The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/rpc/rpcsec_gss.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2008 Doug Rabson
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  *      $FreeBSD$
   29  */
   30 
   31 #ifndef _RPCSEC_GSS_H
   32 #define _RPCSEC_GSS_H
   33 
   34 #include <kgssapi/gssapi.h>
   35 
   36 #ifndef MAX_GSS_MECH
   37 #define MAX_GSS_MECH    64
   38 #endif
   39 
   40 /*
   41  * Define the types of security service required for rpc_gss_seccreate().
   42  */
   43 typedef enum {
   44         rpc_gss_svc_default     = 0,
   45         rpc_gss_svc_none        = 1,
   46         rpc_gss_svc_integrity   = 2,
   47         rpc_gss_svc_privacy     = 3
   48 } rpc_gss_service_t;
   49 
   50 /*
   51  * Structure containing options for rpc_gss_seccreate().
   52  */
   53 typedef struct {
   54         int             req_flags;      /* GSS request bits */
   55         int             time_req;       /* requested credential lifetime */
   56         gss_cred_id_t   my_cred;        /* GSS credential */
   57         gss_channel_bindings_t input_channel_bindings;
   58 } rpc_gss_options_req_t;
   59 
   60 /*
   61  * Structure containing options returned by rpc_gss_seccreate().
   62  */
   63 typedef struct {
   64         int             major_status;
   65         int             minor_status;
   66         u_int           rpcsec_version;
   67         int             ret_flags;
   68         int             time_req;
   69         gss_ctx_id_t    gss_context;
   70         char            actual_mechanism[MAX_GSS_MECH];
   71 } rpc_gss_options_ret_t;
   72 
   73 /*
   74  * Client principal type. Used as an argument to
   75  * rpc_gss_get_principal_name(). Also referenced by the
   76  * rpc_gss_rawcred_t structure.
   77  */
   78 typedef struct {
   79         int             len;
   80         char            name[1];
   81 } *rpc_gss_principal_t;
   82 
   83 /*
   84  * Structure for raw credentials used by rpc_gss_getcred() and
   85  * rpc_gss_set_callback().
   86  */
   87 typedef struct {
   88         u_int           version;        /* RPC version number */
   89         const char      *mechanism;     /* security mechanism */
   90         const char      *qop;           /* quality of protection */
   91         rpc_gss_principal_t client_principal; /* client name */
   92         const char      *svc_principal; /* server name */
   93         rpc_gss_service_t service;      /* service type */
   94 } rpc_gss_rawcred_t;
   95 
   96 /*
   97  * Unix credentials derived from raw credentials. Returned by
   98  * rpc_gss_getcred().
   99  */
  100 typedef struct {
  101         uid_t           uid;            /* user ID */
  102         gid_t           gid;            /* group ID */
  103         short           gidlen;
  104         gid_t           *gidlist;       /* list of groups */
  105 } rpc_gss_ucred_t;
  106 
  107 /*
  108  * Structure used to enforce a particular QOP and service.
  109  */
  110 typedef struct {
  111         bool_t          locked;
  112         rpc_gss_rawcred_t *raw_cred;
  113 } rpc_gss_lock_t;
  114 
  115 /*
  116  * Callback structure used by rpc_gss_set_callback().
  117  */
  118 typedef struct {
  119         u_int           program;        /* RPC program number */
  120         u_int           version;        /* RPC version number */
  121                                         /* user defined callback */
  122         bool_t          (*callback)(struct svc_req *req,
  123                                     gss_cred_id_t deleg,
  124                                     gss_ctx_id_t gss_context,
  125                                     rpc_gss_lock_t *lock,
  126                                     void **cookie);
  127 } rpc_gss_callback_t;
  128 
  129 /*
  130  * Structure used to return error information by rpc_gss_get_error()
  131  */
  132 typedef struct {
  133         int             rpc_gss_error;
  134         int             system_error;   /* same as errno */
  135 } rpc_gss_error_t;
  136 
  137 /*
  138  * Values for rpc_gss_error
  139  */
  140 #define RPC_GSS_ER_SUCCESS      0       /* no error */
  141 #define RPC_GSS_ER_SYSTEMERROR  1       /* system error */
  142 
  143 __BEGIN_DECLS
  144 
  145 #ifdef _KERNEL
  146 /*
  147  * Set up a structure of entry points for the kgssapi module and inline
  148  * functions named rpc_gss_XXX_call() to use them, so that the kgssapi
  149  * module doesn't need to be loaded for the NFS modules to work using
  150  * AUTH_SYS. The kgssapi modules will be loaded by the gssd(8) daemon
  151  * when it is started up and the entry points will then be filled in.
