NetLabel: Add auditing to the static labeling mechanism

This patch adds auditing support to the NetLabel static labeling mechanism.

Signed-off-by: Paul Moore <paul.moore@hp.com>
Signed-off-by: James Morris <jmorris@namei.org>

2 files changed, 195 insertions, 14 deletions

diff --git a/include/linux/audit.h b/include/linux/audit.h
index c68781692838..bdd6f5de5fc4 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -115,6 +115,8 @@
 #define AUDIT_MAC_IPSEC_ADDSPD  1413    /* Not used */
 #define AUDIT_MAC_IPSEC_DELSPD  1414    /* Not used */
 #define AUDIT_MAC_IPSEC_EVENT   1415    /* Audit an IPSec event */
+#define AUDIT_MAC_UNLBL_STCADD  1416    /* NetLabel: add a static label */
+#define AUDIT_MAC_UNLBL_STCDEL  1417    /* NetLabel: del a static label */
 
 #define AUDIT_FIRST_KERN_ANOM_MSG   1700
 #define AUDIT_LAST_KERN_ANOM_MSG    1799
diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c
index d0c628c875ae..42e81fd8cc49 100644
--- a/net/netlabel/netlabel_unlabeled.c
+++ b/net/netlabel/netlabel_unlabeled.c
@@ -147,6 +147,74 @@ static const struct nla_policy netlbl_unlabel_genl_policy[NLBL_UNLABEL_A_MAX + 1
 };
 
 /*
+ * Audit Helper Functions
+ */
+
+/**
+ * netlbl_unlabel_audit_addr4 - Audit an IPv4 address
+ * @audit_buf: audit buffer
+ * @dev: network interface
+ * @addr: IP address
+ * @mask: IP address mask
+ *
+ * Description:
+ * Write the IPv4 address and address mask, if necessary, to @audit_buf.
+ *
+ */
+static void netlbl_unlabel_audit_addr4(struct audit_buffer *audit_buf,
+                                     const char *dev,
+                                     __be32 addr, __be32 mask)
+{
+        u32 mask_val = ntohl(mask);
+
+        if (dev != NULL)
+                audit_log_format(audit_buf, " netif=%s", dev);
+        audit_log_format(audit_buf, " src=" NIPQUAD_FMT, NIPQUAD(addr));
+        if (mask_val != 0xffffffff) {
+                u32 mask_len = 0;
+                while (mask_val > 0) {
+                        mask_val <<= 1;
+                        mask_len++;
+                }
+                audit_log_format(audit_buf, " src_prefixlen=%d", mask_len);
+        }
+}
+
+/**
+ * netlbl_unlabel_audit_addr6 - Audit an IPv6 address
+ * @audit_buf: audit buffer
+ * @dev: network interface
+ * @addr: IP address
+ * @mask: IP address mask
+ *
+ * Description:
+ * Write the IPv6 address and address mask, if necessary, to @audit_buf.
+ *
+ */
+static void netlbl_unlabel_audit_addr6(struct audit_buffer *audit_buf,
+                                     const char *dev,
+                                     const struct in6_addr *addr,
+                                     const struct in6_addr *mask)
+{
+        if (dev != NULL)
+                audit_log_format(audit_buf, " netif=%s", dev);
+        audit_log_format(audit_buf, " src=" NIP6_FMT, NIP6(*addr));
+        if (ntohl(mask->s6_addr32[3]) != 0xffffffff) {
+                u32 mask_len = 0;
+                u32 mask_val;
+                int iter = -1;
+                while (ntohl(mask->s6_addr32[++iter]) == 0xffffffff)
+                        mask_len += 32;
+                mask_val = ntohl(mask->s6_addr32[iter]);
+                while (mask_val > 0) {
+                        mask_val <<= 1;
+                        mask_len++;
+                }
+                audit_log_format(audit_buf, " src_prefixlen=%d", mask_len);
+        }
+}
+
+/*
  * Unlabeled Connection Hash Table Functions
  */
 
