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Merge branch 'master' of git://git.infradead.org/users/pcmoore/selinux into ra-next

This commit is contained in:
James Morris 2013-10-22 22:26:41 +11:00
parent eb8948a037 42d64e1add
commit 6f799c97f3
17 changed files with 451 additions and 401 deletions
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26
include/linux/security.h
View File

@ -1052,17 +1052,25 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
* @xfrm_policy_delete_security:
* @ctx contains the xfrm_sec_ctx.
* Authorize deletion of xp->security.
* @xfrm_state_alloc_security:
* @xfrm_state_alloc:
* @x contains the xfrm_state being added to the Security Association
* Database by the XFRM system.
* @sec_ctx contains the security context information being provided by
* the user-level SA generation program (e.g., setkey or racoon).
* @secid contains the secid from which to take the mls portion of the context.
* Allocate a security structure to the x->security field; the security
* field is initialized to NULL when the xfrm_state is allocated. Set the
* context to correspond to either sec_ctx or polsec, with the mls portion
* taken from secid in the latter case.
* Return 0 if operation was successful (memory to allocate, legal context).
* context to correspond to sec_ctx. Return 0 if operation was successful
* (memory to allocate, legal context).
* @xfrm_state_alloc_acquire:
* @x contains the xfrm_state being added to the Security Association
* Database by the XFRM system.
* @polsec contains the policy's security context.
* @secid contains the secid from which to take the mls portion of the
* context.
* Allocate a security structure to the x->security field; the security
* field is initialized to NULL when the xfrm_state is allocated. Set the
* context to correspond to secid. Return 0 if operation was successful
* (memory to allocate, legal context).
* @xfrm_state_free_security:
* @x contains the xfrm_state.
* Deallocate x->security.
@ -1679,9 +1687,11 @@ struct security_operations {
int (*xfrm_policy_clone_security) (struct xfrm_sec_ctx *old_ctx, struct xfrm_sec_ctx **new_ctx);
void (*xfrm_policy_free_security) (struct xfrm_sec_ctx *ctx);
int (*xfrm_policy_delete_security) (struct xfrm_sec_ctx *ctx);
int (*xfrm_state_alloc_security) (struct xfrm_state *x,
struct xfrm_user_sec_ctx *sec_ctx,
u32 secid);
int (*xfrm_state_alloc) (struct xfrm_state *x,
struct xfrm_user_sec_ctx *sec_ctx);
int (*xfrm_state_alloc_acquire) (struct xfrm_state *x,
struct xfrm_sec_ctx *polsec,
u32 secid);
void (*xfrm_state_free_security) (struct xfrm_state *x);
int (*xfrm_state_delete_security) (struct xfrm_state *x);
int (*xfrm_policy_lookup) (struct xfrm_sec_ctx *ctx, u32 fl_secid, u8 dir);

15
security/capability.c
View File

@ -777,9 +777,15 @@ static int cap_xfrm_policy_delete_security(struct xfrm_sec_ctx *ctx)
return 0;
}
static int cap_xfrm_state_alloc_security(struct xfrm_state *x,
struct xfrm_user_sec_ctx *sec_ctx,
u32 secid)
static int cap_xfrm_state_alloc(struct xfrm_state *x,
struct xfrm_user_sec_ctx *sec_ctx)
{
return 0;
}
static int cap_xfrm_state_alloc_acquire(struct xfrm_state *x,
struct xfrm_sec_ctx *polsec,
u32 secid)
{
return 0;
}
@ -1101,7 +1107,8 @@ void __init security_fixup_ops(struct security_operations *ops)
set_to_cap_if_null(ops, xfrm_policy_clone_security);
set_to_cap_if_null(ops, xfrm_policy_free_security);
set_to_cap_if_null(ops, xfrm_policy_delete_security);
set_to_cap_if_null(ops, xfrm_state_alloc_security);
set_to_cap_if_null(ops, xfrm_state_alloc);
set_to_cap_if_null(ops, xfrm_state_alloc_acquire);
set_to_cap_if_null(ops, xfrm_state_free_security);
set_to_cap_if_null(ops, xfrm_state_delete_security);
set_to_cap_if_null(ops, xfrm_policy_lookup);

13
security/security.c
View File

@ -1340,22 +1340,17 @@ int security_xfrm_policy_delete(struct xfrm_sec_ctx *ctx)
return security_ops->xfrm_policy_delete_security(ctx);
}
int security_xfrm_state_alloc(struct xfrm_state *x, struct xfrm_user_sec_ctx *sec_ctx)
int security_xfrm_state_alloc(struct xfrm_state *x,
struct xfrm_user_sec_ctx *sec_ctx)
{
return security_ops->xfrm_state_alloc_security(x, sec_ctx, 0);
return security_ops->xfrm_state_alloc(x, sec_ctx);
}
EXPORT_SYMBOL(security_xfrm_state_alloc);
int security_xfrm_state_alloc_acquire(struct xfrm_state *x,
struct xfrm_sec_ctx *polsec, u32 secid)
{
if (!polsec)
return 0;
/*
* We want the context to be taken from secid which is usually
* from the sock.
*/
return security_ops->xfrm_state_alloc_security(x, NULL, secid);
return security_ops->xfrm_state_alloc_acquire(x, polsec, secid);
}
int security_xfrm_state_delete(struct xfrm_state *x)

