#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>
SMK_DOI = 5, /* CIPSO DOI */
SMK_DIRECT = 6, /* CIPSO level indicating direct label */
SMK_AMBIENT = 7, /* internet ambient label */
- SMK_NLTYPE = 8, /* label scheme to use by default */
+ SMK_NETLBLADDR = 8, /* single label hosts */
SMK_ONLYCAP = 9, /* the only "capable" label */
};
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.
*/
char *smack_net_ambient = smack_known_floor.smk_known;
-/*
- * This is the default packet marking scheme for network traffic.
- * It can be reset via smackfs/nltype
- */
-int smack_net_nltype = NETLBL_NLTYPE_CIPSOV4;
-
/*
* This is the level in a CIPSO header that indicates a
* smack label is contained directly in the category set.
*/
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 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
* 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 void smk_set_access(struct smack_rule *srp)
+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);
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;
+ return ret;
}
/**
break;
case 'a':
case 'A':
- rule.smk_access |= MAY_READ;
+ rule.smk_access |= MAY_APPEND;
break;
default:
goto out;
}
- smk_set_access(&rule);
- rc = count;
+ rc = smk_set_access(&rule);
+
+ if (!rc)
+ rc = count;
out:
kfree(data);
{
int rc;
struct cipso_v4_doi *doip;
- struct netlbl_audit audit_info;
+ struct netlbl_audit nai;
- audit_info.loginuid = audit_get_loginuid(current);
- audit_info.sessionid = audit_get_sessionid(current);
- audit_info.secid = smack_to_secid(current_security());
+ smk_netlabel_audit_set(&nai);
- rc = netlbl_cfg_map_del(NULL, &audit_info);
+ 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);
for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
doip->tags[rc] = CIPSO_V4_TAG_INVALID;
- rc = netlbl_cfg_cipsov4_add_map(doip, NULL, &audit_info);
+ rc = netlbl_cfg_cipsov4_add(doip, &nai);
if (rc != 0) {
- printk(KERN_WARNING "%s:%d add rc = %d\n",
+ 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;
}
}
static void smk_unlbl_ambient(char *oldambient)
{
int rc;
- struct netlbl_audit audit_info;
+ struct netlbl_audit nai;
- audit_info.loginuid = audit_get_loginuid(current);
- audit_info.sessionid = audit_get_sessionid(current);
- audit_info.secid = smack_to_secid(current_security());
+ smk_netlabel_audit_set(&nai);
if (oldambient != NULL) {
- rc = netlbl_cfg_map_del(oldambient, &audit_info);
+ 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_add_map(smack_net_ambient, &audit_info);
+ 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);
if (skp == NULL)
goto out;
- rule += SMK_LABELLEN;;
+ rule += SMK_LABELLEN;
ret = sscanf(rule, "%d", &maplevel);
if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL)
goto out;
.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
.write = smk_write_onlycap,
};
-struct option_names {
- int o_number;
- char *o_name;
- char *o_alias;
-};
-
-static struct option_names netlbl_choices[] = {
- { NETLBL_NLTYPE_RIPSO,
- NETLBL_NLTYPE_RIPSO_NAME, "ripso" },
- { NETLBL_NLTYPE_CIPSOV4,
- NETLBL_NLTYPE_CIPSOV4_NAME, "cipsov4" },
- { NETLBL_NLTYPE_CIPSOV4,
- NETLBL_NLTYPE_CIPSOV4_NAME, "cipso" },
- { NETLBL_NLTYPE_CIPSOV6,
- NETLBL_NLTYPE_CIPSOV6_NAME, "cipsov6" },
- { NETLBL_NLTYPE_UNLABELED,
- NETLBL_NLTYPE_UNLABELED_NAME, "unlabeled" },
-};
-
-/**
- * smk_read_nltype - read() for /smack/nltype
- * @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_nltype(struct file *filp, char __user *buf,
- size_t count, loff_t *ppos)
-{
- char bound[40];
- ssize_t rc;
- int i;
-
- if (count < SMK_LABELLEN)
- return -EINVAL;
-
- if (*ppos != 0)
- return 0;
-
- sprintf(bound, "unknown");
-
- for (i = 0; i < ARRAY_SIZE(netlbl_choices); i++)
- if (smack_net_nltype == netlbl_choices[i].o_number) {
- sprintf(bound, "%s", netlbl_choices[i].o_name);
- break;
- }
-
- rc = simple_read_from_buffer(buf, count, ppos, bound, strlen(bound));
-
- return rc;
-}
-
-/**
- * smk_write_nltype - write() for /smack/nltype
- * @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_nltype(struct file *file, const char __user *buf,
- size_t count, loff_t *ppos)
-{
- char bound[40];
- char *cp;
- int i;
-
- if (!capable(CAP_MAC_ADMIN))
- return -EPERM;
-
- if (count >= 40)
- return -EINVAL;
-
- if (copy_from_user(bound, buf, count) != 0)
- return -EFAULT;
-
- bound[count] = '\0';
- cp = strchr(bound, ' ');
- if (cp != NULL)
- *cp = '\0';
- cp = strchr(bound, '\n');
- if (cp != NULL)
- *cp = '\0';
-
- for (i = 0; i < ARRAY_SIZE(netlbl_choices); i++)
- if (strcmp(bound, netlbl_choices[i].o_name) == 0 ||
- strcmp(bound, netlbl_choices[i].o_alias) == 0) {
- smack_net_nltype = netlbl_choices[i].o_number;
- return count;
- }
- /*
- * Not a valid choice.
- */
- return -EINVAL;
-}
-
-static const struct file_operations smk_nltype_ops = {
- .read = smk_read_nltype,
- .write = smk_write_nltype,
-};
-
/**
* smk_fill_super - fill the /smackfs superblock
* @sb: the empty superblock
{"direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
[SMK_AMBIENT] =
{"ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
- [SMK_NLTYPE] =
- {"nltype", &smk_nltype_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 */ {""}
projects / linux-2.6-omap-h63xx.git / blobdiff