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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> | |
0dc1531a | 17 | #include <linux/sunrpc/gss_api.h> |
1da177e4 | 18 | #include <linux/hash.h> |
03a4e1f6 | 19 | #include <linux/cred.h> |
1da177e4 | 20 | |
1da177e4 | 21 | struct svc_cred { |
7eaf040b EB |
22 | kuid_t cr_uid; |
23 | kgid_t cr_gid; | |
1da177e4 | 24 | struct group_info *cr_group_info; |
d5497fc6 | 25 | u32 cr_flavor; /* pseudoflavor */ |
414ca017 BF |
26 | /* name of form servicetype/hostname@REALM, passed down by |
27 | * gss-proxy: */ | |
28 | char *cr_raw_principal; | |
29 | /* name of form servicetype@hostname, passed down by | |
30 | * rpc.svcgssd, or computed from the above: */ | |
31 | char *cr_principal; | |
0dc1531a | 32 | struct gss_api_mech *cr_gss_mech; |
1da177e4 LT |
33 | }; |
34 | ||
44234063 BF |
35 | static inline void init_svc_cred(struct svc_cred *cred) |
36 | { | |
37 | cred->cr_group_info = NULL; | |
414ca017 | 38 | cred->cr_raw_principal = NULL; |
44234063 BF |
39 | cred->cr_principal = NULL; |
40 | cred->cr_gss_mech = NULL; | |
41 | } | |
42 | ||
03a4e1f6 BF |
43 | static inline void free_svc_cred(struct svc_cred *cred) |
44 | { | |
45 | if (cred->cr_group_info) | |
46 | put_group_info(cred->cr_group_info); | |
414ca017 | 47 | kfree(cred->cr_raw_principal); |
03a4e1f6 | 48 | kfree(cred->cr_principal); |
0dc1531a BF |
49 | gss_mech_put(cred->cr_gss_mech); |
50 | init_svc_cred(cred); | |
03a4e1f6 BF |
51 | } |
52 | ||
1da177e4 | 53 | struct svc_rqst; /* forward decl */ |
f15364bd | 54 | struct in6_addr; |
1da177e4 LT |
55 | |
56 | /* Authentication is done in the context of a domain. | |
57 | * | |
58 | * Currently, the nfs server uses the auth_domain to stand | |
59 | * for the "client" listed in /etc/exports. | |
60 | * | |
61 | * More generally, a domain might represent a group of clients using | |
62 | * a common mechanism for authentication and having a common mapping | |
63 | * between local identity (uid) and network identity. All clients | |
64 | * in a domain have similar general access rights. Each domain can | |
65 | * contain multiple principals which will have different specific right | |
66 | * based on normal Discretionary Access Control. | |
67 | * | |
68 | * A domain is created by an authentication flavour module based on name | |
69 | * only. Userspace then fills in detail on demand. | |
70 | * | |
71 | * In the case of auth_unix and auth_null, the auth_domain is also | |
72 | * associated with entries in another cache representing the mapping | |
73 | * of ip addresses to the given client. | |
74 | */ | |
75 | struct auth_domain { | |
efc36aa5 N |
76 | struct kref ref; |
77 | struct hlist_node hash; | |
1da177e4 | 78 | char *name; |
efc36aa5 | 79 | struct auth_ops *flavour; |
1da177e4 LT |
80 | }; |
81 | ||
82 | /* | |
83 | * Each authentication flavour registers an auth_ops | |
84 | * structure. | |
85 | * name is simply the name. | |
86 | * flavour gives the auth flavour. It determines where the flavour is registered | |
87 | * accept() is given a request and should verify it. | |
88 | * It should inspect the authenticator and verifier, and possibly the data. | |
89 | * If there is a problem with the authentication *authp should be set. | |
90 | * The return value of accept() can indicate: | |
91 | * OK - authorised. client and credential are set in rqstp. | |
92 | * reqbuf points to arguments | |
93 | * resbuf points to good place for results. verfier | |
94 | * is (probably) already in place. Certainly space is | |
95 | * reserved for it. | |
96 | * DROP - simply drop the request. It may have been deferred | |
97 | * GARBAGE - rpc garbage_args error | |
98 | * SYSERR - rpc system_err error | |
99 | * DENIED - authp holds reason for denial. | |
100 | * COMPLETE - the reply is encoded already and ready to be sent; no | |
101 | * further processing is necessary. (This is used for processing | |
102 | * null procedure calls which are used to set up encryption | |
103 | * contexts.) | |
104 | * | |
105 | * accept is passed the proc number so that it can accept NULL rpc requests | |
106 | * even if it cannot authenticate the client (as is sometimes appropriate). | |
