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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 2002-2025 Free Software Foundation, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General
Public License along with this library. If not, see
<http://www.gnu.org/licenses/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <unistd.h>
#include <sys/types.h>
#include <pwd.h>
#ifdef HAVE_SHADOW_H
# include <shadow.h>
#endif
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#ifdef HAVE_SECURITY_PAM_APPL_H
# include <security/pam_appl.h>
#endif
#ifdef HAVE_CRYPT_H
# include <crypt.h>
#endif
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h> /*FIXME!*/
#include <mailutils/list.h>
#include <mailutils/iterator.h>
#include <mailutils/mailbox.h>
#include <mailutils/mu_auth.h>
#include <mailutils/nls.h>
#include <mailutils/errno.h>
#include <mailutils/util.h>
#include <mailutils/cli.h>
#ifdef ENABLE_VIRTUAL_DOMAINS
static char *pwddir = { SITE_VIRTUAL_PWDDIR };
static struct mu_cfg_param mu_virtdomain_param[] = {
{ "passwd-dir", mu_c_string, &pwddir, 0, NULL,
N_("Name of the directory where virtual domain password files are "
"located."),
N_("dir") },
{ NULL }
};
#if !HAVE_FGETPWENT
/* FIXME: A temporary solution. Need proper declaration in .h */
extern struct passwd *mu_fgetpwent (FILE *fp);
#define fgetpwent mu_fgetpwent
#endif
static struct passwd *
getpwnam_virtual (const char *u)
{
struct passwd *pw = NULL;
FILE *pfile;
size_t i = 0, len = strlen (u), delim = 0;
char *filename;
for (i = 0; i < len && delim == 0; i++)
if (u[i] == '!' || u[i] == ':' || u[i] == '@')
delim = i;
if (delim == 0)
return NULL;
filename = mu_make_file_name (pwddir, &u[delim + 1]);
if (filename == NULL)
return NULL;
pfile = fopen (filename, "r");
free (filename);
if (pfile)
{
while ((pw = fgetpwent (pfile)) != NULL)
{
if (strlen (pw->pw_name) == delim
&& strncmp (u, pw->pw_name, delim) == 0)
break;
}
fclose (pfile);
}
return pw;
}
static struct passwd *
getpwnam_ip_virtual (const char *u)
{
struct sockaddr_in addr;
struct passwd *pw = NULL;
socklen_t len = sizeof (addr);
if (getsockname (0, (struct sockaddr *)&addr, &len) == 0)
{
char *user;
char hostbuf[NI_MAXHOST];
if (getnameinfo((struct sockaddr *)&addr, len,
hostbuf, sizeof(hostbuf),
NULL, 0, 0) == 0)
{
user = malloc (strlen (hostbuf) + strlen (u) + 2);
if (user)
{
sprintf (user, "%s!%s", u, hostbuf);
pw = getpwnam_virtual (user);
free (user);
}
}
}
return pw;
}
/* Virtual domains */
static int
mu_auth_virt_domain_by_name (struct mu_auth_data **return_data,
const void *key,
void *unused_func_data, void *unused_call_data)
{
int rc;
struct passwd *pw;
char *mailbox_name;
if (!key)
return EINVAL;
pw = getpwnam_virtual (key);
if (!pw)
{
pw = getpwnam_ip_virtual (key);
if (!pw)
return MU_ERR_AUTH_FAILURE;
}
mailbox_name = mu_make_file_name (pw->pw_dir, "INBOX");
if (!mailbox_name)
return ENOMEM;
rc = mu_auth_data_alloc (return_data,
pw->pw_name,
pw->pw_passwd,
pw->pw_uid,
pw->pw_gid,
pw->pw_gecos,
pw->pw_dir,
pw->pw_shell,
mailbox_name,
0);
free (mailbox_name);
return rc;
}
#else
# define mu_virtdomain_param NULL
# define mu_auth_virt_domain_by_name NULL
#endif
struct mu_auth_module mu_auth_virtual_module = {
.name = "virtdomain",
.cfg = mu_virtdomain_param,
.handler = {
[mu_auth_getpwnam] = mu_auth_virt_domain_by_name,
}
};
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