Revision of gist:09b74c337787477ab289e39eaf4709d7

Jan Wagner revised this gist 3 years ago. Go to revision

1 file changed, 122 deletions

ssh.md (file deleted)

		@@ -1,122 +0,0 @@
1	-	# Agent Forwarding
2	-
3	-	Adding and removing keys to the agent:
4	-	```
5	-	waja at Brotschneidemaschine in ~
6	-	$ eval "$(ssh-agent -s)"
7	-	Agent pid 7715
8	-
9	-	waja at Brotschneidemaschine in ~
10	-	$ ssh-add -L
11	-	The agent has no identities.
12	-
13	-	waja at Brotschneidemaschine in ~
14	-	$ ssh-add ~/.ssh/id_rsa
15	-	Identity added: /Users/waja/.ssh/id_rsa (waja@Brotschneidemaschine.local)
16	-
17	-	waja at Brotschneidemaschine in ~
18	-	$ ssh-add -L
19	-	ssh-rsa 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 waja@Brotschneidemaschine.local
20	-
21	-	waja at Brotschneidemaschine in ~
22	-	$ tail -2 .ssh/config
23	-	Host *
24	-	ForwardAgent yes
25	-
26	-	waja at Brotschneidemaschine in ~
27	-	$ ssh-add -d ~/.ssh/id_rsa
28	-	Identity removed: /Users/waja/.ssh/id_rsa RSA (waja@Brotschneidemaschine.local)
29	-	```
30	-	Identities are not permanent, maybe use something like `echo 'AddKeysToAgent yes' >> ~/.ssh/config`.
31	-	```
32	-	waja in 🌐 jumphost in ~
33	-	✦ ❯ kill -9 7715
34	-
35	-	waja in 🌐 jumphost in ~
36	-	✦ ❯ ssh-add -L
37	-	Error connecting to agent: Connection refused
38	-
39	-	waja in 🌐 jumphost in ~
40	-	✦ ❯ eval "$(ssh-agent -s)"
41	-	Agent pid 7795
42	-
43	-	waja in 🌐 jumphost in ~
44	-	✦ ❯ ssh-add -L
45	-	The agent has no identities.
46	-	```
47	-
48	-	You can [start](https://unix.stackexchange.com/a/390631) `ssh-agent` even via `systemd`.
49	-
50	-	## SSH Agent forwarding is nice but...
51	-
52	-	[You should only add servers you trust and that you intend to use with agent forwarding.](https://docs.github.com/en/developers/overview/using-ssh-agent-forwarding)
53	-	[Why using SSH agent-forwarding is a Bad Idea](https://medium.com/kernel-space/why-using-ssh-agent-forwarding-is-a-bad-idea-6cbdff31bbee)
54	-
55	-	# SSH ProxyCommand / ProxyJump
56	-
57	-	```
58	-	~ via ☕ via 
59	-	✦ ❯ tail -7 .ssh/config
60	-	Host 192.168.66.*
61	-	# https://www.cyberciti.biz/faq/linux-unix-ssh-proxycommand-passing-through-one-host-gateway-server/
62	-	# https://goteleport.com/blog/ssh-proxyjump-ssh-proxycommand/
63	-	# https://en.wikibooks.org/wiki/OpenSSH/Cookbook/Proxies_and_Jump_Hosts
64	-	#ProxyJump user1@10.42.5.6:22
65	-	#ProxyCommand ssh -q -W %h:%p user1@10.42.5.6
66	-	ProxyCommand ssh -o 'ForwardAgent yes' 10.42.5.6 'ssh-add && nc %h %p'
67	-
68	-	```
69	-
70	-	ProxyJump can be chained by `ssh -J <host> -J <host>`.
71	-
72	-	# SSH Multiplexing
73	-
74	-	```
75	-	~ via ☕ via 
76	-	✦ ❯ tail -8 .ssh/config
77	-	Host *
78	-	# https://www.cyberciti.biz/faq/linux-unix-reuse-openssh-connection/
79	-	# https://blog.scottlowe.org/2015/12/11/using-ssh-multiplexing/
80	-	# https://en.wikibooks.org/wiki/OpenSSH/Cookbook/Multiplexing
81	-	ControlPath ~/.ssh/controlmasters/%r@%h:%p
82	-	ControlMaster auto
83	-	ControlPersist yes
84	-	MaxSessions 10
85	-	```
86	-
87	-	# [SSHFS](https://de.wikipedia.org/wiki/SSHFS)
88	-
89	-	```
90	-	sshfs [user@]hostname:[directory] mountpoint
91	-	```
92	-
93	-	[More](https://www.digitalocean.com/community/tutorials/how-to-use-sshfs-to-mount-remote-file-systems-over-ssh) information, [macFUSE and SSHFS](https://osxfuse.github.io/) and even [SSHFS-Win](https://osxfuse.github.io/). (mc is the amry knife)
94	-
95	-	# Port Forwarding / Tunneling
96	-
97	-	![SSH Tunnel](https://sslhowto.files.wordpress.com/2021/08/2922a-59b8e0_117ab19cfc3a42219ebb7ca9efa5c158mv2.png)
98	-
99	-	## Reverse Tunneling
100	-
101	-	![Reverse SSH Tunnel](https://sslhowto.files.wordpress.com/2021/08/86851-59b8e0_acd645df4dc647189417de5c5c57bfe5mv2.png)
102	-
103	-	[Adding / Removing Tunnels within an established connection](https://en.wikibooks.org/wiki/OpenSSH/Cookbook/Tunnels#Adding_or_Removing_Tunnels_within_an_Established_Connection)
104	-
105	-	# sshuttle: where transparent proxy meets VPN meets ssh
106	-
107	-	https://sshuttle.readthedocs.io/en/stable/manpage.html:
108	-	> sshuttle allows you to create a VPN connection from your machine to any remote server that you can connect to via ssh, as long as that server has a sufficiently new Python installation.
109	-	>
110	-	> To work, you must have root access on the local machine, but you can have a normal account on the server.
111	-	>
112	-	> It’s valid to run sshuttle more than once simultaneously on a single client machine, connecting to a different server every time, so you can be on more than one VPN at once.
113	-	>
114	-	> If run on a router, sshuttle can forward traffic for your entire subnet to the VPN.
115	-
116	-	# SSH and Visual Studio Code
117	-
118	-	[Remote development over SSH](https://code.visualstudio.com/docs/remote/ssh-tutorial)
119	-	[Remote Development using SSH](https://code.visualstudio.com/docs/remote/ssh)
120	-
121	-
122	-	https://www.maketecheasier.com/kill-unresponsive-ssh-session/

