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@@ -0,0 +1,951 @@
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+/*
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+ * security/tomoyo/util.c
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+ *
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+ * Utility functions for TOMOYO.
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+ *
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+ * Copyright (C) 2005-2010 NTT DATA CORPORATION
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+ */
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+
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+#include <linux/slab.h>
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+#include "common.h"
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+
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+/* Lock for protecting policy. */
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+DEFINE_MUTEX(tomoyo_policy_lock);
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+
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+/* Has /sbin/init started? */
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+bool tomoyo_policy_loaded;
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+
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+/**
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+ * tomoyo_parse_ulong - Parse an "unsigned long" value.
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+ *
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+ * @result: Pointer to "unsigned long".
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+ * @str: Pointer to string to parse.
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+ *
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+ * Returns value type on success, 0 otherwise.
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+ *
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+ * The @src is updated to point the first character after the value
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+ * on success.
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+ */
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+u8 tomoyo_parse_ulong(unsigned long *result, char **str)
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+{
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+ const char *cp = *str;
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+ char *ep;
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+ int base = 10;
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+ if (*cp == '0') {
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+ char c = *(cp + 1);
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+ if (c == 'x' || c == 'X') {
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+ base = 16;
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+ cp += 2;
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+ } else if (c >= '0' && c <= '7') {
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+ base = 8;
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+ cp++;
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+ }
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+ }
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+ *result = simple_strtoul(cp, &ep, base);
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+ if (cp == ep)
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+ return 0;
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+ *str = ep;
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+ switch (base) {
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+ case 16:
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+ return TOMOYO_VALUE_TYPE_HEXADECIMAL;
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+ case 8:
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+ return TOMOYO_VALUE_TYPE_OCTAL;
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+ default:
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+ return TOMOYO_VALUE_TYPE_DECIMAL;
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+ }
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+}
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+
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+/**
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+ * tomoyo_print_ulong - Print an "unsigned long" value.
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+ *
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+ * @buffer: Pointer to buffer.
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+ * @buffer_len: Size of @buffer.
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+ * @value: An "unsigned long" value.
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+ * @type: Type of @value.
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+ *
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+ * Returns nothing.
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+ */
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+void tomoyo_print_ulong(char *buffer, const int buffer_len,
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+ const unsigned long value, const u8 type)
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+{
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+ if (type == TOMOYO_VALUE_TYPE_DECIMAL)
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+ snprintf(buffer, buffer_len, "%lu", value);
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+ else if (type == TOMOYO_VALUE_TYPE_OCTAL)
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+ snprintf(buffer, buffer_len, "0%lo", value);
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+ else if (type == TOMOYO_VALUE_TYPE_HEXADECIMAL)
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+ snprintf(buffer, buffer_len, "0x%lX", value);
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+ else
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+ snprintf(buffer, buffer_len, "type(%u)", type);
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+}
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+
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+/**
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+ * tomoyo_parse_name_union - Parse a tomoyo_name_union.
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+ *
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+ * @filename: Name or name group.
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+ * @ptr: Pointer to "struct tomoyo_name_union".
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+ *
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+ * Returns true on success, false otherwise.
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+ */
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+bool tomoyo_parse_name_union(const char *filename,
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+ struct tomoyo_name_union *ptr)
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+{
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+ if (!tomoyo_is_correct_path(filename, 0, 0, 0))
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+ return false;
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+ if (filename[0] == '@') {
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+ ptr->group = tomoyo_get_path_group(filename + 1);
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+ ptr->is_group = true;
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+ return ptr->group != NULL;
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+ }
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+ ptr->filename = tomoyo_get_name(filename);
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+ ptr->is_group = false;
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+ return ptr->filename != NULL;
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+}
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+
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+/**
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+ * tomoyo_parse_number_union - Parse a tomoyo_number_union.
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+ *
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+ * @data: Number or number range or number group.
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+ * @ptr: Pointer to "struct tomoyo_number_union".
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+ *
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+ * Returns true on success, false otherwise.
