| /* |
| * security/tomoyo/file.c |
| * |
| * Pathname restriction functions. |
| * |
| * Copyright (C) 2005-2010 NTT DATA CORPORATION |
| */ |
| |
| #include "common.h" |
| #include <linux/slab.h> |
| |
| /* Keyword array for operations with one pathname. */ |
| const char *tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = { |
| [TOMOYO_TYPE_READ_WRITE] = "read/write", |
| [TOMOYO_TYPE_EXECUTE] = "execute", |
| [TOMOYO_TYPE_READ] = "read", |
| [TOMOYO_TYPE_WRITE] = "write", |
| [TOMOYO_TYPE_UNLINK] = "unlink", |
| [TOMOYO_TYPE_RMDIR] = "rmdir", |
| [TOMOYO_TYPE_TRUNCATE] = "truncate", |
| [TOMOYO_TYPE_SYMLINK] = "symlink", |
| [TOMOYO_TYPE_REWRITE] = "rewrite", |
| [TOMOYO_TYPE_CHROOT] = "chroot", |
| [TOMOYO_TYPE_UMOUNT] = "unmount", |
| }; |
| |
| /* Keyword array for operations with one pathname and three numbers. */ |
| const char *tomoyo_mkdev_keyword[TOMOYO_MAX_MKDEV_OPERATION] = { |
| [TOMOYO_TYPE_MKBLOCK] = "mkblock", |
| [TOMOYO_TYPE_MKCHAR] = "mkchar", |
| }; |
| |
| /* Keyword array for operations with two pathnames. */ |
| const char *tomoyo_path2_keyword[TOMOYO_MAX_PATH2_OPERATION] = { |
| [TOMOYO_TYPE_LINK] = "link", |
| [TOMOYO_TYPE_RENAME] = "rename", |
| [TOMOYO_TYPE_PIVOT_ROOT] = "pivot_root", |
| }; |
| |
| /* Keyword array for operations with one pathname and one number. */ |
| const char *tomoyo_path_number_keyword[TOMOYO_MAX_PATH_NUMBER_OPERATION] = { |
| [TOMOYO_TYPE_CREATE] = "create", |
| [TOMOYO_TYPE_MKDIR] = "mkdir", |
| [TOMOYO_TYPE_MKFIFO] = "mkfifo", |
| [TOMOYO_TYPE_MKSOCK] = "mksock", |
| [TOMOYO_TYPE_IOCTL] = "ioctl", |
| [TOMOYO_TYPE_CHMOD] = "chmod", |
| [TOMOYO_TYPE_CHOWN] = "chown", |
| [TOMOYO_TYPE_CHGRP] = "chgrp", |
| }; |
| |
| static const u8 tomoyo_p2mac[TOMOYO_MAX_PATH_OPERATION] = { |
| [TOMOYO_TYPE_READ_WRITE] = TOMOYO_MAC_FILE_OPEN, |
| [TOMOYO_TYPE_EXECUTE] = TOMOYO_MAC_FILE_EXECUTE, |
| [TOMOYO_TYPE_READ] = TOMOYO_MAC_FILE_OPEN, |
| [TOMOYO_TYPE_WRITE] = TOMOYO_MAC_FILE_OPEN, |
| [TOMOYO_TYPE_UNLINK] = TOMOYO_MAC_FILE_UNLINK, |
| [TOMOYO_TYPE_RMDIR] = TOMOYO_MAC_FILE_RMDIR, |
| [TOMOYO_TYPE_TRUNCATE] = TOMOYO_MAC_FILE_TRUNCATE, |
| [TOMOYO_TYPE_SYMLINK] = TOMOYO_MAC_FILE_SYMLINK, |
| [TOMOYO_TYPE_REWRITE] = TOMOYO_MAC_FILE_REWRITE, |
| [TOMOYO_TYPE_CHROOT] = TOMOYO_MAC_FILE_CHROOT, |
| [TOMOYO_TYPE_UMOUNT] = TOMOYO_MAC_FILE_UMOUNT, |
| }; |
| |
| static const u8 tomoyo_pnnn2mac[TOMOYO_MAX_MKDEV_OPERATION] = { |
| [TOMOYO_TYPE_MKBLOCK] = TOMOYO_MAC_FILE_MKBLOCK, |
| [TOMOYO_TYPE_MKCHAR] = TOMOYO_MAC_FILE_MKCHAR, |
| }; |
| |
| static const u8 tomoyo_pp2mac[TOMOYO_MAX_PATH2_OPERATION] = { |
| [TOMOYO_TYPE_LINK] = TOMOYO_MAC_FILE_LINK, |
| [TOMOYO_TYPE_RENAME] = TOMOYO_MAC_FILE_RENAME, |
| [TOMOYO_TYPE_PIVOT_ROOT] = TOMOYO_MAC_FILE_PIVOT_ROOT, |
| }; |
| |
| static const u8 tomoyo_pn2mac[TOMOYO_MAX_PATH_NUMBER_OPERATION] = { |
| [TOMOYO_TYPE_CREATE] = TOMOYO_MAC_FILE_CREATE, |
| [TOMOYO_TYPE_MKDIR] = TOMOYO_MAC_FILE_MKDIR, |
| [TOMOYO_TYPE_MKFIFO] = TOMOYO_MAC_FILE_MKFIFO, |
| [TOMOYO_TYPE_MKSOCK] = TOMOYO_MAC_FILE_MKSOCK, |
| [TOMOYO_TYPE_IOCTL] = TOMOYO_MAC_FILE_IOCTL, |
| [TOMOYO_TYPE_CHMOD] = TOMOYO_MAC_FILE_CHMOD, |
| [TOMOYO_TYPE_CHOWN] = TOMOYO_MAC_FILE_CHOWN, |
| [TOMOYO_TYPE_CHGRP] = TOMOYO_MAC_FILE_CHGRP, |
| }; |
| |
| void tomoyo_put_name_union(struct tomoyo_name_union *ptr) |
| { |
| if (!ptr) |
| return; |
| if (ptr->is_group) |
| tomoyo_put_group(ptr->group); |
| else |
| tomoyo_put_name(ptr->filename); |
| } |
| |
| bool tomoyo_compare_name_union(const struct tomoyo_path_info *name, |
| const struct tomoyo_name_union *ptr) |
| { |
| if (ptr->is_group) |
| return tomoyo_path_matches_group(name, ptr->group); |
| return tomoyo_path_matches_pattern(name, ptr->filename); |
| } |
| |
| void tomoyo_put_number_union(struct tomoyo_number_union *ptr) |
| { |
| if (ptr && ptr->is_group) |
| tomoyo_put_group(ptr->group); |
| } |
| |
| bool tomoyo_compare_number_union(const unsigned long value, |
| const struct tomoyo_number_union *ptr) |
| { |
| if (ptr->is_group) |
| return tomoyo_number_matches_group(value, value, ptr->group); |
| return value >= ptr->values[0] && value <= ptr->values[1]; |
| } |
| |
| static void tomoyo_add_slash(struct tomoyo_path_info *buf) |
| { |
| if (buf->is_dir) |
| return; |
| /* |
| * This is OK because tomoyo_encode() reserves space for appending "/". |
| */ |
| strcat((char *) buf->name, "/"); |
| tomoyo_fill_path_info(buf); |
| } |
| |
| /** |
| * tomoyo_strendswith - Check whether the token ends with the given token. |
| * |
| * @name: The token to check. |
