This commit was manufactured by cvs2svn to create branch

'VENDOR-crypto-openssh'.
This commit is contained in:
cvs2svn 2002-03-21 12:18:28 +00:00
parent ae1f160d56
commit 556a3fb01e
Notes: svn2git 2020-12-20 02:59:44 +00:00
svn path=/vendor-crypto/openssh/dist/; revision=92877

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crypto/openssh/auth2-pam.c Normal file
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/*-
* 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 */