login.c
4.16 KB
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/* GNU mailutils - a suite of utilities for electronic mail
Copyright (C) 1999, 2001 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "imap4d.h"
/*
* FIXME: this should support PAM, shadow, and normal password
*/
#ifdef USE_LIBPAM
#define COPY_STRING(s) (s) ? strdup(s) : NULL
static char *_pwd;
static char *_user;
static int _perr = 0;
#define PAM_ERROR if (_perr || (pamerror != PAM_SUCCESS)) { \
pam_end(pamh, 0); \
return util_finish (command, RESP_NO, "User name or passwd rejected"); }
static int
PAM_gnuimap4d_conv (int num_msg, const struct pam_message **msg,
struct pam_response **resp, void *appdata_ptr)
{
int replies = 0;
struct pam_response *reply = NULL;
reply = malloc (sizeof (*reply) * num_msg);
if (!reply)
return PAM_CONV_ERR;
for (replies = 0; replies < num_msg; replies++)
{
switch (msg[replies]->msg_style)
{
case PAM_PROMPT_ECHO_ON:
reply[replies].resp_retcode = PAM_SUCCESS;
reply[replies].resp = COPY_STRING (_user);
/* PAM frees resp */
break;
case PAM_PROMPT_ECHO_OFF:
reply[replies].resp_retcode = PAM_SUCCESS;
reply[replies].resp = COPY_STRING (_pwd);
/* PAM frees resp */
break;
case PAM_TEXT_INFO:
case PAM_ERROR_MSG:
reply[replies].resp_retcode = PAM_SUCCESS;
reply[replies].resp = NULL;
break;
default:
free (reply);
_perr = 1;
return PAM_CONV_ERR;
}
}
*resp = reply;
return PAM_SUCCESS;
}
static struct pam_conv PAM_conversation = { &PAM_gnuimap4d_conv, NULL };
#endif /* USE_LIBPAM */
int
imap4d_login (struct imap4d_command *command, char *arg)
{
struct passwd *pw;
char *sp = NULL, *username, *pass;
#ifdef USE_LIBPAM
pam_handle_t *pamh;
int pamerror;
#endif /* !USE_LIBPAM */
if (! (command->states & state))
return util_finish (command, RESP_BAD, "Wrong state");
username = util_getword (arg, &sp);
pass = util_getword (NULL, &sp);
/* Remove the double quotes. */
util_unquote (&username);
util_unquote (&pass);
if (username == NULL || *username == '\0' || pass == NULL)
return util_finish (command, RESP_NO, "Too few args");
else if (util_getword (NULL, &sp))
return util_finish (command, RESP_NO, "Too many args");
pw = getpwnam (username);
#ifndef USE_LIBPAM
if (pw == NULL || pw->pw_uid < 1)
return util_finish (command, RESP_NO, "User name or passwd rejected");
if (strcmp (pw->pw_passwd, (char *)crypt (pass, pw->pw_passwd)))
{
#ifdef HAVE_SHADOW_H
struct spwd *spw;
spw = getspnam (username);
if (spw == NULL || strcmp (spw->sp_pwdp, (char *)crypt (pass, spw->sp_pwdp)))
#endif /* HAVE_SHADOW_H */
return util_finish (command, RESP_NO, "User name or passwd rejected");
}
#else /* !USE_LIBPAM */
_user = (char *) username;
_pwd = pass;
/* libpam doesn't log to LOG_MAIL */
closelog ();
pamerror = pam_start ("gnu-imap4d", username, &PAM_conversation, &pamh);
PAM_ERROR;
pamerror = pam_authenticate (pamh, 0);
PAM_ERROR;
pamerror = pam_acct_mgmt (pamh, 0);
PAM_ERROR;
pamerror = pam_setcred (pamh, PAM_ESTABLISH_CRED);
PAM_ERROR;
pam_end (pamh, PAM_SUCCESS);
openlog ("gnu-imap4d", LOG_PID, LOG_MAIL);
#endif /* USE_LIBPAM */
if (pw->pw_uid > 1)
setuid (pw->pw_uid);
homedir = strdup (pw->pw_dir);
/* FIXME: Check for errors. */
chdir (homedir);
return util_finish (command, RESP_OK, "Completed");
}