Merge branch 'master' of /home/davem/src/GIT/linux-2.6/

1 files changed, 359 insertions, 0 deletions

diff --git a/security/tomoyo/common.h b/security/tomoyo/common.h
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+++ b/security/tomoyo/common.h
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+/*
+ * security/tomoyo/common.h
+ *
+ * Common functions for TOMOYO.
+ *
+ * Copyright (C) 2005-2009  NTT DATA CORPORATION
+ *
+ * Version: 2.2.0-pre   2009/02/01
+ *
+ */
+
+#ifndef _SECURITY_TOMOYO_COMMON_H
+#define _SECURITY_TOMOYO_COMMON_H
+
+#include <linux/ctype.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/file.h>
+#include <linux/kmod.h>
+#include <linux/fs.h>
+#include <linux/sched.h>
+#include <linux/namei.h>
+#include <linux/mount.h>
+#include <linux/list.h>
+
+struct dentry;
+struct vfsmount;
+
+/* Temporary buffer for holding pathnames. */
+struct tomoyo_page_buffer {
+	char buffer[4096];
+};
+
+/* Structure for holding a token. */
+struct tomoyo_path_info {
+	const char *name;
+	u32 hash;          /* = full_name_hash(name, strlen(name)) */
+	u16 total_len;     /* = strlen(name)                       */
+	u16 const_len;     /* = tomoyo_const_part_length(name)     */
+	bool is_dir;       /* = tomoyo_strendswith(name, "/")      */
+	bool is_patterned; /* = tomoyo_path_contains_pattern(name) */
+	u16 depth;         /* = tomoyo_path_depth(name)            */
+};
+
+/*
+ * This is the max length of a token.
+ *
+ * A token consists of only ASCII printable characters.
+ * Non printable characters in a token is represented in \ooo style
+ * octal string. Thus, \ itself is represented as \\.
+ */
+#define TOMOYO_MAX_PATHNAME_LEN 4000
+
+/* Structure for holding requested pathname. */
+struct tomoyo_path_info_with_data {
+	/* Keep "head" first, for this pointer is passed to tomoyo_free(). */
+	struct tomoyo_path_info head;
+	char bariier1[16]; /* Safeguard for overrun. */
+	char body[TOMOYO_MAX_PATHNAME_LEN];
+	char barrier2[16]; /* Safeguard for overrun. */
+};
+
+/*
+ * Common header for holding ACL entries.
+ *
+ * Packing "struct tomoyo_acl_info" allows
+ * "struct tomoyo_single_path_acl_record" to embed "u16" and
+ * "struct tomoyo_double_path_acl_record" to embed "u8"
+ * without enlarging their structure size.
+ */
+struct tomoyo_acl_info {
+	struct list_head list;
+	/*
+	 * Type of this ACL entry.
+	 *
+	 * MSB is is_deleted flag.
+	 */
+	u8 type;
+} __packed;
+
+/* This ACL entry is deleted.           */
+#define TOMOYO_ACL_DELETED        0x80
+
+/* Structure for domain information. */
+struct tomoyo_domain_info {
+	struct list_head list;
+	struct list_head acl_info_list;
+	/* Name of this domain. Never NULL.          */
+	const struct tomoyo_path_info *domainname;
+	u8 profile;        /* Profile number to use. */
+	u8 is_deleted;     /* Delete flag.
+			      0 = active.
+			      1 = deleted but undeletable.
+			      255 = deleted and no longer undeletable. */
+	bool quota_warned; /* Quota warnning flag.   */
+	/* DOMAIN_FLAGS_*. Use tomoyo_set_domain_flag() to modify. */
+	u8 flags;
+};
+
+/* Profile number is an integer between 0 and 255. */
+#define TOMOYO_MAX_PROFILES 256
+
+/* Ignore "allow_read" directive in exception policy. */
+#define TOMOYO_DOMAIN_FLAGS_IGNORE_GLOBAL_ALLOW_READ 1
+/*
+ * This domain was unable to create a new domain at tomoyo_find_next_domain()
+ * because the name of the domain to be created was too long or
+ * it could not allocate memory.