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+ */
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+bool tomoyo_parse_number_union(char *data, struct tomoyo_number_union *num)
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+{
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+ u8 type;
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+ unsigned long v;
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+ memset(num, 0, sizeof(*num));
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+ if (data[0] == '@') {
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+ if (!tomoyo_is_correct_path(data, 0, 0, 0))
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+ return false;
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+ num->group = tomoyo_get_number_group(data + 1);
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+ num->is_group = true;
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+ return num->group != NULL;
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+ }
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+ type = tomoyo_parse_ulong(&v, &data);
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+ if (!type)
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+ return false;
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+ num->values[0] = v;
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+ num->min_type = type;
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+ if (!*data) {
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+ num->values[1] = v;
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+ num->max_type = type;
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+ return true;
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+ }
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+ if (*data++ != '-')
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+ return false;
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+ type = tomoyo_parse_ulong(&v, &data);
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+ if (!type || *data)
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+ return false;
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+ num->values[1] = v;
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+ num->max_type = type;
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+ return true;
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+}
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+
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+/**
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+ * tomoyo_is_byte_range - Check whether the string is a \ooo style octal value.
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+ *
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+ * @str: Pointer to the string.
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+ *
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+ * Returns true if @str is a \ooo style octal value, false otherwise.
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+ *
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+ * TOMOYO uses \ooo style representation for 0x01 - 0x20 and 0x7F - 0xFF.
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+ * This function verifies that \ooo is in valid range.
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+ */
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+static inline bool tomoyo_is_byte_range(const char *str)
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+{
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+ return *str >= '0' && *str++ <= '3' &&
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+ *str >= '0' && *str++ <= '7' &&
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+ *str >= '0' && *str <= '7';
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+}
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+
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+/**
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+ * tomoyo_is_alphabet_char - Check whether the character is an alphabet.
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+ *
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+ * @c: The character to check.
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+ *
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+ * Returns true if @c is an alphabet character, false otherwise.
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+ */
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+static inline bool tomoyo_is_alphabet_char(const char c)
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+{
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+ return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z');
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+}
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+
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+/**
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+ * tomoyo_make_byte - Make byte value from three octal characters.
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+ *
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+ * @c1: The first character.
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+ * @c2: The second character.
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+ * @c3: The third character.
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+ *
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+ * Returns byte value.
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+ */
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+static inline u8 tomoyo_make_byte(const u8 c1, const u8 c2, const u8 c3)
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+{
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+ return ((c1 - '0') << 6) + ((c2 - '0') << 3) + (c3 - '0');
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+}
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+
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+/**
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+ * tomoyo_str_starts - Check whether the given string starts with the given keyword.
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+ *
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+ * @src: Pointer to pointer to the string.
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+ * @find: Pointer to the keyword.
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+ *
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+ * Returns true if @src starts with @find, false otherwise.
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+ *
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+ * The @src is updated to point the first character after the @find
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+ * if @src starts with @find.
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+ */
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+bool tomoyo_str_starts(char **src, const char *find)
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+{
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+ const int len = strlen(find);
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+ char *tmp = *src;
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+
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+ if (strncmp(tmp, find, len))
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+ return false;
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+ tmp += len;
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+ *src = tmp;
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+ return true;
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+}
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+
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+/**
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+ * tomoyo_normalize_line - Format string.
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+ *
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+ * @buffer: The line to normalize.
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+ *
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+ * Leading and trailing whitespaces are removed.
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+ * Multiple whitespaces are packed into single space.
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+ *
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+ * Returns nothing.
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+ */
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+void tomoyo_normalize_line(unsigned char *buffer)
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+{
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+ unsigned char *sp = buffer;
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+ unsigned char *dp = buffer;
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+ bool first = true;
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+
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+ while (tomoyo_is_invalid(*sp))
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+ sp++;
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+ while (*sp) {
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+ if (!first)
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+ *dp++ = ' ';
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+ first = false;
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+ while (tomoyo_is_valid(*sp))
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+ *dp++ = *sp++;
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+ while (tomoyo_is_invalid(*sp))
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+ sp++;
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+ }
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+ *dp = '\0';
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+}
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+
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+/**
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+ * tomoyo_tokenize - Tokenize string.
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+ *
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+ * @buffer: The line to tokenize.
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+ * @w: Pointer to "char *".
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+ * @size: Sizeof @w .
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+ *
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+ * Returns true on success, false otherwise.
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+ */
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+bool tomoyo_tokenize(char *buffer, char *w[], size_t size)
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+{
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+ int count = size / sizeof(char *);
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+ int i;
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+ for (i = 0; i < count; i++)
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+ w[i] = "";
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+ for (i = 0; i < count; i++) {
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+ char *cp = strchr(buffer, ' ');
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+ if (cp)
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+ *cp = '\0';
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+ w[i] = buffer;
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+ if (!cp)
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+ break;
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+ buffer = cp + 1;
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+ }
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+ return i < count || !*buffer;
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+}
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+
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+/**
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+ * tomoyo_is_correct_path - Validate a pathname.
