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1.33      tj          5: <title>OpenBSD: Innovations</title>
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1.35      tb          8: <link rel="canonical" href="https://www.openbsd.org/innovations.html">
1.1       schwarze    9:
1.77      bentley    10: <h2 id=OpenBSD>
                     11: <a href="index.html">
                     12: <i>Open</i><b>BSD</b></a>
                     13: Innovations
                     14: </h2>
1.31      deraadt    15:
                     16: <hr>
1.32      tj         17: <p>
1.59      job        18:     This is a list of software and ideas developed or maintained by the OpenBSD
                     19:     project, sorted in order of approximate introduction. Some of them are
                     20:     explained in detail in our <a href="events.html">research papers</a>.
                     21: </p>
1.32      tj         22: <hr>
1.1       schwarze   23:
1.59      job        24: <h3>Concepts</h3>
1.1       schwarze   25:
                     26: <ul>
1.78      deraadt    27:     <li><a href="https://man.openbsd.org/ipsec.4">ipsec(4)</a>:
                     28:        Started by John Ioannidis, Angelos D. Keromytis, Niels Provos, and
                     29:        Niklas Hallqvist, imported February 20, 1997.  OpenBSD was the first
                     30:        free operating system to provide an IPSec stack.
                     31:     <li><a href="https://man.openbsd.org/inet6.4">inet6(4)</a>:
                     32:        First complete integration and adoption of IPv6 led by
                     33:        "Itojun" (Dr. Junichiro Hagino) [WIDE/KAME], Craig Metz [NRL], and
                     34:        Angelos D. Keromytis starting Jan 6, 1999.
                     35:        Almost fully operational Jun 6, 1999 during the
                     36:        <a href="hackathons.html">first OpenBSD hackathon</a>.
                     37:        OpenBSD 2.7.
                     38:     <li><strong>Privilege separation</strong>:
                     39:        First implemented by
                     40:        <a href="http://www.citi.umich.edu/u/provos/ssh/privsep.html">Niels Provos</a>
                     41:        and Markus Friedl in OpenSSH in March 2002, released with OpenBSD 3.2.
                     42:        The concept is now used in many OpenBSD programs, for example
                     43:        <a href="https://man.openbsd.org/bgpd.8">bgpd(8)</a>,
                     44:        <a href="https://man.openbsd.org/dhclient.8">dhclient(8)</a>,
                     45:        <a href="https://man.openbsd.org/dhcpd.8">dhcpd(8)</a>,
                     46:        <a href="https://man.openbsd.org/dvmrpd.8">dvmrpd(8)</a>,
                     47:        <a href="https://man.openbsd.org/eigrpd.8">eigrpd(8)</a>,
                     48:        <a href="https://man.openbsd.org/file.1">file(1)</a>,
                     49:        <a href="https://man.openbsd.org/httpd.8">httpd(8)</a>,
                     50:        <a href="https://man.openbsd.org/iked.8">iked(8)</a>,
                     51:        <a href="https://man.openbsd.org/ldapd.8">ldapd(8)</a>,
                     52:        <a href="https://man.openbsd.org/ldpd.8">ldpd(8)</a>,
                     53:        <a href="https://man.openbsd.org/mountd.8">mountd(8)</a>,
                     54:        <a href="https://man.openbsd.org/npppd.8">npppd(8)</a>,
                     55:        <a href="https://man.openbsd.org/ntpd.8">ntpd(8)</a>,
                     56:        <a href="https://man.openbsd.org/ospfd.8">ospfd(8)</a>,
                     57:        <a href="https://man.openbsd.org/ospf6d.8">ospf6d(8)</a>,
                     58:        <a href="https://man.openbsd.org/pflogd.8">pflogd(8)</a>,
                     59:        <a href="https://man.openbsd.org/radiusd.8">radiusd(8)</a>,
                     60:        <a href="https://man.openbsd.org/relayd.8">relayd(8)</a>,
                     61:        <a href="https://man.openbsd.org/ripd.8">ripd(8)</a>,
                     62:        <a href="https://man.openbsd.org/script.1">script(1)</a>,
                     63:        <a href="https://man.openbsd.org/smtpd.8">smtpd(8)</a>,
                     64:        <a href="https://man.openbsd.org/syslogd.8">syslogd(8)</a>,
                     65:        <a href="https://man.openbsd.org/tcpdump.8">tcpdump(8)</a>,
                     66:        <a href="https://man.openbsd.org/tmux.1">tmux(1)</a>,
                     67:        <a href="https://man.openbsd.org/xconsole.1">xconsole(1)</a>,
                     68:        <a href="https://man.openbsd.org/xdm.1">xdm(1)</a>,
                     69:        <a href="https://man.openbsd.org/Xserver.1">Xserver(1)</a>,
                     70:        <a href="https://man.openbsd.org/ypldap.8">ypldap(8)</a>,
                     71:        <a href="https://man.openbsd.org/pkg_add.1">pkg_add(1)</a>,
                     72:        etc.
                     73:     <li><strong>Privilege revocation</strong>:
                     74:        Related to the work on privilege separation, some programs were refactored
                     75:        to drop privileges while holding onto a tricky resource such as a raw socket,
                     76:        reserved port, or modification-locked bpf(4) descriptor,
                     77:        for example
                     78:        <a href="https://man.openbsd.org/ping.8">ping(8)</a>,
                     79:        <a href="https://man.openbsd.org/traceroute.8">traceroute(8)</a>,
                     80:        etc.
                     81:     <li><strong>Stack protector</strong>:
                     82:        Developed since 2001 as "propolice" by Hiroaki Etoh. Integrated, and
                     83:        implemented for additional hardware platforms, by Miod Vallat and Theo
                     84:        de Raadt.  OpenBSD 3.3 was the first operating system to enable it
                     85:        systemwide by default.
                     86:     <li><strong>W^X</strong>:
                     87:        First used for sparc, sparc64, alpha, and hppa in OpenBSD 3.3.