| * @tail: The token to find. |
| * |
| * Returns true if @name ends with @tail, false otherwise. |
| */ |
| static bool tomoyo_strendswith(const char *name, const char *tail) |
| { |
| int len; |
| |
| if (!name || !tail) |
| return false; |
| len = strlen(name) - strlen(tail); |
| return len >= 0 && !strcmp(name + len, tail); |
| } |
| |
| /** |
| * tomoyo_get_realpath - Get realpath. |
| * |
| * @buf: Pointer to "struct tomoyo_path_info". |
| * @path: Pointer to "struct path". |
| * |
| * Returns true on success, false otherwise. |
| */ |
| static bool tomoyo_get_realpath(struct tomoyo_path_info *buf, struct path *path) |
| { |
| buf->name = tomoyo_realpath_from_path(path); |
| if (buf->name) { |
| tomoyo_fill_path_info(buf); |
| return true; |
| } |
| return false; |
| } |
| |
| /** |
| * tomoyo_audit_path_log - Audit path request log. |
| * |
| * @r: Pointer to "struct tomoyo_request_info". |
| * |
| * Returns 0 on success, negative value otherwise. |
| */ |
| static int tomoyo_audit_path_log(struct tomoyo_request_info *r) |
| { |
| const char *operation = tomoyo_path_keyword[r->param.path.operation]; |
| const struct tomoyo_path_info *filename = r->param.path.filename; |
| if (r->granted) |
| return 0; |
| tomoyo_warn_log(r, "%s %s", operation, filename->name); |
| return tomoyo_supervisor(r, "allow_%s %s\n", operation, |
| tomoyo_file_pattern(filename)); |
| } |
| |
| /** |
| * tomoyo_audit_path2_log - Audit path/path request log. |
| * |
| * @r: Pointer to "struct tomoyo_request_info". |
| * |
| * Returns 0 on success, negative value otherwise. |
| */ |
| static int tomoyo_audit_path2_log(struct tomoyo_request_info *r) |
| { |
| const char *operation = tomoyo_path2_keyword[r->param.path2.operation]; |
| const struct tomoyo_path_info *filename1 = r->param.path2.filename1; |
| const struct tomoyo_path_info *filename2 = r->param.path2.filename2; |
| if (r->granted) |
| return 0; |
| tomoyo_warn_log(r, "%s %s %s", operation, filename1->name, |
| filename2->name); |
| return tomoyo_supervisor(r, "allow_%s %s %s\n", operation, |
| tomoyo_file_pattern(filename1), |
| tomoyo_file_pattern(filename2)); |
| } |
| |
| /** |
| * tomoyo_audit_mkdev_log - Audit path/number/number/number request log. |
| * |
| * @r: Pointer to "struct tomoyo_request_info". |
| * |
| * Returns 0 on success, negative value otherwise. |
| */ |
| static int tomoyo_audit_mkdev_log(struct tomoyo_request_info *r) |
| { |
| const char *operation = tomoyo_mkdev_keyword[r->param.mkdev.operation]; |
| const struct tomoyo_path_info *filename = r->param.mkdev.filename; |
| const unsigned int major = r->param.mkdev.major; |
| const unsigned int minor = r->param.mkdev.minor; |
| const unsigned int mode = r->param.mkdev.mode; |
| if (r->granted) |
| return 0; |
| tomoyo_warn_log(r, "%s %s 0%o %u %u", operation, filename->name, mode, |
| major, minor); |
| return tomoyo_supervisor(r, "allow_%s %s 0%o %u %u\n", operation, |
| tomoyo_file_pattern(filename), mode, major, |
| minor); |
| } |
| |
| /** |
| * tomoyo_audit_path_number_log - Audit path/number request log. |
| * |
| * @r: Pointer to "struct tomoyo_request_info". |
| * @error: Error code. |
| * |
| * Returns 0 on success, negative value otherwise. |
| */ |
| static int tomoyo_audit_path_number_log(struct tomoyo_request_info *r) |
| { |
| const u8 type = r->param.path_number.operation; |
| u8 radix; |
| const struct tomoyo_path_info *filename = r->param.path_number.filename; |
| const char *operation = tomoyo_path_number_keyword[type]; |
| char buffer[64]; |
| if (r->granted) |
| return 0; |
| switch (type) { |
| case TOMOYO_TYPE_CREATE: |
| case TOMOYO_TYPE_MKDIR: |
| case TOMOYO_TYPE_MKFIFO: |
| case TOMOYO_TYPE_MKSOCK: |
| case TOMOYO_TYPE_CHMOD: |
| radix = TOMOYO_VALUE_TYPE_OCTAL; |
| break; |
| case TOMOYO_TYPE_IOCTL: |
| radix = TOMOYO_VALUE_TYPE_HEXADECIMAL; |
| break; |
| default: |
| radix = TOMOYO_VALUE_TYPE_DECIMAL; |
| break; |
| } |
| tomoyo_print_ulong(buffer, sizeof(buffer), r->param.path_number.number, |
| radix); |
| tomoyo_warn_log(r, "%s %s %s", operation, filename->name, buffer); |
| return tomoyo_supervisor(r, "allow_%s %s %s\n", operation, |
| tomoyo_file_pattern(filename), buffer); |
| } |
| |
| static bool tomoyo_same_globally_readable(const struct tomoyo_acl_head *a, |
| const struct tomoyo_acl_head *b) |
| { |
| return container_of(a, struct tomoyo_globally_readable_file_entry, |
| head)->filename == |
| container_of(b, struct tomoyo_globally_readable_file_entry, |
| head)->filename; |
| } |
| |
| /** |
