![Fernando Carrijo](/assets/img/avatar_default.png)
Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Acked-by: Theodore Ts'o <tytso@mit.edu> Acked-by: Mark Fasheh <mfasheh@suse.com> Acked-by: David S. Miller <davem@davemloft.net> Cc: James Morris <jmorris@namei.org> Acked-by: Casey Schaufler <casey@schaufler-ca.com> Acked-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1225 lines
27 KiB
C
1225 lines
27 KiB
C
/*
|
|
* Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, version 2.
|
|
*
|
|
* Authors:
|
|
* Casey Schaufler <casey@schaufler-ca.com>
|
|
* Ahmed S. Darwish <darwish.07@gmail.com>
|
|
*
|
|
* Special thanks to the authors of selinuxfs.
|
|
*
|
|
* Karl MacMillan <kmacmillan@tresys.com>
|
|
* James Morris <jmorris@redhat.com>
|
|
*
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/security.h>
|
|
#include <linux/mutex.h>
|
|
#include <net/net_namespace.h>
|
|
#include <net/netlabel.h>
|
|
#include <net/cipso_ipv4.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/ctype.h>
|
|
#include <linux/audit.h>
|
|
#include "smack.h"
|
|
|
|
/*
|
|
* smackfs pseudo filesystem.
|
|
*/
|
|
|
|
enum smk_inos {
|
|
SMK_ROOT_INO = 2,
|
|
SMK_LOAD = 3, /* load policy */
|
|
SMK_CIPSO = 4, /* load label -> CIPSO mapping */
|
|
SMK_DOI = 5, /* CIPSO DOI */
|
|
SMK_DIRECT = 6, /* CIPSO level indicating direct label */
|
|
SMK_AMBIENT = 7, /* internet ambient label */
|
|
SMK_NETLBLADDR = 8, /* single label hosts */
|
|
SMK_ONLYCAP = 9, /* the only "capable" label */
|
|
};
|
|
|
|
/*
|
|
* List locks
|
|
*/
|
|
static DEFINE_MUTEX(smack_list_lock);
|
|
static DEFINE_MUTEX(smack_cipso_lock);
|
|
static DEFINE_MUTEX(smack_ambient_lock);
|
|
static DEFINE_MUTEX(smk_netlbladdr_lock);
|
|
|
|
/*
|
|
* This is the "ambient" label for network traffic.
|
|
* If it isn't somehow marked, use this.
|
|
* It can be reset via smackfs/ambient
|
|
*/
|
|
char *smack_net_ambient = smack_known_floor.smk_known;
|
|
|
|
/*
|
|
* This is the level in a CIPSO header that indicates a
|
|
* smack label is contained directly in the category set.
|
|
* It can be reset via smackfs/direct
|
|
*/
|
|
int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;
|
|
|
|
/*
|
|
* Unless a process is running with this label even
|
|
* having CAP_MAC_OVERRIDE isn't enough to grant
|
|
* privilege to violate MAC policy. If no label is
|
|
* designated (the NULL case) capabilities apply to
|
|
* everyone. It is expected that the hat (^) label
|
|
* will be used if any label is used.
|
|
*/
|
|
char *smack_onlycap;
|
|
|
|
/*
|
|
* Certain IP addresses may be designated as single label hosts.
|
|
* Packets are sent there unlabeled, but only from tasks that
|
|
* can write to the specified label.
|
|
*/
|
|
struct smk_netlbladdr *smack_netlbladdrs;
|
|
|
|
static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
|
|
struct smk_list_entry *smack_list;
|
|
|
|
#define SEQ_READ_FINISHED 1
|
|
|
|
/*
|
|
* Values for parsing cipso rules
|
|
* SMK_DIGITLEN: Length of a digit field in a rule.
|
|
* SMK_CIPSOMIN: Minimum possible cipso rule length.
|
|
* SMK_CIPSOMAX: Maximum possible cipso rule length.
