Annotation of src/usr.bin/ssh/ssh_config.5, Revision 1.1
1.1 ! stevesk 1: .\" -*- nroff -*-
! 2: .\"
! 3: .\" Author: Tatu Ylonen <ylo@cs.hut.fi>
! 4: .\" Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
! 5: .\" All rights reserved
! 6: .\"
! 7: .\" As far as I am concerned, the code I have written for this software
! 8: .\" can be used freely for any purpose. Any derived versions of this
! 9: .\" software must be clearly marked as such, and if the derived work is
! 10: .\" incompatible with the protocol description in the RFC file, it must be
! 11: .\" called by a name other than "ssh" or "Secure Shell".
! 12: .\"
! 13: .\" Copyright (c) 1999,2000 Markus Friedl. All rights reserved.
! 14: .\" Copyright (c) 1999 Aaron Campbell. All rights reserved.
! 15: .\" Copyright (c) 1999 Theo de Raadt. All rights reserved.
! 16: .\"
! 17: .\" Redistribution and use in source and binary forms, with or without
! 18: .\" modification, are permitted provided that the following conditions
! 19: .\" are met:
! 20: .\" 1. Redistributions of source code must retain the above copyright
! 21: .\" notice, this list of conditions and the following disclaimer.
! 22: .\" 2. Redistributions in binary form must reproduce the above copyright
! 23: .\" notice, this list of conditions and the following disclaimer in the
! 24: .\" documentation and/or other materials provided with the distribution.
! 25: .\"
! 26: .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
! 27: .\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
! 28: .\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
! 29: .\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
! 30: .\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
! 31: .\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
! 32: .\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
! 33: .\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
! 34: .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
! 35: .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
! 36: .\"
! 37: .\" $OpenBSD: ssh.1,v 1.156 2002/06/10 17:45:20 stevesk Exp $
! 38: .Dd September 25, 1999
! 39: .Dt SSH_CONFIG 5
! 40: .Os
! 41: .Sh NAME
! 42: .Nm ssh_config
! 43: .Nd OpenSSH SSH client configuration files
! 44: .Sh SYNOPSIS
! 45: .Bl -tag -width Ds -compact
! 46: .It Pa $HOME/.ssh/config
! 47: .It Pa /etc/ssh/ssh_config
! 48: .El
! 49: .Sh DESCRIPTION
! 50: .Nm ssh
! 51: obtains configuration data from the following sources in
! 52: the following order:
! 53: command line options, user's configuration file
! 54: .Pq Pa $HOME/.ssh/config ,
! 55: and system-wide configuration file
! 56: .Pq Pa /etc/ssh/ssh_config .
! 57: .Pp
! 58: For each parameter, the first obtained value
! 59: will be used.
! 60: The configuration files contain sections bracketed by
! 61: .Dq Host
! 62: specifications, and that section is only applied for hosts that
! 63: match one of the patterns given in the specification.
! 64: The matched host name is the one given on the command line.
! 65: .Pp
! 66: Since the first obtained value for each parameter is used, more
! 67: host-specific declarations should be given near the beginning of the
! 68: file, and general defaults at the end.
! 69: .Pp
! 70: The configuration file has the following format:
! 71: .Pp
! 72: Empty lines and lines starting with
! 73: .Ql #
! 74: are comments.
! 75: .Pp
! 76: Otherwise a line is of the format
! 77: .Dq keyword arguments .
! 78: Configuration options may be separated by whitespace or
! 79: optional whitespace and exactly one
! 80: .Ql = ;
! 81: the latter format is useful to avoid the need to quote whitespace
! 82: when specifying configuration options using the
! 83: .Nm ssh ,
! 84: .Nm scp
! 85: and
! 86: .Nm sftp
! 87: .Fl o
! 88: option.
! 89: .Pp
! 90: The possible
! 91: keywords and their meanings are as follows (note that
! 92: keywords are case-insensitive and arguments are case-sensitive):
! 93: .Bl -tag -width Ds
! 94: .It Cm Host
! 95: Restricts the following declarations (up to the next
! 96: .Cm Host
! 97: keyword) to be only for those hosts that match one of the patterns
! 98: given after the keyword.
