2 * Modifications for Lustre
4 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
6 * Copyright (c) 2011, Intel Corporation.
8 * Author: Eric Mei <ericm@clusterfs.com>
12 * Adapted in part from MIT Kerberos 5-1.2.1 slave/kprop.c and from
13 * http://docs.sun.com/?p=/doc/816-1331/6m7oo9sms&a=view
15 * Copyright (c) 2002 The Regents of the University of Michigan.
16 * All rights reserved.
18 * Andy Adamson <andros@umich.edu>
19 * J. Bruce Fields <bfields@umich.edu>
20 * Marius Aamodt Eriksen <marius@umich.edu>
26 * Copyright 1990,1991 by the Massachusetts Institute of Technology.
27 * All Rights Reserved.
29 * Export of this software from the United States of America may
30 * require a specific license from the United States Government.
31 * It is the responsibility of any person or organization contemplating
32 * export to obtain such a license before exporting.
34 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
35 * distribute this software and its documentation for any purpose and
36 * without fee is hereby granted, provided that the above copyright
37 * notice appear in all copies and that both that copyright notice and
38 * this permission notice appear in supporting documentation, and that
39 * the name of M.I.T. not be used in advertising or publicity pertaining
40 * to distribution of the software without specific, written prior
41 * permission. Furthermore if you modify this software you must label
42 * your software as modified software and not distribute it in such a
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44 * M.I.T. makes no representations about the suitability of
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50 * Copyright 1994 by OpenVision Technologies, Inc.
52 * Permission to use, copy, modify, distribute, and sell this software
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74 #include <sys/types.h>
87 #include <gssapi/gssapi.h>
88 #if defined(HAVE_KRB5) && !defined(GSS_C_NT_HOSTBASED_SERVICE)
89 #include <gssapi/gssapi_generic.h>
90 #define GSS_C_NT_HOSTBASED_SERVICE gss_nt_service_name
100 #include "lsupport.h"
101 #include "lgss_utils.h"
102 #include "lgss_krb5_utils.h"
104 const char *lgss_svc_str[LGSS_SVC_MAX] = {
105 [LGSS_SVC_MGS] = LGSS_SVC_MGS_STR,
106 [LGSS_SVC_MDS] = LGSS_SVC_MDS_STR,
107 [LGSS_SVC_OSS] = LGSS_SVC_OSS_STR,
110 /****************************************
111 * inter-process locking *
112 ****************************************/
114 static struct lgss_mutex_s {
118 } lgss_mutexes[LGSS_MUTEX_MAX] = {
119 [LGSS_MUTEX_KRB5] = { "keyring", 0x4292d473, 0 },
122 static int lgss_mutex_get(struct lgss_mutex_s *mutex)
124 mutex->sem_id = semget(mutex->sem_key, 1, IPC_CREAT | IPC_EXCL | 0700);
125 if (mutex->sem_id != -1) {
126 if (semctl(mutex->sem_id, 0, SETVAL, 1) == -1) {
127 logmsg(LL_ERR, "initialize sem %x: %s\n",
128 mutex->sem_key, strerror(errno));
132 logmsg(LL_DEBUG, "created & initialized sem %x id %d for %s\n",
133 mutex->sem_key, mutex->sem_id, mutex->sem_name);
135 if (errno != EEXIST) {
136 logmsg(LL_ERR, "create sem %x: %s\n",
137 mutex->sem_key, strerror(errno));
141 /* already created by someone else, simply get it.
