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Commits on Aug 21, 2011
  1. bumped version to 2.0.0rc4

    committed Aug 21, 2011
  2. Added version specific ChangeLog, ShortLog, and diffstat files.

    Added version specific ChangeLog, ShortLog, and diffstat files (these go all
    the way back to the beginning of the svn import since 2.0.0 will be the
    first official non-"rc" release of the new C code).
    committed Aug 21, 2011
  3. Updated ChangeLog with all changes from 2.0.0-rc3

    Updated ChangeLog with all changes from 2.0.0-rc3
    committed Aug 21, 2011
  4. Bug fix for ipfw firewalls to not always require seeing 'Dynamic' rules

    This commit fixes an issue on ipfw firewalls where fwknopd would always require
    seeing ipfw 'Dynamic' rules associated with newly added connections.  But, such
    connections may never be established for various reasons.  Previous to this
    commit the following warning was frequently generated by fwknopd:
    Unexpected error: did not find 'Dynamic rules' string in list output.
    committed Aug 21, 2011
  5. Bug fix for missing set existence check on ipfw firewalls

    This commit fixes an issues on systems running the ipfw firewall where the
    'set' where fwknopd puts new access rules was attempted to be deleted without
    first checking to see whether it exists.  The following errors would be
    generated (now fixed):
    ipfw: rule 16777217: setsockopt(IP_FW_DEL): Invalid argument
    Error 17664 from cmd:'/sbin/ipfw delete set 1':
    Fatal: Errors detected during ipfw rules initialization.
    committed Aug 21, 2011
  6. Bug fix to create the digest.cache file at init

    Bug fix to ensure that the digest.cache file gets created at fwknopd init time
    so fwknopd does not throw the following error:
    Error opening digest cache file. Incoming digests will not be remembered.
    committed Aug 20, 2011
  7. On FreeBSD, made gpgme header path inclusion optional

    If gpgme is installed on FreeBSD systems it appears that
    -I/usr/local/include/gpgme must be added to the include path, but this change
    only adds the path if gpgme is installed and going to be used.
    committed Aug 20, 2011
Commits on Aug 20, 2011
  1. Fixed a few minor compiler warnings on FreeBSD

    This commit fixes a few warnings about possible uninitialized and unused
    committed Aug 20, 2011
  2. On FreeBSD disable read-only relocations and immediate binding protec…

    gcc on FreeBSD generates the following errors when the -Wl,-z,relro -Wl,-z,now
    flags are used:
    gcc: -z: linker input file unused because linking not done
    gcc: relro: linker input file unused because linking not done
    gcc: -z: linker input file unused because linking not done
    gcc: now: linker input file unused because linking not done
    committed Aug 20, 2011
  3. Update to suppress additional compiler warning

    This change fixes the following compiler warning that was seen with many of
    the source files in server/
    fwknopd_common.h:223: warning: ‘config_map’ defined but not used
    committed Aug 20, 2011
  4. Minor restructuring to suppress compiler "defined but not used warnings"

    This commit fixes several compiler warnings like the following (now that -Wall
    is the default):
    config_init.h:68: warning: ‘cmd_opts’ defined but not used
    committed Aug 20, 2011
  5. Added -Wall for all gcc warnings during compile

    Enable gcc compilation to include -Wall for all warnings (can be disabled
    with --disable-wall to ./configure).
    committed Aug 19, 2011
  6. Bug fix for ./configure args to disable compile time security options

    The ./configure script would generate the following error for the attempted
    use of the --without-stackprotector (and other related options like
    configure: WARNING: unrecognized options: --without-stackprotect
    committed Aug 19, 2011
Commits on Aug 19, 2011
  1. added the VERSION file

    committed Aug 18, 2011
  2. Bumped version to fwknop-2.0.0-rc3

    Bumped version to fwknop-2.0.0-rc3
    committed Aug 18, 2011
  3. Added ChangeLog derived from git commit messages.

