1<!doctype refentry PUBLIC "-//OASIS//DTD DocBook V4.1//EN"> 2 3<refentry> 4 <refentryinfo> 5 <date>07 August 2019</date> 6 </refentryinfo> 7 8 <refmeta> 9 <refentrytitle>wpa_supplicant</refentrytitle> 10 <manvolnum>8</manvolnum> 11 </refmeta> 12 <refnamediv> 13 <refname>wpa_supplicant</refname> 14 <refpurpose>Wi-Fi Protected Access client and IEEE 802.1X supplicant</refpurpose> 15 </refnamediv> 16 <refsynopsisdiv> 17 <cmdsynopsis> 18 <command>wpa_supplicant</command> 19 <arg>-BddfhKLqqsTtuvW</arg> 20 <arg>-i<replaceable>ifname</replaceable></arg> 21 <arg>-c<replaceable>config file</replaceable></arg> 22 <arg>-D<replaceable>driver</replaceable></arg> 23 <arg>-P<replaceable>PID_file</replaceable></arg> 24 <arg>-f<replaceable>output file</replaceable></arg> 25 </cmdsynopsis> 26 </refsynopsisdiv> 27 <refsect1> 28 <title>Overview</title> 29 30 <para> 31 Wireless networks do not require physical access to the network equipment 32 in the same way as wired networks. This makes it easier for unauthorized 33 users to passively monitor a network and capture all transmitted frames. 34 In addition, unauthorized use of the network is much easier. In many cases, 35 this can happen even without user's explicit knowledge since the wireless 36 LAN adapter may have been configured to automatically join any available 37 network. 38 </para> 39 40 <para> 41 Link-layer encryption can be used to provide a layer of security for 42 wireless networks. The original wireless LAN standard, IEEE 802.11, 43 included a simple encryption mechanism, WEP. However, that proved to 44 be flawed in many areas and network protected with WEP cannot be consider 45 secure. IEEE 802.1X authentication and frequently changed dynamic WEP keys 46 can be used to improve the network security, but even that has inherited 47 security issues due to the use of WEP for encryption. Wi-Fi Protected 48 Access and IEEE 802.11i amendment to the wireless LAN standard introduce 49 a much improvement mechanism for securing wireless networks. IEEE 802.11i 50 enabled networks that are using CCMP (encryption mechanism based on strong 51 cryptographic algorithm AES) can finally be called secure used for 52 applications which require efficient protection against unauthorized 53 access. 54 </para> 55 56 <para><command>wpa_supplicant</command> is an implementation of 57 the WPA Supplicant component, i.e., the part that runs in the 58 client stations. It implements WPA key negotiation with a WPA 59 Authenticator and EAP authentication with Authentication 60 Server. In addition, it controls the roaming and IEEE 802.11 61 authentication/association of the wireless LAN driver.</para> 62 63 <para><command>wpa_supplicant</command> is designed to be a 64 "daemon" program that runs in the background and acts as the 65 backend component controlling the wireless 66 connection. <command>wpa_supplicant</command> supports separate 67 frontend programs and an example text-based frontend, 68 <command>wpa_cli</command>, is included with 69 wpa_supplicant.</para> 70 71 <para>Before wpa_supplicant can do its work, the network interface 72 must be available. That means that the physical device must be 73 present and enabled, and the driver for the device must be 74 loaded. The daemon will exit immediately if the device is not already 75 available.</para> 76 77 <para>After <command>wpa_supplicant</command> has configured the 78 network device, higher level configuration such as DHCP may 79 proceed. There are a variety of ways to integrate wpa_supplicant 80 into a machine's networking scripts, a few of which are described 81 in sections below.