Jan Wagner revised this gist 3 years ago. Go to revision

1 file changed, 9 insertions, 2 deletions

slides.md

			@@ -74,7 +74,7 @@ Identity removed: /Users/waja/.ssh/id_rsa RSA (waja@Brotschneidemaschine.local)
74	74		```
75	75
76	76		<!--
77		-	show on jumphost / workstation
	77	+	show on jumphost
78	78		-->
79	79
80	80		---
			@@ -91,7 +91,7 @@ The agent has no identities.
91	91		```
92	92
93	93		<!--
94		-	show on jumphost / workstation
	94	+	show on jumphost
95	95		-->
96	96
97	97		- Maybe use something like
			@@ -181,3 +181,10 @@ ssh -L <localIP>:8000:<qnapIP>:8080 <localIP>
181	181
182	182		[Remote development over SSH](https://code.visualstudio.com/docs/remote/ssh-tutorial)
183	183		[Remote Development using SSH](https://code.visualstudio.com/docs/remote/ssh)
	184	+
	185	+	<!--
	186	+	ssh root@server "cat /etc/debian_version"
	187	+	scp jumphost:/tmp/test root@server:/tmp
	188	+	ssh -p port -t server "sudo whoami"
	189	+	scp -P port /etc/debian_version server:/tmp/
	190	+	-->

