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Security: add get, set, and cloning of superblock security information 

Adds security_get_sb_mnt_opts, security_set_sb_mnt_opts, and
security_clont_sb_mnt_opts to the LSM and to SELinux.  This will allow
filesystems to directly own and control all of their mount options if they
so choose.  This interface deals only with option identifiers and strings so
it should generic enough for any LSM which may come in the future.

Filesystems which pass text mount data around in the kernel (almost all of
them) need not currently make use of this interface when dealing with
SELinux since it will still parse those strings as it always has.  I assume
future LSM's would do the same.  NFS is the primary FS which does not use
text mount data and thus must make use of this interface.

An LSM would need to implement these functions only if they had mount time
options, such as selinux has context= or fscontext=.  If the LSM has no
mount time options they could simply not implement and let the dummy ops
take care of things.

An LSM other than SELinux would need to define new option numbers in
security.h and any FS which decides to own there own security options would
need to be patched to use this new interface for every possible LSM.  This
is because it was stated to me very clearly that LSM's should not attempt to
understand FS mount data and the burdon to understand security should be in
the FS which owns the options.

Signed-off-by: Eric Paris <eparis@redhat.com>
Acked-by: Stephen D. Smalley <sds@tycho.nsa.gov>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Eric Paris 2007-11-30 13:00:35 -05:00 committed by James Morris
parent 19c5fc198c
commit c9180a57a9
5 changed files with 590 additions and 267 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
include/linux/security.h
View File

@ -34,6 +34,12 @@
#include <linux/xfrm.h> #include <linux/xfrm.h>
#include <net/flow.h> #include <net/flow.h>
/* only a char in selinux superblock security struct flags */
#define FSCONTEXT_MNT 0x01
#define CONTEXT_MNT 0x02
#define ROOTCONTEXT_MNT 0x04
#define DEFCONTEXT_MNT 0x08
/* /*
* Bounding set * Bounding set
*/ */
@ -261,6 +267,22 @@ struct request_sock;
* Update module state after a successful pivot. * Update module state after a successful pivot.
* @old_nd contains the nameidata structure for the old root. * @old_nd contains the nameidata structure for the old root.
* @new_nd contains the nameidata structure for the new root. * @new_nd contains the nameidata structure for the new root.
* @sb_get_mnt_opts:
* Get the security relevant mount options used for a superblock
* @sb the superblock to get security mount options from
* @mount_options array for pointers to mount options
* @mount_flags array of ints specifying what each mount options is
* @num_opts number of options in the arrays
* @sb_set_mnt_opts:
* Set the security relevant mount options used for a superblock
* @sb the superblock to set security mount options for
* @mount_options array for pointers to mount options
* @mount_flags array of ints specifying what each mount options is
* @num_opts number of options in the arrays
* @sb_clone_mnt_opts:
* Copy all security options from a given superblock to another
* @oldsb old superblock which contain information to clone
* @newsb new superblock which needs filled in
* *
* Security hooks for inode operations. * Security hooks for inode operations.
* *
@ -1242,6 +1264,13 @@ struct security_operations {
struct nameidata * new_nd); struct nameidata * new_nd);
void (*sb_post_pivotroot) (struct nameidata * old_nd, void (*sb_post_pivotroot) (struct nameidata * old_nd,
struct nameidata * new_nd); struct nameidata * new_nd);
int (*sb_get_mnt_opts) (const struct super_block *sb,
char ***mount_options, int **flags,
int *num_opts);
int (*sb_set_mnt_opts) (struct super_block *sb, char **mount_options,
int *flags, int num_opts);
