AUTH_LOGIN(3)						      Double Precision, Inc.						     AUTH_LOGIN(3)

NAME

       auth_login - Validate a userid and password

SYNOPSIS

	   #include <courierauth.h>

       int rc=auth_login(const char *service, const char *userid, const char *password, int (*callback_func)(struct authinfo *, void *),
			 void *callback_arg);

DESCRIPTION

       auth_login verifies whether userid exists, and whether it's password is correct.  service specifies which so-called "service" is being
       authenticated; like "imap" or "pop3".  service may or may not be used by the Courier authentication library's configured back-end module.

RETURNS

       callback_func will be invoked if auth_login succeeds, and callback_func's return value becomes the return value from auth_login (which
       should be 0, by convention).  callback_func will not be invoked if an error occurs, which is reported by a non-zero return value from
       auth_login. 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.

       The second argument to callback_func will be callback_arg, which is not interpreted by this function in any way. The first argument will be
       a pointer to the following structure:

       Example 1. struct authinfo

	   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;

		} ;

       Description of the above fields:

       address
	   The authenticated login ID.

       sysusername
	   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.

       sysuserid

	   sysuserid may be NULL if sysusername is initialized, otherwise it's a pointer to the account's numeric userid.

       sysgroupid
	   Account's numeric groupid.  sysgroupid is only used when sysusername is NULL.

       fullname
	   This is the account's full name. This field is optional, it may be NULL.

       homedir
	   The account's home directory. This field cannot be NULL.

       maildir
	   The pathname to the account's mailbox. This field is optional, it can be NULL in which case the default location is assumed.

       quota
	   Optional maildir quota on the account's mailbox (and NULL if no quota is set).

       passwd
	   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:

	   o   A traditional triple-DES crypted password, or a MD5+salt-hashed password, as used in Linux.

	   o	"{MD5}" followed by a base64-encoded MD5 hash of the password.

	   o	"{SHA}" followed by a base64-encoded SHA1 hash of the password.

       clearpasswd
	   The account's cleartext password, if available. If the account has an encrypted password defined, this field can be set to NULL.

       options
	   A comma-separated list of miscellaneous account options. See below for more information.

   Account options
       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 "option=value" settings.

       Note
       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.

       The following options are recognized by the various Courier packages:

       Note
       The application is responsible for enforcing all the "disabled" option. An authentication request for service "imap", for example, will
       succeed provided that the userid and the password are valid, even if "disableimap=1" is set. The application's callback_func should check
       for this condition, and return a negative return code.

       disableimap=n
	   If "n" is 1, IMAP access to this account should be disabled.

       disablepop3=n
	   If "n" is 1, POP3 access to this account should be disabled.

       disablewebmail=n
	   If "n" is 1, webmail access to this account should be disabled.

       disableshared=n
	   If "n" is 1, this account should not have access to shared folders or be able to share its own folders with other people.

       group=name
	   This account is a member of access group name. Instead of granting access rights on individual mail folders to individual accounts, the
	   access rights can be granted to an access group "name", and all members of this group get the specified access rights.

	   The access group name "administrators" is a reserved group. All accounts in the administrators group automatically receive all rights
	   to all accessible folders.

	   Note
	   This option may be specified multiple times to specify that the account belongs to multiple account groups.

       sharedgroup=name
	   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.

	   For technical reasons, group names may not include comma, tab, "/" or "|" characters.

SEE ALSO

       authlib(3)[1], auth_generic(3)[2], auth_getuserinfo(3)[3], auth_enumerate(3)[4], auth_passwd(3)[5], auth_getoption(3)[6].

NOTES

	1. authlib(3)
	   authlib.html

	2. auth_generic(3)
	   auth_generic.html

	3. auth_getuserinfo(3)
	   auth_getuserinfo.html

	4. auth_enumerate(3)
	   auth_enumerate.html

	5. auth_passwd(3)
	   auth_passwd.html

	6. auth_getoption(3)
	   auth_getoption.html

Double Precision, Inc.						    08/23/2008							     AUTH_LOGIN(3)