Commit | Line | Data |
---|---|---|
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 | 16 | |
1da177e4 LT |
17 | struct unx_cred { |
18 | struct rpc_cred uc_base; | |
7eaf040b | 19 | kgid_t uc_gid; |
5786461b | 20 | kgid_t uc_gids[UNX_NGROUPS]; |
1da177e4 LT |
21 | }; |
22 | #define uc_uid uc_base.cr_uid | |
1da177e4 | 23 | |
f895b252 | 24 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
1da177e4 LT |
25 | # define RPCDBG_FACILITY RPCDBG_AUTH |
26 | #endif | |
27 | ||
28 | static struct rpc_auth unix_auth; | |
f1c0a861 | 29 | static const struct rpc_credops unix_credops; |
1da177e4 LT |
30 | |
31 | static struct rpc_auth * | |
c2190661 | 32 | unx_create(struct rpc_auth_create_args *args, struct rpc_clnt *clnt) |
1da177e4 | 33 | { |
46121cf7 CL |
34 | dprintk("RPC: creating UNIX authenticator for client %p\n", |
35 | clnt); | |
f5c2187c | 36 | atomic_inc(&unix_auth.au_count); |
1da177e4 LT |
37 | return &unix_auth; |
38 | } | |
39 | ||
40 | static void | |
41 | unx_destroy(struct rpc_auth *auth) | |
42 | { | |
46121cf7 | 43 | dprintk("RPC: destroying UNIX authenticator %p\n", auth); |
3ab9bb72 | 44 | rpcauth_clear_credcache(auth->au_credcache); |
1da177e4 LT |
45 | } |
46 | ||
1e035d06 FS |
47 | static int |
48 | unx_hash_cred(struct auth_cred *acred, unsigned int hashbits) | |
49 | { | |
50 | return hash_64(from_kgid(&init_user_ns, acred->gid) | | |
51 | ((u64)from_kuid(&init_user_ns, acred->uid) << | |
52 | (sizeof(gid_t) * 8)), hashbits); | |
53 | } | |
54 | ||
1da177e4 LT |
55 | /* |
56 | * Lookup AUTH_UNIX creds for current process | |
57 | */ | |
58 | static struct rpc_cred * | |
59 | unx_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) | |
60 | { | |
3c6e0bc8 | 61 | return rpcauth_lookup_credcache(auth, acred, flags, GFP_NOFS); |
1da177e4 LT |
62 | } |
63 | ||
64 | static struct rpc_cred * | |
3c6e0bc8 | 65 | unx_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags, gfp_t gfp) |
1da177e4 LT |
66 | { |
67 | struct unx_cred *cred; | |
af093835 TM |
68 | unsigned int groups = 0; |
69 | unsigned int i; | |
1da177e4 | 70 | |
46121cf7 | 71 | dprintk("RPC: allocating UNIX cred for uid %d gid %d\n", |
cdba321e EB |
72 | from_kuid(&init_user_ns, acred->uid), |
73 | from_kgid(&init_user_ns, acred->gid)); | |
1da177e4 | 74 | |
3c6e0bc8 | 75 | if (!(cred = kmalloc(sizeof(*cred), gfp))) |
1da177e4 LT |
76 | return ERR_PTR(-ENOMEM); |
77 | ||
5fe4755e | 78 | rpcauth_init_cred(&cred->uc_base, acred, auth, &unix_credops); |
fc432dd9 | 79 | cred->uc_base.cr_flags = 1UL << RPCAUTH_CRED_UPTODATE; |
af093835 TM |
80 | |
81 | if (acred->group_info != NULL) | |
82 | groups = acred->group_info->ngroups; | |
5786461b KM |
83 | if (groups > UNX_NGROUPS) |
84 | groups = UNX_NGROUPS; | |
af093835 TM |
85 | |
86 | cred->uc_gid = acred->gid; | |
9132adb0 | 87 | for (i = 0; i < groups; i++) |
81243eac | 88 | cred->uc_gids[i] = acred->group_info->gid[i]; |
5786461b | 89 | if (i < UNX_NGROUPS) |
bf37f794 | 90 | cred->uc_gids[i] = INVALID_GID; |
