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gnupg/dirmngr/dirmngr_ldap.c

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/* dirmngr-ldap.c - The LDAP helper for dirmngr.
* Copyright (C) 2004 g10 Code GmbH
* Copyright (C) 2010 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG 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 3 of the License, or
* (at your option) any later version.
*
* GnuPG 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, see <https://www.gnu.org/licenses/>.
* SPDX-License-Identifier: GPL-3.0-or-later
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <stdarg.h>
#include <string.h>
#ifdef HAVE_SIGNAL_H
# include <signal.h>
#endif
#include <errno.h>
#include <sys/time.h>
#include <unistd.h>
#ifdef HAVE_W32_SYSTEM
# include <winsock2.h>
# include <winldap.h>
# include <winber.h>
# include <fcntl.h>
# include "ldap-url.h"
#else
/* For OpenLDAP, to enable the API that we're using. */
# define LDAP_DEPRECATED 1
# include <ldap.h>
#endif
#include <gpg-error.h>
#include "../common/logging.h"
#include "../common/stringhelp.h"
#include "../common/mischelp.h"
#include "../common/strlist.h"
#include "../common/i18n.h"
#include "../common/util.h"
#include "../common/init.h"
/* There is no need for the npth_unprotect and leave functions here;
* thus we redefine them to nops. We keep them in the code just for
* the case we ever want to reuse parts of the code in npth programs. */
static void npth_unprotect (void) { }
static void npth_protect (void) { }
#ifdef HAVE_W32_SYSTEM
typedef LDAP_TIMEVAL my_ldap_timeval_t;
#else
typedef struct timeval my_ldap_timeval_t;
#endif
#define DEFAULT_LDAP_TIMEOUT 15 /* Arbitrary long timeout. */
/* Constants for the options. */
enum
{
oQuiet = 'q',
oVerbose = 'v',
oTimeout = 500,
oMulti,
oProxy,
oHost,
oPort,
oUser,
oPass,
oEnvPass,
oDN,
oFilter,
oAttr,
oTls,
oOnlySearchTimeout,
oLogWithPID
};
/* The list of options as used by the argparse.c code. */
static gpgrt_opt_t opts[] = {
{ oVerbose, "verbose", 0, N_("verbose") },
{ oQuiet, "quiet", 0, N_("be somewhat more quiet") },
{ oTimeout, "timeout", 1, N_("|N|set LDAP timeout to N seconds")},
{ oMulti, "multi", 0, N_("return all values in"
" a record oriented format")},
{ oProxy, "proxy", 2,
N_("|NAME|ignore host part and connect through NAME")},
{ oTls, "tls", 0, N_("force a TLS connection")},
{ oHost, "host", 2, N_("|NAME|connect to host NAME")},
{ oPort, "port", 1, N_("|N|connect to port N")},
{ oUser, "user", 2, N_("|NAME|use user NAME for authentication")},
{ oPass, "pass", 2, N_("|PASS|use password PASS"
" for authentication")},
{ oEnvPass, "env-pass", 0, N_("take password from $DIRMNGR_LDAP_PASS")},
{ oDN, "dn", 2, N_("|STRING|query DN STRING")},
{ oFilter, "filter", 2, N_("|STRING|use STRING as filter expression")},
{ oAttr, "attr", 2, N_("|STRING|return the attribute STRING")},
{ oOnlySearchTimeout, "only-search-timeout", 0, "@"},
{ oLogWithPID,"log-with-pid", 0, "@"},
ARGPARSE_end ()
};
/* A structure with module options. This is not a static variable
because if we are not build as a standalone binary, each thread
using this module needs to handle its own values. */
struct my_opt_s
{
int quiet;
int verbose;
my_ldap_timeval_t timeout;/* Timeout for the LDAP search functions. */
unsigned int alarm_timeout; /* And for the alarm based timeout. */
int multi;
int force_tls;
