This file contains common functions (e.g. policy I/O, pattern matching). ----- About pattern matching ----- In TOMOYO, all wildcard characters are in the form of '\' + one character. Many programs interpret a character with a backslash as literal character, but TOMOYO interprets all characters without a backslash as literal characters. Since the characters which are interpreted as wildcard are program dependent (e.g. For shells, '*' and '?' are wildcards but '.' isn't. For sed, '.' is a wildcard). Those who worry about some characters being interpreted as wildcard characters will add a backslash to every characters (e.g. \/\t\m\p\/\* ) without knowing whether '/' 't' 'm' 'p' '*' are wildcard characters or not. Not only this approach requires the interpreter to remove unneeded backslashes but also this approach keeps introduction of new wildcard characters away. For example, until yesterday, 'p' was a literal character and users had been allowed to add a backslash before 'p'. But, from today, '\p' is now a wildcard character and users are no longer allowed to add a backslash before 'p' if the users want to represent literal 'p'. If the interpreter forces users not to add a backslash to represent literal character, users must know all wildcard characters beforehand. On the contrary, TOMOYO's approach allows introduction of new wildcard characters as needed, for users won't add a backslash to represent literal characters. If the interpreter forces users to add a backslash to represent wildcard character, users needn't to know all wildcard characters beforehand. Users can learn the meaning of new wildcard characters on first encounter. You would go crazy with functions that handle string data. But these functions are needed to stay inside the kernel for validating, hashing and comparing string data. To speeds up string comparison, TOMOYO hashes strings using "depth" (number of '/' characters). This is calculated by tomoyo_path_depth() and used by tomoyo_path_matches_pattern(). To be able to use strncmp() where possible, TOMOYO remembers initial length of strings without wildcard characters. This is calculated by tomoyo_const_part_length(). To be able to use strcmp() where possible, TOMOYO remembers whether strings contains wildcard character or not. ----- About policy interface ----- TOMOYO Linux creates the following files on securityfs (normally mounted on /sys/kernel/security) as interfaces between kernel and userspace. These files are for TOMOYO Linux management tools *only*, not for general programs. * profile * exception_policy * domain_policy * manager * meminfo * self_domain * version * .domain_status * .process_status ** /sys/kernel/security/tomoyo/profile ** This file is used to read or write profiles. "profile" means a running mode of process. A profile lists up functions and their modes in "$number-$variable=$value" format. The $number is profile number between 0 and 255. Each domain is assigned one profile. To assign profile to domains, use "ccs-setprofile" or "ccs-editpolicy" or "ccs-loadpolicy" commands. (Example) [root@tomoyo]# cat /sys/kernel/security/tomoyo/profile 0-COMMENT=-----Disabled Mode----- 0-MAC_FOR_FILE=disabled 0-MAX_ACCEPT_ENTRY=2048 0-TOMOYO_VERBOSE=disabled 1-COMMENT=-----Learning Mode----- 1-MAC_FOR_FILE=learning 1-MAX_ACCEPT_ENTRY=2048 1-TOMOYO_VERBOSE=disabled 2-COMMENT=-----Permissive Mode----- 2-MAC_FOR_FILE=permissive 2-MAX_ACCEPT_ENTRY=2048 2-TOMOYO_VERBOSE=enabled 3-COMMENT=-----Enforcing Mode----- 3-MAC_FOR_FILE=enforcing 3-MAX_ACCEPT_ENTRY=2048 3-TOMOYO_VERBOSE=enabled - MAC_FOR_FILE: Specifies access control level regarding file access requests. - MAX_ACCEPT_ENTRY: Limits the max number of ACL entries that are automatically appended during learning mode. Default is 2048. - TOMOYO_VERBOSE: Specifies whether to print domain policy violation messages or not. ** /sys/kernel/security/tomoyo/manager ** This file is used to read or append the list of programs or domains that can write to /sys/kernel/security/tomoyo interface. By default, only processes with both UID = 0 and EUID = 0 can modify policy via /sys/kernel/security/tomoyo interface. You can use keyword "manage_by_non_root" to allow policy modification by non root user. (Example) [root@tomoyo]# cat /sys/kernel/security/tomoyo/manager /usr/lib/ccs/loadpolicy /usr/lib/ccs/editpolicy /usr/lib/ccs/setlevel /usr/lib/ccs/setprofile /usr/lib/ccs/ld-watch /usr/lib/ccs/ccs-queryd ** /sys/kernel/security/tomoyo/exception_policy ** This file is used to read and write system global settings. Each line has a directive and operand pair. Directives are listed below. - initialize_domain: To initialize domain transition when specific program is executed, use initialize_domain directive. * initialize_domain "program" from "domain" * initialize_domain "program" from "the last program part of domain" * initialize_domain "program" If the part "from" and after is not given, the entry is applied to all domain. If the "domain" doesn't start with "", the entry is applied to all domain whose domainname ends with "the last program part of domain". This directive is intended to aggregate domain transitions for daemon program and program that are invoked by the kernel on demand, by transiting to different domain. - keep_domain To prevent domain transition when program is executed from specific domain, use keep_domain directive. * keep_domain "program" from "domain" * keep_domain "program" from "the last program part of domain" * keep_domain "domain" * keep_domain "the last program part of domain" If the part "from" and before is not given, this entry is applied to all program. If the "domain" doesn't start with "", the entry is applied to all domain whose domainname ends with "the last program part of domain". This directive is intended to reduce total number of domains and memory usage by suppressing unneeded domain transitions. To declare domain keepers, use keep_domain directive followed by domain definition. Any process that belongs to any domain declared with this directive, the process stays at the same domain unless any program registered with initialize_domain directive is executed. In order to control domain transition in detail, you can use no_keep_domain/no_initialize_domain keywrods. - alias: To allow executing programs using the name of symbolic links, use alias keyword followed by dereferenced pathname and reference pathname. For example, /sbin/pidof is a symbolic link to /sbin/killall5 . In normal case, if /sbin/pidof is executed, the domain is defined as if /sbin/killall5 is executed. By specifying "alias /sbin/killall5 /sbin/pidof", you can run /sbin/pidof in the domain for /sbin/pidof . (Example) alias /sbin/killall5 /sbin/pidof - allow_read: To grant unconditionally readable permissions, use allow_read keyword followed by canonicalized file. This keyword is intended to reduce size of domain policy by granting read access to library files such as GLIBC and locale files. Exception is, if ignore_global_allow_read keyword is given to a domain, entries specified by this keyword are ignored. (Example) allow_read /lib/libc-2.5.so - file_pattern: To declare pathname pattern, use file_pattern keyword followed by pathname pattern. The pathname pattern must be a canonicalized Pathname. This keyword is not applicable to neither granting execute permissions nor domain definitions. For example, canonicalized pathname that contains a process ID (i.e. /proc/PID/ files) needs to be grouped in order to make access control work well. (Example) file_pattern /proc/\$/cmdline - path_group To declare pathname group, use path_group keyword followed by name of the group and pathname pattern. For example, if you want to group all files under home directory, you can define path_group HOME-DIR-FILE /home/\*/\* path_group HOME-DIR-FILE /home/\*/\*/\* path_group HOME-DIR-FILE /home/\*/\*/\*/\* in the exception policy and use like allow_read @HOME-DIR-FILE to grant file access permission. - deny_rewrite: To deny overwriting already written contents of file (such as log files) by default, use deny_rewrite keyword followed by pathname pattern. Files whose pathname match the patterns are not permitted to open for writing without append mode or truncate unless the pathnames are explicitly granted using allow_rewrite keyword in domain policy. (Example) deny_rewrite /var/log/\* - aggregator To deal multiple programs as a single program, use aggregator keyword followed by name of original program and aggregated program. This keyword is intended to aggregate similar programs. For example, /usr/bin/tac and /bin/cat are similar. By specifying "aggregator /usr/bin/tac /bin/cat", you can run /usr/bin/tac in the domain for /bin/cat . For example, /usr/sbin/logrotate for Fedora Core 3 generates programs like /tmp/logrotate.