| * tomoyo_update_globally_readable_entry - Update "struct tomoyo_globally_readable_file_entry" list. |
| * |
| * @filename: Filename unconditionally permitted to open() for reading. |
| * @is_delete: True if it is a delete request. |
| * |
| * Returns 0 on success, negative value otherwise. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| static int tomoyo_update_globally_readable_entry(const char *filename, |
| const bool is_delete) |
| { |
| struct tomoyo_globally_readable_file_entry e = { }; |
| int error; |
| |
| if (!tomoyo_correct_word(filename)) |
| return -EINVAL; |
| e.filename = tomoyo_get_name(filename); |
| if (!e.filename) |
| return -ENOMEM; |
| error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, |
| &tomoyo_policy_list |
| [TOMOYO_ID_GLOBALLY_READABLE], |
| tomoyo_same_globally_readable); |
| tomoyo_put_name(e.filename); |
| return error; |
| } |
| |
| /** |
| * tomoyo_globally_readable_file - Check if the file is unconditionnaly permitted to be open()ed for reading. |
| * |
| * @filename: The filename to check. |
| * |
| * Returns true if any domain can open @filename for reading, false otherwise. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| static bool tomoyo_globally_readable_file(const struct tomoyo_path_info * |
| filename) |
| { |
| struct tomoyo_globally_readable_file_entry *ptr; |
| bool found = false; |
| |
| list_for_each_entry_rcu(ptr, &tomoyo_policy_list |
| [TOMOYO_ID_GLOBALLY_READABLE], head.list) { |
| if (!ptr->head.is_deleted && |
| tomoyo_path_matches_pattern(filename, ptr->filename)) { |
| found = true; |
| break; |
| } |
| } |
| return found; |
| } |
| |
| /** |
| * tomoyo_write_globally_readable_policy - Write "struct tomoyo_globally_readable_file_entry" list. |
| * |
| * @data: String to parse. |
| * @is_delete: True if it is a delete request. |
| * |
| * Returns 0 on success, negative value otherwise. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| int tomoyo_write_globally_readable_policy(char *data, const bool is_delete) |
| { |
| return tomoyo_update_globally_readable_entry(data, is_delete); |
| } |
| |
| static bool tomoyo_same_pattern(const struct tomoyo_acl_head *a, |
| const struct tomoyo_acl_head *b) |
| { |
| return container_of(a, struct tomoyo_pattern_entry, head)->pattern == |
| container_of(b, struct tomoyo_pattern_entry, head)->pattern; |
| } |
| |
| /** |
| * tomoyo_update_file_pattern_entry - Update "struct tomoyo_pattern_entry" list. |
| * |
| * @pattern: Pathname pattern. |
| * @is_delete: True if it is a delete request. |
| * |
| * Returns 0 on success, negative value otherwise. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| static int tomoyo_update_file_pattern_entry(const char *pattern, |
| const bool is_delete) |
| { |
| struct tomoyo_pattern_entry e = { }; |
| int error; |
| |
| if (!tomoyo_correct_word(pattern)) |
| return -EINVAL; |
| e.pattern = tomoyo_get_name(pattern); |
| if (!e.pattern) |
| return -ENOMEM; |
| error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, |
| &tomoyo_policy_list[TOMOYO_ID_PATTERN], |
| tomoyo_same_pattern); |
| tomoyo_put_name(e.pattern); |
| return error; |
| } |
| |
| /** |
| * tomoyo_file_pattern - Get patterned pathname. |
| * |
| * @filename: The filename to find patterned pathname. |
| * |
| * Returns pointer to pathname pattern if matched, @filename otherwise. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| const char *tomoyo_file_pattern(const struct tomoyo_path_info *filename) |
| { |
| struct tomoyo_pattern_entry *ptr; |
| const struct tomoyo_path_info *pattern = NULL; |
| |
| list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_PATTERN], |
| head.list) { |
| if (ptr->head.is_deleted) |
| continue; |
| if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) |
| continue; |
| pattern = ptr->pattern; |
| if (tomoyo_strendswith(pattern->name, "/\\*")) { |
| /* Do nothing. Try to find the better match. */ |
| } else { |
| /* This would be the better match. Use this. */ |
| break; |
| } |
| } |
| if (pattern) |
| filename = pattern; |
| return filename->name; |
| } |
| |
| /** |
| * tomoyo_write_pattern_policy - Write "struct tomoyo_pattern_entry" list. |
| * |
| * @data: String to parse. |
| * @is_delete: True if it is a delete request. |
| * |
| * Returns 0 on success, negative value otherwise. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| int tomoyo_write_pattern_policy(char *data, const bool is_delete) |
| { |
| return tomoyo_update_file_pattern_entry(data, is_delete); |
| } |
| |
| static bool tomoyo_same_no_rewrite(const struct tomoyo_acl_head *a, |