                     88:        Strictly enforced by default since OpenBSD 6.0: a program can only
                     89:        violate it if the executable is marked with <code>PT_OPENBSD_WXNEEDED</code>
                     90:        and it is located on a filesystem mounted with the <code>wxallowed</code>
                     91:        <a href="https://man.openbsd.org/mount.8">mount(8)</a> option.
                     92:     <li><strong>GOT and PLT protection</strong> by ld.so:
                     93:        first done as part of the W^X work in OpenBSD 3.3, by Dale Rahn and
                     94:        Theo de Raadt. The GOT and PLT regions are read-only outside of ld.so
                     95:        itself. Extended to the .init/.fini sections (constructors and
                     96:        destructors) in OpenBSD 3.4.
                     97:     <li><strong>ASLR</strong>:
                     98:        OpenBSD 3.4 was the first widely used operating system to
                     99:        provide it by default.
                    100:     <li><a href="https://man.openbsd.org/gcc-local.1">gcc-local(1)</a>
                    101:        __attribute__((__bounded__)) static analysis annotation
                    102:        and checking mechanism:
                    103:        Started by Anil Madhavapeddy on June 26, 2003
                    104:        and ported to GCC 4 by Nicholas Marriott.
                    105:        First released with OpenBSD 3.4.
                    106:     <li><a href="https://man.openbsd.org/malloc.3">malloc(3)</a>
                    107:        randomization implemented by Thierry Deval. Guard pages and randomized (delayed) free added by Ted Unangst.
                    108:        Reimplemented by <a href="papers/eurobsdcon2009/otto-malloc.pdf">Otto Moerbeek</a>
                    109:        for OpenBSD 4.4.
                    110:     <li><strong>Position-independent executables (PIE)</strong>:
                    111:        OpenBSD 5.3 was the first widely used operating system to enable it
                    112:        globally by default, on seven hardware platforms.
                    113:        Implemented in November 2008 by
                    114:        <a href="https://www.openbsd.org/papers/nycbsdcon08-pie/">Kurt Miller</a>
                    115:        and enabled by default by
                    116:        <a href="https://www.openbsd.org/papers/asiabsdcon2015-pie-slides.pdf">Pascal Stumpf</a>
                    117:        in August 2012.
                    118:     <li><strong>Random-data memory</strong>:
                    119:        the ability to specify that a variable should be initialized
1.68      deraadt   120:        at load time with random byte values (placed into a new ELF
                    121:        <b>.openbsd.randomdata</b> section) was implemented in
                    122:        OpenBSD 5.3 by Matthew Dempsky.
1.78      deraadt   123:     <li><strong>Stack protector per shared object</strong>:
                    124:        using the random-data memory feature, each shared object was given its
                    125:        own stack protector cookie in OpenBSD 5.3 by Matthew Dempsky.
                    126:     <li><strong>Static-PIE</strong>:
                    127:        Position-independent static binaries for /bin, /sbin and ramdisks.
                    128:        Implemented for OpenBSD 5.7 by Kurt Miller and Mark Kettenis.
                    129:     <li><strong>SROP</strong>
                    130:        (<a href="https://man.openbsd.org/sigreturn.2">sigreturn(2)</a>
                    131:        oriented programming) mitigation: attacks researched by
                    132:        <a href="http://www.cs.vu.nl/~herbertb/papers/srop_sp14.pdf">Eric Bosman</a>
                    133:        and Herbert Bos in 2014, solution implemented by Theo de Raadt in May 2016,
                    134:        enabled by default since OpenBSD 6.0.
                    135:     <li><strong>Library order randomization</strong>:
                    136:        In <a href="https://man.openbsd.org/rc.8">rc(8)</a>, re-link
                    137:        <code>libc.so</code>, <code>libcrypto</code>, and <code>ld.so</code>
                    138:        on startup, placing the objects in a random order.
                    139:        Theo de Raadt and Robert Peichaer, May 2016,
                    140:        enabled by default since OpenBSD 6.0 and 6.2.
                    141:     <li>Kernel-assisted lazy-binding for W^X safety in multi-threaded programs.
                    142:        A new syscall <a href="https://man.openbsd.org/kbind.2">kbind(2)</a>
                    143:        permits lazy-binding to be W^X safe in multi-threaded programs.
                    144:        Implemented for OpenBSD 5.9 by Philip Guenther in July 2015.
                    145:     <li>Process layouts in memory tightened to remove execute permission from
                    146:        all segmented, non-instruction data and to remove write permission from
                    147:        data that is only modified during loading and relocation.
                    148:        By combining the RELRO (Read-Only after Relocation) design from the
                    149:        GNU project with the original ASLR work from OpenBSD 3.3 and
                    150:        strict lazy-binding work from OpenBSD 5.9, this is applied to not
                    151:        just a subset of programs and libraries but rather to all programs
                    152:        and libraries.
                    153:        Implemented for OpenBSD 6.1 by Philip Guenther in August 2016.
                    154:     <li>Use of <strong>fork+exec in privilege separated programs</strong>. The
                    155:        strategy is to give each process a fresh &amp; unique address space for
                    156:        ASLR, stack protector -- as protection against address space discovery attacks.
                    157:        Implemented first by
                    158:        Damien Miller (<a href="https://man.openbsd.org/sshd.8">sshd(8)</a> 2004),
                    159:        Claudio Jeker (<a href="https://man.openbsd.org/bgpd.8">bgpd(8)</a>, 2015),
                    160:        Eric Faurot (<a href="https://man.openbsd.org/smtpd.8">smtpd(8)</a>, 2016),
                    161:        Rafael Zalamena (various, 2016), and others.
                    162:     <li><strong>trapsleds</strong>:
                    163:        Reduction of incidental NOP instructions/sequences in the instruction
                    164:        stream which could be useful potentially for ROP attack methods to
                    165:        innaccurately target gadgets. These NOP sequences are converted into
                    166:        trap sequences where possible. Todd Mortimer and Theo de Raadt, June
                    167:        2017.
