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-rw-r--r--include/linux/key.h16
-rw-r--r--include/linux/keyctl.h4
-rw-r--r--kernel/kmod.c2
-rw-r--r--security/keys/internal.h12
-rw-r--r--security/keys/keyctl.c118
-rw-r--r--security/keys/process_keys.c88
-rw-r--r--security/keys/request_key.c75
-rw-r--r--security/keys/request_key_auth.c5
8 files changed, 199 insertions, 121 deletions
diff --git a/include/linux/key.h b/include/linux/key.h
index 1b70e35a71e..df709e1af3c 100644
--- a/include/linux/key.h
+++ b/include/linux/key.h
@@ -287,11 +287,11 @@ extern void key_fsuid_changed(struct task_struct *tsk);
extern void key_fsgid_changed(struct task_struct *tsk);
extern void key_init(void);
-#define __install_session_keyring(tsk, keyring) \
-({ \
- struct key *old_session = tsk->signal->session_keyring; \
- tsk->signal->session_keyring = keyring; \
- old_session; \
+#define __install_session_keyring(keyring) \
+({ \
+ struct key *old_session = current->signal->session_keyring; \
+ current->signal->session_keyring = keyring; \
+ old_session; \
})
#else /* CONFIG_KEYS */
@@ -302,11 +302,11 @@ extern void key_init(void);
#define key_revoke(k) do { } while(0)
#define key_put(k) do { } while(0)
#define key_ref_put(k) do { } while(0)
-#define make_key_ref(k, p) ({ NULL; })
-#define key_ref_to_ptr(k) ({ NULL; })
+#define make_key_ref(k, p) NULL
+#define key_ref_to_ptr(k) NULL
#define is_key_possessed(k) 0
#define switch_uid_keyring(u) do { } while(0)
-#define __install_session_keyring(t, k) ({ NULL; })
+#define __install_session_keyring(k) ({ NULL; })
#define copy_keys(f,t) 0
#define copy_thread_group_keys(t) 0
#define exit_keys(t) do { } while(0)
diff --git a/include/linux/keyctl.h b/include/linux/keyctl.h
index 656ee6b77a4..c0688eb7209 100644
--- a/include/linux/keyctl.h
+++ b/include/linux/keyctl.h
@@ -1,6 +1,6 @@
/* keyctl.h: keyctl command IDs
*
- * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+ * Copyright (C) 2004, 2008 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
@@ -20,6 +20,7 @@
#define KEY_SPEC_USER_SESSION_KEYRING -5 /* - key ID for UID-session keyring */
#define KEY_SPEC_GROUP_KEYRING -6 /* - key ID for GID-specific keyring */
#define KEY_SPEC_REQKEY_AUTH_KEY -7 /* - key ID for assumed request_key auth key */
+#define KEY_SPEC_REQUESTOR_KEYRING -8 /* - key ID for request_key() dest keyring */
/* request-key default keyrings */
#define KEY_REQKEY_DEFL_NO_CHANGE -1
@@ -30,6 +31,7 @@
#define KEY_REQKEY_DEFL_USER_KEYRING 4
#define KEY_REQKEY_DEFL_USER_SESSION_KEYRING 5
#define KEY_REQKEY_DEFL_GROUP_KEYRING 6
+#define KEY_REQKEY_DEFL_REQUESTOR_KEYRING 7
/* keyctl commands */
#define KEYCTL_GET_KEYRING_ID 0 /* ask for a keyring's ID */
diff --git a/kernel/kmod.c b/kernel/kmod.c
index 3d3c3ea3a02..f044f8f5770 100644
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -140,7 +140,7 @@ static int ____call_usermodehelper(void *data)
/* Unblock all signals and set the session keyring. */
new_session = key_get(sub_info->ring);
spin_lock_irq(&current->sighand->siglock);
- old_session = __install_session_keyring(current, new_session);
+ old_session = __install_session_keyring(new_session);
flush_signal_handlers(current, 1);
sigemptyset(&current->blocked);
recalc_sigpending();
diff --git a/security/keys/internal.h b/security/keys/internal.h
index a60c68138b4..d1586c62978 100644
--- a/security/keys/internal.h
