Commit | Line | Data |
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1da177e4 LT |
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 | ||
5a0e3ad6 | 9 | #include <linux/slab.h> |
1da177e4 LT |
10 | #include <linux/types.h> |
11 | #include <linux/sched.h> | |
12 | #include <linux/module.h> | |
1da177e4 LT |
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 | |
1da177e4 | 24 | |
1da177e4 LT |
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; | |
f1c0a861 | 33 | static const struct rpc_credops unix_credops; |
1da177e4 LT |
34 | |
35 | static struct rpc_auth * | |
36 | unx_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor) | |
37 | { | |
46121cf7 CL |
38 | dprintk("RPC: creating UNIX authenticator for client %p\n", |
39 | clnt); | |
f5c2187c | 40 | atomic_inc(&unix_auth.au_count); |
1da177e4 LT |
41 | return &unix_auth; |
42 | } | |
43 | ||
44 | static void | |
45 | unx_destroy(struct rpc_auth *auth) | |
46 | { | |
46121cf7 | 47 | dprintk("RPC: destroying UNIX authenticator %p\n", auth); |
3ab9bb72 | 48 | rpcauth_clear_credcache(auth->au_credcache); |
1da177e4 LT |
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; | |
af093835 TM |
64 | unsigned int groups = 0; |
65 | unsigned int i; | |
1da177e4 | 66 | |
46121cf7 CL |
67 | dprintk("RPC: allocating UNIX cred for uid %d gid %d\n", |
68 | acred->uid, acred->gid); | |
1da177e4 | 69 | |
0f38b873 | 70 | if (!(cred = kmalloc(sizeof(*cred), GFP_NOFS))) |
1da177e4 LT |
71 | return ERR_PTR(-ENOMEM); |
72 | ||
5fe4755e | 73 | rpcauth_init_cred(&cred->uc_base, acred, auth, &unix_credops); |
fc432dd9 | 74 | cred->uc_base.cr_flags = 1UL << RPCAUTH_CRED_UPTODATE; |
af093835 TM |
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; | |
1da177e4 | 86 | |
696e38df | 87 | return &cred->uc_base; |
1da177e4 LT |
88 | } |
89 | ||
90 | static void | |
31be5bf1 | 91 | unx_free_cred(struct unx_cred *unx_cred) |
1da177e4 | 92 | { |
31be5bf1 TM |
93 | dprintk("RPC: unx_free_cred %p\n", unx_cred); |
94 | kfree(unx_cred); | |
95 | } | |
696e38df | 96 | |
31be5bf1 TM |
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); | |
1da177e4 LT |
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 | |
8a317760 | 116 | unx_match(struct auth_cred *acred, struct rpc_cred *rcred, int flags) |
1da177e4 | 117 | { |
696e38df | 118 | struct unx_cred *cred = container_of(rcred, struct unx_cred, uc_base); |
af093835 TM |
119 | unsigned int groups = 0; |
120 | unsigned int i; | |
1da177e4 | 121 | |
1da177e4 | 122 | |
af093835 TM |
123 | if (cred->uc_uid != acred->uid || cred->uc_gid != acred->gid) |
124 | return 0; | |
1da177e4 | 125 | |
af093835 | 126 | if (acred->group_info != NULL) |
1da177e4 | 127 | groups = acred->group_info->ngroups; |
af093835 TM |
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; | |
1da177e4 LT |
134 | } |
135 | ||
136 | /* | |
137 | * Marshal credentials. | |
138 | * Maybe we should keep a cached credential for performance reasons. | |
139 | */ | |
d8ed029d AD |
140 | static __be32 * |
141 | unx_marshal(struct rpc_task *task, __be32 *p) | |
1da177e4 LT |
142 | { |
143 | struct rpc_clnt *clnt = task->tk_client; | |
696e38df | 144 | struct unx_cred *cred = container_of(task->tk_msg.rpc_cred, struct unx_cred, uc_base); |
d8ed029d | 145 | __be32 *base, *hold; |
1da177e4 LT |
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 | { | |
fc432dd9 | 177 | set_bit(RPCAUTH_CRED_UPTODATE, &task->tk_msg.rpc_cred->cr_flags); |
1da177e4 LT |
178 | return 0; |
179 | } | |
180 | ||
d8ed029d AD |
181 | static __be32 * |
182 | unx_validate(struct rpc_task *task, __be32 *p) | |
1da177e4 LT |
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 | } | |
1be27f36 | 200 | task->tk_msg.rpc_cred->cr_auth->au_rslack = (size >> 2) + 2; |
1da177e4 LT |
201 | p += (size >> 2); |
202 | ||
203 | return p; | |
204 | } | |
205 | ||
9499b434 TM |
206 | void __init rpc_init_authunix(void) |
207 | { | |
208 | spin_lock_init(&unix_cred_cache.lock); | |
209 | } | |
210 | ||
f1c0a861 | 211 | const struct rpc_authops authunix_ops = { |
1da177e4 LT |
212 | .owner = THIS_MODULE, |
213 | .au_flavor = RPC_AUTH_UNIX, | |
1da177e4 | 214 | .au_name = "UNIX", |
1da177e4 LT |
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 = { | |
1da177e4 LT |
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, | |
81039f1f | 230 | .au_flavor = RPC_AUTH_UNIX, |
1da177e4 LT |
231 | .au_count = ATOMIC_INIT(0), |
232 | .au_credcache = &unix_cred_cache, | |
233 | }; | |
234 | ||
235 | static | |
f1c0a861 | 236 | const struct rpc_credops unix_credops = { |
1da177e4 LT |
237 | .cr_name = "AUTH_UNIX", |
238 | .crdestroy = unx_destroy_cred, | |
5c691044 | 239 | .crbind = rpcauth_generic_bind_cred, |
1da177e4 LT |
240 | .crmatch = unx_match, |
241 | .crmarshal = unx_marshal, | |
242 | .crrefresh = unx_refresh, | |
243 | .crvalidate = unx_validate, | |
244 | }; |