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