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SSH Encryption - Revision history
2024-03-29T15:46:28Z
Revision history for this page on the wiki
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https://wiki.itcollege.ee/index.php?title=SSH_Encryption&diff=121627&oldid=prev
Fkorving: /* See Also */
2017-05-08T18:25:24Z
<p><span dir="auto"><span class="autocomment">See Also</span></span></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 20:25, 8 May 2017</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* The original papers on public-private key based cryptography and the RSA algorithm provide an essential starting point for further reading on the topic: [https://people.csail.mit.edu/rivest/Rsapaper.pdf "RSA"] / [https://people.csail.mit.edu/rivest/Rsapaper.pdf "New directions in Cryptography - by W. Diffie and E. Hellman"]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* The original papers on public-private key based cryptography and the RSA algorithm provide an essential starting point for further reading on the topic: [https://people.csail.mit.edu/rivest/Rsapaper.pdf "RSA"] / [https://people.csail.mit.edu/rivest/Rsapaper.pdf "New directions in Cryptography - by W. Diffie and E. Hellman"]</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* More Elliptic Curves and possible security issues: [http://blog.cr.yp.to/20140323-ecdsa.html The cr.yp.to blog]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* More Elliptic Curves and possible security issues: [http://blog.cr.yp.to/20140323-ecdsa.html The cr.yp.to blog]</div></td></tr>
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Fkorving
https://wiki.itcollege.ee/index.php?title=SSH_Encryption&diff=121625&oldid=prev
Fkorving: /* Other */
2017-05-08T18:25:09Z
<p><span dir="auto"><span class="autocomment">Other</span></span></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 20:25, 8 May 2017</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{Reflist|2}}</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{Reflist|2}}</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2" class="diff-side-added"></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">==Other==</del></div></td><td colspan="2" class="diff-side-added"></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;"> Author: Frank Korving</del></div></td><td colspan="2" class="diff-side-added"></td></tr>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Operatsioonisüsteemide administreerimine ja sidumine]]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Operatsioonisüsteemide administreerimine ja sidumine]]</div></td></tr>
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Fkorving
https://wiki.itcollege.ee/index.php?title=SSH_Encryption&diff=121623&oldid=prev
Fkorving: /* References */
2017-05-08T18:24:28Z
<p><span dir="auto"><span class="autocomment">References</span></span></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 20:24, 8 May 2017</td>
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<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">==Other==</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"> Author: Frank Korving</ins></div></td></tr>
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Fkorving
https://wiki.itcollege.ee/index.php?title=SSH_Encryption&diff=121621&oldid=prev
Fkorving: /* References */
2017-05-08T18:20:22Z
<p><span dir="auto"><span class="autocomment">References</span></span></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 20:20, 8 May 2017</td>
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<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2" class="diff-side-added"></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">by Frank Korving</del></div></td><td colspan="2" class="diff-side-added"></td></tr>
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Fkorving
https://wiki.itcollege.ee/index.php?title=SSH_Encryption&diff=121620&oldid=prev
Fkorving: /* References */
2017-05-08T18:20:11Z
<p><span dir="auto"><span class="autocomment">References</span></span></p>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{Reflist|2}}</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{Reflist|2}}</div></td></tr>
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<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">by Frank Korving</ins></div></td></tr>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Operatsioonisüsteemide administreerimine ja sidumine]]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Operatsioonisüsteemide administreerimine ja sidumine]]</div></td></tr>
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Fkorving
https://wiki.itcollege.ee/index.php?title=SSH_Encryption&diff=121611&oldid=prev
Fkorving: /* Elliptic Curve */
