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 52 static LIST_HEAD(registered_mechs); 53 static DEFINE_SPINLOCK(registered_mechs_lock); 54 55 static void 56 gss_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 if (pf->auth_domain_name) 64 kfree(pf->auth_domain_name); 65 pf->auth_domain_name = NULL; 66 } 67 } 68 69 static inline char * 70 make_auth_domain_name(char *name) 71 { 72 static char *prefix = "gss/"; 73 char *new; 74 75 new = kmalloc(strlen(name) + strlen(prefix) + 1, GFP_KERNEL); 76 if (new) { 77 strcpy(new, prefix); 78 strcat(new, name); 79 } 80 return new; 81 } 82 83 static int 84 gss_mech_svc_setup(struct gss_api_mech *gm) 85 { 86 struct pf_desc *pf; 87 int i, status; 88 89 for (i = 0; i < gm->gm_pf_num; i++) { 90 pf = &gm->gm_pfs[i]; 91 pf->auth_domain_name = make_auth_domain_name(pf->name); 92 status = -ENOMEM; 93 if (pf->auth_domain_name == NULL) 94 goto out; 95 status = svcauth_gss_register_pseudoflavor(pf->pseudoflavor, 96 pf->auth_domain_name); 97 if (status) 98 goto out; 99 } 100 return 0; 101 out: 102 gss_mech_free(gm); 103 return status; 104 } 105 106 int 107 gss_mech_register(struct gss_api_mech *gm) 108 { 109 int status; 110 111 status = gss_mech_svc_setup(gm); 112 if (status) 113 return status; 114 spin_lock(®istered_mechs_lock); 115 list_add(&gm->gm_list, ®istered_mechs); 116 spin_unlock(®istered_mechs_lock); 117 dprintk("RPC: registered gss mechanism %s\n", gm->gm_name); 118 return 0; 119 } 120 121 EXPORT_SYMBOL(gss_mech_register); 122 123 void 124 gss_mech_unregister(struct gss_api_mech *gm) 125 { 126 spin_lock(®istered_mechs_lock); 127 list_del(&gm->gm_list); 128 spin_unlock(®istered_mechs_lock); 129 dprintk("RPC: unregistered gss mechanism %s\n", gm->gm_name); 130 gss_mech_free(gm); 131 } 132 133 EXPORT_SYMBOL(gss_mech_unregister); 134 135 struct gss_api_mech * 136 gss_mech_get(struct gss_api_mech *gm) 137 { 138 __module_get(gm->gm_owner); 139 return gm; 140 } 141 142 EXPORT_SYMBOL(gss_mech_get); 143 144 struct gss_api_mech * 145 gss_mech_get_by_name(const char *name) 146 { 147 struct gss_api_mech *pos, *gm = NULL; 148 149 spin_lock(®istered_mechs_lock); 150 list_for_each_entry(pos, ®istered_mechs, gm_list) { 151 if (0 == strcmp(name, pos->gm_name)) { 152 if (try_module_get(pos->gm_owner)) 153 gm = pos; 154 break; 155 } 156 } 157 spin_unlock(®istered_mechs_lock); 158 return gm; 159 160 } 161 162 EXPORT_SYMBOL(gss_mech_get_by_name); 163 164 static inline int 165 mech_supports_pseudoflavor(struct gss_api_mech *gm, u32 pseudoflavor) 166 { 167 int i; 168 169 for (i = 0; i < gm->gm_pf_num; i++) { 170 if (gm->gm_pfs[i].pseudoflavor == pseudoflavor) 171 return 1; 172 } 173 return 0; 174 } 175 176 struct gss_api_mech * 177 gss_mech_get_by_pseudoflavor(u32 pseudoflavor) 178 { 179 struct gss_api_mech *pos, *gm = NULL; 180 181 spin_lock(®istered_mechs_lock); 182 list_for_each_entry(pos, ®istered_mechs, gm_list) { 183 if (!mech_supports_pseudoflavor(pos, pseudoflavor)) { 184 module_put(pos->gm_owner); 185 continue; 186 } 187 if (try_module_get(pos->gm_owner)) 188 gm = pos; 189 break; 190 } 191 spin_unlock(®istered_mechs_lock); 192 return gm; 193 } 194 195 EXPORT_SYMBOL(gss_mech_get_by_pseudoflavor); 