! 99: .Ql \&*
! 100: and
! 101: .Ql ?
! 102: can be used as wildcards in the
! 103: patterns.
! 104: A single
! 105: .Ql \&*
! 106: as a pattern can be used to provide global
! 107: defaults for all hosts.
! 108: The host is the
! 109: .Ar hostname
! 110: argument given on the command line (i.e., the name is not converted to
! 111: a canonicalized host name before matching).
! 112: .It Cm AFSTokenPassing
! 113: Specifies whether to pass AFS tokens to remote host.
! 114: The argument to this keyword must be
! 115: .Dq yes
! 116: or
! 117: .Dq no .
! 118: This option applies to protocol version 1 only.
! 119: .It Cm BatchMode
! 120: If set to
! 121: .Dq yes ,
! 122: passphrase/password querying will be disabled.
! 123: This option is useful in scripts and other batch jobs where no user
! 124: is present to supply the password.
! 125: The argument must be
! 126: .Dq yes
! 127: or
! 128: .Dq no .
! 129: The default is
! 130: .Dq no .
! 131: .It Cm BindAddress
! 132: Specify the interface to transmit from on machines with multiple
! 133: interfaces or aliased addresses.
! 134: Note that this option does not work if
! 135: .Cm UsePrivilegedPort
! 136: is set to
! 137: .Dq yes .
! 138: .It Cm ChallengeResponseAuthentication
! 139: Specifies whether to use challenge response authentication.
! 140: The argument to this keyword must be
! 141: .Dq yes
! 142: or
! 143: .Dq no .
! 144: The default is
! 145: .Dq yes .
! 146: .It Cm CheckHostIP
! 147: If this flag is set to
! 148: .Dq yes ,
! 149: ssh will additionally check the host IP address in the
! 150: .Pa known_hosts
! 151: file.
! 152: This allows ssh to detect if a host key changed due to DNS spoofing.
! 153: If the option is set to
! 154: .Dq no ,
! 155: the check will not be executed.
! 156: The default is
! 157: .Dq yes .
! 158: .It Cm Cipher
! 159: Specifies the cipher to use for encrypting the session
! 160: in protocol version 1.
! 161: Currently,
! 162: .Dq blowfish ,
! 163: .Dq 3des ,
! 164: and
! 165: .Dq des
! 166: are supported.
! 167: .Ar des
! 168: is only supported in the
! 169: .Nm ssh
! 170: client for interoperability with legacy protocol 1 implementations
! 171: that do not support the
! 172: .Ar 3des
! 173: cipher. Its use is strongly discouraged due to cryptographic
! 174: weaknesses.
! 175: The default is
! 176: .Dq 3des .
! 177: .It Cm Ciphers
! 178: Specifies the ciphers allowed for protocol version 2
! 179: in order of preference.
! 180: Multiple ciphers must be comma-separated.
! 181: The default is
! 182: .Pp
! 183: .Bd -literal
! 184: ``aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,
! 185: aes192-cbc,aes256-cbc''
! 186: .Ed
! 187: .It Cm ClearAllForwardings
! 188: Specifies that all local, remote and dynamic port forwardings
! 189: specified in the configuration files or on the command line be
! 190: cleared. This option is primarily useful when used from the
! 191: .Nm ssh
! 192: command line to clear port forwardings set in
! 193: configuration files, and is automatically set by
! 194: .Xr scp 1
! 195: and
! 196: .Xr sftp 1 .
! 197: The argument must be
! 198: .Dq yes
! 199: or
! 200: .Dq no .
! 201: The default is
! 202: .Dq no .
! 203: .It Cm Compression
! 204: Specifies whether to use compression.
! 205: The argument must be
! 206: .Dq yes
! 207: or
! 208: .Dq no .
! 209: The default is
! 210: .Dq no .
! 211: .It Cm CompressionLevel
! 212: Specifies the compression level to use if compression is enabled.
! 213: The argument must be an integer from 1 (fast) to 9 (slow, best).