</para> 82 83 <para>The following steps are used when associating with an AP 84 using WPA:</para> 85 86 <itemizedlist> 87 <listitem> 88 <para><command>wpa_supplicant</command> requests the kernel 89 driver to scan neighboring BSSes</para> 90 </listitem> 91 92 <listitem> 93 <para><command>wpa_supplicant</command> selects a BSS based on 94 its configuration</para> 95 </listitem> 96 97 <listitem> 98 <para><command>wpa_supplicant</command> requests the kernel 99 driver to associate with the chosen BSS</para> 100 </listitem> 101 102 <listitem> 103 <para>If WPA-EAP: integrated IEEE 802.1X Supplicant 104 completes EAP authentication with the 105 authentication server (proxied by the Authenticator in the 106 AP)</para> 107 </listitem> 108 109 <listitem> 110 <para>If WPA-EAP: master key is received from the IEEE 802.1X 111 Supplicant</para> 112 </listitem> 113 114 <listitem> 115 <para>If WPA-PSK: <command>wpa_supplicant</command> uses PSK 116 as the master session key</para> 117 </listitem> 118 119 <listitem> 120 <para><command>wpa_supplicant</command> completes WPA 4-Way 121 Handshake and Group Key Handshake with the Authenticator 122 (AP)</para> 123 </listitem> 124 125 <listitem> 126 <para><command>wpa_supplicant</command> configures encryption 127 keys for unicast and broadcast</para> 128 </listitem> 129 130 <listitem> 131 <para>normal data packets can be transmitted and received</para> 132 </listitem> 133 </itemizedlist> 134 </refsect1> 135 136 <refsect1> 137 <title>Supported Features</title> 138 <para>Supported WPA/IEEE 802.11i features:</para> 139 <itemizedlist> 140 <listitem> 141 <para>WPA-PSK ("WPA-Personal")</para> 142 </listitem> 143 144 <listitem> 145 <para>WPA with EAP (e.g., with RADIUS authentication server) 146 ("WPA-Enterprise") Following authentication methods are 147 supported with an integrate IEEE 802.1X Supplicant:</para> 148 149 <itemizedlist> 150 <listitem> 151 <para>EAP-TLS</para> 152 </listitem> 153 </itemizedlist> 154 155 <itemizedlist> 156 <listitem> 157 <para>EAP-PEAP/MSCHAPv2 (both PEAPv0 and PEAPv1)</para> 158 </listitem> 159 160 161 <listitem> 162 <para>EAP-PEAP/TLS (both PEAPv0 and PEAPv1)</para> 163 </listitem> 164 165 <listitem> 166 <para>EAP-PEAP/GTC (both PEAPv0 and PEAPv1)</para> 167 </listitem> 168 169 <listitem> 170 <para>EAP-PEAP/OTP (both PEAPv0 and PEAPv1)</para> 171 </listitem> 172 173 <listitem> 174 <para>EAP-PEAP/MD5-Challenge (both PEAPv0 and PEAPv1)</para> 175 </listitem> 176 177 <listitem> 178 <para>EAP-TTLS/EAP-MD5-Challenge</para> 179 </listitem> 180 181 <listitem> 182 <para>EAP-TTLS/EAP-GTC</para> 183 </listitem> 184 185 <listitem><para>EAP-TTLS/EAP-OTP</para></listitem> 186 187 <listitem><para>EAP-TTLS/EAP-MSCHAPv2</para></listitem> 188 189 <listitem><para>EAP-TTLS/EAP-TLS</para></listitem> 190 191 <listitem><para>EAP-TTLS/MSCHAPv2</para></listitem> 192 193 <listitem><para>EAP-TTLS/MSCHAP</para></listitem> 194 195 <listitem><para>EAP-TTLS/PAP</para></listitem> 196 197 <listitem><para>EAP-TTLS/CHAP</para></listitem> 198 199 <listitem><para>EAP-SIM</para></listitem> 200 201 <listitem><para>EAP-AKA</para></listitem> 202 203 <listitem><para>EAP-PSK</para></listitem> 204 205 <listitem><para>EAP-PAX</para></listitem> 206 207 <listitem><para>LEAP (note: requires special support from 208 the driver for IEEE 802.11 authentication)</para></listitem> 209 210 <listitem><para>(following methods are supported, but since 211 they do not generate keying material, they cannot be used 212 with WPA or IEEE 802.1X WEP keying)</para></listitem> 213 214 <listitem><para>EAP-MD5-Challenge </para></listitem> 215 216 <listitem><para>EAP-MSCHAPv2</para></listitem> 217 218 <listitem><para>EAP-GTC</para></listitem> 219 220 <listitem><para>EAP-OTP</para></listitem> 221 </itemizedlist> 222 </listitem> 223 224 <listitem> 225 <para>key management for CCMP, TKIP, WEP104, WEP40</para> 226 </listitem> 227 228 <listitem> 229 <para>RSN/WPA2 (IEEE 802.11i)</para> 230 <itemizedlist> 231 <listitem> 232 <para>pre-authentication</para> 233 </listitem> 234 235 <listitem> 236 <para>PMKSA caching</para> 237 </listitem> 238 </itemizedlist> 239 </listitem> 240 </itemizedlist> 241 </refsect1> 242 243 <refsect1> 244 <title>Available Drivers</title> 245 <para>A summary of available driver backends is below. Support for each 246 of the driver backends is chosen at wpa_supplicant compile time. For a 247 list of supported driver backends that may be used with the -D option on 248 your system, refer to the help output of wpa_supplicant 249 (<emphasis>wpa_supplicant -h</emphasis>).