1/* 2 * linux/net/sunrpc/gss_mech_switch.c 3 * 4 * Copyright (c) 2001 The Regents of the University of Michigan. 5 * All rights reserved. 6 * 7 * J. Bruce Fields <bfields@umich.edu> 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 25 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 29 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 30 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 31 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 32 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 * 34 */ 35 36#include <linux/types.h> 37#include <linux/slab.h> 38#include <linux/module.h> 39#include <linux/sunrpc/msg_prot.h> 40#include <linux/sunrpc/gss_asn1.h> 41#include <linux/sunrpc/auth_gss.h> 42#include <linux/sunrpc/svcauth_gss.h> 43#include <linux/sunrpc/gss_err.h> 44#include <linux/sunrpc/sched.h> 45#include <linux/sunrpc/gss_api.h> 46#include <linux/sunrpc/clnt.h> 47 48#ifdef RPC_DEBUG 49# define RPCDBG_FACILITY RPCDBG_AUTH 50#endif 51 52static LIST_HEAD(registered_mechs); 53static DEFINE_SPINLOCK(registered_mechs_lock); 54 55static void 56gss_mech_free(struct gss_api_mech *gm) 57{ 58 struct pf_desc *pf; 59 int i; 60 61 for (i = 0; i < gm->gm_pf_num; i++) { 62 pf = &gm->gm_pfs[i]; 63 kfree(pf->auth_domain_name); 64 pf->auth_domain_name = NULL; 65 } 66} 67 68static inline char * 69make_auth_domain_name(char *name) 70{ 71 static char *prefix = "gss/"; 72 char *new; 73 74 new = kmalloc(strlen(name) + strlen(prefix) + 1, GFP_KERNEL); 75 if (new) { 76 strcpy(new, prefix); 77 strcat(new, name); 78 } 79 return new; 80} 81 82static int 83gss_mech_svc_setup(struct gss_api_mech *gm) 84{ 85 struct pf_desc *pf; 86 int i, status; 87 88 for (i = 0; i < gm->gm_pf_num; i++) { 89 pf = &gm->gm_pfs[i]; 90 pf->auth_domain_name = make_auth_domain_name(pf->name); 91 status = -ENOMEM; 92 if (pf->auth_domain_name == NULL) 93 goto out; 94 status = svcauth_gss_register_pseudoflavor(pf->pseudoflavor, 95 pf->auth_domain_name); 96 if (status) 97 goto out; 98 } 99 return 0; 100out: 101 gss_mech_free(gm); 102 return status; 103} 104 105int 106gss_mech_register(struct gss_api_mech *gm) 107{ 108 int status; 109 110 status = gss_mech_svc_setup(gm); 111 if (status) 112 return status; 113 spin_lock(®istered_mechs_lock); 114 list_add(&gm->gm_list, ®istered_mechs); 115 spin_unlock(®istered_mechs_lock); 116 dprintk("RPC: registered gss mechanism %s\n", gm->gm_name); 117 return 0; 118} 119 120EXPORT_SYMBOL_GPL(gss_mech_register); 121 122void 123gss_mech_unregister(struct gss_api_mech *gm) 124{ 125 spin_lock(®istered_mechs_lock); 126 list_del(&gm->gm_list); 127 spin_unlock(®istered_mechs_lock); 128 dprintk("RPC: unregistered gss mechanism %s\n", gm->gm_name); 129 gss_mech_free(gm); 130} 131 132EXPORT_SYMBOL_GPL(gss_mech_unregister); 133 134struct gss_api_mech * 135gss_mech_get(struct gss_api_mech *gm) 136{ 137 __module_get(gm->gm_owner); 138 return gm; 139} 140 141EXPORT_SYMBOL_GPL(gss_mech_get); 142 143struct gss_api_mech * 144gss_mech_get_by_name(const char *name) 145{ 146 struct gss_api_mech *pos, *gm = NULL; 147 148 spin_lock(®istered_mechs_lock); 149 list_for_each_entry(pos, ®istered_mechs, gm_list) { 150 if (0 == strcmp(name, pos->gm_name)) { 151 if (try_module_get(pos->gm_owner)) 152 gm = pos; 153 break; 154 } 155 } 156 spin_unlock(®istered_mechs_lock); 157 return gm; 158 159} 160 161EXPORT_SYMBOL_GPL(gss_mech_get_by_name); 162 163static inline int 164mech_supports_pseudoflavor(struct gss_api_mech *gm, u32 pseudoflavor) 165{ 166 int i; 167 168 for (i = 0; i < gm->gm_pf_num; i++) { 169 if (gm->gm_pfs[i].pseudoflavor == pseudoflavor) 170 return 1; 171 } 172 return 0; 173} 174 175struct gss_api_mech * 176gss_mech_get_by_pseudoflavor(u32 pseudoflavor) 177{ 178 struct gss_api_mech *pos, *gm = NULL; 179 180 spin_lock(®istered_mechs_lock); 181 list_for_each_entry(pos, ®istered_mechs, gm_list) { 182 if (!mech_supports_pseudoflavor(pos, pseudoflavor)) { 183 module_put(pos->gm_owner); 184 continue; 185 } 186 if (try_module_get(pos->gm_owner)) 187 gm = pos; 188 break; 189 } 190 spin_unlock(®istered_mechs_lock); 