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Linux/include/linux/sunrpc/gss_api.h

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  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                 time_t                  *endtime,
 52                 gfp_t                   gfp_mask);
 53 u32 gss_get_mic(
 54                 struct gss_ctx          *ctx_id,
 55                 struct xdr_buf          *message,
 56                 struct xdr_netobj       *mic_token);
 57 u32 gss_verify_mic(
 58                 struct gss_ctx          *ctx_id,
 59                 struct xdr_buf          *message,
 60                 struct xdr_netobj       *mic_token);
 61 u32 gss_wrap(
 62                 struct gss_ctx          *ctx_id,
 63                 int                     offset,
 64                 struct xdr_buf          *outbuf,
 65                 struct page             **inpages);
 66 u32 gss_unwrap(
 67                 struct gss_ctx          *ctx_id,
 68                 int                     offset,
 69                 struct xdr_buf          *inbuf);
 70 u32 gss_delete_sec_context(
 71                 struct gss_ctx          **ctx_id);
 72 
 73 rpc_authflavor_t gss_svc_to_pseudoflavor(struct gss_api_mech *, u32 qop,
 74                                         u32 service);
 75 u32 gss_pseudoflavor_to_service(struct gss_api_mech *, u32 pseudoflavor);
 76 char *gss_service_to_auth_domain_name(struct gss_api_mech *, u32 service);
 77 
 78 struct pf_desc {
 79         u32     pseudoflavor;
 80         u32     qop;
 81         u32     service;
 82         char    *name;
 83         char    *auth_domain_name;
 84 };
 85 
 86 /* Different mechanisms (e.g., krb5 or spkm3) may implement gss-api, and
 87  * mechanisms may be dynamically registered or unregistered by modules. */
 88 
 89 /* Each mechanism is described by the following struct: */
 90 struct gss_api_mech {
 91         struct list_head        gm_list;
 92         struct module           *gm_owner;
 93         struct rpcsec_gss_oid   gm_oid;
 94         char                    *gm_name;
 95         const struct gss_api_ops *gm_ops;
 96         /* pseudoflavors supported by this mechanism: */
 97         int                     gm_pf_num;
 98         struct pf_desc *        gm_pfs;
 99         /* Should the following be a callback operation instead? */
100         const char              *gm_upcall_enctypes;
101 };
102 
103 /* and must provide the following operations: */
104 struct gss_api_ops {
105         int (*gss_import_sec_context)(
106                         const void              *input_token,
107                         size_t                  bufsize,
108                         struct gss_ctx          *ctx_id,
109                         time_t                  *endtime,
110                         gfp_t                   gfp_mask);
111         u32 (*gss_get_mic)(
112                         struct gss_ctx          *ctx_id,
113                         struct xdr_buf          *message,
114                         struct xdr_netobj       *mic_token);
115         u32 (*gss_verify_mic)(
116                         struct gss_ctx          *ctx_id,
117                         struct xdr_buf          *message,
118                         struct xdr_netobj       *mic_token);
119         u32 (*gss_wrap)(
120                         struct gss_ctx          *ctx_id,
121                         int                     offset,
122                         struct xdr_buf          *outbuf,
123                         struct page             **inpages);
124         u32 (*gss_unwrap)(
125                         struct gss_ctx          *ctx_id,
126                         int                     offset,
127                         struct xdr_buf          *buf);
128         void (*gss_delete_sec_context)(
129                         void                    *internal_ctx_id);
130 };
131 
132 int gss_mech_register(struct gss_api_mech *);
133 void gss_mech_unregister(struct gss_api_mech *);
134 
135 /* returns a mechanism descriptor given an OID, and increments the mechanism's
136  * reference count. */
137 struct gss_api_mech * gss_mech_get_by_OID(struct rpcsec_gss_oid *);
138 
139 /* Given a GSS security tuple, look up a pseudoflavor */
140 rpc_authflavor_t gss_mech_info2flavor(struct rpcsec_gss_info *);
141 
142 /* Given a pseudoflavor, look up a GSS security tuple */
143 int gss_mech_flavor2info(rpc_authflavor_t, struct rpcsec_gss_info *);
144 
145 /* Returns a reference to a mechanism, given a name like "krb5" etc. */
146 struct gss_api_mech *gss_mech_get_by_name(const char *);
147 
148 /* Similar, but get by pseudoflavor. */
149 struct gss_api_mech *gss_mech_get_by_pseudoflavor(u32);
150 
151 /* Fill in an array with a list of supported pseudoflavors */
152 int gss_mech_list_pseudoflavors(rpc_authflavor_t *, int);
153 
154 /* For every successful gss_mech_get or gss_mech_get_by_* call there must be a
155  * corresponding call to gss_mech_put. */
156 void gss_mech_put(struct gss_api_mech *);
157 
158 #endif /* __KERNEL__ */
159 #endif /* _LINUX_SUNRPC_GSS_API_H */
160 
161 

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