-/* Copyright (C) 1995, 1989, 1998 Transarc Corporation - All rights reserved */
/*
- * (C) COPYRIGHT IBM CORPORATION 1987, 1988
- * LICENSED MATERIALS - PROPERTY OF IBM
+ * Copyright 2000, International Business Machines Corporation and others.
+ * All Rights Reserved.
+ *
+ * This software has been released under the terms of the IBM Public
+ * License. For details, see the LICENSE file in the top-level source
+ * directory or online at http://www.openafs.org/dl/license10.html
*/
+
/*
- * osi_groups.c
- *
* Implements:
* setgroups (syscall)
* setpag
*
*/
-#include "../afs/param.h"
-#include "../afs/sysincludes.h"
-#include "../afs/afsincludes.h"
-#include "../afs/afs_stats.h" /* statistics */
+#include <afsconfig.h>
+#include "afs/param.h"
+#ifdef LINUX_KEYRING_SUPPORT
+#include <linux/seq_file.h>
+#endif
+
+RCSID
+ ("$Header$");
+
+#include "afs/sysincludes.h"
+#include "afsincludes.h"
+#include "afs/afs_stats.h" /* statistics */
+#include "afs/nfsclient.h"
#ifdef AFS_LINUX22_ENV
-#include "../h/smp_lock.h"
+#include "h/smp_lock.h"
#endif
-static int afs_getgroups(cred_t *cr, gid_t *groups);
-static int afs_setgroups(cred_t **cr, int ngroups, gid_t *gidset, int change_parent);
+#ifdef AFS_LINUX26_ONEGROUP_ENV
+#define NUMPAGGROUPS 1
+#else
+#define NUMPAGGROUPS 2
+#endif
-/* Only propogate the PAG to the parent process. Unix's propogate to
- * all processes sharing the cred.
+#if defined(AFS_LINUX26_ENV)
+static int
+afs_setgroups(cred_t **cr, struct group_info *group_info, int change_parent)
+{
+ struct group_info *old_info;
+
+ AFS_STATCNT(afs_setgroups);
+
+ old_info = (*cr)->cr_group_info;
+ get_group_info(group_info);
+ (*cr)->cr_group_info = group_info;
+ put_group_info(old_info);
+
+ crset(*cr);
+
+#if defined(STRUCT_TASK_STRUCT_HAS_PARENT) && !defined(STRUCT_TASK_HAS_CRED)
+ if (change_parent) {
+ old_info = current->parent->group_info;
+ get_group_info(group_info);
+ current->parent->group_info = group_info;
+ put_group_info(old_info);
+ }
+#endif
+
+ return (0);
+}
+#else
+static int
+afs_setgroups(cred_t **cr, int ngroups, gid_t * gidset, int change_parent)
+{
+ int ngrps;
+ int i;
+ gid_t *gp;
+
+ AFS_STATCNT(afs_setgroups);
+
+ if (ngroups > NGROUPS)
+ return EINVAL;
+
+ gp = (*cr)->cr_groups;
+ if (ngroups < NGROUPS)
+ gp[ngroups] = (gid_t) NOGROUP;
+
+ for (i = ngroups; i > 0; i--) {
+ *gp++ = *gidset++;
+ }
+
+ (*cr)->cr_ngroups = ngroups;
+ crset(*cr);
+ return (0);
+}
+#endif
+
+#if defined(AFS_LINUX26_ENV)
+static struct group_info *
+afs_getgroups(cred_t * cr)
+{
+ AFS_STATCNT(afs_getgroups);
+
+ get_group_info(cr->cr_group_info);
+ return cr->cr_group_info;
+}
+#else
+/* Returns number of groups. And we trust groups to be large enough to
+ * hold all the groups.
