Commit | Line | Data |
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9a559efd TM |
1 | /* |
2 | * Generic RPC credential | |
3 | * | |
4 | * Copyright (C) 2008, Trond Myklebust <Trond.Myklebust@netapp.com> | |
5 | */ | |
6 | ||
7 | #include <linux/err.h> | |
5a0e3ad6 | 8 | #include <linux/slab.h> |
9a559efd TM |
9 | #include <linux/types.h> |
10 | #include <linux/module.h> | |
11 | #include <linux/sched.h> | |
12 | #include <linux/sunrpc/auth.h> | |
13 | #include <linux/sunrpc/clnt.h> | |
14 | #include <linux/sunrpc/debug.h> | |
15 | #include <linux/sunrpc/sched.h> | |
16 | ||
17 | #ifdef RPC_DEBUG | |
18 | # define RPCDBG_FACILITY RPCDBG_AUTH | |
19 | #endif | |
20 | ||
bf37f794 EB |
21 | #define RPC_MACHINE_CRED_USERID GLOBAL_ROOT_UID |
22 | #define RPC_MACHINE_CRED_GROUPID GLOBAL_ROOT_GID | |
7c67db3a | 23 | |
9a559efd TM |
24 | struct generic_cred { |
25 | struct rpc_cred gc_base; | |
26 | struct auth_cred acred; | |
27 | }; | |
28 | ||
29 | static struct rpc_auth generic_auth; | |
9a559efd TM |
30 | static const struct rpc_credops generic_credops; |
31 | ||
32 | /* | |
33 | * Public call interface | |
34 | */ | |
35 | struct rpc_cred *rpc_lookup_cred(void) | |
36 | { | |
37 | return rpcauth_lookupcred(&generic_auth, 0); | |
38 | } | |
39 | EXPORT_SYMBOL_GPL(rpc_lookup_cred); | |
40 | ||
7c67db3a TM |
41 | /* |
42 | * Public call interface for looking up machine creds. | |
43 | */ | |
68c97153 | 44 | struct rpc_cred *rpc_lookup_machine_cred(const char *service_name) |
7c67db3a TM |
45 | { |
46 | struct auth_cred acred = { | |
b4528762 TM |
47 | .uid = RPC_MACHINE_CRED_USERID, |
48 | .gid = RPC_MACHINE_CRED_GROUPID, | |
68c97153 | 49 | .principal = service_name, |
7c67db3a TM |
50 | .machine_cred = 1, |
51 | }; | |
52 | ||
68c97153 TM |
53 | dprintk("RPC: looking up machine cred for service %s\n", |
54 | service_name); | |
7c67db3a TM |
55 | return generic_auth.au_ops->lookup_cred(&generic_auth, &acred, 0); |
56 | } | |
57 | EXPORT_SYMBOL_GPL(rpc_lookup_machine_cred); | |
58 | ||
8572b8e2 TM |
59 | static struct rpc_cred *generic_bind_cred(struct rpc_task *task, |
60 | struct rpc_cred *cred, int lookupflags) | |
5c691044 TM |
61 | { |
62 | struct rpc_auth *auth = task->tk_client->cl_auth; | |
63 | struct auth_cred *acred = &container_of(cred, struct generic_cred, gc_base)->acred; | |
5c691044 | 64 | |
8572b8e2 | 65 | return auth->au_ops->lookup_cred(auth, acred, lookupflags); |
5c691044 TM |
66 | } |
67 | ||
9a559efd TM |
68 | /* |
69 | * Lookup generic creds for current process | |
70 | */ | |
71 | static struct rpc_cred * | |
72 | generic_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) | |
73 | { | |
74 | return rpcauth_lookup_credcache(&generic_auth, acred, flags); | |
75 | } | |
76 | ||
77 | static struct rpc_cred * | |
78 | generic_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) | |
79 | { | |
80 | struct generic_cred *gcred; | |
81 | ||
82 | gcred = kmalloc(sizeof(*gcred), GFP_KERNEL); | |
83 | if (gcred == NULL) | |
84 | return ERR_PTR(-ENOMEM); | |
85 | ||
86 | rpcauth_init_cred(&gcred->gc_base, acred, &generic_auth, &generic_credops); | |
87 | gcred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_UPTODATE; | |
88 | ||
89 | gcred->acred.uid = acred->uid; | |
90 | gcred->acred.gid = acred->gid; | |
91 | gcred->acred.group_info = acred->group_info; | |
92 | if (gcred->acred.group_info != NULL) | |
93 | get_group_info(gcred->acred.group_info); | |
7c67db3a | 94 | gcred->acred.machine_cred = acred->machine_cred; |
875ad3f8 | 95 | gcred->acred.principal = acred->principal; |
9a559efd | 96 | |
7c67db3a TM |
97 | dprintk("RPC: allocated %s cred %p for uid %d gid %d\n", |
98 | gcred->acred.machine_cred ? "machine" : "generic", | |
cdba321e EB |
99 | gcred, |
