Phil Endecott wrote:
Dear Experts,
I'm setting up mod_authn_dbd for the first time (having previously used
the 3rd-party mod_auth_pgsql with apache2.0) and I'm unsure how the
passwords should be encoded in the database. The docs at
http://httpd.apache.org/docs/2.2/mod/mod_authn_dbd.html just say:
"The query must take a single string (typically SQL varchar) argument
(username),
and return a single value (encrypted password)."
Do I have a choice of encryption formats? How do I tell it which format
I have used? (Is there some more documentation somewhere that I have
missed?)
There are four formats that Apache recognizes for passwords.
Note that not all four work on every platform:
1. PLAIN TEXT (i.e. unencrypted) passwords:
Windows, BEOS, & Netware only.
2. CRYPT passwords:
Unix only.
Calls the Unix crypt(3) function with a
randomly-generated 32-bit salt and the password
3. SHA1 passwords:
"{SHA}" + Base64-encoded SHA-1 digest of the password
4. MD5 passwords:
"$apr1$" + the result of an Apache-specific algorithm
using an iterated (1,000 times) MD5 digest of various
combinations of a randomly-generated 32-bit salt
and the password. See source file apr-util/crypto/apr_md5.c
for the details of the algorithm.
The htpasswd program can be used to generate values:
MD5
htpasswd -nbm myName myPassword
myName:$apr1$r31.....$HqJZimcKQFAMYayBlzkrA/
SHA1
htpasswd -nbs myName myPassword
myName:{SHA}VBPuJHI7uixaa6LQGWx4s+5GKNE=
CRYPT
htpasswd -nbd myName myPassword
myName:rqXexS6ZhobKA
openssl can also be used to generate CRYPT and MD5 values
(openssl knows the Apache-specific algorithm). For example:
MD5
openssl passwd -apr1 myPassword
$apr1$qHDFfhPC$nITSVHgYbDAK1Y0acGRnY0
CRYPT
openssl passwd -crypt myPassword
qQ5vTYO3c8dsU
The SHA1 variant is probably the most useful for DBD authentication.
Since the SHA1-hash and Base64-encoding functions are commonly
available, other software can populate a database with encrypted
passwords which are usable by Apache.
-tom-
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