userdb: Allow "+", ":", and "_" in usernames.

[hcoop/debian/courier-authlib.git] / auth_login.3

.\"  <!-- $Id: auth_login.sgml,v 1.3 2007/04/01 00:21:34 mrsam Exp $ -->
.\"  <!-- Copyright 2004 Double Precision, Inc.  See COPYING for -->
.\"  <!-- distribution information. -->
.\"     Title: auth_login
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets v1.72.0 <http://docbook.sf.net/>
.\"      Date: 04/06/2007
.\"    Manual: Double Precision, Inc.
.\"    Source: Double Precision, Inc.
.\"
.TH "AUTH_LOGIN" "3" "04/06/2007" "Double Precision, Inc." "Double Precision, Inc."
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.SH "NAME"
auth_login \- Validate a userid and password
.SH "SYNOPSIS"
.sp
.RS 4
.nf
#include <courierauth.h>
.fi
.RE
.HP 18
.BI "int rc=auth_login(const\ char\ *" "service" ", const\ char\ *" "userid" ", const\ char\ *" "password" ", int\ (*" "callback_func" ")(struct\ authinfo\ *,\ void\ *), void\ *" "callback_arg" ");"
.SH "DESCRIPTION"
.PP

\fBauth_login\fR
verifies whether
\fIuserid\fR
exists, and whether it's
\fIpassword\fR
is correct.
\fIservice\fR
specifies which so\-called "service" is being authenticated; like
\(lqimap\(rq
or
\(lqpop3\(rq.
\fIservice\fR
may or may not be used by the Courier authentication library's configured back\-end module.
.SH "RETURNS"
.PP

\fBcallback_func\fR
will be invoked if
\fBauth_login\fR
succeeds, and
\fBcallback_func\fR's return value becomes the return value from
\fBauth_login\fR
(which should be 0, by convention).
\fBcallback_func\fR
will not be invoked if an error occurs, which is reported by a non\-zero return value from
\fBauth_login\fR. By convention, a positive return value indicates an internal, temporary failure, such as the authentication daemon process not running; a negative return value indicates that this request was processed, but it failed.
.PP
The second argument to
\fBcallback_func\fR
will be
\fBcallback_arg\fR, which is not interpreted by this function in any way. The first argument will be a pointer to the following structure:
\fBExample\ 1.\ struct authinfo\fR
.sp
.RS 4
.nf
struct authinfo {
	const char *sysusername;
	const uid_t *sysuserid;
	gid_t sysgroupid;
	const char *homedir;

	const char *address;
	const char *fullname;
	const char *maildir;
	const char *quota;
	const char *passwd;
	const char *clearpasswd;

	const char *options;

	} ;
.fi
.RE
.PP
Description of the above fields:
.PP
address
.RS 4
The authenticated login ID.
.RE
.PP
sysusername
.RS 4
The authenticated account's userid and groupid can be looked up in the password file using
address. If this field is
NULL, obtain the userid and the groupid from
sysuserid
and
sysgroupid.
.RE
.PP
sysuserid
.RS 4

