Updated: 2022/Sep/29

Please read Privacy Policy. It's for your privacy.

OPENPAM_SUBST(3)           Library Functions Manual           OPENPAM_SUBST(3)

NAME
     openpam_subst - substitute PAM item values in a string

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_SUCCESS]       Success.

     [PAM_BAD_ITEM]      Unrecognized or restricted item.

     [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 by
     Dag-Erling Sm/orgrav <des@des.no>.

NetBSD 10.99                     June 27, 2023                    NetBSD 10.99