@@ -530,6 +598,7 @@ add_iface_failure:
  * @mask: address mask in network byte order
  * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6)
  * @secid: LSM secid value for the entry
+ * @audit_info: NetLabel audit information
  *
  * Description:
  * Adds a new entry to the unlabeled connection hash table.  Returns zero on
@@ -541,12 +610,18 @@ static int netlbl_unlhsh_add(struct net *net,
                              const void *addr,
                              const void *mask,
                              u32 addr_len,
-                             u32 secid)
+                             u32 secid,
+                             struct netlbl_audit *audit_info)
 {
         int ret_val;
         int ifindex;
         struct net_device *dev;
         struct netlbl_unlhsh_iface *iface;
+        struct in_addr *addr4, *mask4;
+        struct in6_addr *addr6, *mask6;
+        struct audit_buffer *audit_buf = NULL;
+        char *secctx = NULL;
+        u32 secctx_len;
 
         if (addr_len != sizeof(struct in_addr) &&
             addr_len != sizeof(struct in6_addr))
@@ -573,13 +648,28 @@ static int netlbl_unlhsh_add(struct net *net,
                         goto unlhsh_add_return;
                 }
         }
+        audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCADD,
+                                              audit_info);
         switch (addr_len) {
         case sizeof(struct in_addr):
-                ret_val = netlbl_unlhsh_add_addr4(iface, addr, mask, secid);
+                addr4 = (struct in_addr *)addr;
+                mask4 = (struct in_addr *)mask;
+                ret_val = netlbl_unlhsh_add_addr4(iface, addr4, mask4, secid);
+                if (audit_buf != NULL)
+                        netlbl_unlabel_audit_addr4(audit_buf,
+                                                   dev_name,
+                                                   addr4->s_addr,
+                                                   mask4->s_addr);
                 break;
 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
         case sizeof(struct in6_addr):
-                ret_val = netlbl_unlhsh_add_addr6(iface, addr, mask, secid);
+                addr6 = (struct in6_addr *)addr;
+                mask6 = (struct in6_addr *)mask;
+                ret_val = netlbl_unlhsh_add_addr6(iface, addr6, mask6, secid);
+                if (audit_buf != NULL)
+                        netlbl_unlabel_audit_addr6(audit_buf,
+                                                   dev_name,
+                                                   addr6, mask6);
                 break;
 #endif /* IPv6 */
         default:
@@ -590,14 +680,26 @@ static int netlbl_unlhsh_add(struct net *net,
 
 unlhsh_add_return:
         rcu_read_unlock();
+        if (audit_buf != NULL) {
+                if (security_secid_to_secctx(secid,
+                                             &secctx,
+                                             &secctx_len) == 0) {
+                        audit_log_format(audit_buf, " sec_obj=%s", secctx);
+                        security_release_secctx(secctx, secctx_len);
+                }
+                audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0);
+                audit_log_end(audit_buf);
+        }
         return ret_val;
 }
 
 /**
  * netlbl_unlhsh_remove_addr4 - Remove an IPv4 address entry
+ * @net: network namespace
  * @iface: interface entry
  * @addr: IP address
  * @mask: IP address mask
+ * @audit_info: NetLabel audit information
  *
  * Description:
  * Remove an IP address entry from the unlabeled connection hash table.
@@ -605,12 +707,18 @@ unlhsh_add_return:
  * responsible for calling the rcu_read_[un]lock() functions.
  *
  */
-static int netlbl_unlhsh_remove_addr4(struct netlbl_unlhsh_iface *iface,
+static int netlbl_unlhsh_remove_addr4(struct net *net,
+                                      struct netlbl_unlhsh_iface *iface,
                                       const struct in_addr *addr,
-                                      const struct in_addr *mask)
+                                      const struct in_addr *mask,
+                                      struct netlbl_audit *audit_info)
 {
         int ret_val = -ENOENT;
         struct netlbl_unlhsh_addr4 *entry;
+        struct audit_buffer *audit_buf = NULL;
+        struct net_device *dev;
+        char *secctx = NULL;
+        u32 secctx_len;
 
         spin_lock(&netlbl_unlhsh_lock);
         entry = netlbl_unlhsh_search_addr4(addr->s_addr, iface);
@@ -622,6 +730,25 @@ static int netlbl_unlhsh_remove_addr4(struct netlbl_unlhsh_iface *iface,
         }
         spin_unlock(&netlbl_unlhsh_lock);
 
