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Message-ID: <20080821212709.7951.19232.stgit@flek.lan>
Date: Thu, 21 Aug 2008 17:27:09 -0400
From: Paul Moore <paul.moore@...com>
To: selinux@...ho.nsa.gov, netdev@...r.kernel.org,
linux-security-module@...r.kernel.org
Subject: [RFC PATCH v3 12/13] cipso: Add support for native local labeling and
fixup mapping names
This patch accomplishes two minor tasks: add a new tag type for local
labeling and rename the CIPSO_V4_MAP_STD define to CIPSO_V4_MAP_TRANS. The
first change allows CIPSO to support full LSM labels/contexts, not just
MLS attributes. The second change brings the mapping names inline with
what userspace is using, compatibility is preserved since we don't actually
change the value.
Signed-off-by: XXX
---
include/net/cipso_ipv4.h | 13 +++--
net/ipv4/cipso_ipv4.c | 107 ++++++++++++++++++++++++++++++++++----
net/ipv4/ip_options.c | 2 -
net/netlabel/netlabel_cipso_v4.c | 14 ++---
net/netlabel/netlabel_cipso_v4.h | 4 +
net/netlabel/netlabel_kapi.c | 4 +
6 files changed, 118 insertions(+), 26 deletions(-)
diff --git a/include/net/cipso_ipv4.h b/include/net/cipso_ipv4.h
index 811febf..9909774 100644
--- a/include/net/cipso_ipv4.h
+++ b/include/net/cipso_ipv4.h
@@ -45,7 +45,7 @@
/* known doi values */
#define CIPSO_V4_DOI_UNKNOWN 0x00000000
-/* tag types */
+/* standard tag types */
#define CIPSO_V4_TAG_INVALID 0
#define CIPSO_V4_TAG_RBITMAP 1
#define CIPSO_V4_TAG_ENUM 2
@@ -53,10 +53,14 @@
#define CIPSO_V4_TAG_PBITMAP 6
#define CIPSO_V4_TAG_FREEFORM 7
+/* non-standard tag types (tags > 127) */
+#define CIPSO_V4_TAG_LOCAL 128
+
/* doi mapping types */
#define CIPSO_V4_MAP_UNKNOWN 0
-#define CIPSO_V4_MAP_STD 1
+#define CIPSO_V4_MAP_TRANS 1
#define CIPSO_V4_MAP_PASS 2
+#define CIPSO_V4_MAP_LOCAL 3
/* limits */
#define CIPSO_V4_MAX_REM_LVLS 255
@@ -215,7 +219,7 @@ int cipso_v4_skbuff_setattr(struct sk_buff *skb,
int cipso_v4_skbuff_delattr(struct sk_buff *skb);
int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
struct netlbl_lsm_secattr *secattr);
-int cipso_v4_validate(unsigned char **option);
+int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option);
#else
static inline void cipso_v4_error(struct sk_buff *skb,
int error,
@@ -259,7 +263,8 @@ static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
return -ENOSYS;
}
-static inline int cipso_v4_validate(unsigned char **option)
+static inline int cipso_v4_validate(const struct sk_buff *skb,
+ unsigned char **option)
{
return -ENOSYS;
}
diff --git a/net/ipv4/cipso_ipv4.c b/net/ipv4/cipso_ipv4.c
index 8387ef4..cc77f12 100644
--- a/net/ipv4/cipso_ipv4.c
+++ b/net/ipv4/cipso_ipv4.c
@@ -109,6 +109,19 @@ int cipso_v4_rbm_strictvalid = 1;
* be omitted. */
#define CIPSO_V4_TAG_RNG_CAT_MAX 8
+/* Base length of the local tag (non-standard tag).
