int _pam_dispatch(pam_handle_t *pamh, int flags, int choice)
{
struct handler *h = NULL;
int retval = PAM_SYSTEM_ERR, use_cached_chain;
_pam_boolean resumed;
IF_NO_PAMH("_pam_dispatch", pamh, PAM_SYSTEM_ERR);
if (__PAM_FROM_MODULE(pamh)) {
D(("called from a module!?"));
goto end;
}
/* Load all modules, resolve all symbols */
if ((retval = _pam_init_handlers(pamh)) != PAM_SUCCESS) {
pam_syslog(pamh, LOG_ERR, "unable to dispatch function");
goto end;
}
use_cached_chain = _PAM_PLEASE_FREEZE;
switch (choice) {
case PAM_AUTHENTICATE:
h = pamh->handlers.conf.authenticate;
break;
case PAM_SETCRED:
h = pamh->handlers.conf.setcred;
use_cached_chain = _PAM_MAY_BE_FROZEN;
break;
case PAM_ACCOUNT:
h = pamh->handlers.conf.acct_mgmt;
break;
case PAM_OPEN_SESSION:
h = pamh->handlers.conf.open_session;
break;
case PAM_CLOSE_SESSION:
h = pamh->handlers.conf.close_session;
use_cached_chain = _PAM_MAY_BE_FROZEN;
break;
case PAM_CHAUTHTOK:
h = pamh->handlers.conf.chauthtok;
break;
default:
pam_syslog(pamh, LOG_ERR, "undefined fn choice; %d", choice);
retval = PAM_ABORT;
goto end;
}
if (h == NULL) { /* there was no handlers.conf... entry; will use
* handlers.other... */
switch (choice) {
case PAM_AUTHENTICATE:
h = pamh->handlers.other.authenticate;
break;
case PAM_SETCRED:
h = pamh->handlers.other.setcred;
break;
case PAM_ACCOUNT:
h = pamh->handlers.other.acct_mgmt;
break;
case PAM_OPEN_SESSION:
h = pamh->handlers.other.open_session;
break;
case PAM_CLOSE_SESSION:
h = pamh->handlers.other.close_session;
break;
case PAM_CHAUTHTOK:
h = pamh->handlers.other.chauthtok;
break;
}
}
/* Did a module return an "incomplete state" last time? */
if (pamh->former.choice != PAM_NOT_STACKED) {
if (pamh->former.choice != choice) {
pam_syslog(pamh, LOG_ERR,
"application failed to re-exec stack [%d:%d]",
pamh->former.choice, choice);
retval = PAM_ABORT;
goto end;
}
resumed = PAM_TRUE;
} else {
resumed = PAM_FALSE;
_pam_clear_grantors(h);
}
__PAM_TO_MODULE(pamh);
/* call the list of module functions */
pamh->choice = choice;
retval = _pam_dispatch_aux(pamh, flags, h, resumed, use_cached_chain);
resumed = PAM_FALSE;
__PAM_TO_APP(pamh);
/* Should we recall where to resume next time? */
if (retval == PAM_INCOMPLETE) {
D(("module [%d] returned PAM_INCOMPLETE"));
pamh->former.choice = choice;
} else {
pamh->former.choice = PAM_NOT_STACKED;
}
end:
#ifdef HAVE_LIBAUDIT
if (choice != PAM_CHAUTHTOK || flags & PAM_UPDATE_AUTHTOK || retval != PAM_SUCCESS) {
retval = _pam_auditlog(pamh, choice, retval, flags, h);
}
#endif
return retval;
}
int pam_start (
const char *service_name,
const char *user,
const struct pam_conv *pam_conversation,
pam_handle_t **pamh)
{
D(("called pam_start: [%s] [%s] [%p] [%p]"
,service_name, user, pam_conversation, pamh));
if (pamh == NULL) {
pam_syslog(NULL, LOG_CRIT,
"pam_start: invalid argument: pamh == NULL");
return (PAM_SYSTEM_ERR);
}
