include/linux/sunrpc/gss_api.h

   1 /*
   2  * linux/include/linux/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                 u32                     qop,
  44                 struct xdr_buf          *message,
  45                 struct xdr_netobj       *mic_token);
  46 u32 gss_verify_mic(
  47                 struct gss_ctx          *ctx_id,
  48                 struct xdr_buf          *message,
  49                 struct xdr_netobj       *mic_token,
  50                 u32                     *qstate);
  51 u32 gss_wrap(
  52                 struct gss_ctx          *ctx_id,
  53                 u32                     qop,
  54                 int                     offset,
  55                 struct xdr_buf          *outbuf,
  56                 struct page             **inpages);
  57 u32 gss_unwrap(
  58                 struct gss_ctx          *ctx_id,
  59                 u32                     *qop,
  60                 int                     offset,
  61                 struct xdr_buf          *inbuf);
  62 u32 gss_delete_sec_context(
  63                 struct gss_ctx          **ctx_id);
  64
  65 u32 gss_pseudoflavor_to_service(struct gss_api_mech *, u32 pseudoflavor);
  66 char *gss_service_to_auth_domain_name(struct gss_api_mech *, u32 service);
  67
  68 struct pf_desc {
  69         u32     pseudoflavor;
  70         u32     qop;
  71         u32     service;
  72         char    *name;
  73         char    *auth_domain_name;
  74 };
  75
  76 /* Different mechanisms (e.g., krb5 or spkm3) may implement gss-api, and
  77  * mechanisms may be dynamically registered or unregistered by modules. */
  78
  79 /* Each mechanism is described by the following struct: */
  80 struct gss_api_mech {
  81         struct list_head        gm_list;
  82         struct module           *gm_owner;
  83         struct xdr_netobj       gm_oid;
  84         char                    *gm_name;
  85         struct gss_api_ops      *gm_ops;
  86         /* pseudoflavors supported by this mechanism: */
  87         int                     gm_pf_num;
  88         struct pf_desc *        gm_pfs;
  89 };
  90
  91 /* and must provide the following operations: */
  92 struct gss_api_ops {
  93         int (*gss_import_sec_context)(
  94                         const void              *input_token,
  95                         size_t                  bufsize,
  96                         struct gss_ctx          *ctx_id);
  97         u32 (*gss_get_mic)(
  98                         struct gss_ctx          *ctx_id,
  99                         u32                     qop,
 100                         struct xdr_buf          *message,
 101                         struct xdr_netobj       *mic_token);
 102         u32 (*gss_verify_mic)(
 103                         struct gss_ctx          *ctx_id,
 104                         struct xdr_buf          *message,
 105                         struct xdr_netobj       *mic_token,
 106                         u32                     *qstate);
 107         u32 (*gss_wrap)(
 108                         struct gss_ctx          *ctx_id,
 109                         u32                     qop,
 110                         int                     offset,
 111                         struct xdr_buf          *outbuf,
 112                         struct page             **inpages);
 113         u32 (*gss_unwrap)(
 114                         struct gss_ctx          *ctx_id,
 115                         u32                     *qop,
 116                         int                     offset,
 117                         struct xdr_buf          *buf);
 118         void (*gss_delete_sec_context)(
 119                         void                    *internal_ctx_id);
 120 };
 121
 122 int gss_mech_register(struct gss_api_mech *);
 123 void gss_mech_unregister(struct gss_api_mech *);
 124
 125 /* returns a mechanism descriptor given an OID, and increments the mechanism's
 126  * reference count. */
 127 struct gss_api_mech * gss_mech_get_by_OID(struct xdr_netobj *);
 128
 129 /* Returns a reference to a mechanism, given a name like "krb5" etc. */
 130 struct gss_api_mech *gss_mech_get_by_name(const char *);
 131
 132 /* Similar, but get by pseudoflavor. */
 133 struct gss_api_mech *gss_mech_get_by_pseudoflavor(u32);
 134
 135 /* Just increments the mechanism's reference count and returns its input: */
 136 struct gss_api_mech * gss_mech_get(struct gss_api_mech *);
 137
 138 /* For every succesful gss_mech_get or gss_mech_get_by_* call there must be a
 139  * corresponding call to gss_mech_put. */
 140 void gss_mech_put(struct gss_api_mech *);
 141
 142 #endif /* __KERNEL__ */
 143 #endif /* _LINUX_SUNRPC_GSS_API_H */
 144