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1 | /* |
2 | * linux/net/sunrpc/auth_unix.c |
3 | * |
4 | * UNIX-style authentication; no AUTH_SHORT support |
5 | * |
6 | * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de> |
7 | */ |
8 | |
9 | #include <linux/slab.h> |
10 | #include <linux/types.h> |
11 | #include <linux/sched.h> |
12 | #include <linux/module.h> |
13 | #include <linux/sunrpc/clnt.h> |
14 | #include <linux/sunrpc/auth.h> |
15 | |
16 | #define NFS_NGROUPS 16 |
17 | |
18 | struct unx_cred { |
19 | struct rpc_cred uc_base; |
20 | gid_t uc_gid; |
21 | gid_t uc_gids[NFS_NGROUPS]; |
22 | }; |
23 | #define uc_uid uc_base.cr_uid |
24 | |
25 | #define UNX_WRITESLACK (21 + (UNX_MAXNODENAME >> 2)) |
26 | |
27 | #ifdef RPC_DEBUG |
28 | # define RPCDBG_FACILITY RPCDBG_AUTH |
29 | #endif |
30 | |
31 | static struct rpc_auth unix_auth; |
32 | static struct rpc_cred_cache unix_cred_cache; |
33 | static const struct rpc_credops unix_credops; |
34 | |
35 | static struct rpc_auth * |
36 | unx_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor) |
37 | { |
38 | dprintk("RPC: creating UNIX authenticator for client %p\n", |
39 | clnt); |
40 | atomic_inc(&unix_auth.au_count); |
41 | return &unix_auth; |
42 | } |
43 | |
44 | static void |
45 | unx_destroy(struct rpc_auth *auth) |
46 | { |
47 | dprintk("RPC: destroying UNIX authenticator %p\n", auth); |
48 | rpcauth_clear_credcache(auth->au_credcache); |
49 | } |
50 | |
51 | /* |
52 | * Lookup AUTH_UNIX creds for current process |
53 | */ |
54 | static struct rpc_cred * |
55 | unx_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) |
56 | { |
57 | return rpcauth_lookup_credcache(auth, acred, flags); |
58 | } |
59 | |
60 | static struct rpc_cred * |
61 | unx_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) |
62 | { |
63 | struct unx_cred *cred; |
64 | unsigned int groups = 0; |
65 | unsigned int i; |
66 | |
67 | dprintk("RPC: allocating UNIX cred for uid %d gid %d\n", |
68 | acred->uid, acred->gid); |
69 | |
70 | if (!(cred = kmalloc(sizeof(*cred), GFP_NOFS))) |
71 | return ERR_PTR(-ENOMEM); |
72 | |
73 | rpcauth_init_cred(&cred->uc_base, acred, auth, &unix_credops); |
74 | cred->uc_base.cr_flags = 1UL << RPCAUTH_CRED_UPTODATE; |
75 | |
76 | if (acred->group_info != NULL) |
77 | groups = acred->group_info->ngroups; |
78 | if (groups > NFS_NGROUPS) |
79 | groups = NFS_NGROUPS; |
80 | |
81 | cred->uc_gid = acred->gid; |
82 | for (i = 0; i < groups; i++) |
83 | cred->uc_gids[i] = GROUP_AT(acred->group_info, i); |
84 | if (i < NFS_NGROUPS) |
85 | cred->uc_gids[i] = NOGROUP; |
86 | |
87 | return &cred->uc_base; |
88 | } |
89 | |
90 | static void |
91 | unx_free_cred(struct unx_cred *unx_cred) |
92 | { |
93 | dprintk("RPC: unx_free_cred %p\n", unx_cred); |
94 | kfree(unx_cred); |
95 | } |
96 | |
97 | static void |
98 | unx_free_cred_callback(struct rcu_head *head) |
99 | { |
100 | struct unx_cred *unx_cred = container_of(head, struct unx_cred, uc_base.cr_rcu); |
101 | unx_free_cred(unx_cred); |
102 | } |
103 | |
104 | static void |
105 | unx_destroy_cred(struct rpc_cred *cred) |
106 | { |
107 | call_rcu(&cred->cr_rcu, unx_free_cred_callback); |
108 | } |
109 | |
110 | /* |
111 | * Match credentials against current process creds. |
112 | * The root_override argument takes care of cases where the caller may |
113 | * request root creds (e.g. for NFS swapping). |
114 | */ |
115 | static int |
116 | unx_match(struct auth_cred *acred, struct rpc_cred *rcred, int flags) |
117 | { |
118 | struct unx_cred *cred = container_of(rcred, struct unx_cred, uc_base); |
119 | unsigned int groups = 0; |
120 | unsigned int i; |
121 | |
122 | |
