doveadm-pw (1) - Linux Manuals
doveadm-pw: Dovecot's password hash generator
NAME
doveadm-pw - Dovecot's password hash generatorSYNOPSIS
doveadm [-Dv] pw -ldoveadm [-Dv] pw [-p password] [-r rounds] [-s scheme] [-u user] [-V]
doveadm [-Dv] pw -t hash [-p password] [-u user]
DESCRIPTION
doveadm pw is used to generate password hashes for different password schemes and optionally verify the generated hash.All generated password hashes have a {scheme} prefix, for example {SHA512-CRYPT.HEX}. All passdbs have a default scheme for passwords stored without the {scheme} prefix. The default scheme can be overridden by storing the password with the scheme prefix.
OPTIONS
Global doveadm(1) options:- -D
- Enables verbosity and debug messages.
- -v
- Enables verbosity, including progress counter.
Command specific options:
- -l
-
List all supported password
schemes
and exit successfully.
There are up to three optional password schemes: BLF-CRYPT (Blowfish crypt), SHA256-CRYPTand SHA512-CRYPT. Their availability depends on the system's currently used libc. - -p
password - The plain text password for which the hash should be generated. If no password was given doveadm(1) will prompt interactively for one.
- -r
rounds -
The password
schemes
BLF-CRYPT,
SHA256-CRYPT
and SHA512-CRYPT supports a variable number of encryption rounds. The following table shows the minimum/maximum number of encryption rounds per scheme. When the -r option was omitted the default number of encryption rounds will be applied. Scheme | Minimum | Maximum | Default ---------------------------------------------- BLF-CRYPT | 4 | 31 | 5 SHA256-CRYPT | 1000 | 999999999 | 5000 SHA512-CRYPT | 1000 | 999999999 | 5000
- -s
scheme -
The password
scheme
which should be used to generate the hashed password.
By default the
CRAM-MD5
scheme will be used. It is also possible to append an encoding suffix to the scheme. Supported encoding suffixes are: .b64, .base64 and .hex.
See also http://wiki2.dovecot.org/Authentication/PasswordSchemes for more details about password schemes. - -t
hash - Test if the given password hash matches a given plain text password. The plain text password may be passed using the -p option. When no password was specified, doveadm(1) will prompt interactively for one.
- -u
user -
When the
DIGEST-MD5
scheme is used, also the user name must be given, because the user name is a part of the generated hash. For more information about Digest-MD5 please read also: http://wiki2.dovecot.org/Authentication/Mechanisms/DigestMD5 - -V
- When this option is given, the hashed password will be internally verified. The result of the verification will be shown after the hashed password, enclosed in parenthesis.
EXAMPLE
The first password hash is a DIGEST-MD5 hash for jane.roe [at] example.com. The second password hash is a CRAM-MD5 hash for john.doe [at] example.com.
doveadm pw -s digest-md5 -u jane.roe [at] example.com
Enter new password:
Retype new password:
{DIGEST-MD5}9b9dcb4466233a9307bbc33708dffda0
doveadm pw
Enter new password:
Retype new password:
{CRAM-MD5}913331d8782236a8ecba7764a63aa27b26437fd40ca878d887f11d81245c2c6b