- Ansible Vault
- What Can Be Encrypted With Vault
- Vault IDs and Multiple Vault Passwords
- Creating Encrypted Files
- Editing Encrypted Files
- Rekeying Encrypted Files
- Encrypting Unencrypted Files
- Decrypting Encrypted Files
- Viewing Encrypted Files
- Use encrypt_string to create encrypted variables to embed in yaml
- Providing Vault Passwords
- Vault Password Client Scripts
- Speeding Up Vault Operations
- Vault Format
- Vault Payload Format 1.1 - 1.2
Ansible Vault is a feature of ansible that allows you to keep sensitive data such as passwords or keys in encrypted files, rather than as plaintext in playbooks or roles. These vault files can then be distributed or placed in source control.
To enable this feature, a command line tool - ansible-vault - is used to edit files, and a command line flag (
--vault-id) is used. Alternately, you may specify the location of a password file or command Ansible to always prompt for the password in your ansible.cfg file. These options require no command line flag usage.
For best practices advice, refer to Variables and Vaults.
Ansible Vault can encrypt any structured data file used by Ansible.
This can include “group_vars/” or “host_vars/” inventory variables, variables loaded by “include_vars” or “vars_files”, or variable files passed on the ansible-playbook command line with
-e @file.yml or
-e @file.json. Role variables and defaults are also included.
Ansible tasks, handlers, and so on are also data so these can be encrypted with vault as well. To hide the names of variables that you’re using, you can encrypt the task files in their entirety.
Ansible Vault can also encrypt arbitrary files, even binary files. If a vault-encrypted file is
given as the
src argument to the copy, template,
unarchive, script or assemble modules, the file will be placed at the destination on the target host decrypted
(assuming a valid vault password is supplied when running the play).
The advantages of file-level encryption are that it is easy to use and that password rotation is straightforward with rekeying. The drawback is that the contents of files are no longer easy to access and read. This may be problematic if it is a list of tasks (when encrypting a variables file, best practice is to keep references to these variables in a non-encrypted file).
Ansible also supports encrypting single values inside a YAML file, using the !vault tag to let YAML and Ansible know it uses special processing. This feature is covered in more detail below.
The advantage of variable-level encryption is that files are still easily legible even if they mix plaintext and encrypted variables. The drawback is that password rotation is not as simple as with file-level encryption: the rekey command does not work with this method.
A vault ID is an identifier for one or more vault secrets; Ansible supports multiple vault passwords.
Vault IDs provide labels to distinguish between individual vault passwords.
To use vault IDs, you must provide an ID label of your choosing and a source to obtain its password (either
prompt or a file path):
--vault-id [email protected]
Vault-encrypted content can specify which vault ID it was encrypted with.
For example, a playbook can now include a vars file encrypted with a ‘dev’ vault ID and a ‘prod’ vault ID.
To create a new encrypted data file, run the following command:
ansible-vault create foo.yml
First you will be prompted for a password. After providing a password, the tool will launch whatever editor you have defined with $EDITOR, and defaults to vi. Once you are done with the editor session, the file will be saved as encrypted data.
The default cipher is AES (which is shared-secret based).
To create a new encrypted data file with the Vault ID ‘password1’ assigned to it and be prompted for the password, run:
ansible-vault create --vault-id [email protected] foo.yml
To edit an encrypted file in place, use the ansible-vault edit command. This command will decrypt the file to a temporary file and allow you to edit the file, saving it back when done and removing the temporary file:
ansible-vault edit foo.yml
To edit a file encrypted with the ‘vault2’ password file and assigned the ‘pass2’ vault ID:
ansible-vault edit --vault-id [email protected] foo.yml
Should you wish to change your password on a vault-encrypted file or files, you can do so with the rekey command:
ansible-vault rekey foo.yml bar.yml baz.yml
This command can rekey multiple data files at once and will ask for the original password and also the new password.
To rekey files encrypted with the ‘preprod2’ vault ID and the ‘ppold’ file and be prompted for the new password:
A different ID could have been set for the rekeyed files by passing it to
If you have existing files that you wish to encrypt, use the ansible-vault encrypt command. This command can operate on multiple files at once:
ansible-vault encrypt foo.yml bar.yml baz.yml
To encrypt existing files with the ‘project’ ID and be prompted for the password:
ansible-vault encrypt --vault-id [email protected] foo.yml bar.yml baz.yml
It is technically possible to separately encrypt files or strings with the same vault ID but different passwords, if different password files or prompted passwords are provided each time. This could be desirable if you use vault IDs as references to classes of passwords (rather than a single password) and you always know which specific password or file to use in context. However this may be an unnecessarily complex use-case. If two files are encrypted with the same vault ID but different passwords by accident, you can use the rekey command to fix the issue.
