pam_sm_setcred - service provider implementation for pam_setcred

cc [ flag ... ] file ... -lpam [ library ... ]
#include <security/pam_appl.h>
#include <security/pam_modules.h>
int pam_sm_setcred(pam_handle_t *pamh, int flags, int argc,

const char **argv);

In response to a call to pam_setcred(3PAM), the PAM framework calls pam_sm_setcred() from the modules listed in the pam.conf(5) file. The authentication provider supplies the back-end functionality for this interface function.

The pam_sm_setcred() function is called to set the credentials of the current user associated with the authentication handle, pamh. The following flags may be set in the flags field. Note that the first four flags are mutually exclusive:


Set user credentials for the authentication service.


Delete user credentials associated with the authentication service.


Reinitialize user credentials.


Extend lifetime of user credentials.


Authentication service should not generate messages

If no flag is set, PAM_ESTABLISH_CRED is used as the default.

The argc argument represents the number of module options passed in from the configuration file pam.conf(5). argv specifies the module options, which are interpreted and processed by the authentication service. If an unknown option is passed to the module, an error should be logged and the option ignored.

If the PAM_SILENT flag is not set, then pam_sm_setcred() should print any failure status from the corresponding pam_sm_authenticate() function using the conversation function.

The authentication status (success or reason for failure) is saved as module-specific state in the authentication handle by the authentication module. The status should be retrieved using pam_get_data(), and used to determine if user credentials should be set.

Upon successful completion, PAM_SUCCESS should be returned. The following values may also be returned upon error:


Underlying authentication service can not retrieve user credentials.


User credentials have expired.


User unknown to the authentication service.


Failure in setting user credentials.


Ignore underlying authentication module regardless of whether the control flag is required, optional, or sufficient.

See attributes(7) for description of the following attributes:

Interface Stability Stable
MT-Level MT-Safe with exceptions

pam(3PAM), pam_authenticate(3PAM), pam_get_data(3PAM) libpam(3LIB), pam_setcred(3PAM), pam_sm_authenticate(3PAM), pam.conf(5), attributes(7)

The pam_sm_setcred() function is passed the same module options that are used by pam_sm_authenticate().

The interfaces in libpam(3LIB) are MT-Safe only if each thread within the multithreaded application uses its own PAM handle.

If the PAM_REPOSITORY item_type is set and a service module does not recognize the type, the service module does not process any information, and returns PAM_IGNORE. If the PAM_REPOSITORY item_type is not set, a service module performs its default action.

August 19, 2023 OmniOS