This commit was manufactured by cvs2svn to create branch
'VENDOR-crypto-openssh'.
This commit is contained in:
cvs2svn
commit
e8edaf922f
334
crypto/openssh/auth2-pam.c
Normal file
334
crypto/openssh/auth2-pam.c
Normal file
@ -0,0 +1,334 @@
|
||||
/*-
|
||||
* Copyright (c) 2002 Networks Associates Technology, Inc.
|
||||
* All rights reserved.
|
||||
*
|
||||
* This software was developed for the FreeBSD Project by ThinkSec AS and
|
||||
* NAI Labs, the Security Research Division of Network Associates, Inc.
|
||||
* under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
|
||||
* DARPA CHATS research program.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
* 3. The name of the author may not be used to endorse or promote
|
||||
* products derived from this software without specific prior written
|
||||
* permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* $FreeBSD$
|
||||
*/
|
||||
|
||||
#ifdef USE_PAM
|
||||
#include "includes.h"
|
||||
RCSID("$FreeBSD$");
|
||||
|
||||
#include <security/pam_appl.h>
|
||||
|
||||
#include "auth.h"
|
||||
#include "xmalloc.h"
|
||||
|
||||
struct pam_ctxt {
|
||||
char *pam_user;
|
||||
pid_t pam_pid;
|
||||
int pam_sock;
|
||||
int pam_done;
|
||||
};
|
||||
|
||||
static void pam_free_ctx(void *);
|
||||
|
||||
/*
|
||||
* Send message to parent or child.
|
||||
*/
|
||||
static int
|
||||
pam_send(struct pam_ctxt *ctxt, char *fmt, ...)
|
||||
{
|
||||
va_list ap;
|
||||
char *mstr;
|
||||
size_t len;
|
||||
int r;
|
||||
|
||||
va_start(ap, fmt);
|
||||
len = vasprintf(&mstr, fmt, ap);
|
||||
va_end(ap);
|
||||
if (mstr == NULL)
|
||||
exit(1);
|
||||
if (ctxt->pam_pid != 0)
|
||||
debug2("to child: %s", mstr);
|
||||
r = send(ctxt->pam_sock, mstr, len + 1, MSG_EOR);
|
||||
free(mstr);
|
||||
return (r);
|
||||
}
|
||||
|
||||
/*
|
||||
* Peek at first byte of next message.
|
||||
*/
|
||||
static int
|
||||
pam_peek(struct pam_ctxt *ctxt)
|
||||
{
|
||||
char ch;
|
||||
|
||||
if (recv(ctxt->pam_sock, &ch, 1, MSG_PEEK) < 1)
|
||||
return (-1);
|
||||
return (ch);
|
||||
}
|
||||
|
||||
/*
|
||||
* Receive a message from parent or child.
|
||||
*/
|
||||
static char *
|
||||
pam_receive(struct pam_ctxt *ctxt)
|
||||
{
|
||||
char *buf;
|
||||
size_t len;
|
||||
ssize_t rlen;
|
||||
|
||||
len = 64;
|
||||
buf = NULL;
|
||||
do {
|
||||
len *= 2;
|
||||
buf = xrealloc(buf, len);
|
||||
rlen = recv(ctxt->pam_sock, buf, len, MSG_PEEK);
|
||||
if (rlen < 1) {
|
||||
xfree(buf);
|
||||
return (NULL);
|
||||
}
|
||||
} while (rlen == len);
|
||||
if (recv(ctxt->pam_sock, buf, len, 0) != rlen) {
|
||||
xfree(buf);
|
||||
return (NULL);
|
||||
}
|
||||
if (ctxt->pam_pid != 0)
|
||||
debug2("from child: %s", buf);
|
||||
return (buf);
|
||||
}
|
||||
|
||||
/*
|
||||
* Conversation function for child process.