146
security/selinux/hooks.c
View File

@ -95,7 +95,9 @@
#include "audit.h"
#include "avc_ss.h"
#define NUM_SEL_MNT_OPTS 5
#define SB_TYPE_FMT "%s%s%s"
#define SB_SUBTYPE(sb) (sb->s_subtype && sb->s_subtype[0])
#define SB_TYPE_ARGS(sb) sb->s_type->name, SB_SUBTYPE(sb) ? "." : "", SB_SUBTYPE(sb) ? sb->s_subtype : ""
extern struct security_operations *security_ops;
@ -139,12 +141,28 @@ static struct kmem_cache *sel_inode_cache;
* This function checks the SECMARK reference counter to see if any SECMARK
* targets are currently configured, if the reference counter is greater than
* zero SECMARK is considered to be enabled. Returns true (1) if SECMARK is
* enabled, false (0) if SECMARK is disabled.
* enabled, false (0) if SECMARK is disabled. If the always_check_network
* policy capability is enabled, SECMARK is always considered enabled.
*
*/
static int selinux_secmark_enabled(void)
{
return (atomic_read(&selinux_secmark_refcount) > 0);
return (selinux_policycap_alwaysnetwork || atomic_read(&selinux_secmark_refcount));
}
/**
* selinux_peerlbl_enabled - Check to see if peer labeling is currently enabled
*
* Description:
* This function checks if NetLabel or labeled IPSEC is enabled. Returns true
* (1) if any are enabled or false (0) if neither are enabled. If the
* always_check_network policy capability is enabled, peer labeling
* is always considered enabled.
*
*/
static int selinux_peerlbl_enabled(void)
{
return (selinux_policycap_alwaysnetwork || netlbl_enabled() || selinux_xfrm_enabled());
}
/*
@ -309,8 +327,11 @@ enum {
Opt_defcontext = 3,
Opt_rootcontext = 4,
Opt_labelsupport = 5,
Opt_nextmntopt = 6,
};
#define NUM_SEL_MNT_OPTS (Opt_nextmntopt - 1)
static const match_table_t tokens = {
{Opt_context, CONTEXT_STR "%s"},
{Opt_fscontext, FSCONTEXT_STR "%s"},
@ -355,6 +376,29 @@ static int may_context_mount_inode_relabel(u32 sid,
return rc;
}
static int selinux_is_sblabel_mnt(struct super_block *sb)
{
struct superblock_security_struct *sbsec = sb->s_security;
if (sbsec->behavior == SECURITY_FS_USE_XATTR ||
sbsec->behavior == SECURITY_FS_USE_TRANS ||
sbsec->behavior == SECURITY_FS_USE_TASK)
return 1;
/* Special handling for sysfs. Is genfs but also has setxattr handler*/
if (strncmp(sb->s_type->name, "sysfs", sizeof("sysfs")) == 0)
return 1;
/*
* Special handling for rootfs. Is genfs but supports
* setting SELinux context on in-core inodes.
*/
if (strncmp(sb->s_type->name, "rootfs", sizeof("rootfs")) == 0)
return 1;
return 0;
}
static int sb_finish_set_opts(struct super_block *sb)
{
struct superblock_security_struct *sbsec = sb->s_security;
@ -369,8 +413,8 @@ static int sb_finish_set_opts(struct super_block *sb)
the first boot of the SELinux kernel before we have
assigned xattr values to the filesystem. */
if (!root_inode->i_op->getxattr) {
printk(KERN_WARNING "SELinux: (dev %s, type %s) has no "
"xattr support\n", sb->s_id, sb->s_type->name);
printk(KERN_WARNING "SELinux: (dev %s, type "SB_TYPE_FMT") has no "
"xattr support\n", sb->s_id, SB_TYPE_ARGS(sb));
rc = -EOPNOTSUPP;
goto out;
}
@ -378,35 +422,27 @@ static int sb_finish_set_opts(struct super_block *sb)
if (rc < 0 && rc != -ENODATA) {
if (rc == -EOPNOTSUPP)
printk(KERN_WARNING "SELinux: (dev %s, type "
"%s) has no security xattr handler\n",
sb->s_id, sb->s_type->name);
SB_TYPE_FMT") has no security xattr handler\n",
sb->s_id, SB_TYPE_ARGS(sb));
else
printk(KERN_WARNING "SELinux: (dev %s, type "
"%s) getxattr errno %d\n", sb->s_id,
sb->s_type->name, -rc);
SB_TYPE_FMT") getxattr errno %d\n", sb->s_id,
SB_TYPE_ARGS(sb), -rc);
goto out;
}
}
sbsec->flags |= (SE_SBINITIALIZED | SE_SBLABELSUPP);
if (sbsec->behavior > ARRAY_SIZE(labeling_behaviors))
printk(KERN_ERR "SELinux: initialized (dev %s, type %s), unknown behavior\n",
sb->s_id, sb->s_type->name);
printk(KERN_ERR "SELinux: initialized (dev %s, type "SB_TYPE_FMT"), unknown behavior\n",
sb->s_id, SB_TYPE_ARGS(sb));
else
printk(KERN_DEBUG "SELinux: initialized (dev %s, type %s), %s\n",
sb->s_id, sb->s_type->name,
printk(KERN_DEBUG "SELinux: initialized (dev %s, type "SB_TYPE_FMT"), %s\n",
sb->s_id, SB_TYPE_ARGS(sb),
labeling_behaviors[sbsec->behavior-1]);
if (sbsec->behavior == SECURITY_FS_USE_GENFS ||
sbsec->behavior == SECURITY_FS_USE_MNTPOINT ||
sbsec->behavior == SECURITY_FS_USE_NONE ||
sbsec->behavior > ARRAY_SIZE(labeling_behaviors))
sbsec->flags &= ~SE_SBLABELSUPP;
/* Special handling for sysfs. Is genfs but also has setxattr handler*/
if (strncmp(sb->s_type->name, "sysfs", sizeof("sysfs")) == 0)
sbsec->flags |= SE_SBLABELSUPP;
sbsec->flags |= SE_SBINITIALIZED;
if (selinux_is_sblabel_mnt(sb))
sbsec->flags |= SBLABEL_MNT;
/* Initialize the root inode. */
rc = inode_doinit_with_dentry(root_inode, root);
@ -460,15 +496,18 @@ static int selinux_get_mnt_opts(const struct super_block *sb,
if (!ss_initialized)
return -EINVAL;
/* make sure we always check enough bits to cover the mask */
BUILD_BUG_ON(SE_MNTMASK >= (1 << NUM_SEL_MNT_OPTS));
tmp = sbsec->flags & SE_MNTMASK;
/* count the number of mount options for this sb */
for (i = 0; i < 8; i++) {
for (i = 0; i < NUM_SEL_MNT_OPTS; i++) {
if (tmp & 0x01)
opts->num_mnt_opts++;
tmp >>= 1;
}
/* Check if the Label support flag is set */
if (sbsec->flags & SE_SBLABELSUPP)
if (sbsec->flags & SBLABEL_MNT)
opts->num_mnt_opts++;
opts->mnt_opts = kcalloc(opts->num_mnt_opts, sizeof(char *), GFP_ATOMIC);
@ -515,9 +554,9 @@ static int selinux_get_mnt_opts(const struct super_block *sb,
opts->mnt_opts[i] = context;
opts->mnt_opts_flags[i++] = ROOTCONTEXT_MNT;
}
if (sbsec->flags & SE_SBLABELSUPP) {
if (sbsec->flags & SBLABEL_MNT) {
opts->mnt_opts[i] = NULL;
opts->mnt_opts_flags[i++] = SE_SBLABELSUPP;