void (*sb_clone_mnt_opts) (const struct super_block *oldsb,
struct super_block *newsb);
int (*inode_alloc_security) (struct inode *inode); int (*inode_alloc_security) (struct inode *inode);
void (*inode_free_security) (struct inode *inode); void (*inode_free_security) (struct inode *inode);
@ -1499,6 +1528,13 @@ void security_sb_post_mountroot(void);
void security_sb_post_addmount(struct vfsmount *mnt, struct nameidata *mountpoint_nd); void security_sb_post_addmount(struct vfsmount *mnt, struct nameidata *mountpoint_nd);
int security_sb_pivotroot(struct nameidata *old_nd, struct nameidata *new_nd); int security_sb_pivotroot(struct nameidata *old_nd, struct nameidata *new_nd);
void security_sb_post_pivotroot(struct nameidata *old_nd, struct nameidata *new_nd); void security_sb_post_pivotroot(struct nameidata *old_nd, struct nameidata *new_nd);
int security_sb_get_mnt_opts(const struct super_block *sb, char ***mount_options,
int **flags, int *num_opts);
int security_sb_set_mnt_opts(struct super_block *sb, char **mount_options,
int *flags, int num_opts);
void security_sb_clone_mnt_opts(const struct super_block *oldsb,
struct super_block *newsb);
int security_inode_alloc(struct inode *inode); int security_inode_alloc(struct inode *inode);
void security_inode_free(struct inode *inode); void security_inode_free(struct inode *inode);
int security_inode_init_security(struct inode *inode, struct inode *dir, int security_inode_init_security(struct inode *inode, struct inode *dir,

26
security/dummy.c
View File

@ -245,6 +245,29 @@ static void dummy_sb_post_pivotroot (struct nameidata *old_nd, struct nameidata
return; return;
} }
static int dummy_sb_get_mnt_opts(const struct super_block *sb, char ***mount_options,
int **flags, int *num_opts)
{
*mount_options = NULL;
*flags = NULL;
*num_opts = 0;
return 0;
}
static int dummy_sb_set_mnt_opts(struct super_block *sb, char **mount_options,
int *flags, int num_opts)
{
if (unlikely(num_opts))
return -EOPNOTSUPP;
return 0;
}
static void dummy_sb_clone_mnt_opts(const struct super_block *oldsb,
struct super_block *newsb)
{
return;
}
static int dummy_inode_alloc_security (struct inode *inode) static int dummy_inode_alloc_security (struct inode *inode)
{ {
return 0; return 0;
@ -998,6 +1021,9 @@ void security_fixup_ops (struct security_operations *ops)
set_to_dummy_if_null(ops, sb_post_addmount); set_to_dummy_if_null(ops, sb_post_addmount);
set_to_dummy_if_null(ops, sb_pivotroot); set_to_dummy_if_null(ops, sb_pivotroot);
set_to_dummy_if_null(ops, sb_post_pivotroot); set_to_dummy_if_null(ops, sb_post_pivotroot);
set_to_dummy_if_null(ops, sb_get_mnt_opts);
set_to_dummy_if_null(ops, sb_set_mnt_opts);
set_to_dummy_if_null(ops, sb_clone_mnt_opts);
set_to_dummy_if_null(ops, inode_alloc_security); set_to_dummy_if_null(ops, inode_alloc_security);
set_to_dummy_if_null(ops, inode_free_security); set_to_dummy_if_null(ops, inode_free_security);
set_to_dummy_if_null(ops, inode_init_security); set_to_dummy_if_null(ops, inode_init_security);

20
security/security.c
View File

@ -308,6 +308,26 @@ void security_sb_post_pivotroot(struct nameidata *old_nd, struct nameidata *new_
security_ops->sb_post_pivotroot(old_nd, new_nd); security_ops->sb_post_pivotroot(old_nd, new_nd);
} }
int security_sb_get_mnt_opts(const struct super_block *sb,
char ***mount_options,
int **flags, int *num_opts)
{
return security_ops->sb_get_mnt_opts(sb, mount_options, flags, num_opts);
}
int security_sb_set_mnt_opts(struct super_block *sb,
char **mount_options,
int *flags, int num_opts)
{
return security_ops->sb_set_mnt_opts(sb, mount_options, flags, num_opts);
}
void security_sb_clone_mnt_opts(const struct super_block *oldsb,
struct super_block *newsb)
{
security_ops->sb_clone_mnt_opts(oldsb, newsb);
}
int security_inode_alloc(struct inode *inode) int security_inode_alloc(struct inode *inode)
{ {
inode->i_security = NULL; inode->i_security = NULL;