|
||||
*/
|
||||
static int
|
||||
pam_child_conv(int n,
|
||||
const struct pam_message **msg,
|
||||
struct pam_response **resp,
|
||||
void *data)
|
||||
{
|
||||
struct pam_ctxt *ctxt;
|
||||
char *line;
|
||||
size_t len;
|
||||
int i;
|
||||
|
||||
ctxt = data;
|
||||
if (n <= 0 || n > PAM_MAX_NUM_MSG)
|
||||
return (PAM_CONV_ERR);
|
||||
if ((*resp = calloc(n, sizeof **resp)) == NULL)
|
||||
return (PAM_BUF_ERR);
|
||||
for (i = 0; i < n; ++i) {
|
||||
resp[i]->resp_retcode = 0;
|
||||
resp[i]->resp = NULL;
|
||||
switch (msg[i]->msg_style) {
|
||||
case PAM_PROMPT_ECHO_OFF:
|
||||
pam_send(ctxt, "p%s", msg[i]->msg);
|
||||
resp[i]->resp = pam_receive(ctxt);
|
||||
break;
|
||||
case PAM_PROMPT_ECHO_ON:
|
||||
pam_send(ctxt, "P%s", msg[i]->msg);
|
||||
resp[i]->resp = pam_receive(ctxt);
|
||||
break;
|
||||
case PAM_ERROR_MSG:
|
||||
/*pam_send(ctxt, "e%s", msg[i]->msg);*/
|
||||
break;
|
||||
case PAM_TEXT_INFO:
|
||||
/*pam_send(ctxt, "i%s", msg[i]->msg);*/
|
||||
break;
|
||||
default:
|
||||
goto fail;
|
||||
}
|
||||
}
|
||||
return (PAM_SUCCESS);
|
||||
fail:
|
||||
while (i)
|
||||
free(resp[--i]);
|
||||
free(*resp);
|
||||
*resp = NULL;
|
||||
return (PAM_CONV_ERR);
|
||||
}
|
||||
|
||||
/*
|
||||
* Child process.
|
||||
*/
|
||||
static void *
|
||||
pam_child(struct pam_ctxt *ctxt)
|
||||
{
|
||||
struct pam_conv pam_conv = { pam_child_conv, ctxt };
|
||||
pam_handle_t *pamh;
|
||||
char *msg;
|
||||
int pam_err;
|
||||
|
||||
pam_err = pam_start("sshd", ctxt->pam_user, &pam_conv, &pamh);
|
||||
if (pam_err != PAM_SUCCESS)
|
||||
goto auth_fail;
|
||||
pam_err = pam_authenticate(pamh, 0);
|
||||
if (pam_err != PAM_SUCCESS)
|
||||
goto auth_fail;
|
||||
pam_send(ctxt, "=OK");
|
||||
pam_end(pamh, pam_err);
|
||||
exit(0);
|
||||
auth_fail:
|
||||
pam_send(ctxt, "!%s", pam_strerror(pamh, pam_err));
|
||||
pam_end(pamh, pam_err);
|
||||
exit(0);
|
||||
}
|
||||
|
||||
static void *
|
||||
pam_init_ctx(Authctxt *authctxt)
|
||||
{
|
||||
struct pam_ctxt *ctxt;
|
||||
int socks[2];
|
||||
int i;
|
||||
|
||||
ctxt = xmalloc(sizeof *ctxt);
|
||||
ctxt->pam_user = xstrdup(authctxt->user);
|
||||
ctxt->pam_done = 0;
|
||||
if (socketpair(AF_UNIX, SOCK_DGRAM, PF_UNSPEC, socks) == -1) {
|
||||
error("%s: failed create sockets: %s",
|
||||
__func__, strerror(errno));
|
||||
xfree(ctxt);
|
||||
return (NULL);
|
||||
}
|
||||
if ((ctxt->pam_pid = fork()) == -1) {
|
||||
error("%s: failed to fork auth-pam child: %s",
|
||||
__func__, strerror(errno));
|
||||
close(socks[0]);
|
||||
close(socks[1]);
|
||||
xfree(ctxt);
|
||||
return (NULL);
|
||||
}
|
||||
