct svc_cred {
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kuid_t cr_uid;
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kgid_t cr_gid;
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struct group_info *cr_group_info;
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u32 cr_flavor; /* pseudoflavor */
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/* name of form servicetype/hostname@REALM, passed down by
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* gss-proxy: */
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char *cr_raw_principal;
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/* name of form servicetype@hostname, passed down by
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* rpc.svcgssd, or computed from the above: */
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char *cr_principal;
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char *cr_targ_princ;
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struct gss_api_mech *cr_gss_mech;
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};
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static inline void init_svc_cred(struct svc_cred *cred)
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{
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cred->cr_group_info = NULL;
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cred->cr_raw_principal = NULL;
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cred->cr_principal = NULL;
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cred->cr_targ_princ = NULL;
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cred->cr_gss_mech = NULL;
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}
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static inline void free_svc_cred(struct svc_cred *cred)
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{
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if (cred->cr_group_info)
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put_group_info(cred->cr_group_info);
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kfree(cred->cr_raw_principal);
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kfree(cred->cr_principal);
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kfree(cred->cr_targ_princ);
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gss_mech_put(cred->cr_gss_mech);
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init_svc_cred(cred);
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}
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struct svc_rqst; /* forward decl */
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struct in6_addr;
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/* Authentication is done in the context of a domain.
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*
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* Currently, the nfs server uses the auth_domain to stand
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* for the "client" listed in /etc/exports.
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*
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* More generally, a domain might represent a group of clients using
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* a common mechanism for authentication and having a common mapping
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* between local identity (uid) and network identity. All clients
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* in a domain have similar general access rights. Each domain can
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* contain multiple principals which will have different specific right
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* based on normal Discretionary Access Control.
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*
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* A domain is created by an authentication flavour module based on name
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* only. Userspace then fills in detail on demand.
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*
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* In the case of auth_unix and auth_null, the auth_domain is also
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* associated with entries in another cache representing the mapping
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* of ip addresses to the given client.
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*/
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struct auth_domain {
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struct kref ref;
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struct hlist_node hash;
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char *name;
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struct auth_ops *flavour;
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struct rcu_head rcu_head;
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};
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/*
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* Each authentication flavour registers an auth_ops
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* structure.
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* name is simply the name.
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* flavour gives the auth flavour. It determines where the flavour is registered
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* accept() is given a request and should verify it.
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* It should inspect the authenticator and verifier, and possibly the data.
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* If there is a problem with the authentication *authp should be set.
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* The return value of accept() can indicate:
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* OK - authorised. client and credential are set in rqstp.
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* reqbuf points to arguments
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* resbuf points to good place for results. verfier
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* is (probably) already in place. Certainly space is
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* reserved for it.
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* DROP - simply drop the request. It may have been deferred
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* GARBAGE - rpc garbage_args error
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* SYSERR - rpc system_err error
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* DENIED - authp holds reason for denial.
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* COMPLETE - the reply is encoded already and ready to be sent; no
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* further processing is necessary. (This is used for processing
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* null procedure calls which are used to set up encryption
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* contexts.)
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*
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* accept is passed the proc number so that it can accept NULL rpc requests
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* even if it cannot authenticate the client (as is sometimes appropriate).
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*
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* release() is given a request after the procedure has been run.
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* It should sign/encrypt the results if needed
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* It should return:
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* OK - the resbuf is ready to be sent
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* DROP - the reply should be quitely dropped
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* DENIED - authp holds a reason for MSG_DENIED
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* SYSERR - rpc system_err
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*
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* domain_release()
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* This call releases a domain.
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* set_client()
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* Givens a pending request (struct svc_rqst), finds and assigns
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* an appropriate 'auth_domain' as the client.
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*/
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struct auth_ops {
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char * name;
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struct module *owner;
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int flavour;
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int (*accept)(struct svc_rqst *rq, __be32 *authp);
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int (*release)(struct svc_rqst *rq);
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void (*domain_release)(struct auth_domain *);
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int (*set_client)(struct svc_rqst *rq);
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};
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#define SVC_GARBAGE 1
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#define SVC_SYSERR 2
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#define SVC_VALID 3
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#define SVC_NEGATIVE 4
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#define SVC_OK 5
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#define SVC_DROP 6
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#define SVC_CLOSE 7 /* Like SVC_DROP, but request is definitely
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* lost so if there is a tcp connection, it
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* should be closed
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*/
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#define SVC_DENIED 8
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#define SVC_PENDING 9
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#define SVC_COMPLETE 10
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struct svc_xprt;
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extern int svc_authenticate(struct svc_rqst *rqstp, __be32 *authp);
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extern int svc_authorise(struct svc_rqst *rqstp);
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extern int svc_set_client(struct svc_rqst *rqstp);
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extern int svc_auth_register(rpc_authflavor_t flavor, struct auth_ops *aops);
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extern void svc_auth_unregister(rpc_authflavor_t flavor);
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extern struct auth_domain *unix_domain_find(char *name);
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extern void auth_domain_put(struct auth_domain *item);
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extern int auth_unix_add_addr(struct net *net, struct in6_addr *addr, struct auth_domain *dom);
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extern struct auth_domain *auth_domain_lookup(char *name, struct auth_domain *new);
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extern struct auth_domain *auth_domain_find(char *name);
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extern struct auth_domain *auth_unix_lookup(struct net *net, struct in6_addr *addr);
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extern int auth_unix_forget_old(struct auth_domain *dom);
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extern void svcauth_unix_purge(struct net *net);
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extern void svcauth_unix_info_release(struct svc_xprt *xpt);
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extern int svcauth_unix_set_client(struct svc_rqst *rqstp);
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extern int unix_gid_cache_create(struct net *net);
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extern void unix_gid_cache_destroy(struct net *net);
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/*
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* The <stringhash.h> functions are good enough that we don't need to
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* use hash_32() on them; just extracting the high bits is enough.
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*/
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static inline unsigned long hash_str(char const *name, int bits)
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{
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return hashlen_hash(hashlen_string(NULL, name)) >> (32 - bits);
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}
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static inline unsigned long hash_mem(char const *buf, int length, int bits)
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{
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return full_name_hash(NULL, buf, length) >> (32 - bits);
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}
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#endif /* __KERNEL__ */
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#endif /* _LINUX_SUNRPC_SVCAUTH_H_ */
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