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>
25 #include "afs/sysincludes.h"
26 #include "afsincludes.h"
27 #include "afs/afs_stats.h" /* statistics */
28 #ifdef AFS_LINUX22_ENV
29 #include "h/smp_lock.h"
32 #if defined(AFS_LINUX26_ENV)
34 afs_setgroups(cred_t **cr, struct group_info *group_info, int change_parent)
36 struct group_info *old_info;
38 AFS_STATCNT(afs_setgroups);
40 old_info = (*cr)->cr_group_info;
41 get_group_info(group_info);
42 (*cr)->cr_group_info = group_info;
43 put_group_info(old_info);
48 old_info = current->parent->group_info;
49 get_group_info(group_info);
50 current->parent->group_info = group_info;
51 put_group_info(old_info);
58 afs_setgroups(cred_t **cr, int ngroups, gid_t * gidset, int change_parent)
64 AFS_STATCNT(afs_setgroups);
66 if (ngroups > NGROUPS)
69 gp = (*cr)->cr_groups;
70 if (ngroups < NGROUPS)
71 gp[ngroups] = (gid_t) NOGROUP;
73 for (i = ngroups; i > 0; i--) {
77 (*cr)->cr_ngroups = ngroups;
83 #if defined(AFS_LINUX26_ENV)
84 static struct group_info *
85 afs_getgroups(cred_t * cr)
87 AFS_STATCNT(afs_getgroups);
89 get_group_info(cr->cr_group_info);
90 return cr->cr_group_info;
93 /* Returns number of groups. And we trust groups to be large enough to
94 * hold all the groups.
97 afs_getgroups(cred_t *cr, gid_t *groups)
103 AFS_STATCNT(afs_getgroups);
108 for (i = 0; (i < n) && (*gp != (gid_t) NOGROUP); i++)
114 #if !defined(AFS_LINUX26_ENV)
115 /* Only propogate the PAG to the parent process. Unix's propogate to
116 * all processes sharing the cred.
119 set_pag_in_parent(int pag, int g0, int g1)
122 #ifdef STRUCT_TASK_STRUCT_HAS_PARENT
123 gid_t *gp = current->parent->groups;
124 int ngroups = current->parent->ngroups;
126 gid_t *gp = current->p_pptr->groups;
127 int ngroups = current->p_pptr->ngroups;
130 if ((ngroups < 2) || (afs_get_pag_from_groups(gp[0], gp[1]) == NOPAG)) {
131 /* We will have to shift grouplist to make room for pag */
132 if (ngroups + 2 > NGROUPS) {
135 for (i = ngroups - 1; i >= 0; i--) {
142 if (ngroups < NGROUPS)
143 gp[ngroups] = NOGROUP;
145 #ifdef STRUCT_TASK_STRUCT_HAS_PARENT
146 current->parent->ngroups = ngroups;
148 current->p_pptr->ngroups = ngroups;
154 #if defined(AFS_LINUX26_ENV)
156 __setpag(cred_t **cr, afs_uint32 pagvalue, afs_uint32 *newpag,
159 struct group_info *group_info;
161 struct group_info *tmp;
165 group_info = afs_getgroups(*cr);
166 if (group_info->ngroups < 2
167 || afs_get_pag_from_groups(GROUP_AT(group_info, 0),
168 GROUP_AT(group_info, 1)) == NOPAG)
169 /* We will have to make sure group_info is big enough for pag */
172 tmp = groups_alloc(group_info->ngroups + need_space);
174 for (i = 0; i < group_info->ngroups; ++i)
175 GROUP_AT(tmp, i + need_space) = GROUP_AT(group_info, i);
176 put_group_info(group_info);
179 *newpag = (pagvalue == -1 ? genpag() : pagvalue);
180 afs_get_groups_from_pag(*newpag, &g0, &g1);
181 GROUP_AT(group_info, 0) = g0;
182 GROUP_AT(group_info, 1) = g1;
184 afs_setgroups(cr, group_info, change_parent);
186 put_group_info(group_info);
191 #ifdef LINUX_KEYRING_SUPPORT
192 static struct key_type *__key_type_keyring;
195 install_session_keyring(struct task_struct *task, struct key *keyring)
199 unsigned long not_in_quota;
202 if (!__key_type_keyring)
207 /* create an empty session keyring */
208 not_in_quota = KEY_ALLOC_IN_QUOTA;