if (ctxt->pam_pid == 0) {
|
||||
/* close everything except our end of the pipe */
|
||||
ctxt->pam_sock = socks[1];
|
||||
for (i = 0; i < getdtablesize(); ++i)
|
||||
if (i != ctxt->pam_sock)
|
||||
close(i);
|
||||
pam_child(ctxt);
|
||||
/* not reached */
|
||||
exit(1);
|
||||
}
|
||||
ctxt->pam_sock = socks[0];
|
||||
close(socks[1]);
|
||||
return (ctxt);
|
||||
}
|
||||
|
||||
static int
|
||||
pam_query(void *ctx, char **name, char **info,
|
||||
u_int *num, char ***prompts, u_int **echo_on)
|
||||
{
|
||||
struct pam_ctxt *ctxt = ctx;
|
||||
char *msg;
|
||||
|
||||
if ((msg = pam_receive(ctxt)) == NULL)
|
||||
return (-1);
|
||||
*name = xstrdup("");
|
||||
*info = xstrdup("");
|
||||
*prompts = xmalloc(sizeof(char *));
|
||||
*echo_on = xmalloc(sizeof(u_int));
|
||||
switch (*msg) {
|
||||
case 'P':
|
||||
**echo_on = 1;
|
||||
case 'p':
|
||||
*num = 1;
|
||||
**prompts = xstrdup(msg + 1);
|
||||
**echo_on = (*msg == 'P');
|
||||
break;
|
||||
case '=':
|
||||
*num = 0;
|
||||
**echo_on = 0;
|
||||
ctxt->pam_done = 1;
|
||||
break;
|
||||
case '!':
|
||||
error("%s", msg + 1);
|
||||
default:
|
||||
*num = 0;
|
||||
**echo_on = 0;
|
||||
xfree(msg);
|
||||
ctxt->pam_done = -1;
|
||||
return (-1);
|
||||
}
|
||||
xfree(msg);
|
||||
return (0);
|
||||
}
|
||||
|
||||
static int
|
||||
pam_respond(void *ctx, u_int num, char **resp)
|
||||
{
|
||||
struct pam_ctxt *ctxt = ctx;
|
||||
char *msg;
|
||||
|
||||
debug2(__func__);
|
||||
switch (ctxt->pam_done) {
|
||||
case 1:
|
||||
return (0);
|
||||
case 0:
|
||||
break;
|
||||
default:
|
||||
return (-1);
|
||||
}
|
||||
if (num != 1) {
|
||||
error("expected one response, got %u", num);
|
||||
return (-1);
|
||||
}
|
||||
pam_send(ctxt, "%s", *resp);
|
||||
switch (pam_peek(ctxt)) {
|
||||
case 'P':
|
||||
case 'p':
|
||||
return (1);
|
||||
case '=':
|
||||
msg = pam_receive(ctxt);
|
||||
xfree(msg);
|
||||
ctxt->pam_done = 1;
|
||||
return (0);
|
||||
default:
|
||||
msg = pam_receive(ctxt);
|
||||
if (*msg == '!')
|
||||
error("%s", msg + 1);
|
||||
xfree(msg);
|
||||
ctxt->pam_done = -1;
|
||||
return (-1);
|
||||
}
|
||||
}
|
||||
|
||||
static void
|
||||
pam_free_ctx(void *ctxtp)
|
||||
{
|
||||
struct pam_ctxt *ctxt = ctxtp;
|
||||
int i;
|
||||
|
||||
close(ctxt->pam_sock);
|
||||
kill(ctxt->pam_pid, SIGHUP);
|
||||
xfree(ctxt->pam_user);
|
||||
xfree(ctxt);
|
||||
}
|
||||
|
||||
KbdintDevice pam_device = {
|
||||
"pam",
|
||||
pam_init_ctx,
|
||||
pam_query,
|
||||
pam_respond,
|
||||
pam_free_ctx
|
||||
};
|
||||
|
||||
#endif /* USE_PAM */
|
||||
Loading…
Reference in New Issue
Block a user