Jan Wagner revised this gist 3 years ago. Go to revision

1 file changed, 133 insertions, 1 deletion

slides.md

			@@ -1,6 +1,6 @@
1	1		<style type="text/css">
2	2		.reveal p {
3		-	text-align: left;
	3	+	text-align: center;
4	4		}
5	5		.reveal ul {
6	6		display: block;
			@@ -8,6 +8,13 @@
8	8		.reveal ol {
9	9		display: block;
10	10		}
	11	+	.reveal blockquote {
	12	+	font-size: 70%;
	13	+	}
	14	+	.reveal-viewport {
	15	+	background: #d1cec6;
	16	+	background-color: #d1cec6;
	17	+	}
11	18		</style>
12	19
13	20		```text
			@@ -18,6 +25,7 @@
18	25		\|_\| \___/ \_/\_/ \___\|_\| \___/\|_\| \|____/____/\|_\| \|_\|
19	26
20	27		```
	28	+
21	29		---
22	30
23	31		## Target audience
			@@ -47,5 +55,129 @@
47	55
48	56		---
49	57
	58	+	## Agent Forwarding
	59	+
	60	+	```bash
	61	+	$ eval "$(ssh-agent -s)"
	62	+	Agent pid 7715
	63	+	$ ssh-add -L
	64	+	The agent has no identities.
	65	+	$ ssh-add ~/.ssh/id_rsa
	66	+	Identity added: /Users/waja/.ssh/id_rsa (waja@Brotschneidemaschine.local)
	67	+	$ ssh-add -L
	68	+	ssh-rsa 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 waja@Brotschneidemaschine.local
	69	+	$ tail -2 .ssh/config
	70	+	Host *
	71	+	ForwardAgent yes
	72	+	$ ssh-add -d ~/.ssh/id_rsa
	73	+	Identity removed: /Users/waja/.ssh/id_rsa RSA (waja@Brotschneidemaschine.local)
	74	+	```
	75	+
	76	+	<!--
	77	+	show on jumphost / workstation
	78	+	-->
	79	+
	80	+	---
	81	+
	82	+	## Identities are not permanent
	83	+
	84	+	```bash
	85	+	$ kill -9 7715
	86	+	$ ssh-add -L
	87	+	$ eval "$(ssh-agent -s)"
	88	+	Agent pid 7795
	89	+	$ ssh-add -L
	90	+	The agent has no identities.
	91	+	```
	92	+
	93	+	<!--
	94	+	show on jumphost / workstation
	95	+	-->
	96	+
	97	+	- Maybe use something like
	98	+	```bash
	99	+	$ echo 'AddKeysToAgent yes' >> ~/.ssh/config
	100	+	```
	101	+	- You can [start](https://unix.stackexchange.com/a/390631) `ssh-agent` even via `systemd`.
	102	+
	103	+	---
	104	+
	105	+	## SSH Agent forwarding is nice but...
	106	+
	107	+	- [You should only add servers you trust and that you intend to use with agent forwarding.](https://docs.github.com/en/developers/overview/using-ssh-agent-forwarding)
	108	+	- [Why using SSH agent-forwarding is a Bad Idea](https://medium.com/kernel-space/why-using-ssh-agent-forwarding-is-a-bad-idea-6cbdff31bbee)
	109	+
	110	+	---
	111	+
	112	+	## SSH ProxyCommand / ProxyJump
	113	+
	114	+	```bash
	115	+	$ tail -7 .ssh/config
	116	+	Host 192.168.66.*
	117	+	# https://www.cyberciti.biz/faq/linux-unix-ssh-proxycommand-passing-through-one-host-gateway-server/
	118	+	# https://goteleport.com/blog/ssh-proxyjump-ssh-proxycommand/