estream_t outstream; /* Send output to this stream. */
/* Note that we can't use const for the strings because ldap_* are
not defined that way. */
char *proxy; /* Host and Port override. */
char *user; /* Authentication user. */
char *pass; /* Authentication password. */
char *host; /* Override host. */
int port; /* Override port. */
char *dn; /* Override DN. */
char *filter;/* Override filter. */
char *attr; /* Override attribute. */
};
typedef struct my_opt_s *my_opt_t;
/* Prototypes. */
#ifndef HAVE_W32_SYSTEM
static void catch_alarm (int dummy);
#endif
static int process_url (my_opt_t myopt, const char *url);
/* Function called by argparse.c to display information. */
static const char *
my_strusage (int level)
{
const char *p;
switch (level)
{
case 9: p = "GPL-3.0-or-later"; break;
case 11: p = "dirmngr_ldap (@GNUPG@)";
break;
case 13: p = VERSION; break;
case 14: p = GNUPG_DEF_COPYRIGHT_LINE; break;
case 17: p = PRINTABLE_OS_NAME; break;
case 19: p = _("Please report bugs to <@EMAIL@>.\n"); break;
case 49: p = PACKAGE_BUGREPORT; break;
case 1:
case 40: p =
_("Usage: dirmngr_ldap [options] [URL] (-h for help)\n");
break;
case 41: p =
_("Syntax: dirmngr_ldap [options] [URL]\n"
"Internal LDAP helper for Dirmngr\n"
"Interface and options may change without notice\n");
break;
default: p = NULL;
}
return p;
}
int
main (int argc, char **argv)
{
gpgrt_argparse_t pargs;
int any_err = 0;
char *p;
int only_search_timeout = 0;
struct my_opt_s my_opt_buffer;
my_opt_t myopt = &my_opt_buffer;
char *malloced_buffer1 = NULL;
memset (&my_opt_buffer, 0, sizeof my_opt_buffer);
early_system_init ();
gpgrt_set_strusage (my_strusage);
log_set_prefix ("dirmngr_ldap", GPGRT_LOG_WITH_PREFIX);
/* Setup I18N and common subsystems. */
i18n_init();
init_common_subsystems (&argc, &argv);
es_set_binary (es_stdout);
myopt->outstream = es_stdout;
/* LDAP defaults */
myopt->timeout.tv_sec = DEFAULT_LDAP_TIMEOUT;
myopt->timeout.tv_usec = 0;
myopt->alarm_timeout = 0;
/* Parse the command line. */
pargs.argc = &argc;
pargs.argv = &argv;
pargs.flags= ARGPARSE_FLAG_KEEP;
while (gpgrt_argparse (NULL, &pargs, opts))
{
switch (pargs.r_opt)
{
case oVerbose: myopt->verbose++; break;
case oQuiet: myopt->quiet++; break;
case oTimeout:
myopt->timeout.tv_sec = pargs.r.ret_int;
myopt->timeout.tv_usec = 0;
myopt->alarm_timeout = pargs.r.ret_int;
break;
case oOnlySearchTimeout: only_search_timeout = 1; break;
case oMulti: myopt->multi = 1; break;
case oUser: myopt->user = pargs.r.ret_str; break;
case oPass: myopt->pass = pargs.r.ret_str; break;
case oEnvPass:
myopt->pass = getenv ("DIRMNGR_LDAP_PASS");
break;
case oProxy: myopt->proxy = pargs.r.ret_str; break;
case oTls: myopt->force_tls = 1; break;
case oHost: myopt->host = pargs.r.ret_str; break;
case oPort: myopt->port = pargs.r.ret_int; break;
case oDN: myopt->dn = pargs.r.ret_str; break;
case oFilter: myopt->filter = pargs.r.ret_str; break;
case oAttr: myopt->attr = pargs.r.ret_str; break;
case oLogWithPID:
{
unsigned int oldflags;
log_get_prefix (&oldflags);
log_set_prefix (NULL, oldflags | GPGRT_LOG_WITH_PID);
}
break;
default :
pargs.err = ARGPARSE_PRINT_ERROR;
break;
}
}
gpgrt_argparse (NULL, &pargs, NULL);
if (only_search_timeout)
myopt->alarm_timeout = 0;
if (myopt->proxy)
{
malloced_buffer1 = xtrystrdup (myopt->proxy);
if (!malloced_buffer1)
{
log_error ("error copying string: %s\n", strerror (errno));
