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As specified in #LP 1845552,
In cloudinit/ssh_util.py, in parse_ssh_config_lines(), we attempt to
parse each line of sshd_config. This function expects each line to
be one of the following forms:
\# comment
key value
key=value
However, options like DenyGroups and DenyUsers are specified to
*optionally* accepts values in sshd_config.
Cloud-init should comply to this and skip the option if a value
is not provided.
Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
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Fix home permissions modified by ssh module
In #956, we updated the file and directory permissions for keys not in
the user's home directory. We also unintentionally modified the
permissions within the home directory as well. These should not change,
and this commit changes that back.
LP: #1940233
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In /etc/ssh/sshd_config, it is possible to define a custom
authorized_keys file that will contain the keys allowed to access the
machine via the AuthorizedKeysFile option. Cloudinit is able to add
user-specific keys to the existing ones, but we need to be careful on
which of the authorized_keys files listed to pick.
Chosing a file that is shared by all user will cause security
issues, because the owner of that key can then access also other users.
We therefore pick an authorized_keys file only if it satisfies the
following conditions:
1. it is not a "global" file, ie it must be defined in
AuthorizedKeysFile with %u, %h or be in /home/<user>. This avoids
security issues.
2. it must comply with ssh permission requirements, otherwise the ssh
agent won't use that file.
If it doesn't meet either of those conditions, write to
~/.ssh/authorized_keys
We also need to consider the case when the chosen authorized_keys file
does not exist. In this case, the existing behavior of cloud-init is
to create the new file. We therefore need to be sure that the file
complies with ssh permissions too, by setting:
- the actual file to permission 600, and owned by the user
- the directories in the path that do not exist must be root owned and
with permission 755.
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defined in AuthorizedKeysFile (#937)
This patch aims to fix LP1911680, by analyzing the files provided
in sshd_config and merge all keys into an user-specific file. Also
introduces additional tests to cover this specific case.
The file is picked by analyzing the path given in AuthorizedKeysFile.
If it points inside the current user folder (path is /home/user/*), it
means it is an user-specific file, so we can copy all user-keys there.
If it contains a %u or %h, it means that there will be a specific
authorized_keys file for each user, so we can copy all user-keys there.
If no path points to an user-specific file, for example when only
/etc/ssh/authorized_keys is given, default to ~/.ssh/authorized_keys.
Note that if there are more than a single user-specific file, the last
one will be picked.
Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Co-authored-by: James Falcon <therealfalcon@gmail.com>
LP: #1911680
RHBZ:1862967
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This reverts commit b0e73814db4027dba0b7dc0282e295b7f653325c.
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The following commit merged all ssh keys into a default user file
`~/.ssh/authorized_keys` in sshd_config had multiple files configured for
AuthorizedKeysFile:
commit f1094b1a539044c0193165a41501480de0f8df14
Author: Eduardo Otubo <otubo@redhat.com>
Date: Thu Dec 5 17:37:35 2019 +0100
Multiple file fix for AuthorizedKeysFile config (#60)
This commit ignored the case when sshd_config would have a single file for
AuthorizedKeysFile, but a non default configuration, for example
`~/.ssh/authorized_keys_foobar`. In this case cloud-init would grab all keys
from this file and write a new one, the default `~/.ssh/authorized_keys`
causing the bug.
rhbz: #1862967
Signed-off-by: Eduardo Otubo <otubo@redhat.com>
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Update ssh_util.py with latest list of keys (from openssh-8.3p1/sshkey.c),
Added keys:
sk-ecdsa-sha2-nistp256-cert-v01@openssh.com
sk-ecdsa-sha2-nistp256@openssh.com
sk-ssh-ed25519-cert-v01@openssh.com
sk-ssh-ed25519@openssh.com
ssh-xmss-cert-v01@openssh.com
ssh-xmss@openssh.com
LP: #1877869
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It is confusing for scripts, where a disabled user has been specified,
that ssh exits with a zero status by default without indication anything
failed.
I think exitting with a non-zero status would make more clear in scripts
and automated setups where things failed, thus making noticing the issue
and debugging easier.
Signed-off-by: Eduardo Otubo <otubo@redhat.com>
Signed-off-by: Aleksandar Kostadinov <akostadi@redhat.com>
LP: #1170059
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When updating the docstring to include it, I realised that the current
name is somewhat misleading; this makes it a little easier to
understand, I think.
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This removes the use of variables named ‘l’, ‘O’, or ‘I’. Generally
these are used in list comprehension to read the line of lines.