</para> 250 251 <variablelist> 252 <varlistentry> 253 <term>nl80211</term> 254 <listitem> 255 <para>Uses the modern Linux nl80211/cfg80211 netlink-based 256 interface (most new drivers).</para> 257 </listitem> 258 </varlistentry> 259 260 <varlistentry> 261 <term>wext</term> 262 <listitem> 263 <para>Uses the legacy Linux wireless extensions ioctl-based 264 interface (older hardware/drivers).</para> 265 </listitem> 266 </varlistentry> 267 268 <varlistentry> 269 <term>wired</term> 270 <listitem> 271 <para>wpa_supplicant wired Ethernet driver</para> 272 </listitem> 273 </varlistentry> 274 275 <varlistentry> 276 <term>roboswitch</term> 277 <listitem> 278 <para>wpa_supplicant Broadcom switch driver</para> 279 </listitem> 280 </varlistentry> 281 282 <varlistentry> 283 <term>bsd</term> 284 <listitem> 285 <para>BSD 802.11 support (Atheros, etc.).</para> 286 </listitem> 287 </varlistentry> 288 289 <varlistentry> 290 <term>ndis</term> 291 <listitem> 292 <para>Windows NDIS driver.</para> 293 </listitem> 294 </varlistentry> 295 </variablelist> 296 </refsect1> 297 298 <refsect1> 299 <title>Command Line Options</title> 300 <para>Most command line options have global scope. Some are given per 301 interface, and are only valid if at least one <option>-i</option> option 302 is specified, otherwise they're ignored. Option groups for different 303 interfaces must be separated by <option>-N</option> option.</para> 304 <variablelist> 305 <varlistentry> 306 <term>-b br_ifname</term> 307 <listitem> 308 <para>Optional bridge interface name. (Per interface)</para> 309 </listitem> 310 </varlistentry> 311 312 <varlistentry> 313 <term>-B</term> 314 <listitem> 315 <para>Run daemon in the background.</para> 316 </listitem> 317 </varlistentry> 318 319 <varlistentry> 320 <term>-c filename</term> 321 <listitem> 322 <para>Path to configuration file. (Per interface)</para> 323 </listitem> 324 </varlistentry> 325 326 <varlistentry> 327 <term>-C ctrl_interface</term> 328 <listitem> 329 <para>Path to ctrl_interface socket (Per interface. Only used if 330 <option>-c</option> is not).</para> 331 </listitem> 332 </varlistentry> 333 334 <varlistentry> 335 <term>-i ifname</term> 336 <listitem> 337 <para>Interface to listen on. Multiple instances of this option can 338 be present, one per interface, separated by <option>-N</option> 339 option (see below).</para> 340 </listitem> 341 </varlistentry> 342 343 <varlistentry> 344 <term>-d</term> 345 <listitem> 346 <para>Increase debugging verbosity (<option>-dd</option> even 347 more).</para> 348 </listitem> 349 </varlistentry> 350 351 <varlistentry> 352 <term>-D driver</term> 353 <listitem> 354 <para>Driver to use (can be multiple drivers: nl80211,wext). 355 (Per interface, see the available options below.)</para> 356 </listitem> 357 </varlistentry> 358 359 <varlistentry> 360 <term>-e entropy file</term> 361 <listitem> 362 <para>File for <command>wpa_supplicant</command> to use to 363 maintain its internal entropy store in over restarts.</para> 364 </listitem> 365 </varlistentry> 366 367 <varlistentry> 368 <term>-f output file</term> 369 <listitem> 370 <para>Log output to specified file instead of stdout. (This 371 is only available if <command>wpa_supplicant</command> was 372 built with the <literal>CONFIG_DEBUG_FILE</literal> 373 option.)</para> 374 </listitem> 375 </varlistentry> 376 377 <varlistentry> 378 <term>-g global ctrl_interface</term> 379 <listitem> 380 <para>Path to global ctrl_interface socket. If specified, interface 381 definitions may be omitted.