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annotate dropbearconvert.1 @ 1861:2b3a8026a6ce

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Add re-exec for server This allows ASLR to re-randomize the address space for every connection, preventing some vulnerabilities from being exploitable by repeated probing. Overhead (memory and time) is yet to be confirmed. At present this is only enabled on Linux. Other BSD platforms with fexecve() would probably also work though have not been tested.
author Matt Johnston <matt@ucc.asn.au>
date Sun, 30 Jan 2022 10:14:56 +0800
parents 80cacacfec23
children 863f31b4cf3c
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1 .TH dropbearconvert 1
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2 .SH NAME
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3 dropbearconvert \- convert between Dropbear and OpenSSH private key formats
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4 .SH SYNOPSIS
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5 .B dropbearconvert
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6 .I input_type
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7 .I output_type
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8 .I input_file
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9 .I output_file
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10 .SH DESCRIPTION
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11 .B Dropbear
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12 and
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13 .B OpenSSH
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14 SSH implementations have different private key formats.
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15 .B dropbearconvert
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16 can convert between the two.
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17 .P
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18 Dropbear uses the same SSH public key format as OpenSSH, it can be extracted
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19 from a private key by using
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20 .B dropbearkey \-y
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21 .P
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22 Encrypted private keys are not supported, use ssh-keygen(1) to decrypt them
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23 first.
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24 .SH ARGUMENTS
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25 .TP
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26 .I input_type
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27 Either
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28 .I dropbear
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29 or
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30 .I openssh
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31 .TP
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32 .I output_type
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33 Either
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34 .I dropbear
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35 or
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36 .I openssh
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37 .TP
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38 .I input_file
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39 An existing Dropbear or OpenSSH private key file
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40 .TP
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41 .I output_file
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42 The path to write the converted private key file. For client authentication ~/.ssh/id_dropbear is loaded by default
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43 .SH EXAMPLE
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44 # dropbearconvert openssh dropbear ~/.ssh/id_rsa ~/.ssh/id_dropbear
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45 .SH AUTHOR
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46 Matt Johnston ([email protected]).
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47 .SH SEE ALSO
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48 dropbearkey(1), ssh-keygen(1)
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49 .P
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50 https://matt.ucc.asn.au/dropbear/dropbear.html