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![Werner Koch](/assets/img/avatar_default.png)
* dirmngr/ldap-misc.c: New.
* dirmngr/ldap-misc.h: New.
* dirmngr/ks-engine-ldap.c: Include ldap-misc.h.
(ldap_err_to_gpg_err, ldap_to_gpg_err): Move to ldap-misc.c.
* dirmngr/ldap-wrapper.c (ldap_wrapper): Print list of args in debug
mode.
* dirmngr/server.c (lookup_cert_by_pattern): Handle GPG_ERR_NOT_FOUND
the saqme as GPG_ERR_NO_DATA.
* dirmngr/ldap.c (run_ldap_wrapper): Add args tls_mode and ntds.
Remove arg url. Adjust for changes in dirmngr_ldap.
(url_fetch_ldap): Remove args host and port. Parse the URL and use
these values to call run_ldap_wrapper.
(attr_fetch_ldap): Pass tls flags to run_ldap_wrapper.
(rfc2254_need_escape, rfc2254_escape): New.
(extfilt_need_escape, extfilt_escape): New.
(parse_one_pattern): Rename to ...
(make_one_filter): this. Change for new dirmngr_ldap calling
convention. Make issuer DN searching partly work.
(escape4url, make_url): Remove.
(start_cert_fetch_ldap): Change for new dirmngr_ldap calling
convention.
* dirmngr/dirmngr_ldap.c: Major rewrite.
* dirmngr/t-ldap-misc.c: New.
* dirmngr/t-support.h (DIM, DIMof): New.
* dirmngr/Makefile.am (dirmngr_ldap_SOURCES): Add ldap-misc.c
(module_tests) [USE_LDAP]: Add t-ldap-misc.
(t_ldap_parse_uri_SOURCES): Ditto.
(t_ldap_misc_SOURCES): New.
--
This rewrite allows to properly handle TLS and avoids some code
duplication.
Signed-off-by: Werner Koch <wk@gnupg.org>
(cherry picked from commit 39815c023f
)
1004 lines
27 KiB
C
1004 lines
27 KiB
C
/* ldap.c - LDAP access
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* Copyright (C) 2002 Klarälvdalens Datakonsult AB
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* Copyright (C) 2003, 2004, 2005, 2007, 2008, 2010, 2021 g10 Code GmbH
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* DirMngr is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <https://www.gnu.org/licenses/>.
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* SPDX-License-Identifier: GPL-3.0-or-later
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <time.h>
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#include <npth.h>
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#include "dirmngr.h"
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#include "../common/exechelp.h"
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#include "crlfetch.h"
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#include "ldapserver.h"
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#include "misc.h"
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#include "ldap-wrapper.h"
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#include "ldap-url.h"
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#include "../common/host2net.h"
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#define UNENCODED_URL_CHARS "abcdefghijklmnopqrstuvwxyz" \
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ" \
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"01234567890" \
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"$-_.+!*'(),"
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#define USERCERTIFICATE "userCertificate"
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#define CACERTIFICATE "caCertificate"
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#define X509CACERT "x509caCert"
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#define USERSMIMECERTIFICATE "userSMIMECertificate"
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/* Definition for the context of the cert fetch functions. */
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struct cert_fetch_context_s
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{
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ksba_reader_t reader; /* The reader used (shallow copy). */
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unsigned char *tmpbuf; /* Helper buffer. */
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size_t tmpbufsize; /* Allocated size of tmpbuf. */
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int truncated; /* Flag to indicate a truncated output. */
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};
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/* Add HOST and PORT to our list of LDAP servers. Fixme: We should
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better use an extra list of servers. */
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static void
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add_server_to_servers (const char *host, int port)
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{
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ldap_server_t server;
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ldap_server_t last = NULL;
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const char *s;
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if (!port)
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port = 389;
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for (server=opt.ldapservers; server; server = server->next)
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{
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if (!strcmp (server->host, host) && server->port == port)
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return; /* already in list... */
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last = server;
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}
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/* We assume that the host names are all supplied by our
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configuration files and thus are sane. To keep this assumption
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we must reject all invalid host names. */
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for (s=host; *s; s++)
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if (!strchr ("abcdefghijklmnopqrstuvwxyz"
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"01234567890.-", *s))
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{
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log_error (_("invalid char 0x%02x in host name - not added\n"), *s);
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return;
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}
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log_info (_("adding '%s:%d' to the ldap server list\n"), host, port);
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server = xtrycalloc (1, sizeof *s);
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if (!server)
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log_error (_("malloc failed: %s\n"), strerror (errno));
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else
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{
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server->host = xstrdup (host);
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server->port = port;
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if (last)
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last->next = server;
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else
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opt.ldapservers = server;
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}
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}
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/* Perform an LDAP query. Returns an gpg error code or 0 on success.