|
|
*/
|
|
#define SMK_DIGITLEN 4
|
|
#define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN)
|
|
#define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN)
|
|
|
|
/*
|
|
* Values for parsing MAC rules
|
|
* SMK_ACCESS: Maximum possible combination of access permissions
|
|
* SMK_ACCESSLEN: Maximum length for a rule access field
|
|
* SMK_LOADLEN: Smack rule length
|
|
*/
|
|
#define SMK_ACCESS "rwxa"
|
|
#define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1)
|
|
#define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN)
|
|
|
|
/**
|
|
* smk_netlabel_audit_set - fill a netlbl_audit struct
|
|
* @nap: structure to fill
|
|
*/
|
|
static void smk_netlabel_audit_set(struct netlbl_audit *nap)
|
|
{
|
|
nap->loginuid = audit_get_loginuid(current);
|
|
nap->sessionid = audit_get_sessionid(current);
|
|
nap->secid = smack_to_secid(current_security());
|
|
}
|
|
|
|
/*
|
|
* Values for parsing single label host rules
|
|
* "1.2.3.4 X"
|
|
* "192.168.138.129/32 abcdefghijklmnopqrstuvw"
|
|
*/
|
|
#define SMK_NETLBLADDRMIN 9
|
|
#define SMK_NETLBLADDRMAX 42
|
|
|
|
/*
|
|
* Seq_file read operations for /smack/load
|
|
*/
|
|
|
|
static void *load_seq_start(struct seq_file *s, loff_t *pos)
|
|
{
|
|
if (*pos == SEQ_READ_FINISHED)
|
|
return NULL;
|
|
|
|
return smack_list;
|
|
}
|
|
|
|
static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos)
|
|
{
|
|
struct smk_list_entry *skp = ((struct smk_list_entry *) v)->smk_next;
|
|
|
|
if (skp == NULL)
|
|
*pos = SEQ_READ_FINISHED;
|
|
|
|
return skp;
|
|
}
|
|
|
|
static int load_seq_show(struct seq_file *s, void *v)
|
|
{
|
|
struct smk_list_entry *slp = (struct smk_list_entry *) v;
|
|
struct smack_rule *srp = &slp->smk_rule;
|
|
|
|
seq_printf(s, "%s %s", (char *)srp->smk_subject,
|
|
(char *)srp->smk_object);
|
|
|
|
seq_putc(s, ' ');
|
|
|
|
if (srp->smk_access & MAY_READ)
|
|
seq_putc(s, 'r');
|
|
if (srp->smk_access & MAY_WRITE)
|
|
seq_putc(s, 'w');
|
|
if (srp->smk_access & MAY_EXEC)
|
|
seq_putc(s, 'x');
|
|
if (srp->smk_access & MAY_APPEND)
|
|
seq_putc(s, 'a');
|
|
if (srp->smk_access == 0)
|
|
seq_putc(s, '-');
|
|
|
|
seq_putc(s, '\n');
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void load_seq_stop(struct seq_file *s, void *v)
|
|
{
|
|
/* No-op */
|
|
}
|
|
|
|
static struct seq_operations load_seq_ops = {
|
|
.start = load_seq_start,
|
|
.next = load_seq_next,
|
|
.show = load_seq_show,
|
|
.stop = load_seq_stop,
|
|
};
|
|
|
|
/**
|
|
* smk_open_load - open() for /smack/load
|
|
* @inode: inode structure representing file
|
|
* @file: "load" file pointer
|
|
*
|
|
* For reading, use load_seq_* seq_file reading operations.
|
|
*/
|
|
static int smk_open_load(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &load_seq_ops);
|
|
}
|
|
|
|
/**
|
|
* smk_set_access - add a rule to the rule list
|
|
* @srp: the new rule to add
|
|
*
|
|
* Looks through the current subject/object/access list for
|
|
* the subject/object pair and replaces the access that was
|
|
* there. If the pair isn't found add it with the specified
|
|
* access.
|
|
*
|
|
* Returns 0 if nothing goes wrong or -ENOMEM if it fails
|
|
* during the allocation of the new pair to add.
|
|
*/
|
|
static int smk_set_access(struct smack_rule *srp)
|
|
{
|
|
struct smk_list_entry *sp;
|
|
struct smk_list_entry *newp;
|
|
int ret = 0;
|
|
|
|
mutex_lock(&smack_list_lock);
|
|
|
|
for (sp = smack_list; sp != NULL; sp = sp->smk_next)
|
|
if (sp->smk_rule.smk_subject == srp->smk_subject &&
|
|
sp->smk_rule.smk_object == srp->smk_object) {
|
|
sp->smk_rule.smk_access = srp->smk_access;
|
|
break;
|
|
}
|
|
|
|
if (sp == NULL) {
|
|
newp = kzalloc(sizeof(struct smk_list_entry), GFP_KERNEL);
|
|
if (newp == NULL) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
newp->smk_rule = *srp;
|
|
newp->smk_next = smack_list;
|
|
smack_list = newp;
|
|
}
|
|
|
|
out:
|
|
mutex_unlock(&smack_list_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* smk_write_load - write() for /smack/load
|
|
* @filp: file pointer, not actually used
|
|
* @buf: where to get the data from
|
|
* @count: bytes sent
|
|
* @ppos: where to start - must be 0
|
|
*
|
|
* Get one smack access rule from above.
|
|
* The format is exactly:
|
|
* char subject[SMK_LABELLEN]
|
|
* char object[SMK_LABELLEN]
|
|
* char access[SMK_ACCESSLEN]
|
|
*
|
|
* writes must be SMK_LABELLEN+SMK_LABELLEN+SMK_ACCESSLEN bytes.
|
|
*/
|
|
static ssize_t smk_write_load(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct smack_rule rule;
|
|
char *data;
|
|
int rc = -EINVAL;
|
|
|
|
/*
|
|
* Must have privilege.
|
|
* No partial writes.
|
|
* Enough data must be present.