                    168:     <li><strong>Kernel relinking at boot</strong>:
                    169:        the .o files of the kernel are relinked in random order from a
                    170:        link-kit, before every reboot. This provides substantial interior
                    171:        randomization in the kernel's text and data segments for layout and
                    172:        relative branches/calls.  Basically a unique address space for each
                    173:        kernel boot, similar to the userland fork+exec model described above
                    174:        but for the kernel.  Theo de Raadt, June 2017.
1.61      deraadt   175:     <li>
                    176:        Rearranged i386/amd64 register allocator order in
                    177:        <a href="https://man.openbsd.org/clang.1">clang(1)</a>
                    178:        to reduce polymorphic RET instructions:
                    179:        Todd Mortimer, November 20, 2017.
1.64      deraadt   180:     <li>
1.72      mortimer  181:        Reencoding of i386/amd64 instruction sequences to avoid
                    182:        embedded polymorphic RET instructions.  Enhancements to
                    183:        <a href="https://man.openbsd.org/clang.1">clang(1)</a>
                    184:        Todd Mortimer, April 28, 2018 and onwards.
1.78      deraadt   185:     <li><b>MAP_STACK</b> addition to
1.64      deraadt   186:        <a href="https://man.openbsd.org/mmap.2">mmap(2)</a>
                    187:        allows opportunistic verification that the stack-register
                    188:        points at stack memory, therefore catching pivots to non-stack
                    189:        memory (sometimes used in ROP attacks).
                    190:        Theo de Raadt, April 12, 2018.
1.78      deraadt   191:     <li><b>RETGUARD</b> is a replacement for the <b>stack-protector</b>
                    192:        which uses a per-function random cookie (located in the read-only ELF
                    193:        <b>.openbsd.randomdata</b> section) to consistency-check the
                    194:        return address on the stack.  Implemented for AMD64 and ARM64
                    195:        by Todd Mortimer in OpenBSD 6.4.
                    196:     <li><b>MAP_CONCEAL</b> addition to
1.76      otto      197:        <a href="https://man.openbsd.org/mmap.2">mmap(2)</a>
                    198:        disallows memory pages to be written to core dumps, preventing
                    199:        accidental exposure of private information.
                    200:        Theo de Raadt, Mark Kettenis and Scott Soule Cheloha,
                    201:        February 2, 2019.
1.79    ! deraadt   202:     <li>Similar to the opportunistic verification in <b>MAP_STACK</b>,
        !           203:        system-calls can no longer be performed from PROT_WRITE memory.
        !           204:        Theo de Raadt, June 2, 2019.
1.17      mlarkin   205: </ul>
1.1       schwarze  206:
1.59      job       207: <h3>Functions</h3>
1.1       schwarze  208:
                    209: <ul>
1.78      deraadt   210:     <li><a href="https://man.openbsd.org/issetugid.2">issetugid(2)</a>:
                    211:        Theo de Raadt, August 25, 1996, OpenBSD 2.0
                    212:     <li><a href="https://man.openbsd.org/arc4random.3">arc4random(3)</a>:
                    213:        David Mazieres, December 28, 1996, OpenBSD 2.1
                    214:     <li><a href="https://man.openbsd.org/bcrypt.3">bcrypt(3)</a>:
                    215:        Implemented by <a href="https://www.usenix.org/legacy/events/usenix99/provos/provos_html/node1.html">Niels Provos and David Mazieres</a>
                    216:        Imported February 13, 1997 and first released with OpenBSD 2.1.
                    217:     <li><a href="https://man.openbsd.org/strlcpy.3">strlcpy(3)</a>,
                    218:        <a href="https://man.openbsd.org/strlcat.3">strlcat(3)</a>:
                    219:        Todd Miller and Theo de Raadt, July 1, 1998, OpenBSD 2.4
                    220:     <li><a href="https://man.openbsd.org/strtonum.3">strtonum(3)</a>:
                    221:        Ted Unangst, Todd Miller, and Theo de Raadt, May 3, 2004, OpenBSD 3.6
                    222:     <li><a href="https://man.openbsd.org/imsg_init.3">imsg</a>:
                    223:        Message passing API, written by Henning Brauer.
                    224:        In libutil since May 26, 2010, OpenBSD 4.8;
                    225:        used by various daemons before that.
                    226:     <li><a href="https://man.openbsd.org/timingsafe_bcmp.3">timingsafe_bcmp(3)</a>:
                    227:        Damien Miller, July 13, 2010, OpenBSD 4.9
                    228:     <li><a href="https://man.openbsd.org/explicit_bzero.3">explicit_bzero(3)</a>:
                    229:        Ted Unangst and Matthew Dempsky, January 22, 2014, OpenBSD 5.5
                    230:     <li><a href="https://man.openbsd.org/ohash_init.3">ohash</a>:
                    231:        Written and maintained by Marc Espie.
                    232:        In libutil since May 12, 2014, OpenBSD 5.6;
                    233:        used by make(1) and m4(1) before that.
                    234:     <li><a href="https://man.openbsd.org/asr_run.3">asr</a>:
                    235:        Replacement resolver written and maintained by Eric Faurot.
                    236:        Imported April 14, 2012; activated on March 26, 2014, OpenBSD 5.6.
