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This project was very inspired by the comic "Card Captor SAKURA", |
This project was very inspired by the comic "Card Captor SAKURA", |
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one of the CLAMP's masterworks. |
one of the CLAMP's masterworks. |
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The names SAKURA and TOMOYO and SYAORAN were borrowed from the comic |
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with the heartfelt thanks to CLAMP. |
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ChangeLog: |
ChangeLog: |
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| 1907 |
and ccs_update_mount_acl() and ccs_check_supervisor(). This may cause |
and ccs_update_mount_acl() and ccs_check_supervisor(). This may cause |
| 1908 |
/proc/ccs/system_policy and /proc/ccs/query to contain invalid |
/proc/ccs/system_policy and /proc/ccs/query to contain invalid |
| 1909 |
characters within a string. |
characters within a string. |
| 1910 |
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| 1911 |
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Fix 2009/04/07 |
| 1912 |
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| 1913 |
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@ Fix IPv4's "address_group" handling error. |
| 1914 |
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| 1915 |
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Since 1.6.5 , due to lack of ntohl() (byte order conversion) in |
| 1916 |
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ccs_update_address_group_entry(), "address_group" with IPv4 address was |
| 1917 |
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not working. |
| 1918 |
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| 1919 |
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This problem happens on little endian platforms (e.g. x86). |
| 1920 |
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| 1921 |
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Fix 2009/05/08 |
| 1922 |
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| 1923 |
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@ Add condition for symlink's target pathname. |
| 1924 |
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| 1925 |
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Until now, "allow_symlink" keyword allows creation of a symlink but does |
| 1926 |
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not check the symlink's target. Usually it is no problem because |
| 1927 |
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permission checks are done using dereferenced pathname. But in some |
| 1928 |
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cases, we should restrict the symlink's target. For example, |
| 1929 |
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"ln -s .htpasswd /var/www/html/readme.html" by CGI program should be |
| 1930 |
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blocked because we will allow Apache to read both |
| 1931 |
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/var/www/html/readme.html and /var/www/html/.htpasswd . |
| 1932 |
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| 1933 |
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Thus, I added new condition, "symlink.target". |
| 1934 |
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| 1935 |
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allow_symlink /var/www/html/\*.html if symlink.target="\*.html" |
| 1936 |
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| 1937 |
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allow_symlink /var/www/html/\*\-.\* if symlink.target="\*\-.\*" |
| 1938 |
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| 1939 |
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@ Don't return -EAGAIN at ccs_socket_recvmsg_permission(). |
| 1940 |
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| 1941 |
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It turned out that it is not permitted for accept() and recvmsg() to |
| 1942 |
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return -EAGAIN if poll() said connections/datagrams are ready. However, |
| 1943 |
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recvmsg() may return -EAGAIN and potentially confuse some applications |
| 1944 |
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because ccs_socket_recvmsg_permission() is returning -EAGAIN. |
| 1945 |
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| 1946 |
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Thus, I modified ccs_socket_recvmsg_permission() to return -ENOMEM |
| 1947 |
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rather than -EAGAIN. |
| 1948 |
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| 1949 |
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Fix 2009/05/19 |
| 1950 |
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| 1951 |
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@ Don't call get_fs_type() with a mutex held. |
| 1952 |
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| 1953 |
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Until now, when ccs_update_mount_acl() is called with unsupported |
| 1954 |
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filesystem, /sbin/modprobe is executed from get_fs_type() to load |
| 1955 |
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filesystem module. And get_fs_type() does not return until /sbin/modprobe |
| 1956 |
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finishes. |
| 1957 |
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| 1958 |
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This means that it will cause deadlock if /sbin/modprobe (which is |
| 1959 |
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executed via get_fs_type() in ccs_update_mount_acl()) calls |
| 1960 |
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ccs_update_mount_acl(); although it won't happen unless an administrator |
| 1961 |
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inserts execute_handler to call mount() requests in learning mode or to |
| 1962 |
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add "allow_mount" entries to /proc/ccs/system_policy . |
| 1963 |
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| 1964 |
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I modified to unlock the mutex before calling get_fs_type(). |
| 1965 |