</para> 382 </listitem> 383 </varlistentry> 384 385 <varlistentry> 386 <term>-K</term> 387 <listitem> 388 <para>Include keys (passwords, etc.) in debug output.</para> 389 </listitem> 390 </varlistentry> 391 392 <varlistentry> 393 <term>-h</term> 394 <listitem> 395 <para>Help. Show a usage message.</para> 396 </listitem> 397 </varlistentry> 398 399 <varlistentry> 400 <term>-L</term> 401 <listitem> 402 <para>Show license (BSD).</para> 403 </listitem> 404 </varlistentry> 405 406 <varlistentry> 407 <term>-o override driver</term> 408 <listitem> 409 <para>Override the driver parameter for new 410 interfaces.</para> 411 </listitem> 412 </varlistentry> 413 414 <varlistentry> 415 <term>-O override ctrl_interface</term> 416 <listitem> 417 <para>Override the ctrl_interface parameter for new 418 interfaces.</para> 419 </listitem> 420 </varlistentry> 421 422 <varlistentry> 423 <term>-p</term> 424 <listitem> 425 <para>Driver parameters. (Per interface)</para> 426 </listitem> 427 </varlistentry> 428 429 <varlistentry> 430 <term>-P PID_file</term> 431 <listitem> 432 <para>Path to PID file.</para> 433 </listitem> 434 </varlistentry> 435 436 <varlistentry> 437 <term>-q</term> 438 <listitem> 439 <para>Decrease debugging verbosity (<option>-qq</option> even 440 less).</para> 441 </listitem> 442 </varlistentry> 443 444 <varlistentry> 445 <term>-s</term> 446 <listitem> 447 <para>Log output to syslog instead of stdout. (This is only 448 available if <command>wpa_supplicant</command> was built 449 with the <literal>CONFIG_DEBUG_SYSLOG</literal> 450 option.)</para> 451 </listitem> 452 </varlistentry> 453 454 <varlistentry> 455 <term>-T</term> 456 <listitem> 457 <para>Log output to Linux tracing in addition to any other 458 destinations. (This is only available 459 if <command>wpa_supplicant</command> was built with 460 the <literal>CONFIG_DEBUG_LINUX_TRACING</literal> 461 option.)</para> 462 </listitem> 463 </varlistentry> 464 465 <varlistentry> 466 <term>-t</term> 467 <listitem> 468 <para>Include timestamp in debug messages.</para> 469 </listitem> 470 </varlistentry> 471 472 <varlistentry> 473 <term>-u</term> 474 <listitem> 475 <para>Enable DBus control interface. If enabled, interface 476 definitions may be omitted. (This is only available 477 if <command>wpa_supplicant</command> was built with 478 the <literal>CONFIG_CTRL_IFACE_DBUS_NEW</literal> option.)</para> 479 </listitem> 480 </varlistentry> 481 482 <varlistentry> 483 <term>-v</term> 484 <listitem> 485 <para>Show version.</para> 486 </listitem> 487 </varlistentry> 488 489 <varlistentry> 490 <term>-W</term> 491 <listitem> 492 <para>Wait for a control interface monitor before starting.</para> 493 </listitem> 494 </varlistentry> 495 496 <varlistentry> 497 <term>-N</term> 498 <listitem> 499 <para>Start describing new interface.</para> 500 </listitem> 501 </varlistentry> 502 </variablelist> 503 </refsect1> 504 505 <refsect1> 506 <title>Examples</title> 507 508 <para>In most common cases, <command>wpa_supplicant</command> is 509 started with:</para> 510 511<blockquote><programlisting> 512wpa_supplicant -B -c/etc/wpa_supplicant.conf -iwlan0 513</programlisting></blockquote> 514 515 <para>This makes the process fork into background.</para> 516 517 <para>The easiest way to debug problems, and to get debug log for 518 bug reports, is to start <command>wpa_supplicant</command> on 519 foreground with debugging enabled:</para> 520 521<blockquote><programlisting> 522wpa_supplicant -c/etc/wpa_supplicant.conf -iwlan0 -d 523</programlisting></blockquote> 524 525 <para>If the specific driver wrapper is not known beforehand, it is 526 possible to specify multiple comma separated driver wrappers on the command 527 line. <command>wpa_supplicant</command> will use the first driver 528 wrapper that is able to initialize the interface.