1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/net/sunrpc/auth_null.c 4 * 5 * AUTH_NULL authentication. Really :-) 6 * 7 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de> 8 */ 9 10 #include <linux/types.h> 11 #include <linux/module.h> 12 #include <linux/sunrpc/clnt.h> 13 14 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 15 # define RPCDBG_FACILITY RPCDBG_AUTH 16 #endif 17 18 static struct rpc_auth null_auth; 19 static struct rpc_cred null_cred; 20 21 static struct rpc_auth * 22 nul_create(const struct rpc_auth_create_args *args, struct rpc_clnt *clnt) 23 { 24 atomic_inc(&null_auth.au_count); 25 return &null_auth; 26 } 27 28 static void 29 nul_destroy(struct rpc_auth *auth) 30 { 31 } 32 33 /* 34 * Lookup NULL creds for current process 35 */ 36 static struct rpc_cred * 37 nul_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 38 { 39 if (flags & RPCAUTH_LOOKUP_RCU) 40 return &null_cred; 41 return get_rpccred(&null_cred); 42 } 43 44 /* 45 * Destroy cred handle. 46 */ 47 static void 48 nul_destroy_cred(struct rpc_cred *cred) 49 { 50 } 51 52 /* 53 * Match cred handle against current process 54 */ 55 static int 56 nul_match(struct auth_cred *acred, struct rpc_cred *cred, int taskflags) 57 { 58 return 1; 59 } 60 61 /* 62 * Marshal credential. 63 */ 64 static __be32 * 65 nul_marshal(struct rpc_task *task, __be32 *p) 66 { 67 *p++ = htonl(RPC_AUTH_NULL); 68 *p++ = 0; 69 *p++ = htonl(RPC_AUTH_NULL); 70 *p++ = 0; 71 72 return p; 73 } 74 75 /* 76 * Refresh credential. This is a no-op for AUTH_NULL 77 */ 78 static int 79 nul_refresh(struct rpc_task *task) 80 { 81 set_bit(RPCAUTH_CRED_UPTODATE, &task->tk_rqstp->rq_cred->cr_flags); 82 return 0; 83 } 84 85 static __be32 * 86 nul_validate(struct rpc_task *task, __be32 *p) 87 { 88 rpc_authflavor_t flavor; 89 u32 size; 90 91 flavor = ntohl(*p++); 92 if (flavor != RPC_AUTH_NULL) { 93 printk("RPC: bad verf flavor: %u\n", flavor); 94 return ERR_PTR(-EIO); 95 } 96 97 size = ntohl(*p++); 98 if (size != 0) { 99 printk("RPC: bad verf size: %u\n", size); 100 return ERR_PTR(-EIO); 101 } 102 103 return p; 104 } 105 106 const struct rpc_authops authnull_ops = { 107 .owner = THIS_MODULE, 108 .au_flavor = RPC_AUTH_NULL, 109 .au_name = "NULL", 110 .create = nul_create, 111 .destroy = nul_destroy, 112 .lookup_cred = nul_lookup_cred, 113 }; 114 115 static 116 struct rpc_auth null_auth = { 117 .au_cslack = NUL_CALLSLACK, 118 .au_rslack = NUL_REPLYSLACK, 119 .au_flags = RPCAUTH_AUTH_NO_CRKEY_TIMEOUT, 120 .au_ops = &authnull_ops, 121 .au_flavor = RPC_AUTH_NULL, 122 .au_count = ATOMIC_INIT(0), 123 }; 124 125 static 126 const struct rpc_credops null_credops = { 127 .cr_name = "AUTH_NULL", 128 .crdestroy = nul_destroy_cred, 129 .crbind = rpcauth_generic_bind_cred, 130 .crmatch = nul_match, 131 .crmarshal = nul_marshal, 132 .crrefresh = nul_refresh, 133 .crvalidate = nul_validate, 134 }; 135 136 static 137 struct rpc_cred null_cred = { 138 .cr_lru = LIST_HEAD_INIT(null_cred.cr_lru), 139 .cr_auth = &null_auth, 140 .cr_ops = &null_credops, 141 .cr_count = REFCOUNT_INIT(2), 142 .cr_flags = 1UL << RPCAUTH_CRED_UPTODATE, 143 }; 144