  152  */
  153 typedef AUTH    *rpc_gss_secfind_ftype(CLIENT *clnt, struct ucred *cred,
  154                     const char *principal, gss_OID mech_oid,
  155                     rpc_gss_service_t service);
  156 typedef void    rpc_gss_secpurge_ftype(CLIENT *clnt);
  157 typedef AUTH    *rpc_gss_seccreate_ftype(CLIENT *clnt, struct ucred *cred,
  158                     const char *clnt_principal, const char *principal,
  159                     const char *mechanism, rpc_gss_service_t service,
  160                     const char *qop, rpc_gss_options_req_t *options_req,
  161                     rpc_gss_options_ret_t *options_ret);
  162 typedef bool_t  rpc_gss_set_defaults_ftype(AUTH *auth,
  163                     rpc_gss_service_t service, const char *qop);
  164 typedef int     rpc_gss_max_data_length_ftype(AUTH *handle,
  165                     int max_tp_unit_len);
  166 typedef void    rpc_gss_get_error_ftype(rpc_gss_error_t *error);
  167 typedef bool_t  rpc_gss_mech_to_oid_ftype(const char *mech, gss_OID *oid_ret);
  168 typedef bool_t  rpc_gss_oid_to_mech_ftype(gss_OID oid, const char **mech_ret);
  169 typedef bool_t  rpc_gss_qop_to_num_ftype(const char *qop, const char *mech,
  170                     u_int *num_ret);
  171 typedef const char **rpc_gss_get_mechanisms_ftype(void);
  172 typedef bool_t  rpc_gss_get_versions_ftype(u_int *vers_hi, u_int *vers_lo);
  173 typedef bool_t  rpc_gss_is_installed_ftype(const char *mech);
  174 typedef bool_t  rpc_gss_set_svc_name_ftype(const char *principal,
  175                     const char *mechanism, u_int req_time, u_int program,
  176                     u_int version);
  177 typedef void    rpc_gss_clear_svc_name_ftype(u_int program, u_int version);
  178 typedef bool_t  rpc_gss_getcred_ftype(struct svc_req *req,
  179                     rpc_gss_rawcred_t **rcred,
  180                     rpc_gss_ucred_t **ucred, void **cookie);
  181 typedef bool_t  rpc_gss_set_callback_ftype(rpc_gss_callback_t *cb);
  182 typedef void    rpc_gss_clear_callback_ftype(rpc_gss_callback_t *cb);
  183 typedef bool_t  rpc_gss_get_principal_name_ftype(rpc_gss_principal_t *principal,
  184                     const char *mech, const char *name, const char *node,
  185                     const char *domain);
  186 typedef int     rpc_gss_svc_max_data_length_ftype(struct svc_req *req,
  187                     int max_tp_unit_len);
  188 typedef void    rpc_gss_refresh_auth_ftype(AUTH *auth);
  189 
  190 struct rpc_gss_entries {
  191         rpc_gss_secfind_ftype           *rpc_gss_secfind;
  192         rpc_gss_secpurge_ftype          *rpc_gss_secpurge;
  193         rpc_gss_seccreate_ftype         *rpc_gss_seccreate;
  194         rpc_gss_set_defaults_ftype      *rpc_gss_set_defaults;
  195         rpc_gss_max_data_length_ftype   *rpc_gss_max_data_length;
  196         rpc_gss_get_error_ftype         *rpc_gss_get_error;
  197         rpc_gss_mech_to_oid_ftype       *rpc_gss_mech_to_oid;
  198         rpc_gss_oid_to_mech_ftype       *rpc_gss_oid_to_mech;
  199         rpc_gss_qop_to_num_ftype        *rpc_gss_qop_to_num;
  200         rpc_gss_get_mechanisms_ftype    *rpc_gss_get_mechanisms;
  201         rpc_gss_get_versions_ftype      *rpc_gss_get_versions;
  202         rpc_gss_is_installed_ftype      *rpc_gss_is_installed;
  203         rpc_gss_set_svc_name_ftype      *rpc_gss_set_svc_name;
  204         rpc_gss_clear_svc_name_ftype    *rpc_gss_clear_svc_name;