| const struct tomoyo_acl_head *b) |
| { |
| return container_of(a, struct tomoyo_no_rewrite_entry, head)->pattern |
| == container_of(b, struct tomoyo_no_rewrite_entry, head) |
| ->pattern; |
| } |
| |
| /** |
| * tomoyo_update_no_rewrite_entry - Update "struct tomoyo_no_rewrite_entry" list. |
| * |
| * @pattern: Pathname pattern that are not rewritable by default. |
| * @is_delete: True if it is a delete request. |
| * |
| * Returns 0 on success, negative value otherwise. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| static int tomoyo_update_no_rewrite_entry(const char *pattern, |
| const bool is_delete) |
| { |
| struct tomoyo_no_rewrite_entry e = { }; |
| int error; |
| |
| if (!tomoyo_correct_word(pattern)) |
| return -EINVAL; |
| e.pattern = tomoyo_get_name(pattern); |
| if (!e.pattern) |
| return -ENOMEM; |
| error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, |
| &tomoyo_policy_list[TOMOYO_ID_NO_REWRITE], |
| tomoyo_same_no_rewrite); |
| tomoyo_put_name(e.pattern); |
| return error; |
| } |
| |
| /** |
| * tomoyo_no_rewrite_file - Check if the given pathname is not permitted to be rewrited. |
| * |
| * @filename: Filename to check. |
| * |
| * Returns true if @filename is specified by "deny_rewrite" directive, |
| * false otherwise. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| static bool tomoyo_no_rewrite_file(const struct tomoyo_path_info *filename) |
| { |
| struct tomoyo_no_rewrite_entry *ptr; |
| bool found = false; |
| |
| list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_NO_REWRITE], |
| head.list) { |
| if (ptr->head.is_deleted) |
| continue; |
| if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) |
| continue; |
| found = true; |
| break; |
| } |
| return found; |
| } |
| |
| /** |
| * tomoyo_write_no_rewrite_policy - Write "struct tomoyo_no_rewrite_entry" list. |
| * |
| * @data: String to parse. |
| * @is_delete: True if it is a delete request. |
| * |
| * Returns 0 on success, negative value otherwise. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete) |
| { |
| return tomoyo_update_no_rewrite_entry(data, is_delete); |
| } |
| |
| static bool tomoyo_check_path_acl(const struct tomoyo_request_info *r, |
| const struct tomoyo_acl_info *ptr) |
| { |
| const struct tomoyo_path_acl *acl = container_of(ptr, typeof(*acl), |
| head); |
| return (acl->perm & (1 << r->param.path.operation)) && |
| tomoyo_compare_name_union(r->param.path.filename, &acl->name); |
| } |
| |
| static bool tomoyo_check_path_number_acl(const struct tomoyo_request_info *r, |
| const struct tomoyo_acl_info *ptr) |
| { |
| const struct tomoyo_path_number_acl *acl = |
| container_of(ptr, typeof(*acl), head); |
| return (acl->perm & (1 << r->param.path_number.operation)) && |
| tomoyo_compare_number_union(r->param.path_number.number, |
| &acl->number) && |
| tomoyo_compare_name_union(r->param.path_number.filename, |
| &acl->name); |
| } |
| |
| static bool tomoyo_check_path2_acl(const struct tomoyo_request_info *r, |
| const struct tomoyo_acl_info *ptr) |
| { |
| const struct tomoyo_path2_acl *acl = |
| container_of(ptr, typeof(*acl), head); |
| return (acl->perm & (1 << r->param.path2.operation)) && |
| tomoyo_compare_name_union(r->param.path2.filename1, &acl->name1) |
| && tomoyo_compare_name_union(r->param.path2.filename2, |
| &acl->name2); |
| } |
| |
| static bool tomoyo_check_mkdev_acl(const struct tomoyo_request_info *r, |
| const struct tomoyo_acl_info *ptr) |
| { |
| const struct tomoyo_mkdev_acl *acl = |
| container_of(ptr, typeof(*acl), head); |
| return (acl->perm & (1 << r->param.mkdev.operation)) && |
| tomoyo_compare_number_union(r->param.mkdev.mode, |
| &acl->mode) && |
| tomoyo_compare_number_union(r->param.mkdev.major, |
| &acl->major) && |
| tomoyo_compare_number_union(r->param.mkdev.minor, |
| &acl->minor) && |
| tomoyo_compare_name_union(r->param.mkdev.filename, |
| &acl->name); |
| } |
| |
| static bool tomoyo_same_path_acl(const struct tomoyo_acl_info *a, |
| const struct tomoyo_acl_info *b) |
| { |
| const struct tomoyo_path_acl *p1 = container_of(a, typeof(*p1), head); |
| const struct tomoyo_path_acl *p2 = container_of(b, typeof(*p2), head); |
| return tomoyo_same_acl_head(&p1->head, &p2->head) && |
| tomoyo_same_name_union(&p1->name, &p2->name); |
| } |
| |
| static bool tomoyo_merge_path_acl(struct tomoyo_acl_info *a, |
| struct tomoyo_acl_info *b, |
| const bool is_delete) |
| { |
| u16 * const a_perm = &container_of(a, struct tomoyo_path_acl, head) |
| ->perm; |
| u16 perm = *a_perm; |