107 | * | |
108 | * release() is given a request after the procedure has been run. | |
109 | * It should sign/encrypt the results if needed | |
110 | * It should return: | |
111 | * OK - the resbuf is ready to be sent | |
112 | * DROP - the reply should be quitely dropped | |
113 | * DENIED - authp holds a reason for MSG_DENIED | |
114 | * SYSERR - rpc system_err | |
115 | * | |
116 | * domain_release() | |
117 | * This call releases a domain. | |
efc36aa5 N |
118 | * set_client() |
119 | * Givens a pending request (struct svc_rqst), finds and assigns | |
120 | * an appropriate 'auth_domain' as the client. | |
1da177e4 LT |
121 | */ |
122 | struct auth_ops { | |
123 | char * name; | |
124 | struct module *owner; | |
125 | int flavour; | |
d8ed029d | 126 | int (*accept)(struct svc_rqst *rq, __be32 *authp); |
1da177e4 LT |
127 | int (*release)(struct svc_rqst *rq); |
128 | void (*domain_release)(struct auth_domain *); | |
129 | int (*set_client)(struct svc_rqst *rq); | |
130 | }; | |
131 | ||
132 | #define SVC_GARBAGE 1 | |
133 | #define SVC_SYSERR 2 | |
134 | #define SVC_VALID 3 | |
135 | #define SVC_NEGATIVE 4 | |
136 | #define SVC_OK 5 | |
137 | #define SVC_DROP 6 | |
1ebede86 N |
138 | #define SVC_CLOSE 7 /* Like SVC_DROP, but request is definitely |
139 | * lost so if there is a tcp connection, it | |
140 | * should be closed | |
141 | */ | |
142 | #define SVC_DENIED 8 | |
143 | #define SVC_PENDING 9 | |
144 | #define SVC_COMPLETE 10 | |
1da177e4 | 145 | |
e3bfca01 | 146 | struct svc_xprt; |
1da177e4 | 147 | |
d8ed029d | 148 | extern int svc_authenticate(struct svc_rqst *rqstp, __be32 *authp); |
1da177e4 LT |
149 | extern int svc_authorise(struct svc_rqst *rqstp); |
150 | extern int svc_set_client(struct svc_rqst *rqstp); | |
151 | extern int svc_auth_register(rpc_authflavor_t flavor, struct auth_ops *aops); | |
152 | extern void svc_auth_unregister(rpc_authflavor_t flavor); | |
153 | ||
154 | extern struct auth_domain *unix_domain_find(char *name); | |
155 | extern void auth_domain_put(struct auth_domain *item); | |
352114f3 | 156 | extern int auth_unix_add_addr(struct net *net, struct in6_addr *addr, struct auth_domain *dom); |
efc36aa5 | 157 | extern struct auth_domain *auth_domain_lookup(char *name, struct auth_domain *new); |
1da177e4 | 158 | extern struct auth_domain *auth_domain_find(char *name); |
352114f3 | 159 | extern struct auth_domain *auth_unix_lookup(struct net *net, struct in6_addr *addr); |
1da177e4 | 160 | extern int auth_unix_forget_old(struct auth_domain *dom); |
e5f06f72 | 161 | extern void svcauth_unix_purge(struct net *net); |
e3bfca01 | 162 | extern void svcauth_unix_info_release(struct svc_xprt *xpt); |
3ab4d8b1 | 163 | extern int svcauth_unix_set_client(struct svc_rqst *rqstp); |
1da177e4 | 164 | |
09acfea5 TM |
165 | extern int unix_gid_cache_create(struct net *net); |
166 | extern void unix_gid_cache_destroy(struct net *net); | |
167 | ||
1da177e4 LT |
168 | static inline unsigned long hash_str(char *name, int bits) |
169 | { | |
170 | unsigned long hash = 0; | |
171 | unsigned long l = 0; | |
172 | int len = 0; | |
173 | unsigned char c; | |
174 | do { | |
175 | if (unlikely(!(c = *name++))) { | |
176 | c = (char)len; len = -1; | |
177 | } | |
178 | l = (l << 8) | c; | |
179 | len++; | |
180 | if ((len & (BITS_PER_LONG/8-1))==0) | |
181 | hash = hash_long(hash^l, BITS_PER_LONG); | |
182 | } while (len); | |
183 | return hash >> (BITS_PER_LONG - bits); | |
184 | } | |
185 | ||
186 | static inline unsigned long hash_mem(char *buf, int length, int bits) | |
187 | { | |
188 | unsigned long hash = 0; | |
189 | unsigned long l = 0; | |
190 | int len = 0; | |
191 | unsigned char c; | |
192 | do { | |
193 | if (len == length) { | |
194 | c = (char)len; len = -1; | |
195 | } else | |
196 | c = *buf++; | |
197 | l = (l << 8) | c; | |
198 | len++; | |
199 | if ((len & (BITS_PER_LONG/8-1))==0) | |
200 | hash = hash_long(hash^l, BITS_PER_LONG); | |
201 | } while (len); | |
202 | return hash >> (BITS_PER_LONG - bits); | |
203 | } | |
204 | ||
1da177e4 LT |
205 | #endif /* __KERNEL__ */ |
206 | ||
207 | #endif /* _LINUX_SUNRPC_SVCAUTH_H_ */ |