142 * Note there's still a small window of racing between create
143 * and initialize, a flaw in semaphore semantics */
144 mutex->sem_id = semget(mutex->sem_key, 0, 0700);
145 if (mutex->sem_id == -1) {
146 if (errno == ENOENT) {
147 logmsg(LL_WARN, "sem %x just disappeared "
148 "under us, try again\n", mutex->sem_key);
152 logmsg(LL_ERR, "get sem %x: %s\n", mutex->sem_key,
157 logmsg(LL_TRACE, "got sem %x id %d for %s\n",
158 mutex->sem_key, mutex->sem_id, mutex->sem_name);
164 int lgss_mutex_lock(lgss_mutex_id_t mid)
166 struct lgss_mutex_s *sem = &lgss_mutexes[mid];
167 struct sembuf sembuf;
170 lassert(mid < LGSS_MUTEX_MAX);
172 logmsg(LL_TRACE, "locking mutex %x for %s\n",
173 sem->sem_key, sem->sem_name);
176 rc = lgss_mutex_get(sem);
183 sembuf.sem_flg = SEM_UNDO;
185 if (semop(sem->sem_id, &sembuf, 1) != 0) {
186 logmsg(LL_ERR, "lock mutex %x: %s\n", sem->sem_key,
191 logmsg(LL_DEBUG, "locked mutex %x for %s\n",
192 sem->sem_key, sem->sem_name);
196 int lgss_mutex_unlock(lgss_mutex_id_t mid)
198 struct lgss_mutex_s *sem = &lgss_mutexes[mid];
199 struct sembuf sembuf;
201 lassert(mid < LGSS_MUTEX_MAX);
202 lassert(sem->sem_id >= 0);
204 logmsg(LL_TRACE, "unlocking mutex %x for %s\n",
205 sem->sem_key, sem->sem_name);
209 sembuf.sem_flg = SEM_UNDO;
211 if (semop(sem->sem_id, &sembuf, 1) != 0) {
212 logmsg(LL_ERR, "unlock mutex %x: %s\n", sem->sem_key,
217 logmsg(LL_DEBUG, "unlocked mutex %x for %s\n",
218 sem->sem_key, sem->sem_name);
222 /****************************************
224 ****************************************/
226 /* from kerberos source, gssapi_krb5.c */
227 gss_OID_desc krb5oid = {
229 .elements = "\052\206\110\206\367\022\001\002\002"
231 gss_OID_desc spkm3oid = {
233 .elements = "\053\006\001\005\005\001\003"
235 /* null and sk come from IU's oid space */
236 gss_OID_desc nulloid = {
238 .elements = "\053\006\001\004\001\311\146\215\126\001\000\000"
240 gss_OID_desc skoid = {
242 .elements = "\053\006\001\004\001\311\146\215\126\001\000\001"
245 /****************************************
247 ****************************************/
249 loglevel_t g_log_level = LL_WARN;
251 static const char *log_prefix[] = {
253 [LL_WARN] = "WARNING",
255 [LL_DEBUG] = "DEBUG",
256 [LL_TRACE] = "TRACE",
259 void lgss_set_loglevel(loglevel_t level)
261 lassert(level < LL_MAX);
265 void __logmsg(loglevel_t level, const char *func, const char *format, ...)
271 offset = snprintf(buf, sizeof(buf), "[%d]:%s:%s(): ",
272 getpid(), log_prefix[level], func);
274 va_start(ap, format);
275 vsnprintf(buf + offset, sizeof(buf) - offset, format, ap);
278 syslog(LOG_INFO, "%s", buf);
281 void __logmsg_gss(loglevel_t level, const char *func, const gss_OID mech,
282 uint32_t major, uint32_t minor, const char *format, ...)
285 u_int32_t maj_stat1, min_stat1;
286 u_int32_t maj_stat2, min_stat2;
287 gss_buffer_desc maj_gss_buf = GSS_C_EMPTY_BUFFER;
288 gss_buffer_desc min_gss_buf = GSS_C_EMPTY_BUFFER;
290 char maj_buf[30], min_buf[30];
291 char *maj_msg, *min_msg;
293 uint32_t msg_ctx = 0;
295 /* Get major status message */
296 maj_stat1 = gss_display_status(&min_stat1, major, GSS_C_GSS_CODE,
297 mech, &msg_ctx, &maj_gss_buf);
298 if (maj_stat1 != GSS_S_COMPLETE) {
299 snprintf(maj_buf, sizeof(maj_buf), "(0x%08x)", major);
300 maj_msg = &maj_buf[0];
302 maj_msg = maj_gss_buf.value;
305 /* Get minor status message */
306 maj_stat2 = gss_display_status(&min_stat2, minor, GSS_C_MECH_CODE,
307 mech, &msg_ctx, &min_gss_buf);
308 if (maj_stat2 != GSS_S_COMPLETE) {
309 snprintf(min_buf, sizeof(min_buf), "(0x%08x)", minor);
310 min_msg = &min_buf[0];
312 min_msg = min_gss_buf.value;
315 /* arrange & log message */