opts->mnt_opts_flags[i++] = SBLABEL_MNT;
}
BUG_ON(i != opts->num_mnt_opts);
@ -561,7 +600,6 @@ static int selinux_set_mnt_opts(struct super_block *sb,
const struct cred *cred = current_cred();
int rc = 0, i;
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;
@ -614,14 +652,14 @@ static int selinux_set_mnt_opts(struct super_block *sb,
for (i = 0; i < num_opts; i++) {
u32 sid;
if (flags[i] == SE_SBLABELSUPP)
if (flags[i] == SBLABEL_MNT)
continue;
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);
"(%s) failed for (dev %s, type "SB_TYPE_FMT") errno=%d\n",
mount_options[i], sb->s_id, SB_TYPE_ARGS(sb), rc);
goto out;
}
switch (flags[i]) {
@ -685,9 +723,7 @@ static int selinux_set_mnt_opts(struct super_block *sb,
* Determine the labeling behavior to use for this
* filesystem type.
*/
rc = security_fs_use((sbsec->flags & SE_SBPROC) ?
"proc" : sb->s_type->name,
&sbsec->behavior, &sbsec->sid);
rc = security_fs_use(sb);
if (rc) {
printk(KERN_WARNING
"%s: security_fs_use(%s) returned %d\n",
@ -770,7 +806,8 @@ static int selinux_set_mnt_opts(struct super_block *sb,
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);
"security settings for (dev %s, type "SB_TYPE_FMT")\n", sb->s_id,
SB_TYPE_ARGS(sb));
goto out;
}
@ -1037,7 +1074,7 @@ static void selinux_write_opts(struct seq_file *m,
case DEFCONTEXT_MNT:
prefix = DEFCONTEXT_STR;
break;
case SE_SBLABELSUPP:
case SBLABEL_MNT:
seq_putc(m, ',');
seq_puts(m, LABELSUPP_STR);
continue;
@ -1650,7 +1687,7 @@ static int may_create(struct inode *dir,
if (rc)
return rc;
if (!newsid || !(sbsec->flags & SE_SBLABELSUPP)) {
if (!newsid || !(sbsec->flags & SBLABEL_MNT)) {
rc = security_transition_sid(sid, dsec->sid, tclass,
&dentry->d_name, &newsid);
if (rc)
@ -2438,14 +2475,14 @@ static int selinux_sb_remount(struct super_block *sb, void *data)
u32 sid;
size_t len;
if (flags[i] == SE_SBLABELSUPP)
if (flags[i] == SBLABEL_MNT)
continue;
len = strlen(mount_options[i]);
rc = security_context_to_sid(mount_options[i], len, &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, sb->s_type->name, rc);
"(%s) failed for (dev %s, type "SB_TYPE_FMT") errno=%d\n",
mount_options[i], sb->s_id, SB_TYPE_ARGS(sb), rc);
goto out_free_opts;
}
rc = -EINVAL;
@ -2483,8 +2520,8 @@ static int selinux_sb_remount(struct super_block *sb, void *data)
return rc;
out_bad_option:
printk(KERN_WARNING "SELinux: unable to change security options "
"during remount (dev %s, type=%s)\n", sb->s_id,
sb->s_type->name);
"during remount (dev %s, type "SB_TYPE_FMT")\n", sb->s_id,
SB_TYPE_ARGS(sb));
goto out_free_opts;
}
@ -2607,7 +2644,7 @@ static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
if ((sbsec->flags & SE_SBINITIALIZED) &&
(sbsec->behavior == SECURITY_FS_USE_MNTPOINT))
newsid = sbsec->mntpoint_sid;
else if (!newsid || !(sbsec->flags & SE_SBLABELSUPP)) {
else if (!newsid || !(sbsec->flags & SBLABEL_MNT)) {
rc = security_transition_sid(sid, dsec->sid,
inode_mode_to_security_class(inode->i_mode),
qstr, &newsid);
@ -2629,7 +2666,7 @@ static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
isec->initialized = 1;
}
if (!ss_initialized || !(sbsec->flags & SE_SBLABELSUPP))
if (!ss_initialized || !(sbsec->flags & SBLABEL_MNT))
return -EOPNOTSUPP;
if (name)
@ -2831,7 +2868,7 @@ static int selinux_inode_setxattr(struct dentry *dentry, const char *name,
return selinux_inode_setotherxattr(dentry, name);
sbsec = inode->i_sb->s_security;
if (!(sbsec->flags & SE_SBLABELSUPP))
if (!(sbsec->flags & SBLABEL_MNT))
return -EOPNOTSUPP;
if (!inode_owner_or_capable(inode))
@ -3792,8 +3829,12 @@ static int selinux_skb_peerlbl_sid(struct sk_buff *skb, u16 family, u32 *sid)
u32 nlbl_sid;
u32 nlbl_type;
selinux_skb_xfrm_sid(skb, &xfrm_sid);
selinux_netlbl_skbuff_getsid(skb, family, &nlbl_type, &nlbl_sid);
err = selinux_skb_xfrm_sid(skb, &xfrm_sid);
if (unlikely(err))
return -EACCES;
err = selinux_netlbl_skbuff_getsid(skb, family, &nlbl_type, &nlbl_sid);
if (unlikely(err))
return -EACCES;
err = security_net_peersid_resolve(nlbl_sid, nlbl_type, xfrm_sid, sid);
if (unlikely(err)) {
@ -4247,7 +4288,7 @@ static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
return selinux_sock_rcv_skb_compat(sk, skb, family);
secmark_active = selinux_secmark_enabled();
peerlbl_active = netlbl_enabled() || selinux_xfrm_enabled();
peerlbl_active = selinux_peerlbl_enabled();
if (!secmark_active && !peerlbl_active)
return 0;
@ -4629,7 +4670,7 @@ static unsigned int selinux_ip_forward(struct sk_buff *skb, int ifindex,
secmark_active = selinux_secmark_enabled();
netlbl_active = netlbl_enabled();
peerlbl_active = netlbl_active || selinux_xfrm_enabled();
peerlbl_active = selinux_peerlbl_enabled();
if (!secmark_active && !peerlbl_active)
return NF_ACCEPT;
@ -4781,7 +4822,7 @@ static unsigned int selinux_ip_postroute(struct sk_buff *skb, int ifindex,
return NF_ACCEPT;
#endif
secmark_active = selinux_secmark_enabled();
peerlbl_active = netlbl_enabled() || selinux_xfrm_enabled();
peerlbl_active = selinux_peerlbl_enabled();
if (!secmark_active && !peerlbl_active)
return NF_ACCEPT;
@ -5785,7 +5826,8 @@ static struct security_operations selinux_ops = {
.xfrm_policy_clone_security = selinux_xfrm_policy_clone,
.xfrm_policy_free_security = selinux_xfrm_policy_free,
.xfrm_policy_delete_security = selinux_xfrm_policy_delete,
.xfrm_state_alloc_security = selinux_xfrm_state_alloc,
.xfrm_state_alloc = selinux_xfrm_state_alloc,
.xfrm_state_alloc_acquire = selinux_xfrm_state_alloc_acquire,
.xfrm_state_free_security = selinux_xfrm_state_free,
.xfrm_state_delete_security = selinux_xfrm_state_delete,
.xfrm_policy_lookup = selinux_xfrm_policy_lookup,