774
security/selinux/hooks.c
View File

@ -82,6 +82,8 @@
#define XATTR_SELINUX_SUFFIX "selinux" #define XATTR_SELINUX_SUFFIX "selinux"
#define XATTR_NAME_SELINUX XATTR_SECURITY_PREFIX XATTR_SELINUX_SUFFIX #define XATTR_NAME_SELINUX XATTR_SECURITY_PREFIX XATTR_SELINUX_SUFFIX
#define NUM_SEL_MNT_OPTS 4
extern unsigned int policydb_loaded_version; extern unsigned int policydb_loaded_version;
extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm); extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
extern int selinux_compat_net; extern int selinux_compat_net;
@ -321,8 +323,8 @@ enum {
Opt_error = -1, Opt_error = -1,
Opt_context = 1, Opt_context = 1,
Opt_fscontext = 2, Opt_fscontext = 2,
Opt_defcontext = 4, Opt_defcontext = 3,
Opt_rootcontext = 8, Opt_rootcontext = 4,
}; };
static match_table_t tokens = { static match_table_t tokens = {
@ -366,277 +368,26 @@ static int may_context_mount_inode_relabel(u32 sid,
return rc; return rc;
} }
static int try_context_mount(struct super_block *sb, void *data) static int sb_finish_set_opts(struct super_block *sb)
{
char *context = NULL, *defcontext = NULL;
char *fscontext = NULL, *rootcontext = NULL;
const char *name;
u32 sid;
int alloc = 0, rc = 0, seen = 0;
struct task_security_struct *tsec = current->security;
struct superblock_security_struct *sbsec = sb->s_security;
if (!data)
goto out;
name = sb->s_type->name;
if (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA) {
/* NFS we understand. */
if (!strcmp(name, "nfs")) {
struct nfs_mount_data *d = data;
if (d->version < NFS_MOUNT_VERSION)
goto out;
if (d->context[0]) {
context = d->context;
seen |= Opt_context;
}
} else
goto out;
} else {
/* Standard string-based options. */
char *p, *options = data;
while ((p = strsep(&options, "|")) != NULL) {
int token;
substring_t args[MAX_OPT_ARGS];
if (!*p)
continue;
token = match_token(p, tokens, args);
switch (token) {
case Opt_context:
if (seen & (Opt_context|Opt_defcontext)) {
rc = -EINVAL;
printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
goto out_free;
}
context = match_strdup(&args[0]);
if (!context) {
rc = -ENOMEM;
goto out_free;
}
if (!alloc)
alloc = 1;
seen |= Opt_context;
break;
case Opt_fscontext:
if (seen & Opt_fscontext) {
rc = -EINVAL;
printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
goto out_free;
}
fscontext = match_strdup(&args[0]);
if (!fscontext) {
rc = -ENOMEM;
goto out_free;
}
if (!alloc)
alloc = 1;
seen |= Opt_fscontext;
break;
case Opt_rootcontext:
if (seen & Opt_rootcontext) {
rc = -EINVAL;
printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
goto out_free;
}
rootcontext = match_strdup(&args[0]);
if (!rootcontext) {
rc = -ENOMEM;
goto out_free;
}
if (!alloc)
alloc = 1;
seen |= Opt_rootcontext;
break;
case Opt_defcontext:
if (sbsec->behavior != SECURITY_FS_USE_XATTR) {
rc = -EINVAL;
printk(KERN_WARNING "SELinux: "
"defcontext option is invalid "
"for this filesystem type\n");
goto out_free;
}
if (seen & (Opt_context|Opt_defcontext)) {
rc = -EINVAL;
printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
goto out_free;
}
defcontext = match_strdup(&args[0]);
if (!defcontext) {
rc = -ENOMEM;
goto out_free;
}
if (!alloc)
alloc = 1;
seen |= Opt_defcontext;
break;
default:
rc = -EINVAL;
printk(KERN_WARNING "SELinux: unknown mount "
"option\n");
goto out_free;
}
}
}
if (!seen)
goto out;
/* sets the context of the superblock for the fs being mounted. */
if (fscontext) {
rc = security_context_to_sid(fscontext, strlen(fscontext), &sid);
if (rc) {
printk(KERN_WARNING "SELinux: security_context_to_sid"
"(%s) failed for (dev %s, type %s) errno=%d\n",
fscontext, sb->s_id, name, rc);
goto out_free;
}
rc = may_context_mount_sb_relabel(sid, sbsec, tsec);
if (rc)
goto out_free;
sbsec->sid = sid;
}
/*
* Switch to using mount point labeling behavior.
* sets the label used on all file below the mountpoint, and will set
* the superblock context if not already set.