196 197 u32 198 gss_pseudoflavor_to_service(struct gss_api_mech *gm, u32 pseudoflavor) 199 { 200 int i; 201 202 for (i = 0; i < gm->gm_pf_num; i++) { 203 if (gm->gm_pfs[i].pseudoflavor == pseudoflavor) 204 return gm->gm_pfs[i].service; 205 } 206 return 0; 207 } 208 209 EXPORT_SYMBOL(gss_pseudoflavor_to_service); 210 211 char * 212 gss_service_to_auth_domain_name(struct gss_api_mech *gm, u32 service) 213 { 214 int i; 215 216 for (i = 0; i < gm->gm_pf_num; i++) { 217 if (gm->gm_pfs[i].service == service) 218 return gm->gm_pfs[i].auth_domain_name; 219 } 220 return NULL; 221 } 222 223 EXPORT_SYMBOL(gss_service_to_auth_domain_name); 224 225 void 226 gss_mech_put(struct gss_api_mech * gm) 227 { 228 module_put(gm->gm_owner); 229 } 230 231 EXPORT_SYMBOL(gss_mech_put); 232 233 /* The mech could probably be determined from the token instead, but it's just 234 * as easy for now to pass it in. */ 235 int 236 gss_import_sec_context(const void *input_token, size_t bufsize, 237 struct gss_api_mech *mech, 238 struct gss_ctx **ctx_id) 239 { 240 if (!(*ctx_id = kmalloc(sizeof(**ctx_id), GFP_KERNEL))) 241 return GSS_S_FAILURE; 242 memset(*ctx_id, 0, sizeof(**ctx_id)); 243 (*ctx_id)->mech_type = gss_mech_get(mech); 244 245 return mech->gm_ops 246 ->gss_import_sec_context(input_token, bufsize, *ctx_id); 247 } 248 249 /* gss_get_mic: compute a mic over message and return mic_token. */ 250 251 u32 252 gss_get_mic(struct gss_ctx *context_handle, 253 struct xdr_buf *message, 254 struct xdr_netobj *mic_token) 255 { 256 return context_handle->mech_type->gm_ops 257 ->gss_get_mic(context_handle, 258 message, 259 mic_token); 260 } 261 262 /* gss_verify_mic: check whether the provided mic_token verifies message. */ 263 264 u32 265 gss_verify_mic(struct gss_ctx *context_handle, 266 struct xdr_buf *message, 267 struct xdr_netobj *mic_token) 268 { 269 return context_handle->mech_type->gm_ops 270 ->gss_verify_mic(context_handle, 271 message, 272 mic_token); 273 } 274 275 u32 276 gss_wrap(struct gss_ctx *ctx_id, 277 int offset, 278 struct xdr_buf *buf, 279 struct page **inpages) 280 { 281 return ctx_id->mech_type->gm_ops 282 ->gss_wrap(ctx_id, offset, buf, inpages); 283 } 284 285 u32 286 gss_unwrap(struct gss_ctx *ctx_id, 287 int offset, 288 struct xdr_buf *buf) 289 { 290 return ctx_id->mech_type->gm_ops 291 ->gss_unwrap(ctx_id, offset, buf); 292 } 293 294 295 /* gss_delete_sec_context: free all resources associated with context_handle. 296 * Note this differs from the RFC 2744-specified prototype in that we don't 297 * bother returning an output token, since it would never be used anyway. */ 298 299 u32 300 gss_delete_sec_context(struct gss_ctx **context_handle) 301 { 302 dprintk("RPC: gss_delete_sec_context deleting %p\n", 303 *context_handle); 304 305 if (!*context_handle) 306 return(GSS_S_NO_CONTEXT); 307 if ((*context_handle)->internal_ctx_id != 0) 308 (*context_handle)->mech_type->gm_ops 309 ->gss_delete_sec_context((*context_handle) 310 ->internal_ctx_id); 311 if ((*context_handle)->mech_type) 312 gss_mech_put((*context_handle)->mech_type); 313 kfree(*context_handle); 314 *context_handle=NULL; 315 return GSS_S_COMPLETE; 316 } 317