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The function returns a new reader object at READER. */
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static gpg_error_t
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run_ldap_wrapper (ctrl_t ctrl,
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int ignore_timeout,
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int multi_mode,
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int tls_mode,
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int ntds,
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const char *proxy,
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const char *host, int port,
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const char *user, const char *pass,
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const char *base, const char *filter, const char *attr,
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ksba_reader_t *reader)
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{
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const char *argv[50];
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int argc;
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char portbuf[30], timeoutbuf[30];
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*reader = NULL;
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argc = 0;
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if (pass && *pass) /* Note, that the password must be the first item. */
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{
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argv[argc++] = "--pass";
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argv[argc++] = pass;
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}
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if (DBG_LOOKUP)
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argv[argc++] = "-vv";
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else if (DBG_EXTPROG)
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argv[argc++] = "-v";
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argv[argc++] = "--log-with-pid";
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if (multi_mode)
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argv[argc++] = "--multi";
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if (tls_mode == 1)
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argv[argc++] = "--starttls";
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else if (tls_mode)
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argv[argc++] = "--ldaptls";
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if (ntds)
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argv[argc++] = "--ntds";
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if (opt.ldaptimeout)
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{
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snprintf (timeoutbuf, sizeof timeoutbuf, "%u", opt.ldaptimeout);
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argv[argc++] = "--timeout";
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argv[argc++] = timeoutbuf;
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if (ignore_timeout)
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argv[argc++] = "--only-search-timeout";
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}
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if (proxy)
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{
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argv[argc++] = "--proxy";
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argv[argc++] = proxy;
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}
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if (host && *host)
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{
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argv[argc++] = "--host";
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argv[argc++] = host;
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}
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if (port)
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{
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sprintf (portbuf, "%d", port);
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argv[argc++] = "--port";
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argv[argc++] = portbuf;
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}
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if (user && *user)
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{
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argv[argc++] = "--user";
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argv[argc++] = user;
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}
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if (base && *base)
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{
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argv[argc++] = "--base";
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argv[argc++] = base;
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}
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if (attr)
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{
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argv[argc++] = "--attr";
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argv[argc++] = attr;
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}
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if (filter)
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argv[argc++] = filter;
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argv[argc] = NULL;
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return ldap_wrapper (ctrl, reader, argv);
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}
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/* Perform a LDAP query using a given URL. On success a new ksba
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reader is returned. If HOST or PORT are not 0, they are used to
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override the values from the URL. */
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gpg_error_t
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url_fetch_ldap (ctrl_t ctrl, const char *url, ksba_reader_t *reader)
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{
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gpg_error_t err;
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LDAPURLDesc *ludp = NULL;
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int tls_mode;
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if (!ldap_is_ldap_url (url))
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{
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log_error (_("'%s' is not an LDAP URL\n"), url);
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return gpg_error (GPG_ERR_INV_URI);
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}
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if (ldap_url_parse (url, &ludp))
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{
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log_error (_("'%s' is an invalid LDAP URL\n"), url);
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return gpg_error (GPG_ERR_INV_URI);
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}
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if (ludp->lud_filter && ludp->lud_filter[0] != '(')
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{
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log_error (_("'%s' is an invalid LDAP URL\n"), url);
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err = gpg_error (GPG_ERR_BAD_URI);
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goto leave;
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}
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if (ludp->lud_scheme && !strcmp (ludp->lud_scheme, "ldaps"))
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tls_mode = 2; /* LDAP-over-TLS here becuase we get it from certs. */
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else
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tls_mode = 0;
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err = run_ldap_wrapper (ctrl,
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1, /* Ignore explicit timeout because CRLs
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might be very large. */
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0, /* No Multi-mode. */
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tls_mode,
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0, /* No AD authentication. */
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opt.ldap_proxy,
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ludp->lud_host, ludp->lud_port,
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NULL, NULL, /* user, password */
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ludp->lud_dn, /* Base DN */
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ludp->lud_filter,
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ludp->lud_attrs? ludp->lud_attrs[0] : NULL,
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reader);
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/* FIXME: This option might be used for DoS attacks. Because it
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will enlarge the list of servers to consult without a limit and
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all LDAP queries w/o a host are will then try each host in
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turn. */
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if (!err && opt.add_new_ldapservers && !opt.ldap_proxy)
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{
