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/* pam_naming module */
/*
* (c) 2005 Guido Guenther <agx@sigxcpu.org>
*
* TODO: threadsafety for pcre functions
*/
#define _BSD_SOURCE
#include <stdio.h>
#include <unistd.h>
#include <syslog.h>
#include <stdarg.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <pcre.h>
/*
* here, we make a definition for the externally accessible function
* in this file (this definition is required for static a module
* but strongly encouraged generally) it is used to instruct the
* modules include file to define the function prototypes.
*/
#define PAM_SM_AUTH
#include <security/pam_modules.h>
static void _pam_log(int err, const char *format, ...)
{
va_list args;
va_start(args, format);
openlog("PAM-naming", LOG_CONS|LOG_PID, LOG_AUTH);
vsyslog(err, format, args);
va_end(args);
closelog();
}
static int check_naming(pam_handle_t *pamh, int argc, const char* argv[])
{
pcre *re = NULL;
int ret=PAM_SUCCESS, i;
const char* user;
const char* regex=NULL;
const char *error = NULL;
int erroffset;
for (i = 0; i < argc; i++) {
if (!strncmp (argv[i], "regex=", 5))
regex = argv[i] + 6;
else
_pam_log(LOG_ERR, "illegal option %s", argv[i]);
ret=PAM_SYSTEM_ERR;
}
if(regex==NULL) {
_pam_log(LOG_ERR, "regex argument missing");
goto out;
}
if((ret=pam_get_item(pamh, PAM_USER, (const void **)&user)) != PAM_SUCCESS) {
_pam_log(LOG_ERR, "Couldnt retrieve username");
goto out;
}
re = pcre_compile(regex, 0, &error, &erroffset, NULL);
if(!re) {
_pam_log(LOG_ERR, "Error in regex \"%s\" at %d: %s", regex, erroffset, error);
ret=PAM_SYSTEM_ERR;
goto out;
}
if(pcre_exec(re, NULL , user, strlen(user), 0, 0, NULL, 0) == -1) {
_pam_log(LOG_INFO, "%s didn\'t match %s", user, regex);
ret=PAM_USER_UNKNOWN;
}
/* Success */
out:
if(re)
pcre_free(re);
return ret;
}
/* --- authentication management functions (only) --- */
PAM_EXTERN
int pam_sm_authenticate(pam_handle_t *pamh, int flags, int argc,
const char **argv)
{
return check_naming(pamh, argc, argv);
}
PAM_EXTERN
int pam_sm_setcred(pam_handle_t *pamh, int flags, int argc,
const char **argv)
{
return PAM_SUCCESS;
}
#ifdef PAM_STATIC
/* static module data */
struct pam_module _pam_warn_modstruct = {
"pam_exec",
pam_sm_authenticate,
pam_sm_setcred,
};
#endif
/* end of module definition */
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