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1da177e4 LT |
1 | /* |
2 | * linux/include/linux/sunrpc/svcauth.h | |
3 | * | |
4 | * RPC server-side authentication stuff. | |
5 | * | |
6 | * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> | |
7 | */ | |
8 | ||
9 | #ifndef _LINUX_SUNRPC_SVCAUTH_H_ | |
10 | #define _LINUX_SUNRPC_SVCAUTH_H_ | |
11 | ||
12 | #ifdef __KERNEL__ | |
13 | ||
14 | #include <linux/string.h> | |
15 | #include <linux/sunrpc/msg_prot.h> | |
16 | #include <linux/sunrpc/cache.h> | |
17 | #include <linux/hash.h> | |
18 | ||
19 | #define SVC_CRED_NGROUPS 32 | |
20 | struct svc_cred { | |
21 | uid_t cr_uid; | |
22 | gid_t cr_gid; | |
23 | struct group_info *cr_group_info; | |
24 | }; | |
25 | ||
26 | struct svc_rqst; /* forward decl */ | |
f15364bd | 27 | struct in6_addr; |
1da177e4 LT |
28 | |
29 | /* Authentication is done in the context of a domain. | |
30 | * | |
31 | * Currently, the nfs server uses the auth_domain to stand | |
32 | * for the "client" listed in /etc/exports. | |
33 | * | |
34 | * More generally, a domain might represent a group of clients using | |
35 | * a common mechanism for authentication and having a common mapping | |
36 | * between local identity (uid) and network identity. All clients | |
37 | * in a domain have similar general access rights. Each domain can | |
38 | * contain multiple principals which will have different specific right | |
39 | * based on normal Discretionary Access Control. | |
40 | * | |
41 | * A domain is created by an authentication flavour module based on name | |
42 | * only. Userspace then fills in detail on demand. | |
43 | * | |
44 | * In the case of auth_unix and auth_null, the auth_domain is also | |
45 | * associated with entries in another cache representing the mapping | |
46 | * of ip addresses to the given client. | |
47 | */ | |
48 | struct auth_domain { | |
efc36aa5 N |
49 | struct kref ref; |
50 | struct hlist_node hash; | |
1da177e4 | 51 | char *name; |
efc36aa5 | 52 | struct auth_ops *flavour; |
1da177e4 LT |
53 | }; |
54 | ||
55 | /* | |
56 | * Each authentication flavour registers an auth_ops | |
57 | * structure. | |
58 | * name is simply the name. | |
59 | * flavour gives the auth flavour. It determines where the flavour is registered | |
60 | * accept() is given a request and should verify it. | |
61 | * It should inspect the authenticator and verifier, and possibly the data. | |
62 | * If there is a problem with the authentication *authp should be set. | |
63 | * The return value of accept() can indicate: | |
64 | * OK - authorised. client and credential are set in rqstp. | |
65 | * reqbuf points to arguments | |
66 | * resbuf points to good place for results. verfier | |
67 | * is (probably) already in place. Certainly space is | |
68 | * reserved for it. | |
69 | * DROP - simply drop the request. It may have been deferred | |
70 | * GARBAGE - rpc garbage_args error | |
71 | * SYSERR - rpc system_err error | |
72 | * DENIED - authp holds reason for denial. | |
73 | * COMPLETE - the reply is encoded already and ready to be sent; no | |
74 | * further processing is necessary. (This is used for processing | |
75 | * null procedure calls which are used to set up encryption | |
76 | * contexts.) | |
77 | * | |
78 | * accept is passed the proc number so that it can accept NULL rpc requests | |
79 | * even if it cannot authenticate the client (as is sometimes appropriate). | |
80 | * | |
81 | * release() is given a request after the procedure has been run. | |