*/
if (context) {
rc = security_context_to_sid(context, strlen(context), &sid);
if (rc) {
printk(KERN_WARNING "SELinux: security_context_to_sid"
"(%s) failed for (dev %s, type %s) errno=%d\n",
context, sb->s_id, name, rc);
goto out_free;
}
if (!fscontext) {
rc = may_context_mount_sb_relabel(sid, sbsec, tsec);
if (rc)
goto out_free;
sbsec->sid = sid;
} else {
rc = may_context_mount_inode_relabel(sid, sbsec, tsec);
if (rc)
goto out_free;
}
sbsec->mntpoint_sid = sid;
sbsec->behavior = SECURITY_FS_USE_MNTPOINT;
}
if (rootcontext) {
struct inode *inode = sb->s_root->d_inode;
struct inode_security_struct *isec = inode->i_security;
rc = security_context_to_sid(rootcontext, strlen(rootcontext), &sid);
if (rc) {
printk(KERN_WARNING "SELinux: security_context_to_sid"
"(%s) failed for (dev %s, type %s) errno=%d\n",
rootcontext, sb->s_id, name, rc);
goto out_free;
}
rc = may_context_mount_inode_relabel(sid, sbsec, tsec);
if (rc)
goto out_free;
isec->sid = sid;
isec->initialized = 1;
}
if (defcontext) {
rc = security_context_to_sid(defcontext, strlen(defcontext), &sid);
if (rc) {
printk(KERN_WARNING "SELinux: security_context_to_sid"
"(%s) failed for (dev %s, type %s) errno=%d\n",
defcontext, sb->s_id, name, rc);
goto out_free;
}
if (sid == sbsec->def_sid)
goto out_free;
rc = may_context_mount_inode_relabel(sid, sbsec, tsec);
if (rc)
goto out_free;
sbsec->def_sid = sid;
}
out_free:
if (alloc) {
kfree(context);
kfree(defcontext);
kfree(fscontext);
kfree(rootcontext);
}
out:
return rc;
}
static int superblock_doinit(struct super_block *sb, void *data)
{ {
struct superblock_security_struct *sbsec = sb->s_security; struct superblock_security_struct *sbsec = sb->s_security;
struct dentry *root = sb->s_root; struct dentry *root = sb->s_root;
struct inode *inode = root->d_inode; struct inode *root_inode = root->d_inode;
int rc = 0; int rc = 0;
mutex_lock(&sbsec->lock);
if (sbsec->initialized)
goto out;
if (!ss_initialized) {
/* Defer initialization until selinux_complete_init,
after the initial policy is loaded and the security
server is ready to handle calls. */
spin_lock(&sb_security_lock);
if (list_empty(&sbsec->list))
list_add(&sbsec->list, &superblock_security_head);
spin_unlock(&sb_security_lock);
goto out;
}
/* Determine the labeling behavior to use for this filesystem type. */
rc = security_fs_use(sb->s_type->name, &sbsec->behavior, &sbsec->sid);
if (rc) {
printk(KERN_WARNING "%s: security_fs_use(%s) returned %d\n",
__FUNCTION__, sb->s_type->name, rc);
goto out;
}
rc = try_context_mount(sb, data);
if (rc)
goto out;
if (sbsec->behavior == SECURITY_FS_USE_XATTR) { if (sbsec->behavior == SECURITY_FS_USE_XATTR) {
/* Make sure that the xattr handler exists and that no /* Make sure that the xattr handler exists and that no
error other than -ENODATA is returned by getxattr on error other than -ENODATA is returned by getxattr on
the root directory. -ENODATA is ok, as this may be the root directory. -ENODATA is ok, as this may be
the first boot of the SELinux kernel before we have the first boot of the SELinux kernel before we have
assigned xattr values to the filesystem. */ assigned xattr values to the filesystem. */
if (!inode->i_op->getxattr) { if (!root_inode->i_op->getxattr) {
printk(KERN_WARNING "SELinux: (dev %s, type %s) has no " printk(KERN_WARNING "SELinux: (dev %s, type %s) has no "
"xattr support\n", sb->s_id, sb->s_type->name); "xattr support\n", sb->s_id, sb->s_type->name);
rc = -EOPNOTSUPP; rc = -EOPNOTSUPP;
goto out; goto out;
} }
rc = inode->i_op->getxattr(root, XATTR_NAME_SELINUX, NULL, 0); rc = root_inode->i_op->getxattr(root, XATTR_NAME_SELINUX, NULL, 0);
if (rc < 0 && rc != -ENODATA) { if (rc < 0 && rc != -ENODATA) {
if (rc == -EOPNOTSUPP) if (rc == -EOPNOTSUPP)
printk(KERN_WARNING "SELinux: (dev %s, type " printk(KERN_WARNING "SELinux: (dev %s, type "
@ -650,23 +401,18 @@ static int superblock_doinit(struct super_block *sb, void *data)
} }
} }
if (strcmp(sb->s_type->name, "proc") == 0)
sbsec->proc = 1;
sbsec->initialized = 1; sbsec->initialized = 1;
if (sbsec->behavior > ARRAY_SIZE(labeling_behaviors)) { if (sbsec->behavior > ARRAY_SIZE(labeling_behaviors))
printk(KERN_ERR "SELinux: initialized (dev %s, type %s), unknown behavior\n", printk(KERN_ERR "SELinux: initialized (dev %s, type %s), unknown behavior\n",
sb->s_id, sb->s_type->name); sb->s_id, sb->s_type->name);
} else
else {
printk(KERN_DEBUG "SELinux: initialized (dev %s, type %s), %s\n", printk(KERN_DEBUG "SELinux: initialized (dev %s, type %s), %s\n",
sb->s_id, sb->s_type->name, sb->s_id, sb->s_type->name,
labeling_behaviors[sbsec->behavior-1]); labeling_behaviors[sbsec->behavior-1]);
}
/* Initialize the root inode. */ /* Initialize the root inode. */
rc = inode_doinit_with_dentry(sb->s_root->d_inode, sb->s_root); rc = inode_doinit_with_dentry(root_inode, root);
/* Initialize any other inodes associated with the superblock, e.g. /* Initialize any other inodes associated with the superblock, e.g.
