#include <linux/seq_file.h>
#endif
-RCSID
- ("$Header$");
#include "afs/sysincludes.h"
#include "afsincludes.h"
#include "afs/afs_stats.h" /* statistics */
-#ifdef AFS_LINUX22_ENV
-#include "h/smp_lock.h"
+#include "afs/nfsclient.h"
+#include <linux/smp_lock.h>
+
+#ifdef AFS_LINUX26_ONEGROUP_ENV
+#define NUMPAGGROUPS 1
+#else
+#define NUMPAGGROUPS 2
#endif
-#if defined(AFS_LINUX26_ENV)
static int
afs_setgroups(cred_t **cr, struct group_info *group_info, int change_parent)
{
AFS_STATCNT(afs_setgroups);
- old_info = (*cr)->cr_group_info;
+ old_info = afs_cr_group_info(*cr);
get_group_info(group_info);
- (*cr)->cr_group_info = group_info;
+ afs_set_cr_group_info(*cr, 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);
}
-
- 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;
+ return (0);
}
-#else
/* 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)
+static struct group_info *
+afs_getgroups(cred_t * cr)
{
- int i;
- int n;
- gid_t *gp;
-
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;
+ get_group_info(afs_cr_group_info(cr));
+ return afs_cr_group_info(cr);
}
-#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 ((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];
- }
- ngroups += 2;
- }
- gp[0] = g0;
- gp[1] = g1;
- 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
-
-#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 < 2
- || afs_get_pag_from_groups(GROUP_AT(group_info, 0),
- GROUP_AT(group_info, 1)) == NOPAG)
+ 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 = 2;
+ 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;
- *newpag = (pagvalue == -1 ? genpag() : pagvalue);
+#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);
}
#ifdef LINUX_KEYRING_SUPPORT
-#include <asm/unistd.h>
-#include <linux/keyctl.h>
-
-static int errno;
-static inline _syscall2(long, keyctl, int, option, void*, arg2);
-
-static long
-__join_session_keyring(char *name)
-{
- return keyctl(KEYCTL_JOIN_SESSION_KEYRING, name);
-}
-#endif /* LINUX_KEYRING_SUPPORT */
+extern struct key_type key_type_keyring __attribute__((weak));
+static struct key_type *__key_type_keyring = &key_type_keyring;
-#else
-int
-__setpag(cred_t **cr, afs_uint32 pagvalue, afs_uint32 *newpag,
- int change_parent)
+static int
+install_session_keyring(struct key *keyring)
{
- gid_t *gidset;
- afs_int32 ngroups, code = 0;
- int j;
+ struct key *old;
+ char desc[20];
+ unsigned long not_in_quota;
+ int code = -EINVAL;
- gidset = (gid_t *) osi_Alloc(NGROUPS * sizeof(gidset[0]));
- ngroups = afs_getgroups(*cr, gidset);
+ if (!__key_type_keyring)
+ return code;
- 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));
- return EINVAL;
- }
- for (j = ngroups - 1; j >= 0; j--) {
- gidset[j + 2] = gidset[j];
+ if (!keyring) {
+
+ /* create an empty session keyring */
+ not_in_quota = KEY_ALLOC_IN_QUOTA;
+ sprintf(desc, "_ses.%u", current->tgid);
+
+#if defined(KEY_ALLOC_NEEDS_STRUCT_TASK)
+ keyring = key_alloc(__key_type_keyring, desc,
+ current_uid(), current_gid(), current,
+ (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_ALL,
+ not_in_quota);
+#elif defined(KEY_ALLOC_NEEDS_CRED)
+ keyring = key_alloc(__key_type_keyring, desc,
+ current_uid(), current_gid(), current_cred(),
+ (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_ALL,
+ not_in_quota);
+#else
+ keyring = key_alloc(__key_type_keyring, desc,
+ current_uid(), current_gid(),
+ (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_ALL,
+ not_in_quota);
+#endif
+ if (IS_ERR(keyring)) {
+ code = PTR_ERR(keyring);
+ goto out;
}
- ngroups += 2;
}
- *newpag = (pagvalue == -1 ? genpag() : pagvalue);
- afs_get_groups_from_pag(*newpag, &gidset[0], &gidset[1]);
- code = afs_setgroups(cr, ngroups, gidset, change_parent);
- /* If change_parent is set, then we should set the pag in the parent as
- * well.