| const u16 b_perm = container_of(b, struct tomoyo_path_acl, head)->perm; |
| if (is_delete) { |
| perm &= ~b_perm; |
| if ((perm & TOMOYO_RW_MASK) != TOMOYO_RW_MASK) |
| perm &= ~(1 << TOMOYO_TYPE_READ_WRITE); |
| else if (!(perm & (1 << TOMOYO_TYPE_READ_WRITE))) |
| perm &= ~TOMOYO_RW_MASK; |
| } else { |
| perm |= b_perm; |
| if ((perm & TOMOYO_RW_MASK) == TOMOYO_RW_MASK) |
| perm |= (1 << TOMOYO_TYPE_READ_WRITE); |
| else if (perm & (1 << TOMOYO_TYPE_READ_WRITE)) |
| perm |= TOMOYO_RW_MASK; |
| } |
| *a_perm = perm; |
| return !perm; |
| } |
| |
| /** |
| * tomoyo_update_path_acl - Update "struct tomoyo_path_acl" list. |
| * |
| * @type: Type of operation. |
| * @filename: Filename. |
| * @domain: Pointer to "struct tomoyo_domain_info". |
| * @is_delete: True if it is a delete request. |
| * |
| * Returns 0 on success, negative value otherwise. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| static int tomoyo_update_path_acl(const u8 type, const char *filename, |
| struct tomoyo_domain_info * const domain, |
| const bool is_delete) |
| { |
| struct tomoyo_path_acl e = { |
| .head.type = TOMOYO_TYPE_PATH_ACL, |
| .perm = 1 << type |
| }; |
| int error; |
| if (e.perm == (1 << TOMOYO_TYPE_READ_WRITE)) |
| e.perm |= TOMOYO_RW_MASK; |
| if (!tomoyo_parse_name_union(filename, &e.name)) |
| return -EINVAL; |
| error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
| tomoyo_same_path_acl, |
| tomoyo_merge_path_acl); |
| tomoyo_put_name_union(&e.name); |
| return error; |
| } |
| |
| static bool tomoyo_same_mkdev_acl(const struct tomoyo_acl_info *a, |
| const struct tomoyo_acl_info *b) |
| { |
| const struct tomoyo_mkdev_acl *p1 = container_of(a, typeof(*p1), |
| head); |
| const struct tomoyo_mkdev_acl *p2 = container_of(b, typeof(*p2), |
| head); |
| return tomoyo_same_acl_head(&p1->head, &p2->head) |
| && tomoyo_same_name_union(&p1->name, &p2->name) |
| && tomoyo_same_number_union(&p1->mode, &p2->mode) |
| && tomoyo_same_number_union(&p1->major, &p2->major) |
| && tomoyo_same_number_union(&p1->minor, &p2->minor); |
| } |
| |
| static bool tomoyo_merge_mkdev_acl(struct tomoyo_acl_info *a, |
| struct tomoyo_acl_info *b, |
| const bool is_delete) |
| { |
| u8 *const a_perm = &container_of(a, struct tomoyo_mkdev_acl, |
| head)->perm; |
| u8 perm = *a_perm; |
| const u8 b_perm = container_of(b, struct tomoyo_mkdev_acl, head) |
| ->perm; |
| if (is_delete) |
| perm &= ~b_perm; |
| else |
| perm |= b_perm; |
| *a_perm = perm; |
| return !perm; |
| } |
| |
| /** |
| * tomoyo_update_mkdev_acl - Update "struct tomoyo_mkdev_acl" list. |
| * |
| * @type: Type of operation. |
| * @filename: Filename. |
| * @mode: Create mode. |
| * @major: Device major number. |
| * @minor: Device minor number. |
| * @domain: Pointer to "struct tomoyo_domain_info". |
| * @is_delete: True if it is a delete request. |
| * |
| * Returns 0 on success, negative value otherwise. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| static int tomoyo_update_mkdev_acl(const u8 type, const char *filename, |
| char *mode, char *major, char *minor, |
| struct tomoyo_domain_info * const |
| domain, const bool is_delete) |
| { |
| struct tomoyo_mkdev_acl e = { |
| .head.type = TOMOYO_TYPE_MKDEV_ACL, |
| .perm = 1 << type |
| }; |
| int error = is_delete ? -ENOENT : -ENOMEM; |
| if (!tomoyo_parse_name_union(filename, &e.name) || |
| !tomoyo_parse_number_union(mode, &e.mode) || |
| !tomoyo_parse_number_union(major, &e.major) || |
| !tomoyo_parse_number_union(minor, &e.minor)) |
| goto out; |
| error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
| tomoyo_same_mkdev_acl, |
| tomoyo_merge_mkdev_acl); |
| out: |
| tomoyo_put_name_union(&e.name); |
| tomoyo_put_number_union(&e.mode); |
| tomoyo_put_number_union(&e.major); |
| tomoyo_put_number_union(&e.minor); |
| return error; |
| } |
| |
| static bool tomoyo_same_path2_acl(const struct tomoyo_acl_info *a, |
| const struct tomoyo_acl_info *b) |
| { |
| const struct tomoyo_path2_acl *p1 = container_of(a, typeof(*p1), head); |
| const struct tomoyo_path2_acl *p2 = container_of(b, typeof(*p2), head); |
| return tomoyo_same_acl_head(&p1->head, &p2->head) |
| && tomoyo_same_name_union(&p1->name1, &p2->name1) |
| && tomoyo_same_name_union(&p1->name2, &p2->name2); |
| } |
| |
| static bool tomoyo_merge_path2_acl(struct tomoyo_acl_info *a, |
| struct tomoyo_acl_info *b, |
| const bool is_delete) |
| { |
| u8 * const a_perm = &container_of(a, struct tomoyo_path2_acl, head) |
| ->perm; |
| u8 perm = *a_perm; |
| const u8 b_perm = container_of(b, struct tomoyo_path2_acl, head)->perm; |
