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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/sunrpc/auth_unix.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'net/sunrpc/auth_unix.c')
-rw-r--r--net/sunrpc/auth_unix.c242
1 files changed, 242 insertions, 0 deletions
diff --git a/net/sunrpc/auth_unix.c b/net/sunrpc/auth_unix.c
new file mode 100644
index 000000000000..4ff297a9b15b
--- /dev/null
+++ b/net/sunrpc/auth_unix.c
@@ -0,0 +1,242 @@
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/types.h>
10#include <linux/sched.h>
11#include <linux/module.h>
12#include <linux/socket.h>
13#include <linux/in.h>
14#include <linux/sunrpc/clnt.h>
15#include <linux/sunrpc/auth.h>
16
17#define NFS_NGROUPS 16
18
19struct unx_cred {
20 struct rpc_cred uc_base;
21 gid_t uc_gid;
22 gid_t uc_gids[NFS_NGROUPS];
23};
24#define uc_uid uc_base.cr_uid
25#define uc_count uc_base.cr_count
26#define uc_flags uc_base.cr_flags
27#define uc_expire uc_base.cr_expire
28
29#define UNX_CRED_EXPIRE (60 * HZ)
30
31#define UNX_WRITESLACK (21 + (UNX_MAXNODENAME >> 2))
32
33#ifdef RPC_DEBUG
34# define RPCDBG_FACILITY RPCDBG_AUTH
35#endif
36
37static struct rpc_auth unix_auth;
38static struct rpc_cred_cache unix_cred_cache;
39static struct rpc_credops unix_credops;
40
41static struct rpc_auth *
42unx_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
43{
44 dprintk("RPC: creating UNIX authenticator for client %p\n", clnt);
45 if (atomic_inc_return(&unix_auth.au_count) == 0)
46 unix_cred_cache.nextgc = jiffies + (unix_cred_cache.expire >> 1);
47 return &unix_auth;
48}
49
50static void
51unx_destroy(struct rpc_auth *auth)
52{
53 dprintk("RPC: destroying UNIX authenticator %p\n", auth);
54 rpcauth_free_credcache(auth);
55}
56
57/*
58 * Lookup AUTH_UNIX creds for current process
59 */
60static struct rpc_cred *
61unx_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
62{
63 return rpcauth_lookup_credcache(auth, acred, flags);
64}
65
66static struct rpc_cred *
67unx_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
68{
69 struct unx_cred *cred;
70 int i;
71
72 dprintk("RPC: allocating UNIX cred for uid %d gid %d\n",
73 acred->uid, acred->gid);
74
75 if (!(cred = (struct unx_cred *) kmalloc(sizeof(*cred), GFP_KERNEL)))
76 return ERR_PTR(-ENOMEM);
77
78 atomic_set(&cred->uc_count, 1);
79 cred->uc_flags = RPCAUTH_CRED_UPTODATE;
80 if (flags & RPC_TASK_ROOTCREDS) {
81 cred->uc_uid = 0;
82 cred->uc_gid = 0;
83 cred->uc_gids[0] = NOGROUP;
84 } else {
85 int groups = acred->group_info->ngroups;
86 if (groups > NFS_NGROUPS)
87 groups = NFS_NGROUPS;
88
89 cred->uc_uid = acred->uid;
90 cred->uc_gid = acred->gid;
91 for (i = 0; i < groups; i++)
92 cred->uc_gids[i] = GROUP_AT(acred->group_info, i);
93 if (i < NFS_NGROUPS)
94 cred->uc_gids[i] = NOGROUP;
95 }
96 cred->uc_base.cr_ops = &unix_credops;
97
98 return (struct rpc_cred *) cred;
99}
100
101static void
102unx_destroy_cred(struct rpc_cred *cred)
103{
104 kfree(cred);
105}
106
107/*
108 * Match credentials against current process creds.
109 * The root_override argument takes care of cases where the caller may
110 * request root creds (e.g. for NFS swapping).