+        audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL,
+                                              audit_info);
+        if (audit_buf != NULL) {
+                dev = dev_get_by_index(net, iface->ifindex);
+                netlbl_unlabel_audit_addr4(audit_buf,
+                                           (dev != NULL ? dev->name : NULL),
+                                           entry->addr, entry->mask);
+                if (dev != NULL)
+                        dev_put(dev);
+                if (security_secid_to_secctx(entry->secid,
+                                             &secctx,
+                                             &secctx_len) == 0) {
+                        audit_log_format(audit_buf, " sec_obj=%s", secctx);
+                        security_release_secctx(secctx, secctx_len);
+                }
+                audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0);
+                audit_log_end(audit_buf);
+        }
+
         if (ret_val == 0)
                 call_rcu(&entry->rcu, netlbl_unlhsh_free_addr4);
         return ret_val;
@@ -630,9 +757,11 @@ static int netlbl_unlhsh_remove_addr4(struct netlbl_unlhsh_iface *iface,
 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 /**
  * netlbl_unlhsh_remove_addr6 - Remove an IPv6 address entry
+ * @net: network namespace
  * @iface: interface entry
  * @addr: IP address
  * @mask: IP address mask
+ * @audit_info: NetLabel audit information
  *
  * Description:
  * Remove an IP address entry from the unlabeled connection hash table.
@@ -640,12 +769,18 @@ static int netlbl_unlhsh_remove_addr4(struct netlbl_unlhsh_iface *iface,
  * responsible for calling the rcu_read_[un]lock() functions.
  *
  */
-static int netlbl_unlhsh_remove_addr6(struct netlbl_unlhsh_iface *iface,
+static int netlbl_unlhsh_remove_addr6(struct net *net,
+                                      struct netlbl_unlhsh_iface *iface,
                                       const struct in6_addr *addr,
-                                      const struct in6_addr *mask)
+                                      const struct in6_addr *mask,
+                                      struct netlbl_audit *audit_info)
 {
         int ret_val = -ENOENT;
         struct netlbl_unlhsh_addr6 *entry;
+        struct audit_buffer *audit_buf = NULL;
+        struct net_device *dev;
+        char *secctx = NULL;
+        u32 secctx_len;
 
         spin_lock(&netlbl_unlhsh_lock);
         entry = netlbl_unlhsh_search_addr6(addr, iface);
@@ -658,6 +793,25 @@ static int netlbl_unlhsh_remove_addr6(struct netlbl_unlhsh_iface *iface,
         }
         spin_unlock(&netlbl_unlhsh_lock);
 
+        audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL,
+                                              audit_info);
+        if (audit_buf != NULL) {
+                dev = dev_get_by_index(net, iface->ifindex);
+                netlbl_unlabel_audit_addr6(audit_buf,
+                                           (dev != NULL ? dev->name : NULL),
+                                           addr, mask);
+                if (dev != NULL)
+                        dev_put(dev);
+                if (security_secid_to_secctx(entry->secid,
+                                             &secctx,
+                                             &secctx_len) == 0) {
+                        audit_log_format(audit_buf, " sec_obj=%s", secctx);
+                        security_release_secctx(secctx, secctx_len);
+                }
+                audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0);
+                audit_log_end(audit_buf);
+        }
+
         if (ret_val == 0)
                 call_rcu(&entry->rcu, netlbl_unlhsh_free_addr6);
         return ret_val;
@@ -708,6 +862,7 @@ unlhsh_condremove_failure:
  * @addr: IP address in network byte order
  * @mask: address mask in network byte order
  * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6)
+ * @audit_info: NetLabel audit information
  *
  * Description:
  * Removes and existing entry from the unlabeled connection hash table.
@@ -718,7 +873,8 @@ static int netlbl_unlhsh_remove(struct net *net,
                                 const char *dev_name,
                                 const void *addr,
                                 const void *mask,
-                                u32 addr_len)
+                                u32 addr_len,
+                                struct netlbl_audit *audit_info)
 {
         int ret_val;
         struct net_device *dev;
@@ -745,11 +901,15 @@ static int netlbl_unlhsh_remove(struct net *net,
         }
         switch (addr_len) {
         case sizeof(struct in_addr):
-                ret_val = netlbl_unlhsh_remove_addr4(iface, addr, mask);
+                ret_val = netlbl_unlhsh_remove_addr4(net,
+                                                     iface, addr, mask,
+                                                     audit_info);
                 break;
 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
         case sizeof(struct in6_addr):
-                ret_val = netlbl_unlhsh_remove_addr6(iface, addr, mask);
+                ret_val = netlbl_unlhsh_remove_addr6(net,
+                                                     iface, addr, mask,
+                                                     audit_info);
                 break;
 #endif /* IPv6 */
         default:
@@ -972,6 +1132,7 @@ static int netlbl_unlabel_staticadd(struct sk_buff *skb,
         void *mask;
         u32 addr_len;
         u32 secid;
+        struct netlbl_audit audit_info;
 
