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/*
* pam_propperpwnam
*
* 2011-06-09
*
* Wolfgang Draxinger
* Wolfgang.Draxinger@physik.uni-muenchen.de
*
* a PAM module that sets the user loginname to the username
* stored in the user databased using the loginname passed
* as access key.
*
* Example usage scenario is adjusting the usernames' characters
* case in environments where case sensitive and case insensitive
* services are mixed (the module was initially developed for
* this very usage scenario).
*/
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include <pwd.h>
#if DEBUG
#include <stdio.h>
#endif
#define PAM_SM_AUTH
#include <security/pam_modules.h>
#include <security/_pam_macros.h>
PAM_EXTERN int
pam_sm_setcred(pam_handle_t *pamh, int flags, int argc, const char **argv)
{
return PAM_SUCCESS;
}
PAM_EXTERN int pam_sm_authenticate(
pam_handle_t *pamh,
int flags,
int argc,
char const *argv[] )
{
int error;
char *entered_username;
struct passwd pwd;
struct passwd *pwd_result;
char *pwd_buf;
size_t pwd_bufsize;
#if DEBUG
fprintf(stderr, "pam_propperpwnam called\n");
#endif
error = pam_get_user(pamh, (char const **)&entered_username, 0);
if(PAM_SUCCESS != error)
return PAM_USER_UNKNOWN;
#if DEBUG
fprintf(stderr, "pam_propperpwnam entered username is %s\n", entered_username);
#endif
pwd_bufsize = sysconf(_SC_GETPW_R_SIZE_MAX);
if( -1 == pwd_bufsize ) /* Value was indeterminate */
pwd_bufsize = 16384; /* Should be more than enough */
pwd_buf = malloc( pwd_bufsize );
if( !pwd_buf ) {
return PAM_AUTH_ERR;
}
error = getpwnam_r(entered_username, &pwd, pwd_buf, pwd_bufsize, &pwd_result);
if( !pwd_result ) {
free(pwd_buf);
if( !error )
return PAM_USER_UNKNOWN;
return PAM_AUTH_ERR;
}
#if DEBUG
fprintf(stderr, "pam_propperpwnam propper username is %s\n", pwd_result->pw_name);
#endif
error = pam_set_item(pamh, PAM_USER, pwd_result->pw_name);
free( pwd_buf );
if( PAM_SUCCESS != error ) {
return PAM_AUTH_ERR;
}
return PAM_SUCCESS;
}
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