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/* pam_item.c */
/*
* $Id$
*/
#include "pam_private.h"
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#define TRY_SET(X, Y) \
{ \
if ((X) != (Y)) { \
char *_TMP_ = _pam_strdup(Y); \
if (_TMP_ == NULL && (Y) != NULL) \
return PAM_BUF_ERR; \
free(X); \
(X) = _TMP_; \
} \
}
/* functions */
int pam_set_item (pam_handle_t *pamh, int item_type, const void *item)
{
int retval;
D(("called"));
IF_NO_PAMH("pam_set_item", pamh, PAM_SYSTEM_ERR);
retval = PAM_SUCCESS;
switch (item_type) {
case PAM_SERVICE:
/* Setting handlers_loaded to 0 will cause the handlers
* to be reloaded on the next call to a service module.
*/
pamh->handlers.handlers_loaded = 0;
TRY_SET(pamh->service_name, item);
{
char *tmp;
for (tmp=pamh->service_name; *tmp; ++tmp)
*tmp = tolower(*tmp); /* require lower case */
}
break;
case PAM_USER:
TRY_SET(pamh->user, item);
pamh->former.fail_user = PAM_SUCCESS;
break;
case PAM_USER_PROMPT:
TRY_SET(pamh->prompt, item);
pamh->former.fail_user = PAM_SUCCESS;
break;
case PAM_TTY:
D(("setting tty to %s", item));
TRY_SET(pamh->tty, item);
break;
case PAM_RUSER:
TRY_SET(pamh->ruser, item);
break;
case PAM_RHOST:
TRY_SET(pamh->rhost, item);
break;
case PAM_AUTHTOK:
/*
* PAM_AUTHTOK and PAM_OLDAUTHTOK are only accessible from
* modules.
*/
if (__PAM_FROM_MODULE(pamh)) {
if (pamh->authtok != item) {
_pam_overwrite(pamh->authtok);
TRY_SET(pamh->authtok, item);
}
} else {
retval = PAM_BAD_ITEM;
}
break;
case PAM_OLDAUTHTOK:
/*
* PAM_AUTHTOK and PAM_OLDAUTHTOK are only accessible from
* modules.
*/
if (__PAM_FROM_MODULE(pamh)) {
if (pamh->oldauthtok != item) {
_pam_overwrite(pamh->oldauthtok);
TRY_SET(pamh->oldauthtok, item);
}
} else {
retval = PAM_BAD_ITEM;
}
break;
case PAM_CONV: /* want to change the conversation function */
if (item == NULL) {
pam_syslog(pamh, LOG_ERR,
"pam_set_item: attempt to set conv() to NULL");
retval = PAM_PERM_DENIED;
} else {
struct pam_conv *tconv;
if ((tconv=
(struct pam_conv *) malloc(sizeof(struct pam_conv))
) == NULL) {
pam_syslog(pamh, LOG_CRIT,
"pam_set_item: malloc failed for pam_conv");
retval = PAM_BUF_ERR;
} else {
memcpy(tconv, item, sizeof(struct pam_conv));
_pam_drop(pamh->pam_conversation);
pamh->pam_conversation = tconv;
pamh->former.fail_user = PAM_SUCCESS;
}
}
break;
case PAM_FAIL_DELAY:
pamh->fail_delay.delay_fn_ptr = item;
break;
case PAM_XDISPLAY:
TRY_SET(pamh->xdisplay, item);
break;
case PAM_XAUTHDATA:
if (&pamh->xauth == item)
break;
if (pamh->xauth.namelen) {
_pam_overwrite(pamh->xauth.name);
free(pamh->xauth.name);
}
if (pamh->xauth.datalen) {
_pam_overwrite_n(pamh->xauth.data,
(unsigned int) pamh->xauth.datalen);
free(pamh->xauth.data);
}
pamh->xauth = *((const struct pam_xauth_data *) item);
if ((pamh->xauth.name=_pam_strdup(pamh->xauth.name)) == NULL) {
memset(&pamh->xauth, '\0', sizeof(pamh->xauth));
return PAM_BUF_ERR;
}
if ((pamh->xauth.data=_pam_memdup(pamh->xauth.data,
pamh->xauth.datalen)) == NULL) {
_pam_overwrite(pamh->xauth.name);
free(pamh->xauth.name);
memset(&pamh->xauth, '\0', sizeof(pamh->xauth));
return PAM_BUF_ERR;
}
break;
case PAM_AUTHTOK_TYPE:
TRY_SET(pamh->authtok_type, item);
break;
default:
retval = PAM_BAD_ITEM;
}
return retval;
}
int pam_get_item (const pam_handle_t *pamh, int item_type, const void **item)
{
int retval = PAM_SUCCESS;
D(("called."));
IF_NO_PAMH("pam_get_item", pamh, PAM_SYSTEM_ERR);
if (item == NULL) {
pam_syslog(pamh, LOG_ERR,
"pam_get_item: nowhere to place requested item");
return PAM_PERM_DENIED;
}
else
*item = NULL;
switch (item_type) {
case PAM_SERVICE:
*item = pamh->service_name;
break;
case PAM_USER:
D(("returning user=%s", pamh->user));
*item = pamh->user;
break;
case PAM_USER_PROMPT:
D(("returning userprompt=%s", pamh->user));
*item = pamh->prompt;
break;
case PAM_TTY:
D(("returning tty=%s", pamh->tty));
*item = pamh->tty;
break;
case PAM_RUSER:
*item = pamh->ruser;
break;
case PAM_RHOST:
*item = pamh->rhost;
break;
case PAM_AUTHTOK:
/*
* PAM_AUTHTOK and PAM_OLDAUTHTOK are only accessible from
* modules.