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+ *
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+ * @filename: The pathname to check.
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+ * @start_type: Should the pathname start with '/'?
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+ * 1 = must / -1 = must not / 0 = don't care
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+ * @pattern_type: Can the pathname contain a wildcard?
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+ * 1 = must / -1 = must not / 0 = don't care
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+ * @end_type: Should the pathname end with '/'?
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+ * 1 = must / -1 = must not / 0 = don't care
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+ *
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+ * Check whether the given filename follows the naming rules.
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+ * Returns true if @filename follows the naming rules, false otherwise.
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+ */
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+bool tomoyo_is_correct_path(const char *filename, const s8 start_type,
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+ const s8 pattern_type, const s8 end_type)
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+{
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+ const char *const start = filename;
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+ bool in_repetition = false;
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+ bool contains_pattern = false;
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+ unsigned char c;
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+ unsigned char d;
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+ unsigned char e;
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+
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+ if (!filename)
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+ goto out;
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+ c = *filename;
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+ if (start_type == 1) { /* Must start with '/' */
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+ if (c != '/')
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+ goto out;
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+ } else if (start_type == -1) { /* Must not start with '/' */
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+ if (c == '/')
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+ goto out;
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+ }
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+ if (c)
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+ c = *(filename + strlen(filename) - 1);
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+ if (end_type == 1) { /* Must end with '/' */
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+ if (c != '/')
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+ goto out;
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+ } else if (end_type == -1) { /* Must not end with '/' */
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+ if (c == '/')
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+ goto out;
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+ }
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+ while (1) {
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+ c = *filename++;
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+ if (!c)
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+ break;
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+ if (c == '\\') {
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+ c = *filename++;
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+ switch (c) {
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+ case '\\': /* "\\" */
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+ continue;
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+ case '$': /* "\$" */
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+ case '+': /* "\+" */
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+ case '?': /* "\?" */
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+ case '*': /* "\*" */
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+ case '@': /* "\@" */
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+ case 'x': /* "\x" */
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+ case 'X': /* "\X" */
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+ case 'a': /* "\a" */
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+ case 'A': /* "\A" */
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+ case '-': /* "\-" */
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+ if (pattern_type == -1)
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+ break; /* Must not contain pattern */
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+ contains_pattern = true;
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+ continue;
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+ case '{': /* "/\{" */
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+ if (filename - 3 < start ||
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+ *(filename - 3) != '/')
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+ break;
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+ if (pattern_type == -1)
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+ break; /* Must not contain pattern */
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+ contains_pattern = true;
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+ in_repetition = true;
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+ continue;
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+ case '}': /* "\}/" */
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+ if (*filename != '/')
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+ break;
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+ if (!in_repetition)
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+ break;
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+ in_repetition = false;
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+ continue;
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+ case '0': /* "\ooo" */
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+ case '1':
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+ case '2':
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+ case '3':
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+ d = *filename++;
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+ if (d < '0' || d > '7')
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+ break;
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+ e = *filename++;
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+ if (e < '0' || e > '7')
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+ break;
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+ c = tomoyo_make_byte(c, d, e);
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+ if (tomoyo_is_invalid(c))
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+ continue; /* pattern is not \000 */
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+ }
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+ goto out;
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+ } else if (in_repetition && c == '/') {
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+ goto out;
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+ } else if (tomoyo_is_invalid(c)) {
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+ goto out;
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+ }
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+ }
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+ if (pattern_type == 1) { /* Must contain pattern */
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+ if (!contains_pattern)
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+ goto out;
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+ }
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+ if (in_repetition)
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+ goto out;
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+ return true;
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+ out:
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+ return false;
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+}
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+
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+/**
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+ * tomoyo_is_correct_domain - Check whether the given domainname follows the naming rules.
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+ *
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+ * @domainname: The domainname to check.
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+ *
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+ * Returns true if @domainname follows the naming rules, false otherwise.
