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s3:pam_smbpass: don't call openlog() or closelog() from pam_smbpass

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Patch from Steve Langasek with tiny fixes by me to make it apply to master.
Also see Debian bug #434372 and bugzilla #4831.

Calling openlog() or closelog() inside a pam module is not good as these
functions are not stackable and no program won't re-do openlog() just because a
pam module might have called closelog().
This commit is contained in:
Björn Jacke 2009-05-26 15:40:21 +02:00
parent 6b7bd37570
commit caeae66c5b
5 changed files with 105 additions and 81 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
source3/pam_smbpass/pam_smb_acct.c
View File

@ -58,26 +58,25 @@ int pam_sm_acct_mgmt( pam_handle_t *pamh, int flags,
/* Samba initialization. */
load_case_tables();
setup_logging( "pam_smbpass", False );
lp_set_in_client(True);
ctrl = set_ctrl( flags, argc, argv );
ctrl = set_ctrl(pamh, flags, argc, argv );
/* get the username */
retval = pam_get_user( pamh, &name, "Username: " );
if (retval != PAM_SUCCESS) {
if (on( SMB_DEBUG, ctrl )) {
_log_err( LOG_DEBUG, "acct: could not identify user" );
_log_err(pamh, LOG_DEBUG, "acct: could not identify user" );
}
return retval;
}
if (on( SMB_DEBUG, ctrl )) {
_log_err( LOG_DEBUG, "acct: username [%s] obtained", name );
_log_err(pamh, LOG_DEBUG, "acct: username [%s] obtained", name );
}
if (geteuid() != 0) {
_log_err( LOG_DEBUG, "Cannot access samba password database, not running as root.");
_log_err(pamh, LOG_DEBUG, "Cannot access samba password database, not running as root.");
return PAM_AUTHINFO_UNAVAIL;
}
@ -85,7 +84,7 @@ int pam_sm_acct_mgmt( pam_handle_t *pamh, int flags,
from a SIGPIPE it's not expecting */
oldsig_handler = CatchSignal(SIGPIPE, SIGNAL_CAST SIG_IGN);
if (!initialize_password_db(True, NULL)) {
_log_err( LOG_ALERT, "Cannot access samba password database" );
_log_err(pamh, LOG_ALERT, "Cannot access samba password database" );
CatchSignal(SIGPIPE, SIGNAL_CAST oldsig_handler);
return PAM_AUTHINFO_UNAVAIL;
}
@ -99,7 +98,7 @@ int pam_sm_acct_mgmt( pam_handle_t *pamh, int flags,
}
if (!pdb_getsampwnam(sampass, name )) {
_log_err( LOG_DEBUG, "acct: could not identify user" );
_log_err(pamh, LOG_DEBUG, "acct: could not identify user");
CatchSignal(SIGPIPE, SIGNAL_CAST oldsig_handler);
return PAM_USER_UNKNOWN;
}
@ -112,8 +111,8 @@ int pam_sm_acct_mgmt( pam_handle_t *pamh, int flags,
if (pdb_get_acct_ctrl(sampass) & ACB_DISABLED) {
if (on( SMB_DEBUG, ctrl )) {
_log_err( LOG_DEBUG
, "acct: account %s is administratively disabled", name );
_log_err(pamh, LOG_DEBUG,
"acct: account %s is administratively disabled", name);
}
make_remark( pamh, ctrl, PAM_ERROR_MSG
, "Your account has been disabled; "

