summaryrefslogtreecommitdiff
path: root/doc/man/pam_get_authtok.3
blob: b66b5b598b4ebf55c7994ffea2a13cbc3c837520 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
'\" t
.\"     Title: pam_get_authtok
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.75.2 <http://docbook.sf.net/>
.\"      Date: 11/10/2009
.\"    Manual: Linux-PAM Manual
.\"    Source: Linux-PAM Manual
.\"  Language: English
.\"
.TH "PAM_GET_AUTHTOK" "3" "11/10/2009" "Linux-PAM Manual" "Linux-PAM Manual"
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
pam_get_authtok \- get authentication token
.SH "SYNOPSIS"
.sp
.ft B
.nf
#include <security/pam_ext\&.h>
.fi
.ft
.HP \w'int\ pam_get_authtok('u
.BI "int pam_get_authtok(pam_handle_t\ *" "pamh" ", int\ " "item" ", const\ char\ **" "authtok" ", const\ char\ *" "prompt" ");"
.HP \w'int\ pam_get_authtok_noverify('u
.BI "int pam_get_authtok_noverify(pam_handle_t\ *" "pamh" ", const\ char\ **" "authtok" ", const\ char\ *" "prompt" ");"
.HP \w'int\ pam_get_authtok_verify('u
.BI "int pam_get_authtok_verify(pam_handle_t\ *" "pamh" ", const\ char\ **" "authtok" ", const\ char\ *" "prompt" ");"
.SH "DESCRIPTION"
.PP
The
\fBpam_get_authtok\fR
function returns the cached authentication token, or prompts the user if no token is currently cached\&. It is intended for internal use by Linux\-PAM and PAM service modules\&. Upon successful return,
\fIauthtok\fR
contains a pointer to the value of the authentication token\&. Note, this is a pointer to the
\fIactual\fR
data and should
\fBnot\fR
be
\fIfree()\fR\'ed or over\-written!
.PP
The
\fIprompt\fR
argument specifies a prompt to use if no token is cached\&. If a NULL pointer is given,
\fBpam_get_authtok\fR
uses pre\-defined prompts\&.
.PP
The following values are supported for
\fIitem\fR:
.PP
PAM_AUTHTOK
.RS 4
Returns the current authentication token\&. Called from
\fBpam_sm_chauthtok\fR(3)
\fBpam_get_authtok\fR
will ask the user to confirm the new token by retyping it\&. If a prompt was specified, "Retype" will be used as prefix\&.
.RE
.PP
PAM_OLDAUTHTOK
.RS 4
Returns the previous authentication token when changing authentication tokens\&.
.RE
.PP
The
\fBpam_get_authtok_noverify\fR
function can only be used for changing the password (from
\fBpam_sm_chauthtok\fR(3))\&. It returns the cached authentication token, or prompts the user if no token is currently cached\&. The difference to
\fBpam_get_authtok\fR
is, that this function does not ask a second time for the password to verify it\&. Upon successful return,
\fIauthtok\fR
contains a pointer to the value of the authentication token\&. Note, this is a pointer to the
\fIactual\fR
data and should
\fBnot\fR
be
\fIfree()\fR\'ed or over\-written!
.PP
The
\fBpam_get_authtok_verify\fR
function can only be used to verify a password for mistypes gotten by
\fBpam_get_authtok_noverify\fR(3)\&. This function asks a second time for the password and verify it with the password provided by
\fIauthtok\fR
argument\&. In case of an error, the value of
\fIauthtok\fR
is undefined\&. Else this argument will point to the
\fIactual\fR
data and should
\fBnot\fR
be
\fIfree()\fR\'ed or over\-written!
.SH "OPTIONS"
.PP

\fBpam_get_authtok\fR
honours the following module options:
.PP
\fBtry_first_pass\fR
.RS 4
Before prompting the user for their password, the module first tries the previous stacked module\'s password in case that satisfies this module as well\&.
.RE
.PP
\fBuse_first_pass\fR
.RS 4
The argument
\fBuse_first_pass\fR
forces the module to use a previous stacked modules password and will never prompt the user \- if no password is available or the password is not appropriate, the user will be denied access\&.
.RE
.PP
\fBuse_authtok\fR
.RS 4
When password changing enforce the module to set the new token to the one provided by a previously stacked
\fBpassword\fR
module\&. If no token is available token changing will fail\&.
.RE
.PP
\fBauthtok_type=\fR\fB\fIXXX\fR\fR
.RS 4
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
\fIUNIX\fR
can be replaced with this option, by default it is empty\&.
.RE
.SH "RETURN VALUES"
.PP
PAM_AUTH_ERR
.RS 4
Authentication token could not be retrieved\&.
.RE
.PP
PAM_AUTHTOK_ERR
.RS 4
New authentication could not be retrieved\&.
.RE
.PP
PAM_SUCCESS
.RS 4
Authentication token was successfully retrieved\&.
.RE
.PP
PAM_SYSTEM_ERR
.RS 4
No space for an authentication token was provided\&.
.RE
.PP
PAM_TRY_AGAIN
.RS 4
New authentication tokens mismatch\&.
.RE
.SH "SEE ALSO"
.PP

\fBpam\fR(8)
.SH "STANDARDS"
.PP
The
\fBpam_get_authtok\fR
function is a Linux\-PAM extensions\&.