! 214: The default level is 6, which is good for most applications.
! 215: The meaning of the values is the same as in
! 216: .Xr gzip 1 .
! 217: Note that this option applies to protocol version 1 only.
! 218: .It Cm ConnectionAttempts
! 219: Specifies the number of tries (one per second) to make before exiting.
! 220: The argument must be an integer.
! 221: This may be useful in scripts if the connection sometimes fails.
! 222: The default is 1.
! 223: .It Cm DynamicForward
! 224: Specifies that a TCP/IP port on the local machine be forwarded
! 225: over the secure channel, and the application
! 226: protocol is then used to determine where to connect to from the
! 227: remote machine. The argument must be a port number.
! 228: Currently the SOCKS4 protocol is supported, and
! 229: .Nm ssh
! 230: will act as a SOCKS4 server.
! 231: Multiple forwardings may be specified, and
! 232: additional forwardings can be given on the command line. Only
! 233: the superuser can forward privileged ports.
! 234: .It Cm EscapeChar
! 235: Sets the escape character (default:
! 236: .Ql ~ ) .
! 237: The escape character can also
! 238: be set on the command line.
! 239: The argument should be a single character,
! 240: .Ql ^
! 241: followed by a letter, or
! 242: .Dq none
! 243: to disable the escape
! 244: character entirely (making the connection transparent for binary
! 245: data).
! 246: .It Cm ForwardAgent
! 247: Specifies whether the connection to the authentication agent (if any)
! 248: will be forwarded to the remote machine.
! 249: The argument must be
! 250: .Dq yes
! 251: or
! 252: .Dq no .
! 253: The default is
! 254: .Dq no .
! 255: .It Cm ForwardX11
! 256: Specifies whether X11 connections will be automatically redirected
! 257: over the secure channel and
! 258: .Ev DISPLAY
! 259: set.
! 260: The argument must be
! 261: .Dq yes
! 262: or
! 263: .Dq no .
! 264: The default is
! 265: .Dq no .
! 266: .It Cm GatewayPorts
! 267: Specifies whether remote hosts are allowed to connect to local
! 268: forwarded ports.
! 269: By default,
! 270: .Nm ssh
! 271: binds local port forwardings to the loopback address. This
! 272: prevents other remote hosts from connecting to forwarded ports.
! 273: .Cm GatewayPorts
! 274: can be used to specify that
! 275: .Nm ssh
! 276: should bind local port forwardings to the wildcard address,
! 277: thus allowing remote hosts to connect to forwarded ports.
! 278: The argument must be
! 279: .Dq yes
! 280: or
! 281: .Dq no .
! 282: The default is
! 283: .Dq no .
! 284: .It Cm GlobalKnownHostsFile
! 285: Specifies a file to use for the global
! 286: host key database instead of
! 287: .Pa /etc/ssh/ssh_known_hosts .
! 288: .It Cm HostbasedAuthentication
! 289: Specifies whether to try rhosts based authentication with public key
! 290: authentication.
! 291: The argument must be
! 292: .Dq yes
! 293: or
! 294: .Dq no .
! 295: The default is
! 296: .Dq no .
! 297: This option applies to protocol version 2 only and
! 298: is similar to
! 299: .Cm RhostsRSAAuthentication .
! 300: .It Cm HostKeyAlgorithms
! 301: Specifies the protocol version 2 host key algorithms
! 302: that the client wants to use in order of preference.
! 303: The default for this option is:
! 304: .Dq ssh-rsa,ssh-dss .
! 305: .It Cm HostKeyAlias
! 306: Specifies an alias that should be used instead of the
! 307: real host name when looking up or saving the host key
! 308: in the host key database files.
! 309: This option is useful for tunneling ssh connections
! 310: or for multiple servers running on a single host.
! 311: .It Cm HostName
! 312: Specifies the real host name to log into.
! 313: This can be used to specify nicknames or abbreviations for hosts.
! 314: Default is the name given on the command line.
! 315: Numeric IP addresses are also permitted (both on the command line and in
! 316: .Cm HostName
! 317: specifications).
