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  * Copyright (c) 2008 Doug Rabson
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  *      $FreeBSD: releng/11.2/sys/rpc/rpcsec_gss.h 253049 2013-07-09 01:05:28Z rmacklem $
   27  */
   28 
   29 #ifndef _RPCSEC_GSS_H
   30 #define _RPCSEC_GSS_H
   31 
   32 #include <kgssapi/gssapi.h>
   33 
   34 #ifndef MAX_GSS_MECH
   35 #define MAX_GSS_MECH    64
   36 #endif
   37 
   38 /*
   39  * Define the types of security service required for rpc_gss_seccreate().
   40  */
   41 typedef enum {
   42         rpc_gss_svc_default     = 0,
   43         rpc_gss_svc_none        = 1,
   44         rpc_gss_svc_integrity   = 2,
   45         rpc_gss_svc_privacy     = 3
   46 } rpc_gss_service_t;
   47 
   48 /*
   49  * Structure containing options for rpc_gss_seccreate().
   50  */
   51 typedef struct {
   52         int             req_flags;      /* GSS request bits */
   53         int             time_req;       /* requested credential lifetime */
   54         gss_cred_id_t   my_cred;        /* GSS credential */
   55         gss_channel_bindings_t input_channel_bindings;
   56 } rpc_gss_options_req_t;
   57 
   58 /*
   59  * Structure containing options returned by rpc_gss_seccreate().
   60  */
   61 typedef struct {
   62         int             major_status;
   63         int             minor_status;
   64         u_int           rpcsec_version;
   65         int             ret_flags;
   66         int             time_req;
   67         gss_ctx_id_t    gss_context;
   68         char            actual_mechanism[MAX_GSS_MECH];
   69 } rpc_gss_options_ret_t;
   70 
   71 /*
   72  * Client principal type. Used as an argument to
   73  * rpc_gss_get_principal_name(). Also referenced by the
   74  * rpc_gss_rawcred_t structure.
   75  */
   76 typedef struct {
   77         int             len;
   78         char            name[1];
   79 } *rpc_gss_principal_t;
   80 
   81 /*
   82  * Structure for raw credentials used by rpc_gss_getcred() and
   83  * rpc_gss_set_callback().
   84  */
   85 typedef struct {
   86         u_int           version;        /* RPC version number */
   87         const char      *mechanism;     /* security mechanism */
   88         const char      *qop;           /* quality of protection */
   89         rpc_gss_principal_t client_principal; /* client name */
   90         const char      *svc_principal; /* server name */
   91         rpc_gss_service_t service;      /* service type */
   92 } rpc_gss_rawcred_t;
   93 
   94 /*
   95  * Unix credentials derived from raw credentials. Returned by
   96  * rpc_gss_getcred().
   97  */
   98 typedef struct {
   99         uid_t           uid;            /* user ID */
  100         gid_t           gid;            /* group ID */
  101         short           gidlen;
  102         gid_t           *gidlist;       /* list of groups */
  103 } rpc_gss_ucred_t;
  104 
  105 /*
  106  * Structure used to enforce a particular QOP and service.
  107  */
  108 typedef struct {
  109         bool_t          locked;
  110         rpc_gss_rawcred_t *raw_cred;
  111 } rpc_gss_lock_t;
  112 
  113 /*
  114  * Callback structure used by rpc_gss_set_callback().
  115  */
  116 typedef struct {
  117         u_int           program;        /* RPC program number */
  118         u_int           version;        /* RPC version number */
  119                                         /* user defined callback */
  120         bool_t          (*callback)(struct svc_req *req,
  121                                     gss_cred_id_t deleg,
  122                                     gss_ctx_id_t gss_context,
  123                                     rpc_gss_lock_t *lock,
  124                                     void **cookie);
  125 } rpc_gss_callback_t;
  126 
  127 /*
  128  * Structure used to return error information by rpc_gss_get_error()
  129  */
  130 typedef struct {
  131         int             rpc_gss_error;
  132         int             system_error;   /* same as errno */
  133 } rpc_gss_error_t;
  134 
  135 /*
  136  * Values for rpc_gss_error
  137  */
  138 #define RPC_GSS_ER_SUCCESS      0       /* no error */
  139 #define RPC_GSS_ER_SYSTEMERROR  1       /* system error */
  140 
  141 __BEGIN_DECLS
  142 
  143 #ifdef _KERNEL
  144 /*
  145  * Set up a structure of entry points for the kgssapi module and inline
  146  * functions named rpc_gss_XXX_call() to use them, so that the kgssapi
  147  * module doesn't need to be loaded for the NFS modules to work using
  148  * AUTH_SYS. The kgssapi modules will be loaded by the gssd(8) daemon
  149  * when it is started up and the entry points will then be filled in.
