diff options
Diffstat (limited to 'include/linux/sunrpc/svcauth.h')
| -rw-r--r-- | include/linux/sunrpc/svcauth.h | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/include/linux/sunrpc/svcauth.h b/include/linux/sunrpc/svcauth.h new file mode 100644 index 000000000000..c119ce7cbd22 --- /dev/null +++ b/include/linux/sunrpc/svcauth.h @@ -0,0 +1,167 @@ +/* + * linux/include/linux/sunrpc/svcauth.h + * + * RPC server-side authentication stuff. + * + * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> + */ + +#ifndef _LINUX_SUNRPC_SVCAUTH_H_ +#define _LINUX_SUNRPC_SVCAUTH_H_ + +#ifdef __KERNEL__ + +#include <linux/string.h> +#include <linux/sunrpc/msg_prot.h> +#include <linux/sunrpc/cache.h> +#include <linux/hash.h> + +#define SVC_CRED_NGROUPS 32 +struct svc_cred { + uid_t cr_uid; + gid_t cr_gid; + struct group_info *cr_group_info; +}; + +struct svc_rqst; /* forward decl */ + +/* Authentication is done in the context of a domain. + * + * Currently, the nfs server uses the auth_domain to stand + * for the "client" listed in /etc/exports. + * + * More generally, a domain might represent a group of clients using + * a common mechanism for authentication and having a common mapping + * between local identity (uid) and network identity. All clients + * in a domain have similar general access rights. Each domain can + * contain multiple principals which will have different specific right + * based on normal Discretionary Access Control. + * + * A domain is created by an authentication flavour module based on name + * only. Userspace then fills in detail on demand. + * + * In the case of auth_unix and auth_null, the auth_domain is also + * associated with entries in another cache representing the mapping + * of ip addresses to the given client. + */ +struct auth_domain { + struct cache_head h; + char *name; + int flavour; +}; + +/* + * Each authentication flavour registers an auth_ops + * structure. + * name is simply the name. + * flavour gives the auth flavour. It determines where the flavour is registered + * accept() is given a request and should verify it. + * It should inspect the authenticator and verifier, and possibly the data. + * If there is a problem with the authentication *authp should be set. + * The return value of accept() can indicate: + * OK - authorised. client and credential are set in rqstp. + * reqbuf points to arguments + * resbuf points to good place for results. verfier + * is (probably) already in place. Certainly space is + * reserved for it. + * DROP - simply drop the request. It may have been deferred + * GARBAGE - rpc garbage_args error + * SYSERR - rpc system_err error + * DENIED - authp holds reason for denial. + * COMPLETE - the reply is encoded already and ready to be sent; no + * further processing is necessary. (This is used for processing + * null procedure calls which are used to set up encryption + * contexts.) + * + * accept is passed the proc number so that it can accept NULL rpc requests + * even if it cannot authenticate the client (as is sometimes appropriate). + * + * release() is given a request after the procedure has been run. + * It should sign/encrypt the results if needed + * It should return: + * OK - the resbuf is ready to be sent + * DROP - the reply should be quitely dropped + * DENIED - authp holds a reason for MSG_DENIED + * SYSERR - rpc system_err + * + * domain_release() + * This call releases a domain. + */ +struct auth_ops { + char * name; + struct module *owner; + int flavour; + int (*accept)(struct svc_rqst *rq, u32 *authp); + int (*release)(struct svc_rqst *rq); + void (*domain_release)(struct auth_domain *); + int (*set_client)(struct svc_rqst *rq); +}; + +#define SVC_GARBAGE 1 +#define SVC_SYSERR 2 +#define SVC_VALID 3 +#define SVC_NEGATIVE 4 +#define SVC_OK 5 +#define SVC_DROP 6 +#define SVC_DENIED 7 +#define SVC_PENDING 8 +#define SVC_COMPLETE 9 + + +extern int svc_authenticate(struct svc_rqst *rqstp, u32 *authp); +extern int svc_authorise(struct svc_rqst *rqstp); +extern int svc_set_client(struct svc_rqst *rqstp); +extern int svc_auth_register(rpc_authflavor_t flavor, struct auth_ops *aops); +extern void svc_auth_unregister(rpc_authflavor_t flavor); + +extern struct auth_domain *unix_domain_find(char *name); +extern void auth_domain_put(struct auth_domain *item); +extern int auth_unix_add_addr(struct in_addr addr, struct auth_domain *dom); +extern struct auth_domain *auth_domain_lookup(struct auth_domain *item, int set); +extern struct auth_domain *auth_domain_find(char *name); +extern struct auth_domain *auth_unix_lookup(struct in_addr addr); +extern int auth_unix_forget_old(struct auth_domain *dom); +extern void svcauth_unix_purge(void); + +static inline unsigned long hash_str(char *name, int bits) +{ + unsigned long hash = 0; + unsigned long l = 0; + int len = 0; + unsigned char c; + do { + if (unlikely(!(c = *name++))) { + c = (char)len; len = -1; + } + l = (l << 8) | c; + len++; + if ((len & (BITS_PER_LONG/8-1))==0) + hash = hash_long(hash^l, BITS_PER_LONG); + } while (len); + return hash >> (BITS_PER_LONG - bits); +} + +static inline unsigned long hash_mem(char *buf, int length, int bits) +{ + unsigned long hash = 0; + unsigned long l = 0; + int len = 0; + unsigned char c; + do { + if (len == length) { + c = (char)len; len = -1; + } else + c = *buf++; + l = (l << 8) | c; + len++; + if ((len & (BITS_PER_LONG/8-1))==0) + hash = hash_long(hash^l, BITS_PER_LONG); + } while (len); + return hash >> (BITS_PER_LONG - bits); +} + +extern struct cache_detail auth_domain_cache, ip_map_cache; + +#endif /* __KERNEL__ */ + +#endif /* _LINUX_SUNRPC_SVCAUTH_H_ */ |