1PAM_GET_ITEM(3)                Linux-PAM Manual                PAM_GET_ITEM(3)
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NAME

6       pam_get_item - getting PAM information
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SYNOPSIS

9       #include <security/pam_modules.h>
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11       int pam_get_item(const pam_handle_t *pamh, int item_type,
12                        const void **item);
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DESCRIPTION

15       The pam_get_item function allows applications and PAM service modules
16       to access and retrieve PAM information of item_type. Upon successful
17       return, item contains a pointer to the value of the corresponding item.
18       Note, this is a pointer to the actual data and should not be free()'ed
19       or over-written! The following values are supported for item_type:
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21       PAM_SERVICE
22           The service name (which identifies that PAM stack that the PAM
23           functions will use to authenticate the program).
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25       PAM_USER
26           The username of the entity under whose identity service will be
27           given. That is, following authentication, PAM_USER identifies the
28           local entity that gets to use the service. Note, this value can be
29           mapped from something (eg., "anonymous") to something else (eg.
30           "guest119") by any module in the PAM stack. As such an application
31           should consult the value of PAM_USER after each call to a PAM
32           function.
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34       PAM_USER_PROMPT
35           The string used when prompting for a user's name. The default value
36           for this string is a localized version of "login: ".
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38       PAM_TTY
39           The terminal name: prefixed by /dev/ if it is a device file; for
40           graphical, X-based, applications the value for this item should be
41           the $DISPLAY variable.
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43       PAM_RUSER
44           The requesting user name: local name for a locally requesting user
45           or a remote user name for a remote requesting user.
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47           Generally an application or module will attempt to supply the value
48           that is most strongly authenticated (a local account before a
49           remote one. The level of trust in this value is embodied in the
50           actual authentication stack associated with the application, so it
51           is ultimately at the discretion of the system administrator.
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53           PAM_RUSER@PAM_RHOST should always identify the requesting user. In
54           some cases, PAM_RUSER may be NULL. In such situations, it is
55           unclear who the requesting entity is.
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57       PAM_RHOST
58           The requesting hostname (the hostname of the machine from which the
59           PAM_RUSER entity is requesting service). That is
60           PAM_RUSER@PAM_RHOST does identify the requesting user. In some
61           applications, PAM_RHOST may be NULL. In such situations, it is
62           unclear where the authentication request is originating from.
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64       PAM_AUTHTOK
65           The authentication token (often a password). This token should be
66           ignored by all module functions besides pam_sm_authenticate(3) and
67           pam_sm_chauthtok(3). In the former function it is used to pass the
68           most recent authentication token from one stacked module to
69           another. In the latter function the token is used for another
70           purpose. It contains the currently active authentication token.
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72       PAM_OLDAUTHTOK
73           The old authentication token. This token should be ignored by all
74           module functions except pam_sm_chauthtok(3).
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76       PAM_CONV
77           The pam_conv structure. See pam_conv(3).
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79       The following additional items are specific to Linux-PAM and should not
80       be used in portable applications:
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82       PAM_FAIL_DELAY
83           A function pointer to redirect centrally managed failure delays.
84           See pam_fail_delay(3).
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86       PAM_XDISPLAY
87           The name of the X display. For graphical, X-based applications the
88           value for this item should be the $DISPLAY variable. This value may
89           be used independently of PAM_TTY for passing the name of the
90           display.
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92       PAM_XAUTHDATA
93           A pointer to a structure containing the X authentication data
94           required to make a connection to the display specified by
95           PAM_XDISPLAY, if such information is necessary. See
96           pam_xauth_data(3).
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98       PAM_AUTHTOK_TYPE
99           The default action is for the module to use the following prompts
100           when requesting passwords: "New UNIX password: " and "Retype UNIX
101           password: ". The example word UNIX can be replaced with this item,
102           by default it is empty. This item is used by pam_get_authtok(3).
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104       If a service module wishes to obtain the name of the user, it should
105       not use this function, but instead perform a call to pam_get_user(3).
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107       Only a service module is privileged to read the authentication tokens,
108       PAM_AUTHTOK and PAM_OLDAUTHTOK.
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RETURN VALUES

111       PAM_BAD_ITEM
112           The application attempted to set an undefined or inaccessible item.
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114       PAM_BUF_ERR
115           Memory buffer error.
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117       PAM_PERM_DENIED
118           The value of item was NULL.
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120       PAM_SUCCESS
121           Data was successful updated.
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123       PAM_SYSTEM_ERR
124           The pam_handle_t passed as first argument was invalid.
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SEE ALSO

127       pam_set_item(3), pam_strerror(3)
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131Linux-PAM Manual                  06/08/2020                   PAM_GET_ITEM(3)
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