19
source3/pam_smbpass/pam_smb_auth.c
View File

@ -81,10 +81,9 @@ int pam_sm_authenticate(pam_handle_t *pamh, int flags,
/* Samba initialization. */
load_case_tables();
setup_logging("pam_smbpass",False);
lp_set_in_client(True);
ctrl = set_ctrl(flags, argc, argv);
ctrl = set_ctrl(pamh, flags, argc, argv);
/* Get a few bytes so we can pass our return value to
pam_sm_setcred(). */
@ -99,29 +98,29 @@ int pam_sm_authenticate(pam_handle_t *pamh, int flags,
retval = pam_get_user( pamh, &name, "Username: " );
if ( retval != PAM_SUCCESS ) {
if (on( SMB_DEBUG, ctrl )) {
_log_err(LOG_DEBUG, "auth: could not identify user");
_log_err(pamh, LOG_DEBUG, "auth: could not identify user");
}
AUTH_RETURN;
}
if (on( SMB_DEBUG, ctrl )) {
_log_err( LOG_DEBUG, "username [%s] obtained", name );
_log_err(pamh, LOG_DEBUG, "username [%s] obtained", name );
}
if (geteuid() != 0) {
_log_err( LOG_DEBUG, "Cannot access samba password database, not running as root.");
_log_err(pamh, LOG_DEBUG, "Cannot access samba password database, not running as root.");
retval = PAM_AUTHINFO_UNAVAIL;
AUTH_RETURN;
}
if (!initialize_password_db(True, NULL)) {
_log_err( LOG_ALERT, "Cannot access samba password database" );
_log_err(pamh, LOG_ALERT, "Cannot access samba password database" );
retval = PAM_AUTHINFO_UNAVAIL;
AUTH_RETURN;
}
sampass = samu_new( NULL );
if (!sampass) {
_log_err( LOG_ALERT, "Cannot talloc a samu struct" );
_log_err(pamh, LOG_ALERT, "Cannot talloc a samu struct" );
retval = nt_status_to_pam(NT_STATUS_NO_MEMORY);
AUTH_RETURN;
}
@ -135,7 +134,7 @@ int pam_sm_authenticate(pam_handle_t *pamh, int flags,
}
if (!found) {
_log_err(LOG_ALERT, "Failed to find entry for user %s.", name);
_log_err(pamh, LOG_ALERT, "Failed to find entry for user %s.", name);
retval = PAM_USER_UNKNOWN;
TALLOC_FREE(sampass);
sampass = NULL;
@ -154,7 +153,7 @@ int pam_sm_authenticate(pam_handle_t *pamh, int flags,
retval = _smb_read_password(pamh, ctrl, NULL, "Password: ", NULL, _SMB_AUTHTOK, &p);
if (retval != PAM_SUCCESS ) {
_log_err(LOG_CRIT, "auth: no password provided for [%s]", name);
_log_err(pamh,LOG_CRIT, "auth: no password provided for [%s]", name);
TALLOC_FREE(sampass);
AUTH_RETURN;
}
@ -202,7 +201,7 @@ static int _smb_add_user(pam_handle_t *pamh, unsigned int ctrl,
retval = _pam_get_item( pamh, PAM_AUTHTOK, &pass );
if (retval != PAM_SUCCESS) {
_log_err( LOG_ALERT
_log_err(pamh, LOG_ALERT
, "pam_get_item returned error to pam_sm_authenticate" );
return PAM_AUTHTOK_RECOVER_ERR;
} else if (pass == NULL) {