*/
if (__PAM_FROM_MODULE(pamh)) {
*item = pamh->authtok;
} else {
retval = PAM_BAD_ITEM;
}
break;
case PAM_OLDAUTHTOK:
/*
* PAM_AUTHTOK and PAM_OLDAUTHTOK are only accessible from
* modules.
*/
if (__PAM_FROM_MODULE(pamh)) {
*item = pamh->oldauthtok;
} else {
retval = PAM_BAD_ITEM;
}
break;
case PAM_CONV:
*item = pamh->pam_conversation;
break;
case PAM_FAIL_DELAY:
*item = pamh->fail_delay.delay_fn_ptr;
break;
case PAM_XDISPLAY:
*item = pamh->xdisplay;
break;
case PAM_XAUTHDATA:
*item = &pamh->xauth;
break;
case PAM_AUTHTOK_TYPE:
*item = pamh->authtok_type;
break;
default:
retval = PAM_BAD_ITEM;
}
return retval;
}
/*
* This function is the 'preferred method to obtain the username'.
*/
int pam_get_user(pam_handle_t *pamh, const char **user, const char *prompt)
{
const char *use_prompt;
int retval;
struct pam_message msg;
const struct pam_message *pmsg;
struct pam_response *resp;
D(("called."));
IF_NO_PAMH("pam_get_user", pamh, PAM_SYSTEM_ERR);
if (user == NULL) {
/* ensure that the module has supplied a destination */
pam_syslog(pamh, LOG_ERR, "pam_get_user: nowhere to record username");
return PAM_PERM_DENIED;
} else
*user = NULL;
if (pamh->pam_conversation == NULL) {
pam_syslog(pamh, LOG_ERR, "pam_get_user: no conv element in pamh");
return PAM_SERVICE_ERR;
}
if (pamh->user) { /* have one so return it */
*user = pamh->user;
return PAM_SUCCESS;
}
if (pamh->former.fail_user != PAM_SUCCESS)
return pamh->former.fail_user;
/* will need a prompt */
if (prompt != NULL)
use_prompt = prompt;
else if (pamh->prompt != NULL)
use_prompt = pamh->prompt;
else
use_prompt = _("login:");
/* If we are resuming an old conversation, we verify that the prompt
is the same. Anything else is an error. */
if (pamh->former.want_user) {
/* must have a prompt to resume with */
if (! pamh->former.prompt) {
pam_syslog(pamh, LOG_ERR,
"pam_get_user: failed to resume with prompt"
);
return PAM_ABORT;
}
/* must be the same prompt as last time */
if (strcmp(pamh->former.prompt, use_prompt)) {
pam_syslog(pamh, LOG_ERR,
"pam_get_user: resumed with different prompt");
return PAM_ABORT;
}
/* ok, we can resume where we left off last time */
pamh->former.want_user = PAM_FALSE;
_pam_overwrite(pamh->former.prompt);
_pam_drop(pamh->former.prompt);
}
/* converse with application -- prompt user for a username */
pmsg = &msg;
msg.msg_style = PAM_PROMPT_ECHO_ON;
msg.msg = use_prompt;
resp = NULL;
retval = pamh->pam_conversation->
conv(1, &pmsg, &resp, pamh->pam_conversation->appdata_ptr);
if (retval == PAM_CONV_AGAIN) {
/* conversation function is waiting for an event - save state */
D(("conversation function is not ready yet"));
pamh->former.want_user = PAM_TRUE;
pamh->former.prompt = _pam_strdup(use_prompt);
} else if (resp == NULL || resp->resp == NULL) {
/*
* conversation should have given a response
*/
D(("pam_get_user: no response provided"));
retval = PAM_CONV_ERR;
pamh->former.fail_user = retval;
} else if (retval == PAM_SUCCESS) { /* copy the username */
/*
* now we set the PAM_USER item -- this was missing from pre.53
* releases. However, reading the Sun manual, it is part of
* the standard API.
*/
retval = pam_set_item(pamh, PAM_USER, resp->resp);
*user = pamh->user;
} else
pamh->former.fail_user = retval;
if (resp) {
if (retval != PAM_SUCCESS)
pam_syslog(pamh, LOG_WARNING,
"unexpected response from failed conversation function");
/*
* note 'resp' is allocated by the application and is
* correctly free()'d here
*/
_pam_drop_reply(resp, 1);
}
D(("completed"));
return retval; /* pass on any error from conversation */
}
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