</para> 529 530<blockquote><programlisting> 531wpa_supplicant -Dnl80211,wext -c/etc/wpa_supplicant.conf -iwlan0 532</programlisting></blockquote> 533 534 <para><command>wpa_supplicant</command> can control multiple 535 interfaces (radios) either by running one process for each 536 interface separately or by running just one process and list of 537 options at command line. Each interface is separated with -N 538 argument. As an example, following command would start 539 wpa_supplicant for two interfaces:</para> 540 541<blockquote><programlisting> 542wpa_supplicant \ 543 -c wpa1.conf -i wlan0 -D nl80211 -N \ 544 -c wpa2.conf -i ath0 -D wext 545</programlisting></blockquote> 546 </refsect1> 547 548 <refsect1> 549 <title>OS Requirements</title> 550 <para>Current hardware/software requirements:</para> 551 552 <itemizedlist> 553 <listitem> 554 <para>Linux kernel 2.6.30 or higher with 555 nl80211/cfg80211 support</para> 556 </listitem> 557 558 <listitem> 559 <para>Linux kernel 2.4.x or higher with Linux Wireless 560 Extensions v15 or newer</para> 561 </listitem> 562 563 <listitem> 564 <para>FreeBSD 6-CURRENT</para> 565 </listitem> 566 567 <listitem> 568 <para>Microsoft Windows with WinPcap (at least WinXP, may work 569 with other versions)</para> 570 </listitem> 571 </itemizedlist> 572 </refsect1> 573 574 <refsect1> 575 <title>Supported Drivers</title> 576 <variablelist> 577 <varlistentry> 578 <term>Linux nl80211/cfg80211</term> 579 <listitem> 580 <para>This is the preferred driver for Linux.</para> 581 </listitem> 582 </varlistentry> 583 584 <varlistentry> 585 <term>Linux wireless extensions</term> 586 <listitem> 587 <para>In theory, any driver that supports Linux wireless 588 extensions can be used with IEEE 802.1X (i.e., not WPA) when 589 using ap_scan=0 option in configuration file.</para> 590 </listitem> 591 </varlistentry> 592 593 <varlistentry> 594 <term>Wired Ethernet drivers</term> 595 <listitem> 596 <para>Use ap_scan=0.</para> 597 </listitem> 598 </varlistentry> 599 600 <varlistentry> 601 <term>BSD net80211 layer (e.g., Atheros driver)</term> 602 <listitem> 603 <para>At the moment, this is for FreeBSD 6-CURRENT branch.</para> 604 </listitem> 605 </varlistentry> 606 607 <varlistentry> 608 <term>Windows NDIS</term> 609 <listitem> 610 <para>The current Windows port requires WinPcap 611 (http://winpcap.polito.it/). See README-Windows.txt for more 612 information.</para> 613 </listitem> 614 </varlistentry> 615 </variablelist> 616 617 618 <para>wpa_supplicant was designed to be portable for different 619 drivers and operating systems. Hopefully, support for more wlan 620 cards and OSes will be added in the future. See developer.txt for 621 more information about the design of wpa_supplicant and porting to 622 other drivers. One main goal is to add full WPA/WPA2 support to 623 Linux wireless extensions to allow new drivers to be supported 624 without having to implement new driver-specific interface code in 625 wpa_supplicant.</para> 626 </refsect1> 627 628 <refsect1> 629 <title>Architecture</title> <para>The 630 <command>wpa_supplicant</command> system consists of the following 631 components:</para> 632 633 <variablelist> 634 <varlistentry> 635 <term><filename>wpa_supplicant.conf</filename> </term> 636 <listitem> 637 <para>the configuration file describing all networks that the 638 user wants the computer to connect to. </para> 639 </listitem> 640 </varlistentry> 641 <varlistentry> 642 <term><command>wpa_supplicant</command></term> 643 <listitem><para>the program that directly interacts with the 644 network interface. </para></listitem> 645 </varlistentry> 646 <varlistentry> 647 <term><command>wpa_cli</command></term> <listitem><para> the 648 client program that provides a high-level interface to the 649 functionality of the daemon. </para></listitem> 650 </varlistentry> 651 <varlistentry> 652 <term><command>wpa_passphrase</command></term> 653 <listitem><para>a utility needed to construct 654 <filename>wpa_supplicant.conf</filename> files that include 655 encrypted passwords.