inodes created prior to initial policy load or inodes created inodes created prior to initial policy load or inodes created
@ -677,12 +423,12 @@ static int superblock_doinit(struct super_block *sb, void *data)
if (!list_empty(&sbsec->isec_head)) { if (!list_empty(&sbsec->isec_head)) {
struct inode_security_struct *isec = struct inode_security_struct *isec =
list_entry(sbsec->isec_head.next, list_entry(sbsec->isec_head.next,
struct inode_security_struct, list); struct inode_security_struct, list);
struct inode *inode = isec->inode; struct inode *inode = isec->inode;
spin_unlock(&sbsec->isec_lock); spin_unlock(&sbsec->isec_lock);
inode = igrab(inode); inode = igrab(inode);
if (inode) { if (inode) {
if (!IS_PRIVATE (inode)) if (!IS_PRIVATE(inode))
inode_doinit(inode); inode_doinit(inode);
iput(inode); iput(inode);
} }
@ -691,9 +437,500 @@ static int superblock_doinit(struct super_block *sb, void *data)
goto next_inode; goto next_inode;
} }
spin_unlock(&sbsec->isec_lock); spin_unlock(&sbsec->isec_lock);
out:
return rc;
}
/*
* This function should allow an FS to ask what it's mount security
* options were so it can use those later for submounts, displaying
* mount options, or whatever.
*/
static int selinux_get_mnt_opts(const struct super_block *sb,
char ***mount_options, int **mnt_opts_flags,
int *num_opts)
{
int rc = 0, i;
struct superblock_security_struct *sbsec = sb->s_security;
char *context = NULL;
u32 len;
char tmp;
*num_opts = 0;
*mount_options = NULL;
*mnt_opts_flags = NULL;
if (!sbsec->initialized)
return -EINVAL;
if (!ss_initialized)
return -EINVAL;
/*
* if we ever use sbsec flags for anything other than tracking mount
* settings this is going to need a mask
*/
tmp = sbsec->flags;
/* count the number of mount options for this sb */
for (i = 0; i < 8; i++) {
if (tmp & 0x01)
(*num_opts)++;
tmp >>= 1;
}
*mount_options = kcalloc(*num_opts, sizeof(char *), GFP_ATOMIC);
if (!*mount_options) {
rc = -ENOMEM;
goto out_free;
}
*mnt_opts_flags = kcalloc(*num_opts, sizeof(int), GFP_ATOMIC);
if (!*mnt_opts_flags) {
rc = -ENOMEM;
goto out_free;
}
i = 0;
if (sbsec->flags & FSCONTEXT_MNT) {
rc = security_sid_to_context(sbsec->sid, &context, &len);
if (rc)
goto out_free;
(*mount_options)[i] = context;
(*mnt_opts_flags)[i++] = FSCONTEXT_MNT;
}
if (sbsec->flags & CONTEXT_MNT) {
rc = security_sid_to_context(sbsec->mntpoint_sid, &context, &len);
if (rc)
goto out_free;
(*mount_options)[i] = context;
(*mnt_opts_flags)[i++] = CONTEXT_MNT;
}
if (sbsec->flags & DEFCONTEXT_MNT) {
rc = security_sid_to_context(sbsec->def_sid, &context, &len);
if (rc)
goto out_free;
(*mount_options)[i] = context;
(*mnt_opts_flags)[i++] = DEFCONTEXT_MNT;
}
if (sbsec->flags & ROOTCONTEXT_MNT) {
struct inode *root = sbsec->sb->s_root->d_inode;
struct inode_security_struct *isec = root->i_security;
rc = security_sid_to_context(isec->sid, &context, &len);
if (rc)
goto out_free;
(*mount_options)[i] = context;
(*mnt_opts_flags)[i++] = ROOTCONTEXT_MNT;
}
BUG_ON(i != *num_opts);
return 0;
out_free:
/* don't leak context string if security_sid_to_context had an error */
if (*mount_options && i)
for (; i > 0; i--)
kfree((*mount_options)[i-1]);
kfree(*mount_options);
*mount_options = NULL;
kfree(*mnt_opts_flags);
*mnt_opts_flags = NULL;
*num_opts = 0;
return rc;
}
static int bad_option(struct superblock_security_struct *sbsec, char flag,
