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186 lines
6.2 KiB
186 lines
6.2 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* linux/include/linux/sunrpc/svcauth.h |
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* |
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* RPC server-side authentication stuff. |
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* |
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* Copyright (C) 1995, 1996 Olaf Kirch <[email protected]> |
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*/ |
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#ifndef _LINUX_SUNRPC_SVCAUTH_H_ |
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#define _LINUX_SUNRPC_SVCAUTH_H_ |
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#include <linux/string.h> |
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#include <linux/sunrpc/msg_prot.h> |
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#include <linux/sunrpc/cache.h> |
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#include <linux/sunrpc/gss_api.h> |
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#include <linux/hash.h> |
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#include <linux/stringhash.h> |
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#include <linux/cred.h> |
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struct svc_cred { |
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kuid_t cr_uid; |
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kgid_t cr_gid; |
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struct group_info *cr_group_info; |
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u32 cr_flavor; /* pseudoflavor */ |
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/* name of form servicetype/hostname@REALM, passed down by |
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* gss-proxy: */ |
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char *cr_raw_principal; |
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/* name of form servicetype@hostname, passed down by |
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* rpc.svcgssd, or computed from the above: */ |
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char *cr_principal; |
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char *cr_targ_princ; |
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struct gss_api_mech *cr_gss_mech; |
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}; |
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static inline void init_svc_cred(struct svc_cred *cred) |
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{ |
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cred->cr_group_info = NULL; |
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cred->cr_raw_principal = NULL; |
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cred->cr_principal = NULL; |
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cred->cr_targ_princ = NULL; |
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cred->cr_gss_mech = NULL; |
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} |
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static inline void free_svc_cred(struct svc_cred *cred) |
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{ |
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if (cred->cr_group_info) |
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put_group_info(cred->cr_group_info); |
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kfree(cred->cr_raw_principal); |
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kfree(cred->cr_principal); |
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kfree(cred->cr_targ_princ); |
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gss_mech_put(cred->cr_gss_mech); |
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init_svc_cred(cred); |
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} |
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struct svc_rqst; /* forward decl */ |
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struct in6_addr; |
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/* Authentication is done in the context of a domain. |
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* |
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* Currently, the nfs server uses the auth_domain to stand |
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* for the "client" listed in /etc/exports. |
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* |
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* More generally, a domain might represent a group of clients using |
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* a common mechanism for authentication and having a common mapping |
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* between local identity (uid) and network identity. All clients |
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* in a domain have similar general access rights. Each domain can |
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* contain multiple principals which will have different specific right |
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* based on normal Discretionary Access Control. |
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* |
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* A domain is created by an authentication flavour module based on name |
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* only. Userspace then fills in detail on demand. |
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* |
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* In the case of auth_unix and auth_null, the auth_domain is also |
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* associated with entries in another cache representing the mapping |
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* of ip addresses to the given client. |
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*/ |
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struct auth_domain { |
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struct kref ref; |
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struct hlist_node hash; |
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char *name; |
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struct auth_ops *flavour; |
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struct rcu_head rcu_head; |
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}; |
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/* |
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* Each authentication flavour registers an auth_ops |
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* structure. |
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* name is simply the name. |
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* flavour gives the auth flavour. It determines where the flavour is registered |
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* accept() is given a request and should verify it. |
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* It should inspect the authenticator and verifier, and possibly the data. |
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* If there is a problem with the authentication *authp should be set. |
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* The return value of accept() can indicate: |
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* OK - authorised. client and credential are set in rqstp. |
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* reqbuf points to arguments |
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* resbuf points to good place for results. verfier |
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* is (probably) already in place. Certainly space is |
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* reserved for it. |
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* DROP - simply drop the request. It may have been deferred |
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* GARBAGE - rpc garbage_args error |
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* SYSERR - rpc system_err error |
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* DENIED - authp holds reason for denial. |
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* COMPLETE - the reply is encoded already and ready to be sent; no |
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* further processing is necessary. (This is used for processing |
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* null procedure calls which are used to set up encryption |
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* contexts.) |
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* |
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* accept is passed the proc number so that it can accept NULL rpc requests |
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* even if it cannot authenticate the client (as is sometimes appropriate). |
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* |
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* release() is given a request after the procedure has been run. |
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* It should sign/encrypt the results if needed |
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* It should return: |
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* OK - the resbuf is ready to be sent |
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* DROP - the reply should be quitely dropped |
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* DENIED - authp holds a reason for MSG_DENIED |
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* SYSERR - rpc system_err |
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* |
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* domain_release() |
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* This call releases a domain. |
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* set_client() |
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* Givens a pending request (struct svc_rqst), finds and assigns |
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* an appropriate 'auth_domain' as the client. |
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*/ |
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struct auth_ops { |
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char * name; |
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struct module *owner; |
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int flavour; |
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int (*accept)(struct svc_rqst *rq, __be32 *authp); |
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int (*release)(struct svc_rqst *rq); |
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void (*domain_release)(struct auth_domain *); |
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int (*set_client)(struct svc_rqst *rq); |
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}; |
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#define SVC_GARBAGE 1 |
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#define SVC_SYSERR 2 |
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#define SVC_VALID 3 |
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#define SVC_NEGATIVE 4 |
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#define SVC_OK 5 |
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#define SVC_DROP 6 |
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#define SVC_CLOSE 7 /* Like SVC_DROP, but request is definitely |
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* lost so if there is a tcp connection, it |
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* should be closed |
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*/ |
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#define SVC_DENIED 8 |
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#define SVC_PENDING 9 |
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#define SVC_COMPLETE 10 |
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struct svc_xprt; |
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extern int svc_authenticate(struct svc_rqst *rqstp, __be32 *authp); |
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extern int svc_authorise(struct svc_rqst *rqstp); |
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extern int svc_set_client(struct svc_rqst *rqstp); |
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extern int svc_auth_register(rpc_authflavor_t flavor, struct auth_ops *aops); |
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extern void svc_auth_unregister(rpc_authflavor_t flavor); |
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extern struct auth_domain *unix_domain_find(char *name); |
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extern void auth_domain_put(struct auth_domain *item); |
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extern int auth_unix_add_addr(struct net *net, struct in6_addr *addr, struct auth_domain *dom); |
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extern struct auth_domain *auth_domain_lookup(char *name, struct auth_domain *new); |
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extern struct auth_domain *auth_domain_find(char *name); |
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extern struct auth_domain *auth_unix_lookup(struct net *net, struct in6_addr *addr); |
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extern int auth_unix_forget_old(struct auth_domain *dom); |
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extern void svcauth_unix_purge(struct net *net); |
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extern void svcauth_unix_info_release(struct svc_xprt *xpt); |
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extern int svcauth_unix_set_client(struct svc_rqst *rqstp); |
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extern int unix_gid_cache_create(struct net *net); |
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extern void unix_gid_cache_destroy(struct net *net); |
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/* |
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* The <stringhash.h> functions are good enough that we don't need to |
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* use hash_32() on them; just extracting the high bits is enough. |
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*/ |
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static inline unsigned long hash_str(char const *name, int bits) |
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{ |
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return hashlen_hash(hashlen_string(NULL, name)) >> (32 - bits); |
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} |
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static inline unsigned long hash_mem(char const *buf, int length, int bits) |
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{ |
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return full_name_hash(NULL, buf, length) >> (32 - bits); |
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} |
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#endif /* _LINUX_SUNRPC_SVCAUTH_H_ */
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