\?\?\?\?\?\? and run them, but TOMOYO Linux doesn't allow using patterns for granting execute permission and defining domains. By specifying "aggregator /tmp/logrotate.\?\?\?\?\?\? /tmp/logrotate.tmp", you can run /tmp/logrotate.\?\?\?\?\?\? as if /tmp/logrotate.tmp is running. ** /sys/kernel/security/tomoyo/domain_policy ** This file contains definition of all domains and permissions that are granted to each domain. Lines from the next line to a domain definition ( any lines starting with "") to the previous line to the next domain definitions are interpreted as access permissions for that domain. ** /sys/kernel/security/tomoyo/meminfo ** This file is to show the total RAM used to keep policy in the kernel by TOMOYO Linux in bytes. (Example) [root@tomoyo]# cat /sys/kernel/security/tomoyo/meminfo Shared: 61440 Private: 69632 Dynamic: 768 Total: 131840 You can set memory quota by writing to this file. (Example) [root@tomoyo]# echo Shared: 2097152 > /sys/kernel/security/tomoyo/meminfo [root@tomoyo]# echo Private: 2097152 > /sys/kernel/security/tomoyo/meminfo ** /sys/kernel/security/tomoyo/self_domain ** This file is to show the name of domain the caller process belongs to. (Example) [root@etch]# cat /sys/kernel/security/tomoyo/self_domain /usr/sbin/sshd /bin/zsh /bin/cat ** /sys/kernel/security/tomoyo/version ** This file is used for getting TOMOYO Linux's version. (Example) [root@etch]# cat /sys/kernel/security/tomoyo/version 2.2.0-pre ** /sys/kernel/security/tomoyo/.domain_status ** This is a view (of a DBMS) that contains only profile number and domainnames of domain so that "ccs-setprofile" command can do line-oriented processing easily. ** /sys/kernel/security/tomoyo/.process_status ** This file is used by "ccs-ccstree" command to show "list of processes currently running" and "domains which each process belongs to" and "profile number which the domain is currently assigned" like "pstree" command. This file is writable by programs that aren't registered as policy manager. Signed-off-by: Kentaro Takeda Signed-off-by: Tetsuo Handa Signed-off-by: Toshiharu Harada --- security/tomoyo/common.c | 2160 +++++++++++++++++++++++++++++++++++++++++++++++ security/tomoyo/common.h | 337 +++++++ 2 files changed, 2497 insertions(+) --- /dev/null +++ linux-2.6.28-rc5-mm1/security/tomoyo/common.c @@ -0,0 +1,2160 @@ +/* + * security/tomoyo/common.c + * + * Common functions for TOMOYO. + * + * Copyright (C) 2005-2008 NTT DATA CORPORATION + * + * Version: 2.2.0-pre 2008/11/11 + * + */ + +#include +#include +#include +#include "realpath.h" +#include "common.h" +#include "tomoyo.h" + +/* Has loading policy done? */ +bool tomoyo_policy_loaded; + +/* String table for functionality that takes 4 modes. */ +static const char *tomoyo_mode_4[4] = { + "disabled", "learning", "permissive", "enforcing" +}; +/* String table for functionality that takes 2 modes. */ +static const char *tomoyo_mode_2[4] = { + "disabled", "enabled", "enabled", "enabled" +}; + +/* Table for profile. */ +static struct { + const char *keyword; + unsigned int current_value; + const unsigned int max_value; +} tomoyo_control_array[TOMOYO_MAX_CONTROL_INDEX] = { + [TOMOYO_MAC_FOR_FILE] = { "MAC_FOR_FILE", 0, 3 }, + [TOMOYO_MAX_ACCEPT_ENTRY] = { "MAX_ACCEPT_ENTRY", 2048, INT_MAX }, + [TOMOYO_VERBOSE] = { "TOMOYO_VERBOSE", 1, 1 }, +}; + +/* Profile table. Memory is allocated as needed. */ +static struct tomoyo_profile { + unsigned int value[TOMOYO_MAX_CONTROL_INDEX]; + const struct tomoyo_path_info *comment; +} *tomoyo_profile_ptr[TOMOYO_MAX_PROFILES]; + +/* Permit policy management by non-root user? */ +static bool tomoyo_manage_by_non_root; + +/* Utility functions. */ + +/* Open operation for /sys/kernel/security/tomoyo/ interface. */ +static int tomoyo_open_control(const u8 type, struct file *file); +/* Close /sys/kernel/security/tomoyo/ interface. */ +static int tomoyo_close_control(struct file *file); +/* Read operation for /sys/kernel/security/tomoyo/ interface. */ +static int tomoyo_read_control(struct file *file, char __user *buffer, + const int buffer_len); +/* Write operation for /sys/kernel/security/tomoyo/ interface. */ +static int tomoyo_write_control(struct file *file, const char __user *buffer, + const int buffer_len); + +/** + * tomoyo_is_byte_range - Check whether the string isa \ooo style octal value. + * + * @str: Pointer to the string. + * + * Returns true if @str is a \ooo style octal value, false otherwise. + * + * TOMOYO uses \ooo style representation for 0x01 - 0x20 and 0x7F - 0xFF. + * This function verifies that \ooo is in valid range. + */ +static inline bool tomoyo_is_byte_range(const char *str) +{ + return *str >= '0' && *str++ <= '3' && + *str >= '0' && *str++ <= '7' && + *str >= '0' && *str <= '7'; +} + +/** + * tomoyo_is_alphabet_char - Check whether the character is an alphabet. + * + * @c: The character to check. + * + * Returns true if @c is an alphabet character, false otherwise. + */ +static inline bool tomoyo_is_alphabet_char(const char c) +{ + return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z'); +} + +/** + * tomoyo_make_byte - Make byte value from three octal characters. + * + * @c1: The first character. + * @c2: The second character. + * @c3: The third character. + * + * Returns byte value. + */ +static inline u8 tomoyo_make_byte(const u8 c1, const u8 c2, const u8 c3) +{ + return ((c1 - '0') << 6) + ((c2 - '0') << 3) + (c3 - '0'); +} + +/** + * tomoyo_str_starts - Check whether the given string starts with the given keyword. + * + * @src: Pointer to pointer to the string. + * @find: Pointer to the keyword. + * + * Returns true if @src starts with @find, false otherwise. + * + * The @src is updated to point the first character after the @find + * if @src starts with @find. + */ +static bool tomoyo_str_starts(char **src, const char *find) +{ + const int len = strlen(find); + char *tmp = *src; + + if (strncmp(tmp, find, len)) + return false; + tmp += len; + *src = tmp; + return true; +} + +/** + * tomoyo_normalize_line - Format string. + * + * @buffer: The line to normalize. + * + * Leading and trailing whitespaces are removed. + * Multiple whitespaces are packed into single space. + * + * Returns nothing. + */ +static void tomoyo_normalize_line(unsigned char *buffer) +{ + unsigned char *sp = buffer; + unsigned char *dp = buffer; + bool first = true; + + while (tomoyo_is_invalid(*sp)) + sp++; + while (*sp) { + if (!first) + *dp++ = ' '; + first = false; + while (tomoyo_is_valid(*sp)) + *dp++ = *sp++; + while (tomoyo_is_invalid(*sp)) + sp++; + } + *dp = '\0'; +} + +/** + * tomoyo_is_correct_path - Validate a pathname. + * @filename: The pathname to check. + * @start_type: Should the pathname start with '/'? + * 1 = must / -1 = must not / 0 = don't care + * @pattern_type: Can the pathname contain a wildcard? + * 1 = must / -1 = must not / 0 = don't care + * @end_type: Should the pathname end with '/'? + * 1 = must / -1 = must not / 0 = don't care + * @function: The name of function calling me. + * + * Check whether the given filename follows the naming rules. + * Returns true if @filename follows the naming rules, false otherwise. + */ +bool tomoyo_is_correct_path(const char *filename, const s8 start_type, + const s8 pattern_type, const s8 end_type, + const char *function) +{ + bool contains_pattern = false; + unsigned char c; + unsigned char d; + unsigned char e; + const char *original_filename = filename; + + if (!filename) + goto out; + c = *filename; + if (start_type == 1) { /* Must start with '/' */ + if (c != '/') + goto out; + } else if (start_type == -1) { /* Must not start with '/' */ + if (c == '/') + goto out; + } + if (c) + c = *(filename + strlen(filename) - 1); + if (end_type == 1) { /* Must end with '/' */ + if (c != '/') + goto out; + } else if (end_type == -1) { /* Must not end with '/' */ + if (c == '/') + goto out; + } + while ((c = *filename++) != '\0') { + if (c == '\\') { + switch ((c = *filename++)) { + case '\\': /* "\\" */ + continue; + case '$': /* "\$" */ + case '+': /* "\+" */ + case '?': /* "\?" */ + case '*': /* "\*" */ + case '@': /* "\@" */ + case 'x': /* "\x" */ + case 'X': /* "\X" */ + case 'a': /* "\a" */ + case 'A': /* "\A" */ + case '-': /* "\-" */ + if (pattern_type == -1) + break; /* Must not contain pattern */ + contains_pattern = true; + continue; + case '0': /* "\ooo" */ + case '1': + case '2': + case '3': + d = *filename++; + if (d < '0' || d > '7') + break; + e = *filename++; + if (e < '0' || e > '7') + break; + c = tomoyo_make_byte(c, d, e); + if (tomoyo_is_invalid(c)) + continue; /* pattern is not \000 */ + } + goto out; + } else if (tomoyo_is_invalid(c)) { + goto out; + } + } + if (pattern_type == 1) { /* Must contain pattern */ + if (!contains_pattern) + goto out; + } + return true; + out: + printk(KERN_DEBUG "%s: Invalid pathname '%s'\n", function, + original_filename); + return false; +} + +/** + * tomoyo_is_correct_domain - Check whether the given domainname follows the naming rules. + * @domainname: The domainname to check. + * @function: The name of function calling me. + * + * Returns true if @domainname follows the naming rules, false otherwise. + */ +bool tomoyo_is_correct_domain(const unsigned char *domainname, + const char *function) +{ + unsigned char c; + unsigned char d; + unsigned char e; + const char *org_domainname = domainname; + + if (!domainname || strncmp(domainname, TOMOYO_ROOT_NAME, + TOMOYO_ROOT_NAME_LEN)) + goto out; + domainname += TOMOYO_ROOT_NAME_LEN; + if (!*domainname) + return true; + do { + if (*domainname++ != ' ') + goto out; + if (*domainname++ != '/') + goto out; + while ((c = *domainname) != '\0' && c != ' ') { + domainname++; + if (c == '\\') { + c = *domainname++; + switch ((c)) { + case '\\': /* "\\" */ + continue; + case '0': /* "\ooo" */ + case '1': + case '2': + case '3': + d = *domainname++; + if (d < '0' || d > '7') + break; + e = *domainname++; + if (e < '0' || e > '7') + break; + c = tomoyo_make_byte(c, d, e); + if (tomoyo_is_invalid(c)) + /* pattern is not \000 */ + continue; + } + goto out; + } else if (tomoyo_is_invalid(c)) { + goto out; + } + } + } while (*domainname); + return true; + out: + printk(KERN_DEBUG "%s: Invalid domainname '%s'\n", function, + org_domainname); + 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. + */ +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); + list1_for_each_entry(domain, &tomoyo_domain_list, list) { + if (!domain->is_deleted && + !tomoyo_pathcmp(&name, domain->domainname)) + return domain; + } + return NULL; +} + +/** + * tomoyo_path_depth - Evaluate the number of '/' in a string. + * + * @pathname: The string to evaluate. + * + * Returns path depth of the string. + * + * I score 2 for each of the '/' in the @pathname + * and score 1 if the @pathname ends with '/'. + */ +static int tomoyo_path_depth(const char *pathname) +{ + int i = 0; + + if (pathname) { + const char *ep = pathname + strlen(pathname); + if (pathname < ep--) { + if (*ep != '/') + i++; + while (pathname <= ep) + if (*ep-- == '/') + i += 2; + } + } + return i; +} + +/** + * 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->total_len = len; + 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); + ptr->depth = tomoyo_path_depth(name); +} + +/** + * tomoyo_file_matches_to_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_to_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_to_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_to_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_to_pattern - Pattern matching without 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_to_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_to_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_to_pattern2(filename, filename_end, + pattern_start, pattern_end); + return first ? result : !result; +} + +/** + * 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. + * \* More than or equals to 0 character other than '/'. + * \@ More than or equals to 0 character other than '/' or '.'. + * \? 1 byte character other than '/'. + * \$ More than or equals to 1 decimal digit. + * \+ 1 decimal digit. + * \X More than or equals to 1 hexadecimal digit. + * \x 1 hexadecimal digit. + * \A More than or equals to 1 alphabet character. + * \a 1 alphabet character. + * \- Subtraction operator. + */ +bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename, + const struct tomoyo_path_info *pattern) +{ + /* + if (!filename || !pattern) + return false; + */ + 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); + /* Dont compare if the number of '/' differs. */ + if (filename->depth != pattern->depth) + return false; + /* Compare the initial length without patterns. */ + if (strncmp(f, p, len)) + return false; + f += len; + p += len; + /* Main loop. Compare each directory component. */ + while (*f && *p) { + const char *f_delimiter = strchr(f, '/'); + const char *p_delimiter = strchr(p, '/'); + if (!f_delimiter) + f_delimiter = f + strlen(f); + if (!p_delimiter) + p_delimiter = p + strlen(p); + if (!tomoyo_file_matches_to_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; +} + +/** + * tomoyo_io_printf - Transactional printf() to "struct tomoyo_io_buffer" structure. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * @fmt: The printf()'s format string, followed by parameters. + * + * Returns true if output was written, false otherwise. + * + * The snprintf() will truncate, but tomoyo_io_printf() won't. + */ +bool tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...) +{ + va_list args; + int len; + int pos = head->read_avail; + int size = head->readbuf_size - pos; + + if (size <= 0) + return false; + va_start(args, fmt); + len = vsnprintf(head->read_buf + pos, size, fmt, args); + va_end(args); + if (pos + len >= head->readbuf_size) + return false; + head->read_avail += len; + return true; +} + +/** + * tomoyo_get_exe - Get tomoyo_realpath() of current process. + * + * Returns the tomoyo_realpath() of current process on success, NULL otherwise. + * + * This function uses tomoyo_alloc(), so the caller must call tomoyo_free() + * if this function didn't return NULL. + */ +static 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_get_msg - Get warning message. + * + * @is_enforce: Is it enforcing mode? + * + * Returns "ERROR" or "WARNING". + */ +const char *tomoyo_get_msg(const bool is_enforce) +{ + if (is_enforce) + return "ERROR"; + else + return "WARNING"; +} + +/** + * tomoyo_check_flags - Check mode for specified functionality. + * + * @domain: Pointer to "struct tomoyo_domain_info". + * @index: The functionality to check mode. + * + * TOMOYO checks only process context. + * This code disables TOMOYO's enforcement in case the function is called from + * interrupt context. + */ +unsigned int tomoyo_check_flags(const struct tomoyo_domain_info *domain, + const u8 index) +{ + const u8 profile = domain->profile; + + if (WARN_ON(in_interrupt())) + return 0; + return tomoyo_policy_loaded && index < TOMOYO_MAX_CONTROL_INDEX +#if TOMOYO_MAX_PROFILES != 256 + && profile < TOMOYO_MAX_PROFILES +#endif + && tomoyo_profile_ptr[profile] ? + tomoyo_profile_ptr[profile]->value[index] : 0; +} + +/** + * tomoyo_verbose_mode - Check whether TOMOYO is verbose mode. + * + * @domain: Pointer to "struct tomoyo_domain_info". + * + * Returns true if domain policy violation warning should be printed to + * console. + */ +bool tomoyo_verbose_mode(const struct tomoyo_domain_info *domain) +{ + return tomoyo_check_flags(domain, TOMOYO_VERBOSE) != 0; +} + +/** + * tomoyo_domain_quota_is_ok - Check for domain's quota. + * + * @domain: Pointer to "struct tomoyo_domain_info". + * + * Returns true if the domain is not exceeded quota, false otherwise. + */ +bool tomoyo_domain_quota_is_ok(struct tomoyo_domain_info * const domain) +{ + unsigned int count = 0; + struct tomoyo_acl_info *ptr; + + if (!domain) + return true; + list1_for_each_entry(ptr, &domain->acl_info_list, list) { + if (ptr->type & TOMOYO_ACL_DELETED) + continue; + switch (tomoyo_acl_type2(ptr)) { + struct tomoyo_single_path_acl_record *acl1; + struct tomoyo_double_path_acl_record *acl2; + u16 perm; + case TOMOYO_TYPE_SINGLE_PATH_ACL: + acl1 = container_of(ptr, + struct tomoyo_single_path_acl_record, + head); + perm = acl1->perm; + if (perm & (1 << TOMOYO_TYPE_EXECUTE_ACL)) + count++; + if (perm & + ((1 << TOMOYO_TYPE_READ_ACL) | + (1 << TOMOYO_TYPE_WRITE_ACL))) + count++; + if (perm & (1 << TOMOYO_TYPE_CREATE_ACL)) + count++; + if (perm & (1 << TOMOYO_TYPE_UNLINK_ACL)) + count++; + if (perm & (1 << TOMOYO_TYPE_MKDIR_ACL)) + count++; + if (perm & (1 << TOMOYO_TYPE_RMDIR_ACL)) + count++; + if (perm & (1 << TOMOYO_TYPE_MKFIFO_ACL)) + count++; + if (perm & (1 << TOMOYO_TYPE_MKSOCK_ACL)) + count++; + if (perm & (1 << TOMOYO_TYPE_MKBLOCK_ACL)) + count++; + if (perm & (1 << TOMOYO_TYPE_MKCHAR_ACL)) + count++; + if (perm & (1 << TOMOYO_TYPE_TRUNCATE_ACL)) + count++; + if (perm & (1 << TOMOYO_TYPE_SYMLINK_ACL)) + count++; + if (perm & (1 << TOMOYO_TYPE_REWRITE_ACL)) + count++; + break; + case TOMOYO_TYPE_DOUBLE_PATH_ACL: + acl2 = container_of(ptr, + struct tomoyo_double_path_acl_record, + head); + perm = acl2->perm; + if (perm & (1 << TOMOYO_TYPE_LINK_ACL)) + count++; + if (perm & (1 << TOMOYO_TYPE_RENAME_ACL)) + count++; + break; + } + } + 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; +} + +/** + * tomoyo_find_or_assign_new_profile - Create a new profile. + * + * @profile: Profile number to create. + * + * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise. + */ +static struct tomoyo_profile *tomoyo_find_or_assign_new_profile(const unsigned + int profile) +{ + static DEFINE_MUTEX(lock); + struct tomoyo_profile *ptr = NULL; + int i; + + if (profile >= TOMOYO_MAX_PROFILES) + return NULL; + /***** EXCLUSIVE SECTION START *****/ + mutex_lock(&lock); + ptr = tomoyo_profile_ptr[profile]; + if (ptr) + goto ok; + ptr = tomoyo_alloc_element(sizeof(*ptr)); + if (!ptr) + goto ok; + for (i = 0; i < TOMOYO_MAX_CONTROL_INDEX; i++) + ptr->value[i] = tomoyo_control_array[i].current_value; + mb(); /* Avoid out-of-order execution. */ + tomoyo_profile_ptr[profile] = ptr; + ok: + mutex_unlock(&lock); + /***** EXCLUSIVE SECTION END *****/ + return ptr; +} + +/** + * tomoyo_write_profile - Write to profile table. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns 0 on success, negative value otherwise. + */ +static int tomoyo_write_profile(struct tomoyo_io_buffer *head) +{ + char *data = head->write_buf; + unsigned int i; + unsigned int value; + char *cp; + struct tomoyo_profile *profile; + unsigned long num; + + cp = strchr(data, '-'); + if (cp) + *cp = '\0'; + if (strict_strtoul(data, 10, &num)) + return -EINVAL; + if (cp) + data = cp + 1; + profile = tomoyo_find_or_assign_new_profile(num); + if (!profile) + return -EINVAL; + cp = strchr(data, '='); + if (!cp) + return -EINVAL; + *cp = '\0'; + if (!strcmp(data, "COMMENT")) { + profile->comment = tomoyo_save_name(cp + 1); + return 0; + } + for (i = 0; i < TOMOYO_MAX_CONTROL_INDEX; i++) { + if (strcmp(data, tomoyo_control_array[i].keyword)) + continue; + if (sscanf(cp + 1, "%u", &value) != 1) { + int j; + const char **modes; + switch (i) { + case TOMOYO_VERBOSE: + modes = tomoyo_mode_2; + break; + default: + modes = tomoyo_mode_4; + break; + } + for (j = 0; j < 4; j++) { + if (strcmp(cp + 1, modes[j])) + continue; + value = j; + break; + } + if (j == 4) + return -EINVAL; + } else if (value > tomoyo_control_array[i].max_value) { + value = tomoyo_control_array[i].max_value; + } + profile->value[i] = value; + return 0; + } + return -EINVAL; +} + +/** + * tomoyo_read_profile - Read from profile table. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns 0. + */ +static int tomoyo_read_profile(struct tomoyo_io_buffer *head) +{ + static const int total = TOMOYO_MAX_CONTROL_INDEX + 1; + int step; + + if (head->read_eof) + return 0; + for (step = head->read_step; step < TOMOYO_MAX_PROFILES * total; + step++) { + const u8 index = step / total; + u8 type = step % total; + const struct tomoyo_profile *profile + = tomoyo_profile_ptr[index]; + head->read_step = step; + if (!profile) + continue; + if (!type) { /* Print profile' comment tag. */ + if (!tomoyo_io_printf(head, "%u-COMMENT=%s\n", + index, profile->comment ? + profile->comment->name : "")) + break; + continue; + } + type--; + if (type < TOMOYO_MAX_CONTROL_INDEX) { + const unsigned int value = profile->value[type]; + const char **modes = NULL; + const char *keyword + = tomoyo_control_array[type].keyword; + switch (tomoyo_control_array[type].max_value) { + case 3: + modes = tomoyo_mode_4; + break; + case 1: + modes = tomoyo_mode_2; + break; + } + if (modes) { + if (!tomoyo_io_printf(head, "%u-%s=%s\n", index, + keyword, modes[value])) + break; + } else { + if (!tomoyo_io_printf(head, "%u-%s=%u\n", index, + keyword, value)) + break; + } + } + } + if (step == TOMOYO_MAX_PROFILES * total) + head->read_eof = true; + return 0; +} + +/* Structure for policy manager. */ +struct tomoyo_policy_manager_entry { + struct list1_head list; + /* A path to program or a domainname. */ + const struct tomoyo_path_info *manager; + bool is_domain; /* True if manager is a domainname. */ + bool is_deleted; /* True if this entry is deleted. */ +}; + +/* + * The list for "struct tomoyo_policy_manager_entry". + * + * This list is updated only inside update_manager_entry(), thus + * no global mutex exists. + */ +static LIST1_HEAD(tomoyo_policy_manager_list); + +/** + * tomoyo_update_manager_entry - Add a manager entry. + * + * @manager: The path to manager or the domainnamme. + * @is_delete: True if it is a delete request. + * + * Returns 0 on success, negative value otherwise. + */ +static int tomoyo_update_manager_entry(const char *manager, + const bool is_delete) +{ + struct tomoyo_policy_manager_entry *new_entry; + struct tomoyo_policy_manager_entry *ptr; + static DEFINE_MUTEX(lock); + const struct tomoyo_path_info *saved_manager; + int error = -ENOMEM; + bool is_domain = false; + + if (tomoyo_is_domain_def(manager)) { + if (!tomoyo_is_correct_domain(manager, __func__)) + return -EINVAL; + is_domain = true; + } else { + if (!tomoyo_is_correct_path(manager, 1, -1, -1, __func__)) + return -EINVAL; + } + saved_manager = tomoyo_save_name(manager); + if (!saved_manager) + return -ENOMEM; + /***** EXCLUSIVE SECTION START *****/ + mutex_lock(&lock); + list1_for_each_entry(ptr, &tomoyo_policy_manager_list, list) { + if (ptr->manager != saved_manager) + continue; + ptr->is_deleted = is_delete; + error = 0; + goto out; + } + if (is_delete) { + error = -ENOENT; + goto out; + } + new_entry = tomoyo_alloc_element(sizeof(*new_entry)); + if (!new_entry) + goto out; + new_entry->manager = saved_manager; + new_entry->is_domain = is_domain; + list1_add_tail(&new_entry->list, &tomoyo_policy_manager_list); + error = 0; + out: + mutex_unlock(&lock); + /***** EXCLUSIVE SECTION END *****/ + return error; +} + +/** + * tomoyo_write_manager_policy - Write manager policy. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns 0 on success, negative value otherwise. + */ +static int tomoyo_write_manager_policy(struct tomoyo_io_buffer *head) +{ + char *data = head->write_buf; + bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE); + + if (!strcmp(data, "manage_by_non_root")) { + tomoyo_manage_by_non_root = !is_delete; + return 0; + } + return tomoyo_update_manager_entry(data, is_delete); +} + +/** + * tomoyo_read_manager_policy - Read manager policy. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns 0. + */ +static int tomoyo_read_manager_policy(struct tomoyo_io_buffer *head) +{ + struct list1_head *pos; + + if (head->read_eof) + return 0; + list1_for_each_cookie(pos, head->read_var2, + &tomoyo_policy_manager_list) { + struct tomoyo_policy_manager_entry *ptr; + ptr = list1_entry(pos, struct tomoyo_policy_manager_entry, + list); + if (ptr->is_deleted) + continue; + if (!tomoyo_io_printf(head, "%s\n", ptr->manager->name)) + return 0; + } + head->read_eof = true; + return 0; +} + +/** + * tomoyo_is_policy_manager - Check whether the current process is a policy manager. + * + * Returns true if the current process is permitted to modify policy + * via /sys/kernel/security/tomoyo/ interface. + */ +static bool tomoyo_is_policy_manager(void) +{ + struct tomoyo_policy_manager_entry *ptr; + const char *exe; + const struct task_struct *task = current; + const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname; + bool found = false; + + if (!tomoyo_policy_loaded) + return true; + if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid)) + return false; + list1_for_each_entry(ptr, &tomoyo_policy_manager_list, list) { + if (!ptr->is_deleted && ptr->is_domain + && !tomoyo_pathcmp(domainname, ptr->manager)) + return true; + } + exe = tomoyo_get_exe(); + if (!exe) + return false; + list1_for_each_entry(ptr, &tomoyo_policy_manager_list, list) { + if (!ptr->is_deleted && !ptr->is_domain + && !strcmp(exe, ptr->manager->name)) { + found = true; + break; + } + } + if (!found) { /* Reduce error messages. */ + static pid_t last_pid; + const pid_t pid = current->pid; + if (last_pid != pid) { + printk(KERN_WARNING "%s ( %s ) is not permitted to " + "update policies.\n", domainname->name, exe); + last_pid = pid; + } + } + tomoyo_free(exe); + return found; +} + +/** + * tomoyo_is_select_one - Parse select command. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * @data: String to parse. + * + * Returns true on success, false otherwise. + */ +static bool tomoyo_is_select_one(struct tomoyo_io_buffer *head, + const char *data) +{ + unsigned int pid; + struct tomoyo_domain_info *domain = NULL; + + if (sscanf(data, "pid=%u", &pid) == 1) { + struct task_struct *p; + /***** CRITICAL SECTION START *****/ + read_lock(&tasklist_lock); + p = find_task_by_vpid(pid); + if (p) + domain = tomoyo_real_domain(p); + read_unlock(&tasklist_lock); + /***** CRITICAL SECTION END *****/ + } else if (!strncmp(data, "domain=", 7)) { + if (tomoyo_is_domain_def(data + 7)) + domain = tomoyo_find_domain(data + 7); + } else + return false; + head->write_var1 = domain; + /* Accessing read_buf is safe because head->io_sem is held. */ + if (!head->read_buf) + return true; /* Do nothing if open(O_WRONLY). */ + head->read_avail = 0; + tomoyo_io_printf(head, "# select %s\n", data); + head->read_single_domain = true; + head->read_eof = !domain; + if (domain) { + struct tomoyo_domain_info *d; + head->read_var1 = NULL; + list1_for_each_entry(d, &tomoyo_domain_list, list) { + if (d == domain) + break; + head->read_var1 = &d->list; + } + head->read_var2 = NULL; + head->read_bit = 0; + head->read_step = 0; + if (domain->is_deleted) + tomoyo_io_printf(head, "# This is a deleted domain.\n"); + } + return true; +} + +/** + * tomoyo_write_domain_policy - Write domain policy. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns 0 on success, negative value otherwise. + */ +static int tomoyo_write_domain_policy(struct tomoyo_io_buffer *head) +{ + char *data = head->write_buf; + struct tomoyo_domain_info *domain = head->write_var1; + bool is_delete = false; + bool is_select = false; + bool is_undelete = false; + unsigned int profile; + + if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE)) + is_delete = true; + else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_SELECT)) + is_select = true; + else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_UNDELETE)) + is_undelete = true; + if (is_select && tomoyo_is_select_one(head, data)) + return 0; + /* Don't allow updating policies by non manager programs. */ + if (!tomoyo_is_policy_manager()) + return -EPERM; + if (tomoyo_is_domain_def(data)) { + domain = NULL; + if (is_delete) + tomoyo_delete_domain(data); + else if (is_select) + domain = tomoyo_find_domain(data); + else if (is_undelete) + domain = tomoyo_undelete_domain(data); + else + domain = tomoyo_find_or_assign_new_domain(data, 0); + head->write_var1 = domain; + return 0; + } + if (!domain) + return -EINVAL; + + if (sscanf(data, TOMOYO_KEYWORD_USE_PROFILE "%u", &profile) == 1 + && profile < TOMOYO_MAX_PROFILES) { + if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded) + domain->profile = (u8) profile; + return 0; + } + if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) { + tomoyo_set_domain_flag(domain, is_delete, + TOMOYO_DOMAIN_FLAGS_IGNORE_GLOBAL_ALLOW_READ); + return 0; + } + return tomoyo_write_file_policy(data, domain, is_delete); +} + +/** + * tomoyo_print_single_path_acl - Print a single path ACL entry. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * @ptr: Pointer to "struct tomoyo_single_path_acl_record". + * + * Returns true on success, false otherwise. + */ +static bool tomoyo_print_single_path_acl(struct tomoyo_io_buffer *head, + struct tomoyo_single_path_acl_record * + ptr) +{ + int pos; + u8 bit; + const char *atmark = ""; + const char *filename; + const u16 perm = ptr->perm; + + filename = ptr->filename->name; + for (bit = head->read_bit; bit < TOMOYO_MAX_SINGLE_PATH_OPERATION; + bit++) { + const char *msg; + if (!(perm & (1 << bit))) + continue; + /* Print "read/write" instead of "read" and "write". */ + if ((bit == TOMOYO_TYPE_READ_ACL || + bit == TOMOYO_TYPE_WRITE_ACL) + && (perm & (1 << TOMOYO_TYPE_READ_WRITE_ACL))) + continue; + msg = tomoyo_sp2keyword(bit); + pos = head->read_avail; + if (!tomoyo_io_printf(head, "allow_%s %s%s\n", msg, + atmark, filename)) + goto out; + } + head->read_bit = 0; + return true; + out: + head->read_bit = bit; + head->read_avail = pos; + return false; +} + +/** + * tomoyo_print_double_path_acl - Print a double path ACL entry. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * @ptr: Pointer to "struct tomoyo_double_path_acl_record". + * + * Returns true on success, false otherwise. + */ +static bool tomoyo_print_double_path_acl(struct tomoyo_io_buffer *head, + struct tomoyo_double_path_acl_record * + ptr) +{ + int pos; + const char *atmark1 = ""; + const char *atmark2 = ""; + const char *filename1; + const char *filename2; + const u8 perm = ptr->perm; + u8 bit; + + filename1 = ptr->filename1->name; + filename2 = ptr->filename2->name; + for (bit = head->read_bit; bit < TOMOYO_MAX_DOUBLE_PATH_OPERATION; + bit++) { + const char *msg; + if (!