2 * Copyright 2000, International Business Machines Corporation and others.
5 * This software has been released under the terms of the IBM Public
6 * License. For details, see the LICENSE file in the top-level source
7 * directory or online at http://www.openafs.org/dl/license10.html
16 #include <afsconfig.h>
17 #include "afs/param.h"
18 #ifdef LINUX_KEYRING_SUPPORT
19 #include <linux/seq_file.h>
23 #include "afs/sysincludes.h"
24 #include "afsincludes.h"
25 #include "afs/afs_stats.h" /* statistics */
26 #include "afs/nfsclient.h"
27 #include "osi_compat.h"
29 #ifdef AFS_LINUX26_ONEGROUP_ENV
30 # define NUMPAGGROUPS 1
33 afs_linux_pag_from_groups(struct group_info *group_info) {
37 if (group_info->ngroups < NUMPAGGROUPS)
40 for (i = 0; (i < group_info->ngroups &&
41 (g0 = GROUP_AT(group_info, i)) != (gid_t) NOGROUP); i++) {
42 if (((g0 >> 24) & 0xff) == 'A')
49 afs_linux_pag_to_groups(afs_uint32 newpag,
50 struct group_info *old, struct group_info **new) {
55 if (afs_linux_pag_from_groups(old) == NOPAG)
56 need_space = NUMPAGGROUPS;
58 *new = groups_alloc(old->ngroups + need_space);
60 for (i = 0, j = 0; i < old->ngroups; ++i) {
61 int ths = GROUP_AT(old, i);
62 int last = i > 0 ? GROUP_AT(old, i-1) : 0;
63 if ((ths >> 24) == 'A')
65 if (last <= newpag && ths > newpag) {
66 GROUP_AT(*new, j) = newpag;
69 GROUP_AT(*new, j) = ths;
72 if (j != i + need_space)
73 GROUP_AT(*new, j) = newpag;
77 # define NUMPAGGROUPS 2
79 static inline afs_uint32
80 afs_linux_pag_from_groups(struct group_info *group_info) {
82 if (group_info->ngroups < NUMPAGGROUPS)
85 return afs_get_pag_from_groups(GROUP_AT(group_info, 0), GROUP_AT(group_info, 1));
89 afs_linux_pag_to_groups(afs_uint32 newpag,
90 struct group_info *old, struct group_info **new) {
96 if (afs_linux_pag_from_groups(old) == NOPAG)
97 need_space = NUMPAGGGROUPS;
99 *new = groups_alloc(old->ngroups + need_space);
101 for (i = 0; i < old->ngroups; ++i)
102 GROUP_AT(new, i + need_space) = GROUP_AT(old, i);
104 afs_get_groups_from_pag(newpag, &g0, g1);
105 GROUP_AT(new, 0) = g0;
106 GROUP_AT(new, 1) = g1;
111 osi_get_group_pag(afs_ucred_t *cred) {
112 return afs_linux_pag_from_groups(afs_cr_group_info(cred));
117 afs_setgroups(cred_t **cr, struct group_info *group_info, int change_parent)
119 struct group_info *old_info;
121 AFS_STATCNT(afs_setgroups);
123 old_info = afs_cr_group_info(*cr);
124 get_group_info(group_info);
125 afs_set_cr_group_info(*cr, group_info);
126 put_group_info(old_info);
130 #if defined(STRUCT_TASK_STRUCT_HAS_PARENT) && !defined(STRUCT_TASK_STRUCT_HAS_CRED)
132 old_info = current->parent->group_info;
133 get_group_info(group_info);
134 current->parent->group_info = group_info;
135 put_group_info(old_info);
143 __setpag(cred_t **cr, afs_uint32 pagvalue, afs_uint32 *newpag,
144 int change_parent, struct group_info **old_groups)
146 struct group_info *group_info;
147 struct group_info *tmp;
149 get_group_info(afs_cr_group_info(*cr));
150 group_info = afs_cr_group_info(*cr);
152 *newpag = (pagvalue == -1 ? genpag() : pagvalue);