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if (ludp->lud_host)
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add_server_to_servers (ludp->lud_host, ludp->lud_port);
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}
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/* If the lookup failed and we are not only using the proxy, we try
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again using our default list of servers. */
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if (err && !(opt.ldap_proxy && opt.only_ldap_proxy))
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{
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struct ldapserver_iter iter;
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if (DBG_LOOKUP)
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log_debug ("no hostname in URL or query failed; "
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"trying all default hostnames\n");
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for (ldapserver_iter_begin (&iter, ctrl);
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err && ! ldapserver_iter_end_p (&iter);
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ldapserver_iter_next (&iter))
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{
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ldap_server_t server = iter.server;
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if (server->starttls)
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tls_mode = 1;
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else if (server->ldap_over_tls)
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tls_mode = 2;
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else
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tls_mode = 0;
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err = run_ldap_wrapper (ctrl,
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0,
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0, /* No Multi-mode */
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tls_mode,
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server->ntds,
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NULL,
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server->host, server->port,
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server->user, server->pass,
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server->base,
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ludp->lud_filter,
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ludp->lud_attrs? ludp->lud_attrs[0] : NULL,
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reader);
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if (!err)
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break;
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}
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}
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leave:
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ldap_free_urldesc (ludp);
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return err;
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}
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/* Perform an LDAP query on all configured servers. On error the
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error code of the last try is returned. */
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gpg_error_t
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attr_fetch_ldap (ctrl_t ctrl,
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const char *dn, const char *attr, ksba_reader_t *reader)
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{
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gpg_error_t err = gpg_error (GPG_ERR_CONFIGURATION);
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struct ldapserver_iter iter;
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*reader = NULL;
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/* FIXME; we might want to look at the Base DN to try matching
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servers first. */
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for (ldapserver_iter_begin (&iter, ctrl); ! ldapserver_iter_end_p (&iter);
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ldapserver_iter_next (&iter))
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{
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ldap_server_t server = iter.server;
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int tls_mode;
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if (server->starttls)
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tls_mode = 1;
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else if (server->ldap_over_tls)
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tls_mode = 2;
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else
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tls_mode = 0;
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err = run_ldap_wrapper (ctrl,
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0,
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0,
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tls_mode,
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server->ntds,
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opt.ldap_proxy,
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server->host, server->port,
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server->user, server->pass,
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dn,
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"(objectClass=*)",
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attr,
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reader);
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if (!err)
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break; /* Probably found a result. Ready. */
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}
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return err;
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}
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/* Return true if VALUE needs escaping. */
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static int
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rfc2254_need_escape (const char *value)
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{
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/* NUL needs to be escaped as well but we can represent that in
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* VALUE, so no need for it. */
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return !!strpbrk (value, "*()\\");
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}
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/* Escape VALUE using RFC-2254 rules. Returns NULL on error. */
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static char *
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rfc2254_escape (const char *value)
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{
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const char *s;
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char *buffer, *p;
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size_t length = 0;
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for (s=value; *s; s++)
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switch (*s)
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{
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case '*':
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case '(':
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case ')':
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case '\\': length += 3; break;
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default: length++; break;
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}
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buffer = xtrymalloc (length+1);
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if (!buffer)
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return NULL;
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p = buffer;
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for (s=value; *s; s++)
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switch (*s)
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{
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case '*': p = stpcpy (p, "\\2a"); break;
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case '(': p = stpcpy (p, "\\28"); break;
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case ')': p = stpcpy (p, "\\29"); break;
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case '\\': p = stpcpy (p, "\\5c"); break;
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default: *p++ = *s; break;
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}
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*p = 0;
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return buffer;
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}
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/* Return true if VALUE needs escaping. */
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static int
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extfilt_need_escape (const char *value)
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{
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/* NUL needs to be escaped as well but we can represent that in
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* VALUE, so no need for it. */
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return !!strchr (value, '&');
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}
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/* Escape VALUE using our extended filter rules from dirmngr_ldap.c.
