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Linux/include/linux/sunrpc/gss_api.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  * linux/include/linux/sunrpc/gss_api.h
  4  *
  5  * Somewhat simplified version of the gss api.
  6  *
  7  * Dug Song <dugsong@monkey.org>
  8  * Andy Adamson <andros@umich.edu>
  9  * Bruce Fields <bfields@umich.edu>
 10  * Copyright (c) 2000 The Regents of the University of Michigan
 11  */
 12 
 13 #ifndef _LINUX_SUNRPC_GSS_API_H
 14 #define _LINUX_SUNRPC_GSS_API_H
 15 
 16 #ifdef __KERNEL__
 17 #include <linux/sunrpc/xdr.h>
 18 #include <linux/sunrpc/msg_prot.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_QOP_DEFAULT       (0)
 30 
 31 /*XXX  arbitrary length - is this set somewhere? */
 32 #define GSS_OID_MAX_LEN 32
 33 struct rpcsec_gss_oid {
 34         unsigned int    len;
 35         u8              data[GSS_OID_MAX_LEN];
 36 };
 37 
 38 /* From RFC 3530 */
 39 struct rpcsec_gss_info {
 40         struct rpcsec_gss_oid   oid;
 41         u32                     qop;
 42         u32                     service;
 43 };
 44 
 45 /* gss-api prototypes; note that these are somewhat simplified versions of
 46  * the prototypes specified in RFC 2744. */
 47 int gss_import_sec_context(
 48                 const void*             input_token,
 49                 size_t                  bufsize,
 50                 struct gss_api_mech     *mech,
 51                 struct gss_ctx          **ctx_id,
 52                 time_t                  *endtime,
 53                 gfp_t                   gfp_mask);
 54 u32 gss_get_mic(
 55                 struct gss_ctx          *ctx_id,
 56                 struct xdr_buf          *message,
 57                 struct xdr_netobj       *mic_token);
 58 u32 gss_verify_mic(
 59                 struct gss_ctx          *ctx_id,
 60                 struct xdr_buf          *message,
 61                 struct xdr_netobj       *mic_token);
 62 u32 gss_wrap(
 63                 struct gss_ctx          *ctx_id,
 64                 int                     offset,
 65                 struct xdr_buf          *outbuf,
 66                 struct page             **inpages);
 67 u32 gss_unwrap(
 68                 struct gss_ctx          *ctx_id,
 69                 int                     offset,
 70                 struct xdr_buf          *inbuf);
 71 u32 gss_delete_sec_context(
 72                 struct gss_ctx          **ctx_id);
 73 
 74 rpc_authflavor_t gss_svc_to_pseudoflavor(struct gss_api_mech *, u32 qop,
 75                                         u32 service);
 76 u32 gss_pseudoflavor_to_service(struct gss_api_mech *, u32 pseudoflavor);
 77 bool gss_pseudoflavor_to_datatouch(struct gss_api_mech *, u32 pseudoflavor);
 78 char *gss_service_to_auth_domain_name(struct gss_api_mech *, u32 service);
 79 
 80 struct pf_desc {
 81         u32     pseudoflavor;
 82         u32     qop;
 83         u32     service;
 84         char    *name;
 85         char    *auth_domain_name;
 86         bool    datatouch;
 87 };
 88 
 89 /* Different mechanisms (e.g., krb5 or spkm3) may implement gss-api, and
 90  * mechanisms may be dynamically registered or unregistered by modules. */
 91 
 92 /* Each mechanism is described by the following struct: */
 93 struct gss_api_mech {
 94         struct list_head        gm_list;
 95         struct module           *gm_owner;
 96         struct rpcsec_gss_oid   gm_oid;
 97         char                    *gm_name;
 98         const struct gss_api_ops *gm_ops;
 99         /* pseudoflavors supported by this mechanism: */
100         int                     gm_pf_num;
101         struct pf_desc *        gm_pfs;
102         /* Should the following be a callback operation instead? */
103         const char              *gm_upcall_enctypes;
104 };
105 
106 /* and must provide the following operations: */
107 struct gss_api_ops {
108         int (*gss_import_sec_context)(
109                         const void              *input_token,
110                         size_t                  bufsize,
111                         struct gss_ctx          *ctx_id,
112                         time_t                  *endtime,
113                         gfp_t                   gfp_mask);
114         u32 (*gss_get_mic)(
115                         struct gss_ctx          *ctx_id,
116                         struct xdr_buf          *message,
117                         struct xdr_netobj       *mic_token);
118         u32 (*gss_verify_mic)(
119                         struct gss_ctx          *ctx_id,
120                         struct xdr_buf          *message,
121                         struct xdr_netobj       *mic_token);
122         u32 (*gss_wrap)(
123                         struct gss_ctx          *ctx_id,
124                         int                     offset,
125                         struct xdr_buf          *outbuf,
126                         struct page             **inpages);
127         u32 (*gss_unwrap)(
128                         struct gss_ctx          *ctx_id,
129                         int                     offset,
130                         struct xdr_buf          *buf);
131         void (*gss_delete_sec_context)(
132                         void                    *internal_ctx_id);
133 };
134 
135 int gss_mech_register(struct gss_api_mech *);
136 void gss_mech_unregister(struct gss_api_mech *);
137 
138 /* returns a mechanism descriptor given an OID, and increments the mechanism's
139  * reference count. */
140 struct gss_api_mech * gss_mech_get_by_OID(struct rpcsec_gss_oid *);
141 
142 /* Given a GSS security tuple, look up a pseudoflavor */
143 rpc_authflavor_t gss_mech_info2flavor(struct rpcsec_gss_info *);
144 
145 /* Given a pseudoflavor, look up a GSS security tuple */
146 int gss_mech_flavor2info(rpc_authflavor_t, struct rpcsec_gss_info *);
147 
148 /* Returns a reference to a mechanism, given a name like "krb5" etc. */
149 struct gss_api_mech *gss_mech_get_by_name(const char *);
150 
151 /* Similar, but get by pseudoflavor. */
152 struct gss_api_mech *gss_mech_get_by_pseudoflavor(u32);
153 
154 /* Fill in an array with a list of supported pseudoflavors */
155 int gss_mech_list_pseudoflavors(rpc_authflavor_t *, int);
156 
157 struct gss_api_mech * gss_mech_get(struct gss_api_mech *);
158 
159 /* For every successful gss_mech_get or gss_mech_get_by_* call there must be a
160  * corresponding call to gss_mech_put. */
161 void gss_mech_put(struct gss_api_mech *);
162 
163 #endif /* __KERNEL__ */
164 #endif /* _LINUX_SUNRPC_GSS_API_H */
165 
166 

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