153 afs_linux_pag_to_groups(*newpag, group_info, &tmp);
156 *old_groups = group_info;
158 put_group_info(group_info);
162 afs_setgroups(cr, tmp, change_parent);
169 #ifdef LINUX_KEYRING_SUPPORT
170 extern struct key_type key_type_keyring __attribute__((weak));
171 static struct key_type *__key_type_keyring = &key_type_keyring;
173 /* install_session_keyring returns negative error values */
175 install_session_keyring(struct key *keyring)
182 if (!__key_type_keyring)
187 /* create an empty session keyring */
188 sprintf(desc, "_ses.%u", current->tgid);
190 /* if we're root, don't count the keyring against our quota. This
191 * avoids starvation issues when dealing with PAM modules that always
192 * setpag() as root */
193 if (current_uid() == 0)
194 flags = KEY_ALLOC_NOT_IN_QUOTA;
196 flags = KEY_ALLOC_IN_QUOTA;
198 keyring = afs_linux_key_alloc(
199 __key_type_keyring, desc,
200 current_uid(), current_gid(),
201 (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_ALL,
204 if (IS_ERR(keyring)) {
205 code = PTR_ERR(keyring);
210 code = key_instantiate_and_link(keyring, NULL, 0, NULL, NULL);
216 /* install the keyring */
217 old = afs_set_session_keyring(keyring);
224 #endif /* LINUX_KEYRING_SUPPORT */
226 /* Error codes from setpag must be positive, otherwise they don't
227 * make it back into userspace properly. Error codes from the
228 * Linux keyring utilities, and from install_session_keyring()
229 * are negative. So we need to be careful to convert them correctly
233 setpag(cred_t **cr, afs_uint32 pagvalue, afs_uint32 *newpag,
237 struct group_info *old_groups = NULL;
241 code = __setpag(cr, pagvalue, newpag, change_parent, &old_groups);
243 #ifdef LINUX_KEYRING_SUPPORT
244 if (code == 0 && afs_cr_rgid(*cr) != NFSXLATOR_CRED) {
245 code = install_session_keyring(NULL);
246 if (code == 0 && current_session_keyring()) {
250 perm = KEY_POS_VIEW | KEY_POS_SEARCH;
251 perm |= KEY_USR_VIEW | KEY_USR_SEARCH;
253 key = afs_linux_key_alloc(&key_type_afs_pag, "_pag", 0, 0, perm, KEY_ALLOC_NOT_IN_QUOTA);
256 code = key_instantiate_and_link(key, (void *) newpag, sizeof(afs_uint32),
257 current_session_keyring(), NULL);
266 #endif /* LINUX_KEYRING_SUPPORT */
270 afs_setgroups(cr, old_groups, change_parent);
271 put_group_info(old_groups);
275 afs_MarkUserExpired(*newpag);
284 /* Intercept the standard system call. */
285 extern asmlinkage long (*sys_setgroupsp) (int gidsetsize, gid_t * grouplist);
287 afs_xsetgroups(int gidsetsize, gid_t * grouplist)
290 cred_t *cr = crref();
294 old_pag = PagInCred(cr);
297 code = (*sys_setgroupsp) (gidsetsize, grouplist);
303 if (old_pag != NOPAG && PagInCred(cr) == NOPAG) {
304 /* re-install old pag if there's room. */
305 code = __setpag(&cr, old_pag, &junk, 0, NULL);
309 /* Linux syscall ABI returns errno as negative */
313 /* Intercept the standard uid32 system call. */
314 extern asmlinkage int (*sys_setgroups32p) (int gidsetsize,
315 __kernel_gid32_t * grouplist);
317 afs_xsetgroups32(int gidsetsize, gid_t * grouplist)
320 cred_t *cr = crref();
324 old_pag = PagInCred(cr);