  150  */
  151 typedef AUTH    *rpc_gss_secfind_ftype(CLIENT *clnt, struct ucred *cred,
  152                     const char *principal, gss_OID mech_oid,
  153                     rpc_gss_service_t service);
  154 typedef void    rpc_gss_secpurge_ftype(CLIENT *clnt);
  155 typedef AUTH    *rpc_gss_seccreate_ftype(CLIENT *clnt, struct ucred *cred,
  156                     const char *clnt_principal, const char *principal,
  157                     const char *mechanism, rpc_gss_service_t service,
  158                     const char *qop, rpc_gss_options_req_t *options_req,
  159                     rpc_gss_options_ret_t *options_ret);
  160 typedef bool_t  rpc_gss_set_defaults_ftype(AUTH *auth,
  161                     rpc_gss_service_t service, const char *qop);
  162 typedef int     rpc_gss_max_data_length_ftype(AUTH *handle,
  163                     int max_tp_unit_len);
  164 typedef void    rpc_gss_get_error_ftype(rpc_gss_error_t *error);
  165 typedef bool_t  rpc_gss_mech_to_oid_ftype(const char *mech, gss_OID *oid_ret);
  166 typedef bool_t  rpc_gss_oid_to_mech_ftype(gss_OID oid, const char **mech_ret);
  167 typedef bool_t  rpc_gss_qop_to_num_ftype(const char *qop, const char *mech,
  168                     u_int *num_ret);
  169 typedef const char **rpc_gss_get_mechanisms_ftype(void);
  170 typedef bool_t  rpc_gss_get_versions_ftype(u_int *vers_hi, u_int *vers_lo);
  171 typedef bool_t  rpc_gss_is_installed_ftype(const char *mech);
  172 typedef bool_t  rpc_gss_set_svc_name_ftype(const char *principal,
  173                     const char *mechanism, u_int req_time, u_int program,
  174                     u_int version);
  175 typedef void    rpc_gss_clear_svc_name_ftype(u_int program, u_int version);
  176 typedef bool_t  rpc_gss_getcred_ftype(struct svc_req *req,
  177                     rpc_gss_rawcred_t **rcred,
  178                     rpc_gss_ucred_t **ucred, void **cookie);
  179 typedef bool_t  rpc_gss_set_callback_ftype(rpc_gss_callback_t *cb);
  180 typedef void    rpc_gss_clear_callback_ftype(rpc_gss_callback_t *cb);
  181 typedef bool_t  rpc_gss_get_principal_name_ftype(rpc_gss_principal_t *principal,
  182                     const char *mech, const char *name, const char *node,
  183                     const char *domain);
  184 typedef int     rpc_gss_svc_max_data_length_ftype(struct svc_req *req,
  185                     int max_tp_unit_len);
  186 typedef void    rpc_gss_refresh_auth_ftype(AUTH *auth);
  187 
  188 struct rpc_gss_entries {
  189         rpc_gss_secfind_ftype           *rpc_gss_secfind;
  190         rpc_gss_secpurge_ftype          *rpc_gss_secpurge;
  191         rpc_gss_seccreate_ftype         *rpc_gss_seccreate;
  192         rpc_gss_set_defaults_ftype      *rpc_gss_set_defaults;
  193         rpc_gss_max_data_length_ftype   *rpc_gss_max_data_length;
  194         rpc_gss_get_error_ftype         *rpc_gss_get_error;
  195         rpc_gss_mech_to_oid_ftype       *rpc_gss_mech_to_oid;
  196         rpc_gss_oid_to_mech_ftype       *rpc_gss_oid_to_mech;
  197         rpc_gss_qop_to_num_ftype        *rpc_gss_qop_to_num;
  198         rpc_gss_get_mechanisms_ftype    *rpc_gss_get_mechanisms;
  199         rpc_gss_get_versions_ftype      *rpc_gss_get_versions;
  200         rpc_gss_is_installed_ftype      *rpc_gss_is_installed;
  201         rpc_gss_set_svc_name_ftype      *rpc_gss_set_svc_name;
  202         rpc_gss_clear_svc_name_ftype    *rpc_gss_clear_svc_name;
