blob: e010a015d99671f27a22573a31eae75ae6cda955 [file] [log] [blame]
Trond Myklebust9a559ef2008-03-12 12:24:49 -04001/*
2 * Generic RPC credential
3 *
4 * Copyright (C) 2008, Trond Myklebust <Trond.Myklebust@netapp.com>
5 */
6
7#include <linux/err.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +09008#include <linux/slab.h>
Trond Myklebust9a559ef2008-03-12 12:24:49 -04009#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
Trond Myklebustb4528762008-05-11 12:18:51 -070021#define RPC_MACHINE_CRED_USERID ((uid_t)0)
22#define RPC_MACHINE_CRED_GROUPID ((gid_t)0)
Trond Myklebust7c67db32008-04-07 20:50:11 -040023
Trond Myklebust9a559ef2008-03-12 12:24:49 -040024struct generic_cred {
25 struct rpc_cred gc_base;
26 struct auth_cred acred;
27};
28
29static struct rpc_auth generic_auth;
Trond Myklebust9a559ef2008-03-12 12:24:49 -040030static const struct rpc_credops generic_credops;
31
32/*
33 * Public call interface
34 */
35struct rpc_cred *rpc_lookup_cred(void)
36{
37 return rpcauth_lookupcred(&generic_auth, 0);
38}
39EXPORT_SYMBOL_GPL(rpc_lookup_cred);
40
Trond Myklebust7c67db32008-04-07 20:50:11 -040041/*
42 * Public call interface for looking up machine creds.
43 */
44struct rpc_cred *rpc_lookup_machine_cred(void)
45{
46 struct auth_cred acred = {
Trond Myklebustb4528762008-05-11 12:18:51 -070047 .uid = RPC_MACHINE_CRED_USERID,
48 .gid = RPC_MACHINE_CRED_GROUPID,
Trond Myklebust7c67db32008-04-07 20:50:11 -040049 .machine_cred = 1,
50 };
51
52 dprintk("RPC: looking up machine cred\n");
53 return generic_auth.au_ops->lookup_cred(&generic_auth, &acred, 0);
54}
55EXPORT_SYMBOL_GPL(rpc_lookup_machine_cred);
56
Trond Myklebust8572b8e2010-07-31 14:29:08 -040057static struct rpc_cred *generic_bind_cred(struct rpc_task *task,
58 struct rpc_cred *cred, int lookupflags)
Trond Myklebust5c691042008-03-12 16:21:07 -040059{
60 struct rpc_auth *auth = task->tk_client->cl_auth;
61 struct auth_cred *acred = &container_of(cred, struct generic_cred, gc_base)->acred;
Trond Myklebust5c691042008-03-12 16:21:07 -040062
Trond Myklebust8572b8e2010-07-31 14:29:08 -040063 return auth->au_ops->lookup_cred(auth, acred, lookupflags);
Trond Myklebust5c691042008-03-12 16:21:07 -040064}
65
Trond Myklebust9a559ef2008-03-12 12:24:49 -040066/*
67 * Lookup generic creds for current process
68 */
69static struct rpc_cred *
70generic_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
71{
72 return rpcauth_lookup_credcache(&generic_auth, acred, flags);
73}
74
75static struct rpc_cred *
76generic_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
77{
78 struct generic_cred *gcred;
79
80 gcred = kmalloc(sizeof(*gcred), GFP_KERNEL);
81 if (gcred == NULL)
82 return ERR_PTR(-ENOMEM);
83
84 rpcauth_init_cred(&gcred->gc_base, acred, &generic_auth, &generic_credops);
85 gcred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_UPTODATE;
86
87 gcred->acred.uid = acred->uid;
88 gcred->acred.gid = acred->gid;
89 gcred->acred.group_info = acred->group_info;
90 if (gcred->acred.group_info != NULL)
91 get_group_info(gcred->acred.group_info);
Trond Myklebust7c67db32008-04-07 20:50:11 -040092 gcred->acred.machine_cred = acred->machine_cred;
Trond Myklebust9a559ef2008-03-12 12:24:49 -040093
Trond Myklebust7c67db32008-04-07 20:50:11 -040094 dprintk("RPC: allocated %s cred %p for uid %d gid %d\n",
95 gcred->acred.machine_cred ? "machine" : "generic",
Trond Myklebust9a559ef2008-03-12 12:24:49 -040096 gcred, acred->uid, acred->gid);
97 return &gcred->gc_base;
98}
99
100static void
101generic_free_cred(struct rpc_cred *cred)
102{
103 struct generic_cred *gcred = container_of(cred, struct generic_cred, gc_base);
104
105 dprintk("RPC: generic_free_cred %p\n", gcred);
106 if (gcred->acred.group_info != NULL)
107 put_group_info(gcred->acred.group_info);
108 kfree(gcred);
109}
110
111static void
112generic_free_cred_callback(struct rcu_head *head)
113{
114 struct rpc_cred *cred = container_of(head, struct rpc_cred, cr_rcu);
115 generic_free_cred(cred);
116}
117
118static void
119generic_destroy_cred(struct rpc_cred *cred)
120{
121 call_rcu(&cred->cr_rcu, generic_free_cred_callback);
122}
123
124/*
125 * Match credentials against current process creds.
