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

6       pam_set_data - set module internal data
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SYNOPSIS

9       #include <security/pam_modules.h>
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11       int pam_set_data(pam_handle_t *pamh, const char *module_data_name,
12                        void *data,
13                        void (*cleanup)(pam_handle_t *pamh, void *data, int error_status));
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DESCRIPTION

16       The pam_set_data function associates a pointer to an object with the
17       (hopefully) unique string module_data_name in the PAM context specified
18       by the pamh argument.
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20       PAM modules may be dynamically loadable objects. In general such files
21       should not contain static variables. This function and its counterpart
22       pam_get_data(3), provide a mechanism for a module to associate some
23       data with the handle pamh. Typically a module will call the
24       pam_set_data function to register some data under a (hopefully) unique
25       module_data_name. The data is available for use by other modules too
26       but not by an application. Since this functions stores only a pointer
27       to the data, the module should not modify or free the content of it.
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29       The function cleanup() is associated with the data and, if non-NULL, it
30       is called when this data is over-written or following a call to
31       pam_end(3).
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33       The error_status argument is used to indicate to the module the sort of
34       action it is to take in cleaning this data item. As an example,
35       Kerberos creates a ticket file during the authentication phase, this
36       file might be associated with a data item. When pam_end(3) is called by
37       the module, the error_status carries the return value of the
38       pam_authenticate(3) or other libpam function as appropriate. Based on
39       this value the Kerberos module may choose to delete the ticket file
40       (authentication failure) or leave it in place.
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42       The error_status may have been logically OR'd with either of the
43       following two values:
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45       PAM_DATA_REPLACE
46           When a data item is being replaced (through a second call to
47           pam_set_data) this mask is used. Otherwise, the call is assumed to
48           be from pam_end(3).
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50       PAM_DATA_SILENT
51           Which indicates that the process would prefer to perform the
52           cleanup() quietly. That is, discourages logging/messages to the
53           user.
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RETURN VALUES

56       PAM_BUF_ERR
57           Memory buffer error.
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59       PAM_SUCCESS
60           Data was successful stored.
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62       PAM_SYSTEM_ERR
63           A NULL pointer was submitted as PAM handle or the function was
64           called by an application.
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SEE ALSO

67       pam_end(3), pam_get_data(3), pam_strerror(3)
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71Linux-PAM Manual                  05/18/2017                   PAM_SET_DATA(3)
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