! 318: .It Cm IdentityFile
! 319: Specifies a file from which the user's RSA or DSA authentication identity
! 320: is read. The default is
! 321: .Pa $HOME/.ssh/identity
! 322: for protocol version 1, and
! 323: .Pa $HOME/.ssh/id_rsa
! 324: and
! 325: .Pa $HOME/.ssh/id_dsa
! 326: for protocol version 2.
! 327: Additionally, any identities represented by the authentication agent
! 328: will be used for authentication.
! 329: The file name may use the tilde
! 330: syntax to refer to a user's home directory.
! 331: It is possible to have
! 332: multiple identity files specified in configuration files; all these
! 333: identities will be tried in sequence.
! 334: .It Cm KeepAlive
! 335: Specifies whether the system should send TCP keepalive messages to the
! 336: other side.
! 337: If they are sent, death of the connection or crash of one
! 338: of the machines will be properly noticed.
! 339: However, this means that
! 340: connections will die if the route is down temporarily, and some people
! 341: find it annoying.
! 342: .Pp
! 343: The default is
! 344: .Dq yes
! 345: (to send keepalives), and the client will notice
! 346: if the network goes down or the remote host dies.
! 347: This is important in scripts, and many users want it too.
! 348: .Pp
! 349: To disable keepalives, the value should be set to
! 350: .Dq no .
! 351: .It Cm KerberosAuthentication
! 352: Specifies whether Kerberos authentication will be used.
! 353: The argument to this keyword must be
! 354: .Dq yes
! 355: or
! 356: .Dq no .
! 357: .It Cm KerberosTgtPassing
! 358: Specifies whether a Kerberos TGT will be forwarded to the server.
! 359: This will only work if the Kerberos server is actually an AFS kaserver.
! 360: The argument to this keyword must be
! 361: .Dq yes
! 362: or
! 363: .Dq no .
! 364: .It Cm LocalForward
! 365: Specifies that a TCP/IP port on the local machine be forwarded over
! 366: the secure channel to the specified host and port from the remote machine.
! 367: The first argument must be a port number, and the second must be
! 368: .Ar host:port .
! 369: IPv6 addresses can be specified with an alternative syntax:
! 370: .Ar host/port .
! 371: Multiple forwardings may be specified, and additional
! 372: forwardings can be given on the command line.
! 373: Only the superuser can forward privileged ports.
! 374: .It Cm LogLevel
! 375: Gives the verbosity level that is used when logging messages from
! 376: .Nm ssh .
! 377: The possible values are:
! 378: QUIET, FATAL, ERROR, INFO, VERBOSE, DEBUG, DEBUG1, DEBUG2 and DEBUG3.
! 379: The default is INFO. DEBUG and DEBUG1 are equivalent. DEBUG2
! 380: and DEBUG3 each specify higher levels of verbose output.
! 381: .It Cm MACs
! 382: Specifies the MAC (message authentication code) algorithms
! 383: in order of preference.
! 384: The MAC algorithm is used in protocol version 2
! 385: for data integrity protection.
! 386: Multiple algorithms must be comma-separated.
! 387: The default is
! 388: .Dq hmac-md5,hmac-sha1,hmac-ripemd160,hmac-sha1-96,hmac-md5-96 .
! 389: .It Cm NoHostAuthenticationForLocalhost
! 390: This option can be used if the home directory is shared across machines.
! 391: In this case localhost will refer to a different machine on each of
! 392: the machines and the user will get many warnings about changed host keys.
! 393: However, this option disables host authentication for localhost.
! 394: The argument to this keyword must be
! 395: .Dq yes
! 396: or
! 397: .Dq no .
! 398: The default is to check the host key for localhost.
! 399: .It Cm NumberOfPasswordPrompts
! 400: Specifies the number of password prompts before giving up.
! 401: The argument to this keyword must be an integer.
! 402: Default is 3.
! 403: .It Cm PasswordAuthentication
! 404: Specifies whether to use password authentication.
! 405: The argument to this keyword must be
! 406: .Dq yes
! 407: or
! 408: .Dq no .
