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132 lines
4.0 KiB
Plaintext
132 lines
4.0 KiB
Plaintext
SHA-512 OpenLDAP support
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------------------------
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Based on SHA2 implementation by Aaron D. Gifford (http://www.aarongifford.com/), also used in OpenBSD.
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Adapted for OpenLDAP use by Jeff Turner <jeff@atlassian.com>
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Distributed under open source BSD license - see code for details.
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slapd-sha2.c provides support for SHA-512, SHA-384 and SHA-256 hashed passwords in
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OpenLDAP. For instance, one could have the LDAP attribute:
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userPassword: {SHA512}vSsar3708Jvp9Szi2NWZZ02Bqp1qRCFpbcTZPdBhnWgs5WtNZKnvCXdhztmeD2cmW192CF5bDufKRpayrW/isg==
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or:
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userPassword: {SHA384}WKd1ukESvjAFrkQHznV9iP2nHUBJe7gCbsrFTU4//HIyzo3jq1rLMK45dg/ufFPt
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or:
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userPassword: {SHA256}K7gNU3sdo+OL0wNhqoVWhr3g6s1xYv72ol/pe/Unols=
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all of which encode the password 'secret'.
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Building
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--------
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1) Obtain the OpenLDAP source, eg. 'apt-get source slapd'. Really we
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only want the headers, but there doesn't seem to be a Debian package
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with them.
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2) Customize the OPENLDAP variable in Makefile to point to the OpenLDAP
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source root.
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For initial testing you might also want to edit CCFLAGS to define
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SLAPD_SHA2_DEBUG, which enables logging to stderr (don't leave this on
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in production, as it prints passwords in cleartext).
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3) Run 'make' to produce slapd-sha2.so
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4) Copy slapd-sha2.so somewhere permanent.
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4) Edit your slapd.conf (eg. /etc/ldap/slapd.conf), and add:
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moduleload ...path/to/slapd-sha2.so
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5) Restart slapd.
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The {SHA512} scheme should now be recognised.
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Testing
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-------
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A quick way to test whether it's working is to customize the rootdn and
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rootpw in slapd.conf, eg:
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rootdn "cn=admin,dc=example,dc=com"
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# This encrypts the string 'secret'
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rootpw {SHA256}K7gNU3sdo+OL0wNhqoVWhr3g6s1xYv72ol/pe/Unols=
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Then to test, run something like:
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ldapsearch -b "dc=example,dc=com" -D "cn=admin,dc=example,dc=com" -x -w secret
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-- Test hashes:
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Test hashes can be generated with openssl:
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$ echo -n "secret" | openssl dgst -sha256 -binary | openssl enc -base64
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K7gNU3sdo+OL0wNhqoVWhr3g6s1xYv72ol/pe/Unols=
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$ echo -n "secret" | openssl dgst -sha384 -binary | openssl enc -base64
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WKd1ukESvjAFrkQHznV9iP2nHUBJe7gCbsrFTU4//HIyzo3jq1rLMK45dg/ufFPt
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$ echo -n "secret" | openssl dgst -sha512 -binary | openssl enc -base64
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vSsar3708Jvp9Szi2NWZZ02Bqp1qRCFpbcTZPdBhnWgs5WtNZKnvCXdhztmeD2cm
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W192CF5bDufKRpayrW/isg==
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(join those lines up to form the full hash)
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Alternatively we could modify an existing user's password with
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ldapmodify, and then test binding as that user:
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$ ldapmodify -D "cn=admin,dc=example,dc=com" -x -W
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Enter LDAP Password:
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dn: uid=jturner,ou=People,dc=example,dc=com
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changetype: modify
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replace: userPassword
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userPassword: {SHA512}vSsar3708Jvp9Szi2NWZZ02Bqp1qRCFpbcTZPdBhnWgs5WtNZKnvCXdhztmeD2cmW192CF5bDufKRpayrW/isg==
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modifying entry "uid=jturner,ou=People,dc=example,dc=com"
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$ ldapsearch -b "dc=example,dc=com" -D "uid=jturner,ou=People,dc=example,dc=com" -x -w secret
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Debugging
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---------
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To see what's going on, recompile with SLAPD_SHA2_DEBUG (use the
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commented-out CCFLAGS in Makefile), and then run slapd from the console
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to see stderr:
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$ sudo /etc/init.d/slapd stop
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Stopping OpenLDAP: slapd.
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$ sudo /usr/sbin/slapd -f /etc/ldap/slapd.conf -h ldap://localhost:389 -d 256
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@(#) $OpenLDAP$
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buildd@palmer:/build/buildd/openldap2.3-2.4.9/debian/build/servers/slapd
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/etc/ldap/slapd.conf: line 123: rootdn is always granted unlimited privileges.
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/etc/ldap/slapd.conf: line 140: rootdn is always granted unlimited privileges.
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slapd starting
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...
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Validating password
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Password to validate: secret
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Hashes to: K7gNU3sdo+OL0wNhqoVWhr3g6s1xYv72ol/pe/Unols=
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Stored password scheme: {SHA256}
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Stored password value: K7gNU3sdo+OL0wNhqoVWhr3g6s1xYv72ol/pe/Unols=
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-> Passwords match
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conn=0 op=0 BIND dn="cn=admin,dc=example,dc=com" mech=SIMPLE ssf=0
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conn=0 op=0 RESULT tag=97 err=0 text=
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conn=0 op=1 SRCH base="dc=example,dc=com" scope=2 deref=0 filter="(objectClass=*)"
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conn=0 fd=12 closed (connection lost)
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Origin
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------
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Based on code maintained at:
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http://confluence.atlassian.com/display/JIRAEXT/OpenLDAP+support+for+SHA-2+(SHA-256%2C+SHA-384%2C+SHA-512)+and+atlassian-sha1+passwords
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