+++ b/security/keys/internal.h
@@ -109,8 +109,9 @@ extern key_ref_t search_process_keyrings(struct key_type *type,
extern struct key *find_keyring_by_name(const char *name, bool skip_perm_check);
-extern int install_thread_keyring(struct task_struct *tsk);
-extern int install_process_keyring(struct task_struct *tsk);
+extern int install_user_keyrings(void);
+extern int install_thread_keyring(void);
+extern int install_process_keyring(void);
extern struct key *request_key_and_link(struct key_type *type,
const char *description,
@@ -120,8 +121,7 @@ extern struct key *request_key_and_link(struct key_type *type,
struct key *dest_keyring,
unsigned long flags);
-extern key_ref_t lookup_user_key(struct task_struct *context,
- key_serial_t id, int create, int partial,
+extern key_ref_t lookup_user_key(key_serial_t id, int create, int partial,
key_perm_t perm);
extern long join_session_keyring(const char *name);
@@ -152,6 +152,7 @@ static inline int key_permission(const key_ref_t key_ref, key_perm_t perm)
*/
struct request_key_auth {
struct key *target_key;
+ struct key *dest_keyring;
struct task_struct *context;
void *callout_info;
size_t callout_len;
@@ -161,7 +162,8 @@ struct request_key_auth {
extern struct key_type key_type_request_key_auth;
extern struct key *request_key_auth_new(struct key *target,
const void *callout_info,
- size_t callout_len);
+ size_t callout_len,
+ struct key *dest_keyring);
extern struct key *key_get_instantiation_authkey(key_serial_t target_id);
diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index 3f09e5b2a78..fcce331eca7 100644
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -103,7 +103,7 @@ asmlinkage long sys_add_key(const char __user *_type,
}
/* find the target keyring (which must be writable) */
- keyring_ref = lookup_user_key(NULL, ringid, 1, 0, KEY_WRITE);
+ keyring_ref = lookup_user_key(ringid, 1, 0, KEY_WRITE);
if (IS_ERR(keyring_ref)) {
ret = PTR_ERR(keyring_ref);
goto error3;
@@ -185,7 +185,7 @@ asmlinkage long sys_request_key(const char __user *_type,
/* get the destination keyring if specified */
dest_ref = NULL;
if (destringid) {
- dest_ref = lookup_user_key(NULL, destringid, 1, 0, KEY_WRITE);
+ dest_ref = lookup_user_key(destringid, 1, 0, KEY_WRITE);
if (IS_ERR(dest_ref)) {
ret = PTR_ERR(dest_ref);
goto error3;
@@ -235,7 +235,7 @@ long keyctl_get_keyring_ID(key_serial_t id, int create)
key_ref_t key_ref;
long ret;
- key_ref = lookup_user_key(NULL, id, create, 0, KEY_SEARCH);
+ key_ref = lookup_user_key(id, create, 0, KEY_SEARCH);
if (IS_ERR(key_ref)) {
ret = PTR_ERR(key_ref);
goto error;
@@ -308,7 +308,7 @@ long keyctl_update_key(key_serial_t id,
}
/* find the target key (which must be writable) */
- key_ref = lookup_user_key(NULL, id, 0, 0, KEY_WRITE);
+ key_ref = lookup_user_key(id, 0, 0, KEY_WRITE);
if (IS_ERR(key_ref)) {
ret = PTR_ERR(key_ref);
goto error2;
@@ -336,7 +336,7 @@ long keyctl_revoke_key(key_serial_t id)
key_ref_t key_ref;
long ret;
- key_ref = lookup_user_key(NULL, id, 0, 0, KEY_WRITE);
+ key_ref = lookup_user_key(id, 0, 0, KEY_WRITE);
if (IS_ERR(key_ref)) {
ret = PTR_ERR(key_ref);
goto error;
@@ -362,7 +362,7 @@ long keyctl_keyring_clear(key_serial_t ringid)
key_ref_t keyring_ref;
long ret;
- keyring_ref = lookup_user_key(NULL, ringid, 1, 0, KEY_WRITE);
+ keyring_ref = lookup_user_key(ringid, 1, 0, KEY_WRITE);
if (IS_ERR(keyring_ref)) {
ret = PTR_ERR(keyring_ref);