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+ */
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+bool tomoyo_is_correct_domain(const unsigned char *domainname)
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+{
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+ unsigned char c;
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+ unsigned char d;
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+ unsigned char e;
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+
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+ if (!domainname || strncmp(domainname, TOMOYO_ROOT_NAME,
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+ TOMOYO_ROOT_NAME_LEN))
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+ goto out;
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+ domainname += TOMOYO_ROOT_NAME_LEN;
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+ if (!*domainname)
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+ return true;
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+ do {
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+ if (*domainname++ != ' ')
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+ goto out;
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+ if (*domainname++ != '/')
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+ goto out;
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+ while ((c = *domainname) != '\0' && c != ' ') {
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+ domainname++;
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+ if (c == '\\') {
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+ c = *domainname++;
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+ switch ((c)) {
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+ case '\\': /* "\\" */
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+ continue;
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+ case '0': /* "\ooo" */
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+ case '1':
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+ case '2':
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+ case '3':
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+ d = *domainname++;
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+ if (d < '0' || d > '7')
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+ break;
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+ e = *domainname++;
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+ if (e < '0' || e > '7')
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+ break;
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+ c = tomoyo_make_byte(c, d, e);
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+ if (tomoyo_is_invalid(c))
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+ /* pattern is not \000 */
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+ continue;
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+ }
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+ goto out;
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+ } else if (tomoyo_is_invalid(c)) {
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+ goto out;
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+ }
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+ }
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+ } while (*domainname);
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|
+ return true;
|
|
|
+ out:
|
|
|
+ return false;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * tomoyo_is_domain_def - Check whether the given token can be a domainname.
|
|
|
+ *
|
|
|
+ * @buffer: The token to check.
|
|
|
+ *
|
|
|
+ * Returns true if @buffer possibly be a domainname, false otherwise.
|
|
|
+ */
|
|
|
+bool tomoyo_is_domain_def(const unsigned char *buffer)
|
|
|
+{
|
|
|
+ return !strncmp(buffer, TOMOYO_ROOT_NAME, TOMOYO_ROOT_NAME_LEN);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * tomoyo_find_domain - Find a domain by the given name.
|
|
|
+ *
|
|
|
+ * @domainname: The domainname to find.
|
|
|
+ *
|
|
|
+ * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
|
|
|
+ *
|
|
|
+ * Caller holds tomoyo_read_lock().
|
|
|
+ */
|
|
|
+struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname)
|
|
|
+{
|
|
|
+ struct tomoyo_domain_info *domain;
|
|
|
+ struct tomoyo_path_info name;
|
|
|
+
|
|
|
+ name.name = domainname;
|
|
|
+ tomoyo_fill_path_info(&name);
|
|
|
+ list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
|
|
|
+ if (!domain->is_deleted &&
|
|
|
+ !tomoyo_pathcmp(&name, domain->domainname))
|
|
|
+ return domain;
|
|
|
+ }
|
|
|
+ return NULL;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * tomoyo_const_part_length - Evaluate the initial length without a pattern in a token.
|
|
|
+ *
|
|
|
+ * @filename: The string to evaluate.
|
|
|
+ *
|
|
|
+ * Returns the initial length without a pattern in @filename.
|
|
|
+ */
|
|
|
+static int tomoyo_const_part_length(const char *filename)
|
|
|
+{
|
|
|
+ char c;
|
|
|
+ int len = 0;
|
|
|
+
|
|
|
+ if (!filename)
|
|
|
+ return 0;
|
|
|
+ while ((c = *filename++) != '\0') {
|
|
|
+ if (c != '\\') {
|
|
|
+ len++;
|
|
|
+ continue;
|
|
|
+ }
|
|
|
+ c = *filename++;
|
|
|
+ switch (c) {
|
|
|
+ case '\\': /* "\\" */
|
|
|
+ len += 2;
|
|
|
+ continue;
|
|
|
+ case '0': /* "\ooo" */
|
|
|
+ case '1':
|
|
|
+ case '2':
|
|
|
+ case '3':
|
|
|
+ c = *filename++;
|
|
|
+ if (c < '0' || c > '7')
|
|
|
+ break;
|
|
|
+ c = *filename++;
|
|
|
+ if (c < '0' || c > '7')
|
|
|
+ break;
|
|
|
+ len += 4;
|
|
|
+ continue;
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ return len;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * tomoyo_fill_path_info - Fill in "struct tomoyo_path_info" members.
|
|
|
+ *
|
|
|
+ * @ptr: Pointer to "struct tomoyo_path_info" to fill in.
|
|
|
+ *
|
|
|
+ * The caller sets "struct tomoyo_path_info"->name.
|
|
|
+ */
|
|
|
+void tomoyo_fill_path_info(struct tomoyo_path_info *ptr)
|
|
|
+{
|
|
|
+ const char *name = ptr->name;
|
|
|
+ const int len = strlen(name);
|
|
|
+
|
|
|
+ ptr->const_len = tomoyo_const_part_length(name);
|
|
|
+ ptr->is_dir = len && (name[len - 1] == '/');
|
|
|
+ ptr->is_patterned = (ptr->const_len < len);
|
|
|
+ ptr->hash = full_name_hash(name, len);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * tomoyo_file_matches_pattern2 - Pattern matching without '/' character and "\-" pattern.