191 return gm; 192} 193 194EXPORT_SYMBOL_GPL(gss_mech_get_by_pseudoflavor); 195 196u32 197gss_svc_to_pseudoflavor(struct gss_api_mech *gm, u32 service) 198{ 199 int i; 200 201 for (i = 0; i < gm->gm_pf_num; i++) { 202 if (gm->gm_pfs[i].service == service) { 203 return gm->gm_pfs[i].pseudoflavor; 204 } 205 } 206 return RPC_AUTH_MAXFLAVOR; /* illegal value */ 207} 208EXPORT_SYMBOL_GPL(gss_svc_to_pseudoflavor); 209 210u32 211gss_pseudoflavor_to_service(struct gss_api_mech *gm, u32 pseudoflavor) 212{ 213 int i; 214 215 for (i = 0; i < gm->gm_pf_num; i++) { 216 if (gm->gm_pfs[i].pseudoflavor == pseudoflavor) 217 return gm->gm_pfs[i].service; 218 } 219 return 0; 220} 221 222EXPORT_SYMBOL_GPL(gss_pseudoflavor_to_service); 223 224char * 225gss_service_to_auth_domain_name(struct gss_api_mech *gm, u32 service) 226{ 227 int i; 228 229 for (i = 0; i < gm->gm_pf_num; i++) { 230 if (gm->gm_pfs[i].service == service) 231 return gm->gm_pfs[i].auth_domain_name; 232 } 233 return NULL; 234} 235 236EXPORT_SYMBOL_GPL(gss_service_to_auth_domain_name); 237 238void 239gss_mech_put(struct gss_api_mech * gm) 240{ 241 if (gm) 242 module_put(gm->gm_owner); 243} 244 245EXPORT_SYMBOL_GPL(gss_mech_put); 246 247/* The mech could probably be determined from the token instead, but it's just 248 * as easy for now to pass it in. */ 249int 250gss_import_sec_context(const void *input_token, size_t bufsize, 251 struct gss_api_mech *mech, 252 struct gss_ctx **ctx_id, 253 gfp_t gfp_mask) 254{ 255 if (!(*ctx_id = kzalloc(sizeof(**ctx_id), gfp_mask))) 256 return -ENOMEM; 257 (*ctx_id)->mech_type = gss_mech_get(mech); 258 259 return mech->gm_ops 260 ->gss_import_sec_context(input_token, bufsize, *ctx_id, gfp_mask); 261} 262 263/* gss_get_mic: compute a mic over message and return mic_token. */ 264 265u32 266gss_get_mic(struct gss_ctx *context_handle, 267 struct xdr_buf *message, 268 struct xdr_netobj *mic_token) 269{ 270 return context_handle->mech_type->gm_ops 271 ->gss_get_mic(context_handle, 272 message, 273 mic_token); 274} 275 276/* gss_verify_mic: check whether the provided mic_token verifies message. */ 277 278u32 279gss_verify_mic(struct gss_ctx *context_handle, 280 struct xdr_buf *message, 281 struct xdr_netobj *mic_token) 282{ 283 return context_handle->mech_type->gm_ops 284 ->gss_verify_mic(context_handle, 285 message, 286 mic_token); 287} 288 289/* 290 * This function is called from both the client and server code. 291 * Each makes guarantees about how much "slack" space is available 292 * for the underlying function in "buf"'s head and tail while 293 * performing the wrap. 294 * 295 * The client and server code allocate RPC_MAX_AUTH_SIZE extra 296 * space in both the head and tail which is available for use by 297 * the wrap function. 298 * 299 * Underlying functions should verify they do not use more than 300 * RPC_MAX_AUTH_SIZE of extra space in either the head or tail 301 * when performing the wrap. 302 */ 303u32 304gss_wrap(struct gss_ctx *ctx_id, 305 int offset, 306 struct xdr_buf *buf, 307 struct page **inpages) 308{ 309 return ctx_id->mech_type->gm_ops 310 ->gss_wrap(ctx_id, offset, buf, inpages); 311} 312 313u32 314gss_unwrap(struct gss_ctx *ctx_id, 315 int offset, 316 struct xdr_buf *buf) 317{ 318 return ctx_id->mech_type->gm_ops 319 ->gss_unwrap(ctx_id, offset, buf); 320} 321 322 323/* gss_delete_sec_context: free all resources associated with context_handle. 324 * Note this differs from the RFC 2744-specified prototype in that we don't 325 * bother returning an output token, since it would never be used anyway. */ 326 327u32 328gss_delete_sec_context(struct gss_ctx **context_handle) 329{ 330 dprintk("RPC: gss_delete_sec_context deleting %p\n", 331 *context_handle); 332 333 if (!*context_handle) 334 return(GSS_S_NO_CONTEXT); 335 if ((*context_handle)->internal_ctx_id) 336 (*context_handle)->mech_type->gm_ops 337 ->gss_delete_sec_context((*context_handle) 338 ->internal_ctx_id); 339 gss_mech_put((*context_handle)->mech_type); 340 kfree(*context_handle); 341 *context_handle=NULL; 342 return GSS_S_COMPLETE; 343} 344