goto error;
@@ -388,13 +388,13 @@ long keyctl_keyring_link(key_serial_t id, key_serial_t ringid)
key_ref_t keyring_ref, key_ref;
long ret;
- keyring_ref = lookup_user_key(NULL, ringid, 1, 0, KEY_WRITE);
+ keyring_ref = lookup_user_key(ringid, 1, 0, KEY_WRITE);
if (IS_ERR(keyring_ref)) {
ret = PTR_ERR(keyring_ref);
goto error;
}
- key_ref = lookup_user_key(NULL, id, 1, 0, KEY_LINK);
+ key_ref = lookup_user_key(id, 1, 0, KEY_LINK);
if (IS_ERR(key_ref)) {
ret = PTR_ERR(key_ref);
goto error2;
@@ -422,13 +422,13 @@ long keyctl_keyring_unlink(key_serial_t id, key_serial_t ringid)
key_ref_t keyring_ref, key_ref;
long ret;
- keyring_ref = lookup_user_key(NULL, ringid, 0, 0, KEY_WRITE);
+ keyring_ref = lookup_user_key(ringid, 0, 0, KEY_WRITE);
if (IS_ERR(keyring_ref)) {
ret = PTR_ERR(keyring_ref);
goto error;
}
- key_ref = lookup_user_key(NULL, id, 0, 0, 0);
+ key_ref = lookup_user_key(id, 0, 0, 0);
if (IS_ERR(key_ref)) {
ret = PTR_ERR(key_ref);
goto error2;
@@ -464,7 +464,7 @@ long keyctl_describe_key(key_serial_t keyid,
char *tmpbuf;
long ret;
- key_ref = lookup_user_key(NULL, keyid, 0, 1, KEY_VIEW);
+ key_ref = lookup_user_key(keyid, 0, 1, KEY_VIEW);
if (IS_ERR(key_ref)) {
/* viewing a key under construction is permitted if we have the
* authorisation token handy */
@@ -472,7 +472,7 @@ long keyctl_describe_key(key_serial_t keyid,
instkey = key_get_instantiation_authkey(keyid);
if (!IS_ERR(instkey)) {
key_put(instkey);
- key_ref = lookup_user_key(NULL, keyid,
+ key_ref = lookup_user_key(keyid,
0, 1, 0);
if (!IS_ERR(key_ref))
goto okay;
@@ -557,7 +557,7 @@ long keyctl_keyring_search(key_serial_t ringid,
}
/* get the keyring at which to begin the search */
- keyring_ref = lookup_user_key(NULL, ringid, 0, 0, KEY_SEARCH);
+ keyring_ref = lookup_user_key(ringid, 0, 0, KEY_SEARCH);
if (IS_ERR(keyring_ref)) {
ret = PTR_ERR(keyring_ref);
goto error2;
@@ -566,7 +566,7 @@ long keyctl_keyring_search(key_serial_t ringid,
/* get the destination keyring if specified */
dest_ref = NULL;
if (destringid) {
- dest_ref = lookup_user_key(NULL, destringid, 1, 0, KEY_WRITE);
+ dest_ref = lookup_user_key(destringid, 1, 0, KEY_WRITE);
if (IS_ERR(dest_ref)) {
ret = PTR_ERR(dest_ref);
goto error3;
@@ -636,7 +636,7 @@ long keyctl_read_key(key_serial_t keyid, char __user *buffer, size_t buflen)
long ret;
/* find the key first */
- key_ref = lookup_user_key(NULL, keyid, 0, 0, 0);
+ key_ref = lookup_user_key(keyid, 0, 0, 0);
if (IS_ERR(key_ref)) {
ret = -ENOKEY;
goto error;
@@ -699,7 +699,7 @@ long keyctl_chown_key(key_serial_t id, uid_t uid, gid_t gid)
if (uid == (uid_t) -1 && gid == (gid_t) -1)
goto error;
- key_ref = lookup_user_key(NULL, id, 1, 1, KEY_SETATTR);
+ key_ref = lookup_user_key(id, 1, 1, KEY_SETATTR);
if (IS_ERR(key_ref)) {
ret = PTR_ERR(key_ref);
goto error;
@@ -804,7 +804,7 @@ long keyctl_setperm_key(key_serial_t id, key_perm_t perm)
if (perm & ~(KEY_POS_ALL | KEY_USR_ALL | KEY_GRP_ALL | KEY_OTH_ALL))
goto error;
- key_ref = lookup_user_key(NULL, id, 1, 1, KEY_SETATTR);
+ key_ref = lookup_user_key(id, 1, 1, KEY_SETATTR);
if (IS_ERR(key_ref)) {
ret = PTR_ERR(key_ref);
goto error;
@@ -829,6 +829,43 @@ error:
} /* end keyctl_setperm_key() */
+/*
+ * get the destination keyring for instantiation
+ */
+static long get_instantiation_keyring(key_serial_t ringid,
+ struct request_key_auth *rka,
+ struct key **_dest_keyring)
+{
+ key_ref_t dkref;