209 sprintf(desc, "_ses.%u", task->tgid);
211 #ifdef KEY_ALLOC_NEEDS_STRUCT_TASK
212 keyring = key_alloc(__key_type_keyring, desc,
213 task->uid, task->gid, task,
214 (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_ALL,
217 keyring = key_alloc(__key_type_keyring, desc,
218 task->uid, task->gid,
219 (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_ALL,
222 if (IS_ERR(keyring)) {
223 code = PTR_ERR(keyring);
228 code = key_instantiate_and_link(keyring, NULL, 0, NULL, NULL);
234 /* install the keyring */
235 spin_lock_irq(&task->sighand->siglock);
236 old = task->signal->session_keyring;
238 task->signal->session_keyring = keyring;
239 spin_unlock_irq(&task->sighand->siglock);
247 #endif /* LINUX_KEYRING_SUPPORT */
251 __setpag(cred_t **cr, afs_uint32 pagvalue, afs_uint32 *newpag,
255 afs_int32 ngroups, code = 0;
258 gidset = (gid_t *) osi_Alloc(NGROUPS * sizeof(gidset[0]));
259 ngroups = afs_getgroups(*cr, gidset);
261 if (afs_get_pag_from_groups(gidset[0], gidset[1]) == NOPAG) {
262 /* We will have to shift grouplist to make room for pag */
263 if (ngroups + 2 > NGROUPS) {
264 osi_Free((char *)gidset, NGROUPS * sizeof(int));
267 for (j = ngroups - 1; j >= 0; j--) {
268 gidset[j + 2] = gidset[j];
272 *newpag = (pagvalue == -1 ? genpag() : pagvalue);
273 afs_get_groups_from_pag(*newpag, &gidset[0], &gidset[1]);
274 code = afs_setgroups(cr, ngroups, gidset, change_parent);
276 /* If change_parent is set, then we should set the pag in the parent as
279 if (change_parent && !code) {
280 code = set_pag_in_parent(*newpag, gidset[0], gidset[1]);
283 osi_Free((char *)gidset, NGROUPS * sizeof(int));
290 setpag(cred_t **cr, afs_uint32 pagvalue, afs_uint32 *newpag,
297 code = __setpag(cr, pagvalue, newpag, change_parent);
299 #ifdef LINUX_KEYRING_SUPPORT
302 (void) install_session_keyring(current, NULL);
304 if (current->signal->session_keyring) {
308 perm = KEY_POS_VIEW | KEY_POS_SEARCH;
309 perm |= KEY_USR_VIEW | KEY_USR_SEARCH;
311 #ifdef KEY_ALLOC_NEEDS_STRUCT_TASK
312 key = key_alloc(&key_type_afs_pag, "_pag", 0, 0, current, perm, 1);
314 key = key_alloc(&key_type_afs_pag, "_pag", 0, 0, perm, 1);
318 key_instantiate_and_link(key, (void *) newpag, sizeof(afs_uint32),
319 current->signal->session_keyring, NULL);
324 #endif /* LINUX_KEYRING_SUPPORT */
330 /* Intercept the standard system call. */
331 extern asmlinkage long (*sys_setgroupsp) (int gidsetsize, gid_t * grouplist);
333 afs_xsetgroups(int gidsetsize, gid_t * grouplist)
336 cred_t *cr = crref();
341 old_pag = PagInCred(cr);
345 code = (*sys_setgroupsp) (gidsetsize, grouplist);
352 if (old_pag != NOPAG && PagInCred(cr) == NOPAG) {
353 /* re-install old pag if there's room. */
354 code = __setpag(&cr, old_pag, &junk, 0);
359 /* Linux syscall ABI returns errno as negative */
363 #if defined(AFS_LINUX24_ENV)
364 /* Intercept the standard uid32 system call. */
365 extern asmlinkage long (*sys_setgroups32p) (int gidsetsize, gid_t * grouplist);
367 afs_xsetgroups32(int gidsetsize, gid_t * grouplist)
370 cred_t *cr = crref();
375 old_pag = PagInCred(cr);
379 code = (*sys_setgroups32p) (gidsetsize, grouplist);
387 if (old_pag != NOPAG && PagInCred(cr) == NOPAG) {
388 /* re-install old pag if there's room. */
389 code = __setpag(&cr, old_pag, &junk, 0);
394 /* Linux syscall ABI returns errno as negative */
399 #if defined(AFS_PPC64_LINUX20_ENV)