2017-05-08T18:10:46Z
<p><span dir="auto"><span class="autocomment">Elliptic Curve</span></span></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 20:10, 8 May 2017</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>===Elliptic Curve===</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>===Elliptic Curve===</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[File:Elliptic curves.png|300px|thumb|right|#Example|Fig.4 Elliptic curves following y^2 = x^3 + ax + b. Values 'a' and 'b' are defined.]]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[File:Elliptic curves.png|300px|thumb|right|#Example|Fig.4 Elliptic curves following y^2 = x^3 + ax + b. Values 'a' and 'b' are defined.]]</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>The level of security gained by using an implementation of RSA hinges on the factorization problem of very large numbers, elliptic curve cryptography achieves this security through the "Elliptic Curve Discrete Logarithm"-problem. To illustrate we can consider an elliptic curve of the form: y^3 = x^2 + ax +b. Figure 4 shows an elliptic curve with a range of values for 'a' and 'b' on this curve. Notice the curve where the values a = 0 and b = 0. It produces a "knot" or rather a "singular point" which disqualifies these values for a and b to be considered. Figure 5 starts illustrating how we can obtain public-private key sets by choosing two points on any given curve (A, B), drawing a line between them, determining the intersection with the original curve (C) and mirroring this point on the x-axis, producing the final point (C'). Similarly we can "add" point A and B (both have the same coordinates), take the angle of that point on the curve and produce a third point C which, again-mirrored in the x-axis, produces C'. We can rewrite this as a scalar multiplication: C = 2A. This procedure is seen in Figure 6. The "Elliptic Curve Discrete Logarithm"-problem basically states that scalar multiplication on an elliptic curve is a "one-way-function"<ref>[http://mathworld.wolfram.com/One-WayFunction.html]One way functions and the discrete logarithm problem. Retrieved 30.04.2017</ref> by way that if points A and C' are known, it is very hard to determine what the factor (in this case 2) between them is. With hard we again refer to computational time complexity <del style="font-weight: bold; text-decoration: none;">and refer to look into P-NP problems</del>. These examples work with a set of real numbers while in practice this is done with a set of integers.<ref>[http://ed25519.cr.yp.to/ed25519-20110705.pdf]Introduction of Elliptic Curve Cryptography. Retrieved 30.04.2017</ref></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The level of security gained by using an implementation of RSA hinges on the factorization problem of very large numbers, elliptic curve cryptography achieves this security through the "Elliptic Curve Discrete Logarithm"-problem. To illustrate we can consider an elliptic curve of the form: y^3 = x^2 + ax +b. Figure 4 shows an elliptic curve with a range of values for 'a' and 'b' on this curve. Notice the curve where the values a = 0 and b = 0. It produces a "knot" or rather a "singular point" which disqualifies these values for a and b to be considered. Figure 5 starts illustrating how we can obtain public-private key sets by choosing two points on any given curve (A, B), drawing a line between them, determining the intersection with the original curve (C) and mirroring this point on the x-axis, producing the final point (C'). Similarly we can "add" point A and B (both have the same coordinates), take the angle of that point on the curve and produce a third point C which, again-mirrored in the x-axis, produces C'. We can rewrite this as a scalar multiplication: C = 2A. This procedure is seen in Figure 6. The "Elliptic Curve Discrete Logarithm"-problem basically states that scalar multiplication on an elliptic curve is a "one-way-function"<ref>[http://mathworld.wolfram.com/One-WayFunction.html]One way functions and the discrete logarithm problem. Retrieved 30.04.2017</ref> by way that if points A and C' are known, it is very hard to determine what the factor (in this case 2) between them is. With hard we again refer to computational time complexity. These examples work with a set of real numbers while in practice this is done with a set of integers.<ref>[http://ed25519.cr.yp.to/ed25519-20110705.pdf]Introduction of Elliptic Curve Cryptography. Retrieved 30.04.2017</ref></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>===Diffie Hellman===</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>===Diffie Hellman===</div></td></tr>
</table>
Fkorving
https://wiki.itcollege.ee/index.php?title=SSH_Encryption&diff=121609&oldid=prev