4
security/selinux/include/objsec.h
View File

@ -58,8 +58,8 @@ struct superblock_security_struct {
u32 sid; /* SID of file system superblock */
u32 def_sid; /* default SID for labeling */
u32 mntpoint_sid; /* SECURITY_FS_USE_MNTPOINT context for files */
unsigned int behavior; /* labeling behavior */
unsigned char flags; /* which mount options were specified */
unsigned short behavior; /* labeling behavior */
unsigned short flags; /* which mount options were specified */
struct mutex lock;
struct list_head isec_head;
spinlock_t isec_lock;

13
security/selinux/include/security.h
View File

@ -45,14 +45,15 @@
/* Mask for just the mount related flags */
#define SE_MNTMASK 0x0f
/* Super block security struct flags for mount options */
/* BE CAREFUL, these need to be the low order bits for selinux_get_mnt_opts */
#define CONTEXT_MNT 0x01
#define FSCONTEXT_MNT 0x02
#define ROOTCONTEXT_MNT 0x04
#define DEFCONTEXT_MNT 0x08
#define SBLABEL_MNT 0x10
/* Non-mount related flags */
#define SE_SBINITIALIZED 0x10
#define SE_SBPROC 0x20
#define SE_SBLABELSUPP 0x40
#define SE_SBINITIALIZED 0x0100
#define SE_SBPROC 0x0200
#define CONTEXT_STR "context="
#define FSCONTEXT_STR "fscontext="
@ -68,12 +69,15 @@ extern int selinux_enabled;
enum {
POLICYDB_CAPABILITY_NETPEER,
POLICYDB_CAPABILITY_OPENPERM,
POLICYDB_CAPABILITY_REDHAT1,
POLICYDB_CAPABILITY_ALWAYSNETWORK,
__POLICYDB_CAPABILITY_MAX
};
#define POLICYDB_CAPABILITY_MAX (__POLICYDB_CAPABILITY_MAX - 1)
extern int selinux_policycap_netpeer;
extern int selinux_policycap_openperm;
extern int selinux_policycap_alwaysnetwork;
/*
* type_datum properties
@ -172,8 +176,7 @@ int security_get_allow_unknown(void);
#define SECURITY_FS_USE_NATIVE 7 /* use native label support */
#define SECURITY_FS_USE_MAX 7 /* Highest SECURITY_FS_USE_XXX */
int security_fs_use(const char *fstype, unsigned int *behavior,
u32 *sid);
int security_fs_use(struct super_block *sb);
int security_genfs_sid(const char *fstype, char *name, u16 sclass,
u32 *sid);

45
security/selinux/include/xfrm.h
View File

@ -10,29 +10,21 @@
#include <net/flow.h>
int selinux_xfrm_policy_alloc(struct xfrm_sec_ctx **ctxp,
struct xfrm_user_sec_ctx *sec_ctx);
struct xfrm_user_sec_ctx *uctx);
int selinux_xfrm_policy_clone(struct xfrm_sec_ctx *old_ctx,
struct xfrm_sec_ctx **new_ctxp);
void selinux_xfrm_policy_free(struct xfrm_sec_ctx *ctx);
int selinux_xfrm_policy_delete(struct xfrm_sec_ctx *ctx);
int selinux_xfrm_state_alloc(struct xfrm_state *x,
struct xfrm_user_sec_ctx *sec_ctx, u32 secid);
struct xfrm_user_sec_ctx *uctx);
int selinux_xfrm_state_alloc_acquire(struct xfrm_state *x,
struct xfrm_sec_ctx *polsec, u32 secid);
void selinux_xfrm_state_free(struct xfrm_state *x);
int selinux_xfrm_state_delete(struct xfrm_state *x);
int selinux_xfrm_policy_lookup(struct xfrm_sec_ctx *ctx, u32 fl_secid, u8 dir);
int selinux_xfrm_state_pol_flow_match(struct xfrm_state *x,
struct xfrm_policy *xp, const struct flowi *fl);
/*
* Extract the security blob from the sock (it's actually on the socket)
*/
static inline struct inode_security_struct *get_sock_isec(struct sock *sk)
{
if (!sk->sk_socket)
return NULL;
return SOCK_INODE(sk->sk_socket)->i_security;
}
struct xfrm_policy *xp,
const struct flowi *fl);
#ifdef CONFIG_SECURITY_NETWORK_XFRM
extern atomic_t selinux_xfrm_refcount;
@ -42,10 +34,10 @@ static inline int selinux_xfrm_enabled(void)
return (atomic_read(&selinux_xfrm_refcount) > 0);
}
int selinux_xfrm_sock_rcv_skb(u32 sid, struct sk_buff *skb,
struct common_audit_data *ad);
int selinux_xfrm_postroute_last(u32 isec_sid, struct sk_buff *skb,
struct common_audit_data *ad, u8 proto);
int selinux_xfrm_sock_rcv_skb(u32 sk_sid, struct sk_buff *skb,
struct common_audit_data *ad);
int selinux_xfrm_postroute_last(u32 sk_sid, struct sk_buff *skb,
struct common_audit_data *ad, u8 proto);
int selinux_xfrm_decode_session(struct sk_buff *skb, u32 *sid, int ckall);
static inline void selinux_xfrm_notify_policyload(void)
@ -64,19 +56,21 @@ static inline int selinux_xfrm_enabled(void)
return 0;
}
static inline int selinux_xfrm_sock_rcv_skb(u32 isec_sid, struct sk_buff *skb,
struct common_audit_data *ad)
static inline int selinux_xfrm_sock_rcv_skb(u32 sk_sid, struct sk_buff *skb,
struct common_audit_data *ad)
{
return 0;
}
static inline int selinux_xfrm_postroute_last(u32 isec_sid, struct sk_buff *skb,
struct common_audit_data *ad, u8 proto)
static inline int selinux_xfrm_postroute_last(u32 sk_sid, struct sk_buff *skb,
struct common_audit_data *ad,
u8 proto)
{
return 0;
}
static inline int selinux_xfrm_decode_session(struct sk_buff *skb, u32 *sid, int ckall)
static inline int selinux_xfrm_decode_session(struct sk_buff *skb, u32 *sid,
int ckall)
{
*sid = SECSID_NULL;
return 0;
@ -87,10 +81,9 @@ static inline void selinux_xfrm_notify_policyload(void)
}
#endif
static inline void selinux_skb_xfrm_sid(struct sk_buff *skb, u32 *sid)
static inline int selinux_skb_xfrm_sid(struct sk_buff *skb, u32 *sid)
{
int err = selinux_xfrm_decode_session(skb, sid, 0);
BUG_ON(err);
return selinux_xfrm_decode_session(skb, sid, 0);
}
#endif /* _SELINUX_XFRM_H_ */

6
security/selinux/netlabel.c
View File

@ -442,8 +442,7 @@ int selinux_netlbl_socket_connect(struct sock *sk, struct sockaddr *addr)
sksec->nlbl_state != NLBL_CONNLABELED)
return 0;
local_bh_disable();
bh_lock_sock_nested(sk);
lock_sock(sk);
/* connected sockets are allowed to disconnect when the address family
* is set to AF_UNSPEC, if that is what is happening we want to reset
@ -464,7 +463,6 @@ int selinux_netlbl_socket_connect(struct sock *sk, struct sockaddr *addr)
sksec->nlbl_state = NLBL_CONNLABELED;
socket_connect_return:
bh_unlock_sock(sk);
local_bh_enable();
release_sock(sk);
return rc;
}