1da177e4 | 91 | |
696e38df | 92 | return &cred->uc_base; |
1da177e4 LT |
93 | } |
94 | ||
95 | static void | |
31be5bf1 | 96 | unx_free_cred(struct unx_cred *unx_cred) |
1da177e4 | 97 | { |
31be5bf1 TM |
98 | dprintk("RPC: unx_free_cred %p\n", unx_cred); |
99 | kfree(unx_cred); | |
100 | } | |
696e38df | 101 | |
31be5bf1 TM |
102 | static void |
103 | unx_free_cred_callback(struct rcu_head *head) | |
104 | { | |
105 | struct unx_cred *unx_cred = container_of(head, struct unx_cred, uc_base.cr_rcu); | |
106 | unx_free_cred(unx_cred); | |
107 | } | |
108 | ||
109 | static void | |
110 | unx_destroy_cred(struct rpc_cred *cred) | |
111 | { | |
112 | call_rcu(&cred->cr_rcu, unx_free_cred_callback); | |
1da177e4 LT |
113 | } |
114 | ||
115 | /* | |
116 | * Match credentials against current process creds. | |
117 | * The root_override argument takes care of cases where the caller may | |
118 | * request root creds (e.g. for NFS swapping). | |
119 | */ | |
120 | static int | |
8a317760 | 121 | unx_match(struct auth_cred *acred, struct rpc_cred *rcred, int flags) |
1da177e4 | 122 | { |
696e38df | 123 | struct unx_cred *cred = container_of(rcred, struct unx_cred, uc_base); |
af093835 TM |
124 | unsigned int groups = 0; |
125 | unsigned int i; | |
1da177e4 | 126 | |
1da177e4 | 127 | |
0b4d51b0 | 128 | if (!uid_eq(cred->uc_uid, acred->uid) || !gid_eq(cred->uc_gid, acred->gid)) |
af093835 | 129 | return 0; |
1da177e4 | 130 | |
af093835 | 131 | if (acred->group_info != NULL) |
1da177e4 | 132 | groups = acred->group_info->ngroups; |
5786461b KM |
133 | if (groups > UNX_NGROUPS) |
134 | groups = UNX_NGROUPS; | |
9132adb0 | 135 | for (i = 0; i < groups ; i++) |
81243eac | 136 | if (!gid_eq(cred->uc_gids[i], acred->group_info->gid[i])) |
af093835 | 137 | return 0; |
5786461b | 138 | if (groups < UNX_NGROUPS && gid_valid(cred->uc_gids[groups])) |
dc6f55e9 | 139 | return 0; |
af093835 | 140 | return 1; |
1da177e4 LT |
141 | } |
142 | ||
143 | /* | |
144 | * Marshal credentials. | |
145 | * Maybe we should keep a cached credential for performance reasons. | |
146 | */ | |
d8ed029d AD |
147 | static __be32 * |
148 | unx_marshal(struct rpc_task *task, __be32 *p) | |
1da177e4 LT |
149 | { |
150 | struct rpc_clnt *clnt = task->tk_client; | |
a17c2153 | 151 | struct unx_cred *cred = container_of(task->tk_rqstp->rq_cred, struct unx_cred, uc_base); |
d8ed029d | 152 | __be32 *base, *hold; |
1da177e4 LT |
153 | int i; |
154 | ||
155 | *p++ = htonl(RPC_AUTH_UNIX); | |
156 | base = p++; | |
157 | *p++ = htonl(jiffies/HZ); | |
158 | ||
159 | /* | |
160 | * Copy the UTS nodename captured when the client was created. | |
161 | */ | |
162 | p = xdr_encode_array(p, clnt->cl_nodename, clnt->cl_nodelen); | |
163 | ||
a570abbb EB |
164 | *p++ = htonl((u32) from_kuid(&init_user_ns, cred->uc_uid)); |
165 | *p++ = htonl((u32) from_kgid(&init_user_ns, cred->uc_gid)); | |
1da177e4 | 166 | hold = p++; |
5786461b | 167 | for (i = 0; i < UNX_NGROUPS && gid_valid(cred->uc_gids[i]); i++) |