+
+ /* just return a NULL pointer if we weren't asked to make a link */
+ if (ringid == 0) {
+ *_dest_keyring = NULL;
+ return 0;
+ }
+
+ /* if a specific keyring is nominated by ID, then use that */
+ if (ringid > 0) {
+ dkref = lookup_user_key(ringid, 1, 0, KEY_WRITE);
+ if (IS_ERR(dkref))
+ return PTR_ERR(dkref);
+ *_dest_keyring = key_ref_to_ptr(dkref);
+ return 0;
+ }
+
+ if (ringid == KEY_SPEC_REQKEY_AUTH_KEY)
+ return -EINVAL;
+
+ /* otherwise specify the destination keyring recorded in the
+ * authorisation key (any KEY_SPEC_*_KEYRING) */
+ if (ringid >= KEY_SPEC_REQUESTOR_KEYRING) {
+ *_dest_keyring = rka->dest_keyring;
+ return 0;
+ }
+
+ return -ENOKEY;
+}
+
/*****************************************************************************/
/*
* instantiate the key with the specified payload, and, if one is given, link
@@ -840,8 +877,7 @@ long keyctl_instantiate_key(key_serial_t id,
key_serial_t ringid)
{
struct request_key_auth *rka;
- struct key *instkey;
- key_ref_t keyring_ref;
+ struct key *instkey, *dest_keyring;
void *payload;
long ret;
bool vm = false;
@@ -883,21 +919,15 @@ long keyctl_instantiate_key(key_serial_t id,
/* find the destination keyring amongst those belonging to the
* requesting task */
- keyring_ref = NULL;
- if (ringid) {
- keyring_ref = lookup_user_key(rka->context, ringid, 1, 0,
- KEY_WRITE);
- if (IS_ERR(keyring_ref)) {
- ret = PTR_ERR(keyring_ref);
- goto error2;
- }
- }
+ ret = get_instantiation_keyring(ringid, rka, &dest_keyring);
+ if (ret < 0)
+ goto error2;
/* instantiate the key and link it into a keyring */
ret = key_instantiate_and_link(rka->target_key, payload, plen,
- key_ref_to_ptr(keyring_ref), instkey);
+ dest_keyring, instkey);
- key_ref_put(keyring_ref);
+ key_put(dest_keyring);
/* discard the assumed authority if it's just been disabled by
* instantiation of the key */
@@ -924,8 +954,7 @@ error:
long keyctl_negate_key(key_serial_t id, unsigned timeout, key_serial_t ringid)
{
struct request_key_auth *rka;
- struct key *instkey;
- key_ref_t keyring_ref;
+ struct key *instkey, *dest_keyring;
long ret;
/* the appropriate instantiation authorisation key must have been
@@ -941,20 +970,15 @@ long keyctl_negate_key(key_serial_t id, unsigned timeout, key_serial_t ringid)
/* find the destination keyring if present (which must also be
* writable) */
- keyring_ref = NULL;
- if (ringid) {
- keyring_ref = lookup_user_key(NULL, ringid, 1, 0, KEY_WRITE);
- if (IS_ERR(keyring_ref)) {
- ret = PTR_ERR(keyring_ref);
- goto error;
- }
- }
+ ret = get_instantiation_keyring(ringid, rka, &dest_keyring);
+ if (ret < 0)
+ goto error;
/* instantiate the key and link it into a keyring */
ret = key_negate_and_link(rka->target_key, timeout,
- key_ref_to_ptr(keyring_ref), instkey);
+ dest_keyring, instkey);
- key_ref_put(keyring_ref);
+ key_put(dest_keyring);
/* discard the assumed authority if it's just been disabled by
* instantiation of the key */
@@ -979,13 +1003,13 @@ long keyctl_set_reqkey_keyring(int reqkey_defl)
switch (reqkey_defl) {
case KEY_REQKEY_DEFL_THREAD_KEYRING:
- ret = install_thread_keyring(current);
+ ret = install_thread_keyring();
if (ret < 0)
return ret;
goto set;
case KEY_REQKEY_DEFL_PROCESS_KEYRING:
- ret = install_process_keyring(current);
+ ret = install_process_keyring();
if (ret < 0)
return ret;
@@ -1018,7 +1042,7 @@ long keyctl_set_timeout(key_serial_t id, unsigned timeout)
