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<DIV><SPAN class=625443921-03082007><FONT face=宋体>I'm studying on pam library ,
and I run the code given by "The Linux-PAM Application Developer's Guide" on
redhat linux.</FONT></SPAN></DIV>
<DIV><SPAN class=625443921-03082007><FONT face=宋体></FONT></SPAN> </DIV>
<DIV><SPAN class=625443921-03082007><FONT face=宋体>"retval =
pam_authenticate(pamh, 0);" is running successfully</FONT></SPAN></DIV>
<DIV><SPAN class=625443921-03082007><FONT face=宋体></FONT></SPAN> </DIV>
<DIV><SPAN class=625443921-03082007><FONT face=宋体>but the next "retval =
pam_acct_mgmt(pamh, 0);" return "PAM_AUTHINFO_UNAVAIL"</FONT></SPAN></DIV>
<DIV><SPAN class=625443921-03082007><FONT face=宋体></FONT></SPAN> </DIV>
<DIV><SPAN class=625443921-03082007><FONT face=宋体>I don't know what problem is
it? Please do me a favour.</FONT></SPAN></DIV>
<DIV><SPAN class=625443921-03082007><FONT face=宋体></FONT></SPAN> </DIV>
<DIV><SPAN class=625443921-03082007><FONT face=宋体>Thank you very
much</FONT></SPAN></DIV>
<DIV><SPAN class=625443921-03082007><FONT face=宋体></FONT></SPAN> </DIV>
<DIV><SPAN class=625443921-03082007><FONT face=宋体>Chu Qiu</FONT></SPAN></DIV>
<DIV><SPAN class=625443921-03082007><FONT face=宋体></FONT></SPAN> </DIV>
<DIV><SPAN class=625443921-03082007><FONT face=宋体>This is the code, and the
service file is the same as what mentioned in this code</FONT></SPAN></DIV>
<DIV><SPAN class=625443921-03082007><FONT face=宋体>/*<BR>This program was
contributed by Shane Watts<BR>[modifications by AGM and kukuk]<BR>You need to
add the following (or equivalent) to the<BR>/etc/pam.d/check_user file:<BR>#
check authorization<BR>auth required pam_unix.so<BR>account required
pam_unix.so<BR>*/<BR>#include <security/pam_appl.h><BR>#include
<security/pam_misc.h><BR>#include <stdio.h><BR>static struct
pam_conv conv = {<BR>misc_conv,<BR>NULL<BR>};<BR>int main(int argc, char
*argv[])<BR>{<BR>pam_handle_t *pamh=NULL;<BR>int retval;<BR>const char
*user="nobody";<BR>if(argc == 2) {<BR>user = argv[1];<BR>}<BR>if(argc > 2)
{<BR>fprintf(stderr, "Usage: check_user
[username]\n");<BR>exit(1);<BR>}<BR>retval = pam_start("check_user", user,
&conv, &pamh);<BR>if (retval == PAM_SUCCESS)<BR>retval =
pam_authenticate(pamh, 0); /* is user really user? */</FONT></SPAN></DIV>
<DIV> </DIV>
<DIV><SPAN class=625443921-03082007><FONT face=宋体>if (retval ==
PAM_SUCCESS)<BR>retval = pam_acct_mgmt(pamh, 0); /* permitted access?
*/<BR><BR>/* This is where we have been authorized or not. */<BR>if (retval ==
PAM_SUCCESS) {<BR>fprintf(stdout, "Authenticated\n");<BR>} else
{<BR>fprintf(stdout, "Not Authenticated\n");<BR>}<BR>if (pam_end(pamh,retval) !=
PAM_SUCCESS) { /* close Linux-PAM */<BR>pamh = NULL;<BR>fprintf(stderr,
"check_user: failed to release authenticator\n");<BR>exit(1);<BR>}<BR>return (
retval == PAM_SUCCESS ? 0:1 ); /* indicate success */<BR>}</FONT></SPAN></DIV>
<DIV> </DIV>
<DIV class=Section1>
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