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| 1966 |
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Fix 2009/05/20 |
| 1967 |
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| 1968 |
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@ Update recvmsg() hooks. |
| 1969 |
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| 1970 |
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Since 1.5.0, I was doing network access control for incoming UDP and RAW |
| 1971 |
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packets inside skb_recv_datagram(). But to synchronize with LSM version, |
| 1972 |
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I moved ccs_recv_datagram_permission() hook from skb_recv_datagram() to |
| 1973 |
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udp_recvmsg()/udpv6_recvmsg()/raw_recvmsg()/rawv6_recvmsg() with name |
| 1974 |
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change to ccs_recvmsg_permission(). |
| 1975 |
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| 1976 |
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Version 1.6.8 2009/05/28 Feature enhancement release. |
| 1977 |
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| 1978 |
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Fix 2009/07/03 |
| 1979 |
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| 1980 |
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@ Fix buffer overrun when used with CONFIG_SLOB=y . |
| 1981 |
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| 1982 |
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Since 1.6.7 , ccs_allocate_execve_entry() was requesting for only 4000 |
| 1983 |
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bytes while the comment says it is 4096 bytes. This may lead to buffer |
| 1984 |
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overrun when slob allocator is used, for slob allocator allocates exactly |
| 1985 |
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4000 bytes whereas slab and slub allocators allocate 4096 bytes. |
| 1986 |
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| 1987 |
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Fix 2008/09/01 |
| 1988 |
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| 1989 |
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@ Add garbage collector support. |
| 1990 |
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| 1991 |
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Until now, it was impossible to release memory used by deleted policy. |
| 1992 |
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I added SRCU based garbage collector so that memory used by deleted |
| 1993 |
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policy will be automatically released. |
| 1994 |
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| 1995 |
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@ Remove word length limitation and line length limitation. |
| 1996 |
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| 1997 |
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Until now, the max length of a word is 4000 and the max length of a line |
| 1998 |
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is 8192. To be able to handle longer pathnames, I removed these |
| 1999 |
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limitations. Now, the max length (except the domainname and the strings |
| 2000 |
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used in "if" clause) is 128K (which is the max amount of memory kmalloc() |
| 2001 |
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can allocate in most environments). |
| 2002 |
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| 2003 |
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@ Support more fine grained profile configuration. |
| 2004 |
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| 2005 |
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Profile was reconstructed. |
| 2006 |
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| 2007 |
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@ Support more fine grained parameters restrictions. |
| 2008 |
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| 2009 |
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"allow_create", "allow_mkdir", "allow_mkfifo", "allow_mksock" check |
| 2010 |
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create mode. "allow_mkblock" and "allow_mkchar" check create mode, |
| 2011 |
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major device number, minor device number. "allow_chmod" check new mode. |
| 2012 |
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"allow_chown" checks new owner. "allow_chgrp" checks new group. |
| 2013 |
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| 2014 |
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@ Allow number grouping. |
| 2015 |
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| 2016 |
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To help specifying numeric values, a new keyword "number_group" is |
| 2017 |
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introduced. |
| 2018 |
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| 2019 |
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@ Remove "alias" directive and "allow_argv0" directive. |
| 2020 |
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| 2021 |
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Until now, "allow_execute" used dereferenced pathname if it is a symlink |
| 2022 |
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unless explicitly specified by "alias" directive. |
| 2023 |
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| 2024 |
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Now, "allow_execute" uses symlink's pathname if it is a symlink. |
| 2025 |
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"exec.realpath" in "if" clause checks the dereferenced pathname. |
| 2026 |
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"exec.argv[0]" in "if" clause checks the invocation name. |
| 2027 |
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| 2028 |
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@ Remove /proc/ccs/system_policy and /etc/ccs/system_policy.conf . |
| 2029 |
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| 2030 |
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"deny_autobind" was moved to /proc/ccs/exception_policy and |
| 2031 |