time_t expiry;
long ret;
- key_ref = lookup_user_key(NULL, id, 1, 1, KEY_SETATTR);
+ key_ref = lookup_user_key(id, 1, 1, KEY_SETATTR);
if (IS_ERR(key_ref)) {
ret = PTR_ERR(key_ref);
goto error;
@@ -1105,7 +1129,7 @@ long keyctl_get_security(key_serial_t keyid,
char *context;
long ret;
- key_ref = lookup_user_key(NULL, keyid, 0, 1, KEY_VIEW);
+ key_ref = lookup_user_key(keyid, 0, 1, KEY_VIEW);
if (IS_ERR(key_ref)) {
if (PTR_ERR(key_ref) != -EACCES)
return PTR_ERR(key_ref);
@@ -1117,7 +1141,7 @@ long keyctl_get_security(key_serial_t keyid,
return PTR_ERR(key_ref);
key_put(instkey);
- key_ref = lookup_user_key(NULL, keyid, 0, 1, 0);
+ key_ref = lookup_user_key(keyid, 0, 1, 0);
if (IS_ERR(key_ref))
return PTR_ERR(key_ref);
}
diff --git a/security/keys/process_keys.c b/security/keys/process_keys.c
index 5be6d018759..1c793b7090a 100644
--- a/security/keys/process_keys.c
+++ b/security/keys/process_keys.c
@@ -40,9 +40,9 @@ struct key_user root_key_user = {
/*
* install user and user session keyrings for a particular UID
*/
-static int install_user_keyrings(struct task_struct *tsk)
+int install_user_keyrings(void)
{
- struct user_struct *user = tsk->user;
+ struct user_struct *user = current->user;
struct key *uid_keyring, *session_keyring;
char buf[20];
int ret;
@@ -67,7 +67,7 @@ static int install_user_keyrings(struct task_struct *tsk)
uid_keyring = find_keyring_by_name(buf, true);
if (IS_ERR(uid_keyring)) {
uid_keyring = keyring_alloc(buf, user->uid, (gid_t) -1,
- tsk, KEY_ALLOC_IN_QUOTA,
+ current, KEY_ALLOC_IN_QUOTA,
NULL);
if (IS_ERR(uid_keyring)) {
ret = PTR_ERR(uid_keyring);
@@ -83,7 +83,8 @@ static int install_user_keyrings(struct task_struct *tsk)
if (IS_ERR(session_keyring)) {
session_keyring =
keyring_alloc(buf, user->uid, (gid_t) -1,
- tsk, KEY_ALLOC_IN_QUOTA, NULL);
+ current, KEY_ALLOC_IN_QUOTA,
+ NULL);
if (IS_ERR(session_keyring)) {
ret = PTR_ERR(session_keyring);
goto error_release;
@@ -146,8 +147,9 @@ void switch_uid_keyring(struct user_struct *new_user)
/*
* install a fresh thread keyring, discarding the old one
*/
-int install_thread_keyring(struct task_struct *tsk)
+int install_thread_keyring(void)
{
+ struct task_struct *tsk = current;
struct key *keyring, *old;
char buf[20];
int ret;
@@ -178,8 +180,9 @@ error:
/*
* make sure a process keyring is installed
*/
-int install_process_keyring(struct task_struct *tsk)
+int install_process_keyring(void)
{
+ struct task_struct *tsk = current;
struct key *keyring;
char buf[20];
int ret;
@@ -218,9 +221,9 @@ error:
* install a session keyring, discarding the old one
* - if a keyring is not supplied, an empty one is invented
*/
-static int install_session_keyring(struct task_struct *tsk,
- struct key *keyring)
+static int install_session_keyring(struct key *keyring)
{
+ struct task_struct *tsk = current;
unsigned long flags;
struct key *old;
char buf[20];
@@ -572,93 +575,91 @@ static int lookup_user_key_possessed(const struct key *key, const void *target)
* - don't create special keyrings unless so requested
* - partially constructed keys aren't found unless requested
*/
-key_ref_t lookup_user_key(struct task_struct *context, key_serial_t id,
- int create, int partial, key_perm_t perm)
+key_ref_t lookup_user_key(key_serial_t id, int create, int partial,
+ key_perm_t perm)
{
+ struct request_key_auth *rka;
+ struct task_struct *t = current;
key_ref_t key_ref, skey_ref;
