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hc
2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376 
 kernel/net/sunrpc/auth_unix.c
....@@ -11,16 +11,11 @@
1111 #include <linux/types.h>
1212 #include <linux/sched.h>
1313 #include <linux/module.h>
14
+#include <linux/mempool.h>
1415 #include <linux/sunrpc/clnt.h>
1516 #include <linux/sunrpc/auth.h>
1617 #include <linux/user_namespace.h>
1718 
18
-struct unx_cred {
19
-	struct rpc_cred		uc_base;
20
-	kgid_t			uc_gid;
21
-	kgid_t			uc_gids[UNX_NGROUPS];
22
-};
23
-#define uc_uid			uc_base.cr_uid
2419 
2520 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
2621 # define RPCDBG_FACILITY	RPCDBG_AUTH
....@@ -28,29 +23,18 @@
2823 
2924 static struct rpc_auth		unix_auth;
3025 static const struct rpc_credops	unix_credops;
26
+static mempool_t		*unix_pool;
3127 
3228 static struct rpc_auth *
3329 unx_create(const struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
3430 {
35
-	dprintk("RPC:       creating UNIX authenticator for client %p\n",
36
-			clnt);
37
-	atomic_inc(&unix_auth.au_count);
31
+	refcount_inc(&unix_auth.au_count);
3832 	return &unix_auth;
3933 }
4034 
4135 static void
4236 unx_destroy(struct rpc_auth *auth)
4337 {
44
-	dprintk("RPC:       destroying UNIX authenticator %p\n", auth);
45
-	rpcauth_clear_credcache(auth->au_credcache);
46
-}
47
-
48
-static int
49
-unx_hash_cred(struct auth_cred *acred, unsigned int hashbits)
50
-{
51
-	return hash_64(from_kgid(&init_user_ns, acred->gid) |
52
-		((u64)from_kuid(&init_user_ns, acred->uid) <<
53
-			(sizeof(gid_t) * 8)), hashbits);
5438 }
5539 
5640 /*
....@@ -59,52 +43,20 @@
5943 static struct rpc_cred *
6044 unx_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
6145 {
62
-	return rpcauth_lookup_credcache(auth, acred, flags, GFP_NOFS);
63
-}
46
+	struct rpc_cred *ret = mempool_alloc(unix_pool, GFP_NOFS);
6447 
65
-static struct rpc_cred *
66
-unx_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags, gfp_t gfp)
67
-{
68
-	struct unx_cred	*cred;
69
-	unsigned int groups = 0;
70
-	unsigned int i;
71
-
72
-	dprintk("RPC:       allocating UNIX cred for uid %d gid %d\n",
73
-			from_kuid(&init_user_ns, acred->uid),
74
-			from_kgid(&init_user_ns, acred->gid));
75
-
76
-	if (!(cred = kmalloc(sizeof(*cred), gfp)))
77
-		return ERR_PTR(-ENOMEM);
78
-
79
-	rpcauth_init_cred(&cred->uc_base, acred, auth, &unix_credops);
80
-	cred->uc_base.cr_flags = 1UL << RPCAUTH_CRED_UPTODATE;
81
-
82
-	if (acred->group_info != NULL)
83
-		groups = acred->group_info->ngroups;
84
-	if (groups > UNX_NGROUPS)
85
-		groups = UNX_NGROUPS;
86
-
87
-	cred->uc_gid = acred->gid;
88
-	for (i = 0; i < groups; i++)
89
-		cred->uc_gids[i] = acred->group_info->gid[i];
90
-	if (i < UNX_NGROUPS)
91
-		cred->uc_gids[i] = INVALID_GID;
92
-
93
-	return &cred->uc_base;
94
-}
95
-
96
-static void
97
-unx_free_cred(struct unx_cred *unx_cred)
98
-{
99
-	dprintk("RPC:       unx_free_cred %p\n", unx_cred);
100
-	kfree(unx_cred);
48
+	rpcauth_init_cred(ret, acred, auth, &unix_credops);
49
+	ret->cr_flags = 1UL << RPCAUTH_CRED_UPTODATE;
50
+	return ret;
10151 }
10252 
10353 static void
10454 unx_free_cred_callback(struct rcu_head *head)
10555 {
106
-	struct unx_cred *unx_cred = container_of(head, struct unx_cred, uc_base.cr_rcu);
107
-	unx_free_cred(unx_cred);
56
+	struct rpc_cred *rpc_cred = container_of(head, struct rpc_cred, cr_rcu);
57
+
58
+	put_cred(rpc_cred->cr_cred);
59
+	mempool_free(rpc_cred, unix_pool);
10860 }
10961 
11062 static void
....@@ -114,30 +66,32 @@
11466 }
11567 
11668 /*
117
- * Match credentials against current process creds.
118
- * The root_override argument takes care of cases where the caller may
119
- * request root creds (e.g. for NFS swapping).
69
+ * Match credentials against current the auth_cred.