|
|
|
+ *
|
|
|
+ * @filename: The start of string to check.
|
|
|
+ * @filename_end: The end of string to check.
|
|
|
+ * @pattern: The start of pattern to compare.
|
|
|
+ * @pattern_end: The end of pattern to compare.
|
|
|
+ *
|
|
|
+ * Returns true if @filename matches @pattern, false otherwise.
|
|
|
+ */
|
|
|
+static bool tomoyo_file_matches_pattern2(const char *filename,
|
|
|
+ const char *filename_end,
|
|
|
+ const char *pattern,
|
|
|
+ const char *pattern_end)
|
|
|
+{
|
|
|
+ while (filename < filename_end && pattern < pattern_end) {
|
|
|
+ char c;
|
|
|
+ if (*pattern != '\\') {
|
|
|
+ if (*filename++ != *pattern++)
|
|
|
+ return false;
|
|
|
+ continue;
|
|
|
+ }
|
|
|
+ c = *filename;
|
|
|
+ pattern++;
|
|
|
+ switch (*pattern) {
|
|
|
+ int i;
|
|
|
+ int j;
|
|
|
+ case '?':
|
|
|
+ if (c == '/') {
|
|
|
+ return false;
|
|
|
+ } else if (c == '\\') {
|
|
|
+ if (filename[1] == '\\')
|
|
|
+ filename++;
|
|
|
+ else if (tomoyo_is_byte_range(filename + 1))
|
|
|
+ filename += 3;
|
|
|
+ else
|
|
|
+ return false;
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case '\\':
|
|
|
+ if (c != '\\')
|
|
|
+ return false;
|
|
|
+ if (*++filename != '\\')
|
|
|
+ return false;
|
|
|
+ break;
|
|
|
+ case '+':
|
|
|
+ if (!isdigit(c))
|
|
|
+ return false;
|
|
|
+ break;
|
|
|
+ case 'x':
|
|
|
+ if (!isxdigit(c))
|
|
|
+ return false;
|
|
|
+ break;
|
|
|
+ case 'a':
|
|
|
+ if (!tomoyo_is_alphabet_char(c))
|
|
|
+ return false;
|
|
|
+ break;
|
|
|
+ case '0':
|
|
|
+ case '1':
|
|
|
+ case '2':
|
|
|
+ case '3':
|
|
|
+ if (c == '\\' && tomoyo_is_byte_range(filename + 1)
|
|
|
+ && strncmp(filename + 1, pattern, 3) == 0) {
|
|
|
+ filename += 3;
|
|
|
+ pattern += 2;
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ return false; /* Not matched. */
|
|
|
+ case '*':
|
|
|
+ case '@':
|
|
|
+ for (i = 0; i <= filename_end - filename; i++) {
|
|
|
+ if (tomoyo_file_matches_pattern2(
|
|
|
+ filename + i, filename_end,
|
|
|
+ pattern + 1, pattern_end))
|
|
|
+ return true;
|
|
|
+ c = filename[i];
|
|
|
+ if (c == '.' && *pattern == '@')
|
|
|
+ break;
|
|
|
+ if (c != '\\')
|
|
|
+ continue;
|
|
|
+ if (filename[i + 1] == '\\')
|
|
|
+ i++;
|
|
|
+ else if (tomoyo_is_byte_range(filename + i + 1))
|
|
|
+ i += 3;
|
|
|
+ else
|
|
|
+ break; /* Bad pattern. */
|
|
|
+ }
|
|
|
+ return false; /* Not matched. */
|
|
|
+ default:
|
|
|
+ j = 0;
|
|
|
+ c = *pattern;
|
|
|
+ if (c == '$') {
|
|
|
+ while (isdigit(filename[j]))
|
|
|
+ j++;
|
|
|
+ } else if (c == 'X') {
|
|
|
+ while (isxdigit(filename[j]))
|
|
|
+ j++;
|
|
|
+ } else if (c == 'A') {
|
|
|
+ while (tomoyo_is_alphabet_char(filename[j]))
|
|
|
+ j++;
|
|
|
+ }
|
|
|
+ for (i = 1; i <= j; i++) {
|
|
|
+ if (tomoyo_file_matches_pattern2(
|
|
|
+ filename + i, filename_end,
|
|
|
+ pattern + 1, pattern_end))
|
|
|
+ return true;
|
|
|
+ }
|
|
|
+ return false; /* Not matched or bad pattern. */
|
|
|
+ }
|
|
|
+ filename++;
|
|
|
+ pattern++;
|
|
|
+ }
|
|
|
+ while (*pattern == '\\' &&
|
|
|
+ (*(pattern + 1) == '*' || *(pattern + 1) == '@'))
|
|
|
+ pattern += 2;
|
|
|
+ return filename == filename_end && pattern == pattern_end;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * tomoyo_file_matches_pattern - Pattern matching without '/' character.