struct key *key;
int ret;
- if (!context)
- context = current;
-
key_ref = ERR_PTR(-ENOKEY);
switch (id) {
case KEY_SPEC_THREAD_KEYRING:
- if (!context->thread_keyring) {
+ if (!t->thread_keyring) {
if (!create)
goto error;
- ret = install_thread_keyring(context);
+ ret = install_thread_keyring();
if (ret < 0) {
key = ERR_PTR(ret);
goto error;
}
}
- key = context->thread_keyring;
+ key = t->thread_keyring;
atomic_inc(&key->usage);
key_ref = make_key_ref(key, 1);
break;
case KEY_SPEC_PROCESS_KEYRING:
- if (!context->signal->process_keyring) {
+ if (!t->signal->process_keyring) {
if (!create)
goto error;
- ret = install_process_keyring(context);
+ ret = install_process_keyring();
if (ret < 0) {
key = ERR_PTR(ret);
goto error;
}
}
- key = context->signal->process_keyring;
+ key = t->signal->process_keyring;
atomic_inc(&key->usage);
key_ref = make_key_ref(key, 1);
break;
case KEY_SPEC_SESSION_KEYRING:
- if (!context->signal->session_keyring) {
+ if (!t->signal->session_keyring) {
/* always install a session keyring upon access if one
* doesn't exist yet */
- ret = install_user_keyrings(context);
+ ret = install_user_keyrings();
if (ret < 0)
goto error;
- ret = install_session_keyring(
- context, context->user->session_keyring);
+ ret = install_session_keyring(t->user->session_keyring);
if (ret < 0)
goto error;
}
rcu_read_lock();
- key = rcu_dereference(context->signal->session_keyring);
+ key = rcu_dereference(t->signal->session_keyring);
atomic_inc(&key->usage);
rcu_read_unlock();
key_ref = make_key_ref(key, 1);
break;
case KEY_SPEC_USER_KEYRING:
- if (!context->user->uid_keyring) {
- ret = install_user_keyrings(context);
+ if (!t->user->uid_keyring) {
+ ret = install_user_keyrings();
if (ret < 0)
goto error;
}
- key = context->user->uid_keyring;
+ key = t->user->uid_keyring;
atomic_inc(&key->usage);
key_ref = make_key_ref(key, 1);
break;
case KEY_SPEC_USER_SESSION_KEYRING:
- if (!context->user->session_keyring) {
- ret = install_user_keyrings(context);
+ if (!t->user->session_keyring) {
+ ret = install_user_keyrings();
if (ret < 0)
goto error;
}
- key = context->user->session_keyring;
+ key = t->user->session_keyring;
atomic_inc(&key->usage);
key_ref = make_key_ref(key, 1);
break;
@@ -669,7 +670,7 @@ key_ref_t lookup_user_key(struct task_struct *context, key_serial_t id,
goto error;
case KEY_SPEC_REQKEY_AUTH_KEY:
- key = context->request_key_auth;
+ key = t->request_key_auth;
if (!key)
goto error;
@@ -677,6 +678,25 @@ key_ref_t lookup_user_key(struct task_struct *context, key_serial_t id,
key_ref = make_key_ref(key, 1);
break;
+ case KEY_SPEC_REQUESTOR_KEYRING:
+ if (!t->request_key_auth)
+ goto error;
+
+ down_read(&t->request_key_auth->sem);
+ if (t->request_key_auth->flags & KEY_FLAG_REVOKED) {
+ key_ref = ERR_PTR(-EKEYREVOKED);
+ key = NULL;
+ } else {
+ rka = t->request_key_auth->payload.data;
+ key = rka->dest_keyring;
+ atomic_inc(&key->usage);
+ }
+ up_read(&t->request_key_auth->sem);
+ if (!key)
+ goto error;
+ key_ref = make_key_ref(key, 1);
+ break;
+
default:
key_ref = ERR_PTR(-EINVAL);
if (id < 1)
@@ -725,7 +745,7 @@ key_ref_t lookup_user_key(struct task_struct *context, key_serial_t id,
goto invalid_key;
/* check the permissions */
- ret = key_task_permission(key_ref, context, perm);
+ ret = key_task_permission(key_ref, t, perm);
if (ret < 0)
goto invalid_key;
@@ -754,7 +774,7 @@ long join_session_keyring(const char *name)