12070  */
12171 static int
122
-unx_match(struct auth_cred *acred, struct rpc_cred *rcred, int flags)
72
+unx_match(struct auth_cred *acred, struct rpc_cred *cred, int flags)
12373 {
124
-	struct unx_cred	*cred = container_of(rcred, struct unx_cred, uc_base);
12574 	unsigned int groups = 0;
12675 	unsigned int i;
12776 
77
+	if (cred->cr_cred == acred->cred)
78
+		return 1;
12879 
129
-	if (!uid_eq(cred->uc_uid, acred->uid) || !gid_eq(cred->uc_gid, acred->gid))
80
+	if (!uid_eq(cred->cr_cred->fsuid, acred->cred->fsuid) || !gid_eq(cred->cr_cred->fsgid, acred->cred->fsgid))
13081 		return 0;
13182 
132
-	if (acred->group_info != NULL)
133
-		groups = acred->group_info->ngroups;
83
+	if (acred->cred->group_info != NULL)
84
+		groups = acred->cred->group_info->ngroups;
13485 	if (groups > UNX_NGROUPS)
13586 		groups = UNX_NGROUPS;
136
-	for (i = 0; i < groups ; i++)
137
-		if (!gid_eq(cred->uc_gids[i], acred->group_info->gid[i]))
138
-			return 0;
139
-	if (groups < UNX_NGROUPS && gid_valid(cred->uc_gids[groups]))
87
+	if (cred->cr_cred->group_info == NULL)
88
+		return groups == 0;
89
+	if (groups != cred->cr_cred->group_info->ngroups)
14090 		return 0;
91
+
92
+	for (i = 0; i < groups ; i++)
93
+		if (!gid_eq(cred->cr_cred->group_info->gid[i], acred->cred->group_info->gid[i]))
94
+			return 0;
14195 	return 1;
14296 }
14397 
....@@ -145,35 +99,56 @@
14599  * Marshal credentials.
146100  * Maybe we should keep a cached credential for performance reasons.
147101  */
148
-static __be32 *
149
-unx_marshal(struct rpc_task *task, __be32 *p)
102
+static int
103
+unx_marshal(struct rpc_task *task, struct xdr_stream *xdr)
150104 {
151105 	struct rpc_clnt	*clnt = task->tk_client;
152
-	struct unx_cred	*cred = container_of(task->tk_rqstp->rq_cred, struct unx_cred, uc_base);
153
-	__be32		*base, *hold;
106
+	struct rpc_cred	*cred = task->tk_rqstp->rq_cred;
107
+	__be32		*p, *cred_len, *gidarr_len;
154108 	int		i;
109
+	struct group_info *gi = cred->cr_cred->group_info;
110
+	struct user_namespace *userns = clnt->cl_cred ?
111
+		clnt->cl_cred->user_ns : &init_user_ns;
155112 
156
-	*p++ = htonl(RPC_AUTH_UNIX);
157
-	base = p++;
158
-	*p++ = htonl(jiffies/HZ);
113
+	/* Credential */
159114 
160
-	/*
161
-	 * Copy the UTS nodename captured when the client was created.
162
-	 */
163
-	p = xdr_encode_array(p, clnt->cl_nodename, clnt->cl_nodelen);
115
+	p = xdr_reserve_space(xdr, 3 * sizeof(*p));
116
+	if (!p)
117
+		goto marshal_failed;
118
+	*p++ = rpc_auth_unix;
119
+	cred_len = p++;
120
+	*p++ = xdr_zero;	/* stamp */
121
+	if (xdr_stream_encode_opaque(xdr, clnt->cl_nodename,
122
+				     clnt->cl_nodelen) < 0)
123
+		goto marshal_failed;
124
+	p = xdr_reserve_space(xdr, 3 * sizeof(*p));
125
+	if (!p)
126
+		goto marshal_failed;
127
+	*p++ = cpu_to_be32(from_kuid_munged(userns, cred->cr_cred->fsuid));
128
+	*p++ = cpu_to_be32(from_kgid_munged(userns, cred->cr_cred->fsgid));
164129 
165
-	*p++ = htonl((u32) from_kuid(&init_user_ns, cred->uc_uid));
166
-	*p++ = htonl((u32) from_kgid(&init_user_ns, cred->uc_gid));
167
-	hold = p++;
168
-	for (i = 0; i < UNX_NGROUPS && gid_valid(cred->uc_gids[i]); i++)
169
-		*p++ = htonl((u32) from_kgid(&init_user_ns, cred->uc_gids[i]));
170
-	*hold = htonl(p - hold - 1);		/* gid array length */
171
-	*base = htonl((p - base - 1) << 2);	/* cred length */
130
+	gidarr_len = p++;
131
+	if (gi)
132
+		for (i = 0; i < UNX_NGROUPS && i < gi->ngroups; i++)
133
+			*p++ = cpu_to_be32(from_kgid_munged(userns, gi->gid[i]));
