1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * linux/include/linux/sunrpc/svcauth.h 4 * 5 * RPC server-side authentication stuff. 6 * 7 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> 8 */ 9 10 #ifndef _LINUX_SUNRPC_SVCAUTH_H_ 11 #define _LINUX_SUNRPC_SVCAUTH_H_ 12 13 #include <linux/string.h> 14 #include <linux/sunrpc/msg_prot.h> 15 #include <linux/sunrpc/cache.h> 16 #include <linux/sunrpc/gss_api.h> 17 #include <linux/hash.h> 18 #include <linux/stringhash.h> 19 #include <linux/cred.h> 20 21 struct svc_cred { 22 kuid_t cr_uid; 23 kgid_t cr_gid; 24 struct group_info *cr_group_info; 25 u32 cr_flavor; /* pseudoflavor */ 26 /* name of form servicetype/hostname@REALM, passed down by 27 * gss-proxy: */ 28 char *cr_raw_principal; 29 /* name of form servicetype@hostname, passed down by 30 * rpc.svcgssd, or computed from the above: */ 31 char *cr_principal; 32 char *cr_targ_princ; 33 struct gss_api_mech *cr_gss_mech; 34 }; 35 36 static inline void init_svc_cred(struct svc_cred *cred) 37 { 38 cred->cr_group_info = NULL; 39 cred->cr_raw_principal = NULL; 40 cred->cr_principal = NULL; 41 cred->cr_targ_princ = NULL; 42 cred->cr_gss_mech = NULL; 43 } 44 45 static inline void free_svc_cred(struct svc_cred *cred) 46 { 47 if (cred->cr_group_info) 48 put_group_info(cred->cr_group_info); 49 kfree(cred->cr_raw_principal); 50 kfree(cred->cr_principal); 51 kfree(cred->cr_targ_princ); 52 gss_mech_put(cred->cr_gss_mech); 53 init_svc_cred(cred); 54 } 55 56 struct svc_rqst; /* forward decl */ 57 struct in6_addr; 58 59 /* Authentication is done in the context of a domain. 60 * 61 * Currently, the nfs server uses the auth_domain to stand 62 * for the "client" listed in /etc/exports. 63 * 64 * More generally, a domain might represent a group of clients using 65 * a common mechanism for authentication and having a common mapping 66 * between local identity (uid) and network identity. All clients 67 * in a domain have similar general access rights. Each domain can 68 * contain multiple principals which will have different specific right 69 * based on normal Discretionary Access Control. 70 * 71 * A domain is created by an authentication flavour module based on name 72 * only. Userspace then fills in detail on demand. 73 * 74 * In the case of auth_unix and auth_null, the auth_domain is also 75 * associated with entries in another cache representing the mapping 76 * of ip addresses to the given client. 77 */ 78 struct auth_domain { 79 struct kref ref; 80 struct hlist_node hash; 81 char *name; 82 struct auth_ops *flavour; 83 struct rcu_head rcu_head; 84 }; 85 86 /* 87 * Each authentication flavour registers an auth_ops 88 * structure. 89 * name is simply the name. 90 * flavour gives the auth flavour. It determines where the flavour is registered 91 * accept() is given a request and should verify it. 92 * It should inspect the authenticator and verifier, and possibly the data. 93 * If there is a problem with the authentication *authp should be set. 94 * The return value of accept() can indicate: 95 * OK - authorised. client and credential are set in rqstp. 96 * reqbuf points to arguments 97 * resbuf points to good place for results. verfier 98 * is (probably) already in place. Certainly space is 99 * reserved for it. 100 * DROP - simply drop the request. It may have been deferred 101 * GARBAGE - rpc garbage_args error 102 * SYSERR - rpc system_err error 103 * DENIED - authp holds reason for denial. 104 * COMPLETE - the reply is encoded already and ready to be sent; no 105 * further processing is necessary. (This is used for processing 106 * null procedure calls which are used to set up encryption 107 * contexts.) 108 * 109 * accept is passed the proc number so that it can accept NULL rpc requests 110 * even if it cannot authenticate the client (as is sometimes appropriate). 111 * 112 * release() is given a request after the procedure has been run. 113 * It should sign/encrypt the results if needed 114 * It should return: 115 * OK - the resbuf is ready to be sent 116 * DROP - the reply should be quitely dropped 117 * DENIED - authp holds a reason for MSG_DENIED 118 * SYSERR - rpc system_err 119 * 120 * domain_release() 121 * This call releases a domain. 122 * set_client() 123 * Givens a pending request (struct svc_rqst), finds and assigns 124 * an appropriate 'auth_domain' as the client. 125 */ 126 struct auth_ops { 127 char * name; 128 struct module *owner; 129 int flavour; 130 int (*accept)(struct svc_rqst *rq, __be32 *authp); 131 int (*release)(struct svc_rqst *rq); 132 void (*domain_release)(struct auth_domain *); 133 int (*set_client)(struct svc_rqst *rq); 134 }; 135 136 #define SVC_GARBAGE 1 137 #define SVC_SYSERR 2 138 #define SVC_VALID 3 139 #define SVC_NEGATIVE 4 140 #define SVC_OK 5 141 #define SVC_DROP 6 142 #define SVC_CLOSE 7 /* Like SVC_DROP, but request is definitely 143 * lost so if there is a tcp connection, it 144 * should be closed 145 */ 146 #define SVC_DENIED 8 147 #define SVC_PENDING 9 148 #define SVC_COMPLETE 10 149 150 struct svc_xprt; 151 152 extern int svc_authenticate(struct svc_rqst *rqstp, __be32 *authp); 153 extern int svc_authorise(struct svc_rqst *rqstp); 154 extern int svc_set_client(struct svc_rqst *rqstp); 155 extern int svc_auth_register(rpc_authflavor_t flavor, struct auth_ops *aops); 156 extern void svc_auth_unregister(rpc_authflavor_t flavor); 157 158 extern struct auth_domain *unix_domain_find(char *name); 159 extern void auth_domain_put(struct auth_domain *item); 160 extern int auth_unix_add_addr(struct net *net, struct in6_addr *addr, struct auth_domain *dom); 161 extern struct auth_domain *auth_domain_lookup(char *name, struct auth_domain *new); 162 extern struct auth_domain *auth_domain_find(char *name); 163 extern struct auth_domain *auth_unix_lookup(struct net *net, struct in6_addr *addr); 164 extern int auth_unix_forget_old(struct auth_domain *dom); 165 extern void svcauth_unix_purge(struct net *net); 166 extern void svcauth_unix_info_release(struct svc_xprt *xpt); 167 extern int svcauth_unix_set_client(struct svc_rqst *rqstp); 168 169 extern int unix_gid_cache_create(struct net *net); 170 extern void unix_gid_cache_destroy(struct net *net); 171 172 /* 173 * The <stringhash.h> functions are good enough that we don't need to 174 * use hash_32() on them; just extracting the high bits is enough. 175 */ 176 static inline unsigned long hash_str(char const *name, int bits) 177 { 178 return hashlen_hash(hashlen_string(NULL, name)) >> (32 - bits); 179 } 180 181 static inline unsigned long hash_mem(char const *buf, int length, int bits) 182 { 183 return full_name_hash(NULL, buf, length) >> (32 - bits); 184 } 185 186 #endif /* _LINUX_SUNRPC_SVCAUTH_H_ */ 187