	119	+	# https://en.wikibooks.org/wiki/OpenSSH/Cookbook/Proxies_and_Jump_Hosts
	120	+	#ProxyJump user1@10.42.5.6:22
	121	+	#ProxyCommand ssh -q -W %h:%p user1@10.42.5.6
	122	+	ProxyCommand ssh -o 'ForwardAgent yes' 10.42.5.6 'ssh-add && nc %h %p'
	123	+
	124	+	```
	125	+
	126	+	- ProxyJump can be chained by
	127	+	```bash
	128	+	$ ssh -J <host> -J <host>
	129	+	```
	130	+
	131	+	---
	132	+
	133	+	## [SSHFS](https://de.wikipedia.org/wiki/SSHFS)
	134	+
	135	+	```bash
	136	+	$ sshfs [user@]hostname:[directory] mountpoint
	137	+	```
	138	+
	139	+	[More](https://www.digitalocean.com/community/tutorials/how-to-use-sshfs-to-mount-remote-file-systems-over-ssh) information, [macFUSE and SSHFS](https://osxfuse.github.io/) and even [SSHFS-Win](https://osxfuse.github.io/). (mc is the army knife)
	140	+
	141	+	---
	142	+
	143	+	## mc can do sftp and ssh
	144	+
	145	+	![mc](images/mc.png)
	146	+
	147	+	---
	148	+
	149	+	## Port Forwarding / Tunneling
	150	+
	151	+	![SSH Tunnel](https://sslhowto.files.wordpress.com/2021/08/2922a-59b8e0_117ab19cfc3a42219ebb7ca9efa5c158mv2.png)
	152	+
	153	+	<!--
	154	+	ssh -L <localIP>:8000:<qnapIP>:8080 <localIP>
	155	+	-->
	156	+
	157	+	---
	158	+
	159	+	### Reverse Tunneling
	160	+
	161	+	![Reverse SSH Tunnel](https://sslhowto.files.wordpress.com/2021/08/86851-59b8e0_acd645df4dc647189417de5c5c57bfe5mv2.png)
	162	+
	163	+	[Adding / Removing Tunnels within an established connection](https://en.wikibooks.org/wiki/OpenSSH/Cookbook/Tunnels#Adding_or_Removing_Tunnels_within_an_Established_Connection)
50	164
51	165		---
	166	+
	167	+	#### sshuttle: where transparent proxy meets VPN meets ssh
	168	+
	169	+	<!--https://sshuttle.readthedocs.io/en/stable/manpage.html: -->
	170	+	> sshuttle allows you to create a VPN connection from your machine to any remote server that you can connect to via ssh, as long as that server has a sufficiently new Python installation.
	171	+	>
	172	+	> To work, you must have root access on the local machine, but you can have a normal account on the server.
	173	+	>
	174	+	> It’s valid to run sshuttle more than once simultaneously on a single client machine, connecting to a different server every time, so you can be on more than one VPN at once.
	175	+	>
	176	+	> If run on a router, sshuttle can forward traffic for your entire subnet to the VPN.
	177	+
	178	+	---
	179	+
	180	+	## SSH and Visual Studio Code
	181	+
	182	+	[Remote development over SSH](https://code.visualstudio.com/docs/remote/ssh-tutorial)
	183	+	[Remote Development using SSH](https://code.visualstudio.com/docs/remote/ssh)

