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/socket.h> 11 #include <linux/module.h> 12 #include <linux/in.h> 13 #include <linux/utsname.h> 14 #include <linux/sunrpc/clnt.h> 15 #include <linux/sched.h> 16 17 #ifdef RPC_DEBUG 18 # define RPCDBG_FACILITY RPCDBG_AUTH 19 #endif 20 21 static struct rpc_auth null_auth; 22 static struct rpc_cred null_cred; 23 24 static struct rpc_auth * 25 nul_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor) 26 { 27 atomic_inc(&null_auth.au_count); 28 return &null_auth; 29 } 30 31 static void 32 nul_destroy(struct rpc_auth *auth) 33 { 34 } 35 36 /* 37 * Lookup NULL creds for current process 38 */ 39 static struct rpc_cred * 40 nul_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 41 { 42 return get_rpccred(&null_cred); 43 } 44 45 /* 46 * Destroy cred handle. 47 */ 48 static void 49 nul_destroy_cred(struct rpc_cred *cred) 50 { 51 } 52 53 /* 54 * Match cred handle against current process 55 */ 56 static int 57 nul_match(struct auth_cred *acred, struct rpc_cred *cred, int taskflags) 58 { 59 return 1; 60 } 61 62 /* 63 * Marshal credential. 64 */ 65 static u32 * 66 nul_marshal(struct rpc_task *task, u32 *p) 67 { 68 *p++ = htonl(RPC_AUTH_NULL); 69 *p++ = 0; 70 *p++ = htonl(RPC_AUTH_NULL); 71 *p++ = 0; 72 73 return p; 74 } 75 76 /* 77 * Refresh credential. This is a no-op for AUTH_NULL 78 */ 79 static int 80 nul_refresh(struct rpc_task *task) 81 { 82 task->tk_msg.rpc_cred->cr_flags |= RPCAUTH_CRED_UPTODATE; 83 return 0; 84 } 85 86 static u32 * 87 nul_validate(struct rpc_task *task, u32 *p) 88 { 89 rpc_authflavor_t flavor; 90 u32 size; 91 92 flavor = ntohl(*p++); 93 if (flavor != RPC_AUTH_NULL) { 94 printk("RPC: bad verf flavor: %u\n", flavor); 95 return NULL; 96 } 97 98 size = ntohl(*p++); 99 if (size != 0) { 100 printk("RPC: bad verf size: %u\n", size); 101 return NULL; 102 } 103 104 return p; 105 } 106 107 struct rpc_authops authnull_ops = { 108 .owner = THIS_MODULE, 109 .au_flavor = RPC_AUTH_NULL, 110 #ifdef RPC_DEBUG 111 .au_name = "NULL", 112 #endif 113 .create = nul_create, 114 .destroy = nul_destroy, 115 .lookup_cred = nul_lookup_cred, 116 }; 117 118 static 119 struct rpc_auth null_auth = { 120 .au_cslack = 4, 121 .au_rslack = 2, 122 .au_ops = &authnull_ops, 123 }; 124 125 static 126 struct rpc_credops null_credops = { 127 .cr_name = "AUTH_NULL", 128 .crdestroy = nul_destroy_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_ops = &null_credops, 138 .cr_count = ATOMIC_INIT(1), 139 .cr_flags = RPCAUTH_CRED_UPTODATE, 140 #ifdef RPC_DEBUG 141 .cr_magic = RPCAUTH_CRED_MAGIC, 142 #endif 143 }; 144