(perm & (1 << bit))) + continue; + msg = tomoyo_dp2keyword(bit); + pos = head->read_avail; + if (!tomoyo_io_printf(head, "allow_%s %s%s %s%s\n", msg, + atmark1, filename1, atmark2, filename2)) + goto out; + } + head->read_bit = 0; + return true; + out: + head->read_bit = bit; + head->read_avail = pos; + return false; +} + +/** + * tomoyo_print_entry - Print an ACL entry. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * @ptr: Pointer to an ACL entry. + * + * Returns true on success, false otherwise. + */ +static bool tomoyo_print_entry(struct tomoyo_io_buffer *head, + struct tomoyo_acl_info *ptr) +{ + const u8 acl_type = tomoyo_acl_type2(ptr); + + if (acl_type & TOMOYO_ACL_DELETED) + return true; + if (acl_type == TOMOYO_TYPE_SINGLE_PATH_ACL) { + struct tomoyo_single_path_acl_record *acl + = container_of(ptr, + struct tomoyo_single_path_acl_record, + head); + return tomoyo_print_single_path_acl(head, acl); + } + if (acl_type == TOMOYO_TYPE_DOUBLE_PATH_ACL) { + struct tomoyo_double_path_acl_record *acl + = container_of(ptr, + struct tomoyo_double_path_acl_record, + head); + return tomoyo_print_double_path_acl(head, acl); + } + BUG(); /* This must not happen. */ + return false; +} + +/** + * tomoyo_read_domain_policy - Read domain policy. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns 0. + */ +static int tomoyo_read_domain_policy(struct tomoyo_io_buffer *head) +{ + struct list1_head *dpos; + struct list1_head *apos; + + if (head->read_eof) + return 0; + if (head->read_step == 0) + head->read_step = 1; + list1_for_each_cookie(dpos, head->read_var1, &tomoyo_domain_list) { + struct tomoyo_domain_info *domain; + const char *quota_exceeded = ""; + const char *transition_failed = ""; + const char *ignore_global_allow_read = ""; + domain = list1_entry(dpos, struct tomoyo_domain_info, list); + if (head->read_step != 1) + goto acl_loop; + if (domain->is_deleted && !head->read_single_domain) + continue; + /* Print domainname and flags. */ + if (domain->quota_warned) + quota_exceeded = "quota_exceeded\n"; + if (domain->flags & TOMOYO_DOMAIN_FLAGS_TRANSITION_FAILED) + transition_failed = "transition_failed\n"; + if (domain->flags & + TOMOYO_DOMAIN_FLAGS_IGNORE_GLOBAL_ALLOW_READ) + ignore_global_allow_read + = TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "\n"; + if (!tomoyo_io_printf(head, + "%s\n" TOMOYO_KEYWORD_USE_PROFILE "%u\n" + "%s%s%s\n", domain->domainname->name, + domain->profile, quota_exceeded, + transition_failed, + ignore_global_allow_read)) + return 0; + head->read_step = 2; +acl_loop: + if (head->read_step == 3) + goto tail_mark; + /* Print ACL entries in the domain. */ + list1_for_each_cookie(apos, head->read_var2, + &domain->acl_info_list) { + struct tomoyo_acl_info *ptr + = list1_entry(apos, struct tomoyo_acl_info, + list); + if (!tomoyo_print_entry(head, ptr)) + return 0; + } + head->read_step = 3; +tail_mark: + if (!tomoyo_io_printf(head, "\n")) + return 0; + head->read_step = 1; + if (head->read_single_domain) + break; + } + head->read_eof = true; + return 0; +} + +/** + *tomoyo_write_domain_profile - Assign profile for specified domain. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns 0 on success, -EINVAL otherwise. + * + * This is equivalent to doing + * + * ( echo "select " $domainname; echo "use_profile " $profile ) | + * /usr/lib/ccs/loadpolicy -d + */ +static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head) +{ + char *data = head->write_buf; + char *cp = strchr(data, ' '); + struct tomoyo_domain_info *domain; + unsigned long profile; + + if (!cp) + return -EINVAL; + *cp = '\0'; + domain = tomoyo_find_domain(cp + 1); + if (strict_strtoul(data, 10, &profile)) + return -EINVAL; + if (domain && profile < TOMOYO_MAX_PROFILES + && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)) + domain->profile = (u8) profile; + return 0; +} + +/** + * tomoyo_read_domain_profile - Read only domainname and profile. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns list of profile number and domainname pairs. + * + * This is equivalent to doing + * + * grep -A 1 '^' /sys/kernel/security/tomoyo/domain_policy | + * awk ' { if ( domainname == "" ) { if ( $1 == "" ) + * domainname = $0; } else if ( $1 == "use_profile" ) { + * print $2 " " domainname; domainname = ""; } } ; ' + */ +static int tomoyo_read_domain_profile(struct tomoyo_io_buffer *head) +{ + struct list1_head *pos; + + if (head->read_eof) + return 0; + list1_for_each_cookie(pos, head->read_var1, &tomoyo_domain_list) { + struct tomoyo_domain_info *domain; + domain = list1_entry(pos, struct tomoyo_domain_info, list); + if (domain->is_deleted) + continue; + if (!tomoyo_io_printf(head, "%u %s\n", domain->profile, + domain->domainname->name)) + return 0; + } + head->read_eof = true; + return 0; +} + +/** + * tomoyo_write_pid: Specify PID to obtain domainname. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns 0. + */ +static int tomoyo_write_pid(struct tomoyo_io_buffer *head) +{ + unsigned long pid; + /* No error check. */ + strict_strtoul(head->write_buf, 10, &pid); + head->read_step = (int) pid; + head->read_eof = false; + return 0; +} + +/** + * tomoyo_read_pid - Get domainname of the specified PID. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns the domainname which the specified PID is in on success, + * empty string otherwise. + * The PID is specified by tomoyo_write_pid() so that the user can obtain + * using read()/write() interface rather than sysctl() interface. + */ +static int tomoyo_read_pid(struct tomoyo_io_buffer *head) +{ + if (head->read_avail == 0 && !head->read_eof) { + const int pid = head->read_step; + struct task_struct *p; + struct tomoyo_domain_info *domain = NULL; + /***** CRITICAL SECTION START *****/ + read_lock(&tasklist_lock); + p = find_task_by_vpid(pid); + if (p) + domain = tomoyo_real_domain(p); + read_unlock(&tasklist_lock); + /***** CRITICAL SECTION END *****/ + if (domain) + tomoyo_io_printf(head, "%d %u %s", pid, domain->profile, + domain->domainname->name); + head->read_eof = true; + } + return 0; +} + +/** + * tomoyo_write_exception_policy - Write exception policy. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns 0 on success, negative value otherwise. + */ +static int tomoyo_write_exception_policy(struct tomoyo_io_buffer *head) +{ + char *data = head->write_buf; + bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE); + + if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_KEEP_DOMAIN)) + return tomoyo_write_domain_keeper_policy(data, false, + is_delete); + if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_KEEP_DOMAIN)) + return tomoyo_write_domain_keeper_policy(data, true, is_delete); + if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_INITIALIZE_DOMAIN)) + return tomoyo_write_domain_initializer_policy(data, false, + is_delete); + if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN)) + return tomoyo_write_domain_initializer_policy(data, true, + is_delete); + if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALIAS)) + return tomoyo_write_alias_policy(data, is_delete); + if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_READ)) + return tomoyo_write_globally_readable_policy(data, is_delete); + if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_FILE_PATTERN)) + return tomoyo_write_pattern_policy(data, is_delete); + if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DENY_REWRITE)) + return tomoyo_write_no_rewrite_policy(data, is_delete); + return -EINVAL; +} + +/** + * tomoyo_read_exception_policy - Read exception policy. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns 0 on success, -EINVAL otherwise. + */ +static int tomoyo_read_exception_policy(struct tomoyo_io_buffer *head) +{ + if (!head->read_eof) { + switch (head->read_step) { + case 0: + head->read_var2 = NULL; + head->read_step = 1; + case 1: + if (!tomoyo_read_domain_keeper_policy(head)) + break; + head->read_var2 = NULL; + head->read_step = 2; + case 2: + if (!tomoyo_read_globally_readable_policy(head)) + break; + head->read_var2 = NULL; + head->read_step = 3; + case 3: + head->read_var2 = NULL; + head->read_step = 4; + case 4: + if (!tomoyo_read_domain_initializer_policy(head)) + break; + head->read_var2 = NULL; + head->read_step = 5; + case 5: + if (!tomoyo_read_alias_policy(head)) + break; + head->read_var2 = NULL; + head->read_step = 6; + case 6: + head->read_var2 = NULL; + head->read_step = 7; + case 7: + if (!tomoyo_read_file_pattern(head)) + break; + head->read_var2 = NULL; + head->read_step = 8; + case 8: + if (!tomoyo_read_no_rewrite_policy(head)) + break; + head->read_var2 = NULL; + head->read_step = 9; + case 9: + head->read_eof = true; + break; + default: + return -EINVAL; + } + } + return 0; +} + +/* path to policy loader */ +static const char *tomoyo_loader = "/sbin/tomoyo-init"; + +/** + * tomoyo_policy_loader_exists - Check whether /sbin/tomoyo-init exists. + * + * Returns true if /sbin/tomoyo-init exists, false otherwise. + */ +static bool tomoyo_policy_loader_exists(void) +{ + /* + * Don't activate MAC if the policy loader doesn't exist. + * If the initrd includes /sbin/init but real-root-dev has not + * mounted on / yet, activating MAC will block the system since + * policies are not loaded yet. + * Thus, let do_execve() call this function everytime. + */ + struct nameidata nd; + + if (path_lookup(tomoyo_loader, LOOKUP_FOLLOW, &nd)) { + printk(KERN_INFO "Not activating Mandatory Access Control now " + "since %s doesn't exist.\n", tomoyo_loader); + return false; + } + path_put(&nd.path); + return true; +} + +/** + * tomoyo_load_policy - Run external policy loader to load policy. + * + * @filename: The program about to start. + * + * This function checks whether @filename is /sbin/init , and if so + * invoke /sbin/tomoyo-init and wait for the termination of /sbin/tomoyo-init + * and then continues invocation of /sbin/init. + * /sbin/tomoyo-init reads policy files in /etc/tomoyo/ directory and + * writes to /sys/kernel/security/tomoyo/ interfaces. + * + * Returns nothing. + */ +void tomoyo_load_policy(const char *filename) +{ + char *argv[2]; + char *envp[3]; + + if (tomoyo_policy_loaded) + return; + /* + * Check filename is /sbin/init or /sbin/tomoyo-start. + * /sbin/tomoyo-start is a dummy filename in case where /sbin/init can't + * be passed. + * You can create /sbin/tomoyo-start by + * "ln -s /bin/true /sbin/tomoyo-start". + */ + if (strcmp(filename, "/sbin/init") && + strcmp(filename, "/sbin/tomoyo-start")) + return; + if (!tomoyo_policy_loader_exists()) + return; + + printk(KERN_INFO "Calling %s to load policy. Please wait.\n", + tomoyo_loader); + argv[0] = (char *) tomoyo_loader; + argv[1] = NULL; + envp[0] = "HOME=/"; + envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; + envp[2] = NULL; + call_usermodehelper(argv[0], argv, envp, 1); + + printk(KERN_INFO "TOMOYO: 2.2.0-pre 2008/11/11\n"); + printk(KERN_INFO "Mandatory Access Control activated.\n"); + tomoyo_policy_loaded = true; + { /* Check all profiles currently assigned to domains are defined. */ + struct tomoyo_domain_info *domain; + list1_for_each_entry(domain, &tomoyo_domain_list, list) { + const u8 profile = domain->profile; + if (tomoyo_profile_ptr[profile]) + continue; + panic("Profile %u (used by '%s') not defined.\n", + profile, domain->domainname->name); + } + } +} + +/** + * tomoyo_read_version: Get version. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns version information. + */ +static int tomoyo_read_version(struct tomoyo_io_buffer *head) +{ + if (!head->read_eof) { + tomoyo_io_printf(head, "2.2.0-pre"); + head->read_eof = true; + } + return 0; +} + +/** + * tomoyo_read_self_domain - Get the current process's domainname. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns the current process's domainname. + */ +static int tomoyo_read_self_domain(struct tomoyo_io_buffer *head) +{ + if (!head->read_eof) { + /* + * tomoyo_domain()->domainname != NULL + * because every process belongs to a domain and + * the domain's name cannot be NULL. + */ + tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name); + head->read_eof = true; + } + return 0; +} + +/** + * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface. + * + * @type: Type of interface. + * @file: Pointer to "struct file". + * + * Associates policy handler and returns 0 on success, -ENOMEM otherwise. + */ +static int tomoyo_open_control(const u8 type, struct file *file) +{ + struct tomoyo_io_buffer *head = tomoyo_alloc(sizeof(*head)); + + if (!head) + return -ENOMEM; + mutex_init(&head->io_sem); + switch (type) { + case TOMOYO_DOMAINPOLICY: + /* /sys/kernel/security/tomoyo/domain_policy */ + head->write = tomoyo_write_domain_policy; + head->read = tomoyo_read_domain_policy; + break; + case TOMOYO_EXCEPTIONPOLICY: + /* /sys/kernel/security/tomoyo/exception_policy */ + head->write = tomoyo_write_exception_policy; + head->read = tomoyo_read_exception_policy; + break; + case TOMOYO_SELFDOMAIN: + /* /sys/kernel/security/tomoyo/self_domain */ + head->read = tomoyo_read_self_domain; + break; + case TOMOYO_DOMAIN_STATUS: + /* /sys/kernel/security/tomoyo/.domain_status */ + head->write = tomoyo_write_domain_profile; + head->read = tomoyo_read_domain_profile; + break; + case TOMOYO_PROCESS_STATUS: + /* /sys/kernel/security/tomoyo/.process_status */ + head->write = tomoyo_write_pid; + head->read = tomoyo_read_pid; + break; + case TOMOYO_VERSION: + /* /sys/kernel/security/tomoyo/version */ + head->read = tomoyo_read_version; + head->readbuf_size = 128; + break; + case TOMOYO_MEMINFO: + /* /sys/kernel/security/tomoyo/meminfo */ + head->write = tomoyo_write_memory_quota; + head->read = tomoyo_read_memory_counter; + head->readbuf_size = 512; + break; + case TOMOYO_PROFILE: + /* /sys/kernel/security/tomoyo/profile */ + head->write = tomoyo_write_profile; + head->read = tomoyo_read_profile; + break; + case TOMOYO_MANAGER: + /* /sys/kernel/security/tomoyo/manager */ + head->write = tomoyo_write_manager_policy; + head->read = tomoyo_read_manager_policy; + break; + } + if (!(file->f_mode & FMODE_READ)) { + /* + * No need to allocate read_buf since it is not opened + * for reading. + */ + head->read = NULL; + } else { + if (!head->readbuf_size) + head->readbuf_size = 4096 * 2; + head->read_buf = tomoyo_alloc(head->readbuf_size); + if (!head->read_buf) { + tomoyo_free(head); + return -ENOMEM; + } + } + if (!(file->f_mode & FMODE_WRITE)) { + /* + * No need to allocate write_buf since it is not opened + * for writing. + */ + head->write = NULL; + } else if (head->write) { + head->writebuf_size = 4096 * 2; + head->write_buf = tomoyo_alloc(head->writebuf_size); + if (!head->write_buf) { + tomoyo_free(head->read_buf); + tomoyo_free(head); + return -ENOMEM; + } + } + file->private_data = head; + /* + * Call the handler now if the file is + * /sys/kernel/security/tomoyo/self_domain + * so that the user can use + * cat < /sys/kernel/security/tomoyo/self_domain" + * to know the current process's domainname. + */ + if (type == TOMOYO_SELFDOMAIN) + tomoyo_read_control(file, NULL, 0); + return 0; +} + +/** + * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface. + * + * @file: Pointer to "struct file". + * @buffer: Poiner to buffer to write to. + * @buffer_len: Size of @buffer. + * + * Returns bytes read on success, negative value otherwise. + */ +static int tomoyo_read_control(struct file *file, char __user *buffer, + const int buffer_len) +{ + int len = 0; + struct tomoyo_io_buffer *head = file->private_data; + char *cp; + + if (!head->read) + return -ENOSYS; + if (mutex_lock_interruptible(&head->io_sem)) + return -EINTR; + /* Call the policy handler. */ + len = head->read(head); + if (len < 0) + goto out; + /* Write to buffer. */ + len = head->read_avail; + if (len > buffer_len) + len = buffer_len; + if (!len) + goto out; + /* head->read_buf changes by some functions. */ + cp = head->read_buf; + if (copy_to_user(buffer, cp, len)) { + len = -EFAULT; + goto out; + } + head->read_avail -= len; + memmove(cp, cp + len, head->read_avail); + out: + mutex_unlock(&head->io_sem); + return len; +} + +/** + * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface. + * + * @file: Pointer to "struct file". + * @buffer: Pointer to buffer to read from. + * @buffer_len: Size of @buffer. + * + * Returns @buffer_len on success, negative value otherwise. + */ +static int tomoyo_write_control(struct file *file, const char __user *buffer, + const int buffer_len) +{ + struct tomoyo_io_buffer *head = file->private_data; + int error = buffer_len; + int avail_len = buffer_len; + char *cp0 = head->write_buf; + + if (!head->write) + return -ENOSYS; + if (!access_ok(VERIFY_READ, buffer, buffer_len)) + return -EFAULT; + /* Don't allow updating policies by non manager programs. */ + if (head->write != tomoyo_write_pid && + head->write != tomoyo_write_domain_policy && + !tomoyo_is_policy_manager()) + return -EPERM; + if (mutex_lock_interruptible(&head->io_sem)) + return -EINTR; + /* Read a line and dispatch it to the policy handler. */ + while (avail_len > 0) { + char c; + if (head->write_avail >= head->writebuf_size - 1) { + error = -ENOMEM; + break; + } else if (get_user(c, buffer)) { + error = -EFAULT; + break; + } + buffer++; + avail_len--; + cp0[head->write_avail++] = c; + if (c != '\n') + continue; + cp0[head->write_avail - 1] = '\0'; + head->write_avail = 0; + tomoyo_normalize_line(cp0); + head->write(head); + } + mutex_unlock(&head->io_sem); + return error; +} + +/** + * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface. + * + * @file: Pointer to "struct file". + * + * Releases memory and returns 0. + */ +static int tomoyo_close_control(struct file *file) +{ + struct tomoyo_io_buffer *head = file->private_data; + + /* Release memory used for policy I/O. */ + tomoyo_free(head->read_buf); + head->read_buf = NULL; + tomoyo_free(head->write_buf); + head->write_buf = NULL; + tomoyo_free(head); + head = NULL; + file->private_data = NULL; + return 0; +} + +/** + * tomoyo_alloc_acl_element - Allocate permanent memory for ACL entry. + * + * @acl_type: Type of ACL entry. + * + * Returns pointer to the ACL entry on success, NULL otherwise. + */ +void *tomoyo_alloc_acl_element(const u8 acl_type) +{ + int len; + struct tomoyo_acl_info *ptr; + + switch (acl_type) { + case TOMOYO_TYPE_SINGLE_PATH_ACL: + len = sizeof(struct tomoyo_single_path_acl_record); + break; + case TOMOYO_TYPE_DOUBLE_PATH_ACL: + len = sizeof(struct tomoyo_double_path_acl_record); + break; + default: + return NULL; + } + ptr = tomoyo_alloc_element(len); + if (!ptr) + return NULL; + ptr->type = acl_type; + return ptr; +} + +/** + * tomoyo_open - open() for /sys/kernel/security/tomoyo/ interface. + * + * @inode: Pointer to "struct inode". + * @file: Pointer to "struct file". + * + * Returns 0 on success, negative value otherwise. + */ +static int tomoyo_open(struct inode *inode, struct file *file) +{ + const int key = ((u8 *) file->f_path.dentry->d_inode->i_private) + - ((u8 *) NULL); + return tomoyo_open_control(key, file); +} + +/** + * tomoyo_release - close() for /sys/kernel/security/tomoyo/ interface. + * + * @inode: Pointer to "struct inode". + * @file: Pointer to "struct file". + * + * Returns 0 on success, negative value otherwise. + */ +static int tomoyo_release(struct inode *inode, struct file *file) +{ + return tomoyo_close_control(file); +} + +/** + * tomoyo_read - read() for /sys/kernel/security/tomoyo/ interface. + * + * @file: Pointer to "struct file". + * @buf: Pointer to buffer. + * @count: Size of @buf. + * @ppos: Unused. + * + * Returns bytes read on success, negative value otherwise. + */ +static ssize_t tomoyo_read(struct file *file, char __user *buf, size_t count, + loff_t *ppos) +{ + return tomoyo_read_control(file, buf, count); +} + +/** + * tomoyo_write - write() for /sys/kernel/security/tomoyo/ interface. + * + * @file: Pointer to "struct file". + * @buf: Pointer to buffer. + * @count: Size of @buf. + * @ppos: Unused. + * + * Returns @count on success, negative value otherwise. + */ +static ssize_t tomoyo_write(struct file *file, const char __user *buf, + size_t count, loff_t *ppos) +{ + return tomoyo_write_control(file, buf, count); +} + +/* Operations for /sys/kernel/security/tomoyo/ interface. */ +static struct file_operations tomoyo_operations = { + .open = tomoyo_open, + .release = tomoyo_release, + .read = tomoyo_read, + .write = tomoyo_write, +}; + +/** + * tomoyo_create_entry - Create interface files under /sys/kernel/security/tomoyo/ directory. + * + * @name: The name of the interface file. + * @mode: The permission of the interface file. + * @parent: The parent directory. + * @key: Type of interface. + * + * Returns nothing. + */ +static void __init tomoyo_create_entry(const char *name, const mode_t mode, + struct dentry *parent, const u8 key) +{ + securityfs_create_file(name, mode, parent, ((u8 *) NULL) + key, + &tomoyo_operations); +} + +/** + * tomoyo_initerface_init - Initialize /sys/kernel/security/tomoyo/ interface. + * + * Returns 0. + */ +static int __init tomoyo_initerface_init(void) +{ + struct dentry *tomoyo_dir; + + tomoyo_dir = securityfs_create_dir("tomoyo", NULL); + tomoyo_create_entry("domain_policy", 0600, tomoyo_dir, + TOMOYO_DOMAINPOLICY); + tomoyo_create_entry("exception_policy", 0600, tomoyo_dir, + TOMOYO_EXCEPTIONPOLICY); + tomoyo_create_entry("self_domain", 0400, tomoyo_dir, + TOMOYO_SELFDOMAIN); + tomoyo_create_entry(".domain_status", 0600, tomoyo_dir, + TOMOYO_DOMAIN_STATUS); + tomoyo_create_entry(".process_status", 0600, tomoyo_dir, + TOMOYO_PROCESS_STATUS); + tomoyo_create_entry("meminfo", 0600, tomoyo_dir, + TOMOYO_MEMINFO); + tomoyo_create_entry("profile", 0600, tomoyo_dir, + TOMOYO_PROFILE); + tomoyo_create_entry("manager", 0600, tomoyo_dir, + TOMOYO_MANAGER); + tomoyo_create_entry("version", 0400, tomoyo_dir, + TOMOYO_VERSION); + return 0; +} + +fs_initcall(tomoyo_initerface_init); --- /dev/null +++ linux-2.6.28-rc5-mm1/security/tomoyo/common.h @@ -0,0 +1,337 @@ +/* + * security/tomoyo/common.h + * + * Common functions for TOMOYO. + * + * Copyright (C) 2005-2008 NTT DATA CORPORATION + * + * Version: 2.2.0-pre 2008/11/11 + * + */ + +#ifndef _SECURITY_TOMOYO_COMMON_H +#define _SECURITY_TOMOYO_COMMON_H + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +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 list1_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 list1_head list; + struct list1_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 . */ +#define TOMOYO_ROOT_NAME "" +#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 list1_head *read_var1; + /* Extra variables for reading. */ + struct list1_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 list1_head tomoyo_domain_list; + +/* Has /sbin/init started? */ +extern bool tomoyo_policy_loaded; + +/* The kernel's domain. */ +extern struct tomoyo_domain_info tomoyo_kernel_domain; + +#endif /* !defined(_SECURITY_TOMOYO_COMMON_H) */ -- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/