  203         rpc_gss_getcred_ftype           *rpc_gss_getcred;
  204         rpc_gss_set_callback_ftype      *rpc_gss_set_callback;
  205         rpc_gss_clear_callback_ftype    *rpc_gss_clear_callback;
  206         rpc_gss_get_principal_name_ftype *rpc_gss_get_principal_name;
  207         rpc_gss_svc_max_data_length_ftype *rpc_gss_svc_max_data_length;
  208         rpc_gss_refresh_auth_ftype      *rpc_gss_refresh_auth;
  209 };
  210 extern struct rpc_gss_entries   rpc_gss_entries;
  211 
  212 /* Functions to access the entry points. */
  213 static __inline AUTH *
  214 rpc_gss_secfind_call(CLIENT *clnt, struct ucred *cred, const char *principal,
  215     gss_OID mech_oid, rpc_gss_service_t service)
  216 {
  217         AUTH *ret = NULL;
  218 
  219         if (rpc_gss_entries.rpc_gss_secfind != NULL)
  220                 ret = (*rpc_gss_entries.rpc_gss_secfind)(clnt, cred, principal,
  221                     mech_oid, service);
  222         return (ret);
  223 }
  224 
  225 static __inline void
  226 rpc_gss_secpurge_call(CLIENT *clnt)
  227 {
  228 
  229         if (rpc_gss_entries.rpc_gss_secpurge != NULL)
  230                 (*rpc_gss_entries.rpc_gss_secpurge)(clnt);
  231 }
  232 
  233 static __inline AUTH *
  234 rpc_gss_seccreate_call(CLIENT *clnt, struct ucred *cred,
  235     const char *clnt_principal, const char *principal, const char *mechanism,
  236     rpc_gss_service_t service, const char *qop,
  237     rpc_gss_options_req_t *options_req, rpc_gss_options_ret_t *options_ret)
  238 {
  239         AUTH *ret = NULL;
  240 
  241         if (rpc_gss_entries.rpc_gss_seccreate != NULL)
  242                 ret = (*rpc_gss_entries.rpc_gss_seccreate)(clnt, cred,
  243                     clnt_principal, principal, mechanism, service, qop,
  244                     options_req, options_ret);
  245         return (ret);
  246 }
  247 
  248 static __inline bool_t
  249 rpc_gss_set_defaults_call(AUTH *auth, rpc_gss_service_t service,
  250     const char *qop)
  251 {
  252         bool_t ret = 1;
  253 
  254         if (rpc_gss_entries.rpc_gss_set_defaults != NULL)
  255                 ret = (*rpc_gss_entries.rpc_gss_set_defaults)(auth, service,
  256                     qop);
  257         return (ret);
  258 }
  259 
  260 static __inline int
  261 rpc_gss_max_data_length_call(AUTH *handle, int max_tp_unit_len)
  262 {
  263         int ret = 0;
  264 
  265         if (rpc_gss_entries.rpc_gss_max_data_length != NULL)
  266                 ret = (*rpc_gss_entries.rpc_gss_max_data_length)(handle,
  267                     max_tp_unit_len);
  268         return (ret);
  269 }
  270 
  271 static __inline void
  272 rpc_gss_get_error_call(rpc_gss_error_t *error)
  273 {
  274 
  275         if (rpc_gss_entries.rpc_gss_get_error != NULL)
  276                 (*rpc_gss_entries.rpc_gss_get_error)(error);
  277 }
  278 
  279 static __inline bool_t
  280 rpc_gss_mech_to_oid_call(const char *mech, gss_OID *oid_ret)
  281 {
  282         bool_t ret = 1;
  283 
  284         if (rpc_gss_entries.rpc_gss_mech_to_oid != NULL)
  285                 ret = (*rpc_gss_entries.rpc_gss_mech_to_oid)(mech, oid_ret);
  286         return (ret);
  287 }
  288 
  289 static __inline bool_t
  290 rpc_gss_oid_to_mech_call(gss_OID oid, const char **mech_ret)
  291 {
  292         bool_t ret = 1;
  293 
  294         if (rpc_gss_entries.rpc_gss_oid_to_mech != NULL)
  295                 ret = (*rpc_gss_entries.rpc_gss_oid_to_mech)(oid, mech_ret);
