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/* pop3front-auth.c -- POP3 authentication front-end
* Copyright (C) 2008 Bruce Guenter <bruce@untroubled.org> or FutureQuest, Inc.
* Development of this program was sponsored by FutureQuest, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Contact information:
* FutureQuest Inc.
* PO BOX 623127
* Oviedo FL 32762-3127 USA
* http://www.FutureQuest.net/
* ossi@FutureQuest.net
*/
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <cvm/v2client.h>
#include <bglibs/iobuf.h>
#include <bglibs/striter.h>
#include <bglibs/str.h>
#include <cvm/sasl.h>
#include "pop3.h"
const char program[] = "pop3front-auth";
const int authenticating = 1;
static const char* cvm;
static char** nextcmd;
static const char* domain;
static str user;
static unsigned user_count;
static unsigned user_max;
static unsigned auth_count;
static unsigned auth_max;
static struct sasl_auth saslauth = { .prefix = "+ " };
static void do_exec(void)
{
if (!cvm_setugid() || !cvm_setenv())
respond(err_internal);
else {
alarm(0);
execvp(nextcmd[0], nextcmd);
respond("-ERR Could not execute second stage");
}
_exit(1);
}
static void cmd_auth_none(void)
{
static str auth_resp;
striter i;
switch (sasl_auth_caps(&auth_resp)) {
case 0:
respond(ok);
break;
case 1:
if (auth_resp.len <= 5) {
respond(err_internal);
return;
}
respond(ok);
str_lcut(&auth_resp, 5);
str_strip(&auth_resp);
striter_loop(&i, &auth_resp, ' ') {
obuf_write(&outbuf, i.startptr, i.len);
obuf_puts(&outbuf, CRLF);
}
break;
default:
respond(err_internal);
return;
}
respond(".");
}
static void cmd_auth(const str* s)
{
int i;
if ((i = sasl_auth1(&saslauth, s)) == 0)
do_exec();
obuf_write(&outbuf, "-ERR ", 5);
respond(sasl_auth_msg(&i));
++auth_count;
if (auth_max > 0 && auth_count >= auth_max)
exit(0);
}
static void cmd_user(const str* s)
{
++user_count;
if (user_max > 0 && user_count > user_max) {
respond("-ERR Too many USER commands issued");
exit(0);
}
if (!str_copy(&user, s))
respond(err_internal);
else
respond(ok);
}
static void cmd_pass(const str* s)
{
if (user.len == 0)
respond("-ERR Send USER first");
else {
int cr;
if ((cr = cvm_authenticate_password(cvm, user.s, domain, s->s, 1)) == 0)
do_exec();
str_truncate(&user, 0);
if (cr == CVME_PERMFAIL)
respond("-ERR Authentication failed");
else
respond(err_internal);
++auth_count;
if (auth_max > 0 && auth_count >= auth_max)
exit(0);
}
}
static void cmd_quit(void)
{
respond(ok);
exit(0);
}
command commands[] = {
{ "CAPA", cmd_capa, 0, 0 },
{ "AUTH", cmd_auth_none, cmd_auth, 0 },
{ "PASS", 0, cmd_pass, "PASS XXXXXXXX" },
{ "QUIT", cmd_quit, 0, 0 },
{ "USER", 0, cmd_user, 0 },
{ 0, 0, 0, 0 }
};
int startup(int argc, char* argv[])
{
static const char usage[] = "usage: pop3front-auth cvm program [args...]\n";
const char* tmp;
if ((tmp = getenv("MAXUSERCMD")) != 0)
user_max = strtoul(tmp, 0, 10);
if ((tmp = getenv("MAXAUTHFAIL")) != 0)
auth_max = strtoul(tmp, 0, 10);
if ((domain = cvm_ucspi_domain()) == 0)
domain = "unknown";
if (argc < 3) {
obuf_putsflush(&errbuf, usage);
return 0;
}
cvm = argv[1];
nextcmd = argv+2;
if (!sasl_auth_init(&saslauth)) {
respond("-ERR Could not initialize SASL AUTH");
return 0;
}
return 1;
}
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