2 * linux/include/linux/sunrpc/svcauth.h
4 * RPC server-side authentication stuff.
6 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
9 #ifndef _LINUX_SUNRPC_SVCAUTH_H_
10 #define _LINUX_SUNRPC_SVCAUTH_H_
14 #include <linux/string.h>
15 #include <linux/sunrpc/msg_prot.h>
16 #include <linux/sunrpc/cache.h>
17 #include <linux/hash.h>
18 #include <linux/cred.h>
23 struct group_info *cr_group_info;
24 char *cr_principal; /* for gss */
27 static inline void free_svc_cred(struct svc_cred *cred)
29 if (cred->cr_group_info)
30 put_group_info(cred->cr_group_info);
31 kfree(cred->cr_principal);
34 struct svc_rqst; /* forward decl */
37 /* Authentication is done in the context of a domain.
39 * Currently, the nfs server uses the auth_domain to stand
40 * for the "client" listed in /etc/exports.
42 * More generally, a domain might represent a group of clients using
43 * a common mechanism for authentication and having a common mapping
44 * between local identity (uid) and network identity. All clients
45 * in a domain have similar general access rights. Each domain can
46 * contain multiple principals which will have different specific right
47 * based on normal Discretionary Access Control.
49 * A domain is created by an authentication flavour module based on name
50 * only. Userspace then fills in detail on demand.
52 * In the case of auth_unix and auth_null, the auth_domain is also
53 * associated with entries in another cache representing the mapping
54 * of ip addresses to the given client.
58 struct hlist_node hash;
60 struct auth_ops *flavour;
64 * Each authentication flavour registers an auth_ops
66 * name is simply the name.
67 * flavour gives the auth flavour. It determines where the flavour is registered
68 * accept() is given a request and should verify it.
69 * It should inspect the authenticator and verifier, and possibly the data.
70 * If there is a problem with the authentication *authp should be set.
71 * The return value of accept() can indicate:
72 * OK - authorised. client and credential are set in rqstp.
73 * reqbuf points to arguments
74 * resbuf points to good place for results. verfier
75 * is (probably) already in place. Certainly space is
77 * DROP - simply drop the request. It may have been deferred
78 * GARBAGE - rpc garbage_args error
79 * SYSERR - rpc system_err error
80 * DENIED - authp holds reason for denial.
81 * COMPLETE - the reply is encoded already and ready to be sent; no
82 * further processing is necessary. (This is used for processing
83 * null procedure calls which are used to set up encryption
86 * accept is passed the proc number so that it can accept NULL rpc requests
87 * even if it cannot authenticate the client (as is sometimes appropriate).
89 * release() is given a request after the procedure has been run.
90 * It should sign/encrypt the results if needed
92 * OK - the resbuf is ready to be sent
93 * DROP - the reply should be quitely dropped
94 * DENIED - authp holds a reason for MSG_DENIED
95 * SYSERR - rpc system_err
98 * This call releases a domain.
100 * Givens a pending request (struct svc_rqst), finds and assigns
101 * an appropriate 'auth_domain' as the client.
105 struct module *owner;
107 int (*accept)(struct svc_rqst *rq, __be32 *authp);
108 int (*release)(struct svc_rqst *rq);
109 void (*domain_release)(struct auth_domain *);
110 int (*set_client)(struct svc_rqst *rq);
113 #define SVC_GARBAGE 1
116 #define SVC_NEGATIVE 4
119 #define SVC_CLOSE 7 /* Like SVC_DROP, but request is definitely
120 * lost so if there is a tcp connection, it
124 #define SVC_PENDING 9
125 #define SVC_COMPLETE 10
129 extern int svc_authenticate(struct svc_rqst *rqstp, __be32 *authp);
130 extern int svc_authorise(struct svc_rqst *rqstp);
131 extern int svc_set_client(struct svc_rqst *rqstp);
132 extern int svc_auth_register(rpc_authflavor_t flavor, struct auth_ops *aops);
133 extern void svc_auth_unregister(rpc_authflavor_t flavor);
135 extern struct auth_domain *unix_domain_find(char *name);
136 extern void auth_domain_put(struct auth_domain *item);
137 extern int auth_unix_add_addr(struct net *net, struct in6_addr *addr, struct auth_domain *dom);
138 extern struct auth_domain *auth_domain_lookup(char *name, struct auth_domain *new);
139 extern struct auth_domain *auth_domain_find(char *name);
140 extern struct auth_domain *auth_unix_lookup(struct net *net, struct in6_addr *addr);
141 extern int auth_unix_forget_old(struct auth_domain *dom);
142 extern void svcauth_unix_purge(struct net *net);
143 extern void svcauth_unix_info_release(struct svc_xprt *xpt);
144 extern int svcauth_unix_set_client(struct svc_rqst *rqstp);
146 extern int unix_gid_cache_create(struct net *net);
147 extern void unix_gid_cache_destroy(struct net *net);
149 static inline unsigned long hash_str(char *name, int bits)
151 unsigned long hash = 0;
156 if (unlikely(!(c = *name++))) {
157 c = (char)len; len = -1;
161 if ((len & (BITS_PER_LONG/8-1))==0)
162 hash = hash_long(hash^l, BITS_PER_LONG);
164 return hash >> (BITS_PER_LONG - bits);
167 static inline unsigned long hash_mem(char *buf, int length, int bits)
169 unsigned long hash = 0;
175 c = (char)len; len = -1;
180 if ((len & (BITS_PER_LONG/8-1))==0)
181 hash = hash_long(hash^l, BITS_PER_LONG);
183 return hash >> (BITS_PER_LONG - bits);
186 #endif /* __KERNEL__ */
188 #endif /* _LINUX_SUNRPC_SVCAUTH_H_ */