OPENPAM_SUBST(3)					   BSD Library Functions Manual 					  OPENPAM_SUBST(3)

NAME

     openpam_subst -- substitute PAM item values in a string

LIBRARY

     Pluggable Authentication Module Library (libpam, -lpam)

SYNOPSIS

     #include <sys/types.h>
     #include <security/pam_appl.h>
     #include <security/openpam.h>

     int
     openpam_subst(const pam_handle_t *pamh, char *buf, size_t *bufsize, const char *template);

DESCRIPTION

     The openpam_subst function expands a string, substituting PAM item values for all occurrences of specific substitution codes.  The template
     argument points to the initial string.  The result is stored in the buffer pointed to by the buf argument; the bufsize argument specifies the
     size of that buffer.  The actual size of the resulting string, including the terminating NUL character, is stored in the location pointed to
     by the bufsize argument.

     If buf is NULL, or if the buffer is too small to hold the expanded string, bufsize is updated to reflect the amount of space required to hold
     the entire string, and openpam_subst returns PAM_TRY_AGAIN.

     If openpam_subst fails for any other reason, the bufsize argument is untouched, but part of the buffer may still have been overwritten.

     Substitution codes are introduced by a percent character and correspond to PAM items:

     %H 		 Replaced by the current value of the PAM_RHOST item.

     %h 		 Replaced by the current value of the PAM_HOST item.

     %s 		 Replaced by the current value of the PAM_SERVICE item.

     %t 		 Replaced by the current value of the PAM_TTY item.

     %U 		 Replaced by the current value of the PAM_RUSER item.

     %u 		 Replaced by the current value of the PAM_USER item.

RETURN VALUES

     The openpam_subst function returns one of the following values:

     [PAM_SYSTEM_ERR]	 System error.

     [PAM_TRY_AGAIN]	 Try again.

SEE ALSO

     pam(3), pam_get_authtok(3), pam_get_item(3), pam_get_user(3), pam_strerror(3)

STANDARDS

     The openpam_subst function is an OpenPAM extension.

AUTHORS

     The openpam_subst function and this manual page were developed for the FreeBSD Project by Dag-Erling Smorgrav <des@FreeBSD.org>.

BSD
								 December 18, 2011							       BSD