                    237:     <li><a href="https://man.openbsd.org/reallocarray.3">reallocarray(3)</a>:
                    238:        Theo de Raadt and Ted Unangst, April 22, 2014, OpenBSD 5.6
                    239:     <li><a href="https://man.openbsd.org/getentropy.2">getentropy(2)</a>:
                    240:        Matthew Dempsky and Theo de Raadt, June 13, 2014, OpenBSD 5.6
                    241:     <li><a href="https://man.openbsd.org/sendsyslog.2">sendsyslog(2)</a>:
                    242:        Theo de Raadt, July 10, 2014, OpenBSD 5.6
                    243:     <li><a href="https://man.openbsd.org/timingsafe_memcmp.3">timingsafe_memcmp(3)</a>:
                    244:        Matthew Dempsky, July 13, 2014, OpenBSD 5.6
                    245:     <li><a href="https://man.openbsd.org/pledge.2">pledge(2)</a>:
                    246:        Theo de Raadt, July 19, 2015, OpenBSD 5.9
                    247:     <li><a href="https://man.openbsd.org/getpwnam_shadow.3">getpwnam_shadow(3)</a>,
                    248:        <a href="https://man.openbsd.org/getpwuid_shadow.3">getpwuid_shadow(3)</a>:
                    249:        Ted Unangst and Theo de Raadt, November 18, 2015, OpenBSD 5.9
                    250:     <li><a href="https://man.openbsd.org/recallocarray.3">recallocarray(3)</a>:
                    251:        Otto Moerbeek, Joel Sing and Theo de Raadt, March 6, 2017, OpenBSD 6.1
                    252:     <li><a href="https://man.openbsd.org/freezero.3">freezero(3)</a>:
                    253:        Otto Moerbeek, April 10, 2017, OpenBSD 6.2
                    254:     <li><a href="https://man.openbsd.org/unveil.2">unveil(2)</a>:
                    255:        Theo de Raadt and Bob Beck, July 13, 2018, OpenBSD 6.4
                    256:     <li><a href="https://man.openbsd.org/malloc_conceal.3">malloc_conceal(3)</a>
1.76      otto      257:        and
1.78      deraadt   258:        <a href="https://man.openbsd.org/calloc_conceal.3">calloc_conceal(3)</a>:
                    259:        Otto Moerbeek, May 10, 2019, OpenBSD 6.5
1.16      deraadt   260: </ul>
                    261:
1.59      job       262:
                    263: <h3>Programs and subsystems</h3>
1.16      deraadt   264:
                    265: <ul>
1.78      deraadt   266:     <li><a href="https://man.openbsd.org/ypbind.8">ypbind(8)</a>,
                    267:        <a href="https://man.openbsd.org/ypset.8">ypset(8)</a>,
                    268:        <a href="https://man.openbsd.org/ypcat.1">ypcat(1)</a>,
                    269:        <a href="https://man.openbsd.org/ypmatch.1">ypmatch(1)</a>,
                    270:        <a href="https://man.openbsd.org/ypwhich.1">ypwhich(1)</a>,
                    271:        and libc support: Started by Theo de Raadt.
                    272:        Imported April 26, 1993 and first released with NetBSD 0.9.
                    273:     <li><a href="https://man.openbsd.org/ypserv.8">ypserv(8)</a>:
                    274:        Started by Mats O. Jansson in 1994.
                    275:        Imported October 23, 1995 and first released with OpenBSD 2.0.
                    276:     <li><a href="https://man.openbsd.org/mopd.8">mopd(8)</a>:
                    277:        Started by Mats O. Jansson in 1993.
                    278:        Imported September 21, 1996 and first released with OpenBSD 2.0.
                    279:     <li><a href="anoncvs.html">AnonCVS</a>:
                    280:        Designed and implemented by Chuck Cranor and Theo de Raadt in 1995
                    281:        (<a href="papers/anoncvs-paper.pdf">paper</a>,
                    282:        <a href="papers/anoncvs-slides.pdf">slides</a>)
                    283:     <li><a href="https://man.openbsd.org/aucat.1">aucat(1)</a>:
                    284:        Started by Kenneth Stailey.
                    285:        Imported January 2, 1997 and first released with OpenBSD 2.1.
                    286:        Now maintained by Alexandre Ratchov.
                    287:     <li><a href="https://www.openssh.com/">OpenSSH</a>
                    288:        including <a href="https://man.openbsd.org/ssh.1">ssh(1)</a>,
                    289:        <a href="https://man.openbsd.org/scp.1">scp(1)</a>,
                    290:        <a href="https://man.openbsd.org/sftp.1">sftp(1)</a>,
                    291:        <a href="https://man.openbsd.org/ssh-add.1">ssh-add(1)</a>,
                    292:        <a href="https://man.openbsd.org/ssh-agent.1">ssh-agent(1)</a>,
                    293:        <a href="https://man.openbsd.org/ssh-keygen.1">ssh-keygen(1)</a>,
                    294:        <a href="https://man.openbsd.org/sshd.8">sshd(8)</a>,
                    295:        <a href="https://man.openbsd.org/sftp-server.8">sftp-server(8)</a>:
                    296:        Started by Aaron Campbell, Bob Beck, Dug Song, Markus Friedl,
                    297:        Niels Provos, and Theo de Raadt
                    298:        as a fork of SSH 1.2.12 by Tatu Ylonen.
                    299:        Imported September 26, 1999 and first released with OpenBSD 2.6.
                    300:        Now maintained by Markus Friedl, Damien Miller, Darren Tucker, and
                    301:        Theo de Raadt.
                    302:     <li><a href="https://man.openbsd.org/mg.1">mg(1)</a>:
                    303:        Started by Dave Conroy in November 1986.
                    304:        Imported February 25, 2000 and first released with OpenBSD 2.7.
                    305:        Now maintained by Mark Lumsden.
                    306:     <li><a href="https://man.openbsd.org/m4.1">m4(1)</a>:
                    307:        Originally implemented by Ozan Yigit and Richard A. O'Keefe for 4.3BSD-Reno.
                    308:        Considerably extended and maintained by Marc Espie since 1999.
                    309:     <li><a href="https://man.openbsd.org/pf.4">pf(4)</a>,
                    310:        <a href="https://man.openbsd.org/pfctl.8">pfctl(8)</a>,
                    311:        <a href="https://man.openbsd.org/pflogd.8">pflogd(8)</a>,
                    312:        <a href="https://man.openbsd.org/authpf.8">authpf(8)</a>,
                    313:        <a href="https://man.openbsd.org/ftp-proxy.8">ftp-proxy(8)</a>:
                    314:        Started by Daniel Hartmeier as a replacement for the non-free ipf by
                    315:        Darren Reed. Imported June 24, 2001 and first released with OpenBSD
                    316:        3.0. Now maintained by Henning Brauer.