/* if no name is provided, install an anonymous keyring */
if (!name) {
- ret = install_session_keyring(tsk, NULL);
+ ret = install_session_keyring(NULL);
if (ret < 0)
goto error;
@@ -784,7 +804,7 @@ long join_session_keyring(const char *name)
}
/* we've got a keyring - now to install it */
- ret = install_session_keyring(tsk, keyring);
+ ret = install_session_keyring(keyring);
if (ret < 0)
goto error2;
diff --git a/security/keys/request_key.c b/security/keys/request_key.c
index 91953c81449..8e9d93b4a40 100644
--- a/security/keys/request_key.c
+++ b/security/keys/request_key.c
@@ -76,6 +76,10 @@ static int call_sbin_request_key(struct key_construction *cons,
kenter("{%d},{%d},%s", key->serial, authkey->serial, op);
+ ret = install_user_keyrings();
+ if (ret < 0)
+ goto error_alloc;
+
/* allocate a new session keyring */
sprintf(desc, "_req.%u", key->serial);
@@ -165,7 +169,8 @@ error_alloc:
* - we ignore program failure and go on key status instead
*/
static int construct_key(struct key *key, const void *callout_info,
- size_t callout_len, void *aux)
+ size_t callout_len, void *aux,
+ struct key *dest_keyring)
{
struct key_construction *cons;
request_key_actor_t actor;
@@ -179,7 +184,8 @@ static int construct_key(struct key *key, const void *callout_info,
return -ENOMEM;
/* allocate an authorisation key */
- authkey = request_key_auth_new(key, callout_info, callout_len);
+ authkey = request_key_auth_new(key, callout_info, callout_len,
+ dest_keyring);
if (IS_ERR(authkey)) {
kfree(cons);
ret = PTR_ERR(authkey);
@@ -207,27 +213,48 @@ static int construct_key(struct key *key, const void *callout_info,
}
/*
- * link a key to the appropriate destination keyring
- * - the caller must hold a write lock on the destination keyring
+ * get the appropriate destination keyring for the request
+ * - we return whatever keyring we select with an extra reference upon it which
+ * the caller must release
*/
-static void construct_key_make_link(struct key *key, struct key *dest_keyring)
+static void construct_get_dest_keyring(struct key **_dest_keyring)
{
+ struct request_key_auth *rka;
struct task_struct *tsk = current;
- struct key *drop = NULL;
+ struct key *dest_keyring = *_dest_keyring, *authkey;
- kenter("{%d},%p", key->serial, dest_keyring);
+ kenter("%p", dest_keyring);
/* find the appropriate keyring */
- if (!dest_keyring) {
+ if (dest_keyring) {
+ /* the caller supplied one */
+ key_get(dest_keyring);
+ } else {
+ /* use a default keyring; falling through the cases until we
+ * find one that we actually have */
switch (tsk->jit_keyring) {
case KEY_REQKEY_DEFL_DEFAULT:
+ case KEY_REQKEY_DEFL_REQUESTOR_KEYRING:
+ if (tsk->request_key_auth) {
+ authkey = tsk->request_key_auth;
+ down_read(&authkey->sem);
+ rka = authkey->payload.data;
+ if (!test_bit(KEY_FLAG_REVOKED,
+ &authkey->flags))
+ dest_keyring =
+ key_get(rka->dest_keyring);
+ up_read(&authkey->sem);
+ if (dest_keyring)
+ break;
+ }
+
case KEY_REQKEY_DEFL_THREAD_KEYRING:
- dest_keyring = tsk->thread_keyring;
+ dest_keyring = key_get(tsk->thread_keyring);
if (dest_keyring)
break;
case KEY_REQKEY_DEFL_PROCESS_KEYRING:
- dest_keyring = tsk->signal->process_keyring;
+ dest_keyring = key_get(tsk->signal->process_keyring);
if (dest_keyring)
break;
@@ -236,17 +263,16 @@ static void construct_key_make_link(struct key *key, struct key *dest_keyring)