|
|
|
+ *
|
|
|
+ * @filename: The start of string to check.
|
|
|
+ * @filename_end: The end of string to check.
|
|
|
+ * @pattern: The start of pattern to compare.
|
|
|
+ * @pattern_end: The end of pattern to compare.
|
|
|
+ *
|
|
|
+ * Returns true if @filename matches @pattern, false otherwise.
|
|
|
+ */
|
|
|
+static bool tomoyo_file_matches_pattern(const char *filename,
|
|
|
+ const char *filename_end,
|
|
|
+ const char *pattern,
|
|
|
+ const char *pattern_end)
|
|
|
+{
|
|
|
+ const char *pattern_start = pattern;
|
|
|
+ bool first = true;
|
|
|
+ bool result;
|
|
|
+
|
|
|
+ while (pattern < pattern_end - 1) {
|
|
|
+ /* Split at "\-" pattern. */
|
|
|
+ if (*pattern++ != '\\' || *pattern++ != '-')
|
|
|
+ continue;
|
|
|
+ result = tomoyo_file_matches_pattern2(filename,
|
|
|
+ filename_end,
|
|
|
+ pattern_start,
|
|
|
+ pattern - 2);
|
|
|
+ if (first)
|
|
|
+ result = !result;
|
|
|
+ if (result)
|
|
|
+ return false;
|
|
|
+ first = false;
|
|
|
+ pattern_start = pattern;
|
|
|
+ }
|
|
|
+ result = tomoyo_file_matches_pattern2(filename, filename_end,
|
|
|
+ pattern_start, pattern_end);
|
|
|
+ return first ? result : !result;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * tomoyo_path_matches_pattern2 - Do pathname pattern matching.
|
|
|
+ *
|
|
|
+ * @f: The start of string to check.
|
|
|
+ * @p: The start of pattern to compare.
|
|
|
+ *
|
|
|
+ * Returns true if @f matches @p, false otherwise.
|
|
|
+ */
|
|
|
+static bool tomoyo_path_matches_pattern2(const char *f, const char *p)
|
|
|
+{
|
|
|
+ const char *f_delimiter;
|
|
|
+ const char *p_delimiter;
|
|
|
+
|
|
|
+ while (*f && *p) {
|
|
|
+ f_delimiter = strchr(f, '/');
|
|
|
+ if (!f_delimiter)
|
|
|
+ f_delimiter = f + strlen(f);
|
|
|
+ p_delimiter = strchr(p, '/');
|
|
|
+ if (!p_delimiter)
|
|
|
+ p_delimiter = p + strlen(p);
|
|
|
+ if (*p == '\\' && *(p + 1) == '{')
|
|
|
+ goto recursive;
|
|
|
+ if (!tomoyo_file_matches_pattern(f, f_delimiter, p,
|
|
|
+ p_delimiter))
|
|
|
+ return false;
|
|
|
+ f = f_delimiter;
|
|
|
+ if (*f)
|
|
|
+ f++;
|
|
|
+ p = p_delimiter;
|
|
|
+ if (*p)
|
|
|
+ p++;
|
|
|
+ }
|
|
|
+ /* Ignore trailing "\*" and "\@" in @pattern. */
|
|
|
+ while (*p == '\\' &&
|
|
|
+ (*(p + 1) == '*' || *(p + 1) == '@'))
|
|
|
+ p += 2;
|
|
|
+ return !*f && !*p;
|
|
|
+ recursive:
|
|
|
+ /*
|
|
|
+ * The "\{" pattern is permitted only after '/' character.
|
|
|
+ * This guarantees that below "*(p - 1)" is safe.
|
|
|
+ * Also, the "\}" pattern is permitted only before '/' character
|
|
|
+ * so that "\{" + "\}" pair will not break the "\-" operator.
