- Excel Generate Random String
- Ansible Generate Random Hex String
- Ansible Generate Random String Python
- Ansible Generate Random String
2016-3-5 Convert list variable to comma separated list in ansible. To convert list variable such as: arguments: 'value1', 'value2', 'value3' to a command separate value in a template file use. Replace my-ansible-vault-pw with a random string of your choosing. Now we can create an encrypted SSH password for our remote host using that passphrase. The following command will do just that. Ansible playbook execute in this order: task, role, task, role, task. I recommend you create roles for post and pre tasks for you ansible.
So I need to create an user in a machine so I can then have a script that will log into this machine and backup its database. Which database is that, you might ask? For this discussion it does not matter besides that it is running in a Linux box. But, if you want a more specific example, we could be backing up a sqlite database since we talked about how to do the deed before.
Anyway, the plan is to have the script ssh into the database server and grab the backup. Since we are using ssh in the script, we might as well use key pair authentication. Now I have learned that by default if you create a user and do not assign it a password, you will not be able to login as said user using key pair authentication. You can turn that off but I would rather not. Instead, since I am creating said user programmatically, I can give it a long random password.
Excel Generate Random String
Now that we have a plan, let's see how to do it in an ansible playbook. I will present only the relevant bits since I do not know how you do your playbooks. So, we could create a user using something like
which would create user user_name who will also belong to the groups defined in user_groups, where user_name and user_groups are variables defined somewhere earlier in the show. Vp asp shopping cart 5.00 software installed. And this would create a user without a password, which would do us no good. Nor would us make the playbook stop and ask us to enter a password. We said earlier we are going to create a random password, so let's see if we can make something random enough for our needs.
I plan on generating this random password in the machine we are running ansible on, not the target machine. One of the reasons is that I want to use the Linux command mkpassword to create the password hash (note it is being called using the shell command. So, I will use a local_action to do the deed. For instance, let's say I want the password to be pickles and encoded using SHA-512 hash (mild encryption). I could accomplish it by writing
This would create a hash, say
and assign it to the variable user_pw. This of course has to be done before the user is created. To use it with our new user, we can then modify our little user creation function to something like this:
In the last line we are feeding the value of user_pw, user_pw.stdout, to password. But why can't I just feed user_pw? Here's an exercise to you: tell your playbook just print user_pw. Doesn't it look very object-like?
If you run your playbook and all went well, go to the target machine and check if there is a password associated with the user in /etc/shadow. If the user was already created, you will need to delete user and let ansible recreate it.
So we have so far created a way to create a password hash and then create a new user with that password. The last step we need is to make the password random. Here is what I am proposing: how about if we use date since epoch in seconds as our password and then mangle it a bit? Here is a simple mangling example:
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Which gives b8a49ccaa4721877cf39e510c7ac3622 as the output, which should be long enough to fulfill our needs. Of course if you run it again, it will spit out a different result, which is what we want? Perfectly random? Not by a long shot, but it is long enough for our needs. Remember: there is nothing saying you have to use the above. Hav efun creating your own function!
So, let's apply that to our little password generating function:
And we should be good to go. Here is how the final version should look like in a playbook:
Now we have an user, we can then create the ssh key pair we talked about in an earlier article. Of course we might edit the ./ssh/authorized_keys file to restrict what that key can do.
- This module allows one to (re)generate OpenSSL private keys.
- One can generate RSA, DSA, ECC or EdDSA private keys.
- Keys are generated in PEM format.
- Please note that the module regenerates private keys if they don’t match the module’s options. In particular, if you provide another passphrase (or specify none), change the keysize, etc., the private key will be regenerated. If you are concerned that this could overwrite your private key, consider using the backup option.
- The module can use the cryptography Python library, or the pyOpenSSL Python library. By default, it tries to detect which one is available. This can be overridden with the select_crypto_backend option. Please note that the PyOpenSSL backend was deprecated in Ansible 2.9 and will be removed in Ansible 2.13.”
The below requirements are needed on the host that executes this module.
