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>
22 gid_t cr_groups[NGROUPS];
25 struct svc_rqst; /* forward decl */
27 /* Authentication is done in the context of a domain.
28 * For a server, a domain represents a group of clients using
29 * a common mechanism for authentication and having a common mapping
30 * between local identity (uid) and network identity. All clients
31 * in a domain have similar general access rights. Each domain can
32 * contain multiple principals which will have different specific right
33 * based on normal Discretionary Access Control.
35 * For a client, a domain represents a number of servers which all
36 * use a common authentication mechanism and network identity name space.
38 * A domain is created by an authentication flavour module based on name
39 * only. Userspace then fills in detail on demand.
41 * The creation of a domain typically implies creation of one or
42 * more caches for storing domain specific information.
51 * Each authentication flavour registers an auth_ops
53 * name is simply the name.
54 * flavour gives the auth flavour. It determines where the flavour is registered
55 * accept() is given a request and should verify it.
56 * It should inspect the authenticator and verifier, and possibly the data.
57 * If there is a problem with the authentication *authp should be set.
58 * The return value of accept() can indicate:
59 * OK - authorised. client and credential are set in rqstp.
60 * reqbuf points to arguments
61 * resbuf points to good place for results. verfier
62 * is (probably) already in place. Certainly space is
64 * DROP - simply drop the request. It may have been deferred
65 * GARBAGE - rpc garbage_args error
66 * SYSERR - rpc system_err error
67 * DENIED - authp holds reason for denial.
69 * accept is passed the proc number so that it can accept NULL rpc requests
70 * even if it cannot authenticate the client (as is sometimes appropriate).
72 * release() is given a request after the procedure has been run.
73 * It should sign/encrypt the results if needed
75 * OK - the resbuf is ready to be sent
76 * DROP - the reply should be quitely dropped
77 * DENIED - authp holds a reason for MSG_DENIED
78 * SYSERR - rpc system_err
81 * This call releases a domain.
86 int (*accept)(struct svc_rqst *rq, u32 *authp);
87 int (*release)(struct svc_rqst *rq);
88 void (*domain_release)(struct auth_domain *);
90 extern struct auth_ops *authtab[RPC_AUTH_MAXFLAVOR];
95 #define SVC_NEGATIVE 4
102 extern int svc_authenticate(struct svc_rqst *rqstp, u32 *authp);
103 extern int svc_authorise(struct svc_rqst *rqstp);
104 extern int svc_auth_register(rpc_authflavor_t flavor, struct auth_ops *aops);
105 extern void svc_auth_unregister(rpc_authflavor_t flavor);
107 extern struct auth_domain *unix_domain_find(char *name);
108 extern void auth_domain_put(struct auth_domain *item);
109 extern int auth_unix_add_addr(struct in_addr addr, struct auth_domain *dom);
110 extern struct auth_domain *auth_domain_lookup(struct auth_domain *item, int set);
111 extern struct auth_domain *auth_domain_find(char *name);
112 extern struct auth_domain *auth_unix_lookup(struct in_addr addr);
113 extern int auth_unix_forget_old(struct auth_domain *dom);
114 extern void svcauth_unix_purge(void);
116 static inline unsigned long hash_str(char *name, int bits)
118 unsigned long hash = 0;
123 if (unlikely(!(c = *name++))) {
124 c = (char)len; len = -1;
128 if ((len & (BITS_PER_LONG/8-1))==0)
129 hash = hash_long(hash^l, BITS_PER_LONG);
131 return hash >> (BITS_PER_LONG - bits);
134 static inline unsigned long hash_mem(char *buf, int length, int bits)
136 unsigned long hash = 0;
142 c = (char)len; len = -1;
147 if ((len & (BITS_PER_LONG/8-1))==0)
148 hash = hash_long(hash^l, BITS_PER_LONG);
150 return hash >> (BITS_PER_LONG - bits);
153 extern struct cache_detail auth_domain_cache, ip_map_cache;
155 #endif /* __KERNEL__ */
157 #endif /* _LINUX_SUNRPC_SVCAUTH_H_ */