+ * Tag definition (may change between kernel versions)
+ *
+ * 0 8 16 24 32
+ * +----------+----------+----------+----------+
+ * | 10000000 | 00001000 | unused (zero fill) |
+ * +----------+----------+----------+----------+
+ * | 32-bit secid value (host byte order) |
+ * +----------+----------+----------+----------+
+ *
+ */
+#define CIPSO_V4_TAG_LOC_BLEN 8
+
/*
* Helper Functions
*/
@@ -467,6 +480,10 @@ int cipso_v4_doi_add(struct cipso_v4_doi *doi_def)
if (doi_def->type != CIPSO_V4_MAP_PASS)
return -EINVAL;
break;
+ case CIPSO_V4_TAG_LOCAL:
+ if (doi_def->type != CIPSO_V4_MAP_LOCAL)
+ return -EINVAL;
+ break;
default:
return -EINVAL;
}
@@ -502,7 +519,7 @@ void cipso_v4_doi_free(struct cipso_v4_doi *doi_def)
return;
switch (doi_def->type) {
- case CIPSO_V4_MAP_STD:
+ case CIPSO_V4_MAP_TRANS:
kfree(doi_def->map.std->lvl.cipso);
kfree(doi_def->map.std->lvl.local);
kfree(doi_def->map.std->cat.cipso);
@@ -673,7 +690,7 @@ static int cipso_v4_map_lvl_valid(const struct cipso_v4_doi *doi_def, u8 level)
switch (doi_def->type) {
case CIPSO_V4_MAP_PASS:
return 0;
- case CIPSO_V4_MAP_STD:
+ case CIPSO_V4_MAP_TRANS:
if (doi_def->map.std->lvl.cipso[level] < CIPSO_V4_INV_LVL)
return 0;
break;
@@ -702,7 +719,7 @@ static int cipso_v4_map_lvl_hton(const struct cipso_v4_doi *doi_def,
case CIPSO_V4_MAP_PASS:
*net_lvl = host_lvl;
return 0;
- case CIPSO_V4_MAP_STD:
+ case CIPSO_V4_MAP_TRANS:
if (host_lvl < doi_def->map.std->lvl.local_size &&
doi_def->map.std->lvl.local[host_lvl] < CIPSO_V4_INV_LVL) {
*net_lvl = doi_def->map.std->lvl.local[host_lvl];
@@ -736,7 +753,7 @@ static int cipso_v4_map_lvl_ntoh(const struct cipso_v4_doi *doi_def,
case CIPSO_V4_MAP_PASS:
*host_lvl = net_lvl;
return 0;
- case CIPSO_V4_MAP_STD:
+ case CIPSO_V4_MAP_TRANS:
map_tbl = doi_def->map.std;
if (net_lvl < map_tbl->lvl.cipso_size &&
map_tbl->lvl.cipso[net_lvl] < CIPSO_V4_INV_LVL) {
@@ -773,7 +790,7 @@ static int cipso_v4_map_cat_rbm_valid(const struct cipso_v4_doi *doi_def,
switch (doi_def->type) {
case CIPSO_V4_MAP_PASS:
return 0;
- case CIPSO_V4_MAP_STD:
+ case CIPSO_V4_MAP_TRANS:
cipso_cat_size = doi_def->map.std->cat.cipso_size;
cipso_array = doi_def->map.std->cat.cipso;
for (;;) {
@@ -821,7 +838,7 @@ static int cipso_v4_map_cat_rbm_hton(const struct cipso_v4_doi *doi_def,
u32 host_cat_size = 0;
u32 *host_cat_array = NULL;
- if (doi_def->type == CIPSO_V4_MAP_STD) {
+ if (doi_def->type == CIPSO_V4_MAP_TRANS) {
host_cat_size = doi_def->map.std->cat.local_size;
host_cat_array = doi_def->map.std->cat.local;
}
@@ -836,7 +853,7 @@ static int cipso_v4_map_cat_rbm_hton(const struct cipso_v4_doi *doi_def,
case CIPSO_V4_MAP_PASS:
net_spot = host_spot;
break;
- case CIPSO_V4_MAP_STD:
+ case CIPSO_V4_MAP_TRANS:
if (host_spot >= host_cat_size)
return -EPERM;
net_spot = host_cat_array[host_spot];
@@ -882,7 +899,7 @@ static int cipso_v4_map_cat_rbm_ntoh(const struct cipso_v4_doi *doi_def,
u32 net_cat_size = 0;
u32 *net_cat_array = NULL;
- if (doi_def->type == CIPSO_V4_MAP_STD) {
+ if (doi_def->type == CIPSO_V4_MAP_TRANS) {
net_cat_size = doi_def->map.std->cat.cipso_size;
net_cat_array = doi_def->map.std->cat.cipso;
}
@@ -902,7 +919,7 @@ static int cipso_v4_map_cat_rbm_ntoh(const struct cipso_v4_doi *doi_def,
case CIPSO_V4_MAP_PASS:
host_spot = net_spot;
break;
- case CIPSO_V4_MAP_STD:
+ case CIPSO_V4_MAP_TRANS:
if (net_spot >= net_cat_size)
return -EPERM;
host_spot = net_cat_array[net_spot];
@@ -1484,6 +1501,54 @@ static int cipso_v4_parsetag_rng(const struct cipso_v4_doi *doi_def,
}
/**
+ * cipso_v4_gentag_loc - Generate a CIPSO local tag (non-standard)
+ * @doi_def: the DOI definition
+ * @secattr: the security attributes
+ * @buffer: the option buffer
+ * @buffer_len: length of buffer in bytes
+ *
+ * Description:
+ * Generate a CIPSO option using the local tag. Returns the size of the tag
+ * on success, negative values on failure.