*/
-int set_pag_in_parent(int pag, int g0, int g1)
+static int
+afs_getgroups(cred_t *cr, gid_t *groups)
{
- gid_t *gp = current->p_pptr->groups;
- int ngroups;
int i;
+ int n;
+ gid_t *gp;
-
- ngroups = current->p_pptr->ngroups;
- gp = current->p_pptr->groups;
+ AFS_STATCNT(afs_getgroups);
+
+ gp = cr->cr_groups;
+ n = cr->cr_ngroups;
+ for (i = 0; (i < n) && (*gp != (gid_t) NOGROUP); i++)
+ *groups++ = *gp++;
+ return i;
+}
+#endif
+
+#if !defined(AFS_LINUX26_ENV)
+/* Only propogate the PAG to the parent process. Unix's propogate to
+ * all processes sharing the cred.
+ */
+int
+set_pag_in_parent(int pag, int g0, int g1)
+{
+ int i;
+#ifdef STRUCT_TASK_STRUCT_HAS_PARENT
+ gid_t *gp = current->parent->groups;
+ int ngroups = current->parent->ngroups;
+#else
+ gid_t *gp = current->p_pptr->groups;
+ int ngroups = current->p_pptr->ngroups;
+#endif
- if (afs_get_pag_from_groups(gp[0], gp[1]) == NOPAG) {
+ if ((ngroups < 2) || (afs_get_pag_from_groups(gp[0], gp[1]) == NOPAG)) {
/* We will have to shift grouplist to make room for pag */
if (ngroups + 2 > NGROUPS) {
return EINVAL;
}
- for (i = ngroups-1; i >= 0; i--) {
- gp[i+2] = gp[i];
- }
+ for (i = ngroups - 1; i >= 0; i--) {
+ gp[i + 2] = gp[i];
+ }
ngroups += 2;
}
gp[0] = g0;
if (ngroups < NGROUPS)
gp[ngroups] = NOGROUP;
+#ifdef STRUCT_TASK_STRUCT_HAS_PARENT
+ current->parent->ngroups = ngroups;
+#else
current->p_pptr->ngroups = ngroups;
+#endif
return 0;
}
+#endif
-int setpag(cred_t **cr, afs_uint32 pagvalue, afs_uint32 *newpag, int change_parent)
+#if defined(AFS_LINUX26_ENV)
+int
+__setpag(cred_t **cr, afs_uint32 pagvalue, afs_uint32 *newpag,
+ int change_parent)
+{
+ struct group_info *group_info;
+#ifndef AFS_LINUX26_ONEGROUP_ENV
+ gid_t g0, g1;
+#endif
+ struct group_info *tmp;
+ int i;
+#ifdef AFS_LINUX26_ONEGROUP_ENV
+ int j;
+#endif
+ int need_space = 0;
+
+ group_info = afs_getgroups(*cr);
+ if (group_info->ngroups < NUMPAGGROUPS
+ || afs_get_pag_from_groups(
+#ifdef AFS_LINUX26_ONEGROUP_ENV
+ group_info
+#else
+ GROUP_AT(group_info, 0) ,GROUP_AT(group_info, 1)
+#endif
+ ) == NOPAG)
+ /* We will have to make sure group_info is big enough for pag */
+ need_space = NUMPAGGROUPS;
+
+ tmp = groups_alloc(group_info->ngroups + need_space);
+
+ *newpag = (pagvalue == -1 ? genpag() : pagvalue);
+#ifdef AFS_LINUX26_ONEGROUP_ENV
+ for (i = 0, j = 0; i < group_info->ngroups; ++i) {
+ int ths = GROUP_AT(group_info, i);
+ int last = i > 0 ? GROUP_AT(group_info, i-1) : 0;
+ if ((ths >> 24) == 'A')
+ continue;
+ if (last <= *newpag && ths > *newpag) {
+ GROUP_AT(tmp, j) = *newpag;
+ j++;
+ }
+ GROUP_AT(tmp, j) = ths;
+ j++;
+ }
+ if (j != i + need_space)
+ GROUP_AT(tmp, j) = *newpag;
+#else
+ for (i = 0; i < group_info->ngroups; ++i)
+ GROUP_AT(tmp, i + need_space) = GROUP_AT(group_info, i);
+#endif
+ put_group_info(group_info);
+ group_info = tmp;
+
+#ifndef AFS_LINUX26_ONEGROUP_ENV