| if (is_delete) |
| perm &= ~b_perm; |
| else |
| perm |= b_perm; |
| *a_perm = perm; |
| return !perm; |
| } |
| |
| /** |
| * tomoyo_update_path2_acl - Update "struct tomoyo_path2_acl" list. |
| * |
| * @type: Type of operation. |
| * @filename1: First filename. |
| * @filename2: Second filename. |
| * @domain: Pointer to "struct tomoyo_domain_info". |
| * @is_delete: True if it is a delete request. |
| * |
| * Returns 0 on success, negative value otherwise. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| static int tomoyo_update_path2_acl(const u8 type, const char *filename1, |
| const char *filename2, |
| struct tomoyo_domain_info * const domain, |
| const bool is_delete) |
| { |
| struct tomoyo_path2_acl e = { |
| .head.type = TOMOYO_TYPE_PATH2_ACL, |
| .perm = 1 << type |
| }; |
| int error = is_delete ? -ENOENT : -ENOMEM; |
| if (!tomoyo_parse_name_union(filename1, &e.name1) || |
| !tomoyo_parse_name_union(filename2, &e.name2)) |
| goto out; |
| error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
| tomoyo_same_path2_acl, |
| tomoyo_merge_path2_acl); |
| out: |
| tomoyo_put_name_union(&e.name1); |
| tomoyo_put_name_union(&e.name2); |
| return error; |
| } |
| |
| /** |
| * tomoyo_path_permission - Check permission for single path operation. |
| * |
| * @r: Pointer to "struct tomoyo_request_info". |
| * @operation: Type of operation. |
| * @filename: Filename to check. |
| * |
| * Returns 0 on success, negative value otherwise. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation, |
| const struct tomoyo_path_info *filename) |
| { |
| int error; |
| |
| next: |
| r->type = tomoyo_p2mac[operation]; |
| r->mode = tomoyo_get_mode(r->profile, r->type); |
| if (r->mode == TOMOYO_CONFIG_DISABLED) |
| return 0; |
| r->param_type = TOMOYO_TYPE_PATH_ACL; |
| r->param.path.filename = filename; |
| r->param.path.operation = operation; |
| do { |
| tomoyo_check_acl(r, tomoyo_check_path_acl); |
| if (!r->granted && operation == TOMOYO_TYPE_READ && |
| !r->domain->ignore_global_allow_read && |
| tomoyo_globally_readable_file(filename)) |
| r->granted = true; |
| error = tomoyo_audit_path_log(r); |
| /* |
| * Do not retry for execute request, for alias may have |
| * changed. |
| */ |
| } while (error == TOMOYO_RETRY_REQUEST && |
| operation != TOMOYO_TYPE_EXECUTE); |
| /* |
| * Since "allow_truncate" doesn't imply "allow_rewrite" permission, |
| * we need to check "allow_rewrite" permission if the filename is |
| * specified by "deny_rewrite" keyword. |
| */ |
| if (!error && operation == TOMOYO_TYPE_TRUNCATE && |
| tomoyo_no_rewrite_file(filename)) { |
| operation = TOMOYO_TYPE_REWRITE; |
| goto next; |
| } |
| return error; |
| } |
| |
| static bool tomoyo_same_path_number_acl(const struct tomoyo_acl_info *a, |
| const struct tomoyo_acl_info *b) |
| { |
| const struct tomoyo_path_number_acl *p1 = container_of(a, typeof(*p1), |
| head); |
| const struct tomoyo_path_number_acl *p2 = container_of(b, typeof(*p2), |
| head); |
| return tomoyo_same_acl_head(&p1->head, &p2->head) |
| && tomoyo_same_name_union(&p1->name, &p2->name) |
| && tomoyo_same_number_union(&p1->number, &p2->number); |
| } |
| |
| static bool tomoyo_merge_path_number_acl(struct tomoyo_acl_info *a, |
| struct tomoyo_acl_info *b, |
| const bool is_delete) |
| { |
| u8 * const a_perm = &container_of(a, struct tomoyo_path_number_acl, |
| head)->perm; |
| u8 perm = *a_perm; |
| const u8 b_perm = container_of(b, struct tomoyo_path_number_acl, head) |
| ->perm; |
| if (is_delete) |
| perm &= ~b_perm; |
| else |
| perm |= b_perm; |
| *a_perm = perm; |
| return !perm; |
| } |
| |
| /** |
| * tomoyo_update_path_number_acl - Update ioctl/chmod/chown/chgrp ACL. |
| * |
| * @type: Type of operation. |
| * @filename: Filename. |
| * @number: Number. |
| * @domain: Pointer to "struct tomoyo_domain_info". |
| * @is_delete: True if it is a delete request. |
| * |
| * Returns 0 on success, negative value otherwise. |
| */ |
| static int tomoyo_update_path_number_acl(const u8 type, const char *filename, |
| char *number, |
| struct tomoyo_domain_info * const |
| domain, |
| const bool is_delete) |
| { |
| struct tomoyo_path_number_acl e = { |
| .head.type = TOMOYO_TYPE_PATH_NUMBER_ACL, |
| .perm = 1 << type |
| }; |
| int error = is_delete ? -ENOENT : -ENOMEM; |
| if (!tomoyo_parse_name_union(filename, &e.name)) |
| return -EINVAL; |
| if (!tomoyo_parse_number_union(number, &e.number)) |
| goto out; |
| error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