                    317:     <li><a href="https://man.openbsd.org/OpenBSD-5.9/systrace.4">systrace(4)</a>,
                    318:        <a href="https://man.openbsd.org/OpenBSD-5.9/systrace.1">systrace(1)</a>:
                    319:        Started by Niels Provos.
                    320:        Imported June 4, 2002 and first released with OpenBSD 3.2.
                    321:        Deleted after OpenBSD 5.9 because
                    322:        <a href="https://man.openbsd.org/pledge.2">pledge(2)</a> is even better.
                    323:     <li><a href="https://man.openbsd.org/spamd.8">spamd(8)</a>:
                    324:        Written by Bob Beck. Imported December 21, 2002 and first released with
                    325:        OpenBSD 3.3.
                    326:     <li><a href="https://man.openbsd.org/dc.1">dc(1)</a>:
                    327:        Written and maintained by Otto Moerbeek.
                    328:        Imported September 19, 2003 and first released with OpenBSD 3.5.
                    329:     <li><a href="https://man.openbsd.org/bc.1">bc(1)</a>:
                    330:        Written and maintained by Otto Moerbeek.
                    331:        Imported September 25, 2003 and first released with OpenBSD 3.5.
                    332:     <li><a href="https://man.openbsd.org/sensorsd.8">sensorsd(8)</a>:
                    333:        Started by Henning Brauer.
                    334:        Imported September 24, 2003 and first released with OpenBSD 3.5.
                    335:        Reworked by Constantine A. Murenin.
                    336:     <li><a href="https://man.openbsd.org/pkg_add.1">pkg_add(1)</a>:
                    337:        Written and maintained by Marc Espie.
                    338:        Imported October 16, 2003 and first released with OpenBSD 3.5.
                    339:     <li><a href="https://man.openbsd.org/carp.4">carp(4)</a>:
                    340:        Written by Mickey Shalayeff, Markus Friedl, Marco Pfatschbacher,
                    341:        and Ryan McBride.
                    342:        Imported October 17, 2003 and first released with OpenBSD 3.5.
                    343:     <li><a href="http://www.openbgpd.org/">OpenBGPD</a>
                    344:        including <a href="https://man.openbsd.org/bgpd.8">bgpd(8)</a>
                    345:        and <a href="https://man.openbsd.org/bgpctl.8">bgpctl(8)</a>:
                    346:        Written and maintained by Henning Brauer and Claudio Jeker,
                    347:        and also maintained by Peter Hessler.
                    348:        Imported December 17, 2003 and first released with OpenBSD 3.5.
                    349:     <li><a href="https://man.openbsd.org/dhclient.8">dhclient(8)</a>:
                    350:        Started by Ted Lemon and Elliot Poger in 1996.
                    351:        Imported January 18, 2004 and first released with OpenBSD 3.5.
                    352:        Reworked by Henning Brauer.
                    353:        Now maintained by Kenneth Westerback.
                    354:     <li><a href="https://man.openbsd.org/dhcpd.8">dhcpd(8)</a>:
                    355:        Started by Ted Lemon in 1995.
                    356:        Imported April 13, 2004 and first released with OpenBSD 3.6.
                    357:        Reworked by Henning Brauer.
                    358:        Now maintained by Kenneth Westerback.
                    359:     <li><a href="https://man.openbsd.org/hotplugd.8">hotplugd(8)</a>:
                    360:        Started by Alexander Yurchenko.
                    361:        Imported May 30, 2004 and first released with OpenBSD 3.6.
                    362:     <li><a href="http://www.openntpd.org/">OpenNTPD</a>
                    363:        including <a href="https://man.openbsd.org/ntpd.8">ntpd(8)</a>
                    364:        and <a href="https://man.openbsd.org/ntpctl.8">ntpctl(8)</a>:
                    365:        Written and maintained by Henning Brauer.
                    366:        Imported May 31, 2004 and first released with OpenBSD 3.6.
                    367:        Portable version maintained by Brent Cook.
                    368:     <li><a href="https://man.openbsd.org/dpb.1">dpb(1)</a>:
                    369:        Started by Nikolay Sturm on August 10, 2004; first available for OpenBSD 3.6.
                    370:        Rewritten and maintained by Marc Espie since August 20, 2010.
                    371:     <li><a href="https://man.openbsd.org/ospfd.8">ospfd(8)</a>,
                    372:        <a href="https://man.openbsd.org/ospfctl.8">ospfctl(8)</a>:
                    373:        Started by Esben Norby and Claudio Jeker.
                    374:        Imported January 28, 2005 and first released with OpenBSD 3.7.
                    375:     <li><a href="https://man.openbsd.org/ifstated.8">ifstated(8)</a>:
                    376:        Started by Marco Pfatschbacher and Ryan McBride.
                    377:        Imported January 23, 2004 and first released with OpenBSD 3.8.
                    378:     <li><a href="https://man.openbsd.org/bioctl.8">bioctl(8)</a>:
                    379:        Started by Marco Peereboom.
                    380:        Imported March 29, 2005 and first released with OpenBSD 3.8.
                    381:     <li><a href="https://man.openbsd.org/hostapd.8">hostapd(8)</a>:
                    382:        Written and maintained by Reyk Floeter.
                    383:        Imported May 26, 2005 and first released with OpenBSD 3.8.
                    384:     <li><a href="https://man.openbsd.org/watchdogd.8">watchdogd(8)</a>:
                    385:        Started by Marc Balmer.
                    386:        Imported August 8, 2005 and first released with OpenBSD 3.8.
                    387:     <li><a href="https://man.openbsd.org/sdiff.1">sdiff(1)</a>:
                    388:        Written by Ray Lai.
                    389:        Imported December 27, 2005 and first released with OpenBSD 3.9.