sysuserid
may be
NULL
if
sysusername
is initialized, otherwise it's a pointer to the account's numeric userid.
.RE
.PP
sysgroupid
.RS 4
Account's numeric groupid.
sysgroupid
is only used when
sysusername
is
NULL.
.RE
.PP
fullname
.RS 4
This is the account's full name. This field is optional, it may be
NULL.
.RE
.PP
homedir
.RS 4
The account's home directory. This field cannot be
NULL.
.RE
.PP
maildir
.RS 4
The pathname to the account's mailbox. This field is optional, it can be
NULL
in which case the default location is assumed.
.RE
.PP
quota
.RS 4
Optional maildir quota on the account's mailbox (and
NULL
if no quota is set).
.RE
.PP
passwd
.RS 4
The account's encrypted password, if available. If the account has a cleartext password defined, this field can be set to
NULL. The encrypted password can take several formats:
.RS 4
\h'-04'\(bu\h'+03'A traditional triple\-DES crypted password, or a MD5+salt\-hashed password, as used in Linux.
.RE
.RS 4
\h'-04'\(bu\h'+03'
\(lq{MD5}\(rq
followed by a base64\-encoded MD5 hash of the password.
.RE
.RS 4
\h'-04'\(bu\h'+03'
\(lq{SHA}\(rq
followed by a base64\-encoded SHA1 hash of the password.
.RE
.RE
.PP
clearpasswd
.RS 4
The account's cleartext password, if available. If the account has an encrypted password defined, this field can be set to
NULL.
.RE
.PP
options
.RS 4
A comma\-separated list of miscellaneous account options. See below for more information.
.RE
.SS "Account options"
.PP
Depending on the configuration of the Courier authentication library, accounts may have individual options associated with them. If the authentication library configuration does not implement account options, the option string will be
NULL. Otherwise it will be a comma\-separated list of
\(lq\fIoption\fR=\fIvalue\fR\(rq
settings.
.sp
.it 1 an-trap
.nr an-no-space-flag 1
.nr an-break-flag 1
.br
\fBNote\fR
.PP
This is the account option implementation that's used by Courier, Courier\-IMAP, and SqWebMail packages. Some of the following information is obviously not applicable for a particular package. The inapplicable bits should be obvious.
.PP
The following options are recognized by the various Courier packages:
.sp
.it 1 an-trap
.nr an-no-space-flag 1
.nr an-break-flag 1
.br
\fBNote\fR
.PP
The application is responsible for enforcing all the
\(lqdisabled\(rq
option. An authentication request for service
\(lqimap\(rq, for example, will succeed provided that the userid and the password are valid, even if
\(lqdisableimap=1\(rq
is set. The application's
\fBcallback_func\fR
should check for this condition, and return a negative return code.
.PP
disableimap=\fIn\fR
.RS 4
If "n" is 1, IMAP access to this account should be disabled.
.RE
.PP
disablepop3=\fIn\fR
.RS 4
If "n" is 1, POP3 access to this account should be disabled.
.RE
.PP
disablewebmail=\fIn\fR
.RS 4
If "n" is 1, webmail access to this account should be disabled.
.RE
.PP
disableshared=\fIn\fR
.RS 4
If "n" is 1, this account should not have access to shared folders or be able to share its own folders with other people.
.RE
.PP
group=\fIname\fR
.RS 4
This account is a member of access group
\fIname\fR. Instead of granting access rights on individual mail folders to individual accounts, the access rights can be granted to an access group
\(lqname\(rq, and all members of this group get the specified access rights.
.sp
The access group name
\(lqadministrators\(rq
is a reserved group. All accounts in the
administrators
group automatically receive all rights to all accessible folders.
.sp
.it 1 an-trap
.nr an-no-space-flag 1
.nr an-break-flag 1
.br
\fBNote\fR
This option may be specified multiple times to specify that the account belongs to multiple account groups.
.RE
.PP
sharedgroup=\fIname\fR
.RS 4
Append "name" to the name of the top level virtual shared folder index file. This setting restricts which virtual shared folders this account could possibly access (and that's on top of whatever else the access control lists say). See the virtual shared folder documentation for more information.
.sp
For technical reasons, group names may not include comma, tab, "/" or "|" characters.
.RE
.SH "SEE ALSO"
.PP

\fI\fBauthlib\fR(3)\fR\&[1],
\fI\fBauth_generic\fR(3)\fR\&[2],
\fI\fBauth_getuserinfo\fR(3)\fR\&[3],
\fI\fBauth_enumerate\fR(3)\fR\&[4],
\fI\fBauth_passwd\fR(3)\fR\&[5],
\fI\fBauth_getoption\fR(3)\fR\&[6].
.SH "REFERENCES"
.IP " 1." 4
\fBauthlib\fR(3)
.RS 4
\%authlib.html
.RE
.IP " 2." 4
\fBauth_generic\fR(3)
.RS 4
\%auth_generic.html
.RE
.IP " 3." 4
\fBauth_getuserinfo\fR(3)
.RS 4
\%auth_getuserinfo.html
.RE
.IP " 4." 4
\fBauth_enumerate\fR(3)
.RS 4
\%auth_enumerate.html
.RE
.IP " 5." 4
\fBauth_passwd\fR(3)
.RS 4
\%auth_passwd.html
.RE
.IP " 6." 4
\fBauth_getoption\fR(3)
.RS 4
\%auth_getoption.html
.RE