Ubuntu Manpage: auth.conf - Configuration of authentication mechanisms for web interface of Sympa

NAME

       auth.conf - Configuration of authentication mechanisms for web interface of Sympa

DESCRIPTION

The auth.conf configuration file defines authentication mechanisms for web interface of
Sympa.

auth.conf structure
Each paragraph starts with one of the names "user_table", "ldap", "generic_sso" or "cas".

The auth.conf file contains directives in the following format:

name
keyword value
keyword value
...

Comments start with the "#" character at the beginning of a line.

Empty lines are also considered as comments and are ignored at the beginning. After the
first paragraph, they are considered as paragraph separators. There should only be one
directive per line, but their order in the paragraph is of no importance.

Succeeding subsections describe available parameters in each paragraph.

"user_table" paragraph
This paragraph is related to Sympa internal authentication by email and password.
Information of users are stored in "user_table" database table. This is the simplest one.

"regexp" regexp
"negative_regexp"
Perl regular expressions applied on an email address provided, to select or block this
authentication mechanism for a subset of email addresses.

"ldap" paragraph
This paragraph allows one to login to Sympa using data taken from an LDAP directory. Login
is done in two steps:

• User provide a user ID or an email address, with a password. These are used to
retrieve their distinguished name (DN) in the LDAP directory.

• The email attribute is extracted from the directory entry corresponding to the found
DN.

Here is how to configure the LDAP authentication:

"regexp"
"negative_regexp"
Same as in the "user_table" paragraph: If an email address is provided (this does not
apply to the user ID), then the regular expression will be applied to find out if the
LDAP directory can be used to authenticate a subset of users.

"host"
This keyword is mandatory. It is the domain name used in order to bind to the
directory and then to extract information. You must mention the port number after the
server name. Server replication is supported by listing several servers separated by
commas (",").

Example:

host ldap.univ-rennes1.fr:389

host ldap0.university.com:389,ldap1.university.com:389,ldap2.university.com:389

"timeout"
It corresponds to the time limit in the search operation. A "timelimit" that restricts
the maximum time (in seconds) allowed for a search. A value of 0 (the default) means
that no time limit will be requested.

"suffix"
The root of the DIT (directory information tree). The DN that is the base object entry
relative to which the search is to be performed.

Example:

dc=university,dc=fr

"bind_dn"
If anonymous bind is not allowed on the LDAP server, a DN and password can be used.

"bind_password"
This password is used, combined with the "bind_dn" above.

"get_dn_by_uid_filter"
Defines the search filter corresponding to the "ldap_uid". (RFC 2254 compliant). If
you want to apply the filter on the user, use the variable "[sender]". It will work
with every type of authentication (user ID, "alternate_email", ...).

Example:

(Login = [sender])

(|(ID = [sender])(UID = [sender]))

"get_dn_by_email_filter"
Defines the search filter corresponding to the email addresses (canonic and
alternative --- this is RFC 2254 compliant). If you want to apply the filter on the
user, use the variable "[sender]". It will work with every type of authentication
(user ID, "alternate_email"..).

Example: a person is described by

dn: cn=Fabrice Rafart, ou=Siege, o=MaSociete, c=FR
objectClass: person
cn: Fabrice Rafart
title: Network Responsible
o: Siege
ou: Data processing
telephoneNumber: 01-00-00-00-00
facsimileTelephoneNumber: 01-00-00-00-00
l: Paris
country: France
uid: frafart
mail: Fabrice.Rafart@MaSociete.fr
alternate_email: frafart@MaSociete.fr
alternate: rafart@MaSociete.fr

The filters can be:

(mail = [sender])

(| (mail = [sender])(alternate_email = [sender]) )

(| (mail = [sender])(alternate_email = [sender])(alternate = [sender]) )

"email_attribute"
The name of the attribute for the canonic email in your directory: for instance
"mail", "canonic_email", "canonic_address", ... In the previous example, the canonic
email is "mail".

"alternative_email_attribute"
The name of the attribute for the alternate email in your directory: for instance
"alternate_email", "mailalternateaddress", ... You make a list of these attributes
separated by commas (",").

