*
* This is an implementation of the CIPSO 2.2 protocol as specified in
* draft-ietf-cipso-ipsecurity-01.txt with additional tag types as found in
- * FIPS-188, copies of both documents can be found in the Documentation
- * directory. While CIPSO never became a full IETF RFC standard many vendors
+ * FIPS-188. While CIPSO never became a full IETF RFC standard many vendors
* have chosen to adopt the protocol and over the years it has become a
* de-facto standard for labeled networking.
*
+ * The CIPSO draft specification can be found in the kernel's Documentation
+ * directory as well as the following URL:
+ * http://netlabel.sourceforge.net/files/draft-ietf-cipso-ipsecurity-01.txt
+ * The FIPS-188 specification can be found at the following URL:
+ * http://www.itl.nist.gov/fipspubs/fip188.htm
+ *
* Author: Paul Moore <paul.moore@hp.com>
*
*/
#include <linux/spinlock.h>
#include <linux/string.h>
#include <linux/jhash.h>
+#include <linux/audit.h>
#include <net/ip.h>
#include <net/icmp.h>
#include <net/tcp.h>
/**
* cipso_v4_doi_add - Add a new DOI to the CIPSO protocol engine
* @doi_def: the DOI structure
+ * @audit_info: NetLabel audit information
*
* Description:
* The caller defines a new DOI for use by the CIPSO engine and calls this
* zero on success and non-zero on failure.
*
*/
-int cipso_v4_doi_add(struct cipso_v4_doi *doi_def)
+int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
+ struct netlbl_audit *audit_info)
{
+ int ret_val = -EINVAL;
u32 iter;
+ u32 doi;
+ u32 doi_type;
+ struct audit_buffer *audit_buf;
+
+ doi = doi_def->doi;
+ doi_type = doi_def->type;
if (doi_def == NULL || doi_def->doi == CIPSO_V4_DOI_UNKNOWN)
- return -EINVAL;
+ goto doi_add_return;
for (iter = 0; iter < CIPSO_V4_TAG_MAXCNT; iter++) {
switch (doi_def->tags[iter]) {
case CIPSO_V4_TAG_RBITMAP:
break;
case CIPSO_V4_TAG_RANGE:
- if (doi_def->type != CIPSO_V4_MAP_PASS)
- return -EINVAL;
- break;
- case CIPSO_V4_TAG_INVALID:
- if (iter == 0)
- return -EINVAL;
- break;
case CIPSO_V4_TAG_ENUM:
if (doi_def->type != CIPSO_V4_MAP_PASS)
- return -EINVAL;
+ goto doi_add_return;
break;
case CIPSO_V4_TAG_LOCAL:
if (doi_def->type != CIPSO_V4_MAP_LOCAL)
- return -EINVAL;
+ goto doi_add_return;
+ break;
+ case CIPSO_V4_TAG_INVALID:
+ if (iter == 0)
+ goto doi_add_return;
break;
default:
- return -EINVAL;
+ goto doi_add_return;
}
}
atomic_set(&doi_def->refcount, 1);
spin_lock(&cipso_v4_doi_list_lock);
- if (cipso_v4_doi_search(doi_def->doi) != NULL)
- goto doi_add_failure;
+ if (cipso_v4_doi_search(doi_def->doi) != NULL) {
+ spin_unlock(&cipso_v4_doi_list_lock);
+ ret_val = -EEXIST;
+ goto doi_add_return;
+ }
list_add_tail_rcu(&doi_def->list, &cipso_v4_doi_list);
spin_unlock(&cipso_v4_doi_list_lock);
+ ret_val = 0;
- return 0;
+doi_add_return:
+ audit_buf = netlbl_audit_start(AUDIT_MAC_CIPSOV4_ADD, audit_info);
+ if (audit_buf != NULL) {
+ const char *type_str;
+ switch (doi_type) {
+ case CIPSO_V4_MAP_TRANS:
+ type_str = "trans";