2
security/selinux/netnode.c
View File

@ -166,6 +166,7 @@ static void sel_netnode_insert(struct sel_netnode *node)
break;
default:
BUG();
return;
}
/* we need to impose a limit on the growth of the hash table so check
@ -225,6 +226,7 @@ static int sel_netnode_sid_slow(void *addr, u16 family, u32 *sid)
break;
default:
BUG();
ret = -EINVAL;
}
if (ret != 0)
goto out;

4
security/selinux/selinuxfs.c
View File

@ -44,7 +44,9 @@
/* Policy capability filenames */
static char *policycap_names[] = {
"network_peer_controls",
"open_perms"
"open_perms",
"redhat1",
"always_check_network"
};
unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;

20
security/selinux/ss/ebitmap.c
View File

@ -213,7 +213,12 @@ int ebitmap_netlbl_import(struct ebitmap *ebmap,
}
#endif /* CONFIG_NETLABEL */
int ebitmap_contains(struct ebitmap *e1, struct ebitmap *e2)
/*
* Check to see if all the bits set in e2 are also set in e1. Optionally,
* if last_e2bit is non-zero, the highest set bit in e2 cannot exceed
* last_e2bit.
*/
int ebitmap_contains(struct ebitmap *e1, struct ebitmap *e2, u32 last_e2bit)
{
struct ebitmap_node *n1, *n2;
int i;
@ -223,14 +228,25 @@ int ebitmap_contains(struct ebitmap *e1, struct ebitmap *e2)
n1 = e1->node;
n2 = e2->node;
while (n1 && n2 && (n1->startbit <= n2->startbit)) {
if (n1->startbit < n2->startbit) {
n1 = n1->next;
continue;
}
for (i = 0; i < EBITMAP_UNIT_NUMS; i++) {
for (i = EBITMAP_UNIT_NUMS - 1; (i >= 0) && !n2->maps[i]; )
i--; /* Skip trailing NULL map entries */
if (last_e2bit && (i >= 0)) {
u32 lastsetbit = n2->startbit + i * EBITMAP_UNIT_SIZE +
__fls(n2->maps[i]);
if (lastsetbit > last_e2bit)
return 0;
}
while (i >= 0) {
if ((n1->maps[i] & n2->maps[i]) != n2->maps[i])
return 0;
i--;
}
n1 = n1->next;

10
security/selinux/ss/ebitmap.h
View File

@ -16,7 +16,13 @@
#include <net/netlabel.h>
#define EBITMAP_UNIT_NUMS ((32 - sizeof(void *) - sizeof(u32)) \
#ifdef CONFIG_64BIT
#define EBITMAP_NODE_SIZE 64
#else
#define EBITMAP_NODE_SIZE 32
#endif
#define EBITMAP_UNIT_NUMS ((EBITMAP_NODE_SIZE-sizeof(void *)-sizeof(u32))\
/ sizeof(unsigned long))
#define EBITMAP_UNIT_SIZE BITS_PER_LONG
#define EBITMAP_SIZE (EBITMAP_UNIT_NUMS * EBITMAP_UNIT_SIZE)
@ -117,7 +123,7 @@ static inline void ebitmap_node_clr_bit(struct ebitmap_node *n,
int ebitmap_cmp(struct ebitmap *e1, struct ebitmap *e2);
int ebitmap_cpy(struct ebitmap *dst, struct ebitmap *src);
int ebitmap_contains(struct ebitmap *e1, struct ebitmap *e2);
int ebitmap_contains(struct ebitmap *e1, struct ebitmap *e2, u32 last_e2bit);
int ebitmap_get_bit(struct ebitmap *e, unsigned long bit);
int ebitmap_set_bit(struct ebitmap *e, unsigned long bit, int value);
void ebitmap_destroy(struct ebitmap *e);

22
security/selinux/ss/mls.c
View File

@ -160,8 +160,6 @@ void mls_sid_to_context(struct context *context,
int mls_level_isvalid(struct policydb *p, struct mls_level *l)
{
struct level_datum *levdatum;
struct ebitmap_node *node;
int i;
if (!l->sens || l->sens > p->p_levels.nprim)
return 0;
@ -170,19 +168,13 @@ int mls_level_isvalid(struct policydb *p, struct mls_level *l)
if (!levdatum)
return 0;
ebitmap_for_each_positive_bit(&l->cat, node, i) {
if (i > p->p_cats.nprim)
return 0;
if (!ebitmap_get_bit(&levdatum->level->cat, i)) {
/*
* Category may not be associated with
* sensitivity.
*/
return 0;
}
}
return 1;
/*
* Return 1 iff all the bits set in l->cat are also be set in
* levdatum->level->cat and no bit in l->cat is larger than
* p->p_cats.nprim.
*/
return ebitmap_contains(&levdatum->level->cat, &l->cat,
p->p_cats.nprim);
}
int mls_range_isvalid(struct policydb *p, struct mls_range *r)

2
security/selinux/ss/mls_types.h
View File

@ -35,7 +35,7 @@ static inline int mls_level_eq(struct mls_level *l1, struct mls_level *l2)
static inline int mls_level_dom(struct mls_level *l1, struct mls_level *l2)
{
return ((l1->sens >= l2->sens) &&
ebitmap_contains(&l1->cat, &l2->cat));
ebitmap_contains(&l1->cat, &l2->cat, 0));
}
#define mls_level_incomp(l1, l2) \

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

@ -3203,9 +3203,8 @@ static int range_write_helper(void *key, void *data, void *ptr)
static int range_write(struct policydb *p, void *fp)
{
size_t nel;
__le32 buf[1];
int rc;
int rc, nel;
struct policy_data pd;
pd.p = p;