123 | if (cred->uc_uid != acred->uid || cred->uc_gid != acred->gid) |
124 | return 0; |
125 | |
126 | if (acred->group_info != NULL) |
127 | groups = acred->group_info->ngroups; |
128 | if (groups > NFS_NGROUPS) |
129 | groups = NFS_NGROUPS; |
130 | for (i = 0; i < groups ; i++) |
131 | if (cred->uc_gids[i] != GROUP_AT(acred->group_info, i)) |
132 | return 0; |
133 | return 1; |
134 | } |
135 | |
136 | /* |
137 | * Marshal credentials. |
138 | * Maybe we should keep a cached credential for performance reasons. |
139 | */ |
140 | static __be32 * |
141 | unx_marshal(struct rpc_task *task, __be32 *p) |
142 | { |
143 | struct rpc_clnt *clnt = task->tk_client; |
144 | struct unx_cred *cred = container_of(task->tk_msg.rpc_cred, struct unx_cred, uc_base); |
145 | __be32 *base, *hold; |
146 | int i; |
147 | |
148 | *p++ = htonl(RPC_AUTH_UNIX); |
149 | base = p++; |
150 | *p++ = htonl(jiffies/HZ); |
151 | |
152 | /* |
153 | * Copy the UTS nodename captured when the client was created. |
154 | */ |
155 | p = xdr_encode_array(p, clnt->cl_nodename, clnt->cl_nodelen); |
156 | |
157 | *p++ = htonl((u32) cred->uc_uid); |
158 | *p++ = htonl((u32) cred->uc_gid); |
159 | hold = p++; |
160 | for (i = 0; i < 16 && cred->uc_gids[i] != (gid_t) NOGROUP; i++) |
161 | *p++ = htonl((u32) cred->uc_gids[i]); |
162 | *hold = htonl(p - hold - 1); /* gid array length */ |
163 | *base = htonl((p - base - 1) << 2); /* cred length */ |
164 | |
165 | *p++ = htonl(RPC_AUTH_NULL); |
166 | *p++ = htonl(0); |
167 | |
168 | return p; |
169 | } |
170 | |
171 | /* |
172 | * Refresh credentials. This is a no-op for AUTH_UNIX |
173 | */ |
174 | static int |
175 | unx_refresh(struct rpc_task *task) |
176 | { |
177 | set_bit(RPCAUTH_CRED_UPTODATE, &task->tk_msg.rpc_cred->cr_flags); |
178 | return 0; |
179 | } |
180 | |
181 | static __be32 * |
182 | unx_validate(struct rpc_task *task, __be32 *p) |
183 | { |
184 | rpc_authflavor_t flavor; |
185 | u32 size; |
186 | |
187 | flavor = ntohl(*p++); |
188 | if (flavor != RPC_AUTH_NULL && |
189 | flavor != RPC_AUTH_UNIX && |
190 | flavor != RPC_AUTH_SHORT) { |
191 | printk("RPC: bad verf flavor: %u\n", flavor); |
192 | return NULL; |
193 | } |
194 | |
195 | size = ntohl(*p++); |
196 | if (size > RPC_MAX_AUTH_SIZE) { |
197 | printk("RPC: giant verf size: %u\n", size); |
198 | return NULL; |
199 | } |
200 | task->tk_msg.rpc_cred->cr_auth->au_rslack = (size >> 2) + 2; |
201 | p += (size >> 2); |
202 | |
203 | return p; |
204 | } |
205 | |
206 | void __init rpc_init_authunix(void) |
207 | { |
208 | spin_lock_init(&unix_cred_cache.lock); |
209 | } |
210 | |
211 | const struct rpc_authops authunix_ops = { |
212 | .owner = THIS_MODULE, |
213 | .au_flavor = RPC_AUTH_UNIX, |
214 | .au_name = "UNIX", |
215 | .create = unx_create, |
216 | .destroy = unx_destroy, |
217 | .lookup_cred = unx_lookup_cred, |
218 | .crcreate = unx_create_cred, |
219 | }; |
220 | |
221 | static |
222 | struct rpc_cred_cache unix_cred_cache = { |
223 | }; |
224 | |
225 | static |
226 | struct rpc_auth unix_auth = { |
227 | .au_cslack = UNX_WRITESLACK, |
228 | .au_rslack = 2, /* assume AUTH_NULL verf */ |
229 | .au_ops = &authunix_ops, |
230 | .au_flavor = RPC_AUTH_UNIX, |
231 | .au_count = ATOMIC_INIT(0), |
232 | .au_credcache = &unix_cred_cache, |
233 | }; |
234 | |
235 | static |
236 | const struct rpc_credops unix_credops = { |
237 | .cr_name = "AUTH_UNIX", |
238 | .crdestroy = unx_destroy_cred, |
239 | .crbind = rpcauth_generic_bind_cred, |
240 | .crmatch = unx_match, |
241 | .crmarshal = unx_marshal, |
242 | .crrefresh = unx_refresh, |
243 | .crvalidate = unx_validate, |
244 | }; |
245 |
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