2 * Copyright (c) 2005 Doug Rabson
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
26 * $FreeBSD: src/lib/libgssapi/gss_mech_switch.c,v 1.2 2006/02/04 09:40:21 dfr Exp $
29 #include "mech_locl.h"
30 #include <heim_threads.h>
32 #ifndef _PATH_GSS_MECH
33 #define _PATH_GSS_MECH "/etc/gss/mech"
36 struct _gss_mech_switch_list _gss_mechs = { NULL, NULL } ;
37 gss_OID_set _gss_mech_oids;
38 static HEIMDAL_MUTEX _gss_mech_mutex = HEIMDAL_MUTEX_INITIALIZER;
41 * Convert a string containing an OID in 'dot' form
42 * (e.g. 1.2.840.113554.1.2.2) to a gss_OID.
45 _gss_string_to_oid(const char* s, gss_OID *oidp)
47 int number_count, i, j;
56 * First figure out how many numbers in the oid, then
57 * calculate the compiled oid size.
60 for (p = s; p; p = q) {
67 * The first two numbers are in the first byte and each
68 * subsequent number is encoded in a variable byte sequence.
74 * We do this in two passes. The first pass, we just figure
75 * out the size. Second time around, we actually encode the
79 for (i = 0; i < 2; i++) {
81 for (p = s, j = 0; p; p = q, j++) {
82 unsigned int number = 0;
85 * Find the end of this number.
91 * Read the number of of the string. Don't
92 * bother with anything except base ten.
94 while (*p && *p != '.') {
95 number = 10 * number + (*p - '0');
100 * Encode the number. The first two numbers
101 * are packed into the first byte. Subsequent
102 * numbers are encoded in bytes seven bits at
103 * a time with the last byte having the high
117 * The number is encoded in seven bit chunks.
123 for (t = number; t; t >>= 7)
125 if (bytes == 0) bytes = 1;
128 int bit = 7*(bytes-1);
130 *res = (number >> bit) & 0x7f;
141 res = malloc(byte_count);
144 oid.length = byte_count;
150 OM_uint32 minor_status, tmp;
152 if (GSS_ERROR(_gss_intern_oid(&minor_status, &oid, oidp))) {
153 _gss_free_oid(&tmp, &oid);
154 return (minor_status);
157 _gss_free_oid(&tmp, &oid);
165 m->gm_mech.gm_ ## name = (_gss_##name##_t *)dlsym(so, "gss_" #name); \
166 if (!m->gm_mech.gm_ ## name || \
167 m->gm_mech.gm_ ##name == gss_ ## name) { \
168 _gss_mg_log(1, "can't find symbol gss_" #name "\n"); \
173 #define OPTSYM(name) \
175 m->gm_mech.gm_ ## name = (_gss_##name##_t *)dlsym(so, "gss_" #name); \
176 if (m->gm_mech.gm_ ## name == gss_ ## name) \
177 m->gm_mech.gm_ ## name = NULL; \
180 /* mech exports gssspi_XXX, internally referred to as gss_XXX */
181 #define OPTSPISYM(name) \
183 m->gm_mech.gm_ ## name = (_gss_##name##_t *)dlsym(so, "gssspi_" #name); \
186 /* mech exports gssspi_XXX, internally referred to as gssspi_XXX */
187 #define OPTSPISPISYM(name) \
189 m->gm_mech.gm_ ## name = (_gss_##name##_t *)dlsym(so, "gssspi_" #name); \
190 if (m->gm_mech.gm_ ## name == gssspi_ ## name) \
191 m->gm_mech.gm_ ## name = NULL; \
194 #define COMPATSYM(name) \
196 m->gm_mech.gm_compat->gmc_ ## name = (_gss_##name##_t *)dlsym(so, "gss_" #name); \
197 if (m->gm_mech.gm_compat->gmc_ ## name == gss_ ## name) \
198 m->gm_mech.gm_compat->gmc_ ## name = NULL; \
201 #define COMPATSPISYM(name) \
203 m->gm_mech.gm_compat->gmc_ ## name = (_gss_##name##_t *)dlsym(so, "gssspi_" #name); \
204 if (m->gm_mech.gm_compat->gmc_ ## name == gss_ ## name) \
205 m->gm_mech.gm_compat->gmc_ ## name = NULL; \
212 add_builtin(gssapi_mech_interface mech)
214 struct _gss_mech_switch *m;
215 OM_uint32 minor_status;
217 /* not registering any mech is ok */
221 m = calloc(1, sizeof(*m));
226 _gss_intern_oid(&minor_status, &mech->gm_mech_oid, &m->gm_mech_oid);
231 gss_add_oid_set_member(&minor_status,
232 &m->gm_mech.gm_mech_oid, &_gss_mech_oids);
234 /* pick up the oid sets of names */
236 if (m->gm_mech.gm_inquire_names_for_mech)
237 (*m->gm_mech.gm_inquire_names_for_mech)(&minor_status,
238 &m->gm_mech.gm_mech_oid, &m->gm_name_types);
240 if (m->gm_name_types == NULL)
241 gss_create_empty_oid_set(&minor_status, &m->gm_name_types);
243 HEIM_TAILQ_INSERT_TAIL(&_gss_mechs, m, gm_link);
248 init_mech_switch_list(void *p)
250 struct _gss_mech_switch_list *mechs = p;
252 HEIM_TAILQ_INIT(mechs);
256 * Load the mechanisms file (/etc/gss/mech).