66
security/selinux/ss/services.c
View File

@ -72,6 +72,7 @@
int selinux_policycap_netpeer;
int selinux_policycap_openperm;
int selinux_policycap_alwaysnetwork;
static DEFINE_RWLOCK(policy_rwlock);
@ -1812,6 +1813,8 @@ static void security_load_policycaps(void)
POLICYDB_CAPABILITY_NETPEER);
selinux_policycap_openperm = ebitmap_get_bit(&policydb.policycaps,
POLICYDB_CAPABILITY_OPENPERM);
selinux_policycap_alwaysnetwork = ebitmap_get_bit(&policydb.policycaps,
POLICYDB_CAPABILITY_ALWAYSNETWORK);
}
static int security_preserve_bools(struct policydb *p);
@ -2323,43 +2326,74 @@ int security_genfs_sid(const char *fstype,
/**
* security_fs_use - Determine how to handle labeling for a filesystem.
* @fstype: filesystem type
* @behavior: labeling behavior
* @sid: SID for filesystem (superblock)
* @sb: superblock in question
*/
int security_fs_use(
const char *fstype,
unsigned int *behavior,
u32 *sid)
int security_fs_use(struct super_block *sb)
{
int rc = 0;
struct ocontext *c;
struct superblock_security_struct *sbsec = sb->s_security;
const char *fstype = sb->s_type->name;
const char *subtype = (sb->s_subtype && sb->s_subtype[0]) ? sb->s_subtype : NULL;
struct ocontext *base = NULL;
read_lock(&policy_rwlock);
c = policydb.ocontexts[OCON_FSUSE];
while (c) {
if (strcmp(fstype, c->u.name) == 0)
for (c = policydb.ocontexts[OCON_FSUSE]; c; c = c->next) {
char *sub;
int baselen;
baselen = strlen(fstype);
/* if base does not match, this is not the one */
if (strncmp(fstype, c->u.name, baselen))
continue;
/* if there is no subtype, this is the one! */
if (!subtype)
break;
/* skip past the base in this entry */
sub = c->u.name + baselen;
/* entry is only a base. save it. keep looking for subtype */
if (sub[0] == '\0') {
base = c;
continue;
}
/* entry is not followed by a subtype, so it is not a match */
if (sub[0] != '.')
continue;
/* whew, we found a subtype of this fstype */
sub++; /* move past '.' */
/* exact match of fstype AND subtype */
if (!strcmp(subtype, sub))
break;
c = c->next;
}
/* in case we had found an fstype match but no subtype match */
if (!c)
c = base;
if (c) {
*behavior = c->v.behavior;
sbsec->behavior = c->v.behavior;
if (!c->sid[0]) {
rc = sidtab_context_to_sid(&sidtab, &c->context[0],
&c->sid[0]);
if (rc)
goto out;
}
*sid = c->sid[0];
sbsec->sid = c->sid[0];
} else {
rc = security_genfs_sid(fstype, "/", SECCLASS_DIR, sid);
rc = security_genfs_sid(fstype, "/", SECCLASS_DIR, &sbsec->sid);
if (rc) {
*behavior = SECURITY_FS_USE_NONE;
sbsec->behavior = SECURITY_FS_USE_NONE;
rc = 0;
} else {
*behavior = SECURITY_FS_USE_GENFS;
sbsec->behavior = SECURITY_FS_USE_GENFS;
}
}

