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