uams_dhx2_pam.c File Reference

#include <errno.h>
#include <gcrypt.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <atalk/afp.h>
#include <atalk/constant_time.h>
#include <atalk/globals.h>
#include <atalk/logger.h>
#include <atalk/uam.h>

Macros
#define	PRIMEBITS   1024
#define	dhxhash(a)
#define	COPY_STRING(s)   (s) ? strdup(s) : NULL
#define	PAM_CRED_ESTABLISH   PAM_ESTABLISH_CRED

Functions
static int	dh_params_generate (unsigned int bits)
	Generate a new pair of prime and generator for use in the Diffie-Hellman key exchange.
static int	PAM_conv (int num_msg, struct pam_message **msg, struct pam_response **resp, void *appdata_ptr)
	PAM conversation function.
static int	dhx2_setup (void *obj, char *ibuf, size_t ibuflen, char *rbuf, size_t *rbuflen)
static int	login (void *obj, char *username, int ulen, struct passwd **uam_pwd, char *ibuf, size_t ibuflen, char *rbuf, size_t *rbuflen)
static int	pam_login (void *obj, struct passwd **uam_pwd, char *ibuf, size_t ibuflen, char *rbuf, size_t *rbuflen)
	dhx login
static int	pam_login_ext (void *obj, char *uname, struct passwd **uam_pwd, char *ibuf, size_t ibuflen, char *rbuf, size_t *rbuflen)
static int	logincont1 (void *obj, char *ibuf, size_t ibuflen, char *rbuf, size_t *rbuflen)
static int	logincont2 (void *obj_in, struct passwd **uam_pwd, char *ibuf, size_t ibuflen, char *rbuf, size_t *rbuflen)
static int	pam_logincont (void *obj, struct passwd **uam_pwd, char *ibuf, size_t ibuflen, char *rbuf, size_t *rbuflen)
static void	pam_logout (void)
static int	changepw_1 (void *obj, char *uname, char *ibuf, size_t ibuflen, char *rbuf, size_t *rbuflen)
static int	changepw_2 (void *obj, char *ibuf, size_t ibuflen, char *rbuf, size_t *rbuflen)
static int	changepw_3 (void *obj, char *ibuf, size_t ibuflen, char *rbuf, size_t *rbuflen)
static int	dhx2_changepw (void *obj, char *uname, struct passwd *pwd, char *ibuf, size_t ibuflen, char *rbuf, size_t *rbuflen)
static int	uam_setup (void *obj, const char *path)
static void	uam_cleanup (void)

Variables
static gcry_mpi_t	p
static gcry_mpi_t	g
static gcry_mpi_t	Ra
static gcry_mpi_t	serverNonce
static char *	K_MD5hash = NULL
static int	K_hash_len
static uint16_t	ID
static unsigned char	dhx_c2siv [] = { 'L', 'W', 'a', 'l', 'l', 'a', 'c', 'e' }
static unsigned char	dhx_s2civ [] = { 'C', 'J', 'a', 'l', 'b', 'e', 'r', 't' }
static pam_handle_t *	pamh = NULL
static char *	PAM_username
static char *	PAM_password
static struct passwd *	dhxpwd
static struct pam_conv	PAM_conversation
UAM_MODULE_EXPORT struct uam_export	uams_dhx2
UAM_MODULE_EXPORT struct uam_export	uams_dhx2_pam

Macro Definition Documentation

COPY_STRING

#define COPY_STRING

(

s

)

(s) ? strdup(s) : NULL

dhxhash

#define dhxhash

(

a

)

Value:

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

hash a number to a 16-bit quantity

PAM_CRED_ESTABLISH

#define PAM_CRED_ESTABLISH   PAM_ESTABLISH_CRED

PRIMEBITS

#define PRIMEBITS   1024

Number of bits for p which we generate. Everybody out there uses 512, so we beat them

Function Documentation

changepw_1()

static int changepw_1 ( void *  obj, char *  uname, char *  ibuf, size_t  ibuflen, char *  rbuf, size_t *  rbuflen  )

static

changepw_2()

static int changepw_2 ( void *  obj, char *  ibuf, size_t  ibuflen, char *  rbuf, size_t *  rbuflen  )

static

changepw_3()

static int changepw_3 ( void *  obj, char *  ibuf, size_t  ibuflen, char *  rbuf, size_t *  rbuflen  )

static

dh_params_generate()

static int dh_params_generate ( unsigned int  bits )

static

Generate a new pair of prime and generator for use in the Diffie-Hellman key exchange.

The bits value should be one of 768, 1024, 2048, 3072 or 4096.

dhx2_changepw()

static int dhx2_changepw ( void *  obj, char *  uname, struct passwd *  pwd, char *  ibuf, size_t  ibuflen, char *  rbuf, size_t *  rbuflen  )

static

dhx2_setup()

static int dhx2_setup ( void *  obj, char *  ibuf, size_t  ibuflen, char *  rbuf, size_t *  rbuflen  )

static

login()

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

static

logincont1()

static int logincont1 ( void *  obj, char *  ibuf, size_t  ibuflen, char *  rbuf, size_t *  rbuflen  )

static

logincont2()

static int logincont2 ( void *  obj_in, struct passwd **  uam_pwd, char *  ibuf, size_t  ibuflen, char *  rbuf, size_t *  rbuflen  )

static

PAM_conv()

static 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()

static int pam_login ( void *  obj, struct passwd **  uam_pwd, char *  ibuf, size_t  ibuflen, 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()

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

static

pam_logincont()

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

static

pam_logout()

static void pam_logout ( void  )

static

uam_cleanup()

static void uam_cleanup ( void  )

static

uam_setup()

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

static

Variable Documentation

dhx_c2siv

unsigned char dhx_c2siv[] = { 'L', 'W', 'a', 'l', 'l', 'a', 'c', 'e' }

static

dhx_s2civ

unsigned char dhx_s2civ[] = { 'C', 'J', 'a', 'l', 'b', 'e', 'r', 't' }

static

dhxpwd

struct passwd* dhxpwd

static

g

gcry_mpi_t g

static

ID

uint16_t ID

static

K_hash_len

int K_hash_len

static

K_MD5hash

char* K_MD5hash = NULL

static

p

gcry_mpi_t p

static

PAM_conversation

struct pam_conv PAM_conversation

static

Initial value:

= {
    &PAM_conv,
    NULL
}

PAM_password

char* PAM_password

static

PAM_username

char* PAM_username

static

pamh

pam_handle_t* pamh = NULL

static

Ra

gcry_mpi_t Ra

static

serverNonce

gcry_mpi_t serverNonce

static

uams_dhx2

UAM_MODULE_EXPORT struct uam_export uams_dhx2

Initial value:

= {
    UAM_MODULE_SERVER,
    UAM_MODULE_VERSION,
    uam_setup, uam_cleanup
}

uams_dhx2_pam

UAM_MODULE_EXPORT struct uam_export uams_dhx2_pam

Initial value:

= {
    UAM_MODULE_SERVER,
    UAM_MODULE_VERSION,
    uam_setup, uam_cleanup
}