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* cc_ssh: fix capitalisation of SSH
* doc: fix capitalisation of SSH
* cc_keys_to_console: fix capitalisation of SSH
* ssh_util: fix capitalisation of SSH
* DataSourceIBMCloud: fix capitalisation of SSH
* DataSourceAzure: fix capitalisation of SSH
* cs_utils: fix capitalisation of SSH
* distros/__init__: fix capitalisation of SSH
* cc_set_passwords: fix capitalisation of SSH
* cc_ssh_import_id: fix capitalisation of SSH
* cc_users_groups: fix capitalisation of SSH
* cc_ssh_authkey_fingerprints: fix capitalisation of SSH
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Currently cloud-init does not know how to handle multiple file
configuration on section AuthorizedKeysFile of ssh configuration.
cloud-init will mess up the home user directory by creating bogus
folders inside it.
This patch provides a fix for this erroneous behavior. It gathers all
keys from all the files listed on the section AuthorizedKeysFile of ssh
configuration and merge all of them inside home user
~/.ssh/authorized_keys of the vm deployed.
Signed-off-by: Eduardo Otubo <otubo@redhat.com>
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Cloud config can now disable ssh access to non-root users.
When defining the 'users' list in cloud-configuration a boolean
'ssh_redirect_user: true' can be provided to disable ssh logins for
that user. Any ssh 'public-keys' defined in cloud meta-data will be added
and disabled in .ssh/authorized_keys. Any attempts to ssh as this user
using acceptable ssh keys will be presented with a message like the
following:
Please login as the user "ubuntu" rather than the user "youruser".
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This admittedly does a fairly extensive re-factor to simply add a newline
to the end of sshd_config.
It makes the ssh_config updating portion of set_passwords more testable
and adds tests for that.
The new function is in 'update_ssh_config_lines' which allows you
to update a config with multiple changes even though only a single one
is currently used.
We also only restart the ssh daemon now if a change was made to the
config file. Before it was always restarted if the user specified
a value for ssh_pwauth other than 'unchanged'.
Thanks to Lorens Kockum for initial diagnosis and patch.
LP: #1677205
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This fixes a bug where invalid keys would sneak into authorized_keys.
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cloud-init adds ssh_authorized_keys to the default user and to
root but for root it disables the keys with a prefix command.
However, if the public_key key is of type ecdsa-sha2-nistp521,
it is not parsed correctly, and the prefix command is not prepended.
Resolves: rhbz#1151824
LP: #1658174
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This has been a recurring ask and we had initially just made the change to
the cloud-init 2.0 codebase. As the current thinking is we'll just
continue to enhance the current codebase, its desirable to relicense to
match what we'd intended as part of the 2.0 plan here.
- put a brief description of license in LICENSE file
- put full license versions in LICENSE-GPLv3 and LICENSE-Apache2.0
- simplify the per-file header to reference LICENSE
- tox: ignore H102 (Apache License Header check)
Add license header to files that ship.
Reformat headers, make sure everything has vi: at end of file.
Non-shipping files do not need the copyright header,
but at the moment tests/ have it.
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Update ssh_util.py with latest list of keys (from openssh-7.3p1/sshkeys.c),
and remove extinct keys ending with "-v00@openssh.com"
Added keys:
rsa-sha2-256,
rsa-sha2-512,
ed25519,
ssh-ed25519,
ssh-ed25519-cert-v01@openssh.com
Removed both of the double entries for the keys:
ssh-dss-cert-v00@openssh.com
ssh-rsa-cert-v00@openssh.com
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to be behind trunk.
`tox -e py27` passes full test suite. Now to work on replacing mocker.
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Now, parser.parse specifies options that override any options found,
rather than just being default options.
There could still potentially be a user for default_options, but since we're
not using them anywhere, I've dropped it. The difference is that in setting up
the root user, we're now insisting that all keys that go in there have the
key_prefix, even if the key content had other options.
I think this is actually the commit that fixes LP: #1136343.
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* drop the parsing of options into csv, as we were only exploding them
back. That can only result in error. Just do minimal parsing.
* change the parsing of key lines to:
if entry is valid:
* use it
else try taking off options:
if good, use it
else fail
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1. Remove the usage of the path.join function
now that all code should be going through
the util file methods (and they can be
mocked out as needed).
2. Adjust all occurences of the above join
function to either not use it or replace
it with the standard os.path.join (which
can also be mocked out as needed)
3. Fix pylint from complaining about the
tests folder 'helpers.py' not being found
4. Add a pylintrc file that is used instead
of the options hidden in the 'run_pylint'
tool.
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1. Adjust the sshutil so that it has functions
for doing this (used by the previous functions)
2. Create a new module that pretty prints out
the given authorized keys fetched (if any) using the standard
md5 scheme (for now), this module can be disabled by
setting 'no_ssh_fingerprints' or just removing it from the running
list.
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with non-real read/write paths is easier.
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since its not currently being called that way
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Also have a method that will parse the authorized key file.
This allows:
1. Testing of parsing seperate from testing of entry construction.
1. Testing of authorized key file parsing, separate from updating.
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that are done for option extraction
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other pylint cleanups.
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method). Handle error cases better...
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needed.
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importing, constant usage.
1. Move all datasources to a new sources directory
1. Rename some files to be more consistent with python file/module naming.
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