100 | from_kuid(&init_user_ns, acred->uid), | |
101 | from_kgid(&init_user_ns, acred->gid)); | |
9a559efd TM |
102 | return &gcred->gc_base; |
103 | } | |
104 | ||
105 | static void | |
106 | generic_free_cred(struct rpc_cred *cred) | |
107 | { | |
108 | struct generic_cred *gcred = container_of(cred, struct generic_cred, gc_base); | |
109 | ||
110 | dprintk("RPC: generic_free_cred %p\n", gcred); | |
111 | if (gcred->acred.group_info != NULL) | |
112 | put_group_info(gcred->acred.group_info); | |
113 | kfree(gcred); | |
114 | } | |
115 | ||
116 | static void | |
117 | generic_free_cred_callback(struct rcu_head *head) | |
118 | { | |
119 | struct rpc_cred *cred = container_of(head, struct rpc_cred, cr_rcu); | |
120 | generic_free_cred(cred); | |
121 | } | |
122 | ||
123 | static void | |
124 | generic_destroy_cred(struct rpc_cred *cred) | |
125 | { | |
126 | call_rcu(&cred->cr_rcu, generic_free_cred_callback); | |
127 | } | |
128 | ||
875ad3f8 TM |
129 | static int |
130 | machine_cred_match(struct auth_cred *acred, struct generic_cred *gcred, int flags) | |
131 | { | |
132 | if (!gcred->acred.machine_cred || | |
133 | gcred->acred.principal != acred->principal || | |
0b4d51b0 EB |
134 | !uid_eq(gcred->acred.uid, acred->uid) || |
135 | !gid_eq(gcred->acred.gid, acred->gid)) | |
875ad3f8 TM |
136 | return 0; |
137 | return 1; | |
138 | } | |
139 | ||
9a559efd TM |
140 | /* |
141 | * Match credentials against current process creds. | |
142 | */ | |
143 | static int | |
144 | generic_match(struct auth_cred *acred, struct rpc_cred *cred, int flags) | |
145 | { | |
146 | struct generic_cred *gcred = container_of(cred, struct generic_cred, gc_base); | |
23918b03 | 147 | int i; |
9a559efd | 148 | |
875ad3f8 TM |
149 | if (acred->machine_cred) |
150 | return machine_cred_match(acred, gcred, flags); | |
151 | ||
0b4d51b0 EB |
152 | if (!uid_eq(gcred->acred.uid, acred->uid) || |
153 | !gid_eq(gcred->acred.gid, acred->gid) || | |
875ad3f8 | 154 | gcred->acred.machine_cred != 0) |
23918b03 TM |
155 | goto out_nomatch; |
156 | ||
157 | /* Optimisation in the case where pointers are identical... */ | |
158 | if (gcred->acred.group_info == acred->group_info) | |
159 | goto out_match; | |
160 | ||
161 | /* Slow path... */ | |
162 | if (gcred->acred.group_info->ngroups != acred->group_info->ngroups) | |
163 | goto out_nomatch; | |
164 | for (i = 0; i < gcred->acred.group_info->ngroups; i++) { | |
ae2975bc EB |
165 | if (!gid_eq(GROUP_AT(gcred->acred.group_info, i), |
166 | GROUP_AT(acred->group_info, i))) | |
23918b03 TM |
167 | goto out_nomatch; |
168 | } | |
169 | out_match: | |
9a559efd | 170 | return 1; |
23918b03 TM |
171 | out_nomatch: |
172 | return 0; | |
9a559efd TM |
173 | } |
174 | ||
5d8d9a4d | 175 | int __init rpc_init_generic_auth(void) |
9a559efd | 176 | { |
5d8d9a4d | 177 | return rpcauth_init_credcache(&generic_auth); |
9a559efd TM |
178 | } |
179 | ||
c135e84a | 180 | void rpc_destroy_generic_auth(void) |
9a559efd | 181 | { |
5d8d9a4d | 182 | rpcauth_destroy_credcache(&generic_auth); |
9a559efd TM |
183 | } |
184 | ||
9a559efd TM |
185 | static const struct rpc_authops generic_auth_ops = { |
186 | .owner = THIS_MODULE, | |
9a559efd | 187 | .au_name = "Generic", |
9a559efd TM |
188 | .lookup_cred = generic_lookup_cred, |
189 | .crcreate = generic_create_cred, | |
190 | }; | |
191 | ||
192 | static struct rpc_auth generic_auth = { | |
193 | .au_ops = &generic_auth_ops, | |
194 | .au_count = ATOMIC_INIT(0), | |
9a559efd TM |
195 | }; |
196 | ||
197 | static const struct rpc_credops generic_credops = { | |
198 | .cr_name = "Generic cred", | |
199 | .crdestroy = generic_destroy_cred, | |
5c691044 | 200 | .crbind = generic_bind_cred, |
9a559efd TM |
201 | .crmatch = generic_match, |
202 | }; |