| tomoyo_same_path_number_acl, |
| tomoyo_merge_path_number_acl); |
| out: |
| tomoyo_put_name_union(&e.name); |
| tomoyo_put_number_union(&e.number); |
| return error; |
| } |
| |
| /** |
| * tomoyo_path_number_perm - Check permission for "create", "mkdir", "mkfifo", "mksock", "ioctl", "chmod", "chown", "chgrp". |
| * |
| * @type: Type of operation. |
| * @path: Pointer to "struct path". |
| * @number: Number. |
| * |
| * Returns 0 on success, negative value otherwise. |
| */ |
| int tomoyo_path_number_perm(const u8 type, struct path *path, |
| unsigned long number) |
| { |
| struct tomoyo_request_info r; |
| int error = -ENOMEM; |
| struct tomoyo_path_info buf; |
| int idx; |
| |
| if (tomoyo_init_request_info(&r, NULL, tomoyo_pn2mac[type]) |
| == TOMOYO_CONFIG_DISABLED || !path->mnt || !path->dentry) |
| return 0; |
| idx = tomoyo_read_lock(); |
| if (!tomoyo_get_realpath(&buf, path)) |
| goto out; |
| if (type == TOMOYO_TYPE_MKDIR) |
| tomoyo_add_slash(&buf); |
| r.param_type = TOMOYO_TYPE_PATH_NUMBER_ACL; |
| r.param.path_number.operation = type; |
| r.param.path_number.filename = &buf; |
| r.param.path_number.number = number; |
| do { |
| tomoyo_check_acl(&r, tomoyo_check_path_number_acl); |
| error = tomoyo_audit_path_number_log(&r); |
| } while (error == TOMOYO_RETRY_REQUEST); |
| kfree(buf.name); |
| out: |
| tomoyo_read_unlock(idx); |
| if (r.mode != TOMOYO_CONFIG_ENFORCING) |
| error = 0; |
| return error; |
| } |
| |
| /** |
| * tomoyo_check_open_permission - Check permission for "read" and "write". |
| * |
| * @domain: Pointer to "struct tomoyo_domain_info". |
| * @path: Pointer to "struct path". |
| * @flag: Flags for open(). |
| * |
| * Returns 0 on success, negative value otherwise. |
| */ |
| int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, |
| struct path *path, const int flag) |
| { |
| const u8 acc_mode = ACC_MODE(flag); |
| int error = -ENOMEM; |
| struct tomoyo_path_info buf; |
| struct tomoyo_request_info r; |
| int idx; |
| |
| if (!path->mnt || |
| (path->dentry->d_inode && S_ISDIR(path->dentry->d_inode->i_mode))) |
| return 0; |
| buf.name = NULL; |
| r.mode = TOMOYO_CONFIG_DISABLED; |
| idx = tomoyo_read_lock(); |
| if (!tomoyo_get_realpath(&buf, path)) |
| goto out; |
| error = 0; |
| /* |
| * If the filename is specified by "deny_rewrite" keyword, |
| * we need to check "allow_rewrite" permission when the filename is not |
| * opened for append mode or the filename is truncated at open time. |
| */ |
| if ((acc_mode & MAY_WRITE) && !(flag & O_APPEND) |
| && tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_REWRITE) |
| != TOMOYO_CONFIG_DISABLED) { |
| if (!tomoyo_get_realpath(&buf, path)) { |
| error = -ENOMEM; |
| goto out; |
| } |
| if (tomoyo_no_rewrite_file(&buf)) |
| error = tomoyo_path_permission(&r, TOMOYO_TYPE_REWRITE, |
| &buf); |
| } |
| if (!error && acc_mode && |
| tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_OPEN) |
| != TOMOYO_CONFIG_DISABLED) { |
| u8 operation; |
| if (!buf.name && !tomoyo_get_realpath(&buf, path)) { |
| error = -ENOMEM; |
| goto out; |
| } |
| if (acc_mode == (MAY_READ | MAY_WRITE)) |
| operation = TOMOYO_TYPE_READ_WRITE; |
| else if (acc_mode == MAY_READ) |
| operation = TOMOYO_TYPE_READ; |
| else |
| operation = TOMOYO_TYPE_WRITE; |
| error = tomoyo_path_permission(&r, operation, &buf); |
| } |
| out: |
| kfree(buf.name); |
| tomoyo_read_unlock(idx); |
| if (r.mode != TOMOYO_CONFIG_ENFORCING) |
| error = 0; |
| return error; |
| } |
| |
| /** |
| * tomoyo_path_perm - Check permission for "unlink", "rmdir", "truncate", "symlink", "rewrite", "chroot" and "unmount". |
| * |
| * @operation: Type of operation. |
| * @path: Pointer to "struct path". |
| * |
| * Returns 0 on success, negative value otherwise. |
| */ |
| int tomoyo_path_perm(const u8 operation, struct path *path) |
| { |
| int error = -ENOMEM; |
| struct tomoyo_path_info buf; |
| struct tomoyo_request_info r; |
| int idx; |
| |
| if (!path->mnt) |
| return 0; |
| if (tomoyo_init_request_info(&r, NULL, tomoyo_p2mac[operation]) |
| == TOMOYO_CONFIG_DISABLED) |
| return 0; |
| buf.name = NULL; |
| idx = tomoyo_read_lock(); |
| if (!tomoyo_get_realpath(&buf, path)) |
| goto out; |
| switch (operation) { |
| case TOMOYO_TYPE_REWRITE: |
| if (!tomoyo_no_rewrite_file(&buf)) { |
| error = 0; |
| goto out; |
| } |
| break; |
| case TOMOYO_TYPE_RMDIR: |
| case TOMOYO_TYPE_CHROOT: |
| case TOMOYO_TYPE_UMOUNT: |
| tomoyo_add_slash(&buf); |
| break; |
| } |
| error = tomoyo_path_permission(&r, operation, &buf); |
| out: |
| kfree(buf.name); |