|
|
*/
|
|
if (!capable(CAP_MAC_ADMIN))
|
|
return -EPERM;
|
|
if (*ppos != 0)
|
|
return -EINVAL;
|
|
if (count != SMK_LOADLEN)
|
|
return -EINVAL;
|
|
|
|
data = kzalloc(count, GFP_KERNEL);
|
|
if (data == NULL)
|
|
return -ENOMEM;
|
|
|
|
if (copy_from_user(data, buf, count) != 0) {
|
|
rc = -EFAULT;
|
|
goto out;
|
|
}
|
|
|
|
rule.smk_subject = smk_import(data, 0);
|
|
if (rule.smk_subject == NULL)
|
|
goto out;
|
|
|
|
rule.smk_object = smk_import(data + SMK_LABELLEN, 0);
|
|
if (rule.smk_object == NULL)
|
|
goto out;
|
|
|
|
rule.smk_access = 0;
|
|
|
|
switch (data[SMK_LABELLEN + SMK_LABELLEN]) {
|
|
case '-':
|
|
break;
|
|
case 'r':
|
|
case 'R':
|
|
rule.smk_access |= MAY_READ;
|
|
break;
|
|
default:
|
|
goto out;
|
|
}
|
|
|
|
switch (data[SMK_LABELLEN + SMK_LABELLEN + 1]) {
|
|
case '-':
|
|
break;
|
|
case 'w':
|
|
case 'W':
|
|
rule.smk_access |= MAY_WRITE;
|
|
break;
|
|
default:
|
|
goto out;
|
|
}
|
|
|
|
switch (data[SMK_LABELLEN + SMK_LABELLEN + 2]) {
|
|
case '-':
|
|
break;
|
|
case 'x':
|
|
case 'X':
|
|
rule.smk_access |= MAY_EXEC;
|
|
break;
|
|
default:
|
|
goto out;
|
|
}
|
|
|
|
switch (data[SMK_LABELLEN + SMK_LABELLEN + 3]) {
|
|
case '-':
|
|
break;
|
|
case 'a':
|
|
case 'A':
|
|
rule.smk_access |= MAY_READ;
|
|
break;
|
|
default:
|
|
goto out;
|
|
}
|
|
|
|
rc = smk_set_access(&rule);
|
|
|
|
if (!rc)
|
|
rc = count;
|
|
|
|
out:
|
|
kfree(data);
|
|
return rc;
|
|
}
|
|
|
|
static const struct file_operations smk_load_ops = {
|
|
.open = smk_open_load,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.write = smk_write_load,
|
|
.release = seq_release,
|
|
};
|
|
|
|
/**
|
|
* smk_cipso_doi - initialize the CIPSO domain
|
|
*/
|
|
static void smk_cipso_doi(void)
|
|
{
|
|
int rc;
|
|
struct cipso_v4_doi *doip;
|
|
struct netlbl_audit nai;
|
|
|
|
smk_netlabel_audit_set(&nai);
|
|
|
|
rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai);
|
|
if (rc != 0)
|
|
printk(KERN_WARNING "%s:%d remove rc = %d\n",
|
|
__func__, __LINE__, rc);
|
|
|
|
doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL);
|
|
if (doip == NULL)
|
|
panic("smack: Failed to initialize cipso DOI.\n");
|
|
doip->map.std = NULL;
|
|
doip->doi = smk_cipso_doi_value;
|
|
doip->type = CIPSO_V4_MAP_PASS;
|
|
doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
|
|
for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
|
|
doip->tags[rc] = CIPSO_V4_TAG_INVALID;
|
|
|
|
rc = netlbl_cfg_cipsov4_add(doip, &nai);
|
|
if (rc != 0) {
|
|
printk(KERN_WARNING "%s:%d cipso add rc = %d\n",
|
|
__func__, __LINE__, rc);
|
|
kfree(doip);
|
|
return;
|
|
}
|
|
rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai);
|
|
if (rc != 0) {
|
|
printk(KERN_WARNING "%s:%d map add rc = %d\n",
|
|
__func__, __LINE__, rc);
|
|
kfree(doip);
|
|
return;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* smk_unlbl_ambient - initialize the unlabeled domain
|
|
*/
|
|
static void smk_unlbl_ambient(char *oldambient)
|
|
{
|
|
int rc;
|
|
struct netlbl_audit nai;
|
|
|
|
smk_netlabel_audit_set(&nai);
|
|
|
|
if (oldambient != NULL) {
|
|
rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai);
|
|
if (rc != 0)
|
|
printk(KERN_WARNING "%s:%d remove rc = %d\n",
|
|
__func__, __LINE__, rc);
|
|
}
|
|
|
|
rc = netlbl_cfg_unlbl_map_add(smack_net_ambient, PF_INET,