return 1;
}
myopt->host = malloced_buffer1;
p = strchr (myopt->host, ':');
if (p)
{
*p++ = 0;
myopt->port = atoi (p);
}
if (!myopt->port)
myopt->port = 389; /* make sure ports gets overridden. */
}
if (myopt->port < 0 || myopt->port > 65535)
log_error (_("invalid port number %d\n"), myopt->port);
if (log_get_errorcount (0))
exit (2);
if (argc < 1)
gpgrt_usage (1);
if (myopt->alarm_timeout)
{
#ifndef HAVE_W32_SYSTEM
# if defined(HAVE_SIGACTION) && defined(HAVE_STRUCT_SIGACTION)
struct sigaction act;
act.sa_handler = catch_alarm;
sigemptyset (&act.sa_mask);
act.sa_flags = 0;
if (sigaction (SIGALRM,&act,NULL))
# else
if (signal (SIGALRM, catch_alarm) == SIG_ERR)
# endif
log_fatal ("unable to register timeout handler\n");
#endif
}
for (; argc; argc--, argv++)
if (process_url (myopt, *argv))
any_err = 1;
xfree (malloced_buffer1);
return any_err;
}
#ifndef HAVE_W32_SYSTEM
static void
catch_alarm (int dummy)
{
(void)dummy;
_exit (10);
}
#endif
#ifdef HAVE_W32_SYSTEM
static DWORD CALLBACK
alarm_thread (void *arg)
{
HANDLE timer = arg;
WaitForSingleObject (timer, INFINITE);
_exit (10);
return 0;
}
#endif
static void
set_timeout (my_opt_t myopt)
{
if (myopt->alarm_timeout)
{
#ifdef HAVE_W32_SYSTEM
static HANDLE timer;
LARGE_INTEGER due_time;
/* A negative value is a relative time. */
due_time.QuadPart = (unsigned long long)-10000000 * myopt->alarm_timeout;
if (!timer)
{
SECURITY_ATTRIBUTES sec_attr;
DWORD tid;
memset (&sec_attr, 0, sizeof sec_attr);
sec_attr.nLength = sizeof sec_attr;
sec_attr.bInheritHandle = FALSE;
/* Create a manual resettable timer. */
timer = CreateWaitableTimer (NULL, TRUE, NULL);
/* Initially set the timer. */
SetWaitableTimer (timer, &due_time, 0, NULL, NULL, 0);
if (CreateThread (&sec_attr, 0, alarm_thread, timer, 0, &tid))
log_error ("failed to create alarm thread\n");
}
else /* Retrigger the timer. */
SetWaitableTimer (timer, &due_time, 0, NULL, NULL, 0);
#else
alarm (myopt->alarm_timeout);
#endif
}
}
/* Helper for fetch_ldap(). */
static int
print_ldap_entries (my_opt_t myopt, LDAP *ld, LDAPMessage *msg, char *want_attr)
{
LDAPMessage *item;
int any = 0;
for (npth_unprotect (), item = ldap_first_entry (ld, msg), npth_protect ();
item;
npth_unprotect (), item = ldap_next_entry (ld, item), npth_protect ())
{
BerElement *berctx;
char *attr;
if (myopt->verbose > 1)
log_info (_("scanning result for attribute '%s'\n"),
want_attr? want_attr : "[all]");
if (myopt->multi)
{ /* Write item marker. */
if (es_fwrite ("I\0\0\0\0", 5, 1, myopt->outstream) != 1)
{
log_error (_("error writing to stdout: %s\n"),
strerror (errno));
return -1;
}
}
for (npth_unprotect (), attr = ldap_first_attribute (ld, item, &berctx),
npth_protect ();
attr;
npth_unprotect (), attr = ldap_next_attribute (ld, item, berctx),
npth_protect ())
{
struct berval **values;
int idx;
if (myopt->verbose > 1)
log_info (_(" available attribute '%s'\n"), attr);
set_timeout (myopt);
/* I case we want only one attribute we do a case
insensitive compare without the optional extension
(i.e. ";binary"). Case insensitive is not really correct
but the best we can do. */
if (want_attr)
{
char *cp1, *cp2;
int cmpres;
cp1 = strchr (want_attr, ';');
if (cp1)
*cp1 = 0;
cp2 = strchr (attr, ';');
if (cp2)
*cp2 = 0;
cmpres = ascii_strcasecmp (want_attr, attr);
if (cp1)
*cp1 = ';';
if (cp2)
*cp2 = ';';
if (cmpres)
{
ldap_memfree (attr);
continue; /* Not found: Try next attribute. */
}
}
npth_unprotect ();
values = ldap_get_values_len (ld, item, attr);
npth_protect ();
if (!values)
{
if (myopt->verbose)
log_info (_("attribute '%s' not found\n"), attr);
ldap_memfree (attr);
continue;
}
if (myopt->verbose)
{
log_info (_("found attribute '%s'\n"), attr);
if (myopt->verbose > 1)
for (idx=0; values[idx]; idx++)
log_info (" length[%d]=%d\n",
idx, (int)values[0]->bv_len);
}
if (myopt->multi)
{ /* Write attribute marker. */
unsigned char tmp[5];
size_t n = strlen (attr);
tmp[0] = 'A';
tmp[1] = (n >> 24);
tmp[2] = (n >> 16);
tmp[3] = (n >> 8);
tmp[4] = (n);
if (es_fwrite (tmp, 5, 1, myopt->outstream) != 1
|| es_fwrite (attr, n, 1, myopt->outstream) != 1)
{
log_error (_("error writing to stdout: %s\n"),
strerror (errno));
ldap_value_free_len (values);
ldap_memfree (attr);
ber_free (berctx, 0);
return -1;
}
}
for (idx=0; values[idx]; idx++)
{
if (myopt->multi)
{ /* Write value marker. */
unsigned char tmp[5];
size_t n = values[0]->bv_len;
tmp[0] = 'V';
tmp[1] = (n >> 24);
tmp[2] = (n >> 16);
tmp[3] = (n >> 8);
tmp[4] = (n);
if (es_fwrite (tmp, 5, 1, myopt->outstream) != 1)
{
log_error (_("error writing to stdout: %s\n"),
strerror (errno));
ldap_value_free_len (values);
ldap_memfree (attr);
ber_free (berctx, 0);
return -1;
}
}
if (es_fwrite (values[0]->bv_val, values[0]->bv_len,
1, myopt->outstream) != 1)
{
log_error (_("error writing to stdout: %s\n"),
strerror (errno));
ldap_value_free_len (values);
ldap_memfree (attr);
ber_free (berctx, 0);
return -1;
}
any = 1;
if (!myopt->multi)
break; /* Print only the first value. */
}
ldap_value_free_len (values);
ldap_memfree (attr);
if (want_attr || !myopt->multi)
break; /* We only want to return the first attribute. */
}
ber_free (berctx, 0);
}
if (myopt->verbose > 1 && any)
log_info ("result has been printed\n");
return any?0:-1;
}
/* Helper for the URL based LDAP query. */
static int
fetch_ldap (my_opt_t myopt, const char *url, const LDAPURLDesc *ludp)
{
LDAP *ld;
LDAPMessage *msg;
int rc = 0;
char *host, *dn, *filter, *attrs[2], *attr;
int port;
int ret;
int usetls;
host = myopt->host? myopt->host : ludp->lud_host;
port = myopt->port? myopt->port : ludp->lud_port;
dn = myopt->dn? myopt->dn : ludp->lud_dn;
filter = myopt->filter? myopt->filter : ludp->lud_filter;
attrs[0] = myopt->attr? myopt->attr : ludp->lud_attrs? ludp->lud_attrs[0]:NULL;
attrs[1] = NULL;
attr = attrs[0];
if (!port && myopt->force_tls)
port = 636;
else if (!port)
port = (ludp->lud_scheme && !strcmp (ludp->lud_scheme, "ldaps"))? 636:389;
if (myopt->verbose)
{
log_info (_("processing url '%s'\n"), url);
if (myopt->force_tls)
log_info ("forcing tls\n");
else
log_info ("not forcing tls\n");
if (myopt->user)
log_info (_(" user '%s'\n"), myopt->user);
if (myopt->pass)
log_info (_(" pass '%s'\n"), *myopt->pass?"*****":"");
if (host)
log_info (_(" host '%s'\n"), host);
log_info (_(" port %d\n"), port);
if (dn)
log_info (_(" DN '%s'\n"), dn);
if (filter)
log_info (_(" filter '%s'\n"), filter);
if (myopt->multi && !myopt->attr && ludp->lud_attrs)
{
int i;
for (i=0; ludp->lud_attrs[i]; i++)
log_info (_(" attr '%s'\n"), ludp->lud_attrs[i]);
}
else if (attr)
log_info (_(" attr '%s'\n"), attr);
}
if (!host || !*host)
{
log_error (_("no host name in '%s'\n"), url);
return -1;
}
if (!myopt->multi && !attr)
{
log_error (_("no attribute given for query '%s'\n"), url);
return -1;
}
if (!myopt->multi && !myopt->attr
&& ludp->lud_attrs && ludp->lud_attrs[0] && ludp->lud_attrs[1])
log_info (_("WARNING: using first attribute only\n"));
set_timeout (myopt);
usetls = (myopt->force_tls
|| (ludp->lud_scheme && !strcmp (ludp->lud_scheme, "ldaps")));
#if HAVE_W32_SYSTEM
if (1)
{
npth_unprotect ();
ld = ldap_sslinit (host, port, usetls);
npth_protect ();
if (!ld)
{
ret = LdapGetLastError ();
log_error (_("LDAP init to '%s:%d' failed: %s\n"),
host, port, ldap_err2string (ret));
return -1;
}
}
#else /*!W32*/
if (usetls)
{
char *uri;
uri = xtryasprintf ("ldaps://%s:%d", host, port);
if (!uri)
{
log_error (_("error allocating memory: %s\n"),
gpg_strerror (gpg_error_from_syserror ()));
return -1;
}
npth_unprotect ();
ret = ldap_initialize (&ld, uri);
npth_protect ();
if (ret)
{
log_error (_("LDAP init to '%s' failed: %s\n"),
uri, ldap_err2string (ret));
xfree (uri);
return -1;
}
else if (myopt->verbose)
log_info (_("LDAP init to '%s' done\n"), uri);
xfree (uri);
}
else
{
/* Keep the old way so to avoid regressions. Eventually we
* should really consider the supplied scheme and use only
* ldap_initialize. */
npth_unprotect ();
ld = ldap_init (host, port);
npth_protect ();
if (!ld)
{
log_error (_("LDAP init to '%s:%d' failed: %s\n"),
host, port, strerror (errno));
return -1;
}
}
#endif /*!W32*/
npth_unprotect ();
/* Fixme: Can we use MYOPT->user or is it shared with other theeads?. */
ret = ldap_simple_bind_s (ld, myopt->user, myopt->pass);
npth_protect ();
#ifdef LDAP_VERSION3
if (ret == LDAP_PROTOCOL_ERROR)
{
/* Protocol error could mean that the server only supports v3. */
int version = LDAP_VERSION3;
if (myopt->verbose)
log_info ("protocol error; retrying bind with v3 protocol\n");
npth_unprotect ();
ldap_set_option (ld, LDAP_OPT_PROTOCOL_VERSION, &version);
ret = ldap_simple_bind_s (ld, myopt->user, myopt->pass);
npth_protect ();
}
#endif
if (ret)
{
log_error (_("binding to '%s:%d' failed: %s\n"),
host, port, ldap_err2string (ret));
ldap_unbind (ld);
return -1;
}
set_timeout (myopt);
npth_unprotect ();
rc = ldap_search_st (ld, dn, ludp->lud_scope, filter,
myopt->multi && !myopt->attr && ludp->lud_attrs?
ludp->lud_attrs:attrs,
0,
&myopt->timeout, &msg);
npth_protect ();
if (rc == LDAP_SIZELIMIT_EXCEEDED && myopt->multi)
{
if (es_fwrite ("E\0\0\0\x09truncated", 14, 1, myopt->outstream) != 1)
{
log_error (_("error writing to stdout: %s\n"), strerror (errno));
return -1;
}
}
else if (rc)
{
log_error (_("searching '%s' failed: %s\n"),
url, ldap_err2string (rc));
if (rc != LDAP_NO_SUCH_OBJECT)
{
/* FIXME: Need deinit (ld)? */
/* Hmmm: Do we need to released MSG in case of an error? */
return -1;
}
}
rc = print_ldap_entries (myopt, ld, msg, myopt->multi? NULL:attr);
ldap_msgfree (msg);
ldap_unbind (ld);
return rc;
}
/* Main processing. Take the URL and run the LDAP query. The result
is printed to stdout, errors are logged to the log stream. */
static int
process_url (my_opt_t myopt, const char *url)
{
int rc;
LDAPURLDesc *ludp = NULL;
if (!ldap_is_ldap_url (url))
{
log_error (_("'%s' is not an LDAP URL\n"), url);
return -1;
}
if (ldap_url_parse (url, &ludp))
{
log_error (_("'%s' is an invalid LDAP URL\n"), url);
return -1;
}
rc = fetch_ldap (myopt, url, ludp);
ldap_free_urldesc (ludp);
return rc;
}
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