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/utsname.h> 12 #include <linux/sunrpc/clnt.h> 13 #include <linux/sched.h> 14 15 #ifdef RPC_DEBUG 16 # define RPCDBG_FACILITY RPCDBG_AUTH 17 #endif 18 19 static struct rpc_auth null_auth; 20 static struct rpc_cred null_cred; 21 22 static struct rpc_auth * 23 nul_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor) 24 { 25 atomic_inc(&null_auth.au_count); 26 return &null_auth; 27 } 28 29 static void 30 nul_destroy(struct rpc_auth *auth) 31 { 32 } 33 34 /* 35 * Lookup NULL creds for current process 36 */ 37 static struct rpc_cred * 38 nul_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 39 { 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 u32 * 64 nul_marshal(struct rpc_task *task, u32 *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 task->tk_msg.rpc_cred->cr_flags |= RPCAUTH_CRED_UPTODATE; 81 return 0; 82 } 83 84 static u32 * 85 nul_validate(struct rpc_task *task, u32 *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 NULL; 94 } 95 96 size = ntohl(*p++); 97 if (size != 0) { 98 printk("RPC: bad verf size: %u\n", size); 99 return NULL; 100 } 101 102 return p; 103 } 104 105 struct rpc_authops authnull_ops = { 106 .owner = THIS_MODULE, 107 .au_flavor = RPC_AUTH_NULL, 108 #ifdef RPC_DEBUG 109 .au_name = "NULL", 110 #endif 111 .create = nul_create, 112 .destroy = nul_destroy, 113 .lookup_cred = nul_lookup_cred, 114 }; 115 116 static 117 struct rpc_auth null_auth = { 118 .au_cslack = 4, 119 .au_rslack = 2, 120 .au_ops = &authnull_ops, 121 }; 122 123 static 124 struct rpc_credops null_credops = { 125 .cr_name = "AUTH_NULL", 126 .crdestroy = nul_destroy_cred, 127 .crmatch = nul_match, 128 .crmarshal = nul_marshal, 129 .crrefresh = nul_refresh, 130 .crvalidate = nul_validate, 131 }; 132 133 static 134 struct rpc_cred null_cred = { 135 .cr_ops = &null_credops, 136 .cr_count = ATOMIC_INIT(1), 137 .cr_flags = RPCAUTH_CRED_UPTODATE, 138 #ifdef RPC_DEBUG 139 .cr_magic = RPCAUTH_CRED_MAGIC, 140 #endif 141 }; 142