If you have existing files that you no longer want to keep encrypted, you can permanently decrypt them by running the ansible-vault decrypt command. This command will save them unencrypted to the disk, so be sure you do not want ansible-vault edit instead:
ansible-vault decrypt foo.yml bar.yml baz.yml
If you want to view the contents of an encrypted file without editing it, you can use the ansible-vault view command:
ansible-vault view foo.yml bar.yml baz.yml
To encrypt a string provided as a cli arg:
ansible-vault encrypt_string --vault-password-file a_password_file 'foobar' --name 'the_secret'
the_secret: !vault | $ANSIBLE_VAULT;1.1;AES256 62313365396662343061393464336163383764373764613633653634306231386433626436623361 6134333665353966363534333632666535333761666131620a663537646436643839616531643561 63396265333966386166373632626539326166353965363262633030333630313338646335303630 3438626666666137650a353638643435666633633964366338633066623234616432373231333331 6564
To use a vault-id label for ‘dev’ vault-id:
ansible-vault encrypt_string --vault-id [email protected]_password_file 'foooodev' --name 'the_dev_secret'
the_dev_secret: !vault | $ANSIBLE_VAULT;1.2;AES256;dev 30613233633461343837653833666333643061636561303338373661313838333565653635353162 3263363434623733343538653462613064333634333464660a663633623939393439316636633863 61636237636537333938306331383339353265363239643939666639386530626330633337633833 6664656334373166630a363736393262666465663432613932613036303963343263623137386239 6330
To encrypt a string read from stdin and name it ‘db_password’:
echo -n 'letmein' | ansible-vault encrypt_string --vault-id [email protected]_password_file --stdin-name 'db_password'
This method leaves the string in your shell history. Do not use it outside of testing.
Reading plaintext input from stdin. (ctrl-d to end input) db_password: !vault | $ANSIBLE_VAULT;1.2;AES256;dev 61323931353866666336306139373937316366366138656131323863373866376666353364373761 3539633234313836346435323766306164626134376564330a373530313635343535343133316133 36643666306434616266376434363239346433643238336464643566386135356334303736353136 6565633133366366360a326566323363363936613664616364623437336130623133343530333739 3039
To be prompted for a string to encrypt, encrypt it, and give it the name ‘new_user_password’:
ansible-vault encrypt_string --vault-id [email protected]_password_file --stdin-name 'new_user_password'
Reading plaintext input from stdin. (ctrl-d to end input)
User enters ‘hunter2’ and hits ctrl-d.
Do not press Enter after supplying the string. That will add a newline to the encrypted value.
new_user_password: !vault | $ANSIBLE_VAULT;1.2;AES256;dev 37636561366636643464376336303466613062633537323632306566653533383833366462366662 6565353063303065303831323539656138653863353230620a653638643639333133306331336365 62373737623337616130386137373461306535383538373162316263386165376131623631323434 3866363862363335620a376466656164383032633338306162326639643635663936623939666238 3161
See also Single Encrypted Variable
For example, to use a password store in the text file
ansible-playbook --vault-password-file /path/to/my/vault-password-file site.yml
To prompt for a password:
ansible-playbook --ask-vault-pass site.yml
To get the password from a vault password executable script
ansible-playbook --vault-password-file my-vault-password.py
Since Ansible 2.4 the
--vault-id can be used to indicate which vault ID
(‘dev’, ‘prod’, ‘cloud’, etc) a password is for as well as how to source the password (prompt, a file path, etc).
By default the vault-id label is only a hint, any values encrypted with the password will be decrypted. The config option DEFAULT_VAULT_ID_MATCH can be set to require the vault id to match the vault ID used when the value was encrypted. This can reduce errors when different values are encrypted with different passwords.
For example, to use a password file
dev-password for the vault-id ‘dev’:
To prompt for the password for the ‘dev’ vault ID:
To get the ‘dev’ vault ID password from an executable script
ansible-playbook --vault-id [email protected]
For example, to use a password file
ansible-playbook --vault-id dev-password site.yml
To prompt for the password:
ansible-playbook --vault-id @prompt site.yml
To get the password from an executable script
ansible-playbook --vault-id my-vault-password.py
Ansible 2.4 and later support using multiple vault passwords,
be provided multiple times.