         /* Don't allow users to add both IPv4 and IPv6 addresses for a
          * single entry.  However, allow users to create two entries, one each
@@ -985,6 +1146,8 @@ static int netlbl_unlabel_staticadd(struct sk_buff *skb,
                !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
                 return -EINVAL;
 
+        netlbl_netlink_auditinfo(skb, &audit_info);
+
         ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
         if (ret_val != 0)
                 return ret_val;
@@ -997,7 +1160,8 @@ static int netlbl_unlabel_staticadd(struct sk_buff *skb,
                 return ret_val;
 
         return netlbl_unlhsh_add(&init_net,
-                                 dev_name, addr, mask, addr_len, secid);
+                                 dev_name, addr, mask, addr_len, secid,
+                                 &audit_info);
 }
 
 /**
@@ -1019,6 +1183,7 @@ static int netlbl_unlabel_staticadddef(struct sk_buff *skb,
         void *mask;
         u32 addr_len;
         u32 secid;
+        struct netlbl_audit audit_info;
 
         /* Don't allow users to add both IPv4 and IPv6 addresses for a
          * single entry.  However, allow users to create two entries, one each
@@ -1031,6 +1196,8 @@ static int netlbl_unlabel_staticadddef(struct sk_buff *skb,
                !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
                 return -EINVAL;
 
+        netlbl_netlink_auditinfo(skb, &audit_info);
+
         ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
         if (ret_val != 0)
                 return ret_val;
@@ -1041,7 +1208,9 @@ static int netlbl_unlabel_staticadddef(struct sk_buff *skb,
         if (ret_val != 0)
                 return ret_val;
 
-        return netlbl_unlhsh_add(&init_net, NULL, addr, mask, addr_len, secid);
+        return netlbl_unlhsh_add(&init_net,
+                                 NULL, addr, mask, addr_len, secid,
+                                 &audit_info);
 }
 
 /**
@@ -1063,6 +1232,7 @@ static int netlbl_unlabel_staticremove(struct sk_buff *skb,
         void *addr;
         void *mask;
         u32 addr_len;
+        struct netlbl_audit audit_info;
 
         /* See the note in netlbl_unlabel_staticadd() about not allowing both
          * IPv4 and IPv6 in the same entry. */
@@ -1073,12 +1243,16 @@ static int netlbl_unlabel_staticremove(struct sk_buff *skb,
                !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
                 return -EINVAL;
 
+        netlbl_netlink_auditinfo(skb, &audit_info);
+
         ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
         if (ret_val != 0)
                 return ret_val;
         dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]);
 
-        return netlbl_unlhsh_remove(&init_net, dev_name, addr, mask, addr_len);
+        return netlbl_unlhsh_remove(&init_net,
+                                    dev_name, addr, mask, addr_len,
+                                    &audit_info);
 }
 
 /**
@@ -1099,6 +1273,7 @@ static int netlbl_unlabel_staticremovedef(struct sk_buff *skb,
         void *addr;
         void *mask;
         u32 addr_len;
+        struct netlbl_audit audit_info;
 
         /* See the note in netlbl_unlabel_staticadd() about not allowing both
          * IPv4 and IPv6 in the same entry. */
@@ -1108,11 +1283,15 @@ static int netlbl_unlabel_staticremovedef(struct sk_buff *skb,
                !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
                 return -EINVAL;
 
+        netlbl_netlink_auditinfo(skb, &audit_info);
+
         ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
         if (ret_val != 0)
                 return ret_val;
 
-        return netlbl_unlhsh_remove(&init_net, NULL, addr, mask, addr_len);
+        return netlbl_unlhsh_remove(&init_net,
+                                    NULL, addr, mask, addr_len,
+                                    &audit_info);
 }