Jan Wagner revised this gist 3 years ago. Go to revision

1 file changed, 51 insertions

slides.md(file created)

		@@ -0,0 +1,51 @@
1	+	<style type="text/css">
2	+	.reveal p {
3	+	text-align: left;
4	+	}
5	+	.reveal ul {
6	+	display: block;
7	+	}
8	+	.reveal ol {
9	+	display: block;
10	+	}
11	+	</style>
12	+
13	+	```text
14	+	____ __ ____ ____ _ _
15	+	\| _ \ _____ _____ _ __ ___ / _\| / ___/ ___\|\| \| \| \|
16	+	\| \|_) / _ \ \ /\ / / _ \ '__\| / _ \\| \|_ \___ \___ \\| \|_\| \|
17	+	\| __/ (_) \ V V / __/ \| \| (_) \| _\| ___) \|__) \| _ \|
18	+	\|_\| \___/ \_/\_/ \___\|_\| \___/\|_\| \|____/____/\|_\| \|_\|
19	+
20	+	```
21	+	---
22	+
23	+	## Target audience
24	+
25	+	- linux desktop CLI users
26	+	- linux admins
27	+
28	+	```text
29	+	__________________________________________
30	+	/ This is the year of linux on the desktop \
31	+	\| \|
32	+	\| ...Windows10 has WSL ;-) \|
33	+	\ /
34	+	------------------------------------------
35	+	\ ^__^
36	+	\ (oo)\_______
37	+	(__)\ )\/\
38	+	\|\|----w \|
39	+	\|\| \|\|
40	+	```
41	+
42	+	---
43	+
44	+	## [ssh-agent](https://www.ssh.com/academy/ssh/agent)
45	+
46	+	> The ssh-agent is a helper program that keeps track of user's identity keys and their passphrases. The agent can then use the keys to log into other servers without having the user type in a password or passphrase again. This implements a form of single sign-on (SSO).
47	+
48	+	---
49	+
50	+
51	+	---

waja revised this gist 3 years ago. Go to revision

1 file changed, 1 insertion, 1 deletion

tools.md

			@@ -4,7 +4,7 @@
4	4
5	5		# Working with serial console
6	6
7		-	`screen /dev/ttyS0 <speed>`
	7	+	`screen /dev/ttyS0 <speed>`
8	8		[Terminal emulators](https://wiki.archlinux.org/title/working_with_the_serial_console#Connect_using_a_terminal_emulator_program)
9	9		[Serial Port Tools on Linux](https://vmandela.com/blog/2019/2019-05-28-serial-port-tools.html)
10	10

waja revised this gist 3 years ago. Go to revision

1 file changed, 4 insertions, 1 deletion

tools.md

			@@ -6,4 +6,7 @@
6	6
7	7		`screen /dev/ttyS0 <speed>`
8	8		[Terminal emulators](https://wiki.archlinux.org/title/working_with_the_serial_console#Connect_using_a_terminal_emulator_program)
9		-	[Serial Port Tools on Linux](https://vmandela.com/blog/2019/2019-05-28-serial-port-tools.html)
	9	+	[Serial Port Tools on Linux](https://vmandela.com/blog/2019/2019-05-28-serial-port-tools.html)
	10	+
	11	+	https://github.com/draptik/2020-01-modern-linux-command-line-tools/blob/master/slides.md
	12	+	https://github.com/MATHEMA-GmbH/2021-06-modern-linux-command-line-tools/blob/main/slides-export.pdf

waja revised this gist 3 years ago. Go to revision

1 file changed, 9 insertions

tools.md(file created)

		@@ -0,0 +1,9 @@
1	+	# tmux - terminal multiplexer
2	+
3	+	[A Quick and Easy Guide to tmux](https://www.hamvocke.com/blog/a-quick-and-easy-guide-to-tmux/)
4	+
5	+	# Working with serial console
6	+
7	+	`screen /dev/ttyS0 <speed>`
8	+	[Terminal emulators](https://wiki.archlinux.org/title/working_with_the_serial_console#Connect_using_a_terminal_emulator_program)
9	+	[Serial Port Tools on Linux](https://vmandela.com/blog/2019/2019-05-28-serial-port-tools.html)

