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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> | |
ae2975bc | 15 | #include <linux/user_namespace.h> |
1da177e4 LT |
16 | |
17 | #define NFS_NGROUPS 16 | |
18 | ||
19 | struct unx_cred { | |
20 | struct rpc_cred uc_base; | |
7eaf040b EB |
21 | kgid_t uc_gid; |
22 | kgid_t uc_gids[NFS_NGROUPS]; | |
1da177e4 LT |
23 | }; |
24 | #define uc_uid uc_base.cr_uid | |
1da177e4 | 25 | |
f895b252 | 26 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
1da177e4 LT |
27 | # define RPCDBG_FACILITY RPCDBG_AUTH |
28 | #endif | |
29 | ||
30 | static struct rpc_auth unix_auth; | |
f1c0a861 | 31 | static const struct rpc_credops unix_credops; |
1da177e4 LT |
32 | |
33 | static struct rpc_auth * | |
c2190661 | 34 | unx_create(struct rpc_auth_create_args *args, struct rpc_clnt *clnt) |
1da177e4 | 35 | { |
46121cf7 CL |
36 | dprintk("RPC: creating UNIX authenticator for client %p\n", |
37 | clnt); | |
f5c2187c | 38 | atomic_inc(&unix_auth.au_count); |
1da177e4 LT |
39 | return &unix_auth; |
40 | } | |
41 | ||
42 | static void | |
43 | unx_destroy(struct rpc_auth *auth) | |
44 | { | |
46121cf7 | 45 | dprintk("RPC: destroying UNIX authenticator %p\n", auth); |
3ab9bb72 | 46 | rpcauth_clear_credcache(auth->au_credcache); |
1da177e4 LT |
47 | } |
48 | ||
1e035d06 FS |
49 | static int |
50 | unx_hash_cred(struct auth_cred *acred, unsigned int hashbits) | |
51 | { | |
52 | return hash_64(from_kgid(&init_user_ns, acred->gid) | | |
53 | ((u64)from_kuid(&init_user_ns, acred->uid) << | |
54 | (sizeof(gid_t) * 8)), hashbits); | |
55 | } | |
56 | ||
1da177e4 LT |
57 | /* |
58 | * Lookup AUTH_UNIX creds for current process | |
59 | */ | |
60 | static struct rpc_cred * | |
61 | unx_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) | |
62 | { | |
3c6e0bc8 | 63 | return rpcauth_lookup_credcache(auth, acred, flags, GFP_NOFS); |
1da177e4 LT |
64 | } |
65 | ||
66 | static struct rpc_cred * | |
3c6e0bc8 | 67 | unx_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags, gfp_t gfp) |
1da177e4 LT |
68 | { |
69 | struct unx_cred *cred; | |
af093835 TM |
70 | unsigned int groups = 0; |
71 | unsigned int i; | |
1da177e4 | 72 | |
46121cf7 | 73 | dprintk("RPC: allocating UNIX cred for uid %d gid %d\n", |
cdba321e EB |
74 | from_kuid(&init_user_ns, acred->uid), |
75 | from_kgid(&init_user_ns, acred->gid)); | |
1da177e4 | 76 | |
3c6e0bc8 | 77 | if (!(cred = kmalloc(sizeof(*cred), gfp))) |
1da177e4 LT |
78 | return ERR_PTR(-ENOMEM); |
79 | ||
5fe4755e | 80 | rpcauth_init_cred(&cred->uc_base, acred, auth, &unix_credops); |
fc432dd9 | 81 | cred->uc_base.cr_flags = 1UL << RPCAUTH_CRED_UPTODATE; |
af093835 TM |
82 | |
83 | if (acred->group_info != NULL) | |
84 | groups = acred->group_info->ngroups; | |
85 | if (groups > NFS_NGROUPS) | |
86 | groups = NFS_NGROUPS; | |
87 | ||
88 | cred->uc_gid = acred->gid; | |
9132adb0 | 89 | for (i = 0; i < groups; i++) |
81243eac | 90 | cred->uc_gids[i] = acred->group_info->gid[i]; |
af093835 | 91 | if (i < NFS_NGROUPS) |