327 code = (*sys_setgroups32p) (gidsetsize, grouplist);
334 if (old_pag != NOPAG && PagInCred(cr) == NOPAG) {
335 /* re-install old pag if there's room. */
336 code = __setpag(&cr, old_pag, &junk, 0, NULL);
340 /* Linux syscall ABI returns errno as negative */
344 #if defined(AFS_PPC64_LINUX20_ENV)
345 /* Intercept the uid16 system call as used by 32bit programs. */
346 extern asmlinkage long (*sys32_setgroupsp)(int gidsetsize, gid_t *grouplist);
347 asmlinkage long afs32_xsetgroups(int gidsetsize, gid_t *grouplist)
350 cred_t *cr = crref();
354 old_pag = PagInCred(cr);
357 code = (*sys32_setgroupsp)(gidsetsize, grouplist);
363 if (old_pag != NOPAG && PagInCred(cr) == NOPAG) {
364 /* re-install old pag if there's room. */
365 code = __setpag(&cr, old_pag, &junk, 0, NULL);
369 /* Linux syscall ABI returns errno as negative */
374 #if defined(AFS_SPARC64_LINUX20_ENV) || defined(AFS_AMD64_LINUX20_ENV)
375 /* Intercept the uid16 system call as used by 32bit programs. */
376 #ifdef AFS_AMD64_LINUX20_ENV
377 extern asmlinkage long (*sys32_setgroupsp) (int gidsetsize, u16 * grouplist);
378 #endif /* AFS_AMD64_LINUX20_ENV */
379 #ifdef AFS_SPARC64_LINUX26_ENV
380 extern asmlinkage int (*sys32_setgroupsp) (int gidsetsize,
381 __kernel_gid32_t * grouplist);
382 #endif /* AFS_SPARC64_LINUX26_ENV */
384 afs32_xsetgroups(int gidsetsize, u16 * grouplist)
387 cred_t *cr = crref();
391 old_pag = PagInCred(cr);
394 code = (*sys32_setgroupsp) (gidsetsize, grouplist);
400 if (old_pag != NOPAG && PagInCred(cr) == NOPAG) {
401 /* re-install old pag if there's room. */
402 code = __setpag(&cr, old_pag, &junk, 0, NULL);
406 /* Linux syscall ABI returns errno as negative */
410 /* Intercept the uid32 system call as used by 32bit programs. */
411 #ifdef AFS_AMD64_LINUX20_ENV
412 extern asmlinkage long (*sys32_setgroups32p) (int gidsetsize, gid_t * grouplist);
413 #endif /* AFS_AMD64_LINUX20_ENV */
414 #ifdef AFS_SPARC64_LINUX26_ENV
415 extern asmlinkage int (*sys32_setgroups32p) (int gidsetsize,
416 __kernel_gid32_t * grouplist);
417 #endif /* AFS_SPARC64_LINUX26_ENV */
419 afs32_xsetgroups32(int gidsetsize, gid_t * grouplist)
422 cred_t *cr = crref();
426 old_pag = PagInCred(cr);
429 code = (*sys32_setgroups32p) (gidsetsize, grouplist);
435 if (old_pag != NOPAG && PagInCred(cr) == NOPAG) {
436 /* re-install old pag if there's room. */
437 code = __setpag(&cr, old_pag, &junk, 0, NULL);
441 /* Linux syscall ABI returns errno as negative */
447 #ifdef LINUX_KEYRING_SUPPORT
448 static void afs_pag_describe(const struct key *key, struct seq_file *m)
450 seq_puts(m, key->description);
452 seq_printf(m, ": %u", key->datalen);
455 #if defined(STRUCT_KEY_TYPE_HAS_PREPARSE)
456 static int afs_pag_instantiate(struct key *key, struct key_preparsed_payload *prep)
458 static int afs_pag_instantiate(struct key *key, const void *data, size_t datalen)
462 afs_uint32 *userpag, pag = NOPAG;
464 if (key->uid != 0 || key->gid != 0)
468 get_group_info(current_group_info());
470 #if defined(STRUCT_KEY_TYPE_HAS_PREPARSE)
471 if (prep->datalen != sizeof(afs_uint32) || !prep->data)