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* Returns NULL on error. */
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static char *
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extfilt_escape (const char *value)
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{
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const char *s;
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char *buffer, *p;
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size_t length = 0;
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for (s=value; *s; s++)
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{
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length++;
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if (*s == '&')
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length++;
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}
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buffer = xtrymalloc (length+1);
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if (!buffer)
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return NULL;
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p = buffer;
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for (s=value; *s; s++)
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{
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*p++ = *s;
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if (*s == '&')
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*p++ = '&';
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}
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*p = 0;
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return buffer;
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}
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/* Parse PATTERN and return a new filter expression for an LDAP query.
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* The extended filter syntax as known by dirmngr_ldap.c is used.
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* Caller must release the returned value. R_RESULT is set to NULL on
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* error.
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*
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* Supported patterns:
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*
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* | Ok | gpg style user id type |
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* |-----+------------------------------------------------------|
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* | no | KeyID |
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* | no | Fingerprint |
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* | no | OpenPGP userid |
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* | yes | Email address Indicated by a left angle bracket. |
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* | no | Exact word match in user id or subj. name |
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* | yes | Subj. DN indicated by a leading slash |
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* | no | Issuer DN |
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* | no | Serial number + subj. DN |
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* | yes | Substring match indicated by a leading '*; (default) |
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*/
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static gpg_error_t
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make_one_filter (const char *pattern, char **r_result)
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{
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gpg_error_t err = 0;