  296         return (ret);
  297 }
  298 
  299 static __inline bool_t
  300 rpc_gss_qop_to_num_call(const char *qop, const char *mech, u_int *num_ret)
  301 {
  302         bool_t ret = 1;
  303 
  304         if (rpc_gss_entries.rpc_gss_qop_to_num != NULL)
  305                 ret = (*rpc_gss_entries.rpc_gss_qop_to_num)(qop, mech, num_ret);
  306         return (ret);
  307 }
  308 
  309 static __inline const char **
  310 rpc_gss_get_mechanisms_call(void)
  311 {
  312         const char **ret = NULL;
  313 
  314         if (rpc_gss_entries.rpc_gss_get_mechanisms != NULL)
  315                 ret = (*rpc_gss_entries.rpc_gss_get_mechanisms)();
  316         return (ret);
  317 }
  318 
  319 static __inline bool_t
  320 rpc_gss_get_versions_call(u_int *vers_hi, u_int *vers_lo)
  321 {
  322         bool_t ret = 1;
  323 
  324         if (rpc_gss_entries.rpc_gss_get_versions != NULL)
  325                 ret = (*rpc_gss_entries.rpc_gss_get_versions)(vers_hi, vers_lo);
  326         return (ret);
  327 }
  328 
  329 static __inline bool_t
  330 rpc_gss_is_installed_call(const char *mech)
  331 {
  332         bool_t ret = 1;
  333 
  334         if (rpc_gss_entries.rpc_gss_is_installed != NULL)
  335                 ret = (*rpc_gss_entries.rpc_gss_is_installed)(mech);
  336         return (ret);
  337 }
  338 
  339 static __inline bool_t
  340 rpc_gss_set_svc_name_call(const char *principal, const char *mechanism,
  341     u_int req_time, u_int program, u_int version)
  342 {
  343         bool_t ret = 1;
  344 
  345         if (rpc_gss_entries.rpc_gss_set_svc_name != NULL)
  346                 ret = (*rpc_gss_entries.rpc_gss_set_svc_name)(principal,
  347                     mechanism, req_time, program, version);
  348         return (ret);
  349 }
  350 
  351 static __inline void
  352 rpc_gss_clear_svc_name_call(u_int program, u_int version)
  353 {
  354 
  355         if (rpc_gss_entries.rpc_gss_clear_svc_name != NULL)
  356                 (*rpc_gss_entries.rpc_gss_clear_svc_name)(program, version);
  357 }
  358 
  359 static __inline bool_t
  360 rpc_gss_getcred_call(struct svc_req *req, rpc_gss_rawcred_t **rcred,
  361     rpc_gss_ucred_t **ucred, void **cookie)
  362 {
  363         bool_t ret = 1;
  364 
  365         if (rpc_gss_entries.rpc_gss_getcred != NULL)
  366                 ret = (*rpc_gss_entries.rpc_gss_getcred)(req, rcred, ucred,
  367                     cookie);
  368         return (ret);
  369 }
  370 
  371 static __inline bool_t
  372 rpc_gss_set_callback_call(rpc_gss_callback_t *cb)
  373 {
  374         bool_t ret = 1;
  375 
  376         if (rpc_gss_entries.rpc_gss_set_callback != NULL)
  377                 ret = (*rpc_gss_entries.rpc_gss_set_callback)(cb);
  378         return (ret);
  379 }
  380 
  381 static __inline void
  382 rpc_gss_clear_callback_call(rpc_gss_callback_t *cb)
  383 {
  384 
  385         if (rpc_gss_entries.rpc_gss_clear_callback != NULL)
  386                 (*rpc_gss_entries.rpc_gss_clear_callback)(cb);
  387 }
  388 
  389 static __inline bool_t
  390 rpc_gss_get_principal_name_call(rpc_gss_principal_t *principal,
  391     const char *mech, const char *name, const char *node, const char *domain)
  392 {
  393         bool_t ret = 1;
  394 
  395         if (rpc_gss_entries.rpc_gss_get_principal_name != NULL)
  396                 ret = (*rpc_gss_entries.rpc_gss_get_principal_name)(principal,
  397                     mech, name, node, domain);