+ afs_get_groups_from_pag(*newpag, &g0, &g1);
+ GROUP_AT(group_info, 0) = g0;
+ GROUP_AT(group_info, 1) = g1;
+#endif
+
+ afs_setgroups(cr, group_info, change_parent);
+
+ put_group_info(group_info);
+
+ return 0;
+}
+
+#ifdef LINUX_KEYRING_SUPPORT
+extern struct key_type key_type_keyring __attribute__((weak));
+static struct key_type *__key_type_keyring = &key_type_keyring;
+
+static int
+install_session_keyring(struct task_struct *task, struct key *keyring)
+{
+ struct key *old;
+ char desc[20];
+ unsigned long not_in_quota;
+ int code = -EINVAL;
+
+ if (!__key_type_keyring)
+ return code;
+
+ if (!keyring) {
+
+ /* create an empty session keyring */
+ not_in_quota = KEY_ALLOC_IN_QUOTA;
+ sprintf(desc, "_ses.%u", task->tgid);
+
+#ifdef KEY_ALLOC_NEEDS_STRUCT_TASK
+ keyring = key_alloc(__key_type_keyring, desc,
+ task_uid(task), task_gid(task), task,
+ (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_ALL,
+ not_in_quota);
+#else
+ keyring = key_alloc(__key_type_keyring, desc,
+ task_uid(task), task_gid(task),
+ (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_ALL,
+ not_in_quota);
+#endif
+ if (IS_ERR(keyring)) {
+ code = PTR_ERR(keyring);
+ goto out;
+ }
+ }
+
+ code = key_instantiate_and_link(keyring, NULL, 0, NULL, NULL);
+ if (code < 0) {
+ key_put(keyring);
+ goto out;
+ }
+
+ /* install the keyring */
+ spin_lock_irq(&task->sighand->siglock);
+ old = task_session_keyring(task);
+ smp_wmb();
+ task_session_keyring(task) = keyring;
+ spin_unlock_irq(&task->sighand->siglock);
+
+ if (old)
+ key_put(old);
+
+out:
+ return code;
+}
+#endif /* LINUX_KEYRING_SUPPORT */
+
+#else
+int
+__setpag(cred_t **cr, afs_uint32 pagvalue, afs_uint32 *newpag,
+ int change_parent)
{
gid_t *gidset;
afs_int32 ngroups, code = 0;
int j;
- AFS_STATCNT(setpag);
-
- gidset = (gid_t *) osi_Alloc(NGROUPS*sizeof(gidset[0]));
+ gidset = (gid_t *) osi_Alloc(NGROUPS * sizeof(gidset[0]));
ngroups = afs_getgroups(*cr, gidset);
if (afs_get_pag_from_groups(gidset[0], gidset[1]) == NOPAG) {
/* We will have to shift grouplist to make room for pag */
if (ngroups + 2 > NGROUPS) {
- osi_Free((char *)gidset, NGROUPS*sizeof(int));
+ osi_Free((char *)gidset, NGROUPS * sizeof(int));
return EINVAL;
}
for (j = ngroups - 1; j >= 0; j--) {
- gidset[j+2] = gidset[j];
- }
+ gidset[j + 2] = gidset[j];
+ }
ngroups += 2;
}
- *newpag = (pagvalue == -1 ? genpag(): pagvalue);
+ *newpag = (pagvalue == -1 ? genpag() : pagvalue);
afs_get_groups_from_pag(*newpag, &gidset[0], &gidset[1]);
code = afs_setgroups(cr, ngroups, gidset, change_parent);
code = set_pag_in_parent(*newpag, gidset[0], gidset[1]);
}
- osi_Free((char *)gidset, NGROUPS*sizeof(int));
+ osi_Free((char *)gidset, NGROUPS * sizeof(int));
return code;
}
+#endif
-/* Intercept the standard system call. */
-extern int (*sys_setgroupsp)(int gidsetsize, gid_t *grouplist);
-asmlinkage int afs_xsetgroups(int gidsetsize, gid_t *grouplist)