    There will be branch and release specific ChangeLog files as well.
    committed Aug 18, 2011
  4. Renamed ChangeLog -> ChangeLog.old for new ChangeLog handling

    The ChangeLog will be derived from commit messages.
    committed Aug 18, 2011
  5. Update to add any missing iptables jump rules

    Upon the receipt of a valid SPA packet, a check is done to make sure that
    a jump rule from the appropriate built-in iptables chains exists to the
    fwknop chains.  Such rules could have been deleted by other manipulations
    of the iptables policy, so it is important to ensure they exist.  Running
    in foreground (-f) mode, here is an illustration of the jump rule being
    added after it got deleted:
    SPA Packet from IP: received.
    Added jump rule from chain: INPUT to chain: FWKNOP_INPUT
    Added Rule to FWKNOP_INPUT for, tcp/22 expires at 1313680648
    committed Aug 18, 2011
Commits on Aug 18, 2011
  1. Update to force base64 check for all SPA data

    Previous to this change a check was done for base64 characters in incoming
    SPA data only up to MIN_SPA_DATA_SIZE.  This check may be reinstantiated for
    SPA packets that are delivered over HTTP (and the packet data is embedded
    within a URL that may also contain non-base64 chars), but in the meantime the
    fwknopd daemon should not accept SPA packets over arbitrary ports with any
    non-base64 chars.
    committed Aug 17, 2011
  2. Updated replay warnings to include proto/port info

    Replay warnings now include port and protocol information.  Here is an example:
    SPA Packet from IP: received.
    Replay detected from source IP:
            Destination proto/port: 17/62201
                Original source IP:
           Original dst proto/port: 17/62201
                     Entry created: 08/17/11 21:06:07
                      First replay: 08/17/11 21:06:32
                       Last replay: 08/17/11 21:06:45
                      Replay count: 7
    committed Aug 17, 2011
  3. Added stack protection, PIE, fortify source, etc.

    Added various security options that can be enabled at compile time.  These
    options include everything that the "hardening-check" script written by Kees
    Cook checks for.  After this change, the hardening-check script produces the
    following output against the fwknopd binary:
    $ hardening-check server/.libs/fwknopd
     Position Independent Executable: yes
     Stack protected: yes
     Fortify Source functions: yes
     Read-only relocations: yes
     Immediate binding: yes
    One of the compile outputs (for example) that shows the new options is:
    /bin/bash ../libtool --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I. -I..     -g -O2 -fstack-protector-all -fPIE -pie -D_FORTIFY_SOURCE=2 -Wl,-z,relro -Wl,-z,now -MT fko_decode.lo -MD -MP -MF .deps/fko_decode.Tpo -c -o fko_decode.lo fko_decode.c
    From the hardening-check man page, here is a description of each of these
           hardening-check - check binaries for security hardening features
           Examine a given set of ELF binaries and check for several security
           hardening features, failing if they are not all found.
           This utility checks a given list of ELF binaries for several security
           hardening features that can be compiled into an executable.  These
           features are:
           Position Independent Executable
                   This indicates that the executable was built in such a way
                   (PIE) that the "text" section of the program can be relocated
                   in memory.  To take full advantage of this feature, the
                   executing kernel must support text Address Space Layout
                   Randomization (ASLR).
           Stack Protected
                   This indicates that the executable was compiled with the
                   gcc(1) option -fstack-protector.  The program will be
                   resistant to have its stack overflowed.
           Fortify Source functions
                   This indicates that the executable was compiled with
                   -D_FORTIFY_SOURCE=2 and -O2 or higher.  This causes certain
                   unsafe glibc functions with their safer counterparts (e.g.
                   strncpy instead of strcpy).
           Read-only relocations
                   This indicates that the executable was build with -Wl,-z,relro
                   to have ELF markings (RELRO) that ask the runtime linker to
                   mark any regions of the relocation table as "read-only" if
                   they were resolved before execution begins.  This reduces the
                   possible areas of memory in a program that can be used by an
                   attacker that performs a successful memory corruption exploit.
           Immediate binding
                   This indicates that the executable was built with -Wl,-z,now
                   to have ELF markings (BIND_NOW) that ask the runtime linker to
                   resolve all relocations before starting program execution.
                   When combined with RELRO above, this further reduces the
                   regions of memory available to memory corruption attacks.
    committed Aug 17, 2011
Commits on Aug 15, 2011
  1. Minor variable cleanup to fix compiler warnings