|
|
|
+ */
|
|
|
+ if (*(p - 1) != '/' || p_delimiter <= p + 3 || *p_delimiter != '/' ||
|
|
|
+ *(p_delimiter - 1) != '}' || *(p_delimiter - 2) != '\\')
|
|
|
+ return false; /* Bad pattern. */
|
|
|
+ do {
|
|
|
+ /* Compare current component with pattern. */
|
|
|
+ if (!tomoyo_file_matches_pattern(f, f_delimiter, p + 2,
|
|
|
+ p_delimiter - 2))
|
|
|
+ break;
|
|
|
+ /* Proceed to next component. */
|
|
|
+ f = f_delimiter;
|
|
|
+ if (!*f)
|
|
|
+ break;
|
|
|
+ f++;
|
|
|
+ /* Continue comparison. */
|
|
|
+ if (tomoyo_path_matches_pattern2(f, p_delimiter + 1))
|
|
|
+ return true;
|
|
|
+ f_delimiter = strchr(f, '/');
|
|
|
+ } while (f_delimiter);
|
|
|
+ return false; /* Not matched. */
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * tomoyo_path_matches_pattern - Check whether the given filename matches the given pattern.
|
|
|
+ *
|
|
|
+ * @filename: The filename to check.
|
|
|
+ * @pattern: The pattern to compare.
|
|
|
+ *
|
|
|
+ * Returns true if matches, false otherwise.
|
|
|
+ *
|
|
|
+ * The following patterns are available.
|
|
|
+ * \\ \ itself.
|
|
|
+ * \ooo Octal representation of a byte.
|
|
|
+ * \* Zero or more repetitions of characters other than '/'.
|
|
|
+ * \@ Zero or more repetitions of characters other than '/' or '.'.
|
|
|
+ * \? 1 byte character other than '/'.
|
|
|
+ * \$ One or more repetitions of decimal digits.
|
|
|
+ * \+ 1 decimal digit.
|
|
|
+ * \X One or more repetitions of hexadecimal digits.
|
|
|
+ * \x 1 hexadecimal digit.
|
|
|
+ * \A One or more repetitions of alphabet characters.
|
|
|
+ * \a 1 alphabet character.
|
|
|
+ *
|
|
|
+ * \- Subtraction operator.
|
|
|
+ *
|
|
|
+ * /\{dir\}/ '/' + 'One or more repetitions of dir/' (e.g. /dir/ /dir/dir/
|
|
|
+ * /dir/dir/dir/ ).
|
|
|
+ */
|
|
|
+bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename,
|
|
|
+ const struct tomoyo_path_info *pattern)
|
|
|
+{
|
|
|
+ const char *f = filename->name;
|
|
|
+ const char *p = pattern->name;
|
|
|
+ const int len = pattern->const_len;
|
|
|
+
|
|
|
+ /* If @pattern doesn't contain pattern, I can use strcmp(). */
|
|
|
+ if (!pattern->is_patterned)
|
|
|
+ return !tomoyo_pathcmp(filename, pattern);
|
|
|
+ /* Don't compare directory and non-directory. */
|
|
|
+ if (filename->is_dir != pattern->is_dir)
|
|
|
+ return false;
|
|
|
+ /* Compare the initial length without patterns. */
|
|
|
+ if (strncmp(f, p, len))
|
|
|
+ return false;
|
|
|
+ f += len;
|
|
|
+ p += len;
|
|
|
+ return tomoyo_path_matches_pattern2(f, p);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * tomoyo_get_exe - Get tomoyo_realpath() of current process.
|
|
|
+ *
|
|
|
+ * Returns the tomoyo_realpath() of current process on success, NULL otherwise.
|
|
|
+ *
|
|
|
+ * This function uses kzalloc(), so the caller must call kfree()
|
|
|
+ * if this function didn't return NULL.
|
|
|
+ */
|
|
|
+const char *tomoyo_get_exe(void)
|
|
|
+{
|
|
|
+ struct mm_struct *mm = current->mm;
|
|
|
+ struct vm_area_struct *vma;
|
|
|
+ const char *cp = NULL;
|
|
|
+
|
|
|
+ if (!mm)
|
|
|
+ return NULL;
|
|
|
+ down_read(&mm->mmap_sem);
|
|
|
+ for (vma = mm->mmap; vma; vma = vma->vm_next) {
|
|
|
+ if ((vma->vm_flags & VM_EXECUTABLE) && vma->vm_file) {
|
|
|
+ cp = tomoyo_realpath_from_path(&vma->vm_file->f_path);
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ up_read(&mm->mmap_sem);
|
|
|
+ return cp;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * 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().
|
|
|
+ *
|
|
|
+ * Returns mode.
