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srptool — GnuTLS SRP tool
srptool [ −flag [value] ...] [ −−opt−name [[=|]value] ...]
Simple program that emulates the programs in the Stanford SRP (Secure Remote Password) libraries using GnuTLS. It is intended for use in places where you don't expect SRP authentication to be the used for system users.
In brief, to use SRP you need to create two files. These are the password file that holds the users and the verifiers associated with them and the configuration file to hold the group parameters (called tpasswd.conf).
−d
number,
−−debug=numberEnable debugging. This option takes an integer number as its argument. The value of number is constrained to being:
in the range 0 through 9999
Specifies the debug level.
−i
number,
−−index=numberspecify the index of the group parameters in tpasswd.conf to use. This option takes an integer number as its argument. The default number for this option is:
1
−u
string,
−−username=stringspecify a username.
−p
string,
−−passwd=stringspecify a password file.
−s
number,
−−salt=numberspecify salt size. This option takes an integer number as its argument.
−−verifyjust verify the password..
Verifies the password provided against the password file.
−v
string,
−−passwd−conf=stringspecify a password conf file..
Specify a filename or a PKCS #11 URL to read the CAs from.
−−create−conf=stringGenerate a password configuration file..
This generates a password configuration file (tpasswd.conf) containing the required for TLS parameters.
−h,
−−helpDisplay usage information and exit.
−!,
−−more−helpPass the extended usage information through a pager.
−v
[{v|c|n}],
−−version[={v|c|n}]Output version of program and exit. The default mode is `v', a simple version. The `c' mode will print copyright information and `n' will print the full copyright notice.
To create tpasswd.conf which holds the
g and n values for SRP protocol (generator and a large
prime), run:
$ srptool −−create−conf /etc/tpasswd.conf
This command will create /etc/tpasswd and will add user 'test' (you
will also be prompted for a password). Verifiers are stored
by default in the way libsrp expects.
$ srptool −−passwd /etc/tpasswd −−passwd−conf /etc/tpasswd.conf −u test
This command will check against a password. If the
password matches the one in /etc/tpasswd you will get an ok.
$ srptool −−passwd /etc/tpasswd −−passwd−conf /etc/tpasswd.conf −−verify −u test
One of the following exit values will be returned:
0
(EXIT_SUCCESS)Successful program execution.
1
(EXIT_FAILURE)The operation failed or the command syntax was not valid.
70
(EX_SOFTWARE)libopts had an internal operational error. Please report it to autogen-users@lists.sourceforge.net. Thank you.