1 // SPDX-License-Identifier: GPL-2.0 1 // SPDX-License-Identifier: GPL-2.0
2 /* 2 /*
3 * linux/net/sunrpc/auth_unix.c 3 * linux/net/sunrpc/auth_unix.c
4 * 4 *
5 * UNIX-style authentication; no AUTH_SHORT su 5 * UNIX-style authentication; no AUTH_SHORT support
6 * 6 *
7 * Copyright (C) 1996, Olaf Kirch <okir@monad. 7 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
8 */ 8 */
9 9
10 #include <linux/slab.h> 10 #include <linux/slab.h>
11 #include <linux/types.h> 11 #include <linux/types.h>
12 #include <linux/sched.h> 12 #include <linux/sched.h>
13 #include <linux/module.h> 13 #include <linux/module.h>
14 #include <linux/mempool.h> <<
15 #include <linux/sunrpc/clnt.h> 14 #include <linux/sunrpc/clnt.h>
16 #include <linux/sunrpc/auth.h> 15 #include <linux/sunrpc/auth.h>
17 #include <linux/user_namespace.h> 16 #include <linux/user_namespace.h>
18 17
>> 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
19 24
20 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 25 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
21 # define RPCDBG_FACILITY RPCDBG_AUTH 26 # define RPCDBG_FACILITY RPCDBG_AUTH
22 #endif 27 #endif
23 28
24 static struct rpc_auth unix_auth; 29 static struct rpc_auth unix_auth;
25 static const struct rpc_credops unix_credops; 30 static const struct rpc_credops unix_credops;
26 static mempool_t *unix_pool; <<
27 31
28 static struct rpc_auth * 32 static struct rpc_auth *
29 unx_create(const struct rpc_auth_create_args * !! 33 unx_create(struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
30 { 34 {
31 refcount_inc(&unix_auth.au_count); !! 35 dprintk("RPC: creating UNIX authenticator for client %p\n",
>> 36 clnt);
>> 37 atomic_inc(&unix_auth.au_count);
32 return &unix_auth; 38 return &unix_auth;
33 } 39 }
34 40
35 static void 41 static void
36 unx_destroy(struct rpc_auth *auth) 42 unx_destroy(struct rpc_auth *auth)
37 { 43 {
>> 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);
38 } 54 }
39 55
40 /* 56 /*
41 * Lookup AUTH_UNIX creds for current process 57 * Lookup AUTH_UNIX creds for current process
42 */ 58 */
43 static struct rpc_cred *unx_lookup_cred(struct !! 59 static struct rpc_cred *
44 struct !! 60 unx_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
45 { 61 {
46 struct rpc_cred *ret; !! 62 return rpcauth_lookup_credcache(auth, acred, flags, GFP_NOFS);
>> 63 }
47 64
48 ret = kmalloc(sizeof(*ret), rpc_task_g !! 65 static struct rpc_cred *
49 if (!ret) { !! 66 unx_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags, gfp_t gfp)
50 if (!(flags & RPCAUTH_LOOKUP_A !! 67 {
51 return ERR_PTR(-ENOMEM !! 68 struct unx_cred *cred;
52 ret = mempool_alloc(unix_pool, !! 69 unsigned int groups = 0;
53 if (!ret) !! 70 unsigned int i;
54 return ERR_PTR(-ENOMEM !! 71
55 } !! 72 dprintk("RPC: allocating UNIX cred for uid %d gid %d\n",
56 rpcauth_init_cred(ret, acred, auth, &u !! 73 from_kuid(&init_user_ns, acred->uid),
57 ret->cr_flags = 1UL << RPCAUTH_CRED_UP !! 74 from_kgid(&init_user_ns, acred->gid));
58 return ret; !! 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;
59 } 94 }
60 95
61 static void 96 static void
62 unx_free_cred_callback(struct rcu_head *head) !! 97 unx_free_cred(struct unx_cred *unx_cred)
63 { 98 {
64 struct rpc_cred *rpc_cred = container_ !! 99 dprintk("RPC: unx_free_cred %p\n", unx_cred);
>> 100 kfree(unx_cred);
>> 101 }
65 102
66 put_cred(rpc_cred->cr_cred); !! 103 static void
67 mempool_free(rpc_cred, unix_pool); !! 104 unx_free_cred_callback(struct rcu_head *head)
>> 105 {
>> 106 struct unx_cred *unx_cred = container_of(head, struct unx_cred, uc_base.cr_rcu);
>> 107 unx_free_cred(unx_cred);
68 } 108 }
69 109
70 static void 110 static void
71 unx_destroy_cred(struct rpc_cred *cred) 111 unx_destroy_cred(struct rpc_cred *cred)
72 { 112 {
73 call_rcu(&cred->cr_rcu, unx_free_cred_ 113 call_rcu(&cred->cr_rcu, unx_free_cred_callback);
74 } 114 }
75 115
76 /* 116 /*
77 * Match credentials against current the auth_ !! 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).