455
security/selinux/xfrm.c
View File

@ -56,7 +56,7 @@
atomic_t selinux_xfrm_refcount = ATOMIC_INIT(0);
/*
* Returns true if an LSM/SELinux context
* Returns true if the context is an LSM/SELinux context.
*/
static inline int selinux_authorizable_ctx(struct xfrm_sec_ctx *ctx)
{
@ -66,7 +66,7 @@ static inline int selinux_authorizable_ctx(struct xfrm_sec_ctx *ctx)
}
/*
* Returns true if the xfrm contains a security blob for SELinux
* Returns true if the xfrm contains a security blob for SELinux.
*/
static inline int selinux_authorizable_xfrm(struct xfrm_state *x)
{
@ -74,48 +74,111 @@ static inline int selinux_authorizable_xfrm(struct xfrm_state *x)
}
/*
* LSM hook implementation that authorizes that a flow can use
* a xfrm policy rule.
* Allocates a xfrm_sec_state and populates it using the supplied security
* xfrm_user_sec_ctx context.
*/
static int selinux_xfrm_alloc_user(struct xfrm_sec_ctx **ctxp,
struct xfrm_user_sec_ctx *uctx)
{
int rc;
const struct task_security_struct *tsec = current_security();
struct xfrm_sec_ctx *ctx = NULL;
u32 str_len;
if (ctxp == NULL || uctx == NULL ||
uctx->ctx_doi != XFRM_SC_DOI_LSM ||
uctx->ctx_alg != XFRM_SC_ALG_SELINUX)
return -EINVAL;
str_len = uctx->ctx_len;
if (str_len >= PAGE_SIZE)
return -ENOMEM;
ctx = kmalloc(sizeof(*ctx) + str_len + 1, GFP_KERNEL);
if (!ctx)
return -ENOMEM;
ctx->ctx_doi = XFRM_SC_DOI_LSM;
ctx->ctx_alg = XFRM_SC_ALG_SELINUX;
ctx->ctx_len = str_len;
memcpy(ctx->ctx_str, &uctx[1], str_len);
ctx->ctx_str[str_len] = '\0';
rc = security_context_to_sid(ctx->ctx_str, str_len, &ctx->ctx_sid);
if (rc)
goto err;
rc = avc_has_perm(tsec->sid, ctx->ctx_sid,
SECCLASS_ASSOCIATION, ASSOCIATION__SETCONTEXT, NULL);
if (rc)
goto err;
*ctxp = ctx;
atomic_inc(&selinux_xfrm_refcount);
return 0;
err:
kfree(ctx);
return rc;
}
/*
* Free the xfrm_sec_ctx structure.
*/
static void selinux_xfrm_free(struct xfrm_sec_ctx *ctx)
{
if (!ctx)
return;
atomic_dec(&selinux_xfrm_refcount);
kfree(ctx);
}
/*
* Authorize the deletion of a labeled SA or policy rule.
*/
static int selinux_xfrm_delete(struct xfrm_sec_ctx *ctx)
{
const struct task_security_struct *tsec = current_security();
if (!ctx)
return 0;
return avc_has_perm(tsec->sid, ctx->ctx_sid,
SECCLASS_ASSOCIATION, ASSOCIATION__SETCONTEXT,
NULL);
}
/*
* LSM hook implementation that authorizes that a flow can use a xfrm policy
* rule.
*/
int selinux_xfrm_policy_lookup(struct xfrm_sec_ctx *ctx, u32 fl_secid, u8 dir)
{
int rc;
u32 sel_sid;
/* Context sid is either set to label or ANY_ASSOC */
if (ctx) {
if (!selinux_authorizable_ctx(ctx))
return -EINVAL;
sel_sid = ctx->ctx_sid;
} else
/*
* All flows should be treated as polmatch'ing an
* otherwise applicable "non-labeled" policy. This
* would prevent inadvertent "leaks".
*/
/* All flows should be treated as polmatch'ing an otherwise applicable
* "non-labeled" policy. This would prevent inadvertent "leaks". */
if (!ctx)
return 0;
rc = avc_has_perm(fl_secid, sel_sid, SECCLASS_ASSOCIATION,
ASSOCIATION__POLMATCH,
NULL);
/* Context sid is either set to label or ANY_ASSOC */
if (!selinux_authorizable_ctx(ctx))
return -EINVAL;
if (rc == -EACCES)
return -ESRCH;
return rc;
rc = avc_has_perm(fl_secid, ctx->ctx_sid,
SECCLASS_ASSOCIATION, ASSOCIATION__POLMATCH, NULL);
return (rc == -EACCES ? -ESRCH : rc);
}
/*
* LSM hook implementation that authorizes that a state matches
* the given policy, flow combo.
*/
int selinux_xfrm_state_pol_flow_match(struct xfrm_state *x, struct xfrm_policy *xp,
const struct flowi *fl)
int selinux_xfrm_state_pol_flow_match(struct xfrm_state *x,
struct xfrm_policy *xp,
const struct flowi *fl)
{
u32 state_sid;
int rc;
if (!xp->security)
if (x->security)
@ -138,187 +201,80 @@ int selinux_xfrm_state_pol_flow_match(struct xfrm_state *x, struct xfrm_policy *
if (fl->flowi_secid != state_sid)
return 0;
rc = avc_has_perm(fl->flowi_secid, state_sid, SECCLASS_ASSOCIATION,
ASSOCIATION__SENDTO,
NULL)? 0:1;
/*
* We don't need a separate SA Vs. policy polmatch check
* since the SA is now of the same label as the flow and
* a flow Vs. policy polmatch check had already happened
* in selinux_xfrm_policy_lookup() above.
*/
return rc;
/* We don't need a separate SA Vs. policy polmatch check since the SA
* is now of the same label as the flow and a flow Vs. policy polmatch
* check had already happened in selinux_xfrm_policy_lookup() above. */
return (avc_has_perm(fl->flowi_secid, state_sid,
SECCLASS_ASSOCIATION, ASSOCIATION__SENDTO,
NULL) ? 0 : 1);
}
/*
* LSM hook implementation that checks and/or returns the xfrm sid for the
* incoming packet.
*/
int selinux_xfrm_decode_session(struct sk_buff *skb, u32 *sid, int ckall)
{
u32 sid_session = SECSID_NULL;
struct sec_path *sp;
*sid = SECSID_NULL;
if (skb == NULL)
return 0;
goto out;
sp = skb->sp;
if (sp) {
int i, sid_set = 0;
int i;
for (i = sp->len-1; i >= 0; i--) {
for (i = sp->len - 1; i >= 0; i--) {
struct xfrm_state *x = sp->xvec[i];
if (selinux_authorizable_xfrm(x)) {
struct xfrm_sec_ctx *ctx = x->security;
if (!sid_set) {
*sid = ctx->ctx_sid;
sid_set = 1;
if (sid_session == SECSID_NULL) {
sid_session = ctx->ctx_sid;
if (!ckall)
break;
} else if (*sid != ctx->ctx_sid)
goto out;
} else if (sid_session != ctx->ctx_sid) {
*sid = SECSID_NULL;
return -EINVAL;
}
}
}
}
out:
*sid = sid_session;
return 0;
}
/*
* Security blob allocation for xfrm_policy and xfrm_state
* CTX does not have a meaningful value on input
*/
static int selinux_xfrm_sec_ctx_alloc(struct xfrm_sec_ctx **ctxp,
struct xfrm_user_sec_ctx *uctx, u32 sid)
{
int rc = 0;
const struct task_security_struct *tsec = current_security();
struct xfrm_sec_ctx *ctx = NULL;
char *ctx_str = NULL;
u32 str_len;
BUG_ON(uctx && sid);
if (!uctx)
goto not_from_user;
if (uctx->ctx_alg != XFRM_SC_ALG_SELINUX)
return -EINVAL;
str_len = uctx->ctx_len;
if (str_len >= PAGE_SIZE)
return -ENOMEM;
*ctxp = ctx = kmalloc(sizeof(*ctx) +
str_len + 1,
GFP_KERNEL);
if (!ctx)
return -ENOMEM;
ctx->ctx_doi = uctx->ctx_doi;
ctx->ctx_len = str_len;
ctx->ctx_alg = uctx->ctx_alg;
memcpy(ctx->ctx_str,
uctx+1,
str_len);
ctx->ctx_str[str_len] = 0;
rc = security_context_to_sid(ctx->ctx_str,
str_len,
&ctx->ctx_sid);
if (rc)
goto out;
/*
* Does the subject have permission to set security context?
*/
rc = avc_has_perm(tsec->sid, ctx->ctx_sid,
SECCLASS_ASSOCIATION,
ASSOCIATION__SETCONTEXT, NULL);
if (rc)
goto out;
return rc;
not_from_user:
rc = security_sid_to_context(sid, &ctx_str, &str_len);
if (rc)
goto out;
*ctxp = ctx = kmalloc(sizeof(*ctx) +
str_len,
GFP_ATOMIC);
if (!ctx) {
rc = -ENOMEM;
goto out;
}
ctx->ctx_doi = XFRM_SC_DOI_LSM;
ctx->ctx_alg = XFRM_SC_ALG_SELINUX;
ctx->ctx_sid = sid;
ctx->ctx_len = str_len;
memcpy(ctx->ctx_str,
ctx_str,
str_len);
goto out2;
out:
*ctxp = NULL;
kfree(ctx);
out2:
kfree(ctx_str);
return rc;
}
/*
* LSM hook implementation that allocs and transfers uctx spec to
* xfrm_policy.
* LSM hook implementation that allocs and transfers uctx spec to xfrm_policy.
*/
int selinux_xfrm_policy_alloc(struct xfrm_sec_ctx **ctxp,