  398         return (ret);
  399 }
  400 
  401 static __inline int
  402 rpc_gss_svc_max_data_length_call(struct svc_req *req, int max_tp_unit_len)
  403 {
  404         int ret = 0;
  405 
  406         if (rpc_gss_entries.rpc_gss_svc_max_data_length != NULL)
  407                 ret = (*rpc_gss_entries.rpc_gss_svc_max_data_length)(req,
  408                     max_tp_unit_len);
  409         return (ret);
  410 }
  411 
  412 static __inline void
  413 rpc_gss_refresh_auth_call(AUTH *auth)
  414 {
  415 
  416         if (rpc_gss_entries.rpc_gss_refresh_auth != NULL)
  417                 (*rpc_gss_entries.rpc_gss_refresh_auth)(auth);
  418 }
  419 
  420 AUTH    *rpc_gss_secfind(CLIENT *clnt, struct ucred *cred,
  421     const char *principal, gss_OID mech_oid, rpc_gss_service_t service);
  422 void    rpc_gss_secpurge(CLIENT *clnt);
  423 void    rpc_gss_refresh_auth(AUTH *auth);
  424 AUTH    *rpc_gss_seccreate(CLIENT *clnt, struct ucred *cred,
  425     const char *clnt_principal, const char *principal,
  426     const char *mechanism, rpc_gss_service_t service,
  427     const char *qop, rpc_gss_options_req_t *options_req,
  428     rpc_gss_options_ret_t *options_ret);
  429 #else   /* !_KERNEL */
  430 AUTH    *rpc_gss_seccreate(CLIENT *clnt, struct ucred *cred,
  431     const char *principal, const char *mechanism, rpc_gss_service_t service,
  432     const char *qop, rpc_gss_options_req_t *options_req,
  433     rpc_gss_options_ret_t *options_ret);
  434 #endif  /* _KERNEL */
  435 bool_t  rpc_gss_set_defaults(AUTH *auth, rpc_gss_service_t service,
  436     const char *qop);
  437 int     rpc_gss_max_data_length(AUTH *handle, int max_tp_unit_len);
  438 void    rpc_gss_get_error(rpc_gss_error_t *error);
  439 
  440 bool_t  rpc_gss_mech_to_oid(const char *mech, gss_OID *oid_ret);
  441 bool_t  rpc_gss_oid_to_mech(gss_OID oid, const char **mech_ret);
  442 bool_t  rpc_gss_qop_to_num(const char *qop, const char *mech, u_int *num_ret);
  443 const char **rpc_gss_get_mechanisms(void);
  444 const char **rpc_gss_get_mech_info(const char *mech, rpc_gss_service_t *service);
  445 bool_t  rpc_gss_get_versions(u_int *vers_hi, u_int *vers_lo);
  446 bool_t  rpc_gss_is_installed(const char *mech);
  447 
  448 bool_t  rpc_gss_set_svc_name(const char *principal, const char *mechanism,
  449     u_int req_time, u_int program, u_int version);
  450 void rpc_gss_clear_svc_name(u_int program, u_int version);
  451 bool_t  rpc_gss_getcred(struct svc_req *req, rpc_gss_rawcred_t **rcred,
  452     rpc_gss_ucred_t **ucred, void **cookie);
  453 bool_t  rpc_gss_set_callback(rpc_gss_callback_t *cb);
  454 void rpc_gss_clear_callback(rpc_gss_callback_t *cb);
  455 bool_t  rpc_gss_get_principal_name(rpc_gss_principal_t *principal,
  456     const char *mech, const char *name, const char *node, const char *domain);
  457 int     rpc_gss_svc_max_data_length(struct svc_req *req, int max_tp_unit_len);
  458 
  459 /*
  460  * Internal interface from the RPC implementation.
  461  */
  462 #ifndef _KERNEL
  463 bool_t  __rpc_gss_wrap(AUTH *auth, void *header, size_t headerlen,
  464     XDR* xdrs, xdrproc_t xdr_args, void *args_ptr);
  465 bool_t  __rpc_gss_unwrap(AUTH *auth, XDR* xdrs, xdrproc_t xdr_args,
  466     void *args_ptr);
  467 #endif
  468 bool_t __rpc_gss_set_error(int rpc_gss_error, int system_error);
  469 
  470 __END_DECLS
  471 
  472 #endif /* !_RPCSEC_GSS_H */

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