| tomoyo_read_unlock(idx); |
| if (r.mode != TOMOYO_CONFIG_ENFORCING) |
| error = 0; |
| return error; |
| } |
| |
| /** |
| * tomoyo_mkdev_perm - Check permission for "mkblock" and "mkchar". |
| * |
| * @operation: Type of operation. (TOMOYO_TYPE_MKCHAR or TOMOYO_TYPE_MKBLOCK) |
| * @path: Pointer to "struct path". |
| * @mode: Create mode. |
| * @dev: Device number. |
| * |
| * Returns 0 on success, negative value otherwise. |
| */ |
| int tomoyo_mkdev_perm(const u8 operation, struct path *path, |
| const unsigned int mode, unsigned int dev) |
| { |
| struct tomoyo_request_info r; |
| int error = -ENOMEM; |
| struct tomoyo_path_info buf; |
| int idx; |
| |
| if (!path->mnt || |
| tomoyo_init_request_info(&r, NULL, tomoyo_pnnn2mac[operation]) |
| == TOMOYO_CONFIG_DISABLED) |
| return 0; |
| idx = tomoyo_read_lock(); |
| error = -ENOMEM; |
| if (tomoyo_get_realpath(&buf, path)) { |
| dev = new_decode_dev(dev); |
| r.param_type = TOMOYO_TYPE_MKDEV_ACL; |
| r.param.mkdev.filename = &buf; |
| r.param.mkdev.operation = operation; |
| r.param.mkdev.mode = mode; |
| r.param.mkdev.major = MAJOR(dev); |
| r.param.mkdev.minor = MINOR(dev); |
| tomoyo_check_acl(&r, tomoyo_check_mkdev_acl); |
| error = tomoyo_audit_mkdev_log(&r); |
| kfree(buf.name); |
| } |
| tomoyo_read_unlock(idx); |
| if (r.mode != TOMOYO_CONFIG_ENFORCING) |
| error = 0; |
| return error; |
| } |
| |
| /** |
| * tomoyo_path2_perm - Check permission for "rename", "link" and "pivot_root". |
| * |
| * @operation: Type of operation. |
| * @path1: Pointer to "struct path". |
| * @path2: Pointer to "struct path". |
| * |
| * Returns 0 on success, negative value otherwise. |
| */ |
| int tomoyo_path2_perm(const u8 operation, struct path *path1, |
| struct path *path2) |
| { |
| int error = -ENOMEM; |
| struct tomoyo_path_info buf1; |
| struct tomoyo_path_info buf2; |
| struct tomoyo_request_info r; |
| int idx; |
| |
| if (!path1->mnt || !path2->mnt || |
| tomoyo_init_request_info(&r, NULL, tomoyo_pp2mac[operation]) |
| == TOMOYO_CONFIG_DISABLED) |
| return 0; |
| buf1.name = NULL; |
| buf2.name = NULL; |
| idx = tomoyo_read_lock(); |
| if (!tomoyo_get_realpath(&buf1, path1) || |
| !tomoyo_get_realpath(&buf2, path2)) |
| goto out; |
| switch (operation) { |
| struct dentry *dentry; |
| case TOMOYO_TYPE_RENAME: |
| case TOMOYO_TYPE_LINK: |
| dentry = path1->dentry; |
| if (!dentry->d_inode || !S_ISDIR(dentry->d_inode->i_mode)) |
| break; |
| /* fall through */ |
| case TOMOYO_TYPE_PIVOT_ROOT: |
| tomoyo_add_slash(&buf1); |
| tomoyo_add_slash(&buf2); |
| break; |
| } |
| r.param_type = TOMOYO_TYPE_PATH2_ACL; |
| r.param.path2.operation = operation; |
| r.param.path2.filename1 = &buf1; |
| r.param.path2.filename2 = &buf2; |
| do { |
| tomoyo_check_acl(&r, tomoyo_check_path2_acl); |
| error = tomoyo_audit_path2_log(&r); |
| } while (error == TOMOYO_RETRY_REQUEST); |
| out: |
| kfree(buf1.name); |
| kfree(buf2.name); |
| tomoyo_read_unlock(idx); |
| if (r.mode != TOMOYO_CONFIG_ENFORCING) |
| error = 0; |
| return error; |
| } |
| |
| /** |
| * tomoyo_write_file_policy - Update file related list. |
| * |
| * @data: String to parse. |
| * @domain: Pointer to "struct tomoyo_domain_info". |
| * @is_delete: True if it is a delete request. |
| * |
| * Returns 0 on success, negative value otherwise. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain, |
| const bool is_delete) |
| { |
| char *w[5]; |
| u8 type; |
| if (!tomoyo_tokenize(data, w, sizeof(w)) || !w[1][0]) |
| return -EINVAL; |
| if (strncmp(w[0], "allow_", 6)) |
| goto out; |
| w[0] += 6; |
| for (type = 0; type < TOMOYO_MAX_PATH_OPERATION; type++) { |
| if (strcmp(w[0], tomoyo_path_keyword[type])) |
| continue; |
| return tomoyo_update_path_acl(type, w[1], domain, is_delete); |
| } |
| if (!w[2][0]) |
| goto out; |
| for (type = 0; type < TOMOYO_MAX_PATH2_OPERATION; type++) { |
| if (strcmp(w[0], tomoyo_path2_keyword[type])) |
| continue; |
| return tomoyo_update_path2_acl(type, w[1], w[2], domain, |
| is_delete); |
| } |
| for (type = 0; type < TOMOYO_MAX_PATH_NUMBER_OPERATION; type++) { |
| if (strcmp(w[0], tomoyo_path_number_keyword[type])) |
| continue; |
| return tomoyo_update_path_number_acl(type, w[1], w[2], domain, |
| is_delete); |
| } |
| if (!w[3][0] || !w[4][0]) |
| goto out; |
| for (type = 0; type < TOMOYO_MAX_MKDEV_OPERATION; type++) { |
| if (strcmp(w[0], tomoyo_mkdev_keyword[type])) |
| continue; |
| return tomoyo_update_mkdev_acl(type, w[1], w[2], w[3], |
| w[4], domain, is_delete); |
| } |
| out: |
| return -EINVAL; |
| } |