PAM_SM_AUTHENTICATE - Online Linux Manual PageSection : 3
Updated : 09/03/2021
Source : Linux-PAM Manual
Note : Linux-PAM Manual

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NAMEpam_sm_authenticate − PAM service function for user authentication

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SYNOPSIS#include <security/pam_modules​.h>int pam_sm_authenticate(pam_handle_t *pamh, int flags, int argc, const char **argv);

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DESCRIPTIONThe pam_sm_authenticate function is the service module's implementation of the pam_authenticate(3) interface​. This function performs the task of authenticating the user​. Valid flags, which may be logically OR'd with PAM_SILENT, are: PAM_SILENT Do not emit any messages​. PAM_DISALLOW_NULL_AUTHTOK Return PAM_AUTH_ERR if the database of authentication tokens for this authentication mechanism has a NULL entry for the user​. Without this flag, such a NULL token will lead to a success without the user being prompted​.

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RETURN VALUESPAM_AUTH_ERR Authentication failure​. PAM_CRED_INSUFFICIENT For some reason the application does not have sufficient credentials to authenticate the user​. PAM_AUTHINFO_UNAVAIL The modules were not able to access the authentication information​. This might be due to a network or hardware failure etc​. PAM_SUCCESS The authentication token was successfully updated​. PAM_USER_UNKNOWN The supplied username is not known to the authentication service​. PAM_MAXTRIES One or more of the authentication modules has reached its limit of tries authenticating the user​. Do not try again​.

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SEE ALSOpam(3), pam_authenticate(3), pam_sm_setcred(3), pam_strerror(3), PAM(8) 0

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