include/linux/sunrpc/gss_api.h

   1 /*
   2  * linux/include/linux/sunrpc/gss_api.h
   3  *
   4  * Somewhat simplified version of the gss api.
   5  *
   6  * Dug Song <dugsong@monkey.org>
   7  * Andy Adamson <andros@umich.edu>
   8  * Bruce Fields <bfields@umich.edu>
   9  * Copyright (c) 2000 The Regents of the University of Michigan
  10  *
  11  * $Id$
  12  */
  13
  14 #ifndef _LINUX_SUNRPC_GSS_API_H
  15 #define _LINUX_SUNRPC_GSS_API_H
  16
  17 #ifdef __KERNEL__
  18 #include <linux/sunrpc/xdr.h>
  19 #include <linux/uio.h>
  20
  21 /* The mechanism-independent gss-api context: */
  22 struct gss_ctx {
  23         struct gss_api_mech     *mech_type;
  24         void                    *internal_ctx_id;
  25 };
  26
  27 #define GSS_C_NO_BUFFER         ((struct xdr_netobj) 0)
  28 #define GSS_C_NO_CONTEXT        ((struct gss_ctx *) 0)
  29 #define GSS_C_NULL_OID          ((struct xdr_netobj) 0)
  30
  31 /*XXX  arbitrary length - is this set somewhere? */
  32 #define GSS_OID_MAX_LEN 32
  33
  34 /* gss-api prototypes; note that these are somewhat simplified versions of
  35  * the prototypes specified in RFC 2744. */
  36 int gss_import_sec_context(
  37                 const void*             input_token,
  38                 size_t                  bufsize,
  39                 struct gss_api_mech     *mech,
  40                 struct gss_ctx          **ctx_id);
  41 u32 gss_get_mic(
  42                 struct gss_ctx          *ctx_id,
  43                 struct xdr_buf          *message,
  44                 struct xdr_netobj       *mic_token);
  45 u32 gss_verify_mic(
  46                 struct gss_ctx          *ctx_id,
  47                 struct xdr_buf          *message,
  48                 struct xdr_netobj       *mic_token);
  49 u32 gss_wrap(
  50                 struct gss_ctx          *ctx_id,
  51                 int                     offset,
  52                 struct xdr_buf          *outbuf,
  53                 struct page             **inpages);
  54 u32 gss_unwrap(
  55                 struct gss_ctx          *ctx_id,
  56                 int                     offset,
  57                 struct xdr_buf          *inbuf);
  58 u32 gss_delete_sec_context(
  59                 struct gss_ctx          **ctx_id);
  60
  61 u32 gss_svc_to_pseudoflavor(struct gss_api_mech *, u32 service);
  62 u32 gss_pseudoflavor_to_service(struct gss_api_mech *, u32 pseudoflavor);
  63 char *gss_service_to_auth_domain_name(struct gss_api_mech *, u32 service);
  64
  65 struct pf_desc {
  66         u32     pseudoflavor;
  67         u32     service;
  68         char    *name;
  69         char    *auth_domain_name;
  70 };
  71
  72 /* Different mechanisms (e.g., krb5 or spkm3) may implement gss-api, and
  73  * mechanisms may be dynamically registered or unregistered by modules. */
  74
  75 /* Each mechanism is described by the following struct: */
  76 struct gss_api_mech {
  77         struct list_head        gm_list;
  78         struct module           *gm_owner;
  79         struct xdr_netobj       gm_oid;
  80         char                    *gm_name;
  81         const struct gss_api_ops *gm_ops;
  82         /* pseudoflavors supported by this mechanism: */
  83         int                     gm_pf_num;
  84         struct pf_desc *        gm_pfs;
  85 };
  86
  87 /* and must provide the following operations: */
  88 struct gss_api_ops {
  89         int (*gss_import_sec_context)(
  90                         const void              *input_token,
  91                         size_t                  bufsize,
  92                         struct gss_ctx          *ctx_id);
  93         u32 (*gss_get_mic)(
  94                         struct gss_ctx          *ctx_id,
  95                         struct xdr_buf          *message,
  96                         struct xdr_netobj       *mic_token);
  97         u32 (*gss_verify_mic)(
  98                         struct gss_ctx          *ctx_id,
  99                         struct xdr_buf          *message,
 100                         struct xdr_netobj       *mic_token);
 101         u32 (*gss_wrap)(
 102                         struct gss_ctx          *ctx_id,
 103                         int                     offset,
 104                         struct xdr_buf          *outbuf,
 105                         struct page             **inpages);
 106         u32 (*gss_unwrap)(
 107                         struct gss_ctx          *ctx_id,
 108                         int                     offset,
 109                         struct xdr_buf          *buf);
 110         void (*gss_delete_sec_context)(
 111                         void                    *internal_ctx_id);
 112 };
 113
 114 int gss_mech_register(struct gss_api_mech *);
 115 void gss_mech_unregister(struct gss_api_mech *);
 116
 117 /* returns a mechanism descriptor given an OID, and increments the mechanism's
 118  * reference count. */
 119 struct gss_api_mech * gss_mech_get_by_OID(struct xdr_netobj *);
 120
 121 /* Returns a reference to a mechanism, given a name like "krb5" etc. */
 122 struct gss_api_mech *gss_mech_get_by_name(const char *);
 123
 124 /* Similar, but get by pseudoflavor. */
 125 struct gss_api_mech *gss_mech_get_by_pseudoflavor(u32);
 126
 127 /* Just increments the mechanism's reference count and returns its input: */
 128 struct gss_api_mech * gss_mech_get(struct gss_api_mech *);
 129
 130 /* For every successful gss_mech_get or gss_mech_get_by_* call there must be a
 131  * corresponding call to gss_mech_put. */
 132 void gss_mech_put(struct gss_api_mech *);
 133
 134 #endif /* __KERNEL__ */
 135 #endif /* _LINUX_SUNRPC_GSS_API_H */
 136