261 OM_uint32 major_status, minor_status;
262 static heim_base_once_t once = HEIM_BASE_ONCE_INIT;
267 char *name, *oid, *lib, *kobj;
268 struct _gss_mech_switch *m;
272 const char *conf = secure_getenv("GSS_MECH_CONFIG");
275 heim_base_once_f(&once, &_gss_mechs, init_mech_switch_list);
277 HEIMDAL_MUTEX_lock(&_gss_mech_mutex);
279 if (!HEIM_TAILQ_EMPTY(&_gss_mechs)) {
280 HEIMDAL_MUTEX_unlock(&_gss_mech_mutex);
284 major_status = gss_create_empty_oid_set(&minor_status,
287 HEIMDAL_MUTEX_unlock(&_gss_mech_mutex);
291 add_builtin(__gss_krb5_initialize());
292 add_builtin(__gss_spnego_initialize());
293 add_builtin(__gss_ntlm_initialize());
296 fp = fopen(conf ? conf : _PATH_GSS_MECH, "r");
301 while (fgets(buf, sizeof(buf), fp)) {
307 name = strsep(&p, "\t\n ");
308 if (p) while (isspace((unsigned char)*p)) p++;
309 oid = strsep(&p, "\t\n ");
310 if (p) while (isspace((unsigned char)*p)) p++;
311 lib = strsep(&p, "\t\n ");
312 if (p) while (isspace((unsigned char)*p)) p++;
313 kobj = strsep(&p, "\t\n ");
314 if (!name || !oid || !lib || !kobj)
317 if (_gss_string_to_oid(oid, &mech_oid))
321 * Check for duplicates, already loaded mechs.
324 HEIM_TAILQ_FOREACH(m, &_gss_mechs, gm_link) {
325 if (gss_oid_equal(&m->gm_mech.gm_mech_oid, mech_oid)) {
333 so = dlopen(lib, RTLD_LAZY | RTLD_LOCAL | RTLD_GROUP);
335 _gss_mg_log(1, "dlopen: %s\n", dlerror());
339 m = calloc(1, sizeof(*m));
344 m->gm_mech_oid = mech_oid;
345 m->gm_mech.gm_name = strdup(name);
346 m->gm_mech.gm_mech_oid = *mech_oid;
347 m->gm_mech.gm_flags = 0;
348 m->gm_mech.gm_compat = calloc(1, sizeof(struct gss_mech_compat_desc_struct));
349 if (m->gm_mech.gm_compat == NULL)
352 major_status = gss_add_oid_set_member(&minor_status,
353 &m->gm_mech.gm_mech_oid, &_gss_mech_oids);
354 if (GSS_ERROR(major_status))
359 SYM(init_sec_context);
360 SYM(accept_sec_context);
361 SYM(process_context_token);
362 SYM(delete_sec_context);
368 OPTSYM(display_status);
369 OPTSYM(indicate_mechs);
375 OPTSYM(inquire_cred);
376 SYM(inquire_context);
377 SYM(wrap_size_limit);
379 OPTSYM(inquire_cred_by_mech);
380 SYM(export_sec_context);
381 SYM(import_sec_context);
382 OPTSYM(inquire_names_for_mech);
383 OPTSYM(inquire_mechs_for_name);
384 SYM(canonicalize_name);
386 OPTSYM(inquire_cred_by_oid);
387 OPTSYM(inquire_sec_context_by_oid);
388 OPTSYM(set_sec_context_option);
389 OPTSPISYM(set_cred_option);
390 OPTSYM(pseudo_random);
393 OPTSYM(wrap_iov_length);
397 OPTSYM(acquire_cred_from);
398 OPTSYM(acquire_cred_impersonate_name);
401 OPTSYM(destroy_cred);
404 OPTSYM(cred_label_get);
405 OPTSYM(cred_label_set);
407 OPTSYM(display_name_ext);
408 OPTSYM(inquire_name);
409 OPTSYM(get_name_attribute);
410 OPTSYM(set_name_attribute);
411 OPTSYM(delete_name_attribute);
412 OPTSYM(export_name_composite);
414 OPTSYM(duplicate_cred);
415 OPTSYM(add_cred_from);
416 OPTSYM(store_cred_into);
417 OPTSPISYM(authorize_localname);
418 OPTSPISPISYM(query_mechanism_info);
419 OPTSPISPISYM(query_meta_data);
420 OPTSPISPISYM(exchange_meta_data);
422 mi = (_gss_mo_init *)dlsym(so, "gss_mo_init");