                    390:     <li><a href="https://man.openbsd.org/dvmrpd.8">dvmrpd(8)</a>,
                    391:        <a href="https://man.openbsd.org/dvmrpctl.8">dvmrpctl(8)</a>:
                    392:        Started by Esben Norby.
                    393:        Imported June 1, 2006 and first released with OpenBSD 4.0.
                    394:     <li><a href="https://man.openbsd.org/ripd.8">ripd(8)</a>,
                    395:        <a href="https://man.openbsd.org/ripctl.8">ripctl(8)</a>:
                    396:        Started by Michele Marchetto.
                    397:        Imported October 18, 2006 and first released with OpenBSD 4.1.
                    398:     <li><a href="https://man.openbsd.org/pkg-config.1">pkg-config(1)</a>:
                    399:        Started by Chris Kuethe and Marc Espie.
                    400:        Imported November 27, 2006 and first released with OpenBSD 4.1.
                    401:        Now maintained by Jasper Lievisse Adriaanse.
                    402:     <li><a href="https://man.openbsd.org/relayd.8">relayd(8)</a>
                    403:        with <a href="https://man.openbsd.org/relayctl.8">relayctl(8)</a>:
                    404:        Started by Pierre-Yves Ritschard and Reyk Floeter.
                    405:        Imported December 16, 2006 and first released with OpenBSD 4.1.
                    406:        Now maintained by Reyk Floeter and Sebastian Benoit.<br/>
                    407:     <li><a href="https://man.openbsd.org/cwm.1">cwm(1)</a>:
                    408:        Started by <a href="http://monkey.org/~marius/cwm/README">Marius
                    409:            Aamodt Eriksen</A> in 2004.
                    410:        Imported April 27, 2007 and first released with OpenBSD 4.2.
                    411:        Now maintained by Okan Demirmen.
                    412:        <a href="https://github.com/chneukirchen/cwm">Portable version</a>
                    413:        maintained by Leah Neukirchen.
                    414:     <li><a href="https://man.openbsd.org/ospf6d.8">ospf6d(8)</a>,
                    415:        <a href="https://man.openbsd.org/ospf6ctl.8">ospf6ctl(8)</a>:
                    416:        Started by Esben Norby and Claudio Jeker.
                    417:        Imported October 8, 2007 and first released with OpenBSD 4.2.
                    418:     <li><a href="https://man.openbsd.org/libtool.1">libtool(1)</a>:
                    419:        Written by Steven Mestdagh and Marc Espie.
                    420:        Imported October 28, 2007 and first available for OpenBSD 4.3.
                    421:        Now maintained by Marc Espie, Jasper Lievisse Adriaanse,
                    422:        and Antoine Jacoutot.
                    423:     <li><a href="https://man.openbsd.org/snmpd.8">snmpd(8)</a>,
                    424:        <a href="https://man.openbsd.org/snmpctl.8">snmpctl(8)</a>:
                    425:        Started by Reyk Floeter.
                    426:        Imported December 5, 2007 and first released with OpenBSD 4.3.
                    427:        Maintained by Reyk Floeter and Bret Lambert.
                    428:     <li><a href="https://man.openbsd.org/sysmerge.8">sysmerge(8)</a>:
                    429:        Written and maintained by Antoine Jacoutot,
                    430:        originally forked from mergemaster by Douglas Barton.
                    431:        Imported April 22, 2008, first released with OpenBSD 4.4.
                    432:     <li><a href="https://man.openbsd.org/ypldap.8">ypldap(8)</a>:
                    433:        Started by Pierre-Yves Ritschard.
                    434:        Imported June 26, 2008 and first released with OpenBSD 4.4.
                    435:     <li><a href="https://www.opensmtpd.org/">OpenSMTPD</a>
                    436:        including <a href="https://man.openbsd.org/smtpd.8">smtpd(8)</a>,
                    437:        <a href="https://man.openbsd.org/smtpctl.8">smtpctl(8)</a>,
                    438:        <a href="https://man.openbsd.org/makemap.8">makemap(8)</a>:
                    439:        Started by Gilles Chehade.
                    440:        Imported November 1, 2008 and first released with OpenBSD 4.6.
                    441:        Now maintained by Gilles Chehade and Eric Faurot.
                    442:     <li><a href="http://tmux.github.io/">tmux</a>,
                    443:        <a href="https://man.openbsd.org/tmux.1">tmux(1)</a>:
                    444:        Started in 2007 and maintained by Nicholas Marriott.
                    445:        Imported June 1, 2009, first released with OpenBSD 4.6.
                    446:     <li><a href="https://man.openbsd.org/ldpd.8">ldpd(8)</a>,
                    447:        <a href="https://man.openbsd.org/ldpctl.8">ldpctl(8)</a>:
                    448:        Started by Michele Marchetto.
                    449:        Imported June 1, 2009 and first released with OpenBSD 4.6.
                    450:        Now maintained by Claudio Jeker.
                    451:     <li><a href="http://mdocml.bsd.lv/">mandoc</a>
                    452:        including <a href="https://man.openbsd.org/mandoc.1">mandoc(1)</a>,
                    453:        <a href="https://man.openbsd.org/man.1">man(1)</a>,
                    454:        <a href="https://man.openbsd.org/apropos.1">apropos(1)</a>,
                    455:        <a href="https://man.openbsd.org/makewhatis.8">makewhatis(8)</a>,
                    456:        <a href="https://man.openbsd.org/man.cgi.8">man.cgi(8)</a>:
                    457:        Started by Kristaps Dzonsons in November 2008.
                    458:        Imported April 6, 2009, first released with OpenBSD 4.8.
                    459:        Now maintained by Ingo Schwarze.
                    460:     <li><a href="https://man.openbsd.org/ldapd.8">ldapd(8)</a>,
                    461:        <a href="https://man.openbsd.org/ldapctl.8">ldapctl(8)</a>:
                    462:        Written by Martin Hedenfalk.
                    463:        Imported May 31, 2010 and first released with OpenBSD 4.8.
