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PAM_GET_ITEM(3) Linux-PAM Manual PAM_GET_ITEM(3)
NAME
pam_get_item - getting PAM informations
SYNOPSIS
#include <security/pam_modules.h>
int pam_get_item(const pam_handle_t *pamh, int item_type, const void **item);
DESCRIPTION
The pam_get_item function allows applications and PAM service modules to access and
retrieve PAM informations of item_type. Upon successful return, item contains a pointer to
the value of the corresponding item. Note, this is a pointer to the actual data and should
not be free()'ed or over-written! The following values are supported for item_type:
PAM_SERVICE
The service name (which identifies that PAM stack that the PAM functions will use to
authenticate the program).
PAM_USER
The username of the entity under whose identity service will be given. That is,
following authentication, PAM_USER identifies the local entity that gets to use the
service. Note, this value can be mapped from something (eg., "anonymous") to something
else (eg. "guest119") by any module in the PAM stack. As such an application should
consult the value of PAM_USER after each call to a PAM function.
PAM_USER_PROMPT
The string used when prompting for a user's name. The default value for this string is
a localized version of "login: ".
PAM_TTY
The terminal name: prefixed by /dev/ if it is a device file; for graphical, X-based,
applications the value for this item should be the $DISPLAY variable.
PAM_RUSER
The requesting user name: local name for a locally requesting user or a remote user
name for a remote requesting user.
Generally an application or module will attempt to supply the value that is most
strongly authenticated (a local account before a remote one. The level of trust in
this value is embodied in the actual authentication stack associated with the
application, so it is ultimately at the discretion of the system administrator.
PAM_RUSER@PAM_RHOST should always identify the requesting user. In some cases,
PAM_RUSER may be NULL. In such situations, it is unclear who the requesting entity is.
PAM_RHOST
The requesting hostname (the hostname of the machine from which the PAM_RUSER entity
is requesting service). That is PAM_RUSER@PAM_RHOST does identify the requesting user.
In some applications, PAM_RHOST may be NULL. In such situations, it is unclear where
the authentication request is originating from.
PAM_AUTHTOK
The authentication token (often a password). This token should be ignored by all
module functions besides pam_sm_authenticate(3) and pam_sm_chauthtok(3). In the former
function it is used to pass the most recent authentication token from one stacked
module to another. In the latter function the token is used for another purpose. It
contains the currently active authentication token.
PAM_OLDAUTHTOK
The old authentication token. This token should be ignored by all module functions
except pam_sm_chauthtok(3).
PAM_CONV
The pam_conv structure. See pam_conv(3).
The following additional items are specific to Linux-PAM and should not be used in
portable applications:
PAM_FAIL_DELAY
A function pointer to redirect centrally managed failure delays. See
pam_fail_delay(3).
PAM_XDISPLAY
The name of the X display. For graphical, X-based applications the value for this item
should be the $DISPLAY variable. This value may be used independently of PAM_TTY for
passing the name of the display.
PAM_XAUTHDATA
A pointer to a structure containing the X authentication data required to make a
connection to the display specified by PAM_XDISPLAY, if such information is necessary.
See pam_xauth_data(3).
PAM_AUTHTOK_TYPE
The default action is for the module to use the following prompts when requesting
passwords: "New UNIX password: " and "Retype UNIX password: ". The example word UNIX
can be replaced with this item, by default it is empty. This item is used by
pam_get_authtok(3).
If a service module wishes to obtain the name of the user, it should not use this
function, but instead perform a call to pam_get_user(3).
Only a service module is privileged to read the authentication tokens, PAM_AUTHTOK and
PAM_OLDAUTHTOK.
RETURN VALUES
PAM_BAD_ITEM
The application attempted to set an undefined or inaccessible item.
PAM_BUF_ERR
Memory buffer error.
PAM_PERM_DENIED
The value of item was NULL.
PAM_SUCCESS
Data was successful updated.
PAM_SYSTEM_ERR
The pam_handle_t passed as first argument was invalid.
SEE ALSO
pam_set_item(3), pam_strerror(3)
Linux-PAM Manual 09/19/2013 PAM_GET_ITEM(3)
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