- Either cryptography >= 1.2.3 (older versions might work as well)
- Or pyOpenSSL
Parameter | Choices/Defaults | Comments |
---|---|---|
attributes string | The attributes the resulting file or directory should have. To get supported flags look at the man page for chattr on the target system. This string should contain the attributes in the same order as the one displayed by lsattr. The = operator is assumed as default, otherwise + or - operators need to be included in the string. | |
backup added in 2.8 |
| Create a backup file including a timestamp so you can get the original private key back if you overwrote it with a new one by accident. |
cipher string | The cipher to encrypt the private key. (Valid values can be found by running `openssl list -cipher-algorithms` or `openssl list-cipher-algorithms`, depending on your OpenSSL version.) | |
curve added in 2.8 |
| Note that not all curves are supported by all versions of cryptography .For maximal interoperability, secp384r1 or secp256r1 should be used.We use the curve names as defined in the IANA registry for TLS. |
force boolean |
| Should the key be regenerated even if it already exists. |
group string | Name of the group that should own the file/directory, as would be fed to chown. | |
mode string | The permissions the resulting file or directory should have. For those used to /usr/bin/chmod remember that modes are actually octal numbers. You must either add a leading zero so that Ansible's YAML parser knows it is an octal number (like 0644 or 01777 ) or quote it (like '644' or '1777' ) so Ansible receives a string and can do its own conversion from string into number.Giving Ansible a number without following one of these rules will end up with a decimal number which will have unexpected results. As of Ansible 1.8, the mode may be specified as a symbolic mode (for example, u+rwx or u=rw,g=r,o=r ).As of Ansible 2.6, the mode may also be the special string preserve .When set to preserve the file will be given the same permissions as the source file. | |
owner string | Name of the user that should own the file/directory, as would be fed to chown. | |
passphrase string | The passphrase for the private key. | |
path path / required | Name of the file in which the generated TLS/SSL private key will be written. It will have 0600 mode. | |
select_crypto_backend string |
| The default choice is auto , which tries to use cryptography if available, and falls back to pyopenssl .If set to pyopenssl , will try to use the pyOpenSSL library.If set to cryptography , will try to use the cryptography library.Please note that the pyopenssl backend has been deprecated in Ansible 2.9, and will be removed in Ansible 2.13. From that point on, only the cryptography backend will be available. |
selevel string | Default: | The level part of the SELinux file context. This is the MLS/MCS attribute, sometimes known as the range .When set to _default , it will use the level portion of the policy if available. |
serole string | When set to _default , it will use the role portion of the policy if available. | |
setype string | When set to _default , it will use the type portion of the policy if available. | |
seuser string | By default it uses the system policy, where applicable.When set to _default , it will use the user portion of the policy if available. | |
size integer | Default: | Size (in bits) of the TLS/SSL key to generate. |
state string |
| Whether the private key should exist or not, taking action if the state is different from what is stated. |
type string |
| The algorithm used to generate the TLS/SSL private key. Note that ECC , X25519 , X448 , Ed25519 and Ed448 require the cryptography backend. X25519 needs cryptography 2.5 or newer, while X448 , Ed25519 and Ed448 require cryptography 2.6 or newer. For ECC , the minimal cryptography version required depends on the curve option. |
unsafe_writes boolean |
| Influence when to use atomic operation to prevent data corruption or inconsistent reads from the target file. By default this module uses atomic operations to prevent data corruption or inconsistent reads from the target files, but sometimes systems are configured or just broken in ways that prevent this. One example is docker mounted files, which cannot be updated atomically from inside the container and can only be written in an unsafe manner. This option allows Ansible to fall back to unsafe methods of updating files when atomic operations fail (however, it doesn't force Ansible to perform unsafe writes). IMPORTANT! Unsafe writes are subject to race conditions and can lead to data corruption. |
See also
- openssl_certificate – Generate and/or check OpenSSL certificates
- The official documentation on the openssl_certificate module.
- openssl_csr – Generate OpenSSL Certificate Signing Request (CSR)
- The official documentation on the openssl_csr module.
- openssl_dhparam – Generate OpenSSL Diffie-Hellman Parameters
- The official documentation on the openssl_dhparam module.
- openssl_pkcs12 – Generate OpenSSL PKCS#12 archive
- The official documentation on the openssl_pkcs12 module.
- openssl_publickey – Generate an OpenSSL public key from its private key
- The official documentation on the openssl_publickey module.
Common return values are documented here, the following are the fields unique to this module:
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Key | Returned | Description |
---|---|---|
backup_file string | changed and if backup is yes | Sample: |
curve | changed or success, and type is ECC | Elliptic curve used to generate the TLS/SSL private key. secp256r1 |
filename string | changed or success | Sample: |
fingerprint | changed or success | The fingerprint of the public key. Fingerprint will be generated for each hashlib.algorithms available.The PyOpenSSL backend requires PyOpenSSL >= 16.0 for meaningful output. {'md5': '84:75:71:72:8d:04:b5:6c:4d:37:6d:66:83:f5:4c:29', 'sha1': '51:cc:7c:68:5d:eb:41:43:88:7e:1a:ae:c7:f8:24:72:ee:71:f6:10', 'sha224': 'b1:19:a6:6c:14:ac:33:1d:ed:18:50:d3:06:5c:b2:32:91:f1:f1:52:8c:cb:d5:75:e9:f5:9b:46', 'sha256': '41:ab:c7:cb:d5:5f:30:60:46:99:ac:d4:00:70:cf:a1:76:4f:24:5d:10:24:57:5d:51:6e:09:97:df:2f:de:c7', 'sha384': '85:39:50:4e:de:d9:19:33:40:70:ae:10:ab:59:24:19:51:c3:a2:e4:0b:1c:b1:6e:dd:b3:0c:d9:9e:6a:46:af:da:18:f8:ef:ae:2e:c0:9a:75:2c:9b:b3:0f:3a:5f:3d', 'sha512': 'fd:ed:5e:39:48:5f:9f:fe:7f:25:06:3f:79:08:cd:ee:a5:e7:b3:3d:13:82:87:1f:84:e1:f5:c7:28:77:53:94:86:56:38:69:f0:d9:35:22:01:1e:a6:60:..:0f:9b'} |
size integer | changed or success | Sample: |
type | changed or success | Algorithm used to generate the TLS/SSL private key. RSA |
Ansible Generate Random Hex String
- This module is not guaranteed to have a backwards compatible interface. [preview]
- This module is maintained by the Ansible Community. [community]
Authors¶
- Yanis Guenane (@Spredzy)
- Felix Fontein (@felixfontein)
Ansible Generate Random String Python
Hint
Ansible Generate Random String
If you notice any issues in this documentation, you can edit this document to improve it.