bf37f794 | 92 | cred->uc_gids[i] = INVALID_GID; |
1da177e4 | 93 | |
696e38df | 94 | return &cred->uc_base; |
1da177e4 LT |
95 | } |
96 | ||
97 | static void | |
31be5bf1 | 98 | unx_free_cred(struct unx_cred *unx_cred) |
1da177e4 | 99 | { |
31be5bf1 TM |
100 | dprintk("RPC: unx_free_cred %p\n", unx_cred); |
101 | kfree(unx_cred); | |
102 | } | |
696e38df | 103 | |
31be5bf1 TM |
104 | static void |
105 | unx_free_cred_callback(struct rcu_head *head) | |
106 | { | |
107 | struct unx_cred *unx_cred = container_of(head, struct unx_cred, uc_base.cr_rcu); | |
108 | unx_free_cred(unx_cred); | |
109 | } | |
110 | ||
111 | static void | |
112 | unx_destroy_cred(struct rpc_cred *cred) | |
113 | { | |
114 | call_rcu(&cred->cr_rcu, unx_free_cred_callback); | |
1da177e4 LT |
115 | } |
116 | ||
117 | /* | |
118 | * Match credentials against current process creds. | |
119 | * The root_override argument takes care of cases where the caller may | |
120 | * request root creds (e.g. for NFS swapping). | |
121 | */ | |
122 | static int | |
8a317760 | 123 | unx_match(struct auth_cred *acred, struct rpc_cred *rcred, int flags) |
1da177e4 | 124 | { |
696e38df | 125 | struct unx_cred *cred = container_of(rcred, struct unx_cred, uc_base); |
af093835 TM |
126 | unsigned int groups = 0; |
127 | unsigned int i; | |
1da177e4 | 128 | |
1da177e4 | 129 | |
0b4d51b0 | 130 | if (!uid_eq(cred->uc_uid, acred->uid) || !gid_eq(cred->uc_gid, acred->gid)) |
af093835 | 131 | return 0; |
1da177e4 | 132 | |
af093835 | 133 | if (acred->group_info != NULL) |
1da177e4 | 134 | groups = acred->group_info->ngroups; |
af093835 TM |
135 | if (groups > NFS_NGROUPS) |
136 | groups = NFS_NGROUPS; | |
9132adb0 | 137 | for (i = 0; i < groups ; i++) |
81243eac | 138 | if (!gid_eq(cred->uc_gids[i], acred->group_info->gid[i])) |
af093835 | 139 | return 0; |
e572fc73 | 140 | if (groups < NFS_NGROUPS && gid_valid(cred->uc_gids[groups])) |
dc6f55e9 | 141 | return 0; |
af093835 | 142 | return 1; |
1da177e4 LT |
143 | } |
144 | ||
145 | /* | |
146 | * Marshal credentials. | |
147 | * Maybe we should keep a cached credential for performance reasons. | |
148 | */ | |
d8ed029d AD |
149 | static __be32 * |
150 | unx_marshal(struct rpc_task *task, __be32 *p) | |
1da177e4 LT |
151 | { |
152 | struct rpc_clnt *clnt = task->tk_client; | |
a17c2153 | 153 | struct unx_cred *cred = container_of(task->tk_rqstp->rq_cred, struct unx_cred, uc_base); |
d8ed029d | 154 | __be32 *base, *hold; |
1da177e4 LT |
155 | int i; |
156 | ||
157 | *p++ = htonl(RPC_AUTH_UNIX); | |
158 | base = p++; | |
159 | *p++ = htonl(jiffies/HZ); | |
160 | ||
161 | /* | |
162 | * Copy the UTS nodename captured when the client was created. | |
163 | */ | |
164 | p = xdr_encode_array(p, clnt->cl_nodename, clnt->cl_nodelen); | |
165 | ||
a570abbb EB |
166 | *p++ = htonl((u32) from_kuid(&init_user_ns, cred->uc_uid)); |
167 | *p++ = htonl((u32) from_kgid(&init_user_ns, cred->uc_gid)); | |
1da177e4 | 168 | hold = p++; |