424 major_status = mi(&minor_status, mech_oid,
425 &m->gm_mech.gm_mo, &m->gm_mech.gm_mo_num);
426 if (GSS_ERROR(major_status))
429 /* API-as-SPI compatibility */
430 COMPATSYM(inquire_saslname_for_mech);
431 COMPATSYM(inquire_mech_for_saslname);
432 COMPATSYM(inquire_attrs_for_mech);
433 COMPATSPISYM(acquire_cred_with_password);
436 /* pick up the oid sets of names */
438 if (m->gm_mech.gm_inquire_names_for_mech)
439 (*m->gm_mech.gm_inquire_names_for_mech)(&minor_status,
440 &m->gm_mech.gm_mech_oid, &m->gm_name_types);
442 if (m->gm_name_types == NULL)
443 gss_create_empty_oid_set(&minor_status, &m->gm_name_types);
445 HEIM_TAILQ_INSERT_TAIL(&_gss_mechs, m, gm_link);
450 free(m->gm_mech.gm_compat);
451 /* do not free OID, it has been interned */
452 free((char *)m->gm_mech.gm_name);
464 add_builtin(__gss_sanon_initialize());
465 HEIMDAL_MUTEX_unlock(&_gss_mech_mutex);
468 gssapi_mech_interface
469 __gss_get_mechanism(gss_const_OID mech)
471 struct _gss_mech_switch *m;
474 HEIM_TAILQ_FOREACH(m, &_gss_mechs, gm_link) {
475 if (gss_oid_equal(&m->gm_mech.gm_mech_oid, mech))
482 _gss_mg_support_mechanism(gss_const_OID mech)
484 struct _gss_mech_switch *m;
487 HEIM_TAILQ_FOREACH(m, &_gss_mechs, gm_link) {
488 if (gss_oid_equal(&m->gm_mech.gm_mech_oid, mech))
489 return m->gm_mech_oid;
494 enum mech_name_match {
500 static enum mech_name_match
501 match_mech_name(const char *gm_mech_name,
505 if (gm_mech_name == NULL)
507 else if (strcasecmp(gm_mech_name, name) == 0)
508 return MATCH_COMPLETE;
509 else if (strncasecmp(gm_mech_name, name, namelen) == 0)
510 return MATCH_PARTIAL;
516 * Return an OID for a built-in or dynamically loaded mechanism. For
517 * API compatibility with previous versions, we treat "Kerberos 5"
518 * as an alias for "krb5". Unique partial matches are supported.
520 GSSAPI_LIB_FUNCTION gss_OID GSSAPI_CALLCONV
521 gss_name_to_oid(const char *name)
523 struct _gss_mech_switch *m, *partial = NULL;
524 gss_OID oid = GSS_C_NO_OID;
525 size_t namelen = strlen(name);
527 if (isdigit(name[0]) && _gss_string_to_oid(name, &oid) == 0)
531 HEIM_TAILQ_FOREACH(m, &_gss_mechs, gm_link) {
532 enum mech_name_match match;
534 match = match_mech_name(m->gm_mech.gm_name, name, namelen);
535 if (match == MATCH_NONE &&
536 gss_oid_equal(m->gm_mech_oid, GSS_KRB5_MECHANISM))
537 match = match_mech_name("Kerberos 5", name, namelen);
539 if (match == MATCH_COMPLETE)
540 return m->gm_mech_oid;
541 else if (match == MATCH_PARTIAL) {
550 return partial->gm_mech_oid;
555 GSSAPI_LIB_FUNCTION const char * GSSAPI_LIB_CALL
556 gss_oid_to_name(gss_const_OID oid)
558 struct _gss_mech_switch *m;
561 HEIM_TAILQ_FOREACH(m, &_gss_mechs, gm_link) {
562 if (gss_oid_equal(m->gm_mech_oid, oid))
563 return m->gm_mech.gm_name;
569 GSSAPI_LIB_FUNCTION uintptr_t GSSAPI_CALLCONV
570 gss_get_instance(const char *libname)
572 static const char *instance = "libgssapi";
574 if (strcmp(libname, "gssapi") == 0)
575 return (uintptr_t)instance;
576 else if (strcmp(libname, "krb5") == 0)
577 return krb5_get_instance(libname);