+ * More than one process continued execve() without domain transition.
+ */
+#define TOMOYO_DOMAIN_FLAGS_TRANSITION_FAILED        2
+
+/*
+ * Structure for "allow_read/write", "allow_execute", "allow_read",
+ * "allow_write", "allow_create", "allow_unlink", "allow_mkdir", "allow_rmdir",
+ * "allow_mkfifo", "allow_mksock", "allow_mkblock", "allow_mkchar",
+ * "allow_truncate", "allow_symlink" and "allow_rewrite" directive.
+ */
+struct tomoyo_single_path_acl_record {
+	struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_SINGLE_PATH_ACL */
+	u16 perm;
+	/* Pointer to single pathname. */
+	const struct tomoyo_path_info *filename;
+};
+
+/* Structure for "allow_rename" and "allow_link" directive. */
+struct tomoyo_double_path_acl_record {
+	struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_DOUBLE_PATH_ACL */
+	u8 perm;
+	/* Pointer to single pathname. */
+	const struct tomoyo_path_info *filename1;
+	/* Pointer to single pathname. */
+	const struct tomoyo_path_info *filename2;
+};
+
+/* Keywords for ACLs. */
+#define TOMOYO_KEYWORD_ALIAS                     "alias "
+#define TOMOYO_KEYWORD_ALLOW_READ                "allow_read "
+#define TOMOYO_KEYWORD_DELETE                    "delete "
+#define TOMOYO_KEYWORD_DENY_REWRITE              "deny_rewrite "
+#define TOMOYO_KEYWORD_FILE_PATTERN              "file_pattern "
+#define TOMOYO_KEYWORD_INITIALIZE_DOMAIN         "initialize_domain "
+#define TOMOYO_KEYWORD_KEEP_DOMAIN               "keep_domain "
+#define TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN      "no_initialize_domain "
+#define TOMOYO_KEYWORD_NO_KEEP_DOMAIN            "no_keep_domain "
+#define TOMOYO_KEYWORD_SELECT                    "select "
+#define TOMOYO_KEYWORD_UNDELETE                  "undelete "
+#define TOMOYO_KEYWORD_USE_PROFILE               "use_profile "
+#define TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ  "ignore_global_allow_read"
+/* A domain definition starts with <kernel>. */
+#define TOMOYO_ROOT_NAME                         "<kernel>"
+#define TOMOYO_ROOT_NAME_LEN                     (sizeof(TOMOYO_ROOT_NAME) - 1)
+
+/* Index numbers for Access Controls. */
+#define TOMOYO_MAC_FOR_FILE                  0  /* domain_policy.conf */
+#define TOMOYO_MAX_ACCEPT_ENTRY              1
+#define TOMOYO_VERBOSE                       2
+#define TOMOYO_MAX_CONTROL_INDEX             3
+
+/* Structure for reading/writing policy via securityfs interfaces. */
+struct tomoyo_io_buffer {
+	int (*read) (struct tomoyo_io_buffer *);
+	int (*write) (struct tomoyo_io_buffer *);
+	/* Exclusive lock for this structure.   */
+	struct mutex io_sem;
+	/* The position currently reading from. */
+	struct list_head *read_var1;
+	/* Extra variables for reading.         */
+	struct list_head *read_var2;
+	/* The position currently writing to.   */
+	struct tomoyo_domain_info *write_var1;
+	/* The step for reading.                */
+	int read_step;
+	/* Buffer for reading.                  */
+	char *read_buf;
+	/* EOF flag for reading.                */
+	bool read_eof;
+	/* Read domain ACL of specified PID?    */
+	bool read_single_domain;
+	/* Extra variable for reading.          */
+	u8 read_bit;
+	/* Bytes available for reading.         */
+	int read_avail;
+	/* Size of read buffer.                 */
+	int readbuf_size;
+	/* Buffer for writing.                  */