e572fc73 | 169 | for (i = 0; i < 16 && gid_valid(cred->uc_gids[i]); i++) |
a570abbb | 170 | *p++ = htonl((u32) from_kgid(&init_user_ns, cred->uc_gids[i])); |
1da177e4 LT |
171 | *hold = htonl(p - hold - 1); /* gid array length */ |
172 | *base = htonl((p - base - 1) << 2); /* cred length */ | |
173 | ||
174 | *p++ = htonl(RPC_AUTH_NULL); | |
175 | *p++ = htonl(0); | |
176 | ||
177 | return p; | |
178 | } | |
179 | ||
180 | /* | |
181 | * Refresh credentials. This is a no-op for AUTH_UNIX | |
182 | */ | |
183 | static int | |
184 | unx_refresh(struct rpc_task *task) | |
185 | { | |
a17c2153 | 186 | set_bit(RPCAUTH_CRED_UPTODATE, &task->tk_rqstp->rq_cred->cr_flags); |
1da177e4 LT |
187 | return 0; |
188 | } | |
189 | ||
d8ed029d AD |
190 | static __be32 * |
191 | unx_validate(struct rpc_task *task, __be32 *p) | |
1da177e4 LT |
192 | { |
193 | rpc_authflavor_t flavor; | |
194 | u32 size; | |
195 | ||
196 | flavor = ntohl(*p++); | |
197 | if (flavor != RPC_AUTH_NULL && | |
198 | flavor != RPC_AUTH_UNIX && | |
199 | flavor != RPC_AUTH_SHORT) { | |
200 | printk("RPC: bad verf flavor: %u\n", flavor); | |
35fa5f7b | 201 | return ERR_PTR(-EIO); |
1da177e4 LT |
202 | } |
203 | ||
204 | size = ntohl(*p++); | |
205 | if (size > RPC_MAX_AUTH_SIZE) { | |
206 | printk("RPC: giant verf size: %u\n", size); | |
35fa5f7b | 207 | return ERR_PTR(-EIO); |
1da177e4 | 208 | } |
a17c2153 | 209 | task->tk_rqstp->rq_cred->cr_auth->au_rslack = (size >> 2) + 2; |
1da177e4 LT |
210 | p += (size >> 2); |
211 | ||
212 | return p; | |
213 | } | |
214 | ||
5d8d9a4d | 215 | int __init rpc_init_authunix(void) |
9499b434 | 216 | { |
5d8d9a4d TM |
217 | return rpcauth_init_credcache(&unix_auth); |
218 | } | |
219 | ||
220 | void rpc_destroy_authunix(void) | |
221 | { | |
222 | rpcauth_destroy_credcache(&unix_auth); | |
9499b434 TM |
223 | } |
224 | ||
f1c0a861 | 225 | const struct rpc_authops authunix_ops = { |
1da177e4 LT |
226 | .owner = THIS_MODULE, |
227 | .au_flavor = RPC_AUTH_UNIX, | |
1da177e4 | 228 | .au_name = "UNIX", |
1da177e4 LT |
229 | .create = unx_create, |
230 | .destroy = unx_destroy, | |
1e035d06 | 231 | .hash_cred = unx_hash_cred, |
1da177e4 LT |
232 | .lookup_cred = unx_lookup_cred, |
233 | .crcreate = unx_create_cred, | |
234 | }; | |
235 | ||
1da177e4 LT |
236 | static |
237 | struct rpc_auth unix_auth = { | |
4500632f CL |
238 | .au_cslack = UNX_CALLSLACK, |
239 | .au_rslack = NUL_REPLYSLACK, | |
ce52914e | 240 | .au_flags = RPCAUTH_AUTH_NO_CRKEY_TIMEOUT, |
1da177e4 | 241 | .au_ops = &authunix_ops, |
81039f1f | 242 | .au_flavor = RPC_AUTH_UNIX, |
1da177e4 | 243 | .au_count = ATOMIC_INIT(0), |
1da177e4 LT |
244 | }; |
245 | ||
246 | static | |
f1c0a861 | 247 | const struct rpc_credops unix_credops = { |
1da177e4 LT |
248 | .cr_name = "AUTH_UNIX", |
249 | .crdestroy = unx_destroy_cred, | |
5c691044 | 250 | .crbind = rpcauth_generic_bind_cred, |
1da177e4 LT |
251 | .crmatch = unx_match, |
252 | .crmarshal = unx_marshal, | |
253 | .crrefresh = unx_refresh, | |
254 | .crvalidate = unx_validate, | |
255 | }; |