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423 giacomo 1
/*
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 * linux/include/linux/gss_api.h
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 *
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 * Somewhat simplified version of the gss api.
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 *
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 * Dug Song <dugsong@monkey.org>
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 * Andy Adamson <andros@umich.edu>
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 * Bruce Fields <bfields@umich.edu>
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 * Copyright (c) 2000 The Regents of the University of Michigan
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 *
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 * $Id: gss_api.h,v 1.1 2004-01-28 15:31:11 giacomo Exp $
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 */
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#ifndef _LINUX_SUNRPC_GSS_API_H
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#define _LINUX_SUNRPC_GSS_API_H
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#ifdef __KERNEL__
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#include <linux/sunrpc/xdr.h>
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/* The mechanism-independent gss-api context: */
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struct gss_ctx {
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        struct gss_api_mech     *mech_type;
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        void                    *internal_ctx_id;
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};
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#define GSS_C_NO_BUFFER         ((struct xdr_netobj) 0)
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#define GSS_C_NO_CONTEXT        ((struct gss_ctx *) 0)
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#define GSS_C_NULL_OID          ((struct xdr_netobj) 0)
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/*XXX  arbitrary length - is this set somewhere? */
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#define GSS_OID_MAX_LEN 32
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/* gss-api prototypes; note that these are somewhat simplified versions of
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 * the prototypes specified in RFC 2744. */
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u32 gss_import_sec_context(
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                struct xdr_netobj       *input_token,
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                struct gss_api_mech     *mech,
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                struct gss_ctx          **ctx_id);
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u32 gss_get_mic(
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                struct gss_ctx          *ctx_id,
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                u32                     qop,
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                struct xdr_netobj       *message,
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                struct xdr_netobj       *mic_token);
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u32 gss_verify_mic(
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                struct gss_ctx          *ctx_id,
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                struct xdr_netobj       *message,
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                struct xdr_netobj       *mic_token,
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                u32                     *qstate);
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u32 gss_delete_sec_context(
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                struct gss_ctx          **ctx_id);
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/* We maintain a list of the pseudoflavors (equivalently, mechanism-qop-service
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 * triples) that we currently support: */
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struct sup_sec_triple {
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        struct list_head        triples;
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        u32                     pseudoflavor;
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        struct gss_api_mech     *mech;
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        u32                     qop;
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        u32                     service;
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};
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int gss_register_triple(u32 pseudoflavor, struct gss_api_mech *mech, u32 qop,
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                        u32 service);
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int gss_unregister_triple(u32 pseudoflavor);
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int gss_pseudoflavor_supported(u32 pseudoflavor);
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u32 gss_cmp_triples(u32 oid_len, char *oid_data, u32 qop, u32 service);
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u32 gss_get_pseudoflavor(struct gss_ctx *ctx_id, u32 qop, u32 service);
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u32 gss_pseudoflavor_to_service(u32 pseudoflavor);
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/* Both return NULL on failure: */
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struct gss_api_mech * gss_pseudoflavor_to_mech(u32 pseudoflavor);
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int gss_pseudoflavor_to_mechOID(u32 pseudoflavor, struct xdr_netobj *mech);
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/* Different mechanisms (e.g., krb5 or spkm3) may implement gss-api, and
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 * mechanisms may be dynamically registered or unregistered by modules.
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 * Our only built-in mechanism is a trivial debugging mechanism that provides
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 * no actual security; the following function registers that mechanism: */
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void gss_mech_register_debug(void);
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/* Each mechanism is described by the following struct: */
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struct gss_api_mech {
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        struct xdr_netobj       gm_oid;
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        struct list_head        gm_list;
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        atomic_t                gm_count;
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        struct gss_api_ops      *gm_ops;
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};
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/* and must provide the following operations: */
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struct gss_api_ops {
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        char *name;
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        u32 (*gss_import_sec_context)(
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                        struct xdr_netobj       *input_token,
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                        struct gss_ctx          *ctx_id);
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        u32 (*gss_get_mic)(
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                        struct gss_ctx          *ctx_id,
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                        u32                     qop,
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                        struct xdr_netobj       *message,
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                        struct xdr_netobj       *mic_token);
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        u32 (*gss_verify_mic)(
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                        struct gss_ctx          *ctx_id,
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                        struct xdr_netobj       *message,
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                        struct xdr_netobj       *mic_token,
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                        u32                     *qstate);
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        void (*gss_delete_sec_context)(
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                        void                    *internal_ctx_id);
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};
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/* Returns nonzero on failure. */
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int gss_mech_register(struct xdr_netobj *, struct gss_api_ops *);
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/* Returns nonzero iff someone still has a reference to this mech. */
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int gss_mech_unregister(struct gss_api_mech *);
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/* Returns nonzer iff someone still has a reference to some mech. */
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int gss_mech_unregister_all(void);
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/* returns a mechanism descriptor given an OID, an increments the mechanism's
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 * reference count. */
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struct gss_api_mech * gss_mech_get_by_OID(struct xdr_netobj *);
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/* Just increments the mechanism's reference count and returns its input: */
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struct gss_api_mech * gss_mech_get(struct gss_api_mech *);
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/* Returns nonzero iff you've released the last reference to this mech.
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 * Note that for every succesful gss_get_mech call there must be exactly
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 * one corresponding call to gss_mech_put.*/
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int gss_mech_put(struct gss_api_mech *);
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#endif /* __KERNEL__ */
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#endif /* _LINUX_SUNRPC_GSS_API_H */
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