TOMOYO: Update profile structure.

This patch allows users to change access control mode for per-operation basis.
This feature comes from non LSM version of TOMOYO which is designed for
permitting users to use SELinux and TOMOYO at the same time.

SELinux does not care filename in a directory whereas TOMOYO does. Change of
filename can change how the file is used. For example, renaming index.txt to
.htaccess will change how the file is used. Thus, letting SELinux to enforce
read()/write()/mmap() etc. restriction and letting TOMOYO to enforce rename()
restriction is an example usage of this feature.

What is unfortunate for me is that currently LSM does not allow users to use
SELinux and LSM version of TOMOYO at the same time...

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <jmorris@namei.org>

1 files changed, 70 insertions, 22 deletions

diff --git a/security/tomoyo/util.c b/security/tomoyo/util.c
index 592b76a2bce8..307793ed6075 100644
--- a/security/tomoyo/util.c
+++ b/security/tomoyo/util.c
@@ -792,25 +792,67 @@ const char *tomoyo_get_exe(void)
 }
 
 /**
+ * tomoyo_get_mode - Get MAC mode.
+ *
+ * @profile: Profile number.
+ * @index:   Index number of functionality.
+ *
+ * Returns mode.
+ */
+int tomoyo_get_mode(const u8 profile, const u8 index)
+{
+	u8 mode;
+	const u8 category = TOMOYO_MAC_CATEGORY_FILE;
+	if (!tomoyo_policy_loaded)
+		return TOMOYO_CONFIG_DISABLED;
+	mode = tomoyo_profile(profile)->config[index];
+	if (mode == TOMOYO_CONFIG_USE_DEFAULT)
+		mode = tomoyo_profile(profile)->config[category];
+	if (mode == TOMOYO_CONFIG_USE_DEFAULT)
+		mode = tomoyo_profile(profile)->default_config;
+	return mode & 3;
+}
+
+/**
  * tomoyo_init_request_info - Initialize "struct tomoyo_request_info" members.
  *
  * @r:      Pointer to "struct tomoyo_request_info" to initialize.
  * @domain: Pointer to "struct tomoyo_domain_info". NULL for tomoyo_domain().
+ * @index:  Index number of functionality.
  *
  * Returns mode.
  */
 int tomoyo_init_request_info(struct tomoyo_request_info *r,
-			     struct tomoyo_domain_info *domain)
+			     struct tomoyo_domain_info *domain, const u8 index)
 {
+	u8 profile;
 	memset(r, 0, sizeof(*r));
 	if (!domain)
 		domain = tomoyo_domain();
 	r->domain = domain;
-	r->mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE);
+	profile = domain->profile;
+	r->profile = profile;
+	r->type = index;
+	r->mode = tomoyo_get_mode(profile, index);
 	return r->mode;
 }
 
 /**
+ * tomoyo_last_word - Get last component of a line.
+ *
+ * @line: A line.
+ *
+ * Returns the last word of a line.
+ */
+static const char *tomoyo_last_word(const char *name)
+{
+	const char *cp = strrchr(name, ' ');
+	if (cp)
+		return cp + 1;
+	return name;
+}
+
+/**
  * tomoyo_warn_log - Print warning or error message on console.
  *
  * @r:   Pointer to "struct tomoyo_request_info".
@@ -818,29 +860,34 @@ int tomoyo_init_request_info(struct tomoyo_request_info *r,
  */
 void tomoyo_warn_log(struct tomoyo_request_info *r, const char *fmt, ...)
 {
-	int len = PAGE_SIZE;
 	va_list args;
 	char *buffer;
-	if (!tomoyo_verbose_mode(r->domain))
-		return;
-	while (1) {
-		int len2;
-		buffer = kmalloc(len, GFP_NOFS);
-		if (!buffer)
+	const struct tomoyo_domain_info * const domain = r->domain;
+	const struct tomoyo_profile *profile = tomoyo_profile(domain->profile);
+	switch (r->mode) {
+	case TOMOYO_CONFIG_ENFORCING:
+		if (!profile->enforcing->enforcing_verbose)
 			return;
-		va_start(args, fmt);
-		len2 = vsnprintf(buffer, len - 1, fmt, args);
-		va_end(args);
-		if (len2 <= len - 1) {
-			buffer[len2] = '\0';
-			break;
-		}
-		len = len2 + 1;
-		kfree(buffer);
+		break;
+	case TOMOYO_CONFIG_PERMISSIVE:
+		if (!profile->permissive->permissive_verbose)
+			return;
+		break;
+	case TOMOYO_CONFIG_LEARNING:
+		if (!profile->learning->learning_verbose)
+			return;
+		break;
 	}
-	printk(KERN_WARNING "TOMOYO-%s: Access %s denied for %s\n",
-	       r->mode == TOMOYO_CONFIG_ENFORCING ? "ERROR" : "WARNING",
-	       buffer, tomoyo_get_last_name(r->domain));
+	buffer = kmalloc(4096, GFP_NOFS);
+	if (!buffer)
+		return;
+	va_start(args, fmt);
+	vsnprintf(buffer, 4095, fmt, args);
+	va_end(args);
+	buffer[4095] = '\0';
+	printk(KERN_WARNING "%s: Access %s denied for %s\n",
+	       r->mode == TOMOYO_CONFIG_ENFORCING ? "ERROR" : "WARNING", buffer,
+	       tomoyo_last_word(domain->domainname->name));
 	kfree(buffer);
 }
 
@@ -903,7 +950,8 @@ bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r)
 				count++;
 		}
 	}
-	if (count < tomoyo_check_flags(domain, TOMOYO_MAX_ACCEPT_ENTRY))
+	if (count < tomoyo_profile(domain->profile)->learning->
+	    learning_max_entry)
 		return true;
 	if (!domain->quota_warned) {
 		domain->quota_warned = true;