+	char *write_buf;
+	/* Bytes available for writing.         */
+	int write_avail;
+	/* Size of write buffer.                */
+	int writebuf_size;
+};
+
+/* Check whether the domain has too many ACL entries to hold. */
+bool tomoyo_domain_quota_is_ok(struct tomoyo_domain_info * const domain);
+/* Transactional sprintf() for policy dump. */
+bool tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
+	__attribute__ ((format(printf, 2, 3)));
+/* Check whether the domainname is correct. */
+bool tomoyo_is_correct_domain(const unsigned char *domainname,
+			      const char *function);
+/* Check whether the token is correct. */
+bool tomoyo_is_correct_path(const char *filename, const s8 start_type,
+			    const s8 pattern_type, const s8 end_type,
+			    const char *function);
+/* Check whether the token can be a domainname. */
+bool tomoyo_is_domain_def(const unsigned char *buffer);
+/* Check whether the given filename matches the given pattern. */
+bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename,
+				 const struct tomoyo_path_info *pattern);
+/* Read "alias" entry in exception policy. */
+bool tomoyo_read_alias_policy(struct tomoyo_io_buffer *head);
+/*
+ * Read "initialize_domain" and "no_initialize_domain" entry
+ * in exception policy.
+ */
+bool tomoyo_read_domain_initializer_policy(struct tomoyo_io_buffer *head);
+/* Read "keep_domain" and "no_keep_domain" entry in exception policy. */
+bool tomoyo_read_domain_keeper_policy(struct tomoyo_io_buffer *head);
+/* Read "file_pattern" entry in exception policy. */
+bool tomoyo_read_file_pattern(struct tomoyo_io_buffer *head);
+/* Read "allow_read" entry in exception policy. */
+bool tomoyo_read_globally_readable_policy(struct tomoyo_io_buffer *head);
+/* Read "deny_rewrite" entry in exception policy. */
+bool tomoyo_read_no_rewrite_policy(struct tomoyo_io_buffer *head);
+/* Write domain policy violation warning message to console? */
+bool tomoyo_verbose_mode(const struct tomoyo_domain_info *domain);
+/* Convert double path operation to operation name. */
+const char *tomoyo_dp2keyword(const u8 operation);
+/* Get the last component of the given domainname. */
+const char *tomoyo_get_last_name(const struct tomoyo_domain_info *domain);
+/* Get warning message. */
+const char *tomoyo_get_msg(const bool is_enforce);
+/* Convert single path operation to operation name. */
+const char *tomoyo_sp2keyword(const u8 operation);
+/* Delete a domain. */
+int tomoyo_delete_domain(char *data);
+/* Create "alias" entry in exception policy. */
+int tomoyo_write_alias_policy(char *data, const bool is_delete);
+/*
+ * Create "initialize_domain" and "no_initialize_domain" entry
+ * in exception policy.
+ */
+int tomoyo_write_domain_initializer_policy(char *data, const bool is_not,
+					   const bool is_delete);
+/* Create "keep_domain" and "no_keep_domain" entry in exception policy. */
+int tomoyo_write_domain_keeper_policy(char *data, const bool is_not,
+				      const bool is_delete);
+/*
+ * Create "allow_read/write", "allow_execute", "allow_read", "allow_write",
+ * "allow_create", "allow_unlink", "allow_mkdir", "allow_rmdir",
+ * "allow_mkfifo", "allow_mksock", "allow_mkblock", "allow_mkchar",
+ * "allow_truncate", "allow_symlink", "allow_rewrite", "allow_rename" and
+ * "allow_link" entry in domain policy.