For example, to use a ‘dev’ password read from a file and to be prompted for the ‘prod’ password:
By default the vault ID labels (dev, prod etc.) are only hints, Ansible will attempt to decrypt vault content with each password. The password with the same label as the encrypted data will be tried first, after that each vault secret will be tried in the order they were provided on the command line.
Where the encrypted data doesn’t have a label, or the label doesn’t match any of the provided labels, the passwords will be tried in the order they are specified.
In the above case, the ‘dev’ password will be tried first, then the ‘prod’ password for cases where Ansible doesn’t know which vault ID is used to encrypt something.
To add a vault ID label to the encrypted data use the
with a label when encrypting the data.
The DEFAULT_VAULT_ID_MATCH config option can be set so that Ansible will only use the password with the same label as the encrypted data. This is more efficient and may be more predictable when multiple passwords are used.
When implementing a script to obtain a vault password it may be convenient to know which vault ID label was requested. For example a script loading passwords from a secret manager may want to use the vault ID label to pick either the ‘dev’ or ‘prod’ password.
Since Ansible 2.5 this is supported through the use of Client Scripts. A Client Script is an executable script
with a name ending in
-client. Client Scripts are used to obtain vault passwords in the same way as any other
executable script. For example:
ansible-playbook --vault-id [email protected]/vault/vault-keyring-client.py
The difference is in the implementation of the script. Client Scripts are executed with a
so they know which vault ID label was requested. So the above Ansible execution results in the below execution
of the Client Script:
contrib/vault/vault-keyring-client.py --vault-id dev
contrib/vault/vault-keyring-client.py is an example of Client Script that loads passwords from the
By default, Ansible uses PyCrypto to encrypt and decrypt vault files. If you have many encrypted files, decrypting them at startup may cause a perceptible delay. To speed this up, install the cryptography package:
pip install cryptography
A vault encrypted file is a UTF-8 encoded txt file.
The file format includes a newline terminated header.
The header contains the vault format id, the vault format version, the vault cipher, and a vault-id label (with format version 1.2), separated by semi-colons ‘;’
The first field
$ANSIBLE_VAULT is the format id. Currently
$ANSIBLE_VAULT is the only valid file format id. This is used to identify files that are vault encrypted (via vault.is_encrypted_file()).
The second field (
1.X) is the vault format version. All supported versions of ansible will currently default to ‘1.1’ or ‘1.2’ if a labeled vault-id is supplied.
The ‘1.0’ format is supported for reading only (and will be converted automatically to the ‘1.1’ format on write). The format version is currently used as an exact string compare only (version numbers are not currently ‘compared’).
The third field (
AES256) identifies the cipher algorithm used to encrypt the data. Currently, the only supported cipher is ‘AES256’. [vault format 1.0 used ‘AES’, but current code always uses ‘AES256’]
The fourth field (
vault-id-label) identifies the vault-id label used to encrypt the data. For example using a vault-id of
dev@prompt results in a vault-id-label of ‘dev’ being used.
Note: In the future, the header could change. Anything after the vault id and version can be considered to depend on the vault format version. This includes the cipher id, and any additional fields that could be after that.
The rest of the content of the file is the ‘vaulttext’. The vaulttext is a text armored version of the encrypted ciphertext. Each line will be 80 characters wide, except for the last line which may be shorter.
The vaulttext is a concatenation of the ciphertext and a SHA256 digest with the result ‘hexlifyied’.
‘hexlify’ refers to the
hexlify() method of the Python Standard Library’s binascii module.
hexlify()’ed result of:
- hexlify()’ed string of the salt, followed by a newline (
- hexlify()’ed string of the crypted HMAC, followed by a newline. The HMAC is:
- a RFC2104 style HMAC
- inputs are:
- The AES256 encrypted ciphertext
- A PBKDF2 key. This key, the cipher key, and the cipher IV are generated from:
- the salt, in bytes
- 10000 iterations
- SHA256() algorithm
- the first 32 bytes are the cipher key
- the second 32 bytes are the HMAC key
- remaining 16 bytes are the cipher IV
- inputs are:
- a RFC2104 style HMAC
- hexlify()’ed string of the ciphertext. The ciphertext is:
- AES256 encrypted data. The data is encrypted using:
- AES-CTR stream cipher
- cipher key
- a 128 bit counter block seeded from an integer IV
- the plaintext
- the original plaintext
- padding up to the AES256 blocksize. (The data used for padding is based on RFC5652)