dest_keyring = key_get(
rcu_dereference(tsk->signal->session_keyring));
rcu_read_unlock();
- drop = dest_keyring;
if (dest_keyring)
break;
case KEY_REQKEY_DEFL_USER_SESSION_KEYRING:
- dest_keyring = tsk->user->session_keyring;
+ dest_keyring = key_get(tsk->user->session_keyring);
break;
case KEY_REQKEY_DEFL_USER_KEYRING:
- dest_keyring = tsk->user->uid_keyring;
+ dest_keyring = key_get(tsk->user->uid_keyring);
break;
case KEY_REQKEY_DEFL_GROUP_KEYRING:
@@ -255,10 +281,9 @@ static void construct_key_make_link(struct key *key, struct key *dest_keyring)
}
}
- /* and attach the key to it */
- __key_link(dest_keyring, key);
- key_put(drop);
- kleave("");
+ *_dest_keyring = dest_keyring;
+ kleave(" [dk %d]", key_serial(dest_keyring));
+ return;
}
/*
@@ -288,8 +313,7 @@ static int construct_alloc_key(struct key_type *type,
set_bit(KEY_FLAG_USER_CONSTRUCT, &key->flags);
- if (dest_keyring)
- down_write(&dest_keyring->sem);
+ down_write(&dest_keyring->sem);
/* attach the key to the destination keyring under lock, but we do need
* to do another check just in case someone beat us to it whilst we
@@ -301,12 +325,10 @@ static int construct_alloc_key(struct key_type *type,
if (!IS_ERR(key_ref))
goto key_already_present;
- if (dest_keyring)
- construct_key_make_link(key, dest_keyring);
+ __key_link(dest_keyring, key);
mutex_unlock(&key_construction_mutex);
- if (dest_keyring)
- up_write(&dest_keyring->sem);
+ up_write(&dest_keyring->sem);
mutex_unlock(&user->cons_lock);
*_key = key;
kleave(" = 0 [%d]", key_serial(key));
@@ -348,21 +370,26 @@ static struct key *construct_key_and_link(struct key_type *type,
if (!user)
return ERR_PTR(-ENOMEM);
+ construct_get_dest_keyring(&dest_keyring);
+
ret = construct_alloc_key(type, description, dest_keyring, flags, user,
&key);
key_user_put(user);
if (ret == 0) {
- ret = construct_key(key, callout_info, callout_len, aux);
+ ret = construct_key(key, callout_info, callout_len, aux,
+ dest_keyring);
if (ret < 0)
goto construction_failed;
}
+ key_put(dest_keyring);
return key;
construction_failed:
key_negate_and_link(key, key_negative_timeout, NULL, NULL);
key_put(key);
+ key_put(dest_keyring);
return ERR_PTR(ret);
}
diff --git a/security/keys/request_key_auth.c b/security/keys/request_key_auth.c
index 729156b3485..1762d44711d 100644
--- a/security/keys/request_key_auth.c
+++ b/security/keys/request_key_auth.c
@@ -128,6 +128,7 @@ static void request_key_auth_destroy(struct key *key)
}
key_put(rka->target_key);
+ key_put(rka->dest_keyring);
kfree(rka->callout_info);
kfree(rka);
@@ -139,7 +140,7 @@ static void request_key_auth_destroy(struct key *key)
* access to the caller's security data
*/
struct key *request_key_auth_new(struct key *target, const void *callout_info,
- size_t callout_len)
+ size_t callout_len, struct key *dest_keyring)
{
struct request_key_auth *rka, *irka;
struct key *authkey = NULL;
@@ -188,6 +189,7 @@ struct key *request_key_auth_new(struct key *target, const void *callout_info,
}
rka->target_key = key_get(target);
+ rka->dest_keyring = key_get(dest_keyring);
memcpy(rka->callout_info, callout_info, callout_len);
rka->callout_len = callout_len;
@@ -223,6 +225,7 @@ error_inst:
key_put(authkey);
error_alloc:
key_put(rka->target_key);
+ key_put(rka->dest_keyring);
kfree(rka->callout_info);
kfree(rka);
kleave("= %d", ret);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-12 13:27:52 +0000