+ */
+int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain,
+			     const bool is_delete);
+/* Create "allow_read" entry in exception policy. */
+int tomoyo_write_globally_readable_policy(char *data, const bool is_delete);
+/* Create "deny_rewrite" entry in exception policy. */
+int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete);
+/* Create "file_pattern" entry in exception policy. */
+int tomoyo_write_pattern_policy(char *data, const bool is_delete);
+/* Find a domain by the given name. */
+struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname);
+/* Find or create a domain by the given name. */
+struct tomoyo_domain_info *tomoyo_find_or_assign_new_domain(const char *
+							    domainname,
+							    const u8 profile);
+/* Undelete a domain. */
+struct tomoyo_domain_info *tomoyo_undelete_domain(const char *domainname);
+/* Check mode for specified functionality. */
+unsigned int tomoyo_check_flags(const struct tomoyo_domain_info *domain,
+				const u8 index);
+/* Allocate memory for structures. */
+void *tomoyo_alloc_acl_element(const u8 acl_type);
+/* Fill in "struct tomoyo_path_info" members. */
+void tomoyo_fill_path_info(struct tomoyo_path_info *ptr);
+/* Run policy loader when /sbin/init starts. */
+void tomoyo_load_policy(const char *filename);
+/* Change "struct tomoyo_domain_info"->flags. */
+void tomoyo_set_domain_flag(struct tomoyo_domain_info *domain,
+			    const bool is_delete, const u8 flags);
+
+/* strcmp() for "struct tomoyo_path_info" structure. */
+static inline bool tomoyo_pathcmp(const struct tomoyo_path_info *a,
+				  const struct tomoyo_path_info *b)
+{
+	return a->hash != b->hash || strcmp(a->name, b->name);
+}
+
+/* Get type of an ACL entry. */
+static inline u8 tomoyo_acl_type1(struct tomoyo_acl_info *ptr)
+{
+	return ptr->type & ~TOMOYO_ACL_DELETED;
+}
+
+/* Get type of an ACL entry. */
+static inline u8 tomoyo_acl_type2(struct tomoyo_acl_info *ptr)
+{
+	return ptr->type;
+}
+
+/**
+ * tomoyo_is_valid - Check whether the character is a valid char.
+ *
+ * @c: The character to check.
+ *
+ * Returns true if @c is a valid character, false otherwise.
+ */
+static inline bool tomoyo_is_valid(const unsigned char c)
+{
+	return c > ' ' && c < 127;
+}
+
+/**
+ * tomoyo_is_invalid - Check whether the character is an invalid char.
+ *
+ * @c: The character to check.
+ *
+ * Returns true if @c is an invalid character, false otherwise.
+ */
+static inline bool tomoyo_is_invalid(const unsigned char c)
+{
+	return c && (c <= ' ' || c >= 127);
+}
+
+/* The list for "struct tomoyo_domain_info". */
+extern struct list_head tomoyo_domain_list;
+extern struct rw_semaphore tomoyo_domain_list_lock;
+
+/* Lock for domain->acl_info_list. */
+extern struct rw_semaphore tomoyo_domain_acl_info_list_lock;
+
+/* Has /sbin/init started? */
+extern bool tomoyo_policy_loaded;
+
+/* The kernel's domain. */
+extern struct tomoyo_domain_info tomoyo_kernel_domain;
+
+/**
+ * list_for_each_cookie - iterate over a list with cookie.
+ * @pos:        the &struct list_head to use as a loop cursor.
+ * @cookie:     the &struct list_head to use as a cookie.
+ * @head:       the head for your list.
+ *
+ * Same with list_for_each() except that this primitive uses @cookie
+ * so that we can continue iteration.
+ * @cookie must be NULL when iteration starts, and @cookie will become
+ * NULL when iteration finishes.
+ */
+#define list_for_each_cookie(pos, cookie, head)                       \
+	for (({ if (!cookie)                                          \
+				     cookie = head; }),               \
+	     pos = (cookie)->next;                                    \
+	     prefetch(pos->next), pos != (head) || ((cookie) = NULL); \
+	     (cookie) = pos, pos = pos->next)
+
+#endif /* !defined(_SECURITY_TOMOYO_COMMON_H) */