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char *pattern_buffer = NULL;
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char *result = NULL;
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size_t n;
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*r_result = NULL;
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switch (*pattern)
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{
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case '<': /* Email. */
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{
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pattern++;
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if (rfc2254_need_escape (pattern)
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&& !(pattern = pattern_buffer = rfc2254_escape (pattern)))
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{
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err = gpg_error_from_syserror ();
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goto leave;
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}
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result = strconcat ("(mail=", pattern, ")", NULL);
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if (!result)
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{
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err = gpg_error_from_syserror ();
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goto leave;
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}
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n = strlen (result);
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if (result[n-2] == '>') /* Strip trailing '>' */
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{
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result[n-2] = ')';
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result[n-1] = 0;
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}
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break;
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}
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case '/': /* Subject DN. */
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pattern++;
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if (*pattern)
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{
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/* We need just the BaseDN. This assumes that the Subject
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* is correcly stored in the DT. This is however not always
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* the case and the actual DN is different ffrom the
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* subject. In this case we won't find anything. */
|
||
if (extfilt_need_escape (pattern)
|
||
&& !(pattern = pattern_buffer = extfilt_escape (pattern)))
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto leave;
|
||
}
|
||
result = strconcat ("^", pattern, "&base&", NULL);
|
||
if (!result)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto leave;
|
||
}
|
||
}
|
||
break;
|
||
case '#': /* Issuer DN - Not yet working. */
|
||
pattern++;
|
||
if (*pattern == '/') /* Just issuer DN. */
|
||
{
|
||
pattern++;
|
||
if (extfilt_need_escape (pattern)
|
||
&& !(pattern = pattern_buffer = extfilt_escape (pattern)))
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto leave;
|
||
}
|
||
result = strconcat ("^", pattern, "&base&", NULL);
|
||
if (!result)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto leave;
|
||
}
|
||
}
|
||
else /* Serial number + issuer DN */
|
||
{
|
||
|
||
}
|
||
break;
|
||
case '*':
|
||
pattern++;
|
||
/* fall through */
|
||