u32 old_sid, u32 new_sid)
{
/* check if the old mount command had the same options */
if (sbsec->initialized)
if (!(sbsec->flags & flag) ||
(old_sid != new_sid))
return 1;
/* check if we were passed the same options twice,
* aka someone passed context=a,context=b
*/
if (!sbsec->initialized)
if (sbsec->flags & flag)
return 1;
return 0;
}
/*
* Allow filesystems with binary mount data to explicitly set mount point
* labeling information.
*/
int selinux_set_mnt_opts(struct super_block *sb, char **mount_options,
int *flags, int num_opts)
{
int rc = 0, i;
struct task_security_struct *tsec = current->security;
struct superblock_security_struct *sbsec = sb->s_security;
const char *name = sb->s_type->name;
struct inode *inode = sbsec->sb->s_root->d_inode;
struct inode_security_struct *root_isec = inode->i_security;
u32 fscontext_sid = 0, context_sid = 0, rootcontext_sid = 0;
u32 defcontext_sid = 0;
mutex_lock(&sbsec->lock);
if (!ss_initialized) {
if (!num_opts) {
/* Defer initialization until selinux_complete_init,
after the initial policy is loaded and the security
server is ready to handle calls. */
spin_lock(&sb_security_lock);
if (list_empty(&sbsec->list))
list_add(&sbsec->list, &superblock_security_head);
spin_unlock(&sb_security_lock);
goto out;
}
rc = -EINVAL;
printk(KERN_WARNING "Unable to set superblock options before "
"the security server is initialized\n");
goto out;
}
/*
* parse the mount options, check if they are valid sids.
* also check if someone is trying to mount the same sb more
* than once with different security options.
*/
for (i = 0; i < num_opts; i++) {
u32 sid;
rc = security_context_to_sid(mount_options[i],
strlen(mount_options[i]), &sid);
if (rc) {
printk(KERN_WARNING "SELinux: security_context_to_sid"
"(%s) failed for (dev %s, type %s) errno=%d\n",
mount_options[i], sb->s_id, name, rc);
goto out;
}
switch (flags[i]) {
case FSCONTEXT_MNT:
fscontext_sid = sid;
if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid,
fscontext_sid))
goto out_double_mount;
sbsec->flags |= FSCONTEXT_MNT;
break;
case CONTEXT_MNT:
context_sid = sid;
if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid,
context_sid))
goto out_double_mount;
sbsec->flags |= CONTEXT_MNT;
break;
case ROOTCONTEXT_MNT:
rootcontext_sid = sid;
if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid,
rootcontext_sid))
goto out_double_mount;
sbsec->flags |= ROOTCONTEXT_MNT;
break;
case DEFCONTEXT_MNT:
defcontext_sid = sid;
if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid,
defcontext_sid))
goto out_double_mount;
sbsec->flags |= DEFCONTEXT_MNT;
break;
default:
rc = -EINVAL;
goto out;
}
}
if (sbsec->initialized) {
/* previously mounted with options, but not on this attempt? */
if (sbsec->flags && !num_opts)
goto out_double_mount;
rc = 0;
goto out;
}
if (strcmp(sb->s_type->name, "proc") == 0)
sbsec->proc = 1;
/* Determine the labeling behavior to use for this filesystem type. */
rc = security_fs_use(sb->s_type->name, &sbsec->behavior, &sbsec->sid);
if (rc) {
printk(KERN_WARNING "%s: security_fs_use(%s) returned %d\n",
__FUNCTION__, sb->s_type->name, rc);
goto out;
}
/* sets the context of the superblock for the fs being mounted. */
if (fscontext_sid) {
rc = may_context_mount_sb_relabel(fscontext_sid, sbsec, tsec);
if (rc)
goto out;
sbsec->sid = fscontext_sid;
}
/*
* Switch to using mount point labeling behavior.