|
|
NULL, NULL, &nai);
|
|
if (rc != 0)
|
|
printk(KERN_WARNING "%s:%d add rc = %d\n",
|
|
__func__, __LINE__, rc);
|
|
}
|
|
|
|
/*
|
|
* Seq_file read operations for /smack/cipso
|
|
*/
|
|
|
|
static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
|
|
{
|
|
if (*pos == SEQ_READ_FINISHED)
|
|
return NULL;
|
|
|
|
return smack_known;
|
|
}
|
|
|
|
static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
|
|
{
|
|
struct smack_known *skp = ((struct smack_known *) v)->smk_next;
|
|
|
|
/*
|
|
* Omit labels with no associated cipso value
|
|
*/
|
|
while (skp != NULL && !skp->smk_cipso)
|
|
skp = skp->smk_next;
|
|
|
|
if (skp == NULL)
|
|
*pos = SEQ_READ_FINISHED;
|
|
|
|
return skp;
|
|
}
|
|
|
|
/*
|
|
* Print cipso labels in format:
|
|
* label level[/cat[,cat]]
|
|
*/
|
|
static int cipso_seq_show(struct seq_file *s, void *v)
|
|
{
|
|
struct smack_known *skp = (struct smack_known *) v;
|
|
struct smack_cipso *scp = skp->smk_cipso;
|
|
char *cbp;
|
|
char sep = '/';
|
|
int cat = 1;
|
|
int i;
|
|
unsigned char m;
|
|
|
|
if (scp == NULL)
|
|
return 0;
|
|
|
|
seq_printf(s, "%s %3d", (char *)&skp->smk_known, scp->smk_level);
|
|
|
|
cbp = scp->smk_catset;
|
|
for (i = 0; i < SMK_LABELLEN; i++)
|
|
for (m = 0x80; m != 0; m >>= 1) {
|
|
if (m & cbp[i]) {
|
|
seq_printf(s, "%c%d", sep, cat);
|
|
sep = ',';
|
|
}
|
|
cat++;
|
|
}
|
|
|
|
seq_putc(s, '\n');
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void cipso_seq_stop(struct seq_file *s, void *v)
|
|
{
|
|
/* No-op */
|
|
}
|
|
|
|
static struct seq_operations cipso_seq_ops = {
|
|
.start = cipso_seq_start,
|
|
.stop = cipso_seq_stop,
|
|
.next = cipso_seq_next,
|
|
.show = cipso_seq_show,
|
|
};
|
|
|
|
/**
|
|
* smk_open_cipso - open() for /smack/cipso
|
|
* @inode: inode structure representing file
|
|
* @file: "cipso" file pointer
|
|
*
|
|
* Connect our cipso_seq_* operations with /smack/cipso
|
|
* file_operations
|
|
*/
|
|
static int smk_open_cipso(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &cipso_seq_ops);
|
|
}
|
|
|
|
/**
|
|
* smk_write_cipso - write() for /smack/cipso
|
|
* @filp: file pointer, not actually used
|
|
* @buf: where to get the data from
|
|
* @count: bytes sent
|
|
* @ppos: where to start
|
|
*
|
|
* Accepts only one cipso rule per write call.
|
|
* Returns number of bytes written or error code, as appropriate
|
|
*/
|
|
static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct smack_known *skp;
|
|
struct smack_cipso *scp = NULL;
|
|
char mapcatset[SMK_LABELLEN];
|
|
int maplevel;
|
|
int cat;
|
|
int catlen;
|
|
ssize_t rc = -EINVAL;
|
|
char *data = NULL;
|
|
char *rule;
|
|
int ret;
|
|
int i;
|
|
|
|
/*
|
|
* Must have privilege.
|
|
* No partial writes.
|
|
* Enough data must be present.
|
|
*/
|
|
if (!capable(CAP_MAC_ADMIN))
|
|
return -EPERM;
|
|
if (*ppos != 0)
|
|
return -EINVAL;
|
|
if (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX)
|
|
return -EINVAL;
|
|
|
|
data = kzalloc(count + 1, GFP_KERNEL);
|
|
if (data == NULL)
|
|
return -ENOMEM;
|
|
|
|
if (copy_from_user(data, buf, count) != 0) {
|
|
rc = -EFAULT;
|
|
goto unlockedout;
|
|
}
|
|
|
|
data[count] = '\0';
|
|
rule = data;
|
|
/*
|
|
* Only allow one writer at a time. Writes should be
|
|
* quite rare and small in any case.