    Minor cleanup to fix compiler warnings about unused variables.
    committed Aug 14, 2011
  2. Added fwknop-2.0.0rc2 openwrt support from Jonathan Bennett

    Applied a patch sent from Jonathan Bennett to add fwknop-2.0.0rc2 support to
    openwrt.  One thing to note about this patch is that the +libgdbm library
    dependency has been removed because fwknop now implements its own digest
    tracking file without needing gdbm/ndbm on the system.
    committed Aug 14, 2011
Commits on Aug 14, 2011
  1. Implemented memory clean up for digest cache list

    Upon fwknopd shutdown, a new function free_replay_list() is now called in order
    to free heap allocated memory dedicated to SPA digest tracking.  Without this
    fix, valgrind reports the following (some output snipped):
    valgrind --leak-check=full ./server/.libs/fwknopd -f -i lo -P "udp port 62201"
    ==30864== 431 (48 direct, 383 indirect) bytes in 1 blocks are definitely lost in loss record 17 of 17
    ==30864==    at 0x4C27480: calloc (vg_replace_malloc.c:467)
    ==30864==    by 0x407CB7: replay_check_file_cache (replay_cache.c:461)
    ==30864==    by 0x407B69: replay_check (replay_cache.c:413)
    ==30864==    by 0x405813: incoming_spa (incoming_spa.c:363)
    ==30864==    by 0x406275: pcap_capture (pcap_capture.c:223)
    ==30864==    by 0x40317D: main (fwknopd.c:297)
    committed Aug 14, 2011
  2. Consolidated replay warnings in a single function

    For both the simple digest file cache and the gdbm/ndbm tracking methods, all
    replay warnings are generated by a single function "replay_warning()".
    committed Aug 14, 2011
  3. Added digest file import code

    The digest file is now imported as a linked list of digest cache entries at
    init time for SPA replay attack detection.
    committed Aug 13, 2011
  4. Added source port and protocol to digest tracking

    Added the source port and protocol fields to valid SPA packets in the digest
    cache.  This can help to discover replay trends.  The format of the digest
    file cache is now:
    <digest> <proto> <src_ip> <src_port> <dst_ip> <dst_port> <time>
    committed Aug 13, 2011
Commits on Aug 13, 2011
  1. Added dst IP to tracked SPA data

    The digest cache now contains destination IP addresses of valid SPA packets.
    The complete format is now:
    <digest> <src_ip> <dst_ip> <creation time>
    committed Aug 12, 2011
  2. Started on code to parse the digest cache file

    At init time fwknopd will read in the digest cache file into the in-memory
    linked list of digests for SPA replay detection. This commit starts on this
    code, but the file format does not yet include destination IP addresses
    (to be added in an upcoming commit).
    committed Aug 12, 2011
  3. Implemented linked list cache of SPA digests

    When not using gdbm/ndbm support (the default now), fwknopd implements a linked
    list of SPA packet digests for replay attack detection along with writing
    digest data in ascii text down to disk (in the CONF_DIGEST_FILE file).
    committed Aug 12, 2011
Commits on Aug 11, 2011
  1. Added --pcap-filter to the fwknopd command line

    To override the value of the PCAP_FILTER variable in the fwknopd.conf
    config file, a new fwknopd command line argument "--pcap-filter" was
    added.  This assists in various activities by making it trivial to
    change how fwknopd acquires packet data without editing the fwknopd.conf
    file.  Here is an example:
    fwknopd -i lo -f --pcap-filter "udp port 12345"
    committed Aug 10, 2011
  2. Updated digest file path for gdbm/ndbm support

    If fwknopd is compiled with --disable-file-cache to the ./configure script
    then it will assume that the default filename is "digest_db.cache" for the
    digest cache.  If the file cache method is used (this is the default), then
    "digest.cache" is the default filename.  A new variable DIGEST_DB_FILE in
    the fwknopd.conf file controls the digest filename if gdbm/ndbm support is
    committed Aug 10, 2011
  3. Added autoconf support for non-dbm file cache.

    This change starts on support for a simple file-based cache mechanism
    for tracking SPA digests.  This removes the libgdbm/libndbm dependency
    by default, but it can be re-enabled with the --disable-file-cache
    argument to the ./configure script.
    committed Aug 10, 2011
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