  205         rpc_gss_getcred_ftype           *rpc_gss_getcred;
  206         rpc_gss_set_callback_ftype      *rpc_gss_set_callback;
  207         rpc_gss_clear_callback_ftype    *rpc_gss_clear_callback;
  208         rpc_gss_get_principal_name_ftype *rpc_gss_get_principal_name;
  209         rpc_gss_svc_max_data_length_ftype *rpc_gss_svc_max_data_length;
  210         rpc_gss_refresh_auth_ftype      *rpc_gss_refresh_auth;
  211 };
  212 extern struct rpc_gss_entries   rpc_gss_entries;
  213 
  214 /* Functions to access the entry points. */
  215 static __inline AUTH *
  216 rpc_gss_secfind_call(CLIENT *clnt, struct ucred *cred, const char *principal,
  217     gss_OID mech_oid, rpc_gss_service_t service)
  218 {
  219         AUTH *ret = NULL;
  220 
  221         if (rpc_gss_entries.rpc_gss_secfind != NULL)
  222                 ret = (*rpc_gss_entries.rpc_gss_secfind)(clnt, cred, principal,
  223                     mech_oid, service);
  224         return (ret);
  225 }
  226 
  227 static __inline void
  228 rpc_gss_secpurge_call(CLIENT *clnt)
  229 {
  230 
  231         if (rpc_gss_entries.rpc_gss_secpurge != NULL)
  232                 (*rpc_gss_entries.rpc_gss_secpurge)(clnt);
  233 }
  234 
  235 static __inline AUTH *
  236 rpc_gss_seccreate_call(CLIENT *clnt, struct ucred *cred,
  237     const char *clnt_principal, const char *principal, const char *mechanism,
  238     rpc_gss_service_t service, const char *qop,
  239     rpc_gss_options_req_t *options_req, rpc_gss_options_ret_t *options_ret)
  240 {
  241         AUTH *ret = NULL;
  242 
  243         if (rpc_gss_entries.rpc_gss_seccreate != NULL)
  244                 ret = (*rpc_gss_entries.rpc_gss_seccreate)(clnt, cred,
  245                     clnt_principal, principal, mechanism, service, qop,
  246                     options_req, options_ret);
  247         return (ret);
  248 }
  249 
  250 static __inline bool_t
  251 rpc_gss_set_defaults_call(AUTH *auth, rpc_gss_service_t service,
  252     const char *qop)
  253 {
  254         bool_t ret = 1;
  255 
  256         if (rpc_gss_entries.rpc_gss_set_defaults != NULL)
  257                 ret = (*rpc_gss_entries.rpc_gss_set_defaults)(auth, service,
  258                     qop);
  259         return (ret);
  260 }
  261 
  262 static __inline int
  263 rpc_gss_max_data_length_call(AUTH *handle, int max_tp_unit_len)
  264 {
  265         int ret = 0;
  266 
  267         if (rpc_gss_entries.rpc_gss_max_data_length != NULL)
  268                 ret = (*rpc_gss_entries.rpc_gss_max_data_length)(handle,
  269                     max_tp_unit_len);
  270         return (ret);
  271 }
  272 
  273 static __inline void
  274 rpc_gss_get_error_call(rpc_gss_error_t *error)
  275 {
  276 
  277         if (rpc_gss_entries.rpc_gss_get_error != NULL)
  278                 (*rpc_gss_entries.rpc_gss_get_error)(error);
  279 }
  280 
  281 static __inline bool_t
  282 rpc_gss_mech_to_oid_call(const char *mech, gss_OID *oid_ret)
  283 {
  284         bool_t ret = 1;
  285 
  286         if (rpc_gss_entries.rpc_gss_mech_to_oid != NULL)
  287                 ret = (*rpc_gss_entries.rpc_gss_mech_to_oid)(mech, oid_ret);
  288         return (ret);
  289 }
  290 
  291 static __inline bool_t
  292 rpc_gss_oid_to_mech_call(gss_OID oid, const char **mech_ret)
  293 {
  294         bool_t ret = 1;
  295 
  296         if (rpc_gss_entries.rpc_gss_oid_to_mech != NULL)
  297                 ret = (*rpc_gss_entries.rpc_gss_oid_to_mech)(oid, mech_ret);