default: /* Take as substring match. */
|
||
if (*pattern)
|
||
{
|
||
if (rfc2254_need_escape (pattern)
|
||
&& !(pattern = pattern_buffer = rfc2254_escape (pattern)))
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto leave;
|
||
}
|
||
result = strconcat ("(|(sn=*", pattern,
|
||
"*)(|(cn=*", pattern,
|
||
"*)(mail=*", pattern,
|
||
"*)))", NULL);
|
||
if (!result)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto leave;
|
||
}
|
||
}
|
||
break;
|
||
}
|
||
|
||
if (!result)
|
||
err = gpg_error (GPG_ERR_INV_USER_ID);
|
||
|
||
leave:
|
||
xfree (pattern_buffer);
|
||
if (err)
|
||
xfree (result);
|
||
else
|
||
*r_result = result;
|
||
return err;
|
||
}
|
||
|
||
|
||
|
||
/* Prepare an LDAP query to return the cACertificate attribute for DN.
|
||
* All configured default servers are queried until one responds.
|
||
* This function returns an error code or 0 and stored a newly
|
||
* allocated contect object at CONTEXT on success. */
|
||
gpg_error_t
|
||
start_cacert_fetch_ldap (ctrl_t ctrl, cert_fetch_context_t *r_context,
|
||
const char *dn)
|
||
{
|
||
gpg_error_t err;
|
||
struct ldapserver_iter iter;
|
||
|
||
*r_context = xtrycalloc (1, sizeof **r_context);
|
||
if (!*r_context)
|
||
return gpg_error_from_errno (errno);
|
||
|
||
/* FIXME; we might want to look at the Base DN to try matching
|
||
servers first. */
|
||
err = gpg_error (GPG_ERR_CONFIGURATION);
|
||
|
||
for (ldapserver_iter_begin (&iter, ctrl); ! ldapserver_iter_end_p (&iter);
|
||
ldapserver_iter_next (&iter))
|
||
{
|
||
ldap_server_t server = iter.server;
|
||
|
||
err = run_ldap_wrapper (ctrl,
|
||
0,
|
||
1, /* --multi (record format) */
|
||
0, /* No TLS */
|
||
0, /* No AD authentication. */
|
||
opt.ldap_proxy,
|
||
server->host, server->port,
|
||
server->user, server->pass,
|
||
dn, "objectClass=*", "cACertificate",
|
||
&(*r_context)->reader);
|
||
if (!err)
|
||
break; /* Probably found a result. */
|
||
}
|
||
|
||
if (err)
|
||
{
|
||
xfree (*r_context);
|
||
*r_context = NULL;
|
||
}
|
||
return err;
|
||
}
|
||
|
||
|
||
/* Prepare an LDAP query to return certificates matching PATTERNS
|
||
* using the SERVER. This function returns an error code or 0 and
|
||
* stores a newly allocated object at R_CONTEXT on success. */
|
||
gpg_error_t
|
||
start_cert_fetch_ldap (ctrl_t ctrl, cert_fetch_context_t *r_context,
|
||
strlist_t patterns, const ldap_server_t server)
|
||
{
|
||
gpg_error_t err;
|
||
char *proxy = NULL;
|
||
char *host = NULL;
|
||
int port;
|
||
char *user = NULL;
|
||
char *pass = NULL;
|
||
char *base = NULL;
|
||
char *argv[50];
|
||
int argc = 0;
|
||
int argc_malloced = 0;
|
||
char portbuf[30], timeoutbuf[30];
|
||
int starttls, ldaptls, ntds;
|
||
|
||
*r_context = NULL;
|
||
|
||
if (opt.ldap_proxy && !(proxy = xtrystrdup (opt.ldap_proxy)))
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto leave;
|
||
}
|
||
|
||
if (server)
|
||
{
|
||
if (server->host && !(host = xtrystrdup (server->host)))
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto leave;
|
||
}
|
||
port = server->port;
|
||
if (server->user && !(user = xtrystrdup (server->user)))
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto leave;
|
||
}
|
||
if (server->pass && !(pass = xtrystrdup (server->pass)))
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto leave;
|
||
}
|
||
if (server->base && !(base = xtrystrdup (server->base)))
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto leave;
|
||
}
|
||
|
||
starttls = server->starttls;
|
||
ldaptls = server->ldap_over_tls;
|
||
ntds = server->ntds;
|
||
}
|
||
else /* Use a default server. */
|
||
{
|
||
err = gpg_error (GPG_ERR_NOT_IMPLEMENTED);
|
||
goto leave;
|
||
}
|
||
|
||
|
||