waja revised this gist 3 years ago. Go to revision

1 file changed, 1 insertion, 1 deletion

ssh.md

			@@ -115,7 +115,7 @@ https://sshuttle.readthedocs.io/en/stable/manpage.html:
115	115
116	116		# SSH and Visual Studio Code
117	117
118		-	[Remote development over SSH](https://code.visualstudio.com/docs/remote/ssh-tutorial)
	118	+	[Remote development over SSH](https://code.visualstudio.com/docs/remote/ssh-tutorial)
119	119		[Remote Development using SSH](https://code.visualstudio.com/docs/remote/ssh)
120	120
121	121

waja revised this gist 3 years ago. Go to revision

1 file changed, 19 insertions

ssh.md

			@@ -100,4 +100,23 @@ sshfs [user@]hostname:[directory] mountpoint
100	100
101	101		![Reverse SSH Tunnel](https://sslhowto.files.wordpress.com/2021/08/86851-59b8e0_acd645df4dc647189417de5c5c57bfe5mv2.png)
102	102
	103	+	[Adding / Removing Tunnels within an established connection](https://en.wikibooks.org/wiki/OpenSSH/Cookbook/Tunnels#Adding_or_Removing_Tunnels_within_an_Established_Connection)
	104	+
	105	+	# sshuttle: where transparent proxy meets VPN meets ssh
	106	+
	107	+	https://sshuttle.readthedocs.io/en/stable/manpage.html:
	108	+	> sshuttle allows you to create a VPN connection from your machine to any remote server that you can connect to via ssh, as long as that server has a sufficiently new Python installation.
	109	+	>
	110	+	> To work, you must have root access on the local machine, but you can have a normal account on the server.
	111	+	>
	112	+	> It’s valid to run sshuttle more than once simultaneously on a single client machine, connecting to a different server every time, so you can be on more than one VPN at once.
	113	+	>
	114	+	> If run on a router, sshuttle can forward traffic for your entire subnet to the VPN.
	115	+
	116	+	# SSH and Visual Studio Code
	117	+
	118	+	[Remote development over SSH](https://code.visualstudio.com/docs/remote/ssh-tutorial)
	119	+	[Remote Development using SSH](https://code.visualstudio.com/docs/remote/ssh)
	120	+
	121	+
103	122		https://www.maketecheasier.com/kill-unresponsive-ssh-session/

waja revised this gist 3 years ago. Go to revision

1 file changed, 4 insertions, 2 deletions

ssh.md

			@@ -90,12 +90,14 @@ Host *
90	90		sshfs [user@]hostname:[directory] mountpoint
91	91		```
92	92
93		-	[More](https://www.digitalocean.com/community/tutorials/how-to-use-sshfs-to-mount-remote-file-systems-over-ssh) information, [macFUSE and SSHFS](https://osxfuse.github.io/) and even [SSHFS-Win](https://osxfuse.github.io/).
	93	+	[More](https://www.digitalocean.com/community/tutorials/how-to-use-sshfs-to-mount-remote-file-systems-over-ssh) information, [macFUSE and SSHFS](https://osxfuse.github.io/) and even [SSHFS-Win](https://osxfuse.github.io/). (mc is the amry knife)
94	94
95	95		# Port Forwarding / Tunneling
96	96
97		-	! [SSH Tunnel](https://sslhowto.files.wordpress.com/2021/08/2922a-59b8e0_117ab19cfc3a42219ebb7ca9efa5c158mv2.png)
	97	+	![SSH Tunnel](https://sslhowto.files.wordpress.com/2021/08/2922a-59b8e0_117ab19cfc3a42219ebb7ca9efa5c158mv2.png)
98	98
99	99		## Reverse Tunneling
100	100
	101	+	![Reverse SSH Tunnel](https://sslhowto.files.wordpress.com/2021/08/86851-59b8e0_acd645df4dc647189417de5c5c57bfe5mv2.png)
	102	+
101	103		https://www.maketecheasier.com/kill-unresponsive-ssh-session/

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