struct xfrm_user_sec_ctx *uctx)
{
int err;
BUG_ON(!uctx);
err = selinux_xfrm_sec_ctx_alloc(ctxp, uctx, 0);
if (err == 0)
atomic_inc(&selinux_xfrm_refcount);
return err;
return selinux_xfrm_alloc_user(ctxp, uctx);
}
/*
* LSM hook implementation that copies security data structure from old to
* new for policy cloning.
* LSM hook implementation that copies security data structure from old to new
* for policy cloning.
*/
int selinux_xfrm_policy_clone(struct xfrm_sec_ctx *old_ctx,
struct xfrm_sec_ctx **new_ctxp)
{
struct xfrm_sec_ctx *new_ctx;
if (old_ctx) {
new_ctx = kmalloc(sizeof(*old_ctx) + old_ctx->ctx_len,
GFP_ATOMIC);
if (!new_ctx)
return -ENOMEM;
if (!old_ctx)
return 0;
new_ctx = kmemdup(old_ctx, sizeof(*old_ctx) + old_ctx->ctx_len,
GFP_ATOMIC);
if (!new_ctx)
return -ENOMEM;
atomic_inc(&selinux_xfrm_refcount);
*new_ctxp = new_ctx;
memcpy(new_ctx, old_ctx, sizeof(*new_ctx));
memcpy(new_ctx->ctx_str, old_ctx->ctx_str, new_ctx->ctx_len);
atomic_inc(&selinux_xfrm_refcount);
*new_ctxp = new_ctx;
}
return 0;
}
@ -327,8 +283,7 @@ int selinux_xfrm_policy_clone(struct xfrm_sec_ctx *old_ctx,
*/
void selinux_xfrm_policy_free(struct xfrm_sec_ctx *ctx)
{
atomic_dec(&selinux_xfrm_refcount);
kfree(ctx);
selinux_xfrm_free(ctx);
}
/*
@ -336,31 +291,55 @@ void selinux_xfrm_policy_free(struct xfrm_sec_ctx *ctx)
*/
int selinux_xfrm_policy_delete(struct xfrm_sec_ctx *ctx)
{
const struct task_security_struct *tsec = current_security();
if (!ctx)
return 0;
return avc_has_perm(tsec->sid, ctx->ctx_sid,
SECCLASS_ASSOCIATION, ASSOCIATION__SETCONTEXT,
NULL);
return selinux_xfrm_delete(ctx);
}
/*
* LSM hook implementation that allocs and transfers sec_ctx spec to
* xfrm_state.
* LSM hook implementation that allocates a xfrm_sec_state, populates it using
* the supplied security context, and assigns it to the xfrm_state.
*/
int selinux_xfrm_state_alloc(struct xfrm_state *x, struct xfrm_user_sec_ctx *uctx,
u32 secid)
int selinux_xfrm_state_alloc(struct xfrm_state *x,
struct xfrm_user_sec_ctx *uctx)
{
int err;
return selinux_xfrm_alloc_user(&x->security, uctx);
}
BUG_ON(!x);
/*
* LSM hook implementation that allocates a xfrm_sec_state and populates based
* on a secid.
*/
int selinux_xfrm_state_alloc_acquire(struct xfrm_state *x,
struct xfrm_sec_ctx *polsec, u32 secid)
{
int rc;
struct xfrm_sec_ctx *ctx;
char *ctx_str = NULL;
int str_len;
err = selinux_xfrm_sec_ctx_alloc(&x->security, uctx, secid);
if (err == 0)
atomic_inc(&selinux_xfrm_refcount);
return err;
if (!polsec)
return 0;
if (secid == 0)
return -EINVAL;
rc = security_sid_to_context(secid, &ctx_str, &str_len);
if (rc)
return rc;
ctx = kmalloc(sizeof(*ctx) + str_len, GFP_ATOMIC);
if (!ctx)
return -ENOMEM;
ctx->ctx_doi = XFRM_SC_DOI_LSM;
ctx->ctx_alg = XFRM_SC_ALG_SELINUX;
ctx->ctx_sid = secid;
ctx->ctx_len = str_len;
memcpy(ctx->ctx_str, ctx_str, str_len);
kfree(ctx_str);
x->security = ctx;
atomic_inc(&selinux_xfrm_refcount);
return 0;
}
/*
@ -368,24 +347,15 @@ int selinux_xfrm_state_alloc(struct xfrm_state *x, struct xfrm_user_sec_ctx *uct
*/
void selinux_xfrm_state_free(struct xfrm_state *x)
{
atomic_dec(&selinux_xfrm_refcount);
kfree(x->security);
selinux_xfrm_free(x->security);
}
/*
* LSM hook implementation that authorizes deletion of labeled SAs.
*/
/*
* LSM hook implementation that authorizes deletion of labeled SAs.
*/
int selinux_xfrm_state_delete(struct xfrm_state *x)
{
const struct task_security_struct *tsec = current_security();
struct xfrm_sec_ctx *ctx = x->security;
if (!ctx)
return 0;
return avc_has_perm(tsec->sid, ctx->ctx_sid,
SECCLASS_ASSOCIATION, ASSOCIATION__SETCONTEXT,
NULL);
return selinux_xfrm_delete(x->security);
}
/*
@ -395,14 +365,12 @@ int selinux_xfrm_state_delete(struct xfrm_state *x)
* we need to check for unlabelled access since this may not have
* gone thru the IPSec process.
*/
int selinux_xfrm_sock_rcv_skb(u32 isec_sid, struct sk_buff *skb,
struct common_audit_data *ad)
int selinux_xfrm_sock_rcv_skb(u32 sk_sid, struct sk_buff *skb,
struct common_audit_data *ad)
{
int i, rc = 0;
struct sec_path *sp;
u32 sel_sid = SECINITSID_UNLABELED;
sp = skb->sp;
int i;
struct sec_path *sp = skb->sp;
u32 peer_sid = SECINITSID_UNLABELED;
if (sp) {
for (i = 0; i < sp->len; i++) {
@ -410,23 +378,17 @@ int selinux_xfrm_sock_rcv_skb(u32 isec_sid, struct sk_buff *skb,
if (x && selinux_authorizable_xfrm(x)) {
struct xfrm_sec_ctx *ctx = x->security;
sel_sid = ctx->ctx_sid;
peer_sid = ctx->ctx_sid;
break;
}
}
}
/*
* This check even when there's no association involved is
* intended, according to Trent Jaeger, to make sure a
* process can't engage in non-ipsec communication unless
* explicitly allowed by policy.
*/
rc = avc_has_perm(isec_sid, sel_sid, SECCLASS_ASSOCIATION,
ASSOCIATION__RECVFROM, ad);
return rc;
/* This check even when there's no association involved is intended,
* according to Trent Jaeger, to make sure a process can't engage in
* non-IPsec communication unless explicitly allowed by policy. */
return avc_has_perm(sk_sid, peer_sid,
SECCLASS_ASSOCIATION, ASSOCIATION__RECVFROM, ad);
}
/*
@ -436,49 +398,38 @@ int selinux_xfrm_sock_rcv_skb(u32 isec_sid, struct sk_buff *skb,
* If we do have a authorizable security association, then it has already been
* checked in the selinux_xfrm_state_pol_flow_match hook above.
*/
int selinux_xfrm_postroute_last(u32 isec_sid, struct sk_buff *skb,
struct common_audit_data *ad, u8 proto)
int selinux_xfrm_postroute_last(u32 sk_sid, struct sk_buff *skb,
struct common_audit_data *ad, u8 proto)
{
struct dst_entry *dst;
int rc = 0;
dst = skb_dst(skb);
if (dst) {
struct dst_entry *dst_test;
for (dst_test = dst; dst_test != NULL;
dst_test = dst_test->child) {
struct xfrm_state *x = dst_test->xfrm;
if (x && selinux_authorizable_xfrm(x))
goto out;
}
}
switch (proto) {
case IPPROTO_AH:
case IPPROTO_ESP:
case IPPROTO_COMP:
/*
* We should have already seen this packet once before
* it underwent xfrm(s). No need to subject it to the
* unlabeled check.
*/
goto out;
/* We should have already seen this packet once before it
* underwent xfrm(s). No need to subject it to the unlabeled
* check. */
return 0;
default:
break;
}
/*
* This check even when there's no association involved is
* intended, according to Trent Jaeger, to make sure a
* process can't engage in non-ipsec communication unless
* explicitly allowed by policy.
*/
dst = skb_dst(skb);
if (dst) {
struct dst_entry *iter;
rc = avc_has_perm(isec_sid, SECINITSID_UNLABELED, SECCLASS_ASSOCIATION,
ASSOCIATION__SENDTO, ad);
out:
return rc;
for (iter = dst; iter != NULL; iter = iter->child) {
struct xfrm_state *x = iter->xfrm;
if (x && selinux_authorizable_xfrm(x))
return 0;
}
}
/* This check even when there's no association involved is intended,
* according to Trent Jaeger, to make sure a process can't engage in
* non-IPsec communication unless explicitly allowed by policy. */
return avc_has_perm(sk_sid, SECINITSID_UNLABELED,
SECCLASS_ASSOCIATION, ASSOCIATION__SENDTO, ad);
}