+ break;
+ case CIPSO_V4_MAP_PASS:
+ type_str = "pass";
+ break;
+ case CIPSO_V4_MAP_LOCAL:
+ type_str = "local";
+ break;
+ default:
+ type_str = "(unknown)";
+ }
+ audit_log_format(audit_buf,
+ " cipso_doi=%u cipso_type=%s res=%u",
+ doi, type_str, ret_val == 0 ? 1 : 0);
+ audit_log_end(audit_buf);
+ }
-doi_add_failure:
- spin_unlock(&cipso_v4_doi_list_lock);
- return -EEXIST;
+ return ret_val;
}
/**
*/
int cipso_v4_doi_remove(u32 doi, struct netlbl_audit *audit_info)
{
+ int ret_val;
struct cipso_v4_doi *doi_def;
+ struct audit_buffer *audit_buf;
spin_lock(&cipso_v4_doi_list_lock);
doi_def = cipso_v4_doi_search(doi);
if (doi_def == NULL) {
spin_unlock(&cipso_v4_doi_list_lock);
- return -ENOENT;
+ ret_val = -ENOENT;
+ goto doi_remove_return;
}
if (!atomic_dec_and_test(&doi_def->refcount)) {
spin_unlock(&cipso_v4_doi_list_lock);
- return -EBUSY;
+ ret_val = -EBUSY;
+ goto doi_remove_return;
}
list_del_rcu(&doi_def->list);
spin_unlock(&cipso_v4_doi_list_lock);
cipso_v4_cache_invalidate();
call_rcu(&doi_def->rcu, cipso_v4_doi_free_rcu);
+ ret_val = 0;
+
+doi_remove_return:
+ audit_buf = netlbl_audit_start(AUDIT_MAC_CIPSOV4_DEL, audit_info);
+ if (audit_buf != NULL) {
+ audit_log_format(audit_buf,
+ " cipso_doi=%u res=%u",
+ doi, ret_val == 0 ? 1 : 0);
+ audit_log_end(audit_buf);
+ }
- return 0;
+ return ret_val;
}
/**
}
/**
- * cipso_v4_sock_delattr - Delete the CIPSO option from a socket
- * @sk: the socket
+ * cipso_v4_req_setattr - Add a CIPSO option to a connection request socket
+ * @req: the connection request socket
+ * @doi_def: the CIPSO DOI to use
+ * @secattr: the specific security attributes of the socket
*
* Description:
- * Removes the CIPSO option from a socket, if present.
+ * Set the CIPSO option on the given socket using the DOI definition and
+ * security attributes passed to the function. Returns zero on success and
+ * negative values on failure.
*
*/
-void cipso_v4_sock_delattr(struct sock *sk)
+int cipso_v4_req_setattr(struct request_sock *req,
+ const struct cipso_v4_doi *doi_def,
+ const struct netlbl_lsm_secattr *secattr)
{
- u8 hdr_delta;
- struct ip_options *opt;
- struct inet_sock *sk_inet;
+ int ret_val = -EPERM;
+ unsigned char *buf = NULL;
+ u32 buf_len;
+ u32 opt_len;
+ struct ip_options *opt = NULL;
+ struct inet_request_sock *req_inet;
- sk_inet = inet_sk(sk);
- opt = sk_inet->opt;
- if (opt == NULL || opt->cipso == 0)
- return;
+ /* We allocate the maximum CIPSO option size here so we are probably
+ * being a little wasteful, but it makes our life _much_ easier later
+ * on and after all we are only talking about 40 bytes. */
+ buf_len = CIPSO_V4_OPT_LEN_MAX;
+ buf = kmalloc(buf_len, GFP_ATOMIC);
+ if (buf == NULL) {
+ ret_val = -ENOMEM;
+ goto req_setattr_failure;
+ }
+
+ ret_val = cipso_v4_genopt(buf, buf_len, doi_def, secattr);
+ if (ret_val < 0)
+ goto req_setattr_failure;
+ buf_len = ret_val;
+
+ /* We can't use ip_options_get() directly because it makes a call to