                    464:     <li><a href="http://www.openiked.org/">OpenIKED</a>
                    465:        including <a href="https://man.openbsd.org/iked.8">iked(8)</a>
                    466:        and <a href="https://man.openbsd.org/ikectl.8">ikectl(8)</a>:
                    467:        Started by Reyk Floeter.
                    468:        Imported June 3, 2010 and first released with OpenBSD 4.8.
                    469:        Now maintained by Reyk Floeter and Mike Belopuhov.
                    470:     <li><a href="https://man.openbsd.org/iscsid.8">iscsid(8)</a>,
                    471:        <a href="https://man.openbsd.org/iscsictl.8">iscsictl(8)</a>:
                    472:        Written and maintained by Claudio Jeker.
                    473:        Imported September 24, 2010 and first released with OpenBSD 4.9.
                    474:     <li><a href="https://man.openbsd.org/rc.d.8">rc.d(8)</a>,
                    475:        <a href="https://man.openbsd.org/rc.subr.8">rc.subr(8)</a>:
                    476:        Written and maintained by Robert Nagy and Antoine Jacoutot.
                    477:        Imported October 26, 2010 and first released with OpenBSD 4.9.
                    478:     <li><a href="https://man.openbsd.org/tftpd.8">tftpd(8)</a>:
                    479:        Written and maintained by David Gwynne.
                    480:        Imported March 2, 2012 and first released with OpenBSD 5.2.
                    481:     <li><a href="https://man.openbsd.org/npppd.8">npppd(8)</a>,
                    482:        <a href="https://man.openbsd.org/npppctl.8">npppctl(8)</a>:
                    483:        Started by Internet Initiative Japan Inc.
                    484:        Imported January 11, 2010, first released with OpenBSD 5.3.
                    485:        Maintained by YASUOKA Masahiko.
                    486:     <li><a href="https://man.openbsd.org/ldomd.8">ldomd(8)</a>,
                    487:        <a href="https://man.openbsd.org/ldomctl.8">ldomctl(8)</a>:
                    488:        Written and maintained by Mark Kettenis.
                    489:        Imported October 26, 2012 and first released with OpenBSD 5.3.
                    490:     <li><a href="https://man.openbsd.org/sndiod.8">sndiod(8)</a>:
                    491:        Written and maintained by Alexandre Ratchov.
                    492:        Imported November 23, 2012 and first released with OpenBSD 5.3.
                    493:     <li><a href="https://man.openbsd.org/cu.1">cu(1)</a>:
                    494:        Written and maintained by Nicholas Marriott.
                    495:        Imported July 10, 2012 and first released with OpenBSD 5.4.
                    496:     <li><a href="https://man.openbsd.org/identd.8">identd(8)</a>:
                    497:        Written and maintained by David Gwynne.
                    498:        Imported March 18, 2013 and first released with OpenBSD 5.4.
                    499:     <li><a href="https://man.openbsd.org/slowcgi.8">slowcgi(8)</a>:
                    500:        Written and maintained by Florian Obser.
                    501:        Imported May 23, 2013 and first released with OpenBSD 5.4.
                    502:     <li><a href="https://man.openbsd.org/signify.1">signify(1)</a>:
                    503:        Written and maintained by <a href="http://www.tedunangst.com/flak/post/signify">Ted Unangst</a>.
                    504:        Imported December 31, 2013 and first released with OpenBSD 5.5.
                    505:     <li><a href="https://man.openbsd.org/htpasswd.1">htpasswd(1)</a>:
                    506:        Written and maintained by Florian Obser.
                    507:        Imported March 17, 2014 and first released with OpenBSD 5.6.
                    508:     <li><a href="https://www.libressl.org/">LibreSSL</a>:
                    509:        Started by Ted Unangst, Bob Beck, Joel Sing, Miod Vallat, Philip Guenther,
                    510:        and Theo de Raadt on April 13, 2014, as a fork of OpenSSL 1.0.1g.
                    511:        First released with OpenBSD 5.6.
                    512:        Portable version maintained by Brent Cook.
                    513:     <li><a href="https://man.openbsd.org/httpd.8">httpd(8)</a>:
                    514:        Started by Reyk Floeter.
                    515:        Imported July 12, 2014 and first released with OpenBSD 5.6.
                    516:        Maintained by Reyk Floeter and Florian Obser.
                    517:     <li><a href="https://man.openbsd.org/rcctl.8">rcctl(8)</a>:
                    518:        Written and maintained by Antoine Jacoutot.
                    519:        Imported August 19, 2014 and first released with OpenBSD 5.7.
                    520:     <li><a href="https://man.openbsd.org/file.1">file(1)</a>:
                    521:        Rewritten from scratch and maintained by Nicholas Marriott.
                    522:        Imported April 24, 2015 and first released with OpenBSD 5.8.
                    523:     <li><a href="https://man.openbsd.org/doas.1">doas(1)</a>:
                    524:        Written and maintained by Ted Unangst.
                    525:        Imported July 16, 2015 and first released with OpenBSD 5.8.
                    526:     <li><a href="https://man.openbsd.org/radiusd.8">radiusd(8)</a>:
                    527:        Written and maintained by YASUOKA Masahiko.
                    528:        Imported July 21, 2015 and first released with OpenBSD 5.8.
                    529:     <li><a href="https://man.openbsd.org/eigrpd.8">eigrpd(8)</a>,
                    530:        <a href="https://man.openbsd.org/eigrpctl.8">eigrpctl(8)</a>:
                    531:        Written and maintained by Renato Westphal.
                    532:        Imported October 2, 2015 and first released with OpenBSD 5.9.
                    533:     <li><a href="https://man.openbsd.org/rebound.8">rebound(8)</a>:
                    534:        Written and maintained by Ted Unangst.
                    535:        Imported October 15, 2015 and first released with OpenBSD 5.9.
                    536:     <li><a href="https://man.openbsd.org/vmm.4">vmm(4)</a>,
                    537:        <a href="https://man.openbsd.org/vmd.8">vmd(8)</a>,
                    538:        <a href="https://man.openbsd.org/vmctl.8">vmctl(8)</a>:
                    539:        Written and maintained by Mike Larkin and Reyk Floeter.