40
source3/pam_smbpass/pam_smb_passwd.c
View File

@ -106,10 +106,9 @@ int pam_sm_chauthtok(pam_handle_t *pamh, int flags,
/* Samba initialization. */
load_case_tables();
setup_logging( "pam_smbpass", False );
lp_set_in_client(True);
ctrl = set_ctrl(flags, argc, argv);
ctrl = set_ctrl(pamh, flags, argc, argv);
/*
* First get the name of a user. No need to do anything if we can't
@ -119,16 +118,16 @@ int pam_sm_chauthtok(pam_handle_t *pamh, int flags,
retval = pam_get_user( pamh, &user, "Username: " );
if (retval != PAM_SUCCESS) {
if (on( SMB_DEBUG, ctrl )) {
_log_err( LOG_DEBUG, "password: could not identify user" );
_log_err(pamh, LOG_DEBUG, "password: could not identify user");
}
return retval;
}
if (on( SMB_DEBUG, ctrl )) {
_log_err( LOG_DEBUG, "username [%s] obtained", user );
_log_err(pamh, LOG_DEBUG, "username [%s] obtained", user);
}
if (geteuid() != 0) {
_log_err( LOG_DEBUG, "Cannot access samba password database, not running as root.");
_log_err(pamh, LOG_DEBUG, "Cannot access samba password database, not running as root.");
return PAM_AUTHINFO_UNAVAIL;
}
@ -137,7 +136,7 @@ int pam_sm_chauthtok(pam_handle_t *pamh, int flags,
oldsig_handler = CatchSignal(SIGPIPE, SIGNAL_CAST SIG_IGN);
if (!initialize_password_db(False, NULL)) {
_log_err( LOG_ALERT, "Cannot access samba password database" );
_log_err(pamh, LOG_ALERT, "Cannot access samba password database" );
CatchSignal(SIGPIPE, SIGNAL_CAST oldsig_handler);
return PAM_AUTHINFO_UNAVAIL;
}
@ -149,12 +148,12 @@ int pam_sm_chauthtok(pam_handle_t *pamh, int flags,
}
if (!pdb_getsampwnam(sampass,user)) {
_log_err( LOG_ALERT, "Failed to find entry for user %s.", user );
_log_err(pamh, LOG_ALERT, "Failed to find entry for user %s.", user);
CatchSignal(SIGPIPE, SIGNAL_CAST oldsig_handler);
return PAM_USER_UNKNOWN;
}
if (on( SMB_DEBUG, ctrl )) {
_log_err( LOG_DEBUG, "Located account for %s", user );
_log_err(pamh, LOG_DEBUG, "Located account for %s", user);
}
if (flags & PAM_PRELIM_CHECK) {
@ -180,7 +179,7 @@ int pam_sm_chauthtok(pam_handle_t *pamh, int flags,
#define greeting "Changing password for "
Announce = SMB_MALLOC_ARRAY(char, sizeof(greeting)+strlen(user));
if (Announce == NULL) {
_log_err(LOG_CRIT, "password: out of memory");
_log_err(pamh, LOG_CRIT, "password: out of memory");
TALLOC_FREE(sampass);
CatchSignal(SIGPIPE, SIGNAL_CAST oldsig_handler);
return PAM_BUF_ERR;
@ -195,8 +194,8 @@ int pam_sm_chauthtok(pam_handle_t *pamh, int flags,
SAFE_FREE( Announce );
if (retval != PAM_SUCCESS) {
_log_err( LOG_NOTICE
, "password - (old) token not obtained" );
_log_err(pamh, LOG_NOTICE,
"password - (old) token not obtained");
TALLOC_FREE(sampass);
CatchSignal(SIGPIPE, SIGNAL_CAST oldsig_handler);
return retval;
@ -241,7 +240,7 @@ int pam_sm_chauthtok(pam_handle_t *pamh, int flags,
}
if (retval != PAM_SUCCESS) {
_log_err( LOG_NOTICE, "password: user not authenticated" );
_log_err(pamh, LOG_NOTICE, "password: user not authenticated");
TALLOC_FREE(sampass);
CatchSignal(SIGPIPE, SIGNAL_CAST oldsig_handler);
return retval;
@ -266,8 +265,8 @@ int pam_sm_chauthtok(pam_handle_t *pamh, int flags,
if (retval != PAM_SUCCESS) {
if (on( SMB_DEBUG, ctrl )) {
_log_err( LOG_ALERT
, "password: new password not obtained" );
_log_err(pamh, LOG_ALERT,
"password: new password not obtained");
}
pass_old = NULL; /* tidy up */
TALLOC_FREE(sampass);
@ -288,7 +287,7 @@ int pam_sm_chauthtok(pam_handle_t *pamh, int flags,
retval = _pam_smb_approve_pass(pamh, ctrl, pass_old, pass_new);
if (retval != PAM_SUCCESS) {
_log_err(LOG_NOTICE, "new password not acceptable");
_log_err(pamh, LOG_NOTICE, "new password not acceptable");
pass_new = pass_old = NULL; /* tidy up */
TALLOC_FREE(sampass);
CatchSignal(SIGPIPE, SIGNAL_CAST oldsig_handler);
@ -308,16 +307,17 @@ int pam_sm_chauthtok(pam_handle_t *pamh, int flags,
/* password updated */
if (!sid_to_uid(pdb_get_user_sid(sampass), &uid)) {
_log_err( LOG_NOTICE, "Unable to get uid for user %s",
_log_err(pamh, LOG_NOTICE,
"Unable to get uid for user %s",
pdb_get_username(sampass));
_log_err( LOG_NOTICE, "password for (%s) changed by (%s/%d)",
_log_err(pamh, LOG_NOTICE, "password for (%s) changed by (%s/%d)",
user, uidtoname(getuid()), getuid());
} else {
_log_err( LOG_NOTICE, "password for (%s/%d) changed by (%s/%d)",
_log_err(pamh, LOG_NOTICE, "password for (%s/%d) changed by (%s/%d)",
user, uid, uidtoname(getuid()), getuid());
}
} else {
_log_err( LOG_ERR, "password change failed for user %s", user);
_log_err(pamh, LOG_ERR, "password change failed for user %s", user);
}
pass_old = pass_new = NULL;
@ -328,7 +328,7 @@ int pam_sm_chauthtok(pam_handle_t *pamh, int flags,
} else { /* something has broken with the library */
_log_err( LOG_ALERT, "password received unknown request" );
_log_err(pamh, LOG_ALERT, "password received unknown request");
retval = PAM_ABORT;
}