! 409: The default is
! 410: .Dq yes .
! 411: .It Cm Port
! 412: Specifies the port number to connect on the remote host.
! 413: Default is 22.
! 414: .It Cm PreferredAuthentications
! 415: Specifies the order in which the client should try protocol 2
! 416: authentication methods. This allows a client to prefer one method (e.g.
! 417: .Cm keyboard-interactive )
! 418: over another method (e.g.
! 419: .Cm password )
! 420: The default for this option is:
! 421: .Dq hostbased,publickey,keyboard-interactive,password .
! 422: .It Cm Protocol
! 423: Specifies the protocol versions
! 424: .Nm ssh
! 425: should support in order of preference.
! 426: The possible values are
! 427: .Dq 1
! 428: and
! 429: .Dq 2 .
! 430: Multiple versions must be comma-separated.
! 431: The default is
! 432: .Dq 2,1 .
! 433: This means that
! 434: .Nm ssh
! 435: tries version 2 and falls back to version 1
! 436: if version 2 is not available.
! 437: .It Cm ProxyCommand
! 438: Specifies the command to use to connect to the server.
! 439: The command
! 440: string extends to the end of the line, and is executed with
! 441: .Pa /bin/sh .
! 442: In the command string,
! 443: .Ql %h
! 444: will be substituted by the host name to
! 445: connect and
! 446: .Ql %p
! 447: by the port.
! 448: The command can be basically anything,
! 449: and should read from its standard input and write to its standard output.
! 450: It should eventually connect an
! 451: .Xr sshd 8
! 452: server running on some machine, or execute
! 453: .Ic sshd -i
! 454: somewhere.
! 455: Host key management will be done using the
! 456: HostName of the host being connected (defaulting to the name typed by
! 457: the user).
! 458: Note that
! 459: .Cm CheckHostIP
! 460: is not available for connects with a proxy command.
! 461: .Pp
! 462: .It Cm PubkeyAuthentication
! 463: Specifies whether to try public key authentication.
! 464: The argument to this keyword must be
! 465: .Dq yes
! 466: or
! 467: .Dq no .
! 468: The default is
! 469: .Dq yes .
! 470: This option applies to protocol version 2 only.
! 471: .It Cm RemoteForward
! 472: Specifies that a TCP/IP port on the remote machine be forwarded over
! 473: the secure channel to the specified host and port from the local machine.
! 474: The first argument must be a port number, and the second must be
! 475: .Ar host:port .
! 476: IPv6 addresses can be specified with an alternative syntax:
! 477: .Ar host/port .
! 478: Multiple forwardings may be specified, and additional
! 479: forwardings can be given on the command line.
! 480: Only the superuser can forward privileged ports.
! 481: .It Cm RhostsAuthentication
! 482: Specifies whether to try rhosts based authentication.
! 483: Note that this
! 484: declaration only affects the client side and has no effect whatsoever
! 485: on security.
! 486: Most servers do not permit RhostsAuthentication because it
! 487: is not secure (see
! 488: .Cm RhostsRSAAuthentication ) .
! 489: The argument to this keyword must be
! 490: .Dq yes
! 491: or
! 492: .Dq no .
! 493: The default is
! 494: .Dq no .
! 495: This option applies to protocol version 1 only.
! 496: .It Cm RhostsRSAAuthentication
! 497: Specifies whether to try rhosts based authentication with RSA host
! 498: authentication.
! 499: The argument must be
! 500: .Dq yes
! 501: or
! 502: .Dq no .
! 503: The default is
! 504: .Dq no .
! 505: This option applies to protocol version 1 only and requires
! 506: .Nm ssh
! 507: to be setuid root.
! 508: .It Cm RSAAuthentication
! 509: Specifies whether to try RSA authentication.
! 510: The argument to this keyword must be
! 511: .Dq yes
! 512: or
! 513: .Dq no .
! 514: RSA authentication will only be
! 515: attempted if the identity file exists, or an authentication agent is
! 516: running.
! 517: The default is
! 518: .Dq yes .