78 */ 120 */
79 static int 121 static int
80 unx_match(struct auth_cred *acred, struct rpc_ !! 122 unx_match(struct auth_cred *acred, struct rpc_cred *rcred, int flags)
81 { 123 {
>> 124 struct unx_cred *cred = container_of(rcred, struct unx_cred, uc_base);
82 unsigned int groups = 0; 125 unsigned int groups = 0;
83 unsigned int i; 126 unsigned int i;
84 127
85 if (cred->cr_cred == acred->cred) <<
86 return 1; <<
87 128
88 if (!uid_eq(cred->cr_cred->fsuid, acre !! 129 if (!uid_eq(cred->uc_uid, acred->uid) || !gid_eq(cred->uc_gid, acred->gid))
89 return 0; 130 return 0;
90 131
91 if (acred->cred->group_info != NULL) !! 132 if (acred->group_info != NULL)
92 groups = acred->cred->group_in !! 133 groups = acred->group_info->ngroups;
93 if (groups > UNX_NGROUPS) 134 if (groups > UNX_NGROUPS)
94 groups = UNX_NGROUPS; 135 groups = UNX_NGROUPS;
95 if (cred->cr_cred->group_info == NULL) <<
96 return groups == 0; <<
97 if (groups != cred->cr_cred->group_inf <<
98 return 0; <<
99 <<
100 for (i = 0; i < groups ; i++) 136 for (i = 0; i < groups ; i++)
101 if (!gid_eq(cred->cr_cred->gro !! 137 if (!gid_eq(cred->uc_gids[i], acred->group_info->gid[i]))
102 return 0; 138 return 0;
>> 139 if (groups < UNX_NGROUPS && gid_valid(cred->uc_gids[groups]))
>> 140 return 0;
103 return 1; 141 return 1;
104 } 142 }
105 143
106 /* 144 /*
107 * Marshal credentials. 145 * Marshal credentials.
108 * Maybe we should keep a cached credential fo 146 * Maybe we should keep a cached credential for performance reasons.
109 */ 147 */
110 static int !! 148 static __be32 *
111 unx_marshal(struct rpc_task *task, struct xdr_ !! 149 unx_marshal(struct rpc_task *task, __be32 *p)
112 { 150 {
113 struct rpc_clnt *clnt = task->tk_clien 151 struct rpc_clnt *clnt = task->tk_client;
114 struct rpc_cred *cred = task->tk_rqstp !! 152 struct unx_cred *cred = container_of(task->tk_rqstp->rq_cred, struct unx_cred, uc_base);
115 __be32 *p, *cred_len, *gidarr !! 153 __be32 *base, *hold;
116 int i; 154 int i;
117 struct group_info *gi = cred->cr_cred- <<
118 struct user_namespace *userns = clnt-> <<
119 clnt->cl_cred->user_ns : &init <<
120 <<
121 /* Credential */ <<
122 <<
123 p = xdr_reserve_space(xdr, 3 * sizeof( <<
124 if (!p) <<
125 goto marshal_failed; <<
126 *p++ = rpc_auth_unix; <<
127 cred_len = p++; <<
128 *p++ = xdr_zero; /* stamp */ <<
129 if (xdr_stream_encode_opaque(xdr, clnt <<
130 clnt->cl_ <<
131 goto marshal_failed; <<
132 p = xdr_reserve_space(xdr, 3 * sizeof( <<
133 if (!p) <<
134 goto marshal_failed; <<
135 *p++ = cpu_to_be32(from_kuid_munged(us <<
136 *p++ = cpu_to_be32(from_kgid_munged(us <<
137 <<
138 gidarr_len = p++; <<
139 if (gi) <<
140 for (i = 0; i < UNX_NGROUPS && <<
141 *p++ = cpu_to_be32(fro <<
142 *gidarr_len = cpu_to_be32(p - gidarr_l <<
143 *cred_len = cpu_to_be32((p - cred_len <<
144 p = xdr_reserve_space(xdr, (p - gidarr <<
145 if (!p) <<
146 goto marshal_failed; <<
147 <<
148 /* Verifier */ <<
149 <<
150 p = xdr_reserve_space(xdr, 2 * sizeof( <<
151 if (!p) <<
152 goto marshal_failed; <<
153 *p++ = rpc_auth_null; <<
154 *p = xdr_zero; <<
155 155
156 return 0; !! 156 *p++ = htonl(RPC_AUTH_UNIX);
>> 157 base = p++;
>> 158 *p++ = htonl(jiffies/HZ);
>> 159
>> 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);
>> 164
>> 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 */
>> 172
>> 173 *p++ = htonl(RPC_AUTH_NULL);
>> 174 *p++ = htonl(0);
157 175
158 marshal_failed: !! 176 return p;
159 return -EMSGSIZE; <<
160 } 177 }
161 178
162 /* 179 /*
163 * Refresh credentials. This is a no-op for AU 180 * Refresh credentials. This is a no-op for AUTH_UNIX
164 */ 181 */
165 static int 182 static int
166 unx_refresh(struct rpc_task *task) 183 unx_refresh(struct rpc_task *task)