  298         return (ret);
  299 }
  300 
  301 static __inline bool_t
  302 rpc_gss_qop_to_num_call(const char *qop, const char *mech, u_int *num_ret)
  303 {
  304         bool_t ret = 1;
  305 
  306         if (rpc_gss_entries.rpc_gss_qop_to_num != NULL)
  307                 ret = (*rpc_gss_entries.rpc_gss_qop_to_num)(qop, mech, num_ret);
  308         return (ret);
  309 }
  310 
  311 static __inline const char **
  312 rpc_gss_get_mechanisms_call(void)
  313 {
  314         const char **ret = NULL;
  315 
  316         if (rpc_gss_entries.rpc_gss_get_mechanisms != NULL)
  317                 ret = (*rpc_gss_entries.rpc_gss_get_mechanisms)();
  318         return (ret);
  319 }
  320 
  321 static __inline bool_t
  322 rpc_gss_get_versions_call(u_int *vers_hi, u_int *vers_lo)
  323 {
  324         bool_t ret = 1;
  325 
  326         if (rpc_gss_entries.rpc_gss_get_versions != NULL)
  327                 ret = (*rpc_gss_entries.rpc_gss_get_versions)(vers_hi, vers_lo);
  328         return (ret);
  329 }
  330 
  331 static __inline bool_t
  332 rpc_gss_is_installed_call(const char *mech)
  333 {
  334         bool_t ret = 1;
  335 
  336         if (rpc_gss_entries.rpc_gss_is_installed != NULL)
  337                 ret = (*rpc_gss_entries.rpc_gss_is_installed)(mech);
  338         return (ret);
  339 }
  340 
  341 static __inline bool_t
  342 rpc_gss_set_svc_name_call(const char *principal, const char *mechanism,
  343     u_int req_time, u_int program, u_int version)
  344 {
  345         bool_t ret = 1;
  346 
  347         if (rpc_gss_entries.rpc_gss_set_svc_name != NULL)
  348                 ret = (*rpc_gss_entries.rpc_gss_set_svc_name)(principal,
  349                     mechanism, req_time, program, version);
  350         return (ret);
  351 }
  352 
  353 static __inline void
  354 rpc_gss_clear_svc_name_call(u_int program, u_int version)
  355 {
  356 
  357         if (rpc_gss_entries.rpc_gss_clear_svc_name != NULL)
  358                 (*rpc_gss_entries.rpc_gss_clear_svc_name)(program, version);
  359 }
  360 
  361 static __inline bool_t
  362 rpc_gss_getcred_call(struct svc_req *req, rpc_gss_rawcred_t **rcred,
  363     rpc_gss_ucred_t **ucred, void **cookie)
  364 {
  365         bool_t ret = 1;
  366 
  367         if (rpc_gss_entries.rpc_gss_getcred != NULL)
  368                 ret = (*rpc_gss_entries.rpc_gss_getcred)(req, rcred, ucred,
  369                     cookie);
  370         return (ret);
  371 }
  372 
  373 static __inline bool_t
  374 rpc_gss_set_callback_call(rpc_gss_callback_t *cb)
  375 {
  376         bool_t ret = 1;
  377 
  378         if (rpc_gss_entries.rpc_gss_set_callback != NULL)
  379                 ret = (*rpc_gss_entries.rpc_gss_set_callback)(cb);
  380         return (ret);
  381 }
  382 
  383 static __inline void
  384 rpc_gss_clear_callback_call(rpc_gss_callback_t *cb)
  385 {
  386 
  387         if (rpc_gss_entries.rpc_gss_clear_callback != NULL)
  388                 (*rpc_gss_entries.rpc_gss_clear_callback)(cb);
  389 }
  390 
  391 static __inline bool_t
  392 rpc_gss_get_principal_name_call(rpc_gss_principal_t *principal,
  393     const char *mech, const char *name, const char *node, const char *domain)
  394 {
  395         bool_t ret = 1;
  396 
  397         if (rpc_gss_entries.rpc_gss_get_principal_name != NULL)
  398                 ret = (*rpc_gss_entries.rpc_gss_get_principal_name)(principal,
  399                     mech, name, node, domain);