                    540:        Imported November 13, 2015 and first released with OpenBSD 5.9.
                    541:     <li><a href="https://man.openbsd.org/pdisk.8">pdisk(8)</a>:
                    542:        Originally written by Eryk Vershen in 1996-1998,
                    543:        rewritten and maintained by Kenneth Westerback since January 11, 2016
                    544:        and first released with OpenBSD 5.9.
                    545:     <li><a href="https://man.openbsd.org/mknod.8">mknod(8)</a>:
                    546:        Original version from Version 6 AT&amp;T UNIX (1975),
                    547:        last rewritten by Marc Espie on March 5, 2016
                    548:        and first released with OpenBSD 6.0.
                    549:     <li><a href="https://man.openbsd.org/audioctl.1">audioctl(1)</a>:
                    550:        Originally written by Lennart Augustsson in 1997,
                    551:        rewritten and maintained by Alexandre Ratchov since June 21, 2016
                    552:        and first released with OpenBSD 6.0.
                    553:     <li><a href="https://man.openbsd.org/switchd.8">switchd(8)</a>,
                    554:        <a href="https://man.openbsd.org/switchctl.8">switchctl(8)</a>:
                    555:        Written and maintained by Reyk Floeter.
                    556:        Imported July 19, 2016; released with OpenBSD 6.1.
                    557:     <li><a href="https://man.openbsd.org/acme-client.1">acme-client(1)</a>:
                    558:        Written by Kristaps Dzonsons, imported August 31, 2016; released
                    559:        with OpenBSD 6.1.
                    560:     <li><a href="https://man.openbsd.org/syspatch.8">syspatch(8)</a>:
                    561:        Written and maintained by Antoine Jacoutot.
                    562:        Imported September 5, 2016; released with OpenBSD 6.1.
                    563:     <li><a href="https://man.openbsd.org/ping.8">ping(8)</a>:
                    564:        Restructured to include IPv6 functionality and maintained by Florian Obser.
                    565:        The separate
                    566:        <a href="https://man.openbsd.org/OpenBSD-6.0/ping6.8">ping6(8)</a>
                    567:        was superseded on September 17, 2016,
                    568:        and the new, combined version was released with OpenBSD 6.1.
                    569:     <li><a href="https://man.openbsd.org/xenodm.1">xenodm(1)</a>:
                    570:        Cleaned-up fork of
                    571:        <a href="https://man.openbsd.org/OpenBSD-6.0/xdm.1">xdm(1)</a>
                    572:        maintained by Matthieu Herrb.
                    573:        Imported October 23, 2016; released with OpenBSD 6.1.
                    574:     <li><a href="https://man.openbsd.org/ocspcheck.8">ocspcheck(8)</a>:
                    575:        Written and maintained by Bob Beck.
                    576:        Imported January 24, 2017; released with OpenBSD 6.1.
                    577:     <li><a href="https://man.openbsd.org/slaacd.8">slaacd(8)</a>:
                    578:        Written and maintained by Florian Obser.
                    579:        Imported March 18, 2017; released with OpenBSD 6.2.
                    580:     <li><a href="https://man.openbsd.org/rad.8">rad(8)</a>:
                    581:        Written and maintained by Florian Obser.
                    582:        Imported July 10, 2018; released with OpenBSD 6.4.
                    583:     <li><a href="https://man.openbsd.org/unwind.8">unwind(8)</a>:
                    584:        Written and maintained by Florian Obser.
                    585:        Imported January 23, 2019; released with OpenBSD 6.5.
                    586:     <li><a href="https://man.openbsd.org/openrsync.1">openrsync(1)</a>:
                    587:        Written by Kristaps Dzonsons.
                    588:        Imported February 10, 2019; released with OpenBSD 6.5.
1.1       schwarze  589: </ul>
                    590:
1.11      deraadt   591: <h3>Projects maintained by OpenBSD developers outside OpenBSD</h3>
1.1       schwarze  592:
                    593: <ul>
1.78      deraadt   594:     <li><a href="http://www.sudo.ws/">sudo</a>:
                    595:        Started by Bob Coggeshall and Cliff Spencer around 1980.
                    596:        Imported November 18, 1999, first released with OpenBSD 2.7.
                    597:        Now maintained by Todd Miller.
                    598:     <li><a href="http://bulabula.org/femail/">femail</a>:
                    599:        Written and maintained by Henning Brauer.
                    600:        Started in 2005, port available since September 22, 2005.
                    601:     <li><a href="http://www.midish.org/">midish</a>:
                    602:        Written and maintained by Alexandre Ratchov.
                    603:        Started in 2003, port available since November 4, 2005.
                    604:     <li><a href="https://github.com/nicm/fdm">fdm</a>:
                    605:        Written and maintained by Nicholas Marriott.
                    606:        Started in 2006, port available since January 18, 2007.
                    607:     <li><a href="https://github.com/ajacoutot/toad/">toad</a>:
                    608:        Written and maintained by Antoine Jacoutot.
                    609:        Started in 2013, port available since October 8, 2013.
                    610:     <li><a href="https://mandoc.bsd.lv/docbook2mdoc/">docbook2mdoc</a>:
                    611:        Started by Kristaps Dzonsons in 2014, maintained by Ingo Schwarze.
                    612:        Port available since April 3, 2014.
                    613:     <li><a href="http://jasperla.github.io/portroach/">portroach</a>:
                    614:        Written and maintained by Jasper Lievisse Adriaanse,
                    615:        originally forked from FreeBSD's portscout.
                    616:        Started in 2014, port available since September 5, 2014.
                    617:     <li><a href="https://github.com/yasuoka/cvs2gitdump">cvs2gitdump</a>:
                    618:        Written and maintained by YASUOKA Masahiko.
                    619:        Started in 2012, port available since August 1, 2016.
1.1       schwarze  620: </ul>