uams_dhx_pam.c File Reference

#include <arpa/inet.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <gcrypt.h>
#include <atalk/afp.h>
#include <atalk/logger.h>
#include <atalk/uam.h>

Macros
#define	KEYSIZE   16
#define	PASSWDLEN   64
#define	CRYPTBUFLEN   (KEYSIZE*2)
#define	CRYPT2BUFLEN   (KEYSIZE + PASSWDLEN)
#define	CHANGEPWBUFLEN   (KEYSIZE + 2*PASSWDLEN)
#define	dhxhash(a)
#define	COPY_STRING(s)
#define	PAM_CRED_ESTABLISH   PAM_ESTABLISH_CRED

Functions
static int	PAM_conv (int num_msg, struct pam_message **msg, struct pam_response **resp, void *appdata_ptr)
	PAM conversation function.
static int	dhx_setup (void *obj, const unsigned char *ibuf, size_t ibuflen, unsigned char *rbuf, size_t *rbuflen)
static int	login (void *obj, unsigned char *username, int ulen, struct passwd **uam_pwd, const unsigned char *ibuf, size_t ibuflen, unsigned char *rbuf, size_t *rbuflen)
static int	pam_login (void *obj, struct passwd **uam_pwd, unsigned char *ibuf, size_t ibuflen, unsigned char *rbuf, size_t *rbuflen)
	dhx login
static int	pam_login_ext (void *obj, char *uname, struct passwd **uam_pwd, const unsigned char *ibuf, size_t ibuflen, unsigned char *rbuf, size_t *rbuflen)
static int	pam_logincont (void *obj, struct passwd **uam_pwd, const unsigned char *ibuf, size_t ibuflen, unsigned char *rbuf, size_t *rbuflen)
static void	pam_logout (void)
static int	pam_changepw (void *obj, unsigned char *username, const struct passwd *pwd, unsigned char *ibuf, size_t ibuflen, unsigned char *rbuf, size_t *rbuflen)
	change pw for dhx
static int	uam_setup (void *obj, const char *path)
static void	uam_cleanup (void)

Variables
gcry_mpi_t	K
static struct passwd *	dhxpwd
static uint8_t	randbuf [KEYSIZE]
static unsigned char	msg2_iv [] = "CJalbert"
static unsigned char	msg3_iv [] = "LWallace"
static const unsigned char	p_binary []
static const unsigned char	g_binary [] = {0x07}
static pam_handle_t *	pamh = NULL
static unsigned char *	PAM_username
static unsigned char *	PAM_password
static struct pam_conv	PAM_conversation
UAM_MODULE_EXPORT struct uam_export	uams_dhx
UAM_MODULE_EXPORT struct uam_export	uams_dhx_pam

Macro Definition Documentation

CHANGEPWBUFLEN

#define CHANGEPWBUFLEN   (KEYSIZE + 2*PASSWDLEN)

COPY_STRING

#define COPY_STRING

(

s

)

Value:

(s) ? strdup(s) : NULL

CRYPT2BUFLEN

#define CRYPT2BUFLEN   (KEYSIZE + PASSWDLEN)

CRYPTBUFLEN

#define CRYPTBUFLEN   (KEYSIZE*2)

dhxhash

#define dhxhash

(

a

)

Value:

             ((((unsigned long) (a) >> 8) ^ \
             (unsigned long) (a)) & 0xffff)

hash a number to a 16-bit quantity

KEYSIZE

#define KEYSIZE   16

PAM_CRED_ESTABLISH

#define PAM_CRED_ESTABLISH   PAM_ESTABLISH_CRED

PASSWDLEN

#define PASSWDLEN   64

Function Documentation

dhx_setup()

int dhx_setup ( void * obj, const unsigned char * ibuf, size_t ibuflen, unsigned char * rbuf, size_t * rbuflen )

static

login()

int login ( void * obj, unsigned char * username, int ulen, struct passwd ** uam_pwd, const unsigned char * ibuf, size_t ibuflen, unsigned char * rbuf, size_t * rbuflen )

static

pam_changepw()

int pam_changepw ( void * obj, unsigned char * username, const struct passwd * pwd, unsigned char * ibuf, size_t ibuflen, unsigned char * rbuf, size_t * rbuflen )

static

change pw for dhx

Note

needs a couple passes to get everything all right. basically, it's like the login/logincont sequence

PAM_conv()

int PAM_conv ( int num_msg, struct pam_message ** msg, struct pam_response ** resp, void * appdata_ptr )

static

PAM conversation function.

Note

Here we assume (for now, at least) that echo on means login name, and echo off means password.

pam_login()

int pam_login ( void * obj, struct passwd ** uam_pwd, unsigned char * ibuf, size_t ibuflen, unsigned char * rbuf, size_t * rbuflen )

static

dhx login

Note

things are done in a slightly bizarre order to avoid having to clean things up if there's an error.

pam_login_ext()

int pam_login_ext ( void * obj, char * uname, struct passwd ** uam_pwd, const unsigned char * ibuf, size_t ibuflen, unsigned char * rbuf, size_t * rbuflen )

static

pam_logincont()

int pam_logincont ( void * obj, struct passwd ** uam_pwd, const unsigned char * ibuf, size_t ibuflen, unsigned char * rbuf, size_t * rbuflen )

static

pam_logout()

void pam_logout ( void )

static

uam_cleanup()

void uam_cleanup ( void )

static

uam_setup()

int uam_setup ( void * obj, const char * path )

static

Variable Documentation

dhxpwd

struct passwd* dhxpwd

static

g_binary

const unsigned char g_binary[] = {0x07}

static

K

gcry_mpi_t K

the secret key

msg2_iv

unsigned char msg2_iv[] = "CJalbert"

static

msg3_iv

unsigned char msg3_iv[] = "LWallace"

static

p_binary

const unsigned char p_binary[]

static

Initial value:

= {0xBA, 0x28, 0x73, 0xDF, 0xB0, 0x60, 0x57, 0xD4,
                                         0x3F, 0x20, 0x24, 0x74, 0x4C, 0xEE, 0xE7, 0x5B
                                        }

PAM_conversation

struct pam_conv PAM_conversation

static

Initial value:

= {
    &PAM_conv,
    NULL
}

PAM_password

unsigned char* PAM_password

static

PAM_username

unsigned char* PAM_username

static

pamh

pam_handle_t* pamh = NULL

static

randbuf

uint8_t randbuf[KEYSIZE]

static

uams_dhx

UAM_MODULE_EXPORT struct uam_export uams_dhx

Initial value:

= {
    UAM_MODULE_SERVER,
    UAM_MODULE_VERSION,
    uam_setup, uam_cleanup
}

uams_dhx_pam

UAM_MODULE_EXPORT struct uam_export uams_dhx_pam

Initial value:

= {
    UAM_MODULE_SERVER,
    UAM_MODULE_VERSION,
    uam_setup, uam_cleanup
}