  400         return (ret);
  401 }
  402 
  403 static __inline int
  404 rpc_gss_svc_max_data_length_call(struct svc_req *req, int max_tp_unit_len)
  405 {
  406         int ret = 0;
  407 
  408         if (rpc_gss_entries.rpc_gss_svc_max_data_length != NULL)
  409                 ret = (*rpc_gss_entries.rpc_gss_svc_max_data_length)(req,
  410                     max_tp_unit_len);
  411         return (ret);
  412 }
  413 
  414 static __inline void
  415 rpc_gss_refresh_auth_call(AUTH *auth)
  416 {
  417 
  418         if (rpc_gss_entries.rpc_gss_refresh_auth != NULL)
  419                 (*rpc_gss_entries.rpc_gss_refresh_auth)(auth);
  420 }
  421 
  422 AUTH    *rpc_gss_secfind(CLIENT *clnt, struct ucred *cred,
  423     const char *principal, gss_OID mech_oid, rpc_gss_service_t service);
  424 void    rpc_gss_secpurge(CLIENT *clnt);
  425 void    rpc_gss_refresh_auth(AUTH *auth);
  426 AUTH    *rpc_gss_seccreate(CLIENT *clnt, struct ucred *cred,
  427     const char *clnt_principal, const char *principal,
  428     const char *mechanism, rpc_gss_service_t service,
  429     const char *qop, rpc_gss_options_req_t *options_req,
  430     rpc_gss_options_ret_t *options_ret);
  431 #else   /* !_KERNEL */
  432 AUTH    *rpc_gss_seccreate(CLIENT *clnt, struct ucred *cred,
  433     const char *principal, const char *mechanism, rpc_gss_service_t service,
  434     const char *qop, rpc_gss_options_req_t *options_req,
  435     rpc_gss_options_ret_t *options_ret);
  436 #endif  /* _KERNEL */
  437 bool_t  rpc_gss_set_defaults(AUTH *auth, rpc_gss_service_t service,
  438     const char *qop);
  439 int     rpc_gss_max_data_length(AUTH *handle, int max_tp_unit_len);
  440 void    rpc_gss_get_error(rpc_gss_error_t *error);
  441 
  442 bool_t  rpc_gss_mech_to_oid(const char *mech, gss_OID *oid_ret);
  443 bool_t  rpc_gss_oid_to_mech(gss_OID oid, const char **mech_ret);
  444 bool_t  rpc_gss_qop_to_num(const char *qop, const char *mech, u_int *num_ret);
  445 const char **rpc_gss_get_mechanisms(void);
  446 const char **rpc_gss_get_mech_info(const char *mech, rpc_gss_service_t *service);
  447 bool_t  rpc_gss_get_versions(u_int *vers_hi, u_int *vers_lo);
  448 bool_t  rpc_gss_is_installed(const char *mech);
  449 
  450 bool_t  rpc_gss_set_svc_name(const char *principal, const char *mechanism,
  451     u_int req_time, u_int program, u_int version);
  452 void rpc_gss_clear_svc_name(u_int program, u_int version);
  453 bool_t  rpc_gss_getcred(struct svc_req *req, rpc_gss_rawcred_t **rcred,
  454     rpc_gss_ucred_t **ucred, void **cookie);
  455 bool_t  rpc_gss_set_callback(rpc_gss_callback_t *cb);
  456 void rpc_gss_clear_callback(rpc_gss_callback_t *cb);
  457 bool_t  rpc_gss_get_principal_name(rpc_gss_principal_t *principal,
  458     const char *mech, const char *name, const char *node, const char *domain);
  459 int     rpc_gss_svc_max_data_length(struct svc_req *req, int max_tp_unit_len);
  460 
  461 /*
  462  * Internal interface from the RPC implementation.
  463  */
  464 #ifndef _KERNEL
  465 bool_t  __rpc_gss_wrap(AUTH *auth, void *header, size_t headerlen,
  466     XDR* xdrs, xdrproc_t xdr_args, void *args_ptr);
  467 bool_t  __rpc_gss_unwrap(AUTH *auth, XDR* xdrs, xdrproc_t xdr_args,
  468     void *args_ptr);
  469 #endif
  470 bool_t __rpc_gss_set_error(int rpc_gss_error, int system_error);
  471 
  472 __END_DECLS
  473 
  474 #endif /* !_RPCSEC_GSS_H */

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