|
|
*/
|
|
mutex_lock(&smack_cipso_lock);
|
|
|
|
skp = smk_import_entry(rule, 0);
|
|
if (skp == NULL)
|
|
goto out;
|
|
|
|
rule += SMK_LABELLEN;
|
|
ret = sscanf(rule, "%d", &maplevel);
|
|
if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL)
|
|
goto out;
|
|
|
|
rule += SMK_DIGITLEN;
|
|
ret = sscanf(rule, "%d", &catlen);
|
|
if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM)
|
|
goto out;
|
|
|
|
if (count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN))
|
|
goto out;
|
|
|
|
memset(mapcatset, 0, sizeof(mapcatset));
|
|
|
|
for (i = 0; i < catlen; i++) {
|
|
rule += SMK_DIGITLEN;
|
|
ret = sscanf(rule, "%d", &cat);
|
|
if (ret != 1 || cat > SMACK_CIPSO_MAXCATVAL)
|
|
goto out;
|
|
|
|
smack_catset_bit(cat, mapcatset);
|
|
}
|
|
|
|
if (skp->smk_cipso == NULL) {
|
|
scp = kzalloc(sizeof(struct smack_cipso), GFP_KERNEL);
|
|
if (scp == NULL) {
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
spin_lock_bh(&skp->smk_cipsolock);
|
|
|
|
if (scp == NULL)
|
|
scp = skp->smk_cipso;
|
|
else
|
|
skp->smk_cipso = scp;
|
|
|
|
scp->smk_level = maplevel;
|
|
memcpy(scp->smk_catset, mapcatset, sizeof(mapcatset));
|
|
|
|
spin_unlock_bh(&skp->smk_cipsolock);
|
|
|
|
rc = count;
|
|
out:
|
|
mutex_unlock(&smack_cipso_lock);
|
|
unlockedout:
|
|
kfree(data);
|
|
return rc;
|
|
}
|
|
|
|
static const struct file_operations smk_cipso_ops = {
|
|
.open = smk_open_cipso,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.write = smk_write_cipso,
|
|
.release = seq_release,
|
|
};
|
|
|
|
/*
|
|
* Seq_file read operations for /smack/netlabel
|
|
*/
|
|
|
|
static void *netlbladdr_seq_start(struct seq_file *s, loff_t *pos)
|
|
{
|
|
if (*pos == SEQ_READ_FINISHED)
|
|
return NULL;
|
|
|
|
return smack_netlbladdrs;
|
|
}
|
|
|
|
static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos)
|
|
{
|
|
struct smk_netlbladdr *skp = ((struct smk_netlbladdr *) v)->smk_next;
|
|
|
|
if (skp == NULL)
|
|
*pos = SEQ_READ_FINISHED;
|
|
|
|
return skp;
|
|
}
|
|
/*
|
|
#define BEMASK 0x80000000
|
|
*/
|
|
#define BEMASK 0x00000001
|
|
#define BEBITS (sizeof(__be32) * 8)
|
|
|
|
/*
|
|
* Print host/label pairs
|
|
*/
|
|
static int netlbladdr_seq_show(struct seq_file *s, void *v)
|
|
{
|
|
struct smk_netlbladdr *skp = (struct smk_netlbladdr *) v;
|
|
unsigned char *hp = (char *) &skp->smk_host.sin_addr.s_addr;
|
|
__be32 bebits;
|
|
int maskn = 0;
|
|
|
|
for (bebits = BEMASK; bebits != 0; maskn++, bebits <<= 1)
|
|
if ((skp->smk_mask.s_addr & bebits) == 0)
|
|
break;
|
|
|
|
seq_printf(s, "%u.%u.%u.%u/%d %s\n",
|
|
hp[0], hp[1], hp[2], hp[3], maskn, skp->smk_label);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void netlbladdr_seq_stop(struct seq_file *s, void *v)
|
|
{
|
|
/* No-op */
|
|
}
|
|
|
|
static struct seq_operations netlbladdr_seq_ops = {
|
|
.start = netlbladdr_seq_start,
|
|
.stop = netlbladdr_seq_stop,
|
|
.next = netlbladdr_seq_next,
|
|
.show = netlbladdr_seq_show,
|
|
};
|
|
|
|
/**
|
|
* smk_open_netlbladdr - open() for /smack/netlabel
|
|
* @inode: inode structure representing file
|
|
* @file: "netlabel" file pointer
|
|
*
|
|
* Connect our netlbladdr_seq_* operations with /smack/netlabel
|
|
* file_operations
|
|
*/
|
|
static int smk_open_netlbladdr(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &netlbladdr_seq_ops);
|
|
}
|
|
|
|
/**
|
|
* smk_write_netlbladdr - write() for /smack/netlabel
|
|
* @filp: file pointer, not actually used
|
|
* @buf: where to get the data from
|
|
* @count: bytes sent
|
|
* @ppos: where to start
|
|
*
|
|
* Accepts only one netlbladdr per write call.
|
|
* Returns number of bytes written or error code, as appropriate
|
|
*/
|
|
static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct smk_netlbladdr *skp;
|
|
struct sockaddr_in newname;
|
|
char smack[SMK_LABELLEN];
|
|
char *sp;
|
|
char data[SMK_NETLBLADDRMAX];
|
|
char *host = (char *)&newname.sin_addr.s_addr;
|
|
int rc;
|
|
struct netlbl_audit audit_info;
|
|
struct in_addr mask;
|
|
unsigned int m;
|
|
__be32 bebits = BEMASK;
|
|
__be32 nsa;
|
|
|
|
/*
|
|
* Must have privilege.
|
|
* No partial writes.
|
|
* Enough data must be present.