104
source3/pam_smbpass/support.c
View File

@ -14,6 +14,7 @@
* this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "includes.h"
#include "general.h"
@ -64,17 +65,42 @@ void _cleanup(pam_handle_t *, void *, int);
char *_pam_delete(register char *);
/* syslogging function for errors and other information */
void _log_err( int err, const char *format, ... )
#ifdef HAVE_PAM_VSYSLOG
void _log_err( pam_handle_t *pamh, int err, const char *format, ... )
{
va_list args;
va_list args;
va_start( args, format );
openlog( "PAM_smbpass", LOG_CONS | LOG_PID, LOG_AUTH );
vsyslog( err, format, args );
va_end( args );
closelog();
va_start(args, format);
pam_vsyslog(pamh, err, format, args);
va_end(args);
}
#else
void _log_err( pam_handle_t *pamh, int err, const char *format, ... )
{
va_list args;
const char tag[] = "(pam_smbpass) ";
char *mod_format;
mod_format = SMB_MALLOC_ARRAY(char, sizeof(tag) + strlen(format));
/* try really, really hard to log something, since this may have
been a message about a malloc() failure... */
if (mod_format == NULL) {
va_start(args, format);
vsyslog(err | LOG_AUTH, format, args);
va_end(args);
return;
}
strncpy(mod_format, tag, strlen(tag)+1);
strncat(mod_format, format, strlen(format));
va_start(args, format);
vsyslog(err | LOG_AUTH, mod_format, args);
va_end(args);
free(mod_format);
}
#endif
/* this is a front-end for module-application conversations */
@ -92,11 +118,11 @@ int converse( pam_handle_t * pamh, int ctrl, int nargs
,response, conv->appdata_ptr);
if (retval != PAM_SUCCESS && on(SMB_DEBUG, ctrl)) {
_log_err(LOG_DEBUG, "conversation failure [%s]"
_log_err(pamh, LOG_DEBUG, "conversation failure [%s]"
,pam_strerror(pamh, retval));
}
} else {
_log_err(LOG_ERR, "couldn't obtain coversation function [%s]"
_log_err(pamh, LOG_ERR, "couldn't obtain coversation function [%s]"
,pam_strerror(pamh, retval));
}
@ -123,7 +149,7 @@ int make_remark( pam_handle_t * pamh, unsigned int ctrl
/* set the control flags for the SMB module. */
int set_ctrl( int flags, int argc, const char **argv )
int set_ctrl( pam_handle_t *pamh, int flags, int argc, const char **argv )
{
int i = 0;
const char *service_file = NULL;
@ -165,7 +191,7 @@ int set_ctrl( int flags, int argc, const char **argv )
/* Read some options from the Samba config. Can be overridden by
the PAM config. */
if(lp_load(service_file,True,False,False,True) == False) {
_log_err( LOG_ERR, "Error loading service file %s", service_file );
_log_err(pamh, LOG_ERR, "Error loading service file %s", service_file);
}
secrets_init();
@ -188,7 +214,7 @@ int set_ctrl( int flags, int argc, const char **argv )
}
if (j >= SMB_CTRLS_) {
_log_err( LOG_ERR, "unrecognized option [%s]", *argv );
_log_err(pamh, LOG_ERR, "unrecognized option [%s]", *argv);
} else {
ctrl &= smb_args[j].mask; /* for turning things off */
ctrl |= smb_args[j].flag; /* for turning things on */
@ -227,7 +253,7 @@ void _cleanup( pam_handle_t * pamh, void *x, int error_status )
* evidence of old token around for later stack analysis.
*
*/
char * smbpXstrDup( const char *x )
char * smbpXstrDup( pam_handle_t *pamh, const char *x )
{
register char *newstr = NULL;
@ -237,7 +263,7 @@ char * smbpXstrDup( const char *x )
for (i = 0; x[i]; ++i); /* length of string */
if ((newstr = SMB_MALLOC_ARRAY(char, ++i)) == NULL) {