400 /* Intercept the uid16 system call as used by 32bit programs. */
401 extern long (*sys32_setgroupsp)(int gidsetsize, gid_t *grouplist);
402 asmlinkage long afs32_xsetgroups(int gidsetsize, gid_t *grouplist)
405 cred_t *cr = crref();
410 old_pag = PagInCred(cr);
414 code = (*sys32_setgroupsp)(gidsetsize, grouplist);
421 if (old_pag != NOPAG && PagInCred(cr) == NOPAG) {
422 /* re-install old pag if there's room. */
423 code = __setpag(&cr, old_pag, &junk, 0);
428 /* Linux syscall ABI returns errno as negative */
433 #if defined(AFS_SPARC64_LINUX20_ENV) || defined(AFS_AMD64_LINUX20_ENV)
434 /* Intercept the uid16 system call as used by 32bit programs. */
435 extern long (*sys32_setgroupsp) (int gidsetsize, u16 * grouplist);
437 afs32_xsetgroups(int gidsetsize, u16 * grouplist)
440 cred_t *cr = crref();
445 old_pag = PagInCred(cr);
449 code = (*sys32_setgroupsp) (gidsetsize, grouplist);
456 if (old_pag != NOPAG && PagInCred(cr) == NOPAG) {
457 /* re-install old pag if there's room. */
458 code = __setpag(&cr, old_pag, &junk, 0);
463 /* Linux syscall ABI returns errno as negative */
467 #ifdef AFS_LINUX24_ENV
468 /* Intercept the uid32 system call as used by 32bit programs. */
469 extern long (*sys32_setgroups32p) (int gidsetsize, gid_t * grouplist);
471 afs32_xsetgroups32(int gidsetsize, gid_t * grouplist)
474 cred_t *cr = crref();
479 old_pag = PagInCred(cr);
483 code = (*sys32_setgroups32p) (gidsetsize, grouplist);
490 if (old_pag != NOPAG && PagInCred(cr) == NOPAG) {
491 /* re-install old pag if there's room. */
492 code = __setpag(&cr, old_pag, &junk, 0);
497 /* Linux syscall ABI returns errno as negative */
504 #ifdef LINUX_KEYRING_SUPPORT
505 static void afs_pag_describe(const struct key *key, struct seq_file *m)
507 seq_puts(m, key->description);
509 seq_printf(m, ": %u", key->datalen);
512 static int afs_pag_instantiate(struct key *key, const void *data, size_t datalen)
515 afs_uint32 *userpag, pag = NOPAG;
518 if (key->uid != 0 || key->gid != 0)
522 get_group_info(current->group_info);
524 if (datalen != sizeof(afs_uint32) || !data)
527 if (current->group_info->ngroups < 2)
530 /* ensure key being set matches current pag */
532 g0 = GROUP_AT(current->group_info, 0);
533 g1 = GROUP_AT(current->group_info, 1);
535 pag = afs_get_pag_from_groups(g0, g1);
539 userpag = (afs_uint32 *) data;
543 key->payload.value = (unsigned long) *userpag;
544 key->datalen = sizeof(afs_uint32);
548 put_group_info(current->group_info);
552 static int afs_pag_match(const struct key *key, const void *description)
554 return strcmp(key->description, description) == 0;
557 static void afs_pag_destroy(struct key *key)
559 afs_uint32 pag = key->payload.value;
562 pu = afs_FindUser(pag, -1, READ_LOCK);
564 pu->ct.EndTimestamp = 0;
566 afs_PutUser(pu, READ_LOCK);
570 struct key_type key_type_afs_pag =
573 .describe = afs_pag_describe,
574 .instantiate = afs_pag_instantiate,
575 .match = afs_pag_match,
576 .destroy = afs_pag_destroy,
579 void osi_keyring_init(void)
581 struct task_struct *p;
583 p = find_task_by_pid(1);
584 if (p && p->user->session_keyring)
585 __key_type_keyring = p->user->session_keyring->type;
587 register_key_type(&key_type_afs_pag);
590 void osi_keyring_shutdown(void)
592 unregister_key_type(&key_type_afs_pag);
596 void osi_keyring_init(void)
601 void osi_keyring_shutdown(void)