With this list, Sympa creates a cookie which contains various information: Whether the
user is authenticated via LDAP or not, their alternate email. Storing the alternate
email is interesting when you want to canonify your preferences and subscriptions,
that is to say you want to use a unique address in "user_table" and
"subscriber_table", which is the canonic email.

"scope"
Default value: "sub"

By default, the search is performed on the whole tree below the specified base object.
This may be changed by specifying a scope:

"base"
Search only the base object,

"one"
Search the entries immediately below the base object,

"sub"
Search the whole tree below the base object. This is the default.

"authentication_info_url"
Defines the URL of a document describing LDAP password management. When hitting
Sympa's "Send me a password" button, LDAP users will be redirected to this URL.

TLS parameters

Following parameters are used to provide LDAPS (LDAP over TLS/SSL):

"use_ssl" (OBSOLETE)
If set to 1, connection to the LDAP server will use LDAPS (LDAP over TLS/SSL).

Obsoleted as of Sympa 6.2.15. Use "use_tls" instead.

"use_tls"
Default value: "none"

"ldaps"
Use LDAPS (LDAP over TLS/SSL),

"starttls"
Use StartTLS,

"none"
TLS (SSL) is disabled.

"ssl_version"
Default value: "tlsv1"

This defines the version of the TLS/SSL protocol to use. Possible values are "sslv2",
"sslv3", "tlsv1", "tlsv1_1" and "tlsv1_2".

"ssl_ciphers"
Specify which subset of cipher suites are permissible for this connection, using the
standard OpenSSL string format. The default value of Net::LDAPS for ciphers is "ALL",
which permits all ciphers, even those that do not encrypt!

"ssl_cert"
Path to client certificate.

Introduced on Sympa 6.2.

"ssl_key"
Path to the secret key of client certificate.

Introduced on Sympa 6.2.

"ca_verify"
"none", "optional" or "required". If set to "none", will never verify server
certificate. Latter two need appropriate "ca_path" and/or "ca_file" settings.

Introduced on Sympa 6.2.

"ca_path"
Path to directory store of CA certificates.

Introduced on Sympa 6.2.

"ca_file"
Path to file store of CA certificates.

Introduced on Sympa 6.2.

"generic_sso" paragraph
"regexp"
"negative_regexp"
See "user_table" paragraph.

"service_name"
This is the SSO service name that will be offered to the user in the login banner
menu.

"service_id"
This service ID is used as a parameter by Sympa to refer to the SSO service (instead
of the service name).

A corresponding URL on the local web server should be protected by the SSO system;
this URL would look like "http://yourhost.yourdomain/sympa/sso_login/inqueue" if the
"service_id" is ""inqueue"".

"http_header_list"
Sympa gets user attributes from environment variables coming from the web server.
These variables are then cached in the "user_table" database table for later use in
authorization scenarios (in structure). You can define a comma-separated list of
header field names.

"http_header_prefix"
Only environment variables starting with the defined prefix will be kept. Another
option is to list HTTP header fields explicitly using "http_header_list" parameter.

"email_http_header"
This parameter defines the environment variable that will contain the authenticated
user's email address.

"http_header_value_separator"
Default: ";"

User attributes may be multi-valued (including the user email address. This parameter
defines the values separator character(s).

"logout_url"
This optional parameter allows one to specify the SSO logout URL. If defined, Sympa
will redirect the user to this URL after the Sympa logout has been performed.

netID mapping parameters

The following parameters define how Sympa can check the user email address, either
provided by the SSO or by the user themselves:

"internal_email_by_netid"
If set to 1, this parameter makes Sympa use its "netidmap" table to associate net IDs
to user email addresses.

"netid_http_header"
This parameter defines the environment variable that will contain the user's
identifier. This net ID will then be associated with an email address provided by the
user.

"force_email_verify"
If set to 1, this parameter makes Sympa check the user's email address. If the email
address was not provided by the authentication module, then the user is requested to
provide a valid email address.

LDAP parameters for generic SSO

The following parameters define how Sympa can retrieve the user email address; these are
useful only in case the "email_http_header" entry was not defined:

"ldap_host"
The LDAP host Sympa will connect to fetch user email. The "ldap_host" include the port
number and it may be a comma separated list of redundant hosts.

"ldap_bind_dn"
The DN used to bind to this server. Anonymous bind is used if this parameter is not
defined.