134
+	*gidarr_len = cpu_to_be32(p - gidarr_len - 1);
135
+	*cred_len = cpu_to_be32((p - cred_len - 1) << 2);
136
+	p = xdr_reserve_space(xdr, (p - gidarr_len - 1) << 2);
137
+	if (!p)
138
+		goto marshal_failed;
172139 
173
-	*p++ = htonl(RPC_AUTH_NULL);
174
-	*p++ = htonl(0);
140
+	/* Verifier */
175141 
176
-	return p;
142
+	p = xdr_reserve_space(xdr, 2 * sizeof(*p));
143
+	if (!p)
144
+		goto marshal_failed;
145
+	*p++ = rpc_auth_null;
146
+	*p   = xdr_zero;
147
+
148
+	return 0;
149
+
150
+marshal_failed:
151
+	return -EMSGSIZE;
177152 }
178153 
179154 /*
....@@ -186,39 +161,46 @@
186161 	return 0;
187162 }
188163 
189
-static __be32 *
190
-unx_validate(struct rpc_task *task, __be32 *p)
164
+static int
165
+unx_validate(struct rpc_task *task, struct xdr_stream *xdr)
191166 {
192
-	rpc_authflavor_t	flavor;
193
-	u32			size;
167
+	struct rpc_auth *auth = task->tk_rqstp->rq_cred->cr_auth;
168
+	__be32 *p;
169
+	u32 size;
194170 
195
-	flavor = ntohl(*p++);
196
-	if (flavor != RPC_AUTH_NULL &&
197
-	    flavor != RPC_AUTH_UNIX &&
198
-	    flavor != RPC_AUTH_SHORT) {
199
-		printk("RPC: bad verf flavor: %u\n", flavor);
200
-		return ERR_PTR(-EIO);
171
+	p = xdr_inline_decode(xdr, 2 * sizeof(*p));
172
+	if (!p)
173
+		return -EIO;
174
+	switch (*p++) {
175
+	case rpc_auth_null:
176
+	case rpc_auth_unix:
177
+	case rpc_auth_short:
178
+		break;
179
+	default:
180
+		return -EIO;
201181 	}
182
+	size = be32_to_cpup(p);
183
+	if (size > RPC_MAX_AUTH_SIZE)
184
+		return -EIO;
185
+	p = xdr_inline_decode(xdr, size);
186
+	if (!p)
187
+		return -EIO;
202188 
203
-	size = ntohl(*p++);
204
-	if (size > RPC_MAX_AUTH_SIZE) {
205
-		printk("RPC: giant verf size: %u\n", size);
206
-		return ERR_PTR(-EIO);
207
-	}
208
-	task->tk_rqstp->rq_cred->cr_auth->au_rslack = (size >> 2) + 2;
209
-	p += (size >> 2);
210
-
211
-	return p;
189
+	auth->au_verfsize = XDR_QUADLEN(size) + 2;
190
+	auth->au_rslack = XDR_QUADLEN(size) + 2;
191
+	auth->au_ralign = XDR_QUADLEN(size) + 2;
192
+	return 0;
212193 }
213194 
214195 int __init rpc_init_authunix(void)
215196 {
216
-	return rpcauth_init_credcache(&unix_auth);
197
+	unix_pool = mempool_create_kmalloc_pool(16, sizeof(struct rpc_cred));
198
+	return unix_pool ? 0 : -ENOMEM;
217199 }
218200 
219201 void rpc_destroy_authunix(void)
220202 {
221
-	rpcauth_destroy_credcache(&unix_auth);
203
+	mempool_destroy(unix_pool);
222204 }
223205 
224206 const struct rpc_authops authunix_ops = {
....@@ -227,28 +209,27 @@
227209 	.au_name	= "UNIX",
228210 	.create		= unx_create,
229211 	.destroy	= unx_destroy,
230
-	.hash_cred	= unx_hash_cred,
231212 	.lookup_cred	= unx_lookup_cred,
232
-	.crcreate	= unx_create_cred,
233213 };
234214 
235215 static
236216 struct rpc_auth		unix_auth = {
237217 	.au_cslack	= UNX_CALLSLACK,
238218 	.au_rslack	= NUL_REPLYSLACK,
239
-	.au_flags	= RPCAUTH_AUTH_NO_CRKEY_TIMEOUT,
219
+	.au_verfsize	= NUL_REPLYSLACK,
240220 	.au_ops		= &authunix_ops,
241221 	.au_flavor	= RPC_AUTH_UNIX,
242
-	.au_count	= ATOMIC_INIT(0),
222
+	.au_count	= REFCOUNT_INIT(1),
243223 };
244224 
245225 static
246226 const struct rpc_credops unix_credops = {
247227 	.cr_name	= "AUTH_UNIX",
248228 	.crdestroy	= unx_destroy_cred,
249
-	.crbind		= rpcauth_generic_bind_cred,
250229 	.crmatch	= unx_match,
251230 	.crmarshal	= unx_marshal,
231
+	.crwrap_req	= rpcauth_wrap_req_encode,
252232 	.crrefresh	= unx_refresh,
253233 	.crvalidate	= unx_validate,
234
+	.crunwrap_resp	= rpcauth_unwrap_resp_decode,
254235 };