+ * ip_options_get_alloc() which allocates memory with GFP_KERNEL and
+ * we won't always have CAP_NET_RAW even though we _always_ want to
+ * set the IPOPT_CIPSO option. */
+ opt_len = (buf_len + 3) & ~3;
+ opt = kzalloc(sizeof(*opt) + opt_len, GFP_ATOMIC);
+ if (opt == NULL) {
+ ret_val = -ENOMEM;
+ goto req_setattr_failure;
+ }
+ memcpy(opt->__data, buf, buf_len);
+ opt->optlen = opt_len;
+ opt->cipso = sizeof(struct iphdr);
+ kfree(buf);
+ buf = NULL;
+
+ req_inet = inet_rsk(req);
+ opt = xchg(&req_inet->opt, opt);
+ kfree(opt);
+
+ return 0;
+
+req_setattr_failure:
+ kfree(buf);
+ kfree(opt);
+ return ret_val;
+}
+
+/**
+ * cipso_v4_delopt - Delete the CIPSO option from a set of IP options
+ * @opt_ptr: IP option pointer
+ *
+ * Description:
+ * Deletes the CIPSO IP option from a set of IP options and makes the necessary
+ * adjustments to the IP option structure. Returns zero on success, negative
+ * values on failure.
+ *
+ */
+static int cipso_v4_delopt(struct ip_options **opt_ptr)
+{
+ int hdr_delta = 0;
+ struct ip_options *opt = *opt_ptr;
if (opt->srr || opt->rr || opt->ts || opt->router_alert) {
u8 cipso_len;
} else {
/* only the cipso option was present on the socket so we can
* remove the entire option struct */
- sk_inet->opt = NULL;
+ *opt_ptr = NULL;
hdr_delta = opt->optlen;
kfree(opt);
}
+ return hdr_delta;
+}
+
+/**
+ * cipso_v4_sock_delattr - Delete the CIPSO option from a socket
+ * @sk: the socket
+ *
+ * Description:
+ * Removes the CIPSO option from a socket, if present.
+ *
+ */
+void cipso_v4_sock_delattr(struct sock *sk)
+{
+ int hdr_delta;
+ struct ip_options *opt;
+ struct inet_sock *sk_inet;
+
+ sk_inet = inet_sk(sk);
+ opt = sk_inet->opt;
+ if (opt == NULL || opt->cipso == 0)
+ return;
+
+ hdr_delta = cipso_v4_delopt(&sk_inet->opt);
if (sk_inet->is_icsk && hdr_delta > 0) {
struct inet_connection_sock *sk_conn = inet_csk(sk);
sk_conn->icsk_ext_hdr_len -= hdr_delta;
}
/**
+ * cipso_v4_req_delattr - Delete the CIPSO option from a request socket
+ * @reg: the request socket
+ *
+ * Description:
+ * Removes the CIPSO option from a request socket, if present.
+ *
+ */
+void cipso_v4_req_delattr(struct request_sock *req)
+{
+ struct ip_options *opt;
+ struct inet_request_sock *req_inet;
+
+ req_inet = inet_rsk(req);
+ opt = req_inet->opt;
+ if (opt == NULL || opt->cipso == 0)
+ return;
+
+ cipso_v4_delopt(&req_inet->opt);
+}
+
+/**
* cipso_v4_getattr - Helper function for the cipso_v4_*_getattr functions
* @cipso: the CIPSO v4 option
* @secattr: the security attributes
u32 opt_len;
int len_delta;
- buf_len = cipso_v4_genopt(buf, buf_len, doi_def, secattr);
- if (buf_len < 0)
- return buf_len;
+ ret_val = cipso_v4_genopt(buf, buf_len, doi_def, secattr);
+ if (ret_val < 0)
+ return ret_val;
+ buf_len = ret_val;
opt_len = (buf_len + 3) & ~3;
/* we overwrite any existing options to ensure that we have enough
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff