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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 <okir@monad.swb.de>
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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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#ifdef __KERNEL__
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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/hash.h>
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struct svc_cred {
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        uid_t                   cr_uid;
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        gid_t                   cr_gid;
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        gid_t                   cr_groups[NGROUPS];
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};
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struct svc_rqst;                /* forward decl */
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/* Authentication is done in the context of a domain.
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 * For a server, a domain represents 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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 * For a client, a domain represents a number of servers which all
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 * use a common authentication mechanism and network identity name space.
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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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 * The creation of a domain typically implies creation of one or
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 * more caches for storing domain specific information.
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 */
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struct auth_domain {
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        struct  cache_head      h;
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        char                    *name;
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        int                     flavour;
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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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 *
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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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 */
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struct auth_ops {
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        char *  name;
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        int     flavour;
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        int     (*accept)(struct svc_rqst *rq, u32 *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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};
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extern struct auth_ops  *authtab[RPC_AUTH_MAXFLAVOR];
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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_DENIED      7
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#define SVC_PENDING     8
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extern int      svc_authenticate(struct svc_rqst *rqstp, u32 *authp);
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extern int      svc_authorise(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 in_addr addr, struct auth_domain *dom);
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extern struct auth_domain *auth_domain_lookup(struct auth_domain *item, int set);
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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 in_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(void);
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static inline unsigned long hash_str(char *name, int bits)
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{
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        unsigned long hash = 0;
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        unsigned long l = 0;
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        int len = 0;
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        unsigned char c;
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        do {
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                if (unlikely(!(c = *name++))) {
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                        c = (char)len; len = -1;
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                }
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                l = (l << 8) | c;
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                len++;
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                if ((len & (BITS_PER_LONG/8-1))==0)
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                        hash = hash_long(hash^l, BITS_PER_LONG);
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        } while (len);
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        return hash >> (BITS_PER_LONG - bits);
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}
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static inline unsigned long hash_mem(char *buf, int length, int bits)
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{
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        unsigned long hash = 0;
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        unsigned long l = 0;
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        int len = 0;
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        unsigned char c;
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        do {
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                if (len == length) {
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                        c = (char)len; len = -1;
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                } else
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                        c = *buf++;
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                l = (l << 8) | c;
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                len++;
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                if ((len & (BITS_PER_LONG/8-1))==0)
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                        hash = hash_long(hash^l, BITS_PER_LONG);
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        } while (len);
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        return hash >> (BITS_PER_LONG - bits);
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}
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extern struct cache_detail auth_domain_cache, ip_map_cache;
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#endif /* __KERNEL__ */
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#endif /* _LINUX_SUNRPC_SVCAUTH_H_ */