Fkorving: /* Wrap Up */
2017-05-08T18:07:45Z
<p><span dir="auto"><span class="autocomment">Wrap Up</span></span></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 20:07, 8 May 2017</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>===Wrap Up===</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>===Wrap Up===</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Some additional keywords, considerations and other materials that were either beyond the scope of this article or were beyond the author's schedule but bear mentioning anyways.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Some additional keywords, considerations and other materials that were either beyond the scope of this article or were beyond the author's schedule but bear mentioning anyways.</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>[https://www.cyberciti.biz/tips/linux-unix-bsd-openssh-server-best-practices.html Firewalling of SSH ports / Lock users to their respective home directories / Rate limiting / Disallow Port Forwarding] [https://blog.0xbadc0de.be/archives/300 Proper agent forwarding / Avoid SSH cross-server] [https://linux-audit.com/audit-and-harden-your-ssh-configuration/ No Empty Passwords / Disable rhosts / MaxAuthTries]</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>[https://www.cyberciti.biz/tips/linux-unix-bsd-openssh-server-best-practices.html Firewalling of SSH ports / Lock users to their respective home directories / Rate limiting / Disallow Port Forwarding] [https://blog.0xbadc0de.be/archives/300 Proper agent forwarding / Avoid SSH cross-server] [https://linux-audit.com/audit-and-harden-your-ssh-configuration/ No Empty Passwords / Disable rhosts / MaxAuthTries<ins style="font-weight: bold; text-decoration: none;">] / [https://wiki.mozilla.org/Security/Guidelines/OpenSSH#Ciphers_and_algorithms_choice Ciphers and Algorithm Choices] / [http://www.linuxjournal.com/content/cipher-security-how-harden-tls-and-ssh How to harden TLS and SSH] / [https://www.digitalocean.com/community/tutorials/how-to-create-an-ssh-ca-to-validate-hosts-and-clients-with-ubuntu SSH CA for host-client validation</ins>]</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==See Also==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==See Also==</div></td></tr>
</table>
Fkorving
https://wiki.itcollege.ee/index.php?title=SSH_Encryption&diff=121608&oldid=prev
Fkorving: /* SSH-key Audits and Verification */
2017-05-08T18:04:52Z
<p><span dir="auto"><span class="autocomment">SSH-key Audits and Verification</span></span></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 20:04, 8 May 2017</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> $ ssh-keygen -l -f <file with server's public-key> -E md5</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> $ ssh-keygen -l -f <file with server's public-key> -E md5</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Of course these commands can also be used in case a service is performing a SSH Key Audit and you need to find out the hash of your own public key.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">These commands can be helpful in determining the authenticity of servers. </ins>Of course these commands can also be used in case a service is performing a SSH Key Audit and you need to find out the hash of your own public key.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>===Key Strength===</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>===Key Strength===</div></td></tr>
</table>
Fkorving
https://wiki.itcollege.ee/index.php?title=SSH_Encryption&diff=121606&oldid=prev
Fkorving: /* SSH Hardening */
2017-05-08T18:03:33Z
<p><span dir="auto"><span class="autocomment">SSH Hardening</span></span></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 20:03, 8 May 2017</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>And list all added keys (in fingerprint format) by issuing:</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>And list all added keys (in fingerprint format) by issuing:</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> $ ssh-add -l</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> $ ssh-add -l</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>The <code>ssh-add</code> command has a few other useful switches one can use like the <code>-x</code> to lock the agent with a password, <code>-X</code> to unlock it and <code>-t</code> to set a maximum lifetime of a key in the agent (measured in seconds by default. Alternative with same effect: <code>ssh-agent -t</code>).