+int
+setpag(cred_t **cr, afs_uint32 pagvalue, afs_uint32 *newpag,
+ int change_parent)
{
int code;
+
+ AFS_STATCNT(setpag);
+
+ code = __setpag(cr, pagvalue, newpag, change_parent);
+
+#ifdef LINUX_KEYRING_SUPPORT
+ if (code == 0 && (*cr)->cr_rgid != NFSXLATOR_CRED) {
+ (void) install_session_keyring(current, NULL);
+
+ if (current_session_keyring()) {
+ struct key *key;
+ key_perm_t perm;
+
+ perm = KEY_POS_VIEW | KEY_POS_SEARCH;
+ perm |= KEY_USR_VIEW | KEY_USR_SEARCH;
+
+#ifdef KEY_ALLOC_NEEDS_STRUCT_TASK
+ key = key_alloc(&key_type_afs_pag, "_pag", 0, 0, current, perm, 1);
+#else
+ key = key_alloc(&key_type_afs_pag, "_pag", 0, 0, perm, 1);
+#endif
+
+ if (!IS_ERR(key)) {
+ key_instantiate_and_link(key, (void *) newpag, sizeof(afs_uint32),
+ current_session_keyring(), NULL);
+ key_put(key);
+ }
+ }
+ }
+#endif /* LINUX_KEYRING_SUPPORT */
+
+ return code;
+}
+
+
+/* Intercept the standard system call. */
+extern asmlinkage long (*sys_setgroupsp) (int gidsetsize, gid_t * grouplist);
+asmlinkage long
+afs_xsetgroups(int gidsetsize, gid_t * grouplist)
+{
+ long code;
cred_t *cr = crref();
- int junk;
+ afs_uint32 junk;
int old_pag;
lock_kernel();
crfree(cr);
unlock_kernel();
- code = (*sys_setgroupsp)(gidsetsize, grouplist);
+ code = (*sys_setgroupsp) (gidsetsize, grouplist);
if (code) {
return code;
}
cr = crref();
if (old_pag != NOPAG && PagInCred(cr) == NOPAG) {
/* re-install old pag if there's room. */
- code = setpag(&cr, old_pag, &junk, 0);
+ code = __setpag(&cr, old_pag, &junk, 0);
}
crfree(cr);
unlock_kernel();
- return code;
+ /* Linux syscall ABI returns errno as negative */
+ return (-code);
}
-static int afs_setgroups(cred_t **cr, int ngroups, gid_t *gidset, int change_parent)
+#if defined(AFS_LINUX24_ENV)
+/* Intercept the standard uid32 system call. */
+extern asmlinkage long (*sys_setgroups32p) (int gidsetsize, gid_t * grouplist);
+asmlinkage long
+afs_xsetgroups32(int gidsetsize, gid_t * grouplist)
{
- int ngrps;
- int i;
- gid_t *gp;
+ long code;
+ cred_t *cr = crref();
+ afs_uint32 junk;
+ int old_pag;
- AFS_STATCNT(afs_setgroups);
+ lock_kernel();
+ old_pag = PagInCred(cr);
+ crfree(cr);
+ unlock_kernel();
- if (ngroups > NGROUPS)
- return EINVAL;
+ code = (*sys_setgroups32p) (gidsetsize, grouplist);
- gp = (*cr)->cr_groups;
- if (ngroups < NGROUPS)
- gp[ngroups] = (gid_t)NOGROUP;
+ if (code) {
+ return code;
+ }
- for (i = ngroups; i > 0; i--) {
- *gp++ = *gidset++;
+ lock_kernel();
+ cr = crref();
+ if (old_pag != NOPAG && PagInCred(cr) == NOPAG) {
+ /* re-install old pag if there's room. */
+ code = __setpag(&cr, old_pag, &junk, 0);
}
+ crfree(cr);
+ unlock_kernel();
- (*cr)->cr_ngroups = ngroups;
- crset(*cr);
- return (0);
+ /* Linux syscall ABI returns errno as negative */
+ return (-code);
}
+#endif
-/* Returns number of groups. And we trust groups to be large enough to
- * hold all the groups.
