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/* cvm-qmail.c - qmail lookup-only CVM
* Copyright (C) 2010 Bruce Guenter <bruce@untroubled.org>
*
* 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 of the License, 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <bglibs/sysdeps.h>
#include <ctype.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <bglibs/ibuf.h>
#include <bglibs/striter.h>
#include "module.h"
#include "qmail.h"
const char program[] = "cvm-qmail";
static struct qmail_user user;
static str domain;
static str username;
static str ext;
static str programs;
static int check_perms = 0;
static uid_t saved_uid;
static gid_t saved_gid;
int cvm_module_init(void)
{
const char* tmp;
if (qmail_lookup_init() == -1)
return CVME_IO;
if ((tmp = getenv("CVM_QMAIL_LOOKASIDE")) != 0) {
if (!str_copys(&programs, tmp))
return CVME_IO | CVME_FATAL;
str_subst(&programs, ' ', 0);
}
if ((tmp = getenv("CVM_QMAIL_CHECK_PERMS")) != 0 && tmp[0] != 0) {
check_perms = (tmp[0] == '-') ? CVME_PERMFAIL : CVME_IO;
saved_uid = getuid();
saved_gid = getgid();
}
return 0;
}
static int lookup_programs(const str* path)
{
static str dotqmail;
striter line;
striter progname;
const char* start;
const char* end;
unsigned long left;
if (!ibuf_openreadclose(path->s, &dotqmail))
return -1;
striter_loop(&line, &dotqmail, '\n') {
/* skip over spaces preceding '|' */
for (start = line.startptr, left = line.len;
left > 0 && isspace(*start);
--left, ++start)
;
if (left > 0 && *start == '|') {
/* skip spaces preceding the program name */
for (++start, --left;
left > 0 && isspace(*start);
--left, ++start)
;
/* the program name ends at the first space */
for (end = start;
left > 0 && !isspace(*end);
--left, ++end)
;
if (end > start) {
striter_loop(&progname, &programs, 0) {
if ((unsigned long)(end - start) == progname.len
&& memcmp(progname.startptr, start, progname.len) == 0)
return 1;
}
}
}
}
return 0;
}
/* Account name is either "baseuser-virtuser" or "virtuser@domain" */
int cvm_module_lookup(void)
{
static str path;
int r;
switch (qmail_lookup_cvm(&user, &domain, &username, &ext)) {
case -1:
return CVME_IO;
case 0:
break;
case 1:
cvm_module_fact_uint(CVM_FACT_OUTOFSCOPE, 1);
return CVME_PERMFAIL;
default:
cvm_module_fact_uint(CVM_FACT_OUTOFSCOPE, 0);
return CVME_PERMFAIL;
}
if (check_perms) {
setegid(user.gid);
seteuid(user.uid);
}
r = qmail_dotfile_exists(&user, ext.s, &path);
if (check_perms) {
seteuid(saved_uid);
setegid(saved_gid);
}
switch (r) {
case -1:
if (errno == EACCES && check_perms == CVME_PERMFAIL) {
cvm_module_fact_uint(CVM_FACT_OUTOFSCOPE, 0);
return CVME_PERMFAIL;
}
return CVME_IO;
case 0:
cvm_module_fact_uint(CVM_FACT_OUTOFSCOPE, 0);
return CVME_PERMFAIL;
}
if (programs.len > 0) {
switch (lookup_programs(&path)) {
case -1:
return CVME_IO;
case 0:
break;
default:
cvm_module_fact_uint(CVM_FACT_OUTOFSCOPE, 1);
return CVME_PERMFAIL;
}
}
return 0;
}
int cvm_module_authenticate(void)
{
return CVME_CONFIG;
}
int cvm_module_results(void)
{
cvm_fact_username = user.user.s;
cvm_fact_userid = user.uid;
cvm_fact_groupid = user.gid;
cvm_fact_realname = 0;
cvm_fact_directory = user.homedir.s;
cvm_fact_shell = 0;
cvm_fact_sys_username = user.user.s;
cvm_fact_sys_directory = user.homedir.s;
cvm_fact_domain = domain.s;
cvm_fact_mailbox = user.homedir.s;
return 0;
}
void cvm_module_stop(void)
{
}
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