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
  12 #ifndef _LINUX_SUNRPC_GSS_API_H
  13 #define _LINUX_SUNRPC_GSS_API_H
  14
  15 #ifdef __KERNEL__
  16 #include <linux/sunrpc/xdr.h>
  17 #include <linux/uio.h>
  18
  19 /* The mechanism-independent gss-api context: */
  20 struct gss_ctx {
  21         struct gss_api_mech     *mech_type;
  22         void                    *internal_ctx_id;
  23 };
  24
  25 #define GSS_C_NO_BUFFER         ((struct xdr_netobj) 0)
  26 #define GSS_C_NO_CONTEXT        ((struct gss_ctx *) 0)
  27 #define GSS_C_NULL_OID          ((struct xdr_netobj) 0)
  28
  29 /*XXX  arbitrary length - is this set somewhere? */
  30 #define GSS_OID_MAX_LEN 32
  31
  32 /* gss-api prototypes; note that these are somewhat simplified versions of
  33  * the prototypes specified in RFC 2744. */
  34 int gss_import_sec_context(
  35                 const void*             input_token,
  36                 size_t                  bufsize,
  37                 struct gss_api_mech     *mech,
  38                 struct gss_ctx          **ctx_id,
  39                 gfp_t                   gfp_mask);
  40 u32 gss_get_mic(
  41                 struct gss_ctx          *ctx_id,
  42                 struct xdr_buf          *message,
  43                 struct xdr_netobj       *mic_token);
  44 u32 gss_verify_mic(
  45                 struct gss_ctx          *ctx_id,
  46                 struct xdr_buf          *message,
  47                 struct xdr_netobj       *mic_token);
  48 u32 gss_wrap(
  49                 struct gss_ctx          *ctx_id,
  50                 int                     offset,
  51                 struct xdr_buf          *outbuf,
  52                 struct page             **inpages);
  53 u32 gss_unwrap(
  54                 struct gss_ctx          *ctx_id,
  55                 int                     offset,
  56                 struct xdr_buf          *inbuf);
  57 u32 gss_delete_sec_context(
  58                 struct gss_ctx          **ctx_id);
  59
  60 u32 gss_svc_to_pseudoflavor(struct gss_api_mech *, u32 service);
  61 u32 gss_pseudoflavor_to_service(struct gss_api_mech *, u32 pseudoflavor);
  62 char *gss_service_to_auth_domain_name(struct gss_api_mech *, u32 service);
  63
  64 struct pf_desc {
  65         u32     pseudoflavor;
  66         u32     service;
  67         char    *name;
  68         char    *auth_domain_name;
  69 };
  70
  71 /* Different mechanisms (e.g., krb5 or spkm3) may implement gss-api, and
  72  * mechanisms may be dynamically registered or unregistered by modules. */
  73
  74 /* Each mechanism is described by the following struct: */
  75 struct gss_api_mech {
  76         struct list_head        gm_list;
  77         struct module           *gm_owner;
  78         struct xdr_netobj       gm_oid;
  79         char                    *gm_name;
  80         const struct gss_api_ops *gm_ops;
  81         /* pseudoflavors supported by this mechanism: */
  82         int                     gm_pf_num;
  83         struct pf_desc *        gm_pfs;
  84         /* Should the following be a callback operation instead? */
  85         const char              *gm_upcall_enctypes;
  86 };
  87
  88 /* and must provide the following operations: */
  89 struct gss_api_ops {
  90         int (*gss_import_sec_context)(
  91                         const void              *input_token,
  92                         size_t                  bufsize,
  93                         struct gss_ctx          *ctx_id,
  94                         gfp_t                   gfp_mask);
  95         u32 (*gss_get_mic)(
  96                         struct gss_ctx          *ctx_id,
  97                         struct xdr_buf          *message,
  98                         struct xdr_netobj       *mic_token);
  99         u32 (*gss_verify_mic)(
 100                         struct gss_ctx          *ctx_id,
 101                         struct xdr_buf          *message,
 102                         struct xdr_netobj       *mic_token);
 103         u32 (*gss_wrap)(
 104                         struct gss_ctx          *ctx_id,
 105                         int                     offset,
 106                         struct xdr_buf          *outbuf,
 107                         struct page             **inpages);
 108         u32 (*gss_unwrap)(
 109                         struct gss_ctx          *ctx_id,
 110                         int                     offset,
 111                         struct xdr_buf          *buf);
 112         void (*gss_delete_sec_context)(
 113                         void                    *internal_ctx_id);
 114 };
 115
 116 int gss_mech_register(struct gss_api_mech *);
 117 void gss_mech_unregister(struct gss_api_mech *);
 118
 119 /* returns a mechanism descriptor given an OID, and increments the mechanism's
 120  * reference count. */
 121 struct gss_api_mech * gss_mech_get_by_OID(struct xdr_netobj *);
 122
 123 /* Returns a reference to a mechanism, given a name like "krb5" etc. */
 124 struct gss_api_mech *gss_mech_get_by_name(const char *);
 125
 126 /* Similar, but get by pseudoflavor. */
 127 struct gss_api_mech *gss_mech_get_by_pseudoflavor(u32);
 128
 129 /* Just increments the mechanism's reference count and returns its input: */
 130 struct gss_api_mech * gss_mech_get(struct gss_api_mech *);
 131
 132 /* For every successful gss_mech_get or gss_mech_get_by_* call there must be a
 133  * corresponding call to gss_mech_put. */
 134 void gss_mech_put(struct gss_api_mech *);
 135
 136 #endif /* __KERNEL__ */
 137 #endif /* _LINUX_SUNRPC_GSS_API_H */
 138