source: vendor/3.5.10/source3/pam_smbpass/general.h

#ifndef LINUX
/* This is only needed by modules in the Sun implementation. */
#if defined(HAVE_SECURITY_PAM_APPL_H)
#include <security/pam_appl.h>
#elif defined(HAVE_PAM_PAM_APPL_H)
#include <pam/pam_appl.h>
#endif
#endif  /* LINUX */

#if defined(HAVE_SECURITY_PAM_MODULES_H)
#include <security/pam_modules.h>
#elif defined(HAVE_PAM_PAM_MODULES_H)
#include <pam/pam_modules.h>
#endif

#ifndef PAM_AUTHTOK_RECOVER_ERR  
#define PAM_AUTHTOK_RECOVER_ERR PAM_AUTHTOK_RECOVERY_ERR
#endif

#include <stdio.h>
#include <stdlib.h>
#include <syslog.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>

/*
 * here is the string to inform the user that the new passwords they
 * typed were not the same.
 */

#define MISTYPED_PASS "Sorry, passwords do not match"

/* type definition for the control options */

typedef struct {
     const char *token;
     unsigned int mask;            /* shall assume 32 bits of flags */
     unsigned int flag;
} SMB_Ctrls;

#ifndef False
#define False (0)
#endif

#ifndef True
#define True (1)
#endif

/* macro to determine if a given flag is on */
#define on(x,ctrl)  (smb_args[x].flag & ctrl)

/* macro to determine that a given flag is NOT on */
#define off(x,ctrl) (!on(x,ctrl))

/* macro to turn on/off a ctrl flag manually */
#define set(x,ctrl)   (ctrl = ((ctrl)&smb_args[x].mask)|smb_args[x].flag)
#define unset(x,ctrl) (ctrl &= ~(smb_args[x].flag))

/* the generic mask */
#define _ALL_ON_  (~0U)

/* end of macro definitions definitions for the control flags */

/*
 * These are the options supported by the smb password module, very
 * similar to the pwdb options
 */

#define SMB__OLD_PASSWD          0      /* internal */
#define SMB__VERIFY_PASSWD       1      /* internal */

#define SMB_AUDIT                2      /* print more things than debug..
                                           some information may be sensitive */
#define SMB_USE_FIRST_PASS       3
#define SMB_TRY_FIRST_PASS       4
#define SMB_NOT_SET_PASS         5      /* don't set the AUTHTOK items */

#define SMB__NONULL              6      /* internal */
#define SMB__QUIET               7      /* internal */
#define SMB_USE_AUTHTOK          8      /* insist on reading PAM_AUTHTOK */
#define SMB__NULLOK              9      /* Null token ok */
#define SMB_DEBUG               10      /* send more info to syslog(3) */
#define SMB_NODELAY             11      /* admin does not want a fail-delay */
#define SMB_MIGRATE             12      /* Does no authentication, just
                                           updates the smb database. */
#define SMB_CONF_FILE           13      /* Alternate location of smb.conf */

#define SMB_CTRLS_              14      /* number of ctrl arguments defined */

static const SMB_Ctrls smb_args[SMB_CTRLS_] = {
/* symbol                 token name          ctrl mask      ctrl       *
 * ------------------     ------------------  -------------- ---------- */

/* SMB__OLD_PASSWD */    {  NULL,            _ALL_ON_,              01 },
/* SMB__VERIFY_PASSWD */ {  NULL,            _ALL_ON_,              02 },
/* SMB_AUDIT */          { "audit",          _ALL_ON_,              04 },
/* SMB_USE_FIRST_PASS */ { "use_first_pass", _ALL_ON_^(030),       010 },
/* SMB_TRY_FIRST_PASS */ { "try_first_pass", _ALL_ON_^(030),       020 },
/* SMB_NOT_SET_PASS */   { "not_set_pass",   _ALL_ON_,             040 },
/* SMB__NONULL */        {  "nonull",        _ALL_ON_,            0100 },
/* SMB__QUIET */         {  NULL,            _ALL_ON_,            0200 },
/* SMB_USE_AUTHTOK */    { "use_authtok",    _ALL_ON_,            0400 },
/* SMB__NULLOK */        { "nullok",         _ALL_ON_^(0100),        0 },
/* SMB_DEBUG */          { "debug",          _ALL_ON_,           01000 },
/* SMB_NODELAY */        { "nodelay",        _ALL_ON_,           02000 },
/* SMB_MIGRATE */        { "migrate",        _ALL_ON_^(0100),    04000 },
/* SMB_CONF_FILE */      { "smbconf=",       _ALL_ON_,               0 },
};

#define SMB_DEFAULTS  (smb_args[SMB__NONULL].flag)

/*
 * the following is used to keep track of the number of times a user fails
 * to authenticate themself.
 */

#define FAIL_PREFIX                     "-SMB-FAIL-"
#define SMB_MAX_RETRIES                 3

struct _pam_failed_auth {
    char *user;                 /* user that's failed to be authenticated */
    uid_t id;                   /* uid of requested user */
    char *agent;                /* attempt from user with name */
    int count;                  /* number of failures so far */
};

/*
 * General use functions go here 
 */

/* from support.c */
int make_remark(pam_handle_t *, unsigned int, int, const char *);