|
|
* "<addr/mask, as a.b.c.d/e><space><label>"
|
|
* "<addr, as a.b.c.d><space><label>"
|
|
*/
|
|
if (!capable(CAP_MAC_ADMIN))
|
|
return -EPERM;
|
|
if (*ppos != 0)
|
|
return -EINVAL;
|
|
if (count < SMK_NETLBLADDRMIN || count > SMK_NETLBLADDRMAX)
|
|
return -EINVAL;
|
|
if (copy_from_user(data, buf, count) != 0)
|
|
return -EFAULT;
|
|
|
|
data[count] = '\0';
|
|
|
|
rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%d %s",
|
|
&host[0], &host[1], &host[2], &host[3], &m, smack);
|
|
if (rc != 6) {
|
|
rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s",
|
|
&host[0], &host[1], &host[2], &host[3], smack);
|
|
if (rc != 5)
|
|
return -EINVAL;
|
|
m = BEBITS;
|
|
}
|
|
if (m > BEBITS)
|
|
return -EINVAL;
|
|
|
|
sp = smk_import(smack, 0);
|
|
if (sp == NULL)
|
|
return -EINVAL;
|
|
|
|
for (mask.s_addr = 0; m > 0; m--) {
|
|
mask.s_addr |= bebits;
|
|
bebits <<= 1;
|
|
}
|
|
/*
|
|
* Only allow one writer at a time. Writes should be
|
|
* quite rare and small in any case.
|
|
*/
|
|
mutex_lock(&smk_netlbladdr_lock);
|
|
|
|
nsa = newname.sin_addr.s_addr;
|
|
for (skp = smack_netlbladdrs; skp != NULL; skp = skp->smk_next)
|
|
if (skp->smk_host.sin_addr.s_addr == nsa &&
|
|
skp->smk_mask.s_addr == mask.s_addr)
|
|
break;
|
|
|
|
smk_netlabel_audit_set(&audit_info);
|
|
|
|
if (skp == NULL) {
|
|
skp = kzalloc(sizeof(*skp), GFP_KERNEL);
|
|
if (skp == NULL)
|
|
rc = -ENOMEM;
|
|
else {
|
|
rc = 0;
|
|
skp->smk_host.sin_addr.s_addr = newname.sin_addr.s_addr;
|
|
skp->smk_mask.s_addr = mask.s_addr;
|
|
skp->smk_next = smack_netlbladdrs;
|
|
skp->smk_label = sp;
|
|
smack_netlbladdrs = skp;
|
|
}
|
|
} else {
|
|
rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
|
|
&skp->smk_host.sin_addr, &skp->smk_mask,
|
|
PF_INET, &audit_info);
|
|
skp->smk_label = sp;
|
|
}
|
|
|
|
/*
|
|
* Now tell netlabel about the single label nature of
|
|
* this host so that incoming packets get labeled.
|
|
*/
|
|
|
|
if (rc == 0)
|
|
rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
|
|
&skp->smk_host.sin_addr, &skp->smk_mask, PF_INET,
|
|
smack_to_secid(skp->smk_label), &audit_info);
|
|
|
|
if (rc == 0)
|
|
rc = count;
|
|
|
|
mutex_unlock(&smk_netlbladdr_lock);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static const struct file_operations smk_netlbladdr_ops = {
|
|
.open = smk_open_netlbladdr,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.write = smk_write_netlbladdr,
|
|
.release = seq_release,
|
|
};
|
|
|
|
/**
|
|
* smk_read_doi - read() for /smack/doi
|
|
* @filp: file pointer, not actually used
|
|
* @buf: where to put the result
|
|
* @count: maximum to send along
|
|
* @ppos: where to start
|
|
*
|
|
* Returns number of bytes read or error code, as appropriate
|
|
*/
|
|
static ssize_t smk_read_doi(struct file *filp, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char temp[80];
|
|
ssize_t rc;
|
|
|
|
if (*ppos != 0)
|
|
return 0;
|
|
|
|
sprintf(temp, "%d", smk_cipso_doi_value);
|
|
rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* smk_write_doi - write() for /smack/doi
|
|
* @filp: file pointer, not actually used
|
|
* @buf: where to get the data from
|
|
* @count: bytes sent
|
|
* @ppos: where to start
|
|
*
|
|
* Returns number of bytes written or error code, as appropriate
|
|
*/
|
|
static ssize_t smk_write_doi(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char temp[80];
|
|
int i;
|
|
|
|
if (!capable(CAP_MAC_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (count >= sizeof(temp) || count == 0)
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(temp, buf, count) != 0)
|
|
return -EFAULT;
|
|
|
|
temp[count] = '\0';
|
|
|
|
if (sscanf(temp, "%d", &i) != 1)
|
|
return -EINVAL;
|
|
|
|
smk_cipso_doi_value = i;
|
|
|
|
smk_cipso_doi();
|
|
|
|
return count;
|
|
}
|
|
|
|
static const struct file_operations smk_doi_ops = {
|
|
.read = smk_read_doi,
|
|
.write = smk_write_doi,
|
|
};
|
|
|
|
/**
|
|
* smk_read_direct - read() for /smack/direct
|
|
* @filp: file pointer, not actually used
|
|
* @buf: where to put the result
|
|
* @count: maximum to send along
|
|
* @ppos: where to start
|
|
*
|
|
* Returns number of bytes read or error code, as appropriate
|
|
*/
|
|
static ssize_t smk_read_direct(struct file *filp, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char temp[80];
|
|
ssize_t rc;
|
|
|
|
if (*ppos != 0)
|
|
return 0;
|
|
|
|
sprintf(temp, "%d", smack_cipso_direct);
|
|
rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* smk_write_direct - write() for /smack/direct
|
|
* @filp: file pointer, not actually used
|
|
* @buf: where to get the data from
|
|
* @count: bytes sent
|
|
* @ppos: where to start
|
|
*
|
|
* Returns number of bytes written or error code, as appropriate
|
|
*/
|
|
static ssize_t smk_write_direct(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char temp[80];
|
|
int i;
|
|
|
|
if (!capable(CAP_MAC_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (count >= sizeof(temp) || count == 0)
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(temp, buf, count) != 0)
|
|
return -EFAULT;
|
|
|
|
temp[count] = '\0';
|
|
|
|
if (sscanf(temp, "%d", &i) != 1)
|
|
return -EINVAL;
|
|
|
|
smack_cipso_direct = i;
|
|
|
|
return count;
|
|
}
|
|
|
|
static const struct file_operations smk_direct_ops = {
|
|
.read = smk_read_direct,
|
|
.write = smk_write_direct,
|
|
};
|
|
|
|
/**
|
|
* smk_read_ambient - read() for /smack/ambient
|
|
* @filp: file pointer, not actually used
|
|
* @buf: where to put the result
|
|
* @cn: maximum to send along
|
|
* @ppos: where to start
|
|
*
|
|
* Returns number of bytes read or error code, as appropriate
|
|
*/
|
|
static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
|
|
size_t cn, loff_t *ppos)
|
|
{
|
|
ssize_t rc;
|
|
int asize;
|
|
|
|
if (*ppos != 0)
|
|
return 0;
|
|
/*
|
|
* Being careful to avoid a problem in the case where
|
|
* smack_net_ambient gets changed in midstream.
|
|
*/
|
|
mutex_lock(&smack_ambient_lock);
|
|
|
|
asize = strlen(smack_net_ambient) + 1;
|
|
|
|
if (cn >= asize)
|
|
rc = simple_read_from_buffer(buf, cn, ppos,
|
|
smack_net_ambient, asize);
|
|
else
|
|
rc = -EINVAL;
|
|
|
|
mutex_unlock(&smack_ambient_lock);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* smk_write_ambient - write() for /smack/ambient
|
|
* @filp: file pointer, not actually used
|
|
* @buf: where to get the data from
|
|
* @count: bytes sent
|
|
* @ppos: where to start
|
|
*
|
|
* Returns number of bytes written or error code, as appropriate
|
|
*/
|
|
static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char in[SMK_LABELLEN];
|
|
char *oldambient;
|
|
char *smack;
|
|
|
|
if (!capable(CAP_MAC_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (count >= SMK_LABELLEN)
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(in, buf, count) != 0)
|
|
return -EFAULT;
|
|
|
|
smack = smk_import(in, count);
|
|
if (smack == NULL)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&smack_ambient_lock);
|
|
|
|
oldambient = smack_net_ambient;
|
|
smack_net_ambient = smack;
|
|
smk_unlbl_ambient(oldambient);
|
|
|
|
mutex_unlock(&smack_ambient_lock);
|
|
|
|
return count;
|
|
}
|
|
|
|
static const struct file_operations smk_ambient_ops = {
|
|
.read = smk_read_ambient,
|
|
.write = smk_write_ambient,
|
|
};
|
|
|
|
/**
|
|
* smk_read_onlycap - read() for /smack/onlycap
|
|
* @filp: file pointer, not actually used
|
|
* @buf: where to put the result
|
|
* @cn: maximum to send along
|
|
* @ppos: where to start
|
|
*
|
|
* Returns number of bytes read or error code, as appropriate
|
|
*/
|
|
static ssize_t smk_read_onlycap(struct file *filp, char __user *buf,
|
|
size_t cn, loff_t *ppos)
|
|
{
|
|
char *smack = "";
|
|
ssize_t rc = -EINVAL;
|
|
int asize;
|
|
|
|
if (*ppos != 0)
|
|
return 0;
|
|
|
|
if (smack_onlycap != NULL)
|
|
smack = smack_onlycap;
|
|
|
|
asize = strlen(smack) + 1;
|
|
|
|
if (cn >= asize)
|
|
rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* smk_write_onlycap - write() for /smack/onlycap
|
|
* @filp: file pointer, not actually used
|
|
* @buf: where to get the data from
|
|
* @count: bytes sent
|
|
* @ppos: where to start
|
|
*
|
|
* Returns number of bytes written or error code, as appropriate
|
|
*/
|
|
static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char in[SMK_LABELLEN];
|
|
char *sp = current->cred->security;
|
|
|
|
if (!capable(CAP_MAC_ADMIN))
|
|
return -EPERM;
|
|
|
|
/*
|
|
* This can be done using smk_access() but is done
|
|
* explicitly for clarity. The smk_access() implementation
|
|
* would use smk_access(smack_onlycap, MAY_WRITE)
|
|
*/
|
|
if (smack_onlycap != NULL && smack_onlycap != sp)
|
|
return -EPERM;
|
|
|
|
if (count >= SMK_LABELLEN)
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(in, buf, count) != 0)
|
|
return -EFAULT;
|
|
|
|
/*
|
|
* Should the null string be passed in unset the onlycap value.