316 offset = snprintf(buf, sizeof(buf), "[%d]:%s:%s(): ",
317 getpid(), log_prefix[level], func);
319 va_start(ap, format);
320 offset += vsnprintf(buf + offset, sizeof(buf) - offset, format, ap);
323 snprintf(buf + offset, sizeof(buf) - offset, ": GSSAPI: %s - %s\n",
326 syslog(LOG_INFO, "%s", buf);
328 /* release buffers */
329 if (maj_gss_buf.length != 0)
330 gss_release_buffer(&min_stat1, &maj_gss_buf);
331 if (min_gss_buf.length != 0)
332 gss_release_buffer(&min_stat2, &min_gss_buf);
335 /****************************************
336 * client credentials *
337 ****************************************/
339 struct lgss_mech_type *lgss_name2mech(const char *mech_name)
341 if (strcmp(mech_name, "krb5") == 0)
342 return &lgss_mech_krb5;
343 if (strcmp(mech_name, "gssnull") == 0)
344 return &lgss_mech_null;
345 if (strcmp(mech_name, "sk") == 0)
346 return &lgss_mech_sk;
350 int lgss_mech_initialize(struct lgss_mech_type *mech)
352 logmsg(LL_TRACE, "initialize mech %s\n", mech->lmt_name);
354 return mech->lmt_init();
358 void lgss_mech_finalize(struct lgss_mech_type *mech)
360 logmsg(LL_TRACE, "finalize mech %s\n", mech->lmt_name);
365 struct lgss_cred * lgss_create_cred(struct lgss_mech_type *mech)
367 struct lgss_cred *cred;
369 cred = malloc(sizeof(*cred));
371 memset(cred, 0, sizeof(*cred));
372 cred->lc_mech = mech;
375 logmsg(LL_TRACE, "create a %s cred at %p\n", mech->lmt_name, cred);
379 void lgss_destroy_cred(struct lgss_cred *cred)
381 lassert(cred->lc_mech != NULL);
382 lassert(cred->lc_mech_cred == NULL);
384 logmsg(LL_TRACE, "destroying a %s cred at %p\n",
385 cred->lc_mech->lmt_name, cred);
389 int lgss_prepare_cred(struct lgss_cred *cred)
391 struct lgss_mech_type *mech = cred->lc_mech;
393 lassert(mech != NULL);
395 logmsg(LL_TRACE, "preparing %s cred %p\n", mech->lmt_name, cred);
397 if (mech->lmt_prepare_cred)
398 return mech->lmt_prepare_cred(cred);
402 void lgss_release_cred(struct lgss_cred *cred)
404 struct lgss_mech_type *mech = cred->lc_mech;
406 lassert(mech != NULL);
408 logmsg(LL_TRACE, "releasing %s cred %p\n", mech->lmt_name, cred);
410 if (cred->lc_mech_cred) {
411 lassert(cred->lc_mech != NULL);
412 lassert(cred->lc_mech->lmt_release_cred != NULL);
414 cred->lc_mech->lmt_release_cred(cred);
418 int lgss_using_cred(struct lgss_cred *cred)
420 struct lgss_mech_type *mech = cred->lc_mech;
422 lassert(mech != NULL);
424 logmsg(LL_TRACE, "using %s cred %p\n", mech->lmt_name, cred);
426 if (mech->lmt_using_cred)
427 return mech->lmt_using_cred(cred);
431 int lgss_validate_cred(struct lgss_cred *cred, gss_buffer_desc *token,
432 gss_buffer_desc *ctx_token)
434 struct lgss_mech_type *mech = cred->lc_mech;
436 lassert(mech != NULL);
438 logmsg(LL_TRACE, "validate %s cred %p with token %p\n", mech->lmt_name,
441 if (mech->lmt_validate_cred)
442 return mech->lmt_validate_cred(cred, token, ctx_token);
447 /****************************************
449 ****************************************/
451 int lgss_get_service_str(char **string, uint32_t lsvc, uint64_t tgt_nid)
453 const int max_namelen = 512;
454 char namebuf[max_namelen];
457 lassert(*string == NULL);
459 if (lsvc >= LGSS_SVC_MAX) {
460 logmsg(LL_ERR, "invalid lgss service %d\n", lsvc);
464 if (lnet_nid2hostname(tgt_nid, namebuf, max_namelen)) {
465 logmsg(LL_ERR, "cannot resolve hostname from nid %"PRIx64"\n",
470 alloc_size = 32 + strlen(namebuf);
472 *string = malloc(alloc_size);
473 if (*string == NULL) {
474 logmsg(LL_ERR, "can't malloc %d bytes\n", alloc_size);
478 snprintf(*string, alloc_size, "%s@%s",
479 lgss_svc_str[lsvc], namebuf);
481 logmsg(LL_DEBUG, "constructed service string: %s\n", *string);