a570abbb | 168 | *p++ = htonl((u32) from_kgid(&init_user_ns, cred->uc_gids[i])); |
1da177e4 LT |
169 | *hold = htonl(p - hold - 1); /* gid array length */ |
170 | *base = htonl((p - base - 1) << 2); /* cred length */ | |
171 | ||
172 | *p++ = htonl(RPC_AUTH_NULL); | |
173 | *p++ = htonl(0); | |
174 | ||
175 | return p; | |
176 | } | |
177 | ||
178 | /* | |
179 | * Refresh credentials. This is a no-op for AUTH_UNIX | |
180 | */ | |
181 | static int | |
182 | unx_refresh(struct rpc_task *task) | |
183 | { | |
a17c2153 | 184 | set_bit(RPCAUTH_CRED_UPTODATE, &task->tk_rqstp->rq_cred->cr_flags); |
1da177e4 LT |
185 | return 0; |
186 | } | |
187 | ||
d8ed029d AD |
188 | static __be32 * |
189 | unx_validate(struct rpc_task *task, __be32 *p) | |
1da177e4 LT |
190 | { |
191 | rpc_authflavor_t flavor; | |
192 | u32 size; | |
193 | ||
194 | flavor = ntohl(*p++); | |
195 | if (flavor != RPC_AUTH_NULL && | |
196 | flavor != RPC_AUTH_UNIX && | |
197 | flavor != RPC_AUTH_SHORT) { | |
198 | printk("RPC: bad verf flavor: %u\n", flavor); | |
35fa5f7b | 199 | return ERR_PTR(-EIO); |
1da177e4 LT |
200 | } |
201 | ||
202 | size = ntohl(*p++); | |
203 | if (size > RPC_MAX_AUTH_SIZE) { | |
204 | printk("RPC: giant verf size: %u\n", size); | |
35fa5f7b | 205 | return ERR_PTR(-EIO); |
1da177e4 | 206 | } |
a17c2153 | 207 | task->tk_rqstp->rq_cred->cr_auth->au_rslack = (size >> 2) + 2; |
1da177e4 LT |
208 | p += (size >> 2); |
209 | ||
210 | return p; | |
211 | } | |
212 | ||
5d8d9a4d | 213 | int __init rpc_init_authunix(void) |
9499b434 | 214 | { |
5d8d9a4d TM |
215 | return rpcauth_init_credcache(&unix_auth); |
216 | } | |
217 | ||
218 | void rpc_destroy_authunix(void) | |
219 | { | |
220 | rpcauth_destroy_credcache(&unix_auth); | |
9499b434 TM |
221 | } |
222 | ||
f1c0a861 | 223 | const struct rpc_authops authunix_ops = { |
1da177e4 LT |
224 | .owner = THIS_MODULE, |
225 | .au_flavor = RPC_AUTH_UNIX, | |
1da177e4 | 226 | .au_name = "UNIX", |
1da177e4 LT |
227 | .create = unx_create, |
228 | .destroy = unx_destroy, | |
1e035d06 | 229 | .hash_cred = unx_hash_cred, |
1da177e4 LT |
230 | .lookup_cred = unx_lookup_cred, |
231 | .crcreate = unx_create_cred, | |
232 | }; | |
233 | ||
1da177e4 LT |
234 | static |
235 | struct rpc_auth unix_auth = { | |
4500632f CL |
236 | .au_cslack = UNX_CALLSLACK, |
237 | .au_rslack = NUL_REPLYSLACK, | |
ce52914e | 238 | .au_flags = RPCAUTH_AUTH_NO_CRKEY_TIMEOUT, |
1da177e4 | 239 | .au_ops = &authunix_ops, |
81039f1f | 240 | .au_flavor = RPC_AUTH_UNIX, |
1da177e4 | 241 | .au_count = ATOMIC_INIT(0), |
1da177e4 LT |
242 | }; |
243 | ||
244 | static | |
f1c0a861 | 245 | const struct rpc_credops unix_credops = { |
1da177e4 LT |
246 | .cr_name = "AUTH_UNIX", |
247 | .crdestroy = unx_destroy_cred, | |
5c691044 | 248 | .crbind = rpcauth_generic_bind_cred, |
1da177e4 LT |
249 | .crmatch = unx_match, |
250 | .crmarshal = unx_marshal, | |
251 | .crrefresh = unx_refresh, | |
252 | .crvalidate = unx_validate, | |
253 | }; |