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selinux: allow kernfs symlinks to inherit parent directory context

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Currently symlinks on kernel filesystems, like sysfs, are labeled on
creation with the parent filesystem root sid.

Allow symlinks to inherit the parent directory context, so fine-grained
kernfs labeling can be applied to symlinks too and checking contexts
doesn't complain about them.

For backward-compatibility this behavior is contained in a new policy
capability: genfs_seclabel_symlinks

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Christian Göttsche 2020-01-28 20:16:48 +01:00 committed by Paul Moore
parent 06c2efe2cf
commit 7470d0d13f
3 changed files with 13 additions and 2 deletions
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4
security/selinux/hooks.c
View File

@ -1478,7 +1478,9 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
/* Default to the fs superblock SID. */
sid = sbsec->sid;
if ((sbsec->flags & SE_SBGENFS) && !S_ISLNK(inode->i_mode)) {
if ((sbsec->flags & SE_SBGENFS) &&
(!S_ISLNK(inode->i_mode) ||
selinux_policycap_genfs_seclabel_symlinks())) {
/* We must have a dentry to determine the label on
* procfs inodes */
if (opt_dentry) {

8
security/selinux/include/security.h
View File

@ -79,6 +79,7 @@ enum {
POLICYDB_CAPABILITY_ALWAYSNETWORK,
POLICYDB_CAPABILITY_CGROUPSECLABEL,
POLICYDB_CAPABILITY_NNP_NOSUID_TRANSITION,
POLICYDB_CAPABILITY_GENFS_SECLABEL_SYMLINKS,
__POLICYDB_CAPABILITY_MAX
};
#define POLICYDB_CAPABILITY_MAX (__POLICYDB_CAPABILITY_MAX - 1)
@ -213,6 +214,13 @@ static inline bool selinux_policycap_nnp_nosuid_transition(void)
return state->policycap[POLICYDB_CAPABILITY_NNP_NOSUID_TRANSITION];
}
static inline bool selinux_policycap_genfs_seclabel_symlinks(void)
{
struct selinux_state *state = &selinux_state;
return state->policycap[POLICYDB_CAPABILITY_GENFS_SECLABEL_SYMLINKS];
}
int security_mls_enabled(struct selinux_state *state);
int security_load_policy(struct selinux_state *state,
void *data, size_t len);

3
security/selinux/ss/services.c
View File

@ -72,7 +72,8 @@ const char *selinux_policycap_names[__POLICYDB_CAPABILITY_MAX] = {
"extended_socket_class",
"always_check_network",
"cgroup_seclabel",
"nnp_nosuid_transition"
"nnp_nosuid_transition",
"genfs_seclabel_symlinks"
};
static struct selinux_ss selinux_ss;