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In response to a call to pam_setcred(3PAM), the PAM
framework calls pam_sm_setcred() from the modules listed in the pam.conf(4) 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:
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PAM_ESTABLISH_CRED
- Set user credentials for the authentication service.
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PAM_DELETE_CRED
- Delete user credentials associated with the authentication service.
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PAM_REINITIALIZE_CRED
- Reinitialize user credentials.
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PAM_REFRESH_CRED
- Extend lifetime of user credentials.
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PAM_SILENT
- 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(4). 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.
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