</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The <code>ssh-add</code> command has a few other useful switches one can use like the <code>-x</code> to lock the agent with a password, <code>-X</code> to unlock it and <code>-t</code> to set a maximum lifetime of a key in the agent (measured in seconds by default. Alternative with same effect: <code>ssh-agent -t</code>). <ins style="font-weight: bold; text-decoration: none;">Something that one can consider using is Keychain which is a front-end to <code>ssh-agent</code> and <code>ssh-add</code>. Some resources on that topic: [http://www.funtoo.org/Keychain Official Project Page] / [https://wiki.archlinux.org/index.php/SSH_keys#Keychain ArchLinux Keychain Subsection] / [https://wiki.gentoo.org/wiki/Keychain Basic usage]</ins></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>One wants to probably only allow known users to connect to your server through SSH. One can add users to the <code>AllowUsers</code> section in the <code>sshd_config</code> file to regulate who gets access. When users are deleted, their credentials will remain in this file though so the <code>AllowGroups</code> option provides for us. We can create a <code>ssh-user</code> group to which we can add members which will loose access after deletion. Go to the <code>/etc/ssh/sshd_config</code> file and add:<ref>[https://stribika.github.io/2015/01/04/secure-secure-shell.html]Secure Secure Shell. Retrieved 08.05.2017</ref></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>One wants to probably only allow known users to connect to your server through SSH. One can add users to the <code>AllowUsers</code> section in the <code>sshd_config</code> file to regulate who gets access. When users are deleted, their credentials will remain in this file though so the <code>AllowGroups</code> option provides for us. We can create a <code>ssh-user</code> group to which we can add members which will loose access after deletion. Go to the <code>/etc/ssh/sshd_config</code> file and add:<ref>[https://stribika.github.io/2015/01/04/secure-secure-shell.html]Secure Secure Shell. Retrieved 08.05.2017</ref></div></td></tr>
</table>
Fkorving
https://wiki.itcollege.ee/index.php?title=SSH_Encryption&diff=121604&oldid=prev
Fkorving: /* Two Factor Authentication */
2017-05-08T17:58:40Z
<p><span dir="auto"><span class="autocomment">Two Factor Authentication</span></span></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 19:58, 8 May 2017</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> ChallengeResponseAuthentication yes</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> ChallengeResponseAuthentication yes</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> AuthenticationMethods publickey,keyboard-interactive:pam</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> AuthenticationMethods publickey,keyboard-interactive:pam</div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Before restarting your SSH Daemon it is wise to test any new configurations using the <code>-t</code> (Test mode) and <code>-T</code> (Extended test mode) switches. These commands should not return any errors or text.<ref>[https://linux-audit.com/audit-and-harden-your-ssh-configuration/ Audit and harden your SSH configuration. Retrieved 08.05.2017]</ref></ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"> $ sshd [-t] [-T]</ins></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> $ service sshd restart</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> $ service sshd restart</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>To use the yubikey in combination with ssh see the following tutorials / walkthroughs and reference materials: [https://github.com/drduh/YubiKey-Guide Yubikey-Guide] / [https://www.jfry.me/articles/2015/gpg-smartcard/#extracting-your-ssh-public-key GPG in smart-cards] / [https://askubuntu.com/questions/635266/use-of-yubikey-neo-for-login-2fa-and-lock-screen Ubuntu Forum - Yubikey Neo for login] / [https://lauri.xn--vsandi-pxa.com/2017/03/yubikey-for-ssh-auth.html Yubikey for SSH / HTTPS Athentication tokens] / [https://lauri.xn--vsandi-pxa.com/2017/03/yubikey-for-gpg.html Yubikey as hardware token for GPG]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>To use the yubikey in combination with ssh see the following tutorials / walkthroughs and reference materials: [https://github.com/drduh/YubiKey-Guide Yubikey-Guide] / [https://www.jfry.me/articles/2015/gpg-smartcard/#extracting-your-ssh-public-key GPG in smart-cards] / [https://askubuntu.com/questions/635266/use-of-yubikey-neo-for-login-2fa-and-lock-screen Ubuntu Forum - Yubikey Neo for login] / [https://lauri.xn--vsandi-pxa.com/2017/03/yubikey-for-ssh-auth.html Yubikey for SSH / HTTPS Athentication tokens] / [https://lauri.xn--vsandi-pxa.com/2017/03/yubikey-for-gpg.html Yubikey as hardware token for GPG]</div></td></tr>
</table>
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