</para></listitem> 656 </varlistentry> 657 </variablelist> 658 </refsect1> 659 660 <refsect1> 661 <title>Quick Start</title> 662 663 <para>First, make a configuration file, e.g. 664 <filename>/etc/wpa_supplicant.conf</filename>, that describes the networks 665 you are interested in. See <citerefentry> 666 <refentrytitle>wpa_supplicant.conf</refentrytitle> 667 <manvolnum>5</manvolnum> 668 </citerefentry> 669 for details.</para> 670 671 <para>Once the configuration is ready, you can test whether the 672 configuration works by running <command>wpa_supplicant</command> 673 with following command to start it on foreground with debugging 674 enabled:</para> 675 676 <blockquote><programlisting> 677wpa_supplicant -iwlan0 -c/etc/wpa_supplicant.conf -d 678 </programlisting></blockquote> 679 680 <para>Assuming everything goes fine, you can start using following 681 command to start <command>wpa_supplicant</command> on background 682 without debugging:</para> 683 684 <blockquote><programlisting> 685wpa_supplicant -iwlan0 -c/etc/wpa_supplicant.conf -B 686 </programlisting></blockquote> 687 688 <para>Please note that if you included more than one driver 689 interface in the build time configuration (.config), you may need 690 to specify which interface to use by including -D<driver 691 name> option on the command line.</para> 692 693 <!-- XXX at this point, the page could include a little script 694 based on wpa_cli to wait for a connection and then run 695 dhclient --> 696 697 </refsect1> 698 699 <refsect1> 700 <title>Interface to pcmcia-cs/cardmrg</title> 701 702 <para>For example, following small changes to pcmcia-cs scripts 703 can be used to enable WPA support:</para> 704 705 <para>Add MODE="Managed" and WPA="y" to the network scheme in 706 <filename>/etc/pcmcia/wireless.opts</filename>.</para> 707 708 <para>Add the following block to the end of <emphasis>start</emphasis> 709 action handler in <filename>/etc/pcmcia/wireless</filename>:</para> 710 711 <blockquote><programlisting> 712if [ "$WPA" = "y" -a -x /usr/local/bin/wpa_supplicant ]; then 713 /usr/local/bin/wpa_supplicant -B -c/etc/wpa_supplicant.conf -i$DEVICE 714fi 715 </programlisting></blockquote> 716 717 718 <para>Add the following block to the end of <emphasis>stop</emphasis> 719 action handler (may need to be separated from other actions) in 720 <filename>/etc/pcmcia/wireless</filename>:</para> 721 722 <blockquote><programlisting> 723if [ "$WPA" = "y" -a -x /usr/local/bin/wpa_supplicant ]; then 724 killall wpa_supplicant 725fi 726 </programlisting></blockquote> 727 728 <para>This will make <command>cardmgr</command> start 729 <command>wpa_supplicant</command> when the card is plugged 730 in.</para> 731 </refsect1> 732 733 <refsect1> 734 <title>See Also</title> 735 <para> 736 <citerefentry> 737 <refentrytitle>wpa_background</refentrytitle> 738 <manvolnum>8</manvolnum> 739 </citerefentry> 740 <citerefentry> 741 <refentrytitle>wpa_supplicant.conf</refentrytitle> 742 <manvolnum>5</manvolnum> 743 </citerefentry> 744 <citerefentry> 745 <refentrytitle>wpa_cli</refentrytitle> 746 <manvolnum>8</manvolnum> 747 </citerefentry> 748 <citerefentry> 749 <refentrytitle>wpa_passphrase</refentrytitle> 750 <manvolnum>8</manvolnum> 751 </citerefentry> 752 </para> 753 </refsect1> 754 <refsect1> 755 <title>Legal</title> 756 <para>wpa_supplicant is copyright (c) 2003-2019, 757 Jouni Malinen <email>j@w1.fi</email> and 758 contributors. 759 All Rights Reserved.</para> 760 761 <para>This program is licensed under the BSD license (the one with 762 advertisement clause removed).</para> 763 </refsect1> 764</refentry> 765