473 if (datalen != sizeof(afs_uint32) || !data)
477 /* ensure key being set matches current pag */
478 pag = afs_linux_pag_from_groups(current_group_info());
483 #if defined(STRUCT_KEY_TYPE_HAS_PREPARSE)
484 userpag = (afs_uint32 *)prep->data;
486 userpag = (afs_uint32 *)data;
491 key->payload.value = (unsigned long) *userpag;
492 key->datalen = sizeof(afs_uint32);
496 put_group_info(current_group_info());
500 static int afs_pag_match(const struct key *key, const void *description)
502 return strcmp(key->description, description) == 0;
505 static void afs_pag_destroy(struct key *key)
507 afs_uint32 pag = key->payload.value;
508 int locked = ISAFS_GLOCK();
513 afs_MarkUserExpired(pag);
519 struct key_type key_type_afs_pag =
522 .describe = afs_pag_describe,
523 #if defined(STRUCT_KEY_TYPE_HAS_INSTANTIATE_PREP)
524 .instantiate_prep = afs_pag_instantiate,
527 .instantiate = afs_pag_instantiate,
529 .match = afs_pag_match,
530 .destroy = afs_pag_destroy,
533 #ifdef EXPORTED_TASKLIST_LOCK
534 extern rwlock_t tasklist_lock __attribute__((weak));
537 void osi_keyring_init(void)
539 #if !defined(EXPORTED_KEY_TYPE_KEYRING)
540 struct task_struct *p;
542 /* If we can't lock the tasklist, either with its explicit lock,
543 * or by using the RCU lock, then we can't safely work out the
544 * type of a keyring. So, we have to rely on the weak reference.
545 * If that's not available, then keyring based PAGs won't work.
548 #if defined(EXPORTED_TASKLIST_LOCK) || (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16) && defined(HAVE_LINUX_RCU_READ_LOCK))
549 if (__key_type_keyring == NULL) {
550 # ifdef EXPORTED_TASKLIST_LOCK
552 read_lock(&tasklist_lock);
554 # if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16) && defined(HAVE_LINUX_RCU_READ_LOCK))
555 # ifdef EXPORTED_TASKLIST_LOCK
560 #if defined(HAVE_LINUX_FIND_TASK_BY_PID)
561 p = find_task_by_pid(1);
563 p = find_task_by_vpid(1);
565 if (p && task_user(p)->session_keyring)
566 __key_type_keyring = task_user(p)->session_keyring->type;
567 # ifdef EXPORTED_TASKLIST_LOCK
569 read_unlock(&tasklist_lock);
571 # if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16) && defined(HAVE_LINUX_RCU_READ_LOCK))
572 # ifdef EXPORTED_TASKLIST_LOCK
581 register_key_type(&key_type_afs_pag);
584 void osi_keyring_shutdown(void)
586 unregister_key_type(&key_type_afs_pag);
590 osi_get_keyring_pag(afs_ucred_t *cred)
594 afs_int32 keyring_pag = NOPAG;
596 if (afs_cr_rgid(cred) != NFSXLATOR_CRED) {
597 key = afs_linux_search_keyring(cred, &key_type_afs_pag);
600 if (key_validate(key) == 0 && key->uid == 0) { /* also verify in the session keyring? */
601 keyring_pag = key->payload.value;
602 /* Only set PAG in groups if needed,
603 * and the creds are from the current process */
604 if (afs_linux_cred_is_current(cred) &&
605 ((keyring_pag >> 24) & 0xff) == 'A' &&
606 keyring_pag != afs_linux_pag_from_groups(current_group_info())) {
607 __setpag(&cred, keyring_pag, &newpag, 0, NULL);
617 void osi_keyring_init(void)
622 void osi_keyring_shutdown(void)