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/etc/ccs/exception_policy.conf . Other directives were moved to |
| 2032 |
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/proc/ccs/domain_policy and /etc/ccs/domain_policy.conf . |
| 2033 |
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| 2034 |
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@ Remove syaoran filesystem. |
| 2035 |
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| 2036 |
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Since "allow_create"/"allow_mkdir"/"allow_mkfifo"/"allow_mksock"/ |
| 2037 |
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"allow_mkblock"/"allow_mkchar"/"allow_chmod"/"allow_chown"/"allow_chgrp" |
| 2038 |
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can restrict mode changes and owner/group changes, there is no need to |
| 2039 |
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restrict these changes at filesystem level. |
| 2040 |
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| 2041 |
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Thus, I removed syaoran filesystem. |
| 2042 |
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| 2043 |
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@ Reduce spinlocks. |
| 2044 |
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| 2045 |
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Until now, TOMOYO was using own list for detecting memory leak. But as |
| 2046 |
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kernel 2.6.31 introduced memory leak detection mechanism |
| 2047 |
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( CONFIG_DEBUG_KMEMLEAK ), TOMOYO no longer needs to use own list. |
| 2048 |
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| 2049 |
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I removed the list to ruduce use of spinlocks. |
| 2050 |
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| 2051 |
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@ Rewrite ccs-patch-2.\*.diff . |
| 2052 |
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| 2053 |
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ccs-patch-2.\*.diff was rewriteen like LSM hooks. |
| 2054 |
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| 2055 |
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@ Don't check "allow_read/write" for open-for-ioctl-only. |
| 2056 |
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| 2057 |
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open(pathname, 3) means open for ioctl() only. |
| 2058 |
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Until now, TOMOYO was checking "allow_read/write" for open(pathname, 3). |
| 2059 |
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But since TOMOYO checks "allow_ioctl" for ioctl(), I modified not to |
| 2060 |
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require "allow_read/write" for open(pathname, 3). |
| 2061 |
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| 2062 |
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@ Add missing sigqueue() and tgsigqueue() hooks. |
| 2063 |
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| 2064 |
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Until now, kill(), tkill(), tgkill() had hooks but sigqueue() and |
| 2065 |
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tgsigqueue() didn't. |
| 2066 |
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| 2067 |
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@ Move files from fs/ to security/ccsecurity. |
| 2068 |
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| 2069 |
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Config menu section changed from "File systems" to "Security options". |
| 2070 |
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| 2071 |
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Kernel config symbols changed from CONFIG_SAKURA CONFIG_TOMOYO |
| 2072 |
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CONFIG_SYAORAN to CONFIG_CCSECURITY . |
| 2073 |
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| 2074 |
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@ Add global PID to audit logs. |
| 2075 |
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| 2076 |
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ccs-queryd was using domainname for reaching the domain which the process |
| 2077 |
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belongs to, but the domain could be deleted while ccs-queryd is handling |
| 2078 |
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policy violation. If the domain is deleted, ccs-queryd no longer can |
| 2079 |
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reach the domain by domainname. Thus, ccs-queryd now uses PID for |
| 2080 |
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reaching the domain which the process belongs to. |
| 2081 |
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| 2082 |
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Kernel 2.6.24 introduced PID namespace. The PID in access logs generated |
| 2083 |
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by a process inside a container is useless for ccs-queryd for reaching |
| 2084 |
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the domain which the process belongs to. |
| 2085 |
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| 2086 |
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Thus, I added global PID in audit logs. |
| 2087 |
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| 2088 |
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@ Transit to new domain before do_execve() suceeds. |
| 2089 |
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| 2090 |
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Permission checks for interpreters and environment variables are |
| 2091 |
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done using new domain. In order to be allow ccs-queryd to reach the new |
| 2092 |
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domain via global PID, I reverted "Don't transit to new domain until |
| 2093 |
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do_execve() succeeds." made on 2008/10/07. |
| 2094 |
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| 2095 |
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Version 1.7.0 2008/09/03 Feature enhancement release. |
TOMOYO
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