111 */
112static int
113unx_match(struct auth_cred *acred, struct rpc_cred *rcred, int taskflags)
114{
115 struct unx_cred *cred = (struct unx_cred *) rcred;
116 int i;
117
118 if (!(taskflags & RPC_TASK_ROOTCREDS)) {
119 int groups;
120
121 if (cred->uc_uid != acred->uid
122 || cred->uc_gid != acred->gid)
123 return 0;
124
125 groups = acred->group_info->ngroups;
126 if (groups > NFS_NGROUPS)
127 groups = NFS_NGROUPS;
128 for (i = 0; i < groups ; i++)
129 if (cred->uc_gids[i] != GROUP_AT(acred->group_info, i))
130 return 0;
131 return 1;
132 }
133 return (cred->uc_uid == 0
134 && cred->uc_gid == 0
135 && cred->uc_gids[0] == (gid_t) NOGROUP);
136}
137
138/*
139 * Marshal credentials.
140 * Maybe we should keep a cached credential for performance reasons.
141 */
142static u32 *
143unx_marshal(struct rpc_task *task, u32 *p)
144{
145 struct rpc_clnt *clnt = task->tk_client;
146 struct unx_cred *cred = (struct unx_cred *) task->tk_msg.rpc_cred;
147 u32 *base, *hold;
148 int i;
149
150 *p++ = htonl(RPC_AUTH_UNIX);
151 base = p++;
152 *p++ = htonl(jiffies/HZ);
153
154 /*
155 * Copy the UTS nodename captured when the client was created.
156 */
157 p = xdr_encode_array(p, clnt->cl_nodename, clnt->cl_nodelen);
158
159 *p++ = htonl((u32) cred->uc_uid);
160 *p++ = htonl((u32) cred->uc_gid);
161 hold = p++;
162 for (i = 0; i < 16 && cred->uc_gids[i] != (gid_t) NOGROUP; i++)
163 *p++ = htonl((u32) cred->uc_gids[i]);
164 *hold = htonl(p - hold - 1); /* gid array length */
165 *base = htonl((p - base - 1) << 2); /* cred length */
166
167 *p++ = htonl(RPC_AUTH_NULL);
168 *p++ = htonl(0);
169
170 return p;
171}
172
173/*
174 * Refresh credentials. This is a no-op for AUTH_UNIX
175 */
176static int
177unx_refresh(struct rpc_task *task)
178{
179 task->tk_msg.rpc_cred->cr_flags |= RPCAUTH_CRED_UPTODATE;
180 return 0;
181}
182
183static u32 *
184unx_validate(struct rpc_task *task, u32 *p)
185{
186 rpc_authflavor_t flavor;
187 u32 size;
188
189 flavor = ntohl(*p++);
190 if (flavor != RPC_AUTH_NULL &&
191 flavor != RPC_AUTH_UNIX &&
192 flavor != RPC_AUTH_SHORT) {
193 printk("RPC: bad verf flavor: %u\n", flavor);
194 return NULL;
195 }
196
197 size = ntohl(*p++);
198 if (size > RPC_MAX_AUTH_SIZE) {
199 printk("RPC: giant verf size: %u\n", size);
200 return NULL;
201 }
202 task->tk_auth->au_rslack = (size >> 2) + 2;
203 p += (size >> 2);
204
205 return p;
206}
207
208struct rpc_authops authunix_ops = {
209 .owner = THIS_MODULE,
210 .au_flavor = RPC_AUTH_UNIX,
211#ifdef RPC_DEBUG
212 .au_name = "UNIX",
213#endif
214 .create = unx_create,
215 .destroy = unx_destroy,
216 .lookup_cred = unx_lookup_cred,
217 .crcreate = unx_create_cred,
218};
219
220static
221struct rpc_cred_cache unix_cred_cache = {
222 .expire = UNX_CRED_EXPIRE,
223};
224
225static
226struct rpc_auth unix_auth = {
227 .au_cslack = UNX_WRITESLACK,
228 .au_rslack = 2, /* assume AUTH_NULL verf */
229 .au_ops = &authunix_ops,
230 .au_count = ATOMIC_INIT(0),
231 .au_credcache = &unix_cred_cache,
232};
233
234static
235struct rpc_credops unix_credops = {
236 .cr_name = "AUTH_UNIX",
237 .crdestroy = unx_destroy_cred,
238 .crmatch = unx_match,
239 .crmarshal = unx_marshal,
240 .crrefresh = unx_refresh,
241 .crvalidate = unx_validate,
242};