* sets the label used on all file below the mountpoint, and will set
* the superblock context if not already set.
*/
if (context_sid) {
if (!fscontext_sid) {
rc = may_context_mount_sb_relabel(context_sid, sbsec, tsec);
if (rc)
goto out;
sbsec->sid = context_sid;
} else {
rc = may_context_mount_inode_relabel(context_sid, sbsec, tsec);
if (rc)
goto out;
}
if (!rootcontext_sid)
rootcontext_sid = context_sid;
sbsec->mntpoint_sid = context_sid;
sbsec->behavior = SECURITY_FS_USE_MNTPOINT;
}
if (rootcontext_sid) {
rc = may_context_mount_inode_relabel(rootcontext_sid, sbsec, tsec);
if (rc)
goto out;
root_isec->sid = rootcontext_sid;
root_isec->initialized = 1;
}
if (defcontext_sid) {
if (sbsec->behavior != SECURITY_FS_USE_XATTR) {
rc = -EINVAL;
printk(KERN_WARNING "SELinux: defcontext option is "
"invalid for this filesystem type\n");
goto out;
}
if (defcontext_sid != sbsec->def_sid) {
rc = may_context_mount_inode_relabel(defcontext_sid,
sbsec, tsec);
if (rc)
goto out;
}
sbsec->def_sid = defcontext_sid;
}
rc = sb_finish_set_opts(sb);
out: out:
mutex_unlock(&sbsec->lock); mutex_unlock(&sbsec->lock);
return rc; return rc;
out_double_mount:
rc = -EINVAL;
printk(KERN_WARNING "SELinux: mount invalid. Same superblock, different "
"security settings for (dev %s, type %s)\n", sb->s_id, name);
goto out;
}
static void selinux_sb_clone_mnt_opts(const struct super_block *oldsb,
struct super_block *newsb)
{
const struct superblock_security_struct *oldsbsec = oldsb->s_security;
struct superblock_security_struct *newsbsec = newsb->s_security;
int set_fscontext = (oldsbsec->flags & FSCONTEXT_MNT);
int set_context = (oldsbsec->flags & CONTEXT_MNT);
int set_rootcontext = (oldsbsec->flags & ROOTCONTEXT_MNT);
/* we can't error, we can't save the info, this shouldn't get called
* this early in the boot process. */
BUG_ON(!ss_initialized);
/* this might go away sometime down the line if there is a new user
* of clone, but for now, nfs better not get here... */
BUG_ON(newsbsec->initialized);
/* how can we clone if the old one wasn't set up?? */
BUG_ON(!oldsbsec->initialized);
mutex_lock(&newsbsec->lock);
newsbsec->flags = oldsbsec->flags;
newsbsec->sid = oldsbsec->sid;
newsbsec->def_sid = oldsbsec->def_sid;
newsbsec->behavior = oldsbsec->behavior;
if (set_context) {
u32 sid = oldsbsec->mntpoint_sid;
if (!set_fscontext)
newsbsec->sid = sid;
if (!set_rootcontext) {
struct inode *newinode = newsb->s_root->d_inode;
struct inode_security_struct *newisec = newinode->i_security;
newisec->sid = sid;
}
newsbsec->mntpoint_sid = sid;
}
if (set_rootcontext) {
const struct inode *oldinode = oldsb->s_root->d_inode;
const struct inode_security_struct *oldisec = oldinode->i_security;
struct inode *newinode = newsb->s_root->d_inode;
struct inode_security_struct *newisec = newinode->i_security;
newisec->sid = oldisec->sid;
}
sb_finish_set_opts(newsb);
mutex_unlock(&newsbsec->lock);
}
/*
* string mount options parsing and call set the sbsec
*/
static int superblock_doinit(struct super_block *sb, void *data)
{
char *context = NULL, *defcontext = NULL;
char *fscontext = NULL, *rootcontext = NULL;
int rc = 0;
char *p, *options = data;
/* selinux only know about a fixed number of mount options */
char *mnt_opts[NUM_SEL_MNT_OPTS];
int mnt_opts_flags[NUM_SEL_MNT_OPTS], num_mnt_opts = 0;
if (!data)
goto out;
/* with the nfs patch this will become a goto out; */
if (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA) {
const char *name = sb->s_type->name;