"ldap_bind_password"
The password used unless anonymous bind is used.

"ldap_suffix"
The LDAP suffix used when searching user email.

"ldap_scope"
The scope used when searching user email. Possible values are "sub", "base" and "one".

"ldap_get_email_by_uid_filter"
The filter used to perform the email search. It can refer to any environment variables
inherited from the SSO module, as shown below.

Example:

ldap_get_email_by_uid_filter (mail=[SSL_CLIENT_S_DN_Email])

"ldap_email_attribute"
The attribute name to be used as user canonical email. In the current version of
Sympa, only the first value returned by the LDAP server is used.

"ldap_timeout"
The time out for the search.

TLS parameters

To support LDAPS (LDAP over SSL/TLS), corresponding parameters in "ldap" paragraph may
also be used for "generic_sso".

"cas" paragraph
Note that Sympa will act as a CAS client to validate CAS tickets. During this exchange,
Sympa will check the CAS server X.509 certificate. Therefore you should ensure that the
certificate authority of the CAS server is known by Sympa ; this should be configured
through the cafile or capath sympa.conf configuration parameters.

"regexp"
"negative_regexp"
See "user_table" paragraph.

"auth_service_name"
The authentication service name. Note that it is used as an identifier in the code; it
should therefore be made of alphanumeric characters only, with no space.

"auth_service_friendly_name"
If defined, this string is proposed on the web login banner.

"host" (OBSOLETE)
This parameter has been replaced by "base_url" parameter.

"base_url"
The base URL of the CAS server.

"non_blocking_redirection"
"on" or "off". Default value: "on"

This parameter only concerns the first access to Sympa services by a user, it
activates or not the non blocking redirection to the related CAS server to check
automatically if the user as been previously authenticated with this CAS server. The
redirection to CAS is used with the CGI parameter "gateway=1" that specifies to CAS
server to always redirect the user to the original URL, but just check if the user is
logged. If active, the SSO service is effective and transparent, but in case the CAS
server is out of order, the access to Sympa services is impossible.

"login_uri" (OBSOLETE)
This parameter has been replaced by the "login_path" parameter.

"login_path" (OPTIONAL)
The login service path.

"check_uri" (OBSOLETE)
This parameter has been replaced by the "service_validate_path" parameter.

"service_validate_path" (OPTIONAL)
The ticket validation service path.

"logout_uri" (OBSOLETE)
This parameter has been replaced by the "logout_path" parameter.

"logout_path" (OPTIONAL)
The logout service path.

"proxy_path" (OPTIONAL)
The proxy service path, only used by the Sympa SOAP server.

"proxy_validate_path" (OPTIONAL)
The proxy validate service path, only used by the Sympa SOAP server.

LDAP parameters for CAS

"ldap_host"
The LDAP host Sympa will connect to fetch user email when user uid is return by CAS
service. The "ldap_host" includes the port number and it may be a comma separated list
of redundant hosts.

"ldap_bind_dn"
The DN used to bind to this server. Anonymous bind is used if this parameter is not
defined.

"ldap_bind_password"
The password used unless anonymous bind is used.

"ldap_suffix"
The LDAP suffix used when searching user email.

"ldap_scope"
The scope used when searching user email. Possible values are "sub", "base" and "one".

"ldap_get_email_by_uid_filter"
The filter used to perform the email search.

"ldap_email_attribute"
The attribute name to be used as user canonical email. In the current version of
Sympa, only the first value returned by the LDAP server is used.

"ldap_timeout"
The time out for the search.

TLS parameters

To support LDAPS (LDAP over SSL/TLS), corresponding parameters in ldap paragraph may also
be used for cas.

FILES

       $DEFAULTDIR/auth.conf
           Distribution default.  This file should not be edited.

       $SYSCONFDIR/auth.conf
       $SYSCONFDIR/<robot name>/auth.conf
           Configuration files for site-wide default and each robot.

HISTORY

       Descriptions of parameters were originally taken from the chapter "Authentication" in
       Sympa, Mailing List Management Software - Reference manual, written by Serge Aumont, Soji
       Ikeda, Olivier Salauen and David Verdin.

NAME

DESCRIPTION

FILES

SEE ALSO

HISTORY