if (pass && *pass) /* Note: Must be the first item. */
|
||
{
|
||
argv[argc++] = "--pass";
|
||
argv[argc++] = pass;
|
||
}
|
||
|
||
if (DBG_LOOKUP)
|
||
argv[argc++] = "-vv";
|
||
else if (DBG_EXTPROG)
|
||
argv[argc++] = "-v";
|
||
|
||
argv[argc++] = "--log-with-pid";
|
||
argv[argc++] = "--multi";
|
||
|
||
if (starttls)
|
||
argv[argc++] = "--starttls";
|
||
else if (ldaptls)
|
||
argv[argc++] = "--ldaptls";
|
||
|
||
if (ntds)
|
||
argv[argc++] = "--ntds";
|
||
|
||
if (opt.ldaptimeout)
|
||
{
|
||
snprintf (timeoutbuf, sizeof timeoutbuf, "%u", opt.ldaptimeout);
|
||
argv[argc++] = "--timeout";
|
||
argv[argc++] = timeoutbuf;
|
||
}
|
||
if (proxy && *proxy)
|
||
{
|
||
argv[argc++] = "--proxy";
|
||
argv[argc++] = proxy;
|
||
}
|
||
if (host && *host)
|
||
{
|
||
argv[argc++] = "--host";
|
||
argv[argc++] = host;
|
||
}
|
||
if (port)
|
||
{
|
||
snprintf (portbuf, sizeof portbuf, "%d", port);
|
||
argv[argc++] = "--port";
|
||
argv[argc++] = portbuf;
|
||
}
|
||
if (user && *user)
|
||
{
|
||
argv[argc++] = "--user";
|
||
argv[argc++] = user;
|
||
}
|
||
if (base && *base)
|
||
{
|
||
argv[argc++] = "--base";
|
||
argv[argc++] = base;
|
||
}
|
||
|
||
|
||
/* All entries in argv from this index on are malloc'ed. */
|
||
argc_malloced = argc;
|
||
|
||
for (; patterns; patterns = patterns->next)
|
||
{
|
||
if (argc >= DIM (argv) - 1)
|
||
{
|
||
/* Too many patterns. It does not make sense to allow an
|
||
arbitrary number of patters because the length of the
|
||
command line is limited anyway. */
|
||
err = gpg_error (GPG_ERR_RESOURCE_LIMIT);
|
||
goto leave;
|
||
}
|
||
if (*patterns->d)
|
||
{
|
||
err = make_one_filter (patterns->d, &argv[argc]);
|
||
if (err)
|
||
goto leave;
|
||
argc++;
|
||
}
|
||
}
|
||
argv[argc] = NULL;
|
||
|
||
*r_context = xtrycalloc (1, sizeof **r_context);
|
||
if (!*r_context)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto leave;
|
||
}
|
||
|
||
err = ldap_wrapper (ctrl, &(*r_context)->reader, (const char**)argv);
|
||
if (err)
|
||
{
|
||
xfree (*r_context);
|
||
*r_context = NULL;
|
||
}
|
||
|
||
leave:
|
||
for (; argc_malloced < argc; argc_malloced++)
|
||
xfree (argv[argc_malloced]);
|
||
xfree (proxy);
|
||
xfree (host);
|
||
xfree (base);
|
||
xfree (user);
|
||
xfree (pass);
|
||
return err;
|
||
}
|
||
|
||
|
||
/* Read a fixed amount of data from READER into BUFFER. */
|
||
static gpg_error_t
|
||
read_buffer (ksba_reader_t reader, unsigned char *buffer, size_t count)
|
||
{
|
||
gpg_error_t err;
|
||
size_t nread;
|
||
|
||
while (count)
|
||
{
|
||
err = ksba_reader_read (reader, buffer, count, &nread);
|
||
if (err)
|
||
return err;
|
||
buffer += nread;
|
||
count -= nread;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
|
||
/* Fetch the next certificate. Return 0 on success, GPG_ERR_EOF if no
|
||
(more) certificates are available or any other error
|
||
code. GPG_ERR_TRUNCATED may be returned to indicate that the result
|
||
has been truncated. */
|
||
gpg_error_t
|
||
fetch_next_cert_ldap (cert_fetch_context_t context,
|
||
unsigned char **value, size_t *valuelen)
|
||
{
|
||
gpg_error_t err;
|
||
unsigned char hdr[5];
|
||
char *p, *pend;
|
||
unsigned long n;
|
||
int okay = 0;
|
||
/* int is_cms = 0; */
|
||
|
||
*value = NULL;
|
||
*valuelen = 0;
|
||
|
||
err = 0;
|
||
while (!err)
|
||
{
|
||
err = read_buffer (context->reader, hdr, 5);
|
||
if (err)
|
||
break;
|
||
n = buf32_to_ulong (hdr+1);
|
||
if (*hdr == 'V' && okay)
|
||
{
|
||
#if 0 /* That code to extra a cert from a CMS object is not yet ready. */
|
||
if (is_cms)
|
||
{
|
||
/* The certificate needs to be parsed from CMS data. */
|
||
ksba_cms_t cms;
|
||
ksba_stop_reason_t stopreason;
|
||
int i;
|
||
|
||
err = ksba_cms_new (&cms);
|
||
if (err)
|
||
goto leave;
|
||
err = ksba_cms_set_reader_writer (cms, context->reader, NULL);
|
||
if (err)
|
||
{
|
||
log_error ("ksba_cms_set_reader_writer failed: %s\n",
|
||
gpg_strerror (err));
|
||
goto leave;
|
||
}
|
||
|
||
do
|
||
{
|
||
err = ksba_cms_parse (cms, &stopreason);
|
||
if (err)
|
||
{
|
||
log_error ("ksba_cms_parse failed: %s\n",
|
||
gpg_strerror (err));
|
||
goto leave;
|
||
}
|
||
|
||
if (stopreason == KSBA_SR_BEGIN_DATA)
|
||
log_error ("userSMIMECertificate is not "
|
||
"a certs-only message\n");
|
||
}
|
||
while (stopreason != KSBA_SR_READY);
|
||
|
||
for (i=0; (cert=ksba_cms_get_cert (cms, i)); i++)
|
||
{
|
||
check_and_store (ctrl, stats, cert, 0);
|
||
ksba_cert_release (cert);
|
||
cert = NULL;
|
||
}
|
||
if (!i)
|
||
log_error ("no certificate found\n");
|
||
else
|
||
any = 1;
|
||
}
|
||
else
|
||
#endif /* End unfinished code to extract from a CMS object. */
|
||
{
|
||
*value = xtrymalloc (n);
|
||
if (!*value)
|
||
return gpg_error_from_errno (errno);
|
||
*valuelen = n;
|
||
err = read_buffer (context->reader, *value, n);
|
||
break; /* Ready or error. */
|
||
}
|
||
}
|
||
else if (!n && *hdr == 'A')
|
||
okay = 0;
|
||
else if (n)
|
||
{
|
||
if (n > context->tmpbufsize)
|
||
{
|
||
xfree (context->tmpbuf);
|
||
context->tmpbufsize = 0;
|
||
context->tmpbuf = xtrymalloc (n+1);
|
||
if (!context->tmpbuf)
|
||
return gpg_error_from_errno (errno);
|
||
context->tmpbufsize = n;
|
||
}
|
||
err = read_buffer (context->reader, context->tmpbuf, n);
|
||
if (err)
|
||
break;
|
||
if (*hdr == 'A')
|
||
{
|
||
p = context->tmpbuf;
|
||
p[n] = 0; /*(we allocated one extra byte for this.)*/
|
||
/* fixme: is_cms = 0; */
|
||
if ( (pend = strchr (p, ';')) )
|
||
*pend = 0; /* Strip off the extension. */
|
||
if (!ascii_strcasecmp (p, USERCERTIFICATE))
|
||
{
|
||
if (DBG_LOOKUP)
|
||
log_debug ("fetch_next_cert_ldap: got attribute '%s'\n",
|
||
USERCERTIFICATE);
|
||
okay = 1;
|
||
}
|
||
else if (!ascii_strcasecmp (p, CACERTIFICATE))
|
||
{
|
||
if (DBG_LOOKUP)
|
||
log_debug ("fetch_next_cert_ldap: got attribute '%s'\n",
|
||
CACERTIFICATE);
|
||
okay = 1;
|
||
}
|
||
else if (!ascii_strcasecmp (p, X509CACERT))
|
||
{
|
||
if (DBG_LOOKUP)
|
||
log_debug ("fetch_next_cert_ldap: got attribute '%s'\n",
|
||
CACERTIFICATE);
|
||
okay = 1;
|
||
}
|
||
/* else if (!ascii_strcasecmp (p, USERSMIMECERTIFICATE)) */
|
||
/* { */
|
||
/* if (DBG_LOOKUP) */
|
||
/* log_debug ("fetch_next_cert_ldap: got attribute '%s'\n", */
|
||
/* USERSMIMECERTIFICATE); */
|
||
/* okay = 1; */
|
||
/* is_cms = 1; */
|
||
/* } */
|
||
else
|
||
{
|
||
if (DBG_LOOKUP)
|
||
log_debug ("fetch_next_cert_ldap: got attribute '%s'"
|
||
" - ignored\n", p);
|
||
okay = 0;
|
||
}
|
||
}
|
||
else if (*hdr == 'E')
|
||
{
|
||
p = context->tmpbuf;
|
||
p[n] = 0; /*(we allocated one extra byte for this.)*/
|
||
if (!strcmp (p, "truncated"))
|
||
{
|
||
context->truncated = 1;
|
||
log_info (_("ldap_search hit the size limit of"
|
||
" the server\n"));
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
if (err)
|
||
{
|
||
xfree (*value);
|
||
*value = NULL;
|
||
*valuelen = 0;
|
||
if (gpg_err_code (err) == GPG_ERR_EOF && context->truncated)
|
||
{
|
||
context->truncated = 0; /* So that the next call would return EOF. */
|
||
err = gpg_error (GPG_ERR_TRUNCATED);
|
||
}
|
||
}
|
||
|
||
return err;
|
||
}
|
||
|
||
|
||
void
|
||
end_cert_fetch_ldap (cert_fetch_context_t context)
|
||
{
|
||
if (context)
|
||
{
|
||
ksba_reader_t reader = context->reader;
|
||
|
||
xfree (context->tmpbuf);
|
||
xfree (context);
|
||
ldap_wrapper_release_context (reader);
|
||
ksba_reader_release (reader);
|
||
}
|
||
}
|