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/sunrpc/msg_prot.h>
  18 #include <linux/uio.h>
  19
  20 /* The mechanism-independent gss-api context: */
  21 struct gss_ctx {
  22         struct gss_api_mech     *mech_type;
  23         void                    *internal_ctx_id;
  24 };
  25
  26 #define GSS_C_NO_BUFFER         ((struct xdr_netobj) 0)
  27 #define GSS_C_NO_CONTEXT        ((struct gss_ctx *) 0)
  28 #define GSS_C_QOP_DEFAULT       (0)
  29
  30 /*XXX  arbitrary length - is this set somewhere? */
  31 #define GSS_OID_MAX_LEN 32
  32 struct rpcsec_gss_oid {
  33         unsigned int    len;
  34         u8              data[GSS_OID_MAX_LEN];
  35 };
  36
  37 /* From RFC 3530 */
  38 struct rpcsec_gss_info {
  39         struct rpcsec_gss_oid   oid;
  40         u32                     qop;
  41         u32                     service;
  42 };
  43
  44 /* gss-api prototypes; note that these are somewhat simplified versions of
  45  * the prototypes specified in RFC 2744. */
  46 int gss_import_sec_context(
  47                 const void*             input_token,
  48                 size_t                  bufsize,
  49                 struct gss_api_mech     *mech,
  50                 struct gss_ctx          **ctx_id,
  51                 gfp_t                   gfp_mask);
  52 u32 gss_get_mic(
  53                 struct gss_ctx          *ctx_id,
  54                 struct xdr_buf          *message,
  55                 struct xdr_netobj       *mic_token);
  56 u32 gss_verify_mic(
  57                 struct gss_ctx          *ctx_id,
  58                 struct xdr_buf          *message,
  59                 struct xdr_netobj       *mic_token);
  60 u32 gss_wrap(
  61                 struct gss_ctx          *ctx_id,
  62                 int                     offset,
  63                 struct xdr_buf          *outbuf,
  64                 struct page             **inpages);
  65 u32 gss_unwrap(
  66                 struct gss_ctx          *ctx_id,
  67                 int                     offset,
  68                 struct xdr_buf          *inbuf);
  69 u32 gss_delete_sec_context(
  70                 struct gss_ctx          **ctx_id);
  71
  72 rpc_authflavor_t gss_svc_to_pseudoflavor(struct gss_api_mech *, u32 qop,
  73                                         u32 service);
  74 u32 gss_pseudoflavor_to_service(struct gss_api_mech *, u32 pseudoflavor);
  75 char *gss_service_to_auth_domain_name(struct gss_api_mech *, u32 service);
  76
  77 struct pf_desc {
  78         u32     pseudoflavor;
  79         u32     qop;
  80         u32     service;
  81         char    *name;
  82         char    *auth_domain_name;
  83 };
  84
  85 /* Different mechanisms (e.g., krb5 or spkm3) may implement gss-api, and
  86  * mechanisms may be dynamically registered or unregistered by modules. */
  87
  88 /* Each mechanism is described by the following struct: */
  89 struct gss_api_mech {
  90         struct list_head        gm_list;
  91         struct module           *gm_owner;
  92         struct rpcsec_gss_oid   gm_oid;
  93         char                    *gm_name;
  94         const struct gss_api_ops *gm_ops;
  95         /* pseudoflavors supported by this mechanism: */
  96         int                     gm_pf_num;
  97         struct pf_desc *        gm_pfs;
  98         /* Should the following be a callback operation instead? */
  99         const char              *gm_upcall_enctypes;
 100 };
 101
 102 /* and must provide the following operations: */
 103 struct gss_api_ops {
 104         int (*gss_import_sec_context)(
 105                         const void              *input_token,
 106                         size_t                  bufsize,
 107                         struct gss_ctx          *ctx_id,
 108                         gfp_t                   gfp_mask);
 109         u32 (*gss_get_mic)(
 110                         struct gss_ctx          *ctx_id,
 111                         struct xdr_buf          *message,
 112                         struct xdr_netobj       *mic_token);
 113         u32 (*gss_verify_mic)(
 114                         struct gss_ctx          *ctx_id,
 115                         struct xdr_buf          *message,
 116                         struct xdr_netobj       *mic_token);
 117         u32 (*gss_wrap)(
 118                         struct gss_ctx          *ctx_id,
 119                         int                     offset,
 120                         struct xdr_buf          *outbuf,
 121                         struct page             **inpages);
 122         u32 (*gss_unwrap)(
 123                         struct gss_ctx          *ctx_id,
 124                         int                     offset,
 125                         struct xdr_buf          *buf);
 126         void (*gss_delete_sec_context)(
 127                         void                    *internal_ctx_id);
 128 };
 129
 130 int gss_mech_register(struct gss_api_mech *);
 131 void gss_mech_unregister(struct gss_api_mech *);
 132
 133 /* Given a GSS security tuple, look up a pseudoflavor */
 134 rpc_authflavor_t gss_mech_info2flavor(struct rpcsec_gss_info *);
 135
 136 /* Given a pseudoflavor, look up a GSS security tuple */
 137 int gss_mech_flavor2info(rpc_authflavor_t, struct rpcsec_gss_info *);
 138
 139 /* Returns a reference to a mechanism, given a name like "krb5" etc. */
 140 struct gss_api_mech *gss_mech_get_by_name(const char *);
 141
 142 /* Similar, but get by pseudoflavor. */
 143 struct gss_api_mech *gss_mech_get_by_pseudoflavor(u32);
 144
 145 /* Fill in an array with a list of supported pseudoflavors */
 146 int gss_mech_list_pseudoflavors(rpc_authflavor_t *, int);
 147
 148 /* For every successful gss_mech_get or gss_mech_get_by_* call there must be a
 149  * corresponding call to gss_mech_put. */
 150 void gss_mech_put(struct gss_api_mech *);
 151
 152 #endif /* __KERNEL__ */
 153 #endif /* _LINUX_SUNRPC_GSS_API_H */
 154