i = 0;
_log_err( LOG_CRIT, "out of memory in smbpXstrDup" );
_log_err(pamh, LOG_CRIT, "out of memory in smbpXstrDup");
} else {
while (i-- > 0) {
newstr[i] = x[i];
@ -279,7 +305,7 @@ void _cleanup_failures( pam_handle_t * pamh, void *fl, int err )
/* log the number of authentication failures */
if (failure->count != 0) {
_pam_get_item( pamh, PAM_SERVICE, &service );
_log_err( LOG_NOTICE
_log_err(pamh, LOG_NOTICE
, "%d authentication %s "
"from %s for service %s as %s(%d)"
, failure->count
@ -288,7 +314,7 @@ void _cleanup_failures( pam_handle_t * pamh, void *fl, int err )
, service == NULL ? "**unknown**" : service
, failure->user, failure->id );
if (failure->count > SMB_MAX_RETRIES) {
_log_err( LOG_ALERT
_log_err(pamh, LOG_ALERT
, "service(%s) ignoring max retries; %d > %d"
, service == NULL ? "**unknown**" : service
, failure->count
@ -324,8 +350,7 @@ int _smb_verify_password( pam_handle_t * pamh, struct samu *sampass,
if (!pdb_get_nt_passwd(sampass))
{
_log_err( LOG_DEBUG, "user %s has null SMB password"
, name );
_log_err(pamh, LOG_DEBUG, "user %s has null SMB password", name);
if (off( SMB__NONULL, ctrl )
&& (pdb_get_acct_ctrl(sampass) & ACB_PWNOTREQ))
@ -335,7 +360,7 @@ int _smb_verify_password( pam_handle_t * pamh, struct samu *sampass,
const char *service;
_pam_get_item( pamh, PAM_SERVICE, &service );
_log_err( LOG_NOTICE, "failed auth request by %s for service %s as %s",
_log_err(pamh, LOG_NOTICE, "failed auth request by %s for service %s as %s",
uidtoname(getuid()), service ? service : "**unknown**", name);
return PAM_AUTH_ERR;
}
@ -343,7 +368,7 @@ int _smb_verify_password( pam_handle_t * pamh, struct samu *sampass,
data_name = SMB_MALLOC_ARRAY(char, sizeof(FAIL_PREFIX) + strlen( name ));
if (data_name == NULL) {
_log_err( LOG_CRIT, "no memory for data-name" );
_log_err(pamh, LOG_CRIT, "no memory for data-name" );
return PAM_AUTH_ERR;
}
strncpy( data_name, FAIL_PREFIX, sizeof(FAIL_PREFIX) );
@ -390,31 +415,31 @@ int _smb_verify_password( pam_handle_t * pamh, struct samu *sampass,
retval = PAM_MAXTRIES;
}
} else {
_log_err(LOG_NOTICE,
_log_err(pamh, LOG_NOTICE,
"failed auth request by %s for service %s as %s",
uidtoname(getuid()),
service ? service : "**unknown**", name);
newauth->count = 1;
}
if (!sid_to_uid(pdb_get_user_sid(sampass), &(newauth->id))) {
_log_err(LOG_NOTICE,
_log_err(pamh, LOG_NOTICE,
"failed auth request by %s for service %s as %s",
uidtoname(getuid()),
service ? service : "**unknown**", name);
}
newauth->user = smbpXstrDup( name );
newauth->agent = smbpXstrDup( uidtoname( getuid() ) );
newauth->user = smbpXstrDup( pamh, name );
newauth->agent = smbpXstrDup( pamh, uidtoname( getuid() ) );
pam_set_data( pamh, data_name, newauth, _cleanup_failures );
} else {
_log_err( LOG_CRIT, "no memory for failure recorder" );
_log_err(LOG_NOTICE,
_log_err(pamh, LOG_CRIT, "no memory for failure recorder" );
_log_err(pamh, LOG_NOTICE,
"failed auth request by %s for service %s as %s(%d)",
uidtoname(getuid()),
service ? service : "**unknown**", name);
}
}
_log_err(LOG_NOTICE,
_log_err(pamh, LOG_NOTICE,
"failed auth request by %s for service %s as %s(%d)",
uidtoname(getuid()),
service ? service : "**unknown**", name);
@ -422,7 +447,7 @@ int _smb_verify_password( pam_handle_t * pamh, struct samu *sampass,