- */
-static int afs_getgroups(cred_t *cr, gid_t *groups)
+#if defined(AFS_PPC64_LINUX20_ENV)
+/* Intercept the uid16 system call as used by 32bit programs. */
+extern long (*sys32_setgroupsp)(int gidsetsize, gid_t *grouplist);
+asmlinkage long afs32_xsetgroups(int gidsetsize, gid_t *grouplist)
{
- int i;
- gid_t *gp = cr->cr_groups;
- int n = cr->cr_ngroups;
- AFS_STATCNT(afs_getgroups);
+ long code;
+ cred_t *cr = crref();
+ afs_uint32 junk;
+ int old_pag;
+
+ lock_kernel();
+ old_pag = PagInCred(cr);
+ crfree(cr);
+ unlock_kernel();
+
+ code = (*sys32_setgroupsp)(gidsetsize, grouplist);
+ if (code) {
+ return code;
+ }
+
+ lock_kernel();
+ cr = crref();
+ if (old_pag != NOPAG && PagInCred(cr) == NOPAG) {
+ /* re-install old pag if there's room. */
+ code = __setpag(&cr, old_pag, &junk, 0);
+ }
+ crfree(cr);
+ unlock_kernel();
+
+ /* Linux syscall ABI returns errno as negative */
+ return (-code);
+}
+#endif
- for (i = 0; (i < n) && (*gp != (gid_t)NOGROUP); i++) {
- *groups++ = *gp++;
+#if defined(AFS_SPARC64_LINUX20_ENV) || defined(AFS_AMD64_LINUX20_ENV)
+/* Intercept the uid16 system call as used by 32bit programs. */
+extern long (*sys32_setgroupsp) (int gidsetsize, u16 * grouplist);
+asmlinkage long
+afs32_xsetgroups(int gidsetsize, u16 * grouplist)
+{
+ long code;
+ cred_t *cr = crref();
+ afs_uint32 junk;
+ int old_pag;
+
+ lock_kernel();
+ old_pag = PagInCred(cr);
+ crfree(cr);
+ unlock_kernel();
+
+ code = (*sys32_setgroupsp) (gidsetsize, grouplist);
+ if (code) {
+ return code;
}
- return i;
+
+ lock_kernel();
+ cr = crref();
+ if (old_pag != NOPAG && PagInCred(cr) == NOPAG) {
+ /* re-install old pag if there's room. */
+ code = __setpag(&cr, old_pag, &junk, 0);
+ }
+ crfree(cr);
+ unlock_kernel();
+
+ /* Linux syscall ABI returns errno as negative */
+ return (-code);
}
+#ifdef AFS_LINUX24_ENV
+/* Intercept the uid32 system call as used by 32bit programs. */
+extern long (*sys32_setgroups32p) (int gidsetsize, gid_t * grouplist);
+asmlinkage long
+afs32_xsetgroups32(int gidsetsize, gid_t * grouplist)
+{
+ long code;
+ cred_t *cr = crref();
+ afs_uint32 junk;
+ int old_pag;
+
+ lock_kernel();
+ old_pag = PagInCred(cr);
+ crfree(cr);
+ unlock_kernel();
+
+ code = (*sys32_setgroups32p) (gidsetsize, grouplist);
+ if (code) {
+ return code;
+ }
+
+ lock_kernel();
+ cr = crref();
+ if (old_pag != NOPAG && PagInCred(cr) == NOPAG) {
+ /* re-install old pag if there's room. */
+ code = __setpag(&cr, old_pag, &junk, 0);
+ }
+ crfree(cr);
+ unlock_kernel();
+
+ /* Linux syscall ABI returns errno as negative */
+ return (-code);
+}
+#endif
+#endif
+
+
+#ifdef LINUX_KEYRING_SUPPORT
+static void afs_pag_describe(const struct key *key, struct seq_file *m)
+{
+ seq_puts(m, key->description);
+
+ seq_printf(m, ": %u", key->datalen);
+}
+
+static int afs_pag_instantiate(struct key *key, const void *data, size_t datalen)
+{
+ int code;
+ afs_uint32 *userpag, pag = NOPAG;
+#ifndef AFS_LINUX26_ONEGROUP_ENV
+ int g0, g1;
+#endif
+
+ if (key->uid != 0 || key->gid != 0)
+ return -EPERM;
+
+ code = -EINVAL;
