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 u32 cr_flavor; /* pseudoflavor */
25 char *cr_principal; /* for gss */
28 static inline void init_svc_cred(struct svc_cred *cred)
30 cred->cr_group_info = NULL;
31 cred->cr_principal = NULL;
32 cred->cr_gss_mech = NULL;
35 static inline void free_svc_cred(struct svc_cred *cred)
37 if (cred->cr_group_info)
38 put_group_info(cred->cr_group_info);
39 kfree(cred->cr_principal);
42 struct svc_rqst; /* forward decl */
45 /* Authentication is done in the context of a domain.
47 * Currently, the nfs server uses the auth_domain to stand
48 * for the "client" listed in /etc/exports.
50 * More generally, a domain might represent a group of clients using
51 * a common mechanism for authentication and having a common mapping
52 * between local identity (uid) and network identity. All clients
53 * in a domain have similar general access rights. Each domain can
54 * contain multiple principals which will have different specific right
55 * based on normal Discretionary Access Control.
57 * A domain is created by an authentication flavour module based on name
58 * only. Userspace then fills in detail on demand.
60 * In the case of auth_unix and auth_null, the auth_domain is also
61 * associated with entries in another cache representing the mapping
62 * of ip addresses to the given client.
66 struct hlist_node hash;
68 struct auth_ops *flavour;
72 * Each authentication flavour registers an auth_ops
74 * name is simply the name.
75 * flavour gives the auth flavour. It determines where the flavour is registered
76 * accept() is given a request and should verify it.
77 * It should inspect the authenticator and verifier, and possibly the data.
78 * If there is a problem with the authentication *authp should be set.
79 * The return value of accept() can indicate:
80 * OK - authorised. client and credential are set in rqstp.
81 * reqbuf points to arguments
82 * resbuf points to good place for results. verfier
83 * is (probably) already in place. Certainly space is
85 * DROP - simply drop the request. It may have been deferred
86 * GARBAGE - rpc garbage_args error
87 * SYSERR - rpc system_err error
88 * DENIED - authp holds reason for denial.
89 * COMPLETE - the reply is encoded already and ready to be sent; no
90 * further processing is necessary. (This is used for processing
91 * null procedure calls which are used to set up encryption
94 * accept is passed the proc number so that it can accept NULL rpc requests
95 * even if it cannot authenticate the client (as is sometimes appropriate).
97 * release() is given a request after the procedure has been run.
98 * It should sign/encrypt the results if needed
100 * OK - the resbuf is ready to be sent
101 * DROP - the reply should be quitely dropped
102 * DENIED - authp holds a reason for MSG_DENIED
103 * SYSERR - rpc system_err
106 * This call releases a domain.
108 * Givens a pending request (struct svc_rqst), finds and assigns
109 * an appropriate 'auth_domain' as the client.
113 struct module *owner;
115 int (*accept)(struct svc_rqst *rq, __be32 *authp);
116 int (*release)(struct svc_rqst *rq);
117 void (*domain_release)(struct auth_domain *);
118 int (*set_client)(struct svc_rqst *rq);
121 #define SVC_GARBAGE 1
124 #define SVC_NEGATIVE 4
127 #define SVC_CLOSE 7 /* Like SVC_DROP, but request is definitely
128 * lost so if there is a tcp connection, it
132 #define SVC_PENDING 9
133 #define SVC_COMPLETE 10
137 extern int svc_authenticate(struct svc_rqst *rqstp, __be32 *authp);
138 extern int svc_authorise(struct svc_rqst *rqstp);
139 extern int svc_set_client(struct svc_rqst *rqstp);
140 extern int svc_auth_register(rpc_authflavor_t flavor, struct auth_ops *aops);
141 extern void svc_auth_unregister(rpc_authflavor_t flavor);
143 extern struct auth_domain *unix_domain_find(char *name);
144 extern void auth_domain_put(struct auth_domain *item);
145 extern int auth_unix_add_addr(struct net *net, struct in6_addr *addr, struct auth_domain *dom);
146 extern struct auth_domain *auth_domain_lookup(char *name, struct auth_domain *new);
147 extern struct auth_domain *auth_domain_find(char *name);
148 extern struct auth_domain *auth_unix_lookup(struct net *net, struct in6_addr *addr);
149 extern int auth_unix_forget_old(struct auth_domain *dom);
150 extern void svcauth_unix_purge(struct net *net);
151 extern void svcauth_unix_info_release(struct svc_xprt *xpt);
152 extern int svcauth_unix_set_client(struct svc_rqst *rqstp);
154 extern int unix_gid_cache_create(struct net *net);
155 extern void unix_gid_cache_destroy(struct net *net);
157 static inline unsigned long hash_str(char *name, int bits)
159 unsigned long hash = 0;
164 if (unlikely(!(c = *name++))) {
165 c = (char)len; len = -1;
169 if ((len & (BITS_PER_LONG/8-1))==0)
170 hash = hash_long(hash^l, BITS_PER_LONG);
172 return hash >> (BITS_PER_LONG - bits);
175 static inline unsigned long hash_mem(char *buf, int length, int bits)
177 unsigned long hash = 0;
183 c = (char)len; len = -1;
188 if ((len & (BITS_PER_LONG/8-1))==0)
189 hash = hash_long(hash^l, BITS_PER_LONG);
191 return hash >> (BITS_PER_LONG - bits);
194 #endif /* __KERNEL__ */
196 #endif /* _LINUX_SUNRPC_SVCAUTH_H_ */