! 519: Note that this option applies to protocol version 1 only.
! 520: .It Cm SmartcardDevice
! 521: Specifies which smartcard device to use. The argument to this keyword is
! 522: the device
! 523: .Nm ssh
! 524: should use to communicate with a smartcard used for storing the user's
! 525: private RSA key. By default, no device is specified and smartcard support
! 526: is not activated.
! 527: .It Cm StrictHostKeyChecking
! 528: If this flag is set to
! 529: .Dq yes ,
! 530: .Nm ssh
! 531: will never automatically add host keys to the
! 532: .Pa $HOME/.ssh/known_hosts
! 533: file, and refuses to connect to hosts whose host key has changed.
! 534: This provides maximum protection against trojan horse attacks,
! 535: however, can be annoying when the
! 536: .Pa /etc/ssh/ssh_known_hosts
! 537: file is poorly maintained, or connections to new hosts are
! 538: frequently made.
! 539: This option forces the user to manually
! 540: add all new hosts.
! 541: If this flag is set to
! 542: .Dq no ,
! 543: .Nm ssh
! 544: will automatically add new host keys to the
! 545: user known hosts files.
! 546: If this flag is set to
! 547: .Dq ask ,
! 548: new host keys
! 549: will be added to the user known host files only after the user
! 550: has confirmed that is what they really want to do, and
! 551: .Nm ssh
! 552: will refuse to connect to hosts whose host key has changed.
! 553: The host keys of
! 554: known hosts will be verified automatically in all cases.
! 555: The argument must be
! 556: .Dq yes ,
! 557: .Dq no
! 558: or
! 559: .Dq ask .
! 560: The default is
! 561: .Dq ask .
! 562: .It Cm UsePrivilegedPort
! 563: Specifies whether to use a privileged port for outgoing connections.
! 564: The argument must be
! 565: .Dq yes
! 566: or
! 567: .Dq no .
! 568: The default is
! 569: .Dq no .
! 570: Note that this option must be set to
! 571: .Dq yes
! 572: if
! 573: .Cm RhostsAuthentication
! 574: and
! 575: .Cm RhostsRSAAuthentication
! 576: authentications are needed with older servers.
! 577: .It Cm User
! 578: Specifies the user to log in as.
! 579: This can be useful when a different user name is used on different machines.
! 580: This saves the trouble of
! 581: having to remember to give the user name on the command line.
! 582: .It Cm UserKnownHostsFile
! 583: Specifies a file to use for the user
! 584: host key database instead of
! 585: .Pa $HOME/.ssh/known_hosts .
! 586: .It Cm XAuthLocation
! 587: Specifies the location of the
! 588: .Xr xauth 1
! 589: program.
! 590: The default is
! 591: .Pa /usr/X11R6/bin/xauth .
! 592: .El
! 593: .Sh FILES
! 594: .Bl -tag -width Ds
! 595: .It Pa $HOME/.ssh/config
! 596: This is the per-user configuration file.
! 597: The format of this file is described above.
! 598: This file is used by the
! 599: .Nm ssh
! 600: client.
! 601: This file does not usually contain any sensitive information,
! 602: but the recommended permissions are read/write for the user, and not
! 603: accessible by others.
! 604: .It Pa /etc/ssh/ssh_config
! 605: Systemwide configuration file.
! 606: This file provides defaults for those
! 607: values that are not specified in the user's configuration file, and
! 608: for those users who do not have a configuration file.
! 609: This file must be world-readable.
! 610: .El
! 611: .Sh AUTHORS
! 612: OpenSSH is a derivative of the original and free
! 613: ssh 1.2.12 release by Tatu Ylonen.
! 614: Aaron Campbell, Bob Beck, Markus Friedl, Niels Provos,
! 615: Theo de Raadt and Dug Song
! 616: removed many bugs, re-added newer features and
! 617: created OpenSSH.
! 618: Markus Friedl contributed the support for SSH
! 619: protocol versions 1.5 and 2.0.
! 620: .Sh SEE ALSO
! 621: .Xr ssh 1
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