1PAM_SM_AUTHENTICATE(3)         Linux-PAM Manual         PAM_SM_AUTHENTICATE(3)
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NAME

6       pam_sm_authenticate - PAM service function for user authentication
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SYNOPSIS

9       #define PAM_SM_AUTH
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11       #include <security/pam_modules.h>
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13       int pam_sm_authenticate(pam_handle_t *pamh, int flags, int argc,
14                               const char **argv);
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DESCRIPTION

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

34       PAM_AUTH_ERR
35           Authentication failure.
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37       PAM_CRED_INSUFFICIENT
38           For some reason the application does not have sufficient
39           credentials to authenticate the user.
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41       PAM_AUTHINFO_UNAVAIL
42           The modules were not able to access the authentication information.
43           This might be due to a network or hardware failure etc.
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45       PAM_SUCCESS
46           The authentication token was successfully updated.
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48       PAM_USER_UNKNOWN
49           The supplied username is not known to the authentication service.
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51       PAM_MAXTRIES
52           One or more of the authentication modules has reached its limit of
53           tries authenticating the user. Do not try again.
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SEE ALSO

56       pam(3), pam_authenticate(3), pam_sm_setcred(3), pam_strerror(3), PAM(8)
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60Linux-PAM Manual                  05/18/2017            PAM_SM_AUTHENTICATE(3)
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