167 { 184 {
168 set_bit(RPCAUTH_CRED_UPTODATE, &task-> 185 set_bit(RPCAUTH_CRED_UPTODATE, &task->tk_rqstp->rq_cred->cr_flags);
169 return 0; 186 return 0;
170 } 187 }
171 188
172 static int !! 189 static __be32 *
173 unx_validate(struct rpc_task *task, struct xdr !! 190 unx_validate(struct rpc_task *task, __be32 *p)
174 { 191 {
175 struct rpc_auth *auth = task->tk_rqstp !! 192 rpc_authflavor_t flavor;
176 __be32 *p; !! 193 u32 size;
177 u32 size; !! 194
178 !! 195 flavor = ntohl(*p++);
179 p = xdr_inline_decode(xdr, 2 * sizeof( !! 196 if (flavor != RPC_AUTH_NULL &&
180 if (!p) !! 197 flavor != RPC_AUTH_UNIX &&
181 return -EIO; !! 198 flavor != RPC_AUTH_SHORT) {
182 switch (*p++) { !! 199 printk("RPC: bad verf flavor: %u\n", flavor);
183 case rpc_auth_null: !! 200 return ERR_PTR(-EIO);
184 case rpc_auth_unix: <<
185 case rpc_auth_short: <<
186 break; <<
187 default: <<
188 return -EIO; <<
189 } 201 }
190 size = be32_to_cpup(p); !! 202
191 if (size > RPC_MAX_AUTH_SIZE) !! 203 size = ntohl(*p++);
192 return -EIO; !! 204 if (size > RPC_MAX_AUTH_SIZE) {
193 p = xdr_inline_decode(xdr, size); !! 205 printk("RPC: giant verf size: %u\n", size);
194 if (!p) !! 206 return ERR_PTR(-EIO);
195 return -EIO; !! 207 }
196 !! 208 task->tk_rqstp->rq_cred->cr_auth->au_rslack = (size >> 2) + 2;
197 auth->au_verfsize = XDR_QUADLEN(size) !! 209 p += (size >> 2);
198 auth->au_rslack = XDR_QUADLEN(size) + !! 210
199 auth->au_ralign = XDR_QUADLEN(size) + !! 211 return p;
200 return 0; <<
201 } 212 }
202 213
203 int __init rpc_init_authunix(void) 214 int __init rpc_init_authunix(void)
204 { 215 {
205 unix_pool = mempool_create_kmalloc_poo !! 216 return rpcauth_init_credcache(&unix_auth);
206 return unix_pool ? 0 : -ENOMEM; <<
207 } 217 }
208 218
209 void rpc_destroy_authunix(void) 219 void rpc_destroy_authunix(void)
210 { 220 {
211 mempool_destroy(unix_pool); !! 221 rpcauth_destroy_credcache(&unix_auth);
212 } 222 }
213 223
214 const struct rpc_authops authunix_ops = { 224 const struct rpc_authops authunix_ops = {
215 .owner = THIS_MODULE, 225 .owner = THIS_MODULE,
216 .au_flavor = RPC_AUTH_UNIX, 226 .au_flavor = RPC_AUTH_UNIX,
217 .au_name = "UNIX", 227 .au_name = "UNIX",
218 .create = unx_create, 228 .create = unx_create,
219 .destroy = unx_destroy, 229 .destroy = unx_destroy,
>> 230 .hash_cred = unx_hash_cred,
220 .lookup_cred = unx_lookup_cred, 231 .lookup_cred = unx_lookup_cred,
>> 232 .crcreate = unx_create_cred,
221 }; 233 };
222 234
223 static 235 static
224 struct rpc_auth unix_auth = { 236 struct rpc_auth unix_auth = {
225 .au_cslack = UNX_CALLSLACK, 237 .au_cslack = UNX_CALLSLACK,
226 .au_rslack = NUL_REPLYSLACK, 238 .au_rslack = NUL_REPLYSLACK,
227 .au_verfsize = NUL_REPLYSLACK, !! 239 .au_flags = RPCAUTH_AUTH_NO_CRKEY_TIMEOUT,
228 .au_ops = &authunix_ops, 240 .au_ops = &authunix_ops,
229 .au_flavor = RPC_AUTH_UNIX, 241 .au_flavor = RPC_AUTH_UNIX,
230 .au_count = REFCOUNT_INIT(1), !! 242 .au_count = ATOMIC_INIT(0),
231 }; 243 };
232 244
233 static 245 static
234 const struct rpc_credops unix_credops = { 246 const struct rpc_credops unix_credops = {
235 .cr_name = "AUTH_UNIX", 247 .cr_name = "AUTH_UNIX",
236 .crdestroy = unx_destroy_cred, 248 .crdestroy = unx_destroy_cred,
>> 249 .crbind = rpcauth_generic_bind_cred,
237 .crmatch = unx_match, 250 .crmatch = unx_match,
238 .crmarshal = unx_marshal, 251 .crmarshal = unx_marshal,
239 .crwrap_req = rpcauth_wrap_req_enc <<
240 .crrefresh = unx_refresh, 252 .crrefresh = unx_refresh,
241 .crvalidate = unx_validate, 253 .crvalidate = unx_validate,
242 .crunwrap_resp = rpcauth_unwrap_resp_ <<
243 }; 254 };
244 255
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