if (service_name == NULL) {
pam_syslog(NULL, LOG_CRIT,
"pam_start: invalid argument: service == NULL");
return (PAM_SYSTEM_ERR);
}
if (pam_conversation == NULL) {
pam_syslog(NULL, LOG_CRIT,
"pam_start: invalid argument: conv == NULL");
return (PAM_SYSTEM_ERR);
}
if ((*pamh = calloc(1, sizeof(**pamh))) == NULL) {
pam_syslog(NULL, LOG_CRIT, "pam_start: calloc failed for *pamh");
return (PAM_BUF_ERR);
}
/* All service names should be files below /etc/pam.d and nothing
else. Forbid paths. */
if (strrchr(service_name, '/') != NULL)
service_name = strrchr(service_name, '/') + 1;
/* Mark the caller as the application - permission to do certain
things is limited to a module or an application */
__PAM_TO_APP(*pamh);
if (((*pamh)->service_name = _pam_strdup(service_name)) == NULL) {
pam_syslog(*pamh, LOG_CRIT,
"pam_start: _pam_strdup failed for service name");
_pam_drop(*pamh);
return (PAM_BUF_ERR);
} else {
char *tmp;
for (tmp=(*pamh)->service_name; *tmp; ++tmp)
*tmp = tolower(*tmp); /* require lower case */
}
if (user) {
if (((*pamh)->user = _pam_strdup(user)) == NULL) {
pam_syslog(*pamh, LOG_CRIT,
"pam_start: _pam_strdup failed for user");
_pam_drop((*pamh)->service_name);
_pam_drop(*pamh);
return (PAM_BUF_ERR);
}
} else
(*pamh)->user = NULL;
(*pamh)->tty = NULL;
(*pamh)->prompt = NULL; /* prompt for pam_get_user() */
(*pamh)->ruser = NULL;
(*pamh)->rhost = NULL;
(*pamh)->authtok = NULL;
(*pamh)->oldauthtok = NULL;
(*pamh)->fail_delay.delay_fn_ptr = NULL;
(*pamh)->former.choice = PAM_NOT_STACKED;
(*pamh)->former.substates = NULL;
#ifdef HAVE_LIBAUDIT
(*pamh)->audit_state = 0;
#endif
(*pamh)->xdisplay = NULL;
(*pamh)->authtok_type = NULL;
memset (&((*pamh)->xauth), 0, sizeof ((*pamh)->xauth));
if (((*pamh)->pam_conversation = (struct pam_conv *)
malloc(sizeof(struct pam_conv))) == NULL) {
pam_syslog(*pamh, LOG_CRIT, "pam_start: malloc failed for pam_conv");
_pam_drop((*pamh)->service_name);
_pam_drop((*pamh)->user);
_pam_drop(*pamh);
return (PAM_BUF_ERR);
} else {
memcpy((*pamh)->pam_conversation, pam_conversation,
sizeof(struct pam_conv));
}
(*pamh)->data = NULL;
if ( _pam_make_env(*pamh) != PAM_SUCCESS ) {
pam_syslog(*pamh,LOG_ERR,"pam_start: failed to initialize environment");
_pam_drop((*pamh)->service_name);
_pam_drop((*pamh)->user);
_pam_drop(*pamh);
return PAM_ABORT;
}
_pam_reset_timer(*pamh); /* initialize timer support */
_pam_start_handlers(*pamh); /* cannot fail */
/* According to the SunOS man pages, loading modules and resolving
* symbols happens on the first call from the application. */
if ( _pam_init_handlers(*pamh) != PAM_SUCCESS ) {
pam_syslog(*pamh, LOG_ERR, "pam_start: failed to initialize handlers");
_pam_drop_env(*pamh); /* purge the environment */
_pam_drop((*pamh)->service_name);
_pam_drop((*pamh)->user);
_pam_drop(*pamh);
return PAM_ABORT;
}
D(("exiting pam_start successfully"));
return PAM_SUCCESS;
}