- */
- if (change_parent && !code) {
- code = set_pag_in_parent(*newpag, gidset[0], gidset[1]);
+ code = key_instantiate_and_link(keyring, NULL, 0, NULL, NULL);
+ if (code < 0) {
+ key_put(keyring);
+ goto out;
}
- osi_Free((char *)gidset, NGROUPS * sizeof(int));
+ /* install the keyring */
+ spin_lock_irq(¤t->sighand->siglock);
+ old = task_session_keyring(current);
+ smp_wmb();
+ task_session_keyring(current) = keyring;
+ spin_unlock_irq(¤t->sighand->siglock);
+
+ if (old)
+ key_put(old);
+
+out:
return code;
}
-#endif
-
+#endif /* LINUX_KEYRING_SUPPORT */
int
setpag(cred_t **cr, afs_uint32 pagvalue, afs_uint32 *newpag,
code = __setpag(cr, pagvalue, newpag, change_parent);
#ifdef LINUX_KEYRING_SUPPORT
- if (code == 0) {
-
- (void) __join_session_keyring(NULL);
+ if (code == 0 && afs_cr_rgid(*cr) != NFSXLATOR_CRED) {
+ (void) install_session_keyring(NULL);
- if (current->signal->session_keyring) {
+ 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
+#if defined(KEY_ALLOC_NEEDS_STRUCT_TASK)
key = key_alloc(&key_type_afs_pag, "_pag", 0, 0, current, perm, 1);
+#elif defined(KEY_ALLOC_NEEDS_CRED)
+ key = key_alloc(&key_type_afs_pag, "_pag", 0, 0, current_cred(), 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->signal->session_keyring, NULL);
+ current_session_keyring(), NULL);
key_put(key);
}
}
return (-code);
}
-#if defined(AFS_LINUX24_ENV)
/* Intercept the standard uid32 system call. */
extern asmlinkage long (*sys_setgroups32p) (int gidsetsize, gid_t * grouplist);
asmlinkage long
/* Linux syscall ABI returns errno as negative */
return (-code);
}
-#endif
#if defined(AFS_PPC64_LINUX20_ENV)
/* Intercept the uid16 system call as used by 32bit programs. */
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
return (-code);
}
#endif
-#endif
#ifdef LINUX_KEYRING_SUPPORT
{
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);
+ get_group_info(current_group_info());
if (datalen != sizeof(afs_uint32) || !data)
goto error;
- if (current->group_info->ngroups < 2)
+ if (current_group_info()->ngroups < NUMPAGGROUPS)
goto error;
/* ensure key being set matches current pag */
-
- g0 = GROUP_AT(current->group_info, 0);
- g1 = GROUP_AT(current->group_info, 1);
+#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;
code = 0;
error:
- put_group_info(current->group_info);
+ put_group_info(current_group_info());
return code;
}
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)
{
+#if !defined(EXPORTED_KEY_TYPE_KEYRING)
+ 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
+#endif
+
register_key_type(&key_type_afs_pag);
}
unregister_key_type(&key_type_afs_pag);
}
+afs_int32
+osi_get_keyring_pag(afs_ucred_t *cred)
+{
+ struct key *key;
+ afs_uint32 newpag;
+ afs_int32 keyring_pag = NOPAG;
+
+ if (afs_cr_rgid(cred) != NFSXLATOR_CRED) {
+
+#if defined(STRUCT_TASK_HAS_CRED)
+ /* If we have a kernel cred, search the passed credentials */
+ if (cred->tgcred->session_keyring) {
+ key_ref_t key_ref;
+
+ key_ref = keyring_search(
+ make_key_ref(cred->tgcred->session_keyring, 1),
+ &key_type_afs_pag, "_pag");
+ if (IS_ERR(key_ref))
+ key = ERR_CAST(key_ref);
+ else
+ key = key_ref_to_ptr(key_ref);
+ } else {
+ key = ERR_PTR(-ENOKEY);
+ }
+#else
+ /* Search the keyrings of the current process */
+ key = request_key(&key_type_afs_pag, "_pag", NULL);
+#endif
+ if (!IS_ERR(key)) {
+ if (key_validate(key) == 0 && key->uid == 0) { /* also verify in the session keyring? */
+ keyring_pag = key->payload.value;
+ /* Only set PAG in groups if needed, and the creds are from the current process */
+#if defined(STRUCT_TASK_HAS_CRED)
+ if (cred == current_cred() && ((keyring_pag >> 24) & 0xff) == 'A') {
+#else
+ if (((keyring_pag >> 24) & 0xff) == 'A') {
+#endif
+ if (keyring_pag != afs_get_pag_from_groups(current_group_info()))
+ __setpag(&cred, keyring_pag, &newpag, 0);
+ }
+ }
+ key_put(key);
+ }
+ }
+ return keyring_pag;
+}
+
#else
void osi_keyring_init(void)
{
git://git.openafs.org / openafs.git / blobdiff