|
|
|
+ */
|
|
|
+int tomoyo_init_request_info(struct tomoyo_request_info *r,
|
|
|
+ struct tomoyo_domain_info *domain)
|
|
|
+{
|
|
|
+ memset(r, 0, sizeof(*r));
|
|
|
+ if (!domain)
|
|
|
+ domain = tomoyo_domain();
|
|
|
+ r->domain = domain;
|
|
|
+ r->mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE);
|
|
|
+ return r->mode;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * tomoyo_warn_log - Print warning or error message on console.
|
|
|
+ *
|
|
|
+ * @r: Pointer to "struct tomoyo_request_info".
|
|
|
+ * @fmt: The printf()'s format string, followed by parameters.
|
|
|
+ */
|
|
|
+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)
|
|
|
+ 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);
|
|
|
+ }
|
|
|
+ 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));
|
|
|
+ kfree(buffer);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * tomoyo_domain_quota_is_ok - Check for domain's quota.
|
|
|
+ *
|
|
|
+ * @r: Pointer to "struct tomoyo_request_info".
|
|
|
+ *
|
|
|
+ * Returns true if the domain is not exceeded quota, false otherwise.
|
|
|
+ *
|
|
|
+ * Caller holds tomoyo_read_lock().
|
|
|
+ */
|
|
|
+bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r)
|
|
|
+{
|
|
|
+ unsigned int count = 0;
|
|
|
+ struct tomoyo_domain_info *domain = r->domain;
|
|
|
+ struct tomoyo_acl_info *ptr;
|
|
|
+
|
|
|
+ if (r->mode != TOMOYO_CONFIG_LEARNING)
|
|
|
+ return false;
|
|
|
+ if (!domain)
|
|
|
+ return true;
|
|
|
+ list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
|
|
|
+ switch (ptr->type) {
|
|
|
+ u16 perm;
|
|
|
+ u8 i;
|
|
|
+ case TOMOYO_TYPE_PATH_ACL:
|
|
|
+ perm = container_of(ptr, struct tomoyo_path_acl, head)
|
|
|
+ ->perm;
|
|
|
+ for (i = 0; i < TOMOYO_MAX_PATH_OPERATION; i++)
|
|
|
+ if (perm & (1 << i))
|
|
|
+ count++;
|
|
|
+ if (perm & (1 << TOMOYO_TYPE_READ_WRITE))
|
|
|
+ count -= 2;
|
|
|
+ break;
|
|
|
+ case TOMOYO_TYPE_PATH2_ACL:
|
|
|
+ perm = container_of(ptr, struct tomoyo_path2_acl, head)
|
|
|
+ ->perm;
|
|
|
+ for (i = 0; i < TOMOYO_MAX_PATH2_OPERATION; i++)
|
|
|
+ if (perm & (1 << i))
|
|
|
+ count++;
|
|
|
+ break;
|
|
|
+ case TOMOYO_TYPE_PATH_NUMBER_ACL:
|
|
|
+ perm = container_of(ptr, struct tomoyo_path_number_acl,
|
|
|
+ head)->perm;
|
|
|
+ for (i = 0; i < TOMOYO_MAX_PATH_NUMBER_OPERATION; i++)
|
|
|
+ if (perm & (1 << i))
|
|
|
+ count++;
|
|
|
+ break;
|
|
|
+ case TOMOYO_TYPE_PATH_NUMBER3_ACL:
|
|
|
+ perm = container_of(ptr, struct tomoyo_path_number3_acl,
|
|
|
+ head)->perm;
|
|
|
+ for (i = 0; i < TOMOYO_MAX_PATH_NUMBER3_OPERATION; i++)
|
|
|
+ if (perm & (1 << i))
|
|
|
+ count++;
|
|
|
+ break;
|
|
|
+ case TOMOYO_TYPE_MOUNT_ACL:
|
|
|
+ if (!container_of(ptr, struct tomoyo_mount_acl, head)->
|
|
|
+ is_deleted)
|
|
|
+ count++;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ if (count < tomoyo_check_flags(domain, TOMOYO_MAX_ACCEPT_ENTRY))
|
|
|
+ return true;
|
|
|
+ if (!domain->quota_warned) {
|
|
|
+ domain->quota_warned = true;
|
|
|
+ printk(KERN_WARNING "TOMOYO-WARNING: "
|
|
|
+ "Domain '%s' has so many ACLs to hold. "
|
|
|
+ "Stopped learning mode.\n", domain->domainname->name);
|
|
|
+ }
|
|
|
+ return false;
|
|
|
+}
|
Tetsuo Handa