}
_pam_delete( data_name );
return retval;
}
@ -490,8 +515,8 @@ int _smb_read_password( pam_handle_t * pamh, unsigned int ctrl,
retval = _pam_get_item( pamh, authtok_flag, &item );
if (retval != PAM_SUCCESS) {
/* very strange. */
_log_err( LOG_ALERT
, "pam_get_item returned error to smb_read_password" );
_log_err(pamh, LOG_ALERT,
"pam_get_item returned error to smb_read_password");
return retval;
} else if (item != NULL) { /* we have a password! */
*pass = item;
@ -543,7 +568,7 @@ int _smb_read_password( pam_handle_t * pamh, unsigned int ctrl,
if (retval == PAM_SUCCESS) { /* a good conversation */
token = smbpXstrDup(resp[j++].resp);
token = smbpXstrDup(pamh, resp[j++].resp);
if (token != NULL) {
if (expect == 2) {
/* verify that password entered correctly */
@ -555,7 +580,8 @@ int _smb_read_password( pam_handle_t * pamh, unsigned int ctrl,
}
}
} else {
_log_err(LOG_NOTICE, "could not recover authentication token");
_log_err(pamh, LOG_NOTICE,
"could not recover authentication token");
}
}
@ -568,7 +594,7 @@ int _smb_read_password( pam_handle_t * pamh, unsigned int ctrl,
if (retval != PAM_SUCCESS) {
if (on( SMB_DEBUG, ctrl ))
_log_err( LOG_DEBUG, "unable to obtain a password" );
_log_err(pamh, LOG_DEBUG, "unable to obtain a password");
return retval;
}
/* 'token' is the entered password */
@ -583,7 +609,7 @@ int _smb_read_password( pam_handle_t * pamh, unsigned int ctrl,
|| (retval = _pam_get_item( pamh, authtok_flag
,&item )) != PAM_SUCCESS)
{
_log_err( LOG_CRIT, "error manipulating password" );
_log_err(pamh, LOG_CRIT, "error manipulating password");
return retval;
}
} else {
@ -597,8 +623,8 @@ int _smb_read_password( pam_handle_t * pamh, unsigned int ctrl,
|| (retval = _pam_get_data( pamh, data_name, &item ))
!= PAM_SUCCESS)
{
_log_err( LOG_CRIT, "error manipulating password data [%s]"
, pam_strerror( pamh, retval ));
_log_err(pamh, LOG_CRIT, "error manipulating password data [%s]",
pam_strerror( pamh, retval ));
_pam_delete( token );
item = NULL;
return retval;
@ -622,8 +648,8 @@ int _pam_smb_approve_pass(pam_handle_t * pamh,
if (pass_new == NULL || (pass_old && !strcmp( pass_old, pass_new )))
{
if (on(SMB_DEBUG, ctrl)) {
_log_err( LOG_DEBUG,
"passwd: bad authentication token (null or unchanged)" );
_log_err(pamh, LOG_DEBUG,
"passwd: bad authentication token (null or unchanged)");
}
make_remark( pamh, ctrl, PAM_ERROR_MSG, pass_new == NULL ?
"No password supplied" : "Password unchanged" );

6
source3/pam_smbpass/support.h
View File

@ -1,8 +1,8 @@
/* syslogging function for errors and other information */
extern void _log_err(int, const char *, ...);
extern void _log_err(pam_handle_t *, int, const char *, ...);
/* set the control flags for the UNIX module. */
extern int set_ctrl(int, int, const char **);
extern int set_ctrl(pam_handle_t *, int, int, const char **);
/* generic function for freeing pam data segments */
extern void _cleanup(pam_handle_t *, void *, int);
@ -12,7 +12,7 @@ extern void _cleanup(pam_handle_t *, void *, int);
* evidence of old token around for later stack analysis.
*/
extern char *smbpXstrDup(const char *);
extern char *smbpXstrDup(pam_handle_t *,const char *);
/* ************************************************************** *
* Useful non-trivial functions *