/* NFS we understand. */
if (!strcmp(name, "nfs")) {
struct nfs_mount_data *d = data;
if (d->version != NFS_MOUNT_VERSION)
goto out;
if (d->context[0]) {
context = kstrdup(d->context, GFP_KERNEL);
if (!context) {
rc = -ENOMEM;
goto out;
}
}
goto build_flags;
} else
goto out;
}
/* Standard string-based options. */
while ((p = strsep(&options, "|")) != NULL) {
int token;
substring_t args[MAX_OPT_ARGS];
if (!*p)
continue;
token = match_token(p, tokens, args);
switch (token) {
case Opt_context:
if (context || defcontext) {
rc = -EINVAL;
printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
goto out_err;
}
context = match_strdup(&args[0]);
if (!context) {
rc = -ENOMEM;
goto out_err;
}
break;
case Opt_fscontext:
if (fscontext) {
rc = -EINVAL;
printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
goto out_err;
}
fscontext = match_strdup(&args[0]);
if (!fscontext) {
rc = -ENOMEM;
goto out_err;
}
break;
case Opt_rootcontext:
if (rootcontext) {
rc = -EINVAL;
printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
goto out_err;
}
rootcontext = match_strdup(&args[0]);
if (!rootcontext) {
rc = -ENOMEM;
goto out_err;
}
break;
case Opt_defcontext:
if (context || defcontext) {
rc = -EINVAL;
printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
goto out_err;
}
defcontext = match_strdup(&args[0]);
if (!defcontext) {
rc = -ENOMEM;
goto out_err;
}
break;
default:
rc = -EINVAL;
printk(KERN_WARNING "SELinux: unknown mount option\n");
goto out_err;
}
}
build_flags:
if (fscontext) {
mnt_opts[num_mnt_opts] = fscontext;
mnt_opts_flags[num_mnt_opts++] = FSCONTEXT_MNT;
}
if (context) {
mnt_opts[num_mnt_opts] = context;
mnt_opts_flags[num_mnt_opts++] = CONTEXT_MNT;
}
if (rootcontext) {
mnt_opts[num_mnt_opts] = rootcontext;
mnt_opts_flags[num_mnt_opts++] = ROOTCONTEXT_MNT;
}
if (defcontext) {
mnt_opts[num_mnt_opts] = defcontext;
mnt_opts_flags[num_mnt_opts++] = DEFCONTEXT_MNT;
}
out:
rc = selinux_set_mnt_opts(sb, mnt_opts, mnt_opts_flags, num_mnt_opts);
out_err:
kfree(context);
kfree(defcontext);
kfree(fscontext);
kfree(rootcontext);
return rc;
} }
static inline u16 inode_mode_to_security_class(umode_t mode) static inline u16 inode_mode_to_security_class(umode_t mode)
@ -4800,6 +5037,9 @@ static struct security_operations selinux_ops = {
.sb_statfs = selinux_sb_statfs, .sb_statfs = selinux_sb_statfs,
.sb_mount = selinux_mount, .sb_mount = selinux_mount,
.sb_umount = selinux_umount, .sb_umount = selinux_umount,
.sb_get_mnt_opts = selinux_get_mnt_opts,
.sb_set_mnt_opts = selinux_set_mnt_opts,
.sb_clone_mnt_opts = selinux_sb_clone_mnt_opts,
.inode_alloc_security = selinux_inode_alloc_security, .inode_alloc_security = selinux_inode_alloc_security,
.inode_free_security = selinux_inode_free_security, .inode_free_security = selinux_inode_free_security,

1
security/selinux/include/objsec.h
View File

@ -65,6 +65,7 @@ struct superblock_security_struct {
u32 mntpoint_sid; /* SECURITY_FS_USE_MNTPOINT context for files */ u32 mntpoint_sid; /* SECURITY_FS_USE_MNTPOINT context for files */
unsigned int behavior; /* labeling behavior */ unsigned int behavior; /* labeling behavior */
unsigned char initialized; /* initialization flag */ unsigned char initialized; /* initialization flag */
unsigned char flags; /* which mount options were specified */
unsigned char proc; /* proc fs */ unsigned char proc; /* proc fs */
struct mutex lock; struct mutex lock;
struct list_head isec_head; struct list_head isec_head;