126 */
127static int
128generic_match(struct auth_cred *acred, struct rpc_cred *cred, int flags)
129{
130 struct generic_cred *gcred = container_of(cred, struct generic_cred, gc_base);
Trond Myklebust23918b02008-11-20 16:06:21 -0500131 int i;
Trond Myklebust9a559ef2008-03-12 12:24:49 -0400132
133 if (gcred->acred.uid != acred->uid ||
134 gcred->acred.gid != acred->gid ||
Trond Myklebust7c67db32008-04-07 20:50:11 -0400135 gcred->acred.machine_cred != acred->machine_cred)
Trond Myklebust23918b02008-11-20 16:06:21 -0500136 goto out_nomatch;
137
138 /* Optimisation in the case where pointers are identical... */
139 if (gcred->acred.group_info == acred->group_info)
140 goto out_match;
141
142 /* Slow path... */
143 if (gcred->acred.group_info->ngroups != acred->group_info->ngroups)
144 goto out_nomatch;
145 for (i = 0; i < gcred->acred.group_info->ngroups; i++) {
146 if (GROUP_AT(gcred->acred.group_info, i) !=
147 GROUP_AT(acred->group_info, i))
148 goto out_nomatch;
149 }
150out_match:
Trond Myklebust9a559ef2008-03-12 12:24:49 -0400151 return 1;
Trond Myklebust23918b02008-11-20 16:06:21 -0500152out_nomatch:
153 return 0;
Trond Myklebust9a559ef2008-03-12 12:24:49 -0400154}
155
Trond Myklebust5d8d9a4d2010-07-31 14:29:07 -0400156int __init rpc_init_generic_auth(void)
Trond Myklebust9a559ef2008-03-12 12:24:49 -0400157{
Trond Myklebust5d8d9a4d2010-07-31 14:29:07 -0400158 return rpcauth_init_credcache(&generic_auth);
Trond Myklebust9a559ef2008-03-12 12:24:49 -0400159}
160
Stephen Rothwellc135e842010-09-29 14:16:57 +1000161void rpc_destroy_generic_auth(void)
Trond Myklebust9a559ef2008-03-12 12:24:49 -0400162{
Trond Myklebust5d8d9a4d2010-07-31 14:29:07 -0400163 rpcauth_destroy_credcache(&generic_auth);
Trond Myklebust9a559ef2008-03-12 12:24:49 -0400164}
165
Trond Myklebust9a559ef2008-03-12 12:24:49 -0400166static const struct rpc_authops generic_auth_ops = {
167 .owner = THIS_MODULE,
Trond Myklebust9a559ef2008-03-12 12:24:49 -0400168 .au_name = "Generic",
Trond Myklebust9a559ef2008-03-12 12:24:49 -0400169 .lookup_cred = generic_lookup_cred,
170 .crcreate = generic_create_cred,
171};
172
173static struct rpc_auth generic_auth = {
174 .au_ops = &generic_auth_ops,
175 .au_count = ATOMIC_INIT(0),
Trond Myklebust9a559ef2008-03-12 12:24:49 -0400176};
177
178static const struct rpc_credops generic_credops = {
179 .cr_name = "Generic cred",
180 .crdestroy = generic_destroy_cred,
Trond Myklebust5c691042008-03-12 16:21:07 -0400181 .crbind = generic_bind_cred,
Trond Myklebust9a559ef2008-03-12 12:24:49 -0400182 .crmatch = generic_match,
183};