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SELinux: create new open permission

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Adds a new open permission inside SELinux when 'opening' a file.  The idea
is that opening a file and reading/writing to that file are not the same
thing.  Its different if a program had its stdout redirected to /tmp/output
than if the program tried to directly open /tmp/output. This should allow
policy writers to more liberally give read/write permissions across the
policy while still blocking many design and programing flaws SELinux is so
good at catching today.

Signed-off-by: Eric Paris <eparis@redhat.com>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
Reviewed-by: Paul Moore <paul.moore@hp.com>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Eric Paris
2008-02-28 12:58:40 -05:00
committed by James Morris
parent d4ee4231a3
commit b0c636b999
6 changed files with 47 additions and 2 deletions
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31
security/selinux/hooks.c
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@@ -1615,6 +1615,35 @@ static inline u32 file_mask_to_av(int mode, int mask)
return av;
}
/*
* Convert a file mask to an access vector and include the correct open
* open permission.
*/
static inline u32 open_file_mask_to_av(int mode, int mask)
{
u32 av = file_mask_to_av(mode, mask);
if (selinux_policycap_openperm) {
/*
* lnk files and socks do not really have an 'open'
*/
if (S_ISREG(mode))
av |= FILE__OPEN;
else if (S_ISCHR(mode))
av |= CHR_FILE__OPEN;
else if (S_ISBLK(mode))
av |= BLK_FILE__OPEN;
else if (S_ISFIFO(mode))
av |= FIFO_FILE__OPEN;
else if (S_ISDIR(mode))
av |= DIR__OPEN;
else
printk(KERN_ERR "SELinux: WARNING: inside open_file_to_av "
"with unknown mode:%x\n", mode);
}
return av;
}
/* Convert a Linux file to an access vector. */
static inline u32 file_to_av(struct file *file)
{
@@ -2532,7 +2561,7 @@ static int selinux_inode_permission(struct inode *inode, int mask,
}
return inode_has_perm(current, inode,
file_mask_to_av(inode->i_mode, mask), NULL);
open_file_mask_to_av(inode->i_mode, mask), NULL);
}
static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr)