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gnupg/dirmngr/dirmngr_ldap.c
Werner Koch b008274afd Nuked almost all trailing white space. 
We better do this once and for all instead of cluttering all future
commits with diffs of trailing white spaces.  In the majority of cases
blank or single lines are affected and thus this change won't disturb
a git blame too much.  For future commits the pre-commit scripts
checks that this won't happen again.
2011-02-04 12:57:53 +01:00

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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 <http://www.gnu.org/licenses/>.
*/
#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 <assert.h>
#include <sys/time.h>
#include <unistd.h>
#ifndef USE_LDAPWRAPPER
# include <pth.h>
#endif
#ifdef HAVE_W32_SYSTEM
#include <winsock2.h>
#include <winldap.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
#define JNLIB_NEED_LOG_LOGV
#include "../common/logging.h"
#include "../common/argparse.h"
#include "../common/stringhelp.h"
#include "../common/mischelp.h"
#include "../common/strlist.h"
#include "i18n.h"
#include "util.h"
/* With the ldap wrapper, there is no need for the pth_enter and leave
functions; thus we redefine them to nops. If we are not using the
ldap wrapper process we need to include the prototype for our
module's main function. */
#ifdef USE_LDAPWRAPPER
static void pth_enter (void) { }
static void pth_leave (void) { }
#else
# include "./ldap-wrapper.h"
#endif
#ifdef HAVE_W32CE_SYSTEM
# include "w32-ldap-help.h"
# define my_ldap_init(a,b) \
_dirmngr_ldap_init ((a), (b))
# define my_ldap_simple_bind_s(a,b,c) \
_dirmngr_ldap_simple_bind_s ((a),(b),(c))
# define my_ldap_search_st(a,b,c,d,e,f,g,h) \
_dirmngr_ldap_search_st ((a), (b), (c), (d), (e), (f), (g), (h))
# define my_ldap_first_attribute(a,b,c) \
_dirmngr_ldap_first_attribute ((a),(b),(c))
# define my_ldap_next_attribute(a,b,c) \
_dirmngr_ldap_next_attribute ((a),(b),(c))
# define my_ldap_get_values_len(a,b,c) \
_dirmngr_ldap_get_values_len ((a),(b),(c))
# define my_ldap_free_attr(a) \
xfree ((a))
#else
# define my_ldap_init(a,b) ldap_init ((a), (b))
# define my_ldap_simple_bind_s(a,b,c) ldap_simple_bind_s ((a), (b), (c))
# define my_ldap_search_st(a,b,c,d,e,f,g,h) \
ldap_search_st ((a), (b), (c), (d), (e), (f), (g), (h))
# define my_ldap_first_attribute(a,b,c) ldap_first_attribute ((a),(b),(c))
# define my_ldap_next_attribute(a,b,c) ldap_next_attribute ((a),(b),(c))
# define my_ldap_get_values_len(a,b,c) ldap_get_values_len ((a),(b),(c))
# define my_ldap_free_attr(a) ldap_memfree ((a))
#endif
#define DEFAULT_LDAP_TIMEOUT 100 /* Arbitrary long timeout. */
/* Constants for the options. */
enum
{
oQuiet = 'q',
oVerbose = 'v',
oTimeout = 500,
oMulti,
oProxy,
oHost,
oPort,
oUser,
oPass,
oEnvPass,
oDN,
oFilter,
oAttr,
oOnlySearchTimeout,
oLogWithPID
};
/* The list of options as used by the argparse.c code. */
static ARGPARSE_OPTS 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")},
{ 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, "@"},
{ 0, NULL, 0, NULL }
};
/* 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;
struct timeval timeout; /* Timeout for the LDAP search functions. */
unsigned int alarm_timeout; /* And for the alarm based timeout. */
int multi;
estream_t outstream; /* Send output to thsi 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. */
#ifdef USE_LDAPWRAPPER
static const char *
my_strusage (int level)
{
const char *p;
switch(level)
{
case 11: p = "dirmngr_ldap (GnuPG)";
break;
case 13: p = VERSION; 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;
}
#endif /*!USE_LDAPWRAPPER*/
int
#ifdef USE_LDAPWRAPPER
main (int argc, char **argv)
#else
ldap_wrapper_main (char **argv, estream_t outstream)
#endif
{
#ifndef USE_LDAPWRAPPER
int argc;
#endif
ARGPARSE_ARGS 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);
#ifdef USE_LDAPWRAPPER
set_strusage (my_strusage);
log_set_prefix ("dirmngr_ldap", JNLIB_LOG_WITH_PREFIX);
/* Setup I18N and common subsystems. */
i18n_init();
init_common_subsystems (&argc, &argv);
es_set_binary (es_stdout);
myopt->outstream = es_stdout;
#else /*!USE_LDAPWRAPPER*/
myopt->outstream = outstream;
for (argc=0; argv[argc]; argc++)
;
#endif /*!USE_LDAPWRAPPER*/
/* 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= 1; /* Do not remove the args. */
while (arg_parse (&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 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 | JNLIB_LOG_WITH_PID);
}
break;
default :
#ifdef USE_LDAPWRAPPER
pargs.err = ARGPARSE_PRINT_ERROR;
#else
pargs.err = ARGPARSE_PRINT_WARNING; /* No exit() please. */
#endif
break;
}
}
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);
#ifdef USE_LDAPWRAPPER
if (log_get_errorcount (0))
exit (2);
if (argc < 1)
usage (1);
#else
/* All passed arguments should be fine in this case. */
assert (argc);
#endif
#ifdef USE_LDAPWRAPPER
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
}
#endif /*USE_LDAPWRAPPER*/
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
static void
set_timeout (my_opt_t myopt)
{
#ifdef HAVE_W32_SYSTEM
/* FIXME for W32. */
(void)myopt;
#else
if (myopt->alarm_timeout)
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 (pth_enter (), item = ldap_first_entry (ld, msg), pth_leave ();
item;
pth_enter (), item = ldap_next_entry (ld, item), pth_leave ())
{
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 (pth_enter (), attr = my_ldap_first_attribute (ld, item, &berctx),
pth_leave ();
attr;
pth_enter (), attr = my_ldap_next_attribute (ld, item, berctx),
pth_leave ())
{
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)
{
my_ldap_free_attr (attr);
continue; /* Not found: Try next attribute. */
}
}
pth_enter ();
values = my_ldap_get_values_len (ld, item, attr);
pth_leave ();
if (!values)
{
if (myopt->verbose)
log_info (_("attribute `%s' not found\n"), attr);
my_ldap_free_attr (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);
my_ldap_free_attr (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);
my_ldap_free_attr (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);
my_ldap_free_attr (attr);
ber_free (berctx, 0);
return -1;
}
any = 1;
if (!myopt->multi)
break; /* Print only the first value. */
}
ldap_value_free_len (values);
my_ldap_free_attr (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;
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)
port = (ludp->lud_scheme && !strcmp (ludp->lud_scheme, "ldaps"))? 636:389;
if (myopt->verbose)
{
log_info (_("processing url `%s'\n"), url);
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);
pth_enter ();
ld = my_ldap_init (host, port);
pth_leave ();
if (!ld)
{
log_error (_("LDAP init to `%s:%d' failed: %s\n"),
host, port, strerror (errno));
return -1;
}
pth_enter ();
/* Fixme: Can we use MYOPT->user or is it shared with other theeads?. */
ret = my_ldap_simple_bind_s (ld, myopt->user, myopt->pass);
pth_leave ();
if (ret)
{
log_error (_("binding to `%s:%d' failed: %s\n"),
host, port, strerror (errno));
ldap_unbind (ld);
return -1;
}
set_timeout (myopt);
pth_enter ();
rc = my_ldap_search_st (ld, dn, ludp->lud_scope, filter,
myopt->multi && !myopt->attr && ludp->lud_attrs?
ludp->lud_attrs:attrs,
0,
&myopt->timeout, &msg);
pth_leave ();
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)
{
#ifdef HAVE_W32CE_SYSTEM
log_error ("searching `%s' failed: %d\n", url, rc);
#else
log_error (_("searching `%s' failed: %s\n"),
url, ldap_err2string (rc));
#endif
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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