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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | SEE ALSO | COLOPHON |
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PAM_SM_CHAUTHTOK(3) Linux-PAM Manual PAM_SM_CHAUTHTOK(3)
pam_sm_chauthtok - PAM service function for authentication token
management
#include <security/pam_modules.h>
int pam_sm_chauthtok(pam_handle_t *pamh, int flags, int argc,
const char **argv);
The pam_sm_chauthtok function is the service module's
implementation of the pam_chauthtok(3) interface.
This function is used to (re-)set the authentication token of the
user.
Valid flags, which may be logically OR'd with PAM_SILENT, are:
PAM_SILENT
Do not emit any messages.
PAM_CHANGE_EXPIRED_AUTHTOK
This argument indicates to the module that the user's
authentication token (password) should only be changed if it
has expired. This flag is optional and must be combined with
one of the following two flags. Note, however, the following
two options are mutually exclusive.
PAM_PRELIM_CHECK
This indicates that the modules are being probed as to their
ready status for altering the user's authentication token. If
the module requires access to another system over some network
it should attempt to verify it can connect to this system on
receiving this flag. If a module cannot establish it is ready
to update the user's authentication token it should return
PAM_TRY_AGAIN, this information will be passed back to the
application.
If the control value sufficient is used in the password stack,
the PAM_PRELIM_CHECK section of the modules following that
control value is not always executed.
PAM_UPDATE_AUTHTOK
This informs the module that this is the call it should change
the authorization tokens. If the flag is logically OR'd with
PAM_CHANGE_EXPIRED_AUTHTOK, the token is only changed if it
has actually expired.
The PAM library calls this function twice in succession. The first
time with PAM_PRELIM_CHECK and then, if the module does not return
PAM_TRY_AGAIN, subsequently with PAM_UPDATE_AUTHTOK. It is only on
the second call that the authorization token is (possibly)
changed.
PAM_AUTHTOK_ERR
The module was unable to obtain the new authentication token.
PAM_AUTHTOK_RECOVERY_ERR
The module was unable to obtain the old authentication token.
PAM_AUTHTOK_LOCK_BUSY
Cannot change the authentication token since it is currently
locked.
PAM_AUTHTOK_DISABLE_AGING
Authentication token aging has been disabled.
PAM_PERM_DENIED
Permission denied.
PAM_TRY_AGAIN
Preliminary check was unsuccessful. Signals an immediate
return to the application is desired.
PAM_SUCCESS
The authentication token was successfully updated.
PAM_USER_UNKNOWN
User unknown to password service.
pam(3), pam_chauthtok(3), pam_sm_chauthtok(3), pam_strerror(3),
PAM(8)
This page is part of the linux-pam (Pluggable Authentication
Modules for Linux) project. Information about the project can be
found at ⟨http://www.linux-pam.org/⟩. If you have a bug report
for this manual page, see ⟨//www.linux-pam.org/⟩. This page was
obtained from the project's upstream Git repository
⟨https://github.com/linux-pam/linux-pam.git⟩ on 2023-12-22. (At
that time, the date of the most recent commit that was found in
the repository was 2023-12-18.) If you discover any rendering
problems in this HTML version of the page, or you believe there is
a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
[email protected]
Linux-PAM Manual 12/22/2023 PAM_SM_CHAUTHTOK(3)
Pages that refer to this page: pam_get_authtok(3), pam_get_item(3), pam_set_item(3), pam_sm_acct_mgmt(3), pam_sm_chauthtok(3), pam_debug(8)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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