+ *
+ */
+static int cipso_v4_gentag_loc(const struct cipso_v4_doi *doi_def,
+ const struct netlbl_lsm_secattr *secattr,
+ unsigned char *buffer,
+ u32 buffer_len)
+{
+ if (!(secattr->flags & NETLBL_SECATTR_SECID))
+ return -EPERM;
+
+ buffer[0] = 0x80;
+ buffer[1] = 0x08;
+ *(u32 *)&buffer[4] = secattr->attr.secid;
+
+ return 8;
+}
+
+/**
+ * cipso_v4_parsetag_loc - Parse a CIPSO local tag
+ * @doi_def: the DOI definition
+ * @tag: the CIPSO tag
+ * @secattr: the security attributes
+ *
+ * Description:
+ * Parse a CIPSO local tag and return the security attributes in @secattr.
+ * Return zero on success, negatives values on failure.
+ *
+ */
+static int cipso_v4_parsetag_loc(const struct cipso_v4_doi *doi_def,
+ const unsigned char *tag,
+ struct netlbl_lsm_secattr *secattr)
+{
+ secattr->attr.secid = *(u32 *)&tag[4];
+ secattr->flags |= NETLBL_SECATTR_SECID;
+
+ return 0;
+}
+
+/**
* cipso_v4_validate - Validate a CIPSO option
* @option: the start of the option, on error it is set to point to the error
*
@@ -1502,7 +1567,7 @@ static int cipso_v4_parsetag_rng(const struct cipso_v4_doi *doi_def,
* that is unrecognized."
*
*/
-int cipso_v4_validate(unsigned char **option)
+int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option)
{
unsigned char *opt = *option;
unsigned char *tag;
@@ -1610,6 +1675,19 @@ int cipso_v4_validate(unsigned char **option)
goto validate_return_locked;
}
break;
+ case CIPSO_V4_TAG_LOCAL:
+ /* This is a non-standard tag that we only allow for
+ * local connections, so if the incoming interface is
+ * not the loopback device drop the packet. */
+ if (!(skb->dev->flags & IFF_LOOPBACK)) {
+ err_offset = opt_iter;
+ goto validate_return_locked;
+ }
+ if (tag_len != 8) {
+ err_offset = opt_iter + 1;
+ goto validate_return_locked;
+ }
+ break;
default:
err_offset = opt_iter;
goto validate_return_locked;
@@ -1712,6 +1790,12 @@ static int cipso_v4_genopt(unsigned char *buf, u32 buf_len,
&buf[CIPSO_V4_HDR_LEN],
buf_len - CIPSO_V4_HDR_LEN);
break;
+ case CIPSO_V4_TAG_LOCAL:
+ ret_val = cipso_v4_gentag_loc(doi_def,
+ secattr,
+ &buf[CIPSO_V4_HDR_LEN],
+ buf_len - CIPSO_V4_HDR_LEN);
+ break;
default:
return -EPERM;
}
@@ -1894,6 +1978,9 @@ static int cipso_v4_getattr(const unsigned char *cipso,
case CIPSO_V4_TAG_RANGE:
ret_val = cipso_v4_parsetag_rng(doi_def, &cipso[6], secattr);
break;
+ case CIPSO_V4_TAG_LOCAL:
+ ret_val = cipso_v4_parsetag_loc(doi_def, &cipso[6], secattr);
+ break;
}
if (ret_val == 0)
secattr->type = NETLBL_NLTYPE_CIPSOV4;
diff --git a/net/ipv4/ip_options.c b/net/ipv4/ip_options.c
index be3f18a..2c88da6 100644
--- a/net/ipv4/ip_options.c
+++ b/net/ipv4/ip_options.c
@@ -438,7 +438,7 @@ int ip_options_compile(struct net *net,
goto error;
}
opt->cipso = optptr - iph;
- if (cipso_v4_validate(&optptr)) {
+ if (cipso_v4_validate(skb, &optptr)) {
pp_ptr = optptr;
goto error;
}
diff --git a/net/netlabel/netlabel_cipso_v4.c b/net/netlabel/netlabel_cipso_v4.c
index 7eda219..a6dc5d1 100644
--- a/net/netlabel/netlabel_cipso_v4.c
+++ b/net/netlabel/netlabel_cipso_v4.c
@@ -132,9 +132,9 @@ static int netlbl_cipsov4_add_common(struct genl_info *info,
* @info: the Generic NETLINK info block
*
* Description:
- * Create a new CIPSO_V4_MAP_STD DOI definition based on the given ADD message
- * and add it to the CIPSO V4 engine. Return zero on success and non-zero on
- * error.