+ get_group_info(current_group_info());
+
+ if (datalen != sizeof(afs_uint32) || !data)
+ goto error;
+
+ if (current_group_info()->ngroups < NUMPAGGROUPS)
+ goto error;
+
+ /* ensure key being set matches current pag */
+#ifdef AFS_LINUX26_ONEGROUP_ENV
+ pag = afs_get_pag_from_groups(current_group_info());
+#else
+ g0 = GROUP_AT(current_group_info(), 0);
+ g1 = GROUP_AT(current_group_info(), 1);
+
+ pag = afs_get_pag_from_groups(g0, g1);
+#endif
+ if (pag == NOPAG)
+ goto error;
+
+ userpag = (afs_uint32 *) data;
+ if (*userpag != pag)
+ goto error;
+
+ key->payload.value = (unsigned long) *userpag;
+ key->datalen = sizeof(afs_uint32);
+ code = 0;
+
+error:
+ put_group_info(current_group_info());
+ return code;
+}
+
+static int afs_pag_match(const struct key *key, const void *description)
+{
+ return strcmp(key->description, description) == 0;
+}
+
+static void afs_pag_destroy(struct key *key)
+{
+ afs_uint32 pag = key->payload.value;
+ struct unixuser *pu;
+ int locked = ISAFS_GLOCK();
+
+ if (!locked)
+ AFS_GLOCK();
+ pu = afs_FindUser(pag, -1, READ_LOCK);
+ if (pu) {
+ pu->ct.EndTimestamp = 0;
+ pu->tokenTime = 0;
+ afs_PutUser(pu, READ_LOCK);
+ }
+ if (!locked)
+ AFS_GUNLOCK();
+}
+
+struct key_type key_type_afs_pag =
+{
+ .name = "afs_pag",
+ .describe = afs_pag_describe,
+ .instantiate = afs_pag_instantiate,
+ .match = afs_pag_match,
+ .destroy = afs_pag_destroy,
+};
+
+#ifdef EXPORTED_TASKLIST_LOCK
+extern rwlock_t tasklist_lock __attribute__((weak));
+#endif
+
+void osi_keyring_init(void)
+{
+ struct task_struct *p;
+
+ /* If we can't lock the tasklist, either with its explicit lock,
+ * or by using the RCU lock, then we can't safely work out the
+ * type of a keyring. So, we have to rely on the weak reference.
+ * If that's not available, then keyring based PAGs won't work.
+ */
+
+#if defined(EXPORTED_TASKLIST_LOCK) || (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16) && defined(EXPORTED_RCU_READ_LOCK))
+ if (__key_type_keyring == NULL) {
+# ifdef EXPORTED_TASKLIST_LOCK
+ if (&tasklist_lock)
+ read_lock(&tasklist_lock);
+# endif
+# if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16) && defined(EXPORTED_RCU_READ_LOCK))
+# ifdef EXPORTED_TASKLIST_LOCK
+ else
+# endif
+ rcu_read_lock();
+# endif
+#if defined(EXPORTED_FIND_TASK_BY_PID)
+ p = find_task_by_pid(1);
+#else
+ p = find_task_by_vpid(1);
+#endif
+ if (p && task_user(p)->session_keyring)
+ __key_type_keyring = task_user(p)->session_keyring->type;
+# ifdef EXPORTED_TASKLIST_LOCK
+ if (&tasklist_lock)
+ read_unlock(&tasklist_lock);
+# endif
+# if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16) && defined(EXPORTED_RCU_READ_LOCK))
+# ifdef EXPORTED_TASKLIST_LOCK
+ else
+# endif
+ rcu_read_unlock();
+# endif
+ }
+#endif
+
+ register_key_type(&key_type_afs_pag);
+}
+
+void osi_keyring_shutdown(void)
+{
+ unregister_key_type(&key_type_afs_pag);
+}
+
+#else
+void osi_keyring_init(void)
+{
+ return;
+}
+
+void osi_keyring_shutdown(void)
+{
+ return;
+}
+#endif
git://git.openafs.org / openafs.git / blobdiff