82 | * It should sign/encrypt the results if needed | |
83 | * It should return: | |
84 | * OK - the resbuf is ready to be sent | |
85 | * DROP - the reply should be quitely dropped | |
86 | * DENIED - authp holds a reason for MSG_DENIED | |
87 | * SYSERR - rpc system_err | |
88 | * | |
89 | * domain_release() | |
90 | * This call releases a domain. | |
efc36aa5 N |
91 | * set_client() |
92 | * Givens a pending request (struct svc_rqst), finds and assigns | |
93 | * an appropriate 'auth_domain' as the client. | |
1da177e4 LT |
94 | */ |
95 | struct auth_ops { | |
96 | char * name; | |
97 | struct module *owner; | |
98 | int flavour; | |
d8ed029d | 99 | int (*accept)(struct svc_rqst *rq, __be32 *authp); |
1da177e4 LT |
100 | int (*release)(struct svc_rqst *rq); |
101 | void (*domain_release)(struct auth_domain *); | |
102 | int (*set_client)(struct svc_rqst *rq); | |
103 | }; | |
104 | ||
105 | #define SVC_GARBAGE 1 | |
106 | #define SVC_SYSERR 2 | |
107 | #define SVC_VALID 3 | |
108 | #define SVC_NEGATIVE 4 | |
109 | #define SVC_OK 5 | |
110 | #define SVC_DROP 6 | |
111 | #define SVC_DENIED 7 | |
112 | #define SVC_PENDING 8 | |
113 | #define SVC_COMPLETE 9 | |
114 | ||
115 | ||
d8ed029d | 116 | extern int svc_authenticate(struct svc_rqst *rqstp, __be32 *authp); |
1da177e4 LT |
117 | extern int svc_authorise(struct svc_rqst *rqstp); |
118 | extern int svc_set_client(struct svc_rqst *rqstp); | |
119 | extern int svc_auth_register(rpc_authflavor_t flavor, struct auth_ops *aops); | |
120 | extern void svc_auth_unregister(rpc_authflavor_t flavor); | |
121 | ||
122 | extern struct auth_domain *unix_domain_find(char *name); | |
123 | extern void auth_domain_put(struct auth_domain *item); | |
f15364bd | 124 | extern int auth_unix_add_addr(struct in6_addr *addr, struct auth_domain *dom); |
efc36aa5 | 125 | extern struct auth_domain *auth_domain_lookup(char *name, struct auth_domain *new); |
1da177e4 | 126 | extern struct auth_domain *auth_domain_find(char *name); |
f15364bd | 127 | extern struct auth_domain *auth_unix_lookup(struct in6_addr *addr); |
1da177e4 LT |
128 | extern int auth_unix_forget_old(struct auth_domain *dom); |
129 | extern void svcauth_unix_purge(void); | |
7b2b1fee | 130 | extern void svcauth_unix_info_release(void *); |
3ab4d8b1 | 131 | extern int svcauth_unix_set_client(struct svc_rqst *rqstp); |
1da177e4 LT |
132 | |
133 | static inline unsigned long hash_str(char *name, int bits) | |
134 | { | |
135 | unsigned long hash = 0; | |
136 | unsigned long l = 0; | |
137 | int len = 0; | |
138 | unsigned char c; | |
139 | do { | |
140 | if (unlikely(!(c = *name++))) { | |
141 | c = (char)len; len = -1; | |
142 | } | |
143 | l = (l << 8) | c; | |
144 | len++; | |
145 | if ((len & (BITS_PER_LONG/8-1))==0) | |
146 | hash = hash_long(hash^l, BITS_PER_LONG); | |
147 | } while (len); | |
148 | return hash >> (BITS_PER_LONG - bits); | |
149 | } | |
150 | ||
151 | static inline unsigned long hash_mem(char *buf, int length, int bits) | |
152 | { | |
153 | unsigned long hash = 0; | |
154 | unsigned long l = 0; | |
155 | int len = 0; | |
156 | unsigned char c; | |
157 | do { | |
158 | if (len == length) { | |
159 | c = (char)len; len = -1; | |
160 | } else | |
161 | c = *buf++; | |
162 | l = (l << 8) | c; | |
163 | len++; | |
164 | if ((len & (BITS_PER_LONG/8-1))==0) | |
165 | hash = hash_long(hash^l, BITS_PER_LONG); | |
166 | } while (len); | |
167 | return hash >> (BITS_PER_LONG - bits); | |
168 | } | |
169 | ||
1da177e4 LT |
170 | #endif /* __KERNEL__ */ |
171 | ||
172 | #endif /* _LINUX_SUNRPC_SVCAUTH_H_ */ |