+ * Create a new CIPSO_V4_MAP_TRANS DOI definition based on the given ADD
+ * message and add it to the CIPSO V4 engine. Return zero on success and
+ * non-zero on error.
*
*/
static int netlbl_cipsov4_add_std(struct genl_info *info)
@@ -164,7 +164,7 @@ static int netlbl_cipsov4_add_std(struct genl_info *info)
ret_val = -ENOMEM;
goto add_std_failure;
}
- doi_def->type = CIPSO_V4_MAP_STD;
+ doi_def->type = CIPSO_V4_MAP_TRANS;
ret_val = netlbl_cipsov4_add_common(info, doi_def);
if (ret_val != 0)
@@ -393,8 +393,8 @@ static int netlbl_cipsov4_add(struct sk_buff *skb, struct genl_info *info)
type = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_MTYPE]);
switch (type) {
- case CIPSO_V4_MAP_STD:
- type_str = "std";
+ case CIPSO_V4_MAP_TRANS:
+ type_str = "trans";
ret_val = netlbl_cipsov4_add_std(info);
break;
case CIPSO_V4_MAP_PASS:
@@ -497,7 +497,7 @@ list_start:
nla_nest_end(ans_skb, nla_a);
switch (doi_def->type) {
- case CIPSO_V4_MAP_STD:
+ case CIPSO_V4_MAP_TRANS:
nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSLVLLST);
if (nla_a == NULL) {
ret_val = -ENOMEM;
diff --git a/net/netlabel/netlabel_cipso_v4.h b/net/netlabel/netlabel_cipso_v4.h
index 220cb9d..fb3957f 100644
--- a/net/netlabel/netlabel_cipso_v4.h
+++ b/net/netlabel/netlabel_cipso_v4.h
@@ -45,7 +45,7 @@
* NLBL_CIPSOV4_A_MTYPE
* NLBL_CIPSOV4_A_TAGLST
*
- * If using CIPSO_V4_MAP_STD the following attributes are required:
+ * If using CIPSO_V4_MAP_TRANS the following attributes are required:
*
* NLBL_CIPSOV4_A_MLSLVLLST
* NLBL_CIPSOV4_A_MLSCATLST
@@ -76,7 +76,7 @@
* NLBL_CIPSOV4_A_MTYPE
* NLBL_CIPSOV4_A_TAGLST
*
- * If using CIPSO_V4_MAP_STD the following attributes are required:
+ * If using CIPSO_V4_MAP_TRANS the following attributes are required:
*
* NLBL_CIPSOV4_A_MLSLVLLST
* NLBL_CIPSOV4_A_MLSCATLST
diff --git a/net/netlabel/netlabel_kapi.c b/net/netlabel/netlabel_kapi.c
index bf0e1b8..7b233da 100644
--- a/net/netlabel/netlabel_kapi.c
+++ b/net/netlabel/netlabel_kapi.c
@@ -157,8 +157,8 @@ cfg_cipsov4_add_map_return:
audit_info);
if (audit_buf != NULL) {
switch (doi_type) {
- case CIPSO_V4_MAP_STD:
- type_str = "std";
+ case CIPSO_V4_MAP_TRANS:
+ type_str = "trans";
break;
case CIPSO_V4_MAP_PASS:
type_str = "pass";
--
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