|
|
* This seems like something to be careful with as usually
|
|
* smk_import only expects to return NULL for errors. It
|
|
* is usually the case that a nullstring or "\n" would be
|
|
* bad to pass to smk_import but in fact this is useful here.
|
|
*/
|
|
smack_onlycap = smk_import(in, count);
|
|
|
|
return count;
|
|
}
|
|
|
|
static const struct file_operations smk_onlycap_ops = {
|
|
.read = smk_read_onlycap,
|
|
.write = smk_write_onlycap,
|
|
};
|
|
|
|
/**
|
|
* smk_fill_super - fill the /smackfs superblock
|
|
* @sb: the empty superblock
|
|
* @data: unused
|
|
* @silent: unused
|
|
*
|
|
* Fill in the well known entries for /smack
|
|
*
|
|
* Returns 0 on success, an error code on failure
|
|
*/
|
|
static int smk_fill_super(struct super_block *sb, void *data, int silent)
|
|
{
|
|
int rc;
|
|
struct inode *root_inode;
|
|
|
|
static struct tree_descr smack_files[] = {
|
|
[SMK_LOAD] =
|
|
{"load", &smk_load_ops, S_IRUGO|S_IWUSR},
|
|
[SMK_CIPSO] =
|
|
{"cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
|
|
[SMK_DOI] =
|
|
{"doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
|
|
[SMK_DIRECT] =
|
|
{"direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
|
|
[SMK_AMBIENT] =
|
|
{"ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
|
|
[SMK_NETLBLADDR] =
|
|
{"netlabel", &smk_netlbladdr_ops, S_IRUGO|S_IWUSR},
|
|
[SMK_ONLYCAP] =
|
|
{"onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
|
|
/* last one */ {""}
|
|
};
|
|
|
|
rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
|
|
if (rc != 0) {
|
|
printk(KERN_ERR "%s failed %d while creating inodes\n",
|
|
__func__, rc);
|
|
return rc;
|
|
}
|
|
|
|
root_inode = sb->s_root->d_inode;
|
|
root_inode->i_security = new_inode_smack(smack_known_floor.smk_known);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* smk_get_sb - get the smackfs superblock
|
|
* @fs_type: passed along without comment
|
|
* @flags: passed along without comment
|
|
* @dev_name: passed along without comment
|
|
* @data: passed along without comment
|
|
* @mnt: passed along without comment
|
|
*
|
|
* Just passes everything along.
|
|
*
|
|
* Returns what the lower level code does.
|
|
*/
|
|
static int smk_get_sb(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data,
|
|
struct vfsmount *mnt)
|
|
{
|
|
return get_sb_single(fs_type, flags, data, smk_fill_super, mnt);
|
|
}
|
|
|
|
static struct file_system_type smk_fs_type = {
|
|
.name = "smackfs",
|
|
.get_sb = smk_get_sb,
|
|
.kill_sb = kill_litter_super,
|
|
};
|
|
|
|
static struct vfsmount *smackfs_mount;
|
|
|
|
/**
|
|
* init_smk_fs - get the smackfs superblock
|
|
*
|
|
* register the smackfs
|
|
*
|
|
* Do not register smackfs if Smack wasn't enabled
|
|
* on boot. We can not put this method normally under the
|
|
* smack_init() code path since the security subsystem get
|
|
* initialized before the vfs caches.
|
|
*
|
|
* Returns true if we were not chosen on boot or if
|
|
* we were chosen and filesystem registration succeeded.
|
|
*/
|
|
static int __init init_smk_fs(void)
|
|
{
|
|
int err;
|
|
|
|
if (!security_module_enable(&smack_ops))
|
|
return 0;
|
|
|
|
err = register_filesystem(&smk_fs_type);
|
|
if (!err) {
|
|
smackfs_mount = kern_mount(&smk_fs_type);
|
|
if (IS_ERR(smackfs_mount)) {
|
|
printk(KERN_ERR "smackfs: could not mount!\n");
|
|
err = PTR_ERR(smackfs_mount);
|
|
smackfs_mount = NULL;
|
|
}
|
|
}
|
|
|
|
smk_cipso_doi();
|
|
smk_unlbl_ambient(NULL);
|
|
|
|
return err;
|
|
}
|
|
|
|
__initcall(init_smk_fs);
|